dn_skipname()--Skip over Compressed Domain Name

 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <resolv.h>

 int dn_skipname(unsigned char *compressed_domain_name,
                 unsigned char *end_of_message)

The dn_skipname() function is used to skip over a compressed domain name in a DNS packet.

Authorities and Locks

None.

Parameters

compressed_domain_name

(Input) A pointer to a compressed domain name.

end_of_message

(Input) The pointer to the end of the message string.

Return Value

dn_skipname() returns an integer. Possible values are:

• -1 (unsuccessful)
  
  
• n (successful), where n is the size of compressed_domain_name.

Error Conditions

When the dn_skipname() function fails, it does not set specific errno or h_errno values. An error occurs under the following conditions:

• NULL pointer(s) passed to the function.
  
  
• Invalid pointer(s) passed to the function.
  
  
• end_of_message reached before the end of the compressed domain name.

Usage Notes

1. dn_skipname() skips over a compressed domain name in a DNS packet and returns the size of compressed_domain_name.
   
   
2. dn_skipname() expects EBCDIC data as input.

Related Information

• dn_expand()--Expand Domain Name
  
  
• dn_find()--Search for Compressed Domain Name
  
  
• dn_comp()--Compress Domain Name