NAME

ares_parse_txt_reply - Parse a reply to a DNS query of type TXT

SYNOPSIS

#include <ares.h>
int ares_parse_txt_reply(const unsigned char* abuf, int alen,


                         struct ares_txt_reply **txt_out);
int ares_parse_txt_reply_ext(const unsigned char* abuf, int alen,


                             struct ares_txt_ext **txt_out);

DESCRIPTION

The ares_parse_txt_reply(3) and ares_parse_txt_reply_ext(3) functions parse the response to a query of type TXT into a linked list (one element per sub-string) of struct ares_txt_reply (struct ares_txt_ext) The parameters abuf and alen give the contents of the response. The result is stored in allocated memory and a pointer to it stored into the variable pointed to by txt_out. It is the caller's responsibility to free the resulting txt_out structure when it is no longer needed using the function ares_free_data(3).

The structure ares_txt_reply contains the following fields:

struct ares_txt_reply {


  struct ares_txt_reply  *next;


  unsigned int  length;


  unsigned char *txt;
};

The structure ares_txt_ext contains the following fields:

struct ares_txt_ext {


  struct ares_txt_ext  *next;


  unsigned int  length;


  unsigned char *txt;


  unsigned char record_start;
};

These sequences of struct ares_txt_ext (starting from the item with record_start equal to 1, and ending right before the record start item) may be treated as either components of a single TXT record or as a multi-parted TXT record, depending on particular use case.

RETURN VALUES

ares_parse_txt_reply (ares_parse_txt_reply_ext) can return any of the following values:

ARES_SUCCESS

The response was successfully parsed.

ARES_EBADRESP

The response was malformatted.

ARES_ENODATA

The response did not contain an answer to the query.

ARES_ENOMEM

Memory was exhausted.

AVAILABILITY

This function was first introduced in c-ares version 1.7.0.

SEE ALSO

ares_query(3) ares_free_data(3)