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 AvahiHostNameResolver *host_name_resolver;
69 AvahiAddressResolver *address_resolver;
70 AvahiDNSServerBrowser *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_host_name_resolver_free(c->host_name_resolver);
99 if (c->address_resolver)
100 avahi_address_resolver_free(c->address_resolver);
102 if (c->dns_server_browser)
103 avahi_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 AvahiHostNameResolver *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 AvahiAddressResolver *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(AvahiDNSServerBrowser *b, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, const char *host_name, const AvahiAddress *a, uint16_t port, void* userdata) {
213 Client *c = userdata;
221 avahi_address_snprint(t, sizeof(t), a);
222 client_output_printf(c, "%c %i %u %s %u\n", event == AVAHI_BROWSER_NEW ? '>' : '<', interface, protocol, t, port);
225 static void handle_line(Client *c, const gchar *s) {
226 gchar cmd[64], arg[64];
232 if (c->state != CLIENT_IDLE)
235 if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
236 client_output_printf(c, "%+i Failed to parse command, try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION);
237 c->state = CLIENT_DEAD;
241 if (strcmp(cmd, "HELP") == 0) {
242 client_output_printf(c,
243 "+ Available commands are:\n"
244 "+ RESOLVE-HOSTNAME <hostname>\n"
245 "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
246 "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
247 "+ RESOLVE-ADDRESS <address>\n"
248 "+ BROWSE-DNS-SERVERS\n"
249 "+ BROWSE-DNS-SERVERS-IPV4\n"
250 "+ BROWSE-DNS-SERVERS-IPV6\n");
251 c->state = CLIENT_DEAD; }
252 else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) {
253 client_output_printf(c, "+ FUCK: Go fuck yourself!\n");
254 c->state = CLIENT_DEAD;
255 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
256 c->state = CLIENT_RESOLVE_HOSTNAME;
257 if (!(c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET, host_name_resolver_callback, c)))
259 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
260 c->state = CLIENT_RESOLVE_HOSTNAME;
261 if (!(c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET6, host_name_resolver_callback, c)))
263 } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
264 c->state = CLIENT_RESOLVE_HOSTNAME;
265 if (!(c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_UNSPEC, host_name_resolver_callback, c)))
267 } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
270 if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
271 client_output_printf(c, "%+i Failed to parse address \"%s\".\n", AVAHI_ERR_INVALID_ADDRESS, arg);
272 c->state = CLIENT_DEAD;
274 c->state = CLIENT_RESOLVE_ADDRESS;
275 if (!(c->address_resolver = avahi_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c)))
278 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV4") == 0 && n_args == 1) {
279 c->state = CLIENT_BROWSE_DNS_SERVERS;
280 if (!(c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET, dns_server_browser_callback, c)))
282 client_output_printf(c, "+ Browsing ...\n");
283 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV6") == 0 && n_args == 1) {
284 c->state = CLIENT_BROWSE_DNS_SERVERS;
285 if (!(c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET6, dns_server_browser_callback, c)))
287 client_output_printf(c, "+ Browsing ...\n");
288 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS") == 0 && n_args == 1) {
289 c->state = CLIENT_BROWSE_DNS_SERVERS;
290 if (!(c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_UNSPEC, dns_server_browser_callback, c)))
292 client_output_printf(c, "+ Browsing ...\n");
294 client_output_printf(c, "%+i Invalid command \"%s\", try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION, cmd);
295 c->state = CLIENT_DEAD;
301 client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server)));
302 c->state = CLIENT_DEAD;
305 static void handle_input(Client *c) {
312 if (!(e = memchr(c->inbuf, '\n', c->inbuf_length)))
315 k = e - (gchar*) c->inbuf;
318 handle_line(c, c->inbuf);
319 c->inbuf_length -= k + 1;
320 memmove(c->inbuf, e+1, c->inbuf_length);
324 static void client_work(Client *c) {
327 if ((c->poll_fd.revents & G_IO_IN) && c->inbuf_length < sizeof(c->inbuf)) {
330 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
332 avahi_log_warn("read(): %s", strerror(errno));
337 c->inbuf_length += r;
338 g_assert(c->inbuf_length <= sizeof(c->inbuf));
343 if ((c->poll_fd.revents & G_IO_OUT) && c->outbuf_length > 0) {
346 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
347 avahi_log_warn("write(): %s", strerror(errno));
352 g_assert((guint) r <= c->outbuf_length);
353 c->outbuf_length -= r;
355 if (c->outbuf_length)
356 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
358 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
367 (c->outbuf_length > 0 ? G_IO_OUT : 0) |
368 (c->inbuf_length < sizeof(c->inbuf) ? G_IO_IN : 0);
371 static gboolean prepare_func(GSource *source, gint *timeout) {
379 static gboolean check_func(GSource *source) {
380 Server *s = (Server*) source;
385 if (s->poll_fd.revents)
388 for (c = s->clients; c; c = c->clients_next)
389 if (c->poll_fd.revents)
395 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
396 Server *s = (Server*) source;
401 if (s->poll_fd.revents & G_IO_IN) {
404 if ((fd = accept(s->fd, NULL, NULL)) < 0)
405 avahi_log_warn("accept(): %s", strerror(errno));
408 } else if (s->poll_fd.revents)
409 g_error("Invalid revents");
411 for (c = s->clients; c; c = n) {
413 if (c->poll_fd.revents)
420 int simple_protocol_setup(GMainContext *c) {
421 struct sockaddr_un sa;
424 static GSourceFuncs source_funcs = {
435 server = (Server*) g_source_new(&source_funcs, sizeof(Server));
436 server->bind_successful = FALSE;
438 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
439 g_main_context_ref(server->context = (c ? c : g_main_context_default()));
440 server->clients = NULL;
444 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
445 avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
449 memset(&sa, 0, sizeof(sa));
450 sa.sun_family = AF_LOCAL;
451 strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1);
453 /* We simply remove existing UNIX sockets under this name. The
454 Avahi daemons makes sure that it runs only once on a host,
455 therefore sockets that already exist are stale and may be
456 removed without any ill effects */
458 unlink(AVAHI_SOCKET);
460 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
461 avahi_log_warn("bind(): %s", strerror(errno));
465 server->bind_successful = TRUE;
467 if (listen(server->fd, 2) < 0) {
468 avahi_log_warn("listen(): %s", strerror(errno));
474 memset(&server->poll_fd, 0, sizeof(GPollFD));
475 server->poll_fd.fd = server->fd;
476 server->poll_fd.events = G_IO_IN|G_IO_ERR;
477 g_source_add_poll(&server->source, &server->poll_fd);
479 g_source_attach(&server->source, server->context);
486 simple_protocol_shutdown();
491 void simple_protocol_shutdown(void) {
495 while (server->clients)
496 client_free(server->clients);
498 if (server->bind_successful)
499 unlink(AVAHI_SOCKET);
504 g_main_context_unref(server->context);
506 g_source_destroy(&server->source);
507 g_source_unref(&server->source);
513 void simple_protocol_restart_queries(void) {
516 /* Restart queries in case of local domain name changes */
520 for (c = server->clients; c; c = c->clients_next)
521 if (c->state == CLIENT_BROWSE_DNS_SERVERS && c->dns_server_browser) {
522 avahi_dns_server_browser_free(c->dns_server_browser);
523 c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery, dns_server_browser_callback, c);