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dhcp-eval

Langue: ja

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Version: 366198 (ubuntu - 25/10/10)

Section: 5 (Format de fichier)

Sommaire

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dhcp-eval - ISC DHCP €Ë€ª€±€ëŸò·ïÉÕ€ÉŸ²Á

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Internet Systems Consortium €Î DHCP ¥¯¥é¥€¥¢¥ó¥È€È¥µ¡Œ¥Ð€Ï¡¢€É€Á€é€â Œõ¿®€¹€ë¥Ñ¥±¥Ã¥È€Ë°ÍÂž€·€¿Ÿò·ïÉÕ€Æ°ºî€ò¹Ô€ŠÇœÎÏ€ò»ý€Á€Þ€¹¡£ Ÿò·ïÉÕ€Æ°ºî€ÎÊžË¡€ò€³€³€ËŒš€·€Þ€¹¡£

»²ŸÈ: Ÿò·ïÉÕ€Æ°ºî

Ÿò·ïÉÕ€Æ°ºî€Ï¡¢if, else, elsif Êž€ò»ÈÍÑ€·€Æ»ØÄê€·€Þ€¹¡£ Ÿò·ïÊž€Ï¡¢ÄÌŸïÊž (option Êž) €¬ÅÐŸì²ÄÇœ€ÊŸìœê€Ï€É€³€Ë€Ç€âÅÐŸì²ÄÇœ€Ç€¢€ê¡¢ €Þ€¿€³€Î€è€Š€ÊÊž€ò³ç€ë€³€È€â²ÄÇœ€Ç€¹¡£ ¥µ¡Œ¥Ð€Ë€ª€±€ëŸò·ïÊž€ÏŒ¡€Î€è€Š€Ë€Ê€ë€³€È€¬Â¿€€€Ç€·€ç€Š:

 if option dhcp-user-class = "accounting" {
   max-lease-time 17600;
   option domain-name "accounting.example.org";
   option domain-name-servers ns1.accounting.example.org, 
                              ns2.accounting.example.org;
 } elsif option dhcp-user-class = "sales" {
   max-lease-time 17600;
   option domain-name "sales.example.org";
   option domain-name-servers ns1.sales.example.org, 
                              ns2.sales.example.org;
 } elsif option dhcp-user-class = "engineering" {
   max-lease-time 17600;
   option domain-name "engineering.example.org";
   option domain-name-servers ns1.engineering.example.org, 
                              ns2.engineering.example.org;
 } else {
   max-lease-time 600;
   option domain-name "misc.example.org";
   option domain-name-servers ns1.misc.example.org, 
                              ns2.misc.example.org;
 }

¥¯¥é¥€¥¢¥ó¥ÈÂŠ€Ç€Ï¡¢Ÿò·ïÉÕ€ÉŸ²Á€ÎÎã€ÏŒ¡€Î€è€Š€Ë€Ê€ë€Ç€·€ç€Š:

 # example.org €Ï¥Õ¥¡¥€¥ä¥Š¥©¡Œ¥ë€Ç DNS €ò¥Õ¥£¥ë¥¿€¹€ë€Î€Ç¡¢
 # example.org ¥Í¥Ã¥È¥ï¡Œ¥¯€Ë·Ò€¬€ë€È€€Î€ß¡¢€œ€Î DNS ¥µ¡Œ¥Ð€ò»ÈÍÑ€·€Þ€¹¡£
 # example.org €Ë·Ò€¬€ë€Î€Ç€Ï€Ê€€Ÿì¹ç¡¢Œ«žÊ€Î DNS ¥µ¡Œ¥Ð€òÍ¥Àè»ÈÍÑ€·€Þ€¹¡£
 if not option domain-name = "example.org" {
   prepend domain-name-servers 127.0.0.1;
 }

if Êž€È elsif ·ÑÂ³Êž€Ï¡¢°ú¿ô€È€·€Æ¥Ö¡Œ¥ëŒ°€òŒè€ê€Þ€¹¡£ €Ä€Þ€ê¡¢€³€ì€é€ÎÊž€Ï¡¢ÉŸ²Á€µ€ì€ë€È¥Ö¡Œ¥ëÃÍ€Î·ë²Ì€òÀžÀ®€¹€ëŒ°€òŒè€ê€Þ€¹¡£ Œ°€ÎÉŸ²Á·ë²Ì€¬¿¿€Ë€Ê€ë€È¡¢ if Êž€ÎÄŸžå€Î¥Ö¥ì¡Œ¥¹€Ç³ç€é€ì€¿Êž€¬ŒÂ¹Ô€µ€ì¡¢žåÂ³€¹€ë elsif €È else €ÎÀá€Ï¥¹¥¥Ã¥×€µ€ì€Þ€¹¡£ €œ€Š€Ç€Ê€€Ÿì¹ç¡¢ÉŸ²Á·ë²Ì€¬¿¿€Ë€Ê€ë elsif Àá€ËœÐ²ñ€Š€Þ€Ç¡¢žåÂ³€¹€ë³Æ elsif Àá€ÎŒ°€¬¥Á¥§¥Ã¥¯€µ€ì€Þ€¹¡£ €œ€Î€è€Š€ÊÀá€¬ž«ÉÕ€«€ë€È¡¢ÄŸžå€Î¥Ö¥ì¡Œ¥¹Ãæ€ÎÊž€¬ŒÂ¹Ô€µ€ì¡¢žåÂ³€¹€ë elsif €È else €ÎÀá€Ï¥¹¥¥Ã¥×€µ€ì€Þ€¹¡£ €¹€Ù€Æ€Î if €ª€è€Ó elsif €ÎÀá€¬¥Á¥§¥Ã¥¯€µ€ì€¿€â€Î€Î€É€ÎŒ°€â¿¿€Ë€Ê€é€Ê€€Ÿì¹ç€Ç¡¢ else Àá€¬Âžºß€¹€ëŸì¹ç¡¢ else €ÎÄŸžå€Î¥Ö¥ì¡Œ¥¹Ãæ€ÎÊž€¬ÉŸ²Á€µ€ì€Þ€¹¡£ Ÿò·ï€Ë€ª€€€Æ€Ï¡¢ÉŸ²Á·ë²Ì€¬¶õ€Ë€Ê€ë¥Ö¡Œ¥ëŒ°€Ïµ¶€È€·€Æ°·€ï€ì€Þ€¹¡£

¥Ö¡Œ¥ëŒ°

°Ê²Œ€Ï¡¢DHCP ÇÛÉÛÊª€Çžœºß¥µ¥Ý¡Œ¥È€µ€ì€Æ€€€ë¥Ö¡Œ¥ëŒ°€Î°ìÍ÷€Ç€¹¡£

data-expression-1 = data-expression-2

= ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢2 žÄ€Î¥Ç¡Œ¥¿Œ°€òÈæ³Ó€·¡¢ÎŸŒÔ€¬Æ±€žŸì¹ç€Ï¿¿€òÊÖ€·¡¢ Æ±°ì€Ç€Ê€€Ÿì¹ç€Ïµ¶€òÊÖ€·€Þ€¹¡£ ºžÊÕ€â€·€¯€Ï±ŠÊÕ€Î€€€º€ì€«€¬¶õ€ÎŸì¹ç¡¢·ë²Ì€Ï¶õ€Ë€Ê€ê€Þ€¹¡£

boolean-expression-1 and boolean-expression-2

and ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢ºžÊÕ€Î¥Ö¡Œ¥ëŒ°€È±ŠÊÕ€Î¥Ö¡Œ¥ëŒ°€ÎÎŸÊý€ÎÉŸ²Á·ë²Ì€¬ ¿¿€ÎŸì¹ç¡¢¿¿€ÈÉŸ²Á€µ€ì€Þ€¹¡£ €œ€Š€Ç€Ê€€Ÿì¹ç¡¢µ¶€ÈÉŸ²Á€µ€ì€Þ€¹¡£ ºžÊÕ€â€·€¯€Ï±ŠÊÕ€Î€€€º€ì€«€¬¶õ€ÎŸì¹ç¡¢·ë²Ì€Ï¶õ€Ë€Ê€ê€Þ€¹¡£

boolean-expression-1 or boolean-expression-2

or ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢ºžÊÕ€Î¥Ö¡Œ¥ëŒ°€È±ŠÊÕ€Î¥Ö¡Œ¥ëŒ°€Î€€€º€ì€«€ÎÉŸ²Á·ë²Ì€¬ ¿¿€ÎŸì¹ç¡¢¿¿€ÈÉŸ²Á€µ€ì€Þ€¹¡£ €œ€Š€Ç€Ê€€Ÿì¹ç¡¢µ¶€ÈÉŸ²Á€µ€ì€Þ€¹¡£ ºžÊÕ€â€·€¯€Ï±ŠÊÕ€Î€€€º€ì€«€¬¶õ€ÎŸì¹ç¡¢·ë²Ì€Ï¶õ€Ë€Ê€ê€Þ€¹¡£

not boolean-expression

not ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢boolean-expression €ÎÉŸ²Á·ë²Ì€¬µ¶€ÎŸì¹ç¡¢ ¿¿€ÈÉŸ²Á€µ€ì€Þ€¹¡£ €Þ€¿¡¢boolean-expression €ÎÉŸ²Á·ë²Ì€¬¿¿€ÎŸì¹ç¡¢µ¶€ÈÉŸ²Á€µ€ì€Þ€¹¡£ boolean-expression €ÎÉŸ²Á·ë²Ì€¬¶õ€ÎŸì¹ç¡¢·ë²Ì€â€Þ€¿¶õ€Ë€Ê€ê€Þ€¹¡£

exists option-name

exists Œ°€Ï¡¢œèÍýÂÐŸÝ€ÎÆþÎÏ DCHP ¥Ñ¥±¥Ã¥ÈÃæ€Ë¡¢ »ØÄê€µ€ì€¿¥ª¥×¥·¥ç¥ó€¬Âžºß€¹€ëŸì¹ç¡¢¿¿€òÊÖ€·€Þ€¹¡£

known

known Œ°€Ï¡¢Í×µáÂÐ±þÃæ€Î¥¯¥é¥€¥¢¥ó¥È€¬ŽûÃÎ€ÎŸì¹ç¡¢ €¹€Ê€ï€Á¥Û¥¹¥ÈÀëžÀ€¬€¢€ëŸì¹ç¡¢¿¿€òÊÖ€·€Þ€¹¡£

static

static Œ°€Ï¡¢Í×µáÂÐ±þÃæ€Î¥¯¥é¥€¥¢¥ó¥È€Ø€Î¥ê¡Œ¥¹³ä€êÅö€Æ€¬¡¢ ÀÅÅª¥¢¥É¥ì¥¹³ä€êÅö€Æ€Ë€è€ë€â€Î€Ç€¢€Ã€¿Ÿì¹ç¡¢¿¿€òÊÖ€·€Þ€¹¡£

¥Ç¡Œ¥¿Œ°

Á°œÒ€Î¥Ö¡Œ¥ëŒ°€Ï¡¢¥Ç¡Œ¥¿Œ°€ÎÉŸ²Á·ë²Ì€Ë°ÍÂž€·€Þ€¹¡£ ¥Ç¡Œ¥¿Œ°€ò€³€³€ËŒš€·€Þ€¹¡£

substring (data-expr, offset, length)

substring ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢¥Ç¡Œ¥¿Œ°€òÉŸ²Á€·¡¢ ÉŸ²Á·ë²ÌÃæ€Î offset ¥Ð¥€¥È€«€é³«»Ï€·€Æ length ¥Ð¥€¥È·ÑÂ³€¹€ë ¥µ¥Ö¥¹¥È¥ê¥ó¥°€òÊÖ€·€Þ€¹¡£ offset €È length €Ï¶Š€Ë¿ôÃÍŒ°€Ç€¹¡£ data-expr, offset, length €Î€€€º€ì€«€¬¶õ€ÈÉŸ²Á€µ€ì€ëŸì¹ç¡¢ ·ë²Ì€â€Þ€¿¶õ€Ë€Ê€ê€Þ€¹¡£ offset €¬¡¢ÉŸ²Á€µ€ì€¿¥Ç¡Œ¥¿€ÎÄ¹€µ°ÊŸå€Ç€¢€ëŸì¹ç¡¢ Ä¹€µ 0 €Î¥Ç¡Œ¥¿Êž»úÎó€¬ÊÖ€µ€ì€Þ€¹¡£ length €¬¡¢ÉŸ²Á€µ€ì€¿¥Ç¡Œ¥¿€Î offset €è€êžå€ÎÄ¹€µ€è€êÂç€€€Ÿì¹ç¡¢ ÉŸ²Á€µ€ì€¿¥Ç¡Œ¥¿€Î offset €«€éœªÃŒ€Þ€Ç€ÎÁŽ¥Ç¡Œ¥¿€òŽÞ€à ¥Ç¡Œ¥¿Êž»úÎó€¬ÊÖ€µ€ì€Þ€¹¡£

suffix (data-expr, length)

suffix ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢data-expr €òÉŸ²Á€·¡¢ ÉŸ²Á·ë²Ì€ÎºÇžå€Î length ¥Ð¥€¥È€òÊÖ€·€Þ€¹¡£ length €Ï¿ôÃÍŒ°€Ç€¹¡£ data-expr €Þ€¿€Ï length €ÎÉŸ²Á·ë²Ì€¬¶õ€ÎŸì¹ç¡¢ ·ë²Ì€â€Þ€¿¶õ€Ë€Ê€ê€Þ€¹¡£ suffix (ÌõÃí: length €¬Àµ€·€€€È»×€ï€ì€Þ€¹) €ÎÉŸ²Á·ë²Ì€¬ÉŸ²Á€µ€ì€¿¥Ç¡Œ¥¿€ÎÄ¹€µ€è€êÂç€€€Ÿì¹ç¡¢ ÉŸ²Á€µ€ì€¿¥Ç¡Œ¥¿€¬ÊÖ€µ€ì€Þ€¹¡£

option option-name

option ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢¥µ¡Œ¥Ð€¬±þÅúœèÍýÃæ€Î¥Ñ¥±¥Ã¥È€ÎÃæ€Î¡¢ »ØÄê€·€¿¥ª¥×¥·¥ç¥ó€ÎÆâÍÆ€òÊÖ€·€Þ€¹¡£

config-option option-name

config-option ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢»ØÄê€·€¿¥ª¥×¥·¥ç¥ó€ËÂÐ€·¡¢ DHCP ¥¯¥é¥€¥¢¥ó¥È€Þ€¿€Ï¥µ¡Œ¥Ð€¬Á÷œÐ€¹€ë€è€ŠÀßÄê€µ€ì€¿ÃÍ€òÊÖ€·€Þ€¹¡£

hardware

hardware ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢¥Ç¡Œ¥¿¥¹¥È¥ê¥ó¥°€òÊÖ€·€Þ€¹¡£ ¥Ç¡Œ¥¿¥¹¥È¥ê¥ó¥°€ÎºÇœé€ÎÍ×ÁÇ€Ï¡¢ ÂÐŸÝ¥Ñ¥±¥Ã¥È€¬Œš€¹¥Í¥Ã¥È¥ï¡Œ¥¯¥€¥ó¥¿¥Õ¥§¡Œ¥¹€Î¥¿¥€¥×€Ç€¢€ê¡¢ žåÂ³€¹€ëÍ×ÁÇ€Ï¡¢¥¯¥é¥€¥¢¥ó¥È€Î¥ê¥ó¥¯ÁØ¥¢¥É¥ì¥¹€Ç€¹¡£ ¥Ñ¥±¥Ã¥È€¬Âžºß€·€Ê€€Ÿì¹ç€â€·€¯€Ï RFC2131 hlen ¥Õ¥£¡Œ¥ë¥É€¬Ìµžú€ÊŸì¹ç¡¢ ·ë²Ì€Ï¶õ€Ë€Ê€ê€Þ€¹¡£ ¥Ï¡Œ¥É¥Š¥§¥¢¥¿¥€¥×€Ë€Ï¡¢¥€¡Œ¥µ¥Í¥Ã¥È (1)¡¢¥È¡Œ¥¯¥ó¥ê¥ó¥° (6)¡¢ FDDI (8) €¬ŽÞ€Þ€ì€Þ€¹¡£ ¥Ï¡Œ¥É¥Š¥§¥¢¥¿¥€¥×€Ï IETF €Ë€è€Ã€Æµ¬Äê€µ€ì¡¢ €É€Î€è€Š€Ë¥¿¥€¥×€Î¿ôÃÍ€¬ÄêµÁ€µ€ì€ë€«€ÎŸÜºÙ€Ï RFC2131 (ISC DHCP ÇÛÉÛÊª€Ç€Ï¡¢doc/ ¥µ¥Ö¥Ç¥£¥ì¥¯¥È¥ê€Ë€¢€ê€Þ€¹) €ò»²ŸÈ€·€Æ€¯€À€µ€€¡£

packet (offset, length)

packet ¥ª¥Ú¥ì¡Œ¥¿€Ï¡¢ÂÐŸÝ¥Ñ¥±¥Ã¥È€Î»ØÄêÉôÊ¬€òÊÖ€¹€«¡¢ ÂÐŸÝ¥Ñ¥±¥Ã¥È€¬Ìµ€€ÊžÌ®€Ç€Ï¶õ€òÊÖ€·€Þ€¹¡£ offset €È length €Ï¡¢ substring ¥ª¥Ú¥ì¡Œ¥¿€ÈÆ±ÍÍ€Ë¡¢¥Ñ¥±¥Ã¥È€ÎÆâÍÆ€ËÅ¬ÍÑ€µ€ì€Þ€¹¡£

string

¥¯¥©¡Œ¥È€Ç³ç€é€ì€¿¥¹¥È¥ê¥ó¥°€Ï¥Ç¡Œ¥¿Œ°€È€·€Æ»ØÄê²ÄÇœ€Ç€¢€ê¡¢ ¥¯¥©¡Œ¥È€ÎŽÖ€ò ASCII ¥š¥ó¥³¡Œ¥É€·€¿€Î¥Æ¥¥¹¥È€òÊÖ€·€Þ€¹¡£ ¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å ('\') Êž»ú€Ï C ¥×¥í¥°¥é¥à€Î€è€Š€ËÆÃÊÌ°·€€€µ€ì€Þ€¹: €¹€Ê€ï€Á '\t' €Ï¥¿¥Ö€ò¡¢'\r' €ÏÉü²þ€ò¡¢'\n' €Ï²þ¹Ô€ò¡¢'\b' €Ï¥Ù¥ë€ò °ÕÌ£€·€Þ€¹¡£ 8 ¿Ê¿ôÃÍ€Ï '\nnn' €Ç»ØÄê²ÄÇœ€Ç€¢€ê¡¢nnn €Ï 0 °ÊŸå 0377 °Ê²Œ€Î 8 ¿Ê¿ôÃÍ€Ç€¹¡£ 16 ¿Ê¿ôÃÍ€Ï '\xnn' €Ç»ØÄê²ÄÇœ€Ç€¢€ê¡¢nn €Ï 0 °ÊŸå 0xff °Ê²Œ€Î 16 ¿Ê¿ôÃÍ€Ç€¹¡£

colon-separated hexadecimal list

¥³¥í¥ó€Ç¶èÀÚ€é€ì€¿ 16 ¿Ê¿ô€Î¥ª¥¯¥Æ¥Ã¥ÈÃÍ€Î¥ê¥¹¥È€ò¡¢ ¥Ç¡Œ¥¿Œ°€È€·€Æ»ØÄê²ÄÇœ€Ç€¹¡£

concat (data-expr1, ..., data-exprN)

Œ°€¬ÉŸ²Á€µ€ì¡¢³ÆÉŸ²Á·ë²Ì€¬¥µ¥ÖŒ°€ÎœçÈÖ€ËÏ¢·ë€µ€ì€Þ€¹¡£ ¥µ¥ÖŒ°€Î€€€º€ì€«€ÎÉŸ²Á·ë²Ì€¬¶õ€Ë€Ê€ëŸì¹ç¡¢Ï¢·ë€Î·ë²Ì€Ï¶õ€Ë€Ê€ê€Þ€¹¡£

reverse (numeric-expr1, data-expr2)

2 žÄ€ÎŒ°€¬ÉŸ²Á€µ€ì¡¢¥Ç¡Œ¥¿Œ°€ÎÉŸ²Á·ë²Ì€¬€œ€ÎŸì€ÇÈ¿ÅŸ€µ€ì€Þ€¹¡£ È¿ÅŸ€Ï¡¢¿ôÃÍŒ°€Ç»ØÄê€µ€ì€ëÂç€€µ€ÎÃ±°Ì€Ç¹Ô€ï€ì€Þ€¹¡£ Îã€š€Ð¡¢¿ôÃÍŒ°€ÎÉŸ²Á·ë²Ì€¬ 4 €ÎŸì¹ç€Ç¡¢ ¥Ç¡Œ¥¿Œ°€ÎÉŸ²Á·ë²Ì€¬ 12 ¥Ð¥€¥È€Ë€Ê€ëŸì¹ç¡¢ reverse Œ°€ÎÉŸ²Á·ë²Ì€Ï¡¢Œ¡€Î€è€Š€Ê 12 ¥Ð¥€¥È€Î¥Ç¡Œ¥¿€Ë€Ê€ê€Þ€¹¡£ €¹€Ê€ï€Á¡¢ÆþÎÏ€ÎºÇžå€Î 4 ¥Ð¥€¥È¡¢¿¿Ãæ€Î 4¥Ð¥€¥È¡¢ºÇœé€Î 4 ¥Ð¥€¥È€Î œç€Ë€Ê€ê€Þ€¹¡£

leased-address

€€€«€Ê€ëÊžÌ®€Ë€ª€€€Æ€â¡¢ Í×µáœèÍýÂÐŸÝ€È€Ê€Ã€Æ€€€ë¥¯¥é¥€¥¢¥ó¥È€Ë IP ¥¢¥É¥ì¥¹€¬³ä€êÅö€ÆºÑ€ÎŸì¹ç¡¢ €œ€Î IP ¥¢¥É¥ì¥¹€¬ÊÖ€µ€ì€Þ€¹¡£

binary-to-ascii (numeric-expr1, numeric-expr2, data-expr1, data-expr2)

data-expr2 €ÎÉŸ²Á·ë²Ì€ò¥Æ¥¥¹¥È¥¹¥È¥ê¥ó¥°€ËÊÑŽ¹€·€Þ€¹¡£ €³€Î¥Æ¥¥¹¥È¥¹¥È¥ê¥ó¥°Ãæ€Ç€Ï¡¢ data-expr2 €ÎÉŸ²Á·ë²Ì€Î³ÆÍ×ÁÇ€¬¡¢1 žÄ€Î¿ôÃÍ€Ë€Ê€ê€Þ€¹¡£ ³Æ¿ôÃÍ€Ï¡¢€œ€ì€Ÿ€ì¡¢data-expr1 €ÎÉŸ²Á·ë²Ì€Ë€è€Ã€Æ¶èÀÚ€é€ì€Þ€¹¡£ numeric-expr1 €ÎÉŸ²Á·ë²Ì€Ï¡¢Žð¿ô (2 €«€é 16) €Ç€¢€ê¡¢ €³€ÎŽð¿ô€Ë¿ôÃÍ€¬ÊÑŽ¹€µ€ì€Þ€¹¡£ numeric-expr2 €ÎÉŸ²Á·ë²Ì€Ï¡¢³Æ¿ôÃÍ€Î¥Ó¥Ã¥ÈÉý€Ç€¢€ê¡¢ 8, 16, 32 €Î€€€º€ì€«€Ç€¹¡£ ºÇœé€Î 3 žÄ€Î¥¿¥€¥×€ÎŒ°€ÎÎã€È€·€Æ¡¢ ¥¯¥é¥€¥¢¥ó¥È€Ë³ä€êÅö€Æ€é€ì€¿ IP ¥¢¥É¥ì¥¹ÍÑ€Î PTR ¥ì¥³¡Œ¥É€ÎÌŸÁ°€òÀžÀ®€¹€ë€¿€á€Ë»ÈÍÑ²ÄÇœ€ÊŒ°€òŒš€·€Þ€¹

         concat (binary-to-ascii (10, 8, ".",
                                  reverse (1, leased-address)),
                 ".in-addr.arpa.");

encode-int (numeric-expr, width)

¿ôÃÍŒ°€¬ÉŸ²Á€µ€ì¡¢»ØÄê€µ€ì€¿Éý€Î¥Ç¡Œ¥¿¥¹¥È¥ê¥ó¥°€Ë ¥Í¥Ã¥È¥ï¡Œ¥¯¥Ð¥€¥Èœç (ºÇŸå°Ì¥Ð¥€¥È€¬ºÇœé) €Ç¥š¥ó¥³¡Œ¥É€µ€ì€Þ€¹¡£ ¿ôÃÍŒ°€ÎÉŸ²Á·ë²Ì€¬¶õ€ÎÃÍ€Ë€Ê€ëŸì¹ç¡¢·ë²Ì€â€Þ€¿¶õ€Ç€¹¡£

pick-first-value (data-expr1 [ ... exprn ] )

pick-first-value ŽØ¿ô€Ï¡¢Ç€°ÕžÄ€Î¥Ç¡Œ¥¿Œ°€òŒè€êÆÀ€Þ€¹¡£ ¥ê¥¹¥È€ÎÀèÆ¬€«€é³ÆŒ°€¬ÉŸ²Á€µ€ì¡¢ ÉŸ²Á·ë²Ì€¬¶õ€Ç€Ï€Ê€€Œ°€¬ž«ÉÕ€«€ë€Þ€Ç€³€ì€¬Â³€€Þ€¹¡£ €³€ÎŒ°€¬ÊÖ€µ€ì¡¢€³€ÎŒ°€ËžåÂ³€¹€ëŒ°€ÏÉŸ²Á€µ€ì€Þ€»€ó¡£ €¹€Ù€Æ€ÎŒ°€ÎÉŸ²Á·ë²Ì€¬¶õ€ÎŸì¹ç¡¢¶õ€ÎÃÍ€¬ÊÖ€µ€ì€Þ€¹¡£

host-decl-name

host-decl-name ŽØ¿ô€Ï¡¢žœºßÍ×µáœèÍýÂÐŸÝ€È€Ê€Ã€Æ€€€ë¥¯¥é¥€¥¢¥ó¥È€Ë¥Þ¥Ã¥Á€¹€ë¡¢ ¥Û¥¹¥ÈÀëžÀ€ÎÌŸÁ°€òÊÖ€·€Þ€¹¡£ €É€Î¥Û¥¹¥ÈÀëžÀ€â¥Þ¥Ã¥Á€·€Ê€€Ÿì¹ç¡¢·ë²Ì€Ï¶õ€Ë€Ê€ê€Þ€¹¡£

¿ôÃÍŒ°

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extract-int (data-expr, width)

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