blob: 467316fb80a621ada7ce6d3efa8234c7babee27c [file] [log] [blame]
Robert Griebl1fca5582002-06-04 20:45:46 +00001/* vi: set sw=4 ts=4: */
2/* agetty.c - another getty program for Linux. By W. Z. Venema 1989
"Robert P. J. Day"801ab142006-07-12 07:56:04 +00003 * 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 *
Denis Vlasenkob44c7902008-03-17 09:29:43 +00009 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
"Robert P. J. Day"801ab142006-07-12 07:56:04 +000010 * - added Native Language Support
Denis Vlasenkob44c7902008-03-17 09:29:43 +000011 *
"Robert P. J. Day"801ab142006-07-12 07:56:04 +000012 * 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.
"Robert P. J. Day"801ab142006-07-12 07:56:04 +000016 */
Robert Griebl1fca5582002-06-04 20:45:46 +000017
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000018#include "libbb.h"
Denis Vlasenkof7026522006-09-19 13:50:55 +000019#include <syslog.h>
Robert Griebl1fca5582002-06-04 20:45:46 +000020
Denis Vlasenko6476cc12006-11-07 01:52:10 +000021#if ENABLE_FEATURE_UTMP
Denis Vlasenko9725daa2008-09-11 09:54:23 +000022#include <utmp.h> /* updwtmp() */
Mike Frysingerb3810092005-07-01 01:29:44 +000023#endif
24
Denis Vlasenko6476cc12006-11-07 01:52:10 +000025/*
26 * Some heuristics to find out what environment we are in: if it is not
27 * System V, assume it is SunOS 4.
28 */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000029#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
Denis Vlasenko6476cc12006-11-07 01:52:10 +000030#include <sys/utsname.h>
Denis Vlasenkof3fca912007-12-04 18:46:01 +000031#else /* if !sysV style, wtmp/utmp code is off */
32#undef ENABLE_FEATURE_UTMP
33#undef ENABLE_FEATURE_WTMP
34#define ENABLE_FEATURE_UTMP 0
35#define ENABLE_FEATURE_WTMP 0
Eric Andersenfdfe2982002-10-10 03:55:09 +000036#endif /* LOGIN_PROCESS */
Robert Griebl1fca5582002-06-04 20:45:46 +000037
Denis Vlasenko6476cc12006-11-07 01:52:10 +000038/*
39 * Things you may want to modify.
40 *
41 * You may disagree with the default line-editing etc. characters defined
42 * below. Note, however, that DEL cannot be used for interrupt generation
43 * and for line editing at the same time.
44 */
Robert Griebl1fca5582002-06-04 20:45:46 +000045
Denis Vlasenko4e70bf42006-10-23 10:17:34 +000046/* I doubt there are systems which still need this */
47#undef HANDLE_ALLCAPS
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +000048#undef ANCIENT_BS_KILL_CHARS
Denis Vlasenko4e70bf42006-10-23 10:17:34 +000049
Denis Vlasenko6476cc12006-11-07 01:52:10 +000050#define _PATH_LOGIN "/bin/login"
Robert Griebl1fca5582002-06-04 20:45:46 +000051
Denis Vlasenko6476cc12006-11-07 01:52:10 +000052/* If ISSUE is not defined, getty will never display the contents of the
53 * /etc/issue file. You will not want to spit out large "issue" files at the
54 * wrong baud rate.
55 */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000056#define ISSUE "/etc/issue" /* displayed before the login prompt */
Eric Andersen77804ce2005-07-27 06:05:38 +000057
Robert Griebl1fca5582002-06-04 20:45:46 +000058/* Some shorthands for control characters. */
Denis Vlasenko397de612008-03-17 08:55:44 +000059#define CTL(x) ((x) ^ 0100) /* Assumes ASCII dialect */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000060#define CR CTL('M') /* carriage return */
61#define NL CTL('J') /* line feed */
62#define BS CTL('H') /* back space */
63#define DEL CTL('?') /* delete */
Robert Griebl1fca5582002-06-04 20:45:46 +000064
65/* Defaults for line-editing etc. characters; you may want to change this. */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000066#define DEF_ERASE DEL /* default erase character */
67#define DEF_INTR CTL('C') /* default interrupt character */
68#define DEF_QUIT CTL('\\') /* default quit char */
69#define DEF_KILL CTL('U') /* default kill char */
70#define DEF_EOF CTL('D') /* default EOF char */
71#define DEF_EOL '\n'
72#define DEF_SWITCH 0 /* default switch char */
Robert Griebl1fca5582002-06-04 20:45:46 +000073
Denis Vlasenko6476cc12006-11-07 01:52:10 +000074/*
75 * When multiple baud rates are specified on the command line, the first one
76 * we will try is the first one specified.
77 */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000078#define MAX_SPEED 10 /* max. nr. of baud rates */
Robert Griebl1fca5582002-06-04 20:45:46 +000079
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +000080/* Storage for command-line options. */
Robert Griebl1fca5582002-06-04 20:45:46 +000081struct options {
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000082 int flags; /* toggle switches, see below */
Denis Vlasenko13858992006-10-08 12:49:22 +000083 unsigned timeout; /* time-out period */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +000084 const char *login; /* login program */
85 const char *tty; /* name of tty */
86 const char *initstring; /* modem init string */
87 const char *issue; /* alternative issue file */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +000088 int numspeed; /* number of baud rates to try */
89 int speeds[MAX_SPEED]; /* baud rates to be tried */
Robert Griebl1fca5582002-06-04 20:45:46 +000090};
91
Robert Griebl1fca5582002-06-04 20:45:46 +000092/* Storage for things detected while the login name was read. */
Mike Frysingerb3810092005-07-01 01:29:44 +000093struct chardata {
Denis Vlasenko4e70bf42006-10-23 10:17:34 +000094 unsigned char erase; /* erase character */
95 unsigned char kill; /* kill character */
96 unsigned char eol; /* end-of-line character */
97 unsigned char parity; /* what parity did we see */
Denis Vlasenko397de612008-03-17 08:55:44 +000098 /* (parity & 1): saw odd parity char with 7th bit set */
99 /* (parity & 2): saw even parity char with 7th bit set */
100 /* parity == 0: probably 7-bit, space parity? */
101 /* parity == 1: probably 7-bit, odd parity? */
102 /* parity == 2: probably 7-bit, even parity? */
103 /* parity == 3: definitely 8 bit, no parity! */
104 /* Hmm... with any value of "parity" 8 bit, no parity is possible */
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000105#ifdef HANDLE_ALLCAPS
106 unsigned char capslock; /* upper case without lower case */
107#endif
Robert Griebl1fca5582002-06-04 20:45:46 +0000108};
109
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000110
Robert Griebl1fca5582002-06-04 20:45:46 +0000111/* Initial values for the above. */
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000112static const struct chardata init_chardata = {
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000113 DEF_ERASE, /* default erase character */
114 DEF_KILL, /* default kill character */
115 13, /* default eol char */
116 0, /* space parity */
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000117#ifdef HANDLE_ALLCAPS
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000118 0, /* no capslock */
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000119#endif
Robert Griebl1fca5582002-06-04 20:45:46 +0000120};
121
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000122static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
123#define F_INITSTRING (1 << 0) /* -I initstring is set */
124#define F_LOCAL (1 << 1) /* -L force local */
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000125#define F_FAKEHOST (1 << 2) /* -H fake hostname */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000126#define F_CUSTISSUE (1 << 3) /* -f give alternative issue file */
127#define F_RTSCTS (1 << 4) /* -h enable RTS/CTS flow control */
128#define F_ISSUE (1 << 5) /* -i display /etc/issue */
129#define F_LOGIN (1 << 6) /* -l non-default login program */
130#define F_PARSE (1 << 7) /* -m process modem status messages */
131#define F_TIMEOUT (1 << 8) /* -t time out */
132#define F_WAITCRLF (1 << 9) /* -w wait for CR or LF */
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000133#define F_NOPROMPT (1 << 10) /* -n don't ask for login name */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000134
Robert Griebl1fca5582002-06-04 20:45:46 +0000135
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000136#define line_buf bb_common_bufsiz1
Robert Griebl1fca5582002-06-04 20:45:46 +0000137
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000138/* The following is used for understandable diagnostics. */
Robert Griebl1fca5582002-06-04 20:45:46 +0000139#ifdef DEBUGGING
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000140static FILE *dbf;
Denis Vlasenko397de612008-03-17 08:55:44 +0000141#define DEBUGTERM "/dev/ttyp0"
142#define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0)
Robert Griebl1fca5582002-06-04 20:45:46 +0000143#else
Denis Vlasenko397de612008-03-17 08:55:44 +0000144#define debug(...) ((void)0)
Robert Griebl1fca5582002-06-04 20:45:46 +0000145#endif
146
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000147
Denis Vlasenko397de612008-03-17 08:55:44 +0000148/* bcode - convert speed string to speed code; return <= 0 on failure */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000149static int bcode(const char *s)
150{
Denis Vlasenko397de612008-03-17 08:55:44 +0000151 int value = bb_strtou(s, NULL, 10); /* yes, int is intended! */
152 if (value < 0) /* bad terminating char, overflow, etc */
153 return value;
154 return tty_value_to_baud(value);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000155}
156
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000157/* parse_speeds - parse alternate baud rates */
158static void parse_speeds(struct options *op, char *arg)
159{
160 char *cp;
161
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000162 /* NB: at least one iteration is always done */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000163 debug("entered parse_speeds\n");
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000164 while ((cp = strsep(&arg, ",")) != NULL) {
Denis Vlasenko6bef3d12007-11-06 03:05:54 +0000165 op->speeds[op->numspeed] = bcode(cp);
166 if (op->speeds[op->numspeed] <= 0)
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000167 bb_error_msg_and_die("bad speed: %s", cp);
Denis Vlasenko6bef3d12007-11-06 03:05:54 +0000168 op->numspeed++;
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000169 if (op->numspeed > MAX_SPEED)
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000170 bb_error_msg_and_die("too many alternate speeds");
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000171 }
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000172 debug("exiting parse_speeds\n");
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000173}
174
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000175/* parse_args - parse command-line arguments */
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000176static void parse_args(char **argv, struct options *op, char **fakehost_p)
Robert Griebl1fca5582002-06-04 20:45:46 +0000177{
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000178 char *ts;
Robert Griebl1fca5582002-06-04 20:45:46 +0000179
Denis Vlasenko397de612008-03-17 08:55:44 +0000180 opt_complementary = "-2:t+"; /* at least 2 args; -t N */
Denis Vlasenkofe7cd642007-08-18 15:32:12 +0000181 op->flags = getopt32(argv, opt_string,
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000182 &(op->initstring), fakehost_p, &(op->issue),
Denis Vlasenko397de612008-03-17 08:55:44 +0000183 &(op->login), &op->timeout);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000184 argv += optind;
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000185 if (op->flags & F_INITSTRING) {
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000186 const char *p = op->initstring;
187 char *q;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000188
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000189 op->initstring = q = xstrdup(p);
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000190 /* copy optarg into op->initstring decoding \ddd
191 octal codes into chars */
192 while (*p) {
193 if (*p == '\\') {
194 p++;
195 *q++ = bb_process_escape_sequence(&p);
196 } else {
197 *q++ = *p++;
Robert Griebl1fca5582002-06-04 20:45:46 +0000198 }
Robert Griebl1fca5582002-06-04 20:45:46 +0000199 }
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000200 *q = '\0';
201 }
Denis Vlasenko397de612008-03-17 08:55:44 +0000202 op->flags ^= F_ISSUE; /* invert flag "show /etc/issue" */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000203 debug("after getopt\n");
Robert Griebl1fca5582002-06-04 20:45:46 +0000204
205 /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000206 op->tty = argv[0]; /* tty name */
207 ts = argv[1]; /* baud rate(s) */
Denis Vlasenko9af7c9d2007-01-19 21:19:35 +0000208 if (isdigit(argv[0][0])) {
Robert Griebl1fca5582002-06-04 20:45:46 +0000209 /* a number first, assume it's a speed (BSD style) */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000210 op->tty = ts; /* tty name is in argv[1] */
211 ts = argv[0]; /* baud rate(s) */
Robert Griebl1fca5582002-06-04 20:45:46 +0000212 }
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000213 parse_speeds(op, ts);
Robert Griebl1fca5582002-06-04 20:45:46 +0000214
Denis Vlasenko397de612008-03-17 08:55:44 +0000215// TODO: if applet_name is set to "getty: TTY", bb_error_msg's get simpler!
216// grep for "%s:"
217
Denis Vlasenko50e77e12006-10-23 02:11:22 +0000218 if (argv[2])
Denis Vlasenko397de612008-03-17 08:55:44 +0000219 xsetenv("TERM", argv[2]);
Robert Griebl1fca5582002-06-04 20:45:46 +0000220
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000221 debug("exiting parse_args\n");
Robert Griebl1fca5582002-06-04 20:45:46 +0000222}
223
Robert Griebl1fca5582002-06-04 20:45:46 +0000224/* open_tty - set up tty as standard { input, output, error } */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000225static void open_tty(const char *tty)
Robert Griebl1fca5582002-06-04 20:45:46 +0000226{
Robert Griebl1fca5582002-06-04 20:45:46 +0000227 /* Set up new standard input, unless we are given an already opened port. */
Denis Vlasenko9f739442006-12-16 23:49:13 +0000228 if (NOT_LONE_DASH(tty)) {
Denis Vlasenko397de612008-03-17 08:55:44 +0000229// struct stat st;
230// int cur_dir_fd;
231// int fd;
Robert Griebl1fca5582002-06-04 20:45:46 +0000232
233 /* Sanity checks... */
Denis Vlasenko397de612008-03-17 08:55:44 +0000234// cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
235// xchdir("/dev");
236// xstat(tty, &st);
237// if ((st.st_mode & S_IFMT) != S_IFCHR)
238// bb_error_msg_and_die("%s: not a character device", tty);
239
240 if (tty[0] != '/')
241 tty = xasprintf("/dev/%s", tty); /* will leak it */
Robert Griebl1fca5582002-06-04 20:45:46 +0000242
243 /* Open the tty as standard input. */
Robert Griebl1fca5582002-06-04 20:45:46 +0000244 debug("open(2)\n");
Denis Vlasenko397de612008-03-17 08:55:44 +0000245 close(0);
246 /*fd =*/ xopen(tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000247
Denis Vlasenko397de612008-03-17 08:55:44 +0000248// /* Restore current directory */
249// fchdir(cur_dir_fd);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000250
251 /* Open the tty as standard input, continued */
Denis Vlasenko397de612008-03-17 08:55:44 +0000252// xmove_fd(fd, 0);
253// /* fd is >= cur_dir_fd, and cur_dir_fd gets closed too here: */
254// while (fd > 2)
255// close(fd--);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000256
Denis Vlasenko397de612008-03-17 08:55:44 +0000257 /* Set proper protections and ownership. */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000258 fchown(0, 0, 0); /* 0:0 */
Denis Vlasenko397de612008-03-17 08:55:44 +0000259 fchmod(0, 0620); /* crw--w---- */
Robert Griebl1fca5582002-06-04 20:45:46 +0000260 } else {
Robert Griebl1fca5582002-06-04 20:45:46 +0000261 /*
262 * Standard input should already be connected to an open port. Make
263 * sure it is open for read/write.
264 */
Denis Vlasenkod37f2222007-08-19 13:42:08 +0000265 if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
Denis Vlasenkoe06bed32007-01-27 22:21:12 +0000266 bb_error_msg_and_die("stdin is not open for read/write");
Robert Griebl1fca5582002-06-04 20:45:46 +0000267 }
Robert Griebl1fca5582002-06-04 20:45:46 +0000268}
269
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000270/* termios_init - initialize termios settings */
271static void termios_init(struct termios *tp, int speed, struct options *op)
Robert Griebl1fca5582002-06-04 20:45:46 +0000272{
Robert Griebl1fca5582002-06-04 20:45:46 +0000273 /*
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000274 * Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
Robert Griebl1fca5582002-06-04 20:45:46 +0000275 * Special characters are set after we have read the login name; all
276 * reads will be done in raw mode anyway. Errors will be dealt with
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000277 * later on.
Robert Griebl1fca5582002-06-04 20:45:46 +0000278 */
279#ifdef __linux__
280 /* flush input and output queues, important for modems! */
Denis Vlasenko202ac502008-11-05 13:20:58 +0000281 ioctl(0, TCFLSH, TCIOFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
Robert Griebl1fca5582002-06-04 20:45:46 +0000282#endif
283
284 tp->c_cflag = CS8 | HUPCL | CREAD | speed;
Denis Vlasenko397de612008-03-17 08:55:44 +0000285 if (op->flags & F_LOCAL)
Robert Griebl1fca5582002-06-04 20:45:46 +0000286 tp->c_cflag |= CLOCAL;
Robert Griebl1fca5582002-06-04 20:45:46 +0000287
Rob Landleyf78ab532006-08-24 20:00:44 +0000288 tp->c_iflag = tp->c_lflag = tp->c_line = 0;
289 tp->c_oflag = OPOST | ONLCR;
Robert Griebl1fca5582002-06-04 20:45:46 +0000290 tp->c_cc[VMIN] = 1;
291 tp->c_cc[VTIME] = 0;
292
293 /* Optionally enable hardware flow control */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000294#ifdef CRTSCTS
Robert Griebl1fca5582002-06-04 20:45:46 +0000295 if (op->flags & F_RTSCTS)
296 tp->c_cflag |= CRTSCTS;
297#endif
298
Denis Vlasenko202ac502008-11-05 13:20:58 +0000299 tcsetattr_stdin_TCSANOW(tp);
Robert Griebl1fca5582002-06-04 20:45:46 +0000300
Robert Griebl1fca5582002-06-04 20:45:46 +0000301 debug("term_io 2\n");
302}
303
304/* auto_baud - extract baud rate from modem status message */
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000305static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
Robert Griebl1fca5582002-06-04 20:45:46 +0000306{
307 int speed;
308 int vmin;
309 unsigned iflag;
Robert Griebl1fca5582002-06-04 20:45:46 +0000310 char *bp;
311 int nread;
312
313 /*
314 * This works only if the modem produces its status code AFTER raising
315 * the DCD line, and if the computer is fast enough to set the proper
316 * baud rate before the message has gone by. We expect a message of the
317 * following format:
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000318 *
Robert Griebl1fca5582002-06-04 20:45:46 +0000319 * <junk><number><junk>
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000320 *
Robert Griebl1fca5582002-06-04 20:45:46 +0000321 * The number is interpreted as the baud rate of the incoming call. If the
322 * modem does not tell us the baud rate within one second, we will keep
323 * using the current baud rate. It is advisable to enable BREAK
324 * processing (comma-separated list of baud rates) if the processing of
325 * modem status messages is enabled.
326 */
327
328 /*
329 * Use 7-bit characters, don't block if input queue is empty. Errors will
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000330 * be dealt with later on.
Robert Griebl1fca5582002-06-04 20:45:46 +0000331 */
Robert Griebl1fca5582002-06-04 20:45:46 +0000332 iflag = tp->c_iflag;
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000333 tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
Robert Griebl1fca5582002-06-04 20:45:46 +0000334 vmin = tp->c_cc[VMIN];
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000335 tp->c_cc[VMIN] = 0; /* don't block if queue empty */
Denis Vlasenko202ac502008-11-05 13:20:58 +0000336 tcsetattr_stdin_TCSANOW(tp);
Robert Griebl1fca5582002-06-04 20:45:46 +0000337
338 /*
339 * Wait for a while, then read everything the modem has said so far and
340 * try to extract the speed of the dial-in call.
341 */
Denis Vlasenko50e77e12006-10-23 02:11:22 +0000342 sleep(1);
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000343 nread = safe_read(STDIN_FILENO, buf, size_buf - 1);
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000344 if (nread > 0) {
Robert Griebl1fca5582002-06-04 20:45:46 +0000345 buf[nread] = '\0';
346 for (bp = buf; bp < buf + nread; bp++) {
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000347 if (isdigit(*bp)) {
Denis Vlasenko13858992006-10-08 12:49:22 +0000348 speed = bcode(bp);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000349 if (speed > 0) {
Robert Griebl1fca5582002-06-04 20:45:46 +0000350 tp->c_cflag &= ~CBAUD;
351 tp->c_cflag |= speed;
352 }
353 break;
354 }
355 }
356 }
Robert Griebl1fca5582002-06-04 20:45:46 +0000357
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000358 /* Restore terminal settings. Errors will be dealt with later on. */
Robert Griebl1fca5582002-06-04 20:45:46 +0000359 tp->c_iflag = iflag;
360 tp->c_cc[VMIN] = vmin;
Denis Vlasenko202ac502008-11-05 13:20:58 +0000361 tcsetattr_stdin_TCSANOW(tp);
Robert Griebl1fca5582002-06-04 20:45:46 +0000362}
363
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000364/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
Denis Vlasenko68404f12008-03-17 09:00:54 +0000365static void do_prompt(struct options *op)
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000366{
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000367#ifdef ISSUE
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000368 print_login_issue(op->issue, op->tty);
369#endif
370 print_login_prompt();
371}
372
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000373#ifdef HANDLE_ALLCAPS
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000374/* all_is_upcase - string contains upper case without lower case */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000375/* returns 1 if true, 0 if false */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000376static int all_is_upcase(const char *s)
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000377{
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000378 while (*s)
379 if (islower(*s++))
380 return 0;
381 return 1;
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000382}
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000383#endif
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000384
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000385/* get_logname - get user name, establish parity, speed, erase, kill, eol;
386 * return NULL on BREAK, logname on success */
Denis Vlasenko703aa132006-10-23 22:43:02 +0000387static char *get_logname(char *logname, unsigned size_logname,
Denis Vlasenko68404f12008-03-17 09:00:54 +0000388 struct options *op, struct chardata *cp)
Robert Griebl1fca5582002-06-04 20:45:46 +0000389{
Robert Griebl1fca5582002-06-04 20:45:46 +0000390 char *bp;
"Vladimir N. Oleynik"6f347ef2005-10-15 10:23:55 +0000391 char c; /* input character, full eight bits */
392 char ascval; /* low 7 bits of input character */
393 int bits; /* # of "1" bits per character */
394 int mask; /* mask with 1 bit up */
Denis Vlasenko397de612008-03-17 08:55:44 +0000395 static const char erase[][3] = {/* backspace-space-backspace */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000396 "\010\040\010", /* space parity */
397 "\010\040\010", /* odd parity */
398 "\210\240\210", /* even parity */
Denis Vlasenko397de612008-03-17 08:55:44 +0000399 "\010\040\010", /* 8 bit no parity */
Robert Griebl1fca5582002-06-04 20:45:46 +0000400 };
401
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000402 /* NB: *cp is pre-initialized with init_chardata */
Robert Griebl1fca5582002-06-04 20:45:46 +0000403
404 /* Flush pending input (esp. after parsing or switching the baud rate). */
Denis Vlasenko50e77e12006-10-23 02:11:22 +0000405 sleep(1);
Denis Vlasenko202ac502008-11-05 13:20:58 +0000406 ioctl(0, TCFLSH, TCIFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
Robert Griebl1fca5582002-06-04 20:45:46 +0000407
408 /* Prompt for and read a login name. */
Denis Vlasenko703aa132006-10-23 22:43:02 +0000409 logname[0] = '\0';
410 while (!logname[0]) {
Robert Griebl1fca5582002-06-04 20:45:46 +0000411 /* Write issue file and prompt, with "parity" bit == 0. */
Denis Vlasenko68404f12008-03-17 09:00:54 +0000412 do_prompt(op);
Robert Griebl1fca5582002-06-04 20:45:46 +0000413
414 /* Read name, watch for break, parity, erase, kill, end-of-line. */
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000415 bp = logname;
Denis Vlasenko703aa132006-10-23 22:43:02 +0000416 cp->eol = '\0';
417 while (cp->eol == '\0') {
Robert Griebl1fca5582002-06-04 20:45:46 +0000418
419 /* Do not report trivial EINTR/EIO errors. */
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000420 if (read(STDIN_FILENO, &c, 1) < 1) {
Robert Griebl1fca5582002-06-04 20:45:46 +0000421 if (errno == EINTR || errno == EIO)
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +0000422 exit(EXIT_SUCCESS);
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000423 bb_perror_msg_and_die("%s: read", op->tty);
Robert Griebl1fca5582002-06-04 20:45:46 +0000424 }
Robert Griebl1fca5582002-06-04 20:45:46 +0000425
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000426 /* BREAK. If we have speeds to try,
427 * return NULL (will switch speeds and return here) */
Denis Vlasenko703aa132006-10-23 22:43:02 +0000428 if (c == '\0' && op->numspeed > 1)
Robert Griebl1fca5582002-06-04 20:45:46 +0000429 return NULL;
430
431 /* Do parity bit handling. */
Denis Vlasenko397de612008-03-17 08:55:44 +0000432 if (!(op->flags & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */
Denis Vlasenko703aa132006-10-23 22:43:02 +0000433 bits = 1;
434 mask = 1;
Denis Vlasenko397de612008-03-17 08:55:44 +0000435 while (mask & 0x7f) {
436 if (mask & c)
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000437 bits++; /* count "1" bits */
Denis Vlasenko703aa132006-10-23 22:43:02 +0000438 mask <<= 1;
439 }
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000440 /* ... |= 2 - even, 1 - odd */
441 cp->parity |= 2 - (bits & 1);
Robert Griebl1fca5582002-06-04 20:45:46 +0000442 }
Robert Griebl1fca5582002-06-04 20:45:46 +0000443
Denis Vlasenko703aa132006-10-23 22:43:02 +0000444 /* Do erase, kill and end-of-line processing. */
Denis Vlasenko397de612008-03-17 08:55:44 +0000445 ascval = c & 0x7f;
Robert Griebl1fca5582002-06-04 20:45:46 +0000446 switch (ascval) {
447 case CR:
448 case NL:
Denis Vlasenko703aa132006-10-23 22:43:02 +0000449 *bp = '\0'; /* terminate logname */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000450 cp->eol = ascval; /* set end-of-line char */
Robert Griebl1fca5582002-06-04 20:45:46 +0000451 break;
452 case BS:
453 case DEL:
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000454#ifdef ANCIENT_BS_KILL_CHARS
Robert Griebl1fca5582002-06-04 20:45:46 +0000455 case '#':
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000456#endif
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000457 cp->erase = ascval; /* set erase character */
Robert Griebl1fca5582002-06-04 20:45:46 +0000458 if (bp > logname) {
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000459 full_write(STDOUT_FILENO, erase[cp->parity], 3);
Robert Griebl1fca5582002-06-04 20:45:46 +0000460 bp--;
461 }
462 break;
463 case CTL('U'):
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000464#ifdef ANCIENT_BS_KILL_CHARS
Robert Griebl1fca5582002-06-04 20:45:46 +0000465 case '@':
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000466#endif
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000467 cp->kill = ascval; /* set kill character */
Robert Griebl1fca5582002-06-04 20:45:46 +0000468 while (bp > logname) {
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000469 full_write(STDOUT_FILENO, erase[cp->parity], 3);
Robert Griebl1fca5582002-06-04 20:45:46 +0000470 bp--;
471 }
472 break;
473 case CTL('D'):
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +0000474 exit(EXIT_SUCCESS);
Robert Griebl1fca5582002-06-04 20:45:46 +0000475 default:
Bernhard Reutner-Fischere44a4e32009-01-09 14:49:11 +0000476 if (!isprint(ascval)) {
Denis Vlasenko703aa132006-10-23 22:43:02 +0000477 /* ignore garbage characters */
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000478 } else if ((int)(bp - logname) >= size_logname - 1) {
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000479 bb_error_msg_and_die("%s: input overrun", op->tty);
Robert Griebl1fca5582002-06-04 20:45:46 +0000480 } else {
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000481 full_write(STDOUT_FILENO, &c, 1); /* echo the character */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000482 *bp++ = ascval; /* and store it */
Robert Griebl1fca5582002-06-04 20:45:46 +0000483 }
484 break;
485 }
486 }
487 }
488 /* Handle names with upper case and no lower case. */
489
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000490#ifdef HANDLE_ALLCAPS
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000491 cp->capslock = all_is_upcase(logname);
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000492 if (cp->capslock) {
Robert Griebl1fca5582002-06-04 20:45:46 +0000493 for (bp = logname; *bp; bp++)
494 if (isupper(*bp))
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000495 *bp = tolower(*bp); /* map name to lower case */
Robert Griebl1fca5582002-06-04 20:45:46 +0000496 }
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000497#endif
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000498 return logname;
Robert Griebl1fca5582002-06-04 20:45:46 +0000499}
500
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000501/* termios_final - set the final tty mode bits */
502static void termios_final(struct options *op, struct termios *tp, struct chardata *cp)
Robert Griebl1fca5582002-06-04 20:45:46 +0000503{
504 /* General terminal-independent stuff. */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000505 tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
Robert Griebl1fca5582002-06-04 20:45:46 +0000506 tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
507 /* no longer| ECHOCTL | ECHOPRT */
508 tp->c_oflag |= OPOST;
509 /* tp->c_cflag = 0; */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000510 tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
511 tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
512 tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
Robert Griebl1fca5582002-06-04 20:45:46 +0000513 tp->c_cc[VEOL] = DEF_EOL;
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000514 tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
Robert Griebl1fca5582002-06-04 20:45:46 +0000515
516 /* Account for special characters seen in input. */
Robert Griebl1fca5582002-06-04 20:45:46 +0000517 if (cp->eol == CR) {
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000518 tp->c_iflag |= ICRNL; /* map CR in input to NL */
519 tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
Robert Griebl1fca5582002-06-04 20:45:46 +0000520 }
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000521 tp->c_cc[VERASE] = cp->erase; /* set erase character */
522 tp->c_cc[VKILL] = cp->kill; /* set kill character */
Robert Griebl1fca5582002-06-04 20:45:46 +0000523
524 /* Account for the presence or absence of parity bits in input. */
Robert Griebl1fca5582002-06-04 20:45:46 +0000525 switch (cp->parity) {
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000526 case 0: /* space (always 0) parity */
Denis Vlasenko397de612008-03-17 08:55:44 +0000527// I bet most people go here - they use only 7-bit chars in usernames....
Robert Griebl1fca5582002-06-04 20:45:46 +0000528 break;
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000529 case 1: /* odd parity */
Robert Griebl1fca5582002-06-04 20:45:46 +0000530 tp->c_cflag |= PARODD;
531 /* FALLTHROUGH */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000532 case 2: /* even parity */
Robert Griebl1fca5582002-06-04 20:45:46 +0000533 tp->c_cflag |= PARENB;
534 tp->c_iflag |= INPCK | ISTRIP;
535 /* FALLTHROUGH */
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000536 case (1 | 2): /* no parity bit */
Robert Griebl1fca5582002-06-04 20:45:46 +0000537 tp->c_cflag &= ~CSIZE;
538 tp->c_cflag |= CS7;
Denis Vlasenko397de612008-03-17 08:55:44 +0000539// FIXME: wtf? case 3: we saw both even and odd 8-bit bytes -
540// it's probably some umlauts etc, but definitely NOT 7-bit!!!
541// Entire parity detection madness here just begs for deletion...
Robert Griebl1fca5582002-06-04 20:45:46 +0000542 break;
543 }
Robert Griebl1fca5582002-06-04 20:45:46 +0000544
Denis Vlasenkoe06bed32007-01-27 22:21:12 +0000545 /* Account for upper case without lower case. */
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000546#ifdef HANDLE_ALLCAPS
Robert Griebl1fca5582002-06-04 20:45:46 +0000547 if (cp->capslock) {
548 tp->c_iflag |= IUCLC;
549 tp->c_lflag |= XCASE;
550 tp->c_oflag |= OLCUC;
551 }
Denis Vlasenko4e70bf42006-10-23 10:17:34 +0000552#endif
Robert Griebl1fca5582002-06-04 20:45:46 +0000553 /* Optionally enable hardware flow control */
Denis Vlasenko202ac502008-11-05 13:20:58 +0000554#ifdef CRTSCTS
Robert Griebl1fca5582002-06-04 20:45:46 +0000555 if (op->flags & F_RTSCTS)
556 tp->c_cflag |= CRTSCTS;
557#endif
558
559 /* Finally, make the new settings effective */
Denis Vlasenko202ac502008-11-05 13:20:58 +0000560 /* It's tcsetattr_stdin_TCSANOW() + error check */
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +0000561 ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
Robert Griebl1fca5582002-06-04 20:45:46 +0000562}
563
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000564#if ENABLE_FEATURE_UTMP
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000565static void touch(const char *filename)
566{
567 if (access(filename, R_OK | W_OK) == -1)
568 close(open(filename, O_WRONLY | O_CREAT, 0664));
569}
570
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000571/* update_utmp - update our utmp entry */
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000572static void update_utmp(const char *line, char *fakehost)
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000573{
574 struct utmp ut;
575 struct utmp *utp;
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000576 int mypid = getpid();
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000577
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000578 /* In case we won't find an entry below... */
579 memset(&ut, 0, sizeof(ut));
580 safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
581
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000582 /*
583 * The utmp file holds miscellaneous information about things started by
584 * /sbin/init and other system-related events. Our purpose is to update
585 * the utmp entry for the current process, in particular the process type
586 * and the tty line we are listening to. Return successfully only if the
587 * utmp file can be opened for update, and if we are able to find our
588 * entry in the utmp file.
589 */
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000590 touch(_PATH_UTMP);
591
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000592 utmpname(_PATH_UTMP);
593 setutent();
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000594 while ((utp = getutent()) != NULL) {
595 if (utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid) {
596 memcpy(&ut, utp, sizeof(ut));
597 break;
598 }
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000599 }
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000600
Rob Landleycf7577d2006-06-25 22:59:31 +0000601 strcpy(ut.ut_user, "LOGIN");
602 safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000603 if (fakehost)
Rob Landleycf7577d2006-06-25 22:59:31 +0000604 safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
Bernhard Reutner-Fischer62d85032008-06-01 10:10:22 +0000605 ut.ut_tv.tv_sec = time(NULL);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000606 ut.ut_type = LOGIN_PROCESS;
607 ut.ut_pid = mypid;
608
609 pututline(&ut);
610 endutent();
611
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000612#if ENABLE_FEATURE_WTMP
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000613 touch(bb_path_wtmp_file);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000614 updwtmp(bb_path_wtmp_file, &ut);
615#endif
Robert Griebl1fca5582002-06-04 20:45:46 +0000616}
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000617#endif /* CONFIG_FEATURE_UTMP */
Robert Griebl1fca5582002-06-04 20:45:46 +0000618
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000619int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000620int getty_main(int argc UNUSED_PARAM, char **argv)
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000621{
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000622 int n;
Denis Vlasenkof3fca912007-12-04 18:46:01 +0000623 char *fakehost = NULL; /* Fake hostname for ut_host */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000624 char *logname; /* login name, given to /bin/login */
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000625 /* Merging these into "struct local" may _seem_ to reduce
626 * parameter passing, but today's gcc will inline
627 * statics which are called once anyway, so don't do that */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000628 struct chardata chardata; /* set by get_logname() */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000629 struct termios termios; /* terminal mode bits */
630 struct options options;
631
Denis Vlasenko397de612008-03-17 08:55:44 +0000632 chardata = init_chardata;
633
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000634 memset(&options, 0, sizeof(options));
635 options.login = _PATH_LOGIN; /* default login program */
636 options.tty = "tty1"; /* default tty line */
637 options.initstring = ""; /* modem init string */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000638#ifdef ISSUE
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000639 options.issue = ISSUE; /* default issue file */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000640#endif
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000641
Denis Vlasenko397de612008-03-17 08:55:44 +0000642 /* Parse command-line arguments. */
643 parse_args(argv, &options, &fakehost);
644
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000645 logmode = LOGMODE_NONE;
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000646
647 /* Create new session, lose controlling tty, if any */
648 /* docs/ctty.htm says:
649 * "This is allowed only when the current process
650 * is not a process group leader" - is this a problem? */
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000651 setsid();
Denis Vlasenko397de612008-03-17 08:55:44 +0000652 /* close stdio, and stray descriptors, just in case */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000653 n = xopen(bb_dev_null, O_RDWR);
Denis Vlasenko397de612008-03-17 08:55:44 +0000654 /* dup2(n, 0); - no, we need to handle "getty - 9600" too */
655 xdup2(n, 1);
656 xdup2(n, 2);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000657 while (n > 2)
658 close(n--);
Denis Vlasenko397de612008-03-17 08:55:44 +0000659
660 /* Logging. We want special flavor of error_msg_and_die */
Denis Vlasenkodce3fde2006-10-23 02:10:45 +0000661 die_sleep = 10;
662 msg_eol = "\r\n";
Denis Vlasenko397de612008-03-17 08:55:44 +0000663 /* most likely will internally use fd #3 in CLOEXEC mode: */
Denis Vlasenko8f8f2682006-10-03 21:00:43 +0000664 openlog(applet_name, LOG_PID, LOG_AUTH);
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000665 logmode = LOGMODE_BOTH;
666
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000667#ifdef DEBUGGING
Denis Vlasenko5415c852008-07-21 23:05:26 +0000668 dbf = xfopen_for_write(DEBUGTERM);
Denis Vlasenko68404f12008-03-17 09:00:54 +0000669 for (n = 1; argv[n]; n++) {
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000670 debug(argv[n]);
671 debug("\n");
Robert Griebl1fca5582002-06-04 20:45:46 +0000672 }
673#endif
"Vladimir N. Oleynik"3e245c92005-09-29 11:31:26 +0000674
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000675 /* Open the tty as standard input, if it is not "-" */
Denis Vlasenko397de612008-03-17 08:55:44 +0000676 /* If it's not "-" and not taken yet, it will become our ctty */
677 debug("calling open_tty\n");
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000678 open_tty(options.tty);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000679 ndelay_off(0);
Denis Vlasenko397de612008-03-17 08:55:44 +0000680 debug("duping\n");
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000681 xdup2(0, 1);
682 xdup2(0, 2);
683
684 /*
685 * The following ioctl will fail if stdin is not a tty, but also when
686 * there is noise on the modem control lines. In the latter case, the
687 * common course of action is (1) fix your cables (2) give the modem more
688 * time to properly reset after hanging up. SunOS users can achieve (2)
689 * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
690 * 5 seconds seems to be a good value.
691 */
Denis Vlasenko202ac502008-11-05 13:20:58 +0000692 /* tcgetattr() + error check */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000693 ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000694
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000695#ifdef __linux__
Denis Vlasenko397de612008-03-17 08:55:44 +0000696// FIXME: do we need this? Otherwise "-" case seems to be broken...
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000697 // /* Forcibly make fd 0 our controlling tty, even if another session
698 // * has it as a ctty. (Another session loses ctty). */
699 // ioctl(0, TIOCSCTTY, (void*)1);
Denis Vlasenko397de612008-03-17 08:55:44 +0000700 /* Make ourself a foreground process group within our session */
701 tcsetpgrp(0, getpid());
702#endif
703
704#if ENABLE_FEATURE_UTMP
705 /* Update the utmp file. This tty is ours now! */
706 update_utmp(options.tty, fakehost);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000707#endif
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000708
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000709 /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
710 debug("calling termios_init\n");
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000711 termios_init(&termios, options.speeds[0], &options);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000712
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000713 /* Write the modem init string and DON'T flush the buffers */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000714 if (options.flags & F_INITSTRING) {
715 debug("writing init string\n");
Denis Vlasenko73c571a2009-03-09 00:12:37 +0000716 /* todo: use xwrite_str? */
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000717 full_write(STDOUT_FILENO, options.initstring, strlen(options.initstring));
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000718 }
719
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000720 /* Optionally detect the baud rate from the modem status message */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000721 debug("before autobaud\n");
722 if (options.flags & F_PARSE)
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000723 auto_baud(line_buf, sizeof(line_buf), &termios);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000724
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000725 /* Set the optional timer */
Denis Vlasenko397de612008-03-17 08:55:44 +0000726 alarm(options.timeout); /* if 0, alarm is not set */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000727
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000728 /* Optionally wait for CR or LF before writing /etc/issue */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000729 if (options.flags & F_WAITCRLF) {
730 char ch;
731
732 debug("waiting for cr-lf\n");
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000733 while (safe_read(STDIN_FILENO, &ch, 1) == 1) {
Denis Vlasenko397de612008-03-17 08:55:44 +0000734 debug("read %x\n", (unsigned char)ch);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000735 ch &= 0x7f; /* strip "parity bit" */
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000736 if (ch == '\n' || ch == '\r')
737 break;
738 }
739 }
740
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000741 logname = NULL;
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000742 if (!(options.flags & F_NOPROMPT)) {
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000743 /* NB:termios_init already set line speed
744 * to options.speeds[0] */
745 int baud_index = 0;
746
747 while (1) {
748 /* Read the login name. */
749 debug("reading login name\n");
750 logname = get_logname(line_buf, sizeof(line_buf),
Denis Vlasenko68404f12008-03-17 09:00:54 +0000751 &options, &chardata);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000752 if (logname)
753 break;
754 /* we are here only if options.numspeed > 1 */
755 baud_index = (baud_index + 1) % options.numspeed;
756 termios.c_cflag &= ~CBAUD;
757 termios.c_cflag |= options.speeds[baud_index];
Denis Vlasenko202ac502008-11-05 13:20:58 +0000758 tcsetattr_stdin_TCSANOW(&termios);
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000759 }
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000760 }
761
762 /* Disable timer. */
Denis Vlasenko397de612008-03-17 08:55:44 +0000763 alarm(0);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000764
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000765 /* Finalize the termios settings. */
Denis Vlasenko6476cc12006-11-07 01:52:10 +0000766 termios_final(&options, &termios, &chardata);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000767
768 /* Now the newline character should be properly written. */
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +0000769 full_write(STDOUT_FILENO, "\n", 1);
Bernhard Reutner-Fischer6d82f942006-06-16 16:37:07 +0000770
771 /* Let the login program take care of password validation. */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000772 /* We use PATH because we trust that root doesn't set "bad" PATH,
773 * and getty is not suid-root applet. */
Denis Vlasenko397de612008-03-17 08:55:44 +0000774 /* With -n, logname == NULL, and login will ask for username instead */
Denis Vlasenkod0bbbdc2007-12-04 09:48:40 +0000775 BB_EXECLP(options.login, options.login, "--", logname, NULL);
Denis Vlasenkoa9801652006-09-07 16:20:03 +0000776 bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login);
Robert Griebl1fca5582002-06-04 20:45:46 +0000777}