OpenBSD-4.6/usr.bin/tip/tip.c
/* $OpenBSD: tip.c,v 1.34 2008/06/01 18:38:29 sobrado Exp $ */
/* $NetBSD: tip.c,v 1.13 1997/04/20 00:03:05 mellon Exp $ */
/*
* 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. 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 const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] = "$OpenBSD: tip.c,v 1.34 2008/06/01 18:38:29 sobrado Exp $";
#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"
int disc = TTYDISC; /* tip normally runs this way */
char PNbuf[256]; /* This limits the size of a number */
static void intprompt(int);
static void tipin(void);
static int escape(void);
int
main(int argc, char *argv[])
{
char *sys = NULL, sbuf[12], *p;
int i;
/* XXX preserve previous braindamaged behavior */
setboolean(value(DC), TRUE);
gid = getgid();
egid = getegid();
uid = getuid();
euid = geteuid();
if (equal(__progname, "cu")) {
cumode = 1;
cumain(argc, argv);
goto cucommon;
}
if (argc > 4) {
fprintf(stderr, "usage: tip [-nv] [-speed] [system-name]\n");
exit(1);
}
if (!isatty(0)) {
fprintf(stderr, "%s: must be interactive\n", __progname);
exit(1);
}
for (; argc > 1; argv++, argc--) {
if (argv[1][0] != '-')
sys = argv[1];
else switch (argv[1][1]) {
case 'v':
vflag++;
break;
case 'n':
noesc++;
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, "%s: %s, unknown option\n", __progname,
argv[1]);
break;
}
}
if (sys == NULL)
goto notnumber;
if (isalpha(*sys))
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(sys) > sizeof PNbuf - 1) {
fprintf(stderr, "%s: phone number too long (max = %d bytes)\n",
__progname, (int)sizeof(PNbuf) - 1);
exit(1);
}
strlcpy(PNbuf, sys, sizeof PNbuf - 1);
for (p = sys; *p; p++)
*p = '\0';
PN = PNbuf;
(void)snprintf(sbuf, sizeof(sbuf), "tip%ld", BR);
sys = sbuf;
notnumber:
(void)signal(SIGINT, cleanup);
(void)signal(SIGQUIT, cleanup);
(void)signal(SIGHUP, cleanup);
(void)signal(SIGTERM, cleanup);
(void)signal(SIGCHLD, SIG_DFL);
if ((i = hunt(sys)) == 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();
/*
* 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();
/*
* Kludge, their's no easy way to get the initialization
* in the right order, so force it here
*/
if ((PH = getenv("PHONES")) == NULL)
PH = _PATH_PHONES;
vinit(); /* init variables */
setparity("none"); /* set the parity table */
/*
* 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(number(value(BAUDRATE)))) {
fprintf(stderr, "%s: bad baud rate %ld\n", __progname,
number(value(BAUDRATE)));
daemon_uid();
(void)uu_unlock(uucplock);
exit(3);
}
if ((p = con())) {
printf("\07%s\n[EOT]\n", p);
daemon_uid();
(void)uu_unlock(uucplock);
exit(1);
}
if (!HW && ttysetup(number(value(BAUDRATE)))) {
fprintf(stderr, "%s: bad baud rate %ld\n", __progname,
number(value(BAUDRATE)));
daemon_uid();
(void)uu_unlock(uucplock);
exit(3);
}
cucommon:
/*
* From here down the code is shared with
* the "cu" version of tip.
*/
i = fcntl(FD, F_GETFL);
if (i == -1) {
perror("fcntl");
cleanup(0);
}
i = fcntl(FD, F_SETFL, i & ~O_NONBLOCK);
if (i == -1) {
perror("fcntl");
cleanup(0);
}
tcgetattr(0, &defterm);
gotdefterm = 1;
term = defterm;
term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
term.c_iflag &= ~(INPCK|ICRNL);
term.c_oflag &= ~OPOST;
term.c_cc[VMIN] = 1;
term.c_cc[VTIME] = 0;
defchars = term;
term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
term.c_cc[VLNEXT] = _POSIX_VDISABLE;
raw();
pipe(fildes); pipe(repdes);
(void)signal(SIGALRM, timeout);
if (value(LINEDISC) != TTYDISC) {
int ld = (int)value(LINEDISC);
ioctl(FD, TIOCSETD, &ld);
}
/*
* 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");
tipin_pid = getpid();
if ((tipout_pid = fork()))
tipin();
else
tipout();
/*NOTREACHED*/
exit(0);
}
void
cleanup(int signo)
{
daemon_uid();
(void)uu_unlock(uucplock);
if (odisc)
ioctl(0, TIOCSETD, &odisc);
unraw();
if (signo && tipout_pid) {
kill(tipout_pid, signo);
wait(NULL);
}
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;
void
user_uid(void)
{
if (uidswapped == 0) {
seteuid(uid);
uidswapped = 1;
}
}
void
daemon_uid(void)
{
if (uidswapped) {
seteuid(euid);
uidswapped = 0;
}
}
void
shell_uid(void)
{
setegid(gid);
seteuid(uid);
}
/*
* put the controlling keyboard into raw mode
*/
void
raw(void)
{
tcsetattr(0, TCSADRAIN, &term);
}
/*
* return keyboard to normal mode
*/
void
unraw(void)
{
if (gotdefterm)
tcsetattr(0, TCSADRAIN, &defterm);
}
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.
*/
int
prompt(char *s, char *p, size_t sz)
{
int c;
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 ((c = getchar()) != EOF && (*p = c) != '\n' && --sz > 0)
p++;
*p = '\0';
raw();
(void)signal(SIGINT, oint);
(void)signal(SIGQUIT, oquit);
return (stoprompt || p == b);
}
/*
* Interrupt service routine during prompting
*/
/*ARGSUSED*/
static void
intprompt(int signo)
{
(void)signal(SIGINT, SIG_IGN);
stoprompt = 1;
printf("\r\n");
longjmp(promptbuf, 1);
}
/*
* ****TIPIN TIPIN****
*/
static void
tipin(void)
{
int bol = 1;
int gch;
char ch;
/*
* 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()&STRIP_PAR;
/* XXX does not check for EOF */
if ((gch == character(value(ESCAPE))) && bol) {
if (!noesc) {
if (!(gch = escape()))
continue;
}
} else if (!cumode && gch == character(value(RAISECHAR))) {
setboolean(value(RAISE), !boolean(value(RAISE)));
continue;
} else if (gch == '\r') {
bol = 1;
ch = gch;
parwrite(FD, &ch, 1);
if (boolean(value(HALFDUPLEX)))
printf("\r\n");
continue;
} else if (!cumode && gch == character(value(FORCE)))
gch = getchar()&STRIP_PAR;
bol = any(gch, value(EOL));
if (boolean(value(RAISE)) && islower(gch))
gch = toupper(gch);
ch = gch;
parwrite(FD, &ch, 1);
if (boolean(value(HALFDUPLEX)))
printf("%c", ch);
}
}
extern esctable_t etable[];
/*
* Escape handler --
* called on recognition of ``escapec'' at the beginning of a line
*/
static int
escape(void)
{
int gch;
esctable_t *p;
char c = character(value(ESCAPE));
gch = (getchar()&STRIP_PAR);
/* XXX does not check for EOF */
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)
parwrite(FD, &c, 1);
return (gch);
}
int
any(int cc, char *p)
{
char c = cc;
while (p && *p)
if (*p++ == c)
return (1);
return (0);
}
size_t
size(char *s)
{
size_t i = 0;
while (s && *s++)
i++;
return (i);
}
char *
interp(char *s)
{
static char buf[256];
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(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
*/
void
help(int c)
{
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
*/
int
ttysetup(int speed)
{
struct termios cntrl;
if (tcgetattr(FD, &cntrl))
return (-1);
cfsetspeed(&cntrl, speed);
cntrl.c_cflag &= ~(CSIZE|PARENB);
cntrl.c_cflag |= CS8;
if (boolean(value(DC)))
cntrl.c_cflag |= CLOCAL;
if (boolean(value(HARDWAREFLOW)))
cntrl.c_cflag |= CRTSCTS;
cntrl.c_iflag &= ~(ISTRIP|ICRNL);
cntrl.c_oflag &= ~OPOST;
cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
cntrl.c_cc[VMIN] = 1;
cntrl.c_cc[VTIME] = 0;
if (boolean(value(TAND)))
cntrl.c_iflag |= IXOFF;
return (tcsetattr(FD, TCSAFLUSH, &cntrl));
}
static char partab[0200];
/*
* 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.
*/
void
parwrite(int fd, char *buf, size_t n)
{
int i;
char *bp;
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.
*/
void
setparity(char *defparity)
{
int i, flip, clr, set;
char *parity;
extern const unsigned char evenpartab[];
if (value(PARITY) == NULL)
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;
}