source: MondoRescue/branches/stable/mindi-busybox/loginutils/getty.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 12 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 23.2 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 * 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 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
16 *
17 */
18
19#include "libbb.h"
20#include <syslog.h>
21
22#if ENABLE_FEATURE_UTMP
23#include <utmp.h>
24#endif
25
26/*
27 * Some heuristics to find out what environment we are in: if it is not
28 * System V, assume it is SunOS 4.
29 */
30#ifdef LOGIN_PROCESS                    /* defined in System V utmp.h */
31#define SYSV_STYLE                      /* select System V style getty */
32#include <sys/utsname.h>
33#include <time.h>
34#if ENABLE_FEATURE_WTMP
35extern void updwtmp(const char *filename, const struct utmp *ut);
36static void update_utmp(const char *line);
37#endif
38#endif  /* LOGIN_PROCESS */
39
40/*
41 * Things you may want to modify.
42 *
43 * You may disagree with the default line-editing etc. characters defined
44 * below. Note, however, that DEL cannot be used for interrupt generation
45 * and for line editing at the same time.
46 */
47
48/* I doubt there are systems which still need this */
49#undef HANDLE_ALLCAPS
50
51#define _PATH_LOGIN "/bin/login"
52
53/* If ISSUE is not defined, getty will never display the contents of the
54 * /etc/issue file. You will not want to spit out large "issue" files at the
55 * wrong baud rate.
56 */
57#define ISSUE "/etc/issue"              /* displayed before the login prompt */
58
59/* Some shorthands for control characters. */
60#define CTL(x)          (x ^ 0100)      /* Assumes ASCII dialect */
61#define CR              CTL('M')        /* carriage return */
62#define NL              CTL('J')        /* line feed */
63#define BS              CTL('H')        /* back space */
64#define DEL             CTL('?')        /* delete */
65
66/* Defaults for line-editing etc. characters; you may want to change this. */
67#define DEF_ERASE       DEL             /* default erase character */
68#define DEF_INTR        CTL('C')        /* default interrupt character */
69#define DEF_QUIT        CTL('\\')       /* default quit char */
70#define DEF_KILL        CTL('U')        /* default kill char */
71#define DEF_EOF         CTL('D')        /* default EOF char */
72#define DEF_EOL         '\n'
73#define DEF_SWITCH      0               /* default switch char */
74
75/*
76 * When multiple baud rates are specified on the command line, the first one
77 * we will try is the first one specified.
78 */
79#define FIRST_SPEED     0
80
81/* Storage for command-line options. */
82
83#define MAX_SPEED       10              /* max. nr. of baud rates */
84
85struct options {
86    int flags;                      /* toggle switches, see below */
87    unsigned timeout;               /* time-out period */
88    const char *login;                    /* login program */
89    const char *tty;                      /* name of tty */
90    const char *initstring;               /* modem init string */
91    const char *issue;                    /* alternative issue file */
92    int numspeed;                   /* number of baud rates to try */
93    int speeds[MAX_SPEED];          /* baud rates to be tried */
94};
95
96static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
97#define F_INITSTRING    (1<<0)          /* initstring is set */
98#define F_LOCAL         (1<<1)          /* force local */
99#define F_FAKEHOST      (1<<2)          /* force fakehost */
100#define F_CUSTISSUE     (1<<3)          /* give alternative issue file */
101#define F_RTSCTS        (1<<4)          /* enable RTS/CTS flow control */
102#define F_ISSUE         (1<<5)          /* display /etc/issue */
103#define F_LOGIN         (1<<6)          /* non-default login program */
104#define F_PARSE         (1<<7)          /* process modem status messages */
105#define F_TIMEOUT       (1<<8)          /* time out */
106#define F_WAITCRLF      (1<<9)          /* wait for CR or LF */
107#define F_NOPROMPT      (1<<10)         /* don't ask for login name! */
108
109/* Storage for things detected while the login name was read. */
110struct chardata {
111    unsigned char erase;    /* erase character */
112    unsigned char kill;     /* kill character */
113    unsigned char eol;      /* end-of-line character */
114    unsigned char parity;   /* what parity did we see */
115#ifdef HANDLE_ALLCAPS
116    unsigned char capslock; /* upper case without lower case */
117#endif
118};
119
120/* Initial values for the above. */
121static const struct chardata init_chardata = {
122    DEF_ERASE,                              /* default erase character */
123    DEF_KILL,                               /* default kill character */
124    13,                                     /* default eol char */
125    0,                                      /* space parity */
126#ifdef HANDLE_ALLCAPS
127    0,                                      /* no capslock */
128#endif
129};
130
131/* The following is used for understandable diagnostics. */
132
133/* Fake hostname for ut_host specified on command line. */
134static char *fakehost = NULL;
135
136/* ... */
137#ifdef DEBUGGING
138#define debug(s) fprintf(dbf,s); fflush(dbf)
139#define DEBUGTERM "/dev/ttyp0"
140static FILE *dbf;
141#else
142#define debug(s) /* nothing */
143#endif
144
145
146/* bcode - convert speed string to speed code; return 0 on failure */
147static int bcode(const char *s)
148{
149    int r;
150    unsigned value = bb_strtou(s, NULL, 10);
151    if (errno) {
152        return -1;
153    }
154    r = tty_value_to_baud(value);
155    if (r > 0) {
156        return r;
157    }
158    return 0;
159}
160
161
162/* parse_speeds - parse alternate baud rates */
163static void parse_speeds(struct options *op, char *arg)
164{
165    char *cp;
166
167    debug("entered parse_speeds\n");
168    for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
169        if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
170            bb_error_msg_and_die("bad speed: %s", cp);
171        if (op->numspeed > MAX_SPEED)
172            bb_error_msg_and_die("too many alternate speeds");
173    }
174    debug("exiting parsespeeds\n");
175}
176
177
178/* parse_args - parse command-line arguments */
179static void parse_args(int argc, char **argv, struct options *op)
180{
181    char *ts;
182
183    op->flags = getopt32(argv, opt_string,
184        &(op->initstring), &fakehost, &(op->issue),
185        &(op->login), &ts);
186    if (op->flags & F_INITSTRING) {
187        const char *p = op->initstring;
188        char *q;
189
190        op->initstring = q = xstrdup(op->initstring);
191        /* copy optarg into op->initstring decoding \ddd
192           octal codes into chars */
193        while (*p) {
194            if (*p == '\\') {
195                p++;
196                *q++ = bb_process_escape_sequence(&p);
197            } else {
198                *q++ = *p++;
199            }
200        }
201        *q = '\0';
202    }
203    op->flags ^= F_ISSUE;           /* revert flag show /etc/issue */
204    if (op->flags & F_TIMEOUT) {
205        op->timeout = xatoul_range(ts, 1, INT_MAX);
206    }
207    argv += optind;
208    argc -= optind;
209    debug("after getopt loop\n");
210    if (argc < 2)          /* check parameter count */
211        bb_show_usage();
212
213    /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
214    if (isdigit(argv[0][0])) {
215        /* a number first, assume it's a speed (BSD style) */
216        parse_speeds(op, argv[0]);       /* baud rate(s) */
217        op->tty = argv[1]; /* tty name */
218    } else {
219        op->tty = argv[0];       /* tty name */
220        parse_speeds(op, argv[1]); /* baud rate(s) */
221    }
222
223    if (argv[2])
224        setenv("TERM", argv[2], 1);
225
226    debug("exiting parseargs\n");
227}
228
229/* open_tty - set up tty as standard { input, output, error } */
230static void open_tty(const char *tty, struct termios *tp, int local)
231{
232    int chdir_to_root = 0;
233
234    /* Set up new standard input, unless we are given an already opened port. */
235    if (NOT_LONE_DASH(tty)) {
236        struct stat st;
237        int fd;
238
239        /* Sanity checks... */
240        xchdir("/dev");
241        chdir_to_root = 1;
242        xstat(tty, &st);
243        if ((st.st_mode & S_IFMT) != S_IFCHR)
244            bb_error_msg_and_die("%s: not a character device", tty);
245
246        /* Open the tty as standard input. */
247        debug("open(2)\n");
248        fd = xopen(tty, O_RDWR | O_NONBLOCK);
249        xdup2(fd, 0);
250        while (fd > 2)
251            close(fd--);
252    } else {
253        /*
254         * Standard input should already be connected to an open port. Make
255         * sure it is open for read/write.
256         */
257        if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
258            bb_error_msg_and_die("stdin is not open for read/write");
259    }
260
261    /* Replace current standard output/error fd's with new ones */
262    debug("duping\n");
263    xdup2(0, 1);
264    xdup2(0, 2);
265
266    /*
267     * The following ioctl will fail if stdin is not a tty, but also when
268     * there is noise on the modem control lines. In the latter case, the
269     * common course of action is (1) fix your cables (2) give the modem more
270     * time to properly reset after hanging up. SunOS users can achieve (2)
271     * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
272     * 5 seconds seems to be a good value.
273     */
274    ioctl_or_perror_and_die(0, TCGETS, tp, "%s: TCGETS", tty);
275
276    /*
277     * It seems to be a terminal. Set proper protections and ownership. Mode
278     * 0622 is suitable for SYSV <4 because /bin/login does not change
279     * protections. SunOS 4 login will change the protections to 0620 (write
280     * access for group tty) after the login has succeeded.
281     */
282
283#ifdef DEBIAN
284#warning Debian /dev/vcs[a]NN hack is deprecated and will be removed
285    {
286        /* tty to root.dialout 660 */
287        struct group *gr;
288        int id;
289
290        gr = getgrnam("dialout");
291        id = gr ? gr->gr_gid : 0;
292        chown(tty, 0, id);
293        chmod(tty, 0660);
294
295        /* vcs,vcsa to root.sys 600 */
296        if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
297            char *vcs, *vcsa;
298
299            vcs = xstrdup(tty);
300            vcsa = xmalloc(strlen(tty) + 2);
301            strcpy(vcs, "vcs");
302            strcpy(vcs + 3, tty + 3);
303            strcpy(vcsa, "vcsa");
304            strcpy(vcsa + 4, tty + 3);
305
306            gr = getgrnam("sys");
307            id = gr ? gr->gr_gid : 0;
308            chown(vcs, 0, id);
309            chmod(vcs, 0600);
310            chown(vcsa, 0, id);
311            chmod(vcs, 0600);
312
313            free(vcs);
314            free(vcsa);
315        }
316    }
317#else
318    if (NOT_LONE_DASH(tty)) {
319        chown(tty, 0, 0);        /* 0:0 */
320        chmod(tty, 0622);        /* crw--w--w- */
321    }
322#endif
323    if (chdir_to_root)
324        xchdir("/");
325}
326
327/* termios_init - initialize termios settings */
328static void termios_init(struct termios *tp, int speed, struct options *op)
329{
330    /*
331     * Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
332     * Special characters are set after we have read the login name; all
333     * reads will be done in raw mode anyway. Errors will be dealt with
334     * later on.
335     */
336#ifdef __linux__
337    /* flush input and output queues, important for modems! */
338    ioctl(0, TCFLSH, TCIOFLUSH);
339#endif
340
341    tp->c_cflag = CS8 | HUPCL | CREAD | speed;
342    if (op->flags & F_LOCAL) {
343        tp->c_cflag |= CLOCAL;
344    }
345
346    tp->c_iflag = tp->c_lflag = tp->c_line = 0;
347    tp->c_oflag = OPOST | ONLCR;
348    tp->c_cc[VMIN] = 1;
349    tp->c_cc[VTIME] = 0;
350
351    /* Optionally enable hardware flow control */
352
353#ifdef  CRTSCTS
354    if (op->flags & F_RTSCTS)
355        tp->c_cflag |= CRTSCTS;
356#endif
357
358    ioctl(0, TCSETS, tp);
359
360    /* go to blocking input even in local mode */
361    ndelay_off(0);
362
363    debug("term_io 2\n");
364}
365
366/* auto_baud - extract baud rate from modem status message */
367static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
368{
369    int speed;
370    int vmin;
371    unsigned iflag;
372    char *bp;
373    int nread;
374
375    /*
376     * This works only if the modem produces its status code AFTER raising
377     * the DCD line, and if the computer is fast enough to set the proper
378     * baud rate before the message has gone by. We expect a message of the
379     * following format:
380     *
381     * <junk><number><junk>
382     *
383     * The number is interpreted as the baud rate of the incoming call. If the
384     * modem does not tell us the baud rate within one second, we will keep
385     * using the current baud rate. It is advisable to enable BREAK
386     * processing (comma-separated list of baud rates) if the processing of
387     * modem status messages is enabled.
388     */
389
390    /*
391     * Use 7-bit characters, don't block if input queue is empty. Errors will
392     * be dealt with later on.
393     */
394
395    iflag = tp->c_iflag;
396    tp->c_iflag |= ISTRIP;          /* enable 8th-bit stripping */
397    vmin = tp->c_cc[VMIN];
398    tp->c_cc[VMIN] = 0;                     /* don't block if queue empty */
399    ioctl(0, TCSETS, tp);
400
401    /*
402     * Wait for a while, then read everything the modem has said so far and
403     * try to extract the speed of the dial-in call.
404     */
405
406    sleep(1);
407    nread = read(0, buf, size_buf - 1);
408    if (nread > 0) {
409        buf[nread] = '\0';
410        for (bp = buf; bp < buf + nread; bp++) {
411            if (isascii(*bp) && isdigit(*bp)) {
412                speed = bcode(bp);
413                if (speed) {
414                    tp->c_cflag &= ~CBAUD;
415                    tp->c_cflag |= speed;
416                }
417                break;
418            }
419        }
420    }
421    /* Restore terminal settings. Errors will be dealt with later on. */
422
423    tp->c_iflag = iflag;
424    tp->c_cc[VMIN] = vmin;
425    ioctl(0, TCSETS, tp);
426}
427
428/* next_speed - select next baud rate */
429static void next_speed(struct termios *tp, struct options *op)
430{
431    static int baud_index = FIRST_SPEED;    /* current speed index */
432
433    baud_index = (baud_index + 1) % op->numspeed;
434    tp->c_cflag &= ~CBAUD;
435    tp->c_cflag |= op->speeds[baud_index];
436    ioctl(0, TCSETS, tp);
437}
438
439
440/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
441static void do_prompt(struct options *op, struct termios *tp)
442{
443#ifdef ISSUE
444    print_login_issue(op->issue, op->tty);
445#endif
446    print_login_prompt();
447}
448
449#ifdef HANDLE_ALLCAPS
450/* caps_lock - string contains upper case without lower case */
451/* returns 1 if true, 0 if false */
452static int caps_lock(const char *s)
453{
454    while (*s)
455        if (islower(*s++))
456            return 0;
457    return 1;
458}
459#endif
460
461/* get_logname - get user name, establish parity, speed, erase, kill, eol */
462/* return NULL on failure, logname on success */
463static char *get_logname(char *logname, unsigned size_logname,
464        struct options *op, struct chardata *cp, struct termios *tp)
465{
466    char *bp;
467    char c;             /* input character, full eight bits */
468    char ascval;                    /* low 7 bits of input character */
469    int bits;                       /* # of "1" bits per character */
470    int mask;                       /* mask with 1 bit up */
471    static const char erase[][3] = {    /* backspace-space-backspace */
472        "\010\040\010",                 /* space parity */
473        "\010\040\010",                 /* odd parity */
474        "\210\240\210",                 /* even parity */
475        "\210\240\210",                 /* no parity */
476    };
477
478    /* Initialize kill, erase, parity etc. (also after switching speeds). */
479
480    *cp = init_chardata;
481
482    /* Flush pending input (esp. after parsing or switching the baud rate). */
483
484    sleep(1);
485    ioctl(0, TCFLSH, TCIFLUSH);
486
487    /* Prompt for and read a login name. */
488
489    logname[0] = '\0';
490    while (!logname[0]) {
491
492        /* Write issue file and prompt, with "parity" bit == 0. */
493
494        do_prompt(op, tp);
495
496        /* Read name, watch for break, parity, erase, kill, end-of-line. */
497
498        bp = logname;
499        cp->eol = '\0';
500        while (cp->eol == '\0') {
501
502            /* Do not report trivial EINTR/EIO errors. */
503            if (read(0, &c, 1) < 1) {
504                if (errno == EINTR || errno == EIO)
505                    exit(0);
506                bb_perror_msg_and_die("%s: read", op->tty);
507            }
508
509            /* Do BREAK handling elsewhere. */
510            if (c == '\0' && op->numspeed > 1)
511                return NULL;
512
513            /* Do parity bit handling. */
514            ascval = c & 0177;
515            if (c != ascval) {       /* "parity" bit on ? */
516                bits = 1;
517                mask = 1;
518                while (mask & 0177) {
519                    if (mask & ascval)
520                        bits++; /* count "1" bits */
521                    mask <<= 1;
522                }
523                /* ... |= 2 - even, 1 - odd */
524                cp->parity |= 2 - (bits & 1);
525            }
526
527            /* Do erase, kill and end-of-line processing. */
528            switch (ascval) {
529            case CR:
530            case NL:
531                *bp = '\0';             /* terminate logname */
532                cp->eol = ascval;       /* set end-of-line char */
533                break;
534            case BS:
535            case DEL:
536            case '#':
537                cp->erase = ascval;     /* set erase character */
538                if (bp > logname) {
539                    write(1, erase[cp->parity], 3);
540                    bp--;
541                }
542                break;
543            case CTL('U'):
544            case '@':
545                cp->kill = ascval;      /* set kill character */
546                while (bp > logname) {
547                    write(1, erase[cp->parity], 3);
548                    bp--;
549                }
550                break;
551            case CTL('D'):
552                exit(0);
553            default:
554                if (!isascii(ascval) || !isprint(ascval)) {
555                    /* ignore garbage characters */
556                } else if (bp - logname >= size_logname - 1) {
557                    bb_error_msg_and_die("%s: input overrun", op->tty);
558                } else {
559                    write(1, &c, 1); /* echo the character */
560                    *bp++ = ascval; /* and store it */
561                }
562                break;
563            }
564        }
565    }
566    /* Handle names with upper case and no lower case. */
567
568#ifdef HANDLE_ALLCAPS
569    cp->capslock = caps_lock(logname);
570    if (cp->capslock) {
571        for (bp = logname; *bp; bp++)
572            if (isupper(*bp))
573                *bp = tolower(*bp);     /* map name to lower case */
574    }
575#endif
576    return logname;
577}
578
579/* termios_final - set the final tty mode bits */
580static void termios_final(struct options *op, struct termios *tp, struct chardata *cp)
581{
582    /* General terminal-independent stuff. */
583
584    tp->c_iflag |= IXON | IXOFF;    /* 2-way flow control */
585    tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
586    /* no longer| ECHOCTL | ECHOPRT */
587    tp->c_oflag |= OPOST;
588    /* tp->c_cflag = 0; */
589    tp->c_cc[VINTR] = DEF_INTR;     /* default interrupt */
590    tp->c_cc[VQUIT] = DEF_QUIT;     /* default quit */
591    tp->c_cc[VEOF] = DEF_EOF;       /* default EOF character */
592    tp->c_cc[VEOL] = DEF_EOL;
593    tp->c_cc[VSWTC] = DEF_SWITCH;   /* default switch character */
594
595    /* Account for special characters seen in input. */
596
597    if (cp->eol == CR) {
598        tp->c_iflag |= ICRNL;   /* map CR in input to NL */
599        tp->c_oflag |= ONLCR;   /* map NL in output to CR-NL */
600    }
601    tp->c_cc[VERASE] = cp->erase;   /* set erase character */
602    tp->c_cc[VKILL] = cp->kill;     /* set kill character */
603
604    /* Account for the presence or absence of parity bits in input. */
605
606    switch (cp->parity) {
607    case 0:                                 /* space (always 0) parity */
608        break;
609    case 1:                                 /* odd parity */
610        tp->c_cflag |= PARODD;
611        /* FALLTHROUGH */
612    case 2:                                 /* even parity */
613        tp->c_cflag |= PARENB;
614        tp->c_iflag |= INPCK | ISTRIP;
615        /* FALLTHROUGH */
616    case (1 | 2):                           /* no parity bit */
617        tp->c_cflag &= ~CSIZE;
618        tp->c_cflag |= CS7;
619        break;
620    }
621
622    /* Account for upper case without lower case. */
623#ifdef HANDLE_ALLCAPS
624    if (cp->capslock) {
625        tp->c_iflag |= IUCLC;
626        tp->c_lflag |= XCASE;
627        tp->c_oflag |= OLCUC;
628    }
629#endif
630    /* Optionally enable hardware flow control */
631
632#ifdef  CRTSCTS
633    if (op->flags & F_RTSCTS)
634        tp->c_cflag |= CRTSCTS;
635#endif
636
637    /* Finally, make the new settings effective */
638
639    ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
640}
641
642
643#ifdef SYSV_STYLE
644#if ENABLE_FEATURE_UTMP
645/* update_utmp - update our utmp entry */
646static void update_utmp(const char *line)
647{
648    struct utmp ut;
649    struct utmp *utp;
650    time_t t;
651    int mypid = getpid();
652
653    /*
654     * The utmp file holds miscellaneous information about things started by
655     * /sbin/init and other system-related events. Our purpose is to update
656     * the utmp entry for the current process, in particular the process type
657     * and the tty line we are listening to. Return successfully only if the
658     * utmp file can be opened for update, and if we are able to find our
659     * entry in the utmp file.
660     */
661    if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
662        close(creat(_PATH_UTMP, 0664));
663    }
664    utmpname(_PATH_UTMP);
665    setutent();
666    while ((utp = getutent())
667           && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid))
668        /* nothing */;
669
670    if (utp) {
671        memcpy(&ut, utp, sizeof(ut));
672    } else {
673        /* some inits don't initialize utmp... */
674        memset(&ut, 0, sizeof(ut));
675        safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
676    }
677    /* endutent(); */
678
679    strcpy(ut.ut_user, "LOGIN");
680    safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
681    if (fakehost)
682        safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
683    time(&t);
684    ut.ut_time = t;
685    ut.ut_type = LOGIN_PROCESS;
686    ut.ut_pid = mypid;
687
688    pututline(&ut);
689    endutent();
690
691#if ENABLE_FEATURE_WTMP
692    if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
693        close(creat(bb_path_wtmp_file, 0664));
694    updwtmp(bb_path_wtmp_file, &ut);
695#endif
696}
697
698#endif /* CONFIG_FEATURE_UTMP */
699#endif /* SYSV_STYLE */
700
701
702int getty_main(int argc, char **argv);
703int getty_main(int argc, char **argv)
704{
705    int nullfd;
706    char *logname = NULL;           /* login name, given to /bin/login */
707    /* Merging these into "struct local" may _seem_ to reduce
708     * parameter passing, but today's gcc will inline
709     * statics which are called once anyway, so don't do that */
710    struct chardata chardata;       /* set by get_logname() */
711    struct termios termios;           /* terminal mode bits */
712    struct options options = {
713        0,                      /* show /etc/issue (SYSV_STYLE) */
714        0,                      /* no timeout */
715        _PATH_LOGIN,            /* default login program */
716        "tty1",                 /* default tty line */
717        "",                     /* modem init string */
718#ifdef ISSUE
719        ISSUE,                  /* default issue file */
720#else
721        NULL,
722#endif
723        0,                      /* no baud rates known yet */
724    };
725
726    /* Already too late because of theoretical
727     * possibility of getty --help somehow triggered
728     * inadvertently before we reach this. Oh well. */
729    logmode = LOGMODE_NONE;
730    setsid();
731    nullfd = xopen(bb_dev_null, O_RDWR);
732    /* dup2(nullfd, 0); - no, because of possible "getty - 9600" */
733    /* open_tty() will take care of fd# 0 anyway */
734    dup2(nullfd, 1);
735    dup2(nullfd, 2);
736    while (nullfd > 2) close(nullfd--);
737    /* We want special flavor of error_msg_and_die */
738    die_sleep = 10;
739    msg_eol = "\r\n";
740    openlog(applet_name, LOG_PID, LOG_AUTH);
741    logmode = LOGMODE_BOTH;
742
743#ifdef DEBUGGING
744    dbf = xfopen(DEBUGTERM, "w");
745
746    {
747        int i;
748
749        for (i = 1; i < argc; i++) {
750            debug(argv[i]);
751            debug("\n");
752        }
753    }
754#endif
755
756    /* Parse command-line arguments. */
757    parse_args(argc, argv, &options);
758
759#ifdef SYSV_STYLE
760#if ENABLE_FEATURE_UTMP
761    /* Update the utmp file. */
762    update_utmp(options.tty);
763#endif
764#endif
765
766    debug("calling open_tty\n");
767    /* Open the tty as standard { input, output, error }. */
768    open_tty(options.tty, &termios, options.flags & F_LOCAL);
769
770#ifdef __linux__
771    {
772        int iv;
773
774        iv = getpid();
775        ioctl(0, TIOCSPGRP, &iv);
776    }
777#endif
778    /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
779    debug("calling termios_init\n");
780    termios_init(&termios, options.speeds[FIRST_SPEED], &options);
781
782    /* write the modem init string and DON'T flush the buffers */
783    if (options.flags & F_INITSTRING) {
784        debug("writing init string\n");
785        write(1, options.initstring, strlen(options.initstring));
786    }
787
788    if (!(options.flags & F_LOCAL)) {
789        /* go to blocking write mode unless -L is specified */
790        ndelay_off(1);
791    }
792
793    /* Optionally detect the baud rate from the modem status message. */
794    debug("before autobaud\n");
795    if (options.flags & F_PARSE)
796        auto_baud(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termios);
797
798    /* Set the optional timer. */
799    if (options.timeout)
800        alarm(options.timeout);
801
802    /* optionally wait for CR or LF before writing /etc/issue */
803    if (options.flags & F_WAITCRLF) {
804        char ch;
805
806        debug("waiting for cr-lf\n");
807        while (read(0, &ch, 1) == 1) {
808            ch &= 0x7f;                     /* strip "parity bit" */
809#ifdef DEBUGGING
810            fprintf(dbf, "read %c\n", ch);
811#endif
812            if (ch == '\n' || ch == '\r')
813                break;
814        }
815    }
816
817    chardata = init_chardata;
818    if (!(options.flags & F_NOPROMPT)) {
819        /* Read the login name. */
820        debug("reading login name\n");
821        logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
822                &options, &chardata, &termios);
823        while (logname == NULL)
824            next_speed(&termios, &options);
825    }
826
827    /* Disable timer. */
828
829    if (options.timeout)
830        alarm(0);
831
832    /* Finalize the termios settings. */
833
834    termios_final(&options, &termios, &chardata);
835
836    /* Now the newline character should be properly written. */
837
838    write(1, "\n", 1);
839
840    /* Let the login program take care of password validation. */
841
842    execl(options.login, options.login, "--", logname, (char *) 0);
843    bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login);
844}
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