Implement more of the services

 - SSH: ready for action
 - IRC: ready for action
 - HTTP: needs some work

3 files changed, 128 insertions, 9 deletions

diff --git a/plugins/http.c b/plugins/http.c
index 2b16462..b350fee 100644
--- a/plugins/http.c
+++ b/plugins/http.c
@@ -30,23 +30,38 @@ static struct plugin_data
 }
 g_data;
 
+struct scan_data
+{
+	struct str input;                   ///< Input buffer
+};
+
 static void *
 scan_init (struct unit *u)
 {
-	// TODO
-	return NULL;
+	struct str hello;
+	str_init (&hello);
+	str_append_printf (&hello, "GET / HTTP/1.0\r\n"
+		"Host: %s\r\n\r\n", g_data.api->unit_get_address (u));
+	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);
+	return scan;
 }
 
 static void
 scan_free (void *handle)
 {
-	// TODO
+	struct scan_data *scan = handle;
+	str_free (&scan->input);
+	free (scan);
 }
 
 static void
 on_data (void *handle, struct unit *u, struct str *data)
 {
-	// TODO
+	// TODO: implement a state machine to parse the headers
 }
 
 static struct service g_http_service =
diff --git a/plugins/irc.c b/plugins/irc.c
index 58f594a..7732b73 100644
--- a/plugins/irc.c
+++ b/plugins/irc.c
@@ -191,6 +191,13 @@ irc_fnmatch (const char *pattern, const char *string)
 	return fnmatch (x_pattern, x_string, 0);
 }
 
+// --- Other 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
@@ -200,11 +207,103 @@ static struct plugin_data
 }
 g_data;
 
+struct scan_data
+{
+	struct str input;                   ///< Input buffer
+	struct unit *u;                     ///< Scan unit
+};
+
+static void *
+scan_init (struct unit *u)
+{
+	char nick[IRC_MAX_NICKNAME + 1];
+	for (size_t i = 0; i < sizeof nick - 1; i++)
+		nick[i] = 'a' + rand () % ('z' - 'a' + 1);
+
+	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[0]);
+			g_data.api->unit_add_info (scan->u, info);
+			free (info);
+
+			g_data.api->unit_abort (scan->u);
+		}
+	}
+}
+
+static void
+on_data (void *handle, struct unit *u, struct str *data)
+{
+	(void) u;
+
+	struct scan_data *scan = handle;
+	str_append_str (&scan->input, data);
+	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 };
-	// TODO: register a service
+	api->register_service (ctx, &g_irc_service);
 	return true;
 }
 
diff --git a/plugins/ssh.c b/plugins/ssh.c
index 3a32223..cf18c3c 100644
--- a/plugins/ssh.c
+++ b/plugins/ssh.c
@@ -56,20 +56,25 @@ scan_free (void *handle)
 static void
 on_data (void *handle, struct unit *u, struct str *data)
 {
-	// TODO: don't let the input buffer grow too much
+	// See RFC 4253 -- we check for a valid SSH banner
 	struct scan_data *scan = handle;
-	str_append_str (&scan->input, data);
+	if (scan->input.len + data->len > 255)
+		goto end_scan;
 
+	str_append_str (&scan->input, data);
 	char *input = scan->input.str;
 	char *nl = strstr (input, "\r\n");
 	if (!nl)
 		return;
 
-	// TODO: parse the reply, make sure that it's actually SSH,
-	//   don't put just any garbage in the output info
+	if (strncmp (input, "SSH-", 4))
+		goto end_scan;
+
 	*nl = '\0';
 	g_data.api->unit_add_info (u, input);
 	g_data.api->unit_set_success (u, true);
+
+end_scan:
 	g_data.api->unit_abort (u);
 }