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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* pax_header.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "internal.h"
static tar_xattr_t *mkxattr(const char *key, size_t keylen,
const char *value, size_t valuelen)
{
tar_xattr_t *xattr;
xattr = calloc(1, sizeof(*xattr) + keylen + 1 + valuelen + 1);
if (xattr == NULL)
return NULL;
xattr->key = xattr->data;
xattr->value = (sqfs_u8 *)xattr->data + keylen + 1;
xattr->value_len = valuelen;
memcpy(xattr->key, key, keylen);
memcpy(xattr->value, value, valuelen);
return xattr;
}
int read_pax_header(istream_t *fp, sqfs_u64 entsize, unsigned int *set_by_pax,
tar_header_decoded_t *out)
{
char *buffer, *line, *key, *ptr, *value, *end;
sparse_map_t *sparse_last = NULL, *sparse;
sqfs_u64 field, offset = 0, num_bytes = 0;
tar_xattr_t *xattr;
long len;
buffer = record_to_memory(fp, entsize);
if (buffer == NULL)
return -1;
end = buffer + entsize;
for (line = buffer; line < end; line += len) {
len = strtol(line, &ptr, 10);
if (ptr == line || !isspace(*ptr) || len <= 0)
goto fail_malformed;
if (len > (end - line))
goto fail_ov;
line[len - 1] = '\0';
while (ptr < end && isspace(*ptr))
++ptr;
if (ptr >= end || (ptr - line) >= len)
goto fail_malformed;
if (!strncmp(ptr, "uid=", 4)) {
if (pax_read_decimal(ptr + 4, &field))
goto fail;
out->sb.st_uid = field;
*set_by_pax |= PAX_UID;
} else if (!strncmp(ptr, "gid=", 4)) {
if (pax_read_decimal(ptr + 4, &field))
goto fail;
out->sb.st_gid = field;
*set_by_pax |= PAX_GID;
} else if (!strncmp(ptr, "path=", 5)) {
free(out->name);
out->name = strdup(ptr + 5);
if (out->name == NULL)
goto fail_errno;
*set_by_pax |= PAX_NAME;
} else if (!strncmp(ptr, "size=", 5)) {
if (pax_read_decimal(ptr + 5, &out->record_size))
goto fail;
*set_by_pax |= PAX_SIZE;
} else if (!strncmp(ptr, "linkpath=", 9)) {
free(out->link_target);
out->link_target = strdup(ptr + 9);
if (out->link_target == NULL)
goto fail_errno;
*set_by_pax |= PAX_SLINK_TARGET;
} else if (!strncmp(ptr, "mtime=", 6)) {
if (ptr[6] == '-') {
if (pax_read_decimal(ptr + 7, &field))
goto fail;
out->mtime = -((sqfs_s64)field);
} else {
if (pax_read_decimal(ptr + 6, &field))
goto fail;
out->mtime = field;
}
*set_by_pax |= PAX_MTIME;
} else if (!strncmp(ptr, "GNU.sparse.name=", 16)) {
free(out->name);
out->name = strdup(ptr + 16);
if (out->name == NULL)
goto fail_errno;
*set_by_pax |= PAX_NAME;
} else if (!strncmp(ptr, "GNU.sparse.map=", 15)) {
free_sparse_list(out->sparse);
sparse_last = NULL;
out->sparse = read_sparse_map(ptr + 15);
if (out->sparse == NULL)
goto fail;
} else if (!strncmp(ptr, "GNU.sparse.size=", 16)) {
if (pax_read_decimal(ptr + 16, &out->actual_size))
goto fail;
*set_by_pax |= PAX_SPARSE_SIZE;
} else if (!strncmp(ptr, "GNU.sparse.realsize=", 20)) {
if (pax_read_decimal(ptr + 20, &out->actual_size))
goto fail;
*set_by_pax |= PAX_SPARSE_SIZE;
} else if (!strncmp(ptr, "GNU.sparse.major=", 17) ||
!strncmp(ptr, "GNU.sparse.minor=", 17)) {
*set_by_pax |= PAX_SPARSE_GNU_1_X;
} else if (!strncmp(ptr, "GNU.sparse.offset=", 18)) {
if (pax_read_decimal(ptr + 18, &offset))
goto fail;
} else if (!strncmp(ptr, "GNU.sparse.numbytes=", 20)) {
if (pax_read_decimal(ptr + 20, &num_bytes))
goto fail;
sparse = calloc(1, sizeof(*sparse));
if (sparse == NULL)
goto fail_errno;
sparse->offset = offset;
sparse->count = num_bytes;
if (sparse_last == NULL) {
free_sparse_list(out->sparse);
out->sparse = sparse_last = sparse;
} else {
sparse_last->next = sparse;
sparse_last = sparse;
}
} else if (!strncmp(ptr, "SCHILY.xattr.", 13)) {
key = ptr + 13;
ptr = strrchr(key, '=');
if (ptr == NULL || ptr == key)
continue;
value = ptr + 1;
xattr = mkxattr(key, ptr - key,
value, len - (value - line) - 1);
if (xattr == NULL)
goto fail_errno;
xattr->next = out->xattr;
out->xattr = xattr;
} else if (!strncmp(ptr, "LIBARCHIVE.xattr.", 17)) {
key = ptr + 17;
ptr = strrchr(key, '=');
if (ptr == NULL || ptr == key)
continue;
value = ptr + 1;
xattr = mkxattr(key, ptr - key, value, strlen(value));
if (xattr == NULL)
goto fail_errno;
urldecode(xattr->key);
xattr->value_len = base64_decode(xattr->value, value,
xattr->value_len);
xattr->next = out->xattr;
out->xattr = xattr;
}
}
free(buffer);
return 0;
fail_malformed:
fputs("Found a malformed PAX header.\n", stderr);
goto fail;
fail_ov:
fputs("Numeric overflow in PAX header.\n", stderr);
goto fail;
fail_errno:
perror("reading pax header");
goto fail;
fail:
free(buffer);
return -1;
}
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