src/IOHandler/IOSockets.c

   1 /* IOSockets.c - IOMultiplexer v2
   2  * Copyright (C) 2014  Philipp Kreil (pk910)
   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, see <http://www.gnu.org/licenses/>.
  16  */
  17 #define _IOHandler_internals
  18 #include "IOInternal.h"
  19 #include "IOHandler.h"
  20 #include "IOSockets.h"
  21 #include "IOLog.h"
  22 #include "IODNSLookup.h"
  23
  24 #ifdef WIN32
  25 #define _WIN32_WINNT 0x501
  26 #include <windows.h>
  27 #include <winsock2.h>
  28 #include <ws2tcpip.h>
  29 #else
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <netinet/ip.h>
  33 #include <arpa/inet.h>
  34 #include <unistd.h>
  35 #include <fcntl.h>
  36 #endif
  37 #include "compat/inet.h"
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <signal.h>
  42 #include <errno.h>
  43 #include <stdarg.h>
  44
  45 #ifndef EWOULDBLOCK
  46 #define EWOULDBLOCK EAGAIN
  47 #endif
  48
  49 struct _IOSocket *iosocket_first = NULL;
  50 struct _IOSocket *iosocket_last = NULL;
  51
  52 struct IOEngine *engine = NULL;
  53
  54 static void iosocket_activate(struct _IOSocket *iosock);
  55 static void iosocket_deactivate(struct _IOSocket *iosock);
  56 static void iosocket_increase_buffer(struct IOSocketBuffer *iobuf, size_t required);
  57 static int iosocket_parse_address(const char *hostname, struct IODNSAddress *addr, int records);
  58 static int iosocket_lookup_hostname(struct _IOSocket *iosock, const char *hostname, int records, int bindaddr);
  59 static int iosocket_lookup_apply(struct _IOSocket *iosock, int noip6);
  60 static void socket_lookup_clear(struct _IOSocket *iosock);
  61 static void iosocket_connect_finish(struct _IOSocket *iosock);
  62 static void iosocket_listen_finish(struct _IOSocket *iosock);
  63 static int iosocket_try_write(struct _IOSocket *iosock);
  64 static void iosocket_trigger_event(struct IOSocketEvent *event);
  65
  66 #ifdef WIN32
  67 static int close(int fd) {
  68         return closesocket(fd);
  69 }
  70 #endif
  71
  72 static void iosockets_init_engine() {
  73         //try other engines
  74         if(!engine && engine_kevent.init && engine_kevent.init())
  75                 engine = &engine_kevent;
  76         if(!engine && engine_epoll.init && engine_epoll.init())
  77                 engine = &engine_epoll;
  78         if(!engine && engine_win32.init && engine_win32.init())
  79                 engine = &engine_win32;
  80
  81         if (!engine) {
  82                 if(engine_select.init())
  83                         engine = &engine_select;
  84                 else {
  85                         iolog_trigger(IOLOG_FATAL, "found no useable IO engine");
  86                         return;
  87                 }
  88         }
  89         iolog_trigger(IOLOG_DEBUG, "using %s IOSockets engine", engine->name);
  90 }
  91
  92 void _init_sockets() {
  93         #ifdef WIN32
  94         WSADATA wsaData;
  95     int iResult;
  96         //Initialize Winsock
  97     iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
  98     if(iResult != 0){
  99         iolog_trigger(IOLOG_ERROR, "WSAStartup returned error code: %d", iResult);
 100     }
 101         #endif
 102
 103         iosockets_init_engine();
 104 }
 105
 106
 107 struct _IOSocket *_create_socket() {
 108         struct _IOSocket *iosock = calloc(1, sizeof(*iosock));
 109         if(!iosock) {
 110                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for _IOSocket in %s:%d", __FILE__, __LINE__);
 111                 return NULL;
 112         }
 113         if(iosocket_last)
 114                 iosocket_last->next = iosock;
 115         else
 116                 iosocket_first = iosock;
 117         iosock->prev = iosocket_last;
 118         iosocket_last = iosock;
 119         return iosock;
 120 }
 121
 122 void _free_socket(struct _IOSocket *iosock) {
 123         iosocket_deactivate(iosock);
 124         if(iosock->prev)
 125                 iosock->prev->next = iosock->next;
 126         else
 127                 iosocket_first = iosock->next;
 128         if(iosock->next)
 129                 iosock->next->prev = iosock->prev;
 130         else
 131                 iosocket_last = iosock->prev;
 132
 133         if(iosock->bind.addr.addresslen)
 134                 free(iosock->bind.addr.address);
 135         if(iosock->dest.addr.addresslen)
 136                 free(iosock->dest.addr.address);
 137         if(iosock->bind.addrlookup || iosock->dest.addrlookup)
 138                 socket_lookup_clear(iosock);
 139         if(iosock->readbuf.buffer)
 140                 free(iosock->readbuf.buffer);
 141         if(iosock->writebuf.buffer)
 142                 free(iosock->writebuf.buffer);
 143
 144         free(iosock);
 145 }
 146
 147 static void iosocket_activate(struct _IOSocket *iosock) {
 148         if((iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
 149                 return;
 150         iosock->socket_flags |= IOSOCKETFLAG_ACTIVE;
 151         engine->add(iosock);
 152 }
 153
 154 static void iosocket_deactivate(struct _IOSocket *iosock) {
 155         if(!(iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
 156                 return;
 157         iosock->socket_flags &= ~IOSOCKETFLAG_ACTIVE;
 158         engine->remove(iosock);
 159 }
 160
 161 static void iosocket_increase_buffer(struct IOSocketBuffer *iobuf, size_t required) {
 162         if(iobuf->buflen >= required) return;
 163         char *new_buf;
 164         if(iobuf->buffer)
 165                 new_buf = realloc(iobuf->buffer, required + 2);
 166         else
 167                 new_buf = malloc(required + 2);
 168         if(new_buf) {
 169                 iobuf->buffer = new_buf;
 170                 iobuf->buflen = required;
 171         }
 172 }
 173
 174 static int iosocket_parse_address(const char *hostname, struct IODNSAddress *addr, int records) {
 175         int ret;
 176         if((records & IOSOCKET_ADDR_IPV4)) {
 177                 struct sockaddr_in ip4addr;
 178                 ret = inet_pton(AF_INET, hostname, &(ip4addr.sin_addr));
 179                 if(ret == 1) {
 180                         addr->addresslen = sizeof(ip4addr);
 181                         addr->address = malloc(addr->addresslen);
 182                         if(!addr->address) {
 183                                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 184                                 return -1;
 185                         }
 186                         memcpy(addr->address, &ip4addr, sizeof(ip4addr));
 187                         return 1;
 188                 }
 189         }
 190         if((records & IOSOCKET_ADDR_IPV6)) {
 191                 struct sockaddr_in6 ip6addr;
 192                 ret = inet_pton(AF_INET6, hostname, &(ip6addr.sin6_addr));
 193                 if(ret == 1) {
 194                         addr->addresslen = sizeof(ip6addr);
 195                         addr->address = malloc(addr->addresslen);
 196                         if(!addr->address) {
 197                                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 198                                 return -1;
 199                         }
 200                         memcpy(addr->address, &ip6addr, sizeof(ip6addr));
 201                         return 1;
 202                 }
 203         }
 204         return 0;
 205 }
 206
 207 static int iosocket_lookup_hostname(struct _IOSocket *iosock, const char *hostname, int records, int bindaddr) {
 208         struct IOSocketDNSLookup *lookup = calloc(1, sizeof(*lookup));
 209         if(!lookup) {
 210                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocketDNSLookup in %s:%d", __FILE__, __LINE__);
 211                 return 0;
 212         }
 213
 214         struct _IODNSQuery *query = _create_dnsquery();
 215         if(!query) {
 216                 free(lookup);
 217                 return 0;
 218         }
 219
 220         query->parent = lookup;
 221         query->flags |= IODNSFLAG_PARENT_SOCKET;
 222         lookup->iosocket = iosock;
 223         lookup->query = query;
 224         strncpy(lookup->hostname, hostname, sizeof(lookup->hostname));
 225         lookup->hostname[sizeof(lookup->hostname)-1] = 0;
 226         if(bindaddr) {
 227                 lookup->bindlookup = 1;
 228                 iosock->bind.addrlookup = lookup;
 229         } else {
 230                 lookup->bindlookup = 0;
 231                 iosock->dest.addrlookup = lookup;
 232         }
 233
 234         int dnsrecords = 0;
 235         if((records & IOSOCKET_ADDR_IPV4))
 236                 dnsrecords |= IODNS_RECORD_A;
 237         if((records & IOSOCKET_ADDR_IPV6))
 238                 dnsrecords |= IODNS_RECORD_AAAA;
 239
 240         query->request.host = strdup(hostname);
 241         query->type = (dnsrecords & IODNS_FORWARD);
 242
 243         _start_dnsquery(query);
 244         return 1;
 245 }
 246
 247 void iosocket_lookup_callback(struct IOSocketDNSLookup *lookup, struct IODNSEvent *event) {
 248         lookup->query = NULL;
 249         struct _IOSocket *iosock = lookup->iosocket;
 250         if(iosock == NULL)
 251                 return;
 252
 253         if(event->type == IODNSEVENT_SUCCESS)
 254                 lookup->result = event->result;
 255         else
 256                 lookup->result = NULL;
 257
 258         if(lookup->bindlookup) {
 259                 iosock->socket_flags &= ~IOSOCKETFLAG_PENDING_BINDDNS;
 260                 iosock->socket_flags |= IOSOCKETFLAG_DNSDONE_BINDDNS;
 261         } else {
 262                 iosock->socket_flags &= ~IOSOCKETFLAG_PENDING_DESTDNS;
 263                 iosock->socket_flags |= IOSOCKETFLAG_DNSDONE_DESTDNS;
 264         }
 265
 266         int dns_finished = 0;
 267         if((iosock->socket_flags & (IOSOCKETFLAG_PENDING_BINDDNS | IOSOCKETFLAG_PENDING_DESTDNS)) == 0)
 268                 dns_finished = 1;
 269
 270         if(dns_finished) {
 271                 int ret;
 272                 ret = iosocket_lookup_apply(iosock, 0);
 273                 if(ret) { //if ret=0 an error occured in iosocket_lookup_apply and we should stop here.
 274                         if((iosock->socket_flags & IOSOCKETFLAG_LISTENING)) {
 275                                 socket_lookup_clear(iosock);
 276                                 iosocket_listen_finish(iosock);
 277                         } else
 278                                 iosocket_connect_finish(iosock);
 279                 }
 280         }
 281 }
 282
 283 static int iosocket_lookup_apply(struct _IOSocket *iosock, int noip6) {
 284         char errbuf[512];
 285         struct IOSocketDNSLookup *bind_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_BINDDNS) ? iosock->bind.addrlookup : NULL);
 286         struct IOSocketDNSLookup *dest_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_DESTDNS) ? iosock->dest.addrlookup : NULL);
 287
 288         iolog_trigger(IOLOG_DEBUG, "all pending lookups finished. trying to apply lookup results...");
 289
 290         if(!bind_lookup && !dest_lookup) {
 291                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 292                 sprintf(errbuf, "Internal Error");
 293                 iolog_trigger(IOLOG_ERROR, "trying to apply lookup results without any lookups processed in %s:%d", __FILE__, __LINE__);
 294                 goto iosocket_lookup_apply_end;
 295         }
 296
 297         struct IODNSResult *result;
 298         int bind_numip4 = 0, bind_numip6 = 0;
 299         int dest_numip4 = 0, dest_numip6 = 0;
 300
 301         if(bind_lookup) {
 302                 for(result = bind_lookup->result; result; result = result->next) {
 303                         if((result->type & IODNS_RECORD_A))
 304                                 bind_numip4++;
 305                         if((result->type & IODNS_RECORD_AAAA))
 306                                 bind_numip6++;
 307                 }
 308         }
 309         if(dest_lookup) {
 310                 for(result = dest_lookup->result; result; result = result->next) {
 311                         if((result->type & IODNS_RECORD_A))
 312                                 dest_numip4++;
 313                         if((result->type & IODNS_RECORD_AAAA))
 314                                 dest_numip6++;
 315                 }
 316         }
 317         int useip6 = 0;
 318         int useip4 = 0;
 319         if(bind_lookup && (bind_numip6 == 0 && bind_numip4 == 0)) {
 320                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 321                 sprintf(errbuf, "could not lookup bind address (%s)", bind_lookup->hostname);
 322                 goto iosocket_lookup_apply_end;
 323         } else if(dest_lookup && (dest_numip6 == 0 && dest_numip4 == 0)) {
 324                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 325                 sprintf(errbuf, "could not lookup destination address (%s)", dest_lookup->hostname);
 326                 goto iosocket_lookup_apply_end;
 327         } else if(bind_lookup && dest_lookup) {
 328                 if(bind_numip6 > 0 && dest_numip6 > 0)
 329                         useip6 = 1;
 330                 if(bind_numip4 > 0 && dest_numip4 > 0)
 331                         useip4 = 1;
 332         } else if(bind_lookup) {
 333                 if(bind_numip6)
 334                         useip6 = 1;
 335                 if(bind_numip4)
 336                         useip4 = 1;
 337         } else if(dest_lookup) {
 338                 if(dest_numip6)
 339                         useip6 = 1;
 340                 if(dest_numip4)
 341                         useip4 = 1;
 342         }
 343
 344         int usetype = 0;
 345         if(useip6 && !noip6) {
 346                 usetype = IODNS_RECORD_AAAA;
 347                 iosock->socket_flags |= IOSOCKETFLAG_IPV6SOCKET;
 348                 if(useip4)
 349                         iosock->socket_flags |= IOSOCKETFLAG_RECONNECT_IPV4;
 350         } else if(useip4) {
 351                 usetype = IODNS_RECORD_A;
 352                 iosock->socket_flags &= ~(IOSOCKETFLAG_IPV6SOCKET | IOSOCKETFLAG_RECONNECT_IPV4);
 353         } else {
 354                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 355                 sprintf(errbuf, "could not lookup adresses of the same IP family for bind and destination host. (bind: %d ip4, %d ip6 | dest: %d ip4, %d ip6)", bind_numip4, bind_numip6, dest_numip4, dest_numip6);
 356                 goto iosocket_lookup_apply_end;
 357         }
 358
 359         #define IOSOCKET_APPLY_COPYADDR(type) \
 360         iosock->type.addr.addresslen = result->result.addr.addresslen; \
 361         iosock->type.addr.address = malloc(result->result.addr.addresslen); \
 362         if(!iosock->type.addr.address) { \
 363                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__); \
 364                 iosock->type.addr.addresslen = 0; \
 365                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR; \
 366                 sprintf(errbuf, "could not allocate memory for dns information"); \
 367                 goto iosocket_lookup_apply_end; \
 368         } \
 369         memcpy(iosock->type.addr.address, result->result.addr.address, result->result.addr.addresslen);
 370
 371
 372         if(bind_lookup) {
 373                 int usenum = ((usetype == IODNS_RECORD_AAAA) ? bind_numip6 : bind_numip4);
 374                 usenum = rand() % usenum;
 375                 for(result = bind_lookup->result; result; result = result->next) {
 376                         if((result->type & usetype)) {
 377                                 if(usenum == 0) {
 378                                         inet_ntop(((usetype == IODNS_RECORD_AAAA) ? AF_INET6 : AF_INET), ((usetype == IODNS_RECORD_AAAA) ? (void *)(&((struct sockaddr_in6 *)result->result.addr.address)->sin6_addr) : (void *)(&((struct sockaddr_in *)result->result.addr.address)->sin_addr)), errbuf, sizeof(errbuf));
 379                                         iolog_trigger(IOLOG_DEBUG, "using IPv%s Address (%s) as bind address", ((usetype == IODNS_RECORD_AAAA) ? "6" : "4"), errbuf);
 380                                         IOSOCKET_APPLY_COPYADDR(bind)
 381                                         break;
 382                                 }
 383                                 usenum--;
 384                         }
 385                 }
 386         } else
 387                 iosock->bind.addr.addresslen = 0;
 388
 389         if(dest_lookup) {
 390                 int usenum = ((usetype == IODNS_RECORD_AAAA) ? dest_numip6 : dest_numip4);
 391                 usenum = rand() % usenum;
 392                 for(result = dest_lookup->result; result; result = result->next) {
 393                         if((result->type & usetype)) {
 394                                 if(usenum == 0) {
 395                                         inet_ntop(((usetype == IODNS_RECORD_AAAA) ? AF_INET6 : AF_INET), ((usetype == IODNS_RECORD_AAAA) ? (void *)(&((struct sockaddr_in6 *)result->result.addr.address)->sin6_addr) : (void *)(&((struct sockaddr_in *)result->result.addr.address)->sin_addr)), errbuf, sizeof(errbuf));
 396                                         iolog_trigger(IOLOG_DEBUG, "using IPv%s Address (%s) as dest address", ((usetype == IODNS_RECORD_AAAA) ? "6" : "4"), errbuf);
 397                                         IOSOCKET_APPLY_COPYADDR(dest)
 398                                         break;
 399                                 }
 400                                 usenum--;
 401                         }
 402                 }
 403         } else
 404                 iosock->dest.addr.addresslen = 0;
 405
 406         iosocket_lookup_apply_end:
 407
 408         if((iosock->socket_flags & IOSOCKETFLAG_DNSERROR)) {
 409                 // TODO: trigger error
 410                 iolog_trigger(IOLOG_ERROR, "error while trying to apply dns lookup information: %s", errbuf);
 411
 412                 if((iosock->socket_flags & IOSOCKETFLAG_PARENT_PUBLIC)) {
 413                         //trigger event
 414                         struct IOSocket *iosocket = iosock->parent;
 415
 416                         struct IOSocketEvent callback_event;
 417                         callback_event.type = IOSOCKETEVENT_DNSFAILED;
 418                         callback_event.socket = iosocket;
 419                         callback_event.data.recv_str = errbuf;
 420                         iosocket_trigger_event(&callback_event);
 421
 422                         iosocket_close(iosocket);
 423                 } else {
 424                         // TODO: IODNS Callback
 425                 }
 426                 return 0;
 427         } else
 428                 return 1;
 429 }
 430
 431 static void socket_lookup_clear(struct _IOSocket *iosock) {
 432         struct IOSocketDNSLookup *bind_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_BINDDNS) ? iosock->bind.addrlookup : NULL);
 433         struct IOSocketDNSLookup *dest_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_DESTDNS) ? iosock->dest.addrlookup : NULL);
 434         if(bind_lookup) {
 435                 if(bind_lookup->result)
 436                         iodns_free_result(bind_lookup->result);
 437                 free(bind_lookup);
 438                 iosock->bind.addrlookup = NULL;
 439         }
 440         if(dest_lookup) {
 441                 if(dest_lookup->result)
 442                         iodns_free_result(dest_lookup->result);
 443                 free(dest_lookup);
 444                 iosock->dest.addrlookup = NULL;
 445         }
 446 }
 447
 448 static void iosocket_prepare_fd(int sockfd) {
 449         // prevent SIGPIPE
 450         #ifndef WIN32
 451         #if defined(SO_NOSIGPIPE)
 452         {
 453                 int set = 1;
 454                 setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&set, sizeof(int));
 455         }
 456         #else
 457         signal(SIGPIPE, SIG_IGN);
 458         #endif
 459         #endif
 460
 461         // make sockfd unblocking
 462         #if defined(F_GETFL)
 463         {
 464                 int fcntl_flags;
 465                 fcntl_flags = fcntl(sockfd, F_GETFL);
 466                 fcntl(sockfd, F_SETFL, fcntl_flags|O_NONBLOCK);
 467                 fcntl_flags = fcntl(sockfd, F_GETFD);
 468                 fcntl(sockfd, F_SETFD, fcntl_flags|FD_CLOEXEC);
 469         }
 470         #elif defined(FIONBIO)
 471         {
 472                 unsigned long ulong = 1;
 473                 ioctlsocket(sockfd, FIONBIO, &ulong);
 474         }
 475         #endif
 476 }
 477
 478 static void iosocket_connect_finish(struct _IOSocket *iosock) {
 479         int sockfd;
 480         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET))
 481                 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
 482         else
 483                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 484         if(sockfd == -1) {
 485                 iolog_trigger(IOLOG_ERROR, "could not create socket in %s:%d", __FILE__, __LINE__);
 486                 // TODO: trigger error
 487
 488                 return;
 489         }
 490
 491         // set port and bind address
 492         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET)) {
 493                 struct sockaddr_in6 *ip6 = (void*) iosock->dest.addr.address;
 494                 ip6->sin6_family = AF_INET6;
 495                 ip6->sin6_port = htons(iosock->port);
 496
 497                 if(iosock->bind.addr.addresslen) {
 498                         struct sockaddr_in6 *ip6bind = (void*) iosock->bind.addr.address;
 499                         ip6bind->sin6_family = AF_INET6;
 500                         ip6bind->sin6_port = htons(0);
 501
 502                         bind(sockfd, (struct sockaddr*)ip6bind, sizeof(*ip6bind));
 503                 }
 504         } else {
 505                 struct sockaddr_in *ip4 = (void*) iosock->dest.addr.address;
 506                 ip4->sin_family = AF_INET;
 507                 ip4->sin_port = htons(iosock->port);
 508
 509                 if(iosock->bind.addr.addresslen) {
 510                         struct sockaddr_in *ip4bind = (void*) iosock->bind.addr.address;
 511                         ip4bind->sin_family = AF_INET;
 512                         ip4bind->sin_port = htons(0);
 513
 514                         bind(sockfd, (struct sockaddr*)ip4bind, sizeof(*ip4bind));
 515                 }
 516         }
 517
 518         iosocket_prepare_fd(sockfd);
 519
 520         int ret = connect(sockfd, iosock->dest.addr.address, iosock->dest.addr.addresslen); //returns EINPROGRESS here (nonblocking)
 521         iolog_trigger(IOLOG_DEBUG, "connecting socket (connect: %d)", ret);
 522
 523         iosock->fd = sockfd;
 524         iosock->socket_flags |= IOSOCKETFLAG_CONNECTING;
 525
 526         iosocket_activate(iosock);
 527 }
 528
 529 static void iosocket_listen_finish(struct _IOSocket *iosock) {
 530         int sockfd;
 531         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET))
 532                 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
 533         else
 534                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 535         if(sockfd == -1) {
 536                 iolog_trigger(IOLOG_ERROR, "could not create socket in %s:%d", __FILE__, __LINE__);
 537                 // TODO: trigger error
 538
 539                 return;
 540         }
 541
 542         // set port and bind address
 543         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET)) {
 544                 struct sockaddr_in6 *ip6bind = (void*) iosock->bind.addr.address;
 545                 ip6bind->sin6_family = AF_INET6;
 546                 ip6bind->sin6_port = htons(0);
 547
 548                 int opt = 1;
 549                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
 550
 551                 bind(sockfd, (struct sockaddr*)ip6bind, sizeof(*ip6bind));
 552         } else {
 553                 struct sockaddr_in *ip4bind = (void*) iosock->bind.addr.address;
 554                 ip4bind->sin_family = AF_INET;
 555                 ip4bind->sin_port = htons(0);
 556
 557                 int opt = 1;
 558                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
 559
 560                 bind(sockfd, (struct sockaddr*)ip4bind, sizeof(*ip4bind));
 561         }
 562
 563         iosocket_prepare_fd(sockfd);
 564
 565         listen(sockfd, 1);
 566         iosock->fd = sockfd;
 567
 568         iosocket_activate(iosock);
 569 }
 570
 571 struct _IOSocket *iosocket_accept_client(struct _IOSocket *iosock) {
 572         struct IOSocket *new_iosocket = calloc(1, sizeof(*new_iosocket));
 573         if(!new_iosocket) {
 574                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocket in %s:%d", __FILE__, __LINE__);
 575                 close(accept(iosock->fd, NULL, 0)); // simply drop connection
 576                 return NULL;
 577         }
 578         struct _IOSocket *new_iosock = _create_socket();
 579         if(!new_iosock) {
 580                 free(new_iosocket);
 581                 close(accept(iosock->fd, NULL, 0)); // simply drop connection
 582                 return NULL;
 583         }
 584         new_iosocket->iosocket = new_iosock;
 585         new_iosocket->status = IOSOCKET_CONNECTED;
 586         new_iosock->parent = new_iosocket;
 587         new_iosock->socket_flags |= IOSOCKETFLAG_PARENT_PUBLIC | IOSOCKETFLAG_INCOMING | (iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET);
 588
 589         struct sockaddr_storage addr;
 590         socklen_t addrlen = sizeof(addr);
 591
 592         //accept client
 593         new_iosock->fd = accept(iosock->fd, (struct sockaddr *)&addr, &addrlen);
 594
 595         //copy remote address
 596         new_iosock->dest.addr.address = malloc(addrlen);
 597         if(!new_iosock->dest.addr.address) {
 598                 close(new_iosock->fd);
 599                 free(new_iosock);
 600                 free(new_iosock);
 601                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 602                 return NULL;
 603         }
 604         memcpy(new_iosock->dest.addr.address, &addr, addrlen);
 605         new_iosock->dest.addr.addresslen = addrlen;
 606
 607         //copy local address
 608         new_iosock->bind.addr.address = malloc(iosock->bind.addr.addresslen);
 609         if(!new_iosock->bind.addr.address) {
 610                 close(new_iosock->fd);
 611                 free(new_iosock);
 612                 free(new_iosock);
 613                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 614                 return NULL;
 615         }
 616         memcpy(new_iosock->bind.addr.address, iosock->bind.addr.address, iosock->bind.addr.addresslen);
 617         new_iosock->bind.addr.addresslen = iosock->bind.addr.addresslen;
 618
 619         //prepare new socket fd
 620         iosocket_prepare_fd(new_iosock->fd);
 621
 622         if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {
 623                 new_iosocket->ssl = 1;
 624                 new_iosock->socket_flags |= IOSOCKETFLAG_SSLSOCKET;
 625                 //TODO: SSL Handshake
 626         }
 627
 628         iosocket_activate(new_iosock);
 629         return new_iosock;
 630 }
 631
 632 /* public functions */
 633
 634 struct IOSocket *iosocket_connect(const char *hostname, unsigned int port, int ssl, const char *bindhost, iosocket_callback *callback) {
 635         return iosocket_connect_flags(hostname, port, ssl, bindhost, callback, (IOSOCKET_ADDR_IPV4 | IOSOCKET_ADDR_IPV6));
 636 }
 637
 638 struct IOSocket *iosocket_connect_flags(const char *hostname, unsigned int port, int ssl, const char *bindhost, iosocket_callback *callback, int flags) {
 639         struct IOSocket *iodescriptor = calloc(1, sizeof(*iodescriptor));
 640         if(!iodescriptor) {
 641                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocket in %s:%d", __FILE__, __LINE__);
 642                 return NULL;
 643         }
 644
 645         struct _IOSocket *iosock = _create_socket();
 646         if(!iosock) {
 647                 free(iodescriptor);
 648                 return NULL;
 649         }
 650
 651         iodescriptor->iosocket = iosock;
 652         iodescriptor->status = IOSOCKET_CONNECTING;
 653         iodescriptor->callback = callback;
 654         iosock->parent = iodescriptor;
 655         iosock->socket_flags |= IOSOCKETFLAG_PARENT_PUBLIC;
 656         iosock->port = port;
 657         if(ssl) {
 658                 iodescriptor->ssl = 1;
 659                 iosock->socket_flags |= IOSOCKETFLAG_SSLSOCKET;
 660         }
 661
 662         if(bindhost) {
 663                 switch(iosocket_parse_address(bindhost, &iosock->bind.addr, flags)) {
 664                 case -1:
 665                         free(iosock);
 666                         return NULL;
 667                 case 0:
 668                         /* start dns lookup */
 669                         iosock->socket_flags |= IOSOCKETFLAG_PENDING_BINDDNS;
 670                         iosocket_lookup_hostname(iosock, bindhost, flags, 1);
 671                         break;
 672                 case 1:
 673                         /* valid address */
 674                         break;
 675                 }
 676         }
 677         switch(iosocket_parse_address(hostname, &iosock->dest.addr, flags)) {
 678         case -1:
 679                 free(iosock);
 680                 return NULL;
 681         case 0:
 682                 /* start dns lookup */
 683                 iosock->socket_flags |= IOSOCKETFLAG_PENDING_DESTDNS;
 684                 iosocket_lookup_hostname(iosock, hostname, flags, 0);
 685                 break;
 686         case 1:
 687                 /* valid address */
 688                 break;
 689         }
 690         if((iosock->socket_flags & (IOSOCKETFLAG_PENDING_BINDDNS | IOSOCKETFLAG_PENDING_DESTDNS)) == 0) {
 691                 iosocket_connect_finish(iosock);
 692         }
 693         return iodescriptor;
 694 }
 695
 696 struct IOSocket *iosocket_listen(const char *hostname, unsigned int port, iosocket_callback *callback) {
 697         return iosocket_listen_flags(hostname, port, callback, (IOSOCKET_ADDR_IPV4 | IOSOCKET_ADDR_IPV6));
 698 }
 699
 700 struct IOSocket *iosocket_listen_flags(const char *hostname, unsigned int port, iosocket_callback *callback, int flags) {
 701         struct IOSocket *iodescriptor = calloc(1, sizeof(*iodescriptor));
 702         if(!iodescriptor) {
 703                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocket in %s:%d", __FILE__, __LINE__);
 704                 return NULL;
 705         }
 706
 707         struct _IOSocket *iosock = _create_socket();
 708         if(!iosock) {
 709                 free(iodescriptor);
 710                 return NULL;
 711         }
 712
 713         iodescriptor->iosocket = iosock;
 714         iodescriptor->status = IOSOCKET_LISTENING;
 715         iodescriptor->listening = 1;
 716         iodescriptor->callback = callback;
 717         iosock->parent = iodescriptor;
 718         iosock->socket_flags |= IOSOCKETFLAG_PARENT_PUBLIC | IOSOCKETFLAG_LISTENING;
 719         iosock->port = port;
 720         /*
 721         if(ssl) {
 722                 iodescriptor->ssl = 1;
 723                 iosock->socket_flags |= IOSOCKETFLAG_SSLSOCKET;
 724         }
 725         */
 726
 727         switch(iosocket_parse_address(hostname, &iosock->bind.addr, flags)) {
 728         case -1:
 729                 free(iosock);
 730                 return NULL;
 731         case 0:
 732                 /* start dns lookup */
 733                 iosock->socket_flags |= IOSOCKETFLAG_PENDING_BINDDNS;
 734                 iosocket_lookup_hostname(iosock, hostname, flags, 1);
 735                 break;
 736         case 1:
 737                 /* valid address */
 738                 break;
 739         }
 740         if((iosock->socket_flags & IOSOCKETFLAG_PENDING_BINDDNS) == 0) {
 741                 iosocket_listen_finish(iosock);
 742         }
 743         return iodescriptor;
 744 }
 745
 746 struct IOSocket *iosocket_listen_ssl(const char *hostname, unsigned int port, const char *certfile, const char *keyfile, iosocket_callback *callback) {
 747         return iosocket_listen_ssl_flags(hostname, port, certfile, keyfile, callback, (IOSOCKET_ADDR_IPV4 | IOSOCKET_ADDR_IPV6));
 748 }
 749
 750 struct IOSocket *iosocket_listen_ssl_flags(const char *hostname, unsigned int port, const char *certfile, const char *keyfile, iosocket_callback *callback, int flags) {
 751         //TODO: SSL
 752         return NULL;
 753 }
 754
 755 void iosocket_close(struct IOSocket *iosocket) {
 756         struct _IOSocket *iosock = iosocket->iosocket;
 757         if(iosock == NULL) {
 758                 iolog_trigger(IOLOG_WARNING, "called iosocket_close for destroyed IOSocket in %s:%d", __FILE__, __LINE__);
 759                 return;
 760         }
 761
 762         iosock->socket_flags |= IOSOCKETFLAG_SHUTDOWN;
 763
 764         if(iosock->writebuf.bufpos) {
 765                 //try to send everything before closing
 766 #if defined(F_GETFL)
 767                 {
 768                         int flags;
 769                         flags = fcntl(iosock->fd, F_GETFL);
 770                         fcntl(iosock->fd, F_SETFL, flags & ~O_NONBLOCK);
 771                         flags = fcntl(iosock->fd, F_GETFD);
 772                         fcntl(iosock->fd, F_SETFD, flags|FD_CLOEXEC);
 773                 }
 774 #else
 775                 iosocket_deactivate(iosock);
 776 #endif
 777                 iosocket_try_write(iosock);
 778         }
 779         //close IOSocket
 780         if(iosock->sslnode) {
 781                 //TODO: SSL
 782         }
 783         if(iosock->fd)
 784                 close(iosock->fd);
 785         _free_socket(iosock);
 786         iosocket->iosocket = NULL;
 787         iosocket->status = IOSOCKET_CLOSED;
 788         iogc_add(iosocket);
 789 }
 790
 791 static int iosocket_try_write(struct _IOSocket *iosock) {
 792         if(!iosock->writebuf.bufpos) return 0;
 793         iolog_trigger(IOLOG_DEBUG, "write writebuf (%d bytes) to socket (fd: %d)", iosock->writebuf.bufpos, iosock->fd);
 794         int res;
 795         if(iosock->sslnode) {
 796                 /* res = iohandler_ssl_write(iofd, iofd->writebuf.buffer, iofd->writebuf.bufpos); */
 797                 // TODO
 798         } else
 799                 res = send(iosock->fd, iosock->writebuf.buffer, iosock->writebuf.bufpos, 0);
 800         if(res < 0) {
 801                 if (errno != EAGAIN && errno != EWOULDBLOCK)
 802                         iolog_trigger(IOLOG_ERROR, "could not write to socket (fd: %d): %d - %s", iosock->fd, errno, strerror(errno));
 803                 else
 804                         res = 0;
 805         } else {
 806                 iosock->writebuf.bufpos -= res;
 807                 if((iosock->socket_flags & (IOSOCKETFLAG_ACTIVE & IOSOCKETFLAG_SHUTDOWN)) == IOSOCKETFLAG_ACTIVE)
 808                         engine->update(iosock);
 809         }
 810         return res;
 811 }
 812
 813 void iosocket_send(struct IOSocket *iosocket, const char *data, size_t datalen) {
 814         struct _IOSocket *iosock = iosocket->iosocket;
 815         if(iosock == NULL) {
 816                 iolog_trigger(IOLOG_WARNING, "called iosocket_close for destroyed IOSocket in %s:%d", __FILE__, __LINE__);
 817                 return;
 818         }
 819         if(iosock->socket_flags & IOSOCKETFLAG_SHUTDOWN) {
 820                 iolog_trigger(IOLOG_ERROR, "could not write to socket (socket is closing)");
 821                 return;
 822         }
 823         iolog_trigger(IOLOG_DEBUG, "add %d to writebuf (fd: %d): %s", datalen, iosock->fd, data);
 824         if(iosock->writebuf.buflen < iosock->writebuf.bufpos + datalen) {
 825                 iolog_trigger(IOLOG_DEBUG, "increase writebuf (curr: %d) to %d (+%d bytes)", iosock->writebuf.buflen, iosock->writebuf.bufpos + datalen, (iosock->writebuf.bufpos + datalen - iosock->writebuf.buflen));
 826                 iosocket_increase_buffer(&iosock->writebuf, iosock->writebuf.bufpos + datalen);
 827                 if(iosock->writebuf.buflen < iosock->writebuf.bufpos + datalen) {
 828                         iolog_trigger(IOLOG_ERROR, "increase writebuf (curr: %d) to %d (+%d bytes) FAILED", iosock->writebuf.buflen, iosock->writebuf.bufpos + datalen, (iosock->writebuf.bufpos + datalen - iosock->writebuf.buflen));
 829                         return;
 830                 }
 831         }
 832         memcpy(iosock->writebuf.buffer + iosock->writebuf.bufpos, data, datalen);
 833         iosock->writebuf.bufpos += datalen;
 834         if((iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
 835                 engine->update(iosock);
 836 }
 837
 838 void iosocket_write(struct IOSocket *iosocket, const char *line) {
 839         size_t linelen = strlen(line);
 840         iosocket_send(iosocket, line, linelen);
 841 }
 842
 843 void iosocket_printf(struct IOSocket *iosocket, const char *text, ...) {
 844         va_list arg_list;
 845         char sendBuf[IOSOCKET_PRINTF_LINE_LEN];
 846         int pos;
 847         sendBuf[0] = '\0';
 848         va_start(arg_list, text);
 849         pos = vsnprintf(sendBuf, IOSOCKET_PRINTF_LINE_LEN - 2, text, arg_list);
 850         va_end(arg_list);
 851         if (pos < 0 || pos > (IOSOCKET_PRINTF_LINE_LEN - 2)) pos = IOSOCKET_PRINTF_LINE_LEN - 2;
 852         sendBuf[pos] = '\n';
 853         sendBuf[pos+1] = '\0';
 854         iosocket_send(iosocket, sendBuf, pos+1);
 855 }
 856
 857
 858
 859 static void iosocket_trigger_event(struct IOSocketEvent *event) {
 860         if(!event->socket->callback)
 861                 return;
 862         iolog_trigger(IOLOG_DEBUG, "triggering event");
 863         event->socket->callback(event);
 864 }
 865
 866 void iosocket_events_callback(struct _IOSocket *iosock, int readable, int writeable) {
 867         if((iosock->socket_flags & IOSOCKETFLAG_PARENT_PUBLIC)) {
 868                 struct IOSocket *iosocket = iosock->parent;
 869                 struct IOSocketEvent callback_event;
 870                 callback_event.type = IOSOCKETEVENT_IGNORE;
 871                 callback_event.socket = iosocket;
 872
 873                 if((iosock->socket_flags & IOSOCKETFLAG_SSL_HANDSHAKE)) {
 874                         //TODO: SSL
 875                 } else if((iosock->socket_flags & IOSOCKETFLAG_LISTENING)) {
 876                         if(readable) {
 877                                 //new client connected
 878                                 struct _IOSocket *new_iosock = iosocket_accept_client(iosock);
 879                                 if(!new_iosock)
 880                                         return;
 881
 882                                 if(!(new_iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {
 883                                         callback_event.type = IOSOCKETEVENT_ACCEPT;
 884                                         callback_event.data.accept_socket = new_iosock->parent;
 885                                 }
 886                         }
 887
 888                 } else if((iosock->socket_flags & IOSOCKETFLAG_CONNECTING)) {
 889                         if(readable) { //could not connect
 890                                 if((iosock->socket_flags & (IOSOCKETFLAG_IPV6SOCKET | IOSOCKETFLAG_RECONNECT_IPV4)) == (IOSOCKETFLAG_IPV6SOCKET | IOSOCKETFLAG_RECONNECT_IPV4)) {
 891                                         iolog_trigger(IOLOG_DEBUG, "connecting to IPv6 host (%s) failed. trying to connect using IPv4.", iosock->dest.addrlookup->hostname);
 892                                         iosocket_deactivate(iosock);
 893                                         if(iosocket_lookup_apply(iosock, 1)) { //if ret=0 an error occured in iosocket_lookup_apply and we should stop here.
 894                                                 iosocket_connect_finish(iosock);
 895                                                 socket_lookup_clear(iosock);
 896                                         }
 897                                 } else {
 898                                         callback_event.type = IOSOCKETEVENT_NOTCONNECTED;
 899                                         /*
 900                                         socklen_t arglen = sizeof(callback_event.data.errid);
 901                                         if (getsockopt(iosock->fd, SOL_SOCKET, SO_ERROR, &callback_event.data.errid, &arglen) < 0)
 902                                                 callback_event.data.errid = errno;
 903                                         */
 904                                         iosock->socket_flags |= IOSOCKETFLAG_DEAD;
 905                                 }
 906                         } else if(writeable) { //connection established
 907                                 iosocket->status = IOSOCKET_CONNECTED;
 908                                 if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {
 909                                         //TODO: SSL Handshake
 910                                         return;
 911                                 }
 912
 913                                 callback_event.type = IOSOCKETEVENT_CONNECTED;
 914                                 iosock->socket_flags &= ~IOSOCKETFLAG_CONNECTING;
 915                                 socket_lookup_clear(iosock);
 916                                 engine->update(iosock);
 917
 918                                 //initialize readbuf
 919                                 iosocket_increase_buffer(&iosock->readbuf, 1024);
 920                         }
 921                 } else {
 922                         if(readable) {
 923                                 int bytes;
 924                                 if(iosock->readbuf.buflen - iosock->readbuf.bufpos >= 128)
 925                                         iosocket_increase_buffer(&iosock->readbuf, iosock->readbuf.buflen + 1024);
 926                                 if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {
 927                                         //TODO: SSL read
 928                                 } else
 929                                         bytes = recv(iosock->fd, iosock->readbuf.buffer + iosock->readbuf.bufpos, iosock->readbuf.buflen - iosock->readbuf.bufpos, 0);
 930
 931                                 if(bytes <= 0) {
 932                                         if (errno != EAGAIN || errno != EWOULDBLOCK) {
 933                                                 iosock->socket_flags |= IOSOCKETFLAG_DEAD;
 934
 935                                                 callback_event.type = IOSOCKETEVENT_CLOSED;
 936                                                 callback_event.data.errid = errno;
 937                                         }
 938                                 } else {
 939                                         int i;
 940                                         iolog_trigger(IOLOG_DEBUG, "received %d bytes (fd: %d). readbuf position: %d", bytes, iosock->fd, iosock->readbuf.bufpos);
 941                                         iosock->readbuf.bufpos += bytes;
 942                                         callback_event.type = IOSOCKETEVENT_RECV;
 943
 944                                         if(iosocket->parse_delimiter) {
 945                                                 int j, used_bytes = 0;
 946                                                 for(i = 0; i < iosock->readbuf.bufpos; i++) {
 947                                                         int is_delimiter = 0;
 948                                                         for(j = 0; j < IOSOCKET_PARSE_DELIMITERS_COUNT; j++) {
 949                                                                 if(iosock->readbuf.buffer[i] == iosocket->delimiters[j]) {
 950                                                                         is_delimiter = 1;
 951                                                                         break;
 952                                                                 }
 953                                                         }
 954                                                         if(is_delimiter) {
 955                                                                 iosock->readbuf.buffer[i] = 0;
 956                                                                 callback_event.data.recv_str = iosock->readbuf.buffer + used_bytes;
 957                                                                 iolog_trigger(IOLOG_DEBUG, "parsed line (%d bytes): %s", i - used_bytes, iosock->readbuf.buffer + used_bytes);
 958                                                                 used_bytes = i+1;
 959                                                                 if(iosock->readbuf.buffer[i-1] != 0 || iosocket->parse_empty)
 960                                                                         iosocket_trigger_event(&callback_event);
 961                                                         }
 962                                                         #ifdef IOSOCKET_PARSE_LINE_LIMIT
 963                                                         else if(i + 1 - used_bytes >= IOSOCKET_PARSE_LINE_LIMIT) {
 964                                                                 iosock->readbuf.buffer[i] = 0;
 965                                                                 callback_event.data.recv_str = iosock->readbuf.buffer + used_bytes;
 966                                                                 iolog_trigger(IOLOG_DEBUG, "parsed and stripped line (%d bytes): %s", i - used_bytes, iosock->readbuf.buffer + used_bytes);
 967                                                                 for(; i < iosock->readbuf.bufpos; i++) { //skip the rest of the line
 968                                                                         is_delimiter = 0;
 969                                                                         if(iosock->readbuf.buffer[i] == iosocket->delimiters[j])
 970                                                                                 break;
 971                                                                 }
 972                                                                 used_bytes = i+1;
 973                                                                 iosocket_trigger_event(&callback_event);
 974                                                         }
 975                                                         #endif
 976                                                 }
 977                                                 if(used_bytes) {
 978                                                         if(used_bytes == iosock->readbuf.bufpos) {
 979                                                                 iosock->readbuf.bufpos = 0;
 980                                                                 iolog_trigger(IOLOG_DEBUG, "readbuf fully processed (set buffer position to 0)");
 981                                                         } else {
 982                                                                 iolog_trigger(IOLOG_DEBUG, "readbuf rest: %d bytes (used %d bytes)", iosock->readbuf.bufpos - used_bytes, used_bytes);
 983                                                                 memmove(iosock->readbuf.buffer, iosock->readbuf.buffer + used_bytes, iosock->readbuf.bufpos - used_bytes);
 984                                                                 iosock->readbuf.bufpos -= used_bytes;
 985                                                         }
 986                                                 }
 987                                                 callback_event.type = IOSOCKETEVENT_IGNORE;
 988                                         } else
 989                                                 callback_event.data.recv_buf = &iosock->readbuf;
 990                                 }
 991                         }
 992                         if(writeable) {
 993                                 int bytes;
 994                                 bytes = iosocket_try_write(iosock);
 995                                 if(bytes < 0) {
 996                                         iosock->socket_flags |= IOSOCKETFLAG_DEAD;
 997
 998                                         callback_event.type = IOSOCKETEVENT_CLOSED;
 999                                         callback_event.data.errid = errno;
1000                                 }
1001                         }
1002
1003                 }
1004                 if(callback_event.type != IOSOCKETEVENT_IGNORE)
1005                         iosocket_trigger_event(&callback_event);
1006                 if((iosock->socket_flags & IOSOCKETFLAG_DEAD))
1007                         iosocket_close(iosocket);
1008
1009         } else if((iosock->socket_flags & IOSOCKETFLAG_PARENT_DNSENGINE)) {
1010                 //TODO: IODNS callback
1011         }
1012 }
1013
1014 void iosocket_loop(int usec) {
1015         struct timeval timeout;
1016         timeout.tv_sec = usec / 1000000;
1017         timeout.tv_usec = usec % 1000000;
1018         engine->loop(&timeout);
1019 }