git.zerfleddert.de Git - hmcfgusb/blob - hmland.c

   1 /* HM-CFG-LAN emulation for HM-CFG-USB
   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>
  31 #include <signal.h>
  32 #include <errno.h>
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <sys/stat.h>
  36 #include <fcntl.h>
  37 #include <netinet/in.h>
  38 #include <arpa/inet.h>
  39 #include <libusb-1.0/libusb.h>
  40
  41 #include "hexdump.h"
  42 #include "hmcfgusb.h"
  43
  44 #define PID_FILE "/var/run/hmland.pid"
  45
  46 extern char *optarg;
  47
  48 static int impersonate_hmlanif = 0;
  49 static int debug = 0;
  50 static int verbose = 0;
  51
  52 #define FLAG_LENGTH_BYTE        (1<<0)
  53 #define FLAG_FORMAT_HEX         (1<<1)
  54 #define FLAG_COMMA_BEFORE       (1<<2)
  55 #define FLAG_COMMA_AFTER        (1<<3)
  56 #define FLAG_NL                 (1<<4)
  57 #define FLAG_IGNORE_COMMAS      (1<<5)
  58
  59 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  60 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  61
  62 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  63 {
  64         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  65                 'A', 'B', 'C', 'D', 'E', 'F'};
  66         uint8_t *buf_out = *outpos;
  67         uint8_t *outend = *outpos + outlen;
  68         uint8_t *inend = *inpos + inlen;
  69         int i;
  70
  71         if (flags & FLAG_COMMA_BEFORE) {
  72                 CHECK_SPACE(1);
  73                 **outpos=',';
  74                 *outpos += 1;
  75         }
  76
  77         if (flags & FLAG_LENGTH_BYTE) {
  78                 CHECK_AVAIL(1);
  79                 len = **inpos;
  80                 *inpos += 1;
  81         }
  82
  83         if (flags & FLAG_FORMAT_HEX) {
  84                 CHECK_AVAIL(len);
  85                 CHECK_SPACE(len*2);
  86                 for (i = 0; i < len; i++) {
  87                         **outpos = nibble[((**inpos) & 0xf0) >> 4];
  88                         *outpos += 1;
  89                         **outpos = nibble[((**inpos) & 0xf)];
  90                         *inpos += 1; *outpos += 1;
  91                 }
  92         } else {
  93                 CHECK_AVAIL(len);
  94                 CHECK_SPACE(len);
  95                 memcpy(*outpos, *inpos, len);
  96                 *outpos += len;
  97                 *inpos += len;
  98         }
  99
 100         if (flags & FLAG_COMMA_AFTER) {
 101                 CHECK_SPACE(1);
 102                 **outpos=',';
 103                 *outpos += 1;
 104         }
 105
 106         if (flags & FLAG_NL) {
 107                 CHECK_SPACE(2);
 108                 **outpos='\r';
 109                 *outpos += 1;
 110                 **outpos='\n';
 111                 *outpos += 1;
 112         }
 113
 114         return *outpos - buf_out;
 115 }
 116
 117 static uint8_t ascii_to_nibble(uint8_t a)
 118 {
 119         uint8_t c = 0x00;
 120
 121         if ((a >= '0') && (a <= '9')) {
 122                 c = a - '0';
 123         } else if ((a >= 'A') && (a <= 'F')) {
 124                 c = (a - 'A') + 10;
 125         } else if ((a >= 'a') && (a <= 'f')) {
 126                 c = (a - 'a') + 10;
 127         }
 128
 129         return c;
 130 }
 131
 132 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 133 {
 134         uint8_t *buf_out = *outpos;
 135         uint8_t *outend = *outpos + outlen;
 136         uint8_t *inend = *inpos + inlen;
 137
 138         if (flags & FLAG_LENGTH_BYTE) {
 139                 int len = 0;
 140                 uint8_t *ip;
 141
 142                 ip = *inpos;
 143                 while(ip < inend) {
 144                         if (*ip == ',') {
 145                                 ip++;
 146                                 if (!(flags & FLAG_IGNORE_COMMAS))
 147                                         break;
 148
 149                                 continue;
 150                         }
 151                         len++;
 152                         ip++;
 153                 }
 154                 CHECK_SPACE(1);
 155                 **outpos = (len / 2);
 156                 *outpos += 1;
 157         }
 158
 159         while(*inpos < inend) {
 160                 if (**inpos == ',') {
 161                         *inpos += 1;
 162                         if (!(flags & FLAG_IGNORE_COMMAS))
 163                                 break;
 164
 165                         continue;
 166                 }
 167
 168                 CHECK_SPACE(1);
 169                 CHECK_AVAIL(2);
 170
 171                 **outpos = ascii_to_nibble(**inpos) << 4;
 172                 *inpos += 1;
 173                 **outpos |= ascii_to_nibble(**inpos);
 174                 *inpos += 1; *outpos += 1;
 175         }
 176
 177         return *outpos - buf_out;
 178 }
 179
 180 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 181 {
 182         uint8_t out[1024];
 183         uint8_t *outpos;
 184         uint8_t *inpos;
 185         int fd = *((int*)data);
 186         int w;
 187
 188         if (buf_len < 1)
 189                 return 1;
 190
 191         memset(out, 0, sizeof(out));
 192         outpos = out;
 193         inpos = buf;
 194
 195         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 196         switch(buf[0]) {
 197                 case 'H':
 198                         if (impersonate_hmlanif) {
 199                                 buf[5] = 'L';
 200                                 buf[6] = 'A';
 201                                 buf[7] = 'N';
 202                         }
 203                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 204                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 205                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 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)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 208                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 209                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 210
 211                         break;
 212                 case 'E':
 213                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 214                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 215                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 216                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 217                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 218                         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);
 219
 220                         break;
 221                 case 'R':
 222                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 223                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 224                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 225                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 226                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 227                         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);
 228
 229                         break;
 230                 case 'I':
 231                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 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);
 234                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 235
 236                         break;
 237                 default:
 238                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 239                         hexdump(buf, buf_len, "Unknown> ");
 240                         break;
 241         }
 242         if (debug)
 243                 fprintf(stderr, "LAN < %s\n", out);
 244
 245         w = write(fd, out, outpos-out);
 246         if (w <= 0) {
 247                 perror("write");
 248                 return 0;
 249         }
 250
 251         return 1;
 252 }
 253
 254 static int hmlan_parse_in(int fd, void *data)
 255 {
 256         struct hmcfgusb_dev *dev = data;
 257         uint8_t buf[1025];
 258         uint8_t out[0x40]; //FIXME!!!
 259         uint8_t *outpos;
 260         uint8_t *inpos;
 261         int i;
 262         int last;
 263         int r;
 264
 265         memset(buf, 0, sizeof(buf));
 266
 267         r = read(fd, buf, sizeof(buf)-1);
 268         if (r > 0) {
 269                 uint8_t *inend = buf + r;
 270
 271                 inpos = buf;
 272
 273                 if (debug)
 274                         fprintf(stderr, "\nLAN > %s", buf);
 275
 276                 while (inpos < inend) {
 277                         uint8_t *instart = inpos;
 278
 279                         if ((*inpos == '\r') || (*inpos == '\n')) {
 280                                 inpos++;
 281                                 continue;
 282                         }
 283
 284                         outpos = out;
 285
 286                         last = inend - inpos;
 287
 288                         for (i = 0; i < last; i++) {
 289                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 290                                         last = i;
 291                                         break;
 292                                 }
 293                         }
 294
 295                         if (last == 0)
 296                                 continue;
 297
 298                         memset(out, 0, sizeof(out));
 299                         *outpos++ = *inpos++;
 300
 301                         switch(buf[0]) {
 302                                 case 'S':
 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)), 0);
 308                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 309                                         break;
 310                                 default:
 311                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 312                                         break;
 313                         }
 314
 315                         hmcfgusb_send(dev, out, sizeof(out), 1);
 316                 }
 317         } else if (r < 0) {
 318                 perror("read");
 319                 return r;
 320         } else {
 321                 return 0;
 322         }
 323
 324         return 1;
 325 }
 326
 327 static int comm(int fd_in, int fd_out, int master_socket)
 328 {
 329         struct hmcfgusb_dev *dev;
 330         int quit = 0;
 331
 332         hmcfgusb_set_debug(debug);
 333
 334         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 335         if (!dev) {
 336                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 337                 return 0;
 338         }
 339
 340         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 341                 fprintf(stderr, "Can't add client to pollfd!\n");
 342                 hmcfgusb_close(dev);
 343                 return 0;
 344         }
 345
 346         if (master_socket >= 0) {
 347                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 348                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 349                         hmcfgusb_close(dev);
 350                         return 0;
 351                 }
 352         }
 353
 354         hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
 355
 356         while(!quit) {
 357                 int fd;
 358
 359                 fd = hmcfgusb_poll(dev, 3600);
 360                 if (fd >= 0) {
 361                         if (fd == master_socket) {
 362                                 int client;
 363
 364                                 client = accept(master_socket, NULL, 0);
 365                                 if (client >= 0) {
 366                                         shutdown(client, SHUT_RDWR);
 367                                         close(client);
 368                                 }
 369                         } else {
 370                                 if (hmlan_parse_in(fd, dev) <= 0) {
 371                                         quit = 1;
 372                                 }
 373                         }
 374                 } else if (fd == -1) {
 375                         if (errno) {
 376                                 perror("hmcfgusb_poll");
 377                                 quit = 1;
 378                         }
 379                 }
 380         }
 381
 382         hmcfgusb_close(dev);
 383         return 1;
 384 }
 385
 386 void sigterm_handler(int sig)
 387 {
 388         if (unlink(PID_FILE) == -1)
 389                 perror("Can't remove PID file");
 390
 391         exit(EXIT_SUCCESS);
 392 }
 393
 394 #define FLAG_DAEMON     (1 << 0)
 395 #define FLAG_PID_FILE   (1 << 1)
 396
 397 static int socket_server(char *iface, int port, int flags)
 398 {
 399         struct sigaction sact;
 400         struct sockaddr_in sin;
 401         int sock;
 402         int n;
 403         pid_t pid;
 404
 405         if (flags & FLAG_DAEMON) {
 406                 FILE *pidfile = NULL;
 407
 408                 if (flags & FLAG_PID_FILE) {
 409                         int fd;
 410
 411                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 412                         if (fd == -1) {
 413                                 if (errno == EEXIST) {
 414                                         pid_t old_pid;
 415                                         pidfile = fopen(PID_FILE, "r");
 416                                         if (!pidfile) {
 417                                                 perror("PID file " PID_FILE " already exists, already running?");
 418                                                 exit(EXIT_FAILURE);
 419                                         }
 420
 421                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 422                                                 fclose(pidfile);
 423                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 424                                                 exit(EXIT_FAILURE);
 425                                         }
 426
 427                                         fclose(pidfile);
 428
 429                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 430                                         exit(EXIT_FAILURE);
 431                                 }
 432                                 perror("Can't create PID file " PID_FILE);
 433                                 exit(EXIT_FAILURE);
 434                         }
 435
 436                         pidfile = fdopen(fd, "w");
 437                         if (!pidfile) {
 438                                 perror("Can't reopen PID file fd");
 439                                 exit(EXIT_FAILURE);
 440                         }
 441
 442                         memset(&sact, 0, sizeof(sact));
 443                         sact.sa_handler = sigterm_handler;
 444
 445                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 446                                 perror("sigaction(SIGTERM)");
 447                                 exit(EXIT_FAILURE);
 448                         }
 449                 }
 450
 451                 pid = fork();
 452                 if (pid > 0) {
 453                         if (pidfile) {
 454                                 fprintf(pidfile, "%u\n", pid);
 455                                 fclose(pidfile);
 456                         }
 457
 458                         printf("Daemon with PID %u started!\n", pid);
 459                         exit(EXIT_SUCCESS);
 460                 } else if (pid < 0) {
 461                         perror("fork");
 462                         exit(EXIT_FAILURE);
 463                 }
 464
 465                 if (pidfile)
 466                         fclose(pidfile);
 467         }
 468
 469         memset(&sact, 0, sizeof(sact));
 470         sact.sa_handler = SIG_IGN;
 471
 472         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 473                 perror("sigaction(SIGPIPE)");
 474                 exit(EXIT_FAILURE);
 475         }
 476
 477         impersonate_hmlanif = 1;
 478
 479         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 480         if (sock == -1) {
 481                 perror("Can't open socket");
 482                 return EXIT_FAILURE;
 483         }
 484
 485         n = 1;
 486         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 487                 perror("Can't set socket options");
 488                 return EXIT_FAILURE;
 489         }
 490
 491         memset(&sin, 0, sizeof(sin));
 492         sin.sin_family = AF_INET;
 493         sin.sin_port = htons(port);
 494         if (!iface) {
 495                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 496         } else {
 497                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 498                         perror("inet_ntop");
 499                         return EXIT_FAILURE;
 500                 }
 501         }
 502
 503         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 504                 perror("Can't bind socket");
 505                 return EXIT_FAILURE;
 506         }
 507
 508         if (listen(sock, 1) == -1) {
 509                 perror("Can't listen on socket");
 510                 return EXIT_FAILURE;
 511         }
 512
 513         while(1) {
 514                 struct sockaddr_in csin;
 515                 socklen_t csinlen;
 516                 int client;
 517                 in_addr_t client_addr;
 518
 519                 memset(&csin, 0, sizeof(csin));
 520                 csinlen = sizeof(csin);
 521                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 522                 if (client == -1) {
 523                         perror("Couldn't accept client");
 524                         continue;
 525                 }
 526
 527                 /* FIXME: getnameinfo... */
 528                 client_addr = ntohl(csin.sin_addr.s_addr);
 529
 530                 if (verbose) {
 531                         printf("Client %d.%d.%d.%d connected!\n",
 532                                         (client_addr & 0xff000000) >> 24,
 533                                         (client_addr & 0x00ff0000) >> 16,
 534                                         (client_addr & 0x0000ff00) >> 8,
 535                                         (client_addr & 0x000000ff));
 536                 }
 537
 538                 comm(client, client, sock);
 539
 540                 shutdown(client, SHUT_RDWR);
 541                 close(client);
 542
 543                 if (verbose) {
 544                         printf("Connection to %d.%d.%d.%d closed!\n",
 545                                         (client_addr & 0xff000000) >> 24,
 546                                         (client_addr & 0x00ff0000) >> 16,
 547                                         (client_addr & 0x0000ff00) >> 8,
 548                                         (client_addr & 0x000000ff));
 549                 }
 550
 551         }
 552
 553         return EXIT_SUCCESS;
 554 }
 555
 556 static int interactive_server(void)
 557 {
 558         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1))
 559                 return EXIT_FAILURE;
 560
 561         return EXIT_SUCCESS;
 562 }
 563
 564 void hmlan_syntax(char *prog)
 565 {
 566         fprintf(stderr, "Syntax: %s options\n\n", prog);
 567         fprintf(stderr, "Possible options:\n");
 568         fprintf(stderr, "\t-D\tdebug mode\n");
 569         fprintf(stderr, "\t-d\tdaemon mode\n");
 570         fprintf(stderr, "\t-h\tthis help\n");
 571         fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 572         fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
 573         fprintf(stderr, "\t-P\tcreate PID file " PID_FILE " in daemon mode\n");
 574         fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
 575         fprintf(stderr, "\t-v\tverbose mode\n");
 576
 577 }
 578
 579 int main(int argc, char **argv)
 580 {
 581         int port = 1000;
 582         char *iface = NULL;
 583         int interactive = 0;
 584         int flags = 0;
 585         char *ep;
 586         int opt;
 587
 588         while((opt = getopt(argc, argv, "DdhiPp:l:v")) != -1) {
 589                 switch (opt) {
 590                         case 'D':
 591                                 debug = 1;
 592                                 verbose = 1;
 593                                 break;
 594                         case 'd':
 595                                 flags |= FLAG_DAEMON;
 596                                 break;
 597                         case 'i':
 598                                 interactive = 1;
 599                                 break;
 600                         case 'P':
 601                                 flags |= FLAG_PID_FILE;
 602                                 break;
 603                         case 'p':
 604                                 port = strtoul(optarg, &ep, 10);
 605                                 if (*ep != '\0') {
 606                                         fprintf(stderr, "Can't parse port!\n");
 607                                         exit(EXIT_FAILURE);
 608                                 }
 609                                 break;
 610                         case 'l':
 611                                 iface = optarg;
 612                                 break;
 613                         case 'v':
 614                                 verbose = 1;
 615                                 break;
 616                         case 'h':
 617                         case ':':
 618                         case '?':
 619                         default:
 620                                 hmlan_syntax(argv[0]);
 621                                 exit(EXIT_FAILURE);
 622                                 break;
 623                 }
 624         }
 625
 626         if (interactive) {
 627                 return interactive_server();
 628         } else {
 629                 return socket_server(iface, port, flags);
 630         }
 631 }