453 lines
10 KiB
C
453 lines
10 KiB
C
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/*-
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* Copyright (c) 1990, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1990, 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)startslip.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#include <sys/param.h>
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#if BSD >= 199006
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#define POSIX
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#endif
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#ifdef POSIX
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#include <sys/termios.h>
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#include <sys/ioctl.h>
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#else
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#include <sgtty.h>
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#endif
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <net/if_slvar.h>
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#include <netdb.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <signal.h>
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#define DEFAULT_BAUD B9600
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int speed = DEFAULT_BAUD;
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#define FC_NONE 0 /* flow control: none */
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#define FC_SW 1 /* flow control: software (XON/XOFF) */
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#define FC_HW 2 /* flow control: hardware (RTS/CTS) */
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int flowcontrol = FC_NONE;
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char *annex;
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int hup;
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int logged_in;
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int wait_time = 60; /* then back off */
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#define MAXTRIES 6 /* w/60 sec and doubling, takes an hour */
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#define PIDFILE "/var/run/startslip.pid"
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#ifdef DEBUG
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int debug = 1;
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#undef LOG_ERR
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#undef LOG_INFO
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#define syslog fprintf
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#define LOG_ERR stderr
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#define LOG_INFO stderr
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#else
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int debug = 0;
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#endif
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#define printd if (debug) printf
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern char *optarg;
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extern int optind;
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char *cp, **ap;
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int ch, disc;
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int fd = -1;
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void sighup();
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FILE *wfd = NULL, *pfd;
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char *dialerstring = 0, buf[BUFSIZ];
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int first = 1, tries = 0;
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int pausefirst = 0;
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int pid;
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#ifdef POSIX
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struct termios t;
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#else
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struct sgttyb sgtty;
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#endif
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while ((ch = getopt(argc, argv, "db:s:p:A:F:")) != EOF)
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switch (ch) {
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case 'd':
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debug = 1;
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break;
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#ifdef POSIX
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case 'b':
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speed = atoi(optarg);
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break;
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#endif
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case 'p':
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pausefirst = atoi(optarg);
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break;
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case 's':
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dialerstring = optarg;
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break;
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case 'A':
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annex = optarg;
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break;
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case 'F':
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#ifdef POSIX
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if (strcmp(optarg, "none") == 0)
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flowcontrol = FC_NONE;
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else if (strcmp(optarg, "sw") == 0)
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flowcontrol = FC_SW;
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else if (strcmp(optarg, "hw") == 0)
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flowcontrol = FC_HW;
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else {
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(void)fprintf(stderr,
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"flow control: none, sw, hw\n");
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exit(1);
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}
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break;
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#else
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(void)fprintf(stderr, "flow control not supported\n");
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exit(1);
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#endif
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 3)
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usage();
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openlog("startslip", LOG_PID, LOG_DAEMON);
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#if BSD <= 43
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if (debug == 0 && (fd = open("/dev/tty", 0)) >= 0) {
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ioctl(fd, TIOCNOTTY, 0);
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close(fd);
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fd = -1;
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}
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#endif
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if (debug)
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setbuf(stdout, NULL);
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if (pfd = fopen(PIDFILE, "r")) {
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pid = 0;
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fscanf(pfd, "%d", &pid);
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if (pid > 0)
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kill(pid, SIGUSR1);
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fclose(pfd);
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}
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restart:
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logged_in = 0;
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if (++tries > MAXTRIES) {
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syslog(LOG_ERR, "exiting after %d tries\n", tries);
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/* ???
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if (first)
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*/
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exit(1);
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}
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/*
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* We may get a HUP below, when the parent (session leader/
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* controlling process) exits; ignore HUP until into new session.
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*/
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signal(SIGHUP, SIG_IGN);
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hup = 0;
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if (fork() > 0) {
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if (pausefirst)
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sleep(pausefirst);
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if (first)
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printd("parent exit\n");
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exit(0);
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}
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pausefirst = 0;
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#ifdef POSIX
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if (setsid() == -1)
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perror("setsid");
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#endif
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pid = getpid();
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printd("restart: pid %d: ", pid);
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if (pfd = fopen(PIDFILE, "w")) {
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fprintf(pfd, "%d\n", pid);
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fclose(pfd);
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}
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if (wfd) {
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printd("fclose, ");
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fclose(wfd);
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wfd == NULL;
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}
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if (fd >= 0) {
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printd("close, ");
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close(fd);
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sleep(5);
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}
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printd("open");
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if ((fd = open(argv[0], O_RDWR)) < 0) {
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perror(argv[0]);
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syslog(LOG_ERR, "open %s: %m\n", argv[0]);
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if (first)
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exit(1);
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else {
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sleep(wait_time * tries);
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goto restart;
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}
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}
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printd(" %d", fd);
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#ifdef TIOCSCTTY
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if (ioctl(fd, TIOCSCTTY, 0) < 0)
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perror("ioctl (TIOCSCTTY)");
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#endif
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signal(SIGHUP, sighup);
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if (debug) {
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if (ioctl(fd, TIOCGETD, &disc) < 0)
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perror("ioctl(TIOCSETD)");
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printf(" (disc was %d)", disc);
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}
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disc = TTYDISC;
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if (ioctl(fd, TIOCSETD, &disc) < 0) {
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perror("ioctl(TIOCSETD)");
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syslog(LOG_ERR, "%s: ioctl (TIOCSETD 0): %m\n",
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argv[0]);
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}
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printd(", ioctl");
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#ifdef POSIX
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if (tcgetattr(fd, &t) < 0) {
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perror("tcgetattr");
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syslog(LOG_ERR, "%s: tcgetattr: %m\n", argv[0]);
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exit(2);
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}
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cfmakeraw(&t);
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t.c_iflag &= ~IMAXBEL;
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switch (flowcontrol) {
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case FC_HW:
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t.c_cflag |= (CRTS_IFLOW|CCTS_OFLOW);
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break;
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case FC_SW:
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t.c_iflag |= (IXON|IXOFF);
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break;
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case FC_NONE:
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t.c_cflag &= ~(CRTS_IFLOW|CCTS_OFLOW);
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t.c_iflag &= ~(IXON|IXOFF);
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break;
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}
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cfsetspeed(&t, speed);
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if (tcsetattr(fd, TCSAFLUSH, &t) < 0) {
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perror("tcsetattr");
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syslog(LOG_ERR, "%s: tcsetattr: %m\n", argv[0]);
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if (first)
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exit(2);
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else {
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sleep(wait_time * tries);
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goto restart;
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}
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}
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#else
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if (ioctl(fd, TIOCGETP, &sgtty) < 0) {
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perror("ioctl (TIOCGETP)");
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syslog(LOG_ERR, "%s: ioctl (TIOCGETP): %m\n",
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argv[0]);
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exit(2);
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}
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sgtty.sg_flags = RAW | ANYP;
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sgtty.sg_erase = sgtty.sg_kill = 0377;
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sgtty.sg_ispeed = sgtty.sg_ospeed = speed;
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if (ioctl(fd, TIOCSETP, &sgtty) < 0) {
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perror("ioctl (TIOCSETP)");
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syslog(LOG_ERR, "%s: ioctl (TIOCSETP): %m\n",
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argv[0]);
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if (first)
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exit(2);
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else {
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sleep(wait_time * tries);
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goto restart;
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}
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}
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#endif
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sleep(2); /* wait for flakey line to settle */
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if (hup)
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goto restart;
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wfd = fdopen(fd, "w+");
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if (wfd == NULL) {
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syslog(LOG_ERR, "can't fdopen slip line\n");
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exit(10);
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}
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setbuf(wfd, (char *)0);
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if (dialerstring) {
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printd(", send dialstring");
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fprintf(wfd, "%s\r", dialerstring);
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} else
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putc('\r', wfd);
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printd("\n");
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/*
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* Log in
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*/
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printd("look for login: ");
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for (;;) {
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if (getline(buf, BUFSIZ, fd) == 0 || hup) {
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sleep(wait_time * tries);
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goto restart;
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}
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if (annex) {
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if (bcmp(buf, annex, strlen(annex)) == 0) {
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fprintf(wfd, "slip\r");
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printd("Sent \"slip\"\n");
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continue;
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}
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if (bcmp(&buf[1], "sername:", 8) == 0) {
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fprintf(wfd, "%s\r", argv[1]);
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printd("Sent login: %s\n", argv[1]);
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continue;
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}
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if (bcmp(&buf[1], "assword:", 8) == 0) {
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fprintf(wfd, "%s\r", argv[2]);
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printd("Sent password: %s\n", argv[2]);
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break;
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}
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} else {
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if (bcmp(&buf[1], "ogin:", 5) == 0) {
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fprintf(wfd, "%s\r", argv[1]);
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printd("Sent login: %s\n", argv[1]);
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continue;
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}
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if (bcmp(&buf[1], "assword:", 8) == 0) {
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fprintf(wfd, "%s\r", argv[2]);
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printd("Sent password: %s\n", argv[2]);
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break;
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}
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}
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}
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/*
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* Security hack. Do not want private information such as the
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* password and possible phone number to be left around.
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* So we clobber the arguments.
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*/
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for (ap = argv - optind + 1; ap < argv + 3; ap++)
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for (cp = *ap; *cp != 0; cp++)
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*cp = '\0';
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/*
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* Attach
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*/
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printd("setd");
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disc = SLIPDISC;
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if (ioctl(fd, TIOCSETD, &disc) < 0) {
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perror("ioctl(TIOCSETD)");
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syslog(LOG_ERR, "%s: ioctl (TIOCSETD SLIP): %m\n",
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argv[0]);
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exit(1);
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}
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if (first && debug == 0) {
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close(0);
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close(1);
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close(2);
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(void) open("/dev/null", O_RDWR);
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(void) dup2(0, 1);
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(void) dup2(0, 2);
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}
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(void) system("ifconfig sl0 up");
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printd(", ready\n");
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if (!first)
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syslog(LOG_INFO, "reconnected (%d tries).\n", tries);
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first = 0;
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tries = 0;
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logged_in = 1;
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while (hup == 0) {
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sigpause(0L);
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printd("sigpause return\n");
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}
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goto restart;
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}
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void
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sighup()
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{
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printd("hup\n");
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if (hup == 0 && logged_in)
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syslog(LOG_INFO, "hangup signal\n");
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hup = 1;
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}
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getline(buf, size, fd)
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char *buf;
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int size, fd;
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{
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register int i;
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int ret;
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size--;
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for (i = 0; i < size; i++) {
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if (hup)
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return (0);
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if ((ret = read(fd, &buf[i], 1)) == 1) {
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buf[i] &= 0177;
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if (buf[i] == '\r' || buf[i] == '\0')
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buf[i] = '\n';
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if (buf[i] != '\n' && buf[i] != ':')
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continue;
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buf[i + 1] = '\0';
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printd("Got %d: \"%s\"\n", i + 1, buf);
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return (i+1);
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}
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if (ret <= 0) {
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if (ret < 0)
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perror("getline: read");
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else
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fprintf(stderr, "read returned 0\n");
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buf[i] = '\0';
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printd("returning 0 after %d: \"%s\"\n", i, buf);
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return (0);
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}
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}
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return (0);
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}
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usage()
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{
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(void)fprintf(stderr,
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"usage: startslip [-d] [-b speed] [-s string] [-A annexname] [-F flowcontrol] dev user passwd\n");
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exit(1);
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}
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