| 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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| 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 Mickiewicz <misiek@misiek.eu.org>
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| 10 | * - added Native Language Support
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| 11 | *
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| 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 source tree.
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| 16 | */
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| 17 |
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| 18 | #include "libbb.h"
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| 19 | #include <syslog.h>
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| 20 |
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| 21 | #if ENABLE_FEATURE_UTMP
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| 22 | # include <utmp.h> /* LOGIN_PROCESS */
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| 23 | #endif
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| 24 |
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| 25 | #ifndef IUCLC
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| 26 | # define IUCLC 0
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| 27 | #endif
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| 28 |
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| 29 | /*
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| 30 | * Some heuristics to find out what environment we are in: if it is not
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| 31 | * System V, assume it is SunOS 4.
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| 32 | */
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| 33 | #ifdef LOGIN_PROCESS /* defined in System V utmp.h */
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| 34 | #include <sys/utsname.h>
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| 35 | #else /* if !sysV style, wtmp/utmp code is off */
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| 36 | #undef ENABLE_FEATURE_UTMP
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| 37 | #undef ENABLE_FEATURE_WTMP
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| 38 | #define ENABLE_FEATURE_UTMP 0
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| 39 | #define ENABLE_FEATURE_WTMP 0
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| 40 | #endif /* LOGIN_PROCESS */
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| 41 |
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| 42 | /*
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| 43 | * Things you may want to modify.
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| 44 | *
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| 45 | * You may disagree with the default line-editing etc. characters defined
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| 46 | * below. Note, however, that DEL cannot be used for interrupt generation
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| 47 | * and for line editing at the same time.
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| 48 | */
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| 49 |
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| 50 | /* I doubt there are systems which still need this */
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| 51 | #undef HANDLE_ALLCAPS
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| 52 | #undef ANCIENT_BS_KILL_CHARS
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| 53 |
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| 54 | #define _PATH_LOGIN "/bin/login"
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| 55 |
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| 56 | /* If ISSUE is not defined, getty will never display the contents of the
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| 57 | * /etc/issue file. You will not want to spit out large "issue" files at the
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| 58 | * wrong baud rate.
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| 59 | */
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| 60 | #define ISSUE "/etc/issue" /* displayed before the login prompt */
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| 61 |
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| 62 | /* Some shorthands for control characters. */
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| 63 | #define CTL(x) ((x) ^ 0100) /* Assumes ASCII dialect */
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| 64 | #define CR CTL('M') /* carriage return */
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| 65 | #define NL CTL('J') /* line feed */
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| 66 | #define BS CTL('H') /* back space */
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| 67 | #define DEL CTL('?') /* delete */
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| 68 |
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| 69 | /* Defaults for line-editing etc. characters; you may want to change this. */
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| 70 | #define DEF_ERASE DEL /* default erase character */
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| 71 | #define DEF_INTR CTL('C') /* default interrupt character */
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| 72 | #define DEF_QUIT CTL('\\') /* default quit char */
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| 73 | #define DEF_KILL CTL('U') /* default kill char */
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| 74 | #define DEF_EOF CTL('D') /* default EOF char */
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| 75 | #define DEF_EOL '\n'
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| 76 | #define DEF_SWITCH 0 /* default switch char */
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| 77 |
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| 78 | /*
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| 79 | * When multiple baud rates are specified on the command line, the first one
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| 80 | * we will try is the first one specified.
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| 81 | */
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| 82 | #define MAX_SPEED 10 /* max. nr. of baud rates */
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| 83 |
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| 84 | /* Storage for command-line options. */
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| 85 | struct options {
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| 86 | int flags; /* toggle switches, see below */
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| 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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| 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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| 96 | /* Storage for things detected while the login name was read. */
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| 97 | struct chardata {
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| 98 | unsigned char erase; /* erase character */
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| 99 | unsigned char kill; /* kill character */
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| 100 | unsigned char eol; /* end-of-line character */
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| 101 | unsigned char parity; /* what parity did we see */
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| 102 | /* (parity & 1): saw odd parity char with 7th bit set */
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| 103 | /* (parity & 2): saw even parity char with 7th bit set */
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| 104 | /* parity == 0: probably 7-bit, space parity? */
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| 105 | /* parity == 1: probably 7-bit, odd parity? */
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| 106 | /* parity == 2: probably 7-bit, even parity? */
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| 107 | /* parity == 3: definitely 8 bit, no parity! */
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| 108 | /* Hmm... with any value of "parity" 8 bit, no parity is possible */
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| 109 | #ifdef HANDLE_ALLCAPS
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| 110 | unsigned char capslock; /* upper case without lower case */
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| 111 | #endif
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| 112 | };
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| 113 |
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| 114 |
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| 115 | /* Initial values for the above. */
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| 116 | static const struct chardata init_chardata = {
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| 117 | DEF_ERASE, /* default erase character */
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| 118 | DEF_KILL, /* default kill character */
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| 119 | 13, /* default eol char */
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| 120 | 0, /* space parity */
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| 121 | #ifdef HANDLE_ALLCAPS
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| 122 | 0, /* no capslock */
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| 123 | #endif
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| 124 | };
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| 125 |
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| 126 | static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
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| 127 | #define F_INITSTRING (1 << 0) /* -I initstring is set */
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| 128 | #define F_LOCAL (1 << 1) /* -L force local */
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| 129 | #define F_FAKEHOST (1 << 2) /* -H fake hostname */
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| 130 | #define F_CUSTISSUE (1 << 3) /* -f give alternative issue file */
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| 131 | #define F_RTSCTS (1 << 4) /* -h enable RTS/CTS flow control */
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| 132 | #define F_ISSUE (1 << 5) /* -i display /etc/issue */
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| 133 | #define F_LOGIN (1 << 6) /* -l non-default login program */
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| 134 | #define F_PARSE (1 << 7) /* -m process modem status messages */
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| 135 | #define F_TIMEOUT (1 << 8) /* -t time out */
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| 136 | #define F_WAITCRLF (1 << 9) /* -w wait for CR or LF */
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| 137 | #define F_NOPROMPT (1 << 10) /* -n don't ask for login name */
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| 138 |
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| 139 |
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| 140 | #define line_buf bb_common_bufsiz1
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| 141 |
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| 142 | /* The following is used for understandable diagnostics. */
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| 143 | #ifdef DEBUGGING
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| 144 | static FILE *dbf;
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| 145 | #define DEBUGTERM "/dev/ttyp0"
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| 146 | #define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0)
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| 147 | #else
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| 148 | #define debug(...) ((void)0)
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| 149 | #endif
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| 150 |
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| 151 |
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| 152 | /* bcode - convert speed string to speed code; return <= 0 on failure */
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| 153 | static int bcode(const char *s)
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| 154 | {
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| 155 | int value = bb_strtou(s, NULL, 10); /* yes, int is intended! */
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| 156 | if (value < 0) /* bad terminating char, overflow, etc */
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| 157 | return value;
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| 158 | return tty_value_to_baud(value);
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| 159 | }
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| 160 |
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| 161 | /* parse_speeds - parse alternate baud rates */
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| 162 | static void parse_speeds(struct options *op, char *arg)
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| 163 | {
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| 164 | char *cp;
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| 165 |
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| 166 | /* NB: at least one iteration is always done */
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| 167 | debug("entered parse_speeds\n");
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| 168 | while ((cp = strsep(&arg, ",")) != NULL) {
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| 169 | op->speeds[op->numspeed] = bcode(cp);
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| 170 | if (op->speeds[op->numspeed] < 0)
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| 171 | bb_error_msg_and_die("bad speed: %s", cp);
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| 172 | /* note: arg "0" turns into speed B0 */
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| 173 | op->numspeed++;
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| 174 | if (op->numspeed > MAX_SPEED)
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| 175 | bb_error_msg_and_die("too many alternate speeds");
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| 176 | }
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| 177 | debug("exiting parse_speeds\n");
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| 178 | }
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| 179 |
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| 180 | /* parse_args - parse command-line arguments */
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| 181 | static void parse_args(char **argv, struct options *op, char **fakehost_p)
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| 182 | {
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| 183 | char *ts;
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| 184 |
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| 185 | opt_complementary = "-2:t+"; /* at least 2 args; -t N */
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| 186 | op->flags = getopt32(argv, opt_string,
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| 187 | &(op->initstring), fakehost_p, &(op->issue),
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| 188 | &(op->login), &op->timeout);
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| 189 | argv += optind;
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| 190 | if (op->flags & F_INITSTRING) {
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| 191 | op->initstring = xstrdup(op->initstring);
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| 192 | /* decode \ddd octal codes into chars */
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| 193 | strcpy_and_process_escape_sequences((char*)op->initstring, op->initstring);
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| 194 | }
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| 195 | op->flags ^= F_ISSUE; /* invert flag "show /etc/issue" */
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| 196 | debug("after getopt\n");
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| 197 |
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| 198 | /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
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| 199 | op->tty = argv[0]; /* tty name */
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| 200 | ts = argv[1]; /* baud rate(s) */
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| 201 | if (isdigit(argv[0][0])) {
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| 202 | /* a number first, assume it's a speed (BSD style) */
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| 203 | op->tty = ts; /* tty name is in argv[1] */
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| 204 | ts = argv[0]; /* baud rate(s) */
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| 205 | }
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| 206 | parse_speeds(op, ts);
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| 207 | applet_name = xasprintf("getty: %s", op->tty);
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| 208 |
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| 209 | if (argv[2])
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| 210 | xsetenv("TERM", argv[2]);
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| 211 |
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| 212 | debug("exiting parse_args\n");
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| 213 | }
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| 214 |
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| 215 | /* open_tty - set up tty as standard { input, output, error } */
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| 216 | static void open_tty(const char *tty)
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| 217 | {
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| 218 | /* Set up new standard input, unless we are given an already opened port. */
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| 219 | if (NOT_LONE_DASH(tty)) {
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| 220 | // struct stat st;
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| 221 | // int cur_dir_fd;
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| 222 | // int fd;
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| 223 |
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| 224 | /* Sanity checks... */
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| 225 | // cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
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| 226 | // xchdir("/dev");
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| 227 | // xstat(tty, &st);
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| 228 | // if (!S_ISCHR(st.st_mode))
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| 229 | // bb_error_msg_and_die("not a character device");
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| 230 |
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| 231 | if (tty[0] != '/')
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| 232 | tty = xasprintf("/dev/%s", tty); /* will leak it */
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| 233 |
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| 234 | /* Open the tty as standard input. */
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| 235 | debug("open(2)\n");
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| 236 | close(0);
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| 237 | /*fd =*/ xopen(tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */
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| 238 |
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| 239 | // /* Restore current directory */
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| 240 | // fchdir(cur_dir_fd);
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| 241 |
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| 242 | /* Open the tty as standard input, continued */
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| 243 | // xmove_fd(fd, 0);
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| 244 | // /* fd is >= cur_dir_fd, and cur_dir_fd gets closed too here: */
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| 245 | // while (fd > 2)
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| 246 | // close(fd--);
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| 247 |
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| 248 | /* Set proper protections and ownership. */
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| 249 | fchown(0, 0, 0); /* 0:0 */
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| 250 | fchmod(0, 0620); /* crw--w---- */
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| 251 | } else {
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| 252 | /*
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| 253 | * Standard input should already be connected to an open port. Make
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| 254 | * sure it is open for read/write.
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| 255 | */
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| 256 | if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
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| 257 | bb_error_msg_and_die("stdin is not open for read/write");
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| 258 | }
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| 259 | }
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| 260 |
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| 261 | /* termios_init - initialize termios settings */
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| 262 | static void termios_init(struct termios *tp, int speed, struct options *op)
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| 263 | {
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| 264 | speed_t ispeed, ospeed;
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| 265 | /*
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| 266 | * Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
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| 267 | * Special characters are set after we have read the login name; all
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| 268 | * reads will be done in raw mode anyway. Errors will be dealt with
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| 269 | * later on.
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| 270 | */
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| 271 | /* flush input and output queues, important for modems! */
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| 272 | tcflush(0, TCIOFLUSH);
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| 273 | ispeed = ospeed = speed;
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| 274 | if (speed == B0) {
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| 275 | /* Speed was specified as "0" on command line.
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| 276 | * Just leave it unchanged */
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| 277 | ispeed = cfgetispeed(tp);
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| 278 | ospeed = cfgetospeed(tp);
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| 279 | }
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| 280 | tp->c_cflag = CS8 | HUPCL | CREAD;
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| 281 | if (op->flags & F_LOCAL)
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| 282 | tp->c_cflag |= CLOCAL;
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| 283 | cfsetispeed(tp, ispeed);
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| 284 | cfsetospeed(tp, ospeed);
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| 285 |
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| 286 | tp->c_iflag = tp->c_lflag = 0;
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| 287 | tp->c_oflag = OPOST | ONLCR;
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| 288 | tp->c_cc[VMIN] = 1;
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| 289 | tp->c_cc[VTIME] = 0;
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| 290 | #ifdef __linux__
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| 291 | tp->c_line = 0;
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| 292 | #endif
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| 293 |
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| 294 | /* Optionally enable hardware flow control */
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| 295 | #ifdef CRTSCTS
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| 296 | if (op->flags & F_RTSCTS)
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| 297 | tp->c_cflag |= CRTSCTS;
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| 298 | #endif
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| 299 |
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| 300 | tcsetattr_stdin_TCSANOW(tp);
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| 301 |
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| 302 | debug("term_io 2\n");
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| 303 | }
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| 304 |
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| 305 | /* auto_baud - extract baud rate from modem status message */
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| 306 | static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
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| 307 | {
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| 308 | int speed;
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| 309 | int vmin;
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| 310 | unsigned iflag;
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| 311 | char *bp;
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| 312 | int nread;
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| 313 |
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| 314 | /*
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| 315 | * This works only if the modem produces its status code AFTER raising
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| 316 | * the DCD line, and if the computer is fast enough to set the proper
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| 317 | * baud rate before the message has gone by. We expect a message of the
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| 318 | * following format:
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| 319 | *
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| 320 | * <junk><number><junk>
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| 321 | *
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| 322 | * The number is interpreted as the baud rate of the incoming call. If the
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| 323 | * modem does not tell us the baud rate within one second, we will keep
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| 324 | * using the current baud rate. It is advisable to enable BREAK
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| 325 | * processing (comma-separated list of baud rates) if the processing of
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| 326 | * modem status messages is enabled.
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| 327 | */
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| 328 |
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| 329 | /*
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| 330 | * Use 7-bit characters, don't block if input queue is empty. Errors will
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| 331 | * be dealt with later on.
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| 332 | */
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| 333 | iflag = tp->c_iflag;
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| 334 | tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
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| 335 | vmin = tp->c_cc[VMIN];
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| 336 | tp->c_cc[VMIN] = 0; /* don't block if queue empty */
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| 337 | tcsetattr_stdin_TCSANOW(tp);
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| 338 |
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| 339 | /*
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| 340 | * Wait for a while, then read everything the modem has said so far and
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| 341 | * try to extract the speed of the dial-in call.
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| 342 | */
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| 343 | sleep(1);
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| 344 | nread = safe_read(STDIN_FILENO, buf, size_buf - 1);
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| 345 | if (nread > 0) {
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| 346 | buf[nread] = '\0';
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| 347 | for (bp = buf; bp < buf + nread; bp++) {
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| 348 | if (isdigit(*bp)) {
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| 349 | speed = bcode(bp);
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| 350 | if (speed > 0)
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| 351 | cfsetspeed(tp, speed);
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| 352 | break;
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| 353 | }
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| 354 | }
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| 355 | }
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| 356 |
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| 357 | /* Restore terminal settings. Errors will be dealt with later on. */
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| 358 | tp->c_iflag = iflag;
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| 359 | tp->c_cc[VMIN] = vmin;
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| 360 | tcsetattr_stdin_TCSANOW(tp);
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| 361 | }
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| 362 |
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| 363 | /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
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| 364 | static void do_prompt(struct options *op)
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| 365 | {
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| 366 | #ifdef ISSUE
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| 367 | print_login_issue(op->issue, op->tty);
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| 368 | #endif
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| 369 | print_login_prompt();
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| 370 | }
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| 371 |
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| 372 | #ifdef HANDLE_ALLCAPS
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| 373 | /* all_is_upcase - string contains upper case without lower case */
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| 374 | /* returns 1 if true, 0 if false */
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| 375 | static int all_is_upcase(const char *s)
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| 376 | {
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| 377 | while (*s)
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| 378 | if (islower(*s++))
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| 379 | return 0;
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| 380 | return 1;
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| 381 | }
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| 382 | #endif
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| 383 |
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| 384 | /* get_logname - get user name, establish parity, speed, erase, kill, eol;
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| 385 | * return NULL on BREAK, logname on success */
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| 386 | static char *get_logname(char *logname, unsigned size_logname,
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|---|
| 387 | struct options *op, struct chardata *cp)
|
|---|
| 388 | {
|
|---|
| 389 | char *bp;
|
|---|
| 390 | char c; /* input character, full eight bits */
|
|---|
| 391 | char ascval; /* low 7 bits of input character */
|
|---|
| 392 | int bits; /* # of "1" bits per character */
|
|---|
| 393 | int mask; /* mask with 1 bit up */
|
|---|
| 394 | static const char erase[][3] = {/* backspace-space-backspace */
|
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| 395 | "\010\040\010", /* space parity */
|
|---|
| 396 | "\010\040\010", /* odd parity */
|
|---|
| 397 | "\210\240\210", /* even parity */
|
|---|
| 398 | "\010\040\010", /* 8 bit no parity */
|
|---|
| 399 | };
|
|---|
| 400 |
|
|---|
| 401 | /* NB: *cp is pre-initialized with init_chardata */
|
|---|
| 402 |
|
|---|
| 403 | /* Flush pending input (esp. after parsing or switching the baud rate). */
|
|---|
| 404 | sleep(1);
|
|---|
| 405 | tcflush(0, TCIOFLUSH);
|
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| 406 |
|
|---|
| 407 | /* Prompt for and read a login name. */
|
|---|
| 408 | logname[0] = '\0';
|
|---|
| 409 | while (!logname[0]) {
|
|---|
| 410 | /* Write issue file and prompt, with "parity" bit == 0. */
|
|---|
| 411 | do_prompt(op);
|
|---|
| 412 |
|
|---|
| 413 | /* Read name, watch for break, parity, erase, kill, end-of-line. */
|
|---|
| 414 | bp = logname;
|
|---|
| 415 | cp->eol = '\0';
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|---|
| 416 | while (cp->eol == '\0') {
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| 417 |
|
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| 418 | /* Do not report trivial EINTR/EIO errors. */
|
|---|
| 419 | errno = EINTR; /* make read of 0 bytes be silent too */
|
|---|
| 420 | if (read(STDIN_FILENO, &c, 1) < 1) {
|
|---|
| 421 | if (errno == EINTR || errno == EIO)
|
|---|
| 422 | exit(EXIT_SUCCESS);
|
|---|
| 423 | bb_perror_msg_and_die(bb_msg_read_error);
|
|---|
| 424 | }
|
|---|
| 425 |
|
|---|
| 426 | /* BREAK. If we have speeds to try,
|
|---|
| 427 | * return NULL (will switch speeds and return here) */
|
|---|
| 428 | if (c == '\0' && op->numspeed > 1)
|
|---|
| 429 | return NULL;
|
|---|
| 430 |
|
|---|
| 431 | /* Do parity bit handling. */
|
|---|
| 432 | if (!(op->flags & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */
|
|---|
| 433 | bits = 1;
|
|---|
| 434 | mask = 1;
|
|---|
| 435 | while (mask & 0x7f) {
|
|---|
| 436 | if (mask & c)
|
|---|
| 437 | bits++; /* count "1" bits */
|
|---|
| 438 | mask <<= 1;
|
|---|
| 439 | }
|
|---|
| 440 | /* ... |= 2 - even, 1 - odd */
|
|---|
| 441 | cp->parity |= 2 - (bits & 1);
|
|---|
| 442 | }
|
|---|
| 443 |
|
|---|
| 444 | /* Do erase, kill and end-of-line processing. */
|
|---|
| 445 | ascval = c & 0x7f;
|
|---|
| 446 | switch (ascval) {
|
|---|
| 447 | case CR:
|
|---|
| 448 | case NL:
|
|---|
| 449 | *bp = '\0'; /* terminate logname */
|
|---|
| 450 | cp->eol = ascval; /* set end-of-line char */
|
|---|
| 451 | break;
|
|---|
| 452 | case BS:
|
|---|
| 453 | case DEL:
|
|---|
| 454 | #ifdef ANCIENT_BS_KILL_CHARS
|
|---|
| 455 | case '#':
|
|---|
| 456 | #endif
|
|---|
| 457 | cp->erase = ascval; /* set erase character */
|
|---|
| 458 | if (bp > logname) {
|
|---|
| 459 | full_write(STDOUT_FILENO, erase[cp->parity], 3);
|
|---|
| 460 | bp--;
|
|---|
| 461 | }
|
|---|
| 462 | break;
|
|---|
| 463 | case CTL('U'):
|
|---|
| 464 | #ifdef ANCIENT_BS_KILL_CHARS
|
|---|
| 465 | case '@':
|
|---|
| 466 | #endif
|
|---|
| 467 | cp->kill = ascval; /* set kill character */
|
|---|
| 468 | while (bp > logname) {
|
|---|
| 469 | full_write(STDOUT_FILENO, erase[cp->parity], 3);
|
|---|
| 470 | bp--;
|
|---|
| 471 | }
|
|---|
| 472 | break;
|
|---|
| 473 | case CTL('D'):
|
|---|
| 474 | exit(EXIT_SUCCESS);
|
|---|
| 475 | default:
|
|---|
| 476 | if (ascval < ' ') {
|
|---|
| 477 | /* ignore garbage characters */
|
|---|
| 478 | } else if ((int)(bp - logname) >= size_logname - 1) {
|
|---|
| 479 | bb_error_msg_and_die("input overrun");
|
|---|
| 480 | } else {
|
|---|
| 481 | full_write(STDOUT_FILENO, &c, 1); /* echo the character */
|
|---|
| 482 | *bp++ = ascval; /* and store it */
|
|---|
| 483 | }
|
|---|
| 484 | break;
|
|---|
| 485 | }
|
|---|
| 486 | }
|
|---|
| 487 | }
|
|---|
| 488 | /* Handle names with upper case and no lower case. */
|
|---|
| 489 |
|
|---|
| 490 | #ifdef HANDLE_ALLCAPS
|
|---|
| 491 | cp->capslock = all_is_upcase(logname);
|
|---|
| 492 | if (cp->capslock) {
|
|---|
| 493 | for (bp = logname; *bp; bp++)
|
|---|
| 494 | if (isupper(*bp))
|
|---|
| 495 | *bp = tolower(*bp); /* map name to lower case */
|
|---|
| 496 | }
|
|---|
| 497 | #endif
|
|---|
| 498 | return logname;
|
|---|
| 499 | }
|
|---|
| 500 |
|
|---|
| 501 | /* termios_final - set the final tty mode bits */
|
|---|
| 502 | static void termios_final(struct options *op, struct termios *tp, struct chardata *cp)
|
|---|
| 503 | {
|
|---|
| 504 | /* General terminal-independent stuff. */
|
|---|
| 505 | tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
|
|---|
| 506 | tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
|
|---|
| 507 | /* no longer| ECHOCTL | ECHOPRT */
|
|---|
| 508 | tp->c_oflag |= OPOST;
|
|---|
| 509 | /* tp->c_cflag = 0; */
|
|---|
| 510 | tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
|
|---|
| 511 | tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
|
|---|
| 512 | tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
|
|---|
| 513 | tp->c_cc[VEOL] = DEF_EOL;
|
|---|
| 514 | #ifdef VSWTC
|
|---|
| 515 | tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
|
|---|
| 516 | #endif
|
|---|
| 517 |
|
|---|
| 518 | /* Account for special characters seen in input. */
|
|---|
| 519 | if (cp->eol == CR) {
|
|---|
| 520 | tp->c_iflag |= ICRNL; /* map CR in input to NL */
|
|---|
| 521 | tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
|
|---|
| 522 | }
|
|---|
| 523 | tp->c_cc[VERASE] = cp->erase; /* set erase character */
|
|---|
| 524 | tp->c_cc[VKILL] = cp->kill; /* set kill character */
|
|---|
| 525 |
|
|---|
| 526 | /* Account for the presence or absence of parity bits in input. */
|
|---|
| 527 | switch (cp->parity) {
|
|---|
| 528 | case 0: /* space (always 0) parity */
|
|---|
| 529 | // I bet most people go here - they use only 7-bit chars in usernames....
|
|---|
| 530 | break;
|
|---|
| 531 | case 1: /* odd parity */
|
|---|
| 532 | tp->c_cflag |= PARODD;
|
|---|
| 533 | /* FALLTHROUGH */
|
|---|
| 534 | case 2: /* even parity */
|
|---|
| 535 | tp->c_cflag |= PARENB;
|
|---|
| 536 | tp->c_iflag |= INPCK | ISTRIP;
|
|---|
| 537 | /* FALLTHROUGH */
|
|---|
| 538 | case (1 | 2): /* no parity bit */
|
|---|
| 539 | tp->c_cflag &= ~CSIZE;
|
|---|
| 540 | tp->c_cflag |= CS7;
|
|---|
| 541 | // FIXME: wtf? case 3: we saw both even and odd 8-bit bytes -
|
|---|
| 542 | // it's probably some umlauts etc, but definitely NOT 7-bit!!!
|
|---|
| 543 | // Entire parity detection madness here just begs for deletion...
|
|---|
| 544 | break;
|
|---|
| 545 | }
|
|---|
| 546 |
|
|---|
| 547 | /* Account for upper case without lower case. */
|
|---|
| 548 | #ifdef HANDLE_ALLCAPS
|
|---|
| 549 | if (cp->capslock) {
|
|---|
| 550 | tp->c_iflag |= IUCLC;
|
|---|
| 551 | tp->c_lflag |= XCASE;
|
|---|
| 552 | tp->c_oflag |= OLCUC;
|
|---|
| 553 | }
|
|---|
| 554 | #endif
|
|---|
| 555 | /* Optionally enable hardware flow control */
|
|---|
| 556 | #ifdef CRTSCTS
|
|---|
| 557 | if (op->flags & F_RTSCTS)
|
|---|
| 558 | tp->c_cflag |= CRTSCTS;
|
|---|
| 559 | #endif
|
|---|
| 560 |
|
|---|
| 561 | /* Finally, make the new settings effective */
|
|---|
| 562 | if (tcsetattr_stdin_TCSANOW(tp) < 0)
|
|---|
| 563 | bb_perror_msg_and_die("tcsetattr");
|
|---|
| 564 | }
|
|---|
| 565 |
|
|---|
| 566 | int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 567 | int getty_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 568 | {
|
|---|
| 569 | int n;
|
|---|
| 570 | pid_t pid;
|
|---|
| 571 | char *fakehost = NULL; /* Fake hostname for ut_host */
|
|---|
| 572 | char *logname; /* login name, given to /bin/login */
|
|---|
| 573 | /* Merging these into "struct local" may _seem_ to reduce
|
|---|
| 574 | * parameter passing, but today's gcc will inline
|
|---|
| 575 | * statics which are called once anyway, so don't do that */
|
|---|
| 576 | struct chardata chardata; /* set by get_logname() */
|
|---|
| 577 | struct termios termios; /* terminal mode bits */
|
|---|
| 578 | struct options options;
|
|---|
| 579 |
|
|---|
| 580 | chardata = init_chardata;
|
|---|
| 581 |
|
|---|
| 582 | memset(&options, 0, sizeof(options));
|
|---|
| 583 | options.login = _PATH_LOGIN; /* default login program */
|
|---|
| 584 | options.tty = "tty1"; /* default tty line */
|
|---|
| 585 | options.initstring = ""; /* modem init string */
|
|---|
| 586 | #ifdef ISSUE
|
|---|
| 587 | options.issue = ISSUE; /* default issue file */
|
|---|
| 588 | #endif
|
|---|
| 589 |
|
|---|
| 590 | /* Parse command-line arguments. */
|
|---|
| 591 | parse_args(argv, &options, &fakehost);
|
|---|
| 592 |
|
|---|
| 593 | logmode = LOGMODE_NONE;
|
|---|
| 594 |
|
|---|
| 595 | /* Create new session, lose controlling tty, if any */
|
|---|
| 596 | /* docs/ctty.htm says:
|
|---|
| 597 | * "This is allowed only when the current process
|
|---|
| 598 | * is not a process group leader" - is this a problem? */
|
|---|
| 599 | setsid();
|
|---|
| 600 | /* close stdio, and stray descriptors, just in case */
|
|---|
| 601 | n = xopen(bb_dev_null, O_RDWR);
|
|---|
| 602 | /* dup2(n, 0); - no, we need to handle "getty - 9600" too */
|
|---|
| 603 | xdup2(n, 1);
|
|---|
| 604 | xdup2(n, 2);
|
|---|
| 605 | while (n > 2)
|
|---|
| 606 | close(n--);
|
|---|
| 607 |
|
|---|
| 608 | /* Logging. We want special flavor of error_msg_and_die */
|
|---|
| 609 | die_sleep = 10;
|
|---|
| 610 | msg_eol = "\r\n";
|
|---|
| 611 | /* most likely will internally use fd #3 in CLOEXEC mode: */
|
|---|
| 612 | openlog(applet_name, LOG_PID, LOG_AUTH);
|
|---|
| 613 | logmode = LOGMODE_BOTH;
|
|---|
| 614 |
|
|---|
| 615 | #ifdef DEBUGGING
|
|---|
| 616 | dbf = xfopen_for_write(DEBUGTERM);
|
|---|
| 617 | for (n = 1; argv[n]; n++) {
|
|---|
| 618 | debug(argv[n]);
|
|---|
| 619 | debug("\n");
|
|---|
| 620 | }
|
|---|
| 621 | #endif
|
|---|
| 622 |
|
|---|
| 623 | /* Open the tty as standard input, if it is not "-" */
|
|---|
| 624 | /* If it's not "-" and not taken yet, it will become our ctty */
|
|---|
| 625 | debug("calling open_tty\n");
|
|---|
| 626 | open_tty(options.tty);
|
|---|
| 627 | ndelay_off(0);
|
|---|
| 628 | debug("duping\n");
|
|---|
| 629 | xdup2(0, 1);
|
|---|
| 630 | xdup2(0, 2);
|
|---|
| 631 |
|
|---|
| 632 | /*
|
|---|
| 633 | * The following ioctl will fail if stdin is not a tty, but also when
|
|---|
| 634 | * there is noise on the modem control lines. In the latter case, the
|
|---|
| 635 | * common course of action is (1) fix your cables (2) give the modem more
|
|---|
| 636 | * time to properly reset after hanging up. SunOS users can achieve (2)
|
|---|
| 637 | * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
|
|---|
| 638 | * 5 seconds seems to be a good value.
|
|---|
| 639 | */
|
|---|
| 640 | if (tcgetattr(0, &termios) < 0)
|
|---|
| 641 | bb_perror_msg_and_die("tcgetattr");
|
|---|
| 642 |
|
|---|
| 643 | pid = getpid();
|
|---|
| 644 | #ifdef __linux__
|
|---|
| 645 | // FIXME: do we need this? Otherwise "-" case seems to be broken...
|
|---|
| 646 | // /* Forcibly make fd 0 our controlling tty, even if another session
|
|---|
| 647 | // * has it as a ctty. (Another session loses ctty). */
|
|---|
| 648 | // ioctl(0, TIOCSCTTY, (void*)1);
|
|---|
| 649 | /* Make ourself a foreground process group within our session */
|
|---|
| 650 | tcsetpgrp(0, pid);
|
|---|
| 651 | #endif
|
|---|
| 652 |
|
|---|
| 653 | /* Update the utmp file. This tty is ours now! */
|
|---|
| 654 | update_utmp(pid, LOGIN_PROCESS, options.tty, "LOGIN", fakehost);
|
|---|
| 655 |
|
|---|
| 656 | /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
|
|---|
| 657 | debug("calling termios_init\n");
|
|---|
| 658 | termios_init(&termios, options.speeds[0], &options);
|
|---|
| 659 |
|
|---|
| 660 | /* Write the modem init string and DON'T flush the buffers */
|
|---|
| 661 | if (options.flags & F_INITSTRING) {
|
|---|
| 662 | debug("writing init string\n");
|
|---|
| 663 | full_write1_str(options.initstring);
|
|---|
| 664 | }
|
|---|
| 665 |
|
|---|
| 666 | /* Optionally detect the baud rate from the modem status message */
|
|---|
| 667 | debug("before autobaud\n");
|
|---|
| 668 | if (options.flags & F_PARSE)
|
|---|
| 669 | auto_baud(line_buf, sizeof(line_buf), &termios);
|
|---|
| 670 |
|
|---|
| 671 | /* Set the optional timer */
|
|---|
| 672 | alarm(options.timeout); /* if 0, alarm is not set */
|
|---|
| 673 |
|
|---|
| 674 | /* Optionally wait for CR or LF before writing /etc/issue */
|
|---|
| 675 | if (options.flags & F_WAITCRLF) {
|
|---|
| 676 | char ch;
|
|---|
| 677 |
|
|---|
| 678 | debug("waiting for cr-lf\n");
|
|---|
| 679 | while (safe_read(STDIN_FILENO, &ch, 1) == 1) {
|
|---|
| 680 | debug("read %x\n", (unsigned char)ch);
|
|---|
| 681 | ch &= 0x7f; /* strip "parity bit" */
|
|---|
| 682 | if (ch == '\n' || ch == '\r')
|
|---|
| 683 | break;
|
|---|
| 684 | }
|
|---|
| 685 | }
|
|---|
| 686 |
|
|---|
| 687 | logname = NULL;
|
|---|
| 688 | if (!(options.flags & F_NOPROMPT)) {
|
|---|
| 689 | /* NB:termios_init already set line speed
|
|---|
| 690 | * to options.speeds[0] */
|
|---|
| 691 | int baud_index = 0;
|
|---|
| 692 |
|
|---|
| 693 | while (1) {
|
|---|
| 694 | /* Read the login name. */
|
|---|
| 695 | debug("reading login name\n");
|
|---|
| 696 | logname = get_logname(line_buf, sizeof(line_buf),
|
|---|
| 697 | &options, &chardata);
|
|---|
| 698 | if (logname)
|
|---|
| 699 | break;
|
|---|
| 700 | /* we are here only if options.numspeed > 1 */
|
|---|
| 701 | baud_index = (baud_index + 1) % options.numspeed;
|
|---|
| 702 | cfsetispeed(&termios, options.speeds[baud_index]);
|
|---|
| 703 | cfsetospeed(&termios, options.speeds[baud_index]);
|
|---|
| 704 | tcsetattr_stdin_TCSANOW(&termios);
|
|---|
| 705 | }
|
|---|
| 706 | }
|
|---|
| 707 |
|
|---|
| 708 | /* Disable timer. */
|
|---|
| 709 | alarm(0);
|
|---|
| 710 |
|
|---|
| 711 | /* Finalize the termios settings. */
|
|---|
| 712 | termios_final(&options, &termios, &chardata);
|
|---|
| 713 |
|
|---|
| 714 | /* Now the newline character should be properly written. */
|
|---|
| 715 | full_write(STDOUT_FILENO, "\n", 1);
|
|---|
| 716 |
|
|---|
| 717 | /* Let the login program take care of password validation. */
|
|---|
| 718 | /* We use PATH because we trust that root doesn't set "bad" PATH,
|
|---|
| 719 | * and getty is not suid-root applet. */
|
|---|
| 720 | /* With -n, logname == NULL, and login will ask for username instead */
|
|---|
| 721 | BB_EXECLP(options.login, options.login, "--", logname, NULL);
|
|---|
| 722 | bb_error_msg_and_die("can't execute '%s'", options.login);
|
|---|
| 723 | }
|
|---|
