busybox/loginutils/getty.c

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/* vi: set sw=4 ts=4: */
/*
* Based on agetty - another getty program for Linux. By W. Z. Venema 1989
* Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
* This program is freely distributable.
*
* option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
*
* 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
* - Added Native Language Support
*
* 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
* - Enabled hardware flow control before displaying /etc/issue
*
* 2011-01 Venys Vlasenko
* - Removed parity detection code. It can't work reliably:
* if all chars received have bit 7 cleared and odd (or even) parity,
* it is impossible to determine whether other side is 8-bit,no-parity
* or 7-bit,odd(even)-parity. It also interferes with non-ASCII usernames.
* - From now on, we assume that parity is correctly set.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config GETTY
//config: bool "getty (10 kb)"
//config: default y
//config: select FEATURE_SYSLOG
//config: help
//config: getty lets you log in on a tty. It is normally invoked by init.
//config:
//config: Note that you can save a few bytes by disabling it and
//config: using login applet directly.
//config: If you need to reset tty attributes before calling login,
//config: this script approximates getty:
//config:
//config: exec </dev/$1 >/dev/$1 2>&1 || exit 1
//config: reset
//config: stty sane; stty ispeed 38400; stty ospeed 38400
//config: printf "%s login: " "`hostname`"
//config: read -r login
//config: exec /bin/login "$login"
//applet:IF_GETTY(APPLET(getty, BB_DIR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_GETTY) += getty.o
#include "libbb.h"
2006-09-19 19:20:55 +05:30
#include <syslog.h>
#ifndef IUCLC
# define IUCLC 0
#endif
#ifndef LOGIN_PROCESS
# undef ENABLE_FEATURE_UTMP
# undef ENABLE_FEATURE_WTMP
# define ENABLE_FEATURE_UTMP 0
# define ENABLE_FEATURE_WTMP 0
#endif
2006-10-23 07:41:22 +05:30
/* The following is used for understandable diagnostics */
#ifdef DEBUGGING
static FILE *dbf;
# define DEBUGTERM "/dev/ttyp0"
# define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0)
#else
# define debug(...) ((void)0)
#endif
/*
* Things you may want to modify.
*
* You may disagree with the default line-editing etc. characters defined
* below. Note, however, that DEL cannot be used for interrupt generation
* and for line editing at the same time.
*/
#undef _PATH_LOGIN
#define _PATH_LOGIN "/bin/login"
/* Displayed before the login prompt.
* If ISSUE is not defined, getty will never display the contents of the
* /etc/issue file. You will not want to spit out large "issue" files at the
* wrong baud rate.
*/
#define ISSUE "/etc/issue"
/* Macro to build Ctrl-LETTER. Assumes ASCII dialect */
#define CTL(x) ((x) ^ 0100)
/*
* When multiple baud rates are specified on the command line,
* the first one we will try is the first one specified.
*/
#define MAX_SPEED 10 /* max. nr. of baud rates */
struct globals {
unsigned timeout;
const char *login; /* login program */
const char *fakehost;
const char *tty_name;
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 */
unsigned char eol; /* end-of-line char seen (CR or NL) */
struct termios tty_attrs;
char line_buf[128];
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
//usage:#define getty_trivial_usage
//usage: "[OPTIONS] BAUD_RATE[,BAUD_RATE]... TTY [TERMTYPE]"
//usage:#define getty_full_usage "\n\n"
//usage: "Open TTY, prompt for login name, then invoke /bin/login\n"
//usage: "\n -h Enable hardware RTS/CTS flow control"
//usage: "\n -L Set CLOCAL (ignore Carrier Detect state)"
//usage: "\n -m Get baud rate from modem's CONNECT status message"
//usage: "\n -n Don't prompt for login name"
//usage: "\n -w Wait for CR or LF before sending /etc/issue"
//usage: "\n -i Don't display /etc/issue"
//usage: "\n -f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue"
//usage: "\n -l LOGIN Invoke LOGIN instead of /bin/login"
//usage: "\n -t SEC Terminate after SEC if no login name is read"
//usage: "\n -I INITSTR Send INITSTR before anything else"
//usage: "\n -H HOST Log HOST into the utmp file as the hostname"
//usage: "\n"
//usage: "\nBAUD_RATE of 0 leaves it unchanged"
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
#define OPT_STR "I:LH:f:hil:mt:+wn"
#define F_INITSTRING (1 << 0) /* -I */
#define F_LOCAL (1 << 1) /* -L */
#define F_FAKEHOST (1 << 2) /* -H */
#define F_CUSTISSUE (1 << 3) /* -f */
#define F_RTSCTS (1 << 4) /* -h */
#define F_NOISSUE (1 << 5) /* -i */
#define F_LOGIN (1 << 6) /* -l */
#define F_PARSE (1 << 7) /* -m */
#define F_TIMEOUT (1 << 8) /* -t */
#define F_WAITCRLF (1 << 9) /* -w */
#define F_NOPROMPT (1 << 10) /* -n */
/* convert speed string to speed code; return <= 0 on failure */
static int bcode(const char *s)
{
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 alternate baud rates */
static void parse_speeds(char *arg)
{
char *cp;
/* NB: at least one iteration is always done */
debug("entered parse_speeds\n");
while ((cp = strsep(&arg, ",")) != NULL) {
G.speeds[G.numspeed] = bcode(cp);
if (G.speeds[G.numspeed] < 0)
bb_error_msg_and_die("bad speed: %s", cp);
/* note: arg "0" turns into speed B0 */
G.numspeed++;
if (G.numspeed > MAX_SPEED)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_error_msg_and_die("too many alternate speeds");
}
debug("exiting parse_speeds\n");
}
/* parse command-line arguments */
static void parse_args(char **argv)
{
char *ts;
int flags;
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
flags = getopt32(argv, "^" OPT_STR "\0" "-2"/* at least 2 args*/,
&G.initstring, &G.fakehost, &G.issue,
&G.login, &G.timeout
);
if (flags & F_INITSTRING) {
G.initstring = xstrdup(G.initstring);
/* decode \ddd octal codes into chars */
strcpy_and_process_escape_sequences(G.initstring, G.initstring);
}
argv += optind;
debug("after getopt\n");
/* We loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
G.tty_name = argv[0];
ts = argv[1]; /* baud rate(s) */
if (isdigit(argv[0][0])) {
/* A number first, assume it's a speed (BSD style) */
G.tty_name = ts; /* tty name is in argv[1] */
ts = argv[0]; /* baud rate(s) */
}
parse_speeds(ts);
2006-10-23 07:41:22 +05:30
if (argv[2])
xsetenv("TERM", argv[2]);
debug("exiting parse_args\n");
}
/* set up tty as standard input, output, error */
static void open_tty(void)
{
/* Set up new standard input, unless we are given an already opened port */
if (NOT_LONE_DASH(G.tty_name)) {
if (G.tty_name[0] != '/')
G.tty_name = xasprintf("/dev/%s", G.tty_name); /* will leak it */
/* Open the tty as standard input */
debug("open(2)\n");
close(0);
xopen(G.tty_name, O_RDWR | O_NONBLOCK); /* uses fd 0 */
/* Set proper protections and ownership */
fchown(0, 0, 0); /* 0:0 */
fchmod(0, 0620); /* crw--w---- */
} else {
char *n;
/*
* Standard input should already be connected to an open port.
* Make sure it is open for read/write.
*/
if ((fcntl(0, F_GETFL) & (O_RDWR|O_RDONLY|O_WRONLY)) != O_RDWR)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_error_msg_and_die("stdin is not open for read/write");
/* Try to get real tty name instead of "-" */
n = xmalloc_ttyname(0);
if (n)
G.tty_name = n;
}
applet_name = xasprintf("getty: %s", skip_dev_pfx(G.tty_name));
}
static void set_tty_attrs(void)
{
if (tcsetattr_stdin_TCSANOW(&G.tty_attrs) < 0)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die("tcsetattr");
}
/* We manipulate tty_attrs this way:
* - first, we read existing tty_attrs
* - init_tty_attrs modifies some parts and sets it
* - auto_baud and/or BREAK processing can set different speed and set tty attrs
* - finalize_tty_attrs again modifies some parts and sets tty attrs before
* execing login
*/
static void init_tty_attrs(int speed)
{
/* Try to drain output buffer, with 5 sec timeout.
* Added on request from users of ~600 baud serial interface
* with biggish buffer on a 90MHz CPU.
* They were losing hundreds of bytes of buffered output
* on tcflush.
*/
signal_no_SA_RESTART_empty_mask(SIGALRM, record_signo);
alarm(5);
tcdrain(STDIN_FILENO);
alarm(0);
/* Flush input and output queues, important for modems! */
tcflush(STDIN_FILENO, TCIOFLUSH);
/* Set speed if it wasn't specified as "0" on command line */
if (speed != B0)
cfsetspeed(&G.tty_attrs, speed);
/* Initial settings: 8-bit characters, raw mode, blocking i/o.
* Special characters are set after we have read the login name; all
* reads will be done in raw mode anyway.
*/
/* Clear all bits except: */
G.tty_attrs.c_cflag &= (0
/* 2 stop bits (1 otherwise)
* Enable parity bit (both on input and output)
* Odd parity (else even)
*/
| CSTOPB | PARENB | PARODD
#ifdef CMSPAR
| CMSPAR /* mark or space parity */
#endif
#ifdef CBAUD
| CBAUD /* (output) baud rate */
#endif
#ifdef CBAUDEX
| CBAUDEX /* (output) baud rate */
#endif
#ifdef CIBAUD
| CIBAUD /* input baud rate */
#endif
);
/* Set: 8 bits; hang up (drop DTR) on last close; enable receive */
G.tty_attrs.c_cflag |= CS8 | HUPCL | CREAD;
if (option_mask32 & F_LOCAL) {
/* ignore Carrier Detect pin:
* opens don't block when CD is low,
* losing CD doesn't hang up processes whose ctty is this tty
*/
G.tty_attrs.c_cflag |= CLOCAL;
}
#ifdef CRTSCTS
if (option_mask32 & F_RTSCTS)
G.tty_attrs.c_cflag |= CRTSCTS; /* flow control using RTS/CTS pins */
#endif
G.tty_attrs.c_iflag = 0;
G.tty_attrs.c_lflag = 0;
/* non-raw output; add CR to each NL */
G.tty_attrs.c_oflag = OPOST | ONLCR;
/* reads will block only if < 1 char is available */
G.tty_attrs.c_cc[VMIN] = 1;
/* no timeout (reads block forever) */
G.tty_attrs.c_cc[VTIME] = 0;
#ifdef __linux__
G.tty_attrs.c_line = 0;
#endif
set_tty_attrs();
debug("term_io 2\n");
}
static void finalize_tty_attrs(void)
{
/* software flow control on output (stop sending if XOFF is recvd);
* and on input (send XOFF when buffer is full)
*/
G.tty_attrs.c_iflag |= IXON | IXOFF;
if (G.eol == '\r') {
G.tty_attrs.c_iflag |= ICRNL; /* map CR on input to NL */
}
/* Other bits in c_iflag:
* IXANY Any recvd char enables output (any char is also a XON)
* INPCK Enable parity check
* IGNPAR Ignore parity errors (drop bad bytes)
* PARMRK Mark parity errors with 0xff, 0x00 prefix
* (else bad byte is received as 0x00)
* ISTRIP Strip parity bit
* IGNBRK Ignore break condition
* BRKINT Send SIGINT on break - maybe set this?
* INLCR Map NL to CR
* IGNCR Ignore CR
* ICRNL Map CR to NL
* IUCLC Map uppercase to lowercase
* IMAXBEL Echo BEL on input line too long
* IUTF8 Appears to affect tty's idea of char widths,
* observed to improve backspacing through Unicode chars
*/
/* ICANON line buffered input (NL or EOL or EOF chars end a line);
* ISIG recognize INT/QUIT/SUSP chars;
* ECHO echo input chars;
* ECHOE echo BS-SP-BS on erase character;
* ECHOK echo kill char specially, not as ^c (ECHOKE controls how exactly);
* ECHOKE erase all input via BS-SP-BS on kill char (else go to next line)
* ECHOCTL Echo ctrl chars as ^c (else echo verbatim:
* e.g. up arrow emits "ESC-something" and thus moves cursor up!)
*/
G.tty_attrs.c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE | ECHOCTL;
/* Other bits in c_lflag:
* XCASE Map uppercase to \lowercase [tried, doesn't work]
* ECHONL Echo NL even if ECHO is not set
* ECHOPRT On erase, echo erased chars
* [qwe<BS><BS><BS> input looks like "qwe\ewq/" on screen]
* NOFLSH Don't flush input buffer after interrupt or quit chars
* IEXTEN Enable extended functions (??)
* [glibc says it enables c_cc[LNEXT] "enter literal char"
* and c_cc[VDISCARD] "toggle discard buffered output" chars]
* FLUSHO Output being flushed (c_cc[VDISCARD] is in effect)
* PENDIN Retype pending input at next read or input char
* (c_cc[VREPRINT] is being processed)
* TOSTOP Send SIGTTOU for background output
* (why "stty sane" unsets this bit?)
*/
G.tty_attrs.c_cc[VINTR] = CTL('C');
G.tty_attrs.c_cc[VQUIT] = CTL('\\');
G.tty_attrs.c_cc[VEOF] = CTL('D');
G.tty_attrs.c_cc[VEOL] = '\n';
#ifdef VSWTC
G.tty_attrs.c_cc[VSWTC] = 0;
#endif
#ifdef VSWTCH
G.tty_attrs.c_cc[VSWTCH] = 0;
#endif
G.tty_attrs.c_cc[VKILL] = CTL('U');
/* Other control chars:
* VEOL2
* VERASE, VWERASE - (word) erase. we may set VERASE in get_logname
* VREPRINT - reprint current input buffer
* VLNEXT, VDISCARD, VSTATUS
* VSUSP, VDSUSP - send (delayed) SIGTSTP
* VSTART, VSTOP - chars used for IXON/IXOFF
*/
set_tty_attrs();
/* Now the newline character should be properly written */
full_write(STDOUT_FILENO, "\n", 1);
}
/* extract baud rate from modem status message */
static void auto_baud(void)
{
int nread;
/*
* This works only if the modem produces its status code AFTER raising
* the DCD line, and if the computer is fast enough to set the proper
* baud rate before the message has gone by. We expect a message of the
* following format:
*
* <junk><number><junk>
*
* The number is interpreted as the baud rate of the incoming call. If the
* modem does not tell us the baud rate within one second, we will keep
* using the current baud rate. It is advisable to enable BREAK
* processing (comma-separated list of baud rates) if the processing of
* modem status messages is enabled.
*/
G.tty_attrs.c_cc[VMIN] = 0; /* don't block reads (min read is 0 chars) */
set_tty_attrs();
/*
* Wait for a while, then read everything the modem has said so far and
* try to extract the speed of the dial-in call.
*/
2006-10-23 07:41:22 +05:30
sleep(1);
nread = safe_read(STDIN_FILENO, G.line_buf, sizeof(G.line_buf) - 1);
2006-10-23 07:40:45 +05:30
if (nread > 0) {
int speed;
char *bp;
G.line_buf[nread] = '\0';
for (bp = G.line_buf; bp < G.line_buf + nread; bp++) {
if (isdigit(*bp)) {
2006-10-08 18:19:22 +05:30
speed = bcode(bp);
if (speed > 0)
cfsetspeed(&G.tty_attrs, speed);
break;
}
}
}
/* Restore terminal settings */
G.tty_attrs.c_cc[VMIN] = 1; /* restore to value set by init_tty_attrs */
set_tty_attrs();
}
/* get user name, establish parity, speed, erase, kill, eol;
* return NULL on BREAK, logname on success
*/
static char *get_logname(void)
{
char *bp;
char c;
/* Flush pending input (esp. after parsing or switching the baud rate) */
usleep(100*1000); /* 0.1 sec */
tcflush(STDIN_FILENO, TCIFLUSH);
/* Prompt for and read a login name */
do {
/* Write issue file and prompt */
#ifdef ISSUE
if (!(option_mask32 & F_NOISSUE))
print_login_issue(G.issue, G.tty_name);
#endif
print_login_prompt();
/* Read name, watch for break, erase, kill, end-of-line */
bp = G.line_buf;
while (1) {
/* Do not report trivial EINTR/EIO errors */
errno = EINTR; /* make read of 0 bytes be silent too */
if (read(STDIN_FILENO, &c, 1) < 1) {
finalize_tty_attrs();
if (errno == EINTR || errno == EIO)
exit(EXIT_SUCCESS);
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die(bb_msg_read_error);
}
switch (c) {
case '\r':
case '\n':
*bp = '\0';
G.eol = c;
goto got_logname;
case CTL('H'):
case 0x7f:
G.tty_attrs.c_cc[VERASE] = c;
if (bp > G.line_buf) {
full_write(STDOUT_FILENO, "\010 \010", 3);
bp--;
}
break;
case CTL('U'):
while (bp > G.line_buf) {
full_write(STDOUT_FILENO, "\010 \010", 3);
bp--;
}
break;
case CTL('C'):
case CTL('D'):
finalize_tty_attrs();
exit(EXIT_SUCCESS);
case '\0':
/* BREAK. If we have speeds to try,
* return NULL (will switch speeds and return here) */
if (G.numspeed > 1)
return NULL;
/* fall through and ignore it */
default:
if ((unsigned char)c < ' ') {
/* ignore garbage characters */
} else if ((int)(bp - G.line_buf) < sizeof(G.line_buf) - 1) {
/* echo and store the character */
full_write(STDOUT_FILENO, &c, 1);
*bp++ = c;
}
break;
}
} /* end of get char loop */
got_logname: ;
} while (G.line_buf[0] == '\0'); /* while logname is empty */
return G.line_buf;
}
static void alarm_handler(int sig UNUSED_PARAM)
{
finalize_tty_attrs();
_exit(EXIT_SUCCESS);
}
static void sleep10(void)
{
sleep(10);
}
int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2008-07-05 14:48:54 +05:30
int getty_main(int argc UNUSED_PARAM, char **argv)
{
int n;
pid_t pid, tsid;
char *logname;
INIT_G();
G.login = _PATH_LOGIN; /* default login program */
#ifdef ISSUE
G.issue = ISSUE; /* default issue file */
#endif
G.eol = '\r';
/* Parse command-line arguments */
parse_args(argv);
/* Create new session and pgrp, lose controlling tty */
pid = setsid(); /* this also gives us our pid :) */
if (pid < 0) {
int fd;
/* :(
* docs/ctty.htm says:
* "This is allowed only when the current process
* is not a process group leader".
* Thus, setsid() will fail if we _already_ are
* a session leader - which is quite possible for getty!
*/
pid = getpid();
if (getsid(0) != pid) {
//for debugging:
//bb_perror_msg_and_die("setsid failed:"
// " pid %d ppid %d"
// " sid %d pgid %d",
// pid, getppid(),
// getsid(0), getpgid(0));
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die("setsid");
/*
* When we can end up here?
* Example: setsid() fails when run alone in interactive shell:
* # getty 115200 /dev/tty2
* because shell's child (getty) is put in a new process group.
* But doesn't fail if shell is not interactive
* (and therefore doesn't create process groups for pipes),
* or if getty is not the first process in the process group:
* # true | getty 115200 /dev/tty2
*/
}
/* Looks like we are already a session leader.
* In this case (setsid failed) we may still have ctty,
* and it may be different from tty we need to control!
* If we still have ctty, on Linux ioctl(TIOCSCTTY)
* (which we are going to use a bit later) always fails -
* even if we try to take ctty which is already ours!
* Try to drop old ctty now to prevent that.
* Use O_NONBLOCK: old ctty may be a serial line.
*/
fd = open("/dev/tty", O_RDWR | O_NONBLOCK);
if (fd >= 0) {
/* TIOCNOTTY sends SIGHUP to the foreground
* process group - which may include us!
* Make sure to not die on it:
*/
sighandler_t old = signal(SIGHUP, SIG_IGN);
ioctl(fd, TIOCNOTTY);
close(fd);
signal(SIGHUP, old);
}
}
/* 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_func = sleep10;
2006-10-23 07:40:45 +05:30
msg_eol = "\r\n";
/* most likely will internally use fd #3 in CLOEXEC mode: */
2006-10-04 02:30:43 +05:30
openlog(applet_name, LOG_PID, LOG_AUTH);
logmode = LOGMODE_BOTH;
#ifdef DEBUGGING
dbf = xfopen_for_write(DEBUGTERM);
for (n = 1; argv[n]; n++) {
debug(argv[n]);
debug("\n");
}
#endif
/* Open the tty as standard input, if it is not "-" */
debug("calling open_tty\n");
open_tty();
ndelay_off(STDIN_FILENO);
debug("duping\n");
xdup2(STDIN_FILENO, 1);
xdup2(STDIN_FILENO, 2);
/* Steal ctty if we don't have it yet */
tsid = tcgetsid(STDIN_FILENO);
if (tsid < 0 || pid != tsid) {
if (ioctl(STDIN_FILENO, TIOCSCTTY, /*force:*/ (long)1) < 0)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die("TIOCSCTTY");
}
#ifdef __linux__
/* Make ourself a foreground process group within our session */
if (tcsetpgrp(STDIN_FILENO, pid) < 0)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die("tcsetpgrp");
#endif
/*
* 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 (tcgetattr(STDIN_FILENO, &G.tty_attrs) < 0)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die("tcgetattr");
/* Update the utmp file. This tty is ours now! */
update_utmp(pid, LOGIN_PROCESS, G.tty_name, "LOGIN", G.fakehost);
/* Initialize tty attrs (raw mode, eight-bit, blocking i/o) */
debug("calling init_tty_attrs\n");
init_tty_attrs(G.speeds[0]);
/* Write the modem init string and DON'T flush the buffers */
if (option_mask32 & F_INITSTRING) {
debug("writing init string\n");
full_write1_str(G.initstring);
}
/* Optionally detect the baud rate from the modem status message */
debug("before autobaud\n");
if (option_mask32 & F_PARSE)
auto_baud();
/* Set the optional timer */
signal(SIGALRM, alarm_handler);
alarm(G.timeout); /* if 0, alarm is not set */
/* Optionally wait for CR or LF before writing /etc/issue */
if (option_mask32 & F_WAITCRLF) {
char ch;
debug("waiting for cr-lf\n");
while (safe_read(STDIN_FILENO, &ch, 1) == 1) {
debug("read %x\n", (unsigned char)ch);
if (ch == '\n' || ch == '\r')
break;
}
}
logname = NULL;
if (!(option_mask32 & F_NOPROMPT)) {
/* NB: init_tty_attrs already set line speed
* to G.speeds[0] */
int baud_index = 0;
while (1) {
/* Read the login name */
debug("reading login name\n");
logname = get_logname();
if (logname)
break;
/* We are here only if G.numspeed > 1 */
baud_index = (baud_index + 1) % G.numspeed;
cfsetspeed(&G.tty_attrs, G.speeds[baud_index]);
set_tty_attrs();
}
}
/* Disable timer */
alarm(0);
finalize_tty_attrs();
/* Let the login program take care of password validation */
/* 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(G.login, G.login, "--", logname, (char *)0);
bb_error_msg_and_die("can't execute '%s'", G.login);
}