1 | /* vi: set sw=4 ts=4: */
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2 | /* Copyright 2002 Laurence Anderson
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3 | *
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4 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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5 | */
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6 |
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7 | #include "libbb.h"
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8 | #include "bb_archive.h"
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9 |
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10 | typedef struct hardlinks_t {
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11 | struct hardlinks_t *next;
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12 | int inode; /* TODO: must match maj/min too! */
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13 | int mode ;
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14 | int mtime; /* These three are useful only in corner case */
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15 | int uid ; /* of hardlinks with zero size body */
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16 | int gid ;
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17 | char name[1];
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18 | } hardlinks_t;
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19 |
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20 | char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
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21 | {
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22 | file_header_t *file_header = archive_handle->file_header;
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23 | char cpio_header[110];
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24 | int namesize;
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25 | int major, minor, nlink, mode, inode;
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26 | unsigned size, uid, gid, mtime;
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27 |
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28 | /* There can be padding before archive header */
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29 | data_align(archive_handle, 4);
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30 |
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31 | size = full_read(archive_handle->src_fd, cpio_header, 110);
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32 | if (size == 0) {
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33 | goto create_hardlinks;
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34 | }
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35 | if (size != 110) {
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36 | bb_error_msg_and_die("short read");
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37 | }
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38 | archive_handle->offset += 110;
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39 |
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40 | if (!is_prefixed_with(&cpio_header[0], "07070")
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41 | || (cpio_header[5] != '1' && cpio_header[5] != '2')
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42 | ) {
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43 | bb_error_msg_and_die("unsupported cpio format, use newc or crc");
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44 | }
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45 |
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46 | if (sscanf(cpio_header + 6,
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47 | "%8x" "%8x" "%8x" "%8x"
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48 | "%8x" "%8x" "%8x" /*maj,min:*/ "%*16c"
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49 | /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum: "%*8c"*/,
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50 | &inode, &mode, &uid, &gid,
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51 | &nlink, &mtime, &size,
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52 | &major, &minor, &namesize) != 10)
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53 | bb_error_msg_and_die("damaged cpio file");
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54 | file_header->mode = mode;
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55 | /* "cpio -R USER:GRP" support: */
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56 | if (archive_handle->cpio__owner.uid != (uid_t)-1L)
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57 | uid = archive_handle->cpio__owner.uid;
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58 | if (archive_handle->cpio__owner.gid != (gid_t)-1L)
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59 | gid = archive_handle->cpio__owner.gid;
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60 | file_header->uid = uid;
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61 | file_header->gid = gid;
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62 | file_header->mtime = mtime;
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63 | file_header->size = size;
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64 |
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65 | namesize &= 0x1fff; /* paranoia: limit names to 8k chars */
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66 | file_header->name = xzalloc(namesize + 1);
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67 | /* Read in filename */
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68 | xread(archive_handle->src_fd, file_header->name, namesize);
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69 | if (file_header->name[0] == '/') {
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70 | /* Testcase: echo /etc/hosts | cpio -pvd /tmp
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71 | * Without this code, it tries to unpack /etc/hosts
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72 | * into "/etc/hosts", not "etc/hosts".
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73 | */
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74 | char *p = file_header->name;
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75 | do p++; while (*p == '/');
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76 | overlapping_strcpy(file_header->name, p);
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77 | }
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78 | archive_handle->offset += namesize;
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79 |
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80 | /* Update offset amount and skip padding before file contents */
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81 | data_align(archive_handle, 4);
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82 |
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83 | if (strcmp(file_header->name, cpio_TRAILER) == 0) {
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84 | /* Always round up. ">> 9" divides by 512 */
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85 | archive_handle->cpio__blocks = (uoff_t)(archive_handle->offset + 511) >> 9;
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86 | goto create_hardlinks;
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87 | }
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88 |
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89 | file_header->link_target = NULL;
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90 | if (S_ISLNK(file_header->mode)) {
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91 | file_header->size &= 0x1fff; /* paranoia: limit names to 8k chars */
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92 | file_header->link_target = xzalloc(file_header->size + 1);
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93 | xread(archive_handle->src_fd, file_header->link_target, file_header->size);
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94 | archive_handle->offset += file_header->size;
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95 | file_header->size = 0; /* Stop possible seeks in future */
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96 | }
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97 |
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98 | // TODO: data_extract_all can't deal with hardlinks to non-files...
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99 | // when fixed, change S_ISREG to !S_ISDIR here
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100 |
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101 | if (nlink > 1 && S_ISREG(file_header->mode)) {
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102 | hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
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103 | new->inode = inode;
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104 | new->mode = mode ;
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105 | new->mtime = mtime;
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106 | new->uid = uid ;
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107 | new->gid = gid ;
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108 | strcpy(new->name, file_header->name);
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109 | /* Put file on a linked list for later */
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110 | if (size == 0) {
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111 | new->next = archive_handle->cpio__hardlinks_to_create;
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112 | archive_handle->cpio__hardlinks_to_create = new;
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113 | return EXIT_SUCCESS; /* Skip this one */
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114 | /* TODO: this breaks cpio -t (it does not show hardlinks) */
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115 | }
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116 | new->next = archive_handle->cpio__created_hardlinks;
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117 | archive_handle->cpio__created_hardlinks = new;
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118 | }
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119 | file_header->device = makedev(major, minor);
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120 |
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121 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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122 | archive_handle->action_data(archive_handle);
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123 | //TODO: run "echo /etc/hosts | cpio -pv /tmp" twice. On 2nd run:
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124 | //cpio: etc/hosts not created: newer or same age file exists
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125 | //etc/hosts <-- should NOT show it
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126 | //2 blocks <-- should say "0 blocks"
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127 | archive_handle->action_header(file_header);
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128 | } else {
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129 | data_skip(archive_handle);
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130 | }
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131 |
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132 | archive_handle->offset += file_header->size;
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133 |
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134 | free(file_header->link_target);
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135 | free(file_header->name);
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136 | file_header->link_target = NULL;
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137 | file_header->name = NULL;
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138 |
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139 | return EXIT_SUCCESS;
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140 |
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141 | create_hardlinks:
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142 | free(file_header->link_target);
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143 | free(file_header->name);
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144 |
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145 | while (archive_handle->cpio__hardlinks_to_create) {
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146 | hardlinks_t *cur;
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147 | hardlinks_t *make_me = archive_handle->cpio__hardlinks_to_create;
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148 |
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149 | archive_handle->cpio__hardlinks_to_create = make_me->next;
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150 |
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151 | memset(file_header, 0, sizeof(*file_header));
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152 | file_header->mtime = make_me->mtime;
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153 | file_header->name = make_me->name;
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154 | file_header->mode = make_me->mode;
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155 | file_header->uid = make_me->uid;
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156 | file_header->gid = make_me->gid;
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157 | /*file_header->size = 0;*/
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158 | /*file_header->link_target = NULL;*/
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159 |
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160 | /* Try to find a file we are hardlinked to */
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161 | cur = archive_handle->cpio__created_hardlinks;
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162 | while (cur) {
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163 | /* TODO: must match maj/min too! */
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164 | if (cur->inode == make_me->inode) {
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165 | file_header->link_target = cur->name;
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166 | /* link_target != NULL, size = 0: "I am a hardlink" */
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167 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
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168 | archive_handle->action_data(archive_handle);
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169 | free(make_me);
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170 | goto next_link;
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171 | }
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172 | cur = cur->next;
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173 | }
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174 | /* Oops... no file with such inode was created... do it now
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175 | * (happens when hardlinked files are empty (zero length)) */
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176 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
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177 | archive_handle->action_data(archive_handle);
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178 | /* Move to the list of created hardlinked files */
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179 | make_me->next = archive_handle->cpio__created_hardlinks;
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180 | archive_handle->cpio__created_hardlinks = make_me;
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181 | next_link: ;
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182 | }
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183 |
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184 | while (archive_handle->cpio__created_hardlinks) {
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185 | hardlinks_t *p = archive_handle->cpio__created_hardlinks;
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186 | archive_handle->cpio__created_hardlinks = p->next;
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187 | free(p);
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188 | }
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189 |
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190 | return EXIT_FAILURE; /* "No more files to process" */
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191 | }
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