ARES_PARSE_TXT_REPLY - Online Linux Manual PageSection : 3
Updated : 27 October 2009
NAMEares_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);
DESCRIPTIONThe ares_parse_txt_reply (ares_parse_txt_reply_ext) function parses 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 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 VALUESares_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.
AVAILABILITYThis function was first introduced in c-ares version 1.7.0.
SEE ALSOares_query(3) ares_free_data(3)
AUTHORWritten 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 0
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