/src/freebsd/usr.bin/tip/tip/tip.c
C | 627 lines | 435 code | 64 blank | 128 comment | 121 complexity | 74e2788363ac55d32752be2cbaa80429 MD5 | raw file
Possible License(s): CC0-1.0, MIT, LGPL-2.0, LGPL-3.0, WTFPL, GPL-2.0, BSD-2-Clause, AGPL-3.0, CC-BY-SA-3.0, MPL-2.0, JSON, BSD-3-Clause-No-Nuclear-License-2014, LGPL-2.1, CPL-1.0, AGPL-1.0, 0BSD, ISC, Apache-2.0, GPL-3.0, IPL-1.0, MPL-2.0-no-copyleft-exception, BSD-3-Clause
- /* $OpenBSD: tip.c,v 1.30 2006/08/18 03:06:18 jason 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.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #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";
- static const char rcsid[] = "$OpenBSD: tip.c,v 1.30 2006/08/18 03:06:18 jason Exp $";
- #endif
- #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 = NOSTR, 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 [-v] [-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 == NOSTR)
- 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")) == NOSTR)
- 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)(intptr_t)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);
- }
- /*
- * give up exclusive tty access
- */
- void
- unexcl()
- {
- ioctl(FD, TIOCNXCL, 0);
- }
- 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)
- {
- size_t 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 || errno == ENXIO)
- 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) == 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;
- }