OpenBSD-4.6/libexec/getty/main.c
/* $OpenBSD: main.c,v 1.29 2008/02/09 10:13:34 mbalmer Exp $ */
/*-
* 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. 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[] = "from: @(#)main.c 8.1 (Berkeley) 6/20/93";*/
static char rcsid[] = "$OpenBSD: main.c,v 1.29 2008/02/09 10:13:34 mbalmer Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <time.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <util.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 */
/* defines for auto detection of incoming PPP calls (->PAP/CHAP) */
#define PPP_FRAME 0x7e /* PPP Framing character */
#define PPP_STATION 0xff /* "All Station" character */
#define PPP_ESCAPE 0x7d /* Escape Character */
#define PPP_CONTROL 0x03 /* PPP Control Field */
#define PPP_CONTROL_ESCAPED 0x23 /* PPP Control Field, escaped */
#define PPP_LCP_HI 0xc0 /* LCP protocol - high byte */
#define PPP_LCP_LOW 0x21 /* LCP protocol - low byte */
struct termios tmode, omode;
int crmod, digit, lower, upper;
char hostname[MAXHOSTNAMELEN];
struct utsname kerninfo;
char name[MAXLOGNAME];
char dev[] = _PATH_DEV;
char ttyn[32];
char *portselector(void);
#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.c_cc[VERASE]
#define KILL tmode.c_cc[VKILL]
#define EOT tmode.c_cc[VEOF]
static void
dingdong(int signo)
{
tmode.c_ispeed = tmode.c_ospeed = 0;
(void)tcsetattr(0, TCSANOW, &tmode);
_exit(1);
}
volatile sig_atomic_t interrupt_flag;
static void
interrupt(int signo)
{
int save_errno = errno;
interrupt_flag = 1;
signal(SIGINT, interrupt);
errno = save_errno;
}
/*
* Action to take when getty is running too long.
*/
static void
timeoverrun(int signo)
{
struct syslog_data sdata = SYSLOG_DATA_INIT;
syslog_r(LOG_ERR, &sdata,
"getty exiting due to excessive running time");
_exit(1);
}
static int getname(void);
static void oflush(void);
static void prompt(void);
static void putchr(int);
static void putf(char *);
static void putpad(char *);
static void xputs(char *);
int
main(int argc, char *argv[])
{
extern char **environ;
char *tname;
int repcnt = 0, failopenlogged = 0;
struct rlimit limit;
int rval;
signal(SIGINT, SIG_IGN);
/*
signal(SIGQUIT, SIG_DFL);
*/
openlog("getty", LOG_ODELAY|LOG_CONS|LOG_PID, LOG_AUTH);
gethostname(hostname, sizeof(hostname));
if (hostname[0] == '\0')
strlcpy(hostname, "Amnesiac", sizeof hostname);
uname(&kerninfo);
/*
* 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) {
snprintf(ttyn, sizeof ttyn, "%s", ttyname(0));
} else {
int i;
snprintf(ttyn, sizeof ttyn, "%s%s", dev, argv[2]);
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) &&
(errno != ENXIO || !failopenlogged)) {
syslog(LOG_ERR, "%s: %m", ttyn);
closelog();
failopenlogged = 1;
}
repcnt++;
sleep(60);
}
login_tty(i);
}
}
/* Start with default tty settings */
if (tcgetattr(0, &tmode) < 0) {
syslog(LOG_ERR, "%s: %m", ttyn);
exit(1);
}
omode = tmode;
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;
(void)tcflush(0, TCIOFLUSH); /* clear out the crap */
ioctl(0, FIONBIO, &off); /* turn off non-blocking mode */
ioctl(0, FIOASYNC, &off); /* ditto for async mode */
if (IS)
cfsetispeed(&tmode, IS);
else if (SP)
cfsetispeed(&tmode, SP);
if (OS)
cfsetospeed(&tmode, OS);
else if (SP)
cfsetospeed(&tmode, SP);
setflags(0);
setchars();
if (tcsetattr(0, TCSANOW, &tmode) < 0) {
syslog(LOG_ERR, "%s: %m", ttyn);
exit(1);
}
if (AB) {
tname = autobaud();
continue;
}
if (PS) {
tname = portselector();
continue;
}
if (CL && *CL)
putpad(CL);
edithost(HE);
if (IM && *IM)
putf(IM);
if (TO) {
signal(SIGALRM, dingdong);
alarm(TO);
}
if ((rval = getname()) == 2) {
oflush();
alarm(0);
signal(SIGALRM, SIG_DFL);
execle(PP, "ppplogin", ttyn, (char *) 0, env);
syslog(LOG_ERR, "%s: %m", PP);
exit(1);
} else if (rval) {
int i;
oflush();
alarm(0);
signal(SIGALRM, SIG_DFL);
if (name[0] == '-') {
xputs("user names may not start with '-'.");
continue;
}
if (!(upper || lower || digit))
continue;
setflags(2);
if (crmod) {
tmode.c_iflag |= ICRNL;
tmode.c_oflag |= ONLCR;
}
if (upper || UC) {
tmode.c_iflag |= IUCLC;
tmode.c_oflag |= OLCUC;
tmode.c_lflag |= XCASE;
}
if (lower || LC) {
tmode.c_iflag &= ~IUCLC;
tmode.c_oflag &= ~OLCUC;
tmode.c_lflag &= ~XCASE;
}
if (tcsetattr(0, TCSANOW, &tmode) < 0) {
syslog(LOG_ERR, "%s: %m", ttyn);
exit(1);
}
signal(SIGINT, SIG_DFL);
for (i = 0; environ[i] != (char *)0; i++)
env[i] = environ[i];
makeenv(&env[i]);
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(void)
{
int ppp_state = 0, ppp_connection = 0;
unsigned char cs;
int c, r;
char *np;
/*
* Interrupt may happen if we use CBREAK mode
*/
signal(SIGINT, interrupt);
setflags(1);
prompt();
if (PF > 0) {
oflush();
sleep(PF);
PF = 0;
}
if (tcsetattr(0, TCSANOW, &tmode) < 0) {
syslog(LOG_ERR, "%s: %m", ttyn);
exit(1);
}
crmod = digit = lower = upper = 0;
np = name;
for (;;) {
oflush();
r = read(STDIN_FILENO, &cs, 1);
if (r <= 0) {
if (r == -1 && errno == EINTR && interrupt_flag) {
interrupt_flag = 0;
return (0);
}
exit(0);
}
if ((c = cs&0177) == 0)
return (0);
/*
* PPP detection state machine..
* Look for sequences:
* PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or
* PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC)
* See RFC1662.
* Derived from code from Michael Hancock <michaelh@cet.co.jp>
* and Erik 'PPP' Olson <eriko@wrq.com>
*/
if (PP && cs == PPP_FRAME) {
ppp_state = 1;
} else if (ppp_state == 1 && cs == PPP_STATION) {
ppp_state = 2;
} else if (ppp_state == 2 && cs == PPP_ESCAPE) {
ppp_state = 3;
} else if ((ppp_state == 2 && cs == PPP_CONTROL) ||
(ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) {
ppp_state = 4;
} else if (ppp_state == 4 && cs == PPP_LCP_HI) {
ppp_state = 5;
} else if (ppp_state == 5 && cs == PPP_LCP_LOW) {
ppp_connection = 1;
break;
} else {
ppp_state = 0;
}
if (c == EOT)
exit(1);
if (c == '\r' || c == '\n' || np >= name + sizeof name -1) {
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 (cfgetospeed(&tmode) >= 1200)
xputs("\b \b");
else
putchr(cs);
}
continue;
} else if (c == KILL || c == '@') {
putchr(cs);
putchr('\r');
if (cfgetospeed(&tmode) < 1200)
putchr('\n');
/* this is the way they do it down under ... */
else if (np > name)
xputs(" \r");
prompt();
np = name;
continue;
} else if (isdigit(c))
digit++;
if (IG && (c <= ' ' || c > 0176))
continue;
*np++ = c;
putchr(cs);
}
signal(SIGINT, SIG_IGN);
if (interrupt_flag) {
interrupt_flag = 0;
return (0);
}
*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 + ppp_connection);
}
static void
putpad(char *s)
{
int pad = 0;
speed_t ospeed = cfgetospeed(&tmode);
if (isdigit(*s)) {
while (isdigit(*s)) {
pad *= 10;
pad += *s++ - '0';
}
pad *= 10;
if (*s == '.' && isdigit(s[1])) {
pad += s[1] - '0';
s += 2;
}
}
xputs(s);
/*
* If no delay needed, or output speed is
* not comprehensible, then don't try to delay.
*/
if (pad == 0 || ospeed <= 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.
*/
pad = (pad * ospeed + 50000) / 100000;
while (pad--)
putchr(*PC);
}
static void
xputs(char *s)
{
while (*s)
putchr(*s++);
}
char outbuf[OBUFSIZ];
int obufcnt = 0;
static void
putchr(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(void)
{
if (obufcnt)
write(STDOUT_FILENO, outbuf, obufcnt);
obufcnt = 0;
}
static void
prompt(void)
{
putf(LM);
if (CO)
putchr('\n');
}
static void
putf(char *cp)
{
extern char editedhost[];
char *slash, db[100];
time_t t;
while (*cp) {
if (*cp != '%') {
putchr(*cp++);
continue;
}
switch (*++cp) {
case 't':
slash = strrchr(ttyn, '/');
if (slash == (char *) 0)
xputs(ttyn);
else
xputs(&slash[1]);
break;
case 'h':
xputs(editedhost);
break;
case 'd': {
(void)time(&t);
(void)strftime(db, sizeof(db),
"%l:%M%p on %A, %d %B %Y", localtime(&t));
xputs(db);
break;
}
case 's':
xputs(kerninfo.sysname);
break;
case 'm':
xputs(kerninfo.machine);
break;
case 'r':
xputs(kerninfo.release);
break;
case 'v':
xputs(kerninfo.version);
break;
case '%':
putchr('%');
break;
}
cp++;
}
}