lwres_addr_parse man page on FreeBSD

Man page or keyword search:  
man Server   9747 pages
apropos Keyword Search (all sections)
Output format
FreeBSD logo
[printable version]


       lwres_string_parse, lwres_addr_parse, lwres_getaddrsbyname,
       lwres_getnamebyaddr - lightweight resolver utility functions

       #include <lwres/lwres.h>

       lwres_result_t lwres_string_parse(lwres_buffer_t *b, char **c,
					 lwres_uint16_t *len);

       lwres_result_t lwres_addr_parse(lwres_buffer_t *b, lwres_addr_t *addr);

       lwres_result_t lwres_getaddrsbyname(lwres_context_t *ctx,
					   const char *name,
					   lwres_uint32_t addrtypes,
					   lwres_gabnresponse_t **structp);

       lwres_result_t lwres_getnamebyaddr(lwres_context_t *ctx,
					  lwres_uint32_t addrtype,
					  lwres_uint16_t addrlen,
					  const unsigned char *addr,
					  lwres_gnbaresponse_t **structp);

       lwres_string_parse() retrieves a DNS-encoded string starting the
       current pointer of lightweight resolver buffer b: i.e.  b->current.
       When the function returns, the address of the first byte of the encoded
       string is returned via *c and the length of that string is given by
       *len. The buffer's current pointer is advanced to point at the
       character following the string length, the encoded string, and the
       trailing NULL character.

       lwres_addr_parse() extracts an address from the buffer b. The buffer's
       current pointer b->current is presumed to point at an encoded address:
       the address preceded by a 32-bit protocol family identifier and a
       16-bit length field. The encoded address is copied to addr->address and
       addr->length indicates the size in bytes of the address that was
       copied.	b->current is advanced to point at the next byte of available
       data in the buffer following the encoded address.

       lwres_getaddrsbyname() and lwres_getnamebyaddr() use the
       lwres_gnbaresponse_t structure defined below:

	   typedef struct {
		   lwres_uint32_t	   flags;
		   lwres_uint16_t	   naliases;
		   lwres_uint16_t	   naddrs;
		   char			  *realname;
		   char			 **aliases;
		   lwres_uint16_t	   realnamelen;
		   lwres_uint16_t	  *aliaslen;
		   lwres_addrlist_t	   addrs;
		   void			  *base;
		   size_t		   baselen;
	   } lwres_gabnresponse_t;

       The contents of this structure are not manipulated directly but they
       are controlled through the lwres_gabn(3) functions.

       The lightweight resolver uses lwres_getaddrsbyname() to perform foward
       lookups. Hostname name is looked up using the resolver context ctx for
       memory allocation.  addrtypes is a bitmask indicating which type of
       addresses are to be looked up. Current values for this bitmask are
       LWRES_ADDRTYPE_V4 for IPv4 addresses and LWRES_ADDRTYPE_V6 for IPv6
       addresses. Results of the lookup are returned in *structp.

       lwres_getnamebyaddr() performs reverse lookups. Resolver context ctx is
       used for memory allocation. The address type is indicated by addrtype:
       LWRES_ADDRTYPE_V4 or LWRES_ADDRTYPE_V6. The address to be looked up is
       given by addr and its length is addrlen bytes. The result of the
       function call is made available through *structp.

       Successful calls to lwres_string_parse() and lwres_addr_parse() return
       LWRES_R_SUCCESS.	 Both functions return LWRES_R_FAILURE if the buffer
       is corrupt or LWRES_R_UNEXPECTEDEND if the buffer has less space than
       expected for the components of the encoded string or address.

       lwres_getaddrsbyname() returns LWRES_R_SUCCESS on success and it
       returns LWRES_R_NOTFOUND if the hostname name could not be found.

       LWRES_R_SUCCESS is returned by a successful call to

       Both lwres_getaddrsbyname() and lwres_getnamebyaddr() return
       LWRES_R_NOMEMORY when memory allocation requests fail and
       LWRES_R_UNEXPECTEDEND if the buffers used for sending queries and
       receiving replies are too small.

       lwres_buffer(3), lwres_gabn(3).

       Copyright © 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
       Copyright © 2000, 2001 Internet Software Consortium.

BIND9				 Jun 30, 2000		      LWRES_RESUTIL(3)

List of man pages available for FreeBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net