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-rw-r--r--avahi-daemon/static-hosts.c107
1 files changed, 73 insertions, 34 deletions
diff --git a/avahi-daemon/static-hosts.c b/avahi-daemon/static-hosts.c
index ebc358d..c0a5952 100644
--- a/avahi-daemon/static-hosts.c
+++ b/avahi-daemon/static-hosts.c
@@ -40,13 +40,16 @@ typedef struct StaticHost StaticHost;
struct StaticHost {
AvahiSEntryGroup *group;
+ int iteration;
- char *host, *ip;
+ 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);
@@ -86,7 +89,7 @@ static StaticHost *static_host_new(void) {
s->group = NULL;
s->host = NULL;
- s->ip = NULL;
+ s->iteration = current_iteration;
AVAHI_LLIST_PREPEND(StaticHost, hosts, hosts, s);
@@ -102,17 +105,25 @@ static void static_host_free(StaticHost *s) {
avahi_s_entry_group_free (s->group);
avahi_free(s->host);
- avahi_free(s->ip);
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)
{
- AvahiAddress a;
- AvahiProtocol p;
- int err;
- const AvahiServerConfig *config;
if (!h->group)
if (!(h->group = avahi_s_entry_group_new (avahi_server, entry_group_callback, h))) {
@@ -120,22 +131,22 @@ static void add_static_host_to_server(StaticHost *h)
return;
}
- if (!avahi_address_parse (h->ip, AVAHI_PROTO_UNSPEC, &a)) {
- avahi_log_error("Static host name %s: avahi_address_parse failed", h->host);
- 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;
+ }
- config = avahi_server_get_config(avahi_server);
-
- p = (a.proto == AVAHI_PROTO_INET && config->publish_a_on_ipv6) ||
- (a.proto == AVAHI_PROTO_INET6 && config->publish_aaaa_on_ipv4) ? AVAHI_PROTO_UNSPEC : a.proto;
-
- if ((err = avahi_server_add_address(avahi_server, h->group, AVAHI_IF_UNSPEC, p, 0, h->host, &a)) < 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);
}
-
- avahi_s_entry_group_commit (h->group);
}
static void remove_static_host_from_server(StaticHost *h)
@@ -147,36 +158,36 @@ static void remove_static_host_from_server(StaticHost *h)
void static_hosts_add_to_server(void) {
StaticHost *h;
- for (h = hosts; h; h = h->hosts_next) {
+ 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) {
+ 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;
- const char *filename = (in_chroot ? "/hosts" : AVAHI_CONFIG_DIR "/hosts");
+ StaticHost *h, *next;
+ const char *filename = in_chroot ? "/hosts" : AVAHI_CONFIG_DIR "/hosts";
- if (!(f = fopen(filename, "r")))
- {
+ 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;
- StaticHost *h;
+ AvahiAddress a;
if (!fgets(ln, sizeof (ln), f))
break;
@@ -209,7 +220,7 @@ void static_hosts_load(int in_chroot) {
avahi_log_error("%s:%d: Error, unexpected end of line!", filename, line);
avahi_free(host);
avahi_free(ip);
- break;
+ goto fail;
}
/* Skip over the host */
@@ -223,14 +234,42 @@ void static_hosts_load(int in_chroot) {
avahi_log_error ("%s:%d: Junk on the end of the line!", filename, line);
avahi_free(host);
avahi_free(ip);
- break;
+ goto fail;
}
- h = static_host_new();
- h->host = host;
- h->ip = ip;
+ 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);
}