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_PATH "/tmp/avahi"
45 #define UNIX_SOCKET UNIX_SOCKET_PATH"/socket"
47 #define CLIENTS_MAX 50
49 typedef struct Client Client;
50 typedef struct Server Server;
54 CLIENT_RESOLVE_HOSTNAME,
55 CLIENT_RESOLVE_ADDRESS,
67 gchar inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
68 guint inbuf_length, outbuf_length;
70 AvahiHostNameResolver *host_name_resolver;
71 AvahiAddressResolver *address_resolver;
73 AVAHI_LLIST_FIELDS(Client, clients);
78 GMainContext *context;
81 AVAHI_LLIST_HEAD(Client, clients);
84 gboolean bind_successful;
87 static Server *server = NULL;
89 static void client_free(Client *c) {
92 g_assert(c->server->n_clients >= 1);
93 c->server->n_clients--;
95 if (c->host_name_resolver)
96 avahi_host_name_resolver_free(c->host_name_resolver);
98 if (c->address_resolver)
99 avahi_address_resolver_free(c->address_resolver);
101 g_source_remove_poll(&c->server->source, &c->poll_fd);
103 AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c);
107 static void client_new(Server *s, int fd) {
112 c = g_new(Client, 1);
115 c->state = CLIENT_IDLE;
117 c->inbuf_length = c->outbuf_length = 0;
119 c->host_name_resolver = NULL;
120 c->address_resolver = NULL;
122 memset(&c->poll_fd, 0, sizeof(GPollFD));
124 c->poll_fd.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
125 g_source_add_poll(&s->source, &c->poll_fd);
127 AVAHI_LLIST_PREPEND(Client, clients, s->clients, c);
131 static void client_output(Client *c, const guint8*data, guint size) {
140 k = sizeof(c->outbuf) - c->outbuf_length;
141 m = size > k ? k : size;
143 memcpy(c->outbuf + c->outbuf_length, data, m);
144 c->outbuf_length += m;
146 c->poll_fd.events |= G_IO_OUT;
149 static void client_output_printf(Client *c, gchar *format, ...) {
153 va_start(ap, format);
154 vsnprintf(txt, sizeof(txt), format, ap);
157 client_output(c, (guint8*) txt, strlen(txt));
160 static void host_name_resolver_callback(AvahiHostNameResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const gchar *hostname, const AvahiAddress *a, gpointer userdata) {
161 Client *c = userdata;
166 if (event == AVAHI_RESOLVER_TIMEOUT)
167 client_output_printf(c, "- Query timed out\n");
170 avahi_address_snprint(t, sizeof(t), a);
171 client_output_printf(c, "+ %s\n", t);
174 c->state = CLIENT_DEAD;
177 static void address_resolver_callback(AvahiAddressResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const AvahiAddress *a, const gchar *hostname, gpointer userdata) {
178 Client *c = userdata;
182 if (event == AVAHI_RESOLVER_TIMEOUT)
183 client_output_printf(c, "- Query timed out\n");
185 client_output_printf(c, "+ %s\n", hostname);
187 c->state = CLIENT_DEAD;
190 static void handle_line(Client *c, const gchar *s) {
191 gchar cmd[64], arg[64];
197 if (c->state != CLIENT_IDLE)
200 if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
201 client_output_printf(c, "- Failed to parse command, try \"HELP\".\n");
202 c->state = CLIENT_DEAD;
206 if (strcmp(cmd, "HELP") == 0) {
207 client_output_printf(c,
208 "+ Available commands are:\n"
209 "+ RESOLVE-HOSTNAME <hostname>\n"
210 "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
211 "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
212 "+ RESOLVE-ADDRESS <address>\n");
213 c->state = CLIENT_DEAD; }
214 else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) {
215 client_output_printf(c, "FUCK: Go fuck yourself!\n");
216 c->state = CLIENT_DEAD;
217 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
218 c->state = CLIENT_RESOLVE_HOSTNAME;
219 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_INET, host_name_resolver_callback, c);
220 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
221 c->state = CLIENT_RESOLVE_HOSTNAME;
222 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_INET6, host_name_resolver_callback, c);
223 } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
224 c->state = CLIENT_RESOLVE_HOSTNAME;
225 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_UNSPEC, host_name_resolver_callback, c);
226 } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
229 if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
230 client_output_printf(c, "- Failed to parse address \"%s\".\n", arg);
231 c->state = CLIENT_DEAD;
233 c->state = CLIENT_RESOLVE_ADDRESS;
234 c->address_resolver = avahi_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c);
237 client_output_printf(c, "- Invalid command \"%s\", try \"HELP\".\n", cmd);
238 c->state = CLIENT_DEAD;
242 static void handle_input(Client *c) {
249 if (!(e = memchr(c->inbuf, '\n', c->inbuf_length)))
252 k = e - (gchar*) c->inbuf;
255 handle_line(c, c->inbuf);
256 c->inbuf_length -= k + 1;
257 memmove(c->inbuf, e+1, c->inbuf_length);
261 static void client_work(Client *c) {
264 if ((c->poll_fd.revents & G_IO_IN) && c->inbuf_length < sizeof(c->inbuf)) {
267 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
269 avahi_log_warn("read(): %s", strerror(errno));
274 c->inbuf_length += r;
275 g_assert(c->inbuf_length <= sizeof(c->inbuf));
280 if ((c->poll_fd.revents & G_IO_OUT) && c->outbuf_length > 0) {
283 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
284 avahi_log_warn("write(): %s", strerror(errno));
289 g_assert((guint) r <= c->outbuf_length);
290 c->outbuf_length -= r;
292 if (c->outbuf_length)
293 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
295 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
304 (c->outbuf_length > 0 ? G_IO_OUT : 0) |
305 (c->inbuf_length < sizeof(c->inbuf) ? G_IO_IN : 0);
308 static gboolean prepare_func(GSource *source, gint *timeout) {
316 static gboolean check_func(GSource *source) {
317 Server *s = (Server*) source;
322 if (s->poll_fd.revents)
325 for (c = s->clients; c; c = c->clients_next)
326 if (c->poll_fd.revents)
332 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
333 Server *s = (Server*) source;
338 if (s->poll_fd.revents & G_IO_IN) {
341 if ((fd = accept(s->fd, NULL, NULL)) < 0)
342 avahi_log_warn("accept(): %s", strerror(errno));
345 } else if (s->poll_fd.revents)
346 g_error("Invalid revents");
348 for (c = s->clients; c; c = n) {
350 if (c->poll_fd.revents)
357 int simple_protocol_setup(GMainContext *c) {
358 struct sockaddr_un sa;
361 static GSourceFuncs source_funcs = {
372 server = (Server*) g_source_new(&source_funcs, sizeof(Server));
373 server->bind_successful = FALSE;
375 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
376 g_main_context_ref(server->context = (c ? c : g_main_context_default()));
377 server->clients = NULL;
381 if (mkdir(UNIX_SOCKET_PATH, 0755) < 0 && errno != EEXIST) {
382 avahi_log_warn("mkdir(): %s", strerror(errno));
386 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
387 avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
391 memset(&sa, 0, sizeof(sa));
392 sa.sun_family = AF_LOCAL;
393 strncpy(sa.sun_path, UNIX_SOCKET, sizeof(sa.sun_path)-1);
395 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
396 avahi_log_warn("bind(): %s", strerror(errno));
400 server->bind_successful = TRUE;
402 if (listen(server->fd, 2) < 0) {
403 avahi_log_warn("listen(): %s", strerror(errno));
409 memset(&server->poll_fd, 0, sizeof(GPollFD));
410 server->poll_fd.fd = server->fd;
411 server->poll_fd.events = G_IO_IN|G_IO_ERR;
412 g_source_add_poll(&server->source, &server->poll_fd);
414 g_source_attach(&server->source, server->context);
421 simple_protocol_shutdown();
426 void simple_protocol_shutdown(void) {
430 while (server->clients)
431 client_free(server->clients);
433 if (server->bind_successful)
439 g_main_context_unref(server->context);
441 g_source_destroy(&server->source);
442 g_source_unref(&server->source);