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