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