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added more documentation

This commit is contained in:
cresh 2002-06-25 09:11:45 +00:00
parent 0d70f66dd7
commit 57915d3e16
1 changed files with 38 additions and 8 deletions
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scheme/lib/dns.scm
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@ -11,25 +11,55 @@
; - types from newer RFCs (41, unknown)
; - more documentation
;
; ---
; sample usage & documentation:
;
; sample usage:
; <name>, <ip-string> and <nameserver> are strings.
;
; (dns-lookup-name <name> [nameserver]) --> <ip>
; (dns-lookup-ip <ip> [nameserver]) --> <name>
; (dns-lookup-nameserver <name> [nameserver]) --> <list of ips of authoritative nameservers>
; (dns-lookup-mail-exchanger <name> [nameserver]) --> <list of names of mail-exchangers>
; <nameserver> can either be a domainname or a ip.
; if it is a domainname, its ip is looked up on a nameserver listed in
; /etc/resolv.conf.
;
; (dns-lookup <name/ip> <type> [nameserver]) --> <dns-message>
; (dns-find-nameserver) --> <ip-string>
; this parses the /etc/resolv.conf file and returns the first found
; nameserver.
;
;
;
; (dns-lookup-name <name> [nameserver]) --> <ip-string>
; (dns-lookup-ip <ip-string> [nameserver]) --> <name>
; (dns-lookup-nameserver <name> [nameserver])
; --> <list of ip-strings of authoritative nameservers>
; (dns-lookup-mail-exchanger <name> [nameserver])
; --> <list of names of mail-exchangers>
;
; dns-lookup-name, dns-lookup-ip, dns-lookup-nameserver and
; dns-lookup-mail-exchanger are "simple lookup functions",
; they return the wanted information or #f.
;
;
; (dns-lookup <name/ip-string> <type> [nameserver]) --> <dns-message>
; (show-dns-message <dns-message) --> the whole message, human readable
;
; (concurrent-lookup <dns-lookup-*> <name>)
; a <dns-message> is a record, with several entries, which holds the whole
; query/response dialog. the simplest way to get detailed information about
; the record structure is to view the result of show-dns-message.
;
; dns-lookup returns much more information than the simple lookup functions,
; only useful in very special cases.
;
;
; (concurrent-lookup <simple lookup function> <name>)
; starts a concurrent lookup to all nameservers in /etc/resolv.conf.
; the simple lookup function defines the lookup type.
;
;
; some lookups return a hostname (e.g. mx).
; many applications need instead of a hostname a ip address.
; force-ip and force-ip-list guarantee that a ip address is
; returned.
;
; (force-ip <name>) --> <ip>
; (force-ip <name>) --> <ip-string>
; (force-ip-list <list of names>) --> <list of ips>