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-rw-r--r--loginutils/getty.c392
1 files changed, 165 insertions, 227 deletions
diff --git a/loginutils/getty.c b/loginutils/getty.c
index d32d18935..590a05de8 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -33,7 +33,6 @@
#include <time.h>
#if ENABLE_FEATURE_WTMP
extern void updwtmp(const char *filename, const struct utmp *ut);
-static void update_utmp(const char *line);
#endif
#endif /* LOGIN_PROCESS */
@@ -47,6 +46,7 @@ static void update_utmp(const char *line);
/* I doubt there are systems which still need this */
#undef HANDLE_ALLCAPS
+#undef ANCIENT_BS_KILL_CHARS
#define _PATH_LOGIN "/bin/login"
@@ -76,36 +76,20 @@ static void update_utmp(const char *line);
* 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 */
+/* Storage for command-line options. */
struct options {
int flags; /* toggle switches, see below */
unsigned timeout; /* time-out period */
- const char *login; /* login program */
- const char *tty; /* name of tty */
- const char *initstring; /* modem init string */
- const char *issue; /* alternative issue file */
+ const char *login; /* login program */
+ const char *tty; /* name of tty */
+ const char *initstring; /* modem init string */
+ const 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[] ALIGN1 = "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 {
unsigned char erase; /* erase character */
@@ -117,6 +101,7 @@ struct chardata {
#endif
};
+
/* Initial values for the above. */
static const struct chardata init_chardata = {
DEF_ERASE, /* default erase character */
@@ -128,12 +113,25 @@ static const struct chardata init_chardata = {
#endif
};
-/* The following is used for understandable diagnostics. */
+static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
+#define F_INITSTRING (1 << 0) /* -I initstring is set */
+#define F_LOCAL (1 << 1) /* -L force local */
+#define F_FAKEHOST (1 << 2) /* -H force fakehost */
+#define F_CUSTISSUE (1 << 3) /* -f give alternative issue file */
+#define F_RTSCTS (1 << 4) /* -h enable RTS/CTS flow control */
+#define F_ISSUE (1 << 5) /* -i display /etc/issue */
+#define F_LOGIN (1 << 6) /* -l non-default login program */
+#define F_PARSE (1 << 7) /* -m process modem status messages */
+#define F_TIMEOUT (1 << 8) /* -t time out */
+#define F_WAITCRLF (1 << 9) /* -w wait for CR or LF */
+#define F_NOPROMPT (1 << 10) /* -n don't ask for login name! */
+
/* Fake hostname for ut_host specified on command line. */
static char *fakehost = NULL;
+#define line_buf bb_common_bufsiz1
-/* ... */
+/* The following is used for understandable diagnostics. */
#ifdef DEBUGGING
#define debug(s) fprintf(dbf,s); fflush(dbf)
#define DEBUGTERM "/dev/ttyp0"
@@ -158,14 +156,14 @@ static int bcode(const char *s)
return 0;
}
-
/* parse_speeds - parse alternate baud rates */
static void parse_speeds(struct options *op, char *arg)
{
char *cp;
+ /* NB: at least one iteration is always done */
debug("entered parse_speeds\n");
- for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
+ while ((cp = strsep(&arg, ",")) != NULL) {
op->speeds[op->numspeed] = bcode(cp);
if (op->speeds[op->numspeed] <= 0)
bb_error_msg_and_die("bad speed: %s", cp);
@@ -173,18 +171,19 @@ static void parse_speeds(struct options *op, char *arg)
if (op->numspeed > MAX_SPEED)
bb_error_msg_and_die("too many alternate speeds");
}
- debug("exiting parsespeeds\n");
+ debug("exiting parse_speeds\n");
}
-
/* parse_args - parse command-line arguments */
-static void parse_args(int argc, char **argv, struct options *op)
+static void parse_args(char **argv, struct options *op)
{
char *ts;
+ opt_complementary = "-2"; /* at least 2 args */
op->flags = getopt32(argv, opt_string,
&(op->initstring), &fakehost, &(op->issue),
&(op->login), &ts);
+ argv += optind;
if (op->flags & F_INITSTRING) {
const char *p = op->initstring;
char *q;
@@ -202,45 +201,40 @@ static void parse_args(int argc, char **argv, struct options *op)
}
*q = '\0';
}
- op->flags ^= F_ISSUE; /* revert flag show /etc/issue */
+ op->flags ^= F_ISSUE; /* invert flag show /etc/issue */
if (op->flags & F_TIMEOUT) {
- op->timeout = xatoul_range(ts, 1, INT_MAX);
+ op->timeout = xatoi_u(ts);
}
- argv += optind;
- argc -= optind;
- debug("after getopt loop\n");
- if (argc < 2) /* check parameter count */
- bb_show_usage();
+ debug("after getopt\n");
/* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
+ op->tty = argv[0]; /* tty name */
+ ts = argv[1]; /* baud rate(s) */
if (isdigit(argv[0][0])) {
/* a number first, assume it's a speed (BSD style) */
- parse_speeds(op, argv[0]); /* baud rate(s) */
- op->tty = argv[1]; /* tty name */
- } else {
- op->tty = argv[0]; /* tty name */
- parse_speeds(op, argv[1]); /* baud rate(s) */
+ op->tty = ts; /* tty name is in argv[1] */
+ ts = argv[0]; /* baud rate(s) */
}
+ parse_speeds(op, ts);
if (argv[2])
setenv("TERM", argv[2], 1);
- debug("exiting parseargs\n");
+ debug("exiting parse_args\n");
}
/* open_tty - set up tty as standard { input, output, error } */
-static void open_tty(const char *tty, struct termios *tp, int local)
+static void open_tty(const char *tty)
{
- int chdir_to_root = 0;
-
/* 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;
/* Sanity checks... */
+ cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
xchdir("/dev");
- chdir_to_root = 1;
xstat(tty, &st);
if ((st.st_mode & S_IFMT) != S_IFCHR)
bb_error_msg_and_die("%s: not a character device", tty);
@@ -248,9 +242,23 @@ static void open_tty(const char *tty, struct termios *tp, int local)
/* Open the tty as standard input. */
debug("open(2)\n");
fd = xopen(tty, O_RDWR | O_NONBLOCK);
+
+ /* 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.
+ */
+ fchown(0, 0, 0); /* 0:0 */
+ fchmod(0, 0622); /* crw--w--w- */
} else {
/*
* Standard input should already be connected to an open port. Make
@@ -259,71 +267,6 @@ static void open_tty(const char *tty, struct termios *tp, int local)
if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
bb_error_msg_and_die("stdin is not open for read/write");
}
-
- /* Replace current standard output/error fd's with new ones */
- debug("duping\n");
- xdup2(0, 1);
- xdup2(0, 2);
-
- /*
- * 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.
- */
- ioctl_or_perror_and_die(0, TCGETS, tp, "%s: TCGETS", 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
-#warning Debian /dev/vcs[a]NN hack is deprecated and will be removed
- {
- /* tty to root.dialout 660 */
- struct group *gr;
- int id;
-
- gr = getgrnam("dialout");
- id = gr ? 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;
-
- vcs = xstrdup(tty);
- vcsa = xmalloc(strlen(tty) + 2);
- strcpy(vcs, "vcs");
- strcpy(vcs + 3, tty + 3);
- strcpy(vcsa, "vcsa");
- strcpy(vcsa + 4, tty + 3);
-
- gr = getgrnam("sys");
- id = gr ? gr->gr_gid : 0;
- chown(vcs, 0, id);
- chmod(vcs, 0600);
- chown(vcsa, 0, id);
- chmod(vcs, 0600);
-
- free(vcs);
- free(vcsa);
- }
- }
-#else
- if (NOT_LONE_DASH(tty)) {
- chown(tty, 0, 0); /* 0:0 */
- chmod(tty, 0622); /* crw--w--w- */
- }
-#endif
- if (chdir_to_root)
- xchdir("/");
}
/* termios_init - initialize termios settings */
@@ -351,17 +294,13 @@ static void termios_init(struct termios *tp, int speed, struct options *op)
tp->c_cc[VTIME] = 0;
/* Optionally enable hardware flow control */
-
-#ifdef CRTSCTS
+#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
ioctl(0, TCSETS, tp);
- /* go to blocking input even in local mode */
- ndelay_off(0);
-
debug("term_io 2\n");
}
@@ -393,26 +332,24 @@ static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
* Use 7-bit characters, don't block if input queue is empty. Errors will
* be dealt with later on.
*/
-
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 */
+ tp->c_cc[VMIN] = 0; /* don't block if queue empty */
ioctl(0, TCSETS, 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 = read(0, buf, size_buf - 1);
+ nread = safe_read(0, buf, size_buf - 1);
if (nread > 0) {
buf[nread] = '\0';
for (bp = buf; bp < buf + nread; bp++) {
- if (isascii(*bp) && isdigit(*bp)) {
+ if (isdigit(*bp)) {
speed = bcode(bp);
- if (speed) {
+ if (speed > 0) {
tp->c_cflag &= ~CBAUD;
tp->c_cflag |= speed;
}
@@ -420,25 +357,13 @@ static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
}
}
}
- /* Restore terminal settings. Errors will be dealt with later on. */
+ /* Restore terminal settings. Errors will be dealt with later on. */
tp->c_iflag = iflag;
tp->c_cc[VMIN] = vmin;
ioctl(0, TCSETS, tp);
}
-/* next_speed - select next baud rate */
-static void next_speed(struct termios *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];
- ioctl(0, TCSETS, tp);
-}
-
-
/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
static void do_prompt(struct options *op, struct termios *tp)
{
@@ -449,9 +374,9 @@ static void do_prompt(struct options *op, struct termios *tp)
}
#ifdef HANDLE_ALLCAPS
-/* caps_lock - string contains upper case without lower case */
+/* all_is_upcase - string contains upper case without lower case */
/* returns 1 if true, 0 if false */
-static int caps_lock(const char *s)
+static int all_is_upcase(const char *s)
{
while (*s)
if (islower(*s++))
@@ -460,8 +385,8 @@ static int caps_lock(const char *s)
}
#endif
-/* get_logname - get user name, establish parity, speed, erase, kill, eol */
-/* return NULL on failure, logname on success */
+/* 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)
{
@@ -477,26 +402,19 @@ static char *get_logname(char *logname, unsigned size_logname,
"\210\240\210", /* no parity */
};
- /* Initialize kill, erase, parity etc. (also after switching speeds). */
-
- *cp = init_chardata;
+ /* 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);
/* 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);
/* Read name, watch for break, parity, erase, kill, end-of-line. */
-
bp = logname;
cp->eol = '\0';
while (cp->eol == '\0') {
@@ -508,7 +426,8 @@ static char *get_logname(char *logname, unsigned size_logname,
bb_perror_msg_and_die("%s: read", op->tty);
}
- /* Do BREAK handling elsewhere. */
+ /* BREAK. If we have speeds to try,
+ * return NULL (will switch speeds and return here) */
if (c == '\0' && op->numspeed > 1)
return NULL;
@@ -535,18 +454,22 @@ static char *get_logname(char *logname, unsigned size_logname,
break;
case BS:
case DEL:
+#ifdef ANCIENT_BS_KILL_CHARS
case '#':
+#endif
cp->erase = ascval; /* set erase character */
if (bp > logname) {
- write(1, erase[cp->parity], 3);
+ full_write(1, erase[cp->parity], 3);
bp--;
}
break;
case CTL('U'):
+#ifdef ANCIENT_BS_KILL_CHARS
case '@':
+#endif
cp->kill = ascval; /* set kill character */
while (bp > logname) {
- write(1, erase[cp->parity], 3);
+ full_write(1, erase[cp->parity], 3);
bp--;
}
break;
@@ -558,7 +481,7 @@ static char *get_logname(char *logname, unsigned size_logname,
} else if (bp - logname >= size_logname - 1) {
bb_error_msg_and_die("%s: input overrun", op->tty);
} else {
- write(1, &c, 1); /* echo the character */
+ full_write(1, &c, 1); /* echo the character */
*bp++ = ascval; /* and store it */
}
break;
@@ -568,7 +491,7 @@ static char *get_logname(char *logname, unsigned size_logname,
/* Handle names with upper case and no lower case. */
#ifdef HANDLE_ALLCAPS
- cp->capslock = caps_lock(logname);
+ cp->capslock = all_is_upcase(logname);
if (cp->capslock) {
for (bp = logname; *bp; bp++)
if (isupper(*bp))
@@ -641,7 +564,6 @@ static void termios_final(struct options *op, struct termios *tp, struct chardat
ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
}
-
#ifdef SYSV_STYLE
#if ENABLE_FEATURE_UTMP
/* update_utmp - update our utmp entry */
@@ -666,17 +588,16 @@ static void update_utmp(const char *line)
utmpname(_PATH_UTMP);
setutent();
while ((utp = getutent())
- && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid))
- /* nothing */;
+ && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)
+ ) {
+ continue;
+ }
- if (utp) {
+ /* some inits don't initialize utmp... */
+ memset(&ut, 0, sizeof(ut));
+ safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
+ 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));
@@ -700,42 +621,43 @@ static void update_utmp(const char *line)
#endif /* CONFIG_FEATURE_UTMP */
#endif /* SYSV_STYLE */
-
int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int getty_main(int argc, char **argv)
{
- int nullfd;
- char *logname = NULL; /* login name, given to /bin/login */
+ int n;
+ char *logname; /* login name, given to /bin/login */
/* Merging these into "struct local" may _seem_ to reduce
* parameter passing, but today's gcc will inline
* statics which are called once anyway, so don't do that */
struct chardata chardata; /* set by get_logname() */
- struct termios termios; /* terminal mode bits */
- struct options options = {
- 0, /* show /etc/issue (SYSV_STYLE) */
- 0, /* no timeout */
- _PATH_LOGIN, /* default login program */
- "tty1", /* default tty line */
- "", /* modem init string */
+ struct termios termios; /* terminal mode bits */
+ struct options options;
+
+ memset(&options, 0, sizeof(options));
+ options.login = _PATH_LOGIN; /* default login program */
+ options.tty = "tty1"; /* default tty line */
+ options.initstring = ""; /* modem init string */
#ifdef ISSUE
- ISSUE, /* default issue file */
-#else
- NULL,
+ options.issue = ISSUE; /* default issue file */
#endif
- 0, /* no baud rates known yet */
- };
/* Already too late because of theoretical
* possibility of getty --help somehow triggered
* inadvertently before we reach this. Oh well. */
logmode = LOGMODE_NONE;
+
+ /* Create new session, lose controlling tty, if any */
+ /* docs/ctty.htm says:
+ * "This is allowed only when the current process
+ * is not a process group leader" - is this a problem? */
setsid();
- nullfd = xopen(bb_dev_null, O_RDWR);
- /* dup2(nullfd, 0); - no, because of possible "getty - 9600" */
- /* open_tty() will take care of fd# 0 anyway */
- dup2(nullfd, 1);
- dup2(nullfd, 2);
- while (nullfd > 2) close(nullfd--);
+
+ n = xopen(bb_dev_null, O_RDWR);
+ /* dup2(n, 0); - no, because of possible "getty - 9600" */
+ dup2(n, 1);
+ dup2(n, 2);
+ while (n > 2)
+ close(n--);
/* We want special flavor of error_msg_and_die */
die_sleep = 10;
msg_eol = "\r\n";
@@ -744,69 +666,74 @@ int getty_main(int argc, char **argv)
#ifdef DEBUGGING
dbf = xfopen(DEBUGTERM, "w");
-
- {
- int i;
-
- for (i = 1; i < argc; i++) {
- debug(argv[i]);
- debug("\n");
- }
+ for (n = 1; n < argc; n++) {
+ debug(argv[n]);
+ debug("\n");
}
#endif
/* Parse command-line arguments. */
- parse_args(argc, argv, &options);
+ parse_args(argv, &options);
+
+ debug("calling open_tty\n");
+ /* Open the tty as standard input, if it is not "-" */
+ open_tty(options.tty);
+
+ debug("duping\n");
+ ndelay_off(0);
+ xdup2(0, 1);
+ xdup2(0, 2);
+
+ /*
+ * 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.
+ */
+ ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty);
#ifdef SYSV_STYLE
#if ENABLE_FEATURE_UTMP
- /* Update the utmp file. */
+ /* Update the utmp file */
update_utmp(options.tty);
#endif
#endif
- debug("calling open_tty\n");
- /* Open the tty as standard { input, output, error }. */
- open_tty(options.tty, &termios, options.flags & F_LOCAL);
-
#ifdef __linux__
- {
- int iv;
-
- iv = getpid();
- ioctl(0, TIOCSPGRP, &iv);
- }
+ /* Make ourself a foreground process group within our session */
+ tcsetpgrp(0, getpid());
+ // /* 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);
#endif
+
/* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
debug("calling termios_init\n");
- termios_init(&termios, options.speeds[FIRST_SPEED], &options);
+ termios_init(&termios, options.speeds[0], &options);
- /* write the modem init string and DON'T flush the buffers */
+ /* 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 */
- ndelay_off(1);
+ full_write(1, options.initstring, strlen(options.initstring));
}
- /* Optionally detect the baud rate from the modem status message. */
+ /* Optionally detect the baud rate from the modem status message */
debug("before autobaud\n");
if (options.flags & F_PARSE)
- auto_baud(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termios);
+ auto_baud(line_buf, sizeof(line_buf), &termios);
- /* Set the optional timer. */
+ /* Set the optional timer */
if (options.timeout)
alarm(options.timeout);
- /* optionally wait for CR or LF before writing /etc/issue */
+ /* 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) {
+ while (safe_read(0, &ch, 1) == 1) {
ch &= 0x7f; /* strip "parity bit" */
#ifdef DEBUGGING
fprintf(dbf, "read %c\n", ch);
@@ -816,31 +743,42 @@ int getty_main(int argc, char **argv)
}
}
+ logname = NULL;
chardata = init_chardata;
if (!(options.flags & F_NOPROMPT)) {
- /* Read the login name. */
- debug("reading login name\n");
- logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
+ /* NB:termios_init already set line speed
+ * to options.speeds[0] */
+ int baud_index = 0;
+
+ while (1) {
+ /* Read the login name. */
+ debug("reading login name\n");
+ logname = get_logname(line_buf, sizeof(line_buf),
&options, &chardata, &termios);
- while (logname == NULL)
- next_speed(&termios, &options);
+ 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);
+ }
}
/* Disable timer. */
-
if (options.timeout)
alarm(0);
/* Finalize the termios settings. */
-
termios_final(&options, &termios, &chardata);
/* Now the newline character should be properly written. */
-
- write(1, "\n", 1);
+ full_write(1, "\n", 1);
/* Let the login program take care of password validation. */
-
- execl(options.login, options.login, "--", logname, (char *) 0);
+ /* 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? */
+ BB_EXECLP(options.login, options.login, "--", logname, NULL);
bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 21:53:21 +0000