getipnodebyname

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#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

struct hostent *getipnodebyname(const char *name,
                         int af, int flags,
                         int *error_num);

struct hostent *getipnodebyaddr(const void *addr,
                         size_t len, int af,
                         int *error_num);

void freehostent(struct hostent *ip);

ÀâÌÀ

struct  hostent {
        char    *h_name;
        char    **h_aliases;
        int     h_addrtype;
        int     h_length;
        char    **h_addr_list;
};

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¤³¤ì¤é¤Î´Ø¿ô¤Ï¡¢ gethostby ¤Î´Ø¿ô·²¤È°Û¤Ê¤ê¡¢Æ°Åª¤Ë³ä¤êÅö¤Æ¤é¤ì¤¿¥á¥â¥ê¤Ø¤Î¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£ ¸Æ¤Ó½Ð¤·¸µ¤¬¤³¤ì¤é¤Î hostent ¹½Â¤ÂΤòɬÍפȤ·¤Ê¤¯¤Ê¤Ã¤¿¸å¤Ï¡¢ freehostent(3) ´Ø¿ô¤òÍѤ¤¤ì¤ÐưŪ¤Ê³ä¤êÅö¤Æ¥á¥â¥ê¤ò²òÊü¤Ç¤­¤ë¡£  

getipnodebyname ¤Î°ú¤­¿ô

AF_INET

name °ú¤­¿ô¤Ï¡¢¥É¥Ã¥È¤Ç 4 ¤Ä¤Ë¶èÀÚ¤é¤ì¤¿ IPv4 ¥¢¥É¥ì¥¹¤«¡¢ IPv4 ¥Í¥Ã¥È¥ï¡¼¥¯¥Û¥¹¥È¤Î̾Á°¤Ø¤Î¥Ý¥¤¥ó¥¿¤Ç¤¢¤ë¡£

AF_INET6

name °ú¤­¿ô¤Ï¡¢16 ¿Ê¤Î IPv6 ¥¢¥É¥ì¥¹¤«¡¢ IPv6 ¥Í¥Ã¥È¥ï¡¼¥¯¥Û¥¹¥È¤Î̾Á°¤Ø¤Î¥Ý¥¤¥ó¥¿¤Ç¤¢¤ë¡£

flags ¥Ñ¥é¥á¡¼¥¿¤Ë¤ÏÄɲäΥª¥×¥·¥ç¥ó¤ò»ØÄꤹ¤ë¡£ Ê£¿ô¤Î¥Õ¥é¥°¤ò»ØÄꤹ¤ë¤Ë¤Ï¡¢¤½¤ì¤é¤ÎÏÀÍý OR ¤ò¤È¤Ã¤Æ»ØÄꤹ¤ì¤Ð¤è¤¤¡£ ¥ª¥×¥·¥ç¥ó¤ò¤Ò¤È¤Ä¤â»ØÄꤷ¤¿¤¯¤Ê¤¤¤È¤­¤Ë¤Ï¡¢ flags ¤Ë 0 ¤òÀßÄꤹ¤ëɬÍפ¬¤¢¤ë¡£

AI_V4MAPPED

¤³¤Î¥Õ¥é¥°¤Ï AF_INET6 ¤È¶¦¤ËÍѤ¤¤é¤ì¡¢IPv6 ¥¢¥É¥ì¥¹¤ÎÂå¤ï¤ê¤Ë IPv4 ¥¢¥É¥ì¥¹¤òÌ䤤¹ç¤ï¤»¤ë¡£ Ìä¹ç¤ï¤»¤ë IPv4 ¥¢¥É¥ì¥¹¤Ï IPv6 ¥¢¥É¥ì¥¹¤Ë¥Þ¥Ã¥×¤µ¤ì¤ë¡£

AI_ALL

¤³¤Î¥Õ¥é¥°¤Ï AI_V4MAPPED ¤È¶¦¤ËÍѤ¤¤é¤ì¡¢IPv4 ¥¢¥É¥ì¥¹¤È IPv6 ¥¢¥É¥ì¥¹¤ÎξÊý¤òÌ䤤¹ç¤ï¤»¤ë¡£ ¸«¤Ä¤«¤Ã¤¿ IPv4 ¥¢¥É¥ì¥¹¤Ï¡¢¤¹¤Ù¤Æ IPv6 ¥¢¥É¥ì¥¹¤Ë¥Þ¥Ã¥×¤µ¤ì¤ë¡£

AI_ADDRCONFIG

¤³¤Î¥Õ¥é¥°¤Ï AF_INET6 ¤È¶¦¤ËÍѤ¤¤é¤ì¡¢ IPv6 ¤¬³ä¤êÅö¤Æ¤é¤ì¤¿¥Í¥Ã¥È¥ï¡¼¥¯¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤¬ ¥·¥¹¥Æ¥à¤Ë¤Ò¤È¤Ä¤â¤Ê¤±¤ì¤Ð IPv6 ¥¢¥É¥ì¥¹¤ÎÌä¹ç¤ï¤»¤ò¹Ô¤ï¤º¡¢ IPv4 ¤¬³ä¤êÅö¤Æ¤é¤ì¤¿¥Í¥Ã¥È¥ï¡¼¥¯¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤¬ ¥·¥¹¥Æ¥à¤Ë¤Ò¤È¤Ä¤â¤Ê¤±¤ì¤Ð IPv4 ¥¢¥É¥ì¥¹¤ÎÌä¹ç¤ï¤»¤ò¹Ô¤ï¤Ê¤¤¤è¤¦¤ËÍ׵᤹¤ë¡£ ¤³¤Î¥Õ¥é¥°¤ÏñÆȤǤ⡢¤¢¤ë¤¤¤Ï AI_V4MAPPED ¥Õ¥é¥°¤È¶¦¤Ë¤Ç¤âÍѤ¤¤ë¤³¤È¤¬¤Ç¤­¤ë¡£

AI_ALL

¤³¤Î¥Õ¥é¥°¤Ï (AI_ADDRCONFIG|AI_V4MAPPED) ¤ÈÅù²Á¤Ç¤¢¤ë¡£

getipnodebyaddr ¤Î¥Ñ¥é¥á¡¼¥¿

AF_INET

addr °ú¤­¿ô¤Ï struct in_addr ¤Ø¤Î¥Ý¥¤¥ó¥¿¡¼¤Ç¤¢¤ê¡¢ len °ú¤­¿ô¤Ï sizeof(struct in_addr) ¤ËÀßÄꤷ¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

AF_INET6

addr °ú¤­¿ô¤Ï struct in6_addr ¤Ø¤Î¥Ý¥¤¥ó¥¿¡¼¤Ç¤¢¤ê¡¢ len °ú¤­¿ô¤Ï sizeof(struct in6_addr) ¤ËÀßÄꤷ¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

ÊÖ¤êÃÍ

HOST_NOT_FOUND

¥Û¥¹¥È̾¤Þ¤¿¤Ï¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤¬¸«¤Ä¤«¤é¤Ê¤«¤Ã¤¿¡£

NO_ADDRESS

¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤Ï ¤½¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤Þ¤¿¤Ï¥Í¥Ã¥È¥ï¡¼¥¯Ì¾¤òǧ¼±¤·¤¿¤¬¡¢ ÊÖ»ö¤¬Ê֤äƤ³¤Ê¤«¤Ã¤¿¡£¸¶°ø¤È¤·¤Æ¤Ï¡¢ Î㤨¤Ð IPv4 ¥¢¥É¥ì¥¹¤·¤«»ý¤¿¤Ê¤¤¥Í¥Ã¥È¥ï¡¼¥¯¥Û¥¹¥È¤ËÂФ·¤Æ IPv6 ¤Î¾ðÊó¤ÎÌ䤤¹ç¤ï¤»¤¬¹Ô¤ï¤ì¤¿ (¤ª¤è¤Ó¤½¤ÎµÕ) ¤Ê¤É¤¬¹Í¤¨¤é¤ì¤ë¡£

NO_RECOVERY

¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤«¤é¹±µ×Ū¤Ê¼ºÇÔ (permanent failure) ¤ò°ÕÌ£¤¹¤ëÊÖ»ö¤¬ÊÖ¤µ¤ì¤¿¡£

TRY_AGAIN

¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤«¤é°ì»þŪ¤Ê¼ºÇÔ (temporary failure) ¤ò°ÕÌ£¤¹¤ëÊÖ»ö¤¬ÊÖ¤µ¤ì¤¿¡£¼¡¤Ë¤Ï¤â¤¦¤Á¤ç¤Ã¤È±¿¤¬É¬Íפ«¤â¡£

Ì䤤¹ç¤ï¤»¤ËÀ®¸ù¤¹¤ë¤È¡¢ hostent ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤¬ÊÖ¤µ¤ì¤ë¡£ ¤³¤Î¹½Â¤ÂΤϰʲ¼¤Î¥Õ¥£¡¼¥ë¥É¤«¤é¤Ê¤ë¡£

h_name

¤³¤ì¤Ï¤³¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥Û¥¹¥È¤Î¥ª¥Õ¥£¥·¥ã¥ë¤Ê̾Á°¤Ç¤¢¤ë¡£

h_aliases

¤³¤ì¤Ï¡¢¤½¤Î¥Û¥¹¥È¤Î¥ª¥Õ¥£¥·¥ã¥ë¤Ç¤Ê¤¤ÊÌ̾¤Ø¤Î¥Ý¥¤¥ó¥¿¡¼¤ÎÇÛÎó¤Ç¤¢¤ë¡£ ÇÛÎó¤Ï¥Ì¥ë¡¦¥Ý¥¤¥ó¥¿¡¼¤Ç½ªÃ¼¤¹¤ë¡£

h_addrtype

¤³¤ì¤Ï getipnodebyname(3) ¤Þ¤¿¤Ï getipnodebyaddr(3) ¤ËÍ¿¤¨¤é¤ì¤¿ af °ú¤­¿ô¤Î¥³¥Ô¡¼¤Ç¤¢¤ë¡£ af °ú¤­¿ô¤¬ AF_INET ¤Ê¤é h_addrtype ¤Ï¾ï¤Ë AF_INET ¤Ë¤Ê¤ê¡¢ af °ú¤­¿ô¤¬ AF_INET6 ¤Ê¤é h_addrtype ¤â¾ï¤Ë AF_INET6 ¤Ë¤Ê¤ë¡£

h_length

¤³¤Î¥Õ¥£¡¼¥ë¥É¤Ï¡¢ h_addrtype ¤¬ AF_INET ¤Ê¤é sizeof(struct in_addr) ¤Ë¡¢ h_addrtype ¤¬ AF_INET6 ¤Ê¤é sizeof(struct in6_addr) ¤ËÀßÄꤵ¤ì¤ë¡£

h_addr_list

¤³¤ì¤Ï¤Ò¤È¤Ä°Ê¾å¤Î¥Ý¥¤¥ó¥¿¡¼¤ÎÇÛÎó¤Ç¡¢ ¤½¤ì¤¾¤ì¤Î¥Ý¥¤¥ó¥¿¡¼¤Ï¡¢ ¤½¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥Û¥¹¥È¤ËÂбþ¤¹¤ë¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¹½Â¤ÂΤò»Ø¤¹¡£ ¤³¤ÎÇÛÎó¤Ï¥Ì¥ë¥Ý¥¤¥ó¥¿¤Ç½ªÃ¼¤¹¤ë¡£

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Index

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getipnodebyname ¤Î°ú¤­¿ô

getipnodebyaddr ¤Î¥Ñ¥é¥á¡¼¥¿

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