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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.
*/
/* nyagetty: modified and made standalone by q66 <q66@chimera-linux.org>
*
* single-file version, public domain like upstream version,
* 0BSD where public domain is not legally valid
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <wchar.h>
#include <wctype.h>
#include <inttypes.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 <sys/param.h>
#include <fcntl.h>
#include <stdarg.h>
#include <ctype.h>
#include <utmpx.h>
#include <getopt.h>
#include <locale.h>
#include <langinfo.h>
#include <time.h>
#include <sys/socket.h>
#include <langinfo.h>
#include <grp.h>
#include <pwd.h>
#include <err.h>
#include <paths.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/utsname.h>
#include <sys/ttydefaults.h>
#define PACKAGE_STRING "nyagetty " PACKAGE_VERSION
/* these are supported in common envs */
#define HAVE_WIDECHAR 1
#define HAVE_UTMP_H 1
#define HAVE_STRUCT_TERMIOS_C_LINE 1
#define HAVE_GETDOMAINNAME 1
/* not yet supported */
#if 0
#define ENABLE_NLS 1
#define USE_PLYMOUTH_SUPPORT 1
#define HAVE_SCANDIRAT 1
#define HAVE_OPENAT 1
#define HAVE_GETTTYNAM 1 /* glibc */
#endif
/* should be supported */
#define AGETTY_RELOAD 1
/* nls support */
#ifndef LOCALEDIR
#define LOCALEDIR "/usr/share/locale"
#endif
#ifdef ENABLE_NLS
# include <libintl.h>
# define _(Text) gettext (Text)
# define P_(Singular, Plural, n) ngettext (Singular, Plural, n)
#else
# undef bindtextdomain
# define bindtextdomain(Domain, Directory) /* empty */
# undef textdomain
# define textdomain(Domain) /* empty */
# define _(Text) (Text)
# define P_(Singular, Plural, n) ((n) == 1 ? (Singular) : (Plural))
#endif /* ENABLE_NLS */
#ifndef ALTMON_1
# define ALTMON_1 MON_1
# define ALTMON_2 MON_2
# define ALTMON_3 MON_3
# define ALTMON_4 MON_4
# define ALTMON_5 MON_5
# define ALTMON_6 MON_6
# define ALTMON_7 MON_7
# define ALTMON_8 MON_8
# define ALTMON_9 MON_9
# define ALTMON_10 MON_10
# define ALTMON_11 MON_11
# define ALTMON_12 MON_12
#endif
#ifndef _NL_ABALTMON_1
# define _NL_ABALTMON_1 ABMON_1
# define _NL_ABALTMON_2 ABMON_2
# define _NL_ABALTMON_3 ABMON_3
# define _NL_ABALTMON_4 ABMON_4
# define _NL_ABALTMON_5 ABMON_5
# define _NL_ABALTMON_6 ABMON_6
# define _NL_ABALTMON_7 ABMON_7
# define _NL_ABALTMON_8 ABMON_8
# define _NL_ABALTMON_9 ABMON_9
# define _NL_ABALTMON_10 ABMON_10
# define _NL_ABALTMON_11 ABMON_11
# define _NL_ABALTMON_12 ABMON_12
#endif
/* auxiliary paths, from pathnames.h */
#ifndef _PATH_LOGIN
# define _PATH_LOGIN "/bin/login"
#endif
#define _PATH_ISSUE_FILENAME "issue"
#define _PATH_ISSUE_DIRNAME _PATH_ISSUE_FILENAME ".d"
#define _PATH_ISSUE "/etc/" _PATH_ISSUE_FILENAME
#define _PATH_ISSUEDIR "/etc/" _PATH_ISSUE_DIRNAME
#define _PATH_OS_RELEASE_ETC "/etc/os-release"
#define _PATH_OS_RELEASE_USR "/usr/lib/os-release"
#define _PATH_NUMLOCK_ON _PATH_RUNSTATEDIR "/numlock-on"
#ifndef _PATH_LOGINDEFS
#define _PATH_LOGINDEFS "/etc/login.defs"
#endif
/*
* this comes from all-io.h
*/
static inline int write_all(int fd, const void *buf, size_t count)
{
while (count) {
ssize_t tmp;
errno = 0;
tmp = write(fd, buf, count);
if (tmp > 0) {
count -= tmp;
if (count)
buf = (const void *) ((const char *) buf + tmp);
} else if (errno != EINTR && errno != EAGAIN)
return -1;
if (errno == EAGAIN) { /* Try later, *sigh* */
struct timespec wt = {.tv_sec = 0, .tv_nsec = 250000000L};
nanosleep(&wt, NULL);
}
}
return 0;
}
static inline ssize_t read_all(int fd, char *buf, size_t count)
{
ssize_t ret;
ssize_t c = 0;
int tries = 0;
memset(buf, 0, count);
while (count > 0) {
ret = read(fd, buf, count);
if (ret < 0) {
if ((errno == EAGAIN || errno == EINTR) && (tries++ < 5)) {
struct timespec wt = {.tv_sec = 0, .tv_nsec = 250000000L};
nanosleep(&wt, NULL);
continue;
}
return c ? c : -1;
}
if (ret == 0)
return c;
tries = 0;
count -= ret;
buf += ret;
c += ret;
}
return c;
}
/*
* this comes from color-names.c/h
*/
#define UL_COLOR_RESET "\033[0m"
#define UL_COLOR_BOLD "\033[1m"
#define UL_COLOR_HALFBRIGHT "\033[2m"
#define UL_COLOR_UNDERSCORE "\033[4m"
#define UL_COLOR_BLINK "\033[5m"
#define UL_COLOR_REVERSE "\033[7m"
/* Standard colors */
#define UL_COLOR_BLACK "\033[30m"
#define UL_COLOR_RED "\033[31m"
#define UL_COLOR_GREEN "\033[32m"
#define UL_COLOR_BROWN "\033[33m" /* well, brown */
#define UL_COLOR_BLUE "\033[34m"
#define UL_COLOR_MAGENTA "\033[35m"
#define UL_COLOR_CYAN "\033[36m"
#define UL_COLOR_GRAY "\033[37m"
/* Bold variants */
#define UL_COLOR_DARK_GRAY "\033[1;30m"
#define UL_COLOR_BOLD_RED "\033[1;31m"
#define UL_COLOR_BOLD_GREEN "\033[1;32m"
#define UL_COLOR_BOLD_YELLOW "\033[1;33m"
#define UL_COLOR_BOLD_BLUE "\033[1;34m"
#define UL_COLOR_BOLD_MAGENTA "\033[1;35m"
#define UL_COLOR_BOLD_CYAN "\033[1;36m"
#define UL_COLOR_WHITE "\033[1;37m"
/* maximal length of human readable name of ESC seq. */
#define UL_COLORNAME_MAXSZ 32
struct ul_color_name {
const char *name;
const char *seq;
};
static int cmp_color_name(const void *a0, const void *b0)
{
const struct ul_color_name
*a = (const struct ul_color_name *) a0,
*b = (const struct ul_color_name *) b0;
return strcmp(a->name, b->name);
}
static const char *color_sequence_from_colorname(const char *str)
{
static const struct ul_color_name basic_schemes[] = {
{ "black", UL_COLOR_BLACK },
{ "blink", UL_COLOR_BLINK },
{ "blue", UL_COLOR_BLUE },
{ "bold", UL_COLOR_BOLD },
{ "brown", UL_COLOR_BROWN },
{ "cyan", UL_COLOR_CYAN },
{ "darkgray", UL_COLOR_DARK_GRAY },
{ "gray", UL_COLOR_GRAY },
{ "green", UL_COLOR_GREEN },
{ "halfbright", UL_COLOR_HALFBRIGHT },
{ "lightblue", UL_COLOR_BOLD_BLUE },
{ "lightcyan", UL_COLOR_BOLD_CYAN },
{ "lightgray,", UL_COLOR_GRAY },
{ "lightgreen", UL_COLOR_BOLD_GREEN },
{ "lightmagenta", UL_COLOR_BOLD_MAGENTA },
{ "lightred", UL_COLOR_BOLD_RED },
{ "magenta", UL_COLOR_MAGENTA },
{ "red", UL_COLOR_RED },
{ "reset", UL_COLOR_RESET, },
{ "reverse", UL_COLOR_REVERSE },
{ "yellow", UL_COLOR_BOLD_YELLOW },
{ "white", UL_COLOR_WHITE }
};
struct ul_color_name key = { .name = str }, *res;
if (!str)
return NULL;
res = bsearch(&key, basic_schemes, sizeof(basic_schemes) / sizeof(basic_schemes[0]),
sizeof(struct ul_color_name),
cmp_color_name);
return res ? res->seq : NULL;
}
/*
* this comes from strutils.c/h
*/
static int ul_strtos64(const char *str, int64_t *num, int base)
{
char *end = NULL;
if (str == NULL || *str == '\0')
return -(errno = EINVAL);
errno = 0;
*num = (int64_t) strtoimax(str, &end, base);
if (errno != 0)
return -errno;
if (str == end || (end && *end))
return -(errno = EINVAL);
return 0;
}
static int ul_strtou64(const char *str, uint64_t *num, int base)
{
char *end = NULL;
int64_t tmp;
if (str == NULL || *str == '\0')
return -(errno = EINVAL);
/* we need to ignore negative numbers, note that for invalid negative
* number strtoimax() returns negative number too, so we do not
* need to check errno here */
errno = 0;
tmp = (int64_t) strtoimax(str, &end, base);
if (tmp < 0)
errno = ERANGE;
else {
errno = 0;
*num = strtoumax(str, &end, base);
}
if (errno != 0)
return -errno;
if (str == end || (end && *end))
return -(errno = EINVAL);
return 0;
}
static int64_t str2num_or_err(const char *str, int base, const char *errmesg,
int64_t low, int64_t up)
{
int64_t num = 0;
int rc;
rc = ul_strtos64(str, &num, base);
if (rc == 0 && ((low && num < low) || (up && num > up)))
rc = -(errno = ERANGE);
if (rc) {
if (errno == ERANGE)
err(EXIT_FAILURE, "%s: '%s'", errmesg, str);
errx(EXIT_FAILURE, "%s: '%s'", errmesg, str);
}
return num;
}
static uint64_t str2unum_or_err(const char *str, int base, const char *errmesg, uint64_t up)
{
uint64_t num = 0;
int rc;
rc = ul_strtou64(str, &num, base);
if (rc == 0 && (up && num > up))
rc = -(errno = ERANGE);
if (rc) {
if (errno == ERANGE)
err(EXIT_FAILURE, "%s: '%s'", errmesg, str);
errx(EXIT_FAILURE, "%s: '%s'", errmesg, str);
}
return num;
}
#define strtos32_or_err(_s, _e) (int32_t) str2num_or_err(_s, 10, _e, INT32_MIN, INT32_MAX)
#define strtou32_or_err(_s, _e) (uint32_t) str2unum_or_err(_s, 10, _e, UINT32_MAX)
/* This is like strncpy(), but based on memcpy(), so compilers and static
* analyzers do not complain when sizeof(destination) is the same as 'n' and
* result is not terminated by zero.
*
* Use this function to copy string to logs with fixed sizes (wtmp/utmp. ...)
* where string terminator is optional.
*/
static inline void * __attribute__((nonnull (1)))
str2memcpy(void *dest, const char *src, size_t n)
{
size_t bytes = strlen(src) + 1;
if (bytes > n)
bytes = n;
memcpy(dest, src, bytes);
return dest;
}
/*
* this comes from ttyutils.c/h
*/
/* 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 */
/* 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 */
};
#define INIT_CHARDATA(ptr) do { \
(ptr)->erase = DEF_ERASE; \
(ptr)->kill = DEF_KILL; \
(ptr)->eol = CR; \
(ptr)->parity = 0; \
(ptr)->capslock = 0; \
} while (0)
static int get_terminal_stdfd(void)
{
if (isatty(STDIN_FILENO))
return STDIN_FILENO;
if (isatty(STDOUT_FILENO))
return STDOUT_FILENO;
if (isatty(STDERR_FILENO))
return STDERR_FILENO;
return -EINVAL;
}
static int get_terminal_name(const char **path,
const char **name,
const char **number)
{
const char *tty;
const char *p;
int fd;
if (name)
*name = NULL;
if (path)
*path = NULL;
if (number)
*number = NULL;
fd = get_terminal_stdfd();
if (fd < 0)
return fd; /* error */
tty = ttyname(fd);
if (!tty)
return -1;
if (path)
*path = tty;
if (name || number)
tty = strncmp(tty, "/dev/", 5) == 0 ? tty + 5 : tty;
if (name)
*name = tty;
if (number) {
for (p = tty; p && *p; p++) {
if (isdigit(*p)) {
*number = p;
break;
}
}
}
return 0;
}
#define UL_TTY_KEEPCFLAGS (1 << 1)
#define UL_TTY_UTF8 (1 << 2)
static inline void reset_virtual_console(struct termios *tp, int flags)
{
/* Use defaults of <sys/ttydefaults.h> for base settings */
tp->c_iflag |= TTYDEF_IFLAG;
tp->c_oflag |= TTYDEF_OFLAG;
tp->c_lflag |= TTYDEF_LFLAG;
if ((flags & UL_TTY_KEEPCFLAGS) == 0) {
tp->c_lflag &= ~CBAUD;
tp->c_cflag |= (B38400 | TTYDEF_CFLAG);
}
/* Sane setting, allow eight bit characters, no carriage return delay
* the same result as `stty sane cr0 pass8'
*/
tp->c_iflag |= (BRKINT | ICRNL | IMAXBEL);
tp->c_iflag &= ~(IGNBRK | INLCR | IGNCR | IXOFF | IUCLC | IXANY | ISTRIP);
tp->c_oflag |= (OPOST | ONLCR | NL0 | CR0 | TAB0 | BS0 | VT0 | FF0);
tp->c_oflag &= ~(OLCUC | OCRNL | ONOCR | ONLRET | OFILL | \
NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
tp->c_lflag |= (ISIG | ICANON | IEXTEN | ECHO|ECHOE|ECHOK|ECHOKE|ECHOCTL);
tp->c_lflag &= ~(ECHONL|ECHOPRT | NOFLSH | TOSTOP);
if ((flags & UL_TTY_KEEPCFLAGS) == 0) {
tp->c_cflag |= (CREAD | CS8 | HUPCL);
tp->c_cflag &= ~(PARODD | PARENB);
}
tp->c_oflag &= ~OFDEL;
tp->c_lflag &= ~XCASE;
if (flags & UL_TTY_UTF8)
tp->c_iflag |= IUTF8; /* Set UTF-8 input flag */
else
tp->c_iflag &= ~IUTF8;
/* VTIME and VMIN can overlap with VEOF and VEOL since they are
* only used for non-canonical mode. We just set the at the
* beginning, so nothing bad should happen.
*/
tp->c_cc[VTIME] = 0;
tp->c_cc[VMIN] = 1;
tp->c_cc[VINTR] = CINTR;
tp->c_cc[VQUIT] = CQUIT;
tp->c_cc[VERASE] = CERASE; /* ASCII DEL (0177) */
tp->c_cc[VKILL] = CKILL;
tp->c_cc[VEOF] = CEOF;
tp->c_cc[VSWTC] = _POSIX_VDISABLE;
tp->c_cc[VSTART] = CSTART;
tp->c_cc[VSTOP] = CSTOP;
tp->c_cc[VSUSP] = CSUSP;
tp->c_cc[VEOL] = _POSIX_VDISABLE;
tp->c_cc[VREPRINT] = CREPRINT;
tp->c_cc[VDISCARD] = CDISCARD;
tp->c_cc[VWERASE] = CWERASE;
tp->c_cc[VLNEXT] = CLNEXT;
tp->c_cc[VEOL2] = _POSIX_VDISABLE;
}
/* parse the one value we need from login.defs, it's a hacky parse but
* does pretty much the same job as the upstream util-linux code
*/
static int get_login_plain_prompt(void)
{
FILE *f = fopen(_PATH_LOGINDEFS, "r");
if (!f) return 0;
ssize_t nread;
size_t len = 0;
char *line = NULL;
int result = 0;
while ((nread = getline(&line, &len, f)) != -1)
{
char *cmt = strchr(line, '#');
/* drop comment */
if (cmt) *cmt = '\0';
char *ln = line;
/* strip spaces at the beginning */
while (*ln && isspace(*ln)) ++ln;
/* check if this matches the value we want */
if (strncmp(ln, "LOGIN_PLAIN_PROMPT", sizeof("LOGIN_PLAIN_PROMPT") - 1))
continue;
/* if it matches, try getting the value */
ln += sizeof("LOGIN_PLAIN_PROMPT") - 1;
while (*ln && isspace(*ln)) ++ln;
/* check the value */
if (strncmp(ln, "yes", 3)) goto do_free;
/* check trailing part */
ln += 3;
while (*ln && isspace(*ln)) ++ln;
result = (*ln == '\0');
break;
}
do_free:
free(line);
fclose(f);
return result;
}
/* FROM THIS POINT IS ORIGINAL AGETTY SOURCE (only slightly modified) */
#ifdef USE_PLYMOUTH_SUPPORT
# include "plymouth-ctrl.h"
#endif
#ifdef HAVE_GETTTYNAM
# include <ttyent.h>
#endif
#if defined(__FreeBSD_kernel__)
# include <pty.h>
# ifdef HAVE_UTMP_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_SUPPORT 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_SUPPORT
# if defined(HAVE_SCANDIRAT) && defined(HAVE_OPENAT)
# include <dirent.h>
# include "fileutils.h"
# define ISSUEDIR_SUPPORT
# define ISSUEDIR_EXT ".issue"
# define ISSUEDIR_EXTSIZ (sizeof(ISSUEDIR_EXT) - 1)
# endif
#else
# error "this should not be encountered"
#endif
/* Login prompt. */
#define LOGIN_PROMPT "login: "
/* Numbers of args for login(1) */
#define LOGIN_ARGV_MAX 16
/*
* 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;
static uint32_t netlink_groups;
#endif
struct issue {
FILE *output;
char *mem;
size_t mem_sz;
#ifdef AGETTY_RELOAD
char *mem_old;
#endif
unsigned int do_tcsetattr : 1,
do_tcrestore : 1;
};
/*
* 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 */
const char *tty; /* name of tty */
const char *vcline; /* line of virtual console */
char *term; /* terminal type */
char *initstring; /* modem init string */
char *issue; /* alternative issue file or directory */
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 */
int tty_is_stdin; /* is the tty the standard input stream */
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 or /etc/issue.d */
#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_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(const 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, int canon);
static void auto_baud(struct termios *tp);
static void list_speeds(void);
static void output_special_char (struct issue *ie, unsigned char c, struct options *op,
struct termios *tp, FILE *fp);
static void do_prompt(struct issue *ie, struct options *op, struct termios *tp);
static void next_speed(struct options *op, struct termios *tp);
static char *get_logname(struct issue *ie, 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(void) __attribute__((__noreturn__));
static void exit_slowly(int code) __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);
static void print_issue_file(struct issue *ie, struct options *op, struct termios *tp);
static void eval_issue_file(struct issue *ie, struct options *op, struct termios *tp);
static void show_issue(struct options *op);
/* 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 */
};
struct issue issue = {
.mem = NULL,
};
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
{
int i;
dbf = fopen(DEBUG_OUTPUT, "w");
for (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 (options.flags & 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))