744 lines
19 KiB
C
744 lines
19 KiB
C
/***
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This file is part of avahi.
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avahi is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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avahi is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with avahi; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/stat.h>
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#include <glob.h>
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#include <limits.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#ifdef USE_EXPAT_H
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#include <expat.h>
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#endif /* USE_EXPAT_H */
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#ifdef USE_BSDXML_H
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#include <bsdxml.h>
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#endif /* USE_BSDXML_H */
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#include <avahi-common/llist.h>
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#include "avahi-common/avahi-malloc.h"
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#include <avahi-common/alternative.h>
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#include <avahi-common/error.h>
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#include <avahi-common/domain.h>
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#include <avahi-core/log.h>
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#include <avahi-core/publish.h>
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#include "main.h"
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#include "static-services.h"
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typedef struct StaticService StaticService;
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typedef struct StaticServiceGroup StaticServiceGroup;
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struct StaticService {
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StaticServiceGroup *group;
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char *type;
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char *domain_name;
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char *host_name;
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uint16_t port;
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int protocol;
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AvahiStringList *subtypes;
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AvahiStringList *txt_records;
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AVAHI_LLIST_FIELDS(StaticService, services);
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};
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struct StaticServiceGroup {
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char *filename;
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time_t mtime;
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char *name, *chosen_name;
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int replace_wildcards;
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AvahiSEntryGroup *entry_group;
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AVAHI_LLIST_HEAD(StaticService, services);
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AVAHI_LLIST_FIELDS(StaticServiceGroup, groups);
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};
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static AVAHI_LLIST_HEAD(StaticServiceGroup, groups) = NULL;
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static char *replacestr(const char *pattern, const char *a, const char *b) {
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char *r = NULL, *e, *n;
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while ((e = strstr(pattern, a))) {
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char *k;
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k = avahi_strndup(pattern, e - pattern);
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if (r)
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n = avahi_strdup_printf("%s%s%s", r, k, b);
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else
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n = avahi_strdup_printf("%s%s", k, b);
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avahi_free(k);
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avahi_free(r);
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r = n;
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pattern = e + strlen(a);
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}
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if (!r)
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return avahi_strdup(pattern);
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n = avahi_strdup_printf("%s%s", r, pattern);
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avahi_free(r);
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return n;
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}
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static void add_static_service_group_to_server(StaticServiceGroup *g);
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static void remove_static_service_group_from_server(StaticServiceGroup *g);
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static StaticService *static_service_new(StaticServiceGroup *group) {
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StaticService *s;
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assert(group);
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s = avahi_new(StaticService, 1);
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s->group = group;
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s->type = s->host_name = s->domain_name = NULL;
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s->port = 0;
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s->protocol = AVAHI_PROTO_UNSPEC;
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s->txt_records = NULL;
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s->subtypes = NULL;
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AVAHI_LLIST_PREPEND(StaticService, services, group->services, s);
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return s;
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}
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static StaticServiceGroup *static_service_group_new(char *filename) {
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StaticServiceGroup *g;
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assert(filename);
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g = avahi_new(StaticServiceGroup, 1);
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g->filename = avahi_strdup(filename);
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g->mtime = 0;
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g->name = g->chosen_name = NULL;
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g->replace_wildcards = 0;
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g->entry_group = NULL;
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AVAHI_LLIST_HEAD_INIT(StaticService, g->services);
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AVAHI_LLIST_PREPEND(StaticServiceGroup, groups, groups, g);
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return g;
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}
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static void static_service_free(StaticService *s) {
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assert(s);
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AVAHI_LLIST_REMOVE(StaticService, services, s->group->services, s);
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avahi_free(s->type);
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avahi_free(s->host_name);
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avahi_free(s->domain_name);
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avahi_string_list_free(s->txt_records);
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avahi_string_list_free(s->subtypes);
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avahi_free(s);
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}
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static void static_service_group_free(StaticServiceGroup *g) {
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assert(g);
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if (g->entry_group)
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avahi_s_entry_group_free(g->entry_group);
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while (g->services)
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static_service_free(g->services);
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AVAHI_LLIST_REMOVE(StaticServiceGroup, groups, groups, g);
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avahi_free(g->filename);
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avahi_free(g->name);
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avahi_free(g->chosen_name);
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avahi_free(g);
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}
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static void entry_group_callback(AvahiServer *s, AVAHI_GCC_UNUSED AvahiSEntryGroup *eg, AvahiEntryGroupState state, void* userdata) {
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StaticServiceGroup *g = userdata;
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assert(s);
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assert(g);
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switch (state) {
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case AVAHI_ENTRY_GROUP_COLLISION: {
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char *n;
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remove_static_service_group_from_server(g);
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n = avahi_alternative_service_name(g->chosen_name);
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avahi_free(g->chosen_name);
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g->chosen_name = n;
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avahi_log_notice("Service name conflict for \"%s\" (%s), retrying with \"%s\".", g->name, g->filename, g->chosen_name);
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add_static_service_group_to_server(g);
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break;
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}
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case AVAHI_ENTRY_GROUP_ESTABLISHED:
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avahi_log_info("Service \"%s\" (%s) successfully established.", g->chosen_name, g->filename);
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break;
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case AVAHI_ENTRY_GROUP_FAILURE:
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avahi_log_warn("Failed to publish service \"%s\" (%s): %s", g->chosen_name, g->filename, avahi_strerror(avahi_server_errno(s)));
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remove_static_service_group_from_server(g);
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break;
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case AVAHI_ENTRY_GROUP_UNCOMMITED:
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case AVAHI_ENTRY_GROUP_REGISTERING:
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;
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}
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}
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static void add_static_service_group_to_server(StaticServiceGroup *g) {
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StaticService *s;
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assert(g);
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if (g->entry_group && !avahi_s_entry_group_is_empty(g->entry_group))
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/* This service group is already registered in the server */
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return;
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if (!g->chosen_name || (g->replace_wildcards && strstr(g->name, "%h"))) {
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avahi_free(g->chosen_name);
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if (g->replace_wildcards) {
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char label[AVAHI_LABEL_MAX];
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const char *p;
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p = avahi_server_get_host_name(avahi_server);
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avahi_unescape_label(&p, label, sizeof(label));
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g->chosen_name = replacestr(g->name, "%h", label);
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} else
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g->chosen_name = avahi_strdup(g->name);
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}
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if (!g->entry_group)
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g->entry_group = avahi_s_entry_group_new(avahi_server, entry_group_callback, g);
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assert(avahi_s_entry_group_is_empty(g->entry_group));
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for (s = g->services; s; s = s->services_next) {
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AvahiStringList *i;
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if (avahi_server_add_service_strlst(
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avahi_server,
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g->entry_group,
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AVAHI_IF_UNSPEC, s->protocol,
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0,
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g->chosen_name, s->type, s->domain_name,
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s->host_name, s->port,
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s->txt_records) < 0) {
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avahi_log_error("Failed to add service '%s' of type '%s', ignoring service group (%s): %s",
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g->chosen_name, s->type, g->filename,
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avahi_strerror(avahi_server_errno(avahi_server)));
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remove_static_service_group_from_server(g);
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return;
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}
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for (i = s->subtypes; i; i = i->next) {
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if (avahi_server_add_service_subtype(
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avahi_server,
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g->entry_group,
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AVAHI_IF_UNSPEC, s->protocol,
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0,
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g->chosen_name, s->type, s->domain_name,
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(char*) i->text) < 0) {
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avahi_log_error("Failed to add subtype '%s' for service '%s' of type '%s', ignoring subtype (%s): %s",
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i->text, g->chosen_name, s->type, g->filename,
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avahi_strerror(avahi_server_errno(avahi_server)));
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}
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}
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}
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avahi_s_entry_group_commit(g->entry_group);
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}
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static void remove_static_service_group_from_server(StaticServiceGroup *g) {
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assert(g);
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if (g->entry_group)
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avahi_s_entry_group_reset(g->entry_group);
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}
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typedef enum {
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XML_TAG_INVALID,
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XML_TAG_SERVICE_GROUP,
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XML_TAG_NAME,
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XML_TAG_SERVICE,
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XML_TAG_TYPE,
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XML_TAG_SUBTYPE,
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XML_TAG_DOMAIN_NAME,
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XML_TAG_HOST_NAME,
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XML_TAG_PORT,
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XML_TAG_TXT_RECORD
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} xml_tag_name;
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struct xml_userdata {
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StaticServiceGroup *group;
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StaticService *service;
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xml_tag_name current_tag;
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int failed;
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char *buf;
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};
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#ifndef XMLCALL
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#define XMLCALL
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#endif
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static void XMLCALL xml_start(void *data, const char *el, const char *attr[]) {
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struct xml_userdata *u = data;
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assert(u);
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if (u->failed)
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return;
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if (u->current_tag == XML_TAG_INVALID && strcmp(el, "service-group") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_SERVICE_GROUP;
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} else if (u->current_tag == XML_TAG_SERVICE_GROUP && strcmp(el, "name") == 0) {
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u->current_tag = XML_TAG_NAME;
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if (attr[0]) {
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if (strcmp(attr[0], "replace-wildcards") == 0)
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u->group->replace_wildcards = strcmp(attr[1], "yes") == 0;
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else
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goto invalid_attr;
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if (attr[2])
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goto invalid_attr;
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}
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} else if (u->current_tag == XML_TAG_SERVICE_GROUP && strcmp(el, "service") == 0) {
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u->current_tag = XML_TAG_SERVICE;
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assert(!u->service);
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u->service = static_service_new(u->group);
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if (attr[0]) {
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if (strcmp(attr[0], "protocol") == 0) {
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AvahiProtocol protocol;
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if (strcmp(attr[1], "ipv4") == 0) {
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protocol = AVAHI_PROTO_INET;
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} else if (strcmp(attr[1], "ipv6") == 0) {
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protocol = AVAHI_PROTO_INET6;
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} else if (strcmp(attr[1], "any") == 0) {
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protocol = AVAHI_PROTO_UNSPEC;
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} else {
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avahi_log_error("%s: parse failure: invalid protocol specification \"%s\".", u->group->filename, attr[1]);
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u->failed = 1;
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return;
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}
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u->service->protocol = protocol;
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} else
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goto invalid_attr;
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if (attr[2])
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goto invalid_attr;
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}
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} else if (u->current_tag == XML_TAG_SERVICE && strcmp(el, "type") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_TYPE;
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} else if (u->current_tag == XML_TAG_SERVICE && strcmp(el, "subtype") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_SUBTYPE;
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} else if (u->current_tag == XML_TAG_SERVICE && strcmp(el, "domain-name") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_DOMAIN_NAME;
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} else if (u->current_tag == XML_TAG_SERVICE && strcmp(el, "host-name") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_HOST_NAME;
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} else if (u->current_tag == XML_TAG_SERVICE && strcmp(el, "port") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_PORT;
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} else if (u->current_tag == XML_TAG_SERVICE && strcmp(el, "txt-record") == 0) {
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if (attr[0])
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goto invalid_attr;
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u->current_tag = XML_TAG_TXT_RECORD;
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} else {
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avahi_log_error("%s: parse failure: didn't expect element <%s>.", u->group->filename, el);
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u->failed = 1;
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}
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return;
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invalid_attr:
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avahi_log_error("%s: parse failure: invalid attribute for element <%s>.", u->group->filename, el);
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u->failed = 1;
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return;
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}
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static void XMLCALL xml_end(void *data, AVAHI_GCC_UNUSED const char *el) {
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struct xml_userdata *u = data;
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assert(u);
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if (u->failed)
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return;
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switch (u->current_tag) {
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case XML_TAG_SERVICE_GROUP:
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if (!u->group->name || !u->group->services) {
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avahi_log_error("%s: parse failure: service group incomplete.", u->group->filename);
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u->failed = 1;
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return;
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}
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u->current_tag = XML_TAG_INVALID;
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break;
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case XML_TAG_SERVICE:
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if (!u->service->type) {
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avahi_log_error("%s: parse failure: service incomplete.", u->group->filename);
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u->failed = 1;
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return;
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}
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u->service = NULL;
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u->current_tag = XML_TAG_SERVICE_GROUP;
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break;
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case XML_TAG_NAME:
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u->current_tag = XML_TAG_SERVICE_GROUP;
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break;
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case XML_TAG_PORT: {
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int p;
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assert(u->service);
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p = u->buf ? atoi(u->buf) : 0;
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if (p < 0 || p > 0xFFFF) {
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avahi_log_error("%s: parse failure: invalid port specification \"%s\".", u->group->filename, u->buf);
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u->failed = 1;
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return;
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}
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u->service->port = (uint16_t) p;
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u->current_tag = XML_TAG_SERVICE;
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break;
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}
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case XML_TAG_TXT_RECORD: {
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assert(u->service);
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u->service->txt_records = avahi_string_list_add(u->service->txt_records, u->buf ? u->buf : "");
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u->current_tag = XML_TAG_SERVICE;
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break;
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}
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case XML_TAG_SUBTYPE: {
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assert(u->service);
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u->service->subtypes = avahi_string_list_add(u->service->subtypes, u->buf ? u->buf : "");
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u->current_tag = XML_TAG_SERVICE;
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break;
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}
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case XML_TAG_TYPE:
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case XML_TAG_DOMAIN_NAME:
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case XML_TAG_HOST_NAME:
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u->current_tag = XML_TAG_SERVICE;
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break;
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case XML_TAG_INVALID:
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;
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}
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avahi_free(u->buf);
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u->buf = NULL;
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}
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static char *append_cdata(char *t, const char *n, int length) {
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char *r, *k;
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if (!length)
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return t;
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k = avahi_strndup(n, length);
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if (t) {
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r = avahi_strdup_printf("%s%s", t, k);
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avahi_free(k);
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avahi_free(t);
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} else
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r = k;
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return r;
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}
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static void XMLCALL xml_cdata(void *data, const XML_Char *s, int len) {
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struct xml_userdata *u = data;
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assert(u);
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if (u->failed)
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return;
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switch (u->current_tag) {
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case XML_TAG_NAME:
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u->group->name = append_cdata(u->group->name, s, len);
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break;
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case XML_TAG_TYPE:
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assert(u->service);
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u->service->type = append_cdata(u->service->type, s, len);
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break;
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case XML_TAG_DOMAIN_NAME:
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assert(u->service);
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u->service->domain_name = append_cdata(u->service->domain_name, s, len);
|
|
break;
|
|
|
|
case XML_TAG_HOST_NAME:
|
|
assert(u->service);
|
|
u->service->host_name = append_cdata(u->service->host_name, s, len);
|
|
break;
|
|
|
|
case XML_TAG_PORT:
|
|
case XML_TAG_TXT_RECORD:
|
|
case XML_TAG_SUBTYPE:
|
|
assert(u->service);
|
|
u->buf = append_cdata(u->buf, s, len);
|
|
break;
|
|
|
|
case XML_TAG_SERVICE_GROUP:
|
|
case XML_TAG_SERVICE:
|
|
case XML_TAG_INVALID:
|
|
;
|
|
}
|
|
}
|
|
|
|
static int static_service_group_load(StaticServiceGroup *g) {
|
|
XML_Parser parser = NULL;
|
|
int fd = -1;
|
|
struct xml_userdata u;
|
|
int r = -1;
|
|
struct stat st;
|
|
ssize_t n;
|
|
|
|
assert(g);
|
|
|
|
u.buf = NULL;
|
|
u.group = g;
|
|
u.service = NULL;
|
|
u.current_tag = XML_TAG_INVALID;
|
|
u.failed = 0;
|
|
|
|
/* Cleanup old data in this service group, if available */
|
|
remove_static_service_group_from_server(g);
|
|
while (g->services)
|
|
static_service_free(g->services);
|
|
|
|
avahi_free(g->name);
|
|
avahi_free(g->chosen_name);
|
|
g->name = g->chosen_name = NULL;
|
|
g->replace_wildcards = 0;
|
|
|
|
if (!(parser = XML_ParserCreate(NULL))) {
|
|
avahi_log_error("XML_ParserCreate() failed.");
|
|
goto finish;
|
|
}
|
|
|
|
if ((fd = open(g->filename, O_RDONLY)) < 0) {
|
|
avahi_log_error("open(\"%s\", O_RDONLY): %s", g->filename, strerror(errno));
|
|
goto finish;
|
|
}
|
|
|
|
if (fstat(fd, &st) < 0) {
|
|
avahi_log_error("fstat(): %s", strerror(errno));
|
|
goto finish;
|
|
}
|
|
|
|
g->mtime = st.st_mtime;
|
|
|
|
XML_SetUserData(parser, &u);
|
|
|
|
XML_SetElementHandler(parser, xml_start, xml_end);
|
|
XML_SetCharacterDataHandler(parser, xml_cdata);
|
|
|
|
do {
|
|
void *buffer;
|
|
|
|
#define BUFSIZE (10*1024)
|
|
|
|
if (!(buffer = XML_GetBuffer(parser, BUFSIZE))) {
|
|
avahi_log_error("XML_GetBuffer() failed.");
|
|
goto finish;
|
|
}
|
|
|
|
if ((n = read(fd, buffer, BUFSIZE)) < 0) {
|
|
avahi_log_error("read(): %s\n", strerror(errno));
|
|
goto finish;
|
|
}
|
|
|
|
if (!XML_ParseBuffer(parser, n, n == 0)) {
|
|
avahi_log_error("XML_ParseBuffer() failed at line %d: %s.\n", (int) XML_GetCurrentLineNumber(parser), XML_ErrorString(XML_GetErrorCode(parser)));
|
|
goto finish;
|
|
}
|
|
|
|
} while (n != 0);
|
|
|
|
if (!u.failed)
|
|
r = 0;
|
|
|
|
finish:
|
|
|
|
if (fd >= 0)
|
|
close(fd);
|
|
|
|
if (parser)
|
|
XML_ParserFree(parser);
|
|
|
|
avahi_free(u.buf);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void load_file(char *n) {
|
|
StaticServiceGroup *g;
|
|
assert(n);
|
|
|
|
for (g = groups; g; g = g->groups_next)
|
|
if (strcmp(g->filename, n) == 0)
|
|
return;
|
|
|
|
avahi_log_info("Loading service file %s.", n);
|
|
|
|
g = static_service_group_new(n);
|
|
if (static_service_group_load(g) < 0) {
|
|
avahi_log_error("Failed to load service group file %s, ignoring.", g->filename);
|
|
static_service_group_free(g);
|
|
}
|
|
}
|
|
|
|
void static_service_load(int in_chroot) {
|
|
StaticServiceGroup *g, *n;
|
|
glob_t globbuf;
|
|
int globret;
|
|
char **p;
|
|
|
|
for (g = groups; g; g = n) {
|
|
struct stat st;
|
|
|
|
n = g->groups_next;
|
|
|
|
if (stat(g->filename, &st) < 0) {
|
|
|
|
if (errno == ENOENT)
|
|
avahi_log_info("Service group file %s vanished, removing services.", g->filename);
|
|
else
|
|
avahi_log_warn("Failed to stat() file %s, ignoring: %s", g->filename, strerror(errno));
|
|
|
|
static_service_group_free(g);
|
|
} else if (st.st_mtime != g->mtime) {
|
|
avahi_log_info("Service group file %s changed, reloading.", g->filename);
|
|
|
|
if (static_service_group_load(g) < 0) {
|
|
avahi_log_warn("Failed to load service group file %s, removing service.", g->filename);
|
|
static_service_group_free(g);
|
|
}
|
|
}
|
|
}
|
|
|
|
memset(&globbuf, 0, sizeof(globbuf));
|
|
|
|
if ((globret = glob(in_chroot ? "/services/*.service" : AVAHI_SERVICE_DIR "/*.service", GLOB_ERR, NULL, &globbuf)) != 0)
|
|
|
|
switch (globret) {
|
|
#ifdef GLOB_NOSPACE
|
|
case GLOB_NOSPACE:
|
|
avahi_log_error("Not enough memory to read service directory "AVAHI_SERVICE_DIR".");
|
|
break;
|
|
#endif
|
|
#ifdef GLOB_NOMATCH
|
|
case GLOB_NOMATCH:
|
|
avahi_log_info("No service file found in "AVAHI_SERVICE_DIR".");
|
|
break;
|
|
#endif
|
|
default:
|
|
avahi_log_error("Failed to read "AVAHI_SERVICE_DIR".");
|
|
break;
|
|
}
|
|
|
|
else {
|
|
for (p = globbuf.gl_pathv; *p; p++)
|
|
load_file(*p);
|
|
|
|
globfree(&globbuf);
|
|
}
|
|
}
|
|
|
|
void static_service_free_all(void) {
|
|
|
|
while (groups)
|
|
static_service_group_free(groups);
|
|
}
|
|
|
|
void static_service_add_to_server(void) {
|
|
StaticServiceGroup *g;
|
|
|
|
for (g = groups; g; g = g->groups_next)
|
|
add_static_service_group_to_server(g);
|
|
}
|
|
|
|
void static_service_remove_from_server(void) {
|
|
StaticServiceGroup *g;
|
|
|
|
for (g = groups; g; g = g->groups_next)
|
|
remove_static_service_group_from_server(g);
|
|
}
|