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448
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1 /*
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2 * Copyright (c) 2000, Red Hat, Inc.
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; either version 2 of the License, or
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7 * (at your option) any later version.
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8 *
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9 * A copy of the GNU General Public License can be found at
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10 * http://www.gnu.org/
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11 *
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12 * Written by DJ Delorie <dj@cygnus.com>
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13 *
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14 */
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15
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16 /* Built-in tar functionality. See tar.h for usage. */
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17
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18 #include <stdio.h>
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19 #include <stdlib.h>
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20 #include <sys/types.h>
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21 #include <sys/stat.h>
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22
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23 #include "win32.h"
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24 #include <zlib.h>
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25 #include "tar.h"
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26 #include "mkdir.h"
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27 #include "log.h"
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28
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29 #include "port.h"
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30
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31 #if defined(CYGWIN) || defined(MINGW)
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32 #define FACTOR (0x19db1ded53ea710LL)
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33 #define NSPERSEC 10000000LL
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34 #else
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35 __int64 FACTOR=0x19db1ded53ea710L;
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36 __int64 NSPERSEC=10000000L;
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37 #endif
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38 #define SYMLINK_COOKIE "!<symlink>"
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39
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40 typedef struct {
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41 char name[100]; /* 0 */
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42 char mode[8]; /* 100 */
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43 char uid[8]; /* 108 */
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44 char gid[8]; /* 116 */
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45 char size[12]; /* 124 */
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46 char mtime[12]; /* 136 */
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47 char chksum[8]; /* 148 */
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48 char typeflag; /* 156 */
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49 char linkname[100]; /* 157 */
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50 char magic[6]; /* 257 */
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51 char version[2]; /* 263 */
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52 char uname[32]; /* 265 */
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53 char gname[32]; /* 297 */
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54 char devmajor[8]; /* 329 */
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55 char devminor[8]; /* 337 */
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56 char prefix[155]; /* 345 */
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57 char junk[12]; /* 500 */
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58 } tar_header_type;
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59
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60 typedef struct tar_map_result_type_s {
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61 struct tar_map_result_type_s *next;
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62 char *stored_name;
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63 char *mapped_name;
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64 } tar_map_result_type;
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65
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66 static tar_map_result_type *tar_map_result = 0;
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67
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68 static int err;
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69
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70 static char file_name[_MAX_PATH+512];
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71 static char have_longname = 0;
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72 static int file_length;
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73
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74 static tar_header_type tar_header;
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75 static char buf[512];
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76
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77 static int _tar_file_size = 0;
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78 int _tar_verbose = 0;
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79 FILE * _tar_vfile = 0;
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80 #define vp if (_tar_verbose) fprintf
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81 #define vp2 if (_tar_verbose>1) fprintf
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82
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83 static gzFile g = 0;
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84
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85 static char *
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86 xstrdup (char *c)
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87 {
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88 char *r = (char *) malloc (strlen (c) + 1);
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89 if (!r)
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90 exit_setup (1);
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91 strcpy (r, c);
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92 return r;
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93 }
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94
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95 int
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96 tar_open (char *pathname)
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97 {
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98 struct stat s;
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99 if (_tar_vfile == 0)
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100 _tar_vfile = stderr;
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101
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102 vp2 (_tar_vfile, "tar: open `%s'\n", pathname);
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103 if (stat (pathname, &s) < 0)
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104 return 1;
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105 _tar_file_size = s.st_size;
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106
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107 g = gzopen (pathname, "rb");
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108 if (sizeof (tar_header) != 512)
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109 {
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110 /* drastic, but important */
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111 fprintf (stderr, "compilation error: tar header struct not 512"
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112 " bytes (it's %d)\n", sizeof (tar_header));
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113 exit_setup (1);
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114 }
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115 err = 0;
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116 return g ? 0 : 1;
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117 }
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118
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119 int
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120 tar_ftell ()
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121 {
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122 return gztell (g);
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123 }
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124
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125 static void
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126 skip_file ()
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127 {
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128 while (file_length > 0)
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129 {
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130 gzread (g, buf, 512);
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131 file_length -= 512;
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132 }
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133 }
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134
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135 char *
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136 tar_next_file ()
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137 {
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138 int r, n;
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139 char *c;
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140 r = gzread (g, &tar_header, 512);
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141
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142 /* See if we're at end of file */
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143 if (r != 512)
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144 return 0;
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145
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146 /* See if the header is all zeros (i.e. last block) */
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147 n = 0;
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148 for (r = 512/sizeof (int); r; r--)
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149 n |= ((int *)&tar_header)[r-1];
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150 if (n == 0)
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151 return 0;
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152
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153 if (!have_longname && tar_header.typeflag != 'L')
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154 {
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155 memcpy (file_name, tar_header.name, 100);
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156 file_name[100] = 0;
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157 }
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158
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159 sscanf (tar_header.size, "%o", &file_length);
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160
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161 vp2 (_tar_vfile, "%c %9d %s\n", tar_header.typeflag, file_length, file_name);
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162
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163 switch (tar_header.typeflag)
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164 {
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165 case 'L': /* GNU tar long name extension */
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166 if (file_length > _MAX_PATH)
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167 {
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168 skip_file ();
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169 fprintf (stderr, "error: long file name exceeds %d characters\n",
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170 _MAX_PATH);
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171 err ++;
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172 gzread (g, &tar_header, 512);
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173 sscanf (tar_header.size, "%o", &file_length);
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174 skip_file ();
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175 return tar_next_file ();
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176 }
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177 c = file_name;
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178 while (file_length > 0)
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179 {
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180 int need = file_length > 512 ? 512 : file_length;
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181 if (gzread (g, buf, 512) < 512)
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182 return 0;
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183 memcpy (c, buf, need);
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184 c += need;
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185 file_length -= need;
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186 }
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187 *c = 0;
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188 have_longname = 1;
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189 return tar_next_file ();
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190
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191 case '3': /* char */
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192 case '4': /* block */
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193 case '6': /* fifo */
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194 fprintf (stderr, "warning: not extracting special file %s\n",
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195 file_name);
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196 err ++;
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197 return tar_next_file ();
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198
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199 case '0': /* regular file */
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200 case 0: /* regular file also */
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201 case '2': /* symbolic link */
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202 case '5': /* directory */
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203 case '7': /* contiguous file */
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204 return file_name;
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205
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206 case '1': /* hard link, we just copy */
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207 return file_name;
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208
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209 default:
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210 fprintf (stderr, "error: unknown (or unsupported) file type `%c'\n",
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211 tar_header.typeflag);
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212 err ++;
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213 skip_file ();
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214 return tar_next_file ();
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215 }
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216 }
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217
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218 static void
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219 fix_time_stamp (char *path)
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220 {
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221 int mtime;
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222 #if defined(CYGWIN) || defined(MINGW)
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223 long long ftimev;
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224 #else
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225 __int64 ftimev;
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226 #endif
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227 FILETIME ftime;
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228 HANDLE h;
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229
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230 sscanf (tar_header.mtime, "%o", &mtime);
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231 ftimev = mtime * NSPERSEC + FACTOR;
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232 ftime.dwHighDateTime = ftimev >> 32;
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233 ftime.dwLowDateTime = ftimev;
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234 h = CreateFileA (path, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
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235 0, OPEN_EXISTING,
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236 FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, 0);
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237 if (h)
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238 {
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239 SetFileTime (h, 0, 0, &ftime);
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240 CloseHandle (h);
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241 }
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242 }
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243
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244 static FILE *
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245 common_fopen (char *path)
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246 {
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247 FILE *out;
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248 out = fopen (path, "wb");
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249 if (!out)
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250 {
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251 /* maybe we need to create a directory */
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252 if (mkdir_p (0, path))
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253 {
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254 skip_file ();
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255 return 0;
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256 }
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257 out = fopen (path, "wb");
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258 }
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259 if (!out)
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260 {
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261 fprintf (stderr, "unable to write to file %s\n", path);
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262 perror ("The error was");
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263 skip_file ();
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264 return 0;
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265 }
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266 return out;
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267 }
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268
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269 static void
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270 prepare_for_file (char *path)
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271 {
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272 DWORD w;
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273 mkdir_p (0, path);
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274
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275 w = GetFileAttributes (path);
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276 if (w != 0xffffffff && w & FILE_ATTRIBUTE_DIRECTORY)
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277 {
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278 char *tmp = (char *) malloc (strlen (path) + 10);
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279 int i = 0;
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280 do {
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281 i++;
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282 sprintf (tmp, "%s.old-%d", path, i);
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283 } while (GetFileAttributes (tmp) != 0xffffffff);
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284 fprintf (stderr, "warning: moving directory \"%s\" out of the way.\n", path);
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285 MoveFile (path, tmp);
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286 free (tmp);
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287 }
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288
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289 DeleteFileA (path);
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290 }
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291
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292 int
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293 tar_read_file (char *path)
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294 {
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295 FILE *out, *copy;
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296 HANDLE h;
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297 DWORD w;
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298 int got;
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299 tar_map_result_type *tmr;
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300
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301 switch (tar_header.typeflag)
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302 {
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303 case '0': /* regular files */
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304 case 0:
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305 case '7':
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306 vp (_tar_vfile, "F %s\n", path);
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307 prepare_for_file (path);
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308 out = common_fopen (path);
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309 if (!out)
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310 return 1;
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311
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312 while (file_length > 0)
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313 {
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314 int put;
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315 int want = file_length > 512 ? 512 : file_length;
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316 got = gzread (g, buf, 512);
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317 if (got < 512)
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318 {
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319 fprintf (stderr, "tar: unexpected end of file reading %s\n", path);
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320 fclose (out);
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321 remove (path);
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322 return 1;
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323 }
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324 put = fwrite (buf, 1, want, out);
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325 if (put < want)
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326 {
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327 fprintf (stderr, "tar: out of disk space writing %s\n", path);
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328 fclose (out);
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329 remove (path);
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330 skip_file ();
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331 return 1;
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332 }
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333 file_length -= want;
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334 }
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335 fclose (out);
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336
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337 fix_time_stamp (path);
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338
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339 /* we need this to do hard links below */
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340 tmr = (tar_map_result_type *) malloc (sizeof (tar_map_result_type));
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341 tmr->next = tar_map_result;
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342 tmr->stored_name = xstrdup (file_name);
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343 tmr->mapped_name = xstrdup (path);
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344 tar_map_result = tmr;
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345
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346 return 0;
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347
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348 case '1': /* hard links; we just copy */
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349 for (tmr = tar_map_result; tmr; tmr=tmr->next)
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350 if (strcmp (tmr->stored_name, tar_header.linkname) == 0)
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351 break;
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352 if (!tmr)
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353 {
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354 fprintf (stderr, "tar: can't find %s to link %s to\n",
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355 tar_header.linkname, path);
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356 return 1;
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357 }
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358 vp (_tar_vfile, "H %s <- %s\n", path, tmr->mapped_name);
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359 prepare_for_file (path);
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360 copy = fopen (tmr->mapped_name, "rb");
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361 if (!copy)
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362 {
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363 fprintf (stderr, "tar: unable to read %s\n", tmr->mapped_name);
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364 return 1;
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365 }
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366 out = common_fopen (path);
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367 if (!out)
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368 return 1;
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369
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370 while ((got = fread (buf, 1, 512, copy)) > 0)
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371 {
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372 int put = fwrite (buf, 1, got, out);
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373 if (put < got)
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374 {
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375 fprintf (stderr, "tar: out of disk space writing %s\n", path);
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376 fclose (out);
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377 fclose (copy);
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378 remove (path);
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379 return 1;
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380 }
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381 }
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382 fclose (out);
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383 fclose (copy);
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384
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385 fix_time_stamp (path);
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386 return 0;
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387
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388 case '5': /* directories */
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389 vp (_tar_vfile, "D %s\n", path);
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390 while (path[0] && path[strlen (path)-1] == '/')
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391 path[strlen (path) - 1] = 0;
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392 return mkdir_p (1, path);
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393
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394
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395 case '2': /* symbolic links */
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396 vp (_tar_vfile, "L %s -> %s\n", path, tar_header.linkname);
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397 prepare_for_file (path);
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398 h = CreateFileA (path, GENERIC_WRITE, 0, 0, CREATE_NEW,
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399 FILE_ATTRIBUTE_NORMAL, 0);
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400 if (h == INVALID_HANDLE_VALUE)
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401 {
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402 fprintf (stderr, "error: unable to create symlink \"%s\" -> \"%s\"\n",
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403 path, tar_header.linkname);
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404 return 1;
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405 }
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406 strcpy (buf, SYMLINK_COOKIE);
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407 strcat (buf, tar_header.linkname);
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408 if (WriteFile (h, buf, strlen (buf) + 1, &w, NULL))
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409 {
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410 CloseHandle (h);
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411 SetFileAttributesA (path, FILE_ATTRIBUTE_SYSTEM);
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412 return 0;
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413 }
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414 CloseHandle (h);
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415 fprintf (stderr, "error: unable to write symlink \"%s\"\n", path);
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416 DeleteFileA (path);
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417 return 1;
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418 }
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419
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420 return 0;
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421 }
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422
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423 int
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424 tar_close ()
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425 {
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426 #if 0
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427 while (tar_map_result)
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428 {
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429 tar_map_result_type *t = tar_map_result->next;
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430 free (tar_map_result->stored_name);
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431 free (tar_map_result->mapped_name);
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432 free (tar_map_result);
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433 tar_map_result = t;
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434 }
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435 #endif
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436 tar_map_result = 0;
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437
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438 if (gzclose (g))
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439 err ++;
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440 return err; /* includes errors for skipped files, etc */
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441 }
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442
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443 typedef struct {
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444 char *from;
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445 int from_len;
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446 char *to;
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447 int to_len;
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448 } map_type;
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449
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450 static map_type *map;
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451 static int nmaps;
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452
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453 int
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454 tar_auto (char *pathname, char **maplist)
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455 {
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456 char *c;
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457 int errcount = 0;
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458 int i, j;
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459 map_type mtemp;
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460 char newname[_MAX_PATH+512];
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461 static char twiddles[] = "|\b/\b-\b\\\b";
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462 int t = 0;
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463
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464 for (nmaps=0; maplist[nmaps*2]; nmaps++) ;
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465 map = (map_type *) malloc ((nmaps+1) * sizeof (map_type));
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466 for (nmaps=0; maplist[nmaps*2]; nmaps++)
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467 {
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468 map[nmaps].from = maplist[nmaps*2];
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469 map[nmaps].from_len = strlen (maplist[nmaps*2]);
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470 map[nmaps].to = maplist[nmaps*2+1];
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471 map[nmaps].to_len = strlen (maplist[nmaps*2+1]);
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472 }
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473 /* bubble sort - expect the maps to be short */
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474 for (i=0; i<nmaps-1; i++)
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475 for (j=i+1; j<nmaps; j++)
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476 if (map[i].from_len < map[j].from_len)
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|
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477 {
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478 mtemp = map[i];
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|
479 map[i] = map[j];
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480 map[j] = mtemp;
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|
|
481 }
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|
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482
|
|
|
483 if ((tar_open (pathname)))
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|
|
484 return 1;
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|
|
485 while (c = tar_next_file ())
|
|
|
486 {
|
|
|
487 int l = strlen (c);
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|
|
488 for (i=0; i<nmaps; i++)
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|
|
489 if (l >= map[i].from_len
|
|
|
490 && strncmp (c, map[i].from, map[i].from_len) == 0)
|
|
|
491 {
|
|
|
492 strcpy (newname, map[i].to);
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|
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493 strcpy (newname+map[i].to_len, c + map[i].from_len);
|
|
|
494 c = newname;
|
|
|
495 break;
|
|
|
496 }
|
|
|
497
|
|
|
498 t = (t+2) % 8;
|
|
|
499 fwrite (twiddles+t, 1, 2, stderr);
|
|
|
500
|
|
|
501 if (tar_read_file (c))
|
|
|
502 errcount ++;
|
|
|
503 }
|
|
|
504 if (tar_close ())
|
|
|
505 errcount ++;
|
|
|
506
|
|
|
507 fwrite (" \b", 1, 2, stderr);
|
|
|
508
|
|
|
509 vp2 (_tar_vfile, "tar_auto returns %d\n", errcount);
|
|
|
510 return errcount;
|
|
|
511 }
|
