Come up with sillier names for the binaries

I'm not entirely sure, but it looks like some people might not like
jokes about the Holocaust.

On a more serious note, the project has become more serious over
the 7 or so years of its existence.

1 files changed, 0 insertions, 4079 deletions

diff --git a/kike.c b/kike.c
deleted file mode 100644
index e805e00..0000000
--- a/kike.c
+++ /dev/null
@@ -1,4079 +0,0 @@
-/*
- * kike.c: an IRC daemon
- *
- * Copyright (c) 2014 - 2020, Přemysl Eric Janouch <p@janouch.name>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-
-#include "config.h"
-#define PROGRAM_NAME "kike"
-
-#define WANT_SYSLOG_LOGGING
-#include "common.c"
-#include "kike-replies.c"
-#include <nl_types.h>
-
-enum { PIPE_READ, PIPE_WRITE };
-
-// FIXME: don't use time_t to compute time deltas
-
-// --- Configuration (application-specific) ------------------------------------
-
-// Just get rid of the crappiest ciphers available by default
-#define DEFAULT_CIPHERS "DEFAULT:!MEDIUM:!LOW"
-
-static struct simple_config_item g_config_table[] =
-{
-	{ "pid_file",        NULL,              "Path or name of the PID file"   },
-	{ "server_name",     NULL,              "Server name"                    },
-	{ "server_info",     "My server",       "Brief server description"       },
-	{ "motd",            NULL,              "MOTD filename"                  },
-	{ "catalog",         NULL,              "catgets localization catalog"   },
-
-	{ "bind_host",       NULL,              "Address of the IRC server"      },
-	{ "bind_port",       "6667",            "Port of the IRC server"         },
-	{ "tls_cert",        NULL,              "Server TLS certificate (PEM)"   },
-	{ "tls_key",         NULL,              "Server TLS private key (PEM)"   },
-	{ "tls_ciphers",     DEFAULT_CIPHERS,   "OpenSSL cipher list"            },
-
-	{ "operators",       NULL, "IRCop TLS client cert. SHA-1 fingerprints"   },
-
-	{ "max_connections", "0",               "Global connection limit"        },
-	{ "ping_interval",   "180",             "Interval between PINGs (sec)"   },
-	{ NULL,              NULL,              NULL                             }
-};
-
-// --- Signals -----------------------------------------------------------------
-
-static int g_signal_pipe[2];            ///< A pipe used to signal... signals
-
-/// Program termination has been requested by a signal
-static volatile sig_atomic_t g_termination_requested;
-
-static void
-sigterm_handler (int signum)
-{
-	(void) signum;
-
-	g_termination_requested = true;
-
-	int original_errno = errno;
-	if (write (g_signal_pipe[1], "t", 1) == -1)
-		soft_assert (errno == EAGAIN);
-	errno = original_errno;
-}
-
-static void
-setup_signal_handlers (void)
-{
-	if (pipe (g_signal_pipe) == -1)
-		exit_fatal ("%s: %s", "pipe", strerror (errno));
-
-	set_cloexec (g_signal_pipe[0]);
-	set_cloexec (g_signal_pipe[1]);
-
-	// So that the pipe cannot overflow; it would make write() block within
-	// the signal handler, which is something we really don't want to happen.
-	// The same holds true for read().
-	set_blocking (g_signal_pipe[0], false);
-	set_blocking (g_signal_pipe[1], false);
-
-	signal (SIGPIPE, SIG_IGN);
-
-	struct sigaction sa;
-	sa.sa_flags = SA_RESTART;
-	sigemptyset (&sa.sa_mask);
-	sa.sa_handler = sigterm_handler;
-	if (sigaction (SIGINT, &sa, NULL) == -1
-	 || sigaction (SIGTERM, &sa, NULL) == -1)
-		exit_fatal ("%s: %s", "sigaction", strerror (errno));
-}
-
-// --- Rate limiter ------------------------------------------------------------
-
-struct flood_detector
-{
-	unsigned interval;                  ///< Interval for the limit
-	unsigned limit;                     ///< Maximum number of events allowed
-
-	time_t *timestamps;                 ///< Timestamps of last events
-	unsigned pos;                       ///< Index of the oldest event
-};
-
-static void
-flood_detector_init (struct flood_detector *self,
-	unsigned interval, unsigned limit)
-{
-	self->interval = interval;
-	self->limit = limit;
-	self->timestamps = xcalloc (limit + 1, sizeof *self->timestamps);
-	self->pos = 0;
-}
-
-static void
-flood_detector_free (struct flood_detector *self)
-{
-	free (self->timestamps);
-}
-
-static bool
-flood_detector_check (struct flood_detector *self)
-{
-	time_t now = time (NULL);
-	self->timestamps[self->pos++] = now;
-	if (self->pos > self->limit)
-		self->pos = 0;
-
-	time_t begin = now - self->interval;
-	size_t count = 0;
-	for (size_t i = 0; i <= self->limit; i++)
-		if (self->timestamps[i] >= begin)
-			count++;
-	return count <= self->limit;
-}
-
-// --- IRC token validation ----------------------------------------------------
-
-// Use the enum only if applicable and a simple boolean isn't sufficient.
-
-enum validation_result
-{
-	VALIDATION_OK,
-	VALIDATION_ERROR_EMPTY,
-	VALIDATION_ERROR_TOO_LONG,
-	VALIDATION_ERROR_INVALID
-};
-
-// Everything as per RFC 2812
-#define IRC_MAX_NICKNAME          9
-#define IRC_MAX_HOSTNAME         63
-#define IRC_MAX_CHANNEL_NAME     50
-#define IRC_MAX_MESSAGE_LENGTH  510
-
-static bool
-irc_regex_match (const char *regex, const char *s)
-{
-	static struct str_map cache;
-	static bool initialized;
-
-	if (!initialized)
-	{
-		cache = regex_cache_make ();
-		initialized = true;
-	}
-
-	struct error *e = NULL;
-	bool result = regex_cache_match (&cache, regex,
-		REG_EXTENDED | REG_NOSUB, s, &e);
-	hard_assert (!e);
-	return result;
-}
-
-static const char *
-irc_validate_to_str (enum validation_result result)
-{
-	switch (result)
-	{
-	case VALIDATION_OK:              return "success";
-	case VALIDATION_ERROR_EMPTY:     return "the value is empty";
-	case VALIDATION_ERROR_INVALID:   return "invalid format";
-	case VALIDATION_ERROR_TOO_LONG:  return "the value is too long";
-	default:                         abort ();
-	}
-}
-
-// Anything to keep it as short as possible
-// "shortname" from RFC 2812 doesn't work how its author thought it would.
-#define SN "[0-9A-Za-z](-*[0-9A-Za-z])*"
-#define N4 "[0-9]{1,3}"
-#define N6 "[0-9ABCDEFabcdef]{1,}"
-
-#define LE "A-Za-z"
-#define SP "][\\\\`_^{|}"
-
-static enum validation_result
-irc_validate_hostname (const char *hostname)
-{
-	if (!*hostname)
-		return VALIDATION_ERROR_EMPTY;
-	if (!irc_regex_match ("^" SN "(\\." SN ")*$", hostname))
-		return VALIDATION_ERROR_INVALID;
-	if (strlen (hostname) > IRC_MAX_HOSTNAME)
-		return VALIDATION_ERROR_TOO_LONG;
-	return VALIDATION_OK;
-}
-
-static bool
-irc_is_valid_hostaddr (const char *hostaddr)
-{
-	if (irc_regex_match ("^" N4 "\\." N4 "\\." N4 "\\." N4 "$", hostaddr)
-	 || irc_regex_match ("^" N6 ":" N6 ":" N6 ":" N6 ":"
-		N6 ":" N6 ":" N6 ":" N6 "$", hostaddr)
-	 || irc_regex_match ("^0:0:0:0:0:(0|[Ff]{4}):"
-		N4 "\\." N4 "\\." N4 "\\." N4 "$", hostaddr))
-		return true;
-	return false;
-}
-
-// TODO: we should actually use this, though what should we do on failure?
-static bool
-irc_is_valid_host (const char *host)
-{
-	return irc_validate_hostname (host) == VALIDATION_OK
-		|| irc_is_valid_hostaddr (host);
-}
-
-// TODO: currently, we are almost encoding-agnostic (strings just need to be
-// ASCII-compatible).  We should at least have an option to enforce a specific
-// encoding, such as UTF-8.  Note that with Unicode we should not allow all
-// character clasess and exclude the likes of \pM with the goal of enforcing
-// NFC-normalized identifiers--utf8proc is a good candidate library to handle
-// the categorization and validation.
-
-static bool
-irc_is_valid_user (const char *user)
-{
-	return irc_regex_match ("^[^\r\n @]+$", user);
-}
-
-static bool
-irc_validate_nickname (const char *nickname)
-{
-	if (!*nickname)
-		return VALIDATION_ERROR_EMPTY;
-	if (!irc_regex_match ("^[" SP LE "][" SP LE "0-9-]*$", nickname))
-		return VALIDATION_ERROR_INVALID;
-	if (strlen (nickname) > IRC_MAX_NICKNAME)
-		return VALIDATION_ERROR_TOO_LONG;
-	return VALIDATION_OK;
-}
-
-static enum validation_result
-irc_validate_channel_name (const char *channel_name)
-{
-	if (!*channel_name)
-		return VALIDATION_ERROR_EMPTY;
-	if (*channel_name != '#' || strpbrk (channel_name, "\7\r\n ,:"))
-		return VALIDATION_ERROR_INVALID;
-	if (strlen (channel_name) > IRC_MAX_CHANNEL_NAME)
-		return VALIDATION_ERROR_TOO_LONG;
-	return VALIDATION_OK;
-}
-
-static bool
-irc_is_valid_key (const char *key)
-{
-	// XXX: should be 7-bit as well but whatever
-	return irc_regex_match ("^[^\r\n\f\t\v ]{1,23}$", key);
-}
-
-#undef SN
-#undef N4
-#undef N6
-
-#undef LE
-#undef SP
-
-static bool
-irc_is_valid_user_mask (const char *mask)
-{
-	return irc_regex_match ("^[^!@]+![^!@]+@[^@!]+$", mask);
-}
-
-static bool
-irc_is_valid_fingerprint (const char *fp)
-{
-	return irc_regex_match ("^[a-fA-F0-9]{40}$", fp);
-}
-
-// --- Clients (equals users) --------------------------------------------------
-
-#define IRC_SUPPORTED_USER_MODES "aiwros"
-
-enum
-{
-	IRC_USER_MODE_INVISIBLE          = (1 << 0),
-	IRC_USER_MODE_RX_WALLOPS         = (1 << 1),
-	IRC_USER_MODE_RESTRICTED         = (1 << 2),
-	IRC_USER_MODE_OPERATOR           = (1 << 3),
-	IRC_USER_MODE_RX_SERVER_NOTICES  = (1 << 4)
-};
-
-enum
-{
-	IRC_CAP_MULTI_PREFIX             = (1 << 0),
-	IRC_CAP_INVITE_NOTIFY            = (1 << 1),
-	IRC_CAP_ECHO_MESSAGE             = (1 << 2),
-	IRC_CAP_USERHOST_IN_NAMES        = (1 << 3),
-	IRC_CAP_SERVER_TIME              = (1 << 4)
-};
-
-struct client
-{
-	LIST_HEADER (struct client)
-	struct server_context *ctx;         ///< Server context
-
-	time_t opened;                      ///< When the connection was opened
-	size_t n_sent_messages;             ///< Number of sent messages total
-	size_t sent_bytes;                  ///< Number of sent bytes total
-	size_t n_received_messages;         ///< Number of received messages total
-	size_t received_bytes;              ///< Number of received bytes total
-
-	int socket_fd;                      ///< The TCP socket
-	struct str read_buffer;             ///< Unprocessed input
-	struct str write_buffer;            ///< Output yet to be sent out
-
-	struct poller_fd socket_event;      ///< The socket can be read/written to
-	struct poller_timer ping_timer;     ///< We should send a ping
-	struct poller_timer timeout_timer;  ///< Connection seems to be dead
-	struct poller_timer kill_timer;     ///< Hard kill timeout
-
-	unsigned long cap_version;          ///< CAP protocol version
-	unsigned caps_enabled;              ///< Enabled capabilities
-
-	unsigned initialized     : 1;       ///< Has any data been received yet?
-	unsigned cap_negotiating : 1;       ///< Negotiating capabilities
-	unsigned registered      : 1;       ///< The user has registered
-	unsigned closing_link    : 1;       ///< Closing link
-	unsigned half_closed     : 1;       ///< Closing link: conn. is half-closed
-
-	unsigned ssl_rx_want_tx  : 1;       ///< SSL_read() wants to write
-	unsigned ssl_tx_want_rx  : 1;       ///< SSL_write() wants to read
-	SSL *ssl;                           ///< SSL connection
-	char *ssl_cert_fingerprint;         ///< Client certificate fingerprint
-
-	char *nickname;                     ///< IRC nickname (main identifier)
-	char *username;                     ///< IRC username
-	char *realname;                     ///< IRC realname (e-mail)
-
-	char *hostname;                     ///< Hostname shown to the network
-	char *port;                         ///< Port of the peer as a string
-	char *address;                      ///< Full address
-
-	unsigned mode;                      ///< User's mode
-	char *away_message;                 ///< Away message
-	time_t last_active;                 ///< Last PRIVMSG, to get idle time
-	struct str_map invites;             ///< Channel invitations by operators
-	struct flood_detector antiflood;    ///< Flood detector
-
-	struct async_getnameinfo *gni;      ///< Backwards DNS resolution
-	struct poller_timer gni_timer;      ///< Backwards DNS resolution timeout
-};
-
-static struct client *
-client_new (void)
-{
-	struct client *self = xcalloc (1, sizeof *self);
-	self->socket_fd = -1;
-	self->read_buffer = str_make ();
-	self->write_buffer = str_make ();
-	self->cap_version = 301;
-	// TODO: make this configurable and more fine-grained
-	flood_detector_init (&self->antiflood, 10, 20);
-	self->invites = str_map_make (NULL);
-	self->invites.key_xfrm = irc_strxfrm;
-	return self;
-}
-
-static void
-client_destroy (struct client *self)
-{
-	if (!soft_assert (self->socket_fd == -1))
-		xclose (self->socket_fd);
-	if (self->ssl)
-		SSL_free (self->ssl);
-
-	str_free (&self->read_buffer);
-	str_free (&self->write_buffer);
-	free (self->ssl_cert_fingerprint);
-
-	free (self->nickname);
-	free (self->username);
-	free (self->realname);
-
-	free (self->hostname);
-	free (self->port);
-	free (self->address);
-
-	free (self->away_message);
-	flood_detector_free (&self->antiflood);
-	str_map_free (&self->invites);
-
-	if (self->gni)
-		async_cancel (&self->gni->async);
-	free (self);
-}
-
-static void client_close_link (struct client *c, const char *reason);
-static void client_kill (struct client *c, const char *reason);
-static void client_send (struct client *, const char *, ...)
-	ATTRIBUTE_PRINTF (2, 3);
-static void client_cancel_timers (struct client *);
-static void client_set_kill_timer (struct client *);
-static void client_update_poller (struct client *, const struct pollfd *);
-
-// --- Channels ----------------------------------------------------------------
-
-#define IRC_SUPPORTED_CHAN_MODES "ov" "beI" "imnqpst" "kl"
-
-enum
-{
-	IRC_CHAN_MODE_INVITE_ONLY      = (1 << 0),
-	IRC_CHAN_MODE_MODERATED        = (1 << 1),
-	IRC_CHAN_MODE_NO_OUTSIDE_MSGS  = (1 << 2),
-	IRC_CHAN_MODE_QUIET            = (1 << 3),
-	IRC_CHAN_MODE_PRIVATE          = (1 << 4),
-	IRC_CHAN_MODE_SECRET           = (1 << 5),
-	IRC_CHAN_MODE_PROTECTED_TOPIC  = (1 << 6),
-
-	IRC_CHAN_MODE_OPERATOR         = (1 << 7),
-	IRC_CHAN_MODE_VOICE            = (1 << 8)
-};
-
-struct channel_user
-{
-	LIST_HEADER (struct channel_user)
-
-	unsigned modes;
-	struct client *c;
-};
-
-struct channel
-{
-	struct server_context *ctx;         ///< Server context
-
-	char *name;                         ///< Channel name
-	unsigned modes;                     ///< Channel modes
-	char *key;                          ///< Channel key
-	long user_limit;                    ///< User limit or -1
-	time_t created;                     ///< Creation time
-
-	char *topic;                        ///< Channel topic
-	char *topic_who;                    ///< Who set the topic
-	time_t topic_time;                  ///< When the topic was set
-
-	struct channel_user *users;         ///< Channel users
-
-	struct strv ban_list;               ///< Ban list
-	struct strv exception_list;         ///< Exceptions from bans
-	struct strv invite_list;            ///< Exceptions from +I
-};
-
-static struct channel *
-channel_new (void)
-{
-	struct channel *self = xcalloc (1, sizeof *self);
-
-	self->user_limit = -1;
-	self->topic = xstrdup ("");
-
-	self->ban_list = strv_make ();
-	self->exception_list = strv_make ();
-	self->invite_list = strv_make ();
-	return self;
-}
-
-static void
-channel_delete (struct channel *self)
-{
-	free (self->name);
-	free (self->key);
-	free (self->topic);
-	free (self->topic_who);
-
-	struct channel_user *link, *tmp;
-	for (link = self->users; link; link = tmp)
-	{
-		tmp = link->next;
-		free (link);
-	}
-
-	strv_free (&self->ban_list);
-	strv_free (&self->exception_list);
-	strv_free (&self->invite_list);
-
-	free (self);
-}
-
-static char *
-channel_get_mode (struct channel *self, bool disclose_secrets)
-{
-	struct str mode = str_make ();
-	unsigned m = self->modes;
-	if (m & IRC_CHAN_MODE_INVITE_ONLY)      str_append_c (&mode, 'i');
-	if (m & IRC_CHAN_MODE_MODERATED)        str_append_c (&mode, 'm');
-	if (m & IRC_CHAN_MODE_NO_OUTSIDE_MSGS)  str_append_c (&mode, 'n');
-	if (m & IRC_CHAN_MODE_QUIET)            str_append_c (&mode, 'q');
-	if (m & IRC_CHAN_MODE_PRIVATE)          str_append_c (&mode, 'p');
-	if (m & IRC_CHAN_MODE_SECRET)           str_append_c (&mode, 's');
-	if (m & IRC_CHAN_MODE_PROTECTED_TOPIC)  str_append_c (&mode, 't');
-
-	if (self->user_limit != -1)             str_append_c (&mode, 'l');
-	if (self->key)                          str_append_c (&mode, 'k');
-
-	// XXX: is it correct to split it?  Try it on an existing implementation.
-	if (disclose_secrets)
-	{
-		if (self->user_limit != -1)
-			str_append_printf (&mode, " %ld", self->user_limit);
-		if (self->key)
-			str_append_printf (&mode, " %s", self->key);
-	}
-	return str_steal (&mode);
-}
-
-static struct channel_user *
-channel_get_user (const struct channel *chan, const struct client *c)
-{
-	for (struct channel_user *iter = chan->users; iter; iter = iter->next)
-		if (iter->c == c)
-			return iter;
-	return NULL;
-}
-
-static struct channel_user *
-channel_add_user (struct channel *chan, struct client *c)
-{
-	struct channel_user *link = xcalloc (1, sizeof *link);
-	link->c = c;
-	LIST_PREPEND (chan->users, link);
-	return link;
-}
-
-static void
-channel_remove_user (struct channel *chan, struct channel_user *user)
-{
-	LIST_UNLINK (chan->users, user);
-	free (user);
-}
-
-static size_t
-channel_user_count (const struct channel *chan)
-{
-	size_t result = 0;
-	for (struct channel_user *iter = chan->users; iter; iter = iter->next)
-		result++;
-	return result;
-}
-
-// --- IRC server context ------------------------------------------------------
-
-struct whowas_info
-{
-	char *nickname;                     ///< IRC nickname
-	char *username;                     ///< IRC username
-	char *realname;                     ///< IRC realname
-	char *hostname;                     ///< Hostname shown to the network
-};
-
-struct whowas_info *
-whowas_info_new (struct client *c)
-{
-	struct whowas_info *self = xmalloc (sizeof *self);
-	self->nickname = xstrdup (c->nickname);
-	self->username = xstrdup (c->username);
-	self->realname = xstrdup (c->realname);
-	self->hostname = xstrdup (c->hostname);
-	return self;
-}
-
-static void
-whowas_info_destroy (struct whowas_info *self)
-{
-	free (self->nickname);
-	free (self->username);
-	free (self->realname);
-	free (self->hostname);
-	free (self);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-struct irc_command
-{
-	const char *name;
-	bool requires_registration;
-	void (*handler) (const struct irc_message *, struct client *);
-
-	size_t n_received;                  ///< Number of commands received
-	size_t bytes_received;              ///< Number of bytes received total
-};
-
-struct server_context
-{
-	int *listen_fds;                    ///< Listening socket FD's
-	struct poller_fd *listen_events;    ///< New connections available
-	size_t listen_len;                  ///< Number of listening sockets
-	size_t listen_alloc;                ///< How many we've allocated
-
-	time_t started;                     ///< When has the server been started
-
-	SSL_CTX *ssl_ctx;                   ///< SSL context
-	struct client *clients;             ///< Clients
-	unsigned n_clients;                 ///< Current number of connections
-
-	struct str_map users;               ///< Maps nicknames to clients
-	struct str_map channels;            ///< Maps channel names to data
-	struct str_map handlers;            ///< Message handlers
-	struct str_map cap_handlers;        ///< CAP message handlers
-
-	struct str_map whowas;              ///< WHOWAS registry
-
-	struct poller poller;               ///< Manages polled description
-	struct poller_timer quit_timer;     ///< Quit timeout timer
-	bool quitting;                      ///< User requested quitting
-	bool polling;                       ///< The event loop is running
-
-	struct poller_fd signal_event;      ///< Got a signal
-
-	struct str_map config;              ///< Server configuration
-	char *server_name;                  ///< Our server name
-	unsigned ping_interval;             ///< Ping interval in seconds
-	unsigned max_connections;           ///< Max. connections allowed or 0
-	struct strv motd;                   ///< MOTD (none if empty)
-	nl_catd catalog;                    ///< Message catalog for server msgs
-	struct str_map operators;           ///< TLS cert. fingerprints for IRCops
-};
-
-static void
-on_irc_quit_timeout (void *user_data)
-{
-	struct server_context *ctx = user_data;
-	struct client *iter, *next;
-	for (iter = ctx->clients; iter; iter = next)
-	{
-		next = iter->next;
-		// irc_initiate_quit() has already unregistered the client
-		client_kill (iter, "Shutting down");
-	}
-}
-
-static void
-server_context_init (struct server_context *self)
-{
-	memset (self, 0, sizeof *self);
-
-	self->users = str_map_make (NULL);
-	self->users.key_xfrm = irc_strxfrm;
-	self->channels = str_map_make ((str_map_free_fn) channel_delete);
-	self->channels.key_xfrm = irc_strxfrm;
-	self->handlers = str_map_make (NULL);
-	self->handlers.key_xfrm = irc_strxfrm;
-	self->cap_handlers = str_map_make (NULL);
-	self->cap_handlers.key_xfrm = irc_strxfrm;
-
-	self->whowas = str_map_make ((str_map_free_fn) whowas_info_destroy);
-	self->whowas.key_xfrm = irc_strxfrm;
-
-	poller_init (&self->poller);
-	self->quit_timer = poller_timer_make (&self->poller);
-	self->quit_timer.dispatcher = on_irc_quit_timeout;
-	self->quit_timer.user_data = self;
-
-	self->config = str_map_make (free);
-	simple_config_load_defaults (&self->config, g_config_table);
-
-	self->motd = strv_make ();
-	self->catalog = (nl_catd) -1;
-	self->operators = str_map_make (NULL);
-	// The regular irc_strxfrm() is sufficient for fingerprints
-	self->operators.key_xfrm = irc_strxfrm;
-}
-
-static void
-server_context_free (struct server_context *self)
-{
-	str_map_free (&self->config);
-
-	for (size_t i = 0; i < self->listen_len; i++)
-	{
-		poller_fd_reset (&self->listen_events[i]);
-		xclose (self->listen_fds[i]);
-	}
-	free (self->listen_fds);
-	free (self->listen_events);
-
-	hard_assert (!self->clients);
-	if (self->ssl_ctx)
-		SSL_CTX_free (self->ssl_ctx);
-
-	free (self->server_name);
-	str_map_free (&self->users);
-	str_map_free (&self->channels);
-	str_map_free (&self->handlers);
-	str_map_free (&self->cap_handlers);
-	str_map_free (&self->whowas);
-	poller_free (&self->poller);
-
-	strv_free (&self->motd);
-	if (self->catalog != (nl_catd) -1)
-		catclose (self->catalog);
-	str_map_free (&self->operators);
-}
-
-static const char *
-irc_get_text (struct server_context *ctx, int id, const char *def)
-{
-	if (!soft_assert (def != NULL))
-		def = "";
-	if (ctx->catalog == (nl_catd) -1)
-		return def;
-	return catgets (ctx->catalog, 1, id, def);
-}
-
-static void
-irc_try_finish_quit (struct server_context *ctx)
-{
-	if (!ctx->n_clients && ctx->quitting)
-	{
-		poller_timer_reset (&ctx->quit_timer);
-		ctx->polling = false;
-	}
-}
-
-static void
-irc_initiate_quit (struct server_context *ctx)
-{
-	print_status ("shutting down");
-
-	for (size_t i = 0; i < ctx->listen_len; i++)
-	{
-		poller_fd_reset (&ctx->listen_events[i]);
-		xclose (ctx->listen_fds[i]);
-	}
-	ctx->listen_len = 0;
-
-	for (struct client *iter = ctx->clients; iter; iter = iter->next)
-		if (!iter->closing_link)
-			client_close_link (iter, "Shutting down");
-
-	ctx->quitting = true;
-	poller_timer_set (&ctx->quit_timer, 5000);
-	irc_try_finish_quit (ctx);
-}
-
-static struct channel *
-irc_channel_create (struct server_context *ctx, const char *name)
-{
-	struct channel *chan = channel_new ();
-	chan->ctx = ctx;
-	chan->name = xstrdup (name);
-	chan->created = time (NULL);
-	str_map_set (&ctx->channels, name, chan);
-	return chan;
-}
-
-static void
-irc_channel_destroy_if_empty (struct server_context *ctx, struct channel *chan)
-{
-	if (!chan->users)
-		str_map_set (&ctx->channels, chan->name, NULL);
-}
-
-static void
-irc_send_to_roommates (struct client *c, const char *message)
-{
-	struct str_map targets = str_map_make (NULL);
-	targets.key_xfrm = irc_strxfrm;
-
-	struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
-	struct channel *chan;
-	while ((chan = str_map_iter_next (&iter)))
-	{
-		if (chan->modes & IRC_CHAN_MODE_QUIET
-		 || !channel_get_user (chan, c))
-			continue;
-		for (struct channel_user *iter = chan->users; iter; iter = iter->next)
-			str_map_set (&targets, iter->c->nickname, iter->c);
-	}
-
-	iter = str_map_iter_make (&targets);
-	struct client *target;
-	while ((target = str_map_iter_next (&iter)))
-		if (target != c)
-			client_send (target, "%s", message);
-	str_map_free (&targets);
-}
-
-// --- Clients (continued) -----------------------------------------------------
-
-static void
-client_mode_to_str (unsigned m, struct str *out)
-{
-	if (m & IRC_USER_MODE_INVISIBLE)           str_append_c (out, 'i');
-	if (m & IRC_USER_MODE_RX_WALLOPS)          str_append_c (out, 'w');
-	if (m & IRC_USER_MODE_RESTRICTED)          str_append_c (out, 'r');
-	if (m & IRC_USER_MODE_OPERATOR)            str_append_c (out, 'o');
-	if (m & IRC_USER_MODE_RX_SERVER_NOTICES)   str_append_c (out, 's');
-}
-
-static char *
-client_get_mode (struct client *self)
-{
-	struct str mode = str_make ();
-	if (self->away_message)
-		str_append_c (&mode, 'a');
-	client_mode_to_str (self->mode, &mode);
-	return str_steal (&mode);
-}
-
-static void
-client_send_str (struct client *c, const struct str *s)
-{
-	hard_assert (!c->closing_link);
-
-	size_t old_sendq = c->write_buffer.len;
-
-	// So far there's only one message tag we use, so we can do it simple;
-	// note that a 1024-character limit applies to messages with tags on
-	if (c->caps_enabled & IRC_CAP_SERVER_TIME)
-	{
-		long milliseconds; char buf[32]; struct tm tm;
-		time_t now = unixtime_msec (&milliseconds);
-		if (soft_assert (strftime (buf, sizeof buf,
-			"%Y-%m-%dT%T", gmtime_r (&now, &tm))))
-			str_append_printf (&c->write_buffer,
-				"@time=%s.%03ldZ ", buf, milliseconds);
-	}
-
-	// TODO: kill the connection above some "SendQ" threshold (careful!)
-	str_append_data (&c->write_buffer, s->str,
-		MIN (s->len, IRC_MAX_MESSAGE_LENGTH));
-	str_append (&c->write_buffer, "\r\n");
-	// XXX: we might want to move this elsewhere, so that it doesn't get called
-	//   as often; it's going to cause a lot of syscalls with epoll.
-	client_update_poller (c, NULL);
-
-	// Technically we haven't sent it yet but that's a minor detail
-	c->n_sent_messages++;
-	c->sent_bytes += c->write_buffer.len - old_sendq;
-}
-
-static void
-client_send (struct client *c, const char *format, ...)
-{
-	struct str tmp = str_make ();
-
-	va_list ap;
-	va_start (ap, format);
-	str_append_vprintf (&tmp, format, ap);
-	va_end (ap);
-
-	client_send_str (c, &tmp);
-	str_free (&tmp);
-}
-
-static void
-client_add_to_whowas (struct client *c)
-{
-	// Only keeping one entry for each nickname
-	// TODO: make sure this list doesn't get too long, for example by
-	//   putting them in a linked list ordered by time
-	str_map_set (&c->ctx->whowas, c->nickname, whowas_info_new (c));
-}
-
-static void
-client_unregister (struct client *c, const char *reason)
-{
-	if (!c->registered)
-		return;
-
-	char *message = xstrdup_printf (":%s!%s@%s QUIT :%s",
-		c->nickname, c->username, c->hostname, reason);
-	irc_send_to_roommates (c, message);
-	free (message);
-
-	struct str_map_unset_iter iter =
-		str_map_unset_iter_make (&c->ctx->channels);
-	struct channel *chan;
-	while ((chan = str_map_unset_iter_next (&iter)))
-	{
-		struct channel_user *user;
-		if (!(user = channel_get_user (chan, c)))
-			continue;
-		channel_remove_user (chan, user);
-		irc_channel_destroy_if_empty (c->ctx, chan);
-	}
-	str_map_unset_iter_free (&iter);
-
-	client_add_to_whowas (c);
-
-	str_map_set (&c->ctx->users, c->nickname, NULL);
-	cstr_set (&c->nickname, NULL);
-	c->registered = false;
-}
-
-static void
-client_kill (struct client *c, const char *reason)
-{
-	struct server_context *ctx = c->ctx;
-	client_unregister (c, reason ? reason : "Client exited");
-
-	if (c->address)
-		// Only log the event if address resolution has finished
-		print_debug ("closed connection to %s (%s)", c->address,
-			reason ? reason : "");
-
-	if (c->ssl)
-		// Note that we might have already called this once, but that is fine
-		(void) SSL_shutdown (c->ssl);
-
-	xclose (c->socket_fd);
-	c->socket_fd = -1;
-
-	// We don't fork any children, this is okay
-	c->socket_event.closed = true;
-	poller_fd_reset (&c->socket_event);
-	client_cancel_timers (c);
-
-	LIST_UNLINK (ctx->clients, c);
-	ctx->n_clients--;
-	client_destroy (c);
-
-	irc_try_finish_quit (ctx);
-}
-
-static void
-client_close_link (struct client *c, const char *reason)
-{
-	// Let's just cut the connection, the client can try again later.
-	// We also want to avoid accidentally setting poller events before
-	// address resolution has finished.
-	if (!c->initialized)
-	{
-		client_kill (c, reason);
-		return;
-	}
-	if (!soft_assert (!c->closing_link))
-		return;
-
-	// We push an `ERROR' message to the write buffer and let the poller send
-	// it, with some arbitrary timeout.  The `closing_link' state makes sure
-	// that a/ we ignore any successive messages, and b/ that the connection
-	// is killed after the write buffer is transferred and emptied.
-	client_send (c, "ERROR :Closing Link: %s[%s] (%s)",
-		c->nickname ? c->nickname : "*",
-		c->hostname /* TODO host IP? */, reason);
-	c->closing_link = true;
-
-	client_unregister (c, reason);
-	client_set_kill_timer (c);
-}
-
-static bool
-client_in_mask_list (const struct client *c, const struct strv *mask)
-{
-	char *client = xstrdup_printf ("%s!%s@%s",
-		c->nickname, c->username, c->hostname);
-	bool result = false;
-	for (size_t i = 0; i < mask->len; i++)
-		if (!irc_fnmatch (mask->vector[i], client))
-		{
-			result = true;
-			break;
-		}
-	free (client);
-	return result;
-}
-
-static char *
-client_get_ssl_cert_fingerprint (struct client *c)
-{
-	if (!c->ssl)
-		return NULL;
-
-	X509 *peer_cert = SSL_get_peer_certificate (c->ssl);
-	if (!peer_cert)
-		return NULL;
-
-	int cert_len = i2d_X509 (peer_cert, NULL);
-	if (cert_len < 0)
-		return NULL;
-
-	unsigned char cert[cert_len], *p = cert;
-	if (i2d_X509 (peer_cert, &p) < 0)
-		return NULL;
-
-	unsigned char hash[SHA_DIGEST_LENGTH];
-	SHA1 (cert, cert_len, hash);
-
-	struct str fingerprint = str_make ();
-	for (size_t i = 0; i < sizeof hash; i++)
-		str_append_printf (&fingerprint, "%02x", hash[i]);
-	return str_steal (&fingerprint);
-}
-
-// --- Timers ------------------------------------------------------------------
-
-static void
-client_cancel_timers (struct client *c)
-{
-	poller_timer_reset (&c->kill_timer);
-	poller_timer_reset (&c->timeout_timer);
-	poller_timer_reset (&c->ping_timer);
-	poller_timer_reset (&c->gni_timer);
-}
-
-static void
-client_set_timer (struct client *c,
-	struct poller_timer *timer, unsigned interval)
-{
-	client_cancel_timers (c);
-	poller_timer_set (timer, interval * 1000);
-}
-
-static void
-on_client_kill_timer (struct client *c)
-{
-	hard_assert (!c->initialized || c->closing_link);
-	client_kill (c, NULL);
-}
-
-static void
-client_set_kill_timer (struct client *c)
-{
-	client_set_timer (c, &c->kill_timer, c->ctx->ping_interval);
-}
-
-static void
-on_client_timeout_timer (struct client *c)
-{
-	char *reason = xstrdup_printf
-		("Ping timeout: >%u seconds", c->ctx->ping_interval);
-	client_close_link (c, reason);
-	free (reason);
-}
-
-static void
-on_client_ping_timer (struct client *c)
-{
-	hard_assert (!c->closing_link);
-	client_send (c, "PING :%s", c->ctx->server_name);
-	client_set_timer (c, &c->timeout_timer, c->ctx->ping_interval);
-}
-
-static void
-client_set_ping_timer (struct client *c)
-{
-	client_set_timer (c, &c->ping_timer, c->ctx->ping_interval);
-}
-
-// --- IRC command handling ----------------------------------------------------
-
-static void
-irc_make_reply (struct client *c, int id, va_list ap, struct str *output)
-{
-	str_append_printf (output, ":%s %03d %s ",
-		c->ctx->server_name, id, c->nickname ? c->nickname : "*");
-	str_append_vprintf (output,
-		irc_get_text (c->ctx, id, g_default_replies[id]), ap);
-}
-
-// XXX: this way we cannot typecheck the arguments, so we must be careful
-static void
-irc_send_reply (struct client *c, int id, ...)
-{
-	struct str reply = str_make ();
-
-	va_list ap;
-	va_start (ap, id);
-	irc_make_reply (c, id, ap, &reply);
-	va_end (ap);
-
-	client_send_str (c, &reply);
-	str_free (&reply);
-}
-
-/// Send a space-separated list of words across as many replies as needed
-static void
-irc_send_reply_vector (struct client *c, int id, char **items, ...)
-{
-	struct str common = str_make ();
-
-	va_list ap;
-	va_start (ap, items);
-	irc_make_reply (c, id, ap, &common);
-	va_end (ap);
-
-	// We always send at least one message (there might be a client that
-	// expects us to send this message at least once)
-	do
-	{
-		struct str reply = str_make ();
-		str_append_str (&reply, &common);
-
-		// If not even a single item fits in the limit (which may happen,
-		// in theory) it just gets cropped.  We could also skip it.
-		if (*items)
-			str_append (&reply, *items++);
-
-		// Append as many items as fits in a single message
-		while (*items
-			&& reply.len + 1 + strlen (*items) <= IRC_MAX_MESSAGE_LENGTH)
-			str_append_printf (&reply, " %s", *items++);
-
-		client_send_str (c, &reply);
-		str_free (&reply);
-	}
-	while (*items);
-	str_free (&common);
-}
-
-#define RETURN_WITH_REPLY(c, ...)                                              \
-	BLOCK_START                                                                \
-		irc_send_reply ((c), __VA_ARGS__);                                     \
-		return;                                                                \
-	BLOCK_END
-
-static void
-irc_send_motd (struct client *c)
-{
-	struct server_context *ctx = c->ctx;
-	if (!ctx->motd.len)
-		RETURN_WITH_REPLY (c, IRC_ERR_NOMOTD);
-
-	irc_send_reply (c, IRC_RPL_MOTDSTART, ctx->server_name);
-	for (size_t i = 0; i < ctx->motd.len; i++)
-		irc_send_reply (c, IRC_RPL_MOTD, ctx->motd.vector[i]);
-	irc_send_reply (c, IRC_RPL_ENDOFMOTD);
-}
-
-static void
-irc_send_lusers (struct client *c)
-{
-	int n_users = 0, n_services = 0, n_opers = 0, n_unknown = 0;
-	for (struct client *link = c->ctx->clients; link; link = link->next)
-	{
-		if (link->registered)
-			n_users++;
-		else
-			n_unknown++;
-		if (link->mode & IRC_USER_MODE_OPERATOR)
-			n_opers++;
-	}
-
-	int n_channels = 0;
-	struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
-	struct channel *chan;
-	while ((chan = str_map_iter_next (&iter)))
-		if (!(chan->modes & IRC_CHAN_MODE_SECRET)
-		 || channel_get_user (chan, c))
-			n_channels++;
-
-	irc_send_reply (c, IRC_RPL_LUSERCLIENT,
-		n_users, n_services, 1 /* servers total */);
-	if (n_opers)
-		irc_send_reply (c, IRC_RPL_LUSEROP, n_opers);
-	if (n_unknown)
-		irc_send_reply (c, IRC_RPL_LUSERUNKNOWN, n_unknown);
-	if (n_channels)
-		irc_send_reply (c, IRC_RPL_LUSERCHANNELS, n_channels);
-	irc_send_reply (c, IRC_RPL_LUSERME,
-		n_users + n_services + n_unknown, 0 /* peer servers */);
-}
-
-static bool
-irc_is_this_me (struct server_context *ctx, const char *target)
-{
-	// Target servers can also be matched by their users
-	return !irc_fnmatch (target, ctx->server_name)
-		|| str_map_find (&ctx->users, target);
-}
-
-static void
-irc_send_isupport (struct client *c)
-{
-	// Only # channels, +e supported, +I supported, unlimited arguments to MODE
-	irc_send_reply (c, IRC_RPL_ISUPPORT, "CHANTYPES=# EXCEPTS INVEX MODES"
-		" TARGMAX=WHOIS:,LIST:,NAMES:,PRIVMSG:1,NOTICE:1,KICK:"
-		" NICKLEN=" XSTRINGIFY (IRC_MAX_NICKNAME)
-		" CHANNELLEN=" XSTRINGIFY (IRC_MAX_CHANNEL_NAME));
-}
-
-static void
-irc_try_finish_registration (struct client *c)
-{
-	struct server_context *ctx = c->ctx;
-	if (!c->nickname || !c->username || !c->realname)
-		return;
-	if (c->registered || c->cap_negotiating)
-		return;
-
-	c->registered = true;
-	irc_send_reply (c, IRC_RPL_WELCOME, c->nickname, c->username, c->hostname);
-
-	irc_send_reply (c, IRC_RPL_YOURHOST, ctx->server_name, PROGRAM_VERSION);
-	// The purpose of this message eludes me
-	irc_send_reply (c, IRC_RPL_CREATED, __DATE__);
-	irc_send_reply (c, IRC_RPL_MYINFO, ctx->server_name, PROGRAM_VERSION,
-		IRC_SUPPORTED_USER_MODES, IRC_SUPPORTED_CHAN_MODES);
-
-	irc_send_isupport (c);
-	irc_send_lusers (c);
-	irc_send_motd (c);
-
-	char *mode = client_get_mode (c);
-	if (*mode)
-		client_send (c, ":%s MODE %s :+%s", c->nickname, c->nickname, mode);
-	free (mode);
-
-	hard_assert (c->ssl_cert_fingerprint == NULL);
-	if ((c->ssl_cert_fingerprint = client_get_ssl_cert_fingerprint (c)))
-		client_send (c, ":%s NOTICE %s :"
-			"Your TLS client certificate fingerprint is %s",
-			ctx->server_name, c->nickname, c->ssl_cert_fingerprint);
-
-	str_map_set (&ctx->whowas, c->nickname, NULL);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-// IRCv3 capability negotiation.  See http://ircv3.org for details.
-
-struct irc_cap_args
-{
-	const char *subcommand;             ///< The subcommand being processed
-	const char *full_params;            ///< Whole parameter string
-	struct strv params;                 ///< Split parameters
-	const char *target;                 ///< Target parameter for replies
-};
-
-static struct
-{
-	unsigned flag;                      ///< Flag
-	const char *name;                   ///< Name of the capability
-}
-irc_cap_table[] =
-{
-	{ IRC_CAP_MULTI_PREFIX,             "multi-prefix"      },
-	{ IRC_CAP_INVITE_NOTIFY,            "invite-notify"     },
-	{ IRC_CAP_ECHO_MESSAGE,             "echo-message"      },
-	{ IRC_CAP_USERHOST_IN_NAMES,        "userhost-in-names" },
-	{ IRC_CAP_SERVER_TIME,              "server-time"       },
-};
-
-static void
-irc_handle_cap_ls (struct client *c, struct irc_cap_args *a)
-{
-	if (a->params.len == 1
-	 && !xstrtoul (&c->cap_version, a->params.vector[0], 10))
-		irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
-			a->subcommand, "Ignoring invalid protocol version number");
-
-	c->cap_negotiating = true;
-	client_send (c, ":%s CAP %s LS :multi-prefix invite-notify echo-message"
-		" userhost-in-names server-time", c->ctx->server_name, a->target);
-}
-
-static void
-irc_handle_cap_list (struct client *c, struct irc_cap_args *a)
-{
-	struct strv caps = strv_make ();
-	for (size_t i = 0; i < N_ELEMENTS (irc_cap_table); i++)
-		if (c->caps_enabled & irc_cap_table[i].flag)
-			strv_append (&caps, irc_cap_table[i].name);
-
-	char *caps_str = strv_join (&caps, " ");
-	strv_free (&caps);
-	client_send (c, ":%s CAP %s LIST :%s",
-		c->ctx->server_name, a->target, caps_str);
-	free (caps_str);
-}
-
-static unsigned
-irc_decode_capability (const char *name)
-{
-	for (size_t i = 0; i < N_ELEMENTS (irc_cap_table); i++)
-		if (!strcmp (irc_cap_table[i].name, name))
-			return irc_cap_table[i].flag;
-	return 0;
-}
-
-static void
-irc_handle_cap_req (struct client *c, struct irc_cap_args *a)
-{
-	c->cap_negotiating = true;
-
-	unsigned new_caps = c->caps_enabled;
-	bool success = true;
-	for (size_t i = 0; i < a->params.len; i++)
-	{
-		bool removing = false;
-		const char *name = a->params.vector[i];
-		if (*name == '-')
-		{
-			removing = true;
-			name++;
-		}
-
-		unsigned cap;
-		if (!(cap = irc_decode_capability (name)))
-			success = false;
-		else if (removing)
-			new_caps &= ~cap;
-		else
-			new_caps |=  cap;
-	}
-
-	if (success)
-	{
-		c->caps_enabled = new_caps;
-		client_send (c, ":%s CAP %s ACK :%s",
-			c->ctx->server_name, a->target, a->full_params);
-	}
-	else
-		client_send (c, ":%s CAP %s NAK :%s",
-			c->ctx->server_name, a->target, a->full_params);
-}
-
-static void
-irc_handle_cap_ack (struct client *c, struct irc_cap_args *a)
-{
-	if (a->params.len)
-		irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
-			a->subcommand, "No acknowledgable capabilities supported");
-}
-
-static void
-irc_handle_cap_end (struct client *c, struct irc_cap_args *a)
-{
-	(void) a;
-
-	c->cap_negotiating = false;
-	irc_try_finish_registration (c);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-struct irc_cap_command
-{
-	const char *name;
-	void (*handler) (struct client *, struct irc_cap_args *);
-};
-
-static void
-irc_register_cap_handlers (struct server_context *ctx)
-{
-	static const struct irc_cap_command cap_handlers[] =
-	{
-		{ "LS",   irc_handle_cap_ls   },
-		{ "LIST", irc_handle_cap_list },
-		{ "REQ",  irc_handle_cap_req  },
-		{ "ACK",  irc_handle_cap_ack  },
-		{ "END",  irc_handle_cap_end  },
-	};
-
-	for (size_t i = 0; i < N_ELEMENTS (cap_handlers); i++)
-	{
-		const struct irc_cap_command *cmd = &cap_handlers[i];
-		str_map_set (&ctx->cap_handlers, cmd->name, (void *) cmd);
-	}
-}
-
-static void
-irc_handle_cap (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	struct irc_cap_args args;
-	args.target = c->nickname ? c->nickname : "*";
-	args.subcommand = msg->params.vector[0];
-	args.full_params = "";
-	args.params = strv_make ();
-
-	if (msg->params.len > 1)
-	{
-		args.full_params = msg->params.vector[1];
-		cstr_split (args.full_params, " ", true, &args.params);
-	}
-
-	struct irc_cap_command *cmd =
-		str_map_find (&c->ctx->cap_handlers, args.subcommand);
-	if (!cmd)
-		irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
-			args.subcommand, "Invalid CAP subcommand");
-	else
-		cmd->handler (c, &args);
-
-	strv_free (&args.params);
-}
-
-static void
-irc_handle_pass (const struct irc_message *msg, struct client *c)
-{
-	if (c->registered)
-		irc_send_reply (c, IRC_ERR_ALREADYREGISTERED);
-	else if (msg->params.len < 1)
-		irc_send_reply (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	// We have TLS client certificates for this purpose; ignoring
-}
-
-static void
-irc_handle_nick (const struct irc_message *msg, struct client *c)
-{
-	struct server_context *ctx = c->ctx;
-
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NONICKNAMEGIVEN);
-
-	const char *nickname = msg->params.vector[0];
-	if (irc_validate_nickname (nickname) != VALIDATION_OK)
-		RETURN_WITH_REPLY (c, IRC_ERR_ERRONEOUSNICKNAME, nickname);
-
-	struct client *client = str_map_find (&ctx->users, nickname);
-	if (client && client != c)
-		RETURN_WITH_REPLY (c, IRC_ERR_NICKNAMEINUSE, nickname);
-
-	// Nothing to do here, let's not annoy roommates
-	if (c->nickname && !strcmp (c->nickname, nickname))
-		return;
-
-	if (c->registered)
-	{
-		client_add_to_whowas (c);
-
-		char *message = xstrdup_printf (":%s!%s@%s NICK :%s",
-			c->nickname, c->username, c->hostname, nickname);
-		irc_send_to_roommates (c, message);
-		client_send (c, "%s", message);
-		free (message);
-	}
-
-	// Release the old nickname and allocate a new one
-	if (c->nickname)
-		str_map_set (&ctx->users, c->nickname, NULL);
-
-	cstr_set (&c->nickname, xstrdup (nickname));
-	str_map_set (&ctx->users, nickname, c);
-
-	irc_try_finish_registration (c);
-}
-
-static void
-irc_handle_user (const struct irc_message *msg, struct client *c)
-{
-	if (c->registered)
-		RETURN_WITH_REPLY (c, IRC_ERR_ALREADYREGISTERED);
-	if (msg->params.len < 4)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	const char *username = msg->params.vector[0];
-	const char *mode     = msg->params.vector[1];
-	const char *realname = msg->params.vector[3];
-
-	// Unfortunately the protocol doesn't give us any means of rejecting it
-	if (!irc_is_valid_user (username))
-		username = "xxx";
-
-	cstr_set (&c->username, xstrdup (username));
-	cstr_set (&c->realname, xstrdup (realname));
-	c->mode = 0;
-
-	unsigned long m;
-	if (xstrtoul (&m, mode, 10))
-	{
-		if (m & 4)  c->mode |= IRC_USER_MODE_RX_WALLOPS;
-		if (m & 8)  c->mode |= IRC_USER_MODE_INVISIBLE;
-	}
-
-	irc_try_finish_registration (c);
-}
-
-static void
-irc_handle_userhost (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	struct str reply = str_make ();
-	for (size_t i = 0; i < 5 && i < msg->params.len; i++)
-	{
-		const char *nick = msg->params.vector[i];
-		struct client *target = str_map_find (&c->ctx->users, nick);
-		if (!target)
-			continue;
-
-		if (i)
-			str_append_c (&reply, ' ');
-		str_append (&reply, nick);
-		if (target->mode & IRC_USER_MODE_OPERATOR)
-			str_append_c (&reply, '*');
-		str_append_printf (&reply, "=%c%s@%s",
-			target->away_message ? '-' : '+',
-			target->username, target->hostname);
-	}
-	irc_send_reply (c, IRC_RPL_USERHOST, reply.str);
-	str_free (&reply);
-}
-
-static void
-irc_handle_lusers (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
-		irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-	else
-		irc_send_lusers (c);
-}
-
-static void
-irc_handle_motd (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
-		irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-	else
-		irc_send_motd (c);
-}
-
-static void
-irc_handle_ping (const struct irc_message *msg, struct client *c)
-{
-	// XXX: the RFC is pretty incomprehensible about the exact usage
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
-		irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-	else if (msg->params.len < 1)
-		irc_send_reply (c, IRC_ERR_NOORIGIN);
-	else
-		client_send (c, ":%s PONG :%s",
-			c->ctx->server_name, msg->params.vector[0]);
-}
-
-static void
-irc_handle_pong (const struct irc_message *msg, struct client *c)
-{
-	// We are the only server, so we don't have to care too much
-	if (msg->params.len < 1)
-		irc_send_reply (c, IRC_ERR_NOORIGIN);
-	else
-		// Set a new timer to send another PING
-		client_set_ping_timer (c);
-}
-
-static void
-irc_handle_quit (const struct irc_message *msg, struct client *c)
-{
-	char *reason = xstrdup_printf ("Quit: %s",
-		msg->params.len > 0 ? msg->params.vector[0] : c->nickname);
-	client_close_link (c, reason);
-	free (reason);
-}
-
-static void
-irc_handle_time (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
-	char buf[32] = "";
-	time_t now = time (NULL);
-	struct tm tm;
-	strftime (buf, sizeof buf, "%a %b %d %Y %T", localtime_r (&now, &tm));
-	irc_send_reply (c, IRC_RPL_TIME, c->ctx->server_name, buf);
-}
-
-static void
-irc_handle_version (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
-	irc_send_reply (c, IRC_RPL_VERSION, PROGRAM_VERSION, g_debug_mode,
-		c->ctx->server_name, PROGRAM_NAME " " PROGRAM_VERSION);
-	irc_send_isupport (c);
-}
-
-static void
-irc_channel_multicast (struct channel *chan, const char *message,
-	struct client *except)
-{
-	for (struct channel_user *iter = chan->users; iter; iter = iter->next)
-		if (iter->c != except)
-			client_send (iter->c, "%s", message);
-}
-
-static bool
-irc_modify_mode (unsigned *mask, unsigned mode, bool add)
-{
-	unsigned orig = *mask;
-	if (add)
-		*mask |= mode;
-	else
-		*mask &= ~mode;
-	return *mask != orig;
-}
-
-static void
-irc_update_user_mode (struct client *c, unsigned new_mode)
-{
-	unsigned old_mode = c->mode;
-	c->mode = new_mode;
-
-	unsigned added   = new_mode & ~old_mode;
-	unsigned removed = old_mode & ~new_mode;
-
-	struct str diff = str_make ();
-	if (added)
-	{
-		str_append_c (&diff, '+');
-		client_mode_to_str (added, &diff);
-	}
-	if (removed)
-	{
-		str_append_c (&diff, '-');
-		client_mode_to_str (removed, &diff);
-	}
-
-	if (diff.len)
-		client_send (c, ":%s MODE %s :%s",
-			c->nickname, c->nickname, diff.str);
-	str_free (&diff);
-}
-
-static void
-irc_handle_user_mode_change (struct client *c, const char *mode_string)
-{
-	unsigned new_mode = c->mode;
-	bool adding = true;
-
-	while (*mode_string)
-	switch (*mode_string++)
-	{
-	case '+':  adding = true;   break;
-	case '-':  adding = false;  break;
-
-	case 'a':
-		// Ignore, the client should use AWAY
-		break;
-	case 'i':
-		irc_modify_mode (&new_mode, IRC_USER_MODE_INVISIBLE, adding);
-		break;
-	case 'w':
-		irc_modify_mode (&new_mode, IRC_USER_MODE_RX_WALLOPS, adding);
-		break;
-	case 'r':
-		// It's not possible to un-restrict yourself
-		if (adding)
-			new_mode |= IRC_USER_MODE_RESTRICTED;
-		break;
-	case 'o':
-		if (!adding)
-			new_mode &= ~IRC_USER_MODE_OPERATOR;
-		else if (c->ssl_cert_fingerprint
-			&& str_map_find (&c->ctx->operators, c->ssl_cert_fingerprint))
-			new_mode |= IRC_USER_MODE_OPERATOR;
-		else
-			client_send (c, ":%s NOTICE %s :Either you're not using an TLS"
-				" client certificate, or the fingerprint doesn't match",
-				c->ctx->server_name, c->nickname);
-		break;
-	case 's':
-		irc_modify_mode (&new_mode, IRC_USER_MODE_RX_SERVER_NOTICES, adding);
-		break;
-	default:
-		RETURN_WITH_REPLY (c, IRC_ERR_UMODEUNKNOWNFLAG);
-	}
-	irc_update_user_mode (c, new_mode);
-}
-
-static void
-irc_send_channel_list (struct client *c, const char *channel_name,
-	const struct strv *list, int reply, int end_reply)
-{
-	for (size_t i = 0; i < list->len; i++)
-		irc_send_reply (c, reply, channel_name, list->vector[i]);
-	irc_send_reply (c, end_reply, channel_name);
-}
-
-static char *
-irc_check_expand_user_mask (const char *mask)
-{
-	struct str result = str_make ();
-	str_append (&result, mask);
-
-	// Make sure it is a complete mask
-	if (!strchr (result.str, '!'))
-		str_append (&result, "!*");
-	if (!strchr (result.str, '@'))
-		str_append (&result, "@*");
-
-	// And validate whatever the result is
-	if (!irc_is_valid_user_mask (result.str))
-	{
-		str_free (&result);
-		return NULL;
-	}
-	return str_steal (&result);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-// Channel MODE command handling.  This is by far the worst command to implement
-// from the whole RFC; don't blame me if it doesn't work exactly as expected.
-
-struct mode_processor
-{
-	// Inputs to set after initialization:
-
-	char **params;                      ///< Mode string parameters
-
-	struct client *c;                   ///< Who does the changes
-	struct channel *channel;            ///< The channel we're modifying
-	struct channel_user *user;          ///< Presence of the client in the chan
-
-	// Internals:
-
-	bool adding;                        ///< Currently adding modes
-	char mode_char;                     ///< Currently processed mode char
-
-	struct str added;                   ///< Added modes
-	struct str removed;                 ///< Removed modes
-
-	struct strv added_params;           ///< Params for added modes
-	struct strv removed_params;         ///< Params for removed modes
-
-	struct str *output;                 ///< "added" or "removed"
-	struct strv *output_params;         ///< Similarly for "*_params"
-};
-
-static struct mode_processor
-mode_processor_make (void)
-{
-	return (struct mode_processor)
-	{
-		.added   = str_make (), .added_params   = strv_make (),
-		.removed = str_make (), .removed_params = strv_make (),
-	};
-}
-
-static void
-mode_processor_free (struct mode_processor *self)
-{
-	str_free (&self->added);
-	str_free (&self->removed);
-
-	strv_free (&self->added_params);
-	strv_free (&self->removed_params);
-}
-
-static const char *
-mode_processor_next_param (struct mode_processor *self)
-{
-	if (!*self->params)
-		return NULL;
-	return *self->params++;
-}
-
-static bool
-mode_processor_check_operator (struct mode_processor *self)
-{
-	if ((self->user && (self->user->modes & IRC_CHAN_MODE_OPERATOR))
-		|| (self->c->mode & IRC_USER_MODE_OPERATOR))
-		return true;
-
-	irc_send_reply (self->c, IRC_ERR_CHANOPRIVSNEEDED, self->channel->name);
-	return false;
-}
-
-static void
-mode_processor_do_user (struct mode_processor *self, int mode)
-{
-	const char *target = mode_processor_next_param (self);
-	if (!mode_processor_check_operator (self) || !target)
-		return;
-
-	struct client *client;
-	struct channel_user *target_user;
-	if (!(client = str_map_find (&self->c->ctx->users, target)))
-		irc_send_reply (self->c, IRC_ERR_NOSUCHNICK, target);
-	else if (!(target_user = channel_get_user (self->channel, client)))
-		irc_send_reply (self->c, IRC_ERR_USERNOTINCHANNEL,
-			target, self->channel->name);
-	else if (irc_modify_mode (&target_user->modes, mode, self->adding))
-	{
-		str_append_c (self->output, self->mode_char);
-		strv_append (self->output_params, client->nickname);
-	}
-}
-
-static bool
-mode_processor_do_chan (struct mode_processor *self, int mode)
-{
-	if (!mode_processor_check_operator (self)
-	 || !irc_modify_mode (&self->channel->modes, mode, self->adding))
-		return false;
-
-	str_append_c (self->output, self->mode_char);
-	return true;
-}
-
-static void
-mode_processor_do_chan_remove
-	(struct mode_processor *self, char mode_char, int mode)
-{
-	if (self->adding
-	 && irc_modify_mode (&self->channel->modes, mode, false))
-		str_append_c (&self->removed, mode_char);
-}
-
-static void
-mode_processor_do_list (struct mode_processor *self,
-	struct strv *list, int list_msg, int end_msg)
-{
-	const char *target = mode_processor_next_param (self);
-	if (!target)
-	{
-		if (self->adding)
-			irc_send_channel_list (self->c, self->channel->name,
-				list, list_msg, end_msg);
-		return;
-	}
-
-	if (!mode_processor_check_operator (self))
-		return;
-
-	char *mask = irc_check_expand_user_mask (target);
-	if (!mask)
-		return;
-
-	size_t i;
-	for (i = 0; i < list->len; i++)
-		if (!irc_strcmp (list->vector[i], mask))
-			break;
-
-	bool found = i != list->len;
-	if (found != self->adding)
-	{
-		if (self->adding)
-			strv_append (list, mask);
-		else
-			strv_remove (list, i);
-
-		str_append_c (self->output, self->mode_char);
-		strv_append (self->output_params, mask);
-	}
-	free (mask);
-}
-
-static void
-mode_processor_do_key (struct mode_processor *self)
-{
-	const char *target = mode_processor_next_param (self);
-	if (!mode_processor_check_operator (self) || !target)
-		return;
-
-	if (!self->adding)
-	{
-		if (!self->channel->key || irc_strcmp (target, self->channel->key))
-			return;
-
-		str_append_c (&self->removed, self->mode_char);
-		strv_append (&self->removed_params, self->channel->key);
-		cstr_set (&self->channel->key, NULL);
-	}
-	else if (!irc_is_valid_key (target))
-		// TODO: we should notify the user somehow
-		return;
-	else if (self->channel->key)
-		irc_send_reply (self->c, IRC_ERR_KEYSET, self->channel->name);
-	else
-	{
-		self->channel->key = xstrdup (target);
-		str_append_c (&self->added, self->mode_char);
-		strv_append (&self->added_params, self->channel->key);
-	}
-}
-
-static void
-mode_processor_do_limit (struct mode_processor *self)
-{
-	if (!mode_processor_check_operator (self))
-		return;
-
-	const char *target;
-	if (!self->adding)
-	{
-		if (self->channel->user_limit == -1)
-			return;
-
-		self->channel->user_limit = -1;
-		str_append_c (&self->removed, self->mode_char);
-	}
-	else if ((target = mode_processor_next_param (self)))
-	{
-		unsigned long x;
-		if (xstrtoul (&x, target, 10) && x > 0 && x <= LONG_MAX)
-		{
-			self->channel->user_limit = x;
-			str_append_c (&self->added, self->mode_char);
-			strv_append (&self->added_params, target);
-		}
-	}
-}
-
-static bool
-mode_processor_step (struct mode_processor *self, char mode_char)
-{
-	switch ((self->mode_char = mode_char))
-	{
-	case '+':
-		self->adding = true;
-		self->output = &self->added;
-		self->output_params = &self->added_params;
-		break;
-	case '-':
-		self->adding = false;
-		self->output = &self->removed;
-		self->output_params = &self->removed_params;
-		break;
-
-#define USER(mode) mode_processor_do_user (self, (mode))
-#define CHAN(mode) mode_processor_do_chan (self, (mode))
-
-	case 'o': USER (IRC_CHAN_MODE_OPERATOR);         break;
-	case 'v': USER (IRC_CHAN_MODE_VOICE);            break;
-
-	case 'i': CHAN (IRC_CHAN_MODE_INVITE_ONLY);      break;
-	case 'm': CHAN (IRC_CHAN_MODE_MODERATED);        break;
-	case 'n': CHAN (IRC_CHAN_MODE_NO_OUTSIDE_MSGS);  break;
-	case 'q': CHAN (IRC_CHAN_MODE_QUIET);            break;
-	case 't': CHAN (IRC_CHAN_MODE_PROTECTED_TOPIC);  break;
-
-	case 'p':
-		if (CHAN (IRC_CHAN_MODE_PRIVATE))
-			mode_processor_do_chan_remove (self, 's', IRC_CHAN_MODE_SECRET);
-		break;
-	case 's':
-		if (CHAN (IRC_CHAN_MODE_SECRET))
-			mode_processor_do_chan_remove (self, 'p', IRC_CHAN_MODE_PRIVATE);
-		break;
-
-#undef USER
-#undef CHAN
-
-	case 'b':
-		mode_processor_do_list (self, &self->channel->ban_list,
-			IRC_RPL_BANLIST, IRC_RPL_ENDOFBANLIST);
-		break;
-	case 'e':
-		mode_processor_do_list (self, &self->channel->exception_list,
-			IRC_RPL_EXCEPTLIST, IRC_RPL_ENDOFEXCEPTLIST);
-		break;
-	case 'I':
-		mode_processor_do_list (self, &self->channel->invite_list,
-			IRC_RPL_INVITELIST, IRC_RPL_ENDOFINVITELIST);
-		break;
-
-	case 'k':
-		mode_processor_do_key (self);
-		break;
-	case 'l':
-		mode_processor_do_limit (self);
-		break;
-
-	default:
-		// It's not safe to continue, results could be undesired
-		irc_send_reply (self->c, IRC_ERR_UNKNOWNMODE,
-			mode_char, self->channel->name);
-		return false;
-	}
-	return true;
-}
-
-static void
-irc_handle_chan_mode_change
-	(struct client *c, struct channel *chan, char *params[])
-{
-	struct mode_processor p = mode_processor_make ();
-	p.params = params;
-	p.channel = chan;
-	p.c = c;
-	p.user = channel_get_user (chan, c);
-
-	const char *mode_string;
-	while ((mode_string = mode_processor_next_param (&p)))
-	{
-		mode_processor_step (&p, '+');
-		while (*mode_string)
-			if (!mode_processor_step (&p, *mode_string++))
-				goto done_processing;
-	}
-
-	// TODO: limit to three changes with parameter per command
-done_processing:
-	if (p.added.len || p.removed.len)
-	{
-		struct str message = str_make ();
-		str_append_printf (&message, ":%s!%s@%s MODE %s ",
-			p.c->nickname, p.c->username, p.c->hostname,
-			p.channel->name);
-		if (p.added.len)
-			str_append_printf (&message, "+%s", p.added.str);
-		if (p.removed.len)
-			str_append_printf (&message, "-%s", p.removed.str);
-		for (size_t i = 0; i < p.added_params.len; i++)
-			str_append_printf (&message, " %s", p.added_params.vector[i]);
-		for (size_t i = 0; i < p.removed_params.len; i++)
-			str_append_printf (&message, " %s", p.removed_params.vector[i]);
-		irc_channel_multicast (p.channel, message.str, NULL);
-		str_free (&message);
-	}
-	mode_processor_free (&p);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-irc_handle_mode (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	const char *target = msg->params.vector[0];
-	struct client *client = str_map_find (&c->ctx->users, target);
-	struct channel *chan = str_map_find (&c->ctx->channels, target);
-
-	if (client)
-	{
-		if (irc_strcmp (target, c->nickname))
-			RETURN_WITH_REPLY (c, IRC_ERR_USERSDONTMATCH);
-
-		if (msg->params.len < 2)
-		{
-			char *mode = client_get_mode (client);
-			irc_send_reply (c, IRC_RPL_UMODEIS, mode);
-			free (mode);
-		}
-		else
-			irc_handle_user_mode_change (c, msg->params.vector[1]);
-	}
-	else if (chan)
-	{
-		if (msg->params.len < 2)
-		{
-			char *mode = channel_get_mode (chan, channel_get_user (chan, c));
-			irc_send_reply (c, IRC_RPL_CHANNELMODEIS, target, mode);
-			irc_send_reply (c, IRC_RPL_CREATIONTIME,
-				target, (long long) chan->created);
-			free (mode);
-		}
-		else
-			irc_handle_chan_mode_change (c, chan, &msg->params.vector[1]);
-	}
-	else
-		irc_send_reply (c, IRC_ERR_NOSUCHNICK, target);
-}
-
-static void
-irc_handle_user_message (const struct irc_message *msg, struct client *c,
-	const char *command, bool allow_away_reply)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NORECIPIENT, msg->command);
-	if (msg->params.len < 2 || !*msg->params.vector[1])
-		RETURN_WITH_REPLY (c, IRC_ERR_NOTEXTTOSEND);
-
-	const char *target = msg->params.vector[0];
-	const char *text   = msg->params.vector[1];
-	struct client *client = str_map_find (&c->ctx->users, target);
-	if (client)
-	{
-		client_send (client, ":%s!%s@%s %s %s :%s",
-			c->nickname, c->username, c->hostname, command, target, text);
-		if (allow_away_reply && client->away_message)
-			irc_send_reply (c, IRC_RPL_AWAY, target, client->away_message);
-
-		// Acknowledging a message from the client to itself would be silly
-		if (client != c && (c->caps_enabled & IRC_CAP_ECHO_MESSAGE))
-			client_send (c, ":%s!%s@%s %s %s :%s",
-				c->nickname, c->username, c->hostname, command, target, text);
-		return;
-	}
-
-	struct channel *chan = str_map_find (&c->ctx->channels, target);
-	if (chan)
-	{
-		struct channel_user *user = channel_get_user (chan, c);
-		if ((chan->modes & IRC_CHAN_MODE_NO_OUTSIDE_MSGS) && !user)
-			RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
-		if ((chan->modes & IRC_CHAN_MODE_MODERATED) && (!user ||
-			!(user->modes & (IRC_CHAN_MODE_VOICE | IRC_CHAN_MODE_OPERATOR))))
-			RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
-		if (client_in_mask_list (c, &chan->ban_list)
-		 && !client_in_mask_list (c, &chan->exception_list))
-			RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
-
-		char *message = xstrdup_printf (":%s!%s@%s %s %s :%s",
-			c->nickname, c->username, c->hostname, command, target, text);
-		irc_channel_multicast (chan, message,
-			(c->caps_enabled & IRC_CAP_ECHO_MESSAGE) ? NULL : c);
-		free (message);
-		return;
-	}
-
-	irc_send_reply (c, IRC_ERR_NOSUCHNICK, target);
-}
-
-static void
-irc_handle_privmsg (const struct irc_message *msg, struct client *c)
-{
-	irc_handle_user_message (msg, c, "PRIVMSG", true);
-	// Let's not care too much about success or failure
-	c->last_active = time (NULL);
-}
-
-static void
-irc_handle_notice (const struct irc_message *msg, struct client *c)
-{
-	irc_handle_user_message (msg, c, "NOTICE", false);
-}
-
-static void
-irc_send_rpl_list (struct client *c, const struct channel *chan)
-{
-	int visible = 0;
-	for (struct channel_user *user = chan->users;
-		 user; user = user->next)
-		// XXX: maybe we should skip IRC_USER_MODE_INVISIBLE
-		visible++;
-
-	irc_send_reply (c, IRC_RPL_LIST, chan->name, visible, chan->topic);
-}
-
-static void
-irc_handle_list (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-
-	struct channel *chan;
-	if (msg->params.len == 0)
-	{
-		struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
-		while ((chan = str_map_iter_next (&iter)))
-			if (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
-			 || channel_get_user (chan, c))
-				irc_send_rpl_list (c, chan);
-	}
-	else
-	{
-		struct strv channels = strv_make ();
-		cstr_split (msg->params.vector[0], ",", true, &channels);
-		for (size_t i = 0; i < channels.len; i++)
-			if ((chan = str_map_find (&c->ctx->channels, channels.vector[i]))
-			 && (!(chan->modes & IRC_CHAN_MODE_SECRET)
-			 || channel_get_user (chan, c)))
-				irc_send_rpl_list (c, chan);
-		strv_free (&channels);
-	}
-	irc_send_reply (c, IRC_RPL_LISTEND);
-}
-
-static void
-irc_append_prefixes (struct client *c, struct channel_user *user,
-	struct str *output)
-{
-	struct str prefixes = str_make ();
-	if (user->modes & IRC_CHAN_MODE_OPERATOR)  str_append_c (&prefixes, '@');
-	if (user->modes & IRC_CHAN_MODE_VOICE)     str_append_c (&prefixes, '+');
-
-	if (prefixes.len)
-	{
-		if (c->caps_enabled & IRC_CAP_MULTI_PREFIX)
-			str_append   (output, prefixes.str);
-		else
-			str_append_c (output, prefixes.str[0]);
-	}
-	str_free (&prefixes);
-}
-
-static char *
-irc_make_rpl_namreply_item
-	(struct client *c, struct client *target, struct channel_user *user)
-{
-	struct str result = str_make ();
-
-	if (user)
-		irc_append_prefixes (c, user, &result);
-
-	str_append (&result, target->nickname);
-	if (c->caps_enabled & IRC_CAP_USERHOST_IN_NAMES)
-		str_append_printf (&result,
-			"!%s@%s", target->username, target->hostname);
-	return str_steal (&result);
-}
-
-static void
-irc_send_rpl_namreply (struct client *c, const struct channel *chan,
-	struct str_map *used_nicks)
-{
-	char type = '=';
-	if (chan->modes & IRC_CHAN_MODE_SECRET)
-		type = '@';
-	else if (chan->modes & IRC_CHAN_MODE_PRIVATE)
-		type = '*';
-
-	bool on_channel = channel_get_user (chan, c);
-	struct strv nicks = strv_make ();
-	for (struct channel_user *iter = chan->users; iter; iter = iter->next)
-	{
-		if (!on_channel && (iter->c->mode & IRC_USER_MODE_INVISIBLE))
-			continue;
-		if (used_nicks)
-			str_map_set (used_nicks, iter->c->nickname, (void *) 1);
-		strv_append_owned (&nicks,
-			irc_make_rpl_namreply_item (c, iter->c, iter));
-	}
-
-	irc_send_reply_vector (c, IRC_RPL_NAMREPLY,
-		nicks.vector, type, chan->name, "");
-	strv_free (&nicks);
-}
-
-static void
-irc_send_disassociated_names (struct client *c, struct str_map *used)
-{
-	struct strv nicks = strv_make ();
-	struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
-	struct client *target;
-	while ((target = str_map_iter_next (&iter)))
-	{
-		if ((target->mode & IRC_USER_MODE_INVISIBLE)
-		 || str_map_find (used, target->nickname))
-			continue;
-		strv_append_owned (&nicks,
-			irc_make_rpl_namreply_item (c, target, NULL));
-	}
-
-	if (nicks.len)
-		irc_send_reply_vector (c, IRC_RPL_NAMREPLY,
-			nicks.vector, '*', "*", "");
-	strv_free (&nicks);
-}
-
-static void
-irc_handle_names (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-
-	struct channel *chan;
-	if (msg->params.len == 0)
-	{
-		struct str_map used = str_map_make (NULL);
-		used.key_xfrm = irc_strxfrm;
-
-		struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
-		while ((chan = str_map_iter_next (&iter)))
-			if (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
-			 || channel_get_user (chan, c))
-				irc_send_rpl_namreply (c, chan, &used);
-
-		// Also send all visible users we haven't listed yet
-		irc_send_disassociated_names (c, &used);
-		str_map_free (&used);
-
-		irc_send_reply (c, IRC_RPL_ENDOFNAMES, "*");
-	}
-	else
-	{
-		struct strv channels = strv_make ();
-		cstr_split (msg->params.vector[0], ",", true, &channels);
-		for (size_t i = 0; i < channels.len; i++)
-			if ((chan = str_map_find (&c->ctx->channels, channels.vector[i]))
-			 && (!(chan->modes & IRC_CHAN_MODE_SECRET)
-			 || channel_get_user (chan, c)))
-			{
-				irc_send_rpl_namreply (c, chan, NULL);
-				irc_send_reply (c, IRC_RPL_ENDOFNAMES, channels.vector[i]);
-			}
-		strv_free (&channels);
-	}
-}
-
-static void
-irc_send_rpl_whoreply (struct client *c, const struct channel *chan,
-	const struct client *target)
-{
-	struct str chars = str_make ();
-	str_append_c (&chars, target->away_message ? 'G' : 'H');
-	if (target->mode & IRC_USER_MODE_OPERATOR)
-		str_append_c (&chars, '*');
-
-	struct channel_user *user;
-	if (chan && (user = channel_get_user (chan, target)))
-		irc_append_prefixes (c, user, &chars);
-
-	irc_send_reply (c, IRC_RPL_WHOREPLY, chan ? chan->name : "*",
-		target->username, target->hostname, target->ctx->server_name,
-		target->nickname, chars.str, 0 /* hop count */, target->realname);
-	str_free (&chars);
-}
-
-static void
-irc_match_send_rpl_whoreply (struct client *c, struct client *target,
-	const char *mask)
-{
-	bool is_roommate = false;
-	struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
-	struct channel *chan;
-	while ((chan = str_map_iter_next (&iter)))
-		if (channel_get_user (chan, target) && channel_get_user (chan, c))
-		{
-			is_roommate = true;
-			break;
-		}
-	if ((target->mode & IRC_USER_MODE_INVISIBLE) && !is_roommate)
-		return;
-
-	if (irc_fnmatch (mask, target->hostname)
-	 && irc_fnmatch (mask, target->nickname)
-	 && irc_fnmatch (mask, target->realname)
-	 && irc_fnmatch (mask, c->ctx->server_name))
-		return;
-
-	// Try to find a channel they're on that's visible to us
-	struct channel *user_chan = NULL;
-	iter = str_map_iter_make (&c->ctx->channels);
-	while ((chan = str_map_iter_next (&iter)))
-		if (channel_get_user (chan, target)
-		 && (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
-			|| channel_get_user (chan, c)))
-		{
-			user_chan = chan;
-			break;
-		}
-	irc_send_rpl_whoreply (c, user_chan, target);
-}
-
-static void
-irc_handle_who (const struct irc_message *msg, struct client *c)
-{
-	bool only_ops = msg->params.len > 1 && !strcmp (msg->params.vector[1], "o");
-
-	const char *shown_mask = msg->params.vector[0], *used_mask;
-	if (!shown_mask)
-		used_mask = shown_mask = "*";
-	else if (!strcmp (shown_mask, "0"))
-		used_mask = "*";
-	else
-		used_mask = shown_mask;
-
-	struct channel *chan;
-	if ((chan = str_map_find (&c->ctx->channels, used_mask)))
-	{
-		bool on_chan = !!channel_get_user (chan, c);
-		if (on_chan || !(chan->modes & IRC_CHAN_MODE_SECRET))
-			for (struct channel_user *iter = chan->users;
-				iter; iter = iter->next)
-			{
-				if ((on_chan || !(iter->c->mode & IRC_USER_MODE_INVISIBLE))
-				 && (!only_ops || (iter->c->mode & IRC_USER_MODE_OPERATOR)))
-					irc_send_rpl_whoreply (c, chan, iter->c);
-			}
-	}
-	else
-	{
-		struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
-		struct client *target;
-		while ((target = str_map_iter_next (&iter)))
-			if (!only_ops || (target->mode & IRC_USER_MODE_OPERATOR))
-				irc_match_send_rpl_whoreply (c, target, used_mask);
-	}
-	irc_send_reply (c, IRC_RPL_ENDOFWHO, shown_mask);
-}
-
-static void
-irc_send_whois_reply (struct client *c, const struct client *target)
-{
-	const char *nick = target->nickname;
-	irc_send_reply (c, IRC_RPL_WHOISUSER, nick,
-		target->username, target->hostname, target->realname);
-	irc_send_reply (c, IRC_RPL_WHOISSERVER, nick, target->ctx->server_name,
-		str_map_find (&c->ctx->config, "server_info"));
-	if (target->mode & IRC_USER_MODE_OPERATOR)
-		irc_send_reply (c, IRC_RPL_WHOISOPERATOR, nick);
-	irc_send_reply (c, IRC_RPL_WHOISIDLE, nick,
-		(int) (time (NULL) - target->last_active));
-	if (target->away_message)
-		irc_send_reply (c, IRC_RPL_AWAY, nick, target->away_message);
-
-	struct strv channels = strv_make ();
-
-	struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
-	struct channel *chan;
-	struct channel_user *channel_user;
-	while ((chan = str_map_iter_next (&iter)))
-		if ((channel_user = channel_get_user (chan, target))
-		 && (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
-			|| channel_get_user (chan, c)))
-		{
-			struct str item = str_make ();
-			if (channel_user->modes & IRC_CHAN_MODE_OPERATOR)
-				str_append_c (&item, '@');
-			else if (channel_user->modes & IRC_CHAN_MODE_VOICE)
-				str_append_c (&item, '+');
-			str_append (&item, chan->name);
-			strv_append_owned (&channels, str_steal (&item));
-		}
-
-	irc_send_reply_vector (c, IRC_RPL_WHOISCHANNELS, channels.vector, nick, "");
-	strv_free (&channels);
-
-	irc_send_reply (c, IRC_RPL_ENDOFWHOIS, nick);
-}
-
-static void
-irc_handle_whois (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
-	struct strv masks = strv_make ();
-	const char *masks_str = msg->params.vector[msg->params.len > 1];
-	cstr_split (masks_str, ",", true, &masks);
-	for (size_t i = 0; i < masks.len; i++)
-	{
-		const char *mask = masks.vector[i];
-		struct client *target;
-		if (!strpbrk (mask, "*?"))
-		{
-			if (!(target = str_map_find (&c->ctx->users, mask)))
-				irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask);
-			else
-				irc_send_whois_reply (c, target);
-		}
-		else
-		{
-			struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
-			bool found = false;
-			while ((target = str_map_iter_next (&iter)))
-				if (!irc_fnmatch (mask, target->nickname))
-				{
-					irc_send_whois_reply (c, target);
-					found = true;
-				}
-			if (!found)
-				irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask);
-		}
-	}
-	strv_free (&masks);
-}
-
-static void
-irc_handle_whowas (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-	if (msg->params.len > 2 && !irc_is_this_me (c->ctx, msg->params.vector[2]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[2]);
-	// The "count" parameter is ignored, we only store one entry for a nick
-
-	struct strv nicks = strv_make ();
-	cstr_split (msg->params.vector[0], ",", true, &nicks);
-
-	for (size_t i = 0; i < nicks.len; i++)
-	{
-		const char *nick = nicks.vector[i];
-		struct whowas_info *info = str_map_find (&c->ctx->whowas, nick);
-		if (!info)
-			irc_send_reply (c, IRC_ERR_WASNOSUCHNICK, nick);
-		else
-		{
-			irc_send_reply (c, IRC_RPL_WHOWASUSER, nick,
-				info->username, info->hostname, info->realname);
-			irc_send_reply (c, IRC_RPL_WHOISSERVER, nick, c->ctx->server_name,
-				str_map_find (&c->ctx->config, "server_info"));
-		}
-		irc_send_reply (c, IRC_RPL_ENDOFWHOWAS, nick);
-	}
-	strv_free (&nicks);
-}
-
-static void
-irc_send_rpl_topic (struct client *c, struct channel *chan)
-{
-	if (!*chan->topic)
-		irc_send_reply (c, IRC_RPL_NOTOPIC, chan->name);
-	else
-	{
-		irc_send_reply (c, IRC_RPL_TOPIC, chan->name, chan->topic);
-		irc_send_reply (c, IRC_RPL_TOPICWHOTIME,
-			chan->name, chan->topic_who, (long long) chan->topic_time);
-	}
-}
-
-static void
-irc_handle_topic (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	const char *target = msg->params.vector[0];
-	struct channel *chan = str_map_find (&c->ctx->channels, target);
-	if (!chan)
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, target);
-
-	if (msg->params.len < 2)
-	{
-		irc_send_rpl_topic (c, chan);
-		return;
-	}
-
-	struct channel_user *user = channel_get_user (chan, c);
-	if (!user)
-		RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, target);
-
-	if ((chan->modes & IRC_CHAN_MODE_PROTECTED_TOPIC)
-	 && !(user->modes & IRC_CHAN_MODE_OPERATOR))
-		RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, target);
-
-	cstr_set (&chan->topic, xstrdup (msg->params.vector[1]));
-	cstr_set (&chan->topic_who, xstrdup_printf
-		("%s!%s@%s", c->nickname, c->username, c->hostname));
-	chan->topic_time = time (NULL);
-
-	char *message = xstrdup_printf (":%s!%s@%s TOPIC %s :%s",
-		c->nickname, c->username, c->hostname, target, chan->topic);
-	irc_channel_multicast (chan, message, NULL);
-	free (message);
-}
-
-static void
-irc_try_part (struct client *c, const char *channel_name, const char *reason)
-{
-	if (!reason)
-		reason = c->nickname;
-
-	struct channel *chan;
-	if (!(chan = str_map_find (&c->ctx->channels, channel_name)))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, channel_name);
-
-	struct channel_user *user;
-	if (!(user = channel_get_user (chan, c)))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
-
-	char *message = xstrdup_printf (":%s!%s@%s PART %s :%s",
-		c->nickname, c->username, c->hostname, channel_name, reason);
-	if (!(chan->modes & IRC_CHAN_MODE_QUIET))
-		irc_channel_multicast (chan, message, NULL);
-	else
-		client_send (c, "%s", message);
-	free (message);
-
-	channel_remove_user (chan, user);
-	irc_channel_destroy_if_empty (c->ctx, chan);
-}
-
-static void
-irc_part_all_channels (struct client *c)
-{
-	// We have to be careful here, the channel might get destroyed
-	struct str_map_unset_iter iter =
-		str_map_unset_iter_make (&c->ctx->channels);
-
-	struct channel *chan;
-	while ((chan = str_map_unset_iter_next (&iter)))
-		if (channel_get_user (chan, c))
-			irc_try_part (c, chan->name, NULL);
-	str_map_unset_iter_free (&iter);
-}
-
-static void
-irc_handle_part (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	const char *reason = msg->params.len > 1 ? msg->params.vector[1] : NULL;
-	struct strv channels = strv_make ();
-	cstr_split (msg->params.vector[0], ",", true, &channels);
-	for (size_t i = 0; i < channels.len; i++)
-		irc_try_part (c, channels.vector[i], reason);
-	strv_free (&channels);
-}
-
-static void
-irc_try_kick (struct client *c, const char *channel_name, const char *nick,
-	const char *reason)
-{
-	struct channel *chan;
-	if (!(chan = str_map_find (&c->ctx->channels, channel_name)))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, channel_name);
-
-	struct channel_user *user;
-	if (!(user = channel_get_user (chan, c)))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
-	if (!(user->modes & IRC_CHAN_MODE_OPERATOR))
-		RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
-
-	struct client *client;
-	if (!(client = str_map_find (&c->ctx->users, nick))
-	 || !(user = channel_get_user (chan, client)))
-		RETURN_WITH_REPLY (c, IRC_ERR_USERNOTINCHANNEL, nick, channel_name);
-
-	char *message = xstrdup_printf (":%s!%s@%s KICK %s %s :%s",
-		c->nickname, c->username, c->hostname, channel_name, nick, reason);
-	if (!(chan->modes & IRC_CHAN_MODE_QUIET))
-		irc_channel_multicast (chan, message, NULL);
-	else
-		client_send (c, "%s", message);
-	free (message);
-
-	channel_remove_user (chan, user);
-	irc_channel_destroy_if_empty (c->ctx, chan);
-}
-
-static void
-irc_handle_kick (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 2)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	const char *reason = c->nickname;
-	if (msg->params.len > 2)
-		reason = msg->params.vector[2];
-
-	struct strv channels = strv_make ();
-	cstr_split (msg->params.vector[0], ",", true, &channels);
-	struct strv users = strv_make ();
-	cstr_split (msg->params.vector[1], ",", true, &users);
-
-	if (channels.len == 1)
-		for (size_t i = 0; i < users.len; i++)
-			irc_try_kick (c, channels.vector[0], users.vector[i], reason);
-	else
-		for (size_t i = 0; i < channels.len && i < users.len; i++)
-			irc_try_kick (c, channels.vector[i], users.vector[i], reason);
-
-	strv_free (&channels);
-	strv_free (&users);
-}
-
-static void
-irc_send_invite_notifications
-	(struct channel *chan, struct client *c, struct client *target)
-{
-	for (struct channel_user *iter = chan->users; iter; iter = iter->next)
-		if (iter->c != target && iter->c->caps_enabled & IRC_CAP_INVITE_NOTIFY)
-			client_send (iter->c, ":%s!%s@%s INVITE %s %s",
-				c->nickname, c->username, c->hostname,
-				target->nickname, chan->name);
-}
-
-static void
-irc_handle_invite (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 2)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	const char *target       = msg->params.vector[0];
-	const char *channel_name = msg->params.vector[1];
-
-	struct client *client = str_map_find (&c->ctx->users, target);
-	if (!client)
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, target);
-
-	struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
-	if (chan)
-	{
-		struct channel_user *inviting_user;
-		if (!(inviting_user = channel_get_user (chan, c)))
-			RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
-		if (channel_get_user (chan, client))
-			RETURN_WITH_REPLY (c, IRC_ERR_USERONCHANNEL, target, channel_name);
-
-		if ((inviting_user->modes & IRC_CHAN_MODE_OPERATOR))
-			str_map_set (&client->invites, channel_name, (void *) 1);
-		else if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY))
-			RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
-
-		// It's not specified when and how we should send out invite-notify
-		if (chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
-			irc_send_invite_notifications (chan, c, client);
-	}
-
-	client_send (client, ":%s!%s@%s INVITE %s %s",
-		c->nickname, c->username, c->hostname, client->nickname, channel_name);
-	if (client->away_message)
-		irc_send_reply (c, IRC_RPL_AWAY,
-			client->nickname, client->away_message);
-	irc_send_reply (c, IRC_RPL_INVITING, client->nickname, channel_name);
-}
-
-static void
-irc_try_join (struct client *c, const char *channel_name, const char *key)
-{
-	struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
-	unsigned user_mode = 0;
-	if (!chan)
-	{
-		if (irc_validate_channel_name (channel_name) != VALIDATION_OK)
-			RETURN_WITH_REPLY (c, IRC_ERR_BADCHANMASK, channel_name);
-		chan = irc_channel_create (c->ctx, channel_name);
-		user_mode = IRC_CHAN_MODE_OPERATOR;
-	}
-	else if (channel_get_user (chan, c))
-		return;
-
-	bool invited_by_chanop = !!str_map_find (&c->invites, channel_name);
-	if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
-	 && !client_in_mask_list (c, &chan->invite_list)
-	 && !invited_by_chanop)
-		RETURN_WITH_REPLY (c, IRC_ERR_INVITEONLYCHAN, channel_name);
-	if (chan->key && (!key || strcmp (key, chan->key)))
-		RETURN_WITH_REPLY (c, IRC_ERR_BADCHANNELKEY, channel_name);
-	if (chan->user_limit != -1
-	 && channel_user_count (chan) >= (size_t) chan->user_limit)
-		RETURN_WITH_REPLY (c, IRC_ERR_CHANNELISFULL, channel_name);
-	if (client_in_mask_list (c, &chan->ban_list)
-	 && !client_in_mask_list (c, &chan->exception_list)
-	 && !invited_by_chanop)
-		RETURN_WITH_REPLY (c, IRC_ERR_BANNEDFROMCHAN, channel_name);
-
-	// Destroy any invitation as there's no other way to get rid of it
-	str_map_set (&c->invites, channel_name, NULL);
-
-	channel_add_user (chan, c)->modes = user_mode;
-
-	char *message = xstrdup_printf (":%s!%s@%s JOIN %s",
-		c->nickname, c->username, c->hostname, channel_name);
-	if (!(chan->modes & IRC_CHAN_MODE_QUIET))
-		irc_channel_multicast (chan, message, NULL);
-	else
-		client_send (c, "%s", message);
-	free (message);
-
-	irc_send_rpl_topic (c, chan);
-	irc_send_rpl_namreply (c, chan, NULL);
-	irc_send_reply (c, IRC_RPL_ENDOFNAMES, chan->name);
-}
-
-static void
-irc_handle_join (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	if (!strcmp (msg->params.vector[0], "0"))
-	{
-		irc_part_all_channels (c);
-		return;
-	}
-
-	struct strv channels = strv_make ();
-	cstr_split (msg->params.vector[0], ",", true, &channels);
-	struct strv keys = strv_make ();
-	if (msg->params.len > 1)
-		cstr_split (msg->params.vector[1], ",", true, &keys);
-
-	for (size_t i = 0; i < channels.len; i++)
-		irc_try_join (c, channels.vector[i],
-			i < keys.len ? keys.vector[i] : NULL);
-
-	strv_free (&channels);
-	strv_free (&keys);
-}
-
-static void
-irc_handle_summon (const struct irc_message *msg, struct client *c)
-{
-	(void) msg;
-	irc_send_reply (c, IRC_ERR_SUMMONDISABLED);
-}
-
-static void
-irc_handle_users (const struct irc_message *msg, struct client *c)
-{
-	(void) msg;
-	irc_send_reply (c, IRC_ERR_USERSDISABLED);
-}
-
-static void
-irc_handle_away (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-	{
-		cstr_set (&c->away_message, NULL);
-		irc_send_reply (c, IRC_RPL_UNAWAY);
-	}
-	else
-	{
-		cstr_set (&c->away_message, xstrdup (msg->params.vector[0]));
-		irc_send_reply (c, IRC_RPL_NOWAWAY);
-	}
-}
-
-static void
-irc_handle_ison (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 1)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
-	struct str result = str_make ();
-	const char *nick;
-	if (str_map_find (&c->ctx->users, (nick = msg->params.vector[0])))
-		str_append (&result, nick);
-	for (size_t i = 1; i < msg->params.len; i++)
-		if (str_map_find (&c->ctx->users, (nick = msg->params.vector[i])))
-			str_append_printf (&result, " %s", nick);
-
-	irc_send_reply (c, IRC_RPL_ISON, result.str);
-	str_free (&result);
-}
-
-static void
-irc_handle_admin (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-	irc_send_reply (c, IRC_ERR_NOADMININFO, c->ctx->server_name);
-}
-
-static void
-irc_handle_stats_links (struct client *c, const struct irc_message *msg)
-{
-	// There is only an "l" query in RFC 2812 but we cannot link,
-	// so instead we provide the "L" query giving information for all users
-	const char *filter = NULL;
-	if (msg->params.len > 1)
-		filter = msg->params.vector[1];
-
-	for (struct client *iter = c->ctx->clients; iter; iter = iter->next)
-	{
-		if (filter && irc_strcmp (iter->nickname, filter))
-			continue;
-		irc_send_reply (c, IRC_RPL_STATSLINKINFO,
-			iter->address,           // linkname
-			iter->write_buffer.len,  // sendq
-			iter->n_sent_messages,     iter->sent_bytes     / 1024,
-			iter->n_received_messages, iter->received_bytes / 1024,
-			(long long) (time (NULL) - iter->opened));
-	}
-}
-
-static void
-irc_handle_stats_commands (struct client *c)
-{
-	struct str_map_iter iter = str_map_iter_make (&c->ctx->handlers);
-	struct irc_command *handler;
-	while ((handler = str_map_iter_next (&iter)))
-	{
-		if (!handler->n_received)
-			continue;
-		irc_send_reply (c, IRC_RPL_STATSCOMMANDS, handler->name,
-			handler->n_received, handler->bytes_received, (size_t) 0);
-	}
-}
-
-static void
-irc_handle_stats_uptime (struct client *c)
-{
-	time_t uptime = time (NULL) - c->ctx->started;
-
-	int days  =  uptime                   / 60 / 60 / 24;
-	int hours = (uptime % (60 * 60 * 24)) / 60 / 60;
-	int mins  = (uptime % (60 * 60))      / 60;
-	int secs  =  uptime %  60;
-
-	irc_send_reply (c, IRC_RPL_STATSUPTIME, days, hours, mins, secs);
-}
-
-static void
-irc_handle_stats (const struct irc_message *msg, struct client *c)
-{
-	char query = 0;
-	if (msg->params.len > 0)
-		query = *msg->params.vector[0];
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-	if (!(c->mode & IRC_USER_MODE_OPERATOR))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
-
-	switch (query)
-	{
-	case 'L': irc_handle_stats_links    (c, msg); break;
-	case 'm': irc_handle_stats_commands (c);      break;
-	case 'u': irc_handle_stats_uptime   (c);      break;
-	}
-
-	irc_send_reply (c, IRC_RPL_ENDOFSTATS, query ? query : '*');
-}
-
-static void
-irc_handle_links (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
-	const char *mask = "*";
-	if (msg->params.len > 0)
-		mask = msg->params.vector[msg->params.len > 1];
-
-	if (!irc_fnmatch (mask, c->ctx->server_name))
-		irc_send_reply (c, IRC_RPL_LINKS, mask,
-			c->ctx->server_name, 0 /* hop count */,
-			str_map_find (&c->ctx->config, "server_info"));
-	irc_send_reply (c, IRC_RPL_ENDOFLINKS, mask);
-}
-
-static void
-irc_handle_kill (const struct irc_message *msg, struct client *c)
-{
-	if (msg->params.len < 2)
-		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-	if (!(c->mode & IRC_USER_MODE_OPERATOR))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
-
-	struct client *target;
-	if (!(target = str_map_find (&c->ctx->users, msg->params.vector[0])))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, msg->params.vector[0]);
-
-	client_send (target, ":%s!%s@%s KILL %s :%s",
-		c->nickname, c->username, c->hostname,
-		target->nickname, msg->params.vector[1]);
-
-	char *reason = xstrdup_printf ("Killed by %s: %s",
-		c->nickname, msg->params.vector[1]);
-	client_close_link (target, reason);
-	free (reason);
-}
-
-static void
-irc_handle_die (const struct irc_message *msg, struct client *c)
-{
-	(void) msg;
-
-	if (!(c->mode & IRC_USER_MODE_OPERATOR))
-		RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
-	if (!c->ctx->quitting)
-		irc_initiate_quit (c->ctx);
-}
-
-// -----------------------------------------------------------------------------
-
-static void
-irc_register_handlers (struct server_context *ctx)
-{
-	// TODO: add an index for IRC_ERR_NOSUCHSERVER validation?
-	// TODO: add a minimal parameter count?
-	// TODO: add a field for oper-only commands?
-	static struct irc_command message_handlers[] =
-	{
-		{ "CAP",      false, irc_handle_cap,      0, 0 },
-		{ "PASS",     false, irc_handle_pass,     0, 0 },
-		{ "NICK",     false, irc_handle_nick,     0, 0 },
-		{ "USER",     false, irc_handle_user,     0, 0 },
-
-		{ "USERHOST", true,  irc_handle_userhost, 0, 0 },
-		{ "LUSERS",   true,  irc_handle_lusers,   0, 0 },
-		{ "MOTD",     true,  irc_handle_motd,     0, 0 },
-		{ "PING",     true,  irc_handle_ping,     0, 0 },
-		{ "PONG",     false, irc_handle_pong,     0, 0 },
-		{ "QUIT",     false, irc_handle_quit,     0, 0 },
-		{ "TIME",     true,  irc_handle_time,     0, 0 },
-		{ "VERSION",  true,  irc_handle_version,  0, 0 },
-		{ "USERS",    true,  irc_handle_users,    0, 0 },
-		{ "SUMMON",   true,  irc_handle_summon,   0, 0 },
-		{ "AWAY",     true,  irc_handle_away,     0, 0 },
-		{ "ADMIN",    true,  irc_handle_admin,    0, 0 },
-		{ "STATS",    true,  irc_handle_stats,    0, 0 },
-		{ "LINKS",    true,  irc_handle_links,    0, 0 },
-
-		{ "MODE",     true,  irc_handle_mode,     0, 0 },
-		{ "PRIVMSG",  true,  irc_handle_privmsg,  0, 0 },
-		{ "NOTICE",   true,  irc_handle_notice,   0, 0 },
-		{ "JOIN",     true,  irc_handle_join,     0, 0 },
-		{ "PART",     true,  irc_handle_part,     0, 0 },
-		{ "KICK",     true,  irc_handle_kick,     0, 0 },
-		{ "INVITE",   true,  irc_handle_invite,   0, 0 },
-		{ "TOPIC",    true,  irc_handle_topic,    0, 0 },
-		{ "LIST",     true,  irc_handle_list,     0, 0 },
-		{ "NAMES",    true,  irc_handle_names,    0, 0 },
-		{ "WHO",      true,  irc_handle_who,      0, 0 },
-		{ "WHOIS",    true,  irc_handle_whois,    0, 0 },
-		{ "WHOWAS",   true,  irc_handle_whowas,   0, 0 },
-		{ "ISON",     true,  irc_handle_ison,     0, 0 },
-
-		{ "KILL",     true,  irc_handle_kill,     0, 0 },
-		{ "DIE",      true,  irc_handle_die,      0, 0 },
-	};
-
-	for (size_t i = 0; i < N_ELEMENTS (message_handlers); i++)
-	{
-		const struct irc_command *cmd = &message_handlers[i];
-		str_map_set (&ctx->handlers, cmd->name, (void *) cmd);
-	}
-}
-
-static void
-irc_process_message (const struct irc_message *msg,
-	const char *raw, void *user_data)
-{
-	struct client *c = user_data;
-	if (c->closing_link)
-		return;
-
-	c->n_received_messages++;
-	c->received_bytes += strlen (raw) + 2;
-
-	if (!flood_detector_check (&c->antiflood))
-	{
-		client_close_link (c, "Excess flood");
-		return;
-	}
-
-	struct irc_command *cmd = str_map_find (&c->ctx->handlers, msg->command);
-	if (!cmd)
-		irc_send_reply (c, IRC_ERR_UNKNOWNCOMMAND, msg->command);
-	else
-	{
-		cmd->n_received++;
-		cmd->bytes_received += strlen (raw) + 2;
-
-		if (cmd->requires_registration && !c->registered)
-			irc_send_reply (c, IRC_ERR_NOTREGISTERED);
-		else
-			cmd->handler (msg, c);
-	}
-}
-
-// --- Network I/O -------------------------------------------------------------
-
-static bool
-irc_try_read (struct client *c)
-{
-	struct str *buf = &c->read_buffer;
-	ssize_t n_read;
-
-	while (true)
-	{
-		str_reserve (buf, 512);
-		n_read = read (c->socket_fd, buf->str + buf->len,
-			buf->alloc - buf->len - 1 /* null byte */);
-
-		if (n_read > 0)
-		{
-			buf->str[buf->len += n_read] = '\0';
-			// TODO: discard characters above the 512 character limit
-			irc_process_buffer (buf, irc_process_message, c);
-			continue;
-		}
-		if (n_read == 0)
-		{
-			client_kill (c, NULL);
-			return false;
-		}
-
-		if (errno == EAGAIN)
-			return true;
-		if (errno == EINTR)
-			continue;
-
-		print_debug ("%s: %s: %s", __func__, "read", strerror (errno));
-		client_kill (c, strerror (errno));
-		return false;
-	}
-}
-
-static bool
-irc_try_read_tls (struct client *c)
-{
-	if (c->ssl_tx_want_rx)
-		return true;
-
-	struct str *buf = &c->read_buffer;
-	c->ssl_rx_want_tx = false;
-	while (true)
-	{
-		str_reserve (buf, 512);
-		ERR_clear_error ();
-		int n_read = SSL_read (c->ssl, buf->str + buf->len,
-			buf->alloc - buf->len - 1 /* null byte */);
-
-		const char *error_info = NULL;
-		switch (xssl_get_error (c->ssl, n_read, &error_info))
-		{
-		case SSL_ERROR_NONE:
-			buf->str[buf->len += n_read] = '\0';
-			// TODO: discard characters above the 512 character limit
-			irc_process_buffer (buf, irc_process_message, c);
-			continue;
-		case SSL_ERROR_ZERO_RETURN:
-			client_kill (c, NULL);
-			return false;
-		case SSL_ERROR_WANT_READ:
-			return true;
-		case SSL_ERROR_WANT_WRITE:
-			c->ssl_rx_want_tx = true;
-			return true;
-		case XSSL_ERROR_TRY_AGAIN:
-			continue;
-		default:
-			print_debug ("%s: %s: %s", __func__, "SSL_read", error_info);
-			client_kill (c, error_info);
-			return false;
-		}
-	}
-}
-
-static bool
-irc_try_write (struct client *c)
-{
-	struct str *buf = &c->write_buffer;
-	ssize_t n_written;
-
-	while (buf->len)
-	{
-		n_written = write (c->socket_fd, buf->str, buf->len);
-		if (n_written >= 0)
-		{
-			str_remove_slice (buf, 0, n_written);
-			continue;
-		}
-
-		if (errno == EAGAIN)
-			return true;
-		if (errno == EINTR)
-			continue;
-
-		print_debug ("%s: %s: %s", __func__, "write", strerror (errno));
-		client_kill (c, strerror (errno));
-		return false;
-	}
-	return true;
-}
-
-static bool
-irc_try_write_tls (struct client *c)
-{
-	if (c->ssl_rx_want_tx)
-		return true;
-
-	struct str *buf = &c->write_buffer;
-	c->ssl_tx_want_rx = false;
-	while (buf->len)
-	{
-		ERR_clear_error ();
-		int n_written = SSL_write (c->ssl, buf->str, buf->len);
-
-		const char *error_info = NULL;
-		switch (xssl_get_error (c->ssl, n_written, &error_info))
-		{
-		case SSL_ERROR_NONE:
-			str_remove_slice (buf, 0, n_written);
-			continue;
-		case SSL_ERROR_ZERO_RETURN:
-			client_kill (c, NULL);
-			return false;
-		case SSL_ERROR_WANT_WRITE:
-			return true;
-		case SSL_ERROR_WANT_READ:
-			c->ssl_tx_want_rx = true;
-			return true;
-		case XSSL_ERROR_TRY_AGAIN:
-			continue;
-		default:
-			print_debug ("%s: %s: %s", __func__, "SSL_write", error_info);
-			client_kill (c, error_info);
-			return false;
-		}
-	}
-	return true;
-}
-
-// -----------------------------------------------------------------------------
-
-static bool
-irc_autodetect_tls (struct client *c)
-{
-	// Trivial SSL/TLS autodetection.  The first block of data returned by
-	// recv() must be at least three bytes long for this to work reliably,
-	// but that should not pose a problem in practice.
-	//
-	// SSL2:      1xxx xxxx | xxxx xxxx |    <1>
-	//               (message length)  (client hello)
-	// SSL3/TLS:    <22>    |    <3>    | xxxx xxxx
-	//           (handshake)|  (protocol version)
-	//
-	// Such byte sequences should never occur at the beginning of regular IRC
-	// communication, which usually begins with USER/NICK/PASS/SERVICE.
-
-	char buf[3];
-start:
-	switch (recv (c->socket_fd, buf, sizeof buf, MSG_PEEK))
-	{
-	case 3:
-		if ((buf[0] & 0x80) && buf[2] == 1)
-			return true;
-		// Fall-through
-	case 2:
-		if (buf[0] == 22 && buf[1] == 3)
-			return true;
-		break;
-	case 1:
-		if (buf[0] == 22)
-			return true;
-		break;
-	case 0:
-		break;
-	default:
-		if (errno == EINTR)
-			goto start;
-	}
-	return false;
-}
-
-static bool
-client_initialize_tls (struct client *c)
-{
-	const char *error_info = NULL;
-	if (!c->ctx->ssl_ctx)
-	{
-		error_info = "TLS support disabled";
-		goto error_ssl_1;
-	}
-
-	ERR_clear_error ();
-
-	c->ssl = SSL_new (c->ctx->ssl_ctx);
-	if (!c->ssl)
-		goto error_ssl_2;
-	if (!SSL_set_fd (c->ssl, c->socket_fd))
-		goto error_ssl_3;
-
-	SSL_set_accept_state (c->ssl);
-	return true;
-
-error_ssl_3:
-	SSL_free (c->ssl);
-	c->ssl = NULL;
-error_ssl_2:
-	error_info = xerr_describe_error ();
-error_ssl_1:
-	print_debug ("could not initialize TLS for %s: %s", c->address, error_info);
-	return false;
-}
-
-// -----------------------------------------------------------------------------
-
-static void
-on_client_ready (const struct pollfd *pfd, void *user_data)
-{
-	struct client *c = user_data;
-	if (!c->initialized)
-	{
-		hard_assert (pfd->events == POLLIN);
-		if (irc_autodetect_tls (c) && !client_initialize_tls (c))
-		{
-			client_kill (c, NULL);
-			return;
-		}
-		c->initialized = true;
-		client_set_ping_timer (c);
-	}
-
-	if (c->ssl)
-	{
-		// Reads may want to write, writes may want to read, poll() may
-		// return unexpected things in `revents'... let's try both
-		if (!irc_try_read_tls (c) || !irc_try_write_tls (c))
-			return;
-	}
-	else if (!irc_try_read (c) || !irc_try_write (c))
-		return;
-
-	client_update_poller (c, pfd);
-
-	// The purpose of the `closing_link' state is to transfer the `ERROR'
-	if (c->closing_link && !c->half_closed && !c->write_buffer.len)
-	{
-		// To make sure the client has received our ERROR message, we must
-		// first half-close the connection, otherwise it could happen that they
-		// receive a RST from our TCP stack first when we receive further data
-
-		// We only send the "close notify" alert if libssl can write to the
-		// socket at this moment.  All the other data has been already written,
-		// though, and the client will receive a TCP half-close as usual, so
-		// it's not that important if the alert actually gets through.
-		if (c->ssl)
-			(void) SSL_shutdown (c->ssl);
-
-		// Either the shutdown succeeds, in which case we set a flag so that
-		// we don't retry this action and wait until we get an EOF, or it fails
-		// and we just kill the client straight away
-		if (!shutdown (c->socket_fd, SHUT_WR))
-			c->half_closed = true;
-		else
-			client_kill (c, NULL);
-	}
-}
-
-static void
-client_update_poller (struct client *c, const struct pollfd *pfd)
-{
-	// We must not poll for writing when the connection hasn't been initialized
-	int new_events = POLLIN;
-	if (c->ssl)
-	{
-		if (c->write_buffer.len || c->ssl_rx_want_tx)
-			new_events |= POLLOUT;
-
-		// While we're waiting for an opposite event, we ignore the original
-		if (c->ssl_rx_want_tx)  new_events &= ~POLLIN;
-		if (c->ssl_tx_want_rx)  new_events &= ~POLLOUT;
-	}
-	else if (c->initialized && c->write_buffer.len)
-		new_events |= POLLOUT;
-
-	hard_assert (new_events != 0);
-	if (!pfd || pfd->events != new_events)
-		poller_fd_set (&c->socket_event, new_events);
-}
-
-static void
-client_finish_connection (struct client *c)
-{
-	c->gni = NULL;
-
-	c->address = format_host_port_pair (c->hostname, c->port);
-	print_debug ("accepted connection from %s", c->address);
-
-	client_update_poller (c, NULL);
-	client_set_kill_timer (c);
-}
-
-static void
-on_client_gni_resolved (int result, char *host, char *port, void *user_data)
-{
-	struct client *c = user_data;
-
-	if (result)
-		print_debug ("%s: %s", "getnameinfo", gai_strerror (result));
-	else
-	{
-		cstr_set (&c->hostname, xstrdup (host));
-		(void) port;
-	}
-
-	poller_timer_reset (&c->gni_timer);
-	client_finish_connection (c);
-}
-
-static void
-on_client_gni_timer (struct client *c)
-{
-	async_cancel (&c->gni->async);
-	client_finish_connection (c);
-}
-
-static bool
-irc_try_fetch_client (struct server_context *ctx, int listen_fd)
-{
-	// XXX: `struct sockaddr_storage' is not the most portable thing
-	struct sockaddr_storage peer;
-	socklen_t peer_len = sizeof peer;
-
-	int fd = accept (listen_fd, (struct sockaddr *) &peer, &peer_len);
-	if (fd == -1)
-	{
-		if (errno == EAGAIN || errno == EWOULDBLOCK)
-			return false;
-		if (errno == EINTR)
-			return true;
-
-		if (errno == EBADF
-		 || errno == EINVAL
-		 || errno == ENOTSOCK
-		 || errno == EOPNOTSUPP)
-			print_fatal ("%s: %s", "accept", strerror (errno));
-
-		// OS kernels may return a wide range of unforeseeable errors.
-		// Assuming that they're either transient or caused by
-		// a connection that we've just extracted from the queue.
-		print_warning ("%s: %s", "accept", strerror (errno));
-		return true;
-	}
-
-	hard_assert (peer_len <= sizeof peer);
-	set_blocking (fd, false);
-
-	// A little bit questionable once the traffic gets high enough (IMO),
-	// but it reduces silly latencies that we don't need because we already
-	// do buffer our output
-	int yes = 1;
-	soft_assert (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY,
-		&yes, sizeof yes) != -1);
-
-	if (ctx->max_connections != 0 && ctx->n_clients >= ctx->max_connections)
-	{
-		print_debug ("connection limit reached, refusing connection");
-		close (fd);
-		return true;
-	}
-
-	char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
-	int err = getnameinfo ((struct sockaddr *) &peer, peer_len,
-		host, sizeof host, port, sizeof port, NI_NUMERICHOST | NI_NUMERICSERV);
-	if (err)
-		print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
-
-	struct client *c = client_new ();
-	c->ctx = ctx;
-	c->opened = time (NULL);
-	c->socket_fd = fd;
-	c->hostname = xstrdup (host);
-	c->port = xstrdup (port);
-	c->last_active = time (NULL);
-	LIST_PREPEND (ctx->clients, c);
-	ctx->n_clients++;
-
-	c->socket_event = poller_fd_make (&c->ctx->poller, c->socket_fd);
-	c->socket_event.dispatcher = (poller_fd_fn) on_client_ready;
-	c->socket_event.user_data = c;
-
-	c->kill_timer = poller_timer_make (&c->ctx->poller);
-	c->kill_timer.dispatcher = (poller_timer_fn) on_client_kill_timer;
-	c->kill_timer.user_data = c;
-
-	c->timeout_timer = poller_timer_make (&c->ctx->poller);
-	c->timeout_timer.dispatcher = (poller_timer_fn) on_client_timeout_timer;
-	c->timeout_timer.user_data = c;
-
-	c->ping_timer = poller_timer_make (&c->ctx->poller);
-	c->ping_timer.dispatcher = (poller_timer_fn) on_client_ping_timer;
-	c->ping_timer.user_data = c;
-
-	// Resolve the client's hostname first; this is a blocking operation that
-	// depends on the network, so run it asynchronously with some timeout
-	c->gni = async_getnameinfo (&ctx->poller.common.async,
-		(const struct sockaddr *) &peer, peer_len, NI_NUMERICSERV);
-	c->gni->dispatcher = on_client_gni_resolved;
-	c->gni->user_data = c;
-
-	c->gni_timer = poller_timer_make (&c->ctx->poller);
-	c->gni_timer.dispatcher = (poller_timer_fn) on_client_gni_timer;
-	c->gni_timer.user_data = c;
-
-	poller_timer_set (&c->gni_timer, 5000);
-	return true;
-}
-
-static void
-on_irc_client_available (const struct pollfd *pfd, void *user_data)
-{
-	struct server_context *ctx = user_data;
-	while (irc_try_fetch_client (ctx, pfd->fd))
-		;
-}
-
-// --- Application setup -------------------------------------------------------
-
-static int
-irc_ssl_verify_callback (int verify_ok, X509_STORE_CTX *ctx)
-{
-	(void) verify_ok;
-	(void) ctx;
-
-	// RFC 5246: "If the client has sent a certificate with signing ability,
-	// a digitally-signed CertificateVerify message is sent to explicitly
-	// verify possession of the private key in the certificate."
-	//
-	// The handshake will fail if the client doesn't have a matching private
-	// key, see OpenSSL's tls_process_cert_verify(), and the CertificateVerify
-	// message cannot be skipped (except for a case where it doesn't matter).
-	// Thus we're fine checking just the cryptographic hash of the certificate.
-
-	// We only want to provide additional privileges based on the client's
-	// certificate, so let's not terminate the connection because of a failure
-	// (especially since self-signed certificates are likely to be used).
-	return 1;
-}
-
-static void
-irc_ssl_info_callback (const SSL *ssl, int where, int ret)
-{
-	// For debugging only; provides us with the most important information
-
-	struct str s = str_make ();
-	if (where & SSL_CB_LOOP)
-		str_append_printf (&s, "loop (%s) ",
-			SSL_state_string_long (ssl));
-	if (where & SSL_CB_EXIT)
-		str_append_printf (&s, "exit (%d in %s) ", ret,
-			SSL_state_string_long (ssl));
-
-	if (where & SSL_CB_READ)   str_append (&s, "read ");
-	if (where & SSL_CB_WRITE)  str_append (&s, "write ");
-
-	if (where & SSL_CB_ALERT)
-		str_append_printf (&s, "alert (%s: %s) ",
-			SSL_alert_type_string_long (ret),
-			SSL_alert_desc_string_long (ret));
-
-	if (where & SSL_CB_HANDSHAKE_START)  str_append (&s, "handshake start ");
-	if (where & SSL_CB_HANDSHAKE_DONE)   str_append (&s, "handshake done ");
-
-	print_debug ("ssl <%p> %s", ssl, s.str);
-	str_free (&s);
-}
-
-static bool
-irc_initialize_ssl_ctx (struct server_context *ctx,
-	const char *cert_path, const char *key_path, struct error **e)
-{
-	ERR_clear_error ();
-
-	ctx->ssl_ctx = SSL_CTX_new (SSLv23_server_method ());
-	if (!ctx->ssl_ctx)
-	{
-		error_set (e, "%s: %s", "could not initialize TLS",
-			xerr_describe_error ());
-		return false;
-	}
-	SSL_CTX_set_verify (ctx->ssl_ctx,
-		SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, irc_ssl_verify_callback);
-
-	if (g_debug_mode)
-		SSL_CTX_set_info_callback (ctx->ssl_ctx, irc_ssl_info_callback);
-
-	const unsigned char session_id_context[SSL_MAX_SSL_SESSION_ID_LENGTH]
-		= PROGRAM_NAME;
-	(void) SSL_CTX_set_session_id_context (ctx->ssl_ctx,
-		session_id_context, sizeof session_id_context);
-
-	// IRC is not particularly reconnect-heavy, prefer forward secrecy
-	SSL_CTX_set_session_cache_mode (ctx->ssl_ctx, SSL_SESS_CACHE_OFF);
-
-	// Gah, spare me your awkward semantics, I just want to push data!
-	SSL_CTX_set_mode (ctx->ssl_ctx,
-		SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
-
-	// Disable deprecated protocols (see RFC 7568)
-	SSL_CTX_set_options (ctx->ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
-
-	// XXX: perhaps we should read the files ourselves for better messages
-	const char *ciphers = str_map_find (&ctx->config, "tls_ciphers");
-	if (!SSL_CTX_set_cipher_list (ctx->ssl_ctx, ciphers))
-		error_set (e, "failed to select any cipher from the cipher list");
-	else if (!SSL_CTX_use_certificate_chain_file (ctx->ssl_ctx, cert_path))
-		error_set (e, "%s: %s", "setting the TLS certificate failed",
-			xerr_describe_error ());
-	else if (!SSL_CTX_use_PrivateKey_file
-		(ctx->ssl_ctx, key_path, SSL_FILETYPE_PEM))
-		error_set (e, "%s: %s", "setting the TLS private key failed",
-			xerr_describe_error ());
-	else
-		// TODO: SSL_CTX_check_private_key()?  It has probably already been
-		//   checked by SSL_CTX_use_PrivateKey_file() above.
-		return true;
-
-	SSL_CTX_free (ctx->ssl_ctx);
-	ctx->ssl_ctx = NULL;
-	return false;
-}
-
-static bool
-irc_initialize_tls (struct server_context *ctx, struct error **e)
-{
-	const char *tls_cert = str_map_find (&ctx->config, "tls_cert");
-	const char *tls_key  = str_map_find (&ctx->config, "tls_key");
-
-	// Only try to enable SSL support if the user configures it; it is not
-	// a failure if no one has requested it.
-	if (!tls_cert && !tls_key)
-		return true;
-
-	if (!tls_cert)
-		error_set (e, "no TLS certificate set");
-	else if (!tls_key)
-		error_set (e, "no TLS private key set");
-	if (!tls_cert || !tls_key)
-		return false;
-
-	bool result = false;
-
-	char *cert_path = resolve_filename
-		(tls_cert, resolve_relative_config_filename);
-	char *key_path = resolve_filename
-		(tls_key, resolve_relative_config_filename);
-	if (!cert_path)
-		error_set (e, "%s: %s", "cannot open file", tls_cert);
-	else if (!key_path)
-		error_set (e, "%s: %s", "cannot open file", tls_key);
-	else
-		result = irc_initialize_ssl_ctx (ctx, cert_path, key_path, e);
-
-	free (cert_path);
-	free (key_path);
-	return result;
-}
-
-static bool
-irc_initialize_catalog (struct server_context *ctx, struct error **e)
-{
-	hard_assert (ctx->catalog == (nl_catd) -1);
-	const char *catalog = str_map_find (&ctx->config, "catalog");
-	if (!catalog)
-		return true;
-
-	char *path = resolve_filename (catalog, resolve_relative_config_filename);
-	if (!path)
-	{
-		error_set (e, "%s: %s", "cannot open file", catalog);
-		return false;
-	}
-	ctx->catalog = catopen (path, NL_CAT_LOCALE);
-	free (path);
-
-	if (ctx->catalog == (nl_catd) -1)
-	{
-		error_set (e, "%s: %s",
-			"failed reading the message catalog file", strerror (errno));
-		return false;
-	}
-	return true;
-}
-
-static bool
-irc_initialize_motd (struct server_context *ctx, struct error **e)
-{
-	hard_assert (ctx->motd.len == 0);
-	const char *motd = str_map_find (&ctx->config, "motd");
-	if (!motd)
-		return true;
-
-	char *path = resolve_filename (motd, resolve_relative_config_filename);
-	if (!path)
-	{
-		error_set (e, "%s: %s", "cannot open file", motd);
-		return false;
-	}
-	FILE *fp = fopen (path, "r");
-	free (path);
-
-	if (!fp)
-	{
-		error_set (e, "%s: %s",
-			"failed reading the MOTD file", strerror (errno));
-		return false;
-	}
-
-	struct str line = str_make ();
-	while (read_line (fp, &line))
-		strv_append_owned (&ctx->motd, str_steal (&line));
-	str_free (&line);
-
-	fclose (fp);
-	return true;
-}
-
-static bool
-irc_parse_config_unsigned (const char *name, const char *value, unsigned *out,
-	unsigned long min, unsigned long max, struct error **e)
-{
-	unsigned long ul;
-	hard_assert (value != NULL);
-	if (!xstrtoul (&ul, value, 10) || ul > max || ul < min)
-	{
-		error_set (e, "invalid configuration value for `%s': %s",
-			name, "the number is invalid or out of range");
-		return false;
-	}
-	*out = ul;
-	return true;
-}
-
-/// This function handles values that require validation before their first use,
-/// or some kind of a transformation (such as conversion to an integer) needs
-/// to be done before they can be used directly.
-static bool
-irc_parse_config (struct server_context *ctx, struct error **e)
-{
-#define PARSE_UNSIGNED(name, min, max)                                         \
-	irc_parse_config_unsigned (#name, str_map_find (&ctx->config, #name),      \
-		&ctx->name, min, max, e)
-
-	if (!PARSE_UNSIGNED (ping_interval,   1, UINT_MAX)
-	 || !PARSE_UNSIGNED (max_connections, 0, UINT_MAX))
-		return false;
-
-	bool result = true;
-	struct strv fingerprints = strv_make ();
-	const char *operators = str_map_find (&ctx->config, "operators");
-	if (operators)
-		cstr_split (operators, ",", true, &fingerprints);
-	for (size_t i = 0; i < fingerprints.len; i++)
-	{
-		const char *key = fingerprints.vector[i];
-		if (!irc_is_valid_fingerprint (key))
-		{
-			error_set (e, "invalid configuration value for `%s': %s",
-				"operators", "invalid fingerprint value");
-			result = false;
-			break;
-		}
-		str_map_set (&ctx->operators, key, (void *) 1);
-	}
-	strv_free (&fingerprints);
-	return result;
-}
-
-static bool
-irc_initialize_server_name (struct server_context *ctx, struct error **e)
-{
-	enum validation_result res;
-	const char *server_name = str_map_find (&ctx->config, "server_name");
-	if (server_name)
-	{
-		res = irc_validate_hostname (server_name);
-		if (res != VALIDATION_OK)
-		{
-			error_set (e, "invalid configuration value for `%s': %s",
-				"server_name", irc_validate_to_str (res));
-			return false;
-		}
-		ctx->server_name = xstrdup (server_name);
-	}
-	else
-	{
-		long host_name_max = sysconf (_SC_HOST_NAME_MAX);
-		if (host_name_max <= 0)
-			host_name_max = _POSIX_HOST_NAME_MAX;
-
-		char hostname[host_name_max + 1];
-		if (gethostname (hostname, sizeof hostname))
-		{
-			error_set (e, "%s: %s",
-				"getting the hostname failed", strerror (errno));
-			return false;
-		}
-		res = irc_validate_hostname (hostname);
-		if (res != VALIDATION_OK)
-		{
-			error_set (e,
-				"`%s' is not set and the hostname (`%s') cannot be used: %s",
-				"server_name", hostname, irc_validate_to_str (res));
-			return false;
-		}
-		ctx->server_name = xstrdup (hostname);
-	}
-	return true;
-}
-
-static bool
-irc_lock_pid_file (struct server_context *ctx, struct error **e)
-{
-	const char *path = str_map_find (&ctx->config, "pid_file");
-	if (!path)
-		return true;
-
-	char *resolved = resolve_filename (path, resolve_relative_runtime_filename);
-	bool result = lock_pid_file (resolved, e) != -1;
-	free (resolved);
-	return result;
-}
-
-static int
-irc_listen (struct addrinfo *gai_iter)
-{
-	int fd = socket (gai_iter->ai_family,
-		gai_iter->ai_socktype, gai_iter->ai_protocol);
-	if (fd == -1)
-		return -1;
-	set_cloexec (fd);
-
-	int yes = 1;
-	soft_assert (setsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
-		&yes, sizeof yes) != -1);
-	soft_assert (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
-		&yes, sizeof yes) != -1);
-
-#if defined SOL_IPV6 && defined IPV6_V6ONLY
-	// Make NULL always bind to both IPv4 and IPv6, irrespectively of the order
-	// of results; only INADDR6_ANY seems to be affected by this
-	if (gai_iter->ai_family == AF_INET6)
-		soft_assert (setsockopt (fd, SOL_IPV6, IPV6_V6ONLY,
-			&yes, sizeof yes) != -1);
-#endif
-
-	char host[NI_MAXHOST], port[NI_MAXSERV];
-	host[0] = port[0] = '\0';
-	int err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
-		host, sizeof host, port, sizeof port,
-		NI_NUMERICHOST | NI_NUMERICSERV);
-	if (err)
-		print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
-
-	char *address = format_host_port_pair (host, port);
-	if (bind (fd, gai_iter->ai_addr, gai_iter->ai_addrlen))
-		print_error ("bind to %s failed: %s", address, strerror (errno));
-	else if (listen (fd, 16 /* arbitrary number */))
-		print_error ("listen on %s failed: %s", address, strerror (errno));
-	else
-	{
-		print_status ("listening on %s", address);
-		free (address);
-		return fd;
-	}
-
-	free (address);
-	xclose (fd);
-	return -1;
-}
-
-static void
-irc_listen_resolve (struct server_context *ctx,
-	const char *host, const char *port, struct addrinfo *gai_hints)
-{
-	struct addrinfo *gai_result, *gai_iter;
-	int err = getaddrinfo (host, port, gai_hints, &gai_result);
-	if (err)
-	{
-		char *address = format_host_port_pair (host, port);
-		print_error ("bind to %s failed: %s: %s",
-			address, "getaddrinfo", gai_strerror (err));
-		free (address);
-		return;
-	}
-
-	int fd;
-	for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next)
-	{
-		if (ctx->listen_len == ctx->listen_alloc)
-			break;
-
-		if ((fd = irc_listen (gai_iter)) == -1)
-			continue;
-		set_blocking (fd, false);
-
-		struct poller_fd *event = &ctx->listen_events[ctx->listen_len];
-		*event = poller_fd_make (&ctx->poller, fd);
-		event->dispatcher = (poller_fd_fn) on_irc_client_available;
-		event->user_data = ctx;
-
-		ctx->listen_fds[ctx->listen_len++] = fd;
-		poller_fd_set (event, POLLIN);
-	}
-	freeaddrinfo (gai_result);
-}
-
-static bool
-irc_setup_listen_fds (struct server_context *ctx, struct error **e)
-{
-	const char *bind_host = str_map_find (&ctx->config, "bind_host");
-	const char *bind_port = str_map_find (&ctx->config, "bind_port");
-	hard_assert (bind_port != NULL);  // We have a default value for this
-
-	struct addrinfo gai_hints;
-	memset (&gai_hints, 0, sizeof gai_hints);
-
-	gai_hints.ai_socktype = SOCK_STREAM;
-	gai_hints.ai_flags = AI_PASSIVE;
-
-	struct strv ports = strv_make ();
-	cstr_split (bind_port, ",", true, &ports);
-
-	// For C and simplicity's sake let's assume that the host will resolve
-	// to at most two different addresses: IPv4 and IPv6 in case it is NULL
-	ctx->listen_alloc = ports.len * 2;
-
-	ctx->listen_fds =
-		xcalloc (ctx->listen_alloc, sizeof *ctx->listen_fds);
-	ctx->listen_events =
-		xcalloc (ctx->listen_alloc, sizeof *ctx->listen_events);
-	for (size_t i = 0; i < ports.len; i++)
-		irc_listen_resolve (ctx, bind_host, ports.vector[i], &gai_hints);
-	strv_free (&ports);
-
-	if (!ctx->listen_len)
-	{
-		error_set (e, "%s: %s",
-			"network setup failed", "no ports to listen on");
-		return false;
-	}
-	return true;
-}
-
-// --- Main --------------------------------------------------------------------
-
-static void
-on_signal_pipe_readable (const struct pollfd *fd, struct server_context *ctx)
-{
-	char dummy;
-	(void) read (fd->fd, &dummy, 1);
-
-	if (g_termination_requested && !ctx->quitting)
-		irc_initiate_quit (ctx);
-}
-
-static void
-daemonize (struct server_context *ctx)
-{
-	print_status ("daemonizing...");
-
-	if (chdir ("/"))
-		exit_fatal ("%s: %s", "chdir", strerror (errno));
-
-	// Because of systemd, we need to exit the parent process _after_ writing
-	// a PID file, otherwise our grandchild would receive a SIGTERM
-	int sync_pipe[2];
-	if (pipe (sync_pipe))
-		exit_fatal ("%s: %s", "pipe", strerror (errno));
-
-	pid_t pid;
-	if ((pid = fork ()) < 0)
-		exit_fatal ("%s: %s", "fork", strerror (errno));
-	else if (pid)
-	{
-		// Wait until all write ends of the pipe are closed, which can mean
-		// either success or failure, we don't need to care
-		xclose (sync_pipe[PIPE_WRITE]);
-
-		char dummy;
-		if (read (sync_pipe[PIPE_READ], &dummy, 1) < 0)
-			exit_fatal ("%s: %s", "read", strerror (errno));
-
-		exit (EXIT_SUCCESS);
-	}
-
-	setsid ();
-	signal (SIGHUP, SIG_IGN);
-
-	if ((pid = fork ()) < 0)
-		exit_fatal ("%s: %s", "fork", strerror (errno));
-	else if (pid)
-		exit (EXIT_SUCCESS);
-
-	openlog (PROGRAM_NAME, LOG_NDELAY | LOG_NOWAIT | LOG_PID, 0);
-	g_log_message_real = log_message_syslog;
-
-	// Write the PID file (if so configured) and get rid of the pipe, so that
-	// the read() in our grandparent finally returns zero (no write ends)
-	struct error *e = NULL;
-	if (!irc_lock_pid_file (ctx, &e))
-		exit_fatal ("%s", e->message);
-
-	xclose (sync_pipe[PIPE_READ]);
-	xclose (sync_pipe[PIPE_WRITE]);
-
-	// XXX: we may close our own descriptors this way, crippling ourselves;
-	//   there is no real guarantee that we will start with all three
-	//   descriptors open.  In theory we could try to enumerate the descriptors
-	//   at the start of main().
-	for (int i = 0; i < 3; i++)
-		xclose (i);
-
-	int tty = open ("/dev/null", O_RDWR);
-	if (tty != 0 || dup (0) != 1 || dup (0) != 2)
-		exit_fatal ("failed to reopen FD's: %s", strerror (errno));
-
-	poller_post_fork (&ctx->poller);
-}
-
-int
-main (int argc, char *argv[])
-{
-	// Need to call this first as all string maps depend on it
-	siphash_wrapper_randomize ();
-
-	static const struct opt opts[] =
-	{
-		{ 'd', "debug", NULL, 0, "run in debug mode (do not daemonize)" },
-		{ 'h', "help", NULL, 0, "display this help and exit" },
-		{ 'V', "version", NULL, 0, "output version information and exit" },
-		{ 'w', "write-default-cfg", "FILENAME",
-		  OPT_OPTIONAL_ARG | OPT_LONG_ONLY,
-		  "write a default configuration file and exit" },
-		{ 0, NULL, NULL, 0, NULL }
-	};
-
-	struct opt_handler oh =
-		opt_handler_make (argc, argv, opts, NULL, "IRC daemon.");
-
-	int c;
-	while ((c = opt_handler_get (&oh)) != -1)
-	switch (c)
-	{
-	case 'd':
-		g_debug_mode = true;
-		break;
-	case 'h':
-		opt_handler_usage (&oh, stdout);
-		exit (EXIT_SUCCESS);
-	case 'V':
-		printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
-		exit (EXIT_SUCCESS);
-	case 'w':
-		call_simple_config_write_default (optarg, g_config_table);
-		exit (EXIT_SUCCESS);
-	default:
-		print_error ("wrong options");
-		opt_handler_usage (&oh, stderr);
-		exit (EXIT_FAILURE);
-	}
-
-	opt_handler_free (&oh);
-
-	print_status (PROGRAM_NAME " " PROGRAM_VERSION " starting");
-	setup_signal_handlers ();
-	init_openssl ();
-
-	struct server_context ctx;
-	server_context_init (&ctx);
-	ctx.started = time (NULL);
-	irc_register_handlers (&ctx);
-	irc_register_cap_handlers (&ctx);
-
-	struct error *e = NULL;
-	if (!simple_config_update_from_file (&ctx.config, &e))
-	{
-		print_error ("error loading configuration: %s", e->message);
-		error_free (e);
-		exit (EXIT_FAILURE);
-	}
-
-	ctx.signal_event = poller_fd_make (&ctx.poller, g_signal_pipe[0]);
-	ctx.signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
-	ctx.signal_event.user_data = &ctx;
-	poller_fd_set (&ctx.signal_event, POLLIN);
-
-	if (!irc_initialize_tls (&ctx, &e)
-	 || !irc_initialize_server_name (&ctx, &e)
-	 || !irc_initialize_motd (&ctx, &e)
-	 || !irc_initialize_catalog (&ctx, &e)
-	 || !irc_parse_config (&ctx, &e)
-	 || !irc_setup_listen_fds (&ctx, &e))
-		exit_fatal ("%s", e->message);
-
-	if (!g_debug_mode)
-		daemonize (&ctx);
-	else if (!irc_lock_pid_file (&ctx, &e))
-		exit_fatal ("%s", e->message);
-
-#if OpenBSD >= 201605
-	// This won't be as simple once we decide to implement REHASH
-	if (pledge ("stdio inet dns", NULL))
-		exit_fatal ("%s: %s", "pledge", strerror (errno));
-#endif
-
-	ctx.polling = true;
-	while (ctx.polling)
-		poller_run (&ctx.poller);
-
-	server_context_free (&ctx);
-	return EXIT_SUCCESS;
-}