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 #include "wconfig.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 void
 357 dummyHandler(int signum)
 358 {
 359 }
 360
 361
 362 static WMConnection*
 363 createConnectionWithSocket(int sock, Bool closeOnRelease) /*FOLD00*/
 364 {
 365     WMConnection *cPtr;
 366     struct sigaction sig_action;
 367
 368     cPtr = wmalloc(sizeof(WMConnection));
 369     wretain(cPtr);
 370     memset(cPtr, 0, sizeof(WMConnection));
 371
 372     fcntl(sock, F_SETFD, FD_CLOEXEC); /* by default close on exec */
 373
 374     cPtr->sock = sock;
 375     cPtr->openTimeout.timeout = OpenTimeout;
 376     cPtr->openTimeout.handler = NULL;
 377     cPtr->sendTimeout.timeout = DefaultTimeout;
 378     cPtr->sendTimeout.handler = NULL;
 379     cPtr->closeOnRelease = closeOnRelease;
 380     cPtr->outputQueue =
 381         WMCreateArrayWithDestructor(16, (WMFreeDataProc*)WMReleaseData);
 382     cPtr->state = WCNotConnected;
 383     cPtr->timeoutState = WCTNone;
 384
 385     /* ignore dead pipe */
 386     if (!SigInitialized) {
 387         /* Because POSIX mandates that only signal with handlers are reset
 388          * accross an exec*(), we do not want to propagate ignoring SIGPIPEs
 389          * to children. Hence the dummy handler. Philippe Troin <phil@fifi.org>
 390          */
 391         sig_action.sa_handler = &dummyHandler;
 392         sig_action.sa_flags = SA_RESTART;
 393         sigaction(SIGPIPE, &sig_action, NULL);
 394         SigInitialized = True;
 395     }
 396
 397     return cPtr;
 398 }
 399
 400
 401 #if 0
 402 WMConnection*
 403 WMCreateConnectionWithSocket(int sock, Bool closeOnRelease) /*FOLD00*/
 404 {
 405     WMConnection *cPtr;
 406     struct sockaddr_in clientname;
 407     int size;
 408     int n;
 409
 410     cPtr = createConnectionWithSocket(sock, closeOnRelease);
 411     cPtr->wasNonBlocking = WMIsConnectionNonBlocking(cPtr);
 412     cPtr->isNonBlocking = cPtr->wasNonBlocking;
 413
 414     /* some way to find out if it is connected, and binded. can't find
 415        if it listens though!!!
 416     */
 417
 418     size = sizeof(clientname);
 419     n = getpeername(sock, (struct sockaddr*) &clientname, &size);
 420     if (n==0) {
 421         /* Since we have a peer, it means we are connected */
 422         cPtr->state = WCConnected;
 423     } else {
 424         size = sizeof(clientname);
 425         n = getsockname(sock, (struct sockaddr*) &clientname, &size);
 426         if (n==0) {
 427             /* We don't have a peer, but we are binded to an address.
 428              * Assume we are listening on it (we don't know that for sure!)
 429              */
 430             cPtr->state = WCListening;
 431         } else {
 432             cPtr->state = WCNotConnected;
 433         }
 434     }
 435
 436     return cPtr;
 437 }
 438 #endif
 439
 440
 441 /*
 442  * host     is the name on which we want to listen for incoming connections,
 443  *          and it must be a name of this host, or NULL if we want to listen
 444  *          on any incoming address.
 445  * service  is either a service name as present in /etc/services, or the port
 446  *          number we want to listen on. If NULL, a random port between
 447  *          1024 and 65535 will be assigned to us.
 448  * protocol is one of "tcp" or "udp". If NULL, "tcp" will be used by default.
 449  *          currently only "tcp" is supported.
 450  */
 451 WMConnection*
 452 WMCreateConnectionAsServerAtAddress(char *host, char *service, char *protocol) /*FOLD00*/
 453 {
 454     WMConnection *cPtr;
 455     struct sockaddr_in *socketaddr;
 456     int sock, on;
 457     int size;
 458
 459     WCErrorCode = 0;
 460
 461     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 462         wwarning(_("Bad address-service-protocol combination"));
 463         return NULL;
 464     }
 465
 466     /* Create the actual socket */
 467     sock = socket(PF_INET, SOCK_STREAM, 0);
 468     if (sock<0) {
 469         WCErrorCode = errno;
 470         return NULL;
 471     }
 472
 473     /*
 474      * Set socket options. We try to make the port reusable and have it
 475      * close as fast as possible without waiting in unnecessary wait states
 476      * on close.
 477      */
 478     on = 1;
 479     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
 480
 481     if (bind(sock, (struct sockaddr *)socketaddr, sizeof(*socketaddr)) < 0) {
 482         WCErrorCode = errno;
 483         close(sock);
 484         return NULL;
 485     }
 486
 487     if (listen(sock, 10) < 0) {
 488         WCErrorCode = errno;
 489         close(sock);
 490         return NULL;
 491     }
 492
 493     /* Find out what is the address/service/protocol we get */
 494     /* In case some of address/service/protocol were NULL */
 495     size = sizeof(*socketaddr);
 496     if (getsockname(sock, (struct sockaddr*)socketaddr, &size) < 0) {
 497         WCErrorCode = errno;
 498         close(sock);
 499         return NULL;
 500     }
 501
 502     cPtr = createConnectionWithSocket(sock, True);
 503     cPtr->state = WCListening;
 504     WMSetConnectionNonBlocking(cPtr, True);
 505
 506     setConnectionAddress(cPtr, socketaddr);
 507
 508     return cPtr;
 509 }
 510
 511
 512 WMConnection*
 513 WMCreateConnectionToAddress(char *host, char *service, char *protocol) /*FOLD00*/
 514 {
 515     WMConnection *cPtr;
 516     struct sockaddr_in *socketaddr;
 517     int sock;
 518
 519     WCErrorCode = 0;
 520
 521     wassertrv(service!=NULL && service[0]!=0, NULL);
 522
 523     if (host==NULL || host[0]==0)
 524         host = "localhost";
 525
 526     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 527         wwarning(_("Bad address-service-protocol combination"));
 528         return NULL;
 529     }
 530
 531     /* Create the actual socket */
 532     sock = socket(PF_INET, SOCK_STREAM, 0);
 533     if (sock<0) {
 534         WCErrorCode = errno;
 535         return NULL;
 536     }
 537     /* make socket blocking while we connect. */
 538     setSocketNonBlocking(sock, False);
 539     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 540         WCErrorCode = errno;
 541         close(sock);
 542         return NULL;
 543     }
 544
 545     cPtr = createConnectionWithSocket(sock, True);
 546     cPtr->state = WCConnected;
 547     WMSetConnectionNonBlocking(cPtr, True);
 548     setConnectionAddress(cPtr, socketaddr);
 549
 550     return cPtr;
 551 }
 552
 553
 554 WMConnection*
 555 WMCreateConnectionToAddressAndNotify(char *host, char *service, char *protocol) /*FOLD00*/
 556 {
 557     WMConnection *cPtr;
 558     struct sockaddr_in *socketaddr;
 559     int sock;
 560     Bool isNonBlocking;
 561
 562     WCErrorCode = 0;
 563
 564     wassertrv(service!=NULL && service[0]!=0, NULL);
 565
 566     if (host==NULL || host[0]==0)
 567         host = "localhost";
 568
 569     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 570         wwarning(_("Bad address-service-protocol combination"));
 571         return NULL;
 572     }
 573
 574     /* Create the actual socket */
 575     sock = socket(PF_INET, SOCK_STREAM, 0);
 576     if (sock<0) {
 577         WCErrorCode = errno;
 578         return NULL;
 579     }
 580     isNonBlocking = setSocketNonBlocking(sock, True);
 581     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 582         if (errno!=EINPROGRESS) {
 583             WCErrorCode = errno;
 584             close(sock);
 585             return NULL;
 586         }
 587     }
 588
 589     cPtr = createConnectionWithSocket(sock, True);
 590     cPtr->state = WCInProgress;
 591     cPtr->isNonBlocking = isNonBlocking;
 592
 593     cPtr->handler.write = WMAddInputHandler(cPtr->sock, WIWriteMask,
 594                                             inputHandler, cPtr);
 595
 596     cPtr->openTimeout.handler =
 597         WMAddTimerHandler(cPtr->openTimeout.timeout*1000, openTimeout, cPtr);
 598
 599     setConnectionAddress(cPtr, socketaddr);
 600
 601     return cPtr;
 602 }
 603
 604
 605 static void
 606 removeAllHandlers(WMConnection *cPtr) /*FOLD00*/
 607 {
 608     if (cPtr->handler.read)
 609         WMDeleteInputHandler(cPtr->handler.read);
 610     if (cPtr->handler.write)
 611         WMDeleteInputHandler(cPtr->handler.write);
 612     if (cPtr->handler.exception)
 613         WMDeleteInputHandler(cPtr->handler.exception);
 614     if (cPtr->openTimeout.handler)
 615         WMDeleteTimerHandler(cPtr->openTimeout.handler);
 616     if (cPtr->sendTimeout.handler)
 617         WMDeleteTimerHandler(cPtr->sendTimeout.handler);
 618
 619     cPtr->handler.read = NULL;
 620     cPtr->handler.write = NULL;
 621     cPtr->handler.exception = NULL;
 622     cPtr->openTimeout.handler = NULL;
 623     cPtr->sendTimeout.handler = NULL;
 624 }
 625
 626
 627 void
 628 WMDestroyConnection(WMConnection *cPtr) /*FOLD00*/
 629 {
 630     if (cPtr->closeOnRelease && cPtr->sock>=0) {
 631         shutdown(cPtr->sock, SHUT_RDWR);
 632         close(cPtr->sock);
 633     }
 634
 635     removeAllHandlers(cPtr);
 636     WMFreeArray(cPtr->outputQueue); /* will also free the items with the destructor */
 637
 638     if (cPtr->address) {
 639         wfree(cPtr->address);
 640         wfree(cPtr->service);
 641         wfree(cPtr->protocol);
 642     }
 643
 644     wrelease(cPtr);
 645 }
 646
 647
 648 void
 649 WMCloseConnection(WMConnection *cPtr) /*FOLD00*/
 650 {
 651     if (cPtr->sock>=0) {
 652         shutdown(cPtr->sock, SHUT_RDWR);
 653         close(cPtr->sock);
 654         cPtr->sock = -1;
 655     }
 656
 657     removeAllHandlers(cPtr);
 658     clearOutputQueue(cPtr);
 659
 660     cPtr->state = WCClosed;
 661 }
 662
 663
 664 WMConnection*
 665 WMAcceptConnection(WMConnection *listener) /*FOLD00*/
 666 {
 667     struct sockaddr_in clientname;
 668     int size;
 669     int newSock;
 670     WMConnection *newConnection;
 671
 672     WCErrorCode = 0;
 673     wassertrv(listener && listener->state==WCListening, NULL);
 674
 675     size = sizeof(clientname);
 676     newSock = accept(listener->sock, (struct sockaddr*) &clientname, &size);
 677     if (newSock<0) {
 678         WCErrorCode = ((errno!=EAGAIN && errno!=EWOULDBLOCK) ? errno : 0);
 679         return NULL;
 680     }
 681
 682     newConnection = createConnectionWithSocket(newSock, True);
 683     WMSetConnectionNonBlocking(newConnection, True);
 684     newConnection->state = WCConnected;
 685     setConnectionAddress(newConnection, &clientname);
 686
 687     return newConnection;
 688 }
 689
 690
 691 char*
 692 WMGetConnectionAddress(WMConnection *cPtr) /*FOLD00*/
 693 {
 694     return cPtr->address;
 695 }
 696
 697
 698 char*
 699 WMGetConnectionService(WMConnection *cPtr) /*FOLD00*/
 700 {
 701     return cPtr->service;
 702 }
 703
 704
 705 char*
 706 WMGetConnectionProtocol(WMConnection *cPtr) /*FOLD00*/
 707 {
 708     return cPtr->protocol;
 709 }
 710
 711
 712 int
 713 WMGetConnectionSocket(WMConnection *cPtr) /*FOLD00*/
 714 {
 715     return cPtr->sock;
 716 }
 717
 718
 719 WMConnectionState
 720 WMGetConnectionState(WMConnection *cPtr) /*FOLD00*/
 721 {
 722     return cPtr->state;
 723 }
 724
 725
 726 WMConnectionTimeoutState
 727 WMGetConnectionTimeoutState(WMConnection *cPtr) /*FOLD00*/
 728 {
 729     return cPtr->timeoutState;
 730 }
 731
 732
 733 Bool
 734 WMEnqueueConnectionData(WMConnection *cPtr, WMData *data) /*FOLD00*/
 735 {
 736     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, False);
 737     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, False);
 738
 739     if (cPtr->state!=WCConnected)
 740         return False;
 741
 742     WMAddToArray(cPtr->outputQueue, WMRetainData(data));
 743     return True;
 744 }
 745
 746
 747 int
 748 WMSendConnectionData(WMConnection *cPtr, WMData *data) /*FOLD00*/
 749 {
 750     int bytes, pos, len, totalTransfer;
 751     TimeoutData *tPtr = &cPtr->sendTimeout;
 752     const unsigned char *dataBytes;
 753
 754     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, -1);
 755     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, -1);
 756
 757     if (cPtr->state!=WCConnected)
 758         return -1;
 759
 760     /* If we have no data just flush the queue, else try to send data */
 761     if (data && WMGetDataLength(data)>0) {
 762         WMAddToArray(cPtr->outputQueue, WMRetainData(data));
 763         /* If there already was something in queue, and also a write input
 764          * handler is established, it means we were unable to send, so
 765          * return and let the write handler notify us when we can send.
 766          */
 767         if (WMGetArrayItemCount(cPtr->outputQueue)>1 && cPtr->handler.write)
 768             return 0;
 769     }
 770
 771     totalTransfer = 0;
 772
 773     while (WMGetArrayItemCount(cPtr->outputQueue) > 0) {
 774         data = WMGetFromArray(cPtr->outputQueue, 0);
 775         dataBytes = (const unsigned char *)WMDataBytes(data);
 776         len = WMGetDataLength(data);
 777         pos = cPtr->bufPos; /* where we're left last time */
 778         while(pos < len) {
 779         again:
 780             bytes = write(cPtr->sock, dataBytes+pos, len - pos);
 781             if(bytes<0) {
 782                 switch (errno) {
 783                 case EINTR:
 784                     goto again;
 785                 case EWOULDBLOCK:
 786                     /* save the position where we're left and add a timeout */
 787                     cPtr->bufPos = pos;
 788                     if (!tPtr->handler) {
 789                         tPtr->handler = WMAddTimerHandler(tPtr->timeout*1000,
 790                                                           sendTimeout, cPtr);
 791                     }
 792                     if (!cPtr->handler.write) {
 793                         cPtr->handler.write =
 794                             WMAddInputHandler(cPtr->sock, WIWriteMask,
 795                                               inputHandler, cPtr);
 796                     }
 797                     return totalTransfer;
 798                 default:
 799                     WCErrorCode = errno;
 800                     cPtr->state = WCDied;
 801                     removeAllHandlers(cPtr);
 802                     if (cPtr->delegate && cPtr->delegate->didDie)
 803                         (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 804                     return -1;
 805                 }
 806             }
 807             pos += bytes;
 808             totalTransfer += bytes;
 809         }
 810         WMDeleteFromArray(cPtr->outputQueue, 0);
 811         cPtr->bufPos = 0;
 812         if (tPtr->handler) {
 813             WMDeleteTimerHandler(tPtr->handler);
 814             tPtr->handler = NULL;
 815         }
 816         if (cPtr->handler.write) {
 817             WMDeleteInputHandler(cPtr->handler.write);
 818             cPtr->handler.write = NULL;
 819         }
 820     }
 821
 822     return totalTransfer;
 823 }
 824
 825
 826 /*
 827  * WMGetConnectionAvailableData(connection):
 828  *
 829  * will return a WMData structure containing the available data on the
 830  * specified connection. If connection is non-blocking (default) and no data
 831  * is available when this function is called, an empty WMData is returned.
 832  *
 833  * If an error occurs while reading or the other side closed connection,
 834  * it will return NULL.
 835  * Also trying to read from an already died or closed connection is
 836  * considered to be an error condition, and will return NULL.
 837  */
 838 WMData*
 839 WMGetConnectionAvailableData(WMConnection *cPtr) /*FOLD00*/
 840 {
 841     char buffer[NETBUF_SIZE];
 842     int nbytes;
 843     WMData *aData;
 844
 845     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, NULL);
 846     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, NULL);
 847
 848     if (cPtr->state!=WCConnected)
 849         return NULL;
 850
 851     aData = NULL;
 852
 853 again:
 854     nbytes = read(cPtr->sock, buffer, NETBUF_SIZE);
 855     if (nbytes<0) {
 856         switch (errno) {
 857         case EINTR:
 858             goto again;
 859         case EWOULDBLOCK:
 860             aData = WMCreateDataWithCapacity(0);
 861             break;
 862         default:
 863             WCErrorCode = errno;
 864             cPtr->state = WCDied;
 865             removeAllHandlers(cPtr);
 866             if (cPtr->delegate && cPtr->delegate->didDie)
 867                 (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 868             break;
 869         }
 870     } else if (nbytes==0) {      /* the other side has closed connection */
 871         cPtr->state = WCClosed;
 872         removeAllHandlers(cPtr);
 873         if (cPtr->delegate && cPtr->delegate->didDie)
 874             (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 875     } else {
 876         aData = WMCreateDataWithBytes(buffer, nbytes);
 877     }
 878
 879     return aData;
 880 }
 881
 882
 883 void
 884 WMSetConnectionDelegate(WMConnection *cPtr, ConnectionDelegate *delegate) /*FOLD00*/
 885 {
 886     wassertr(cPtr->sock >= 0);
 887     /* Don't try to set the delegate multiple times */
 888     wassertr(cPtr->delegate == NULL);
 889
 890     cPtr->delegate = delegate;
 891     if (delegate && delegate->didReceiveInput && !cPtr->handler.read)
 892         cPtr->handler.read = WMAddInputHandler(cPtr->sock, WIReadMask,
 893                                                inputHandler, cPtr);
 894     if (delegate && delegate->didCatchException && !cPtr->handler.exception)
 895         cPtr->handler.exception = WMAddInputHandler(cPtr->sock, WIExceptMask,
 896                                                     inputHandler, cPtr);
 897 }
 898
 899
 900 #if 0
 901 Bool
 902 WMIsConnectionNonBlocking(WMConnection *cPtr) /*FOLD00*/
 903 {
 904 #if 1
 905     int state;
 906
 907     state = fcntl(cPtr->sock, F_GETFL, 0);
 908
 909     if (state < 0) {
 910         /* If we can't use fcntl on socket, this probably also means we could
 911          * not use fcntl to set non-blocking mode, and since a socket defaults
 912          * to blocking when created, return False as the best assumption */
 913         return False;
 914     }
 915
 916     return ((state & NONBLOCK_OPT)!=0);
 917 #else
 918     return cPtr->isNonBlocking;
 919 #endif
 920 }
 921 #endif
 922
 923
 924 Bool
 925 WMSetConnectionNonBlocking(WMConnection *cPtr, Bool flag) /*FOLD00*/
 926 {
 927     wassertrv(cPtr!=NULL && cPtr->sock>=0, False);
 928
 929     if (cPtr->isNonBlocking == flag)
 930         return True;
 931
 932     if (setSocketNonBlocking(cPtr->sock, flag)==True) {
 933         cPtr->isNonBlocking = flag;
 934         return True;
 935     }
 936
 937     return False;
 938 }
 939
 940
 941 Bool
 942 WMSetConnectionCloseOnExec(WMConnection *cPtr, Bool flag)
 943 {
 944     wassertrv(cPtr!=NULL && cPtr->sock>=0, False);
 945
 946     if (fcntl(cPtr->sock, F_SETFD, (flag ? FD_CLOEXEC : 0)) < 0) {
 947         return False;
 948     }
 949
 950     return True;
 951 }
 952
 953
 954 void*
 955 WMGetConnectionClientData(WMConnection *cPtr) /*FOLD00*/
 956 {
 957     return cPtr->clientData;
 958 }
 959
 960
 961 void
 962 WMSetConnectionClientData(WMConnection *cPtr, void *data) /*FOLD00*/
 963 {
 964     cPtr->clientData = data;
 965 }
 966
 967
 968 unsigned int
 969 WMGetConnectionFlags(WMConnection *cPtr) /*FOLD00*/
 970 {
 971     return cPtr->uflags;
 972 }
 973
 974
 975 void
 976 WMSetConnectionFlags(WMConnection *cPtr, unsigned int flags) /*FOLD00*/
 977 {
 978     cPtr->uflags = flags;
 979 }
 980
 981
 982 WMArray*
 983 WMGetConnectionUnsentData(WMConnection *cPtr)
 984 {
 985     return cPtr->outputQueue;
 986 }
 987
 988
 989 void
 990 WMSetConnectionDefaultTimeout(unsigned int timeout) /*FOLD00*/
 991 {
 992     if (timeout == 0) {
 993         DefaultTimeout = DEF_TIMEOUT;
 994     } else {
 995         DefaultTimeout = timeout;
 996     }
 997 }
 998
 999
1000 void
1001 WMSetConnectionOpenTimeout(unsigned int timeout) /*FOLD00*/
1002 {
1003     if (timeout == 0) {
1004         OpenTimeout = DefaultTimeout;
1005     } else {
1006         OpenTimeout = timeout;
1007     }
1008 }
1009
1010
1011 void
1012 WMSetConnectionSendTimeout(WMConnection *cPtr, unsigned int timeout) /*FOLD00*/
1013 {
1014     if (timeout == 0) {
1015         cPtr->sendTimeout.timeout = DefaultTimeout;
1016     } else {
1017         cPtr->sendTimeout.timeout = timeout;
1018     }
1019 }
1020
1021