Greetings and challenges.

[tripe] / peer.c

diff --git a/peer.c b/peer.c
index 5e4c4f9..6b746dd 100644 (file)
--- a/peer.c
+++ b/peer.c
@@ -53,17 +53,6 @@ const tunnel_ops *tunnels[] = {
 
 /*----- Main code ---------------------------------------------------------*/
 
-static void checktimers(void)
-{
-  sel_timer *t, **tt;
-
-  tt = &sel.timers;
-  while (*tt) {
-    assert((*tt)->prev == tt);
-    tt = &(*tt)->next;
-  }
-}
-
 /* --- @p_pingtype@ --- *
  *
  * Arguments:  @unsigned msg@ = message type
@@ -144,7 +133,7 @@ found:
 
 static void p_read(int fd, unsigned mode, void *v)
 {
-  peer *p;
+  peer *p = 0;
   addr a;
   size_t sz;
   ssize_t n;
@@ -161,6 +150,28 @@ static void p_read(int fd, unsigned mode, void *v)
     return;
   }
 
+  /* --- If the packet is a greeting, don't check peers --- */
+
+  if (n && buf_i[0] == (MSG_MISC | MISC_GREET)) {
+    IF_TRACING(T_PEER, {
+      trace(T_PEER, "peer: greeting received from INET %s %u",
+           inet_ntoa(a.sin.sin_addr),
+           (unsigned)ntohs(a.sin.sin_port));
+      trace_block(T_PACKET, "peer: greeting contents", buf_i, n);
+    })
+    buf_init(&b, buf_i, n);
+    buf_getbyte(&b);
+    if (c_check(&b) || BLEFT(&b)) {
+      a_warn("PEER - invalid-greeting");
+      return;
+    }
+    a_notify("GREET %s INET %s %u",
+            b64_encode(buf_i + 1, n - 1),
+            inet_ntoa(a.sin.sin_addr),
+            (unsigned)ntohs(a.sin.sin_port));
+    return;
+  }
+
   /* --- Find the appropriate peer --- */
 
   assert(a.sa.sa_family == AF_INET);
@@ -357,7 +368,6 @@ void p_pingdone(ping *p, int rc)
   if (rc != PING_TIMEOUT) sel_rmtimer(&p->t);
   T( trace(T_PEER, "peer: ping 0x%08lx done (rc = %d)",
           (unsigned long)p->id, rc); )
-checktimers();
   if (rc >= 0) p->func(rc, p->arg);
 }
 
@@ -435,12 +445,29 @@ int p_pingsend(peer *p, ping *pg, unsigned type,
   gettimeofday(&tv, 0);
   tv.tv_sec += timeout;
   sel_addtimer(&sel, &pg->t, &tv, p_pingtimeout, pg);
-checktimers();
   T( trace(T_PEER, "peer: send %s 0x%08lx to %s",
           p_pingtype(type), (unsigned long)pg->id, p->spec.name); )
   return (0);
 }
 
+/* --- @p_greet@ --- *
+ *
+ * Arguments:  @peer *p@ = peer to send to
+ *             @const void *c@ = pointer to challenge
+ *             @size_t sz@ = size of challenge
+ *
+ * Returns:    ---
+ *
+ * Use:                Sends a greeting packet.
+ */
+
+void p_greet(peer *p, const void *c, size_t sz)
+{
+  buf *b = p_txstart(p, MSG_MISC | MISC_GREET);
+  buf_put(b, c, sz);
+  p_txend(p);
+}
+
 /* --- @p_tun@ --- *
  *
  * Arguments:  @peer *p@ = pointer to peer block