1*00b67f09SDavid van Moolenbroek /* $NetBSD: lwres_gnba.c,v 1.5 2014/12/10 04:38:02 christos Exp $ */
2*00b67f09SDavid van Moolenbroek
3*00b67f09SDavid van Moolenbroek /*
4*00b67f09SDavid van Moolenbroek * Copyright (C) 2004, 2005, 2007, 2013 Internet Systems Consortium, Inc. ("ISC")
5*00b67f09SDavid van Moolenbroek * Copyright (C) 2000-2002 Internet Software Consortium.
6*00b67f09SDavid van Moolenbroek *
7*00b67f09SDavid van Moolenbroek * Permission to use, copy, modify, and/or distribute this software for any
8*00b67f09SDavid van Moolenbroek * purpose with or without fee is hereby granted, provided that the above
9*00b67f09SDavid van Moolenbroek * copyright notice and this permission notice appear in all copies.
10*00b67f09SDavid van Moolenbroek *
11*00b67f09SDavid van Moolenbroek * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12*00b67f09SDavid van Moolenbroek * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13*00b67f09SDavid van Moolenbroek * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14*00b67f09SDavid van Moolenbroek * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15*00b67f09SDavid van Moolenbroek * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16*00b67f09SDavid van Moolenbroek * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17*00b67f09SDavid van Moolenbroek * PERFORMANCE OF THIS SOFTWARE.
18*00b67f09SDavid van Moolenbroek */
19*00b67f09SDavid van Moolenbroek
20*00b67f09SDavid van Moolenbroek /* Id: lwres_gnba.c,v 1.28 2007/09/24 17:18:25 each Exp */
21*00b67f09SDavid van Moolenbroek
22*00b67f09SDavid van Moolenbroek /*! \file lwres_gnba.c
23*00b67f09SDavid van Moolenbroek These are low-level routines for creating and parsing lightweight
24*00b67f09SDavid van Moolenbroek resolver address-to-name lookup request and response messages.
25*00b67f09SDavid van Moolenbroek
26*00b67f09SDavid van Moolenbroek There are four main functions for the getnamebyaddr opcode. One
27*00b67f09SDavid van Moolenbroek render function converts a getnamebyaddr request structure --
28*00b67f09SDavid van Moolenbroek lwres_gnbarequest_t -- to the lightweight resolver's canonical
29*00b67f09SDavid van Moolenbroek format. It is complemented by a parse function that converts a
30*00b67f09SDavid van Moolenbroek packet in this canonical format to a getnamebyaddr request
31*00b67f09SDavid van Moolenbroek structure. Another render function converts the getnamebyaddr
32*00b67f09SDavid van Moolenbroek response structure -- lwres_gnbaresponse_t to the canonical format.
33*00b67f09SDavid van Moolenbroek This is complemented by a parse function which converts a packet in
34*00b67f09SDavid van Moolenbroek canonical format to a getnamebyaddr response structure.
35*00b67f09SDavid van Moolenbroek
36*00b67f09SDavid van Moolenbroek These structures are defined in \link lwres.h <lwres/lwres.h.>\endlink They are shown
37*00b67f09SDavid van Moolenbroek below.
38*00b67f09SDavid van Moolenbroek
39*00b67f09SDavid van Moolenbroek \code
40*00b67f09SDavid van Moolenbroek #define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U
41*00b67f09SDavid van Moolenbroek
42*00b67f09SDavid van Moolenbroek typedef struct {
43*00b67f09SDavid van Moolenbroek lwres_uint32_t flags;
44*00b67f09SDavid van Moolenbroek lwres_addr_t addr;
45*00b67f09SDavid van Moolenbroek } lwres_gnbarequest_t;
46*00b67f09SDavid van Moolenbroek
47*00b67f09SDavid van Moolenbroek typedef struct {
48*00b67f09SDavid van Moolenbroek lwres_uint32_t flags;
49*00b67f09SDavid van Moolenbroek lwres_uint16_t naliases;
50*00b67f09SDavid van Moolenbroek char *realname;
51*00b67f09SDavid van Moolenbroek char **aliases;
52*00b67f09SDavid van Moolenbroek lwres_uint16_t realnamelen;
53*00b67f09SDavid van Moolenbroek lwres_uint16_t *aliaslen;
54*00b67f09SDavid van Moolenbroek void *base;
55*00b67f09SDavid van Moolenbroek size_t baselen;
56*00b67f09SDavid van Moolenbroek } lwres_gnbaresponse_t;
57*00b67f09SDavid van Moolenbroek \endcode
58*00b67f09SDavid van Moolenbroek
59*00b67f09SDavid van Moolenbroek lwres_gnbarequest_render() uses resolver context ctx to convert
60*00b67f09SDavid van Moolenbroek getnamebyaddr request structure req to canonical format. The packet
61*00b67f09SDavid van Moolenbroek header structure pkt is initialised and transferred to buffer b.
62*00b67f09SDavid van Moolenbroek The contents of *req are then appended to the buffer in canonical
63*00b67f09SDavid van Moolenbroek format. lwres_gnbaresponse_render() performs the same task, except
64*00b67f09SDavid van Moolenbroek it converts a getnamebyaddr response structure lwres_gnbaresponse_t
65*00b67f09SDavid van Moolenbroek to the lightweight resolver's canonical format.
66*00b67f09SDavid van Moolenbroek
67*00b67f09SDavid van Moolenbroek lwres_gnbarequest_parse() uses context ctx to convert the contents
68*00b67f09SDavid van Moolenbroek of packet pkt to a lwres_gnbarequest_t structure. Buffer b provides
69*00b67f09SDavid van Moolenbroek space to be used for storing this structure. When the function
70*00b67f09SDavid van Moolenbroek succeeds, the resulting lwres_gnbarequest_t is made available
71*00b67f09SDavid van Moolenbroek through *structp. lwres_gnbaresponse_parse() offers the same
72*00b67f09SDavid van Moolenbroek semantics as lwres_gnbarequest_parse() except it yields a
73*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_t structure.
74*00b67f09SDavid van Moolenbroek
75*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_free() and lwres_gnbarequest_free() release the
76*00b67f09SDavid van Moolenbroek memory in resolver context ctx that was allocated to the
77*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_t or lwres_gnbarequest_t structures referenced
78*00b67f09SDavid van Moolenbroek via structp. Any memory associated with ancillary buffers and
79*00b67f09SDavid van Moolenbroek strings for those structures is also discarded.
80*00b67f09SDavid van Moolenbroek
81*00b67f09SDavid van Moolenbroek \section lwres_gbna_return Return Values
82*00b67f09SDavid van Moolenbroek
83*00b67f09SDavid van Moolenbroek The getnamebyaddr opcode functions lwres_gnbarequest_render(),
84*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_render() lwres_gnbarequest_parse() and
85*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_parse() all return #LWRES_R_SUCCESS on success.
86*00b67f09SDavid van Moolenbroek They return #LWRES_R_NOMEMORY if memory allocation fails.
87*00b67f09SDavid van Moolenbroek #LWRES_R_UNEXPECTEDEND is returned if the available space in the
88*00b67f09SDavid van Moolenbroek buffer b is too small to accommodate the packet header or the
89*00b67f09SDavid van Moolenbroek lwres_gnbarequest_t and lwres_gnbaresponse_t structures.
90*00b67f09SDavid van Moolenbroek lwres_gnbarequest_parse() and lwres_gnbaresponse_parse() will
91*00b67f09SDavid van Moolenbroek return #LWRES_R_UNEXPECTEDEND if the buffer is not empty after
92*00b67f09SDavid van Moolenbroek decoding the received packet. These functions will return
93*00b67f09SDavid van Moolenbroek #LWRES_R_FAILURE if pktflags in the packet header structure
94*00b67f09SDavid van Moolenbroek #lwres_lwpacket_t indicate that the packet is not a response to an
95*00b67f09SDavid van Moolenbroek earlier query.
96*00b67f09SDavid van Moolenbroek
97*00b67f09SDavid van Moolenbroek \section lwres_gbna_see See Also
98*00b67f09SDavid van Moolenbroek
99*00b67f09SDavid van Moolenbroek \link lwpacket.c lwres_packet\endlink
100*00b67f09SDavid van Moolenbroek
101*00b67f09SDavid van Moolenbroek */
102*00b67f09SDavid van Moolenbroek
103*00b67f09SDavid van Moolenbroek #include <config.h>
104*00b67f09SDavid van Moolenbroek
105*00b67f09SDavid van Moolenbroek #include <assert.h>
106*00b67f09SDavid van Moolenbroek #include <stdlib.h>
107*00b67f09SDavid van Moolenbroek #include <string.h>
108*00b67f09SDavid van Moolenbroek
109*00b67f09SDavid van Moolenbroek #include <lwres/lwbuffer.h>
110*00b67f09SDavid van Moolenbroek #include <lwres/lwpacket.h>
111*00b67f09SDavid van Moolenbroek #include <lwres/lwres.h>
112*00b67f09SDavid van Moolenbroek #include <lwres/result.h>
113*00b67f09SDavid van Moolenbroek
114*00b67f09SDavid van Moolenbroek #include "context_p.h"
115*00b67f09SDavid van Moolenbroek #include "assert_p.h"
116*00b67f09SDavid van Moolenbroek
117*00b67f09SDavid van Moolenbroek /*% Uses resolver context ctx to convert getnamebyaddr request structure req to canonical format. */
118*00b67f09SDavid van Moolenbroek lwres_result_t
lwres_gnbarequest_render(lwres_context_t * ctx,lwres_gnbarequest_t * req,lwres_lwpacket_t * pkt,lwres_buffer_t * b)119*00b67f09SDavid van Moolenbroek lwres_gnbarequest_render(lwres_context_t *ctx, lwres_gnbarequest_t *req,
120*00b67f09SDavid van Moolenbroek lwres_lwpacket_t *pkt, lwres_buffer_t *b)
121*00b67f09SDavid van Moolenbroek {
122*00b67f09SDavid van Moolenbroek unsigned char *buf;
123*00b67f09SDavid van Moolenbroek size_t buflen;
124*00b67f09SDavid van Moolenbroek int ret;
125*00b67f09SDavid van Moolenbroek size_t payload_length;
126*00b67f09SDavid van Moolenbroek
127*00b67f09SDavid van Moolenbroek REQUIRE(ctx != NULL);
128*00b67f09SDavid van Moolenbroek REQUIRE(req != NULL);
129*00b67f09SDavid van Moolenbroek REQUIRE(req->addr.family != 0);
130*00b67f09SDavid van Moolenbroek REQUIRE(req->addr.length != 0);
131*00b67f09SDavid van Moolenbroek REQUIRE(pkt != NULL);
132*00b67f09SDavid van Moolenbroek REQUIRE(b != NULL);
133*00b67f09SDavid van Moolenbroek
134*00b67f09SDavid van Moolenbroek payload_length = 4 + 4 + 2 + + req->addr.length;
135*00b67f09SDavid van Moolenbroek
136*00b67f09SDavid van Moolenbroek buflen = LWRES_LWPACKET_LENGTH + payload_length;
137*00b67f09SDavid van Moolenbroek buf = CTXMALLOC(buflen);
138*00b67f09SDavid van Moolenbroek if (buf == NULL)
139*00b67f09SDavid van Moolenbroek return (LWRES_R_NOMEMORY);
140*00b67f09SDavid van Moolenbroek lwres_buffer_init(b, buf, (unsigned int)buflen);
141*00b67f09SDavid van Moolenbroek
142*00b67f09SDavid van Moolenbroek pkt->length = (lwres_uint32_t)buflen;
143*00b67f09SDavid van Moolenbroek pkt->version = LWRES_LWPACKETVERSION_0;
144*00b67f09SDavid van Moolenbroek pkt->pktflags &= ~LWRES_LWPACKETFLAG_RESPONSE;
145*00b67f09SDavid van Moolenbroek pkt->opcode = LWRES_OPCODE_GETNAMEBYADDR;
146*00b67f09SDavid van Moolenbroek pkt->result = 0;
147*00b67f09SDavid van Moolenbroek pkt->authtype = 0;
148*00b67f09SDavid van Moolenbroek pkt->authlength = 0;
149*00b67f09SDavid van Moolenbroek
150*00b67f09SDavid van Moolenbroek ret = lwres_lwpacket_renderheader(b, pkt);
151*00b67f09SDavid van Moolenbroek if (ret != LWRES_R_SUCCESS) {
152*00b67f09SDavid van Moolenbroek lwres_buffer_invalidate(b);
153*00b67f09SDavid van Moolenbroek CTXFREE(buf, buflen);
154*00b67f09SDavid van Moolenbroek return (ret);
155*00b67f09SDavid van Moolenbroek }
156*00b67f09SDavid van Moolenbroek
157*00b67f09SDavid van Moolenbroek INSIST(SPACE_OK(b, payload_length));
158*00b67f09SDavid van Moolenbroek
159*00b67f09SDavid van Moolenbroek /*
160*00b67f09SDavid van Moolenbroek * Put the length and the data. We know this will fit because we
161*00b67f09SDavid van Moolenbroek * just checked for it.
162*00b67f09SDavid van Moolenbroek */
163*00b67f09SDavid van Moolenbroek lwres_buffer_putuint32(b, req->flags);
164*00b67f09SDavid van Moolenbroek lwres_buffer_putuint32(b, req->addr.family);
165*00b67f09SDavid van Moolenbroek lwres_buffer_putuint16(b, req->addr.length);
166*00b67f09SDavid van Moolenbroek lwres_buffer_putmem(b, (unsigned char *)req->addr.address,
167*00b67f09SDavid van Moolenbroek req->addr.length);
168*00b67f09SDavid van Moolenbroek
169*00b67f09SDavid van Moolenbroek INSIST(LWRES_BUFFER_AVAILABLECOUNT(b) == 0);
170*00b67f09SDavid van Moolenbroek
171*00b67f09SDavid van Moolenbroek return (LWRES_R_SUCCESS);
172*00b67f09SDavid van Moolenbroek }
173*00b67f09SDavid van Moolenbroek
174*00b67f09SDavid van Moolenbroek /*% Converts a getnamebyaddr response structure lwres_gnbaresponse_t to the lightweight resolver's canonical format. */
175*00b67f09SDavid van Moolenbroek lwres_result_t
lwres_gnbaresponse_render(lwres_context_t * ctx,lwres_gnbaresponse_t * req,lwres_lwpacket_t * pkt,lwres_buffer_t * b)176*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_render(lwres_context_t *ctx, lwres_gnbaresponse_t *req,
177*00b67f09SDavid van Moolenbroek lwres_lwpacket_t *pkt, lwres_buffer_t *b)
178*00b67f09SDavid van Moolenbroek {
179*00b67f09SDavid van Moolenbroek unsigned char *buf;
180*00b67f09SDavid van Moolenbroek size_t buflen;
181*00b67f09SDavid van Moolenbroek int ret;
182*00b67f09SDavid van Moolenbroek size_t payload_length;
183*00b67f09SDavid van Moolenbroek lwres_uint16_t datalen;
184*00b67f09SDavid van Moolenbroek int x;
185*00b67f09SDavid van Moolenbroek
186*00b67f09SDavid van Moolenbroek REQUIRE(ctx != NULL);
187*00b67f09SDavid van Moolenbroek REQUIRE(req != NULL);
188*00b67f09SDavid van Moolenbroek REQUIRE(pkt != NULL);
189*00b67f09SDavid van Moolenbroek REQUIRE(b != NULL);
190*00b67f09SDavid van Moolenbroek
191*00b67f09SDavid van Moolenbroek /*
192*00b67f09SDavid van Moolenbroek * Calculate packet size.
193*00b67f09SDavid van Moolenbroek */
194*00b67f09SDavid van Moolenbroek payload_length = 4; /* flags */
195*00b67f09SDavid van Moolenbroek payload_length += 2; /* naliases */
196*00b67f09SDavid van Moolenbroek payload_length += 2 + req->realnamelen + 1; /* real name encoding */
197*00b67f09SDavid van Moolenbroek for (x = 0; x < req->naliases; x++) /* each alias */
198*00b67f09SDavid van Moolenbroek payload_length += 2 + req->aliaslen[x] + 1;
199*00b67f09SDavid van Moolenbroek
200*00b67f09SDavid van Moolenbroek buflen = LWRES_LWPACKET_LENGTH + payload_length;
201*00b67f09SDavid van Moolenbroek buf = CTXMALLOC(buflen);
202*00b67f09SDavid van Moolenbroek if (buf == NULL)
203*00b67f09SDavid van Moolenbroek return (LWRES_R_NOMEMORY);
204*00b67f09SDavid van Moolenbroek lwres_buffer_init(b, buf, (unsigned int)buflen);
205*00b67f09SDavid van Moolenbroek
206*00b67f09SDavid van Moolenbroek pkt->length = (lwres_uint32_t)buflen;
207*00b67f09SDavid van Moolenbroek pkt->version = LWRES_LWPACKETVERSION_0;
208*00b67f09SDavid van Moolenbroek pkt->pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
209*00b67f09SDavid van Moolenbroek pkt->opcode = LWRES_OPCODE_GETNAMEBYADDR;
210*00b67f09SDavid van Moolenbroek pkt->authtype = 0;
211*00b67f09SDavid van Moolenbroek pkt->authlength = 0;
212*00b67f09SDavid van Moolenbroek
213*00b67f09SDavid van Moolenbroek ret = lwres_lwpacket_renderheader(b, pkt);
214*00b67f09SDavid van Moolenbroek if (ret != LWRES_R_SUCCESS) {
215*00b67f09SDavid van Moolenbroek lwres_buffer_invalidate(b);
216*00b67f09SDavid van Moolenbroek CTXFREE(buf, buflen);
217*00b67f09SDavid van Moolenbroek return (ret);
218*00b67f09SDavid van Moolenbroek }
219*00b67f09SDavid van Moolenbroek
220*00b67f09SDavid van Moolenbroek INSIST(SPACE_OK(b, payload_length));
221*00b67f09SDavid van Moolenbroek lwres_buffer_putuint32(b, req->flags);
222*00b67f09SDavid van Moolenbroek
223*00b67f09SDavid van Moolenbroek /* encode naliases */
224*00b67f09SDavid van Moolenbroek lwres_buffer_putuint16(b, req->naliases);
225*00b67f09SDavid van Moolenbroek
226*00b67f09SDavid van Moolenbroek /* encode the real name */
227*00b67f09SDavid van Moolenbroek datalen = req->realnamelen;
228*00b67f09SDavid van Moolenbroek lwres_buffer_putuint16(b, datalen);
229*00b67f09SDavid van Moolenbroek lwres_buffer_putmem(b, (unsigned char *)req->realname, datalen);
230*00b67f09SDavid van Moolenbroek lwres_buffer_putuint8(b, 0);
231*00b67f09SDavid van Moolenbroek
232*00b67f09SDavid van Moolenbroek /* encode the aliases */
233*00b67f09SDavid van Moolenbroek for (x = 0; x < req->naliases; x++) {
234*00b67f09SDavid van Moolenbroek datalen = req->aliaslen[x];
235*00b67f09SDavid van Moolenbroek lwres_buffer_putuint16(b, datalen);
236*00b67f09SDavid van Moolenbroek lwres_buffer_putmem(b, (unsigned char *)req->aliases[x],
237*00b67f09SDavid van Moolenbroek datalen);
238*00b67f09SDavid van Moolenbroek lwres_buffer_putuint8(b, 0);
239*00b67f09SDavid van Moolenbroek }
240*00b67f09SDavid van Moolenbroek
241*00b67f09SDavid van Moolenbroek INSIST(LWRES_BUFFER_AVAILABLECOUNT(b) == 0);
242*00b67f09SDavid van Moolenbroek
243*00b67f09SDavid van Moolenbroek return (LWRES_R_SUCCESS);
244*00b67f09SDavid van Moolenbroek }
245*00b67f09SDavid van Moolenbroek
246*00b67f09SDavid van Moolenbroek /*% Uses context ctx to convert the contents of packet pkt to a lwres_gnbarequest_t structure. */
247*00b67f09SDavid van Moolenbroek lwres_result_t
lwres_gnbarequest_parse(lwres_context_t * ctx,lwres_buffer_t * b,lwres_lwpacket_t * pkt,lwres_gnbarequest_t ** structp)248*00b67f09SDavid van Moolenbroek lwres_gnbarequest_parse(lwres_context_t *ctx, lwres_buffer_t *b,
249*00b67f09SDavid van Moolenbroek lwres_lwpacket_t *pkt, lwres_gnbarequest_t **structp)
250*00b67f09SDavid van Moolenbroek {
251*00b67f09SDavid van Moolenbroek int ret;
252*00b67f09SDavid van Moolenbroek lwres_gnbarequest_t *gnba;
253*00b67f09SDavid van Moolenbroek
254*00b67f09SDavid van Moolenbroek REQUIRE(ctx != NULL);
255*00b67f09SDavid van Moolenbroek REQUIRE(pkt != NULL);
256*00b67f09SDavid van Moolenbroek REQUIRE(b != NULL);
257*00b67f09SDavid van Moolenbroek REQUIRE(structp != NULL && *structp == NULL);
258*00b67f09SDavid van Moolenbroek
259*00b67f09SDavid van Moolenbroek if ((pkt->pktflags & LWRES_LWPACKETFLAG_RESPONSE) != 0)
260*00b67f09SDavid van Moolenbroek return (LWRES_R_FAILURE);
261*00b67f09SDavid van Moolenbroek
262*00b67f09SDavid van Moolenbroek if (!SPACE_REMAINING(b, 4))
263*00b67f09SDavid van Moolenbroek return (LWRES_R_UNEXPECTEDEND);
264*00b67f09SDavid van Moolenbroek
265*00b67f09SDavid van Moolenbroek gnba = CTXMALLOC(sizeof(lwres_gnbarequest_t));
266*00b67f09SDavid van Moolenbroek if (gnba == NULL)
267*00b67f09SDavid van Moolenbroek return (LWRES_R_NOMEMORY);
268*00b67f09SDavid van Moolenbroek
269*00b67f09SDavid van Moolenbroek gnba->flags = lwres_buffer_getuint32(b);
270*00b67f09SDavid van Moolenbroek
271*00b67f09SDavid van Moolenbroek ret = lwres_addr_parse(b, &gnba->addr);
272*00b67f09SDavid van Moolenbroek if (ret != LWRES_R_SUCCESS)
273*00b67f09SDavid van Moolenbroek goto out;
274*00b67f09SDavid van Moolenbroek
275*00b67f09SDavid van Moolenbroek if (LWRES_BUFFER_REMAINING(b) != 0) {
276*00b67f09SDavid van Moolenbroek ret = LWRES_R_TRAILINGDATA;
277*00b67f09SDavid van Moolenbroek goto out;
278*00b67f09SDavid van Moolenbroek }
279*00b67f09SDavid van Moolenbroek
280*00b67f09SDavid van Moolenbroek *structp = gnba;
281*00b67f09SDavid van Moolenbroek return (LWRES_R_SUCCESS);
282*00b67f09SDavid van Moolenbroek
283*00b67f09SDavid van Moolenbroek out:
284*00b67f09SDavid van Moolenbroek if (gnba != NULL)
285*00b67f09SDavid van Moolenbroek lwres_gnbarequest_free(ctx, &gnba);
286*00b67f09SDavid van Moolenbroek
287*00b67f09SDavid van Moolenbroek return (ret);
288*00b67f09SDavid van Moolenbroek }
289*00b67f09SDavid van Moolenbroek
290*00b67f09SDavid van Moolenbroek /*% Offers the same semantics as lwres_gnbarequest_parse() except it yields a lwres_gnbaresponse_t structure. */
291*00b67f09SDavid van Moolenbroek
292*00b67f09SDavid van Moolenbroek lwres_result_t
lwres_gnbaresponse_parse(lwres_context_t * ctx,lwres_buffer_t * b,lwres_lwpacket_t * pkt,lwres_gnbaresponse_t ** structp)293*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_parse(lwres_context_t *ctx, lwres_buffer_t *b,
294*00b67f09SDavid van Moolenbroek lwres_lwpacket_t *pkt, lwres_gnbaresponse_t **structp)
295*00b67f09SDavid van Moolenbroek {
296*00b67f09SDavid van Moolenbroek int ret;
297*00b67f09SDavid van Moolenbroek unsigned int x;
298*00b67f09SDavid van Moolenbroek lwres_uint32_t flags;
299*00b67f09SDavid van Moolenbroek lwres_uint16_t naliases;
300*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_t *gnba;
301*00b67f09SDavid van Moolenbroek
302*00b67f09SDavid van Moolenbroek REQUIRE(ctx != NULL);
303*00b67f09SDavid van Moolenbroek REQUIRE(pkt != NULL);
304*00b67f09SDavid van Moolenbroek REQUIRE(b != NULL);
305*00b67f09SDavid van Moolenbroek REQUIRE(structp != NULL && *structp == NULL);
306*00b67f09SDavid van Moolenbroek
307*00b67f09SDavid van Moolenbroek gnba = NULL;
308*00b67f09SDavid van Moolenbroek
309*00b67f09SDavid van Moolenbroek if ((pkt->pktflags & LWRES_LWPACKETFLAG_RESPONSE) == 0)
310*00b67f09SDavid van Moolenbroek return (LWRES_R_FAILURE);
311*00b67f09SDavid van Moolenbroek
312*00b67f09SDavid van Moolenbroek /*
313*00b67f09SDavid van Moolenbroek * Pull off flags & naliases
314*00b67f09SDavid van Moolenbroek */
315*00b67f09SDavid van Moolenbroek if (!SPACE_REMAINING(b, 4 + 2))
316*00b67f09SDavid van Moolenbroek return (LWRES_R_UNEXPECTEDEND);
317*00b67f09SDavid van Moolenbroek flags = lwres_buffer_getuint32(b);
318*00b67f09SDavid van Moolenbroek naliases = lwres_buffer_getuint16(b);
319*00b67f09SDavid van Moolenbroek
320*00b67f09SDavid van Moolenbroek gnba = CTXMALLOC(sizeof(lwres_gnbaresponse_t));
321*00b67f09SDavid van Moolenbroek if (gnba == NULL)
322*00b67f09SDavid van Moolenbroek return (LWRES_R_NOMEMORY);
323*00b67f09SDavid van Moolenbroek gnba->base = NULL;
324*00b67f09SDavid van Moolenbroek gnba->aliases = NULL;
325*00b67f09SDavid van Moolenbroek gnba->aliaslen = NULL;
326*00b67f09SDavid van Moolenbroek
327*00b67f09SDavid van Moolenbroek gnba->flags = flags;
328*00b67f09SDavid van Moolenbroek gnba->naliases = naliases;
329*00b67f09SDavid van Moolenbroek
330*00b67f09SDavid van Moolenbroek if (naliases > 0) {
331*00b67f09SDavid van Moolenbroek gnba->aliases = CTXMALLOC(sizeof(char *) * naliases);
332*00b67f09SDavid van Moolenbroek if (gnba->aliases == NULL) {
333*00b67f09SDavid van Moolenbroek ret = LWRES_R_NOMEMORY;
334*00b67f09SDavid van Moolenbroek goto out;
335*00b67f09SDavid van Moolenbroek }
336*00b67f09SDavid van Moolenbroek
337*00b67f09SDavid van Moolenbroek gnba->aliaslen = CTXMALLOC(sizeof(lwres_uint16_t) * naliases);
338*00b67f09SDavid van Moolenbroek if (gnba->aliaslen == NULL) {
339*00b67f09SDavid van Moolenbroek ret = LWRES_R_NOMEMORY;
340*00b67f09SDavid van Moolenbroek goto out;
341*00b67f09SDavid van Moolenbroek }
342*00b67f09SDavid van Moolenbroek }
343*00b67f09SDavid van Moolenbroek
344*00b67f09SDavid van Moolenbroek /*
345*00b67f09SDavid van Moolenbroek * Now, pull off the real name.
346*00b67f09SDavid van Moolenbroek */
347*00b67f09SDavid van Moolenbroek ret = lwres_string_parse(b, &gnba->realname, &gnba->realnamelen);
348*00b67f09SDavid van Moolenbroek if (ret != LWRES_R_SUCCESS)
349*00b67f09SDavid van Moolenbroek goto out;
350*00b67f09SDavid van Moolenbroek
351*00b67f09SDavid van Moolenbroek /*
352*00b67f09SDavid van Moolenbroek * Parse off the aliases.
353*00b67f09SDavid van Moolenbroek */
354*00b67f09SDavid van Moolenbroek for (x = 0; x < gnba->naliases; x++) {
355*00b67f09SDavid van Moolenbroek ret = lwres_string_parse(b, &gnba->aliases[x],
356*00b67f09SDavid van Moolenbroek &gnba->aliaslen[x]);
357*00b67f09SDavid van Moolenbroek if (ret != LWRES_R_SUCCESS)
358*00b67f09SDavid van Moolenbroek goto out;
359*00b67f09SDavid van Moolenbroek }
360*00b67f09SDavid van Moolenbroek
361*00b67f09SDavid van Moolenbroek if (LWRES_BUFFER_REMAINING(b) != 0) {
362*00b67f09SDavid van Moolenbroek ret = LWRES_R_TRAILINGDATA;
363*00b67f09SDavid van Moolenbroek goto out;
364*00b67f09SDavid van Moolenbroek }
365*00b67f09SDavid van Moolenbroek
366*00b67f09SDavid van Moolenbroek *structp = gnba;
367*00b67f09SDavid van Moolenbroek return (LWRES_R_SUCCESS);
368*00b67f09SDavid van Moolenbroek
369*00b67f09SDavid van Moolenbroek out:
370*00b67f09SDavid van Moolenbroek if (gnba != NULL) {
371*00b67f09SDavid van Moolenbroek if (gnba->aliases != NULL)
372*00b67f09SDavid van Moolenbroek CTXFREE(gnba->aliases, sizeof(char *) * naliases);
373*00b67f09SDavid van Moolenbroek if (gnba->aliaslen != NULL)
374*00b67f09SDavid van Moolenbroek CTXFREE(gnba->aliaslen,
375*00b67f09SDavid van Moolenbroek sizeof(lwres_uint16_t) * naliases);
376*00b67f09SDavid van Moolenbroek CTXFREE(gnba, sizeof(lwres_gnbaresponse_t));
377*00b67f09SDavid van Moolenbroek }
378*00b67f09SDavid van Moolenbroek
379*00b67f09SDavid van Moolenbroek return (ret);
380*00b67f09SDavid van Moolenbroek }
381*00b67f09SDavid van Moolenbroek
382*00b67f09SDavid van Moolenbroek /*% Release the memory in resolver context ctx that was allocated to the lwres_gnbarequest_t. */
383*00b67f09SDavid van Moolenbroek void
lwres_gnbarequest_free(lwres_context_t * ctx,lwres_gnbarequest_t ** structp)384*00b67f09SDavid van Moolenbroek lwres_gnbarequest_free(lwres_context_t *ctx, lwres_gnbarequest_t **structp)
385*00b67f09SDavid van Moolenbroek {
386*00b67f09SDavid van Moolenbroek lwres_gnbarequest_t *gnba;
387*00b67f09SDavid van Moolenbroek
388*00b67f09SDavid van Moolenbroek REQUIRE(ctx != NULL);
389*00b67f09SDavid van Moolenbroek REQUIRE(structp != NULL && *structp != NULL);
390*00b67f09SDavid van Moolenbroek
391*00b67f09SDavid van Moolenbroek gnba = *structp;
392*00b67f09SDavid van Moolenbroek *structp = NULL;
393*00b67f09SDavid van Moolenbroek
394*00b67f09SDavid van Moolenbroek CTXFREE(gnba, sizeof(lwres_gnbarequest_t));
395*00b67f09SDavid van Moolenbroek }
396*00b67f09SDavid van Moolenbroek
397*00b67f09SDavid van Moolenbroek /*% Release the memory in resolver context ctx that was allocated to the lwres_gnbaresponse_t. */
398*00b67f09SDavid van Moolenbroek void
lwres_gnbaresponse_free(lwres_context_t * ctx,lwres_gnbaresponse_t ** structp)399*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_free(lwres_context_t *ctx, lwres_gnbaresponse_t **structp)
400*00b67f09SDavid van Moolenbroek {
401*00b67f09SDavid van Moolenbroek lwres_gnbaresponse_t *gnba;
402*00b67f09SDavid van Moolenbroek
403*00b67f09SDavid van Moolenbroek REQUIRE(ctx != NULL);
404*00b67f09SDavid van Moolenbroek REQUIRE(structp != NULL && *structp != NULL);
405*00b67f09SDavid van Moolenbroek
406*00b67f09SDavid van Moolenbroek gnba = *structp;
407*00b67f09SDavid van Moolenbroek *structp = NULL;
408*00b67f09SDavid van Moolenbroek
409*00b67f09SDavid van Moolenbroek if (gnba->naliases > 0) {
410*00b67f09SDavid van Moolenbroek CTXFREE(gnba->aliases, sizeof(char *) * gnba->naliases);
411*00b67f09SDavid van Moolenbroek CTXFREE(gnba->aliaslen,
412*00b67f09SDavid van Moolenbroek sizeof(lwres_uint16_t) * gnba->naliases);
413*00b67f09SDavid van Moolenbroek }
414*00b67f09SDavid van Moolenbroek if (gnba->base != NULL)
415*00b67f09SDavid van Moolenbroek CTXFREE(gnba->base, gnba->baselen);
416*00b67f09SDavid van Moolenbroek CTXFREE(gnba, sizeof(lwres_gnbaresponse_t));
417*00b67f09SDavid van Moolenbroek }
418