/* * Construct and return the list of xattr name:value pairs for the passed xattr * id * * There are two users for get_xattr(), Mksquashfs uses it to read the * xattrs from the filesystem on appending, and Unsquashfs uses it * to retrieve the xattrs for writing to disk. * * Unfortunately, the two users disagree on what to do with unknown * xattr prefixes, Mksquashfs wants to treat this as fatal otherwise * this will cause xattrs to be be lost on appending. Unsquashfs * on the otherhand wants to retrieve the xattrs which are known and * to ignore the rest, this allows Unsquashfs to cope more gracefully * with future versions which may have unknown xattrs, as long as the * general xattr structure is adhered to, Unsquashfs should be able * to safely ignore unknown xattrs, and to write the ones it knows about, * this is better than completely refusing to retrieve all the xattrs. * * If ignore is TRUE then don't treat unknown xattr prefixes as * a failure to read the xattr. */ struct xattr_list *get_xattr(int i, unsigned int *count, int ignore) { long long start; struct xattr_list *xattr_list = NULL; unsigned int offset; void *xptr; int j = 0, res = 1; TRACE("get_xattr\n"); *count = xattr_ids[i].count; start = SQUASHFS_XATTR_BLK(xattr_ids[i].xattr) + xattr_table_start; offset = SQUASHFS_XATTR_OFFSET(xattr_ids[i].xattr); xptr = xattrs + get_xattr_block(start) + offset; TRACE("get_xattr: xattr_id %d, count %d, start %lld, offset %d\n", i, *count, start, offset); while (j < *count) { struct squashfs_xattr_entry entry; struct squashfs_xattr_val val; if (res != 0) { xattr_list = realloc(xattr_list, (j + 1) * sizeof(struct xattr_list)); if (xattr_list == NULL) MEM_ERROR(); } SQUASHFS_SWAP_XATTR_ENTRY(xptr, &entry); xptr += sizeof(entry); res = read_xattr_entry(&xattr_list[j], &entry, xptr); if (ignore && res == 0) { /* unknown prefix, but ignore flag is set */ (*count)--; continue; } if (res != 1) goto failed; xptr += entry.size; TRACE("get_xattr: xattr %d, type %d, size %d, name %s\n", j, entry.type, entry.size, xattr_list[j].full_name); if (entry.type & SQUASHFS_XATTR_VALUE_OOL) { long long xattr; void *ool_xptr; xptr += sizeof(val); SQUASHFS_SWAP_LONG_LONGS(xptr, &xattr, 1); xptr += sizeof(xattr); start = SQUASHFS_XATTR_BLK(xattr) + xattr_table_start; offset = SQUASHFS_XATTR_OFFSET(xattr); ool_xptr = xattrs + get_xattr_block(start) + offset; SQUASHFS_SWAP_XATTR_VAL(ool_xptr, &val); xattr_list[j].value = ool_xptr + sizeof(val); } else { SQUASHFS_SWAP_XATTR_VAL(xptr, &val); xattr_list[j].value = xptr + sizeof(val); xptr += sizeof(val) + val.vsize; } TRACE("get_xattr: xattr %d, vsize %d\n", j, val.vsize); xattr_list[j++].vsize = val.vsize; } if (*count == 0) goto failed; return xattr_list; failed: free_xattr(xattr_list, j); return NULL; }
/* * Construct and return the list of xattr name:value pairs for the passed xattr * id */ struct xattr_list *get_xattr(int i, unsigned int *count) { long long start; struct xattr_list *xattr_list = NULL; unsigned int offset; void *xptr; int j; TRACE("get_xattr\n"); *count = xattr_ids[i].count; start = SQUASHFS_XATTR_BLK(xattr_ids[i].xattr) + xattr_table_start; offset = SQUASHFS_XATTR_OFFSET(xattr_ids[i].xattr); xptr = xattrs + get_xattr_block(start) + offset; TRACE("get_xattr: xattr_id %d, count %d, start %lld, offset %d\n", i, *count, start, offset); for(j = 0; j < *count; j++) { struct squashfs_xattr_entry entry; struct squashfs_xattr_val val; int res; xattr_list = realloc(xattr_list, (j + 1) * sizeof(struct xattr_list)); if(xattr_list == NULL) { ERROR("Out of memory in get_xattrs\n"); goto failed; } SQUASHFS_SWAP_XATTR_ENTRY(&entry, xptr); xptr += sizeof(entry); res = read_xattr_entry(&xattr_list[j], &entry, xptr); if(res != 1) goto failed; xptr += entry.size; TRACE("get_xattr: xattr %d, type %d, size %d, name %s\n", j, entry.type, entry.size, xattr_list[j].full_name); if(entry.type & SQUASHFS_XATTR_VALUE_OOL) { long long xattr; void *ool_xptr; xptr += sizeof(val); SQUASHFS_SWAP_LONG_LONGS(&xattr, xptr, 1); xptr += sizeof(xattr); start = SQUASHFS_XATTR_BLK(xattr) + xattr_table_start; offset = SQUASHFS_XATTR_OFFSET(xattr); ool_xptr = xattrs + get_xattr_block(start) + offset; SQUASHFS_SWAP_XATTR_VAL(&val, ool_xptr); xattr_list[j].value = ool_xptr + sizeof(val); } else { SQUASHFS_SWAP_XATTR_VAL(&val, xptr); xattr_list[j].value = xptr + sizeof(val); xptr += sizeof(val) + val.vsize; } TRACE("get_xattr: xattr %d, vsize %d\n", j, val.vsize); xattr_list[j].vsize = val.vsize; } return xattr_list; failed: free(xattr_list); return NULL; }