WINGs/connection.c

   1 /*
   2  *  WINGs WMConnection function library
   3  *
   4  *  Copyright (c) 1999-2000 Dan Pascu
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21
  22 /*
  23  * TODO:
  24  * - decide if we want to support connections with external sockets, else
  25  *   clean up the structure of the unneeded members.
  26  * - decide what to do with all wsyserror() and wwarning() calls that are
  27  *   still there.
  28  *
  29  */
  30
  31
  32 #include "../src/config.h"
  33
  34 #include <unistd.h>
  35 #include <fcntl.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <stdarg.h>
  40 #include <errno.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <arpa/inet.h>
  44 #include <netdb.h>
  45 #include <signal.h>
  46 #ifdef __FreeBSD__
  47 #include <sys/signal.h>
  48 #endif
  49
  50 #include "WINGs.h"
  51
  52
  53 /* Some older systems does not define this (linux libc5, maybe others too) */
  54 #ifndef SHUT_RDWR
  55 # define SHUT_RDWR              2
  56 #endif
  57
  58 /* For SunOS */
  59 #ifndef SA_RESTART
  60 # define SA_RESTART             0
  61 #endif
  62
  63 /* For Solaris */
  64 #ifndef INADDR_NONE
  65 # define INADDR_NONE           -1
  66 #endif
  67
  68 /* Stuff for setting the sockets into non-blocking mode. */
  69 /*#ifdef        __POSIX_SOURCE
  70 # define NONBLOCK_OPT           O_NONBLOCK
  71 #else
  72 # define NONBLOCK_OPT           FNDELAY
  73 #endif*/
  74
  75 #define NONBLOCK_OPT            O_NONBLOCK
  76
  77 #define NETBUF_SIZE             4096
  78
  79 #define DEF_TIMEOUT             600   /* 600 seconds == 10 minutes */
  80
  81
  82
  83 int WCErrorCode = 0;
  84
  85 static Bool SigInitialized = False;
  86
  87 static unsigned int DefaultTimeout = DEF_TIMEOUT;
  88 static unsigned int OpenTimeout = DEF_TIMEOUT;
  89
  90
  91
  92 typedef struct TimeoutData {
  93     unsigned timeout;
  94     WMHandlerID *handler;
  95 } TimeoutData;
  96
  97
  98 typedef struct W_Connection {
  99     int sock;                     /* the socket we speak through */
 100
 101     struct {
 102         WMHandlerID *read;        /* the input read handler */
 103         WMHandlerID *write;       /* the input write handler */
 104         WMHandlerID *exception;   /* the input exception handler */
 105     } handler;
 106
 107     ConnectionDelegate *delegate; /* client delegates */
 108     void *clientData;             /* client data */
 109     unsigned int uflags;          /* flags for the client */
 110
 111     WMArray *outputQueue;
 112     unsigned bufPos;
 113
 114     TimeoutData sendTimeout;
 115     TimeoutData openTimeout;
 116
 117     WMConnectionState state;
 118     WMConnectionTimeoutState timeoutState;
 119
 120     char *address;
 121     char *service;
 122     char *protocol;
 123
 124     Bool closeOnRelease;
 125     Bool wasNonBlocking;
 126     Bool isNonBlocking;
 127
 128 } W_Connection;
 129
 130
 131
 132 static void
 133 clearOutputQueue(WMConnection *cPtr) /*FOLD00*/
 134 {
 135     cPtr->bufPos = 0;
 136     WMEmptyArray(cPtr->outputQueue);
 137 }
 138
 139
 140 static void
 141 openTimeout(void *cdata) /*FOLD00*/
 142 {
 143     WMConnection *cPtr = (WMConnection*) cdata;
 144
 145     cPtr->openTimeout.handler = NULL;
 146     if (cPtr->handler.write) {
 147         WMDeleteInputHandler(cPtr->handler.write);
 148         cPtr->handler.write = NULL;
 149     }
 150     if (cPtr->state != WCConnected) {
 151         cPtr->state = WCTimedOut;
 152         cPtr->timeoutState = WCTWhileOpening;
 153         if (cPtr->delegate && cPtr->delegate->didTimeout) {
 154             (*cPtr->delegate->didTimeout)(cPtr->delegate, cPtr);
 155         } else {
 156             WMCloseConnection(cPtr);
 157             cPtr->state = WCTimedOut; /* the above set state to WCClosed */
 158         }
 159     }
 160 }
 161
 162
 163 static void
 164 sendTimeout(void *cdata) /*FOLD00*/
 165 {
 166     WMConnection *cPtr = (WMConnection*) cdata;
 167
 168     cPtr->sendTimeout.handler = NULL;
 169     if (cPtr->handler.write) {
 170         WMDeleteInputHandler(cPtr->handler.write);
 171         cPtr->handler.write = NULL;
 172     }
 173     if (WMGetArrayItemCount(cPtr->outputQueue)>0) {
 174         clearOutputQueue(cPtr);
 175         cPtr->state = WCTimedOut;
 176         cPtr->timeoutState = WCTWhileSending;
 177         if (cPtr->delegate && cPtr->delegate->didTimeout) {
 178             (*cPtr->delegate->didTimeout)(cPtr->delegate, cPtr);
 179         } else {
 180             WMCloseConnection(cPtr);
 181             cPtr->state = WCTimedOut; /* the above set state to WCClosed */
 182         }
 183     }
 184 }
 185
 186
 187 static void
 188 inputHandler(int fd, int mask, void *clientData) /*FOLD00*/
 189 {
 190     WMConnection *cPtr = (WMConnection*)clientData;
 191
 192     if (cPtr->state==WCClosed || cPtr->state==WCDied)
 193         return;
 194
 195     if ((mask & WIWriteMask)) {
 196         if (cPtr->state == WCInProgress) {
 197             Bool failed;
 198             int result;
 199             int len = sizeof(result);
 200
 201             WCErrorCode = 0;
 202             if (getsockopt(cPtr->sock, SOL_SOCKET, SO_ERROR,
 203                            (void*)&result, &len) == 0 && result != 0) {
 204                 cPtr->state = WCFailed;
 205                 WCErrorCode = result;
 206                 failed = True;
 207                 /* should call wsyserrorwithcode(result, ...) here? */
 208             } else {
 209                 cPtr->state = WCConnected;
 210                 failed = False;
 211             }
 212
 213             if (cPtr->handler.write) {
 214                 WMDeleteInputHandler(cPtr->handler.write);
 215                 cPtr->handler.write = NULL;
 216             }
 217
 218             if (cPtr->openTimeout.handler) {
 219                 WMDeleteTimerHandler(cPtr->openTimeout.handler);
 220                 cPtr->openTimeout.handler = NULL;
 221             }
 222
 223             if (cPtr->delegate && cPtr->delegate->didInitialize)
 224                 (*cPtr->delegate->didInitialize)(cPtr->delegate, cPtr);
 225
 226             /* we use failed and not cPtr->state here, because cPtr may be
 227              * destroyed by the delegate called above if the connection failed
 228              */
 229             if (failed)
 230                 return;
 231         } else if (cPtr->state == WCConnected) {
 232             WMFlushConnection(cPtr);
 233         }
 234     }
 235
 236     if (!cPtr->delegate)
 237         return;
 238
 239     /* if the connection died, may get destroyed in the delegate, so retain */
 240     wretain(cPtr);
 241
 242     if ((mask & WIReadMask) && cPtr->delegate->didReceiveInput)
 243         (*cPtr->delegate->didReceiveInput)(cPtr->delegate, cPtr);
 244
 245     if ((mask & WIExceptMask) && cPtr->delegate->didCatchException)
 246         (*cPtr->delegate->didCatchException)(cPtr->delegate, cPtr);
 247
 248     wrelease(cPtr);
 249 }
 250
 251
 252 static Bool
 253 setSocketNonBlocking(int sock, Bool flag) /*FOLD00*/
 254 {
 255     int state;
 256     Bool isNonBlock;
 257
 258     state = fcntl(sock, F_GETFL, 0);
 259
 260     if (state < 0) {
 261         /* set WCErrorCode here? -Dan*/
 262         return False;
 263     }
 264
 265     isNonBlock = (state & NONBLOCK_OPT) != 0;
 266
 267     if (flag) {
 268         if (isNonBlock)
 269             return True;
 270         state |= NONBLOCK_OPT;
 271     } else {
 272         if (!isNonBlock)
 273             return True;
 274         state &= ~NONBLOCK_OPT;
 275     }
 276
 277     if (fcntl(sock, F_SETFL, state) < 0) {
 278         /* set WCErrorCode here? -Dan*/
 279         return False;
 280     }
 281
 282     return True;
 283 }
 284
 285
 286 static void
 287 setConnectionAddress(WMConnection *cPtr, struct sockaddr_in *socketaddr) /*FOLD00*/
 288 {
 289     wassertr(cPtr->address==NULL);
 290
 291     cPtr->address = wstrdup(inet_ntoa(socketaddr->sin_addr));
 292     cPtr->service = wmalloc(16);
 293     sprintf(cPtr->service, "%hu", ntohs(socketaddr->sin_port));
 294     cPtr->protocol = wstrdup("tcp");
 295 }
 296
 297
 298 static struct sockaddr_in*
 299 getSocketAddress(char* name, char* service, char* protocol) /*FOLD00*/
 300 {
 301     static struct sockaddr_in socketaddr;
 302     struct servent *sp;
 303
 304     if (!protocol || protocol[0]==0)
 305         protocol = "tcp";
 306
 307     memset(&socketaddr, 0, sizeof(struct sockaddr_in));
 308     socketaddr.sin_family = AF_INET;
 309
 310     /*
 311      * If we were given a hostname, we use any address for that host.
 312      * Otherwise we expect the given name to be an address unless it is
 313      * NULL (any address).
 314      */
 315     if (name && name[0]!=0) {
 316         WMHost *host = WMGetHostWithName(name);
 317
 318         if (!host)
 319             return NULL; /* name is not a hostname nor a number and dot adr */
 320
 321         name = WMGetHostAddress(host);
 322 #ifndef HAVE_INET_ATON
 323         if ((socketaddr.sin_addr.s_addr = inet_addr(name)) == INADDR_NONE) {
 324 #else
 325         if (inet_aton(name, &socketaddr.sin_addr) == 0) {
 326 #endif
 327             WMReleaseHost(host);
 328             return NULL;
 329         }
 330         WMReleaseHost(host);
 331     } else {
 332         socketaddr.sin_addr.s_addr = htonl(INADDR_ANY);
 333     }
 334
 335     if (!service || service[0]==0) {
 336         socketaddr.sin_port = 0;
 337     } else if ((sp = getservbyname(service, protocol))==0) {
 338         char *endptr;
 339         unsigned portNumber;
 340
 341         portNumber = strtoul(service, &endptr, 10);
 342
 343         if (service[0]!=0 && *endptr==0 && portNumber<65536) {
 344             socketaddr.sin_port = htons(portNumber);
 345         } else {
 346             return NULL;
 347         }
 348     } else {
 349         socketaddr.sin_port = sp->s_port;
 350     }
 351
 352     return &socketaddr;
 353 }
 354
 355
 356 static WMConnection*
 357 createConnectionWithSocket(int sock, Bool closeOnRelease) /*FOLD00*/
 358 {
 359     WMConnection *cPtr;
 360     struct sigaction sig_action;
 361
 362     cPtr = wmalloc(sizeof(WMConnection));
 363     wretain(cPtr);
 364     memset(cPtr, 0, sizeof(WMConnection));
 365
 366     fcntl(sock, F_SETFD, FD_CLOEXEC); /* by default close on exec */
 367
 368     cPtr->sock = sock;
 369     cPtr->openTimeout.timeout = OpenTimeout;
 370     cPtr->openTimeout.handler = NULL;
 371     cPtr->sendTimeout.timeout = DefaultTimeout;
 372     cPtr->sendTimeout.handler = NULL;
 373     cPtr->closeOnRelease = closeOnRelease;
 374     cPtr->outputQueue =
 375         WMCreateArrayWithDestructor(16, (WMFreeDataProc*)WMReleaseData);
 376     cPtr->state = WCNotConnected;
 377     cPtr->timeoutState = WCTNone;
 378
 379     /* ignore dead pipe */
 380     if (!SigInitialized) {
 381         sig_action.sa_handler = SIG_IGN;
 382         sig_action.sa_flags = SA_RESTART;
 383         sigaction(SIGPIPE, &sig_action, NULL);
 384         SigInitialized = True;
 385     }
 386
 387     return cPtr;
 388 }
 389
 390
 391 #if 0
 392 WMConnection*
 393 WMCreateConnectionWithSocket(int sock, Bool closeOnRelease) /*FOLD00*/
 394 {
 395     WMConnection *cPtr;
 396     struct sockaddr_in clientname;
 397     int size, n;
 398
 399     cPtr = createConnectionWithSocket(sock, closeOnRelease);
 400     cPtr->wasNonBlocking = WMIsConnectionNonBlocking(cPtr);
 401     cPtr->isNonBlocking = cPtr->wasNonBlocking;
 402
 403     /* some way to find out if it is connected, and binded. can't find
 404        if it listens though!!!
 405     */
 406
 407     size = sizeof(clientname);
 408     n = getpeername(sock, (struct sockaddr*) &clientname, &size);
 409     if (n==0) {
 410         /* Since we have a peer, it means we are connected */
 411         cPtr->state = WCConnected;
 412     } else {
 413         size = sizeof(clientname);
 414         n = getsockname(sock, (struct sockaddr*) &clientname, &size);
 415         if (n==0) {
 416             /* We don't have a peer, but we are binded to an address.
 417              * Assume we are listening on it (we don't know that for sure!)
 418              */
 419             cPtr->state = WCListening;
 420         } else {
 421             cPtr->state = WCNotConnected;
 422         }
 423     }
 424
 425     return cPtr;
 426 }
 427 #endif
 428
 429
 430 /*
 431  * host     is the name on which we want to listen for incoming connections,
 432  *          and it must be a name of this host, or NULL if we want to listen
 433  *          on any incoming address.
 434  * service  is either a service name as present in /etc/services, or the port
 435  *          number we want to listen on. If NULL, a random port between
 436  *          1024 and 65535 will be assigned to us.
 437  * protocol is one of "tcp" or "udp". If NULL, "tcp" will be used by default.
 438  *          currently only "tcp" is supported.
 439  */
 440 WMConnection*
 441 WMCreateConnectionAsServerAtAddress(char *host, char *service, char *protocol) /*FOLD00*/
 442 {
 443     WMConnection *cPtr;
 444     struct sockaddr_in *socketaddr;
 445     int sock, size, on;
 446
 447     WCErrorCode = 0;
 448
 449     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 450         wwarning("Bad address-service-protocol combination");
 451         return NULL;
 452     }
 453
 454     /* Create the actual socket */
 455     sock = socket(PF_INET, SOCK_STREAM, 0);
 456     if (sock<0) {
 457         WCErrorCode = errno;
 458         return NULL;
 459     }
 460
 461     /*
 462      * Set socket options. We try to make the port reusable and have it
 463      * close as fast as possible without waiting in unnecessary wait states
 464      * on close.
 465      */
 466     on = 1;
 467     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
 468
 469     if (bind(sock, (struct sockaddr *)socketaddr, sizeof(*socketaddr)) < 0) {
 470         WCErrorCode = errno;
 471         close(sock);
 472         return NULL;
 473     }
 474
 475     if (listen(sock, 10) < 0) {
 476         WCErrorCode = errno;
 477         close(sock);
 478         return NULL;
 479     }
 480
 481     /* Find out what is the address/service/protocol we get */
 482     /* In case some of address/service/protocol were NULL */
 483     size = sizeof(*socketaddr);
 484     if (getsockname(sock, (struct sockaddr*)socketaddr, &size) < 0) {
 485         WCErrorCode = errno;
 486         close(sock);
 487         return NULL;
 488     }
 489
 490     cPtr = createConnectionWithSocket(sock, True);
 491     cPtr->state = WCListening;
 492     WMSetConnectionNonBlocking(cPtr, True);
 493
 494     setConnectionAddress(cPtr, socketaddr);
 495
 496     return cPtr;
 497 }
 498
 499
 500 WMConnection*
 501 WMCreateConnectionToAddress(char *host, char *service, char *protocol) /*FOLD00*/
 502 {
 503     WMConnection *cPtr;
 504     struct sockaddr_in *socketaddr;
 505     int sock;
 506
 507     WCErrorCode = 0;
 508
 509     wassertrv(service!=NULL && service[0]!=0, NULL);
 510
 511     if (host==NULL || host[0]==0)
 512         host = "localhost";
 513
 514     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 515         wwarning("Bad address-service-protocol combination");
 516         return NULL;
 517     }
 518
 519     /* Create the actual socket */
 520     sock = socket(PF_INET, SOCK_STREAM, 0);
 521     if (sock<0) {
 522         WCErrorCode = errno;
 523         return NULL;
 524     }
 525     /* make socket blocking while we connect. */
 526     setSocketNonBlocking(sock, False);
 527     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 528         WCErrorCode = errno;
 529         close(sock);
 530         return NULL;
 531     }
 532
 533     cPtr = createConnectionWithSocket(sock, True);
 534     cPtr->state = WCConnected;
 535     WMSetConnectionNonBlocking(cPtr, True);
 536     setConnectionAddress(cPtr, socketaddr);
 537
 538     return cPtr;
 539 }
 540
 541
 542 WMConnection*
 543 WMCreateConnectionToAddressAndNotify(char *host, char *service, char *protocol) /*FOLD00*/
 544 {
 545     WMConnection *cPtr;
 546     struct sockaddr_in *socketaddr;
 547     int sock;
 548     Bool isNonBlocking;
 549
 550     WCErrorCode = 0;
 551
 552     wassertrv(service!=NULL && service[0]!=0, NULL);
 553
 554     if (host==NULL || host[0]==0)
 555         host = "localhost";
 556
 557     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 558         wwarning("Bad address-service-protocol combination");
 559         return NULL;
 560     }
 561
 562     /* Create the actual socket */
 563     sock = socket(PF_INET, SOCK_STREAM, 0);
 564     if (sock<0) {
 565         WCErrorCode = errno;
 566         return NULL;
 567     }
 568     isNonBlocking = setSocketNonBlocking(sock, True);
 569     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 570         if (errno!=EINPROGRESS) {
 571             WCErrorCode = errno;
 572             close(sock);
 573             return NULL;
 574         }
 575     }
 576
 577     cPtr = createConnectionWithSocket(sock, True);
 578     cPtr->state = WCInProgress;
 579     cPtr->isNonBlocking = isNonBlocking;
 580
 581     cPtr->handler.write = WMAddInputHandler(cPtr->sock, WIWriteMask,
 582                                             inputHandler, cPtr);
 583
 584     cPtr->openTimeout.handler =
 585         WMAddTimerHandler(cPtr->openTimeout.timeout*1000, openTimeout, cPtr);
 586
 587     setConnectionAddress(cPtr, socketaddr);
 588
 589     return cPtr;
 590 }
 591
 592
 593 static void
 594 removeAllHandlers(WMConnection *cPtr) /*FOLD00*/
 595 {
 596     if (cPtr->handler.read)
 597         WMDeleteInputHandler(cPtr->handler.read);
 598     if (cPtr->handler.write)
 599         WMDeleteInputHandler(cPtr->handler.write);
 600     if (cPtr->handler.exception)
 601         WMDeleteInputHandler(cPtr->handler.exception);
 602     if (cPtr->openTimeout.handler)
 603         WMDeleteTimerHandler(cPtr->openTimeout.handler);
 604     if (cPtr->sendTimeout.handler)
 605         WMDeleteTimerHandler(cPtr->sendTimeout.handler);
 606
 607     cPtr->handler.read = NULL;
 608     cPtr->handler.write = NULL;
 609     cPtr->handler.exception = NULL;
 610     cPtr->openTimeout.handler = NULL;
 611     cPtr->sendTimeout.handler = NULL;
 612 }
 613
 614
 615 void
 616 WMDestroyConnection(WMConnection *cPtr) /*FOLD00*/
 617 {
 618     if (cPtr->closeOnRelease && cPtr->sock>=0) {
 619         shutdown(cPtr->sock, SHUT_RDWR);
 620         close(cPtr->sock);
 621     }
 622
 623     removeAllHandlers(cPtr);
 624     WMFreeArray(cPtr->outputQueue); /* will also free the items with the destructor */
 625
 626     if (cPtr->address) {
 627         wfree(cPtr->address);
 628         wfree(cPtr->service);
 629         wfree(cPtr->protocol);
 630     }
 631
 632     wrelease(cPtr);
 633 }
 634
 635
 636 void
 637 WMCloseConnection(WMConnection *cPtr) /*FOLD00*/
 638 {
 639     if (cPtr->sock>=0) {
 640         shutdown(cPtr->sock, SHUT_RDWR);
 641         close(cPtr->sock);
 642         cPtr->sock = -1;
 643     }
 644
 645     removeAllHandlers(cPtr);
 646     clearOutputQueue(cPtr);
 647
 648     cPtr->state = WCClosed;
 649 }
 650
 651
 652 WMConnection*
 653 WMAcceptConnection(WMConnection *listener) /*FOLD00*/
 654 {
 655     struct sockaddr_in clientname;
 656     int size;
 657     int newSock;
 658     WMConnection *newConnection;
 659
 660     WCErrorCode = 0;
 661     wassertrv(listener && listener->state==WCListening, NULL);
 662
 663     size = sizeof(clientname);
 664     newSock = accept(listener->sock, (struct sockaddr*) &clientname, &size);
 665     if (newSock<0) {
 666         WCErrorCode = ((errno!=EAGAIN && errno!=EWOULDBLOCK) ? errno : 0);
 667         return NULL;
 668     }
 669
 670     newConnection = createConnectionWithSocket(newSock, True);
 671     WMSetConnectionNonBlocking(newConnection, True);
 672     newConnection->state = WCConnected;
 673     setConnectionAddress(newConnection, &clientname);
 674
 675     return newConnection;
 676 }
 677
 678
 679 char*
 680 WMGetConnectionAddress(WMConnection *cPtr) /*FOLD00*/
 681 {
 682     return cPtr->address;
 683 }
 684
 685
 686 char*
 687 WMGetConnectionService(WMConnection *cPtr) /*FOLD00*/
 688 {
 689     return cPtr->service;
 690 }
 691
 692
 693 char*
 694 WMGetConnectionProtocol(WMConnection *cPtr) /*FOLD00*/
 695 {
 696     return cPtr->protocol;
 697 }
 698
 699
 700 int
 701 WMGetConnectionSocket(WMConnection *cPtr) /*FOLD00*/
 702 {
 703     return cPtr->sock;
 704 }
 705
 706
 707 WMConnectionState
 708 WMGetConnectionState(WMConnection *cPtr) /*FOLD00*/
 709 {
 710     return cPtr->state;
 711 }
 712
 713
 714 WMConnectionTimeoutState
 715 WMGetConnectionTimeoutState(WMConnection *cPtr) /*FOLD00*/
 716 {
 717     return cPtr->timeoutState;
 718 }
 719
 720
 721 Bool
 722 WMEnqueueConnectionData(WMConnection *cPtr, WMData *data) /*FOLD00*/
 723 {
 724     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, False);
 725     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, False);
 726
 727     if (cPtr->state!=WCConnected)
 728         return False;
 729
 730     WMAddToArray(cPtr->outputQueue, WMRetainData(data));
 731     return True;
 732 }
 733
 734
 735 int
 736 WMSendConnectionData(WMConnection *cPtr, WMData *data) /*FOLD00*/
 737 {
 738     int bytes, pos, len, totalTransfer;
 739     TimeoutData *tPtr = &cPtr->sendTimeout;
 740     const unsigned char *dataBytes;
 741
 742     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, -1);
 743     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, -1);
 744
 745     if (cPtr->state!=WCConnected)
 746         return -1;
 747
 748     /* If we have no data just flush the queue, else try to send data */
 749     if (data && WMGetDataLength(data)>0) {
 750         WMAddToArray(cPtr->outputQueue, WMRetainData(data));
 751         /* If there already was something in queue, and also a write input
 752          * handler is established, it means we were unable to send, so
 753          * return and let the write handler notify us when we can send.
 754          */
 755         if (WMGetArrayItemCount(cPtr->outputQueue)>1 && cPtr->handler.write)
 756             return 0;
 757     }
 758
 759     totalTransfer = 0;
 760
 761     while (WMGetArrayItemCount(cPtr->outputQueue) > 0) {
 762         data = WMGetFromArray(cPtr->outputQueue, 0);
 763         dataBytes = (const unsigned char *)WMDataBytes(data);
 764         len = WMGetDataLength(data);
 765         pos = cPtr->bufPos; /* where we're left last time */
 766         while(pos < len) {
 767         again:
 768             bytes = write(cPtr->sock, dataBytes+pos, len - pos);
 769             if(bytes<0) {
 770                 switch (errno) {
 771                 case EINTR:
 772                     goto again;
 773                 case EWOULDBLOCK:
 774                     /* save the position where we're left and add a timeout */
 775                     cPtr->bufPos = pos;
 776                     if (!tPtr->handler) {
 777                         tPtr->handler = WMAddTimerHandler(tPtr->timeout*1000,
 778                                                           sendTimeout, cPtr);
 779                     }
 780                     if (!cPtr->handler.write) {
 781                         cPtr->handler.write =
 782                             WMAddInputHandler(cPtr->sock, WIWriteMask,
 783                                               inputHandler, cPtr);
 784                     }
 785                     return totalTransfer;
 786                 default:
 787                     WCErrorCode = errno;
 788                     cPtr->state = WCDied;
 789                     removeAllHandlers(cPtr);
 790                     if (cPtr->delegate && cPtr->delegate->didDie)
 791                         (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 792                     return -1;
 793                 }
 794             }
 795             pos += bytes;
 796             totalTransfer += bytes;
 797         }
 798         WMDeleteFromArray(cPtr->outputQueue, 0);
 799         cPtr->bufPos = 0;
 800         if (tPtr->handler) {
 801             WMDeleteTimerHandler(tPtr->handler);
 802             tPtr->handler = NULL;
 803         }
 804         if (cPtr->handler.write) {
 805             WMDeleteInputHandler(cPtr->handler.write);
 806             cPtr->handler.write = NULL;
 807         }
 808     }
 809
 810     return totalTransfer;
 811 }
 812
 813
 814 /*
 815  * WMGetConnectionAvailableData(connection):
 816  *
 817  * will return a WMData structure containing the available data on the
 818  * specified connection. If connection is non-blocking (default) and no data
 819  * is available when this function is called, an empty WMData is returned.
 820  *
 821  * If an error occurs while reading or the other side closed connection,
 822  * it will return NULL.
 823  * Also trying to read from an already died or closed connection is
 824  * considered to be an error condition, and will return NULL.
 825  */
 826 WMData*
 827 WMGetConnectionAvailableData(WMConnection *cPtr) /*FOLD00*/
 828 {
 829     char buffer[NETBUF_SIZE];
 830     int nbytes;
 831     WMData *aData;
 832
 833     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, NULL);
 834     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, NULL);
 835
 836     if (cPtr->state!=WCConnected)
 837         return NULL;
 838
 839     aData = NULL;
 840
 841 again:
 842     nbytes = read(cPtr->sock, buffer, NETBUF_SIZE);
 843     if (nbytes<0) {
 844         switch (errno) {
 845         case EINTR:
 846             goto again;
 847         case EWOULDBLOCK:
 848             aData = WMCreateDataWithCapacity(0);
 849             break;
 850         default:
 851             WCErrorCode = errno;
 852             cPtr->state = WCDied;
 853             removeAllHandlers(cPtr);
 854             if (cPtr->delegate && cPtr->delegate->didDie)
 855                 (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 856             break;
 857         }
 858     } else if (nbytes==0) {      /* the other side has closed connection */
 859         cPtr->state = WCClosed;
 860         removeAllHandlers(cPtr);
 861         if (cPtr->delegate && cPtr->delegate->didDie)
 862             (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 863     } else {
 864         aData = WMCreateDataWithBytes(buffer, nbytes);
 865     }
 866
 867     return aData;
 868 }
 869
 870
 871 void
 872 WMSetConnectionDelegate(WMConnection *cPtr, ConnectionDelegate *delegate) /*FOLD00*/
 873 {
 874     wassertr(cPtr->sock >= 0);
 875     /* Don't try to set the delegate multiple times */
 876     wassertr(cPtr->delegate == NULL);
 877
 878     cPtr->delegate = delegate;
 879     if (delegate && delegate->didReceiveInput && !cPtr->handler.read)
 880         cPtr->handler.read = WMAddInputHandler(cPtr->sock, WIReadMask,
 881                                                inputHandler, cPtr);
 882     if (delegate && delegate->didCatchException && !cPtr->handler.exception)
 883         cPtr->handler.exception = WMAddInputHandler(cPtr->sock, WIExceptMask,
 884                                                     inputHandler, cPtr);
 885 }
 886
 887
 888 #if 0
 889 Bool
 890 WMIsConnectionNonBlocking(WMConnection *cPtr) /*FOLD00*/
 891 {
 892 #if 1
 893     int state;
 894
 895     state = fcntl(cPtr->sock, F_GETFL, 0);
 896
 897     if (state < 0) {
 898         /* If we can't use fcntl on socket, this probably also means we could
 899          * not use fcntl to set non-blocking mode, and since a socket defaults
 900          * to blocking when created, return False as the best assumption */
 901         return False;
 902     }
 903
 904     return ((state & NONBLOCK_OPT)!=0);
 905 #else
 906     return cPtr->isNonBlocking;
 907 #endif
 908 }
 909 #endif
 910
 911
 912 Bool
 913 WMSetConnectionNonBlocking(WMConnection *cPtr, Bool flag) /*FOLD00*/
 914 {
 915     wassertrv(cPtr!=NULL && cPtr->sock>=0, False);
 916
 917     if (cPtr->isNonBlocking == flag)
 918         return True;
 919
 920     if (setSocketNonBlocking(cPtr->sock, flag)==True) {
 921         cPtr->isNonBlocking = flag;
 922         return True;
 923     }
 924
 925     return False;
 926 }
 927
 928
 929 Bool
 930 WMSetConnectionCloseOnExec(WMConnection *cPtr, Bool flag)
 931 {
 932     wassertrv(cPtr!=NULL && cPtr->sock>=0, False);
 933
 934     if (fcntl(cPtr->sock, F_SETFD, (flag ? FD_CLOEXEC : 0)) < 0) {
 935         return False;
 936     }
 937
 938     return True;
 939 }
 940
 941
 942 void*
 943 WMGetConnectionClientData(WMConnection *cPtr) /*FOLD00*/
 944 {
 945     return cPtr->clientData;
 946 }
 947
 948
 949 void
 950 WMSetConnectionClientData(WMConnection *cPtr, void *data) /*FOLD00*/
 951 {
 952     cPtr->clientData = data;
 953 }
 954
 955
 956 unsigned int
 957 WMGetConnectionFlags(WMConnection *cPtr) /*FOLD00*/
 958 {
 959     return cPtr->uflags;
 960 }
 961
 962
 963 void
 964 WMSetConnectionFlags(WMConnection *cPtr, unsigned int flags) /*FOLD00*/
 965 {
 966     cPtr->uflags = flags;
 967 }
 968
 969
 970 WMArray*
 971 WMGetConnectionUnsentData(WMConnection *cPtr)
 972 {
 973     return cPtr->outputQueue;
 974 }
 975
 976
 977 void
 978 WMSetConnectionDefaultTimeout(unsigned int timeout) /*FOLD00*/
 979 {
 980     if (timeout == 0) {
 981         DefaultTimeout = DEF_TIMEOUT;
 982     } else {
 983         DefaultTimeout = timeout;
 984     }
 985 }
 986
 987
 988 void
 989 WMSetConnectionOpenTimeout(unsigned int timeout) /*FOLD00*/
 990 {
 991     if (timeout == 0) {
 992         OpenTimeout = DefaultTimeout;
 993     } else {
 994         OpenTimeout = timeout;
 995     }
 996 }
 997
 998
 999 void
1000 WMSetConnectionSendTimeout(WMConnection *cPtr, unsigned int timeout) /*FOLD00*/
1001 {
1002     if (timeout == 0) {
1003         cPtr->sendTimeout.timeout = DefaultTimeout;
1004     } else {
1005         cPtr->sendTimeout.timeout = timeout;
1006     }
1007 }
1008
1009