expand a compressed Internet domain name
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
int dn_expand( const u_char *msg,
const u_char *eomorig,
const u_char *comp_dn,
u_char *exp_dn,
int length );
The dn_expand() function is a low-level routine used by res_query() to expand the compressed domain name, comp_dn, to a full domain name.
The compressed name is contained in a query or reply message; msg is a pointer to the beginning of the message. The eomorig argument is a pointer to the first location after the message.
The uncompressed name is placed in the buffer indicated by exp_dn; the size of the buffer is specified by length.
The size of the compressed domain name, in bytes, or -1 if an error occurred.
UNIX
| Safety: | |
|---|---|
| Interrupt handler | No |
| Signal handler | No |
| Thread | Yes |
dn_comp(), gethostbyname(), res_init() res_mkquery(), res_query(), res_search(), res_send()
/etc/resolv.conf, hostname, named in the TCP/IP User's Guide
RFC 1032, RFC 1033, RFC 1034, RFC 1035, RFC 974