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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 <sys/wait.h>
#include <fcntl.h>
#include <stdarg.h>
#include <ctype.h>
#include <utmpx.h>
#include <getopt.h>
#include <time.h>
#include <sys/socket.h>
#include <langinfo.h>
#include <grp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <net/if.h>
#include "strutils.h"
#include "all-io.h"
#include "nls.h"
#include "pathnames.h"
#include "c.h"
#include "widechar.h"
#include "ttyutils.h"
#include "color-names.h"
#include "env.h"
#ifdef USE_PLYMOUTH_SUPPORT
# include "plymouth-ctrl.h"
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#if defined(__FreeBSD_kernel__)
# include <pty.h>
# ifdef HAVE_UTMPX_H
# include <utmp.h>
# endif
# ifdef HAVE_LIBUTIL_H
# include <libutil.h>
# endif
#endif
#ifdef __linux__
# include <sys/kd.h>
# define USE_SYSLOG
# ifndef DEFAULT_VCTERM
# define DEFAULT_VCTERM "linux"
# endif
# if defined (__s390__) || defined (__s390x__)
# define DEFAULT_TTYS0 "dumb"
# define DEFAULT_TTY32 "ibm327x"
# define DEFAULT_TTYS1 "vt220"
# endif
# ifndef DEFAULT_STERM
# define DEFAULT_STERM "vt102"
# endif
#elif defined(__GNU__)
# define USE_SYSLOG
# ifndef DEFAULT_VCTERM
# define DEFAULT_VCTERM "hurd"
# 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
#ifdef __FreeBSD_kernel__
#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: "
#define LOGIN_ARGV_MAX 16 /* Numbers of args for login */
/*
* agetty --reload
*/
#ifdef AGETTY_RELOAD
# include <sys/inotify.h>
# include <linux/netlink.h>
# include <linux/rtnetlink.h>
# define AGETTY_RELOAD_FILENAME "/run/agetty.reload" /* trigger file */
# define AGETTY_RELOAD_FDNONE -2 /* uninitialized fd */
static int inotify_fd = AGETTY_RELOAD_FDNONE;
static int netlink_fd = AGETTY_RELOAD_FDNONE;
#endif
/*
* 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 */
unsigned 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 */
char *erasechars; /* string with erase chars */
char *killchars; /* string with kill chars */
char *osrelease; /* /etc/os-release data */
unsigned int delay; /* Sleep seconds before prompt */
int nice; /* Run login with this priority */
int numspeed; /* number of baud rates to try */
int clocal; /* CLOCAL_MODE_* */
int kbmode; /* Keyboard mode if virtual console */
speed_t speeds[MAX_SPEED]; /* baud rates to be tried */
};
enum {
CLOCAL_MODE_AUTO = 0,
CLOCAL_MODE_ALWAYS,
CLOCAL_MODE_NEVER
};
#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_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 F_NOHINTS (1<<20) /* Don't print hints */
#define F_REMOTE (1<<21) /* Add '-h fakehost' to login(1) command line */
#define serial_tty_option(opt, flag) \
(((opt)->flags & (F_VCONSOLE|(flag))) == (flag))
struct Speedtab {
long speed;
speed_t code;
};
static const 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},
#elif defined(EXTA)
{19200, EXTA},
#endif
#ifdef B38400
{38400, B38400},
#elif defined(EXTB)
{38400, EXTB},
#endif
#ifdef B57600
{57600, B57600},
#endif
#ifdef B115200
{115200, B115200},
#endif
#ifdef B230400
{230400, B230400},
#endif
#ifdef B460800
{460800, B460800},
#endif
#ifdef B500000
{500000, B500000},
#endif
#ifdef B576000
{576000, B576000},
#endif
#ifdef B921600
{921600, B921600},
#endif
#ifdef B1000000
{1000000, B1000000},
#endif
#ifdef B1152000
{1152000, B1152000},
#endif
#ifdef B1500000
{1500000, B1500000},
#endif
#ifdef B2000000
{2000000, B2000000},
#endif
#ifdef B2500000
{2500000, B2500000},
#endif
#ifdef B3000000
{3000000, B3000000},
#endif
#ifdef B3500000
{3500000, B3500000},
#endif
#ifdef B4000000
{4000000, B4000000},
#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, FILE *fp);
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 ssize_t append(char *dest, size_t len, const char *sep, const char *src);
static void check_username (const char* nm);
static void login_options_to_argv(char *argv[], int *argc, char *str, char *username);
static void reload_agettys(void);
/* Fake hostname for ut_host specified on command line. */
static char *fakehost;
#ifdef DEBUGGING
# include "closestream.h"
# ifndef DEBUG_OUTPUT
# define DEBUG_OUTPUT "/dev/tty10"
# endif
# define debug(s) do { fprintf(dbf,s); fflush(dbf); } while (0)
FILE *dbf;
#else
# define debug(s) do { ; } while (0)
#endif
int main(int argc, char **argv)
{
char *username = NULL; /* login name, given to /bin/login */
struct chardata chardata; /* will be set by get_logname() */
struct termios termios; /* terminal mode bits */
struct options options = {
.flags = F_ISSUE, /* show /etc/issue (SYSV_STYLE) */
.login = _PATH_LOGIN, /* default login program */
.tty = "tty1", /* default tty line */
.issue = ISSUE /* default issue file */
};
char *login_argv[LOGIN_ARGV_MAX + 1];
int login_argc = 0;
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(DEBUG_OUTPUT, "w");
for (int i = 1; i < argc; i++) {
if (i > 1)
debug(" ");
debug(argv[i]);
}
debug("\n");
#endif /* DEBUGGING */
/* Parse command-line arguments. */
parse_args(argc, argv, &options);
login_argv[login_argc++] = options.login; /* set login program name */
/* 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());
/* Default is to follow the current line speed and then default to 9600 */
if ((options.flags & F_VCONSOLE) == 0 && options.numspeed == 0) {
options.speeds[options.numspeed++] = bcode("9600");
options.flags |= F_KEEPSPEED;
}
/* 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 (options.flags & F_VCONSOLE || options.clocal != CLOCAL_MODE_ALWAYS)
/* Go to blocking mode unless -L is specified, this change
* affects stdout, stdin and stderr as all the file descriptors
* are created by dup(). */
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(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;
}
}
INIT_CHARDATA(&chardata);
if (options.autolog) {
debug("doing auto login\n");
username = options.autolog;
}
if ((options.flags & F_NOPROMPT) == 0) {
if (options.autolog) {
/* Autologin prompt */
do_prompt(&options, &termios);
printf(_("%s%s (automatic login)\n"), LOGIN, options.autolog);
} else {
/* Read the login name. */
debug("reading login name\n");
while ((username =
get_logname(&options, &termios, &chardata)) == NULL)
if ((options.flags & F_VCONSOLE) == 0 && options.numspeed)
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);
if (username)
check_username(username);
if (options.logopt) {
/*
* The --login-options completely overwrites the default
* way how agetty composes login(1) command line.
*/
login_options_to_argv(login_argv, &login_argc,
options.logopt, username);
} else {
if (fakehost && (options.flags & F_REMOTE)) {
login_argv[login_argc++] = "-h";
login_argv[login_argc++] = fakehost;
}
if (username) {
if (options.autolog)
login_argv[login_argc++] = "-f";
else
login_argv[login_argc++] = "--";
login_argv[login_argc++] = username;
}
}
login_argv[login_argc] = NULL; /* last login argv */
if (options.chroot && chroot(options.chroot) < 0)
log_err(_("%s: can't change root directory %s: %m"),
options.tty, options.chroot);
if (options.chdir && chdir(options.chdir) < 0)
log_err(_("%s: can't change working directory %s: %m"),
options.tty, options.chdir);
if (options.nice && nice(options.nice) < 0)
log_warn(_("%s: can't change process priority: %m"),
options.tty);
free(options.osrelease);
#ifdef DEBUGGING
if (close_stream(dbf) != 0)
log_err("write failed: %s", DEBUG_OUTPUT);
#endif
/* Let the login program take care of password validation. */
execv(options.login, login_argv);
log_err(_("%s: can't exec %s: %m"), options.tty, login_argv[0]);
}
/*
* Returns : @str if \u not found
* : @username if @str equal to "\u"
* : newly allocated string if \u mixed with something other
*/
static char *replace_u(char *str, char *username)
{
char *entry = NULL, *p = str;
size_t usz = username ? strlen(username) : 0;
while (*p) {
size_t sz;
char *tp, *old = entry;
if (memcmp(p, "\\u", 2)) {
p++;
continue; /* no \u */
}
sz = strlen(str);
if (p == str && sz == 2) {
/* 'str' contains only '\u' */
free(old);
return username;
}
tp = entry = malloc(sz + usz);
if (!tp)
log_err(_("failed to allocate memory: %m"));
if (p != str) {
/* copy chars before \u */
memcpy(tp, str, p - str);
tp += p - str;
}
if (usz) {
/* copy username */
memcpy(tp, username, usz);
tp += usz;
}
if (*(p + 2))
/* copy chars after \u + \0 */
memcpy(tp, p + 2, sz - (p - str) - 1);
else
*tp = '\0';
p = tp;
str = entry;
free(old);
}
return entry ? entry : str;
}
static void login_options_to_argv(char *argv[], int *argc,
char *str, char *username)
{
char *p;
int i = *argc;
while (str && isspace(*str))
str++;
p = str;
while (p && *p && i < LOGIN_ARGV_MAX) {
if (isspace(*p)) {
*p = '\0';
while (isspace(*++p))
;
if (*p) {
argv[i++] = replace_u(str, username);
str = p;
}
} else
p++;
}
if (str && *str && i < LOGIN_ARGV_MAX)
argv[i++] = replace_u(str, username);
*argc = i;
}
#define is_speed(str) (strlen((str)) == strspn((str), "0123456789,"))
/* Parse command-line arguments. */
static void parse_args(int argc, char **argv, struct options *op)
{
int c;
enum {
VERSION_OPTION = CHAR_MAX + 1,
NOHINTS_OPTION,
NOHOSTNAME_OPTION,
LONGHOSTNAME_OPTION,
HELP_OPTION,
ERASE_CHARS_OPTION,
KILL_CHARS_OPTION,
RELOAD_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' },
{ "remote", no_argument, 0, 'E' },
{ "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' },
{ "local-line", optional_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' },
{ "login-pause", 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' },
{ "nohints", no_argument, 0, NOHINTS_OPTION },
{ "nohostname", no_argument, 0, NOHOSTNAME_OPTION },
{ "long-hostname", no_argument, 0, LONGHOSTNAME_OPTION },
{ "reload", no_argument, 0, RELOAD_OPTION },
{ "version", no_argument, 0, VERSION_OPTION },
{ "help", no_argument, 0, HELP_OPTION },
{ "erase-chars", required_argument, 0, ERASE_CHARS_OPTION },
{ "kill-chars", required_argument, 0, KILL_CHARS_OPTION },
{ NULL, 0, 0, 0 }
};
while ((c = getopt_long(argc, argv,
"8a:cC:d:Ef:hH:iI:Jl:L::mnNo: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 = strtou32_or_err(optarg, _("invalid delay argument"));
break;
case 'E':
op->flags |= F_REMOTE;
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':
/* -L and -L=always have the same meaning */
op->clocal = CLOCAL_MODE_ALWAYS;
if (optarg) {
if (strcmp(optarg, "=always") == 0)
op->clocal = CLOCAL_MODE_ALWAYS;
else if (strcmp(optarg, "=never") == 0)
op->clocal = CLOCAL_MODE_NEVER;
else if (strcmp(optarg, "=auto") == 0)
op->clocal = CLOCAL_MODE_AUTO;
else
log_err(_("invalid argument of --local-line"));
}
break;
case 'm':
op->flags |= F_PARSE;
break;
case 'n':
op->flags |= F_NOPROMPT;
break;
case 'N':
op->flags |= F_NONL;
break;
case 'o':
op->logopt = optarg;
break;
case 'p':
op->flags |= F_LOGINPAUSE;
break;
case 'P':
op->nice = strtos32_or_err(optarg, _("invalid nice argument"));
break;
case 'r':
op->chroot = optarg;
break;
case 'R':
op->flags |= F_HANGUP;
break;
case 's':
op->flags |= F_KEEPSPEED;
break;
case 't':
op->timeout = strtou32_or_err(optarg, _("invalid timeout argument"));
break;
case 'U':
op->flags |= F_LCUC;
break;
case 'w':
op->flags |= F_WAITCRLF;
break;
case NOHINTS_OPTION:
op->flags |= F_NOHINTS;
break;
case NOHOSTNAME_OPTION:
op->flags |= F_NOHOSTNAME;
break;
case LONGHOSTNAME_OPTION:
op->flags |= F_LONGHNAME;
break;
case ERASE_CHARS_OPTION:
op->erasechars = optarg;
break;
case KILL_CHARS_OPTION:
op->killchars = optarg;
break;
case RELOAD_OPTION:
reload_agettys();
exit(EXIT_SUCCESS);
case VERSION_OPTION:
printf(UTIL_LINUX_VERSION);
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 (is_speed(argv[optind])) {
/* 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 (is_speed(v)) {
parse_speeds(op, v);
optind++;
}
}
}
/* 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 = strdup(dev_name + 5);
if (!op->tty)
log_err(_("failed to allocate memory: %m"));
}
}
} 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 = strdup(dev_name + 5);
if (!op->tty)
log_err(_("failed to allocate memory: %m"));
}
}
}
}
#endif /* DO_DEVFS_FIDDLING */
debug("exiting parseargs\n");
}
/* Parse alternate baud rates. */
static void parse_speeds(struct options *op, char *arg)
{
char *cp;
char *str = strdup(arg);
if (!str)
log_err(_("failed to allocate memory: %m"));
debug("entered parse_speeds:\n");
for (cp = strtok(str, ","); cp != NULL; 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");
free(str);
}
#ifdef SYSV_STYLE
/* Update our utmp entry. */
static void update_utmp(struct options *op)
{
struct utmpx ut;
time_t t;
pid_t pid = getpid();
pid_t sid = getsid(0);
char *vcline = op->vcline;
char *line = op->tty;
struct utmpx *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.
*/
utmpxname(_PATH_UTMP);
setutxent();
/*
* 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 = getutxent()))
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_tv.tv_sec = t;
ut.ut_type = LOGIN_PROCESS;
ut.ut_pid = pid;
ut.ut_session = sid;
pututxline(&ut);
endutxent();
updwtmpx(_PATH_WTMP, &ut);
}
#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 closed = 0;
#ifndef KDGKBMODE
int serial;
#endif
/* 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;
len = snprintf(buf, sizeof(buf), "/dev/%s", tty);
if (len < 0 || (size_t)len >= sizeof(buf))
log_err(_("/dev/%s: cannot open as standard input: %m"), tty);
/* 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);
/*
* 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.
*/