/***
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 <string.h>
#include <errno.h>
#include <stdio.h>
#include <avahi-common/llist.h>
#include "avahi-common/avahi-malloc.h"
#include <avahi-common/error.h>
#include <avahi-core/log.h>
#include <avahi-core/publish.h>
#include "main.h"
#include "static-hosts.h"
typedef struct StaticHost StaticHost;
struct StaticHost {
AvahiSEntryGroup *group;
int iteration;
char *host;
AvahiAddress address;
AVAHI_LLIST_FIELDS(StaticHost, hosts);
};
static AVAHI_LLIST_HEAD(StaticHost, hosts) = NULL;
static int current_iteration = 0;
static void add_static_host_to_server(StaticHost *h);
static void remove_static_host_from_server(StaticHost *h);
static void entry_group_callback(AvahiServer *s, AVAHI_GCC_UNUSED AvahiSEntryGroup *eg, AvahiEntryGroupState state, void* userdata) {
StaticHost *h;
assert(s);
assert(eg);
h = userdata;
switch (state) {
case AVAHI_ENTRY_GROUP_COLLISION:
avahi_log_error("Host name conflict for \"%s\", not established.", h->host);
break;
case AVAHI_ENTRY_GROUP_ESTABLISHED:
avahi_log_notice ("Static host name \"%s\" successfully established.", h->host);
break;
case AVAHI_ENTRY_GROUP_FAILURE:
avahi_log_notice ("Failed to establish static host name \"%s\": %s.", h->host, avahi_strerror (avahi_server_errno (s)));
break;
case AVAHI_ENTRY_GROUP_UNCOMMITED:
case AVAHI_ENTRY_GROUP_REGISTERING:
;
}
}
static StaticHost *static_host_new(void) {
StaticHost *s;
s = avahi_new(StaticHost, 1);
s->group = NULL;
s->host = NULL;
s->iteration = current_iteration;
AVAHI_LLIST_PREPEND(StaticHost, hosts, hosts, s);
return s;
}
static void static_host_free(StaticHost *s) {
assert(s);
AVAHI_LLIST_REMOVE(StaticHost, hosts, hosts, s);
if (s->group)
avahi_s_entry_group_free (s->group);
avahi_free(s->host);
avahi_free(s);
}
static StaticHost *static_host_find(const char *host, const AvahiAddress *a) {
StaticHost *h;
assert(host);
assert(a);
for (h = hosts; h; h = h->hosts_next)
if (!strcmp(h->host, host) && !avahi_address_cmp(a, &h->address))
return h;
return NULL;
}
static void add_static_host_to_server(StaticHost *h)
{
if (!h->group)
if (!(h->group = avahi_s_entry_group_new (avahi_server, entry_group_callback, h))) {
avahi_log_error("avahi_s_entry_group_new() failed: %s", avahi_strerror(avahi_server_errno(avahi_server)));
return;
}
if (avahi_s_entry_group_is_empty(h->group)) {
AvahiProtocol p;
int err;
const AvahiServerConfig *config;
config = avahi_server_get_config(avahi_server);
p = (h->address.proto == AVAHI_PROTO_INET && config->publish_a_on_ipv6) ||
(h->address.proto == AVAHI_PROTO_INET6 && config->publish_aaaa_on_ipv4) ? AVAHI_PROTO_UNSPEC : h->address.proto;
if ((err = avahi_server_add_address(avahi_server, h->group, AVAHI_IF_UNSPEC, p, 0, h->host, &h->address)) < 0) {
avahi_log_error ("Static host name %s: avahi_server_add_address failure: %s", h->host, avahi_strerror(err));
return;
}
avahi_s_entry_group_commit (h->group);
}
}
static void remove_static_host_from_server(StaticHost *h)
{
if (h->group)
avahi_s_entry_group_reset (h->group);
}
void static_hosts_add_to_server(void) {
StaticHost *h;
for (h = hosts; h; h = h->hosts_next)
add_static_host_to_server(h);
}
void static_hosts_remove_from_server(void) {
StaticHost *h;
for (h = hosts; h; h = h->hosts_next)
remove_static_host_from_server(h);
}
void static_hosts_load(int in_chroot) {
FILE *f;
unsigned int line = 0;
StaticHost *h, *next;
const char *filename = AVAHI_HOSTS_FILE;
if (!(f = fopen(filename, "r"))) {
if (errno != ENOENT)
avahi_log_error ("Failed to open static hosts file: %s", strerror (errno));
return;
}
current_iteration++;
while (!feof(f)) {
unsigned int len;
char ln[256], *s;
char *host, *ip;
AvahiAddress a;
if (!fgets(ln, sizeof (ln), f))
break;
line++;
/* Find the start of the line, ignore whitespace */
s = ln + strspn(ln, " \t");
/* Set the end of the string to NULL */
s[strcspn(s, "#\r\n")] = 0;
/* Ignore blank lines */
if (*s == 0)
continue;
/* Read the first string (ip) up to the next whitespace */
len = strcspn(s, " \t");
ip = avahi_strndup(s, len);
/* Skip past it */
s += len;
/* Find the next token */
s += strspn(s, " \t");
len = strcspn(s, " \t");
host = avahi_strndup(s, len);
if (*host == 0)
{
avahi_log_error("%s:%d: Error, unexpected end of line!", filename, line);
avahi_free(host);
avahi_free(ip);
goto fail;
}
/* Skip over the host */
s += len;
/* Skip past any more spaces */
s += strspn(s, " \t");
/* Anything left? */
if (*s != 0) {
avahi_log_error ("%s:%d: Junk on the end of the line!", filename, line);
avahi_free(host);
avahi_free(ip);
goto fail;
}
if (!avahi_address_parse(ip, AVAHI_PROTO_UNSPEC, &a)) {
avahi_log_error("Static host name %s: failed to parse address %s", host, ip);
avahi_free(host);
avahi_free(ip);
goto fail;
}
avahi_free(ip);
if ((h = static_host_find(host, &a)))
avahi_free(host);
else {
h = static_host_new();
h->host = host;
h->address = a;
avahi_log_info("Loading new static hostname %s.", h->host);
}
h->iteration = current_iteration;
}
for (h = hosts; h; h = next) {
next = h->hosts_next;
if (h->iteration != current_iteration) {
avahi_log_info("Static hostname %s vanished, removing.", h->host);
static_host_free(h);
}
}
fail:
fclose(f);
}
void static_hosts_free_all (void)
{
while(hosts)
static_host_free(hosts);
}