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 #if !TARGET_API_MAC_CARBON
  31
  32 #include <MacTypes.h>
  33 #include <Devices.h>
  34 #include <Endian.h>
  35 #include <Folders.h>
  36 #include <MacTCP.h>
  37 #include <MixedMode.h>
  38 #include <Resources.h>
  39
  40 #include <assert.h>
  41
  42 #define DEFINE_PLUG_METHOD_MACROS
  43 #include "putty.h"
  44 #include "network.h"
  45 #include "mac.h"
  46
  47 /*
  48  * The following structures are documented as being in
  49  * <AddressXlation.h>, but that isn't shipped with Universal
  50  * Interfaces, and it's easier to define them here than to require
  51  * people to download yet another SDK.
  52  */
  53
  54 static OSErr OpenResolver(char *);
  55 static OSErr CloseResolver(void);
  56
  57 enum {
  58     OPENRESOLVER = 1,
  59     CLOSERESOLVER,
  60     STRTOADDR,
  61     ADDRTOSTR,
  62     ENUMCACHE,
  63     ADDRTONAME,
  64     HXINFO,
  65     MXINFO
  66 };
  67
  68 #define NUM_ALT_ADDRS 4
  69
  70 typedef struct hostInfo {
  71     int rtnCode;
  72     char cname[255];
  73     unsigned long addr[NUM_ALT_ADDRS];
  74 };
  75
  76 typedef CALLBACK_API(void, ResultProcPtr)(struct hostInfo *, char *);
  77 typedef STACK_UPP_TYPE(ResultProcPtr) ResultUPP;
  78 enum { uppResultProcInfo = kPascalStackBased
  79        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(struct hostInfo*)))
  80        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
  81 };
  82 #define NewResultUPP(userRoutine)                                       \
  83     (ResultUPP)NewRoutineDescriptor((ProcPtr)(userRoutine),             \
  84                                     uppResultProcInfo,                  \
  85                                     GetCurrentArchitecture())
  86 #define DisposeResultUPP(userUPP) DisposeRoutineDescriptor(userUPP)
  87
  88 static OSErr StrToAddr(char *, struct hostInfo *, ResultUPP *, char *);
  89
  90 typedef CALLBACK_API_C(OSErr, OpenResolverProcPtr)(UInt32, char *);
  91 typedef STACK_UPP_TYPE(OpenResolverProcPtr) OpenResolverUPP;
  92 enum { uppOpenResolverProcInfo = kCStackBased
  93        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
  94        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
  95        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char*)))
  96 };
  97 #define InvokeOpenResolverUPP(selector, fileName, userUPP)              \
  98     CALL_TWO_PARAMETER_UPP((userUPP), uppOpenResolverProcInfo,          \
  99                            (selector), (fileName))
 100
 101 typedef CALLBACK_API_C(OSErr, CloseResolverProcPtr)(UInt32);
 102 typedef STACK_UPP_TYPE(CloseResolverProcPtr) CloseResolverUPP;
 103 enum { uppCloseResolverProcInfo = kCStackBased
 104        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
 105        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
 106 };
 107 #define InvokeCloseResolverUPP(selector, userUPP)                       \
 108     CALL_ONE_PARAMETER_UPP((userUPP), uppCloseResolverProcInfo, (selector))
 109
 110 typedef CALLBACK_API_C(OSErr, StrToAddrProcPtr)(UInt32, char *,
 111                                                 struct hostInfo *, ResultUPP,
 112                                                 char *);
 113 typedef STACK_UPP_TYPE(StrToAddrProcPtr) StrToAddrUPP;
 114 enum { uppStrToAddrProcInfo = kCStackBased
 115        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
 116        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
 117        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
 118        | STACK_ROUTINE_PARAMETER(3, SIZE_CODE(sizeof(struct hostInfo *)))
 119        | STACK_ROUTINE_PARAMETER(4, SIZE_CODE(sizeof(ResultUPP)))
 120        | STACK_ROUTINE_PARAMETER(5, SIZE_CODE(sizeof(char *)))
 121 };
 122 #define InvokeStrToAddrUPP(selector, hostName, hostInfoPtr, ResultProc, \
 123                            userDataPtr, userUPP)                        \
 124     CALL_FIVE_PARAMETER_UPP((userUPP), uppStrToAddrProcInfo, (selector),\
 125                             (hostName), (hostInfoPtr), (ResultProc),    \
 126                             (userDataPtr))
 127 #define StrToAddr(hostName, hostInfoPtr, ResultProc, userDataPtr)       \
 128     InvokeStrToAddrUPP(STRTOADDR, hostName, hostInfoPtr, ResultProc,    \
 129                        userDataPtr, (StrToAddrUPP)*mactcp.dnr_handle)
 130
 131 typedef CALLBACK_API_C(OSErr, AddrToStrProcPtr)(UInt32, unsigned long, char *);
 132 typedef STACK_UPP_TYPE(AddrToStrProcPtr) AddrToStrUPP;
 133 enum { uppAddrToStrProcInfo = kCStackBased
 134        | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
 135        | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
 136        | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(unsigned long)))
 137        | STACK_ROUTINE_PARAMETER(3, SIZE_CODE(sizeof(char *)))
 138 };
 139 #define InvokeAddrToStrUPP(selector, addr, addrStr, userUPP)            \
 140     CALL_THREE_PARAMETER_UPP((userUPP), uppAddrToStrProcInfo, (selector),\
 141                              (addr), (addrStr))
 142 #define AddrToStr(addr, addrStr)                                        \
 143     InvokeAddrToStrUPP(ADDRTOSTR, addr, addrStr,                        \
 144                        (AddrToStrUPP)*mactcp.dnr_handle)
 145
 146 /* End of AddressXlation.h bits */
 147
 148 /* TCP connection states, mysteriously missing from <MacTCP.h> */
 149 #define TCPS_CLOSED             0
 150 #define TCPS_LISTEN             2
 151 #define TCPS_SYN_RECEIVED       4
 152 #define TCPS_SYN_SENT           6
 153 #define TCPS_ESTABLISHED        8
 154 #define TCPS_FIN_WAIT_1         10
 155 #define TCPS_FIN_WAIT_2         12
 156 #define TCPS_CLOSE_WAIT         14
 157 #define TCPS_CLOSING            16
 158 #define TCPS_LAST_ACK           18
 159 #define TCPS_TIME_WAIT          20
 160
 161 struct Socket_tag {
 162     struct socket_function_table *fn;
 163     /* the above variable absolutely *must* be the first in this structure */
 164     StreamPtr s;
 165     OSErr err;
 166     Plug plug;
 167     void *private_ptr;
 168     bufchain output_data;
 169     int connected;
 170     int writable;
 171     int frozen; /* this causes readability notifications to be ignored */
 172     int frozen_readable; /* this means we missed at least one readability
 173                           * notification while we were frozen */
 174     int localhost_only;                /* for listening sockets */
 175     char oobdata[1];
 176     int sending_oob;
 177     int oobpending;                    /* is there OOB data available to read? */
 178     int oobinline;
 179     int pending_error;                 /* in case send() returns error */
 180     int listener;
 181     struct Socket_tag *next;
 182     struct Socket_tag **prev;
 183 };
 184
 185 /*
 186  * We used to typedef struct Socket_tag *Socket.
 187  *
 188  * Since we have made the networking abstraction slightly more
 189  * abstract, Socket no longer means a tcp socket (it could mean
 190  * an ssl socket).  So now we must use Actual_Socket when we know
 191  * we are talking about a tcp socket.
 192  */
 193 typedef struct Socket_tag *Actual_Socket;
 194
 195 struct SockAddr_tag {
 196     int resolved;
 197     struct hostInfo hostinfo;
 198     char hostname[512];
 199 };
 200
 201 /* Global variables */
 202 static struct {
 203     Handle dnr_handle;
 204     int initialised;
 205     short refnum;
 206     ProcessSerialNumber self;
 207     Actual_Socket socklist;
 208 } mactcp;
 209
 210 static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie);
 211 static pascal void mactcp_asr(StreamPtr, unsigned short, Ptr, unsigned short,
 212                               struct ICMPReport *);
 213 static Plug mactcp_plug(Socket, Plug);
 214 static void mactcp_flush(Socket);
 215 static void mactcp_close(Socket);
 216 static int mactcp_write(Socket, char const *, int);
 217 static int mactcp_write_oob(Socket, char const*, int);
 218 static void mactcp_set_private_ptr(Socket, void *);
 219 static void *mactcp_get_private_ptr(Socket);
 220 static const char *mactcp_socket_error(Socket);
 221 static void mactcp_set_frozen(Socket, int);
 222
 223 static void mactcp_recv(Actual_Socket s, size_t len);
 224
 225 /*
 226  * Initialise MacTCP.
 227  * This should be called once before any TCP connection is opened.
 228  */
 229
 230 OSErr mactcp_init(void)
 231 {
 232     OSErr err;
 233
 234     /*
 235      * IM:Devices describes a convoluted way of finding a spare unit
 236      * number to open a driver on before calling OpenDriver.  Happily,
 237      * the MacTCP INIT ensures that .IPP is already open (and hence
 238      * has a valid unit number already) so we don't need to go through
 239      * all that.  (MacTCP Programmer's Guide p6)
 240      */
 241     err = OpenDriver("\p.IPP", &mactcp.refnum);
 242     if (err != noErr) return err;
 243     err = OpenResolver(NULL);
 244     if (err != noErr) return err;
 245
 246     mactcp.initialised = TRUE;
 247     return noErr;
 248 }
 249
 250 void mactcp_cleanup(void)
 251 {
 252     Actual_Socket s, next;
 253
 254     /*
 255      * Eventually, PuTTY should close down each session as it exits,
 256      * so there should be no sockets left when we get here.  Still,
 257      * better safe than sorry.
 258      *
 259      * XXX What about in-flight aync I/O (when we support that)?
 260      */
 261     for (s = mactcp.socklist; s != NULL; s = next) {
 262         next = s->next; /* s is about to vanish */
 263         mactcp_close(&s->fn);
 264     }
 265
 266     /*
 267      * When we get async DNS, we have to wait for any outstanding
 268      * requests to complete here before exiting.
 269      */
 270     CloseResolver();
 271     mactcp.initialised = FALSE;
 272 }
 273
 274 static ResultUPP mactcp_lookupdone_upp;
 275
 276 SockAddr mactcp_namelookup(char const *host, char **canonicalname)
 277 {
 278     SockAddr ret = snew(struct SockAddr_tag);
 279     OSErr err;
 280     volatile int done = FALSE;
 281     char *realhost;
 282     int realhostlen;
 283
 284     /* Clear the structure. */
 285     memset(ret, 0, sizeof(struct SockAddr_tag));
 286     if (mactcp_lookupdone_upp == NULL)
 287         mactcp_lookupdone_upp = NewResultUPP(&mactcp_lookupdone);
 288     /* Casting away const -- hope StrToAddr is sensible */
 289     err = StrToAddr((char *)host, &ret->hostinfo, mactcp_lookupdone_upp,
 290                     (char *)&done);
 291     /*
 292      * PuTTY expects DNS lookups to be synchronous (see bug
 293      * "async-dns"), so we pretend they are.
 294      */
 295     if (err == cacheFault)
 296         while (!done)
 297             continue;
 298     ret->resolved = TRUE;
 299
 300     if (ret->hostinfo.rtnCode == noErr) {
 301         realhost = ret->hostinfo.cname;
 302         /* MacTCP puts trailing dots on canonical names. */
 303         realhostlen = strlen(realhost);
 304         if (realhost[realhostlen - 1] == '.')
 305             realhost[realhostlen - 1] = '\0';
 306     } else
 307         realhost = "";
 308     *canonicalname = snewn(1 + strlen(realhost), char);
 309     strcpy(*canonicalname, realhost);
 310     return ret;
 311 }
 312
 313 static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie)
 314 {
 315     volatile int *donep = (int *)cookie;
 316
 317     *donep = TRUE;
 318 }
 319
 320 SockAddr mactcp_nonamelookup(char const *host)
 321 {
 322     SockAddr ret = snew(struct SockAddr_tag);
 323
 324     ret->resolved = FALSE;
 325     ret->hostinfo.rtnCode = noErr;
 326     ret->hostname[0] = '\0';
 327     strncat(ret->hostname, host, lenof(ret->hostname) - 1);
 328     return ret;
 329 }
 330
 331 void mactcp_getaddr(SockAddr addr, char *buf, int buflen)
 332 {
 333     char mybuf[16];
 334     OSErr err;
 335
 336     if (addr->resolved) {
 337         /* XXX only return first address */
 338         err = AddrToStr(addr->hostinfo.addr[0], mybuf);
 339         buf[0] = '\0';
 340         if (err != noErr)
 341             strncat(buf, mybuf, buflen - 1);
 342     } else {
 343         buf[0] = '\0';
 344         strncat(buf, addr->hostname, buflen - 1);
 345     }
 346 }
 347
 348 /* I think "local" here really means "loopback" */
 349
 350 int mactcp_hostname_is_local(char *name)
 351 {
 352
 353     return !strcmp(name, "localhost");
 354 }
 355
 356 int mactcp_address_is_local(SockAddr addr)
 357 {
 358     int i;
 359
 360     if (addr->resolved)
 361         for (i = 0; i < NUM_ALT_ADDRS; i++)
 362             if (addr->hostinfo.addr[i] & 0xff000000 == 0x7f000000)
 363                 return TRUE;
 364     return FALSE;
 365 }
 366
 367 int mactcp_addrtype(SockAddr addr)
 368 {
 369
 370     if (addr->resolved)
 371         return ADDRTYPE_IPV4;
 372     return ADDRTYPE_NAME;
 373 }
 374
 375 void mactcp_addrcopy(SockAddr addr, char *buf)
 376 {
 377
 378     /* XXX only return first address */
 379     memcpy(buf, &addr->hostinfo.addr[0], 4);
 380 }
 381
 382 void mactcp_addr_free(SockAddr addr)
 383 {
 384
 385     sfree(addr);
 386 }
 387
 388 static Plug mactcp_plug(Socket sock, Plug p)
 389 {
 390     Actual_Socket s = (Actual_Socket) sock;
 391     Plug ret = s->plug;
 392
 393     if (p)
 394         s->plug = p;
 395     return ret;
 396 }
 397
 398 static void mactcp_flush(Socket s)
 399 {
 400
 401     fatalbox("mactcp_flush");
 402 }
 403
 404 Socket mactcp_register(void *sock, Plug plug)
 405 {
 406
 407     fatalbox("mactcp_register");
 408 }
 409
 410 static TCPNotifyUPP mactcp_asr_upp;
 411
 412 Socket mactcp_new(SockAddr addr, int port, int privport, int oobinline,
 413               int nodelay, Plug plug)
 414 {
 415     static struct socket_function_table fn_table = {
 416         mactcp_plug,
 417         mactcp_close,
 418         mactcp_write,
 419         mactcp_write_oob,
 420         mactcp_flush,
 421         mactcp_set_private_ptr,
 422         mactcp_get_private_ptr,
 423         mactcp_set_frozen,
 424         mactcp_socket_error
 425     };
 426     TCPiopb pb;
 427     UDPiopb upb;
 428     Actual_Socket ret;
 429     ip_addr dstaddr;
 430     size_t buflen;
 431
 432     /*
 433      * Create Socket structure.
 434      */
 435     ret = snew(struct Socket_tag);
 436     ret->s = 0;
 437     ret->fn = &fn_table;
 438     ret->err = noErr;
 439     ret->plug = plug;
 440     bufchain_init(&ret->output_data);
 441     ret->connected = 0;                /* to start with */
 442     ret->writable = 0;                 /* to start with */
 443     ret->sending_oob = 0;
 444     ret->frozen = 0;
 445     ret->frozen_readable = 0;
 446     ret->localhost_only = 0;           /* unused, but best init anyway */
 447     ret->pending_error = 0;
 448     ret->oobinline = oobinline;
 449     ret->oobpending = FALSE;
 450     ret->listener = 0;
 451
 452     dstaddr = addr->hostinfo.addr[0]; /* XXX should try all of them */
 453     /*
 454      * Create a TCP stream.
 455      *
 456      * MacTCP requires us to provide it with some buffer memory.  Page
 457      * 31 of the Programmer's Guide says it should be a minimum of
 458      * 4*MTU+1024.  Page 36 says a minimum of 4096 bytes.  Assume
 459      * they're both correct.
 460      */
 461     assert(addr->resolved);
 462     upb.ioCRefNum = mactcp.refnum;
 463     upb.csCode = UDPMaxMTUSize;
 464     upb.csParam.mtu.remoteHost = dstaddr;
 465     upb.csParam.mtu.userDataPtr = NULL;
 466     ret->err = PBControlSync((ParmBlkPtr)&upb);
 467     if (ret->err != noErr) return (Socket)ret;
 468
 469     buflen = upb.csParam.mtu.mtuSize * 4 + 1024;
 470     if (buflen < 4096) buflen = 4096;
 471     if (mactcp_asr_upp == NULL)
 472         mactcp_asr_upp = NewTCPNotifyUPP(&mactcp_asr);
 473     GetCurrentProcess(&mactcp.self);
 474     pb.ioCRefNum = mactcp.refnum;
 475     pb.csCode = TCPCreate;
 476     pb.csParam.create.rcvBuff = snewn(buflen, char);
 477     pb.csParam.create.rcvBuffLen = buflen;
 478     pb.csParam.create.notifyProc = mactcp_asr_upp;
 479     pb.csParam.create.userDataPtr = (Ptr)ret;
 480     ret->err = PBControlSync((ParmBlkPtr)&pb);
 481     if (ret->err != noErr) return (Socket)ret;
 482     ret->s = pb.tcpStream;
 483
 484     /*
 485      * Open the connection.
 486      */
 487     pb.ioCRefNum = mactcp.refnum;
 488     pb.csCode = TCPActiveOpen;
 489     pb.tcpStream = ret->s;
 490     pb.csParam.open.validityFlags = 0;
 491     pb.csParam.open.remoteHost = dstaddr;
 492     pb.csParam.open.remotePort = port;
 493     pb.csParam.open.localPort = privport ? 1023 : 0;
 494     pb.csParam.open.dontFrag = FALSE;
 495     pb.csParam.open.timeToLive = 0;
 496     pb.csParam.open.security = 0;
 497     pb.csParam.open.optionCnt = 0;
 498     pb.csParam.open.userDataPtr = (Ptr)ret;
 499     while (1) {
 500         ret->err = PBControlSync((ParmBlkPtr)&pb);
 501         if (!privport || ret->err != duplicateSocket)
 502             break;
 503         pb.csParam.open.localPort--;
 504         if (pb.csParam.open.localPort == 0)
 505             break;
 506     }
 507
 508     if (ret->err != noErr) return (Socket)ret;
 509
 510     ret->connected = TRUE;
 511     ret->writable = TRUE;
 512
 513     /* Add this to the list of all sockets */
 514     ret->next = mactcp.socklist;
 515     ret->prev = &mactcp.socklist;
 516     if (ret->next != NULL)
 517         ret->next->prev = &ret->next;
 518     mactcp.socklist = ret;
 519
 520     return (Socket)ret;
 521 }
 522
 523 Socket mactcp_newlistener(char *srcaddr, int port, Plug plug,
 524                           int local_host_only)
 525 {
 526
 527     fatalbox("mactcp_newlistener");
 528 }
 529
 530 static void mactcp_close(Socket sock)
 531 {
 532     Actual_Socket s = (Actual_Socket)sock;
 533     TCPiopb pb;
 534
 535     /*
 536      * TCPClose is equivalent to shutdown(fd, SHUT_WR), and hence
 537      * leaves the Rx side open, while TCPAbort seems rather vicious,
 538      * throwing away Tx data that haven't been ACKed yet.  We do both
 539      * in succession.
 540      */
 541     pb.ioCRefNum = mactcp.refnum;
 542     pb.csCode = TCPClose;
 543     pb.tcpStream = s->s;
 544     pb.csParam.close.validityFlags = 0;
 545     pb.csParam.close.userDataPtr = (Ptr)s;
 546     s->err = PBControlSync((ParmBlkPtr)&pb);
 547     /* Not much we can do about an error anyway. */
 548
 549     pb.ioCRefNum = mactcp.refnum;
 550     pb.csCode = TCPAbort;
 551     pb.tcpStream = s->s;
 552     pb.csParam.abort.userDataPtr = (Ptr)s;
 553     s->err = PBControlSync((ParmBlkPtr)&pb);
 554     /* Even less we can do about an error here. */
 555
 556     pb.ioCRefNum = mactcp.refnum;
 557     pb.csCode = TCPRelease;
 558     pb.tcpStream = s->s;
 559     pb.csParam.create.userDataPtr = (Ptr)s;
 560     s->err = PBControlSync((ParmBlkPtr)&pb);
 561     if (s->err == noErr)
 562         sfree(pb.csParam.create.rcvBuff);
 563
 564     /* Unhitch from list of sockets */
 565     *s->prev = s->next;
 566     if (s->next != NULL)
 567         s->next->prev = s->prev;
 568
 569     sfree(s);
 570 }
 571
 572 static int mactcp_write(Socket sock, char const *buf, int len)
 573 {
 574     Actual_Socket s = (Actual_Socket) sock;
 575     wdsEntry wds[2];
 576     TCPiopb pb;
 577
 578     /*
 579      * Casting away const from buf should be safe -- MacTCP won't
 580      * write to it.
 581      */
 582     wds[0].length = len;
 583     wds[0].ptr = (char *)buf;
 584     wds[1].length = 0;
 585
 586     pb.ioCRefNum = mactcp.refnum;
 587     pb.csCode = TCPSend;
 588     pb.tcpStream = s->s;
 589     pb.csParam.send.validityFlags = 0;
 590     pb.csParam.send.pushFlag = TRUE; /* XXX we want it to return. */
 591     pb.csParam.send.urgentFlag = 0;
 592     pb.csParam.send.wdsPtr = (Ptr)wds;
 593     pb.csParam.send.userDataPtr = (Ptr)s;
 594     s->err = PBControlSync((ParmBlkPtr)&pb);
 595     return 0;
 596 }
 597
 598 static int mactcp_write_oob(Socket sock, char const *buf, int len)
 599 {
 600
 601     fatalbox("mactcp_write_oob");
 602 }
 603
 604 static pascal void mactcp_asr(StreamPtr str, unsigned short event, Ptr cookie,
 605                               unsigned short termin_reason,
 606                               struct ICMPReport *icmp)
 607 {
 608
 609     WakeUpProcess(&mactcp.self);
 610 }
 611
 612 /*
 613  * Called from our event loop if there's work to do.
 614  */
 615 void mactcp_poll(void)
 616 {
 617     Actual_Socket s, next;
 618     TCPiopb pb;
 619
 620     for (s = mactcp.socklist; s != NULL; s = next) {
 621         next = s->next;
 622         do {
 623             pb.ioCRefNum = mactcp.refnum;
 624             pb.csCode = TCPStatus;
 625             pb.tcpStream = s->s;
 626             pb.csParam.status.userDataPtr = (Ptr)s;
 627             s->err = PBControlSync((ParmBlkPtr)&pb);
 628             if (s->err != noErr)
 629                 goto next_socket;
 630             if (pb.csParam.status.amtUnreadData == 0)
 631                 break;
 632             mactcp_recv(s, pb.csParam.status.amtUnreadData);
 633         } while (TRUE);
 634         switch (pb.csParam.status.connectionState) {
 635           case TCPS_CLOSE_WAIT:
 636             /* Remote end has sent us a FIN */
 637             plug_closing(s->plug, NULL, 0, 0);
 638         }
 639       next_socket:
 640         ;
 641     }
 642 }
 643
 644 static void mactcp_recv(Actual_Socket s, size_t len)
 645 {
 646     rdsEntry rds[2];
 647     TCPiopb pb;
 648
 649     if (s->frozen) return;
 650
 651     while (len > 0) {
 652         pb.ioCRefNum = mactcp.refnum;
 653         pb.csCode = TCPNoCopyRcv;
 654         pb.tcpStream = s->s;
 655         pb.csParam.receive.commandTimeoutValue = 0;
 656         pb.csParam.receive.rdsPtr = (Ptr)rds;
 657         pb.csParam.receive.rdsLength = lenof(rds) - 1;
 658         pb.csParam.receive.userDataPtr = (Ptr)s;
 659         s->err = PBControlSync((ParmBlkPtr)&pb);
 660         if (s->err != noErr)
 661             return;
 662         plug_receive(s->plug, 0, rds[0].ptr, rds[0].length);
 663         len -= rds[0].length;
 664         pb.csCode = TCPRcvBfrReturn;
 665         s->err = PBControlSync((ParmBlkPtr)&pb);
 666         if (s->err != noErr)
 667             return;
 668     }
 669 }
 670
 671 /*
 672  * Each socket abstraction contains a `void *' private field in
 673  * which the client can keep state.
 674  */
 675 static void mactcp_set_private_ptr(Socket sock, void *ptr)
 676 {
 677     Actual_Socket s = (Actual_Socket) sock;
 678     s->private_ptr = ptr;
 679 }
 680
 681 static void *mactcp_get_private_ptr(Socket sock)
 682 {
 683     Actual_Socket s = (Actual_Socket) sock;
 684     return s->private_ptr;
 685 }
 686
 687 /*
 688  * Special error values are returned from mactcp_namelookup and
 689  * mactcp_new if there's a problem. These functions extract an error
 690  * message, or return NULL if there's no problem.
 691  */
 692 char *mactcp_addr_error(SockAddr addr)
 693 {
 694     static char buf[64];
 695
 696     switch (addr->hostinfo.rtnCode) {
 697       case noErr:
 698         return NULL;
 699       case nameSyntaxErr:
 700         return "Name syntax error";
 701       case noNameServer:
 702         return "No name server found";
 703       case authNameErr:
 704         return "Domain name does not exist";
 705       case noAnsErr:
 706         return "No answer from domain name server";
 707       case dnrErr:
 708         return "Domain name server returned an error";
 709       case outOfMemory:
 710         return "Out of memory";
 711       default:
 712         sprintf(buf, "Unknown DNR error %d", addr->hostinfo.rtnCode);
 713         return buf;
 714     }
 715 }
 716
 717 static const char *mactcp_socket_error(Socket sock)
 718 {
 719     static char buf[64];
 720     Actual_Socket s = (Actual_Socket) sock;
 721
 722     switch (s->err) {
 723       case noErr:
 724         return NULL;
 725       case insufficientResources:
 726         return "Insufficient resources to open TCP stream";
 727       case duplicateSocket:
 728         return "Duplicate socket";
 729       case openFailed:
 730         return "Connection failed while opening";
 731       default:
 732         sprintf(buf, "Unknown MacTCP error %d", s->err);
 733         return buf;
 734     }
 735 }
 736
 737 static void mactcp_set_frozen(Socket sock, int is_frozen)
 738 {
 739     Actual_Socket s = (Actual_Socket) sock;
 740
 741     if (s->frozen == is_frozen)
 742         return;
 743     s->frozen = is_frozen;
 744 }
 745
 746 /*
 747  * Bits below here would usually be in dnr.c, shipped with the MacTCP
 748  * SDK, but its convenient not to require that, and since we assume
 749  * System 7 we can actually simplify things a lot.
 750  */
 751
 752 static OSErr OpenResolver(char *hosts_file)
 753 {
 754     short vrefnum;
 755     long dirid;
 756     HParamBlockRec pb;
 757     Str255 filename;
 758     OSErr err;
 759     int fd;
 760     Handle dnr_handle;
 761
 762     if (mactcp.dnr_handle != NULL)
 763         return noErr;
 764
 765     err = FindFolder(kOnSystemDisk, kControlPanelFolderType, FALSE, &vrefnum,
 766                      &dirid);
 767     if (err != noErr) return err;
 768
 769     /*
 770      * Might be better to use PBCatSearch here, but it's not always
 771      * available.
 772      */
 773     pb.fileParam.ioCompletion = NULL;
 774     pb.fileParam.ioNamePtr = filename;
 775     pb.fileParam.ioVRefNum = vrefnum;
 776     pb.fileParam.ioFDirIndex = 1;
 777     pb.fileParam.ioDirID = dirid;
 778     fd = -1;
 779
 780     while (PBHGetFInfoSync(&pb) == noErr) {
 781         if (pb.fileParam.ioFlFndrInfo.fdType == 'cdev' &&
 782             pb.fileParam.ioFlFndrInfo.fdCreator == 'ztcp') {
 783             fd = HOpenResFile(vrefnum, dirid, filename, fsRdPerm);
 784             if (fd == -1) continue;
 785             dnr_handle = Get1IndResource('dnrp', 1);
 786             if (dnr_handle != NULL)
 787                 break;
 788             CloseResFile(fd);
 789             fd = -1;
 790         }
 791         pb.fileParam.ioDirID = dirid;
 792         pb.fileParam.ioFDirIndex++;
 793     }
 794     if (fd == -1)
 795         return fnfErr;
 796
 797     DetachResource(dnr_handle);
 798     CloseResFile(fd);
 799
 800     MoveHHi(dnr_handle);
 801     HLock(dnr_handle);
 802
 803     err = InvokeOpenResolverUPP(OPENRESOLVER, hosts_file,
 804                                 (OpenResolverUPP)*dnr_handle);
 805     if (err != noErr) {
 806         HUnlock(dnr_handle);
 807         DisposeHandle(dnr_handle);
 808         return err;
 809     }
 810
 811     mactcp.dnr_handle = dnr_handle;
 812     return noErr;
 813 }
 814
 815 OSErr CloseResolver(void)
 816 {
 817     Handle dnr_handle = mactcp.dnr_handle;
 818     OSErr err;
 819
 820     if (mactcp.dnr_handle == NULL)
 821         return notOpenErr;
 822
 823     err = InvokeCloseResolverUPP(CLOSERESOLVER,
 824                                  (CloseResolverUPP)*mactcp.dnr_handle);
 825     if (err != noErr)
 826         return err;
 827
 828     mactcp.dnr_handle = NULL;
 829     HUnlock(dnr_handle);
 830     DisposeHandle(dnr_handle);
 831     return noErr;
 832 }
 833
 834 #endif
 835
 836 /*
 837  * Local Variables:
 838  * c-file-style: "simon"
 839  * End:
 840  */