upstream changelog: Document merge

[userv-utils.git] / ipif / forwarder.c

diff --git a/ipif/forwarder.c b/ipif/forwarder.c
index d3a0f0fc24804bd882b00789dedd0e9ac700f26a..d92fdd9294dc34842a0d4257895384937e996975 100644 (file)
--- a/ipif/forwarder.c
+++ b/ipif/forwarder.c
@@ -1,11 +1,12 @@
 /*
- * Encrypting tunnel for userv-ipif tunnels, actual implementation
- *
+ * Encrypting tunnel for userv-ipif tunnels, actual core implementation
+ */
+/*
  * usage:
  *  udptunnel-forwarder <optchars>
  *                      <public-local-fd> <private-in-fd> <private-out-fd>
  *                      <encdec-keys-fd>
- *                      <mtu> <keepalive> <timeout>
+ *                      <mtu> <keepalive> <timeout> <reannounce>
  *                      <public-remote-addr> [<public-remote-port>]
  *                      |<mech1> [<mech1-params> ...]
  *                      |<mech2> [<mech2-params> ...]
@@ -23,7 +24,7 @@
  * writer to reader first, then keys for packets from reader to
  * writer.
  *
- * Every must be numeric.  There is very little argument checking.
+ * Every addr or port must be numeric.  There is very little argument checking.
  *
  * Exit status:
  *  SIGALARM   timed out
@@ -33,6 +34,28 @@
  *      12     usage error
  *      16     bad trouble
  */
+/*
+ * This file is part of ipif, part of userv-utils
+ *
+ * Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
+ * Copyright 1999,2003
+ *    Chancellor Masters and Scholars of the University of Cambridge
+ * Copyright 2010 Tony Finch <fanf@dotat.at>
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with userv-utils; if not, see http://www.gnu.org/licenses/.
+ */
 
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -57,7 +80,7 @@ static struct utsname uname_result;
 
 static const char *opt_chars;
 static int public_local_fd, private_in_fd, private_out_fd;
-static int mtu2, keepalive, timeout;
+static int mtu2, keepalive, timeout, reannounce;
 static int public_remote_specd;
 static struct sockaddr_in public_remote;
 static int encdec_keys_fd, encdec_keys_write, crypto_debug;
@@ -65,7 +88,7 @@ static int n_mechs;
 static const struct mechanism *mechs[MAXMECHS];
 
 static struct mechdata *md_in[MAXMECHS], *md_out[MAXMECHS];
-static size_t maxprefix, maxsuffix;
+static int maxprefix, maxsuffix;
 
 static struct buffer buf_in, buf_out;
 static unsigned char *accum_buf;
@@ -160,9 +183,12 @@ static const struct mechanism *find_mech(const char *name) {
 
 static void inbound(void) {
   static int any_recvd;
+  static time_t nextreann;
+  static unsigned long npackets, nbytes;
   
   struct sockaddr_in this_saddr;
-  int r, i, different, this_saddrlen;
+  size_t this_saddrlen;
+  int r, i, different;
   const char *emsg;
 
   buf_in.start= buf_in.base+1;
@@ -191,12 +217,18 @@ static void inbound(void) {
   for (i=n_mechs-1; i>=0; i--) {
     emsg= mechs[i]->decode(md_in[i],&buf_in);
     if (emsg) {
-      fprintf(stderr, "%s: bad packet: %s: %s\n", programid, mechs[i]->name, emsg);
+      if (*emsg)
+       fprintf(stderr, "%s: bad packet: %s: %s\n",
+               programid, mechs[i]->name, emsg);
+      else
+       cdebug(i,"silently discarded");
       return;
     }
     cdebugbuf(i, "decode", &buf_in, 3,0);
   }
 
+  npackets++;
+  nbytes += buf_in.size;
   alarm(timeout);
 
   different= (!public_remote_specd ||
@@ -223,8 +255,22 @@ static void inbound(void) {
 
     diag("tunnel open");
 
+  } else if (reannounce && now() >= nextreann) {
+
+    fprintf(stderr, "%s: tunnel still open: received %lu packets, %lu bytes\n",
+           programid, npackets, nbytes);
+
+  } else {
+
+    goto no_set_reann; /* only reset this if we don't print a message. */
+
   }
 
+  if (reannounce)
+    nextreann= now() + reannounce;
+  
+no_set_reann:
+
   any_recvd= 1;
 
   if (!buf_in.size || *buf_in.start != 0300) {
@@ -323,6 +369,7 @@ int main(int argc, const char *const *const argv_in) {
   mtu2= getarg_ulong() * 2;
   keepalive= getarg_ulong();
   timeout= getarg_ulong();
+  reannounce= getarg_ulong();
   
   arg= getarg_string();
   if (*arg) {
@@ -387,7 +434,8 @@ int main(int argc, const char *const *const argv_in) {
 
     if (keepalive) {
       tnow= now();
-      if (tnow >= nextsendka && public_remote_specd) sendpacket("\300",1);
+      if (tnow >= nextsendka && public_remote_specd)
+       sendpacket((unsigned char*)"\300",1);
       polltimeout= (nextsendka - tnow)*1000;
     } else {
       polltimeout= -1;