ns_addr(3aolserver) AOLserver Built-In Commands ns_addr(3aolserver)__________________________________________________________________________________________________________________________________________________NAME
ns_addrbyhost, ns_hostbyaddr - Domain Name Service routines.
SYNOPSIS
ns_addrbyhost address
ns_hostbyaddr hostname
_________________________________________________________________DESCRIPTION
These commands utilize the platforms name resolution routines which normally access the Domain Name Service (DNS) to translate IP addresses
into fully qualified hostnames and vice versa.
ns_addrbyhost address
Returns the fully qualified domain name for given IP address expressed in dotted decimal format (e.g., 72.14.207.99).
ns_hostbyaddr Ihostname
Returns the dotted decimal address for a partial or fully qualified domain name (e.g., google.com).
KEYWORDS
DNS, hostname, address
AOLserver 4.0 ns_addr(3aolserver)
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NS(3N)NS(3N)NAME
ns_addr, ns_ntoa - Xerox NS(tm) address conversion routines
SYNOPSIS
#include <sys/types.h>
#include <netns/ns.h>
struct ns_addr ns_addr(cp)
char *cp;
char *ns_ntoa(ns)
struct ns_addr ns;
DESCRIPTION
The routine ns_addr interprets character strings representing XNS addresses, returning binary information suitable for use in system calls.
ns_ntoa takes XNS addresses and returns ASCII strings representing the address in a notation in common use in the Xerox Development Envi-
ronment:
<network number>.<host number>.<port number>
Trailing zero fields are suppressed, and each number is printed in hexadecimal, in a format suitable for input to ns_addr. Any fields
lacking super-decimal digits will have a trailing ``H'' appended.
Unfortunately, no universal standard exists for representing XNS addresses. An effort has been made to insure that ns_addr be compatible
with most formats in common use. It will first separate an address into 1 to 3 fields using a single delimiter chosen from period (``.''),
colon (``:'') or pound-sign (``#''). Each field is then examined for byte separators (colon or period). If there are byte separators,
each subfield separated is taken to be a small hexadecimal number, and the entirety is taken as a network-byte-ordered quantity to be zero
extended in the high-network-order bytes. Next, the field is inspected for hyphens, in which case the field is assumed to be a number in
decimal notation with hyphens separating the millenia. Next, the field is assumed to be a number: It is interpreted as hexadecimal if
there is a leading ``0x'' (as in C), a trailing ``H'' (as in Mesa), or there are any super-decimal digits present. It is interpreted as
octal is there is a leading ``0'' and there are no super-octal digits. Otherwise, it is converted as a decimal number.
SEE ALSO hosts(5), networks(5),
DIAGNOSTICS
None (see BUGS).
BUGS
The string returned by ns_ntoa resides in a static memory area.
ns_addr should diagnose improperly formed input, and there should be an unambiguous way to recognize this.
4.3 Berkeley Distribution May 12, 1986 NS(3N)
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