4.4BSD/usr/src/libexec/getty/main.c
/*-
* Copyright (c) 1980, 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) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/20/93";
#endif /* not lint */
#define USE_OLD_TTY
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <ctype.h>
#include <ctype.h>
#include <fcntl.h>
#include <setjmp.h>
#include <sgtty.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include "gettytab.h"
#include "pathnames.h"
#include "extern.h"
/*
* Set the amount of running time that getty should accumulate
* before deciding that something is wrong and exit.
*/
#define GETTY_TIMEOUT 60 /* seconds */
struct sgttyb tmode = {
0, 0, CERASE, CKILL, 0
};
struct tchars tc = {
CINTR, CQUIT, CSTART,
CSTOP, CEOF, CBRK,
};
struct ltchars ltc = {
CSUSP, CDSUSP, CRPRNT,
CFLUSH, CWERASE, CLNEXT
};
int crmod, digit, lower, upper;
char hostname[MAXHOSTNAMELEN];
char name[16];
char dev[] = _PATH_DEV;
char ttyn[32];
char *portselector();
char *ttyname();
#define OBUFSIZ 128
#define TABBUFSIZ 512
char defent[TABBUFSIZ];
char tabent[TABBUFSIZ];
char *env[128];
char partab[] = {
0001,0201,0201,0001,0201,0001,0001,0201,
0202,0004,0003,0205,0005,0206,0201,0001,
0201,0001,0001,0201,0001,0201,0201,0001,
0001,0201,0201,0001,0201,0001,0001,0201,
0200,0000,0000,0200,0000,0200,0200,0000,
0000,0200,0200,0000,0200,0000,0000,0200,
0000,0200,0200,0000,0200,0000,0000,0200,
0200,0000,0000,0200,0000,0200,0200,0000,
0200,0000,0000,0200,0000,0200,0200,0000,
0000,0200,0200,0000,0200,0000,0000,0200,
0000,0200,0200,0000,0200,0000,0000,0200,
0200,0000,0000,0200,0000,0200,0200,0000,
0000,0200,0200,0000,0200,0000,0000,0200,
0200,0000,0000,0200,0000,0200,0200,0000,
0200,0000,0000,0200,0000,0200,0200,0000,
0000,0200,0200,0000,0200,0000,0000,0201
};
#define ERASE tmode.sg_erase
#define KILL tmode.sg_kill
#define EOT tc.t_eofc
jmp_buf timeout;
static void
dingdong()
{
alarm(0);
signal(SIGALRM, SIG_DFL);
longjmp(timeout, 1);
}
jmp_buf intrupt;
static void
interrupt()
{
signal(SIGINT, interrupt);
longjmp(intrupt, 1);
}
/*
* Action to take when getty is running too long.
*/
void
timeoverrun(signo)
int signo;
{
syslog(LOG_ERR, "getty exiting due to excessive running time\n");
exit(1);
}
static int getname __P((void));
static void oflush __P((void));
static void prompt __P((void));
static void putchr __P((int));
static void putf __P((char *));
static void putpad __P((char *));
static void puts __P((char *));
int
main(argc, argv)
int argc;
char *argv[];
{
extern char **environ;
char *tname;
long allflags;
int repcnt = 0;
struct rlimit limit;
signal(SIGINT, SIG_IGN);
/*
signal(SIGQUIT, SIG_DFL);
*/
openlog("getty", LOG_ODELAY|LOG_CONS, LOG_AUTH);
gethostname(hostname, sizeof(hostname));
if (hostname[0] == '\0')
strcpy(hostname, "Amnesiac");
/*
* Limit running time to deal with broken or dead lines.
*/
(void)signal(SIGXCPU, timeoverrun);
limit.rlim_max = RLIM_INFINITY;
limit.rlim_cur = GETTY_TIMEOUT;
(void)setrlimit(RLIMIT_CPU, &limit);
/*
* The following is a work around for vhangup interactions
* which cause great problems getting window systems started.
* If the tty line is "-", we do the old style getty presuming
* that the file descriptors are already set up for us.
* J. Gettys - MIT Project Athena.
*/
if (argc <= 2 || strcmp(argv[2], "-") == 0)
strcpy(ttyn, ttyname(0));
else {
int i;
strcpy(ttyn, dev);
strncat(ttyn, argv[2], sizeof(ttyn)-sizeof(dev));
if (strcmp(argv[0], "+") != 0) {
chown(ttyn, 0, 0);
chmod(ttyn, 0600);
revoke(ttyn);
/*
* Delay the open so DTR stays down long enough to be detected.
*/
sleep(2);
while ((i = open(ttyn, O_RDWR)) == -1) {
if (repcnt % 10 == 0) {
syslog(LOG_ERR, "%s: %m", ttyn);
closelog();
}
repcnt++;
sleep(60);
}
login_tty(i);
}
}
gettable("default", defent);
gendefaults();
tname = "default";
if (argc > 1)
tname = argv[1];
for (;;) {
int off;
gettable(tname, tabent);
if (OPset || EPset || APset)
APset++, OPset++, EPset++;
setdefaults();
off = 0;
ioctl(0, TIOCFLUSH, &off); /* clear out the crap */
ioctl(0, FIONBIO, &off); /* turn off non-blocking mode */
ioctl(0, FIOASYNC, &off); /* ditto for async mode */
if (IS)
tmode.sg_ispeed = speed(IS);
else if (SP)
tmode.sg_ispeed = speed(SP);
if (OS)
tmode.sg_ospeed = speed(OS);
else if (SP)
tmode.sg_ospeed = speed(SP);
tmode.sg_flags = setflags(0);
ioctl(0, TIOCSETP, &tmode);
setchars();
ioctl(0, TIOCSETC, &tc);
if (HC)
ioctl(0, TIOCHPCL, 0);
if (AB) {
extern char *autobaud();
tname = autobaud();
continue;
}
if (PS) {
tname = portselector();
continue;
}
if (CL && *CL)
putpad(CL);
edithost(HE);
if (IM && *IM)
putf(IM);
if (setjmp(timeout)) {
tmode.sg_ispeed = tmode.sg_ospeed = 0;
ioctl(0, TIOCSETP, &tmode);
exit(1);
}
if (TO) {
signal(SIGALRM, dingdong);
alarm(TO);
}
if (getname()) {
register int i;
oflush();
alarm(0);
signal(SIGALRM, SIG_DFL);
if (name[0] == '-') {
puts("user names may not start with '-'.");
continue;
}
if (!(upper || lower || digit))
continue;
allflags = setflags(2);
tmode.sg_flags = allflags & 0xffff;
allflags >>= 16;
if (crmod || NL)
tmode.sg_flags |= CRMOD;
if (upper || UC)
tmode.sg_flags |= LCASE;
if (lower || LC)
tmode.sg_flags &= ~LCASE;
ioctl(0, TIOCSETP, &tmode);
ioctl(0, TIOCSLTC, <c);
ioctl(0, TIOCLSET, &allflags);
signal(SIGINT, SIG_DFL);
for (i = 0; environ[i] != (char *)0; i++)
env[i] = environ[i];
makeenv(&env[i]);
/*
* this is what login was doing anyway.
* soon we rewrite getty completely.
*/
set_ttydefaults(0);
limit.rlim_max = RLIM_INFINITY;
limit.rlim_cur = RLIM_INFINITY;
(void)setrlimit(RLIMIT_CPU, &limit);
execle(LO, "login", "-p", name, (char *) 0, env);
syslog(LOG_ERR, "%s: %m", LO);
exit(1);
}
alarm(0);
signal(SIGALRM, SIG_DFL);
signal(SIGINT, SIG_IGN);
if (NX && *NX)
tname = NX;
}
}
static int
getname()
{
register int c;
register char *np;
char cs;
/*
* Interrupt may happen if we use CBREAK mode
*/
if (setjmp(intrupt)) {
signal(SIGINT, SIG_IGN);
return (0);
}
signal(SIGINT, interrupt);
tmode.sg_flags = setflags(0);
ioctl(0, TIOCSETP, &tmode);
tmode.sg_flags = setflags(1);
prompt();
if (PF > 0) {
oflush();
sleep(PF);
PF = 0;
}
ioctl(0, TIOCSETP, &tmode);
crmod = digit = lower = upper = 0;
np = name;
for (;;) {
oflush();
if (read(STDIN_FILENO, &cs, 1) <= 0)
exit(0);
if ((c = cs&0177) == 0)
return (0);
if (c == EOT)
exit(1);
if (c == '\r' || c == '\n' || np >= &name[sizeof name]) {
putf("\r\n");
break;
}
if (islower(c))
lower = 1;
else if (isupper(c))
upper = 1;
else if (c == ERASE || c == '#' || c == '\b') {
if (np > name) {
np--;
if (tmode.sg_ospeed >= B1200)
puts("\b \b");
else
putchr(cs);
}
continue;
} else if (c == KILL || c == '@') {
putchr(cs);
putchr('\r');
if (tmode.sg_ospeed < B1200)
putchr('\n');
/* this is the way they do it down under ... */
else if (np > name)
puts(" \r");
prompt();
np = name;
continue;
} else if (isdigit(c))
digit++;
if (IG && (c <= ' ' || c > 0176))
continue;
*np++ = c;
putchr(cs);
}
signal(SIGINT, SIG_IGN);
*np = 0;
if (c == '\r')
crmod = 1;
if (upper && !lower && !LC || UC)
for (np = name; *np; np++)
if (isupper(*np))
*np = tolower(*np);
return (1);
}
static
short tmspc10[] = {
0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10, 5, 15
};
static void
putpad(s)
register char *s;
{
register pad = 0;
register mspc10;
if (isdigit(*s)) {
while (isdigit(*s)) {
pad *= 10;
pad += *s++ - '0';
}
pad *= 10;
if (*s == '.' && isdigit(s[1])) {
pad += s[1] - '0';
s += 2;
}
}
puts(s);
/*
* If no delay needed, or output speed is
* not comprehensible, then don't try to delay.
*/
if (pad == 0)
return;
if (tmode.sg_ospeed <= 0 ||
tmode.sg_ospeed >= (sizeof tmspc10 / sizeof tmspc10[0]))
return;
/*
* Round up by a half a character frame, and then do the delay.
* Too bad there are no user program accessible programmed delays.
* Transmitting pad characters slows many terminals down and also
* loads the system.
*/
mspc10 = tmspc10[tmode.sg_ospeed];
pad += mspc10 / 2;
for (pad /= mspc10; pad > 0; pad--)
putchr(*PC);
}
static void
puts(s)
register char *s;
{
while (*s)
putchr(*s++);
}
char outbuf[OBUFSIZ];
int obufcnt = 0;
static void
putchr(cc)
int cc;
{
char c;
c = cc;
if (!NP) {
c |= partab[c&0177] & 0200;
if (OP)
c ^= 0200;
}
if (!UB) {
outbuf[obufcnt++] = c;
if (obufcnt >= OBUFSIZ)
oflush();
} else
write(STDOUT_FILENO, &c, 1);
}
static void
oflush()
{
if (obufcnt)
write(STDOUT_FILENO, outbuf, obufcnt);
obufcnt = 0;
}
static void
prompt()
{
putf(LM);
if (CO)
putchr('\n');
}
static void
putf(cp)
register char *cp;
{
extern char editedhost[];
time_t t;
char *slash, db[100];
while (*cp) {
if (*cp != '%') {
putchr(*cp++);
continue;
}
switch (*++cp) {
case 't':
slash = strrchr(ttyn, '/');
if (slash == (char *) 0)
puts(ttyn);
else
puts(&slash[1]);
break;
case 'h':
puts(editedhost);
break;
case 'd': {
static char fmt[] = "%l:% %P on %A, %d %B %Y";
fmt[4] = 'M'; /* I *hate* SCCS... */
(void)time(&t);
(void)strftime(db, sizeof(db), fmt, localtime(&t));
puts(db);
break;
}
case '%':
putchr('%');
break;
}
cp++;
}
}