[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /* agetty.c - another getty program for Linux. By W. Z. Venema 1989
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[1770] | 3 | * Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
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| 4 | * This program is freely distributable. The entire man-page used to
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| 5 | * be here. Now read the real man-page agetty.8 instead.
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| 6 | *
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| 7 | * option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
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| 8 | *
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| 9 | * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
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| 10 | * - added Native Language Support
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[821] | 11 |
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[1770] | 12 | * 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
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| 13 | * - enable hardware flow control before displaying /etc/issue
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| 14 | *
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| 15 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 16 | *
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| 17 | */
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[821] | 18 |
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[1770] | 19 | #include "libbb.h"
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| 20 | #include <syslog.h>
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[821] | 21 |
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[1770] | 22 | #if ENABLE_FEATURE_UTMP
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[821] | 23 | #include <utmp.h>
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| 24 | #endif
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| 25 |
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[1770] | 26 | /*
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| 27 | * Some heuristics to find out what environment we are in: if it is not
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| 28 | * System V, assume it is SunOS 4.
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| 29 | */
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[821] | 30 | #ifdef LOGIN_PROCESS /* defined in System V utmp.h */
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| 31 | #define SYSV_STYLE /* select System V style getty */
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[1770] | 32 | #include <sys/utsname.h>
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| 33 | #include <time.h>
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| 34 | #if ENABLE_FEATURE_WTMP
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[821] | 35 | extern void updwtmp(const char *filename, const struct utmp *ut);
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[1770] | 36 | static void update_utmp(const char *line);
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[821] | 37 | #endif
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| 38 | #endif /* LOGIN_PROCESS */
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| 39 |
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[1770] | 40 | /*
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| 41 | * Things you may want to modify.
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| 42 | *
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| 43 | * You may disagree with the default line-editing etc. characters defined
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| 44 | * below. Note, however, that DEL cannot be used for interrupt generation
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| 45 | * and for line editing at the same time.
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| 46 | */
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[821] | 47 |
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[1770] | 48 | /* I doubt there are systems which still need this */
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| 49 | #undef HANDLE_ALLCAPS
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[821] | 50 |
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[1770] | 51 | #define _PATH_LOGIN "/bin/login"
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| 52 |
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| 53 | /* If ISSUE is not defined, getty will never display the contents of the
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| 54 | * /etc/issue file. You will not want to spit out large "issue" files at the
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| 55 | * wrong baud rate.
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| 56 | */
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[821] | 57 | #define ISSUE "/etc/issue" /* displayed before the login prompt */
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| 58 |
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| 59 | /* Some shorthands for control characters. */
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| 60 | #define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
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| 61 | #define CR CTL('M') /* carriage return */
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| 62 | #define NL CTL('J') /* line feed */
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| 63 | #define BS CTL('H') /* back space */
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| 64 | #define DEL CTL('?') /* delete */
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| 65 |
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| 66 | /* Defaults for line-editing etc. characters; you may want to change this. */
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| 67 | #define DEF_ERASE DEL /* default erase character */
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| 68 | #define DEF_INTR CTL('C') /* default interrupt character */
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| 69 | #define DEF_QUIT CTL('\\') /* default quit char */
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| 70 | #define DEF_KILL CTL('U') /* default kill char */
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| 71 | #define DEF_EOF CTL('D') /* default EOF char */
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| 72 | #define DEF_EOL '\n'
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| 73 | #define DEF_SWITCH 0 /* default switch char */
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| 74 |
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[1770] | 75 | /*
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| 76 | * When multiple baud rates are specified on the command line, the first one
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| 77 | * we will try is the first one specified.
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| 78 | */
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[821] | 79 | #define FIRST_SPEED 0
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| 80 |
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| 81 | /* Storage for command-line options. */
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| 82 |
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| 83 | #define MAX_SPEED 10 /* max. nr. of baud rates */
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| 84 |
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| 85 | struct options {
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| 86 | int flags; /* toggle switches, see below */
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[1770] | 87 | unsigned timeout; /* time-out period */
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| 88 | const char *login; /* login program */
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| 89 | const char *tty; /* name of tty */
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| 90 | const char *initstring; /* modem init string */
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| 91 | const char *issue; /* alternative issue file */
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[821] | 92 | int numspeed; /* number of baud rates to try */
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| 93 | int speeds[MAX_SPEED]; /* baud rates to be tried */
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| 94 | };
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| 95 |
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[1770] | 96 | static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
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[821] | 97 | #define F_INITSTRING (1<<0) /* initstring is set */
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| 98 | #define F_LOCAL (1<<1) /* force local */
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| 99 | #define F_FAKEHOST (1<<2) /* force fakehost */
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| 100 | #define F_CUSTISSUE (1<<3) /* give alternative issue file */
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| 101 | #define F_RTSCTS (1<<4) /* enable RTS/CTS flow control */
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| 102 | #define F_ISSUE (1<<5) /* display /etc/issue */
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| 103 | #define F_LOGIN (1<<6) /* non-default login program */
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| 104 | #define F_PARSE (1<<7) /* process modem status messages */
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| 105 | #define F_TIMEOUT (1<<8) /* time out */
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| 106 | #define F_WAITCRLF (1<<9) /* wait for CR or LF */
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| 107 | #define F_NOPROMPT (1<<10) /* don't ask for login name! */
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| 108 |
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| 109 | /* Storage for things detected while the login name was read. */
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| 110 | struct chardata {
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[1770] | 111 | unsigned char erase; /* erase character */
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| 112 | unsigned char kill; /* kill character */
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| 113 | unsigned char eol; /* end-of-line character */
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| 114 | unsigned char parity; /* what parity did we see */
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| 115 | #ifdef HANDLE_ALLCAPS
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| 116 | unsigned char capslock; /* upper case without lower case */
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| 117 | #endif
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[821] | 118 | };
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| 119 |
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| 120 | /* Initial values for the above. */
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[1770] | 121 | static const struct chardata init_chardata = {
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[821] | 122 | DEF_ERASE, /* default erase character */
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| 123 | DEF_KILL, /* default kill character */
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| 124 | 13, /* default eol char */
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| 125 | 0, /* space parity */
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[1770] | 126 | #ifdef HANDLE_ALLCAPS
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[821] | 127 | 0, /* no capslock */
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| 128 | #endif
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| 129 | };
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| 130 |
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| 131 | /* The following is used for understandable diagnostics. */
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| 132 |
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| 133 | /* Fake hostname for ut_host specified on command line. */
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| 134 | static char *fakehost = NULL;
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| 135 |
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| 136 | /* ... */
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| 137 | #ifdef DEBUGGING
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| 138 | #define debug(s) fprintf(dbf,s); fflush(dbf)
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| 139 | #define DEBUGTERM "/dev/ttyp0"
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[1770] | 140 | static FILE *dbf;
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[821] | 141 | #else
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[1770] | 142 | #define debug(s) /* nothing */
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[821] | 143 | #endif
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| 144 |
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| 145 |
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| 146 | /* bcode - convert speed string to speed code; return 0 on failure */
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| 147 | static int bcode(const char *s)
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| 148 | {
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| 149 | int r;
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[1770] | 150 | unsigned value = bb_strtou(s, NULL, 10);
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| 151 | if (errno) {
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[821] | 152 | return -1;
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| 153 | }
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[1770] | 154 | r = tty_value_to_baud(value);
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| 155 | if (r > 0) {
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[821] | 156 | return r;
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| 157 | }
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| 158 | return 0;
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| 159 | }
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| 160 |
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| 161 |
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| 162 | /* parse_speeds - parse alternate baud rates */
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| 163 | static void parse_speeds(struct options *op, char *arg)
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| 164 | {
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| 165 | char *cp;
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| 166 |
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| 167 | debug("entered parse_speeds\n");
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| 168 | for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
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| 169 | if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
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[1770] | 170 | bb_error_msg_and_die("bad speed: %s", cp);
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[821] | 171 | if (op->numspeed > MAX_SPEED)
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[1770] | 172 | bb_error_msg_and_die("too many alternate speeds");
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[821] | 173 | }
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| 174 | debug("exiting parsespeeds\n");
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| 175 | }
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| 176 |
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| 177 |
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[1770] | 178 | /* parse_args - parse command-line arguments */
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[821] | 179 | static void parse_args(int argc, char **argv, struct options *op)
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| 180 | {
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| 181 | char *ts;
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| 182 |
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[1770] | 183 | op->flags = getopt32(argv, opt_string,
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[821] | 184 | &(op->initstring), &fakehost, &(op->issue),
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| 185 | &(op->login), &ts);
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[1770] | 186 | if (op->flags & F_INITSTRING) {
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[821] | 187 | const char *p = op->initstring;
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| 188 | char *q;
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| 189 |
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[1770] | 190 | op->initstring = q = xstrdup(op->initstring);
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[821] | 191 | /* copy optarg into op->initstring decoding \ddd
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| 192 | octal codes into chars */
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| 193 | while (*p) {
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| 194 | if (*p == '\\') {
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| 195 | p++;
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| 196 | *q++ = bb_process_escape_sequence(&p);
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| 197 | } else {
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| 198 | *q++ = *p++;
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| 199 | }
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| 200 | }
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| 201 | *q = '\0';
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| 202 | }
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| 203 | op->flags ^= F_ISSUE; /* revert flag show /etc/issue */
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[1770] | 204 | if (op->flags & F_TIMEOUT) {
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| 205 | op->timeout = xatoul_range(ts, 1, INT_MAX);
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[821] | 206 | }
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[1770] | 207 | argv += optind;
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| 208 | argc -= optind;
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[821] | 209 | debug("after getopt loop\n");
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[1770] | 210 | if (argc < 2) /* check parameter count */
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[821] | 211 | bb_show_usage();
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| 212 |
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| 213 | /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
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[1770] | 214 | if (isdigit(argv[0][0])) {
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[821] | 215 | /* a number first, assume it's a speed (BSD style) */
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[1770] | 216 | parse_speeds(op, argv[0]); /* baud rate(s) */
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| 217 | op->tty = argv[1]; /* tty name */
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[821] | 218 | } else {
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[1770] | 219 | op->tty = argv[0]; /* tty name */
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| 220 | parse_speeds(op, argv[1]); /* baud rate(s) */
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[821] | 221 | }
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| 222 |
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[1770] | 223 | if (argv[2])
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| 224 | setenv("TERM", argv[2], 1);
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[821] | 225 |
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| 226 | debug("exiting parseargs\n");
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| 227 | }
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| 228 |
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| 229 | /* open_tty - set up tty as standard { input, output, error } */
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[1770] | 230 | static void open_tty(const char *tty, struct termios *tp, int local)
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[821] | 231 | {
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| 232 | int chdir_to_root = 0;
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| 233 |
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| 234 | /* Set up new standard input, unless we are given an already opened port. */
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[1770] | 235 | if (NOT_LONE_DASH(tty)) {
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[821] | 236 | struct stat st;
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| 237 | int fd;
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| 238 |
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| 239 | /* Sanity checks... */
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[1770] | 240 | xchdir("/dev");
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[821] | 241 | chdir_to_root = 1;
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[1770] | 242 | xstat(tty, &st);
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[821] | 243 | if ((st.st_mode & S_IFMT) != S_IFCHR)
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[1770] | 244 | bb_error_msg_and_die("%s: not a character device", tty);
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[821] | 245 |
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| 246 | /* Open the tty as standard input. */
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| 247 | debug("open(2)\n");
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[1770] | 248 | fd = xopen(tty, O_RDWR | O_NONBLOCK);
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| 249 | xdup2(fd, 0);
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| 250 | while (fd > 2)
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| 251 | close(fd--);
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[821] | 252 | } else {
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| 253 | /*
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| 254 | * Standard input should already be connected to an open port. Make
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| 255 | * sure it is open for read/write.
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| 256 | */
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[1770] | 257 | if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
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| 258 | bb_error_msg_and_die("stdin is not open for read/write");
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[821] | 259 | }
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| 260 |
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| 261 | /* Replace current standard output/error fd's with new ones */
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| 262 | debug("duping\n");
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[1770] | 263 | xdup2(0, 1);
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| 264 | xdup2(0, 2);
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[821] | 265 |
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| 266 | /*
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| 267 | * The following ioctl will fail if stdin is not a tty, but also when
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| 268 | * there is noise on the modem control lines. In the latter case, the
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| 269 | * common course of action is (1) fix your cables (2) give the modem more
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| 270 | * time to properly reset after hanging up. SunOS users can achieve (2)
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| 271 | * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
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| 272 | * 5 seconds seems to be a good value.
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| 273 | */
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[1770] | 274 | ioctl_or_perror_and_die(0, TCGETS, tp, "%s: TCGETS", tty);
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[821] | 275 |
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| 276 | /*
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| 277 | * It seems to be a terminal. Set proper protections and ownership. Mode
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| 278 | * 0622 is suitable for SYSV <4 because /bin/login does not change
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| 279 | * protections. SunOS 4 login will change the protections to 0620 (write
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| 280 | * access for group tty) after the login has succeeded.
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| 281 | */
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| 282 |
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| 283 | #ifdef DEBIAN
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[1770] | 284 | #warning Debian /dev/vcs[a]NN hack is deprecated and will be removed
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[821] | 285 | {
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| 286 | /* tty to root.dialout 660 */
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| 287 | struct group *gr;
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| 288 | int id;
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| 289 |
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[1770] | 290 | gr = getgrnam("dialout");
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| 291 | id = gr ? gr->gr_gid : 0;
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[821] | 292 | chown(tty, 0, id);
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| 293 | chmod(tty, 0660);
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| 294 |
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| 295 | /* vcs,vcsa to root.sys 600 */
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| 296 | if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
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| 297 | char *vcs, *vcsa;
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| 298 |
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[1770] | 299 | vcs = xstrdup(tty);
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| 300 | vcsa = xmalloc(strlen(tty) + 2);
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[821] | 301 | strcpy(vcs, "vcs");
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| 302 | strcpy(vcs + 3, tty + 3);
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| 303 | strcpy(vcsa, "vcsa");
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| 304 | strcpy(vcsa + 4, tty + 3);
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| 305 |
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[1770] | 306 | gr = getgrnam("sys");
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| 307 | id = gr ? gr->gr_gid : 0;
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[821] | 308 | chown(vcs, 0, id);
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| 309 | chmod(vcs, 0600);
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| 310 | chown(vcsa, 0, id);
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| 311 | chmod(vcs, 0600);
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| 312 |
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| 313 | free(vcs);
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| 314 | free(vcsa);
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| 315 | }
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| 316 | }
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| 317 | #else
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[1770] | 318 | if (NOT_LONE_DASH(tty)) {
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| 319 | chown(tty, 0, 0); /* 0:0 */
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| 320 | chmod(tty, 0622); /* crw--w--w- */
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| 321 | }
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[821] | 322 | #endif
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[1770] | 323 | if (chdir_to_root)
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| 324 | xchdir("/");
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[821] | 325 | }
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| 326 |
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[1770] | 327 | /* termios_init - initialize termios settings */
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| 328 | static void termios_init(struct termios *tp, int speed, struct options *op)
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[821] | 329 | {
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| 330 | /*
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[1770] | 331 | * Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
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[821] | 332 | * Special characters are set after we have read the login name; all
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| 333 | * reads will be done in raw mode anyway. Errors will be dealt with
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[1770] | 334 | * later on.
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[821] | 335 | */
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| 336 | #ifdef __linux__
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| 337 | /* flush input and output queues, important for modems! */
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[1770] | 338 | ioctl(0, TCFLSH, TCIOFLUSH);
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[821] | 339 | #endif
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| 340 |
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| 341 | tp->c_cflag = CS8 | HUPCL | CREAD | speed;
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| 342 | if (op->flags & F_LOCAL) {
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| 343 | tp->c_cflag |= CLOCAL;
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| 344 | }
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| 345 |
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[902] | 346 | tp->c_iflag = tp->c_lflag = tp->c_line = 0;
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| 347 | tp->c_oflag = OPOST | ONLCR;
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[821] | 348 | tp->c_cc[VMIN] = 1;
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| 349 | tp->c_cc[VTIME] = 0;
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| 350 |
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| 351 | /* Optionally enable hardware flow control */
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| 352 |
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| 353 | #ifdef CRTSCTS
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| 354 | if (op->flags & F_RTSCTS)
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| 355 | tp->c_cflag |= CRTSCTS;
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| 356 | #endif
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| 357 |
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[1770] | 358 | ioctl(0, TCSETS, tp);
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[821] | 359 |
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| 360 | /* go to blocking input even in local mode */
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[1770] | 361 | ndelay_off(0);
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[821] | 362 |
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| 363 | debug("term_io 2\n");
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| 364 | }
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| 365 |
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| 366 | /* auto_baud - extract baud rate from modem status message */
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[1770] | 367 | static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
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[821] | 368 | {
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| 369 | int speed;
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| 370 | int vmin;
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| 371 | unsigned iflag;
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| 372 | char *bp;
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| 373 | int nread;
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| 374 |
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| 375 | /*
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| 376 | * This works only if the modem produces its status code AFTER raising
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| 377 | * the DCD line, and if the computer is fast enough to set the proper
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| 378 | * baud rate before the message has gone by. We expect a message of the
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| 379 | * following format:
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| 380 | *
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| 381 | * <junk><number><junk>
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| 382 | *
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| 383 | * The number is interpreted as the baud rate of the incoming call. If the
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| 384 | * modem does not tell us the baud rate within one second, we will keep
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| 385 | * using the current baud rate. It is advisable to enable BREAK
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| 386 | * processing (comma-separated list of baud rates) if the processing of
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| 387 | * modem status messages is enabled.
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| 388 | */
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| 389 |
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| 390 | /*
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| 391 | * Use 7-bit characters, don't block if input queue is empty. Errors will
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[1770] | 392 | * be dealt with later on.
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[821] | 393 | */
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| 394 |
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| 395 | iflag = tp->c_iflag;
|
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| 396 | tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
|
---|
| 397 | vmin = tp->c_cc[VMIN];
|
---|
| 398 | tp->c_cc[VMIN] = 0; /* don't block if queue empty */
|
---|
[1770] | 399 | ioctl(0, TCSETS, tp);
|
---|
[821] | 400 |
|
---|
| 401 | /*
|
---|
| 402 | * Wait for a while, then read everything the modem has said so far and
|
---|
| 403 | * try to extract the speed of the dial-in call.
|
---|
| 404 | */
|
---|
| 405 |
|
---|
[1770] | 406 | sleep(1);
|
---|
| 407 | nread = read(0, buf, size_buf - 1);
|
---|
| 408 | if (nread > 0) {
|
---|
[821] | 409 | buf[nread] = '\0';
|
---|
| 410 | for (bp = buf; bp < buf + nread; bp++) {
|
---|
| 411 | if (isascii(*bp) && isdigit(*bp)) {
|
---|
[1770] | 412 | speed = bcode(bp);
|
---|
| 413 | if (speed) {
|
---|
[821] | 414 | tp->c_cflag &= ~CBAUD;
|
---|
| 415 | tp->c_cflag |= speed;
|
---|
| 416 | }
|
---|
| 417 | break;
|
---|
| 418 | }
|
---|
| 419 | }
|
---|
| 420 | }
|
---|
[1770] | 421 | /* Restore terminal settings. Errors will be dealt with later on. */
|
---|
[821] | 422 |
|
---|
| 423 | tp->c_iflag = iflag;
|
---|
| 424 | tp->c_cc[VMIN] = vmin;
|
---|
[1770] | 425 | ioctl(0, TCSETS, tp);
|
---|
[821] | 426 | }
|
---|
| 427 |
|
---|
| 428 | /* next_speed - select next baud rate */
|
---|
[1770] | 429 | static void next_speed(struct termios *tp, struct options *op)
|
---|
[821] | 430 | {
|
---|
| 431 | static int baud_index = FIRST_SPEED; /* current speed index */
|
---|
| 432 |
|
---|
| 433 | baud_index = (baud_index + 1) % op->numspeed;
|
---|
| 434 | tp->c_cflag &= ~CBAUD;
|
---|
| 435 | tp->c_cflag |= op->speeds[baud_index];
|
---|
[1770] | 436 | ioctl(0, TCSETS, tp);
|
---|
[821] | 437 | }
|
---|
| 438 |
|
---|
| 439 |
|
---|
| 440 | /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
|
---|
[1770] | 441 | static void do_prompt(struct options *op, struct termios *tp)
|
---|
[821] | 442 | {
|
---|
[1770] | 443 | #ifdef ISSUE
|
---|
[821] | 444 | print_login_issue(op->issue, op->tty);
|
---|
| 445 | #endif
|
---|
| 446 | print_login_prompt();
|
---|
| 447 | }
|
---|
| 448 |
|
---|
[1770] | 449 | #ifdef HANDLE_ALLCAPS
|
---|
[821] | 450 | /* caps_lock - string contains upper case without lower case */
|
---|
| 451 | /* returns 1 if true, 0 if false */
|
---|
| 452 | static int caps_lock(const char *s)
|
---|
| 453 | {
|
---|
[1770] | 454 | while (*s)
|
---|
| 455 | if (islower(*s++))
|
---|
| 456 | return 0;
|
---|
| 457 | return 1;
|
---|
[821] | 458 | }
|
---|
[1770] | 459 | #endif
|
---|
[821] | 460 |
|
---|
| 461 | /* get_logname - get user name, establish parity, speed, erase, kill, eol */
|
---|
| 462 | /* return NULL on failure, logname on success */
|
---|
[1770] | 463 | static char *get_logname(char *logname, unsigned size_logname,
|
---|
| 464 | struct options *op, struct chardata *cp, struct termios *tp)
|
---|
[821] | 465 | {
|
---|
| 466 | char *bp;
|
---|
| 467 | char c; /* input character, full eight bits */
|
---|
| 468 | char ascval; /* low 7 bits of input character */
|
---|
| 469 | int bits; /* # of "1" bits per character */
|
---|
| 470 | int mask; /* mask with 1 bit up */
|
---|
[1770] | 471 | static const char erase[][3] = { /* backspace-space-backspace */
|
---|
[821] | 472 | "\010\040\010", /* space parity */
|
---|
| 473 | "\010\040\010", /* odd parity */
|
---|
| 474 | "\210\240\210", /* even parity */
|
---|
| 475 | "\210\240\210", /* no parity */
|
---|
| 476 | };
|
---|
| 477 |
|
---|
| 478 | /* Initialize kill, erase, parity etc. (also after switching speeds). */
|
---|
| 479 |
|
---|
| 480 | *cp = init_chardata;
|
---|
| 481 |
|
---|
| 482 | /* Flush pending input (esp. after parsing or switching the baud rate). */
|
---|
| 483 |
|
---|
[1770] | 484 | sleep(1);
|
---|
| 485 | ioctl(0, TCFLSH, TCIFLUSH);
|
---|
[821] | 486 |
|
---|
| 487 | /* Prompt for and read a login name. */
|
---|
| 488 |
|
---|
[1770] | 489 | logname[0] = '\0';
|
---|
| 490 | while (!logname[0]) {
|
---|
[821] | 491 |
|
---|
| 492 | /* Write issue file and prompt, with "parity" bit == 0. */
|
---|
| 493 |
|
---|
| 494 | do_prompt(op, tp);
|
---|
| 495 |
|
---|
| 496 | /* Read name, watch for break, parity, erase, kill, end-of-line. */
|
---|
| 497 |
|
---|
[1770] | 498 | bp = logname;
|
---|
| 499 | cp->eol = '\0';
|
---|
| 500 | while (cp->eol == '\0') {
|
---|
[821] | 501 |
|
---|
| 502 | /* Do not report trivial EINTR/EIO errors. */
|
---|
| 503 | if (read(0, &c, 1) < 1) {
|
---|
| 504 | if (errno == EINTR || errno == EIO)
|
---|
| 505 | exit(0);
|
---|
[1770] | 506 | bb_perror_msg_and_die("%s: read", op->tty);
|
---|
[821] | 507 | }
|
---|
[1770] | 508 |
|
---|
[821] | 509 | /* Do BREAK handling elsewhere. */
|
---|
[1770] | 510 | if (c == '\0' && op->numspeed > 1)
|
---|
[821] | 511 | return NULL;
|
---|
| 512 |
|
---|
| 513 | /* Do parity bit handling. */
|
---|
[1770] | 514 | ascval = c & 0177;
|
---|
| 515 | if (c != ascval) { /* "parity" bit on ? */
|
---|
| 516 | bits = 1;
|
---|
| 517 | mask = 1;
|
---|
| 518 | while (mask & 0177) {
|
---|
[821] | 519 | if (mask & ascval)
|
---|
| 520 | bits++; /* count "1" bits */
|
---|
[1770] | 521 | mask <<= 1;
|
---|
| 522 | }
|
---|
| 523 | /* ... |= 2 - even, 1 - odd */
|
---|
| 524 | cp->parity |= 2 - (bits & 1);
|
---|
[821] | 525 | }
|
---|
[1770] | 526 |
|
---|
[821] | 527 | /* Do erase, kill and end-of-line processing. */
|
---|
| 528 | switch (ascval) {
|
---|
| 529 | case CR:
|
---|
| 530 | case NL:
|
---|
[1770] | 531 | *bp = '\0'; /* terminate logname */
|
---|
[821] | 532 | cp->eol = ascval; /* set end-of-line char */
|
---|
| 533 | break;
|
---|
| 534 | case BS:
|
---|
| 535 | case DEL:
|
---|
| 536 | case '#':
|
---|
| 537 | cp->erase = ascval; /* set erase character */
|
---|
| 538 | if (bp > logname) {
|
---|
[1770] | 539 | write(1, erase[cp->parity], 3);
|
---|
[821] | 540 | bp--;
|
---|
| 541 | }
|
---|
| 542 | break;
|
---|
| 543 | case CTL('U'):
|
---|
| 544 | case '@':
|
---|
| 545 | cp->kill = ascval; /* set kill character */
|
---|
| 546 | while (bp > logname) {
|
---|
[1770] | 547 | write(1, erase[cp->parity], 3);
|
---|
[821] | 548 | bp--;
|
---|
| 549 | }
|
---|
| 550 | break;
|
---|
| 551 | case CTL('D'):
|
---|
| 552 | exit(0);
|
---|
| 553 | default:
|
---|
| 554 | if (!isascii(ascval) || !isprint(ascval)) {
|
---|
[1770] | 555 | /* ignore garbage characters */
|
---|
| 556 | } else if (bp - logname >= size_logname - 1) {
|
---|
| 557 | bb_error_msg_and_die("%s: input overrun", op->tty);
|
---|
[821] | 558 | } else {
|
---|
[1770] | 559 | write(1, &c, 1); /* echo the character */
|
---|
[821] | 560 | *bp++ = ascval; /* and store it */
|
---|
| 561 | }
|
---|
| 562 | break;
|
---|
| 563 | }
|
---|
| 564 | }
|
---|
| 565 | }
|
---|
| 566 | /* Handle names with upper case and no lower case. */
|
---|
| 567 |
|
---|
[1770] | 568 | #ifdef HANDLE_ALLCAPS
|
---|
| 569 | cp->capslock = caps_lock(logname);
|
---|
| 570 | if (cp->capslock) {
|
---|
[821] | 571 | for (bp = logname; *bp; bp++)
|
---|
| 572 | if (isupper(*bp))
|
---|
| 573 | *bp = tolower(*bp); /* map name to lower case */
|
---|
| 574 | }
|
---|
[1770] | 575 | #endif
|
---|
| 576 | return logname;
|
---|
[821] | 577 | }
|
---|
| 578 |
|
---|
[1770] | 579 | /* termios_final - set the final tty mode bits */
|
---|
| 580 | static void termios_final(struct options *op, struct termios *tp, struct chardata *cp)
|
---|
[821] | 581 | {
|
---|
| 582 | /* General terminal-independent stuff. */
|
---|
| 583 |
|
---|
| 584 | tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
|
---|
| 585 | tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
|
---|
| 586 | /* no longer| ECHOCTL | ECHOPRT */
|
---|
| 587 | tp->c_oflag |= OPOST;
|
---|
| 588 | /* tp->c_cflag = 0; */
|
---|
| 589 | tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
|
---|
| 590 | tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
|
---|
| 591 | tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
|
---|
| 592 | tp->c_cc[VEOL] = DEF_EOL;
|
---|
| 593 | tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
|
---|
| 594 |
|
---|
| 595 | /* Account for special characters seen in input. */
|
---|
| 596 |
|
---|
| 597 | if (cp->eol == CR) {
|
---|
| 598 | tp->c_iflag |= ICRNL; /* map CR in input to NL */
|
---|
| 599 | tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
|
---|
| 600 | }
|
---|
| 601 | tp->c_cc[VERASE] = cp->erase; /* set erase character */
|
---|
| 602 | tp->c_cc[VKILL] = cp->kill; /* set kill character */
|
---|
| 603 |
|
---|
| 604 | /* Account for the presence or absence of parity bits in input. */
|
---|
| 605 |
|
---|
| 606 | switch (cp->parity) {
|
---|
| 607 | case 0: /* space (always 0) parity */
|
---|
| 608 | break;
|
---|
| 609 | case 1: /* odd parity */
|
---|
| 610 | tp->c_cflag |= PARODD;
|
---|
| 611 | /* FALLTHROUGH */
|
---|
| 612 | case 2: /* even parity */
|
---|
| 613 | tp->c_cflag |= PARENB;
|
---|
| 614 | tp->c_iflag |= INPCK | ISTRIP;
|
---|
| 615 | /* FALLTHROUGH */
|
---|
| 616 | case (1 | 2): /* no parity bit */
|
---|
| 617 | tp->c_cflag &= ~CSIZE;
|
---|
| 618 | tp->c_cflag |= CS7;
|
---|
| 619 | break;
|
---|
| 620 | }
|
---|
[1770] | 621 |
|
---|
[821] | 622 | /* Account for upper case without lower case. */
|
---|
[1770] | 623 | #ifdef HANDLE_ALLCAPS
|
---|
[821] | 624 | if (cp->capslock) {
|
---|
| 625 | tp->c_iflag |= IUCLC;
|
---|
| 626 | tp->c_lflag |= XCASE;
|
---|
| 627 | tp->c_oflag |= OLCUC;
|
---|
| 628 | }
|
---|
[1770] | 629 | #endif
|
---|
[821] | 630 | /* Optionally enable hardware flow control */
|
---|
| 631 |
|
---|
| 632 | #ifdef CRTSCTS
|
---|
| 633 | if (op->flags & F_RTSCTS)
|
---|
| 634 | tp->c_cflag |= CRTSCTS;
|
---|
| 635 | #endif
|
---|
| 636 |
|
---|
| 637 | /* Finally, make the new settings effective */
|
---|
| 638 |
|
---|
[1770] | 639 | ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
|
---|
[821] | 640 | }
|
---|
| 641 |
|
---|
| 642 |
|
---|
[1770] | 643 | #ifdef SYSV_STYLE
|
---|
| 644 | #if ENABLE_FEATURE_UTMP
|
---|
[821] | 645 | /* update_utmp - update our utmp entry */
|
---|
[1770] | 646 | static void update_utmp(const char *line)
|
---|
[821] | 647 | {
|
---|
| 648 | struct utmp ut;
|
---|
| 649 | struct utmp *utp;
|
---|
| 650 | time_t t;
|
---|
| 651 | int mypid = getpid();
|
---|
| 652 |
|
---|
| 653 | /*
|
---|
| 654 | * The utmp file holds miscellaneous information about things started by
|
---|
| 655 | * /sbin/init and other system-related events. Our purpose is to update
|
---|
| 656 | * the utmp entry for the current process, in particular the process type
|
---|
| 657 | * and the tty line we are listening to. Return successfully only if the
|
---|
| 658 | * utmp file can be opened for update, and if we are able to find our
|
---|
| 659 | * entry in the utmp file.
|
---|
| 660 | */
|
---|
| 661 | if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
|
---|
| 662 | close(creat(_PATH_UTMP, 0664));
|
---|
| 663 | }
|
---|
| 664 | utmpname(_PATH_UTMP);
|
---|
| 665 | setutent();
|
---|
| 666 | while ((utp = getutent())
|
---|
[1770] | 667 | && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid))
|
---|
| 668 | /* nothing */;
|
---|
[821] | 669 |
|
---|
| 670 | if (utp) {
|
---|
| 671 | memcpy(&ut, utp, sizeof(ut));
|
---|
| 672 | } else {
|
---|
| 673 | /* some inits don't initialize utmp... */
|
---|
| 674 | memset(&ut, 0, sizeof(ut));
|
---|
| 675 | safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
|
---|
| 676 | }
|
---|
[1770] | 677 | /* endutent(); */
|
---|
[821] | 678 |
|
---|
| 679 | strcpy(ut.ut_user, "LOGIN");
|
---|
| 680 | safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
|
---|
| 681 | if (fakehost)
|
---|
| 682 | safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
|
---|
| 683 | time(&t);
|
---|
| 684 | ut.ut_time = t;
|
---|
| 685 | ut.ut_type = LOGIN_PROCESS;
|
---|
| 686 | ut.ut_pid = mypid;
|
---|
| 687 |
|
---|
| 688 | pututline(&ut);
|
---|
| 689 | endutent();
|
---|
| 690 |
|
---|
[1770] | 691 | #if ENABLE_FEATURE_WTMP
|
---|
[821] | 692 | if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
|
---|
| 693 | close(creat(bb_path_wtmp_file, 0664));
|
---|
| 694 | updwtmp(bb_path_wtmp_file, &ut);
|
---|
| 695 | #endif
|
---|
| 696 | }
|
---|
| 697 |
|
---|
| 698 | #endif /* CONFIG_FEATURE_UTMP */
|
---|
| 699 | #endif /* SYSV_STYLE */
|
---|
| 700 |
|
---|
| 701 |
|
---|
[1770] | 702 | int getty_main(int argc, char **argv);
|
---|
[821] | 703 | int getty_main(int argc, char **argv)
|
---|
| 704 | {
|
---|
[1770] | 705 | int nullfd;
|
---|
[821] | 706 | char *logname = NULL; /* login name, given to /bin/login */
|
---|
[1770] | 707 | /* Merging these into "struct local" may _seem_ to reduce
|
---|
| 708 | * parameter passing, but today's gcc will inline
|
---|
| 709 | * statics which are called once anyway, so don't do that */
|
---|
[821] | 710 | struct chardata chardata; /* set by get_logname() */
|
---|
[1770] | 711 | struct termios termios; /* terminal mode bits */
|
---|
| 712 | struct options options = {
|
---|
[821] | 713 | 0, /* show /etc/issue (SYSV_STYLE) */
|
---|
| 714 | 0, /* no timeout */
|
---|
| 715 | _PATH_LOGIN, /* default login program */
|
---|
| 716 | "tty1", /* default tty line */
|
---|
| 717 | "", /* modem init string */
|
---|
| 718 | #ifdef ISSUE
|
---|
| 719 | ISSUE, /* default issue file */
|
---|
| 720 | #else
|
---|
| 721 | NULL,
|
---|
| 722 | #endif
|
---|
| 723 | 0, /* no baud rates known yet */
|
---|
| 724 | };
|
---|
| 725 |
|
---|
[1770] | 726 | /* Already too late because of theoretical
|
---|
| 727 | * possibility of getty --help somehow triggered
|
---|
| 728 | * inadvertently before we reach this. Oh well. */
|
---|
| 729 | logmode = LOGMODE_NONE;
|
---|
| 730 | setsid();
|
---|
| 731 | nullfd = xopen(bb_dev_null, O_RDWR);
|
---|
| 732 | /* dup2(nullfd, 0); - no, because of possible "getty - 9600" */
|
---|
| 733 | /* open_tty() will take care of fd# 0 anyway */
|
---|
| 734 | dup2(nullfd, 1);
|
---|
| 735 | dup2(nullfd, 2);
|
---|
| 736 | while (nullfd > 2) close(nullfd--);
|
---|
| 737 | /* We want special flavor of error_msg_and_die */
|
---|
| 738 | die_sleep = 10;
|
---|
| 739 | msg_eol = "\r\n";
|
---|
| 740 | openlog(applet_name, LOG_PID, LOG_AUTH);
|
---|
| 741 | logmode = LOGMODE_BOTH;
|
---|
| 742 |
|
---|
[821] | 743 | #ifdef DEBUGGING
|
---|
[1770] | 744 | dbf = xfopen(DEBUGTERM, "w");
|
---|
[821] | 745 |
|
---|
| 746 | {
|
---|
| 747 | int i;
|
---|
| 748 |
|
---|
| 749 | for (i = 1; i < argc; i++) {
|
---|
| 750 | debug(argv[i]);
|
---|
| 751 | debug("\n");
|
---|
| 752 | }
|
---|
| 753 | }
|
---|
| 754 | #endif
|
---|
| 755 |
|
---|
| 756 | /* Parse command-line arguments. */
|
---|
| 757 | parse_args(argc, argv, &options);
|
---|
| 758 |
|
---|
[1770] | 759 | #ifdef SYSV_STYLE
|
---|
| 760 | #if ENABLE_FEATURE_UTMP
|
---|
[821] | 761 | /* Update the utmp file. */
|
---|
| 762 | update_utmp(options.tty);
|
---|
| 763 | #endif
|
---|
| 764 | #endif
|
---|
| 765 |
|
---|
| 766 | debug("calling open_tty\n");
|
---|
| 767 | /* Open the tty as standard { input, output, error }. */
|
---|
[1770] | 768 | open_tty(options.tty, &termios, options.flags & F_LOCAL);
|
---|
[821] | 769 |
|
---|
| 770 | #ifdef __linux__
|
---|
| 771 | {
|
---|
| 772 | int iv;
|
---|
| 773 |
|
---|
| 774 | iv = getpid();
|
---|
| 775 | ioctl(0, TIOCSPGRP, &iv);
|
---|
| 776 | }
|
---|
| 777 | #endif
|
---|
[1770] | 778 | /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
|
---|
| 779 | debug("calling termios_init\n");
|
---|
| 780 | termios_init(&termios, options.speeds[FIRST_SPEED], &options);
|
---|
[821] | 781 |
|
---|
| 782 | /* write the modem init string and DON'T flush the buffers */
|
---|
| 783 | if (options.flags & F_INITSTRING) {
|
---|
| 784 | debug("writing init string\n");
|
---|
| 785 | write(1, options.initstring, strlen(options.initstring));
|
---|
| 786 | }
|
---|
| 787 |
|
---|
| 788 | if (!(options.flags & F_LOCAL)) {
|
---|
| 789 | /* go to blocking write mode unless -L is specified */
|
---|
[1770] | 790 | ndelay_off(1);
|
---|
[821] | 791 | }
|
---|
| 792 |
|
---|
| 793 | /* Optionally detect the baud rate from the modem status message. */
|
---|
| 794 | debug("before autobaud\n");
|
---|
| 795 | if (options.flags & F_PARSE)
|
---|
[1770] | 796 | auto_baud(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termios);
|
---|
[821] | 797 |
|
---|
| 798 | /* Set the optional timer. */
|
---|
| 799 | if (options.timeout)
|
---|
[1770] | 800 | alarm(options.timeout);
|
---|
[821] | 801 |
|
---|
| 802 | /* optionally wait for CR or LF before writing /etc/issue */
|
---|
| 803 | if (options.flags & F_WAITCRLF) {
|
---|
| 804 | char ch;
|
---|
| 805 |
|
---|
| 806 | debug("waiting for cr-lf\n");
|
---|
| 807 | while (read(0, &ch, 1) == 1) {
|
---|
| 808 | ch &= 0x7f; /* strip "parity bit" */
|
---|
| 809 | #ifdef DEBUGGING
|
---|
| 810 | fprintf(dbf, "read %c\n", ch);
|
---|
| 811 | #endif
|
---|
| 812 | if (ch == '\n' || ch == '\r')
|
---|
| 813 | break;
|
---|
| 814 | }
|
---|
| 815 | }
|
---|
| 816 |
|
---|
| 817 | chardata = init_chardata;
|
---|
| 818 | if (!(options.flags & F_NOPROMPT)) {
|
---|
| 819 | /* Read the login name. */
|
---|
| 820 | debug("reading login name\n");
|
---|
[1770] | 821 | logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
|
---|
| 822 | &options, &chardata, &termios);
|
---|
| 823 | while (logname == NULL)
|
---|
| 824 | next_speed(&termios, &options);
|
---|
[821] | 825 | }
|
---|
| 826 |
|
---|
| 827 | /* Disable timer. */
|
---|
| 828 |
|
---|
| 829 | if (options.timeout)
|
---|
[1770] | 830 | alarm(0);
|
---|
[821] | 831 |
|
---|
[1770] | 832 | /* Finalize the termios settings. */
|
---|
[821] | 833 |
|
---|
[1770] | 834 | termios_final(&options, &termios, &chardata);
|
---|
[821] | 835 |
|
---|
| 836 | /* Now the newline character should be properly written. */
|
---|
| 837 |
|
---|
[1770] | 838 | write(1, "\n", 1);
|
---|
[821] | 839 |
|
---|
| 840 | /* Let the login program take care of password validation. */
|
---|
| 841 |
|
---|
[1770] | 842 | execl(options.login, options.login, "--", logname, (char *) 0);
|
---|
| 843 | bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login);
|
---|
[821] | 844 | }
|
---|