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[linuxjm/LDP_man-pages.git] / release / man3 / resolver.3

.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified 1993-07-25 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2004-10-31 by aeb
.\"
.\" Japanese Version Copyright (c) 1998 Shinji Orito all rights reserved.
.\"     Translated Mon May 25 21:27:03 JST 1998
.\"             by Shinji Orito <shinji@os.gulf.or.jp>
.\" Updated & Modified Thu Feb 17 03:58:45 JST 2005
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\"
.\"WORD:        resolver        ¥ì¥¾¥ë¥Ð (¥ê¥¾¥ë¥Ð)
.\"WORD:        override        ¥ª¡¼¥Ð¡¼¥é¥¤¥É
.\"WORD:        call    ¸Æ¤Ó½Ð¤·¡¢¸Æ¤Ó½Ð¤¹
.\"WORD:        fully qualified domain name     ´°Á´½¤¾þ¥É¥á¥¤¥ó̾(FQDN)
.\"WORD:        type    ·¿
.\"WORD:        class   ¥¯¥é¥¹
.\"WORD:        query   Ì䤤¹ç¤ï¤»¡¢Ì䤤¹ç¤ï¤»¤ë
.\"WORD:        buffer  ¥Ð¥Ã¥Õ¥¡¡¼
.\"WORD:        lower-level routines    ²¼°Ì¥ë¡¼¥Á¥ó
.\"WORD:        limit of the array      ÇÛÎó¤ÎÈÏ°Ï
.\"WORD:        state information       ¾õÂ֤ξðÊó
.\"WORD:        bitwise ``or''  ¥Ó¥Ã¥Èñ°Ì¤ÎÏÀÍýÏÂ
.\"WORD:        True    ¿¿ÃÍ
.\"WORD:        authoritative   ¸¢°ÒÉÕ¤±¤µ¤ì¤¿
.\"WORD:        recursion desired bit   ºÆµ¢Í×µá¥Ó¥Ã¥È
.\"WORD:        single component names  °ìÉôʬ¤«¤é¤Ê¤ë̾Á°
.\"
.TH RESOLVER 3 2008-11-07 "GNU" "Linux Programmer's Manual"
.SH ̾Á°
res_init, res_query, res_search, res_querydomain, res_mkquery, res_send, dn_comp, dn_expand \- ¥ì¥¾¥ë¥Ð¡¦¥ë¡¼¥Á¥ó
.SH ½ñ¼°
.nf
.B #include <netinet/in.h>
.B #include <arpa/nameser.h>
.B #include <resolv.h>
.B extern struct state _res;
.sp
.B int res_init(void);
.sp
.BI "int res_query(const char *" dname ", int " class ", int " type ,
.RS
.BI "unsigned char *" answer ", int " anslen );
.RE
.sp
.BI "int res_search(const char *" dname ", int " class ", int " type ,
.RS
.BI "unsigned char *" answer ", int " anslen );
.RE
.sp
.BI "int res_querydomain(const char *" name ", const char *" domain ,
.RS
.BI "int " class ", int " type ", unsigned char *" answer ,
.BI "int " anslen );
.RE
.sp
.BI "int res_mkquery(int " op ", const char *" dname ", int " class ,
.RS
.BI "int " type ", char *" data ", int " datalen ", struct rrec *" newrr ,
.BI "char *" buf ", int " buflen );
.RE
.sp
.BI "int res_send(const char *" msg ", int " msglen ", char *" answer ,
.RS
.BI "int " anslen );
.RE
.sp
.BI "int dn_comp(unsigned char *" exp_dn ", unsigned char *" comp_dn ,
.RS
.BI "int " length ", unsigned char **" dnptrs ", unsigned char *" exp_dn ,
.BI "unsigned char **" lastdnptr );
.RE
.sp
.BI "int dn_expand(unsigned char *" msg ", unsigned char *" eomorig ,
.RS
.BI "unsigned char *" comp_dn ", char *" exp_dn ,
.BI "int " length );
.RE
.fi
.sp
\fI\-lresolv\fP ¤Ç¥ê¥ó¥¯¤¹¤ë¡£
.SH ÀâÌÀ
¤³¤ì¤é¤Î´Ø¿ô¤Ï¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤Î¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤ËÌ䤤¹ç¤ï¤»¡¢
¤½¤Î±þÅú¤ò²ò¼á¤¹¤ë¡£
.PP
.BR res_init ()
´Ø¿ô¤Ï¡¢¥Ç¥Õ¥©¥ë¥È¤Î¥É¥á¥¤¥ó̾¡¢¸¡º÷½ç¡¢¥Í¡¼¥à¥µ¡¼¥Ð¡¼
¥¢¥É¥ì¥¹¤òÆÀ¤ë¤¿¤á¤ËÀßÄê¥Õ¥¡¥¤¥ë (resolv.conf(5) »²¾È) ¤òÆɤࡣ
¤â¤·¥µ¡¼¥Ð¡¼¤¬¼¨¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð¥í¡¼¥«¥ë¥Û¥¹¥È¤ò»î¤¹¡£
¥É¥á¥¤¥ó¤¬¼¨¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð¥í¡¼¥«¥ë¥Û¥¹¥È¤ËÉÕ¤±¤é¤ì¤¿¥É¥á¥¤¥ó¤òÍѤ¤¤ë¡£
´Ä¶­ÊÑ¿ô
.B LOCALDOMAIN
¤Ç¥ª¡¼¥Ð¡¼¥é¥¤¥É¤Ç¤­¤ë¡£
.BR res_init ()
¤Ï¡¢¸å½Ò¤¹¤ë´Ø¿ô¤Î¤É¤ì¤«¤¬ºÇ½é¤Ë¸Æ¤Ó½Ð¤µ¤ì¤¿»þ¡¢¤½¤Î´Ø¿ô
¤«¤é¼Â¹Ô¤µ¤ì¤ë¡£
.PP
.BR res_query ()
´Ø¿ô¤Ï¡¢»ØÄꤵ¤ì¤¿ \fItype\fP ¤È \fIclass\fP ¤Î
´°Á´½¤¾þ¥É¥á¥¤¥ó̾ (FQDN) \fIname\fP ¤ò¡¢¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤ØÌ䤤¹ç¤ï¤»¤ë¡£
±þÅú¤Ï¡¢¸Æ¤Ó½Ð¤·¤¿Â¦¤Ë¤è¤Ã¤ÆÍÑ°Õ¤µ¤ì¤ëŤµ \fIanslen\fP ¤Î \fIanswer\fP
¥Ð¥Ã¥Õ¥¡¡¼¤Ë»Ä¤µ¤ì¤ë¡£
.PP
.BR res_search ()
´Ø¿ô¤Ï¡¢Ì䤤¹ç¤ï¤»¤ò¹Ô¤¤
.BR res_query ()
ƱÍͤ½¤Î±þÅú¤ò
ÂԤĤ¬¡¢¤µ¤é¤Ë¥Ç¥Õ¥©¥ë¥È¤ò¼ÂÁõ¤·¤Æ¤ª¤ê
.B RES_DEFNAMES
¤È
.B RES_DNSRCH
¤Ë¤è¤Ã¤Æµ¬Äꤵ¤ì¤ë¸¡º÷¥ë¡¼¥ë¤òŬÍѤ¹¤ë¡£
(²¼µ­ \fI_res\fP ¥ª¥×¥·¥ç¥ó¤ÎÀâÌÀ¤ò»²¾È)
.PP
.BR res_querydomain ()
´Ø¿ô¤Ï \fIname\fP ¤È \fIdomain\fP ¤Î·ë¹ç¤Ë
.BR res_query ()
¤òÍѤ¤¤ÆÌ䤤¹ç¤ï¤»¤ò¹Ô¤¦¡£
.PP
¼¡¤Î´Ø¿ô¤Ï¡¢
.BR res_query ()
¤Ç»È¤ï¤ì¤ë²¼°Ì¥ë¡¼¥Á¥ó¤Ç¤¢¤ë¡£
.PP
.BR res_mkquery ()
´Ø¿ô¤Ï¡¢¥É¥á¥¤¥ó̾ \fIdname\fP ¤Î°Ù¤Ë¡¢Ä¹¤µ \fIbuflen\fP
¤Î \fIbuf\fP ¤ËÌ䤤¹ç¤ï¤»¤ë¥á¥Ã¥»¡¼¥¸¤òºîÀ®¤¹¤ë¡£
Ì䤤¹ç¤ï¤»¤Î·¿ \fIop\fP ¤ÏÄ̾ï
.B QUERY
¤À¤¬¡¢ \fI<arpa/nameser.h>\fP ¤ÇÄêµÁ¤µ¤ì¤¿·¿¤Î¤É¤ì¤Ç¤âÎɤ¤¡£
\fInewrr\fP ¤Ï¸½ºß»ÈÍѤµ¤ì¤Æ¤¤¤Ê¤¤¡£
.PP
.BR res_send ()
´Ø¿ô¤Ï¡¢Ä¹¤µ \fImsglen\fP ¤Î \fImsg\fP ¤Ë·è¤á¤é¤ì¤¿½ñ¼°
¤ÇÌ䤤¹ç¤ï¤»¡¢\fIanswer\fP ¤ËŤµ \fIanslen\fP ¤Î²óÅú¤òÊÖ¤¹¡£
¤Þ¤À¸Æ¤Ó½Ð¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð
.BR res_init ()
¤ò¸Æ¤Ó½Ð¤¹¡£
.PP
.BR dn_comp ()
´Ø¿ô¤Ï¥É¥á¥¤¥ó̾ \fIexp_dn\fP ¤ò°µ½Ì¤·¤Æ¡¢Ä¹¤µ \fIlength\fP
¤Î¥Ð¥Ã¥Õ¥¡¡¼ \fIcomp_dn\fP ¤ËÊݸ¤¹¤ë¡£
°µ½Ì¤Ë¤Ï¥Ý¥¤¥ó¥¿¡¼ÇÛÎó \fIdnptrs\fP ¤òÍѤ¤¤ë¡£
¤³¤ì¤é¤Î¥Ý¥¤¥ó¥¿¡¼¤Ï¡¢¸½ºß¤Î¥á¥Ã¥»¡¼¥¸¤ÎÃæ¤Ë¤¢¤ë°ÊÁ°¤Ë°µ½Ì¤µ¤ì¤¿Ì¾Á°¤ò»Ø¤¹¡£
ºÇ½é¤Î¥Ý¥¤¥ó¥¿¡¼¤Ï¥á¥Ã¥»¡¼¥¸¤ÎËÁƬ¤ò»Ø¤·¡¢¤½¤Î¥ê¥¹¥È¤Ï NULL ¤Ç½ª¤ï¤ë¡£
ÇÛÎó¤ÎÈÏ°Ï¤Ï \fIlastdnptr\fP ¤Ç·è¤á¤é¤ì¤ë¡£
\fIdnptr\fP ¤¬ NULL ¤Ê¤é¤Ð¥É¥á¥¤¥ó̾¤Ï°µ½Ì¤µ¤ì¤Ê¤¤¡£
\fIlastdnptr\fP ¤¬ NULL ¤Ê¤é¤Ð¡¢¤½¤Î¥é¥Ù¥ë¤Î¥ê¥¹¥È¤Ï¥¢¥Ã¥×¥Ç¡¼¥È¤µ¤ì¤Ê¤¤¡£
.PP
.BR dn_expand ()
´Ø¿ô¤Ï¡¢°µ½Ì¤µ¤ì¤¿¥É¥á¥¤¥ó̾ \fIcomp_dn\fP ¤«¤é¥µ¥¤¥º
¤¬ \fIlength\fP ¤Î \fIexp_dn\fP ¥Ð¥Ã¥Õ¥¡¡¼¤ËÀµ¼°¤Ê¥É¥á¥¤¥ó̾¤òŸ³«¤¹¤ë¡£
¤½¤Î°µ½Ì¤µ¤ì¤¿Ì¾Á°¤Ï¡¢Ì䤤¹ç¤ï¤»¡¢¤Þ¤¿¤Ï±þÅú¥á¥Ã¥»¡¼¥¸¤Ë´Þ¤Þ¤ì¤Æ¤¤¤Æ¡¢
\fImsg\fP ¤¬¥á¥Ã¥»¡¼¥¸¤ÎËÁƬ¤ò»Ø¤¹¡£
.PP
¥ì¥¾¥ë¥Ð¡¦¥ë¡¼¥Á¥ó¤Ï¡¢\fI<resolv.h>\fP ¤ËÄêµÁ¤µ¤ì¤¿ \fI_res\fP ¹½Â¤ÂΤË
´Þ¤Þ¤ì¤Æ¤¤¤ëÁ´ÂÎŪ¤ÊÀßÄê¤È¾õÂ֤ξðÊó¤ò»ÈÍѤ¹¤ë¡£
Ä̾ï¥æ¡¼¥¶¡¼¤ËÁàºî¤Ç¤­¤ë¹àÌÜ¤Ï \fI_res.options\fP ¤À¤±¤Ç¤¢¤ë¡£
¤³¤Î¹àÌܤϰʲ¼¤Î¥ª¥×¥·¥ç¥ó¤Î¥Ó¥Ã¥Èñ°Ì¤ÎÏÀÍýϤˤǤ­¤ë¡£
.TP
.B RES_INIT
.BR res_init ()
¤¬¸Æ¤Ó½Ð¤µ¤ì¤Æ¤¤¤ì¤Ð¿¿¡£
.TP
.B RES_DEBUG
¥Ç¥Ð¥Ã¥°¡¦¥á¥Ã¥»¡¼¥¸¤ò½ÐÎϤ¹¤ë¡£
.TP
.B RES_AAONLY
¸¢°ÒÉÕ¤±¤µ¤ì¤¿ (authoritative) ²óÅú¤Î¤ß¼õ¤±Æþ¤ì¤ë¡£
.BR res_send ()
¤Ï¡¢ºÇ½ªÅª¤Ë¸¢°ÒÉÕ¤±¤µ¤ì¤¿²óÅú¤òÆÀ¤é¤ì¤ë¤«¡¢¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤ë
¤Þ¤Ç³¹Ô¤¹¤ë¡£
[¸½ºß¼ÂÁõ¤µ¤ì¤Æ¤¤¤Ê¤¤]
.TP
.B RES_USEVC
Ì䤤¹ç¤ï¤»¤Ë UDP ¥Ç¡¼¥¿¥°¥é¥à¤Ç¤Ï¤Ê¤¯ TCP Àܳ¤òÍѤ¤¤ë¡£
.TP
.B RES_PRIMARY
¥×¥é¥¤¥Þ¥ê¡¦¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤Î¤ßÌ䤤¹ç¤ï¤»¤ë¡£
.TP
.B RES_IGNTC
ÀÚ¤êµÍ¤á¥¨¥é¡¼ (truncation error) ¤ò̵»ë¤¹¤ë¡£TCP ¤Ç¥ê¥È¥é¥¤¤·¤Ê¤¤¡£
[¸½ºß¼ÂÁõ¤µ¤ì¤Æ¤¤¤Ê¤¤]
.TP
.B RES_RECURSE
ºÆµ¢Í×µá (recursion desired) ¥Ó¥Ã¥È¤òÌ䤤¹ç¤ï¤»¤ËÀßÄꤹ¤ë¡£
ºÆµ¢¤Ï
.BR res_send ()
¤Ç¤Ï¤Ê¤¯¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤Ë¤è¤Ã¤Æ¹Ô¤ï¤ì¤ë¡£
[¥Ç¥Õ¥©¥ë¥È¤ÇÍ­¸ú]
.TP
.B RES_DEFNAMES
ÀßÄꤵ¤ì¤Æ¤¤¤ì¤Ð¡¢
.BR res_search ()
¤Ï¥Ç¥Õ¥©¥ë¥È¤Î¥É¥á¥¤¥ó̾¤ò°ìÉôʬ
¤Î¤ß¤«¤é¤Ê¤ë̾Á°¡¢¤¹¤Ê¤ï¤Á¥É¥Ã¥È¤ò´Þ¤Þ¤Ê¤¤Ì¾Á°¤ËÉÕ¤±²Ã¤¨¤ë¡£
[¥Ç¥Õ¥©¥ë¥È¤ÇÍ­¸ú]
.TP
.B RES_STAYOPEN
Ì䤤¹ç¤ï¤»Ãæ¤Ë TCP Àܳ¤òÊݤĤ¿¤á
.B RES_USEVC
¤È¶¦¤ËÍѤ¤¤é¤ì¤ë¡£
.TP
.B RES_DNSRCH
ÀßÄꤵ¤ì¤Æ¤¤¤ì¤Ð¡¢
.BR res_search ()
¤Ï¸½ºß¤Î¥É¥á¥¤¥ó¤ª¤è¤Ó¿Æ¥É¥á¥¤¥ó¤Î
¥Û¥¹¥È̾¤òõ¤¹¡£¤³¤Î¥ª¥×¥·¥ç¥ó¤Ï
.BR gethostbyname (3)
¤ÇÍѤ¤¤é¤ì¤ë¡£
[¥Ç¥Õ¥©¥ë¥È¤ÇÍ­¸ú]
.SH ÊÖ¤êÃÍ
.BR res_init ()
´Ø¿ô¤ÏÀ®¸ù¤¹¤ì¤Ð 0 ¤ò¡¢¥¨¥é¡¼¤¬È¯À¸¤¹¤ì¤Ð \-1 ¤òÊÖ¤¹¡£
.PP
.BR res_query (),
.BR res_search (),
.BR res_querydomain (),
.BR res_mkquery (),
.BR res_send ()
´Ø¿ô¤Ï±þÅú¤ÎŤµ¤òÊÖ¤¹¡£
¤Þ¤¿¡¢¥¨¥é¡¼¤¬È¯À¸¤¹¤ì¤Ð \-1 ¤òÊÖ¤¹¡£
.PP
.BR dn_comp ()
¤È
.BR dn_expand ()
´Ø¿ô¤Ï°µ½Ì¤µ¤ì¤¿¥É¥á¥¤¥ó̾¤ÎŤµ¤òÊÖ¤¹¡£
¤Þ¤¿¡¢¥¨¥é¡¼¤¬È¯À¸¤¹¤ì¤Ð \-1 ¤òÊÖ¤¹¡£
.SH ¥Õ¥¡¥¤¥ë
.nf
/etc/resolv.conf          ¥ì¥¾¥ë¥ÐÀßÄê¥Õ¥¡¥¤¥ë
/etc/host.conf            ¥ì¥¾¥ë¥ÐÀßÄê¥Õ¥¡¥¤¥ë
.fi
.SH ½àµò
4.3BSD.
.SH ´ØÏ¢¹àÌÜ
.BR gethostbyname (3),
.BR resolv.conf (5),
.BR resolver (5),
.BR hostname (7),
.BR named (8)