// Copyright (c) 2009 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "net/base/dns_util.h" #include <cstring> namespace net { // Based on DJB's public domain code. bool DNSDomainFromDot(const std::string& dotted, std::string* out) { const char* buf = dotted.data(); unsigned n = dotted.size(); char label[63]; unsigned int labellen = 0; /* <= sizeof label */ char name[255]; unsigned int namelen = 0; /* <= sizeof name */ char ch; for (;;) { if (!n) break; ch = *buf++; --n; if (ch == '.') { if (labellen) { if (namelen + labellen + 1 > sizeof name) return false; name[namelen++] = labellen; memcpy(name + namelen, label, labellen); namelen += labellen; labellen = 0; } continue; } if (labellen >= sizeof label) return false; label[labellen++] = ch; } if (labellen) { if (namelen + labellen + 1 > sizeof name) return false; name[namelen++] = labellen; memcpy(name + namelen, label, labellen); namelen += labellen; labellen = 0; } if (namelen + 1 > sizeof name) return false; name[namelen++] = 0; *out = name; return true; } bool IsSTD3ASCIIValidCharacter(char c) { if (c <= 0x2c) return false; if (c >= 0x7b) return false; if (c >= 0x2e && c <= 0x2f) return false; if (c >= 0x3a && c <= 0x40) return false; if (c >= 0x5b && c <= 0x60) return false; return true; } } // namespace net