4.4BSD/usr/src/usr.bin/tip/tip.c
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* tip - UNIX link to other systems
* tip [-v] [-speed] system-name
* or
* cu phone-number [-s speed] [-l line] [-a acu]
*/
#include "tip.h"
#include "pathnames.h"
/*
* Baud rate mapping table
*/
int bauds[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600,
1200, 1800, 2400, 4800, 9600, 19200, -1
};
int disc = OTTYDISC; /* tip normally runs this way */
void intprompt();
void timeout();
void cleanup();
char *sname();
char PNbuf[256]; /* This limits the size of a number */
main(argc, argv)
char *argv[];
{
char *system = NOSTR;
register int i;
register char *p;
char sbuf[12];
gid = getgid();
egid = getegid();
uid = getuid();
euid = geteuid();
if (equal(sname(argv[0]), "cu")) {
cumode = 1;
cumain(argc, argv);
goto cucommon;
}
if (argc > 4) {
fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
exit(1);
}
if (!isatty(0)) {
fprintf(stderr, "tip: must be interactive\n");
exit(1);
}
for (; argc > 1; argv++, argc--) {
if (argv[1][0] != '-')
system = argv[1];
else switch (argv[1][1]) {
case 'v':
vflag++;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
BR = atoi(&argv[1][1]);
break;
default:
fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
break;
}
}
if (system == NOSTR)
goto notnumber;
if (isalpha(*system))
goto notnumber;
/*
* System name is really a phone number...
* Copy the number then stomp on the original (in case the number
* is private, we don't want 'ps' or 'w' to find it).
*/
if (strlen(system) > sizeof PNbuf - 1) {
fprintf(stderr, "tip: phone number too long (max = %d bytes)\n",
sizeof PNbuf - 1);
exit(1);
}
strncpy( PNbuf, system, sizeof PNbuf - 1 );
for (p = system; *p; p++)
*p = '\0';
PN = PNbuf;
(void)sprintf(sbuf, "tip%d", BR);
system = sbuf;
notnumber:
(void)signal(SIGINT, cleanup);
(void)signal(SIGQUIT, cleanup);
(void)signal(SIGHUP, cleanup);
(void)signal(SIGTERM, cleanup);
if ((i = hunt(system)) == 0) {
printf("all ports busy\n");
exit(3);
}
if (i == -1) {
printf("link down\n");
(void)uu_unlock(uucplock);
exit(3);
}
setbuf(stdout, NULL);
loginit();
/*
* Kludge, their's no easy way to get the initialization
* in the right order, so force it here
*/
if ((PH = getenv("PHONES")) == NOSTR)
PH = _PATH_PHONES;
vinit(); /* init variables */
setparity("even"); /* set the parity table */
if ((i = speed(number(value(BAUDRATE)))) == NULL) {
printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
(void)uu_unlock(uucplock);
exit(3);
}
/*
* Now that we have the logfile and the ACU open
* return to the real uid and gid. These things will
* be closed on exit. Swap real and effective uid's
* so we can get the original permissions back
* for removing the uucp lock.
*/
user_uid();
/*
* Hardwired connections require the
* line speed set before they make any transmissions
* (this is particularly true of things like a DF03-AC)
*/
if (HW)
ttysetup(i);
if (p = connect()) {
printf("\07%s\n[EOT]\n", p);
daemon_uid();
(void)uu_unlock(uucplock);
exit(1);
}
if (!HW)
ttysetup(i);
cucommon:
/*
* From here down the code is shared with
* the "cu" version of tip.
*/
ioctl(0, TIOCGETP, (char *)&defarg);
ioctl(0, TIOCGETC, (char *)&defchars);
ioctl(0, TIOCGLTC, (char *)&deflchars);
ioctl(0, TIOCGETD, (char *)&odisc);
arg = defarg;
arg.sg_flags = ANYP | CBREAK;
tchars = defchars;
tchars.t_intrc = tchars.t_quitc = -1;
ltchars = deflchars;
ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
= ltchars.t_lnextc = -1;
raw();
pipe(fildes); pipe(repdes);
(void)signal(SIGALRM, timeout);
/*
* Everything's set up now:
* connection established (hardwired or dialup)
* line conditioned (baud rate, mode, etc.)
* internal data structures (variables)
* so, fork one process for local side and one for remote.
*/
printf(cumode ? "Connected\r\n" : "\07connected\r\n");
if (pid = fork())
tipin();
else
tipout();
/*NOTREACHED*/
}
void
cleanup()
{
daemon_uid();
(void)uu_unlock(uucplock);
if (odisc)
ioctl(0, TIOCSETD, (char *)&odisc);
exit(0);
}
/*
* Muck with user ID's. We are setuid to the owner of the lock
* directory when we start. user_uid() reverses real and effective
* ID's after startup, to run with the user's permissions.
* daemon_uid() switches back to the privileged uid for unlocking.
* Finally, to avoid running a shell with the wrong real uid,
* shell_uid() sets real and effective uid's to the user's real ID.
*/
static int uidswapped;
user_uid()
{
if (uidswapped == 0) {
seteuid(uid);
uidswapped = 1;
}
}
daemon_uid()
{
if (uidswapped) {
seteuid(euid);
uidswapped = 0;
}
}
shell_uid()
{
seteuid(uid);
}
/*
* put the controlling keyboard into raw mode
*/
raw()
{
ioctl(0, TIOCSETP, &arg);
ioctl(0, TIOCSETC, &tchars);
ioctl(0, TIOCSLTC, <chars);
ioctl(0, TIOCSETD, (char *)&disc);
}
/*
* return keyboard to normal mode
*/
unraw()
{
ioctl(0, TIOCSETD, (char *)&odisc);
ioctl(0, TIOCSETP, (char *)&defarg);
ioctl(0, TIOCSETC, (char *)&defchars);
ioctl(0, TIOCSLTC, (char *)&deflchars);
}
static jmp_buf promptbuf;
/*
* Print string ``s'', then read a string
* in from the terminal. Handles signals & allows use of
* normal erase and kill characters.
*/
prompt(s, p)
char *s;
register char *p;
{
register char *b = p;
sig_t oint, oquit;
stoprompt = 0;
oint = signal(SIGINT, intprompt);
oquit = signal(SIGQUIT, SIG_IGN);
unraw();
printf("%s", s);
if (setjmp(promptbuf) == 0)
while ((*p = getchar()) != EOF && *p != '\n')
p++;
*p = '\0';
raw();
(void)signal(SIGINT, oint);
(void)signal(SIGQUIT, oquit);
return (stoprompt || p == b);
}
/*
* Interrupt service routine during prompting
*/
void
intprompt()
{
(void)signal(SIGINT, SIG_IGN);
stoprompt = 1;
printf("\r\n");
longjmp(promptbuf, 1);
}
/*
* ****TIPIN TIPIN****
*/
tipin()
{
char gch, bol = 1;
/*
* Kinda klugey here...
* check for scripting being turned on from the .tiprc file,
* but be careful about just using setscript(), as we may
* send a SIGEMT before tipout has a chance to set up catching
* it; so wait a second, then setscript()
*/
if (boolean(value(SCRIPT))) {
sleep(1);
setscript();
}
while (1) {
gch = getchar()&0177;
if ((gch == character(value(ESCAPE))) && bol) {
if (!(gch = escape()))
continue;
} else if (!cumode && gch == character(value(RAISECHAR))) {
boolean(value(RAISE)) = !boolean(value(RAISE));
continue;
} else if (gch == '\r') {
bol = 1;
pwrite(FD, &gch, 1);
if (boolean(value(HALFDUPLEX)))
printf("\r\n");
continue;
} else if (!cumode && gch == character(value(FORCE)))
gch = getchar()&0177;
bol = any(gch, value(EOL));
if (boolean(value(RAISE)) && islower(gch))
gch = toupper(gch);
pwrite(FD, &gch, 1);
if (boolean(value(HALFDUPLEX)))
printf("%c", gch);
}
}
extern esctable_t etable[];
/*
* Escape handler --
* called on recognition of ``escapec'' at the beginning of a line
*/
escape()
{
register char gch;
register esctable_t *p;
char c = character(value(ESCAPE));
gch = (getchar()&0177);
for (p = etable; p->e_char; p++)
if (p->e_char == gch) {
if ((p->e_flags&PRIV) && uid)
continue;
printf("%s", ctrl(c));
(*p->e_func)(gch);
return (0);
}
/* ESCAPE ESCAPE forces ESCAPE */
if (c != gch)
pwrite(FD, &c, 1);
return (gch);
}
speed(n)
int n;
{
register int *p;
for (p = bauds; *p != -1; p++)
if (*p == n)
return (p - bauds);
return (NULL);
}
any(c, p)
register char c, *p;
{
while (p && *p)
if (*p++ == c)
return (1);
return (0);
}
size(s)
register char *s;
{
register int i = 0;
while (s && *s++)
i++;
return (i);
}
char *
interp(s)
register char *s;
{
static char buf[256];
register char *p = buf, c, *q;
while (c = *s++) {
for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
if (*q++ == c) {
*p++ = '\\'; *p++ = *q;
goto next;
}
if (c < 040) {
*p++ = '^'; *p++ = c + 'A'-1;
} else if (c == 0177) {
*p++ = '^'; *p++ = '?';
} else
*p++ = c;
next:
;
}
*p = '\0';
return (buf);
}
char *
ctrl(c)
char c;
{
static char s[3];
if (c < 040 || c == 0177) {
s[0] = '^';
s[1] = c == 0177 ? '?' : c+'A'-1;
s[2] = '\0';
} else {
s[0] = c;
s[1] = '\0';
}
return (s);
}
/*
* Help command
*/
help(c)
char c;
{
register esctable_t *p;
printf("%c\r\n", c);
for (p = etable; p->e_char; p++) {
if ((p->e_flags&PRIV) && uid)
continue;
printf("%2s", ctrl(character(value(ESCAPE))));
printf("%-2s %c %s\r\n", ctrl(p->e_char),
p->e_flags&EXP ? '*': ' ', p->e_help);
}
}
/*
* Set up the "remote" tty's state
*/
ttysetup(speed)
int speed;
{
unsigned bits = LDECCTQ;
arg.sg_ispeed = arg.sg_ospeed = speed;
arg.sg_flags = RAW;
if (boolean(value(TAND)))
arg.sg_flags |= TANDEM;
ioctl(FD, TIOCSETP, (char *)&arg);
ioctl(FD, TIOCLBIS, (char *)&bits);
}
/*
* Return "simple" name from a file name,
* strip leading directories.
*/
char *
sname(s)
register char *s;
{
register char *p = s;
while (*s)
if (*s++ == '/')
p = s;
return (p);
}
static char partab[0200];
static int bits8;
/*
* Do a write to the remote machine with the correct parity.
* We are doing 8 bit wide output, so we just generate a character
* with the right parity and output it.
*/
pwrite(fd, buf, n)
int fd;
char *buf;
register int n;
{
register int i;
register char *bp;
extern int errno;
bp = buf;
if (bits8 == 0)
for (i = 0; i < n; i++) {
*bp = partab[(*bp) & 0177];
bp++;
}
if (write(fd, buf, n) < 0) {
if (errno == EIO)
tipabort("Lost carrier.");
/* this is questionable */
perror("write");
}
}
/*
* Build a parity table with appropriate high-order bit.
*/
setparity(defparity)
char *defparity;
{
register int i, flip, clr, set;
char *parity;
extern char evenpartab[];
if (value(PARITY) == NOSTR)
value(PARITY) = defparity;
parity = value(PARITY);
if (equal(parity, "none")) {
bits8 = 1;
return;
}
bits8 = 0;
flip = 0;
clr = 0377;
set = 0;
if (equal(parity, "odd"))
flip = 0200; /* reverse bit 7 */
else if (equal(parity, "zero"))
clr = 0177; /* turn off bit 7 */
else if (equal(parity, "one"))
set = 0200; /* turn on bit 7 */
else if (!equal(parity, "even")) {
(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
(void) fflush(stderr);
}
for (i = 0; i < 0200; i++)
partab[i] = evenpartab[i] ^ flip | set & clr;
}