dist/ipf/l4check/l4check.c

   1 /*      $NetBSD: l4check.c,v 1.2 2004/11/13 19:16:10 he Exp $   */
   2
   3 /*
   4  * (C)Copyright March, 2000 - Darren Reed.
   5  */
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <sys/mman.h>
   9 #include <sys/socket.h>
  10 #include <sys/time.h>
  11 #include <sys/ioctl.h>
  12
  13 #include <netinet/in.h>
  14 #include <netinet/in_systm.h>
  15 #include <netinet/ip.h>
  16
  17 #include <net/if.h>
  18
  19 #include <stdio.h>
  20 #include <netdb.h>
  21 #include <string.h>
  22 #include <ctype.h>
  23 #include <fcntl.h>
  24 #include <errno.h>
  25 #include <stdlib.h>
  26
  27 #include "ip_compat.h"
  28 #include "ip_fil.h"
  29 #include "ip_nat.h"
  30 #include "ipl.h"
  31
  32 #include "ipf.h"
  33
  34 extern  char    *optarg;
  35
  36
  37 typedef struct  l4cfg   {
  38         struct  l4cfg           *l4_next;
  39         struct  ipnat           l4_nat;         /* NAT rule */
  40         struct  sockaddr_in     l4_sin;         /* remote socket to connect */
  41         time_t                  l4_last;        /* when we last connected */
  42         int                     l4_alive;       /* 1 = remote alive */
  43         int                     l4_fd;
  44         int                     l4_rw;          /* 0 = reading, 1 = writing */
  45         char                    *l4_rbuf;       /* read buffer */
  46         int                     l4_rsize;       /* size of buffer */
  47         int                     l4_rlen;        /* how much used */
  48         char                    *l4_wptr;       /* next byte to write */
  49         int                     l4_wlen;        /* length yet to be written */
  50 } l4cfg_t;
  51
  52
  53 l4cfg_t *l4list = NULL;
  54 char *response = NULL;
  55 char *probe = NULL;
  56 l4cfg_t template;
  57 int frequency = 20;
  58 int ctimeout = 1;
  59 int rtimeout = 1;
  60 size_t plen = 0;
  61 size_t rlen = 0;
  62 int natfd = -1;
  63 int opts = 0;
  64
  65 #if defined(sun) && !defined(__svr4__) && !defined(__SVR4)
  66 # define        strerror(x)     sys_errlist[x]
  67 #endif
  68
  69
  70 char *copystr(dst, src)
  71 char *dst, *src;
  72 {
  73         register char *s, *t, c;
  74         register int esc = 0;
  75
  76         for (s = src, t = dst; s && t && (c = *s++); )
  77                 if (esc) {
  78                         esc = 0;
  79                         switch (c)
  80                         {
  81                         case 'n' :
  82                                 *t++ = '\n';
  83                                 break;
  84                         case 'r' :
  85                                 *t++ = '\r';
  86                                 break;
  87                         case 't' :
  88                                 *t++ = '\t';
  89                                 break;
  90                         }
  91                 } else if (c != '\\')
  92                         *t++ = c;
  93                 else
  94                         esc = 1;
  95         *t = '\0';
  96         return dst;
  97 }
  98
  99 void addnat(l4)
 100 l4cfg_t *l4;
 101 {
 102
 103         ipnat_t *ipn = &l4->l4_nat;
 104
 105         printf("Add NAT rule for %s/%#x,%u -> ", inet_ntoa(ipn->in_out[0].in4),
 106                 ipn->in_outmsk, ntohs(ipn->in_pmin));
 107         printf("%s,%u\n", inet_ntoa(ipn->in_in[0].in4), ntohs(ipn->in_pnext));
 108         if (!(opts & OPT_DONOTHING)) {
 109                 ipfobj_t obj;
 110
 111                 bzero(&obj, sizeof(obj));
 112                 obj.ipfo_rev = IPFILTER_VERSION;
 113                 obj.ipfo_size = sizeof(*ipn);
 114                 obj.ipfo_ptr = ipn;
 115
 116                 if (ioctl(natfd, SIOCADNAT, &obj) == -1)
 117                         perror("ioctl(SIOCADNAT)");
 118         }
 119 }
 120
 121
 122 void delnat(l4)
 123 l4cfg_t *l4;
 124 {
 125         ipnat_t *ipn = &l4->l4_nat;
 126
 127         printf("Remove NAT rule for %s/%#x,%u -> ",
 128                 inet_ntoa(ipn->in_out[0].in4), ipn->in_outmsk, ipn->in_pmin);
 129         printf("%s,%u\n", inet_ntoa(ipn->in_in[0].in4), ipn->in_pnext);
 130         if (!(opts & OPT_DONOTHING)) {
 131                 ipfobj_t obj;
 132
 133                 bzero(&obj, sizeof(obj));
 134                 obj.ipfo_rev = IPFILTER_VERSION;
 135                 obj.ipfo_size = sizeof(*ipn);
 136                 obj.ipfo_ptr = ipn;
 137
 138                 if (ioctl(natfd, SIOCRMNAT, &ipn) == -1)
 139                         perror("ioctl(SIOCRMNAT)");
 140         }
 141 }
 142
 143
 144 void connectl4(l4)
 145 l4cfg_t *l4;
 146 {
 147         l4->l4_rw = 1;
 148         l4->l4_rlen = 0;
 149         l4->l4_wlen = plen;
 150         if (!l4->l4_wlen) {
 151                 l4->l4_alive = 1;
 152                 addnat(l4);
 153         } else
 154                 l4->l4_wptr = probe;
 155 }
 156
 157
 158 void closel4(l4, dead)
 159 l4cfg_t *l4;
 160 int dead;
 161 {
 162         close(l4->l4_fd);
 163         l4->l4_fd = -1;
 164         l4->l4_rw = -1;
 165         if (dead && l4->l4_alive) {
 166                 l4->l4_alive = 0;
 167                 delnat(l4);
 168         }
 169 }
 170
 171
 172 void connectfd(l4)
 173 l4cfg_t *l4;
 174 {
 175         if (connect(l4->l4_fd, (struct sockaddr *)&l4->l4_sin,
 176                     sizeof(l4->l4_sin)) == -1) {
 177                 if (errno == EISCONN) {
 178                         if (opts & OPT_VERBOSE)
 179                                 fprintf(stderr, "Connected fd %d\n",
 180                                         l4->l4_fd);
 181                         connectl4(l4);
 182                         return;
 183                 }
 184                 if (opts & OPT_VERBOSE)
 185                         fprintf(stderr, "Connect failed fd %d: %s\n",
 186                                 l4->l4_fd, strerror(errno));
 187                 closel4(l4, 1);
 188                 return;
 189         }
 190         l4->l4_rw = 1;
 191 }
 192
 193
 194 void writefd(l4)
 195 l4cfg_t *l4;
 196 {
 197         int n, i, fd;
 198
 199         fd = l4->l4_fd;
 200
 201         if (l4->l4_rw == -2) {
 202                 connectfd(l4);
 203                 return;
 204         }
 205
 206         n = l4->l4_wlen;
 207
 208         i = send(fd, l4->l4_wptr, n, 0);
 209         if (i == 0 || i == -1) {
 210                 if (opts & OPT_VERBOSE)
 211                         fprintf(stderr, "Send on fd %d failed: %s\n",
 212                                 fd, strerror(errno));
 213                 closel4(l4, 1);
 214         } else {
 215                 l4->l4_wptr += i;
 216                 l4->l4_wlen -= i;
 217                 if (l4->l4_wlen == 0)
 218                         l4->l4_rw = 0;
 219                 if (opts & OPT_VERBOSE)
 220                         fprintf(stderr, "Sent %d bytes to fd %d\n", i, fd);
 221         }
 222 }
 223
 224
 225 void readfd(l4)
 226 l4cfg_t *l4;
 227 {
 228         char buf[80], *ptr;
 229         int n, i, fd;
 230
 231         fd = l4->l4_fd;
 232
 233         if (l4->l4_rw == -2) {
 234                 connectfd(l4);
 235                 return;
 236         }
 237
 238         if (l4->l4_rsize) {
 239                 n = l4->l4_rsize - l4->l4_rlen;
 240                 ptr = l4->l4_rbuf + l4->l4_rlen;
 241         } else {
 242                 n = sizeof(buf) - 1;
 243                 ptr = buf;
 244         }
 245
 246         if (opts & OPT_VERBOSE)
 247                 fprintf(stderr, "Read %d bytes on fd %d to %p\n",
 248                         n, fd, ptr);
 249         i = recv(fd, ptr, n, 0);
 250         if (i == 0 || i == -1) {
 251                 if (opts & OPT_VERBOSE)
 252                         fprintf(stderr, "Read error on fd %d: %s\n",
 253                                 fd, (i == 0) ? "EOF" : strerror(errno));
 254                 closel4(l4, 1);
 255         } else {
 256                 if (ptr == buf)
 257                         ptr[i] = '\0';
 258                 if (opts & OPT_VERBOSE)
 259                         fprintf(stderr, "%d: Read %d bytes [%*.*s]\n",
 260                                 fd, i, i, i, ptr);
 261                 if (ptr != buf) {
 262                         l4->l4_rlen += i;
 263                         if (l4->l4_rlen >= l4->l4_rsize) {
 264                                 if (!strncmp(response, l4->l4_rbuf,
 265                                              l4->l4_rsize)) {
 266                                         printf("%d: Good response\n",
 267                                                 fd);
 268                                         if (!l4->l4_alive) {
 269                                                 l4->l4_alive = 1;
 270                                                 addnat(l4);
 271                                         }
 272                                         closel4(l4, 0);
 273                                 } else {
 274                                         if (opts & OPT_VERBOSE)
 275                                                 printf("%d: Bad response\n",
 276                                                         fd);
 277                                         closel4(l4, 1);
 278                                 }
 279                         }
 280                 } else if (!l4->l4_alive) {
 281                         l4->l4_alive = 1;
 282                         addnat(l4);
 283                         closel4(l4, 0);
 284                 }
 285         }
 286 }
 287
 288
 289 int runconfig()
 290 {
 291         int fd, opt, res, mfd, i;
 292         struct timeval tv;
 293         time_t now, now1;
 294         fd_set rfd, wfd;
 295         l4cfg_t *l4;
 296
 297         mfd = 0;
 298         opt = 1;
 299         now = time(NULL);
 300
 301         /*
 302          * First, initiate connections that are closed, as required.
 303          */
 304         for (l4 = l4list; l4; l4 = l4->l4_next) {
 305                 if ((l4->l4_last + frequency < now) && (l4->l4_fd == -1)) {
 306                         l4->l4_last = now;
 307                         fd = socket(AF_INET, SOCK_STREAM, 0);
 308                         if (fd == -1)
 309                                 continue;
 310                         setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt,
 311                                    sizeof(opt));
 312 #ifdef  O_NONBLOCK
 313                         if ((res = fcntl(fd, F_GETFL, 0)) != -1)
 314                                 fcntl(fd, F_SETFL, res | O_NONBLOCK);
 315 #endif
 316                         if (opts & OPT_VERBOSE)
 317                                 fprintf(stderr,
 318                                         "Connecting to %s,%d (fd %d)...",
 319                                         inet_ntoa(l4->l4_sin.sin_addr),
 320                                         ntohs(l4->l4_sin.sin_port), fd);
 321                         if (connect(fd, (struct sockaddr *)&l4->l4_sin,
 322                                     sizeof(l4->l4_sin)) == -1) {
 323                                 if (errno != EINPROGRESS) {
 324                                         if (opts & OPT_VERBOSE)
 325                                                 fprintf(stderr, "failed\n");
 326                                         perror("connect");
 327                                         close(fd);
 328                                         fd = -1;
 329                                 } else {
 330                                         if (opts & OPT_VERBOSE)
 331                                                 fprintf(stderr, "waiting\n");
 332                                         l4->l4_rw = -2;
 333                                 }
 334                         } else {
 335                                 if (opts & OPT_VERBOSE)
 336                                         fprintf(stderr, "connected\n");
 337                                 connectl4(l4);
 338                         }
 339                         l4->l4_fd = fd;
 340                 }
 341         }
 342
 343         /*
 344          * Now look for fd's which we're expecting to read/write from.
 345          */
 346         FD_ZERO(&rfd);
 347         FD_ZERO(&wfd);
 348         tv.tv_sec = MIN(rtimeout, ctimeout);
 349         tv.tv_usec = 0;
 350
 351         for (l4 = l4list; l4; l4 = l4->l4_next)
 352                 if (l4->l4_rw == 0) {
 353                         if (now - l4->l4_last > rtimeout) {
 354                                 if (opts & OPT_VERBOSE)
 355                                         fprintf(stderr, "%d: Read timeout\n",
 356                                                 l4->l4_fd);
 357                                 closel4(l4, 1);
 358                                 continue;
 359                         }
 360                         if (opts & OPT_VERBOSE)
 361                                 fprintf(stderr, "Wait for read on fd %d\n",
 362                                         l4->l4_fd);
 363                         FD_SET(l4->l4_fd, &rfd);
 364                         if (l4->l4_fd > mfd)
 365                                 mfd = l4->l4_fd;
 366                 } else if ((l4->l4_rw == 1 && l4->l4_wlen) ||
 367                            l4->l4_rw == -2) {
 368                         if ((l4->l4_rw == -2) &&
 369                             (now - l4->l4_last > ctimeout)) {
 370                                 if (opts & OPT_VERBOSE)
 371                                         fprintf(stderr,
 372                                                 "%d: connect timeout\n",
 373                                                 l4->l4_fd);
 374                                 closel4(l4);
 375                                 continue;
 376                         }
 377                         if (opts & OPT_VERBOSE)
 378                                 fprintf(stderr, "Wait for write on fd %d\n",
 379                                         l4->l4_fd);
 380                         FD_SET(l4->l4_fd, &wfd);
 381                         if (l4->l4_fd > mfd)
 382                                 mfd = l4->l4_fd;
 383                 }
 384
 385         if (opts & OPT_VERBOSE)
 386                 fprintf(stderr, "Select: max fd %d wait %d\n", mfd + 1,
 387                         tv.tv_sec);
 388         i = select(mfd + 1, &rfd, &wfd, NULL, &tv);
 389         if (i == -1) {
 390                 perror("select");
 391                 return -1;
 392         }
 393
 394         now1 = time(NULL);
 395
 396         for (l4 = l4list; (i > 0) && l4; l4 = l4->l4_next) {
 397                 if (l4->l4_fd < 0)
 398                         continue;
 399                 if (FD_ISSET(l4->l4_fd, &rfd)) {
 400                         if (opts & OPT_VERBOSE)
 401                                 fprintf(stderr, "Ready to read on fd %d\n",
 402                                         l4->l4_fd);
 403                         readfd(l4);
 404                         i--;
 405                 }
 406
 407                 if ((l4->l4_fd >= 0) && FD_ISSET(l4->l4_fd, &wfd)) {
 408                         if (opts & OPT_VERBOSE)
 409                                 fprintf(stderr, "Ready to write on fd %d\n",
 410                                         l4->l4_fd);
 411                         writefd(l4);
 412                         i--;
 413                 }
 414         }
 415         return 0;
 416 }
 417
 418
 419 int gethostport(str, lnum, ipp, portp)
 420 char *str;
 421 int lnum;
 422 u_32_t *ipp;
 423 u_short *portp;
 424 {
 425         struct servent *sp;
 426         struct hostent *hp;
 427         char *host, *port;
 428
 429         host = str;
 430         port = strchr(host, ',');
 431         if (port)
 432                 *port++ = '\0';
 433
 434 #ifdef  HAVE_INET_ATON
 435         if (ISDIGIT(*host) && inet_aton(host, &ip))
 436                 *ipp = ip.s_addr;
 437 #else
 438         if (ISDIGIT(*host))
 439                 *ipp = inet_addr(host);
 440 #endif
 441         else {
 442                 if (!(hp = gethostbyname(host))) {
 443                         fprintf(stderr, "%d: can't resolve hostname: %s\n",
 444                                 lnum, host);
 445                         return 0;
 446                 }
 447                 *ipp = *(u_32_t *)hp->h_addr;
 448         }
 449
 450         if (port) {
 451                 if (ISDIGIT(*port))
 452                         *portp = htons(atoi(port));
 453                 else {
 454                         sp = getservbyname(port, "tcp");
 455                         if (sp)
 456                                 *portp = sp->s_port;
 457                         else {
 458                                 fprintf(stderr, "%d: unknown service %s\n",
 459                                         lnum, port);
 460                                 return 0;
 461                         }
 462                 }
 463         } else
 464                 *portp = 0;
 465         return 1;
 466 }
 467
 468
 469 char *mapfile(file, sizep)
 470 char *file;
 471 size_t *sizep;
 472 {
 473         struct stat sb;
 474         caddr_t addr;
 475         int fd;
 476
 477         fd = open(file, O_RDONLY);
 478         if (fd == -1) {
 479                 perror("open(mapfile)");
 480                 return NULL;
 481         }
 482
 483         if (fstat(fd, &sb) == -1) {
 484                 perror("fstat(mapfile)");
 485                 close(fd);
 486                 return NULL;
 487         }
 488
 489         addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
 490         if (addr == (caddr_t)-1) {
 491                 perror("mmap(mapfile)");
 492                 close(fd);
 493                 return NULL;
 494         }
 495         close(fd);
 496         *sizep = sb.st_size;
 497         return (char *)addr;
 498 }
 499
 500
 501 int readconfig(filename)
 502 char *filename;
 503 {
 504         char c, buf[512], *s, *t, *errtxt = NULL, *line;
 505         int num, err = 0;
 506         ipnat_t *ipn;
 507         l4cfg_t *l4;
 508         FILE *fp;
 509
 510         fp = fopen(filename, "r");
 511         if (!fp) {
 512                 perror("open(configfile)");
 513                 return -1;
 514         }
 515
 516         bzero((char *)&template, sizeof(template));
 517         template.l4_fd = -1;
 518         template.l4_rw = -1;
 519         template.l4_sin.sin_family = AF_INET;
 520         ipn = &template.l4_nat;
 521         ipn->in_flags = IPN_TCP|IPN_ROUNDR;
 522         ipn->in_redir = NAT_REDIRECT;
 523
 524         for (num = 1; fgets(buf, sizeof(buf), fp); num++) {
 525                 s = strchr(buf, '\n');
 526                 if  (!s) {
 527                         fprintf(stderr, "%d: line too long\n", num);
 528                         fclose(fp);
 529                         return -1;
 530                 }
 531
 532                 *s = '\0';
 533
 534                 /*
 535                  * lines which are comments
 536                  */
 537                 s = strchr(buf, '#');
 538                 if (s)
 539                         *s = '\0';
 540
 541                 /*
 542                  * Skip leading whitespace
 543                  */
 544                 for (line = buf; (c = *line) && ISSPACE(c); line++)
 545                         ;
 546                 if (!*line)
 547                         continue;
 548
 549                 if (opts & OPT_VERBOSE)
 550                         fprintf(stderr, "Parsing: [%s]\n", line);
 551                 t = strtok(line, " \t");
 552                 if (!t)
 553                         continue;
 554                 if (!strcasecmp(t, "interface")) {
 555                         s = strtok(NULL, " \t");
 556                         if (s)
 557                                 t = strtok(NULL, "\t");
 558                         if (!s || !t) {
 559                                 errtxt = line;
 560                                 err = -1;
 561                                 break;
 562                         }
 563
 564                         if (!strchr(t, ',')) {
 565                                 fprintf(stderr,
 566                                         "%d: local address,port missing\n",
 567                                         num);
 568                                 err = -1;
 569                                 break;
 570                         }
 571
 572                         strncpy(ipn->in_ifnames[0], s, LIFNAMSIZ);
 573                         strncpy(ipn->in_ifnames[1], s, LIFNAMSIZ);
 574                         if (!gethostport(t, num, &ipn->in_outip,
 575                                          &ipn->in_pmin)) {
 576                                 errtxt = line;
 577                                 err = -1;
 578                                 break;
 579                         }
 580                         ipn->in_outmsk = 0xffffffff;
 581                         ipn->in_pmax = ipn->in_pmin;
 582                         if (opts & OPT_VERBOSE)
 583                                 fprintf(stderr,
 584                                         "Interface %s %s/%#x port %u\n",
 585                                         ipn->in_ifnames[0],
 586                                         inet_ntoa(ipn->in_out[0].in4),
 587                                         ipn->in_outmsk, ipn->in_pmin);
 588                 } else if (!strcasecmp(t, "remote")) {
 589                         if (!*ipn->in_ifnames[0]) {
 590                                 fprintf(stderr,
 591                                         "%d: ifname not set prior to remote\n",
 592                                         num);
 593                                 err = -1;
 594                                 break;
 595                         }
 596                         s = strtok(NULL, " \t");
 597                         if (s)
 598                                 t = strtok(NULL, "");
 599                         if (!s || !t || strcasecmp(s, "server")) {
 600                                 errtxt = line;
 601                                 err = -1;
 602                                 break;
 603                         }
 604
 605                         ipn->in_pnext = 0;
 606                         if (!gethostport(t, num, &ipn->in_inip,
 607                                          &ipn->in_pnext)) {
 608                                 errtxt = line;
 609                                 err = -1;
 610                                 break;
 611                         }
 612                         ipn->in_inmsk = 0xffffffff;
 613                         if (ipn->in_pnext == 0)
 614                                 ipn->in_pnext = ipn->in_pmin;
 615
 616                         l4 = (l4cfg_t *)malloc(sizeof(*l4));
 617                         if (!l4) {
 618                                 fprintf(stderr, "%d: out of memory (%d)\n",
 619                                         num, sizeof(*l4));
 620                                 err = -1;
 621                                 break;
 622                         }
 623                         bcopy((char *)&template, (char *)l4, sizeof(*l4));
 624                         l4->l4_sin.sin_addr = ipn->in_in[0].in4;
 625                         l4->l4_sin.sin_port = ipn->in_pnext;
 626                         l4->l4_next = l4list;
 627                         l4list = l4;
 628                 } else if (!strcasecmp(t, "connect")) {
 629                         s = strtok(NULL, " \t");
 630                         if (s)
 631                                 t = strtok(NULL, "\t");
 632                         if (!s || !t) {
 633                                 errtxt = line;
 634                                 err = -1;
 635                                 break;
 636                         } else if (!strcasecmp(s, "timeout")) {
 637                                 ctimeout = atoi(t);
 638                                 if (opts & OPT_VERBOSE)
 639                                         fprintf(stderr, "connect timeout %d\n",
 640                                                 ctimeout);
 641                         } else if (!strcasecmp(s, "frequency")) {
 642                                 frequency = atoi(t);
 643                                 if (opts & OPT_VERBOSE)
 644                                         fprintf(stderr,
 645                                                 "connect frequency %d\n",
 646                                                 frequency);
 647                         } else {
 648                                 errtxt = line;
 649                                 err = -1;
 650                                 break;
 651                         }
 652                 } else if (!strcasecmp(t, "probe")) {
 653                         s = strtok(NULL, " \t");
 654                         if (!s) {
 655                                 errtxt = line;
 656                                 err = -1;
 657                                 break;
 658                         } else if (!strcasecmp(s, "string")) {
 659                                 if (probe) {
 660                                         fprintf(stderr,
 661                                                 "%d: probe already set\n",
 662                                                 num);
 663                                         err = -1;
 664                                         break;
 665                                 }
 666                                 t = strtok(NULL, "");
 667                                 if (!t) {
 668                                         fprintf(stderr,
 669                                                 "%d: No probe string\n", num);
 670                                         err = -1;
 671                                         break;
 672                                 }
 673
 674                                 probe = malloc(strlen(t));
 675                                 copystr(probe, t);
 676                                 plen = strlen(probe);
 677                                 if (opts & OPT_VERBOSE)
 678                                         fprintf(stderr, "Probe string [%s]\n",
 679                                                 probe);
 680                         } else if (!strcasecmp(s, "file")) {
 681                                 t = strtok(NULL, " \t");
 682                                 if (!t) {
 683                                         errtxt = line;
 684                                         err = -1;
 685                                         break;
 686                                 }
 687                                 if (probe) {
 688                                         fprintf(stderr,
 689                                                 "%d: probe already set\n",
 690                                                 num);
 691                                         err = -1;
 692                                         break;
 693                                 }
 694                                 probe = mapfile(t, &plen);
 695                                 if (opts & OPT_VERBOSE)
 696                                         fprintf(stderr,
 697                                                 "Probe file %s len %u@%p\n",
 698                                                 t, plen, probe);
 699                         }
 700                 } else if (!strcasecmp(t, "response")) {
 701                         s = strtok(NULL, " \t");
 702                         if (!s) {
 703                                 errtxt = line;
 704                                 err = -1;
 705                                 break;
 706                         } else if (!strcasecmp(s, "timeout")) {
 707                                 t = strtok(NULL, " \t");
 708                                 if (!t) {
 709                                         errtxt = line;
 710                                         err = -1;
 711                                         break;
 712                                 }
 713                                 rtimeout = atoi(t);
 714                                 if (opts & OPT_VERBOSE)
 715                                         fprintf(stderr,
 716                                                 "response timeout %d\n",
 717                                                 rtimeout);
 718                         } else if (!strcasecmp(s, "string")) {
 719                                 if (response) {
 720                                         fprintf(stderr,
 721                                                 "%d: response already set\n",
 722                                                 num);
 723                                         err = -1;
 724                                         break;
 725                                 }
 726                                 response = strdup(strtok(NULL, ""));
 727                                 rlen = strlen(response);
 728                                 template.l4_rsize = rlen;
 729                                 template.l4_rbuf = malloc(rlen);
 730                                 if (opts & OPT_VERBOSE)
 731                                         fprintf(stderr,
 732                                                 "Response string [%s]\n",
 733                                                 response);
 734                         } else if (!strcasecmp(s, "file")) {
 735                                 t = strtok(NULL, " \t");
 736                                 if (!t) {
 737                                         errtxt = line;
 738                                         err = -1;
 739                                         break;
 740                                 }
 741                                 if (response) {
 742                                         fprintf(stderr,
 743                                                 "%d: response already set\n",
 744                                                 num);
 745                                         err = -1;
 746                                         break;
 747                                 }
 748                                 response = mapfile(t, &rlen);
 749                                 template.l4_rsize = rlen;
 750                                 template.l4_rbuf = malloc(rlen);
 751                                 if (opts & OPT_VERBOSE)
 752                                         fprintf(stderr,
 753                                                 "Response file %s len %u@%p\n",
 754                                                 t, rlen, response);
 755                         }
 756                 } else {
 757                         errtxt = line;
 758                         err = -1;
 759                         break;
 760                 }
 761         }
 762
 763         if (errtxt)
 764                 fprintf(stderr, "%d: syntax error at \"%s\"\n", num, errtxt);
 765         fclose(fp);
 766         return err;
 767 }
 768
 769
 770 void usage(prog)
 771 char *prog;
 772 {
 773         fprintf(stderr, "Usage: %s -f <configfile>\n", prog);
 774         exit(1);
 775 }
 776
 777
 778 int main(argc, argv)
 779 int argc;
 780 char *argv[];
 781 {
 782         char *config = NULL;
 783         int c;
 784
 785         while ((c = getopt(argc, argv, "f:nv")) != -1)
 786                 switch (c)
 787                 {
 788                 case 'f' :
 789                         config = optarg;
 790                         break;
 791                 case 'n' :
 792                         opts |= OPT_DONOTHING;
 793                         break;
 794                 case 'v' :
 795                         opts |= OPT_VERBOSE;
 796                         break;
 797                 }
 798
 799         if (config == NULL)
 800                 usage(argv[0]);
 801
 802         if (readconfig(config))
 803                 exit(1);
 804
 805         if (!l4list) {
 806                 fprintf(stderr, "No remote servers, exiting.");
 807                 exit(1);
 808         }
 809
 810         if (!(opts & OPT_DONOTHING)) {
 811                 natfd = open(IPNAT_NAME, O_RDWR);
 812                 if (natfd == -1) {
 813                         perror("open(IPL_NAT)");
 814                         exit(1);
 815                 }
 816         }
 817
 818         if (opts & OPT_VERBOSE)
 819                 fprintf(stderr, "Starting...\n");
 820         while (runconfig() == 0)
 821                 ;
 822
 823         exit(1);
 824 }