1 | /* Copyright 2002 Laurence Anderson
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2 | *
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3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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4 | */
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5 |
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6 | #include <stdio.h>
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7 | #include <stdlib.h>
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8 | #include <string.h>
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9 | #include <unistd.h>
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10 | #include <sys/sysmacros.h> /* major() and minor() */
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11 | #include "unarchive.h"
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12 | #include "libbb.h"
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13 |
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14 | typedef struct hardlinks_s {
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15 | file_header_t *entry;
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16 | int inode;
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17 | struct hardlinks_s *next;
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18 | } hardlinks_t;
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19 |
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20 | char get_header_cpio(archive_handle_t *archive_handle)
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21 | {
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22 | static hardlinks_t *saved_hardlinks = NULL;
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23 | static unsigned short pending_hardlinks = 0;
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24 | file_header_t *file_header = archive_handle->file_header;
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25 | char cpio_header[110];
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26 | int namesize;
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27 | char dummy[16];
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28 | int major, minor, nlink, inode;
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29 |
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30 | if (pending_hardlinks) { /* Deal with any pending hardlinks */
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31 | hardlinks_t *tmp;
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32 | hardlinks_t *oldtmp;
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33 |
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34 | tmp = saved_hardlinks;
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35 | oldtmp = NULL;
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36 |
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37 | while (tmp) {
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38 | bb_error_msg_and_die("need to fix this\n");
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39 | if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
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40 | file_header = tmp->entry;
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41 | if (oldtmp) {
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42 | oldtmp->next = tmp->next; /* Remove item from linked list */
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43 | } else {
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44 | saved_hardlinks = tmp->next;
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45 | }
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46 | free(tmp);
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47 | continue;
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48 | }
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49 | oldtmp = tmp;
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50 | tmp = tmp->next;
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51 | }
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52 | pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
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53 | }
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54 |
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55 | /* There can be padding before archive header */
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56 | data_align(archive_handle, 4);
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57 |
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58 | if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
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59 | return(EXIT_FAILURE);
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60 | }
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61 | archive_handle->offset += 110;
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62 |
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63 | if ((strncmp(&cpio_header[0], "07070", 5) != 0) || ((cpio_header[5] != '1') && (cpio_header[5] != '2'))) {
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64 | bb_error_msg_and_die("Unsupported cpio format, use newc or crc");
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65 | }
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66 |
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67 | {
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68 | unsigned long tmpsize;
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69 | sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
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70 | dummy, &inode, (unsigned int*)&file_header->mode,
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71 | (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
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72 | &nlink, &file_header->mtime, &tmpsize,
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73 | dummy, &major, &minor, &namesize, dummy);
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74 | file_header->size = tmpsize;
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75 | }
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76 |
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77 | file_header->name = (char *) xzalloc(namesize + 1);
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78 | archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
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79 | archive_handle->offset += namesize;
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80 |
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81 | /* Update offset amount and skip padding before file contents */
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82 | data_align(archive_handle, 4);
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83 |
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84 | if (strcmp(file_header->name, "TRAILER!!!") == 0) {
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85 | printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
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86 | if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
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87 | hardlinks_t *tmp = saved_hardlinks;
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88 | hardlinks_t *oldtmp = NULL;
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89 | while (tmp) {
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90 | bb_error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
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91 | oldtmp = tmp;
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92 | tmp = tmp->next;
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93 | free (oldtmp->entry->name);
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94 | free (oldtmp->entry);
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95 | free (oldtmp);
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96 | }
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97 | saved_hardlinks = NULL;
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98 | pending_hardlinks = 0;
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99 | }
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100 | return(EXIT_FAILURE);
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101 | }
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102 |
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103 | if (S_ISLNK(file_header->mode)) {
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104 | file_header->link_name = (char *) xzalloc(file_header->size + 1);
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105 | archive_xread_all(archive_handle, file_header->link_name, file_header->size);
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106 | archive_handle->offset += file_header->size;
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107 | file_header->size = 0; /* Stop possible seeks in future */
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108 | } else {
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109 | file_header->link_name = NULL;
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110 | }
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111 | if (nlink > 1 && !S_ISDIR(file_header->mode)) {
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112 | if (file_header->size == 0) { /* Put file on a linked list for later */
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113 | hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
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114 | new->next = saved_hardlinks;
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115 | new->inode = inode;
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116 | new->entry = file_header;
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117 | saved_hardlinks = new;
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118 | return(EXIT_SUCCESS); // Skip this one
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119 | } else { /* Found the file with data in */
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120 | hardlinks_t *tmp = saved_hardlinks;
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121 | pending_hardlinks = 1;
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122 | while (tmp) {
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123 | if (tmp->inode == inode) {
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124 | tmp->entry->link_name = bb_xstrdup(file_header->name);
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125 | nlink--;
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126 | }
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127 | tmp = tmp->next;
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128 | }
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129 | if (nlink > 1) {
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130 | bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
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131 | }
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132 | }
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133 | }
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134 | file_header->device = makedev(major, minor);
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135 |
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136 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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137 | archive_handle->action_data(archive_handle);
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138 | archive_handle->action_header(archive_handle->file_header);
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139 | } else {
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140 | data_skip(archive_handle);
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141 | }
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142 |
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143 | archive_handle->offset += file_header->size;
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144 |
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145 | free(file_header->link_name);
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146 |
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147 | return (EXIT_SUCCESS);
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148 | }
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