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-common/llist.h>
37 #include <avahi-core/log.h>
39 #include "simple-protocol.h"
42 #define BUFFER_SIZE (20*1024)
44 #define CLIENTS_MAX 50
46 typedef struct Client Client;
47 typedef struct Server Server;
51 CLIENT_RESOLVE_HOSTNAME,
52 CLIENT_RESOLVE_ADDRESS,
53 CLIENT_BROWSE_DNS_SERVERS,
65 gchar inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
66 guint inbuf_length, outbuf_length;
68 AvahiSHostNameResolver *host_name_resolver;
69 AvahiSAddressResolver *address_resolver;
70 AvahiSDNSServerBrowser *dns_server_browser;
72 AvahiProtocol afquery;
74 AVAHI_LLIST_FIELDS(Client, clients);
79 GMainContext *context;
82 AVAHI_LLIST_HEAD(Client, clients);
85 gboolean bind_successful;
88 static Server *server = NULL;
90 static void client_free(Client *c) {
93 g_assert(c->server->n_clients >= 1);
94 c->server->n_clients--;
96 if (c->host_name_resolver)
97 avahi_s_host_name_resolver_free(c->host_name_resolver);
99 if (c->address_resolver)
100 avahi_s_address_resolver_free(c->address_resolver);
102 if (c->dns_server_browser)
103 avahi_s_dns_server_browser_free(c->dns_server_browser);
105 g_source_remove_poll(&c->server->source, &c->poll_fd);
107 AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c);
111 static void client_new(Server *s, int fd) {
116 c = g_new(Client, 1);
119 c->state = CLIENT_IDLE;
121 c->inbuf_length = c->outbuf_length = 0;
123 c->host_name_resolver = NULL;
124 c->address_resolver = NULL;
125 c->dns_server_browser = NULL;
127 memset(&c->poll_fd, 0, sizeof(GPollFD));
129 c->poll_fd.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
130 g_source_add_poll(&s->source, &c->poll_fd);
132 AVAHI_LLIST_PREPEND(Client, clients, s->clients, c);
136 static void client_output(Client *c, const guint8*data, guint size) {
145 k = sizeof(c->outbuf) - c->outbuf_length;
146 m = size > k ? k : size;
148 memcpy(c->outbuf + c->outbuf_length, data, m);
149 c->outbuf_length += m;
151 c->poll_fd.events |= G_IO_OUT;
154 static void client_output_printf(Client *c, const gchar *format, ...) {
158 va_start(ap, format);
159 t = g_strdup_vprintf(format, ap);
162 client_output(c, (guint8*) t, strlen(t));
167 static void host_name_resolver_callback(
168 AvahiSHostNameResolver *r,
170 AvahiProtocol protocol,
171 AvahiResolverEvent event,
172 const char *hostname,
173 const AvahiAddress *a,
176 Client *c = userdata;
180 if (event == AVAHI_RESOLVER_TIMEOUT)
181 client_output_printf(c, "%+i Query timed out\n", AVAHI_ERR_TIMEOUT);
184 avahi_address_snprint(t, sizeof(t), a);
185 client_output_printf(c, "+ %i %u %s %s\n", iface, protocol, hostname, t);
188 c->state = CLIENT_DEAD;
191 static void address_resolver_callback(
192 AvahiSAddressResolver *r,
194 AvahiProtocol protocol,
195 AvahiResolverEvent event,
196 const AvahiAddress *a,
197 const char *hostname,
200 Client *c = userdata;
204 if (event == AVAHI_RESOLVER_TIMEOUT)
205 client_output_printf(c, "%+i Query timed out\n", AVAHI_ERR_TIMEOUT);
207 client_output_printf(c, "+ %i %u %s\n", iface, protocol, hostname);
209 c->state = CLIENT_DEAD;
212 static void dns_server_browser_callback(
213 AvahiSDNSServerBrowser *b,
214 AvahiIfIndex interface,
215 AvahiProtocol protocol,
216 AvahiBrowserEvent event,
217 const char *host_name,
218 const AvahiAddress *a,
222 Client *c = userdata;
230 avahi_address_snprint(t, sizeof(t), a);
231 client_output_printf(c, "%c %i %u %s %u\n", event == AVAHI_BROWSER_NEW ? '>' : '<', interface, protocol, t, port);
234 static void handle_line(Client *c, const gchar *s) {
235 gchar cmd[64], arg[64];
241 if (c->state != CLIENT_IDLE)
244 if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
245 client_output_printf(c, "%+i Failed to parse command, try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION);
246 c->state = CLIENT_DEAD;
250 if (strcmp(cmd, "HELP") == 0) {
251 client_output_printf(c,
252 "+ Available commands are:\n"
253 "+ RESOLVE-HOSTNAME <hostname>\n"
254 "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
255 "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
256 "+ RESOLVE-ADDRESS <address>\n"
257 "+ BROWSE-DNS-SERVERS\n"
258 "+ BROWSE-DNS-SERVERS-IPV4\n"
259 "+ BROWSE-DNS-SERVERS-IPV6\n");
260 c->state = CLIENT_DEAD; }
261 else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) {
262 client_output_printf(c, "+ FUCK: Go fuck yourself!\n");
263 c->state = CLIENT_DEAD;
264 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
265 c->state = CLIENT_RESOLVE_HOSTNAME;
266 if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET, host_name_resolver_callback, c)))
268 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
269 c->state = CLIENT_RESOLVE_HOSTNAME;
270 if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET6, host_name_resolver_callback, c)))
272 } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
273 c->state = CLIENT_RESOLVE_HOSTNAME;
274 if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_UNSPEC, host_name_resolver_callback, c)))
276 } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
279 if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
280 client_output_printf(c, "%+i Failed to parse address \"%s\".\n", AVAHI_ERR_INVALID_ADDRESS, arg);
281 c->state = CLIENT_DEAD;
283 c->state = CLIENT_RESOLVE_ADDRESS;
284 if (!(c->address_resolver = avahi_s_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c)))
287 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV4") == 0 && n_args == 1) {
288 c->state = CLIENT_BROWSE_DNS_SERVERS;
289 if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET, dns_server_browser_callback, c)))
291 client_output_printf(c, "+ Browsing ...\n");
292 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV6") == 0 && n_args == 1) {
293 c->state = CLIENT_BROWSE_DNS_SERVERS;
294 if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET6, dns_server_browser_callback, c)))
296 client_output_printf(c, "+ Browsing ...\n");
297 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS") == 0 && n_args == 1) {
298 c->state = CLIENT_BROWSE_DNS_SERVERS;
299 if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_UNSPEC, dns_server_browser_callback, c)))
301 client_output_printf(c, "+ Browsing ...\n");
303 client_output_printf(c, "%+i Invalid command \"%s\", try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION, cmd);
304 c->state = CLIENT_DEAD;
310 client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server)));
311 c->state = CLIENT_DEAD;
314 static void handle_input(Client *c) {
321 if (!(e = memchr(c->inbuf, '\n', c->inbuf_length)))
324 k = e - (gchar*) c->inbuf;
327 handle_line(c, c->inbuf);
328 c->inbuf_length -= k + 1;
329 memmove(c->inbuf, e+1, c->inbuf_length);
333 static void client_work(Client *c) {
336 if ((c->poll_fd.revents & G_IO_IN) && c->inbuf_length < sizeof(c->inbuf)) {
339 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
341 avahi_log_warn("read(): %s", strerror(errno));
346 c->inbuf_length += r;
347 g_assert(c->inbuf_length <= sizeof(c->inbuf));
352 if ((c->poll_fd.revents & G_IO_OUT) && c->outbuf_length > 0) {
355 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
356 avahi_log_warn("write(): %s", strerror(errno));
361 g_assert((guint) r <= c->outbuf_length);
362 c->outbuf_length -= r;
364 if (c->outbuf_length)
365 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
367 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
376 (c->outbuf_length > 0 ? G_IO_OUT : 0) |
377 (c->inbuf_length < sizeof(c->inbuf) ? G_IO_IN : 0);
380 static gboolean prepare_func(GSource *source, gint *timeout) {
388 static gboolean check_func(GSource *source) {
389 Server *s = (Server*) source;
394 if (s->poll_fd.revents)
397 for (c = s->clients; c; c = c->clients_next)
398 if (c->poll_fd.revents)
404 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
405 Server *s = (Server*) source;
410 if (s->poll_fd.revents & G_IO_IN) {
413 if ((fd = accept(s->fd, NULL, NULL)) < 0)
414 avahi_log_warn("accept(): %s", strerror(errno));
417 } else if (s->poll_fd.revents)
418 g_error("Invalid revents");
420 for (c = s->clients; c; c = n) {
422 if (c->poll_fd.revents)
429 int simple_protocol_setup(GMainContext *c) {
430 struct sockaddr_un sa;
433 static GSourceFuncs source_funcs = {
444 server = (Server*) g_source_new(&source_funcs, sizeof(Server));
445 server->bind_successful = FALSE;
447 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
448 g_main_context_ref(server->context = (c ? c : g_main_context_default()));
449 server->clients = NULL;
453 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
454 avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
458 memset(&sa, 0, sizeof(sa));
459 sa.sun_family = AF_LOCAL;
460 strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1);
462 /* We simply remove existing UNIX sockets under this name. The
463 Avahi daemons makes sure that it runs only once on a host,
464 therefore sockets that already exist are stale and may be
465 removed without any ill effects */
467 unlink(AVAHI_SOCKET);
469 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
470 avahi_log_warn("bind(): %s", strerror(errno));
474 server->bind_successful = TRUE;
476 if (listen(server->fd, 2) < 0) {
477 avahi_log_warn("listen(): %s", strerror(errno));
483 memset(&server->poll_fd, 0, sizeof(GPollFD));
484 server->poll_fd.fd = server->fd;
485 server->poll_fd.events = G_IO_IN|G_IO_ERR;
486 g_source_add_poll(&server->source, &server->poll_fd);
488 g_source_attach(&server->source, server->context);
495 simple_protocol_shutdown();
500 void simple_protocol_shutdown(void) {
504 while (server->clients)
505 client_free(server->clients);
507 if (server->bind_successful)
508 unlink(AVAHI_SOCKET);
513 g_main_context_unref(server->context);
515 g_source_destroy(&server->source);
516 g_source_unref(&server->source);
522 void simple_protocol_restart_queries(void) {
525 /* Restart queries in case of local domain name changes */
529 for (c = server->clients; c; c = c->clients_next)
530 if (c->state == CLIENT_BROWSE_DNS_SERVERS && c->dns_server_browser) {
531 avahi_s_dns_server_browser_free(c->dns_server_browser);
532 c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery, dns_server_browser_callback, c);