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

   1 /* HM-CFG-LAN emuldation 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         uint8_t *buf_out = *outpos;
  60         uint8_t *outend = *outpos + outlen;
  61         uint8_t *inend = *inpos + inlen;
  62         int i;
  63
  64         if (flags & FLAG_COMMA_BEFORE) {
  65                 CHECK_SPACE(1);
  66                 **outpos=',';
  67                 *outpos += 1;
  68         }
  69
  70         if (flags & FLAG_LENGTH_BYTE) {
  71                 CHECK_AVAIL(1);
  72                 len = **inpos;
  73                 *inpos += 1;
  74         }
  75
  76         if (flags & FLAG_FORMAT_HEX) {
  77                 char hex[3];
  78
  79                 memset(hex, 0, sizeof(hex));
  80
  81                 CHECK_AVAIL(len);
  82                 CHECK_SPACE(len*2);
  83                 for (i = 0; i < len; i++) {
  84                         if (snprintf(hex, sizeof(hex), "%02X", **inpos) != 2) {
  85                                 fprintf(stderr, "Can't format hex-string!\n");
  86                                 return 0;
  87                         }
  88                         *inpos += 1;
  89                         memcpy(*outpos, hex, 2);
  90                         *outpos += 2;
  91                 }
  92         } else {
  93                 CHECK_AVAIL(len);
  94                 CHECK_SPACE(len);
  95                 memcpy(*outpos, *inpos, len);
  96                 *outpos += len;
  97                 *inpos += len;
  98         }
  99
 100         if (flags & FLAG_COMMA_AFTER) {
 101                 CHECK_SPACE(1);
 102                 **outpos=',';
 103                 *outpos += 1;
 104         }
 105
 106         if (flags & FLAG_NL) {
 107                 CHECK_SPACE(2);
 108                 **outpos='\r';
 109                 *outpos += 1;
 110                 **outpos='\n';
 111                 *outpos += 1;
 112         }
 113
 114         return *outpos - buf_out;
 115 }
 116
 117 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 118 {
 119         uint8_t *buf_out = *outpos;
 120         uint8_t *outend = *outpos + outlen;
 121         uint8_t *inend = *inpos + inlen;
 122         char hex[3];
 123
 124         memset(hex, 0, sizeof(hex));
 125
 126         if (flags & FLAG_LENGTH_BYTE) {
 127                 int len = 0;
 128                 uint8_t *ip;
 129
 130                 ip = *inpos;
 131                 while(ip < inend) {
 132                         if (*ip == ',') {
 133                                 ip++;
 134                                 if (!(flags & FLAG_IGNORE_COMMAS))
 135                                         break;
 136
 137                                 continue;
 138                         }
 139                         len++;
 140                         ip++;
 141                 }
 142                 CHECK_SPACE(1);
 143                 **outpos = (len / 2);
 144                 *outpos += 1;
 145         }
 146
 147         while(*inpos < inend) {
 148                 if (**inpos == ',') {
 149                         *inpos += 1;
 150                         if (!(flags & FLAG_IGNORE_COMMAS))
 151                                 break;
 152
 153                         continue;
 154                 }
 155
 156                 CHECK_SPACE(1);
 157                 CHECK_AVAIL(2);
 158                 memcpy(hex, *inpos, 2);
 159                 *inpos += 2;
 160
 161                 **outpos = strtoul(hex, NULL, 16);
 162                 *outpos += 1;
 163         }
 164
 165         return *outpos - buf_out;
 166 }
 167
 168 static void hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 169 {
 170         uint8_t out[1024];
 171         uint8_t *outpos;
 172         uint8_t *inpos;
 173         int fd = *((int*)data);
 174
 175         if (buf_len < 1)
 176                 return;
 177
 178         memset(out, 0, sizeof(out));
 179         outpos = out;
 180         inpos = buf;
 181
 182         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 183         switch(buf[0]) {
 184                 case 'H':
 185                         if (impersonate_hmlanif) {
 186                                 buf[5] = 'L';
 187                                 buf[6] = 'A';
 188                                 buf[7] = 'N';
 189                         }
 190                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 191                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 192                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 193                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 194                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 195                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 196                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 197
 198                         break;
 199                 case 'E':
 200                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 201                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, 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)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 204                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 205                         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);
 206
 207                         break;
 208                 case 'R':
 209                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, 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 'I':
 218                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 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)), 1, 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 | FLAG_NL);
 222
 223                         break;
 224                 default:
 225                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 226                         hexdump(buf, buf_len, "Unknown> ");
 227                         break;
 228         }
 229         write(fd, out, outpos-out);
 230         if (debug)
 231                 fprintf(stderr, "LAN < %s\n", out);
 232 }
 233
 234 static int hmlan_parse_in(int fd, void *data)
 235 {
 236         struct hmcfgusb_dev *dev = data;
 237         uint8_t buf[1025];
 238         uint8_t out[0x40]; //FIXME!!!
 239         uint8_t *outpos;
 240         uint8_t *inpos;
 241         int i;
 242         int last;
 243         int r;
 244
 245         memset(buf, 0, sizeof(buf));
 246
 247         r = read(fd, buf, sizeof(buf)-1);
 248         if (r > 0) {
 249                 uint8_t *inend = buf + r;
 250
 251                 inpos = buf;
 252
 253                 if (debug)
 254                         fprintf(stderr, "LAN > %s\n", buf);
 255
 256                 while (inpos < inend) {
 257                         uint8_t *instart = inpos;
 258
 259                         if ((*inpos == '\r') || (*inpos == '\n')) {
 260                                 inpos++;
 261                                 continue;
 262                         }
 263
 264                         outpos = out;
 265
 266                         last = inend - inpos;
 267
 268                         for (i = 0; i < last; i++) {
 269                                 if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
 270                                         last = i;
 271                                         break;
 272                                 }
 273                         }
 274
 275                         if (last == 0)
 276                                 continue;
 277
 278                         memset(out, 0, sizeof(out));
 279                         *outpos++ = *inpos++;
 280
 281                         switch(buf[0]) {
 282                                 case 'S':
 283                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 284                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 285                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 286                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 287                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
 288                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 289                                         break;
 290                                 default:
 291                                         parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 292                                         break;
 293                         }
 294
 295                         hmcfgusb_send(dev, out, sizeof(out), 1);
 296                 }
 297         } else if (r < 0) {
 298                 perror("read");
 299                 return r;
 300         } else {
 301                 return 0;
 302         }
 303
 304         return 1;
 305 }
 306
 307 static int comm(int fd_in, int fd_out, int master_socket)
 308 {
 309         struct hmcfgusb_dev *dev;
 310         int quit = 0;
 311
 312         hmcfgusb_set_debug(debug);
 313
 314         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 315         if (!dev) {
 316                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 317                 return 0;
 318         }
 319
 320         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 321                 fprintf(stderr, "Can't add client to pollfd!\n");
 322                 hmcfgusb_close(dev);
 323                 return 0;
 324         }
 325
 326         if (master_socket >= 0) {
 327                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 328                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 329                         hmcfgusb_close(dev);
 330                         return 0;
 331                 }
 332         }
 333
 334         hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
 335
 336         while(!quit) {
 337                 int fd;
 338
 339                 fd = hmcfgusb_poll(dev, 3600);
 340                 if (fd >= 0) {
 341                         if (fd == master_socket) {
 342                                 int client;
 343
 344                                 client = accept(master_socket, NULL, 0);
 345                                 if (client >= 0) {
 346                                         shutdown(client, SHUT_RDWR);
 347                                         close(client);
 348                                 }
 349                         } else {
 350                                 if (hmlan_parse_in(fd, dev) <= 0) {
 351                                         quit = 1;
 352                                 }
 353                         }
 354                 } else if (fd == -1) {
 355                         if (errno) {
 356                                 perror("hmcfgusb_poll");
 357                                 quit = 1;
 358                         }
 359                 }
 360         }
 361
 362         hmcfgusb_close(dev);
 363         return 1;
 364 }
 365
 366 static int socket_server(int port, int daemon)
 367 {
 368         struct sockaddr_in sin;
 369         int sock;
 370         int n;
 371         pid_t pid;
 372
 373         if (daemon) {
 374                 pid = fork();
 375                 if (pid > 0) {
 376                         printf("Daemon with PID %u started!\n", pid);
 377                         exit(EXIT_SUCCESS);
 378                 } else if (pid < 0) {
 379                         perror("fork");
 380                         exit(EXIT_FAILURE);
 381                 }
 382         }
 383
 384         impersonate_hmlanif = 1;
 385
 386         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 387         if (sock == -1) {
 388                 perror("Can't open socket");
 389                 return EXIT_FAILURE;
 390         }
 391
 392         n = 1;
 393         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 394                 perror("Can't set socket options");
 395                 return EXIT_FAILURE;
 396         }
 397
 398         memset(&sin, 0, sizeof(sin));
 399         sin.sin_family = AF_INET;
 400         sin.sin_port = htons(port);
 401         sin.sin_addr.s_addr = htonl(INADDR_ANY);
 402
 403         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 404                 perror("Can't bind socket");
 405                 return EXIT_FAILURE;
 406         }
 407
 408         if (listen(sock, 1) == -1) {
 409                 perror("Can't listen on socket");
 410                 return EXIT_FAILURE;
 411         }
 412
 413         while(1) {
 414                 struct sockaddr_in csin;
 415                 socklen_t csinlen;
 416                 int client;
 417                 in_addr_t client_addr;
 418
 419                 memset(&csin, 0, sizeof(csin));
 420                 csinlen = sizeof(csin);
 421                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 422                 if (client == -1) {
 423                         perror("Couldn't accept client");
 424                         continue;
 425                 }
 426
 427                 /* FIXME: getnameinfo... */
 428                 client_addr = ntohl(csin.sin_addr.s_addr);
 429
 430                 if (verbose) {
 431                         printf("Client %d.%d.%d.%d connected!\n",
 432                                         (client_addr & 0xff000000) >> 24,
 433                                         (client_addr & 0x00ff0000) >> 16,
 434                                         (client_addr & 0x0000ff00) >> 8,
 435                                         (client_addr & 0x000000ff));
 436                 }
 437
 438                 comm(client, client, sock);
 439
 440                 shutdown(client, SHUT_RDWR);
 441                 close(client);
 442
 443                 if (verbose) {
 444                         printf("Connection to %d.%d.%d.%d closed!\n",
 445                                         (client_addr & 0xff000000) >> 24,
 446                                         (client_addr & 0x00ff0000) >> 16,
 447                                         (client_addr & 0x0000ff00) >> 8,
 448                                         (client_addr & 0x000000ff));
 449                 }
 450
 451         }
 452
 453         return EXIT_SUCCESS;
 454 }
 455
 456 static int interactive_server(void)
 457 {
 458         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1))
 459                 return EXIT_FAILURE;
 460
 461         return EXIT_SUCCESS;
 462 }
 463
 464 void hmlan_syntax(char *prog)
 465 {
 466         fprintf(stderr, "Syntax: %s options\n\n", prog);
 467         fprintf(stderr, "Possible options:\n");
 468         fprintf(stderr, "\t-D\tdebug mode\n");
 469         fprintf(stderr, "\t-d\tdaemon mode\n");
 470         fprintf(stderr, "\t-h\tthis help\n");
 471         fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
 472         fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
 473         fprintf(stderr, "\t-v\tverbose mode\n");
 474
 475 }
 476
 477 int main(int argc, char **argv)
 478 {
 479         int port = 1000;
 480         int interactive = 0;
 481         int daemon = 0;
 482         char *ep;
 483         int opt;
 484
 485         while((opt = getopt(argc, argv, "Ddhip:v")) != -1) {
 486                 switch (opt) {
 487                         case 'D':
 488                                 debug = 1;
 489                                 verbose = 1;
 490                                 break;
 491                         case 'd':
 492                                 daemon = 1;
 493                                 break;
 494                         case 'i':
 495                                 interactive = 1;
 496                                 break;
 497                         case 'p':
 498                                 port = strtoul(optarg, &ep, 10);
 499                                 if (*ep != '\0') {
 500                                         fprintf(stderr, "Can't parse port!\n");
 501                                         exit(EXIT_FAILURE);
 502                                 }
 503                                 break;
 504                         case 'v':
 505                                 verbose = 1;
 506                                 break;
 507                         case 'h':
 508                         case ':':
 509                         case '?':
 510                         default:
 511                                 hmlan_syntax(argv[0]);
 512                                 exit(EXIT_FAILURE);
 513                                 break;
 514                 }
 515         }
 516
 517         if (interactive) {
 518                 return interactive_server();
 519         } else {
 520                 return socket_server(port, daemon);
 521         }
 522 }