X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=52300632ad2286b923b60a7fa0d417d4e9d84c3a;hp=97b51b4321b4196d6a50a62b7bcddc7d8ae642d1;hb=4dee76522e177dcb4af5d6d844a5f3b74070e4b7;hpb=d2a54597e029f9d4f7bd29837be1be33909d78b1

diff --git a/src/protocol.c b/src/protocol.c
index 97b51b43..52300632 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: protocol.c,v 1.28.4.84 2001/03/02 11:25:56 guus Exp $
+    $Id: protocol.c,v 1.28.4.90 2001/05/25 08:36:11 guus Exp $
 */
 
 #include "config.h"
@@ -68,6 +68,8 @@
 
 #include "system.h"
 
+int mykeyused = 0;
+
 int check_id(char *id)
 {
   int i;
@@ -119,7 +121,7 @@ int receive_request(connection_t *cl)
 cp  
   if(sscanf(cl->buffer, "%d", &request) == 1)
     {
-      if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
+      if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
         {
           syslog(LOG_ERR, _("Unknown request from %s (%s)"),
 		 cl->name, cl->hostname);
@@ -325,6 +327,7 @@ cp
       subnet = (subnet_t *)node->data;
       send_add_subnet(cl, subnet);
     }
+
   /* And send him all the hosts and their subnets we know... */
   
   for(node = connection_tree->head; node; node = node->next)
@@ -644,7 +647,7 @@ int send_add_subnet(connection_t *cl, subnet_t *subnet)
   char *netstr;
   char *owner;
 cp
-  if(cl->options & OPTION_INDIRECT)
+  if((cl->options | myself->options | subnet->owner->options) & OPTION_INDIRECT)
     owner = myself->name;
   else
     owner = subnet->owner->name;
@@ -810,7 +813,7 @@ cp
 int send_add_host(connection_t *cl, connection_t *other)
 {
 cp
-  if(!(cl->options & OPTION_INDIRECT))
+  if(!((cl->options | myself->options | other->options) & OPTION_INDIRECT))
     return send_request(cl, "%d %s %lx:%d %lx", ADD_HOST,
                       other->name, other->address, other->port, other->options);
   else
@@ -904,7 +907,7 @@ cp
 int send_del_host(connection_t *cl, connection_t *other)
 {
 cp
-  if(!(cl->options & OPTION_INDIRECT))
+  if(!((cl->options | myself->options) & OPTION_INDIRECT))
     return send_request(cl, "%d %s %lx:%d %lx", DEL_HOST,
                       other->name, other->address, other->port, other->options);
   else
@@ -914,7 +917,7 @@ cp
 int del_host_h(connection_t *cl)
 {
   char name[MAX_STRING_SIZE];
-  ip_t address;
+  ipv4_t address;
   port_t port;
   long int options;
   connection_t *old, *p;
@@ -1059,11 +1062,15 @@ cp
 
 int send_ping(connection_t *cl)
 {
+  char salt[SALTLEN*2+1];
 cp
   cl->status.pinged = 1;
   cl->last_ping_time = time(NULL);
+  RAND_bytes(salt, SALTLEN);
+  bin2hex(salt, salt, SALTLEN);
+  salt[SALTLEN*2] = '\0';
 cp
-  return send_request(cl, "%d", PING);
+  return send_request(cl, "%d %s", PING, salt);
 }
 
 int ping_h(connection_t *cl)
@@ -1074,8 +1081,13 @@ cp
 
 int send_pong(connection_t *cl)
 {
+  char salt[SALTLEN*2+1];
 cp
-  return send_request(cl, "%d", PONG);
+  RAND_bytes(salt, SALTLEN);
+  bin2hex(salt, salt, SALTLEN);
+  salt[SALTLEN*2] = '\0';
+cp
+  return send_request(cl, "%d %s", PONG, salt);
 }
 
 int pong_h(connection_t *cl)
@@ -1093,13 +1105,21 @@ int send_key_changed(connection_t *from, connection_t *cl)
   connection_t *p;
   avl_node_t *node;
 cp
-  for(node = connection_tree->head; node; node = node->next)
+  /* Only send this message if some other daemon requested our key previously.
+     This reduces unnecessary key_changed broadcasts.
+  */
+
+  if(mykeyused)
     {
-      p = (connection_t *)node->data;
-      if(p != cl && p->status.meta && p->status.active)
-        if(!(p->options & OPTION_INDIRECT) || from == myself)
-          send_request(p, "%d %s", KEY_CHANGED, from->name);
-    }
+      for(node = connection_tree->head; node; node = node->next)
+        {
+          p = (connection_t *)node->data;
+          if(p != cl && p->status.meta && p->status.active)
+            if(!(p->options & OPTION_INDIRECT) || from == myself)
+              send_request(p, "%d %s", KEY_CHANGED, from->name);
+        }
+    mykeyused = 0;
+  }
 cp
   return 0;
 }
@@ -1126,7 +1146,8 @@ cp
   from->status.validkey = 0;
   from->status.waitingforkey = 0;
 
-  send_key_changed(from, cl);
+  if(!(from->options | cl->options | myself->options) & OPTION_INDIRECT)
+    send_key_changed(from, cl);
 cp
   return 0;
 }
@@ -1161,11 +1182,12 @@ cp
 
   /* Check if this key request is for us */
 
-  if(!strcmp(to_id, myself->name))
+  if(!strcmp(to_id, myself->name))	/* Yes, send our own key back */
     {
       bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength);
       pktkey[myself->cipher_pktkeylength*2] = '\0';
       send_ans_key(myself, from, pktkey);
+      mykeyused = 1;
     }
   else
     {
@@ -1264,7 +1286,7 @@ cp
 int send_tcppacket(connection_t *cl, vpn_packet_t *packet)
 {
   int x;
-  
+cp  
   x = send_request(cl->nexthop, "%d %hd", PACKET, packet->len);
 
   if(x)
@@ -1278,8 +1300,8 @@ int tcppacket_h(connection_t *cl)
   vpn_packet_t packet;
   char *p;
   int todo, x;
-  
-  if(sscanf(cl->buffer, "%*d %hd", packet.len) != 1)
+cp  
+  if(sscanf(cl->buffer, "%*d %hd", &packet.len) != 1)
     {
       syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"), cl->name, cl->hostname);
       return -1;
@@ -1289,7 +1311,7 @@ int tcppacket_h(connection_t *cl)
 
   p = packet.data;
   todo = packet.len;
-  
+
   while(todo)
     {
       x = read(cl->meta_socket, p, todo);
@@ -1299,7 +1321,7 @@ int tcppacket_h(connection_t *cl)
           if(x==0)
             syslog(LOG_NOTICE, _("Connection closed by %s (%s)"), cl->name, cl->hostname);
           else
-            if(errno==EINTR)
+            if(errno==EINTR || errno==EAGAIN)	/* FIXME: select() or poll() or reimplement this evil hack */
               continue;
             else
               syslog(LOG_ERR, _("Error during reception of PACKET from %s (%s): %m"), cl->name, cl->hostname);
@@ -1311,7 +1333,9 @@ int tcppacket_h(connection_t *cl)
       p += x;
     }
 
-  return receive_packet(cl, &packet);
+  receive_packet(cl, &packet);
+cp
+  return 0;
 }
 
 /* Jumptable for the request handlers */