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- /*
- * Copyright (c) 2014, Vsevolod Stakhov
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * 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 AUTHOR ''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 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 <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include <stdarg.h>
-
- #include "rdns.h"
- #include "dns_private.h"
- #include "ottery.h"
- #include "util.h"
- #include "packet.h"
- #include "parse.h"
- #include "logger.h"
- #include "compression.h"
-
- static int
- rdns_send_request (struct rdns_request *req, int fd, bool new_req)
- {
- int r;
- struct rdns_server *serv = req->io->srv;
- struct rdns_resolver *resolver = req->resolver;
- struct rdns_request *tmp;
- struct dns_header *header;
- const int max_id_cycles = 32;
-
- /* Find ID collision */
- if (new_req) {
- r = 0;
- HASH_FIND_INT (req->io->requests, &req->id, tmp);
- while (tmp != NULL) {
- /* Check for unique id */
- header = (struct dns_header *)req->packet;
- header->qid = rdns_permutor_generate_id ();
- req->id = header->qid;
- if (++r > max_id_cycles) {
- return -1;
- }
- HASH_FIND_INT (req->io->requests, &req->id, tmp);
- }
- }
-
- if (resolver->curve_plugin == NULL) {
- r = send (fd, req->packet, req->pos, 0);
- }
- else {
- r = resolver->curve_plugin->cb.curve_plugin.send_cb (req,
- resolver->curve_plugin->data);
- }
- if (r == -1) {
- if (errno == EAGAIN || errno == EINTR) {
- if (new_req) {
- /* Write when socket is ready */
- HASH_ADD_INT (req->io->requests, id, req);
- req->async_event = resolver->async->add_write (resolver->async->data,
- fd, req);
- }
- /*
- * If request is already processed then the calling function
- * should take care about events processing
- */
- return 0;
- }
- else {
- rdns_debug ("send failed: %s for server %s", strerror (errno), serv->name);
- return -1;
- }
- }
-
- if (new_req) {
- /* Add request to hash table */
- HASH_ADD_INT (req->io->requests, id, req);
- /* Fill timeout */
- req->async_event = resolver->async->add_timer (resolver->async->data,
- req->timeout, req);
- req->state = RDNS_REQUEST_SENT;
- }
-
- return 1;
- }
-
-
- static struct rdns_reply *
- rdns_make_reply (struct rdns_request *req, enum dns_rcode rcode)
- {
- struct rdns_reply *rep;
-
- rep = malloc (sizeof (struct rdns_reply));
- if (rep != NULL) {
- rep->request = req;
- rep->resolver = req->resolver;
- rep->entries = NULL;
- rep->code = rcode;
- req->reply = rep;
- }
-
- return rep;
- }
-
- static struct rdns_request *
- rdns_find_dns_request (uint8_t *in, struct rdns_io_channel *ioc)
- {
- struct dns_header *header = (struct dns_header *)in;
- struct rdns_request *req;
- int id;
- struct rdns_resolver *resolver = ioc->resolver;
-
- id = header->qid;
- HASH_FIND_INT (ioc->requests, &id, req);
- if (req == NULL) {
- /* No such requests found */
- rdns_debug ("DNS request with id %d has not been found for IO channel", (int)id);
- }
-
- return req;
- }
-
- static bool
- rdns_parse_reply (uint8_t *in, int r, struct rdns_request *req,
- struct rdns_reply **_rep)
- {
- struct dns_header *header = (struct dns_header *)in;
- struct rdns_reply *rep;
- struct rdns_reply_entry *elt;
- uint8_t *pos, *npos;
- struct rdns_resolver *resolver = req->resolver;
- uint16_t qdcount;
- int type;
- bool found = false;
-
- int i, t;
-
- /* First check header fields */
- if (header->qr == 0) {
- rdns_info ("got request while waiting for reply");
- return false;
- }
-
- qdcount = ntohs (header->qdcount);
-
- if (qdcount != req->qcount) {
- rdns_info ("request has %d queries, reply has %d queries", (int)req->qcount, (int)header->qdcount);
- return false;
- }
-
- /*
- * Now we have request and query data is now at the end of header, so compare
- * request QR section and reply QR section
- */
- req->pos = sizeof (struct dns_header);
- pos = in + sizeof (struct dns_header);
- t = r - sizeof (struct dns_header);
- for (i = 0; i < (int)qdcount; i ++) {
- if ((npos = rdns_request_reply_cmp (req, pos,t)) == NULL) {
- rdns_info ("DNS request with id %d is for different query, ignoring", (int)req->id);
- return false;
- }
- t -= npos - pos;
- pos = npos;
- }
- /*
- * Now pos is in answer section, so we should extract data and form reply
- */
- rep = rdns_make_reply (req, header->rcode);
-
- if (rep == NULL) {
- rdns_warn ("Cannot allocate memory for reply");
- return false;
- }
-
- type = req->requested_names[0].type;
-
- if (rep->code == RDNS_RC_NOERROR) {
- r -= pos - in;
- /* Extract RR records */
- for (i = 0; i < ntohs (header->ancount); i ++) {
- elt = malloc (sizeof (struct rdns_reply_entry));
- t = rdns_parse_rr (resolver, in, elt, &pos, rep, &r);
- if (t == -1) {
- free (elt);
- rdns_debug ("incomplete reply");
- break;
- }
- else if (t == 1) {
- DL_APPEND (rep->entries, elt);
- if (elt->type == type) {
- found = true;
- }
- }
- else {
- rdns_debug ("no matching reply for %s",
- req->requested_names[0].name);
- free (elt);
- }
- }
- }
-
- if (!found && type != RDNS_REQUEST_ANY) {
- /* We have not found the requested RR type */
- rep->code = RDNS_RC_NOREC;
- }
-
- *_rep = rep;
- return true;
- }
-
- static void
- rdns_request_unschedule (struct rdns_request *req)
- {
- req->async->del_timer (req->async->data,
- req->async_event);
- /* Remove from id hashes */
- HASH_DEL (req->io->requests, req);
- }
-
- void
- rdns_process_read (int fd, void *arg)
- {
- struct rdns_io_channel *ioc = arg;
- struct rdns_resolver *resolver;
- struct rdns_request *req = NULL;
- ssize_t r;
- struct rdns_reply *rep;
- uint8_t in[UDP_PACKET_SIZE];
-
- resolver = ioc->resolver;
-
- /* First read packet from socket */
- if (resolver->curve_plugin == NULL) {
- r = read (fd, in, sizeof (in));
- if (r > (int)(sizeof (struct dns_header) + sizeof (struct dns_query))) {
- req = rdns_find_dns_request (in, ioc);
- }
- }
- else {
- r = resolver->curve_plugin->cb.curve_plugin.recv_cb (ioc, in,
- sizeof (in), resolver->curve_plugin->data, &req);
- if (req == NULL &&
- r > (int)(sizeof (struct dns_header) + sizeof (struct dns_query))) {
- req = rdns_find_dns_request (in, ioc);
- }
- }
-
- if (req != NULL) {
- if (rdns_parse_reply (in, r, req, &rep)) {
- UPSTREAM_OK (req->io->srv);
- req->state = RDNS_REQUEST_REPLIED;
- rdns_request_unschedule (req);
- req->func (rep, req->arg);
- REF_RELEASE (req);
- }
- }
- else {
- /* Still want to increase uses */
- ioc->uses ++;
- }
- }
-
- void
- rdns_process_timer (void *arg)
- {
- struct rdns_request *req = (struct rdns_request *)arg;
- struct rdns_reply *rep;
- int r;
- bool renew = false;
- struct rdns_resolver *resolver;
- struct rdns_server *serv = NULL;
-
- req->retransmits --;
- resolver = req->resolver;
-
- if (req->retransmits == 0) {
- UPSTREAM_FAIL (req->io->srv, time (NULL));
- rep = rdns_make_reply (req, RDNS_RC_TIMEOUT);
- req->state = RDNS_REQUEST_REPLIED;
- rdns_request_unschedule (req);
- req->func (rep, req->arg);
- REF_RELEASE (req);
-
- return;
- }
-
- if (!req->io->active) {
- /* Do not reschedule IO requests on inactive sockets */
- rdns_debug ("reschedule request with id: %d", (int)req->id);
- rdns_request_unschedule (req);
- REF_RELEASE (req->io);
-
- UPSTREAM_SELECT_ROUND_ROBIN (resolver->servers, serv);
-
- if (serv == NULL) {
- rdns_warn ("cannot find suitable server for request");
- rep = rdns_make_reply (req, RDNS_RC_SERVFAIL);
- req->state = RDNS_REQUEST_REPLIED;
- req->func (rep, req->arg);
- REF_RELEASE (req);
- }
-
- /* Select random IO channel */
- req->io = serv->io_channels[ottery_rand_uint32 () % serv->io_cnt];
- req->io->uses ++;
- REF_RETAIN (req->io);
- renew = true;
- }
-
- r = rdns_send_request (req, req->io->sock, renew);
- if (r == 0) {
- /* Retransmit one more time */
- req->async->del_timer (req->async->data,
- req->async_event);
- req->async_event = req->async->add_write (req->async->data,
- req->io->sock, req);
- req->state = RDNS_REQUEST_REGISTERED;
- }
- else if (r == -1) {
- UPSTREAM_FAIL (req->io->srv, time (NULL));
- rep = rdns_make_reply (req, RDNS_RC_NETERR);
- req->state = RDNS_REQUEST_REPLIED;
- rdns_request_unschedule (req);
- req->func (rep, req->arg);
- REF_RELEASE (req);
- }
- else {
- req->async->repeat_timer (req->async->data, req->async_event);
- }
- }
-
- static void
- rdns_process_periodic (void *arg)
- {
- struct rdns_resolver *resolver = (struct rdns_resolver*)arg;
-
- UPSTREAM_RESCAN (resolver->servers, time (NULL));
- }
-
- static void
- rdns_process_ioc_refresh (void *arg)
- {
- struct rdns_resolver *resolver = (struct rdns_resolver*)arg;
- struct rdns_server *serv;
- struct rdns_io_channel *ioc, *nioc;
- unsigned int i;
-
- if (resolver->max_ioc_uses > 0) {
- UPSTREAM_FOREACH (resolver->servers, serv) {
- for (i = 0; i < serv->io_cnt; i ++) {
- ioc = serv->io_channels[i];
- if (ioc->uses > resolver->max_ioc_uses) {
- /* Schedule IOC removing */
- nioc = calloc (1, sizeof (struct rdns_io_channel));
- if (nioc == NULL) {
- rdns_err ("calloc fails to allocate rdns_io_channel");
- continue;
- }
- nioc->sock = rdns_make_client_socket (serv->name, serv->port,
- SOCK_DGRAM);
- if (nioc->sock == -1) {
- rdns_err ("cannot open socket to %s: %s", serv->name,
- strerror (errno));
- free (nioc);
- continue;
- }
- nioc->srv = serv;
- nioc->active = true;
- nioc->resolver = resolver;
- nioc->async_io = resolver->async->add_read (resolver->async->data,
- nioc->sock, nioc);
- REF_INIT_RETAIN (nioc, rdns_ioc_free);
- serv->io_channels[i] = nioc;
- rdns_debug ("scheduled io channel for server %s to be refreshed after "
- "%lu usages", serv->name, (unsigned long)ioc->uses);
- ioc->active = false;
- REF_RELEASE (ioc);
- }
- }
- }
- }
- }
-
- void
- rdns_process_retransmit (int fd, void *arg)
- {
- struct rdns_request *req = (struct rdns_request *)arg;
- struct rdns_resolver *resolver;
- struct rdns_reply *rep;
- int r;
-
- resolver = req->resolver;
-
- resolver->async->del_write (resolver->async->data,
- req->async_event);
-
- r = rdns_send_request (req, fd, false);
-
- if (r == 0) {
- /* Retransmit one more time */
- req->async_event = req->async->add_write (req->async->data,
- fd, req);
- req->state = RDNS_REQUEST_REGISTERED;
- }
- else if (r == -1) {
- UPSTREAM_FAIL (req->io->srv, time (NULL));
- rep = rdns_make_reply (req, RDNS_RC_NETERR);
- req->state = RDNS_REQUEST_REPLIED;
- req->func (rep, req->arg);
- REF_RELEASE (req);
- }
- else {
- req->async_event = req->async->add_timer (req->async->data,
- req->timeout, req);
- req->state = RDNS_REQUEST_SENT;
- }
- }
-
- struct rdns_request*
- rdns_make_request_full (
- struct rdns_resolver *resolver,
- dns_callback_type cb,
- void *cbdata,
- double timeout,
- unsigned int repeats,
- unsigned int queries,
- ...
- )
- {
- va_list args;
- struct rdns_request *req;
- struct rdns_server *serv;
- int r, type;
- unsigned int i, tlen = 0, clen = 0, cur;
- size_t olen;
- const char *cur_name, *last_name = NULL;
- struct rdns_compression_entry *comp = NULL;
-
- if (!resolver->initialized) {
- return NULL;
- }
-
- req = malloc (sizeof (struct rdns_request));
- if (req == NULL) {
- return NULL;
- }
-
- req->resolver = resolver;
- req->func = cb;
- req->arg = cbdata;
- req->reply = NULL;
- req->qcount = queries;
- req->io = NULL;
- req->state = RDNS_REQUEST_NEW;
- req->packet = NULL;
- req->requested_names = calloc (queries, sizeof (struct rdns_request_name));
- if (req->requested_names == NULL) {
- free (req);
- return NULL;
- }
-
- req->type = 0;
- #ifdef TWEETNACL
- req->curve_plugin_data = NULL;
- #endif
- REF_INIT_RETAIN (req, rdns_request_free);
-
- /* Calculate packet's total length based on records count */
- va_start (args, queries);
- for (i = 0; i < queries * 2; i += 2) {
- cur = i / 2;
- cur_name = va_arg (args, const char *);
- if (cur_name != NULL) {
- last_name = cur_name;
- clen = strlen (cur_name);
- if (clen == 0) {
- rdns_info ("got empty name to resolve");
- rdns_request_free (req);
- return NULL;
- }
- tlen += clen;
- }
- else if (last_name == NULL) {
- rdns_info ("got NULL as the first name to resolve");
- rdns_request_free (req);
- return NULL;
- }
-
- if (!rdns_format_dns_name (resolver, last_name, clen,
- &req->requested_names[cur].name, &olen)) {
- rdns_request_free (req);
- return NULL;
- }
-
- type = va_arg (args, int);
- req->requested_names[cur].type = type;
- req->requested_names[cur].len = olen;
- }
- va_end (args);
-
- rdns_allocate_packet (req, tlen);
- rdns_make_dns_header (req, queries);
-
- for (i = 0; i < queries; i ++) {
- cur_name = req->requested_names[i].name;
- clen = req->requested_names[i].len;
- type = req->requested_names[i].type;
- if (queries > 1) {
- if (!rdns_add_rr (req, cur_name, clen, type, &comp)) {
- REF_RELEASE (req);
- rnds_compression_free (comp);
- return NULL;
- }
- }
- else {
- if (!rdns_add_rr (req, cur_name, clen, type, NULL)) {
- REF_RELEASE (req);
- rnds_compression_free (comp);
- return NULL;
- }
- }
- }
-
- rnds_compression_free (comp);
-
- /* Add EDNS RR */
- rdns_add_edns0 (req);
-
- req->retransmits = repeats;
- req->timeout = timeout;
- req->state = RDNS_REQUEST_NEW;
- req->async = resolver->async;
-
- UPSTREAM_SELECT_ROUND_ROBIN (resolver->servers, serv);
-
- if (serv == NULL) {
- rdns_warn ("cannot find suitable server for request");
- REF_RELEASE (req);
- return NULL;
- }
-
- /* Select random IO channel */
- req->io = serv->io_channels[ottery_rand_uint32 () % serv->io_cnt];
- req->io->uses ++;
-
- /* Now send request to server */
- r = rdns_send_request (req, req->io->sock, true);
-
- if (r == -1) {
- REF_RELEASE (req);
- return NULL;
- }
-
- REF_RETAIN (req->io);
- REF_RETAIN (req->resolver);
-
- return req;
- }
-
- bool
- rdns_resolver_init (struct rdns_resolver *resolver)
- {
- unsigned int i;
- struct rdns_server *serv;
- struct rdns_io_channel *ioc;
-
- if (!resolver->async_binded) {
- return false;
- }
-
- if (resolver->servers == NULL) {
- return false;
- }
-
- /* Now init io channels to all servers */
- UPSTREAM_FOREACH (resolver->servers, serv) {
- serv->io_channels = calloc (serv->io_cnt, sizeof (struct rdns_io_channel *));
- for (i = 0; i < serv->io_cnt; i ++) {
- ioc = calloc (1, sizeof (struct rdns_io_channel));
- if (ioc == NULL) {
- rdns_err ("cannot allocate memory for the resolver");
- return false;
- }
- ioc->sock = rdns_make_client_socket (serv->name, serv->port, SOCK_DGRAM);
- ioc->active = true;
- if (ioc->sock == -1) {
- rdns_err ("cannot open socket to %s:%d %s", serv->name, serv->port, strerror (errno));
- free (ioc);
- return false;
- }
- else {
- ioc->srv = serv;
- ioc->resolver = resolver;
- ioc->async_io = resolver->async->add_read (resolver->async->data,
- ioc->sock, ioc);
- REF_INIT_RETAIN (ioc, rdns_ioc_free);
- serv->io_channels[i] = ioc;
- }
- }
- }
-
- if (resolver->async->add_periodic) {
- resolver->periodic = resolver->async->add_periodic (resolver->async->data,
- UPSTREAM_REVIVE_TIME, rdns_process_periodic, resolver);
- }
-
- resolver->initialized = true;
-
- return true;
- }
-
- void
- rdns_resolver_register_plugin (struct rdns_resolver *resolver,
- struct rdns_plugin *plugin)
- {
- if (resolver != NULL && plugin != NULL) {
- /* XXX: support only network plugin now, and only a single one */
- if (plugin->type == RDNS_PLUGIN_CURVE) {
- resolver->curve_plugin = plugin;
- }
- }
- }
-
- bool
- rdns_resolver_add_server (struct rdns_resolver *resolver,
- const char *name, unsigned int port,
- int priority, unsigned int io_cnt)
- {
- struct rdns_server *serv;
- union {
- struct in_addr v4;
- struct in6_addr v6;
- } addr;
-
- if (inet_pton (AF_INET, name, &addr) == 0 &&
- inet_pton (AF_INET6, name, &addr) == 0) {
- /* Invalid IP */
- return false;
- }
-
- if (io_cnt == 0) {
- return false;
- }
- if (port == 0 || port > UINT16_MAX) {
- return false;
- }
-
- serv = calloc (1, sizeof (struct rdns_server));
- if (serv == NULL) {
- return false;
- }
- serv->name = strdup (name);
- if (serv->name == NULL) {
- free (serv);
- return false;
- }
-
- serv->io_cnt = io_cnt;
- serv->port = port;
-
- UPSTREAM_ADD (resolver->servers, serv, priority);
-
- return true;
- }
-
- void
- rdns_resolver_set_logger (struct rdns_resolver *resolver,
- rdns_log_function logger, void *log_data)
- {
- resolver->logger = logger;
- resolver->log_data = log_data;
- }
-
- void
- rdns_resolver_set_log_level (struct rdns_resolver *resolver,
- enum rdns_log_level level)
- {
- resolver->log_level = level;
- }
-
-
- void
- rdns_resolver_set_max_io_uses (struct rdns_resolver *resolver,
- uint64_t max_ioc_uses, double check_time)
- {
- if (resolver->refresh_ioc_periodic != NULL) {
- resolver->async->del_periodic (resolver->async->data,
- resolver->refresh_ioc_periodic);
- resolver->refresh_ioc_periodic = NULL;
- }
-
- resolver->max_ioc_uses = max_ioc_uses;
- if (check_time > 0.0 && resolver->async->add_periodic) {
- resolver->refresh_ioc_periodic =
- resolver->async->add_periodic (resolver->async->data,
- check_time, rdns_process_ioc_refresh, resolver);
- }
- }
-
- static void
- rdns_resolver_free (struct rdns_resolver *resolver)
- {
- struct rdns_server *serv, *stmp;
- struct rdns_io_channel *ioc;
- unsigned int i;
-
- if (resolver->initialized) {
- if (resolver->periodic != NULL) {
- resolver->async->del_periodic (resolver->async->data, resolver->periodic);
- }
- if (resolver->refresh_ioc_periodic != NULL) {
- resolver->async->del_periodic (resolver->async->data,
- resolver->refresh_ioc_periodic);
- }
- if (resolver->curve_plugin != NULL && resolver->curve_plugin->dtor != NULL) {
- resolver->curve_plugin->dtor (resolver, resolver->curve_plugin->data);
- }
- /* Stop IO watch on all IO channels */
- UPSTREAM_FOREACH_SAFE (resolver->servers, serv, stmp) {
- for (i = 0; i < serv->io_cnt; i ++) {
- ioc = serv->io_channels[i];
- REF_RELEASE (ioc);
- }
- serv->io_cnt = 0;
- UPSTREAM_DEL (resolver->servers, serv);
- free (serv->io_channels);
- free (serv->name);
- free (serv);
- }
- }
- free (resolver->async);
- free (resolver);
- }
-
-
- struct rdns_resolver *
- rdns_resolver_new (void)
- {
- struct rdns_resolver *new;
-
- new = calloc (1, sizeof (struct rdns_resolver));
-
- REF_INIT_RETAIN (new, rdns_resolver_free);
-
- new->logger = rdns_logger_internal;
- new->log_data = new;
-
- return new;
- }
-
- void
- rdns_resolver_async_bind (struct rdns_resolver *resolver,
- struct rdns_async_context *ctx)
- {
- if (resolver != NULL && ctx != NULL) {
- resolver->async = ctx;
- resolver->async_binded = true;
- }
- }
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