1 /* 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23 #include <sys/param.h> 24 #include <sys/mbuf.h> 25 #include <sys/socket.h> 26 #include <sys/sockio.h> 27 #include <sys/sysctl.h> 28 #include <sys/time.h> 29 #include <sys/wait.h> 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <errno.h> 34 #include <grp.h> 35 #include <limits.h> 36 #include <netdb.h> 37 #include <pwd.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <stdarg.h> 42 #include <string.h> 43 #include <timeconv.h> /* XXX do we need this ? */ 44 #include <unistd.h> 45 #include <sysexits.h> 46 47 #include <net/if.h> 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/ip_icmp.h> 52 #include <netinet/ip_fw.h> 53 #include <netinet/ip_dummynet.h> 54 #include <netinet/tcp.h> 55 #include <arpa/inet.h> 56 57 int 58 do_resolv, /* Would try to resolve all */ 59 do_time, /* Show time stamps */ 60 do_quiet, /* Be quiet in add and flush */ 61 do_pipe, /* this cmd refers to a pipe */ 62 do_sort, /* field to sort results (0 = no) */ 63 do_dynamic, /* display dynamic rules */ 64 do_expired, /* display expired dynamic rules */ 65 do_compact, /* show rules in compact mode */ 66 do_force, /* do not ask for confirmation */ 67 show_sets, /* display rule sets */ 68 test_only, /* only check syntax */ 69 comment_only, /* only print action and comment */ 70 verbose; 71 72 #define IP_MASK_ALL 0xffffffff 73 /* 74 * the following macro returns an error message if we run out of 75 * arguments. 76 */ 77 #define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 78 79 /* 80 * _s_x is a structure that stores a string <-> token pairs, used in 81 * various places in the parser. Entries are stored in arrays, 82 * with an entry with s=NULL as terminator. 83 * The search routines are match_token() and match_value(). 84 * Often, an element with x=0 contains an error string. 85 * 86 */ 87 struct _s_x { 88 char const *s; 89 int x; 90 }; 91 92 static struct _s_x f_tcpflags[] = { 93 { "syn", TH_SYN }, 94 { "fin", TH_FIN }, 95 { "ack", TH_ACK }, 96 { "psh", TH_PUSH }, 97 { "rst", TH_RST }, 98 { "urg", TH_URG }, 99 { "tcp flag", 0 }, 100 { NULL, 0 } 101 }; 102 103 static struct _s_x f_tcpopts[] = { 104 { "mss", IP_FW_TCPOPT_MSS }, 105 { "maxseg", IP_FW_TCPOPT_MSS }, 106 { "window", IP_FW_TCPOPT_WINDOW }, 107 { "sack", IP_FW_TCPOPT_SACK }, 108 { "ts", IP_FW_TCPOPT_TS }, 109 { "timestamp", IP_FW_TCPOPT_TS }, 110 { "cc", IP_FW_TCPOPT_CC }, 111 { "tcp option", 0 }, 112 { NULL, 0 } 113 }; 114 115 /* 116 * IP options span the range 0 to 255 so we need to remap them 117 * (though in fact only the low 5 bits are significant). 118 */ 119 static struct _s_x f_ipopts[] = { 120 { "ssrr", IP_FW_IPOPT_SSRR}, 121 { "lsrr", IP_FW_IPOPT_LSRR}, 122 { "rr", IP_FW_IPOPT_RR}, 123 { "ts", IP_FW_IPOPT_TS}, 124 { "ip option", 0 }, 125 { NULL, 0 } 126 }; 127 128 static struct _s_x f_iptos[] = { 129 { "lowdelay", IPTOS_LOWDELAY}, 130 { "throughput", IPTOS_THROUGHPUT}, 131 { "reliability", IPTOS_RELIABILITY}, 132 { "mincost", IPTOS_MINCOST}, 133 { "congestion", IPTOS_CE}, 134 { "ecntransport", IPTOS_ECT}, 135 { "ip tos option", 0}, 136 { NULL, 0 } 137 }; 138 139 static struct _s_x limit_masks[] = { 140 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 141 {"src-addr", DYN_SRC_ADDR}, 142 {"src-port", DYN_SRC_PORT}, 143 {"dst-addr", DYN_DST_ADDR}, 144 {"dst-port", DYN_DST_PORT}, 145 {NULL, 0} 146 }; 147 148 /* 149 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 150 * This is only used in this code. 151 */ 152 #define IPPROTO_ETHERTYPE 0x1000 153 static struct _s_x ether_types[] = { 154 /* 155 * Note, we cannot use "-:&/" in the names because they are field 156 * separators in the type specifications. Also, we use s = NULL as 157 * end-delimiter, because a type of 0 can be legal. 158 */ 159 { "ip", 0x0800 }, 160 { "ipv4", 0x0800 }, 161 { "ipv6", 0x86dd }, 162 { "arp", 0x0806 }, 163 { "rarp", 0x8035 }, 164 { "vlan", 0x8100 }, 165 { "loop", 0x9000 }, 166 { "trail", 0x1000 }, 167 { "at", 0x809b }, 168 { "atalk", 0x809b }, 169 { "aarp", 0x80f3 }, 170 { "pppoe_disc", 0x8863 }, 171 { "pppoe_sess", 0x8864 }, 172 { "ipx_8022", 0x00E0 }, 173 { "ipx_8023", 0x0000 }, 174 { "ipx_ii", 0x8137 }, 175 { "ipx_snap", 0x8137 }, 176 { "ipx", 0x8137 }, 177 { "ns", 0x0600 }, 178 { NULL, 0 } 179 }; 180 181 static void show_usage(void); 182 183 enum tokens { 184 TOK_NULL=0, 185 186 TOK_OR, 187 TOK_NOT, 188 TOK_STARTBRACE, 189 TOK_ENDBRACE, 190 191 TOK_ACCEPT, 192 TOK_COUNT, 193 TOK_PIPE, 194 TOK_QUEUE, 195 TOK_DIVERT, 196 TOK_TEE, 197 TOK_FORWARD, 198 TOK_SKIPTO, 199 TOK_DENY, 200 TOK_REJECT, 201 TOK_RESET, 202 TOK_UNREACH, 203 TOK_CHECKSTATE, 204 205 TOK_UID, 206 TOK_GID, 207 TOK_JAIL, 208 TOK_IN, 209 TOK_LIMIT, 210 TOK_KEEPSTATE, 211 TOK_LAYER2, 212 TOK_OUT, 213 TOK_XMIT, 214 TOK_RECV, 215 TOK_VIA, 216 TOK_FRAG, 217 TOK_IPOPTS, 218 TOK_IPLEN, 219 TOK_IPID, 220 TOK_IPPRECEDENCE, 221 TOK_IPTOS, 222 TOK_IPTTL, 223 TOK_IPVER, 224 TOK_ESTAB, 225 TOK_SETUP, 226 TOK_TCPFLAGS, 227 TOK_TCPOPTS, 228 TOK_TCPSEQ, 229 TOK_TCPACK, 230 TOK_TCPWIN, 231 TOK_ICMPTYPES, 232 TOK_MAC, 233 TOK_MACTYPE, 234 TOK_VERREVPATH, 235 TOK_VERSRCREACH, 236 TOK_ANTISPOOF, 237 TOK_IPSEC, 238 TOK_COMMENT, 239 240 TOK_PLR, 241 TOK_NOERROR, 242 TOK_BUCKETS, 243 TOK_DSTIP, 244 TOK_SRCIP, 245 TOK_DSTPORT, 246 TOK_SRCPORT, 247 TOK_ALL, 248 TOK_MASK, 249 TOK_BW, 250 TOK_DELAY, 251 TOK_RED, 252 TOK_GRED, 253 TOK_DROPTAIL, 254 TOK_PROTO, 255 TOK_WEIGHT, 256 }; 257 258 struct _s_x dummynet_params[] = { 259 { "plr", TOK_PLR }, 260 { "noerror", TOK_NOERROR }, 261 { "buckets", TOK_BUCKETS }, 262 { "dst-ip", TOK_DSTIP }, 263 { "src-ip", TOK_SRCIP }, 264 { "dst-port", TOK_DSTPORT }, 265 { "src-port", TOK_SRCPORT }, 266 { "proto", TOK_PROTO }, 267 { "weight", TOK_WEIGHT }, 268 { "all", TOK_ALL }, 269 { "mask", TOK_MASK }, 270 { "droptail", TOK_DROPTAIL }, 271 { "red", TOK_RED }, 272 { "gred", TOK_GRED }, 273 { "bw", TOK_BW }, 274 { "bandwidth", TOK_BW }, 275 { "delay", TOK_DELAY }, 276 { "pipe", TOK_PIPE }, 277 { "queue", TOK_QUEUE }, 278 { "dummynet-params", TOK_NULL }, 279 { NULL, 0 } /* terminator */ 280 }; 281 282 struct _s_x rule_actions[] = { 283 { "accept", TOK_ACCEPT }, 284 { "pass", TOK_ACCEPT }, 285 { "allow", TOK_ACCEPT }, 286 { "permit", TOK_ACCEPT }, 287 { "count", TOK_COUNT }, 288 { "pipe", TOK_PIPE }, 289 { "queue", TOK_QUEUE }, 290 { "divert", TOK_DIVERT }, 291 { "tee", TOK_TEE }, 292 { "fwd", TOK_FORWARD }, 293 { "forward", TOK_FORWARD }, 294 { "skipto", TOK_SKIPTO }, 295 { "deny", TOK_DENY }, 296 { "drop", TOK_DENY }, 297 { "reject", TOK_REJECT }, 298 { "reset", TOK_RESET }, 299 { "unreach", TOK_UNREACH }, 300 { "check-state", TOK_CHECKSTATE }, 301 { "//", TOK_COMMENT }, 302 { NULL, 0 } /* terminator */ 303 }; 304 305 struct _s_x rule_options[] = { 306 { "uid", TOK_UID }, 307 { "gid", TOK_GID }, 308 { "jail", TOK_JAIL }, 309 { "in", TOK_IN }, 310 { "limit", TOK_LIMIT }, 311 { "keep-state", TOK_KEEPSTATE }, 312 { "bridged", TOK_LAYER2 }, 313 { "layer2", TOK_LAYER2 }, 314 { "out", TOK_OUT }, 315 { "xmit", TOK_XMIT }, 316 { "recv", TOK_RECV }, 317 { "via", TOK_VIA }, 318 { "fragment", TOK_FRAG }, 319 { "frag", TOK_FRAG }, 320 { "ipoptions", TOK_IPOPTS }, 321 { "ipopts", TOK_IPOPTS }, 322 { "iplen", TOK_IPLEN }, 323 { "ipid", TOK_IPID }, 324 { "ipprecedence", TOK_IPPRECEDENCE }, 325 { "iptos", TOK_IPTOS }, 326 { "ipttl", TOK_IPTTL }, 327 { "ipversion", TOK_IPVER }, 328 { "ipver", TOK_IPVER }, 329 { "estab", TOK_ESTAB }, 330 { "established", TOK_ESTAB }, 331 { "setup", TOK_SETUP }, 332 { "tcpflags", TOK_TCPFLAGS }, 333 { "tcpflgs", TOK_TCPFLAGS }, 334 { "tcpoptions", TOK_TCPOPTS }, 335 { "tcpopts", TOK_TCPOPTS }, 336 { "tcpseq", TOK_TCPSEQ }, 337 { "tcpack", TOK_TCPACK }, 338 { "tcpwin", TOK_TCPWIN }, 339 { "icmptype", TOK_ICMPTYPES }, 340 { "icmptypes", TOK_ICMPTYPES }, 341 { "dst-ip", TOK_DSTIP }, 342 { "src-ip", TOK_SRCIP }, 343 { "dst-port", TOK_DSTPORT }, 344 { "src-port", TOK_SRCPORT }, 345 { "proto", TOK_PROTO }, 346 { "MAC", TOK_MAC }, 347 { "mac", TOK_MAC }, 348 { "mac-type", TOK_MACTYPE }, 349 { "verrevpath", TOK_VERREVPATH }, 350 { "versrcreach", TOK_VERSRCREACH }, 351 { "antispoof", TOK_ANTISPOOF }, 352 { "ipsec", TOK_IPSEC }, 353 { "//", TOK_COMMENT }, 354 355 { "not", TOK_NOT }, /* pseudo option */ 356 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 357 { "or", TOK_OR }, /* pseudo option */ 358 { "|", /* escape */ TOK_OR }, /* pseudo option */ 359 { "{", TOK_STARTBRACE }, /* pseudo option */ 360 { "(", TOK_STARTBRACE }, /* pseudo option */ 361 { "}", TOK_ENDBRACE }, /* pseudo option */ 362 { ")", TOK_ENDBRACE }, /* pseudo option */ 363 { NULL, 0 } /* terminator */ 364 }; 365 366 static __inline uint64_t 367 align_uint64(uint64_t *pll) { 368 uint64_t ret; 369 370 bcopy (pll, &ret, sizeof(ret)); 371 return ret; 372 } 373 374 /* 375 * conditionally runs the command. 376 */ 377 static int 378 do_cmd(int optname, void *optval, uintptr_t optlen) 379 { 380 static int s = -1; /* the socket */ 381 int i; 382 383 if (test_only) 384 return 0; 385 386 if (s == -1) 387 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 388 if (s < 0) 389 err(EX_UNAVAILABLE, "socket"); 390 391 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 392 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 393 optname == IP_FW_TABLE_GETSIZE) 394 i = getsockopt(s, IPPROTO_IP, optname, optval, 395 (socklen_t *)optlen); 396 else 397 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 398 return i; 399 } 400 401 /** 402 * match_token takes a table and a string, returns the value associated 403 * with the string (-1 in case of failure). 404 */ 405 static int 406 match_token(struct _s_x *table, char *string) 407 { 408 struct _s_x *pt; 409 uint i = strlen(string); 410 411 for (pt = table ; i && pt->s != NULL ; pt++) 412 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 413 return pt->x; 414 return -1; 415 } 416 417 /** 418 * match_value takes a table and a value, returns the string associated 419 * with the value (NULL in case of failure). 420 */ 421 static char const * 422 match_value(struct _s_x *p, int value) 423 { 424 for (; p->s != NULL; p++) 425 if (p->x == value) 426 return p->s; 427 return NULL; 428 } 429 430 /* 431 * prints one port, symbolic or numeric 432 */ 433 static void 434 print_port(int proto, uint16_t port) 435 { 436 437 if (proto == IPPROTO_ETHERTYPE) { 438 char const *s; 439 440 if (do_resolv && (s = match_value(ether_types, port)) ) 441 printf("%s", s); 442 else 443 printf("0x%04x", port); 444 } else { 445 struct servent *se = NULL; 446 if (do_resolv) { 447 struct protoent *pe = getprotobynumber(proto); 448 449 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 450 } 451 if (se) 452 printf("%s", se->s_name); 453 else 454 printf("%d", port); 455 } 456 } 457 458 struct _s_x _port_name[] = { 459 {"dst-port", O_IP_DSTPORT}, 460 {"src-port", O_IP_SRCPORT}, 461 {"ipid", O_IPID}, 462 {"iplen", O_IPLEN}, 463 {"ipttl", O_IPTTL}, 464 {"mac-type", O_MAC_TYPE}, 465 {NULL, 0} 466 }; 467 468 /* 469 * Print the values in a list 16-bit items of the types above. 470 * XXX todo: add support for mask. 471 */ 472 static void 473 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 474 { 475 uint16_t *p = cmd->ports; 476 int i; 477 char const *sep; 478 479 if (cmd->o.len & F_NOT) 480 printf(" not"); 481 if (opcode != 0) { 482 sep = match_value(_port_name, opcode); 483 if (sep == NULL) 484 sep = "???"; 485 printf (" %s", sep); 486 } 487 sep = " "; 488 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 489 printf(sep); 490 print_port(proto, p[0]); 491 if (p[0] != p[1]) { 492 printf("-"); 493 print_port(proto, p[1]); 494 } 495 sep = ","; 496 } 497 } 498 499 /* 500 * Like strtol, but also translates service names into port numbers 501 * for some protocols. 502 * In particular: 503 * proto == -1 disables the protocol check; 504 * proto == IPPROTO_ETHERTYPE looks up an internal table 505 * proto == <some value in /etc/protocols> matches the values there. 506 * Returns *end == s in case the parameter is not found. 507 */ 508 static int 509 strtoport(char *s, char **end, int base, int proto) 510 { 511 char *p, *buf; 512 char *s1; 513 int i; 514 515 *end = s; /* default - not found */ 516 if (*s == '\0') 517 return 0; /* not found */ 518 519 if (isdigit(*s)) 520 return strtol(s, end, base); 521 522 /* 523 * find separator. '\\' escapes the next char. 524 */ 525 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 526 if (*s1 == '\\' && s1[1] != '\0') 527 s1++; 528 529 buf = malloc(s1 - s + 1); 530 if (buf == NULL) 531 return 0; 532 533 /* 534 * copy into a buffer skipping backslashes 535 */ 536 for (p = s, i = 0; p != s1 ; p++) 537 if (*p != '\\') 538 buf[i++] = *p; 539 buf[i++] = '\0'; 540 541 if (proto == IPPROTO_ETHERTYPE) { 542 i = match_token(ether_types, buf); 543 free(buf); 544 if (i != -1) { /* found */ 545 *end = s1; 546 return i; 547 } 548 } else { 549 struct protoent *pe = NULL; 550 struct servent *se; 551 552 if (proto != 0) 553 pe = getprotobynumber(proto); 554 setservent(1); 555 se = getservbyname(buf, pe ? pe->p_name : NULL); 556 free(buf); 557 if (se != NULL) { 558 *end = s1; 559 return ntohs(se->s_port); 560 } 561 } 562 return 0; /* not found */ 563 } 564 565 /* 566 * Fill the body of the command with the list of port ranges. 567 */ 568 static int 569 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 570 { 571 uint16_t a, b, *p = cmd->ports; 572 int i = 0; 573 char *s = av; 574 575 while (*s) { 576 a = strtoport(av, &s, 0, proto); 577 if (s == av) /* no parameter */ 578 break; 579 if (*s == '-') { /* a range */ 580 av = s+1; 581 b = strtoport(av, &s, 0, proto); 582 if (s == av) /* no parameter */ 583 break; 584 p[0] = a; 585 p[1] = b; 586 } else if (*s == ',' || *s == '\0' ) 587 p[0] = p[1] = a; 588 else /* invalid separator */ 589 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 590 *s, av); 591 i++; 592 p += 2; 593 av = s+1; 594 } 595 if (i > 0) { 596 if (i+1 > F_LEN_MASK) 597 errx(EX_DATAERR, "too many ports/ranges\n"); 598 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 599 } 600 return i; 601 } 602 603 static struct _s_x icmpcodes[] = { 604 { "net", ICMP_UNREACH_NET }, 605 { "host", ICMP_UNREACH_HOST }, 606 { "protocol", ICMP_UNREACH_PROTOCOL }, 607 { "port", ICMP_UNREACH_PORT }, 608 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 609 { "srcfail", ICMP_UNREACH_SRCFAIL }, 610 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 611 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 612 { "isolated", ICMP_UNREACH_ISOLATED }, 613 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 614 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 615 { "tosnet", ICMP_UNREACH_TOSNET }, 616 { "toshost", ICMP_UNREACH_TOSHOST }, 617 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 618 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 619 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 620 { NULL, 0 } 621 }; 622 623 static void 624 fill_reject_code(u_short *codep, char *str) 625 { 626 int val; 627 char *s; 628 629 val = strtoul(str, &s, 0); 630 if (s == str || *s != '\0' || val >= 0x100) 631 val = match_token(icmpcodes, str); 632 if (val < 0) 633 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 634 *codep = val; 635 return; 636 } 637 638 static void 639 print_reject_code(uint16_t code) 640 { 641 char const *s = match_value(icmpcodes, code); 642 643 if (s != NULL) 644 printf("unreach %s", s); 645 else 646 printf("unreach %u", code); 647 } 648 649 /* 650 * Returns the number of bits set (from left) in a contiguous bitmask, 651 * or -1 if the mask is not contiguous. 652 * XXX this needs a proper fix. 653 * This effectively works on masks in big-endian (network) format. 654 * when compiled on little endian architectures. 655 * 656 * First bit is bit 7 of the first byte -- note, for MAC addresses, 657 * the first bit on the wire is bit 0 of the first byte. 658 * len is the max length in bits. 659 */ 660 static int 661 contigmask(uint8_t *p, int len) 662 { 663 int i, n; 664 665 for (i=0; i<len ; i++) 666 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 667 break; 668 for (n=i+1; n < len; n++) 669 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 670 return -1; /* mask not contiguous */ 671 return i; 672 } 673 674 /* 675 * print flags set/clear in the two bitmasks passed as parameters. 676 * There is a specialized check for f_tcpflags. 677 */ 678 static void 679 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 680 { 681 char const *comma = ""; 682 int i; 683 uint8_t set = cmd->arg1 & 0xff; 684 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 685 686 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 687 printf(" setup"); 688 return; 689 } 690 691 printf(" %s ", name); 692 for (i=0; list[i].x != 0; i++) { 693 if (set & list[i].x) { 694 set &= ~list[i].x; 695 printf("%s%s", comma, list[i].s); 696 comma = ","; 697 } 698 if (clear & list[i].x) { 699 clear &= ~list[i].x; 700 printf("%s!%s", comma, list[i].s); 701 comma = ","; 702 } 703 } 704 } 705 706 /* 707 * Print the ip address contained in a command. 708 */ 709 static void 710 print_ip(ipfw_insn_ip *cmd, char const *s) 711 { 712 struct hostent *he = NULL; 713 int len = F_LEN((ipfw_insn *)cmd); 714 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 715 716 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 717 718 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 719 printf("me"); 720 return; 721 } 722 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 723 cmd->o.opcode == O_IP_DST_LOOKUP) { 724 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 725 if (len == F_INSN_SIZE(ipfw_insn_u32)) 726 printf(",%u", *a); 727 printf(")"); 728 return; 729 } 730 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 731 uint32_t x, *map = (uint32_t *)&(cmd->mask); 732 int i, j; 733 char comma = '{'; 734 735 x = cmd->o.arg1 - 1; 736 x = htonl( ~x ); 737 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 738 printf("%s/%d", inet_ntoa(cmd->addr), 739 contigmask((uint8_t *)&x, 32)); 740 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 741 x &= 0xff; /* base */ 742 /* 743 * Print bits and ranges. 744 * Locate first bit set (i), then locate first bit unset (j). 745 * If we have 3+ consecutive bits set, then print them as a 746 * range, otherwise only print the initial bit and rescan. 747 */ 748 for (i=0; i < cmd->o.arg1; i++) 749 if (map[i/32] & (1<<(i & 31))) { 750 for (j=i+1; j < cmd->o.arg1; j++) 751 if (!(map[ j/32] & (1<<(j & 31)))) 752 break; 753 printf("%c%d", comma, i+x); 754 if (j>i+2) { /* range has at least 3 elements */ 755 printf("-%d", j-1+x); 756 i = j-1; 757 } 758 comma = ','; 759 } 760 printf("}"); 761 return; 762 } 763 /* 764 * len == 2 indicates a single IP, whereas lists of 1 or more 765 * addr/mask pairs have len = (2n+1). We convert len to n so we 766 * use that to count the number of entries. 767 */ 768 for (len = len / 2; len > 0; len--, a += 2) { 769 int mb = /* mask length */ 770 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 771 32 : contigmask((uint8_t *)&(a[1]), 32); 772 if (mb == 32 && do_resolv) 773 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 774 if (he != NULL) /* resolved to name */ 775 printf("%s", he->h_name); 776 else if (mb == 0) /* any */ 777 printf("any"); 778 else { /* numeric IP followed by some kind of mask */ 779 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 780 if (mb < 0) 781 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 782 else if (mb < 32) 783 printf("/%d", mb); 784 } 785 if (len > 1) 786 printf(","); 787 } 788 } 789 790 /* 791 * prints a MAC address/mask pair 792 */ 793 static void 794 print_mac(uint8_t *addr, uint8_t *mask) 795 { 796 int l = contigmask(mask, 48); 797 798 if (l == 0) 799 printf(" any"); 800 else { 801 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 802 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 803 if (l == -1) 804 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 805 mask[0], mask[1], mask[2], 806 mask[3], mask[4], mask[5]); 807 else if (l < 48) 808 printf("/%d", l); 809 } 810 } 811 812 static void 813 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 814 { 815 uint8_t type; 816 817 cmd->d[0] = 0; 818 while (*av) { 819 if (*av == ',') 820 av++; 821 822 type = strtoul(av, &av, 0); 823 824 if (*av != ',' && *av != '\0') 825 errx(EX_DATAERR, "invalid ICMP type"); 826 827 if (type > 31) 828 errx(EX_DATAERR, "ICMP type out of range"); 829 830 cmd->d[0] |= 1 << type; 831 } 832 cmd->o.opcode = O_ICMPTYPE; 833 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 834 } 835 836 static void 837 print_icmptypes(ipfw_insn_u32 *cmd) 838 { 839 int i; 840 char sep= ' '; 841 842 printf(" icmptypes"); 843 for (i = 0; i < 32; i++) { 844 if ( (cmd->d[0] & (1 << (i))) == 0) 845 continue; 846 printf("%c%d", sep, i); 847 sep = ','; 848 } 849 } 850 851 /* 852 * show_ipfw() prints the body of an ipfw rule. 853 * Because the standard rule has at least proto src_ip dst_ip, we use 854 * a helper function to produce these entries if not provided explicitly. 855 * The first argument is the list of fields we have, the second is 856 * the list of fields we want to be printed. 857 * 858 * Special cases if we have provided a MAC header: 859 * + if the rule does not contain IP addresses/ports, do not print them; 860 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 861 * 862 * Once we have 'have_options', IP header fields are printed as options. 863 */ 864 #define HAVE_PROTO 0x0001 865 #define HAVE_SRCIP 0x0002 866 #define HAVE_DSTIP 0x0004 867 #define HAVE_MAC 0x0008 868 #define HAVE_MACTYPE 0x0010 869 #define HAVE_OPTIONS 0x8000 870 871 #define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 872 static void 873 show_prerequisites(int *flags, int want, int cmd) 874 { 875 if (comment_only) 876 return; 877 if ( (*flags & HAVE_IP) == HAVE_IP) 878 *flags |= HAVE_OPTIONS; 879 880 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 881 cmd != O_MAC_TYPE) { 882 /* 883 * mac-type was optimized out by the compiler, 884 * restore it 885 */ 886 printf(" any"); 887 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 888 return; 889 } 890 if ( !(*flags & HAVE_OPTIONS)) { 891 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 892 printf(" ip"); 893 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 894 printf(" from any"); 895 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 896 printf(" to any"); 897 } 898 *flags |= want; 899 } 900 901 static void 902 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 903 { 904 static int twidth = 0; 905 int l; 906 ipfw_insn *cmd; 907 char *comment = NULL; /* ptr to comment if we have one */ 908 int proto = 0; /* default */ 909 int flags = 0; /* prerequisites */ 910 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 911 int or_block = 0; /* we are in an or block */ 912 uint32_t set_disable; 913 914 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 915 916 if (set_disable & (1 << rule->set)) { /* disabled */ 917 if (!show_sets) 918 return; 919 else 920 printf("# DISABLED "); 921 } 922 printf("%05u ", rule->rulenum); 923 924 if (pcwidth>0 || bcwidth>0) 925 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 926 bcwidth, align_uint64(&rule->bcnt)); 927 928 if (do_time == 2) 929 printf("%10u ", rule->timestamp); 930 else if (do_time == 1) { 931 char timestr[30]; 932 time_t t = (time_t)0; 933 934 if (twidth == 0) { 935 strcpy(timestr, ctime(&t)); 936 *strchr(timestr, '\n') = '\0'; 937 twidth = strlen(timestr); 938 } 939 if (rule->timestamp) { 940 #if _FreeBSD_version < 500000 /* XXX check */ 941 #define _long_to_time(x) (time_t)(x) 942 #endif 943 t = _long_to_time(rule->timestamp); 944 945 strcpy(timestr, ctime(&t)); 946 *strchr(timestr, '\n') = '\0'; 947 printf("%s ", timestr); 948 } else { 949 printf("%*s", twidth, " "); 950 } 951 } 952 953 if (show_sets) 954 printf("set %d ", rule->set); 955 956 /* 957 * print the optional "match probability" 958 */ 959 if (rule->cmd_len > 0) { 960 cmd = rule->cmd ; 961 if (cmd->opcode == O_PROB) { 962 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 963 double d = 1.0 * p->d[0]; 964 965 d = (d / 0x7fffffff); 966 printf("prob %f ", d); 967 } 968 } 969 970 /* 971 * first print actions 972 */ 973 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 974 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 975 switch(cmd->opcode) { 976 case O_CHECK_STATE: 977 printf("check-state"); 978 flags = HAVE_IP; /* avoid printing anything else */ 979 break; 980 981 case O_ACCEPT: 982 printf("allow"); 983 break; 984 985 case O_COUNT: 986 printf("count"); 987 break; 988 989 case O_DENY: 990 printf("deny"); 991 break; 992 993 case O_REJECT: 994 if (cmd->arg1 == ICMP_REJECT_RST) 995 printf("reset"); 996 else if (cmd->arg1 == ICMP_UNREACH_HOST) 997 printf("reject"); 998 else 999 print_reject_code(cmd->arg1); 1000 break; 1001 1002 case O_SKIPTO: 1003 printf("skipto %u", cmd->arg1); 1004 break; 1005 1006 case O_PIPE: 1007 printf("pipe %u", cmd->arg1); 1008 break; 1009 1010 case O_QUEUE: 1011 printf("queue %u", cmd->arg1); 1012 break; 1013 1014 case O_DIVERT: 1015 printf("divert %u", cmd->arg1); 1016 break; 1017 1018 case O_TEE: 1019 printf("tee %u", cmd->arg1); 1020 break; 1021 1022 case O_FORWARD_IP: 1023 { 1024 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1025 1026 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1027 if (s->sa.sin_port) 1028 printf(",%d", s->sa.sin_port); 1029 } 1030 break; 1031 1032 case O_LOG: /* O_LOG is printed last */ 1033 logptr = (ipfw_insn_log *)cmd; 1034 break; 1035 1036 default: 1037 printf("** unrecognized action %d len %d", 1038 cmd->opcode, cmd->len); 1039 } 1040 } 1041 if (logptr) { 1042 if (logptr->max_log > 0) 1043 printf(" log logamount %d", logptr->max_log); 1044 else 1045 printf(" log"); 1046 } 1047 1048 /* 1049 * then print the body. 1050 */ 1051 if (rule->_pad & 1) { /* empty rules before options */ 1052 if (!do_compact) 1053 printf(" ip from any to any"); 1054 flags |= HAVE_IP | HAVE_OPTIONS; 1055 } 1056 1057 if (comment_only) 1058 comment = "..."; 1059 1060 for (l = rule->act_ofs, cmd = rule->cmd ; 1061 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1062 /* useful alias */ 1063 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1064 1065 if (comment_only) { 1066 if (cmd->opcode != O_NOP) 1067 continue; 1068 printf(" // %s\n", (char *)(cmd + 1)); 1069 return; 1070 } 1071 1072 show_prerequisites(&flags, 0, cmd->opcode); 1073 1074 switch(cmd->opcode) { 1075 case O_PROB: 1076 break; /* done already */ 1077 1078 case O_PROBE_STATE: 1079 break; /* no need to print anything here */ 1080 1081 case O_MACADDR2: { 1082 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1083 1084 if ((cmd->len & F_OR) && !or_block) 1085 printf(" {"); 1086 if (cmd->len & F_NOT) 1087 printf(" not"); 1088 printf(" MAC"); 1089 flags |= HAVE_MAC; 1090 print_mac(m->addr, m->mask); 1091 print_mac(m->addr + 6, m->mask + 6); 1092 } 1093 break; 1094 1095 case O_MAC_TYPE: 1096 if ((cmd->len & F_OR) && !or_block) 1097 printf(" {"); 1098 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 1099 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1100 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 1101 break; 1102 1103 case O_IP_SRC: 1104 case O_IP_SRC_LOOKUP: 1105 case O_IP_SRC_MASK: 1106 case O_IP_SRC_ME: 1107 case O_IP_SRC_SET: 1108 show_prerequisites(&flags, HAVE_PROTO, 0); 1109 if (!(flags & HAVE_SRCIP)) 1110 printf(" from"); 1111 if ((cmd->len & F_OR) && !or_block) 1112 printf(" {"); 1113 print_ip((ipfw_insn_ip *)cmd, 1114 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1115 flags |= HAVE_SRCIP; 1116 break; 1117 1118 case O_IP_DST: 1119 case O_IP_DST_LOOKUP: 1120 case O_IP_DST_MASK: 1121 case O_IP_DST_ME: 1122 case O_IP_DST_SET: 1123 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1124 if (!(flags & HAVE_DSTIP)) 1125 printf(" to"); 1126 if ((cmd->len & F_OR) && !or_block) 1127 printf(" {"); 1128 print_ip((ipfw_insn_ip *)cmd, 1129 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1130 flags |= HAVE_DSTIP; 1131 break; 1132 1133 case O_IP_DSTPORT: 1134 show_prerequisites(&flags, HAVE_IP, 0); 1135 case O_IP_SRCPORT: 1136 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1137 if ((cmd->len & F_OR) && !or_block) 1138 printf(" {"); 1139 print_newports((ipfw_insn_u16 *)cmd, proto, 1140 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1141 break; 1142 1143 case O_PROTO: { 1144 struct protoent *pe; 1145 1146 if ((cmd->len & F_OR) && !or_block) 1147 printf(" {"); 1148 if (cmd->len & F_NOT) 1149 printf(" not"); 1150 proto = cmd->arg1; 1151 pe = getprotobynumber(cmd->arg1); 1152 if (flags & HAVE_OPTIONS) 1153 printf(" proto"); 1154 if (pe) 1155 printf(" %s", pe->p_name); 1156 else 1157 printf(" %u", cmd->arg1); 1158 } 1159 flags |= HAVE_PROTO; 1160 break; 1161 1162 default: /*options ... */ 1163 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1164 if ((cmd->len & F_OR) && !or_block) 1165 printf(" {"); 1166 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1167 printf(" not"); 1168 switch(cmd->opcode) { 1169 case O_FRAG: 1170 printf(" frag"); 1171 break; 1172 1173 case O_IN: 1174 printf(cmd->len & F_NOT ? " out" : " in"); 1175 break; 1176 1177 case O_LAYER2: 1178 printf(" layer2"); 1179 break; 1180 case O_XMIT: 1181 case O_RECV: 1182 case O_VIA: { 1183 char const *s; 1184 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1185 1186 if (cmd->opcode == O_XMIT) 1187 s = "xmit"; 1188 else if (cmd->opcode == O_RECV) 1189 s = "recv"; 1190 else /* if (cmd->opcode == O_VIA) */ 1191 s = "via"; 1192 if (cmdif->name[0] == '\0') 1193 printf(" %s %s", s, 1194 inet_ntoa(cmdif->p.ip)); 1195 printf(" %s %s", s, cmdif->name); 1196 } 1197 break; 1198 1199 case O_IPID: 1200 if (F_LEN(cmd) == 1) 1201 printf(" ipid %u", cmd->arg1 ); 1202 else 1203 print_newports((ipfw_insn_u16 *)cmd, 0, 1204 O_IPID); 1205 break; 1206 1207 case O_IPTTL: 1208 if (F_LEN(cmd) == 1) 1209 printf(" ipttl %u", cmd->arg1 ); 1210 else 1211 print_newports((ipfw_insn_u16 *)cmd, 0, 1212 O_IPTTL); 1213 break; 1214 1215 case O_IPVER: 1216 printf(" ipver %u", cmd->arg1 ); 1217 break; 1218 1219 case O_IPPRECEDENCE: 1220 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1221 break; 1222 1223 case O_IPLEN: 1224 if (F_LEN(cmd) == 1) 1225 printf(" iplen %u", cmd->arg1 ); 1226 else 1227 print_newports((ipfw_insn_u16 *)cmd, 0, 1228 O_IPLEN); 1229 break; 1230 1231 case O_IPOPT: 1232 print_flags("ipoptions", cmd, f_ipopts); 1233 break; 1234 1235 case O_IPTOS: 1236 print_flags("iptos", cmd, f_iptos); 1237 break; 1238 1239 case O_ICMPTYPE: 1240 print_icmptypes((ipfw_insn_u32 *)cmd); 1241 break; 1242 1243 case O_ESTAB: 1244 printf(" established"); 1245 break; 1246 1247 case O_TCPFLAGS: 1248 print_flags("tcpflags", cmd, f_tcpflags); 1249 break; 1250 1251 case O_TCPOPTS: 1252 print_flags("tcpoptions", cmd, f_tcpopts); 1253 break; 1254 1255 case O_TCPWIN: 1256 printf(" tcpwin %d", ntohs(cmd->arg1)); 1257 break; 1258 1259 case O_TCPACK: 1260 printf(" tcpack %d", ntohl(cmd32->d[0])); 1261 break; 1262 1263 case O_TCPSEQ: 1264 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1265 break; 1266 1267 case O_UID: 1268 { 1269 struct passwd *pwd = getpwuid(cmd32->d[0]); 1270 1271 if (pwd) 1272 printf(" uid %s", pwd->pw_name); 1273 else 1274 printf(" uid %u", cmd32->d[0]); 1275 } 1276 break; 1277 1278 case O_GID: 1279 { 1280 struct group *grp = getgrgid(cmd32->d[0]); 1281 1282 if (grp) 1283 printf(" gid %s", grp->gr_name); 1284 else 1285 printf(" gid %u", cmd32->d[0]); 1286 } 1287 break; 1288 1289 case O_JAIL: 1290 printf(" jail %d", cmd32->d[0]); 1291 break; 1292 1293 case O_VERREVPATH: 1294 printf(" verrevpath"); 1295 break; 1296 1297 case O_VERSRCREACH: 1298 printf(" versrcreach"); 1299 break; 1300 1301 case O_ANTISPOOF: 1302 printf(" antispoof"); 1303 break; 1304 1305 case O_IPSEC: 1306 printf(" ipsec"); 1307 break; 1308 1309 case O_NOP: 1310 comment = (char *)(cmd + 1); 1311 break; 1312 1313 case O_KEEP_STATE: 1314 printf(" keep-state"); 1315 break; 1316 1317 case O_LIMIT: 1318 { 1319 struct _s_x *p = limit_masks; 1320 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1321 uint8_t x = c->limit_mask; 1322 char const *comma = " "; 1323 1324 printf(" limit"); 1325 for (; p->x != 0 ; p++) 1326 if ((x & p->x) == p->x) { 1327 x &= ~p->x; 1328 printf("%s%s", comma, p->s); 1329 comma = ","; 1330 } 1331 printf(" %d", c->conn_limit); 1332 } 1333 break; 1334 1335 default: 1336 printf(" [opcode %d len %d]", 1337 cmd->opcode, cmd->len); 1338 } 1339 } 1340 if (cmd->len & F_OR) { 1341 printf(" or"); 1342 or_block = 1; 1343 } else if (or_block) { 1344 printf(" }"); 1345 or_block = 0; 1346 } 1347 } 1348 show_prerequisites(&flags, HAVE_IP, 0); 1349 if (comment) 1350 printf(" // %s", comment); 1351 printf("\n"); 1352 } 1353 1354 static void 1355 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1356 { 1357 struct protoent *pe; 1358 struct in_addr a; 1359 uint16_t rulenum; 1360 1361 if (!do_expired) { 1362 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1363 return; 1364 } 1365 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1366 printf("%05d", rulenum); 1367 if (pcwidth>0 || bcwidth>0) 1368 printf(" %*llu %*llu (%ds)", pcwidth, 1369 align_uint64(&d->pcnt), bcwidth, 1370 align_uint64(&d->bcnt), d->expire); 1371 switch (d->dyn_type) { 1372 case O_LIMIT_PARENT: 1373 printf(" PARENT %d", d->count); 1374 break; 1375 case O_LIMIT: 1376 printf(" LIMIT"); 1377 break; 1378 case O_KEEP_STATE: /* bidir, no mask */ 1379 printf(" STATE"); 1380 break; 1381 } 1382 1383 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1384 printf(" %s", pe->p_name); 1385 else 1386 printf(" proto %u", d->id.proto); 1387 1388 a.s_addr = htonl(d->id.src_ip); 1389 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1390 1391 a.s_addr = htonl(d->id.dst_ip); 1392 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1393 printf("\n"); 1394 } 1395 1396 static int 1397 sort_q(const void *pa, const void *pb) 1398 { 1399 int rev = (do_sort < 0); 1400 int field = rev ? -do_sort : do_sort; 1401 long long res = 0; 1402 const struct dn_flow_queue *a = pa; 1403 const struct dn_flow_queue *b = pb; 1404 1405 switch (field) { 1406 case 1: /* pkts */ 1407 res = a->len - b->len; 1408 break; 1409 case 2: /* bytes */ 1410 res = a->len_bytes - b->len_bytes; 1411 break; 1412 1413 case 3: /* tot pkts */ 1414 res = a->tot_pkts - b->tot_pkts; 1415 break; 1416 1417 case 4: /* tot bytes */ 1418 res = a->tot_bytes - b->tot_bytes; 1419 break; 1420 } 1421 if (res < 0) 1422 res = -1; 1423 if (res > 0) 1424 res = 1; 1425 return (int)(rev ? res : -res); 1426 } 1427 1428 static void 1429 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1430 { 1431 int l; 1432 1433 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1434 fs->flow_mask.proto, 1435 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1436 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1437 if (fs->rq_elements == 0) 1438 return; 1439 1440 printf("BKT Prot ___Source IP/port____ " 1441 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1442 if (do_sort != 0) 1443 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1444 for (l = 0; l < fs->rq_elements; l++) { 1445 struct in_addr ina; 1446 struct protoent *pe; 1447 1448 ina.s_addr = htonl(q[l].id.src_ip); 1449 printf("%3d ", q[l].hash_slot); 1450 pe = getprotobynumber(q[l].id.proto); 1451 if (pe) 1452 printf("%-4s ", pe->p_name); 1453 else 1454 printf("%4u ", q[l].id.proto); 1455 printf("%15s/%-5d ", 1456 inet_ntoa(ina), q[l].id.src_port); 1457 ina.s_addr = htonl(q[l].id.dst_ip); 1458 printf("%15s/%-5d ", 1459 inet_ntoa(ina), q[l].id.dst_port); 1460 printf("%4qu %8qu %2u %4u %3u\n", 1461 q[l].tot_pkts, q[l].tot_bytes, 1462 q[l].len, q[l].len_bytes, q[l].drops); 1463 if (verbose) 1464 printf(" S %20qd F %20qd\n", 1465 q[l].S, q[l].F); 1466 } 1467 } 1468 1469 static void 1470 print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1471 { 1472 int l; 1473 char qs[30]; 1474 char plr[30]; 1475 char red[90]; /* Display RED parameters */ 1476 1477 l = fs->qsize; 1478 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1479 if (l >= 8192) 1480 sprintf(qs, "%d KB", l / 1024); 1481 else 1482 sprintf(qs, "%d B", l); 1483 } else 1484 sprintf(qs, "%3d sl.", l); 1485 if (fs->plr) 1486 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1487 else 1488 plr[0] = '\0'; 1489 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1490 sprintf(red, 1491 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1492 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1493 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1494 SCALE_VAL(fs->min_th), 1495 SCALE_VAL(fs->max_th), 1496 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1497 else 1498 sprintf(red, "droptail"); 1499 1500 printf("%s %s%s %d queues (%d buckets) %s\n", 1501 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1502 } 1503 1504 static void 1505 list_pipes(void *data, uint nbytes, int ac, char *av[]) 1506 { 1507 int rulenum; 1508 void *next = data; 1509 struct dn_pipe *p = (struct dn_pipe *) data; 1510 struct dn_flow_set *fs; 1511 struct dn_flow_queue *q; 1512 int l; 1513 1514 if (ac > 0) 1515 rulenum = strtoul(*av++, NULL, 10); 1516 else 1517 rulenum = 0; 1518 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1519 double b = p->bandwidth; 1520 char buf[30]; 1521 char prefix[80]; 1522 1523 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1524 break; /* done with pipes, now queues */ 1525 1526 /* 1527 * compute length, as pipe have variable size 1528 */ 1529 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1530 next = (char *)p + l; 1531 nbytes -= l; 1532 1533 if (rulenum != 0 && rulenum != p->pipe_nr) 1534 continue; 1535 1536 /* 1537 * Print rate (or clocking interface) 1538 */ 1539 if (p->if_name[0] != '\0') 1540 sprintf(buf, "%s", p->if_name); 1541 else if (b == 0) 1542 sprintf(buf, "unlimited"); 1543 else if (b >= 1000000) 1544 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1545 else if (b >= 1000) 1546 sprintf(buf, "%7.3f Kbit/s", b/1000); 1547 else 1548 sprintf(buf, "%7.3f bit/s ", b); 1549 1550 sprintf(prefix, "%05d: %s %4d ms ", 1551 p->pipe_nr, buf, p->delay); 1552 print_flowset_parms(&(p->fs), prefix); 1553 if (verbose) 1554 printf(" V %20qd\n", p->V >> MY_M); 1555 1556 q = (struct dn_flow_queue *)(p+1); 1557 list_queues(&(p->fs), q); 1558 } 1559 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1560 char prefix[80]; 1561 1562 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1563 break; 1564 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1565 next = (char *)fs + l; 1566 nbytes -= l; 1567 q = (struct dn_flow_queue *)(fs+1); 1568 sprintf(prefix, "q%05d: weight %d pipe %d ", 1569 fs->fs_nr, fs->weight, fs->parent_nr); 1570 print_flowset_parms(fs, prefix); 1571 list_queues(fs, q); 1572 } 1573 } 1574 1575 /* 1576 * This one handles all set-related commands 1577 * ipfw set { show | enable | disable } 1578 * ipfw set swap X Y 1579 * ipfw set move X to Y 1580 * ipfw set move rule X to Y 1581 */ 1582 static void 1583 sets_handler(int ac, char *av[]) 1584 { 1585 uint32_t set_disable, masks[2]; 1586 int i, nbytes; 1587 uint16_t rulenum; 1588 uint8_t cmd, new_set; 1589 1590 ac--; 1591 av++; 1592 1593 if (!ac) 1594 errx(EX_USAGE, "set needs command"); 1595 if (!strncmp(*av, "show", strlen(*av)) ) { 1596 void *data; 1597 char const *msg; 1598 1599 nbytes = sizeof(struct ip_fw); 1600 if ((data = calloc(1, nbytes)) == NULL) 1601 err(EX_OSERR, "calloc"); 1602 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1603 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1604 bcopy(&((struct ip_fw *)data)->next_rule, 1605 &set_disable, sizeof(set_disable)); 1606 1607 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1608 if ((set_disable & (1<<i))) { 1609 printf("%s %d", msg, i); 1610 msg = ""; 1611 } 1612 msg = (set_disable) ? " enable" : "enable"; 1613 for (i = 0; i < RESVD_SET; i++) 1614 if (!(set_disable & (1<<i))) { 1615 printf("%s %d", msg, i); 1616 msg = ""; 1617 } 1618 printf("\n"); 1619 } else if (!strncmp(*av, "swap", strlen(*av))) { 1620 ac--; av++; 1621 if (ac != 2) 1622 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1623 rulenum = atoi(av[0]); 1624 new_set = atoi(av[1]); 1625 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1626 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1627 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1628 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1629 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1630 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1631 } else if (!strncmp(*av, "move", strlen(*av))) { 1632 ac--; av++; 1633 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1634 cmd = 2; 1635 ac--; av++; 1636 } else 1637 cmd = 3; 1638 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1639 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1640 rulenum = atoi(av[0]); 1641 new_set = atoi(av[2]); 1642 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1643 (cmd == 2 && rulenum == 65535) ) 1644 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1645 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1646 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1647 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1648 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1649 } else if (!strncmp(*av, "disable", strlen(*av)) || 1650 !strncmp(*av, "enable", strlen(*av)) ) { 1651 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1652 1653 ac--; av++; 1654 masks[0] = masks[1] = 0; 1655 1656 while (ac) { 1657 if (isdigit(**av)) { 1658 i = atoi(*av); 1659 if (i < 0 || i > RESVD_SET) 1660 errx(EX_DATAERR, 1661 "invalid set number %d\n", i); 1662 masks[which] |= (1<<i); 1663 } else if (!strncmp(*av, "disable", strlen(*av))) 1664 which = 0; 1665 else if (!strncmp(*av, "enable", strlen(*av))) 1666 which = 1; 1667 else 1668 errx(EX_DATAERR, 1669 "invalid set command %s\n", *av); 1670 av++; ac--; 1671 } 1672 if ( (masks[0] & masks[1]) != 0 ) 1673 errx(EX_DATAERR, 1674 "cannot enable and disable the same set\n"); 1675 1676 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1677 if (i) 1678 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1679 } else 1680 errx(EX_USAGE, "invalid set command %s\n", *av); 1681 } 1682 1683 static void 1684 sysctl_handler(int ac, char *av[], int which) 1685 { 1686 ac--; 1687 av++; 1688 1689 if (ac == 0) { 1690 warnx("missing keyword to enable/disable\n"); 1691 } else if (strncmp(*av, "firewall", strlen(*av)) == 0) { 1692 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1693 &which, sizeof(which)); 1694 } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) { 1695 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1696 &which, sizeof(which)); 1697 } else if (strncmp(*av, "debug", strlen(*av)) == 0) { 1698 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1699 &which, sizeof(which)); 1700 } else if (strncmp(*av, "verbose", strlen(*av)) == 0) { 1701 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1702 &which, sizeof(which)); 1703 } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) { 1704 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1705 &which, sizeof(which)); 1706 } else { 1707 warnx("unrecognize enable/disable keyword: %s\n", *av); 1708 } 1709 } 1710 1711 static void 1712 list(int ac, char *av[], int show_counters) 1713 { 1714 struct ip_fw *r; 1715 ipfw_dyn_rule *dynrules, *d; 1716 1717 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1718 char *lim; 1719 void *data = NULL; 1720 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1721 int exitval = EX_OK; 1722 int lac; 1723 char **lav; 1724 u_long rnum, last; 1725 char *endptr; 1726 int seen = 0; 1727 1728 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1729 int nalloc = 1024; /* start somewhere... */ 1730 1731 if (test_only) { 1732 fprintf(stderr, "Testing only, list disabled\n"); 1733 return; 1734 } 1735 1736 ac--; 1737 av++; 1738 1739 /* get rules or pipes from kernel, resizing array as necessary */ 1740 nbytes = nalloc; 1741 1742 while (nbytes >= nalloc) { 1743 nalloc = nalloc * 2 + 200; 1744 nbytes = nalloc; 1745 if ((data = realloc(data, nbytes)) == NULL) 1746 err(EX_OSERR, "realloc"); 1747 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1748 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1749 do_pipe ? "DUMMYNET" : "FW"); 1750 } 1751 1752 if (do_pipe) { 1753 list_pipes(data, nbytes, ac, av); 1754 goto done; 1755 } 1756 1757 /* 1758 * Count static rules. They have variable size so we 1759 * need to scan the list to count them. 1760 */ 1761 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1762 r->rulenum < 65535 && (char *)r < lim; 1763 ++nstat, r = NEXT(r) ) 1764 ; /* nothing */ 1765 1766 /* 1767 * Count dynamic rules. This is easier as they have 1768 * fixed size. 1769 */ 1770 r = NEXT(r); 1771 dynrules = (ipfw_dyn_rule *)r ; 1772 n = (char *)r - (char *)data; 1773 ndyn = (nbytes - n) / sizeof *dynrules; 1774 1775 /* if showing stats, figure out column widths ahead of time */ 1776 bcwidth = pcwidth = 0; 1777 if (show_counters) { 1778 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1779 /* packet counter */ 1780 width = snprintf(NULL, 0, "%llu", 1781 align_uint64(&r->pcnt)); 1782 if (width > pcwidth) 1783 pcwidth = width; 1784 1785 /* byte counter */ 1786 width = snprintf(NULL, 0, "%llu", 1787 align_uint64(&r->bcnt)); 1788 if (width > bcwidth) 1789 bcwidth = width; 1790 } 1791 } 1792 if (do_dynamic && ndyn) { 1793 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1794 width = snprintf(NULL, 0, "%llu", 1795 align_uint64(&d->pcnt)); 1796 if (width > pcwidth) 1797 pcwidth = width; 1798 1799 width = snprintf(NULL, 0, "%llu", 1800 align_uint64(&d->bcnt)); 1801 if (width > bcwidth) 1802 bcwidth = width; 1803 } 1804 } 1805 /* if no rule numbers were specified, list all rules */ 1806 if (ac == 0) { 1807 for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) 1808 show_ipfw(r, pcwidth, bcwidth); 1809 1810 if (do_dynamic && ndyn) { 1811 printf("## Dynamic rules (%d):\n", ndyn); 1812 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1813 show_dyn_ipfw(d, pcwidth, bcwidth); 1814 } 1815 goto done; 1816 } 1817 1818 /* display specific rules requested on command line */ 1819 1820 for (lac = ac, lav = av; lac != 0; lac--) { 1821 /* convert command line rule # */ 1822 last = rnum = strtoul(*lav++, &endptr, 10); 1823 if (*endptr == '-') 1824 last = strtoul(endptr+1, &endptr, 10); 1825 if (*endptr) { 1826 exitval = EX_USAGE; 1827 warnx("invalid rule number: %s", *(lav - 1)); 1828 continue; 1829 } 1830 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1831 if (r->rulenum > last) 1832 break; 1833 if (r->rulenum >= rnum && r->rulenum <= last) { 1834 show_ipfw(r, pcwidth, bcwidth); 1835 seen = 1; 1836 } 1837 } 1838 if (!seen) { 1839 /* give precedence to other error(s) */ 1840 if (exitval == EX_OK) 1841 exitval = EX_UNAVAILABLE; 1842 warnx("rule %lu does not exist", rnum); 1843 } 1844 } 1845 1846 if (do_dynamic && ndyn) { 1847 printf("## Dynamic rules:\n"); 1848 for (lac = ac, lav = av; lac != 0; lac--) { 1849 rnum = strtoul(*lav++, &endptr, 10); 1850 if (*endptr == '-') 1851 last = strtoul(endptr+1, &endptr, 10); 1852 if (*endptr) 1853 /* already warned */ 1854 continue; 1855 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1856 uint16_t rulenum; 1857 1858 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1859 if (rulenum > rnum) 1860 break; 1861 if (r->rulenum >= rnum && r->rulenum <= last) 1862 show_dyn_ipfw(d, pcwidth, bcwidth); 1863 } 1864 } 1865 } 1866 1867 ac = 0; 1868 1869 done: 1870 free(data); 1871 1872 if (exitval != EX_OK) 1873 exit(exitval); 1874 #undef NEXT 1875 } 1876 1877 static void 1878 show_usage(void) 1879 { 1880 fprintf(stderr, "usage: ipfw [options]\n" 1881 "do \"ipfw -h\" or see ipfw manpage for details\n" 1882 ); 1883 exit(EX_USAGE); 1884 } 1885 1886 static void 1887 help(void) 1888 { 1889 fprintf(stderr, 1890 "ipfw syntax summary (but please do read the ipfw(8) manpage):\n" 1891 "ipfw [-abcdefhnNqStTv] <command> where <command> is one of:\n" 1892 "add [num] [set N] [prob x] RULE-BODY\n" 1893 "{pipe|queue} N config PIPE-BODY\n" 1894 "[pipe|queue] {zero|delete|show} [N{,N}]\n" 1895 "set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 1896 "table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n" 1897 "\n" 1898 "RULE-BODY: check-state [LOG] | ACTION [LOG] ADDR [OPTION_LIST]\n" 1899 "ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1900 " {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1901 "ADDR: [ MAC dst src ether_type ] \n" 1902 " [ from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 1903 "IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n" 1904 "IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 1905 "OPTION_LIST: OPTION [OPTION_LIST]\n" 1906 "OPTION: bridged | {dst-ip|src-ip} ADDR | {dst-port|src-port} LIST |\n" 1907 " estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 1908 " iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 1909 " ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 1910 " mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 1911 " setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 1912 " verrevpath | versrcreach | antispoof\n" 1913 ); 1914 exit(0); 1915 } 1916 1917 1918 static int 1919 lookup_host (char *host, struct in_addr *ipaddr) 1920 { 1921 struct hostent *he; 1922 1923 if (!inet_aton(host, ipaddr)) { 1924 if ((he = gethostbyname(host)) == NULL) 1925 return(-1); 1926 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1927 } 1928 return(0); 1929 } 1930 1931 /* 1932 * fills the addr and mask fields in the instruction as appropriate from av. 1933 * Update length as appropriate. 1934 * The following formats are allowed: 1935 * any matches any IP. Actually returns an empty instruction. 1936 * me returns O_IP_*_ME 1937 * 1.2.3.4 single IP address 1938 * 1.2.3.4:5.6.7.8 address:mask 1939 * 1.2.3.4/24 address/mask 1940 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1941 * We can have multiple comma-separated address/mask entries. 1942 */ 1943 static void 1944 fill_ip(ipfw_insn_ip *cmd, char *av) 1945 { 1946 int len = 0; 1947 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1948 1949 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1950 1951 if (!strncmp(av, "any", strlen(av))) 1952 return; 1953 1954 if (!strncmp(av, "me", strlen(av))) { 1955 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1956 return; 1957 } 1958 1959 if (!strncmp(av, "table(", 6)) { 1960 char *p = strchr(av + 6, ','); 1961 1962 if (p) 1963 *p++ = '\0'; 1964 cmd->o.opcode = O_IP_DST_LOOKUP; 1965 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 1966 if (p) { 1967 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1968 d[0] = strtoul(p, NULL, 0); 1969 } else 1970 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1971 return; 1972 } 1973 1974 while (av) { 1975 /* 1976 * After the address we can have '/' or ':' indicating a mask, 1977 * ',' indicating another address follows, '{' indicating a 1978 * set of addresses of unspecified size. 1979 */ 1980 char *p = strpbrk(av, "/:,{"); 1981 int masklen; 1982 char md; 1983 1984 if (p) { 1985 md = *p; 1986 *p++ = '\0'; 1987 } else 1988 md = '\0'; 1989 1990 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1991 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1992 switch (md) { 1993 case ':': 1994 if (!inet_aton(p, (struct in_addr *)&d[1])) 1995 errx(EX_DATAERR, "bad netmask ``%s''", p); 1996 break; 1997 case '/': 1998 masklen = atoi(p); 1999 if (masklen == 0) 2000 d[1] = htonl(0); /* mask */ 2001 else if (masklen > 32) 2002 errx(EX_DATAERR, "bad width ``%s''", p); 2003 else 2004 d[1] = htonl(~0 << (32 - masklen)); 2005 break; 2006 case '{': /* no mask, assume /24 and put back the '{' */ 2007 d[1] = htonl(~0 << (32 - 24)); 2008 *(--p) = md; 2009 break; 2010 2011 case ',': /* single address plus continuation */ 2012 *(--p) = md; 2013 /* FALLTHROUGH */ 2014 case 0: /* initialization value */ 2015 default: 2016 d[1] = htonl(~0); /* force /32 */ 2017 break; 2018 } 2019 d[0] &= d[1]; /* mask base address with mask */ 2020 /* find next separator */ 2021 if (p) 2022 p = strpbrk(p, ",{"); 2023 if (p && *p == '{') { 2024 /* 2025 * We have a set of addresses. They are stored as follows: 2026 * arg1 is the set size (powers of 2, 2..256) 2027 * addr is the base address IN HOST FORMAT 2028 * mask.. is an array of arg1 bits (rounded up to 2029 * the next multiple of 32) with bits set 2030 * for each host in the map. 2031 */ 2032 uint32_t *map = (uint32_t *)&cmd->mask; 2033 int low, high; 2034 int i = contigmask((uint8_t *)&(d[1]), 32); 2035 2036 if (len > 0) 2037 errx(EX_DATAERR, "address set cannot be in a list"); 2038 if (i < 24 || i > 31) 2039 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2040 cmd->o.arg1 = 1<<(32-i); /* map length */ 2041 d[0] = ntohl(d[0]); /* base addr in host format */ 2042 cmd->o.opcode = O_IP_DST_SET; /* default */ 2043 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2044 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2045 map[i] = 0; /* clear map */ 2046 2047 av = p + 1; 2048 low = d[0] & 0xff; 2049 high = low + cmd->o.arg1 - 1; 2050 /* 2051 * Here, i stores the previous value when we specify a range 2052 * of addresses within a mask, e.g. 45-63. i = -1 means we 2053 * have no previous value. 2054 */ 2055 i = -1; /* previous value in a range */ 2056 while (isdigit(*av)) { 2057 char *s; 2058 int a = strtol(av, &s, 0); 2059 2060 if (s == av) { /* no parameter */ 2061 if (*av != '}') 2062 errx(EX_DATAERR, "set not closed\n"); 2063 if (i != -1) 2064 errx(EX_DATAERR, "incomplete range %d-", i); 2065 break; 2066 } 2067 if (a < low || a > high) 2068 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2069 a, low, high); 2070 a -= low; 2071 if (i == -1) /* no previous in range */ 2072 i = a; 2073 else { /* check that range is valid */ 2074 if (i > a) 2075 errx(EX_DATAERR, "invalid range %d-%d", 2076 i+low, a+low); 2077 if (*s == '-') 2078 errx(EX_DATAERR, "double '-' in range"); 2079 } 2080 for (; i <= a; i++) 2081 map[i/32] |= 1<<(i & 31); 2082 i = -1; 2083 if (*s == '-') 2084 i = a; 2085 else if (*s == '}') 2086 break; 2087 av = s+1; 2088 } 2089 return; 2090 } 2091 av = p; 2092 if (av) /* then *av must be a ',' */ 2093 av++; 2094 2095 /* Check this entry */ 2096 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2097 /* 2098 * 'any' turns the entire list into a NOP. 2099 * 'not any' never matches, so it is removed from the 2100 * list unless it is the only item, in which case we 2101 * report an error. 2102 */ 2103 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2104 if (av == NULL && len == 0) /* only this entry */ 2105 errx(EX_DATAERR, "not any never matches"); 2106 } 2107 /* else do nothing and skip this entry */ 2108 return; 2109 } 2110 /* A single IP can be stored in an optimized format */ 2111 if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { 2112 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2113 return; 2114 } 2115 len += 2; /* two words... */ 2116 d += 2; 2117 } /* end while */ 2118 cmd->o.len |= len+1; 2119 } 2120 2121 2122 /* 2123 * helper function to process a set of flags and set bits in the 2124 * appropriate masks. 2125 */ 2126 static void 2127 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2128 struct _s_x *flags, char *p) 2129 { 2130 uint8_t set=0, clear=0; 2131 2132 while (p && *p) { 2133 char *q; /* points to the separator */ 2134 int val; 2135 uint8_t *which; /* mask we are working on */ 2136 2137 if (*p == '!') { 2138 p++; 2139 which = &clear; 2140 } else 2141 which = &set; 2142 q = strchr(p, ','); 2143 if (q) 2144 *q++ = '\0'; 2145 val = match_token(flags, p); 2146 if (val <= 0) 2147 errx(EX_DATAERR, "invalid flag %s", p); 2148 *which |= (uint8_t)val; 2149 p = q; 2150 } 2151 cmd->opcode = opcode; 2152 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2153 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2154 } 2155 2156 2157 static void 2158 delete(int ac, char *av[]) 2159 { 2160 uint32_t rulenum; 2161 struct dn_pipe p; 2162 int i; 2163 int exitval = EX_OK; 2164 int do_set = 0; 2165 2166 memset(&p, 0, sizeof p); 2167 2168 av++; ac--; 2169 NEED1("missing rule specification"); 2170 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 2171 do_set = 1; /* delete set */ 2172 ac--; av++; 2173 } 2174 2175 /* Rule number */ 2176 while (ac && isdigit(**av)) { 2177 i = atoi(*av); av++; ac--; 2178 if (do_pipe) { 2179 if (do_pipe == 1) 2180 p.pipe_nr = i; 2181 else 2182 p.fs.fs_nr = i; 2183 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 2184 if (i) { 2185 exitval = 1; 2186 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 2187 do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); 2188 } 2189 } else { 2190 rulenum = (i & 0xffff) | (do_set << 24); 2191 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2192 if (i) { 2193 exitval = EX_UNAVAILABLE; 2194 warn("rule %u: setsockopt(IP_FW_DEL)", 2195 rulenum); 2196 } 2197 } 2198 } 2199 if (exitval != EX_OK) 2200 exit(exitval); 2201 } 2202 2203 2204 /* 2205 * fill the interface structure. We do not check the name as we can 2206 * create interfaces dynamically, so checking them at insert time 2207 * makes relatively little sense. 2208 * Interface names containing '*', '?', or '[' are assumed to be shell 2209 * patterns which match interfaces. 2210 */ 2211 static void 2212 fill_iface(ipfw_insn_if *cmd, char *arg) 2213 { 2214 cmd->name[0] = '\0'; 2215 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2216 2217 /* Parse the interface or address */ 2218 if (!strcmp(arg, "any")) 2219 cmd->o.len = 0; /* effectively ignore this command */ 2220 else if (!isdigit(*arg)) { 2221 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2222 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2223 } else if (!inet_aton(arg, &cmd->p.ip)) 2224 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2225 } 2226 2227 static void 2228 config_pipe(int ac, char **av) 2229 { 2230 struct dn_pipe p; 2231 int i; 2232 char *end; 2233 uint32_t a; 2234 void *par = NULL; 2235 2236 memset(&p, 0, sizeof p); 2237 2238 av++; ac--; 2239 /* Pipe number */ 2240 if (ac && isdigit(**av)) { 2241 i = atoi(*av); av++; ac--; 2242 if (do_pipe == 1) 2243 p.pipe_nr = i; 2244 else 2245 p.fs.fs_nr = i; 2246 } 2247 while (ac > 0) { 2248 double d; 2249 int tok = match_token(dummynet_params, *av); 2250 ac--; av++; 2251 2252 switch(tok) { 2253 case TOK_NOERROR: 2254 p.fs.flags_fs |= DN_NOERROR; 2255 break; 2256 2257 case TOK_PLR: 2258 NEED1("plr needs argument 0..1\n"); 2259 d = strtod(av[0], NULL); 2260 if (d > 1) 2261 d = 1; 2262 else if (d < 0) 2263 d = 0; 2264 p.fs.plr = (int)(d*0x7fffffff); 2265 ac--; av++; 2266 break; 2267 2268 case TOK_QUEUE: 2269 NEED1("queue needs queue size\n"); 2270 end = NULL; 2271 p.fs.qsize = strtoul(av[0], &end, 0); 2272 if (*end == 'K' || *end == 'k') { 2273 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2274 p.fs.qsize *= 1024; 2275 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 2276 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2277 } 2278 ac--; av++; 2279 break; 2280 2281 case TOK_BUCKETS: 2282 NEED1("buckets needs argument\n"); 2283 p.fs.rq_size = strtoul(av[0], NULL, 0); 2284 ac--; av++; 2285 break; 2286 2287 case TOK_MASK: 2288 NEED1("mask needs mask specifier\n"); 2289 /* 2290 * per-flow queue, mask is dst_ip, dst_port, 2291 * src_ip, src_port, proto measured in bits 2292 */ 2293 par = NULL; 2294 2295 p.fs.flow_mask.dst_ip = 0; 2296 p.fs.flow_mask.src_ip = 0; 2297 p.fs.flow_mask.dst_port = 0; 2298 p.fs.flow_mask.src_port = 0; 2299 p.fs.flow_mask.proto = 0; 2300 end = NULL; 2301 2302 while (ac >= 1) { 2303 uint32_t *p32 = NULL; 2304 uint16_t *p16 = NULL; 2305 2306 tok = match_token(dummynet_params, *av); 2307 ac--; av++; 2308 switch(tok) { 2309 case TOK_ALL: 2310 /* 2311 * special case, all bits significant 2312 */ 2313 p.fs.flow_mask.dst_ip = ~0; 2314 p.fs.flow_mask.src_ip = ~0; 2315 p.fs.flow_mask.dst_port = ~0; 2316 p.fs.flow_mask.src_port = ~0; 2317 p.fs.flow_mask.proto = ~0; 2318 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2319 goto end_mask; 2320 2321 case TOK_DSTIP: 2322 p32 = &p.fs.flow_mask.dst_ip; 2323 break; 2324 2325 case TOK_SRCIP: 2326 p32 = &p.fs.flow_mask.src_ip; 2327 break; 2328 2329 case TOK_DSTPORT: 2330 p16 = &p.fs.flow_mask.dst_port; 2331 break; 2332 2333 case TOK_SRCPORT: 2334 p16 = &p.fs.flow_mask.src_port; 2335 break; 2336 2337 case TOK_PROTO: 2338 break; 2339 2340 default: 2341 ac++; av--; /* backtrack */ 2342 goto end_mask; 2343 } 2344 if (ac < 1) 2345 errx(EX_USAGE, "mask: value missing"); 2346 if (*av[0] == '/') { 2347 a = strtoul(av[0]+1, &end, 0); 2348 a = (a == 32) ? ~0 : (1 << a) - 1; 2349 } else 2350 a = strtoul(av[0], &end, 0); 2351 if (p32 != NULL) 2352 *p32 = a; 2353 else if (p16 != NULL) { 2354 if (a > 65535) 2355 errx(EX_DATAERR, 2356 "mask: must be 16 bit"); 2357 *p16 = (uint16_t)a; 2358 } else { 2359 if (a > 255) 2360 errx(EX_DATAERR, 2361 "mask: must be 8 bit"); 2362 p.fs.flow_mask.proto = (uint8_t)a; 2363 } 2364 if (a != 0) 2365 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2366 ac--; av++; 2367 } /* end while, config masks */ 2368 end_mask: 2369 break; 2370 2371 case TOK_RED: 2372 case TOK_GRED: 2373 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2374 p.fs.flags_fs |= DN_IS_RED; 2375 if (tok == TOK_GRED) 2376 p.fs.flags_fs |= DN_IS_GENTLE_RED; 2377 /* 2378 * the format for parameters is w_q/min_th/max_th/max_p 2379 */ 2380 if ((end = strsep(&av[0], "/"))) { 2381 double w_q = strtod(end, NULL); 2382 if (w_q > 1 || w_q <= 0) 2383 errx(EX_DATAERR, "0 < w_q <= 1"); 2384 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2385 } 2386 if ((end = strsep(&av[0], "/"))) { 2387 p.fs.min_th = strtoul(end, &end, 0); 2388 if (*end == 'K' || *end == 'k') 2389 p.fs.min_th *= 1024; 2390 } 2391 if ((end = strsep(&av[0], "/"))) { 2392 p.fs.max_th = strtoul(end, &end, 0); 2393 if (*end == 'K' || *end == 'k') 2394 p.fs.max_th *= 1024; 2395 } 2396 if ((end = strsep(&av[0], "/"))) { 2397 double max_p = strtod(end, NULL); 2398 if (max_p > 1 || max_p <= 0) 2399 errx(EX_DATAERR, "0 < max_p <= 1"); 2400 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2401 } 2402 ac--; av++; 2403 break; 2404 2405 case TOK_DROPTAIL: 2406 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2407 break; 2408 2409 case TOK_BW: 2410 NEED1("bw needs bandwidth or interface\n"); 2411 if (do_pipe != 1) 2412 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2413 /* 2414 * set clocking interface or bandwidth value 2415 */ 2416 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2417 int l = sizeof(p.if_name)-1; 2418 /* interface name */ 2419 strncpy(p.if_name, av[0], l); 2420 p.if_name[l] = '\0'; 2421 p.bandwidth = 0; 2422 } else { 2423 p.if_name[0] = '\0'; 2424 p.bandwidth = strtoul(av[0], &end, 0); 2425 if (*end == 'K' || *end == 'k') { 2426 end++; 2427 p.bandwidth *= 1000; 2428 } else if (*end == 'M') { 2429 end++; 2430 p.bandwidth *= 1000000; 2431 } 2432 if (*end == 'B' || !strncmp(end, "by", 2)) 2433 p.bandwidth *= 8; 2434 if (p.bandwidth < 0) 2435 errx(EX_DATAERR, "bandwidth too large"); 2436 } 2437 ac--; av++; 2438 break; 2439 2440 case TOK_DELAY: 2441 if (do_pipe != 1) 2442 errx(EX_DATAERR, "delay only valid for pipes"); 2443 NEED1("delay needs argument 0..10000ms\n"); 2444 p.delay = strtoul(av[0], NULL, 0); 2445 ac--; av++; 2446 break; 2447 2448 case TOK_WEIGHT: 2449 if (do_pipe == 1) 2450 errx(EX_DATAERR,"weight only valid for queues"); 2451 NEED1("weight needs argument 0..100\n"); 2452 p.fs.weight = strtoul(av[0], &end, 0); 2453 ac--; av++; 2454 break; 2455 2456 case TOK_PIPE: 2457 if (do_pipe == 1) 2458 errx(EX_DATAERR,"pipe only valid for queues"); 2459 NEED1("pipe needs pipe_number\n"); 2460 p.fs.parent_nr = strtoul(av[0], &end, 0); 2461 ac--; av++; 2462 break; 2463 2464 default: 2465 errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); 2466 } 2467 } 2468 if (do_pipe == 1) { 2469 if (p.pipe_nr == 0) 2470 errx(EX_DATAERR, "pipe_nr must be > 0"); 2471 if (p.delay > 10000) 2472 errx(EX_DATAERR, "delay must be < 10000"); 2473 } else { /* do_pipe == 2, queue */ 2474 if (p.fs.parent_nr == 0) 2475 errx(EX_DATAERR, "pipe must be > 0"); 2476 if (p.fs.weight >100) 2477 errx(EX_DATAERR, "weight must be <= 100"); 2478 } 2479 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2480 if (p.fs.qsize > 1024*1024) 2481 errx(EX_DATAERR, "queue size must be < 1MB"); 2482 } else { 2483 if (p.fs.qsize > 100) 2484 errx(EX_DATAERR, "2 <= queue size <= 100"); 2485 } 2486 if (p.fs.flags_fs & DN_IS_RED) { 2487 size_t len; 2488 int lookup_depth, avg_pkt_size; 2489 double s, idle, weight, w_q; 2490 struct clockinfo ck; 2491 int t; 2492 2493 if (p.fs.min_th >= p.fs.max_th) 2494 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2495 p.fs.min_th, p.fs.max_th); 2496 if (p.fs.max_th == 0) 2497 errx(EX_DATAERR, "max_th must be > 0"); 2498 2499 len = sizeof(int); 2500 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2501 &lookup_depth, &len, NULL, 0) == -1) 2502 2503 errx(1, "sysctlbyname(\"%s\")", 2504 "net.inet.ip.dummynet.red_lookup_depth"); 2505 if (lookup_depth == 0) 2506 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2507 " must be greater than zero"); 2508 2509 len = sizeof(int); 2510 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2511 &avg_pkt_size, &len, NULL, 0) == -1) 2512 2513 errx(1, "sysctlbyname(\"%s\")", 2514 "net.inet.ip.dummynet.red_avg_pkt_size"); 2515 if (avg_pkt_size == 0) 2516 errx(EX_DATAERR, 2517 "net.inet.ip.dummynet.red_avg_pkt_size must" 2518 " be greater than zero"); 2519 2520 len = sizeof(struct clockinfo); 2521 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 2522 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2523 2524 /* 2525 * Ticks needed for sending a medium-sized packet. 2526 * Unfortunately, when we are configuring a WF2Q+ queue, we 2527 * do not have bandwidth information, because that is stored 2528 * in the parent pipe, and also we have multiple queues 2529 * competing for it. So we set s=0, which is not very 2530 * correct. But on the other hand, why do we want RED with 2531 * WF2Q+ ? 2532 */ 2533 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 2534 s = 0; 2535 else 2536 s = ck.hz * avg_pkt_size * 8 / p.bandwidth; 2537 2538 /* 2539 * max idle time (in ticks) before avg queue size becomes 0. 2540 * NOTA: (3/w_q) is approx the value x so that 2541 * (1-w_q)^x < 10^-3. 2542 */ 2543 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 2544 idle = s * 3. / w_q; 2545 p.fs.lookup_step = (int)idle / lookup_depth; 2546 if (!p.fs.lookup_step) 2547 p.fs.lookup_step = 1; 2548 weight = 1 - w_q; 2549 for (t = p.fs.lookup_step; t > 0; --t) 2550 weight *= weight; 2551 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2552 } 2553 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 2554 if (i) 2555 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2556 } 2557 2558 static void 2559 get_mac_addr_mask(char *p, uint8_t *addr, uint8_t *mask) 2560 { 2561 int i, l; 2562 2563 for (i=0; i<6; i++) 2564 addr[i] = mask[i] = 0; 2565 if (!strcmp(p, "any")) 2566 return; 2567 2568 for (i=0; *p && i<6;i++, p++) { 2569 addr[i] = strtol(p, &p, 16); 2570 if (*p != ':') /* we start with the mask */ 2571 break; 2572 } 2573 if (*p == '/') { /* mask len */ 2574 l = strtol(p+1, &p, 0); 2575 for (i=0; l>0; l -=8, i++) 2576 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2577 } else if (*p == '&') { /* mask */ 2578 for (i=0, p++; *p && i<6;i++, p++) { 2579 mask[i] = strtol(p, &p, 16); 2580 if (*p != ':') 2581 break; 2582 } 2583 } else if (*p == '\0') { 2584 for (i=0; i<6; i++) 2585 mask[i] = 0xff; 2586 } 2587 for (i=0; i<6; i++) 2588 addr[i] &= mask[i]; 2589 } 2590 2591 /* 2592 * helper function, updates the pointer to cmd with the length 2593 * of the current command, and also cleans up the first word of 2594 * the new command in case it has been clobbered before. 2595 */ 2596 static ipfw_insn * 2597 next_cmd(ipfw_insn *cmd) 2598 { 2599 cmd += F_LEN(cmd); 2600 bzero(cmd, sizeof(*cmd)); 2601 return cmd; 2602 } 2603 2604 /* 2605 * Takes arguments and copies them into a comment 2606 */ 2607 static void 2608 fill_comment(ipfw_insn *cmd, int ac, char **av) 2609 { 2610 int i, l; 2611 char *p = (char *)(cmd + 1); 2612 2613 cmd->opcode = O_NOP; 2614 cmd->len = (cmd->len & (F_NOT | F_OR)); 2615 2616 /* Compute length of comment string. */ 2617 for (i = 0, l = 0; i < ac; i++) 2618 l += strlen(av[i]) + 1; 2619 if (l == 0) 2620 return; 2621 if (l > 84) 2622 errx(EX_DATAERR, 2623 "comment too long (max 80 chars)"); 2624 l = 1 + (l+3)/4; 2625 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2626 for (i = 0; i < ac; i++) { 2627 strcpy(p, av[i]); 2628 p += strlen(av[i]); 2629 *p++ = ' '; 2630 } 2631 *(--p) = '\0'; 2632 } 2633 2634 /* 2635 * A function to fill simple commands of size 1. 2636 * Existing flags are preserved. 2637 */ 2638 static void 2639 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2640 { 2641 cmd->opcode = opcode; 2642 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2643 cmd->arg1 = arg; 2644 } 2645 2646 /* 2647 * Fetch and add the MAC address and type, with masks. This generates one or 2648 * two microinstructions, and returns the pointer to the last one. 2649 */ 2650 static ipfw_insn * 2651 add_mac(ipfw_insn *cmd, int ac, char *av[]) 2652 { 2653 ipfw_insn_mac *mac; 2654 2655 if (ac < 2) 2656 errx(EX_DATAERR, "MAC dst src"); 2657 2658 cmd->opcode = O_MACADDR2; 2659 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2660 2661 mac = (ipfw_insn_mac *)cmd; 2662 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2663 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2664 return cmd; 2665 } 2666 2667 static ipfw_insn * 2668 add_mactype(ipfw_insn *cmd, int ac, char *av) 2669 { 2670 if (ac < 1) 2671 errx(EX_DATAERR, "missing MAC type"); 2672 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2673 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2674 cmd->opcode = O_MAC_TYPE; 2675 return cmd; 2676 } else 2677 return NULL; 2678 } 2679 2680 static ipfw_insn * 2681 add_proto(ipfw_insn *cmd, char *av) 2682 { 2683 struct protoent *pe; 2684 u_char proto = 0; 2685 2686 if (!strncmp(av, "all", strlen(av))) 2687 ; /* same as "ip" */ 2688 else if ((proto = atoi(av)) > 0) 2689 ; /* all done! */ 2690 else if ((pe = getprotobyname(av)) != NULL) 2691 proto = pe->p_proto; 2692 else 2693 return NULL; 2694 if (proto != IPPROTO_IP) 2695 fill_cmd(cmd, O_PROTO, 0, proto); 2696 return cmd; 2697 } 2698 2699 static ipfw_insn * 2700 add_srcip(ipfw_insn *cmd, char *av) 2701 { 2702 fill_ip((ipfw_insn_ip *)cmd, av); 2703 if (cmd->opcode == O_IP_DST_SET) /* set */ 2704 cmd->opcode = O_IP_SRC_SET; 2705 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2706 cmd->opcode = O_IP_SRC_LOOKUP; 2707 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2708 cmd->opcode = O_IP_SRC_ME; 2709 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2710 cmd->opcode = O_IP_SRC; 2711 else /* addr/mask */ 2712 cmd->opcode = O_IP_SRC_MASK; 2713 return cmd; 2714 } 2715 2716 static ipfw_insn * 2717 add_dstip(ipfw_insn *cmd, char *av) 2718 { 2719 fill_ip((ipfw_insn_ip *)cmd, av); 2720 if (cmd->opcode == O_IP_DST_SET) /* set */ 2721 ; 2722 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2723 ; 2724 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2725 cmd->opcode = O_IP_DST_ME; 2726 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2727 cmd->opcode = O_IP_DST; 2728 else /* addr/mask */ 2729 cmd->opcode = O_IP_DST_MASK; 2730 return cmd; 2731 } 2732 2733 static ipfw_insn * 2734 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2735 { 2736 if (!strncmp(av, "any", strlen(av))) { 2737 return NULL; 2738 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2739 /* XXX todo: check that we have a protocol with ports */ 2740 cmd->opcode = opcode; 2741 return cmd; 2742 } 2743 return NULL; 2744 } 2745 2746 /* 2747 * Parse arguments and assemble the microinstructions which make up a rule. 2748 * Rules are added into the 'rulebuf' and then copied in the correct order 2749 * into the actual rule. 2750 * 2751 * The syntax for a rule starts with the action, followed by an 2752 * optional log action, and the various match patterns. 2753 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2754 * (generated if the rule includes a keep-state option), then the 2755 * various match patterns, the "log" action, and the actual action. 2756 * 2757 */ 2758 static void 2759 add(int ac, char *av[]) 2760 { 2761 /* 2762 * rules are added into the 'rulebuf' and then copied in 2763 * the correct order into the actual rule. 2764 * Some things that need to go out of order (prob, action etc.) 2765 * go into actbuf[]. 2766 */ 2767 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2768 2769 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2770 ipfw_insn *first_cmd; /* first match pattern */ 2771 2772 struct ip_fw *rule; 2773 2774 /* 2775 * various flags used to record that we entered some fields. 2776 */ 2777 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2778 2779 int i; 2780 2781 int open_par = 0; /* open parenthesis ( */ 2782 2783 /* proto is here because it is used to fetch ports */ 2784 u_char proto = IPPROTO_IP; /* default protocol */ 2785 2786 double match_prob = 1; /* match probability, default is always match */ 2787 2788 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2789 bzero(cmdbuf, sizeof(cmdbuf)); 2790 bzero(rulebuf, sizeof(rulebuf)); 2791 2792 rule = (struct ip_fw *)rulebuf; 2793 cmd = (ipfw_insn *)cmdbuf; 2794 action = (ipfw_insn *)actbuf; 2795 2796 av++; ac--; 2797 2798 /* [rule N] -- Rule number optional */ 2799 if (ac && isdigit(**av)) { 2800 rule->rulenum = atoi(*av); 2801 av++; 2802 ac--; 2803 } 2804 2805 /* [set N] -- set number (0..RESVD_SET), optional */ 2806 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2807 int set = strtoul(av[1], NULL, 10); 2808 if (set < 0 || set > RESVD_SET) 2809 errx(EX_DATAERR, "illegal set %s", av[1]); 2810 rule->set = set; 2811 av += 2; ac -= 2; 2812 } 2813 2814 /* [prob D] -- match probability, optional */ 2815 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2816 match_prob = strtod(av[1], NULL); 2817 2818 if (match_prob <= 0 || match_prob > 1) 2819 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2820 av += 2; ac -= 2; 2821 } 2822 2823 /* action -- mandatory */ 2824 NEED1("missing action"); 2825 i = match_token(rule_actions, *av); 2826 ac--; av++; 2827 action->len = 1; /* default */ 2828 switch(i) { 2829 case TOK_CHECKSTATE: 2830 have_state = action; 2831 action->opcode = O_CHECK_STATE; 2832 break; 2833 2834 case TOK_ACCEPT: 2835 action->opcode = O_ACCEPT; 2836 break; 2837 2838 case TOK_DENY: 2839 action->opcode = O_DENY; 2840 action->arg1 = 0; 2841 break; 2842 2843 case TOK_REJECT: 2844 action->opcode = O_REJECT; 2845 action->arg1 = ICMP_UNREACH_HOST; 2846 break; 2847 2848 case TOK_RESET: 2849 action->opcode = O_REJECT; 2850 action->arg1 = ICMP_REJECT_RST; 2851 break; 2852 2853 case TOK_UNREACH: 2854 action->opcode = O_REJECT; 2855 NEED1("missing reject code"); 2856 fill_reject_code(&action->arg1, *av); 2857 ac--; av++; 2858 break; 2859 2860 case TOK_COUNT: 2861 action->opcode = O_COUNT; 2862 break; 2863 2864 case TOK_QUEUE: 2865 case TOK_PIPE: 2866 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2867 case TOK_SKIPTO: 2868 if (i == TOK_QUEUE) 2869 action->opcode = O_QUEUE; 2870 else if (i == TOK_PIPE) 2871 action->opcode = O_PIPE; 2872 else if (i == TOK_SKIPTO) 2873 action->opcode = O_SKIPTO; 2874 NEED1("missing skipto/pipe/queue number"); 2875 action->arg1 = strtoul(*av, NULL, 10); 2876 av++; ac--; 2877 break; 2878 2879 case TOK_DIVERT: 2880 case TOK_TEE: 2881 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2882 NEED1("missing divert/tee port"); 2883 action->arg1 = strtoul(*av, NULL, 0); 2884 if (action->arg1 == 0) { 2885 struct servent *s; 2886 setservent(1); 2887 s = getservbyname(av[0], "divert"); 2888 if (s != NULL) 2889 action->arg1 = ntohs(s->s_port); 2890 else 2891 errx(EX_DATAERR, "illegal divert/tee port"); 2892 } 2893 ac--; av++; 2894 break; 2895 2896 case TOK_FORWARD: { 2897 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2898 char *s, *end; 2899 2900 NEED1("missing forward address[:port]"); 2901 2902 action->opcode = O_FORWARD_IP; 2903 action->len = F_INSN_SIZE(ipfw_insn_sa); 2904 2905 p->sa.sin_len = sizeof(struct sockaddr_in); 2906 p->sa.sin_family = AF_INET; 2907 p->sa.sin_port = 0; 2908 /* 2909 * locate the address-port separator (':' or ',') 2910 */ 2911 s = strchr(*av, ':'); 2912 if (s == NULL) 2913 s = strchr(*av, ','); 2914 if (s != NULL) { 2915 *(s++) = '\0'; 2916 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2917 if (s == end) 2918 errx(EX_DATAERR, 2919 "illegal forwarding port ``%s''", s); 2920 p->sa.sin_port = (u_short)i; 2921 } 2922 lookup_host(*av, &(p->sa.sin_addr)); 2923 } 2924 ac--; av++; 2925 break; 2926 2927 case TOK_COMMENT: 2928 /* pretend it is a 'count' rule followed by the comment */ 2929 action->opcode = O_COUNT; 2930 ac++; av--; /* go back... */ 2931 break; 2932 2933 default: 2934 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2935 } 2936 action = next_cmd(action); 2937 2938 /* 2939 * [log [logamount N]] -- log, optional 2940 * 2941 * If exists, it goes first in the cmdbuf, but then it is 2942 * skipped in the copy section to the end of the buffer. 2943 */ 2944 if (ac && !strncmp(*av, "log", strlen(*av))) { 2945 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2946 int l; 2947 2948 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2949 cmd->opcode = O_LOG; 2950 av++; ac--; 2951 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2952 ac--; av++; 2953 NEED1("logamount requires argument"); 2954 l = atoi(*av); 2955 if (l < 0) 2956 errx(EX_DATAERR, "logamount must be positive"); 2957 c->max_log = l; 2958 ac--; av++; 2959 } 2960 cmd = next_cmd(cmd); 2961 } 2962 2963 if (have_state) /* must be a check-state, we are done */ 2964 goto done; 2965 2966 #define OR_START(target) \ 2967 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2968 if (open_par) \ 2969 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2970 prev = NULL; \ 2971 open_par = 1; \ 2972 if ( (av[0])[1] == '\0') { \ 2973 ac--; av++; \ 2974 } else \ 2975 (*av)++; \ 2976 } \ 2977 target: \ 2978 2979 2980 #define CLOSE_PAR \ 2981 if (open_par) { \ 2982 if (ac && ( \ 2983 !strncmp(*av, ")", strlen(*av)) || \ 2984 !strncmp(*av, "}", strlen(*av)) )) { \ 2985 prev = NULL; \ 2986 open_par = 0; \ 2987 ac--; av++; \ 2988 } else \ 2989 errx(EX_USAGE, "missing \")\"\n"); \ 2990 } 2991 2992 #define NOT_BLOCK \ 2993 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2994 if (cmd->len & F_NOT) \ 2995 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2996 cmd->len |= F_NOT; \ 2997 ac--; av++; \ 2998 } 2999 3000 #define OR_BLOCK(target) \ 3001 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 3002 if (prev == NULL || open_par == 0) \ 3003 errx(EX_DATAERR, "invalid OR block"); \ 3004 prev->len |= F_OR; \ 3005 ac--; av++; \ 3006 goto target; \ 3007 } \ 3008 CLOSE_PAR; 3009 3010 first_cmd = cmd; 3011 3012 #if 0 3013 /* 3014 * MAC addresses, optional. 3015 * If we have this, we skip the part "proto from src to dst" 3016 * and jump straight to the option parsing. 3017 */ 3018 NOT_BLOCK; 3019 NEED1("missing protocol"); 3020 if (!strncmp(*av, "MAC", strlen(*av)) || 3021 !strncmp(*av, "mac", strlen(*av))) { 3022 ac--; av++; /* the "MAC" keyword */ 3023 add_mac(cmd, ac, av); /* exits in case of errors */ 3024 cmd = next_cmd(cmd); 3025 ac -= 2; av += 2; /* dst-mac and src-mac */ 3026 NOT_BLOCK; 3027 NEED1("missing mac type"); 3028 if (add_mactype(cmd, ac, av[0])) 3029 cmd = next_cmd(cmd); 3030 ac--; av++; /* any or mac-type */ 3031 goto read_options; 3032 } 3033 #endif 3034 3035 /* 3036 * protocol, mandatory 3037 */ 3038 OR_START(get_proto); 3039 NOT_BLOCK; 3040 NEED1("missing protocol"); 3041 if (add_proto(cmd, *av)) { 3042 av++; ac--; 3043 if (F_LEN(cmd) == 0) /* plain IP */ 3044 proto = 0; 3045 else { 3046 proto = cmd->arg1; 3047 prev = cmd; 3048 cmd = next_cmd(cmd); 3049 } 3050 } else if (first_cmd != cmd) { 3051 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3052 } else 3053 goto read_options; 3054 OR_BLOCK(get_proto); 3055 3056 /* 3057 * "from", mandatory 3058 */ 3059 if (!ac || strncmp(*av, "from", strlen(*av))) 3060 errx(EX_USAGE, "missing ``from''"); 3061 ac--; av++; 3062 3063 /* 3064 * source IP, mandatory 3065 */ 3066 OR_START(source_ip); 3067 NOT_BLOCK; /* optional "not" */ 3068 NEED1("missing source address"); 3069 if (add_srcip(cmd, *av)) { 3070 ac--; av++; 3071 if (F_LEN(cmd) != 0) { /* ! any */ 3072 prev = cmd; 3073 cmd = next_cmd(cmd); 3074 } 3075 } 3076 OR_BLOCK(source_ip); 3077 3078 /* 3079 * source ports, optional 3080 */ 3081 NOT_BLOCK; /* optional "not" */ 3082 if (ac) { 3083 if (!strncmp(*av, "any", strlen(*av)) || 3084 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3085 ac--; av++; 3086 if (F_LEN(cmd) != 0) 3087 cmd = next_cmd(cmd); 3088 } 3089 } 3090 3091 /* 3092 * "to", mandatory 3093 */ 3094 if (!ac || strncmp(*av, "to", strlen(*av))) 3095 errx(EX_USAGE, "missing ``to''"); 3096 av++; ac--; 3097 3098 /* 3099 * destination, mandatory 3100 */ 3101 OR_START(dest_ip); 3102 NOT_BLOCK; /* optional "not" */ 3103 NEED1("missing dst address"); 3104 if (add_dstip(cmd, *av)) { 3105 ac--; av++; 3106 if (F_LEN(cmd) != 0) { /* ! any */ 3107 prev = cmd; 3108 cmd = next_cmd(cmd); 3109 } 3110 } 3111 OR_BLOCK(dest_ip); 3112 3113 /* 3114 * dest. ports, optional 3115 */ 3116 NOT_BLOCK; /* optional "not" */ 3117 if (ac) { 3118 if (!strncmp(*av, "any", strlen(*av)) || 3119 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3120 ac--; av++; 3121 if (F_LEN(cmd) != 0) 3122 cmd = next_cmd(cmd); 3123 } 3124 } 3125 3126 read_options: 3127 if (ac && first_cmd == cmd) { 3128 /* 3129 * nothing specified so far, store in the rule to ease 3130 * printout later. 3131 */ 3132 rule->_pad = 1; 3133 } 3134 prev = NULL; 3135 while (ac) { 3136 char *s; 3137 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3138 3139 s = *av; 3140 cmd32 = (ipfw_insn_u32 *)cmd; 3141 3142 if (*s == '!') { /* alternate syntax for NOT */ 3143 if (cmd->len & F_NOT) 3144 errx(EX_USAGE, "double \"not\" not allowed\n"); 3145 cmd->len = F_NOT; 3146 s++; 3147 } 3148 i = match_token(rule_options, s); 3149 ac--; av++; 3150 switch(i) { 3151 case TOK_NOT: 3152 if (cmd->len & F_NOT) 3153 errx(EX_USAGE, "double \"not\" not allowed\n"); 3154 cmd->len = F_NOT; 3155 break; 3156 3157 case TOK_OR: 3158 if (open_par == 0 || prev == NULL) 3159 errx(EX_USAGE, "invalid \"or\" block\n"); 3160 prev->len |= F_OR; 3161 break; 3162 3163 case TOK_STARTBRACE: 3164 if (open_par) 3165 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3166 open_par = 1; 3167 break; 3168 3169 case TOK_ENDBRACE: 3170 if (!open_par) 3171 errx(EX_USAGE, "+missing \")\"\n"); 3172 open_par = 0; 3173 prev = NULL; 3174 break; 3175 3176 case TOK_IN: 3177 fill_cmd(cmd, O_IN, 0, 0); 3178 break; 3179 3180 case TOK_OUT: 3181 cmd->len ^= F_NOT; /* toggle F_NOT */ 3182 fill_cmd(cmd, O_IN, 0, 0); 3183 break; 3184 3185 case TOK_FRAG: 3186 fill_cmd(cmd, O_FRAG, 0, 0); 3187 break; 3188 3189 case TOK_LAYER2: 3190 fill_cmd(cmd, O_LAYER2, 0, 0); 3191 break; 3192 3193 case TOK_XMIT: 3194 case TOK_RECV: 3195 case TOK_VIA: 3196 NEED1("recv, xmit, via require interface name" 3197 " or address"); 3198 fill_iface((ipfw_insn_if *)cmd, av[0]); 3199 ac--; av++; 3200 if (F_LEN(cmd) == 0) /* not a valid address */ 3201 break; 3202 if (i == TOK_XMIT) 3203 cmd->opcode = O_XMIT; 3204 else if (i == TOK_RECV) 3205 cmd->opcode = O_RECV; 3206 else if (i == TOK_VIA) 3207 cmd->opcode = O_VIA; 3208 break; 3209 3210 case TOK_ICMPTYPES: 3211 NEED1("icmptypes requires list of types"); 3212 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3213 av++; ac--; 3214 break; 3215 3216 case TOK_IPTTL: 3217 NEED1("ipttl requires TTL"); 3218 if (strpbrk(*av, "-,")) { 3219 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3220 errx(EX_DATAERR, "invalid ipttl %s", *av); 3221 } else 3222 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3223 ac--; av++; 3224 break; 3225 3226 case TOK_IPID: 3227 NEED1("ipid requires id"); 3228 if (strpbrk(*av, "-,")) { 3229 if (!add_ports(cmd, *av, 0, O_IPID)) 3230 errx(EX_DATAERR, "invalid ipid %s", *av); 3231 } else 3232 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3233 ac--; av++; 3234 break; 3235 3236 case TOK_IPLEN: 3237 NEED1("iplen requires length"); 3238 if (strpbrk(*av, "-,")) { 3239 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3240 errx(EX_DATAERR, "invalid ip len %s", *av); 3241 } else 3242 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3243 ac--; av++; 3244 break; 3245 3246 case TOK_IPVER: 3247 NEED1("ipver requires version"); 3248 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3249 ac--; av++; 3250 break; 3251 3252 case TOK_IPPRECEDENCE: 3253 NEED1("ipprecedence requires value"); 3254 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3255 (strtoul(*av, NULL, 0) & 7) << 5); 3256 ac--; av++; 3257 break; 3258 3259 case TOK_IPOPTS: 3260 NEED1("missing argument for ipoptions"); 3261 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3262 ac--; av++; 3263 break; 3264 3265 case TOK_IPTOS: 3266 NEED1("missing argument for iptos"); 3267 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3268 ac--; av++; 3269 break; 3270 3271 case TOK_UID: 3272 NEED1("uid requires argument"); 3273 { 3274 char *end; 3275 uid_t uid; 3276 struct passwd *pwd; 3277 3278 cmd->opcode = O_UID; 3279 uid = strtoul(*av, &end, 0); 3280 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3281 if (pwd == NULL) 3282 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3283 cmd32->d[0] = pwd->pw_uid; 3284 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3285 ac--; av++; 3286 } 3287 break; 3288 3289 case TOK_GID: 3290 NEED1("gid requires argument"); 3291 { 3292 char *end; 3293 gid_t gid; 3294 struct group *grp; 3295 3296 cmd->opcode = O_GID; 3297 gid = strtoul(*av, &end, 0); 3298 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3299 if (grp == NULL) 3300 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3301 cmd32->d[0] = grp->gr_gid; 3302 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3303 ac--; av++; 3304 } 3305 break; 3306 3307 case TOK_JAIL: 3308 NEED1("jail requires argument"); 3309 { 3310 char *end; 3311 int jid; 3312 3313 cmd->opcode = O_JAIL; 3314 jid = (int)strtol(*av, &end, 0); 3315 if (jid < 0 || *end != '\0') 3316 errx(EX_DATAERR, "jail requires prison ID"); 3317 cmd32->d[0] = (unsigned int)jid; 3318 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3319 ac--; av++; 3320 } 3321 break; 3322 3323 case TOK_ESTAB: 3324 fill_cmd(cmd, O_ESTAB, 0, 0); 3325 break; 3326 3327 case TOK_SETUP: 3328 fill_cmd(cmd, O_TCPFLAGS, 0, 3329 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3330 break; 3331 3332 case TOK_TCPOPTS: 3333 NEED1("missing argument for tcpoptions"); 3334 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3335 ac--; av++; 3336 break; 3337 3338 case TOK_TCPSEQ: 3339 case TOK_TCPACK: 3340 NEED1("tcpseq/tcpack requires argument"); 3341 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3342 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3343 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3344 ac--; av++; 3345 break; 3346 3347 case TOK_TCPWIN: 3348 NEED1("tcpwin requires length"); 3349 fill_cmd(cmd, O_TCPWIN, 0, 3350 htons(strtoul(*av, NULL, 0))); 3351 ac--; av++; 3352 break; 3353 3354 case TOK_TCPFLAGS: 3355 NEED1("missing argument for tcpflags"); 3356 cmd->opcode = O_TCPFLAGS; 3357 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3358 ac--; av++; 3359 break; 3360 3361 case TOK_KEEPSTATE: 3362 if (open_par) 3363 errx(EX_USAGE, "keep-state cannot be part " 3364 "of an or block"); 3365 if (have_state) 3366 errx(EX_USAGE, "only one of keep-state " 3367 "and limit is allowed"); 3368 have_state = cmd; 3369 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3370 break; 3371 3372 case TOK_LIMIT: 3373 if (open_par) 3374 errx(EX_USAGE, "limit cannot be part " 3375 "of an or block"); 3376 if (have_state) 3377 errx(EX_USAGE, "only one of keep-state " 3378 "and limit is allowed"); 3379 NEED1("limit needs mask and # of connections"); 3380 have_state = cmd; 3381 { 3382 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3383 3384 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3385 cmd->opcode = O_LIMIT; 3386 c->limit_mask = 0; 3387 c->conn_limit = 0; 3388 for (; ac >1 ;) { 3389 int val; 3390 3391 val = match_token(limit_masks, *av); 3392 if (val <= 0) 3393 break; 3394 c->limit_mask |= val; 3395 ac--; av++; 3396 } 3397 c->conn_limit = atoi(*av); 3398 if (c->conn_limit == 0) 3399 errx(EX_USAGE, "limit: limit must be >0"); 3400 if (c->limit_mask == 0) 3401 errx(EX_USAGE, "missing limit mask"); 3402 ac--; av++; 3403 } 3404 break; 3405 3406 case TOK_PROTO: 3407 NEED1("missing protocol"); 3408 if (add_proto(cmd, *av)) { 3409 proto = cmd->arg1; 3410 ac--; av++; 3411 } else 3412 errx(EX_DATAERR, "invalid protocol ``%s''", 3413 *av); 3414 break; 3415 3416 case TOK_SRCIP: 3417 NEED1("missing source IP"); 3418 if (add_srcip(cmd, *av)) { 3419 ac--; av++; 3420 } 3421 break; 3422 3423 case TOK_DSTIP: 3424 NEED1("missing destination IP"); 3425 if (add_dstip(cmd, *av)) { 3426 ac--; av++; 3427 } 3428 break; 3429 3430 case TOK_SRCPORT: 3431 NEED1("missing source port"); 3432 if (!strncmp(*av, "any", strlen(*av)) || 3433 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3434 ac--; av++; 3435 } else 3436 errx(EX_DATAERR, "invalid source port %s", *av); 3437 break; 3438 3439 case TOK_DSTPORT: 3440 NEED1("missing destination port"); 3441 if (!strncmp(*av, "any", strlen(*av)) || 3442 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3443 ac--; av++; 3444 } else 3445 errx(EX_DATAERR, "invalid destination port %s", 3446 *av); 3447 break; 3448 3449 case TOK_MAC: 3450 if (add_mac(cmd, ac, av)) { 3451 ac -= 2; av += 2; 3452 } 3453 break; 3454 3455 case TOK_MACTYPE: 3456 NEED1("missing mac type"); 3457 if (!add_mactype(cmd, ac, *av)) 3458 errx(EX_DATAERR, "invalid mac type %s", *av); 3459 ac--; av++; 3460 break; 3461 3462 case TOK_VERREVPATH: 3463 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3464 break; 3465 3466 case TOK_VERSRCREACH: 3467 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3468 break; 3469 3470 case TOK_ANTISPOOF: 3471 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3472 break; 3473 3474 case TOK_IPSEC: 3475 fill_cmd(cmd, O_IPSEC, 0, 0); 3476 break; 3477 3478 case TOK_COMMENT: 3479 fill_comment(cmd, ac, av); 3480 av += ac; 3481 ac = 0; 3482 break; 3483 3484 default: 3485 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3486 } 3487 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3488 prev = cmd; 3489 cmd = next_cmd(cmd); 3490 } 3491 } 3492 3493 done: 3494 /* 3495 * Now copy stuff into the rule. 3496 * If we have a keep-state option, the first instruction 3497 * must be a PROBE_STATE (which is generated here). 3498 * If we have a LOG option, it was stored as the first command, 3499 * and now must be moved to the top of the action part. 3500 */ 3501 dst = (ipfw_insn *)rule->cmd; 3502 3503 /* 3504 * First thing to write into the command stream is the match probability. 3505 */ 3506 if (match_prob != 1) { /* 1 means always match */ 3507 dst->opcode = O_PROB; 3508 dst->len = 2; 3509 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3510 dst += dst->len; 3511 } 3512 3513 /* 3514 * generate O_PROBE_STATE if necessary 3515 */ 3516 if (have_state && have_state->opcode != O_CHECK_STATE) { 3517 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3518 dst = next_cmd(dst); 3519 } 3520 /* 3521 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3522 */ 3523 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3524 i = F_LEN(src); 3525 3526 switch (src->opcode) { 3527 case O_LOG: 3528 case O_KEEP_STATE: 3529 case O_LIMIT: 3530 break; 3531 default: 3532 bcopy(src, dst, i * sizeof(uint32_t)); 3533 dst += i; 3534 } 3535 } 3536 3537 /* 3538 * put back the have_state command as last opcode 3539 */ 3540 if (have_state && have_state->opcode != O_CHECK_STATE) { 3541 i = F_LEN(have_state); 3542 bcopy(have_state, dst, i * sizeof(uint32_t)); 3543 dst += i; 3544 } 3545 /* 3546 * start action section 3547 */ 3548 rule->act_ofs = dst - rule->cmd; 3549 3550 /* 3551 * put back O_LOG if necessary 3552 */ 3553 src = (ipfw_insn *)cmdbuf; 3554 if (src->opcode == O_LOG) { 3555 i = F_LEN(src); 3556 bcopy(src, dst, i * sizeof(uint32_t)); 3557 dst += i; 3558 } 3559 /* 3560 * copy all other actions 3561 */ 3562 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3563 i = F_LEN(src); 3564 bcopy(src, dst, i * sizeof(uint32_t)); 3565 dst += i; 3566 } 3567 3568 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3569 i = (char *)dst - (char *)rule; 3570 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3571 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3572 if (!do_quiet) 3573 show_ipfw(rule, 0, 0); 3574 } 3575 3576 static void 3577 zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) 3578 { 3579 int rulenum; 3580 int failed = EX_OK; 3581 char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; 3582 3583 av++; ac--; 3584 3585 if (!ac) { 3586 /* clear all entries */ 3587 if (do_cmd(optname, NULL, 0) < 0) 3588 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3589 if (!do_quiet) 3590 printf("%s.\n", optname == IP_FW_ZERO ? 3591 "Accounting cleared":"Logging counts reset"); 3592 3593 return; 3594 } 3595 3596 while (ac) { 3597 /* Rule number */ 3598 if (isdigit(**av)) { 3599 rulenum = atoi(*av); 3600 av++; 3601 ac--; 3602 if (do_cmd(optname, &rulenum, sizeof rulenum)) { 3603 warn("rule %u: setsockopt(IP_FW_%s)", 3604 rulenum, name); 3605 failed = EX_UNAVAILABLE; 3606 } else if (!do_quiet) 3607 printf("Entry %d %s.\n", rulenum, 3608 optname == IP_FW_ZERO ? 3609 "cleared" : "logging count reset"); 3610 } else { 3611 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3612 } 3613 } 3614 if (failed != EX_OK) 3615 exit(failed); 3616 } 3617 3618 static void 3619 flush(int force) 3620 { 3621 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3622 3623 if (!force && !do_quiet) { /* need to ask user */ 3624 int c; 3625 3626 printf("Are you sure? [yn] "); 3627 fflush(stdout); 3628 do { 3629 c = toupper(getc(stdin)); 3630 while (c != '\n' && getc(stdin) != '\n') 3631 if (feof(stdin)) 3632 return; /* and do not flush */ 3633 } while (c != 'Y' && c != 'N'); 3634 printf("\n"); 3635 if (c == 'N') /* user said no */ 3636 return; 3637 } 3638 if (do_cmd(cmd, NULL, 0) < 0) 3639 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3640 do_pipe ? "DUMMYNET" : "FW"); 3641 if (!do_quiet) 3642 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3643 } 3644 3645 /* 3646 * Free a the (locally allocated) copy of command line arguments. 3647 */ 3648 static void 3649 free_args(int ac, char **av) 3650 { 3651 int i; 3652 3653 for (i=0; i < ac; i++) 3654 free(av[i]); 3655 free(av); 3656 } 3657 3658 /* 3659 * This one handles all table-related commands 3660 * ipfw table N add addr[/masklen] [value] 3661 * ipfw table N delete addr[/masklen] 3662 * ipfw table N flush 3663 * ipfw table N list 3664 */ 3665 static void 3666 table_handler(int ac, char *av[]) 3667 { 3668 ipfw_table_entry ent; 3669 ipfw_table *tbl; 3670 int do_add; 3671 char *p; 3672 socklen_t l; 3673 uint32_t a; 3674 3675 ac--; av++; 3676 if (ac && isdigit(**av)) { 3677 ent.tbl = atoi(*av); 3678 ac--; av++; 3679 } else 3680 errx(EX_USAGE, "table number required"); 3681 NEED1("table needs command"); 3682 if (strncmp(*av, "add", strlen(*av)) == 0 || 3683 strncmp(*av, "delete", strlen(*av)) == 0) { 3684 do_add = **av == 'a'; 3685 ac--; av++; 3686 if (!ac) 3687 errx(EX_USAGE, "IP address required"); 3688 p = strchr(*av, '/'); 3689 if (p) { 3690 *p++ = '\0'; 3691 ent.masklen = atoi(p); 3692 if (ent.masklen > 32) 3693 errx(EX_DATAERR, "bad width ``%s''", p); 3694 } else 3695 ent.masklen = 32; 3696 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3697 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3698 ac--; av++; 3699 if (do_add && ac) 3700 ent.value = strtoul(*av, NULL, 0); 3701 else 3702 ent.value = 0; 3703 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3704 &ent, sizeof(ent)) < 0) 3705 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3706 do_add ? "ADD" : "DEL"); 3707 } else if (strncmp(*av, "flush", strlen(*av)) == 0) { 3708 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, sizeof(ent.tbl)) < 0) 3709 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3710 } else if (strncmp(*av, "list", strlen(*av)) == 0) { 3711 a = ent.tbl; 3712 l = sizeof(a); 3713 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3714 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3715 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3716 tbl = malloc(l); 3717 if (tbl == NULL) 3718 err(EX_OSERR, "malloc"); 3719 tbl->tbl = ent.tbl; 3720 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3721 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3722 for (a = 0; a < tbl->cnt; a++) { 3723 printf("%s/%u %u\n", 3724 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3725 tbl->ent[a].masklen, tbl->ent[a].value); 3726 } 3727 } else 3728 errx(EX_USAGE, "invalid table command %s", *av); 3729 } 3730 3731 /* 3732 * Called with the arguments (excluding program name). 3733 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 3734 */ 3735 static int 3736 ipfw_main(int oldac, char **oldav) 3737 { 3738 int ch, ac, save_ac; 3739 char **av, **save_av; 3740 int do_acct = 0; /* Show packet/byte count */ 3741 3742 #define WHITESP " \t\f\v\n\r" 3743 if (oldac == 0) 3744 return 1; 3745 else if (oldac == 1) { 3746 /* 3747 * If we are called with a single string, try to split it into 3748 * arguments for subsequent parsing. 3749 * But first, remove spaces after a ',', by copying the string 3750 * in-place. 3751 */ 3752 char *arg = oldav[0]; /* The string... */ 3753 int l = strlen(arg); 3754 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 3755 int i, j; 3756 for (i = j = 0; i < l; i++) { 3757 if (arg[i] == '#') /* comment marker */ 3758 break; 3759 if (copy) { 3760 arg[j++] = arg[i]; 3761 copy = !index("," WHITESP, arg[i]); 3762 } else { 3763 copy = !index(WHITESP, arg[i]); 3764 if (copy) 3765 arg[j++] = arg[i]; 3766 } 3767 } 3768 if (!copy && j > 0) /* last char was a 'blank', remove it */ 3769 j--; 3770 l = j; /* the new argument length */ 3771 arg[j++] = '\0'; 3772 if (l == 0) /* empty string! */ 3773 return 1; 3774 3775 /* 3776 * First, count number of arguments. Because of the previous 3777 * processing, this is just the number of blanks plus 1. 3778 */ 3779 for (i = 0, ac = 1; i < l; i++) 3780 if (index(WHITESP, arg[i]) != NULL) 3781 ac++; 3782 3783 av = calloc(ac, sizeof(char *)); 3784 3785 /* 3786 * Second, copy arguments from cmd[] to av[]. For each one, 3787 * j is the initial character, i is the one past the end. 3788 */ 3789 for (ac = 0, i = j = 0; i < l; i++) 3790 if (index(WHITESP, arg[i]) != NULL || i == l-1) { 3791 if (i == l-1) 3792 i++; 3793 av[ac] = calloc(i-j+1, 1); 3794 bcopy(arg+j, av[ac], i-j); 3795 ac++; 3796 j = i + 1; 3797 } 3798 } else { 3799 /* 3800 * If an argument ends with ',' join with the next one. 3801 */ 3802 int first, i, l; 3803 3804 av = calloc(oldac, sizeof(char *)); 3805 for (first = i = ac = 0, l = 0; i < oldac; i++) { 3806 char *arg = oldav[i]; 3807 int k = strlen(arg); 3808 3809 l += k; 3810 if (arg[k-1] != ',' || i == oldac-1) { 3811 /* Time to copy. */ 3812 av[ac] = calloc(l+1, 1); 3813 for (l=0; first <= i; first++) { 3814 strcat(av[ac]+l, oldav[first]); 3815 l += strlen(oldav[first]); 3816 } 3817 ac++; 3818 l = 0; 3819 first = i+1; 3820 } 3821 } 3822 } 3823 3824 /* Set the force flag for non-interactive processes */ 3825 if (!do_force) 3826 do_force = !isatty(STDIN_FILENO); 3827 3828 /* Save arguments for final freeing of memory. */ 3829 save_ac = ac; 3830 save_av = av; 3831 3832 optind = optreset = 0; 3833 while ((ch = getopt(ac, av, "abcdefhnNqs:STtv")) != -1) 3834 switch (ch) { 3835 case 'a': 3836 do_acct = 1; 3837 break; 3838 3839 case 'b': 3840 comment_only = 1; 3841 do_compact = 1; 3842 break; 3843 3844 case 'c': 3845 do_compact = 1; 3846 break; 3847 3848 case 'd': 3849 do_dynamic = 1; 3850 break; 3851 3852 case 'e': 3853 do_expired = 1; 3854 break; 3855 3856 case 'f': 3857 do_force = 1; 3858 break; 3859 3860 case 'h': /* help */ 3861 free_args(save_ac, save_av); 3862 help(); 3863 break; /* NOTREACHED */ 3864 3865 case 'n': 3866 test_only = 1; 3867 break; 3868 3869 case 'N': 3870 do_resolv = 1; 3871 break; 3872 3873 case 'q': 3874 do_quiet = 1; 3875 break; 3876 3877 case 's': /* sort */ 3878 do_sort = atoi(optarg); 3879 break; 3880 3881 case 'S': 3882 show_sets = 1; 3883 break; 3884 3885 case 't': 3886 do_time = 1; 3887 break; 3888 3889 case 'T': 3890 do_time = 2; /* numeric timestamp */ 3891 break; 3892 3893 case 'v': /* verbose */ 3894 verbose = 1; 3895 break; 3896 3897 default: 3898 free_args(save_ac, save_av); 3899 return 1; 3900 } 3901 3902 ac -= optind; 3903 av += optind; 3904 NEED1("bad arguments, for usage summary ``ipfw''"); 3905 3906 /* 3907 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 3908 * e.g. "100 add allow ..." instead of "add 100 allow ...". 3909 * In case, swap first and second argument to get the normal form. 3910 */ 3911 if (ac > 1 && isdigit(*av[0])) { 3912 char *p = av[0]; 3913 3914 av[0] = av[1]; 3915 av[1] = p; 3916 } 3917 3918 /* 3919 * optional: pipe or queue 3920 */ 3921 do_pipe = 0; 3922 if (!strncmp(*av, "pipe", strlen(*av))) 3923 do_pipe = 1; 3924 else if (!strncmp(*av, "queue", strlen(*av))) 3925 do_pipe = 2; 3926 if (do_pipe) { 3927 ac--; 3928 av++; 3929 } 3930 NEED1("missing command"); 3931 3932 /* 3933 * For pipes and queues we normally say 'pipe NN config' 3934 * but the code is easier to parse as 'pipe config NN' 3935 * so we swap the two arguments. 3936 */ 3937 if (do_pipe > 0 && ac > 1 && isdigit(*av[0])) { 3938 char *p = av[0]; 3939 3940 av[0] = av[1]; 3941 av[1] = p; 3942 } 3943 3944 if (!strncmp(*av, "add", strlen(*av))) 3945 add(ac, av); 3946 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3947 config_pipe(ac, av); 3948 else if (!strncmp(*av, "delete", strlen(*av))) 3949 delete(ac, av); 3950 else if (!strncmp(*av, "flush", strlen(*av))) 3951 flush(do_force); 3952 else if (!strncmp(*av, "zero", strlen(*av))) 3953 zero(ac, av, IP_FW_ZERO); 3954 else if (!strncmp(*av, "resetlog", strlen(*av))) 3955 zero(ac, av, IP_FW_RESETLOG); 3956 else if (!strncmp(*av, "print", strlen(*av)) || 3957 !strncmp(*av, "list", strlen(*av))) 3958 list(ac, av, do_acct); 3959 else if (!strncmp(*av, "set", strlen(*av))) 3960 sets_handler(ac, av); 3961 else if (!strncmp(*av, "table", strlen(*av))) 3962 table_handler(ac, av); 3963 else if (!strncmp(*av, "enable", strlen(*av))) 3964 sysctl_handler(ac, av, 1); 3965 else if (!strncmp(*av, "disable", strlen(*av))) 3966 sysctl_handler(ac, av, 0); 3967 else if (!strncmp(*av, "show", strlen(*av))) 3968 list(ac, av, 1 /* show counters */); 3969 else 3970 errx(EX_USAGE, "bad command `%s'", *av); 3971 3972 /* Free memory allocated in the argument parsing. */ 3973 free_args(save_ac, save_av); 3974 return 0; 3975 } 3976 3977 3978 static void 3979 ipfw_readfile(int ac, char *av[]) 3980 { 3981 #define MAX_ARGS 32 3982 char buf[BUFSIZ]; 3983 char *cmd = NULL, *filename = av[ac-1]; 3984 int c, lineno=0; 3985 FILE *f = NULL; 3986 pid_t preproc = 0; 3987 3988 filename = av[ac-1]; 3989 3990 while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { 3991 switch(c) { 3992 case 'c': 3993 do_compact = 1; 3994 break; 3995 3996 case 'f': 3997 do_force = 1; 3998 break; 3999 4000 case 'N': 4001 do_resolv = 1; 4002 break; 4003 4004 case 'n': 4005 test_only = 1; 4006 break; 4007 4008 case 'p': 4009 cmd = optarg; 4010 /* 4011 * Skip previous args and delete last one, so we 4012 * pass all but the last argument to the preprocessor 4013 * via av[optind-1] 4014 */ 4015 av += optind - 1; 4016 ac -= optind - 1; 4017 av[ac-1] = NULL; 4018 fprintf(stderr, "command is %s\n", av[0]); 4019 break; 4020 4021 case 'q': 4022 do_quiet = 1; 4023 break; 4024 4025 case 'S': 4026 show_sets = 1; 4027 break; 4028 4029 default: 4030 errx(EX_USAGE, "bad arguments, for usage" 4031 " summary ``ipfw''"); 4032 } 4033 4034 if (cmd != NULL) 4035 break; 4036 } 4037 4038 if (cmd == NULL && ac != optind + 1) { 4039 fprintf(stderr, "ac %d, optind %d\n", ac, optind); 4040 errx(EX_USAGE, "extraneous filename arguments"); 4041 } 4042 4043 if ((f = fopen(filename, "r")) == NULL) 4044 err(EX_UNAVAILABLE, "fopen: %s", filename); 4045 4046 if (cmd != NULL) { /* pipe through preprocessor */ 4047 int pipedes[2]; 4048 4049 if (pipe(pipedes) == -1) 4050 err(EX_OSERR, "cannot create pipe"); 4051 4052 preproc = fork(); 4053 if (preproc == -1) 4054 err(EX_OSERR, "cannot fork"); 4055 4056 if (preproc == 0) { 4057 /* 4058 * Child, will run the preprocessor with the 4059 * file on stdin and the pipe on stdout. 4060 */ 4061 if (dup2(fileno(f), 0) == -1 4062 || dup2(pipedes[1], 1) == -1) 4063 err(EX_OSERR, "dup2()"); 4064 fclose(f); 4065 close(pipedes[1]); 4066 close(pipedes[0]); 4067 execvp(cmd, av); 4068 err(EX_OSERR, "execvp(%s) failed", cmd); 4069 } else { /* parent, will reopen f as the pipe */ 4070 fclose(f); 4071 close(pipedes[1]); 4072 if ((f = fdopen(pipedes[0], "r")) == NULL) { 4073 int savederrno = errno; 4074 4075 (void)kill(preproc, SIGTERM); 4076 errno = savederrno; 4077 err(EX_OSERR, "fdopen()"); 4078 } 4079 } 4080 } 4081 4082 while (fgets(buf, BUFSIZ, f)) { /* read commands */ 4083 char linename[10]; 4084 char *args[1]; 4085 4086 lineno++; 4087 sprintf(linename, "Line %d", lineno); 4088 setprogname(linename); /* XXX */ 4089 args[0] = buf; 4090 ipfw_main(1, args); 4091 } 4092 fclose(f); 4093 if (cmd != NULL) { 4094 int status; 4095 4096 if (waitpid(preproc, &status, 0) == -1) 4097 errx(EX_OSERR, "waitpid()"); 4098 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 4099 errx(EX_UNAVAILABLE, 4100 "preprocessor exited with status %d", 4101 WEXITSTATUS(status)); 4102 else if (WIFSIGNALED(status)) 4103 errx(EX_UNAVAILABLE, 4104 "preprocessor exited with signal %d", 4105 WTERMSIG(status)); 4106 } 4107 } 4108 4109 int 4110 main(int ac, char *av[]) 4111 { 4112 /* 4113 * If the last argument is an absolute pathname, interpret it 4114 * as a file to be preprocessed. 4115 */ 4116 4117 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 4118 ipfw_readfile(ac, av); 4119 else { 4120 if (ipfw_main(ac-1, av+1)) 4121 show_usage(); 4122 } 4123 return EX_OK; 4124 } 4125