1 /* $OpenBSD: ssh-keyscan.c,v 1.120 2018/06/06 18:29:18 markus Exp $ */
2 /*
3 * Copyright 1995, 1996 by David Mazieres <[email protected]>.
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 #include <openssl/bn.h>
23
24 #include <netdb.h>
25 #include <errno.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <signal.h>
30 #include <string.h>
31 #include <unistd.h>
32
33 #include "xmalloc.h"
34 #include "ssh.h"
35 #include "sshbuf.h"
36 #include "sshkey.h"
37 #include "cipher.h"
38 #include "kex.h"
39 #include "compat.h"
40 #include "myproposal.h"
41 #include "packet.h"
42 #include "dispatch.h"
43 #include "log.h"
44 #include "atomicio.h"
45 #include "misc.h"
46 #include "hostfile.h"
47 #include "ssherr.h"
48 #include "ssh_api.h"
49 #include "dns.h"
50
51 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
52 Default value is AF_UNSPEC means both IPv4 and IPv6. */
53 int IPv4or6 = AF_UNSPEC;
54
55 int ssh_port = SSH_DEFAULT_PORT;
56
57 #define KT_DSA (1)
58 #define KT_RSA (1<<1)
59 #define KT_ECDSA (1<<2)
60 #define KT_ED25519 (1<<3)
61 #define KT_XMSS (1<<4)
62
63 #define KT_MIN KT_DSA
64 #define KT_MAX KT_XMSS
65
66 int get_cert = 0;
67 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
68
69 int hash_hosts = 0; /* Hash hostname on output */
70
71 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
72
73 #define MAXMAXFD 256
74
75 /* The number of seconds after which to give up on a TCP connection */
76 int timeout = 5;
77
78 int maxfd;
79 #define MAXCON (maxfd - 10)
80
81 extern char *__progname;
82 fd_set *read_wait;
83 size_t read_wait_nfdset;
84 int ncon;
85
86 struct ssh *active_state = NULL; /* XXX needed for linking */
87
88 /*
89 * Keep a connection structure for each file descriptor. The state
90 * associated with file descriptor n is held in fdcon[n].
91 */
92 typedef struct Connection {
93 u_char c_status; /* State of connection on this file desc. */
94 #define CS_UNUSED 0 /* File descriptor unused */
95 #define CS_CON 1 /* Waiting to connect/read greeting */
96 #define CS_SIZE 2 /* Waiting to read initial packet size */
97 #define CS_KEYS 3 /* Waiting to read public key packet */
98 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
99 int c_plen; /* Packet length field for ssh packet */
100 int c_len; /* Total bytes which must be read. */
101 int c_off; /* Length of data read so far. */
102 int c_keytype; /* Only one of KT_* */
103 sig_atomic_t c_done; /* SSH2 done */
104 char *c_namebase; /* Address to free for c_name and c_namelist */
105 char *c_name; /* Hostname of connection for errors */
106 char *c_namelist; /* Pointer to other possible addresses */
107 char *c_output_name; /* Hostname of connection for output */
108 char *c_data; /* Data read from this fd */
109 struct ssh *c_ssh; /* SSH-connection */
110 struct timeval c_tv; /* Time at which connection gets aborted */
111 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
112 } con;
113
114 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
115 con *fdcon;
116
117 static void keyprint(con *c, struct sshkey *key);
118
119 static int
fdlim_get(int hard)120 fdlim_get(int hard)
121 {
122 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
123 struct rlimit rlfd;
124
125 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
126 return (-1);
127 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
128 return SSH_SYSFDMAX;
129 else
130 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
131 #else
132 return SSH_SYSFDMAX;
133 #endif
134 }
135
136 static int
fdlim_set(int lim)137 fdlim_set(int lim)
138 {
139 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
140 struct rlimit rlfd;
141 #endif
142
143 if (lim <= 0)
144 return (-1);
145 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
146 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
147 return (-1);
148 rlfd.rlim_cur = lim;
149 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
150 return (-1);
151 #elif defined (HAVE_SETDTABLESIZE)
152 setdtablesize(lim);
153 #endif
154 return (0);
155 }
156
157 /*
158 * This is an strsep function that returns a null field for adjacent
159 * separators. This is the same as the 4.4BSD strsep, but different from the
160 * one in the GNU libc.
161 */
162 static char *
xstrsep(char ** str,const char * delim)163 xstrsep(char **str, const char *delim)
164 {
165 char *s, *e;
166
167 if (!**str)
168 return (NULL);
169
170 s = *str;
171 e = s + strcspn(s, delim);
172
173 if (*e != '\0')
174 *e++ = '\0';
175 *str = e;
176
177 return (s);
178 }
179
180 /*
181 * Get the next non-null token (like GNU strsep). Strsep() will return a
182 * null token for two adjacent separators, so we may have to loop.
183 */
184 static char *
strnnsep(char ** stringp,char * delim)185 strnnsep(char **stringp, char *delim)
186 {
187 char *tok;
188
189 do {
190 tok = xstrsep(stringp, delim);
191 } while (tok && *tok == '\0');
192 return (tok);
193 }
194
195
196 static int
key_print_wrapper(struct sshkey * hostkey,struct ssh * ssh)197 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
198 {
199 con *c;
200
201 if ((c = ssh_get_app_data(ssh)) != NULL)
202 keyprint(c, hostkey);
203 /* always abort key exchange */
204 return -1;
205 }
206
207 static int
ssh2_capable(int remote_major,int remote_minor)208 ssh2_capable(int remote_major, int remote_minor)
209 {
210 switch (remote_major) {
211 case 1:
212 if (remote_minor == 99)
213 return 1;
214 break;
215 case 2:
216 return 1;
217 default:
218 break;
219 }
220 return 0;
221 }
222
223 static void
keygrab_ssh2(con * c)224 keygrab_ssh2(con *c)
225 {
226 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
227 int r;
228
229 switch (c->c_keytype) {
230 case KT_DSA:
231 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
232 "[email protected]" : "ssh-dss";
233 break;
234 case KT_RSA:
235 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
236 "[email protected]" : "ssh-rsa";
237 break;
238 case KT_ED25519:
239 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
240 "[email protected]" : "ssh-ed25519";
241 break;
242 case KT_XMSS:
243 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
244 "[email protected]" : "[email protected]";
245 break;
246 case KT_ECDSA:
247 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
248 "[email protected],"
249 "[email protected],"
250 "[email protected]" :
251 "ecdsa-sha2-nistp256,"
252 "ecdsa-sha2-nistp384,"
253 "ecdsa-sha2-nistp521";
254 break;
255 default:
256 fatal("unknown key type %d", c->c_keytype);
257 break;
258 }
259 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
260 free(c->c_ssh);
261 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
262 exit(1);
263 }
264 #ifdef WITH_OPENSSL
265 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
266 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
267 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
268 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
269 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
270 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
271 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
272 # ifdef OPENSSL_HAS_ECC
273 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
274 # endif
275 #endif
276 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
277 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
278 /*
279 * do the key-exchange until an error occurs or until
280 * the key_print_wrapper() callback sets c_done.
281 */
282 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
283 }
284
285 static void
keyprint_one(const char * host,struct sshkey * key)286 keyprint_one(const char *host, struct sshkey *key)
287 {
288 char *hostport;
289 const char *known_host, *hashed;
290
291 if (print_sshfp) {
292 export_dns_rr(host, key, stdout, 0);
293 return;
294 }
295
296 hostport = put_host_port(host, ssh_port);
297 lowercase(hostport);
298 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
299 fatal("host_hash failed");
300 known_host = hash_hosts ? hashed : hostport;
301 if (!get_cert)
302 fprintf(stdout, "%s ", known_host);
303 sshkey_write(key, stdout);
304 fputs("\n", stdout);
305 free(hostport);
306 }
307
308 static void
keyprint(con * c,struct sshkey * key)309 keyprint(con *c, struct sshkey *key)
310 {
311 char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
312 char *host, *ohosts;
313
314 if (key == NULL)
315 return;
316 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
317 keyprint_one(hosts, key);
318 return;
319 }
320 ohosts = hosts = xstrdup(hosts);
321 while ((host = strsep(&hosts, ",")) != NULL)
322 keyprint_one(host, key);
323 free(ohosts);
324 }
325
326 static int
tcpconnect(char * host)327 tcpconnect(char *host)
328 {
329 struct addrinfo hints, *ai, *aitop;
330 char strport[NI_MAXSERV];
331 int gaierr, s = -1;
332
333 snprintf(strport, sizeof strport, "%d", ssh_port);
334 memset(&hints, 0, sizeof(hints));
335 hints.ai_family = IPv4or6;
336 hints.ai_socktype = SOCK_STREAM;
337 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
338 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
339 return -1;
340 }
341 for (ai = aitop; ai; ai = ai->ai_next) {
342 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
343 if (s < 0) {
344 error("socket: %s", strerror(errno));
345 continue;
346 }
347 if (set_nonblock(s) == -1)
348 fatal("%s: set_nonblock(%d)", __func__, s);
349 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
350 errno != EINPROGRESS)
351 error("connect (`%s'): %s", host, strerror(errno));
352 else
353 break;
354 close(s);
355 s = -1;
356 }
357 freeaddrinfo(aitop);
358 return s;
359 }
360
361 static int
conalloc(char * iname,char * oname,int keytype)362 conalloc(char *iname, char *oname, int keytype)
363 {
364 char *namebase, *name, *namelist;
365 int s;
366
367 namebase = namelist = xstrdup(iname);
368
369 do {
370 name = xstrsep(&namelist, ",");
371 if (!name) {
372 free(namebase);
373 return (-1);
374 }
375 } while ((s = tcpconnect(name)) < 0);
376
377 if (s >= maxfd)
378 fatal("conalloc: fdno %d too high", s);
379 if (fdcon[s].c_status)
380 fatal("conalloc: attempt to reuse fdno %d", s);
381
382 debug3("%s: oname %s kt %d", __func__, oname, keytype);
383 fdcon[s].c_fd = s;
384 fdcon[s].c_status = CS_CON;
385 fdcon[s].c_namebase = namebase;
386 fdcon[s].c_name = name;
387 fdcon[s].c_namelist = namelist;
388 fdcon[s].c_output_name = xstrdup(oname);
389 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
390 fdcon[s].c_len = 4;
391 fdcon[s].c_off = 0;
392 fdcon[s].c_keytype = keytype;
393 monotime_tv(&fdcon[s].c_tv);
394 fdcon[s].c_tv.tv_sec += timeout;
395 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
396 FD_SET(s, read_wait);
397 ncon++;
398 return (s);
399 }
400
401 static void
confree(int s)402 confree(int s)
403 {
404 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
405 fatal("confree: attempt to free bad fdno %d", s);
406 free(fdcon[s].c_namebase);
407 free(fdcon[s].c_output_name);
408 if (fdcon[s].c_status == CS_KEYS)
409 free(fdcon[s].c_data);
410 fdcon[s].c_status = CS_UNUSED;
411 fdcon[s].c_keytype = 0;
412 if (fdcon[s].c_ssh) {
413 ssh_packet_close(fdcon[s].c_ssh);
414 free(fdcon[s].c_ssh);
415 fdcon[s].c_ssh = NULL;
416 } else
417 close(s);
418 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
419 FD_CLR(s, read_wait);
420 ncon--;
421 }
422
423 static void
contouch(int s)424 contouch(int s)
425 {
426 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
427 monotime_tv(&fdcon[s].c_tv);
428 fdcon[s].c_tv.tv_sec += timeout;
429 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
430 }
431
432 static int
conrecycle(int s)433 conrecycle(int s)
434 {
435 con *c = &fdcon[s];
436 int ret;
437
438 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
439 confree(s);
440 return (ret);
441 }
442
443 static void
congreet(int s)444 congreet(int s)
445 {
446 int n = 0, remote_major = 0, remote_minor = 0;
447 char buf[256], *cp;
448 char remote_version[sizeof buf];
449 size_t bufsiz;
450 con *c = &fdcon[s];
451
452 /* send client banner */
453 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
454 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
455 if (n < 0 || (size_t)n >= sizeof(buf)) {
456 error("snprintf: buffer too small");
457 confree(s);
458 return;
459 }
460 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
461 error("write (%s): %s", c->c_name, strerror(errno));
462 confree(s);
463 return;
464 }
465
466 for (;;) {
467 memset(buf, '\0', sizeof(buf));
468 bufsiz = sizeof(buf);
469 cp = buf;
470 while (bufsiz-- &&
471 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
472 if (*cp == '\r')
473 *cp = '\n';
474 cp++;
475 }
476 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
477 break;
478 }
479 if (n == 0) {
480 switch (errno) {
481 case EPIPE:
482 error("%s: Connection closed by remote host", c->c_name);
483 break;
484 case ECONNREFUSED:
485 break;
486 default:
487 error("read (%s): %s", c->c_name, strerror(errno));
488 break;
489 }
490 conrecycle(s);
491 return;
492 }
493 if (*cp != '\n' && *cp != '\r') {
494 error("%s: bad greeting", c->c_name);
495 confree(s);
496 return;
497 }
498 *cp = '\0';
499 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
500 fatal("ssh_packet_set_connection failed");
501 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
502 ssh_set_app_data(c->c_ssh, c); /* back link */
503 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
504 &remote_major, &remote_minor, remote_version) == 3)
505 c->c_ssh->compat = compat_datafellows(remote_version);
506 else
507 c->c_ssh->compat = 0;
508 if (!ssh2_capable(remote_major, remote_minor)) {
509 debug("%s doesn't support ssh2", c->c_name);
510 confree(s);
511 return;
512 }
513 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
514 c->c_name, ssh_port, chop(buf));
515 keygrab_ssh2(c);
516 confree(s);
517 }
518
519 static void
conread(int s)520 conread(int s)
521 {
522 con *c = &fdcon[s];
523 size_t n;
524
525 if (c->c_status == CS_CON) {
526 congreet(s);
527 return;
528 }
529 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
530 if (n == 0) {
531 error("read (%s): %s", c->c_name, strerror(errno));
532 confree(s);
533 return;
534 }
535 c->c_off += n;
536
537 if (c->c_off == c->c_len)
538 switch (c->c_status) {
539 case CS_SIZE:
540 c->c_plen = htonl(c->c_plen);
541 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
542 c->c_off = 0;
543 c->c_data = xmalloc(c->c_len);
544 c->c_status = CS_KEYS;
545 break;
546 default:
547 fatal("conread: invalid status %d", c->c_status);
548 break;
549 }
550
551 contouch(s);
552 }
553
554 static void
conloop(void)555 conloop(void)
556 {
557 struct timeval seltime, now;
558 fd_set *r, *e;
559 con *c;
560 int i;
561
562 monotime_tv(&now);
563 c = TAILQ_FIRST(&tq);
564
565 if (c && (c->c_tv.tv_sec > now.tv_sec ||
566 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
567 seltime = c->c_tv;
568 seltime.tv_sec -= now.tv_sec;
569 seltime.tv_usec -= now.tv_usec;
570 if (seltime.tv_usec < 0) {
571 seltime.tv_usec += 1000000;
572 seltime.tv_sec--;
573 }
574 } else
575 timerclear(&seltime);
576
577 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
578 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
579 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
580 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
581
582 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
583 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
584 ;
585
586 for (i = 0; i < maxfd; i++) {
587 if (FD_ISSET(i, e)) {
588 error("%s: exception!", fdcon[i].c_name);
589 confree(i);
590 } else if (FD_ISSET(i, r))
591 conread(i);
592 }
593 free(r);
594 free(e);
595
596 c = TAILQ_FIRST(&tq);
597 while (c && (c->c_tv.tv_sec < now.tv_sec ||
598 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
599 int s = c->c_fd;
600
601 c = TAILQ_NEXT(c, c_link);
602 conrecycle(s);
603 }
604 }
605
606 static void
do_host(char * host)607 do_host(char *host)
608 {
609 char *name = strnnsep(&host, " \t\n");
610 int j;
611
612 if (name == NULL)
613 return;
614 for (j = KT_MIN; j <= KT_MAX; j *= 2) {
615 if (get_keytypes & j) {
616 while (ncon >= MAXCON)
617 conloop();
618 conalloc(name, *host ? host : name, j);
619 }
620 }
621 }
622
623 void
fatal(const char * fmt,...)624 fatal(const char *fmt,...)
625 {
626 va_list args;
627
628 va_start(args, fmt);
629 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
630 va_end(args);
631 exit(255);
632 }
633
634 static void
usage(void)635 usage(void)
636 {
637 fprintf(stderr,
638 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
639 "\t\t [host | addrlist namelist]\n",
640 __progname);
641 exit(1);
642 }
643
644 int
main(int argc,char ** argv)645 main(int argc, char **argv)
646 {
647 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
648 int opt, fopt_count = 0, j;
649 char *tname, *cp, *line = NULL;
650 size_t linesize = 0;
651 FILE *fp;
652
653 extern int optind;
654 extern char *optarg;
655
656 ssh_malloc_init(); /* must be called before any mallocs */
657 __progname = ssh_get_progname(argv[0]);
658 seed_rng();
659 TAILQ_INIT(&tq);
660
661 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
662 sanitise_stdfd();
663
664 if (argc <= 1)
665 usage();
666
667 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
668 switch (opt) {
669 case 'H':
670 hash_hosts = 1;
671 break;
672 case 'c':
673 get_cert = 1;
674 break;
675 case 'D':
676 print_sshfp = 1;
677 break;
678 case 'p':
679 ssh_port = a2port(optarg);
680 if (ssh_port <= 0) {
681 fprintf(stderr, "Bad port '%s'\n", optarg);
682 exit(1);
683 }
684 break;
685 case 'T':
686 timeout = convtime(optarg);
687 if (timeout == -1 || timeout == 0) {
688 fprintf(stderr, "Bad timeout '%s'\n", optarg);
689 usage();
690 }
691 break;
692 case 'v':
693 if (!debug_flag) {
694 debug_flag = 1;
695 log_level = SYSLOG_LEVEL_DEBUG1;
696 }
697 else if (log_level < SYSLOG_LEVEL_DEBUG3)
698 log_level++;
699 else
700 fatal("Too high debugging level.");
701 break;
702 case 'f':
703 if (strcmp(optarg, "-") == 0)
704 optarg = NULL;
705 argv[fopt_count++] = optarg;
706 break;
707 case 't':
708 get_keytypes = 0;
709 tname = strtok(optarg, ",");
710 while (tname) {
711 int type = sshkey_type_from_name(tname);
712
713 switch (type) {
714 case KEY_DSA:
715 get_keytypes |= KT_DSA;
716 break;
717 case KEY_ECDSA:
718 get_keytypes |= KT_ECDSA;
719 break;
720 case KEY_RSA:
721 get_keytypes |= KT_RSA;
722 break;
723 case KEY_ED25519:
724 get_keytypes |= KT_ED25519;
725 break;
726 case KEY_XMSS:
727 get_keytypes |= KT_XMSS;
728 break;
729 case KEY_UNSPEC:
730 default:
731 fatal("Unknown key type \"%s\"", tname);
732 }
733 tname = strtok(NULL, ",");
734 }
735 break;
736 case '4':
737 IPv4or6 = AF_INET;
738 break;
739 case '6':
740 IPv4or6 = AF_INET6;
741 break;
742 case '?':
743 default:
744 usage();
745 }
746 }
747 if (optind == argc && !fopt_count)
748 usage();
749
750 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
751
752 maxfd = fdlim_get(1);
753 if (maxfd < 0)
754 fatal("%s: fdlim_get: bad value", __progname);
755 if (maxfd > MAXMAXFD)
756 maxfd = MAXMAXFD;
757 if (MAXCON <= 0)
758 fatal("%s: not enough file descriptors", __progname);
759 if (maxfd > fdlim_get(0))
760 fdlim_set(maxfd);
761 fdcon = xcalloc(maxfd, sizeof(con));
762
763 read_wait_nfdset = howmany(maxfd, NFDBITS);
764 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
765
766 for (j = 0; j < fopt_count; j++) {
767 if (argv[j] == NULL)
768 fp = stdin;
769 else if ((fp = fopen(argv[j], "r")) == NULL)
770 fatal("%s: %s: %s", __progname, argv[j],
771 strerror(errno));
772
773 while (getline(&line, &linesize, fp) != -1) {
774 /* Chomp off trailing whitespace and comments */
775 if ((cp = strchr(line, '#')) == NULL)
776 cp = line + strlen(line) - 1;
777 while (cp >= line) {
778 if (*cp == ' ' || *cp == '\t' ||
779 *cp == '\n' || *cp == '#')
780 *cp-- = '\0';
781 else
782 break;
783 }
784
785 /* Skip empty lines */
786 if (*line == '\0')
787 continue;
788
789 do_host(line);
790 }
791
792 if (ferror(fp))
793 fatal("%s: %s: %s", __progname, argv[j],
794 strerror(errno));
795
796 fclose(fp);
797 }
798 free(line);
799
800 while (optind < argc)
801 do_host(argv[optind++]);
802
803 while (ncon > 0)
804 conloop();
805
806 return (0);
807 }
808