citadel/modules/c-ares-dns/serv_c-ares-dns.c

   1 /*
   2  * Copyright (c) 1998-2009 by the citadel.org team
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 3 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  *  Inspired by NodeJS.org; thanks for the MX-Parser ;-)
  19  */
  20
  21 #include "sysdep.h"
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <termios.h>
  26 #include <fcntl.h>
  27 #include <signal.h>
  28 #include <pwd.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31 #include <syslog.h>
  32
  33 #if TIME_WITH_SYS_TIME
  34 # include <sys/time.h>
  35 # include <time.h>
  36 #else
  37 # if HAVE_SYS_TIME_H
  38 #  include <sys/time.h>
  39 # else
  40 #  include <time.h>
  41 # endif
  42 #endif
  43 #include <sys/wait.h>
  44 #include <ctype.h>
  45 #include <string.h>
  46 #include <limits.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56
  57 #include "ctdl_module.h"
  58 #include "event_client.h"
  59
  60
  61 extern struct ev_loop *event_base;
  62
  63 void SockStateCb(void *data, int sock, int read, int write);
  64
  65
  66 static void HostByAddrCb(void *data,
  67                          int status,
  68                          int timeouts,
  69                          struct hostent *hostent)
  70 {
  71         AsyncIO *IO = data;
  72         IO->DNSStatus = status;
  73         if  (status != ARES_SUCCESS) {
  74 //              ResolveError(*cb, status);
  75                 return;
  76         }
  77         IO->Data = hostent;
  78 /// TODO: howto free this??
  79 }
  80
  81 static void ParseAnswerA(AsyncIO *IO, unsigned char* abuf, int alen)
  82 {
  83         struct hostent* host;
  84
  85         if (IO->VParsedDNSReply != NULL)
  86                 IO->DNSReplyFree(IO->VParsedDNSReply);
  87         IO->VParsedDNSReply = NULL;
  88
  89         IO->DNSStatus = ares_parse_a_reply(abuf, alen, &host, NULL, NULL);
  90         if (IO->DNSStatus != ARES_SUCCESS) {
  91 //    ResolveError(arg->js_cb, status);
  92                 return;
  93         }
  94         IO->VParsedDNSReply = host;
  95         IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
  96 }
  97
  98
  99 static void ParseAnswerAAAA(AsyncIO *IO, unsigned char* abuf, int alen)
 100 {
 101         struct hostent* host;
 102
 103         if (IO->VParsedDNSReply != NULL)
 104                 IO->DNSReplyFree(IO->VParsedDNSReply);
 105         IO->VParsedDNSReply = NULL;
 106
 107         IO->DNSStatus = ares_parse_aaaa_reply(abuf, alen, &host, NULL, NULL);
 108         if (IO->DNSStatus != ARES_SUCCESS) {
 109 //    ResolveError(arg->js_cb, status);
 110                 return;
 111         }
 112         IO->VParsedDNSReply = host;
 113         IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 114 }
 115
 116
 117 static void ParseAnswerCNAME(AsyncIO *IO, unsigned char* abuf, int alen)
 118 {
 119         struct hostent* host;
 120
 121         if (IO->VParsedDNSReply != NULL)
 122                 IO->DNSReplyFree(IO->VParsedDNSReply);
 123         IO->VParsedDNSReply = NULL;
 124
 125         IO->DNSStatus = ares_parse_a_reply(abuf, alen, &host, NULL, NULL);
 126         if (IO->DNSStatus != ARES_SUCCESS) {
 127 //    ResolveError(arg->js_cb, status);
 128                 return;
 129         }
 130
 131         // a CNAME lookup always returns a single record but
 132         IO->VParsedDNSReply = host;
 133         IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 134 }
 135
 136
 137 static void ParseAnswerMX(AsyncIO *IO, unsigned char* abuf, int alen)
 138 {
 139         struct ares_mx_reply *mx_out;
 140
 141         if (IO->VParsedDNSReply != NULL)
 142                 IO->DNSReplyFree(IO->VParsedDNSReply);
 143         IO->VParsedDNSReply = NULL;
 144
 145         IO->DNSStatus = ares_parse_mx_reply(abuf, alen, &mx_out);
 146         if (IO->DNSStatus != ARES_SUCCESS) {
 147 //    ResolveError(arg->js_cb, status);
 148                 return;
 149         }
 150
 151         IO->VParsedDNSReply = mx_out;
 152         IO->DNSReplyFree = (FreeDNSReply) ares_free_data;
 153 }
 154
 155
 156 static void ParseAnswerNS(AsyncIO *IO, unsigned char* abuf, int alen)
 157 {
 158         struct hostent* host;
 159
 160         if (IO->VParsedDNSReply != NULL)
 161                 IO->DNSReplyFree(IO->VParsedDNSReply);
 162         IO->VParsedDNSReply = NULL;
 163
 164         IO->DNSStatus = ares_parse_ns_reply(abuf, alen, &host);
 165         if (IO->DNSStatus != ARES_SUCCESS) {
 166 //    ResolveError(arg->js_cb, status);
 167                 return;
 168         }
 169         IO->VParsedDNSReply = host;
 170         IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 171 }
 172
 173
 174 static void ParseAnswerSRV(AsyncIO *IO, unsigned char* abuf, int alen)
 175 {
 176         struct ares_srv_reply *srv_out;
 177
 178         if (IO->VParsedDNSReply != NULL)
 179                 IO->DNSReplyFree(IO->VParsedDNSReply);
 180         IO->VParsedDNSReply = NULL;
 181
 182         IO->DNSStatus = ares_parse_srv_reply(abuf, alen, &srv_out);
 183         if (IO->DNSStatus != ARES_SUCCESS) {
 184 //    ResolveError(arg->js_cb, status);
 185                 return;
 186         }
 187
 188         IO->VParsedDNSReply = srv_out;
 189         IO->DNSReplyFree = (FreeDNSReply) ares_free_data;
 190 }
 191
 192
 193 static void ParseAnswerTXT(AsyncIO *IO, unsigned char* abuf, int alen)
 194 {
 195         struct ares_txt_reply *txt_out;
 196
 197         if (IO->VParsedDNSReply != NULL)
 198                 IO->DNSReplyFree(IO->VParsedDNSReply);
 199         IO->VParsedDNSReply = NULL;
 200
 201         IO->DNSStatus = ares_parse_txt_reply(abuf, alen, &txt_out);
 202         if (IO->DNSStatus != ARES_SUCCESS) {
 203 //    ResolveError(arg->js_cb, status);
 204                 return;
 205         }
 206         IO->VParsedDNSReply = txt_out;
 207         IO->DNSReplyFree = (FreeDNSReply) ares_free_data;
 208 }
 209
 210 void QueryCb(void *arg,
 211              int status,
 212              int timeouts,
 213              unsigned char* abuf,
 214              int alen)
 215 {
 216         AsyncIO *IO = arg;
 217
 218         IO->DNSStatus = status;
 219         if (status == ARES_SUCCESS)
 220                 IO->DNS_CB(arg, abuf, alen);
 221 ///     ev_io_stop(event_base, &IO->dns_io_event);
 222
 223         IO->PostDNS(IO);
 224 }
 225
 226
 227 void InitC_ares_dns(AsyncIO *IO)
 228 {
 229         int optmask = 0;
 230         if (IO->DNSChannel == NULL) {
 231                 optmask |= ARES_OPT_SOCK_STATE_CB;
 232                 IO->DNSOptions.sock_state_cb = SockStateCb;
 233                 IO->DNSOptions.sock_state_cb_data = IO;
 234                 ares_init_options(&IO->DNSChannel, &IO->DNSOptions, optmask);
 235         }
 236 }
 237 int QueueQuery(ns_type Type, char *name, AsyncIO *IO, IO_CallBack PostDNS)
 238 {
 239         int length, family;
 240         char address_b[sizeof(struct in6_addr)];
 241
 242         InitC_ares_dns(IO);
 243         IO->PostDNS = PostDNS;
 244         switch(Type) {
 245         case ns_t_a:
 246                 IO->DNS_CB = ParseAnswerA;
 247                 break;
 248
 249         case ns_t_aaaa:
 250                 IO->DNS_CB = ParseAnswerAAAA;
 251                 break;
 252
 253         case ns_t_mx:
 254                 IO->DNS_CB = ParseAnswerMX;
 255                 break;
 256
 257         case ns_t_ns:
 258                 IO->DNS_CB = ParseAnswerNS;
 259                 break;
 260
 261         case ns_t_txt:
 262                 IO->DNS_CB = ParseAnswerTXT;
 263                 break;
 264
 265         case ns_t_srv:
 266                 IO->DNS_CB = ParseAnswerSRV;
 267                 break;
 268
 269         case ns_t_cname:
 270                 IO->DNS_CB = ParseAnswerCNAME;
 271                 break;
 272
 273         case ns_t_ptr:
 274
 275
 276                 if (inet_pton(AF_INET, name, &address_b) == 1) {
 277                         length = sizeof(struct in_addr);
 278                         family = AF_INET;
 279                 } else if (inet_pton(AF_INET6, name, &address_b) == 1) {
 280                         length = sizeof(struct in6_addr);
 281                         family = AF_INET6;
 282                 } else {
 283                         return -1;
 284                 }
 285
 286                 ares_gethostbyaddr(IO->DNSChannel, address_b, length, family, HostByAddrCb, IO);
 287
 288                 return 1;
 289
 290         default:
 291                 return 0;
 292         }
 293         ares_query(IO->DNSChannel, name, ns_c_in, Type, QueryCb, IO);
 294         return 1;
 295 }
 296
 297 static void DNS_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 298 {
 299         AsyncIO *IO = watcher->data;
 300
 301         ares_process_fd(IO->DNSChannel, ARES_SOCKET_BAD, IO->dns_send_event.fd);
 302 }
 303 static void DNS_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 304 {
 305         AsyncIO *IO = watcher->data;
 306
 307         ares_process_fd(IO->DNSChannel, IO->dns_recv_event.fd, ARES_SOCKET_BAD);
 308 }
 309
 310 void SockStateCb(void *data, int sock, int read, int write)
 311 {
 312 /*
 313         struct timeval tvbuf, maxtv, *ret;
 314
 315         int64_t time = 10;
 316 */
 317         AsyncIO *IO = data;
 318 /* already inside of the event queue. */
 319
 320         if (read) {
 321                 if ((IO->dns_recv_event.fd != sock) &&
 322                     (IO->dns_recv_event.fd != 0) &&
 323                     ((IO->active_dns_event & EV_READ) != 0)) {
 324                         ev_io_stop(event_base, &IO->dns_recv_event);
 325                 }
 326                 IO->dns_recv_event.fd = sock;
 327                 ev_io_init(&IO->dns_recv_event, DNS_recv_callback, IO->dns_recv_event.fd, EV_READ);
 328                 IO->dns_recv_event.data = IO;
 329                 ev_io_start(event_base, &IO->dns_recv_event);
 330                 IO->active_dns_event = IO->active_dns_event | EV_READ;
 331         }
 332         if (write) {
 333                 if ((IO->dns_send_event.fd != sock) &&
 334                     (IO->dns_send_event.fd != 0) &&
 335                     ((IO->active_dns_event & EV_WRITE) != 0)) {
 336                         ev_io_stop(event_base, &IO->dns_send_event);
 337                 }
 338                 IO->dns_send_event.fd = sock;
 339                 ev_io_init(&IO->dns_send_event, DNS_send_callback, IO->dns_send_event.fd, EV_WRITE);
 340                 IO->dns_send_event.data = IO;
 341                 ev_io_start(event_base, &IO->dns_send_event);
 342                 IO->active_dns_event = IO->active_dns_event | EV_WRITE;
 343         }
 344 /*
 345
 346                 ev_io_start(event_base, &IO->dns_io_event);
 347
 348                 maxtv.tv_sec = time/1000;
 349                 maxtv.tv_usec = (time % 1000) * 1000;
 350
 351                 ret = ares_timeout(IO->DNSChannel, &maxtv, &tvbuf);
 352         }
 353 */
 354         if ((read == 0) && (write == 0)) {
 355                 if ((IO->active_dns_event & EV_READ) != 0)
 356                         ev_io_stop(event_base, &IO->dns_recv_event);
 357                 if ((IO->active_dns_event & EV_WRITE) != 0)
 358                         ev_io_stop(event_base, &IO->dns_send_event);
 359                 IO->active_dns_event = 0;
 360         }
 361 }
 362
 363 CTDL_MODULE_INIT(c_ares_client)
 364 {
 365         if (!threading)
 366         {
 367                 int r = ares_library_init(ARES_LIB_INIT_ALL);
 368                 if (0 != r) {
 369                         // TODO
 370                         // ThrowException(Exception::Error(String::New(ares_strerror(r))));
 371 ////                    assert(r == 0);
 372                 }
 373         }
 374         return "c-ares";
 375 }