1 /* $OpenBSD: ssh-keyscan.c,v 1.101 2015/04/10 00:08:55 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 "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 "ssh1.h"
36 #include "sshbuf.h"
37 #include "sshkey.h"
38 #include "cipher.h"
39 #include "kex.h"
40 #include "compat.h"
41 #include "myproposal.h"
42 #include "packet.h"
43 #include "dispatch.h"
44 #include "log.h"
45 #include "atomicio.h"
46 #include "misc.h"
47 #include "hostfile.h"
48 #include "ssherr.h"
49 #include "ssh_api.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_RSA1 1
58 #define KT_DSA 2
59 #define KT_RSA 4
60 #define KT_ECDSA 8
61 #define KT_ED25519 16
62
63 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
64
65 int hash_hosts = 0; /* Hash hostname on output */
66
67 #define MAXMAXFD 256
68
69 /* The number of seconds after which to give up on a TCP connection */
70 int timeout = 5;
71
72 int maxfd;
73 #define MAXCON (maxfd - 10)
74
75 extern char *__progname;
76 fd_set *read_wait;
77 size_t read_wait_nfdset;
78 int ncon;
79
80 struct ssh *active_state = NULL; /* XXX needed for linking */
81
82 /*
83 * Keep a connection structure for each file descriptor. The state
84 * associated with file descriptor n is held in fdcon[n].
85 */
86 typedef struct Connection {
87 u_char c_status; /* State of connection on this file desc. */
88 #define CS_UNUSED 0 /* File descriptor unused */
89 #define CS_CON 1 /* Waiting to connect/read greeting */
90 #define CS_SIZE 2 /* Waiting to read initial packet size */
91 #define CS_KEYS 3 /* Waiting to read public key packet */
92 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
93 int c_plen; /* Packet length field for ssh packet */
94 int c_len; /* Total bytes which must be read. */
95 int c_off; /* Length of data read so far. */
96 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
97 sig_atomic_t c_done; /* SSH2 done */
98 char *c_namebase; /* Address to free for c_name and c_namelist */
99 char *c_name; /* Hostname of connection for errors */
100 char *c_namelist; /* Pointer to other possible addresses */
101 char *c_output_name; /* Hostname of connection for output */
102 char *c_data; /* Data read from this fd */
103 struct ssh *c_ssh; /* SSH-connection */
104 struct timeval c_tv; /* Time at which connection gets aborted */
105 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
106 } con;
107
108 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
109 con *fdcon;
110
111 static void keyprint(con *c, struct sshkey *key);
112
113 static int
fdlim_get(int hard)114 fdlim_get(int hard)
115 {
116 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
117 struct rlimit rlfd;
118
119 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
120 return (-1);
121 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
122 return SSH_SYSFDMAX;
123 else
124 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
125 #else
126 return SSH_SYSFDMAX;
127 #endif
128 }
129
130 static int
fdlim_set(int lim)131 fdlim_set(int lim)
132 {
133 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
134 struct rlimit rlfd;
135 #endif
136
137 if (lim <= 0)
138 return (-1);
139 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
140 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
141 return (-1);
142 rlfd.rlim_cur = lim;
143 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
144 return (-1);
145 #elif defined (HAVE_SETDTABLESIZE)
146 setdtablesize(lim);
147 #endif
148 return (0);
149 }
150
151 /*
152 * This is an strsep function that returns a null field for adjacent
153 * separators. This is the same as the 4.4BSD strsep, but different from the
154 * one in the GNU libc.
155 */
156 static char *
xstrsep(char ** str,const char * delim)157 xstrsep(char **str, const char *delim)
158 {
159 char *s, *e;
160
161 if (!**str)
162 return (NULL);
163
164 s = *str;
165 e = s + strcspn(s, delim);
166
167 if (*e != '\0')
168 *e++ = '\0';
169 *str = e;
170
171 return (s);
172 }
173
174 /*
175 * Get the next non-null token (like GNU strsep). Strsep() will return a
176 * null token for two adjacent separators, so we may have to loop.
177 */
178 static char *
strnnsep(char ** stringp,char * delim)179 strnnsep(char **stringp, char *delim)
180 {
181 char *tok;
182
183 do {
184 tok = xstrsep(stringp, delim);
185 } while (tok && *tok == '\0');
186 return (tok);
187 }
188
189 #ifdef WITH_SSH1
190 static struct sshkey *
keygrab_ssh1(con * c)191 keygrab_ssh1(con *c)
192 {
193 static struct sshkey *rsa;
194 static struct sshbuf *msg;
195 int r;
196 u_char type;
197
198 if (rsa == NULL) {
199 if ((rsa = sshkey_new(KEY_RSA1)) == NULL) {
200 error("%s: sshkey_new failed", __func__);
201 return NULL;
202 }
203 if ((msg = sshbuf_new()) == NULL)
204 fatal("%s: sshbuf_new failed", __func__);
205 }
206 if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 ||
207 (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */
208 (r = sshbuf_get_u8(msg, &type)) != 0)
209 goto buf_err;
210 if (type != (int) SSH_SMSG_PUBLIC_KEY) {
211 error("%s: invalid packet type", c->c_name);
212 sshbuf_reset(msg);
213 return NULL;
214 }
215 if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */
216 /* server key */
217 (r = sshbuf_get_u32(msg, NULL)) != 0 ||
218 (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
219 (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
220 /* host key */
221 (r = sshbuf_get_u32(msg, NULL)) != 0 ||
222 (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 ||
223 (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) {
224 buf_err:
225 error("%s: buffer error: %s", __func__, ssh_err(r));
226 sshbuf_reset(msg);
227 return NULL;
228 }
229
230 sshbuf_reset(msg);
231
232 return (rsa);
233 }
234 #endif
235
236 static int
key_print_wrapper(struct sshkey * hostkey,struct ssh * ssh)237 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
238 {
239 con *c;
240
241 if ((c = ssh_get_app_data(ssh)) != NULL)
242 keyprint(c, hostkey);
243 /* always abort key exchange */
244 return -1;
245 }
246
247 static int
ssh2_capable(int remote_major,int remote_minor)248 ssh2_capable(int remote_major, int remote_minor)
249 {
250 switch (remote_major) {
251 case 1:
252 if (remote_minor == 99)
253 return 1;
254 break;
255 case 2:
256 return 1;
257 default:
258 break;
259 }
260 return 0;
261 }
262
263 static void
keygrab_ssh2(con * c)264 keygrab_ssh2(con *c)
265 {
266 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
267 int r;
268
269 enable_compat20();
270 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
271 c->c_keytype == KT_DSA ? "ssh-dss" :
272 (c->c_keytype == KT_RSA ? "ssh-rsa" :
273 (c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
274 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
275 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
276 free(c->c_ssh);
277 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
278 exit(1);
279 }
280 #ifdef WITH_OPENSSL
281 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
282 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
283 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
284 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
285 # ifdef OPENSSL_HAS_ECC
286 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
287 # endif
288 #endif
289 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
290 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
291 /*
292 * do the key-exchange until an error occurs or until
293 * the key_print_wrapper() callback sets c_done.
294 */
295 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh);
296 }
297
298 static void
keyprint(con * c,struct sshkey * key)299 keyprint(con *c, struct sshkey *key)
300 {
301 char *host = c->c_output_name ? c->c_output_name : c->c_name;
302 char *hostport = NULL;
303
304 if (!key)
305 return;
306 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
307 fatal("host_hash failed");
308
309 hostport = put_host_port(host, ssh_port);
310 fprintf(stdout, "%s ", hostport);
311 sshkey_write(key, stdout);
312 fputs("\n", stdout);
313 free(hostport);
314 }
315
316 static int
tcpconnect(char * host)317 tcpconnect(char *host)
318 {
319 struct addrinfo hints, *ai, *aitop;
320 char strport[NI_MAXSERV];
321 int gaierr, s = -1;
322
323 snprintf(strport, sizeof strport, "%d", ssh_port);
324 memset(&hints, 0, sizeof(hints));
325 hints.ai_family = IPv4or6;
326 hints.ai_socktype = SOCK_STREAM;
327 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
328 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
329 return -1;
330 }
331 for (ai = aitop; ai; ai = ai->ai_next) {
332 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
333 if (s < 0) {
334 error("socket: %s", strerror(errno));
335 continue;
336 }
337 if (set_nonblock(s) == -1)
338 fatal("%s: set_nonblock(%d)", __func__, s);
339 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
340 errno != EINPROGRESS)
341 error("connect (`%s'): %s", host, strerror(errno));
342 else
343 break;
344 close(s);
345 s = -1;
346 }
347 freeaddrinfo(aitop);
348 return s;
349 }
350
351 static int
conalloc(char * iname,char * oname,int keytype)352 conalloc(char *iname, char *oname, int keytype)
353 {
354 char *namebase, *name, *namelist;
355 int s;
356
357 namebase = namelist = xstrdup(iname);
358
359 do {
360 name = xstrsep(&namelist, ",");
361 if (!name) {
362 free(namebase);
363 return (-1);
364 }
365 } while ((s = tcpconnect(name)) < 0);
366
367 if (s >= maxfd)
368 fatal("conalloc: fdno %d too high", s);
369 if (fdcon[s].c_status)
370 fatal("conalloc: attempt to reuse fdno %d", s);
371
372 fdcon[s].c_fd = s;
373 fdcon[s].c_status = CS_CON;
374 fdcon[s].c_namebase = namebase;
375 fdcon[s].c_name = name;
376 fdcon[s].c_namelist = namelist;
377 fdcon[s].c_output_name = xstrdup(oname);
378 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
379 fdcon[s].c_len = 4;
380 fdcon[s].c_off = 0;
381 fdcon[s].c_keytype = keytype;
382 gettimeofday(&fdcon[s].c_tv, NULL);
383 fdcon[s].c_tv.tv_sec += timeout;
384 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
385 FD_SET(s, read_wait);
386 ncon++;
387 return (s);
388 }
389
390 static void
confree(int s)391 confree(int s)
392 {
393 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
394 fatal("confree: attempt to free bad fdno %d", s);
395 close(s);
396 free(fdcon[s].c_namebase);
397 free(fdcon[s].c_output_name);
398 if (fdcon[s].c_status == CS_KEYS)
399 free(fdcon[s].c_data);
400 fdcon[s].c_status = CS_UNUSED;
401 fdcon[s].c_keytype = 0;
402 if (fdcon[s].c_ssh) {
403 ssh_packet_close(fdcon[s].c_ssh);
404 free(fdcon[s].c_ssh);
405 fdcon[s].c_ssh = NULL;
406 }
407 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
408 FD_CLR(s, read_wait);
409 ncon--;
410 }
411
412 static void
contouch(int s)413 contouch(int s)
414 {
415 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
416 gettimeofday(&fdcon[s].c_tv, NULL);
417 fdcon[s].c_tv.tv_sec += timeout;
418 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
419 }
420
421 static int
conrecycle(int s)422 conrecycle(int s)
423 {
424 con *c = &fdcon[s];
425 int ret;
426
427 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
428 confree(s);
429 return (ret);
430 }
431
432 static void
congreet(int s)433 congreet(int s)
434 {
435 int n = 0, remote_major = 0, remote_minor = 0;
436 char buf[256], *cp;
437 char remote_version[sizeof buf];
438 size_t bufsiz;
439 con *c = &fdcon[s];
440
441 for (;;) {
442 memset(buf, '\0', sizeof(buf));
443 bufsiz = sizeof(buf);
444 cp = buf;
445 while (bufsiz-- &&
446 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
447 if (*cp == '\r')
448 *cp = '\n';
449 cp++;
450 }
451 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
452 break;
453 }
454 if (n == 0) {
455 switch (errno) {
456 case EPIPE:
457 error("%s: Connection closed by remote host", c->c_name);
458 break;
459 case ECONNREFUSED:
460 break;
461 default:
462 error("read (%s): %s", c->c_name, strerror(errno));
463 break;
464 }
465 conrecycle(s);
466 return;
467 }
468 if (*cp != '\n' && *cp != '\r') {
469 error("%s: bad greeting", c->c_name);
470 confree(s);
471 return;
472 }
473 *cp = '\0';
474 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
475 fatal("ssh_packet_set_connection failed");
476 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
477 ssh_set_app_data(c->c_ssh, c); /* back link */
478 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
479 &remote_major, &remote_minor, remote_version) == 3)
480 c->c_ssh->compat = compat_datafellows(remote_version);
481 else
482 c->c_ssh->compat = 0;
483 if (c->c_keytype != KT_RSA1) {
484 if (!ssh2_capable(remote_major, remote_minor)) {
485 debug("%s doesn't support ssh2", c->c_name);
486 confree(s);
487 return;
488 }
489 } else if (remote_major != 1) {
490 debug("%s doesn't support ssh1", c->c_name);
491 confree(s);
492 return;
493 }
494 fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf));
495 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
496 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
497 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
498 if (n < 0 || (size_t)n >= sizeof(buf)) {
499 error("snprintf: buffer too small");
500 confree(s);
501 return;
502 }
503 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
504 error("write (%s): %s", c->c_name, strerror(errno));
505 confree(s);
506 return;
507 }
508 if (c->c_keytype != KT_RSA1) {
509 keygrab_ssh2(c);
510 confree(s);
511 return;
512 }
513 c->c_status = CS_SIZE;
514 contouch(s);
515 }
516
517 static void
conread(int s)518 conread(int s)
519 {
520 con *c = &fdcon[s];
521 size_t n;
522
523 if (c->c_status == CS_CON) {
524 congreet(s);
525 return;
526 }
527 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
528 if (n == 0) {
529 error("read (%s): %s", c->c_name, strerror(errno));
530 confree(s);
531 return;
532 }
533 c->c_off += n;
534
535 if (c->c_off == c->c_len)
536 switch (c->c_status) {
537 case CS_SIZE:
538 c->c_plen = htonl(c->c_plen);
539 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
540 c->c_off = 0;
541 c->c_data = xmalloc(c->c_len);
542 c->c_status = CS_KEYS;
543 break;
544 #ifdef WITH_SSH1
545 case CS_KEYS:
546 keyprint(c, keygrab_ssh1(c));
547 confree(s);
548 return;
549 #endif
550 default:
551 fatal("conread: invalid status %d", c->c_status);
552 break;
553 }
554
555 contouch(s);
556 }
557
558 static void
conloop(void)559 conloop(void)
560 {
561 struct timeval seltime, now;
562 fd_set *r, *e;
563 con *c;
564 int i;
565
566 gettimeofday(&now, NULL);
567 c = TAILQ_FIRST(&tq);
568
569 if (c && (c->c_tv.tv_sec > now.tv_sec ||
570 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
571 seltime = c->c_tv;
572 seltime.tv_sec -= now.tv_sec;
573 seltime.tv_usec -= now.tv_usec;
574 if (seltime.tv_usec < 0) {
575 seltime.tv_usec += 1000000;
576 seltime.tv_sec--;
577 }
578 } else
579 timerclear(&seltime);
580
581 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
582 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
583 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
584 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
585
586 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
587 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
588 ;
589
590 for (i = 0; i < maxfd; i++) {
591 if (FD_ISSET(i, e)) {
592 error("%s: exception!", fdcon[i].c_name);
593 confree(i);
594 } else if (FD_ISSET(i, r))
595 conread(i);
596 }
597 free(r);
598 free(e);
599
600 c = TAILQ_FIRST(&tq);
601 while (c && (c->c_tv.tv_sec < now.tv_sec ||
602 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
603 int s = c->c_fd;
604
605 c = TAILQ_NEXT(c, c_link);
606 conrecycle(s);
607 }
608 }
609
610 static void
do_host(char * host)611 do_host(char *host)
612 {
613 char *name = strnnsep(&host, " \t\n");
614 int j;
615
616 if (name == NULL)
617 return;
618 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
619 if (get_keytypes & j) {
620 while (ncon >= MAXCON)
621 conloop();
622 conalloc(name, *host ? host : name, j);
623 }
624 }
625 }
626
627 void
fatal(const char * fmt,...)628 fatal(const char *fmt,...)
629 {
630 va_list args;
631
632 va_start(args, fmt);
633 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
634 va_end(args);
635 exit(255);
636 }
637
638 static void
usage(void)639 usage(void)
640 {
641 fprintf(stderr,
642 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
643 "\t\t [host | addrlist namelist] ...\n",
644 __progname);
645 exit(1);
646 }
647
648 int
main(int argc,char ** argv)649 main(int argc, char **argv)
650 {
651 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
652 int opt, fopt_count = 0, j;
653 char *tname, *cp, line[NI_MAXHOST];
654 FILE *fp;
655 u_long linenum;
656
657 extern int optind;
658 extern char *optarg;
659
660 __progname = ssh_get_progname(argv[0]);
661 seed_rng();
662 TAILQ_INIT(&tq);
663
664 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
665 sanitise_stdfd();
666
667 if (argc <= 1)
668 usage();
669
670 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
671 switch (opt) {
672 case 'H':
673 hash_hosts = 1;
674 break;
675 case 'p':
676 ssh_port = a2port(optarg);
677 if (ssh_port <= 0) {
678 fprintf(stderr, "Bad port '%s'\n", optarg);
679 exit(1);
680 }
681 break;
682 case 'T':
683 timeout = convtime(optarg);
684 if (timeout == -1 || timeout == 0) {
685 fprintf(stderr, "Bad timeout '%s'\n", optarg);
686 usage();
687 }
688 break;
689 case 'v':
690 if (!debug_flag) {
691 debug_flag = 1;
692 log_level = SYSLOG_LEVEL_DEBUG1;
693 }
694 else if (log_level < SYSLOG_LEVEL_DEBUG3)
695 log_level++;
696 else
697 fatal("Too high debugging level.");
698 break;
699 case 'f':
700 if (strcmp(optarg, "-") == 0)
701 optarg = NULL;
702 argv[fopt_count++] = optarg;
703 break;
704 case 't':
705 get_keytypes = 0;
706 tname = strtok(optarg, ",");
707 while (tname) {
708 int type = sshkey_type_from_name(tname);
709 switch (type) {
710 case KEY_RSA1:
711 get_keytypes |= KT_RSA1;
712 break;
713 case KEY_DSA:
714 get_keytypes |= KT_DSA;
715 break;
716 case KEY_ECDSA:
717 get_keytypes |= KT_ECDSA;
718 break;
719 case KEY_RSA:
720 get_keytypes |= KT_RSA;
721 break;
722 case KEY_ED25519:
723 get_keytypes |= KT_ED25519;
724 break;
725 case KEY_UNSPEC:
726 fatal("unknown key type %s", tname);
727 }
728 tname = strtok(NULL, ",");
729 }
730 break;
731 case '4':
732 IPv4or6 = AF_INET;
733 break;
734 case '6':
735 IPv4or6 = AF_INET6;
736 break;
737 case '?':
738 default:
739 usage();
740 }
741 }
742 if (optind == argc && !fopt_count)
743 usage();
744
745 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
746
747 maxfd = fdlim_get(1);
748 if (maxfd < 0)
749 fatal("%s: fdlim_get: bad value", __progname);
750 if (maxfd > MAXMAXFD)
751 maxfd = MAXMAXFD;
752 if (MAXCON <= 0)
753 fatal("%s: not enough file descriptors", __progname);
754 if (maxfd > fdlim_get(0))
755 fdlim_set(maxfd);
756 fdcon = xcalloc(maxfd, sizeof(con));
757
758 read_wait_nfdset = howmany(maxfd, NFDBITS);
759 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
760
761 for (j = 0; j < fopt_count; j++) {
762 if (argv[j] == NULL)
763 fp = stdin;
764 else if ((fp = fopen(argv[j], "r")) == NULL)
765 fatal("%s: %s: %s", __progname, argv[j],
766 strerror(errno));
767 linenum = 0;
768
769 while (read_keyfile_line(fp,
770 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
771 &linenum) != -1) {
772 /* Chomp off trailing whitespace and comments */
773 if ((cp = strchr(line, '#')) == NULL)
774 cp = line + strlen(line) - 1;
775 while (cp >= line) {
776 if (*cp == ' ' || *cp == '\t' ||
777 *cp == '\n' || *cp == '#')
778 *cp-- = '\0';
779 else
780 break;
781 }
782
783 /* Skip empty lines */
784 if (*line == '\0')
785 continue;
786
787 do_host(line);
788 }
789
790 if (ferror(fp))
791 fatal("%s: %s: %s", __progname, argv[j],
792 strerror(errno));
793
794 fclose(fp);
795 }
796
797 while (optind < argc)
798 do_host(argv[optind++]);
799
800 while (ncon > 0)
801 conloop();
802
803 return (0);
804 }
805