1 | /* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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2 | *
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3 | * FIXME:
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4 | * In privileged mode if uname and gname map to a uid and gid then use the
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5 | * mapped value instead of the uid/gid values in tar header
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6 | *
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7 | * References:
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8 | * GNU tar and star man pages,
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9 | * Opengroup's ustar interchange format,
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10 | * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
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11 | */
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12 |
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13 | #include <stdio.h>
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14 | #include <stdlib.h>
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15 | #include <string.h>
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16 | #include <sys/sysmacros.h> /* For makedev */
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17 | #include "unarchive.h"
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18 | #include "libbb.h"
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19 |
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20 | #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
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21 | static char *longname = NULL;
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22 | static char *linkname = NULL;
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23 | #endif
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24 |
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25 | char get_header_tar(archive_handle_t *archive_handle)
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26 | {
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27 | file_header_t *file_header = archive_handle->file_header;
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28 | union {
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29 | /* ustar header, Posix 1003.1 */
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30 | unsigned char raw[512];
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31 | struct {
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32 | char name[100]; /* 0-99 */
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33 | char mode[8]; /* 100-107 */
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34 | char uid[8]; /* 108-115 */
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35 | char gid[8]; /* 116-123 */
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36 | char size[12]; /* 124-135 */
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37 | char mtime[12]; /* 136-147 */
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38 | char chksum[8]; /* 148-155 */
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39 | char typeflag; /* 156-156 */
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40 | char linkname[100]; /* 157-256 */
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41 | char magic[6]; /* 257-262 */
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42 | char version[2]; /* 263-264 */
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43 | char uname[32]; /* 265-296 */
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44 | char gname[32]; /* 297-328 */
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45 | char devmajor[8]; /* 329-336 */
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46 | char devminor[8]; /* 337-344 */
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47 | char prefix[155]; /* 345-499 */
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48 | char padding[12]; /* 500-512 */
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49 | } formated;
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50 | } tar;
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51 | long sum = 0;
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52 | long i;
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53 | static int end = 0;
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54 |
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55 | /* Align header */
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56 | data_align(archive_handle, 512);
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57 |
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58 | if (bb_full_read(archive_handle->src_fd, tar.raw, 512) != 512) {
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59 | /* Assume end of file */
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60 | bb_error_msg_and_die("Short header");
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61 | //return(EXIT_FAILURE);
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62 | }
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63 | archive_handle->offset += 512;
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64 |
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65 | /* If there is no filename its an empty header */
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66 | if (tar.formated.name[0] == 0) {
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67 | if (end) {
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68 | /* This is the second consecutive empty header! End of archive!
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69 | * Read until the end to empty the pipe from gz or bz2
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70 | */
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71 | while (bb_full_read(archive_handle->src_fd, tar.raw, 512) == 512);
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72 | return(EXIT_FAILURE);
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73 | }
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74 | end = 1;
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75 | return(EXIT_SUCCESS);
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76 | }
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77 | end = 0;
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78 |
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79 | /* Check header has valid magic, "ustar" is for the proper tar
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80 | * 0's are for the old tar format
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81 | */
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82 | if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
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83 | #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY
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84 | if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
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85 | #endif
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86 | bb_error_msg_and_die("Invalid tar magic");
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87 | }
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88 | /* Do checksum on headers */
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89 | for (i = 0; i < 148 ; i++) {
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90 | sum += tar.raw[i];
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91 | }
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92 | sum += ' ' * 8;
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93 | for (i = 156; i < 512 ; i++) {
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94 | sum += tar.raw[i];
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95 | }
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96 | if (sum != strtol(tar.formated.chksum, NULL, 8)) {
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97 | bb_error_msg("Invalid tar header checksum");
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98 | return(EXIT_FAILURE);
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99 | }
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100 |
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101 | #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
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102 | if (longname) {
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103 | file_header->name = longname;
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104 | longname = NULL;
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105 | }
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106 | else if (linkname) {
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107 | file_header->name = linkname;
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108 | linkname = NULL;
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109 | } else
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110 | #endif
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111 | {
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112 | file_header->name = bb_xstrndup(tar.formated.name,100);
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113 |
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114 | if (tar.formated.prefix[0]) {
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115 | char *temp = file_header->name;
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116 | file_header->name = concat_path_file(tar.formated.prefix, temp);
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117 | free(temp);
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118 | }
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119 | }
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120 |
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121 | file_header->uid = strtol(tar.formated.uid, NULL, 8);
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122 | file_header->gid = strtol(tar.formated.gid, NULL, 8);
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123 | file_header->size = strtol(tar.formated.size, NULL, 8);
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124 | file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
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125 | file_header->link_name = (tar.formated.linkname[0] != '\0') ?
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126 | bb_xstrdup(tar.formated.linkname) : NULL;
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127 | file_header->device = makedev(strtol(tar.formated.devmajor, NULL, 8),
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128 | strtol(tar.formated.devminor, NULL, 8));
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129 |
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130 | /* Set bits 0-11 of the files mode */
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131 | file_header->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
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132 |
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133 | /* Set bits 12-15 of the files mode */
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134 | switch (tar.formated.typeflag) {
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135 | /* busybox identifies hard links as being regular files with 0 size and a link name */
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136 | case '1':
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137 | file_header->mode |= S_IFREG;
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138 | break;
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139 | case '7':
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140 | /* Reserved for high performance files, treat as normal file */
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141 | case 0:
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142 | case '0':
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143 | #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY
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144 | if (last_char_is(file_header->name, '/')) {
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145 | file_header->mode |= S_IFDIR;
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146 | } else
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147 | #endif
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148 | file_header->mode |= S_IFREG;
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149 | break;
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150 | case '2':
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151 | file_header->mode |= S_IFLNK;
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152 | break;
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153 | case '3':
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154 | file_header->mode |= S_IFCHR;
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155 | break;
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156 | case '4':
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157 | file_header->mode |= S_IFBLK;
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158 | break;
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159 | case '5':
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160 | file_header->mode |= S_IFDIR;
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161 | break;
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162 | case '6':
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163 | file_header->mode |= S_IFIFO;
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164 | break;
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165 | #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
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166 | case 'L': {
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167 | longname = xzalloc(file_header->size + 1);
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168 | archive_xread_all(archive_handle, longname, file_header->size);
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169 | archive_handle->offset += file_header->size;
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170 |
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171 | return(get_header_tar(archive_handle));
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172 | }
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173 | case 'K': {
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174 | linkname = xzalloc(file_header->size + 1);
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175 | archive_xread_all(archive_handle, linkname, file_header->size);
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176 | archive_handle->offset += file_header->size;
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177 |
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178 | file_header->name = linkname;
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179 | return(get_header_tar(archive_handle));
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180 | }
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181 | case 'D': /* GNU dump dir */
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182 | case 'M': /* Continuation of multi volume archive*/
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183 | case 'N': /* Old GNU for names > 100 characters */
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184 | case 'S': /* Sparse file */
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185 | case 'V': /* Volume header */
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186 | #endif
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187 | case 'g': /* pax global header */
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188 | case 'x': /* pax extended header */
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189 | bb_error_msg("Ignoring extension type %c", tar.formated.typeflag);
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190 | break;
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191 | default:
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192 | bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
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193 | }
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194 | { /* Strip trailing '/' in directories */
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195 | /* Must be done after mode is set as '/' is used to check if its a directory */
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196 | char *tmp = last_char_is(file_header->name, '/');
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197 | if (tmp) {
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198 | *tmp = '\0';
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199 | }
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200 | }
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201 |
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202 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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203 | archive_handle->action_header(archive_handle->file_header);
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204 | archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
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205 | archive_handle->action_data(archive_handle);
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206 | llist_add_to(&(archive_handle->passed), file_header->name);
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207 | } else {
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208 | data_skip(archive_handle);
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209 | }
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210 | archive_handle->offset += file_header->size;
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211 |
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212 | free(file_header->link_name);
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213 |
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214 | return(EXIT_SUCCESS);
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215 | }
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