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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-04-17 23:20:35 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-04-17 23:31:32 +0200
commit1fe3f86230a970b3974f16a6bc2e819fdaf55b58 (patch)
tree7f9f097840a68e0e6605059c9ebb2f8ee2d3fbfd /lib/tar/pax_header.c
parent15250710c63a2c3d230304e46a03532f787759fb (diff)
Cleanup: split read_header.c in libtar.a
Simply moving the pax header decoding to a separate file and splitting out the common helper functions should be a good start. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/tar/pax_header.c')
-rw-r--r--lib/tar/pax_header.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/lib/tar/pax_header.c b/lib/tar/pax_header.c
new file mode 100644
index 0000000..4eeabf5
--- /dev/null
+++ b/lib/tar/pax_header.c
@@ -0,0 +1,183 @@
+/* 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(FILE *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.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;
+}