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/*
* Copyright (c) 1999, 2001 Hellmuth Michaelis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------
*
* i4brunppp - run userland ppp for incoming call from rbch i/f
* ------------------------------------------------------------
*
* $FreeBSD$
*
* last edit-date: [Sat Jul 21 13:38:10 2001]
*
*---------------------------------------------------------------------------
*
* BEWARE: HIGHLY EXPERIMENTAL!
* ---------------------------
*
* This program is used in conjunction with a isdnd.rc entry similar to
*
* regexpr = "ULPPP.*call active" # look for matches in log messages
* regprog = i4brunppp # execute program when match is found
*
* this one. It _must_ be put into /etc/isdn!
* When an active call is detected, isdnd fires off i4brunppp, which attaches
* the rbch device used to stdin/stdout and then runs ppp which is given the
* "-direct" command and the string "inc_rbchX" (where X is the i4brbch unit
* number) as arguments.
*
*---------------------------------------------------------------------------*/
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <machine/i4b_ioctl.h>
#include <machine/i4b_rbch_ioctl.h>
#define I4BDEVICE "/dev/i4b"
#define PPPPROG "/usr/sbin/ppp"
#define PPPNAME "ppp"
#define PPPARG1 "-direct"
#define PPPLABEL "inc_"
#define VERIFYSTRING "call active"
#define DEVSTRING "rbch"
#define PPPDEBUG
/*---------------------------------------------------------------------------*
* program entry
*---------------------------------------------------------------------------*/
int
main(int argc, char **argv)
{
char buffer[256];
int rbch_fd;
char *p = "DeadPointer";
int found;
int i;
#ifdef PPPDEBUG
FILE *dfp;
time_t tim;
register struct tm *tp;
#endif
/* open syslog */
(void)openlog("i4brunppp", LOG_PID|LOG_CONS|LOG_NDELAY, LOG_USER);
#ifdef PPPDEBUG
/* open debug log */
if((dfp = fopen("/tmp/i4brunppp-debug.log", "a")) == NULL)
{
syslog(LOG_INFO, "cannot open logfile: %s", strerror(errno));
exit(1);
}
tim = time(NULL);
tp = localtime(&tim);
strftime(buffer, 40, I4B_TIME_FORMAT, tp);
fprintf(dfp, "\n=================== %s ===================\n", buffer);
for(i=0; i < argc; i++)
fprintf(dfp, "\t%s\n", argv[i]);
#endif
/* check if this is the right message */
found = 0;
for(i=0; i < argc; i++)
{
if((strstr(argv[i], VERIFYSTRING)) != NULL)
{
found = 1;
break;
}
}
if(found == 0)
{
#ifdef PPPDEBUG
fprintf(dfp, "did not found [%s], exit\n", VERIFYSTRING);
#endif
exit(0);
}
found = 0;
/* check if we got a good device name */
for(; i < argc; i++)
{
if((p = strstr(argv[i], DEVSTRING)) != NULL)
{
found = 1;
break;
}
}
if(found == 0)
{
#ifdef PPPDEBUG
fprintf(dfp, "did not found [%s], exit\n", DEVSTRING);
#endif
exit(0);
}
/* everything ok, now prepare for running ppp */
/* close all file descriptors */
i = getdtablesize();
for(;i >= 0; i--)
if (i != 2)
close(i);
/* fiddle a terminating zero after the rbch unit number */
p += strlen(DEVSTRING);
if(isdigit(*p) && isdigit(*(p+1)))
*(p+2) = '\0';
else
*(p+1) = '\0';
/* construct /dev/i4brbchX device name */
sprintf(buffer, "%s%s%s", I4BDEVICE, DEVSTRING, p);
/* open the rbch device as fd 0 = stdin */
rbch_fd = open(buffer, O_RDWR);
if(rbch_fd != 0)
{
if(rbch_fd < 0)
syslog(LOG_INFO, "cannot open %s: %s", buffer, strerror(errno));
else
syslog(LOG_INFO, "cannot open %s as fd 0 (is %d): %s", buffer, rbch_fd, strerror(errno));
exit(1);
}
/* dup rbch device fd as fd 1 = stdout */
if((i = dup(rbch_fd)) != 1)
{
if(i < 0)
syslog(LOG_INFO, "cannot dup rbch_fd: %s", strerror(errno));
else
syslog(LOG_INFO, "cannot dup rbch as fd 1 (is %d): %s", i, strerror(errno));
exit(1);
}
/* construct the label for ppp's ppp.conf file */
sprintf(buffer, "%s%s%s", PPPLABEL, DEVSTRING, p);
syslog(LOG_INFO, "executing: %s %s %s %s", PPPPROG, PPPNAME, PPPARG1, buffer);
/* execute ppp */
if((execl(PPPPROG, PPPNAME, PPPARG1, buffer, NULL)) == -1)
{
syslog(LOG_INFO, "cannot exec: %s", strerror(errno));
exit(1);
}
syslog(LOG_INFO, "finished: %s %s %s %s", PPPPROG, PPPNAME, PPPARG1, buffer);
return(0);
}
/* EOF */
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