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;
       };
       The record_start field in struct ares_txt_ext is 1 if this structure is a start of  a  TXT
       record,  and 0 if the structure is a continuation of a previous record. The linked list of
       the struct ares_txt_ext will have at least one item with record_start equal to 1, and  may
       have some items with record_start equal to 0 between them.

       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)

AUTHOR

       Written   by   Jakub   Hrozek   <jhrozek@redhat.com>,   on   behalf   of   Red   Hat,  Inc
       http://www.redhat.com

       Amended   by   Fedor   Indutny   <fedor@indutny.com>,   on   behalf   of    PayPal,    Inc
       https://www.paypal.com

                                         27 October 2009                  ARES_PARSE_TXT_REPLY(3)