663 lines
16 KiB
C++
663 lines
16 KiB
C++
// SPDX-License-Identifier: AGPL-1.0-only
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// Copyright (C) 2018 Ludvig Strigeus <info@tunsafe.com>. All Rights Reserved.
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#include "network_bsd_common.h"
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#include "tunsafe_endian.h"
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#include "util.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <assert.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <net/route.h>
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#include <sys/time.h>
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#include <pthread.h>
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#if defined(OS_MACOSX)
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#include <sys/kern_control.h>
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#include <net/if_utun.h>
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#include <sys/sys_domain.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#include <net/if_dl.h>
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#elif defined(OS_FREEBSD)
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#include <net/if_tun.h>
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#include <net/if_dl.h>
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#elif defined(OS_LINUX)
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#include <sys/prctl.h>
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#endif
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void SetThreadName(const char *name) {
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#if defined(OS_LINUX)
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prctl(PR_SET_NAME, name, 0, 0, 0);
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#endif // defined(OS_LINUX)
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}
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#if defined(OS_MACOSX) || defined(OS_FREEBSD)
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struct MyRouteMsg {
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struct rt_msghdr hdr;
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uint32 pad;
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struct sockaddr_in target;
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struct sockaddr_in netmask;
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};
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struct MyRouteReply {
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struct rt_msghdr hdr;
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uint8 buf[512];
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};
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// Zero gets rounded up
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#if defined(OS_MACOSX)
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#define RTMSG_ROUNDUP(a) ((a) ? ((((a) - 1) | (sizeof(uint32_t) - 1)) + 1) : sizeof(uint32_t))
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#else
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#define RTMSG_ROUNDUP(a) ((a) ? ((((a) - 1) | (sizeof(long) - 1)) + 1) : sizeof(long))
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#endif
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static bool GetDefaultRoute(char *iface, size_t iface_size, uint32 *gw_addr) {
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int fd, pid, len;
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union {
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MyRouteMsg rt;
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MyRouteReply rep;
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};
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fd = socket(PF_ROUTE, SOCK_RAW, AF_INET);
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if (fd < 0)
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return false;
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memset(&rt, 0, sizeof(rt));
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rt.hdr.rtm_type = RTM_GET;
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rt.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
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rt.hdr.rtm_version = RTM_VERSION;
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rt.hdr.rtm_seq = 0;
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rt.hdr.rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP;
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rt.target.sin_family = AF_INET;
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rt.netmask.sin_family = AF_INET;
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rt.target.sin_len = sizeof(struct sockaddr_in);
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rt.netmask.sin_len = sizeof(struct sockaddr_in);
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rt.hdr.rtm_msglen = sizeof(rt);
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if (write(fd, (char*)&rt, sizeof(rt)) != sizeof(rt)) {
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RERROR("PF_ROUTE write failed.");
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close(fd);
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return false;
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}
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pid = getpid();
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do {
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len = read(fd, (char *)&rep, sizeof(rep));
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if (len <= 0) {
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RERROR("PF_ROUTE read failed.");
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close(fd);
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return false;
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}
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} while (rep.hdr.rtm_seq != 0 || rep.hdr.rtm_pid != pid);
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close(fd);
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const struct sockaddr_dl *ifp = NULL;
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const struct sockaddr_in *gw = NULL;
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uint8 *pos = rep.buf;
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for (int i = 1; i && i < rep.hdr.rtm_addrs; i <<= 1) {
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if (rep.hdr.rtm_addrs & i) {
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if (1 > rep.buf + 512 - pos)
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break; // invalid
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size_t len = RTMSG_ROUNDUP(((struct sockaddr*)pos)->sa_len);
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if (len > rep.buf + 512 - pos)
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break; // invalid
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// RINFO("rtm %d %d", i, ((struct sockaddr*)pos)->sa_len);
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if (i == RTA_IFP && ((struct sockaddr*)pos)->sa_len >= sizeof(struct sockaddr_dl)) {
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ifp = (struct sockaddr_dl *)pos;
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} else if (i == RTA_GATEWAY && ((struct sockaddr*)pos)->sa_len >= sizeof(struct sockaddr_in)) {
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gw = (struct sockaddr_in *)pos;
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}
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pos += len;
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}
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}
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if (ifp && ifp->sdl_nlen && ifp->sdl_nlen < iface_size) {
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iface[ifp->sdl_nlen] = 0;
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memcpy(iface, ifp->sdl_data, ifp->sdl_nlen);
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if (gw && gw->sin_family == AF_INET) {
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*gw_addr = ReadBE32(&gw->sin_addr);
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return true;
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}
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}
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// RINFO("Read %d %d %d", len, rep.hdr.rtm_addrs, (int)sizeof(struct rt_msghdr ));
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return false;
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}
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#endif // defined(OS_MACOSX) || defined(OS_FREEBSD)
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#if defined(OS_LINUX)
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static bool GetDefaultRoute(char *iface, size_t iface_size, uint32 *gw_addr) {
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return false;
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}
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#endif // defined(OS_LINUX)
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#if defined(OS_MACOSX)
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static mach_timebase_info_data_t timebase = { 0, 0 };
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static uint64_t initclock;
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void InitOsxGetMilliseconds() {
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if (mach_timebase_info(&timebase) != 0)
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abort();
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initclock = mach_absolute_time();
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timebase.denom *= 1000000;
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}
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uint64 OsGetMilliseconds()
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{
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uint64_t clock = mach_absolute_time() - initclock;
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return clock * (uint64_t)timebase.numer / (uint64_t)timebase.denom;
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}
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#else // defined(OS_MACOSX)
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uint64 OsGetMilliseconds() {
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
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//error
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fprintf(stderr, "clock_gettime failed\n");
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exit(1);
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}
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return (uint64)ts.tv_sec * 1000 + (ts.tv_nsec / 1000000);
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}
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#endif
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void OsGetTimestampTAI64N(uint8 dst[12]) {
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struct timeval tv;
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gettimeofday(&tv, NULL);
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uint64 secs_since_epoch = tv.tv_sec + 0x400000000000000a;
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uint32 nanos = tv.tv_usec * 1000;
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WriteBE64(dst, secs_since_epoch);
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WriteBE32(dst + 8, nanos);
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}
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void OsGetRandomBytes(uint8 *data, size_t data_size) {
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int fd = open("/dev/urandom", O_RDONLY);
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int r = read(fd, data, data_size);
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if (r < 0) r = 0;
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close(fd);
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for (; r < data_size; r++)
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data[r] = rand() >> 6;
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}
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void OsInterruptibleSleep(int millis) {
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usleep((useconds_t)millis * 1000);
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}
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#if defined(OS_MACOSX)
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int open_tun(char *devname, size_t devname_size) {
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struct sockaddr_ctl sc;
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struct ctl_info ctlinfo = {0};
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int fd;
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memcpy(ctlinfo.ctl_name, UTUN_CONTROL_NAME, sizeof(UTUN_CONTROL_NAME));
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for(int i = 0; i < 256; i++) {
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fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);
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if (fd < 0) {
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RERROR("socket(SYSPROTO_CONTROL) failed");
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return -1;
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}
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if (ioctl(fd, CTLIOCGINFO, &ctlinfo) == -1) {
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RERROR("ioctl(CTLIOCGINFO) failed: %d", errno);
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close(fd);
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return -1;
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}
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sc.sc_id = ctlinfo.ctl_id;
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sc.sc_len = sizeof(sc);
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sc.sc_family = AF_SYSTEM;
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sc.ss_sysaddr = AF_SYS_CONTROL;
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sc.sc_unit = i + 1;
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if (connect(fd, (struct sockaddr *)&sc, sizeof(sc)) == 0) {
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socklen_t devname_size2 = devname_size;
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if (getsockopt(fd, SYSPROTO_CONTROL, UTUN_OPT_IFNAME, devname, &devname_size2)) {
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RERROR("getsockopt(UTUN_OPT_IFNAME) failed");
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close(fd);
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return -1;
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}
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return fd;
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}
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close(fd);
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}
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return -1;
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}
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#elif defined(OS_FREEBSD)
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int open_tun(char *devname, size_t devname_size) {
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char buf[32];
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int tun_fd;
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// First open an existing tun device
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for(int i = 0; i < 256; i++) {
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sprintf(buf, "/dev/tun%d", i);
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tun_fd = open(buf, O_RDWR);
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if (tun_fd >= 0) goto did_open;
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}
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tun_fd = open("/dev/tun", O_RDWR);
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if (tun_fd < 0)
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return tun_fd;
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did_open:
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if (!fdevname_r(tun_fd, devname, devname_size)) {
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RERROR("Unable to get name of tun device");
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close(tun_fd);
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return -1;
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}
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int flags = IFF_POINTOPOINT | IFF_MULTICAST;
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if (ioctl(tun_fd, TUNSIFMODE, &flags) < 0) {
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RERROR("ioctl(TUNSIFMODE) failed");
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close(tun_fd);
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return -1;
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}
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flags = 1;
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if (ioctl(tun_fd, TUNSIFHEAD, &flags) < 0) {
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RERROR("ioctl(TUNSIFHEAD) failed");
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close(tun_fd);
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return -1;
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}
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return tun_fd;
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}
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#elif defined(OS_LINUX)
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int open_tun(char *devname, size_t devname_size) {
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int fd, err;
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struct ifreq ifr;
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fd = open("/dev/net/tun", O_RDWR);
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if (fd < 0)
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return fd;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) {
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close(fd);
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return err;
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}
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strcpy(devname, ifr.ifr_name);
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return fd;
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}
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#endif
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int open_udp(int listen_on_port) {
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int udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (udp_fd < 0) return udp_fd;
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sockaddr_in sin = {0};
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sin.sin_family = AF_INET;
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sin.sin_port = htons(listen_on_port);
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if (bind(udp_fd, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
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close(udp_fd);
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return -1;
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}
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return udp_fd;
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}
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TunsafeBackendBsd::TunsafeBackendBsd()
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: processor_(NULL) {
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}
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TunsafeBackendBsd::~TunsafeBackendBsd() {
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}
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static uint32 CidrToNetmaskV4(int cidr) {
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return cidr == 32 ? 0xffffffff : 0xffffffff << (32 - cidr);
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}
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static uint32 ComputeIpv4DefaultRoute(uint32 ip, uint32 netmask) {
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uint32 default_route_v4 = (ip & netmask) | 1;
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if (default_route_v4 == ip)
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default_route_v4++;
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return default_route_v4;
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}
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static void ComputeIpv6DefaultRoute(const uint8 *ipv6_address, uint8 ipv6_cidr, uint8 *default_route_v6) {
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memcpy(default_route_v6, ipv6_address, 16);
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// clear the last bits of the ipv6 address to match the cidr.
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size_t n = (ipv6_cidr + 7) >> 3;
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memset(&default_route_v6[n], 0, 16 - n);
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if (n == 0)
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return;
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// adjust the final byte
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default_route_v6[n - 1] &= ~(0xff >> (ipv6_cidr & 7));
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// set the very last byte to something
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default_route_v6[15] |= 1;
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// ensure it doesn't collide
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if (memcmp(default_route_v6, ipv6_address, 16) == 0)
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default_route_v6[15] ^= 3;
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}
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void TunsafeBackendBsd::AddRoute(uint32 ip, uint32 cidr, uint32 gw) {
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uint32 ip_be, gw_be;
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WriteBE32(&ip_be, ip);
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WriteBE32(&gw_be, gw);
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AddRoute(AF_INET, &ip_be, cidr, &gw_be);
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}
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static void AddOrRemoveRoute(const RouteInfo &cd, bool remove) {
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char buf1[kSizeOfAddress], buf2[kSizeOfAddress];
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print_ip_prefix(buf1, cd.family, cd.ip, cd.cidr);
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print_ip_prefix(buf2, cd.family, cd.gw, -1);
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#if defined(OS_LINUX)
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const char *cmd = remove ? "delete" : "add";
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if (cd.family == AF_INET) {
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RunCommand("/sbin/route %s -net %s gw %s", cmd, buf1, buf2);
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} else {
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RunCommand("/sbin/route %s -net inet6 %s gw %s", cmd, buf1, buf2);
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}
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#elif defined(OS_MACOSX) || defined(OS_FREEBSD)
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const char *cmd = remove ? "delete" : "add";
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if (cd.family == AF_INET) {
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RunCommand("/sbin/route -q %s %s %s", cmd, buf1, buf2);
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} else {
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RunCommand("/sbin/route -q %s -inet6 %s %s", cmd, buf1, buf2);
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}
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#endif
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}
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bool TunsafeBackendBsd::AddRoute(int family, const void *dest, int dest_prefix, const void *gateway) {
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RouteInfo c;
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c.family = family;
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size_t len = (family == AF_INET) ? 4 : 16;
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memcpy(c.ip, dest, len);
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memcpy(c.gw, gateway, len);
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c.cidr = dest_prefix;
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cleanup_commands_.push_back(c);
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AddOrRemoveRoute(c, false);
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return true;
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}
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void TunsafeBackendBsd::DelRoute(const RouteInfo &cd) {
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AddOrRemoveRoute(cd, true);
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}
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static bool IsIpv6AddressSet(const void *p) {
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return (ReadLE64(p) | ReadLE64((char*)p + 8)) != 0;
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}
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// Called to initialize tun
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bool TunsafeBackendBsd::Initialize(const TunConfig &&config, TunConfigOut *out) override {
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char def_iface[12];
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char devname[16];
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if (!RunPrePostCommand(config.pre_post_commands.pre_up)) {
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RERROR("Pre command failed!");
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return false;
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}
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out->enable_neighbor_discovery_spoofing = false;
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if (!InitializeTun(devname))
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return false;
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if (config.ipv6_cidr)
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RERROR("IPv6 not supported");
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uint32 netmask = CidrToNetmaskV4(config.cidr);
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uint32 default_route_v4 = ComputeIpv4DefaultRoute(config.ip, netmask);
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RunCommand("/sbin/ifconfig %s %A mtu %d %A netmask %A up", devname, config.ip, config.mtu, config.ip, netmask);
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AddRoute(config.ip & netmask, config.cidr, config.ip);
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if (config.use_ipv4_default_route) {
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if (config.default_route_endpoint_v4) {
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uint32 gw;
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if (!GetDefaultRoute(def_iface, sizeof(def_iface), &gw)) {
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RERROR("Unable to determine default interface.");
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return false;
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}
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AddRoute(config.default_route_endpoint_v4, 32, gw);
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}
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AddRoute(0x00000000, 1, default_route_v4);
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AddRoute(0x80000000, 1, default_route_v4);
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}
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uint8 default_route_v6[16];
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if (config.ipv6_cidr) {
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static const uint8 matchall_1_route[17] = {0x80, 0, 0, 0};
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char buf[kSizeOfAddress];
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ComputeIpv6DefaultRoute(config.ipv6_address, config.ipv6_cidr, default_route_v6);
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RunCommand("/sbin/ifconfig %s inet6 %s", devname, print_ip_prefix(buf, AF_INET6, config.ipv6_address, config.ipv6_cidr));
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if (config.use_ipv6_default_route) {
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if (IsIpv6AddressSet(config.default_route_endpoint_v6)) {
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RERROR("default_route_endpoint_v6 not supported");
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}
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AddRoute(AF_INET6, matchall_1_route + 1, 1, default_route_v6);
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AddRoute(AF_INET6, matchall_1_route + 0, 1, default_route_v6);
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}
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}
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// Add all the extra routes
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for (auto it = config.extra_routes.begin(); it != config.extra_routes.end(); ++it) {
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if (it->size == 32) {
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AddRoute(ReadBE32(it->addr), it->cidr, default_route_v4);
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} else if (it->size == 128 && config.ipv6_cidr) {
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AddRoute(AF_INET6, it->addr, it->cidr, default_route_v6);
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}
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}
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RunPrePostCommand(config.pre_post_commands.post_up);
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pre_down_ = std::move(config.pre_post_commands.pre_down);
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post_down_ = std::move(config.pre_post_commands.post_down);
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return true;
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}
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void TunsafeBackendBsd::CleanupRoutes() {
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RunPrePostCommand(pre_down_);
|
|
|
|
for(auto it = cleanup_commands_.begin(); it != cleanup_commands_.end(); ++it)
|
|
DelRoute(*it);
|
|
cleanup_commands_.clear();
|
|
|
|
RunPrePostCommand(post_down_);
|
|
|
|
pre_down_.clear();
|
|
post_down_.clear();
|
|
}
|
|
|
|
static bool RunOneCommand(const std::string &cmd) {
|
|
RINFO("Run: %s", cmd.c_str());
|
|
int exit_code = system(cmd.c_str());
|
|
if (exit_code) {
|
|
RERROR("Run Failed (%d) : %s", exit_code, cmd.c_str());
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool TunsafeBackendBsd::RunPrePostCommand(const std::vector<std::string> &vec) {
|
|
bool success = true;
|
|
for (auto it = vec.begin(); it != vec.end(); ++it) {
|
|
success &= RunOneCommand(*it);
|
|
}
|
|
return success;
|
|
}
|
|
|
|
static TunsafeBackendBsd *g_tunsafe_backend_bsd;
|
|
|
|
static void SigAlrm(int sig) {
|
|
if (g_tunsafe_backend_bsd)
|
|
g_tunsafe_backend_bsd->HandleSigAlrm();
|
|
}
|
|
|
|
static void SigUsr1(int sig) {
|
|
|
|
}
|
|
|
|
static bool did_ctrlc;
|
|
|
|
void SigInt(int sig) {
|
|
if (did_ctrlc)
|
|
exit(1);
|
|
did_ctrlc = true;
|
|
write(1, "Ctrl-C detected. Exiting. Press again to force quit.\n", sizeof("Ctrl-C detected. Exiting. Press again to force quit.\n")-1);
|
|
|
|
if (g_tunsafe_backend_bsd)
|
|
g_tunsafe_backend_bsd->HandleExit();
|
|
}
|
|
|
|
void TunsafeBackendBsd::RunLoop() {
|
|
assert(!g_tunsafe_backend_bsd);
|
|
assert(processor_);
|
|
|
|
g_tunsafe_backend_bsd = this;
|
|
// We want an alarm signal every second.
|
|
{
|
|
struct sigaction act = {0};
|
|
act.sa_handler = SigAlrm;
|
|
if (sigaction(SIGALRM, &act, NULL) < 0) {
|
|
RERROR("Unable to install SIGALRM handler.");
|
|
return;
|
|
}
|
|
}
|
|
|
|
{
|
|
struct sigaction act = {0};
|
|
act.sa_handler = SigInt;
|
|
if (sigaction(SIGINT, &act, NULL) < 0) {
|
|
RERROR("Unable to install SIGINT handler.");
|
|
return;
|
|
}
|
|
}
|
|
|
|
{
|
|
struct sigaction act = {0};
|
|
act.sa_handler = SigUsr1;
|
|
if (sigaction(SIGUSR1, &act, NULL) < 0) {
|
|
RERROR("Unable to install SIGUSR1 handler.");
|
|
return;
|
|
}
|
|
}
|
|
|
|
#if defined(OS_LINUX) || defined(OS_FREEBSD)
|
|
{
|
|
struct itimerspec tv = {0};
|
|
struct sigevent sev;
|
|
timer_t timer_id;
|
|
|
|
tv.it_interval.tv_sec = 1;
|
|
tv.it_value.tv_sec = 1;
|
|
|
|
sev.sigev_notify = SIGEV_SIGNAL;
|
|
sev.sigev_signo = SIGALRM;
|
|
sev.sigev_value.sival_ptr = NULL;
|
|
|
|
if (timer_create(CLOCK_MONOTONIC, &sev, &timer_id) < 0) {
|
|
RERROR("timer_create failed");
|
|
return;
|
|
}
|
|
|
|
if (timer_settime(timer_id, 0, &tv, NULL) < 0) {
|
|
RERROR("timer_settime failed");
|
|
return;
|
|
}
|
|
}
|
|
#elif defined(OS_MACOSX)
|
|
ualarm(1000000, 1000000);
|
|
#endif
|
|
|
|
RunLoopInner();
|
|
|
|
g_tunsafe_backend_bsd = NULL;
|
|
}
|
|
|
|
void InitCpuFeatures();
|
|
void Benchmark();
|
|
|
|
|
|
uint32 g_ui_ip;
|
|
|
|
const char *print_ip(char buf[kSizeOfAddress], in_addr_t ip) {
|
|
snprintf(buf, kSizeOfAddress, "%d.%d.%d.%d", (ip >> 24) & 0xff, (ip >> 16) & 0xff, (ip >> 8) & 0xff, (ip >> 0) & 0xff);
|
|
return buf;
|
|
}
|
|
|
|
|
|
class MyProcessorDelegate : public ProcessorDelegate {
|
|
public:
|
|
virtual void OnConnected(in_addr_t my_ip) {
|
|
if (my_ip != g_ui_ip) {
|
|
if (my_ip) {
|
|
char buf[kSizeOfAddress];
|
|
print_ip(buf, my_ip);
|
|
RINFO("Connection established. IP %s", buf);
|
|
}
|
|
g_ui_ip = my_ip;
|
|
}
|
|
}
|
|
virtual void OnDisconnected() {
|
|
MyProcessorDelegate::OnConnected(0);
|
|
}
|
|
};
|
|
|
|
int main(int argc, char **argv) {
|
|
bool exit_flag = false;
|
|
|
|
InitCpuFeatures();
|
|
|
|
if (argc == 2 && strcmp(argv[1], "--benchmark") == 0) {
|
|
Benchmark();
|
|
return 0;
|
|
}
|
|
|
|
fprintf(stderr, "%s\n", TUNSAFE_VERSION_STRING);
|
|
|
|
if (argc < 2) {
|
|
fprintf(stderr, "Syntax: tunsafe file.conf\n");
|
|
return 1;
|
|
}
|
|
|
|
#if defined(OS_MACOSX)
|
|
InitOsxGetMilliseconds();
|
|
#endif
|
|
|
|
SetThreadName("tunsafe-m");
|
|
|
|
MyProcessorDelegate my_procdel;
|
|
TunsafeBackendBsd *socket_loop = CreateTunsafeBackendBsd();
|
|
WireguardProcessor wg(socket_loop, socket_loop, &my_procdel);
|
|
socket_loop->SetProcessor(&wg);
|
|
|
|
if (!ParseWireGuardConfigFile(&wg, argv[1], &exit_flag)) return 1;
|
|
if (!wg.Start()) return 1;
|
|
|
|
socket_loop->RunLoop();
|
|
socket_loop->CleanupRoutes();
|
|
delete socket_loop;
|
|
|
|
return 0;
|
|
}
|