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249 lines
7.5 KiB
249 lines
7.5 KiB
/* getty.c - A getty program to get controlling terminal.
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*
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* Copyright 2012 Sandeep Sharma <sandeep.jack2756@gamil.com>
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* Copyright 2013 Kyungwan Han <asura321@gmail.com>
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*
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* No Standard.
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USE_GETTY(NEWTOY(getty, "<2t#<0H:I:l:f:iwnmLh", TOYFLAG_SBIN))
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config GETTY
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bool "getty"
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default n
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help
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usage: getty [OPTIONS] BAUD_RATE[,BAUD_RATE]... TTY [TERMTYPE]
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Wait for a modem to dial into serial port, adjust baud rate, call login.
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-h Enable hardware RTS/CTS flow control
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-L Set CLOCAL (ignore Carrier Detect state)
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-m Get baud rate from modem's CONNECT status message
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-n Don't prompt for login name
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-w Wait for CR or LF before sending /etc/issue
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-i Don't display /etc/issue
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-f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue
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-l LOGIN Invoke LOGIN instead of /bin/login
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-t SEC Terminate after SEC if no login name is read
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-I INITSTR Send INITSTR before anything else
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-H HOST Log HOST into the utmp file as the hostname
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*/
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#define FOR_getty
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#include "toys.h"
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GLOBALS(
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char *f, *l, *I, *H;
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long t;
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char *tty_name, buff[128];
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int speeds[20], sc;
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struct termios termios;
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)
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#define CTL(x) ((x) ^ 0100)
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#define HOSTNAME_SIZE 32
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static void parse_speeds(char *sp)
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{
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char *ptr;
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TT.sc = 0;
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while ((ptr = strsep(&sp, ","))) {
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TT.speeds[TT.sc] = atolx_range(ptr, 0, INT_MAX);
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if (TT.speeds[TT.sc] < 0) perror_exit("bad speed %s", ptr);
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if (++TT.sc > 10) perror_exit("too many speeds, max is 10");
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}
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}
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// Get controlling terminal and redirect stdio
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static void open_tty(void)
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{
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if (strcmp(TT.tty_name, "-")) {
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if (*(TT.tty_name) != '/') TT.tty_name = xmprintf("/dev/%s", TT.tty_name);
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// Sends SIGHUP to all foreground process if Session leader don't die,Ignore
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void* handler = signal(SIGHUP, SIG_IGN);
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ioctl(0, TIOCNOTTY, 0); // Giveup if there is any controlling terminal
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signal(SIGHUP, handler);
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if ((setsid() < 0) && (getpid() != getsid(0))) perror_exit("setsid");
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xclose(0);
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xopen_stdio(TT.tty_name, O_RDWR|O_NDELAY|O_CLOEXEC);
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fcntl(0, F_SETFL, fcntl(0, F_GETFL) & ~O_NONBLOCK); // Block read
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dup2(0, 1);
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dup2(0, 2);
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if (ioctl(0, TIOCSCTTY, 1) < 0) perror_msg("ioctl(TIOCSCTTY)");
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if (!isatty(0)) perror_exit("/dev/%s: not a tty", TT.tty_name);
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chown(TT.tty_name, 0, 0); // change ownership, Hope login will change this
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chmod(TT.tty_name, 0620);
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} else { // We already have opened TTY
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if (setsid() < 0) perror_msg("setsid failed");
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if ((fcntl(0, F_GETFL) & (O_RDWR|O_RDONLY|O_WRONLY)) != O_RDWR)
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perror_exit("no read/write permission");
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}
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}
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static void termios_init(void)
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{
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if (tcgetattr(0, &TT.termios) < 0) perror_exit("tcgetattr");
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// Flush input and output queues, important for modems!
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tcflush(0, TCIOFLUSH);
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TT.termios.c_cflag &= (0|CSTOPB|PARENB|PARODD);
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#ifdef CRTSCTS
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if (FLAG(h)) TT.termios.c_cflag |= CRTSCTS;
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#endif
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if (FLAG(L)) TT.termios.c_cflag |= CLOCAL;
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TT.termios.c_cc[VTIME] = 0;
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TT.termios.c_cc[VMIN] = 1;
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TT.termios.c_oflag = OPOST|ONLCR;
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TT.termios.c_cflag |= CS8|CREAD|HUPCL|CBAUDEX;
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// login will disable echo for passwd.
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TT.termios.c_lflag |= ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOKE;
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TT.termios.c_cc[VINTR] = CTL('C');
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TT.termios.c_cc[VQUIT] = CTL('\\');
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TT.termios.c_cc[VEOF] = CTL('D');
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TT.termios.c_cc[VEOL] = '\n';
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TT.termios.c_cc[VKILL] = CTL('U');
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TT.termios.c_cc[VERASE] = 127; // CERASE
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TT.termios.c_iflag = ICRNL|IXON|IXOFF;
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// Set non-zero baud rate. Zero baud rate left it unchanged.
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if (TT.speeds[0] != 0) xsetspeed(&TT.termios, TT.speeds[0]);
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if (tcsetattr(0, TCSANOW, &TT.termios) < 0) perror_exit("tcsetattr");
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}
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// Get the baud rate from modems CONNECT mesage, Its of form <junk><BAUD><Junk>
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static void sense_baud(void)
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{
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int vmin, speed;
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ssize_t size;
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char *ptr;
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vmin = TT.termios.c_cc[VMIN]; // Store old
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TT.termios.c_cc[VMIN] = 0; // No block even queue is empty.
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if (tcsetattr(0, TCSANOW, &TT.termios) < 0) perror_exit("tcsetattr");
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size = readall(0, TT.buff, sizeof(TT.buff)-1);
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if (size > 0) {
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for (ptr = TT.buff; ptr < TT.buff+size; ptr++) {
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if (isdigit(*ptr)) {
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speed = atolx_range(ptr, 0, INT_MAX);
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if (speed > 0) xsetspeed(&TT.termios, speed);
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break;
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}
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}
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}
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TT.termios.c_cc[VMIN] = vmin; //restore old value
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if (tcsetattr(0, TCSANOW, &TT.termios) < 0) perror_exit("tcsetattr");
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}
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// Print /etc/isuue with taking care of each escape sequence
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void write_issue(char *file, struct utsname *uts)
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{
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char buff[20] = {0,};
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int fd = open(TT.f, O_RDONLY), size;
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if (fd < 0) return;
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while ((size = readall(fd, buff, 1)) > 0) {
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char *ch = buff;
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if (*ch == '\\' || *ch == '%') {
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if (readall(fd, buff, 1) <= 0) perror_exit("readall");
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if (*ch == 's') fputs(uts->sysname, stdout);
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if (*ch == 'n'|| *ch == 'h') fputs(uts->nodename, stdout);
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if (*ch == 'r') fputs(uts->release, stdout);
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if (*ch == 'm') fputs(uts->machine, stdout);
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if (*ch == 'l') fputs(TT.tty_name, stdout);
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} else xputc(*ch);
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}
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}
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// Read login name and print prompt and Issue file.
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static int read_login_name(void)
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{
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tcflush(0, TCIFLUSH); // Flush pending speed switches
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while (1) {
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struct utsname uts;
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int i = 0;
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uname(&uts);
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if (!FLAG(i)) write_issue(TT.f, &uts);
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printf("%s login: ", uts.nodename);
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xflush(1);
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TT.buff[0] = getchar();
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if (!TT.buff[0] && TT.sc > 1) return 0; // Switch speed
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if (TT.buff[0] == '\n') continue;
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if (TT.buff[0] != '\n')
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if (!fgets(&TT.buff[1], HOSTNAME_SIZE-1, stdin)) _exit(1);
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while (i < HOSTNAME_SIZE-1 && isgraph(TT.buff[i])) i++;
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TT.buff[i] = 0;
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break;
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}
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return 1;
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}
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static void utmp_entry(void)
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{
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struct utmpx entry = {.ut_pid = getpid()}, *ep;
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int fd;
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// We're responsible for ensuring that the utmp file exists.
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if (access(_PATH_UTMP, F_OK) && (fd = open(_PATH_UTMP, O_CREAT, 0664)) != -1)
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close(fd);
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// Find any existing entry.
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setutxent();
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while ((ep = getutxent()))
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if (ep->ut_pid == entry.ut_pid && ep->ut_type >= INIT_PROCESS) break;
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if (ep) entry = *ep;
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else entry.ut_type = LOGIN_PROCESS;
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// Modify.
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entry.ut_tv.tv_sec = time(0);
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xstrncpy(entry.ut_user, "LOGIN", sizeof(entry.ut_user));
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xstrncpy(entry.ut_line, ttyname(0) + strlen("/dev/"), sizeof(entry.ut_line));
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if (FLAG(H)) xstrncpy(entry.ut_host, TT.H, sizeof(entry.ut_host));
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// Write.
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pututxline(&entry);
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endutxent();
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}
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void getty_main(void)
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{
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char ch, *cmd[3] = {TT.l ? : "/bin/login", 0, 0}; // space to add username
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if (!FLAG(f)) TT.f = "/etc/issue";
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// parse arguments and set $TERM
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if (isdigit(**toys.optargs)) {
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parse_speeds(*toys.optargs);
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if (*++toys.optargs) TT.tty_name = xmprintf("%s", *toys.optargs);
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} else {
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TT.tty_name = xmprintf("%s", *toys.optargs);
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if (*++toys.optargs) parse_speeds(*toys.optargs);
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}
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if (*++toys.optargs) setenv("TERM", *toys.optargs, 1);
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open_tty();
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termios_init();
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tcsetpgrp(0, getpid());
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utmp_entry();
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if (FLAG(I)) xputsn(TT.I);
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if (FLAG(m)) sense_baud();
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if (FLAG(t)) alarm(TT.t);
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if (FLAG(w)) while (readall(0, &ch, 1) != 1) if (ch=='\n' || ch=='\r') break;
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if (!FLAG(n)) {
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int index = 1; // 0th we already set.
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for (;;) {
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if (read_login_name()) break;
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index %= TT.sc;
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xsetspeed(&TT.termios, TT.speeds[index]);
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//Necessary after cfsetspeed
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if (tcsetattr(0, TCSANOW, &TT.termios) < 0) perror_exit("tcsetattr");
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}
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cmd[1] = TT.buff; //put the username in the login command line
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}
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xexec(cmd);
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}
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