Impelement AvahiServiceResolver

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@88 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

1 files changed, 269 insertions, 0 deletions

diff --git a/avahi-core/resolve-service.c b/avahi-core/resolve-service.c
new file mode 100644
index 0000000..5c0c988
--- /dev/null
+++ b/avahi-core/resolve-service.c
@@ -0,0 +1,269 @@
+/* $Id$ */
+
+/***
+  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 "browse.h"
+#include "util.h"
+
+struct AvahiServiceResolver {
+    AvahiServer *server;
+    gchar *service_name;
+    gchar *service_type;
+    gchar *domain_name;
+    guchar address_protocol;
+
+    gint interface;
+    guchar protocol;
+
+    AvahiRecordBrowser *record_browser_srv;
+    AvahiRecordBrowser *record_browser_txt;
+    AvahiRecordBrowser *record_browser_a;
+    AvahiRecordBrowser *record_browser_aaaa;
+
+    AvahiRecord *srv_record, *txt_record, *address_record;
+    
+    AvahiServiceResolverCallback callback;
+    gpointer userdata;
+
+    AvahiTimeEvent *time_event;
+
+    AVAHI_LLIST_FIELDS(AvahiServiceResolver, resolver);
+};
+
+static void finish(AvahiServiceResolver *r, AvahiResolverEvent event) {
+    g_assert(r);
+
+    if (r->record_browser_a) {
+        avahi_record_browser_free(r->record_browser_a);
+        r->record_browser_a = NULL;
+    }
+
+    if (r->record_browser_aaaa) {
+        avahi_record_browser_free(r->record_browser_aaaa);
+        r->record_browser_aaaa = NULL;
+    }
+
+    if (r->record_browser_srv) {
+        avahi_record_browser_free(r->record_browser_srv);
+        r->record_browser_srv = NULL;
+    }
+
+    if (r->record_browser_txt) {
+        avahi_record_browser_free(r->record_browser_txt);
+        r->record_browser_txt = NULL;
+    }
+    
+    avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
+    r->time_event = NULL;
+
+    if (event == AVAHI_RESOLVER_TIMEOUT)
+        r->callback(r, r->interface, r->protocol, event, r->service_name, r->service_type, r->domain_name, NULL, NULL, 0, NULL, r->userdata);
+    else {
+        AvahiAddress a;
+        gchar sn[256], st[256];
+        size_t i;
+        
+        g_assert(r->srv_record);
+        g_assert(r->txt_record);
+        g_assert(r->address_record);
+        
+        switch (r->address_record->key->type) {
+            case AVAHI_DNS_TYPE_A:
+                a.family = AF_INET;
+                a.data.ipv4 = r->address_record->data.a.address;
+                break;
+                
+            case AVAHI_DNS_TYPE_AAAA:
+                a.family = AF_INET6;
+                a.data.ipv6 = r->address_record->data.aaaa.address;
+                break;
+                
+            default:
+                g_assert(FALSE);
+        }
+
+        snprintf(sn, sizeof(sn), r->service_name);
+        snprintf(st, sizeof(st), r->service_type);
+
+        if ((i = strlen(sn)) > 0 && sn[i-1] == '.')
+            sn[i-1] = 0;
+
+        if ((i = strlen(st)) > 0 && st[i-1] == '.')
+            st[i-1] = 0;
+
+        r->callback(r, r->interface, r->protocol, event, sn, st, r->domain_name, r->srv_record->data.srv.name, &a, r->srv_record->data.srv.port, r->txt_record->data.txt.string_list, r->userdata);
+
+    }
+}
+
+static void record_browser_callback(AvahiRecordBrowser*rr, gint interface, guchar protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
+    AvahiServiceResolver *r = userdata;
+
+    g_assert(rr);
+    g_assert(record);
+    g_assert(r);
+
+    if (!(event == AVAHI_BROWSER_NEW))
+        return;
+
+    if (r->interface > 0 && interface != r->interface)
+        return;
+
+    if (r->protocol != AF_UNSPEC && protocol != r->protocol)
+        return;
+    
+    if (r->interface <= 0)
+        r->interface = interface;
+
+    if (r->protocol == AF_UNSPEC)
+        r->protocol = protocol;
+    
+    switch (record->key->type) {
+        case AVAHI_DNS_TYPE_SRV:
+            if (!r->srv_record) {
+                r->srv_record = avahi_record_ref(record);
+
+                g_assert(!r->record_browser_a && !r->record_browser_aaaa);
+                
+                if (r->address_protocol == AF_INET || r->address_protocol == AF_UNSPEC) {
+                    AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
+                    r->record_browser_a = avahi_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
+                    avahi_key_unref(k);
+                } 
+                
+                if (r->address_protocol == AF_INET6 || r->address_protocol == AF_UNSPEC) {
+                    AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
+                    r->record_browser_aaaa = avahi_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
+                    avahi_key_unref(k);
+                }
+            }
+            break;
+            
+        case AVAHI_DNS_TYPE_TXT:
+            if (!r->txt_record)
+                r->txt_record = avahi_record_ref(record);
+            break;
+
+        case AVAHI_DNS_TYPE_A:
+        case AVAHI_DNS_TYPE_AAAA:
+            if (!r->address_record)
+                r->address_record = avahi_record_ref(record);
+            break;
+            
+        default:
+            g_assert(FALSE);
+    }
+
+    if (r->txt_record && r->srv_record && r->address_record)
+        finish(r, AVAHI_RESOLVER_FOUND);
+}
+
+static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
+    AvahiServiceResolver *r = userdata;
+    
+    g_assert(e);
+    g_assert(r);
+
+    finish(r, AVAHI_RESOLVER_TIMEOUT);
+}
+
+AvahiServiceResolver *avahi_service_resolver_new(AvahiServer *server, gint interface, guchar protocol, const gchar *name, const gchar *type, const gchar *domain, guchar aprotocol, AvahiServiceResolverCallback callback, gpointer userdata) {
+    AvahiServiceResolver *r;
+    AvahiKey *k;
+    GTimeVal tv;
+    gchar t[256], *n;
+    size_t l;
+    
+    g_assert(server);
+    g_assert(name);
+    g_assert(type);
+    g_assert(callback);
+
+    g_assert(aprotocol == AF_UNSPEC || aprotocol == AF_INET || aprotocol == AF_INET6);
+
+    r = g_new(AvahiServiceResolver, 1);
+    r->server = server;
+    r->service_name = avahi_normalize_name(name);
+    r->service_type = avahi_normalize_name(type);
+    r->domain_name = avahi_normalize_name(domain);
+    r->callback = callback;
+    r->userdata = userdata;
+    r->address_protocol = aprotocol;
+    r->srv_record = r->txt_record = r->address_record = NULL;
+    r->interface = interface;
+    r->protocol = protocol;
+    
+    n = t;
+    l = sizeof(t);
+    avahi_escape_label((guint8*) name, strlen(name), &n, &l);
+    snprintf(n, l, ".%s%s", r->service_type, r->domain_name);
+
+    g_message("<%s>", t);
+    
+    k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
+    r->record_browser_srv = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
+    avahi_key_unref(k);
+
+    k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
+    r->record_browser_txt = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
+    avahi_key_unref(k);
+    
+    r->record_browser_a = r->record_browser_aaaa = NULL;
+    
+    avahi_elapse_time(&tv, 1000, 0);
+    r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
+    
+    AVAHI_LLIST_PREPEND(AvahiServiceResolver, resolver, server->service_resolvers, r);
+    
+    return r;
+}
+
+void avahi_service_resolver_free(AvahiServiceResolver *r) {
+    g_assert(r);
+
+    AVAHI_LLIST_REMOVE(AvahiServiceResolver, resolver, r->server->service_resolvers, r);
+
+    if (r->record_browser_srv)
+        avahi_record_browser_free(r->record_browser_srv);
+    if (r->record_browser_txt)
+        avahi_record_browser_free(r->record_browser_txt);
+    if (r->record_browser_a)
+        avahi_record_browser_free(r->record_browser_a);
+    if (r->record_browser_aaaa)
+        avahi_record_browser_free(r->record_browser_aaaa);
+
+    if (r->srv_record)
+        avahi_record_unref(r->srv_record);
+    if (r->txt_record)
+        avahi_record_unref(r->txt_record);
+    if (r->address_record)
+        avahi_record_unref(r->address_record);
+    
+    g_free(r->service_name);
+    g_free(r->service_type);
+    g_free(r->domain_name);
+    g_free(r);
+}