Blocking ports and reseting conections

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LEARN ABOUT REDHAT

lwres_getnameinfo

LWRES_GETNAMEINFO(3)													      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); .SH
       "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.

BIND9								   Jun 30, 2000 					      LWRES_GETNAMEINFO(3)

SCO