07-02-2012
Thank you for your answers
You mean:
I assign to the server a hostname (for example : serv) and the client get the @ip of the server by get-host-by-name (serv) ?
Thank you
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LEARN ABOUT CENTOS
lwres_getnameinfo
LWRES_GETNAMEINFO(3) BIND9 LWRES_GETNAMEINFO(3)
NAME
lwres_getnameinfo - lightweight resolver socket address structure to hostname and service name
SYNOPSIS
#include <lwres/netdb.h>
int lwres_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags);
DESCRIPTION
This function is equivalent to the getnameinfo(3) function defined in RFC2133. lwres_getnameinfo() returns the hostname for the struct
sockaddr sa which is salen bytes long. The hostname is of length hostlen and is returned via *host. The maximum length of the hostname is
1025 bytes: NI_MAXHOST.
The name of the service associated with the port number in sa is returned in *serv. It is servlen bytes long. The maximum length of the
service name is NI_MAXSERV - 32 bytes.
The flags argument sets the following bits:
NI_NOFQDN
A fully qualified domain name is not required for local hosts. The local part of the fully qualified domain name is returned instead.
NI_NUMERICHOST
Return the address in numeric form, as if calling inet_ntop(), instead of a host name.
NI_NAMEREQD
A name is required. If the hostname cannot be found in the DNS and this flag is set, a non-zero error code is returned. If the hostname
is not found and the flag is not set, the address is returned in numeric form.
NI_NUMERICSERV
The service name is returned as a digit string representing the port number.
NI_DGRAM
Specifies that the service being looked up is a datagram service, and causes getservbyport() to be called with a second argument of
"udp" instead of its default of "tcp". This is required for the few ports (512-514) that have different services for UDP and TCP.
RETURN VALUES
lwres_getnameinfo() returns 0 on success or a non-zero error code if an error occurs.
SEE ALSO
RFC2133(), getservbyport(3), lwres(3), lwres_getnameinfo(3), lwres_getnamebyaddr(3). lwres_net_ntop(3).
BUGS
RFC2133 fails to define what the nonzero return values of getnameinfo(3) are.
COPYRIGHT
Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
Copyright (C) 2000, 2001 Internet Software Consortium.
BIND9 Jun 30, 2000 LWRES_GETNAMEINFO(3)