2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
5 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
6 * Internet Initiative Japan, Inc (IIJ)
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/param.h>
34 #include <netinet/in.h>
36 #include <netinet/in_systm.h>
37 #include <netinet/ip.h>
38 #include <sys/socket.h>
54 #include "throughput.h"
61 #include "slcompress.h"
65 #include "descriptor.h"
75 static unsigned filter_Nam2Op(const char *);
78 ParsePort(const char *service, const char *proto)
80 struct servent *servent;
84 servent = getservbyname(service, proto);
86 return ntohs(servent->s_port);
88 port = strtol(service, &cp, 0);
90 log_Printf(LogWARN, "ParsePort: %s is not a port name or number.\n",
98 * ICMP Syntax: src eq icmp_message_type
101 ParseIcmp(int argc, char const *const *argv, struct filterent *tgt)
108 /* permit/deny all ICMP types */
109 tgt->f_srcop = tgt->f_dstop = OP_NONE;
113 if (!strcmp(*argv, "src") && !strcmp(argv[1], "eq")) {
114 type = strtol(argv[2], &cp, 0);
116 log_Printf(LogWARN, "ParseIcmp: type is expected.\n");
119 tgt->f_srcop = OP_EQ;
120 tgt->f_srcport = type;
121 tgt->f_dstop = OP_NONE;
126 log_Printf(LogWARN, "ParseIcmp: bad icmp syntax.\n");
133 * UDP Syntax: [src op port] [dst op port]
136 ParseUdpOrTcp(int argc, char const *const *argv, const struct protoent *pe,
137 struct filterent *tgt)
139 tgt->f_srcop = tgt->f_dstop = OP_NONE;
140 tgt->f_estab = tgt->f_syn = tgt->f_finrst = 0;
142 if (argc >= 3 && !strcmp(*argv, "src")) {
143 tgt->f_srcop = filter_Nam2Op(argv[1]);
144 if (tgt->f_srcop == OP_NONE) {
145 log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
150 tgt->f_srcport = ParsePort(argv[2], pe->p_name);
151 if (tgt->f_srcport == 0)
157 if (argc >= 3 && !strcmp(argv[0], "dst")) {
158 tgt->f_dstop = filter_Nam2Op(argv[1]);
159 if (tgt->f_dstop == OP_NONE) {
160 log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
165 tgt->f_dstport = ParsePort(argv[2], pe->p_name);
166 if (tgt->f_dstport == 0)
172 if (pe && pe->p_proto == IPPROTO_TCP) {
173 for (; argc > 0; argc--, argv++)
174 if (!strcmp(*argv, "estab"))
176 else if (!strcmp(*argv, "syn"))
178 else if (!strcmp(*argv, "finrst"))
185 log_Printf(LogWARN, "ParseUdpOrTcp: bad src/dst port syntax: %s\n", *argv);
193 ParseGeneric(int argc, struct filterent *tgt)
196 * Filter currently is a catch-all. Requests are either permitted or
200 log_Printf(LogWARN, "ParseGeneric: Too many parameters\n");
203 tgt->f_srcop = tgt->f_dstop = OP_NONE;
209 addrtype(const char *addr)
211 if (!strncasecmp(addr, "MYADDR", 6) && (addr[6] == '\0' || addr[6] == '/'))
213 if (!strncasecmp(addr, "MYADDR6", 7) && (addr[7] == '\0' || addr[7] == '/'))
215 if (!strncasecmp(addr, "HISADDR", 7) && (addr[7] == '\0' || addr[7] == '/'))
217 if (!strncasecmp(addr, "HISADDR6", 8) && (addr[8] == '\0' || addr[8] == '/'))
219 if (!strncasecmp(addr, "DNS0", 4) && (addr[4] == '\0' || addr[4] == '/'))
221 if (!strncasecmp(addr, "DNS1", 4) && (addr[4] == '\0' || addr[4] == '/'))
228 addrstr(struct ncprange *addr, unsigned type)
240 return ncprange_ntoa(addr);
244 filter_Parse(struct ncp *ncp, int argc, char const *const *argv,
245 struct filterent *ofp)
250 int action, family, ruleno, val, width;
252 ruleno = strtol(*argv, &wp, 0);
253 if (*argv == wp || ruleno >= MAXFILTERS) {
254 log_Printf(LogWARN, "Parse: invalid filter number.\n");
258 for (ruleno = 0; ruleno < MAXFILTERS; ruleno++) {
259 ofp->f_action = A_NONE;
262 log_Printf(LogWARN, "Parse: filter cleared.\n");
268 log_Printf(LogWARN, "Parse: missing action.\n");
273 memset(&fe, '\0', sizeof fe);
275 val = strtol(*argv, &wp, 0);
276 if (!*wp && val >= 0 && val < MAXFILTERS) {
278 log_Printf(LogWARN, "Parse: Can only jump forward from rule %d\n",
283 } else if (!strcmp(*argv, "permit")) {
285 } else if (!strcmp(*argv, "deny")) {
287 } else if (!strcmp(*argv, "clear")) {
288 ofp->f_action = A_NONE;
291 log_Printf(LogWARN, "Parse: %s: bad action\n", *argv);
294 fe.f_action = action;
299 if (argc && argv[0][0] == '!' && !argv[0][1]) {
305 ncprange_init(&fe.f_src);
306 ncprange_init(&fe.f_dst);
310 else if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
312 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
314 } else if (strcasecmp(*argv, "any") == 0 ||
315 ncprange_aton(&fe.f_src, ncp, *argv)) {
316 family = ncprange_family(&fe.f_src);
317 if (!ncprange_getwidth(&fe.f_src, &width))
320 ncprange_init(&fe.f_src);
321 fe.f_srctype = addrtype(*argv);
325 if (strcasecmp(*argv, "any") == 0 ||
326 ncprange_aton(&fe.f_dst, ncp, *argv)) {
327 if (ncprange_family(&fe.f_dst) != AF_UNSPEC &&
328 ncprange_family(&fe.f_src) != AF_UNSPEC &&
329 family != ncprange_family(&fe.f_dst)) {
330 log_Printf(LogWARN, "Parse: src and dst address families differ\n");
333 if (!ncprange_getwidth(&fe.f_dst, &width))
336 ncprange_init(&fe.f_dst);
337 fe.f_dsttype = addrtype(*argv);
341 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
346 if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
347 log_Printf(LogWARN, "Parse: %s: Protocol expected\n", *argv);
355 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
363 if (argc >= 2 && strcmp(*argv, "timeout") == 0) {
364 fe.timeout = strtoul(argv[1], NULL, 10);
370 fe.f_proto = (pe == NULL) ? 0 : pe->p_proto;
372 switch (fe.f_proto) {
379 val = ParseUdpOrTcp(argc, argv, pe, &fe);
385 val = ParseIcmp(argc, argv, &fe);
388 val = ParseGeneric(argc, &fe);
392 log_Printf(LogDEBUG, "Parse: Src: %s\n", ncprange_ntoa(&fe.f_src));
393 log_Printf(LogDEBUG, "Parse: Dst: %s\n", ncprange_ntoa(&fe.f_dst));
394 log_Printf(LogDEBUG, "Parse: Proto: %d\n", fe.f_proto);
396 log_Printf(LogDEBUG, "Parse: src: %s (%d)\n",
397 filter_Op2Nam(fe.f_srcop), fe.f_srcport);
398 log_Printf(LogDEBUG, "Parse: dst: %s (%d)\n",
399 filter_Op2Nam(fe.f_dstop), fe.f_dstport);
400 log_Printf(LogDEBUG, "Parse: estab: %u\n", fe.f_estab);
401 log_Printf(LogDEBUG, "Parse: syn: %u\n", fe.f_syn);
402 log_Printf(LogDEBUG, "Parse: finrst: %u\n", fe.f_finrst);
411 filter_Set(struct cmdargs const *arg)
413 struct filter *filter;
415 if (arg->argc < arg->argn+2)
418 if (!strcmp(arg->argv[arg->argn], "in"))
419 filter = &arg->bundle->filter.in;
420 else if (!strcmp(arg->argv[arg->argn], "out"))
421 filter = &arg->bundle->filter.out;
422 else if (!strcmp(arg->argv[arg->argn], "dial"))
423 filter = &arg->bundle->filter.dial;
424 else if (!strcmp(arg->argv[arg->argn], "alive"))
425 filter = &arg->bundle->filter.alive;
427 log_Printf(LogWARN, "filter_Set: %s: Invalid filter name.\n",
428 arg->argv[arg->argn]);
432 filter_Parse(&arg->bundle->ncp, arg->argc - arg->argn - 1,
433 arg->argv + arg->argn + 1, filter->rule);
438 filter_Action2Nam(unsigned act)
440 static const char * const actname[] = { " none ", "permit ", " deny " };
443 if (act < MAXFILTERS) {
444 snprintf(buf, sizeof buf, "%6d ", act);
446 } else if (act >= A_NONE && act < A_NONE + sizeof(actname)/sizeof(char *))
447 return actname[act - A_NONE];
453 doShowFilter(struct filterent *fp, struct prompt *prompt)
458 for (n = 0; n < MAXFILTERS; n++, fp++) {
459 if (fp->f_action != A_NONE) {
460 prompt_Printf(prompt, " %2d %s", n, filter_Action2Nam(fp->f_action));
461 prompt_Printf(prompt, "%c ", fp->f_invert ? '!' : ' ');
463 if (ncprange_isset(&fp->f_src))
464 prompt_Printf(prompt, "%s ", addrstr(&fp->f_src, fp->f_srctype));
466 prompt_Printf(prompt, "any ");
468 if (ncprange_isset(&fp->f_dst))
469 prompt_Printf(prompt, "%s ", addrstr(&fp->f_dst, fp->f_dsttype));
471 prompt_Printf(prompt, "any ");
474 if ((pe = getprotobynumber(fp->f_proto)) == NULL)
475 prompt_Printf(prompt, "P:%d", fp->f_proto);
477 prompt_Printf(prompt, "%s", pe->p_name);
480 prompt_Printf(prompt, " src %s %d", filter_Op2Nam(fp->f_srcop),
483 prompt_Printf(prompt, " dst %s %d", filter_Op2Nam(fp->f_dstop),
486 prompt_Printf(prompt, " estab");
488 prompt_Printf(prompt, " syn");
490 prompt_Printf(prompt, " finrst");
492 prompt_Printf(prompt, "all");
493 if (fp->timeout != 0)
494 prompt_Printf(prompt, " timeout %u", fp->timeout);
495 prompt_Printf(prompt, "\n");
501 filter_Show(struct cmdargs const *arg)
503 if (arg->argc > arg->argn+1)
506 if (arg->argc == arg->argn+1) {
507 struct filter *filter;
509 if (!strcmp(arg->argv[arg->argn], "in"))
510 filter = &arg->bundle->filter.in;
511 else if (!strcmp(arg->argv[arg->argn], "out"))
512 filter = &arg->bundle->filter.out;
513 else if (!strcmp(arg->argv[arg->argn], "dial"))
514 filter = &arg->bundle->filter.dial;
515 else if (!strcmp(arg->argv[arg->argn], "alive"))
516 filter = &arg->bundle->filter.alive;
519 doShowFilter(filter->rule, arg->prompt);
521 struct filter *filter[4];
524 filter[0] = &arg->bundle->filter.in;
525 filter[1] = &arg->bundle->filter.out;
526 filter[2] = &arg->bundle->filter.dial;
527 filter[3] = &arg->bundle->filter.alive;
528 for (f = 0; f < 4; f++) {
530 prompt_Printf(arg->prompt, "\n");
531 prompt_Printf(arg->prompt, "%s:\n", filter[f]->name);
532 doShowFilter(filter[f]->rule, arg->prompt);
539 static const char * const opname[] = {"none", "eq", "gt", "lt"};
542 filter_Op2Nam(unsigned op)
544 if (op >= sizeof opname / sizeof opname[0])
551 filter_Nam2Op(const char *cp)
555 for (op = sizeof opname / sizeof opname[0] - 1; op; op--)
556 if (!strcasecmp(cp, opname[op]))
563 filter_AdjustAddr(struct filter *filter, struct ncpaddr *local,
564 struct ncpaddr *remote, struct in_addr *dns)
566 struct filterent *fp;
569 for (fp = filter->rule, n = 0; n < MAXFILTERS; fp++, n++)
570 if (fp->f_action != A_NONE) {
572 if (fp->f_srctype == T_MYADDR && ncpaddr_family(local) == AF_INET)
573 ncprange_sethost(&fp->f_src, local);
574 if (fp->f_dsttype == T_MYADDR && ncpaddr_family(local) == AF_INET)
575 ncprange_sethost(&fp->f_dst, local);
577 if (fp->f_srctype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
578 ncprange_sethost(&fp->f_src, local);
579 if (fp->f_dsttype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
580 ncprange_sethost(&fp->f_dst, local);
584 if (fp->f_srctype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
585 ncprange_sethost(&fp->f_src, remote);
586 if (fp->f_dsttype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
587 ncprange_sethost(&fp->f_dst, remote);
589 if (fp->f_srctype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
590 ncprange_sethost(&fp->f_src, remote);
591 if (fp->f_dsttype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
592 ncprange_sethost(&fp->f_dst, remote);
596 if (fp->f_srctype == T_DNS0)
597 ncprange_setip4host(&fp->f_src, dns[0]);
598 if (fp->f_dsttype == T_DNS0)
599 ncprange_setip4host(&fp->f_dst, dns[0]);
600 if (fp->f_srctype == T_DNS1)
601 ncprange_setip4host(&fp->f_src, dns[1]);
602 if (fp->f_dsttype == T_DNS1)
603 ncprange_setip4host(&fp->f_dst, dns[1]);