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vendor/OPENSSH: upgrade from 8.8p1 top 9.1p1
[dragonfly.git] / crypto / openssh / ssh-keyscan.c
blobd7283136c7d29960a08ebadb5c63a5344d7028e4
1 /* $OpenBSD: ssh-keyscan.c,v 1.146 2022/08/19 04:02:46 dtucker Exp $ */
2 /*
3 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
4 *
5 * Modification and redistribution in source and binary forms is
6 * permitted provided that due credit is given to the author and the
7 * OpenBSD project by leaving this copyright notice intact.
8 */
9
10 #include "includes.h"
11
12 #include <sys/types.h>
13 #include "openbsd-compat/sys-queue.h"
14 #include <sys/resource.h>
15 #ifdef HAVE_SYS_TIME_H
16 # include <sys/time.h>
17 #endif
18
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21
22 #ifdef WITH_OPENSSL
23 #include <openssl/bn.h>
24 #endif
25
26 #include <netdb.h>
27 #include <errno.h>
28 #ifdef HAVE_POLL_H
29 #include <poll.h>
30 #endif
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <signal.h>
35 #include <string.h>
36 #include <unistd.h>
37
38 #include "xmalloc.h"
39 #include "ssh.h"
40 #include "sshbuf.h"
41 #include "sshkey.h"
42 #include "cipher.h"
43 #include "kex.h"
44 #include "compat.h"
45 #include "myproposal.h"
46 #include "packet.h"
47 #include "dispatch.h"
48 #include "log.h"
49 #include "atomicio.h"
50 #include "misc.h"
51 #include "hostfile.h"
52 #include "ssherr.h"
53 #include "ssh_api.h"
54 #include "dns.h"
55
56 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
57 Default value is AF_UNSPEC means both IPv4 and IPv6. */
58 int IPv4or6 = AF_UNSPEC;
59
60 int ssh_port = SSH_DEFAULT_PORT;
61
62 #define KT_DSA (1)
63 #define KT_RSA (1<<1)
64 #define KT_ECDSA (1<<2)
65 #define KT_ED25519 (1<<3)
66 #define KT_XMSS (1<<4)
67 #define KT_ECDSA_SK (1<<5)
68 #define KT_ED25519_SK (1<<6)
69
70 #define KT_MIN KT_DSA
71 #define KT_MAX KT_ED25519_SK
72
73 int get_cert = 0;
74 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
75
76 int hash_hosts = 0; /* Hash hostname on output */
77
78 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
79
80 int found_one = 0; /* Successfully found a key */
81
82 #define MAXMAXFD 256
83
84 /* The number of seconds after which to give up on a TCP connection */
85 int timeout = 5;
86
87 int maxfd;
88 #define MAXCON (maxfd - 10)
89
90 extern char *__progname;
91 struct pollfd *read_wait;
92 int ncon;
93
94 /*
95 * Keep a connection structure for each file descriptor. The state
96 * associated with file descriptor n is held in fdcon[n].
97 */
98 typedef struct Connection {
99 u_char c_status; /* State of connection on this file desc. */
100 #define CS_UNUSED 0 /* File descriptor unused */
101 #define CS_CON 1 /* Waiting to connect/read greeting */
102 #define CS_SIZE 2 /* Waiting to read initial packet size */
103 #define CS_KEYS 3 /* Waiting to read public key packet */
104 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
105 int c_plen; /* Packet length field for ssh packet */
106 int c_len; /* Total bytes which must be read. */
107 int c_off; /* Length of data read so far. */
108 int c_keytype; /* Only one of KT_* */
109 sig_atomic_t c_done; /* SSH2 done */
110 char *c_namebase; /* Address to free for c_name and c_namelist */
111 char *c_name; /* Hostname of connection for errors */
112 char *c_namelist; /* Pointer to other possible addresses */
113 char *c_output_name; /* Hostname of connection for output */
114 char *c_data; /* Data read from this fd */
115 struct ssh *c_ssh; /* SSH-connection */
116 struct timespec c_ts; /* Time at which connection gets aborted */
117 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
118 } con;
119
120 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
121 con *fdcon;
122
123 static void keyprint(con *c, struct sshkey *key);
124
125 static int
126 fdlim_get(int hard)
127 {
128 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
129 struct rlimit rlfd;
130
131 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
132 return (-1);
133 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
134 return SSH_SYSFDMAX;
135 else
136 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
137 #else
138 return SSH_SYSFDMAX;
139 #endif
140 }
141
142 static int
143 fdlim_set(int lim)
144 {
145 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
146 struct rlimit rlfd;
147 #endif
148
149 if (lim <= 0)
150 return (-1);
151 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
152 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
153 return (-1);
154 rlfd.rlim_cur = lim;
155 if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
156 return (-1);
157 #elif defined (HAVE_SETDTABLESIZE)
158 setdtablesize(lim);
159 #endif
160 return (0);
161 }
162
163 /*
164 * This is an strsep function that returns a null field for adjacent
165 * separators. This is the same as the 4.4BSD strsep, but different from the
166 * one in the GNU libc.
167 */
168 static char *
169 xstrsep(char **str, const char *delim)
170 {
171 char *s, *e;
172
173 if (!**str)
174 return (NULL);
175
176 s = *str;
177 e = s + strcspn(s, delim);
178
179 if (*e != '\0')
180 *e++ = '\0';
181 *str = e;
182
183 return (s);
184 }
185
186 /*
187 * Get the next non-null token (like GNU strsep). Strsep() will return a
188 * null token for two adjacent separators, so we may have to loop.
189 */
190 static char *
191 strnnsep(char **stringp, char *delim)
192 {
193 char *tok;
194
195 do {
196 tok = xstrsep(stringp, delim);
197 } while (tok && *tok == '\0');
198 return (tok);
199 }
200
201
202 static int
203 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
204 {
205 con *c;
206
207 if ((c = ssh_get_app_data(ssh)) != NULL)
208 keyprint(c, hostkey);
209 /* always abort key exchange */
210 return -1;
211 }
212
213 static int
214 ssh2_capable(int remote_major, int remote_minor)
215 {
216 switch (remote_major) {
217 case 1:
218 if (remote_minor == 99)
219 return 1;
220 break;
221 case 2:
222 return 1;
223 default:
224 break;
225 }
226 return 0;
227 }
228
229 static void
230 keygrab_ssh2(con *c)
231 {
232 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
233 int r;
234
235 switch (c->c_keytype) {
236 case KT_DSA:
237 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
238 "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
239 break;
240 case KT_RSA:
241 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
242 "rsa-sha2-512-cert-v01@openssh.com,"
243 "rsa-sha2-256-cert-v01@openssh.com,"
244 "ssh-rsa-cert-v01@openssh.com" :
245 "rsa-sha2-512,"
246 "rsa-sha2-256,"
247 "ssh-rsa";
248 break;
249 case KT_ED25519:
250 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
251 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
252 break;
253 case KT_XMSS:
254 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
255 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
256 break;
257 case KT_ECDSA:
258 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
259 "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
260 "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
261 "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
262 "ecdsa-sha2-nistp256,"
263 "ecdsa-sha2-nistp384,"
264 "ecdsa-sha2-nistp521";
265 break;
266 case KT_ECDSA_SK:
267 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
268 "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
269 "sk-ecdsa-sha2-nistp256@openssh.com";
270 break;
271 case KT_ED25519_SK:
272 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
273 "sk-ssh-ed25519-cert-v01@openssh.com" :
274 "sk-ssh-ed25519@openssh.com";
275 break;
276 default:
277 fatal("unknown key type %d", c->c_keytype);
278 break;
279 }
280 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
281 free(c->c_ssh);
282 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
283 exit(1);
284 }
285 #ifdef WITH_OPENSSL
286 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
287 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
288 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
289 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
290 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
291 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
292 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
293 # ifdef OPENSSL_HAS_ECC
294 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
295 # endif
296 #endif
297 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
298 c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
299 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
300 /*
301 * do the key-exchange until an error occurs or until
302 * the key_print_wrapper() callback sets c_done.
303 */
304 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
305 }
306
307 static void
308 keyprint_one(const char *host, struct sshkey *key)
309 {
310 char *hostport = NULL, *hashed = NULL;
311 const char *known_host;
312
313 found_one = 1;
314
315 if (print_sshfp) {
316 export_dns_rr(host, key, stdout, 0);
317 return;
318 }
319
320 hostport = put_host_port(host, ssh_port);
321 lowercase(hostport);
322 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
323 fatal("host_hash failed");
324 known_host = hash_hosts ? hashed : hostport;
325 if (!get_cert)
326 fprintf(stdout, "%s ", known_host);
327 sshkey_write(key, stdout);
328 fputs("\n", stdout);
329 free(hashed);
330 free(hostport);
331 }
332
333 static void
334 keyprint(con *c, struct sshkey *key)
335 {
336 char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
337 char *host, *ohosts;
338
339 if (key == NULL)
340 return;
341 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
342 keyprint_one(hosts, key);
343 return;
344 }
345 ohosts = hosts = xstrdup(hosts);
346 while ((host = strsep(&hosts, ",")) != NULL)
347 keyprint_one(host, key);
348 free(ohosts);
349 }
350
351 static int
352 tcpconnect(char *host)
353 {
354 struct addrinfo hints, *ai, *aitop;
355 char strport[NI_MAXSERV];
356 int gaierr, s = -1;
357
358 snprintf(strport, sizeof strport, "%d", ssh_port);
359 memset(&hints, 0, sizeof(hints));
360 hints.ai_family = IPv4or6;
361 hints.ai_socktype = SOCK_STREAM;
362 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
363 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
364 return -1;
365 }
366 for (ai = aitop; ai; ai = ai->ai_next) {
367 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
368 if (s == -1) {
369 error("socket: %s", strerror(errno));
370 continue;
371 }
372 if (set_nonblock(s) == -1)
373 fatal_f("set_nonblock(%d)", s);
374 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
375 errno != EINPROGRESS)
376 error("connect (`%s'): %s", host, strerror(errno));
377 else
378 break;
379 close(s);
380 s = -1;
381 }
382 freeaddrinfo(aitop);
383 return s;
384 }
385
386 static int
387 conalloc(char *iname, char *oname, int keytype)
388 {
389 char *namebase, *name, *namelist;
390 int s;
391
392 namebase = namelist = xstrdup(iname);
393
394 do {
395 name = xstrsep(&namelist, ",");
396 if (!name) {
397 free(namebase);
398 return (-1);
399 }
400 } while ((s = tcpconnect(name)) < 0);
401
402 if (s >= maxfd)
403 fatal("conalloc: fdno %d too high", s);
404 if (fdcon[s].c_status)
405 fatal("conalloc: attempt to reuse fdno %d", s);
406
407 debug3_f("oname %s kt %d", oname, keytype);
408 fdcon[s].c_fd = s;
409 fdcon[s].c_status = CS_CON;
410 fdcon[s].c_namebase = namebase;
411 fdcon[s].c_name = name;
412 fdcon[s].c_namelist = namelist;
413 fdcon[s].c_output_name = xstrdup(oname);
414 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
415 fdcon[s].c_len = 4;
416 fdcon[s].c_off = 0;
417 fdcon[s].c_keytype = keytype;
418 monotime_ts(&fdcon[s].c_ts);
419 fdcon[s].c_ts.tv_sec += timeout;
420 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
421 read_wait[s].fd = s;
422 read_wait[s].events = POLLIN;
423 ncon++;
424 return (s);
425 }
426
427 static void
428 confree(int s)
429 {
430 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
431 fatal("confree: attempt to free bad fdno %d", s);
432 free(fdcon[s].c_namebase);
433 free(fdcon[s].c_output_name);
434 if (fdcon[s].c_status == CS_KEYS)
435 free(fdcon[s].c_data);
436 fdcon[s].c_status = CS_UNUSED;
437 fdcon[s].c_keytype = 0;
438 if (fdcon[s].c_ssh) {
439 ssh_packet_close(fdcon[s].c_ssh);
440 free(fdcon[s].c_ssh);
441 fdcon[s].c_ssh = NULL;
442 } else
443 close(s);
444 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
445 read_wait[s].fd = -1;
446 read_wait[s].events = 0;
447 ncon--;
448 }
449
450 static void
451 contouch(int s)
452 {
453 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
454 monotime_ts(&fdcon[s].c_ts);
455 fdcon[s].c_ts.tv_sec += timeout;
456 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
457 }
458
459 static int
460 conrecycle(int s)
461 {
462 con *c = &fdcon[s];
463 int ret;
464
465 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
466 confree(s);
467 return (ret);
468 }
469
470 static void
471 congreet(int s)
472 {
473 int n = 0, remote_major = 0, remote_minor = 0;
474 char buf[256], *cp;
475 char remote_version[sizeof buf];
476 size_t bufsiz;
477 con *c = &fdcon[s];
478
479 /* send client banner */
480 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
481 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
482 if (n < 0 || (size_t)n >= sizeof(buf)) {
483 error("snprintf: buffer too small");
484 confree(s);
485 return;
486 }
487 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
488 error("write (%s): %s", c->c_name, strerror(errno));
489 confree(s);
490 return;
491 }
492
493 /*
494 * Read the server banner as per RFC4253 section 4.2. The "SSH-"
495 * protocol identification string may be preceeded by an arbitarily
496 * large banner which we must read and ignore. Loop while reading
497 * newline-terminated lines until we have one starting with "SSH-".
498 * The ID string cannot be longer than 255 characters although the
499 * preceeding banner lines may (in which case they'll be discarded
500 * in multiple iterations of the outer loop).
501 */
502 for (;;) {
503 memset(buf, '\0', sizeof(buf));
504 bufsiz = sizeof(buf);
505 cp = buf;
506 while (bufsiz-- &&
507 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
508 if (*cp == '\r')
509 *cp = '\n';
510 cp++;
511 }
512 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
513 break;
514 }
515 if (n == 0) {
516 switch (errno) {
517 case EPIPE:
518 error("%s: Connection closed by remote host", c->c_name);
519 break;
520 case ECONNREFUSED:
521 break;
522 default:
523 error("read (%s): %s", c->c_name, strerror(errno));
524 break;
525 }
526 conrecycle(s);
527 return;
528 }
529 if (cp >= buf + sizeof(buf)) {
530 error("%s: greeting exceeds allowable length", c->c_name);
531 confree(s);
532 return;
533 }
534 if (*cp != '\n' && *cp != '\r') {
535 error("%s: bad greeting", c->c_name);
536 confree(s);
537 return;
538 }
539 *cp = '\0';
540 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
541 fatal("ssh_packet_set_connection failed");
542 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
543 ssh_set_app_data(c->c_ssh, c); /* back link */
544 c->c_ssh->compat = 0;
545 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
546 &remote_major, &remote_minor, remote_version) == 3)
547 compat_banner(c->c_ssh, remote_version);
548 if (!ssh2_capable(remote_major, remote_minor)) {
549 debug("%s doesn't support ssh2", c->c_name);
550 confree(s);
551 return;
552 }
553 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
554 c->c_name, ssh_port, chop(buf));
555 keygrab_ssh2(c);
556 confree(s);
557 }
558
559 static void
560 conread(int s)
561 {
562 con *c = &fdcon[s];
563 size_t n;
564
565 if (c->c_status == CS_CON) {
566 congreet(s);
567 return;
568 }
569 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
570 if (n == 0) {
571 error("read (%s): %s", c->c_name, strerror(errno));
572 confree(s);
573 return;
574 }
575 c->c_off += n;
576
577 if (c->c_off == c->c_len)
578 switch (c->c_status) {
579 case CS_SIZE:
580 c->c_plen = htonl(c->c_plen);
581 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
582 c->c_off = 0;
583 c->c_data = xmalloc(c->c_len);
584 c->c_status = CS_KEYS;
585 break;
586 default:
587 fatal("conread: invalid status %d", c->c_status);
588 break;
589 }
590
591 contouch(s);
592 }
593
594 static void
595 conloop(void)
596 {
597 struct timespec seltime, now;
598 con *c;
599 int i;
600
601 monotime_ts(&now);
602 c = TAILQ_FIRST(&tq);
603
604 if (c && timespeccmp(&c->c_ts, &now, >))
605 timespecsub(&c->c_ts, &now, &seltime);
606 else
607 timespecclear(&seltime);
608
609 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
610 if (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)
611 continue;
612 error("poll error");
613 }
614
615 for (i = 0; i < maxfd; i++) {
616 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
617 confree(i);
618 else if (read_wait[i].revents & (POLLIN|POLLHUP))
619 conread(i);
620 }
621
622 c = TAILQ_FIRST(&tq);
623 while (c && timespeccmp(&c->c_ts, &now, <)) {
624 int s = c->c_fd;
625
626 c = TAILQ_NEXT(c, c_link);
627 conrecycle(s);
628 }
629 }
630
631 static void
632 do_host(char *host)
633 {
634 char *name = strnnsep(&host, " \t\n");
635 int j;
636
637 if (name == NULL)
638 return;
639 for (j = KT_MIN; j <= KT_MAX; j *= 2) {
640 if (get_keytypes & j) {
641 while (ncon >= MAXCON)
642 conloop();
643 conalloc(name, *host ? host : name, j);
644 }
645 }
646 }
647
648 void
649 sshfatal(const char *file, const char *func, int line, int showfunc,
650 LogLevel level, const char *suffix, const char *fmt, ...)
651 {
652 va_list args;
653
654 va_start(args, fmt);
655 sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
656 va_end(args);
657 cleanup_exit(255);
658 }
659
660 static void
661 usage(void)
662 {
663 fprintf(stderr,
664 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
665 "\t\t [host | addrlist namelist]\n",
666 __progname);
667 exit(1);
668 }
669
670 int
671 main(int argc, char **argv)
672 {
673 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
674 int opt, fopt_count = 0, j;
675 char *tname, *cp, *line = NULL;
676 size_t linesize = 0;
677 FILE *fp;
678
679 extern int optind;
680 extern char *optarg;
681
682 __progname = ssh_get_progname(argv[0]);
683 seed_rng();
684 TAILQ_INIT(&tq);
685
686 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
687 sanitise_stdfd();
688
689 if (argc <= 1)
690 usage();
691
692 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
693 switch (opt) {
694 case 'H':
695 hash_hosts = 1;
696 break;
697 case 'c':
698 get_cert = 1;
699 break;
700 case 'D':
701 print_sshfp = 1;
702 break;
703 case 'p':
704 ssh_port = a2port(optarg);
705 if (ssh_port <= 0) {
706 fprintf(stderr, "Bad port '%s'\n", optarg);
707 exit(1);
708 }
709 break;
710 case 'T':
711 timeout = convtime(optarg);
712 if (timeout == -1 || timeout == 0) {
713 fprintf(stderr, "Bad timeout '%s'\n", optarg);
714 usage();
715 }
716 break;
717 case 'v':
718 if (!debug_flag) {
719 debug_flag = 1;
720 log_level = SYSLOG_LEVEL_DEBUG1;
721 }
722 else if (log_level < SYSLOG_LEVEL_DEBUG3)
723 log_level++;
724 else
725 fatal("Too high debugging level.");
726 break;
727 case 'f':
728 if (strcmp(optarg, "-") == 0)
729 optarg = NULL;
730 argv[fopt_count++] = optarg;
731 break;
732 case 't':
733 get_keytypes = 0;
734 tname = strtok(optarg, ",");
735 while (tname) {
736 int type = sshkey_type_from_name(tname);
737
738 switch (type) {
739 case KEY_DSA:
740 get_keytypes |= KT_DSA;
741 break;
742 case KEY_ECDSA:
743 get_keytypes |= KT_ECDSA;
744 break;
745 case KEY_RSA:
746 get_keytypes |= KT_RSA;
747 break;
748 case KEY_ED25519:
749 get_keytypes |= KT_ED25519;
750 break;
751 case KEY_XMSS:
752 get_keytypes |= KT_XMSS;
753 break;
754 case KEY_ED25519_SK:
755 get_keytypes |= KT_ED25519_SK;
756 break;
757 case KEY_ECDSA_SK:
758 get_keytypes |= KT_ECDSA_SK;
759 break;
760 case KEY_UNSPEC:
761 default:
762 fatal("Unknown key type \"%s\"", tname);
763 }
764 tname = strtok(NULL, ",");
765 }
766 break;
767 case '4':
768 IPv4or6 = AF_INET;
769 break;
770 case '6':
771 IPv4or6 = AF_INET6;
772 break;
773 case '?':
774 default:
775 usage();
776 }
777 }
778 if (optind == argc && !fopt_count)
779 usage();
780
781 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
782
783 maxfd = fdlim_get(1);
784 if (maxfd < 0)
785 fatal("%s: fdlim_get: bad value", __progname);
786 if (maxfd > MAXMAXFD)
787 maxfd = MAXMAXFD;
788 if (MAXCON <= 0)
789 fatal("%s: not enough file descriptors", __progname);
790 if (maxfd > fdlim_get(0))
791 fdlim_set(maxfd);
792 fdcon = xcalloc(maxfd, sizeof(con));
793 read_wait = xcalloc(maxfd, sizeof(struct pollfd));
794 for (j = 0; j < maxfd; j++)
795 read_wait[j].fd = -1;
796
797 for (j = 0; j < fopt_count; j++) {
798 if (argv[j] == NULL)
799 fp = stdin;
800 else if ((fp = fopen(argv[j], "r")) == NULL)
801 fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
802
803 while (getline(&line, &linesize, fp) != -1) {
804 /* Chomp off trailing whitespace and comments */
805 if ((cp = strchr(line, '#')) == NULL)
806 cp = line + strlen(line) - 1;
807 while (cp >= line) {
808 if (*cp == ' ' || *cp == '\t' ||
809 *cp == '\n' || *cp == '#')
810 *cp-- = '\0';
811 else
812 break;
813 }
814
815 /* Skip empty lines */
816 if (*line == '\0')
817 continue;
818
819 do_host(line);
820 }
821
822 if (ferror(fp))
823 fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
824
825 fclose(fp);
826 }
827 free(line);
828
829 while (optind < argc)
830 do_host(argv[optind++]);
831
832 while (ncon > 0)
833 conloop();
834
835 return found_one ? 0 : 1;
836 }
DragonFly BSD