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d7797c8bf8
The POSIX man-page states that inet_pton returns 0 if the input is not a valid IPv4 dotted-decimal string or a valid IPv6 address string. This is also how it is implemented in SerenityOS. This means that we should treat a return value of 0 as an error to avoid using an invalid address (or 0.0.0.0).
76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <stdio.h>
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extern "C" {
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const char* inet_ntop(int af, const void* src, char* dst, socklen_t len)
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{
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if (af != AF_INET) {
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errno = EAFNOSUPPORT;
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return nullptr;
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}
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if (len < 4) {
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errno = ENOSPC;
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return nullptr;
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}
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auto* bytes = (const unsigned char*)src;
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snprintf(dst, len, "%u.%u.%u.%u", bytes[0], bytes[1], bytes[2], bytes[3]);
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return (const char*)dst;
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}
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int inet_pton(int af, const char* src, void* dst)
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{
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if (af != AF_INET) {
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errno = EAFNOSUPPORT;
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return -1;
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}
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unsigned a;
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unsigned b;
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unsigned c;
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unsigned d;
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int count = sscanf(src, "%u.%u.%u.%u", &a, &b, &c, &d);
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if (count != 4) {
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errno = EINVAL;
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return 0;
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}
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union {
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struct {
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uint8_t a;
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uint8_t b;
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uint8_t c;
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uint8_t d;
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};
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uint32_t l;
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} u;
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u.a = a;
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u.b = b;
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u.c = c;
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u.d = d;
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*(uint32_t*)dst = u.l;
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return 1;
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}
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in_addr_t inet_addr(const char* str)
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{
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in_addr_t tmp {};
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int rc = inet_pton(AF_INET, str, &tmp);
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if (rc <= 0)
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return INADDR_NONE;
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return tmp;
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}
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char* inet_ntoa(struct in_addr in)
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{
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static char buffer[32];
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inet_ntop(AF_INET, &in.s_addr, buffer, sizeof(buffer));
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return buffer;
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}
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}
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