596 lines
14 KiB
C
596 lines
14 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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* 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 const 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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#if 0
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static char sccsid[] = "@(#)startslip.c 8.1 (Berkeley) 6/5/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libutil.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <termios.h>
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#include <unistd.h>
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#include <net/slip.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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int uucp_lock = 0; /* uucp locking */
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char *annex;
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char *username;
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int hup;
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int terminate;
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int locked = 0; /* uucp lock active */
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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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time_t conn_time, start_time;
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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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int carrier(void);
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void down(int);
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int getline(char *, int, int, time_t);
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void sighup(int);
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void sigterm(int);
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void sigurg(int);
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static void usage(void);
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int
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main(int argc, char **argv)
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{
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char *cp, **ap;
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int ch, disc;
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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 *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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long lpid;
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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:L")) != -1)
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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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errx(1, "max dial strings number (%d) exceeded", MAXDIALS);
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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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uucp_lock = 1;
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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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if (snprintf(pidfile, sizeof(pidfile), PIDFILE, _PATH_VARRUN, dvname)
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>= (int)sizeof(pidfile))
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usage();
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if ((pfd = fopen(pidfile, "r")) != NULL) {
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if (fscanf(pfd, "%ld\n", &lpid) == 1) {
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pid = lpid;
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if (pid == lpid && pid > 0)
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kill(pid, SIGTERM);
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}
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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 (wfd) {
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printd("fclose, ");
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fclose(wfd);
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conn_time = time(NULL) - start_time;
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if (uucp_lock)
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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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conn_time = time(NULL) - start_time;
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if (uucp_lock)
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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 (logged_in) {
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syslog(LOG_INFO, "%s: connection time elapsed: %ld secs",
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username, (long)conn_time);
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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 : _PATH_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, "%s: exiting login after %d tries", username, 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 (tries > 1) {
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syslog(LOG_INFO, "%s: sleeping %d seconds (%d tries)",
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username, 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, "%s: daemon: %m", username);
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down(2);
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}
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pid = getpid();
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printd("restart: pid %ld: ", (long)pid);
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if ((pfd = fopen(pidfile, "w")) != NULL) {
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fprintf(pfd, "%ld\n", (long)pid);
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fclose(pfd);
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}
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printd("open");
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if (uucp_lock) {
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int res;
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if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
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if (res != UU_LOCK_INUSE)
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syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
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syslog(LOG_ERR, "%s: can't lock %s", username, devicename);
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goto restart;
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}
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locked = 1;
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}
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if ((fd = open(devicename, O_RDWR | O_NONBLOCK)) < 0) {
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syslog(LOG_ERR, "%s: open %s: %m", username, devicename);
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if (first)
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down(1);
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else {
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if (uucp_lock)
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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, "%s: ioctl (TIOCSCTTY): %m", username);
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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, "%s: tcsetpgrp failed: %m", username);
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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(%s): %m", username, 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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cfsetispeed(&t, speed);
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cfsetospeed(&t, speed);
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if (tcsetattr(fd, TCSAFLUSH, &t) < 0) {
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syslog(LOG_ERR, "%s: tcsetattr(%s): %m", username, 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, "%s: can't fdopen %s: %m", username, 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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syslog(LOG_INFO, "%s: dialer string: %s\\r", username, dialerstring);
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fprintf(wfd, "%s\r", dialerstring);
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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(%s): %m", username, devicename);
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down(2);
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}
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/* Only now we able to receive HUP on carrier 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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start_time = time(NULL);
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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 (%s, TIOCSETD): %m",
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username, 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, "%s: ioctl(SLIOCSUNIT): %m", username);
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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, "%s: ioctl(SLIOCGUNIT): %m", username);
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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, "%s: ioctl(SLIOCSKEEPAL): %m", username);
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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, "%s: ioctl(SLIOCSOUTFILL): %m", username);
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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 : _PATH_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, "%s: reconnected on %s (%d tries)", username, unitname, tries);
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else
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syslog(LOG_INFO, "%s: connected on %s", username, unitname);
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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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return(0); /* not reached */
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}
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void
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sighup(int sig __unused)
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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, "%s: got hangup signal", username);
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hup = 1;
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}
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void
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sigurg(int sig __unused)
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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, "%s: got dead line signal", username);
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hup = 1;
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}
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void
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sigterm(int sig __unused)
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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, "%s: got terminate signal", username);
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terminate = 1;
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}
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int
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getline(char *buf, int size, int fd, time_t fintimeout)
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{
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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);
|
|
tv.tv_sec = timeout;
|
|
tv.tv_usec = 0;
|
|
if ((ret = select(fd + 1, &readfds, NULL, NULL, &tv)) < 0) {
|
|
if (errno != EINTR)
|
|
syslog(LOG_ERR, "%s: getline: select: %m", username);
|
|
} else {
|
|
if (! ret) {
|
|
tout:
|
|
printd("getline: timed out\n");
|
|
return (0);
|
|
}
|
|
if ((ret = read(fd, &buf[i], 1)) == 1) {
|
|
buf[i] &= 0177;
|
|
if (buf[i] == '\r' || buf[i] == '\0') {
|
|
i--;
|
|
continue;
|
|
}
|
|
if (buf[i] != '\n' && buf[i] != ':')
|
|
continue;
|
|
buf[i + 1] = '\0';
|
|
printd("Got %d: %s", i + 1, buf);
|
|
return (i+1);
|
|
}
|
|
if (ret <= 0) {
|
|
if (ret < 0) {
|
|
syslog(LOG_ERR, "%s: getline: read: %m", username);
|
|
} else
|
|
syslog(LOG_ERR, "%s: read returned 0", username);
|
|
buf[i] = '\0';
|
|
printd("returning %d after %d: %s\n", ret, i, buf);
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
carrier(void)
|
|
{
|
|
int comstate;
|
|
|
|
if (ioctl(fd, TIOCMGET, &comstate) < 0) {
|
|
syslog(LOG_ERR, "%s: ioctl (%s, TIOCMGET): %m",
|
|
username, devicename);
|
|
down(2);
|
|
}
|
|
return !!(comstate & TIOCM_CD);
|
|
}
|
|
|
|
void
|
|
down(int code)
|
|
{
|
|
if (fd > -1)
|
|
close(fd);
|
|
if (pfd)
|
|
unlink(pidfile);
|
|
if (uucp_lock && locked)
|
|
uu_unlock(dvname);
|
|
exit(code);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
|
|
"usage: startslip [-d] [-b speed] [-s string1 [-s string2 [...]]] [-h] [-l]",
|
|
" [-L] [-A annexname] [-U upscript] [-D downscript]",
|
|
" [-t script_timeout] [-W maxtries] [-w retry_pause]",
|
|
" [-K keepalive] [-O outfill] [-S unit] device user password");
|
|
exit(1);
|
|
}
|