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/*
* http.c: IRC service detection plugin
*
* Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* 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.
*
*/
#define LIBERTY_WANT_PROTO_IRC
#include "config.h"
#include "../liberty/liberty.c"
#include "../plugin-api.h"
// --- Selected IRC stuff ------------------------------------------------------
#define IRC_MAX_NICKNAME 9 ///< The limit from RFC 2812
#define IRC_RPL_WELCOME 1
#define IRC_RPL_MYINFO 4
// --- Service detection -------------------------------------------------------
static struct plugin_data
{
void *ctx; ///< Application context
struct plugin_api *api; ///< Plugin API vtable
}
g_data;
struct scan_data
{
struct str input; ///< Input buffer
struct unit *u; ///< Scan unit
};
static void *
scan_init (struct service *service, struct unit *u)
{
(void) service;
char nick[IRC_MAX_NICKNAME + 1];
size_t i;
for (i = 0; i < sizeof nick - 1; i++)
nick[i] = 'a' + rand () % ('z' - 'a' + 1);
nick[i] = '\0';
struct str hello;
str_init (&hello);
str_append_printf (&hello,
"NICK %s\r\nUSER %s 8 * :%s\r\n", nick, nick, nick);
g_data.api->unit_write (u, hello.str, hello.len);
str_free (&hello);
struct scan_data *scan = xcalloc (1, sizeof *scan);
str_init (&scan->input);
scan->u = u;
return scan;
}
static void
scan_free (void *handle)
{
struct scan_data *scan = handle;
str_free (&scan->input);
free (scan);
}
static void
on_irc_message (const struct irc_message *msg, const char *raw, void *user_data)
{
(void) raw;
struct scan_data *scan = user_data;
unsigned long code;
if (!irc_strcmp (msg->command, "PING"))
{
// Without this we might be unable to finish registration
struct str pong;
str_init (&pong);
str_append_printf (&pong, "PONG :%s\r\n",
msg->params.len > 0 ? msg->params.vector[0] : "");
g_data.api->unit_write (scan->u, pong.str, pong.len);
}
else if (strlen (msg->command) == 3 && xstrtoul (&code, msg->command, 10))
{
// It looks like we've successfully registered
if (msg->prefix && code == IRC_RPL_WELCOME)
g_data.api->unit_set_success (scan->u, true);
// Extract the server name at least
if (code == IRC_RPL_MYINFO && msg->params.len > 0)
{
char *info = xstrdup_printf ("%s: %s",
"server name", msg->params.vector[1]);
g_data.api->unit_add_info (scan->u, info);
free (info);
g_data.api->unit_abort (scan->u);
}
}
}
static void
on_data (void *handle, const void *data, size_t len)
{
struct scan_data *scan = handle;
str_append_data (&scan->input, data, len);
irc_process_buffer (&scan->input, on_irc_message, scan);
}
static struct service g_irc_service =
{
.name = "IRC",
.flags = SERVICE_SUPPORTS_TLS,
.scan_init = scan_init,
.scan_free = scan_free,
.on_data = on_data,
.on_eof = NULL,
.on_error = NULL,
.on_aborted = NULL
};
static bool
initialize (void *ctx, struct plugin_api *api)
{
g_data = (struct plugin_data) { .ctx = ctx, .api = api };
api->register_service (ctx, &g_irc_service);
return true;
}
struct plugin_info ponymap_plugin_info =
{
.api_version = API_VERSION,
.initialize = initialize
};
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