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/* extract_v3.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include <sys/stat.h>
#include "apk_context.h"
#include "apk_extract.h"
#include "apk_adb.h"
#include "apk_pathbuilder.h"
struct apk_extract_v3_ctx {
struct apk_extract_ctx *ectx;
struct adb db;
struct adb_obj pkg, paths, path, files, file;
unsigned int cur_path, cur_file;
struct apk_pathbuilder pb;
};
static const char *uvol_detect(struct apk_ctx *ac, const char *path)
{
if (!apk_ctx_get_uvol(ac)) return 0;
if (strncmp(path, "uvol", 4) != 0) return 0;
if (path[4] == 0) return path;
if (path[4] == '/') return &path[5];
return 0;
}
static void apk_extract_v3_acl(struct apk_file_info *fi, struct adb_obj *o, struct apk_id_cache *idc)
{
fi->mode = adb_ro_int(o, ADBI_ACL_MODE);
fi->uid = apk_id_cache_resolve_uid(idc, adb_ro_blob(o, ADBI_ACL_USER), 65534);
fi->gid = apk_id_cache_resolve_gid(idc, adb_ro_blob(o, ADBI_ACL_GROUP), 65534);
}
static int apk_extract_v3_file(struct apk_extract_ctx *ectx, off_t sz, struct apk_istream *is)
{
struct apk_extract_v3_ctx *ctx = ectx->pctx;
struct apk_ctx *ac = ectx->ac;
const char *path_name = apk_pathbuilder_cstr(&ctx->pb);
struct apk_file_info fi = {
.name = path_name,
.uvol_name = uvol_detect(ac, path_name),
.size = adb_ro_int(&ctx->file, ADBI_FI_SIZE),
.mtime = adb_ro_int(&ctx->file, ADBI_FI_MTIME),
};
struct adb_obj acl;
struct apk_digest_istream dis;
apk_blob_t target;
int r;
apk_extract_v3_acl(&fi, adb_ro_obj(&ctx->file, ADBI_FI_ACL, &acl), apk_ctx_get_id_cache(ectx->ac));
target = adb_ro_blob(&ctx->file, ADBI_FI_TARGET);
if (!APK_BLOB_IS_NULL(target)) {
char *target_path;
uint16_t mode;
if (target.len < 2) return -APKE_ADB_SCHEMA;
mode = *(uint16_t*)target.ptr;
target.ptr += 2;
target.len -= 2;
switch (mode) {
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
if (target.len != sizeof(uint64_t)) return -APKE_ADB_SCHEMA;
struct unaligned64 {
uint64_t value;
} __attribute__((packed));
fi.device = ((struct unaligned64 *)target.ptr)->value;
break;
case S_IFLNK:
target_path = alloca(target.len + 1);
memcpy(target_path, target.ptr, target.len);
target_path[target.len] = 0;
fi.link_target = target_path;
break;
default:
return -APKE_ADB_SCHEMA;
}
fi.mode |= mode;
return ectx->ops->file(ectx, &fi, is);
}
apk_digest_from_blob(&fi.digest, adb_ro_blob(&ctx->file, ADBI_FI_HASHES));
if (fi.digest.alg == APK_DIGEST_NONE) return -APKE_ADB_SCHEMA;
fi.mode |= S_IFREG;
r = ectx->ops->file(ectx, &fi, apk_istream_verify(&dis, is, &fi.digest));
return apk_istream_close_error(&dis.is, r);
}
static int apk_extract_v3_directory(struct apk_extract_ctx *ectx)
{
struct apk_extract_v3_ctx *ctx = ectx->pctx;
struct apk_ctx *ac = ectx->ac;
struct apk_file_info fi = {
.name = apk_pathbuilder_cstr(&ctx->pb),
};
struct adb_obj acl;
if (uvol_detect(ac, fi.name)) return 0;
apk_extract_v3_acl(&fi, adb_ro_obj(&ctx->path, ADBI_DI_ACL, &acl), apk_ctx_get_id_cache(ectx->ac));
fi.mode |= S_IFDIR;
return ectx->ops->file(ectx, &fi, 0);
}
static int apk_extract_v3_next_file(struct apk_extract_ctx *ectx)
{
struct apk_extract_v3_ctx *ctx = ectx->pctx;
apk_blob_t target;
int r;
if (!ctx->cur_path) {
r = ectx->ops->v3meta(ectx, &ctx->db);
if (r < 0) return r;
// one time init
ctx->cur_path = ADBI_FIRST;
ctx->cur_file = 0;
adb_r_rootobj(&ctx->db, &ctx->pkg, &schema_package);
adb_ro_obj(&ctx->pkg, ADBI_PKG_PATHS, &ctx->paths);
adb_ro_obj(&ctx->paths, ctx->cur_path, &ctx->path);
adb_ro_obj(&ctx->path, ADBI_DI_FILES, &ctx->files);
if (!ectx->ops->file) return -ECANCELED;
}
do {
ctx->cur_file++;
while (ctx->cur_file > adb_ra_num(&ctx->files)) {
ctx->cur_path++;
ctx->cur_file = ADBI_FIRST;
if (ctx->cur_path > adb_ra_num(&ctx->paths)) return 1;
adb_ro_obj(&ctx->paths, ctx->cur_path, &ctx->path);
apk_pathbuilder_setb(&ctx->pb, adb_ro_blob(&ctx->path, ADBI_DI_NAME));
adb_ro_obj(&ctx->path, ADBI_DI_FILES, &ctx->files);
r = apk_extract_v3_directory(ectx);
if (r != 0) return r;
}
adb_ro_obj(&ctx->files, ctx->cur_file, &ctx->file);
apk_pathbuilder_setb(&ctx->pb, adb_ro_blob(&ctx->path, ADBI_DI_NAME));
apk_pathbuilder_pushb(&ctx->pb, adb_ro_blob(&ctx->file, ADBI_FI_NAME));
target = adb_ro_blob(&ctx->file, ADBI_FI_TARGET);
if (adb_ro_int(&ctx->file, ADBI_FI_SIZE) != 0 &&
APK_BLOB_IS_NULL(target)) {
return 0;
}
r = apk_extract_v3_file(ectx, 0, 0);
if (r != 0) return r;
} while (1);
}
static int apk_extract_v3_data_block(struct adb *db, struct adb_block *b, struct apk_istream *is)
{
struct apk_extract_v3_ctx *ctx = container_of(db, struct apk_extract_v3_ctx, db);
struct apk_extract_ctx *ectx = ctx->ectx;
struct adb_data_package *hdr;
size_t sz = adb_block_length(b);
int r;
if (adb_block_type(b) != ADB_BLOCK_DATA) return 0;
r = apk_extract_v3_next_file(ectx);
if (r != 0) {
if (r > 0) r = -APKE_ADB_BLOCK;
return r;
}
hdr = apk_istream_get(is, sizeof *hdr);
sz -= sizeof *hdr;
if (IS_ERR(hdr)) return PTR_ERR(hdr);
if (hdr->path_idx != ctx->cur_path ||
hdr->file_idx != ctx->cur_file ||
sz != adb_ro_int(&ctx->file, ADBI_FI_SIZE)) {
// got data for some unexpected file
return -APKE_ADB_BLOCK;
}
return apk_extract_v3_file(ectx, sz, is);
}
int apk_extract_v3(struct apk_extract_ctx *ectx, struct apk_istream *is)
{
struct apk_ctx *ac = ectx->ac;
struct apk_trust *trust = apk_ctx_get_trust(ac);
struct apk_extract_v3_ctx ctx = {
.ectx = ectx,
};
int r;
if (IS_ERR(is)) return PTR_ERR(is);
if (!ectx->ops || !ectx->ops->v3meta)
return apk_istream_close_error(is, -APKE_FORMAT_NOT_SUPPORTED);
ectx->pctx = &ctx;
r = adb_m_process(&ctx.db, adb_decompress(is, 0),
ADB_SCHEMA_PACKAGE, trust, apk_extract_v3_data_block);
if (r == 0) {
r = apk_extract_v3_next_file(ectx);
if (r == 0) r = -APKE_ADB_BLOCK;
if (r == 1) r = 0;
}
if (r == -ECANCELED) r = 0;
adb_free(&ctx.db);
ectx->pctx = 0;
return r;
}
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