SRV(2) SRV(2)
NAME
srv, ipsrv - network name and address translation
SYNOPSIS
include "srv.m"
srv:= load Srv Srv->PATH;
Srv: module
{
PATH: con "$Srv";
iph2a: fn(host: string): list of string;
ipa2h: fn(addr: string): list of string;
ipn2p: fn(protocol, service: string): string;
};
ipsrv := load Ipsrv Ipsrv->PATH;
Ipsrv: module
{
init: fn(nil: list of string);
iph2a: fn(host: string): list of string;
ipa2h: fn(addr: string): list of string;
ipn2p: fn(protocol, service: string): string;
};
DESCRIPTION
These modules provide name and address translation in hosted
and native modes.
Srv is a module built in to emu(1) that accesses the Inter-
net name resolution services of a host operating system.
Given a host name, Iph2a returns a list of its Internet
addresses (if any). Given an Internet address, ipa2h
returns a list of host names (if any) that have that
address. The results are only as accurate as the host
system's name service.
Ipn2p returns the port number (as a string) for the given
service when accessed using a particular protocol protocol
(typically tcp or udp).
Ipsrv provides a superset of the srv(2) interface for name
and address translation. It can be used in both hosted and
native modes. It has an additional init function that must
be called before any of the other functions is used; its
argument should be nil. It uses the Internet Domain Name
Service (DNS) for both host name lookup and reverse
(address) lookup. The addresses of the DNS servers, which
must be numeric IP addresses, and an (optional) local domain
name are read from /services/dns/db. It uses services(6) to
map protocol and service names to Internet port numbers.
SRV(2) SRV(2)
SOURCE
/appl/lib/ipsrv.b
SEE ALSO
sys-file2chan(2), cs(8)
BUGS
Srv should have an init function. On the other hand, Ipsrv
should not take arguments to its init function.
Ipsrv uses TCP/IP not UDP/IP to access the DNS.