/*
* Alternate Getty (agetty) 'agetty' is a versatile, portable, easy to use
* replacement for getty on SunOS 4.1.x or the SAC ttymon/ttyadm/sacadm/pmadm
* suite on Solaris and other SVR4 systems. 'agetty' was written by Wietse
* Venema, enhanced by John DiMarco, and further enhanced by Dennis Cronin.
*
* Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
*
* This program is freely distributable.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <ctype.h>
#include <utmp.h>
#include <getopt.h>
#include <time.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <netdb.h>
#include "strutils.h"
#include "nls.h"
#include "pathnames.h"
#include "c.h"
#include "xalloc.h"
#ifdef __linux__
# include <sys/param.h>
# define USE_SYSLOG
#endif
/* If USE_SYSLOG is undefined all diagnostics go to /dev/console. */
#ifdef USE_SYSLOG
# include <syslog.h>
#endif
/*
* Some heuristics to find out what environment we are in: if it is not
* System V, assume it is SunOS 4. The LOGIN_PROCESS is defined in System V
* utmp.h, which will select System V style getty.
*/
#ifdef LOGIN_PROCESS
# define SYSV_STYLE
#endif
/*
* Things you may want to modify.
*
* If ISSUE is not defined, agetty will never display the contents of the
* /etc/issue file. You will not want to spit out large "issue" files at the
* wrong baud rate. Relevant for System V only.
*
* You may disagree with the default line-editing etc. characters defined
* below. Note, however, that DEL cannot be used for interrupt generation
* and for line editing at the same time.
*/
/* Displayed before the login prompt. */
#ifdef SYSV_STYLE
# define ISSUE _PATH_ISSUE
# include <sys/utsname.h>
#endif
/* Login prompt. */
#define LOGIN " login: "
/* Some shorthands for control characters. */
#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
#define CR CTL('M') /* carriage return */
#define NL CTL('J') /* line feed */
#define BS CTL('H') /* back space */
#define DEL CTL('?') /* delete */
/* Defaults for line-editing etc. characters; you may want to change these. */
#define DEF_ERASE DEL /* default erase character */
#define DEF_INTR CTL('C') /* default interrupt character */
#define DEF_QUIT CTL('\\') /* default quit char */
#define DEF_KILL CTL('U') /* default kill char */
#define DEF_EOF CTL('D') /* default EOF char */
#define DEF_EOL 0
#define DEF_SWITCH 0 /* default switch char */
#ifndef MAXHOSTNAMELEN
# ifdef HOST_NAME_MAX
# define MAXHOSTNAMELEN HOST_NAME_MAX
# else
# define MAXHOSTNAMELEN 64
# endif /* HOST_NAME_MAX */
#endif /* MAXHOSTNAMELEN */
/*
* When multiple baud rates are specified on the command line, the first one
* we will try is the first one specified.
*/
#define FIRST_SPEED 0
/* Storage for command-line options. */
#define MAX_SPEED 10 /* max. nr. of baud rates */
struct options {
int flags; /* toggle switches, see below */
int timeout; /* time-out period */
char *login; /* login program */
char *tty; /* name of tty */
char *initstring; /* modem init string */
char *issue; /* alternative issue file */
int numspeed; /* number of baud rates to try */
int speeds[MAX_SPEED]; /* baud rates to be tried */
int eightbits; /* assume 8bit-clean tty */
};
#define F_PARSE (1<<0) /* process modem status messages */
#define F_ISSUE (1<<1) /* display /etc/issue */
#define F_RTSCTS (1<<2) /* enable RTS/CTS flow control */
#define F_LOCAL (1<<3) /* force local */
#define F_INITSTRING (1<<4) /* initstring is set */
#define F_WAITCRLF (1<<5) /* wait for CR or LF */
#define F_CUSTISSUE (1<<6) /* give alternative issue file */
#define F_NOPROMPT (1<<7) /* do not ask for login name! */
#define F_LCUC (1<<8) /* support for *LCUC stty modes */
#define F_KEEPSPEED (1<<9) /* follow baud rate from kernel */
#define F_KEEPCFLAGS (1<<10) /* reuse c_cflags setup from kernel */
/* Storage for things detected while the login name was read. */
struct chardata {
int erase; /* erase character */
int kill; /* kill character */
int eol; /* end-of-line character */
int parity; /* what parity did we see */
int capslock; /* upper case without lower case */
};
/* Initial values for the above. */
struct chardata init_chardata = {
DEF_ERASE, /* default erase character */
DEF_KILL, /* default kill character */
13, /* default eol char */
0, /* space parity */
0, /* no capslock */
};
struct Speedtab {
long speed;
int code;
};
static struct Speedtab speedtab[] = {
{50, B50},
{75, B75},
{110, B110},
{134, B134},
{150, B150},
{200, B200},
{300, B300},
{600, B600},
{1200, B1200},
{1800, B1800},
{2400, B2400},
{4800, B4800},
{9600, B9600},
#ifdef B19200
{19200, B19200},
#endif
#ifdef B38400
{38400, B38400},
#endif
#ifdef EXTA
{19200, EXTA},
#endif
#ifdef EXTB
{38400, EXTB},
#endif
#ifdef B57600
{57600, B57600},
#endif
#ifdef B115200
{115200, B115200},
#endif
#ifdef B230400
{230400, B230400},
#endif
{0, 0},
};
static void parse_args(int argc, char **argv, struct options *op);
static void parse_speeds(struct options *op, char *arg);
static void update_utmp(char *line);
static void open_tty(char *tty, struct termios *tp, int local);
static void termio_init(struct options *op, struct termios *tp);
static void auto_baud(struct termios *tp);
static void do_prompt(struct options *op, struct termios *tp);
static void next_speed(struct options *op, struct termios *tp);
static char *get_logname(struct options *op,
struct termios *tp, struct chardata *cp);
static void termio_final(struct options *op,
struct termios *tp, struct chardata *cp);
static int caps_lock(char *s);
static int bcode(char *s);
static void usage(FILE * out);
static void error(const char *, ...);
/* Fake hostname for ut_host specified on command line. */
char *fakehost = NULL;
#ifdef DEBUGGING
#define debug(s) fprintf(dbf,s); fflush(dbf)
FILE *dbf;
#else
#define debug(s)
#endif /* DEBUGGING */
int main(int argc, char **argv)
{
char *logname = NULL; /* login name, given to /bin/login */
struct chardata chardata; /* will be set by get_logname() */
struct termios termios; /* terminal mode bits */
static struct options options = {
F_ISSUE, /* show /etc/issue (SYSV_STYLE) */
0, /* no timeout */
_PATH_LOGIN, /* default login program */
"tty1", /* default tty line */
"", /* modem init string */
ISSUE, /* default issue file */
0, /* no baud rates known yet */
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
#ifdef DEBUGGING
dbf = fopen("/dev/ttyp0", "w");
for (int i = 1; i < argc; i++)
debug(argv[i]);
#endif /* DEBUGGING */
/* Parse command-line arguments. */
parse_args(argc, argv, &options);
#ifdef __linux__
setsid();
#endif
/* Update the utmp file. */
#ifdef SYSV_STYLE
update_utmp(options.tty);
#endif
debug("calling open_tty\n");
/* Open the tty as standard { input, output, error }. */
open_tty(options.tty, &termios, options.flags & F_LOCAL);
tcsetpgrp(STDIN_FILENO, getpid());
/* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
debug("calling termio_init\n");
termio_init(&options, &termios);
/* Write the modem init string and DO NOT flush the buffers. */
if (options.flags & F_INITSTRING) {
debug("writing init string\n");
ignore_result(write
(STDIN_FILENO, options.initstring,
strlen(options.initstring)));
}
if (!(options.flags & F_LOCAL))
/* Go to blocking write mode unless -L is specified. */
fcntl(STDOUT_FILENO, F_SETFL,
fcntl(STDOUT_FILENO, F_GETFL, 0) & ~O_NONBLOCK);
/* Optionally detect the baud rate from the modem status message. */
debug("before autobaud\n");
if (options.flags & F_PARSE)
auto_baud(&termios);
/* Set the optional timer. */
if (options.timeout)
alarm((unsigned)options.timeout);
/* Optionally wait for CR or LF before writing /etc/issue */
if (options.flags & F_WAITCRLF) {
char ch;
debug("waiting for cr-lf\n");
while (read(STDIN_FILENO, &ch, 1) == 1) {
/* Strip "parity bit". */
ch &= 0x7f;
#ifdef DEBUGGING
fprintf(dbf, "read %c\n", ch);
#endif
if (ch == '\n' || ch == '\r')
break;
}
}
chardata = init_chardata;
if (!(options.flags & F_NOPROMPT)) {
/* Read the login name. */
debug("reading login name\n");
while ((logname =
get_logname(&options, &termios, &chardata)) == 0)
next_speed(&options, &termios);
}
/* Disable timer. */
if (options.timeout)
alarm(0);
/* Finalize the termios settings. */
termio_final(&options, &termios, &chardata);
/* Now the newline character should be properly written. */
ignore_result(write(STDOUT_FILENO, "\n", 1));
/* Let the login program take care of password validation. */
execl(options.login, options.login, "--", logname, NULL);
error(_("%s: can't exec %s: %m"), options.tty, options.login);
}
/* Parse command-line arguments. */
void parse_args(int argc, char **argv, struct options *op)
{
extern char *optarg;
extern int optind;
int c;
enum {
VERSION_OPTION = CHAR_MAX + 1,
HELP_OPTION
};
static const struct option longopts[] = {
{ "8bits", no_argument, 0, '8' },
{ "noreset", no_argument, 0, 'c' },
{ "issue-file", required_argument, 0, 'f' },
{ "flow-control", no_argument, 0, 'h' },
{ "host", required_argument, 0, 'H' },
{ "noissue", no_argument, 0, 'i' },
{ "init-string", required_argument, 0, 'I' },
{ "login-program", required_argument, 0, 'l' },
{ "local-line", no_argument, 0, 'L' },
{ "extract-baud", no_argument, 0, 'm' },
{ "skip-login", no_argument, 0, 'n' },
{ "keep-baud", no_argument, 0, 's' },
{ "timeout", required_argument, 0, 't' },
{ "detect-case", no_argument, 0, 'U' },
{ "wait-cr", no_argument, 0, 'w' },
{ "version", no_argument, 0, VERSION_OPTION },
{ "help", no_argument, 0, HELP_OPTION },
{ NULL, 0, 0, 0 }
};
while ((c =
getopt_long(argc, argv, "8cf:hH:iI:l:Lmnst:Uw", longopts,
NULL)) != -1) {
switch (c) {
case '8':
op->eightbits = 1;
break;
case 'c':
op->flags |= F_KEEPCFLAGS;
break;
case 'f':
op->flags |= F_CUSTISSUE;
op->issue = optarg;
break;
case 'h':
op->flags |= F_RTSCTS;
break;
case 'H':
fakehost = optarg;
break;
case 'i':
op->flags &= ~F_ISSUE;
break;
case 'I':
/*
* FIXME: It would be better to use a separate
* function for this task.
*/
{
char ch, *p, *q;
int i;
op->initstring = xmalloc(strlen(optarg) + 1);
/*
* Copy optarg into op->initstring decoding \ddd octal
* codes into chars.
*/
q = op->initstring;
p = optarg;
while (*p) {
/* The \\ is converted to \ */
if (*p == '\\') {
p++;
if (*p == '\\') {
ch = '\\';
p++;
} else {
/* Handle \000 - \177. */
ch = 0;
for (i = 1; i <= 3; i++) {
if (*p >= '0' && *p <= '7') {
ch <<= 3;
ch += *p - '0';
p++;
} else {
break;
}
}
}
*q++ = ch;
} else
*q++ = *p++;
}
*q = '\0';
op->flags |= F_INITSTRING;
break;
}
case 'l':
op->login = optarg;
break;
case 'L':
op->flags |= F_LOCAL;
break;
case 'm':
op->flags |= F_PARSE;
break;
case 'n':
op->flags |= F_NOPROMPT;
break;
case 's':
op->flags |= F_KEEPSPEED;
break;
case 't':
if ((op->timeout = atoi(optarg)) <= 0)
error(_("bad timeout value: %s"), optarg);
break;
case 'U':
op->flags |= F_LCUC;
break;
case 'w':
op->flags |= F_WAITCRLF;
break;
case VERSION_OPTION:
printf(_("%s from %s\n"), program_invocation_short_name,
PACKAGE_STRING);
exit(EXIT_SUCCESS);
case HELP_OPTION:
usage(stdout);
default:
usage(stderr);
}
}
debug("after getopt loop\n");
if (argc < optind + 2) {
warnx(_("not enough arguments"));
usage(stderr);
}
/* Accept both "baudrate tty" and "tty baudrate". */
if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
/* Assume BSD style speed. */
parse_speeds(op, argv[optind++]);
op->tty = argv[optind];
} else {
op->tty = argv[optind++];
parse_speeds(op, argv[optind]);
}
optind++;
if (argc > optind && argv[optind])
setenv("TERM", argv[optind], 1);
#ifdef DO_DEVFS_FIDDLING
/*
* Some devfs junk, following Goswin Brederlow:
* turn ttyS<n> into tts/<n>
* turn tty<n> into vc/<n>
* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=72241
*/
if (op->tty && strlen(op->tty) < 90) {
char dev_name[100];
struct stat st;
if (strncmp(op->tty, "ttyS", 4) == 0) {
strcpy(dev_name, "/dev/");
strcat(dev_name, op->tty);
if (stat(dev_name, &st) < 0) {
strcpy(dev_name, "/dev/tts/");
strcat(dev_name, op->tty + 4);
if (stat(dev_name, &st) == 0)
op->tty = xstrdup(dev_name + 5);
}
} else if (strncmp(op->tty, "tty", 3) == 0) {
strcpy(dev_name, "/dev/");
strncat(dev_name, op->tty, 90);
if (stat(dev_name, &st) < 0) {
strcpy(dev_name, "/dev/vc/");
strcat(dev_name, op->tty + 3);
if (stat(dev_name, &st) == 0)
op->tty = xstrdup(dev_name + 5);
}
}
}
#endif /* DO_DEVFS_FIDDLING */
debug("exiting parseargs\n");
}
/* Parse alternate baud rates. */
void parse_speeds(struct options *op, char *arg)
{
char *cp;
debug("entered parse_speeds\n");
for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *)0, ",")) {
if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
error(_("bad speed: %s"), cp);
if (op->numspeed >= MAX_SPEED)
error(_("too many alternate speeds"));
}
debug("exiting parsespeeds\n");
}
#ifdef SYSV_STYLE
/* Update our utmp entry. */
void update_utmp(char *line)
{
struct utmp ut;
time_t t;
int mypid = getpid();
struct utmp *utp;
/*
* The utmp file holds miscellaneous information about things started by
* /sbin/init and other system-related events. Our purpose is to update
* the utmp entry for the current process, in particular the process type
* and the tty line we are listening to. Return successfully only if the
* utmp file can be opened for update, and if we are able to find our
* entry in the utmp file.
*/
utmpname(_PATH_UTMP);
setutent();
/*
* Find mypid in utmp.
*
* FIXME: Earlier (when was that?) code here tested only utp->ut_type !=
* INIT_PROCESS, so maybe the >= here should be >.
*
* FIXME: The present code is taken from login.c, so if this is changed,
* maybe login has to be changed as well (is this true?).
*/
while ((utp = getutent()))
if (utp->ut_pid == mypid
&& utp->ut_type >= INIT_PROCESS
&& utp->ut_type <= DEAD_PROCESS)
break;
if (utp) {
memcpy(&ut, utp, sizeof(ut));
} else {
/* Some inits do not initialize utmp. */
memset(&ut, 0, sizeof(ut));
strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
}
strncpy(ut.ut_user, "LOGIN", sizeof(ut.ut_user));
strncpy(ut.ut_line, line, sizeof(ut.ut_line));
if (fakehost)
strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
time(&t);
ut.ut_time = t;
ut.ut_type = LOGIN_PROCESS;
ut.ut_pid = mypid;
pututline(&ut);
endutent();
{
#ifdef HAVE_UPDWTMP
updwtmp(_PATH_WTMP, &ut);
#else
int ut_fd;
int lf;
if ((lf = open(_PATH_WTMPLOCK, O_CREAT | O_WRONLY, 0660)) >= 0) {
flock(lf, LOCK_EX);
if ((ut_fd =
open(_PATH_WTMP, O_APPEND | O_WRONLY)) >= 0) {
ignore_result(write(ut_fd, &ut, sizeof(ut)));
close(ut_fd);
}
flock(lf, LOCK_UN);
close(lf);
}
#endif /* HAVE_UPDWTMP */
}
}
#endif /* SYSV_STYLE */
/* Set up tty as stdin, stdout & stderr. */
void open_tty(char *tty, struct termios *tp, int local)
{
/* Get rid of the present outputs. */
close(STDOUT_FILENO);
close(STDERR_FILENO);
errno = 0;
/*
* Set up new standard input, unless we are given an already opened
* port.
*/
if (strcmp(tty, "-")) {
struct stat st;
/* Sanity checks. */
if (chdir("/dev"))
error(_("/dev: chdir() failed: %m"));
if (stat(tty, &st) < 0)
error("/dev/%s: %m", tty);
if ((st.st_mode & S_IFMT) != S_IFCHR)
error(_("/dev/%s: not a character device"), tty);
/* Open the tty as standard input. */
close(STDIN_FILENO);
errno = 0;
debug("open(2)\n");
if (open(tty, O_RDWR | O_NONBLOCK, 0) != 0)
error(_("/dev/%s: cannot open as standard input: %m"),
tty);
} else {
/*
* Standard input should already be connected to an open port. Make
* sure it is open for read/write.
*/
if ((fcntl(STDIN_FILENO, F_GETFL, 0) & O_RDWR) != O_RDWR)
error(_("%s: not open for read/write"), tty);
}
/* Set up standard output and standard error file descriptors. */
debug("duping\n");
/* set up stdout and stderr */
if (dup(STDIN_FILENO) != 1 || dup(STDIN_FILENO) != 2)
error(_("%s: dup problem: %m"), tty);
/*
* The following ioctl will fail if stdin is not a tty, but also when
* there is noise on the modem control lines. In the latter case, the
* common course of action is (1) fix your cables (2) give the modem
* more time to properly reset after hanging up.
*
* SunOS users can achieve (2) by patching the SunOS kernel variable
* "zsadtrlow" to a larger value; 5 seconds seems to be a good value.
* http://www.sunmanagers.org/archives/1993/0574.html
*/
if (tcgetattr(STDIN_FILENO, tp) < 0)
error("%s: tcgetattr: %m", tty);
/*
* Linux login(1) will change tty permissions. Use root owner and group
* with permission -rw------- for the period between getty and login.
*/
ignore_result(chown(tty, 0, 0));
ignore_result(chmod(tty, 0600));
errno = 0;
}
/* Initialize termios settings. */
char gbuf[1024];
char area[1024];
void termio_init(struct options *op, struct termios *tp)
{
speed_t ispeed, ospeed;
if (op->flags & F_KEEPSPEED) {
/* Save the original setting. */
ispeed = cfgetispeed(tp);
ospeed = cfgetospeed(tp);
} else {
ospeed = ispeed = op->speeds[FIRST_SPEED];
}
/*
* Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
* Special characters are set after we have read the login name; all
* reads will be done in raw mode anyway. Errors will be dealt with
* later on.
*/
/* Flush input and output queues, important for modems! */
tcflush(STDIN_FILENO, TCIOFLUSH);
tp->c_iflag = tp->c_lflag = tp->c_oflag = 0;
if (!(op->flags & F_KEEPCFLAGS))
tp->c_cflag = CS8 | HUPCL | CREAD | (tp->c_cflag & CLOCAL);
/*
* Note that the speed is stored in the c_cflag termios field, so we have
* set the speed always when the cflag se reseted.
*/
cfsetispeed(tp, ispeed);
cfsetospeed(tp, ospeed);
if (op->flags & F_LOCAL)
tp->c_cflag |= CLOCAL;
#ifdef HAVE_STRUCT_TERMIOS_C_LINE
tp->c_line = 0;
#endif
tp->c_cc[VMIN] = 1;
tp->c_cc[VTIME] = 0;
/* Optionally enable hardware flow control. */
#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
tcsetattr(STDIN_FILENO, TCSANOW, tp);
/* Go to blocking input even in local mode. */
fcntl(STDIN_FILENO, F_SETFL,
fcntl(STDIN_FILENO, F_GETFL, 0) & ~O_NONBLOCK);
debug("term_io 2\n");
}
/* Extract baud rate from modem status message. */
void auto_baud(struct termios *tp)
{
int speed;
int vmin;
unsigned iflag;
char buf[BUFSIZ];
char *bp;
int nread;
/*
* This works only if the modem produces its status code AFTER raising
* the DCD line, and if the computer is fast enough to set the proper
* baud rate before the message has gone by. We expect a message of the
* following format:
*
* <junk><number><junk>
*
* The number is interpreted as the baud rate of the incoming call. If the
* modem does not tell us the baud rate within one second, we will keep
* using the current baud rate. It is advisable to enable BREAK
* processing (comma-separated list of baud rates) if the processing of
* modem status messages is enabled.
*/
/*
* Use 7-bit characters, don't block if input queue is empty. Errors will
* be dealt with later on.
*/
iflag = tp->c_iflag;
/* Enable 8th-bit stripping. */
tp->c_iflag |= ISTRIP;
vmin = tp->c_cc[VMIN];
/* Do not block when queue is empty. */
tp->c_cc[VMIN] = 0;
tcsetattr(STDIN_FILENO, TCSANOW, tp);
/*
* Wait for a while, then read everything the modem has said so far and
* try to extract the speed of the dial-in call.
*/
sleep(1);
if ((nread = read(STDIN_FILENO, buf, sizeof(buf) - 1)) > 0) {
buf[nread] = '\0';
for (bp = buf; bp < buf + nread; bp++)
if (isascii(*bp) && isdigit(*bp)) {
if ((speed = bcode(bp))) {
cfsetispeed(tp, speed);
cfsetospeed(tp, speed);
}
break;
}
}
/* Restore terminal settings. Errors will be dealt with later on. */
tp->c_iflag = iflag;
tp->c_cc[VMIN] = vmin;
tcsetattr(STDIN_FILENO, TCSANOW, tp);
}
/* Show login prompt, optionally preceded by /etc/issue contents. */
void do_prompt(struct options *op, struct termios *tp)
{
#ifdef ISSUE
FILE *fd;
int oflag;
int c;
struct utsname uts;
uname(&uts);
#endif /* ISSUE */
/* Issue not in use, start with a new line. */
ignore_result(write(STDOUT_FILENO, "\r\n", 2));
#ifdef ISSUE
if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) {
/* Save current setting. */
oflag = tp->c_oflag;
/* Map new line in output to carriage return & new line. */
tp->c_oflag |= (ONLCR | OPOST);
tcsetattr(STDIN_FILENO, TCSADRAIN, tp);
while ((c = getc(fd)) != EOF) {
if (c == '\\') {
c = getc(fd);
switch (c) {
case 's':
printf("%s", uts.sysname);
break;
case 'n':
printf("%s", uts.nodename);
break;
case 'r':
printf("%s", uts.release);
break;
case 'v':
printf("%s", uts.version);
break;
case 'm':
printf("%s", uts.machine);
break;
case 'o':
/*
* FIXME: It would be better to use a
* separate function for this task.
*/
{
char domainname[MAXHOSTNAMELEN + 1];
#ifdef HAVE_GETDOMAINNAME
if (getdomainname(domainname, sizeof(domainname)))
#endif /* HAVE_GETDOMAINNAME */
strcpy(domainname, "unknown_domain");
domainname[sizeof(domainname) - 1] = '\0';
printf("%s", domainname);
break;
}
case 'O':
/*
* FIXME: It would be better to use a
* separate function for this task.
*/
{
char *dom = "unknown_domain";
char host[MAXHOSTNAMELEN + 1];
struct addrinfo hints, *info = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
if (gethostname(host, sizeof(host))
|| getaddrinfo(host, NULL, &hints, &info)
|| info == NULL) {
fputs(dom, stdout);
} else {
char *canon;
if (info->ai_canonname
&& (canon =
strchr(info->ai_canonname, '.'))) {
dom = canon + 1;
}
fputs(dom, stdout);
freeaddrinfo(info);
}
break;
}
case 'd':
case 't':
/*
* FIXME: It would be better to use a
* separate function for this task.
*/
{
time_t now;
struct tm *tm;
time(&now);
tm = localtime(&now);
if (c == 'd')
printf
("%s %s %d %d",
nl_langinfo(ABDAY_1 + tm->tm_wday),
nl_langinfo(ABMON_1 + tm->tm_mon),
tm->tm_mday,
/* FIXME: y2070 bug */
tm->tm_year < 70 ?
tm->tm_year + 2000 :
tm->tm_year + 1900);
else
printf("%02d:%02d:%02d",
tm->tm_hour, tm->tm_min, tm->tm_sec);
break;
}
case 'l':
printf("%s", op->tty);
break;
case 'b':
for (int i = 0; speedtab[i].speed; i++)
if (speedtab[i].code == cfgetispeed(tp))
printf("%ld", speedtab[i].speed);
break;
break;
case 'u':
case 'U':
/*
* FIXME: It would be better to use a
* separate function for this task.
*/
{
int users = 0;
struct utmp *ut;
setutent();
while ((ut = getutent()))
if (ut->ut_type == USER_PROCESS)
users++;
endutent();
printf("%d ", users);
if (c == 'U')
printf((users == 1) ?
_("user") : _("users"));
break;
}
default:
putchar(c);
}
} else
putchar(c);
}
fflush(stdout);
/* Restore settings. */
tp->c_oflag = oflag;
/* Wait till output is gone. */
tcsetattr(STDIN_FILENO, TCSADRAIN, tp);
fclose(fd);
}
#endif /* ISSUE */
{
char hn[MAXHOSTNAMELEN + 1];
if (gethostname(hn, sizeof(hn)) == 0)
ignore_result(write(STDIN_FILENO, hn, strlen(hn)));
}
/* Always show login prompt. */
ignore_result(write(STDOUT_FILENO, LOGIN, sizeof(LOGIN) - 1));
}
/* Select next baud rate. */
void next_speed(struct options *op, struct termios *tp)
{
static int baud_index = -1;
if (baud_index == -1)
/*
* If the F_KEEPSPEED flags is set then the FIRST_SPEED is not
* tested yet (see termio_init()).
*/
baud_index =
(op->flags & F_KEEPSPEED) ? FIRST_SPEED : 1 % op->numspeed;
else
baud_index = (baud_index + 1) % op->numspeed;
cfsetispeed(tp, op->speeds[baud_index]);
cfsetospeed(tp, op->speeds[baud_index]);
tcsetattr(STDIN_FILENO, TCSANOW, tp);
}
/* Get user name, establish parity, speed, erase, kill & eol. */
char *get_logname(struct options *op, struct termios *tp, struct chardata *cp)
{
static char logname[BUFSIZ];
char *bp;
char c; /* input character, full eight bits */
char ascval; /* low 7 bits of input character */
int bits; /* # of "1" bits per character */
int mask; /* mask with 1 bit up */
static char *erase[] = { /* backspace-space-backspace */
"\010\040\010", /* space parity */
"\010\040\010", /* odd parity */
"\210\240\210", /* even parity */
"\210\240\210", /* no parity */
};
/* Initialize kill, erase, parity etc. (also after switching speeds). */
*cp = init_chardata;
/*
* Flush pending input (especially important after parsing or switching
* the baud rate).
*/
sleep(1);
tcflush(STDIN_FILENO, TCIFLUSH);
/* Prompt for and read a login name. */
for (*logname = 0; *logname == 0; /* void */ ) {
/* Write issue file and prompt, with "parity" bit == 0. */
do_prompt(op, tp);
/*
* Read name, watch for break, parity, erase, kill,
* end-of-line.
*/
for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
/* Do not report trivial EINTR/EIO errors. */
if (read(STDIN_FILENO, &c, 1) < 1) {
if (errno == EINTR || errno == EIO)
exit(EXIT_SUCCESS);
error(_("%s: read: %m"), op->tty);
}
/* Do BREAK handling elsewhere. */
if ((c == 0) && op->numspeed > 1)
return EXIT_SUCCESS;
/* Do parity bit handling. */
if (op->eightbits) {
ascval = c;
} else if (c != (ascval = (c & 0177))) {
/* Set "parity" bit on. */
for (bits = 1, mask = 1; mask & 0177;
mask <<= 1)
if (mask & ascval)
/* Count "1" bits. */
bits++;
cp->parity |= ((bits & 1) ? 1 : 2);
}
/* Do erase, kill and end-of-line processing. */
switch (ascval) {
case CR:
case NL:
/* Terminate logname. */
*bp = 0;
/* Set end-of-line char. */
cp->eol = ascval;
break;
case BS:
case DEL:
case '#':
/* Set erase character. */
cp->erase = ascval;
if (bp > logname) {
ignore_result(write
(STDIN_FILENO,
erase[cp->parity], 3));
bp--;
}
break;
case CTL('U'):
case '@':
/* Set kill character. */
cp->kill = ascval;
while (bp > logname) {
ignore_result(write
(STDIN_FILENO,
erase[cp->parity], 3));
bp--;
}
break;
case CTL('D'):
exit(EXIT_SUCCESS);
default:
if (!isascii(ascval) || !isprint(ascval)) {
/* Ignore garbage characters. */ ;
} else if (bp - logname >= sizeof(logname) - 1) {
error(_("%s: input overrun"), op->tty);
} else {
/* Echo the character... */
ignore_result(write
(STDIN_FILENO, &c, 1));
/* ...and store it. */
*bp++ = ascval;
}
break;
}
}
}
/* Handle names with upper case and no lower case. */
if ((op->flags & F_LCUC) && (cp->capslock = caps_lock(logname)))
for (bp = logname; *bp; bp++)
if (isupper(*bp))
*bp = tolower(*bp);
return logname;
}
/* Set the final tty mode bits. */
void termio_final(struct options *op, struct termios *tp, struct chardata *cp)
{
/* General terminal-independent stuff. */
/* 2-way flow control */
tp->c_iflag |= IXON | IXOFF;
tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
/* no longer| ECHOCTL | ECHOPRT */
tp->c_oflag |= OPOST;
/* tp->c_cflag = 0; */
tp->c_cc[VINTR] = DEF_INTR;
tp->c_cc[VQUIT] = DEF_QUIT;
tp->c_cc[VEOF] = DEF_EOF;
tp->c_cc[VEOL] = DEF_EOL;
#ifdef __linux__
tp->c_cc[VSWTC] = DEF_SWITCH;
#elif defined(VSWTCH)
tp->c_cc[VSWTCH] = DEF_SWITCH;
#endif /* __linux__ */
/* Account for special characters seen in input. */
if (cp->eol == CR) {
tp->c_iflag |= ICRNL;
tp->c_oflag |= ONLCR;
}
tp->c_cc[VERASE] = cp->erase;
tp->c_cc[VKILL] = cp->kill;
/* Account for the presence or absence of parity bits in input. */
switch (cp->parity) {
case 0:
/* space (always 0) parity */
break;
case 1:
/* odd parity */
tp->c_cflag |= PARODD;
/* do not break */
case 2:
/* even parity */
tp->c_cflag |= PARENB;
tp->c_iflag |= INPCK | ISTRIP;
/* do not break */
case (1 | 2):
/* no parity bit */
tp->c_cflag &= ~CSIZE;
tp->c_cflag |= CS7;
break;
}
/* Account for upper case without lower case. */
if (cp->capslock) {
#ifdef IUCLC
tp->c_iflag |= IUCLC;
#endif
#ifdef XCASE
tp->c_lflag |= XCASE;
#endif
#ifdef OLCUC
tp->c_oflag |= OLCUC;
#endif
}
/* Optionally enable hardware flow control. */
#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
/* Finally, make the new settings effective. */
if (tcsetattr(STDIN_FILENO, TCSANOW, tp) < 0)
error("%s: tcsetattr: TCSANOW: %m", op->tty);
}
/*
* String contains upper case without lower case.
* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=52940
* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=156242
*/
int caps_lock(char *s)
{
int capslock;
for (capslock = 0; *s; s++) {
if (islower(*s))
return EXIT_SUCCESS;
if (capslock == 0)
capslock = isupper(*s);
}
return capslock;
}
/* Convert speed string to speed code; return 0 on failure. */
int bcode(s)
char *s;
{
struct Speedtab *sp;
long speed = atol(s);
for (sp = speedtab; sp->speed; sp++)
if (sp->speed == speed)
return sp->code;
return 0;
}
void __attribute__ ((__noreturn__)) usage(FILE * out)
{
fprintf(out, _("\nUsage:\n"
" %1$s [options] line baud_rate,... [termtype]\n"
" %1$s [options] baud_rate,... line [termtype]\n"),
program_invocation_short_name);
fprintf(out, _("\nOptions:\n"
" -8, --8bits assume 8-bit tty\n"
" -c, --noreset do not reset control mode\n"
" -f, --issue-file FILE display issue file\n"
" -h, --flow-control enable hardware flow control\n"
" -H, --host HOSTNAME specify login host\n"
" -i, --noissue do not display issue file\n"
" -I, --init-string STRING set init string\n"
" -l, --login-program FILE specify login program\n"
" -L, --local-line force local line\n"
" -m, --extract-baud extract baud rate during connect\n"
" -n, --skip-login do not prompt for login\n"
" -s, --keep-baud try to keep baud rate after break\n"
" -t, --timeout NUMBER login process timeout\n"
" -U, --detect-case detect uppercase terminal\n"
" -w, --wait-cr wait carriage-return\n"
" --version output version information and exit\n"
" --help display this help and exit\n\n"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
/* Report errors to console or syslog; only understands %s and %m. */
#define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2)
void error(const char *fmt, ...)
{
va_list ap;
#ifndef USE_SYSLOG
int fd;
#endif
char buf[BUFSIZ];
char *bp;
/*
* If the diagnostic is reported via syslog(3), the process name is
* automatically prepended to the message. If we write directly to
* /dev/console, we must prepend the process name ourselves.
*/
#ifdef USE_SYSLOG
buf[0] = '\0';
bp = buf;
#else
str2cpy(buf, program_invocation_short_name, ": ");
bp = buf + strlen(buf);
#endif /* USE_SYSLOG */
/*
* %s expansion is done by hand. On a System V Release 2 system without
* shared libraries and without syslog(3), linking with the the stdio
* library used to make the program three times as big...
*
* %m expansion is done here as well. Too bad syslog(3) does not have a
* vsprintf() like interface.
*/
va_start(ap, fmt);
while (*fmt && bp < &buf[BUFSIZ - 1]) {
if (strncmp(fmt, "%s", 2) == 0) {
xstrncpy(bp, va_arg(ap, char *), &buf[BUFSIZ - 1] - bp);
bp += strlen(bp);
fmt += 2;
} else if (strncmp(fmt, "%m", 2) == 0) {
xstrncpy(bp, strerror(errno), &buf[BUFSIZ - 1] - bp);
bp += strlen(bp);
fmt += 2;
} else {
*bp++ = *fmt++;
}
}
*bp = 0;
va_end(ap);
/*
* Write the diagnostic directly to /dev/console if we do not use the
* syslog(3) facility.
*/
#ifdef USE_SYSLOG
openlog(program_invocation_short_name, LOG_PID, LOG_AUTHPRIV);
syslog(LOG_ERR, "%s", buf);
closelog();
#else
/* Terminate with CR-LF since the console mode is unknown. */
strcat(bp, "\r\n");
if ((fd = open("/dev/console", 1)) >= 0) {
ignore_result(write(fd, buf, strlen(buf)));
close(fd);
}
#endif /* USE_SYSLOG */
/* Be kind to init(8). */
sleep(10);
exit(EXIT_FAILURE);
}