OpenSolaris_b135/cmd/tip/tip.c
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
/*
* 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 <sys/wait.h>
#include <locale.h>
/*
* Baud rate mapping table
*/
int bauds[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600,
1200, 1800, 2400, 4800, 9600, 19200, 38400,
57600, 76800, 115200, 153600, 230400, 307200,
460800, 921600, -1
};
extern void tipout(void) __NORETURN;
extern void timeout(void);
extern esctable_t etable[];
extern unsigned char evenpartab[];
void intprompt(void);
void deadkid(void);
void cleanup(void);
void tipin(void) __NORETURN;
unsigned char escape(void);
char *sname(char *);
char PNbuf[256]; /* This limits the size of a number */
int noparity = 0;
int
main(int argc, char *argv[])
{
char *system = NOSTR;
int i;
char *p;
char sbuf[15];
gid = getgid();
egid = getegid();
uid = getuid();
euid = geteuid();
if (equal(sname(argv[0]), "cu")) {
cumode = 1;
cumain(argc, argv);
goto cucommon;
}
if (argc > 4) {
(void) fprintf(stderr,
"usage: tip [-v] [-speed] [system-name]\n");
return (1);
}
if (!isatty(0)) {
(void) fprintf(stderr, "tip: must be interactive\n");
return (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:
(void) fprintf(stderr, "tip: %s, unknown option\n",
argv[1]);
break;
}
}
(void) setlocale(LC_CTYPE, "");
if (system == NOSTR)
goto notnumber;
for (p = system; *p; p++)
if (isalpha(*p))
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) {
(void) fprintf(stderr,
"tip: phone number too long (max = %d bytes)\n",
sizeof (PNbuf) - 1);
return (1);
}
(void) strncpy(PNbuf, system, sizeof (PNbuf) - 1);
for (p = system; *p; p++)
*p = '\0';
PN = PNbuf;
(void) snprintf(sbuf, sizeof (sbuf), "tip%d", BR);
system = sbuf;
notnumber:
(void) signal(SIGINT, (sig_handler_t)cleanup);
(void) signal(SIGQUIT, (sig_handler_t)cleanup);
(void) signal(SIGHUP, (sig_handler_t)cleanup);
(void) signal(SIGTERM, (sig_handler_t)cleanup);
if ((i = hunt(system)) == 0) {
(void) printf("all ports busy\n");
return (3);
}
if (i == -1) {
(void) printf("link down\n");
delock(uucplock);
return (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. The saved-setuid uid and gid
* allows us to get the original setuid permissions back
* for removing the uucp lock.
*/
userperm();
/*
* Kludge, there's no easy way to get the initialization
* in the right order, so force it here.
* Do the open here, before we change back to real uid.
* We will check whether the open succeeded later, when
* (and if) we actually go to use the file.
*/
if ((PH = getenv("PHONES")) == NOSTR) {
myperm();
PH = "/etc/phones";
}
phfd = fopen(PH, "r");
userperm();
vinit(); /* init variables */
setparity("none"); /* set the parity table */
if ((i = speed(number(value(BAUDRATE)))) == NULL) {
(void) printf("tip: bad baud rate %d\n",
number(value(BAUDRATE)));
myperm();
delock(uucplock);
return (3);
}
/*
* 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()) {
(void) printf("\07%s\n[EOT]\n", p);
myperm();
delock(uucplock);
return (1);
}
/*
* Always setup the tty again here in case hardware flow
* control was selected, which can only be set after the
* connection is made, or in case this is not a hardwired
* modem (rare these days) that likewise can only be setup
* after the connection is made.
*/
ttysetup(i);
cucommon:
/*
* From here down the code is shared with
* the "cu" version of tip.
*/
(void) ioctl(0, TCGETS, (char *)&defarg);
arg = defarg;
/* turn off input processing */
arg.c_lflag &= ~(ICANON|ISIG|ECHO|IEXTEN);
arg.c_cc[VMIN] = 1;
arg.c_cc[VTIME] = 0;
arg.c_iflag &= ~(INPCK|IXON|IXOFF|ICRNL);
arg.c_oflag = 0; /* turn off all output processing */
/* handle tandem mode in case was set in remote file */
if (boolean(value(TAND)))
tandem("on");
else
tandem("off");
raw();
(void) pipe(fildes); (void) pipe(repdes);
(void) signal(SIGALRM, (sig_handler_t)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.
*/
if (CM != NOSTR) {
(void) sleep(2); /* let line settle */
parwrite(FD, (unsigned char *)CM, strlen(CM));
}
(void) printf(cumode ? "Connected\r\n" : "\07connected\r\n");
(void) signal(SIGCHLD, (sig_handler_t)deadkid);
if (pid = fork())
tipin();
else
tipout();
/*NOTREACHED*/
}
void
deadkid(void)
{
if (pid >= 0 && waitpid(pid, NULL, WNOHANG) == pid)
tip_abort("Connection Closed");
}
void
cleanup(void)
{
if (uid != getuid()) {
myperm();
}
delock(uucplock);
exit(0);
}
/*
* put the controlling keyboard into raw mode
*/
void
raw(void)
{
(void) ioctl(0, TCSETSF, (char *)&arg);
}
/*
* return keyboard to normal mode
*/
void
unraw(void)
{
(void) ioctl(0, TCSETSF, (char *)&defarg);
}
/*
* switch to using invoking user's permissions
*/
void
userperm(void)
{
(void) setegid(gid);
(void) seteuid(uid);
}
/*
* switch to using my special (setuid) permissions
*/
void
myperm(void)
{
(void) setegid(egid);
(void) seteuid(euid);
}
static sigjmp_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 len)
{
char *b = p;
int c;
sig_handler_t ointr, oquit;
stoprompt = 0;
ointr = signal(SIGINT, (sig_handler_t)intprompt);
oquit = signal(SIGQUIT, SIG_IGN);
unraw();
(void) printf("%s", s);
if (sigsetjmp(promptbuf, 1) == 0)
while (p < b + len - 1 &&
((c = getchar()) != EOF) && (c != '\n'))
*p++ = c;
*p = '\0';
raw();
(void) signal(SIGINT, ointr);
(void) signal(SIGQUIT, oquit);
return (stoprompt || p == b);
}
/*
* Interrupt service routine during prompting
*/
void
intprompt(void)
{
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
stoprompt = 1;
(void) printf("\r\n");
siglongjmp(promptbuf, 1);
}
/*
* ****TIPIN TIPIN****
*/
void
tipin(void)
{
unsigned char gch, c;
int 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()&0377;
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;
parwrite(FD, &gch, 1);
if (boolean(value(HALFDUPLEX)))
(void) printf("\r\n");
continue;
} else if (!cumode && gch == character(value(FORCE)))
gch = getchar()&0377;
bol = any(gch, value(EOL));
if (boolean(value(RAISE)) && islower(gch))
gch = toupper(gch);
c = gch;
parwrite(FD, &gch, 1);
if (boolean(value(HALFDUPLEX)))
(void) putchar(c);
}
}
/*
* Escape handler --
* called on recognition of ``escapec'' at the beginning of a line
*/
unsigned char
escape(void)
{
unsigned char gch;
esctable_t *p;
char c = character(value(ESCAPE));
gch = (getchar()&0377);
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)
parwrite(FD, (unsigned char *)&c, 1);
return (gch);
}
int
speed(int n)
{
int *p;
for (p = bauds; *p != -1; p++)
if (*p == n)
return (p - bauds);
return (0);
}
int
any(char c, char *p)
{
while (p && *p)
if (*p++ == c)
return (1);
return (0);
}
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;
(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
*/
void
ttysetup(int speed)
{
struct termios buf;
char *loc;
(void) ioctl(FD, TCGETS, (char *)&buf);
buf.c_cflag &= (CREAD|HUPCL|CLOCAL|CRTSCTS|CRTSXOFF);
buf.c_cflag |= CS8;
(void) cfsetospeed(&buf, speed);
if (boolean(value(HARDWAREFLOW))) {
int i = TIOCM_CAR;
/*
* Only set hardware flow control if carrier is up,
* because some devices require both CD and RTS to
* be up before sending.
*/
(void) ioctl(FD, TIOCMGET, &i);
if (i & TIOCM_CAR)
buf.c_cflag |= (CRTSCTS|CRTSXOFF);
}
/*
* Careful to only penalize the 8-bit users here on the
* incoming tty port. The default 7-bit users will
* still get the parity bit from the other side's login
* process (which happens to be the default for sun tip
* configurations).
*/
loc = setlocale(LC_CTYPE, NULL);
if (noparity && loc != 0 && strcmp(loc, "C") != 0)
buf.c_iflag = 0;
else
buf.c_iflag = ISTRIP;
buf.c_oflag = 0;
buf.c_lflag = 0;
buf.c_cc[VMIN] = 1;
buf.c_cc[VTIME] = 0;
(void) ioctl(FD, TCSETSF, (char *)&buf);
}
/*
* Return "simple" name from a file name,
* strip leading directories.
*/
char *
sname(char *s)
{
char *p = s;
while (*s)
if (*s++ == '/')
p = s;
return (p);
}
static char partab[0400];
/*
* 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, unsigned char *buf, int n)
{
int i;
unsigned char *bp;
bp = buf;
for (i = 0; i < n; i++) {
*bp = partab[(*bp)&0377];
bp++;
}
if (write(fd, buf, n) < 0) {
if (errno == EIO || errno == ENXIO)
tip_abort("Lost carrier.");
/* this is questionable */
perror("write");
}
}
/*
* Build a parity table with appropriate high-order bit.
*/
void
setparity(char *defparity)
{
int i;
char *parity;
if (value(PARITY) == NOSTR)
value(PARITY) = defparity;
parity = value(PARITY);
for (i = 0; i < 0400; i++)
partab[i] = evenpartab[i];
if (equal(parity, "even")) {
/* EMPTY */
} else if (equal(parity, "odd")) {
for (i = 0; i < 0400; i++)
partab[i] ^= 0200; /* reverse bit 7 */
} else if (equal(parity, "none")) {
/* Do nothing so we can pass thru 8-bit chars */
noparity = 1;
for (i = 0; i < 0400; i++)
partab[i] = i;
} else if (equal(parity, "zero")) {
for (i = 0; i < 0400; i++)
partab[i] &= ~0200; /* turn off bit 7 */
} else if (equal(parity, "one")) {
for (i = 0; i < 0400; i++)
partab[i] |= 0200; /* turn on bit 7 */
} else {
(void) fprintf(stderr, "%s: unknown parity value\n", PA);
(void) fflush(stderr);
}
}