+ host = *(u_int32_t *)(hent->h_addr_list[0]);
+ }
+ *sep = ':';
+
+ /* get a socket and connect it to the other end */
+ sock = socket(PF_INET, SOCK_STREAM, 0);
+ if (sock < 0) {
+ error("Can't create socket: %m");
+ return -1;
+ }
+ memset(&sad, 0, sizeof(sad));
+ sad.sin_family = AF_INET;
+ sad.sin_port = htons(port);
+ sad.sin_addr.s_addr = host;
+ if (connect(sock, (struct sockaddr *)&sad, sizeof(sad)) < 0) {
+ error("Can't connect to %s: %m", dest);
+ close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+
+/*
+ * start_charshunt - create a child process to run the character shunt.
+ */
+static int
+start_charshunt(ifd, ofd)
+ int ifd, ofd;
+{
+ int cpid;
+
+ cpid = fork();
+ if (cpid == -1) {
+ error("Can't fork process for character shunt: %m");
+ return 0;
+ }
+ if (cpid == 0) {
+ /* child */
+ close(pty_slave);
+ setuid(uid);
+ if (getuid() != uid)
+ fatal("setuid failed");
+ setgid(getgid());
+ if (!nodetach)
+ log_to_fd = -1;
+ charshunt(ifd, ofd, record_file);
+ exit(0);
+ }
+ charshunt_pid = cpid;
+ close(pty_master);
+ pty_master = -1;
+ ttyfd = pty_slave;
+ record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
+ return 1;
+}
+
+static void
+charshunt_done(arg)
+ void *arg;
+{
+ charshunt_pid = 0;
+}
+
+/*
+ * charshunt - the character shunt, which passes characters between
+ * the pty master side and the serial port (or stdin/stdout).
+ * This runs as the user (not as root).
+ * (We assume ofd >= ifd which is true the way this gets called. :-).
+ */
+static void
+charshunt(ifd, ofd, record_file)
+ int ifd, ofd;
+ char *record_file;
+{
+ int n, nfds;
+ fd_set ready, writey;
+ u_char *ibufp, *obufp;
+ int nibuf, nobuf;
+ int flags;
+ int pty_readable, stdin_readable;
+ struct timeval lasttime;
+ FILE *recordf = NULL;
+ int ilevel, olevel, max_level;
+ struct timeval levelt, tout, *top;
+
+ /*
+ * Reset signal handlers.
+ */
+ signal(SIGHUP, SIG_IGN); /* Hangup */
+ signal(SIGINT, SIG_DFL); /* Interrupt */
+ signal(SIGTERM, SIG_DFL); /* Terminate */
+ signal(SIGCHLD, SIG_DFL);
+ signal(SIGUSR1, SIG_DFL);
+ signal(SIGUSR2, SIG_DFL);
+ signal(SIGABRT, SIG_DFL);
+ signal(SIGALRM, SIG_DFL);
+ signal(SIGFPE, SIG_DFL);
+ signal(SIGILL, SIG_DFL);
+ signal(SIGPIPE, SIG_DFL);
+ signal(SIGQUIT, SIG_DFL);
+ signal(SIGSEGV, SIG_DFL);
+#ifdef SIGBUS
+ signal(SIGBUS, SIG_DFL);
+#endif
+#ifdef SIGEMT
+ signal(SIGEMT, SIG_DFL);
+#endif
+#ifdef SIGPOLL
+ signal(SIGPOLL, SIG_DFL);
+#endif
+#ifdef SIGPROF
+ signal(SIGPROF, SIG_DFL);
+#endif
+#ifdef SIGSYS
+ signal(SIGSYS, SIG_DFL);
+#endif
+#ifdef SIGTRAP
+ signal(SIGTRAP, SIG_DFL);
+#endif
+#ifdef SIGVTALRM
+ signal(SIGVTALRM, SIG_DFL);
+#endif
+#ifdef SIGXCPU
+ signal(SIGXCPU, SIG_DFL);
+#endif
+#ifdef SIGXFSZ
+ signal(SIGXFSZ, SIG_DFL);
+#endif
+
+ /*
+ * Open the record file if required.
+ */
+ if (record_file != NULL) {
+ recordf = fopen(record_file, "a");
+ if (recordf == NULL)
+ error("Couldn't create record file %s: %m", record_file);
+ }
+
+ /* set all the fds to non-blocking mode */
+ flags = fcntl(pty_master, F_GETFL);
+ if (flags == -1
+ || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set pty master to nonblock: %m");
+ flags = fcntl(ifd, F_GETFL);
+ if (flags == -1
+ || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty"));
+ if (ofd != ifd) {
+ flags = fcntl(ofd, F_GETFL);
+ if (flags == -1
+ || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set stdout to nonblock: %m");
+ }
+
+ nibuf = nobuf = 0;
+ ibufp = obufp = NULL;
+ pty_readable = stdin_readable = 1;
+
+ ilevel = olevel = 0;
+ gettimeofday(&levelt, NULL);
+ if (max_data_rate) {
+ max_level = max_data_rate / 10;
+ if (max_level < 100)
+ max_level = 100;
+ } else
+ max_level = sizeof(inpacket_buf) + 1;
+
+ nfds = (ofd > pty_master? ofd: pty_master) + 1;
+ if (recordf != NULL) {
+ gettimeofday(&lasttime, NULL);
+ putc(7, recordf); /* put start marker */
+ putc(lasttime.tv_sec >> 24, recordf);
+ putc(lasttime.tv_sec >> 16, recordf);
+ putc(lasttime.tv_sec >> 8, recordf);
+ putc(lasttime.tv_sec, recordf);
+ lasttime.tv_usec = 0;
+ }
+
+ while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) {
+ top = 0;
+ tout.tv_sec = 0;
+ tout.tv_usec = 10000;
+ FD_ZERO(&ready);
+ FD_ZERO(&writey);
+ if (nibuf != 0) {
+ if (ilevel >= max_level)
+ top = &tout;
+ else
+ FD_SET(pty_master, &writey);
+ } else if (stdin_readable)
+ FD_SET(ifd, &ready);
+ if (nobuf != 0) {
+ if (olevel >= max_level)
+ top = &tout;
+ else
+ FD_SET(ofd, &writey);
+ } else if (pty_readable)
+ FD_SET(pty_master, &ready);
+ if (select(nfds, &ready, &writey, NULL, top) < 0) {
+ if (errno != EINTR)
+ fatal("select");
+ continue;