man inet_pton

라퀴옹 2016. 10. 18. 14:34

2016. 10. 18. 14:34

man inet_pton

날짜가 2008년도 ㄷㄷㄷ

요즘은 자동 번역기 덕분에 약간? 도움이 된다. 아 예제 볼려고 카피 했는데 ...

INET_PTON(3) Linux Programmer's Manual INET_PTON(3)

리눅스 프로그래머의 사용법

NAME

이름

inet_pton - convert IPv4 and IPv6 addresses from text to binary form

- IPv4 와 IPv6 주소들을 텍스트에서 바이너리 형태-폼?으로 변경한다.

SYNOPSIS

개요 - 뭐 이렇게 쓴다는 걸 알려줌. 아래 설명 잘 나옴...

#include <arpa/inet.h> //

int inet_pton(int af, const char *src, void *dst);

DESCRIPTION

설명

This function converts the character string src into a network address structure in the af address family,

then copies the network address structure to dst. The af argument must be either AF_INET or AF_INET6.

이 펑션은 문자열 src를 af 주소 집단의 네트워크 주소 구조체로 변경하고, 그 네트워크 주소 구조체를 dst에 복사한다. 그 af 함수 인자는 반드시 AF_INET 혹은 AF_INET6 중 하나이어야만 한다.

The following address families are currently supported:

아래의 주소 집단들이 현재 지원되고 있다: 2008년도인데????ㄷㄷㄷ

AF_INET

src points to a character string containing an IPv4 network address in dotted-decimal format,

"ddd.ddd.ddd.ddd", where ddd is a decimal number of up to three digits in the range 0 to 255. The

address is converted to a struct in_addr and copied to dst, which must be sizeof(struct in_addr) (4)

bytes (32 bits) long.

AF_INET6

src points to a character string containing an IPv6 network address. The address is converted to a

struct in6_addr and copied to dst, which must be sizeof(struct in6_addr) (16) bytes (128 bits) long.

The allowed formats for IPv6 addresses follow these rules:

1. The preferred format is x:x:x:x:x:x:x:x. This form consists of eight hexadecimal numbers, each

of which expresses a 16-bit value (i.e., each x can be up to 4 hex digits).

2. A series of contiguous zero values in the preferred format can be abbreviated to ::. Only one

instance of :: can occur in an address. For example, the loopback address 0:0:0:0:0:0:0:1 can be

abbreviated as ::1. The wildcard address, consisting of all zeros, can be written as ::.

3. An alternate format is useful for expressing IPv4-mapped IPv6 addresses. This form is written as

x:x:x:x:x:x:d.d.d.d, where the six leading xs are hexadecimal values that define the six most-

significant 16-bit pieces of the address (i.e., 96 bits), and the ds express a value in dotted-

decimal notation that defines the least significant 32 bits of the address. An example of such

an address is ::FFFF:204.152.189.116.

See RFC 2373 for further details on the representation of IPv6 addresses.

IPv6 주소들의 포현에 대한 더 자세함은 RFC2373을 참조하시라.

RETURN VALUE 이게 중요함 ㅋ

inet_pton() returns 1 on success (network address was successfully converted). 0 is returned if src does

not contain a character string representing a valid network address in the specified address family. If af

does not contain a valid address family, -1 is returned and errno is set to EAFNOSUPPORT.

뭐 성공하면 1, 0 일 경우는 올바른 주소를 전달해 줘, af가 이상한 값이면 -1

1 나오면 되겠다..

CONFORMING TO 아래를 따른다나..뽀직수

POSIX.1-2001.

NOTES : 노트 헉 그 노트 아님

Unlike inet_aton(3) and inet_addr(3), inet_pton() supports IPv6 addresses. On the other hand, inet_pton()

accepts only IPv4 addresses in dotted-decimal notation, whereas inet_aton(3) and inet_addr(3) allow the

more general numbers-and-dots notation (hexadecimal and octal number formats, and formats that don't

require all four bytes to be explicitly written). For an interface that handles both IPv6 addresses, and

IPv4 addresses in numbers-and-dots notation, see getaddrinfo(3).

어쨌든 얘는 특이하게 IPv6를 지원한다네, inet_aton과 inet_addr은 아닌가봐.

IPv6와 IPv4 수-점 표기하는 둘다 처리하는 인터페이스는 getaddrinfo를 봐.

BUGS : 뻐그들

AF_INET6 does not recognize IPv4 addresses. An explicit IPv4-mapped IPv6 address must be supplied in src instead.

EXAMPLE

The program below demonstrates the use of inet_pton() and inet_ntop(3). Here are some example runs:

$ ./a.out i6 0:0:0:0:0:0:0:0

$ ./a.out i6 1:0:0:0:0:0:0:8

1::8

$ ./a.out i6 0:0:0:0:0:FFFF:204.152.189.116

::ffff:204.152.189.116

Program source

#include <arpa/inet.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int

main(int argc, char *argv[])

{

unsigned char buf[sizeof(struct in6_addr)];

int domain, s;

char str[INET6_ADDRSTRLEN];

if (argc != 3) {

fprintf(stderr, "Usage: %s {i4|i6|<num>} string\n", argv[0]);

exit(EXIT_FAILURE);

}

domain = (strcmp(argv[1], "i4") == 0) ? AF_INET :

(strcmp(argv[1], "i6") == 0) ? AF_INET6 : atoi(argv[1]);

s = inet_pton(domain, argv[2], buf);

if (s <= 0) {

if (s == 0)

fprintf(stderr, "Not in presentation format");

else

perror("inet_pton");

exit(EXIT_FAILURE);

}

if (inet_ntop(domain, buf, str, INET6_ADDRSTRLEN) == NULL) {

perror("inet_ntop");

exit(EXIT_FAILURE);

}

printf("%s\n", str);

exit(EXIT_SUCCESS);

}

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man inet_pton

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