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