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https://github.com/moparisthebest/socat
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allow tun/tap specification without IP address
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parent
02f3b29ab6
commit
9e0c4e1df5
2
CHANGES
2
CHANGES
@ -91,6 +91,8 @@ new features:
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added option max-children that limits the number of concurrent child
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processes. Thanks to Sam Liddicott for providing the patch.
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Till Maas added support for tun/tap addresses without IP address
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####################### V 1.7.1.3:
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security:
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13
doc/socat.yo
13
doc/socat.yo
@ -957,12 +957,13 @@ label(ADDRESS_TCP6_LISTEN)dit(bf(tt(TCP6-LISTEN:<port>)))
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Additional useful option:
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link(ipv6only)(OPTION_IPV6_V6ONLY)nl()
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Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(LISTEN)(GROUP_LISTEN),link(CHILD)(GROUP_CHILD),link(RANGE)(GROUP_RANGE),link(IP6)(GROUP_IP6),link(TCP)(GROUP_TCP),link(RETRY)(GROUP_RETRY) nl()
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label(ADDRESS_TUN)dit(bf(tt(TUN:<if-addr>/<bits>)))
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Creates a Linux TUN/TAP device and assignes to it the address and netmask
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defined by the parameters. The resulting network interface is ready for use
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by other processes; socat serves its "wire side". This address requires read
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and write access to the tunnel cloning device, usually code(/dev/net/tun).
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nl()
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label(ADDRESS_TUN)dit(bf(tt(TUN[:<if-addr>/<bits>])))
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Creates a Linux TUN/TAP device and optionally assignes it the address and
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netmask given by the parameters. The resulting network interface is almost
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ready for use by other processes; socat serves its "wire side". This address
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requires read and write access to the tunnel cloning device, usually
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code(/dev/net/tun), as well as permission to set some tt(ioctl()s).
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bf(Option iff-up is required to immediately activate the interface!)nl()
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Option groups: link(FD)(GROUP_FD),link(NAMED)(GROUP_NAMED),link(OPEN)(GROUP_OPEN),link(TUN)(GROUP_TUN) nl()
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Useful options:
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link(iff-up)(OPTION_IFF_UP),
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53
xio-tun.c
53
xio-tun.c
@ -1,5 +1,5 @@
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/* source: xio-tun.c */
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/* Copyright Gerhard Rieger 2007-2009 */
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/* Copyright Gerhard Rieger 2007-2011 */
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/* Published under the GNU General Public License V.2, see file COPYING */
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/* this file contains the source for opening addresses of tun/tap type */
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@ -78,8 +78,8 @@ static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xiofl
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char *ifaddr;
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int result;
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if (argc != 2) {
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Error2("%s: wrong number of parameters (%d instead of 1)",
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if (argc > 2 || argc < 0) {
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Error2("%s: wrong number of parameters (%d instead of 0 or 1)",
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argv[0], argc-1);
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}
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@ -146,30 +146,31 @@ static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xiofl
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}
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/*--------------------- setting interface address and netmask ------------*/
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if ((ifaddr = strdup(argv[1])) == NULL) {
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Error1("strdup(\"%s\"): out of memory", argv[1]);
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return STAT_RETRYLATER;
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if (argc == 2) {
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if ((ifaddr = strdup(argv[1])) == NULL) {
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Error1("strdup(\"%s\"): out of memory", argv[1]);
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return STAT_RETRYLATER;
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}
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if ((result = xioparsenetwork(ifaddr, pf, &network)) != STAT_OK) {
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/*! recover */
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return result;
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}
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socket_init(pf, (union sockaddr_union *)&ifr.ifr_addr);
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((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr =
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network.netaddr.ip4.sin_addr;
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if (Ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
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Error4("ioctl(%d, SIOCSIFADDR, {\"%s\", \"%s\"}: %s",
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sockfd, ifr.ifr_name, ifaddr, strerror(errno));
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}
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((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr =
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network.netmask.ip4.sin_addr;
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if (Ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
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Error4("ioctl(%d, SIOCSIFNETMASK, {\"0x%08u\", \"%s\"}, %s",
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sockfd, ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr,
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ifaddr, strerror(errno));
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}
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free(ifaddr);
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}
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if ((result = xioparsenetwork(ifaddr, pf, &network)) != STAT_OK) {
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/*! recover */
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return result;
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}
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socket_init(pf, (union sockaddr_union *)&ifr.ifr_addr);
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((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr =
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network.netaddr.ip4.sin_addr;
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if (Ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
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Error4("ioctl(%d, SIOCSIFADDR, {\"%s\", \"%s\"}: %s",
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sockfd, ifr.ifr_name, ifaddr, strerror(errno));
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}
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((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr =
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network.netmask.ip4.sin_addr;
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if (Ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
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Error4("ioctl(%d, SIOCSIFNETMASK, {\"0x%08u\", \"%s\"}, %s",
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sockfd, ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr,
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ifaddr, strerror(errno));
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}
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free(ifaddr);
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/*--------------------- setting interface flags --------------------------*/
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applyopts_single(&xfd->stream, opts, PH_FD);
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