ladybird/Userland/Libraries/LibC/arpa/inet.cpp

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
#include <stdio.h>

extern "C" {

const char* inet_ntop(int af, const void* src, char* dst, socklen_t len)
{
    if (af != AF_INET) {
        errno = EAFNOSUPPORT;
        return nullptr;
    }
    auto* bytes = (const unsigned char*)src;
    snprintf(dst, len, "%u.%u.%u.%u", bytes[0], bytes[1], bytes[2], bytes[3]);
    return (const char*)dst;
}

int inet_pton(int af, const char* src, void* dst)
{
    if (af != AF_INET) {
        errno = EAFNOSUPPORT;
        return -1;
    }
    unsigned a;
    unsigned b;
    unsigned c;
    unsigned d;
    int count = sscanf(src, "%u.%u.%u.%u", &a, &b, &c, &d);
    if (count != 4) {
        errno = EINVAL;
        return 0;
    }
    union {
        struct {
            uint8_t a;
            uint8_t b;
            uint8_t c;
            uint8_t d;
        };
        uint32_t l;
    } u;
    u.a = a;
    u.b = b;
    u.c = c;
    u.d = d;
    *(uint32_t*)dst = u.l;
    return 1;
}

in_addr_t inet_addr(const char* str)
{
    in_addr_t tmp {};
    int rc = inet_pton(AF_INET, str, &tmp);
    if (rc < 0)
        return INADDR_NONE;
    return tmp;
}

char* inet_ntoa(struct in_addr in)
{
    static char buffer[32];
    inet_ntop(AF_INET, &in.s_addr, buffer, sizeof(buffer));
    return buffer;
}
}