318 lines
8.5 KiB
C
318 lines
8.5 KiB
C
/* tar.c - Alpine Package Keeper (APK)
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*
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* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
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* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include "apk_defines.h"
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#include "apk_tar.h"
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struct tar_header {
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/* ustar header, Posix 1003.1 */
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char name[100]; /* 0-99 */
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char mode[8]; /* 100-107 */
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char uid[8]; /* 108-115 */
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char gid[8]; /* 116-123 */
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char size[12]; /* 124-135 */
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char mtime[12]; /* 136-147 */
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char chksum[8]; /* 148-155 */
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char typeflag; /* 156-156 */
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char linkname[100]; /* 157-256 */
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char magic[8]; /* 257-264 */
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char uname[32]; /* 265-296 */
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char gname[32]; /* 297-328 */
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char devmajor[8]; /* 329-336 */
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char devminor[8]; /* 337-344 */
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char prefix[155]; /* 345-499 */
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char padding[12]; /* 500-511 */
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};
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#define TAR_BLOB(s) APK_BLOB_PTR_LEN(s, strnlen(s, sizeof(s)))
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#define GET_OCTAL(s) get_octal(s, sizeof(s))
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#define PUT_OCTAL(s,v) put_octal(s, sizeof(s), v)
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static unsigned int get_octal(char *s, size_t l)
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{
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apk_blob_t b = APK_BLOB_PTR_LEN(s, l);
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return apk_blob_pull_uint(&b, 8);
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}
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static void put_octal(char *s, size_t l, size_t value)
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{
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char *ptr = &s[l - 1];
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*(ptr--) = '\0';
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while (value != 0 && ptr >= s) {
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*(ptr--) = '0' + (value % 8);
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value /= 8;
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}
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while (ptr >= s)
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*(ptr--) = '0';
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}
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static int blob_realloc(apk_blob_t *b, size_t newsize)
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{
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char *tmp;
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if (b->len >= newsize) return 0;
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tmp = realloc(b->ptr, newsize);
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if (!tmp) return -ENOMEM;
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b->ptr = tmp;
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b->len = newsize;
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return 0;
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}
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static void handle_extended_header(struct apk_file_info *fi, apk_blob_t hdr)
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{
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apk_blob_t name, value;
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while (1) {
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char *start = hdr.ptr;
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unsigned int len = apk_blob_pull_uint(&hdr, 10);
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apk_blob_pull_char(&hdr, ' ');
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if (!apk_blob_split(hdr, APK_BLOB_STR("="), &name, &hdr)) break;
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if (len < hdr.ptr - start + 1) break;
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len -= hdr.ptr - start + 1;
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if (hdr.len < len) break;
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value = APK_BLOB_PTR_LEN(hdr.ptr, len);
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hdr = APK_BLOB_PTR_LEN(hdr.ptr+len, hdr.len-len);
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apk_blob_pull_char(&hdr, '\n');
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if (APK_BLOB_IS_NULL(hdr)) break;
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value.ptr[value.len] = 0;
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if (apk_blob_compare(name, APK_BLOB_STR("path")) == 0) {
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fi->name = value.ptr;
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} else if (apk_blob_compare(name, APK_BLOB_STR("linkpath")) == 0) {
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fi->link_target = value.ptr;
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} else if (apk_blob_pull_blob_match(&name, APK_BLOB_STR("SCHILY.xattr."))) {
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name.ptr[name.len] = 0;
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*apk_xattr_array_add(&fi->xattrs) = (struct apk_xattr) {
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.name = name.ptr,
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.value = value,
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};
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} else if (apk_blob_pull_blob_match(&name, APK_BLOB_STR("APK-TOOLS.checksum."))) {
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int alg = APK_DIGEST_NONE;
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if (apk_blob_compare(name, APK_BLOB_STR("SHA1")) == 0)
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alg = APK_DIGEST_SHA1;
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else if (apk_blob_compare(name, APK_BLOB_STR("MD5")) == 0)
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alg = APK_DIGEST_MD5;
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if (alg > fi->digest.alg) {
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apk_digest_set(&fi->digest, alg);
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apk_blob_pull_hexdump(&value, APK_DIGEST_BLOB(fi->digest));
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if (APK_BLOB_IS_NULL(value)) apk_digest_reset(&fi->digest);
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}
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}
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}
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}
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int apk_tar_parse(struct apk_istream *is, apk_archive_entry_parser parser,
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void *ctx, struct apk_id_cache *idc)
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{
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struct apk_file_info entry;
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struct apk_segment_istream segment;
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struct tar_header buf;
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int end = 0, r;
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size_t toskip, paxlen = 0;
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apk_blob_t pax = APK_BLOB_NULL, longname = APK_BLOB_NULL;
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char filename[sizeof buf.name + sizeof buf.prefix + 2];
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if (IS_ERR_OR_NULL(is)) return PTR_ERR(is) ?: -EINVAL;
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memset(&entry, 0, sizeof(entry));
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entry.name = buf.name;
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while ((r = apk_istream_read_max(is, &buf, 512)) == 512) {
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if (buf.name[0] == '\0') {
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if (end) break;
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end++;
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continue;
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}
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entry = (struct apk_file_info){
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.size = GET_OCTAL(buf.size),
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.uid = apk_id_cache_resolve_uid(idc, TAR_BLOB(buf.uname), GET_OCTAL(buf.uid)),
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.gid = apk_id_cache_resolve_gid(idc, TAR_BLOB(buf.gname), GET_OCTAL(buf.gid)),
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.mode = GET_OCTAL(buf.mode) & 07777,
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.mtime = GET_OCTAL(buf.mtime),
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.name = entry.name,
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.uname = buf.uname,
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.gname = buf.gname,
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.device = makedev(GET_OCTAL(buf.devmajor),
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GET_OCTAL(buf.devminor)),
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.xattrs = entry.xattrs,
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};
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if (buf.prefix[0] && buf.typeflag != 'x' && buf.typeflag != 'g') {
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snprintf(filename, sizeof filename, "%.*s/%.*s",
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(int) sizeof buf.prefix, buf.prefix,
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(int) sizeof buf.name, buf.name);
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entry.name = filename;
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}
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buf.mode[0] = 0; /* to nul terminate 100-byte buf.name */
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buf.magic[0] = 0; /* to nul terminate 100-byte buf.linkname */
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apk_xattr_array_resize(&entry.xattrs, 0);
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if (entry.size >= SSIZE_MAX-512) goto err;
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if (paxlen) {
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handle_extended_header(&entry, APK_BLOB_PTR_LEN(pax.ptr, paxlen));
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apk_fileinfo_hash_xattr(&entry, APK_DIGEST_SHA1);
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}
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toskip = (entry.size + 511) & -512;
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switch (buf.typeflag) {
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case 'L': /* GNU long name extension */
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if ((r = blob_realloc(&longname, entry.size+1)) != 0 ||
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(r = apk_istream_read(is, longname.ptr, entry.size)) < 0)
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goto err;
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longname.ptr[entry.size] = 0;
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entry.name = longname.ptr;
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toskip -= entry.size;
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break;
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case 'K': /* GNU long link target extension - ignored */
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break;
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case '0':
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case '7': /* regular file */
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entry.mode |= S_IFREG;
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break;
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case '1': /* hard link */
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entry.mode |= S_IFREG;
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if (!entry.link_target) entry.link_target = buf.linkname;
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break;
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case '2': /* symbolic link */
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entry.mode |= S_IFLNK;
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if (!entry.link_target) entry.link_target = buf.linkname;
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break;
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case '3': /* char device */
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entry.mode |= S_IFCHR;
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break;
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case '4': /* block device */
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entry.mode |= S_IFBLK;
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break;
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case '5': /* directory */
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entry.mode |= S_IFDIR;
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break;
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case '6': /* fifo */
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entry.mode |= S_IFIFO;
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break;
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case 'g': /* global pax header */
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break;
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case 'x': /* file specific pax header */
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paxlen = entry.size;
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if ((r = blob_realloc(&pax, (paxlen + 511) & -512)) != 0 ||
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(r = apk_istream_read(is, pax.ptr, paxlen)) < 0)
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goto err;
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toskip -= entry.size;
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break;
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default:
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break;
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}
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if (strnlen(entry.name, PATH_MAX) >= PATH_MAX-10 ||
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(entry.link_target && strnlen(entry.link_target, PATH_MAX) >= PATH_MAX-10)) {
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r = -ENAMETOOLONG;
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goto err;
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}
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if (entry.mode & S_IFMT) {
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apk_istream_segment(&segment, is, entry.size, entry.mtime);
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r = parser(ctx, &entry, &segment.is);
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if (r != 0) goto err;
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apk_istream_close(&segment.is);
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entry.name = buf.name;
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toskip -= entry.size;
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paxlen = 0;
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}
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if (toskip && (r = apk_istream_read(is, NULL, toskip)) < 0)
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goto err;
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}
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/* Read remaining end-of-archive records, to ensure we read all of
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* the file. The underlying istream is likely doing checksumming. */
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if (r == 512) {
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while ((r = apk_istream_read_max(is, &buf, 512)) == 512) {
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if (buf.name[0] != 0) break;
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}
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}
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if (r == 0) goto ok;
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err:
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/* Check that there was no partial (or non-zero) record */
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if (r >= 0) r = -APKE_EOF;
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ok:
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free(pax.ptr);
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free(longname.ptr);
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apk_fileinfo_free(&entry);
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return apk_istream_close_error(is, r);
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}
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int apk_tar_write_entry(struct apk_ostream *os, const struct apk_file_info *ae,
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const char *data)
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{
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struct tar_header buf;
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memset(&buf, 0, sizeof(buf));
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if (ae != NULL) {
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const unsigned char *src;
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int chksum, i;
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if (S_ISREG(ae->mode))
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buf.typeflag = '0';
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else
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return -1;
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if (ae->name != NULL)
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strlcpy(buf.name, ae->name, sizeof buf.name);
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strlcpy(buf.uname, ae->uname ?: "root", sizeof buf.uname);
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strlcpy(buf.gname, ae->gname ?: "root", sizeof buf.gname);
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PUT_OCTAL(buf.size, ae->size);
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PUT_OCTAL(buf.uid, ae->uid);
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PUT_OCTAL(buf.gid, ae->gid);
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PUT_OCTAL(buf.mode, ae->mode & 07777);
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PUT_OCTAL(buf.mtime, ae->mtime ?: apk_get_build_time());
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/* Checksum */
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strcpy(buf.magic, "ustar ");
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memset(buf.chksum, ' ', sizeof(buf.chksum));
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src = (const unsigned char *) &buf;
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for (i = chksum = 0; i < sizeof(buf); i++)
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chksum += src[i];
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put_octal(buf.chksum, sizeof(buf.chksum)-1, chksum);
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}
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if (apk_ostream_write(os, &buf, sizeof(buf)) < 0)
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return -1;
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if (ae == NULL) {
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/* End-of-archive is two empty headers */
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if (apk_ostream_write(os, &buf, sizeof(buf)) < 0)
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return -1;
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} else if (data != NULL) {
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if (apk_ostream_write(os, data, ae->size) < 0)
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return -1;
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if (apk_tar_write_padding(os, ae) != 0)
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return -1;
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}
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return 0;
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}
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int apk_tar_write_padding(struct apk_ostream *os, const struct apk_file_info *ae)
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{
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static char padding[512];
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int pad;
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pad = 512 - (ae->size & 511);
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if (pad != 512 &&
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apk_ostream_write(os, padding, pad) < 0)
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return -1;
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return 0;
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}
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