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#include <string.h>
#include <avahi-common/error.h>
#include <avahi-common/alternative.h>
#include <avahi-glib/glib-malloc.h>
#include "lassi-avahi.h"
#define SERVICE_TYPE "_mango-lassi._tcp"
/* FIXME: Error and collision handling is suboptimal */
static void resolve_cb(
AvahiServiceResolver *r,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiResolverEvent event,
const char *name,
const char *type,
const char *domain,
const char *host_name,
const AvahiAddress *address,
uint16_t port,
AvahiStringList *txt,
AvahiLookupResultFlags flags,
void* userdata) {
LassiAvahiInfo *i = userdata;
g_assert(r);
g_assert(i);
/* Called whenever a service has been resolved successfully or timed out */
switch (event) {
case AVAHI_RESOLVER_FOUND: {
char a[AVAHI_ADDRESS_STR_MAX], *t;
avahi_address_snprint(a, sizeof(a), address);
t = g_strdup_printf("tcp:port=%u,host=%s", port, a);
lassi_server_connect(i->server, t);
g_free(t);
break;
}
case AVAHI_RESOLVER_FAILURE:
g_message("Failed to resolve service '%s' of type '%s' in domain '%s': %s", name, type, domain, avahi_strerror(avahi_client_errno(i->client)));
break;
}
avahi_service_resolver_free(r);
}
static void browse_cb(
AvahiServiceBrowser *b,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiBrowserEvent event,
const char *name,
const char *type,
const char *domain,
AvahiLookupResultFlags flags,
void* userdata) {
LassiAvahiInfo *i = userdata;
g_assert(b);
g_assert(i);
switch (event) {
case AVAHI_BROWSER_NEW:
if (!(flags & AVAHI_LOOKUP_RESULT_OUR_OWN))
if (!(avahi_service_resolver_new(i->client, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolve_cb, i)))
g_message("Failed to resolve service '%s': %s", name, avahi_strerror(avahi_client_errno(i->client)));
break;
case AVAHI_BROWSER_REMOVE:
case AVAHI_BROWSER_ALL_FOR_NOW:
case AVAHI_BROWSER_CACHE_EXHAUSTED:
break;
case AVAHI_BROWSER_FAILURE:
g_message("Browsing failed: %s", avahi_strerror(avahi_client_errno(i->client)));
break;
}
}
static void create_service(LassiAvahiInfo *i);
static void entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
LassiAvahiInfo *i = userdata;
g_assert(g);
g_assert(i);
i->group = g;
switch (state) {
case AVAHI_ENTRY_GROUP_ESTABLISHED :
g_message("Service '%s' successfully established.", i->service_name);
break;
case AVAHI_ENTRY_GROUP_COLLISION : {
char *n;
n = avahi_alternative_service_name(i->service_name);
avahi_free(i->service_name);
i->service_name = n;
g_message("Service name collision, renaming service to '%s'", n);
/* And recreate the services */
create_service(i);
break;
}
case AVAHI_ENTRY_GROUP_FAILURE :
g_message("Entry group failure: %s", avahi_strerror(avahi_client_errno(i->client)));
break;
case AVAHI_ENTRY_GROUP_UNCOMMITED:
case AVAHI_ENTRY_GROUP_REGISTERING:
;
}
}
static void create_service(LassiAvahiInfo *i) {
g_assert(i);
if (!i->group)
if (!(i->group = avahi_entry_group_new(i->client, entry_group_callback, i))) {
g_message("avahi_entry_group_new() failed: %s", avahi_strerror(avahi_client_errno(i->client)));
return;
}
if (avahi_entry_group_is_empty(i->group)) {
int ret;
if (!i->service_name)
i->service_name = g_strdup(i->server->id);
if ((ret = avahi_entry_group_add_service(i->group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, i->service_name, SERVICE_TYPE, NULL, NULL, i->server->port, NULL)) < 0) {
g_message("Failed to add service: %s", avahi_strerror(ret));
return;
}
if ((ret = avahi_entry_group_commit(i->group)) < 0) {
g_message("Failed to commit entry group: %s", avahi_strerror(ret));
return;
}
}
}
static void client_cb(AvahiClient *client, AvahiClientState state, void *userdata) {
LassiAvahiInfo *i = userdata;
i->client = client;
switch (state) {
case AVAHI_CLIENT_S_RUNNING:
if (!i->group)
create_service(i);
break;
case AVAHI_CLIENT_FAILURE:
g_message("Client failure: %s", avahi_strerror(avahi_client_errno(client)));
break;
case AVAHI_CLIENT_S_COLLISION:
case AVAHI_CLIENT_S_REGISTERING:
if (i->group)
avahi_entry_group_reset(i->group);
break;
case AVAHI_CLIENT_CONNECTING:
;
}
}
int lassi_avahi_init(LassiAvahiInfo *i, LassiServer *server) {
int error;
g_assert(i);
g_assert(server);
memset(i, 0, sizeof(*i));
i->server = server;
avahi_set_allocator(avahi_glib_allocator());
if (!(i->poll = avahi_glib_poll_new(NULL, G_PRIORITY_DEFAULT))) {
g_message("avahi_glib_poll_new() failed.");
goto fail;
}
if (!(i->client = avahi_client_new(avahi_glib_poll_get(i->poll), 0, client_cb, i, &error))) {
g_message("avahi_client_new() failed: %s", avahi_strerror(error));
goto fail;
}
if (!(i->browser = avahi_service_browser_new(i->client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, SERVICE_TYPE, NULL, 0, browse_cb, i))) {
g_message("avahi_service_browser_new(): %s", avahi_strerror(avahi_client_errno(i->client)));
goto fail;
}
return 0;
fail:
lassi_avahi_done(i);
return -1;
}
void lassi_avahi_done(LassiAvahiInfo *i) {
g_assert(i);
if (i->client)
avahi_client_free(i->client);
if (i->poll)
avahi_glib_poll_free(i->poll);
g_free(i->service_name);
memset(i, 0, sizeof(*i));
}
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