8a16b7a18f
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459 lines
10 KiB
C
459 lines
10 KiB
C
/* $KAME: ip6addrctl.c,v 1.3 2003/12/16 08:14:28 suz Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 2001 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/queue.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <limits.h>
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#include <string.h>
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#include <err.h>
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static char *configfile;
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struct policyqueue {
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TAILQ_ENTRY(policyqueue) pc_entry;
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struct in6_addrpolicy pc_policy;
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};
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TAILQ_HEAD(policyhead, policyqueue);
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static struct policyhead policyhead;
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static void usage(void);
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static void get_policy(void);
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static void dump_policy(void);
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static int mask2plen(struct sockaddr_in6 *);
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static int parse_prefix(const char *, struct in6_addrpolicy *);
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static void make_policy_fromfile(char *);
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static void plen2mask(struct sockaddr_in6 *, int);
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static void set_policy(void);
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static void add_policy(char *, char *, char *);
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static void delete_policy(char *);
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static void flush_policy(void);
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int
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main(int argc, char *argv[])
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{
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TAILQ_INIT(&policyhead);
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if (argc == 1 || strcasecmp(argv[1], "show") == 0) {
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get_policy();
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dump_policy();
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} else if (strcasecmp(argv[1], "add") == 0) {
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if (argc < 5)
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usage();
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add_policy(argv[2], argv[3], argv[4]);
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} else if (strcasecmp(argv[1], "delete") == 0) {
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if (argc < 3)
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usage();
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delete_policy(argv[2]);
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} else if (strcasecmp(argv[1], "flush") == 0) {
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get_policy();
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flush_policy();
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} else if (strcasecmp(argv[1], "install") == 0) {
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if (argc < 3)
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usage();
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configfile = argv[2];
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make_policy_fromfile(configfile);
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set_policy();
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} else
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usage();
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exit(0);
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}
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static void
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get_policy(void)
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{
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int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
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size_t l;
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struct in6_addrpolicy *buf;
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struct in6_addrpolicy *pol, *ep;
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if (sysctl(mib, nitems(mib), NULL, &l, NULL, 0) < 0) {
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err(1, "sysctl(IPV6CTL_ADDRCTLPOLICY)");
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/* NOTREACHED */
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}
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if (l == 0) {
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printf("no source-address-selection policy is installed\n");
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return;
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}
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if ((buf = malloc(l)) == NULL) {
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errx(1, "malloc failed");
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/* NOTREACHED */
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}
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if (sysctl(mib, nitems(mib), buf, &l, NULL, 0) < 0) {
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err(1, "sysctl(IPV6CTL_ADDRCTLPOLICY)");
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/* NOTREACHED */
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}
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ep = buf + l/sizeof(*buf);
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for (pol = buf; pol + 1 <= ep; pol++) {
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struct policyqueue *new;
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if ((new = malloc(sizeof(*new))) == NULL)
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errx(1, "malloc failed\n");
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new->pc_policy = *pol;
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TAILQ_INSERT_TAIL(&policyhead, new, pc_entry);
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}
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free(buf);
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}
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static void
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dump_policy(void)
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{
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size_t addrlen;
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char addrbuf[NI_MAXHOST];
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struct in6_addrpolicy *pol;
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struct policyqueue *ent;
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int plen, first = 1;
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for (ent = TAILQ_FIRST(&policyhead); ent;
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ent = TAILQ_NEXT(ent, pc_entry)) {
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pol = &ent->pc_policy;
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if (first) {
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printf("%-30s %5s %5s %8s\n",
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"Prefix", "Prec", "Label", "Use");
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first = 0;
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}
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if ((getnameinfo((struct sockaddr *)&pol->addr,
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sizeof(pol->addr), addrbuf, sizeof(addrbuf),
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NULL, 0, NI_NUMERICHOST))) {
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warnx("getnameinfo for prefix address failed");
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continue;
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}
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if ((plen = mask2plen(&pol->addrmask)) < 0) {
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warnx("invalid address mask");
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continue;
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}
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addrlen = strlen(addrbuf);
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if (addrlen + sizeof("/128") < sizeof(addrbuf)) {
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snprintf(&addrbuf[addrlen],
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sizeof(addrbuf) - addrlen - 1,
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"/%d", plen);
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printf("%-30s", addrbuf);
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} else /* XXX */
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printf("%s/%d", addrbuf, plen);
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printf(" %5d %5d %8llu\n", pol->preced, pol->label,
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(unsigned long long)pol->use);
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}
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}
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#define SKIP_WHITE(p, emptyok) \
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do { \
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while((*(p) == ' ' || *(p) == '\t')) \
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(p)++; \
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if ((*(p) == '\0' || (*(p) == '\n')) && !(emptyok)) \
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goto bad; \
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} while (0);
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#define SKIP_WORD(p) \
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do { \
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while(*(p) != ' ' && *(p) != '\t') \
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(p)++; \
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if (*(p) == '\0' || *(p) == '\n') \
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goto bad; \
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} while (0);
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static void
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make_policy_fromfile(char *conf)
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{
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char line[_POSIX2_LINE_MAX], *cp;
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char *addrstr;
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FILE *fp;
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int count = 0;
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struct in6_addrpolicy pol0;
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struct policyqueue *new;
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if ((fp = fopen(conf, "r")) == NULL)
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err(1, "fopen: %s", conf);
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while(fgets(line, sizeof(line), fp)) {
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count++;
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cp = line;
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memset(&pol0, 0, sizeof(pol0));
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/* get prefix */
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SKIP_WHITE(cp, 1);
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if (*cp == '\n') /* empty line */
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continue;
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if (*cp == '#')
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continue;
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addrstr = cp;
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if (parse_prefix((const char *)addrstr, &pol0))
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goto bad;
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/* get precedence value */
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SKIP_WORD(cp);
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SKIP_WHITE(cp, 0);
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pol0.preced = atoi(cp);
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/* get label */
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SKIP_WORD(cp);
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SKIP_WHITE(cp, 0);
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pol0.label = atoi(cp);
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/* parse succeeded. make a control buffer entry. */
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if ((new = malloc(sizeof(*new))) == NULL)
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errx(1, "malloc failed\n");
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memset(new, 0, sizeof(*new));
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new->pc_policy = pol0;
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TAILQ_INSERT_TAIL(&policyhead, new, pc_entry);
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}
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fclose(fp);
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return;
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bad:
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errx(1, "parse failed at line %d", count);
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/* NOTREACHED */
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}
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static int
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parse_prefix(const char *prefix0, struct in6_addrpolicy *pol)
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{
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int e = 0, plen;
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char *prefix, *plenstr;
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struct addrinfo hints, *res;
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if ((prefix = strdup(prefix0)) == NULL)
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errx(1, "strdup failed");
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if ((plenstr = strchr(prefix, '/')) == NULL) {
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e = -1;
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goto end;
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}
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*plenstr = '\0';
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_NUMERICHOST;
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hints.ai_family = AF_INET6;
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if ((e = getaddrinfo(prefix, NULL, &hints, &res)) != 0) {
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warnx("getaddrinfo failed for %s: %s", prefix,
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gai_strerror(e));
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goto end;
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}
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memcpy(&pol->addr, res->ai_addr, res->ai_addrlen);
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freeaddrinfo(res);
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plen = atoi(plenstr + 1);
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if (plen < 0 || plen > 128) {
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warnx("invalid prefix length: %d", plen);
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e = -1;
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goto end;
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}
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plen2mask(&pol->addrmask, plen);
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end:
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free(prefix);
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return(e);
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}
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static void
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plen2mask(struct sockaddr_in6 *mask, int plen)
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{
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u_char *cp = (unsigned char *)&mask->sin6_addr;
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memset(mask, 0, sizeof(*mask));
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mask->sin6_family = AF_INET6; /* just in case */
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mask->sin6_len = sizeof(*mask);
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for(; plen >= 8; plen -= 8)
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*cp++ = 0xff;
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if (plen > 0)
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*cp = (0xff << (8 - plen));
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}
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static void
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set_policy(void)
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{
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struct policyqueue *ent;
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int s;
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if ((s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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err(1, "socket(UDP)");
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for (ent = TAILQ_FIRST(&policyhead); ent;
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ent = TAILQ_NEXT(ent, pc_entry)) {
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if (ioctl(s, SIOCAADDRCTL_POLICY, &ent->pc_policy))
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warn("ioctl(SIOCAADDRCTL_POLICY)");
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}
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close(s);
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}
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static int
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mask2plen(struct sockaddr_in6 *mask)
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{
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int masklen, final = 0;
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u_char *p, *lim;
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masklen = 0;
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lim = (u_char *)(mask + 1);
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for (p = (u_char *)(&mask->sin6_addr); p < lim; p++) {
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if (final && *p) {
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goto bad;
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}
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switch (*p & 0xff) {
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case 0xff:
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masklen += 8;
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break;
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case 0xfe:
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masklen += 7;
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final++;
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break;
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case 0xfc:
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masklen += 6;
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final++;
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break;
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case 0xf8:
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masklen += 5;
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final++;
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break;
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case 0xf0:
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masklen += 4;
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final++;
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break;
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case 0xe0:
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masklen += 3;
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final++;
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break;
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case 0xc0:
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masklen += 2;
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final++;
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break;
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case 0x80:
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masklen += 1;
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final++;
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break;
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case 0x00:
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final++;
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break;
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default:
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goto bad;
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break;
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}
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}
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return(masklen);
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bad:
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return(-1);
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}
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static void
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add_policy(char *prefix, char *prec, char *label)
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{
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struct in6_addrpolicy p;
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int s;
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memset(&p, 0, sizeof(p));
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if (parse_prefix((const char *)prefix, &p))
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errx(1, "bad prefix: %s", prefix);
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p.preced = atoi(prec);
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p.label = atoi(label);
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if ((s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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err(1, "socket(UDP)");
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if (ioctl(s, SIOCAADDRCTL_POLICY, &p))
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err(1, "ioctl(SIOCAADDRCTL_POLICY)");
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close(s);
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}
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static void
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delete_policy(char *prefix)
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{
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struct in6_addrpolicy p;
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int s;
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memset(&p, 0, sizeof(p));
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if (parse_prefix((const char *)prefix, &p))
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errx(1, "bad prefix: %s", prefix);
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if ((s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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err(1, "socket(UDP)");
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if (ioctl(s, SIOCDADDRCTL_POLICY, &p))
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err(1, "ioctl(SIOCDADDRCTL_POLICY)");
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close(s);
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}
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static void
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flush_policy(void)
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{
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struct policyqueue *ent;
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int s;
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if ((s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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err(1, "socket(UDP)");
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for (ent = TAILQ_FIRST(&policyhead); ent;
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ent = TAILQ_NEXT(ent, pc_entry)) {
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if (ioctl(s, SIOCDADDRCTL_POLICY, &ent->pc_policy))
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warn("ioctl(SIOCDADDRCTL_POLICY)");
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}
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close(s);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: ip6addrctl [show]\n");
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fprintf(stderr, " ip6addrctl add "
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"<prefix> <precedence> <label>\n");
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fprintf(stderr, " ip6addrctl delete <prefix>\n");
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fprintf(stderr, " ip6addrctl flush\n");
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fprintf(stderr, " ip6addrctl install <configfile>\n");
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exit(1);
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}
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