db82af41db
Options for DNS Configuration) into rtadvd(8) and rtsold(8). DNS information received by rtsold(8) will go to resolv.conf(5) by resolvconf(8) script. This is based on work by J.R. Oldroyd (kern/156259) but revised extensively[1]. - rtadvd(8) now supports "noifprefix" to disable gathering on-link prefixes from interfaces when no "addr" is specified[2]. An entry in rtadvd.conf with "noifprefix" + no "addr" generates an RA message with no prefix information option. - rtadvd(8) now supports RTM_IFANNOUNCE message to fix crashes when an interface is added or removed. - Correct bogus ND_OPT_ROUTE_INFO value to one in RFC 4191. Reviewed by: bz[1] PR: kern/156259 [1] PR: bin/152458 [2]
827 lines
22 KiB
C
827 lines
22 KiB
C
/* $KAME: rtsol.c,v 1.27 2003/10/05 00:09:36 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* Copyright (C) 2011 Hiroki Sato
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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/param.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#define __BSD_VISIBLE 1 /* IN6ADDR_LINKLOCAL_ALLROUTERS_INIT */
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#include <netinet/in.h>
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#undef __BSD_VISIBLE
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <time.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include "rtsold.h"
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static struct msghdr rcvmhdr;
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static struct msghdr sndmhdr;
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static struct iovec rcviov[2];
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static struct iovec sndiov[2];
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static struct sockaddr_in6 from;
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static int rcvcmsglen;
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int rssock;
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struct ifinfo_head_t ifinfo_head =
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TAILQ_HEAD_INITIALIZER(ifinfo_head);
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static const struct sockaddr_in6 sin6_allrouters = {
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.sin6_len = sizeof(sin6_allrouters),
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.sin6_family = AF_INET6,
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.sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
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};
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static void call_script(const int, const char *const *, void *);
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static size_t dname_labeldec(char *, size_t, const char *);
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static int safefile(const char *);
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#define _ARGS_OTHER otherconf_script, ifi->ifname
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#define _ARGS_RESADD resolvconf_script, "-a", ifi->ifname
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#define _ARGS_RESDEL resolvconf_script, "-d", ifi->ifname
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#define CALL_SCRIPT(name, sm_head) \
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do { \
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const char *const sarg[] = { _ARGS_##name, NULL }; \
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call_script(sizeof(sarg), sarg, sm_head); \
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} while(0)
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#define ELM_MALLOC(p,error_action) \
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do { \
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p = malloc(sizeof(*p)); \
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if (p == NULL) { \
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warnmsg(LOG_ERR, __func__, "malloc failed: %s", \
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strerror(errno)); \
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error_action; \
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} \
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memset(p, 0, sizeof(*p)); \
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} while(0)
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int
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sockopen(void)
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{
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static u_char *rcvcmsgbuf = NULL, *sndcmsgbuf = NULL;
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int sndcmsglen, on;
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static u_char answer[1500];
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struct icmp6_filter filt;
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sndcmsglen = rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
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CMSG_SPACE(sizeof(int));
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if (rcvcmsgbuf == NULL && (rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
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warnmsg(LOG_ERR, __func__,
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"malloc for receive msghdr failed");
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return (-1);
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}
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if (sndcmsgbuf == NULL && (sndcmsgbuf = malloc(sndcmsglen)) == NULL) {
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warnmsg(LOG_ERR, __func__,
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"malloc for send msghdr failed");
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return (-1);
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}
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if ((rssock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
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warnmsg(LOG_ERR, __func__, "socket: %s", strerror(errno));
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return (-1);
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}
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/* specify to tell receiving interface */
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on = 1;
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if (setsockopt(rssock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
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sizeof(on)) < 0) {
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warnmsg(LOG_ERR, __func__, "IPV6_RECVPKTINFO: %s",
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strerror(errno));
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exit(1);
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}
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/* specify to tell value of hoplimit field of received IP6 hdr */
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on = 1;
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if (setsockopt(rssock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
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sizeof(on)) < 0) {
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warnmsg(LOG_ERR, __func__, "IPV6_RECVHOPLIMIT: %s",
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strerror(errno));
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exit(1);
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}
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/* specfiy to accept only router advertisements on the socket */
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ICMP6_FILTER_SETBLOCKALL(&filt);
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ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
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if (setsockopt(rssock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
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sizeof(filt)) == -1) {
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warnmsg(LOG_ERR, __func__, "setsockopt(ICMP6_FILTER): %s",
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strerror(errno));
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return(-1);
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}
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/* initialize msghdr for receiving packets */
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rcviov[0].iov_base = (caddr_t)answer;
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rcviov[0].iov_len = sizeof(answer);
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rcvmhdr.msg_name = (caddr_t)&from;
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rcvmhdr.msg_iov = rcviov;
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rcvmhdr.msg_iovlen = 1;
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rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
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/* initialize msghdr for sending packets */
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sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
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sndmhdr.msg_iov = sndiov;
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sndmhdr.msg_iovlen = 1;
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sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
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sndmhdr.msg_controllen = sndcmsglen;
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return (rssock);
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}
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void
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sendpacket(struct ifinfo *ifi)
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{
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struct in6_pktinfo *pi;
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struct cmsghdr *cm;
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int hoplimit = 255;
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ssize_t i;
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struct sockaddr_in6 dst;
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dst = sin6_allrouters;
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dst.sin6_scope_id = ifi->linkid;
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sndmhdr.msg_name = (caddr_t)&dst;
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sndmhdr.msg_iov[0].iov_base = (caddr_t)ifi->rs_data;
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sndmhdr.msg_iov[0].iov_len = ifi->rs_datalen;
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cm = CMSG_FIRSTHDR(&sndmhdr);
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/* specify the outgoing interface */
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_PKTINFO;
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cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
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pi = (struct in6_pktinfo *)CMSG_DATA(cm);
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memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
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pi->ipi6_ifindex = ifi->sdl->sdl_index;
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/* specify the hop limit of the packet */
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cm = CMSG_NXTHDR(&sndmhdr, cm);
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_HOPLIMIT;
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cm->cmsg_len = CMSG_LEN(sizeof(int));
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memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
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warnmsg(LOG_DEBUG, __func__,
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"send RS on %s, whose state is %d",
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ifi->ifname, ifi->state);
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i = sendmsg(rssock, &sndmhdr, 0);
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if (i < 0 || (size_t)i != ifi->rs_datalen) {
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/*
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* ENETDOWN is not so serious, especially when using several
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* network cards on a mobile node. We ignore it.
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*/
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if (errno != ENETDOWN || dflag > 0)
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warnmsg(LOG_ERR, __func__, "sendmsg on %s: %s",
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ifi->ifname, strerror(errno));
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}
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/* update counter */
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ifi->probes++;
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}
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void
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rtsol_input(int s)
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{
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u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
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int l, ifindex = 0, *hlimp = NULL;
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ssize_t msglen;
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struct in6_pktinfo *pi = NULL;
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struct ifinfo *ifi = NULL;
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struct ra_opt *rao = NULL;
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struct icmp6_hdr *icp;
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struct nd_router_advert *nd_ra;
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struct cmsghdr *cm;
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char *raoptp;
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char *p;
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struct in6_addr *addr;
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struct nd_opt_hdr *ndo;
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struct nd_opt_rdnss *rdnss;
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struct nd_opt_dnssl *dnssl;
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size_t len;
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char nsbuf[INET6_ADDRSTRLEN + 1 + IFNAMSIZ + 1];
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char dname[NI_MAXHOST];
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struct timeval now;
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struct timeval lifetime;
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/* get message. namelen and controllen must always be initialized. */
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rcvmhdr.msg_namelen = sizeof(from);
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rcvmhdr.msg_controllen = rcvcmsglen;
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if ((msglen = recvmsg(s, &rcvmhdr, 0)) < 0) {
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warnmsg(LOG_ERR, __func__, "recvmsg: %s", strerror(errno));
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return;
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}
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/* extract optional information via Advanced API */
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for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr); cm;
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cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
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if (cm->cmsg_level == IPPROTO_IPV6 &&
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cm->cmsg_type == IPV6_PKTINFO &&
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cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
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pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
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ifindex = pi->ipi6_ifindex;
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}
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if (cm->cmsg_level == IPPROTO_IPV6 &&
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cm->cmsg_type == IPV6_HOPLIMIT &&
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cm->cmsg_len == CMSG_LEN(sizeof(int)))
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hlimp = (int *)CMSG_DATA(cm);
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}
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if (ifindex == 0) {
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warnmsg(LOG_ERR, __func__,
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"failed to get receiving interface");
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return;
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}
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if (hlimp == NULL) {
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warnmsg(LOG_ERR, __func__,
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"failed to get receiving hop limit");
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return;
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}
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if ((size_t)msglen < sizeof(struct nd_router_advert)) {
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warnmsg(LOG_INFO, __func__,
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"packet size(%zd) is too short", msglen);
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return;
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}
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icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
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if (icp->icmp6_type != ND_ROUTER_ADVERT) {
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/*
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* this should not happen because we configured a filter
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* that only passes RAs on the receiving socket.
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*/
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warnmsg(LOG_ERR, __func__,
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"invalid icmp type(%d) from %s on %s", icp->icmp6_type,
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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if (icp->icmp6_code != 0) {
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warnmsg(LOG_INFO, __func__,
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"invalid icmp code(%d) from %s on %s", icp->icmp6_code,
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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if (*hlimp != 255) {
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warnmsg(LOG_INFO, __func__,
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"invalid RA with hop limit(%d) from %s on %s",
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*hlimp,
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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if (pi && !IN6_IS_ADDR_LINKLOCAL(&from.sin6_addr)) {
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warnmsg(LOG_INFO, __func__,
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"invalid RA with non link-local source from %s on %s",
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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/* xxx: more validation? */
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if ((ifi = find_ifinfo(pi->ipi6_ifindex)) == NULL) {
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warnmsg(LOG_INFO, __func__,
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"received RA from %s on an unexpected IF(%s)",
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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warnmsg(LOG_DEBUG, __func__,
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"received RA from %s on %s, state is %d",
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf, INET6_ADDRSTRLEN),
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ifi->ifname, ifi->state);
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nd_ra = (struct nd_router_advert *)icp;
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/*
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* Process the "O bit."
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* If the value of OtherConfigFlag changes from FALSE to TRUE, the
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* host should invoke the stateful autoconfiguration protocol,
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* requesting information.
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* [RFC 2462 Section 5.5.3]
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*/
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if (((nd_ra->nd_ra_flags_reserved) & ND_RA_FLAG_OTHER) &&
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!ifi->otherconfig) {
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warnmsg(LOG_DEBUG, __func__,
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"OtherConfigFlag on %s is turned on", ifi->ifname);
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ifi->otherconfig = 1;
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CALL_SCRIPT(OTHER, NULL);
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}
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/* Initialize ra_opt per-interface structure. */
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gettimeofday(&now, NULL);
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if (!TAILQ_EMPTY(&ifi->ifi_ra_opt))
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while ((rao = TAILQ_FIRST(&ifi->ifi_ra_opt)) != NULL) {
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if (rao->rao_msg != NULL)
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free(rao->rao_msg);
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TAILQ_REMOVE(&ifi->ifi_ra_opt, rao, rao_next);
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free(rao);
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}
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else
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TAILQ_INIT(&ifi->ifi_ra_opt);
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#define RA_OPT_NEXT_HDR(x) (struct nd_opt_hdr *)((char *)x + \
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(((struct nd_opt_hdr *)x)->nd_opt_len * 8))
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/* Process RA options. */
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warnmsg(LOG_DEBUG, __func__, "Processing RA");
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raoptp = (char *)icp + sizeof(struct nd_router_advert);
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while (raoptp < (char *)icp + msglen) {
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ndo = (struct nd_opt_hdr *)raoptp;
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warnmsg(LOG_DEBUG, __func__, "ndo = %p", raoptp);
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warnmsg(LOG_DEBUG, __func__, "ndo->nd_opt_type = %d",
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ndo->nd_opt_type);
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warnmsg(LOG_DEBUG, __func__, "ndo->nd_opt_len = %d",
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ndo->nd_opt_len);
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switch (ndo->nd_opt_type) {
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case ND_OPT_RDNSS:
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rdnss = (struct nd_opt_rdnss *)raoptp;
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/* Optlen sanity check (Section 5.3.1 in RFC 6106) */
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if (rdnss->nd_opt_rdnss_len < 3) {
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warnmsg(LOG_INFO, __func__,
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"too short RDNSS option"
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"in RA from %s was ignored.",
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inet_ntop(AF_INET6, &from.sin6_addr,
|
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ntopbuf, INET6_ADDRSTRLEN));
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break;
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}
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addr = (struct in6_addr *)(raoptp + sizeof(*rdnss));
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while ((char *)addr < (char *)RA_OPT_NEXT_HDR(raoptp)) {
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if (inet_ntop(AF_INET6, addr, ntopbuf,
|
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INET6_ADDRSTRLEN) == NULL) {
|
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warnmsg(LOG_INFO, __func__,
|
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"an invalid address in RDNSS option"
|
|
" in RA from %s was ignored.",
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inet_ntop(AF_INET6, &from.sin6_addr,
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ntopbuf, INET6_ADDRSTRLEN));
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addr++;
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continue;
|
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}
|
|
if (IN6_IS_ADDR_LINKLOCAL(addr))
|
|
/* XXX: % has to be escaped here */
|
|
l = snprintf(nsbuf, sizeof(nsbuf),
|
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"%s%c%s", ntopbuf,
|
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SCOPE_DELIMITER,
|
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ifi->ifname);
|
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else
|
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l = snprintf(nsbuf, sizeof(nsbuf),
|
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"%s", ntopbuf);
|
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if (l < 0 || (size_t)l >= sizeof(nsbuf)) {
|
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warnmsg(LOG_ERR, __func__,
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"address copying error in "
|
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"RDNSS option: %d.", l);
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addr++;
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continue;
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}
|
|
warnmsg(LOG_DEBUG, __func__, "nsbuf = %s",
|
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nsbuf);
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|
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ELM_MALLOC(rao, break);
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rao->rao_type = ndo->nd_opt_type;
|
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rao->rao_len = strlen(nsbuf);
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rao->rao_msg = strdup(nsbuf);
|
|
if (rao->rao_msg == NULL) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"strdup failed: %s",
|
|
strerror(errno));
|
|
free(rao);
|
|
addr++;
|
|
continue;
|
|
}
|
|
/* Set expiration timer */
|
|
memset(&rao->rao_expire, 0, sizeof(rao->rao_expire));
|
|
memset(&lifetime, 0, sizeof(lifetime));
|
|
lifetime.tv_sec = ntohl(rdnss->nd_opt_rdnss_lifetime);
|
|
timeradd(&now, &lifetime, &rao->rao_expire);
|
|
|
|
TAILQ_INSERT_TAIL(&ifi->ifi_ra_opt, rao, rao_next);
|
|
addr++;
|
|
}
|
|
break;
|
|
case ND_OPT_DNSSL:
|
|
dnssl = (struct nd_opt_dnssl *)raoptp;
|
|
|
|
/* Optlen sanity check (Section 5.3.1 in RFC 6106) */
|
|
if (dnssl->nd_opt_dnssl_len < 2) {
|
|
warnmsg(LOG_INFO, __func__,
|
|
"too short DNSSL option"
|
|
"in RA from %s was ignored.",
|
|
inet_ntop(AF_INET6, &from.sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN));
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Ensure NUL-termination in DNSSL in case of
|
|
* malformed field.
|
|
*/
|
|
p = (char *)RA_OPT_NEXT_HDR(raoptp);
|
|
*(p - 1) = '\0';
|
|
|
|
p = raoptp + sizeof(*dnssl);
|
|
while (1 < (len = dname_labeldec(dname, sizeof(dname),
|
|
p))) {
|
|
/* length == 1 means empty string */
|
|
warnmsg(LOG_DEBUG, __func__, "dname = %s",
|
|
dname);
|
|
|
|
ELM_MALLOC(rao, break);
|
|
rao->rao_type = ndo->nd_opt_type;
|
|
rao->rao_len = strlen(dname);
|
|
rao->rao_msg = strdup(dname);
|
|
if (rao->rao_msg == NULL) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"strdup failed: %s",
|
|
strerror(errno));
|
|
free(rao);
|
|
break;
|
|
}
|
|
/* Set expiration timer */
|
|
memset(&rao->rao_expire, 0, sizeof(rao->rao_expire));
|
|
memset(&lifetime, 0, sizeof(lifetime));
|
|
lifetime.tv_sec = ntohl(dnssl->nd_opt_dnssl_lifetime);
|
|
timeradd(&now, &lifetime, &rao->rao_expire);
|
|
|
|
TAILQ_INSERT_TAIL(&ifi->ifi_ra_opt, rao, rao_next);
|
|
p += len;
|
|
}
|
|
break;
|
|
default:
|
|
/* nothing to do for other options */
|
|
break;
|
|
}
|
|
raoptp = (char *)RA_OPT_NEXT_HDR(raoptp);
|
|
}
|
|
ra_opt_handler(ifi);
|
|
ifi->racnt++;
|
|
|
|
switch (ifi->state) {
|
|
case IFS_IDLE: /* should be ignored */
|
|
case IFS_DELAY: /* right? */
|
|
break;
|
|
case IFS_PROBE:
|
|
ifi->state = IFS_IDLE;
|
|
ifi->probes = 0;
|
|
rtsol_timer_update(ifi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static char resstr_ns_prefix[] = "nameserver ";
|
|
static char resstr_sh_prefix[] = "search ";
|
|
static char resstr_nl[] = "\n";
|
|
static char resstr_sp[] = " ";
|
|
|
|
int
|
|
ra_opt_handler(struct ifinfo *ifi)
|
|
{
|
|
struct ra_opt *rao;
|
|
struct script_msg *smp1, *smp2, *smp3;
|
|
struct timeval now;
|
|
TAILQ_HEAD(, script_msg) sm_rdnss_head =
|
|
TAILQ_HEAD_INITIALIZER(sm_rdnss_head);
|
|
TAILQ_HEAD(, script_msg) sm_dnssl_head =
|
|
TAILQ_HEAD_INITIALIZER(sm_dnssl_head);
|
|
int dcount, dlen;
|
|
|
|
dcount = 0;
|
|
dlen = strlen(resstr_sh_prefix) + strlen(resstr_nl);
|
|
gettimeofday(&now, NULL);
|
|
TAILQ_FOREACH(rao, &ifi->ifi_ra_opt, rao_next) {
|
|
switch (rao->rao_type) {
|
|
case ND_OPT_RDNSS:
|
|
if (timercmp(&now, &rao->rao_expire, >)) {
|
|
warnmsg(LOG_INFO, __func__,
|
|
"expired rdnss entry: %s",
|
|
(char *)rao->rao_msg);
|
|
break;
|
|
}
|
|
ELM_MALLOC(smp1, continue);
|
|
ELM_MALLOC(smp2, goto free1);
|
|
ELM_MALLOC(smp3, goto free2);
|
|
smp1->sm_msg = resstr_ns_prefix;
|
|
TAILQ_INSERT_TAIL(&sm_rdnss_head, smp1, sm_next);
|
|
smp2->sm_msg = rao->rao_msg;
|
|
TAILQ_INSERT_TAIL(&sm_rdnss_head, smp2, sm_next);
|
|
smp3->sm_msg = resstr_nl;
|
|
TAILQ_INSERT_TAIL(&sm_rdnss_head, smp3, sm_next);
|
|
|
|
break;
|
|
case ND_OPT_DNSSL:
|
|
if (timercmp(&now, &rao->rao_expire, >)) {
|
|
warnmsg(LOG_INFO, __func__,
|
|
"expired dnssl entry: %s",
|
|
(char *)rao->rao_msg);
|
|
break;
|
|
}
|
|
dcount++;
|
|
/* Check resolv.conf(5) restrictions. */
|
|
if (dcount > 6) {
|
|
warnmsg(LOG_INFO, __func__,
|
|
"dnssl entry exceeding maximum count (%d>6)"
|
|
": %s", dcount, (char *)rao->rao_msg);
|
|
break;
|
|
}
|
|
if (256 < dlen + strlen(rao->rao_msg) +
|
|
strlen(resstr_sp)) {
|
|
warnmsg(LOG_INFO, __func__,
|
|
"dnssl entry exceeding maximum length "
|
|
"(>256): %s", (char *)rao->rao_msg);
|
|
break;
|
|
}
|
|
ELM_MALLOC(smp1, continue);
|
|
ELM_MALLOC(smp2, goto free1);
|
|
if (TAILQ_EMPTY(&sm_dnssl_head)) {
|
|
ELM_MALLOC(smp3, goto free2);
|
|
smp3->sm_msg = resstr_sh_prefix;
|
|
TAILQ_INSERT_TAIL(&sm_dnssl_head, smp3,
|
|
sm_next);
|
|
}
|
|
smp1->sm_msg = rao->rao_msg;
|
|
TAILQ_INSERT_TAIL(&sm_dnssl_head, smp1, sm_next);
|
|
smp2->sm_msg = resstr_sp;
|
|
TAILQ_INSERT_TAIL(&sm_dnssl_head, smp2, sm_next);
|
|
dlen += strlen(rao->rao_msg) + strlen(resstr_sp);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
continue;
|
|
free2:
|
|
free(smp2);
|
|
free1:
|
|
free(smp1);
|
|
}
|
|
/* Add \n for DNSSL list. */
|
|
if (!TAILQ_EMPTY(&sm_dnssl_head)) {
|
|
ELM_MALLOC(smp1, goto ra_opt_handler_freeit);
|
|
smp1->sm_msg = resstr_nl;
|
|
TAILQ_INSERT_TAIL(&sm_dnssl_head, smp1, sm_next);
|
|
}
|
|
TAILQ_CONCAT(&sm_rdnss_head, &sm_dnssl_head, sm_next);
|
|
|
|
if (!TAILQ_EMPTY(&sm_rdnss_head))
|
|
CALL_SCRIPT(RESADD, &sm_rdnss_head);
|
|
else
|
|
CALL_SCRIPT(RESDEL, NULL);
|
|
|
|
ra_opt_handler_freeit:
|
|
/* Clear script message queue. */
|
|
if (!TAILQ_EMPTY(&sm_rdnss_head)) {
|
|
while ((smp1 = TAILQ_FIRST(&sm_rdnss_head)) != NULL) {
|
|
TAILQ_REMOVE(&sm_rdnss_head, smp1, sm_next);
|
|
free(smp1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
call_script(const int argc, const char *const argv[], void *head)
|
|
{
|
|
const char *scriptpath;
|
|
int fd[2];
|
|
int error;
|
|
pid_t pid, wpid;
|
|
TAILQ_HEAD(, script_msg) *sm_head;
|
|
|
|
if ((scriptpath = argv[0]) == NULL)
|
|
return;
|
|
|
|
fd[0] = fd[1] = -1;
|
|
sm_head = head;
|
|
if (sm_head != NULL && !TAILQ_EMPTY(sm_head)) {
|
|
error = pipe(fd);
|
|
if (error) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"failed to create a pipe: %s", strerror(errno));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* launch the script */
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"failed to fork: %s", strerror(errno));
|
|
return;
|
|
} else if (pid) { /* parent */
|
|
int wstatus;
|
|
|
|
if (fd[0] != -1) { /* Send message to the child if any. */
|
|
ssize_t len;
|
|
struct script_msg *smp;
|
|
|
|
close(fd[0]);
|
|
TAILQ_FOREACH(smp, sm_head, sm_next) {
|
|
len = strlen(smp->sm_msg);
|
|
warnmsg(LOG_DEBUG, __func__,
|
|
"write to child = %s(%zd)",
|
|
smp->sm_msg, len);
|
|
if (write(fd[1], smp->sm_msg, len) != len) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"write to child failed: %s",
|
|
strerror(errno));
|
|
break;
|
|
}
|
|
}
|
|
close(fd[1]);
|
|
}
|
|
do {
|
|
wpid = wait(&wstatus);
|
|
} while (wpid != pid && wpid > 0);
|
|
|
|
if (wpid < 0)
|
|
warnmsg(LOG_ERR, __func__,
|
|
"wait: %s", strerror(errno));
|
|
else
|
|
warnmsg(LOG_DEBUG, __func__,
|
|
"script \"%s\" terminated", scriptpath);
|
|
} else { /* child */
|
|
int nullfd;
|
|
char **_argv;
|
|
|
|
if (safefile(scriptpath)) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"script \"%s\" cannot be executed safely",
|
|
scriptpath);
|
|
exit(1);
|
|
}
|
|
nullfd = open("/dev/null", O_RDWR);
|
|
if (nullfd < 0) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"open /dev/null: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (fd[0] != -1) { /* Receive message from STDIN if any. */
|
|
close(fd[1]);
|
|
if (fd[0] != STDIN_FILENO) {
|
|
/* Connect a pipe read-end to child's STDIN. */
|
|
if (dup2(fd[0], STDIN_FILENO) != STDIN_FILENO) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"dup2 STDIN: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
close(fd[0]);
|
|
}
|
|
} else
|
|
dup2(nullfd, STDIN_FILENO);
|
|
|
|
dup2(nullfd, STDOUT_FILENO);
|
|
dup2(nullfd, STDERR_FILENO);
|
|
if (nullfd > STDERR_FILENO)
|
|
close(nullfd);
|
|
|
|
_argv = malloc(sizeof(*_argv) * argc);
|
|
if (_argv == NULL) {
|
|
warnmsg(LOG_ERR, __func__,
|
|
"malloc: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memcpy(_argv, argv, (size_t)argc);
|
|
execv(scriptpath, (char *const *)_argv);
|
|
warnmsg(LOG_ERR, __func__, "child: exec failed: %s",
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static int
|
|
safefile(const char *path)
|
|
{
|
|
struct stat s;
|
|
uid_t myuid;
|
|
|
|
/* no setuid */
|
|
if (getuid() != geteuid()) {
|
|
warnmsg(LOG_NOTICE, __func__,
|
|
"setuid'ed execution not allowed\n");
|
|
return (-1);
|
|
}
|
|
|
|
if (lstat(path, &s) != 0) {
|
|
warnmsg(LOG_NOTICE, __func__, "lstat failed: %s",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
/* the file must be owned by the running uid */
|
|
myuid = getuid();
|
|
if (s.st_uid != myuid) {
|
|
warnmsg(LOG_NOTICE, __func__,
|
|
"%s has invalid owner uid\n", path);
|
|
return (-1);
|
|
}
|
|
|
|
switch (s.st_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
break;
|
|
default:
|
|
warnmsg(LOG_NOTICE, __func__,
|
|
"%s is an invalid file type 0x%o\n",
|
|
path, (s.st_mode & S_IFMT));
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Decode domain name label encoding in RFC 1035 Section 3.1 */
|
|
static size_t
|
|
dname_labeldec(char *dst, size_t dlen, const char *src)
|
|
{
|
|
size_t len;
|
|
const char *src_origin;
|
|
const char *src_last;
|
|
const char *dst_origin;
|
|
|
|
src_origin = src;
|
|
src_last = strchr(src, '\0');
|
|
dst_origin = dst;
|
|
memset(dst, '\0', dlen);
|
|
while (src && (len = (uint8_t)(*src++) & 0x3f) &&
|
|
(src + len) <= src_last) {
|
|
if (dst != dst_origin)
|
|
*dst++ = '.';
|
|
warnmsg(LOG_DEBUG, __func__, "labellen = %zd", len);
|
|
memcpy(dst, src, len);
|
|
src += len;
|
|
dst += len;
|
|
}
|
|
*dst = '\0';
|
|
|
|
/*
|
|
* XXX validate that domain name only contains valid characters
|
|
* for two reasons: 1) correctness, 2) we do not want to pass
|
|
* possible malicious, unescaped characters like `` to a script
|
|
* or program that could be exploited that way.
|
|
*/
|
|
|
|
return (src - src_origin);
|
|
}
|