[hmcfgusb] / hmland.c

/* HM-CFG-LAN emulation for HM-CFG-USB
 *
 * Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
 *
 * 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 OR COPYRIGHT HOLDERS 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <poll.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libusb-1.0/libusb.h>

#include "hexdump.h"
#include "hmcfgusb.h"

#define PID_FILE "/var/run/hmland.pid"

extern char *optarg;

static int impersonate_hmlanif = 0;
static int debug = 0;
static int verbose = 0;

#define	FLAG_LENGTH_BYTE	(1<<0)
#define	FLAG_FORMAT_HEX		(1<<1)
#define	FLAG_COMMA_BEFORE	(1<<2)
#define	FLAG_COMMA_AFTER	(1<<3)
#define	FLAG_NL			(1<<4)
#define	FLAG_IGNORE_COMMAS	(1<<5)

#define CHECK_SPACE(x)		if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
#define CHECK_AVAIL(x)		if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }

static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
{
	const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
		'A', 'B', 'C', 'D', 'E', 'F'};
	uint8_t *buf_out = *outpos;
	uint8_t *outend = *outpos + outlen;
	uint8_t *inend = *inpos + inlen;
	int i;

	if (flags & FLAG_COMMA_BEFORE) {
		CHECK_SPACE(1);
		**outpos=',';
		*outpos += 1;
	}

	if (flags & FLAG_LENGTH_BYTE) {
		CHECK_AVAIL(1);
		len = **inpos;
		*inpos += 1;
	}

	if (flags & FLAG_FORMAT_HEX) {
		CHECK_AVAIL(len);
		CHECK_SPACE(len*2);
		for (i = 0; i < len; i++) {
			**outpos = nibble[((**inpos) & 0xf0) >> 4];
			*outpos += 1;
			**outpos = nibble[((**inpos) & 0xf)];
			*inpos += 1; *outpos += 1;
		}
	} else {
		CHECK_AVAIL(len);
		CHECK_SPACE(len);
		memcpy(*outpos, *inpos, len);
		*outpos += len;
		*inpos += len;
	}

	if (flags & FLAG_COMMA_AFTER) {
		CHECK_SPACE(1);
		**outpos=',';
		*outpos += 1;
	}

	if (flags & FLAG_NL) {
		CHECK_SPACE(2);
		**outpos='\r';
		*outpos += 1;
		**outpos='\n';
		*outpos += 1;
	}

	return *outpos - buf_out;
}

static uint8_t ascii_to_nibble(uint8_t a)
{
	uint8_t c = 0x00;

	if ((a >= '0') && (a <= '9')) {
		c = a - '0';
	} else if ((a >= 'A') && (a <= 'F')) {
		c = (a - 'A') + 10;
	} else if ((a >= 'a') && (a <= 'f')) {
		c = (a - 'a') + 10;
	}

	return c;
}

static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
{
	uint8_t *buf_out = *outpos;
	uint8_t *outend = *outpos + outlen;
	uint8_t *inend = *inpos + inlen;

	if (flags & FLAG_LENGTH_BYTE) {
		int len = 0;
		uint8_t *ip;

		ip = *inpos;
		while(ip < inend) {
			if (*ip == ',') {
				ip++;
				if (!(flags & FLAG_IGNORE_COMMAS))
					break;

				continue;
			}
			len++;
			ip++;
		}
		CHECK_SPACE(1);
		**outpos = (len / 2);
		*outpos += 1;
	}

	while(*inpos < inend) {
		if (**inpos == ',') {
			*inpos += 1;
			if (!(flags & FLAG_IGNORE_COMMAS))
				break;

			continue;
		}

		CHECK_SPACE(1);
		CHECK_AVAIL(2);

		**outpos = ascii_to_nibble(**inpos) << 4;
		*inpos += 1;
		**outpos |= ascii_to_nibble(**inpos);
		*inpos += 1; *outpos += 1;
	}

	return *outpos - buf_out;
}

static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
{
	uint8_t out[1024];
	uint8_t *outpos;
	uint8_t *inpos;
	int fd = *((int*)data);
	int w;

	if (buf_len < 1)
		return 1;

	memset(out, 0, sizeof(out));
	outpos = out;
	inpos = buf;

	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
	switch(buf[0]) {
		case 'H':
			if (impersonate_hmlanif) {
				buf[5] = 'L';
				buf[6] = 'A';
				buf[7] = 'N';
			}
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);

			break;
		case 'E':
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE | FLAG_NL);

			break;
		case 'R':
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE | FLAG_NL);

			break;
		case 'I':
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);

			break;
		default:
			format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
			hexdump(buf, buf_len, "Unknown> ");
			break;
	}
	if (debug)
		fprintf(stderr, "LAN < %s\n", out);

	w = write(fd, out, outpos-out);
	if (w <= 0) {
		perror("write");
		return 0;
	}

	return 1;
}

static int hmlan_parse_in(int fd, void *data)
{
	struct hmcfgusb_dev *dev = data;
	uint8_t buf[1025];
	uint8_t out[0x40]; //FIXME!!!
	uint8_t *outpos;
	uint8_t *inpos;
	int i;
	int last;
	int r;

	memset(buf, 0, sizeof(buf));

	r = read(fd, buf, sizeof(buf)-1);
	if (r > 0) {
		uint8_t *inend = buf + r;

		inpos = buf;

		if (debug)
			fprintf(stderr, "\nLAN > %s", buf);

		while (inpos < inend) {
			uint8_t *instart = inpos;

			if ((*inpos == '\r') || (*inpos == '\n')) {
				inpos++;
				continue;
			}
			
			outpos = out;

			last = inend - inpos;

			for (i = 0; i < last; i++) {
				if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
					last = i;
					break;
				}
			}

			if (last == 0)
				continue;

			memset(out, 0, sizeof(out));
			*outpos++ = *inpos++;

			switch(buf[0]) {
				case 'S':
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
					break;
				default:
					parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
					break;
			}

			hmcfgusb_send(dev, out, sizeof(out), 1);
		}
	} else if (r < 0) {
		perror("read");
		return r;
	} else {
		return 0;
	}

	return 1;
}

static int comm(int fd_in, int fd_out, int master_socket)
{
	struct hmcfgusb_dev *dev;
	int quit = 0;

	hmcfgusb_set_debug(debug);

	dev = hmcfgusb_init(hmlan_format_out, &fd_out);
	if (!dev) {
		fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
		return 0;
	}

	if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
		fprintf(stderr, "Can't add client to pollfd!\n");
		hmcfgusb_close(dev);
		return 0;
	}

	if (master_socket >= 0) {
		if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
			fprintf(stderr, "Can't add master_socket to pollfd!\n");
			hmcfgusb_close(dev);
			return 0;
		}
	}

	hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);

	while(!quit) {
		int fd;

		fd = hmcfgusb_poll(dev, 3600);
		if (fd >= 0) {
			if (fd == master_socket) {
				int client;

				client = accept(master_socket, NULL, 0);
				if (client >= 0) {
					shutdown(client, SHUT_RDWR);
					close(client);
				}
			} else {
				if (hmlan_parse_in(fd, dev) <= 0) {
					quit = 1;
				}
			}
		} else if (fd == -1) {
			if (errno) {
				perror("hmcfgusb_poll");
				quit = 1;
			}
		}
	}

	hmcfgusb_close(dev);
	return 1;
}

void sigterm_handler(int sig)
{
	if (unlink(PID_FILE) == -1)
		perror("Can't remove PID file");

	exit(EXIT_SUCCESS);
}

#define FLAG_DAEMON	(1 << 0)
#define FLAG_PID_FILE	(1 << 1)

static int socket_server(char *iface, int port, int flags)
{
	struct sigaction sact;
	struct sockaddr_in sin;
	int sock;
	int n;
	pid_t pid;

	if (flags & FLAG_DAEMON) {
		FILE *pidfile = NULL;

		if (flags & FLAG_PID_FILE) {
			mode_t old_umask;

			old_umask = umask(022);
			pidfile = fopen(PID_FILE, "w");
			umask(old_umask);

			if (!pidfile) {
				perror("Can't create PID file " PID_FILE);
				exit(EXIT_FAILURE);
			}

			memset(&sact, 0, sizeof(sact));
			sact.sa_handler = sigterm_handler;

			if (sigaction(SIGTERM, &sact, NULL) == -1) {
				perror("sigaction(SIGTERM)");
				exit(EXIT_FAILURE);
			}
		}

		pid = fork();
		if (pid > 0) {
			if (pidfile) {
				fprintf(pidfile, "%u\n", pid);
				fclose(pidfile);
			}

			printf("Daemon with PID %u started!\n", pid);
			exit(EXIT_SUCCESS);
		} else if (pid < 0) {
			perror("fork");
			exit(EXIT_FAILURE);
		}

		if (pidfile)
			fclose(pidfile);
	}

	memset(&sact, 0, sizeof(sact));
	sact.sa_handler = SIG_IGN;

	if (sigaction(SIGPIPE, &sact, NULL) == -1) {
		perror("sigaction(SIGPIPE)");
		exit(EXIT_FAILURE);
	}

	impersonate_hmlanif = 1;

	sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (sock == -1) {
		perror("Can't open socket");
		return EXIT_FAILURE;
	}

	n = 1;
	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
		perror("Can't set socket options");
		return EXIT_FAILURE;
	}

	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_port = htons(port);
	if (!iface) {
		sin.sin_addr.s_addr = htonl(INADDR_ANY);
	} else {
		if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
			perror("inet_ntop");
			return EXIT_FAILURE;
		}
	}

	if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
		perror("Can't bind socket");
		return EXIT_FAILURE;
	}

	if (listen(sock, 1) == -1) {
		perror("Can't listen on socket");
		return EXIT_FAILURE;
	}

	while(1) {
		struct sockaddr_in csin;
		socklen_t csinlen;
		int client;
		in_addr_t client_addr;

		memset(&csin, 0, sizeof(csin));
		csinlen = sizeof(csin);
		client = accept(sock, (struct sockaddr*)&csin, &csinlen);
		if (client == -1) {
			perror("Couldn't accept client");
			continue;
		}

		/* FIXME: getnameinfo... */
		client_addr = ntohl(csin.sin_addr.s_addr);

		if (verbose) {
			printf("Client %d.%d.%d.%d connected!\n",
					(client_addr & 0xff000000) >> 24,
					(client_addr & 0x00ff0000) >> 16,
					(client_addr & 0x0000ff00) >> 8,
					(client_addr & 0x000000ff));
		}

		comm(client, client, sock);

		shutdown(client, SHUT_RDWR);
		close(client);

		if (verbose) {
			printf("Connection to %d.%d.%d.%d closed!\n",
					(client_addr & 0xff000000) >> 24,
					(client_addr & 0x00ff0000) >> 16,
					(client_addr & 0x0000ff00) >> 8,
					(client_addr & 0x000000ff));
		}

	}

	return EXIT_SUCCESS;
}

static int interactive_server(void)
{
	if (!comm(STDIN_FILENO, STDOUT_FILENO, -1))
		return EXIT_FAILURE;

	return EXIT_SUCCESS;
}

void hmlan_syntax(char *prog)
{
	fprintf(stderr, "Syntax: %s options\n\n", prog);
	fprintf(stderr, "Possible options:\n");
	fprintf(stderr, "\t-D\tdebug mode\n");
	fprintf(stderr, "\t-d\tdaemon mode\n");
	fprintf(stderr, "\t-h\tthis help\n");
	fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
	fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
	fprintf(stderr, "\t-P\tcreate PID file " PID_FILE " in daemon mode\n");
	fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
	fprintf(stderr, "\t-v\tverbose mode\n");

}

int main(int argc, char **argv)
{
	int port = 1000;
	char *iface = NULL;
	int interactive = 0;
	int flags = 0;
	char *ep;
	int opt;

	while((opt = getopt(argc, argv, "DdhiPp:l:v")) != -1) {
		switch (opt) {
			case 'D':
				debug = 1;
				verbose = 1;
				break;
			case 'd':
				flags |= FLAG_DAEMON;
				break;
			case 'i':
				interactive = 1;
				break;
			case 'P':
				flags |= FLAG_PID_FILE;
				break;
			case 'p':
				port = strtoul(optarg, &ep, 10);
				if (*ep != '\0') {
					fprintf(stderr, "Can't parse port!\n");
					exit(EXIT_FAILURE);
				}
				break;
			case 'l':
				iface = optarg;
				break;
			case 'v':
				verbose = 1;
				break;
			case 'h':
			case ':':
			case '?':
			default:
				hmlan_syntax(argv[0]);
				exit(EXIT_FAILURE);
				break;
		}
	}
	
	if (interactive) {
		return interactive_server();
	} else {
		return socket_server(iface, port, flags);
	}
}
Commit	Line	Data
4732a863	1	/* HM-CFG-LAN emulation for HM-CFG-USB
9db2e455 MG	2	*
	3	* Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a copy
	6	* of this software and associated documentation files (the "Software"), to
	7	* deal in the Software without restriction, including without limitation the
	8	* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
	9	* sell copies of the Software, and to permit persons to whom the Software is
	10	* furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice shall be included in
	13	* all copies or substantial portions of the Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	21	* IN THE SOFTWARE.
	22	*/
	23
	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <unistd.h>
	27	#include <stdint.h>
	28	#include <string.h>
	29	#include <strings.h>
	30	#include <poll.h>
4371275b	31	#include <signal.h>
9db2e455	32	#include <errno.h>
e0a7146e MG	33	#include <sys/types.h>
e0a7146e MG	34	#include <sys/socket.h>
b0bf6ad2	35	#include <sys/stat.h>
e0a7146e MG	36	#include <netinet/in.h>
e0a7146e MG	37	#include <arpa/inet.h>
9db2e455 MG	38	#include <libusb-1.0/libusb.h>
	39
	40	#include "hexdump.h"
	41	#include "hmcfgusb.h"
	42
b0bf6ad2 MG	43	#define PID_FILE "/var/run/hmland.pid"
b0bf6ad2 MG	44
627e3f33 MG	45	extern char *optarg;
627e3f33 MG	46
e0a7146e	47	static int impersonate_hmlanif = 0;
627e3f33 MG	48	static int debug = 0;
627e3f33 MG	49	static int verbose = 0;
e0a7146e	50
e75295bb MG	51	#define FLAG_LENGTH_BYTE (1<<0)
	52	#define FLAG_FORMAT_HEX (1<<1)
	53	#define FLAG_COMMA_BEFORE (1<<2)
	54	#define FLAG_COMMA_AFTER (1<<3)
	55	#define FLAG_NL (1<<4)
	56	#define FLAG_IGNORE_COMMAS (1<<5)
	57
	58	#define CHECK_SPACE(x) if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
	59	#define CHECK_AVAIL(x) if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
	60
	61	static int format_part_out(uint8_t inpos, int inlen, uint8_t outpos, int outlen, int len, int flags)
	62	{
51d4ece6 MG	63	const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
51d4ece6 MG	64	'A', 'B', 'C', 'D', 'E', 'F'};
e75295bb MG	65	uint8_t buf_out = outpos;
	66	uint8_t outend = outpos + outlen;
	67	uint8_t inend = inpos + inlen;
	68	int i;
	69
	70	if (flags & FLAG_COMMA_BEFORE) {
	71	CHECK_SPACE(1);
	72	**outpos=',';
	73	*outpos += 1;
	74	}
	75
	76	if (flags & FLAG_LENGTH_BYTE) {
	77	CHECK_AVAIL(1);
	78	len = **inpos;
	79	*inpos += 1;
	80	}
	81
	82	if (flags & FLAG_FORMAT_HEX) {
e75295bb MG	83	CHECK_AVAIL(len);
	84	CHECK_SPACE(len*2);
	85	for (i = 0; i < len; i++) {
51d4ece6 MG	86	outpos = nibble[((inpos) & 0xf0) >> 4];
	87	*outpos += 1;
	88	outpos = nibble[((inpos) & 0xf)];
	89	inpos += 1; outpos += 1;
e75295bb MG	90	}
	91	} else {
	92	CHECK_AVAIL(len);
	93	CHECK_SPACE(len);
	94	memcpy(outpos, inpos, len);
	95	*outpos += len;
	96	*inpos += len;
	97	}
	98
	99	if (flags & FLAG_COMMA_AFTER) {
	100	CHECK_SPACE(1);
	101	**outpos=',';
	102	*outpos += 1;
	103	}
	104
	105	if (flags & FLAG_NL) {
	106	CHECK_SPACE(2);
	107	**outpos='\r';
	108	*outpos += 1;
	109	**outpos='\n';
	110	*outpos += 1;
	111	}
	112
	113	return *outpos - buf_out;
	114	}
	115
51d4ece6 MG	116	static uint8_t ascii_to_nibble(uint8_t a)
	117	{
	118	uint8_t c = 0x00;
	119
	120	if ((a >= '0') && (a <= '9')) {
	121	c = a - '0';
	122	} else if ((a >= 'A') && (a <= 'F')) {
	123	c = (a - 'A') + 10;
	124	} else if ((a >= 'a') && (a <= 'f')) {
	125	c = (a - 'a') + 10;
	126	}
	127
	128	return c;
	129	}
	130
e75295bb MG	131	static int parse_part_in(uint8_t inpos, int inlen, uint8_t outpos, int outlen, int flags)
	132	{
	133	uint8_t buf_out = outpos;
	134	uint8_t outend = outpos + outlen;
	135	uint8_t inend = inpos + inlen;
e75295bb MG	136
	137	if (flags & FLAG_LENGTH_BYTE) {
	138	int len = 0;
	139	uint8_t *ip;
	140
	141	ip = *inpos;
	142	while(ip < inend) {
	143	if (*ip == ',') {
	144	ip++;
	145	if (!(flags & FLAG_IGNORE_COMMAS))
	146	break;
	147
	148	continue;
	149	}
	150	len++;
	151	ip++;
	152	}
	153	CHECK_SPACE(1);
	154	**outpos = (len / 2);
	155	*outpos += 1;
	156	}
	157
	158	while(*inpos < inend) {
	159	if (**inpos == ',') {
	160	*inpos += 1;
	161	if (!(flags & FLAG_IGNORE_COMMAS))
	162	break;
	163
	164	continue;
	165	}
	166
	167	CHECK_SPACE(1);
	168	CHECK_AVAIL(2);
e75295bb	169
51d4ece6 MG	170	outpos = ascii_to_nibble(inpos) << 4;
	171	*inpos += 1;
	172	outpos \|= ascii_to_nibble(inpos);
	173	inpos += 1; outpos += 1;
e75295bb MG	174	}
	175
	176	return *outpos - buf_out;
	177	}
	178
4371275b	179	static int hmlan_format_out(uint8_t buf, int buf_len, void data)
9db2e455	180	{
e75295bb MG	181	uint8_t out[1024];
	182	uint8_t *outpos;
	183	uint8_t *inpos;
e0a7146e	184	int fd = ((int)data);
4371275b	185	int w;
9db2e455 MG	186
9db2e455 MG	187	if (buf_len < 1)
4371275b	188	return 1;
9db2e455	189
e0a7146e	190	memset(out, 0, sizeof(out));
e75295bb MG	191	outpos = out;
e75295bb MG	192	inpos = buf;
e0a7146e	193
e75295bb	194	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
9db2e455 MG	195	switch(buf[0]) {
9db2e455 MG	196	case 'H':
e0a7146e MG	197	if (impersonate_hmlanif) {
	198	buf[5] = 'L';
	199	buf[6] = 'A';
	200	buf[7] = 'N';
	201	}
e75295bb MG	202	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
	203	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	204	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE \| FLAG_LENGTH_BYTE);
	205	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	206	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	207	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	208	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE \| FLAG_NL);
9db2e455 MG	209
	210	break;
	211	case 'E':
e75295bb MG	212	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
	213	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	214	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	215	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	216	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	217	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE \| FLAG_LENGTH_BYTE \| FLAG_NL);
	218
9db2e455 MG	219	break;
9db2e455 MG	220	case 'R':
e75295bb MG	221	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
	222	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	223	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	224	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	225	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	226	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE \| FLAG_LENGTH_BYTE \| FLAG_NL);
	227
9db2e455 MG	228	break;
9db2e455 MG	229	case 'I':
e75295bb MG	230	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
	231	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	232	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE);
	233	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX \| FLAG_COMMA_BEFORE \| FLAG_NL);
	234
	235	break;
9db2e455	236	default:
e75295bb	237	format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX \| FLAG_NL);
9db2e455 MG	238	hexdump(buf, buf_len, "Unknown> ");
	239	break;
	240	}
627e3f33 MG	241	if (debug)
627e3f33 MG	242	fprintf(stderr, "LAN < %s\n", out);
4371275b MG	243
	244	w = write(fd, out, outpos-out);
	245	if (w <= 0) {
	246	perror("write");
	247	return 0;
	248	}
	249
	250	return 1;
9db2e455 MG	251	}
9db2e455 MG	252
e0a7146e	253	static int hmlan_parse_in(int fd, void *data)
9db2e455 MG	254	{
9db2e455 MG	255	struct hmcfgusb_dev *dev = data;
627e3f33	256	uint8_t buf[1025];
e75295bb MG	257	uint8_t out[0x40]; //FIXME!!!
	258	uint8_t *outpos;
	259	uint8_t *inpos;
9db2e455	260	int i;
627e3f33	261	int last;
9db2e455 MG	262	int r;
9db2e455 MG	263
627e3f33 MG	264	memset(buf, 0, sizeof(buf));
	265
	266	r = read(fd, buf, sizeof(buf)-1);
9db2e455	267	if (r > 0) {
627e3f33 MG	268	uint8_t *inend = buf + r;
	269
	270	inpos = buf;
	271
	272	if (debug)
e2572b06	273	fprintf(stderr, "\nLAN > %s", buf);
627e3f33 MG	274
	275	while (inpos < inend) {
	276	uint8_t *instart = inpos;
	277
	278	if ((inpos == '\r') \|\| (inpos == '\n')) {
	279	inpos++;
	280	continue;
9db2e455	281	}
627e3f33 MG	282
627e3f33 MG	283	outpos = out;
9db2e455	284
627e3f33 MG	285	last = inend - inpos;
	286
	287	for (i = 0; i < last; i++) {
	288	if ((inpos[i] == '\r') \|\| (inpos[i] == '\n')) {
	289	last = i;
	290	break;
	291	}
	292	}
	293
	294	if (last == 0)
	295	continue;
	296
	297	memset(out, 0, sizeof(out));
	298	outpos++ = inpos++;
	299
	300	switch(buf[0]) {
	301	case 'S':
	302	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
	303	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
	304	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
	305	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
	306	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
	307	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
	308	break;
	309	default:
	310	parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
	311	break;
	312	}
e75295bb	313
33df13be	314	hmcfgusb_send(dev, out, sizeof(out), 1);
627e3f33	315	}
9db2e455 MG	316	} else if (r < 0) {
9db2e455 MG	317	perror("read");
e0a7146e MG	318	return r;
	319	} else {
	320	return 0;
9db2e455	321	}
e0a7146e MG	322
e0a7146e MG	323	return 1;
9db2e455 MG	324	}
9db2e455 MG	325
e0a7146e	326	static int comm(int fd_in, int fd_out, int master_socket)
9db2e455 MG	327	{
	328	struct hmcfgusb_dev *dev;
	329	int quit = 0;
	330
627e3f33 MG	331	hmcfgusb_set_debug(debug);
627e3f33 MG	332
e0a7146e	333	dev = hmcfgusb_init(hmlan_format_out, &fd_out);
9db2e455 MG	334	if (!dev) {
9db2e455 MG	335	fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
e0a7146e MG	336	return 0;
	337	}
	338
	339	if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
	340	fprintf(stderr, "Can't add client to pollfd!\n");
	341	hmcfgusb_close(dev);
	342	return 0;
9db2e455 MG	343	}
9db2e455 MG	344
e0a7146e MG	345	if (master_socket >= 0) {
	346	if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
	347	fprintf(stderr, "Can't add master_socket to pollfd!\n");
	348	hmcfgusb_close(dev);
	349	return 0;
	350	}
9db2e455 MG	351	}
	352
	353	hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
	354
	355	while(!quit) {
	356	int fd;
	357
	358	fd = hmcfgusb_poll(dev, 3600);
	359	if (fd >= 0) {
e0a7146e MG	360	if (fd == master_socket) {
	361	int client;
	362
	363	client = accept(master_socket, NULL, 0);
	364	if (client >= 0) {
	365	shutdown(client, SHUT_RDWR);
	366	close(client);
	367	}
	368	} else {
	369	if (hmlan_parse_in(fd, dev) <= 0) {
	370	quit = 1;
	371	}
	372	}
9db2e455 MG	373	} else if (fd == -1) {
	374	if (errno) {
	375	perror("hmcfgusb_poll");
	376	quit = 1;
	377	}
	378	}
	379	}
	380
813afd12	381	hmcfgusb_close(dev);
e0a7146e MG	382	return 1;
	383	}
	384
b0bf6ad2 MG	385	void sigterm_handler(int sig)
	386	{
	387	if (unlink(PID_FILE) == -1)
	388	perror("Can't remove PID file");
	389
	390	exit(EXIT_SUCCESS);
	391	}
	392
	393	#define FLAG_DAEMON (1 << 0)
	394	#define FLAG_PID_FILE (1 << 1)
	395
	396	static int socket_server(char *iface, int port, int flags)
e0a7146e	397	{
4371275b	398	struct sigaction sact;
e0a7146e MG	399	struct sockaddr_in sin;
	400	int sock;
	401	int n;
627e3f33 MG	402	pid_t pid;
627e3f33 MG	403
b0bf6ad2 MG	404	if (flags & FLAG_DAEMON) {
	405	FILE *pidfile = NULL;
	406
	407	if (flags & FLAG_PID_FILE) {
	408	mode_t old_umask;
	409
	410	old_umask = umask(022);
	411	pidfile = fopen(PID_FILE, "w");
	412	umask(old_umask);
	413
	414	if (!pidfile) {
	415	perror("Can't create PID file " PID_FILE);
	416	exit(EXIT_FAILURE);
	417	}
	418
	419	memset(&sact, 0, sizeof(sact));
	420	sact.sa_handler = sigterm_handler;
	421
	422	if (sigaction(SIGTERM, &sact, NULL) == -1) {
	423	perror("sigaction(SIGTERM)");
	424	exit(EXIT_FAILURE);
	425	}
	426	}
	427
627e3f33 MG	428	pid = fork();
627e3f33 MG	429	if (pid > 0) {
b0bf6ad2 MG	430	if (pidfile) {
	431	fprintf(pidfile, "%u\n", pid);
	432	fclose(pidfile);
	433	}
	434
627e3f33 MG	435	printf("Daemon with PID %u started!\n", pid);
	436	exit(EXIT_SUCCESS);
	437	} else if (pid < 0) {
	438	perror("fork");
	439	exit(EXIT_FAILURE);
	440	}
b0bf6ad2 MG	441
	442	if (pidfile)
	443	fclose(pidfile);
627e3f33	444	}
e0a7146e	445
4371275b MG	446	memset(&sact, 0, sizeof(sact));
	447	sact.sa_handler = SIG_IGN;
	448
	449	if (sigaction(SIGPIPE, &sact, NULL) == -1) {
b0bf6ad2	450	perror("sigaction(SIGPIPE)");
27f4063e	451	exit(EXIT_FAILURE);
4371275b MG	452	}
4371275b MG	453
e0a7146e MG	454	impersonate_hmlanif = 1;
	455
	456	sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	457	if (sock == -1) {
	458	perror("Can't open socket");
	459	return EXIT_FAILURE;
	460	}
	461
	462	n = 1;
	463	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
	464	perror("Can't set socket options");
	465	return EXIT_FAILURE;
	466	}
	467
	468	memset(&sin, 0, sizeof(sin));
	469	sin.sin_family = AF_INET;
	470	sin.sin_port = htons(port);
4a8a2269 MG	471	if (!iface) {
	472	sin.sin_addr.s_addr = htonl(INADDR_ANY);
	473	} else {
	474	if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
	475	perror("inet_ntop");
	476	return EXIT_FAILURE;
	477	}
	478	}
e0a7146e MG	479
	480	if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
	481	perror("Can't bind socket");
	482	return EXIT_FAILURE;
	483	}
	484
	485	if (listen(sock, 1) == -1) {
	486	perror("Can't listen on socket");
	487	return EXIT_FAILURE;
	488	}
	489
	490	while(1) {
	491	struct sockaddr_in csin;
	492	socklen_t csinlen;
	493	int client;
627e3f33	494	in_addr_t client_addr;
e0a7146e MG	495
	496	memset(&csin, 0, sizeof(csin));
	497	csinlen = sizeof(csin);
	498	client = accept(sock, (struct sockaddr*)&csin, &csinlen);
	499	if (client == -1) {
	500	perror("Couldn't accept client");
	501	continue;
	502	}
	503
627e3f33 MG	504	/* FIXME: getnameinfo... */
	505	client_addr = ntohl(csin.sin_addr.s_addr);
	506
	507	if (verbose) {
	508	printf("Client %d.%d.%d.%d connected!\n",
	509	(client_addr & 0xff000000) >> 24,
	510	(client_addr & 0x00ff0000) >> 16,
	511	(client_addr & 0x0000ff00) >> 8,
	512	(client_addr & 0x000000ff));
	513	}
e0a7146e MG	514
	515	comm(client, client, sock);
	516
	517	shutdown(client, SHUT_RDWR);
	518	close(client);
	519
627e3f33 MG	520	if (verbose) {
	521	printf("Connection to %d.%d.%d.%d closed!\n",
	522	(client_addr & 0xff000000) >> 24,
	523	(client_addr & 0x00ff0000) >> 16,
	524	(client_addr & 0x0000ff00) >> 8,
	525	(client_addr & 0x000000ff));
	526	}
e0a7146e MG	527
	528	}
	529
	530	return EXIT_SUCCESS;
	531	}
	532
	533	static int interactive_server(void)
	534	{
	535	if (!comm(STDIN_FILENO, STDOUT_FILENO, -1))
	536	return EXIT_FAILURE;
9db2e455 MG	537
	538	return EXIT_SUCCESS;
	539	}
e0a7146e	540
627e3f33 MG	541	void hmlan_syntax(char *prog)
	542	{
	543	fprintf(stderr, "Syntax: %s options\n\n", prog);
	544	fprintf(stderr, "Possible options:\n");
	545	fprintf(stderr, "\t-D\tdebug mode\n");
	546	fprintf(stderr, "\t-d\tdaemon mode\n");
	547	fprintf(stderr, "\t-h\tthis help\n");
	548	fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
4a8a2269	549	fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
b0bf6ad2	550	fprintf(stderr, "\t-P\tcreate PID file " PID_FILE " in daemon mode\n");
627e3f33 MG	551	fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
	552	fprintf(stderr, "\t-v\tverbose mode\n");
	553
	554	}
	555
e0a7146e MG	556	int main(int argc, char **argv)
e0a7146e MG	557	{
627e3f33	558	int port = 1000;
4a8a2269	559	char *iface = NULL;
627e3f33	560	int interactive = 0;
b0bf6ad2	561	int flags = 0;
627e3f33 MG	562	char *ep;
	563	int opt;
	564
b0bf6ad2	565	while((opt = getopt(argc, argv, "DdhiPp:l:v")) != -1) {
627e3f33 MG	566	switch (opt) {
	567	case 'D':
	568	debug = 1;
	569	verbose = 1;
	570	break;
	571	case 'd':
b0bf6ad2	572	flags \|= FLAG_DAEMON;
627e3f33 MG	573	break;
	574	case 'i':
	575	interactive = 1;
	576	break;
b0bf6ad2 MG	577	case 'P':
	578	flags \|= FLAG_PID_FILE;
	579	break;
627e3f33 MG	580	case 'p':
	581	port = strtoul(optarg, &ep, 10);
	582	if (*ep != '\0') {
	583	fprintf(stderr, "Can't parse port!\n");
	584	exit(EXIT_FAILURE);
	585	}
	586	break;
4a8a2269 MG	587	case 'l':
	588	iface = optarg;
	589	break;
627e3f33 MG	590	case 'v':
	591	verbose = 1;
	592	break;
	593	case 'h':
	594	case ':':
	595	case '?':
	596	default:
	597	hmlan_syntax(argv[0]);
	598	exit(EXIT_FAILURE);
	599	break;
	600	}
	601	}
	602
	603	if (interactive) {
	604	return interactive_server();
	605	} else {
b0bf6ad2	606	return socket_server(iface, port, flags);
627e3f33	607	}
e0a7146e	608	}