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 <time.h>
  38 #include <netinet/in.h>
  39 #include <arpa/inet.h>
  40 #include <libusb-1.0/libusb.h>
  41
  42 #include "hexdump.h"
  43 #include "hmcfgusb.h"
  44
  45 #define PID_FILE "/var/run/hmland.pid"
  46
  47 extern char *optarg;
  48
  49 static int impersonate_hmlanif = 0;
  50 static int debug = 0;
  51 static int verbose = 0;
  52
  53 struct queued_rx {
  54         char *rx;
  55         int len;
  56         struct queued_rx *next;
  57 };
  58
  59 static struct queued_rx *qrx = NULL;
  60 static int wait_for_h = 0;
  61
  62 #define FLAG_LENGTH_BYTE        (1<<0)
  63 #define FLAG_FORMAT_HEX         (1<<1)
  64 #define FLAG_COMMA_BEFORE       (1<<2)
  65 #define FLAG_COMMA_AFTER        (1<<3)
  66 #define FLAG_NL                 (1<<4)
  67 #define FLAG_IGNORE_COMMAS      (1<<5)
  68
  69 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  70 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  71
  72 static void print_timestamp(FILE *f)
  73 {
  74         struct timeval tv;
  75         struct tm *tmp;
  76         char ts[32];
  77
  78         gettimeofday(&tv, NULL);
  79         tmp = localtime(&tv.tv_sec);
  80         memset(ts, 0, sizeof(ts));
  81         strftime(ts, sizeof(ts)-1, "%Y-%m-%d %H:%M:%S", tmp);
  82         fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
  83 }
  84
  85 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  86 {
  87         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  88                 'A', 'B', 'C', 'D', 'E', 'F'};
  89         uint8_t *buf_out = *outpos;
  90         uint8_t *outend = *outpos + outlen;
  91         uint8_t *inend = *inpos + inlen;
  92         int i;
  93
  94         if (flags & FLAG_COMMA_BEFORE) {
  95                 CHECK_SPACE(1);
  96                 **outpos=',';
  97                 *outpos += 1;
  98         }
  99
 100         if (flags & FLAG_LENGTH_BYTE) {
 101                 CHECK_AVAIL(1);
 102                 len = **inpos;
 103                 *inpos += 1;
 104         }
 105
 106         if (flags & FLAG_FORMAT_HEX) {
 107                 CHECK_AVAIL(len);
 108                 CHECK_SPACE(len*2);
 109                 for (i = 0; i < len; i++) {
 110                         **outpos = nibble[((**inpos) & 0xf0) >> 4];
 111                         *outpos += 1;
 112                         **outpos = nibble[((**inpos) & 0xf)];
 113                         *inpos += 1; *outpos += 1;
 114                 }
 115         } else {
 116                 CHECK_AVAIL(len);
 117                 CHECK_SPACE(len);
 118                 memcpy(*outpos, *inpos, len);
 119                 *outpos += len;
 120                 *inpos += len;
 121         }
 122
 123         if (flags & FLAG_COMMA_AFTER) {
 124                 CHECK_SPACE(1);
 125                 **outpos=',';
 126                 *outpos += 1;
 127         }
 128
 129         if (flags & FLAG_NL) {
 130                 CHECK_SPACE(2);
 131                 **outpos='\r';
 132                 *outpos += 1;
 133                 **outpos='\n';
 134                 *outpos += 1;
 135         }
 136
 137         return *outpos - buf_out;
 138 }
 139
 140 static uint8_t ascii_to_nibble(uint8_t a)
 141 {
 142         uint8_t c = 0x00;
 143
 144         if ((a >= '0') && (a <= '9')) {
 145                 c = a - '0';
 146         } else if ((a >= 'A') && (a <= 'F')) {
 147                 c = (a - 'A') + 10;
 148         } else if ((a >= 'a') && (a <= 'f')) {
 149                 c = (a - 'a') + 10;
 150         }
 151
 152         return c;
 153 }
 154
 155 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 156 {
 157         uint8_t *buf_out = *outpos;
 158         uint8_t *outend = *outpos + outlen;
 159         uint8_t *inend = *inpos + inlen;
 160
 161         if (flags & FLAG_LENGTH_BYTE) {
 162                 int len = 0;
 163                 uint8_t *ip;
 164
 165                 ip = *inpos;
 166                 while(ip < inend) {
 167                         if (*ip == ',') {
 168                                 ip++;
 169                                 if (!(flags & FLAG_IGNORE_COMMAS))
 170                                         break;
 171
 172                                 continue;
 173                         }
 174                         len++;
 175                         ip++;
 176                 }
 177                 CHECK_SPACE(1);
 178                 **outpos = (len / 2);
 179                 *outpos += 1;
 180         }
 181
 182         while(*inpos < inend) {
 183                 if (**inpos == ',') {
 184                         *inpos += 1;
 185                         if (!(flags & FLAG_IGNORE_COMMAS))
 186                                 break;
 187
 188                         continue;
 189                 }
 190
 191                 CHECK_SPACE(1);
 192                 CHECK_AVAIL(2);
 193
 194                 **outpos = ascii_to_nibble(**inpos) << 4;
 195                 *inpos += 1;
 196                 **outpos |= ascii_to_nibble(**inpos);
 197                 *inpos += 1; *outpos += 1;
 198         }
 199
 200         return *outpos - buf_out;
 201 }
 202
 203 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 204 {
 205         uint8_t out[1024];
 206         uint8_t *outpos;
 207         uint8_t *inpos;
 208         int fd = *((int*)data);
 209         int w;
 210
 211         if (buf_len < 1)
 212                 return 1;
 213
 214         memset(out, 0, sizeof(out));
 215         outpos = out;
 216         inpos = buf;
 217
 218         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 219         switch(buf[0]) {
 220                 case 'H':
 221                         if (impersonate_hmlanif) {
 222                                 buf[5] = 'L';
 223                                 buf[6] = 'A';
 224                                 buf[7] = 'N';
 225                         }
 226                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 227                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 228                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 229                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 230                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 231                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 232                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 233
 234                         break;
 235                 case 'E':
 236                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 237                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 238                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 239                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 240                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 241                         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);
 242
 243                         break;
 244                 case 'R':
 245                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 246                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 247                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 248                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 249                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 250                         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);
 251
 252                         break;
 253                 case 'I':
 254                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 255                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 256                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 257                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 258
 259                         break;
 260                 default:
 261                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 262                         hexdump(buf, buf_len, "Unknown> ");
 263                         break;
 264         }
 265
 266         /* Queue packet until first respone to 'K' is received */
 267         if (wait_for_h && buf[0] != 'H') {
 268                 struct queued_rx **rxp = &qrx;
 269
 270                 while (*rxp)
 271                         rxp = &((*rxp)->next);
 272
 273                 *rxp = malloc(sizeof(struct queued_rx));
 274                 if (!*rxp) {
 275                         perror("malloc");
 276                         return 0;
 277                 }
 278
 279                 memset(*rxp, 0, sizeof(struct queued_rx));
 280                 (*rxp)->len = outpos-out;
 281                 (*rxp)->rx = malloc((*rxp)->len);
 282                 if (!(*rxp)->rx) {
 283                         perror("malloc");
 284                         return 0;
 285                 }
 286                 memset((*rxp)->rx, 0, (*rxp)->len);
 287                 memcpy((*rxp)->rx, out, (*rxp)->len);
 288
 289                 return 1;
 290         }
 291
 292         if (verbose) {
 293                 int i;
 294
 295                 print_timestamp(stdout);
 296                 printf("LAN < ");
 297                 for (i = 0; i < outpos-out-2; i++)
 298                         printf("%c", out[i]);
 299                 printf("\n");
 300         }
 301
 302         w = write(fd, out, outpos-out);
 303         if (w <= 0) {
 304                 perror("write");
 305                 return 0;
 306         }
 307
 308         /* Send all queued packets */
 309         if (wait_for_h) {
 310                 struct queued_rx *curr_rx = qrx;
 311                 struct queued_rx *last_rx;
 312
 313                 while (curr_rx) {
 314                         if (verbose) {
 315                                 int i;
 316
 317                                 print_timestamp(stdout);
 318                                 printf("LAN < ");
 319                                 for (i = 0; i < curr_rx->len-2; i++)
 320                                         printf("%c", curr_rx->rx[i]);
 321                                 printf("\n");
 322                         }
 323
 324                         w = write(fd, curr_rx->rx, curr_rx->len);
 325                         if (w <= 0) {
 326                                 perror("write");
 327                         }
 328                         last_rx = curr_rx;
 329                         curr_rx = curr_rx->next;
 330
 331                         free(last_rx->rx);
 332                         free(last_rx);
 333                 }
 334
 335                 qrx = NULL;
 336
 337                 wait_for_h = 0;
 338         }
 339
 340         return 1;
 341 }
 342
 343 static int hmlan_parse_in(int fd, void *data)
 344 {
 345         struct hmcfgusb_dev *dev = data;
 346         uint8_t buf[1025];
 347         uint8_t out[0x40]; //FIXME!!!
 348         uint8_t *outpos;
 349         uint8_t *inpos;
 350         int i;
 351         int last;
 352         int r;
 353
 354         memset(buf, 0, sizeof(buf));
 355
 356         r = read(fd, buf, sizeof(buf)-1);
 357         if (r > 0) {
 358                 uint8_t *inend = buf + r;
 359
 360                 inpos = buf;
 361
 362                 while (inpos < inend) {
 363                         uint8_t *instart = inpos;
 364
 365                         if ((*inpos == '\r') || (*inpos == '\n')) {
 366                                 inpos++;
 367                                 continue;
 368                         }
 369
 370                         outpos = out;
 371
 372                         last = inend - inpos;
 373
 374                         for (i = 0; i < last; i++) {
 375                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 376                                         last = i;
 377                                         break;
 378                                 }
 379                         }
 380
 381                         if (last == 0)
 382                                 continue;
 383
 384                         if (verbose) {
 385                                 print_timestamp(stdout);
 386                                 printf("LAN > ");
 387                                 for (i = 0; i < last; i++)
 388                                         printf("%c", instart[i]);
 389                                 printf("\n");
 390                         }
 391
 392                         memset(out, 0, sizeof(out));
 393                         *outpos++ = *inpos++;
 394
 395                         switch(*instart) {
 396                                 case 'S':
 397                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 398                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 399                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 400                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 401                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 402                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 403                                         break;
 404                                 case 'Y':
 405                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 406                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 407                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 408                                         break;
 409                                 default:
 410                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 411                                         break;
 412                         }
 413
 414                         hmcfgusb_send(dev, out, sizeof(out), 1);
 415                 }
 416         } else if (r < 0) {
 417                 if (errno != ECONNRESET)
 418                         perror("read");
 419                 return r;
 420         } else {
 421                 return 0;
 422         }
 423
 424         return 1;
 425 }
 426
 427 static int comm(int fd_in, int fd_out, int master_socket, int flags)
 428 {
 429         struct hmcfgusb_dev *dev;
 430         uint8_t out[0x40]; //FIXME!!!
 431         int quit = 0;
 432
 433         hmcfgusb_set_debug(debug);
 434
 435         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 436         if (!dev) {
 437                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 438                 return 0;
 439         }
 440
 441         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 442                 fprintf(stderr, "Can't add client to pollfd!\n");
 443                 hmcfgusb_close(dev);
 444                 return 0;
 445         }
 446
 447         if (master_socket >= 0) {
 448                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 449                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 450                         hmcfgusb_close(dev);
 451                         return 0;
 452                 }
 453         }
 454
 455         memset(out, 0, sizeof(out));
 456         out[0] = 'K';
 457         wait_for_h = 1;
 458         hmcfgusb_send_null_frame(dev, 1);
 459         hmcfgusb_send(dev, out, sizeof(out), 1);
 460
 461         while(!quit) {
 462                 int fd;
 463
 464                 fd = hmcfgusb_poll(dev, 1);     /* Wakeup device/bus at least once a second */
 465                 if (fd >= 0) {
 466                         if (fd == master_socket) {
 467                                 int client;
 468
 469                                 client = accept(master_socket, NULL, 0);
 470                                 if (client >= 0) {
 471                                         shutdown(client, SHUT_RDWR);
 472                                         close(client);
 473                                 }
 474                         } else {
 475                                 if (hmlan_parse_in(fd, dev) <= 0) {
 476                                         quit = 1;
 477                                 }
 478                         }
 479                 } else if (fd == -1) {
 480                         if (errno) {
 481                                 if (errno != ETIMEDOUT) {
 482                                         perror("hmcfgusb_poll");
 483                                         quit = 1;
 484                                 } else {
 485                                         /* periodically wakeup the device */
 486                                         hmcfgusb_send_null_frame(dev, 1);
 487                                         if (wait_for_h) {
 488                                                 memset(out, 0, sizeof(out));
 489                                                 out[0] = 'K';
 490                                                 hmcfgusb_send(dev, out, sizeof(out), 1);
 491                                         }
 492                                 }
 493                         }
 494                 }
 495         }
 496
 497         hmcfgusb_close(dev);
 498         return 1;
 499 }
 500
 501 void sigterm_handler(int sig)
 502 {
 503         if (unlink(PID_FILE) == -1)
 504                 perror("Can't remove PID file");
 505
 506         exit(EXIT_SUCCESS);
 507 }
 508
 509 #define FLAG_DAEMON     (1 << 0)
 510 #define FLAG_PID_FILE   (1 << 1)
 511
 512 static int socket_server(char *iface, int port, int flags)
 513 {
 514         struct sigaction sact;
 515         struct sockaddr_in sin;
 516         int sock;
 517         int n;
 518         pid_t pid;
 519
 520         if (flags & FLAG_DAEMON) {
 521                 FILE *pidfile = NULL;
 522
 523                 if (flags & FLAG_PID_FILE) {
 524                         int fd;
 525
 526                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 527                         if (fd == -1) {
 528                                 if (errno == EEXIST) {
 529                                         pid_t old_pid;
 530                                         pidfile = fopen(PID_FILE, "r");
 531                                         if (!pidfile) {
 532                                                 perror("PID file " PID_FILE " already exists, already running?");
 533                                                 exit(EXIT_FAILURE);
 534                                         }
 535
 536                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 537                                                 fclose(pidfile);
 538                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 539                                                 exit(EXIT_FAILURE);
 540                                         }
 541
 542                                         fclose(pidfile);
 543
 544                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 545                                         exit(EXIT_FAILURE);
 546                                 }
 547                                 perror("Can't create PID file " PID_FILE);
 548                                 exit(EXIT_FAILURE);
 549                         }
 550
 551                         pidfile = fdopen(fd, "w");
 552                         if (!pidfile) {
 553                                 perror("Can't reopen PID file fd");
 554                                 exit(EXIT_FAILURE);
 555                         }
 556
 557                         memset(&sact, 0, sizeof(sact));
 558                         sact.sa_handler = sigterm_handler;
 559
 560                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 561                                 perror("sigaction(SIGTERM)");
 562                                 exit(EXIT_FAILURE);
 563                         }
 564                 }
 565
 566                 pid = fork();
 567                 if (pid > 0) {
 568                         if (pidfile) {
 569                                 fprintf(pidfile, "%u\n", pid);
 570                                 fclose(pidfile);
 571                         }
 572
 573                         printf("Daemon with PID %u started!\n", pid);
 574                         exit(EXIT_SUCCESS);
 575                 } else if (pid < 0) {
 576                         perror("fork");
 577                         exit(EXIT_FAILURE);
 578                 }
 579
 580                 if (pidfile)
 581                         fclose(pidfile);
 582         }
 583
 584         memset(&sact, 0, sizeof(sact));
 585         sact.sa_handler = SIG_IGN;
 586
 587         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 588                 perror("sigaction(SIGPIPE)");
 589                 exit(EXIT_FAILURE);
 590         }
 591
 592         impersonate_hmlanif = 1;
 593
 594         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 595         if (sock == -1) {
 596                 perror("Can't open socket");
 597                 return EXIT_FAILURE;
 598         }
 599
 600         n = 1;
 601         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 602                 perror("Can't set socket options");
 603                 return EXIT_FAILURE;
 604         }
 605
 606         memset(&sin, 0, sizeof(sin));
 607         sin.sin_family = AF_INET;
 608         sin.sin_port = htons(port);
 609         if (!iface) {
 610                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 611         } else {
 612                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 613                         fprintf(stderr, "Can't convert IP %s, aborting!\n", iface);
 614                         return EXIT_FAILURE;
 615                 }
 616         }
 617
 618         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 619                 perror("Can't bind socket");
 620                 return EXIT_FAILURE;
 621         }
 622
 623         if (listen(sock, 1) == -1) {
 624                 perror("Can't listen on socket");
 625                 return EXIT_FAILURE;
 626         }
 627
 628         while(1) {
 629                 struct sockaddr_in csin;
 630                 socklen_t csinlen;
 631                 int client;
 632                 in_addr_t client_addr;
 633
 634                 memset(&csin, 0, sizeof(csin));
 635                 csinlen = sizeof(csin);
 636                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 637                 if (client == -1) {
 638                         perror("Couldn't accept client");
 639                         continue;
 640                 }
 641
 642                 /* FIXME: getnameinfo... */
 643                 client_addr = ntohl(csin.sin_addr.s_addr);
 644
 645                 if (verbose) {
 646                         print_timestamp(stdout);
 647                         printf("Client %d.%d.%d.%d connected!\n",
 648                                         (client_addr & 0xff000000) >> 24,
 649                                         (client_addr & 0x00ff0000) >> 16,
 650                                         (client_addr & 0x0000ff00) >> 8,
 651                                         (client_addr & 0x000000ff));
 652                 }
 653
 654                 comm(client, client, sock, flags);
 655
 656                 shutdown(client, SHUT_RDWR);
 657                 close(client);
 658
 659                 if (verbose) {
 660                         print_timestamp(stdout);
 661                         printf("Connection to %d.%d.%d.%d closed!\n",
 662                                         (client_addr & 0xff000000) >> 24,
 663                                         (client_addr & 0x00ff0000) >> 16,
 664                                         (client_addr & 0x0000ff00) >> 8,
 665                                         (client_addr & 0x000000ff));
 666                 }
 667                 sleep(1);
 668         }
 669
 670         return EXIT_SUCCESS;
 671 }
 672
 673 static int interactive_server(int flags)
 674 {
 675         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1, flags))
 676                 return EXIT_FAILURE;
 677
 678         return EXIT_SUCCESS;
 679 }
 680
 681 void hmlan_syntax(char *prog)
 682 {
 683         fprintf(stderr, "Syntax: %s options\n\n", prog);
 684         fprintf(stderr, "Possible options:\n");
 685         fprintf(stderr, "\t-D\tdebug mode\n");
 686         fprintf(stderr, "\t-d\tdaemon mode\n");
 687         fprintf(stderr, "\t-h\tthis help\n");
 688         fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 689         fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
 690         fprintf(stderr, "\t-P\tcreate PID file " PID_FILE " in daemon mode\n");
 691         fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
 692         fprintf(stderr, "\t-v\tverbose mode\n");
 693
 694 }
 695
 696 int main(int argc, char **argv)
 697 {
 698         int port = 1000;
 699         char *iface = NULL;
 700         int interactive = 0;
 701         int flags = 0;
 702         char *ep;
 703         int opt;
 704
 705         while((opt = getopt(argc, argv, "DdhiPp:Rl:v")) != -1) {
 706                 switch (opt) {
 707                         case 'D':
 708                                 debug = 1;
 709                                 verbose = 1;
 710                                 break;
 711                         case 'd':
 712                                 flags |= FLAG_DAEMON;
 713                                 break;
 714                         case 'i':
 715                                 interactive = 1;
 716                                 break;
 717                         case 'P':
 718                                 flags |= FLAG_PID_FILE;
 719                                 break;
 720                         case 'p':
 721                                 port = strtoul(optarg, &ep, 10);
 722                                 if (*ep != '\0') {
 723                                         fprintf(stderr, "Can't parse port!\n");
 724                                         exit(EXIT_FAILURE);
 725                                 }
 726                                 break;
 727                         case 'R':
 728                                 fprintf(stderr, "-R is no longer needed (1s wakeup is default)\n");
 729                                 break;
 730                         case 'l':
 731                                 iface = optarg;
 732                                 break;
 733                         case 'v':
 734                                 verbose = 1;
 735                                 break;
 736                         case 'h':
 737                         case ':':
 738                         case '?':
 739                         default:
 740                                 hmlan_syntax(argv[0]);
 741                                 exit(EXIT_FAILURE);
 742                                 break;
 743                 }
 744         }
 745
 746         if (interactive) {
 747                 return interactive_server(flags);
 748         } else {
 749                 return socket_server(iface, port, flags);
 750         }
 751 }