ares_expand_name - Expand a DNS-encoded domain name


#include <ares.h>
int ares_expand_name(const unsigned char *encoded,
                     const unsigned char *abuf, int alen,
                     char **s, long *enclen)


The ares_expand_name function converts a DNS-encoded domain name to a dot-separated C string. The argument encoded gives the beginning of the encoded domain name, and the arguments abuf and alen give the containing message buffer (necessary for the processing of indirection pointers within the encoded domain name). The result is placed in a NUL-terminated allocated buffer, a pointer to which is stored in the variable pointed to by s. The length of the encoded name is stored in the variable pointed to by enclen so that the caller can advance past the encoded domain name to read further data in the message.

Use ares_free_string to free the allocated hostname.

Return values

ares_expand_name can return any of the following values:

ARES_SUCCESS Expansion of the encoded name succeeded.

ARES_EBADNAME The encoded domain name was malformed and could not be expanded.

ARES_ENOMEM Memory was exhausted.

See also

ares_mkquery(3), ares_free_string(3)


Greg Hudson, MIT Information Systems
Copyright 1998 by the Massachusetts Institute of Technology.

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