CMEncrypt.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   CMEncrypt - Send Encrypted Payload;
     *
     *   this program sends and receives raw ethernet frames and so needs
     *   root privileges; if you install it using "chmod 555" and "chown
     *   root:root" then you must login as root to run it; otherwise, you
     *   can install it using "chmod 4555" and "chown root:root" so that
     *   anyone can run it; the program will refuse to run until you get
     *   things right;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*"
     *   system header files;
     *--------------------------------------------------------------------*/

    #include <unistd.h>
    #include <stdlib.h>
    #include <stdint.h>
    #include <time.h>

    /*====================================================================*
     *   custom header files;
     *--------------------------------------------------------------------*/

    #include "../tools/getoptv.h"
    #include "../tools/putoptv.h"
    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/symbol.h"
    #include "../tools/types.h"
    #include "../tools/flags.h"
    #include "../tools/files.h"
    #include "../tools/error.h"
    #include "../key/SHA256.h"
    #include "../plc/plc.h"

    /*====================================================================*
     *   custom source files;
     *--------------------------------------------------------------------*/

    #ifndef MAKEFILE
    #include "../tools/getoptv.c"
    #include "../tools/putoptv.c"
    #include "../tools/version.c"
    #include "../tools/uintspec.c"
    #include "../tools/hexencode.c"
    #include "../tools/hexdecode.c"
    #include "../tools/hexdump.c"
    #include "../tools/todigit.c"
    #include "../tools/error.c"
    #include "../tools/synonym.c"
    #endif

    #ifndef MAKEFILE
    #include "../plc/Confirm.c"
    #include "../plc/Failure.c"
    #include "../plc/Request.c"
    #include "../plc/Devices.c"
    #endif

    #ifndef MAKEFILE
    #include "../ether/channel.c"
    #include "../ether/openchannel.c"
    #include "../ether/closechannel.c"
    #include "../ether/readpacket.c"
    #include "../ether/sendpacket.c"
    #endif

    #ifndef MAKEFILE
    #include "../key/SHA256Reset.c"
    #include "../key/SHA256Write.c"
    #include "../key/SHA256Block.c"
    #include "../key/SHA256Fetch.c"
    #endif

    #ifndef MAKEFILE
    #include "../mme/EthernetHeader.c"
    #include "../mme/HomePlugHeader.c"
    #include "../mme/MMECode.c"
    #endif

    /*====================================================================*
     *   program constants;
     *--------------------------------------------------------------------*/

    #define CMENCRYPT_PEKS 0x0F
    #define CMENCRYPT_AVLN 0x00
    #define CMENCRYPT_PID 0x04

    /*====================================================================*
     *
     *   int main (int argc, char const * argv[]);
     *
     *
     *--------------------------------------------------------------------*/

    int main (int argc, char const * argv [])

    {
    	extern struct channel channel;
    	static char const * optv [] =
    	{
    		"A:f:i:K:P:qv",
    		"device [device] [...]",
    		"Send an encrypted payload using CM_ENCRYPTED_PAYLOAD",
    		"A n\tAVLN Status [" LITERAL (CMENCRYPT_AVLN) "]",
    		"K n\tPayload Encryption Key Select (PEKS) [" LITERAL (CMENCRYPT_PEKS) "]",
    		"P n\tProtocol Identifier (PID) [" LITERAL (CMENCRYPT_PID) "]",

    #if defined (WINPCAP) || defined (LIBPCAP)

    		"i n\thost interface is (n) [" LITERAL (CHANNEL_ETHNUMBER) "]",

    #else

    		"i s\thost interface is (s) [" LITERAL (CHANNEL_ETHDEVICE) "]",

    #endif

    		"f f\tpayload file",
    		"q\tquiet mode",
    		"v\tverbose mode",
    		(char const *) (0)
    	};

    #ifndef __GNUC__
    #pragma pack(push,1)
    #endif

    	struct __packed cm_encrypted_payload
    	{
    		uint8_t PEKS;
    		uint8_t AVLN;
    		uint8_t PID;
    		uint16_t PRN;
    		uint8_t PMN;
    		uint8_t UUID [16];
    		uint16_t LEN;
    	}
    	template =
    	{
    		CMENCRYPT_PEKS,
    		CMENCRYPT_AVLN,
    		CMENCRYPT_PID,
    		0x0000,
    		0x00,
    		{
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00
    		},
    		0x0000
    	};

    #ifndef __GNUC__
    #pragma pack (pop)
    #endif

    	struct _file_ file =
    	{
    		-1,
    		(char const *) (0)
    	};
    	struct sha256 sha256;
    	uint8_t digest [SHA256_DIGEST_LENGTH];
    	time_t timer = time ((time_t *)(0));
    	uint8_t packet [ETHER_MAX_LEN];
    	uint8_t * buffer;
    	signed extent;
    	signed c;
    	if (getenv (PLCDEVICE))
    	{

    #if defined (WINPCAP) || defined (LIBPCAP)

    		channel.ifindex = atoi (getenv (PLCDEVICE));

    #else

    		channel.ifname = strdup (getenv (PLCDEVICE));

    #endif

    	}
    	optind = 1;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch (c)
    		{
    		case 'f':
    			if ((file.file = open (file.name = optarg, O_BINARY|O_RDONLY)) == -1)
    			{
    				error (1, errno, "%s", file.name);
    			}
    			break;
    		case 'P':
    			template.PID = (byte)(uintspec (optarg, 0x00, 0x0F));
    			break;
    		case 'A':
    			template.AVLN = (byte)(uintspec (optarg, 0x00, 0x08));
    			break;
    		case 'K':
    			template.PEKS = (byte)(uintspec (optarg, 0x00, 0xFF));
    			break;
    		case 'i':

    #if defined (WINPCAP) || defined (LIBPCAP)

    			channel.ifindex = atoi (optarg);

    #else

    			channel.ifname = optarg;

    #endif

    			break;
    		case 'q':
    			_setbits (channel.flags, CHANNEL_SILENCE);
    			break;
    		case 'v':
    			_setbits (channel.flags, CHANNEL_VERBOSE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;

    /*
     *	load entire file into memory;
     */

    	if (file.file == -1)
    	{
    		error (1, ECANCELED, "No payload file given: Use -f <file>");
    	}
    	if ((extent = lseek (file.file, 0, SEEK_END)) == -1)
    	{
    		error (1, errno, FILE_CANTSIZE, file.name);
    	}
    	if (!(buffer = malloc (extent)))
    	{
    		error (1, errno, FILE_CANTLOAD, file.name);
    	}
    	if (lseek (file.file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, file.name);
    	}
    	if (read (file.file, buffer, extent) != extent)
    	{
    		error (1, errno, FILE_CANTREAD, file.name);
    	}
    	close (file.file);
    	SHA256Reset (&sha256);
    	SHA256Write (&sha256, buffer, extent);
    	SHA256Fetch (&sha256, digest);
    	if (!argc)
    	{
    		error (1, ECANCELED, "No destination given");
    	}
    	openchannel (&channel);
    	while ((argc) && (* argv))
    	{
    		signed offset = 0;
    		signed remain = extent;

    #if 0

    		signed length = sizeof (struct packet_ms) - sizeof (template);

    #else

    		signed length = 502 - sizeof (template);

    #endif

    		if (!hexencode (channel.peer, sizeof (channel.peer), synonym (* argv, devices, SIZEOF (devices))))
    		{
    			error (1, errno, PLC_BAD_MAC, * argv);
    		}
    		template.PRN = (uint16_t)(timer);
    		template.PMN = 0;
    		memcpy (template.UUID, digest, sizeof (template.UUID));
    		while (remain)
    		{
    			uint8_t * memory = packet;
    			if (length > remain)
    			{
    				length = remain;
    			}
    			template.PMN++;
    			template.LEN = HTOLE16 (length);
    			memset (memory, 0, sizeof (struct message));
    			memory += EthernetHeader ((struct ethernet_hdr *)(memory), channel.peer, channel.host, channel.type);
    			memory += HomePlugHeader ((struct homeplug_hdr *)(memory), 0, (CM_ENCRYPTED_PAYLOAD | MMTYPE_IND));
    			memcpy (memory, &template, sizeof (template));
    			memory += sizeof (template);
    			memcpy (memory, buffer + offset, length);
    			memory += length;
    			extent = (signed)(memory - packet);
    			if (extent < (ETHER_MIN_LEN - ETHER_CRC_LEN))
    			{
    				extent = (ETHER_MIN_LEN - ETHER_CRC_LEN);
    			}
    			if (sendpacket (&channel, packet, extent) < extent)
    			{
    				error (1, errno, CHANNEL_CANTSEND);
    			}
    			offset += length;
    			remain -= length;
    		}
    		argc--;
    		argv++;
    	}
    	closechannel (&channel);
    	free (buffer);
    	exit (0);
    }

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