chat for ppp, from ppp 2.1.2

3 files changed, 1425 insertions, 0 deletions

diff --git a/usr.bin/chat/Makefile b/usr.bin/chat/Makefile
new file mode 100644
index 0000000..be27271
--- /dev/null
+++ b/usr.bin/chat/Makefile
@@ -0,0 +1,8 @@
+#	$Id: Makefile.bsd,v 1.2 1994/05/26 06:45:03 paulus Exp $
+
+PROG=	chat
+SRCS=	chat.c
+MAN8=	chat.8
+BINDIR=	/usr/bin
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/chat/chat.8 b/usr.bin/chat/chat.8
new file mode 100644
index 0000000..3d2eee0
--- /dev/null
+++ b/usr.bin/chat/chat.8
@@ -0,0 +1,251 @@
+.\" -*- nroff -*-
+.\" manual page [] for chat 1.8
+.\" $Id: chat.8,v 1.7 1994/03/04 20:19:30 callahan Exp $
+.\" SH section heading
+.\" SS subsection heading
+.\" LP paragraph
+.\" IP indented paragraph
+.\" TP hanging label
+.TH CHAT 8 "17 April 1994" "Chat Version 1.8"
+.SH NAME
+chat \- Automated conversational script with a modem
+.SH SYNOPSIS
+.B chat
+[
+.I options
+]
+.I script
+.SH DESCRIPTION
+.LP
+The \fIchat\fR program defines a conversational exchange between the
+computer and the modem. Its primary purpose is to establish the
+connection between the Point-to-Point Protocol Daemon (\fIpppd\fR) and
+the remote's \fIpppd\fR process.
+.SH OPTIONS
+.TP
+.B -f \fI<chat file>
+Read the chat script from the chat \fIfile\fR. The use of this option
+is mutually exclusive with the chat script parameters. The user must
+have read access to the file. Multiple lines are permitted in the
+file. Space or horizontal tab characters should be used to separate
+the strings.
+.TP
+.B -l \fI<lock file>
+Perform the UUCP style locking using the indicated lock file.
+.IP
+If the file could not be created then the \fIchat\fR program will
+fail. The lock file will be deleted only if the \fIchat\fR program
+fails to perform the script for any reason. If the script is
+successful the lock file will be left on the disk. It is expected that
+the lock file will be deleted when the \fIpppd\fR process no longer
+wishes to use the serial device.
+.IP
+The use of a lock file with 
+.I chat
+and 
+\fIpppd\fR\'s
+.I lock
+option should not be used at the same time. They are mutually
+exclusive options and will cause one or the other program to fail to
+achieve the required lock if you use both.
+.TP
+.B -t \fI<timeout>
+Set the timeout for the expected string to be received. If the string
+is not received within the time limit then the reply string is not
+sent. An alternate reply may be sent or the script will fail if there
+is no alternate reply string. A failed script will cause the
+\fIchat\fR program to terminate with a non-zero error code.
+.TP
+.B -v
+Request that the \fIchat\fR script be executed in a verbose mode. The
+\fIchat\fR program will then log all text received from the modem and
+the output strings which it sends to the SYSLOG.
+.TP
+.B script
+If the script is not specified in a file with the \fI-f\fR option then
+the script is included as parameters to the \fIchat\fR program.
+.SH CHAT SCRIPT
+.LP
+The \fIchat\fR script defines the communications.
+.LP
+A script consists of one or more "expect-send" pairs of strings,
+separated by spaces, with an optional "subexpect-subsend" string pair,
+separated by a dash as in the following example:
+.IP
+ogin:-BREAK-ogin: ppp ssword: hello2u2
+.LP
+This line indicates that the \fIchat\fR program should expect the string
+"ogin:". If it fails to receive a login prompt within the time interval
+allotted, it is to send a break sequence to the remote and then expect the
+string "ogin:". If the first "ogin:" is received then the break sequence is
+not generated.
+.LP
+Once it received the login prompt the \fIchat\fR program will send the string ppp
+and then expect the prompt "ssword:". When it receives the prompt for the
+password, it will send the password hello2u2.
+.LP
+A carriage return is normally sent following the reply string. It is not
+expected in the "expect" string unless it is specifically requested by using
+the \\r character sequence.
+.LP
+The expect sequence should contain only what is needed to identify the
+string. Since it is normally stored on a disk file, it should not contain
+variable information. It is generally not acceptable to look for time
+strings, network identification strings, or other variable pieces of data as
+an expect string.
+.LP
+To help correct for characters which may be corrupted during the initial
+sequence, look for the string "ogin:" rather than "login:". It is possible
+that the leading "l" character may be received in error and you may never
+find the string even though it was sent by the system. For this reason,
+scripts look for "ogin:" rather than "login:" and "ssword:" rather than
+"password:".
+.LP
+A very simple script might look like this:
+.IP
+ogin: ppp ssword: hello2u2
+.LP
+In other words, expect ....ogin:, send ppp, expect ...ssword:, send hello2u2.
+.LP
+In actual practice, simple scripts are rare. At the vary least, you
+should include sub-expect sequences should the original string not be
+received. For example, consider the following script:
+.IP
+ogin:--ogin: ppp ssowrd: hello2u2
+.LP
+This would be a better script than the simple one used earlier. This would look
+for the same login: prompt, however, if one was not received, a single
+return sequence is sent and then it will look for login: again. Should line
+noise obscure the first login prompt then sending the empty line will
+usually generate a login prompt again.
+.SH ABORT STRINGS
+Many modems will report the status of the call as a string. These
+strings may be \fBCONNECTED\fR or \fBNO CARRIER\fR or \fBBUSY\fR. It
+is often desirable to terminate the script should the modem fail to
+connect to the remote. The difficulty is that a script would not know
+exactly which modem string it may receive. On one attempt, it may
+receive \fBBUSY\fR while the next time it may receive \fBNO CARRIER\fR.
+.LP
+These "abort" strings may be specified in the script using the \fIABORT\fR
+sequence. It is written in the script as in the following example:
+.IP
+ABORT BUSY ABORT 'NO CARRIER' '' ATZ OK ATDT5551212 CONNECT
+.LP
+This sequence will expect nothing; and then send the string ATZ. The
+expected response to this is the string \fIOK\fR. When it receives \fIOK\fR,
+the string ATDT5551212 to dial the telephone. The expected string is
+\fICONNECT\fR. If the string \fICONNECT\fR is received the remainder of the
+script is executed. However, should the modem find a busy telephone, it will
+send the string \fIBUSY\fR. This will cause the string to match the abort
+character sequence. The script will then fail because it found a match to
+the abort string. If it received the string \fINO CARRIER\fR, it will abort
+for the same reason. Either string may be received. Either string will
+terminate the \fIchat\fR script.
+.SH TIMEOUT
+The initial timeout value is 45 seconds. This may be changed using the \fB-t\fR
+parameter.
+.LP
+To change the timeout value for the next expect string, the following
+example may be used:
+.IP
+ATZ OK ATDT5551212 CONNECT TIMEOUT 10 ogin:--ogin: TIMEOUT 5 assowrd: hello2u2
+.LP
+This will change the timeout to 10 seconds when it expects the login:
+prompt. The timeout is then changed to 5 seconds when it looks for the
+password prompt.
+.LP
+The timeout, once changed, remains in effect until it is changed again.
+.SH SENDING EOT
+The special reply string of \fIEOT\fR indicates that the chat program
+should send an EOT character to the remote. This is normally the
+End-of-file character sequence. A return character is not sent
+following the EOT.
+.PR
+The EOT sequence may be embedded into the send string using the
+sequence \fI^D\fR.
+.SH GENERATING BREAK
+The special reply string of \fIBREAK\fR will cause a break condition
+to be sent. The break is a special signal on the transmitter. The
+normal processing on the receiver is to change the transmission rate.
+It may be used to cycle through the available transmission rates on
+the remote until you are able to receive a valid login prompt.
+.PR
+The break sequence may be embedded into the send string using the
+\fI\\K\fR sequence.
+.SH ESCAPE SEQUENCES
+The expect and reply strings may contain escape sequences. All of the
+sequences are legal in the reply string. Many are legal in the expect.
+Those which are not valid in the expect sequence are so indicated.
+.TP
+.B ''
+Expects or sends a null string. If you send a null string then it will still
+send the return character. This sequence may either be a pair of apostrophe
+or quote characters.
+.TP
+.B \\\\b
+represents a backspace character.
+.TP
+.B \\\\c
+Suppresses the newline at the end of the reply string. This is the only
+method to send a string without a trailing return character. It must
+be at the end of the send string. For example,
+the sequence hello\\c will simply send the characters h, e, l, l, o.
+.I (not valid in expect.)
+.TP
+.B \\\\d
+Delay for one second. The program uses sleep(1) which will delay to a
+maximum of one second.
+.I (not valid in expect.)
+.TP
+.B \\\\K
+Insert a BREAK
+.I (not valid in expect.)
+.TP
+.B \\\\n
+Send a newline or linefeed character.
+.TP
+.B \\\\N
+Send a null character. The same sequence may be represented by \\0.
+.I (not valid in expect.)
+.TP
+.B \\\\p
+Pause for a fraction of a second. The delay is 1/10th of a second.
+.I (not valid in expect.)
+.TP
+.B \\\\q
+Suppress writing the string to the SYSLOG file. The string ?????? is
+written to the log in its place.
+.I (not valid in expect.)
+.TP
+.B \\\\r
+Send or expect a carriage return.
+.TP
+.B \\\\s
+Represents a space character in the string. This may be used when it
+is not desirable to quote the strings which contains spaces. The
+sequence 'HI TIM' and HI\\sTIM are the same.
+.TP
+.B \\\\t
+Send or expect a tab character.
+.TP
+.B \\\\\\\\
+Send or expect a backslash character.
+.TP
+.B \\\\ddd
+Collapse the octal digits (ddd) into a single ASCII character and send that
+character.
+.I (some characters are not valid in expect.)
+.TP
+.B \^^C
+Substitute the sequence with the control character represented by C.
+For example, the character DC1 (17) is shown as \^^Q.
+.I (some characters are not valid in expect.)
+.SH SEE ALSO
+Additional information about \fIchat\fR scripts may be found with UUCP
+documentation. The \fIchat\fR script was taken from the ideas proposed by the
+scripts used by the \fIuucico\fR program.
+.LP
+uucico(1), uucp(1)
+.SH COPYRIGHT
+The \fIchat\fR program is in public domain. This is not the GNU public
+license. If it breaks then you get to keep both pieces.
diff --git a/usr.bin/chat/chat.c b/usr.bin/chat/chat.c
new file mode 100644
index 0000000..6c614d4
--- /dev/null
+++ b/usr.bin/chat/chat.c
@@ -0,0 +1,1166 @@
+/*
+ *	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 1.4 1994/05/30 00:30:37 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 */
+    }