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 "version.h"
  43 #include "hexdump.h"
  44 #include "hmcfgusb.h"
  45
  46 #define PID_FILE "/var/run/hmland.pid"
  47
  48 #define DEFAULT_REBOOT_SECONDS  86400
  49
  50 extern char *optarg;
  51
  52 static int impersonate_hmlanif = 0;
  53 static int debug = 0;
  54 static int verbose = 0;
  55 static int reboot_seconds = 0;
  56 static int reboot_at_hour = -1;
  57 static int reboot_at_minute = -1;
  58
  59 struct queued_rx {
  60         char *rx;
  61         int len;
  62         struct queued_rx *next;
  63 };
  64
  65 static struct queued_rx *qrx = NULL;
  66 static int wait_for_h = 0;
  67
  68 #define FLAG_LENGTH_BYTE        (1<<0)
  69 #define FLAG_FORMAT_HEX         (1<<1)
  70 #define FLAG_COMMA_BEFORE       (1<<2)
  71 #define FLAG_COMMA_AFTER        (1<<3)
  72 #define FLAG_NL                 (1<<4)
  73 #define FLAG_IGNORE_COMMAS      (1<<5)
  74
  75 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  76 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  77
  78 static void print_timestamp(FILE *f)
  79 {
  80         struct timeval tv;
  81         struct tm *tmp;
  82         char ts[32];
  83
  84         gettimeofday(&tv, NULL);
  85         tmp = localtime(&tv.tv_sec);
  86         memset(ts, 0, sizeof(ts));
  87         strftime(ts, sizeof(ts)-1, "%Y-%m-%d %H:%M:%S", tmp);
  88         fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
  89 }
  90
  91 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  92 {
  93         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  94                 'A', 'B', 'C', 'D', 'E', 'F'};
  95         uint8_t *buf_out = *outpos;
  96         uint8_t *outend = *outpos + outlen;
  97         uint8_t *inend = *inpos + inlen;
  98         int i;
  99
 100         if (flags & FLAG_COMMA_BEFORE) {
 101                 CHECK_SPACE(1);
 102                 **outpos=',';
 103                 *outpos += 1;
 104         }
 105
 106         if (flags & FLAG_LENGTH_BYTE) {
 107                 CHECK_AVAIL(1);
 108                 len = **inpos;
 109                 *inpos += 1;
 110         }
 111
 112         if (flags & FLAG_FORMAT_HEX) {
 113                 CHECK_AVAIL(len);
 114                 CHECK_SPACE(len*2);
 115                 for (i = 0; i < len; i++) {
 116                         **outpos = nibble[((**inpos) & 0xf0) >> 4];
 117                         *outpos += 1;
 118                         **outpos = nibble[((**inpos) & 0xf)];
 119                         *inpos += 1; *outpos += 1;
 120                 }
 121         } else {
 122                 CHECK_AVAIL(len);
 123                 CHECK_SPACE(len);
 124                 memcpy(*outpos, *inpos, len);
 125                 *outpos += len;
 126                 *inpos += len;
 127         }
 128
 129         if (flags & FLAG_COMMA_AFTER) {
 130                 CHECK_SPACE(1);
 131                 **outpos=',';
 132                 *outpos += 1;
 133         }
 134
 135         if (flags & FLAG_NL) {
 136                 CHECK_SPACE(2);
 137                 **outpos='\r';
 138                 *outpos += 1;
 139                 **outpos='\n';
 140                 *outpos += 1;
 141         }
 142
 143         return *outpos - buf_out;
 144 }
 145
 146 static uint8_t ascii_to_nibble(uint8_t a)
 147 {
 148         uint8_t c = 0x00;
 149
 150         if ((a >= '0') && (a <= '9')) {
 151                 c = a - '0';
 152         } else if ((a >= 'A') && (a <= 'F')) {
 153                 c = (a - 'A') + 10;
 154         } else if ((a >= 'a') && (a <= 'f')) {
 155                 c = (a - 'a') + 10;
 156         }
 157
 158         return c;
 159 }
 160
 161 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 162 {
 163         uint8_t *buf_out = *outpos;
 164         uint8_t *outend = *outpos + outlen;
 165         uint8_t *inend = *inpos + inlen;
 166
 167         if (flags & FLAG_LENGTH_BYTE) {
 168                 int len = 0;
 169                 uint8_t *ip;
 170
 171                 ip = *inpos;
 172                 while(ip < inend) {
 173                         if (*ip == ',') {
 174                                 ip++;
 175                                 if (!(flags & FLAG_IGNORE_COMMAS))
 176                                         break;
 177
 178                                 continue;
 179                         }
 180                         len++;
 181                         ip++;
 182                 }
 183                 CHECK_SPACE(1);
 184                 **outpos = (len / 2);
 185                 *outpos += 1;
 186         }
 187
 188         while(*inpos < inend) {
 189                 if (**inpos == ',') {
 190                         *inpos += 1;
 191                         if (!(flags & FLAG_IGNORE_COMMAS))
 192                                 break;
 193
 194                         continue;
 195                 }
 196
 197                 CHECK_SPACE(1);
 198                 CHECK_AVAIL(2);
 199
 200                 **outpos = ascii_to_nibble(**inpos) << 4;
 201                 *inpos += 1;
 202                 **outpos |= ascii_to_nibble(**inpos);
 203                 *inpos += 1; *outpos += 1;
 204         }
 205
 206         return *outpos - buf_out;
 207 }
 208
 209 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 210 {
 211         uint8_t out[1024];
 212         uint8_t *outpos;
 213         uint8_t *inpos;
 214         int fd = *((int*)data);
 215         int w;
 216
 217         if (buf_len < 1)
 218                 return 1;
 219
 220         memset(out, 0, sizeof(out));
 221         outpos = out;
 222         inpos = buf;
 223
 224         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 225         switch(buf[0]) {
 226                 case 'H':
 227                         if (impersonate_hmlanif) {
 228                                 buf[5] = 'L';
 229                                 buf[6] = 'A';
 230                                 buf[7] = 'N';
 231                         }
 232                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 233                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 234                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 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)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 237                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 238                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 239
 240                         break;
 241                 case 'E':
 242                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 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)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 245                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 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)), 0, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE | FLAG_NL);
 248
 249                         break;
 250                 case 'R':
 251                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 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)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 254                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 255                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 256                         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);
 257
 258                         break;
 259                 case 'I':
 260                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 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);
 263                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 264
 265                         break;
 266                 default:
 267                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 268                         hexdump(buf, buf_len, "Unknown> ");
 269                         break;
 270         }
 271
 272         /* Queue packet until first respone to 'K' is received */
 273         if (wait_for_h && buf[0] != 'H') {
 274                 struct queued_rx **rxp = &qrx;
 275
 276                 while (*rxp)
 277                         rxp = &((*rxp)->next);
 278
 279                 *rxp = malloc(sizeof(struct queued_rx));
 280                 if (!*rxp) {
 281                         perror("malloc");
 282                         return 0;
 283                 }
 284
 285                 memset(*rxp, 0, sizeof(struct queued_rx));
 286                 (*rxp)->len = outpos-out;
 287                 (*rxp)->rx = malloc((*rxp)->len);
 288                 if (!(*rxp)->rx) {
 289                         perror("malloc");
 290                         return 0;
 291                 }
 292                 memset((*rxp)->rx, 0, (*rxp)->len);
 293                 memcpy((*rxp)->rx, out, (*rxp)->len);
 294
 295                 return 1;
 296         }
 297
 298         if (verbose) {
 299                 int i;
 300
 301                 print_timestamp(stdout);
 302                 printf("LAN < ");
 303                 for (i = 0; i < outpos-out-2; i++)
 304                         printf("%c", out[i]);
 305                 printf("\n");
 306         }
 307
 308         w = write(fd, out, outpos-out);
 309         if (w <= 0) {
 310                 perror("write");
 311                 return 0;
 312         }
 313
 314         /* Send all queued packets */
 315         if (wait_for_h) {
 316                 struct queued_rx *curr_rx = qrx;
 317                 struct queued_rx *last_rx;
 318
 319                 while (curr_rx) {
 320                         if (verbose) {
 321                                 int i;
 322
 323                                 print_timestamp(stdout);
 324                                 printf("LAN < ");
 325                                 for (i = 0; i < curr_rx->len-2; i++)
 326                                         printf("%c", curr_rx->rx[i]);
 327                                 printf("\n");
 328                         }
 329
 330                         w = write(fd, curr_rx->rx, curr_rx->len);
 331                         if (w <= 0) {
 332                                 perror("write");
 333                         }
 334                         last_rx = curr_rx;
 335                         curr_rx = curr_rx->next;
 336
 337                         free(last_rx->rx);
 338                         free(last_rx);
 339                 }
 340
 341                 qrx = NULL;
 342
 343                 wait_for_h = 0;
 344         }
 345
 346         return 1;
 347 }
 348
 349 static int hmlan_parse_in(int fd, void *data)
 350 {
 351         struct hmcfgusb_dev *dev = data;
 352         uint8_t buf[1025];
 353         uint8_t out[0x40]; //FIXME!!!
 354         uint8_t *outpos;
 355         uint8_t *inpos;
 356         int i;
 357         int last;
 358         int r;
 359
 360         memset(buf, 0, sizeof(buf));
 361
 362         r = read(fd, buf, sizeof(buf)-1);
 363         if (r > 0) {
 364                 uint8_t *inend = buf + r;
 365
 366                 inpos = buf;
 367
 368                 while (inpos < inend) {
 369                         uint8_t *instart = inpos;
 370
 371                         if ((*inpos == '\r') || (*inpos == '\n')) {
 372                                 inpos++;
 373                                 continue;
 374                         }
 375
 376                         outpos = out;
 377
 378                         last = inend - inpos;
 379
 380                         for (i = 0; i < last; i++) {
 381                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 382                                         last = i;
 383                                         break;
 384                                 }
 385                         }
 386
 387                         if (last == 0)
 388                                 continue;
 389
 390                         if (verbose) {
 391                                 print_timestamp(stdout);
 392                                 printf("LAN > ");
 393                                 for (i = 0; i < last; i++)
 394                                         printf("%c", instart[i]);
 395                                 printf("\n");
 396                         }
 397
 398                         memset(out, 0, sizeof(out));
 399                         *outpos++ = *inpos++;
 400
 401                         switch(*instart) {
 402                                 case 'S':
 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)), 0);
 408                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 409                                         break;
 410                                 case 'Y':
 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)), 0);
 413                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 414                                         break;
 415                                 default:
 416                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 417                                         break;
 418                         }
 419
 420                         hmcfgusb_send(dev, out, sizeof(out), 1);
 421                 }
 422         } else if (r < 0) {
 423                 if (errno != ECONNRESET)
 424                         perror("read");
 425                 return r;
 426         } else {
 427                 return 0;
 428         }
 429
 430         return 1;
 431 }
 432
 433 static int comm(int fd_in, int fd_out, int master_socket, int flags)
 434 {
 435         struct hmcfgusb_dev *dev;
 436         uint8_t out[0x40]; //FIXME!!!
 437         int quit = 0;
 438
 439         hmcfgusb_set_debug(debug);
 440
 441         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 442         if (!dev) {
 443                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 444                 return 0;
 445         }
 446
 447         if (dev->bootloader) {
 448                 if (verbose)
 449                         printf("HM-CFG-USB in bootloader mode, restarting in normal mode...\n");
 450
 451                 hmcfgusb_leave_bootloader(dev);
 452
 453                 hmcfgusb_close(dev);
 454                 sleep(1);
 455                 return 0;
 456         }
 457
 458         if ((reboot_at_hour != -1) && (reboot_at_minute != -1)) {
 459                 struct tm *tm_s;
 460                 time_t tm;
 461
 462                 tm = time(NULL);
 463                 tm_s = localtime(&tm);
 464                 if (tm_s == NULL) {
 465                         perror("localtime");
 466                         return 0;
 467                 }
 468
 469                 tm_s->tm_hour = reboot_at_hour;
 470                 tm_s->tm_min = reboot_at_minute;
 471                 tm_s->tm_sec = 0;
 472
 473                 tm = mktime(tm_s);
 474                 reboot_seconds = tm - dev->opened_at;
 475
 476                 while (reboot_seconds <= 0)
 477                         reboot_seconds += 86400;
 478         }
 479
 480         if (verbose && reboot_seconds)
 481                 printf("Rebooting in %u seconds\n", reboot_seconds);
 482
 483
 484         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 485                 fprintf(stderr, "Can't add client to pollfd!\n");
 486                 hmcfgusb_close(dev);
 487                 return 0;
 488         }
 489
 490         if (master_socket >= 0) {
 491                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 492                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 493                         hmcfgusb_close(dev);
 494                         return 0;
 495                 }
 496         }
 497
 498         memset(out, 0, sizeof(out));
 499         out[0] = 'K';
 500         wait_for_h = 1;
 501         hmcfgusb_send_null_frame(dev, 1);
 502         hmcfgusb_send(dev, out, sizeof(out), 1);
 503
 504         while(!quit) {
 505                 int fd;
 506
 507                 fd = hmcfgusb_poll(dev, 1);     /* Wakeup device/bus at least once a second */
 508                 if (fd >= 0) {
 509                         if (fd == master_socket) {
 510                                 int client;
 511
 512                                 client = accept(master_socket, NULL, 0);
 513                                 if (client >= 0) {
 514                                         shutdown(client, SHUT_RDWR);
 515                                         close(client);
 516                                 }
 517                         } else {
 518                                 if (hmlan_parse_in(fd, dev) <= 0) {
 519                                         quit = 1;
 520                                 }
 521                         }
 522                 } else if (fd == -1) {
 523                         if (errno) {
 524                                 if (errno != ETIMEDOUT) {
 525                                         perror("hmcfgusb_poll");
 526                                         quit = 1;
 527                                 } else {
 528                                         /* periodically wakeup the device */
 529                                         hmcfgusb_send_null_frame(dev, 1);
 530                                         if (wait_for_h) {
 531                                                 memset(out, 0, sizeof(out));
 532                                                 out[0] = 'K';
 533                                                 hmcfgusb_send(dev, out, sizeof(out), 1);
 534                                         }
 535                                 }
 536                         }
 537                 }
 538
 539                 if (reboot_seconds && ((dev->opened_at + reboot_seconds) <= time(NULL))) {
 540                         if (verbose) {
 541                                 printf("HM-CFG-USB running since %lu seconds, rebooting now...\n",
 542                                         time(NULL) - dev->opened_at);
 543                         }
 544                         hmcfgusb_enter_bootloader(dev);
 545                 }
 546         }
 547
 548         hmcfgusb_close(dev);
 549         return 1;
 550 }
 551
 552 void sigterm_handler(int sig)
 553 {
 554         if (unlink(PID_FILE) == -1)
 555                 perror("Can't remove PID file");
 556
 557         exit(EXIT_SUCCESS);
 558 }
 559
 560 #define FLAG_DAEMON     (1 << 0)
 561 #define FLAG_PID_FILE   (1 << 1)
 562
 563 static int socket_server(char *iface, int port, int flags)
 564 {
 565         struct sigaction sact;
 566         struct sockaddr_in sin;
 567         int sock;
 568         int n;
 569         pid_t pid;
 570
 571         if (flags & FLAG_DAEMON) {
 572                 FILE *pidfile = NULL;
 573
 574                 if (flags & FLAG_PID_FILE) {
 575                         int fd;
 576
 577                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 578                         if (fd == -1) {
 579                                 if (errno == EEXIST) {
 580                                         pid_t old_pid;
 581                                         pidfile = fopen(PID_FILE, "r");
 582                                         if (!pidfile) {
 583                                                 perror("PID file " PID_FILE " already exists, already running?");
 584                                                 exit(EXIT_FAILURE);
 585                                         }
 586
 587                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 588                                                 fclose(pidfile);
 589                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 590                                                 exit(EXIT_FAILURE);
 591                                         }
 592
 593                                         fclose(pidfile);
 594
 595                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 596                                         exit(EXIT_FAILURE);
 597                                 }
 598                                 perror("Can't create PID file " PID_FILE);
 599                                 exit(EXIT_FAILURE);
 600                         }
 601
 602                         pidfile = fdopen(fd, "w");
 603                         if (!pidfile) {
 604                                 perror("Can't reopen PID file fd");
 605                                 exit(EXIT_FAILURE);
 606                         }
 607
 608                         memset(&sact, 0, sizeof(sact));
 609                         sact.sa_handler = sigterm_handler;
 610
 611                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 612                                 perror("sigaction(SIGTERM)");
 613                                 exit(EXIT_FAILURE);
 614                         }
 615                 }
 616
 617                 pid = fork();
 618                 if (pid > 0) {
 619                         if (pidfile) {
 620                                 fprintf(pidfile, "%u\n", pid);
 621                                 fclose(pidfile);
 622                         }
 623
 624                         printf("Daemon with PID %u started!\n", pid);
 625                         exit(EXIT_SUCCESS);
 626                 } else if (pid < 0) {
 627                         perror("fork");
 628                         exit(EXIT_FAILURE);
 629                 }
 630
 631                 if (pidfile)
 632                         fclose(pidfile);
 633         }
 634
 635         memset(&sact, 0, sizeof(sact));
 636         sact.sa_handler = SIG_IGN;
 637
 638         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 639                 perror("sigaction(SIGPIPE)");
 640                 exit(EXIT_FAILURE);
 641         }
 642
 643         impersonate_hmlanif = 1;
 644
 645         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 646         if (sock == -1) {
 647                 perror("Can't open socket");
 648                 return EXIT_FAILURE;
 649         }
 650
 651         n = 1;
 652         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 653                 perror("Can't set socket options");
 654                 return EXIT_FAILURE;
 655         }
 656
 657         memset(&sin, 0, sizeof(sin));
 658         sin.sin_family = AF_INET;
 659         sin.sin_port = htons(port);
 660         if (!iface) {
 661                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 662         } else {
 663                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 664                         fprintf(stderr, "Can't convert IP %s, aborting!\n", iface);
 665                         return EXIT_FAILURE;
 666                 }
 667         }
 668
 669         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 670                 perror("Can't bind socket");
 671                 return EXIT_FAILURE;
 672         }
 673
 674         if (listen(sock, 1) == -1) {
 675                 perror("Can't listen on socket");
 676                 return EXIT_FAILURE;
 677         }
 678
 679         while(1) {
 680                 struct sockaddr_in csin;
 681                 socklen_t csinlen;
 682                 int client;
 683                 in_addr_t client_addr;
 684
 685                 memset(&csin, 0, sizeof(csin));
 686                 csinlen = sizeof(csin);
 687                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 688                 if (client == -1) {
 689                         perror("Couldn't accept client");
 690                         continue;
 691                 }
 692
 693                 /* FIXME: getnameinfo... */
 694                 client_addr = ntohl(csin.sin_addr.s_addr);
 695
 696                 if (verbose) {
 697                         print_timestamp(stdout);
 698                         printf("Client %d.%d.%d.%d connected!\n",
 699                                         (client_addr & 0xff000000) >> 24,
 700                                         (client_addr & 0x00ff0000) >> 16,
 701                                         (client_addr & 0x0000ff00) >> 8,
 702                                         (client_addr & 0x000000ff));
 703                 }
 704
 705                 comm(client, client, sock, flags);
 706
 707                 shutdown(client, SHUT_RDWR);
 708                 close(client);
 709
 710                 if (verbose) {
 711                         print_timestamp(stdout);
 712                         printf("Connection to %d.%d.%d.%d closed!\n",
 713                                         (client_addr & 0xff000000) >> 24,
 714                                         (client_addr & 0x00ff0000) >> 16,
 715                                         (client_addr & 0x0000ff00) >> 8,
 716                                         (client_addr & 0x000000ff));
 717                 }
 718                 sleep(1);
 719         }
 720
 721         return EXIT_SUCCESS;
 722 }
 723
 724 static int interactive_server(int flags)
 725 {
 726         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1, flags))
 727                 return EXIT_FAILURE;
 728
 729         return EXIT_SUCCESS;
 730 }
 731
 732 void hmlan_syntax(char *prog)
 733 {
 734         fprintf(stderr, "Syntax: %s options\n\n", prog);
 735         fprintf(stderr, "Possible options:\n");
 736         fprintf(stderr, "\t-D\t\tdebug mode\n");
 737         fprintf(stderr, "\t-d\t\tdaemon mode\n");
 738         fprintf(stderr, "\t-h\t\tthis help\n");
 739         fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 740         fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
 741         fprintf(stderr, "\t-P\t\tcreate PID file " PID_FILE " in daemon mode\n");
 742         fprintf(stderr, "\t-p n\t\tlisten on port n (default: 1000)\n");
 743         fprintf(stderr, "\t-r n\t\treboot HM-CFG-USB after n seconds (0: no reboot, default: %u)\n", DEFAULT_REBOOT_SECONDS);
 744         fprintf(stderr, "\t   hh:mm\treboot HM-CFG-USB daily at hh:mm\n");
 745         fprintf(stderr, "\t-v\t\tverbose mode\n");
 746         fprintf(stderr, "\t-V\t\tshow version (" VERSION ")\n");
 747
 748 }
 749
 750 int main(int argc, char **argv)
 751 {
 752         int port = 1000;
 753         char *iface = NULL;
 754         int interactive = 0;
 755         int flags = 0;
 756         char *ep;
 757         int opt;
 758
 759         reboot_seconds = DEFAULT_REBOOT_SECONDS;
 760
 761         while((opt = getopt(argc, argv, "DdhiPp:Rr:l:vV")) != -1) {
 762                 switch (opt) {
 763                         case 'D':
 764                                 debug = 1;
 765                                 verbose = 1;
 766                                 break;
 767                         case 'd':
 768                                 flags |= FLAG_DAEMON;
 769                                 break;
 770                         case 'i':
 771                                 interactive = 1;
 772                                 break;
 773                         case 'P':
 774                                 flags |= FLAG_PID_FILE;
 775                                 break;
 776                         case 'p':
 777                                 port = strtoul(optarg, &ep, 10);
 778                                 if (*ep != '\0') {
 779                                         fprintf(stderr, "Can't parse port!\n");
 780                                         exit(EXIT_FAILURE);
 781                                 }
 782                                 break;
 783                         case 'R':
 784                                 fprintf(stderr, "-R is no longer needed (1s wakeup is default)\n");
 785                                 break;
 786                         case 'r':
 787                                 reboot_seconds = strtoul(optarg, &ep, 10);
 788                                 if (*ep != '\0') {
 789                                         if (*ep == ':') {
 790                                                 reboot_at_hour = reboot_seconds;
 791                                                 ep++;
 792                                                 reboot_at_minute = strtoul(ep, &ep, 10);
 793                                                 if (*ep != '\0') {
 794                                                         fprintf(stderr, "Can't parse reboot-time!\n");
 795                                                         exit(EXIT_FAILURE);
 796                                                 }
 797
 798                                                 reboot_seconds = 0;
 799                                         } else {
 800                                                 fprintf(stderr, "Can't parse reboot-timeout!\n");
 801                                                 exit(EXIT_FAILURE);
 802                                         }
 803                                 }
 804                                 break;
 805                         case 'l':
 806                                 iface = optarg;
 807                                 break;
 808                         case 'v':
 809                                 verbose = 1;
 810                                 break;
 811                         case 'V':
 812                                 printf("hmland " VERSION "\n");
 813                                 printf("Copyright (c) 2013 Michael Gernoth\n\n");
 814                                 exit(EXIT_SUCCESS);
 815                         case 'h':
 816                         case ':':
 817                         case '?':
 818                         default:
 819                                 hmlan_syntax(argv[0]);
 820                                 exit(EXIT_FAILURE);
 821                                 break;
 822                 }
 823         }
 824
 825         if (interactive) {
 826                 return interactive_server(flags);
 827         } else {
 828                 return socket_server(iface, port, flags);
 829         }
 830 }