mirror of
https://github.com/moparisthebest/socat
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211 lines
10 KiB
C
211 lines
10 KiB
C
/* source: xio-tun.c */
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/* Copyright Gerhard Rieger 2007-2008 */
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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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#include "xiosysincludes.h"
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#if WITH_TUN
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#include "xioopen.h"
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#include "xio-named.h"
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#include "xio-socket.h"
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#include "xio-ip.h"
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#include "xio-tun.h"
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static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *fd, unsigned groups, int dummy1, int dummy2, int dummy3);
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/****** TUN addresses ******/
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const struct optdesc opt_tun_device = { "tun-device", NULL, OPT_TUN_DEVICE, GROUP_TUN, PH_OPEN, TYPE_FILENAME, OFUNC_SPEC };
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const struct optdesc opt_tun_name = { "tun-name", NULL, OPT_TUN_NAME, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };
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const struct optdesc opt_tun_type = { "tun-type", NULL, OPT_TUN_TYPE, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };
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const struct optdesc opt_iff_no_pi = { "iff-no-pi", "no-pi", OPT_IFF_NO_PI, GROUP_TUN, PH_FD, TYPE_BOOL, OFUNC_SPEC };
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/*0 const struct optdesc opt_interface_addr = { "interface-addr", "address", OPT_INTERFACE_ADDR, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };*/
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/*0 const struct optdesc opt_interface_netmask = { "interface-netmask", "netmask", OPT_INTERFACE_NETMASK, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };*/
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const struct optdesc opt_iff_up = { "iff-up", "up", OPT_IFF_UP, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_UP };
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const struct optdesc opt_iff_broadcast = { "iff-broadcast", NULL, OPT_IFF_BROADCAST, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_BROADCAST };
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const struct optdesc opt_iff_debug = { "iff-debug" , NULL, OPT_IFF_DEBUG, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_DEBUG };
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const struct optdesc opt_iff_loopback = { "iff-loopback" , "loopback", OPT_IFF_LOOPBACK, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_LOOPBACK };
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const struct optdesc opt_iff_pointopoint = { "iff-pointopoint", "pointopoint",OPT_IFF_POINTOPOINT, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_POINTOPOINT };
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const struct optdesc opt_iff_notrailers = { "iff-notrailers", "notrailers", OPT_IFF_NOTRAILERS, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_NOTRAILERS };
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const struct optdesc opt_iff_running = { "iff-running", "running", OPT_IFF_RUNNING, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_RUNNING };
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const struct optdesc opt_iff_noarp = { "iff-noarp", "noarp", OPT_IFF_NOARP, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_NOARP };
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const struct optdesc opt_iff_promisc = { "iff-promisc", "promisc", OPT_IFF_PROMISC, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_PROMISC };
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const struct optdesc opt_iff_allmulti = { "iff-allmulti", "allmulti", OPT_IFF_ALLMULTI, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_ALLMULTI };
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const struct optdesc opt_iff_master = { "iff-master", "master", OPT_IFF_MASTER, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_MASTER };
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const struct optdesc opt_iff_slave = { "iff-slave", "slave", OPT_IFF_SLAVE, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_SLAVE };
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const struct optdesc opt_iff_multicast = { "iff-multicast", NULL, OPT_IFF_MULTICAST, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_MULTICAST };
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const struct optdesc opt_iff_portsel = { "iff-portsel", "portsel", OPT_IFF_PORTSEL, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_PORTSEL };
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const struct optdesc opt_iff_automedia = { "iff-automedia", "automedia", OPT_IFF_AUTOMEDIA, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_AUTOMEDIA };
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/*const struct optdesc opt_iff_dynamic = { "iff-dynamic", "dynamic", OPT_IFF_DYNAMIC, GROUP_INTERFACE, PH_FD, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.tun.iff_opts), sizeof(short), IFF_DYNAMIC };*/
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#if LATER
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const struct optdesc opt_route = { "route", NULL, OPT_ROUTE, GROUP_INTERFACE, PH_INIT, TYPE_STRING, OFUNC_SPEC };
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#endif
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const struct addrdesc xioaddr_tun = { "tun", 3, xioopen_tun, GROUP_FD|GROUP_CHR|GROUP_NAMED|GROUP_OPEN|GROUP_TUN, 0, 0, 0 HELP(":<ip-addr>/<bits>") };
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/* "if-name"=tun3
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// "route"=address/netmask
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// "ip6-route"=address/netmask
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// "iff-broadcast"
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// "iff-debug"
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// "iff-promisc"
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// see .../linux/if.h
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*/
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#if LATER
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/* sub options for route option */
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#define IFOPT_ROUTE 1
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static const struct optdesc opt_route_tos = { "route", NULL, IFOPT_ROUTE, };
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static const struct optname xio_route_options[] = {
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{"tos", &xio_route_tos }
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} ;
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#endif
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static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *xfd, unsigned groups, int dummy1, int dummy2, int dummy3) {
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char *tundevice = NULL;
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char *tunname = NULL, *tuntype = NULL;
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int pf = /*! PF_UNSPEC*/ PF_INET;
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struct xiorange network;
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bool no_pi = false;
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const char *namedargv[] = { "tun", NULL, NULL };
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int rw = (xioflags & XIO_ACCMODE);
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bool exists;
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struct ifreq ifr;
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int sockfd;
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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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argv[0], argc-1);
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}
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if (retropt_string(opts, OPT_TUN_DEVICE, &tundevice) != 0) {
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tundevice = strdup("/dev/net/tun");
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}
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/*! socket option here? */
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retropt_socket_pf(opts, &pf);
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namedargv[1] = tundevice;
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/* open the tun cloning device */
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if ((result = _xioopen_named_early(2, namedargv, xfd, groups, &exists, opts)) < 0) {
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return result;
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}
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/*========================= the tunnel interface =========================*/
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Notice("creating tunnel network interface");
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if ((result = _xioopen_open(tundevice, rw, opts)) < 0)
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return result;
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xfd->stream.fd = result;
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/* prepare configuration of the new network interface */
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memset(&ifr, 0,sizeof(ifr));
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if (retropt_string(opts, OPT_TUN_NAME, &tunname) == 0) {
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strncpy(ifr.ifr_name, tunname, IFNAMSIZ);
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free(tunname);
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} else {
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ifr.ifr_name[0] = '\0';
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}
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ifr.ifr_flags = IFF_TUN;
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if (retropt_string(opts, OPT_TUN_TYPE, &tuntype) == 0) {
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if (!strcmp(tuntype, "tap")) {
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ifr.ifr_flags = IFF_TAP;
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} else if (strcmp(tuntype, "tun")) {
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Error1("unknown tun-type \"%s\"", tuntype);
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}
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}
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if (retropt_bool(opts, OPT_IFF_NO_PI, &no_pi) == 0) {
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if (no_pi) {
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ifr.ifr_flags |= IFF_NO_PI;
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#if 0 /* not neccessary for now */
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} else {
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ifr.ifr_flags &= ~IFF_NO_PI;
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#endif
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}
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}
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if (Ioctl(xfd->stream.fd, TUNSETIFF, &ifr) < 0) {
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Error3("ioctl(%d, TUNSETIFF, {\"%s\"}: %s",
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xfd->stream.fd, ifr.ifr_name, strerror(errno));
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Close(xfd->stream.fd);
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}
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/*===================== setting interface properties =====================*/
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/* we seem to need a socket for manipulating the interface */
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if ((sockfd = Socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
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Error1("socket(PF_INET, SOCK_DGRAM, 0): %s", strerror(errno));
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sockfd = xfd->stream.fd; /* desparate fallback attempt */
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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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}
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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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if (Ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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Error3("ioctl(%d, SIOCGIFFLAGS, {\"%s\"}: %s",
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sockfd, ifr.ifr_name, strerror(errno));
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}
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Debug2("\"%s\": system set flags: 0x%hx", ifr.ifr_name, ifr.ifr_flags);
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ifr.ifr_flags |= xfd->stream.para.tun.iff_opts[0];
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ifr.ifr_flags &= ~xfd->stream.para.tun.iff_opts[1];
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Debug2("\"%s\": xio merged flags: 0x%hx", ifr.ifr_name, ifr.ifr_flags);
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if (Ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
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Error4("ioctl(%d, SIOCSIFFLAGS, {\"%s\", %hd}: %s",
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sockfd, ifr.ifr_name, ifr.ifr_flags, strerror(errno));
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}
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ifr.ifr_flags = 0;
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if (Ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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Error3("ioctl(%d, SIOCGIFFLAGS, {\"%s\"}: %s",
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sockfd, ifr.ifr_name, strerror(errno));
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}
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Debug2("\"%s\": resulting flags: 0x%hx", ifr.ifr_name, ifr.ifr_flags);
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#if LATER
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applyopts_named(tundevice, opts, PH_FD);
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#endif
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applyopts(xfd->stream.fd, opts, PH_FD);
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applyopts_cloexec(xfd->stream.fd, opts);
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applyopts_fchown(xfd->stream.fd, opts);
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if ((result = _xio_openlate(&xfd->stream, opts)) < 0)
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return result;
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return 0;
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}
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#endif /* WITH_TUN */
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