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 = 0;
 122 static long timeout = TIMEOUT;
 123 static long hold = HOLD;
 124 static long loop = LOOP;
 125 static unsigned char binary = 0;
 126 static unsigned char binary_gap = 0;
 127 static unsigned char color  = 0;
 128
 129 void rx_setup (int fd, int id);
 130 void rx_delete (int fd, int id);
 131 void print_snifline(int id);
 132 int handle_keyb(int fd);
 133 int handle_bcm(int fd, long currcms);
 134 int handle_timeo(int fd, long currcms);
 135 void writesettings(char* name);
 136 void readsettings(char* name, int sockfd);
 137
 138 void print_usage(char *prg)
 139 {
 140         const char manual [] = {
 141                 "commands that can be entered at runtime:\n"
 142                 "\n"
 143                 "q<ENTER>       - quit\n"
 144                 "b<ENTER>       - toggle binary / HEX-ASCII output\n"
 145                 "B<ENTER>       - toggle binary with gap / HEX-ASCII output (exceeds 80 chars!)\n"
 146                 "c<ENTER>       - toggle color mode\n"
 147                 "#<ENTER>       - notch currently marked/changed bits (can be used repeatedly)\n"
 148                 "*<ENTER>       - clear notched marked\n"
 149                 "rMYNAME<ENTER> - read settings file (filter/notch)\n"
 150                 "wMYNAME<ENTER> - write settings file (filter/notch)\n"
 151                 "+FILTER<ENTER> - add CAN-IDs to sniff\n"
 152                 "-FILTER<ENTER> - remove CAN-IDs to sniff\n"
 153                 "\n"
 154                 "FILTER can be a single CAN-ID or a CAN-ID/Bitmask:\n"
 155                 "+1F5<ENTER>    - add CAN-ID 0x1F5\n"
 156                 "-42E<ENTER>    - remove CAN-ID 0x42E\n"
 157                 "-42E7FF<ENTER> - remove CAN-ID 0x42E (using Bitmask)\n"
 158                 "-500700<ENTER> - remove CAN-IDs 0x500 - 0x5FF\n"
 159                 "+400600<ENTER> - add CAN-IDs 0x400 - 0x5FF\n"
 160                 "+000000<ENTER> - add all CAN-IDs\n"
 161                 "-000000<ENTER> - remove all CAN-IDs\n"
 162                 "\n"
 163                 "if (id & filter) == (sniff-id & filter) the action (+/-) is performed,\n"
 164                 "which is quite easy when the filter is 000\n"
 165                 "\n"
 166         };
 167
 168         fprintf(stderr, "\nUsage: %s [can-interface]\n", prg);
 169         fprintf(stderr, "Options: -m <mask>  (initial FILTER default 0x00000000)\n");
 170         fprintf(stderr, "         -v <value> (initial FILTER default 0x00000000)\n");
 171         fprintf(stderr, "         -q         (quiet - all IDs deactivated)\n");
 172         fprintf(stderr, "         -r <name>  (read %sname from file)\n", SETFNAME);
 173         fprintf(stderr, "         -b         (start with binary mode)\n");
 174         fprintf(stderr, "         -B         (start with binary mode with gap - exceeds 80 chars!)\n");
 175         fprintf(stderr, "         -c         (color changes)\n");
 176         fprintf(stderr, "         -t <time>  (timeout for ID display [x100ms] default: %d, 0 = OFF)\n", TIMEOUT);
 177         fprintf(stderr, "         -h <time>  (hold marker on changes [x100ms] default: %d)\n", HOLD);
 178         fprintf(stderr, "         -l <time>  (loop time (display) [x100ms] default: %d)\n", LOOP);
 179         fprintf(stderr, "Use interface name '%s' to receive from all can-interfaces\n", ANYDEV);
 180         fprintf(stderr, "\n");
 181         fprintf(stderr, "%s", manual);
 182 }
 183
 184 void sigterm(int signo)
 185 {
 186         running = 0;
 187 }
 188
 189 int main(int argc, char **argv)
 190 {
 191         fd_set rdfs;
 192         int s;
 193         canid_t mask = 0;
 194         canid_t value = 0;
 195         long currcms = 0;
 196         long lastcms = 0;
 197         unsigned char quiet = 0;
 198
 199         int opt, ret;
 200         struct timeval timeo, start_tv, tv;
 201         struct sockaddr_can addr;
 202         struct ifreq ifr;
 203         int i;
 204
 205
 206         signal(SIGTERM, sigterm);
 207         signal(SIGHUP, sigterm);
 208         signal(SIGINT, sigterm);
 209
 210         for (i=0; i < 2048 ;i++) /* default: check all CAN-IDs */
 211                 do_set(i, ENABLE);
 212
 213         while ((opt = getopt(argc, argv, "m:v:r:t:h:l:qbBc")) != -1) {
 214                 switch (opt) {
 215                 case 'm':
 216                         sscanf(optarg, "%x", &mask);
 217                         break;
 218
 219                 case 'v':
 220                         sscanf(optarg, "%x", &value);
 221                         break;
 222
 223                 case 'r':
 224                         readsettings(optarg, 0); /* no BCM-setting here */
 225                         break;
 226
 227                 case 't':
 228                         sscanf(optarg, "%ld", &timeout);
 229                         break;
 230
 231                 case 'h':
 232                         sscanf(optarg, "%ld", &hold);
 233                         break;
 234
 235                 case 'l':
 236                         sscanf(optarg, "%ld", &loop);
 237                         break;
 238
 239                 case 'q':
 240                         quiet = 1;
 241                         break;
 242
 243                 case 'b':
 244                         binary = 1;
 245                         binary_gap = 0;
 246                         break;
 247
 248                 case 'B':
 249                         binary = 1;
 250                         binary_gap = 1;
 251                         break;
 252
 253                 case 'c':
 254                         color = 1;
 255                         break;
 256
 257                 case '?':
 258                         break;
 259
 260                 default:
 261                         fprintf(stderr, "Unknown option %c\n", opt);
 262                         break;
 263                 }
 264         }
 265
 266         if (optind == argc) {
 267                 print_usage(basename(argv[0]));
 268                 exit(0);
 269         }
 270
 271         if (mask || value) {
 272                 for (i=0; i < 2048 ;i++) {
 273                         if ((i & mask) ==  (value & mask))
 274                                 do_set(i, ENABLE);
 275                         else
 276                                 do_clr(i, ENABLE);
 277                 }
 278         }
 279
 280         if (quiet)
 281                 for (i=0; i < 2048 ;i++)
 282                         do_clr(i, ENABLE);
 283
 284         if (strlen(argv[optind]) >= IFNAMSIZ) {
 285                 printf("name of CAN device '%s' is too long!\n", argv[optind]);
 286                 return 1;
 287         }
 288
 289         if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_BCM)) < 0) {
 290                 perror("socket");
 291                 return 1;
 292         }
 293
 294         addr.can_family = AF_CAN;
 295
 296         if (strcmp(ANYDEV, argv[optind])) {
 297                 strcpy(ifr.ifr_name, argv[optind]);
 298                 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 299                         perror("SIOCGIFINDEX");
 300                         exit(1);
 301                 }
 302                 addr.can_ifindex = ifr.ifr_ifindex;
 303         }
 304         else
 305                 addr.can_ifindex = 0; /* any can interface */
 306
 307         if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 308                 perror("connect");
 309                 return 1;
 310         }
 311
 312         for (i=0; i < 2048 ;i++) /* initial BCM setup */
 313                 if (is_set(i, ENABLE))
 314                         rx_setup(s, i);
 315
 316         gettimeofday(&start_tv, NULL);
 317         tv.tv_sec = tv.tv_usec = 0;
 318
 319         printf("%s", CSR_HIDE); /* hide cursor */
 320
 321         while (running) {
 322
 323                 FD_ZERO(&rdfs);
 324                 FD_SET(0, &rdfs);
 325                 FD_SET(s, &rdfs);
 326
 327                 timeo.tv_sec  = 0;
 328                 timeo.tv_usec = 100000 * loop;
 329
 330                 if ((ret = select(s+1, &rdfs, NULL, NULL, &timeo)) < 0) {
 331                         //perror("select");
 332                         running = 0;
 333                         continue;
 334                 }
 335
 336                 gettimeofday(&tv, NULL);
 337                 currcms = (tv.tv_sec - start_tv.tv_sec) * 10 + (tv.tv_usec / 100000);
 338
 339                 if (FD_ISSET(0, &rdfs))
 340                         running &= handle_keyb(s);
 341
 342                 if (FD_ISSET(s, &rdfs))
 343                         running &= handle_bcm(s, currcms);
 344
 345                 if (currcms - lastcms >= loop) {
 346                         running &= handle_timeo(s, currcms);
 347                         lastcms = currcms;
 348                 }
 349         }
 350
 351         printf("%s", CSR_SHOW); /* show cursor */
 352
 353         close(s);
 354         return 0;
 355 }
 356
 357 void rx_setup (int fd, int id){
 358
 359         struct {
 360                 struct bcm_msg_head msg_head;
 361                 struct can_frame frame;
 362         } txmsg;
 363
 364         txmsg.msg_head.opcode  = RX_SETUP;
 365         txmsg.msg_head.can_id  = id;
 366         txmsg.msg_head.flags   = RX_CHECK_DLC;
 367         txmsg.msg_head.ival1.tv_sec  = 0;
 368         txmsg.msg_head.ival1.tv_usec = 0;
 369         txmsg.msg_head.ival2.tv_sec  = 0;
 370         txmsg.msg_head.ival2.tv_usec = 0;
 371         txmsg.msg_head.nframes = 1;
 372         U64_DATA(&txmsg.frame) = (__u64) 0xFFFFFFFFFFFFFFFFULL;
 373
 374         if (write(fd, &txmsg, sizeof(txmsg)) < 0)
 375                 perror("write");
 376 };
 377
 378 void rx_delete (int fd, int id){
 379
 380         struct bcm_msg_head msg_head;
 381
 382         msg_head.opcode  = RX_DELETE;
 383         msg_head.can_id  = id;
 384         msg_head.nframes = 0;
 385
 386         if (write(fd, &msg_head, sizeof(msg_head)) < 0)
 387                 perror("write");
 388 }
 389
 390 int handle_keyb(int fd){
 391
 392         char cmd [20] = {0};
 393         int i;
 394         unsigned int mask;
 395         unsigned int value;
 396
 397         if (read(0, cmd, 19) > strlen("+123456\n"))
 398                 return 1; /* ignore */
 399
 400         if (strlen(cmd) > 0)
 401                 cmd[strlen(cmd)-1] = 0; /* chop off trailing newline */
 402
 403         switch (cmd[0]) {
 404
 405         case '+':
 406         case '-':
 407                 sscanf(&cmd[1], "%x", &value);
 408                 if (strlen(&cmd[1]) > 3) {
 409                         mask = value & 0xFFF;
 410                         value >>= 12;
 411                 }
 412                 else
 413                         mask = 0x7FF;
 414
 415                 if (cmd[0] == '+') {
 416                         for (i=0; i < 2048 ;i++) {
 417                                 if (((i & mask) == (value & mask)) && (is_clr(i, ENABLE))) {
 418                                         do_set(i, ENABLE);
 419                                         rx_setup(fd, i);
 420                                 }
 421                         }
 422                 }
 423                 else { /* '-' */
 424                         for (i=0; i < 2048 ;i++) {
 425                                 if (((i & mask) == (value & mask)) && (is_set(i, ENABLE))) {
 426                                         do_clr(i, ENABLE);
 427                                         rx_delete(fd, i);
 428                                 }
 429                         }
 430                 }
 431                 break;
 432
 433         case 'w' :
 434                 writesettings(&cmd[1]);
 435                 break;
 436
 437         case 'r' :
 438                 readsettings(&cmd[1], fd);
 439                 break;
 440
 441         case 'q' :
 442                 running = 0;
 443                 break;
 444
 445         case 'B' :
 446                 binary_gap = 1;
 447                 if (binary)
 448                         binary = 0;
 449                 else
 450                         binary = 1;
 451
 452                 break;
 453
 454         case 'b' :
 455                 binary_gap = 0;
 456                 if (binary)
 457                         binary = 0;
 458                 else
 459                         binary = 1;
 460
 461                 break;
 462
 463         case 'c' :
 464                 if (color)
 465                         color = 0;
 466                 else
 467                         color = 1;
 468
 469                 break;
 470
 471         case '#' :
 472                 notch = 1;
 473                 break;
 474
 475         case '*' :
 476                 for (i=0; i < 2048; i++)
 477                         U64_DATA(&sniftab[i].notch) = (__u64) 0;
 478                 break;
 479
 480         default:
 481                 break;
 482         }
 483
 484         clearscreen = 1;
 485
 486         return 1; /* ok */
 487 };
 488
 489 int handle_bcm(int fd, long currcms){
 490
 491         int nbytes, id;
 492
 493         struct {
 494                 struct bcm_msg_head msg_head;
 495                 struct can_frame frame;
 496         } bmsg;
 497
 498         if ((nbytes = read(fd, &bmsg, sizeof(bmsg))) < 0) {
 499                 perror("bcm read");
 500                 return 0; /* quit */
 501         }
 502
 503         id = bmsg.msg_head.can_id;
 504         ioctl(fd, SIOCGSTAMP, &sniftab[id].currstamp);
 505
 506         if (bmsg.msg_head.opcode != RX_CHANGED) {
 507                 printf("received strange BCM opcode %d!\n", bmsg.msg_head.opcode);
 508                 return 0; /* quit */
 509         }
 510
 511         if (nbytes != sizeof(bmsg)) {
 512                 printf("received strange BCM data length %d!\n", nbytes);
 513                 return 0; /* quit */
 514         }
 515
 516         sniftab[id].current = bmsg.frame;
 517         U64_DATA(&sniftab[id].marker) |=
 518                 U64_DATA(&sniftab[id].current) ^ U64_DATA(&sniftab[id].last);
 519         sniftab[id].timeout = (timeout)?(currcms + timeout):0;
 520
 521         if (is_clr(id, DISPLAY))
 522                 clearscreen = 1; /* new entry -> new drawing */
 523
 524         do_set(id, DISPLAY);
 525         do_set(id, UPDATE);
 526
 527         return 1; /* ok */
 528 };
 529
 530 int handle_timeo(int fd, long currcms){
 531
 532         int i;
 533         int force_redraw = 0;
 534
 535         if (clearscreen) {
 536                 char startline[80];
 537                 printf("%s%s", CLR_SCREEN, CSR_HOME);
 538                 snprintf(startline, 79, "< can-sniffer parameters: l=%ld h=%ld t=%ld >", loop, hold, timeout);
 539                 printf("%s%*s",STARTLINESTR, 79-(int)strlen(STARTLINESTR), startline);
 540                 force_redraw = 1;
 541                 clearscreen = 0;
 542         }
 543
 544         if (notch) {
 545                 for (i=0; i < 2048; i++)
 546                         U64_DATA(&sniftab[i].notch) |= U64_DATA(&sniftab[i].marker);
 547                 notch = 0;
 548         }
 549
 550         printf("%s", CSR_HOME);
 551         printf("%c\n", anichar[currcms % MAXANI]); /* funny animation */
 552
 553         for (i=0; i < 2048; i++) {
 554
 555                 if is_set(i, ENABLE) {
 556
 557                                 if is_set(i, DISPLAY) {
 558
 559                                                 if (is_set(i, UPDATE) || (force_redraw)){
 560                                                         print_snifline(i);
 561                                                         sniftab[i].hold = currcms + hold;
 562                                                         do_clr(i, UPDATE);
 563                                                 }
 564                                                 else
 565                                                         if ((sniftab[i].hold) && (sniftab[i].hold < currcms)) {
 566                                                                 U64_DATA(&sniftab[i].marker) = (__u64) 0;
 567                                                                 print_snifline(i);
 568                                                                 sniftab[i].hold = 0; /* disable update by hold */
 569                                                         }
 570                                                         else
 571                                                                 printf("%s", CSR_DOWN); /* skip my line */
 572
 573                                                 if (sniftab[i].timeout && sniftab[i].timeout < currcms) {
 574                                                         do_clr(i, DISPLAY);
 575                                                         do_clr(i, UPDATE);
 576                                                         clearscreen = 1; /* removed entry -> new drawing next time */
 577                                                 }
 578                                         }
 579                                 sniftab[i].last      = sniftab[i].current;
 580                                 sniftab[i].laststamp = sniftab[i].currstamp;
 581                         }
 582         }
 583
 584         return 1; /* ok */
 585
 586 };
 587
 588 void print_snifline(int id){
 589
 590         long diffsec  = sniftab[id].currstamp.tv_sec  - sniftab[id].laststamp.tv_sec;
 591         long diffusec = sniftab[id].currstamp.tv_usec - sniftab[id].laststamp.tv_usec;
 592         int dlc_diff  = sniftab[id].last.can_dlc - sniftab[id].current.can_dlc;
 593         int i,j;
 594
 595         if (diffusec < 0)
 596                 diffsec--, diffusec += 1000000;
 597
 598         if (diffsec < 0)
 599                 diffsec = diffusec = 0;
 600
 601         if (diffsec > 10)
 602                 diffsec = 9, diffusec = 999999;
 603
 604         printf("%ld.%06ld  %3x  ", diffsec, diffusec, id);
 605
 606         if (binary) {
 607
 608                 for (i=0; i<sniftab[id].current.can_dlc; i++) {
 609                         for (j=7; j>=0; j--) {
 610                                 if ((color) && (sniftab[id].marker.data[i] & 1<<j) &&
 611                                     (!(sniftab[id].notch.data[i] & 1<<j)))
 612                                         if (sniftab[id].current.data[i] & 1<<j)
 613                                                 printf("%s1%s", ATTCOLOR, ATTRESET);
 614                                         else
 615                                                 printf("%s0%s", ATTCOLOR, ATTRESET);
 616                                 else
 617                                         if (sniftab[id].current.data[i] & 1<<j)
 618                                                 putchar('1');
 619                                         else
 620                                                 putchar('0');
 621                         }
 622                         if (binary_gap)
 623                                 putchar(' ');
 624                 }
 625
 626                 /*
 627                  * when the can_dlc decreased (dlc_diff > 0),
 628                  * we need to blank the former data printout
 629                  */
 630                 for (i=0; i<dlc_diff; i++) {
 631                         printf("        ");
 632                         if (binary_gap)
 633                                 putchar(' ');
 634                 }
 635         }
 636         else {
 637
 638                 for (i=0; i<sniftab[id].current.can_dlc; i++)
 639                         if ((color) && (sniftab[id].marker.data[i]) && (!(sniftab[id].notch.data[i])))
 640                                 printf("%s%02X%s ", ATTCOLOR, sniftab[id].current.data[i], ATTRESET);
 641                         else
 642                                 printf("%02X ", sniftab[id].current.data[i]);
 643
 644                 if (sniftab[id].current.can_dlc < 8)
 645                         printf("%*s", (8 - sniftab[id].current.can_dlc) * 3, "");
 646
 647                 for (i=0; i<sniftab[id].current.can_dlc; i++)
 648                         if ((sniftab[id].current.data[i] > 0x1F) &&
 649                             (sniftab[id].current.data[i] < 0x7F))
 650                                 if ((color) && (sniftab[id].marker.data[i]) && (!(sniftab[id].notch.data[i])))
 651                                         printf("%s%c%s", ATTCOLOR, sniftab[id].current.data[i], ATTRESET);
 652                                 else
 653                                         putchar(sniftab[id].current.data[i]);
 654                         else
 655                                 putchar('.');
 656
 657                 /*
 658                  * when the can_dlc decreased (dlc_diff > 0),
 659                  * we need to blank the former data printout
 660                  */
 661                 for (i=0; i<dlc_diff; i++)
 662                         putchar(' ');
 663         }
 664
 665         putchar('\n');
 666
 667         U64_DATA(&sniftab[id].marker) = (__u64) 0;
 668
 669 };
 670
 671
 672 void writesettings(char* name){
 673
 674         int fd;
 675         char fname[30] = SETFNAME;
 676         int i,j;
 677         char buf[8]= {0};
 678
 679         strncat(fname, name, 29 - strlen(fname));
 680         fd = open(fname,  O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 681
 682         if (fd > 0) {
 683
 684                 for (i=0; i < 2048 ;i++) {
 685                         sprintf(buf, "<%03X>%c.", i, (is_set(i, ENABLE))?'1':'0');
 686                         write(fd, buf, 7);
 687                         for (j=0; j<8 ; j++){
 688                                 sprintf(buf, "%02X", sniftab[i].notch.data[j]);
 689                                 write(fd, buf, 2);
 690                         }
 691                         write(fd, "\n", 1);
 692                         /* 7 + 16 + 1 = 24 bytes per entry */
 693                 }
 694                 close(fd);
 695         }
 696         else
 697                 printf("unable to write setting file '%s'!\n", fname);
 698 };
 699
 700 void readsettings(char* name, int sockfd){
 701
 702         int fd;
 703         char fname[30] = SETFNAME;
 704         char buf[25] = {0};
 705         int i,j;
 706
 707         strncat(fname, name, 29 - strlen(fname));
 708         fd = open(fname, O_RDONLY);
 709
 710         if (fd > 0) {
 711                 if (!sockfd)
 712                         printf("reading setting file '%s' ... ", fname);
 713
 714                 for (i=0; i < 2048 ;i++) {
 715                         if (read(fd, &buf, 24) == 24) {
 716                                 if (buf[5] & 1) {
 717                                         if (is_clr(i, ENABLE)) {
 718                                                 do_set(i, ENABLE);
 719                                                 if (sockfd)
 720                                                         rx_setup(sockfd, i);
 721                                         }
 722                                 }
 723                                 else
 724                                         if (is_set(i, ENABLE)) {
 725                                                 do_clr(i, ENABLE);
 726                                                 if (sockfd)
 727                                                         rx_delete(sockfd, i);
 728                                         }
 729                                 for (j=7; j>=0 ; j--){
 730                                         sniftab[i].notch.data[j] =
 731                                                 (__u8) strtoul(&buf[2*j+7], (char **)NULL, 16) & 0xFF;
 732                                         buf[2*j+7] = 0; /* cut off each time */
 733                                 }
 734                         }
 735                         else {
 736                                 if (!sockfd)
 737                                         printf("was only able to read until index %d from setting file '%s'!\n",
 738                                                i, fname);
 739                         }
 740                 }
 741
 742                 if (!sockfd)
 743                         printf("done\n");
 744
 745                 close(fd);
 746         }
 747         else
 748                 printf("unable to read setting file '%s'!\n", fname);
 749 };