*
* option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
*
- * 1999-02-22 Arkadiusz MiΒΆkiewicz <misiek@misiek.eu.org>
+ * 1999-02-22 Arkadiusz Mickiewicz <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.
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include <syslog.h>
#if ENABLE_FEATURE_UTMP
-#include <utmp.h>
+# include <utmp.h> /* LOGIN_PROCESS */
+#endif
+
+#ifndef IUCLC
+# define IUCLC 0
#endif
/*
*/
#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
#include <sys/utsname.h>
-#include <time.h>
-#if ENABLE_FEATURE_WTMP
-extern void updwtmp(const char *filename, const struct utmp *ut);
-#endif
#else /* if !sysV style, wtmp/utmp code is off */
#undef ENABLE_FEATURE_UTMP
#undef ENABLE_FEATURE_WTMP
#define ISSUE "/etc/issue" /* displayed before the login prompt */
/* Some shorthands for control characters. */
-#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
+#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 */
unsigned char kill; /* kill character */
unsigned char eol; /* end-of-line character */
unsigned char parity; /* what parity did we see */
+ /* (parity & 1): saw odd parity char with 7th bit set */
+ /* (parity & 2): saw even parity char with 7th bit set */
+ /* parity == 0: probably 7-bit, space parity? */
+ /* parity == 1: probably 7-bit, odd parity? */
+ /* parity == 2: probably 7-bit, even parity? */
+ /* parity == 3: definitely 8 bit, no parity! */
+ /* Hmm... with any value of "parity" 8 bit, no parity is possible */
#ifdef HANDLE_ALLCAPS
unsigned char capslock; /* upper case without lower case */
#endif
/* The following is used for understandable diagnostics. */
#ifdef DEBUGGING
-#define debug(s) fprintf(dbf,s); fflush(dbf)
-#define DEBUGTERM "/dev/ttyp0"
static FILE *dbf;
+#define DEBUGTERM "/dev/ttyp0"
+#define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0)
#else
-#define debug(s) /* nothing */
+#define debug(...) ((void)0)
#endif
-/* bcode - convert speed string to speed code; return 0 on failure */
+/* bcode - convert speed string to speed code; return <= 0 on failure */
static int bcode(const char *s)
{
- int r;
- unsigned value = bb_strtou(s, NULL, 10);
- if (errno) {
- return -1;
- }
- r = tty_value_to_baud(value);
- if (r > 0) {
- return r;
- }
- return 0;
+ int value = bb_strtou(s, NULL, 10); /* yes, int is intended! */
+ if (value < 0) /* bad terminating char, overflow, etc */
+ return value;
+ return tty_value_to_baud(value);
}
/* parse_speeds - parse alternate baud rates */
debug("entered parse_speeds\n");
while ((cp = strsep(&arg, ",")) != NULL) {
op->speeds[op->numspeed] = bcode(cp);
- if (op->speeds[op->numspeed] <= 0)
+ if (op->speeds[op->numspeed] < 0)
bb_error_msg_and_die("bad speed: %s", cp);
+ /* note: arg "0" turns into speed B0 */
op->numspeed++;
if (op->numspeed > MAX_SPEED)
bb_error_msg_and_die("too many alternate speeds");
{
char *ts;
- opt_complementary = "-2"; /* at least 2 args */
+ opt_complementary = "-2:t+"; /* at least 2 args; -t N */
op->flags = getopt32(argv, opt_string,
&(op->initstring), fakehost_p, &(op->issue),
- &(op->login), &ts);
+ &(op->login), &op->timeout);
argv += optind;
if (op->flags & F_INITSTRING) {
const char *p = op->initstring;
}
*q = '\0';
}
- op->flags ^= F_ISSUE; /* invert flag show /etc/issue */
- if (op->flags & F_TIMEOUT) {
- op->timeout = xatoi_u(ts);
- }
+ op->flags ^= F_ISSUE; /* invert flag "show /etc/issue" */
debug("after getopt\n");
/* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
ts = argv[0]; /* baud rate(s) */
}
parse_speeds(op, ts);
+ applet_name = xasprintf("getty: %s", op->tty);
if (argv[2])
- setenv("TERM", argv[2], 1);
+ xsetenv("TERM", argv[2]);
debug("exiting parse_args\n");
}
{
/* Set up new standard input, unless we are given an already opened port. */
if (NOT_LONE_DASH(tty)) {
- struct stat st;
- int cur_dir_fd;
- int fd;
+// struct stat st;
+// int cur_dir_fd;
+// int fd;
/* Sanity checks... */
- cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
- xchdir("/dev");
- xstat(tty, &st);
- if ((st.st_mode & S_IFMT) != S_IFCHR)
- bb_error_msg_and_die("%s: not a character device", tty);
+// cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
+// xchdir("/dev");
+// xstat(tty, &st);
+// if (!S_ISCHR(st.st_mode))
+// bb_error_msg_and_die("not a character device");
+
+ if (tty[0] != '/')
+ tty = xasprintf("/dev/%s", tty); /* will leak it */
/* Open the tty as standard input. */
debug("open(2)\n");
- fd = xopen(tty, O_RDWR | O_NONBLOCK);
+ close(0);
+ /*fd =*/ xopen(tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */
- /* Restore current directory */
- fchdir(cur_dir_fd);
+// /* Restore current directory */
+// fchdir(cur_dir_fd);
/* Open the tty as standard input, continued */
- xdup2(fd, 0);
- /* fd is >= cur_dir_fd, and cur_dir_fd gets closed too here: */
- while (fd > 2)
- close(fd--);
-
- /* 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.
- */
+// xmove_fd(fd, 0);
+// /* fd is >= cur_dir_fd, and cur_dir_fd gets closed too here: */
+// while (fd > 2)
+// close(fd--);
+
+ /* Set proper protections and ownership. */
fchown(0, 0, 0); /* 0:0 */
- fchmod(0, 0622); /* crw--w--w- */
+ fchmod(0, 0620); /* crw--w---- */
} else {
/*
* Standard input should already be connected to an open port. Make
/* termios_init - initialize termios settings */
static void termios_init(struct termios *tp, int speed, struct options *op)
{
+ speed_t ispeed, ospeed;
/*
* Initial termios 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
* later on.
*/
-#ifdef __linux__
/* flush input and output queues, important for modems! */
- ioctl(0, TCFLSH, TCIOFLUSH);
-#endif
-
- tp->c_cflag = CS8 | HUPCL | CREAD | speed;
- if (op->flags & F_LOCAL) {
- tp->c_cflag |= CLOCAL;
+ tcflush(0, TCIOFLUSH);
+ ispeed = ospeed = speed;
+ if (speed == B0) {
+ /* Speed was specified as "0" on command line.
+ * Just leave it unchanged */
+ ispeed = cfgetispeed(tp);
+ ospeed = cfgetospeed(tp);
}
+ tp->c_cflag = CS8 | HUPCL | CREAD;
+ if (op->flags & F_LOCAL)
+ tp->c_cflag |= CLOCAL;
+ cfsetispeed(tp, ispeed);
+ cfsetospeed(tp, ospeed);
- tp->c_iflag = tp->c_lflag = tp->c_line = 0;
+ tp->c_iflag = tp->c_lflag = 0;
tp->c_oflag = OPOST | ONLCR;
tp->c_cc[VMIN] = 1;
tp->c_cc[VTIME] = 0;
+#ifdef __linux__
+ tp->c_line = 0;
+#endif
/* Optionally enable hardware flow control */
#ifdef CRTSCTS
tp->c_cflag |= CRTSCTS;
#endif
- ioctl(0, TCSETS, tp);
+ tcsetattr_stdin_TCSANOW(tp);
debug("term_io 2\n");
}
tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
vmin = tp->c_cc[VMIN];
tp->c_cc[VMIN] = 0; /* don't block if queue empty */
- ioctl(0, TCSETS, tp);
+ tcsetattr_stdin_TCSANOW(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.
*/
sleep(1);
- nread = safe_read(0, buf, size_buf - 1);
+ nread = safe_read(STDIN_FILENO, buf, size_buf - 1);
if (nread > 0) {
buf[nread] = '\0';
for (bp = buf; bp < buf + nread; bp++) {
if (isdigit(*bp)) {
speed = bcode(bp);
- if (speed > 0) {
- tp->c_cflag &= ~CBAUD;
- tp->c_cflag |= speed;
- }
+ if (speed > 0)
+ cfsetspeed(tp, speed);
break;
}
}
/* Restore terminal settings. Errors will be dealt with later on. */
tp->c_iflag = iflag;
tp->c_cc[VMIN] = vmin;
- ioctl(0, TCSETS, tp);
+ tcsetattr_stdin_TCSANOW(tp);
}
/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
-static void do_prompt(struct options *op, struct termios *tp)
+static void do_prompt(struct options *op)
{
#ifdef ISSUE
print_login_issue(op->issue, op->tty);
/* get_logname - get user name, establish parity, speed, erase, kill, eol;
* return NULL on BREAK, logname on success */
static char *get_logname(char *logname, unsigned size_logname,
- struct options *op, struct chardata *cp, struct termios *tp)
+ struct options *op, struct chardata *cp)
{
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 const char erase[][3] = { /* backspace-space-backspace */
+ static const char erase[][3] = {/* backspace-space-backspace */
"\010\040\010", /* space parity */
"\010\040\010", /* odd parity */
"\210\240\210", /* even parity */
- "\210\240\210", /* no parity */
+ "\010\040\010", /* 8 bit no parity */
};
/* NB: *cp is pre-initialized with init_chardata */
/* Flush pending input (esp. after parsing or switching the baud rate). */
sleep(1);
- ioctl(0, TCFLSH, TCIFLUSH);
+ tcflush(0, TCIOFLUSH);
/* Prompt for and read a login name. */
logname[0] = '\0';
while (!logname[0]) {
/* Write issue file and prompt, with "parity" bit == 0. */
- do_prompt(op, tp);
+ do_prompt(op);
/* Read name, watch for break, parity, erase, kill, end-of-line. */
bp = logname;
while (cp->eol == '\0') {
/* Do not report trivial EINTR/EIO errors. */
- if (read(0, &c, 1) < 1) {
+ errno = EINTR; /* make read of 0 bytes be silent too */
+ if (read(STDIN_FILENO, &c, 1) < 1) {
if (errno == EINTR || errno == EIO)
- exit(0);
- bb_perror_msg_and_die("%s: read", op->tty);
+ exit(EXIT_SUCCESS);
+ bb_perror_msg_and_die(bb_msg_read_error);
}
/* BREAK. If we have speeds to try,
return NULL;
/* Do parity bit handling. */
- ascval = c & 0177;
- if (c != ascval) { /* "parity" bit on ? */
+ if (!(op->flags & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */
bits = 1;
mask = 1;
- while (mask & 0177) {
- if (mask & ascval)
+ while (mask & 0x7f) {
+ if (mask & c)
bits++; /* count "1" bits */
mask <<= 1;
}
}
/* Do erase, kill and end-of-line processing. */
+ ascval = c & 0x7f;
switch (ascval) {
case CR:
case NL:
#endif
cp->erase = ascval; /* set erase character */
if (bp > logname) {
- full_write(1, erase[cp->parity], 3);
+ full_write(STDOUT_FILENO, erase[cp->parity], 3);
bp--;
}
break;
#endif
cp->kill = ascval; /* set kill character */
while (bp > logname) {
- full_write(1, erase[cp->parity], 3);
+ full_write(STDOUT_FILENO, erase[cp->parity], 3);
bp--;
}
break;
case CTL('D'):
- exit(0);
+ exit(EXIT_SUCCESS);
default:
- if (!isascii(ascval) || !isprint(ascval)) {
+ if (ascval < ' ') {
/* ignore garbage characters */
- } else if (bp - logname >= size_logname - 1) {
- bb_error_msg_and_die("%s: input overrun", op->tty);
+ } else if ((int)(bp - logname) >= size_logname - 1) {
+ bb_error_msg_and_die("input overrun");
} else {
- full_write(1, &c, 1); /* echo the character */
+ full_write(STDOUT_FILENO, &c, 1); /* echo the character */
*bp++ = ascval; /* and store it */
}
break;
static void termios_final(struct options *op, struct termios *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_cc[VQUIT] = DEF_QUIT; /* default quit */
tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
tp->c_cc[VEOL] = DEF_EOL;
+#ifdef VSWTC
tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
+#endif
/* 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[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 */
+// I bet most people go here - they use only 7-bit chars in usernames....
break;
case 1: /* odd parity */
tp->c_cflag |= PARODD;
case (1 | 2): /* no parity bit */
tp->c_cflag &= ~CSIZE;
tp->c_cflag |= CS7;
+// FIXME: wtf? case 3: we saw both even and odd 8-bit bytes -
+// it's probably some umlauts etc, but definitely NOT 7-bit!!!
+// Entire parity detection madness here just begs for deletion...
break;
}
}
#endif
/* Optionally enable hardware flow control */
-
-#ifdef CRTSCTS
+#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
/* Finally, make the new settings effective */
-
- ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
-}
-
-#if ENABLE_FEATURE_UTMP
-static void touch(const char *filename)
-{
- if (access(filename, R_OK | W_OK) == -1)
- close(open(filename, O_WRONLY | O_CREAT, 0664));
-}
-
-/* update_utmp - update our utmp entry */
-static void update_utmp(const char *line, char *fakehost)
-{
- struct utmp ut;
- struct utmp *utp;
- int mypid = getpid();
-
- /* In case we won't find an entry below... */
- memset(&ut, 0, sizeof(ut));
- safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
-
- /*
- * 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.
- */
- touch(_PATH_UTMP);
-
- utmpname(_PATH_UTMP);
- setutent();
- while ((utp = getutent()) != NULL) {
- if (utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid) {
- memcpy(&ut, utp, sizeof(ut));
- break;
- }
- }
-
- 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));
- ut.ut_time = time(NULL);
- ut.ut_type = LOGIN_PROCESS;
- ut.ut_pid = mypid;
-
- pututline(&ut);
- endutent();
-
-#if ENABLE_FEATURE_WTMP
- touch(bb_path_wtmp_file);
- updwtmp(bb_path_wtmp_file, &ut);
-#endif
+ if (tcsetattr_stdin_TCSANOW(tp) < 0)
+ bb_perror_msg_and_die("tcsetattr");
}
-#endif /* CONFIG_FEATURE_UTMP */
int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int getty_main(int argc, char **argv)
+int getty_main(int argc UNUSED_PARAM, char **argv)
{
int n;
+ pid_t pid;
char *fakehost = NULL; /* Fake hostname for ut_host */
char *logname; /* login name, given to /bin/login */
/* Merging these into "struct local" may _seem_ to reduce
struct termios termios; /* terminal mode bits */
struct options options;
+ chardata = init_chardata;
+
memset(&options, 0, sizeof(options));
options.login = _PATH_LOGIN; /* default login program */
options.tty = "tty1"; /* default tty line */
options.issue = ISSUE; /* default issue file */
#endif
- /* Already too late because of theoretical
- * possibility of getty --help somehow triggered
- * inadvertently before we reach this. Oh well. */
+ /* Parse command-line arguments. */
+ parse_args(argv, &options, &fakehost);
+
logmode = LOGMODE_NONE;
/* Create new session, lose controlling tty, if any */
* "This is allowed only when the current process
* is not a process group leader" - is this a problem? */
setsid();
-
+ /* close stdio, and stray descriptors, just in case */
n = xopen(bb_dev_null, O_RDWR);
- /* dup2(n, 0); - no, because of possible "getty - 9600" */
- dup2(n, 1);
- dup2(n, 2);
+ /* dup2(n, 0); - no, we need to handle "getty - 9600" too */
+ xdup2(n, 1);
+ xdup2(n, 2);
while (n > 2)
close(n--);
- /* We want special flavor of error_msg_and_die */
+
+ /* Logging. We want special flavor of error_msg_and_die */
die_sleep = 10;
msg_eol = "\r\n";
+ /* most likely will internally use fd #3 in CLOEXEC mode: */
openlog(applet_name, LOG_PID, LOG_AUTH);
logmode = LOGMODE_BOTH;
#ifdef DEBUGGING
- dbf = xfopen(DEBUGTERM, "w");
- for (n = 1; n < argc; n++) {
+ dbf = xfopen_for_write(DEBUGTERM);
+ for (n = 1; argv[n]; n++) {
debug(argv[n]);
debug("\n");
}
#endif
- /* Parse command-line arguments. */
- parse_args(argv, &options, &fakehost);
-
- debug("calling open_tty\n");
/* Open the tty as standard input, if it is not "-" */
+ /* If it's not "-" and not taken yet, it will become our ctty */
+ debug("calling open_tty\n");
open_tty(options.tty);
-
- debug("duping\n");
ndelay_off(0);
+ debug("duping\n");
xdup2(0, 1);
xdup2(0, 2);
* by patching the SunOS kernel variable "zsadtrlow" to a larger value;
* 5 seconds seems to be a good value.
*/
- ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty);
-
-#if ENABLE_FEATURE_UTMP
- /* Update the utmp file */
- update_utmp(options.tty, fakehost);
-#endif
+ if (tcgetattr(0, &termios) < 0)
+ bb_perror_msg_and_die("tcgetattr");
+ pid = getpid();
#ifdef __linux__
- /* Make ourself a foreground process group within our session */
- tcsetpgrp(0, getpid());
+// FIXME: do we need this? Otherwise "-" case seems to be broken...
// /* Forcibly make fd 0 our controlling tty, even if another session
// * has it as a ctty. (Another session loses ctty). */
// ioctl(0, TIOCSCTTY, (void*)1);
+ /* Make ourself a foreground process group within our session */
+ tcsetpgrp(0, pid);
#endif
+ /* Update the utmp file. This tty is ours now! */
+ update_utmp(pid, LOGIN_PROCESS, options.tty, "LOGIN", fakehost);
+
/* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
debug("calling termios_init\n");
termios_init(&termios, options.speeds[0], &options);
/* Write the modem init string and DON'T flush the buffers */
if (options.flags & F_INITSTRING) {
debug("writing init string\n");
- full_write(1, options.initstring, strlen(options.initstring));
+ full_write1_str(options.initstring);
}
/* Optionally detect the baud rate from the modem status message */
auto_baud(line_buf, sizeof(line_buf), &termios);
/* Set the optional timer */
- if (options.timeout)
- alarm(options.timeout);
+ alarm(options.timeout); /* if 0, alarm is not set */
/* Optionally wait for CR or LF before writing /etc/issue */
if (options.flags & F_WAITCRLF) {
char ch;
debug("waiting for cr-lf\n");
- while (safe_read(0, &ch, 1) == 1) {
+ while (safe_read(STDIN_FILENO, &ch, 1) == 1) {
+ debug("read %x\n", (unsigned char)ch);
ch &= 0x7f; /* strip "parity bit" */
-#ifdef DEBUGGING
- fprintf(dbf, "read %c\n", ch);
-#endif
if (ch == '\n' || ch == '\r')
break;
}
}
logname = NULL;
- chardata = init_chardata;
if (!(options.flags & F_NOPROMPT)) {
/* NB:termios_init already set line speed
* to options.speeds[0] */
/* Read the login name. */
debug("reading login name\n");
logname = get_logname(line_buf, sizeof(line_buf),
- &options, &chardata, &termios);
+ &options, &chardata);
if (logname)
break;
/* we are here only if options.numspeed > 1 */
baud_index = (baud_index + 1) % options.numspeed;
- termios.c_cflag &= ~CBAUD;
- termios.c_cflag |= options.speeds[baud_index];
- ioctl(0, TCSETS, &termios);
+ cfsetispeed(&termios, options.speeds[baud_index]);
+ cfsetospeed(&termios, options.speeds[baud_index]);
+ tcsetattr_stdin_TCSANOW(&termios);
}
}
/* Disable timer. */
- if (options.timeout)
- alarm(0);
+ alarm(0);
/* Finalize the termios settings. */
termios_final(&options, &termios, &chardata);
/* Now the newline character should be properly written. */
- full_write(1, "\n", 1);
+ full_write(STDOUT_FILENO, "\n", 1);
/* Let the login program take care of password validation. */
/* We use PATH because we trust that root doesn't set "bad" PATH,
* and getty is not suid-root applet. */
- /* Hmm... with -n, logname == NULL! Is it ok? */
+ /* With -n, logname == NULL, and login will ask for username instead */
BB_EXECLP(options.login, options.login, "--", logname, NULL);
- bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login);
+ bb_error_msg_and_die("can't execute '%s'", options.login);
}
projects / oweals / busybox.git / blobdiff