1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1980, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/param.h> 47 #include <sys/capsicum.h> 48 #include <sys/disk.h> 49 #include <sys/socket.h> 50 #include <sys/sysctl.h> 51 #include <sys/wait.h> 52 53 #include <assert.h> 54 #include <capsicum_helpers.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <ifaddrs.h> 59 #include <netdb.h> 60 #include <paths.h> 61 #include <stdbool.h> 62 #include <stdint.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <sysexits.h> 67 #include <unistd.h> 68 69 #include <arpa/inet.h> 70 71 #include <net/if.h> 72 #include <net/if_dl.h> 73 #include <net/route.h> 74 75 #include <netinet/in.h> 76 #include <netinet/netdump/netdump.h> 77 78 #ifdef HAVE_CRYPTO 79 #include <openssl/err.h> 80 #include <openssl/pem.h> 81 #include <openssl/rand.h> 82 #include <openssl/rsa.h> 83 #endif 84 85 static int verbose; 86 87 static void _Noreturn 88 usage(void) 89 { 90 fprintf(stderr, 91 "usage: dumpon [-i index] [-r] [-v] [-k <pubkey>] [-Zz] <device>\n" 92 " dumpon [-i index] [-r] [-v] [-k <pubkey>] [-Zz]\n" 93 " [-g <gateway>] -s <server> -c <client> <iface>\n" 94 " dumpon [-v] off\n" 95 " dumpon [-v] -l\n"); 96 exit(EX_USAGE); 97 } 98 99 /* 100 * Look for a default route on the specified interface. 101 */ 102 static char * 103 find_gateway(const char *ifname) 104 { 105 struct ifaddrs *ifa, *ifap; 106 struct rt_msghdr *rtm; 107 struct sockaddr *sa; 108 struct sockaddr_dl *sdl; 109 struct sockaddr_in *dst, *mask, *gw; 110 char *buf, *next, *ret; 111 size_t sz; 112 int error, i, ifindex, mib[7]; 113 114 /* First look up the interface index. */ 115 if (getifaddrs(&ifap) != 0) 116 err(EX_OSERR, "getifaddrs"); 117 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 118 if (ifa->ifa_addr->sa_family != AF_LINK) 119 continue; 120 if (strcmp(ifa->ifa_name, ifname) == 0) { 121 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr; 122 ifindex = sdl->sdl_index; 123 break; 124 } 125 } 126 if (ifa == NULL) 127 errx(1, "couldn't find interface index for '%s'", ifname); 128 freeifaddrs(ifap); 129 130 /* Now get the IPv4 routing table. */ 131 mib[0] = CTL_NET; 132 mib[1] = PF_ROUTE; 133 mib[2] = 0; 134 mib[3] = AF_INET; 135 mib[4] = NET_RT_DUMP; 136 mib[5] = 0; 137 mib[6] = -1; /* FIB */ 138 139 for (;;) { 140 if (sysctl(mib, nitems(mib), NULL, &sz, NULL, 0) != 0) 141 err(EX_OSERR, "sysctl(NET_RT_DUMP)"); 142 buf = malloc(sz); 143 error = sysctl(mib, nitems(mib), buf, &sz, NULL, 0); 144 if (error == 0) 145 break; 146 if (errno != ENOMEM) 147 err(EX_OSERR, "sysctl(NET_RT_DUMP)"); 148 free(buf); 149 } 150 151 ret = NULL; 152 for (next = buf; next < buf + sz; next += rtm->rtm_msglen) { 153 rtm = (struct rt_msghdr *)(void *)next; 154 if (rtm->rtm_version != RTM_VERSION) 155 continue; 156 if ((rtm->rtm_flags & RTF_GATEWAY) == 0 || 157 rtm->rtm_index != ifindex) 158 continue; 159 160 dst = gw = mask = NULL; 161 sa = (struct sockaddr *)(rtm + 1); 162 for (i = 0; i < RTAX_MAX; i++) { 163 if ((rtm->rtm_addrs & (1 << i)) != 0) { 164 switch (i) { 165 case RTAX_DST: 166 dst = (void *)sa; 167 break; 168 case RTAX_GATEWAY: 169 gw = (void *)sa; 170 break; 171 case RTAX_NETMASK: 172 mask = (void *)sa; 173 break; 174 } 175 } 176 sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa)); 177 } 178 179 if (dst->sin_addr.s_addr == INADDR_ANY && 180 mask->sin_addr.s_addr == 0) { 181 ret = inet_ntoa(gw->sin_addr); 182 break; 183 } 184 } 185 free(buf); 186 return (ret); 187 } 188 189 static void 190 check_link_status(const char *ifname) 191 { 192 struct ifaddrs *ifap, *ifa; 193 194 if (getifaddrs(&ifap) != 0) 195 err(EX_OSERR, "getifaddrs"); 196 197 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 198 if (strcmp(ifname, ifa->ifa_name) != 0) 199 continue; 200 if ((ifa->ifa_flags & IFF_UP) == 0) { 201 warnx("warning: %s's link is down", ifname); 202 } 203 break; 204 } 205 freeifaddrs(ifap); 206 } 207 208 static void 209 check_size(int fd, const char *fn) 210 { 211 int name[] = { CTL_HW, HW_PHYSMEM }; 212 size_t namelen = nitems(name); 213 unsigned long physmem; 214 size_t len; 215 off_t mediasize; 216 int minidump; 217 218 len = sizeof(minidump); 219 if (sysctlbyname("debug.minidump", &minidump, &len, NULL, 0) == 0 && 220 minidump == 1) 221 return; 222 len = sizeof(physmem); 223 if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0) 224 err(EX_OSERR, "can't get memory size"); 225 if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0) 226 err(EX_OSERR, "%s: can't get size", fn); 227 if ((uintmax_t)mediasize < (uintmax_t)physmem) 228 errx(EX_IOERR, "%s is smaller than physical memory", fn); 229 } 230 231 #ifdef HAVE_CRYPTO 232 static void 233 _genkey(const char *pubkeyfile, struct diocskerneldump_arg *kdap) 234 { 235 FILE *fp; 236 RSA *pubkey; 237 238 assert(pubkeyfile != NULL); 239 assert(kdap != NULL); 240 241 fp = NULL; 242 pubkey = NULL; 243 244 fp = fopen(pubkeyfile, "r"); 245 if (fp == NULL) 246 err(1, "Unable to open %s", pubkeyfile); 247 248 /* 249 * Obsolescent OpenSSL only knows about /dev/random, and needs to 250 * pre-seed before entering cap mode. For whatever reason, 251 * RSA_pub_encrypt uses the internal PRNG. 252 */ 253 #if OPENSSL_VERSION_NUMBER < 0x10100000L 254 { 255 unsigned char c[1]; 256 RAND_bytes(c, 1); 257 } 258 #endif 259 260 if (caph_enter() < 0) 261 err(1, "Unable to enter capability mode"); 262 263 pubkey = RSA_new(); 264 if (pubkey == NULL) { 265 errx(1, "Unable to allocate an RSA structure: %s", 266 ERR_error_string(ERR_get_error(), NULL)); 267 } 268 269 pubkey = PEM_read_RSA_PUBKEY(fp, &pubkey, NULL, NULL); 270 fclose(fp); 271 fp = NULL; 272 if (pubkey == NULL) 273 errx(1, "Unable to read data from %s.", pubkeyfile); 274 275 /* 276 * RSA keys under ~1024 bits are trivially factorable (2018). OpenSSL 277 * provides an API for RSA keys to estimate the symmetric-cipher 278 * "equivalent" bits of security (defined in NIST SP800-57), which as 279 * of this writing equates a 2048-bit RSA key to 112 symmetric cipher 280 * bits. 281 * 282 * Use this API as a seatbelt to avoid suggesting to users that their 283 * privacy is protected by encryption when the key size is insufficient 284 * to prevent compromise via factoring. 285 * 286 * Future work: Sanity check for weak 'e', and sanity check for absence 287 * of 'd' (i.e., the supplied key is a public key rather than a full 288 * keypair). 289 */ 290 #if OPENSSL_VERSION_NUMBER >= 0x10100000L 291 if (RSA_security_bits(pubkey) < 112) 292 #else 293 if (RSA_size(pubkey) * 8 < 2048) 294 #endif 295 errx(1, "Small RSA keys (you provided: %db) can be " 296 "factored cheaply. Please generate a larger key.", 297 RSA_size(pubkey) * 8); 298 299 kdap->kda_encryptedkeysize = RSA_size(pubkey); 300 if (kdap->kda_encryptedkeysize > KERNELDUMP_ENCKEY_MAX_SIZE) { 301 errx(1, "Public key has to be at most %db long.", 302 8 * KERNELDUMP_ENCKEY_MAX_SIZE); 303 } 304 305 kdap->kda_encryptedkey = calloc(1, kdap->kda_encryptedkeysize); 306 if (kdap->kda_encryptedkey == NULL) 307 err(1, "Unable to allocate encrypted key"); 308 309 /* 310 * If no cipher was specified, choose a reasonable default. 311 */ 312 if (kdap->kda_encryption == KERNELDUMP_ENC_NONE) 313 kdap->kda_encryption = KERNELDUMP_ENC_CHACHA20; 314 else if (kdap->kda_encryption == KERNELDUMP_ENC_AES_256_CBC && 315 kdap->kda_compression != KERNELDUMP_COMP_NONE) 316 errx(EX_USAGE, "Unpadded AES256-CBC mode cannot be used " 317 "with compression."); 318 319 arc4random_buf(kdap->kda_key, sizeof(kdap->kda_key)); 320 if (RSA_public_encrypt(sizeof(kdap->kda_key), kdap->kda_key, 321 kdap->kda_encryptedkey, pubkey, 322 RSA_PKCS1_OAEP_PADDING) != (int)kdap->kda_encryptedkeysize) { 323 errx(1, "Unable to encrypt the one-time key: %s", 324 ERR_error_string(ERR_get_error(), NULL)); 325 } 326 RSA_free(pubkey); 327 } 328 329 /* 330 * Run genkey() in a child so it can use capability mode without affecting 331 * the rest of the runtime. 332 */ 333 static void 334 genkey(const char *pubkeyfile, struct diocskerneldump_arg *kdap) 335 { 336 pid_t pid; 337 int error, filedes[2], status; 338 ssize_t bytes; 339 340 if (pipe2(filedes, O_CLOEXEC) != 0) 341 err(1, "pipe"); 342 pid = fork(); 343 switch (pid) { 344 case -1: 345 err(1, "fork"); 346 break; 347 case 0: 348 close(filedes[0]); 349 _genkey(pubkeyfile, kdap); 350 /* Write the new kdap back to the parent. */ 351 bytes = write(filedes[1], kdap, sizeof(*kdap)); 352 if (bytes != sizeof(*kdap)) 353 err(1, "genkey pipe write"); 354 bytes = write(filedes[1], kdap->kda_encryptedkey, 355 kdap->kda_encryptedkeysize); 356 if (bytes != (ssize_t)kdap->kda_encryptedkeysize) 357 err(1, "genkey pipe write kda_encryptedkey"); 358 _exit(0); 359 } 360 close(filedes[1]); 361 /* Read in the child's genkey() result into kdap. */ 362 bytes = read(filedes[0], kdap, sizeof(*kdap)); 363 if (bytes != sizeof(*kdap)) 364 errx(1, "genkey pipe read"); 365 if (kdap->kda_encryptedkeysize > KERNELDUMP_ENCKEY_MAX_SIZE) 366 errx(1, "Public key has to be at most %db long.", 367 8 * KERNELDUMP_ENCKEY_MAX_SIZE); 368 kdap->kda_encryptedkey = calloc(1, kdap->kda_encryptedkeysize); 369 if (kdap->kda_encryptedkey == NULL) 370 err(1, "Unable to allocate encrypted key"); 371 bytes = read(filedes[0], kdap->kda_encryptedkey, 372 kdap->kda_encryptedkeysize); 373 if (bytes != (ssize_t)kdap->kda_encryptedkeysize) 374 errx(1, "genkey pipe read kda_encryptedkey"); 375 error = waitpid(pid, &status, WEXITED); 376 if (error == -1) 377 err(1, "waitpid"); 378 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) 379 errx(1, "genkey child exited with status %d", 380 WEXITSTATUS(status)); 381 else if (WIFSIGNALED(status)) 382 errx(1, "genkey child exited with signal %d", 383 WTERMSIG(status)); 384 close(filedes[0]); 385 } 386 #endif 387 388 static void 389 listdumpdev(void) 390 { 391 static char ip[200]; 392 393 char dumpdev[PATH_MAX]; 394 struct diocskerneldump_arg ndconf; 395 size_t len; 396 const char *sysctlname = "kern.shutdown.dumpdevname"; 397 int fd; 398 399 len = sizeof(dumpdev); 400 if (sysctlbyname(sysctlname, &dumpdev, &len, NULL, 0) != 0) { 401 if (errno == ENOMEM) { 402 err(EX_OSERR, "Kernel returned too large of a buffer for '%s'\n", 403 sysctlname); 404 } else { 405 err(EX_OSERR, "Sysctl get '%s'\n", sysctlname); 406 } 407 } 408 if (strlen(dumpdev) == 0) 409 (void)strlcpy(dumpdev, _PATH_DEVNULL, sizeof(dumpdev)); 410 411 if (verbose) { 412 char *ctx, *dd; 413 unsigned idx; 414 415 printf("kernel dumps on priority: device\n"); 416 idx = 0; 417 ctx = dumpdev; 418 while ((dd = strsep(&ctx, ",")) != NULL) 419 printf("%u: %s\n", idx++, dd); 420 } else 421 printf("%s\n", dumpdev); 422 423 /* If netdump is enabled, print the configuration parameters. */ 424 if (verbose) { 425 fd = open(_PATH_NETDUMP, O_RDONLY); 426 if (fd < 0) { 427 if (errno != ENOENT) 428 err(EX_OSERR, "opening %s", _PATH_NETDUMP); 429 return; 430 } 431 if (ioctl(fd, DIOCGKERNELDUMP, &ndconf) != 0) { 432 if (errno != ENXIO) 433 err(EX_OSERR, "ioctl(DIOCGKERNELDUMP)"); 434 (void)close(fd); 435 return; 436 } 437 438 printf("server address: %s\n", 439 inet_ntop(ndconf.kda_af, &ndconf.kda_server, ip, 440 sizeof(ip))); 441 printf("client address: %s\n", 442 inet_ntop(ndconf.kda_af, &ndconf.kda_client, ip, 443 sizeof(ip))); 444 printf("gateway address: %s\n", 445 inet_ntop(ndconf.kda_af, &ndconf.kda_gateway, ip, 446 sizeof(ip))); 447 (void)close(fd); 448 } 449 } 450 451 static int 452 opendumpdev(const char *arg, char *dumpdev) 453 { 454 int fd, i; 455 456 if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) 457 strlcpy(dumpdev, arg, PATH_MAX); 458 else { 459 i = snprintf(dumpdev, PATH_MAX, "%s%s", _PATH_DEV, arg); 460 if (i < 0) 461 err(EX_OSERR, "%s", arg); 462 if (i >= PATH_MAX) 463 errc(EX_DATAERR, EINVAL, "%s", arg); 464 } 465 466 fd = open(dumpdev, O_RDONLY); 467 if (fd < 0) 468 err(EX_OSFILE, "%s", dumpdev); 469 return (fd); 470 } 471 472 int 473 main(int argc, char *argv[]) 474 { 475 char dumpdev[PATH_MAX]; 476 struct diocskerneldump_arg ndconf, *kdap; 477 struct addrinfo hints, *res; 478 const char *dev, *pubkeyfile, *server, *client, *gateway; 479 int ch, error, fd, cipher; 480 bool gzip, list, netdump, zstd, insert, rflag; 481 uint8_t ins_idx; 482 483 gzip = list = netdump = zstd = insert = rflag = false; 484 kdap = NULL; 485 pubkeyfile = NULL; 486 server = client = gateway = NULL; 487 ins_idx = KDA_APPEND; 488 cipher = KERNELDUMP_ENC_NONE; 489 490 while ((ch = getopt(argc, argv, "C:c:g:i:k:lrs:vZz")) != -1) 491 switch ((char)ch) { 492 case 'C': 493 if (strcasecmp(optarg, "chacha") == 0 || 494 strcasecmp(optarg, "chacha20") == 0) 495 cipher = KERNELDUMP_ENC_CHACHA20; 496 else if (strcasecmp(optarg, "aes-cbc") == 0 || 497 strcasecmp(optarg, "aes256-cbc") == 0) 498 cipher = KERNELDUMP_ENC_AES_256_CBC; 499 else 500 errx(EX_USAGE, "Unrecognized cipher algorithm " 501 "'%s'", optarg); 502 break; 503 case 'c': 504 client = optarg; 505 break; 506 case 'g': 507 gateway = optarg; 508 break; 509 case 'i': 510 { 511 int i; 512 513 i = atoi(optarg); 514 if (i < 0 || i >= KDA_APPEND - 1) 515 errx(EX_USAGE, 516 "-i index must be between zero and %d.", 517 (int)KDA_APPEND - 2); 518 insert = true; 519 ins_idx = i; 520 } 521 break; 522 case 'k': 523 pubkeyfile = optarg; 524 break; 525 case 'l': 526 list = true; 527 break; 528 case 'r': 529 rflag = true; 530 break; 531 case 's': 532 server = optarg; 533 break; 534 case 'v': 535 verbose = 1; 536 break; 537 case 'Z': 538 zstd = true; 539 break; 540 case 'z': 541 gzip = true; 542 break; 543 default: 544 usage(); 545 } 546 547 if (gzip && zstd) 548 errx(EX_USAGE, "The -z and -Z options are mutually exclusive."); 549 550 if (insert && rflag) 551 errx(EX_USAGE, "The -i and -r options are mutually exclusive."); 552 553 argc -= optind; 554 argv += optind; 555 556 if (list) { 557 listdumpdev(); 558 exit(EX_OK); 559 } 560 561 if (argc != 1) 562 usage(); 563 564 #ifdef HAVE_CRYPTO 565 if (cipher != KERNELDUMP_ENC_NONE && pubkeyfile == NULL) { 566 errx(EX_USAGE, "-C option requires a public key file."); 567 } else if (pubkeyfile != NULL) { 568 ERR_load_crypto_strings(); 569 } 570 #else 571 if (pubkeyfile != NULL) 572 errx(EX_UNAVAILABLE,"Unable to use the public key." 573 " Recompile dumpon with OpenSSL support."); 574 #endif 575 576 if (server != NULL && client != NULL) { 577 dev = _PATH_NETDUMP; 578 netdump = true; 579 } else if (server == NULL && client == NULL && argc > 0) { 580 if (strcmp(argv[0], "off") == 0) { 581 rflag = true; 582 dev = _PATH_DEVNULL; 583 } else 584 dev = argv[0]; 585 netdump = false; 586 587 if (strcmp(dev, _PATH_DEVNULL) == 0) { 588 /* 589 * Netdump has its own configuration tracking that 590 * is not removed when using /dev/null. 591 */ 592 fd = open(_PATH_NETDUMP, O_RDONLY); 593 if (fd != -1) { 594 bzero(&ndconf, sizeof(ndconf)); 595 ndconf.kda_index = KDA_REMOVE_ALL; 596 ndconf.kda_af = AF_INET; 597 error = ioctl(fd, DIOCSKERNELDUMP, &ndconf); 598 if (error != 0) 599 err(1, "ioctl(%s, DIOCSKERNELDUMP)", 600 _PATH_NETDUMP); 601 close(fd); 602 } 603 } 604 } else 605 usage(); 606 607 fd = opendumpdev(dev, dumpdev); 608 if (!netdump && !gzip && !zstd && !rflag) 609 check_size(fd, dumpdev); 610 611 kdap = &ndconf; 612 bzero(kdap, sizeof(*kdap)); 613 614 if (rflag) 615 kdap->kda_index = KDA_REMOVE; 616 else 617 kdap->kda_index = ins_idx; 618 619 kdap->kda_compression = KERNELDUMP_COMP_NONE; 620 if (zstd) 621 kdap->kda_compression = KERNELDUMP_COMP_ZSTD; 622 else if (gzip) 623 kdap->kda_compression = KERNELDUMP_COMP_GZIP; 624 625 if (netdump) { 626 memset(&hints, 0, sizeof(hints)); 627 hints.ai_family = AF_INET; 628 hints.ai_protocol = IPPROTO_UDP; 629 res = NULL; 630 error = getaddrinfo(server, NULL, &hints, &res); 631 if (error != 0) { 632 if (error == EAI_SYSTEM) 633 err(EX_OSERR, "%s", gai_strerror(error)); 634 errx(EX_NOHOST, "%s", gai_strerror(error)); 635 } 636 server = inet_ntoa( 637 ((struct sockaddr_in *)(void *)res->ai_addr)->sin_addr); 638 freeaddrinfo(res); 639 640 if (strlcpy(ndconf.kda_iface, argv[0], 641 sizeof(ndconf.kda_iface)) >= sizeof(ndconf.kda_iface)) 642 errx(EX_USAGE, "invalid interface name '%s'", argv[0]); 643 if (inet_aton(server, &ndconf.kda_server.in4) == 0) 644 errx(EX_USAGE, "invalid server address '%s'", server); 645 if (inet_aton(client, &ndconf.kda_client.in4) == 0) 646 errx(EX_USAGE, "invalid client address '%s'", client); 647 648 if (gateway == NULL) { 649 gateway = find_gateway(argv[0]); 650 if (gateway == NULL) { 651 if (verbose) 652 printf( 653 "failed to look up gateway for %s\n", 654 server); 655 gateway = server; 656 } 657 } 658 if (inet_aton(gateway, &ndconf.kda_gateway.in4) == 0) 659 errx(EX_USAGE, "invalid gateway address '%s'", gateway); 660 ndconf.kda_af = AF_INET; 661 } 662 663 #ifdef HAVE_CRYPTO 664 if (pubkeyfile != NULL) { 665 kdap->kda_encryption = cipher; 666 genkey(pubkeyfile, kdap); 667 } 668 #endif 669 error = ioctl(fd, DIOCSKERNELDUMP, kdap); 670 if (error != 0) 671 error = errno; 672 if (error == EINVAL && (gzip || zstd)) { 673 /* Retry without compression in case kernel lacks support. */ 674 kdap->kda_compression = KERNELDUMP_COMP_NONE; 675 error = ioctl(fd, DIOCSKERNELDUMP, kdap); 676 if (error == 0) 677 warnx("Compression disabled; kernel may lack gzip or zstd support."); 678 else 679 error = errno; 680 } 681 /* Emit a warning if the user configured a downed interface. */ 682 if (error == 0 && netdump) 683 check_link_status(kdap->kda_iface); 684 explicit_bzero(kdap->kda_encryptedkey, kdap->kda_encryptedkeysize); 685 free(kdap->kda_encryptedkey); 686 explicit_bzero(kdap, sizeof(*kdap)); 687 if (error != 0) { 688 if (netdump) { 689 /* 690 * Be slightly less user-hostile for some common 691 * errors, especially as users don't have any great 692 * discoverability into which NICs support netdump. 693 */ 694 if (error == ENODEV) 695 errx(EX_OSERR, "Unable to configure netdump " 696 "because the interface driver does not yet " 697 "support netdump."); 698 } 699 errc(EX_OSERR, error, "ioctl(DIOCSKERNELDUMP)"); 700 } 701 702 if (verbose) 703 listdumpdev(); 704 705 exit(EX_OK); 706 } 707