7b77cb35af
I wasn't checking for overflow. Luckily, I had a test that overflows on LP32. Change-Id: If2cf33d88f459eb26d0ce75f3c5ed192f516ab7a
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include "private/ErrnoRestorer.h"
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// The difference between inet_network(3) and inet_addr(3) is that
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// inet_network uses host order and inet_addr network order.
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in_addr_t inet_network(const char* cp) {
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in_addr_t network_order = inet_addr(cp);
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return ntohl(network_order);
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}
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in_addr_t inet_addr(const char* cp) {
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in_addr addr;
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return inet_aton(cp, &addr) ? addr.s_addr : INADDR_NONE;
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}
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int inet_aton(const char* cp, in_addr* addr) {
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ErrnoRestorer errno_restorer;
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unsigned long parts[4];
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size_t i;
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for (i = 0; i < 4; ++i) {
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char* end;
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errno = 0;
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parts[i] = strtoul(cp, &end, 0);
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if (errno != 0 || end == cp || (*end != '.' && *end != '\0')) return 0;
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if (*end == '\0') break;
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cp = end + 1;
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}
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uint32_t result = 0;
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if (i == 0) {
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// a (a 32-bit).
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if (parts[0] > 0xffffffff) return 0;
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result = parts[0];
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} else if (i == 1) {
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// a.b (b 24-bit).
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if (parts[0] > 0xff || parts[1] > 0xffffff) return 0;
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result = (parts[0] << 24) | parts[1];
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} else if (i == 2) {
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// a.b.c (c 16-bit).
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if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xffff) return 0;
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result = (parts[0] << 24) | (parts[1] << 16) | parts[2];
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} else if (i == 3) {
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// a.b.c.d (d 8-bit).
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if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff || parts[3] > 0xff) return 0;
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result = (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3];
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} else {
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return 0;
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}
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if (addr != nullptr) addr->s_addr = htonl(result);
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return 1;
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}
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