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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <arpa/inet.h>
28#include <errno.h>
29#include <netinet/in.h>
30#include <stdio.h>
31
32extern "C" {
33
34const char* inet_ntop(int af, const void* src, char* dst, socklen_t len)
35{
36 if (af != AF_INET) {
37 errno = EAFNOSUPPORT;
38 return nullptr;
39 }
40 auto* bytes = (const unsigned char*)src;
41 snprintf(dst, len, "%u.%u.%u.%u", bytes[0], bytes[1], bytes[2], bytes[3]);
42 return (const char*)dst;
43}
44
45int inet_pton(int af, const char* src, void* dst)
46{
47 if (af != AF_INET) {
48 errno = EAFNOSUPPORT;
49 return -1;
50 }
51 unsigned a;
52 unsigned b;
53 unsigned c;
54 unsigned d;
55 int count = sscanf(src, "%u.%u.%u.%u", &a, &b, &c, &d);
56 if (count != 4) {
57 errno = EINVAL;
58 return 0;
59 }
60 union {
61 struct {
62 uint8_t a;
63 uint8_t b;
64 uint8_t c;
65 uint8_t d;
66 };
67 uint32_t l;
68 } u;
69 u.a = a;
70 u.b = b;
71 u.c = c;
72 u.d = d;
73 *(uint32_t*)dst = u.l;
74 return 1;
75}
76
77in_addr_t inet_addr(const char* str)
78{
79 in_addr_t tmp;
80 int rc = inet_pton(AF_INET, str, &tmp);
81 if (rc < 0)
82 return INADDR_NONE;
83 return tmp;
84}
85
86char* inet_ntoa(struct in_addr in)
87{
88 static char buffer[32];
89 inet_ntop(AF_INET, &in.s_addr, buffer, sizeof(buffer));
90 return buffer;
91}
92}