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agetty.c
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agetty.c
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/*
* 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>
* Adopt the mingetty features for a better support
* of virtual consoles by Werner Fink <werner@suse.de>
*
* 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/ioctl.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 <langinfo.h>
#include <grp.h>
#include "strutils.h"
#include "writeall.h"
#include "nls.h"
#include "pathnames.h"
#include "c.h"
#include "xalloc.h"
#include "widechar.h"
#ifdef __linux__
# include <sys/kd.h>
# include <sys/param.h>
# define USE_SYSLOG
# ifndef DEFAULT_VCTERM
# define DEFAULT_VCTERM "linux"
# endif
# ifndef DEFAULT_STERM
# define DEFAULT_STERM "vt102"
# endif
#else
# ifndef DEFAULT_VCTERM
# define DEFAULT_VCTERM "vt100"
# endif
# ifndef DEFAULT_STERM
# define DEFAULT_STERM "vt100"
# endif
#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: "
#define ARRAY_SIZE_MAX 16 /* Numbers of args for login beside "-- \\u" */
/* 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 *autolog; /* login the user automatically */
char *chdir; /* Chdir before the login */
char *chroot; /* Chroot before the login */
char *login; /* login program */
char *logopt; /* options for login program */
char *tty; /* name of tty */
char *vcline; /* line of virtual console */
char *term; /* terminal type */
char *initstring; /* modem init string */
char *issue; /* alternative issue file */
int delay; /* Sleep seconds before prompt */
int nice; /* Run login with this priority */
int numspeed; /* number of baud rates to try */
speed_t speeds[MAX_SPEED]; /* baud rates to be tried */
};
#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 */
#define F_EIGHTBITS (1<<11) /* Assume 8bit-clean tty */
#define F_VCONSOLE (1<<12) /* This is a virtual console */
#define F_HANGUP (1<<13) /* Do call vhangup(2) */
#define F_UTF8 (1<<14) /* We can do UTF8 */
#define F_LOGINPAUSE (1<<15) /* Wait for any key before dropping login prompt */
#define F_NOCLEAR (1<<16) /* Do not clear the screen before prompting */
#define F_NONL (1<<17) /* No newline before issue */
#define F_NOHOSTNAME (1<<18) /* Do not show the hostname */
#define F_LONGHNAME (1<<19) /* Show Full qualified hostname */
#define serial_tty_option(opt, flag) \
(((opt)->flags & (F_VCONSOLE|(flag))) == (flag))
/* 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;
speed_t 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 init_special_char(char* arg, struct options *op);
static void parse_args(int argc, char **argv, struct options *op);
static void parse_speeds(struct options *op, char *arg);
static void update_utmp(struct options *op);
static void open_tty(char *tty, struct termios *tp, struct options *op);
static void termio_init(struct options *op, struct termios *tp);
static void reset_vc (const struct options *op, struct termios *tp);
static void auto_baud(struct termios *tp);
static void output_special_char (unsigned char c, struct options *op, 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 speed_t bcode(char *s);
static void usage(FILE * out) __attribute__((__noreturn__));
static void log_err(const char *, ...) __attribute__((__noreturn__)) __attribute__((__format__(printf, 1, 2)));
static void log_warn (const char *, ...) __attribute__((__format__(printf, 1, 2)));
static void checkname (const char* nm);
static void replacename (char** arr, const char* nm);
static void mkarray (char** arr, char* str);
/* Fake hostname for ut_host specified on command line. */
static char *fakehost;
#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 */
char logcmd[NAME_MAX+1];
char *logarr[ARRAY_SIZE_MAX + 2]; /* arguments plus "-- \\u" */
struct chardata chardata; /* will be set by get_logname() */
struct termios termios; /* terminal mode bits */
static struct options options = {
.flags = F_ISSUE, /* show /etc/issue (SYSV_STYLE) */
.login = _PATH_LOGIN, /* default login program */
.logopt = "-- \\u", /* escape for user name */
.tty = "tty1", /* default tty line */
.term = DEFAULT_VCTERM, /* terminal type */
.issue = ISSUE /* default issue file */
};
struct sigaction sa, sa_hup, sa_quit, sa_int;
sigset_t set;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
/* In case vhangup(2) has to called */
sa.sa_handler = SIG_IGN;
sa.sa_flags = SA_RESTART;
sigemptyset (&sa.sa_mask);
sigaction(SIGHUP, &sa, &sa_hup);
sigaction(SIGQUIT, &sa, &sa_quit);
sigaction(SIGINT, &sa, &sa_int);
#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);
/* Update the utmp file. */
#ifdef SYSV_STYLE
update_utmp(&options);
#endif
if (options.delay)
sleep(options.delay);
debug("calling open_tty\n");
/* Open the tty as standard { input, output, error }. */
open_tty(options.tty, &termios, &options);
/* Unmask SIGHUP if inherited */
sigemptyset(&set);
sigaddset(&set, SIGHUP);
sigprocmask(SIG_UNBLOCK, &set, NULL);
sigaction(SIGHUP, &sa_hup, NULL);
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 (serial_tty_option(&options, F_INITSTRING) &&
options.initstring && *options.initstring != '\0') {
debug("writing init string\n");
write_all(STDOUT_FILENO, options.initstring,
strlen(options.initstring));
}
if (!serial_tty_option(&options, 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 (serial_tty_option(&options, 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 (serial_tty_option(&options, 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) == 0) {
if (options.autolog) {
/* Do the auto login */
debug("doing auto login\n");
do_prompt(&options, &termios);
printf ("%s%s (automatic login)\n", LOGIN, options.autolog);
logname = options.autolog;
options.logopt = "-f \\u";
} else {
/* Read the login name. */
debug("reading login name\n");
while ((logname =
get_logname(&options, &termios, &chardata)) == 0)
if ((options.flags & F_VCONSOLE) == 0)
next_speed(&options, &termios);
}
}
/* Disable timer. */
if (options.timeout)
alarm(0);
if ((options.flags & F_VCONSOLE) == 0) {
/* Finalize the termios settings. */
termio_final(&options, &termios, &chardata);
/* Now the newline character should be properly written. */
write_all(STDOUT_FILENO, "\r\n", 2);
}
sigaction (SIGQUIT, &sa_quit, NULL);
sigaction (SIGINT, &sa_int, NULL);
strncpy(logcmd, options.login, NAME_MAX);
strncat(logcmd, " ", NAME_MAX - strlen(logcmd));
strncat(logcmd, options.logopt, NAME_MAX - strlen(logcmd));
checkname(logname);
mkarray(logarr, logcmd);
replacename(logarr, logname);
if (options.chroot) {
if (chroot(options.chroot) < 0)
log_err(_("%s: can't change root directory %s: %m"),
options.tty, options.chroot);
}
if (options.chdir) {
if (chdir(options.chdir) < 0)
log_err(_("%s: can't change working directory %s: %m"),
options.tty, options.chdir);
}
if (options.nice) {
if (nice(options.nice) < 0)
log_warn(_("%s: can't change process priority: %m"),
options.tty);
}
/* Let the login program take care of password validation. */
execv(options.login, logarr);
log_err(_("%s: can't exec %s: %m"), options.tty, options.login);
}
/* Parse command-line arguments. */
static void parse_args(int argc, char **argv, struct options *op)
{
extern char *optarg;
extern int optind;
int c;
enum {
VERSION_OPTION = CHAR_MAX + 1,
NOHOSTNAME_OPTION,
LONGHOSTNAME_OPTION,
HELP_OPTION
};
const struct option longopts[] = {
{ "8bits", no_argument, 0, '8' },
{ "autologin", required_argument, 0, 'a' },
{ "noreset", no_argument, 0, 'c' },
{ "chdir", required_argument, 0, 'C' },
{ "delay", required_argument, 0, 'd' },
{ "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' },
{ "noclear", no_argument, 0, 'J' },
{ "login-program", required_argument, 0, 'l' },
{ "login", required_argument, 0, 'l' }, /* compat option */
{ "loginprog", required_argument, 0, 'l' }, /* compat option */
{ "local-line", no_argument, 0, 'L' },
{ "extract-baud", no_argument, 0, 'm' },
{ "skip-login", no_argument, 0, 'n' },
{ "nonewline", no_argument, 0, 'N' },
{ "login-options", required_argument, 0, 'o' },
{ "loginopts", required_argument, 0, 'o' }, /* compat option */
{ "logopts", required_argument, 0, 'o' }, /* compat option */
{ "loginpause", no_argument, 0, 'p' },
{ "nice", required_argument, 0, 'P' },
{ "chroot", required_argument, 0, 'r' },
{ "hangup", no_argument, 0, 'R' },
{ "keep-baud", no_argument, 0, 's' },
{ "timeout", required_argument, 0, 't' },
{ "detect-case", no_argument, 0, 'U' },
{ "wait-cr", no_argument, 0, 'w' },
{ "no-hostname", no_argument, 0, NOHOSTNAME_OPTION },
{ "nohostname", no_argument, 0, NOHOSTNAME_OPTION }, /* compat option */
{ "long-hostname", no_argument, 0, LONGHOSTNAME_OPTION },
{ "version", no_argument, 0, VERSION_OPTION },
{ "help", no_argument, 0, HELP_OPTION },
{ NULL, 0, 0, 0 }
};
while ((c = getopt_long(argc, argv, "8a:cC:d:f:hH:iI:Jl:LmnNo:pP:r:Rst:Uw", longopts,
NULL)) != -1) {
switch (c) {
case '8':
op->flags |= F_EIGHTBITS;
break;
case 'a':
op->autolog = optarg;
break;
case 'c':
op->flags |= F_KEEPCFLAGS;
break;
case 'C':
op->chdir = optarg;
break;
case 'd':
op->delay = atoi(optarg);
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':
init_special_char(optarg, op);
op->flags |= F_INITSTRING;
break;
case 'J':
op->flags |= F_NOCLEAR;
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 'o':
op->logopt = optarg;
break;
case 'p':
op->flags |= F_LOGINPAUSE;
break;
case 'P':
op->nice = atoi(optarg);
break;
case 'r':
op->chroot = optarg;
break;
case 'R':
op->flags |= F_HANGUP;
break;
case 's':
op->flags |= F_KEEPSPEED;
break;
case 't':
if ((op->timeout = atoi(optarg)) <= 0)
log_err(_("bad timeout value: %s"), optarg);
break;
case 'U':
op->flags |= F_LCUC;
break;
case 'w':
op->flags |= F_WAITCRLF;
break;
case NOHOSTNAME_OPTION:
op->flags |= F_NOHOSTNAME;
break;
case LONGHOSTNAME_OPTION:
op->flags |= F_LONGHNAME;
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 + 1) {
log_warn(_("not enough arguments"));
usage(stderr);
}
/* Accept "tty", "baudrate tty", and "tty baudrate". */
if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
/* Assume BSD style speed. */
parse_speeds(op, argv[optind++]);
if (argc < optind + 1) {
warn(_("not enough arguments"));
usage(stderr);
}
op->tty = argv[optind++];
} else {
op->tty = argv[optind++];
if (argc > optind) {
char *v = argv[optind++];
if ('0' <= *v && *v <= '9')
parse_speeds(op, v);
else
op->speeds[op->numspeed++] = bcode("9600");
}
}
/* On virtual console remember the line which is used for */
if (strncmp(op->tty, "tty", 3) == 0 &&
strspn(op->tty + 3, "0123456789") == strlen(op->tty+3))
op->vcline = op->tty+3;
if (argc > optind && argv[optind])
op->term = argv[optind];
#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. */
static 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)
log_err(_("bad speed: %s"), cp);
if (op->numspeed >= MAX_SPEED)
log_err(_("too many alternate speeds"));
}
debug("exiting parsespeeds\n");
}
#ifdef SYSV_STYLE
/* Update our utmp entry. */
static void update_utmp(struct options *op)
{
struct utmp ut;
time_t t;
pid_t pid = getpid();
pid_t sid = getsid(0);
char *vcline = op->vcline;
char *line = op->tty;
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 my pid 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 == pid
&& 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));
if (vcline && *vcline)
/* Standard virtual console devices */
strncpy (ut.ut_id, vcline, sizeof (ut.ut_id));
else {
size_t len = strlen(line);
char * ptr;
if (len >= sizeof (ut.ut_id))
ptr = line + len - sizeof (ut.ut_id);
else
ptr = line;
strncpy (ut.ut_id, ptr, 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 = pid;
ut.ut_session = sid;
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) {
write_all(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. */
static void open_tty(char *tty, struct termios *tp, struct options *op)
{
const pid_t pid = getpid();
int serial;
/* Set up new standard input, unless we are given an already opened port. */
if (strcmp(tty, "-") != 0) {
char buf[PATH_MAX+1];
struct group *gr = NULL;
struct stat st;
int fd, len;
pid_t tid;
gid_t gid = 0;
/* Use tty group if available */
if ((gr = getgrnam("tty")))
gid = gr->gr_gid;
if (((len = snprintf(buf, sizeof(buf), "/dev/%s", tty)) >= (int)sizeof(buf)) || (len < 0))
log_err(_("/dev/%s: cannot open as standard input: %m"), tty);
/*
* There is always a race between this reset and the call to
* vhangup() that s.o. can use to get access to your tty.
* Linux login(1) will change tty permissions. Use root owner and group
* with permission -rw------- for the period between getty and login.
*/
if (chown (buf, 0, gid) || chmod (buf, (gid ? 0660 : 0600))) {
if (errno == EROFS)
log_warn("%s: %m", buf);
else
log_err("%s: %m", buf);
}
/* Open the tty as standard input. */
if ((fd = open(buf, O_RDWR|O_NOCTTY|O_NONBLOCK, 0)) < 0)
log_err(_("/dev/%s: cannot open as standard input: %m"), tty);
/* Sanity checks... */
if (!isatty (fd))
log_err(_("/dev/%s: not a character device"), tty);
if (fstat(fd, &st) < 0)
log_err ("%s: %m", buf);
if ((st.st_mode & S_IFMT) != S_IFCHR)
log_err(_("/dev/%s: not a character device"), tty);
if (((tid = tcgetsid(fd)) < 0) || (pid != tid)) {
if (ioctl (fd, TIOCSCTTY, 1) == -1)
log_err("/dev/%s: cannot get controlling tty: %m", tty);
}
if (op->flags & F_HANGUP) {
/*
* vhangup() will replace all open file descriptors in the kernel
* that point to our controlling tty by a dummy that will deny
* further reading/writing to our device. It will also reset the
* tty to sane defaults, so we don't have to modify the tty device
* for sane settings. We also get a SIGHUP/SIGCONT.
*/
if (vhangup())
log_err("/dev/%s: vhangup() failed: %m", tty);
(void)ioctl(fd, TIOCNOTTY);
}
(void) close(fd);
close(STDIN_FILENO);
errno = 0;
debug("open(2)\n");
if (open(buf, O_RDWR|O_NOCTTY|O_NONBLOCK, 0) != 0)
log_err(_("/dev/%s: cannot open as standard input: %m"), tty);
if (((tid = tcgetsid(STDIN_FILENO)) < 0) || (pid != tid)) {
if (ioctl (STDIN_FILENO, TIOCSCTTY, 1) == -1)
log_err("/dev/%s: cannot get controlling tty: %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)
log_err(_("%s: not open for read/write"), tty);
}
if (tcsetpgrp(STDIN_FILENO, pid))
log_err("/dev/%s: cannot set process group: %m", tty);
/* Get rid of the present outputs. */
close(STDOUT_FILENO);
close(STDERR_FILENO);
errno = 0;
/* 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)
log_err(_("%s: dup problem: %m"), tty);
/* make stdio unbuffered for slow modem lines */
setvbuf(stdout, NULL, _IONBF, 0);
/*
* 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
*/
memset(tp, 0, sizeof(struct termios));
if (tcgetattr(STDIN_FILENO, tp) < 0)
log_err("%s: tcgetattr: %m", tty);
/*
* Detect if this is a virtual console or serial/modem line.
* In case of a virtual console the ioctl TIOCMGET fails and
* the error number will be set to EINVAL.
*/
if (ioctl(STDIN_FILENO, TIOCMGET, &serial) < 0 && (errno = EINVAL)) {
op->flags |= F_VCONSOLE;
if (!op->term)
op->term = DEFAULT_VCTERM;
} else if (!op->term)
op->term = DEFAULT_STERM;
setenv("TERM", op->term, 1);
}
/* Initialize termios settings. */
static void termio_init(struct options *op, struct termios *tp)
{
speed_t ispeed, ospeed;
struct winsize ws;
if (op->flags & F_VCONSOLE) {
#if defined(IUTF8) && defined(KDGKBMODE)
int mode;
/* Detect mode of current keyboard setup, e.g. for UTF-8 */
if (ioctl(STDIN_FILENO, KDGKBMODE, &mode) < 0)
mode = K_RAW;
switch(mode) {
case K_UNICODE:
setlocale(LC_CTYPE, "en_US.UTF-8");
op->flags |= F_UTF8;
break;
case K_RAW:
case K_MEDIUMRAW:
case K_XLATE:
default:
setlocale(LC_CTYPE, "POSIX");
op->flags &= ~F_UTF8;
break;
}
#else
setlocale(LC_CTYPE, "POSIX");
op->flags &= ~F_UTF8;
#endif
reset_vc(op, tp);
if ((tp->c_cflag & (CS8|PARODD|PARENB)) == CS8)
op->flags |= F_EIGHTBITS;
if ((op->flags & F_NOCLEAR) == 0) {
/*
* Do not write a full reset (ESC c) because this destroys
* the unicode mode again if the terminal was in unicode
* mode. Also it clears the CONSOLE_MAGIC features which
* are required for some languages/console-fonts.
* Just put the cursor to the home position (ESC [ H),
* erase everything below the cursor (ESC [ J), and set the
* scrolling region to the full window (ESC [ r)
*/
write_all(STDOUT_FILENO, "\033[r\033[H\033[J", 9);
}
return;
}
if (op->flags & F_KEEPSPEED) {
/* Save the original setting. */
ispeed = cfgetispeed(tp);
ospeed = cfgetospeed(tp);
if (!ispeed) ispeed = TTYDEF_SPEED;
if (!ospeed) ospeed = TTYDEF_SPEED;
} 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) == 0)
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;
/* Check for terminal size and if not found set default */
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0) {
int set = 0;
if (ws.ws_row == 0) {
ws.ws_row = 24;
set++;
}
if (ws.ws_col == 0) {
ws.ws_col = 80;
set++;
}
(void)ioctl(STDIN_FILENO, TIOCSWINSZ, &ws);