4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
27 #include <sys/socket.h>
36 #include <avahi-core/llist.h>
37 #include <avahi-core/log.h>
39 #include "simple-protocol.h"
42 #define BUFFER_SIZE (10*1024)
44 #define UNIX_SOCKET AVAHI_RUNTIME_DIR "/socket"
46 #define CLIENTS_MAX 50
48 typedef struct Client Client;
49 typedef struct Server Server;
53 CLIENT_RESOLVE_HOSTNAME,
54 CLIENT_RESOLVE_ADDRESS,
66 gchar inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
67 guint inbuf_length, outbuf_length;
69 AvahiHostNameResolver *host_name_resolver;
70 AvahiAddressResolver *address_resolver;
72 AVAHI_LLIST_FIELDS(Client, clients);
77 GMainContext *context;
80 AVAHI_LLIST_HEAD(Client, clients);
83 gboolean bind_successful;
86 static Server *server = NULL;
88 static void client_free(Client *c) {
91 g_assert(c->server->n_clients >= 1);
92 c->server->n_clients--;
94 if (c->host_name_resolver)
95 avahi_host_name_resolver_free(c->host_name_resolver);
97 if (c->address_resolver)
98 avahi_address_resolver_free(c->address_resolver);
100 g_source_remove_poll(&c->server->source, &c->poll_fd);
102 AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c);
106 static void client_new(Server *s, int fd) {
111 c = g_new(Client, 1);
114 c->state = CLIENT_IDLE;
116 c->inbuf_length = c->outbuf_length = 0;
118 c->host_name_resolver = NULL;
119 c->address_resolver = NULL;
121 memset(&c->poll_fd, 0, sizeof(GPollFD));
123 c->poll_fd.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
124 g_source_add_poll(&s->source, &c->poll_fd);
126 AVAHI_LLIST_PREPEND(Client, clients, s->clients, c);
130 static void client_output(Client *c, const guint8*data, guint size) {
139 k = sizeof(c->outbuf) - c->outbuf_length;
140 m = size > k ? k : size;
142 memcpy(c->outbuf + c->outbuf_length, data, m);
143 c->outbuf_length += m;
145 c->poll_fd.events |= G_IO_OUT;
148 static void client_output_printf(Client *c, gchar *format, ...) {
152 va_start(ap, format);
153 vsnprintf(txt, sizeof(txt), format, ap);
156 client_output(c, (guint8*) txt, strlen(txt));
159 static void host_name_resolver_callback(AvahiHostNameResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const gchar *hostname, const AvahiAddress *a, gpointer userdata) {
160 Client *c = userdata;
165 if (event == AVAHI_RESOLVER_TIMEOUT)
166 client_output_printf(c, "- Query timed out\n");
169 avahi_address_snprint(t, sizeof(t), a);
170 client_output_printf(c, "+ %s\n", t);
173 c->state = CLIENT_DEAD;
176 static void address_resolver_callback(AvahiAddressResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const AvahiAddress *a, const gchar *hostname, gpointer userdata) {
177 Client *c = userdata;
181 if (event == AVAHI_RESOLVER_TIMEOUT)
182 client_output_printf(c, "- Query timed out\n");
184 client_output_printf(c, "+ %s\n", hostname);
186 c->state = CLIENT_DEAD;
189 static void handle_line(Client *c, const gchar *s) {
190 gchar cmd[64], arg[64];
196 if (c->state != CLIENT_IDLE)
199 if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
200 client_output_printf(c, "- Failed to parse command, try \"HELP\".\n");
201 c->state = CLIENT_DEAD;
205 if (strcmp(cmd, "HELP") == 0) {
206 client_output_printf(c,
207 "+ Available commands are:\n"
208 "+ RESOLVE-HOSTNAME <hostname>\n"
209 "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
210 "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
211 "+ RESOLVE-ADDRESS <address>\n");
212 c->state = CLIENT_DEAD; }
213 else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) {
214 client_output_printf(c, "FUCK: Go fuck yourself!\n");
215 c->state = CLIENT_DEAD;
216 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
217 c->state = CLIENT_RESOLVE_HOSTNAME;
218 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_INET, host_name_resolver_callback, c);
219 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
220 c->state = CLIENT_RESOLVE_HOSTNAME;
221 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_INET6, host_name_resolver_callback, c);
222 } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
223 c->state = CLIENT_RESOLVE_HOSTNAME;
224 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_UNSPEC, host_name_resolver_callback, c);
225 } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
228 if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
229 client_output_printf(c, "- Failed to parse address \"%s\".\n", arg);
230 c->state = CLIENT_DEAD;
232 c->state = CLIENT_RESOLVE_ADDRESS;
233 c->address_resolver = avahi_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c);
236 client_output_printf(c, "- Invalid command \"%s\", try \"HELP\".\n", cmd);
237 c->state = CLIENT_DEAD;
241 static void handle_input(Client *c) {
248 if (!(e = memchr(c->inbuf, '\n', c->inbuf_length)))
251 k = e - (gchar*) c->inbuf;
254 handle_line(c, c->inbuf);
255 c->inbuf_length -= k + 1;
256 memmove(c->inbuf, e+1, c->inbuf_length);
260 static void client_work(Client *c) {
263 if ((c->poll_fd.revents & G_IO_IN) && c->inbuf_length < sizeof(c->inbuf)) {
266 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
268 avahi_log_warn("read(): %s", strerror(errno));
273 c->inbuf_length += r;
274 g_assert(c->inbuf_length <= sizeof(c->inbuf));
279 if ((c->poll_fd.revents & G_IO_OUT) && c->outbuf_length > 0) {
282 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
283 avahi_log_warn("write(): %s", strerror(errno));
288 g_assert((guint) r <= c->outbuf_length);
289 c->outbuf_length -= r;
291 if (c->outbuf_length)
292 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
294 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
303 (c->outbuf_length > 0 ? G_IO_OUT : 0) |
304 (c->inbuf_length < sizeof(c->inbuf) ? G_IO_IN : 0);
307 static gboolean prepare_func(GSource *source, gint *timeout) {
315 static gboolean check_func(GSource *source) {
316 Server *s = (Server*) source;
321 if (s->poll_fd.revents)
324 for (c = s->clients; c; c = c->clients_next)
325 if (c->poll_fd.revents)
331 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
332 Server *s = (Server*) source;
337 if (s->poll_fd.revents & G_IO_IN) {
340 if ((fd = accept(s->fd, NULL, NULL)) < 0)
341 avahi_log_warn("accept(): %s", strerror(errno));
344 } else if (s->poll_fd.revents)
345 g_error("Invalid revents");
347 for (c = s->clients; c; c = n) {
349 if (c->poll_fd.revents)
356 int simple_protocol_setup(GMainContext *c) {
357 struct sockaddr_un sa;
360 static GSourceFuncs source_funcs = {
371 server = (Server*) g_source_new(&source_funcs, sizeof(Server));
372 server->bind_successful = FALSE;
374 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
375 g_main_context_ref(server->context = (c ? c : g_main_context_default()));
376 server->clients = NULL;
380 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
381 avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
385 memset(&sa, 0, sizeof(sa));
386 sa.sun_family = AF_LOCAL;
387 strncpy(sa.sun_path, UNIX_SOCKET, sizeof(sa.sun_path)-1);
389 /* We simply remove existing UNIX sockets under this name. The
390 Avahi daemons makes sure that it runs only once on a host,
391 therefore sockets that already exist are stale and may be
392 removed without any ill effects */
396 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
397 avahi_log_warn("bind(): %s", strerror(errno));
401 server->bind_successful = TRUE;
403 if (listen(server->fd, 2) < 0) {
404 avahi_log_warn("listen(): %s", strerror(errno));
410 memset(&server->poll_fd, 0, sizeof(GPollFD));
411 server->poll_fd.fd = server->fd;
412 server->poll_fd.events = G_IO_IN|G_IO_ERR;
413 g_source_add_poll(&server->source, &server->poll_fd);
415 g_source_attach(&server->source, server->context);
422 simple_protocol_shutdown();
427 void simple_protocol_shutdown(void) {
431 while (server->clients)
432 client_free(server->clients);
434 if (server->bind_successful)
440 g_main_context_unref(server->context);
442 g_source_destroy(&server->source);
443 g_source_unref(&server->source);