/*

    File:       ioSock.h

        Contains:   SecureTransport sample I/O module, X sockets version

    Copyright:  © Copyright 2002 Apple Computer, Inc. All rights reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                        ("Apple") in consideration of your agreement to the following terms, and your

                        use, installation, modification or redistribution of this Apple software

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                        please do not use, install, modify or redistribute this Apple software.

                        In consideration of your agreement to abide by the following terms, and subject

                        to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

                        copyrights in this original Apple software (the "Apple Software"), to use,

                        reproduce, modify and redistribute the Apple Software, with or without

                        modifications, in source and/or binary forms; provided that if you redistribute

                        the Apple Software in its entirety and without modifications, you must retain

                        this notice and the following text and disclaimers in all such redistributions of

                        the Apple Software.  Neither the name, trademarks, service marks or logos of

                        Apple Computer, Inc. may be used to endorse or promote products derived from the

                        Apple Software without specific prior written permission from Apple.  Except as

                        expressly stated in this notice, no other rights or licenses, express or implied,

                        are granted by Apple herein, including but not limited to any patent rights that

                        may be infringed by your derivative works or by other works in which the Apple

                        Software may be incorporated.

                        The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                        WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                        WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                        PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                        COMBINATION WITH YOUR PRODUCTS.

                        IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

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                        ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Change History (most recent first):

                11/4/02     1.0d1

*/

#include "ioSock.h"

#include <errno.h>

#include <stdio.h>

#include <unistd.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <netdb.h>

#include <arpa/inet.h>

#include <fcntl.h>

#include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacErrors.h>

#include <time.h>

#include <strings.h>

/* debugging for this module */

#define SSL_OT_DEBUG        1

/* log errors to stdout */

#define SSL_OT_ERRLOG       1

/* trace all low-level network I/O */

#define SSL_OT_IO_TRACE     0

/* if SSL_OT_IO_TRACE, only log non-zero length transfers */

#define SSL_OT_IO_TRACE_NZ  1

/* pause after each I/O (only meaningful if SSL_OT_IO_TRACE == 1) */

#define SSL_OT_IO_PAUSE     0

/* print a stream of dots while I/O pending */

#define SSL_OT_DOT          1

/* dump some bytes of each I/O (only meaningful if SSL_OT_IO_TRACE == 1) */

#define SSL_OT_IO_DUMP      0

#define SSL_OT_IO_DUMP_SIZE 256

/* general, not-too-verbose debugging */

#if     SSL_OT_DEBUG

#define dprintf(s)  printf s

#else   

#define dprintf(s)

#endif

/* errors --> stdout */

#if     SSL_OT_ERRLOG

#define eprintf(s)  printf s

#else   

#define eprintf(s)

#endif

/* enable nonblocking I/O - maybe should be an arg to MakeServerConnection() */

#define NON_BLOCKING    0

/* trace completion of every r/w */

#if     SSL_OT_IO_TRACE

static void tprintf(

    const char *str, 

    UInt32 req, 

    UInt32 act,

    const UInt8 *buf)   

{

    #if SSL_OT_IO_TRACE_NZ

    if(act == 0) {

        return;

    }

    #endif

    printf("%s(%d): moved (%d) bytes\n", str, req, act);

    #if SSL_OT_IO_DUMP

    {

        int i;

        for(i=0; i<act; i++) {

            printf("%02X ", buf[i]);

            if(i >= (SSL_OT_IO_DUMP_SIZE - 1)) {

                break;

            }

        }

        printf("\n");

    }

    #endif

    #if SSL_OT_IO_PAUSE

    {

        char instr[20];

        printf("CR to continue: ");

        gets(instr);

    }

    #endif

}

#else   

#define tprintf(str, req, act, buf)

#endif  /* SSL_OT_IO_TRACE */

/*

 * If SSL_OT_DOT, output a '.' every so often while waiting for

 * connection. This gives user a chance to do something else with the

 * UI.

 */

#if SSL_OT_DOT

static time_t lastTime = (time_t)0;

#define TIME_INTERVAL       3

static void outputDot()

{

    time_t thisTime = time(0);

    if((thisTime - lastTime) >= TIME_INTERVAL) {

        printf("."); fflush(stdout);

        lastTime = thisTime;

    }

}

#else

#define outputDot()

#endif

/*

 * One-time only init.

 */

void initSslOt()

{

}

/*

 * Connect to server. 

 */

OSStatus MakeServerConnection(

    const char *hostName, 

    int port, 

    otSocket *socketNo,     // RETURNED

    PeerSpec *peer)         // RETURNED

{

    struct sockaddr_in  addr;

    struct hostent      *ent;

    struct in_addr      host;

    int                 sock = 0;

    *socketNo = NULL;

    if (hostName[0] >= '0' && hostName[0] <= '9')

    {

        host.s_addr = inet_addr(hostName);

    }

    else

    {   ent = gethostbyname(hostName);

        if (!ent)

        {   printf("gethostbyname failed\n");

            return ioErr;

        }

        memcpy(&host, ent->h_addr, sizeof(struct in_addr));

    }

    sock = socket(AF_INET, SOCK_STREAM, 0);

    addr.sin_addr = host;

    addr.sin_port = htons((u_short)port);

    addr.sin_family = AF_INET;

    if (connect(sock, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)) != 0)

    {   printf("connect returned error\n");

        return ioErr;

    }

    #if     NON_BLOCKING

    /* OK to do this after connect? */

    {

        int rtn = fcntl(sock, F_SETFL, O_NONBLOCK);

        if(rtn == -1) {

            perror("fctnl(O_NONBLOCK)");

            return ioErr;

        }

    }

    #endif  /* NON_BLOCKING*/

    peer->ipAddr = addr.sin_addr.s_addr;

    peer->port = htons((u_short)port);

    *socketNo = (otSocket)sock;

    return noErr;

}

/*

 * Set up an otSocket to listen for client connections. Call once, then

 * use multiple AcceptClientConnection calls. 

 */

OSStatus ListenForClients(

    int port, 

    otSocket *socketNo)     // RETURNED

{  

    struct sockaddr_in  addr;

    struct hostent      *ent;

    int                 len;

    int                 sock;

    sock = socket(AF_INET, SOCK_STREAM, 0);

    if(sock < 1) {

        perror("socket");

        return ioErr;

    }

    ent = gethostbyname("localhost");

    if (!ent) {

        perror("gethostbyname");

        return ioErr;

    }

    memcpy(&addr.sin_addr, ent->h_addr, sizeof(struct in_addr));

    addr.sin_port = htons((u_short)port);

    addr.sin_addr.s_addr = INADDR_ANY;

    addr.sin_family = AF_INET;

    len = sizeof(struct sockaddr_in);

    if (bind(sock, (struct sockaddr *) &addr, len)) {

        perror("bind");

        return ioErr;

    }

    if (listen(sock, 1)) {

        perror("listen");

        return ioErr;

    }

    *socketNo = (otSocket)sock;

    return noErr;

}

/*

 * Accept a client connection.

 */

/*

 * Currently we always get back a different peer port number on successive

 * connections, no matter what the client is doing. To test for resumable 

 * session support, force peer port = 0.

 */

#define FORCE_ACCEPT_PEER_PORT_ZERO     1

OSStatus AcceptClientConnection(

    otSocket listenSock,        // obtained from ListenForClients

    otSocket *acceptSock,       // RETURNED

    PeerSpec *peer)             // RETURNED

{  

    struct sockaddr_in  addr;

    int                 sock;

    int                 len;

    len = sizeof(struct sockaddr_in);

    sock = accept((int)listenSock, (struct sockaddr *) &addr, &len);

    if (sock < 0) {

        perror("accept");

        return ioErr;

    }

    *acceptSock = (otSocket)sock;

    peer->ipAddr = addr.sin_addr.s_addr;

    #if FORCE_ACCEPT_PEER_PORT_ZERO

    peer->port = 0;

    #else

    peer->port = ntohs(addr.sin_port);

    #endif

    return noErr;

}

/*

 * Shut down a connection.

 */

void endpointShutdown(

    otSocket socket)

{

    close((int)socket);

}

/*

 * R/W. Called out from SSL.

 */

OSStatus SocketRead(

    SSLConnectionRef    connection,

    void                *data,          /* owned by 

                                         * caller, data

                                         * RETURNED */

    size_t              *dataLength)    /* IN/OUT */ 

{

    UInt32          bytesToGo = *dataLength;

    UInt32          initLen = bytesToGo;

    UInt8           *currData = (UInt8 *)data;

    int             sock = (int)connection;

    OSStatus        rtn = noErr;

    UInt32          bytesRead;

    int             rrtn;

    *dataLength = 0;

    for(;;) {

        bytesRead = 0;

        rrtn = read(sock, currData, bytesToGo);

        if (rrtn <= 0) {

            /* this is guesswork... */

            int theErr = errno;

            dprintf(("SocketRead: read(%d) error %d\n", (int)bytesToGo, theErr));

            #if !NON_BLOCKING

            if((rrtn == 0) && (theErr == 0)) {

                /* try fix for iSync */ 

                rtn = errSSLClosedGraceful;

                //rtn = errSSLClosedAbort;

            }

            else /* do the switch */

            #endif

            switch(theErr) {

                case ENOENT:

                    /* connection closed */

                    rtn = errSSLClosedGraceful; 

                    break;

                case ECONNRESET:

                    rtn = errSSLClosedAbort;

                    break;

                #if NON_BLOCKING

                case EAGAIN:

                #else

                case 0:     /* ??? */

                #endif

                    rtn = errSSLWouldBlock;

                    break;

                default:

                    dprintf(("SocketRead: read(%d) error %d\n", 

                        (int)bytesToGo, theErr));

                    rtn = ioErr;

                    break;

            }

            break;

        }

        else {

            bytesRead = rrtn;

        }

        bytesToGo -= bytesRead;

        currData  += bytesRead;

        if(bytesToGo == 0) {

            /* filled buffer with incoming data, done */

            break;

        }

    }

    *dataLength = initLen - bytesToGo;

    tprintf("SocketRead", initLen, *dataLength, (UInt8 *)data);

    #if SSL_OT_DOT || (SSL_OT_DEBUG && !SSL_OT_IO_TRACE)

    if((rtn == 0) && (*dataLength == 0)) {

        /* keep UI alive */

        outputDot();

    }

    #endif

    return rtn;

}

int oneAtATime = 0;

OSStatus SocketWrite(

    SSLConnectionRef    connection,

    const void          *data, 

    size_t              *dataLength)    /* IN/OUT */ 

{

    UInt32      bytesSent = 0;

    int         sock = (int)connection;

    int         length;

    UInt32      dataLen = *dataLength;

    const UInt8 *dataPtr = (UInt8 *)data;

    OSStatus    ortn;

    if(oneAtATime && (*dataLength > 1)) {

        UInt32 i;

        UInt32 outLen;

        UInt32 thisMove;

        outLen = 0;

        for(i=0; i<dataLen; i++) {

            thisMove = 1;

            ortn = SocketWrite(connection, dataPtr, &thisMove);

            outLen += thisMove;

            dataPtr++;  

            if(ortn) {

                return ortn;

            }

        }

        return noErr;

    }

    *dataLength = 0;

    do {

        length = write(sock, 

                (char*)dataPtr + bytesSent, 

                dataLen - bytesSent);

    } while ((length > 0) && 

             ( (bytesSent += length) < dataLen) );

    if(length <= 0) {

        if(errno == EAGAIN) {

            ortn = errSSLWouldBlock;

        }

        else {

            ortn = ioErr;

        }

    }

    else {

        ortn = noErr;

    }

    tprintf("SocketWrite", dataLen, bytesSent, dataPtr);

    *dataLength = bytesSent;

    return ortn;

}