575 lines
13 KiB
C
575 lines
13 KiB
C
/*-
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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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* $Id: startslip.c,v 1.15 1995/09/18 14:01:11 ache Exp $
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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 <termios.h>
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#include <time.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <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 <net/slip.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 <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <paths.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_HW 1 /* flow control: hardware (RTS/CTS) */
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int flowcontrol = FC_NONE;
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int modem_control = 1; /* !CLOCAL+HUPCL iff we watch carrier. */
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int sl_unit = -1;
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char *annex;
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int hup;
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int terminate;
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int locked;
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int logged_in = 0;
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int wait_time = 60; /* then back off */
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int script_timeout = 90; /* connect script default timeout */
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int MAXTRIES = 6; /* w/60 sec and doubling, takes an hour */
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#define PIDFILE "%sstartslip.%s.pid"
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#define MAXDIALS 20
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char *dials[MAXDIALS];
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int diali, dialc;
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int fd = -1;
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FILE *pfd;
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char *dvname, *devicename;
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char pidfile[80];
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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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void sighup(), sigterm(), sigurg();
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FILE *wfd = NULL;
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char *dialerstring = 0, buf[BUFSIZ];
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int unitnum, keepal = 0, outfill = 0;
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char unitname[32];
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char *username, *password;
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char *upscript = NULL, *downscript = NULL;
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int first = 1, tries = 0;
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time_t fintimeout;
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pid_t pid;
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struct termios t;
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while ((ch = getopt(argc, argv, "dhlb:s:t:w:A:U:D:W:K:O:S:")) != 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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case 'b':
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speed = atoi(optarg);
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break;
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case 's':
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if (diali >= MAXDIALS) {
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(void)fprintf(stderr,
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"max dial strings number (%d) exceeded\n", MAXDIALS);
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exit(1);
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}
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dials[diali++] = strdup(optarg);
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break;
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case 't':
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script_timeout = atoi(optarg);
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break;
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case 'w':
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wait_time = atoi(optarg);
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break;
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case 'W':
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MAXTRIES = atoi(optarg);
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break;
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case 'A':
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annex = strdup(optarg);
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break;
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case 'U':
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upscript = strdup(optarg);
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break;
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case 'D':
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downscript = strdup(optarg);
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break;
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case 'l':
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modem_control = 0;
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break;
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case 'h':
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flowcontrol = FC_HW;
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break;
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case 'K':
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keepal = atoi(optarg);
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break;
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case 'O':
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outfill = atoi(optarg);
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break;
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case 'S':
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sl_unit = atoi(optarg);
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break;
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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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/*
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* Copy these so they exist after we clobber them.
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*/
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devicename = strdup(argv[0]);
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username = strdup(argv[1]);
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password = strdup(argv[2]);
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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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openlog("startslip", LOG_PID|LOG_PERROR, LOG_DAEMON);
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if (debug)
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setbuf(stdout, NULL);
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signal(SIGTERM, sigterm);
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if ((dvname = strrchr(devicename, '/')) == NULL)
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dvname = devicename;
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else
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dvname++;
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sprintf(pidfile, PIDFILE, _PATH_VARRUN, dvname);
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if ((pfd = fopen(pidfile, "r")) != NULL) {
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pid = 0;
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fscanf(pfd, "%ld\n", &pid);
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if (pid > 0)
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kill(pid, SIGTERM);
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fclose(pfd);
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pfd = NULL; /* not remove pidfile yet */
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sleep(5); /* allow down script to be completed */
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} else
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restart:
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signal(SIGHUP, SIG_IGN);
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signal(SIGURG, SIG_IGN);
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hup = 0;
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if (logged_in) {
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sprintf(buf, "LINE=%d %s %s down",
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diali ? (dialc - 1) % diali : 0,
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downscript ? downscript : "/sbin/ifconfig" , unitname);
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(void) system(buf);
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logged_in = 0;
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}
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if (terminate)
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down(0);
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tries++;
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if (MAXTRIES > 0 && tries > MAXTRIES) {
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syslog(LOG_ERR, "exiting login after %d tries\n", tries);
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/* ???
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if (first)
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*/
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down(3);
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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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uu_unlock(dvname);
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locked = 0;
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wfd = NULL;
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fd = -1;
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sleep(5);
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} else if (fd >= 0) {
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printd("close, ");
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close(fd);
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uu_unlock(dvname);
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locked = 0;
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fd = -1;
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sleep(5);
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}
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if (terminate)
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goto restart;
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if (tries > 1) {
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syslog(LOG_INFO, "sleeping %d seconds (%d tries)",
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wait_time * (tries - 1), tries);
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sleep(wait_time * (tries - 1));
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if (terminate)
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goto restart;
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}
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if (daemon(1, debug) < 0) {
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syslog(LOG_ERR, "daemon: %m");
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down(2);
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}
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pid = getpid();
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printd("restart: pid %ld: ", pid);
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if ((pfd = fopen(pidfile, "w")) != NULL) {
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fprintf(pfd, "%ld\n", pid);
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fclose(pfd);
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}
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printd("open");
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if (uu_lock(dvname)) {
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syslog(LOG_ERR, "can't lock %s", devicename);
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goto restart;
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}
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locked = 1;
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if ((fd = open(devicename, O_RDWR | O_NONBLOCK)) < 0) {
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syslog(LOG_ERR, "open %s: %m\n", devicename);
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if (first)
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down(1);
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else {
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uu_unlock(dvname);
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locked = 0;
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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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signal(SIGHUP, sighup);
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if (ioctl(fd, TIOCSCTTY, 0) < 0) {
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syslog(LOG_ERR, "ioctl (TIOCSCTTY): %m");
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down(2);
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}
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if (tcsetpgrp(fd, getpid()) < 0) {
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syslog(LOG_ERR, "tcsetpgrp failed: %m");
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down(2);
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}
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printd(", ioctl\n");
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if (tcgetattr(fd, &t) < 0) {
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syslog(LOG_ERR, "%s: tcgetattr: %m\n", devicename);
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down(2);
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}
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cfmakeraw(&t);
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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_NONE:
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t.c_cflag &= ~(CRTS_IFLOW|CCTS_OFLOW);
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break;
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}
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if (modem_control)
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t.c_cflag |= HUPCL;
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else
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t.c_cflag &= ~(HUPCL);
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t.c_cflag |= CLOCAL; /* until modem commands passes */
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cfsetspeed(&t, speed);
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if (tcsetattr(fd, TCSAFLUSH, &t) < 0) {
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syslog(LOG_ERR, "%s: tcsetattr: %m\n", devicename);
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down(2);
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}
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sleep(2); /* wait for flakey line to settle */
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if (hup || terminate)
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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 %s: %m", devicename);
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down(2);
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}
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setbuf(wfd, NULL);
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if (diali > 0)
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dialerstring = dials[dialc++ % diali];
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if (dialerstring) {
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printd("send dialstring: %s\\r", dialerstring);
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fprintf(wfd, "%s\r", dialerstring);
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} else {
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printd("send \\r");
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putc('\r', wfd);
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}
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printd("\n");
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fintimeout = time(NULL) + script_timeout;
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if (modem_control) {
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printd("waiting for carrier\n");
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while (time(NULL) < fintimeout && !carrier()) {
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sleep(1);
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if (hup || terminate)
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goto restart;
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}
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if (!carrier())
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goto restart;
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t.c_cflag &= ~(CLOCAL);
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if (tcsetattr(fd, TCSANOW, &t) < 0) {
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syslog(LOG_ERR, "%s: tcsetattr: %m", devicename);
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down(2);
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}
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/* Only now we able to receive HUP on carier drop! */
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}
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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, fintimeout) == 0 || hup || terminate)
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goto restart;
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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", username);
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printd("Sent login: %s\n", username);
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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", password);
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printd("Sent password: %s\n", password);
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break;
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}
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} else {
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if (strstr(&buf[1], "ogin:") != NULL) {
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fprintf(wfd, "%s\r", username);
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printd("Sent login: %s\n", username);
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continue;
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}
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if (strstr(&buf[1], "assword:") != NULL) {
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fprintf(wfd, "%s\r", password);
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printd("Sent password: %s\n", password);
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break;
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}
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}
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}
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sleep(5); /* Wait until login completed */
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if (hup || terminate)
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goto restart;
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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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syslog(LOG_ERR, "%s: ioctl (TIOCSETD SLIP): %m\n",
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devicename);
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down(2);
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}
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if (sl_unit >= 0 && ioctl(fd, SLIOCSUNIT, &sl_unit) < 0) {
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syslog(LOG_ERR, "ioctl(SLIOCSUNIT): %m");
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down(2);
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}
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if (ioctl(fd, SLIOCGUNIT, &unitnum) < 0) {
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syslog(LOG_ERR, "ioctl(SLIOCGUNIT): %m");
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down(2);
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}
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sprintf(unitname, "sl%d", unitnum);
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if (keepal > 0) {
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signal(SIGURG, sigurg);
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if (ioctl(fd, SLIOCSKEEPAL, &keepal) < 0) {
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syslog(LOG_ERR, "ioctl(SLIOCSKEEPAL): %m");
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down(2);
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}
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}
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if (outfill > 0 && ioctl(fd, SLIOCSOUTFILL, &outfill) < 0) {
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syslog(LOG_ERR, "ioctl(SLIOCSOUTFILL): %m");
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down(2);
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}
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sprintf(buf, "LINE=%d %s %s up",
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diali ? (dialc - 1) % diali : 0,
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upscript ? upscript : "/sbin/ifconfig" , unitname);
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(void) system(buf);
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printd(", ready\n");
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if (!first)
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syslog(LOG_INFO, "reconnected on %s (%d tries).\n", unitname, 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 && terminate == 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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void
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sigurg()
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{
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printd("urg\n");
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if (hup == 0 && logged_in)
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syslog(LOG_INFO, "dead line signal\n");
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hup = 1;
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}
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void
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sigterm()
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{
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printd("terminate\n");
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if (terminate == 0 && logged_in)
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syslog(LOG_INFO, "terminate signal\n");
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terminate = 1;
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}
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getline(buf, size, fd, fintimeout)
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char *buf;
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int size, fd;
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time_t fintimeout;
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{
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register int i;
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int ret;
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fd_set readfds;
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struct timeval tv;
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time_t timeout;
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size--;
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for (i = 0; i < size; i++) {
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if (hup || terminate)
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return (0);
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if ((timeout = fintimeout - time(NULL)) <= 0)
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goto tout;
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FD_ZERO(&readfds);
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FD_SET(fd, &readfds);
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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if ((ret = select(fd + 1, &readfds, NULL, NULL, &tv)) < 0) {
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if (errno != EINTR)
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syslog(LOG_ERR, "getline: select: %m");
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} else {
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if (! ret) {
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tout:
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printd("getline: timed out\n");
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return (0);
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}
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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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i--;
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continue;
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}
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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", i + 1, buf);
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return (i+1);
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}
|
|
if (ret <= 0) {
|
|
if (ret < 0) {
|
|
syslog(LOG_ERR, "getline: read: %m");
|
|
} else
|
|
syslog(LOG_ERR, "read returned 0");
|
|
buf[i] = '\0';
|
|
printd("returning %d after %d: %s\n", ret, i, buf);
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
carrier()
|
|
{
|
|
int comstate;
|
|
|
|
if (ioctl(fd, TIOCMGET, &comstate) < 0) {
|
|
syslog(LOG_ERR, "%s: ioctl (TIOCMGET): %m",
|
|
devicename);
|
|
down(2);
|
|
}
|
|
return !!(comstate & TIOCM_CD);
|
|
}
|
|
|
|
down(code)
|
|
{
|
|
if (fd > -1)
|
|
close(fd);
|
|
if (pfd)
|
|
unlink(pidfile);
|
|
if (locked)
|
|
uu_unlock(dvname);
|
|
exit(code);
|
|
}
|
|
|
|
usage()
|
|
{
|
|
(void)fprintf(stderr, "\
|
|
usage: startslip [-d] [-b speed] [-s string1 [-s string2 [...]]] [-A annexname] \\\n\
|
|
[-h] [-l] [-U upscript] [-D downscript] [-t script_timeout] \\\n\
|
|
[-w retry_pause] [-W maxtries] [-K keepalive] [-O outfill] [-S unit] \\\n\
|
|
device user passwd\n");
|
|
exit(1);
|
|
}
|