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
28 #include <sys/socket.h>
35 #include <avahi-common/llist.h>
36 #include <avahi-common/malloc.h>
37 #include <avahi-common/error.h>
38 #include <avahi-core/log.h>
40 #include "simple-protocol.h"
43 #define BUFFER_SIZE (20*1024)
45 #define CLIENTS_MAX 50
47 typedef struct Client Client;
48 typedef struct Server Server;
52 CLIENT_RESOLVE_HOSTNAME,
53 CLIENT_RESOLVE_ADDRESS,
54 CLIENT_BROWSE_DNS_SERVERS,
66 char inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
67 size_t inbuf_length, outbuf_length;
69 AvahiSHostNameResolver *host_name_resolver;
70 AvahiSAddressResolver *address_resolver;
71 AvahiSDNSServerBrowser *dns_server_browser;
73 AvahiProtocol afquery;
75 AVAHI_LLIST_FIELDS(Client, clients);
79 const AvahiPoll *poll_api;
82 AVAHI_LLIST_HEAD(Client, clients);
88 static Server *server = NULL;
90 static void client_work(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata);
92 static void client_free(Client *c) {
95 assert(c->server->n_clients >= 1);
96 c->server->n_clients--;
98 if (c->host_name_resolver)
99 avahi_s_host_name_resolver_free(c->host_name_resolver);
101 if (c->address_resolver)
102 avahi_s_address_resolver_free(c->address_resolver);
104 if (c->dns_server_browser)
105 avahi_s_dns_server_browser_free(c->dns_server_browser);
107 c->server->poll_api->watch_free(c->watch);
110 AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c);
114 static void client_new(Server *s, int fd) {
119 c = avahi_new(Client, 1);
122 c->state = CLIENT_IDLE;
124 c->inbuf_length = c->outbuf_length = 0;
126 c->host_name_resolver = NULL;
127 c->address_resolver = NULL;
128 c->dns_server_browser = NULL;
130 c->watch = s->poll_api->watch_new(s->poll_api, fd, AVAHI_WATCH_IN, client_work, c);
132 AVAHI_LLIST_PREPEND(Client, clients, s->clients, c);
136 static void client_output(Client *c, const uint8_t*data, size_t 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 server->poll_api->watch_update(c->watch, AVAHI_WATCH_OUT);
154 static void client_output_printf(Client *c, const char *format, ...) {
158 va_start(ap, format);
159 t = avahi_strdup_vprintf(format, ap);
162 client_output(c, (uint8_t*) 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 char *s) {
235 char 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 - (char*) 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(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata) {
334 Client *c = userdata;
338 if ((events & AVAHI_WATCH_IN) && c->inbuf_length < sizeof(c->inbuf)) {
341 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
343 avahi_log_warn("read(): %s", strerror(errno));
348 c->inbuf_length += r;
349 assert(c->inbuf_length <= sizeof(c->inbuf));
354 if ((events & AVAHI_WATCH_OUT) && c->outbuf_length > 0) {
357 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
358 avahi_log_warn("write(): %s", strerror(errno));
363 assert((size_t) r <= c->outbuf_length);
364 c->outbuf_length -= r;
366 if (c->outbuf_length)
367 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
369 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
375 c->server->poll_api->watch_update(
377 (c->outbuf_length > 0 ? AVAHI_WATCH_OUT : 0) |
378 (c->inbuf_length < sizeof(c->inbuf) ? AVAHI_WATCH_IN : 0));
381 static void server_work(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata) {
382 Server *s = userdata;
386 if (events & AVAHI_WATCH_IN) {
389 if ((cfd = accept(fd, NULL, NULL)) < 0)
390 avahi_log_error("accept(): %s", strerror(errno));
396 int simple_protocol_setup(const AvahiPoll *poll_api) {
397 struct sockaddr_un sa;
402 server = avahi_new(Server, 1);
403 server->poll_api = poll_api;
404 server->bind_successful = 0;
406 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
407 server->watch = NULL;
411 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
412 avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
416 memset(&sa, 0, sizeof(sa));
417 sa.sun_family = AF_LOCAL;
418 strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1);
420 /* We simply remove existing UNIX sockets under this name. The
421 Avahi daemons makes sure that it runs only once on a host,
422 therefore sockets that already exist are stale and may be
423 removed without any ill effects */
425 unlink(AVAHI_SOCKET);
427 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
428 avahi_log_warn("bind(): %s", strerror(errno));
432 server->bind_successful = 1;
434 if (listen(server->fd, 2) < 0) {
435 avahi_log_warn("listen(): %s", strerror(errno));
441 server->watch = poll_api->watch_new(poll_api, server->fd, AVAHI_WATCH_IN, server_work, server);
448 simple_protocol_shutdown();
453 void simple_protocol_shutdown(void) {
457 if (server->bind_successful)
458 unlink(AVAHI_SOCKET);
460 while (server->clients)
461 client_free(server->clients);
464 server->poll_api->watch_free(server->watch);
475 void simple_protocol_restart_queries(void) {
478 /* Restart queries in case of local domain name changes */
482 for (c = server->clients; c; c = c->clients_next)
483 if (c->state == CLIENT_BROWSE_DNS_SERVERS && c->dns_server_browser) {
484 avahi_s_dns_server_browser_free(c->dns_server_browser);
485 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);