[2725] | 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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[3232] | 8 | #include "bb_archive.h"
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[2725] | 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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[3621] | 40 | if (!is_prefixed_with(&cpio_header[0], "07070")
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[2725] | 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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[3621] | 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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[2725] | 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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[3621] | 83 | if (strcmp(file_header->name, cpio_TRAILER) == 0) {
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[2725] | 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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