cvs.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 #define DEFAULT_REBOOT_SECONDS  86400
  48
  49 extern char *optarg;
  50
  51 static int impersonate_hmlanif = 0;
  52 static int debug = 0;
  53 static int verbose = 0;
  54 static int reboot_seconds = 0;
  55
  56 struct queued_rx {
  57         char *rx;
  58         int len;
  59         struct queued_rx *next;
  60 };
  61
  62 static struct queued_rx *qrx = NULL;
  63 static int wait_for_h = 0;
  64
  65 #define FLAG_LENGTH_BYTE        (1<<0)
  66 #define FLAG_FORMAT_HEX         (1<<1)
  67 #define FLAG_COMMA_BEFORE       (1<<2)
  68 #define FLAG_COMMA_AFTER        (1<<3)
  69 #define FLAG_NL                 (1<<4)
  70 #define FLAG_IGNORE_COMMAS      (1<<5)
  71
  72 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  73 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  74
  75 static void print_timestamp(FILE *f)
  76 {
  77         struct timeval tv;
  78         struct tm *tmp;
  79         char ts[32];
  80
  81         gettimeofday(&tv, NULL);
  82         tmp = localtime(&tv.tv_sec);
  83         memset(ts, 0, sizeof(ts));
  84         strftime(ts, sizeof(ts)-1, "%Y-%m-%d %H:%M:%S", tmp);
  85         fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
  86 }
  87
  88 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  89 {
  90         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  91                 'A', 'B', 'C', 'D', 'E', 'F'};
  92         uint8_t *buf_out = *outpos;
  93         uint8_t *outend = *outpos + outlen;
  94         uint8_t *inend = *inpos + inlen;
  95         int i;
  96
  97         if (flags & FLAG_COMMA_BEFORE) {
  98                 CHECK_SPACE(1);
  99                 **outpos=',';
 100                 *outpos += 1;
 101         }
 102
 103         if (flags & FLAG_LENGTH_BYTE) {
 104                 CHECK_AVAIL(1);
 105                 len = **inpos;
 106                 *inpos += 1;
 107         }
 108
 109         if (flags & FLAG_FORMAT_HEX) {
 110                 CHECK_AVAIL(len);
 111                 CHECK_SPACE(len*2);
 112                 for (i = 0; i < len; i++) {
 113                         **outpos = nibble[((**inpos) & 0xf0) >> 4];
 114                         *outpos += 1;
 115                         **outpos = nibble[((**inpos) & 0xf)];
 116                         *inpos += 1; *outpos += 1;
 117                 }
 118         } else {
 119                 CHECK_AVAIL(len);
 120                 CHECK_SPACE(len);
 121                 memcpy(*outpos, *inpos, len);
 122                 *outpos += len;
 123                 *inpos += len;
 124         }
 125
 126         if (flags & FLAG_COMMA_AFTER) {
 127                 CHECK_SPACE(1);
 128                 **outpos=',';
 129                 *outpos += 1;
 130         }
 131
 132         if (flags & FLAG_NL) {
 133                 CHECK_SPACE(2);
 134                 **outpos='\r';
 135                 *outpos += 1;
 136                 **outpos='\n';
 137                 *outpos += 1;
 138         }
 139
 140         return *outpos - buf_out;
 141 }
 142
 143 static uint8_t ascii_to_nibble(uint8_t a)
 144 {
 145         uint8_t c = 0x00;
 146
 147         if ((a >= '0') && (a <= '9')) {
 148                 c = a - '0';
 149         } else if ((a >= 'A') && (a <= 'F')) {
 150                 c = (a - 'A') + 10;
 151         } else if ((a >= 'a') && (a <= 'f')) {
 152                 c = (a - 'a') + 10;
 153         }
 154
 155         return c;
 156 }
 157
 158 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 159 {
 160         uint8_t *buf_out = *outpos;
 161         uint8_t *outend = *outpos + outlen;
 162         uint8_t *inend = *inpos + inlen;
 163
 164         if (flags & FLAG_LENGTH_BYTE) {
 165                 int len = 0;
 166                 uint8_t *ip;
 167
 168                 ip = *inpos;
 169                 while(ip < inend) {
 170                         if (*ip == ',') {
 171                                 ip++;
 172                                 if (!(flags & FLAG_IGNORE_COMMAS))
 173                                         break;
 174
 175                                 continue;
 176                         }
 177                         len++;
 178                         ip++;
 179                 }
 180                 CHECK_SPACE(1);
 181                 **outpos = (len / 2);
 182                 *outpos += 1;
 183         }
 184
 185         while(*inpos < inend) {
 186                 if (**inpos == ',') {
 187                         *inpos += 1;
 188                         if (!(flags & FLAG_IGNORE_COMMAS))
 189                                 break;
 190
 191                         continue;
 192                 }
 193
 194                 CHECK_SPACE(1);
 195                 CHECK_AVAIL(2);
 196
 197                 **outpos = ascii_to_nibble(**inpos) << 4;
 198                 *inpos += 1;
 199                 **outpos |= ascii_to_nibble(**inpos);
 200                 *inpos += 1; *outpos += 1;
 201         }
 202
 203         return *outpos - buf_out;
 204 }
 205
 206 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 207 {
 208         uint8_t out[1024];
 209         uint8_t *outpos;
 210         uint8_t *inpos;
 211         int fd = *((int*)data);
 212         int w;
 213
 214         if (buf_len < 1)
 215                 return 1;
 216
 217         memset(out, 0, sizeof(out));
 218         outpos = out;
 219         inpos = buf;
 220
 221         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 222         switch(buf[0]) {
 223                 case 'H':
 224                         if (impersonate_hmlanif) {
 225                                 buf[5] = 'L';
 226                                 buf[6] = 'A';
 227                                 buf[7] = 'N';
 228                         }
 229                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 230                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 231                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 232                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 233                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 234                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 235                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 236
 237                         break;
 238                 case 'E':
 239                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 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)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 242                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 243                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 244                         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);
 245
 246                         break;
 247                 case 'R':
 248                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 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)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 251                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 252                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 253                         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);
 254
 255                         break;
 256                 case 'I':
 257                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 258                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 259                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 260                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 261
 262                         break;
 263                 default:
 264                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 265                         hexdump(buf, buf_len, "Unknown> ");
 266                         break;
 267         }
 268
 269         /* Queue packet until first respone to 'K' is received */
 270         if (wait_for_h && buf[0] != 'H') {
 271                 struct queued_rx **rxp = &qrx;
 272
 273                 while (*rxp)
 274                         rxp = &((*rxp)->next);
 275
 276                 *rxp = malloc(sizeof(struct queued_rx));
 277                 if (!*rxp) {
 278                         perror("malloc");
 279                         return 0;
 280                 }
 281
 282                 memset(*rxp, 0, sizeof(struct queued_rx));
 283                 (*rxp)->len = outpos-out;
 284                 (*rxp)->rx = malloc((*rxp)->len);
 285                 if (!(*rxp)->rx) {
 286                         perror("malloc");
 287                         return 0;
 288                 }
 289                 memset((*rxp)->rx, 0, (*rxp)->len);
 290                 memcpy((*rxp)->rx, out, (*rxp)->len);
 291
 292                 return 1;
 293         }
 294
 295         if (verbose) {
 296                 int i;
 297
 298                 print_timestamp(stdout);
 299                 printf("LAN < ");
 300                 for (i = 0; i < outpos-out-2; i++)
 301                         printf("%c", out[i]);
 302                 printf("\n");
 303         }
 304
 305         w = write(fd, out, outpos-out);
 306         if (w <= 0) {
 307                 perror("write");
 308                 return 0;
 309         }
 310
 311         /* Send all queued packets */
 312         if (wait_for_h) {
 313                 struct queued_rx *curr_rx = qrx;
 314                 struct queued_rx *last_rx;
 315
 316                 while (curr_rx) {
 317                         if (verbose) {
 318                                 int i;
 319
 320                                 print_timestamp(stdout);
 321                                 printf("LAN < ");
 322                                 for (i = 0; i < curr_rx->len-2; i++)
 323                                         printf("%c", curr_rx->rx[i]);
 324                                 printf("\n");
 325                         }
 326
 327                         w = write(fd, curr_rx->rx, curr_rx->len);
 328                         if (w <= 0) {
 329                                 perror("write");
 330                         }
 331                         last_rx = curr_rx;
 332                         curr_rx = curr_rx->next;
 333
 334                         free(last_rx->rx);
 335                         free(last_rx);
 336                 }
 337
 338                 qrx = NULL;
 339
 340                 wait_for_h = 0;
 341         }
 342
 343         return 1;
 344 }
 345
 346 static int hmlan_parse_in(int fd, void *data)
 347 {
 348         struct hmcfgusb_dev *dev = data;
 349         uint8_t buf[1025];
 350         uint8_t out[0x40]; //FIXME!!!
 351         uint8_t *outpos;
 352         uint8_t *inpos;
 353         int i;
 354         int last;
 355         int r;
 356
 357         memset(buf, 0, sizeof(buf));
 358
 359         r = read(fd, buf, sizeof(buf)-1);
 360         if (r > 0) {
 361                 uint8_t *inend = buf + r;
 362
 363                 inpos = buf;
 364
 365                 while (inpos < inend) {
 366                         uint8_t *instart = inpos;
 367
 368                         if ((*inpos == '\r') || (*inpos == '\n')) {
 369                                 inpos++;
 370                                 continue;
 371                         }
 372
 373                         outpos = out;
 374
 375                         last = inend - inpos;
 376
 377                         for (i = 0; i < last; i++) {
 378                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 379                                         last = i;
 380                                         break;
 381                                 }
 382                         }
 383
 384                         if (last == 0)
 385                                 continue;
 386
 387                         if (verbose) {
 388                                 print_timestamp(stdout);
 389                                 printf("LAN > ");
 390                                 for (i = 0; i < last; i++)
 391                                         printf("%c", instart[i]);
 392                                 printf("\n");
 393                         }
 394
 395                         memset(out, 0, sizeof(out));
 396                         *outpos++ = *inpos++;
 397
 398                         switch(*instart) {
 399                                 case 'S':
 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)), 0);
 403                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 404                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 405                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 406                                         break;
 407                                 case 'Y':
 408                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 409                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 410                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 411                                         break;
 412                                 default:
 413                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 414                                         break;
 415                         }
 416
 417                         hmcfgusb_send(dev, out, sizeof(out), 1);
 418                 }
 419         } else if (r < 0) {
 420                 if (errno != ECONNRESET)
 421                         perror("read");
 422                 return r;
 423         } else {
 424                 return 0;
 425         }
 426
 427         return 1;
 428 }
 429
 430 static int comm(int fd_in, int fd_out, int master_socket, int flags)
 431 {
 432         struct hmcfgusb_dev *dev;
 433         uint8_t out[0x40]; //FIXME!!!
 434         int quit = 0;
 435
 436         hmcfgusb_set_debug(debug);
 437
 438         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 439         if (!dev) {
 440                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 441                 return 0;
 442         }
 443
 444         if (dev->bootloader) {
 445                 fprintf(stderr, "HM-CFG-USB in bootloader mode, restarting in normal mode...\n");
 446                 memset(out, 0, sizeof(out));
 447                 out[0] = 'K';
 448                 hmcfgusb_send(dev, out, sizeof(out), 1);
 449                 hmcfgusb_close(dev);
 450                 sleep(1);
 451                 return 0;
 452         }
 453
 454         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 455                 fprintf(stderr, "Can't add client to pollfd!\n");
 456                 hmcfgusb_close(dev);
 457                 return 0;
 458         }
 459
 460         if (master_socket >= 0) {
 461                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 462                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 463                         hmcfgusb_close(dev);
 464                         return 0;
 465                 }
 466         }
 467
 468         memset(out, 0, sizeof(out));
 469         out[0] = 'K';
 470         wait_for_h = 1;
 471         hmcfgusb_send_null_frame(dev, 1);
 472         hmcfgusb_send(dev, out, sizeof(out), 1);
 473
 474         while(!quit) {
 475                 int fd;
 476
 477                 fd = hmcfgusb_poll(dev, 1);     /* Wakeup device/bus at least once a second */
 478                 if (fd >= 0) {
 479                         if (fd == master_socket) {
 480                                 int client;
 481
 482                                 client = accept(master_socket, NULL, 0);
 483                                 if (client >= 0) {
 484                                         shutdown(client, SHUT_RDWR);
 485                                         close(client);
 486                                 }
 487                         } else {
 488                                 if (hmlan_parse_in(fd, dev) <= 0) {
 489                                         quit = 1;
 490                                 }
 491                         }
 492                 } else if (fd == -1) {
 493                         if (errno) {
 494                                 if (errno != ETIMEDOUT) {
 495                                         perror("hmcfgusb_poll");
 496                                         quit = 1;
 497                                 } else {
 498                                         /* periodically wakeup the device */
 499                                         hmcfgusb_send_null_frame(dev, 1);
 500                                         if (wait_for_h) {
 501                                                 memset(out, 0, sizeof(out));
 502                                                 out[0] = 'K';
 503                                                 hmcfgusb_send(dev, out, sizeof(out), 1);
 504                                         }
 505                                 }
 506                         }
 507                 }
 508
 509                 if (reboot_seconds && ((dev->opened_at + reboot_seconds) <= time(NULL))) {
 510                         if (verbose) {
 511                                 fprintf(stderr, "HM-CFG-USB running since %lu seconds, rebooting now...\n",
 512                                         time(NULL) - dev->opened_at);
 513                         }
 514                         hmcfgusb_enter_bootloader(dev);
 515                 }
 516         }
 517
 518         hmcfgusb_close(dev);
 519         return 1;
 520 }
 521
 522 void sigterm_handler(int sig)
 523 {
 524         if (unlink(PID_FILE) == -1)
 525                 perror("Can't remove PID file");
 526
 527         exit(EXIT_SUCCESS);
 528 }
 529
 530 #define FLAG_DAEMON     (1 << 0)
 531 #define FLAG_PID_FILE   (1 << 1)
 532
 533 static int socket_server(char *iface, int port, int flags)
 534 {
 535         struct sigaction sact;
 536         struct sockaddr_in sin;
 537         int sock;
 538         int n;
 539         pid_t pid;
 540
 541         if (flags & FLAG_DAEMON) {
 542                 FILE *pidfile = NULL;
 543
 544                 if (flags & FLAG_PID_FILE) {
 545                         int fd;
 546
 547                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 548                         if (fd == -1) {
 549                                 if (errno == EEXIST) {
 550                                         pid_t old_pid;
 551                                         pidfile = fopen(PID_FILE, "r");
 552                                         if (!pidfile) {
 553                                                 perror("PID file " PID_FILE " already exists, already running?");
 554                                                 exit(EXIT_FAILURE);
 555                                         }
 556
 557                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 558                                                 fclose(pidfile);
 559                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 560                                                 exit(EXIT_FAILURE);
 561                                         }
 562
 563                                         fclose(pidfile);
 564
 565                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 566                                         exit(EXIT_FAILURE);
 567                                 }
 568                                 perror("Can't create PID file " PID_FILE);
 569                                 exit(EXIT_FAILURE);
 570                         }
 571
 572                         pidfile = fdopen(fd, "w");
 573                         if (!pidfile) {
 574                                 perror("Can't reopen PID file fd");
 575                                 exit(EXIT_FAILURE);
 576                         }
 577
 578                         memset(&sact, 0, sizeof(sact));
 579                         sact.sa_handler = sigterm_handler;
 580
 581                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 582                                 perror("sigaction(SIGTERM)");
 583                                 exit(EXIT_FAILURE);
 584                         }
 585                 }
 586
 587                 pid = fork();
 588                 if (pid > 0) {
 589                         if (pidfile) {
 590                                 fprintf(pidfile, "%u\n", pid);
 591                                 fclose(pidfile);
 592                         }
 593
 594                         printf("Daemon with PID %u started!\n", pid);
 595                         exit(EXIT_SUCCESS);
 596                 } else if (pid < 0) {
 597                         perror("fork");
 598                         exit(EXIT_FAILURE);
 599                 }
 600
 601                 if (pidfile)
 602                         fclose(pidfile);
 603         }
 604
 605         memset(&sact, 0, sizeof(sact));
 606         sact.sa_handler = SIG_IGN;
 607
 608         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 609                 perror("sigaction(SIGPIPE)");
 610                 exit(EXIT_FAILURE);
 611         }
 612
 613         impersonate_hmlanif = 1;
 614
 615         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 616         if (sock == -1) {
 617                 perror("Can't open socket");
 618                 return EXIT_FAILURE;
 619         }
 620
 621         n = 1;
 622         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 623                 perror("Can't set socket options");
 624                 return EXIT_FAILURE;
 625         }
 626
 627         memset(&sin, 0, sizeof(sin));
 628         sin.sin_family = AF_INET;
 629         sin.sin_port = htons(port);
 630         if (!iface) {
 631                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 632         } else {
 633                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 634                         fprintf(stderr, "Can't convert IP %s, aborting!\n", iface);
 635                         return EXIT_FAILURE;
 636                 }
 637         }
 638
 639         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 640                 perror("Can't bind socket");
 641                 return EXIT_FAILURE;
 642         }
 643
 644         if (listen(sock, 1) == -1) {
 645                 perror("Can't listen on socket");
 646                 return EXIT_FAILURE;
 647         }
 648
 649         while(1) {
 650                 struct sockaddr_in csin;
 651                 socklen_t csinlen;
 652                 int client;
 653                 in_addr_t client_addr;
 654
 655                 memset(&csin, 0, sizeof(csin));
 656                 csinlen = sizeof(csin);
 657                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 658                 if (client == -1) {
 659                         perror("Couldn't accept client");
 660                         continue;
 661                 }
 662
 663                 /* FIXME: getnameinfo... */
 664                 client_addr = ntohl(csin.sin_addr.s_addr);
 665
 666                 if (verbose) {
 667                         print_timestamp(stdout);
 668                         printf("Client %d.%d.%d.%d connected!\n",
 669                                         (client_addr & 0xff000000) >> 24,
 670                                         (client_addr & 0x00ff0000) >> 16,
 671                                         (client_addr & 0x0000ff00) >> 8,
 672                                         (client_addr & 0x000000ff));
 673                 }
 674
 675                 comm(client, client, sock, flags);
 676
 677                 shutdown(client, SHUT_RDWR);
 678                 close(client);
 679
 680                 if (verbose) {
 681                         print_timestamp(stdout);
 682                         printf("Connection to %d.%d.%d.%d closed!\n",
 683                                         (client_addr & 0xff000000) >> 24,
 684                                         (client_addr & 0x00ff0000) >> 16,
 685                                         (client_addr & 0x0000ff00) >> 8,
 686                                         (client_addr & 0x000000ff));
 687                 }
 688                 sleep(1);
 689         }
 690
 691         return EXIT_SUCCESS;
 692 }
 693
 694 static int interactive_server(int flags)
 695 {
 696         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1, flags))
 697                 return EXIT_FAILURE;
 698
 699         return EXIT_SUCCESS;
 700 }
 701
 702 void hmlan_syntax(char *prog)
 703 {
 704         fprintf(stderr, "Syntax: %s options\n\n", prog);
 705         fprintf(stderr, "Possible options:\n");
 706         fprintf(stderr, "\t-D\tdebug mode\n");
 707         fprintf(stderr, "\t-d\tdaemon mode\n");
 708         fprintf(stderr, "\t-h\tthis help\n");
 709         fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 710         fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
 711         fprintf(stderr, "\t-P\tcreate PID file " PID_FILE " in daemon mode\n");
 712         fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
 713         fprintf(stderr, "\t-r n\treboot HM-CFG-USB after n seconds (0: no reboot, default: %u)\n", DEFAULT_REBOOT_SECONDS);
 714         fprintf(stderr, "\t-v\tverbose mode\n");
 715
 716 }
 717
 718 int main(int argc, char **argv)
 719 {
 720         int port = 1000;
 721         char *iface = NULL;
 722         int interactive = 0;
 723         int flags = 0;
 724         char *ep;
 725         int opt;
 726
 727         reboot_seconds = DEFAULT_REBOOT_SECONDS;
 728
 729         while((opt = getopt(argc, argv, "DdhiPp:Rr:l:v")) != -1) {
 730                 switch (opt) {
 731                         case 'D':
 732                                 debug = 1;
 733                                 verbose = 1;
 734                                 break;
 735                         case 'd':
 736                                 flags |= FLAG_DAEMON;
 737                                 break;
 738                         case 'i':
 739                                 interactive = 1;
 740                                 break;
 741                         case 'P':
 742                                 flags |= FLAG_PID_FILE;
 743                                 break;
 744                         case 'p':
 745                                 port = strtoul(optarg, &ep, 10);
 746                                 if (*ep != '\0') {
 747                                         fprintf(stderr, "Can't parse port!\n");
 748                                         exit(EXIT_FAILURE);
 749                                 }
 750                                 break;
 751                         case 'R':
 752                                 fprintf(stderr, "-R is no longer needed (1s wakeup is default)\n");
 753                                 break;
 754                         case 'r':
 755                                 reboot_seconds = strtoul(optarg, &ep, 10);
 756                                 if (*ep != '\0') {
 757                                         fprintf(stderr, "Can't parse reboot-timeout!\n");
 758                                         exit(EXIT_FAILURE);
 759                                 }
 760                                 break;
 761                         case 'l':
 762                                 iface = optarg;
 763                                 break;
 764                         case 'v':
 765                                 verbose = 1;
 766                                 break;
 767                         case 'h':
 768                         case ':':
 769                         case '?':
 770                         default:
 771                                 hmlan_syntax(argv[0]);
 772                                 exit(EXIT_FAILURE);
 773                                 break;
 774                 }
 775         }
 776
 777         if (interactive) {
 778                 return interactive_server(flags);
 779         } else {
 780                 return socket_server(iface, port, flags);
 781         }
 782 }