[821] | 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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