NetBSD-5.0.2/usr.bin/tip/tip.c
/* $NetBSD: tip.c,v 1.49 2008/07/21 14:19:26 lukem 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.
*/
#include <sys/cdefs.h>
#include <ctype.h>
#include <libgen.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: tip.c,v 1.49 2008/07/21 14:19:26 lukem Exp $");
#endif /* not lint */
/*
* tip - UNIX link to other systems
* tip [-v] [-speed] system-name
* or
* cu [options] [phone-number|"dir"]
*/
#include "tip.h"
#include "pathnames.h"
static void tipusage(void);
int escape(void);
int main(int, char **);
void intprompt(int);
void tipin(void);
char PNbuf[256]; /* This limits the size of a number */
static char path_phones[] = _PATH_PHONES;
int
main(int argc, char *argv[])
{
char *System = NULL;
int c, i;
char *p;
const char *q;
char sbuf[12];
static char brbuf[16];
int fcarg;
gid = getgid();
egid = getegid();
uid = getuid();
euid = geteuid();
if (equal(basename(argv[0]), "cu")) {
cumode = 1;
cumain(argc, argv);
goto cucommon;
}
if (argc > 4) {
tipusage();
}
if (!isatty(0)) {
(void)fprintf(stderr, "%s: must be interactive\n", getprogname());
exit(1);
}
while((c = getopt(argc, argv, "v0123456789")) != -1) {
switch(c) {
case 'v':
vflag++;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
(void)snprintf(brbuf, sizeof(brbuf) -1, "%s%c", brbuf, c);
BR = atoi(brbuf);
break;
default:
warnx("%s, unknown option", argv[1]);
break;
}
}
argc -= optind;
argv += optind;
if (argc != 1)
tipusage();
else
System = argv[0];
if (System == NULL)
goto notnumber;
if (isalpha((unsigned char)*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) {
errx(1, "phone number too long (max = %d bytes)",
(int)sizeof(PNbuf) - 1);
}
(void)strlcpy(PNbuf, System, sizeof(PNbuf));
for (p = System; *p; p++)
*p = '\0';
PN = PNbuf;
(void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)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) {
(void)printf("all ports busy\n");
exit(3);
}
if (i == -1) {
errx(3, "link down\n");
}
setbuf(stdout, NULL);
/*
* 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) {
if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
errx(3, "bad baud rate %d",
(int)number(value(BAUDRATE)));
}
}
if ((q = tip_connect()) != NULL) {
errx(1, "\07%s\n[EOT]\n", q);
}
if (!HW) {
if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
errx(3, "bad baud rate %d",
(int)number(value(BAUDRATE)));
}
}
cucommon:
/*
* From here down the code is shared with
* the "cu" version of tip.
*/
/*
* Direct connections with no carrier require using O_NONBLOCK on
* open, but we don't want to keep O_NONBLOCK after open because it
* will cause busy waits.
*/
if (DC &&
((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
err(1, "can't clear O_NONBLOCK");
}
(void)tcgetattr(0, &defterm);
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();
(void)pipe(attndes);
(void)pipe(fildes);
(void)pipe(repdes);
(void)signal(SIGALRM, alrmtimeout);
/*
* 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.
*/
(void)printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
switch (pid = fork()) {
default:
tipin();
break;
case 0:
tipout();
break;
case -1:
err(1, "can't fork");
}
/*NOTREACHED*/
exit(0); /* XXX: pacify gcc */
}
void
tipusage(void)
{
(void)fprintf(stderr, "usage: %s [-v] [-speed] system-name\n",
getprogname());
(void)fprintf(stderr, " %s [-v] [-speed] phone-number\n",
getprogname());
exit(1);
}
void
/*ARGSUSED*/
cleanup(int dummy __unused)
{
if (odisc)
(void)ioctl(0, TIOCSETD, &odisc);
exit(0);
}
/*
* put the controlling keyboard into raw mode
*/
void
raw(void)
{
(void)tcsetattr(0, TCSADRAIN, &term);
}
/*
* return keyboard to normal mode
*/
void
unraw(void)
{
(void)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(const char *s, char *volatile p, size_t l)
{
int c;
char *b = p;
sig_t oint, oquit;
stoprompt = 0;
oint = signal(SIGINT, intprompt);
oquit = signal(SIGQUIT, SIG_IGN);
unraw();
(void)printf("%s", s);
if (setjmp(promptbuf) == 0)
while ((c = getchar()) != -1 && (*p = c) != '\n' &&
b + l > p)
p++;
*p = '\0';
raw();
(void)signal(SIGINT, oint);
(void)signal(SIGQUIT, oquit);
return (stoprompt || p == b);
}
/*
* Interrupt service routine during prompting
*/
void
/*ARGSUSED*/
intprompt(int dummy __unused)
{
(void)signal(SIGINT, SIG_IGN);
stoprompt = 1;
(void)printf("\r\n");
longjmp(promptbuf, 1);
}
/*
* ****TIPIN TIPIN****
*/
void
tipin(void)
{
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))) {
(void)sleep(1);
setscript();
}
for (;;) {
gch = getchar()&STRIP_PAR;
if ((gch == character(value(ESCAPE))) && bol) {
if (!(gch = escape()))
continue;
} else if (!cumode &&
gch && gch == character(value(RAISECHAR))) {
setboolean(value(RAISE), !boolean(value(RAISE)));
continue;
} else if (gch == '\r') {
bol = 1;
xpwrite(FD, &gch, 1);
if (boolean(value(HALFDUPLEX)))
(void)printf("\r\n");
continue;
} else if (!cumode && gch && gch == character(value(FORCE)))
gch = getchar()&STRIP_PAR;
bol = any(gch, value(EOL));
if (boolean(value(RAISE)) && islower((unsigned char)gch))
gch = toupper((unsigned char)gch);
xpwrite(FD, &gch, 1);
if (boolean(value(HALFDUPLEX)))
(void)printf("%c", gch);
}
}
/*
* Escape handler --
* called on recognition of ``escapec'' at the beginning of a line
*/
int
escape(void)
{
char gch;
esctable_t *p;
char c = character(value(ESCAPE));
gch = (getchar()&STRIP_PAR);
for (p = etable; p->e_char; p++)
if (p->e_char == gch) {
if ((p->e_flags&PRIV) && uid)
continue;
(void)printf("%s", ctrl(c));
(*p->e_func)(gch);
return (0);
}
/* ESCAPE ESCAPE forces ESCAPE */
if (c != gch)
xpwrite(FD, &c, 1);
return (gch);
}
int
any(char c, const char *p)
{
while (p && *p)
if (*p++ == c)
return (1);
return (0);
}
char *
interp(const char *s)
{
static char buf[256];
char *p = buf, c;
const char *q;
while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
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(char c)
{
esctable_t *p;
(void)printf("%c\r\n", c);
for (p = etable; p->e_char; p++) {
if ((p->e_flags&PRIV) && uid)
continue;
(void)printf("%2s", ctrl(character(value(ESCAPE))));
(void)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(speed_t spd)
{
struct termios cntrl;
(void)tcgetattr(FD, &cntrl);
(void)cfsetospeed(&cntrl, spd);
(void)cfsetispeed(&cntrl, spd);
cntrl.c_cflag &= ~(CSIZE|PARENB);
cntrl.c_cflag |= CS8;
if (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
xpwrite(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 */
warn("write");
}
}
/*
* Build a parity table with appropriate high-order bit.
*/
void
setparity(const char *defparity)
{
int i, flip, clr, set;
const char *parity;
static char *curpar;
if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') {
if (curpar != NULL)
free(curpar);
value(PARITY) = curpar = strdup(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;
}