2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
4 * Internet Initiative Japan, Inc (IIJ)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/param.h>
32 #include <netinet/in.h>
34 #include <netinet/in_systm.h>
35 #include <netinet/ip.h>
36 #include <sys/socket.h>
51 #include "throughput.h"
58 #include "slcompress.h"
62 #include "descriptor.h"
72 static int filter_Nam2Op(const char *);
75 ParsePort(const char *service, const char *proto)
77 struct servent *servent;
81 servent = getservbyname(service, proto);
83 return ntohs(servent->s_port);
85 port = strtol(service, &cp, 0);
87 log_Printf(LogWARN, "ParsePort: %s is not a port name or number.\n",
95 * ICMP Syntax: src eq icmp_message_type
98 ParseIcmp(int argc, char const *const *argv, const struct protoent *pe,
99 struct filterent *tgt)
106 /* permit/deny all ICMP types */
107 tgt->f_srcop = tgt->f_dstop = OP_NONE;
111 if (!strcmp(*argv, "src") && !strcmp(argv[1], "eq")) {
112 type = strtol(argv[2], &cp, 0);
114 log_Printf(LogWARN, "ParseIcmp: type is expected.\n");
117 tgt->f_srcop = OP_EQ;
118 tgt->f_srcport = type;
119 tgt->f_dstop = OP_NONE;
124 log_Printf(LogWARN, "ParseIcmp: bad icmp syntax.\n");
131 * UDP Syntax: [src op port] [dst op port]
134 ParseUdpOrTcp(int argc, char const *const *argv, const struct protoent *pe,
135 struct filterent *tgt)
137 tgt->f_srcop = tgt->f_dstop = OP_NONE;
138 tgt->f_estab = tgt->f_syn = tgt->f_finrst = 0;
140 if (argc >= 3 && !strcmp(*argv, "src")) {
141 tgt->f_srcop = filter_Nam2Op(argv[1]);
142 if (tgt->f_srcop == OP_NONE) {
143 log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
148 tgt->f_srcport = ParsePort(argv[2], pe->p_name);
149 if (tgt->f_srcport == 0)
155 if (argc >= 3 && !strcmp(argv[0], "dst")) {
156 tgt->f_dstop = filter_Nam2Op(argv[1]);
157 if (tgt->f_dstop == OP_NONE) {
158 log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
163 tgt->f_dstport = ParsePort(argv[2], pe->p_name);
164 if (tgt->f_dstport == 0)
170 if (pe && pe->p_proto == IPPROTO_TCP) {
171 for (; argc > 0; argc--, argv++)
172 if (!strcmp(*argv, "estab"))
174 else if (!strcmp(*argv, "syn"))
176 else if (!strcmp(*argv, "finrst"))
183 log_Printf(LogWARN, "ParseUdpOrTcp: bad src/dst port syntax: %s\n", *argv);
191 ParseGeneric(int argc, char const * const *argv, const struct protoent *pe,
192 struct filterent *tgt)
195 * Filter currently is a catch-all. Requests are either permitted or
199 log_Printf(LogWARN, "ParseGeneric: Too many parameters\n");
202 tgt->f_srcop = tgt->f_dstop = OP_NONE;
208 addrtype(const char *addr)
210 if (!strncasecmp(addr, "MYADDR", 6) && (addr[6] == '\0' || addr[6] == '/'))
212 if (!strncasecmp(addr, "MYADDR6", 7) && (addr[7] == '\0' || addr[7] == '/'))
214 if (!strncasecmp(addr, "HISADDR", 7) && (addr[7] == '\0' || addr[7] == '/'))
216 if (!strncasecmp(addr, "HISADDR6", 8) && (addr[8] == '\0' || addr[8] == '/'))
218 if (!strncasecmp(addr, "DNS0", 4) && (addr[4] == '\0' || addr[4] == '/'))
220 if (!strncasecmp(addr, "DNS1", 4) && (addr[4] == '\0' || addr[4] == '/'))
227 addrstr(struct ncprange *addr, unsigned type)
239 return ncprange_ntoa(addr);
243 filter_Parse(struct ncp *ncp, int argc, char const *const *argv,
244 struct filterent *ofp)
249 int action, family, ruleno, val, width;
251 ruleno = strtol(*argv, &wp, 0);
252 if (*argv == wp || ruleno >= MAXFILTERS) {
253 log_Printf(LogWARN, "Parse: invalid filter number.\n");
257 for (ruleno = 0; ruleno < MAXFILTERS; ruleno++) {
258 ofp->f_action = A_NONE;
261 log_Printf(LogWARN, "Parse: filter cleared.\n");
267 log_Printf(LogWARN, "Parse: missing action.\n");
272 memset(&fe, '\0', sizeof fe);
274 val = strtol(*argv, &wp, 0);
275 if (!*wp && val >= 0 && val < MAXFILTERS) {
277 log_Printf(LogWARN, "Parse: Can only jump forward from rule %d\n",
282 } else if (!strcmp(*argv, "permit")) {
284 } else if (!strcmp(*argv, "deny")) {
286 } else if (!strcmp(*argv, "clear")) {
287 ofp->f_action = A_NONE;
290 log_Printf(LogWARN, "Parse: %s: bad action\n", *argv);
293 fe.f_action = action;
298 if (argc && argv[0][0] == '!' && !argv[0][1]) {
304 ncprange_init(&fe.f_src);
305 ncprange_init(&fe.f_dst);
309 else if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
311 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
313 } else if (strcasecmp(*argv, "any") == 0 ||
314 ncprange_aton(&fe.f_src, ncp, *argv)) {
315 family = ncprange_family(&fe.f_src);
316 if (!ncprange_getwidth(&fe.f_src, &width))
319 ncprange_init(&fe.f_src);
320 fe.f_srctype = addrtype(*argv);
324 if (strcasecmp(*argv, "any") == 0 ||
325 ncprange_aton(&fe.f_dst, ncp, *argv)) {
326 if (ncprange_family(&fe.f_dst) != AF_UNSPEC &&
327 ncprange_family(&fe.f_src) != AF_UNSPEC &&
328 family != ncprange_family(&fe.f_dst)) {
329 log_Printf(LogWARN, "Parse: src and dst address families differ\n");
332 if (!ncprange_getwidth(&fe.f_dst, &width))
335 ncprange_init(&fe.f_dst);
336 fe.f_dsttype = addrtype(*argv);
340 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
345 if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
346 log_Printf(LogWARN, "Parse: %s: Protocol expected\n", *argv);
354 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
362 if (argc >= 2 && strcmp(*argv, "timeout") == 0) {
363 fe.timeout = strtoul(argv[1], NULL, 10);
369 fe.f_proto = (pe == NULL) ? 0 : pe->p_proto;
371 switch (fe.f_proto) {
378 val = ParseUdpOrTcp(argc, argv, pe, &fe);
384 val = ParseIcmp(argc, argv, pe, &fe);
387 val = ParseGeneric(argc, argv, pe, &fe);
391 log_Printf(LogDEBUG, "Parse: Src: %s\n", ncprange_ntoa(&fe.f_src));
392 log_Printf(LogDEBUG, "Parse: Dst: %s\n", ncprange_ntoa(&fe.f_dst));
393 log_Printf(LogDEBUG, "Parse: Proto: %d\n", fe.f_proto);
395 log_Printf(LogDEBUG, "Parse: src: %s (%d)\n",
396 filter_Op2Nam(fe.f_srcop), fe.f_srcport);
397 log_Printf(LogDEBUG, "Parse: dst: %s (%d)\n",
398 filter_Op2Nam(fe.f_dstop), fe.f_dstport);
399 log_Printf(LogDEBUG, "Parse: estab: %u\n", fe.f_estab);
400 log_Printf(LogDEBUG, "Parse: syn: %u\n", fe.f_syn);
401 log_Printf(LogDEBUG, "Parse: finrst: %u\n", fe.f_finrst);
410 filter_Set(struct cmdargs const *arg)
412 struct filter *filter;
414 if (arg->argc < arg->argn+2)
417 if (!strcmp(arg->argv[arg->argn], "in"))
418 filter = &arg->bundle->filter.in;
419 else if (!strcmp(arg->argv[arg->argn], "out"))
420 filter = &arg->bundle->filter.out;
421 else if (!strcmp(arg->argv[arg->argn], "dial"))
422 filter = &arg->bundle->filter.dial;
423 else if (!strcmp(arg->argv[arg->argn], "alive"))
424 filter = &arg->bundle->filter.alive;
426 log_Printf(LogWARN, "filter_Set: %s: Invalid filter name.\n",
427 arg->argv[arg->argn]);
431 filter_Parse(&arg->bundle->ncp, arg->argc - arg->argn - 1,
432 arg->argv + arg->argn + 1, filter->rule);
437 filter_Action2Nam(int act)
439 static const char * const actname[] = { " none ", "permit ", " deny " };
442 if (act >= 0 && act < MAXFILTERS) {
443 snprintf(buf, sizeof buf, "%6d ", act);
445 } else if (act >= A_NONE && act < A_NONE + sizeof(actname)/sizeof(char *))
446 return actname[act - A_NONE];
452 doShowFilter(struct filterent *fp, struct prompt *prompt)
457 for (n = 0; n < MAXFILTERS; n++, fp++) {
458 if (fp->f_action != A_NONE) {
459 prompt_Printf(prompt, " %2d %s", n, filter_Action2Nam(fp->f_action));
460 prompt_Printf(prompt, "%c ", fp->f_invert ? '!' : ' ');
462 if (ncprange_isset(&fp->f_src))
463 prompt_Printf(prompt, "%s ", addrstr(&fp->f_src, fp->f_srctype));
465 prompt_Printf(prompt, "any ");
467 if (ncprange_isset(&fp->f_dst))
468 prompt_Printf(prompt, "%s ", addrstr(&fp->f_dst, fp->f_dsttype));
470 prompt_Printf(prompt, "any ");
473 if ((pe = getprotobynumber(fp->f_proto)) == NULL)
474 prompt_Printf(prompt, "P:%d", fp->f_proto);
476 prompt_Printf(prompt, "%s", pe->p_name);
479 prompt_Printf(prompt, " src %s %d", filter_Op2Nam(fp->f_srcop),
482 prompt_Printf(prompt, " dst %s %d", filter_Op2Nam(fp->f_dstop),
485 prompt_Printf(prompt, " estab");
487 prompt_Printf(prompt, " syn");
489 prompt_Printf(prompt, " finrst");
491 prompt_Printf(prompt, "all");
492 if (fp->timeout != 0)
493 prompt_Printf(prompt, " timeout %u", fp->timeout);
494 prompt_Printf(prompt, "\n");
500 filter_Show(struct cmdargs const *arg)
502 if (arg->argc > arg->argn+1)
505 if (arg->argc == arg->argn+1) {
506 struct filter *filter;
508 if (!strcmp(arg->argv[arg->argn], "in"))
509 filter = &arg->bundle->filter.in;
510 else if (!strcmp(arg->argv[arg->argn], "out"))
511 filter = &arg->bundle->filter.out;
512 else if (!strcmp(arg->argv[arg->argn], "dial"))
513 filter = &arg->bundle->filter.dial;
514 else if (!strcmp(arg->argv[arg->argn], "alive"))
515 filter = &arg->bundle->filter.alive;
518 doShowFilter(filter->rule, arg->prompt);
520 struct filter *filter[4];
523 filter[0] = &arg->bundle->filter.in;
524 filter[1] = &arg->bundle->filter.out;
525 filter[2] = &arg->bundle->filter.dial;
526 filter[3] = &arg->bundle->filter.alive;
527 for (f = 0; f < 4; f++) {
529 prompt_Printf(arg->prompt, "\n");
530 prompt_Printf(arg->prompt, "%s:\n", filter[f]->name);
531 doShowFilter(filter[f]->rule, arg->prompt);
538 static const char * const opname[] = {"none", "eq", "gt", "lt"};
541 filter_Op2Nam(int op)
543 if (op >= sizeof opname / sizeof opname[0])
550 filter_Nam2Op(const char *cp)
554 for (op = sizeof opname / sizeof opname[0] - 1; op; op--)
555 if (!strcasecmp(cp, opname[op]))
562 filter_AdjustAddr(struct filter *filter, struct ncpaddr *local,
563 struct ncpaddr *remote, struct in_addr *dns)
565 struct filterent *fp;
568 for (fp = filter->rule, n = 0; n < MAXFILTERS; fp++, n++)
569 if (fp->f_action != A_NONE) {
571 if (fp->f_srctype == T_MYADDR && ncpaddr_family(local) == AF_INET)
572 ncprange_sethost(&fp->f_src, local);
573 if (fp->f_dsttype == T_MYADDR && ncpaddr_family(local) == AF_INET)
574 ncprange_sethost(&fp->f_dst, local);
576 if (fp->f_srctype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
577 ncprange_sethost(&fp->f_src, local);
578 if (fp->f_dsttype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
579 ncprange_sethost(&fp->f_dst, local);
583 if (fp->f_srctype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
584 ncprange_sethost(&fp->f_src, remote);
585 if (fp->f_dsttype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
586 ncprange_sethost(&fp->f_dst, remote);
588 if (fp->f_srctype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
589 ncprange_sethost(&fp->f_src, remote);
590 if (fp->f_dsttype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
591 ncprange_sethost(&fp->f_dst, remote);
595 if (fp->f_srctype == T_DNS0)
596 ncprange_setip4host(&fp->f_src, dns[0]);
597 if (fp->f_dsttype == T_DNS0)
598 ncprange_setip4host(&fp->f_dst, dns[0]);
599 if (fp->f_srctype == T_DNS1)
600 ncprange_setip4host(&fp->f_src, dns[1]);
601 if (fp->f_dsttype == T_DNS1)
602 ncprange_setip4host(&fp->f_dst, dns[1]);