git.distorted.org.uk Git - u/mdw/putty/blob - mac/mtcpnet.c

   1 /*
   2  * Copyright (c) 2003 Ben Harris
   3  * All rights reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person
   6  * obtaining a copy of this software and associated documentation
   7  * files (the "Software"), to deal in the Software without
   8  * restriction, including without limitation the rights to use,
   9  * copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following
  12  * conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be
  15  * included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  22  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26 /*
  27  * mtcpnet.c - MacTCP interface
  28  */
  29
  30 #include <MacTypes.h>
  31 #include <Devices.h>
  32 #include <Endian.h>
  33 #include <Folders.h>
  34 #include <MacTCP.h>
  35 #include <MixedMode.h>
  36 #include <Resources.h>
  37
  38 #include <assert.h>
  39
  40 #define DEFINE_PLUG_METHOD_MACROS
  41 #include "putty.h"
  42 #include "network.h"
  43 #include "mac.h"
  44
  45 /*
  46  * The following structures are documented as being in
  47  * <AddressXlation.h>, but that isn't shipped with Universal
  48  * Interfaces, and it's easier to define them here than to require
  49  * people to download yet another SDK.
  50  */
  51
  52 static OSErr OpenResolver(char *);
  53 static OSErr CloseResolver(void);
  54
  55 enum {
  56     OPENRESOLVER = 1,
  57     CLOSERESOLVER,
  58     STRTOADDR,
  59     ADDRTOSTR,
  60     ENUMCACHE,
  61     ADDRTONAME,
  62     HXINFO,
  63     MXINFO
  64 };
  65
  66 #define NUM_ALT_ADDRS 4
  67
  68 typedef struct hostInfo {
  69     int rtnCode;
  70     char cname[255];
  71     unsigned long addr[NUM_ALT_ADDRS];
  72 };
  73
  74 typedef CALLBACK_API(void, ResultProcPtr)(struct hostInfo *, char *);
  75 typedef STACK_UPP_TYPE(ResultProcPtr) ResultUPP;
  76 enum { uppResultProcInfo = kPascalStackBased
  77        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(struct hostInfo*)))
  78        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
  79 };
  80 #define NewResultUPP(userRoutine)                                       \
  81     (ResultUPP)NewRoutineDescriptor((ProcPtr)(userRoutine),             \
  82                                     uppResultProcInfo,                  \
  83                                     GetCurrentArchitecture())
  84 #define DisposeResultUPP(userUPP) DisposeRoutineDescriptor(userUPP)
  85
  86 static OSErr StrToAddr(char *, struct hostInfo *, ResultUPP *, char *);
  87
  88 typedef CALLBACK_API_C(OSErr, OpenResolverProcPtr)(UInt32, char *);
  89 typedef STACK_UPP_TYPE(OpenResolverProcPtr) OpenResolverUPP;
  90 enum { uppOpenResolverProcInfo = kCStackBased
  91        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
  92        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
  93        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char*)))
  94 };
  95 #define InvokeOpenResolverUPP(selector, fileName, userUPP)              \
  96     CALL_TWO_PARAMETER_UPP((userUPP), uppOpenResolverProcInfo,          \
  97                            (selector), (fileName))
  98
  99 typedef CALLBACK_API_C(OSErr, CloseResolverProcPtr)(UInt32);
 100 typedef STACK_UPP_TYPE(CloseResolverProcPtr) CloseResolverUPP;
 101 enum { uppCloseResolverProcInfo = kCStackBased
 102        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
 103        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
 104 };
 105 #define InvokeCloseResolverUPP(selector, userUPP)                       \
 106     CALL_ONE_PARAMETER_UPP((userUPP), uppCloseResolverProcInfo, (selector))
 107
 108 typedef CALLBACK_API_C(OSErr, StrToAddrProcPtr)(UInt32, char *,
 109                                                 struct hostInfo *, ResultUPP,
 110                                                 char *);
 111 typedef STACK_UPP_TYPE(StrToAddrProcPtr) StrToAddrUPP;
 112 enum { uppStrToAddrProcInfo = kCStackBased
 113        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
 114        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
 115        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
 116        | STACK_ROUTINE_PARAMETER(3, SIZE_CODE(sizeof(struct hostInfo *)))
 117        | STACK_ROUTINE_PARAMETER(4, SIZE_CODE(sizeof(ResultUPP)))
 118        | STACK_ROUTINE_PARAMETER(5, SIZE_CODE(sizeof(char *)))
 119 };
 120 #define InvokeStrToAddrUPP(selector, hostName, hostInfoPtr, ResultProc, \
 121                            userDataPtr, userUPP)                        \
 122     CALL_FIVE_PARAMETER_UPP((userUPP), uppStrToAddrProcInfo, (selector),\
 123                             (hostName), (hostInfoPtr), (ResultProc),    \
 124                             (userDataPtr))
 125 #define StrToAddr(hostName, hostInfoPtr, ResultProc, userDataPtr)       \
 126     InvokeStrToAddrUPP(STRTOADDR, hostName, hostInfoPtr, ResultProc,    \
 127                        userDataPtr, (StrToAddrUPP)*mactcp.dnr_handle)
 128
 129 typedef CALLBACK_API_C(OSErr, AddrToStrProcPtr)(UInt32, unsigned long, char *);
 130 typedef STACK_UPP_TYPE(AddrToStrProcPtr) AddrToStrUPP;
 131 enum { uppAddrToStrProcInfo = kCStackBased
 132        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
 133        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(unsigned long)))
 134        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
 135 };
 136 #define InvokeAddrToStrUPP(selector, addr, addrStr, userUPP)            \
 137     CALL_THREE_PARAMETER_UPP((userUPP), uppAddrToStrProcInfo, (selector),\
 138                              (addr), (addrStr))
 139 #define AddrToStr(addr, addrStr)                                        \
 140     InvokeAddrToStrUPP(ADDRTOSTR, addr, addrStr,                        \
 141                        (AddrToStrUPP)*mactcp.dnr_handle)
 142
 143 /* End of AddressXlation.h bits */
 144
 145 struct Socket_tag {
 146     struct socket_function_table *fn;
 147     /* the above variable absolutely *must* be the first in this structure */
 148     StreamPtr s;
 149     OSErr err;
 150     Plug plug;
 151     void *private_ptr;
 152     bufchain output_data;
 153     int connected;
 154     int writable;
 155     int frozen; /* this causes readability notifications to be ignored */
 156     int frozen_readable; /* this means we missed at least one readability
 157                           * notification while we were frozen */
 158     int localhost_only;                /* for listening sockets */
 159     char oobdata[1];
 160     int sending_oob;
 161     int oobpending;                    /* is there OOB data available to read? */
 162     int oobinline;
 163     int pending_error;                 /* in case send() returns error */
 164     int listener;
 165     struct Socket_tag *next;
 166     struct Socket_tag **prev;
 167 };
 168
 169 /*
 170  * We used to typedef struct Socket_tag *Socket.
 171  *
 172  * Since we have made the networking abstraction slightly more
 173  * abstract, Socket no longer means a tcp socket (it could mean
 174  * an ssl socket).  So now we must use Actual_Socket when we know
 175  * we are talking about a tcp socket.
 176  */
 177 typedef struct Socket_tag *Actual_Socket;
 178
 179 struct SockAddr_tag {
 180     int resolved;
 181     struct hostInfo hostinfo;
 182     char hostname[512];
 183 };
 184
 185 /* Global variables */
 186 static struct {
 187     Handle dnr_handle;
 188     int initialised;
 189     short refnum;
 190     ProcessSerialNumber self;
 191     Actual_Socket socklist;
 192 } mactcp;
 193
 194 static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie);
 195 static pascal void mactcp_asr(StreamPtr, unsigned short, Ptr, unsigned short,
 196                               struct ICMPReport *);
 197 static Plug mactcp_plug(Socket, Plug);
 198 static void mactcp_flush(Socket);
 199 static void mactcp_close(Socket);
 200 static int mactcp_write(Socket, char const *, int);
 201 static int mactcp_write_oob(Socket, char const*, int);
 202 static void mactcp_set_private_ptr(Socket, void *);
 203 static void *mactcp_get_private_ptr(Socket);
 204 static char *mactcp_socket_error(Socket);
 205 static void mactcp_set_frozen(Socket, int);
 206
 207 static void mactcp_recv(Actual_Socket s, size_t len);
 208
 209 /*
 210  * Initialise MacTCP.
 211  * This should be called once before any TCP connection is opened.
 212  */
 213
 214 OSErr mactcp_init(void)
 215 {
 216     OSErr err;
 217
 218     /*
 219      * IM:Devices describes a convoluted way of finding a spare unit
 220      * number to open a driver on before calling OpenDriver.  Happily,
 221      * the MacTCP INIT ensures that .IPP is already open (and hence
 222      * has a valid unit number already) so we don't need to go through
 223      * all that.  (MacTCP Programmer's Guide p6)
 224      */
 225     err = OpenDriver("\p.IPP", &mactcp.refnum);
 226     if (err != noErr) return err;
 227     err = OpenResolver(NULL);
 228     if (err != noErr) return err;
 229
 230     mactcp.initialised = TRUE;
 231     return noErr;
 232 }
 233
 234 void mactcp_shutdown(void)
 235 {
 236     Actual_Socket s, next;
 237
 238     /*
 239      * Eventually, PuTTY should close down each session as it exits,
 240      * so there should be no sockets left when we get here.  Still,
 241      * better safe than sorry.
 242      *
 243      * XXX What about in-flight aync I/O (when we support that)?
 244      */
 245     for (s = mactcp.socklist; s != NULL; s = next) {
 246         next = s->next; /* s is about to vanish */
 247         mactcp_close(&s->fn);
 248     }
 249
 250     /*
 251      * When we get async DNS, we have to wait for any outstanding
 252      * requests to complete here before exiting.
 253      */
 254     CloseResolver();
 255     mactcp.initialised = FALSE;
 256 }
 257
 258 static ResultUPP mactcp_lookupdone_upp;
 259
 260 SockAddr sk_namelookup(char *host, char **canonicalname)
 261 {
 262     SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
 263     OSErr err;
 264     volatile int done = FALSE;
 265     char *realhost;
 266
 267     /* Clear the structure. */
 268     memset(ret, 0, sizeof(struct SockAddr_tag));
 269     if (mactcp_lookupdone_upp == NULL)
 270         mactcp_lookupdone_upp = NewResultUPP(&mactcp_lookupdone);
 271     err = StrToAddr(host, &ret->hostinfo, mactcp_lookupdone_upp,
 272                     (char *)&done);
 273     /*
 274      * PuTTY expects DNS lookups to be synchronous (see bug
 275      * "async-dns"), so we pretend they are.
 276      */
 277     if (err == cacheFault)
 278         while (!done)
 279             continue;
 280     ret->resolved = TRUE;
 281
 282     if (ret->hostinfo.rtnCode == noErr)
 283         realhost = ret->hostinfo.cname;
 284     else
 285         realhost = "";
 286     *canonicalname = smalloc(1+strlen(realhost));
 287     strcpy(*canonicalname, realhost);
 288     return ret;
 289 }
 290
 291 static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie)
 292 {
 293     volatile int *donep = (int *)cookie;
 294
 295     *donep = TRUE;
 296 }
 297
 298 SockAddr sk_nonamelookup(char *host)
 299 {
 300     SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
 301
 302     ret->resolved = FALSE;
 303     ret->hostinfo.rtnCode = noErr;
 304     ret->hostname[0] = '\0';
 305     strncat(ret->hostname, host, lenof(ret->hostname) - 1);
 306     return ret;
 307 }
 308
 309 void sk_getaddr(SockAddr addr, char *buf, int buflen)
 310 {
 311     char mybuf[16];
 312     OSErr err;
 313
 314     if (addr->resolved) {
 315         /* XXX only return first address */
 316         err = AddrToStr(addr->hostinfo.addr[0], mybuf);
 317         buf[0] = '\0';
 318         if (err != noErr)
 319             strncat(buf, mybuf, buflen - 1);
 320     } else {
 321         buf[0] = '\0';
 322         strncat(buf, addr->hostname, buflen - 1);
 323     }
 324 }
 325
 326 /* I think "local" here really means "loopback" */
 327
 328 int sk_hostname_is_local(char *name)
 329 {
 330
 331     return !strcmp(name, "localhost");
 332 }
 333
 334 int sk_address_is_local(SockAddr addr)
 335 {
 336     int i;
 337
 338     if (addr->resolved)
 339         for (i = 0; i < NUM_ALT_ADDRS; i++)
 340             if (addr->hostinfo.addr[i] & 0xff000000 == 0x7f000000)
 341                 return TRUE;
 342     return FALSE;
 343 }
 344
 345 int sk_addrtype(SockAddr addr)
 346 {
 347
 348     if (addr->resolved)
 349         return ADDRTYPE_IPV4;
 350     return ADDRTYPE_NAME;
 351 }
 352
 353 void sk_addrcopy(SockAddr addr, char *buf)
 354 {
 355
 356     /* XXX only return first address */
 357     memcpy(buf, &addr->hostinfo.addr[0], 4);
 358 }
 359
 360 void sk_addr_free(SockAddr addr)
 361 {
 362
 363     sfree(addr);
 364 }
 365
 366 static Plug mactcp_plug(Socket sock, Plug p)
 367 {
 368     Actual_Socket s = (Actual_Socket) sock;
 369     Plug ret = s->plug;
 370
 371     if (p)
 372         s->plug = p;
 373     return ret;
 374 }
 375
 376 static void mactcp_flush(Socket s)
 377 {
 378
 379     fatalbox("sk_tcp_flush");
 380 }
 381
 382 Socket sk_register(void *sock, Plug plug)
 383 {
 384
 385     fatalbox("sk_register");
 386 }
 387
 388 static TCPNotifyUPP mactcp_asr_upp;
 389
 390 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
 391               int nodelay, Plug plug)
 392 {
 393     static struct socket_function_table fn_table = {
 394         mactcp_plug,
 395         mactcp_close,
 396         mactcp_write,
 397         mactcp_write_oob,
 398         mactcp_flush,
 399         mactcp_set_private_ptr,
 400         mactcp_get_private_ptr,
 401         mactcp_set_frozen,
 402         mactcp_socket_error
 403     };
 404     TCPiopb pb;
 405     UDPiopb upb;
 406     Actual_Socket ret;
 407     ip_addr dstaddr;
 408     size_t buflen;
 409
 410     /*
 411      * Create Socket structure.
 412      */
 413     ret = smalloc(sizeof(struct Socket_tag));
 414     ret->s = 0;
 415     ret->fn = &fn_table;
 416     ret->err = noErr;
 417     ret->plug = plug;
 418     bufchain_init(&ret->output_data);
 419     ret->connected = 0;                /* to start with */
 420     ret->writable = 0;                 /* to start with */
 421     ret->sending_oob = 0;
 422     ret->frozen = 0;
 423     ret->frozen_readable = 0;
 424     ret->localhost_only = 0;           /* unused, but best init anyway */
 425     ret->pending_error = 0;
 426     ret->oobinline = oobinline;
 427     ret->oobpending = FALSE;
 428     ret->listener = 0;
 429
 430     dstaddr = addr->hostinfo.addr[0]; /* XXX should try all of them */
 431     /*
 432      * Create a TCP stream.
 433      *
 434      * MacTCP requires us to provide it with some buffer memory.  Page
 435      * 31 of the Programmer's Guide says it should be a minimum of
 436      * 4*MTU+1024.  Page 36 says a minimum of 4096 bytes.  Assume
 437      * they're both correct.
 438      */
 439     assert(addr->resolved);
 440     upb.ioCRefNum = mactcp.refnum;
 441     upb.csCode = UDPMaxMTUSize;
 442     upb.csParam.mtu.remoteHost = dstaddr;
 443     upb.csParam.mtu.userDataPtr = NULL;
 444     ret->err = PBControlSync((ParmBlkPtr)&upb);
 445     if (ret->err != noErr) return (Socket)ret;
 446
 447     buflen = upb.csParam.mtu.mtuSize * 4 + 1024;
 448     if (buflen < 4096) buflen = 4096;
 449     if (mactcp_asr_upp == NULL)
 450         mactcp_asr_upp = NewTCPNotifyUPP(&mactcp_asr);
 451     GetCurrentProcess(&mactcp.self);
 452     pb.ioCRefNum = mactcp.refnum;
 453     pb.csCode = TCPCreate;
 454     pb.csParam.create.rcvBuff = smalloc(buflen);
 455     pb.csParam.create.rcvBuffLen = buflen;
 456     pb.csParam.create.notifyProc = mactcp_asr_upp;
 457     pb.csParam.create.userDataPtr = (Ptr)ret;
 458     ret->err = PBControlSync((ParmBlkPtr)&pb);
 459     if (ret->err != noErr) return (Socket)ret;
 460     ret->s = pb.tcpStream;
 461
 462     /*
 463      * Open the connection.
 464      */
 465     pb.ioCRefNum = mactcp.refnum;
 466     pb.csCode = TCPActiveOpen;
 467     pb.tcpStream = ret->s;
 468     pb.csParam.open.validityFlags = 0;
 469     pb.csParam.open.remoteHost = dstaddr;
 470     pb.csParam.open.remotePort = port;
 471     pb.csParam.open.localPort = privport ? 1023 : 0;
 472     pb.csParam.open.dontFrag = FALSE;
 473     pb.csParam.open.timeToLive = 0;
 474     pb.csParam.open.security = 0;
 475     pb.csParam.open.optionCnt = 0;
 476     pb.csParam.open.userDataPtr = (Ptr)ret;
 477     while (1) {
 478         ret->err = PBControlSync((ParmBlkPtr)&pb);
 479         if (!privport || ret->err != duplicateSocket)
 480             break;
 481         pb.csParam.open.localPort--;
 482         if (pb.csParam.open.localPort == 0)
 483             break;
 484     }
 485
 486     if (ret->err != noErr) return (Socket)ret;
 487
 488     ret->connected = TRUE;
 489     ret->writable = TRUE;
 490
 491     /* Add this to the list of all sockets */
 492     ret->next = mactcp.socklist;
 493     ret->prev = &mactcp.socklist;
 494     ret->next->prev = &ret->next;
 495     mactcp.socklist = ret;
 496
 497     return (Socket)ret;
 498 }
 499
 500 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
 501 {
 502
 503     fatalbox("sk_newlistener");
 504 }
 505
 506 static void mactcp_close(Socket sock)
 507 {
 508     Actual_Socket s = (Actual_Socket)sock;
 509     TCPiopb pb;
 510
 511     /*
 512      * TCPClose is equivalent to shutdown(fd, SHUT_WR), and hence
 513      * leaves the Rx side open, while TCPAbort seems rather vicious,
 514      * throwing away Tx data that haven't been ACKed yet.  We do both
 515      * in succession.
 516      */
 517     pb.ioCRefNum = mactcp.refnum;
 518     pb.csCode = TCPClose;
 519     pb.tcpStream = s->s;
 520     pb.csParam.close.validityFlags = 0;
 521     pb.csParam.close.userDataPtr = (Ptr)s;
 522     s->err = PBControlSync((ParmBlkPtr)&pb);
 523     /* Not much we can do about an error anyway. */
 524
 525     pb.ioCRefNum = mactcp.refnum;
 526     pb.csCode = TCPAbort;
 527     pb.tcpStream = s->s;
 528     pb.csParam.abort.userDataPtr = (Ptr)s;
 529     s->err = PBControlSync((ParmBlkPtr)&pb);
 530     /* Even less we can do about an error here. */
 531
 532     pb.ioCRefNum = mactcp.refnum;
 533     pb.csCode = TCPRelease;
 534     pb.tcpStream = s->s;
 535     pb.csParam.create.userDataPtr = (Ptr)s;
 536     s->err = PBControlSync((ParmBlkPtr)&pb);
 537     if (s->err == noErr)
 538         sfree(pb.csParam.create.rcvBuff);
 539
 540     /* Unhitch from list of sockets */
 541     *s->prev = s->next;
 542     if (s->next != NULL)
 543         s->next->prev = s->prev;
 544
 545     sfree(s);
 546 }
 547
 548 static int mactcp_write(Socket sock, char const *buf, int len)
 549 {
 550     Actual_Socket s = (Actual_Socket) sock;
 551     wdsEntry wds[2];
 552     TCPiopb pb;
 553
 554     /*
 555      * Casting away const from buf should be safe -- MacTCP won't
 556      * write to it.
 557      */
 558     wds[0].length = len;
 559     wds[0].ptr = (char *)buf;
 560     wds[1].length = 0;
 561
 562     pb.ioCRefNum = mactcp.refnum;
 563     pb.csCode = TCPSend;
 564     pb.tcpStream = s->s;
 565     pb.csParam.send.validityFlags = 0;
 566     pb.csParam.send.pushFlag = TRUE; /* XXX we want it to return. */
 567     pb.csParam.send.urgentFlag = 0;
 568     pb.csParam.send.wdsPtr = (Ptr)wds;
 569     pb.csParam.send.userDataPtr = (Ptr)s;
 570     s->err = PBControlSync((ParmBlkPtr)&pb);
 571     return 0;
 572 }
 573
 574 static int mactcp_write_oob(Socket sock, char const *buf, int len)
 575 {
 576
 577     fatalbox("mactcp_write_oob");
 578 }
 579
 580 static pascal void mactcp_asr(StreamPtr str, unsigned short event, Ptr cookie,
 581                               unsigned short termin_reason,
 582                               struct ICMPReport *icmp)
 583 {
 584
 585     WakeUpProcess(&mactcp.self);
 586 }
 587
 588 /*
 589  * Called from our event loop if there's work to do.
 590  */
 591 void mactcp_poll(void)
 592 {
 593     Actual_Socket s;
 594     TCPiopb pb;
 595
 596     for (s = mactcp.socklist; s != NULL; s = s->next) {
 597         /* XXX above can't handle sockets being deleted. */
 598         do {
 599             pb.ioCRefNum = mactcp.refnum;
 600             pb.csCode = TCPStatus;
 601             pb.tcpStream = s->s;
 602             pb.csParam.status.userDataPtr = (Ptr)s;
 603             s->err = PBControlSync((ParmBlkPtr)&pb);
 604             if (s->err != noErr)
 605                 goto next_socket;
 606             if (pb.csParam.status.amtUnreadData == 0)
 607                 break;
 608             mactcp_recv(s, pb.csParam.status.amtUnreadData);
 609             /* Should check connectionState in case remote has closed */
 610         } while (TRUE);
 611       next_socket:
 612         ;
 613     }
 614 }
 615
 616 static void mactcp_recv(Actual_Socket s, size_t len)
 617 {
 618     rdsEntry rds[2];
 619     TCPiopb pb;
 620
 621     if (s->frozen) return;
 622
 623     while (len > 0) {
 624         pb.ioCRefNum = mactcp.refnum;
 625         pb.csCode = TCPNoCopyRcv;
 626         pb.tcpStream = s->s;
 627         pb.csParam.receive.commandTimeoutValue = 0;
 628         pb.csParam.receive.rdsPtr = (Ptr)rds;
 629         pb.csParam.receive.rdsLength = lenof(rds) - 1;
 630         pb.csParam.receive.userDataPtr = (Ptr)s;
 631         s->err = PBControlSync((ParmBlkPtr)&pb);
 632         if (s->err != noErr)
 633             return;
 634         plug_receive(s->plug, 0, rds[0].ptr, rds[0].length);
 635         len -= rds[0].length;
 636         pb.csCode = TCPRcvBfrReturn;
 637         s->err = PBControlSync((ParmBlkPtr)&pb);
 638         if (s->err != noErr)
 639             return;
 640     }
 641 }
 642
 643 /*
 644  * Each socket abstraction contains a `void *' private field in
 645  * which the client can keep state.
 646  */
 647 static void mactcp_set_private_ptr(Socket sock, void *ptr)
 648 {
 649     Actual_Socket s = (Actual_Socket) sock;
 650     s->private_ptr = ptr;
 651 }
 652
 653 static void *mactcp_get_private_ptr(Socket sock)
 654 {
 655     Actual_Socket s = (Actual_Socket) sock;
 656     return s->private_ptr;
 657 }
 658
 659 /*
 660  * Special error values are returned from sk_namelookup and sk_new
 661  * if there's a problem. These functions extract an error message,
 662  * or return NULL if there's no problem.
 663  */
 664 char *sk_addr_error(SockAddr addr)
 665 {
 666     static char buf[64];
 667
 668     switch (addr->hostinfo.rtnCode) {
 669       case noErr:
 670         return NULL;
 671       case nameSyntaxErr:
 672         return "Name syntax error";
 673       case noNameServer:
 674         return "No name server found";
 675       case authNameErr:
 676         return "Domain name does not exist";
 677       case noAnsErr:
 678         return "No answer from domain name server";
 679       case dnrErr:
 680         return "Domain name server returned an error";
 681       case outOfMemory:
 682         return "Out of memory";
 683       default:
 684         sprintf(buf, "Unknown DNR error %d", addr->hostinfo.rtnCode);
 685         return buf;
 686     }
 687 }
 688
 689 static char *mactcp_socket_error(Socket sock)
 690 {
 691     static char buf[64];
 692     Actual_Socket s = (Actual_Socket) sock;
 693
 694     switch (s->err) {
 695       case noErr:
 696         return NULL;
 697       case insufficientResources:
 698         return "Insufficient resources to open TCP stream";
 699       case duplicateSocket:
 700         return "Duplicate socket";
 701       case openFailed:
 702         return "Connection failed while opening";
 703       default:
 704         sprintf(buf, "Unknown MacTCP error %d", s->err);
 705         return buf;
 706     }
 707 }
 708
 709 static void mactcp_set_frozen(Socket sock, int is_frozen)
 710 {
 711     Actual_Socket s = (Actual_Socket) sock;
 712
 713     if (s->frozen == is_frozen)
 714         return;
 715     s->frozen = is_frozen;
 716 }
 717
 718 /*
 719  * Bits below here would usually be in dnr.c, shipped with the MacTCP
 720  * SDK, but its convenient not to require that, and since we assume
 721  * System 7 we can actually simplify things a lot.
 722  */
 723
 724 static OSErr OpenResolver(char *hosts_file)
 725 {
 726     short vrefnum;
 727     long dirid;
 728     HParamBlockRec pb;
 729     Str255 filename;
 730     OSErr err;
 731     int fd;
 732     Handle dnr_handle;
 733
 734     if (mactcp.dnr_handle != NULL)
 735         return noErr;
 736
 737     err = FindFolder(kOnSystemDisk, kControlPanelFolderType, FALSE, &vrefnum,
 738                      &dirid);
 739     if (err != noErr) return err;
 740
 741     /*
 742      * Might be better to use PBCatSearch here, but it's not always
 743      * available.
 744      */
 745     pb.fileParam.ioCompletion = NULL;
 746     pb.fileParam.ioNamePtr = filename;
 747     pb.fileParam.ioVRefNum = vrefnum;
 748     pb.fileParam.ioFDirIndex = 1;
 749     pb.fileParam.ioDirID = dirid;
 750     fd = -1;
 751
 752     while (PBHGetFInfoSync(&pb) == noErr) {
 753         if (pb.fileParam.ioFlFndrInfo.fdType == 'cdev' &&
 754             pb.fileParam.ioFlFndrInfo.fdCreator == 'ztcp') {
 755             fd = HOpenResFile(vrefnum, dirid, filename, fsRdPerm);
 756             if (fd == -1) continue;
 757             dnr_handle = Get1IndResource('dnrp', 1);
 758             if (dnr_handle != NULL)
 759                 break;
 760             CloseResFile(fd);
 761             fd = -1;
 762         }
 763         pb.fileParam.ioDirID = dirid;
 764         pb.fileParam.ioFDirIndex++;
 765     }
 766     if (fd == -1)
 767         return fnfErr;
 768
 769     DetachResource(dnr_handle);
 770     CloseResFile(fd);
 771
 772     MoveHHi(dnr_handle);
 773     HLock(dnr_handle);
 774
 775     err = InvokeOpenResolverUPP(OPENRESOLVER, hosts_file,
 776                                 (OpenResolverUPP)*dnr_handle);
 777     if (err != noErr) {
 778         HUnlock(dnr_handle);
 779         DisposeHandle(dnr_handle);
 780         return err;
 781     }
 782
 783     mactcp.dnr_handle = dnr_handle;
 784     return noErr;
 785 }
 786
 787 OSErr CloseResolver(void)
 788 {
 789     Handle dnr_handle = mactcp.dnr_handle;
 790     OSErr err;
 791
 792     if (mactcp.dnr_handle == NULL)
 793         return notOpenErr;
 794
 795     err = InvokeCloseResolverUPP(CLOSERESOLVER,
 796                                  (CloseResolverUPP)*mactcp.dnr_handle);
 797     if (err != noErr)
 798         return err;
 799
 800     mactcp.dnr_handle = NULL;
 801     HUnlock(dnr_handle);
 802     DisposeHandle(dnr_handle);
 803     return noErr;
 804 }
 805
 806 /* MacTCP doesn't have a services database. */
 807 int net_service_lookup(char *service)
 808 {
 809
 810     return 0;
 811 }
 812
 813
 814 /*
 815  * Local Variables:
 816  * c-file-style: "simon"
 817  * End:
 818  */