source: MondoRescue/trunk/mindi-busybox/loginutils/getty.c@ 863

Last change on this file since 863 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 25.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* agetty.c - another getty program for Linux. By W. Z. Venema 1989
3 Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
4 This program is freely distributable. The entire man-page used to
5 be here. Now read the real man-page agetty.8 instead.
6
7 -f option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
8
9 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
10 - added Native Language Support
11
12 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
13 - enable hardware flow control before displaying /etc/issue
14
15*/
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <unistd.h>
20#include <string.h>
21#include <sys/ioctl.h>
22#include <errno.h>
23#include <sys/stat.h>
24#include <signal.h>
25#include <fcntl.h>
26#include <stdarg.h>
27#include <ctype.h>
28#include <getopt.h>
29#include <termios.h>
30#include "busybox.h"
31
32#ifdef CONFIG_FEATURE_UTMP
33#include <utmp.h>
34#endif
35
36#define _PATH_LOGIN "/bin/login"
37
38 /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
39#ifdef CONFIG_SYSLOGD
40#include <sys/param.h>
41#include <syslog.h>
42#endif
43
44
45 /*
46 * Some heuristics to find out what environment we are in: if it is not
47 * System V, assume it is SunOS 4.
48 */
49
50#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
51#define SYSV_STYLE /* select System V style getty */
52#ifdef CONFIG_FEATURE_WTMP
53extern void updwtmp(const char *filename, const struct utmp *ut);
54#endif
55#endif /* LOGIN_PROCESS */
56
57 /*
58 * Things you may want to modify.
59 *
60 * You may disagree with the default line-editing etc. characters defined
61 * below. Note, however, that DEL cannot be used for interrupt generation
62 * and for line editing at the same time.
63 */
64
65#ifdef SYSV_STYLE
66#include <sys/utsname.h>
67#include <time.h>
68#endif
69
70 /* If ISSUE is not defined, agetty will never display the contents of the
71 * /etc/issue file. You will not want to spit out large "issue" files at the
72 * wrong baud rate.
73 */
74#define ISSUE "/etc/issue" /* displayed before the login prompt */
75
76/* Some shorthands for control characters. */
77
78#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
79#define CR CTL('M') /* carriage return */
80#define NL CTL('J') /* line feed */
81#define BS CTL('H') /* back space */
82#define DEL CTL('?') /* delete */
83
84/* Defaults for line-editing etc. characters; you may want to change this. */
85
86#define DEF_ERASE DEL /* default erase character */
87#define DEF_INTR CTL('C') /* default interrupt character */
88#define DEF_QUIT CTL('\\') /* default quit char */
89#define DEF_KILL CTL('U') /* default kill char */
90#define DEF_EOF CTL('D') /* default EOF char */
91#define DEF_EOL '\n'
92#define DEF_SWITCH 0 /* default switch char */
93
94 /*
95 * SunOS 4.1.1 termio is broken. We must use the termios stuff instead,
96 * because the termio -> termios translation does not clear the termios
97 * CIBAUD bits. Therefore, the tty driver would sometimes report that input
98 * baud rate != output baud rate. I did not notice that problem with SunOS
99 * 4.1. We will use termios where available, and termio otherwise.
100 */
101
102/* linux 0.12 termio is broken too, if we use it c_cc[VERASE] isn't set
103 properly, but all is well if we use termios?! */
104
105#ifdef TCGETS
106#undef TCGETA
107#undef TCSETA
108#undef TCSETAW
109#define termio termios
110#define TCGETA TCGETS
111#define TCSETA TCSETS
112#define TCSETAW TCSETSW
113#endif
114
115 /*
116 * When multiple baud rates are specified on the command line, the first one
117 * we will try is the first one specified.
118 */
119
120#define FIRST_SPEED 0
121
122/* Storage for command-line options. */
123
124#define MAX_SPEED 10 /* max. nr. of baud rates */
125
126struct options {
127 int flags; /* toggle switches, see below */
128 int timeout; /* time-out period */
129 char *login; /* login program */
130 char *tty; /* name of tty */
131 char *initstring; /* modem init string */
132 char *issue; /* alternative issue file */
133 int numspeed; /* number of baud rates to try */
134 int speeds[MAX_SPEED]; /* baud rates to be tried */
135};
136
137static const char opt_string[] = "I:LH:f:hil:mt:wn";
138#define F_INITSTRING (1<<0) /* initstring is set */
139#define F_LOCAL (1<<1) /* force local */
140#define F_FAKEHOST (1<<2) /* force fakehost */
141#define F_CUSTISSUE (1<<3) /* give alternative issue file */
142#define F_RTSCTS (1<<4) /* enable RTS/CTS flow control */
143#define F_ISSUE (1<<5) /* display /etc/issue */
144#define F_LOGIN (1<<6) /* non-default login program */
145#define F_PARSE (1<<7) /* process modem status messages */
146#define F_TIMEOUT (1<<8) /* time out */
147#define F_WAITCRLF (1<<9) /* wait for CR or LF */
148#define F_NOPROMPT (1<<10) /* don't ask for login name! */
149
150/* Storage for things detected while the login name was read. */
151
152struct chardata {
153 int erase; /* erase character */
154 int kill; /* kill character */
155 int eol; /* end-of-line character */
156 int parity; /* what parity did we see */
157 int capslock; /* upper case without lower case */
158};
159
160/* Initial values for the above. */
161
162static struct chardata init_chardata = {
163 DEF_ERASE, /* default erase character */
164 DEF_KILL, /* default kill character */
165 13, /* default eol char */
166 0, /* space parity */
167 0, /* no capslock */
168};
169
170#if 0
171struct Speedtab {
172 long speed;
173 int code;
174};
175
176static struct Speedtab speedtab[] = {
177 {50, B50},
178 {75, B75},
179 {110, B110},
180 {134, B134},
181 {150, B150},
182 {200, B200},
183 {300, B300},
184 {600, B600},
185 {1200, B1200},
186 {1800, B1800},
187 {2400, B2400},
188 {4800, B4800},
189 {9600, B9600},
190#ifdef B19200
191 {19200, B19200},
192#endif
193#ifdef B38400
194 {38400, B38400},
195#endif
196#ifdef EXTA
197 {19200, EXTA},
198#endif
199#ifdef EXTB
200 {38400, EXTB},
201#endif
202#ifdef B57600
203 {57600, B57600},
204#endif
205#ifdef B115200
206 {115200, B115200},
207#endif
208#ifdef B230400
209 {230400, B230400},
210#endif
211 {0, 0},
212};
213#endif
214
215
216#ifdef SYSV_STYLE
217#ifdef CONFIG_FEATURE_UTMP
218static void update_utmp(char *line);
219#endif
220#endif
221
222/* The following is used for understandable diagnostics. */
223
224/* Fake hostname for ut_host specified on command line. */
225static char *fakehost = NULL;
226
227/* ... */
228#ifdef DEBUGGING
229#define debug(s) fprintf(dbf,s); fflush(dbf)
230#define DEBUGTERM "/dev/ttyp0"
231FILE *dbf;
232#else
233#define debug(s) /* nothing */
234#endif
235
236
237/*
238 * output error messages
239 */
240static void error(const char *fmt, ...) ATTRIBUTE_NORETURN;
241static void error(const char *fmt, ...)
242{
243 va_list va_alist;
244 char buf[256];
245
246#ifdef CONFIG_SYSLOGD
247 va_start(va_alist, fmt);
248 vsnprintf(buf, sizeof(buf), fmt, va_alist);
249 openlog(bb_applet_name, 0, LOG_AUTH);
250 syslog(LOG_ERR, "%s", buf);
251 closelog();
252#else
253 int fd;
254 size_t l;
255
256 snprintf(buf, sizeof(buf), "%s: ", bb_applet_name);
257 l = strlen(buf);
258 va_start(va_alist, fmt);
259 vsnprintf(buf + l, sizeof(buf) - l, fmt, va_alist);
260 l = strlen(buf);
261 /* truncate if need */
262 if((l + 3) > sizeof(buf))
263 l = sizeof(buf) - 3;
264 /* add \r\n always */
265 buf[l++] = '\r';
266 buf[l++] = '\n';
267 buf[l] = 0;
268 if ((fd = open("/dev/console", 1)) >= 0) {
269 write(fd, buf, l);
270 close(fd);
271 }
272#endif
273
274 va_end(va_alist);
275
276 (void) sleep((unsigned) 10); /* be kind to init(8) */
277 exit(1);
278}
279
280
281
282/* bcode - convert speed string to speed code; return 0 on failure */
283static int bcode(const char *s)
284{
285 int r;
286 unsigned long value;
287 if (safe_strtoul((char *)s, &value)) {
288 return -1;
289 }
290 if ((r = tty_value_to_baud(value)) > 0) {
291 return r;
292 }
293 return 0;
294}
295
296
297/* parse_speeds - parse alternate baud rates */
298static void parse_speeds(struct options *op, char *arg)
299{
300 char *cp;
301
302 debug("entered parse_speeds\n");
303 for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
304 if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
305 error("bad speed: %s", cp);
306 if (op->numspeed > MAX_SPEED)
307 error("too many alternate speeds");
308 }
309 debug("exiting parsespeeds\n");
310}
311
312
313/* parse-args - parse command-line arguments */
314static void parse_args(int argc, char **argv, struct options *op)
315{
316 char *ts;
317
318 op->flags = bb_getopt_ulflags(argc, argv, opt_string,
319 &(op->initstring), &fakehost, &(op->issue),
320 &(op->login), &ts);
321 if(op->flags & F_INITSTRING) {
322 const char *p = op->initstring;
323 char *q;
324
325 q = op->initstring = bb_xstrdup(op->initstring);
326 /* copy optarg into op->initstring decoding \ddd
327 octal codes into chars */
328 while (*p) {
329 if (*p == '\\') {
330 p++;
331 *q++ = bb_process_escape_sequence(&p);
332 } else {
333 *q++ = *p++;
334 }
335 }
336 *q = '\0';
337 }
338 op->flags ^= F_ISSUE; /* revert flag show /etc/issue */
339 if(op->flags & F_TIMEOUT) {
340 if ((op->timeout = atoi(ts)) <= 0)
341 error("bad timeout value: %s", ts);
342 }
343 debug("after getopt loop\n");
344 if (argc < optind + 2) /* check parameter count */
345 bb_show_usage();
346
347 /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
348 if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
349 /* a number first, assume it's a speed (BSD style) */
350 parse_speeds(op, argv[optind++]); /* baud rate(s) */
351 op->tty = argv[optind]; /* tty name */
352 } else {
353 op->tty = argv[optind++]; /* tty name */
354 parse_speeds(op, argv[optind]); /* baud rate(s) */
355 }
356
357 optind++;
358 if (argc > optind && argv[optind])
359 setenv("TERM", argv[optind], 1);
360
361 debug("exiting parseargs\n");
362}
363
364/* open_tty - set up tty as standard { input, output, error } */
365static void open_tty(char *tty, struct termio *tp, int local)
366{
367 int chdir_to_root = 0;
368
369 /* Set up new standard input, unless we are given an already opened port. */
370
371 if (strcmp(tty, "-")) {
372 struct stat st;
373 int fd;
374
375 /* Sanity checks... */
376
377 if (chdir("/dev"))
378 error("/dev: chdir() failed: %m");
379 chdir_to_root = 1;
380 if (stat(tty, &st) < 0)
381 error("/dev/%s: %m", tty);
382 if ((st.st_mode & S_IFMT) != S_IFCHR)
383 error("/dev/%s: not a character device", tty);
384
385 /* Open the tty as standard input. */
386
387 close(0);
388 debug("open(2)\n");
389 fd = open(tty, O_RDWR | O_NONBLOCK, 0);
390 if (fd != 0)
391 error("/dev/%s: cannot open as standard input: %m", tty);
392 } else {
393
394 /*
395 * Standard input should already be connected to an open port. Make
396 * sure it is open for read/write.
397 */
398
399 if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR)
400 error("%s: not open for read/write", tty);
401 }
402
403 /* Replace current standard output/error fd's with new ones */
404 debug("duping\n");
405 if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1 ||
406 dup2(STDIN_FILENO, STDERR_FILENO) == -1)
407 error("%s: dup problem: %m", tty); /* we have a problem */
408
409 /*
410 * The following ioctl will fail if stdin is not a tty, but also when
411 * there is noise on the modem control lines. In the latter case, the
412 * common course of action is (1) fix your cables (2) give the modem more
413 * time to properly reset after hanging up. SunOS users can achieve (2)
414 * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
415 * 5 seconds seems to be a good value.
416 */
417
418 if (ioctl(0, TCGETA, tp) < 0)
419 error("%s: ioctl: %m", tty);
420
421 /*
422 * It seems to be a terminal. Set proper protections and ownership. Mode
423 * 0622 is suitable for SYSV <4 because /bin/login does not change
424 * protections. SunOS 4 login will change the protections to 0620 (write
425 * access for group tty) after the login has succeeded.
426 */
427
428#ifdef DEBIAN
429 {
430 /* tty to root.dialout 660 */
431 struct group *gr;
432 int id;
433
434 id = (gr = getgrnam("dialout")) ? gr->gr_gid : 0;
435 chown(tty, 0, id);
436 chmod(tty, 0660);
437
438 /* vcs,vcsa to root.sys 600 */
439 if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
440 char *vcs, *vcsa;
441
442 if (!(vcs = strdup(tty)))
443 error("Can't malloc for vcs");
444 if (!(vcsa = malloc(strlen(tty) + 2)))
445 error("Can't malloc for vcsa");
446 strcpy(vcs, "vcs");
447 strcpy(vcs + 3, tty + 3);
448 strcpy(vcsa, "vcsa");
449 strcpy(vcsa + 4, tty + 3);
450
451 id = (gr = getgrnam("sys")) ? gr->gr_gid : 0;
452 chown(vcs, 0, id);
453 chmod(vcs, 0600);
454 chown(vcsa, 0, id);
455 chmod(vcs, 0600);
456
457 free(vcs);
458 free(vcsa);
459 }
460 }
461#else
462 (void) chown(tty, 0, 0); /* root, sys */
463 (void) chmod(tty, 0622); /* crw--w--w- */
464#endif
465 if(chdir_to_root && chdir("/"))
466 error("chdir to / failed: %m");
467}
468
469/* termio_init - initialize termio settings */
470static void termio_init(struct termio *tp, int speed, struct options *op)
471{
472 /*
473 * Initial termio settings: 8-bit characters, raw-mode, blocking i/o.
474 * Special characters are set after we have read the login name; all
475 * reads will be done in raw mode anyway. Errors will be dealt with
476 * lateron.
477 */
478#ifdef __linux__
479 /* flush input and output queues, important for modems! */
480 (void) ioctl(0, TCFLSH, TCIOFLUSH);
481#endif
482
483 tp->c_cflag = CS8 | HUPCL | CREAD | speed;
484 if (op->flags & F_LOCAL) {
485 tp->c_cflag |= CLOCAL;
486 }
487
488 tp->c_iflag = tp->c_lflag = tp->c_oflag = tp->c_line = 0;
489 tp->c_cc[VMIN] = 1;
490 tp->c_cc[VTIME] = 0;
491
492 /* Optionally enable hardware flow control */
493
494#ifdef CRTSCTS
495 if (op->flags & F_RTSCTS)
496 tp->c_cflag |= CRTSCTS;
497#endif
498
499 (void) ioctl(0, TCSETA, tp);
500
501 /* go to blocking input even in local mode */
502 fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
503
504 debug("term_io 2\n");
505}
506
507/* auto_baud - extract baud rate from modem status message */
508static void auto_baud(struct termio *tp)
509{
510 int speed;
511 int vmin;
512 unsigned iflag;
513 char buf[BUFSIZ];
514 char *bp;
515 int nread;
516
517 /*
518 * This works only if the modem produces its status code AFTER raising
519 * the DCD line, and if the computer is fast enough to set the proper
520 * baud rate before the message has gone by. We expect a message of the
521 * following format:
522 *
523 * <junk><number><junk>
524 *
525 * The number is interpreted as the baud rate of the incoming call. If the
526 * modem does not tell us the baud rate within one second, we will keep
527 * using the current baud rate. It is advisable to enable BREAK
528 * processing (comma-separated list of baud rates) if the processing of
529 * modem status messages is enabled.
530 */
531
532 /*
533 * Use 7-bit characters, don't block if input queue is empty. Errors will
534 * be dealt with lateron.
535 */
536
537 iflag = tp->c_iflag;
538 tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
539 vmin = tp->c_cc[VMIN];
540 tp->c_cc[VMIN] = 0; /* don't block if queue empty */
541 (void) ioctl(0, TCSETA, tp);
542
543 /*
544 * Wait for a while, then read everything the modem has said so far and
545 * try to extract the speed of the dial-in call.
546 */
547
548 (void) sleep(1);
549 if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) {
550 buf[nread] = '\0';
551 for (bp = buf; bp < buf + nread; bp++) {
552 if (isascii(*bp) && isdigit(*bp)) {
553 if ((speed = bcode(bp))) {
554 tp->c_cflag &= ~CBAUD;
555 tp->c_cflag |= speed;
556 }
557 break;
558 }
559 }
560 }
561 /* Restore terminal settings. Errors will be dealt with lateron. */
562
563 tp->c_iflag = iflag;
564 tp->c_cc[VMIN] = vmin;
565 (void) ioctl(0, TCSETA, tp);
566}
567
568/* next_speed - select next baud rate */
569static void next_speed(struct termio *tp, struct options *op)
570{
571 static int baud_index = FIRST_SPEED; /* current speed index */
572
573 baud_index = (baud_index + 1) % op->numspeed;
574 tp->c_cflag &= ~CBAUD;
575 tp->c_cflag |= op->speeds[baud_index];
576 (void) ioctl(0, TCSETA, tp);
577}
578
579
580/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
581static void do_prompt(struct options *op, struct termio *tp)
582{
583#ifdef ISSUE /* optional: show /etc/issue */
584 print_login_issue(op->issue, op->tty);
585#endif
586 print_login_prompt();
587}
588
589/* caps_lock - string contains upper case without lower case */
590/* returns 1 if true, 0 if false */
591static int caps_lock(const char *s)
592{
593 int capslock;
594
595 for (capslock = 0; *s; s++) {
596 if (islower(*s))
597 return (0);
598 if (capslock == 0)
599 capslock = isupper(*s);
600 }
601 return (capslock);
602}
603
604#define logname bb_common_bufsiz1
605/* get_logname - get user name, establish parity, speed, erase, kill, eol */
606/* return NULL on failure, logname on success */
607static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp)
608{
609 char *bp;
610 char c; /* input character, full eight bits */
611 char ascval; /* low 7 bits of input character */
612 int bits; /* # of "1" bits per character */
613 int mask; /* mask with 1 bit up */
614 static char *erase[] = { /* backspace-space-backspace */
615 "\010\040\010", /* space parity */
616 "\010\040\010", /* odd parity */
617 "\210\240\210", /* even parity */
618 "\210\240\210", /* no parity */
619 };
620
621 /* Initialize kill, erase, parity etc. (also after switching speeds). */
622
623 *cp = init_chardata;
624
625 /* Flush pending input (esp. after parsing or switching the baud rate). */
626
627 (void) sleep(1);
628 (void) ioctl(0, TCFLSH, TCIFLUSH);
629
630 /* Prompt for and read a login name. */
631
632 for (*logname = 0; *logname == 0; /* void */ ) {
633
634 /* Write issue file and prompt, with "parity" bit == 0. */
635
636 do_prompt(op, tp);
637
638 /* Read name, watch for break, parity, erase, kill, end-of-line. */
639
640 for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
641
642 /* Do not report trivial EINTR/EIO errors. */
643
644 if (read(0, &c, 1) < 1) {
645 if (errno == EINTR || errno == EIO)
646 exit(0);
647 error("%s: read: %m", op->tty);
648 }
649 /* Do BREAK handling elsewhere. */
650
651 if ((c == 0) && op->numspeed > 1)
652 /* return (0); */
653 return NULL;
654
655 /* Do parity bit handling. */
656
657 if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
658 for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
659 if (mask & ascval)
660 bits++; /* count "1" bits */
661 cp->parity |= ((bits & 1) ? 1 : 2);
662 }
663 /* Do erase, kill and end-of-line processing. */
664
665 switch (ascval) {
666 case CR:
667 case NL:
668 *bp = 0; /* terminate logname */
669 cp->eol = ascval; /* set end-of-line char */
670 break;
671 case BS:
672 case DEL:
673 case '#':
674 cp->erase = ascval; /* set erase character */
675 if (bp > logname) {
676 (void) write(1, erase[cp->parity], 3);
677 bp--;
678 }
679 break;
680 case CTL('U'):
681 case '@':
682 cp->kill = ascval; /* set kill character */
683 while (bp > logname) {
684 (void) write(1, erase[cp->parity], 3);
685 bp--;
686 }
687 break;
688 case CTL('D'):
689 exit(0);
690 default:
691 if (!isascii(ascval) || !isprint(ascval)) {
692 /* ignore garbage characters */ ;
693 } else if (bp - logname >= sizeof(logname) - 1) {
694 error("%s: input overrun", op->tty);
695 } else {
696 (void) write(1, &c, 1); /* echo the character */
697 *bp++ = ascval; /* and store it */
698 }
699 break;
700 }
701 }
702 }
703 /* Handle names with upper case and no lower case. */
704
705 if ((cp->capslock = caps_lock(logname))) {
706 for (bp = logname; *bp; bp++)
707 if (isupper(*bp))
708 *bp = tolower(*bp); /* map name to lower case */
709 }
710 return (logname);
711}
712
713/* termio_final - set the final tty mode bits */
714static void termio_final(struct options *op, struct termio *tp, struct chardata *cp)
715{
716 /* General terminal-independent stuff. */
717
718 tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
719 tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
720 /* no longer| ECHOCTL | ECHOPRT */
721 tp->c_oflag |= OPOST;
722 /* tp->c_cflag = 0; */
723 tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
724 tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
725 tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
726 tp->c_cc[VEOL] = DEF_EOL;
727 tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
728
729 /* Account for special characters seen in input. */
730
731 if (cp->eol == CR) {
732 tp->c_iflag |= ICRNL; /* map CR in input to NL */
733 tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
734 }
735 tp->c_cc[VERASE] = cp->erase; /* set erase character */
736 tp->c_cc[VKILL] = cp->kill; /* set kill character */
737
738 /* Account for the presence or absence of parity bits in input. */
739
740 switch (cp->parity) {
741 case 0: /* space (always 0) parity */
742 break;
743 case 1: /* odd parity */
744 tp->c_cflag |= PARODD;
745 /* FALLTHROUGH */
746 case 2: /* even parity */
747 tp->c_cflag |= PARENB;
748 tp->c_iflag |= INPCK | ISTRIP;
749 /* FALLTHROUGH */
750 case (1 | 2): /* no parity bit */
751 tp->c_cflag &= ~CSIZE;
752 tp->c_cflag |= CS7;
753 break;
754 }
755 /* Account for upper case without lower case. */
756
757 if (cp->capslock) {
758 tp->c_iflag |= IUCLC;
759 tp->c_lflag |= XCASE;
760 tp->c_oflag |= OLCUC;
761 }
762 /* Optionally enable hardware flow control */
763
764#ifdef CRTSCTS
765 if (op->flags & F_RTSCTS)
766 tp->c_cflag |= CRTSCTS;
767#endif
768
769 /* Finally, make the new settings effective */
770
771 if (ioctl(0, TCSETA, tp) < 0)
772 error("%s: ioctl: TCSETA: %m", op->tty);
773}
774
775
776#ifdef SYSV_STYLE
777#ifdef CONFIG_FEATURE_UTMP
778/* update_utmp - update our utmp entry */
779static void update_utmp(char *line)
780{
781 struct utmp ut;
782 struct utmp *utp;
783 time_t t;
784 int mypid = getpid();
785#if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
786 struct flock lock;
787#endif
788
789 /*
790 * The utmp file holds miscellaneous information about things started by
791 * /sbin/init and other system-related events. Our purpose is to update
792 * the utmp entry for the current process, in particular the process type
793 * and the tty line we are listening to. Return successfully only if the
794 * utmp file can be opened for update, and if we are able to find our
795 * entry in the utmp file.
796 */
797 if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
798 close(creat(_PATH_UTMP, 0664));
799 }
800 utmpname(_PATH_UTMP);
801 setutent();
802 while ((utp = getutent())
803 && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
804 ;
805
806 if (utp) {
807 memcpy(&ut, utp, sizeof(ut));
808 } else {
809 /* some inits don't initialize utmp... */
810 memset(&ut, 0, sizeof(ut));
811 safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
812 }
813 /*endutent(); */
814
815 strcpy(ut.ut_user, "LOGIN");
816 safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
817 if (fakehost)
818 safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
819 time(&t);
820 ut.ut_time = t;
821 ut.ut_type = LOGIN_PROCESS;
822 ut.ut_pid = mypid;
823
824 pututline(&ut);
825 endutent();
826
827#ifdef CONFIG_FEATURE_WTMP
828 if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
829 close(creat(bb_path_wtmp_file, 0664));
830 updwtmp(bb_path_wtmp_file, &ut);
831#endif
832}
833
834#endif /* CONFIG_FEATURE_UTMP */
835#endif /* SYSV_STYLE */
836
837
838#undef logname
839int getty_main(int argc, char **argv)
840{
841 char *logname = NULL; /* login name, given to /bin/login */
842 struct chardata chardata; /* set by get_logname() */
843 struct termio termio; /* terminal mode bits */
844 static struct options options = {
845 0, /* show /etc/issue (SYSV_STYLE) */
846 0, /* no timeout */
847 _PATH_LOGIN, /* default login program */
848 "tty1", /* default tty line */
849 "", /* modem init string */
850#ifdef ISSUE
851 ISSUE, /* default issue file */
852#else
853 NULL,
854#endif
855 0, /* no baud rates known yet */
856 };
857
858#ifdef DEBUGGING
859 dbf = bb_xfopen(DEBUGTERM, "w");
860
861 {
862 int i;
863
864 for (i = 1; i < argc; i++) {
865 debug(argv[i]);
866 debug("\n");
867 }
868 }
869#endif
870
871 /* Parse command-line arguments. */
872
873 parse_args(argc, argv, &options);
874
875#ifdef __linux__
876 setsid();
877#endif
878
879 /* Update the utmp file. */
880
881
882#ifdef SYSV_STYLE
883#ifdef CONFIG_FEATURE_UTMP
884 update_utmp(options.tty);
885#endif
886#endif
887
888 debug("calling open_tty\n");
889 /* Open the tty as standard { input, output, error }. */
890 open_tty(options.tty, &termio, options.flags & F_LOCAL);
891
892#ifdef __linux__
893 {
894 int iv;
895
896 iv = getpid();
897 ioctl(0, TIOCSPGRP, &iv);
898 }
899#endif
900 /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
901 debug("calling termio_init\n");
902 termio_init(&termio, options.speeds[FIRST_SPEED], &options);
903
904 /* write the modem init string and DON'T flush the buffers */
905 if (options.flags & F_INITSTRING) {
906 debug("writing init string\n");
907 write(1, options.initstring, strlen(options.initstring));
908 }
909
910 if (!(options.flags & F_LOCAL)) {
911 /* go to blocking write mode unless -L is specified */
912 fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
913 }
914
915 /* Optionally detect the baud rate from the modem status message. */
916 debug("before autobaud\n");
917 if (options.flags & F_PARSE)
918 auto_baud(&termio);
919
920 /* Set the optional timer. */
921 if (options.timeout)
922 (void) alarm((unsigned) options.timeout);
923
924 /* optionally wait for CR or LF before writing /etc/issue */
925 if (options.flags & F_WAITCRLF) {
926 char ch;
927
928 debug("waiting for cr-lf\n");
929 while (read(0, &ch, 1) == 1) {
930 ch &= 0x7f; /* strip "parity bit" */
931#ifdef DEBUGGING
932 fprintf(dbf, "read %c\n", ch);
933#endif
934 if (ch == '\n' || ch == '\r')
935 break;
936 }
937 }
938
939 chardata = init_chardata;
940 if (!(options.flags & F_NOPROMPT)) {
941 /* Read the login name. */
942 debug("reading login name\n");
943 /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
944 while ((logname = get_logname(&options, &chardata, &termio)) ==
945 NULL) next_speed(&termio, &options);
946 }
947
948 /* Disable timer. */
949
950 if (options.timeout)
951 (void) alarm(0);
952
953 /* Finalize the termio settings. */
954
955 termio_final(&options, &termio, &chardata);
956
957 /* Now the newline character should be properly written. */
958
959 (void) write(1, "\n", 1);
960
961 /* Let the login program take care of password validation. */
962
963 (void) execl(options.login, options.login, "--", logname, (char *) 0);
964 error("%s: can't exec %s: %m", options.tty, options.login);
965}
966
Note: See TracBrowser for help on using the repository browser.