*
* 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.
- *
*/
#include "libbb.h"
#include <syslog.h>
#if ENABLE_FEATURE_UTMP
-#include <utmp.h>
+#include <utmp.h> /* updwtmp() */
+#endif
+
+#ifndef IUCLC
+# define IUCLC 0
#endif
/*
* System V, assume it is SunOS 4.
*/
#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
-#define SYSV_STYLE /* select System V style getty */
#include <sys/utsname.h>
-#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
+#else /* if !sysV style, wtmp/utmp code is off */
+#undef ENABLE_FEATURE_UTMP
+#undef ENABLE_FEATURE_WTMP
+#define ENABLE_FEATURE_UTMP 0
+#define ENABLE_FEATURE_WTMP 0
#endif /* LOGIN_PROCESS */
/*
/* I doubt there are systems which still need this */
#undef HANDLE_ALLCAPS
+#undef ANCIENT_BS_KILL_CHARS
#define _PATH_LOGIN "/bin/login"
#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 */
* 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[] = "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 */
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
};
+
/* Initial values for the above. */
static const struct chardata init_chardata = {
DEF_ERASE, /* default erase character */
#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 fake hostname */
+#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"
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 */
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, ",")) {
- if ((op->speeds[op->numspeed++] = bcode(cp)) <= 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);
+ /* note: arg "0" turns into speed B0 */
+ op->numspeed++;
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 **fakehost_p)
{
char *ts;
- op->flags = getopt32(argc, argv, opt_string,
- &(op->initstring), &fakehost, &(op->issue),
- &(op->login), &ts);
+ opt_complementary = "-2:t+"; /* at least 2 args; -t N */
+ op->flags = getopt32(argv, opt_string,
+ &(op->initstring), fakehost_p, &(op->issue),
+ &(op->login), &op->timeout);
+ argv += optind;
if (op->flags & F_INITSTRING) {
const char *p = op->initstring;
char *q;
- op->initstring = q = xstrdup(op->initstring);
+ op->initstring = q = xstrdup(p);
/* copy optarg into op->initstring decoding \ddd
octal codes into chars */
while (*p) {
}
*q = '\0';
}
- op->flags ^= F_ISSUE; /* revert flag show /etc/issue */
- if (op->flags & F_TIMEOUT) {
- op->timeout = xatoul_range(ts, 1, INT_MAX);
- }
- argv += optind;
- argc -= optind;
- debug("after getopt loop\n");
- if (argc < 2) /* check parameter count */
- bb_show_usage();
+ 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" */
+ 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);
+// TODO: if applet_name is set to "getty: TTY", bb_error_msg's get simpler!
+// grep for "%s:"
- debug("exiting parseargs\n");
-}
+ if (argv[2])
+ xsetenv("TERM", argv[2]);
-static void xdup2(int srcfd, int dstfd, const char *tty)
-{
- if (dup2(srcfd, dstfd) == -1)
- bb_perror_msg_and_die("%s: dup", tty);
+ 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 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 (!S_ISCHR(st.st_mode))
+// bb_error_msg_and_die("%s: not a character device", tty);
- 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);
+ 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);
- xdup2(fd, 0, tty);
- while (fd > 2) close(fd--);
+ close(0);
+ /*fd =*/ xopen(tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */
+
+// /* Restore current directory */
+// fchdir(cur_dir_fd);
+
+ /* Open the tty as standard input, continued */
+// 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, 0620); /* crw--w---- */
} 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)
+ 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, tty);
- xdup2(0, 2, tty);
-
- /*
- * 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, TCGETS, tp) < 0)
- bb_perror_msg_and_die("%s: ioctl(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 */
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
*/
#ifdef __linux__
/* flush input and output queues, important for modems! */
- ioctl(0, TCFLSH, TCIOFLUSH);
+ ioctl(0, TCFLSH, TCIOFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
#endif
-
- tp->c_cflag = CS8 | HUPCL | CREAD | speed;
- if (op->flags & F_LOCAL) {
- tp->c_cflag |= CLOCAL;
+ 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_oflag = OPOST | ONLCR;
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 */
- fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
+ tcsetattr_stdin_TCSANOW(tp);
debug("term_io 2\n");
}
* 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 */
- ioctl(0, TCSETS, tp);
+ tp->c_cc[VMIN] = 0; /* don't block if queue empty */
+ 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 = 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 (isascii(*bp) && isdigit(*bp)) {
+ if (isdigit(*bp)) {
speed = bcode(bp);
- if (speed) {
+ if (speed > 0) {
tp->c_cflag &= ~CBAUD;
tp->c_cflag |= speed;
}
}
}
}
- /* 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);
+ 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);
}
#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++))
}
#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)
+ 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 */
};
- /* 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);
+ ioctl(0, TCFLSH, TCIFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
/* 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;
cp->eol = '\0';
while (cp->eol == '\0') {
/* Do not report trivial EINTR/EIO errors. */
- if (read(0, &c, 1) < 1) {
+ if (read(STDIN_FILENO, &c, 1) < 1) {
if (errno == EINTR || errno == EIO)
- exit(0);
+ exit(EXIT_SUCCESS);
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;
/* 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:
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(STDOUT_FILENO, 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(STDOUT_FILENO, erase[cp->parity], 3);
bp--;
}
break;
case CTL('D'):
- exit(0);
+ exit(EXIT_SUCCESS);
default:
- if (!isascii(ascval) || !isprint(ascval)) {
+ if (!isprint(ascval)) {
/* ignore garbage characters */
- } else if (bp - logname >= size_logname - 1) {
+ } else if ((int)(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(STDOUT_FILENO, &c, 1); /* echo the character */
*bp++ = ascval; /* and store it */
}
break;
/* 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))
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[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[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 */
-
- if (ioctl(0, TCSETS, tp) < 0)
- bb_perror_msg_and_die("%s: ioctl(TCSETS)", op->tty);
+ /* It's tcsetattr_stdin_TCSANOW() + error check */
+ ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
}
-
-#ifdef SYSV_STYLE
#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)
+static NOINLINE void update_utmp(const char *line, char *fakehost)
{
struct utmp ut;
struct utmp *utp;
- time_t t;
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
* 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));
- }
+ touch(_PATH_UTMP);
+
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));
+ while ((utp = getutent()) != NULL) {
+ if (utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid) {
+ memcpy(&ut, utp, sizeof(ut));
+ break;
+ }
}
- /* 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_tv.tv_sec = time(NULL);
ut.ut_type = LOGIN_PROCESS;
ut.ut_pid = mypid;
endutent();
#if ENABLE_FEATURE_WTMP
- if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
- close(creat(bb_path_wtmp_file, 0664));
+ touch(bb_path_wtmp_file);
updwtmp(bb_path_wtmp_file, &ut);
#endif
}
-
#endif /* CONFIG_FEATURE_UTMP */
-#endif /* SYSV_STYLE */
-
-int getty_main(int argc, char **argv);
-int getty_main(int argc, char **argv)
+int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int getty_main(int argc UNUSED_PARAM, char **argv)
{
- int nullfd;
- char *logname = NULL; /* login name, given to /bin/login */
+ int n;
+ 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
* 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;
+
+ chardata = init_chardata;
+
+ 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. */
+ /* Parse command-line arguments. */
+ parse_args(argv, &options, &fakehost);
+
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--);
- /* We want special flavor of error_msg_and_die */
+ /* close stdio, and stray descriptors, just in case */
+ n = xopen(bb_dev_null, O_RDWR);
+ /* dup2(n, 0); - no, we need to handle "getty - 9600" too */
+ xdup2(n, 1);
+ xdup2(n, 2);
+ while (n > 2)
+ close(n--);
+
+ /* 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");
-
- {
- int i;
-
- for (i = 1; i < argc; i++) {
- debug(argv[i]);
- debug("\n");
- }
+ dbf = xfopen_for_write(DEBUGTERM);
+ for (n = 1; argv[n]; n++) {
+ debug(argv[n]);
+ debug("\n");
}
#endif
- /* Parse command-line arguments. */
- parse_args(argc, argv, &options);
-
-#ifdef SYSV_STYLE
-#if ENABLE_FEATURE_UTMP
- /* Update the utmp file. */
- update_utmp(options.tty);
-#endif
-#endif
-
+ /* 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 the tty as standard { input, output, error }. */
- open_tty(options.tty, &termios, options.flags & F_LOCAL);
+ open_tty(options.tty);
+ ndelay_off(0);
+ 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.
+ */
+ /* tcgetattr() + error check */
+ ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty);
#ifdef __linux__
- {
- int iv;
+// 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, getpid());
+#endif
- iv = getpid();
- ioctl(0, TIOCSPGRP, &iv);
- }
+#if ENABLE_FEATURE_UTMP
+ /* Update the utmp file. This tty is ours now! */
+ update_utmp(options.tty, fakehost);
#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 */
- fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
+ /* todo: use xwrite_str? */
+ full_write(STDOUT_FILENO, 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. */
- if (options.timeout)
- alarm(options.timeout);
+ /* Set the optional timer */
+ alarm(options.timeout); /* if 0, alarm is not set */
- /* 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(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;
}
}
- chardata = init_chardata;
+ logname = NULL;
if (!(options.flags & F_NOPROMPT)) {
- /* Read the login name. */
- debug("reading login name\n");
- logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
- &options, &chardata, &termios);
- while (logname == NULL)
- next_speed(&termios, &options);
+ /* 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);
+ if (logname)
+ break;
+ /* we are here only if options.numspeed > 1 */
+ baud_index = (baud_index + 1) % options.numspeed;
+ 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. */
-
- write(1, "\n", 1);
+ full_write(STDOUT_FILENO, "\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. */
+ /* 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);
}
projects / oweals / busybox.git / blobdiff