cansniffer.c

   1 /*
   2  * can-sniffer.c
   3  *
   4  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of Volkswagen nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * Alternatively, provided that this notice is retained in full, this
  20  * software may be distributed under the terms of the GNU General
  21  * Public License ("GPL") version 2, in which case the provisions of the
  22  * GPL apply INSTEAD OF those given above.
  23  *
  24  * The provided data structures and external interfaces from this code
  25  * are not restricted to be used by modules with a GPL compatible license.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  31  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  32  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  33  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  37  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  38  * DAMAGE.
  39  *
  40  * Send feedback to <linux-can@vger.kernel.org>
  41  *
  42  */
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47 #include <string.h>
  48 #include <fcntl.h>
  49 #include <signal.h>
  50 #include <ctype.h>
  51 #include <libgen.h>
  52 #include <time.h>
  53
  54 #include <sys/time.h>
  55 #include <sys/types.h>
  56 #include <sys/stat.h>
  57 #include <sys/socket.h>
  58 #include <sys/ioctl.h>
  59 #include <sys/uio.h>
  60 #include <net/if.h>
  61
  62 #include <linux/can.h>
  63 #include <linux/can/bcm.h>
  64
  65 #include "terminal.h"
  66
  67 #define U64_DATA(p) (*(unsigned long long*)(p)->data)
  68
  69 #define SETFNAME "sniffset."
  70 #define ANYDEV   "any"
  71
  72 /* flags */
  73
  74 #define ENABLE  1 /* by filter or user */
  75 #define DISPLAY 2 /* is on the screen */
  76 #define UPDATE  4 /* needs to be printed on the screen */
  77 #define CLRSCR  8 /* clear screen in next loop */
  78
  79 /* flags testing & setting */
  80
  81 #define is_set(id, flag) (sniftab[id].flags & flag)
  82 #define is_clr(id, flag) (!(sniftab[id].flags & flag))
  83
  84 #define do_set(id, flag) (sniftab[id].flags |= flag)
  85 #define do_clr(id, flag) (sniftab[id].flags &= ~flag)
  86
  87 /* time defaults */
  88
  89 #define TIMEOUT 50 /* in 100ms */
  90 #define HOLD    10 /* in 100ms */
  91 #define LOOP     2 /* in 100ms */
  92
  93 #define MAXANI 8
  94 const char anichar[MAXANI] = {'|', '/', '-', '\\', '|', '/', '-', '\\'};
  95
  96 #define ATTCOLOR ATTBOLD FGRED
  97
  98 #define STARTLINESTR "X  time    ID  data ... "
  99
 100 struct snif {
 101         int flags;
 102         long hold;
 103         long timeout;
 104         struct timeval laststamp;
 105         struct timeval currstamp;
 106         struct can_frame last;
 107         struct can_frame current;
 108         struct can_frame marker;
 109         struct can_frame notch;
 110 } sniftab[2048];
 111
 112
 113 extern int optind, opterr, optopt;
 114
 115 static int running = 1;
 116 static int clearscreen = 1;
 117 static int notch;
 118 static int filter_id_only;
 119 static long timeout = TIMEOUT;
 120 static long hold = HOLD;
 121 static long loop = LOOP;
 122 static unsigned char binary;
 123 static unsigned char binary_gap;
 124 static unsigned char color;
 125 static char *interface;
 126
 127 void rx_setup (int fd, int id);
 128 void rx_delete (int fd, int id);
 129 void print_snifline(int id);
 130 int handle_keyb(int fd);
 131 int handle_bcm(int fd, long currcms);
 132 int handle_timeo(int fd, long currcms);
 133 void writesettings(char* name);
 134 void readsettings(char* name, int sockfd);
 135
 136 void print_usage(char *prg)
 137 {
 138         const char manual [] = {
 139                 "commands that can be entered at runtime:\n"
 140                 "\n"
 141                 "q<ENTER>       - quit\n"
 142                 "b<ENTER>       - toggle binary / HEX-ASCII output\n"
 143                 "B<ENTER>       - toggle binary with gap / HEX-ASCII output (exceeds 80 chars!)\n"
 144                 "c<ENTER>       - toggle color mode\n"
 145                 "#<ENTER>       - notch currently marked/changed bits (can be used repeatedly)\n"
 146                 "*<ENTER>       - clear notched marked\n"
 147                 "rMYNAME<ENTER> - read settings file (filter/notch)\n"
 148                 "wMYNAME<ENTER> - write settings file (filter/notch)\n"
 149                 "+FILTER<ENTER> - add CAN-IDs to sniff\n"
 150                 "-FILTER<ENTER> - remove CAN-IDs to sniff\n"
 151                 "\n"
 152                 "FILTER can be a single CAN-ID or a CAN-ID/Bitmask:\n"
 153                 "+1F5<ENTER>    - add CAN-ID 0x1F5\n"
 154                 "-42E<ENTER>    - remove CAN-ID 0x42E\n"
 155                 "-42E7FF<ENTER> - remove CAN-ID 0x42E (using Bitmask)\n"
 156                 "-500700<ENTER> - remove CAN-IDs 0x500 - 0x5FF\n"
 157                 "+400600<ENTER> - add CAN-IDs 0x400 - 0x5FF\n"
 158                 "+000000<ENTER> - add all CAN-IDs\n"
 159                 "-000000<ENTER> - remove all CAN-IDs\n"
 160                 "\n"
 161                 "if (id & filter) == (sniff-id & filter) the action (+/-) is performed,\n"
 162                 "which is quite easy when the filter is 000\n"
 163                 "\n"
 164         };
 165
 166         fprintf(stderr, "\nUsage: %s [can-interface]\n", prg);
 167         fprintf(stderr, "Options: -m <mask>  (initial FILTER default 0x00000000)\n");
 168         fprintf(stderr, "         -v <value> (initial FILTER default 0x00000000)\n");
 169         fprintf(stderr, "         -q         (quiet - all IDs deactivated)\n");
 170         fprintf(stderr, "         -r <name>  (read %sname from file)\n", SETFNAME);
 171         fprintf(stderr, "         -b         (start with binary mode)\n");
 172         fprintf(stderr, "         -B         (start with binary mode with gap - exceeds 80 chars!)\n");
 173         fprintf(stderr, "         -c         (color changes)\n");
 174         fprintf(stderr, "         -f         (filter on CAN-ID only)\n");
 175         fprintf(stderr, "         -t <time>  (timeout for ID display [x100ms] default: %d, 0 = OFF)\n", TIMEOUT);
 176         fprintf(stderr, "         -h <time>  (hold marker on changes [x100ms] default: %d)\n", HOLD);
 177         fprintf(stderr, "         -l <time>  (loop time (display) [x100ms] default: %d)\n", LOOP);
 178         fprintf(stderr, "Use interface name '%s' to receive from all can-interfaces\n", ANYDEV);
 179         fprintf(stderr, "\n");
 180         fprintf(stderr, "%s", manual);
 181 }
 182
 183 void sigterm(int signo)
 184 {
 185         running = 0;
 186 }
 187
 188 int main(int argc, char **argv)
 189 {
 190         fd_set rdfs;
 191         int s;
 192         canid_t mask = 0;
 193         canid_t value = 0;
 194         long currcms = 0;
 195         long lastcms = 0;
 196         unsigned char quiet = 0;
 197         int opt, ret;
 198         struct timeval timeo, start_tv, tv;
 199         struct sockaddr_can addr;
 200         struct ifreq ifr;
 201         int i;
 202
 203
 204         signal(SIGTERM, sigterm);
 205         signal(SIGHUP, sigterm);
 206         signal(SIGINT, sigterm);
 207
 208         for (i=0; i < 2048 ;i++) /* default: check all CAN-IDs */
 209                 do_set(i, ENABLE);
 210
 211         while ((opt = getopt(argc, argv, "m:v:r:t:h:l:qbBcf?")) != -1) {
 212                 switch (opt) {
 213                 case 'm':
 214                         sscanf(optarg, "%x", &mask);
 215                         break;
 216
 217                 case 'v':
 218                         sscanf(optarg, "%x", &value);
 219                         break;
 220
 221                 case 'r':
 222                         readsettings(optarg, 0); /* no BCM-setting here */
 223                         break;
 224
 225                 case 't':
 226                         sscanf(optarg, "%ld", &timeout);
 227                         break;
 228
 229                 case 'h':
 230                         sscanf(optarg, "%ld", &hold);
 231                         break;
 232
 233                 case 'l':
 234                         sscanf(optarg, "%ld", &loop);
 235                         break;
 236
 237                 case 'q':
 238                         quiet = 1;
 239                         break;
 240
 241                 case 'b':
 242                         binary = 1;
 243                         binary_gap = 0;
 244                         break;
 245
 246                 case 'B':
 247                         binary = 1;
 248                         binary_gap = 1;
 249                         break;
 250
 251                 case 'c':
 252                         color = 1;
 253                         break;
 254
 255                 case 'f':
 256                         filter_id_only = 1;
 257                         break;
 258
 259                 case '?':
 260                         break;
 261
 262                 default:
 263                         fprintf(stderr, "Unknown option %c\n", opt);
 264                         break;
 265                 }
 266         }
 267
 268         if (optind == argc) {
 269                 print_usage(basename(argv[0]));
 270                 exit(0);
 271         }
 272
 273         if (mask || value) {
 274                 for (i=0; i < 2048 ;i++) {
 275                         if ((i & mask) ==  (value & mask))
 276                                 do_set(i, ENABLE);
 277                         else
 278                                 do_clr(i, ENABLE);
 279                 }
 280         }
 281
 282         if (quiet)
 283                 for (i=0; i < 2048 ;i++)
 284                         do_clr(i, ENABLE);
 285
 286         if (strlen(argv[optind]) >= IFNAMSIZ) {
 287                 printf("name of CAN device '%s' is too long!\n", argv[optind]);
 288                 return 1;
 289         }
 290
 291         interface = argv[optind];
 292
 293         if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_BCM)) < 0) {
 294                 perror("socket");
 295                 return 1;
 296         }
 297
 298         addr.can_family = AF_CAN;
 299
 300         if (strcmp(ANYDEV, argv[optind])) {
 301                 strcpy(ifr.ifr_name, argv[optind]);
 302                 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 303                         perror("SIOCGIFINDEX");
 304                         exit(1);
 305                 }
 306                 addr.can_ifindex = ifr.ifr_ifindex;
 307         }
 308         else
 309                 addr.can_ifindex = 0; /* any can interface */
 310
 311         if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 312                 perror("connect");
 313                 return 1;
 314         }
 315
 316         for (i=0; i < 2048 ;i++) /* initial BCM setup */
 317                 if (is_set(i, ENABLE))
 318                         rx_setup(s, i);
 319
 320         gettimeofday(&start_tv, NULL);
 321         tv.tv_sec = tv.tv_usec = 0;
 322
 323         printf("%s", CSR_HIDE); /* hide cursor */
 324
 325         while (running) {
 326
 327                 FD_ZERO(&rdfs);
 328                 FD_SET(0, &rdfs);
 329                 FD_SET(s, &rdfs);
 330
 331                 timeo.tv_sec  = 0;
 332                 timeo.tv_usec = 100000 * loop;
 333
 334                 if ((ret = select(s+1, &rdfs, NULL, NULL, &timeo)) < 0) {
 335                         //perror("select");
 336                         running = 0;
 337                         continue;
 338                 }
 339
 340                 gettimeofday(&tv, NULL);
 341                 currcms = (tv.tv_sec - start_tv.tv_sec) * 10 + (tv.tv_usec / 100000);
 342
 343                 if (FD_ISSET(0, &rdfs))
 344                         running &= handle_keyb(s);
 345
 346                 if (FD_ISSET(s, &rdfs))
 347                         running &= handle_bcm(s, currcms);
 348
 349                 if (currcms - lastcms >= loop) {
 350                         running &= handle_timeo(s, currcms);
 351                         lastcms = currcms;
 352                 }
 353         }
 354
 355         printf("%s", CSR_SHOW); /* show cursor */
 356
 357         close(s);
 358         return 0;
 359 }
 360
 361 void rx_setup (int fd, int id){
 362
 363         struct {
 364                 struct bcm_msg_head msg_head;
 365                 struct can_frame frame;
 366         } txmsg;
 367
 368         txmsg.msg_head.opcode  = RX_SETUP;
 369         txmsg.msg_head.can_id  = id;
 370         txmsg.msg_head.flags   = RX_CHECK_DLC;
 371         txmsg.msg_head.ival1.tv_sec  = 0;
 372         txmsg.msg_head.ival1.tv_usec = 0;
 373         txmsg.msg_head.ival2.tv_sec  = 0;
 374         txmsg.msg_head.ival2.tv_usec = 0;
 375         txmsg.msg_head.nframes = 1;
 376         U64_DATA(&txmsg.frame) = (__u64) 0xFFFFFFFFFFFFFFFFULL;
 377
 378         if (filter_id_only)
 379                 txmsg.msg_head.flags |= RX_FILTER_ID;
 380
 381         if (write(fd, &txmsg, sizeof(txmsg)) < 0)
 382                 perror("write");
 383 };
 384
 385 void rx_delete (int fd, int id){
 386
 387         struct bcm_msg_head msg_head;
 388
 389         msg_head.opcode  = RX_DELETE;
 390         msg_head.can_id  = id;
 391         msg_head.nframes = 0;
 392
 393         if (write(fd, &msg_head, sizeof(msg_head)) < 0)
 394                 perror("write");
 395 }
 396
 397 int handle_keyb(int fd){
 398
 399         char cmd [20] = {0};
 400         int i;
 401         unsigned int mask;
 402         unsigned int value;
 403
 404         if (read(0, cmd, 19) > strlen("+123456\n"))
 405                 return 1; /* ignore */
 406
 407         if (strlen(cmd) > 0)
 408                 cmd[strlen(cmd)-1] = 0; /* chop off trailing newline */
 409
 410         switch (cmd[0]) {
 411
 412         case '+':
 413         case '-':
 414                 sscanf(&cmd[1], "%x", &value);
 415                 if (strlen(&cmd[1]) > 3) {
 416                         mask = value & 0xFFF;
 417                         value >>= 12;
 418                 }
 419                 else
 420                         mask = 0x7FF;
 421
 422                 if (cmd[0] == '+') {
 423                         for (i=0; i < 2048 ;i++) {
 424                                 if (((i & mask) == (value & mask)) && (is_clr(i, ENABLE))) {
 425                                         do_set(i, ENABLE);
 426                                         rx_setup(fd, i);
 427                                 }
 428                         }
 429                 }
 430                 else { /* '-' */
 431                         for (i=0; i < 2048 ;i++) {
 432                                 if (((i & mask) == (value & mask)) && (is_set(i, ENABLE))) {
 433                                         do_clr(i, ENABLE);
 434                                         rx_delete(fd, i);
 435                                 }
 436                         }
 437                 }
 438                 break;
 439
 440         case 'w' :
 441                 writesettings(&cmd[1]);
 442                 break;
 443
 444         case 'r' :
 445                 readsettings(&cmd[1], fd);
 446                 break;
 447
 448         case 'q' :
 449                 running = 0;
 450                 break;
 451
 452         case 'B' :
 453                 binary_gap = 1;
 454                 if (binary)
 455                         binary = 0;
 456                 else
 457                         binary = 1;
 458
 459                 break;
 460
 461         case 'b' :
 462                 binary_gap = 0;
 463                 if (binary)
 464                         binary = 0;
 465                 else
 466                         binary = 1;
 467
 468                 break;
 469
 470         case 'c' :
 471                 if (color)
 472                         color = 0;
 473                 else
 474                         color = 1;
 475
 476                 break;
 477
 478         case '#' :
 479                 notch = 1;
 480                 break;
 481
 482         case '*' :
 483                 for (i=0; i < 2048; i++)
 484                         U64_DATA(&sniftab[i].notch) = (__u64) 0;
 485                 break;
 486
 487         default:
 488                 break;
 489         }
 490
 491         clearscreen = 1;
 492
 493         return 1; /* ok */
 494 };
 495
 496 int handle_bcm(int fd, long currcms){
 497
 498         int nbytes, id;
 499
 500         struct {
 501                 struct bcm_msg_head msg_head;
 502                 struct can_frame frame;
 503         } bmsg;
 504
 505         if ((nbytes = read(fd, &bmsg, sizeof(bmsg))) < 0) {
 506                 perror("bcm read");
 507                 return 0; /* quit */
 508         }
 509
 510         id = bmsg.msg_head.can_id;
 511         ioctl(fd, SIOCGSTAMP, &sniftab[id].currstamp);
 512
 513         if (bmsg.msg_head.opcode != RX_CHANGED) {
 514                 printf("received strange BCM opcode %d!\n", bmsg.msg_head.opcode);
 515                 return 0; /* quit */
 516         }
 517
 518         if (nbytes != sizeof(bmsg)) {
 519                 printf("received strange BCM data length %d!\n", nbytes);
 520                 return 0; /* quit */
 521         }
 522
 523         sniftab[id].current = bmsg.frame;
 524         U64_DATA(&sniftab[id].marker) |=
 525                 U64_DATA(&sniftab[id].current) ^ U64_DATA(&sniftab[id].last);
 526         sniftab[id].timeout = (timeout)?(currcms + timeout):0;
 527
 528         if (is_clr(id, DISPLAY))
 529                 clearscreen = 1; /* new entry -> new drawing */
 530
 531         do_set(id, DISPLAY);
 532         do_set(id, UPDATE);
 533
 534         return 1; /* ok */
 535 };
 536
 537 int handle_timeo(int fd, long currcms){
 538
 539         int i;
 540         int force_redraw = 0;
 541
 542         if (clearscreen) {
 543                 char startline[80];
 544                 printf("%s%s", CLR_SCREEN, CSR_HOME);
 545                 snprintf(startline, 79, "< cansniffer %s # l=%ld h=%ld t=%ld >", interface, loop, hold, timeout);
 546                 printf("%s%*s",STARTLINESTR, 79-(int)strlen(STARTLINESTR), startline);
 547                 force_redraw = 1;
 548                 clearscreen = 0;
 549         }
 550
 551         if (notch) {
 552                 for (i=0; i < 2048; i++)
 553                         U64_DATA(&sniftab[i].notch) |= U64_DATA(&sniftab[i].marker);
 554                 notch = 0;
 555         }
 556
 557         printf("%s", CSR_HOME);
 558         printf("%c\n", anichar[currcms % MAXANI]); /* funny animation */
 559
 560         for (i=0; i < 2048; i++) {
 561
 562                 if is_set(i, ENABLE) {
 563
 564                                 if is_set(i, DISPLAY) {
 565
 566                                                 if (is_set(i, UPDATE) || (force_redraw)){
 567                                                         print_snifline(i);
 568                                                         sniftab[i].hold = currcms + hold;
 569                                                         do_clr(i, UPDATE);
 570                                                 }
 571                                                 else
 572                                                         if ((sniftab[i].hold) && (sniftab[i].hold < currcms)) {
 573                                                                 U64_DATA(&sniftab[i].marker) = (__u64) 0;
 574                                                                 print_snifline(i);
 575                                                                 sniftab[i].hold = 0; /* disable update by hold */
 576                                                         }
 577                                                         else
 578                                                                 printf("%s", CSR_DOWN); /* skip my line */
 579
 580                                                 if (sniftab[i].timeout && sniftab[i].timeout < currcms) {
 581                                                         do_clr(i, DISPLAY);
 582                                                         do_clr(i, UPDATE);
 583                                                         clearscreen = 1; /* removed entry -> new drawing next time */
 584                                                 }
 585                                         }
 586                                 sniftab[i].last      = sniftab[i].current;
 587                                 sniftab[i].laststamp = sniftab[i].currstamp;
 588                         }
 589         }
 590
 591         return 1; /* ok */
 592
 593 };
 594
 595 void print_snifline(int id){
 596
 597         long diffsec  = sniftab[id].currstamp.tv_sec  - sniftab[id].laststamp.tv_sec;
 598         long diffusec = sniftab[id].currstamp.tv_usec - sniftab[id].laststamp.tv_usec;
 599         int dlc_diff  = sniftab[id].last.can_dlc - sniftab[id].current.can_dlc;
 600         int i,j;
 601
 602         if (diffusec < 0)
 603                 diffsec--, diffusec += 1000000;
 604
 605         if (diffsec < 0)
 606                 diffsec = diffusec = 0;
 607
 608         if (diffsec > 10)
 609                 diffsec = 9, diffusec = 999999;
 610
 611         printf("%ld.%06ld  %3x  ", diffsec, diffusec, id);
 612
 613         if (binary) {
 614
 615                 for (i=0; i<sniftab[id].current.can_dlc; i++) {
 616                         for (j=7; j>=0; j--) {
 617                                 if ((color) && (sniftab[id].marker.data[i] & 1<<j) &&
 618                                     (!(sniftab[id].notch.data[i] & 1<<j)))
 619                                         if (sniftab[id].current.data[i] & 1<<j)
 620                                                 printf("%s1%s", ATTCOLOR, ATTRESET);
 621                                         else
 622                                                 printf("%s0%s", ATTCOLOR, ATTRESET);
 623                                 else
 624                                         if (sniftab[id].current.data[i] & 1<<j)
 625                                                 putchar('1');
 626                                         else
 627                                                 putchar('0');
 628                         }
 629                         if (binary_gap)
 630                                 putchar(' ');
 631                 }
 632
 633                 /*
 634                  * when the can_dlc decreased (dlc_diff > 0),
 635                  * we need to blank the former data printout
 636                  */
 637                 for (i=0; i<dlc_diff; i++) {
 638                         printf("        ");
 639                         if (binary_gap)
 640                                 putchar(' ');
 641                 }
 642         }
 643         else {
 644
 645                 for (i=0; i<sniftab[id].current.can_dlc; i++)
 646                         if ((color) && (sniftab[id].marker.data[i]) && (!(sniftab[id].notch.data[i])))
 647                                 printf("%s%02X%s ", ATTCOLOR, sniftab[id].current.data[i], ATTRESET);
 648                         else
 649                                 printf("%02X ", sniftab[id].current.data[i]);
 650
 651                 if (sniftab[id].current.can_dlc < 8)
 652                         printf("%*s", (8 - sniftab[id].current.can_dlc) * 3, "");
 653
 654                 for (i=0; i<sniftab[id].current.can_dlc; i++)
 655                         if ((sniftab[id].current.data[i] > 0x1F) &&
 656                             (sniftab[id].current.data[i] < 0x7F))
 657                                 if ((color) && (sniftab[id].marker.data[i]) && (!(sniftab[id].notch.data[i])))
 658                                         printf("%s%c%s", ATTCOLOR, sniftab[id].current.data[i], ATTRESET);
 659                                 else
 660                                         putchar(sniftab[id].current.data[i]);
 661                         else
 662                                 putchar('.');
 663
 664                 /*
 665                  * when the can_dlc decreased (dlc_diff > 0),
 666                  * we need to blank the former data printout
 667                  */
 668                 for (i=0; i<dlc_diff; i++)
 669                         putchar(' ');
 670         }
 671
 672         putchar('\n');
 673
 674         U64_DATA(&sniftab[id].marker) = (__u64) 0;
 675
 676 };
 677
 678
 679 void writesettings(char* name){
 680
 681         int fd;
 682         char fname[30] = SETFNAME;
 683         int i,j;
 684         char buf[8]= {0};
 685
 686         strncat(fname, name, 29 - strlen(fname));
 687         fd = open(fname,  O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 688
 689         if (fd > 0) {
 690
 691                 for (i=0; i < 2048 ;i++) {
 692                         sprintf(buf, "<%03X>%c.", i, (is_set(i, ENABLE))?'1':'0');
 693                         write(fd, buf, 7);
 694                         for (j=0; j<8 ; j++){
 695                                 sprintf(buf, "%02X", sniftab[i].notch.data[j]);
 696                                 write(fd, buf, 2);
 697                         }
 698                         write(fd, "\n", 1);
 699                         /* 7 + 16 + 1 = 24 bytes per entry */
 700                 }
 701                 close(fd);
 702         }
 703         else
 704                 printf("unable to write setting file '%s'!\n", fname);
 705 };
 706
 707 void readsettings(char* name, int sockfd){
 708
 709         int fd;
 710         char fname[30] = SETFNAME;
 711         char buf[25] = {0};
 712         int i,j;
 713
 714         strncat(fname, name, 29 - strlen(fname));
 715         fd = open(fname, O_RDONLY);
 716
 717         if (fd > 0) {
 718                 if (!sockfd)
 719                         printf("reading setting file '%s' ... ", fname);
 720
 721                 for (i=0; i < 2048 ;i++) {
 722                         if (read(fd, &buf, 24) == 24) {
 723                                 if (buf[5] & 1) {
 724                                         if (is_clr(i, ENABLE)) {
 725                                                 do_set(i, ENABLE);
 726                                                 if (sockfd)
 727                                                         rx_setup(sockfd, i);
 728                                         }
 729                                 }
 730                                 else
 731                                         if (is_set(i, ENABLE)) {
 732                                                 do_clr(i, ENABLE);
 733                                                 if (sockfd)
 734                                                         rx_delete(sockfd, i);
 735                                         }
 736                                 for (j=7; j>=0 ; j--){
 737                                         sniftab[i].notch.data[j] =
 738                                                 (__u8) strtoul(&buf[2*j+7], (char **)NULL, 16) & 0xFF;
 739                                         buf[2*j+7] = 0; /* cut off each time */
 740                                 }
 741                         }
 742                         else {
 743                                 if (!sockfd)
 744                                         printf("was only able to read until index %d from setting file '%s'!\n",
 745                                                i, fname);
 746                         }
 747                 }
 748
 749                 if (!sockfd)
 750                         printf("done\n");
 751
 752                 close(fd);
 753         }
 754         else
 755                 printf("unable to read setting file '%s'!\n", fname);
 756 };