X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fbsd%2Fdevice.c;h=0d41c96f8b67a420d436a94d89b0db79e40dee11;hp=cb65dbbf307484d1cd9c4dc5fdbe832c1bc3d278;hb=a0a8f8f81fc8da068e93088c7c13f689a96fac66;hpb=a649aa51bf8e5b5fcc76061c9f660122a08245a8 diff --git a/src/bsd/device.c b/src/bsd/device.c index cb65dbbf..0d41c96f 100644 --- a/src/bsd/device.c +++ b/src/bsd/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction BSD tun/tap device Copyright (C) 2001-2005 Ivo Timmermans, - 2001-2013 Guus Sliepen + 2001-2016 Guus Sliepen 2009 Grzegorz Dymarek This program is free software; you can redistribute it and/or modify @@ -34,12 +34,14 @@ #include "bsd/tunemu.h" #endif +#ifdef HAVE_NET_IF_UTUN_H +#include +#include +#include +#endif + #define DEFAULT_TUN_DEVICE "/dev/tun0" -#if defined(HAVE_DARWIN) || defined(HAVE_FREEBSD) || defined(HAVE_NETBSD) #define DEFAULT_TAP_DEVICE "/dev/tap0" -#else -#define DEFAULT_TAP_DEVICE "/dev/tun0" -#endif typedef enum device_type { DEVICE_TYPE_TUN, @@ -48,6 +50,7 @@ typedef enum device_type { #ifdef ENABLE_TUNEMU DEVICE_TYPE_TUNEMU, #endif + DEVICE_TYPE_UTUN, } device_type_t; int device_fd = -1; @@ -62,34 +65,75 @@ static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD; static device_type_t device_type = DEVICE_TYPE_TUN; #endif -static bool setup_device(void) { - char *type; +#ifdef HAVE_NET_IF_UTUN_H +static bool setup_utun(void) { + device_fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL); + if(device_fd == -1) { + logger(DEBUG_ALWAYS, LOG_ERR, "Could not open PF_SYSTEM socket: %s\n", strerror(errno)); + return false; + } - if(!get_config_string(lookup_config(config_tree, "Device"), &device)) { - if(routing_mode == RMODE_ROUTER) - device = xstrdup(DEFAULT_TUN_DEVICE); - else - device = xstrdup(DEFAULT_TAP_DEVICE); + struct ctl_info info = {}; + strlcpy(info.ctl_name, UTUN_CONTROL_NAME, sizeof info.ctl_name); + + if(ioctl(device_fd, CTLIOCGINFO, &info) == -1) { + logger(DEBUG_ALWAYS, LOG_ERR, "ioctl(CTLIOCGINFO) failed: %s", strerror(errno)); + return false; } - if(!get_config_string(lookup_config(config_tree, "Interface"), &iface)) - iface = NULL; -#ifndef TAPGIFNAME - if (iface) { - logger(DEBUG_ALWAYS, LOG_WARNING, "Ignoring specified interface name '%s' as device rename is not supported on this platform", iface); - free(iface); - iface = NULL; + int unit = -1; + char *p = strstr(device, "utun"), *e = NULL; + if(p) { + unit = strtol(p + 4, &e, 10); + if(!e) + unit = -1; + } + + struct sockaddr_ctl sc = { + .sc_id = info.ctl_id, + .sc_len = sizeof sc, + .sc_family = AF_SYSTEM, + .ss_sysaddr = AF_SYS_CONTROL, + .sc_unit = unit + 1, + }; + + if(connect(device_fd, (struct sockaddr *)&sc, sizeof(sc)) == -1) { + logger(DEBUG_ALWAYS, LOG_ERR, "Could not connect utun socket: %s\n", strerror(errno)); + return false; + } + + char name[64] = ""; + socklen_t len = sizeof name; + if(getsockopt(device_fd, SYSPROTO_CONTROL, UTUN_OPT_IFNAME, name, &len)) { + iface = xstrdup(device); + } else { + iface = xstrdup(name); } + + device_info = "OS X utun device"; + + logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info); + + return true; +} #endif - if (!iface) - iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device); +static bool setup_device(void) { + get_config_string(lookup_config(config_tree, "Device"), &device); + + // Find out if it's supposed to be a tun or a tap device + + char *type; if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) { if(!strcasecmp(type, "tun")) /* use default */; #ifdef ENABLE_TUNEMU else if(!strcasecmp(type, "tunemu")) device_type = DEVICE_TYPE_TUNEMU; +#endif +#ifdef HAVE_NET_IF_UTUN_H + else if(!strcasecmp(type, "utun")) + device_type = DEVICE_TYPE_UTUN; #endif else if(!strcasecmp(type, "tunnohead")) device_type = DEVICE_TYPE_TUN; @@ -102,10 +146,31 @@ static bool setup_device(void) { return false; } } else { - if(strstr(device, "tap") || routing_mode != RMODE_ROUTER) +#ifdef HAVE_NET_IF_UTUN_H + if(device && (strncmp(device, "utun", 4) == 0 || strncmp(device, "/dev/utun", 9) == 0)) + device_type = DEVICE_TYPE_UTUN; + else +#endif + if((device && strstr(device, "tap")) || routing_mode != RMODE_ROUTER) device_type = DEVICE_TYPE_TAP; } + if(routing_mode == RMODE_SWITCH && device_type != DEVICE_TYPE_TAP) { + logger(DEBUG_ALWAYS, LOG_ERR, "Only tap devices support switch mode!"); + return false; + } + + // Find out which device file to open + + if(!device) { + if(device_type == DEVICE_TYPE_TAP) + device = xstrdup(DEFAULT_TAP_DEVICE); + else + device = xstrdup(DEFAULT_TUN_DEVICE); + } + + // Open the device + switch(device_type) { #ifdef ENABLE_TUNEMU case DEVICE_TYPE_TUNEMU: { @@ -113,6 +178,10 @@ static bool setup_device(void) { device_fd = tunemu_open(dynamic_name); } break; +#endif +#ifdef HAVE_NET_IF_UTUN_H + case DEVICE_TYPE_UTUN: + return setup_utun(); #endif default: device_fd = open(device, O_RDWR | O_NONBLOCK); @@ -127,6 +196,27 @@ static bool setup_device(void) { fcntl(device_fd, F_SETFD, FD_CLOEXEC); #endif + // Guess what the corresponding interface is called + + char *realname; + +#if defined(HAVE_FDEVNAME) + realname = fdevname(device_fd) ? : device; +#elif defined(HAVE_DEVNAME) + struct stat buf; + if(!fstat(device_fd, &buf)) + realname = devname(buf.st_rdev, S_IFCHR) ? : device; +#else + realname = device; +#endif + + if(!get_config_string(lookup_config(config_tree, "Interface"), &iface)) + iface = xstrdup(strrchr(realname, '/') ? strrchr(realname, '/') + 1 : realname); + else if(strcmp(iface, strrchr(realname, '/') ? strrchr(realname, '/') + 1 : realname)) + logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: Interface does not match Device. $INTERFACE might be set incorrectly."); + + // Configure the device as best as we can + switch(device_type) { default: device_type = DEVICE_TYPE_TUN; @@ -191,6 +281,11 @@ static bool setup_device(void) { #endif } +#ifdef SIOCGIFADDR + if(overwrite_mac) + ioctl(device_fd, SIOCGIFADDR, mymac.x); +#endif + logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info); return true; @@ -221,10 +316,10 @@ static bool read_packet(vpn_packet_t *packet) { #ifdef ENABLE_TUNEMU case DEVICE_TYPE_TUNEMU: if(device_type == DEVICE_TYPE_TUNEMU) - inlen = tunemu_read(device_fd, packet->data + 14, MTU - 14); + inlen = tunemu_read(device_fd, DATA(packet) + 14, MTU - 14); else #endif - inlen = read(device_fd, packet->data + 14, MTU - 14); + inlen = read(device_fd, DATA(packet) + 14, MTU - 14); if(inlen <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, @@ -232,61 +327,59 @@ static bool read_packet(vpn_packet_t *packet) { return false; } - switch(packet->data[14] >> 4) { + switch(DATA(packet)[14] >> 4) { case 4: - packet->data[12] = 0x08; - packet->data[13] = 0x00; + DATA(packet)[12] = 0x08; + DATA(packet)[13] = 0x00; break; case 6: - packet->data[12] = 0x86; - packet->data[13] = 0xDD; + DATA(packet)[12] = 0x86; + DATA(packet)[13] = 0xDD; break; default: logger(DEBUG_TRAFFIC, LOG_ERR, "Unknown IP version %d while reading packet from %s %s", - packet->data[14] >> 4, device_info, device); + DATA(packet)[14] >> 4, device_info, device); return false; } - memset(packet->data, 0, 12); + memset(DATA(packet), 0, 12); packet->len = inlen + 14; break; + case DEVICE_TYPE_UTUN: case DEVICE_TYPE_TUNIFHEAD: { - u_int32_t type; - struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, MTU - 14}}; - - if((inlen = readv(device_fd, vector, 2)) <= 0) { + if((inlen = read(device_fd, packet->data + 10, MTU - 10)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; } - switch (ntohl(type)) { - case AF_INET: - packet->data[12] = 0x08; - packet->data[13] = 0x00; + switch (packet->data[14] >> 4) { + case 4: + DATA(packet)[12] = 0x08; + DATA(packet)[13] = 0x00; break; - case AF_INET6: - packet->data[12] = 0x86; - packet->data[13] = 0xDD; + case 6: + DATA(packet)[12] = 0x86; + DATA(packet)[13] = 0xDD; break; default: logger(DEBUG_TRAFFIC, LOG_ERR, - "Unknown address family %x while reading packet from %s %s", - ntohl(type), device_info, device); + "Unknown IP version %d while reading packet from %s %s", + packet->data[14] >> 4, device_info, device); return false; } - memset(packet->data, 0, 12); + memset(DATA(packet), 0, 12); packet->len = inlen + 10; break; } case DEVICE_TYPE_TAP: - if((inlen = read(device_fd, packet->data, MTU)) <= 0) { + if((inlen = read(device_fd, DATA(packet), MTU)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; @@ -311,19 +404,17 @@ static bool write_packet(vpn_packet_t *packet) { switch(device_type) { case DEVICE_TYPE_TUN: - if(write(device_fd, packet->data + 14, packet->len - 14) < 0) { + if(write(device_fd, DATA(packet) + 14, packet->len - 14) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, strerror(errno)); return false; } break; + case DEVICE_TYPE_UTUN: case DEVICE_TYPE_TUNIFHEAD: { - u_int32_t type; - struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, packet->len - 14}}; - int af; - - af = (packet->data[12] << 8) + packet->data[13]; + int af = (DATA(packet)[12] << 8) + DATA(packet)[13]; + uint32_t type; switch (af) { case 0x0800: @@ -339,7 +430,9 @@ static bool write_packet(vpn_packet_t *packet) { return false; } - if(writev(device_fd, vector, 2) < 0) { + memcpy(packet->data + 10, &type, sizeof type); + + if(write(device_fd, packet->data + 10, packet->len - 10) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); return false; @@ -348,7 +441,7 @@ static bool write_packet(vpn_packet_t *packet) { } case DEVICE_TYPE_TAP: - if(write(device_fd, packet->data, packet->len) < 0) { + if(write(device_fd, DATA(packet), packet->len) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, strerror(errno)); return false; @@ -357,7 +450,7 @@ static bool write_packet(vpn_packet_t *packet) { #ifdef ENABLE_TUNEMU case DEVICE_TYPE_TUNEMU: - if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) { + if(tunemu_write(device_fd, DATA(packet) + 14, packet->len - 14) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, strerror(errno)); return false;