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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "android-base/parsenetaddress.h"
     18 
     19 #include <algorithm>
     20 
     21 #include "android-base/stringprintf.h"
     22 #include "android-base/strings.h"
     23 
     24 namespace android {
     25 namespace base {
     26 
     27 bool ParseNetAddress(const std::string& address, std::string* host, int* port,
     28                      std::string* canonical_address, std::string* error) {
     29   host->clear();
     30 
     31   bool ipv6 = true;
     32   bool saw_port = false;
     33   size_t colons = std::count(address.begin(), address.end(), ':');
     34   size_t dots = std::count(address.begin(), address.end(), '.');
     35   std::string port_str;
     36   if (address[0] == '[') {
     37     // [::1]:123
     38     if (address.rfind("]:") == std::string::npos) {
     39       *error = StringPrintf("bad IPv6 address '%s'", address.c_str());
     40       return false;
     41     }
     42     *host = address.substr(1, (address.find("]:") - 1));
     43     port_str = address.substr(address.rfind("]:") + 2);
     44     saw_port = true;
     45   } else if (dots == 0 && colons >= 2 && colons <= 7) {
     46     // ::1
     47     *host = address;
     48   } else if (colons <= 1) {
     49     // 1.2.3.4 or some.accidental.domain.com
     50     ipv6 = false;
     51     std::vector<std::string> pieces = Split(address, ":");
     52     *host = pieces[0];
     53     if (pieces.size() > 1) {
     54       port_str = pieces[1];
     55       saw_port = true;
     56     }
     57   }
     58 
     59   if (host->empty()) {
     60     *error = StringPrintf("no host in '%s'", address.c_str());
     61     return false;
     62   }
     63 
     64   if (saw_port) {
     65     if (sscanf(port_str.c_str(), "%d", port) != 1 || *port <= 0 ||
     66         *port > 65535) {
     67       *error = StringPrintf("bad port number '%s' in '%s'", port_str.c_str(),
     68                             address.c_str());
     69       return false;
     70     }
     71   }
     72 
     73   if (canonical_address != nullptr) {
     74     *canonical_address =
     75         StringPrintf(ipv6 ? "[%s]:%d" : "%s:%d", host->c_str(), *port);
     76   }
     77 
     78   return true;
     79 }
     80 
     81 }  // namespace base
     82 }  // namespace android
     83