̾??

Internet Systems Consortium ?? DHCP ???饤?????Ȥȥ????Фϡ??ɤ????? ?????????ѥ??åȤ˰?¸?????????դ?ư?????Ԥ?ǽ?Ϥ??????ޤ??? ?????դ?ư????ʸˡ?򤳤??˼????ޤ???

?????դ?ư???ϡ?if, else, elsif ʸ?????Ѥ??ƻ??ꤷ?ޤ??? ????ʸ?ϡ??̾?ʸ (option ʸ) ???о???ǽ?ʾ????Ϥɤ??ˤǤ??о???ǽ?Ǥ??ꡢ ?ޤ????Τ褦??ʸ?????뤳?Ȥ???ǽ?Ǥ??? ?????Фˤ?????????ʸ?ϼ??Τ褦?ˤʤ뤳?Ȥ?¿???Ǥ??礦:

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;
}

???饤??????¦?Ǥϡ??????դ?ɾ???????ϼ??Τ褦?ˤʤ??Ǥ??礦:

# example.org ?ϥե????䥦???????? DNS ???ե??륿?????Τǡ?
# example.org ?ͥåȥ???˷Ҥ????Ȥ??Τߡ????? DNS ?????Ф????Ѥ??ޤ???
# example.org ?˷Ҥ????ΤǤϤʤ????硢???ʤ? DNS ?????Ф?ͥ?????Ѥ??ޤ???
if not option domain-name = "example.org" {
  prepend domain-name-servers 127.0.0.1;
}

if ʸ?? elsif ??³ʸ?ϡ??????Ȥ??ƥ֡??뼰???????ޤ??? ?Ĥޤꡢ????????ʸ?ϡ?ɾ?????????ȥ֡????ͤη??̤????????뼰???????ޤ??? ????ɾ?????̤????ˤʤ??ȡ? if ʸ??ľ???Υ֥졼???dz????줿ʸ???¹Ԥ??졢??³???? elsif ?? else ?????ϥ????åפ????ޤ??? ?????Ǥʤ????硢ɾ?????̤????ˤʤ? elsif ???˽в񤦤ޤǡ???³?????? elsif ???μ????????å??????ޤ??? ???Τ褦???᤬???դ????ȡ?ľ???Υ֥졼??????ʸ???¹Ԥ??졢??³???? elsif ?? else ?????ϥ????åפ????ޤ??? ???٤Ƥ? if ?????? elsif ???᤬?????å????줿???ΤΤɤμ??⿿?ˤʤ??ʤ??????ǡ? else ?᤬¸?ߤ??????硢 else ??ľ???Υ֥졼??????ʸ??ɾ???????ޤ??? ?????ˤ????Ƥϡ?ɾ?????̤????ˤʤ??֡??뼰?ϵ??Ȥ??ư??????ޤ???

?ʲ??ϡ?DHCP ????ʪ?Ǹ??ߥ??ݡ??Ȥ????Ƥ????֡??뼰?ΰ????Ǥ???

data-expression-1 = data-expression-2

boolean-expression-1 and boolean-expression-2

boolean-expression-1 or boolean-expression-2

not boolean-expression

exists option-name

???ҤΥ֡??뼰?ϡ??ǡ???????ɾ?????̤˰?¸???ޤ??? ?ǡ??????򤳤??˼????ޤ???

substring (data-expr, offset, length)

suffix (data-expr, length)

option option-name

config-option option-name

hardware

packet (offset, length)

string

colon-separated hexadecimal list

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

reverse (numeric-expr1, data-expr2)

leased-address

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

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

encode-int (numeric-expr, width)

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

host-decl-name

???ͼ??ϡ?ɾ?????̤??????ˤʤ뼰?Ǥ??? ???̤ˡ??????κ??祵?????? 32 ?ӥå?̤???Ǥ????Ȳ??ꤹ?٤??ǤϤ????ޤ??󤬡? ?????????٤? 32 ?ӥåȤ??ۤ??뤳?ȤϤ??????ޤ???

extract-int (data-expr, width)

lease-time

number

client-state

????ʸ?????Ѥ??ơ?ɸ???????????ͥ??˾???????????ǽ?Ǥ??? ????ʸ?ϡ???ά??ǽ?? priority (fatal, error, info, debug ?Τ????줫) ?ȡ? ?ǡ????????????ޤ???

log (priority, data-expr)

????ʸ?ϡ?ñ???Υǡ??????????Τ߼????ޤ??? ʣ???Υǡ????ͤ????Ϥ????????硢 concat ???ڥ졼???????Ѥ??Ƥ???????Ϣ?뤹??ɬ?פ??????ޤ???

DHCP ???饤?????Ȥȥ????Фϡ? ưŪ?˥ɥᥤ???͡??ॷ???ƥ??򹹿?????ǽ?Ϥ??????ޤ??? ?????ե????????ˡ??ɤΤ褦?˥ɥᥤ???͡??ॷ???ƥ??򹹿??????ߤ??????? ??????ǽ?Ǥ??? ?????? RFC 2136 ?˽??äƤ??뤿?ᡢ RFC 2136 ?򥵥ݡ??Ȥ??? DNS ?????Фϡ? DHCP ?????Ф????ι??????????դ???ǽ?Ȼפ????ޤ???

TSIG ?????? DNSSEC ?Ϥޤ????ݡ??Ȥ????Ƥ??ޤ????? DHCP ?????Фޤ??ϥ??饤?????Ȥ????ι??????????դ????褦?? DNS ?????Ф????ꤹ?????硢???¤?̵?????????Ф??? DNS ?????Ф򻯤????Ȥˤʤ뤫?⤷???ޤ????? ???????򤱤뤿???˺??????Ǥ??????ɤ???ˡ?ϡ? IP ???ɥ쥹?١????Υѥ??åȥե??륿?????Ѥ??ơ? ???¤?̵???ۥ??Ȥ????ι????׵?ȯ?Ԥ??޻ߤ??뤳?ȤǤ??? ???餫?ˡ??????Ǥϥ??饤?????Ȥι??????Ф??륻???????ƥ????󶡤?????ˡ?? ?????ޤ????? ???Τ????ˤ? TSIG ?? DNSSEC ??ɬ?פǤ????? ???? DHCP ????ʪ?ˤϤޤ??ޤޤ??Ƥ??ޤ?????

ưŪ DNS (DDNS) ?????ϡ?dns-update ???????Ѥ??뤳?ȤǼ¹Ԥ????ޤ??? dns-update ???ϡ??֡??뼰?Ǥ??ꡢ4 ?ĤΥѥ??᡼?????????ޤ??? ???????????????ȡ????̤Ͽ??ˤʤ??ޤ??? ???Ԥ????ȡ????̤ϵ??ˤʤ??ޤ??? 4 ?ĤΥѥ??᡼???ϡ??꥽?????쥳???ɥ????? (RR)?? RR ?κ??ա?RR ?α??ա??쥳???ɤ?Ŭ?Ѥ??????٤? ttl ?Ǥ??? ???δؿ??κǤ???ñ?ʻ??????ϡ?dhcpd.conf ?ե??????λ??????ˤ??ꡢ ?ʤˤ??????뤫???Ҥ????Ƥ??ޤ??? ???????Ǥϡ?ʣ???μ??????Ѥ????ơ? dns-update ?Ѥΰ??????????????Ƥ??ޤ???

???????Ǥϡ??ǽ??? dns-update ???ؤ? 1 ???ܤΰ????ϡ? A RR ?????פ?ɾ?????????ǡ??????Ǥ??? 2 ???ܤΰ????ϡ?DHCP host-name ???ץ??????? ?????????ɥᥤ?󡢤??ξ??? "ssd.example.net"?? ???ޤ??ƥ????ȥ??ȥ??󥰤?Ϣ?뤹?뤳?Ȥǡ????ۤ????ޤ??? 3 ???ܤΰ????ϡ????饤?????Ȥ˳??????Ƥ??줿???ɥ쥹???? 32 ?ӥåȤο??ͤ????ƥХ??Ȥ? "." ?Ƕ??ڤä? ASCII ʸ???????Ѵ????뤳?Ȥǡ? ???ۤ????ޤ??? 4 ???ܤΰ??? TTL ?ϡ??꡼???λĤ????֤Ǥ? (???????????????????????ޤ????? ?ʤ??ʤ? DNS ?????Фϡ??׵????Ф??Ƥ??Ĥ⤳?? TTL ?ͤ????Ϥ??Ƥ??ޤ??????Ǥ??? ?????ϡ??꡼???????ڤ??ο??????Ǥ??äƤ??Ǥ?)??

?ǽ??? dns-update ʸ???????????ȡ? ????³???? 2 ???ܤι????ˤ??? PTR RR ?????󥹥ȡ??뤵???ޤ??? PTR ?쥳???ɤΥ??󥹥ȡ????ϡ?A RR ?Υ??󥹥ȡ?????Ʊ?ͤǤ????? ?쥳???ɤκ??դϥ꡼?????줿???ɥ쥹???դˤ??? ".in-addr.arpa" ?? ???礵?줿???ΤǤ??? ???դϡ????ɥ쥹?Υ꡼???????襯?饤?????ȤΡ??????ʷ??ǤΥɥᥤ??̾?Ǥ???

dhcpd.conf(5), dhcpd.leases(5), dhclient.conf(5), dhcp-eval(5), dhcpd(8), dhclient(8), RFC2132, RFC2131

Internet Systems Consortium DHCP Distribution ?ϡ?Vixie Labs ?Ȥη????Τ??Ȥǡ?Ted Lemon ?????Ҥ??ޤ????? ?ܥץ????????Ȥλ????ϡ?Internet Systems Consortium ???󶡤??ޤ????? Internet Systems Consortium ?˴ؤ????????ϡ? https://www.isc.org ?ˤ????ޤ???