cansniffer.c

   1 /*
   2  *  $Id$
   3  */
   4
   5 /*
   6  * can-sniffer.c
   7  *
   8  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of Volkswagen nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * Alternatively, provided that this notice is retained in full, this
  24  * software may be distributed under the terms of the GNU General
  25  * Public License ("GPL") version 2, in which case the provisions of the
  26  * GPL apply INSTEAD OF those given above.
  27  *
  28  * The provided data structures and external interfaces from this code
  29  * are not restricted to be used by modules with a GPL compatible license.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  36  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  37  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  38  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  39  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  40  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  41  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  42  * DAMAGE.
  43  *
  44  * Send feedback to <socketcan-users@lists.berlios.de>
  45  *
  46  */
  47
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <unistd.h>
  51 #include <string.h>
  52 #include <fcntl.h>
  53 #include <signal.h>
  54 #include <ctype.h>
  55 #include <libgen.h>
  56 #include <time.h>
  57
  58 #include <sys/time.h>
  59 #include <sys/types.h>
  60 #include <sys/stat.h>
  61 #include <sys/socket.h>
  62 #include <sys/ioctl.h>
  63 #include <sys/uio.h>
  64 #include <net/if.h>
  65
  66 #include <linux/can.h>
  67 #include <linux/can/bcm.h>
  68
  69 #include "terminal.h"
  70
  71 #define U64_DATA(p) (*(unsigned long long*)(p)->data)
  72
  73 #define SETFNAME "sniffset."
  74 #define ANYDEV   "any"
  75
  76 /* flags */
  77
  78 #define ENABLE  1 /* by filter or user */
  79 #define DISPLAY 2 /* is on the screen */
  80 #define UPDATE  4 /* needs to be printed on the screen */
  81 #define CLRSCR  8 /* clear screen in next loop */
  82
  83 /* flags testing & setting */
  84
  85 #define is_set(id, flag) (sniftab[id].flags & flag)
  86 #define is_clr(id, flag) (!(sniftab[id].flags & flag))
  87
  88 #define do_set(id, flag) (sniftab[id].flags |= flag)
  89 #define do_clr(id, flag) (sniftab[id].flags &= ~flag)
  90
  91 /* time defaults */
  92
  93 #define TIMEOUT 50 /* in 100ms */
  94 #define HOLD    10 /* in 100ms */
  95 #define LOOP     2 /* in 100ms */
  96
  97 #define MAXANI 8
  98 const char anichar[MAXANI] = {'|', '/', '-', '\\', '|', '/', '-', '\\'};
  99
 100 #define ATTCOLOR ATTBOLD FGRED
 101
 102 #define STARTLINESTR "X  time    ID  data ... "
 103
 104 struct snif {
 105         int flags;
 106         long hold;
 107         long timeout;
 108         struct timeval laststamp;
 109         struct timeval currstamp;
 110         struct can_frame last;
 111         struct can_frame current;
 112         struct can_frame marker;
 113         struct can_frame notch;
 114 } sniftab[2048];
 115
 116
 117 extern int optind, opterr, optopt;
 118
 119 static int running = 1;
 120 static int clearscreen = 1;
 121 static int notch;
 122 static int filter_id_only;
 123 static long timeout = TIMEOUT;
 124 static long hold = HOLD;
 125 static long loop = LOOP;
 126 static unsigned char binary;
 127 static unsigned char binary_gap;
 128 static unsigned char color;
 129
 130 void rx_setup (int fd, int id);
 131 void rx_delete (int fd, int id);
 132 void print_snifline(int id);
 133 int handle_keyb(int fd);
 134 int handle_bcm(int fd, long currcms);
 135 int handle_timeo(int fd, long currcms);
 136 void writesettings(char* name);
 137 void readsettings(char* name, int sockfd);
 138
 139 void print_usage(char *prg)
 140 {
 141         const char manual [] = {
 142                 "commands that can be entered at runtime:\n"
 143                 "\n"
 144                 "q<ENTER>       - quit\n"
 145                 "b<ENTER>       - toggle binary / HEX-ASCII output\n"
 146                 "B<ENTER>       - toggle binary with gap / HEX-ASCII output (exceeds 80 chars!)\n"
 147                 "c<ENTER>       - toggle color mode\n"
 148                 "#<ENTER>       - notch currently marked/changed bits (can be used repeatedly)\n"
 149                 "*<ENTER>       - clear notched marked\n"
 150                 "rMYNAME<ENTER> - read settings file (filter/notch)\n"
 151                 "wMYNAME<ENTER> - write settings file (filter/notch)\n"
 152                 "+FILTER<ENTER> - add CAN-IDs to sniff\n"
 153                 "-FILTER<ENTER> - remove CAN-IDs to sniff\n"
 154                 "\n"
 155                 "FILTER can be a single CAN-ID or a CAN-ID/Bitmask:\n"
 156                 "+1F5<ENTER>    - add CAN-ID 0x1F5\n"
 157                 "-42E<ENTER>    - remove CAN-ID 0x42E\n"
 158                 "-42E7FF<ENTER> - remove CAN-ID 0x42E (using Bitmask)\n"
 159                 "-500700<ENTER> - remove CAN-IDs 0x500 - 0x5FF\n"
 160                 "+400600<ENTER> - add CAN-IDs 0x400 - 0x5FF\n"
 161                 "+000000<ENTER> - add all CAN-IDs\n"
 162                 "-000000<ENTER> - remove all CAN-IDs\n"
 163                 "\n"
 164                 "if (id & filter) == (sniff-id & filter) the action (+/-) is performed,\n"
 165                 "which is quite easy when the filter is 000\n"
 166                 "\n"
 167         };
 168
 169         fprintf(stderr, "\nUsage: %s [can-interface]\n", prg);
 170         fprintf(stderr, "Options: -m <mask>  (initial FILTER default 0x00000000)\n");
 171         fprintf(stderr, "         -v <value> (initial FILTER default 0x00000000)\n");
 172         fprintf(stderr, "         -q         (quiet - all IDs deactivated)\n");
 173         fprintf(stderr, "         -r <name>  (read %sname from file)\n", SETFNAME);
 174         fprintf(stderr, "         -b         (start with binary mode)\n");
 175         fprintf(stderr, "         -B         (start with binary mode with gap - exceeds 80 chars!)\n");
 176         fprintf(stderr, "         -c         (color changes)\n");
 177         fprintf(stderr, "         -f         (filter on CAN-ID only)\n");
 178         fprintf(stderr, "         -t <time>  (timeout for ID display [x100ms] default: %d, 0 = OFF)\n", TIMEOUT);
 179         fprintf(stderr, "         -h <time>  (hold marker on changes [x100ms] default: %d)\n", HOLD);
 180         fprintf(stderr, "         -l <time>  (loop time (display) [x100ms] default: %d)\n", LOOP);
 181         fprintf(stderr, "Use interface name '%s' to receive from all can-interfaces\n", ANYDEV);
 182         fprintf(stderr, "\n");
 183         fprintf(stderr, "%s", manual);
 184 }
 185
 186 void sigterm(int signo)
 187 {
 188         running = 0;
 189 }
 190
 191 int main(int argc, char **argv)
 192 {
 193         fd_set rdfs;
 194         int s;
 195         canid_t mask = 0;
 196         canid_t value = 0;
 197         long currcms = 0;
 198         long lastcms = 0;
 199         unsigned char quiet = 0;
 200         int opt, ret;
 201         struct timeval timeo, start_tv, tv;
 202         struct sockaddr_can addr;
 203         struct ifreq ifr;
 204         int i;
 205
 206
 207         signal(SIGTERM, sigterm);
 208         signal(SIGHUP, sigterm);
 209         signal(SIGINT, sigterm);
 210
 211         for (i=0; i < 2048 ;i++) /* default: check all CAN-IDs */
 212                 do_set(i, ENABLE);
 213
 214         while ((opt = getopt(argc, argv, "m:v:r:t:h:l:qbBcf")) != -1) {
 215                 switch (opt) {
 216                 case 'm':
 217                         sscanf(optarg, "%x", &mask);
 218                         break;
 219
 220                 case 'v':
 221                         sscanf(optarg, "%x", &value);
 222                         break;
 223
 224                 case 'r':
 225                         readsettings(optarg, 0); /* no BCM-setting here */
 226                         break;
 227
 228                 case 't':
 229                         sscanf(optarg, "%ld", &timeout);
 230                         break;
 231
 232                 case 'h':
 233                         sscanf(optarg, "%ld", &hold);
 234                         break;
 235
 236                 case 'l':
 237                         sscanf(optarg, "%ld", &loop);
 238                         break;
 239
 240                 case 'q':
 241                         quiet = 1;
 242                         break;
 243
 244                 case 'b':
 245                         binary = 1;
 246                         binary_gap = 0;
 247                         break;
 248
 249                 case 'B':
 250                         binary = 1;
 251                         binary_gap = 1;
 252                         break;
 253
 254                 case 'c':
 255                         color = 1;
 256                         break;
 257
 258                 case 'f':
 259                         filter_id_only = 1;
 260                         break;
 261
 262                 case '?':
 263                         break;
 264
 265                 default:
 266                         fprintf(stderr, "Unknown option %c\n", opt);
 267                         break;
 268                 }
 269         }
 270
 271         if (optind == argc) {
 272                 print_usage(basename(argv[0]));
 273                 exit(0);
 274         }
 275
 276         if (mask || value) {
 277                 for (i=0; i < 2048 ;i++) {
 278                         if ((i & mask) ==  (value & mask))
 279                                 do_set(i, ENABLE);
 280                         else
 281                                 do_clr(i, ENABLE);
 282                 }
 283         }
 284
 285         if (quiet)
 286                 for (i=0; i < 2048 ;i++)
 287                         do_clr(i, ENABLE);
 288
 289         if (strlen(argv[optind]) >= IFNAMSIZ) {
 290                 printf("name of CAN device '%s' is too long!\n", argv[optind]);
 291                 return 1;
 292         }
 293
 294         if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_BCM)) < 0) {
 295                 perror("socket");
 296                 return 1;
 297         }
 298
 299         addr.can_family = AF_CAN;
 300
 301         if (strcmp(ANYDEV, argv[optind])) {
 302                 strcpy(ifr.ifr_name, argv[optind]);
 303                 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 304                         perror("SIOCGIFINDEX");
 305                         exit(1);
 306                 }
 307                 addr.can_ifindex = ifr.ifr_ifindex;
 308         }
 309         else
 310                 addr.can_ifindex = 0; /* any can interface */
 311
 312         if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 313                 perror("connect");
 314                 return 1;
 315         }
 316
 317         for (i=0; i < 2048 ;i++) /* initial BCM setup */
 318                 if (is_set(i, ENABLE))
 319                         rx_setup(s, i);
 320
 321         gettimeofday(&start_tv, NULL);
 322         tv.tv_sec = tv.tv_usec = 0;
 323
 324         printf("%s", CSR_HIDE); /* hide cursor */
 325
 326         while (running) {
 327
 328                 FD_ZERO(&rdfs);
 329                 FD_SET(0, &rdfs);
 330                 FD_SET(s, &rdfs);
 331
 332                 timeo.tv_sec  = 0;
 333                 timeo.tv_usec = 100000 * loop;
 334
 335                 if ((ret = select(s+1, &rdfs, NULL, NULL, &timeo)) < 0) {
 336                         //perror("select");
 337                         running = 0;
 338                         continue;
 339                 }
 340
 341                 gettimeofday(&tv, NULL);
 342                 currcms = (tv.tv_sec - start_tv.tv_sec) * 10 + (tv.tv_usec / 100000);
 343
 344                 if (FD_ISSET(0, &rdfs))
 345                         running &= handle_keyb(s);
 346
 347                 if (FD_ISSET(s, &rdfs))
 348                         running &= handle_bcm(s, currcms);
 349
 350                 if (currcms - lastcms >= loop) {
 351                         running &= handle_timeo(s, currcms);
 352                         lastcms = currcms;
 353                 }
 354         }
 355
 356         printf("%s", CSR_SHOW); /* show cursor */
 357
 358         close(s);
 359         return 0;
 360 }
 361
 362 void rx_setup (int fd, int id){
 363
 364         struct {
 365                 struct bcm_msg_head msg_head;
 366                 struct can_frame frame;
 367         } txmsg;
 368
 369         txmsg.msg_head.opcode  = RX_SETUP;
 370         txmsg.msg_head.can_id  = id;
 371         txmsg.msg_head.flags   = RX_CHECK_DLC;
 372         txmsg.msg_head.ival1.tv_sec  = 0;
 373         txmsg.msg_head.ival1.tv_usec = 0;
 374         txmsg.msg_head.ival2.tv_sec  = 0;
 375         txmsg.msg_head.ival2.tv_usec = 0;
 376         txmsg.msg_head.nframes = 1;
 377         U64_DATA(&txmsg.frame) = (__u64) 0xFFFFFFFFFFFFFFFFULL;
 378
 379         if (filter_id_only)
 380                 txmsg.msg_head.flags |= RX_FILTER_ID;
 381
 382         if (write(fd, &txmsg, sizeof(txmsg)) < 0)
 383                 perror("write");
 384 };
 385
 386 void rx_delete (int fd, int id){
 387
 388         struct bcm_msg_head msg_head;
 389
 390         msg_head.opcode  = RX_DELETE;
 391         msg_head.can_id  = id;
 392         msg_head.nframes = 0;
 393
 394         if (write(fd, &msg_head, sizeof(msg_head)) < 0)
 395                 perror("write");
 396 }
 397
 398 int handle_keyb(int fd){
 399
 400         char cmd [20] = {0};
 401         int i;
 402         unsigned int mask;
 403         unsigned int value;
 404
 405         if (read(0, cmd, 19) > strlen("+123456\n"))
 406                 return 1; /* ignore */
 407
 408         if (strlen(cmd) > 0)
 409                 cmd[strlen(cmd)-1] = 0; /* chop off trailing newline */
 410
 411         switch (cmd[0]) {
 412
 413         case '+':
 414         case '-':
 415                 sscanf(&cmd[1], "%x", &value);
 416                 if (strlen(&cmd[1]) > 3) {
 417                         mask = value & 0xFFF;
 418                         value >>= 12;
 419                 }
 420                 else
 421                         mask = 0x7FF;
 422
 423                 if (cmd[0] == '+') {
 424                         for (i=0; i < 2048 ;i++) {
 425                                 if (((i & mask) == (value & mask)) && (is_clr(i, ENABLE))) {
 426                                         do_set(i, ENABLE);
 427                                         rx_setup(fd, i);
 428                                 }
 429                         }
 430                 }
 431                 else { /* '-' */
 432                         for (i=0; i < 2048 ;i++) {
 433                                 if (((i & mask) == (value & mask)) && (is_set(i, ENABLE))) {
 434                                         do_clr(i, ENABLE);
 435                                         rx_delete(fd, i);
 436                                 }
 437                         }
 438                 }
 439                 break;
 440
 441         case 'w' :
 442                 writesettings(&cmd[1]);
 443                 break;
 444
 445         case 'r' :
 446                 readsettings(&cmd[1], fd);
 447                 break;
 448
 449         case 'q' :
 450                 running = 0;
 451                 break;
 452
 453         case 'B' :
 454                 binary_gap = 1;
 455                 if (binary)
 456                         binary = 0;
 457                 else
 458                         binary = 1;
 459
 460                 break;
 461
 462         case 'b' :
 463                 binary_gap = 0;
 464                 if (binary)
 465                         binary = 0;
 466                 else
 467                         binary = 1;
 468
 469                 break;
 470
 471         case 'c' :
 472                 if (color)
 473                         color = 0;
 474                 else
 475                         color = 1;
 476
 477                 break;
 478
 479         case '#' :
 480                 notch = 1;
 481                 break;
 482
 483         case '*' :
 484                 for (i=0; i < 2048; i++)
 485                         U64_DATA(&sniftab[i].notch) = (__u64) 0;
 486                 break;
 487
 488         default:
 489                 break;
 490         }
 491
 492         clearscreen = 1;
 493
 494         return 1; /* ok */
 495 };
 496
 497 int handle_bcm(int fd, long currcms){
 498
 499         int nbytes, id;
 500
 501         struct {
 502                 struct bcm_msg_head msg_head;
 503                 struct can_frame frame;
 504         } bmsg;
 505
 506         if ((nbytes = read(fd, &bmsg, sizeof(bmsg))) < 0) {
 507                 perror("bcm read");
 508                 return 0; /* quit */
 509         }
 510
 511         id = bmsg.msg_head.can_id;
 512         ioctl(fd, SIOCGSTAMP, &sniftab[id].currstamp);
 513
 514         if (bmsg.msg_head.opcode != RX_CHANGED) {
 515                 printf("received strange BCM opcode %d!\n", bmsg.msg_head.opcode);
 516                 return 0; /* quit */
 517         }
 518
 519         if (nbytes != sizeof(bmsg)) {
 520                 printf("received strange BCM data length %d!\n", nbytes);
 521                 return 0; /* quit */
 522         }
 523
 524         sniftab[id].current = bmsg.frame;
 525         U64_DATA(&sniftab[id].marker) |=
 526                 U64_DATA(&sniftab[id].current) ^ U64_DATA(&sniftab[id].last);
 527         sniftab[id].timeout = (timeout)?(currcms + timeout):0;
 528
 529         if (is_clr(id, DISPLAY))
 530                 clearscreen = 1; /* new entry -> new drawing */
 531
 532         do_set(id, DISPLAY);
 533         do_set(id, UPDATE);
 534
 535         return 1; /* ok */
 536 };
 537
 538 int handle_timeo(int fd, long currcms){
 539
 540         int i;
 541         int force_redraw = 0;
 542
 543         if (clearscreen) {
 544                 char startline[80];
 545                 printf("%s%s", CLR_SCREEN, CSR_HOME);
 546                 snprintf(startline, 79, "< can-sniffer parameters: l=%ld h=%ld t=%ld >", loop, hold, timeout);
 547                 printf("%s%*s",STARTLINESTR, 79-(int)strlen(STARTLINESTR), startline);
 548                 force_redraw = 1;
 549                 clearscreen = 0;
 550         }
 551
 552         if (notch) {
 553                 for (i=0; i < 2048; i++)
 554                         U64_DATA(&sniftab[i].notch) |= U64_DATA(&sniftab[i].marker);
 555                 notch = 0;
 556         }
 557
 558         printf("%s", CSR_HOME);
 559         printf("%c\n", anichar[currcms % MAXANI]); /* funny animation */
 560
 561         for (i=0; i < 2048; i++) {
 562
 563                 if is_set(i, ENABLE) {
 564
 565                                 if is_set(i, DISPLAY) {
 566
 567                                                 if (is_set(i, UPDATE) || (force_redraw)){
 568                                                         print_snifline(i);
 569                                                         sniftab[i].hold = currcms + hold;
 570                                                         do_clr(i, UPDATE);
 571                                                 }
 572                                                 else
 573                                                         if ((sniftab[i].hold) && (sniftab[i].hold < currcms)) {
 574                                                                 U64_DATA(&sniftab[i].marker) = (__u64) 0;
 575                                                                 print_snifline(i);
 576                                                                 sniftab[i].hold = 0; /* disable update by hold */
 577                                                         }
 578                                                         else
 579                                                                 printf("%s", CSR_DOWN); /* skip my line */
 580
 581                                                 if (sniftab[i].timeout && sniftab[i].timeout < currcms) {
 582                                                         do_clr(i, DISPLAY);
 583                                                         do_clr(i, UPDATE);
 584                                                         clearscreen = 1; /* removed entry -> new drawing next time */
 585                                                 }
 586                                         }
 587                                 sniftab[i].last      = sniftab[i].current;
 588                                 sniftab[i].laststamp = sniftab[i].currstamp;
 589                         }
 590         }
 591
 592         return 1; /* ok */
 593
 594 };
 595
 596 void print_snifline(int id){
 597
 598         long diffsec  = sniftab[id].currstamp.tv_sec  - sniftab[id].laststamp.tv_sec;
 599         long diffusec = sniftab[id].currstamp.tv_usec - sniftab[id].laststamp.tv_usec;
 600         int dlc_diff  = sniftab[id].last.can_dlc - sniftab[id].current.can_dlc;
 601         int i,j;
 602
 603         if (diffusec < 0)
 604                 diffsec--, diffusec += 1000000;
 605
 606         if (diffsec < 0)
 607                 diffsec = diffusec = 0;
 608
 609         if (diffsec > 10)
 610                 diffsec = 9, diffusec = 999999;
 611
 612         printf("%ld.%06ld  %3x  ", diffsec, diffusec, id);
 613
 614         if (binary) {
 615
 616                 for (i=0; i<sniftab[id].current.can_dlc; i++) {
 617                         for (j=7; j>=0; j--) {
 618                                 if ((color) && (sniftab[id].marker.data[i] & 1<<j) &&
 619                                     (!(sniftab[id].notch.data[i] & 1<<j)))
 620                                         if (sniftab[id].current.data[i] & 1<<j)
 621                                                 printf("%s1%s", ATTCOLOR, ATTRESET);
 622                                         else
 623                                                 printf("%s0%s", ATTCOLOR, ATTRESET);
 624                                 else
 625                                         if (sniftab[id].current.data[i] & 1<<j)
 626                                                 putchar('1');
 627                                         else
 628                                                 putchar('0');
 629                         }
 630                         if (binary_gap)
 631                                 putchar(' ');
 632                 }
 633
 634                 /*
 635                  * when the can_dlc decreased (dlc_diff > 0),
 636                  * we need to blank the former data printout
 637                  */
 638                 for (i=0; i<dlc_diff; i++) {
 639                         printf("        ");
 640                         if (binary_gap)
 641                                 putchar(' ');
 642                 }
 643         }
 644         else {
 645
 646                 for (i=0; i<sniftab[id].current.can_dlc; i++)
 647                         if ((color) && (sniftab[id].marker.data[i]) && (!(sniftab[id].notch.data[i])))
 648                                 printf("%s%02X%s ", ATTCOLOR, sniftab[id].current.data[i], ATTRESET);
 649                         else
 650                                 printf("%02X ", sniftab[id].current.data[i]);
 651
 652                 if (sniftab[id].current.can_dlc < 8)
 653                         printf("%*s", (8 - sniftab[id].current.can_dlc) * 3, "");
 654
 655                 for (i=0; i<sniftab[id].current.can_dlc; i++)
 656                         if ((sniftab[id].current.data[i] > 0x1F) &&
 657                             (sniftab[id].current.data[i] < 0x7F))
 658                                 if ((color) && (sniftab[id].marker.data[i]) && (!(sniftab[id].notch.data[i])))
 659                                         printf("%s%c%s", ATTCOLOR, sniftab[id].current.data[i], ATTRESET);
 660                                 else
 661                                         putchar(sniftab[id].current.data[i]);
 662                         else
 663                                 putchar('.');
 664
 665                 /*
 666                  * when the can_dlc decreased (dlc_diff > 0),
 667                  * we need to blank the former data printout
 668                  */
 669                 for (i=0; i<dlc_diff; i++)
 670                         putchar(' ');
 671         }
 672
 673         putchar('\n');
 674
 675         U64_DATA(&sniftab[id].marker) = (__u64) 0;
 676
 677 };
 678
 679
 680 void writesettings(char* name){
 681
 682         int fd;
 683         char fname[30] = SETFNAME;
 684         int i,j;
 685         char buf[8]= {0};
 686
 687         strncat(fname, name, 29 - strlen(fname));
 688         fd = open(fname,  O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 689
 690         if (fd > 0) {
 691
 692                 for (i=0; i < 2048 ;i++) {
 693                         sprintf(buf, "<%03X>%c.", i, (is_set(i, ENABLE))?'1':'0');
 694                         write(fd, buf, 7);
 695                         for (j=0; j<8 ; j++){
 696                                 sprintf(buf, "%02X", sniftab[i].notch.data[j]);
 697                                 write(fd, buf, 2);
 698                         }
 699                         write(fd, "\n", 1);
 700                         /* 7 + 16 + 1 = 24 bytes per entry */
 701                 }
 702                 close(fd);
 703         }
 704         else
 705                 printf("unable to write setting file '%s'!\n", fname);
 706 };
 707
 708 void readsettings(char* name, int sockfd){
 709
 710         int fd;
 711         char fname[30] = SETFNAME;
 712         char buf[25] = {0};
 713         int i,j;
 714
 715         strncat(fname, name, 29 - strlen(fname));
 716         fd = open(fname, O_RDONLY);
 717
 718         if (fd > 0) {
 719                 if (!sockfd)
 720                         printf("reading setting file '%s' ... ", fname);
 721
 722                 for (i=0; i < 2048 ;i++) {
 723                         if (read(fd, &buf, 24) == 24) {
 724                                 if (buf[5] & 1) {
 725                                         if (is_clr(i, ENABLE)) {
 726                                                 do_set(i, ENABLE);
 727                                                 if (sockfd)
 728                                                         rx_setup(sockfd, i);
 729                                         }
 730                                 }
 731                                 else
 732                                         if (is_set(i, ENABLE)) {
 733                                                 do_clr(i, ENABLE);
 734                                                 if (sockfd)
 735                                                         rx_delete(sockfd, i);
 736                                         }
 737                                 for (j=7; j>=0 ; j--){
 738                                         sniftab[i].notch.data[j] =
 739                                                 (__u8) strtoul(&buf[2*j+7], (char **)NULL, 16) & 0xFF;
 740                                         buf[2*j+7] = 0; /* cut off each time */
 741                                 }
 742                         }
 743                         else {
 744                                 if (!sockfd)
 745                                         printf("was only able to read until index %d from setting file '%s'!\n",
 746                                                i, fname);
 747                         }
 748                 }
 749
 750                 if (!sockfd)
 751                         printf("done\n");
 752
 753                 close(fd);
 754         }
 755         else
 756                 printf("unable to read setting file '%s'!\n", fname);
 757 };