ipfw2.c revision 108231
1/* 2 * Copyright (c) 2002 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: head/sbin/ipfw/ipfw2.c 108231 2002-12-23 20:08:21Z kbyanc $ 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> 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 <net/route.h> /* def. of struct route */ 54#include <netinet/ip_dummynet.h> 55#include <netinet/tcp.h> 56#include <arpa/inet.h> 57 58int s, /* main RAW socket */ 59 do_resolv, /* Would try to resolve all */ 60 do_acct, /* Show packet/byte count */ 61 do_time, /* Show time stamps */ 62 do_quiet, /* Be quiet in add and flush */ 63 do_force, /* Don't ask for confirmation */ 64 do_pipe, /* this cmd refers to a pipe */ 65 do_sort, /* field to sort results (0 = no) */ 66 do_dynamic, /* display dynamic rules */ 67 do_expired, /* display expired dynamic rules */ 68 do_compact, /* show rules in compact mode */ 69 show_sets, /* display rule sets */ 70 verbose; 71 72#define IP_MASK_ALL 0xffffffff 73 74/* 75 * structure to hold flag names and associated values to be 76 * set in the appropriate masks. 77 * A NULL string terminates the array. 78 * Often, an element with 0 value contains an error string. 79 * 80 */ 81struct _s_x { 82 char *s; 83 int x; 84}; 85 86static struct _s_x f_tcpflags[] = { 87 { "syn", TH_SYN }, 88 { "fin", TH_FIN }, 89 { "ack", TH_ACK }, 90 { "psh", TH_PUSH }, 91 { "rst", TH_RST }, 92 { "urg", TH_URG }, 93 { "tcp flag", 0 }, 94 { NULL, 0 } 95}; 96 97static struct _s_x f_tcpopts[] = { 98 { "mss", IP_FW_TCPOPT_MSS }, 99 { "maxseg", IP_FW_TCPOPT_MSS }, 100 { "window", IP_FW_TCPOPT_WINDOW }, 101 { "sack", IP_FW_TCPOPT_SACK }, 102 { "ts", IP_FW_TCPOPT_TS }, 103 { "timestamp", IP_FW_TCPOPT_TS }, 104 { "cc", IP_FW_TCPOPT_CC }, 105 { "tcp option", 0 }, 106 { NULL, 0 } 107}; 108 109/* 110 * IP options span the range 0 to 255 so we need to remap them 111 * (though in fact only the low 5 bits are significant). 112 */ 113static struct _s_x f_ipopts[] = { 114 { "ssrr", IP_FW_IPOPT_SSRR}, 115 { "lsrr", IP_FW_IPOPT_LSRR}, 116 { "rr", IP_FW_IPOPT_RR}, 117 { "ts", IP_FW_IPOPT_TS}, 118 { "ip option", 0 }, 119 { NULL, 0 } 120}; 121 122static struct _s_x f_iptos[] = { 123 { "lowdelay", IPTOS_LOWDELAY}, 124 { "throughput", IPTOS_THROUGHPUT}, 125 { "reliability", IPTOS_RELIABILITY}, 126 { "mincost", IPTOS_MINCOST}, 127 { "congestion", IPTOS_CE}, 128 { "ecntransport", IPTOS_ECT}, 129 { "ip tos option", 0}, 130 { NULL, 0 } 131}; 132 133static struct _s_x limit_masks[] = { 134 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 135 {"src-addr", DYN_SRC_ADDR}, 136 {"src-port", DYN_SRC_PORT}, 137 {"dst-addr", DYN_DST_ADDR}, 138 {"dst-port", DYN_DST_PORT}, 139 {NULL, 0} 140}; 141 142/* 143 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 144 * This is only used in this code. 145 */ 146#define IPPROTO_ETHERTYPE 0x1000 147static struct _s_x ether_types[] = { 148 /* 149 * Note, we cannot use "-:&/" in the names because they are field 150 * separators in the type specifications. Also, we use s = NULL as 151 * end-delimiter, because a type of 0 can be legal. 152 */ 153 { "ip", 0x0800 }, 154 { "ipv4", 0x0800 }, 155 { "ipv6", 0x86dd }, 156 { "arp", 0x0806 }, 157 { "rarp", 0x8035 }, 158 { "vlan", 0x8100 }, 159 { "loop", 0x9000 }, 160 { "trail", 0x1000 }, 161 { "at", 0x809b }, 162 { "atalk", 0x809b }, 163 { "aarp", 0x80f3 }, 164 { "pppoe_disc", 0x8863 }, 165 { "pppoe_sess", 0x8864 }, 166 { "ipx_8022", 0x00E0 }, 167 { "ipx_8023", 0x0000 }, 168 { "ipx_ii", 0x8137 }, 169 { "ipx_snap", 0x8137 }, 170 { "ipx", 0x8137 }, 171 { "ns", 0x0600 }, 172 { NULL, 0 } 173}; 174 175static void show_usage(void); 176 177enum tokens { 178 TOK_NULL=0, 179 180 TOK_OR, 181 TOK_NOT, 182 TOK_STARTBRACE, 183 TOK_ENDBRACE, 184 185 TOK_ACCEPT, 186 TOK_COUNT, 187 TOK_PIPE, 188 TOK_QUEUE, 189 TOK_DIVERT, 190 TOK_TEE, 191 TOK_FORWARD, 192 TOK_SKIPTO, 193 TOK_DENY, 194 TOK_REJECT, 195 TOK_RESET, 196 TOK_UNREACH, 197 TOK_CHECKSTATE, 198 199 TOK_UID, 200 TOK_GID, 201 TOK_IN, 202 TOK_LIMIT, 203 TOK_KEEPSTATE, 204 TOK_LAYER2, 205 TOK_OUT, 206 TOK_XMIT, 207 TOK_RECV, 208 TOK_VIA, 209 TOK_FRAG, 210 TOK_IPOPTS, 211 TOK_IPLEN, 212 TOK_IPID, 213 TOK_IPPRECEDENCE, 214 TOK_IPTOS, 215 TOK_IPTTL, 216 TOK_IPVER, 217 TOK_ESTAB, 218 TOK_SETUP, 219 TOK_TCPFLAGS, 220 TOK_TCPOPTS, 221 TOK_TCPSEQ, 222 TOK_TCPACK, 223 TOK_TCPWIN, 224 TOK_ICMPTYPES, 225 TOK_MAC, 226 TOK_MACTYPE, 227 228 TOK_PLR, 229 TOK_NOERROR, 230 TOK_BUCKETS, 231 TOK_DSTIP, 232 TOK_SRCIP, 233 TOK_DSTPORT, 234 TOK_SRCPORT, 235 TOK_ALL, 236 TOK_MASK, 237 TOK_BW, 238 TOK_DELAY, 239 TOK_RED, 240 TOK_GRED, 241 TOK_DROPTAIL, 242 TOK_PROTO, 243 TOK_WEIGHT, 244}; 245 246struct _s_x dummynet_params[] = { 247 { "plr", TOK_PLR }, 248 { "noerror", TOK_NOERROR }, 249 { "buckets", TOK_BUCKETS }, 250 { "dst-ip", TOK_DSTIP }, 251 { "src-ip", TOK_SRCIP }, 252 { "dst-port", TOK_DSTPORT }, 253 { "src-port", TOK_SRCPORT }, 254 { "proto", TOK_PROTO }, 255 { "weight", TOK_WEIGHT }, 256 { "all", TOK_ALL }, 257 { "mask", TOK_MASK }, 258 { "droptail", TOK_DROPTAIL }, 259 { "red", TOK_RED }, 260 { "gred", TOK_GRED }, 261 { "bw", TOK_BW }, 262 { "bandwidth", TOK_BW }, 263 { "delay", TOK_DELAY }, 264 { "pipe", TOK_PIPE }, 265 { "queue", TOK_QUEUE }, 266 { "dummynet-params", TOK_NULL }, 267 { NULL, 0 } 268}; 269 270struct _s_x rule_actions[] = { 271 { "accept", TOK_ACCEPT }, 272 { "pass", TOK_ACCEPT }, 273 { "allow", TOK_ACCEPT }, 274 { "permit", TOK_ACCEPT }, 275 { "count", TOK_COUNT }, 276 { "pipe", TOK_PIPE }, 277 { "queue", TOK_QUEUE }, 278 { "divert", TOK_DIVERT }, 279 { "tee", TOK_TEE }, 280 { "fwd", TOK_FORWARD }, 281 { "forward", TOK_FORWARD }, 282 { "skipto", TOK_SKIPTO }, 283 { "deny", TOK_DENY }, 284 { "drop", TOK_DENY }, 285 { "reject", TOK_REJECT }, 286 { "reset", TOK_RESET }, 287 { "unreach", TOK_UNREACH }, 288 { "check-state", TOK_CHECKSTATE }, 289 { NULL, TOK_NULL }, 290 { NULL, 0 } 291}; 292 293struct _s_x rule_options[] = { 294 { "uid", TOK_UID }, 295 { "gid", TOK_GID }, 296 { "in", TOK_IN }, 297 { "limit", TOK_LIMIT }, 298 { "keep-state", TOK_KEEPSTATE }, 299 { "bridged", TOK_LAYER2 }, 300 { "layer2", TOK_LAYER2 }, 301 { "out", TOK_OUT }, 302 { "xmit", TOK_XMIT }, 303 { "recv", TOK_RECV }, 304 { "via", TOK_VIA }, 305 { "fragment", TOK_FRAG }, 306 { "frag", TOK_FRAG }, 307 { "ipoptions", TOK_IPOPTS }, 308 { "ipopts", TOK_IPOPTS }, 309 { "iplen", TOK_IPLEN }, 310 { "ipid", TOK_IPID }, 311 { "ipprecedence", TOK_IPPRECEDENCE }, 312 { "iptos", TOK_IPTOS }, 313 { "ipttl", TOK_IPTTL }, 314 { "ipversion", TOK_IPVER }, 315 { "ipver", TOK_IPVER }, 316 { "estab", TOK_ESTAB }, 317 { "established", TOK_ESTAB }, 318 { "setup", TOK_SETUP }, 319 { "tcpflags", TOK_TCPFLAGS }, 320 { "tcpflgs", TOK_TCPFLAGS }, 321 { "tcpoptions", TOK_TCPOPTS }, 322 { "tcpopts", TOK_TCPOPTS }, 323 { "tcpseq", TOK_TCPSEQ }, 324 { "tcpack", TOK_TCPACK }, 325 { "tcpwin", TOK_TCPWIN }, 326 { "icmptype", TOK_ICMPTYPES }, 327 { "icmptypes", TOK_ICMPTYPES }, 328 { "dst-ip", TOK_DSTIP }, 329 { "src-ip", TOK_SRCIP }, 330 { "dst-port", TOK_DSTPORT }, 331 { "src-port", TOK_SRCPORT }, 332 { "proto", TOK_PROTO }, 333 { "MAC", TOK_MAC }, 334 { "mac", TOK_MAC }, 335 { "mac-type", TOK_MACTYPE }, 336 337 { "not", TOK_NOT }, /* pseudo option */ 338 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 339 { "or", TOK_OR }, /* pseudo option */ 340 { "|", /* escape */ TOK_OR }, /* pseudo option */ 341 { "{", TOK_STARTBRACE }, /* pseudo option */ 342 { "(", TOK_STARTBRACE }, /* pseudo option */ 343 { "}", TOK_ENDBRACE }, /* pseudo option */ 344 { ")", TOK_ENDBRACE }, /* pseudo option */ 345 { NULL, TOK_NULL }, 346 { NULL, 0 } 347}; 348 349/** 350 * match_token takes a table and a string, returns the value associated 351 * with the string (0 meaning an error in most cases) 352 */ 353static int 354match_token(struct _s_x *table, char *string) 355{ 356 struct _s_x *pt; 357 int i = strlen(string); 358 359 for (pt = table ; i && pt->s != NULL ; pt++) 360 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 361 return pt->x; 362 return -1; 363}; 364 365static char * 366match_value(struct _s_x *p, u_int32_t value) 367{ 368 for (; p->s != NULL; p++) 369 if (p->x == value) 370 return p->s; 371 return NULL; 372} 373 374/* 375 * prints one port, symbolic or numeric 376 */ 377static void 378print_port(int proto, u_int16_t port) 379{ 380 381 if (proto == IPPROTO_ETHERTYPE) { 382 char *s; 383 384 if (do_resolv && (s = match_value(ether_types, port)) ) 385 printf("%s", s); 386 else 387 printf("0x%04x", port); 388 } else { 389 struct servent *se = NULL; 390 if (do_resolv) { 391 struct protoent *pe = getprotobynumber(proto); 392 393 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 394 } 395 if (se) 396 printf("%s", se->s_name); 397 else 398 printf("%d", port); 399 } 400} 401 402/* 403 * print the values in a list of ports 404 * XXX todo: add support for mask. 405 */ 406static void 407print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 408{ 409 u_int16_t *p = cmd->ports; 410 int i; 411 char *sep= " "; 412 413 if (cmd->o.len & F_NOT) 414 printf(" not"); 415 if (opcode != 0) 416 printf ("%s", opcode == O_MAC_TYPE ? " mac-type" : 417 (opcode == O_IP_DSTPORT ? " dst-port" : " src-port")); 418 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 419 printf(sep); 420 print_port(proto, p[0]); 421 if (p[0] != p[1]) { 422 printf("-"); 423 print_port(proto, p[1]); 424 } 425 sep = ","; 426 } 427} 428 429/* 430 * Like strtol, but also translates service names into port numbers 431 * for some protocols. 432 * In particular: 433 * proto == -1 disables the protocol check; 434 * proto == IPPROTO_ETHERTYPE looks up an internal table 435 * proto == <some value in /etc/protocols> matches the values there. 436 * Returns *end == s in case the parameter is not found. 437 */ 438static int 439strtoport(char *s, char **end, int base, int proto) 440{ 441 char *p, *buf; 442 char *s1; 443 int i; 444 445 *end = s; /* default - not found */ 446 if ( *s == '\0') 447 return 0; /* not found */ 448 449 if (isdigit(*s)) 450 return strtol(s, end, base); 451 452 /* 453 * find separator. '\\' escapes the next char. 454 */ 455 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 456 if (*s1 == '\\' && s1[1] != '\0') 457 s1++; 458 459 buf = malloc(s1 - s + 1); 460 if (buf == NULL) 461 return 0; 462 463 /* 464 * copy into a buffer skipping backslashes 465 */ 466 for (p = s, i = 0; p != s1 ; p++) 467 if ( *p != '\\') 468 buf[i++] = *p; 469 buf[i++] = '\0'; 470 471 if (proto == IPPROTO_ETHERTYPE) { 472 i = match_token(ether_types, buf); 473 free(buf); 474 if (i != -1) { /* found */ 475 *end = s1; 476 return i; 477 } 478 } else { 479 struct protoent *pe = NULL; 480 struct servent *se; 481 482 if (proto != 0) 483 pe = getprotobynumber(proto); 484 setservent(1); 485 se = getservbyname(buf, pe ? pe->p_name : NULL); 486 free(buf); 487 if (se != NULL) { 488 *end = s1; 489 return ntohs(se->s_port); 490 } 491 } 492 return 0; /* not found */ 493} 494 495/* 496 * fill the body of the command with the list of port ranges. 497 * At the moment it only understands numeric ranges. 498 */ 499static int 500fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 501{ 502 u_int16_t *p = cmd->ports; 503 int i = 0; 504 char *s = av; 505 506 while (*s) { 507 u_int16_t a, b; 508 509 a = strtoport(av, &s, 0, proto); 510 if (s == av) /* no parameter */ 511 break; 512 if (*s == '-') { /* a range */ 513 av = s+1; 514 b = strtoport(av, &s, 0, proto); 515 if (s == av) /* no parameter */ 516 break; 517 p[0] = a; 518 p[1] = b; 519 } else if (*s == ',' || *s == '\0' ) { 520 p[0] = p[1] = a; 521 } else { /* invalid separator */ 522 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 523 *s, av); 524 } 525 i++; 526 p += 2; 527 av = s+1; 528 } 529 if (i > 0) { 530 if (i+1 > F_LEN_MASK) 531 errx(EX_DATAERR, "too many ports/ranges\n"); 532 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 533 } 534 return i; 535} 536 537static struct _s_x icmpcodes[] = { 538 { "net", ICMP_UNREACH_NET }, 539 { "host", ICMP_UNREACH_HOST }, 540 { "protocol", ICMP_UNREACH_PROTOCOL }, 541 { "port", ICMP_UNREACH_PORT }, 542 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 543 { "srcfail", ICMP_UNREACH_SRCFAIL }, 544 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 545 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 546 { "isolated", ICMP_UNREACH_ISOLATED }, 547 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 548 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 549 { "tosnet", ICMP_UNREACH_TOSNET }, 550 { "toshost", ICMP_UNREACH_TOSHOST }, 551 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 552 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 553 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 554 { NULL, 0 } 555}; 556 557static void 558fill_reject_code(u_short *codep, char *str) 559{ 560 int val; 561 char *s; 562 563 val = strtoul(str, &s, 0); 564 if (s == str || *s != '\0' || val >= 0x100) 565 val = match_token(icmpcodes, str); 566 if (val < 0) 567 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 568 *codep = val; 569 return; 570} 571 572static void 573print_reject_code(u_int16_t code) 574{ 575 char *s = match_value(icmpcodes, code); 576 577 if (s != NULL) 578 printf("unreach %s", s); 579 else 580 printf("unreach %u", code); 581} 582 583/* 584 * Returns the number of bits set (from left) in a contiguous bitmask, 585 * or -1 if the mask is not contiguous. 586 * XXX this needs a proper fix. 587 * This effectively works on masks in big-endian (network) format. 588 * when compiled on little endian architectures. 589 * 590 * First bit is bit 7 of the first byte -- note, for MAC addresses, 591 * the first bit on the wire is bit 0 of the first byte. 592 * len is the max length in bits. 593 */ 594static int 595contigmask(u_char *p, int len) 596{ 597 int i, n; 598 for (i=0; i<len ; i++) 599 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 600 break; 601 for (n=i+1; n < len; n++) 602 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 603 return -1; /* mask not contiguous */ 604 return i; 605} 606 607/* 608 * print flags set/clear in the two bitmasks passed as parameters. 609 * There is a specialized check for f_tcpflags. 610 */ 611static void 612print_flags(char *name, ipfw_insn *cmd, struct _s_x *list) 613{ 614 char *comma=""; 615 int i; 616 u_char set = cmd->arg1 & 0xff; 617 u_char clear = (cmd->arg1 >> 8) & 0xff; 618 619 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 620 printf(" setup"); 621 return; 622 } 623 624 printf(" %s ", name); 625 for (i=0; list[i].x != 0; i++) { 626 if (set & list[i].x) { 627 set &= ~list[i].x; 628 printf("%s%s", comma, list[i].s); 629 comma = ","; 630 } 631 if (clear & list[i].x) { 632 clear &= ~list[i].x; 633 printf("%s!%s", comma, list[i].s); 634 comma = ","; 635 } 636 } 637} 638 639/* 640 * Print the ip address contained in a command. 641 */ 642static void 643print_ip(ipfw_insn_ip *cmd, char *s) 644{ 645 struct hostent *he = NULL; 646 int mb; 647 648 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 649 650 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 651 printf("me"); 652 return; 653 } 654 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 655 u_int32_t x, *d; 656 int i; 657 char comma = '{'; 658 659 x = cmd->o.arg1 - 1; 660 x = htonl( ~x ); 661 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 662 printf("%s/%d", inet_ntoa(cmd->addr), 663 contigmask((u_char *)&x, 32)); 664 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 665 x &= 0xff; /* base */ 666 d = (u_int32_t *)&(cmd->mask); 667 for (i=0; i < cmd->o.arg1; i++) 668 if (d[ i/32] & (1<<(i & 31))) { 669 printf("%c%d", comma, i+x); 670 comma = ','; 671 } 672 printf("}"); 673 return; 674 } 675 if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) 676 mb = 32; 677 else 678 mb = contigmask((u_char *)&(cmd->mask.s_addr), 32); 679 if (mb == 32 && do_resolv) 680 he = gethostbyaddr((char *)&(cmd->addr.s_addr), 681 sizeof(u_long), AF_INET); 682 if (he != NULL) /* resolved to name */ 683 printf("%s", he->h_name); 684 else if (mb == 0) /* any */ 685 printf("any"); 686 else { /* numeric IP followed by some kind of mask */ 687 printf("%s", inet_ntoa(cmd->addr)); 688 if (mb < 0) 689 printf(":%s", inet_ntoa(cmd->mask)); 690 else if (mb < 32) 691 printf("/%d", mb); 692 } 693} 694 695/* 696 * prints a MAC address/mask pair 697 */ 698static void 699print_mac(u_char *addr, u_char *mask) 700{ 701 int l = contigmask(mask, 48); 702 703 if (l == 0) 704 printf(" any"); 705 else { 706 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 707 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 708 if (l == -1) 709 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 710 mask[0], mask[1], mask[2], 711 mask[3], mask[4], mask[5]); 712 else if (l < 48) 713 printf("/%d", l); 714 } 715} 716 717static void 718fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 719{ 720 u_int8_t type; 721 722 cmd->d[0] = 0; 723 while (*av) { 724 if (*av == ',') 725 av++; 726 727 type = strtoul(av, &av, 0); 728 729 if (*av != ',' && *av != '\0') 730 errx(EX_DATAERR, "invalid ICMP type"); 731 732 if (type > 31) 733 errx(EX_DATAERR, "ICMP type out of range"); 734 735 cmd->d[0] |= 1 << type; 736 } 737 cmd->o.opcode = O_ICMPTYPE; 738 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 739} 740 741static void 742print_icmptypes(ipfw_insn_u32 *cmd) 743{ 744 int i; 745 char sep= ' '; 746 747 printf(" icmptypes"); 748 for (i = 0; i < 32; i++) { 749 if ( (cmd->d[0] & (1 << (i))) == 0) 750 continue; 751 printf("%c%d", sep, i); 752 sep = ','; 753 } 754} 755 756/* 757 * show_ipfw() prints the body of an ipfw rule. 758 * Because the standard rule has at least proto src_ip dst_ip, we use 759 * a helper function to produce these entries if not provided explicitly. 760 * The first argument is the list of fields we have, the second is 761 * the list of fields we want to be printed. 762 * 763 * Special cases if we have provided a MAC header: 764 * + if the rule does not contain IP addresses/ports, do not print them; 765 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 766 * 767 * Once we have 'have_options', IP header fields are printed as options. 768 */ 769#define HAVE_PROTO 0x0001 770#define HAVE_SRCIP 0x0002 771#define HAVE_DSTIP 0x0004 772#define HAVE_MAC 0x0008 773#define HAVE_MACTYPE 0x0010 774#define HAVE_OPTIONS 0x8000 775 776#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 777static void 778show_prerequisites(int *flags, int want, int cmd) 779{ 780 if ( (*flags & HAVE_IP) == HAVE_IP) 781 *flags |= HAVE_OPTIONS; 782 783 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 784 cmd != O_MAC_TYPE) { 785 /* 786 * mac-type was optimized out by the compiler, 787 * restore it 788 */ 789 printf(" any"); 790 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 791 return; 792 } 793 if ( !(*flags & HAVE_OPTIONS)) { 794 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 795 printf(" ip"); 796 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 797 printf(" from any"); 798 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 799 printf(" to any"); 800 } 801 *flags |= want; 802} 803 804static void 805show_ipfw(struct ip_fw *rule) 806{ 807 static int twidth = 0; 808 int l; 809 ipfw_insn *cmd; 810 int proto = 0; /* default */ 811 int flags = 0; /* prerequisites */ 812 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 813 int or_block = 0; /* we are in an or block */ 814 815 u_int32_t set_disable = rule->set_disable; 816 817 if (set_disable & (1 << rule->set)) { /* disabled */ 818 if (!show_sets) 819 return; 820 else 821 printf("# DISABLED "); 822 } 823 printf("%05u ", rule->rulenum); 824 825 if (do_acct) 826 printf("%10qu %10qu ", rule->pcnt, rule->bcnt); 827 828 if (do_time) { 829 char timestr[30]; 830 time_t t = (time_t)0; 831 832 if (twidth == 0) { 833 strcpy(timestr, ctime(&t)); 834 *strchr(timestr, '\n') = '\0'; 835 twidth = strlen(timestr); 836 } 837 if (rule->timestamp) { 838 t = _long_to_time(rule->timestamp); 839 840 strcpy(timestr, ctime(&t)); 841 *strchr(timestr, '\n') = '\0'; 842 printf("%s ", timestr); 843 } else { 844 printf("%*s", twidth, " "); 845 } 846 } 847 848 if (show_sets) 849 printf("set %d ", rule->set); 850 851 /* 852 * print the optional "match probability" 853 */ 854 if (rule->cmd_len > 0) { 855 cmd = rule->cmd ; 856 if (cmd->opcode == O_PROB) { 857 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 858 double d = 1.0 * p->d[0]; 859 860 d = (d / 0x7fffffff); 861 printf("prob %f ", d); 862 } 863 } 864 865 /* 866 * first print actions 867 */ 868 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 869 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 870 switch(cmd->opcode) { 871 case O_CHECK_STATE: 872 printf("check-state"); 873 flags = HAVE_IP; /* avoid printing anything else */ 874 break; 875 876 case O_ACCEPT: 877 printf("allow"); 878 break; 879 880 case O_COUNT: 881 printf("count"); 882 break; 883 884 case O_DENY: 885 printf("deny"); 886 break; 887 888 case O_REJECT: 889 if (cmd->arg1 == ICMP_REJECT_RST) 890 printf("reset"); 891 else if (cmd->arg1 == ICMP_UNREACH_HOST) 892 printf("reject"); 893 else 894 print_reject_code(cmd->arg1); 895 break; 896 897 case O_SKIPTO: 898 printf("skipto %u", cmd->arg1); 899 break; 900 901 case O_PIPE: 902 printf("pipe %u", cmd->arg1); 903 break; 904 905 case O_QUEUE: 906 printf("queue %u", cmd->arg1); 907 break; 908 909 case O_DIVERT: 910 printf("divert %u", cmd->arg1); 911 break; 912 913 case O_TEE: 914 printf("tee %u", cmd->arg1); 915 break; 916 917 case O_FORWARD_IP: 918 { 919 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 920 921 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 922 if (s->sa.sin_port) 923 printf(",%d", s->sa.sin_port); 924 } 925 break; 926 927 case O_LOG: /* O_LOG is printed last */ 928 logptr = (ipfw_insn_log *)cmd; 929 break; 930 931 default: 932 printf("** unrecognized action %d len %d", 933 cmd->opcode, cmd->len); 934 } 935 } 936 if (logptr) { 937 if (logptr->max_log > 0) 938 printf(" log logamount %d", logptr->max_log); 939 else 940 printf(" log"); 941 } 942 943 /* 944 * then print the body. 945 */ 946 if (rule->_pad & 1) { /* empty rules before options */ 947 if (!do_compact) 948 printf(" ip from any to any"); 949 flags |= HAVE_IP | HAVE_OPTIONS; 950 } 951 952 for (l = rule->act_ofs, cmd = rule->cmd ; 953 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 954 /* useful alias */ 955 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 956 957 show_prerequisites(&flags, 0, cmd->opcode); 958 959 switch(cmd->opcode) { 960 case O_PROB: 961 break; /* done already */ 962 963 case O_PROBE_STATE: 964 break; /* no need to print anything here */ 965 966 case O_MACADDR2: { 967 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 968 969 if ((cmd->len & F_OR) && !or_block) 970 printf(" {"); 971 if (cmd->len & F_NOT) 972 printf(" not"); 973 printf(" MAC"); 974 flags |= HAVE_MAC; 975 print_mac( m->addr, m->mask); 976 print_mac( m->addr + 6, m->mask + 6); 977 } 978 break; 979 980 case O_MAC_TYPE: 981 if ((cmd->len & F_OR) && !or_block) 982 printf(" {"); 983 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 984 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 985 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 986 break; 987 988 case O_IP_SRC: 989 case O_IP_SRC_MASK: 990 case O_IP_SRC_ME: 991 case O_IP_SRC_SET: 992 show_prerequisites(&flags, HAVE_PROTO, 0); 993 if (!(flags & HAVE_SRCIP)) 994 printf(" from"); 995 if ((cmd->len & F_OR) && !or_block) 996 printf(" {"); 997 print_ip((ipfw_insn_ip *)cmd, 998 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 999 flags |= HAVE_SRCIP; 1000 break; 1001 1002 case O_IP_DST: 1003 case O_IP_DST_MASK: 1004 case O_IP_DST_ME: 1005 case O_IP_DST_SET: 1006 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1007 if (!(flags & HAVE_DSTIP)) 1008 printf(" to"); 1009 if ((cmd->len & F_OR) && !or_block) 1010 printf(" {"); 1011 print_ip((ipfw_insn_ip *)cmd, 1012 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1013 flags |= HAVE_DSTIP; 1014 break; 1015 1016 case O_IP_DSTPORT: 1017 show_prerequisites(&flags, HAVE_IP, 0); 1018 case O_IP_SRCPORT: 1019 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1020 if ((cmd->len & F_OR) && !or_block) 1021 printf(" {"); 1022 print_newports((ipfw_insn_u16 *)cmd, proto, 1023 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1024 break; 1025 1026 case O_PROTO: { 1027 struct protoent *pe; 1028 1029 if ((cmd->len & F_OR) && !or_block) 1030 printf(" {"); 1031 if (cmd->len & F_NOT) 1032 printf(" not"); 1033 proto = cmd->arg1; 1034 pe = getprotobynumber(cmd->arg1); 1035 if (flags & HAVE_OPTIONS) 1036 printf(" proto"); 1037 if (pe) 1038 printf(" %s", pe->p_name); 1039 else 1040 printf(" %u", cmd->arg1); 1041 } 1042 flags |= HAVE_PROTO; 1043 break; 1044 1045 default: /*options ... */ 1046 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1047 if ((cmd->len & F_OR) && !or_block) 1048 printf(" {"); 1049 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1050 printf(" not"); 1051 switch(cmd->opcode) { 1052 case O_FRAG: 1053 printf(" frag"); 1054 break; 1055 1056 case O_IN: 1057 printf(cmd->len & F_NOT ? " out" : " in"); 1058 break; 1059 1060 case O_LAYER2: 1061 printf(" layer2"); 1062 break; 1063 case O_XMIT: 1064 case O_RECV: 1065 case O_VIA: { 1066 char *s; 1067 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1068 1069 if (cmd->opcode == O_XMIT) 1070 s = "xmit"; 1071 else if (cmd->opcode == O_RECV) 1072 s = "recv"; 1073 else if (cmd->opcode == O_VIA) 1074 s = "via"; 1075 if (cmdif->name[0] == '\0') 1076 printf(" %s %s", s, 1077 inet_ntoa(cmdif->p.ip)); 1078 else if (cmdif->p.unit == -1) 1079 printf(" %s %s*", s, cmdif->name); 1080 else 1081 printf(" %s %s%d", s, cmdif->name, 1082 cmdif->p.unit); 1083 } 1084 break; 1085 1086 case O_IPID: 1087 printf(" ipid %u", cmd->arg1 ); 1088 break; 1089 1090 case O_IPTTL: 1091 printf(" ipttl %u", cmd->arg1 ); 1092 break; 1093 1094 case O_IPVER: 1095 printf(" ipver %u", cmd->arg1 ); 1096 break; 1097 1098 case O_IPPRECEDENCE: 1099 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1100 break; 1101 1102 case O_IPLEN: 1103 printf(" iplen %u", cmd->arg1 ); 1104 break; 1105 1106 case O_IPOPT: 1107 print_flags("ipoptions", cmd, f_ipopts); 1108 break; 1109 1110 case O_IPTOS: 1111 print_flags("iptos", cmd, f_iptos); 1112 break; 1113 1114 case O_ICMPTYPE: 1115 print_icmptypes((ipfw_insn_u32 *)cmd); 1116 break; 1117 1118 case O_ESTAB: 1119 printf(" established"); 1120 break; 1121 1122 case O_TCPFLAGS: 1123 print_flags("tcpflags", cmd, f_tcpflags); 1124 break; 1125 1126 case O_TCPOPTS: 1127 print_flags("tcpoptions", cmd, f_tcpopts); 1128 break; 1129 1130 case O_TCPWIN: 1131 printf(" tcpwin %d", ntohs(cmd->arg1)); 1132 break; 1133 1134 case O_TCPACK: 1135 printf(" tcpack %d", ntohl(cmd32->d[0])); 1136 break; 1137 1138 case O_TCPSEQ: 1139 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1140 break; 1141 1142 case O_UID: 1143 { 1144 struct passwd *pwd = getpwuid(cmd32->d[0]); 1145 1146 if (pwd) 1147 printf(" uid %s", pwd->pw_name); 1148 else 1149 printf(" uid %u", cmd32->d[0]); 1150 } 1151 break; 1152 1153 case O_GID: 1154 { 1155 struct group *grp = getgrgid(cmd32->d[0]); 1156 1157 if (grp) 1158 printf(" gid %s", grp->gr_name); 1159 else 1160 printf(" gid %u", cmd32->d[0]); 1161 } 1162 break; 1163 1164 case O_KEEP_STATE: 1165 printf(" keep-state"); 1166 break; 1167 1168 case O_LIMIT: 1169 { 1170 struct _s_x *p = limit_masks; 1171 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1172 u_int8_t x = c->limit_mask; 1173 char *comma = " "; 1174 1175 printf(" limit"); 1176 for ( ; p->x != 0 ; p++) 1177 if ((x & p->x) == p->x) { 1178 x &= ~p->x; 1179 printf("%s%s", comma, p->s); 1180 comma = ","; 1181 } 1182 printf(" %d", c->conn_limit); 1183 } 1184 break; 1185 1186 default: 1187 printf(" [opcode %d len %d]", 1188 cmd->opcode, cmd->len); 1189 } 1190 } 1191 if (cmd->len & F_OR) { 1192 printf(" or"); 1193 or_block = 1; 1194 } else if (or_block) { 1195 printf(" }"); 1196 or_block = 0; 1197 } 1198 } 1199 show_prerequisites(&flags, HAVE_IP, 0); 1200 1201 printf("\n"); 1202} 1203 1204static void 1205show_dyn_ipfw(ipfw_dyn_rule *d) 1206{ 1207 struct protoent *pe; 1208 struct in_addr a; 1209 1210 if (!do_expired) { 1211 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1212 return; 1213 } 1214 1215 printf("%05d %10qu %10qu (%ds)", 1216 d->rulenum, d->pcnt, d->bcnt, d->expire); 1217 switch (d->dyn_type) { 1218 case O_LIMIT_PARENT: 1219 printf(" PARENT %d", d->count); 1220 break; 1221 case O_LIMIT: 1222 printf(" LIMIT"); 1223 break; 1224 case O_KEEP_STATE: /* bidir, no mask */ 1225 printf(" STATE"); 1226 break; 1227 } 1228 1229 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1230 printf(" %s", pe->p_name); 1231 else 1232 printf(" proto %u", d->id.proto); 1233 1234 a.s_addr = htonl(d->id.src_ip); 1235 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1236 1237 a.s_addr = htonl(d->id.dst_ip); 1238 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1239 printf("\n"); 1240} 1241 1242int 1243sort_q(const void *pa, const void *pb) 1244{ 1245 int rev = (do_sort < 0); 1246 int field = rev ? -do_sort : do_sort; 1247 long long res = 0; 1248 const struct dn_flow_queue *a = pa; 1249 const struct dn_flow_queue *b = pb; 1250 1251 switch (field) { 1252 case 1: /* pkts */ 1253 res = a->len - b->len; 1254 break; 1255 case 2: /* bytes */ 1256 res = a->len_bytes - b->len_bytes; 1257 break; 1258 1259 case 3: /* tot pkts */ 1260 res = a->tot_pkts - b->tot_pkts; 1261 break; 1262 1263 case 4: /* tot bytes */ 1264 res = a->tot_bytes - b->tot_bytes; 1265 break; 1266 } 1267 if (res < 0) 1268 res = -1; 1269 if (res > 0) 1270 res = 1; 1271 return (int)(rev ? res : -res); 1272} 1273 1274static void 1275list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1276{ 1277 int l; 1278 1279 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1280 fs->flow_mask.proto, 1281 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1282 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1283 if (fs->rq_elements == 0) 1284 return; 1285 1286 printf("BKT Prot ___Source IP/port____ " 1287 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1288 if (do_sort != 0) 1289 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1290 for (l = 0; l < fs->rq_elements; l++) { 1291 struct in_addr ina; 1292 struct protoent *pe; 1293 1294 ina.s_addr = htonl(q[l].id.src_ip); 1295 printf("%3d ", q[l].hash_slot); 1296 pe = getprotobynumber(q[l].id.proto); 1297 if (pe) 1298 printf("%-4s ", pe->p_name); 1299 else 1300 printf("%4u ", q[l].id.proto); 1301 printf("%15s/%-5d ", 1302 inet_ntoa(ina), q[l].id.src_port); 1303 ina.s_addr = htonl(q[l].id.dst_ip); 1304 printf("%15s/%-5d ", 1305 inet_ntoa(ina), q[l].id.dst_port); 1306 printf("%4qu %8qu %2u %4u %3u\n", 1307 q[l].tot_pkts, q[l].tot_bytes, 1308 q[l].len, q[l].len_bytes, q[l].drops); 1309 if (verbose) 1310 printf(" S %20qd F %20qd\n", 1311 q[l].S, q[l].F); 1312 } 1313} 1314 1315static void 1316print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1317{ 1318 int l; 1319 char qs[30]; 1320 char plr[30]; 1321 char red[90]; /* Display RED parameters */ 1322 1323 l = fs->qsize; 1324 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1325 if (l >= 8192) 1326 sprintf(qs, "%d KB", l / 1024); 1327 else 1328 sprintf(qs, "%d B", l); 1329 } else 1330 sprintf(qs, "%3d sl.", l); 1331 if (fs->plr) 1332 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1333 else 1334 plr[0] = '\0'; 1335 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1336 sprintf(red, 1337 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1338 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1339 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1340 SCALE_VAL(fs->min_th), 1341 SCALE_VAL(fs->max_th), 1342 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1343 else 1344 sprintf(red, "droptail"); 1345 1346 printf("%s %s%s %d queues (%d buckets) %s\n", 1347 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1348} 1349 1350static void 1351list_pipes(void *data, int nbytes, int ac, char *av[]) 1352{ 1353 u_long rulenum; 1354 void *next = data; 1355 struct dn_pipe *p = (struct dn_pipe *) data; 1356 struct dn_flow_set *fs; 1357 struct dn_flow_queue *q; 1358 int l; 1359 1360 if (ac > 0) 1361 rulenum = strtoul(*av++, NULL, 10); 1362 else 1363 rulenum = 0; 1364 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1365 double b = p->bandwidth; 1366 char buf[30]; 1367 char prefix[80]; 1368 1369 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1370 break; /* done with pipes, now queues */ 1371 1372 /* 1373 * compute length, as pipe have variable size 1374 */ 1375 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1376 next = (void *)p + l; 1377 nbytes -= l; 1378 1379 if (rulenum != 0 && rulenum != p->pipe_nr) 1380 continue; 1381 1382 /* 1383 * Print rate (or clocking interface) 1384 */ 1385 if (p->if_name[0] != '\0') 1386 sprintf(buf, "%s", p->if_name); 1387 else if (b == 0) 1388 sprintf(buf, "unlimited"); 1389 else if (b >= 1000000) 1390 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1391 else if (b >= 1000) 1392 sprintf(buf, "%7.3f Kbit/s", b/1000); 1393 else 1394 sprintf(buf, "%7.3f bit/s ", b); 1395 1396 sprintf(prefix, "%05d: %s %4d ms ", 1397 p->pipe_nr, buf, p->delay); 1398 print_flowset_parms(&(p->fs), prefix); 1399 if (verbose) 1400 printf(" V %20qd\n", p->V >> MY_M); 1401 1402 q = (struct dn_flow_queue *)(p+1); 1403 list_queues(&(p->fs), q); 1404 } 1405 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1406 char prefix[80]; 1407 1408 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1409 break; 1410 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1411 next = (void *)fs + l; 1412 nbytes -= l; 1413 q = (struct dn_flow_queue *)(fs+1); 1414 sprintf(prefix, "q%05d: weight %d pipe %d ", 1415 fs->fs_nr, fs->weight, fs->parent_nr); 1416 print_flowset_parms(fs, prefix); 1417 list_queues(fs, q); 1418 } 1419} 1420 1421/* 1422 * This one handles all set-related commands 1423 * ipfw set { show | enable | disable } 1424 * ipfw set swap X Y 1425 * ipfw set move X to Y 1426 * ipfw set move rule X to Y 1427 */ 1428static void 1429sets_handler(int ac, char *av[]) 1430{ 1431 u_int32_t set_disable, masks[2]; 1432 int i, nbytes; 1433 u_int16_t rulenum; 1434 u_int8_t cmd, new_set; 1435 1436 ac--; 1437 av++; 1438 1439 if (!ac) 1440 errx(EX_USAGE, "set needs command"); 1441 if (!strncmp(*av, "show", strlen(*av)) ) { 1442 void *data; 1443 char *msg; 1444 1445 nbytes = sizeof(struct ip_fw); 1446 if ((data = malloc(nbytes)) == NULL) 1447 err(EX_OSERR, "malloc"); 1448 if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0) 1449 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1450 set_disable = ((struct ip_fw *)data)->set_disable; 1451 1452 for (i = 0, msg = "disable" ; i < 31; i++) 1453 if ( (set_disable & (1<<i))) { 1454 printf("%s %d", msg, i); 1455 msg = ""; 1456 } 1457 msg = (set_disable) ? " enable" : "enable"; 1458 for (i = 0; i < 31; i++) 1459 if ( !(set_disable & (1<<i))) { 1460 printf("%s %d", msg, i); 1461 msg = ""; 1462 } 1463 printf("\n"); 1464 } else if (!strncmp(*av, "swap", strlen(*av))) { 1465 ac--; av++; 1466 if (ac != 2) 1467 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1468 rulenum = atoi(av[0]); 1469 new_set = atoi(av[1]); 1470 if (!isdigit(*(av[0])) || rulenum > 30) 1471 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1472 if (!isdigit(*(av[1])) || new_set > 30) 1473 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1474 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1475 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, 1476 masks, sizeof(u_int32_t)); 1477 } else if (!strncmp(*av, "move", strlen(*av))) { 1478 ac--; av++; 1479 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1480 cmd = 2; 1481 ac--; av++; 1482 } else 1483 cmd = 3; 1484 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1485 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1486 rulenum = atoi(av[0]); 1487 new_set = atoi(av[2]); 1488 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) || 1489 (cmd == 2 && rulenum == 65535) ) 1490 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1491 if (!isdigit(*(av[2])) || new_set > 30) 1492 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1493 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1494 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, 1495 masks, sizeof(u_int32_t)); 1496 } else if (!strncmp(*av, "disable", strlen(*av)) || 1497 !strncmp(*av, "enable", strlen(*av)) ) { 1498 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1499 1500 ac--; av++; 1501 masks[0] = masks[1] = 0; 1502 1503 while (ac) { 1504 if (isdigit(**av)) { 1505 i = atoi(*av); 1506 if (i < 0 || i > 30) 1507 errx(EX_DATAERR, 1508 "invalid set number %d\n", i); 1509 masks[which] |= (1<<i); 1510 } else if (!strncmp(*av, "disable", strlen(*av))) 1511 which = 0; 1512 else if (!strncmp(*av, "enable", strlen(*av))) 1513 which = 1; 1514 else 1515 errx(EX_DATAERR, 1516 "invalid set command %s\n", *av); 1517 av++; ac--; 1518 } 1519 if ( (masks[0] & masks[1]) != 0 ) 1520 errx(EX_DATAERR, 1521 "cannot enable and disable the same set\n"); 1522 1523 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks)); 1524 if (i) 1525 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1526 } else 1527 errx(EX_USAGE, "invalid set command %s\n", *av); 1528} 1529 1530static void 1531list(int ac, char *av[]) 1532{ 1533 struct ip_fw *r; 1534 ipfw_dyn_rule *dynrules, *d; 1535 1536 void *lim, *data = NULL; 1537 int n, nbytes, nstat, ndyn; 1538 int exitval = EX_OK; 1539 int lac; 1540 char **lav; 1541 u_long rnum; 1542 char *endptr; 1543 int seen = 0; 1544 1545 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1546 int nalloc = 1024; /* start somewhere... */ 1547 1548 ac--; 1549 av++; 1550 1551 /* get rules or pipes from kernel, resizing array as necessary */ 1552 nbytes = nalloc; 1553 1554 while (nbytes >= nalloc) { 1555 nalloc = nalloc * 2 + 200; 1556 nbytes = nalloc; 1557 if ((data = realloc(data, nbytes)) == NULL) 1558 err(EX_OSERR, "realloc"); 1559 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0) 1560 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1561 do_pipe ? "DUMMYNET" : "FW"); 1562 } 1563 1564 if (do_pipe) { 1565 list_pipes(data, nbytes, ac, av); 1566 goto done; 1567 } 1568 1569 /* 1570 * Count static rules. They have variable size so we 1571 * need to scan the list to count them. 1572 */ 1573 for (nstat = 1, r = data, lim = data + nbytes; 1574 r->rulenum < 65535 && (void *)r < lim; 1575 ++nstat, r = (void *)r + RULESIZE(r) ) 1576 ; /* nothing */ 1577 1578 /* 1579 * Count dynamic rules. This is easier as they have 1580 * fixed size. 1581 */ 1582 r = (void *)r + RULESIZE(r); 1583 dynrules = (ipfw_dyn_rule *)r ; 1584 n = (void *)r - data; 1585 ndyn = (nbytes - n) / sizeof *dynrules; 1586 1587 /* if no rule numbers were specified, list all rules */ 1588 if (ac == 0) { 1589 for (n = 0, r = data; n < nstat; 1590 n++, r = (void *)r + RULESIZE(r) ) 1591 show_ipfw(r); 1592 1593 if (do_dynamic && ndyn) { 1594 printf("## Dynamic rules (%d):\n", ndyn); 1595 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1596 show_dyn_ipfw(d); 1597 } 1598 goto done; 1599 } 1600 1601 /* display specific rules requested on command line */ 1602 1603 for (lac = ac, lav = av; lac != 0; lac--) { 1604 /* convert command line rule # */ 1605 rnum = strtoul(*lav++, &endptr, 10); 1606 if (*endptr) { 1607 exitval = EX_USAGE; 1608 warnx("invalid rule number: %s", *(lav - 1)); 1609 continue; 1610 } 1611 for (n = seen = 0, r = data; n < nstat; 1612 n++, r = (void *)r + RULESIZE(r) ) { 1613 if (r->rulenum > rnum) 1614 break; 1615 if (r->rulenum == rnum) { 1616 show_ipfw(r); 1617 seen = 1; 1618 } 1619 } 1620 if (!seen) { 1621 /* give precedence to other error(s) */ 1622 if (exitval == EX_OK) 1623 exitval = EX_UNAVAILABLE; 1624 warnx("rule %lu does not exist", rnum); 1625 } 1626 } 1627 1628 if (do_dynamic && ndyn) { 1629 printf("## Dynamic rules:\n"); 1630 for (lac = ac, lav = av; lac != 0; lac--) { 1631 rnum = strtoul(*lav++, &endptr, 10); 1632 if (*endptr) 1633 /* already warned */ 1634 continue; 1635 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1636 if (d->rulenum > rnum) 1637 break; 1638 if (d->rulenum == rnum) 1639 show_dyn_ipfw(d); 1640 } 1641 } 1642 } 1643 1644 ac = 0; 1645 1646done: 1647 free(data); 1648 1649 if (exitval != EX_OK) 1650 exit(exitval); 1651} 1652 1653static void 1654show_usage(void) 1655{ 1656 fprintf(stderr, "usage: ipfw [options]\n" 1657" add [number] rule\n" 1658" pipe number config [pipeconfig]\n" 1659" queue number config [queueconfig]\n" 1660" [pipe] flush\n" 1661" [pipe] delete number ...\n" 1662" [pipe] {list|show} [number ...]\n" 1663" {zero|resetlog} [number ...]\n" 1664"do \"ipfw -h\" or see ipfw manpage for details\n" 1665); 1666 1667 exit(EX_USAGE); 1668} 1669 1670static void 1671help(void) 1672{ 1673 1674 fprintf(stderr, "ipfw syntax summary:\n" 1675"ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n" 1676"ipfw {pipe|queue} N config BODY\n" 1677"ipfw [pipe] {zero|delete|show} [N{,N}]\n" 1678"\n" 1679"RULE: [1..] [PROB] BODY\n" 1680"RULENUM: INTEGER(1..65534)\n" 1681"PROB: prob REAL(0..1)\n" 1682"BODY: check-state [LOG] (no body) |\n" 1683" ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n" 1684"ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1685" {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1686"ADDR: [ MAC dst src ether_type ] \n" 1687" [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n" 1688"IPLIST: IPADDR | ( IPADDR or ... or IPADDR )\n" 1689"IPADDR: [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n" 1690"OPTION_LIST: OPTION [,OPTION_LIST]\n" 1691); 1692exit(0); 1693} 1694 1695 1696static int 1697lookup_host (char *host, struct in_addr *ipaddr) 1698{ 1699 struct hostent *he; 1700 1701 if (!inet_aton(host, ipaddr)) { 1702 if ((he = gethostbyname(host)) == NULL) 1703 return(-1); 1704 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1705 } 1706 return(0); 1707} 1708 1709/* 1710 * fills the addr and mask fields in the instruction as appropriate from av. 1711 * Update length as appropriate. 1712 * The following formats are allowed: 1713 * any matches any IP. Actually returns an empty instruction. 1714 * me returns O_IP_*_ME 1715 * 1.2.3.4 single IP address 1716 * 1.2.3.4:5.6.7.8 address:mask 1717 * 1.2.3.4/24 address/mask 1718 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1719 */ 1720static void 1721fill_ip(ipfw_insn_ip *cmd, char *av) 1722{ 1723 char *p = 0, md = 0; 1724 u_int32_t i; 1725 1726 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1727 1728 if (!strncmp(av, "any", strlen(av))) 1729 return; 1730 1731 if (!strncmp(av, "me", strlen(av))) { 1732 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1733 return; 1734 } 1735 1736 p = strchr(av, '/'); 1737 if (!p) 1738 p = strchr(av, ':'); 1739 if (p) { 1740 md = *p; 1741 *p++ = '\0'; 1742 } 1743 1744 if (lookup_host(av, &cmd->addr) != 0) 1745 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1746 switch (md) { 1747 case ':': 1748 if (!inet_aton(p, &cmd->mask)) 1749 errx(EX_DATAERR, "bad netmask ``%s''", p); 1750 break; 1751 case '/': 1752 i = atoi(p); 1753 if (i == 0) 1754 cmd->mask.s_addr = htonl(0); 1755 else if (i > 32) 1756 errx(EX_DATAERR, "bad width ``%s''", p); 1757 else 1758 cmd->mask.s_addr = htonl(~0 << (32 - i)); 1759 break; 1760 default: 1761 cmd->mask.s_addr = htonl(~0); 1762 break; 1763 } 1764 cmd->addr.s_addr &= cmd->mask.s_addr; 1765 /* 1766 * now look if we have a set of addresses. They are stored as follows: 1767 * arg1 is the set size (powers of 2, 2..256) 1768 * addr is the base address IN HOST FORMAT 1769 * mask.. is an array of u_int32_t with bits set. 1770 */ 1771 if (p) 1772 p = strchr(p, '{'); 1773 if (p) { /* fetch addresses */ 1774 u_int32_t *d; 1775 int low, high; 1776 int i = contigmask((u_char *)&(cmd->mask), 32); 1777 1778 if (i < 24 || i > 31) { 1779 fprintf(stderr, "invalid set with mask %d\n", 1780 i); 1781 exit(0); 1782 } 1783 cmd->o.arg1 = 1<<(32-i); 1784 cmd->addr.s_addr = ntohl(cmd->addr.s_addr); 1785 d = (u_int32_t *)&cmd->mask; 1786 cmd->o.opcode = O_IP_DST_SET; /* default */ 1787 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 1788 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 1789 d[i] = 0; /* clear masks */ 1790 1791 av = p+1; 1792 low = cmd->addr.s_addr & 0xff; 1793 high = low + cmd->o.arg1 - 1; 1794 while (isdigit(*av)) { 1795 char *s; 1796 u_int16_t a = strtol(av, &s, 0); 1797 1798 if (s == av) /* no parameter */ 1799 break; 1800 if (a < low || a > high) { 1801 fprintf(stderr, "addr %d out of range [%d-%d]\n", 1802 a, low, high); 1803 exit(0); 1804 } 1805 a -= low; 1806 d[ a/32] |= 1<<(a & 31); 1807 if (*s != ',') 1808 break; 1809 av = s+1; 1810 } 1811 return; 1812 } 1813 1814 if (cmd->mask.s_addr == 0) { /* any */ 1815 if (cmd->o.len & F_NOT) 1816 errx(EX_DATAERR, "not any never matches"); 1817 else /* useless, nuke it */ 1818 return; 1819 } else if (cmd->mask.s_addr == IP_MASK_ALL) /* one IP */ 1820 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1821 else /* addr/mask */ 1822 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip); 1823} 1824 1825 1826/* 1827 * helper function to process a set of flags and set bits in the 1828 * appropriate masks. 1829 */ 1830static void 1831fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 1832 struct _s_x *flags, char *p) 1833{ 1834 u_int8_t set=0, clear=0; 1835 1836 while (p && *p) { 1837 char *q; /* points to the separator */ 1838 int val; 1839 u_int8_t *which; /* mask we are working on */ 1840 1841 if (*p == '!') { 1842 p++; 1843 which = &clear; 1844 } else 1845 which = &set; 1846 q = strchr(p, ','); 1847 if (q) 1848 *q++ = '\0'; 1849 val = match_token(flags, p); 1850 if (val <= 0) 1851 errx(EX_DATAERR, "invalid flag %s", p); 1852 *which |= (u_int8_t)val; 1853 p = q; 1854 } 1855 cmd->opcode = opcode; 1856 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 1857 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 1858} 1859 1860 1861static void 1862delete(int ac, char *av[]) 1863{ 1864 u_int32_t rulenum; 1865 struct dn_pipe pipe; 1866 int i; 1867 int exitval = EX_OK; 1868 int do_set = 0; 1869 1870 memset(&pipe, 0, sizeof pipe); 1871 1872 av++; ac--; 1873 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 1874 do_set = 1; /* delete set */ 1875 ac--; av++; 1876 } 1877 1878 /* Rule number */ 1879 while (ac && isdigit(**av)) { 1880 i = atoi(*av); av++; ac--; 1881 if (do_pipe) { 1882 if (do_pipe == 1) 1883 pipe.pipe_nr = i; 1884 else 1885 pipe.fs.fs_nr = i; 1886 i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL, 1887 &pipe, sizeof pipe); 1888 if (i) { 1889 exitval = 1; 1890 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 1891 do_pipe == 1 ? pipe.pipe_nr : 1892 pipe.fs.fs_nr); 1893 } 1894 } else { 1895 rulenum = (i & 0xffff) | (do_set << 24); 1896 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum, 1897 sizeof rulenum); 1898 if (i) { 1899 exitval = EX_UNAVAILABLE; 1900 warn("rule %u: setsockopt(IP_FW_DEL)", 1901 rulenum); 1902 } 1903 } 1904 } 1905 if (exitval != EX_OK) 1906 exit(exitval); 1907} 1908 1909 1910/* 1911 * fill the interface structure. We do not check the name as we can 1912 * create interfaces dynamically, so checking them at insert time 1913 * makes relatively little sense. 1914 * A '*' following the name means any unit. 1915 */ 1916static void 1917fill_iface(ipfw_insn_if *cmd, char *arg) 1918{ 1919 cmd->name[0] = '\0'; 1920 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 1921 1922 /* Parse the interface or address */ 1923 if (!strcmp(arg, "any")) 1924 cmd->o.len = 0; /* effectively ignore this command */ 1925 else if (!isdigit(*arg)) { 1926 char *q; 1927 1928 strncpy(cmd->name, arg, sizeof(cmd->name)); 1929 cmd->name[sizeof(cmd->name) - 1] = '\0'; 1930 /* find first digit or wildcard */ 1931 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++) 1932 continue; 1933 cmd->p.unit = (*q == '*') ? -1 : atoi(q); 1934 *q = '\0'; 1935 } else if (!inet_aton(arg, &cmd->p.ip)) 1936 errx(EX_DATAERR, "bad ip address ``%s''", arg); 1937} 1938 1939/* 1940 * the following macro returns an error message if we run out of 1941 * arguments. 1942 */ 1943#define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 1944 1945static void 1946config_pipe(int ac, char **av) 1947{ 1948 struct dn_pipe pipe; 1949 int i; 1950 char *end; 1951 u_int32_t a; 1952 void *par = NULL; 1953 1954 memset(&pipe, 0, sizeof pipe); 1955 1956 av++; ac--; 1957 /* Pipe number */ 1958 if (ac && isdigit(**av)) { 1959 i = atoi(*av); av++; ac--; 1960 if (do_pipe == 1) 1961 pipe.pipe_nr = i; 1962 else 1963 pipe.fs.fs_nr = i; 1964 } 1965 while (ac > 0) { 1966 double d; 1967 int tok = match_token(dummynet_params, *av); 1968 ac--; av++; 1969 1970 switch(tok) { 1971 case TOK_NOERROR: 1972 pipe.fs.flags_fs |= DN_NOERROR; 1973 break; 1974 1975 case TOK_PLR: 1976 NEED1("plr needs argument 0..1\n"); 1977 d = strtod(av[0], NULL); 1978 if (d > 1) 1979 d = 1; 1980 else if (d < 0) 1981 d = 0; 1982 pipe.fs.plr = (int)(d*0x7fffffff); 1983 ac--; av++; 1984 break; 1985 1986 case TOK_QUEUE: 1987 NEED1("queue needs queue size\n"); 1988 end = NULL; 1989 pipe.fs.qsize = strtoul(av[0], &end, 0); 1990 if (*end == 'K' || *end == 'k') { 1991 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES; 1992 pipe.fs.qsize *= 1024; 1993 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 1994 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES; 1995 } 1996 ac--; av++; 1997 break; 1998 1999 case TOK_BUCKETS: 2000 NEED1("buckets needs argument\n"); 2001 pipe.fs.rq_size = strtoul(av[0], NULL, 0); 2002 ac--; av++; 2003 break; 2004 2005 case TOK_MASK: 2006 NEED1("mask needs mask specifier\n"); 2007 /* 2008 * per-flow queue, mask is dst_ip, dst_port, 2009 * src_ip, src_port, proto measured in bits 2010 */ 2011 par = NULL; 2012 2013 pipe.fs.flow_mask.dst_ip = 0; 2014 pipe.fs.flow_mask.src_ip = 0; 2015 pipe.fs.flow_mask.dst_port = 0; 2016 pipe.fs.flow_mask.src_port = 0; 2017 pipe.fs.flow_mask.proto = 0; 2018 end = NULL; 2019 2020 while (ac >= 1) { 2021 u_int32_t *p32 = NULL; 2022 u_int16_t *p16 = NULL; 2023 2024 tok = match_token(dummynet_params, *av); 2025 ac--; av++; 2026 switch(tok) { 2027 case TOK_ALL: 2028 /* 2029 * special case, all bits significant 2030 */ 2031 pipe.fs.flow_mask.dst_ip = ~0; 2032 pipe.fs.flow_mask.src_ip = ~0; 2033 pipe.fs.flow_mask.dst_port = ~0; 2034 pipe.fs.flow_mask.src_port = ~0; 2035 pipe.fs.flow_mask.proto = ~0; 2036 pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2037 goto end_mask; 2038 2039 case TOK_DSTIP: 2040 p32 = &pipe.fs.flow_mask.dst_ip; 2041 break; 2042 2043 case TOK_SRCIP: 2044 p32 = &pipe.fs.flow_mask.src_ip; 2045 break; 2046 2047 case TOK_DSTPORT: 2048 p16 = &pipe.fs.flow_mask.dst_port; 2049 break; 2050 2051 case TOK_SRCPORT: 2052 p16 = &pipe.fs.flow_mask.src_port; 2053 break; 2054 2055 case TOK_PROTO: 2056 break; 2057 2058 default: 2059 ac++; av--; /* backtrack */ 2060 goto end_mask; 2061 } 2062 if (ac < 1) 2063 errx(EX_USAGE, "mask: value missing"); 2064 if (*av[0] == '/') { 2065 a = strtoul(av[0]+1, &end, 0); 2066 a = (a == 32) ? ~0 : (1 << a) - 1; 2067 } else 2068 a = strtoul(av[0], &end, 0); 2069 if (p32 != NULL) 2070 *p32 = a; 2071 else if (p16 != NULL) { 2072 if (a > 65535) 2073 errx(EX_DATAERR, 2074 "mask: must be 16 bit"); 2075 *p16 = (u_int16_t)a; 2076 } else { 2077 if (a > 255) 2078 errx(EX_DATAERR, 2079 "mask: must be 8 bit"); 2080 pipe.fs.flow_mask.proto = (u_int8_t)a; 2081 } 2082 if (a != 0) 2083 pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2084 ac--; av++; 2085 } /* end while, config masks */ 2086end_mask: 2087 break; 2088 2089 case TOK_RED: 2090 case TOK_GRED: 2091 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2092 pipe.fs.flags_fs |= DN_IS_RED; 2093 if (tok == TOK_GRED) 2094 pipe.fs.flags_fs |= DN_IS_GENTLE_RED; 2095 /* 2096 * the format for parameters is w_q/min_th/max_th/max_p 2097 */ 2098 if ((end = strsep(&av[0], "/"))) { 2099 double w_q = strtod(end, NULL); 2100 if (w_q > 1 || w_q <= 0) 2101 errx(EX_DATAERR, "0 < w_q <= 1"); 2102 pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2103 } 2104 if ((end = strsep(&av[0], "/"))) { 2105 pipe.fs.min_th = strtoul(end, &end, 0); 2106 if (*end == 'K' || *end == 'k') 2107 pipe.fs.min_th *= 1024; 2108 } 2109 if ((end = strsep(&av[0], "/"))) { 2110 pipe.fs.max_th = strtoul(end, &end, 0); 2111 if (*end == 'K' || *end == 'k') 2112 pipe.fs.max_th *= 1024; 2113 } 2114 if ((end = strsep(&av[0], "/"))) { 2115 double max_p = strtod(end, NULL); 2116 if (max_p > 1 || max_p <= 0) 2117 errx(EX_DATAERR, "0 < max_p <= 1"); 2118 pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2119 } 2120 ac--; av++; 2121 break; 2122 2123 case TOK_DROPTAIL: 2124 pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2125 break; 2126 2127 case TOK_BW: 2128 NEED1("bw needs bandwidth or interface\n"); 2129 if (do_pipe != 1) 2130 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2131 /* 2132 * set clocking interface or bandwidth value 2133 */ 2134 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2135 int l = sizeof(pipe.if_name)-1; 2136 /* interface name */ 2137 strncpy(pipe.if_name, av[0], l); 2138 pipe.if_name[l] = '\0'; 2139 pipe.bandwidth = 0; 2140 } else { 2141 pipe.if_name[0] = '\0'; 2142 pipe.bandwidth = strtoul(av[0], &end, 0); 2143 if (*end == 'K' || *end == 'k') { 2144 end++; 2145 pipe.bandwidth *= 1000; 2146 } else if (*end == 'M') { 2147 end++; 2148 pipe.bandwidth *= 1000000; 2149 } 2150 if (*end == 'B' || !strncmp(end, "by", 2)) 2151 pipe.bandwidth *= 8; 2152 if (pipe.bandwidth < 0) 2153 errx(EX_DATAERR, "bandwidth too large"); 2154 } 2155 ac--; av++; 2156 break; 2157 2158 case TOK_DELAY: 2159 if (do_pipe != 1) 2160 errx(EX_DATAERR, "delay only valid for pipes"); 2161 NEED1("delay needs argument 0..10000ms\n"); 2162 pipe.delay = strtoul(av[0], NULL, 0); 2163 ac--; av++; 2164 break; 2165 2166 case TOK_WEIGHT: 2167 if (do_pipe == 1) 2168 errx(EX_DATAERR,"weight only valid for queues"); 2169 NEED1("weight needs argument 0..100\n"); 2170 pipe.fs.weight = strtoul(av[0], &end, 0); 2171 ac--; av++; 2172 break; 2173 2174 case TOK_PIPE: 2175 if (do_pipe == 1) 2176 errx(EX_DATAERR,"pipe only valid for queues"); 2177 NEED1("pipe needs pipe_number\n"); 2178 pipe.fs.parent_nr = strtoul(av[0], &end, 0); 2179 ac--; av++; 2180 break; 2181 2182 default: 2183 errx(EX_DATAERR, "unrecognised option ``%s''", *av); 2184 } 2185 } 2186 if (do_pipe == 1) { 2187 if (pipe.pipe_nr == 0) 2188 errx(EX_DATAERR, "pipe_nr must be > 0"); 2189 if (pipe.delay > 10000) 2190 errx(EX_DATAERR, "delay must be < 10000"); 2191 } else { /* do_pipe == 2, queue */ 2192 if (pipe.fs.parent_nr == 0) 2193 errx(EX_DATAERR, "pipe must be > 0"); 2194 if (pipe.fs.weight >100) 2195 errx(EX_DATAERR, "weight must be <= 100"); 2196 } 2197 if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2198 if (pipe.fs.qsize > 1024*1024) 2199 errx(EX_DATAERR, "queue size must be < 1MB"); 2200 } else { 2201 if (pipe.fs.qsize > 100) 2202 errx(EX_DATAERR, "2 <= queue size <= 100"); 2203 } 2204 if (pipe.fs.flags_fs & DN_IS_RED) { 2205 size_t len; 2206 int lookup_depth, avg_pkt_size; 2207 double s, idle, weight, w_q; 2208 struct clockinfo clock; 2209 int t; 2210 2211 if (pipe.fs.min_th >= pipe.fs.max_th) 2212 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2213 pipe.fs.min_th, pipe.fs.max_th); 2214 if (pipe.fs.max_th == 0) 2215 errx(EX_DATAERR, "max_th must be > 0"); 2216 2217 len = sizeof(int); 2218 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2219 &lookup_depth, &len, NULL, 0) == -1) 2220 2221 errx(1, "sysctlbyname(\"%s\")", 2222 "net.inet.ip.dummynet.red_lookup_depth"); 2223 if (lookup_depth == 0) 2224 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2225 " must be greater than zero"); 2226 2227 len = sizeof(int); 2228 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2229 &avg_pkt_size, &len, NULL, 0) == -1) 2230 2231 errx(1, "sysctlbyname(\"%s\")", 2232 "net.inet.ip.dummynet.red_avg_pkt_size"); 2233 if (avg_pkt_size == 0) 2234 errx(EX_DATAERR, 2235 "net.inet.ip.dummynet.red_avg_pkt_size must" 2236 " be greater than zero"); 2237 2238 len = sizeof(struct clockinfo); 2239 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1) 2240 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2241 2242 /* 2243 * Ticks needed for sending a medium-sized packet. 2244 * Unfortunately, when we are configuring a WF2Q+ queue, we 2245 * do not have bandwidth information, because that is stored 2246 * in the parent pipe, and also we have multiple queues 2247 * competing for it. So we set s=0, which is not very 2248 * correct. But on the other hand, why do we want RED with 2249 * WF2Q+ ? 2250 */ 2251 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */ 2252 s = 0; 2253 else 2254 s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth; 2255 2256 /* 2257 * max idle time (in ticks) before avg queue size becomes 0. 2258 * NOTA: (3/w_q) is approx the value x so that 2259 * (1-w_q)^x < 10^-3. 2260 */ 2261 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED); 2262 idle = s * 3. / w_q; 2263 pipe.fs.lookup_step = (int)idle / lookup_depth; 2264 if (!pipe.fs.lookup_step) 2265 pipe.fs.lookup_step = 1; 2266 weight = 1 - w_q; 2267 for (t = pipe.fs.lookup_step; t > 0; --t) 2268 weight *= weight; 2269 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2270 } 2271 i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe, 2272 sizeof pipe); 2273 if (i) 2274 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2275} 2276 2277static void 2278get_mac_addr_mask(char *p, u_char *addr, u_char *mask) 2279{ 2280 int i, l; 2281 2282 for (i=0; i<6; i++) 2283 addr[i] = mask[i] = 0; 2284 if (!strcmp(p, "any")) 2285 return; 2286 2287 for (i=0; *p && i<6;i++, p++) { 2288 addr[i] = strtol(p, &p, 16); 2289 if (*p != ':') /* we start with the mask */ 2290 break; 2291 } 2292 if (*p == '/') { /* mask len */ 2293 l = strtol(p+1, &p, 0); 2294 for (i=0; l>0; l -=8, i++) 2295 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2296 } else if (*p == '&') { /* mask */ 2297 for (i=0, p++; *p && i<6;i++, p++) { 2298 mask[i] = strtol(p, &p, 16); 2299 if (*p != ':') 2300 break; 2301 } 2302 } else if (*p == '\0') { 2303 for (i=0; i<6; i++) 2304 mask[i] = 0xff; 2305 } 2306 for (i=0; i<6; i++) 2307 addr[i] &= mask[i]; 2308} 2309 2310/* 2311 * helper function, updates the pointer to cmd with the length 2312 * of the current command, and also cleans up the first word of 2313 * the new command in case it has been clobbered before. 2314 */ 2315static ipfw_insn * 2316next_cmd(ipfw_insn *cmd) 2317{ 2318 cmd += F_LEN(cmd); 2319 bzero(cmd, sizeof(*cmd)); 2320 return cmd; 2321} 2322 2323/* 2324 * A function to fill simple commands of size 1. 2325 * Existing flags are preserved. 2326 */ 2327static void 2328fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg) 2329{ 2330 cmd->opcode = opcode; 2331 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2332 cmd->arg1 = arg; 2333} 2334 2335/* 2336 * Fetch and add the MAC address and type, with masks. This generates one or 2337 * two microinstructions, and returns the pointer to the last one. 2338 */ 2339static ipfw_insn * 2340add_mac(ipfw_insn *cmd, int ac, char *av[]) 2341{ 2342 ipfw_insn_mac *mac; 2343 2344 if (ac < 2) 2345 errx(EX_DATAERR, "MAC dst src"); 2346 2347 cmd->opcode = O_MACADDR2; 2348 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2349 2350 mac = (ipfw_insn_mac *)cmd; 2351 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2352 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2353 return cmd; 2354} 2355 2356static ipfw_insn * 2357add_mactype(ipfw_insn *cmd, int ac, char *av) 2358{ 2359 if (ac < 1) 2360 errx(EX_DATAERR, "missing MAC type"); 2361 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2362 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2363 cmd->opcode = O_MAC_TYPE; 2364 return cmd; 2365 } else 2366 return NULL; 2367} 2368 2369static ipfw_insn * 2370add_proto(ipfw_insn *cmd, char *av) 2371{ 2372 struct protoent *pe; 2373 u_char proto = 0; 2374 2375 if (!strncmp(av, "all", strlen(av))) 2376 ; /* same as "ip" */ 2377 else if ((proto = atoi(av)) > 0) 2378 ; /* all done! */ 2379 else if ((pe = getprotobyname(av)) != NULL) 2380 proto = pe->p_proto; 2381 else 2382 return NULL; 2383 if (proto != IPPROTO_IP) 2384 fill_cmd(cmd, O_PROTO, 0, proto); 2385 return cmd; 2386} 2387 2388static ipfw_insn * 2389add_srcip(ipfw_insn *cmd, char *av) 2390{ 2391 fill_ip((ipfw_insn_ip *)cmd, av); 2392 if (cmd->opcode == O_IP_DST_SET) /* set */ 2393 cmd->opcode = O_IP_SRC_SET; 2394 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2395 cmd->opcode = O_IP_SRC_ME; 2396 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2397 cmd->opcode = O_IP_SRC; 2398 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip)) /* addr/mask */ 2399 cmd->opcode = O_IP_SRC_MASK; 2400 return cmd; 2401} 2402 2403static ipfw_insn * 2404add_dstip(ipfw_insn *cmd, char *av) 2405{ 2406 fill_ip((ipfw_insn_ip *)cmd, av); 2407 if (cmd->opcode == O_IP_DST_SET) /* set */ 2408 ; 2409 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2410 cmd->opcode = O_IP_DST_ME; 2411 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2412 cmd->opcode = O_IP_DST; 2413 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip)) /* addr/mask */ 2414 cmd->opcode = O_IP_DST_MASK; 2415 return cmd; 2416} 2417 2418static ipfw_insn * 2419add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2420{ 2421 if (!strncmp(av, "any", strlen(av))) { 2422 return NULL; 2423 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2424 /* XXX todo: check that we have a protocol with ports */ 2425 cmd->opcode = opcode; 2426 return cmd; 2427 } 2428 return NULL; 2429} 2430 2431/* 2432 * Parse arguments and assemble the microinstructions which make up a rule. 2433 * Rules are added into the 'rulebuf' and then copied in the correct order 2434 * into the actual rule. 2435 * 2436 * The syntax for a rule starts with the action, followed by an 2437 * optional log action, and the various match patterns. 2438 * In the assembled microcode, the first opcode must be a O_PROBE_STATE 2439 * (generated if the rule includes a keep-state option), then the 2440 * various match patterns, the "log" action, and the actual action. 2441 * 2442 */ 2443static void 2444add(int ac, char *av[]) 2445{ 2446 /* 2447 * rules are added into the 'rulebuf' and then copied in 2448 * the correct order into the actual rule. 2449 * Some things that need to go out of order (prob, action etc.) 2450 * go into actbuf[]. 2451 */ 2452 static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2453 2454 ipfw_insn *src, *dst, *cmd, *action, *prev; 2455 ipfw_insn *first_cmd; /* first match pattern */ 2456 2457 struct ip_fw *rule; 2458 2459 /* 2460 * various flags used to record that we entered some fields. 2461 */ 2462 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2463 2464 int i; 2465 2466 int open_par = 0; /* open parenthesis ( */ 2467 2468 /* proto is here because it is used to fetch ports */ 2469 u_char proto = IPPROTO_IP; /* default protocol */ 2470 2471 double match_prob = 1; /* match probability, default is always match */ 2472 2473 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2474 bzero(cmdbuf, sizeof(cmdbuf)); 2475 bzero(rulebuf, sizeof(rulebuf)); 2476 2477 rule = (struct ip_fw *)rulebuf; 2478 cmd = (ipfw_insn *)cmdbuf; 2479 action = (ipfw_insn *)actbuf; 2480 2481 av++; ac--; 2482 2483 /* [rule N] -- Rule number optional */ 2484 if (ac && isdigit(**av)) { 2485 rule->rulenum = atoi(*av); 2486 av++; 2487 ac--; 2488 } 2489 2490 /* [set N] -- set number (0..30), optional */ 2491 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2492 int set = strtoul(av[1], NULL, 10); 2493 if (set < 0 || set > 30) 2494 errx(EX_DATAERR, "illegal set %s", av[1]); 2495 rule->set = set; 2496 av += 2; ac -= 2; 2497 } 2498 2499 /* [prob D] -- match probability, optional */ 2500 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2501 match_prob = strtod(av[1], NULL); 2502 2503 if (match_prob <= 0 || match_prob > 1) 2504 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2505 av += 2; ac -= 2; 2506 } 2507 2508 /* action -- mandatory */ 2509 NEED1("missing action"); 2510 i = match_token(rule_actions, *av); 2511 ac--; av++; 2512 action->len = 1; /* default */ 2513 switch(i) { 2514 case TOK_CHECKSTATE: 2515 have_state = action; 2516 action->opcode = O_CHECK_STATE; 2517 break; 2518 2519 case TOK_ACCEPT: 2520 action->opcode = O_ACCEPT; 2521 break; 2522 2523 case TOK_DENY: 2524 action->opcode = O_DENY; 2525 action->arg1 = 0; 2526 break; 2527 2528 case TOK_REJECT: 2529 action->opcode = O_REJECT; 2530 action->arg1 = ICMP_UNREACH_HOST; 2531 break; 2532 2533 case TOK_RESET: 2534 action->opcode = O_REJECT; 2535 action->arg1 = ICMP_REJECT_RST; 2536 break; 2537 2538 case TOK_UNREACH: 2539 action->opcode = O_REJECT; 2540 NEED1("missing reject code"); 2541 fill_reject_code(&action->arg1, *av); 2542 ac--; av++; 2543 break; 2544 2545 case TOK_COUNT: 2546 action->opcode = O_COUNT; 2547 break; 2548 2549 case TOK_QUEUE: 2550 case TOK_PIPE: 2551 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2552 case TOK_SKIPTO: 2553 if (i == TOK_QUEUE) 2554 action->opcode = O_QUEUE; 2555 else if (i == TOK_PIPE) 2556 action->opcode = O_PIPE; 2557 else if (i == TOK_SKIPTO) 2558 action->opcode = O_SKIPTO; 2559 NEED1("missing skipto/pipe/queue number"); 2560 action->arg1 = strtoul(*av, NULL, 10); 2561 av++; ac--; 2562 break; 2563 2564 case TOK_DIVERT: 2565 case TOK_TEE: 2566 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2567 NEED1("missing divert/tee port"); 2568 action->arg1 = strtoul(*av, NULL, 0); 2569 if (action->arg1 == 0) { 2570 struct servent *s; 2571 setservent(1); 2572 s = getservbyname(av[0], "divert"); 2573 if (s != NULL) 2574 action->arg1 = ntohs(s->s_port); 2575 else 2576 errx(EX_DATAERR, "illegal divert/tee port"); 2577 } 2578 ac--; av++; 2579 break; 2580 2581 case TOK_FORWARD: { 2582 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2583 char *s, *end; 2584 2585 NEED1("missing forward address[:port]"); 2586 2587 action->opcode = O_FORWARD_IP; 2588 action->len = F_INSN_SIZE(ipfw_insn_sa); 2589 2590 p->sa.sin_len = sizeof(struct sockaddr_in); 2591 p->sa.sin_family = AF_INET; 2592 p->sa.sin_port = 0; 2593 /* 2594 * locate the address-port separator (':' or ',') 2595 */ 2596 s = strchr(*av, ':'); 2597 if (s == NULL) 2598 s = strchr(*av, ','); 2599 if (s != NULL) { 2600 *(s++) = '\0'; 2601 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2602 if (s == end) 2603 errx(EX_DATAERR, 2604 "illegal forwarding port ``%s''", s); 2605 p->sa.sin_port = (u_short)i; 2606 } 2607 lookup_host(*av, &(p->sa.sin_addr)); 2608 } 2609 ac--; av++; 2610 break; 2611 2612 default: 2613 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2614 } 2615 action = next_cmd(action); 2616 2617 /* 2618 * [log [logamount N]] -- log, optional 2619 * 2620 * If exists, it goes first in the cmdbuf, but then it is 2621 * skipped in the copy section to the end of the buffer. 2622 */ 2623 if (ac && !strncmp(*av, "log", strlen(*av))) { 2624 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2625 2626 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2627 cmd->opcode = O_LOG; 2628 av++; ac--; 2629 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2630 ac--; av++; 2631 NEED1("logamount requires argument"); 2632 c->max_log = atoi(*av); 2633 if (c->max_log < 0) 2634 errx(EX_DATAERR, "logamount must be positive"); 2635 ac--; av++; 2636 } 2637 cmd = next_cmd(cmd); 2638 } 2639 2640 if (have_state) /* must be a check-state, we are done */ 2641 goto done; 2642 2643#define OR_START(target) \ 2644 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2645 if (open_par) \ 2646 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2647 prev = NULL; \ 2648 open_par = 1; \ 2649 if ( (av[0])[1] == '\0') { \ 2650 ac--; av++; \ 2651 } else \ 2652 (*av)++; \ 2653 } \ 2654 target: \ 2655 2656 2657#define CLOSE_PAR \ 2658 if (open_par) { \ 2659 if (ac && ( \ 2660 !strncmp(*av, ")", strlen(*av)) || \ 2661 !strncmp(*av, "}", strlen(*av)) )) { \ 2662 prev = NULL; \ 2663 open_par = 0; \ 2664 ac--; av++; \ 2665 } else \ 2666 errx(EX_USAGE, "missing \")\"\n"); \ 2667 } 2668 2669#define NOT_BLOCK \ 2670 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2671 if (cmd->len & F_NOT) \ 2672 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2673 cmd->len |= F_NOT; \ 2674 ac--; av++; \ 2675 } 2676 2677#define OR_BLOCK(target) \ 2678 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2679 if (prev == NULL || open_par == 0) \ 2680 errx(EX_DATAERR, "invalid OR block"); \ 2681 prev->len |= F_OR; \ 2682 ac--; av++; \ 2683 goto target; \ 2684 } \ 2685 CLOSE_PAR; 2686 2687 first_cmd = cmd; 2688 2689#if 0 2690 /* 2691 * MAC addresses, optional. 2692 * If we have this, we skip the part "proto from src to dst" 2693 * and jump straight to the option parsing. 2694 */ 2695 NOT_BLOCK; 2696 NEED1("missing protocol"); 2697 if (!strncmp(*av, "MAC", strlen(*av)) || 2698 !strncmp(*av, "mac", strlen(*av))) { 2699 ac--; av++; /* the "MAC" keyword */ 2700 add_mac(cmd, ac, av); /* exits in case of errors */ 2701 cmd = next_cmd(cmd); 2702 ac -= 2; av += 2; /* dst-mac and src-mac */ 2703 NOT_BLOCK; 2704 NEED1("missing mac type"); 2705 if (add_mactype(cmd, ac, av[0])) 2706 cmd = next_cmd(cmd); 2707 ac--; av++; /* any or mac-type */ 2708 goto read_options; 2709 } 2710#endif 2711 2712 /* 2713 * protocol, mandatory 2714 */ 2715 OR_START(get_proto); 2716 NOT_BLOCK; 2717 NEED1("missing protocol"); 2718 if (add_proto(cmd, *av)) { 2719 av++; ac--; 2720 if (F_LEN(cmd) == 0) /* plain IP */ 2721 proto = 0; 2722 else { 2723 proto = cmd->arg1; 2724 prev = cmd; 2725 cmd = next_cmd(cmd); 2726 } 2727 } else if (first_cmd != cmd) { 2728 errx(EX_DATAERR, "invalid protocol ``%s''", av); 2729 } else 2730 goto read_options; 2731 OR_BLOCK(get_proto); 2732 2733 /* 2734 * "from", mandatory 2735 */ 2736 if (!ac || strncmp(*av, "from", strlen(*av))) 2737 errx(EX_USAGE, "missing ``from''"); 2738 ac--; av++; 2739 2740 /* 2741 * source IP, mandatory 2742 */ 2743 OR_START(source_ip); 2744 NOT_BLOCK; /* optional "not" */ 2745 NEED1("missing source address"); 2746 if (add_srcip(cmd, *av)) { 2747 ac--; av++; 2748 if (F_LEN(cmd) != 0) { /* ! any */ 2749 prev = cmd; 2750 cmd = next_cmd(cmd); 2751 } 2752 } 2753 OR_BLOCK(source_ip); 2754 2755 /* 2756 * source ports, optional 2757 */ 2758 NOT_BLOCK; /* optional "not" */ 2759 if (ac) { 2760 if (!strncmp(*av, "any", strlen(*av)) || 2761 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 2762 ac--; av++; 2763 if (F_LEN(cmd) != 0) 2764 cmd = next_cmd(cmd); 2765 } 2766 } 2767 2768 /* 2769 * "to", mandatory 2770 */ 2771 if (!ac || strncmp(*av, "to", strlen(*av))) 2772 errx(EX_USAGE, "missing ``to''"); 2773 av++; ac--; 2774 2775 /* 2776 * destination, mandatory 2777 */ 2778 OR_START(dest_ip); 2779 NOT_BLOCK; /* optional "not" */ 2780 NEED1("missing dst address"); 2781 if (add_dstip(cmd, *av)) { 2782 ac--; av++; 2783 if (F_LEN(cmd) != 0) { /* ! any */ 2784 prev = cmd; 2785 cmd = next_cmd(cmd); 2786 } 2787 } 2788 OR_BLOCK(dest_ip); 2789 2790 /* 2791 * dest. ports, optional 2792 */ 2793 NOT_BLOCK; /* optional "not" */ 2794 if (ac) { 2795 if (!strncmp(*av, "any", strlen(*av)) || 2796 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 2797 ac--; av++; 2798 if (F_LEN(cmd) != 0) 2799 cmd = next_cmd(cmd); 2800 } 2801 } 2802 2803read_options: 2804 if (ac && first_cmd == cmd) { 2805 /* 2806 * nothing specified so far, store in the rule to ease 2807 * printout later. 2808 */ 2809 rule->_pad = 1; 2810 } 2811 prev = NULL; 2812 while (ac) { 2813 char *s; 2814 ipfw_insn_u32 *cmd32; /* alias for cmd */ 2815 2816 s = *av; 2817 cmd32 = (ipfw_insn_u32 *)cmd; 2818 2819 if (*s == '!') { /* alternate syntax for NOT */ 2820 if (cmd->len & F_NOT) 2821 errx(EX_USAGE, "double \"not\" not allowed\n"); 2822 cmd->len = F_NOT; 2823 s++; 2824 } 2825 i = match_token(rule_options, s); 2826 ac--; av++; 2827 switch(i) { 2828 case TOK_NOT: 2829 if (cmd->len & F_NOT) 2830 errx(EX_USAGE, "double \"not\" not allowed\n"); 2831 cmd->len = F_NOT; 2832 break; 2833 2834 case TOK_OR: 2835 if (open_par == 0 || prev == NULL) 2836 errx(EX_USAGE, "invalid \"or\" block\n"); 2837 prev->len |= F_OR; 2838 break; 2839 2840 case TOK_STARTBRACE: 2841 if (open_par) 2842 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 2843 open_par = 1; 2844 break; 2845 2846 case TOK_ENDBRACE: 2847 if (!open_par) 2848 errx(EX_USAGE, "+missing \")\"\n"); 2849 open_par = 0; 2850 prev = NULL; 2851 break; 2852 2853 case TOK_IN: 2854 fill_cmd(cmd, O_IN, 0, 0); 2855 break; 2856 2857 case TOK_OUT: 2858 cmd->len ^= F_NOT; /* toggle F_NOT */ 2859 fill_cmd(cmd, O_IN, 0, 0); 2860 break; 2861 2862 case TOK_FRAG: 2863 fill_cmd(cmd, O_FRAG, 0, 0); 2864 break; 2865 2866 case TOK_LAYER2: 2867 fill_cmd(cmd, O_LAYER2, 0, 0); 2868 break; 2869 2870 case TOK_XMIT: 2871 case TOK_RECV: 2872 case TOK_VIA: 2873 NEED1("recv, xmit, via require interface name" 2874 " or address"); 2875 fill_iface((ipfw_insn_if *)cmd, av[0]); 2876 ac--; av++; 2877 if (F_LEN(cmd) == 0) /* not a valid address */ 2878 break; 2879 if (i == TOK_XMIT) 2880 cmd->opcode = O_XMIT; 2881 else if (i == TOK_RECV) 2882 cmd->opcode = O_RECV; 2883 else if (i == TOK_VIA) 2884 cmd->opcode = O_VIA; 2885 break; 2886 2887 case TOK_ICMPTYPES: 2888 NEED1("icmptypes requires list of types"); 2889 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 2890 av++; ac--; 2891 break; 2892 2893 case TOK_IPTTL: 2894 NEED1("ipttl requires TTL"); 2895 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 2896 ac--; av++; 2897 break; 2898 2899 case TOK_IPID: 2900 NEED1("ipid requires length"); 2901 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 2902 ac--; av++; 2903 break; 2904 2905 case TOK_IPLEN: 2906 NEED1("iplen requires length"); 2907 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 2908 ac--; av++; 2909 break; 2910 2911 case TOK_IPVER: 2912 NEED1("ipver requires version"); 2913 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 2914 ac--; av++; 2915 break; 2916 2917 case TOK_IPPRECEDENCE: 2918 NEED1("ipprecedence requires value"); 2919 fill_cmd(cmd, O_IPPRECEDENCE, 0, 2920 (strtoul(*av, NULL, 0) & 7) << 5); 2921 ac--; av++; 2922 break; 2923 2924 case TOK_IPOPTS: 2925 NEED1("missing argument for ipoptions"); 2926 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 2927 ac--; av++; 2928 break; 2929 2930 case TOK_IPTOS: 2931 NEED1("missing argument for iptos"); 2932 fill_flags(cmd, O_IPTOS, f_iptos, *av); 2933 ac--; av++; 2934 break; 2935 2936 case TOK_UID: 2937 NEED1("uid requires argument"); 2938 { 2939 char *end; 2940 uid_t uid; 2941 struct passwd *pwd; 2942 2943 cmd->opcode = O_UID; 2944 uid = strtoul(*av, &end, 0); 2945 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 2946 if (pwd == NULL) 2947 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 2948 cmd32->d[0] = pwd->pw_uid; 2949 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 2950 ac--; av++; 2951 } 2952 break; 2953 2954 case TOK_GID: 2955 NEED1("gid requires argument"); 2956 { 2957 char *end; 2958 gid_t gid; 2959 struct group *grp; 2960 2961 cmd->opcode = O_GID; 2962 gid = strtoul(*av, &end, 0); 2963 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 2964 if (grp == NULL) 2965 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 2966 cmd32->d[0] = grp->gr_gid; 2967 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 2968 ac--; av++; 2969 } 2970 break; 2971 2972 case TOK_ESTAB: 2973 fill_cmd(cmd, O_ESTAB, 0, 0); 2974 break; 2975 2976 case TOK_SETUP: 2977 fill_cmd(cmd, O_TCPFLAGS, 0, 2978 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 2979 break; 2980 2981 case TOK_TCPOPTS: 2982 NEED1("missing argument for tcpoptions"); 2983 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 2984 ac--; av++; 2985 break; 2986 2987 case TOK_TCPSEQ: 2988 case TOK_TCPACK: 2989 NEED1("tcpseq/tcpack requires argument"); 2990 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 2991 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 2992 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 2993 ac--; av++; 2994 break; 2995 2996 case TOK_TCPWIN: 2997 NEED1("tcpwin requires length"); 2998 fill_cmd(cmd, O_TCPWIN, 0, 2999 htons(strtoul(*av, NULL, 0))); 3000 ac--; av++; 3001 break; 3002 3003 case TOK_TCPFLAGS: 3004 NEED1("missing argument for tcpflags"); 3005 cmd->opcode = O_TCPFLAGS; 3006 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3007 ac--; av++; 3008 break; 3009 3010 case TOK_KEEPSTATE: 3011 if (open_par) 3012 errx(EX_USAGE, "keep-state cannot be part " 3013 "of an or block"); 3014 if (have_state) 3015 errx(EX_USAGE, "only one of keep-state " 3016 "and limit is allowed"); 3017 have_state = cmd; 3018 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3019 break; 3020 3021 case TOK_LIMIT: 3022 if (open_par) 3023 errx(EX_USAGE, "limit cannot be part " 3024 "of an or block"); 3025 if (have_state) 3026 errx(EX_USAGE, "only one of keep-state " 3027 "and limit is allowed"); 3028 NEED1("limit needs mask and # of connections"); 3029 have_state = cmd; 3030 { 3031 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3032 3033 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3034 cmd->opcode = O_LIMIT; 3035 c->limit_mask = 0; 3036 c->conn_limit = 0; 3037 for (; ac >1 ;) { 3038 int val; 3039 3040 val = match_token(limit_masks, *av); 3041 if (val <= 0) 3042 break; 3043 c->limit_mask |= val; 3044 ac--; av++; 3045 } 3046 c->conn_limit = atoi(*av); 3047 if (c->conn_limit == 0) 3048 errx(EX_USAGE, "limit: limit must be >0"); 3049 if (c->limit_mask == 0) 3050 errx(EX_USAGE, "missing limit mask"); 3051 ac--; av++; 3052 } 3053 break; 3054 3055 case TOK_PROTO: 3056 NEED1("missing protocol"); 3057 if (add_proto(cmd, *av)) { 3058 proto = cmd->arg1; 3059 ac--; av++; 3060 } else 3061 errx(EX_DATAERR, "invalid protocol ``%s''", av); 3062 break; 3063 3064 case TOK_SRCIP: 3065 NEED1("missing source IP"); 3066 if (add_srcip(cmd, *av)) { 3067 ac--; av++; 3068 } 3069 break; 3070 3071 case TOK_DSTIP: 3072 NEED1("missing destination IP"); 3073 if (add_dstip(cmd, *av)) { 3074 ac--; av++; 3075 } 3076 break; 3077 3078 case TOK_SRCPORT: 3079 NEED1("missing source port"); 3080 if (!strncmp(*av, "any", strlen(*av)) || 3081 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3082 ac--; av++; 3083 } else 3084 errx(EX_DATAERR, "invalid source port %s", *av); 3085 break; 3086 3087 case TOK_DSTPORT: 3088 NEED1("missing destination port"); 3089 if (!strncmp(*av, "any", strlen(*av)) || 3090 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3091 ac--; av++; 3092 } else 3093 errx(EX_DATAERR, "invalid destination port %s", 3094 *av); 3095 break; 3096 3097 case TOK_MAC: 3098 if (ac < 2) 3099 errx(EX_USAGE, "MAC dst-mac src-mac"); 3100 if (add_mac(cmd, ac, av)) { 3101 ac -= 2; av += 2; 3102 } 3103 break; 3104 3105 case TOK_MACTYPE: 3106 NEED1("missing mac type"); 3107 if (!add_mactype(cmd, ac, *av)) 3108 errx(EX_DATAERR, "invalid mac type %s", av); 3109 ac--; av++; 3110 break; 3111 3112 default: 3113 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3114 } 3115 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3116 prev = cmd; 3117 cmd = next_cmd(cmd); 3118 } 3119 } 3120 3121done: 3122 /* 3123 * Now copy stuff into the rule. 3124 * If we have a keep-state option, the first instruction 3125 * must be a PROBE_STATE (which is generated here). 3126 * If we have a LOG option, it was stored as the first command, 3127 * and now must be moved to the top of the action part. 3128 */ 3129 dst = (ipfw_insn *)rule->cmd; 3130 3131 /* 3132 * First thing to write into the command stream is the match probability. 3133 */ 3134 if (match_prob != 1) { /* 1 means always match */ 3135 dst->opcode = O_PROB; 3136 dst->len = 2; 3137 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3138 dst += dst->len; 3139 } 3140 3141 /* 3142 * generate O_PROBE_STATE if necessary 3143 */ 3144 if (have_state && have_state->opcode != O_CHECK_STATE) { 3145 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3146 dst = next_cmd(dst); 3147 } 3148 /* 3149 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3150 */ 3151 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3152 i = F_LEN(src); 3153 3154 switch (src->opcode) { 3155 case O_LOG: 3156 case O_KEEP_STATE: 3157 case O_LIMIT: 3158 break; 3159 default: 3160 bcopy(src, dst, i * sizeof(u_int32_t)); 3161 dst += i; 3162 } 3163 } 3164 3165 /* 3166 * put back the have_state command as last opcode 3167 */ 3168 if (have_state && have_state->opcode != O_CHECK_STATE) { 3169 i = F_LEN(have_state); 3170 bcopy(have_state, dst, i * sizeof(u_int32_t)); 3171 dst += i; 3172 } 3173 /* 3174 * start action section 3175 */ 3176 rule->act_ofs = dst - rule->cmd; 3177 3178 /* 3179 * put back O_LOG if necessary 3180 */ 3181 src = (ipfw_insn *)cmdbuf; 3182 if ( src->opcode == O_LOG ) { 3183 i = F_LEN(src); 3184 bcopy(src, dst, i * sizeof(u_int32_t)); 3185 dst += i; 3186 } 3187 /* 3188 * copy all other actions 3189 */ 3190 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3191 i = F_LEN(src); 3192 bcopy(src, dst, i * sizeof(u_int32_t)); 3193 dst += i; 3194 } 3195 3196 rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd); 3197 i = (void *)dst - (void *)rule; 3198 if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1) 3199 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3200 if (!do_quiet) 3201 show_ipfw(rule); 3202} 3203 3204static void 3205zero(int ac, char *av[]) 3206{ 3207 int rulenum; 3208 int failed = EX_OK; 3209 3210 av++; ac--; 3211 3212 if (!ac) { 3213 /* clear all entries */ 3214 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0) 3215 err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO"); 3216 if (!do_quiet) 3217 printf("Accounting cleared.\n"); 3218 3219 return; 3220 } 3221 3222 while (ac) { 3223 /* Rule number */ 3224 if (isdigit(**av)) { 3225 rulenum = atoi(*av); 3226 av++; 3227 ac--; 3228 if (setsockopt(s, IPPROTO_IP, 3229 IP_FW_ZERO, &rulenum, sizeof rulenum)) { 3230 warn("rule %u: setsockopt(IP_FW_ZERO)", 3231 rulenum); 3232 failed = EX_UNAVAILABLE; 3233 } else if (!do_quiet) 3234 printf("Entry %d cleared\n", rulenum); 3235 } else { 3236 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3237 } 3238 } 3239 if (failed != EX_OK) 3240 exit(failed); 3241} 3242 3243static void 3244resetlog(int ac, char *av[]) 3245{ 3246 int rulenum; 3247 int failed = EX_OK; 3248 3249 av++; ac--; 3250 3251 if (!ac) { 3252 /* clear all entries */ 3253 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0) 3254 err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)"); 3255 if (!do_quiet) 3256 printf("Logging counts reset.\n"); 3257 3258 return; 3259 } 3260 3261 while (ac) { 3262 /* Rule number */ 3263 if (isdigit(**av)) { 3264 rulenum = atoi(*av); 3265 av++; 3266 ac--; 3267 if (setsockopt(s, IPPROTO_IP, 3268 IP_FW_RESETLOG, &rulenum, sizeof rulenum)) { 3269 warn("rule %u: setsockopt(IP_FW_RESETLOG)", 3270 rulenum); 3271 failed = EX_UNAVAILABLE; 3272 } else if (!do_quiet) 3273 printf("Entry %d logging count reset\n", 3274 rulenum); 3275 } else { 3276 errx(EX_DATAERR, "invalid rule number ``%s''", *av); 3277 } 3278 } 3279 if (failed != EX_OK) 3280 exit(failed); 3281} 3282 3283static void 3284flush() 3285{ 3286 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3287 3288 if (!do_force && !do_quiet) { /* need to ask user */ 3289 int c; 3290 3291 printf("Are you sure? [yn] "); 3292 fflush(stdout); 3293 do { 3294 c = toupper(getc(stdin)); 3295 while (c != '\n' && getc(stdin) != '\n') 3296 if (feof(stdin)) 3297 return; /* and do not flush */ 3298 } while (c != 'Y' && c != 'N'); 3299 printf("\n"); 3300 if (c == 'N') /* user said no */ 3301 return; 3302 } 3303 if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0) 3304 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3305 do_pipe ? "DUMMYNET" : "FW"); 3306 if (!do_quiet) 3307 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3308} 3309 3310static int 3311ipfw_main(int ac, char **av) 3312{ 3313 int ch; 3314 3315 if (ac == 1) 3316 show_usage(); 3317 3318 /* Set the force flag for non-interactive processes */ 3319 do_force = !isatty(STDIN_FILENO); 3320 3321 optind = optreset = 1; 3322 while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1) 3323 switch (ch) { 3324 case 'h': /* help */ 3325 help(); 3326 break; /* NOTREACHED */ 3327 3328 case 's': /* sort */ 3329 do_sort = atoi(optarg); 3330 break; 3331 case 'a': 3332 do_acct = 1; 3333 break; 3334 case 'c': 3335 do_compact = 1; 3336 break; 3337 case 'd': 3338 do_dynamic = 1; 3339 break; 3340 case 'e': 3341 do_expired = 1; 3342 break; 3343 case 'f': 3344 do_force = 1; 3345 break; 3346 case 'N': 3347 do_resolv = 1; 3348 break; 3349 case 'q': 3350 do_quiet = 1; 3351 break; 3352 case 'S': 3353 show_sets = 1; 3354 break; 3355 case 't': 3356 do_time = 1; 3357 break; 3358 case 'v': /* verbose */ 3359 verbose++; 3360 break; 3361 default: 3362 show_usage(); 3363 } 3364 3365 ac -= optind; 3366 av += optind; 3367 NEED1("bad arguments, for usage summary ``ipfw''"); 3368 3369 /* 3370 * optional: pipe or queue 3371 */ 3372 if (!strncmp(*av, "pipe", strlen(*av))) { 3373 do_pipe = 1; 3374 ac--; 3375 av++; 3376 } else if (!strncmp(*av, "queue", strlen(*av))) { 3377 do_pipe = 2; 3378 ac--; 3379 av++; 3380 } 3381 NEED1("missing command"); 3382 3383 /* 3384 * for pipes and queues we normally say 'pipe NN config' 3385 * but the code is easier to parse as 'pipe config NN' 3386 * so we swap the two arguments. 3387 */ 3388 if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') { 3389 char *p = av[0]; 3390 av[0] = av[1]; 3391 av[1] = p; 3392 } 3393 if (!strncmp(*av, "add", strlen(*av))) 3394 add(ac, av); 3395 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3396 config_pipe(ac, av); 3397 else if (!strncmp(*av, "delete", strlen(*av))) 3398 delete(ac, av); 3399 else if (!strncmp(*av, "flush", strlen(*av))) 3400 flush(); 3401 else if (!strncmp(*av, "zero", strlen(*av))) 3402 zero(ac, av); 3403 else if (!strncmp(*av, "resetlog", strlen(*av))) 3404 resetlog(ac, av); 3405 else if (!strncmp(*av, "print", strlen(*av)) || 3406 !strncmp(*av, "list", strlen(*av))) 3407 list(ac, av); 3408 else if (!strncmp(*av, "set", strlen(*av))) 3409 sets_handler(ac, av); 3410 else if (!strncmp(*av, "show", strlen(*av))) { 3411 do_acct++; 3412 list(ac, av); 3413 } else 3414 errx(EX_USAGE, "bad command `%s'", *av); 3415 return 0; 3416} 3417 3418 3419static void 3420ipfw_readfile(int ac, char *av[]) 3421{ 3422#define MAX_ARGS 32 3423#define WHITESP " \t\f\v\n\r" 3424 char buf[BUFSIZ]; 3425 char *a, *p, *args[MAX_ARGS], *cmd = NULL; 3426 char linename[10]; 3427 int i=0, lineno=0, qflag=0, pflag=0, status; 3428 FILE *f = NULL; 3429 pid_t preproc = 0; 3430 int c; 3431 3432 while ((c = getopt(ac, av, "p:q")) != -1) { 3433 switch(c) { 3434 case 'p': 3435 pflag = 1; 3436 cmd = optarg; 3437 args[0] = cmd; 3438 i = 1; 3439 break; 3440 3441 case 'q': 3442 qflag = 1; 3443 break; 3444 3445 default: 3446 errx(EX_USAGE, "bad arguments, for usage" 3447 " summary ``ipfw''"); 3448 } 3449 3450 if (pflag) 3451 break; 3452 } 3453 3454 if (pflag) { 3455 /* Pass all but the last argument to the preprocessor. */ 3456 while (optind < ac - 1) { 3457 if (i >= MAX_ARGS) 3458 errx(EX_USAGE, "too many preprocessor options"); 3459 args[i++] = av[optind++]; 3460 } 3461 } 3462 3463 av += optind; 3464 ac -= optind; 3465 if (ac != 1) 3466 errx(EX_USAGE, "extraneous filename arguments"); 3467 3468 if ((f = fopen(av[0], "r")) == NULL) 3469 err(EX_UNAVAILABLE, "fopen: %s", av[0]); 3470 3471 if (pflag) { 3472 /* pipe through preprocessor (cpp or m4) */ 3473 int pipedes[2]; 3474 3475 args[i] = 0; 3476 3477 if (pipe(pipedes) == -1) 3478 err(EX_OSERR, "cannot create pipe"); 3479 3480 switch((preproc = fork())) { 3481 case -1: 3482 err(EX_OSERR, "cannot fork"); 3483 3484 case 0: 3485 /* child */ 3486 if (dup2(fileno(f), 0) == -1 3487 || dup2(pipedes[1], 1) == -1) 3488 err(EX_OSERR, "dup2()"); 3489 fclose(f); 3490 close(pipedes[1]); 3491 close(pipedes[0]); 3492 execvp(cmd, args); 3493 err(EX_OSERR, "execvp(%s) failed", cmd); 3494 3495 default: 3496 /* parent */ 3497 fclose(f); 3498 close(pipedes[1]); 3499 if ((f = fdopen(pipedes[0], "r")) == NULL) { 3500 int savederrno = errno; 3501 3502 (void)kill(preproc, SIGTERM); 3503 errno = savederrno; 3504 err(EX_OSERR, "fdopen()"); 3505 } 3506 } 3507 } 3508 3509 while (fgets(buf, BUFSIZ, f)) { 3510 lineno++; 3511 sprintf(linename, "Line %d", lineno); 3512 args[0] = linename; 3513 3514 if (*buf == '#') 3515 continue; 3516 if ((p = strchr(buf, '#')) != NULL) 3517 *p = '\0'; 3518 i = 1; 3519 if (qflag) 3520 args[i++] = "-q"; 3521 for (a = strtok(buf, WHITESP); 3522 a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++) 3523 args[i] = a; 3524 if (i == (qflag? 2: 1)) 3525 continue; 3526 if (i == MAX_ARGS) 3527 errx(EX_USAGE, "%s: too many arguments", 3528 linename); 3529 args[i] = NULL; 3530 3531 ipfw_main(i, args); 3532 } 3533 fclose(f); 3534 if (pflag) { 3535 if (waitpid(preproc, &status, 0) == -1) 3536 errx(EX_OSERR, "waitpid()"); 3537 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 3538 errx(EX_UNAVAILABLE, 3539 "preprocessor exited with status %d", 3540 WEXITSTATUS(status)); 3541 else if (WIFSIGNALED(status)) 3542 errx(EX_UNAVAILABLE, 3543 "preprocessor exited with signal %d", 3544 WTERMSIG(status)); 3545 } 3546} 3547 3548int 3549main(int ac, char *av[]) 3550{ 3551 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 3552 if (s < 0) 3553 err(EX_UNAVAILABLE, "socket"); 3554 3555 /* 3556 * If the last argument is an absolute pathname, interpret it 3557 * as a file to be preprocessed. 3558 */ 3559 3560 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 3561 ipfw_readfile(ac, av); 3562 else 3563 ipfw_main(ac, av); 3564 return EX_OK; 3565} 3566