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