474 lines
9.7 KiB
C
474 lines
9.7 KiB
C
#include "common.h"
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#include "buffer.h"
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#include "ip.h"
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#include "str.h"
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#include "option.h"
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#include "tun.h"
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#include "db.h"
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#include "state.h"
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#include <inttypes.h>
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#include <limits.h>
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#include <stdio.h>
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#include <signal.h>
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#include <poll.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "mud.h"
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#ifndef O_CLOEXEC
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#define O_CLOEXEC 0
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#endif
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static struct {
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volatile sig_atomic_t quit;
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volatile sig_atomic_t info;
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int timeout;
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int state_fd;
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} gt;
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static void fd_set_nonblock (int fd)
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{
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int ret;
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do {
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ret = fcntl(fd, F_GETFL, 0);
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} while (ret==-1 && errno==EINTR);
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int flags = (ret==-1)?0:ret;
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do {
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ret = fcntl(fd, F_SETFL, flags|O_NONBLOCK);
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} while (ret==-1 && errno==EINTR);
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if (ret==-1)
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perror("fcntl O_NONBLOCK");
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}
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static void gt_sa_handler (int sig)
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{
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switch (sig) {
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case SIGINT:
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case SIGQUIT:
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case SIGTERM:
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gt.quit = 1;
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break;
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case SIGUSR1:
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gt.info = 1;
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break;
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}
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}
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static void gt_set_signal (void)
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{
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struct sigaction sa = {
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.sa_flags = 0,
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};
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = gt_sa_handler;
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGQUIT, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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sigaction(SIGUSR1, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGHUP, &sa, NULL);
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sigaction(SIGPIPE, &sa, NULL);
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}
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static ssize_t fd_read (int fd, void *data, size_t size)
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{
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if ((fd==-1) || !size)
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return -1;
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ssize_t ret = read(fd, data, size);
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if (ret==-1) {
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if (errno==EAGAIN || errno==EINTR)
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return -1;
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if (errno)
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perror("read");
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return 0;
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}
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return ret;
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}
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static ssize_t fd_write (int fd, const void *data, size_t size)
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{
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if ((fd==-1) || !size)
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return -1;
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ssize_t ret = write(fd, data, size);
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if (ret==-1) {
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if (errno==EAGAIN || errno==EINTR)
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return -1;
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if (errno==EPIPE || errno==ECONNRESET)
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return 0;
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if (errno)
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perror("write");
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return 0;
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}
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return ret;
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}
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static size_t fd_read_all (int fd, void *data, size_t size)
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{
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size_t done = 0;
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while (done<size) {
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ssize_t ret = fd_read(fd, (uint8_t *)data+done, size-done);
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if (!ret)
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break;
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if (ret<0) {
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struct pollfd pollfd = {
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.fd = fd,
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.events = POLLIN,
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};
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if (!poll(&pollfd, 1, gt.timeout))
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break;
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continue;
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}
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done += ret;
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}
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return done;
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}
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static size_t fd_write_all (int fd, const void *data, size_t size)
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{
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size_t done = 0;
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while (done<size) {
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ssize_t ret = fd_write(fd, (const uint8_t *)data+done, size-done);
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if (!ret)
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break;
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if (ret<0) {
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struct pollfd pollfd = {
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.fd = fd,
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.events = POLLOUT,
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};
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if (!poll(&pollfd, 1, gt.timeout))
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break;
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continue;
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}
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done += ret;
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}
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return done;
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}
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static int gt_setup_secretkey (struct mud *mud, char *keyfile)
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{
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unsigned char key[32];
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if (str_empty(keyfile)) {
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char buf[2*sizeof(key)+1];
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size_t size = sizeof(key);
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if (mud_get_key(mud, key, &size))
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return -1;
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gt_tohex(buf, sizeof(buf), key, size);
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state_send(gt.state_fd, "SECRETKEY", buf);
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return 0;
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}
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int fd;
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do {
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fd = open(keyfile, O_RDONLY|O_CLOEXEC);
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} while (fd==-1 && errno==EINTR);
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if (fd==-1) {
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perror("open keyfile");
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return -1;
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}
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char buf[2*sizeof(key)];
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size_t r = fd_read_all(fd, buf, sizeof(buf));
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close(fd);
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if (r!=sizeof(buf)) {
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gt_log("unable to read secret key\n");
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return -1;
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}
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if (gt_fromhex(key, sizeof(key), buf, sizeof(buf))) {
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gt_log("secret key is not valid\n");
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return -1;
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}
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mud_set_key(mud, key, sizeof(key));
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return 0;
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}
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int main (int argc, char **argv)
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{
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gt_set_signal();
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char *host = NULL;
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long port = 5000;
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char *bind_list = NULL;
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long bind_port = 5000;
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char *dev = NULL;
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char *keyfile = NULL;
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char *statefile = NULL;
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long mtu = 1450;
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gt.timeout = 5000;
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long time_tolerance = 0;
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int v4 = 1;
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int v6 = 1;
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struct option opts[] = {
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{ "host", &host, option_str },
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{ "port", &port, option_long },
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{ "bind", &bind_list, option_str },
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{ "bind-port", &bind_port, option_long },
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{ "dev", &dev, option_str },
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{ "mtu", &mtu, option_long },
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{ "keyfile", &keyfile, option_str },
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{ "multiqueue", NULL, option_option },
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{ "statefile", &statefile, option_str },
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{ "timeout", >.timeout, option_long },
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{ "time-tolerance", &time_tolerance, option_long },
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{ "v4only", NULL, option_option },
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{ "v6only", NULL, option_option },
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{ "version", NULL, option_option },
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{ NULL },
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};
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if (option(opts, argc, argv))
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return 1;
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if (option_is_set(opts, "version")) {
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gt_print(PACKAGE_STRING"\n");
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return 0;
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}
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if (option_is_set(opts, "v4only"))
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v6 = 0;
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if (option_is_set(opts, "v6only"))
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v4 = 0;
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if (!v4 && !v6) {
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gt_log("v4only and v6only are both set\n");
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return 1;
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}
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if (host && !option_is_set(opts, "keyfile")) {
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gt_log("keyfile option must be set\n");
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return 1;
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}
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if (gt.timeout<=0 || gt.timeout>INT_MAX) {
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gt_log("bad timeout\n");
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return 1;
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}
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gt.state_fd = state_create(statefile);
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if (statefile && gt.state_fd==-1)
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return 1;
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char *tun_name = NULL;
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int tun_fd = tun_create(dev, &tun_name, option_is_set(opts, "multiqueue"));
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if (tun_fd==-1) {
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gt_log("couldn't create tun device\n");
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return 1;
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}
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fd_set_nonblock(tun_fd);
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struct mud *mud = mud_create(bind_port, v4, v6);
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if (!mud) {
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gt_log("couldn't create mud\n");
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return 1;
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}
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if (gt_setup_secretkey(mud, keyfile))
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return 1;
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mud_set_send_timeout_msec(mud, gt.timeout);
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if (time_tolerance > 0)
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mud_set_time_tolerance_sec(mud, time_tolerance);
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if (host && port && bind_list) {
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char tmp[1024];
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char *name = &tmp[0];
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size_t size = str_cpy(tmp, bind_list, sizeof(tmp)-1);
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for (size_t i=0; i<size; i++) {
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if (tmp[i]!=',')
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continue;
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tmp[i] = 0;
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if (mud_peer(mud, name, host, port))
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return 1;
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name = &tmp[i+1];
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}
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if (name[0] && mud_peer(mud, name, host, port))
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return 1;
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}
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int mud_fd = mud_get_fd(mud);
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state_send(gt.state_fd, "INITIALIZED", tun_name);
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fd_set rfds;
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FD_ZERO(&rfds);
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int started = 0;
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struct {
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unsigned char *buf;
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} send, recv;
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send.buf = malloc(2*mtu);
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recv.buf = malloc(mtu);
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size_t send_size = 0;
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size_t send_limit = 0;
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while (!gt.quit) {
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FD_SET(tun_fd, &rfds);
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if (mud_can_pull(mud)) {
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FD_SET(mud_fd, &rfds);
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} else {
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FD_CLR(mud_fd, &rfds);
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}
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struct timeval timeout = {
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.tv_usec = 100000,
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};
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if (mud_can_push(mud) || send_size)
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timeout.tv_usec = 1000;
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if _0_(select(mud_fd+1, &rfds, NULL, NULL, &timeout)==-1) {
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if (errno==EINTR)
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continue;
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perror("select");
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return 1;
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}
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if (mud_is_up(mud)) {
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if (!started) {
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state_send(gt.state_fd, "STARTED", tun_name);
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started = 1;
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}
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} else {
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if (started) {
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state_send(gt.state_fd, "STOPPED", tun_name);
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started = 0;
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}
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}
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if (FD_ISSET(tun_fd, &rfds)) {
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while (send_size<mtu) {
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const ssize_t r = tun_read(tun_fd, send.buf+send_size, mtu);
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if (r<=0) {
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gt.quit |= !r;
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break;
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}
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struct ip_common ic;
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if (ip_get_common(&ic, send.buf+send_size, mtu) || ic.size!=r) {
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gt_log("packet dropped: malformed\n");
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continue;
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}
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send_size += r;
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if (send_size<=mtu)
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send_limit = send_size;
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}
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}
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if (send_limit && mud_send(mud, send.buf, send_limit)==send_limit) {
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if (send_size>send_limit)
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memmove(&send.buf[0], &send.buf[send_limit], send_size-send_limit);
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send_size -= send_limit;
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send_limit = send_size;
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}
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mud_push(mud);
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if (FD_ISSET(mud_fd, &rfds))
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mud_pull(mud);
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while (!gt.quit) {
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const int size = mud_recv(mud, recv.buf, mtu);
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if (size<=0)
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break;
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int p = 0;
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while (p<size) {
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struct ip_common ic;
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if (ip_get_common(&ic, recv.buf+p, size-p) || ic.size>size-p)
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break;
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const ssize_t r = tun_write(tun_fd, recv.buf+p, ic.size);
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if (r<=0) {
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gt.quit |= !r;
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break;
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}
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p += ic.size;
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}
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}
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}
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return 0;
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}
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