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inet_aton, inet_addr, inet_network, inet_ntoa, inet_ntop, inet_pton, inet_makeaddr, inet_lnaof, inet_netof — ???󥿡??ͥåȥ??ɥ쥹?????ؿ?

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Standard C Library (libc, -lc)

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<sys/types.h> <sys/socket.h> <netinet/in.h> <arpa/inet.h> int inet_aton(const char *cp, struct in_addr *pin) unsigned long inet_addr(const char *cp) unsigned long inet_network(const char *cp) char * inet_ntoa(struct in_addr in) const char * inet_ntop(int af, const void *src, char *dst, size_t size) int inet_pton(int af, const char *src, void *dst) struct in_addr inet_makeaddr(unsigned long net, unsigned long lna) unsigned long inet_lnaof(struct in_addr in) unsigned long inet_netof(struct in_addr in)

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inet_aton(), inet_addr() ?????? inet_network() ?롼?????ϡ????󥿡??ͥå?ɸ???? ‘.’ ɽ??ˡ?Ǽ??????????ͤ?ɽ?????Ƥ???ʸ?????????ᤷ?ޤ???

inet_pton() ?ؿ??ϡ?ɽ???????Υ??ɥ쥹 (?Ĥޤ?ʸ???????ݻ??????Ƥ?????????ǽ?ʷ???) ???? ?ͥåȥ?????? (?̾? struct in_addr ?⤷????¾??????Ū?ʥХ??ʥ?ɽ???????ǡ??ͥåȥ???Х??ȥ?????) ?ؤ? ?Ѵ????Ԥ??ޤ??? ???δؿ??ϡ????ꤵ?줿???ɥ쥹?ե??ߥ??ˤ????ơ????ɥ쥹?? ͭ???ʤ??ΤǤ????? 1 ???֤????ѡ????Ǥ??ʤ????? 0 ???֤??ޤ??? ?ޤ??????ƥ२?顼??ȯ???????? (???ξ????? errno ?????ꤵ???ޤ?) ?ˤϡ?-1 ???֤??ޤ??? ???δؿ??ϸ??? AF_INET ?? AF_INET6 ???Ф???ͭ???Ǥ???

inet_aton() ?롼?????ϡ????ꤵ?줿ʸ?????򥤥󥿡??ͥåȥ??ɥ쥹?Ȥ??Ʋ??ᤷ?? Ϳ?????줿??¤?Τ????˥??ɥ쥹?????ꤷ?ޤ??? ʸ???????????˲??ᤵ??????Ʊ?롼?????? 1 ???֤??? ʸ??????̵???ΤȤ? 0 ???֤??ޤ??? inet_addr() ?? inet_network() ?ؿ??Ϥ??줾?졢 ???󥿡??ͥåȥ??ɥ쥹?ȥ??󥿡??ͥåȥͥåȥ???ֹ??Ȥ??ƻȤ??Τ? Ŭ???????ͤ??֤??ޤ???

inet_ntop() ?ؿ??ϡ??ͥåȥ?????? (?̾? struct in_addr ?⤷????¾??????Ū?ʥХ??ʥ??????ǡ??ͥåȥ???Х??ȥ?????) ???? ɽ?????? (??????ɽ???????Τ?Ŭ????????) ?ؤ??Ѵ????Ԥ??ޤ??? ???δؿ??ϡ??????ƥ२?顼??ȯ???????? (???ξ????? errno ?????ꤵ???ޤ?) ?ˤϥ̥????֤????????ʳ??λ?????Ū??ʸ?????ؤ? ?ݥ??󥿤??֤??ޤ??? ???δؿ??ϸ??? AF_INET ?? AF_INET6 ???Ф???ͭ???Ǥ???

inet_ntoa() ?롼?????ϡ????󥿡??ͥåȥ??ɥ쥹?????????? ‘.’ ɽ??ˡ?Υ??ɥ쥹?򼨤? ASCII ʸ???????֤??ޤ??? inet_makeaddr() ?롼?????ϥ??󥿡??ͥåȥͥåȥ???ֹ??? ?????????ͥåȥ?????ɥ쥹?????????ꡢ ?????????ˤ??ƥ??󥿡??ͥåȥ??ɥ쥹?????????ޤ??? inet_netof() ?? inet_lnaof() ?롼?????ϥ??󥿡??ͥåȥۥ??ȥ??ɥ쥹??ʬ?䤷?ơ? ???줾???ͥåȥ???ֹ??ȥ????????ͥåȥ?????ɥ쥹???Ȥ????֤??ޤ???

???٤ƤΥ??󥿡??ͥåȥ??ɥ쥹?ϥͥåȥ???????? (?????鱦?ؤ? ?Х??Ƚ?) ???֤????ޤ??? ?ͥåȥ???ֹ??ȥ??????륢?ɥ쥹???Ϥ??٤ƥޥ??????????????ͤ? ?֤????ޤ???

???󥿡??ͥåȥ??ɥ쥹

‘.’ ɽ??ˡ?ǻ??ꤵ?????ͤϼ??Τɤ줫???Ĥη??????????ޤ???

a.b.c.d
a.b.c
a.b
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4 ?Ĥ???ʬ???ɥ쥹?????ꤵ?????ȡ?????ʬ?? 1 ?Х??ȤΥǡ????Ȳ??ᤵ???ơ? ?????鱦?ν??ǥ??󥿡??ͥåȥ??ɥ쥹?? 4 ?Х??Ȥ˳??????Ƥ????ޤ??? ???󥿡??ͥåȥ??ɥ쥹?? VAX ???? 32 ?ӥåȤ??????ͤǤ????ȸ??ʤ??????Ȥ????嵭?˳????????Х??Ȥϡ? “d.c.b.a” ??ɽ???????뤳?Ȥ????դ??Ʋ??????? ???ʤ????? VAX ?ΥХ??ȥ??????ϱ????麸?ν??ˤʤ??ޤ???

3 ?Ĥ???ʬ???ɥ쥹?????ꤵ?????ȡ??Ǹ?????ʬ?? 16 ?ӥå??ͤȲ??ᤵ???ơ? ?ͥåȥ?????ɥ쥹?α?ü?? 2 ?Х??Ȥˤʤ??ޤ??? ?????ˤ??? 3 ?Ĥ???ʬ???ɥ쥹?????? Class B ?ͥåȥ?????ɥ쥹?? “128.net.host” ?Ȼ????Ǥ????????Ǥ???

2 ?Ĥ???ʬ???ɥ쥹??Ϳ?????????ȡ??Ǹ?????ʬ???ɥ쥹?? 24 ?ӥå??ͤȤ??? ???ᤵ???ơ??ͥåȥ?????ɥ쥹?α?ü?? 3 ?Х??Ȥˤʤ??ޤ??? ?????ˤ??? 2 ?Ĥ???ʬ???ɥ쥹?????? Class A ?ͥåȥ?????ɥ쥹?? “net.host” ?Ȼ????Ǥ????????Ǥ???

1 ?Ĥ???ʬ???ɥ쥹???????ꤵ?????ȡ??ͤϥХ??Ȥκ?Ĵ???ʤ??? ľ?ܥͥåȥ?????ɥ쥹????¸?????ޤ???

‘.’ ɽ??ˡ?? “??ʬ” ?Ȥ??ƶ??뤵???????ͤϤ??٤ơ?C ?????ǻ??ꤵ???? 10 ?ʿ???8 ?ʿ???16 ?ʿ??? ?????줫?η????????뤳?Ȥ??Ǥ??ޤ? (???ʤ????????Ԥ? 0x ?ޤ??? 0X ?? 16 ?ʿ?????̣???? ???Ԥ??? 0 ?? 8 ?ʿ?????̣???????ͤ? 10 ?ʿ??Ȳ??ᤵ???ޤ?) ??

inet_aton() ?? inet_ntoa() ?ؿ??ϴ?ʬ?򤱤??٤??ؿ??ǡ??ष?? addr2ascii(3) ?ե??ߥ꤬?Ȥ????ޤ??? ???????????????δؿ??Ϥޤ??????????????Ƥ??ʤ????ᡢ ???̡??ܿ????Τ????ץ????????Ϥ??????δؿ??˰?¸?Ǥ????? inet(3) ?ؿ????Ȥ???³?????Ǥ??礦??

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inet_addr() ?? inet_network() ?Ϸ?????ȿ???׵????Ф? INADDR_NONE ???????֤??ޤ???

??Ϣ????

addr2ascii(3), gethostbyname(3), getnetent(3), hosts(5), networks(5) IP Version 6 Addressing Architecture, RFC, 2373, July 1998.

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inet_ntop() ?? inet_pton() ?ؿ??ϡ? X/Open Networking Services Issue 5.2 (“XNS5.2”) ??Ŭ?礷?Ƥ??ޤ??? inet_pton() ?ؿ??ϡ?1 ?ġ?2 ?Ĥ⤷???? 3 ?ĤΥɥåȷ????Υ??ɥ쥹?ˤ? ?б????Ƥ??ʤ????Ȥ????դ??Ƥ????????? ???ɥ쥹?? 4 ?Ĥ?ʬ???ơ?10 ?ʿ??ǻ??ꤷ?ʤ????Фʤ??ޤ????? ?????? inet_aton() ?ؿ??????????뤳?ȤΤǤ??????ϥ??åȤ????⤻?ޤ????ΤǤ???

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???????δؿ??? 4.2BSD ???о줷?ޤ?????

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INADDR_NONE (0xffffffff) ?ͤ?ͭ???ʥ֥????ɥ??㥹?ȥ??ɥ쥹?Ǥ????? inet_addr() ?Ϥ????ͤ??֤????˼??Ԥ򼨤??Ƥ??ޤ??ޤ??? ?????? inet_aton() ?ؿ??Ǥϡ??????????ϲ??褵???Ƥ??ޤ??? ?ۥ??ȥХ??ȥ??????Хͥåȥ???Х??ȥ????????????Ϻ??𤷤????Ǥ??? inet_ntoa() ???֤?ʸ????????Ū???????ΰ??˼????????ޤ???

inet_addr ?? struct in_addr ???֤?ɬ?פ??????ޤ???