mirror of https://github.com/c-ares/c-ares.git
Add support for URI(Uniform Resource Identifier) records. (#411)
Add ares_parse_uri_reply() for parsing URI DNS replies. Fix By: Martin Holeš (@martin-256)pull/414/head
Martin Holeš
3 years ago
committed by
GitHub
parent
ccebec8303
commit
9ac7efc382
16 changed files with 647 additions and 7 deletions
@ -0,0 +1,81 @@ |
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.\" |
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.\" Copyright 1998 by the Massachusetts Institute of Technology. |
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.\" |
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.\" Permission to use, copy, modify, and distribute this |
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.\" software and its documentation for any purpose and without |
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.\" fee is hereby granted, provided that the above copyright |
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.\" notice appear in all copies and that both that copyright |
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.\" notice and this permission notice appear in supporting |
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.\" documentation, and that the name of M.I.T. not be used in |
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.\" advertising or publicity pertaining to distribution of the |
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.\" software without specific, written prior permission. |
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.\" M.I.T. makes no representations about the suitability of |
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.\" this software for any purpose. It is provided "as is" |
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.\" without express or implied warranty. |
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.\" |
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.TH ARES_PARSE_URI_REPLY 3 "14 August 2020" |
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.SH NAME |
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ares_parse_uri_reply \- Parse a reply to a DNS query of type URI |
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.SH SYNOPSIS |
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.nf |
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.B #include <ares.h> |
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.PP |
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.B int ares_parse_uri_reply(const unsigned char* \fIabuf\fP, int \fIalen\fP, |
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.B struct ares_uri_reply** \fIuri_out\fP); |
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.fi |
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.SH DESCRIPTION |
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The |
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.B ares_parse_uri_reply |
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function parses the response to a query of type URI into a |
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linked list of |
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.I struct ares_uri_reply |
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The parameters |
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.I abuf |
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and |
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.I alen |
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give the contents of the response. The result is stored in allocated |
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memory and a pointer to it stored into the variable pointed to by |
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.IR uri_out . |
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It is the caller's responsibility to free the resulting |
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.IR uri_out |
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structure when it is no longer needed using the function |
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.B ares_free_data |
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.PP |
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The structure |
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.I ares_uri_reply |
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contains the following fields: |
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.sp |
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.in +4n |
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.nf |
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struct ares_uri_reply { |
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struct ares_uri_reply *next; |
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unsigned short weight; |
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unsigned short priority; |
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char *uri; |
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int ttl; |
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}; |
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.fi |
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.in |
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.PP |
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.SH RETURN VALUES |
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.B ares_parse_uri_reply |
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can return any of the following values: |
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.TP 15 |
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.B ARES_SUCCESS |
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The response was successfully parsed. |
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.TP 15 |
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.B ARES_EBADRESP |
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The response was malformatted. |
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.TP 15 |
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.B ARES_ENODATA |
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The response did not contain an answer to the query. |
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.TP 15 |
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.B ARES_ENOMEM |
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Memory was exhausted. |
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.SH AVAILABILITY |
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|
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.SH SEE ALSO |
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.BR ares_query (3) |
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.BR ares_free_data (3) |
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.SH AUTHOR |
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Written by Jan Petrasek <petrasek@tes.eu> |
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@ -0,0 +1,184 @@ |
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|
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/* Copyright 1998 by the Massachusetts Institute of Technology.
|
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* Copyright (C) 2009 by Jakub Hrozek <jhrozek@redhat.com> |
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* |
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* Permission to use, copy, modify, and distribute this |
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* software and its documentation for any purpose and without |
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* fee is hereby granted, provided that the above copyright |
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* notice appear in all copies and that both that copyright |
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* notice and this permission notice appear in supporting |
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* documentation, and that the name of M.I.T. not be used in |
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* advertising or publicity pertaining to distribution of the |
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* software without specific, written prior permission. |
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* M.I.T. makes no representations about the suitability of |
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* this software for any purpose. It is provided "as is" |
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* without express or implied warranty. |
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*/ |
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|
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#include "ares_setup.h" |
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|
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#ifdef HAVE_NETINET_IN_H |
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# include <netinet/in.h> |
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#endif |
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#ifdef HAVE_NETDB_H |
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# include <netdb.h> |
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#endif |
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#ifdef HAVE_ARPA_INET_H |
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# include <arpa/inet.h> |
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#endif |
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|
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#include "ares_nameser.h" |
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|
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#include "ares.h" |
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#include "ares_dns.h" |
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#include "ares_data.h" |
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#include "ares_private.h" |
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|
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/* AIX portability check */ |
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#ifndef T_URI |
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# define T_URI 256 /* uri selection */ |
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#endif |
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|
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int |
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ares_parse_uri_reply (const unsigned char *abuf, int alen, |
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struct ares_uri_reply **uri_out) |
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{ |
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unsigned int qdcount, ancount, i; |
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const unsigned char *aptr, *vptr; |
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int status, rr_type, rr_class, rr_len, rr_ttl; |
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long len; |
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char *uri_str = NULL, *rr_name = NULL; |
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struct ares_uri_reply *uri_head = NULL; |
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struct ares_uri_reply *uri_last = NULL; |
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struct ares_uri_reply *uri_curr; |
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|
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/* Set *uri_out to NULL for all failure cases. */ |
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*uri_out = NULL; |
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|
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/* Give up if abuf doesn't have room for a header. */ |
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if (alen < HFIXEDSZ){ |
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return ARES_EBADRESP; |
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} |
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|
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/* Fetch the question and answer count from the header. */ |
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qdcount = DNS_HEADER_QDCOUNT (abuf); |
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ancount = DNS_HEADER_ANCOUNT (abuf); |
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if (qdcount != 1) { |
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return ARES_EBADRESP; |
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} |
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if (ancount == 0) { |
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return ARES_ENODATA; |
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} |
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/* Expand the name from the question, and skip past the question. */ |
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aptr = abuf + HFIXEDSZ; |
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|
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status = ares_expand_name (aptr, abuf, alen, &uri_str, &len); |
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if (status != ARES_SUCCESS){ |
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return status; |
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} |
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if (aptr + len + QFIXEDSZ > abuf + alen) |
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{ |
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ares_free (uri_str); |
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return ARES_EBADRESP; |
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} |
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aptr += len + QFIXEDSZ; |
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|
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/* Examine each answer resource record (RR) in turn. */ |
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for (i = 0; i < ancount; i++) |
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{ |
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/* Decode the RR up to the data field. */ |
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status = ares_expand_name (aptr, abuf, alen, &rr_name, &len); |
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if (status != ARES_SUCCESS) |
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{ |
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break; |
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} |
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aptr += len; |
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if (aptr + RRFIXEDSZ > abuf + alen) |
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{ |
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status = ARES_EBADRESP; |
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break; |
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} |
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|
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rr_type = DNS_RR_TYPE (aptr); |
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rr_class = DNS_RR_CLASS (aptr); |
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rr_ttl = DNS_RR_TTL(aptr); |
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rr_len = DNS_RR_LEN (aptr); |
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aptr += RRFIXEDSZ; |
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if (aptr + rr_len > abuf + alen) |
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{ |
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status = ARES_EBADRESP; |
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break; |
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} |
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|
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/* Check if we are really looking at a URI record */ |
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if (rr_class == C_IN && rr_type == T_URI) |
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{ |
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/* parse the URI record itself */ |
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if (rr_len < 5) |
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{ |
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status = ARES_EBADRESP; |
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break; |
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} |
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/* Allocate storage for this URI answer appending it to the list */ |
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uri_curr = ares_malloc_data(ARES_DATATYPE_URI_REPLY); |
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if (!uri_curr) |
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{ |
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status = ARES_ENOMEM; |
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break; |
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} |
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if (uri_last) |
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{ |
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uri_last->next = uri_curr; |
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} |
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else |
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{ |
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uri_head = uri_curr; |
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} |
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uri_last = uri_curr; |
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|
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vptr = aptr; |
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uri_curr->priority = DNS__16BIT(vptr); |
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vptr += sizeof(unsigned short); |
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uri_curr->weight = DNS__16BIT(vptr); |
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vptr += sizeof(unsigned short); |
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uri_curr->uri = (char *)ares_malloc(rr_len-3); |
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if (!uri_curr->uri) |
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{ |
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status = ARES_ENOMEM; |
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break; |
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} |
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uri_curr->uri = strncpy(uri_curr->uri, vptr, rr_len-4); |
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uri_curr->uri[rr_len-4]='\0'; |
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uri_curr->ttl = rr_ttl; |
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|
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if (status != ARES_SUCCESS) |
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break; |
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} |
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/* Don't lose memory in the next iteration */ |
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ares_free (rr_name); |
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rr_name = NULL; |
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/* Move on to the next record */ |
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aptr += rr_len; |
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} |
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if (uri_str) |
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ares_free (uri_str); |
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if (rr_name) |
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ares_free (rr_name); |
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|
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/* clean up on error */ |
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if (status != ARES_SUCCESS) |
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{ |
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if (uri_head) |
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ares_free_data (uri_head); |
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return status; |
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} |
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/* everything looks fine, return the data */ |
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*uri_out = uri_head; |
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return ARES_SUCCESS; |
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} |
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@ -0,0 +1,288 @@ |
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#include "ares-test.h" |
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#include "dns-proto.h" |
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#include <sstream> |
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#include <vector> |
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namespace ares { |
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namespace test { |
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TEST_F(LibraryTest, ParseUriReplyOK) { |
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DNSPacket pkt; |
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pkt.set_qid(0x1234).set_response().set_aa() |
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.add_question(new DNSQuestion("example.com", T_URI)) |
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.add_answer(new DNSUriRR("example.com", 100, 10, 20, "uri.example.com")) |
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.add_answer(new DNSUriRR("example.com", 200, 11, 21, "uri2.example.com")); |
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std::vector<byte> data = pkt.data(); |
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struct ares_uri_reply* uri = nullptr; |
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EXPECT_EQ(ARES_SUCCESS, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
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ASSERT_NE(nullptr, uri); |
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EXPECT_EQ("uri.example.com", std::string(uri->uri)); |
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EXPECT_EQ(10, uri->priority); |
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EXPECT_EQ(20, uri->weight); |
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EXPECT_EQ(100, uri->ttl); |
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struct ares_uri_reply* uri2 = uri->next; |
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ASSERT_NE(nullptr, uri2); |
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EXPECT_EQ("uri2.example.com", std::string(uri2->uri)); |
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EXPECT_EQ(11, uri2->priority); |
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EXPECT_EQ(21, uri2->weight); |
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EXPECT_EQ(200, uri2->ttl); |
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EXPECT_EQ(nullptr, uri2->next); |
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ares_free_data(uri); |
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} |
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TEST_F(LibraryTest, ParseUriReplySingle) { |
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DNSPacket pkt; |
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pkt.set_qid(0x1234).set_response().set_aa() |
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.add_question(new DNSQuestion("example.abc.def.com", T_URI)) |
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.add_answer(new DNSUriRR("example.abc.def.com", 180, 0, 10, "example.abc.def.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else1.where.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else2.where.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else3.where.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else4.where.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else5.where.com")) |
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.add_additional(new DNSARR("else2.where.com", 42, {172,19,0,1})) |
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.add_additional(new DNSARR("else5.where.com", 42, {172,19,0,2})); |
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std::vector<byte> data = pkt.data(); |
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struct ares_uri_reply* uri = nullptr; |
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EXPECT_EQ(ARES_SUCCESS, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
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ASSERT_NE(nullptr, uri); |
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EXPECT_EQ("example.abc.def.com", std::string(uri->uri)); |
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EXPECT_EQ(0, uri->priority); |
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EXPECT_EQ(10, uri->weight); |
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EXPECT_EQ(180, uri->ttl); |
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EXPECT_EQ(nullptr, uri->next); |
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ares_free_data(uri); |
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} |
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TEST_F(LibraryTest, ParseUriReplyMalformed) { |
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std::vector<byte> data = { |
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0x12, 0x34, // qid
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0x84, // response + query + AA + not-TC + not-RD
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0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError
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0x00, 0x01, // num questions
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0x00, 0x01, // num answer RRs
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0x00, 0x00, // num authority RRs
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0x00, 0x00, // num additional RRs
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// Question
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0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', |
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0x03, 'c', 'o', 'm', |
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0x00, |
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0x01, 0x00, // type URI
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0x00, 0x01, // class IN
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// Answer 1
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0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', |
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0x03, 'c', 'o', 'm', |
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0x00, |
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0x01, 0x00, // RR type
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0x00, 0x01, // class IN
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0x01, 0x02, 0x03, 0x04, // TTL
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0x00, 0x04, // rdata length -- too short
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0x02, 0x03, 0x04, 0x05, |
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}; |
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struct ares_uri_reply* uri = nullptr; |
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EXPECT_EQ(ARES_EBADRESP, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
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ASSERT_EQ(nullptr, uri); |
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} |
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TEST_F(LibraryTest, ParseUriReplyMultiple) { |
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DNSPacket pkt; |
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pkt.set_qid(0x1234).set_response().set_ra().set_rd() |
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.add_question(new DNSQuestion("uri.example.com", T_URI)) |
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.add_answer(new DNSUriRR("uri.example.com", 600, 0, 5, "a1.uri.example.com")) |
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.add_answer(new DNSUriRR("uri.example.com", 660, 0, 5, "a2.uri.example.com")) |
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.add_answer(new DNSUriRR("uri.example.com", 720, 0, 5, "a3.uri.example.com")) |
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.add_auth(new DNSNsRR("example.com", 300, "ns1.example.com")) |
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.add_auth(new DNSNsRR("example.com", 300, "ns2.example.com")) |
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.add_auth(new DNSNsRR("example.com", 300, "ns3.example.com")) |
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.add_additional(new DNSARR("a1.uri.example.com", 300, {172,19,1,1})) |
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.add_additional(new DNSARR("a2.uri.example.com", 300, {172,19,1,2})) |
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.add_additional(new DNSARR("a3.uri.example.com", 300, {172,19,1,3})) |
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.add_additional(new DNSARR("n1.example.com", 300, {172,19,0,1})) |
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.add_additional(new DNSARR("n2.example.com", 300, {172,19,0,2})) |
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.add_additional(new DNSARR("n3.example.com", 300, {172,19,0,3})); |
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std::vector<byte> data = pkt.data(); |
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struct ares_uri_reply* uri0 = nullptr; |
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EXPECT_EQ(ARES_SUCCESS, ares_parse_uri_reply(data.data(), data.size(), &uri0)); |
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ASSERT_NE(nullptr, uri0); |
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struct ares_uri_reply* uri = uri0; |
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EXPECT_EQ("a1.uri.example.com", std::string(uri->uri)); |
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EXPECT_EQ(0, uri->priority); |
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EXPECT_EQ(5, uri->weight); |
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EXPECT_EQ(600, uri->ttl); |
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EXPECT_NE(nullptr, uri->next); |
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uri = uri->next; |
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EXPECT_EQ("a2.uri.example.com", std::string(uri->uri)); |
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EXPECT_EQ(0, uri->priority); |
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EXPECT_EQ(5, uri->weight); |
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EXPECT_EQ(660, uri->ttl); |
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EXPECT_NE(nullptr, uri->next); |
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uri = uri->next; |
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EXPECT_EQ("a3.uri.example.com", std::string(uri->uri)); |
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EXPECT_EQ(0, uri->priority); |
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EXPECT_EQ(5, uri->weight); |
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EXPECT_EQ(720, uri->ttl); |
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EXPECT_EQ(nullptr, uri->next); |
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ares_free_data(uri0); |
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} |
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TEST_F(LibraryTest, ParseUriReplyCname) { |
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DNSPacket pkt; |
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pkt.set_qid(0x1234).set_response().set_aa() |
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.add_question(new DNSQuestion("example.abc.def.com", T_URI)) |
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.add_answer(new DNSCnameRR("example.abc.def.com", 300, "cname.abc.def.com")) |
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.add_answer(new DNSUriRR("cname.abc.def.com", 600, 0, 10, "uri.abc.def.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else1.where.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else2.where.com")) |
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.add_auth(new DNSNsRR("abc.def.com", 44, "else3.where.com")) |
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.add_additional(new DNSARR("example.abc.def.com", 300, {172,19,0,1})) |
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.add_additional(new DNSARR("else1.where.com", 42, {172,19,0,1})) |
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.add_additional(new DNSARR("else2.where.com", 42, {172,19,0,2})) |
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.add_additional(new DNSARR("else3.where.com", 42, {172,19,0,3})); |
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std::vector<byte> data = pkt.data(); |
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struct ares_uri_reply* uri = nullptr; |
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EXPECT_EQ(ARES_SUCCESS, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
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ASSERT_NE(nullptr, uri); |
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|
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EXPECT_EQ("uri.abc.def.com", std::string(uri->uri)); |
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EXPECT_EQ(0, uri->priority); |
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EXPECT_EQ(10, uri->weight); |
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EXPECT_EQ(600, uri->ttl); |
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EXPECT_EQ(nullptr, uri->next); |
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ares_free_data(uri); |
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} |
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TEST_F(LibraryTest, ParseUriReplyCnameMultiple) { |
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DNSPacket pkt; |
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pkt.set_qid(0x1234).set_response().set_ra().set_rd() |
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.add_question(new DNSQuestion("query.example.com", T_URI)) |
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.add_answer(new DNSCnameRR("query.example.com", 300, "uri.example.com")) |
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.add_answer(new DNSUriRR("uri.example.com", 600, 0, 5, "a1.uri.example.com")) |
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.add_answer(new DNSUriRR("uri.example.com", 660, 0, 5, "a2.uri.example.com")) |
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.add_answer(new DNSUriRR("uri.example.com", 720, 0, 5, "a3.uri.example.com")) |
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.add_auth(new DNSNsRR("example.com", 300, "ns1.example.com")) |
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.add_auth(new DNSNsRR("example.com", 300, "ns2.example.com")) |
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.add_auth(new DNSNsRR("example.com", 300, "ns3.example.com")) |
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.add_additional(new DNSARR("a1.uri.example.com", 300, {172,19,1,1})) |
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.add_additional(new DNSARR("a2.uri.example.com", 300, {172,19,1,2})) |
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.add_additional(new DNSARR("a3.uri.example.com", 300, {172,19,1,3})) |
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.add_additional(new DNSARR("n1.example.com", 300, {172,19,0,1})) |
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.add_additional(new DNSARR("n2.example.com", 300, {172,19,0,2})) |
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.add_additional(new DNSARR("n3.example.com", 300, {172,19,0,3})); |
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std::vector<byte> data = pkt.data(); |
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|
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struct ares_uri_reply* uri0 = nullptr; |
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EXPECT_EQ(ARES_SUCCESS, ares_parse_uri_reply(data.data(), data.size(), &uri0)); |
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ASSERT_NE(nullptr, uri0); |
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struct ares_uri_reply* uri = uri0; |
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|
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EXPECT_EQ("a1.uri.example.com", std::string(uri->uri)); |
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EXPECT_EQ(0, uri->priority); |
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EXPECT_EQ(5, uri->weight); |
||||
EXPECT_EQ(600, uri->ttl); |
||||
EXPECT_NE(nullptr, uri->next); |
||||
uri = uri->next; |
||||
|
||||
EXPECT_EQ("a2.uri.example.com", std::string(uri->uri)); |
||||
EXPECT_EQ(0, uri->priority); |
||||
EXPECT_EQ(5, uri->weight); |
||||
EXPECT_EQ(660, uri->ttl); |
||||
EXPECT_NE(nullptr, uri->next); |
||||
uri = uri->next; |
||||
|
||||
EXPECT_EQ("a3.uri.example.com", std::string(uri->uri)); |
||||
EXPECT_EQ(0, uri->priority); |
||||
EXPECT_EQ(5, uri->weight); |
||||
EXPECT_EQ(720, uri->ttl); |
||||
EXPECT_EQ(nullptr, uri->next); |
||||
|
||||
ares_free_data(uri0); |
||||
} |
||||
|
||||
TEST_F(LibraryTest, ParseUriReplyErrors) { |
||||
DNSPacket pkt; |
||||
pkt.set_qid(0x1234).set_response().set_aa() |
||||
.add_question(new DNSQuestion("example.abc.def.com", T_URI)) |
||||
.add_answer(new DNSUriRR("example.abc.def.com", 180, 0, 10, "example.abc.def.com")); |
||||
std::vector<byte> data; |
||||
struct ares_uri_reply* uri = nullptr; |
||||
|
||||
// No question.
|
||||
pkt.questions_.clear(); |
||||
data = pkt.data(); |
||||
EXPECT_EQ(ARES_EBADRESP, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
||||
pkt.add_question(new DNSQuestion("example.abc.def.com", T_URI)); |
||||
|
||||
#ifdef DISABLED |
||||
// Question != answer
|
||||
pkt.questions_.clear(); |
||||
pkt.add_question(new DNSQuestion("Axample.com", T_URI)); |
||||
data = pkt.data(); |
||||
EXPECT_EQ(ARES_ENODATA, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
||||
pkt.questions_.clear(); |
||||
pkt.add_question(new DNSQuestion("example.com", T_URI)); |
||||
#endif |
||||
|
||||
// Two questions.
|
||||
pkt.add_question(new DNSQuestion("example.abc.def.com", T_URI)); |
||||
data = pkt.data(); |
||||
EXPECT_EQ(ARES_EBADRESP, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
||||
pkt.questions_.clear(); |
||||
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR)); |
||||
|
||||
// Wrong sort of answer.
|
||||
pkt.answers_.clear(); |
||||
pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com")); |
||||
data = pkt.data(); |
||||
EXPECT_EQ(ARES_SUCCESS, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
||||
EXPECT_EQ(nullptr, uri); |
||||
pkt.answers_.clear(); |
||||
pkt.add_answer(new DNSUriRR("example.abc.def.com", 180, 0, 10, "example.abc.def.com")); |
||||
|
||||
// No answer.
|
||||
pkt.answers_.clear(); |
||||
data = pkt.data(); |
||||
EXPECT_EQ(ARES_ENODATA, ares_parse_uri_reply(data.data(), data.size(), &uri)); |
||||
pkt.add_answer(new DNSUriRR("example.abc.def.com", 180, 0, 10, "example.abc.def.com")); |
||||
|
||||
// Truncated packets.
|
||||
data = pkt.data(); |
||||
for (size_t len = 1; len < data.size(); len++) { |
||||
int rc = ares_parse_uri_reply(data.data(), len, &uri); |
||||
EXPECT_TRUE(rc == ARES_EBADRESP || rc == ARES_EBADNAME); |
||||
} |
||||
} |
||||
|
||||
TEST_F(LibraryTest, ParseUriReplyAllocFail) { |
||||
DNSPacket pkt; |
||||
pkt.set_qid(0x1234).set_response().set_aa() |
||||
.add_question(new DNSQuestion("example.abc.def.com", T_URI)) |
||||
.add_answer(new DNSCnameRR("example.com", 300, "c.example.com")) |
||||
.add_answer(new DNSUriRR("example.abc.def.com", 180, 0, 10, "example.abc.def.com")); |
||||
std::vector<byte> data = pkt.data(); |
||||
struct ares_uri_reply* uri = nullptr; |
||||
|
||||
for (int ii = 1; ii <= 5; ii++) { |
||||
ClearFails(); |
||||
SetAllocFail(ii); |
||||
EXPECT_EQ(ARES_ENOMEM, ares_parse_uri_reply(data.data(), data.size(), &uri)) << ii; |
||||
} |
||||
} |
||||
|
||||
} // namespace test
|
||||
} // namespace ares
|
||||
Loading…
Reference in new issue