+++ /dev/null
-/***
- 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"
-#include "sd-daemon.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 remove_socket;
-};
-
-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;
- int n;
-
- assert(!server);
-
- server = avahi_new(Server, 1);
- server->poll_api = poll_api;
- server->remove_socket = 0;
- server->fd = -1;
- server->n_clients = 0;
- AVAHI_LLIST_HEAD_INIT(Client, server->clients);
- server->watch = NULL;
-
- u = umask(0000);
-
- if ((n = sd_listen_fds(1)) < 0) {
- avahi_log_warn("Failed to acquire systemd file descriptors: %s", strerror(-n));
- goto fail;
- }
-
- if (n > 1) {
- avahi_log_warn("Too many systemd file descriptors passed.");
- goto fail;
- }
-
- if (n == 1) {
- int r;
-
- if ((r = sd_is_socket(SD_LISTEN_FDS_START, AF_LOCAL, SOCK_STREAM, 1)) < 0) {
- avahi_log_warn("Passed systemd file descriptor is of wrong type: %s", strerror(-r));
- goto fail;
- }
-
- server->fd = SD_LISTEN_FDS_START;
-
- } else {
-
- if ((server->fd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0) {
- avahi_log_warn("socket(AF_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 daemon 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->remove_socket = 1;
-
- if (listen(server->fd, SOMAXCONN) < 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->remove_socket)
-#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);
- }
-}
projects / catta / blobdiff