1 /* $OpenBSD: ssh-keyscan.c,v 1.167 2025/08/29 03:50:38 djm 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 <sys/socket.h>
14 #include <sys/queue.h>
15 #include <sys/time.h>
16 #include <sys/resource.h>
17
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
20
21 #ifdef WITH_OPENSSL
22 #include <openssl/bn.h>
23 #endif
24
25 #include <errno.h>
26 #include <limits.h>
27 #include <netdb.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <poll.h>
32 #include <signal.h>
33 #include <string.h>
34 #include <unistd.h>
35
36 #include "xmalloc.h"
37 #include "ssh.h"
38 #include "sshbuf.h"
39 #include "sshkey.h"
40 #include "cipher.h"
41 #include "digest.h"
42 #include "kex.h"
43 #include "compat.h"
44 #include "myproposal.h"
45 #include "packet.h"
46 #include "dispatch.h"
47 #include "log.h"
48 #include "atomicio.h"
49 #include "misc.h"
50 #include "hostfile.h"
51 #include "ssherr.h"
52 #include "ssh_api.h"
53 #include "dns.h"
54 #include "addr.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_RSA (1)
63 #define KT_ECDSA (1<<1)
64 #define KT_ED25519 (1<<2)
65 #define KT_ECDSA_SK (1<<4)
66 #define KT_ED25519_SK (1<<5)
67
68 #define KT_MIN KT_RSA
69 #define KT_MAX KT_ED25519_SK
70
71 int get_cert = 0;
72 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
73
74 int hash_hosts = 0; /* Hash hostname on output */
75
76 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
77
78 int found_one = 0; /* Successfully found a key */
79
80 int hashalg = -1; /* Hash for SSHFP records or -1 for all */
81
82 int quiet = 0; /* Don't print key comment lines */
83
84 #define MAXMAXFD 256
85
86 /* The number of seconds after which to give up on a TCP connection */
87 int timeout = 5;
88
89 int maxfd;
90 #define MAXCON (maxfd - 10)
91
92 extern char *__progname;
93 struct pollfd *read_wait;
94 int ncon;
95
96 /*
97 * Keep a connection structure for each file descriptor. The state
98 * associated with file descriptor n is held in fdcon[n].
99 */
100 typedef struct Connection {
101 u_char c_status; /* State of connection on this file desc. */
102 #define CS_UNUSED 0 /* File descriptor unused */
103 #define CS_CON 1 /* Waiting to connect/read greeting */
104 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
105 int c_keytype; /* Only one of KT_* */
106 sig_atomic_t c_done; /* SSH2 done */
107 char *c_namebase; /* Address to free for c_name and c_namelist */
108 char *c_name; /* Hostname of connection for errors */
109 char *c_namelist; /* Pointer to other possible addresses */
110 char *c_output_name; /* Hostname of connection for output */
111 struct ssh *c_ssh; /* SSH-connection */
112 struct timespec c_ts; /* Time at which connection gets aborted */
113 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
114 } con;
115
116 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
117 con *fdcon;
118
119 static void keyprint(con *c, struct sshkey *key);
120
121 static int
fdlim_get(int hard)122 fdlim_get(int hard)
123 {
124 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
125 struct rlimit rlfd;
126 rlim_t lim;
127
128 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
129 return -1;
130 lim = hard ? rlfd.rlim_max : rlfd.rlim_cur;
131 if (lim <= 0)
132 return -1;
133 if (lim == RLIM_INFINITY)
134 lim = SSH_SYSFDMAX;
135 if (lim >= INT_MAX)
136 lim = INT_MAX;
137 return lim;
138 #else
139 return (SSH_SYSFDMAX <= 0) ? -1 :
140 ((SSH_SYSFDMAX >= INT_MAX) ? INT_MAX : SSH_SYSFDMAX);
141 #endif
142 }
143
144 static int
fdlim_set(int lim)145 fdlim_set(int lim)
146 {
147 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
148 struct rlimit rlfd;
149 #endif
150
151 if (lim <= 0)
152 return (-1);
153 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
154 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
155 return (-1);
156 rlfd.rlim_cur = lim;
157 if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
158 return (-1);
159 #elif defined (HAVE_SETDTABLESIZE)
160 setdtablesize(lim);
161 #endif
162 return (0);
163 }
164
165 /*
166 * This is an strsep function that returns a null field for adjacent
167 * separators. This is the same as the 4.4BSD strsep, but different from the
168 * one in the GNU libc.
169 */
170 static char *
xstrsep(char ** str,const char * delim)171 xstrsep(char **str, const char *delim)
172 {
173 char *s, *e;
174
175 if (!**str)
176 return (NULL);
177
178 s = *str;
179 e = s + strcspn(s, delim);
180
181 if (*e != '\0')
182 *e++ = '\0';
183 *str = e;
184
185 return (s);
186 }
187
188 /*
189 * Get the next non-null token (like GNU strsep). Strsep() will return a
190 * null token for two adjacent separators, so we may have to loop.
191 */
192 static char *
strnnsep(char ** stringp,char * delim)193 strnnsep(char **stringp, char *delim)
194 {
195 char *tok;
196
197 do {
198 tok = xstrsep(stringp, delim);
199 } while (tok && *tok == '\0');
200 return (tok);
201 }
202
203
204 static int
key_print_wrapper(struct sshkey * hostkey,struct ssh * ssh)205 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
206 {
207 con *c;
208
209 if ((c = ssh_get_app_data(ssh)) != NULL)
210 keyprint(c, hostkey);
211 /* always abort key exchange */
212 return -1;
213 }
214
215 static int
ssh2_capable(int remote_major,int remote_minor)216 ssh2_capable(int remote_major, int remote_minor)
217 {
218 switch (remote_major) {
219 case 1:
220 if (remote_minor == 99)
221 return 1;
222 break;
223 case 2:
224 return 1;
225 default:
226 break;
227 }
228 return 0;
229 }
230
231 static void
keygrab_ssh2(con * c)232 keygrab_ssh2(con *c)
233 {
234 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
235 int r;
236
237 switch (c->c_keytype) {
238 case KT_RSA:
239 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
240 "rsa-sha2-512-cert-v01@openssh.com,"
241 "rsa-sha2-256-cert-v01@openssh.com,"
242 "ssh-rsa-cert-v01@openssh.com" :
243 "rsa-sha2-512,"
244 "rsa-sha2-256,"
245 "ssh-rsa";
246 break;
247 case KT_ED25519:
248 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
249 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
250 break;
251 case KT_ECDSA:
252 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
253 "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
254 "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
255 "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
256 "ecdsa-sha2-nistp256,"
257 "ecdsa-sha2-nistp384,"
258 "ecdsa-sha2-nistp521";
259 break;
260 case KT_ECDSA_SK:
261 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
262 "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
263 "sk-ecdsa-sha2-nistp256@openssh.com";
264 break;
265 case KT_ED25519_SK:
266 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
267 "sk-ssh-ed25519-cert-v01@openssh.com" :
268 "sk-ssh-ed25519@openssh.com";
269 break;
270 default:
271 fatal("unknown key type %d", c->c_keytype);
272 break;
273 }
274 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
275 free(c->c_ssh);
276 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
277 exit(1);
278 }
279 #ifdef WITH_OPENSSL
280 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
281 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
282 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
283 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
284 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
285 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
286 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
287 # ifdef OPENSSL_HAS_ECC
288 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
289 # endif
290 #endif
291 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
292 c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
293 c->c_ssh->kex->kex[KEX_KEM_MLKEM768X25519_SHA256] = kex_gen_client;
294 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
295 /*
296 * do the key-exchange until an error occurs or until
297 * the key_print_wrapper() callback sets c_done.
298 */
299 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
300 }
301
302 static void
keyprint_one(const char * host,struct sshkey * key)303 keyprint_one(const char *host, struct sshkey *key)
304 {
305 char *hostport = NULL, *hashed = NULL;
306 const char *known_host;
307 int r = 0;
308
309 found_one = 1;
310
311 if (print_sshfp) {
312 export_dns_rr(host, key, stdout, 0, hashalg);
313 return;
314 }
315
316 hostport = put_host_port(host, ssh_port);
317 lowercase(hostport);
318 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
319 fatal("host_hash failed");
320 known_host = hash_hosts ? hashed : hostport;
321 if (!get_cert)
322 r = fprintf(stdout, "%s ", known_host);
323 if (r >= 0 && sshkey_write(key, stdout) == 0)
324 (void)fputs("\n", stdout);
325 free(hashed);
326 free(hostport);
327 }
328
329 static void
keyprint(con * c,struct sshkey * key)330 keyprint(con *c, struct sshkey *key)
331 {
332 char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
333 char *host, *ohosts;
334
335 if (key == NULL)
336 return;
337 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
338 keyprint_one(hosts, key);
339 return;
340 }
341 ohosts = hosts = xstrdup(hosts);
342 while ((host = strsep(&hosts, ",")) != NULL)
343 keyprint_one(host, key);
344 free(ohosts);
345 }
346
347 static int
tcpconnect(char * host)348 tcpconnect(char *host)
349 {
350 struct addrinfo hints, *ai, *aitop;
351 char strport[NI_MAXSERV];
352 int gaierr, s = -1;
353
354 snprintf(strport, sizeof strport, "%d", ssh_port);
355 memset(&hints, 0, sizeof(hints));
356 hints.ai_family = IPv4or6;
357 hints.ai_socktype = SOCK_STREAM;
358 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
359 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
360 return -1;
361 }
362 for (ai = aitop; ai; ai = ai->ai_next) {
363 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
364 if (s == -1) {
365 error("socket: %s", strerror(errno));
366 continue;
367 }
368 if (set_nonblock(s) == -1)
369 fatal_f("set_nonblock(%d)", s);
370 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
371 errno != EINPROGRESS)
372 error("connect (`%s'): %s", host, strerror(errno));
373 else
374 break;
375 close(s);
376 s = -1;
377 }
378 freeaddrinfo(aitop);
379 return s;
380 }
381
382 static int
conalloc(const char * iname,const char * oname,int keytype)383 conalloc(const char *iname, const char *oname, int keytype)
384 {
385 char *namebase, *name, *namelist;
386 int s;
387
388 namebase = namelist = xstrdup(iname);
389
390 do {
391 name = xstrsep(&namelist, ",");
392 if (!name) {
393 free(namebase);
394 return (-1);
395 }
396 } while ((s = tcpconnect(name)) < 0);
397
398 if (s >= maxfd)
399 fatal("conalloc: fdno %d too high", s);
400 if (fdcon[s].c_status)
401 fatal("conalloc: attempt to reuse fdno %d", s);
402
403 debug3_f("oname %s kt %d", oname, keytype);
404 fdcon[s].c_fd = s;
405 fdcon[s].c_status = CS_CON;
406 fdcon[s].c_namebase = namebase;
407 fdcon[s].c_name = name;
408 fdcon[s].c_namelist = namelist;
409 fdcon[s].c_output_name = xstrdup(oname);
410 fdcon[s].c_keytype = keytype;
411 monotime_ts(&fdcon[s].c_ts);
412 fdcon[s].c_ts.tv_sec += timeout;
413 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
414 read_wait[s].fd = s;
415 read_wait[s].events = POLLIN;
416 ncon++;
417 return (s);
418 }
419
420 static void
confree(int s)421 confree(int s)
422 {
423 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
424 fatal("confree: attempt to free bad fdno %d", s);
425 free(fdcon[s].c_namebase);
426 free(fdcon[s].c_output_name);
427 fdcon[s].c_status = CS_UNUSED;
428 fdcon[s].c_keytype = 0;
429 if (fdcon[s].c_ssh) {
430 ssh_packet_close(fdcon[s].c_ssh);
431 free(fdcon[s].c_ssh);
432 fdcon[s].c_ssh = NULL;
433 } else
434 close(s);
435 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
436 read_wait[s].fd = -1;
437 read_wait[s].events = 0;
438 ncon--;
439 }
440
441 static int
conrecycle(int s)442 conrecycle(int s)
443 {
444 con *c = &fdcon[s];
445 int ret;
446
447 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
448 confree(s);
449 return (ret);
450 }
451
452 static void
congreet(int s)453 congreet(int s)
454 {
455 int n = 0, remote_major = 0, remote_minor = 0;
456 char buf[256], *cp;
457 char remote_version[sizeof buf];
458 size_t bufsiz;
459 con *c = &fdcon[s];
460
461 /* send client banner */
462 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
463 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
464 if (n < 0 || (size_t)n >= sizeof(buf)) {
465 error("snprintf: buffer too small");
466 confree(s);
467 return;
468 }
469 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
470 error("write (%s): %s", c->c_name, strerror(errno));
471 confree(s);
472 return;
473 }
474
475 /*
476 * Read the server banner as per RFC4253 section 4.2. The "SSH-"
477 * protocol identification string may be preceded by an arbitrarily
478 * large banner which we must read and ignore. Loop while reading
479 * newline-terminated lines until we have one starting with "SSH-".
480 * The ID string cannot be longer than 255 characters although the
481 * preceding banner lines may (in which case they'll be discarded
482 * in multiple iterations of the outer loop).
483 */
484 for (;;) {
485 memset(buf, '\0', sizeof(buf));
486 bufsiz = sizeof(buf);
487 cp = buf;
488 while (bufsiz-- &&
489 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
490 if (*cp == '\r')
491 *cp = '\n';
492 cp++;
493 }
494 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
495 break;
496 }
497 if (n == 0) {
498 switch (errno) {
499 case EPIPE:
500 error("%s: Connection closed by remote host", c->c_name);
501 break;
502 case ECONNREFUSED:
503 break;
504 default:
505 error("read (%s): %s", c->c_name, strerror(errno));
506 break;
507 }
508 conrecycle(s);
509 return;
510 }
511 if (cp >= buf + sizeof(buf)) {
512 error("%s: greeting exceeds allowable length", c->c_name);
513 confree(s);
514 return;
515 }
516 if (*cp != '\n' && *cp != '\r') {
517 error("%s: bad greeting", c->c_name);
518 confree(s);
519 return;
520 }
521 *cp = '\0';
522 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
523 fatal("ssh_packet_set_connection failed");
524 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
525 ssh_set_app_data(c->c_ssh, c); /* back link */
526 c->c_ssh->compat = 0;
527 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
528 &remote_major, &remote_minor, remote_version) == 3)
529 compat_banner(c->c_ssh, remote_version);
530 if (!ssh2_capable(remote_major, remote_minor)) {
531 debug("%s doesn't support ssh2", c->c_name);
532 confree(s);
533 return;
534 }
535 if (!quiet) {
536 fprintf(stdout, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
537 c->c_name, ssh_port, chop(buf));
538 }
539 keygrab_ssh2(c);
540 confree(s);
541 }
542
543 static void
conread(int s)544 conread(int s)
545 {
546 con *c = &fdcon[s];
547
548 if (c->c_status != CS_CON)
549 fatal("conread: invalid status %d", c->c_status);
550
551 congreet(s);
552 }
553
554 static void
conloop(void)555 conloop(void)
556 {
557 struct timespec seltime, now;
558 con *c;
559 int i;
560
561 monotime_ts(&now);
562 c = TAILQ_FIRST(&tq);
563
564 if (c && timespeccmp(&c->c_ts, &now, >))
565 timespecsub(&c->c_ts, &now, &seltime);
566 else
567 timespecclear(&seltime);
568
569 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
570 if (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)
571 continue;
572 error("poll error");
573 }
574
575 for (i = 0; i < maxfd; i++) {
576 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
577 confree(i);
578 else if (read_wait[i].revents & (POLLIN))
579 conread(i);
580 }
581
582 c = TAILQ_FIRST(&tq);
583 while (c && timespeccmp(&c->c_ts, &now, <)) {
584 int s = c->c_fd;
585
586 c = TAILQ_NEXT(c, c_link);
587 conrecycle(s);
588 }
589 }
590
591 static void
do_one_host(char * host)592 do_one_host(char *host)
593 {
594 char *name = strnnsep(&host, " \t\n");
595 int j;
596
597 if (name == NULL)
598 return;
599 for (j = KT_MIN; j <= KT_MAX; j *= 2) {
600 if (get_keytypes & j) {
601 while (ncon >= MAXCON)
602 conloop();
603 conalloc(name, *host ? host : name, j);
604 }
605 }
606 }
607
608 static void
do_host(char * host)609 do_host(char *host)
610 {
611 char daddr[128];
612 struct xaddr addr, end_addr;
613 u_int masklen;
614
615 if (host == NULL)
616 return;
617 if (addr_pton_cidr(host, &addr, &masklen) != 0) {
618 /* Assume argument is a hostname */
619 do_one_host(host);
620 } else {
621 /* Argument is a CIDR range */
622 debug("CIDR range %s", host);
623 end_addr = addr;
624 if (addr_host_to_all1s(&end_addr, masklen) != 0)
625 goto badaddr;
626 /*
627 * Note: we deliberately include the all-zero/ones addresses.
628 */
629 for (;;) {
630 if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) {
631 badaddr:
632 error("Invalid address %s", host);
633 return;
634 }
635 debug("CIDR expand: address %s", daddr);
636 do_one_host(daddr);
637 if (addr_cmp(&addr, &end_addr) == 0)
638 break;
639 addr_increment(&addr);
640 }
641 }
642 }
643
644 static void
usage(void)645 usage(void)
646 {
647 fprintf(stderr,
648 "usage: ssh-keyscan [-46cDHqv] [-f file] [-O option] [-p port] [-T timeout]\n"
649 " [-t type] [host | addrlist namelist]\n");
650 exit(1);
651 }
652
653 int
main(int argc,char ** argv)654 main(int argc, char **argv)
655 {
656 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
657 int opt, fopt_count = 0, j;
658 char *tname, *cp, *line = NULL;
659 size_t linesize = 0;
660 FILE *fp;
661
662 extern int optind;
663 extern char *optarg;
664
665 __progname = ssh_get_progname(argv[0]);
666 seed_rng();
667 TAILQ_INIT(&tq);
668
669 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
670 sanitise_stdfd();
671
672 if (argc <= 1)
673 usage();
674
675 while ((opt = getopt(argc, argv, "cDHqv46O:p:T:t:f:")) != -1) {
676 switch (opt) {
677 case 'H':
678 hash_hosts = 1;
679 break;
680 case 'c':
681 get_cert = 1;
682 break;
683 case 'D':
684 print_sshfp = 1;
685 break;
686 case 'p':
687 ssh_port = a2port(optarg);
688 if (ssh_port <= 0) {
689 fprintf(stderr, "Bad port '%s'\n", optarg);
690 exit(1);
691 }
692 break;
693 case 'T':
694 timeout = convtime(optarg);
695 if (timeout == -1 || timeout == 0) {
696 fprintf(stderr, "Bad timeout '%s'\n", optarg);
697 usage();
698 }
699 break;
700 case 'v':
701 if (!debug_flag) {
702 debug_flag = 1;
703 log_level = SYSLOG_LEVEL_DEBUG1;
704 }
705 else if (log_level < SYSLOG_LEVEL_DEBUG3)
706 log_level++;
707 else
708 fatal("Too high debugging level.");
709 break;
710 case 'q':
711 quiet = 1;
712 break;
713 case 'f':
714 if (strcmp(optarg, "-") == 0)
715 optarg = NULL;
716 argv[fopt_count++] = optarg;
717 break;
718 case 'O':
719 /* Maybe other misc options in the future too */
720 if (strncmp(optarg, "hashalg=", 8) != 0)
721 fatal("Unsupported -O option");
722 if ((hashalg = ssh_digest_alg_by_name(
723 optarg + 8)) == -1)
724 fatal("Unsupported hash algorithm");
725 break;
726 case 't':
727 get_keytypes = 0;
728 tname = strtok(optarg, ",");
729 while (tname) {
730 int type = sshkey_type_from_shortname(tname);
731
732 switch (type) {
733 case KEY_ECDSA:
734 get_keytypes |= KT_ECDSA;
735 break;
736 case KEY_RSA:
737 get_keytypes |= KT_RSA;
738 break;
739 case KEY_ED25519:
740 get_keytypes |= KT_ED25519;
741 break;
742 case KEY_ED25519_SK:
743 get_keytypes |= KT_ED25519_SK;
744 break;
745 case KEY_ECDSA_SK:
746 get_keytypes |= KT_ECDSA_SK;
747 break;
748 case KEY_UNSPEC:
749 default:
750 fatal("Unknown key type \"%s\"", tname);
751 }
752 tname = strtok(NULL, ",");
753 }
754 break;
755 case '4':
756 IPv4or6 = AF_INET;
757 break;
758 case '6':
759 IPv4or6 = AF_INET6;
760 break;
761 default:
762 usage();
763 }
764 }
765 if (optind == argc && !fopt_count)
766 usage();
767
768 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
769
770 maxfd = fdlim_get(1);
771 if (maxfd < 0)
772 fatal("%s: fdlim_get: bad value", __progname);
773 if (maxfd > MAXMAXFD)
774 maxfd = MAXMAXFD;
775 if (MAXCON <= 0)
776 fatal("%s: not enough file descriptors", __progname);
777 if (maxfd > fdlim_get(0))
778 fdlim_set(maxfd);
779 fdcon = xcalloc(maxfd, sizeof(con));
780 read_wait = xcalloc(maxfd, sizeof(struct pollfd));
781 for (j = 0; j < maxfd; j++)
782 read_wait[j].fd = -1;
783
784 ssh_signal(SIGPIPE, SIG_IGN);
785 for (j = 0; j < fopt_count; j++) {
786 if (argv[j] == NULL)
787 fp = stdin;
788 else if ((fp = fopen(argv[j], "r")) == NULL)
789 fatal("%s: %s: %s", __progname,
790 fp == stdin ? "<stdin>" : argv[j], strerror(errno));
791
792 while (getline(&line, &linesize, fp) != -1) {
793 /* Chomp off trailing whitespace and comments */
794 if ((cp = strchr(line, '#')) == NULL)
795 cp = line + strlen(line) - 1;
796 while (cp >= line) {
797 if (*cp == ' ' || *cp == '\t' ||
798 *cp == '\n' || *cp == '#')
799 *cp-- = '\0';
800 else
801 break;
802 }
803
804 /* Skip empty lines */
805 if (*line == '\0')
806 continue;
807
808 do_host(line);
809 }
810
811 if (ferror(fp))
812 fatal("%s: %s: %s", __progname,
813 fp == stdin ? "<stdin>" : argv[j], strerror(errno));
814
815 if (fp != stdin)
816 fclose(fp);
817 }
818 free(line);
819
820 while (optind < argc)
821 do_host(argv[optind++]);
822
823 while (ncon > 0)
824 conloop();
825
826 return found_one ? 0 : 1;
827 }
828