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, 324 insertions, 0 deletions

diff --git a/trunk/avahi-core/browse-dns-server.c b/trunk/avahi-core/browse-dns-server.c
new file mode 100644
index 0000000..48d23ad
--- /dev/null
+++ b/trunk/avahi-core/browse-dns-server.c
@@ -0,0 +1,324 @@
+/* $Id$ */
+
+/***
+  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 <avahi-common/domain.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/error.h>
+
+#include "browse.h"
+#include "log.h"
+#include "rr.h"
+
+typedef struct AvahiDNSServerInfo AvahiDNSServerInfo;
+
+struct AvahiDNSServerInfo {
+    AvahiSDNSServerBrowser *browser;
+
+    AvahiIfIndex interface;
+    AvahiProtocol protocol;
+    AvahiRecord *srv_record;
+    AvahiSHostNameResolver *host_name_resolver;
+    AvahiAddress address;
+    AvahiLookupResultFlags flags;
+    
+    AVAHI_LLIST_FIELDS(AvahiDNSServerInfo, info);
+};
+
+struct AvahiSDNSServerBrowser {
+    AvahiServer *server;
+    
+    AvahiSRecordBrowser *record_browser;
+    AvahiSDNSServerBrowserCallback callback;
+    void* userdata;
+    AvahiProtocol aprotocol;
+    AvahiLookupFlags user_flags;
+
+    unsigned n_info;
+    
+    AVAHI_LLIST_FIELDS(AvahiSDNSServerBrowser, browser);
+    AVAHI_LLIST_HEAD(AvahiDNSServerInfo, info);
+};
+
+static AvahiDNSServerInfo* get_server_info(AvahiSDNSServerBrowser *b, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *r) {
+    AvahiDNSServerInfo *i;
+    
+    assert(b);
+    assert(r);
+
+    for (i = b->info; i; i = i->info_next)
+        if (i->interface == interface &&
+            i->protocol == protocol &&
+            avahi_record_equal_no_ttl(r, i->srv_record))
+            return i;
+
+    return NULL;
+}
+
+static void server_info_free(AvahiSDNSServerBrowser *b, AvahiDNSServerInfo *i) {
+    assert(b);
+    assert(i);
+
+    avahi_record_unref(i->srv_record);
+    if (i->host_name_resolver)
+        avahi_s_host_name_resolver_free(i->host_name_resolver);
+    
+    AVAHI_LLIST_REMOVE(AvahiDNSServerInfo, info, b->info, i);
+
+    assert(b->n_info >= 1);
+    b->n_info--;
+    
+    avahi_free(i);
+}
+
+static void host_name_resolver_callback(
+    AvahiSHostNameResolver *r,
+    AVAHI_GCC_UNUSED AvahiIfIndex interface,
+    AVAHI_GCC_UNUSED AvahiProtocol protocol,
+    AvahiResolverEvent event,
+    const char *host_name,
+    const AvahiAddress *a,
+    AvahiLookupResultFlags flags,
+    void* userdata) {
+    
+    AvahiDNSServerInfo *i = userdata;
+    
+    assert(r);
+    assert(host_name);
+    assert(i);
+
+    switch (event) {
+        case AVAHI_RESOLVER_FOUND: {
+            i->address = *a;
+            
+            i->browser->callback(
+                i->browser,
+                i->interface,
+                i->protocol,
+                AVAHI_BROWSER_NEW,
+                i->srv_record->data.srv.name,
+                &i->address,
+                i->srv_record->data.srv.port,
+                i->flags | flags,
+                i->browser->userdata);
+
+            break;
+        }
+
+        case AVAHI_RESOLVER_FAILURE:
+            /* Ignore */
+            break;
+    }
+
+    avahi_s_host_name_resolver_free(i->host_name_resolver);
+    i->host_name_resolver = NULL;
+}
+
+static void record_browser_callback(
+    AvahiSRecordBrowser*rr,
+    AvahiIfIndex interface,
+    AvahiProtocol protocol,
+    AvahiBrowserEvent event,
+    AvahiRecord *record,
+    AvahiLookupResultFlags flags,
+    void* userdata) {
+    
+    AvahiSDNSServerBrowser *b = userdata;
+
+    assert(rr);
+    assert(b);
+
+    /* Filter flags */
+    flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA;
+
+    switch (event) {
+        case AVAHI_BROWSER_NEW: {
+            AvahiDNSServerInfo *i;
+            
+            assert(record);
+            assert(record->key->type == AVAHI_DNS_TYPE_SRV);
+
+            if (get_server_info(b, interface, protocol, record))
+                return;
+            
+            if (b->n_info >= 10)
+                return;
+            
+            if (!(i = avahi_new(AvahiDNSServerInfo, 1)))
+                return; /* OOM */
+            
+            i->browser = b;
+            i->interface = interface;
+            i->protocol = protocol;
+            i->srv_record = avahi_record_ref(record);
+            i->host_name_resolver = avahi_s_host_name_resolver_new(
+                b->server,
+                interface, protocol,
+                record->data.srv.name,
+                b->aprotocol,
+                b->user_flags,
+                host_name_resolver_callback, i);
+            i->flags = flags;
+            
+            AVAHI_LLIST_PREPEND(AvahiDNSServerInfo, info, b->info, i);
+            
+            b->n_info++;
+            break;
+        }
+
+        case AVAHI_BROWSER_REMOVE: {
+            AvahiDNSServerInfo *i;
+            
+            assert(record);
+            assert(record->key->type == AVAHI_DNS_TYPE_SRV);
+
+            if (!(i = get_server_info(b, interface, protocol, record)))
+                return;
+            
+            if (!i->host_name_resolver)
+                b->callback(
+                    b,
+                    interface,
+                    protocol,
+                    event,
+                    i->srv_record->data.srv.name,
+                    &i->address,
+                    i->srv_record->data.srv.port,
+                    i->flags | flags,
+                    b->userdata);
+            
+            server_info_free(b, i);
+            break;
+        }
+
+        case AVAHI_BROWSER_FAILURE:
+        case AVAHI_BROWSER_ALL_FOR_NOW:
+        case AVAHI_BROWSER_CACHE_EXHAUSTED:
+
+            b->callback(
+                b,
+                interface,
+                protocol,
+                event,
+                NULL,
+                NULL,
+                0,
+                flags,
+                b->userdata);
+            
+            break;
+    }
+}
+
+AvahiSDNSServerBrowser *avahi_s_dns_server_browser_new(
+    AvahiServer *server,
+    AvahiIfIndex interface,
+    AvahiProtocol protocol,
+    const char *domain,
+    AvahiDNSServerType type,
+    AvahiProtocol aprotocol,
+    AvahiLookupFlags flags,
+    AvahiSDNSServerBrowserCallback callback,
+    void* userdata) {
+
+    static const char * const type_table[AVAHI_DNS_SERVER_MAX] = {
+        "_domain._udp",
+        "_dns-update._udp"
+    };
+    
+    AvahiSDNSServerBrowser *b;
+    AvahiKey *k = NULL;
+    char n[AVAHI_DOMAIN_NAME_MAX];
+    int r;
+    
+    assert(server);
+    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, AVAHI_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL);
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
+    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, type < AVAHI_DNS_SERVER_MAX, AVAHI_ERR_INVALID_FLAGS);
+
+    if (!domain)
+        domain = server->domain_name;
+
+    if ((r = avahi_service_name_join(n, sizeof(n), NULL, type_table[type], domain)) < 0) {
+        avahi_server_set_errno(server, r);
+        return NULL;
+    }
+    
+    if (!(b = avahi_new(AvahiSDNSServerBrowser, 1))) {
+        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+        return NULL;
+    }
+    
+    b->server = server;
+    b->callback = callback;
+    b->userdata = userdata;
+    b->aprotocol = aprotocol;
+    b->n_info = 0;
+    b->user_flags = flags;
+
+    AVAHI_LLIST_HEAD_INIT(AvahiDNSServerInfo, b->info);
+    AVAHI_LLIST_PREPEND(AvahiSDNSServerBrowser, browser, server->dns_server_browsers, b);
+    
+    if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV))) {
+        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+        goto fail;
+    }
+    
+    if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b)))
+        goto fail;
+        
+    avahi_key_unref(k);
+
+    return b;
+
+fail:
+
+    if (k)
+        avahi_key_unref(k);
+    
+    avahi_s_dns_server_browser_free(b);
+    return NULL;
+}
+
+void avahi_s_dns_server_browser_free(AvahiSDNSServerBrowser *b) {
+    assert(b);
+
+    while (b->info)
+        server_info_free(b, b->info);
+    
+    AVAHI_LLIST_REMOVE(AvahiSDNSServerBrowser, browser, b->server->dns_server_browsers, b);
+
+    if (b->record_browser)
+        avahi_s_record_browser_free(b->record_browser);
+
+    avahi_free(b);
+}
+