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, 237 insertions, 0 deletions

diff --git a/trunk/avahi-core/browse-domain.c b/trunk/avahi-core/browse-domain.c
new file mode 100644
index 0000000..0043806
--- /dev/null
+++ b/trunk/avahi-core/browse-domain.c
@@ -0,0 +1,237 @@
+/* $Id$ */
+
+/***
+  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/domain.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/error.h>
+
+#include "browse.h"
+#include "log.h"
+
+struct AvahiSDomainBrowser {
+    int ref;
+    
+    AvahiServer *server;
+    
+    AvahiSRecordBrowser *record_browser;
+
+    AvahiDomainBrowserType type;
+    AvahiSDomainBrowserCallback callback;
+    void* userdata;
+
+    AvahiTimeEvent *defer_event;
+
+    int all_for_now_scheduled;
+    
+    AVAHI_LLIST_FIELDS(AvahiSDomainBrowser, browser);
+};
+
+static void inc_ref(AvahiSDomainBrowser *b) {
+    assert(b);
+    assert(b->ref >= 1);
+
+    b->ref++;
+}
+
+static void record_browser_callback(
+    AvahiSRecordBrowser*rr,
+    AvahiIfIndex interface,
+    AvahiProtocol protocol,
+    AvahiBrowserEvent event,
+    AvahiRecord *record,
+    AvahiLookupResultFlags flags,
+    void* userdata) {
+    
+    AvahiSDomainBrowser *b = userdata;
+    char *n = NULL;
+
+    assert(rr);
+    assert(b);
+
+    if (event == AVAHI_BROWSER_ALL_FOR_NOW &&
+        b->defer_event) {
+
+        b->all_for_now_scheduled = 1;
+        return;
+    }
+    
+    /* Filter flags */
+    flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA;
+
+    if (record) {
+        assert(record->key->type == AVAHI_DNS_TYPE_PTR);
+        n = record->data.ptr.name;
+
+        if (b->type == AVAHI_DOMAIN_BROWSER_BROWSE) {
+            AvahiStringList *l;
+
+            /* Filter out entries defined statically */
+            
+            for (l = b->server->config.browse_domains; l; l = l->next)
+                if (avahi_domain_equal((char*) l->text, n))
+                    return;
+        }
+        
+    }
+        
+    b->callback(b, interface, protocol, event, n, flags, b->userdata);
+}
+
+static void defer_callback(AvahiTimeEvent *e, void *userdata) {
+    AvahiSDomainBrowser *b = userdata;
+    AvahiStringList *l;
+    
+    assert(e);
+    assert(b);
+
+    assert(b->type == AVAHI_DOMAIN_BROWSER_BROWSE);
+
+    avahi_time_event_free(b->defer_event);
+    b->defer_event = NULL;
+
+    /* Increase ref counter */
+    inc_ref(b);
+
+    for (l = b->server->config.browse_domains; l; l = l->next) {
+        
+        /* Check whether this object still exists outside our own
+         * stack frame */
+        if (b->ref <= 1)
+            break;
+        
+        b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_BROWSER_NEW, (char*) l->text, AVAHI_LOOKUP_RESULT_STATIC, b->userdata);
+    }
+
+    if (b->ref > 1) {
+        /* If the ALL_FOR_NOW event has already been scheduled, execute it now */
+        
+        if (b->all_for_now_scheduled) 
+            b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_BROWSER_ALL_FOR_NOW, NULL, 0, b->userdata);
+    }
+    
+    /* Decrease ref counter */
+    avahi_s_domain_browser_free(b);
+}
+
+AvahiSDomainBrowser *avahi_s_domain_browser_new(
+    AvahiServer *server,
+    AvahiIfIndex interface,
+    AvahiProtocol protocol,
+    const char *domain,
+    AvahiDomainBrowserType type,
+    AvahiLookupFlags flags,
+    AvahiSDomainBrowserCallback callback,
+    void* userdata) {
+
+    static const char * const type_table[AVAHI_DOMAIN_BROWSER_MAX] = {
+        "b",
+        "db",
+        "r",
+        "dr",
+        "lb"
+    };
+    
+    AvahiSDomainBrowser *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, type < AVAHI_DOMAIN_BROWSER_MAX, AVAHI_ERR_INVALID_FLAGS);
+    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);
+
+    if (!domain)
+        domain = server->domain_name;
+
+    if ((r = avahi_service_name_join(n, sizeof(n), type_table[type], "_dns-sd._udp", domain)) < 0) {
+        avahi_server_set_errno(server, r);
+        return NULL;
+    }
+    
+    if (!(b = avahi_new(AvahiSDomainBrowser, 1))) {
+        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+        return NULL;
+    }
+
+    b->ref = 1;
+    b->server = server;
+    b->callback = callback;
+    b->userdata = userdata;
+    b->record_browser = NULL;
+    b->type = type;
+    b->all_for_now_scheduled = 0;
+    b->defer_event = NULL;
+
+    AVAHI_LLIST_PREPEND(AvahiSDomainBrowser, browser, server->domain_browsers, b);
+
+    if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) {
+        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);
+
+    if (type == AVAHI_DOMAIN_BROWSER_BROWSE && b->server->config.browse_domains)
+        b->defer_event = avahi_time_event_new(server->time_event_queue, NULL, defer_callback, b);
+    
+    return b;
+    
+fail:
+    
+    if (k)
+        avahi_key_unref(k);
+    
+    avahi_s_domain_browser_free(b);
+    
+    return NULL;
+}
+
+void avahi_s_domain_browser_free(AvahiSDomainBrowser *b) {
+    assert(b);
+
+    assert(b->ref >= 1);
+    if (--b->ref > 0)
+        return;
+    
+    AVAHI_LLIST_REMOVE(AvahiSDomainBrowser, browser, b->server->domain_browsers, b);
+
+    if (b->record_browser)
+        avahi_s_record_browser_free(b->record_browser);
+
+    if (b->defer_event)
+        avahi_time_event_free(b->defer_event);
+    
+    avahi_free(b);
+}