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UDPTunnel is a small program which can tunnel UDP packets bi-directionally over a TCP connection. Its primary purpose (and original motivation) is to allow multi-media conferences to traverse a firewall which allows only outgoing TCP connections. Source code for Unix is available from . See udptunnel.html for installation and usage instructions. See COPYRIGHT for conditions and terms of redistribution. A current version of udptunnel.html is located at . 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AC_CHECK_FUNCS(select socket strtol) AC_OUTPUT(Makefile) udptunnel-1.1.orig/install-sh0100755000273700007640000001273606720605004015155 0ustar scheffedv#!/bin/sh # # install - install a program, script, or datafile # This comes from X11R5 (mit/util/scripts/install.sh). # # Copyright 1991 by the Massachusetts Institute of Technology # # Permission to use, copy, modify, distribute, and sell this software and its # documentation for any purpose is hereby granted without fee, provided that # the above copyright notice appear in all copies and that both that # copyright notice and this permission notice appear in supporting # documentation, and that the name of M.I.T. not be used in advertising or # publicity pertaining to distribution of the software without specific, # written prior permission. M.I.T. makes no representations about the # suitability of this software for any purpose. It is provided "as is" # without express or implied warranty. # # Calling this script install-sh is preferred over install.sh, to prevent # `make' implicit rules from creating a file called install from it # when there is no Makefile. # # This script is compatible with the BSD install script, but was written # from scratch. It can only install one file at a time, a restriction # shared with many OS's install programs. # set DOITPROG to echo to test this script # Don't use :- since 4.3BSD and earlier shells don't like it. doit="${DOITPROG-}" # put in absolute paths if you don't have them in your path; or use env. vars. mvprog="${MVPROG-mv}" cpprog="${CPPROG-cp}" chmodprog="${CHMODPROG-chmod}" chownprog="${CHOWNPROG-chown}" chgrpprog="${CHGRPPROG-chgrp}" stripprog="${STRIPPROG-strip}" rmprog="${RMPROG-rm}" mkdirprog="${MKDIRPROG-mkdir}" transformbasename="" transform_arg="" instcmd="$mvprog" chmodcmd="$chmodprog 0755" chowncmd="" chgrpcmd="" stripcmd="" rmcmd="$rmprog -f" mvcmd="$mvprog" src="" dst="" dir_arg="" while [ x"$1" != x ]; do case $1 in -c) instcmd="$cpprog" shift continue;; -d) dir_arg=true shift continue;; -m) chmodcmd="$chmodprog $2" shift shift continue;; -o) chowncmd="$chownprog $2" shift shift continue;; -g) chgrpcmd="$chgrpprog $2" shift shift continue;; -s) stripcmd="$stripprog" shift continue;; -t=*) transformarg=`echo $1 | sed 's/-t=//'` shift continue;; -b=*) transformbasename=`echo $1 | sed 's/-b=//'` shift continue;; *) if [ x"$src" = x ] then src=$1 else # this colon is to work around a 386BSD /bin/sh bug : dst=$1 fi shift continue;; esac done if [ x"$src" = x ] then echo "install: no input file specified" exit 1 else true fi if [ x"$dir_arg" != x ]; then dst=$src src="" if [ -d $dst ]; then instcmd=: chmodcmd="" else instcmd=mkdir fi else # Waiting for this to be detected by the "$instcmd $src $dsttmp" command # might cause directories to be created, which would be especially bad # if $src (and thus $dsttmp) contains '*'. if [ -f $src -o -d $src ] then true else echo "install: $src does not exist" exit 1 fi if [ x"$dst" = x ] then echo "install: no destination specified" exit 1 else true fi # If destination is a directory, append the input filename; if your system # does not like double slashes in filenames, you may need to add some logic if [ -d $dst ] then dst="$dst"/`basename $src` else true fi fi ## this sed command emulates the dirname command dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'` # Make sure that the destination directory exists. # this part is taken from Noah Friedman's mkinstalldirs script # Skip lots of stat calls in the usual case. if [ ! -d "$dstdir" ]; then defaultIFS=' ' IFS="${IFS-${defaultIFS}}" oIFS="${IFS}" # Some sh's can't handle IFS=/ for some reason. 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If we want to # ignore errors from any of these, just make sure not to ignore # errors from the above "$doit $instcmd $src $dsttmp" command. if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else true;fi && if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else true;fi && if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else true;fi && if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else true;fi && # Now rename the file to the real destination. $doit $rmcmd -f $dstdir/$dstfile && $doit $mvcmd $dsttmp $dstdir/$dstfile fi && exit 0 udptunnel-1.1.orig/missing0100755000273700007640000001421306720605012014537 0ustar scheffedv#! /bin/sh # Common stub for a few missing GNU programs while installing. # Copyright (C) 1996, 1997 Free Software Foundation, Inc. # Franc,ois Pinard , 1996. # This program 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 2, 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 this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. if test $# -eq 0; then echo 1>&2 "Try \`$0 --help' for more information" exit 1 fi case "$1" in -h|--h|--he|--hel|--help) echo "\ $0 [OPTION]... PROGRAM [ARGUMENT]... Handle \`PROGRAM [ARGUMENT]...' for when PROGRAM is missing, or return an error status if there is no known handling for PROGRAM. Options: -h, --help display this help and exit -v, --version output version information and exit Supported PROGRAM values: aclocal touch file \`aclocal.m4' autoconf touch file \`configure' autoheader touch file \`config.h.in' automake touch all \`Makefile.in' files bison create \`y.tab.[ch]', if possible, from existing .[ch] flex create \`lex.yy.c', if possible, from existing .c lex create \`lex.yy.c', if possible, from existing .c makeinfo touch the output file yacc create \`y.tab.[ch]', if possible, from existing .[ch]" ;; -v|--v|--ve|--ver|--vers|--versi|--versio|--version) echo "missing - GNU libit 0.0" ;; -*) echo 1>&2 "$0: Unknown \`$1' option" echo 1>&2 "Try \`$0 --help' for more information" exit 1 ;; aclocal) echo 1>&2 "\ WARNING: \`$1' is missing on your system. You should only need it if you modified \`acinclude.m4' or \`configure.in'. You might want to install the \`Automake' and \`Perl' packages. 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You should only need it if you modified \`Makefile.am', \`acinclude.m4' or \`configure.in'. You might want to install the \`Automake' and \`Perl' packages. Grab them from any GNU archive site." find . -type f -name Makefile.am -print | sed 's/\.am$/.in/' | while read f; do touch "$f"; done ;; bison|yacc) echo 1>&2 "\ WARNING: \`$1' is missing on your system. You should only need it if you modified a \`.y' file. You may need the \`Bison' package in order for those modifications to take effect. 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You can get \`Flex' from any GNU archive site." rm -f lex.yy.c if [ $# -ne 1 ]; then eval LASTARG="\${$#}" case "$LASTARG" in *.l) SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'` if [ -f "$SRCFILE" ]; then cp "$SRCFILE" lex.yy.c fi ;; esac fi if [ ! -f lex.yy.c ]; then echo 'main() { return 0; }' >lex.yy.c fi ;; makeinfo) echo 1>&2 "\ WARNING: \`$1' is missing on your system. You should only need it if you modified a \`.texi' or \`.texinfo' file, or any other file indirectly affecting the aspect of the manual. The spurious call might also be the consequence of using a buggy \`make' (AIX, DU, IRIX). You might want to install the \`Texinfo' package or the \`GNU make' package. Grab either from any GNU archive site." file=`echo "$*" | sed -n 's/.*-o \([^ ]*\).*/\1/p'` if test -z "$file"; then file=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'` file=`sed -n '/^@setfilename/ { s/.* \([^ ]*\) *$/\1/; p; q; }' $file` fi touch $file ;; *) echo 1>&2 "\ WARNING: \`$1' is needed, and you do not seem to have it handy on your system. You might have modified some files without having the proper tools for further handling them. Check the \`README' file, it often tells you about the needed prerequirements for installing this package. You may also peek at any GNU archive site, in case some other package would contain this missing \`$1' program." exit 1 ;; esac exit 0 udptunnel-1.1.orig/mkinstalldirs0100755000273700007640000000132206720605015015746 0ustar scheffedv#! /bin/sh # mkinstalldirs --- make directory hierarchy # Author: Noah Friedman # Created: 1993-05-16 # Public domain # $Id: mkinstalldirs,v 1.13 1999/01/05 03:18:55 bje Exp $ errstatus=0 for file do set fnord `echo ":$file" | sed -ne 's/^:\//#/;s/^://;s/\// /g;s/^#/\//;p'` shift pathcomp= for d do pathcomp="$pathcomp$d" case "$pathcomp" in -* ) pathcomp=./$pathcomp ;; esac if test ! -d "$pathcomp"; then echo "mkdir $pathcomp" mkdir "$pathcomp" || lasterr=$? if test ! -d "$pathcomp"; then errstatus=$lasterr fi fi pathcomp="$pathcomp/" done done exit $errstatus # mkinstalldirs ends here udptunnel-1.1.orig/udptunnel.c0100644000273700007640000004060206720614007015327 0ustar scheffedv/* Wait for an incoming TCP connection. Once it arrives, listen for UDP on * the specified port, then send the UDP packets (with a length header) over * the TCP connection */ #include #include #include #include #include #include #include #include #include #include #include #include #include "host2ip.h" #define UDPBUFFERSIZE 65536 #define TCPBUFFERSIZE (UDPBUFFERSIZE + 2) /* UDP packet + 2 (length field) */ #define SET_MAX(fd) do { if (max < (fd) + 1) { max = (fd) + 1; } } while (0) #if (SIZEOF_SHORT == 2) typedef unsigned short u_int16; #else #error Need a typedef for a 16-bit type #endif typedef unsigned char u_int8; struct out_packet { u_int16 length; char buf[UDPBUFFERSIZE]; }; struct relay { struct sockaddr_in udpaddr; struct sockaddr_in tcpaddr; u_int8 udp_ttl; int multicast_udp; int udp_send_sock; int udp_recv_sock; int tcp_listen_sock; int tcp_sock; char buf[TCPBUFFERSIZE]; char *buf_ptr, *packet_start; int packet_length; enum {uninitialized = 0, reading_length, reading_packet} state; }; static int debug = 0; /* * usage() * Print the program usage info, and exit. */ static void usage(char *progname) { fprintf(stderr, "Usage: %s -s TCP-port [-r] [-v] UDP-addr/UDP-port[/ttl]\n", progname); fprintf(stderr, " or %s -c TCP-addr[/TCP-port] [-r] [-v] UDP-addr/UDP-port[/ttl]\n", progname); fprintf(stderr, " -s: Server mode. Wait for TCP connections on the port.\n"); fprintf(stderr, " -c: Client mode. Connect to the given address.\n"); fprintf(stderr, " -r: RTP mode. Connect/listen on ports N and N+1 for both UDP and TCP.\n"); fprintf(stderr, " Port numbers must be even.\n"); fprintf(stderr, " -v: Verbose mode. Specify -v multiple times for increased verbosity.\n"); exit(2); } /* usage */ /* * parse_args() * Parse argv, and return parsed info in **relays, *relay_count, and * *is_server. On failure, exit. */ static void parse_args(int argc, char *argv[], struct relay **relays, int *relay_count, int *is_server) { int c; char *tcphostname, *tcpportstr, *udphostname, *udpportstr, *udpttlstr; struct in_addr tcpaddr, udpaddr; int tcpport, udpport, udpttl; int i; *is_server = -1; *relay_count = 1; debug = 0; tcphostname = NULL; tcpportstr = NULL; while ((c = getopt(argc, argv, "s:c:rvh")) != EOF) { switch (c) { case 's': if (*is_server != -1) { fprintf(stderr, "%s: Only one of -s and -c may be specified.\n", argv[0]); exit(2); } *is_server = 1; tcpportstr = optarg; break; case 'c': if (*is_server != -1) { fprintf(stderr, "%s: Only one of -s and -c may be specified.\n", argv[0]); exit(2); } *is_server = 0; tcphostname = optarg; break; case 'r': *relay_count = 2; break; case 'v': debug++; break; case 'h': case '?': default: usage(argv[0]); break; } } if (*is_server == -1) { fprintf(stderr, "%s: You must specify one of -s and -c.\n", argv[0]); exit(2); } if (argc <= optind) { usage(argv[0]); } udphostname = strtok(argv[optind], ":/ "); udpportstr = strtok(NULL, ":/ "); if (udpportstr == NULL) { usage(argv[0]); } udpttlstr = strtok(NULL, ":/ "); if (!*is_server) { tcphostname = strtok(tcphostname, ":/ "); tcpportstr = strtok(NULL, ":/ "); } else { tcphostname = NULL; } errno = 0; udpport = strtol(udpportstr, NULL, 0); if (errno || udpport <= 0 || udpport >= 65536) { fprintf(stderr, "%s: invalid port number\n", udpportstr); exit(2); } if (udpttlstr != NULL) { errno = 0; udpttl = strtol(udpttlstr, NULL, 0); if (errno || udpttl < 0 || udpttl >= 256) { fprintf(stderr, "%s: invalid TTL\n", udpttlstr); exit(2); } } else { udpttl = 1; } if (tcpportstr != NULL) { errno = 0; tcpport = strtol(tcpportstr, NULL, 0); if (errno || tcpport <= 0 || tcpport >= 65536) { fprintf(stderr, "%s: invalid port number\n", tcpportstr); exit(2); } } else { tcpport = udpport; } if (*relay_count == 2 && (tcpport % 2 != 0 || udpport % 2 != 0)) { fprintf(stderr, "Port numbers must be even when using RTP mode.\n"); exit(2); } udpaddr = host2ip(udphostname); if (udpaddr.s_addr == INADDR_ANY) { fprintf(stderr, "%s: UDP host unknown\n", udphostname); exit(2); } if (*is_server) { tcpaddr.s_addr = INADDR_ANY; } else { tcpaddr = host2ip(tcphostname); if (tcpaddr.s_addr == INADDR_ANY) { fprintf(stderr, "%s: TCP host unknown\n", tcphostname); exit(2); } } *relays = (struct relay *) calloc(*relay_count, sizeof(struct relay)); if (relays == NULL) { perror("Error allocating relay structure"); exit(1); } for (i = 0; i < *relay_count; i++) { (*relays)[i].udpaddr.sin_addr = udpaddr; (*relays)[i].udpaddr.sin_port = htons(udpport + i); (*relays)[i].udpaddr.sin_family = AF_INET; (*relays)[i].udp_ttl = udpttl; (*relays)[i].multicast_udp = IN_MULTICAST(htons(udpaddr.s_addr)); (*relays)[i].tcpaddr.sin_addr = tcpaddr; (*relays)[i].tcpaddr.sin_port = htons(tcpport + i); (*relays)[i].tcpaddr.sin_family = AF_INET; } } /* parse_args */ /* setup_udp_recv() * Set up the UDP receiving socket for the specified relay. * Exit if anything goes wrong. */ static void setup_udp_recv(struct relay *relay) { int opt; struct sockaddr_in udp_recv_addr; if ((relay->udp_recv_sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { perror("setup_udp_recv: socket"); exit(1); } /* Set "reuseaddr" (and "reuseport", if it exists) */ opt = 1; if (setsockopt(relay->udp_recv_sock, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt)) < 0) { perror("setup_udp_recv: setsockopt(SO_REUSEADDR)"); exit(1); } #ifdef SO_REUSEPORT opt = 1; if (setsockopt(relay->udp_recv_sock, SOL_SOCKET, SO_REUSEPORT, (void *)&opt, sizeof(opt)) < 0) { perror("setup_udp_recv: setsockopt(SO_REUSEPORT)"); exit(1); } #endif if (relay->multicast_udp) { #ifdef IP_ADD_MEMBERSHIP struct ip_mreq mreq; /* multicast group */ mreq.imr_multiaddr = relay->udpaddr.sin_addr; mreq.imr_interface.s_addr = INADDR_ANY; if (setsockopt(relay->udp_recv_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (void *)&mreq, sizeof(mreq)) < 0) { perror("setup_udp_recv: setsockopt(IP_ADD_MEMBERSHIP)"); exit(1); } #else fprintf(stderr, "Multicast addresses not supported\n"); exit(1); #endif } memcpy(&udp_recv_addr, &(relay->udpaddr), sizeof(struct sockaddr_in)); if (!(relay->multicast_udp)) { /* XXX: some platforms don't allow you to bind to a multicast addr; these need to bind recv_addr to INADDR_ANY regardless? */ udp_recv_addr.sin_addr.s_addr = INADDR_ANY; } if (bind(relay->udp_recv_sock, (struct sockaddr *)&udp_recv_addr, sizeof(udp_recv_addr)) < 0) { perror("setup_udp_recv: bind"); exit(1); } return; } /* setup_udp_recv */ /* setup_udp_send() * Set up the UDP sending socket for the specified relay. * Exit if anything goes wrong. */ static void setup_udp_send(struct relay *relay) { /* Create UDP socket. */ if ((relay->udp_send_sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { perror("setup_udp_send: socket"); exit(1); } if (connect(relay->udp_send_sock, (struct sockaddr *) &(relay->udpaddr), sizeof(relay->udpaddr)) < 0) { perror("setup_udp_send: connect"); exit(1); } if (IN_MULTICAST(htonl(relay->udpaddr.sin_addr.s_addr))) { #ifdef IP_MULTICAST_LOOP u_int8 loop = 0; if (setsockopt(relay->udp_send_sock, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&loop, sizeof(loop)) < 0) { perror("setup_udp_send: setsockopt(IP_MULTICAST_LOOP)"); exit(1); } #endif #ifdef IP_MULTICAST_TTL if (setsockopt(relay->udp_send_sock, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&(relay->udp_ttl), sizeof(relay->udp_ttl)) < 0) { perror("setup_udp_send: setsockopt(IP_MULTICAST_TTL)"); exit(1); } #endif } } /* setup_udp_send */ /* * setup_server_listen() * Set up a TCP listening socket, and wait for an incoming connection to * it. Fill in the socket in the relay structure. * Exit if anything goes wrong. */ static void setup_server_listen(struct relay *relay) { int opt; /* Create TCP listening socket. */ if ((relay->tcp_listen_sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) { perror("setup_server_listen: socket"); exit(1); } /* Set "reuseaddr" (and "reuseport", if it exists) so that we don't * have to wait for TIME_WAIT to expire if we crash the server while * connections are open. */ opt = 1; if (setsockopt(relay->tcp_listen_sock, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt)) < 0) { perror("setup_server_listen: setsockopt(SO_REUSEADDR)"); exit(1); } #ifdef SO_REUSEPORT opt = 1; if (setsockopt(relay->tcp_listen_sock, SOL_SOCKET, SO_REUSEPORT, (void *)&opt, sizeof(opt)) < 0) { perror("setup_server_listen: setsockopt(SO_REUSEPORT)"); exit(1); } #endif if (bind(relay->tcp_listen_sock, (struct sockaddr *)&(relay->tcpaddr), sizeof(relay->tcpaddr)) < 0) { perror("setup_server_listen: bind"); exit(1); } if (listen(relay->tcp_listen_sock, 1) < 0) { perror("setup_server_listen: listen"); exit(1); } relay->tcp_sock = -1; if (debug) fprintf(stderr, "Listening for TCP connections on port %hu\n", ntohs(relay->tcpaddr.sin_port)); } /* setup_server_listen */ /* await_incoming_connections() * Wait for connections to be established to all the TCP listeners. * Fill in the tcp_sock element of each relay. * Exit on any errors. */ static void await_incoming_connections(struct relay *relays, int relay_count) { int i; fd_set readfds; int max = 0; int all_connected; do { FD_ZERO(&readfds); all_connected = 1; for (i = 0; i < relay_count; i++) { if (relays[i].tcp_sock == -1) { /* Only count relays we haven't had connections on yet */ all_connected = 0; FD_SET(relays[i].tcp_listen_sock, &readfds); SET_MAX(relays[i].tcp_listen_sock); } } if (all_connected) break; if (select(max, &readfds, NULL, NULL, NULL) < 0) { if (errno != EINTR) { perror("await_incoming_connection: select"); exit(1); } } for (i = 0; i < relay_count; i++) { if (FD_ISSET(relays[i].tcp_listen_sock, &readfds)) { struct sockaddr_in client_addr; int addrlen = sizeof(client_addr); if ((relays[i].tcp_sock = accept(relays[i].tcp_listen_sock, (struct sockaddr *) &client_addr, &addrlen)) < 0) { perror("await_incoming_connections: accept"); exit(1); } if (debug) { fprintf(stderr, "TCP connection from %s/%hu\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port)); } } } } while (!all_connected); } /* await_incoming_connections */ /* setup_tcp_client() * Connect the given relay to the desired address. Fill in the tcp_sock * element of the relay structure. * Exit on failure. */ static void setup_tcp_client(struct relay *relay) { /* Create TCP socket. */ if ((relay->tcp_sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) { perror("setup_tcp_client: socket"); exit(1); } if (connect(relay->tcp_sock, (struct sockaddr *) &(relay->tcpaddr), sizeof(relay->tcpaddr)) < 0) { perror("setup_tcp_client: connect"); exit(1); } if (debug) fprintf(stderr, "Connected TCP to %s/%hu\n", inet_ntoa(relay->tcpaddr.sin_addr), ntohs(relay->tcpaddr.sin_port)); } /* connect_tcp */ /* udp_to_tcp() * A packet has arrived on the UDP port of the relay. Forward it to the TCP * port. If we need to bail out, return non-zero. */ static int udp_to_tcp(struct relay *relay) { struct out_packet p; int buflen; struct sockaddr_in remote_udpaddr; int addrlen = sizeof(remote_udpaddr); if ((buflen = recvfrom(relay->udp_recv_sock, p.buf, UDPBUFFERSIZE, 0, (struct sockaddr *) &remote_udpaddr, &addrlen)) <= 0) { if (buflen < 0) { perror("udp_to_tcp: recv"); } return 1; } if (debug > 1) { fprintf(stderr, "Received %d byte UDP packet from %s/%hu\n", buflen, inet_ntoa(remote_udpaddr.sin_addr), ntohs(remote_udpaddr.sin_port)); } p.length = htons(buflen); if (send(relay->tcp_sock, (void *) &p, buflen+sizeof(p.length), 0) < 0) { perror("udp_to_tcp: send"); return 1; } return 0; } /* udp_to_tcp */ /* tcp_to_udp() * The TCP socket of the relay has something for us to read. Read it; if we * have a complete packet, send it to the UDP port. If we need to bail out, * return non-zero. */ static int tcp_to_udp(struct relay *relay) { int read_len; if (relay->state == uninitialized) { relay->state = reading_length; relay->buf_ptr = relay->buf; relay->packet_start = relay->buf; relay->packet_length = 0; } if ((read_len = read(relay->tcp_sock, relay->buf_ptr, (relay->buf + TCPBUFFERSIZE - relay->buf_ptr))) <= 0) { if (read_len < 0) { perror("tcp_to_udp: read"); } return 1; } relay->buf_ptr += read_len; if (relay->state == reading_length) { if (relay->buf_ptr - relay->packet_start < sizeof(u_int16)) { return 0; } relay->packet_length = ntohs(*(u_int16 *)relay->packet_start); relay->packet_start += sizeof(u_int16); relay->state = reading_packet; } if (relay->buf_ptr - relay->packet_start < relay->packet_length) { return 0; } /* If we get here, we have a complete UDP packet to send */ if (debug > 1) { fprintf(stderr, "Received packet on TCP, length %u; sending as UDP\n", relay->packet_length); } if (send(relay->udp_send_sock, relay->packet_start, relay->packet_length, 0) < 0) { if (errno != ECONNREFUSED) { perror("tcp_to_udp: send"); return 1; } else { /* There isn't a UDP listener waiting on the other end, but * that's okay, it's probably just not up at the moment or something. * Use getsockopt(SO_ERROR) to clear the error state. */ int err, len = sizeof(err); if (debug > 1) { fprintf(stderr, "ECONNREFUSED on udp_send_sock; clearing.\n"); } if (getsockopt(relay->udp_send_sock, SOL_SOCKET, SO_ERROR, (void *)&err, &len) < 0) { perror("tcp_to_udp: getsockopt(SO_ERROR)"); return 1; } } } memmove(relay->buf, relay->packet_start + relay->packet_length, relay->buf_ptr - (relay->packet_start + relay->packet_length)); relay->buf_ptr -= relay->packet_length + (relay->packet_start - relay->buf); relay->packet_start = relay->buf; relay->state = reading_length; return 0; } /* tcp_to_udp */ int main(int argc, char *argv[]) { struct relay *relays; int relay_count, is_server; int i; fd_set readfds; int max = 0; int ok; parse_args(argc, argv, &relays, &relay_count, &is_server); for (i = 0; i < relay_count; i++) { if (is_server) { setup_server_listen(&relays[i]); } else { setup_tcp_client(&relays[i]); } setup_udp_recv(&relays[i]); setup_udp_send(&relays[i]); } if (is_server) { await_incoming_connections(relays, relay_count); } do { FD_ZERO(&readfds); for (i = 0; i < relay_count; i++) { FD_SET(relays[i].tcp_sock, &readfds); SET_MAX(relays[i].tcp_sock); FD_SET(relays[i].udp_recv_sock, &readfds); SET_MAX(relays[i].udp_recv_sock); } if (select(max, &readfds, NULL, NULL, NULL) < 0) { if (errno != EINTR) { perror("main loop: select"); exit(1); } } ok = 0; for (i = 0; i < relay_count; i++) { if (FD_ISSET(relays[i].tcp_sock, &readfds)) { ok += tcp_to_udp(&relays[i]); } if (FD_ISSET(relays[i].udp_recv_sock, &readfds)) { ok += udp_to_tcp(&relays[i]); } } } while (ok == 0); exit(0); } /* main */ udptunnel-1.1.orig/host2ip.c0100755000273700007640000000313406720613741014707 0ustar scheffedv#include #include /* struct sockaddr */ #include #include /* gethostbyname() */ #include /* sockaddr_in */ #include /* inet_addr() */ #include /* YP */ #include /* isspace() */ #include "host2ip.h" static char rcsid[] = "$Id: host2ip.c,v 1.1 1996/09/20 12:49:19 sho Exp $"; /* * Return IP address given host name 'host'. Returns INADDR_ANY if not valid. * NOTE: always include the correct function prototype, * extern int host2ip(char *host); * is not correct and will cause memory problems. */ struct in_addr host2ip(char *host) { struct in_addr in, tmp; struct hostent *hep; /* Strip leading white space. */ if (host) { while (*host && isspace((int)*host)) host++; } /* Check whether this is a dotted decimal. */ if (!host) { in.s_addr = INADDR_ANY; } else if ((tmp.s_addr = inet_addr(host)) != -1) { in = tmp; } /* Attempt to resolve host name via DNS. */ else if ((hep = gethostbyname(host))) { in = *(struct in_addr *)(hep->h_addr_list[0]); } /* As a last resort, try YP. */ else { static char *domain = 0; /* YP domain */ char *value; /* key value */ int value_len; /* length of returned value */ if (!domain) yp_get_default_domain(&domain); if (yp_match(domain, "hosts.byname", host, strlen(host), &value, &value_len) == 0) { in.s_addr = inet_addr(value); } else { /* Everything failed */ in.s_addr = INADDR_ANY; } } return in; } /* host2ip */ udptunnel-1.1.orig/host2ip.h0100644000273700007640000000010406720613765014711 0ustar scheffedv#include extern struct in_addr host2ip(char *host); udptunnel-1.1.orig/COPYRIGHT0100644000273700007640000000275007345741770014456 0ustar scheffedvCopyright 1999, 2001 by Columbia University. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. udptunnel-1.1.orig/udptunnel.html0100644000273700007640000002247207345746404016071 0ustar scheffedv UDPTunnel 1.1

UDPTunnel (Version 1.1)

Name

udptunnel - Tunnel UDP packets over a TCP connection

Synopsis

udptunnel -s TCP-port [-r] [-v] UDP-addr/UDP-port[/ttl]
udptunnel -c TCP-addr[/TCP-port] [-r] [-v] UDP-addr/UDP-port[/ttl]

Description

UDPTunnel is a small program which can tunnel UDP packets bi-directionally over a TCP connection. Its primary purpose (and original motivation) is to allow multi-media conferences to traverse a firewall which allows only outgoing TCP connections.

Installation

Source code for Unix is available from: ftp://ftp.cs.columbia.edu/pub/lennox/udptunnel/.

To build, unpack the tar file, then type:

./configure
make
(optionally) make install

The configure script is a standard GNU autoconf-generated configure script; the usual options for it apply. The only option which should be necessary for normal use is --prefix=/path/to/install, which allows you to specify where make install will put the installed binary. Type ./configure --help for a full list of supported options.

UDPTunnel should compile on any Posix-compliant platform supporting sockets. It has been tested on Solaris 2.6, Linux 2.2.5 (RedHat 5.2), and FreeBSD 3.1. Information about success or failure on other platforms is welcomed.

Usage

UDPTunnel can be run in two modes: a client mode and a server mode. The client mode initiates the TCP connection before relaying UDP; the server waits for an incoming connection before doing so. After the TCP connection is established, the behavior of the two modes is identical. If you are using UDPTunnel to traverse a firewall as discussed above, the client would be run inside the firewall, and the server would be run outside it.

Options

-s TCP-port
Server mode
If udptunnel is invoked with the -s option, it runs in server mode: the server will wait for an incoming connection on the specified TCP port, and then relay UDP to and from it.
-c TCP-addr[/TCP-port]
Client mode
If udptunnel is invoked with the -c option, it runs in client mode: it will open a TCP connection to the specified TCP host and port, and then relay UDP on it.

The TCP port may be omitted in this case; it will default to the same port number as the UDP port.

-r
RTP mode
In order to facilitate tunneling both RTP and RTCP traffic for a multi-media conference, this sets up relays on two consecutive TCP and UDP ports. All specified port numbers in this case must be even. Note that both the client and the server must use the -r flag for this to work; the server will not begin relaying packets until both its connections have been established.
-v
Verbose output

This flag turns on verbose debugging output about UDPTunnel's actions. It may be given multiple times. With a single -v, information about connection establishment is printed on UDPTunnel's standard error stream; with a second one, per-packet information is also shown. Note that this latter case can produce a prodigious amount of information.

If this flag is not given, UDPTunnel will remain silent unless an error occurs.

One of the two options -c and -s must be given; if not, it is an error.

In all cases, the UDP address and port to tunnel is given after all options. UDPTunnel will listen to this adddress for packets, and will send received packets on this address. The address may be a multicast address; in this case, a multicast TTL should be specified, and tunneled packets will be sent with this TTL. All addresses, TCP and UDP, may be specified either as an IPv4 dotted-quad address (e.g. 224.2.0.1) or as a host name (e.g. conrail.cs.columbia.edu). Port numbers must be in the range of 1 to 65535; TTLs must be in the range 0 to 255.

Packet Format

The packets are sent on TCP using the obvious, simple format: a sixteen-bit length field, in network byte order, precedes each data packet. This format was proposed in early drafts of RTP for RTP-over-TCP, but was dropped from the final specification.

Known Bugs/Issues

UDPTunnel does not check incoming UDP packets to verify that they are indeed coming from the address which the user specified; it binds to INADDR_ANY, and accepts any UDP packet arriving on the specified port. This could potentially allow denial-of-service or spoofing attacks. If two or more -v options are given, per-packet identification will be printed of each packet's source address as it is received, allowing such a situation to be diagnosed.

For multicast, UDPTunnel turns off packet loopback, as it has no way to distinguish its own packets it sent out from packets genuinely arriving on the multicast group. This means that if you are tunneling traffic from or to a multicast group, both ends of UDPTunnel must be run on different hosts than any member of the group. (In general, the only way to distinguish looped packets from packets genuinely received from other applications on the local host is with application-layer labeling, as RTP does.)

UDPTunnel is designed to tunnel RTP-style traffic, in which applications send and receive UDP packets to and from the same port (or pair of ports). It does not support request/response-style traffic, in which a client request is sent from a transient port X to a well-known port Y, and the server's response is returned from port Y to port X.

UDPTunnel deliberately ignores "Connection Refused" errors on the UDP port, clearing the socket error state, so that a tunnel may be set up before conferencing tools are started on both ends. This may mean that a mis-typed UDP address or port is not recognized, as no error is printed. If two or more -v options are given, a diagnostic will be printed whenever the error state is cleared from the socket.

Once one endpoint of a tunnel is taken down, closing the socket, the other one exits as well; to re-establish the tunnel, UDPTunnel must be restarted on both sides.

IP version 6 is not supported.

History

VersionDate Notes
1.01999-05-19Initial release.
1.12001-09-06Re-released under a BSD-style license. Documentation updates. No code changes.

Copyright

Copyright © 1999, 2001 by Columbia University. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  3. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Authors

UDPTunnel was written by Jonathan Lennox. It incorporates code written by Henning Schulzrinne.

Last modified 2001-09-06 by Jonathan Lennox <lennox@cs.columbia.edu>.

A current version of this page is located at http://www.cs.columbia.edu/~lennox/udptunnel/.