/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <util.h> #include "bus-signature.h" #include "bus-type.h" static int signature_element_length_internal( const char *s, bool allow_dict_entry, unsigned array_depth, unsigned struct_depth, size_t *l) { int r; assert(s); if (bus_type_is_basic(*s) || *s == SD_BUS_TYPE_VARIANT) { *l = 1; return 0; } if (*s == SD_BUS_TYPE_ARRAY) { size_t t; if (array_depth >= 32) return -EINVAL; r = signature_element_length_internal(s + 1, true, array_depth+1, struct_depth, &t); if (r < 0) return r; *l = t + 1; return 0; } if (*s == SD_BUS_TYPE_STRUCT_BEGIN) { const char *p = s + 1; if (struct_depth >= 32) return -EINVAL; while (*p != SD_BUS_TYPE_STRUCT_END) { size_t t; r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t); if (r < 0) return r; p += t; } *l = p - s + 1; return 0; } if (*s == SD_BUS_TYPE_DICT_ENTRY_BEGIN && allow_dict_entry) { const char *p = s + 1; unsigned n = 0; if (struct_depth >= 32) return -EINVAL; while (*p != SD_BUS_TYPE_DICT_ENTRY_END) { size_t t; if (n == 0 && !bus_type_is_basic(*p)) return -EINVAL; r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t); if (r < 0) return r; p += t; n++; } if (n != 2) return -EINVAL; *l = p - s + 1; return 0; } return -EINVAL; } int signature_element_length(const char *s, size_t *l) { return signature_element_length_internal(s, true, 0, 0, l); } bool signature_is_single(const char *s, bool allow_dict_entry) { int r; size_t t; assert(s); r = signature_element_length_internal(s, allow_dict_entry, 0, 0, &t); if (r < 0) return false; return s[t] == 0; } bool signature_is_pair(const char *s) { assert(s); if (!bus_type_is_basic(*s)) return false; return signature_is_single(s + 1, false); } bool signature_is_valid(const char *s, bool allow_dict_entry) { const char *p; int r; assert(s); p = s; while (*p) { size_t t; r = signature_element_length_internal(p, allow_dict_entry, 0, 0, &t); if (r < 0) return false; p += t; } return p - s <= 255; }