Index: avahi-daemon/simple-protocol.c
===================================================================
--- avahi-daemon/simple-protocol.c (nonexistent)
+++ avahi-daemon/simple-protocol.c (revision 331)
@@ -0,0 +1,573 @@
+/***
+ 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;
+ }
+ }
+
+ if (events & AVAHI_WATCH_HUP) {
+ 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);
+ }
+}
Radix cross Linux
The main Radix cross Linux repository contains the build scripts of packages, which have the most complete and common functionality for desktop machines
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