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 <netinet/in.h>
  36 #include <arpa/inet.h>
  37 #include <libusb-1.0/libusb.h>
  38
  39 #include "hexdump.h"
  40 #include "hmcfgusb.h"
  41
  42 extern char *optarg;
  43
  44 static int impersonate_hmlanif = 0;
  45 static int debug = 0;
  46 static int verbose = 0;
  47
  48 #define FLAG_LENGTH_BYTE        (1<<0)
  49 #define FLAG_FORMAT_HEX         (1<<1)
  50 #define FLAG_COMMA_BEFORE       (1<<2)
  51 #define FLAG_COMMA_AFTER        (1<<3)
  52 #define FLAG_NL                 (1<<4)
  53 #define FLAG_IGNORE_COMMAS      (1<<5)
  54
  55 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  56 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  57
  58 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  59 {
  60         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  61                 'A', 'B', 'C', 'D', 'E', 'F'};
  62         uint8_t *buf_out = *outpos;
  63         uint8_t *outend = *outpos + outlen;
  64         uint8_t *inend = *inpos + inlen;
  65         int i;
  66
  67         if (flags & FLAG_COMMA_BEFORE) {
  68                 CHECK_SPACE(1);
  69                 **outpos=',';
  70                 *outpos += 1;
  71         }
  72
  73         if (flags & FLAG_LENGTH_BYTE) {
  74                 CHECK_AVAIL(1);
  75                 len = **inpos;
  76                 *inpos += 1;
  77         }
  78
  79         if (flags & FLAG_FORMAT_HEX) {
  80                 CHECK_AVAIL(len);
  81                 CHECK_SPACE(len*2);
  82                 for (i = 0; i < len; i++) {
  83                         **outpos = nibble[((**inpos) & 0xf0) >> 4];
  84                         *outpos += 1;
  85                         **outpos = nibble[((**inpos) & 0xf)];
  86                         *inpos += 1; *outpos += 1;
  87                 }
  88         } else {
  89                 CHECK_AVAIL(len);
  90                 CHECK_SPACE(len);
  91                 memcpy(*outpos, *inpos, len);
  92                 *outpos += len;
  93                 *inpos += len;
  94         }
  95
  96         if (flags & FLAG_COMMA_AFTER) {
  97                 CHECK_SPACE(1);
  98                 **outpos=',';
  99                 *outpos += 1;
 100         }
 101
 102         if (flags & FLAG_NL) {
 103                 CHECK_SPACE(2);
 104                 **outpos='\r';
 105                 *outpos += 1;
 106                 **outpos='\n';
 107                 *outpos += 1;
 108         }
 109
 110         return *outpos - buf_out;
 111 }
 112
 113 static uint8_t ascii_to_nibble(uint8_t a)
 114 {
 115         uint8_t c = 0x00;
 116
 117         if ((a >= '0') && (a <= '9')) {
 118                 c = a - '0';
 119         } else if ((a >= 'A') && (a <= 'F')) {
 120                 c = (a - 'A') + 10;
 121         } else if ((a >= 'a') && (a <= 'f')) {
 122                 c = (a - 'a') + 10;
 123         }
 124
 125         return c;
 126 }
 127
 128 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 129 {
 130         uint8_t *buf_out = *outpos;
 131         uint8_t *outend = *outpos + outlen;
 132         uint8_t *inend = *inpos + inlen;
 133
 134         if (flags & FLAG_LENGTH_BYTE) {
 135                 int len = 0;
 136                 uint8_t *ip;
 137
 138                 ip = *inpos;
 139                 while(ip < inend) {
 140                         if (*ip == ',') {
 141                                 ip++;
 142                                 if (!(flags & FLAG_IGNORE_COMMAS))
 143                                         break;
 144
 145                                 continue;
 146                         }
 147                         len++;
 148                         ip++;
 149                 }
 150                 CHECK_SPACE(1);
 151                 **outpos = (len / 2);
 152                 *outpos += 1;
 153         }
 154
 155         while(*inpos < inend) {
 156                 if (**inpos == ',') {
 157                         *inpos += 1;
 158                         if (!(flags & FLAG_IGNORE_COMMAS))
 159                                 break;
 160
 161                         continue;
 162                 }
 163
 164                 CHECK_SPACE(1);
 165                 CHECK_AVAIL(2);
 166
 167                 **outpos = ascii_to_nibble(**inpos) << 4;
 168                 *inpos += 1;
 169                 **outpos |= ascii_to_nibble(**inpos);
 170                 *inpos += 1; *outpos += 1;
 171         }
 172
 173         return *outpos - buf_out;
 174 }
 175
 176 static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 177 {
 178         uint8_t out[1024];
 179         uint8_t *outpos;
 180         uint8_t *inpos;
 181         int fd = *((int*)data);
 182         int w;
 183
 184         if (buf_len < 1)
 185                 return 1;
 186
 187         memset(out, 0, sizeof(out));
 188         outpos = out;
 189         inpos = buf;
 190
 191         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 192         switch(buf[0]) {
 193                 case 'H':
 194                         if (impersonate_hmlanif) {
 195                                 buf[5] = 'L';
 196                                 buf[6] = 'A';
 197                                 buf[7] = 'N';
 198                         }
 199                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 200                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 201                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 202                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 203                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 204                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 205                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 206
 207                         break;
 208                 case 'E':
 209                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 210                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 211                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 212                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 213                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 214                         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);
 215
 216                         break;
 217                 case 'R':
 218                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 219                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 220                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 221                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 222                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 223                         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);
 224
 225                         break;
 226                 case 'I':
 227                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 228                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 229                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 230                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 231
 232                         break;
 233                 default:
 234                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 235                         hexdump(buf, buf_len, "Unknown> ");
 236                         break;
 237         }
 238         if (debug)
 239                 fprintf(stderr, "LAN < %s\n", out);
 240
 241         w = write(fd, out, outpos-out);
 242         if (w <= 0) {
 243                 perror("write");
 244                 return 0;
 245         }
 246
 247         return 1;
 248 }
 249
 250 static int hmlan_parse_in(int fd, void *data)
 251 {
 252         struct hmcfgusb_dev *dev = data;
 253         uint8_t buf[1025];
 254         uint8_t out[0x40]; //FIXME!!!
 255         uint8_t *outpos;
 256         uint8_t *inpos;
 257         int i;
 258         int last;
 259         int r;
 260
 261         memset(buf, 0, sizeof(buf));
 262
 263         r = read(fd, buf, sizeof(buf)-1);
 264         if (r > 0) {
 265                 uint8_t *inend = buf + r;
 266
 267                 inpos = buf;
 268
 269                 if (debug)
 270                         fprintf(stderr, "\nLAN > %s", buf);
 271
 272                 while (inpos < inend) {
 273                         uint8_t *instart = inpos;
 274
 275                         if ((*inpos == '\r') || (*inpos == '\n')) {
 276                                 inpos++;
 277                                 continue;
 278                         }
 279
 280                         outpos = out;
 281
 282                         last = inend - inpos;
 283
 284                         for (i = 0; i < last; i++) {
 285                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 286                                         last = i;
 287                                         break;
 288                                 }
 289                         }
 290
 291                         if (last == 0)
 292                                 continue;
 293
 294                         memset(out, 0, sizeof(out));
 295                         *outpos++ = *inpos++;
 296
 297                         switch(buf[0]) {
 298                                 case 'S':
 299                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 300                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 301                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 302                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 303                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 304                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 305                                         break;
 306                                 default:
 307                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 308                                         break;
 309                         }
 310
 311                         hmcfgusb_send(dev, out, sizeof(out), 1);
 312                 }
 313         } else if (r < 0) {
 314                 perror("read");
 315                 return r;
 316         } else {
 317                 return 0;
 318         }
 319
 320         return 1;
 321 }
 322
 323 static int comm(int fd_in, int fd_out, int master_socket)
 324 {
 325         struct hmcfgusb_dev *dev;
 326         int quit = 0;
 327
 328         hmcfgusb_set_debug(debug);
 329
 330         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 331         if (!dev) {
 332                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 333                 return 0;
 334         }
 335
 336         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 337                 fprintf(stderr, "Can't add client to pollfd!\n");
 338                 hmcfgusb_close(dev);
 339                 return 0;
 340         }
 341
 342         if (master_socket >= 0) {
 343                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 344                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 345                         hmcfgusb_close(dev);
 346                         return 0;
 347                 }
 348         }
 349
 350         hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
 351
 352         while(!quit) {
 353                 int fd;
 354
 355                 fd = hmcfgusb_poll(dev, 3600);
 356                 if (fd >= 0) {
 357                         if (fd == master_socket) {
 358                                 int client;
 359
 360                                 client = accept(master_socket, NULL, 0);
 361                                 if (client >= 0) {
 362                                         shutdown(client, SHUT_RDWR);
 363                                         close(client);
 364                                 }
 365                         } else {
 366                                 if (hmlan_parse_in(fd, dev) <= 0) {
 367                                         quit = 1;
 368                                 }
 369                         }
 370                 } else if (fd == -1) {
 371                         if (errno) {
 372                                 perror("hmcfgusb_poll");
 373                                 quit = 1;
 374                         }
 375                 }
 376         }
 377
 378         hmcfgusb_close(dev);
 379         return 1;
 380 }
 381
 382 static int socket_server(int port, int daemon)
 383 {
 384         struct sigaction sact;
 385         struct sockaddr_in sin;
 386         int sock;
 387         int n;
 388         pid_t pid;
 389
 390         if (daemon) {
 391                 pid = fork();
 392                 if (pid > 0) {
 393                         printf("Daemon with PID %u started!\n", pid);
 394                         exit(EXIT_SUCCESS);
 395                 } else if (pid < 0) {
 396                         perror("fork");
 397                         exit(EXIT_FAILURE);
 398                 }
 399         }
 400
 401         memset(&sact, 0, sizeof(sact));
 402         sact.sa_handler = SIG_IGN;
 403
 404         if (sigaction(SIGPIPE, &sact, NULL) == -1) {
 405                 perror("sigaction");
 406         }
 407
 408         impersonate_hmlanif = 1;
 409
 410         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 411         if (sock == -1) {
 412                 perror("Can't open socket");
 413                 return EXIT_FAILURE;
 414         }
 415
 416         n = 1;
 417         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 418                 perror("Can't set socket options");
 419                 return EXIT_FAILURE;
 420         }
 421
 422         memset(&sin, 0, sizeof(sin));
 423         sin.sin_family = AF_INET;
 424         sin.sin_port = htons(port);
 425         sin.sin_addr.s_addr = htonl(INADDR_ANY);
 426
 427         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 428                 perror("Can't bind socket");
 429                 return EXIT_FAILURE;
 430         }
 431
 432         if (listen(sock, 1) == -1) {
 433                 perror("Can't listen on socket");
 434                 return EXIT_FAILURE;
 435         }
 436
 437         while(1) {
 438                 struct sockaddr_in csin;
 439                 socklen_t csinlen;
 440                 int client;
 441                 in_addr_t client_addr;
 442
 443                 memset(&csin, 0, sizeof(csin));
 444                 csinlen = sizeof(csin);
 445                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 446                 if (client == -1) {
 447                         perror("Couldn't accept client");
 448                         continue;
 449                 }
 450
 451                 /* FIXME: getnameinfo... */
 452                 client_addr = ntohl(csin.sin_addr.s_addr);
 453
 454                 if (verbose) {
 455                         printf("Client %d.%d.%d.%d connected!\n",
 456                                         (client_addr & 0xff000000) >> 24,
 457                                         (client_addr & 0x00ff0000) >> 16,
 458                                         (client_addr & 0x0000ff00) >> 8,
 459                                         (client_addr & 0x000000ff));
 460                 }
 461
 462                 comm(client, client, sock);
 463
 464                 shutdown(client, SHUT_RDWR);
 465                 close(client);
 466
 467                 if (verbose) {
 468                         printf("Connection to %d.%d.%d.%d closed!\n",
 469                                         (client_addr & 0xff000000) >> 24,
 470                                         (client_addr & 0x00ff0000) >> 16,
 471                                         (client_addr & 0x0000ff00) >> 8,
 472                                         (client_addr & 0x000000ff));
 473                 }
 474
 475         }
 476
 477         return EXIT_SUCCESS;
 478 }
 479
 480 static int interactive_server(void)
 481 {
 482         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1))
 483                 return EXIT_FAILURE;
 484
 485         return EXIT_SUCCESS;
 486 }
 487
 488 void hmlan_syntax(char *prog)
 489 {
 490         fprintf(stderr, "Syntax: %s options\n\n", prog);
 491         fprintf(stderr, "Possible options:\n");
 492         fprintf(stderr, "\t-D\tdebug mode\n");
 493         fprintf(stderr, "\t-d\tdaemon mode\n");
 494         fprintf(stderr, "\t-h\tthis help\n");
 495         fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 496         fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
 497         fprintf(stderr, "\t-v\tverbose mode\n");
 498
 499 }
 500
 501 int main(int argc, char **argv)
 502 {
 503         int port = 1000;
 504         int interactive = 0;
 505         int daemon = 0;
 506         char *ep;
 507         int opt;
 508
 509         while((opt = getopt(argc, argv, "Ddhip:v")) != -1) {
 510                 switch (opt) {
 511                         case 'D':
 512                                 debug = 1;
 513                                 verbose = 1;
 514                                 break;
 515                         case 'd':
 516                                 daemon = 1;
 517                                 break;
 518                         case 'i':
 519                                 interactive = 1;
 520                                 break;
 521                         case 'p':
 522                                 port = strtoul(optarg, &ep, 10);
 523                                 if (*ep != '\0') {
 524                                         fprintf(stderr, "Can't parse port!\n");
 525                                         exit(EXIT_FAILURE);
 526                                 }
 527                                 break;
 528                         case 'v':
 529                                 verbose = 1;
 530                                 break;
 531                         case 'h':
 532                         case ':':
 533                         case '?':
 534                         default:
 535                                 hmlan_syntax(argv[0]);
 536                                 exit(EXIT_FAILURE);
 537                                 break;
 538                 }
 539         }
 540
 541         if (interactive) {
 542                 return interactive_server();
 543         } else {
 544                 return socket_server(port, daemon);
 545         }
 546 }