[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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| 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 | -f 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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| 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 | */
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| 16 |
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| 17 | #include <stdio.h>
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| 18 | #include <stdlib.h>
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| 19 | #include <unistd.h>
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| 20 | #include <string.h>
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| 21 | #include <sys/ioctl.h>
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| 22 | #include <errno.h>
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| 23 | #include <sys/stat.h>
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| 24 | #include <signal.h>
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| 25 | #include <fcntl.h>
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| 26 | #include <stdarg.h>
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| 27 | #include <ctype.h>
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| 28 | #include <getopt.h>
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| 29 | #include <termios.h>
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| 30 | #include "busybox.h"
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| 31 |
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| 32 | #ifdef CONFIG_FEATURE_UTMP
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| 33 | #include <utmp.h>
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| 34 | #endif
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| 35 |
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| 36 | #define _PATH_LOGIN "/bin/login"
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| 37 |
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| 38 | /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
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| 39 | #ifdef CONFIG_SYSLOGD
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| 40 | #include <sys/param.h>
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| 41 | #include <syslog.h>
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| 42 | #endif
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| 43 |
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| 44 |
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| 45 | /*
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| 46 | * Some heuristics to find out what environment we are in: if it is not
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| 47 | * System V, assume it is SunOS 4.
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| 48 | */
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| 49 |
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| 50 | #ifdef LOGIN_PROCESS /* defined in System V utmp.h */
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| 51 | #define SYSV_STYLE /* select System V style getty */
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| 52 | #ifdef CONFIG_FEATURE_WTMP
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| 53 | extern void updwtmp(const char *filename, const struct utmp *ut);
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| 54 | #endif
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| 55 | #endif /* LOGIN_PROCESS */
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| 56 |
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| 57 | /*
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| 58 | * Things you may want to modify.
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| 59 | *
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| 60 | * You may disagree with the default line-editing etc. characters defined
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| 61 | * below. Note, however, that DEL cannot be used for interrupt generation
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| 62 | * and for line editing at the same time.
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| 63 | */
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| 64 |
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| 65 | #ifdef SYSV_STYLE
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| 66 | #include <sys/utsname.h>
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| 67 | #include <time.h>
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| 68 | #endif
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| 69 |
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| 70 | /* If ISSUE is not defined, agetty will never display the contents of the
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| 71 | * /etc/issue file. You will not want to spit out large "issue" files at the
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| 72 | * wrong baud rate.
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| 73 | */
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| 74 | #define ISSUE "/etc/issue" /* displayed before the login prompt */
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| 75 |
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| 76 | /* Some shorthands for control characters. */
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| 77 |
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| 78 | #define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
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| 79 | #define CR CTL('M') /* carriage return */
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| 80 | #define NL CTL('J') /* line feed */
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| 81 | #define BS CTL('H') /* back space */
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| 82 | #define DEL CTL('?') /* delete */
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| 83 |
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| 84 | /* Defaults for line-editing etc. characters; you may want to change this. */
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| 85 |
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| 86 | #define DEF_ERASE DEL /* default erase character */
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| 87 | #define DEF_INTR CTL('C') /* default interrupt character */
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| 88 | #define DEF_QUIT CTL('\\') /* default quit char */
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| 89 | #define DEF_KILL CTL('U') /* default kill char */
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| 90 | #define DEF_EOF CTL('D') /* default EOF char */
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| 91 | #define DEF_EOL '\n'
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| 92 | #define DEF_SWITCH 0 /* default switch char */
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| 93 |
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| 94 | /*
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| 95 | * SunOS 4.1.1 termio is broken. We must use the termios stuff instead,
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| 96 | * because the termio -> termios translation does not clear the termios
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| 97 | * CIBAUD bits. Therefore, the tty driver would sometimes report that input
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| 98 | * baud rate != output baud rate. I did not notice that problem with SunOS
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| 99 | * 4.1. We will use termios where available, and termio otherwise.
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| 100 | */
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| 101 |
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| 102 | /* linux 0.12 termio is broken too, if we use it c_cc[VERASE] isn't set
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| 103 | properly, but all is well if we use termios?! */
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| 104 |
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| 105 | #ifdef TCGETS
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| 106 | #undef TCGETA
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| 107 | #undef TCSETA
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| 108 | #undef TCSETAW
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| 109 | #define termio termios
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| 110 | #define TCGETA TCGETS
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| 111 | #define TCSETA TCSETS
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| 112 | #define TCSETAW TCSETSW
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| 113 | #endif
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| 114 |
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| 115 | /*
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| 116 | * When multiple baud rates are specified on the command line, the first one
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| 117 | * we will try is the first one specified.
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| 118 | */
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| 119 |
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| 120 | #define FIRST_SPEED 0
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| 121 |
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| 122 | /* Storage for command-line options. */
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| 123 |
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| 124 | #define MAX_SPEED 10 /* max. nr. of baud rates */
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| 125 |
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| 126 | struct options {
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| 127 | int flags; /* toggle switches, see below */
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| 128 | int timeout; /* time-out period */
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| 129 | char *login; /* login program */
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| 130 | char *tty; /* name of tty */
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| 131 | char *initstring; /* modem init string */
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| 132 | char *issue; /* alternative issue file */
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| 133 | int numspeed; /* number of baud rates to try */
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| 134 | int speeds[MAX_SPEED]; /* baud rates to be tried */
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| 135 | };
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| 136 |
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| 137 | static const char opt_string[] = "I:LH:f:hil:mt:wn";
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| 138 | #define F_INITSTRING (1<<0) /* initstring is set */
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| 139 | #define F_LOCAL (1<<1) /* force local */
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| 140 | #define F_FAKEHOST (1<<2) /* force fakehost */
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| 141 | #define F_CUSTISSUE (1<<3) /* give alternative issue file */
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| 142 | #define F_RTSCTS (1<<4) /* enable RTS/CTS flow control */
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| 143 | #define F_ISSUE (1<<5) /* display /etc/issue */
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| 144 | #define F_LOGIN (1<<6) /* non-default login program */
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| 145 | #define F_PARSE (1<<7) /* process modem status messages */
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| 146 | #define F_TIMEOUT (1<<8) /* time out */
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| 147 | #define F_WAITCRLF (1<<9) /* wait for CR or LF */
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| 148 | #define F_NOPROMPT (1<<10) /* don't ask for login name! */
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| 149 |
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| 150 | /* Storage for things detected while the login name was read. */
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| 151 |
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| 152 | struct chardata {
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| 153 | int erase; /* erase character */
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| 154 | int kill; /* kill character */
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| 155 | int eol; /* end-of-line character */
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| 156 | int parity; /* what parity did we see */
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| 157 | int capslock; /* upper case without lower case */
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| 158 | };
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| 159 |
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| 160 | /* Initial values for the above. */
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| 161 |
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| 162 | static struct chardata init_chardata = {
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| 163 | DEF_ERASE, /* default erase character */
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| 164 | DEF_KILL, /* default kill character */
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| 165 | 13, /* default eol char */
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| 166 | 0, /* space parity */
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| 167 | 0, /* no capslock */
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| 168 | };
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| 169 |
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| 170 | #if 0
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| 171 | struct Speedtab {
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| 172 | long speed;
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| 173 | int code;
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| 174 | };
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| 175 |
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| 176 | static struct Speedtab speedtab[] = {
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| 177 | {50, B50},
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| 178 | {75, B75},
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| 179 | {110, B110},
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| 180 | {134, B134},
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| 181 | {150, B150},
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| 182 | {200, B200},
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| 183 | {300, B300},
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| 184 | {600, B600},
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| 185 | {1200, B1200},
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| 186 | {1800, B1800},
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| 187 | {2400, B2400},
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| 188 | {4800, B4800},
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| 189 | {9600, B9600},
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| 190 | #ifdef B19200
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| 191 | {19200, B19200},
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| 192 | #endif
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| 193 | #ifdef B38400
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| 194 | {38400, B38400},
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| 195 | #endif
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| 196 | #ifdef EXTA
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| 197 | {19200, EXTA},
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| 198 | #endif
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| 199 | #ifdef EXTB
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| 200 | {38400, EXTB},
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| 201 | #endif
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| 202 | #ifdef B57600
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| 203 | {57600, B57600},
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| 204 | #endif
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| 205 | #ifdef B115200
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| 206 | {115200, B115200},
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| 207 | #endif
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| 208 | #ifdef B230400
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| 209 | {230400, B230400},
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| 210 | #endif
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| 211 | {0, 0},
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| 212 | };
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| 213 | #endif
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| 214 |
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| 215 |
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| 216 | #ifdef SYSV_STYLE
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| 217 | #ifdef CONFIG_FEATURE_UTMP
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| 218 | static void update_utmp(char *line);
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| 219 | #endif
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| 220 | #endif
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| 221 |
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| 222 | /* The following is used for understandable diagnostics. */
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| 223 |
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| 224 | /* Fake hostname for ut_host specified on command line. */
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| 225 | static char *fakehost = NULL;
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| 226 |
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| 227 | /* ... */
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| 228 | #ifdef DEBUGGING
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| 229 | #define debug(s) fprintf(dbf,s); fflush(dbf)
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| 230 | #define DEBUGTERM "/dev/ttyp0"
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| 231 | FILE *dbf;
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| 232 | #else
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| 233 | #define debug(s) /* nothing */
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| 234 | #endif
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| 235 |
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| 236 |
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| 237 | /*
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| 238 | * output error messages
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| 239 | */
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| 240 | static void error(const char *fmt, ...) ATTRIBUTE_NORETURN;
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| 241 | static void error(const char *fmt, ...)
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| 242 | {
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| 243 | va_list va_alist;
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| 244 | char buf[256];
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| 245 |
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| 246 | #ifdef CONFIG_SYSLOGD
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| 247 | va_start(va_alist, fmt);
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| 248 | vsnprintf(buf, sizeof(buf), fmt, va_alist);
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| 249 | openlog(bb_applet_name, 0, LOG_AUTH);
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| 250 | syslog(LOG_ERR, "%s", buf);
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| 251 | closelog();
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| 252 | #else
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| 253 | int fd;
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| 254 | size_t l;
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| 255 |
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| 256 | snprintf(buf, sizeof(buf), "%s: ", bb_applet_name);
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| 257 | l = strlen(buf);
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| 258 | va_start(va_alist, fmt);
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| 259 | vsnprintf(buf + l, sizeof(buf) - l, fmt, va_alist);
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| 260 | l = strlen(buf);
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| 261 | /* truncate if need */
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| 262 | if((l + 3) > sizeof(buf))
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| 263 | l = sizeof(buf) - 3;
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| 264 | /* add \r\n always */
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| 265 | buf[l++] = '\r';
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| 266 | buf[l++] = '\n';
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| 267 | buf[l] = 0;
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| 268 | if ((fd = open("/dev/console", 1)) >= 0) {
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| 269 | write(fd, buf, l);
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| 270 | close(fd);
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| 271 | }
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| 272 | #endif
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| 273 |
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| 274 | va_end(va_alist);
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| 275 |
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| 276 | (void) sleep((unsigned) 10); /* be kind to init(8) */
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| 277 | exit(1);
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| 278 | }
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| 279 |
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| 280 |
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| 281 |
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| 282 | /* bcode - convert speed string to speed code; return 0 on failure */
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| 283 | static int bcode(const char *s)
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| 284 | {
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| 285 | int r;
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| 286 | unsigned long value;
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| 287 | if (safe_strtoul((char *)s, &value)) {
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| 288 | return -1;
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| 289 | }
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| 290 | if ((r = tty_value_to_baud(value)) > 0) {
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| 291 | return r;
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| 292 | }
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| 293 | return 0;
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| 294 | }
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| 295 |
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| 296 |
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| 297 | /* parse_speeds - parse alternate baud rates */
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| 298 | static void parse_speeds(struct options *op, char *arg)
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| 299 | {
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| 300 | char *cp;
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| 301 |
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| 302 | debug("entered parse_speeds\n");
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| 303 | for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
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| 304 | if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
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| 305 | error("bad speed: %s", cp);
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| 306 | if (op->numspeed > MAX_SPEED)
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| 307 | error("too many alternate speeds");
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| 308 | }
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| 309 | debug("exiting parsespeeds\n");
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| 310 | }
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| 311 |
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| 312 |
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| 313 | /* parse-args - parse command-line arguments */
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| 314 | static void parse_args(int argc, char **argv, struct options *op)
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| 315 | {
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| 316 | char *ts;
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| 317 |
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| 318 | op->flags = bb_getopt_ulflags(argc, argv, opt_string,
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| 319 | &(op->initstring), &fakehost, &(op->issue),
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| 320 | &(op->login), &ts);
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| 321 | if(op->flags & F_INITSTRING) {
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| 322 | const char *p = op->initstring;
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| 323 | char *q;
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| 324 |
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| 325 | q = op->initstring = bb_xstrdup(op->initstring);
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| 326 | /* copy optarg into op->initstring decoding \ddd
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| 327 | octal codes into chars */
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| 328 | while (*p) {
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| 329 | if (*p == '\\') {
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| 330 | p++;
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| 331 | *q++ = bb_process_escape_sequence(&p);
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| 332 | } else {
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| 333 | *q++ = *p++;
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| 334 | }
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| 335 | }
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| 336 | *q = '\0';
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| 337 | }
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| 338 | op->flags ^= F_ISSUE; /* revert flag show /etc/issue */
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| 339 | if(op->flags & F_TIMEOUT) {
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| 340 | if ((op->timeout = atoi(ts)) <= 0)
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| 341 | error("bad timeout value: %s", ts);
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| 342 | }
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| 343 | debug("after getopt loop\n");
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| 344 | if (argc < optind + 2) /* check parameter count */
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| 345 | bb_show_usage();
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| 346 |
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| 347 | /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
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| 348 | if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
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| 349 | /* a number first, assume it's a speed (BSD style) */
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| 350 | parse_speeds(op, argv[optind++]); /* baud rate(s) */
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| 351 | op->tty = argv[optind]; /* tty name */
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| 352 | } else {
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| 353 | op->tty = argv[optind++]; /* tty name */
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| 354 | parse_speeds(op, argv[optind]); /* baud rate(s) */
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| 355 | }
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| 356 |
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| 357 | optind++;
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| 358 | if (argc > optind && argv[optind])
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| 359 | setenv("TERM", argv[optind], 1);
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| 360 |
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| 361 | debug("exiting parseargs\n");
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| 362 | }
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| 363 |
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| 364 | /* open_tty - set up tty as standard { input, output, error } */
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| 365 | static void open_tty(char *tty, struct termio *tp, int local)
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| 366 | {
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| 367 | int chdir_to_root = 0;
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| 368 |
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| 369 | /* Set up new standard input, unless we are given an already opened port. */
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| 370 |
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| 371 | if (strcmp(tty, "-")) {
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| 372 | struct stat st;
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| 373 | int fd;
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| 374 |
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| 375 | /* Sanity checks... */
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| 376 |
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| 377 | if (chdir("/dev"))
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| 378 | error("/dev: chdir() failed: %m");
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| 379 | chdir_to_root = 1;
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| 380 | if (stat(tty, &st) < 0)
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| 381 | error("/dev/%s: %m", tty);
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| 382 | if ((st.st_mode & S_IFMT) != S_IFCHR)
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| 383 | error("/dev/%s: not a character device", tty);
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| 384 |
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| 385 | /* Open the tty as standard input. */
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| 386 |
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| 387 | close(0);
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| 388 | debug("open(2)\n");
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| 389 | fd = open(tty, O_RDWR | O_NONBLOCK, 0);
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| 390 | if (fd != 0)
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| 391 | error("/dev/%s: cannot open as standard input: %m", tty);
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| 392 | } else {
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| 393 |
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| 394 | /*
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| 395 | * Standard input should already be connected to an open port. Make
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| 396 | * sure it is open for read/write.
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| 397 | */
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| 398 |
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| 399 | if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR)
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| 400 | error("%s: not open for read/write", tty);
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| 401 | }
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| 402 |
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| 403 | /* Replace current standard output/error fd's with new ones */
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| 404 | debug("duping\n");
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| 405 | if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1 ||
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| 406 | dup2(STDIN_FILENO, STDERR_FILENO) == -1)
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| 407 | error("%s: dup problem: %m", tty); /* we have a problem */
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| 408 |
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| 409 | /*
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| 410 | * The following ioctl will fail if stdin is not a tty, but also when
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| 411 | * there is noise on the modem control lines. In the latter case, the
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| 412 | * common course of action is (1) fix your cables (2) give the modem more
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| 413 | * time to properly reset after hanging up. SunOS users can achieve (2)
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| 414 | * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
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| 415 | * 5 seconds seems to be a good value.
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| 416 | */
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| 417 |
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| 418 | if (ioctl(0, TCGETA, tp) < 0)
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| 419 | error("%s: ioctl: %m", tty);
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| 420 |
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| 421 | /*
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| 422 | * It seems to be a terminal. Set proper protections and ownership. Mode
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| 423 | * 0622 is suitable for SYSV <4 because /bin/login does not change
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| 424 | * protections. SunOS 4 login will change the protections to 0620 (write
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| 425 | * access for group tty) after the login has succeeded.
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| 426 | */
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| 427 |
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| 428 | #ifdef DEBIAN
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| 429 | {
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| 430 | /* tty to root.dialout 660 */
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| 431 | struct group *gr;
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| 432 | int id;
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| 433 |
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| 434 | id = (gr = getgrnam("dialout")) ? gr->gr_gid : 0;
|
---|
| 435 | chown(tty, 0, id);
|
---|
| 436 | chmod(tty, 0660);
|
---|
| 437 |
|
---|
| 438 | /* vcs,vcsa to root.sys 600 */
|
---|
| 439 | if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
|
---|
| 440 | char *vcs, *vcsa;
|
---|
| 441 |
|
---|
| 442 | if (!(vcs = strdup(tty)))
|
---|
| 443 | error("Can't malloc for vcs");
|
---|
| 444 | if (!(vcsa = malloc(strlen(tty) + 2)))
|
---|
| 445 | error("Can't malloc for vcsa");
|
---|
| 446 | strcpy(vcs, "vcs");
|
---|
| 447 | strcpy(vcs + 3, tty + 3);
|
---|
| 448 | strcpy(vcsa, "vcsa");
|
---|
| 449 | strcpy(vcsa + 4, tty + 3);
|
---|
| 450 |
|
---|
| 451 | id = (gr = getgrnam("sys")) ? gr->gr_gid : 0;
|
---|
| 452 | chown(vcs, 0, id);
|
---|
| 453 | chmod(vcs, 0600);
|
---|
| 454 | chown(vcsa, 0, id);
|
---|
| 455 | chmod(vcs, 0600);
|
---|
| 456 |
|
---|
| 457 | free(vcs);
|
---|
| 458 | free(vcsa);
|
---|
| 459 | }
|
---|
| 460 | }
|
---|
| 461 | #else
|
---|
| 462 | (void) chown(tty, 0, 0); /* root, sys */
|
---|
| 463 | (void) chmod(tty, 0622); /* crw--w--w- */
|
---|
| 464 | #endif
|
---|
| 465 | if(chdir_to_root && chdir("/"))
|
---|
| 466 | error("chdir to / failed: %m");
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | /* termio_init - initialize termio settings */
|
---|
| 470 | static void termio_init(struct termio *tp, int speed, struct options *op)
|
---|
| 471 | {
|
---|
| 472 | /*
|
---|
| 473 | * Initial termio settings: 8-bit characters, raw-mode, blocking i/o.
|
---|
| 474 | * Special characters are set after we have read the login name; all
|
---|
| 475 | * reads will be done in raw mode anyway. Errors will be dealt with
|
---|
| 476 | * lateron.
|
---|
| 477 | */
|
---|
| 478 | #ifdef __linux__
|
---|
| 479 | /* flush input and output queues, important for modems! */
|
---|
| 480 | (void) ioctl(0, TCFLSH, TCIOFLUSH);
|
---|
| 481 | #endif
|
---|
| 482 |
|
---|
| 483 | tp->c_cflag = CS8 | HUPCL | CREAD | speed;
|
---|
| 484 | if (op->flags & F_LOCAL) {
|
---|
| 485 | tp->c_cflag |= CLOCAL;
|
---|
| 486 | }
|
---|
| 487 |
|
---|
[904] | 488 | tp->c_iflag = tp->c_lflag = tp->c_line = 0;
|
---|
| 489 | tp->c_oflag = OPOST | ONLCR;
|
---|
[821] | 490 | tp->c_cc[VMIN] = 1;
|
---|
| 491 | tp->c_cc[VTIME] = 0;
|
---|
| 492 |
|
---|
| 493 | /* Optionally enable hardware flow control */
|
---|
| 494 |
|
---|
| 495 | #ifdef CRTSCTS
|
---|
| 496 | if (op->flags & F_RTSCTS)
|
---|
| 497 | tp->c_cflag |= CRTSCTS;
|
---|
| 498 | #endif
|
---|
| 499 |
|
---|
| 500 | (void) ioctl(0, TCSETA, tp);
|
---|
| 501 |
|
---|
| 502 | /* go to blocking input even in local mode */
|
---|
| 503 | fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
|
---|
| 504 |
|
---|
| 505 | debug("term_io 2\n");
|
---|
| 506 | }
|
---|
| 507 |
|
---|
| 508 | /* auto_baud - extract baud rate from modem status message */
|
---|
| 509 | static void auto_baud(struct termio *tp)
|
---|
| 510 | {
|
---|
| 511 | int speed;
|
---|
| 512 | int vmin;
|
---|
| 513 | unsigned iflag;
|
---|
| 514 | char buf[BUFSIZ];
|
---|
| 515 | char *bp;
|
---|
| 516 | int nread;
|
---|
| 517 |
|
---|
| 518 | /*
|
---|
| 519 | * This works only if the modem produces its status code AFTER raising
|
---|
| 520 | * the DCD line, and if the computer is fast enough to set the proper
|
---|
| 521 | * baud rate before the message has gone by. We expect a message of the
|
---|
| 522 | * following format:
|
---|
| 523 | *
|
---|
| 524 | * <junk><number><junk>
|
---|
| 525 | *
|
---|
| 526 | * The number is interpreted as the baud rate of the incoming call. If the
|
---|
| 527 | * modem does not tell us the baud rate within one second, we will keep
|
---|
| 528 | * using the current baud rate. It is advisable to enable BREAK
|
---|
| 529 | * processing (comma-separated list of baud rates) if the processing of
|
---|
| 530 | * modem status messages is enabled.
|
---|
| 531 | */
|
---|
| 532 |
|
---|
| 533 | /*
|
---|
| 534 | * Use 7-bit characters, don't block if input queue is empty. Errors will
|
---|
| 535 | * be dealt with lateron.
|
---|
| 536 | */
|
---|
| 537 |
|
---|
| 538 | iflag = tp->c_iflag;
|
---|
| 539 | tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
|
---|
| 540 | vmin = tp->c_cc[VMIN];
|
---|
| 541 | tp->c_cc[VMIN] = 0; /* don't block if queue empty */
|
---|
| 542 | (void) ioctl(0, TCSETA, tp);
|
---|
| 543 |
|
---|
| 544 | /*
|
---|
| 545 | * Wait for a while, then read everything the modem has said so far and
|
---|
| 546 | * try to extract the speed of the dial-in call.
|
---|
| 547 | */
|
---|
| 548 |
|
---|
| 549 | (void) sleep(1);
|
---|
| 550 | if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) {
|
---|
| 551 | buf[nread] = '\0';
|
---|
| 552 | for (bp = buf; bp < buf + nread; bp++) {
|
---|
| 553 | if (isascii(*bp) && isdigit(*bp)) {
|
---|
| 554 | if ((speed = bcode(bp))) {
|
---|
| 555 | tp->c_cflag &= ~CBAUD;
|
---|
| 556 | tp->c_cflag |= speed;
|
---|
| 557 | }
|
---|
| 558 | break;
|
---|
| 559 | }
|
---|
| 560 | }
|
---|
| 561 | }
|
---|
| 562 | /* Restore terminal settings. Errors will be dealt with lateron. */
|
---|
| 563 |
|
---|
| 564 | tp->c_iflag = iflag;
|
---|
| 565 | tp->c_cc[VMIN] = vmin;
|
---|
| 566 | (void) ioctl(0, TCSETA, tp);
|
---|
| 567 | }
|
---|
| 568 |
|
---|
| 569 | /* next_speed - select next baud rate */
|
---|
| 570 | static void next_speed(struct termio *tp, struct options *op)
|
---|
| 571 | {
|
---|
| 572 | static int baud_index = FIRST_SPEED; /* current speed index */
|
---|
| 573 |
|
---|
| 574 | baud_index = (baud_index + 1) % op->numspeed;
|
---|
| 575 | tp->c_cflag &= ~CBAUD;
|
---|
| 576 | tp->c_cflag |= op->speeds[baud_index];
|
---|
| 577 | (void) ioctl(0, TCSETA, tp);
|
---|
| 578 | }
|
---|
| 579 |
|
---|
| 580 |
|
---|
| 581 | /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
|
---|
| 582 | static void do_prompt(struct options *op, struct termio *tp)
|
---|
| 583 | {
|
---|
| 584 | #ifdef ISSUE /* optional: show /etc/issue */
|
---|
| 585 | print_login_issue(op->issue, op->tty);
|
---|
| 586 | #endif
|
---|
| 587 | print_login_prompt();
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 | /* caps_lock - string contains upper case without lower case */
|
---|
| 591 | /* returns 1 if true, 0 if false */
|
---|
| 592 | static int caps_lock(const char *s)
|
---|
| 593 | {
|
---|
| 594 | int capslock;
|
---|
| 595 |
|
---|
| 596 | for (capslock = 0; *s; s++) {
|
---|
| 597 | if (islower(*s))
|
---|
| 598 | return (0);
|
---|
| 599 | if (capslock == 0)
|
---|
| 600 | capslock = isupper(*s);
|
---|
| 601 | }
|
---|
| 602 | return (capslock);
|
---|
| 603 | }
|
---|
| 604 |
|
---|
| 605 | #define logname bb_common_bufsiz1
|
---|
| 606 | /* get_logname - get user name, establish parity, speed, erase, kill, eol */
|
---|
| 607 | /* return NULL on failure, logname on success */
|
---|
| 608 | static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp)
|
---|
| 609 | {
|
---|
| 610 | char *bp;
|
---|
| 611 | char c; /* input character, full eight bits */
|
---|
| 612 | char ascval; /* low 7 bits of input character */
|
---|
| 613 | int bits; /* # of "1" bits per character */
|
---|
| 614 | int mask; /* mask with 1 bit up */
|
---|
| 615 | static char *erase[] = { /* backspace-space-backspace */
|
---|
| 616 | "\010\040\010", /* space parity */
|
---|
| 617 | "\010\040\010", /* odd parity */
|
---|
| 618 | "\210\240\210", /* even parity */
|
---|
| 619 | "\210\240\210", /* no parity */
|
---|
| 620 | };
|
---|
| 621 |
|
---|
| 622 | /* Initialize kill, erase, parity etc. (also after switching speeds). */
|
---|
| 623 |
|
---|
| 624 | *cp = init_chardata;
|
---|
| 625 |
|
---|
| 626 | /* Flush pending input (esp. after parsing or switching the baud rate). */
|
---|
| 627 |
|
---|
| 628 | (void) sleep(1);
|
---|
| 629 | (void) ioctl(0, TCFLSH, TCIFLUSH);
|
---|
| 630 |
|
---|
| 631 | /* Prompt for and read a login name. */
|
---|
| 632 |
|
---|
| 633 | for (*logname = 0; *logname == 0; /* void */ ) {
|
---|
| 634 |
|
---|
| 635 | /* Write issue file and prompt, with "parity" bit == 0. */
|
---|
| 636 |
|
---|
| 637 | do_prompt(op, tp);
|
---|
| 638 |
|
---|
| 639 | /* Read name, watch for break, parity, erase, kill, end-of-line. */
|
---|
| 640 |
|
---|
| 641 | for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
|
---|
| 642 |
|
---|
| 643 | /* Do not report trivial EINTR/EIO errors. */
|
---|
| 644 |
|
---|
| 645 | if (read(0, &c, 1) < 1) {
|
---|
| 646 | if (errno == EINTR || errno == EIO)
|
---|
| 647 | exit(0);
|
---|
| 648 | error("%s: read: %m", op->tty);
|
---|
| 649 | }
|
---|
| 650 | /* Do BREAK handling elsewhere. */
|
---|
| 651 |
|
---|
| 652 | if ((c == 0) && op->numspeed > 1)
|
---|
| 653 | /* return (0); */
|
---|
| 654 | return NULL;
|
---|
| 655 |
|
---|
| 656 | /* Do parity bit handling. */
|
---|
| 657 |
|
---|
| 658 | if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
|
---|
| 659 | for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
|
---|
| 660 | if (mask & ascval)
|
---|
| 661 | bits++; /* count "1" bits */
|
---|
| 662 | cp->parity |= ((bits & 1) ? 1 : 2);
|
---|
| 663 | }
|
---|
| 664 | /* Do erase, kill and end-of-line processing. */
|
---|
| 665 |
|
---|
| 666 | switch (ascval) {
|
---|
| 667 | case CR:
|
---|
| 668 | case NL:
|
---|
| 669 | *bp = 0; /* terminate logname */
|
---|
| 670 | cp->eol = ascval; /* set end-of-line char */
|
---|
| 671 | break;
|
---|
| 672 | case BS:
|
---|
| 673 | case DEL:
|
---|
| 674 | case '#':
|
---|
| 675 | cp->erase = ascval; /* set erase character */
|
---|
| 676 | if (bp > logname) {
|
---|
| 677 | (void) write(1, erase[cp->parity], 3);
|
---|
| 678 | bp--;
|
---|
| 679 | }
|
---|
| 680 | break;
|
---|
| 681 | case CTL('U'):
|
---|
| 682 | case '@':
|
---|
| 683 | cp->kill = ascval; /* set kill character */
|
---|
| 684 | while (bp > logname) {
|
---|
| 685 | (void) write(1, erase[cp->parity], 3);
|
---|
| 686 | bp--;
|
---|
| 687 | }
|
---|
| 688 | break;
|
---|
| 689 | case CTL('D'):
|
---|
| 690 | exit(0);
|
---|
| 691 | default:
|
---|
| 692 | if (!isascii(ascval) || !isprint(ascval)) {
|
---|
| 693 | /* ignore garbage characters */ ;
|
---|
| 694 | } else if (bp - logname >= sizeof(logname) - 1) {
|
---|
| 695 | error("%s: input overrun", op->tty);
|
---|
| 696 | } else {
|
---|
| 697 | (void) write(1, &c, 1); /* echo the character */
|
---|
| 698 | *bp++ = ascval; /* and store it */
|
---|
| 699 | }
|
---|
| 700 | break;
|
---|
| 701 | }
|
---|
| 702 | }
|
---|
| 703 | }
|
---|
| 704 | /* Handle names with upper case and no lower case. */
|
---|
| 705 |
|
---|
| 706 | if ((cp->capslock = caps_lock(logname))) {
|
---|
| 707 | for (bp = logname; *bp; bp++)
|
---|
| 708 | if (isupper(*bp))
|
---|
| 709 | *bp = tolower(*bp); /* map name to lower case */
|
---|
| 710 | }
|
---|
| 711 | return (logname);
|
---|
| 712 | }
|
---|
| 713 |
|
---|
| 714 | /* termio_final - set the final tty mode bits */
|
---|
| 715 | static void termio_final(struct options *op, struct termio *tp, struct chardata *cp)
|
---|
| 716 | {
|
---|
| 717 | /* General terminal-independent stuff. */
|
---|
| 718 |
|
---|
| 719 | tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
|
---|
| 720 | tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
|
---|
| 721 | /* no longer| ECHOCTL | ECHOPRT */
|
---|
| 722 | tp->c_oflag |= OPOST;
|
---|
| 723 | /* tp->c_cflag = 0; */
|
---|
| 724 | tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
|
---|
| 725 | tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
|
---|
| 726 | tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
|
---|
| 727 | tp->c_cc[VEOL] = DEF_EOL;
|
---|
| 728 | tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
|
---|
| 729 |
|
---|
| 730 | /* Account for special characters seen in input. */
|
---|
| 731 |
|
---|
| 732 | if (cp->eol == CR) {
|
---|
| 733 | tp->c_iflag |= ICRNL; /* map CR in input to NL */
|
---|
| 734 | tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
|
---|
| 735 | }
|
---|
| 736 | tp->c_cc[VERASE] = cp->erase; /* set erase character */
|
---|
| 737 | tp->c_cc[VKILL] = cp->kill; /* set kill character */
|
---|
| 738 |
|
---|
| 739 | /* Account for the presence or absence of parity bits in input. */
|
---|
| 740 |
|
---|
| 741 | switch (cp->parity) {
|
---|
| 742 | case 0: /* space (always 0) parity */
|
---|
| 743 | break;
|
---|
| 744 | case 1: /* odd parity */
|
---|
| 745 | tp->c_cflag |= PARODD;
|
---|
| 746 | /* FALLTHROUGH */
|
---|
| 747 | case 2: /* even parity */
|
---|
| 748 | tp->c_cflag |= PARENB;
|
---|
| 749 | tp->c_iflag |= INPCK | ISTRIP;
|
---|
| 750 | /* FALLTHROUGH */
|
---|
| 751 | case (1 | 2): /* no parity bit */
|
---|
| 752 | tp->c_cflag &= ~CSIZE;
|
---|
| 753 | tp->c_cflag |= CS7;
|
---|
| 754 | break;
|
---|
| 755 | }
|
---|
| 756 | /* Account for upper case without lower case. */
|
---|
| 757 |
|
---|
| 758 | if (cp->capslock) {
|
---|
| 759 | tp->c_iflag |= IUCLC;
|
---|
| 760 | tp->c_lflag |= XCASE;
|
---|
| 761 | tp->c_oflag |= OLCUC;
|
---|
| 762 | }
|
---|
| 763 | /* Optionally enable hardware flow control */
|
---|
| 764 |
|
---|
| 765 | #ifdef CRTSCTS
|
---|
| 766 | if (op->flags & F_RTSCTS)
|
---|
| 767 | tp->c_cflag |= CRTSCTS;
|
---|
| 768 | #endif
|
---|
| 769 |
|
---|
| 770 | /* Finally, make the new settings effective */
|
---|
| 771 |
|
---|
| 772 | if (ioctl(0, TCSETA, tp) < 0)
|
---|
| 773 | error("%s: ioctl: TCSETA: %m", op->tty);
|
---|
| 774 | }
|
---|
| 775 |
|
---|
| 776 |
|
---|
| 777 | #ifdef SYSV_STYLE
|
---|
| 778 | #ifdef CONFIG_FEATURE_UTMP
|
---|
| 779 | /* update_utmp - update our utmp entry */
|
---|
| 780 | static void update_utmp(char *line)
|
---|
| 781 | {
|
---|
| 782 | struct utmp ut;
|
---|
| 783 | struct utmp *utp;
|
---|
| 784 | time_t t;
|
---|
| 785 | int mypid = getpid();
|
---|
| 786 | #if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
|
---|
| 787 | struct flock lock;
|
---|
| 788 | #endif
|
---|
| 789 |
|
---|
| 790 | /*
|
---|
| 791 | * The utmp file holds miscellaneous information about things started by
|
---|
| 792 | * /sbin/init and other system-related events. Our purpose is to update
|
---|
| 793 | * the utmp entry for the current process, in particular the process type
|
---|
| 794 | * and the tty line we are listening to. Return successfully only if the
|
---|
| 795 | * utmp file can be opened for update, and if we are able to find our
|
---|
| 796 | * entry in the utmp file.
|
---|
| 797 | */
|
---|
| 798 | if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
|
---|
| 799 | close(creat(_PATH_UTMP, 0664));
|
---|
| 800 | }
|
---|
| 801 | utmpname(_PATH_UTMP);
|
---|
| 802 | setutent();
|
---|
| 803 | while ((utp = getutent())
|
---|
| 804 | && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
|
---|
| 805 | ;
|
---|
| 806 |
|
---|
| 807 | if (utp) {
|
---|
| 808 | memcpy(&ut, utp, sizeof(ut));
|
---|
| 809 | } else {
|
---|
| 810 | /* some inits don't initialize utmp... */
|
---|
| 811 | memset(&ut, 0, sizeof(ut));
|
---|
| 812 | safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
|
---|
| 813 | }
|
---|
| 814 | /*endutent(); */
|
---|
| 815 |
|
---|
| 816 | strcpy(ut.ut_user, "LOGIN");
|
---|
| 817 | safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
|
---|
| 818 | if (fakehost)
|
---|
| 819 | safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
|
---|
| 820 | time(&t);
|
---|
| 821 | ut.ut_time = t;
|
---|
| 822 | ut.ut_type = LOGIN_PROCESS;
|
---|
| 823 | ut.ut_pid = mypid;
|
---|
| 824 |
|
---|
| 825 | pututline(&ut);
|
---|
| 826 | endutent();
|
---|
| 827 |
|
---|
| 828 | #ifdef CONFIG_FEATURE_WTMP
|
---|
| 829 | if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
|
---|
| 830 | close(creat(bb_path_wtmp_file, 0664));
|
---|
| 831 | updwtmp(bb_path_wtmp_file, &ut);
|
---|
| 832 | #endif
|
---|
| 833 | }
|
---|
| 834 |
|
---|
| 835 | #endif /* CONFIG_FEATURE_UTMP */
|
---|
| 836 | #endif /* SYSV_STYLE */
|
---|
| 837 |
|
---|
| 838 |
|
---|
| 839 | #undef logname
|
---|
| 840 | int getty_main(int argc, char **argv)
|
---|
| 841 | {
|
---|
| 842 | char *logname = NULL; /* login name, given to /bin/login */
|
---|
| 843 | struct chardata chardata; /* set by get_logname() */
|
---|
| 844 | struct termio termio; /* terminal mode bits */
|
---|
| 845 | static struct options options = {
|
---|
| 846 | 0, /* show /etc/issue (SYSV_STYLE) */
|
---|
| 847 | 0, /* no timeout */
|
---|
| 848 | _PATH_LOGIN, /* default login program */
|
---|
| 849 | "tty1", /* default tty line */
|
---|
| 850 | "", /* modem init string */
|
---|
| 851 | #ifdef ISSUE
|
---|
| 852 | ISSUE, /* default issue file */
|
---|
| 853 | #else
|
---|
| 854 | NULL,
|
---|
| 855 | #endif
|
---|
| 856 | 0, /* no baud rates known yet */
|
---|
| 857 | };
|
---|
| 858 |
|
---|
| 859 | #ifdef DEBUGGING
|
---|
| 860 | dbf = bb_xfopen(DEBUGTERM, "w");
|
---|
| 861 |
|
---|
| 862 | {
|
---|
| 863 | int i;
|
---|
| 864 |
|
---|
| 865 | for (i = 1; i < argc; i++) {
|
---|
| 866 | debug(argv[i]);
|
---|
| 867 | debug("\n");
|
---|
| 868 | }
|
---|
| 869 | }
|
---|
| 870 | #endif
|
---|
| 871 |
|
---|
| 872 | /* Parse command-line arguments. */
|
---|
| 873 |
|
---|
| 874 | parse_args(argc, argv, &options);
|
---|
| 875 |
|
---|
| 876 | #ifdef __linux__
|
---|
| 877 | setsid();
|
---|
| 878 | #endif
|
---|
| 879 |
|
---|
| 880 | /* Update the utmp file. */
|
---|
| 881 |
|
---|
| 882 |
|
---|
| 883 | #ifdef SYSV_STYLE
|
---|
| 884 | #ifdef CONFIG_FEATURE_UTMP
|
---|
| 885 | update_utmp(options.tty);
|
---|
| 886 | #endif
|
---|
| 887 | #endif
|
---|
| 888 |
|
---|
| 889 | debug("calling open_tty\n");
|
---|
| 890 | /* Open the tty as standard { input, output, error }. */
|
---|
| 891 | open_tty(options.tty, &termio, options.flags & F_LOCAL);
|
---|
| 892 |
|
---|
| 893 | #ifdef __linux__
|
---|
| 894 | {
|
---|
| 895 | int iv;
|
---|
| 896 |
|
---|
| 897 | iv = getpid();
|
---|
| 898 | ioctl(0, TIOCSPGRP, &iv);
|
---|
| 899 | }
|
---|
| 900 | #endif
|
---|
| 901 | /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
|
---|
| 902 | debug("calling termio_init\n");
|
---|
| 903 | termio_init(&termio, options.speeds[FIRST_SPEED], &options);
|
---|
| 904 |
|
---|
| 905 | /* write the modem init string and DON'T flush the buffers */
|
---|
| 906 | if (options.flags & F_INITSTRING) {
|
---|
| 907 | debug("writing init string\n");
|
---|
| 908 | write(1, options.initstring, strlen(options.initstring));
|
---|
| 909 | }
|
---|
| 910 |
|
---|
| 911 | if (!(options.flags & F_LOCAL)) {
|
---|
| 912 | /* go to blocking write mode unless -L is specified */
|
---|
| 913 | fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
|
---|
| 914 | }
|
---|
| 915 |
|
---|
| 916 | /* Optionally detect the baud rate from the modem status message. */
|
---|
| 917 | debug("before autobaud\n");
|
---|
| 918 | if (options.flags & F_PARSE)
|
---|
| 919 | auto_baud(&termio);
|
---|
| 920 |
|
---|
| 921 | /* Set the optional timer. */
|
---|
| 922 | if (options.timeout)
|
---|
| 923 | (void) alarm((unsigned) options.timeout);
|
---|
| 924 |
|
---|
| 925 | /* optionally wait for CR or LF before writing /etc/issue */
|
---|
| 926 | if (options.flags & F_WAITCRLF) {
|
---|
| 927 | char ch;
|
---|
| 928 |
|
---|
| 929 | debug("waiting for cr-lf\n");
|
---|
| 930 | while (read(0, &ch, 1) == 1) {
|
---|
| 931 | ch &= 0x7f; /* strip "parity bit" */
|
---|
| 932 | #ifdef DEBUGGING
|
---|
| 933 | fprintf(dbf, "read %c\n", ch);
|
---|
| 934 | #endif
|
---|
| 935 | if (ch == '\n' || ch == '\r')
|
---|
| 936 | break;
|
---|
| 937 | }
|
---|
| 938 | }
|
---|
| 939 |
|
---|
| 940 | chardata = init_chardata;
|
---|
| 941 | if (!(options.flags & F_NOPROMPT)) {
|
---|
| 942 | /* Read the login name. */
|
---|
| 943 | debug("reading login name\n");
|
---|
| 944 | /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
|
---|
| 945 | while ((logname = get_logname(&options, &chardata, &termio)) ==
|
---|
| 946 | NULL) next_speed(&termio, &options);
|
---|
| 947 | }
|
---|
| 948 |
|
---|
| 949 | /* Disable timer. */
|
---|
| 950 |
|
---|
| 951 | if (options.timeout)
|
---|
| 952 | (void) alarm(0);
|
---|
| 953 |
|
---|
| 954 | /* Finalize the termio settings. */
|
---|
| 955 |
|
---|
| 956 | termio_final(&options, &termio, &chardata);
|
---|
| 957 |
|
---|
| 958 | /* Now the newline character should be properly written. */
|
---|
| 959 |
|
---|
| 960 | (void) write(1, "\n", 1);
|
---|
| 961 |
|
---|
| 962 | /* Let the login program take care of password validation. */
|
---|
| 963 |
|
---|
| 964 | (void) execl(options.login, options.login, "--", logname, (char *) 0);
|
---|
| 965 | error("%s: can't exec %s: %m", options.tty, options.login);
|
---|
| 966 | }
|
---|
| 967 |
|
---|