Explain the `-U' and `-G' options.

[tripe] / peer.c

diff --git a/peer.c b/peer.c
index 2f3d09ab2308bb5eee508d262c5059865d5379e7..541501cb763e5a64f8e204b6e76d39a3b01d3e4c 100644 (file)
--- a/peer.c
+++ b/peer.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: peer.c,v 1.4 2001/02/16 21:40:24 mdw Exp $
+ * $Id: peer.c,v 1.6 2001/06/19 22:07:59 mdw Exp $
  *
  * Communication with the peer
  *
@@ -29,6 +29,16 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: peer.c,v $
+ * Revision 1.6  2001/06/19 22:07:59  mdw
+ * Use magic number for packet size.
+ *
+ * Revision 1.5  2001/03/03 11:15:19  mdw
+ * Set the socket send and receive buffers to maximum.  At least this way,
+ * we won't drop large packets on the floor.  If the administrator wants to
+ * prevent fragmentation of TrIPE messages, he can lower the MTU on the
+ * tunnel interface.  Getting path-MTU stuff out of the kernel is too much
+ * system-specific hard work for this program.
+ *
  * Revision 1.4  2001/02/16 21:40:24  mdw
  * Change key exchange message interface.  Maintain statistics.
  *
@@ -273,6 +283,15 @@ void p_init(unsigned port)
 {
   int fd;
   struct sockaddr_in sin;
+  int len = PKBUFSZ;
+
+  /* --- Note on socket buffer sizes --- *
+   *
+   * For some bizarre reason, Linux 2.2 (at least) doubles the socket buffer
+   * sizes I pass to @setsockopt@.  I'm not putting special-case code here
+   * for Linux: BSD (at least TCPv2) does what I tell it rather than second-
+   * guessing me.
+   */
 
   if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
     die(EXIT_FAILURE, "socket creation failed: %s", strerror(errno));
@@ -282,6 +301,11 @@ void p_init(unsigned port)
   sin.sin_port = htons(port);
   if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
     die(EXIT_FAILURE, "bind failed: %s", strerror(errno));
+  if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) ||
+      setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len))) {
+    die(EXIT_FAILURE, "failed to set socket buffer sizes: %s",
+       strerror(errno));
+  }
   fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
   sel_initfile(&sel, &sock, fd, SEL_READ, p_read, 0);
   sel_addfile(&sock);