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 #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 static int reboot_at_hour = -1;
  56 static int reboot_at_minute = -1;
  57
  58 struct queued_rx {
  59         char *rx;
  60         int len;
  61         struct queued_rx *next;
  62 };
  63
  64 static struct queued_rx *qrx = NULL;
  65 static int wait_for_h = 0;
  66
  67 #define FLAG_LENGTH_BYTE        (1<<0)
  68 #define FLAG_FORMAT_HEX         (1<<1)
  69 #define FLAG_COMMA_BEFORE       (1<<2)
  70 #define FLAG_COMMA_AFTER        (1<<3)
  71 #define FLAG_NL                 (1<<4)
  72 #define FLAG_IGNORE_COMMAS      (1<<5)
  73
  74 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  75 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  76
  77 static void print_timestamp(FILE *f)
  78 {
  79         struct timeval tv;
  80         struct tm *tmp;
  81         char ts[32];
  82
  83         gettimeofday(&tv, NULL);
  84         tmp = localtime(&tv.tv_sec);
  85         memset(ts, 0, sizeof(ts));
  86         strftime(ts, sizeof(ts)-1, "%Y-%m-%d %H:%M:%S", tmp);
  87         fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
  88 }
  89
  90 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  91 {
  92         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  93                 'A', 'B', 'C', 'D', 'E', 'F'};
  94         uint8_t *buf_out = *outpos;
  95         uint8_t *outend = *outpos + outlen;
  96         uint8_t *inend = *inpos + inlen;
  97         int i;
  98
  99         if (flags & FLAG_COMMA_BEFORE) {
 100                 CHECK_SPACE(1);
 101                 **outpos=',';
 102                 *outpos += 1;
 103         }
 104
 105         if (flags & FLAG_LENGTH_BYTE) {
 106                 CHECK_AVAIL(1);
 107                 len = **inpos;
 108                 *inpos += 1;
 109         }
 110
 111         if (flags & FLAG_FORMAT_HEX) {
 112                 CHECK_AVAIL(len);
 113                 CHECK_SPACE(len*2);
 114                 for (i = 0; i < len; i++) {
 115                         **outpos = nibble[((**inpos) & 0xf0) >> 4];
 116                         *outpos += 1;
 117                         **outpos = nibble[((**inpos) & 0xf)];
 118                         *inpos += 1; *outpos += 1;
 119                 }
 120         } else {
 121                 CHECK_AVAIL(len);
 122                 CHECK_SPACE(len);
 123                 memcpy(*outpos, *inpos, len);
 124                 *outpos += len;
 125                 *inpos += len;
 126         }
 127
 128         if (flags & FLAG_COMMA_AFTER) {
 129                 CHECK_SPACE(1);
 130                 **outpos=',';
 131                 *outpos += 1;
 132         }
 133
 134         if (flags & FLAG_NL) {
 135                 CHECK_SPACE(2);
 136                 **outpos='\r';
 137                 *outpos += 1;
 138                 **outpos='\n';
 139                 *outpos += 1;
 140         }
 141
 142         return *outpos - buf_out;
 143 }
 144
 145 static uint8_t ascii_to_nibble(uint8_t a)
 146 {
 147         uint8_t c = 0x00;
 148
 149         if ((a >= '0') && (a <= '9')) {
 150                 c = a - '0';
 151         } else if ((a >= 'A') && (a <= 'F')) {
 152                 c = (a - 'A') + 10;
 153         } else if ((a >= 'a') && (a <= 'f')) {
 154                 c = (a - 'a') + 10;
 155         }
 156
 157         return c;
 158 }
 159
 160 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 161 {
 162         uint8_t *buf_out = *outpos;
 163         uint8_t *outend = *outpos + outlen;
 164         uint8_t *inend = *inpos + inlen;
 165
 166         if (flags & FLAG_LENGTH_BYTE) {
 167                 int len = 0;
 168                 uint8_t *ip;
 169
 170                 ip = *inpos;
 171                 while(ip < inend) {
 172                         if (*ip == ',') {
 173                                 ip++;
 174                                 if (!(flags & FLAG_IGNORE_COMMAS))
 175                                         break;
 176
 177                                 continue;
 178                         }
 179                         len++;
 180                         ip++;
 181                 }
 182                 CHECK_SPACE(1);
 183                 **outpos = (len / 2);
 184                 *outpos += 1;
 185         }
 186
 187         while(*inpos < inend) {
 188                 if (**inpos == ',') {
 189                         *inpos += 1;
 190                         if (!(flags & FLAG_IGNORE_COMMAS))
 191                                 break;
 192
 193                         continue;
 194                 }
 195
 196                 CHECK_SPACE(1);
 197                 CHECK_AVAIL(2);
 198
 199                 **outpos = ascii_to_nibble(**inpos) << 4;
 200                 *inpos += 1;
 201                 **outpos |= ascii_to_nibble(**inpos);
 202                 *inpos += 1; *outpos += 1;
 203         }
 204
 205         return *outpos - buf_out;
 206 }
 207
 208 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 209 {
 210         uint8_t out[1024];
 211         uint8_t *outpos;
 212         uint8_t *inpos;
 213         int fd = *((int*)data);
 214         int w;
 215
 216         if (buf_len < 1)
 217                 return 1;
 218
 219         memset(out, 0, sizeof(out));
 220         outpos = out;
 221         inpos = buf;
 222
 223         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 224         switch(buf[0]) {
 225                 case 'H':
 226                         if (impersonate_hmlanif) {
 227                                 buf[5] = 'L';
 228                                 buf[6] = 'A';
 229                                 buf[7] = 'N';
 230                         }
 231                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 232                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 233                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 234                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 235                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 236                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 237                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 238
 239                         break;
 240                 case 'E':
 241                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 242                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 243                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 244                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 245                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 246                         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);
 247
 248                         break;
 249                 case 'R':
 250                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 251                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 252                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 253                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 254                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 255                         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);
 256
 257                         break;
 258                 case 'I':
 259                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 260                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 261                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 262                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 263
 264                         break;
 265                 default:
 266                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 267                         hexdump(buf, buf_len, "Unknown> ");
 268                         break;
 269         }
 270
 271         /* Queue packet until first respone to 'K' is received */
 272         if (wait_for_h && buf[0] != 'H') {
 273                 struct queued_rx **rxp = &qrx;
 274
 275                 while (*rxp)
 276                         rxp = &((*rxp)->next);
 277
 278                 *rxp = malloc(sizeof(struct queued_rx));
 279                 if (!*rxp) {
 280                         perror("malloc");
 281                         return 0;
 282                 }
 283
 284                 memset(*rxp, 0, sizeof(struct queued_rx));
 285                 (*rxp)->len = outpos-out;
 286                 (*rxp)->rx = malloc((*rxp)->len);
 287                 if (!(*rxp)->rx) {
 288                         perror("malloc");
 289                         return 0;
 290                 }
 291                 memset((*rxp)->rx, 0, (*rxp)->len);
 292                 memcpy((*rxp)->rx, out, (*rxp)->len);
 293
 294                 return 1;
 295         }
 296
 297         if (verbose) {
 298                 int i;
 299
 300                 print_timestamp(stdout);
 301                 printf("LAN < ");
 302                 for (i = 0; i < outpos-out-2; i++)
 303                         printf("%c", out[i]);
 304                 printf("\n");
 305         }
 306
 307         w = write(fd, out, outpos-out);
 308         if (w <= 0) {
 309                 perror("write");
 310                 return 0;
 311         }
 312
 313         /* Send all queued packets */
 314         if (wait_for_h) {
 315                 struct queued_rx *curr_rx = qrx;
 316                 struct queued_rx *last_rx;
 317
 318                 while (curr_rx) {
 319                         if (verbose) {
 320                                 int i;
 321
 322                                 print_timestamp(stdout);
 323                                 printf("LAN < ");
 324                                 for (i = 0; i < curr_rx->len-2; i++)
 325                                         printf("%c", curr_rx->rx[i]);
 326                                 printf("\n");
 327                         }
 328
 329                         w = write(fd, curr_rx->rx, curr_rx->len);
 330                         if (w <= 0) {
 331                                 perror("write");
 332                         }
 333                         last_rx = curr_rx;
 334                         curr_rx = curr_rx->next;
 335
 336                         free(last_rx->rx);
 337                         free(last_rx);
 338                 }
 339
 340                 qrx = NULL;
 341
 342                 wait_for_h = 0;
 343         }
 344
 345         return 1;
 346 }
 347
 348 static int hmlan_parse_in(int fd, void *data)
 349 {
 350         struct hmcfgusb_dev *dev = data;
 351         uint8_t buf[1025];
 352         uint8_t out[0x40]; //FIXME!!!
 353         uint8_t *outpos;
 354         uint8_t *inpos;
 355         int i;
 356         int last;
 357         int r;
 358
 359         memset(buf, 0, sizeof(buf));
 360
 361         r = read(fd, buf, sizeof(buf)-1);
 362         if (r > 0) {
 363                 uint8_t *inend = buf + r;
 364
 365                 inpos = buf;
 366
 367                 while (inpos < inend) {
 368                         uint8_t *instart = inpos;
 369
 370                         if ((*inpos == '\r') || (*inpos == '\n')) {
 371                                 inpos++;
 372                                 continue;
 373                         }
 374
 375                         outpos = out;
 376
 377                         last = inend - inpos;
 378
 379                         for (i = 0; i < last; i++) {
 380                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 381                                         last = i;
 382                                         break;
 383                                 }
 384                         }
 385
 386                         if (last == 0)
 387                                 continue;
 388
 389                         if (verbose) {
 390                                 print_timestamp(stdout);
 391                                 printf("LAN > ");
 392                                 for (i = 0; i < last; i++)
 393                                         printf("%c", instart[i]);
 394                                 printf("\n");
 395                         }
 396
 397                         memset(out, 0, sizeof(out));
 398                         *outpos++ = *inpos++;
 399
 400                         switch(*instart) {
 401                                 case 'S':
 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)), 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                                 case 'Y':
 410                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 411                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 412                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 413                                         break;
 414                                 default:
 415                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 416                                         break;
 417                         }
 418
 419                         hmcfgusb_send(dev, out, sizeof(out), 1);
 420                 }
 421         } else if (r < 0) {
 422                 if (errno != ECONNRESET)
 423                         perror("read");
 424                 return r;
 425         } else {
 426                 return 0;
 427         }
 428
 429         return 1;
 430 }
 431
 432 static int comm(int fd_in, int fd_out, int master_socket, int flags)
 433 {
 434         struct hmcfgusb_dev *dev;
 435         uint8_t out[0x40]; //FIXME!!!
 436         int quit = 0;
 437
 438         hmcfgusb_set_debug(debug);
 439
 440         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 441         if (!dev) {
 442                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 443                 return 0;
 444         }
 445
 446         if (dev->bootloader) {
 447                 if (verbose)
 448                         printf("HM-CFG-USB in bootloader mode, restarting in normal mode...\n");
 449
 450                 hmcfgusb_leave_bootloader(dev);
 451
 452                 hmcfgusb_close(dev);
 453                 sleep(1);
 454                 return 0;
 455         }
 456
 457         if ((reboot_at_hour != -1) && (reboot_at_minute != -1)) {
 458                 struct tm *tm_s;
 459                 time_t tm;
 460
 461                 tm = time(NULL);
 462                 tm_s = localtime(&tm);
 463                 if (tm_s == NULL) {
 464                         perror("localtime");
 465                         return 0;
 466                 }
 467
 468                 if ((tm_s->tm_hour > reboot_at_hour) ||
 469                     ((tm_s->tm_hour == reboot_at_hour) && (tm_s->tm_min >= reboot_at_minute))) {
 470                         if (verbose)
 471                                 printf("Rebooting tomorrow at %02u:%02u\n", reboot_at_hour, reboot_at_minute);
 472
 473                         tm = 86400;
 474                 } else {
 475                         if (verbose)
 476                                 printf("Rebooting today at %02u:%02u\n", reboot_at_hour, reboot_at_minute);
 477
 478                         tm = 0;
 479                 }
 480
 481                 tm_s->tm_hour = reboot_at_hour;
 482                 tm_s->tm_min = reboot_at_minute;
 483                 tm_s->tm_sec = 0;
 484
 485                 tm += mktime(tm_s);
 486                 reboot_seconds = tm - dev->opened_at;
 487         }
 488
 489         if (verbose && reboot_seconds)
 490                 printf("Rebooting in %u seconds\n", reboot_seconds);
 491
 492
 493         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 494                 fprintf(stderr, "Can't add client to pollfd!\n");
 495                 hmcfgusb_close(dev);
 496                 return 0;
 497         }
 498
 499         if (master_socket >= 0) {
 500                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 501                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 502                         hmcfgusb_close(dev);
 503                         return 0;
 504                 }
 505         }
 506
 507         memset(out, 0, sizeof(out));
 508         out[0] = 'K';
 509         wait_for_h = 1;
 510         hmcfgusb_send_null_frame(dev, 1);
 511         hmcfgusb_send(dev, out, sizeof(out), 1);
 512
 513         while(!quit) {
 514                 int fd;
 515
 516                 fd = hmcfgusb_poll(dev, 1);     /* Wakeup device/bus at least once a second */
 517                 if (fd >= 0) {
 518                         if (fd == master_socket) {
 519                                 int client;
 520
 521                                 client = accept(master_socket, NULL, 0);
 522                                 if (client >= 0) {
 523                                         shutdown(client, SHUT_RDWR);
 524                                         close(client);
 525                                 }
 526                         } else {
 527                                 if (hmlan_parse_in(fd, dev) <= 0) {
 528                                         quit = 1;
 529                                 }
 530                         }
 531                 } else if (fd == -1) {
 532                         if (errno) {
 533                                 if (errno != ETIMEDOUT) {
 534                                         perror("hmcfgusb_poll");
 535                                         quit = 1;
 536                                 } else {
 537                                         /* periodically wakeup the device */
 538                                         hmcfgusb_send_null_frame(dev, 1);
 539                                         if (wait_for_h) {
 540                                                 memset(out, 0, sizeof(out));
 541                                                 out[0] = 'K';
 542                                                 hmcfgusb_send(dev, out, sizeof(out), 1);
 543                                         }
 544                                 }
 545                         }
 546                 }
 547
 548                 if (reboot_seconds && ((dev->opened_at + reboot_seconds) <= time(NULL))) {
 549                         if (verbose) {
 550                                 printf("HM-CFG-USB running since %lu seconds, rebooting now...\n",
 551                                         time(NULL) - dev->opened_at);
 552                         }
 553                         hmcfgusb_enter_bootloader(dev);
 554                 }
 555         }
 556
 557         hmcfgusb_close(dev);
 558         return 1;
 559 }
 560
 561 void sigterm_handler(int sig)
 562 {
 563         if (unlink(PID_FILE) == -1)
 564                 perror("Can't remove PID file");
 565
 566         exit(EXIT_SUCCESS);
 567 }
 568
 569 #define FLAG_DAEMON     (1 << 0)
 570 #define FLAG_PID_FILE   (1 << 1)
 571
 572 static int socket_server(char *iface, int port, int flags)
 573 {
 574         struct sigaction sact;
 575         struct sockaddr_in sin;
 576         int sock;
 577         int n;
 578         pid_t pid;
 579
 580         if (flags & FLAG_DAEMON) {
 581                 FILE *pidfile = NULL;
 582
 583                 if (flags & FLAG_PID_FILE) {
 584                         int fd;
 585
 586                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 587                         if (fd == -1) {
 588                                 if (errno == EEXIST) {
 589                                         pid_t old_pid;
 590                                         pidfile = fopen(PID_FILE, "r");
 591                                         if (!pidfile) {
 592                                                 perror("PID file " PID_FILE " already exists, already running?");
 593                                                 exit(EXIT_FAILURE);
 594                                         }
 595
 596                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 597                                                 fclose(pidfile);
 598                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 599                                                 exit(EXIT_FAILURE);
 600                                         }
 601
 602                                         fclose(pidfile);
 603
 604                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 605                                         exit(EXIT_FAILURE);
 606                                 }
 607                                 perror("Can't create PID file " PID_FILE);
 608                                 exit(EXIT_FAILURE);
 609                         }
 610
 611                         pidfile = fdopen(fd, "w");
 612                         if (!pidfile) {
 613                                 perror("Can't reopen PID file fd");
 614                                 exit(EXIT_FAILURE);
 615                         }
 616
 617                         memset(&sact, 0, sizeof(sact));
 618                         sact.sa_handler = sigterm_handler;
 619
 620                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 621                                 perror("sigaction(SIGTERM)");
 622                                 exit(EXIT_FAILURE);
 623                         }
 624                 }
 625
 626                 pid = fork();
 627                 if (pid > 0) {
 628                         if (pidfile) {
 629                                 fprintf(pidfile, "%u\n", pid);
 630                                 fclose(pidfile);
 631                         }
 632
 633                         printf("Daemon with PID %u started!\n", pid);
 634                         exit(EXIT_SUCCESS);
 635                 } else if (pid < 0) {
 636                         perror("fork");
 637                         exit(EXIT_FAILURE);
 638                 }
 639
 640                 if (pidfile)
 641                         fclose(pidfile);
 642         }
 643
 644         memset(&sact, 0, sizeof(sact));
 645         sact.sa_handler = SIG_IGN;
 646
 647         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 648                 perror("sigaction(SIGPIPE)");
 649                 exit(EXIT_FAILURE);
 650         }
 651
 652         impersonate_hmlanif = 1;
 653
 654         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 655         if (sock == -1) {
 656                 perror("Can't open socket");
 657                 return EXIT_FAILURE;
 658         }
 659
 660         n = 1;
 661         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 662                 perror("Can't set socket options");
 663                 return EXIT_FAILURE;
 664         }
 665
 666         memset(&sin, 0, sizeof(sin));
 667         sin.sin_family = AF_INET;
 668         sin.sin_port = htons(port);
 669         if (!iface) {
 670                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 671         } else {
 672                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 673                         fprintf(stderr, "Can't convert IP %s, aborting!\n", iface);
 674                         return EXIT_FAILURE;
 675                 }
 676         }
 677
 678         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 679                 perror("Can't bind socket");
 680                 return EXIT_FAILURE;
 681         }
 682
 683         if (listen(sock, 1) == -1) {
 684                 perror("Can't listen on socket");
 685                 return EXIT_FAILURE;
 686         }
 687
 688         while(1) {
 689                 struct sockaddr_in csin;
 690                 socklen_t csinlen;
 691                 int client;
 692                 in_addr_t client_addr;
 693
 694                 memset(&csin, 0, sizeof(csin));
 695                 csinlen = sizeof(csin);
 696                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 697                 if (client == -1) {
 698                         perror("Couldn't accept client");
 699                         continue;
 700                 }
 701
 702                 /* FIXME: getnameinfo... */
 703                 client_addr = ntohl(csin.sin_addr.s_addr);
 704
 705                 if (verbose) {
 706                         print_timestamp(stdout);
 707                         printf("Client %d.%d.%d.%d connected!\n",
 708                                         (client_addr & 0xff000000) >> 24,
 709                                         (client_addr & 0x00ff0000) >> 16,
 710                                         (client_addr & 0x0000ff00) >> 8,
 711                                         (client_addr & 0x000000ff));
 712                 }
 713
 714                 comm(client, client, sock, flags);
 715
 716                 shutdown(client, SHUT_RDWR);
 717                 close(client);
 718
 719                 if (verbose) {
 720                         print_timestamp(stdout);
 721                         printf("Connection to %d.%d.%d.%d closed!\n",
 722                                         (client_addr & 0xff000000) >> 24,
 723                                         (client_addr & 0x00ff0000) >> 16,
 724                                         (client_addr & 0x0000ff00) >> 8,
 725                                         (client_addr & 0x000000ff));
 726                 }
 727                 sleep(1);
 728         }
 729
 730         return EXIT_SUCCESS;
 731 }
 732
 733 static int interactive_server(int flags)
 734 {
 735         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1, flags))
 736                 return EXIT_FAILURE;
 737
 738         return EXIT_SUCCESS;
 739 }
 740
 741 void hmlan_syntax(char *prog)
 742 {
 743         fprintf(stderr, "Syntax: %s options\n\n", prog);
 744         fprintf(stderr, "Possible options:\n");
 745         fprintf(stderr, "\t-D\t\tdebug mode\n");
 746         fprintf(stderr, "\t-d\t\tdaemon mode\n");
 747         fprintf(stderr, "\t-h\t\tthis help\n");
 748         fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 749         fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
 750         fprintf(stderr, "\t-P\t\tcreate PID file " PID_FILE " in daemon mode\n");
 751         fprintf(stderr, "\t-p n\t\tlisten on port n (default: 1000)\n");
 752         fprintf(stderr, "\t-r n\t\treboot HM-CFG-USB after n seconds (0: no reboot, default: %u)\n", DEFAULT_REBOOT_SECONDS);
 753         fprintf(stderr, "\t   hh:mm\treboot HM-CFG-USB daily at hh:mm\n");
 754         fprintf(stderr, "\t-v\t\tverbose mode\n");
 755
 756 }
 757
 758 int main(int argc, char **argv)
 759 {
 760         int port = 1000;
 761         char *iface = NULL;
 762         int interactive = 0;
 763         int flags = 0;
 764         char *ep;
 765         int opt;
 766
 767         reboot_seconds = DEFAULT_REBOOT_SECONDS;
 768
 769         while((opt = getopt(argc, argv, "DdhiPp:Rr:l:v")) != -1) {
 770                 switch (opt) {
 771                         case 'D':
 772                                 debug = 1;
 773                                 verbose = 1;
 774                                 break;
 775                         case 'd':
 776                                 flags |= FLAG_DAEMON;
 777                                 break;
 778                         case 'i':
 779                                 interactive = 1;
 780                                 break;
 781                         case 'P':
 782                                 flags |= FLAG_PID_FILE;
 783                                 break;
 784                         case 'p':
 785                                 port = strtoul(optarg, &ep, 10);
 786                                 if (*ep != '\0') {
 787                                         fprintf(stderr, "Can't parse port!\n");
 788                                         exit(EXIT_FAILURE);
 789                                 }
 790                                 break;
 791                         case 'R':
 792                                 fprintf(stderr, "-R is no longer needed (1s wakeup is default)\n");
 793                                 break;
 794                         case 'r':
 795                                 reboot_seconds = strtoul(optarg, &ep, 10);
 796                                 if (*ep != '\0') {
 797                                         if (*ep == ':') {
 798                                                 reboot_at_hour = reboot_seconds;
 799                                                 ep++;
 800                                                 reboot_at_minute = strtoul(ep, &ep, 10);
 801                                                 if (*ep != '\0') {
 802                                                         fprintf(stderr, "Can't parse reboot-time!\n");
 803                                                         exit(EXIT_FAILURE);
 804                                                 }
 805
 806                                                 reboot_seconds = 0;
 807                                         } else {
 808                                                 fprintf(stderr, "Can't parse reboot-timeout!\n");
 809                                                 exit(EXIT_FAILURE);
 810                                         }
 811                                 }
 812                                 break;
 813                         case 'l':
 814                                 iface = optarg;
 815                                 break;
 816                         case 'v':
 817                                 verbose = 1;
 818                                 break;
 819                         case 'h':
 820                         case ':':
 821                         case '?':
 822                         default:
 823                                 hmlan_syntax(argv[0]);
 824                                 exit(EXIT_FAILURE);
 825                                 break;
 826                 }
 827         }
 828
 829         if (interactive) {
 830                 return interactive_server(flags);
 831         } else {
 832                 return socket_server(iface, port, flags);
 833         }
 834 }