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();\r
 104         iossl_init();
 105 }
 106
 107
 108 struct _IOSocket *_create_socket() {
 109         struct _IOSocket *iosock = calloc(1, sizeof(*iosock));
 110         if(!iosock) {
 111                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for _IOSocket in %s:%d", __FILE__, __LINE__);
 112                 return NULL;
 113         }
 114         if(iosocket_last)
 115                 iosocket_last->next = iosock;
 116         else
 117                 iosocket_first = iosock;
 118         iosock->prev = iosocket_last;
 119         iosocket_last = iosock;
 120         return iosock;
 121 }
 122
 123 void _free_socket(struct _IOSocket *iosock) {
 124         iosocket_deactivate(iosock);
 125         if(iosock->prev)
 126                 iosock->prev->next = iosock->next;
 127         else
 128                 iosocket_first = iosock->next;
 129         if(iosock->next)
 130                 iosock->next->prev = iosock->prev;
 131         else
 132                 iosocket_last = iosock->prev;
 133
 134         if(iosock->bind.addr.addresslen)
 135                 free(iosock->bind.addr.address);
 136         if(iosock->dest.addr.addresslen)
 137                 free(iosock->dest.addr.address);
 138         if(iosock->bind.addrlookup || iosock->dest.addrlookup)
 139                 socket_lookup_clear(iosock);
 140         if(iosock->readbuf.buffer)
 141                 free(iosock->readbuf.buffer);
 142         if(iosock->writebuf.buffer)
 143                 free(iosock->writebuf.buffer);
 144         if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET))\r
 145                 iossl_disconnect(iosock);\r
 146
 147         free(iosock);
 148 }
 149
 150 static void iosocket_activate(struct _IOSocket *iosock) {
 151         if((iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
 152                 return;
 153         iosock->socket_flags |= IOSOCKETFLAG_ACTIVE;
 154         engine->add(iosock);
 155 }
 156
 157 static void iosocket_deactivate(struct _IOSocket *iosock) {
 158         if(!(iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
 159                 return;
 160         iosock->socket_flags &= ~IOSOCKETFLAG_ACTIVE;
 161         engine->remove(iosock);
 162 }
 163
 164 static void iosocket_increase_buffer(struct IOSocketBuffer *iobuf, size_t required) {
 165         if(iobuf->buflen >= required) return;
 166         char *new_buf;
 167         if(iobuf->buffer)
 168                 new_buf = realloc(iobuf->buffer, required + 2);
 169         else
 170                 new_buf = malloc(required + 2);
 171         if(new_buf) {
 172                 iobuf->buffer = new_buf;
 173                 iobuf->buflen = required;
 174         }
 175 }
 176
 177 static int iosocket_parse_address(const char *hostname, struct IODNSAddress *addr, int records) {
 178         int ret;
 179         if((records & IOSOCKET_ADDR_IPV4)) {
 180                 struct sockaddr_in ip4addr;
 181                 ret = inet_pton(AF_INET, hostname, &(ip4addr.sin_addr));
 182                 if(ret == 1) {
 183                         addr->addresslen = sizeof(ip4addr);
 184                         addr->address = malloc(addr->addresslen);
 185                         if(!addr->address) {
 186                                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 187                                 return -1;
 188                         }
 189                         memcpy(addr->address, &ip4addr, sizeof(ip4addr));
 190                         return 1;
 191                 }
 192         }
 193         if((records & IOSOCKET_ADDR_IPV6)) {
 194                 struct sockaddr_in6 ip6addr;
 195                 ret = inet_pton(AF_INET6, hostname, &(ip6addr.sin6_addr));
 196                 if(ret == 1) {
 197                         addr->addresslen = sizeof(ip6addr);
 198                         addr->address = malloc(addr->addresslen);
 199                         if(!addr->address) {
 200                                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 201                                 return -1;
 202                         }
 203                         memcpy(addr->address, &ip6addr, sizeof(ip6addr));
 204                         return 1;
 205                 }
 206         }
 207         return 0;
 208 }
 209
 210 static int iosocket_lookup_hostname(struct _IOSocket *iosock, const char *hostname, int records, int bindaddr) {
 211         struct IOSocketDNSLookup *lookup = calloc(1, sizeof(*lookup));
 212         if(!lookup) {
 213                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocketDNSLookup in %s:%d", __FILE__, __LINE__);
 214                 return 0;
 215         }
 216
 217         struct _IODNSQuery *query = _create_dnsquery();
 218         if(!query) {
 219                 free(lookup);
 220                 return 0;
 221         }
 222
 223         query->parent = lookup;
 224         query->flags |= IODNSFLAG_PARENT_SOCKET;
 225         lookup->iosocket = iosock;
 226         lookup->query = query;
 227         strncpy(lookup->hostname, hostname, sizeof(lookup->hostname));
 228         lookup->hostname[sizeof(lookup->hostname)-1] = 0;
 229         if(bindaddr) {
 230                 lookup->bindlookup = 1;
 231                 iosock->bind.addrlookup = lookup;
 232         } else {
 233                 lookup->bindlookup = 0;
 234                 iosock->dest.addrlookup = lookup;
 235         }
 236
 237         int dnsrecords = 0;
 238         if((records & IOSOCKET_ADDR_IPV4))
 239                 dnsrecords |= IODNS_RECORD_A;
 240         if((records & IOSOCKET_ADDR_IPV6))
 241                 dnsrecords |= IODNS_RECORD_AAAA;
 242
 243         query->request.host = strdup(hostname);
 244         query->type = (dnsrecords & IODNS_FORWARD);
 245
 246         _start_dnsquery(query);
 247         return 1;
 248 }
 249
 250 void iosocket_lookup_callback(struct IOSocketDNSLookup *lookup, struct IODNSEvent *event) {
 251         lookup->query = NULL;
 252         struct _IOSocket *iosock = lookup->iosocket;
 253         if(iosock == NULL)
 254                 return;
 255
 256         if(event->type == IODNSEVENT_SUCCESS)
 257                 lookup->result = event->result;
 258         else
 259                 lookup->result = NULL;
 260
 261         if(lookup->bindlookup) {
 262                 iosock->socket_flags &= ~IOSOCKETFLAG_PENDING_BINDDNS;
 263                 iosock->socket_flags |= IOSOCKETFLAG_DNSDONE_BINDDNS;
 264         } else {
 265                 iosock->socket_flags &= ~IOSOCKETFLAG_PENDING_DESTDNS;
 266                 iosock->socket_flags |= IOSOCKETFLAG_DNSDONE_DESTDNS;
 267         }
 268
 269         int dns_finished = 0;
 270         if((iosock->socket_flags & (IOSOCKETFLAG_PENDING_BINDDNS | IOSOCKETFLAG_PENDING_DESTDNS)) == 0)
 271                 dns_finished = 1;
 272
 273         if(dns_finished) {
 274                 int ret;
 275                 ret = iosocket_lookup_apply(iosock, 0);
 276                 if(ret) { //if ret=0 an error occured in iosocket_lookup_apply and we should stop here.
 277                         if((iosock->socket_flags & IOSOCKETFLAG_LISTENING)) {
 278                                 socket_lookup_clear(iosock);
 279                                 iosocket_listen_finish(iosock);
 280                         } else
 281                                 iosocket_connect_finish(iosock);
 282                 }
 283         }
 284 }
 285
 286 static int iosocket_lookup_apply(struct _IOSocket *iosock, int noip6) {
 287         char errbuf[512];
 288         struct IOSocketDNSLookup *bind_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_BINDDNS) ? iosock->bind.addrlookup : NULL);
 289         struct IOSocketDNSLookup *dest_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_DESTDNS) ? iosock->dest.addrlookup : NULL);
 290
 291         iolog_trigger(IOLOG_DEBUG, "all pending lookups finished. trying to apply lookup results...");
 292
 293         if(!bind_lookup && !dest_lookup) {
 294                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 295                 sprintf(errbuf, "Internal Error");
 296                 iolog_trigger(IOLOG_ERROR, "trying to apply lookup results without any lookups processed in %s:%d", __FILE__, __LINE__);
 297                 goto iosocket_lookup_apply_end;
 298         }
 299
 300         struct IODNSResult *result;
 301         int bind_numip4 = 0, bind_numip6 = 0;
 302         int dest_numip4 = 0, dest_numip6 = 0;
 303
 304         if(bind_lookup) {
 305                 for(result = bind_lookup->result; result; result = result->next) {
 306                         if((result->type & IODNS_RECORD_A))
 307                                 bind_numip4++;
 308                         if((result->type & IODNS_RECORD_AAAA))
 309                                 bind_numip6++;
 310                 }
 311         }
 312         if(dest_lookup) {
 313                 for(result = dest_lookup->result; result; result = result->next) {
 314                         if((result->type & IODNS_RECORD_A))
 315                                 dest_numip4++;
 316                         if((result->type & IODNS_RECORD_AAAA))
 317                                 dest_numip6++;
 318                 }
 319         }
 320         int useip6 = 0;
 321         int useip4 = 0;
 322         if(bind_lookup && (bind_numip6 == 0 && bind_numip4 == 0)) {
 323                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 324                 sprintf(errbuf, "could not lookup bind address (%s)", bind_lookup->hostname);
 325                 goto iosocket_lookup_apply_end;
 326         } else if(dest_lookup && (dest_numip6 == 0 && dest_numip4 == 0)) {
 327                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 328                 sprintf(errbuf, "could not lookup destination address (%s)", dest_lookup->hostname);
 329                 goto iosocket_lookup_apply_end;
 330         } else if(bind_lookup && dest_lookup) {
 331                 if(bind_numip6 > 0 && dest_numip6 > 0)
 332                         useip6 = 1;
 333                 if(bind_numip4 > 0 && dest_numip4 > 0)
 334                         useip4 = 1;
 335         } else if(bind_lookup) {
 336                 if(bind_numip6)
 337                         useip6 = 1;
 338                 if(bind_numip4)
 339                         useip4 = 1;
 340         } else if(dest_lookup) {
 341                 if(dest_numip6)
 342                         useip6 = 1;
 343                 if(dest_numip4)
 344                         useip4 = 1;
 345         }
 346
 347         int usetype = 0;
 348         if(useip6 && !noip6) {
 349                 usetype = IODNS_RECORD_AAAA;
 350                 iosock->socket_flags |= IOSOCKETFLAG_IPV6SOCKET;
 351                 if(useip4)
 352                         iosock->socket_flags |= IOSOCKETFLAG_RECONNECT_IPV4;
 353         } else if(useip4) {
 354                 usetype = IODNS_RECORD_A;
 355                 iosock->socket_flags &= ~(IOSOCKETFLAG_IPV6SOCKET | IOSOCKETFLAG_RECONNECT_IPV4);
 356         } else {
 357                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR;
 358                 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);
 359                 goto iosocket_lookup_apply_end;
 360         }
 361
 362         #define IOSOCKET_APPLY_COPYADDR(type) \
 363         iosock->type.addr.addresslen = result->result.addr.addresslen; \
 364         iosock->type.addr.address = malloc(result->result.addr.addresslen); \
 365         if(!iosock->type.addr.address) { \
 366                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__); \
 367                 iosock->type.addr.addresslen = 0; \
 368                 iosock->socket_flags |= IOSOCKETFLAG_DNSERROR; \
 369                 sprintf(errbuf, "could not allocate memory for dns information"); \
 370                 goto iosocket_lookup_apply_end; \
 371         } \
 372         memcpy(iosock->type.addr.address, result->result.addr.address, result->result.addr.addresslen);
 373
 374
 375         if(bind_lookup) {
 376                 int usenum = ((usetype == IODNS_RECORD_AAAA) ? bind_numip6 : bind_numip4);
 377                 usenum = rand() % usenum;
 378                 for(result = bind_lookup->result; result; result = result->next) {
 379                         if((result->type & usetype)) {
 380                                 if(usenum == 0) {
 381                                         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));
 382                                         iolog_trigger(IOLOG_DEBUG, "using IPv%s Address (%s) as bind address", ((usetype == IODNS_RECORD_AAAA) ? "6" : "4"), errbuf);
 383                                         IOSOCKET_APPLY_COPYADDR(bind)
 384                                         break;
 385                                 }
 386                                 usenum--;
 387                         }
 388                 }
 389         } else
 390                 iosock->bind.addr.addresslen = 0;
 391
 392         if(dest_lookup) {
 393                 int usenum = ((usetype == IODNS_RECORD_AAAA) ? dest_numip6 : dest_numip4);
 394                 usenum = rand() % usenum;
 395                 for(result = dest_lookup->result; result; result = result->next) {
 396                         if((result->type & usetype)) {
 397                                 if(usenum == 0) {
 398                                         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));
 399                                         iolog_trigger(IOLOG_DEBUG, "using IPv%s Address (%s) as dest address", ((usetype == IODNS_RECORD_AAAA) ? "6" : "4"), errbuf);
 400                                         IOSOCKET_APPLY_COPYADDR(dest)
 401                                         break;
 402                                 }
 403                                 usenum--;
 404                         }
 405                 }
 406         } else
 407                 iosock->dest.addr.addresslen = 0;
 408
 409         iosocket_lookup_apply_end:
 410
 411         if((iosock->socket_flags & IOSOCKETFLAG_DNSERROR)) {
 412                 // TODO: trigger error
 413                 iolog_trigger(IOLOG_ERROR, "error while trying to apply dns lookup information: %s", errbuf);
 414
 415                 if((iosock->socket_flags & IOSOCKETFLAG_PARENT_PUBLIC)) {
 416                         //trigger event
 417                         struct IOSocket *iosocket = iosock->parent;
 418
 419                         struct IOSocketEvent callback_event;
 420                         callback_event.type = IOSOCKETEVENT_DNSFAILED;
 421                         callback_event.socket = iosocket;
 422                         callback_event.data.recv_str = errbuf;
 423                         iosocket_trigger_event(&callback_event);
 424
 425                         iosocket_close(iosocket);
 426                 } else {
 427                         // TODO: IODNS Callback
 428                 }
 429                 return 0;
 430         } else
 431                 return 1;
 432 }
 433
 434 static void socket_lookup_clear(struct _IOSocket *iosock) {
 435         struct IOSocketDNSLookup *bind_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_BINDDNS) ? iosock->bind.addrlookup : NULL);
 436         struct IOSocketDNSLookup *dest_lookup = ((iosock->socket_flags & IOSOCKETFLAG_DNSDONE_DESTDNS) ? iosock->dest.addrlookup : NULL);
 437         if(bind_lookup) {
 438                 if(bind_lookup->result)
 439                         iodns_free_result(bind_lookup->result);
 440                 free(bind_lookup);
 441                 iosock->bind.addrlookup = NULL;
 442         }
 443         if(dest_lookup) {
 444                 if(dest_lookup->result)
 445                         iodns_free_result(dest_lookup->result);
 446                 free(dest_lookup);
 447                 iosock->dest.addrlookup = NULL;
 448         }
 449 }
 450
 451 static void iosocket_prepare_fd(int sockfd) {
 452         // prevent SIGPIPE
 453         #ifndef WIN32
 454         #if defined(SO_NOSIGPIPE)
 455         {
 456                 int set = 1;
 457                 setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&set, sizeof(int));
 458         }
 459         #else
 460         signal(SIGPIPE, SIG_IGN);
 461         #endif
 462         #endif
 463
 464         // make sockfd unblocking
 465         #if defined(F_GETFL)
 466         {
 467                 int fcntl_flags;
 468                 fcntl_flags = fcntl(sockfd, F_GETFL);
 469                 fcntl(sockfd, F_SETFL, fcntl_flags|O_NONBLOCK);
 470                 fcntl_flags = fcntl(sockfd, F_GETFD);
 471                 fcntl(sockfd, F_SETFD, fcntl_flags|FD_CLOEXEC);
 472         }
 473         #elif defined(FIONBIO)
 474         {
 475                 unsigned long ulong = 1;
 476                 ioctlsocket(sockfd, FIONBIO, &ulong);
 477         }
 478         #endif
 479 }
 480
 481 static void iosocket_connect_finish(struct _IOSocket *iosock) {
 482         int sockfd;
 483         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET))
 484                 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
 485         else
 486                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 487         if(sockfd == -1) {
 488                 iolog_trigger(IOLOG_ERROR, "could not create socket in %s:%d", __FILE__, __LINE__);
 489                 // TODO: trigger error
 490
 491                 return;
 492         }
 493
 494         // set port and bind address
 495         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET)) {
 496                 struct sockaddr_in6 *ip6 = (void*) iosock->dest.addr.address;
 497                 ip6->sin6_family = AF_INET6;
 498                 ip6->sin6_port = htons(iosock->port);
 499
 500                 if(iosock->bind.addr.addresslen) {
 501                         struct sockaddr_in6 *ip6bind = (void*) iosock->bind.addr.address;
 502                         ip6bind->sin6_family = AF_INET6;
 503                         ip6bind->sin6_port = htons(0);
 504
 505                         bind(sockfd, (struct sockaddr*)ip6bind, sizeof(*ip6bind));
 506                 }
 507         } else {
 508                 struct sockaddr_in *ip4 = (void*) iosock->dest.addr.address;
 509                 ip4->sin_family = AF_INET;
 510                 ip4->sin_port = htons(iosock->port);
 511
 512                 if(iosock->bind.addr.addresslen) {
 513                         struct sockaddr_in *ip4bind = (void*) iosock->bind.addr.address;
 514                         ip4bind->sin_family = AF_INET;
 515                         ip4bind->sin_port = htons(0);
 516
 517                         bind(sockfd, (struct sockaddr*)ip4bind, sizeof(*ip4bind));
 518                 }
 519         }
 520
 521         iosocket_prepare_fd(sockfd);
 522
 523         int ret = connect(sockfd, iosock->dest.addr.address, iosock->dest.addr.addresslen); //returns EINPROGRESS here (nonblocking)
 524         iolog_trigger(IOLOG_DEBUG, "connecting socket (connect: %d)", ret);
 525
 526         iosock->fd = sockfd;
 527         iosock->socket_flags |= IOSOCKETFLAG_CONNECTING;
 528
 529         iosocket_activate(iosock);
 530 }
 531
 532 static void iosocket_listen_finish(struct _IOSocket *iosock) {
 533         int sockfd;
 534         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET))
 535                 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
 536         else
 537                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 538         if(sockfd == -1) {
 539                 iolog_trigger(IOLOG_ERROR, "could not create socket in %s:%d", __FILE__, __LINE__);
 540                 // TODO: trigger error
 541
 542                 return;
 543         }
 544
 545         // set port and bind address
 546         if((iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET)) {
 547                 struct sockaddr_in6 *ip6bind = (void*) iosock->bind.addr.address;
 548                 ip6bind->sin6_family = AF_INET6;
 549                 ip6bind->sin6_port = htons(0);
 550
 551                 int opt = 1;
 552                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
 553
 554                 bind(sockfd, (struct sockaddr*)ip6bind, sizeof(*ip6bind));
 555         } else {
 556                 struct sockaddr_in *ip4bind = (void*) iosock->bind.addr.address;
 557                 ip4bind->sin_family = AF_INET;
 558                 ip4bind->sin_port = htons(0);
 559
 560                 int opt = 1;
 561                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
 562
 563                 bind(sockfd, (struct sockaddr*)ip4bind, sizeof(*ip4bind));
 564         }
 565
 566         iosocket_prepare_fd(sockfd);
 567
 568         listen(sockfd, 1);
 569         iosock->fd = sockfd;
 570
 571         iosocket_activate(iosock);
 572 }
 573
 574 struct _IOSocket *iosocket_accept_client(struct _IOSocket *iosock) {
 575         struct IOSocket *new_iosocket = calloc(1, sizeof(*new_iosocket));
 576         if(!new_iosocket) {
 577                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocket in %s:%d", __FILE__, __LINE__);
 578                 close(accept(iosock->fd, NULL, 0)); // simply drop connection
 579                 return NULL;
 580         }
 581         struct _IOSocket *new_iosock = _create_socket();
 582         if(!new_iosock) {
 583                 free(new_iosocket);
 584                 close(accept(iosock->fd, NULL, 0)); // simply drop connection
 585                 return NULL;
 586         }
 587         new_iosocket->iosocket = new_iosock;
 588         new_iosocket->status = IOSOCKET_CONNECTED;
 589         new_iosock->parent = new_iosocket;
 590         new_iosock->socket_flags |= IOSOCKETFLAG_PARENT_PUBLIC | IOSOCKETFLAG_INCOMING | (iosock->socket_flags & IOSOCKETFLAG_IPV6SOCKET);
 591
 592         struct sockaddr_storage addr;
 593         socklen_t addrlen = sizeof(addr);
 594
 595         //accept client
 596         new_iosock->fd = accept(iosock->fd, (struct sockaddr *)&addr, &addrlen);
 597
 598         //copy remote address
 599         new_iosock->dest.addr.address = malloc(addrlen);
 600         if(!new_iosock->dest.addr.address) {
 601                 close(new_iosock->fd);
 602                 free(new_iosock);
 603                 free(new_iosock);
 604                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 605                 return NULL;
 606         }
 607         memcpy(new_iosock->dest.addr.address, &addr, addrlen);
 608         new_iosock->dest.addr.addresslen = addrlen;
 609
 610         //copy local address
 611         new_iosock->bind.addr.address = malloc(iosock->bind.addr.addresslen);
 612         if(!new_iosock->bind.addr.address) {
 613                 close(new_iosock->fd);
 614                 free(new_iosock);
 615                 free(new_iosock);
 616                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for sockaddr in %s:%d", __FILE__, __LINE__);
 617                 return NULL;
 618         }
 619         memcpy(new_iosock->bind.addr.address, iosock->bind.addr.address, iosock->bind.addr.addresslen);
 620         new_iosock->bind.addr.addresslen = iosock->bind.addr.addresslen;
 621
 622         //prepare new socket fd
 623         iosocket_prepare_fd(new_iosock->fd);
 624
 625         if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {
 626                 new_iosocket->ssl = 1;
 627                 new_iosock->socket_flags |= IOSOCKETFLAG_SSLSOCKET;
 628                 \r
 629                 iossl_client_accepted(iosock, new_iosock);
 630         }
 631
 632         iosocket_activate(new_iosock);
 633         return new_iosock;
 634 }
 635
 636 /* public functions */
 637
 638 struct IOSocket *iosocket_connect(const char *hostname, unsigned int port, int ssl, const char *bindhost, iosocket_callback *callback) {
 639         return iosocket_connect_flags(hostname, port, ssl, bindhost, callback, (IOSOCKET_ADDR_IPV4 | IOSOCKET_ADDR_IPV6));
 640 }
 641
 642 struct IOSocket *iosocket_connect_flags(const char *hostname, unsigned int port, int ssl, const char *bindhost, iosocket_callback *callback, int flags) {
 643         struct IOSocket *iodescriptor = calloc(1, sizeof(*iodescriptor));
 644         if(!iodescriptor) {
 645                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocket in %s:%d", __FILE__, __LINE__);
 646                 return NULL;
 647         }
 648
 649         struct _IOSocket *iosock = _create_socket();
 650         if(!iosock) {
 651                 free(iodescriptor);
 652                 return NULL;
 653         }
 654
 655         iodescriptor->iosocket = iosock;
 656         iodescriptor->status = IOSOCKET_CONNECTING;
 657         iodescriptor->callback = callback;
 658         iosock->parent = iodescriptor;
 659         iosock->socket_flags |= IOSOCKETFLAG_PARENT_PUBLIC;
 660         iosock->port = port;
 661         if(ssl) {
 662                 iodescriptor->ssl = 1;
 663                 iosock->socket_flags |= IOSOCKETFLAG_SSLSOCKET;
 664         }
 665
 666         if(bindhost) {
 667                 switch(iosocket_parse_address(bindhost, &iosock->bind.addr, flags)) {
 668                 case -1:
 669                         free(iosock);
 670                         return NULL;
 671                 case 0:
 672                         /* start dns lookup */
 673                         iosock->socket_flags |= IOSOCKETFLAG_PENDING_BINDDNS;
 674                         iosocket_lookup_hostname(iosock, bindhost, flags, 1);
 675                         break;
 676                 case 1:
 677                         /* valid address */
 678                         break;
 679                 }
 680         }
 681         switch(iosocket_parse_address(hostname, &iosock->dest.addr, flags)) {
 682         case -1:
 683                 free(iosock);
 684                 return NULL;
 685         case 0:
 686                 /* start dns lookup */
 687                 iosock->socket_flags |= IOSOCKETFLAG_PENDING_DESTDNS;
 688                 iosocket_lookup_hostname(iosock, hostname, flags, 0);
 689                 break;
 690         case 1:
 691                 /* valid address */
 692                 break;
 693         }
 694         if((iosock->socket_flags & (IOSOCKETFLAG_PENDING_BINDDNS | IOSOCKETFLAG_PENDING_DESTDNS)) == 0) {
 695                 iosocket_connect_finish(iosock);
 696         }
 697         return iodescriptor;
 698 }
 699
 700 struct IOSocket *iosocket_listen(const char *hostname, unsigned int port, iosocket_callback *callback) {
 701         return iosocket_listen_flags(hostname, port, callback, (IOSOCKET_ADDR_IPV4 | IOSOCKET_ADDR_IPV6));
 702 }
 703
 704 struct IOSocket *iosocket_listen_flags(const char *hostname, unsigned int port, iosocket_callback *callback, int flags) {
 705         struct IOSocket *iodescriptor = calloc(1, sizeof(*iodescriptor));
 706         if(!iodescriptor) {
 707                 iolog_trigger(IOLOG_ERROR, "could not allocate memory for IOSocket in %s:%d", __FILE__, __LINE__);
 708                 return NULL;
 709         }
 710
 711         struct _IOSocket *iosock = _create_socket();
 712         if(!iosock) {
 713                 free(iodescriptor);
 714                 return NULL;
 715         }
 716
 717         iodescriptor->iosocket = iosock;
 718         iodescriptor->status = IOSOCKET_LISTENING;
 719         iodescriptor->listening = 1;
 720         iodescriptor->callback = callback;
 721         iosock->parent = iodescriptor;
 722         iosock->socket_flags |= IOSOCKETFLAG_PARENT_PUBLIC | IOSOCKETFLAG_LISTENING;
 723         iosock->port = port;
 724
 725         switch(iosocket_parse_address(hostname, &iosock->bind.addr, flags)) {
 726         case -1:
 727                 free(iosock);
 728                 return NULL;
 729         case 0:
 730                 /* start dns lookup */
 731                 iosock->socket_flags |= IOSOCKETFLAG_PENDING_BINDDNS;
 732                 iosocket_lookup_hostname(iosock, hostname, flags, 1);
 733                 break;
 734         case 1:
 735                 /* valid address */
 736                 break;
 737         }
 738         if((iosock->socket_flags & IOSOCKETFLAG_PENDING_BINDDNS) == 0) {
 739                 iosocket_listen_finish(iosock);
 740         }
 741         return iodescriptor;
 742 }
 743
 744 struct IOSocket *iosocket_listen_ssl(const char *hostname, unsigned int port, const char *certfile, const char *keyfile, iosocket_callback *callback) {
 745         return iosocket_listen_ssl_flags(hostname, port, certfile, keyfile, callback, (IOSOCKET_ADDR_IPV4 | IOSOCKET_ADDR_IPV6));
 746 }
 747
 748 struct IOSocket *iosocket_listen_ssl_flags(const char *hostname, unsigned int port, const char *certfile, const char *keyfile, iosocket_callback *callback, int flags) {
 749         struct IOSocket *iosocket = iosocket_listen_flags(hostname, port, callback, flags);\r
 750         struct _IOSocket *iosock = iosocket->iosocket;\r
 751         iosock->socket_flags |= IOSOCKETFLAG_SSLSOCKET | IOSOCKETFLAG_SSL_HANDSHAKE;\r
 752         iossl_listen(iosock, certfile, keyfile);
 753         return iosocket;
 754 }
 755
 756 void iosocket_close(struct IOSocket *iosocket) {
 757         struct _IOSocket *iosock = iosocket->iosocket;
 758         if(iosock == NULL) {
 759                 iolog_trigger(IOLOG_WARNING, "called iosocket_close for destroyed IOSocket in %s:%d", __FILE__, __LINE__);
 760                 return;
 761         }
 762
 763         iosock->socket_flags |= IOSOCKETFLAG_SHUTDOWN;
 764
 765         if(iosock->writebuf.bufpos) {
 766                 //try to send everything before closing
 767 #if defined(F_GETFL)
 768                 {
 769                         int flags;
 770                         flags = fcntl(iosock->fd, F_GETFL);
 771                         fcntl(iosock->fd, F_SETFL, flags & ~O_NONBLOCK);
 772                         flags = fcntl(iosock->fd, F_GETFD);
 773                         fcntl(iosock->fd, F_SETFD, flags|FD_CLOEXEC);
 774                 }
 775 #else
 776                 iosocket_deactivate(iosock);
 777 #endif
 778                 iosocket_try_write(iosock);
 779         }
 780         //close IOSocket
 781         if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET))
 782                 iossl_disconnect(iosock);
 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 && !(iosock->socket_flags & IOSOCKETFLAG_SSL_WRITEHS)) \r
 793                 return 0;
 794         iolog_trigger(IOLOG_DEBUG, "write writebuf (%d bytes) to socket (fd: %d)", iosock->writebuf.bufpos, iosock->fd);
 795         int res;
 796         if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET))
 797                 res = iossl_write(iosock, iosock->writebuf.buffer, iosock->writebuf.bufpos);
 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 - 1, text, arg_list);
 850         va_end(arg_list);
 851         if (pos < 0 || pos > (IOSOCKET_PRINTF_LINE_LEN - 1)) pos = IOSOCKET_PRINTF_LINE_LEN - 1;
 852         sendBuf[pos] = '\0';
 853         iosocket_send(iosocket, sendBuf, pos);
 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                         if(readable || writeable) {
 874                                 if((iosock->socket_flags & IOSOCKETFLAG_INCOMING))
 875                                         iossl_server_handshake(iosock);
 876                                 else
 877                                         iossl_client_handshake(iosock);
 878                                 engine->update(iosock);\r
 879                         } else if((iosock->socket_flags & IOSOCKETFLAG_LISTENING)) {\r
 880                                 //TODO: SSL init error\r
 881                         } else if((iosock->socket_flags & IOSOCKETFLAG_INCOMING)) {\r
 882                                 if((iosock->socket_flags & IOSOCKETFLAG_SSL_ESTABLISHED)) {\r
 883                                         //incoming SSL connection accepted\r
 884                                         iosock->socket_flags &= ~IOSOCKETFLAG_SSL_HANDSHAKE;\r
 885                                         callback_event.type = IOSOCKETEVENT_ACCEPT;\r
 886                                         callback_event.data.accept_socket = iosock->parent;\r
 887                                 } else {\r
 888                                         //incoming SSL connection failed, simply drop\r
 889                                         iosock->socket_flags |= IOSOCKETFLAG_DEAD;\r
 890                                         iolog_trigger(IOLOG_ERROR, "SSL Handshake failed for incoming connection. Dropping fd %d", iosock->fd);\r
 891                                 }
 892                         } else {
 893                                 // SSL Backend finished
 894                                 if((iosock->socket_flags & IOSOCKETFLAG_SSL_ESTABLISHED)) {\r
 895                                         iosocket->status = IOSOCKET_CONNECTED;\r
 896                                         iosock->socket_flags &= ~IOSOCKETFLAG_SSL_HANDSHAKE;\r
 897                                         callback_event.type = IOSOCKETEVENT_CONNECTED;\r
 898                                         engine->update(iosock);\r
 899                                         \r
 900                                         //initialize readbuf\r
 901                                         iosocket_increase_buffer(&iosock->readbuf, 1024);
 902                                 } else {
 903                                         callback_event.type = IOSOCKETEVENT_NOTCONNECTED;\r
 904                                         iosock->socket_flags |= IOSOCKETFLAG_DEAD;
 905                                 }
 906                         }
 907                 } else if((iosock->socket_flags & IOSOCKETFLAG_LISTENING)) {
 908                         if(readable) {
 909                                 //new client connected
 910                                 struct _IOSocket *new_iosock = iosocket_accept_client(iosock);
 911                                 if(!new_iosock)
 912                                         return;
 913
 914                                 if(!(new_iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {
 915                                         callback_event.type = IOSOCKETEVENT_ACCEPT;
 916                                         callback_event.data.accept_socket = new_iosock->parent;
 917                                 }
 918                         }
 919
 920                 } else if((iosock->socket_flags & IOSOCKETFLAG_CONNECTING)) {
 921                         if(readable) { //could not connect
 922                                 if((iosock->socket_flags & (IOSOCKETFLAG_IPV6SOCKET | IOSOCKETFLAG_RECONNECT_IPV4)) == (IOSOCKETFLAG_IPV6SOCKET | IOSOCKETFLAG_RECONNECT_IPV4)) {
 923                                         iolog_trigger(IOLOG_DEBUG, "connecting to IPv6 host (%s) failed. trying to connect using IPv4.", iosock->dest.addrlookup->hostname);
 924                                         iosocket_deactivate(iosock);
 925                                         if(iosocket_lookup_apply(iosock, 1)) { //if ret=0 an error occured in iosocket_lookup_apply and we should stop here.
 926                                                 iosocket_connect_finish(iosock);
 927                                                 socket_lookup_clear(iosock);
 928                                         }
 929                                 } else {
 930                                         callback_event.type = IOSOCKETEVENT_NOTCONNECTED;
 931                                         /*
 932                                         socklen_t arglen = sizeof(callback_event.data.errid);
 933                                         if (getsockopt(iosock->fd, SOL_SOCKET, SO_ERROR, &callback_event.data.errid, &arglen) < 0)
 934                                                 callback_event.data.errid = errno;
 935                                         */
 936                                         iosock->socket_flags |= IOSOCKETFLAG_DEAD;
 937                                 }
 938                         } else if(writeable) { //connection established
 939                                 iosock->socket_flags &= ~IOSOCKETFLAG_CONNECTING;
 940                                 socket_lookup_clear(iosock);
 941                                 if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {\r
 942                                         iolog_trigger(IOLOG_DEBUG, "SSL client socket connected. Stating SSL handshake...");
 943                                         iossl_connect(iosock);
 944                                         engine->update(iosock);
 945                                         return;
 946                                 }
 947                                 iosocket->status = IOSOCKET_CONNECTED;
 948
 949                                 callback_event.type = IOSOCKETEVENT_CONNECTED;
 950                                 engine->update(iosock);
 951
 952                                 //initialize readbuf
 953                                 iosocket_increase_buffer(&iosock->readbuf, 1024);
 954                         }
 955                 } else {\r
 956                         int ssl_rehandshake = 0;\r
 957                         if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET)) {\r
 958                                 if((iosock->socket_flags & IOSOCKETFLAG_SSL_READHS))\r
 959                                         ssl_rehandshake = 1;\r
 960                                 else if((iosock->socket_flags & IOSOCKETFLAG_SSL_WRITEHS))\r
 961                                         ssl_rehandshake = 2;\r
 962                         }
 963                         if((readable && ssl_rehandshake == 0) || ssl_rehandshake == 1) {
 964                                 int bytes;
 965                                 if(iosock->readbuf.buflen - iosock->readbuf.bufpos >= 128)
 966                                         iosocket_increase_buffer(&iosock->readbuf, iosock->readbuf.buflen + 1024);
 967                                 if((iosock->socket_flags & IOSOCKETFLAG_SSLSOCKET))
 968                                         bytes = iossl_read(iosock, iosock->readbuf.buffer + iosock->readbuf.bufpos, iosock->readbuf.buflen - iosock->readbuf.bufpos);
 969                                 else
 970                                         bytes = recv(iosock->fd, iosock->readbuf.buffer + iosock->readbuf.bufpos, iosock->readbuf.buflen - iosock->readbuf.bufpos, 0);
 971
 972                                 if(bytes <= 0) {\r
 973                                         if((iosock->socket_flags & (IOSOCKETFLAG_SSLSOCKET | IOSOCKETFLAG_SSL_READHS)) == (IOSOCKETFLAG_SSLSOCKET | IOSOCKETFLAG_SSL_READHS)) {\r
 974                                                 ssl_rehandshake = 1;\r
 975                                         } else if (errno != EAGAIN || errno != EWOULDBLOCK) {
 976                                                 iosock->socket_flags |= IOSOCKETFLAG_DEAD;
 977
 978                                                 callback_event.type = IOSOCKETEVENT_CLOSED;
 979                                                 callback_event.data.errid = errno;
 980                                         }
 981                                 } else {
 982                                         int i;
 983                                         iolog_trigger(IOLOG_DEBUG, "received %d bytes (fd: %d). readbuf position: %d", bytes, iosock->fd, iosock->readbuf.bufpos);
 984                                         iosock->readbuf.bufpos += bytes;
 985                                         callback_event.type = IOSOCKETEVENT_RECV;
 986
 987                                         if(iosocket->parse_delimiter) {
 988                                                 int j, used_bytes = 0;
 989                                                 for(i = 0; i < iosock->readbuf.bufpos; i++) {
 990                                                         int is_delimiter = 0;
 991                                                         for(j = 0; j < IOSOCKET_PARSE_DELIMITERS_COUNT; j++) {
 992                                                                 if(iosock->readbuf.buffer[i] == iosocket->delimiters[j]) {
 993                                                                         is_delimiter = 1;
 994                                                                         break;
 995                                                                 }
 996                                                         }
 997                                                         if(is_delimiter) {
 998                                                                 iosock->readbuf.buffer[i] = 0;
 999                                                                 callback_event.data.recv_str = iosock->readbuf.buffer + used_bytes;
1000                                                                 iolog_trigger(IOLOG_DEBUG, "parsed line (%d bytes): %s", i - used_bytes, iosock->readbuf.buffer + used_bytes);
1001                                                                 used_bytes = i+1;
1002                                                                 if(iosock->readbuf.buffer[i-1] != 0 || iosocket->parse_empty)
1003                                                                         iosocket_trigger_event(&callback_event);
1004                                                         }
1005                                                         #ifdef IOSOCKET_PARSE_LINE_LIMIT
1006                                                         else if(i + 1 - used_bytes >= IOSOCKET_PARSE_LINE_LIMIT) {
1007                                                                 iosock->readbuf.buffer[i] = 0;
1008                                                                 callback_event.data.recv_str = iosock->readbuf.buffer + used_bytes;
1009                                                                 iolog_trigger(IOLOG_DEBUG, "parsed and stripped line (%d bytes): %s", i - used_bytes, iosock->readbuf.buffer + used_bytes);
1010                                                                 for(; i < iosock->readbuf.bufpos; i++) { //skip the rest of the line
1011                                                                         is_delimiter = 0;
1012                                                                         if(iosock->readbuf.buffer[i] == iosocket->delimiters[j])
1013                                                                                 break;
1014                                                                 }
1015                                                                 used_bytes = i+1;
1016                                                                 iosocket_trigger_event(&callback_event);
1017                                                         }
1018                                                         #endif
1019                                                 }
1020                                                 if(used_bytes) {
1021                                                         if(used_bytes == iosock->readbuf.bufpos) {
1022                                                                 iosock->readbuf.bufpos = 0;
1023                                                                 iolog_trigger(IOLOG_DEBUG, "readbuf fully processed (set buffer position to 0)");
1024                                                         } else {
1025                                                                 iolog_trigger(IOLOG_DEBUG, "readbuf rest: %d bytes (used %d bytes)", iosock->readbuf.bufpos - used_bytes, used_bytes);
1026                                                                 memmove(iosock->readbuf.buffer, iosock->readbuf.buffer + used_bytes, iosock->readbuf.bufpos - used_bytes);
1027                                                                 iosock->readbuf.bufpos -= used_bytes;
1028                                                         }
1029                                                 }
1030                                                 callback_event.type = IOSOCKETEVENT_IGNORE;
1031                                         } else
1032                                                 callback_event.data.recv_buf = &iosock->readbuf;
1033                                 }
1034                         }
1035                         if((writeable && ssl_rehandshake == 0) || ssl_rehandshake == 2) {
1036                                 int bytes;
1037                                 bytes = iosocket_try_write(iosock);
1038                                 if(bytes < 0) {\r
1039                                         if((iosock->socket_flags & (IOSOCKETFLAG_SSLSOCKET | IOSOCKETFLAG_SSL_WRITEHS)) == (IOSOCKETFLAG_SSLSOCKET | IOSOCKETFLAG_SSL_WRITEHS)) {\r
1040                                                 ssl_rehandshake = 1;\r
1041                                         } else {
1042                                                 iosock->socket_flags |= IOSOCKETFLAG_DEAD;
1043
1044                                                 callback_event.type = IOSOCKETEVENT_CLOSED;
1045                                                 callback_event.data.errid = errno;\r
1046                                         }
1047                                 }
1048                         }\r
1049                         if(ssl_rehandshake) {
1050                                 engine->update(iosock);\r
1051                         }
1052                 }
1053                 if(callback_event.type != IOSOCKETEVENT_IGNORE)
1054                         iosocket_trigger_event(&callback_event);
1055                 if((iosock->socket_flags & IOSOCKETFLAG_DEAD))
1056                         iosocket_close(iosocket);
1057
1058         } else if((iosock->socket_flags & IOSOCKETFLAG_PARENT_DNSENGINE)) {
1059                 //TODO: IODNS callback
1060         }
1061 }
1062
1063 void iosocket_loop(int usec) {
1064         struct timeval timeout;
1065         timeout.tv_sec = usec / 1000000;
1066         timeout.tv_usec = usec % 1000000;
1067         engine->loop(&timeout);
1068 }