2 * Copyright (c) 2003 Ben Harris
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
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
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
27 * mtcpnet.c - MacTCP interface
35 #include <MixedMode.h>
36 #include <Resources.h>
40 #define DEFINE_PLUG_METHOD_MACROS
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.
52 static OSErr
OpenResolver(char *);
53 static OSErr
CloseResolver(void);
66 #define NUM_ALT_ADDRS 4
68 typedef struct hostInfo
{
71 unsigned long addr
[NUM_ALT_ADDRS
];
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 *)))
80 #define NewResultUPP(userRoutine) \
81 (ResultUPP)NewRoutineDescriptor((ProcPtr)(userRoutine), \
83 GetCurrentArchitecture())
84 #define DisposeResultUPP(userUPP) DisposeRoutineDescriptor(userUPP)
86 static OSErr
StrToAddr(char *, struct hostInfo
*, ResultUPP
*, char *);
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*)))
95 #define InvokeOpenResolverUPP(selector, fileName, userUPP) \
96 CALL_TWO_PARAMETER_UPP((userUPP), uppOpenResolverProcInfo, \
97 (selector), (fileName))
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
)))
105 #define InvokeCloseResolverUPP(selector, userUPP) \
106 CALL_ONE_PARAMETER_UPP((userUPP), uppCloseResolverProcInfo, (selector))
108 typedef CALLBACK_API_C(OSErr
, StrToAddrProcPtr
)(UInt32
, char *,
109 struct hostInfo
*, ResultUPP
,
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 *)))
120 #define InvokeStrToAddrUPP(selector, hostName, hostInfoPtr, ResultProc, \
121 userDataPtr, userUPP) \
122 CALL_FIVE_PARAMETER_UPP((userUPP), uppStrToAddrProcInfo, (selector),\
123 (hostName), (hostInfoPtr), (ResultProc), \
125 #define StrToAddr(hostName, hostInfoPtr, ResultProc, userDataPtr) \
126 InvokeStrToAddrUPP(STRTOADDR, hostName, hostInfoPtr, ResultProc, \
127 userDataPtr, (StrToAddrUPP)*mactcp.dnr_handle)
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 *)))
136 #define InvokeAddrToStrUPP(selector, addr, addrStr, userUPP) \
137 CALL_THREE_PARAMETER_UPP((userUPP), uppAddrToStrProcInfo, (selector),\
139 #define AddrToStr(addr, addrStr) \
140 InvokeAddrToStrUPP(ADDRTOSTR, addr, addrStr, \
141 (AddrToStrUPP)*mactcp.dnr_handle)
143 /* End of AddressXlation.h bits */
146 struct socket_function_table
*fn
;
147 /* the above variable absolutely *must* be the first in this structure */
152 bufchain output_data
;
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 */
161 int oobpending
; /* is there OOB data available to read? */
163 int pending_error
; /* in case send() returns error */
165 struct Socket_tag
*next
;
166 struct Socket_tag
**prev
;
170 * We used to typedef struct Socket_tag *Socket.
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.
177 typedef struct Socket_tag
*Actual_Socket
;
179 struct SockAddr_tag
{
181 struct hostInfo hostinfo
;
185 /* Global variables */
190 ProcessSerialNumber self
;
191 Actual_Socket socklist
;
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 *, int);
201 static int mactcp_write_oob(Socket
, char *, 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);
207 static void mactcp_recv(Actual_Socket s
, size_t len
);
211 * This should be called once before any TCP connection is opened.
214 OSErr
mactcp_init(void)
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)
225 err
= OpenDriver("\p.IPP", &mactcp
.refnum
);
226 if (err
!= noErr
) return err
;
227 err
= OpenResolver(NULL
);
228 if (err
!= noErr
) return err
;
230 mactcp
.initialised
= TRUE
;
234 void mactcp_shutdown(void)
236 Actual_Socket s
, next
;
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.
243 * XXX What about in-flight aync I/O (when we support that)?
245 for (s
= mactcp
.socklist
; s
!= NULL
; s
= next
) {
246 next
= s
->next
; /* s is about to vanish */
247 mactcp_close(&s
->fn
);
251 * When we get async DNS, we have to wait for any outstanding
252 * requests to complete here before exiting.
255 mactcp
.initialised
= FALSE
;
258 static ResultUPP mactcp_lookupdone_upp
;
260 SockAddr
sk_namelookup(char *host
, char **canonicalname
)
262 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
264 volatile int done
= FALSE
;
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
,
274 * PuTTY expects DNS lookups to be synchronous (see bug
275 * "async-dns"), so we pretend they are.
277 if (err
== cacheFault
)
280 ret
->resolved
= TRUE
;
282 if (ret
->hostinfo
.rtnCode
== noErr
)
283 realhost
= ret
->hostinfo
.cname
;
286 *canonicalname
= smalloc(1+strlen(realhost
));
287 strcpy(*canonicalname
, realhost
);
291 static pascal void mactcp_lookupdone(struct hostInfo
*hi
, char *cookie
)
293 volatile int *donep
= (int *)cookie
;
298 SockAddr
sk_nonamelookup(char *host
)
300 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
302 ret
->resolved
= FALSE
;
303 ret
->hostinfo
.rtnCode
= noErr
;
304 ret
->hostname
[0] = '\0';
305 strncat(ret
->hostname
, host
, lenof(ret
->hostname
) - 1);
309 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
314 if (addr
->resolved
) {
315 /* XXX only return first address */
316 err
= AddrToStr(addr
->hostinfo
.addr
[0], mybuf
);
319 strncat(buf
, mybuf
, buflen
- 1);
322 strncat(buf
, addr
->hostname
, buflen
- 1);
326 /* I think "local" here really means "loopback" */
328 int sk_hostname_is_local(char *name
)
331 return !strcmp(name
, "localhost");
334 int sk_address_is_local(SockAddr addr
)
339 for (i
= 0; i
< NUM_ALT_ADDRS
; i
++)
340 if (addr
->hostinfo
.addr
[i
] & 0xff000000 == 0x7f000000)
345 int sk_addrtype(SockAddr addr
)
349 return ADDRTYPE_IPV4
;
350 return ADDRTYPE_NAME
;
353 void sk_addrcopy(SockAddr addr
, char *buf
)
356 /* XXX only return first address */
357 memcpy(buf
, &addr
->hostinfo
.addr
[0], 4);
360 void sk_addr_free(SockAddr addr
)
366 static Plug
mactcp_plug(Socket sock
, Plug p
)
368 Actual_Socket s
= (Actual_Socket
) sock
;
376 static void mactcp_flush(Socket s
)
379 fatalbox("sk_tcp_flush");
382 Socket
sk_register(void *sock
, Plug plug
)
385 fatalbox("sk_register");
388 static TCPNotifyUPP mactcp_asr_upp
;
390 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
391 int nodelay
, Plug plug
)
393 static struct socket_function_table fn_table
= {
399 mactcp_set_private_ptr
,
400 mactcp_get_private_ptr
,
411 * Create Socket structure.
413 ret
= smalloc(sizeof(struct Socket_tag
));
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;
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
;
430 dstaddr
= addr
->hostinfo
.addr
[0]; /* XXX should try all of them */
432 * Create a TCP stream.
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.
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
;
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
;
463 * Open the connection.
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
;
478 ret
->err
= PBControlSync((ParmBlkPtr
)&pb
);
479 if (!privport
|| ret
->err
!= duplicateSocket
)
481 pb
.csParam
.open
.localPort
--;
482 if (pb
.csParam
.open
.localPort
== 0)
486 if (ret
->err
!= noErr
) return (Socket
)ret
;
488 ret
->connected
= TRUE
;
489 ret
->writable
= TRUE
;
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
;
500 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
)
503 fatalbox("sk_newlistener");
506 static void mactcp_close(Socket sock
)
508 Actual_Socket s
= (Actual_Socket
)sock
;
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
517 pb
.ioCRefNum
= mactcp
.refnum
;
518 pb
.csCode
= TCPClose
;
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. */
525 pb
.ioCRefNum
= mactcp
.refnum
;
526 pb
.csCode
= TCPAbort
;
528 pb
.csParam
.abort
.userDataPtr
= (Ptr
)s
;
529 s
->err
= PBControlSync((ParmBlkPtr
)&pb
);
530 /* Even less we can do about an error here. */
532 pb
.ioCRefNum
= mactcp
.refnum
;
533 pb
.csCode
= TCPRelease
;
535 pb
.csParam
.create
.userDataPtr
= (Ptr
)s
;
536 s
->err
= PBControlSync((ParmBlkPtr
)&pb
);
538 sfree(pb
.csParam
.create
.rcvBuff
);
540 /* Unhitch from list of sockets */
543 s
->next
->prev
= s
->prev
;
548 static int mactcp_write(Socket sock
, char *buf
, int len
)
550 Actual_Socket s
= (Actual_Socket
) sock
;
558 pb
.ioCRefNum
= mactcp
.refnum
;
561 pb
.csParam
.send
.validityFlags
= 0;
562 pb
.csParam
.send
.pushFlag
= TRUE
; /* XXX we want it to return. */
563 pb
.csParam
.send
.urgentFlag
= 0;
564 pb
.csParam
.send
.wdsPtr
= (Ptr
)wds
;
565 pb
.csParam
.send
.userDataPtr
= (Ptr
)s
;
566 s
->err
= PBControlSync((ParmBlkPtr
)&pb
);
570 static int mactcp_write_oob(Socket sock
, char *buf
, int len
)
573 fatalbox("mactcp_write_oob");
576 static pascal void mactcp_asr(StreamPtr str
, unsigned short event
, Ptr cookie
,
577 unsigned short termin_reason
,
578 struct ICMPReport
*icmp
)
581 WakeUpProcess(&mactcp
.self
);
585 * Called from our event loop if there's work to do.
587 void mactcp_poll(void)
592 for (s
= mactcp
.socklist
; s
!= NULL
; s
= s
->next
) {
593 /* XXX above can't handle sockets being deleted. */
595 pb
.ioCRefNum
= mactcp
.refnum
;
596 pb
.csCode
= TCPStatus
;
598 pb
.csParam
.status
.userDataPtr
= (Ptr
)s
;
599 s
->err
= PBControlSync((ParmBlkPtr
)&pb
);
602 if (pb
.csParam
.status
.amtUnreadData
== 0)
604 mactcp_recv(s
, pb
.csParam
.status
.amtUnreadData
);
605 /* Should check connectionState in case remote has closed */
612 static void mactcp_recv(Actual_Socket s
, size_t len
)
617 if (s
->frozen
) return;
620 pb
.ioCRefNum
= mactcp
.refnum
;
621 pb
.csCode
= TCPNoCopyRcv
;
623 pb
.csParam
.receive
.commandTimeoutValue
= 0;
624 pb
.csParam
.receive
.rdsPtr
= (Ptr
)rds
;
625 pb
.csParam
.receive
.rdsLength
= lenof(rds
) - 1;
626 pb
.csParam
.receive
.userDataPtr
= (Ptr
)s
;
627 s
->err
= PBControlSync((ParmBlkPtr
)&pb
);
630 plug_receive(s
->plug
, 0, rds
[0].ptr
, rds
[0].length
);
631 len
-= rds
[0].length
;
632 pb
.csCode
= TCPRcvBfrReturn
;
633 s
->err
= PBControlSync((ParmBlkPtr
)&pb
);
640 * Each socket abstraction contains a `void *' private field in
641 * which the client can keep state.
643 static void mactcp_set_private_ptr(Socket sock
, void *ptr
)
645 Actual_Socket s
= (Actual_Socket
) sock
;
646 s
->private_ptr
= ptr
;
649 static void *mactcp_get_private_ptr(Socket sock
)
651 Actual_Socket s
= (Actual_Socket
) sock
;
652 return s
->private_ptr
;
656 * Special error values are returned from sk_namelookup and sk_new
657 * if there's a problem. These functions extract an error message,
658 * or return NULL if there's no problem.
660 char *sk_addr_error(SockAddr addr
)
664 switch (addr
->hostinfo
.rtnCode
) {
668 return "Name syntax error";
670 return "No name server found";
672 return "Domain name does not exist";
674 return "No answer from domain name server";
676 return "Domain name server returned an error";
678 return "Out of memory";
680 sprintf(buf
, "Unknown DNR error %d", addr
->hostinfo
.rtnCode
);
685 static char *mactcp_socket_error(Socket sock
)
688 Actual_Socket s
= (Actual_Socket
) sock
;
693 case insufficientResources
:
694 return "Insufficient resources to open TCP stream";
695 case duplicateSocket
:
696 return "Duplicate socket";
698 return "Connection failed while opening";
700 sprintf(buf
, "Unknown MacTCP error %d", s
->err
);
705 static void mactcp_set_frozen(Socket sock
, int is_frozen
)
707 Actual_Socket s
= (Actual_Socket
) sock
;
709 if (s
->frozen
== is_frozen
)
711 s
->frozen
= is_frozen
;
715 * Bits below here would usually be in dnr.c, shipped with the MacTCP
716 * SDK, but its convenient not to require that, and since we assume
717 * System 7 we can actually simplify things a lot.
720 static OSErr
OpenResolver(char *hosts_file
)
730 if (mactcp
.dnr_handle
!= NULL
)
733 err
= FindFolder(kOnSystemDisk
, kControlPanelFolderType
, FALSE
, &vrefnum
,
735 if (err
!= noErr
) return err
;
738 * Might be better to use PBCatSearch here, but it's not always
741 pb
.fileParam
.ioCompletion
= NULL
;
742 pb
.fileParam
.ioNamePtr
= filename
;
743 pb
.fileParam
.ioVRefNum
= vrefnum
;
744 pb
.fileParam
.ioFDirIndex
= 1;
745 pb
.fileParam
.ioDirID
= dirid
;
748 while (PBHGetFInfoSync(&pb
) == noErr
) {
749 if (pb
.fileParam
.ioFlFndrInfo
.fdType
== 'cdev' &&
750 pb
.fileParam
.ioFlFndrInfo
.fdCreator
== 'ztcp') {
751 fd
= HOpenResFile(vrefnum
, dirid
, filename
, fsRdPerm
);
752 if (fd
== -1) continue;
753 dnr_handle
= Get1IndResource('dnrp', 1);
754 if (dnr_handle
!= NULL
)
759 pb
.fileParam
.ioDirID
= dirid
;
760 pb
.fileParam
.ioFDirIndex
++;
765 DetachResource(dnr_handle
);
771 err
= InvokeOpenResolverUPP(OPENRESOLVER
, hosts_file
,
772 (OpenResolverUPP
)*dnr_handle
);
775 DisposeHandle(dnr_handle
);
779 mactcp
.dnr_handle
= dnr_handle
;
783 OSErr
CloseResolver(void)
785 Handle dnr_handle
= mactcp
.dnr_handle
;
788 if (mactcp
.dnr_handle
== NULL
)
791 err
= InvokeCloseResolverUPP(CLOSERESOLVER
,
792 (CloseResolverUPP
)*mactcp
.dnr_handle
);
796 mactcp
.dnr_handle
= NULL
;
798 DisposeHandle(dnr_handle
);
802 /* MacTCP doesn't have a services database. */
803 int net_service_lookup(char *service
)
812 * c-file-style: "simon"