chat_sync: invite — process IPv6 addresses from invite link

cm_invite_trampoline() previously skipped all IPv6 addresses from
invite links (if (family != 4) continue). Now:
- DB save: save IPv6 addresses to node_addresses with family=6
- TOPO_NODE: create TOPO_ADDR6 entries, populate ni->v6_addrs
- ncd_create_links already handles IPv6 sockets correctly
- Condition check includes v6_addrs alongside v4_addrs
- Cleanup frees v6_addrs chain

src/chat/chat_sync.c

@@ -629,12 +629,19 @@ static void cm_invite_trampoline(void* arg) {
         for (int i = 0; i < inv->addr_count; i++) {
             uint8_t family = *ap++; ap++;  /* skip sock_id */
             uint8_t proto = *ap++;         /* read proto */
-            if (family != 4) { ap += 18; continue; }
+            if (family == 4) {
                 sqlite3_bind_int64(st, 1, (sqlite3_int64)node_id); sqlite3_bind_int(st, 2, 4); sqlite3_bind_int(st, 3, proto);
                 sqlite3_bind_blob(st, 4, ap, 4, SQLITE_STATIC); ap += 4;
                 uint16_t port = ((uint16_t)ap[0] << 8) | ap[1]; ap += 2;
-            sqlite3_bind_int(st, 5, (int)port); sqlite3_bind_int(st, 6, 1); /* addr_type=1 (DIRECT) */
+                sqlite3_bind_int(st, 5, (int)port); sqlite3_bind_int(st, 6, 1);
                 sqlite3_step(st); sqlite3_reset(st);
+            } else if (family == 6) {
+                sqlite3_bind_int64(st, 1, (sqlite3_int64)node_id); sqlite3_bind_int(st, 2, 6); sqlite3_bind_int(st, 3, proto);
+                sqlite3_bind_blob(st, 4, ap, 16, SQLITE_STATIC); ap += 16;
+                uint16_t port = ((uint16_t)ap[0] << 8) | ap[1]; ap += 2;
+                sqlite3_bind_int(st, 5, (int)port); sqlite3_bind_int(st, 6, 1);
+                sqlite3_step(st); sqlite3_reset(st);
+            } else { ap += 18; }
         }
         sqlite3_finalize(st);
     }
@@ -656,16 +663,24 @@ static void cm_invite_trampoline(void* arg) {
     for (int i = 0; i < inv->addr_count; i++) {
         uint8_t family = *ap++; uint8_t sock_id = *ap++; uint8_t proto = *ap++;
         uint16_t port = 0;
-        if (family == 4) { const uint8_t* a = ap; port = ((uint16_t)ap[4] << 8) | ap[5]; }
-        DEBUG_DEBUG(DEBUG_CATEGORY_DB_SYNC, "%s: invite addr[%d] family=%d proto=%d sock=%d %d.%d.%d.%d:%d",
-                    CS_ID, i, family, proto, sock_id, ap[0], ap[1], ap[2], ap[3], port);
-        if (family != 4) { ap += 18; continue; }
+        if (family == 4) { port = ((uint16_t)ap[4] << 8) | ap[5]; }
+        DEBUG_DEBUG(DEBUG_CATEGORY_DB_SYNC, "%s: invite addr[%d] family=%d proto=%d sock=%d port=%d",
+                    CS_ID, i, family, proto, sock_id, port);
+        if (family == 4) {
             struct TOPO_ADDR4* a4 = u_calloc(1, sizeof(*a4));
             if (!a4) break;
             memcpy(a4->addr, ap, 4); ap += 4;
             a4->port = ((uint16_t)ap[0] << 8) | ap[1]; ap += 2;
             a4->type = TOPO_ADDR_NAT; a4->protocol = proto;
             a4->next = ni->v4_addrs; ni->v4_addrs = a4;
+        } else if (family == 6) {
+            struct TOPO_ADDR6* a6 = u_calloc(1, sizeof(*a6));
+            if (!a6) break;
+            memcpy(a6->addr, ap, 16); ap += 16;
+            a6->port = ((uint16_t)ap[0] << 8) | ap[1]; ap += 2;
+            a6->type = TOPO_ADDR_NAT; a6->protocol = proto;
+            a6->next = ni->v6_addrs; ni->v6_addrs = a6;
+        } else { ap += 18; }
     }
 
     struct ETCP_CONN* existing = instance_find_conn(inst, node_id);
@@ -685,19 +700,20 @@ static void cm_invite_trampoline(void* arg) {
         } else {
             DEBUG_INFO(DEBUG_CATEGORY_DB_SYNC, "%s: invite conn in progress node=0x%016llx, waiting UP", CS_ID, (unsigned long long)node_id);
         }
-    } else if (inst->topo_groups && ni->v4_addrs) {
+    } else if (inst->topo_groups && (ni->v4_addrs || ni->v6_addrs)) {
         struct TOPO_GROUP* g = topo_groups_find(inst->topo_groups, channel_id);
         if (g && g->conn_mgr) {
             conn_mgr_open_invite(inst, channel_id, ni, node_id, NULL, NULL, NULL);
             DEBUG_INFO(DEBUG_CATEGORY_DB_SYNC, "%s: invite connect posted node=0x%016llx", CS_ID, (unsigned long long)node_id);
         }
     } else {
-        DEBUG_ERROR(DEBUG_CATEGORY_DB_SYNC, "%s: invite no addrs topo=%p v4=%p", CS_ID,
-                    (void*)inst->topo_groups, (void*)ni->v4_addrs);
+        DEBUG_ERROR(DEBUG_CATEGORY_DB_SYNC, "%s: invite no addrs topo=%p v4=%p v6=%p", CS_ID,
+                    (void*)inst->topo_groups, (void*)ni->v4_addrs, (void*)ni->v6_addrs);
     }
 
     /* free caller-owned ni */
     while (ni->v4_addrs) { struct TOPO_ADDR4* n = ni->v4_addrs->next; u_free(ni->v4_addrs); ni->v4_addrs = n; }
+    while (ni->v6_addrs) { struct TOPO_ADDR6* n = ni->v6_addrs->next; u_free(ni->v6_addrs); ni->v6_addrs = n; }
     u_free(ni);
     u_free(w);
 }