* sulogin - add the possibility to reset the terminal io
This commit is contained in:
Werner Fink
parent
d80bb06fec
commit
b98dd2505c
@ -17,6 +17,7 @@
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* init - initialize console by using the macros from ttydefaults.h
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* init - add the possiblity to ignore further interrupts from keyboard
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* init - add the possiblity to set sane terminal line settings
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* sulogin - add the possibility to reset the terminal io
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sysvinit (2.88dsf) UNRELEASED; urgency=low
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160
src/sulogin.c
160
src/sulogin.c
@ -39,6 +39,7 @@
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#include <pwd.h>
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#include <shadow.h>
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#include <termios.h>
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#include <sys/ttydefaults.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#if defined(__GLIBC__)
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@ -60,49 +61,83 @@
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char *Version = "@(#)sulogin 2.85-3 23-Apr-2003 miquels@cistron.nl";
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int timeout = 0;
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int profile = 0;
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static int timeout;
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static int profile;
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static void (*saved_sigint) = SIG_DFL;
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static void (*saved_sigtstp) = SIG_DFL;
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static void (*saved_sigquit) = SIG_DFL;
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#ifndef IUCLC
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# define IUCLC 0
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#endif
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#if 0
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#if defined(SANE_TIO) && (SANE_TIO == 1)
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/*
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* Fix the tty modes and set reasonable defaults.
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* (I'm not sure if this is needed under Linux, but..)
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*/
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static
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void fixtty(void)
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{
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struct termios tty;
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int serial;
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/* Skip serial console */
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if (ioctl (0, TIOCMGET, (char*)&serial) == 0)
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goto out;
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/* Expected error */
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serial = errno = 0;
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tcgetattr(0, &tty);
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/*
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* Set or adjust tty modes.
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*/
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tty.c_iflag &= ~(INLCR|IGNCR|IUCLC);
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tty.c_iflag |= ICRNL;
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tty.c_oflag &= ~(OCRNL|OLCUC|ONOCR|ONLRET|OFILL);
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tty.c_oflag |= OPOST|ONLCR;
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tty.c_cflag |= CLOCAL;
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tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE;
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/* Use defaults of <sys/ttydefaults.h> for base settings */
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tty.c_iflag |= TTYDEF_IFLAG;
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tty.c_oflag |= TTYDEF_OFLAG;
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tty.c_lflag |= TTYDEF_LFLAG;
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tty.c_cflag |= (TTYDEF_SPEED | TTYDEF_CFLAG);
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/*
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* Set the most important characters */
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/* Sane setting, allow eight bit characters, no carriage return delay
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* the same result as `stty sane cr0 pass8'
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*/
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tty.c_cc[VINTR] = 3;
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tty.c_cc[VQUIT] = 28;
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tty.c_cc[VERASE] = 127;
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tty.c_cc[VKILL] = 24;
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tty.c_cc[VEOF] = 4;
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tty.c_cc[VTIME] = 0;
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tty.c_cc[VMIN] = 1;
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tty.c_cc[VSTART] = 17;
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tty.c_cc[VSTOP] = 19;
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tty.c_cc[VSUSP] = 26;
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tty.c_iflag |= (BRKINT | ICRNL | IMAXBEL);
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#ifdef IUTF8 /* Not defined on FreeBSD */
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tty.c_iflag |= IUTF8;
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#endif /* IUTF8 */
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tty.c_iflag &= ~(IGNBRK | INLCR | IGNCR | IXOFF | IUCLC | IXANY | ISTRIP);
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tty.c_oflag |= (OPOST | ONLCR | NL0 | CR0 | TAB0 | BS0 | VT0 | FF0);
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tty.c_oflag &= ~(OLCUC | OCRNL | ONOCR | ONLRET | OFILL | OFDEL |\
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NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
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tty.c_lflag |= (ISIG | ICANON | IEXTEN | ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE);
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tty.c_lflag &= ~(ECHONL | NOFLSH | XCASE | TOSTOP | ECHOPRT);
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tty.c_cflag |= (CREAD | CS8 | B9600);
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tty.c_cflag &= ~(PARENB);
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/* VTIME and VMIN can overlap with VEOF and VEOL since they are
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* only used for non-canonical mode. We just set the at the
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* beginning, so nothing bad should happen.
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*/
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tty.c_cc[VTIME] = 0;
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tty.c_cc[VMIN] = 1;
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tty.c_cc[VINTR] = CINTR;
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tty.c_cc[VQUIT] = CQUIT;
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tty.c_cc[VERASE] = CERASE; /* ASCII DEL (0177) */
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tty.c_cc[VKILL] = CKILL;
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tty.c_cc[VEOF] = CEOF;
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tty.c_cc[VSWTC] = _POSIX_VDISABLE;
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tty.c_cc[VSTART] = CSTART;
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tty.c_cc[VSTOP] = CSTOP;
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tty.c_cc[VSUSP] = CSUSP;
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tty.c_cc[VEOL] = _POSIX_VDISABLE;
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tty.c_cc[VREPRINT] = CREPRINT;
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tty.c_cc[VDISCARD] = CDISCARD;
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tty.c_cc[VWERASE] = CWERASE;
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tty.c_cc[VLNEXT] = CLNEXT;
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tty.c_cc[VEOL2] = _POSIX_VDISABLE;
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tcsetattr(0, TCSANOW, &tty);
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out:
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return;
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}
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#endif
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@ -110,7 +145,12 @@ void fixtty(void)
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/*
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* Called at timeout.
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*/
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void alrm_handler()
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static
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# ifdef __GNUC__
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void alrm_handler(int sig __attribute__((unused)))
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# else
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void alrm_handler(int sig)
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# endif
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{
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}
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@ -119,6 +159,7 @@ void alrm_handler()
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* password is checked for traditional-style DES and
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* FreeBSD-style MD5 encryption.
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*/
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static
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int valid(char *pass)
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{
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char *s;
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@ -157,6 +198,7 @@ int valid(char *pass)
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/*
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* Set a variable if the value is not NULL.
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*/
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static
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void set(char **var, char *val)
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{
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if (val) *var = val;
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@ -165,6 +207,7 @@ void set(char **var, char *val)
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/*
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* Get the root password entry.
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*/
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static
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struct passwd *getrootpwent(int try_manually)
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{
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static struct passwd pwd;
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@ -267,6 +310,7 @@ struct passwd *getrootpwent(int try_manually)
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* Ask for the password. Note that there is no
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* default timeout as we normally skip this during boot.
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*/
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static
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char *getpasswd(char *crypted)
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{
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struct sigaction sa;
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@ -275,11 +319,10 @@ char *getpasswd(char *crypted)
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char *ret = pass;
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int i;
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if (crypted[0])
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printf("Give root password for maintenance\n");
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else
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printf("Press enter for maintenance\n");
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printf("(or type Control-D to continue): ");
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if (crypted[0]) {
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printf("Give root password for login: ");
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} else
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printf("Press enter for login: ");
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fflush(stdout);
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tcgetattr(0, &old);
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@ -314,6 +357,7 @@ char *getpasswd(char *crypted)
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/*
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* Password was OK, execute a shell.
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*/
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static
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void sushell(struct passwd *pwd)
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{
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char shell[128];
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@ -355,9 +399,9 @@ void sushell(struct passwd *pwd)
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* Try to execute a shell.
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*/
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setenv("SHELL", sushell, 1);
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signal(SIGINT, SIG_DFL);
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signal(SIGTSTP, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGINT, saved_sigint);
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signal(SIGTSTP, saved_sigtstp);
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signal(SIGQUIT, saved_sigquit);
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#ifdef WITH_SELINUX
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if (is_selinux_enabled > 0) {
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security_context_t scon=NULL;
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@ -387,6 +431,7 @@ void sushell(struct passwd *pwd)
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perror(STATICSH);
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}
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static
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void usage(void)
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{
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fprintf(stderr, "Usage: sulogin [-e] [-p] [-t timeout] [tty device]\n");
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@ -429,14 +474,19 @@ int main(int argc, char **argv)
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/*
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* See if we need to open an other tty device.
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*/
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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saved_sigint = signal(SIGINT, SIG_IGN);
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saved_sigtstp = signal(SIGQUIT, SIG_IGN);
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saved_sigquit = signal(SIGTSTP, SIG_IGN);
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if (optind < argc) tty = argv[optind];
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if (tty) {
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if (tty || (tty = getenv("CONSOLE"))) {
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if ((fd = open(tty, O_RDWR)) < 0) {
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perror(tty);
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} else if (!isatty(fd)) {
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fd = dup(0);
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}
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if (!isatty(fd)) {
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fprintf(stderr, "%s: not a tty\n", tty);
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close(fd);
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} else {
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@ -448,7 +498,7 @@ int main(int argc, char **argv)
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pid = getpid();
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pgrp = getpgid(0);
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ppgrp = getpgid(getppid());
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ioctl(fd, TIOCGPGRP, &ttypgrp);
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ttypgrp = tcgetpgrp(fd);
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if (pgrp != ttypgrp && ppgrp != ttypgrp) {
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if (pid != getsid(0)) {
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@ -458,18 +508,28 @@ int main(int argc, char **argv)
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}
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signal(SIGHUP, SIG_IGN);
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ioctl(0, TIOCNOTTY, (char *)1);
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if (ttypgrp > 0)
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ioctl(0, TIOCNOTTY, (char *)1);
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signal(SIGHUP, SIG_DFL);
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close(0);
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close(1);
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close(2);
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close(fd);
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fd = open(tty, O_RDWR);
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ioctl(0, TIOCSCTTY, (char *)1);
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dup(fd);
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dup(fd);
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if (fd > 2)
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close(fd);
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if ((fd = open(tty, O_RDWR)) < 0) {
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perror(tty);
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} else {
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ioctl(0, TIOCSCTTY, (char *)1);
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tcsetpgrp(fd, ppgrp);
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dup2(fd, 0);
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dup2(fd, 1);
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dup2(fd, 2);
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if (fd > 2)
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close(fd);
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}
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} else
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close(fd);
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if (fd > 2)
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close(fd);
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}
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} else if (getpid() == 1) {
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/* We are init. We hence need to set a session anyway */
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@ -478,6 +538,10 @@ int main(int argc, char **argv)
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perror("ioctl(TIOCSCTTY)");
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}
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#if defined(SANE_TIO) && (SANE_TIO == 1)
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fixtty();
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#endif
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/*
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* Get the root password.
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*/
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@ -494,6 +558,9 @@ int main(int argc, char **argv)
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if (pwd->pw_passwd[0] == 0 ||
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strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd) == 0)
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sushell(pwd);
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saved_sigquit = signal(SIGQUIT, SIG_IGN);
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saved_sigtstp = signal(SIGTSTP, SIG_IGN);
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saved_sigint = signal(SIGINT, SIG_IGN);
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printf("Login incorrect.\n");
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}
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@ -502,4 +569,3 @@ int main(int argc, char **argv)
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*/
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return 0;
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}
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