source: MondoRescue/branches/2.2.2/mindi-busybox/loginutils/getty.c@ 1247

Last change on this file since 1247 was 902, checked in by Bruno Cornec, 17 years ago

mindi-busybox now uses busybox 1.2.2 (Thanks Rob for that last update and good lucck for your future projects).
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_line = 0;
489 tp->c_oflag = OPOST | ONLCR;
490 tp->c_cc[VMIN] = 1;
491 tp->c_cc[VTIME] = 0;
492
493 /* Optionally enable hardware flow control */
494
495#ifdef CRTSCTS
496 if (op->flags & F_RTSCTS)
497 tp->c_cflag |= CRTSCTS;
498#endif
499
500 (void) ioctl(0, TCSETA, tp);
501
502 /* go to blocking input even in local mode */
503 fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
504
505 debug("term_io 2\n");
506}
507
508/* auto_baud - extract baud rate from modem status message */
509static void auto_baud(struct termio *tp)
510{
511 int speed;
512 int vmin;
513 unsigned iflag;
514 char buf[BUFSIZ];
515 char *bp;
516 int nread;
517
518 /*
519 * This works only if the modem produces its status code AFTER raising
520 * the DCD line, and if the computer is fast enough to set the proper
521 * baud rate before the message has gone by. We expect a message of the
522 * following format:
523 *
524 * <junk><number><junk>
525 *
526 * The number is interpreted as the baud rate of the incoming call. If the
527 * modem does not tell us the baud rate within one second, we will keep
528 * using the current baud rate. It is advisable to enable BREAK
529 * processing (comma-separated list of baud rates) if the processing of
530 * modem status messages is enabled.
531 */
532
533 /*
534 * Use 7-bit characters, don't block if input queue is empty. Errors will
535 * be dealt with lateron.
536 */
537
538 iflag = tp->c_iflag;
539 tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
540 vmin = tp->c_cc[VMIN];
541 tp->c_cc[VMIN] = 0; /* don't block if queue empty */
542 (void) ioctl(0, TCSETA, tp);
543
544 /*
545 * Wait for a while, then read everything the modem has said so far and
546 * try to extract the speed of the dial-in call.
547 */
548
549 (void) sleep(1);
550 if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) {
551 buf[nread] = '\0';
552 for (bp = buf; bp < buf + nread; bp++) {
553 if (isascii(*bp) && isdigit(*bp)) {
554 if ((speed = bcode(bp))) {
555 tp->c_cflag &= ~CBAUD;
556 tp->c_cflag |= speed;
557 }
558 break;
559 }
560 }
561 }
562 /* Restore terminal settings. Errors will be dealt with lateron. */
563
564 tp->c_iflag = iflag;
565 tp->c_cc[VMIN] = vmin;
566 (void) ioctl(0, TCSETA, tp);
567}
568
569/* next_speed - select next baud rate */
570static void next_speed(struct termio *tp, struct options *op)
571{
572 static int baud_index = FIRST_SPEED; /* current speed index */
573
574 baud_index = (baud_index + 1) % op->numspeed;
575 tp->c_cflag &= ~CBAUD;
576 tp->c_cflag |= op->speeds[baud_index];
577 (void) ioctl(0, TCSETA, tp);
578}
579
580
581/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
582static void do_prompt(struct options *op, struct termio *tp)
583{
584#ifdef ISSUE /* optional: show /etc/issue */
585 print_login_issue(op->issue, op->tty);
586#endif
587 print_login_prompt();
588}
589
590/* caps_lock - string contains upper case without lower case */
591/* returns 1 if true, 0 if false */
592static int caps_lock(const char *s)
593{
594 int capslock;
595
596 for (capslock = 0; *s; s++) {
597 if (islower(*s))
598 return (0);
599 if (capslock == 0)
600 capslock = isupper(*s);
601 }
602 return (capslock);
603}
604
605#define logname bb_common_bufsiz1
606/* get_logname - get user name, establish parity, speed, erase, kill, eol */
607/* return NULL on failure, logname on success */
608static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp)
609{
610 char *bp;
611 char c; /* input character, full eight bits */
612 char ascval; /* low 7 bits of input character */
613 int bits; /* # of "1" bits per character */
614 int mask; /* mask with 1 bit up */
615 static char *erase[] = { /* backspace-space-backspace */
616 "\010\040\010", /* space parity */
617 "\010\040\010", /* odd parity */
618 "\210\240\210", /* even parity */
619 "\210\240\210", /* no parity */
620 };
621
622 /* Initialize kill, erase, parity etc. (also after switching speeds). */
623
624 *cp = init_chardata;
625
626 /* Flush pending input (esp. after parsing or switching the baud rate). */
627
628 (void) sleep(1);
629 (void) ioctl(0, TCFLSH, TCIFLUSH);
630
631 /* Prompt for and read a login name. */
632
633 for (*logname = 0; *logname == 0; /* void */ ) {
634
635 /* Write issue file and prompt, with "parity" bit == 0. */
636
637 do_prompt(op, tp);
638
639 /* Read name, watch for break, parity, erase, kill, end-of-line. */
640
641 for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
642
643 /* Do not report trivial EINTR/EIO errors. */
644
645 if (read(0, &c, 1) < 1) {
646 if (errno == EINTR || errno == EIO)
647 exit(0);
648 error("%s: read: %m", op->tty);
649 }
650 /* Do BREAK handling elsewhere. */
651
652 if ((c == 0) && op->numspeed > 1)
653 /* return (0); */
654 return NULL;
655
656 /* Do parity bit handling. */
657
658 if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
659 for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
660 if (mask & ascval)
661 bits++; /* count "1" bits */
662 cp->parity |= ((bits & 1) ? 1 : 2);
663 }
664 /* Do erase, kill and end-of-line processing. */
665
666 switch (ascval) {
667 case CR:
668 case NL:
669 *bp = 0; /* terminate logname */
670 cp->eol = ascval; /* set end-of-line char */
671 break;
672 case BS:
673 case DEL:
674 case '#':
675 cp->erase = ascval; /* set erase character */
676 if (bp > logname) {
677 (void) write(1, erase[cp->parity], 3);
678 bp--;
679 }
680 break;
681 case CTL('U'):
682 case '@':
683 cp->kill = ascval; /* set kill character */
684 while (bp > logname) {
685 (void) write(1, erase[cp->parity], 3);
686 bp--;
687 }
688 break;
689 case CTL('D'):
690 exit(0);
691 default:
692 if (!isascii(ascval) || !isprint(ascval)) {
693 /* ignore garbage characters */ ;
694 } else if (bp - logname >= sizeof(logname) - 1) {
695 error("%s: input overrun", op->tty);
696 } else {
697 (void) write(1, &c, 1); /* echo the character */
698 *bp++ = ascval; /* and store it */
699 }
700 break;
701 }
702 }
703 }
704 /* Handle names with upper case and no lower case. */
705
706 if ((cp->capslock = caps_lock(logname))) {
707 for (bp = logname; *bp; bp++)
708 if (isupper(*bp))
709 *bp = tolower(*bp); /* map name to lower case */
710 }
711 return (logname);
712}
713
714/* termio_final - set the final tty mode bits */
715static void termio_final(struct options *op, struct termio *tp, struct chardata *cp)
716{
717 /* General terminal-independent stuff. */
718
719 tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
720 tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
721 /* no longer| ECHOCTL | ECHOPRT */
722 tp->c_oflag |= OPOST;
723 /* tp->c_cflag = 0; */
724 tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
725 tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
726 tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
727 tp->c_cc[VEOL] = DEF_EOL;
728 tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
729
730 /* Account for special characters seen in input. */
731
732 if (cp->eol == CR) {
733 tp->c_iflag |= ICRNL; /* map CR in input to NL */
734 tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
735 }
736 tp->c_cc[VERASE] = cp->erase; /* set erase character */
737 tp->c_cc[VKILL] = cp->kill; /* set kill character */
738
739 /* Account for the presence or absence of parity bits in input. */
740
741 switch (cp->parity) {
742 case 0: /* space (always 0) parity */
743 break;
744 case 1: /* odd parity */
745 tp->c_cflag |= PARODD;
746 /* FALLTHROUGH */
747 case 2: /* even parity */
748 tp->c_cflag |= PARENB;
749 tp->c_iflag |= INPCK | ISTRIP;
750 /* FALLTHROUGH */
751 case (1 | 2): /* no parity bit */
752 tp->c_cflag &= ~CSIZE;
753 tp->c_cflag |= CS7;
754 break;
755 }
756 /* Account for upper case without lower case. */
757
758 if (cp->capslock) {
759 tp->c_iflag |= IUCLC;
760 tp->c_lflag |= XCASE;
761 tp->c_oflag |= OLCUC;
762 }
763 /* Optionally enable hardware flow control */
764
765#ifdef CRTSCTS
766 if (op->flags & F_RTSCTS)
767 tp->c_cflag |= CRTSCTS;
768#endif
769
770 /* Finally, make the new settings effective */
771
772 if (ioctl(0, TCSETA, tp) < 0)
773 error("%s: ioctl: TCSETA: %m", op->tty);
774}
775
776
777#ifdef SYSV_STYLE
778#ifdef CONFIG_FEATURE_UTMP
779/* update_utmp - update our utmp entry */
780static void update_utmp(char *line)
781{
782 struct utmp ut;
783 struct utmp *utp;
784 time_t t;
785 int mypid = getpid();
786#if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
787 struct flock lock;
788#endif
789
790 /*
791 * The utmp file holds miscellaneous information about things started by
792 * /sbin/init and other system-related events. Our purpose is to update
793 * the utmp entry for the current process, in particular the process type
794 * and the tty line we are listening to. Return successfully only if the
795 * utmp file can be opened for update, and if we are able to find our
796 * entry in the utmp file.
797 */
798 if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
799 close(creat(_PATH_UTMP, 0664));
800 }
801 utmpname(_PATH_UTMP);
802 setutent();
803 while ((utp = getutent())
804 && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
805 ;
806
807 if (utp) {
808 memcpy(&ut, utp, sizeof(ut));
809 } else {
810 /* some inits don't initialize utmp... */
811 memset(&ut, 0, sizeof(ut));
812 safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
813 }
814 /*endutent(); */
815
816 strcpy(ut.ut_user, "LOGIN");
817 safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
818 if (fakehost)
819 safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
820 time(&t);
821 ut.ut_time = t;
822 ut.ut_type = LOGIN_PROCESS;
823 ut.ut_pid = mypid;
824
825 pututline(&ut);
826 endutent();
827
828#ifdef CONFIG_FEATURE_WTMP
829 if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
830 close(creat(bb_path_wtmp_file, 0664));
831 updwtmp(bb_path_wtmp_file, &ut);
832#endif
833}
834
835#endif /* CONFIG_FEATURE_UTMP */
836#endif /* SYSV_STYLE */
837
838
839#undef logname
840int getty_main(int argc, char **argv)
841{
842 char *logname = NULL; /* login name, given to /bin/login */
843 struct chardata chardata; /* set by get_logname() */
844 struct termio termio; /* terminal mode bits */
845 static struct options options = {
846 0, /* show /etc/issue (SYSV_STYLE) */
847 0, /* no timeout */
848 _PATH_LOGIN, /* default login program */
849 "tty1", /* default tty line */
850 "", /* modem init string */
851#ifdef ISSUE
852 ISSUE, /* default issue file */
853#else
854 NULL,
855#endif
856 0, /* no baud rates known yet */
857 };
858
859#ifdef DEBUGGING
860 dbf = bb_xfopen(DEBUGTERM, "w");
861
862 {
863 int i;
864
865 for (i = 1; i < argc; i++) {
866 debug(argv[i]);
867 debug("\n");
868 }
869 }
870#endif
871
872 /* Parse command-line arguments. */
873
874 parse_args(argc, argv, &options);
875
876#ifdef __linux__
877 setsid();
878#endif
879
880 /* Update the utmp file. */
881
882
883#ifdef SYSV_STYLE
884#ifdef CONFIG_FEATURE_UTMP
885 update_utmp(options.tty);
886#endif
887#endif
888
889 debug("calling open_tty\n");
890 /* Open the tty as standard { input, output, error }. */
891 open_tty(options.tty, &termio, options.flags & F_LOCAL);
892
893#ifdef __linux__
894 {
895 int iv;
896
897 iv = getpid();
898 ioctl(0, TIOCSPGRP, &iv);
899 }
900#endif
901 /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
902 debug("calling termio_init\n");
903 termio_init(&termio, options.speeds[FIRST_SPEED], &options);
904
905 /* write the modem init string and DON'T flush the buffers */
906 if (options.flags & F_INITSTRING) {
907 debug("writing init string\n");
908 write(1, options.initstring, strlen(options.initstring));
909 }
910
911 if (!(options.flags & F_LOCAL)) {
912 /* go to blocking write mode unless -L is specified */
913 fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
914 }
915
916 /* Optionally detect the baud rate from the modem status message. */
917 debug("before autobaud\n");
918 if (options.flags & F_PARSE)
919 auto_baud(&termio);
920
921 /* Set the optional timer. */
922 if (options.timeout)
923 (void) alarm((unsigned) options.timeout);
924
925 /* optionally wait for CR or LF before writing /etc/issue */
926 if (options.flags & F_WAITCRLF) {
927 char ch;
928
929 debug("waiting for cr-lf\n");
930 while (read(0, &ch, 1) == 1) {
931 ch &= 0x7f; /* strip "parity bit" */
932#ifdef DEBUGGING
933 fprintf(dbf, "read %c\n", ch);
934#endif
935 if (ch == '\n' || ch == '\r')
936 break;
937 }
938 }
939
940 chardata = init_chardata;
941 if (!(options.flags & F_NOPROMPT)) {
942 /* Read the login name. */
943 debug("reading login name\n");
944 /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
945 while ((logname = get_logname(&options, &chardata, &termio)) ==
946 NULL) next_speed(&termio, &options);
947 }
948
949 /* Disable timer. */
950
951 if (options.timeout)
952 (void) alarm(0);
953
954 /* Finalize the termio settings. */
955
956 termio_final(&options, &termio, &chardata);
957
958 /* Now the newline character should be properly written. */
959
960 (void) write(1, "\n", 1);
961
962 /* Let the login program take care of password validation. */
963
964 (void) execl(options.login, options.login, "--", logname, (char *) 0);
965 error("%s: can't exec %s: %m", options.tty, options.login);
966}
967
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