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NetBSD/usr.sbin/pppd/chat/chat.c
paulus 3f66ef1a1e Improvements to chat plus a man page from Al Longyear <longyear@netcom.com>. 
In particular, chat will now take the script from a file, which is
vastly preferable if the script contains a password.
1994-05-30 01:38:57 +00:00

1167 lines
19 KiB
C
Raw Blame History

/*
* Chat -- a program for automatic session establishment (i.e. dial
* the phone and log in).
*
* This software is in the public domain.
*
* Please send all bug reports, requests for information, etc. to:
*
* Al Longyear (longyear@netcom.com)
* (I was the last person to change this code.)
*
* The original author is:
*
* Karl Fox <karl@MorningStar.Com>
* Morning Star Technologies, Inc.
* 1760 Zollinger Road
* Columbus, OH 43221
* (614)451-1883
*/
static char rcsid[] = "$Id: chat.c,v 1.5 1994/05/30 01:39:00 paulus Exp $";
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <syslog.h>
#ifndef TERMIO
#undef TERMIOS
#define TERMIOS
#endif
#ifdef sun
# if defined(SUNOS) && SUNOS >= 41
# ifndef HDB
# define HDB
# endif
# endif
#endif
#ifdef TERMIO
#include <termio.h>
#endif
#ifdef TERMIOS
#include <termios.h>
#endif
#define STR_LEN 1024
#ifndef SIGTYPE
#define SIGTYPE void
#endif
#ifdef __STDC__
#undef __P
#define __P(x) x
#else
#define __P(x) ()
#define const
#endif
/*************** Micro getopt() *********************************************/
#define OPTION(c,v) (_O&2&&**v?*(*v)++:!c||_O&4?0:(!(_O&1)&& \
(--c,++v),_O=4,c&&**v=='-'&&v[0][1]?*++*v=='-'\
&&!v[0][1]?(--c,++v,0):(_O=2,*(*v)++):0))
#define OPTARG(c,v) (_O&2?**v||(++v,--c)?(_O=1,--c,*v++): \
(_O=4,(char*)0):(char*)0)
#define OPTONLYARG(c,v) (_O&2&&**v?(_O=1,--c,*v++):(char*)0)
#define ARG(c,v) (c?(--c,*v++):(char*)0)
static int _O = 0; /* Internal state */
/*************** Micro getopt() *********************************************/
char *program_name;
#ifndef LOCK_DIR
# ifdef __NetBSD__
# define PIDSTRING
# define LOCK_DIR "/var/spool/lock"
# else
# ifdef HDB
# define PIDSTRING
# define LOCK_DIR "/usr/spool/locks"
# else /* HDB */
# define LOCK_DIR "/usr/spool/uucp"
# endif /* HDB */
# endif
#endif /* LOCK_DIR */
#define MAX_ABORTS 50
#define DEFAULT_CHAT_TIMEOUT 45
int verbose = 0;
int quiet = 0;
char *lock_file = (char *)0;
char *chat_file = (char *)0;
int timeout = DEFAULT_CHAT_TIMEOUT;
int have_tty_parameters = 0;
#ifdef TERMIO
struct termio saved_tty_parameters;
#endif
#ifdef TERMIOS
struct termios saved_tty_parameters;
#endif
char *abort_string[MAX_ABORTS], *fail_reason = (char *)0,
fail_buffer[50];
int n_aborts = 0, abort_next = 0, timeout_next = 0;
void *dup_mem __P((void *b, size_t c));
void *copy_of __P((char *s));
void usage __P((void));
void logf __P((const char *str));
void logflush __P((void));
void fatal __P((const char *msg));
void sysfatal __P((const char *msg));
SIGTYPE sigalrm __P((int signo));
SIGTYPE sigint __P((int signo));
SIGTYPE sigterm __P((int signo));
SIGTYPE sighup __P((int signo));
void unalarm __P((void));
void init __P((void));
void set_tty_parameters __P((void));
void break_sequence __P((void));
void terminate __P((int status));
void do_file __P((char *chat_file));
void lock __P((void));
void delay __P((void));
int get_string __P((register char *string));
int put_string __P((register char *s));
int write_char __P((int c));
int put_char __P((char c));
int get_char __P((void));
void chat_send __P((register char *s));
char *character __P((char c));
void chat_expect __P((register char *s));
char *clean __P((register char *s, int sending));
void unlock __P((void));
void lock __P((void));
void break_sequence __P((void));
void terminate __P((int status));
void die __P((void));
void *dup_mem(b, c)
void *b;
size_t c;
{
void *ans = malloc (c);
if (!ans)
fatal ("memory error!\n");
memcpy (ans, b, c);
return ans;
}
void *copy_of (s)
char *s;
{
return dup_mem (s, strlen (s) + 1);
}
/*
* chat [ -v ] [ -t timeout ] [ -l lock-file ] [ -f chat-file ] \
* [...[[expect[-say[-expect...]] say expect[-say[-expect]] ...]]]
*
* Perform a UUCP-dialer-like chat script on stdin and stdout.
*/
int
main(argc, argv)
int argc;
char **argv;
{
int option;
char *arg;
program_name = *argv;
while (option = OPTION(argc, argv))
switch (option)
{
case 'v':
++verbose;
break;
case 'f':
if (arg = OPTARG(argc, argv))
chat_file = copy_of(arg);
else
usage();
break;
case 'l':
if (arg = OPTARG(argc, argv))
lock_file = copy_of(arg);
else
usage();
break;
case 't':
if (arg = OPTARG(argc, argv))
timeout = atoi(arg);
else
usage();
break;
default:
usage();
}
#ifdef ultrix
openlog("chat", LOG_PID);
#else
openlog("chat", LOG_PID | LOG_NDELAY, LOG_LOCAL2);
if (verbose) {
setlogmask(LOG_UPTO(LOG_INFO));
} else {
setlogmask(LOG_UPTO(LOG_WARNING));
}
#endif
init();
if (chat_file != NULL)
{
arg = ARG(argc, argv);
if (arg != NULL)
usage();
else
do_file (chat_file);
}
else
{
while (arg = ARG(argc, argv))
{
chat_expect(arg);
if (arg = ARG(argc, argv))
chat_send(arg);
}
}
terminate(0);
}
/*
* Process a chat script when read from a file.
*/
void do_file (chat_file)
char *chat_file;
{
int linect, len, sendflg;
char *sp, *arg, quote;
char buf [STR_LEN];
FILE *cfp;
if ((cfp = fopen (chat_file, "r")) == NULL)
{
syslog (LOG_ERR, "%s -- open failed: %m", chat_file);
terminate (1);
}
linect = 0;
sendflg = 0;
while (fgets(buf, STR_LEN, cfp) != NULL)
{
sp = strchr (buf, '\n');
if (sp)
*sp = '\0';
linect++;
sp = buf;
while (*sp != '\0')
{
if (*sp == ' ' || *sp == '\t')
{
++sp;
continue;
}
if (*sp == '"' || *sp == '\'')
{
quote = *sp++;
arg = sp;
while (*sp != quote)
{
if (*sp == '\0')
{
syslog (LOG_ERR, "unterminated quote (line %d)",
linect);
terminate (1);
}
if (*sp++ == '\\')
if (*sp != '\0')
++sp;
}
}
else
{
arg = sp;
while (*sp != '\0' && *sp != ' ' && *sp != '\t')
++sp;
}
if (*sp != '\0')
*sp++ = '\0';
if (sendflg)
{
chat_send (arg);
}
else
{
chat_expect (arg);
}
sendflg = !sendflg;
}
}
fclose (cfp);
}
/*
* We got an error parsing the command line.
*/
void usage()
{
fprintf(stderr, "\
Usage: %s [-v] [-l lock-file] [-t timeout] {-f chat-file || chat-script}\n",
program_name);
exit(1);
}
char line[256];
char *p;
void logf (str)
const char *str;
{
p = line + strlen(line);
strcat (p, str);
if (str[strlen(str)-1] == '\n')
{
syslog (LOG_INFO, "%s", line);
line[0] = 0;
}
}
void logflush()
{
if (line[0] != 0)
{
syslog(LOG_INFO, "%s", line);
line[0] = 0;
}
}
/*
* Unlock and terminate with an error.
*/
void die()
{
unlock();
terminate(1);
}
/*
* Print an error message and terminate.
*/
void fatal (msg)
const char *msg;
{
syslog(LOG_ERR, "%s", msg);
unlock();
terminate(1);
}
/*
* Print an error message along with the system error message and
* terminate.
*/
void sysfatal (msg)
const char *msg;
{
syslog(LOG_ERR, "%s: %m", msg);
unlock();
terminate(1);
}
int alarmed = 0;
SIGTYPE sigalrm(signo)
int signo;
{
int flags;
alarm(1);
alarmed = 1; /* Reset alarm to avoid race window */
signal(SIGALRM, sigalrm); /* that can cause hanging in read() */
logflush();
if ((flags = fcntl(0, F_GETFL, 0)) == -1)
sysfatal("Can't get file mode flags on stdin");
else
if (fcntl(0, F_SETFL, flags | FNDELAY) == -1)
sysfatal("Can't set file mode flags on stdin");
if (verbose)
{
syslog(LOG_INFO, "alarm");
}
}
void unalarm()
{
int flags;
if ((flags = fcntl(0, F_GETFL, 0)) == -1)
sysfatal("Can't get file mode flags on stdin");
else
if (fcntl(0, F_SETFL, flags & ~FNDELAY) == -1)
sysfatal("Can't set file mode flags on stdin");
}
SIGTYPE sigint(signo)
int signo;
{
fatal("SIGINT");
}
SIGTYPE sigterm(signo)
int signo;
{
fatal("SIGTERM");
}
SIGTYPE sighup(signo)
int signo;
{
fatal("SIGHUP");
}
void init()
{
signal(SIGINT, sigint);
signal(SIGTERM, sigterm);
signal(SIGHUP, sighup);
if (lock_file)
lock();
set_tty_parameters();
signal(SIGALRM, sigalrm);
alarm(0);
alarmed = 0;
}
void set_tty_parameters()
{
#ifdef TERMIO
struct termio t;
if (ioctl(0, TCGETA, &t) < 0)
sysfatal("Can't get terminal parameters");
#endif
#ifdef TERMIOS
struct termios t;
if (tcgetattr(0, &t) < 0)
sysfatal("Can't get terminal parameters");
#endif
saved_tty_parameters = t;
have_tty_parameters = 1;
t.c_iflag |= IGNBRK | ISTRIP | IGNPAR;
t.c_oflag = 0;
t.c_lflag = 0;
t.c_cc[VERASE] = t.c_cc[VKILL] = 0;
t.c_cc[VMIN] = 1;
t.c_cc[VTIME] = 0;
#ifdef TERMIO
if (ioctl(0, TCSETA, &t) < 0)
sysfatal("Can't set terminal parameters");
#endif
#ifdef TERMIOS
if (tcsetattr(0, TCSANOW, &t) < 0)
sysfatal("Can't set terminal parameters");
#endif
}
void break_sequence()
{
#ifdef TERMIOS
tcsendbreak (0, 0);
#endif
}
void terminate(status)
int status;
{
if (have_tty_parameters &&
#ifdef TERMIO
ioctl(0, TCSETA, &saved_tty_parameters) < 0
#endif
#ifdef TERMIOS
tcsetattr(0, TCSANOW, &saved_tty_parameters) < 0
#endif
) {
syslog(LOG_ERR, "Can't restore terminal parameters: %m");
unlock();
exit(1);
}
exit(status);
}
/*
* Create a lock file for the named lock device
*/
void lock()
{
int fd, pid;
# ifdef PIDSTRING
char hdb_lock_buffer[12];
# endif
lock_file = strcat(strcat(strcpy(malloc(strlen(LOCK_DIR)
+ 1 + strlen(lock_file) + 1),
LOCK_DIR), "/"), lock_file);
if ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0)
{
char *s = lock_file;
lock_file = (char *)0; /* Don't remove someone else's lock file! */
syslog(LOG_ERR, "Can't get lock file '%s': %m", s);
die();
}
# ifdef PIDSTRING
sprintf(hdb_lock_buffer, "%10d\n", getpid());
write(fd, hdb_lock_buffer, 11);
# else
pid = getpid();
write(fd, &pid, sizeof pid);
# endif
close(fd);
}
/*
* Remove our lockfile
*/
void unlock()
{
if (lock_file)
{
unlink(lock_file);
lock_file = (char *)0;
}
}
/*
* 'Clean up' this string.
*/
char *clean(s, sending)
register char *s;
int sending;
{
char temp[STR_LEN], cur_chr;
register char *s1;
int add_return = sending;
#define isoctal(chr) (((chr) >= '0') && ((chr) <= '7'))
s1 = temp;
while (*s)
{
cur_chr = *s++;
if (cur_chr == '^')
{
cur_chr = *s++;
if (cur_chr == '\0')
{
*s1++ = '^';
break;
}
cur_chr &= 0x1F;
if (cur_chr != 0)
*s1++ = cur_chr;
continue;
}
if (cur_chr != '\\')
{
*s1++ = cur_chr;
continue;
}
cur_chr = *s++;
if (cur_chr == '\0')
{
if (sending)
{
*s1++ = '\\';
*s1++ = '\\';
}
break;
}
switch (cur_chr)
{
case 'b':
*s1++ = '\b';
break;
case 'c':
if (sending && *s == '\0')
add_return = 0;
else
*s1++ = cur_chr;
break;
case '\\':
case 'K':
case 'p':
case 'd':
if (sending)
*s1++ = '\\';
*s1++ = cur_chr;
break;
case 'q':
quiet = ! quiet;
break;
case 'r':
*s1++ = '\r';
break;
case 'n':
*s1++ = '\n';
break;
case 's':
*s1++ = ' ';
break;
case 't':
*s1++ = '\t';
break;
case 'N':
if (sending)
{
*s1++ = '\\';
*s1++ = '\0';
}
else
*s1++ = 'N';
break;
default:
if (isoctal (cur_chr))
{
cur_chr &= 0x07;
if (isoctal (*s))
{
cur_chr <<= 3;
cur_chr |= *s++ - '0';
if (isoctal (*s))
{
cur_chr <<= 3;
cur_chr |= *s++ - '0';
}
}
if (cur_chr != 0 || sending)
{
if (sending && (cur_chr == '\\' || cur_chr == 0))
*s1++ = '\\';
*s1++ = cur_chr;
}
break;
}
if (sending)
*s1++ = '\\';
*s1++ = cur_chr;
break;
}
}
if (add_return)
*s1++ = '\r';
*s1++ = '\0'; /* guarantee closure */
*s1++ = '\0'; /* terminate the string */
return dup_mem (temp, (size_t) (s1 - temp)); /* may have embedded nuls */
}
/*
* Process the expect string
*/
void chat_expect(s)
register char *s;
{
if (strcmp(s, "ABORT") == 0)
{
++abort_next;
return;
}
if (strcmp(s, "TIMEOUT") == 0)
{
++timeout_next;
return;
}
while (*s)
{
register char *hyphen;
for (hyphen = s; *hyphen; ++hyphen)
if (*hyphen == '-')
if (hyphen == s || hyphen[-1] != '\\')
break;
if (*hyphen == '-')
{
*hyphen = '\0';
if (get_string(s))
return;
else
{
s = hyphen + 1;
for (hyphen = s; *hyphen; ++hyphen)
if (*hyphen == '-')
if (hyphen == s || hyphen[-1] != '\\')
break;
if (*hyphen == '-')
{
*hyphen = '\0';
chat_send(s);
s = hyphen + 1;
}
else
{
chat_send(s);
return;
}
}
}
else
if (get_string(s))
return;
else
{
if (fail_reason)
syslog(LOG_INFO, "Failed (%s)", fail_reason);
else
syslog(LOG_INFO, "Failed");
unlock();
terminate(1);
}
}
}
char *character(c)
char c;
{
static char string[10];
char *meta;
meta = (c & 0x80) ? "M-" : "";
c &= 0x7F;
if (c < 32)
sprintf(string, "%s^%c", meta, (int)c + '@');
else
if (c == 127)
sprintf(string, "%s^?", meta);
else
sprintf(string, "%s%c", meta, c);
return (string);
}
/*
* process the reply string
*/
void chat_send (s)
register char *s;
{
if (abort_next)
{
char *s1;
abort_next = 0;
if (n_aborts >= MAX_ABORTS)
fatal("Too many ABORT strings");
s1 = clean(s, 0);
if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1)
{
syslog(LOG_WARNING, "Illegal or too-long ABORT string ('%s')", s);
die();
}
abort_string[n_aborts++] = s1;
if (verbose)
{
logf("abort on (");
for (s1 = s; *s1; ++s1)
logf(character(*s1));
logf(")\n");
}
}
else
if (timeout_next)
{
timeout_next = 0;
timeout = atoi(s);
if (timeout <= 0)
timeout = DEFAULT_CHAT_TIMEOUT;
if (verbose)
{
syslog(LOG_INFO, "timeout set to %d seconds", timeout);
}
}
else
{
if (strcmp(s, "EOT") == 0)
s = "^D\\c";
else
if (strcmp(s, "BREAK") == 0)
s = "\\K\\c";
if ( ! put_string(s))
{
syslog(LOG_INFO, "Failed");
unlock();
terminate(1);
}
}
}
int get_char()
{
int status;
char c;
status = read(0, &c, 1);
switch (status)
{
case 1:
return ((int)c & 0x7F);
default:
syslog(LOG_WARNING, "warning: read() on stdin returned %d",
status);
case -1:
if ((status = fcntl(0, F_GETFL, 0)) == -1)
sysfatal("Can't get file mode flags on stdin");
else
if (fcntl(0, F_SETFL, status & ~FNDELAY) == -1)
sysfatal("Can't set file mode flags on stdin");
return (-1);
}
}
int put_char(c)
char c;
{
int status;
delay();
status = write(1, &c, 1);
switch (status)
{
case 1:
return (0);
default:
syslog(LOG_WARNING, "warning: write() on stdout returned %d",
status);
case -1:
if ((status = fcntl(0, F_GETFL, 0)) == -1)
sysfatal("Can't get file mode flags on stdin");
else
if (fcntl(0, F_SETFL, status & ~FNDELAY) == -1)
sysfatal("Can't set file mode flags on stdin");
return (-1);
}
}
int write_char (c)
int c;
{
if (alarmed || put_char(c) < 0)
{
extern int errno;
alarm(0); alarmed = 0;
if (verbose)
{
if (errno == EINTR || errno == EWOULDBLOCK)
syslog(LOG_INFO, " -- write timed out");
else
syslog(LOG_INFO, " -- write failed: %m");
}
return (0);
}
return (1);
}
int put_string (s)
register char *s;
{
s = clean(s, 1);
if (verbose)
{
logf("send (");
if (quiet)
logf("??????");
else
{
register char *s1 = s;
for (s1 = s; *s1; ++s1)
logf(character(*s1));
}
logf(")\n");
}
alarm(timeout); alarmed = 0;
while (*s)
{
register char c = *s++;
if (c != '\\')
{
if (!write_char (c))
return 0;
continue;
}
c = *s++;
switch (c)
{
case 'd':
sleep(1);
break;
case 'K':
break_sequence();
break;
case 'p':
usleep(10000); /* 1/100th of a second. */
break;
default:
if (!write_char (c))
return 0;
break;
}
}
alarm(0);
alarmed = 0;
return (1);
}
/*
* 'Wait for' this string to appear on this file descriptor.
*/
int get_string(string)
register char *string;
{
char temp[STR_LEN];
int c, printed = 0, len, minlen;
register char *s = temp, *end = s + STR_LEN;
fail_reason = (char *)0;
string = clean(string, 0);
len = strlen(string);
minlen = (len > sizeof(fail_buffer)? len: sizeof(fail_buffer)) - 1;
if (verbose)
{
register char *s1;
logf("expect (");
for (s1 = string; *s1; ++s1)
logf(character(*s1));
logf(")\n");
}
if (len > STR_LEN)
{
syslog(LOG_INFO, "expect string is too long");
return 0;
}
if (len == 0)
{
if (verbose)
{
syslog(LOG_INFO, "got it");
}
return (1);
}
alarm(timeout); alarmed = 0;
while ( ! alarmed && (c = get_char()) >= 0)
{
int n, abort_len;
if (verbose)
{
if (c == '\n')
logf("\n");
else
logf(character(c));
}
*s++ = c;
if (s - temp >= len &&
c == string[len - 1] &&
strncmp(s - len, string, len) == 0)
{
if (verbose)
{
logf(" -- got it\n");
}
alarm(0); alarmed = 0;
return (1);
}
for (n = 0; n < n_aborts; ++n)
if (s - temp >= (abort_len = strlen(abort_string[n])) &&
strncmp(s - abort_len, abort_string[n], abort_len) == 0)
{
if (verbose)
{
logf(" -- failed\n");
}
alarm(0); alarmed = 0;
strcpy(fail_reason = fail_buffer, abort_string[n]);
return (0);
}
if (s >= end)
{
strncpy(temp, s - minlen, minlen);
s = temp + minlen;
}
if (alarmed && verbose)
syslog(LOG_WARNING, "warning: alarm synchronization problem");
}
alarm(0);
if (verbose && printed)
{
if (alarmed)
logf(" -- read timed out\n");
else
{
logflush();
syslog(LOG_INFO, " -- read failed: %m");
}
}
alarmed = 0;
return (0);
}
#ifdef ultrix
#undef NO_USLEEP
#include <sys/types.h>
#include <sys/time.h>
/*
usleep -- support routine for 4.2BSD system call emulations
last edit: 29-Oct-1984 D A Gwyn
*/
extern int select();
int
usleep( usec ) /* returns 0 if ok, else -1 */
long usec; /* delay in microseconds */
{
static struct /* `timeval' */
{
long tv_sec; /* seconds */
long tv_usec; /* microsecs */
} delay; /* _select() timeout */
delay.tv_sec = usec / 1000000L;
delay.tv_usec = usec % 1000000L;
return select( 0, (long *)0, (long *)0, (long *)0, &delay );
}
#endif
/*
* Delay an amount appropriate for between typed characters.
*/
void delay()
{
# ifdef NO_USLEEP
register int i;
for (i = 0; i < 30000; ++i) /* ... did we just say appropriate? */
;
# else /* NO_USLEEP */
usleep(100);
# endif /* NO_USLEEP */
}
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