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 "wconfig.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)
 133 {
 134     cPtr->bufPos = 0;
 135     WMEmptyArray(cPtr->outputQueue);
 136 }
 137
 138
 139 static void
 140 openTimeout(void *cdata)
 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)
 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)
 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)
 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)
 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)
 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 void
 356 dummyHandler(int signum)
 357 {
 358 }
 359
 360
 361 static WMConnection*
 362 createConnectionWithSocket(int sock, Bool closeOnRelease)
 363 {
 364     WMConnection *cPtr;
 365     struct sigaction sig_action;
 366
 367     cPtr = wmalloc(sizeof(WMConnection));
 368     wretain(cPtr);
 369     memset(cPtr, 0, sizeof(WMConnection));
 370
 371     fcntl(sock, F_SETFD, FD_CLOEXEC); /* by default close on exec */
 372
 373     cPtr->sock = sock;
 374     cPtr->openTimeout.timeout = OpenTimeout;
 375     cPtr->openTimeout.handler = NULL;
 376     cPtr->sendTimeout.timeout = DefaultTimeout;
 377     cPtr->sendTimeout.handler = NULL;
 378     cPtr->closeOnRelease = closeOnRelease;
 379     cPtr->outputQueue =
 380         WMCreateArrayWithDestructor(16, (WMFreeDataProc*)WMReleaseData);
 381     cPtr->state = WCNotConnected;
 382     cPtr->timeoutState = WCTNone;
 383
 384     /* ignore dead pipe */
 385     if (!SigInitialized) {
 386         /* Because POSIX mandates that only signal with handlers are reset
 387          * accross an exec*(), we do not want to propagate ignoring SIGPIPEs
 388          * to children. Hence the dummy handler. Philippe Troin <phil@fifi.org>
 389          */
 390         sig_action.sa_handler = &dummyHandler;
 391         sig_action.sa_flags = SA_RESTART;
 392         sigaction(SIGPIPE, &sig_action, NULL);
 393         SigInitialized = True;
 394     }
 395
 396     return cPtr;
 397 }
 398
 399
 400 #if 0
 401 WMConnection*
 402 WMCreateConnectionWithSocket(int sock, Bool closeOnRelease)
 403 {
 404     WMConnection *cPtr;
 405     struct sockaddr_in clientname;
 406     int size;
 407     int n;
 408
 409     cPtr = createConnectionWithSocket(sock, closeOnRelease);
 410     cPtr->wasNonBlocking = WMIsConnectionNonBlocking(cPtr);
 411     cPtr->isNonBlocking = cPtr->wasNonBlocking;
 412
 413     /* some way to find out if it is connected, and binded. can't find
 414        if it listens though!!!
 415     */
 416
 417     size = sizeof(clientname);
 418     n = getpeername(sock, (struct sockaddr*) &clientname, &size);
 419     if (n==0) {
 420         /* Since we have a peer, it means we are connected */
 421         cPtr->state = WCConnected;
 422     } else {
 423         size = sizeof(clientname);
 424         n = getsockname(sock, (struct sockaddr*) &clientname, &size);
 425         if (n==0) {
 426             /* We don't have a peer, but we are binded to an address.
 427              * Assume we are listening on it (we don't know that for sure!)
 428              */
 429             cPtr->state = WCListening;
 430         } else {
 431             cPtr->state = WCNotConnected;
 432         }
 433     }
 434
 435     return cPtr;
 436 }
 437 #endif
 438
 439
 440 /*
 441  * host     is the name on which we want to listen for incoming connections,
 442  *          and it must be a name of this host, or NULL if we want to listen
 443  *          on any incoming address.
 444  * service  is either a service name as present in /etc/services, or the port
 445  *          number we want to listen on. If NULL, a random port between
 446  *          1024 and 65535 will be assigned to us.
 447  * protocol is one of "tcp" or "udp". If NULL, "tcp" will be used by default.
 448  *          currently only "tcp" is supported.
 449  */
 450 WMConnection*
 451 WMCreateConnectionAsServerAtAddress(char *host, char *service, char *protocol)
 452 {
 453     WMConnection *cPtr;
 454     struct sockaddr_in *socketaddr;
 455     int sock, on;
 456     int size;
 457
 458     WCErrorCode = 0;
 459
 460     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 461         wwarning(_("Bad address-service-protocol combination"));
 462         return NULL;
 463     }
 464
 465     /* Create the actual socket */
 466     sock = socket(PF_INET, SOCK_STREAM, 0);
 467     if (sock<0) {
 468         WCErrorCode = errno;
 469         return NULL;
 470     }
 471
 472     /*
 473      * Set socket options. We try to make the port reusable and have it
 474      * close as fast as possible without waiting in unnecessary wait states
 475      * on close.
 476      */
 477     on = 1;
 478     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
 479
 480     if (bind(sock, (struct sockaddr *)socketaddr, sizeof(*socketaddr)) < 0) {
 481         WCErrorCode = errno;
 482         close(sock);
 483         return NULL;
 484     }
 485
 486     if (listen(sock, 10) < 0) {
 487         WCErrorCode = errno;
 488         close(sock);
 489         return NULL;
 490     }
 491
 492     /* Find out what is the address/service/protocol we get */
 493     /* In case some of address/service/protocol were NULL */
 494     size = sizeof(*socketaddr);
 495     if (getsockname(sock, (struct sockaddr*)socketaddr, &size) < 0) {
 496         WCErrorCode = errno;
 497         close(sock);
 498         return NULL;
 499     }
 500
 501     cPtr = createConnectionWithSocket(sock, True);
 502     cPtr->state = WCListening;
 503     WMSetConnectionNonBlocking(cPtr, True);
 504
 505     setConnectionAddress(cPtr, socketaddr);
 506
 507     return cPtr;
 508 }
 509
 510
 511 WMConnection*
 512 WMCreateConnectionToAddress(char *host, char *service, char *protocol)
 513 {
 514     WMConnection *cPtr;
 515     struct sockaddr_in *socketaddr;
 516     int sock;
 517
 518     WCErrorCode = 0;
 519
 520     wassertrv(service!=NULL && service[0]!=0, NULL);
 521
 522     if (host==NULL || host[0]==0)
 523         host = "localhost";
 524
 525     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 526         wwarning(_("Bad address-service-protocol combination"));
 527         return NULL;
 528     }
 529
 530     /* Create the actual socket */
 531     sock = socket(PF_INET, SOCK_STREAM, 0);
 532     if (sock<0) {
 533         WCErrorCode = errno;
 534         return NULL;
 535     }
 536     /* make socket blocking while we connect. */
 537     setSocketNonBlocking(sock, False);
 538     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 539         WCErrorCode = errno;
 540         close(sock);
 541         return NULL;
 542     }
 543
 544     cPtr = createConnectionWithSocket(sock, True);
 545     cPtr->state = WCConnected;
 546     WMSetConnectionNonBlocking(cPtr, True);
 547     setConnectionAddress(cPtr, socketaddr);
 548
 549     return cPtr;
 550 }
 551
 552
 553 WMConnection*
 554 WMCreateConnectionToAddressAndNotify(char *host, char *service, char *protocol)
 555 {
 556     WMConnection *cPtr;
 557     struct sockaddr_in *socketaddr;
 558     int sock;
 559     Bool isNonBlocking;
 560
 561     WCErrorCode = 0;
 562
 563     wassertrv(service!=NULL && service[0]!=0, NULL);
 564
 565     if (host==NULL || host[0]==0)
 566         host = "localhost";
 567
 568     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 569         wwarning(_("Bad address-service-protocol combination"));
 570         return NULL;
 571     }
 572
 573     /* Create the actual socket */
 574     sock = socket(PF_INET, SOCK_STREAM, 0);
 575     if (sock<0) {
 576         WCErrorCode = errno;
 577         return NULL;
 578     }
 579     isNonBlocking = setSocketNonBlocking(sock, True);
 580     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 581         if (errno!=EINPROGRESS) {
 582             WCErrorCode = errno;
 583             close(sock);
 584             return NULL;
 585         }
 586     }
 587
 588     cPtr = createConnectionWithSocket(sock, True);
 589     cPtr->state = WCInProgress;
 590     cPtr->isNonBlocking = isNonBlocking;
 591
 592     cPtr->handler.write = WMAddInputHandler(cPtr->sock, WIWriteMask,
 593                                             inputHandler, cPtr);
 594
 595     cPtr->openTimeout.handler =
 596         WMAddTimerHandler(cPtr->openTimeout.timeout*1000, openTimeout, cPtr);
 597
 598     setConnectionAddress(cPtr, socketaddr);
 599
 600     return cPtr;
 601 }
 602
 603
 604 static void
 605 removeAllHandlers(WMConnection *cPtr)
 606 {
 607     if (cPtr->handler.read)
 608         WMDeleteInputHandler(cPtr->handler.read);
 609     if (cPtr->handler.write)
 610         WMDeleteInputHandler(cPtr->handler.write);
 611     if (cPtr->handler.exception)
 612         WMDeleteInputHandler(cPtr->handler.exception);
 613     if (cPtr->openTimeout.handler)
 614         WMDeleteTimerHandler(cPtr->openTimeout.handler);
 615     if (cPtr->sendTimeout.handler)
 616         WMDeleteTimerHandler(cPtr->sendTimeout.handler);
 617
 618     cPtr->handler.read = NULL;
 619     cPtr->handler.write = NULL;
 620     cPtr->handler.exception = NULL;
 621     cPtr->openTimeout.handler = NULL;
 622     cPtr->sendTimeout.handler = NULL;
 623 }
 624
 625
 626 void
 627 WMDestroyConnection(WMConnection *cPtr)
 628 {
 629     if (cPtr->closeOnRelease && cPtr->sock>=0) {
 630         shutdown(cPtr->sock, SHUT_RDWR);
 631         close(cPtr->sock);
 632     }
 633
 634     removeAllHandlers(cPtr);
 635     WMFreeArray(cPtr->outputQueue); /* will also free the items with the destructor */
 636
 637     if (cPtr->address) {
 638         wfree(cPtr->address);
 639         wfree(cPtr->service);
 640         wfree(cPtr->protocol);
 641     }
 642
 643     wrelease(cPtr);
 644 }
 645
 646
 647 void
 648 WMCloseConnection(WMConnection *cPtr)
 649 {
 650     if (cPtr->sock>=0) {
 651         shutdown(cPtr->sock, SHUT_RDWR);
 652         close(cPtr->sock);
 653         cPtr->sock = -1;
 654     }
 655
 656     removeAllHandlers(cPtr);
 657     clearOutputQueue(cPtr);
 658
 659     cPtr->state = WCClosed;
 660 }
 661
 662
 663 WMConnection*
 664 WMAcceptConnection(WMConnection *listener)
 665 {
 666     struct sockaddr_in clientname;
 667     int size;
 668     int newSock;
 669     WMConnection *newConnection;
 670
 671     WCErrorCode = 0;
 672     wassertrv(listener && listener->state==WCListening, NULL);
 673
 674     size = sizeof(clientname);
 675     newSock = accept(listener->sock, (struct sockaddr*) &clientname, &size);
 676     if (newSock<0) {
 677         WCErrorCode = ((errno!=EAGAIN && errno!=EWOULDBLOCK) ? errno : 0);
 678         return NULL;
 679     }
 680
 681     newConnection = createConnectionWithSocket(newSock, True);
 682     WMSetConnectionNonBlocking(newConnection, True);
 683     newConnection->state = WCConnected;
 684     setConnectionAddress(newConnection, &clientname);
 685
 686     return newConnection;
 687 }
 688
 689
 690 char*
 691 WMGetConnectionAddress(WMConnection *cPtr)
 692 {
 693     return cPtr->address;
 694 }
 695
 696
 697 char*
 698 WMGetConnectionService(WMConnection *cPtr)
 699 {
 700     return cPtr->service;
 701 }
 702
 703
 704 char*
 705 WMGetConnectionProtocol(WMConnection *cPtr)
 706 {
 707     return cPtr->protocol;
 708 }
 709
 710
 711 int
 712 WMGetConnectionSocket(WMConnection *cPtr)
 713 {
 714     return cPtr->sock;
 715 }
 716
 717
 718 WMConnectionState
 719 WMGetConnectionState(WMConnection *cPtr)
 720 {
 721     return cPtr->state;
 722 }
 723
 724
 725 WMConnectionTimeoutState
 726 WMGetConnectionTimeoutState(WMConnection *cPtr)
 727 {
 728     return cPtr->timeoutState;
 729 }
 730
 731
 732 Bool
 733 WMEnqueueConnectionData(WMConnection *cPtr, WMData *data)
 734 {
 735     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, False);
 736     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, False);
 737
 738     if (cPtr->state!=WCConnected)
 739         return False;
 740
 741     WMAddToArray(cPtr->outputQueue, WMRetainData(data));
 742     return True;
 743 }
 744
 745
 746 int
 747 WMSendConnectionData(WMConnection *cPtr, WMData *data)
 748 {
 749     int bytes, pos, len, totalTransfer;
 750     TimeoutData *tPtr = &cPtr->sendTimeout;
 751     const unsigned char *dataBytes;
 752
 753     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, -1);
 754     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, -1);
 755
 756     if (cPtr->state!=WCConnected)
 757         return -1;
 758
 759     /* If we have no data just flush the queue, else try to send data */
 760     if (data && WMGetDataLength(data)>0) {
 761         WMAddToArray(cPtr->outputQueue, WMRetainData(data));
 762         /* If there already was something in queue, and also a write input
 763          * handler is established, it means we were unable to send, so
 764          * return and let the write handler notify us when we can send.
 765          */
 766         if (WMGetArrayItemCount(cPtr->outputQueue)>1 && cPtr->handler.write)
 767             return 0;
 768     }
 769
 770     totalTransfer = 0;
 771
 772     while (WMGetArrayItemCount(cPtr->outputQueue) > 0) {
 773         data = WMGetFromArray(cPtr->outputQueue, 0);
 774         dataBytes = (const unsigned char *)WMDataBytes(data);
 775         len = WMGetDataLength(data);
 776         pos = cPtr->bufPos; /* where we're left last time */
 777         while(pos < len) {
 778         again:
 779             bytes = write(cPtr->sock, dataBytes+pos, len - pos);
 780             if(bytes<0) {
 781                 switch (errno) {
 782                 case EINTR:
 783                     goto again;
 784                 case EWOULDBLOCK:
 785                     /* save the position where we're left and add a timeout */
 786                     cPtr->bufPos = pos;
 787                     if (!tPtr->handler) {
 788                         tPtr->handler = WMAddTimerHandler(tPtr->timeout*1000,
 789                                                           sendTimeout, cPtr);
 790                     }
 791                     if (!cPtr->handler.write) {
 792                         cPtr->handler.write =
 793                             WMAddInputHandler(cPtr->sock, WIWriteMask,
 794                                               inputHandler, cPtr);
 795                     }
 796                     return totalTransfer;
 797                 default:
 798                     WCErrorCode = errno;
 799                     cPtr->state = WCDied;
 800                     removeAllHandlers(cPtr);
 801                     if (cPtr->delegate && cPtr->delegate->didDie)
 802                         (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 803                     return -1;
 804                 }
 805             }
 806             pos += bytes;
 807             totalTransfer += bytes;
 808         }
 809         WMDeleteFromArray(cPtr->outputQueue, 0);
 810         cPtr->bufPos = 0;
 811         if (tPtr->handler) {
 812             WMDeleteTimerHandler(tPtr->handler);
 813             tPtr->handler = NULL;
 814         }
 815         if (cPtr->handler.write) {
 816             WMDeleteInputHandler(cPtr->handler.write);
 817             cPtr->handler.write = NULL;
 818         }
 819     }
 820
 821     return totalTransfer;
 822 }
 823
 824
 825 /*
 826  * WMGetConnectionAvailableData(connection):
 827  *
 828  * will return a WMData structure containing the available data on the
 829  * specified connection. If connection is non-blocking (default) and no data
 830  * is available when this function is called, an empty WMData is returned.
 831  *
 832  * If an error occurs while reading or the other side closed connection,
 833  * it will return NULL.
 834  * Also trying to read from an already died or closed connection is
 835  * considered to be an error condition, and will return NULL.
 836  */
 837 WMData*
 838 WMGetConnectionAvailableData(WMConnection *cPtr)
 839 {
 840     char buffer[NETBUF_SIZE];
 841     int nbytes;
 842     WMData *aData;
 843
 844     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, NULL);
 845     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, NULL);
 846
 847     if (cPtr->state!=WCConnected)
 848         return NULL;
 849
 850     aData = NULL;
 851
 852 again:
 853     nbytes = read(cPtr->sock, buffer, NETBUF_SIZE);
 854     if (nbytes<0) {
 855         switch (errno) {
 856         case EINTR:
 857             goto again;
 858         case EWOULDBLOCK:
 859             aData = WMCreateDataWithCapacity(0);
 860             break;
 861         default:
 862             WCErrorCode = errno;
 863             cPtr->state = WCDied;
 864             removeAllHandlers(cPtr);
 865             if (cPtr->delegate && cPtr->delegate->didDie)
 866                 (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 867             break;
 868         }
 869     } else if (nbytes==0) {      /* the other side has closed connection */
 870         cPtr->state = WCClosed;
 871         removeAllHandlers(cPtr);
 872         if (cPtr->delegate && cPtr->delegate->didDie)
 873             (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 874     } else {
 875         aData = WMCreateDataWithBytes(buffer, nbytes);
 876     }
 877
 878     return aData;
 879 }
 880
 881
 882 void
 883 WMSetConnectionDelegate(WMConnection *cPtr, ConnectionDelegate *delegate)
 884 {
 885     wassertr(cPtr->sock >= 0);
 886     /* Don't try to set the delegate multiple times */
 887     wassertr(cPtr->delegate == NULL);
 888
 889     cPtr->delegate = delegate;
 890     if (delegate && delegate->didReceiveInput && !cPtr->handler.read)
 891         cPtr->handler.read = WMAddInputHandler(cPtr->sock, WIReadMask,
 892                                                inputHandler, cPtr);
 893     if (delegate && delegate->didCatchException && !cPtr->handler.exception)
 894         cPtr->handler.exception = WMAddInputHandler(cPtr->sock, WIExceptMask,
 895                                                     inputHandler, cPtr);
 896 }
 897
 898
 899 #if 0
 900 Bool
 901 WMIsConnectionNonBlocking(WMConnection *cPtr)
 902 {
 903 #if 1
 904     int state;
 905
 906     state = fcntl(cPtr->sock, F_GETFL, 0);
 907
 908     if (state < 0) {
 909         /* If we can't use fcntl on socket, this probably also means we could
 910          * not use fcntl to set non-blocking mode, and since a socket defaults
 911          * to blocking when created, return False as the best assumption */
 912         return False;
 913     }
 914
 915     return ((state & NONBLOCK_OPT)!=0);
 916 #else
 917     return cPtr->isNonBlocking;
 918 #endif
 919 }
 920 #endif
 921
 922
 923 Bool
 924 WMSetConnectionNonBlocking(WMConnection *cPtr, Bool flag)
 925 {
 926     wassertrv(cPtr!=NULL && cPtr->sock>=0, False);
 927
 928     if (cPtr->isNonBlocking == flag)
 929         return True;
 930
 931     if (setSocketNonBlocking(cPtr->sock, flag)==True) {
 932         cPtr->isNonBlocking = flag;
 933         return True;
 934     }
 935
 936     return False;
 937 }
 938
 939
 940 Bool
 941 WMSetConnectionCloseOnExec(WMConnection *cPtr, Bool flag)
 942 {
 943     wassertrv(cPtr!=NULL && cPtr->sock>=0, False);
 944
 945     if (fcntl(cPtr->sock, F_SETFD, (flag ? FD_CLOEXEC : 0)) < 0) {
 946         return False;
 947     }
 948
 949     return True;
 950 }
 951
 952
 953 void*
 954 WMGetConnectionClientData(WMConnection *cPtr)
 955 {
 956     return cPtr->clientData;
 957 }
 958
 959
 960 void
 961 WMSetConnectionClientData(WMConnection *cPtr, void *data)
 962 {
 963     cPtr->clientData = data;
 964 }
 965
 966
 967 unsigned int
 968 WMGetConnectionFlags(WMConnection *cPtr)
 969 {
 970     return cPtr->uflags;
 971 }
 972
 973
 974 void
 975 WMSetConnectionFlags(WMConnection *cPtr, unsigned int flags)
 976 {
 977     cPtr->uflags = flags;
 978 }
 979
 980
 981 WMArray*
 982 WMGetConnectionUnsentData(WMConnection *cPtr)
 983 {
 984     return cPtr->outputQueue;
 985 }
 986
 987
 988 void
 989 WMSetConnectionDefaultTimeout(unsigned int timeout)
 990 {
 991     if (timeout == 0) {
 992         DefaultTimeout = DEF_TIMEOUT;
 993     } else {
 994         DefaultTimeout = timeout;
 995     }
 996 }
 997
 998
 999 void
1000 WMSetConnectionOpenTimeout(unsigned int timeout)
1001 {
1002     if (timeout == 0) {
1003         OpenTimeout = DefaultTimeout;
1004     } else {
1005         OpenTimeout = timeout;
1006     }
1007 }
1008
1009
1010 void
1011 WMSetConnectionSendTimeout(WMConnection *cPtr, unsigned int timeout)
1012 {
1013     if (timeout == 0) {
1014         cPtr->sendTimeout.timeout = DefaultTimeout;
1015     } else {
1016         cPtr->sendTimeout.timeout = timeout;
1017     }
1018 }
1019
1020