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;
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435 | chown(tty, 0, id);
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436 | chmod(tty, 0660);
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437 |
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438 | /* vcs,vcsa to root.sys 600 */
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439 | if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
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440 | char *vcs, *vcsa;
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441 |
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442 | if (!(vcs = strdup(tty)))
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443 | error("Can't malloc for vcs");
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444 | if (!(vcsa = malloc(strlen(tty) + 2)))
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445 | error("Can't malloc for vcsa");
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446 | strcpy(vcs, "vcs");
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447 | strcpy(vcs + 3, tty + 3);
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448 | strcpy(vcsa, "vcsa");
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449 | strcpy(vcsa + 4, tty + 3);
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450 |
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451 | id = (gr = getgrnam("sys")) ? gr->gr_gid : 0;
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452 | chown(vcs, 0, id);
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453 | chmod(vcs, 0600);
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454 | chown(vcsa, 0, id);
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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 |
|
---|
488 | tp->c_iflag = tp->c_lflag = tp->c_line = 0;
|
---|
489 | tp->c_oflag = OPOST | ONLCR;
|
---|
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 |
|
---|