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![Mark Johnston](/assets/img/avatar_default.png)
A new usage is added so that parameters for netdump may be specified. Specifically, one configures an interface for netdump with: # dumpon -c <client IP> -s <server IP> [-g <gateway IP>] <iface name> Reviewed by: bdrewery, cem (earlier versions), sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15254
495 lines
12 KiB
C
495 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/disk.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <paths.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/netdump/netdump.h>
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#ifdef HAVE_CRYPTO
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#endif
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static int verbose;
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static void _Noreturn
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usage(void)
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{
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fprintf(stderr,
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"usage: dumpon [-v] [-k <pubkey>] [-Zz] <device>\n"
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" dumpon [-v] [-k <pubkey>] [-Zz]\n"
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" [-g <gateway>|default] -s <server> -c <client> <iface>\n"
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" dumpon [-v] off\n"
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" dumpon [-v] -l\n");
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exit(EX_USAGE);
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}
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/*
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* Look for a default route on the specified interface.
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*/
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static char *
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find_gateway(const char *ifname)
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{
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struct ifaddrs *ifa, *ifap;
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struct rt_msghdr *rtm;
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struct sockaddr *sa;
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struct sockaddr_dl *sdl;
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struct sockaddr_in *dst, *mask, *gw;
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char *buf, *next, *ret;
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size_t sz;
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int error, i, ifindex, mib[7];
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ret = NULL;
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/* First look up the interface index. */
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if (getifaddrs(&ifap) != 0)
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err(EX_OSERR, "getifaddrs");
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for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
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if (ifa->ifa_addr->sa_family != AF_LINK)
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continue;
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if (strcmp(ifa->ifa_name, ifname) == 0) {
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sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
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ifindex = sdl->sdl_index;
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break;
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}
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}
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if (ifa == NULL)
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errx(1, "couldn't find interface index for '%s'", ifname);
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freeifaddrs(ifap);
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/* Now get the IPv4 routing table. */
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET;
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mib[4] = NET_RT_DUMP;
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mib[5] = 0;
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mib[6] = -1; /* FIB */
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for (;;) {
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if (sysctl(mib, nitems(mib), NULL, &sz, NULL, 0) != 0)
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err(EX_OSERR, "sysctl(NET_RT_DUMP)");
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buf = malloc(sz);
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error = sysctl(mib, nitems(mib), buf, &sz, NULL, 0);
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if (error == 0)
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break;
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if (errno != ENOMEM)
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err(EX_OSERR, "sysctl(NET_RT_DUMP)");
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free(buf);
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}
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for (next = buf; next < buf + sz; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)(void *)next;
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if (rtm->rtm_version != RTM_VERSION)
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continue;
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if ((rtm->rtm_flags & RTF_GATEWAY) == 0 ||
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rtm->rtm_index != ifindex)
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continue;
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dst = gw = mask = NULL;
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sa = (struct sockaddr *)(rtm + 1);
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for (i = 0; i < RTAX_MAX; i++) {
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if ((rtm->rtm_addrs & (1 << i)) != 0) {
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switch (i) {
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case RTAX_DST:
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dst = (void *)sa;
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break;
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case RTAX_GATEWAY:
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gw = (void *)sa;
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break;
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case RTAX_NETMASK:
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mask = (void *)sa;
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break;
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}
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}
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sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa));
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}
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if (dst->sin_addr.s_addr == INADDR_ANY &&
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mask->sin_addr.s_addr == 0) {
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ret = inet_ntoa(gw->sin_addr);
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break;
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}
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}
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free(buf);
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return (ret);
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}
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static void
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check_size(int fd, const char *fn)
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{
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int name[] = { CTL_HW, HW_PHYSMEM };
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size_t namelen = nitems(name);
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unsigned long physmem;
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size_t len;
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off_t mediasize;
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int minidump;
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len = sizeof(minidump);
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if (sysctlbyname("debug.minidump", &minidump, &len, NULL, 0) == 0 &&
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minidump == 1)
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return;
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len = sizeof(physmem);
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if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0)
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err(EX_OSERR, "can't get memory size");
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if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0)
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err(EX_OSERR, "%s: can't get size", fn);
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if ((uintmax_t)mediasize < (uintmax_t)physmem) {
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if (verbose)
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printf("%s is smaller than physical memory\n", fn);
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exit(EX_IOERR);
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}
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}
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#ifdef HAVE_CRYPTO
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static void
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genkey(const char *pubkeyfile, struct diocskerneldump_arg *kdap)
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{
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FILE *fp;
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RSA *pubkey;
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assert(pubkeyfile != NULL);
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assert(kdap != NULL);
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fp = NULL;
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pubkey = NULL;
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fp = fopen(pubkeyfile, "r");
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if (fp == NULL)
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err(1, "Unable to open %s", pubkeyfile);
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if (cap_enter() < 0 && errno != ENOSYS)
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err(1, "Unable to enter capability mode");
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pubkey = RSA_new();
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if (pubkey == NULL) {
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errx(1, "Unable to allocate an RSA structure: %s",
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ERR_error_string(ERR_get_error(), NULL));
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}
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pubkey = PEM_read_RSA_PUBKEY(fp, &pubkey, NULL, NULL);
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fclose(fp);
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fp = NULL;
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if (pubkey == NULL)
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errx(1, "Unable to read data from %s.", pubkeyfile);
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kdap->kda_encryptedkeysize = RSA_size(pubkey);
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if (kdap->kda_encryptedkeysize > KERNELDUMP_ENCKEY_MAX_SIZE) {
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errx(1, "Public key has to be at most %db long.",
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8 * KERNELDUMP_ENCKEY_MAX_SIZE);
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}
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kdap->kda_encryptedkey = calloc(1, kdap->kda_encryptedkeysize);
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if (kdap->kda_encryptedkey == NULL)
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err(1, "Unable to allocate encrypted key");
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kdap->kda_encryption = KERNELDUMP_ENC_AES_256_CBC;
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arc4random_buf(kdap->kda_key, sizeof(kdap->kda_key));
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if (RSA_public_encrypt(sizeof(kdap->kda_key), kdap->kda_key,
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kdap->kda_encryptedkey, pubkey,
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RSA_PKCS1_PADDING) != (int)kdap->kda_encryptedkeysize) {
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errx(1, "Unable to encrypt the one-time key.");
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}
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RSA_free(pubkey);
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}
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#endif
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static void
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listdumpdev(void)
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{
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char dumpdev[PATH_MAX];
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struct netdump_conf ndconf;
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size_t len;
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const char *sysctlname = "kern.shutdown.dumpdevname";
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int fd;
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len = sizeof(dumpdev);
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if (sysctlbyname(sysctlname, &dumpdev, &len, NULL, 0) != 0) {
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if (errno == ENOMEM) {
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err(EX_OSERR, "Kernel returned too large of a buffer for '%s'\n",
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sysctlname);
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} else {
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err(EX_OSERR, "Sysctl get '%s'\n", sysctlname);
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}
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}
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if (strlen(dumpdev) == 0)
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(void)strlcpy(dumpdev, _PATH_DEVNULL, sizeof(dumpdev));
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if (verbose)
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printf("kernel dumps on ");
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printf("%s\n", dumpdev);
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/* If netdump is enabled, print the configuration parameters. */
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if (verbose) {
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fd = open(_PATH_NETDUMP, O_RDONLY);
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if (fd < 0) {
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if (errno != ENOENT)
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err(EX_OSERR, "opening %s", _PATH_NETDUMP);
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return;
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}
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if (ioctl(fd, NETDUMPGCONF, &ndconf) != 0) {
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if (errno != ENXIO)
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err(EX_OSERR, "ioctl(NETDUMPGCONF)");
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(void)close(fd);
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return;
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}
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printf("server address: %s\n", inet_ntoa(ndconf.ndc_server));
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printf("client address: %s\n", inet_ntoa(ndconf.ndc_client));
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printf("gateway address: %s\n", inet_ntoa(ndconf.ndc_gateway));
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(void)close(fd);
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}
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}
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static int
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opendumpdev(const char *arg, char *dumpdev)
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{
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int fd, i;
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if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
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strlcpy(dumpdev, arg, PATH_MAX);
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else {
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i = snprintf(dumpdev, PATH_MAX, "%s%s", _PATH_DEV, arg);
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if (i < 0)
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err(EX_OSERR, "%s", arg);
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if (i >= PATH_MAX)
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errc(EX_DATAERR, EINVAL, "%s", arg);
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}
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fd = open(dumpdev, O_RDONLY);
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if (fd < 0)
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err(EX_OSFILE, "%s", dumpdev);
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return (fd);
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}
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int
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main(int argc, char *argv[])
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{
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char dumpdev[PATH_MAX];
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struct diocskerneldump_arg _kda, *kdap;
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struct netdump_conf ndconf;
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struct addrinfo hints, *res;
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const char *dev, *pubkeyfile, *server, *client, *gateway;
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int ch, error, fd;
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bool enable, gzip, list, netdump, zstd;
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gzip = list = netdump = zstd = false;
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kdap = NULL;
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pubkeyfile = NULL;
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server = client = gateway = NULL;
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while ((ch = getopt(argc, argv, "c:g:k:ls:vZz")) != -1)
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switch ((char)ch) {
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case 'c':
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client = optarg;
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break;
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case 'g':
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gateway = optarg;
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break;
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case 'k':
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pubkeyfile = optarg;
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break;
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case 'l':
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list = true;
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break;
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case 's':
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server = optarg;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'Z':
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zstd = true;
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break;
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case 'z':
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gzip = true;
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break;
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default:
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usage();
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}
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if (gzip && zstd)
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errx(EX_USAGE, "The -z and -Z options are mutually exclusive.");
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argc -= optind;
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argv += optind;
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if (list) {
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listdumpdev();
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exit(EX_OK);
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}
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if (argc != 1)
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usage();
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#ifndef HAVE_CRYPTO
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if (pubkeyfile != NULL)
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errx("Unable to use the public key. Recompile dumpon with OpenSSL support.");
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#endif
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if (server != NULL && client != NULL) {
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enable = true;
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dev = _PATH_NETDUMP;
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netdump = true;
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kdap = &ndconf.ndc_kda;
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} else if (server == NULL && client == NULL && argc > 0) {
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enable = strcmp(argv[0], "off") != 0;
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dev = enable ? argv[0] : _PATH_DEVNULL;
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netdump = false;
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kdap = &_kda;
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} else
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usage();
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fd = opendumpdev(dev, dumpdev);
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if (!netdump && !gzip)
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check_size(fd, dumpdev);
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bzero(kdap, sizeof(*kdap));
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kdap->kda_enable = 0;
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if (ioctl(fd, DIOCSKERNELDUMP, kdap) != 0)
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err(EX_OSERR, "ioctl(DIOCSKERNELDUMP)");
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if (!enable)
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exit(EX_OK);
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explicit_bzero(kdap, sizeof(*kdap));
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kdap->kda_enable = 1;
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kdap->kda_compression = KERNELDUMP_COMP_NONE;
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if (zstd)
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kdap->kda_compression = KERNELDUMP_COMP_ZSTD;
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else if (gzip)
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kdap->kda_compression = KERNELDUMP_COMP_GZIP;
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if (netdump) {
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_INET;
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hints.ai_protocol = IPPROTO_UDP;
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res = NULL;
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error = getaddrinfo(server, NULL, &hints, &res);
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if (error != 0)
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err(1, "%s", gai_strerror(error));
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if (res == NULL)
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errx(1, "failed to resolve '%s'", server);
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server = inet_ntoa(
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((struct sockaddr_in *)(void *)res->ai_addr)->sin_addr);
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freeaddrinfo(res);
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if (strlcpy(ndconf.ndc_iface, argv[0],
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sizeof(ndconf.ndc_iface)) >= sizeof(ndconf.ndc_iface))
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errx(EX_USAGE, "invalid interface name '%s'", argv[0]);
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if (inet_aton(server, &ndconf.ndc_server) == 0)
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errx(EX_USAGE, "invalid server address '%s'", server);
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if (inet_aton(client, &ndconf.ndc_client) == 0)
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errx(EX_USAGE, "invalid client address '%s'", client);
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if (gateway == NULL)
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gateway = server;
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else if (strcmp(gateway, "default") == 0 &&
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(gateway = find_gateway(argv[0])) == NULL)
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errx(EX_NOHOST,
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"failed to look up next-hop router for %s", server);
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if (inet_aton(gateway, &ndconf.ndc_gateway) == 0)
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errx(EX_USAGE, "invalid gateway address '%s'", gateway);
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#ifdef HAVE_CRYPTO
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if (pubkeyfile != NULL)
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genkey(pubkeyfile, kdap);
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#endif
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error = ioctl(fd, NETDUMPSCONF, &ndconf);
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if (error != 0)
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error = errno;
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explicit_bzero(kdap->kda_encryptedkey,
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kdap->kda_encryptedkeysize);
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free(kdap->kda_encryptedkey);
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explicit_bzero(kdap, sizeof(*kdap));
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if (error != 0)
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errc(EX_OSERR, error, "ioctl(NETDUMPSCONF)");
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} else {
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#ifdef HAVE_CRYPTO
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if (pubkeyfile != NULL)
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genkey(pubkeyfile, kdap);
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#endif
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error = ioctl(fd, DIOCSKERNELDUMP, kdap);
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if (error != 0)
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error = errno;
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explicit_bzero(kdap->kda_encryptedkey,
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kdap->kda_encryptedkeysize);
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free(kdap->kda_encryptedkey);
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explicit_bzero(kdap, sizeof(*kdap));
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if (error != 0)
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errc(EX_OSERR, error, "ioctl(DIOCSKERNELDUMP)");
|
|
}
|
|
if (verbose)
|
|
printf("kernel dumps on %s\n", dumpdev);
|
|
|
|
exit(EX_OK);
|
|
}
|