Branching for wide-area publishing work

  


git-svn-id: file:///home/lennart/svn/public/avahi/branches/federico@1344 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

1 files changed, 270 insertions, 0 deletions

diff --git a/trunk/avahi-core/resolve-address.c b/trunk/avahi-core/resolve-address.c
new file mode 100644
index 0000000..25d21ac
--- /dev/null
+++ b/trunk/avahi-core/resolve-address.c
@@ -0,0 +1,270 @@
+/* $Id$ */
+
+/***
+  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 <stdlib.h>
+
+#include <avahi-common/timeval.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/error.h>
+#include <avahi-common/domain.h>
+
+#include "browse.h"
+
+#define TIMEOUT_MSEC 5000
+
+struct AvahiSAddressResolver {
+    AvahiServer *server;
+    AvahiAddress address;
+    
+    AvahiSRecordBrowser *record_browser;
+
+    AvahiSAddressResolverCallback callback;
+    void* userdata;
+
+    AvahiRecord *ptr_record;
+    AvahiIfIndex interface;
+    AvahiProtocol protocol;
+    AvahiLookupResultFlags flags;
+
+    int retry_with_multicast;
+    AvahiKey *key;
+
+    AvahiTimeEvent *time_event;
+
+    AVAHI_LLIST_FIELDS(AvahiSAddressResolver, resolver);
+};
+
+static void finish(AvahiSAddressResolver *r, AvahiResolverEvent event) {
+    assert(r);
+    
+    if (r->time_event) {
+        avahi_time_event_free(r->time_event);
+        r->time_event = NULL;
+    }
+
+    switch (event) {
+        case AVAHI_RESOLVER_FAILURE:
+            r->callback(r, r->interface, r->protocol, event, &r->address, NULL, r->flags, r->userdata);
+            break;
+
+        case AVAHI_RESOLVER_FOUND:
+            assert(r->ptr_record);
+            r->callback(r, r->interface, r->protocol, event, &r->address, r->ptr_record->data.ptr.name, r->flags, r->userdata);
+            break;
+    }
+}
+
+static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
+    AvahiSAddressResolver *r = userdata;
+    
+    assert(e);
+    assert(r);
+
+    avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT);
+    finish(r, AVAHI_RESOLVER_FAILURE);
+}
+
+static void start_timeout(AvahiSAddressResolver *r) {
+    struct timeval tv;
+    assert(r);
+
+    if (r->time_event)
+        return;
+
+    avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
+    r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
+}
+
+static void record_browser_callback(
+    AvahiSRecordBrowser*rr,
+    AvahiIfIndex interface,
+    AvahiProtocol protocol,
+    AvahiBrowserEvent event,
+    AvahiRecord *record,
+    AvahiLookupResultFlags flags,
+    void* userdata) {
+    
+    AvahiSAddressResolver *r = userdata;
+
+    assert(rr);
+    assert(r);
+
+    switch (event) {
+        case AVAHI_BROWSER_NEW: 
+            assert(record);
+            assert(record->key->type == AVAHI_DNS_TYPE_PTR);
+            
+            if (r->interface > 0 && interface != r->interface)
+                return;
+            
+            if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
+                return;
+            
+            if (r->interface <= 0)
+                r->interface = interface;
+            
+            if (r->protocol == AVAHI_PROTO_UNSPEC)
+                r->protocol = protocol;
+            
+            if (!r->ptr_record) {
+                r->ptr_record = avahi_record_ref(record);
+                r->flags = flags;
+                
+                finish(r, AVAHI_RESOLVER_FOUND);
+            }
+            break;
+            
+        case AVAHI_BROWSER_REMOVE:
+            assert(record);
+            assert(record->key->type == AVAHI_DNS_TYPE_PTR);
+            
+            if (r->ptr_record && avahi_record_equal_no_ttl(record, r->ptr_record)) {
+                avahi_record_unref(r->ptr_record);
+                r->ptr_record = NULL;
+                r->flags = flags;
+                
+                /** Look for a replacement */
+                avahi_s_record_browser_restart(r->record_browser);
+                start_timeout(r);
+            }
+
+            break;
+            
+        case AVAHI_BROWSER_CACHE_EXHAUSTED:
+        case AVAHI_BROWSER_ALL_FOR_NOW:
+            break;
+
+        case AVAHI_BROWSER_FAILURE:
+
+            if (r->retry_with_multicast) {
+                r->retry_with_multicast = 0;
+
+                avahi_s_record_browser_free(r->record_browser);
+                r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_MULTICAST, record_browser_callback, r);
+
+                if (r->record_browser) {
+                    start_timeout(r);
+                    break;
+                }
+            }
+
+            r->flags = flags;
+            finish(r, AVAHI_RESOLVER_FAILURE);
+            break;
+    }
+}
+
+AvahiSAddressResolver *avahi_s_address_resolver_new(
+    AvahiServer *server,
+    AvahiIfIndex interface,
+    AvahiProtocol protocol,
+    const AvahiAddress *address,
+    AvahiLookupFlags flags,
+    AvahiSAddressResolverCallback callback,
+    void* userdata) {
+    
+    AvahiSAddressResolver *r;
+    AvahiKey *k;
+    char n[AVAHI_DOMAIN_NAME_MAX];
+
+    assert(server);
+    assert(address);
+    assert(callback);
+
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, address->proto == AVAHI_PROTO_INET || address->proto == AVAHI_PROTO_INET6, AVAHI_ERR_INVALID_PROTOCOL);
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
+    
+    avahi_reverse_lookup_name(address, n, sizeof(n));
+
+    if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) {
+        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+        return NULL;
+    }
+
+    if (!(r = avahi_new(AvahiSAddressResolver, 1))) {
+        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+        avahi_key_unref(k);
+        return NULL;
+    }
+    
+    r->server = server;
+    r->address = *address;
+    r->callback = callback;
+    r->userdata = userdata;
+    r->ptr_record = NULL;
+    r->interface = interface;
+    r->protocol = protocol;
+    r->flags = 0;
+    r->retry_with_multicast = 0;
+    r->key = k;
+
+    r->record_browser = NULL;
+    AVAHI_LLIST_PREPEND(AvahiSAddressResolver, resolver, server->address_resolvers, r);
+
+    r->time_event = NULL;
+
+    if (!(flags & (AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_USE_WIDE_AREA))) {
+
+        if (!server->wide_area_lookup_engine || !avahi_wide_area_has_servers(server->wide_area_lookup_engine))
+            flags |= AVAHI_LOOKUP_USE_MULTICAST;
+        else {
+            flags |= AVAHI_LOOKUP_USE_WIDE_AREA;
+            r->retry_with_multicast = 1;
+        }
+    }
+    
+    r->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
+
+    if (!r->record_browser) {
+        avahi_s_address_resolver_free(r);
+        return NULL;
+    }
+
+    start_timeout(r);
+    
+    return r;
+}
+
+void avahi_s_address_resolver_free(AvahiSAddressResolver *r) {
+    assert(r);
+
+    AVAHI_LLIST_REMOVE(AvahiSAddressResolver, resolver, r->server->address_resolvers, r);
+
+    if (r->record_browser)
+        avahi_s_record_browser_free(r->record_browser);
+
+    if (r->time_event)
+        avahi_time_event_free(r->time_event);
+
+    if (r->ptr_record)
+        avahi_record_unref(r->ptr_record);
+
+    if (r->key)
+        avahi_key_unref(r->key);
+    
+    avahi_free(r);
+}