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 "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                 case 'G':
 267                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_NL);
 268
 269                         break;
 270                 default:
 271                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 272                         hexdump(buf, buf_len, "Unknown> ");
 273                         break;
 274         }
 275
 276         /* Queue packet until first respone to 'K' is received */
 277         if (wait_for_h && buf[0] != 'H') {
 278                 struct queued_rx **rxp = &qrx;
 279
 280                 while (*rxp)
 281                         rxp = &((*rxp)->next);
 282
 283                 *rxp = malloc(sizeof(struct queued_rx));
 284                 if (!*rxp) {
 285                         perror("malloc");
 286                         return 0;
 287                 }
 288
 289                 memset(*rxp, 0, sizeof(struct queued_rx));
 290                 (*rxp)->len = outpos-out;
 291                 (*rxp)->rx = malloc((*rxp)->len);
 292                 if (!(*rxp)->rx) {
 293                         perror("malloc");
 294                         return 0;
 295                 }
 296                 memset((*rxp)->rx, 0, (*rxp)->len);
 297                 memcpy((*rxp)->rx, out, (*rxp)->len);
 298
 299                 return 1;
 300         }
 301
 302         if (verbose) {
 303                 int i;
 304
 305                 print_timestamp(stdout);
 306                 printf("LAN < ");
 307                 for (i = 0; i < outpos-out-2; i++)
 308                         printf("%c", out[i]);
 309                 printf("\n");
 310         }
 311
 312         w = write(fd, out, outpos-out);
 313         if (w <= 0) {
 314                 perror("write");
 315                 return 0;
 316         }
 317
 318         /* Send all queued packets */
 319         if (wait_for_h) {
 320                 struct queued_rx *curr_rx = qrx;
 321                 struct queued_rx *last_rx;
 322
 323                 while (curr_rx) {
 324                         if (verbose) {
 325                                 int i;
 326
 327                                 print_timestamp(stdout);
 328                                 printf("LAN < ");
 329                                 for (i = 0; i < curr_rx->len-2; i++)
 330                                         printf("%c", curr_rx->rx[i]);
 331                                 printf("\n");
 332                         }
 333
 334                         w = write(fd, curr_rx->rx, curr_rx->len);
 335                         if (w <= 0) {
 336                                 perror("write");
 337                         }
 338                         last_rx = curr_rx;
 339                         curr_rx = curr_rx->next;
 340
 341                         free(last_rx->rx);
 342                         free(last_rx);
 343                 }
 344
 345                 qrx = NULL;
 346
 347                 wait_for_h = 0;
 348         }
 349
 350         return 1;
 351 }
 352
 353 static int hmlan_parse_in(int fd, void *data)
 354 {
 355         struct hmcfgusb_dev *dev = data;
 356         uint8_t buf[1025];
 357         uint8_t out[0x40]; //FIXME!!!
 358         uint8_t *outpos;
 359         uint8_t *inpos;
 360         int i;
 361         int last;
 362         int r;
 363
 364         memset(buf, 0, sizeof(buf));
 365
 366         r = read(fd, buf, sizeof(buf)-1);
 367         if (r > 0) {
 368                 uint8_t *inend = buf + r;
 369
 370                 inpos = buf;
 371
 372                 while (inpos < inend) {
 373                         uint8_t *instart = inpos;
 374
 375                         if ((*inpos == '\r') || (*inpos == '\n')) {
 376                                 inpos++;
 377                                 continue;
 378                         }
 379
 380                         outpos = out;
 381
 382                         last = inend - inpos;
 383
 384                         for (i = 0; i < last; i++) {
 385                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 386                                         last = i;
 387                                         break;
 388                                 }
 389                         }
 390
 391                         if (last == 0)
 392                                 continue;
 393
 394                         if (verbose) {
 395                                 print_timestamp(stdout);
 396                                 printf("LAN > ");
 397                                 for (i = 0; i < last; i++)
 398                                         printf("%c", instart[i]);
 399                                 printf("\n");
 400                         }
 401
 402                         memset(out, 0, sizeof(out));
 403                         *outpos++ = *inpos++;
 404
 405                         switch(*instart) {
 406                                 case 'S':
 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)), 0);
 409                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 410                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 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                                 case 'Y':
 415                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 416                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 417                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 418                                         break;
 419                                 default:
 420                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 421                                         break;
 422                         }
 423
 424                         hmcfgusb_send(dev, out, sizeof(out), 1);
 425                 }
 426         } else if (r < 0) {
 427                 if (errno != ECONNRESET)
 428                         perror("read");
 429                 return r;
 430         } else {
 431                 return 0;
 432         }
 433
 434         return 1;
 435 }
 436
 437 static int comm(int fd_in, int fd_out, int master_socket, int flags)
 438 {
 439         struct hmcfgusb_dev *dev;
 440         uint8_t out[0x40]; //FIXME!!!
 441         int quit = 0;
 442
 443         hmcfgusb_set_debug(debug);
 444
 445         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 446         if (!dev) {
 447                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 448                 return 0;
 449         }
 450
 451         if (dev->bootloader) {
 452                 if (verbose)
 453                         printf("HM-CFG-USB in bootloader mode, restarting in normal mode...\n");
 454
 455                 hmcfgusb_leave_bootloader(dev);
 456
 457                 hmcfgusb_close(dev);
 458                 sleep(1);
 459                 return 0;
 460         }
 461
 462         if ((reboot_at_hour != -1) && (reboot_at_minute != -1)) {
 463                 struct tm *tm_s;
 464                 time_t tm;
 465
 466                 tm = time(NULL);
 467                 tm_s = localtime(&tm);
 468                 if (tm_s == NULL) {
 469                         perror("localtime");
 470                         return 0;
 471                 }
 472
 473                 tm_s->tm_hour = reboot_at_hour;
 474                 tm_s->tm_min = reboot_at_minute;
 475                 tm_s->tm_sec = 0;
 476
 477                 tm = mktime(tm_s);
 478                 reboot_seconds = tm - dev->opened_at;
 479
 480                 while (reboot_seconds <= 0)
 481                         reboot_seconds += 86400;
 482         }
 483
 484         if (verbose && reboot_seconds)
 485                 printf("Rebooting in %u seconds\n", reboot_seconds);
 486
 487
 488         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 489                 fprintf(stderr, "Can't add client to pollfd!\n");
 490                 hmcfgusb_close(dev);
 491                 return 0;
 492         }
 493
 494         if (master_socket >= 0) {
 495                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 496                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 497                         hmcfgusb_close(dev);
 498                         return 0;
 499                 }
 500         }
 501
 502         memset(out, 0, sizeof(out));
 503         out[0] = 'K';
 504         wait_for_h = 1;
 505         hmcfgusb_send_null_frame(dev, 1);
 506         hmcfgusb_send(dev, out, sizeof(out), 1);
 507
 508         while(!quit) {
 509                 int fd;
 510
 511                 fd = hmcfgusb_poll(dev, 1000);  /* Wakeup device/bus at least once a second */
 512                 if (fd >= 0) {
 513                         if (fd == master_socket) {
 514                                 int client;
 515
 516                                 client = accept(master_socket, NULL, 0);
 517                                 if (client >= 0) {
 518                                         shutdown(client, SHUT_RDWR);
 519                                         close(client);
 520                                 }
 521                         } else {
 522                                 if (hmlan_parse_in(fd, dev) <= 0) {
 523                                         quit = 1;
 524                                 }
 525                         }
 526                 } else if (fd == -1) {
 527                         if (errno) {
 528                                 if (errno != ETIMEDOUT) {
 529                                         perror("hmcfgusb_poll");
 530                                         quit = 1;
 531                                 } else {
 532                                         /* periodically wakeup the device */
 533                                         hmcfgusb_send_null_frame(dev, 1);
 534                                         if (wait_for_h) {
 535                                                 memset(out, 0, sizeof(out));
 536                                                 out[0] = 'K';
 537                                                 hmcfgusb_send(dev, out, sizeof(out), 1);
 538                                         }
 539                                 }
 540                         }
 541                 }
 542
 543                 if (reboot_seconds && ((dev->opened_at + reboot_seconds) <= time(NULL))) {
 544                         if (verbose) {
 545                                 printf("HM-CFG-USB running since %lu seconds, rebooting now...\n",
 546                                         time(NULL) - dev->opened_at);
 547                         }
 548                         hmcfgusb_enter_bootloader(dev);
 549                 }
 550         }
 551
 552         hmcfgusb_close(dev);
 553         return 1;
 554 }
 555
 556 void sigterm_handler(int sig)
 557 {
 558         if (unlink(PID_FILE) == -1)
 559                 perror("Can't remove PID file");
 560
 561         exit(EXIT_SUCCESS);
 562 }
 563
 564 #define FLAG_DAEMON     (1 << 0)
 565 #define FLAG_PID_FILE   (1 << 1)
 566
 567 static int socket_server(char *iface, int port, int flags)
 568 {
 569         struct sigaction sact;
 570         struct sockaddr_in sin;
 571         int sock;
 572         int n;
 573         pid_t pid;
 574
 575         if (flags & FLAG_DAEMON) {
 576                 FILE *pidfile = NULL;
 577
 578                 if (flags & FLAG_PID_FILE) {
 579                         int fd;
 580
 581                         fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
 582                         if (fd == -1) {
 583                                 if (errno == EEXIST) {
 584                                         pid_t old_pid;
 585                                         pidfile = fopen(PID_FILE, "r");
 586                                         if (!pidfile) {
 587                                                 perror("PID file " PID_FILE " already exists, already running?");
 588                                                 exit(EXIT_FAILURE);
 589                                         }
 590
 591                                         if (fscanf(pidfile, "%u", &old_pid) != 1) {
 592                                                 fclose(pidfile);
 593                                                 fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
 594                                                 exit(EXIT_FAILURE);
 595                                         }
 596
 597                                         fclose(pidfile);
 598
 599                                         fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
 600                                         exit(EXIT_FAILURE);
 601                                 }
 602                                 perror("Can't create PID file " PID_FILE);
 603                                 exit(EXIT_FAILURE);
 604                         }
 605
 606                         pidfile = fdopen(fd, "w");
 607                         if (!pidfile) {
 608                                 perror("Can't reopen PID file fd");
 609                                 exit(EXIT_FAILURE);
 610                         }
 611
 612                         memset(&sact, 0, sizeof(sact));
 613                         sact.sa_handler = sigterm_handler;
 614
 615                         if (sigaction(SIGTERM, &sact, NULL) == -1) {
 616                                 perror("sigaction(SIGTERM)");
 617                                 exit(EXIT_FAILURE);
 618                         }
 619                 }
 620
 621                 pid = fork();
 622                 if (pid > 0) {
 623                         if (pidfile) {
 624                                 fprintf(pidfile, "%u\n", pid);
 625                                 fclose(pidfile);
 626                         }
 627
 628                         printf("Daemon with PID %u started!\n", pid);
 629                         exit(EXIT_SUCCESS);
 630                 } else if (pid < 0) {
 631                         perror("fork");
 632                         exit(EXIT_FAILURE);
 633                 }
 634
 635                 if (pidfile)
 636                         fclose(pidfile);
 637         }
 638
 639         memset(&sact, 0, sizeof(sact));
 640         sact.sa_handler = SIG_IGN;
 641
 642         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 643                 perror("sigaction(SIGPIPE)");
 644                 exit(EXIT_FAILURE);
 645         }
 646
 647         impersonate_hmlanif = 1;
 648
 649         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 650         if (sock == -1) {
 651                 perror("Can't open socket");
 652                 return EXIT_FAILURE;
 653         }
 654
 655         n = 1;
 656         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 657                 perror("Can't set socket options");
 658                 return EXIT_FAILURE;
 659         }
 660
 661         memset(&sin, 0, sizeof(sin));
 662         sin.sin_family = AF_INET;
 663         sin.sin_port = htons(port);
 664         if (!iface) {
 665                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
 666         } else {
 667                 if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
 668                         fprintf(stderr, "Can't convert IP %s, aborting!\n", iface);
 669                         return EXIT_FAILURE;
 670                 }
 671         }
 672
 673         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 674                 perror("Can't bind socket");
 675                 return EXIT_FAILURE;
 676         }
 677
 678         if (listen(sock, 1) == -1) {
 679                 perror("Can't listen on socket");
 680                 return EXIT_FAILURE;
 681         }
 682
 683         while(1) {
 684                 struct sockaddr_in csin;
 685                 socklen_t csinlen;
 686                 int client;
 687                 in_addr_t client_addr;
 688
 689                 memset(&csin, 0, sizeof(csin));
 690                 csinlen = sizeof(csin);
 691                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 692                 if (client == -1) {
 693                         perror("Couldn't accept client");
 694                         continue;
 695                 }
 696
 697                 /* FIXME: getnameinfo... */
 698                 client_addr = ntohl(csin.sin_addr.s_addr);
 699
 700                 if (verbose) {
 701                         print_timestamp(stdout);
 702                         printf("Client %d.%d.%d.%d connected!\n",
 703                                         (client_addr & 0xff000000) >> 24,
 704                                         (client_addr & 0x00ff0000) >> 16,
 705                                         (client_addr & 0x0000ff00) >> 8,
 706                                         (client_addr & 0x000000ff));
 707                 }
 708
 709                 comm(client, client, sock, flags);
 710
 711                 shutdown(client, SHUT_RDWR);
 712                 close(client);
 713
 714                 if (verbose) {
 715                         print_timestamp(stdout);
 716                         printf("Connection to %d.%d.%d.%d closed!\n",
 717                                         (client_addr & 0xff000000) >> 24,
 718                                         (client_addr & 0x00ff0000) >> 16,
 719                                         (client_addr & 0x0000ff00) >> 8,
 720                                         (client_addr & 0x000000ff));
 721                 }
 722                 sleep(1);
 723         }
 724
 725         return EXIT_SUCCESS;
 726 }
 727
 728 static int interactive_server(int flags)
 729 {
 730         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1, flags))
 731                 return EXIT_FAILURE;
 732
 733         return EXIT_SUCCESS;
 734 }
 735
 736 void hmlan_syntax(char *prog)
 737 {
 738         fprintf(stderr, "Syntax: %s options\n\n", prog);
 739         fprintf(stderr, "Possible options:\n");
 740         fprintf(stderr, "\t-D\t\tdebug mode\n");
 741         fprintf(stderr, "\t-d\t\tdaemon mode\n");
 742         fprintf(stderr, "\t-h\t\tthis help\n");
 743         fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 744         fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
 745         fprintf(stderr, "\t-P\t\tcreate PID file " PID_FILE " in daemon mode\n");
 746         fprintf(stderr, "\t-p n\t\tlisten on port n (default: 1000)\n");
 747         fprintf(stderr, "\t-r n\t\treboot HM-CFG-USB after n seconds (0: no reboot, default: %u)\n", DEFAULT_REBOOT_SECONDS);
 748         fprintf(stderr, "\t   hh:mm\treboot HM-CFG-USB daily at hh:mm\n");
 749         fprintf(stderr, "\t-v\t\tverbose mode\n");
 750         fprintf(stderr, "\t-V\t\tshow version (" VERSION ")\n");
 751
 752 }
 753
 754 int main(int argc, char **argv)
 755 {
 756         int port = 1000;
 757         char *iface = NULL;
 758         int interactive = 0;
 759         int flags = 0;
 760         char *ep;
 761         int opt;
 762
 763         reboot_seconds = DEFAULT_REBOOT_SECONDS;
 764
 765         while((opt = getopt(argc, argv, "DdhiPp:Rr:l:vV")) != -1) {
 766                 switch (opt) {
 767                         case 'D':
 768                                 debug = 1;
 769                                 verbose = 1;
 770                                 break;
 771                         case 'd':
 772                                 flags |= FLAG_DAEMON;
 773                                 break;
 774                         case 'i':
 775                                 interactive = 1;
 776                                 break;
 777                         case 'P':
 778                                 flags |= FLAG_PID_FILE;
 779                                 break;
 780                         case 'p':
 781                                 port = strtoul(optarg, &ep, 10);
 782                                 if (*ep != '\0') {
 783                                         fprintf(stderr, "Can't parse port!\n");
 784                                         exit(EXIT_FAILURE);
 785                                 }
 786                                 break;
 787                         case 'R':
 788                                 fprintf(stderr, "-R is no longer needed (1s wakeup is default)\n");
 789                                 break;
 790                         case 'r':
 791                                 reboot_seconds = strtoul(optarg, &ep, 10);
 792                                 if (*ep != '\0') {
 793                                         if (*ep == ':') {
 794                                                 reboot_at_hour = reboot_seconds;
 795                                                 ep++;
 796                                                 reboot_at_minute = strtoul(ep, &ep, 10);
 797                                                 if (*ep != '\0') {
 798                                                         fprintf(stderr, "Can't parse reboot-time!\n");
 799                                                         exit(EXIT_FAILURE);
 800                                                 }
 801
 802                                                 reboot_seconds = 0;
 803                                         } else {
 804                                                 fprintf(stderr, "Can't parse reboot-timeout!\n");
 805                                                 exit(EXIT_FAILURE);
 806                                         }
 807                                 }
 808                                 break;
 809                         case 'l':
 810                                 iface = optarg;
 811                                 break;
 812                         case 'v':
 813                                 verbose = 1;
 814                                 break;
 815                         case 'V':
 816                                 printf("hmland " VERSION "\n");
 817                                 printf("Copyright (c) 2013 Michael Gernoth\n\n");
 818                                 exit(EXIT_SUCCESS);
 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 }