| /* vi: set sw=4 ts=4: */ |
| /* agetty.c - another getty program for Linux. By W. Z. Venema 1989 |
| * Ported to Linux by Peter Orbaek <poe@daimi.aau.dk> |
| * This program is freely distributable. The entire man-page used to |
| * be here. Now read the real man-page agetty.8 instead. |
| * |
| * option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95 |
| * |
| * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org> |
| * - added Native Language Support |
| |
| * 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net> |
| * - enable hardware flow control before displaying /etc/issue |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| * |
| */ |
| |
| #include "busybox.h" |
| |
| #ifdef CONFIG_FEATURE_UTMP |
| #include <utmp.h> |
| #endif |
| |
| #define _PATH_LOGIN "/bin/login" |
| |
| /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */ |
| #ifdef CONFIG_SYSLOGD |
| #include <sys/param.h> |
| #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. |
| */ |
| |
| #ifdef LOGIN_PROCESS /* defined in System V utmp.h */ |
| #define SYSV_STYLE /* select System V style getty */ |
| #ifdef CONFIG_FEATURE_WTMP |
| extern void updwtmp(const char *filename, const struct utmp *ut); |
| #endif |
| #endif /* LOGIN_PROCESS */ |
| |
| /* |
| * Things you may want to modify. |
| * |
| * 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. |
| */ |
| |
| #ifdef SYSV_STYLE |
| #include <sys/utsname.h> |
| #include <time.h> |
| #endif |
| |
| /* 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. |
| */ |
| #define ISSUE "/etc/issue" /* displayed before the login prompt */ |
| |
| /* 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 this. */ |
| |
| #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 '\n' |
| #define DEF_SWITCH 0 /* default switch char */ |
| |
| /* |
| * SunOS 4.1.1 termio is broken. We must use the termios stuff instead, |
| * because the termio -> termios translation does not clear the termios |
| * CIBAUD bits. Therefore, the tty driver would sometimes report that input |
| * baud rate != output baud rate. I did not notice that problem with SunOS |
| * 4.1. We will use termios where available, and termio otherwise. |
| */ |
| |
| /* linux 0.12 termio is broken too, if we use it c_cc[VERASE] isn't set |
| properly, but all is well if we use termios?! */ |
| |
| #ifdef TCGETS |
| #undef TCGETA |
| #undef TCSETA |
| #undef TCSETAW |
| #define termio termios |
| #define TCGETA TCGETS |
| #define TCSETA TCSETS |
| #define TCSETAW TCSETSW |
| #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 */ |
| int timeout; /* time-out period */ |
| char *login; /* login program */ |
| char *tty; /* name of tty */ |
| char *initstring; /* modem init string */ |
| char *issue; /* alternative issue file */ |
| int numspeed; /* number of baud rates to try */ |
| int speeds[MAX_SPEED]; /* baud rates to be tried */ |
| }; |
| |
| static const char opt_string[] = "I:LH:f:hil:mt:wn"; |
| #define F_INITSTRING (1<<0) /* initstring is set */ |
| #define F_LOCAL (1<<1) /* force local */ |
| #define F_FAKEHOST (1<<2) /* force fakehost */ |
| #define F_CUSTISSUE (1<<3) /* give alternative issue file */ |
| #define F_RTSCTS (1<<4) /* enable RTS/CTS flow control */ |
| #define F_ISSUE (1<<5) /* display /etc/issue */ |
| #define F_LOGIN (1<<6) /* non-default login program */ |
| #define F_PARSE (1<<7) /* process modem status messages */ |
| #define F_TIMEOUT (1<<8) /* time out */ |
| #define F_WAITCRLF (1<<9) /* wait for CR or LF */ |
| #define F_NOPROMPT (1<<10) /* don't ask for login name! */ |
| |
| /* 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. */ |
| |
| static struct chardata init_chardata = { |
| DEF_ERASE, /* default erase character */ |
| DEF_KILL, /* default kill character */ |
| 13, /* default eol char */ |
| 0, /* space parity */ |
| 0, /* no capslock */ |
| }; |
| |
| #if 0 |
| struct Speedtab { |
| long speed; |
| int 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}, |
| }; |
| #endif |
| |
| |
| #ifdef SYSV_STYLE |
| #ifdef CONFIG_FEATURE_UTMP |
| static void update_utmp(char *line); |
| #endif |
| #endif |
| |
| /* The following is used for understandable diagnostics. */ |
| |
| /* Fake hostname for ut_host specified on command line. */ |
| static char *fakehost = NULL; |
| |
| /* ... */ |
| #ifdef DEBUGGING |
| #define debug(s) fprintf(dbf,s); fflush(dbf) |
| #define DEBUGTERM "/dev/ttyp0" |
| FILE *dbf; |
| #else |
| #define debug(s) /* nothing */ |
| #endif |
| |
| |
| /* |
| * output error messages |
| */ |
| static void error(const char *fmt, ...) ATTRIBUTE_NORETURN; |
| static void error(const char *fmt, ...) |
| { |
| va_list va_alist; |
| char buf[256]; |
| |
| #ifdef CONFIG_SYSLOGD |
| va_start(va_alist, fmt); |
| vsnprintf(buf, sizeof(buf), fmt, va_alist); |
| openlog(bb_applet_name, 0, LOG_AUTH); |
| syslog(LOG_ERR, "%s", buf); |
| closelog(); |
| #else |
| int fd; |
| size_t l; |
| |
| snprintf(buf, sizeof(buf), "%s: ", bb_applet_name); |
| l = strlen(buf); |
| va_start(va_alist, fmt); |
| vsnprintf(buf + l, sizeof(buf) - l, fmt, va_alist); |
| l = strlen(buf); |
| /* truncate if need */ |
| if((l + 3) > sizeof(buf)) |
| l = sizeof(buf) - 3; |
| /* add \r\n always */ |
| buf[l++] = '\r'; |
| buf[l++] = '\n'; |
| buf[l] = 0; |
| if ((fd = open("/dev/console", 1)) >= 0) { |
| write(fd, buf, l); |
| close(fd); |
| } |
| #endif |
| |
| va_end(va_alist); |
| |
| (void) sleep((unsigned) 10); /* be kind to init(8) */ |
| exit(1); |
| } |
| |
| |
| |
| /* bcode - convert speed string to speed code; return 0 on failure */ |
| static int bcode(const char *s) |
| { |
| int r; |
| unsigned long value; |
| if (safe_strtoul((char *)s, &value)) { |
| return -1; |
| } |
| if ((r = tty_value_to_baud(value)) > 0) { |
| return r; |
| } |
| return 0; |
| } |
| |
| |
| /* parse_speeds - 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) |
| error("bad speed: %s", cp); |
| if (op->numspeed > MAX_SPEED) |
| error("too many alternate speeds"); |
| } |
| debug("exiting parsespeeds\n"); |
| } |
| |
| |
| /* parse-args - parse command-line arguments */ |
| static void parse_args(int argc, char **argv, struct options *op) |
| { |
| char *ts; |
| |
| op->flags = bb_getopt_ulflags(argc, argv, opt_string, |
| &(op->initstring), &fakehost, &(op->issue), |
| &(op->login), &ts); |
| if(op->flags & F_INITSTRING) { |
| const char *p = op->initstring; |
| char *q; |
| |
| q = op->initstring = xstrdup(op->initstring); |
| /* copy optarg into op->initstring decoding \ddd |
| octal codes into chars */ |
| while (*p) { |
| if (*p == '\\') { |
| p++; |
| *q++ = bb_process_escape_sequence(&p); |
| } else { |
| *q++ = *p++; |
| } |
| } |
| *q = '\0'; |
| } |
| op->flags ^= F_ISSUE; /* revert flag show /etc/issue */ |
| if(op->flags & F_TIMEOUT) { |
| if ((op->timeout = atoi(ts)) <= 0) |
| error("bad timeout value: %s", ts); |
| } |
| debug("after getopt loop\n"); |
| if (argc < optind + 2) /* check parameter count */ |
| bb_show_usage(); |
| |
| /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */ |
| if ('0' <= argv[optind][0] && argv[optind][0] <= '9') { |
| /* a number first, assume it's a speed (BSD style) */ |
| parse_speeds(op, argv[optind++]); /* baud rate(s) */ |
| op->tty = argv[optind]; /* tty name */ |
| } else { |
| op->tty = argv[optind++]; /* tty name */ |
| parse_speeds(op, argv[optind]); /* baud rate(s) */ |
| } |
| |
| optind++; |
| if (argc > optind && argv[optind]) |
| setenv("TERM", argv[optind], 1); |
| |
| debug("exiting parseargs\n"); |
| } |
| |
| /* open_tty - set up tty as standard { input, output, error } */ |
| static void open_tty(char *tty, struct termio *tp, int local) |
| { |
| int chdir_to_root = 0; |
| |
| /* Set up new standard input, unless we are given an already opened port. */ |
| |
| if (strcmp(tty, "-")) { |
| struct stat st; |
| int fd; |
| |
| /* Sanity checks... */ |
| |
| if (chdir("/dev")) |
| error("/dev: chdir() failed: %m"); |
| chdir_to_root = 1; |
| if (stat(tty, &st) < 0) |
| error("/dev/%s: %m", tty); |
| if ((st.st_mode & S_IFMT) != S_IFCHR) |
| error("/dev/%s: not a character device", tty); |
| |
| /* Open the tty as standard input. */ |
| |
| close(0); |
| debug("open(2)\n"); |
| fd = open(tty, O_RDWR | O_NONBLOCK, 0); |
| if (fd != 0) |
| error("/dev/%s: cannot open as standard input: %m", tty); |
| } else { |
| |
| /* |
| * Standard input should already be connected to an open port. Make |
| * sure it is open for read/write. |
| */ |
| |
| if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR) |
| error("%s: not open for read/write", tty); |
| } |
| |
| /* Replace current standard output/error fd's with new ones */ |
| debug("duping\n"); |
| if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1 || |
| dup2(STDIN_FILENO, STDERR_FILENO) == -1) |
| error("%s: dup problem: %m", tty); /* we have a problem */ |
| |
| /* |
| * 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. |
| */ |
| |
| if (ioctl(0, TCGETA, tp) < 0) |
| error("%s: ioctl: %m", tty); |
| |
| /* |
| * It seems to be a terminal. Set proper protections and ownership. Mode |
| * 0622 is suitable for SYSV <4 because /bin/login does not change |
| * protections. SunOS 4 login will change the protections to 0620 (write |
| * access for group tty) after the login has succeeded. |
| */ |
| |
| #ifdef DEBIAN |
| { |
| /* tty to root.dialout 660 */ |
| struct group *gr; |
| int id; |
| |
| id = (gr = getgrnam("dialout")) ? gr->gr_gid : 0; |
| chown(tty, 0, id); |
| chmod(tty, 0660); |
| |
| /* vcs,vcsa to root.sys 600 */ |
| if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) { |
| char *vcs, *vcsa; |
| |
| if (!(vcs = strdup(tty))) |
| error("Can't malloc for vcs"); |
| if (!(vcsa = malloc(strlen(tty) + 2))) |
| error("Can't malloc for vcsa"); |
| strcpy(vcs, "vcs"); |
| strcpy(vcs + 3, tty + 3); |
| strcpy(vcsa, "vcsa"); |
| strcpy(vcsa + 4, tty + 3); |
| |
| id = (gr = getgrnam("sys")) ? gr->gr_gid : 0; |
| chown(vcs, 0, id); |
| chmod(vcs, 0600); |
| chown(vcsa, 0, id); |
| chmod(vcs, 0600); |
| |
| free(vcs); |
| free(vcsa); |
| } |
| } |
| #else |
| (void) chown(tty, 0, 0); /* root, sys */ |
| (void) chmod(tty, 0622); /* crw--w--w- */ |
| #endif |
| if(chdir_to_root && chdir("/")) |
| error("chdir to / failed: %m"); |
| } |
| |
| /* termio_init - initialize termio settings */ |
| static void termio_init(struct termio *tp, int speed, struct options *op) |
| { |
| /* |
| * Initial termio 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 |
| * lateron. |
| */ |
| #ifdef __linux__ |
| /* flush input and output queues, important for modems! */ |
| (void) ioctl(0, TCFLSH, TCIOFLUSH); |
| #endif |
| |
| tp->c_cflag = CS8 | HUPCL | CREAD | speed; |
| if (op->flags & F_LOCAL) { |
| tp->c_cflag |= CLOCAL; |
| } |
| |
| tp->c_iflag = tp->c_lflag = tp->c_oflag = tp->c_line = 0; |
| tp->c_cc[VMIN] = 1; |
| tp->c_cc[VTIME] = 0; |
| |
| /* Optionally enable hardware flow control */ |
| |
| #ifdef CRTSCTS |
| if (op->flags & F_RTSCTS) |
| tp->c_cflag |= CRTSCTS; |
| #endif |
| |
| (void) ioctl(0, TCSETA, tp); |
| |
| /* go to blocking input even in local mode */ |
| fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK); |
| |
| debug("term_io 2\n"); |
| } |
| |
| /* auto_baud - extract baud rate from modem status message */ |
| static void auto_baud(struct termio *tp) |
| { |
| int speed; |
| int vmin; |
| unsigned iflag; |
| char buf[BUFSIZ]; |
| char *bp; |
| int nread; |
| |
| /* |
| * This works only if the modem produces its status code AFTER raising |
| * the DCD line, and if the computer is fast enough to set the proper |
| * baud rate before the message has gone by. We expect a message of the |
| * following format: |
| * |
| * <junk><number><junk> |
| * |
| * The number is interpreted as the baud rate of the incoming call. If the |
| * modem does not tell us the baud rate within one second, we will keep |
| * using the current baud rate. It is advisable to enable BREAK |
| * processing (comma-separated list of baud rates) if the processing of |
| * modem status messages is enabled. |
| */ |
| |
| /* |
| * Use 7-bit characters, don't block if input queue is empty. Errors will |
| * be dealt with lateron. |
| */ |
| |
| iflag = tp->c_iflag; |
| tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */ |
| vmin = tp->c_cc[VMIN]; |
| tp->c_cc[VMIN] = 0; /* don't block if queue empty */ |
| (void) ioctl(0, TCSETA, tp); |
| |
| /* |
| * Wait for a while, then read everything the modem has said so far and |
| * try to extract the speed of the dial-in call. |
| */ |
| |
| (void) sleep(1); |
| if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) { |
| buf[nread] = '\0'; |
| for (bp = buf; bp < buf + nread; bp++) { |
| if (isascii(*bp) && isdigit(*bp)) { |
| if ((speed = bcode(bp))) { |
| tp->c_cflag &= ~CBAUD; |
| tp->c_cflag |= speed; |
| } |
| break; |
| } |
| } |
| } |
| /* Restore terminal settings. Errors will be dealt with lateron. */ |
| |
| tp->c_iflag = iflag; |
| tp->c_cc[VMIN] = vmin; |
| (void) ioctl(0, TCSETA, tp); |
| } |
| |
| /* next_speed - select next baud rate */ |
| static void next_speed(struct termio *tp, struct options *op) |
| { |
| static int baud_index = FIRST_SPEED; /* current speed index */ |
| |
| baud_index = (baud_index + 1) % op->numspeed; |
| tp->c_cflag &= ~CBAUD; |
| tp->c_cflag |= op->speeds[baud_index]; |
| (void) ioctl(0, TCSETA, tp); |
| } |
| |
| |
| /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */ |
| static void do_prompt(struct options *op, struct termio *tp) |
| { |
| #ifdef ISSUE /* optional: show /etc/issue */ |
| print_login_issue(op->issue, op->tty); |
| #endif |
| print_login_prompt(); |
| } |
| |
| /* caps_lock - string contains upper case without lower case */ |
| /* returns 1 if true, 0 if false */ |
| static int caps_lock(const char *s) |
| { |
| int capslock; |
| |
| for (capslock = 0; *s; s++) { |
| if (islower(*s)) |
| return (0); |
| if (capslock == 0) |
| capslock = isupper(*s); |
| } |
| return (capslock); |
| } |
| |
| #define logname bb_common_bufsiz1 |
| /* get_logname - get user name, establish parity, speed, erase, kill, eol */ |
| /* return NULL on failure, logname on success */ |
| static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp) |
| { |
| char *bp; |
| char c; /* input character, full eight bits */ |
| char ascval; /* low 7 bits of input character */ |
| int bits; /* # of "1" bits per character */ |
| int mask; /* mask with 1 bit up */ |
| static char *erase[] = { /* backspace-space-backspace */ |
| "\010\040\010", /* space parity */ |
| "\010\040\010", /* odd parity */ |
| "\210\240\210", /* even parity */ |
| "\210\240\210", /* no parity */ |
| }; |
| |
| /* Initialize kill, erase, parity etc. (also after switching speeds). */ |
| |
| *cp = init_chardata; |
| |
| /* Flush pending input (esp. after parsing or switching the baud rate). */ |
| |
| (void) sleep(1); |
| (void) ioctl(0, TCFLSH, TCIFLUSH); |
| |
| /* Prompt for and read a login name. */ |
| |
| for (*logname = 0; *logname == 0; /* void */ ) { |
| |
| /* Write issue file and prompt, with "parity" bit == 0. */ |
| |
| do_prompt(op, tp); |
| |
| /* Read name, watch for break, parity, erase, kill, end-of-line. */ |
| |
| for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) { |
| |
| /* Do not report trivial EINTR/EIO errors. */ |
| |
| if (read(0, &c, 1) < 1) { |
| if (errno == EINTR || errno == EIO) |
| exit(0); |
| error("%s: read: %m", op->tty); |
| } |
| /* Do BREAK handling elsewhere. */ |
| |
| if ((c == 0) && op->numspeed > 1) |
| /* return (0); */ |
| return NULL; |
| |
| /* Do parity bit handling. */ |
| |
| if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */ |
| for (bits = 1, mask = 1; mask & 0177; mask <<= 1) |
| if (mask & ascval) |
| bits++; /* count "1" bits */ |
| cp->parity |= ((bits & 1) ? 1 : 2); |
| } |
| /* Do erase, kill and end-of-line processing. */ |
| |
| switch (ascval) { |
| case CR: |
| case NL: |
| *bp = 0; /* terminate logname */ |
| cp->eol = ascval; /* set end-of-line char */ |
| break; |
| case BS: |
| case DEL: |
| case '#': |
| cp->erase = ascval; /* set erase character */ |
| if (bp > logname) { |
| (void) write(1, erase[cp->parity], 3); |
| bp--; |
| } |
| break; |
| case CTL('U'): |
| case '@': |
| cp->kill = ascval; /* set kill character */ |
| while (bp > logname) { |
| (void) write(1, erase[cp->parity], 3); |
| bp--; |
| } |
| break; |
| case CTL('D'): |
| exit(0); |
| default: |
| if (!isascii(ascval) || !isprint(ascval)) { |
| /* ignore garbage characters */ ; |
| } else if (bp - logname >= sizeof(logname) - 1) { |
| error("%s: input overrun", op->tty); |
| } else { |
| (void) write(1, &c, 1); /* echo the character */ |
| *bp++ = ascval; /* and store it */ |
| } |
| break; |
| } |
| } |
| } |
| /* Handle names with upper case and no lower case. */ |
| |
| if ((cp->capslock = caps_lock(logname))) { |
| for (bp = logname; *bp; bp++) |
| if (isupper(*bp)) |
| *bp = tolower(*bp); /* map name to lower case */ |
| } |
| return (logname); |
| } |
| |
| /* termio_final - set the final tty mode bits */ |
| static void termio_final(struct options *op, struct termio *tp, struct chardata *cp) |
| { |
| /* General terminal-independent stuff. */ |
| |
| tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */ |
| tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE; |
| /* no longer| ECHOCTL | ECHOPRT */ |
| tp->c_oflag |= OPOST; |
| /* tp->c_cflag = 0; */ |
| tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */ |
| tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */ |
| tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */ |
| tp->c_cc[VEOL] = DEF_EOL; |
| tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */ |
| |
| /* Account for special characters seen in input. */ |
| |
| if (cp->eol == CR) { |
| tp->c_iflag |= ICRNL; /* map CR in input to NL */ |
| tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */ |
| } |
| tp->c_cc[VERASE] = cp->erase; /* set erase character */ |
| tp->c_cc[VKILL] = cp->kill; /* set kill character */ |
| |
| /* Account for the presence or absence of parity bits in input. */ |
| |
| switch (cp->parity) { |
| case 0: /* space (always 0) parity */ |
| break; |
| case 1: /* odd parity */ |
| tp->c_cflag |= PARODD; |
| /* FALLTHROUGH */ |
| case 2: /* even parity */ |
| tp->c_cflag |= PARENB; |
| tp->c_iflag |= INPCK | ISTRIP; |
| /* FALLTHROUGH */ |
| case (1 | 2): /* no parity bit */ |
| tp->c_cflag &= ~CSIZE; |
| tp->c_cflag |= CS7; |
| break; |
| } |
| /* Account for upper case without lower case. */ |
| |
| if (cp->capslock) { |
| tp->c_iflag |= IUCLC; |
| tp->c_lflag |= XCASE; |
| tp->c_oflag |= OLCUC; |
| } |
| /* Optionally enable hardware flow control */ |
| |
| #ifdef CRTSCTS |
| if (op->flags & F_RTSCTS) |
| tp->c_cflag |= CRTSCTS; |
| #endif |
| |
| /* Finally, make the new settings effective */ |
| |
| if (ioctl(0, TCSETA, tp) < 0) |
| error("%s: ioctl: TCSETA: %m", op->tty); |
| } |
| |
| |
| #ifdef SYSV_STYLE |
| #ifdef CONFIG_FEATURE_UTMP |
| /* update_utmp - update our utmp entry */ |
| static void update_utmp(char *line) |
| { |
| struct utmp ut; |
| struct utmp *utp; |
| time_t t; |
| int mypid = getpid(); |
| #if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)) |
| struct flock lock; |
| #endif |
| |
| /* |
| * 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. |
| */ |
| if (access(_PATH_UTMP, R_OK|W_OK) == -1) { |
| close(creat(_PATH_UTMP, 0664)); |
| } |
| utmpname(_PATH_UTMP); |
| setutent(); |
| while ((utp = getutent()) |
| && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */ |
| ; |
| |
| if (utp) { |
| memcpy(&ut, utp, sizeof(ut)); |
| } else { |
| /* some inits don't initialize utmp... */ |
| memset(&ut, 0, sizeof(ut)); |
| safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); |
| } |
| /*endutent(); */ |
| |
| strcpy(ut.ut_user, "LOGIN"); |
| safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line)); |
| if (fakehost) |
| safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host)); |
| time(&t); |
| ut.ut_time = t; |
| ut.ut_type = LOGIN_PROCESS; |
| ut.ut_pid = mypid; |
| |
| pututline(&ut); |
| endutent(); |
| |
| #ifdef CONFIG_FEATURE_WTMP |
| if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) |
| close(creat(bb_path_wtmp_file, 0664)); |
| updwtmp(bb_path_wtmp_file, &ut); |
| #endif |
| } |
| |
| #endif /* CONFIG_FEATURE_UTMP */ |
| #endif /* SYSV_STYLE */ |
| |
| |
| #undef logname |
| int getty_main(int argc, char **argv) |
| { |
| char *logname = NULL; /* login name, given to /bin/login */ |
| struct chardata chardata; /* set by get_logname() */ |
| struct termio termio; /* terminal mode bits */ |
| static struct options options = { |
| 0, /* show /etc/issue (SYSV_STYLE) */ |
| 0, /* no timeout */ |
| _PATH_LOGIN, /* default login program */ |
| "tty1", /* default tty line */ |
| "", /* modem init string */ |
| #ifdef ISSUE |
| ISSUE, /* default issue file */ |
| #else |
| NULL, |
| #endif |
| 0, /* no baud rates known yet */ |
| }; |
| |
| #ifdef DEBUGGING |
| dbf = xfopen(DEBUGTERM, "w"); |
| |
| { |
| int i; |
| |
| for (i = 1; i < argc; i++) { |
| debug(argv[i]); |
| debug("\n"); |
| } |
| } |
| #endif |
| |
| /* Parse command-line arguments. */ |
| |
| parse_args(argc, argv, &options); |
| |
| #ifdef __linux__ |
| setsid(); |
| #endif |
| |
| /* Update the utmp file. */ |
| |
| |
| #ifdef SYSV_STYLE |
| #ifdef CONFIG_FEATURE_UTMP |
| update_utmp(options.tty); |
| #endif |
| #endif |
| |
| debug("calling open_tty\n"); |
| /* Open the tty as standard { input, output, error }. */ |
| open_tty(options.tty, &termio, options.flags & F_LOCAL); |
| |
| #ifdef __linux__ |
| { |
| int iv; |
| |
| iv = getpid(); |
| ioctl(0, TIOCSPGRP, &iv); |
| } |
| #endif |
| /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */ |
| debug("calling termio_init\n"); |
| termio_init(&termio, options.speeds[FIRST_SPEED], &options); |
| |
| /* write the modem init string and DON'T flush the buffers */ |
| if (options.flags & F_INITSTRING) { |
| debug("writing init string\n"); |
| write(1, options.initstring, strlen(options.initstring)); |
| } |
| |
| if (!(options.flags & F_LOCAL)) { |
| /* go to blocking write mode unless -L is specified */ |
| fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK); |
| } |
| |
| /* Optionally detect the baud rate from the modem status message. */ |
| debug("before autobaud\n"); |
| if (options.flags & F_PARSE) |
| auto_baud(&termio); |
| |
| /* Set the optional timer. */ |
| if (options.timeout) |
| (void) alarm((unsigned) options.timeout); |
| |
| /* optionally wait for CR or LF before writing /etc/issue */ |
| if (options.flags & F_WAITCRLF) { |
| char ch; |
| |
| debug("waiting for cr-lf\n"); |
| while (read(0, &ch, 1) == 1) { |
| ch &= 0x7f; /* strip "parity bit" */ |
| #ifdef DEBUGGING |
| fprintf(dbf, "read %c\n", ch); |
| #endif |
| if (ch == '\n' || ch == '\r') |
| break; |
| } |
| } |
| |
| chardata = init_chardata; |
| if (!(options.flags & F_NOPROMPT)) { |
| /* Read the login name. */ |
| debug("reading login name\n"); |
| /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */ |
| while ((logname = get_logname(&options, &chardata, &termio)) == |
| NULL) next_speed(&termio, &options); |
| } |
| |
| /* Disable timer. */ |
| |
| if (options.timeout) |
| (void) alarm(0); |
| |
| /* Finalize the termio settings. */ |
| |
| termio_final(&options, &termio, &chardata); |
| |
| /* Now the newline character should be properly written. */ |
| |
| (void) write(1, "\n", 1); |
| |
| /* Let the login program take care of password validation. */ |
| |
| (void) execl(options.login, options.login, "--", logname, (char *) 0); |
| error("%s: can't exec %s: %m", options.tty, options.login); |
| } |
| |