/*
 * Copyright (c) 2003 Ben Harris
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
/*
 * mtcpnet.c - MacTCP interface
 */

#include <MacTypes.h>
#include <Devices.h>
#include <Endian.h>
#include <Folders.h>
#include <MacTCP.h>
#include <MixedMode.h>
#include <Resources.h>

#include <assert.h>

#include "putty.h"
#include "network.h"
#include "mac.h"

/*
 * The following structures are documented as being in
 * <AddressXlation.h>, but that isn't shipped with Universal
 * Interfaces, and it's easier to define them here than to require
 * people to download yet another SDK.
 */

static OSErr OpenResolver(char *);
static OSErr CloseResolver(void);

enum {
    OPENRESOLVER = 1,
    CLOSERESOLVER,
    STRTOADDR,
    ADDRTOSTR,
    ENUMCACHE,
    ADDRTONAME,
    HXINFO,
    MXINFO
};

#define NUM_ALT_ADDRS 4

typedef struct hostInfo {
    int rtnCode;
    char cname[255];
    unsigned long addr[NUM_ALT_ADDRS];
};

typedef CALLBACK_API(void, ResultProcPtr)(struct hostInfo *, char *);
typedef STACK_UPP_TYPE(ResultProcPtr) ResultUPP;
enum { uppResultProcInfo = kPascalStackBased
       | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(struct hostInfo*)))
       | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
};
#define NewResultUPP(userRoutine)					\
    (ResultUPP)NewRoutineDescriptor((ProcPtr)(userRoutine),		\
				    uppResultProcInfo,			\
				    GetCurrentArchitecture())
#define DisposeResultUPP(userUPP) DisposeRoutineDescriptor(userUPP)

static OSErr StrToAddr(char *, struct hostInfo *, ResultUPP *, char *);

typedef CALLBACK_API_C(OSErr, OpenResolverProcPtr)(UInt32, char *);
typedef STACK_UPP_TYPE(OpenResolverProcPtr) OpenResolverUPP;
enum { uppOpenResolverProcInfo = kCStackBased
       | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
       | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
       | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char*)))
};
#define InvokeOpenResolverUPP(selector, fileName, userUPP)		\
    CALL_TWO_PARAMETER_UPP((userUPP), uppOpenResolverProcInfo,		\
			   (selector), (fileName))

typedef CALLBACK_API_C(OSErr, CloseResolverProcPtr)(UInt32);
typedef STACK_UPP_TYPE(CloseResolverProcPtr) CloseResolverUPP;
enum { uppCloseResolverProcInfo = kCStackBased
       | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
       | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
};
#define InvokeCloseResolverUPP(selector, userUPP)			\
    CALL_ONE_PARAMETER_UPP((userUPP), uppCloseResolverProcInfo, (selector))

typedef CALLBACK_API_C(OSErr, StrToAddrProcPtr)(UInt32, char *,
						struct hostInfo *, ResultUPP,
						char *);
typedef STACK_UPP_TYPE(StrToAddrProcPtr) StrToAddrUPP;
enum { uppStrToAddrProcInfo = kCStackBased
       | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
       | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(UInt32)))
       | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
       | STACK_ROUTINE_PARAMETER(3, SIZE_CODE(sizeof(struct hostInfo *)))
       | STACK_ROUTINE_PARAMETER(4, SIZE_CODE(sizeof(ResultUPP)))
       | STACK_ROUTINE_PARAMETER(5, SIZE_CODE(sizeof(char *)))
};
#define InvokeStrToAddrUPP(selector, hostName, hostInfoPtr, ResultProc,	\
			   userDataPtr, userUPP)			\
    CALL_FIVE_PARAMETER_UPP((userUPP), uppStrToAddrProcInfo, (selector),\
			    (hostName), (hostInfoPtr), (ResultProc),	\
			    (userDataPtr))
#define StrToAddr(hostName, hostInfoPtr, ResultProc, userDataPtr)	\
    InvokeStrToAddrUPP(STRTOADDR, hostName, hostInfoPtr, ResultProc,	\
		       userDataPtr, (StrToAddrUPP)*mactcp.dnr_handle)

typedef CALLBACK_API_C(OSErr, AddrToStrProcPtr)(UInt32, unsigned long, char *);
typedef STACK_UPP_TYPE(AddrToStrProcPtr) AddrToStrUPP;
enum { uppAddrToStrProcInfo = kCStackBased
       | RESULT_SIZE(SIZE_CODE(sizeof(OSErr)))
       | STACK_ROUTINE_PARAMETER(1, SIZE_CODE(sizeof(unsigned long)))
       | STACK_ROUTINE_PARAMETER(2, SIZE_CODE(sizeof(char *)))
};
#define InvokeAddrToStrUPP(selector, addr, addrStr, userUPP)		\
    CALL_THREE_PARAMETER_UPP((userUPP), uppAddrToStrProcInfo, (selector),\
			     (addr), (addrStr))
#define AddrToStr(addr, addrStr)					\
    InvokeAddrToStrUPP(ADDRTOSTR, addr, addrStr,			\
		       (AddrToStrUPP)*mactcp.dnr_handle)

/* End of AddressXlation.h bits */

struct Socket_tag {
    struct socket_function_table *fn;
    /* the above variable absolutely *must* be the first in this structure */
};

/*
 * We used to typedef struct Socket_tag *Socket.
 *
 * Since we have made the networking abstraction slightly more
 * abstract, Socket no longer means a tcp socket (it could mean
 * an ssl socket).  So now we must use Actual_Socket when we know
 * we are talking about a tcp socket.
 */
typedef struct Socket_tag *Actual_Socket;

struct SockAddr_tag {
    int resolved;
    struct hostInfo hostinfo;
    char hostname[512];
};

/* Global variables */
static struct {
    Handle dnr_handle;
    int initialised;
    short refnum;
} mactcp;

static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie);

/*
 * Initialise MacTCP.
 * This should be called once before any TCP connection is opened.
 */

OSErr mactcp_init(void)
{
    OSErr err;

    /*
     * IM:Devices describes a convoluted way of finding a spare unit
     * number to open a driver on before calling OpenDriver.  Happily,
     * I think the MacTCP INIT ensures that .IPP is already open (and
     * hence has a valid unit number already) so we don't need to go
     * through all that.
     */
    err = OpenDriver("\p.IPP", &mactcp.refnum);
    if (err != noErr) return err;
    err = OpenResolver(NULL);
    if (err != noErr) return err;

    mactcp.initialised = TRUE;
    return noErr;
}

void mactcp_shutdown(void)
{

    CloseResolver();
    mactcp.initialised = FALSE;
}

static ResultUPP mactcp_lookupdone_upp;

SockAddr sk_namelookup(char *host, char **canonicalname)
{
    SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
    OSErr err;
    volatile int done = FALSE;
    char *realhost;

    /* Clear the structure. */
    memset(ret, 0, sizeof(struct SockAddr_tag));
    if (mactcp_lookupdone_upp == NULL)
	mactcp_lookupdone_upp = NewResultUPP(&mactcp_lookupdone);
    err = StrToAddr(host, &ret->hostinfo, mactcp_lookupdone_upp,
		    (char *)&done);
    /*
     * PuTTY expects DNS lookups to be synchronous (see bug
     * "async-dns"), so we pretend they are.
     */
    if (err == cacheFault)
	while (!done)
	    continue;
    ret->resolved = TRUE;
    
    if (ret->hostinfo.rtnCode == noErr)
	realhost = ret->hostinfo.cname;
    else
	realhost = "";
    *canonicalname = smalloc(1+strlen(realhost));
    strcpy(*canonicalname, realhost);
    return ret;
}

static pascal void mactcp_lookupdone(struct hostInfo *hi, char *cookie)
{
    volatile int *donep = (int *)cookie;

    *donep = TRUE;
}

SockAddr sk_nonamelookup(char *host)
{
    SockAddr ret = smalloc(sizeof(struct SockAddr_tag));

    ret->resolved = FALSE;
    ret->hostinfo.rtnCode = noErr;
    ret->hostname[0] = '\0';
    strncat(ret->hostname, host, lenof(ret->hostname) - 1);
    return ret;
}

void sk_getaddr(SockAddr addr, char *buf, int buflen)
{
    char mybuf[16];
    OSErr err;

    /* XXX only return first address */
    err = AddrToStr(addr->hostinfo.addr[0], mybuf);
    buf[0] = '\0';
    if (err != noErr)
	strncat(buf, mybuf, buflen - 1);
}

/* I think "local" here really means "loopback" */

int sk_hostname_is_local(char *name)
{

    return !strcmp(name, "localhost");
}

int sk_address_is_local(SockAddr addr)
{
    int i;

    if (addr->resolved)
	for (i = 0; i < NUM_ALT_ADDRS; i++)
	    if (addr->hostinfo.addr[i] & 0xff000000 == 0x7f000000)
		return TRUE;
    return FALSE;
}

int sk_addrtype(SockAddr addr)
{

    if (addr->resolved)
	return ADDRTYPE_IPV4;
    return ADDRTYPE_NAME;
}

void sk_addrcopy(SockAddr addr, char *buf)
{

    /* XXX only return first address */
    memcpy(buf, &addr->hostinfo.addr[0], 4);
}

void sk_addr_free(SockAddr addr)
{

    sfree(addr);
}

Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
	      int nodelay, Plug plug)
{

    fatalbox("sk_new");
}

/*
 * Special error values are returned from sk_namelookup and sk_new
 * if there's a problem. These functions extract an error message,
 * or return NULL if there's no problem.
 */
char *sk_addr_error(SockAddr addr)
{
    static char buf[64];

    switch (addr->hostinfo.rtnCode) {
      case noErr:
	return NULL;
      case nameSyntaxErr:
	return "Name syntax error";
      case noNameServer:
	return "No name server found";
      case authNameErr:
	return "Domain name does not exist";
      case noAnsErr:
	return "No answer from domain name server";
      case dnrErr:
	return "Domain name server returned an error";
      case outOfMemory:
	return "Out of memory";
      default:
	sprintf(buf, "Unknown DNR error %d", addr->hostinfo.rtnCode);
	return buf;
    }
}


/*
 * Bits below here would usually be in dnr.c, shipped with the MacTCP
 * SDK, but its convenient not to require that, and since we assume
 * System 7 we can actually simplify things a lot.
 */

static OSErr OpenResolver(char *hosts_file)
{
    short vrefnum;
    long dirid;
    HParamBlockRec pb;
    Str255 filename;
    OSErr err;
    int fd;
    Handle dnr_handle;

    if (mactcp.dnr_handle != NULL)
	return noErr;

    err = FindFolder(kOnSystemDisk, kControlPanelFolderType, FALSE, &vrefnum,
		     &dirid);
    if (err != noErr) return err;

    /*
     * Might be better to use PBCatSearch here, but it's not always
     * available.
     */
    pb.fileParam.ioCompletion = NULL;
    pb.fileParam.ioNamePtr = filename;
    pb.fileParam.ioVRefNum = vrefnum;
    pb.fileParam.ioFDirIndex = 1;
    pb.fileParam.ioDirID = dirid;
    fd = -1;

    while (PBHGetFInfo(&pb, FALSE) == noErr) {
	if (pb.fileParam.ioFlFndrInfo.fdType == 'cdev' &&
	    pb.fileParam.ioFlFndrInfo.fdCreator == 'ztcp') {
	    fd = HOpenResFile(vrefnum, dirid, filename, fsRdPerm);
	    if (fd == -1) continue;
	    dnr_handle = Get1IndResource('dnrp', 1);
	    if (dnr_handle != NULL)
		break;
	    CloseResFile(fd);
	    fd = -1;
	}
	pb.fileParam.ioDirID = dirid;
	pb.fileParam.ioFDirIndex++;
    }
    if (fd == -1)
	return fnfErr;
    
    DetachResource(dnr_handle);
    CloseResFile(fd);

    MoveHHi(dnr_handle);
    HLock(dnr_handle);

    err = InvokeOpenResolverUPP(OPENRESOLVER, hosts_file,
				(OpenResolverUPP)*dnr_handle);
    if (err != noErr) {
	HUnlock(dnr_handle);
	DisposeHandle(dnr_handle);
	return err;
    }

    mactcp.dnr_handle = dnr_handle;
    return noErr;
}

OSErr CloseResolver(void)
{
    Handle dnr_handle = mactcp.dnr_handle;
    OSErr err;

    if (mactcp.dnr_handle == NULL)
	return notOpenErr;

    err = InvokeCloseResolverUPP(CLOSERESOLVER,
				 (CloseResolverUPP)*mactcp.dnr_handle);
    if (err != noErr)
	return err;

    mactcp.dnr_handle = NULL;
    HUnlock(dnr_handle);
    DisposeHandle(dnr_handle);
    return noErr;
}

/*
 * Local Variables:
 * c-file-style: "simon"
 * End:
 */