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Mini Shell
Mini Shell
/* MIT License
*
* Copyright (c) 2023 Brad House
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares_setup.h"
#include "ares.h"
#include "ares_private.h"
#include <limits.h>
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
ares_status_t ares_dns_record_create(ares_dns_record_t **dnsrec,
unsigned short id, unsigned short flags,
ares_dns_opcode_t opcode,
ares_dns_rcode_t rcode)
{
if (dnsrec == NULL) {
return ARES_EFORMERR;
}
*dnsrec = NULL;
if (!ares_dns_opcode_isvalid(opcode) || !ares_dns_rcode_isvalid(rcode) ||
!ares_dns_flags_arevalid(flags)) {
return ARES_EFORMERR;
}
*dnsrec = ares_malloc_zero(sizeof(**dnsrec));
if (*dnsrec == NULL) {
return ARES_ENOMEM;
}
(*dnsrec)->id = id;
(*dnsrec)->flags = flags;
(*dnsrec)->opcode = opcode;
(*dnsrec)->rcode = rcode;
return ARES_SUCCESS;
}
unsigned short ares_dns_record_get_id(const ares_dns_record_t *dnsrec)
{
if (dnsrec == NULL) {
return 0;
}
return dnsrec->id;
}
unsigned short ares_dns_record_get_flags(const ares_dns_record_t *dnsrec)
{
if (dnsrec == NULL) {
return 0;
}
return dnsrec->flags;
}
ares_dns_opcode_t ares_dns_record_get_opcode(const ares_dns_record_t *dnsrec)
{
if (dnsrec == NULL) {
return 0;
}
return dnsrec->opcode;
}
ares_dns_rcode_t ares_dns_record_get_rcode(const ares_dns_record_t *dnsrec)
{
if (dnsrec == NULL) {
return 0;
}
return dnsrec->rcode;
}
static void ares__dns_options_free(ares__dns_options_t *options)
{
size_t i;
if (options == NULL) {
return;
}
for (i = 0; i < options->cnt; i++) {
ares_free(options->optval[i].val);
}
ares_free(options->optval);
ares_free(options);
}
static void ares__dns_rr_free(ares_dns_rr_t *rr)
{
ares_free(rr->name);
switch (rr->type) {
case ARES_REC_TYPE_A:
case ARES_REC_TYPE_AAAA:
case ARES_REC_TYPE_ANY:
/* Nothing to free */
break;
case ARES_REC_TYPE_NS:
ares_free(rr->r.ns.nsdname);
break;
case ARES_REC_TYPE_CNAME:
ares_free(rr->r.cname.cname);
break;
case ARES_REC_TYPE_SOA:
ares_free(rr->r.soa.mname);
ares_free(rr->r.soa.rname);
break;
case ARES_REC_TYPE_PTR:
ares_free(rr->r.ptr.dname);
break;
case ARES_REC_TYPE_HINFO:
ares_free(rr->r.hinfo.cpu);
ares_free(rr->r.hinfo.os);
break;
case ARES_REC_TYPE_MX:
ares_free(rr->r.mx.exchange);
break;
case ARES_REC_TYPE_TXT:
ares_free(rr->r.txt.data);
break;
case ARES_REC_TYPE_SRV:
ares_free(rr->r.srv.target);
break;
case ARES_REC_TYPE_NAPTR:
ares_free(rr->r.naptr.flags);
ares_free(rr->r.naptr.services);
ares_free(rr->r.naptr.regexp);
ares_free(rr->r.naptr.replacement);
break;
case ARES_REC_TYPE_OPT:
ares__dns_options_free(rr->r.opt.options);
break;
case ARES_REC_TYPE_TLSA:
ares_free(rr->r.tlsa.data);
break;
case ARES_REC_TYPE_SVCB:
ares_free(rr->r.svcb.target);
ares__dns_options_free(rr->r.svcb.params);
break;
case ARES_REC_TYPE_HTTPS:
ares_free(rr->r.https.target);
ares__dns_options_free(rr->r.https.params);
break;
case ARES_REC_TYPE_URI:
ares_free(rr->r.uri.target);
break;
case ARES_REC_TYPE_CAA:
ares_free(rr->r.caa.tag);
ares_free(rr->r.caa.value);
break;
case ARES_REC_TYPE_RAW_RR:
ares_free(rr->r.raw_rr.data);
break;
}
}
void ares_dns_record_destroy(ares_dns_record_t *dnsrec)
{
size_t i;
if (dnsrec == NULL) {
return;
}
/* Free questions */
for (i = 0; i < dnsrec->qdcount; i++) {
ares_free(dnsrec->qd[i].name);
}
ares_free(dnsrec->qd);
/* Free answers */
for (i = 0; i < dnsrec->ancount; i++) {
ares__dns_rr_free(&dnsrec->an[i]);
}
ares_free(dnsrec->an);
/* Free authority */
for (i = 0; i < dnsrec->nscount; i++) {
ares__dns_rr_free(&dnsrec->ns[i]);
}
ares_free(dnsrec->ns);
/* Free additional */
for (i = 0; i < dnsrec->arcount; i++) {
ares__dns_rr_free(&dnsrec->ar[i]);
}
ares_free(dnsrec->ar);
ares_free(dnsrec);
}
size_t ares_dns_record_query_cnt(const ares_dns_record_t *dnsrec)
{
if (dnsrec == NULL) {
return 0;
}
return dnsrec->qdcount;
}
ares_status_t ares_dns_record_query_add(ares_dns_record_t *dnsrec,
const char *name,
ares_dns_rec_type_t qtype,
ares_dns_class_t qclass)
{
ares_dns_qd_t *temp = NULL;
size_t idx;
if (dnsrec == NULL || name == NULL ||
!ares_dns_rec_type_isvalid(qtype, ARES_TRUE) ||
!ares_dns_class_isvalid(qclass, ARES_TRUE)) {
return ARES_EFORMERR;
}
if (dnsrec->qdcount >= dnsrec->qdalloc) {
size_t alloc_cnt = ares__round_up_pow2(dnsrec->qdcount + 1);
temp = ares_realloc_zero(dnsrec->qd, sizeof(*temp) * (dnsrec->qdalloc),
sizeof(*temp) * alloc_cnt);
if (temp == NULL) {
return ARES_ENOMEM;
}
dnsrec->qdalloc = alloc_cnt;
dnsrec->qd = temp;
}
idx = dnsrec->qdcount;
dnsrec->qd[idx].name = ares_strdup(name);
if (dnsrec->qd[idx].name == NULL) {
/* No need to clean up anything */
return ARES_ENOMEM;
}
dnsrec->qd[idx].qtype = qtype;
dnsrec->qd[idx].qclass = qclass;
dnsrec->qdcount++;
return ARES_SUCCESS;
}
ares_status_t ares_dns_record_query_get(const ares_dns_record_t *dnsrec,
size_t idx, const char **name,
ares_dns_rec_type_t *qtype,
ares_dns_class_t *qclass)
{
if (dnsrec == NULL || idx >= dnsrec->qdcount) {
return ARES_EFORMERR;
}
if (name != NULL) {
*name = dnsrec->qd[idx].name;
}
if (qtype != NULL) {
*qtype = dnsrec->qd[idx].qtype;
}
if (qclass != NULL) {
*qclass = dnsrec->qd[idx].qclass;
}
return ARES_SUCCESS;
}
size_t ares_dns_record_rr_cnt(const ares_dns_record_t *dnsrec,
ares_dns_section_t sect)
{
if (dnsrec == NULL || !ares_dns_section_isvalid(sect)) {
return 0;
}
switch (sect) {
case ARES_SECTION_ANSWER:
return dnsrec->ancount;
case ARES_SECTION_AUTHORITY:
return dnsrec->nscount;
case ARES_SECTION_ADDITIONAL:
return dnsrec->arcount;
}
return 0;
}
ares_status_t ares_dns_record_rr_prealloc(ares_dns_record_t *dnsrec,
ares_dns_section_t sect, size_t cnt)
{
ares_dns_rr_t **rr_ptr = NULL;
size_t *rr_alloc = NULL;
ares_dns_rr_t *temp = NULL;
if (dnsrec == NULL || cnt == 0 || !ares_dns_section_isvalid(sect)) {
return ARES_EFORMERR;
}
switch (sect) {
case ARES_SECTION_ANSWER:
rr_ptr = &dnsrec->an;
rr_alloc = &dnsrec->analloc;
break;
case ARES_SECTION_AUTHORITY:
rr_ptr = &dnsrec->ns;
rr_alloc = &dnsrec->nsalloc;
break;
case ARES_SECTION_ADDITIONAL:
rr_ptr = &dnsrec->ar;
rr_alloc = &dnsrec->aralloc;
break;
}
/* Round up cnt to a power of 2 */
cnt = ares__round_up_pow2(cnt);
/* Already have that */
if (cnt <= *rr_alloc) {
return ARES_SUCCESS;
}
temp = ares_realloc_zero(*rr_ptr, sizeof(*temp) * (*rr_alloc),
sizeof(*temp) * cnt);
if (temp == NULL) {
return ARES_ENOMEM;
}
*rr_alloc = cnt;
*rr_ptr = temp;
return ARES_SUCCESS;
}
ares_status_t ares_dns_record_rr_add(ares_dns_rr_t **rr_out,
ares_dns_record_t *dnsrec,
ares_dns_section_t sect, const char *name,
ares_dns_rec_type_t type,
ares_dns_class_t rclass, unsigned int ttl)
{
ares_dns_rr_t **rr_ptr = NULL;
ares_dns_rr_t *rr = NULL;
size_t *rr_len = NULL;
ares_status_t status;
size_t idx;
if (dnsrec == NULL || name == NULL || rr_out == NULL ||
!ares_dns_section_isvalid(sect) ||
!ares_dns_rec_type_isvalid(type, ARES_FALSE) ||
!ares_dns_class_isvalid(rclass, ARES_FALSE)) {
return ARES_EFORMERR;
}
*rr_out = NULL;
switch (sect) {
case ARES_SECTION_ANSWER:
rr_ptr = &dnsrec->an;
rr_len = &dnsrec->ancount;
break;
case ARES_SECTION_AUTHORITY:
rr_ptr = &dnsrec->ns;
rr_len = &dnsrec->nscount;
break;
case ARES_SECTION_ADDITIONAL:
rr_ptr = &dnsrec->ar;
rr_len = &dnsrec->arcount;
break;
}
status = ares_dns_record_rr_prealloc(dnsrec, sect, *rr_len + 1);
if (status != ARES_SUCCESS) {
return status;
}
idx = *rr_len;
rr = &(*rr_ptr)[idx];
rr->name = ares_strdup(name);
if (rr->name == NULL) {
/* No need to clean up anything */
return ARES_ENOMEM;
}
rr->parent = dnsrec;
rr->type = type;
rr->rclass = rclass;
rr->ttl = ttl;
(*rr_len)++;
*rr_out = rr;
return ARES_SUCCESS;
}
ares_status_t ares_dns_record_rr_del(ares_dns_record_t *dnsrec,
ares_dns_section_t sect, size_t idx)
{
ares_dns_rr_t *rr_ptr = NULL;
size_t *rr_len = NULL;
size_t cnt_after;
if (dnsrec == NULL || !ares_dns_section_isvalid(sect)) {
return ARES_EFORMERR;
}
switch (sect) {
case ARES_SECTION_ANSWER:
rr_ptr = dnsrec->an;
rr_len = &dnsrec->ancount;
break;
case ARES_SECTION_AUTHORITY:
rr_ptr = dnsrec->ns;
rr_len = &dnsrec->nscount;
break;
case ARES_SECTION_ADDITIONAL:
rr_ptr = dnsrec->ar;
rr_len = &dnsrec->arcount;
break;
}
if (idx >= *rr_len) {
return ARES_EFORMERR;
}
ares__dns_rr_free(&rr_ptr[idx]);
cnt_after = *rr_len - idx - 1;
if (cnt_after) {
memmove(&rr_ptr[idx], &rr_ptr[idx + 1], sizeof(*rr_ptr) * cnt_after);
}
(*rr_len)--;
return ARES_SUCCESS;
}
ares_dns_rr_t *ares_dns_record_rr_get(ares_dns_record_t *dnsrec,
ares_dns_section_t sect, size_t idx)
{
ares_dns_rr_t *rr_ptr = NULL;
size_t rr_len = 0;
if (dnsrec == NULL || !ares_dns_section_isvalid(sect)) {
return NULL;
}
switch (sect) {
case ARES_SECTION_ANSWER:
rr_ptr = dnsrec->an;
rr_len = dnsrec->ancount;
break;
case ARES_SECTION_AUTHORITY:
rr_ptr = dnsrec->ns;
rr_len = dnsrec->nscount;
break;
case ARES_SECTION_ADDITIONAL:
rr_ptr = dnsrec->ar;
rr_len = dnsrec->arcount;
break;
}
if (idx >= rr_len) {
return NULL;
}
return &rr_ptr[idx];
}
static const ares_dns_rr_t *
ares_dns_record_rr_get_const(const ares_dns_record_t *dnsrec,
ares_dns_section_t sect, size_t idx)
{
return ares_dns_record_rr_get((void *)((size_t)dnsrec), sect, idx);
}
const char *ares_dns_rr_get_name(const ares_dns_rr_t *rr)
{
if (rr == NULL) {
return NULL;
}
return rr->name;
}
ares_dns_rec_type_t ares_dns_rr_get_type(const ares_dns_rr_t *rr)
{
if (rr == NULL) {
return 0;
}
return rr->type;
}
ares_dns_class_t ares_dns_rr_get_class(const ares_dns_rr_t *rr)
{
if (rr == NULL) {
return 0;
}
return rr->rclass;
}
unsigned int ares_dns_rr_get_ttl(const ares_dns_rr_t *rr)
{
if (rr == NULL) {
return 0;
}
return rr->ttl;
}
static void *ares_dns_rr_data_ptr(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
size_t **lenptr)
{
if (dns_rr == NULL || dns_rr->type != ares_dns_rr_key_to_rec_type(key)) {
return NULL;
}
switch (key) {
case ARES_RR_A_ADDR:
return &dns_rr->r.a.addr;
case ARES_RR_NS_NSDNAME:
return &dns_rr->r.ns.nsdname;
case ARES_RR_CNAME_CNAME:
return &dns_rr->r.cname.cname;
case ARES_RR_SOA_MNAME:
return &dns_rr->r.soa.mname;
case ARES_RR_SOA_RNAME:
return &dns_rr->r.soa.rname;
case ARES_RR_SOA_SERIAL:
return &dns_rr->r.soa.serial;
case ARES_RR_SOA_REFRESH:
return &dns_rr->r.soa.refresh;
case ARES_RR_SOA_RETRY:
return &dns_rr->r.soa.retry;
case ARES_RR_SOA_EXPIRE:
return &dns_rr->r.soa.expire;
case ARES_RR_SOA_MINIMUM:
return &dns_rr->r.soa.minimum;
case ARES_RR_PTR_DNAME:
return &dns_rr->r.ptr.dname;
case ARES_RR_AAAA_ADDR:
return &dns_rr->r.aaaa.addr;
case ARES_RR_HINFO_CPU:
return &dns_rr->r.hinfo.cpu;
case ARES_RR_HINFO_OS:
return &dns_rr->r.hinfo.os;
case ARES_RR_MX_PREFERENCE:
return &dns_rr->r.mx.preference;
case ARES_RR_MX_EXCHANGE:
return &dns_rr->r.mx.exchange;
case ARES_RR_TXT_DATA:
if (lenptr == NULL) {
return NULL;
}
*lenptr = &dns_rr->r.txt.data_len;
return &dns_rr->r.txt.data;
case ARES_RR_SRV_PRIORITY:
return &dns_rr->r.srv.priority;
case ARES_RR_SRV_WEIGHT:
return &dns_rr->r.srv.weight;
case ARES_RR_SRV_PORT:
return &dns_rr->r.srv.port;
case ARES_RR_SRV_TARGET:
return &dns_rr->r.srv.target;
case ARES_RR_NAPTR_ORDER:
return &dns_rr->r.naptr.order;
case ARES_RR_NAPTR_PREFERENCE:
return &dns_rr->r.naptr.preference;
case ARES_RR_NAPTR_FLAGS:
return &dns_rr->r.naptr.flags;
case ARES_RR_NAPTR_SERVICES:
return &dns_rr->r.naptr.services;
case ARES_RR_NAPTR_REGEXP:
return &dns_rr->r.naptr.regexp;
case ARES_RR_NAPTR_REPLACEMENT:
return &dns_rr->r.naptr.replacement;
case ARES_RR_OPT_UDP_SIZE:
return &dns_rr->r.opt.udp_size;
case ARES_RR_OPT_VERSION:
return &dns_rr->r.opt.version;
case ARES_RR_OPT_FLAGS:
return &dns_rr->r.opt.flags;
case ARES_RR_OPT_OPTIONS:
return &dns_rr->r.opt.options;
case ARES_RR_TLSA_CERT_USAGE:
return &dns_rr->r.tlsa.cert_usage;
case ARES_RR_TLSA_SELECTOR:
return &dns_rr->r.tlsa.selector;
case ARES_RR_TLSA_MATCH:
return &dns_rr->r.tlsa.match;
case ARES_RR_TLSA_DATA:
if (lenptr == NULL) {
return NULL;
}
*lenptr = &dns_rr->r.tlsa.data_len;
return &dns_rr->r.tlsa.data;
case ARES_RR_SVCB_PRIORITY:
return &dns_rr->r.svcb.priority;
case ARES_RR_SVCB_TARGET:
return &dns_rr->r.svcb.target;
case ARES_RR_SVCB_PARAMS:
return &dns_rr->r.svcb.params;
case ARES_RR_HTTPS_PRIORITY:
return &dns_rr->r.https.priority;
case ARES_RR_HTTPS_TARGET:
return &dns_rr->r.https.target;
case ARES_RR_HTTPS_PARAMS:
return &dns_rr->r.https.params;
case ARES_RR_URI_PRIORITY:
return &dns_rr->r.uri.priority;
case ARES_RR_URI_WEIGHT:
return &dns_rr->r.uri.weight;
case ARES_RR_URI_TARGET:
return &dns_rr->r.uri.target;
case ARES_RR_CAA_CRITICAL:
return &dns_rr->r.caa.critical;
case ARES_RR_CAA_TAG:
return &dns_rr->r.caa.tag;
case ARES_RR_CAA_VALUE:
if (lenptr == NULL) {
return NULL;
}
*lenptr = &dns_rr->r.caa.value_len;
return &dns_rr->r.caa.value;
case ARES_RR_RAW_RR_TYPE:
return &dns_rr->r.raw_rr.type;
case ARES_RR_RAW_RR_DATA:
if (lenptr == NULL) {
return NULL;
}
*lenptr = &dns_rr->r.raw_rr.length;
return &dns_rr->r.raw_rr.data;
}
return NULL;
}
static const void *ares_dns_rr_data_ptr_const(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key,
const size_t **lenptr)
{
/* We're going to cast off the const */
return ares_dns_rr_data_ptr((void *)((size_t)dns_rr), key,
(void *)((size_t)lenptr));
}
const struct in_addr *ares_dns_rr_get_addr(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
const struct in_addr *addr;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_INADDR) {
return NULL;
}
addr = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (addr == NULL) {
return NULL;
}
return addr;
}
const struct ares_in6_addr *ares_dns_rr_get_addr6(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
const struct ares_in6_addr *addr;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_INADDR6) {
return NULL;
}
addr = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (addr == NULL) {
return NULL;
}
return addr;
}
unsigned char ares_dns_rr_get_u8(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
const unsigned char *u8;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_U8) {
return 0;
}
u8 = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (u8 == NULL) {
return 0;
}
return *u8;
}
unsigned short ares_dns_rr_get_u16(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
const unsigned short *u16;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_U16) {
return 0;
}
u16 = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (u16 == NULL) {
return 0;
}
return *u16;
}
unsigned int ares_dns_rr_get_u32(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
const unsigned int *u32;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_U32) {
return 0;
}
u32 = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (u32 == NULL) {
return 0;
}
return *u32;
}
const unsigned char *ares_dns_rr_get_bin(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key, size_t *len)
{
unsigned char * const *bin = NULL;
size_t const *bin_len = NULL;
if ((ares_dns_rr_key_datatype(key) != ARES_DATATYPE_BIN &&
ares_dns_rr_key_datatype(key) != ARES_DATATYPE_BINP) ||
len == NULL) {
return NULL;
}
bin = ares_dns_rr_data_ptr_const(dns_rr, key, &bin_len);
if (bin == NULL) {
return 0;
}
/* Shouldn't be possible */
if (bin_len == NULL) {
return NULL;
}
*len = *bin_len;
return *bin;
}
const char *ares_dns_rr_get_str(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
char * const *str;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_STR &&
ares_dns_rr_key_datatype(key) != ARES_DATATYPE_NAME) {
return NULL;
}
str = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (str == NULL) {
return NULL;
}
return *str;
}
size_t ares_dns_rr_get_opt_cnt(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key)
{
ares__dns_options_t * const *opts;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_OPT) {
return 0;
}
opts = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (opts == NULL || *opts == NULL) {
return 0;
}
return (*opts)->cnt;
}
unsigned short ares_dns_rr_get_opt(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key, size_t idx,
const unsigned char **val, size_t *val_len)
{
ares__dns_options_t * const *opts;
if (val) {
*val = NULL;
}
if (val_len) {
*val_len = 0;
}
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_OPT) {
return 65535;
}
opts = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (opts == NULL || *opts == NULL) {
return 65535;
}
if (idx >= (*opts)->cnt) {
return 65535;
}
if (val) {
*val = (*opts)->optval[idx].val;
}
if (val_len) {
*val_len = (*opts)->optval[idx].val_len;
}
return (*opts)->optval[idx].opt;
}
ares_bool_t ares_dns_rr_get_opt_byid(const ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key, unsigned short opt,
const unsigned char **val, size_t *val_len)
{
ares__dns_options_t * const *opts;
size_t i;
if (val) {
*val = NULL;
}
if (val_len) {
*val_len = 0;
}
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_OPT) {
return ARES_FALSE;
}
opts = ares_dns_rr_data_ptr_const(dns_rr, key, NULL);
if (opts == NULL || *opts == NULL) {
return ARES_FALSE;
}
for (i = 0; i < (*opts)->cnt; i++) {
if ((*opts)->optval[i].opt == opt) {
break;
}
}
if (i >= (*opts)->cnt) {
return ARES_FALSE;
}
if (val) {
*val = (*opts)->optval[i].val;
}
if (val_len) {
*val_len = (*opts)->optval[i].val_len;
}
return ARES_TRUE;
}
ares_status_t ares_dns_rr_set_addr(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
const struct in_addr *addr)
{
struct in_addr *a;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_INADDR || addr == NULL) {
return ARES_EFORMERR;
}
a = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (a == NULL) {
return ARES_EFORMERR;
}
memcpy(a, addr, sizeof(*a));
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_addr6(ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key,
const struct ares_in6_addr *addr)
{
struct ares_in6_addr *a;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_INADDR6 || addr == NULL) {
return ARES_EFORMERR;
}
a = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (a == NULL) {
return ARES_EFORMERR;
}
memcpy(a, addr, sizeof(*a));
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_u8(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
unsigned char val)
{
unsigned char *u8;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_U8) {
return ARES_EFORMERR;
}
u8 = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (u8 == NULL) {
return ARES_EFORMERR;
}
*u8 = val;
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_u16(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
unsigned short val)
{
unsigned short *u16;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_U16) {
return ARES_EFORMERR;
}
u16 = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (u16 == NULL) {
return ARES_EFORMERR;
}
*u16 = val;
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_u32(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
unsigned int val)
{
unsigned int *u32;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_U32) {
return ARES_EFORMERR;
}
u32 = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (u32 == NULL) {
return ARES_EFORMERR;
}
*u32 = val;
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_bin_own(ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key, unsigned char *val,
size_t len)
{
unsigned char **bin;
size_t *bin_len = NULL;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_BIN &&
ares_dns_rr_key_datatype(key) != ARES_DATATYPE_BINP) {
return ARES_EFORMERR;
}
bin = ares_dns_rr_data_ptr(dns_rr, key, &bin_len);
if (bin == NULL || bin_len == NULL) {
return ARES_EFORMERR;
}
if (*bin) {
ares_free(*bin);
}
*bin = val;
*bin_len = len;
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_bin(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
const unsigned char *val, size_t len)
{
ares_status_t status;
ares_dns_datatype_t datatype = ares_dns_rr_key_datatype(key);
size_t alloclen = (datatype == ARES_DATATYPE_BINP) ? len + 1 : len;
unsigned char *temp = ares_malloc(alloclen);
if (temp == NULL) {
return ARES_ENOMEM;
}
memcpy(temp, val, len);
/* NULL-term BINP */
if (datatype == ARES_DATATYPE_BINP) {
temp[len] = 0;
}
status = ares_dns_rr_set_bin_own(dns_rr, key, temp, len);
if (status != ARES_SUCCESS) {
ares_free(temp);
}
return status;
}
ares_status_t ares_dns_rr_set_str_own(ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key, char *val)
{
char **str;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_STR &&
ares_dns_rr_key_datatype(key) != ARES_DATATYPE_NAME) {
return ARES_EFORMERR;
}
str = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (str == NULL) {
return ARES_EFORMERR;
}
if (*str) {
ares_free(*str);
}
*str = val;
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_str(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
const char *val)
{
ares_status_t status;
char *temp = NULL;
if (val != NULL) {
temp = ares_strdup(val);
if (temp == NULL) {
return ARES_ENOMEM;
}
}
status = ares_dns_rr_set_str_own(dns_rr, key, temp);
if (status != ARES_SUCCESS) {
ares_free(temp);
}
return status;
}
ares_status_t ares_dns_rr_set_opt_own(ares_dns_rr_t *dns_rr,
ares_dns_rr_key_t key, unsigned short opt,
unsigned char *val, size_t val_len)
{
ares__dns_options_t **options;
size_t idx;
if (ares_dns_rr_key_datatype(key) != ARES_DATATYPE_OPT) {
return ARES_EFORMERR;
}
options = ares_dns_rr_data_ptr(dns_rr, key, NULL);
if (options == NULL) {
return ARES_EFORMERR;
}
if (*options == NULL) {
*options = ares_malloc_zero(sizeof(**options));
}
if (*options == NULL) {
return ARES_ENOMEM;
}
for (idx = 0; idx < (*options)->cnt; idx++) {
if ((*options)->optval[idx].opt == opt) {
break;
}
}
/* Duplicate entry, replace */
if (idx != (*options)->cnt) {
goto done;
}
idx = (*options)->cnt;
/* Expand by powers of 2 */
if (idx >= (*options)->alloc) {
size_t alloc_size = (*options)->alloc;
void *temp;
if (alloc_size == 0) {
alloc_size = 1;
} else {
alloc_size <<= 1;
}
temp = ares_realloc_zero((*options)->optval,
(*options)->alloc * sizeof(*(*options)->optval),
alloc_size * sizeof(*(*options)->optval));
if (temp == NULL) {
return ARES_ENOMEM;
}
(*options)->optval = temp;
(*options)->alloc = alloc_size;
}
(*options)->cnt++;
done:
ares_free((*options)->optval[idx].val);
(*options)->optval[idx].opt = opt;
(*options)->optval[idx].val = val;
(*options)->optval[idx].val_len = val_len;
return ARES_SUCCESS;
}
ares_status_t ares_dns_rr_set_opt(ares_dns_rr_t *dns_rr, ares_dns_rr_key_t key,
unsigned short opt, const unsigned char *val,
size_t val_len)
{
unsigned char *temp = NULL;
ares_status_t status;
if (val != NULL) {
temp = ares_malloc(val_len + 1);
if (temp == NULL) {
return ARES_ENOMEM;
}
memcpy(temp, val, val_len);
temp[val_len] = 0;
}
status = ares_dns_rr_set_opt_own(dns_rr, key, opt, temp, val_len);
if (status != ARES_SUCCESS) {
ares_free(temp);
}
return status;
}
char *ares_dns_addr_to_ptr(const struct ares_addr *addr)
{
ares__buf_t *buf = NULL;
const unsigned char *ptr = NULL;
size_t ptr_len = 0;
size_t i;
ares_status_t status;
static const unsigned char hexbytes[] = "0123456789abcdef";
if (addr->family != AF_INET && addr->family != AF_INET6) {
goto fail;
}
buf = ares__buf_create();
if (buf == NULL) {
goto fail;
}
if (addr->family == AF_INET) {
ptr = (const unsigned char *)&addr->addr.addr4;
ptr_len = 4;
} else {
ptr = (const unsigned char *)&addr->addr.addr6;
ptr_len = 16;
}
for (i = ptr_len; i > 0; i--) {
if (addr->family == AF_INET) {
status = ares__buf_append_num_dec(buf, (size_t)ptr[i - 1], 0);
} else {
unsigned char c;
c = ptr[i - 1] & 0xF;
status = ares__buf_append_byte(buf, hexbytes[c]);
if (status != ARES_SUCCESS) {
goto fail;
}
status = ares__buf_append_byte(buf, '.');
if (status != ARES_SUCCESS) {
goto fail;
}
c = (ptr[i - 1] >> 4) & 0xF;
status = ares__buf_append_byte(buf, hexbytes[c]);
}
if (status != ARES_SUCCESS) {
goto fail;
}
status = ares__buf_append_byte(buf, '.');
if (status != ARES_SUCCESS) {
goto fail;
}
}
if (addr->family == AF_INET) {
status = ares__buf_append(buf, (const unsigned char *)"in-addr.arpa", 12);
} else {
status = ares__buf_append(buf, (const unsigned char *)"ip6.arpa", 8);
}
if (status != ARES_SUCCESS) {
goto fail;
}
return ares__buf_finish_str(buf, NULL);
fail:
ares__buf_destroy(buf);
return NULL;
}
/* search for an OPT RR in the response */
ares_bool_t ares_dns_has_opt_rr(const ares_dns_record_t *rec)
{
size_t i;
for (i = 0; i < ares_dns_record_rr_cnt(rec, ARES_SECTION_ADDITIONAL); i++) {
const ares_dns_rr_t *rr =
ares_dns_record_rr_get_const(rec, ARES_SECTION_ADDITIONAL, i);
if (ares_dns_rr_get_type(rr) == ARES_REC_TYPE_OPT) {
return ARES_TRUE;
}
}
return ARES_FALSE;
}
Zerion Mini Shell 1.0