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Support utun devices on Mac OS X.
As of 10.6, OS X has native tunnel devices. They are implemented as sockets rather than character devices, but otherwise they appear to behave the same as Free/OpenBSD tunnels. '-d utunX' will tell iodine to use a utun device. For backward compatibility, we'll continue to default to the old tuntap devices for now. This is a port of Peter Sagerson <psagers.github@ignorare.net>'s openvpn commit 43e5016a.
This commit is contained in:
Catalin Patulea
parent
1160649794
commit
33abc0ca26
168
src/tun.c
168
src/tun.c
@ -1,6 +1,7 @@
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/*
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* Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
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* 2006-2009 Bjorn Andersson <flex@kryo.se>
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* 2013 Peter Sagerson <psagers.github@ignorare.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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@ -25,6 +26,15 @@
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef DARWIN
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#include <ctype.h>
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#include <sys/kern_control.h>
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#include <sys/sys_domain.h>
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#include <sys/ioctl.h>
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#include <net/if_utun.h>
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#include <netinet/ip.h>
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#endif
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#ifndef IFCONFIGPATH
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#define IFCONFIGPATH "PATH=/sbin:/bin "
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#endif
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@ -315,6 +325,86 @@ open_tun(const char *tun_device)
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#else /* BSD and friends */
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#ifdef DARWIN
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/* Extract the device number from the name, if given. The value returned will
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* be suitable for sockaddr_ctl.sc_unit, which means 0 for auto-assign, or
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* (n + 1) for manual.
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*/
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static int
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utun_unit(const char *dev)
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{
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const char *unit_str = dev;
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int unit = 0;
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while (*unit_str != '\0' && !isdigit(*unit_str))
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unit_str++;
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if (isdigit(*unit_str))
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unit = strtol(unit_str, NULL, 10) + 1;
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return unit;
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}
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static int
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open_utun(const char *dev)
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{
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struct sockaddr_ctl addr;
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struct ctl_info info;
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char ifname[10];
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socklen_t ifname_len = sizeof(ifname);
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int fd = -1;
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int err = 0;
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fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);
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if (fd < 0) {
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warn("open_utun: socket(PF_SYSTEM)");
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return -1;
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}
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/* Look up the kernel controller ID for utun devices. */
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bzero(&info, sizeof(info));
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strncpy(info.ctl_name, UTUN_CONTROL_NAME, MAX_KCTL_NAME);
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err = ioctl(fd, CTLIOCGINFO, &info);
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if (err != 0) {
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warn("open_utun: ioctl(CTLIOCGINFO)");
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close(fd);
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return -1;
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}
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/* Connecting to the socket creates the utun device. */
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addr.sc_len = sizeof(addr);
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addr.sc_family = AF_SYSTEM;
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addr.ss_sysaddr = AF_SYS_CONTROL;
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addr.sc_id = info.ctl_id;
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addr.sc_unit = utun_unit(dev);
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err = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
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if (err != 0) {
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warn("open_utun: connect");
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close(fd);
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return -1;
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}
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/* Retrieve the assigned interface name. */
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err = getsockopt(fd, SYSPROTO_CONTROL, UTUN_OPT_IFNAME, ifname, &ifname_len);
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if (err != 0) {
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warn("open_utun: getsockopt(UTUN_OPT_IFNAME)");
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close(fd);
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return -1;
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}
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strncpy(if_name, ifname, sizeof(if_name));
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fprintf(stderr, "Opened %s\n", ifname);
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fd_set_close_on_exec(fd);
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return fd;
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}
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#endif
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int
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open_tun(const char *tun_device)
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{
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@ -322,6 +412,15 @@ open_tun(const char *tun_device)
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int tun_fd;
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char tun_name[50];
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#ifdef DARWIN
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if (!strncmp(tun_device, "utun", 4)) {
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tun_fd = open_utun(tun_device);
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if (tun_fd >= 0) {
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return tun_fd;
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}
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}
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#endif
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if (tun_device != NULL) {
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snprintf(tun_name, sizeof(tun_name), "/dev/%s", tun_device);
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strncpy(if_name, tun_device, sizeof(if_name));
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@ -407,22 +506,32 @@ read_tun(int tun_fd, char *buf, size_t len)
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int
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write_tun(int tun_fd, char *data, size_t len)
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{
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#if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD)
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data += 4;
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len -= 4;
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#else /* !FREEBSD/DARWIN */
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#if defined (FREEBSD) || defined (NETBSD)
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/* FreeBSD/NetBSD has no header */
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int header = 0;
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#elif defined (DARWIN)
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/* Darwin tun has no header, Darwin utun does */
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int header = !strncmp(if_name, "utun", 4);
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#else /* LINUX/OPENBSD */
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int header = 1;
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#endif
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if (!header) {
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data += 4;
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len -= 4;
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} else {
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#ifdef LINUX
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x08;
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data[3] = 0x00;
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x08;
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data[3] = 0x00;
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#else /* OPENBSD */
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x00;
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data[3] = 0x02;
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#endif /* !LINUX */
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#endif /* FREEBSD */
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x00;
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data[3] = 0x02;
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#endif
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}
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if (write(tun_fd, data, len) != len) {
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warn("write_tun");
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@ -434,20 +543,29 @@ write_tun(int tun_fd, char *data, size_t len)
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ssize_t
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read_tun(int tun_fd, char *buf, size_t len)
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{
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#if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD)
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/* FreeBSD/Darwin/NetBSD has no header */
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int bytes;
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memset(buf, 0, 4);
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#if defined (FREEBSD) || defined (NETBSD)
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/* FreeBSD/NetBSD has no header */
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int header = 0;
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#elif defined (DARWIN)
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/* Darwin tun has no header, Darwin utun does */
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int header = !strncmp(if_name, "utun", 4);
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#else /* LINUX/OPENBSD */
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int header = 1;
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#endif
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bytes = read(tun_fd, buf + 4, len - 4);
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if (bytes < 0) {
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return bytes;
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if (!header) {
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int bytes;
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memset(buf, 0, 4);
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bytes = read(tun_fd, buf + 4, len - 4);
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if (bytes < 0) {
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return bytes;
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} else {
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return bytes + 4;
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}
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} else {
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return bytes + 4;
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return read(tun_fd, buf, len);
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}
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#else /* !FREEBSD */
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return read(tun_fd, buf, len);
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#endif /* !FREEBSD */
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}
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#endif
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