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

   1 /* HM-CFG-LAN emulation for HM-CFG-USB
   2  *
   3  * Copyright (c) 2013-15 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 <stdarg.h>
  29 #include <string.h>
  30 #include <strings.h>
  31 #include <poll.h>
  32 #include <signal.h>
  33 #include <errno.h>
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <sys/stat.h>
  37 #include <fcntl.h>
  38 #include <time.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41 #include <libusb-1.0/libusb.h>
  42
  43 #include "version.h"
  44 #include "hexdump.h"
  45 #include "hmcfgusb.h"
  46 #include "util.h"
  47
  48 #define PID_FILE "/var/run/hmland.pid"
  49
  50 #define DEFAULT_REBOOT_SECONDS  86400
  51 #define LAN_READ_CHUNK_SIZE     2048
  52 /* Don't allow remote clients to consume all of our memory */
  53 #define LAN_MAX_LINE_LENGTH     4096
  54 #define LAN_MAX_BUF_LENGTH      1048576
  55
  56 extern char *optarg;
  57
  58 static int impersonate_hmlanif = 0;
  59 static int debug = 0;
  60 static int verbose = 0;
  61 static FILE *logfile = NULL;
  62 static int reboot_seconds = 0;
  63 static int reboot_at_hour = -1;
  64 static int reboot_at_minute = -1;
  65 static int reboot_set = 0;
  66 static uint8_t *lan_read_buf = NULL;
  67 static int lan_read_buflen = 0;
  68
  69 struct queued_rx {
  70         char *rx;
  71         int len;
  72         struct queued_rx *next;
  73 };
  74
  75 static struct queued_rx *qrx = NULL;
  76 static int wait_for_h = 0;
  77
  78 #define FLAG_LENGTH_BYTE        (1<<0)
  79 #define FLAG_FORMAT_HEX         (1<<1)
  80 #define FLAG_COMMA_BEFORE       (1<<2)
  81 #define FLAG_COMMA_AFTER        (1<<3)
  82 #define FLAG_NL                 (1<<4)
  83 #define FLAG_IGNORE_COMMAS      (1<<5)
  84
  85 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  86 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  87
  88 static void print_timestamp(FILE *f)
  89 {
  90         struct timeval tv;
  91         struct tm *tmp;
  92         char ts[32];
  93
  94         gettimeofday(&tv, NULL);
  95         tmp = localtime(&tv.tv_sec);
  96         memset(ts, 0, sizeof(ts));
  97         strftime(ts, sizeof(ts)-1, "%Y-%m-%d %H:%M:%S", tmp);
  98         fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
  99 }
 100
 101 static void write_log(char *buf, int len, char *fmt, ...)
 102 {
 103         va_list ap;
 104         int i;
 105
 106         if ((!logfile) && (!verbose))
 107                 return;
 108
 109         if (logfile)
 110                 print_timestamp(logfile);
 111         if (verbose)
 112                 print_timestamp(stdout);
 113
 114         if (fmt) {
 115                 if (logfile) {
 116                         va_start(ap, fmt);
 117                         vfprintf(logfile, fmt, ap);
 118                         va_end(ap);
 119                 }
 120                 if (verbose) {
 121                         va_start(ap, fmt);
 122                         vprintf(fmt, ap);
 123                         va_end(ap);
 124                 }
 125         }
 126
 127         if (buf && len) {
 128                 for (i = 0; i < len; i++) {
 129                         if (logfile)
 130                                 fprintf(logfile, "%c", buf[i]);
 131                         if (verbose)
 132                                 printf("%c", buf[i]);
 133                 }
 134                 if (logfile)
 135                         fprintf(logfile, "\n");
 136                 if (verbose)
 137                         printf("\n");
 138         }
 139         if (logfile)
 140                 fflush(logfile);
 141 }
 142
 143 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
 144 {
 145         uint8_t *buf_out = *outpos;
 146         uint8_t *outend = *outpos + outlen;
 147         uint8_t *inend = *inpos + inlen;
 148         int i;
 149
 150         if (flags & FLAG_COMMA_BEFORE) {
 151                 CHECK_SPACE(1);
 152                 **outpos=',';
 153                 *outpos += 1;
 154         }
 155
 156         if (flags & FLAG_LENGTH_BYTE) {
 157                 CHECK_AVAIL(1);
 158                 len = **inpos;
 159                 *inpos += 1;
 160         }
 161
 162         if (flags & FLAG_FORMAT_HEX) {
 163                 CHECK_AVAIL(len);
 164                 CHECK_SPACE(len*2);
 165                 for (i = 0; i < len; i++) {
 166                         **outpos = nibble_to_ascii(((**inpos) & 0xf0) >> 4);
 167                         *outpos += 1;
 168                         **outpos = nibble_to_ascii(((**inpos) & 0xf));
 169                         *inpos += 1; *outpos += 1;
 170                 }
 171         } else {
 172                 CHECK_AVAIL(len);
 173                 CHECK_SPACE(len);
 174                 memcpy(*outpos, *inpos, len);
 175                 *outpos += len;
 176                 *inpos += len;
 177         }
 178
 179         if (flags & FLAG_COMMA_AFTER) {
 180                 CHECK_SPACE(1);
 181                 **outpos=',';
 182                 *outpos += 1;
 183         }
 184
 185         if (flags & FLAG_NL) {
 186                 CHECK_SPACE(2);
 187                 **outpos='\r';
 188                 *outpos += 1;
 189                 **outpos='\n';
 190                 *outpos += 1;
 191         }
 192
 193         return *outpos - buf_out;
 194 }
 195
 196 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 197 {
 198         uint8_t *buf_out = *outpos;
 199         uint8_t *outend = *outpos + outlen;
 200         uint8_t *inend = *inpos + inlen;
 201
 202         if (flags & FLAG_LENGTH_BYTE) {
 203                 int len = 0;
 204                 uint8_t *ip;
 205
 206                 ip = *inpos;
 207                 while(ip < inend) {
 208                         if (*ip == ',') {
 209                                 ip++;
 210                                 if (!(flags & FLAG_IGNORE_COMMAS))
 211                                         break;
 212
 213                                 continue;
 214                         }
 215                         len++;
 216                         ip++;
 217                 }
 218                 CHECK_SPACE(1);
 219                 **outpos = (len / 2);
 220                 *outpos += 1;
 221         }
 222
 223         while(*inpos < inend) {
 224                 if (**inpos == ',') {
 225                         *inpos += 1;
 226                         if (!(flags & FLAG_IGNORE_COMMAS))
 227                                 break;
 228
 229                         continue;
 230                 }
 231
 232                 CHECK_SPACE(1);
 233                 CHECK_AVAIL(2);
 234
 235                 **outpos = ascii_to_nibble(**inpos) << 4;
 236                 *inpos += 1;
 237                 **outpos |= ascii_to_nibble(**inpos);
 238                 *inpos += 1; *outpos += 1;
 239         }
 240
 241         return *outpos - buf_out;
 242 }
 243
 244 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 245 {
 246         uint8_t out[1024];
 247         uint8_t *outpos;
 248         uint8_t *inpos;
 249         uint16_t version;
 250         int fd = *((int*)data);
 251         int w;
 252
 253         if (buf_len < 1)
 254                 return 1;
 255
 256         memset(out, 0, sizeof(out));
 257         outpos = out;
 258         inpos = buf;
 259
 260         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 261         switch(buf[0]) {
 262                 case 'H':
 263                         if (impersonate_hmlanif) {
 264                                 buf[5] = 'L';
 265                                 buf[6] = 'A';
 266                                 buf[7] = 'N';
 267                         }
 268                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 269                         version = inpos[0] << 8;
 270                         version |= inpos[1];
 271                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 272                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 273                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 274                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 275                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 276                         if (version < 0x03c7) {
 277                                 format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 278                         } else {
 279                                 format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 280                                 format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 281                         }
 282
 283                         if (!reboot_set) {
 284                                 int new_reboot_seconds;
 285
 286                                 if (version < 0x03c7) {
 287                                         new_reboot_seconds = DEFAULT_REBOOT_SECONDS;
 288                                 } else {
 289                                         new_reboot_seconds = 0;
 290                                 }
 291
 292                                 if (verbose && new_reboot_seconds && (reboot_seconds != new_reboot_seconds))
 293                                         printf("Rebooting in %u seconds due to old firmware (0.%d)\n",
 294                                                 new_reboot_seconds, version);
 295
 296                                 reboot_seconds = new_reboot_seconds;
 297                         }
 298
 299                         break;
 300                 case 'E':
 301                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 302                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 303                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 304                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 305                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 306                         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);
 307
 308                         break;
 309                 case 'R':
 310                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 311                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 312                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 313                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 314                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 315                         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);
 316
 317                         break;
 318                 case 'I':
 319                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 320                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 321                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 322                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 323
 324                         break;
 325                 case 'G':
 326                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_NL);
 327
 328                         break;
 329                 default:
 330                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 331                         hexdump(buf, buf_len, "Unknown> ");
 332                         break;
 333         }
 334
 335         /* Queue packet until first respone to 'K' is received */
 336         if (wait_for_h && buf[0] != 'H') {
 337                 struct queued_rx **rxp = &qrx;
 338
 339                 while (*rxp)
 340                         rxp = &((*rxp)->next);
 341
 342                 *rxp = malloc(sizeof(struct queued_rx));
 343                 if (!*rxp) {
 344                         perror("malloc");
 345                         return 0;
 346                 }
 347
 348                 memset(*rxp, 0, sizeof(struct queued_rx));
 349                 (*rxp)->len = outpos-out;
 350                 (*rxp)->rx = malloc((*rxp)->len);
 351                 if (!(*rxp)->rx) {
 352                         perror("malloc");
 353                         return 0;
 354                 }
 355                 memset((*rxp)->rx, 0, (*rxp)->len);
 356                 memcpy((*rxp)->rx, out, (*rxp)->len);
 357
 358                 return 1;
 359         }
 360
 361         write_log((char*)out, outpos-out-2, "LAN < ");
 362
 363         w = write(fd, out, outpos-out);
 364         if (w <= 0) {
 365                 perror("write");
 366                 return 0;
 367         }
 368
 369         /* Send all queued packets */
 370         if (wait_for_h) {
 371                 struct queued_rx *curr_rx = qrx;
 372                 struct queued_rx *last_rx;
 373
 374                 while (curr_rx) {
 375                         write_log(curr_rx->rx, curr_rx->len-2, "LAN < ");
 376
 377                         w = write(fd, curr_rx->rx, curr_rx->len);
 378                         if (w <= 0) {
 379                                 perror("write");
 380                         }
 381                         last_rx = curr_rx;
 382                         curr_rx = curr_rx->next;
 383
 384                         free(last_rx->rx);
 385                         free(last_rx);
 386                 }
 387
 388                 qrx = NULL;
 389
 390                 wait_for_h = 0;
 391         }
 392
 393         return 1;
 394 }
 395
 396 static int hmlan_parse_one(uint8_t *cmd, int last, void *data)
 397 {
 398         struct hmcfgusb_dev *dev = data;
 399         uint8_t out[0x40]; //FIXME!!!
 400         uint8_t *outpos;
 401         uint8_t *inpos = cmd;
 402
 403         outpos = out;
 404
 405         if (last == 0)
 406                 return 1;
 407
 408         write_log((char*)cmd, last,  "LAN > ");
 409
 410         memset(out, 0, sizeof(out));
 411         *outpos++ = *inpos++;
 412
 413         switch(*cmd) {
 414                 case 'S':
 415                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 416                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 417                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 418                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 419                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 420                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 421                         break;
 422                 case 'Y':
 423                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 424                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 425                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 426                         break;
 427                 case '+':
 428                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 429                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 430                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
 431                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 432                 default:
 433                         parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 434                         break;
 435         }
 436
 437         hmcfgusb_send(dev, out, sizeof(out), 1);
 438
 439         return 1;
 440 }
 441
 442 static int hmlan_parse_in(int fd, void *data)
 443 {
 444         uint8_t *newbuf;
 445         int r;
 446         int i;
 447
 448         newbuf = realloc(lan_read_buf, lan_read_buflen + LAN_READ_CHUNK_SIZE);
 449         if (!newbuf) {
 450                 perror("realloc");
 451                 return 0;
 452         }
 453         lan_read_buf = newbuf;
 454         r = read(fd, lan_read_buf + lan_read_buflen, LAN_READ_CHUNK_SIZE);
 455         if (r > 0) {
 456                 lan_read_buflen += r;
 457                 if (lan_read_buflen > LAN_MAX_BUF_LENGTH) {
 458                         if (verbose)
 459                                 printf("Our buffer is bigger than %d bytes (%d bytes), closing connection!\n", LAN_MAX_BUF_LENGTH, lan_read_buflen);
 460                         return -1;
 461                 }
 462                 while(lan_read_buflen > 0) {
 463                         int found = 0;
 464
 465                         for (i = 0; i < lan_read_buflen; i++) {
 466                                 if ((lan_read_buf[i] == '\r') || (lan_read_buf[i] == '\n')) {
 467                                         if (i > 0)
 468                                                 hmlan_parse_one(lan_read_buf, i, data);
 469                                         memmove(lan_read_buf, lan_read_buf + i + 1, lan_read_buflen - (i + 1));
 470                                         lan_read_buflen -= (i + 1);
 471                                         found = 1;
 472                                         break;
 473                                 }
 474                                 if (i > LAN_MAX_LINE_LENGTH) {
 475                                         if (verbose)
 476                                                 printf("Client sent more than %d bytes without newline, closing connection!\n", LAN_MAX_LINE_LENGTH);
 477                                         return -1;
 478                                 }
 479                         }
 480                         if (!found)
 481                                 break;
 482                         newbuf = realloc(lan_read_buf, lan_read_buflen);
 483                         if (lan_read_buflen && !newbuf) {
 484                                 perror("realloc");
 485                                 return 0;
 486                         }
 487                         lan_read_buf = newbuf;
 488                 }
 489         } else if (r < 0) {
 490                 if (errno != ECONNRESET)
 491                         perror("read");
 492                 return r;
 493         } else {
 494                 return 0;
 495         }
 496
 497         return 1;
 498 }
 499
 500 static int comm(int fd_in, int fd_out, int master_socket, int flags)
 501 {
 502         struct hmcfgusb_dev *dev;
 503         uint8_t out[0x40]; //FIXME!!!
 504         int quit = 0;
 505
 506         hmcfgusb_set_debug(debug);
 507
 508         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 509         if (!dev) {
 510                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 511                 return 0;
 512         }
 513
 514         if (dev->bootloader) {
 515                 if (verbose)
 516                         printf("HM-CFG-USB in bootloader mode, restarting in normal mode...\n");
 517
 518                 hmcfgusb_leave_bootloader(dev);
 519
 520                 hmcfgusb_close(dev);
 521                 sleep(1);
 522                 return 0;
 523         }
 524
 525         if ((reboot_at_hour != -1) && (reboot_at_minute != -1)) {
 526                 struct tm *tm_s;
 527                 time_t tm;
 528
 529                 tm = time(NULL);
 530                 tm_s = localtime(&tm);
 531                 if (tm_s == NULL) {
 532                         perror("localtime");
 533                         return 0;
 534                 }
 535
 536                 tm_s->tm_hour = reboot_at_hour;
 537                 tm_s->tm_min = reboot_at_minute;
 538                 tm_s->tm_sec = 0;
 539
 540                 tm = mktime(tm_s);
 541                 reboot_seconds = tm - dev->opened_at;
 542
 543                 while (reboot_seconds <= 0)
 544                         reboot_seconds += 86400;
 545         }
 546
 547         if (verbose && reboot_seconds)
 548                 printf("Rebooting in %u seconds\n", reboot_seconds);
 549
 550
 551         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 552                 fprintf(stderr, "Can't add client to pollfd!\n");
 553                 hmcfgusb_close(dev);
 554                 return 0;
 555         }
 556
 557         if (master_socket >= 0) {
 558                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 559                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 560                         hmcfgusb_close(dev);
 561                         return 0;
 562                 }
 563         }
 564
 565         memset(out, 0, sizeof(out));
 566         out[0] = 'K';
 567         wait_for_h = 1;
 568         hmcfgusb_send_null_frame(dev, 1);
 569         hmcfgusb_send(dev, out, sizeof(out), 1);
 570
 571         while(!quit) {
 572                 int fd;
 573
 574                 fd = hmcfgusb_poll(dev, 1000);  /* Wakeup device/bus at least once a second */
 575                 if (fd >= 0) {
 576                         if (fd == master_socket) {
 577                                 int client;
 578
 579                                 client = accept(master_socket, NULL, 0);
 580                                 if (client >= 0) {
 581                                         shutdown(client, SHUT_RDWR);
 582                                         close(client);
 583                                 }
 584                         } else {
 585                                 if (hmlan_parse_in(fd, dev) <= 0) {
 586                                         quit = 1;
 587                                 }
 588                         }
 589                 } else if (fd == -1) {
 590                         if (errno) {
 591                                 if (errno != ETIMEDOUT) {
 592                                         perror("hmcfgusb_poll");
 593                                         quit = 1;
 594                                 } else {
 595                                         /* periodically wakeup the device */
 596                                         hmcfgusb_send_null_frame(dev, 1);
 597                                         if (wait_for_h) {
 598                                                 memset(out, 0, sizeof(out));
 599                                                 out[0] = 'K';
 600                                                 hmcfgusb_send(dev, out, sizeof(out), 1);
 601                                         }
 602                                 }
 603                         }
 604                 }
 605
 606                 if (reboot_seconds && ((dev->opened_at + reboot_seconds) <= time(NULL))) {
 607                         if (verbose) {
 608                                 printf("HM-CFG-USB running since %lu seconds, rebooting now...\n",
 609                                         time(NULL) - dev->opened_at);
 610                         }
 611                         hmcfgusb_enter_bootloader(dev);
 612                 }
 613         }
 614
 615         hmcfgusb_close(dev);
 616         return 1;
 617 }
 618
 619 void sigterm_handler(int sig)
 620 {
 621         if (unlink(PID_FILE) == -1)
 622                 perror("Can't remove PID file");
 623
 624         exit(EXIT_SUCCESS);
 625 }
 626
 627 #define FLAG_DAEMON     (1 << 0)
 628 #define FLAG_PID_FILE   (1 << 1)
 629
 630 static int socket_server(char *iface, int port, int flags)
 631 {
 632         struct sigaction sact;
 633         struct sockaddr_in sin;
 634         int sock;
 635         int n;
 636         pid_t pid;
 637
 638         if (flags & FLAG_DAEMON) {
 639                 FILE *pidfile = NULL;
 640
 641                 if (flags & FLAG_PID_FILE) {
 642                         int fd;
 643
 644                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 645                         if (fd == -1) {
 646                                 if (errno == EEXIST) {
 647                                         pid_t old_pid;
 648                                         pidfile = fopen(PID_FILE, "r");
 649                                         if (!pidfile) {
 650                                                 perror("PID file " PID_FILE " already exists, already running?");
 651                                                 exit(EXIT_FAILURE);
 652                                         }
 653
 654                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 655                                                 fclose(pidfile);
 656                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 657                                                 exit(EXIT_FAILURE);
 658                                         }
 659
 660                                         fclose(pidfile);
 661
 662                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 663                                         exit(EXIT_FAILURE);
 664                                 }
 665                                 perror("Can't create PID file " PID_FILE);
 666                                 exit(EXIT_FAILURE);
 667                         }
 668
 669                         pidfile = fdopen(fd, "w");
 670                         if (!pidfile) {
 671                                 perror("Can't reopen PID file fd");
 672                                 exit(EXIT_FAILURE);
 673                         }
 674
 675                         memset(&sact, 0, sizeof(sact));
 676                         sact.sa_handler = sigterm_handler;
 677
 678                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 679                                 perror("sigaction(SIGTERM)");
 680                                 exit(EXIT_FAILURE);
 681                         }
 682                 }
 683
 684                 pid = fork();
 685                 if (pid > 0) {
 686                         if (pidfile) {
 687                                 fprintf(pidfile, "%u\n", pid);
 688                                 fclose(pidfile);
 689                         }
 690
 691                         printf("Daemon with PID %u started!\n", pid);
 692                         exit(EXIT_SUCCESS);
 693                 } else if (pid < 0) {
 694                         perror("fork");
 695                         exit(EXIT_FAILURE);
 696                 }
 697
 698                 if (pidfile)
 699                         fclose(pidfile);
 700         }
 701
 702         memset(&sact, 0, sizeof(sact));
 703         sact.sa_handler = SIG_IGN;
 704
 705         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 706                 perror("sigaction(SIGPIPE)");
 707                 exit(EXIT_FAILURE);
 708         }
 709
 710         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 711         if (sock == -1) {
 712                 perror("Can't open socket");
 713                 return EXIT_FAILURE;
 714         }
 715
 716         n = 1;
 717         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 718                 perror("Can't set socket options");
 719                 return EXIT_FAILURE;
 720         }
 721
 722         memset(&sin, 0, sizeof(sin));
 723         sin.sin_family = AF_INET;
 724         sin.sin_port = htons(port);
 725         if (!iface) {
 726                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 727         } else {
 728                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 729                         fprintf(stderr, "Can't convert IP %s, aborting!\n", iface);
 730                         return EXIT_FAILURE;
 731                 }
 732         }
 733
 734         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 735                 perror("Can't bind socket");
 736                 return EXIT_FAILURE;
 737         }
 738
 739         if (listen(sock, 1) == -1) {
 740                 perror("Can't listen on socket");
 741                 return EXIT_FAILURE;
 742         }
 743
 744         while(1) {
 745                 struct sockaddr_in csin;
 746                 socklen_t csinlen;
 747                 int client;
 748                 in_addr_t client_addr;
 749
 750                 memset(&csin, 0, sizeof(csin));
 751                 csinlen = sizeof(csin);
 752                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 753                 if (client == -1) {
 754                         perror("Couldn't accept client");
 755                         continue;
 756                 }
 757
 758                 /* FIXME: getnameinfo... */
 759                 client_addr = ntohl(csin.sin_addr.s_addr);
 760
 761                 write_log(NULL, 0, "Client %d.%d.%d.%d connected!\n",
 762                                 (client_addr & 0xff000000) >> 24,
 763                                 (client_addr & 0x00ff0000) >> 16,
 764                                 (client_addr & 0x0000ff00) >> 8,
 765                                 (client_addr & 0x000000ff));
 766
 767                 comm(client, client, sock, flags);
 768
 769                 shutdown(client, SHUT_RDWR);
 770                 close(client);
 771
 772                 if (lan_read_buf)
 773                         free(lan_read_buf);
 774                 lan_read_buf = NULL;
 775                 lan_read_buflen = 0;
 776
 777                 write_log(NULL, 0, "Connection to %d.%d.%d.%d closed!\n",
 778                                 (client_addr & 0xff000000) >> 24,
 779                                 (client_addr & 0x00ff0000) >> 16,
 780                                 (client_addr & 0x0000ff00) >> 8,
 781                                 (client_addr & 0x000000ff));
 782                 sleep(1);
 783         }
 784
 785         return EXIT_SUCCESS;
 786 }
 787
 788 static int interactive_server(int flags)
 789 {
 790         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1, flags))
 791                 return EXIT_FAILURE;
 792
 793         return EXIT_SUCCESS;
 794 }
 795
 796 void hmlan_syntax(char *prog)
 797 {
 798         fprintf(stderr, "Syntax: %s options\n\n", prog);
 799         fprintf(stderr, "Possible options:\n");
 800         fprintf(stderr, "\t-D\t\tdebug mode\n");
 801         fprintf(stderr, "\t-d\t\tdaemon mode\n");
 802         fprintf(stderr, "\t-h\t\tthis help\n");
 803         fprintf(stderr, "\t-I\t\tpretend to be HM-LAN-IF for compatibility with client-software (previous default)\n");
 804         fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 805         fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
 806         fprintf(stderr, "\t-L logfile\tlog network-communication to logfile\n");
 807         fprintf(stderr, "\t-P\t\tcreate PID file " PID_FILE " in daemon mode\n");
 808         fprintf(stderr, "\t-p n\t\tlisten on port n (default: 1000)\n");
 809         fprintf(stderr, "\t-r n\t\treboot HM-CFG-USB after n seconds (0: no reboot, default: %u if FW < 0.967, 0 otherwise)\n", DEFAULT_REBOOT_SECONDS);
 810         fprintf(stderr, "\t   hh:mm\treboot HM-CFG-USB daily at hh:mm\n");
 811         fprintf(stderr, "\t-v\t\tverbose mode\n");
 812         fprintf(stderr, "\t-V\t\tshow version (" VERSION ")\n");
 813
 814 }
 815
 816 int main(int argc, char **argv)
 817 {
 818         int port = 1000;
 819         char *iface = NULL;
 820         int interactive = 0;
 821         int flags = 0;
 822         char *ep;
 823         int opt;
 824
 825         while((opt = getopt(argc, argv, "DdhIiPp:Rr:l:L:vV")) != -1) {
 826                 switch (opt) {
 827                         case 'D':
 828                                 debug = 1;
 829                                 verbose = 1;
 830                                 break;
 831                         case 'd':
 832                                 flags |= FLAG_DAEMON;
 833                                 break;
 834                         case 'I':
 835                                 impersonate_hmlanif = 1;
 836                                 break;
 837                         case 'i':
 838                                 interactive = 1;
 839                                 break;
 840                         case 'P':
 841                                 flags |= FLAG_PID_FILE;
 842                                 break;
 843                         case 'p':
 844                                 port = strtoul(optarg, &ep, 10);
 845                                 if (*ep != '\0') {
 846                                         fprintf(stderr, "Can't parse port!\n");
 847                                         exit(EXIT_FAILURE);
 848                                 }
 849                                 break;
 850                         case 'R':
 851                                 fprintf(stderr, "-R is no longer needed (1s wakeup is default)\n");
 852                                 break;
 853                         case 'r':
 854                                 reboot_seconds = strtoul(optarg, &ep, 10);
 855                                 if (*ep != '\0') {
 856                                         if (*ep == ':') {
 857                                                 reboot_at_hour = reboot_seconds;
 858                                                 ep++;
 859                                                 reboot_at_minute = strtoul(ep, &ep, 10);
 860                                                 if (*ep != '\0') {
 861                                                         fprintf(stderr, "Can't parse reboot-time!\n");
 862                                                         exit(EXIT_FAILURE);
 863                                                 }
 864
 865                                                 reboot_seconds = 0;
 866                                         } else {
 867                                                 fprintf(stderr, "Can't parse reboot-timeout!\n");
 868                                                 exit(EXIT_FAILURE);
 869                                         }
 870                                 }
 871                                 reboot_set = 1;
 872                                 break;
 873                         case 'l':
 874                                 iface = optarg;
 875                                 break;
 876                         case 'L':
 877                                 logfile = fopen(optarg, "a");
 878                                 if (!logfile) {
 879                                         perror("fopen(logfile)");
 880                                         exit(EXIT_FAILURE);
 881                                 }
 882                                 break;
 883                         case 'v':
 884                                 verbose = 1;
 885                                 break;
 886                         case 'V':
 887                                 printf("hmland " VERSION "\n");
 888                                 printf("Copyright (c) 2013-15 Michael Gernoth\n\n");
 889                                 exit(EXIT_SUCCESS);
 890                         case 'h':
 891                         case ':':
 892                         case '?':
 893                         default:
 894                                 hmlan_syntax(argv[0]);
 895                                 exit(EXIT_FAILURE);
 896                                 break;
 897                 }
 898         }
 899
 900         if (interactive) {
 901                 return interactive_server(flags);
 902         } else {
 903                 return socket_server(iface, port, flags);
 904         }
 905 }