1 files changed, 422 insertions, 0 deletions

diff --git a/avahi-core/announce.c b/avahi-core/announce.c
new file mode 100644
index 0000000..dbad6c7
--- /dev/null
+++ b/avahi-core/announce.c
@@ -0,0 +1,422 @@
+/* $Id$ */
+
+/***
+  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 "announce.h"
+#include "util.h"
+
+#define AVAHI_ANNOUNCEMENT_JITTER_MSEC 250
+#define AVAHI_PROBE_JITTER_MSEC 250
+#define AVAHI_PROBE_INTERVAL_MSEC 250
+
+static void remove_announcement(AvahiServer *s, AvahiAnnouncement *a) {
+    g_assert(s);
+    g_assert(a);
+
+    if (a->time_event)
+        avahi_time_event_queue_remove(s->time_event_queue, a->time_event);
+
+    AVAHI_LLIST_REMOVE(AvahiAnnouncement, by_interface, a->interface->announcements, a);
+    AVAHI_LLIST_REMOVE(AvahiAnnouncement, by_entry, a->entry->announcements, a);
+    
+    g_free(a);
+}
+
+static void elapse_announce(AvahiTimeEvent *e, void *userdata);
+
+static void set_timeout(AvahiAnnouncement *a, const GTimeVal *tv) {
+    g_assert(a);
+
+    if (!tv) {
+        if (a->time_event) {
+            avahi_time_event_queue_remove(a->server->time_event_queue, a->time_event);
+            a->time_event = NULL;
+        }
+    } else {
+
+        if (a->time_event) 
+            avahi_time_event_queue_update(a->server->time_event_queue, a->time_event, tv);
+        else
+            a->time_event = avahi_time_event_queue_add(a->server->time_event_queue, tv, elapse_announce, a);
+    }
+}
+
+static void next_state(AvahiAnnouncement *a);
+
+void avahi_entry_group_check_probed(AvahiEntryGroup *g, gboolean immediately) {
+    AvahiEntry *e;
+    g_assert(g);
+    g_assert(!g->dead);
+
+    /* Check whether all group members have been probed */
+    
+    if (g->state != AVAHI_ENTRY_GROUP_REGISTERING || g->n_probing > 0) 
+        return;
+
+    avahi_entry_group_change_state(g, AVAHI_ENTRY_GROUP_ESTABLISHED);
+
+    if (g->dead)
+        return;
+    
+    for (e = g->entries; e; e = e->entries_next) {
+        AvahiAnnouncement *a;
+        
+        for (a = e->announcements; a; a = a->by_entry_next) {
+
+            if (a->state != AVAHI_WAITING)
+                continue;
+            
+            a->state = AVAHI_ANNOUNCING;
+
+            if (immediately) {
+                /* Shortcut */
+                
+                a->n_iteration = 1;
+                next_state(a);
+            } else {
+                GTimeVal tv;
+                a->n_iteration = 0;
+                avahi_elapse_time(&tv, 0, AVAHI_ANNOUNCEMENT_JITTER_MSEC);
+                set_timeout(a, &tv);
+            }
+        }
+    }
+}
+
+static void next_state(AvahiAnnouncement *a) {
+    g_assert(a);
+
+/*     g_message("%i -- %u", a->state, a->n_iteration);   */
+    
+    if (a->state == AVAHI_WAITING) {
+
+        g_assert(a->entry->group);
+
+        avahi_entry_group_check_probed(a->entry->group, TRUE);
+        
+    } else if (a->state == AVAHI_PROBING) {
+
+        if (a->n_iteration >= 4) {
+            /* Probing done */
+            
+            gchar *t;
+
+            g_message("Enough probes for record [%s]", t = avahi_record_to_string(a->entry->record));
+            g_free(t);
+
+            if (a->entry->group) {
+                g_assert(a->entry->group->n_probing);
+                a->entry->group->n_probing--;
+            }
+            
+            if (a->entry->group && a->entry->group->state == AVAHI_ENTRY_GROUP_REGISTERING)
+                a->state = AVAHI_WAITING;
+            else {
+                a->state = AVAHI_ANNOUNCING;
+                a->n_iteration = 1;
+            }
+
+            set_timeout(a, NULL);
+            next_state(a);
+        } else {
+            GTimeVal tv;
+
+            avahi_interface_post_probe(a->interface, a->entry->record, FALSE);
+            
+            avahi_elapse_time(&tv, AVAHI_PROBE_INTERVAL_MSEC, 0);
+            set_timeout(a, &tv);
+            
+            a->n_iteration++;
+        }
+
+    } else if (a->state == AVAHI_ANNOUNCING) {
+
+        avahi_interface_post_response(a->interface, NULL, a->entry->record, a->entry->flags & AVAHI_ENTRY_UNIQUE, FALSE);
+
+        if (++a->n_iteration >= 4) {
+            gchar *t;
+            /* Announcing done */
+
+            g_message("Enough announcements for record [%s]", t = avahi_record_to_string(a->entry->record));
+            g_free(t);
+
+            a->state = AVAHI_ESTABLISHED;
+
+            set_timeout(a, NULL);
+        } else {
+            GTimeVal tv;
+            avahi_elapse_time(&tv, a->sec_delay*1000, AVAHI_ANNOUNCEMENT_JITTER_MSEC);
+        
+            if (a->n_iteration < 10)
+                a->sec_delay *= 2;
+            
+            set_timeout(a, &tv);
+        }
+    }
+}
+
+static void elapse_announce(AvahiTimeEvent *e, void *userdata) {
+    g_assert(e);
+
+    next_state(userdata);
+}
+
+AvahiAnnouncement *avahi_get_announcement(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
+    AvahiAnnouncement *a;
+    
+    g_assert(s);
+    g_assert(e);
+    g_assert(i);
+
+    for (a = e->announcements; a; a = a->by_entry_next)
+        if (a->interface == i)
+            return a;
+
+    return NULL;
+}
+
+static void new_announcement(AvahiServer *s, AvahiInterface *i, AvahiEntry *e) {
+    AvahiAnnouncement *a;
+    GTimeVal tv;
+    gchar *t; 
+
+    g_assert(s);
+    g_assert(i);
+    g_assert(e);
+    g_assert(!e->dead);
+
+/*     g_message("NEW ANNOUNCEMENT: %s.%i [%s]", i->hardware->name, i->protocol, t = avahi_record_to_string(e->record)); */
+/*     g_free(t); */
+    
+    if (!avahi_interface_match(i, e->interface, e->protocol) || !i->announcing || !avahi_entry_commited(e))
+        return;
+
+    /* We don't want duplicate announcements */
+    if (avahi_get_announcement(s, e, i))
+        return;
+
+    a = g_new(AvahiAnnouncement, 1);
+    a->server = s;
+    a->interface = i;
+    a->entry = e;
+
+    if ((e->flags & AVAHI_ENTRY_UNIQUE) && !(e->flags & AVAHI_ENTRY_NOPROBE))
+        a->state = AVAHI_PROBING;
+    else if (!(e->flags & AVAHI_ENTRY_NOANNOUNCE)) {
+
+        if (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED)
+            a->state = AVAHI_ANNOUNCING;
+        else
+            a->state = AVAHI_WAITING;
+        
+    } else
+        a->state = AVAHI_ESTABLISHED;
+
+
+    g_message("New announcement on interface %s.%i for entry [%s] state=%i", i->hardware->name, i->protocol, t = avahi_record_to_string(e->record), a->state);
+    g_free(t);
+
+    a->n_iteration = 1;
+    a->sec_delay = 1;
+    a->time_event = NULL;
+
+    if (a->state == AVAHI_PROBING)
+        if (e->group)
+            e->group->n_probing++;
+    
+    AVAHI_LLIST_PREPEND(AvahiAnnouncement, by_interface, i->announcements, a);
+    AVAHI_LLIST_PREPEND(AvahiAnnouncement, by_entry, e->announcements, a);
+
+    if (a->state == AVAHI_PROBING) {
+        avahi_elapse_time(&tv, 0, AVAHI_PROBE_JITTER_MSEC);
+        set_timeout(a, &tv);
+    } else if (a->state == AVAHI_ANNOUNCING) {
+        avahi_elapse_time(&tv, 0, AVAHI_ANNOUNCEMENT_JITTER_MSEC);
+        set_timeout(a, &tv);
+    }
+}
+
+void avahi_announce_interface(AvahiServer *s, AvahiInterface *i) {
+    AvahiEntry *e;
+    
+    g_assert(s);
+    g_assert(i);
+
+    if (!i->announcing)
+        return;
+
+    for (e = s->entries; e; e = e->entries_next)
+        if (!e->dead)
+            new_announcement(s, i, e);
+}
+
+static void announce_walk_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
+    AvahiEntry *e = userdata;
+    
+    g_assert(m);
+    g_assert(i);
+    g_assert(e);
+    g_assert(!e->dead);
+
+    new_announcement(m->server, i, e);
+}
+
+void avahi_announce_entry(AvahiServer *s, AvahiEntry *e) {
+    g_assert(s);
+    g_assert(e);
+    g_assert(!e->dead);
+
+    avahi_interface_monitor_walk(s->monitor, e->interface, e->protocol, announce_walk_callback, e);
+}
+
+void avahi_announce_group(AvahiServer *s, AvahiEntryGroup *g) {
+    AvahiEntry *e;
+    
+    g_assert(s);
+    g_assert(g);
+
+    for (e = g->entries; e; e = e->by_group_next)
+        if (!e->dead)
+            avahi_announce_entry(s, e);
+}
+
+gboolean avahi_entry_registered(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
+    AvahiAnnouncement *a;
+
+    g_assert(s);
+    g_assert(e);
+    g_assert(i);
+    g_assert(!e->dead);
+
+    if (!(a = avahi_get_announcement(s, e, i)))
+        return FALSE;
+    
+    return a->state == AVAHI_ANNOUNCING || a->state == AVAHI_ESTABLISHED;
+}
+
+gboolean avahi_entry_registering(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
+    AvahiAnnouncement *a;
+
+    g_assert(s);
+    g_assert(e);
+    g_assert(i);
+    g_assert(!e->dead);
+
+    if (!(a = avahi_get_announcement(s, e, i)))
+        return FALSE;
+    
+    return a->state == AVAHI_PROBING || a->state == AVAHI_WAITING;
+}
+
+static AvahiRecord *make_goodbye_record(AvahiRecord *r) {
+/*     gchar *t; */
+    AvahiRecord *g;
+    
+    g_assert(r);
+
+/*     g_message("Preparing goodbye for record [%s]", t = avahi_record_to_string(r)); */
+/*     g_free(t); */
+
+    g = avahi_record_copy(r);
+    g_assert(g->ref == 1);
+    g->ttl = 0;
+
+    return g;
+}
+
+static void send_goodbye_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
+    AvahiEntry *e = userdata;
+    AvahiRecord *g;
+    
+    g_assert(m);
+    g_assert(i);
+    g_assert(e);
+    g_assert(!e->dead);
+
+    if (!avahi_interface_match(i, e->interface, e->protocol))
+        return;
+
+    if (e->flags & AVAHI_ENTRY_NOANNOUNCE)
+        return;
+
+    if (!avahi_entry_registered(m->server, e, i))
+        return;
+    
+    g = make_goodbye_record(e->record);
+    avahi_interface_post_response(i, NULL, g, e->flags & AVAHI_ENTRY_UNIQUE, TRUE);
+    avahi_record_unref(g);
+}
+    
+void avahi_goodbye_interface(AvahiServer *s, AvahiInterface *i, gboolean goodbye) {
+    g_assert(s);
+    g_assert(i);
+
+/*     g_message("goodbye interface: %s.%u", i->hardware->name, i->protocol); */
+
+    if (goodbye && avahi_interface_relevant(i)) {
+        AvahiEntry *e;
+        
+        for (e = s->entries; e; e = e->entries_next)
+            if (!e->dead)
+                send_goodbye_callback(s->monitor, i, e);
+    }
+
+    while (i->announcements)
+        remove_announcement(s, i->announcements);
+
+/*     g_message("goodbye interface done: %s.%u", i->hardware->name, i->protocol); */
+
+}
+
+void avahi_goodbye_entry(AvahiServer *s, AvahiEntry *e, gboolean goodbye) {
+    g_assert(s);
+    g_assert(e);
+    
+/*     g_message("goodbye entry: %p", e); */
+    
+    if (goodbye && !e->dead)
+        avahi_interface_monitor_walk(s->monitor, 0, AF_UNSPEC, send_goodbye_callback, e);
+
+    while (e->announcements)
+        remove_announcement(s, e->announcements);
+
+/*     g_message("goodbye entry done: %p", e); */
+
+}
+
+void avahi_goodbye_all(AvahiServer *s, gboolean goodbye) {
+    AvahiEntry *e;
+    
+    g_assert(s);
+
+/*     g_message("goodbye all"); */
+
+    for (e = s->entries; e; e = e->entries_next)
+        if (!e->dead)
+            avahi_goodbye_entry(s, e, goodbye);
+
+/*     g_message("goodbye all done"); */
+
+}
+