diff options
Diffstat (limited to 'release-0.6.9/avahi-daemon/simple-protocol.c')
| -rw-r--r-- | release-0.6.9/avahi-daemon/simple-protocol.c | 540 |
1 files changed, 540 insertions, 0 deletions
diff --git a/release-0.6.9/avahi-daemon/simple-protocol.c b/release-0.6.9/avahi-daemon/simple-protocol.c new file mode 100644 index 0000000..3cac713 --- /dev/null +++ b/release-0.6.9/avahi-daemon/simple-protocol.c @@ -0,0 +1,540 @@ +/* $Id$ */ + +/*** + 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 + +#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 for '%s'.", cmd, arg); + + } 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 for '%s'.", cmd, arg); + + } 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 for '%s'.", cmd, arg); + + } 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); + } +} + + |