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function old new delta packed_usage 28706 28623 -83 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
658 lines
20 KiB
C
658 lines
20 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Based on agetty - another getty program for Linux. By W. Z. Venema 1989
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* Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
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* This program is freely distributable.
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*
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* option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
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*
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* 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
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* - Added Native Language Support
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*
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* 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
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* - Enabled hardware flow control before displaying /etc/issue
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*
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* 2011-01 Venys Vlasenko
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* - Removed parity detection code. It can't work reliably:
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* if all chars received have bit 7 cleared and odd (or even) parity,
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* it is impossible to determine whether other side is 8-bit,no-parity
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* or 7-bit,odd(even)-parity. It also interferes with non-ASCII usernames.
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* - From now on, we assume that parity is correctly set.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include <syslog.h>
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#ifndef IUCLC
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# define IUCLC 0
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#endif
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#ifndef LOGIN_PROCESS
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# undef ENABLE_FEATURE_UTMP
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# undef ENABLE_FEATURE_WTMP
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# define ENABLE_FEATURE_UTMP 0
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# define ENABLE_FEATURE_WTMP 0
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#endif
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/* The following is used for understandable diagnostics */
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#ifdef DEBUGGING
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static FILE *dbf;
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# define DEBUGTERM "/dev/ttyp0"
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# define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0)
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#else
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# define debug(...) ((void)0)
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#endif
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/*
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* Things you may want to modify.
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*
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* You may disagree with the default line-editing etc. characters defined
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* below. Note, however, that DEL cannot be used for interrupt generation
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* and for line editing at the same time.
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*/
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#undef _PATH_LOGIN
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#define _PATH_LOGIN "/bin/login"
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/* Displayed before the login prompt.
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* If ISSUE is not defined, getty will never display the contents of the
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* /etc/issue file. You will not want to spit out large "issue" files at the
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* wrong baud rate.
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*/
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#define ISSUE "/etc/issue"
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/* Some shorthands for control characters */
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#define CTL(x) ((x) ^ 0100) /* Assumes ASCII dialect */
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#define BS CTL('H') /* back space */
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#define DEL CTL('?') /* delete */
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/* Defaults for line-editing etc. characters; you may want to change this */
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#define DEF_INTR CTL('C') /* default interrupt character */
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#define DEF_QUIT CTL('\\') /* default quit char */
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#define DEF_KILL CTL('U') /* default kill char */
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#define DEF_EOF CTL('D') /* default EOF char */
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#define DEF_EOL '\n'
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#define DEF_SWITCH 0 /* default switch char (none) */
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/*
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* When multiple baud rates are specified on the command line,
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* the first one we will try is the first one specified.
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*/
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#define MAX_SPEED 10 /* max. nr. of baud rates */
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struct globals {
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unsigned timeout; /* time-out period */
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const char *login; /* login program */
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const char *fakehost;
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const char *tty; /* name of tty */
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char *initstring; /* modem init string */
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const char *issue; /* alternative issue file */
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int numspeed; /* number of baud rates to try */
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int speeds[MAX_SPEED]; /* baud rates to be tried */
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unsigned char eol; /* end-of-line char seen (CR or NL) */
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struct termios termios; /* terminal mode bits */
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char line_buf[128];
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};
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#define G (*ptr_to_globals)
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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} while (0)
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//usage:#define getty_trivial_usage
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//usage: "[OPTIONS] BAUD_RATE[,BAUD_RATE]... TTY [TERMTYPE]"
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//usage:#define getty_full_usage "\n\n"
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//usage: "Open a tty, prompt for a login name, then invoke /bin/login\n"
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//usage: "\n -h Enable hardware RTS/CTS flow control"
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//usage: "\n -L Set CLOCAL (ignore Carrier Detect state)"
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//usage: "\n -m Get baud rate from modem's CONNECT status message"
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//usage: "\n -n Don't prompt for login name"
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//usage: "\n -w Wait for CR or LF before sending /etc/issue"
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//usage: "\n -i Don't display /etc/issue"
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//usage: "\n -f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue"
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//usage: "\n -l LOGIN Invoke LOGIN instead of /bin/login"
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//usage: "\n -t SEC Terminate after SEC if no login name is read"
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//usage: "\n -I INITSTR Send INITSTR before anything else"
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//usage: "\n -H HOST Log HOST into the utmp file as the hostname"
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//usage: "\n"
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//usage: "\nBAUD_RATE of 0 leaves it unchanged"
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static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
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#define F_INITSTRING (1 << 0) /* -I */
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#define F_LOCAL (1 << 1) /* -L */
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#define F_FAKEHOST (1 << 2) /* -H */
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#define F_CUSTISSUE (1 << 3) /* -f */
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#define F_RTSCTS (1 << 4) /* -h */
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#define F_NOISSUE (1 << 5) /* -i */
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#define F_LOGIN (1 << 6) /* -l */
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#define F_PARSE (1 << 7) /* -m */
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#define F_TIMEOUT (1 << 8) /* -t */
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#define F_WAITCRLF (1 << 9) /* -w */
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#define F_NOPROMPT (1 << 10) /* -n */
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/* convert speed string to speed code; return <= 0 on failure */
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static int bcode(const char *s)
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{
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int value = bb_strtou(s, NULL, 10); /* yes, int is intended! */
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if (value < 0) /* bad terminating char, overflow, etc */
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return value;
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return tty_value_to_baud(value);
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}
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/* parse alternate baud rates */
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static void parse_speeds(char *arg)
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{
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char *cp;
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/* NB: at least one iteration is always done */
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debug("entered parse_speeds\n");
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while ((cp = strsep(&arg, ",")) != NULL) {
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G.speeds[G.numspeed] = bcode(cp);
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if (G.speeds[G.numspeed] < 0)
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bb_error_msg_and_die("bad speed: %s", cp);
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/* note: arg "0" turns into speed B0 */
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G.numspeed++;
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if (G.numspeed > MAX_SPEED)
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bb_error_msg_and_die("too many alternate speeds");
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}
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debug("exiting parse_speeds\n");
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}
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/* parse command-line arguments */
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static void parse_args(char **argv)
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{
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char *ts;
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int flags;
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opt_complementary = "-2:t+"; /* at least 2 args; -t N */
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flags = getopt32(argv, opt_string,
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&G.initstring, &G.fakehost, &G.issue,
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&G.login, &G.timeout
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);
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if (flags & F_INITSTRING) {
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G.initstring = xstrdup(G.initstring);
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/* decode \ddd octal codes into chars */
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strcpy_and_process_escape_sequences(G.initstring, G.initstring);
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}
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argv += optind;
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debug("after getopt\n");
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/* We loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
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G.tty = argv[0]; /* tty name */
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ts = argv[1]; /* baud rate(s) */
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if (isdigit(argv[0][0])) {
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/* A number first, assume it's a speed (BSD style) */
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G.tty = ts; /* tty name is in argv[1] */
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ts = argv[0]; /* baud rate(s) */
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}
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parse_speeds(ts);
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applet_name = xasprintf("getty: %s", G.tty);
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if (argv[2])
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xsetenv("TERM", argv[2]);
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debug("exiting parse_args\n");
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}
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/* set up tty as standard input, output, error */
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static void open_tty(void)
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{
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/* Set up new standard input, unless we are given an already opened port */
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if (NOT_LONE_DASH(G.tty)) {
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if (G.tty[0] != '/')
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G.tty = xasprintf("/dev/%s", G.tty); /* will leak it */
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/* Open the tty as standard input */
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debug("open(2)\n");
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close(0);
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xopen(G.tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */
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/* Set proper protections and ownership */
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fchown(0, 0, 0); /* 0:0 */
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fchmod(0, 0620); /* crw--w---- */
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} else {
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/*
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* Standard input should already be connected to an open port. Make
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* sure it is open for read/write.
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*/
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if ((fcntl(0, F_GETFL) & (O_RDWR|O_RDONLY|O_WRONLY)) != O_RDWR)
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bb_error_msg_and_die("stdin is not open for read/write");
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}
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}
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static void set_termios(void)
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{
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if (tcsetattr_stdin_TCSANOW(&G.termios) < 0)
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bb_perror_msg_and_die("tcsetattr");
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}
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/* We manipulate termios this way:
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* - first, we read existing termios settings
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* - termios_init modifies some parts and sets it
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* - auto_baud and/or BREAK processing can set different speed and set termios
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* - termios_final again modifies some parts and sets termios before
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* execing login
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*/
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static void termios_init(int speed)
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{
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/* Try to drain output buffer, with 5 sec timeout.
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* Added on request from users of ~600 baud serial interface
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* with biggish buffer on a 90MHz CPU.
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* They were losing hundreds of bytes of buffered output
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* on tcflush.
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*/
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signal_no_SA_RESTART_empty_mask(SIGALRM, record_signo);
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alarm(5);
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tcdrain(STDIN_FILENO);
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alarm(0);
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signal(SIGALRM, SIG_DFL); /* do not break -t TIMEOUT! */
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/* Flush input and output queues, important for modems! */
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tcflush(STDIN_FILENO, TCIOFLUSH);
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/* Set speed if it wasn't specified as "0" on command line */
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if (speed != B0)
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cfsetspeed(&G.termios, speed);
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/* Initial termios settings: 8-bit characters, raw mode, blocking i/o.
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* Special characters are set after we have read the login name; all
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* reads will be done in raw mode anyway.
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*/
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/* Clear all bits except: */
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G.termios.c_cflag &= (0
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/* 2 stop bits (1 otherwise)
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* Enable parity bit (both on input and output)
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* Odd parity (else even)
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*/
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| CSTOPB | PARENB | PARODD
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#ifdef CMSPAR
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| CMSPAR /* mark or space parity */
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#endif
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| CBAUD /* (output) baud rate */
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#ifdef CBAUDEX
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| CBAUDEX /* (output) baud rate */
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#endif
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#ifdef CIBAUD
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| CIBAUD /* input baud rate */
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#endif
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);
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/* Set: 8 bits; hang up (drop DTR) on last close; enable receive */
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G.termios.c_cflag |= CS8 | HUPCL | CREAD;
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if (option_mask32 & F_LOCAL) {
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/* ignore Carrier Detect pin:
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* opens don't block when CD is low,
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* losing CD doesn't hang up processes whose ctty is this tty
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*/
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G.termios.c_cflag |= CLOCAL;
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}
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#ifdef CRTSCTS
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if (option_mask32 & F_RTSCTS)
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G.termios.c_cflag |= CRTSCTS; /* flow control using RTS/CTS pins */
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#endif
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G.termios.c_iflag = 0;
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G.termios.c_lflag = 0;
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/* non-raw output; add CR to each NL */
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G.termios.c_oflag = OPOST | ONLCR;
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G.termios.c_cc[VMIN] = 1; /* block reads if < 1 char is available */
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G.termios.c_cc[VTIME] = 0; /* no timeout (reads block forever) */
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#ifdef __linux__
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G.termios.c_line = 0;
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#endif
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set_termios();
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debug("term_io 2\n");
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}
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static void termios_final(void)
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{
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/* software flow control on output (stop sending if XOFF is recvd);
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* and on input (send XOFF when buffer is full)
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*/
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G.termios.c_iflag |= IXON | IXOFF;
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if (G.eol == '\r') {
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G.termios.c_iflag |= ICRNL; /* map CR on input to NL */
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}
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/* Other bits in c_iflag:
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* IXANY Any recvd char enables output (any char is also a XON)
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* INPCK Enable parity check
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* IGNPAR Ignore parity errors (drop bad bytes)
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* PARMRK Mark parity errors with 0xff, 0x00 prefix
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* (else bad byte is received as 0x00)
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* ISTRIP Strip parity bit
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* IGNBRK Ignore break condition
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* BRKINT Send SIGINT on break - maybe set this?
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* INLCR Map NL to CR
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* IGNCR Ignore CR
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* ICRNL Map CR to NL
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* IUCLC Map uppercase to lowercase
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* IMAXBEL Echo BEL on input line too long
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* IUTF8 Appears to affect tty's idea of char widths,
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* observed to improve backspacing through Unicode chars
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*/
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/* line buffered input (NL or EOL or EOF chars end a line);
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* recognize INT/QUIT/SUSP chars;
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* echo input chars;
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* echo BS-SP-BS on erase character;
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* echo kill char specially, not as ^c (ECHOKE controls how exactly);
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* erase all input via BS-SP-BS on kill char (else go to next line)
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*/
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G.termios.c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
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/* Other bits in c_lflag:
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* XCASE Map uppercase to \lowercase [tried, doesn't work]
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* ECHONL Echo NL even if ECHO is not set
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* ECHOCTL Echo ctrl chars as ^c (else don't echo) - maybe set this?
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* ECHOPRT On erase, echo erased chars
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* [qwe<BS><BS><BS> input looks like "qwe\ewq/" on screen]
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* NOFLSH Don't flush input buffer after interrupt or quit chars
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* IEXTEN Enable extended functions (??)
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* [glibc says it enables c_cc[LNEXT] "enter literal char"
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* and c_cc[VDISCARD] "toggle discard buffered output" chars]
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* FLUSHO Output being flushed (c_cc[VDISCARD] is in effect)
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* PENDIN Retype pending input at next read or input char
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* (c_cc[VREPRINT] is being processed)
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* TOSTOP Send SIGTTOU for background output
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* (why "stty sane" unsets this bit?)
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*/
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G.termios.c_cc[VINTR] = DEF_INTR;
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G.termios.c_cc[VQUIT] = DEF_QUIT;
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G.termios.c_cc[VEOF] = DEF_EOF;
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G.termios.c_cc[VEOL] = DEF_EOL;
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#ifdef VSWTC
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G.termios.c_cc[VSWTC] = DEF_SWITCH;
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#endif
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#ifdef VSWTCH
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G.termios.c_cc[VSWTCH] = DEF_SWITCH;
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#endif
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G.termios.c_cc[VKILL] = DEF_KILL;
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/* Other control chars:
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* VEOL2
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* VERASE, VWERASE - (word) erase. we may set VERASE in get_logname
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* VREPRINT - reprint current input buffer
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* VLNEXT, VDISCARD, VSTATUS
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* VSUSP, VDSUSP - send (delayed) SIGTSTP
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* VSTART, VSTOP - chars used for IXON/IXOFF
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*/
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set_termios();
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}
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/* extract baud rate from modem status message */
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static void auto_baud(void)
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{
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int nread;
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/*
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* This works only if the modem produces its status code AFTER raising
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* the DCD line, and if the computer is fast enough to set the proper
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* baud rate before the message has gone by. We expect a message of the
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* following format:
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*
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* <junk><number><junk>
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*
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* The number is interpreted as the baud rate of the incoming call. If the
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* modem does not tell us the baud rate within one second, we will keep
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* using the current baud rate. It is advisable to enable BREAK
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* processing (comma-separated list of baud rates) if the processing of
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* modem status messages is enabled.
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*/
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G.termios.c_cc[VMIN] = 0; /* don't block reads (min read is 0 chars) */
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set_termios();
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/*
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* Wait for a while, then read everything the modem has said so far and
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* try to extract the speed of the dial-in call.
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*/
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sleep(1);
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nread = safe_read(STDIN_FILENO, G.line_buf, sizeof(G.line_buf) - 1);
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if (nread > 0) {
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int speed;
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char *bp;
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G.line_buf[nread] = '\0';
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for (bp = G.line_buf; bp < G.line_buf + nread; bp++) {
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if (isdigit(*bp)) {
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speed = bcode(bp);
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if (speed > 0)
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cfsetspeed(&G.termios, speed);
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break;
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}
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}
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}
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/* Restore terminal settings */
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G.termios.c_cc[VMIN] = 1; /* restore to value set by termios_init */
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set_termios();
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}
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/* get user name, establish parity, speed, erase, kill, eol;
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* return NULL on BREAK, logname on success
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*/
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static char *get_logname(void)
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{
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char *bp;
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char c;
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/* Flush pending input (esp. after parsing or switching the baud rate) */
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usleep(100*1000); /* 0.1 sec */
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tcflush(STDIN_FILENO, TCIFLUSH);
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/* Prompt for and read a login name */
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G.line_buf[0] = '\0';
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while (!G.line_buf[0]) {
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/* Write issue file and prompt */
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#ifdef ISSUE
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if (!(option_mask32 & F_NOISSUE))
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print_login_issue(G.issue, G.tty);
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#endif
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print_login_prompt();
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/* Read name, watch for break, parity, erase, kill, end-of-line */
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bp = G.line_buf;
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G.eol = '\0';
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while (1) {
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/* Do not report trivial EINTR/EIO errors */
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errno = EINTR; /* make read of 0 bytes be silent too */
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if (read(STDIN_FILENO, &c, 1) < 1) {
|
|
if (errno == EINTR || errno == EIO)
|
|
exit(EXIT_SUCCESS);
|
|
bb_perror_msg_and_die(bb_msg_read_error);
|
|
}
|
|
|
|
/* BREAK. If we have speeds to try,
|
|
* return NULL (will switch speeds and return here) */
|
|
if (c == '\0' && G.numspeed > 1)
|
|
return NULL;
|
|
|
|
/* Do erase, kill and end-of-line processing */
|
|
switch (c) {
|
|
case '\r':
|
|
case '\n':
|
|
*bp = '\0';
|
|
G.eol = c;
|
|
goto got_logname;
|
|
case BS:
|
|
case DEL:
|
|
G.termios.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('D'):
|
|
exit(EXIT_SUCCESS);
|
|
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 logname is empty */
|
|
|
|
return G.line_buf;
|
|
}
|
|
|
|
int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int getty_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int n;
|
|
pid_t pid;
|
|
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);
|
|
|
|
logmode = LOGMODE_NONE;
|
|
|
|
/* Create new session, lose controlling tty, if any */
|
|
/* docs/ctty.htm says:
|
|
* "This is allowed only when the current process
|
|
* is not a process group leader" - is this a problem? */
|
|
setsid();
|
|
/* 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_sleep = 10;
|
|
msg_eol = "\r\n";
|
|
/* most likely will internally use fd #3 in CLOEXEC mode: */
|
|
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 "-" */
|
|
/* If it's not "-" and not taken yet, it will become our ctty */
|
|
debug("calling open_tty\n");
|
|
open_tty();
|
|
ndelay_off(0);
|
|
debug("duping\n");
|
|
xdup2(0, 1);
|
|
xdup2(0, 2);
|
|
|
|
/*
|
|
* 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.termios) < 0)
|
|
bb_perror_msg_and_die("tcgetattr");
|
|
|
|
pid = getpid();
|
|
#ifdef __linux__
|
|
// FIXME: do we need this? Otherwise "-" case seems to be broken...
|
|
// /* Forcibly make fd 0 our controlling tty, even if another session
|
|
// * has it as a ctty. (Another session loses ctty). */
|
|
// ioctl(STDIN_FILENO, TIOCSCTTY, (void*)1);
|
|
/* Make ourself a foreground process group within our session */
|
|
tcsetpgrp(STDIN_FILENO, pid);
|
|
#endif
|
|
|
|
/* Update the utmp file. This tty is ours now! */
|
|
update_utmp(pid, LOGIN_PROCESS, G.tty, "LOGIN", G.fakehost);
|
|
|
|
/* Initialize the termios settings (raw mode, eight-bit, blocking i/o) */
|
|
debug("calling termios_init\n");
|
|
termios_init(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 */
|
|
alarm(G.timeout); /* if 0, alarm is not set */
|
|
//BUG: death by signal won't restore termios
|
|
|
|
/* 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: termios_init 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.termios, G.speeds[baud_index]);
|
|
set_termios();
|
|
}
|
|
}
|
|
|
|
/* Disable timer */
|
|
alarm(0);
|
|
|
|
/* Finalize the termios settings */
|
|
termios_final();
|
|
|
|
/* Now the newline character should be properly written */
|
|
full_write(STDOUT_FILENO, "\n", 1);
|
|
|
|
/* 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, NULL);
|
|
bb_error_msg_and_die("can't execute '%s'", G.login);
|
|
}
|