diff options
Diffstat (limited to 'trunk/avahi-daemon/simple-protocol.c')
| -rw-r--r-- | trunk/avahi-daemon/simple-protocol.c | 547 |
1 files changed, 0 insertions, 547 deletions
diff --git a/trunk/avahi-daemon/simple-protocol.c b/trunk/avahi-daemon/simple-protocol.c deleted file mode 100644 index 04b07c7..0000000 --- a/trunk/avahi-daemon/simple-protocol.c +++ /dev/null @@ -1,547 +0,0 @@ -/* $Id$ */ - -/*** - This file is part of avahi. - - avahi is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - avahi is distributed in the hope that it will be useful, but WITHOUT - ANY WARRANTY; without even the implied warranty of MERCHANTABILITY - or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General - Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with avahi; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 - USA. -***/ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -#include <assert.h> -#include <string.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <stdio.h> -#include <unistd.h> -#include <sys/un.h> -#include <errno.h> -#include <fcntl.h> -#include <sys/stat.h> - -#include <avahi-common/llist.h> -#include <avahi-common/malloc.h> -#include <avahi-common/error.h> - -#include <avahi-core/log.h> -#include <avahi-core/lookup.h> -#include <avahi-core/dns-srv-rr.h> - -#include "simple-protocol.h" -#include "main.h" - -#ifdef ENABLE_CHROOT -#include "chroot.h" -#endif - -#ifndef AF_LOCAL -#define AF_LOCAL AF_UNIX -#endif -#ifndef PF_LOCAL -#define PF_LOCAL PF_UNIX -#endif - -#define BUFFER_SIZE (20*1024) - -#define CLIENTS_MAX 50 - -typedef struct Client Client; -typedef struct Server Server; - -typedef enum { - CLIENT_IDLE, - CLIENT_RESOLVE_HOSTNAME, - CLIENT_RESOLVE_ADDRESS, - CLIENT_BROWSE_DNS_SERVERS, - CLIENT_DEAD -} ClientState; - -struct Client { - Server *server; - - ClientState state; - - int fd; - AvahiWatch *watch; - - char inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE]; - size_t inbuf_length, outbuf_length; - - AvahiSHostNameResolver *host_name_resolver; - AvahiSAddressResolver *address_resolver; - AvahiSDNSServerBrowser *dns_server_browser; - - AvahiProtocol afquery; - - AVAHI_LLIST_FIELDS(Client, clients); -}; - -struct Server { - const AvahiPoll *poll_api; - int fd; - AvahiWatch *watch; - AVAHI_LLIST_HEAD(Client, clients); - - unsigned n_clients; - int bind_successful; -}; - -static Server *server = NULL; - -static void client_work(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata); - -static void client_free(Client *c) { - assert(c); - - assert(c->server->n_clients >= 1); - c->server->n_clients--; - - if (c->host_name_resolver) - avahi_s_host_name_resolver_free(c->host_name_resolver); - - if (c->address_resolver) - avahi_s_address_resolver_free(c->address_resolver); - - if (c->dns_server_browser) - avahi_s_dns_server_browser_free(c->dns_server_browser); - - c->server->poll_api->watch_free(c->watch); - close(c->fd); - - AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c); - avahi_free(c); -} - -static void client_new(Server *s, int fd) { - Client *c; - - assert(fd >= 0); - - c = avahi_new(Client, 1); - c->server = s; - c->fd = fd; - c->state = CLIENT_IDLE; - - c->inbuf_length = c->outbuf_length = 0; - - c->host_name_resolver = NULL; - c->address_resolver = NULL; - c->dns_server_browser = NULL; - - c->watch = s->poll_api->watch_new(s->poll_api, fd, AVAHI_WATCH_IN, client_work, c); - - AVAHI_LLIST_PREPEND(Client, clients, s->clients, c); - s->n_clients++; -} - -static void client_output(Client *c, const uint8_t*data, size_t size) { - size_t k, m; - - assert(c); - assert(data); - - if (!size) - return; - - k = sizeof(c->outbuf) - c->outbuf_length; - m = size > k ? k : size; - - memcpy(c->outbuf + c->outbuf_length, data, m); - c->outbuf_length += m; - - server->poll_api->watch_update(c->watch, AVAHI_WATCH_OUT); -} - -static void client_output_printf(Client *c, const char *format, ...) { - char *t; - va_list ap; - - va_start(ap, format); - t = avahi_strdup_vprintf(format, ap); - va_end(ap); - - client_output(c, (uint8_t*) t, strlen(t)); - avahi_free(t); -} - -static void host_name_resolver_callback( - AVAHI_GCC_UNUSED AvahiSHostNameResolver *r, - AvahiIfIndex iface, - AvahiProtocol protocol, - AvahiResolverEvent event, - const char *hostname, - const AvahiAddress *a, - AVAHI_GCC_UNUSED AvahiLookupResultFlags flags, - void* userdata) { - - Client *c = userdata; - - assert(c); - - if (event == AVAHI_RESOLVER_FAILURE) - client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server))); - else if (event == AVAHI_RESOLVER_FOUND) { - char t[AVAHI_ADDRESS_STR_MAX]; - avahi_address_snprint(t, sizeof(t), a); - client_output_printf(c, "+ %i %u %s %s\n", iface, protocol, hostname, t); - } - - c->state = CLIENT_DEAD; -} - -static void address_resolver_callback( - AVAHI_GCC_UNUSED AvahiSAddressResolver *r, - AvahiIfIndex iface, - AvahiProtocol protocol, - AvahiResolverEvent event, - AVAHI_GCC_UNUSED const AvahiAddress *a, - const char *hostname, - AVAHI_GCC_UNUSED AvahiLookupResultFlags flags, - void* userdata) { - - Client *c = userdata; - - assert(c); - - if (event == AVAHI_RESOLVER_FAILURE) - client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server))); - else if (event == AVAHI_RESOLVER_FOUND) - client_output_printf(c, "+ %i %u %s\n", iface, protocol, hostname); - - c->state = CLIENT_DEAD; -} - -static void dns_server_browser_callback( - AVAHI_GCC_UNUSED AvahiSDNSServerBrowser *b, - AvahiIfIndex interface, - AvahiProtocol protocol, - AvahiBrowserEvent event, - AVAHI_GCC_UNUSED const char *host_name, - const AvahiAddress *a, - uint16_t port, - AVAHI_GCC_UNUSED AvahiLookupResultFlags flags, - void* userdata) { - - Client *c = userdata; - char t[AVAHI_ADDRESS_STR_MAX]; - - assert(c); - - if (!a) - return; - - switch (event) { - case AVAHI_BROWSER_FAILURE: - client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server))); - c->state = CLIENT_DEAD; - break; - - case AVAHI_BROWSER_ALL_FOR_NOW: - case AVAHI_BROWSER_CACHE_EXHAUSTED: - break; - - case AVAHI_BROWSER_NEW: - case AVAHI_BROWSER_REMOVE: - - avahi_address_snprint(t, sizeof(t), a); - client_output_printf(c, "%c %i %u %s %u\n", event == AVAHI_BROWSER_NEW ? '>' : '<', interface, protocol, t, port); - break; - } -} - -static void handle_line(Client *c, const char *s) { - char cmd[64], arg[64]; - int n_args; - - assert(c); - assert(s); - - if (c->state != CLIENT_IDLE) - return; - - if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) { - client_output_printf(c, "%+i Failed to parse command, try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION); - c->state = CLIENT_DEAD; - return; - } - - if (strcmp(cmd, "HELP") == 0) { - client_output_printf(c, - "+ Available commands are:\n" - "+ RESOLVE-HOSTNAME <hostname>\n" - "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n" - "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n" - "+ RESOLVE-ADDRESS <address>\n" - "+ BROWSE-DNS-SERVERS\n" - "+ BROWSE-DNS-SERVERS-IPV4\n" - "+ BROWSE-DNS-SERVERS-IPV6\n"); - c->state = CLIENT_DEAD; } - else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) { - client_output_printf(c, "+ FUCK: Go fuck yourself!\n"); - c->state = CLIENT_DEAD; - } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) { - c->state = CLIENT_RESOLVE_HOSTNAME; - if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, arg, c->afquery = AVAHI_PROTO_INET, AVAHI_LOOKUP_USE_MULTICAST, host_name_resolver_callback, c))) - goto fail; - - avahi_log_debug(__FILE__": Got %s request for '%s'.", cmd, arg); - } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) { - c->state = CLIENT_RESOLVE_HOSTNAME; - if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, arg, c->afquery = AVAHI_PROTO_INET6, AVAHI_LOOKUP_USE_MULTICAST, host_name_resolver_callback, c))) - goto fail; - - avahi_log_debug(__FILE__": Got %s request for '%s'.", cmd, arg); - } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) { - c->state = CLIENT_RESOLVE_HOSTNAME; - if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, arg, c->afquery = AVAHI_PROTO_UNSPEC, AVAHI_LOOKUP_USE_MULTICAST, host_name_resolver_callback, c))) - goto fail; - - avahi_log_debug(__FILE__": Got %s request for '%s'.", cmd, arg); - } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) { - AvahiAddress addr; - - if (!(avahi_address_parse(arg, AVAHI_PROTO_UNSPEC, &addr))) { - client_output_printf(c, "%+i Failed to parse address \"%s\".\n", AVAHI_ERR_INVALID_ADDRESS, arg); - c->state = CLIENT_DEAD; - } else { - c->state = CLIENT_RESOLVE_ADDRESS; - if (!(c->address_resolver = avahi_s_address_resolver_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, &addr, AVAHI_LOOKUP_USE_MULTICAST, address_resolver_callback, c))) - goto fail; - } - - avahi_log_debug(__FILE__": Got %s request for '%s'.", cmd, arg); - - } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV4") == 0 && n_args == 1) { - c->state = CLIENT_BROWSE_DNS_SERVERS; - if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AVAHI_PROTO_INET, AVAHI_LOOKUP_USE_MULTICAST, dns_server_browser_callback, c))) - goto fail; - client_output_printf(c, "+ Browsing ...\n"); - - avahi_log_debug(__FILE__": Got %s request.", cmd); - - } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV6") == 0 && n_args == 1) { - c->state = CLIENT_BROWSE_DNS_SERVERS; - if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AVAHI_PROTO_INET6, AVAHI_LOOKUP_USE_MULTICAST, dns_server_browser_callback, c))) - goto fail; - client_output_printf(c, "+ Browsing ...\n"); - - avahi_log_debug(__FILE__": Got %s request.", cmd); - - } else if (strcmp(cmd, "BROWSE-DNS-SERVERS") == 0 && n_args == 1) { - c->state = CLIENT_BROWSE_DNS_SERVERS; - if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AVAHI_PROTO_UNSPEC, AVAHI_LOOKUP_USE_MULTICAST, dns_server_browser_callback, c))) - goto fail; - client_output_printf(c, "+ Browsing ...\n"); - - avahi_log_debug(__FILE__": Got %s request.", cmd); - - } else { - client_output_printf(c, "%+i Invalid command \"%s\", try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION, cmd); - c->state = CLIENT_DEAD; - - avahi_log_debug(__FILE__": Got invalid request '%s'.", cmd); - } - - return; - -fail: - client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server))); - c->state = CLIENT_DEAD; -} - -static void handle_input(Client *c) { - assert(c); - - for (;;) { - char *e; - size_t k; - - if (!(e = memchr(c->inbuf, '\n', c->inbuf_length))) - break; - - k = e - (char*) c->inbuf; - *e = 0; - - handle_line(c, c->inbuf); - c->inbuf_length -= k + 1; - memmove(c->inbuf, e+1, c->inbuf_length); - } -} - -static void client_work(AvahiWatch *watch, AVAHI_GCC_UNUSED int fd, AvahiWatchEvent events, void *userdata) { - Client *c = userdata; - - assert(c); - - if ((events & AVAHI_WATCH_IN) && c->inbuf_length < sizeof(c->inbuf)) { - ssize_t r; - - if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) { - if (r < 0) - avahi_log_warn("read(): %s", strerror(errno)); - client_free(c); - return; - } - - c->inbuf_length += r; - assert(c->inbuf_length <= sizeof(c->inbuf)); - - handle_input(c); - } - - if ((events & AVAHI_WATCH_OUT) && c->outbuf_length > 0) { - ssize_t r; - - if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) { - avahi_log_warn("write(): %s", strerror(errno)); - client_free(c); - return; - } - - assert((size_t) r <= c->outbuf_length); - c->outbuf_length -= r; - - if (c->outbuf_length) - memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r); - - if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) { - client_free(c); - return; - } - } - - c->server->poll_api->watch_update( - watch, - (c->outbuf_length > 0 ? AVAHI_WATCH_OUT : 0) | - (c->inbuf_length < sizeof(c->inbuf) ? AVAHI_WATCH_IN : 0)); -} - -static void server_work(AVAHI_GCC_UNUSED AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata) { - Server *s = userdata; - - assert(s); - - if (events & AVAHI_WATCH_IN) { - int cfd; - - if ((cfd = accept(fd, NULL, NULL)) < 0) - avahi_log_error("accept(): %s", strerror(errno)); - else - client_new(s, cfd); - } -} - -int simple_protocol_setup(const AvahiPoll *poll_api) { - struct sockaddr_un sa; - mode_t u; - - assert(!server); - - server = avahi_new(Server, 1); - server->poll_api = poll_api; - server->bind_successful = 0; - server->fd = -1; - server->n_clients = 0; - AVAHI_LLIST_HEAD_INIT(Client, server->clients); - server->watch = NULL; - - u = umask(0000); - - if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) { - avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno)); - goto fail; - } - - memset(&sa, 0, sizeof(sa)); - sa.sun_family = AF_LOCAL; - strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1); - - /* We simply remove existing UNIX sockets under this name. The - Avahi daemons makes sure that it runs only once on a host, - therefore sockets that already exist are stale and may be - removed without any ill effects */ - - unlink(AVAHI_SOCKET); - - if (bind(server->fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) { - avahi_log_warn("bind(): %s", strerror(errno)); - goto fail; - } - - server->bind_successful = 1; - - if (listen(server->fd, 2) < 0) { - avahi_log_warn("listen(): %s", strerror(errno)); - goto fail; - } - - umask(u); - - server->watch = poll_api->watch_new(poll_api, server->fd, AVAHI_WATCH_IN, server_work, server); - - return 0; - -fail: - - umask(u); - simple_protocol_shutdown(); - - return -1; -} - -void simple_protocol_shutdown(void) { - - if (server) { - - if (server->bind_successful) -#ifdef ENABLE_CHROOT - avahi_chroot_helper_unlink(AVAHI_SOCKET); -#else - unlink(AVAHI_SOCKET); -#endif - - while (server->clients) - client_free(server->clients); - - if (server->watch) - server->poll_api->watch_free(server->watch); - - if (server->fd >= 0) - close(server->fd); - - avahi_free(server); - - server = NULL; - } -} - -void simple_protocol_restart_queries(void) { - Client *c; - - /* Restart queries in case of local domain name changes */ - - assert(server); - - for (c = server->clients; c; c = c->clients_next) - if (c->state == CLIENT_BROWSE_DNS_SERVERS && c->dns_server_browser) { - avahi_s_dns_server_browser_free(c->dns_server_browser); - c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery, AVAHI_LOOKUP_USE_MULTICAST, dns_server_browser_callback, c); - } -} - - |