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 static int impersonate_hmlanif = 0;
  42
  43 #define FLAG_LENGTH_BYTE        (1<<0)
  44 #define FLAG_FORMAT_HEX         (1<<1)
  45 #define FLAG_COMMA_BEFORE       (1<<2)
  46 #define FLAG_COMMA_AFTER        (1<<3)
  47 #define FLAG_NL                 (1<<4)
  48 #define FLAG_IGNORE_COMMAS      (1<<5)
  49
  50 #define CHECK_SPACE(x)          if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
  51 #define CHECK_AVAIL(x)          if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
  52
  53 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
  54 {
  55         uint8_t *buf_out = *outpos;
  56         uint8_t *outend = *outpos + outlen;
  57         uint8_t *inend = *inpos + inlen;
  58         int i;
  59
  60         if (flags & FLAG_COMMA_BEFORE) {
  61                 CHECK_SPACE(1);
  62                 **outpos=',';
  63                 *outpos += 1;
  64         }
  65
  66         if (flags & FLAG_LENGTH_BYTE) {
  67                 CHECK_AVAIL(1);
  68                 len = **inpos;
  69                 *inpos += 1;
  70         }
  71
  72         if (flags & FLAG_FORMAT_HEX) {
  73                 char hex[3];
  74
  75                 memset(hex, 0, sizeof(hex));
  76
  77                 CHECK_AVAIL(len);
  78                 CHECK_SPACE(len*2);
  79                 for (i = 0; i < len; i++) {
  80                         if (snprintf(hex, sizeof(hex), "%02X", **inpos) != 2) {
  81                                 fprintf(stderr, "Can't format hex-string!\n");
  82                                 return 0;
  83                         }
  84                         *inpos += 1;
  85                         memcpy(*outpos, hex, 2);
  86                         *outpos += 2;
  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 int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 114 {
 115         uint8_t *buf_out = *outpos;
 116         uint8_t *outend = *outpos + outlen;
 117         uint8_t *inend = *inpos + inlen;
 118         char hex[3];
 119
 120         memset(hex, 0, sizeof(hex));
 121
 122         if (flags & FLAG_LENGTH_BYTE) {
 123                 int len = 0;
 124                 uint8_t *ip;
 125
 126                 ip = *inpos;
 127                 while(ip < inend) {
 128                         if (*ip == ',') {
 129                                 ip++;
 130                                 if (!(flags & FLAG_IGNORE_COMMAS))
 131                                         break;
 132
 133                                 continue;
 134                         }
 135                         len++;
 136                         ip++;
 137                 }
 138                 CHECK_SPACE(1);
 139                 **outpos = (len / 2);
 140                 *outpos += 1;
 141         }
 142
 143         while(*inpos < inend) {
 144                 if (**inpos == ',') {
 145                         *inpos += 1;
 146                         if (!(flags & FLAG_IGNORE_COMMAS))
 147                                 break;
 148
 149                         continue;
 150                 }
 151
 152                 CHECK_SPACE(1);
 153                 CHECK_AVAIL(2);
 154                 memcpy(hex, *inpos, 2);
 155                 *inpos += 2;
 156
 157                 **outpos = strtoul(hex, NULL, 16);
 158                 *outpos += 1;
 159         }
 160
 161         return *outpos - buf_out;
 162 }
 163
 164 static void hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 165 {
 166         uint8_t out[1024];
 167         uint8_t *outpos;
 168         uint8_t *inpos;
 169         int fd = *((int*)data);
 170
 171         if (buf_len < 1)
 172                 return;
 173
 174         memset(out, 0, sizeof(out));
 175         outpos = out;
 176         inpos = buf;
 177
 178         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
 179         switch(buf[0]) {
 180                 case 'H':
 181                         if (impersonate_hmlanif) {
 182                                 buf[5] = 'L';
 183                                 buf[6] = 'A';
 184                                 buf[7] = 'N';
 185                         }
 186                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
 187                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 188                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
 189                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 190                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 191                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 192                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 193
 194                         break;
 195                 case 'E':
 196                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
 197                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 198                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 199                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 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_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE | FLAG_NL);
 202
 203                         break;
 204                 case 'R':
 205                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
 206                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 207                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 208                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 209                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 210                         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);
 211
 212                         break;
 213                 case 'I':
 214                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
 215                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 216                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
 217                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 218
 219                         break;
 220                 default:
 221                         format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
 222                         hexdump(buf, buf_len, "Unknown> ");
 223                         break;
 224         }
 225         write(fd, out, outpos-out);
 226 }
 227
 228 static int hmlan_parse_in(int fd, void *data)
 229 {
 230         struct hmcfgusb_dev *dev = data;
 231         uint8_t buf[1024];
 232         uint8_t out[0x40]; //FIXME!!!
 233         uint8_t *outpos;
 234         uint8_t *inpos;
 235         int i;
 236         int r;
 237
 238         r = read(fd, buf, sizeof(buf));
 239         if (r > 0) {
 240                 memset(out, 0, sizeof(out));
 241                 for (i = 0; i < r; i++) {
 242                         if ((buf[i] == 0x0a) ||
 243                                         (buf[i] == 0x0d)) {
 244                                 r = i;
 245                                 break;
 246                         }
 247                 }
 248
 249                 if (r == 0)
 250                         return 1;
 251
 252                 out[0] = buf[0];
 253                 outpos = out+1;
 254                 inpos = buf+1;
 255
 256                 switch(buf[0]) {
 257                         case 'S':
 258                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
 259                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
 260                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
 261                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
 262                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
 263                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
 264                                 break;
 265                         default:
 266                                 parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
 267                                 break;
 268                 }
 269
 270                 hmcfgusb_send(dev, out, outpos-out, 1);
 271         } else if (r < 0) {
 272                 perror("read");
 273                 return r;
 274         } else {
 275                 return 0;
 276         }
 277
 278         return 1;
 279 }
 280
 281 static int comm(int fd_in, int fd_out, int master_socket)
 282 {
 283         struct hmcfgusb_dev *dev;
 284         int quit = 0;
 285
 286         dev = hmcfgusb_init(hmlan_format_out, &fd_out);
 287         if (!dev) {
 288                 fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
 289                 return 0;
 290         }
 291
 292         if (!hmcfgusb_add_pfd(dev, fd_in, POLLIN)) {
 293                 fprintf(stderr, "Can't add client to pollfd!\n");
 294                 hmcfgusb_close(dev);
 295                 return 0;
 296         }
 297
 298         if (master_socket >= 0) {
 299                 if (!hmcfgusb_add_pfd(dev, master_socket, POLLIN)) {
 300                         fprintf(stderr, "Can't add master_socket to pollfd!\n");
 301                         hmcfgusb_close(dev);
 302                         return 0;
 303                 }
 304         }
 305
 306         hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
 307
 308         while(!quit) {
 309                 int fd;
 310
 311                 fd = hmcfgusb_poll(dev, 3600);
 312                 if (fd >= 0) {
 313                         if (fd == master_socket) {
 314                                 int client;
 315
 316                                 client = accept(master_socket, NULL, 0);
 317                                 if (client >= 0) {
 318                                         shutdown(client, SHUT_RDWR);
 319                                         close(client);
 320                                 }
 321                         } else {
 322                                 if (hmlan_parse_in(fd, dev) <= 0) {
 323                                         quit = 1;
 324                                 }
 325                         }
 326                 } else if (fd == -1) {
 327                         if (errno) {
 328                                 perror("hmcfgusb_poll");
 329                                 quit = 1;
 330                         }
 331                 }
 332         }
 333
 334         hmcfgusb_close(dev);
 335         return 1;
 336 }
 337
 338 static int socket_server(int port)
 339 {
 340         struct sockaddr_in sin;
 341         int sock;
 342         int n;
 343
 344         impersonate_hmlanif = 1;
 345
 346         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 347         if (sock == -1) {
 348                 perror("Can't open socket");
 349                 return EXIT_FAILURE;
 350         }
 351
 352         n = 1;
 353         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
 354                 perror("Can't set socket options");
 355                 return EXIT_FAILURE;
 356         }
 357
 358         memset(&sin, 0, sizeof(sin));
 359         sin.sin_family = AF_INET;
 360         sin.sin_port = htons(port);
 361         sin.sin_addr.s_addr = htonl(INADDR_ANY);
 362
 363         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 364                 perror("Can't bind socket");
 365                 return EXIT_FAILURE;
 366         }
 367
 368         if (listen(sock, 1) == -1) {
 369                 perror("Can't listen on socket");
 370                 return EXIT_FAILURE;
 371         }
 372
 373         while(1) {
 374                 struct sockaddr_in csin;
 375                 socklen_t csinlen;
 376                 int client;
 377
 378                 memset(&csin, 0, sizeof(csin));
 379                 csinlen = sizeof(csin);
 380                 client = accept(sock, (struct sockaddr*)&csin, &csinlen);
 381                 if (client == -1) {
 382                         perror("Couldn't accept client");
 383                         continue;
 384                 }
 385
 386                 printf("Client accepted!\n");
 387
 388                 comm(client, client, sock);
 389
 390                 shutdown(client, SHUT_RDWR);
 391                 close(client);
 392
 393                 printf("Connection closed!\n");
 394
 395         }
 396
 397         return EXIT_SUCCESS;
 398 }
 399
 400 static int interactive_server(void)
 401 {
 402         if (!comm(STDIN_FILENO, STDOUT_FILENO, -1))
 403                 return EXIT_FAILURE;
 404
 405         return EXIT_SUCCESS;
 406 }
 407
 408 int main(int argc, char **argv)
 409 {
 410         //return interactive_server();
 411         return socket_server(1234);
 412 }