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dyn_resolver_getdns.c
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dyn_resolver_getdns.c
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/*-
* Copyright 2019 UPLEX - Nils Goroll Systemoptimierung
* All rights reserved.
*
* Authors: Nils Goroll <nils.goroll@uplex.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#include <string.h>
//#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#ifdef __FreeBSD__
#include <arpa/inet.h>
#include <netinet/in.h>
#include <resolv.h>
#endif
#include <cache/cache.h>
#include <vsa.h>
#include "vcc_dynamic_if.h"
#include "dyn_resolver.h"
#include "dyn_getdns.h"
/* ------------------------------------------------------------
* getdns resolver
*/
// needs to be first in specific states so a cast works
struct dyn_getdns_common_state {
struct VPFX(dynamic_resolver_context) *context;
getdns_dict *response;
getdns_list *replies;
getdns_list *answers;
size_t n_replies;
size_t n_answers;
size_t reply; // next to return
size_t answer; // next to return
};
struct dyn_getdns_addr_state {
struct dyn_getdns_common_state common;
uint16_t port;
};
#define errchk(ret) if (ret != GETDNS_RETURN_GOOD) return(ret)
#ifdef DUMP_GETDNS
#include <unistd.h>
#define dbg_dump_getdns(r) do { \
char *dbg = getdns_pretty_print_dict(r); \
write(2, dbg, strlen(dbg)); \
free(dbg); \
} while (0)
#else
#define dbg_dump_getdns(r) (void)0
#endif
/* ------------------------------------------------------------
* common
*/
/* look for answer in the next reply */
static int
getdns_common_more_answers(struct dyn_getdns_common_state *state)
{
getdns_return_t ret;
getdns_dict *reply;
if (state->answer < state->n_answers)
return (0);
state->n_answers = state->answer = 0;
if (state->reply >= state->n_replies)
return (GETDNS_RETURN_NO_ANSWERS); // no *more* answers
ret = getdns_list_get_dict(state->replies, state->reply++, &reply);
AZ(ret);
ret = getdns_dict_get_list(reply, "/answer", &state->answers);
AZ(ret);
ret = getdns_list_get_length(state->answers, &state->n_answers);
if (state->n_answers > 0)
return (ret);
return (getdns_common_more_answers(state));
}
static int
getdns_common_lookup_check(struct dyn_getdns_common_state *state)
{
int ret;
uint32_t status;
AN(state);
dbg_dump_getdns(state->response);
ret = getdns_dict_get_int(state->response, "/status", &status);
errchk(ret);
if (status != GETDNS_RESPSTATUS_GOOD)
return (status);
ret = getdns_dict_get_list(state->response,
"/replies_tree", &state->replies);
errchk(ret);
ret = getdns_list_get_length(state->replies,
&state->n_replies);
errchk(ret);
if (state->n_replies == 0)
return (GETDNS_RETURN_NO_ANSWERS);
(void) getdns_common_more_answers(state);
if (state->n_answers == 0)
ret = GETDNS_RETURN_NO_ANSWERS;
return (ret);
}
static void
getdns_common_state_fini(struct dyn_getdns_common_state *state)
{
if (state->response != NULL)
getdns_dict_destroy(state->response);
if (state->context != NULL)
dyn_getdns_rel_context(&state->context);
}
/* ------------------------------------------------------------
* addr
*/
static int
getdns_lookup(struct VPFX(dynamic_resolver) *r,
const char *node, const char *service, void **priv)
{
struct VPFX(dynamic_resolver_context) *c;
struct dyn_getdns_addr_state *addrstate;
struct dyn_getdns_common_state *state;
getdns_return_t ret;
char buf[1024];
struct servent servent_buf[1];
struct servent *servent;
AN(r);
AN(priv);
AZ(*priv);
addrstate = malloc(sizeof *addrstate);
AN(addrstate);
memset(addrstate, 0, sizeof *addrstate);
*priv = addrstate;
state = &addrstate->common;
// XXX tcp hardcoded ok?
addrstate->port = atoi(service);
if (addrstate->port != 0)
addrstate->port = htons(addrstate->port);
else if (getservbyname_r(service, "tcp", servent_buf,
buf, sizeof(buf), &servent) != 0 || servent == NULL)
return (GETDNS_RETURN_NO_SERVBYNAME);
else
addrstate->port = servent->s_port;
c = dyn_getdns_get_context(r);
AN(c);
AN(c->context);
state->context = c;
ret = getdns_address_sync(c->context, node, NULL, &state->response);
errchk(ret);
return (getdns_common_lookup_check(state));
}
static void *getdns_last = &getdns_last;
static struct res_info *
getdns_result(struct res_info *info, void *priv, void **answerp)
{
struct dyn_getdns_addr_state *addrstate;
struct dyn_getdns_common_state *state;
getdns_dict *rr = NULL;
getdns_bindata *addr = NULL;
int ret = -1;
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
AN(info);
AN(priv);
AN(answerp);
if (*answerp == getdns_last)
return (NULL);
addrstate = priv;
state = &addrstate->common;
if (state->answer >= state->n_answers &&
state->reply >= state->n_replies) {
*answerp = getdns_last;
return (NULL);
} else if (*answerp == NULL) {
*answerp = &state->answer;
}
assert(*answerp == &state->answer);
while (getdns_common_more_answers(state) == 0) {
ret = getdns_list_get_dict(state->answers,
state->answer++, &rr);
AZ(ret);
ret = getdns_dict_get_bindata(rr, "/rdata/ipv6_address", &addr);
if (ret == 0)
break;
ret = getdns_dict_get_bindata(rr, "/rdata/ipv4_address", &addr);
if (ret == 0)
break;
}
if (ret != 0) {
*answerp = getdns_last;
return (NULL);
}
AN(rr);
AN(addr);
(void) getdns_dict_get_int(rr, "/ttl", &info->ttl);
/* why dont the getdns folks provide with an interface to
* return a sockaddr ?
*/
switch (addr->size) {
case 4:
assert(sizeof sa4.sin_addr == 4);
memset(&sa4, 0, sizeof sa4);
sa4.sin_family = AF_INET;
sa4.sin_port = addrstate->port;
memcpy(&sa4.sin_addr, addr->data, addr->size);
info->sa = VSA_Build(info->suckbuf, &sa4, sizeof sa4);
break;
case 16:
assert(sizeof sa6.sin6_addr == 16);
memset(&sa6, 0, sizeof sa6);
sa6.sin6_family = AF_INET6;
sa6.sin6_port = addrstate->port;
memcpy(&sa6.sin6_addr, addr->data, addr->size);
info->sa = VSA_Build(info->suckbuf, &sa6, sizeof sa6);
break;
default:
INCOMPL();
}
return (info->sa != NULL ? info : NULL);
}
static void
getdns_fini(void **priv)
{
struct dyn_getdns_addr_state *addrstate;
AN(priv);
addrstate = *priv;
*priv = NULL;
AN(addrstate);
getdns_common_state_fini(&addrstate->common);
free(addrstate);
}
/* ------------------------------------------------------------
* srv
*/
struct dyn_getdns_srv_state {
struct dyn_getdns_common_state common;
};
static int
getdns_srv_lookup(struct VPFX(dynamic_resolver) *r,
const char *service, void **priv)
{
struct VPFX(dynamic_resolver_context) *c;
struct dyn_getdns_srv_state *srvstate;
struct dyn_getdns_common_state *state;
getdns_return_t ret;
AN(r);
AN(service);
AN(priv);
AZ(*priv);
srvstate = malloc(sizeof *srvstate);
AN(srvstate);
memset(srvstate, 0, sizeof *srvstate);
*priv = srvstate;
state = &srvstate->common;
c = dyn_getdns_get_context(r);
AN(c);
AN(c->context);
state->context = c;
ret = getdns_service_sync(c->context, service, NULL, &state->response);
errchk(ret);
return (getdns_common_lookup_check(state));
}
static struct srv_info *
getdns_srv_result(struct srv_info *info, void *priv, void **answerp)
{
struct dyn_getdns_srv_state *srvstate;
struct dyn_getdns_common_state *state;
getdns_dict *rr;
getdns_bindata *target;
uint32_t rrtype;
getdns_return_t ret;
AN(info);
AN(priv);
AN(answerp);
AZ(info->target);
memset(info, 0, sizeof *info);
if (*answerp == getdns_last)
return (NULL);
srvstate = priv;
state = &srvstate->common;
if (state->answer >= state->n_answers &&
state->reply >= state->n_replies) {
*answerp = getdns_last;
return (NULL);
} else if (*answerp == NULL) {
*answerp = &state->answer;
}
assert(*answerp == &state->answer);
while (getdns_common_more_answers(state) == 0) {
ret = getdns_list_get_dict(state->answers,
state->answer++, &rr);
AZ(ret);
ret = getdns_dict_get_int(rr, "type", &rrtype);
if (ret != 0)
continue;
if (rrtype != GETDNS_RRTYPE_SRV)
continue;
// at least target and port must be present
ret = getdns_dict_get_bindata(rr, "/rdata/target", &target);
if (ret != 0)
continue;
ret = getdns_dict_get_int(rr, "/rdata/port", &info->port);
if (ret != 0)
continue;
AZ(getdns_convert_dns_name_to_fqdn(target, &info->target));
(void) getdns_dict_get_int(rr, "/rdata/priority",
&info->priority);
(void) getdns_dict_get_int(rr, "/rdata/weight",
&info->weight);
(void) getdns_dict_get_int(rr, "/ttl", &info->ttl);
return (info);
}
*answerp = getdns_last;
return (NULL);
}
static void
getdns_srv_fini(void **priv)
{
struct dyn_getdns_srv_state *srvstate;
AN(priv);
srvstate = *priv;
*priv = NULL;
AN(srvstate);
getdns_common_state_fini(&srvstate->common);
free(srvstate);
}
static char *
getdns_details(void *priv)
{
struct dyn_getdns_common_state *state = priv;
if (state == NULL || state->response == NULL)
return (NULL);
return (getdns_pretty_print_dict(state->response));
}
const struct res_cb res_getdns = {
.name = "getdns",
.lookup = getdns_lookup,
.result = getdns_result,
.fini = getdns_fini,
.srv_lookup = getdns_srv_lookup,
.srv_result = getdns_srv_result,
.srv_fini = getdns_srv_fini,
.strerror = dyn_getdns_strerror,
.details = getdns_details
};