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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdlib.h>
#include "private/ErrnoRestorer.h"
// The difference between inet_network(3) and inet_addr(3) is that
// inet_network uses host order and inet_addr network order.
in_addr_t inet_network(const char* cp) {
in_addr_t network_order = inet_addr(cp);
return ntohl(network_order);
}
in_addr_t inet_addr(const char* cp) {
in_addr addr;
return inet_aton(cp, &addr) ? addr.s_addr : INADDR_NONE;
}
int inet_aton(const char* cp, in_addr* addr) {
ErrnoRestorer errno_restorer;
unsigned long parts[4];
size_t i;
for (i = 0; i < 4; ++i) {
char* end;
errno = 0;
parts[i] = strtoul(cp, &end, 0);
if (errno != 0 || end == cp || (*end != '.' && *end != '\0')) return 0;
if (*end == '\0') break;
cp = end + 1;
}
uint32_t result = 0;
if (i == 0) {
// a (a 32-bit).
if (parts[0] > 0xffffffff) return 0;
result = parts[0];
} else if (i == 1) {
// a.b (b 24-bit).
if (parts[0] > 0xff || parts[1] > 0xffffff) return 0;
result = (parts[0] << 24) | parts[1];
} else if (i == 2) {
// a.b.c (c 16-bit).
if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xffff) return 0;
result = (parts[0] << 24) | (parts[1] << 16) | parts[2];
} else if (i == 3) {
// a.b.c.d (d 8-bit).
if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff || parts[3] > 0xff) return 0;
result = (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3];
} else {
return 0;
}
if (addr != nullptr) addr->s_addr = htonl(result);
return 1;
}
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