1 | /* |
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2 | * utils.c - various utility functions used in pppd. |
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3 | * |
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4 | * Copyright (c) 1999 The Australian National University. |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms are permitted |
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8 | * provided that the above copyright notice and this paragraph are |
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9 | * duplicated in all such forms and that any documentation, |
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10 | * advertising materials, and other materials related to such |
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11 | * distribution and use acknowledge that the software was developed |
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12 | * by the Australian National University. The name of the University |
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13 | * may not be used to endorse or promote products derived from this |
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14 | * software without specific prior written permission. |
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15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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18 | */ |
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19 | |
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20 | #define RCSID "$Id$" |
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21 | |
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22 | #include <stdio.h> |
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23 | #include <ctype.h> |
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24 | #include <stdlib.h> |
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25 | #include <string.h> |
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26 | #include <unistd.h> |
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27 | #include <signal.h> |
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28 | #include <errno.h> |
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29 | #include <fcntl.h> |
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30 | #include <netdb.h> |
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31 | #include <syslog.h> |
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32 | #include <pwd.h> |
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33 | #include <sys/param.h> |
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34 | #include <sys/types.h> |
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35 | #include <sys/wait.h> |
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36 | #include <sys/time.h> |
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37 | #include <sys/resource.h> |
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38 | #include <sys/stat.h> |
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39 | #include <sys/socket.h> |
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40 | #include <netinet/in.h> |
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41 | #ifdef SVR4 |
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42 | #include <sys/mkdev.h> |
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43 | #endif |
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44 | |
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45 | #include "pppd.h" |
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46 | |
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47 | static const char rcsid[] = RCSID; |
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48 | |
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49 | #if defined(SUNOS4) |
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50 | extern char *strerror(); |
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51 | #endif |
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52 | |
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53 | static void pr_log __P((void *, char *, ...)); |
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54 | static void logit __P((int, char *, va_list)); |
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55 | static void vslp_printer __P((void *, char *, ...)); |
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56 | static void format_packet __P((u_char *, int, void (*) (void *, char *, ...), |
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57 | void *)); |
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58 | |
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59 | struct buffer_info { |
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60 | char *ptr; |
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61 | int len; |
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62 | }; |
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63 | |
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64 | /* |
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65 | * slprintf - format a message into a buffer. Like sprintf except we |
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66 | * also specify the length of the output buffer, and we handle |
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67 | * %r (recursive format), %m (error message), %v (visible string), |
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68 | * %q (quoted string), %t (current time) and %I (IP address) formats. |
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69 | * Doesn't do floating-point formats. |
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70 | * Returns the number of chars put into buf. |
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71 | */ |
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72 | int |
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73 | slprintf __V((char *buf, int buflen, char *fmt, ...)) |
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74 | { |
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75 | va_list args; |
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76 | int n; |
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77 | |
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78 | #if defined(__STDC__) |
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79 | va_start(args, fmt); |
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80 | #else |
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81 | char *buf; |
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82 | int buflen; |
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83 | char *fmt; |
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84 | va_start(args); |
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85 | buf = va_arg(args, char *); |
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86 | buflen = va_arg(args, int); |
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87 | fmt = va_arg(args, char *); |
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88 | #endif |
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89 | n = vslprintf(buf, buflen, fmt, args); |
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90 | va_end(args); |
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91 | return n; |
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92 | } |
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93 | |
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94 | /* |
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95 | * vslprintf - like slprintf, takes a va_list instead of a list of args. |
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96 | */ |
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97 | #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0) |
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98 | |
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99 | int |
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100 | vslprintf(buf, buflen, fmt, args) |
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101 | char *buf; |
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102 | int buflen; |
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103 | char *fmt; |
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104 | va_list args; |
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105 | { |
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106 | int c, i, n; |
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107 | int width, prec, fillch; |
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108 | int base, len, neg, quoted; |
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109 | unsigned long val = 0; |
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110 | char *str, *f, *buf0; |
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111 | unsigned char *p; |
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112 | char num[32]; |
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113 | time_t t; |
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114 | u_int32_t ip; |
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115 | static char hexchars[] = "0123456789abcdef"; |
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116 | struct buffer_info bufinfo; |
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117 | |
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118 | buf0 = buf; |
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119 | --buflen; |
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120 | while (buflen > 0) { |
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121 | for (f = fmt; *f != '%' && *f != 0; ++f) |
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122 | ; |
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123 | if (f > fmt) { |
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124 | len = f - fmt; |
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125 | if (len > buflen) |
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126 | len = buflen; |
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127 | memcpy(buf, fmt, len); |
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128 | buf += len; |
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129 | buflen -= len; |
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130 | fmt = f; |
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131 | } |
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132 | if (*fmt == 0) |
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133 | break; |
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134 | c = *++fmt; |
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135 | width = 0; |
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136 | prec = -1; |
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137 | fillch = ' '; |
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138 | if (c == '0') { |
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139 | fillch = '0'; |
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140 | c = *++fmt; |
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141 | } |
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142 | if (c == '*') { |
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143 | width = va_arg(args, int); |
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144 | c = *++fmt; |
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145 | } else { |
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146 | while (isdigit(c)) { |
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147 | width = width * 10 + c - '0'; |
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148 | c = *++fmt; |
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149 | } |
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150 | } |
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151 | if (c == '.') { |
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152 | c = *++fmt; |
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153 | if (c == '*') { |
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154 | prec = va_arg(args, int); |
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155 | c = *++fmt; |
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156 | } else { |
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157 | prec = 0; |
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158 | while (isdigit(c)) { |
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159 | prec = prec * 10 + c - '0'; |
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160 | c = *++fmt; |
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161 | } |
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162 | } |
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163 | } |
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164 | str = 0; |
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165 | base = 0; |
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166 | neg = 0; |
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167 | ++fmt; |
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168 | switch (c) { |
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169 | case 'd': |
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170 | i = va_arg(args, int); |
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171 | if (i < 0) { |
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172 | neg = 1; |
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173 | val = -i; |
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174 | } else |
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175 | val = i; |
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176 | base = 10; |
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177 | break; |
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178 | case 'o': |
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179 | val = va_arg(args, unsigned int); |
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180 | base = 8; |
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181 | break; |
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182 | case 'x': |
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183 | case 'X': |
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184 | val = va_arg(args, unsigned int); |
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185 | base = 16; |
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186 | break; |
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187 | case 'p': |
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188 | val = (unsigned long) va_arg(args, void *); |
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189 | base = 16; |
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190 | neg = 2; |
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191 | break; |
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192 | case 's': |
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193 | str = va_arg(args, char *); |
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194 | break; |
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195 | case 'c': |
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196 | num[0] = va_arg(args, int); |
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197 | num[1] = 0; |
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198 | str = num; |
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199 | break; |
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200 | case 'm': |
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201 | str = strerror(errno); |
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202 | break; |
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203 | case 'I': |
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204 | ip = va_arg(args, u_int32_t); |
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205 | ip = ntohl(ip); |
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206 | slprintf(num, sizeof(num), "%d.%d.%d.%d", (ip >> 24) & 0xff, |
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207 | (ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff); |
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208 | str = num; |
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209 | break; |
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210 | case 'r': |
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211 | f = va_arg(args, char *); |
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212 | #if !defined(__PPC__) |
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213 | n = vslprintf(buf, buflen + 1, f, va_arg(args, va_list)); |
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214 | #else |
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215 | /* HACK: On the powerpc, a va_list is an array of 1 structure */ |
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216 | n = vslprintf(buf, buflen + 1, f, va_arg(args, void *)); |
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217 | #endif |
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218 | buf += n; |
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219 | buflen -= n; |
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220 | continue; |
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221 | case 't': |
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222 | time(&t); |
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223 | str = ctime(&t); |
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224 | str += 4; /* chop off the day name */ |
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225 | str[15] = 0; /* chop off year and newline */ |
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226 | break; |
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227 | case 'v': /* "visible" string */ |
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228 | case 'q': /* quoted string */ |
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229 | quoted = c == 'q'; |
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230 | p = va_arg(args, unsigned char *); |
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231 | if (fillch == '0' && prec >= 0) { |
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232 | n = prec; |
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233 | } else { |
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234 | n = strlen((char *)p); |
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235 | if (prec >= 0 && n > prec) |
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236 | n = prec; |
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237 | } |
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238 | while (n > 0 && buflen > 0) { |
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239 | c = *p++; |
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240 | --n; |
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241 | if (!quoted && c >= 0x80) { |
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242 | OUTCHAR('M'); |
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243 | OUTCHAR('-'); |
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244 | c -= 0x80; |
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245 | } |
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246 | if (quoted && (c == '"' || c == '\\')) |
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247 | OUTCHAR('\\'); |
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248 | if (c < 0x20 || (0x7f <= c && c < 0xa0)) { |
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249 | if (quoted) { |
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250 | OUTCHAR('\\'); |
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251 | switch (c) { |
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252 | case '\t': OUTCHAR('t'); break; |
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253 | case '\n': OUTCHAR('n'); break; |
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254 | case '\b': OUTCHAR('b'); break; |
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255 | case '\f': OUTCHAR('f'); break; |
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256 | default: |
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257 | OUTCHAR('x'); |
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258 | OUTCHAR(hexchars[c >> 4]); |
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259 | OUTCHAR(hexchars[c & 0xf]); |
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260 | } |
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261 | } else { |
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262 | if (c == '\t') |
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263 | OUTCHAR(c); |
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264 | else { |
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265 | OUTCHAR('^'); |
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266 | OUTCHAR(c ^ 0x40); |
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267 | } |
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268 | } |
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269 | } else |
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270 | OUTCHAR(c); |
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271 | } |
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272 | continue; |
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273 | case 'P': /* print PPP packet */ |
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274 | bufinfo.ptr = buf; |
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275 | bufinfo.len = buflen + 1; |
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276 | p = va_arg(args, unsigned char *); |
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277 | n = va_arg(args, int); |
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278 | format_packet(p, n, vslp_printer, &bufinfo); |
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279 | buf = bufinfo.ptr; |
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280 | buflen = bufinfo.len - 1; |
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281 | continue; |
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282 | case 'B': |
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283 | p = va_arg(args, unsigned char *); |
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284 | for (n = prec; n > 0; --n) { |
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285 | c = *p++; |
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286 | if (fillch == ' ') |
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287 | OUTCHAR(' '); |
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288 | OUTCHAR(hexchars[(c >> 4) & 0xf]); |
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289 | OUTCHAR(hexchars[c & 0xf]); |
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290 | } |
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291 | continue; |
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292 | default: |
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293 | *buf++ = '%'; |
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294 | if (c != '%') |
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295 | --fmt; /* so %z outputs %z etc. */ |
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296 | --buflen; |
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297 | continue; |
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298 | } |
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299 | if (base != 0) { |
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300 | str = num + sizeof(num); |
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301 | *--str = 0; |
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302 | while (str > num + neg) { |
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303 | *--str = hexchars[val % base]; |
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304 | val = val / base; |
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305 | if (--prec <= 0 && val == 0) |
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306 | break; |
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307 | } |
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308 | switch (neg) { |
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309 | case 1: |
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310 | *--str = '-'; |
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311 | break; |
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312 | case 2: |
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313 | *--str = 'x'; |
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314 | *--str = '0'; |
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315 | break; |
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316 | } |
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317 | len = num + sizeof(num) - 1 - str; |
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318 | } else { |
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319 | len = strlen(str); |
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320 | if (prec >= 0 && len > prec) |
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321 | len = prec; |
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322 | } |
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323 | if (width > 0) { |
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324 | if (width > buflen) |
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325 | width = buflen; |
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326 | if ((n = width - len) > 0) { |
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327 | buflen -= n; |
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328 | for (; n > 0; --n) |
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329 | *buf++ = fillch; |
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330 | } |
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331 | } |
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332 | if (len > buflen) |
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333 | len = buflen; |
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334 | memcpy(buf, str, len); |
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335 | buf += len; |
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336 | buflen -= len; |
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337 | } |
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338 | *buf = 0; |
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339 | return buf - buf0; |
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340 | } |
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341 | |
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342 | /* |
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343 | * vslp_printer - used in processing a %P format |
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344 | */ |
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345 | static void |
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346 | vslp_printer __V((void *arg, char *fmt, ...)) |
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347 | { |
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348 | int n; |
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349 | va_list pvar; |
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350 | struct buffer_info *bi; |
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351 | |
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352 | #if defined(__STDC__) |
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353 | va_start(pvar, fmt); |
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354 | #else |
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355 | void *arg; |
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356 | char *fmt; |
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357 | va_start(pvar); |
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358 | arg = va_arg(pvar, void *); |
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359 | fmt = va_arg(pvar, char *); |
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360 | #endif |
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361 | |
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362 | bi = (struct buffer_info *) arg; |
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363 | n = vslprintf(bi->ptr, bi->len, fmt, pvar); |
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364 | va_end(pvar); |
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365 | |
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366 | bi->ptr += n; |
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367 | bi->len -= n; |
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368 | } |
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369 | |
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370 | /* |
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371 | * log_packet - format a packet and log it. |
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372 | */ |
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373 | |
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374 | char line[256]; /* line to be logged accumulated here */ |
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375 | char *linep; |
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376 | |
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377 | void |
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378 | log_packet(p, len, prefix, level) |
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379 | u_char *p; |
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380 | int len; |
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381 | char *prefix; |
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382 | int level; |
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383 | { |
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384 | strlcpy(line, prefix, sizeof(line)); |
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385 | linep = line + strlen(line); |
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386 | format_packet(p, len, pr_log, NULL); |
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387 | } |
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388 | |
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389 | /* |
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390 | * format_packet - make a readable representation of a packet, |
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391 | * calling `printer(arg, format, ...)' to output it. |
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392 | */ |
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393 | static void |
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394 | format_packet(p, len, printer, arg) |
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395 | u_char *p; |
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396 | int len; |
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397 | void (*printer) __P((void *, char *, ...)); |
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398 | void *arg; |
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399 | { |
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400 | int i, n; |
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401 | u_short proto; |
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402 | struct protent *protp; |
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403 | |
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404 | if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) { |
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405 | p += 2; |
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406 | GETSHORT(proto, p); |
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407 | len -= PPP_HDRLEN; |
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408 | for (i = 0; (protp = protocols[i]) != NULL; ++i) |
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409 | if (proto == protp->protocol) |
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410 | break; |
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411 | if (protp != NULL) { |
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412 | printer(arg, "[%s", protp->name); |
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413 | n = (*protp->printpkt)(p, len, printer, arg); |
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414 | printer(arg, "]"); |
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415 | p += n; |
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416 | len -= n; |
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417 | } else { |
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418 | for (i = 0; (protp = protocols[i]) != NULL; ++i) |
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419 | if (proto == (protp->protocol & ~0x8000)) |
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420 | break; |
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421 | if (protp != 0 && protp->data_name != 0) { |
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422 | printer(arg, "[%s data]", protp->data_name); |
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423 | if (len > 8) |
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424 | printer(arg, "%.8B ...", p); |
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425 | else |
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426 | printer(arg, "%.*B", len, p); |
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427 | len = 0; |
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428 | } else |
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429 | printer(arg, "[proto=0x%x]", proto); |
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430 | } |
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431 | } |
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432 | |
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433 | if (len > 32) |
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434 | printer(arg, "%.32B ...", p); |
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435 | else |
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436 | printer(arg, "%.*B", len, p); |
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437 | } |
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438 | |
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439 | static void |
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440 | pr_log __V((void *arg, char *fmt, ...)) |
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441 | { |
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442 | int n; |
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443 | va_list pvar; |
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444 | char buf[256]; |
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445 | |
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446 | #if defined(__STDC__) |
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447 | va_start(pvar, fmt); |
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448 | #else |
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449 | void *arg; |
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450 | char *fmt; |
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451 | va_start(pvar); |
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452 | arg = va_arg(pvar, void *); |
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453 | fmt = va_arg(pvar, char *); |
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454 | #endif |
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455 | |
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456 | n = vslprintf(buf, sizeof(buf), fmt, pvar); |
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457 | va_end(pvar); |
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458 | |
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459 | if (linep + n + 1 > line + sizeof(line)) { |
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460 | linep = line; |
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461 | } |
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462 | strlcpy(linep, buf, line + sizeof(line) - linep); |
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463 | linep += n; |
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464 | } |
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465 | |
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466 | /* |
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467 | * print_string - print a readable representation of a string using |
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468 | * printer. |
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469 | */ |
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470 | void |
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471 | print_string(p, len, printer, arg) |
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472 | char *p; |
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473 | int len; |
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474 | void (*printer) __P((void *, char *, ...)); |
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475 | void *arg; |
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476 | { |
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477 | int c; |
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478 | |
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479 | printer(arg, "\""); |
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480 | for (; len > 0; --len) { |
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481 | c = *p++; |
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482 | if (' ' <= c && c <= '~') { |
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483 | if (c == '\\' || c == '"') |
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484 | printer(arg, "\\"); |
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485 | printer(arg, "%c", c); |
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486 | } else { |
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487 | switch (c) { |
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488 | case '\n': |
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489 | printer(arg, "\\n"); |
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490 | break; |
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491 | case '\r': |
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492 | printer(arg, "\\r"); |
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493 | break; |
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494 | case '\t': |
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495 | printer(arg, "\\t"); |
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496 | break; |
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497 | default: |
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498 | printer(arg, "\\%.3o", c); |
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499 | } |
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500 | } |
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501 | } |
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502 | printer(arg, "\""); |
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503 | } |
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504 | |
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505 | /* |
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506 | * logit - does the hard work for fatal et al. |
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507 | */ |
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508 | static void |
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509 | logit(level, fmt, args) |
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510 | int level; |
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511 | char *fmt; |
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512 | va_list args; |
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513 | { |
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514 | int n; |
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515 | char buf[256]; |
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516 | |
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517 | n = vslprintf(buf, sizeof(buf), fmt, args); |
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518 | /* if (log_to_fd >= 0 && (level != LOG_DEBUG || debug)) { */ |
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519 | if (log_to_fd >= 0 && (debug)) { |
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520 | if (buf[n-1] != '\n') |
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521 | buf[n++] = '\n'; |
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522 | if (write(log_to_fd, buf, n) != n) |
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523 | log_to_fd = -1; |
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524 | } |
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525 | } |
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526 | |
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527 | /* |
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528 | * fatal - log an error message and die horribly. |
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529 | */ |
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530 | void |
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531 | pppd_fatal __V((char *fmt, ...)) |
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532 | { |
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533 | va_list pvar; |
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534 | |
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535 | #if defined(__STDC__) |
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536 | va_start(pvar, fmt); |
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537 | #else |
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538 | char *fmt; |
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539 | va_start(pvar); |
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540 | fmt = va_arg(pvar, char *); |
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541 | #endif |
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542 | |
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543 | logit(LOG_ERR, fmt, pvar); |
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544 | va_end(pvar); |
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545 | |
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546 | die(1); /* as promised */ |
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547 | } |
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548 | |
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549 | /* |
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550 | * error - log an error message. |
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551 | */ |
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552 | void |
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553 | pppd_error __V((char *fmt, ...)) |
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554 | { |
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555 | va_list pvar; |
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556 | |
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557 | #if defined(__STDC__) |
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558 | va_start(pvar, fmt); |
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559 | #else |
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560 | char *fmt; |
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561 | va_start(pvar); |
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562 | fmt = va_arg(pvar, char *); |
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563 | #endif |
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564 | |
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565 | logit(LOG_ERR, fmt, pvar); |
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566 | va_end(pvar); |
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567 | } |
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568 | |
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569 | /* |
---|
570 | * warn - log a warning message. |
---|
571 | */ |
---|
572 | void |
---|
573 | pppd_warn __V((char *fmt, ...)) |
---|
574 | { |
---|
575 | va_list pvar; |
---|
576 | |
---|
577 | #if defined(__STDC__) |
---|
578 | va_start(pvar, fmt); |
---|
579 | #else |
---|
580 | char *fmt; |
---|
581 | va_start(pvar); |
---|
582 | fmt = va_arg(pvar, char *); |
---|
583 | #endif |
---|
584 | |
---|
585 | logit(LOG_WARNING, fmt, pvar); |
---|
586 | va_end(pvar); |
---|
587 | } |
---|
588 | |
---|
589 | /* |
---|
590 | * notice - log a notice-level message. |
---|
591 | */ |
---|
592 | void |
---|
593 | pppd_notice __V((char *fmt, ...)) |
---|
594 | { |
---|
595 | va_list pvar; |
---|
596 | |
---|
597 | #if defined(__STDC__) |
---|
598 | va_start(pvar, fmt); |
---|
599 | #else |
---|
600 | char *fmt; |
---|
601 | va_start(pvar); |
---|
602 | fmt = va_arg(pvar, char *); |
---|
603 | #endif |
---|
604 | |
---|
605 | logit(LOG_NOTICE, fmt, pvar); |
---|
606 | va_end(pvar); |
---|
607 | } |
---|
608 | |
---|
609 | /* |
---|
610 | * info - log an informational message. |
---|
611 | */ |
---|
612 | void |
---|
613 | pppd_info __V((char *fmt, ...)) |
---|
614 | { |
---|
615 | va_list pvar; |
---|
616 | |
---|
617 | #if defined(__STDC__) |
---|
618 | va_start(pvar, fmt); |
---|
619 | #else |
---|
620 | char *fmt; |
---|
621 | va_start(pvar); |
---|
622 | fmt = va_arg(pvar, char *); |
---|
623 | #endif |
---|
624 | |
---|
625 | logit(LOG_INFO, fmt, pvar); |
---|
626 | va_end(pvar); |
---|
627 | } |
---|
628 | |
---|
629 | /* |
---|
630 | * dbglog - log a debug message. |
---|
631 | */ |
---|
632 | void |
---|
633 | pppd_dbglog __V((char *fmt, ...)) |
---|
634 | { |
---|
635 | va_list pvar; |
---|
636 | |
---|
637 | #if defined(__STDC__) |
---|
638 | va_start(pvar, fmt); |
---|
639 | #else |
---|
640 | char *fmt; |
---|
641 | va_start(pvar); |
---|
642 | fmt = va_arg(pvar, char *); |
---|
643 | #endif |
---|
644 | |
---|
645 | logit(LOG_DEBUG, fmt, pvar); |
---|
646 | va_end(pvar); |
---|
647 | } |
---|
648 | |
---|
649 | /* Procedures for locking the serial device using a lock file. */ |
---|
650 | #ifndef LOCK_DIR |
---|
651 | #ifdef _linux_ |
---|
652 | #define LOCK_DIR "/var/lock" |
---|
653 | #else |
---|
654 | #ifdef SVR4 |
---|
655 | #define LOCK_DIR "/var/spool/locks" |
---|
656 | #else |
---|
657 | #define LOCK_DIR "/var/spool/lock" |
---|
658 | #endif |
---|
659 | #endif |
---|
660 | #endif /* LOCK_DIR */ |
---|
661 | |
---|
662 | static char lock_file[MAXPATHLEN]; |
---|
663 | |
---|
664 | /* |
---|
665 | * lock - create a lock file for the named device |
---|
666 | */ |
---|
667 | int |
---|
668 | lock(dev) |
---|
669 | char *dev; |
---|
670 | { |
---|
671 | #ifdef LOCKLIB |
---|
672 | int result; |
---|
673 | |
---|
674 | result = mklock (dev, (void *) 0); |
---|
675 | if (result == 0) { |
---|
676 | strlcpy(lock_file, sizeof(lock_file), dev); |
---|
677 | return 0; |
---|
678 | } |
---|
679 | |
---|
680 | if (result > 0) |
---|
681 | notice("Device %s is locked by pid %d", dev, result); |
---|
682 | else |
---|
683 | error("Can't create lock file %s", lock_file); |
---|
684 | return -1; |
---|
685 | |
---|
686 | #else /* LOCKLIB */ |
---|
687 | |
---|
688 | char lock_buffer[12]; |
---|
689 | int fd, pid, n; |
---|
690 | |
---|
691 | #ifdef SVR4 |
---|
692 | struct stat sbuf; |
---|
693 | |
---|
694 | if (stat(dev, &sbuf) < 0) { |
---|
695 | error("Can't get device number for %s: %m", dev); |
---|
696 | return -1; |
---|
697 | } |
---|
698 | if ((sbuf.st_mode & S_IFMT) != S_IFCHR) { |
---|
699 | error("Can't lock %s: not a character device", dev); |
---|
700 | return -1; |
---|
701 | } |
---|
702 | slprintf(lock_file, sizeof(lock_file), "%s/LK.%03d.%03d.%03d", |
---|
703 | LOCK_DIR, major(sbuf.st_dev), |
---|
704 | major(sbuf.st_rdev), minor(sbuf.st_rdev)); |
---|
705 | #else |
---|
706 | char *p; |
---|
707 | |
---|
708 | if ((p = strrchr(dev, '/')) != NULL) |
---|
709 | dev = p + 1; |
---|
710 | slprintf(lock_file, sizeof(lock_file), "%s/LCK..%s", LOCK_DIR, dev); |
---|
711 | #endif |
---|
712 | |
---|
713 | while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) { |
---|
714 | if (errno != EEXIST) { |
---|
715 | error("Can't create lock file %s: %m", lock_file); |
---|
716 | break; |
---|
717 | } |
---|
718 | |
---|
719 | /* Read the lock file to find out who has the device locked. */ |
---|
720 | fd = open(lock_file, O_RDONLY, 0); |
---|
721 | if (fd < 0) { |
---|
722 | if (errno == ENOENT) /* This is just a timing problem. */ |
---|
723 | continue; |
---|
724 | error("Can't open existing lock file %s: %m", lock_file); |
---|
725 | break; |
---|
726 | } |
---|
727 | #ifndef LOCK_BINARY |
---|
728 | n = read(fd, lock_buffer, 11); |
---|
729 | #else |
---|
730 | n = read(fd, &pid, sizeof(pid)); |
---|
731 | #endif /* LOCK_BINARY */ |
---|
732 | close(fd); |
---|
733 | fd = -1; |
---|
734 | if (n <= 0) { |
---|
735 | error("Can't read pid from lock file %s", lock_file); |
---|
736 | break; |
---|
737 | } |
---|
738 | |
---|
739 | /* See if the process still exists. */ |
---|
740 | #ifndef LOCK_BINARY |
---|
741 | lock_buffer[n] = 0; |
---|
742 | pid = atoi(lock_buffer); |
---|
743 | #endif /* LOCK_BINARY */ |
---|
744 | if (pid == getpid()) |
---|
745 | return 1; /* somebody else locked it for us */ |
---|
746 | if (pid == 0 |
---|
747 | || (kill(pid, 0) == -1 && errno == ESRCH)) { |
---|
748 | if (unlink (lock_file) == 0) { |
---|
749 | notice("Removed stale lock on %s (pid %d)", dev, pid); |
---|
750 | continue; |
---|
751 | } |
---|
752 | warn("Couldn't remove stale lock on %s", dev); |
---|
753 | } else |
---|
754 | notice("Device %s is locked by pid %d", dev, pid); |
---|
755 | break; |
---|
756 | } |
---|
757 | |
---|
758 | if (fd < 0) { |
---|
759 | lock_file[0] = 0; |
---|
760 | return -1; |
---|
761 | } |
---|
762 | |
---|
763 | pid = getpid(); |
---|
764 | #ifndef LOCK_BINARY |
---|
765 | slprintf(lock_buffer, sizeof(lock_buffer), "%10d\n", pid); |
---|
766 | write (fd, lock_buffer, 11); |
---|
767 | #else |
---|
768 | write(fd, &pid, sizeof (pid)); |
---|
769 | #endif |
---|
770 | close(fd); |
---|
771 | return 0; |
---|
772 | |
---|
773 | #endif |
---|
774 | } |
---|
775 | |
---|
776 | /* |
---|
777 | * relock - called to update our lockfile when we are about to detach, |
---|
778 | * thus changing our pid (we fork, the child carries on, and the parent dies). |
---|
779 | * Note that this is called by the parent, with pid equal to the pid |
---|
780 | * of the child. This avoids a potential race which would exist if |
---|
781 | * we had the child rewrite the lockfile (the parent might die first, |
---|
782 | * and another process could think the lock was stale if it checked |
---|
783 | * between when the parent died and the child rewrote the lockfile). |
---|
784 | */ |
---|
785 | int |
---|
786 | relock(pid) |
---|
787 | int pid; |
---|
788 | { |
---|
789 | #ifdef LOCKLIB |
---|
790 | /* XXX is there a way to do this? */ |
---|
791 | return -1; |
---|
792 | #else /* LOCKLIB */ |
---|
793 | |
---|
794 | int fd; |
---|
795 | char lock_buffer[12]; |
---|
796 | |
---|
797 | if (lock_file[0] == 0) |
---|
798 | return -1; |
---|
799 | fd = open(lock_file, O_WRONLY, 0); |
---|
800 | if (fd < 0) { |
---|
801 | error("Couldn't reopen lock file %s: %m", lock_file); |
---|
802 | lock_file[0] = 0; |
---|
803 | return -1; |
---|
804 | } |
---|
805 | |
---|
806 | #ifndef LOCK_BINARY |
---|
807 | slprintf(lock_buffer, sizeof(lock_buffer), "%10d\n", pid); |
---|
808 | write (fd, lock_buffer, 11); |
---|
809 | #else |
---|
810 | write(fd, &pid, sizeof(pid)); |
---|
811 | #endif /* LOCK_BINARY */ |
---|
812 | close(fd); |
---|
813 | return 0; |
---|
814 | |
---|
815 | #endif /* LOCKLIB */ |
---|
816 | } |
---|
817 | |
---|
818 | /* |
---|
819 | * unlock - remove our lockfile |
---|
820 | */ |
---|
821 | void |
---|
822 | unlock() |
---|
823 | { |
---|
824 | if (lock_file[0]) { |
---|
825 | #ifdef LOCKLIB |
---|
826 | (void) rmlock(lock_file, (void *) 0); |
---|
827 | #else |
---|
828 | unlink(lock_file); |
---|
829 | #endif |
---|
830 | lock_file[0] = 0; |
---|
831 | } |
---|
832 | } |
---|