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 /* TCP connection states, mysteriously missing from <MacTCP.h> */
 146 #define TCPS_CLOSED             0
 147 #define TCPS_LISTEN             2
 148 #define TCPS_SYN_RECEIVED       4
 149 #define TCPS_SYN_SENT           6
 150 #define TCPS_ESTABLISHED        8
 151 #define TCPS_FIN_WAIT_1         10
 152 #define TCPS_FIN_WAIT_2         12
 153 #define TCPS_CLOSE_WAIT         14
 154 #define TCPS_CLOSING            16
 155 #define TCPS_LAST_ACK           18
 156 #define TCPS_TIME_WAIT          20
 157
 158 struct Socket_tag {
 159     struct socket_function_table *fn;
 160     /* the above variable absolutely *must* be the first in this structure */
 161     StreamPtr s;
 162     OSErr err;
 163     Plug plug;
 164     void *private_ptr;
 165     bufchain output_data;
 166     int connected;
 167     int writable;
 168     int frozen; /* this causes readability notifications to be ignored */
 169     int frozen_readable; /* this means we missed at least one readability
 170                           * notification while we were frozen */
 171     int localhost_only;                /* for listening sockets */
 172     char oobdata[1];
 173     int sending_oob;
 174     int oobpending;                    /* is there OOB data available to read? */
 175     int oobinline;
 176     int pending_error;                 /* in case send() returns error */
 177     int listener;
 178     struct Socket_tag *next;
 179     struct Socket_tag **prev;
 180 };
 181
 182 /*
 183  * We used to typedef struct Socket_tag *Socket.
 184  *
 185  * Since we have made the networking abstraction slightly more
 186  * abstract, Socket no longer means a tcp socket (it could mean
 187  * an ssl socket).  So now we must use Actual_Socket when we know
 188  * we are talking about a tcp socket.
 189  */
 190 typedef struct Socket_tag *Actual_Socket;
 191
 192 struct SockAddr_tag {
 193     int resolved;
 194     struct hostInfo hostinfo;
 195     char hostname[512];
 196 };
 197
 198 /* Global variables */
 199 static struct {
 200     Handle dnr_handle;
 201     int initialised;
 202     short refnum;
 203     ProcessSerialNumber self;
 204     Actual_Socket socklist;
 205 } mactcp;
 206
 207 static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie);
 208 static pascal void mactcp_asr(StreamPtr, unsigned short, Ptr, unsigned short,
 209                               struct ICMPReport *);
 210 static Plug mactcp_plug(Socket, Plug);
 211 static void mactcp_flush(Socket);
 212 static void mactcp_close(Socket);
 213 static int mactcp_write(Socket, char const *, int);
 214 static int mactcp_write_oob(Socket, char const*, int);
 215 static void mactcp_set_private_ptr(Socket, void *);
 216 static void *mactcp_get_private_ptr(Socket);
 217 static char *mactcp_socket_error(Socket);
 218 static void mactcp_set_frozen(Socket, int);
 219
 220 static void mactcp_recv(Actual_Socket s, size_t len);
 221
 222 /*
 223  * Initialise MacTCP.
 224  * This should be called once before any TCP connection is opened.
 225  */
 226
 227 OSErr mactcp_init(void)
 228 {
 229     OSErr err;
 230
 231     /*
 232      * IM:Devices describes a convoluted way of finding a spare unit
 233      * number to open a driver on before calling OpenDriver.  Happily,
 234      * the MacTCP INIT ensures that .IPP is already open (and hence
 235      * has a valid unit number already) so we don't need to go through
 236      * all that.  (MacTCP Programmer's Guide p6)
 237      */
 238     err = OpenDriver("\p.IPP", &mactcp.refnum);
 239     if (err != noErr) return err;
 240     err = OpenResolver(NULL);
 241     if (err != noErr) return err;
 242
 243     mactcp.initialised = TRUE;
 244     return noErr;
 245 }
 246
 247 void mactcp_cleanup(void)
 248 {
 249     Actual_Socket s, next;
 250
 251     /*
 252      * Eventually, PuTTY should close down each session as it exits,
 253      * so there should be no sockets left when we get here.  Still,
 254      * better safe than sorry.
 255      *
 256      * XXX What about in-flight aync I/O (when we support that)?
 257      */
 258     for (s = mactcp.socklist; s != NULL; s = next) {
 259         next = s->next; /* s is about to vanish */
 260         mactcp_close(&s->fn);
 261     }
 262
 263     /*
 264      * When we get async DNS, we have to wait for any outstanding
 265      * requests to complete here before exiting.
 266      */
 267     CloseResolver();
 268     mactcp.initialised = FALSE;
 269 }
 270
 271 static ResultUPP mactcp_lookupdone_upp;
 272
 273 SockAddr mactcp_namelookup(char const *host, char **canonicalname)
 274 {
 275     SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
 276     OSErr err;
 277     volatile int done = FALSE;
 278     char *realhost;
 279     int realhostlen;
 280
 281     /* Clear the structure. */
 282     memset(ret, 0, sizeof(struct SockAddr_tag));
 283     if (mactcp_lookupdone_upp == NULL)
 284         mactcp_lookupdone_upp = NewResultUPP(&mactcp_lookupdone);
 285     /* Casting away const -- hope StrToAddr is sensible */
 286     err = StrToAddr((char *)host, &ret->hostinfo, mactcp_lookupdone_upp,
 287                     (char *)&done);
 288     /*
 289      * PuTTY expects DNS lookups to be synchronous (see bug
 290      * "async-dns"), so we pretend they are.
 291      */
 292     if (err == cacheFault)
 293         while (!done)
 294             continue;
 295     ret->resolved = TRUE;
 296
 297     if (ret->hostinfo.rtnCode == noErr) {
 298         realhost = ret->hostinfo.cname;
 299         /* MacTCP puts trailing dots on canonical names. */
 300         realhostlen = strlen(realhost);
 301         if (realhost[realhostlen - 1] == '.')
 302             realhost[realhostlen - 1] = '\0';
 303     } else
 304         realhost = "";
 305     *canonicalname = smalloc(1+strlen(realhost));
 306     strcpy(*canonicalname, realhost);
 307     return ret;
 308 }
 309
 310 static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie)
 311 {
 312     volatile int *donep = (int *)cookie;
 313
 314     *donep = TRUE;
 315 }
 316
 317 SockAddr mactcp_nonamelookup(char const *host)
 318 {
 319     SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
 320
 321     ret->resolved = FALSE;
 322     ret->hostinfo.rtnCode = noErr;
 323     ret->hostname[0] = '\0';
 324     strncat(ret->hostname, host, lenof(ret->hostname) - 1);
 325     return ret;
 326 }
 327
 328 void mactcp_getaddr(SockAddr addr, char *buf, int buflen)
 329 {
 330     char mybuf[16];
 331     OSErr err;
 332
 333     if (addr->resolved) {
 334         /* XXX only return first address */
 335         err = AddrToStr(addr->hostinfo.addr[0], mybuf);
 336         buf[0] = '\0';
 337         if (err != noErr)
 338             strncat(buf, mybuf, buflen - 1);
 339     } else {
 340         buf[0] = '\0';
 341         strncat(buf, addr->hostname, buflen - 1);
 342     }
 343 }
 344
 345 /* I think "local" here really means "loopback" */
 346
 347 int mactcp_hostname_is_local(char *name)
 348 {
 349
 350     return !strcmp(name, "localhost");
 351 }
 352
 353 int mactcp_address_is_local(SockAddr addr)
 354 {
 355     int i;
 356
 357     if (addr->resolved)
 358         for (i = 0; i < NUM_ALT_ADDRS; i++)
 359             if (addr->hostinfo.addr[i] & 0xff000000 == 0x7f000000)
 360                 return TRUE;
 361     return FALSE;
 362 }
 363
 364 int mactcp_addrtype(SockAddr addr)
 365 {
 366
 367     if (addr->resolved)
 368         return ADDRTYPE_IPV4;
 369     return ADDRTYPE_NAME;
 370 }
 371
 372 void mactcp_addrcopy(SockAddr addr, char *buf)
 373 {
 374
 375     /* XXX only return first address */
 376     memcpy(buf, &addr->hostinfo.addr[0], 4);
 377 }
 378
 379 void mactcp_addr_free(SockAddr addr)
 380 {
 381
 382     sfree(addr);
 383 }
 384
 385 static Plug mactcp_plug(Socket sock, Plug p)
 386 {
 387     Actual_Socket s = (Actual_Socket) sock;
 388     Plug ret = s->plug;
 389
 390     if (p)
 391         s->plug = p;
 392     return ret;
 393 }
 394
 395 static void mactcp_flush(Socket s)
 396 {
 397
 398     fatalbox("mactcp_flush");
 399 }
 400
 401 Socket mactcp_register(void *sock, Plug plug)
 402 {
 403
 404     fatalbox("mactcp_register");
 405 }
 406
 407 static TCPNotifyUPP mactcp_asr_upp;
 408
 409 Socket mactcp_new(SockAddr addr, int port, int privport, int oobinline,
 410               int nodelay, Plug plug)
 411 {
 412     static struct socket_function_table fn_table = {
 413         mactcp_plug,
 414         mactcp_close,
 415         mactcp_write,
 416         mactcp_write_oob,
 417         mactcp_flush,
 418         mactcp_set_private_ptr,
 419         mactcp_get_private_ptr,
 420         mactcp_set_frozen,
 421         mactcp_socket_error
 422     };
 423     TCPiopb pb;
 424     UDPiopb upb;
 425     Actual_Socket ret;
 426     ip_addr dstaddr;
 427     size_t buflen;
 428
 429     /*
 430      * Create Socket structure.
 431      */
 432     ret = smalloc(sizeof(struct Socket_tag));
 433     ret->s = 0;
 434     ret->fn = &fn_table;
 435     ret->err = noErr;
 436     ret->plug = plug;
 437     bufchain_init(&ret->output_data);
 438     ret->connected = 0;                /* to start with */
 439     ret->writable = 0;                 /* to start with */
 440     ret->sending_oob = 0;
 441     ret->frozen = 0;
 442     ret->frozen_readable = 0;
 443     ret->localhost_only = 0;           /* unused, but best init anyway */
 444     ret->pending_error = 0;
 445     ret->oobinline = oobinline;
 446     ret->oobpending = FALSE;
 447     ret->listener = 0;
 448
 449     dstaddr = addr->hostinfo.addr[0]; /* XXX should try all of them */
 450     /*
 451      * Create a TCP stream.
 452      *
 453      * MacTCP requires us to provide it with some buffer memory.  Page
 454      * 31 of the Programmer's Guide says it should be a minimum of
 455      * 4*MTU+1024.  Page 36 says a minimum of 4096 bytes.  Assume
 456      * they're both correct.
 457      */
 458     assert(addr->resolved);
 459     upb.ioCRefNum = mactcp.refnum;
 460     upb.csCode = UDPMaxMTUSize;
 461     upb.csParam.mtu.remoteHost = dstaddr;
 462     upb.csParam.mtu.userDataPtr = NULL;
 463     ret->err = PBControlSync((ParmBlkPtr)&upb);
 464     if (ret->err != noErr) return (Socket)ret;
 465
 466     buflen = upb.csParam.mtu.mtuSize * 4 + 1024;
 467     if (buflen < 4096) buflen = 4096;
 468     if (mactcp_asr_upp == NULL)
 469         mactcp_asr_upp = NewTCPNotifyUPP(&mactcp_asr);
 470     GetCurrentProcess(&mactcp.self);
 471     pb.ioCRefNum = mactcp.refnum;
 472     pb.csCode = TCPCreate;
 473     pb.csParam.create.rcvBuff = smalloc(buflen);
 474     pb.csParam.create.rcvBuffLen = buflen;
 475     pb.csParam.create.notifyProc = mactcp_asr_upp;
 476     pb.csParam.create.userDataPtr = (Ptr)ret;
 477     ret->err = PBControlSync((ParmBlkPtr)&pb);
 478     if (ret->err != noErr) return (Socket)ret;
 479     ret->s = pb.tcpStream;
 480
 481     /*
 482      * Open the connection.
 483      */
 484     pb.ioCRefNum = mactcp.refnum;
 485     pb.csCode = TCPActiveOpen;
 486     pb.tcpStream = ret->s;
 487     pb.csParam.open.validityFlags = 0;
 488     pb.csParam.open.remoteHost = dstaddr;
 489     pb.csParam.open.remotePort = port;
 490     pb.csParam.open.localPort = privport ? 1023 : 0;
 491     pb.csParam.open.dontFrag = FALSE;
 492     pb.csParam.open.timeToLive = 0;
 493     pb.csParam.open.security = 0;
 494     pb.csParam.open.optionCnt = 0;
 495     pb.csParam.open.userDataPtr = (Ptr)ret;
 496     while (1) {
 497         ret->err = PBControlSync((ParmBlkPtr)&pb);
 498         if (!privport || ret->err != duplicateSocket)
 499             break;
 500         pb.csParam.open.localPort--;
 501         if (pb.csParam.open.localPort == 0)
 502             break;
 503     }
 504
 505     if (ret->err != noErr) return (Socket)ret;
 506
 507     ret->connected = TRUE;
 508     ret->writable = TRUE;
 509
 510     /* Add this to the list of all sockets */
 511     ret->next = mactcp.socklist;
 512     ret->prev = &mactcp.socklist;
 513     if (ret->next != NULL)
 514         ret->next->prev = &ret->next;
 515     mactcp.socklist = ret;
 516
 517     return (Socket)ret;
 518 }
 519
 520 Socket mactcp_newlistener(char *srcaddr, int port, Plug plug,
 521                           int local_host_only)
 522 {
 523
 524     fatalbox("mactcp_newlistener");
 525 }
 526
 527 static void mactcp_close(Socket sock)
 528 {
 529     Actual_Socket s = (Actual_Socket)sock;
 530     TCPiopb pb;
 531
 532     /*
 533      * TCPClose is equivalent to shutdown(fd, SHUT_WR), and hence
 534      * leaves the Rx side open, while TCPAbort seems rather vicious,
 535      * throwing away Tx data that haven't been ACKed yet.  We do both
 536      * in succession.
 537      */
 538     pb.ioCRefNum = mactcp.refnum;
 539     pb.csCode = TCPClose;
 540     pb.tcpStream = s->s;
 541     pb.csParam.close.validityFlags = 0;
 542     pb.csParam.close.userDataPtr = (Ptr)s;
 543     s->err = PBControlSync((ParmBlkPtr)&pb);
 544     /* Not much we can do about an error anyway. */
 545
 546     pb.ioCRefNum = mactcp.refnum;
 547     pb.csCode = TCPAbort;
 548     pb.tcpStream = s->s;
 549     pb.csParam.abort.userDataPtr = (Ptr)s;
 550     s->err = PBControlSync((ParmBlkPtr)&pb);
 551     /* Even less we can do about an error here. */
 552
 553     pb.ioCRefNum = mactcp.refnum;
 554     pb.csCode = TCPRelease;
 555     pb.tcpStream = s->s;
 556     pb.csParam.create.userDataPtr = (Ptr)s;
 557     s->err = PBControlSync((ParmBlkPtr)&pb);
 558     if (s->err == noErr)
 559         sfree(pb.csParam.create.rcvBuff);
 560
 561     /* Unhitch from list of sockets */
 562     *s->prev = s->next;
 563     if (s->next != NULL)
 564         s->next->prev = s->prev;
 565
 566     sfree(s);
 567 }
 568
 569 static int mactcp_write(Socket sock, char const *buf, int len)
 570 {
 571     Actual_Socket s = (Actual_Socket) sock;
 572     wdsEntry wds[2];
 573     TCPiopb pb;
 574
 575     /*
 576      * Casting away const from buf should be safe -- MacTCP won't
 577      * write to it.
 578      */
 579     wds[0].length = len;
 580     wds[0].ptr = (char *)buf;
 581     wds[1].length = 0;
 582
 583     pb.ioCRefNum = mactcp.refnum;
 584     pb.csCode = TCPSend;
 585     pb.tcpStream = s->s;
 586     pb.csParam.send.validityFlags = 0;
 587     pb.csParam.send.pushFlag = TRUE; /* XXX we want it to return. */
 588     pb.csParam.send.urgentFlag = 0;
 589     pb.csParam.send.wdsPtr = (Ptr)wds;
 590     pb.csParam.send.userDataPtr = (Ptr)s;
 591     s->err = PBControlSync((ParmBlkPtr)&pb);
 592     return 0;
 593 }
 594
 595 static int mactcp_write_oob(Socket sock, char const *buf, int len)
 596 {
 597
 598     fatalbox("mactcp_write_oob");
 599 }
 600
 601 static pascal void mactcp_asr(StreamPtr str, unsigned short event, Ptr cookie,
 602                               unsigned short termin_reason,
 603                               struct ICMPReport *icmp)
 604 {
 605
 606     WakeUpProcess(&mactcp.self);
 607 }
 608
 609 /*
 610  * Called from our event loop if there's work to do.
 611  */
 612 void mactcp_poll(void)
 613 {
 614     Actual_Socket s, next;
 615     TCPiopb pb;
 616
 617     for (s = mactcp.socklist; s != NULL; s = next) {
 618         next = s->next;
 619         do {
 620             pb.ioCRefNum = mactcp.refnum;
 621             pb.csCode = TCPStatus;
 622             pb.tcpStream = s->s;
 623             pb.csParam.status.userDataPtr = (Ptr)s;
 624             s->err = PBControlSync((ParmBlkPtr)&pb);
 625             if (s->err != noErr)
 626                 goto next_socket;
 627             if (pb.csParam.status.amtUnreadData == 0)
 628                 break;
 629             mactcp_recv(s, pb.csParam.status.amtUnreadData);
 630         } while (TRUE);
 631         switch (pb.csParam.status.connectionState) {
 632           case TCPS_CLOSE_WAIT:
 633             /* Remote end has sent us a FIN */
 634             plug_closing(s->plug, NULL, 0, 0);
 635         }
 636       next_socket:
 637         ;
 638     }
 639 }
 640
 641 static void mactcp_recv(Actual_Socket s, size_t len)
 642 {
 643     rdsEntry rds[2];
 644     TCPiopb pb;
 645
 646     if (s->frozen) return;
 647
 648     while (len > 0) {
 649         pb.ioCRefNum = mactcp.refnum;
 650         pb.csCode = TCPNoCopyRcv;
 651         pb.tcpStream = s->s;
 652         pb.csParam.receive.commandTimeoutValue = 0;
 653         pb.csParam.receive.rdsPtr = (Ptr)rds;
 654         pb.csParam.receive.rdsLength = lenof(rds) - 1;
 655         pb.csParam.receive.userDataPtr = (Ptr)s;
 656         s->err = PBControlSync((ParmBlkPtr)&pb);
 657         if (s->err != noErr)
 658             return;
 659         plug_receive(s->plug, 0, rds[0].ptr, rds[0].length);
 660         len -= rds[0].length;
 661         pb.csCode = TCPRcvBfrReturn;
 662         s->err = PBControlSync((ParmBlkPtr)&pb);
 663         if (s->err != noErr)
 664             return;
 665     }
 666 }
 667
 668 /*
 669  * Each socket abstraction contains a `void *' private field in
 670  * which the client can keep state.
 671  */
 672 static void mactcp_set_private_ptr(Socket sock, void *ptr)
 673 {
 674     Actual_Socket s = (Actual_Socket) sock;
 675     s->private_ptr = ptr;
 676 }
 677
 678 static void *mactcp_get_private_ptr(Socket sock)
 679 {
 680     Actual_Socket s = (Actual_Socket) sock;
 681     return s->private_ptr;
 682 }
 683
 684 /*
 685  * Special error values are returned from mactcp_namelookup and
 686  * mactcp_new if there's a problem. These functions extract an error
 687  * message, or return NULL if there's no problem.
 688  */
 689 char *mactcp_addr_error(SockAddr addr)
 690 {
 691     static char buf[64];
 692
 693     switch (addr->hostinfo.rtnCode) {
 694       case noErr:
 695         return NULL;
 696       case nameSyntaxErr:
 697         return "Name syntax error";
 698       case noNameServer:
 699         return "No name server found";
 700       case authNameErr:
 701         return "Domain name does not exist";
 702       case noAnsErr:
 703         return "No answer from domain name server";
 704       case dnrErr:
 705         return "Domain name server returned an error";
 706       case outOfMemory:
 707         return "Out of memory";
 708       default:
 709         sprintf(buf, "Unknown DNR error %d", addr->hostinfo.rtnCode);
 710         return buf;
 711     }
 712 }
 713
 714 static char *mactcp_socket_error(Socket sock)
 715 {
 716     static char buf[64];
 717     Actual_Socket s = (Actual_Socket) sock;
 718
 719     switch (s->err) {
 720       case noErr:
 721         return NULL;
 722       case insufficientResources:
 723         return "Insufficient resources to open TCP stream";
 724       case duplicateSocket:
 725         return "Duplicate socket";
 726       case openFailed:
 727         return "Connection failed while opening";
 728       default:
 729         sprintf(buf, "Unknown MacTCP error %d", s->err);
 730         return buf;
 731     }
 732 }
 733
 734 static void mactcp_set_frozen(Socket sock, int is_frozen)
 735 {
 736     Actual_Socket s = (Actual_Socket) sock;
 737
 738     if (s->frozen == is_frozen)
 739         return;
 740     s->frozen = is_frozen;
 741 }
 742
 743 /*
 744  * Bits below here would usually be in dnr.c, shipped with the MacTCP
 745  * SDK, but its convenient not to require that, and since we assume
 746  * System 7 we can actually simplify things a lot.
 747  */
 748
 749 static OSErr OpenResolver(char *hosts_file)
 750 {
 751     short vrefnum;
 752     long dirid;
 753     HParamBlockRec pb;
 754     Str255 filename;
 755     OSErr err;
 756     int fd;
 757     Handle dnr_handle;
 758
 759     if (mactcp.dnr_handle != NULL)
 760         return noErr;
 761
 762     err = FindFolder(kOnSystemDisk, kControlPanelFolderType, FALSE, &vrefnum,
 763                      &dirid);
 764     if (err != noErr) return err;
 765
 766     /*
 767      * Might be better to use PBCatSearch here, but it's not always
 768      * available.
 769      */
 770     pb.fileParam.ioCompletion = NULL;
 771     pb.fileParam.ioNamePtr = filename;
 772     pb.fileParam.ioVRefNum = vrefnum;
 773     pb.fileParam.ioFDirIndex = 1;
 774     pb.fileParam.ioDirID = dirid;
 775     fd = -1;
 776
 777     while (PBHGetFInfoSync(&pb) == noErr) {
 778         if (pb.fileParam.ioFlFndrInfo.fdType == 'cdev' &&
 779             pb.fileParam.ioFlFndrInfo.fdCreator == 'ztcp') {
 780             fd = HOpenResFile(vrefnum, dirid, filename, fsRdPerm);
 781             if (fd == -1) continue;
 782             dnr_handle = Get1IndResource('dnrp', 1);
 783             if (dnr_handle != NULL)
 784                 break;
 785             CloseResFile(fd);
 786             fd = -1;
 787         }
 788         pb.fileParam.ioDirID = dirid;
 789         pb.fileParam.ioFDirIndex++;
 790     }
 791     if (fd == -1)
 792         return fnfErr;
 793
 794     DetachResource(dnr_handle);
 795     CloseResFile(fd);
 796
 797     MoveHHi(dnr_handle);
 798     HLock(dnr_handle);
 799
 800     err = InvokeOpenResolverUPP(OPENRESOLVER, hosts_file,
 801                                 (OpenResolverUPP)*dnr_handle);
 802     if (err != noErr) {
 803         HUnlock(dnr_handle);
 804         DisposeHandle(dnr_handle);
 805         return err;
 806     }
 807
 808     mactcp.dnr_handle = dnr_handle;
 809     return noErr;
 810 }
 811
 812 OSErr CloseResolver(void)
 813 {
 814     Handle dnr_handle = mactcp.dnr_handle;
 815     OSErr err;
 816
 817     if (mactcp.dnr_handle == NULL)
 818         return notOpenErr;
 819
 820     err = InvokeCloseResolverUPP(CLOSERESOLVER,
 821                                  (CloseResolverUPP)*mactcp.dnr_handle);
 822     if (err != noErr)
 823         return err;
 824
 825     mactcp.dnr_handle = NULL;
 826     HUnlock(dnr_handle);
 827     DisposeHandle(dnr_handle);
 828     return noErr;
 829 }
 830
 831 /* MacTCP doesn't have a services database. */
 832 int net_service_lookup(char *service)
 833 {
 834
 835     return 0;
 836 }
 837
 838
 839 /*
 840  * Local Variables:
 841  * c-file-style: "simon"
 842  * End:
 843  */