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LibC: Add IPv6 support to inet_ntop and inet_pton

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Tom 2022-02-18 21:48:06 -07:00 committed by Linus Groh
parent 2f0e3da142
commit d124889698
Notes: sideshowbarker 2024-07-17 17:43:05 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/d124889698
Pull-request: https://github.com/SerenityOS/serenity/pull/12645
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/linusg
1 changed files with 57 additions and 37 deletions
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94
Userland/Libraries/LibC/arpa/inet.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/IPv6Address.h>
#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
@ -13,49 +14,68 @@ extern "C" {
const char* inet_ntop(int af, const void* src, char* dst, socklen_t len)
{
if (af != AF_INET) {
errno = EAFNOSUPPORT;
return nullptr;
if (af == AF_INET) {
if (len < INET_ADDRSTRLEN) {
errno = ENOSPC;
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;
} else if (af == AF_INET6) {
if (len < INET6_ADDRSTRLEN) {
errno = ENOSPC;
return nullptr;
}
auto str = IPv6Address(((in6_addr const*)src)->s6_addr).to_string();
if (!str.copy_characters_to_buffer(dst, len)) {
errno = ENOSPC;
return nullptr;
}
return (const char*)dst;
}
if (len < 4) {
errno = ENOSPC;
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;
errno = EAFNOSUPPORT;
return nullptr;
}
int inet_pton(int af, const char* src, void* dst)
{
if (af != AF_INET) {
errno = EAFNOSUPPORT;
return -1;
if (af == AF_INET) {
unsigned a, b, c, 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;
} else if (af == AF_INET6) {
auto addr = IPv6Address::from_string(src);
if (!addr.has_value()) {
errno = EINVAL;
return 0;
}
memcpy(dst, addr->to_in6_addr_t(), sizeof(in6_addr));
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;
errno = EAFNOSUPPORT;
return -1;
}
in_addr_t inet_addr(const char* str)