1 /* $OpenBSD: ssh-keyscan.c,v 1.78 2009/01/22 10:02:34 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 <sys/types.h>
11 #include <sys/time.h>
12 #include <sys/socket.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15 #include <sys/resource.h>
16
17 #include <openssl/bn.h>
18
19 #include <errno.h>
20 #include <netdb.h>
21 #include <setjmp.h>
22 #include <stdarg.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <signal.h>
26 #include <string.h>
27 #include <unistd.h>
28
29 #include "xmalloc.h"
30 #include "ssh.h"
31 #include "ssh1.h"
32 #include "buffer.h"
33 #include "key.h"
34 #include "cipher.h"
35 #include "kex.h"
36 #include "compat.h"
37 #include "myproposal.h"
38 #include "packet.h"
39 #include "dispatch.h"
40 #include "log.h"
41 #include "atomicio.h"
42 #include "misc.h"
43 #include "hostfile.h"
44
45 __RCSID("$MirOS: src/usr.bin/ssh/ssh-keyscan.c,v 1.9 2009/03/22 15:01:21 tg Exp $");
46
47 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
48 Default value is AF_UNSPEC means both IPv4 and IPv6. */
49 int IPv4or6 = AF_UNSPEC;
50
51 int ssh_port = SSH_DEFAULT_PORT;
52
53 #define KT_RSA1 1
54 #define KT_DSA 2
55 #define KT_RSA 4
56
57 int get_keytypes = KT_RSA; /* Get only RSA keys by default */
58
59 int hash_hosts = 0; /* Hash hostname on output */
60
61 #define MAXMAXFD 256
62
63 /* The number of seconds after which to give up on a TCP connection */
64 int timeout = 5;
65
66 int maxfd;
67 #define MAXCON (maxfd - 10)
68
69 extern char *__progname;
70 fd_set *read_wait;
71 size_t read_wait_nfdset;
72 int ncon;
73 int nonfatal_fatal = 0;
74 jmp_buf kexjmp;
75 Key *kexjmp_key;
76
77 /*
78 * Keep a connection structure for each file descriptor. The state
79 * associated with file descriptor n is held in fdcon[n].
80 */
81 typedef struct Connection {
82 u_char c_status; /* State of connection on this file desc. */
83 #define CS_UNUSED 0 /* File descriptor unused */
84 #define CS_CON 1 /* Waiting to connect/read greeting */
85 #define CS_SIZE 2 /* Waiting to read initial packet size */
86 #define CS_KEYS 3 /* Waiting to read public key packet */
87 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
88 int c_plen; /* Packet length field for ssh packet */
89 int c_len; /* Total bytes which must be read. */
90 int c_off; /* Length of data read so far. */
91 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
92 char *c_namebase; /* Address to free for c_name and c_namelist */
93 char *c_name; /* Hostname of connection for errors */
94 char *c_namelist; /* Pointer to other possible addresses */
95 char *c_output_name; /* Hostname of connection for output */
96 char *c_data; /* Data read from this fd */
97 Kex *c_kex; /* The key-exchange struct for ssh2 */
98 struct timeval c_tv; /* Time at which connection gets aborted */
99 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
100 } con;
101
102 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
103 con *fdcon;
104
105 /*
106 * This is just a wrapper around fgets() to make it usable.
107 */
108
109 /* Stress-test. Increase this later. */
110 #define LINEBUF_SIZE 16
111
112 typedef struct {
113 char *buf;
114 u_int size;
115 int lineno;
116 const char *filename;
117 FILE *stream;
118 void (*errfun) (const char *,...);
119 } Linebuf;
120
121 static Linebuf *
Linebuf_alloc(const char * filename,void (* errfun)(const char *,...))122 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
123 {
124 Linebuf *lb;
125
126 if (!(lb = malloc(sizeof(*lb)))) {
127 if (errfun)
128 (*errfun) ("linebuf (%s): malloc failed\n",
129 filename ? filename : "(stdin)");
130 return (NULL);
131 }
132 if (filename) {
133 lb->filename = filename;
134 if (!(lb->stream = fopen(filename, "r"))) {
135 xfree(lb);
136 if (errfun)
137 (*errfun) ("%s: %s\n", filename, strerror(errno));
138 return (NULL);
139 }
140 } else {
141 lb->filename = "(stdin)";
142 lb->stream = stdin;
143 }
144
145 if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) {
146 if (errfun)
147 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
148 xfree(lb);
149 return (NULL);
150 }
151 lb->errfun = errfun;
152 lb->lineno = 0;
153 return (lb);
154 }
155
156 static void
Linebuf_free(Linebuf * lb)157 Linebuf_free(Linebuf * lb)
158 {
159 fclose(lb->stream);
160 xfree(lb->buf);
161 xfree(lb);
162 }
163
164 #if 0
165 static void
166 Linebuf_restart(Linebuf * lb)
167 {
168 clearerr(lb->stream);
169 rewind(lb->stream);
170 lb->lineno = 0;
171 }
172
173 static int
174 Linebuf_lineno(Linebuf * lb)
175 {
176 return (lb->lineno);
177 }
178 #endif
179
180 static char *
Linebuf_getline(Linebuf * lb)181 Linebuf_getline(Linebuf * lb)
182 {
183 size_t n = 0;
184 void *p;
185
186 lb->lineno++;
187 for (;;) {
188 /* Read a line */
189 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
190 if (ferror(lb->stream) && lb->errfun)
191 (*lb->errfun)("%s: %s\n", lb->filename,
192 strerror(errno));
193 return (NULL);
194 }
195 n = strlen(lb->buf);
196
197 /* Return it or an error if it fits */
198 if (n > 0 && lb->buf[n - 1] == '\n') {
199 lb->buf[n - 1] = '\0';
200 return (lb->buf);
201 }
202 if (n != lb->size - 1) {
203 if (lb->errfun)
204 (*lb->errfun)("%s: skipping incomplete last line\n",
205 lb->filename);
206 return (NULL);
207 }
208 /* Double the buffer if we need more space */
209 lb->size *= 2;
210 if ((p = realloc(lb->buf, lb->size)) == NULL) {
211 lb->size /= 2;
212 if (lb->errfun)
213 (*lb->errfun)("linebuf (%s): realloc failed\n",
214 lb->filename);
215 return (NULL);
216 }
217 lb->buf = p;
218 }
219 }
220
221 static int
fdlim_get(int hard)222 fdlim_get(int hard)
223 {
224 struct rlimit rlfd;
225
226 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
227 return (-1);
228 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
229 return sysconf(_SC_OPEN_MAX);
230 else
231 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
232 }
233
234 static int
fdlim_set(int lim)235 fdlim_set(int lim)
236 {
237 struct rlimit rlfd;
238
239 if (lim <= 0)
240 return (-1);
241 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
242 return (-1);
243 rlfd.rlim_cur = lim;
244 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
245 return (-1);
246 return (0);
247 }
248
249 /*
250 * This is an strsep function that returns a null field for adjacent
251 * separators. This is the same as the 4.4BSD strsep, but different from the
252 * one in the GNU libc.
253 */
254 static char *
xstrsep(char ** str,const char * delim)255 xstrsep(char **str, const char *delim)
256 {
257 char *s, *e;
258
259 if (!**str)
260 return (NULL);
261
262 s = *str;
263 e = s + strcspn(s, delim);
264
265 if (*e != '\0')
266 *e++ = '\0';
267 *str = e;
268
269 return (s);
270 }
271
272 /*
273 * Get the next non-null token (like GNU strsep). Strsep() will return a
274 * null token for two adjacent separators, so we may have to loop.
275 */
276 static char *
strnnsep(char ** stringp,char * delim)277 strnnsep(char **stringp, char *delim)
278 {
279 char *tok;
280
281 do {
282 tok = xstrsep(stringp, delim);
283 } while (tok && *tok == '\0');
284 return (tok);
285 }
286
287 static Key *
keygrab_ssh1(con * c)288 keygrab_ssh1(con *c)
289 {
290 static Key *rsa;
291 static Buffer msg;
292
293 if (rsa == NULL) {
294 buffer_init(&msg);
295 rsa = key_new(KEY_RSA1);
296 }
297 buffer_append(&msg, c->c_data, c->c_plen);
298 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
299 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
300 error("%s: invalid packet type", c->c_name);
301 buffer_clear(&msg);
302 return NULL;
303 }
304 buffer_consume(&msg, 8); /* cookie */
305
306 /* server key */
307 (void) buffer_get_int(&msg);
308 buffer_get_bignum(&msg, rsa->rsa->e);
309 buffer_get_bignum(&msg, rsa->rsa->n);
310
311 /* host key */
312 (void) buffer_get_int(&msg);
313 buffer_get_bignum(&msg, rsa->rsa->e);
314 buffer_get_bignum(&msg, rsa->rsa->n);
315
316 buffer_clear(&msg);
317
318 return (rsa);
319 }
320
321 static __dead int
hostjump(Key * hostkey)322 hostjump(Key *hostkey)
323 {
324 kexjmp_key = hostkey;
325 longjmp(kexjmp, 1);
326 }
327
328 static int
ssh2_capable(int remote_major,int remote_minor)329 ssh2_capable(int remote_major, int remote_minor)
330 {
331 switch (remote_major) {
332 case 1:
333 if (remote_minor == 99)
334 return 1;
335 break;
336 case 2:
337 return 1;
338 default:
339 break;
340 }
341 return 0;
342 }
343
344 static Key *
keygrab_ssh2(con * c)345 keygrab_ssh2(con *c)
346 {
347 int j;
348
349 packet_set_connection(c->c_fd, c->c_fd);
350 enable_compat20();
351 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
352 "ssh-dss": "ssh-rsa";
353 c->c_kex = kex_setup(myproposal);
354 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
355 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
356 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
357 c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
358 c->c_kex->verify_host_key = hostjump;
359
360 if (!(j = setjmp(kexjmp))) {
361 nonfatal_fatal = 1;
362 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
363 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
364 exit(1);
365 }
366 nonfatal_fatal = 0;
367 xfree(c->c_kex);
368 c->c_kex = NULL;
369 packet_close();
370
371 return j < 0? NULL : kexjmp_key;
372 }
373
374 static void
keyprint(con * c,Key * key)375 keyprint(con *c, Key *key)
376 {
377 char *host = c->c_output_name ? c->c_output_name : c->c_name;
378
379 if (!key)
380 return;
381 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
382 fatal("host_hash failed");
383
384 fprintf(stdout, "%s ", host);
385 key_write(key, stdout);
386 fputs("\n", stdout);
387 }
388
389 static int
tcpconnect(char * host)390 tcpconnect(char *host)
391 {
392 struct addrinfo hints, *ai, *aitop;
393 char strport[NI_MAXSERV];
394 int gaierr, s = -1;
395
396 snprintf(strport, sizeof strport, "%d", ssh_port);
397 memset(&hints, 0, sizeof(hints));
398 hints.ai_family = IPv4or6;
399 hints.ai_socktype = SOCK_STREAM;
400 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
401 fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
402 for (ai = aitop; ai; ai = ai->ai_next) {
403 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
404 if (s < 0) {
405 error("socket: %s", strerror(errno));
406 continue;
407 }
408 if (set_nonblock(s) == -1)
409 fatal("%s: set_nonblock(%d)", __func__, s);
410 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
411 errno != EINPROGRESS)
412 error("connect (`%s'): %s", host, strerror(errno));
413 else
414 break;
415 close(s);
416 s = -1;
417 }
418 freeaddrinfo(aitop);
419 return s;
420 }
421
422 static int
conalloc(char * iname,char * oname,int keytype)423 conalloc(char *iname, char *oname, int keytype)
424 {
425 char *namebase, *name, *namelist;
426 int s;
427
428 namebase = namelist = xstrdup(iname);
429
430 do {
431 name = xstrsep(&namelist, ",");
432 if (!name) {
433 xfree(namebase);
434 return (-1);
435 }
436 } while ((s = tcpconnect(name)) < 0);
437
438 if (s >= maxfd)
439 fatal("conalloc: fdno %d too high", s);
440 if (fdcon[s].c_status)
441 fatal("conalloc: attempt to reuse fdno %d", s);
442
443 fdcon[s].c_fd = s;
444 fdcon[s].c_status = CS_CON;
445 fdcon[s].c_namebase = namebase;
446 fdcon[s].c_name = name;
447 fdcon[s].c_namelist = namelist;
448 fdcon[s].c_output_name = xstrdup(oname);
449 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
450 fdcon[s].c_len = 4;
451 fdcon[s].c_off = 0;
452 fdcon[s].c_keytype = keytype;
453 gettimeofday(&fdcon[s].c_tv, NULL);
454 fdcon[s].c_tv.tv_sec += timeout;
455 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
456 FD_SET(s, read_wait);
457 ncon++;
458 return (s);
459 }
460
461 static void
confree(int s)462 confree(int s)
463 {
464 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
465 fatal("confree: attempt to free bad fdno %d", s);
466 close(s);
467 xfree(fdcon[s].c_namebase);
468 xfree(fdcon[s].c_output_name);
469 if (fdcon[s].c_status == CS_KEYS)
470 xfree(fdcon[s].c_data);
471 fdcon[s].c_status = CS_UNUSED;
472 fdcon[s].c_keytype = 0;
473 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
474 FD_CLR(s, read_wait);
475 ncon--;
476 }
477
478 static void
contouch(int s)479 contouch(int s)
480 {
481 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
482 gettimeofday(&fdcon[s].c_tv, NULL);
483 fdcon[s].c_tv.tv_sec += timeout;
484 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
485 }
486
487 static int
conrecycle(int s)488 conrecycle(int s)
489 {
490 con *c = &fdcon[s];
491 int ret;
492
493 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
494 confree(s);
495 return (ret);
496 }
497
498 static void
congreet(int s)499 congreet(int s)
500 {
501 int n = 0, remote_major = 0, remote_minor = 0;
502 char buf[256], *cp;
503 char remote_version[sizeof buf];
504 size_t bufsiz;
505 con *c = &fdcon[s];
506
507 for (;;) {
508 memset(buf, '\0', sizeof(buf));
509 bufsiz = sizeof(buf);
510 cp = buf;
511 while (bufsiz-- &&
512 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
513 if (*cp == '\r')
514 *cp = '\n';
515 cp++;
516 }
517 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
518 break;
519 }
520 if (n == 0) {
521 switch (errno) {
522 case EPIPE:
523 error("%s: Connection closed by remote host", c->c_name);
524 break;
525 case ECONNREFUSED:
526 break;
527 default:
528 error("read (%s): %s", c->c_name, strerror(errno));
529 break;
530 }
531 conrecycle(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 (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
541 &remote_major, &remote_minor, remote_version) == 3)
542 compat_datafellows(remote_version);
543 else
544 datafellows = 0;
545 if (c->c_keytype != KT_RSA1) {
546 if (!ssh2_capable(remote_major, remote_minor)) {
547 debug("%s doesn't support ssh2", c->c_name);
548 confree(s);
549 return;
550 }
551 } else if (remote_major != 1) {
552 debug("%s doesn't support ssh1", c->c_name);
553 confree(s);
554 return;
555 }
556 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
557 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
558 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
559 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
560 if (n < 0 || (size_t)n >= sizeof(buf)) {
561 error("snprintf: buffer too small");
562 confree(s);
563 return;
564 }
565 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
566 error("write (%s): %s", c->c_name, strerror(errno));
567 confree(s);
568 return;
569 }
570 if (c->c_keytype != KT_RSA1) {
571 keyprint(c, keygrab_ssh2(c));
572 confree(s);
573 return;
574 }
575 c->c_status = CS_SIZE;
576 contouch(s);
577 }
578
579 static void
conread(int s)580 conread(int s)
581 {
582 con *c = &fdcon[s];
583 size_t n;
584
585 if (c->c_status == CS_CON) {
586 congreet(s);
587 return;
588 }
589 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
590 if (n == 0) {
591 error("read (%s): %s", c->c_name, strerror(errno));
592 confree(s);
593 return;
594 }
595 c->c_off += n;
596
597 if (c->c_off == c->c_len)
598 switch (c->c_status) {
599 case CS_SIZE:
600 c->c_plen = htonl(c->c_plen);
601 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
602 c->c_off = 0;
603 c->c_data = xmalloc(c->c_len);
604 c->c_status = CS_KEYS;
605 break;
606 case CS_KEYS:
607 keyprint(c, keygrab_ssh1(c));
608 confree(s);
609 return;
610 default:
611 fatal("conread: invalid status %d", c->c_status);
612 break;
613 }
614
615 contouch(s);
616 }
617
618 static void
conloop(void)619 conloop(void)
620 {
621 struct timeval seltime, now;
622 fd_set *r, *e;
623 con *c;
624 int i;
625
626 gettimeofday(&now, NULL);
627 c = TAILQ_FIRST(&tq);
628
629 if (c && (c->c_tv.tv_sec > now.tv_sec ||
630 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
631 seltime = c->c_tv;
632 seltime.tv_sec -= now.tv_sec;
633 seltime.tv_usec -= now.tv_usec;
634 if (seltime.tv_usec < 0) {
635 seltime.tv_usec += 1000000;
636 seltime.tv_sec--;
637 }
638 } else
639 seltime.tv_sec = seltime.tv_usec = 0;
640
641 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
642 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
643 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
644 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
645
646 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
647 (errno == EAGAIN || errno == EINTR))
648 ;
649
650 for (i = 0; i < maxfd; i++) {
651 if (FD_ISSET(i, e)) {
652 error("%s: exception!", fdcon[i].c_name);
653 confree(i);
654 } else if (FD_ISSET(i, r))
655 conread(i);
656 }
657 xfree(r);
658 xfree(e);
659
660 c = TAILQ_FIRST(&tq);
661 while (c && (c->c_tv.tv_sec < now.tv_sec ||
662 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
663 int s = c->c_fd;
664
665 c = TAILQ_NEXT(c, c_link);
666 conrecycle(s);
667 }
668 }
669
670 static void
do_host(char * host)671 do_host(char *host)
672 {
673 char *name = strnnsep(&host, (char *)" \t\n");
674 int j;
675
676 if (name == NULL)
677 return;
678 for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
679 if (get_keytypes & j) {
680 while (ncon >= MAXCON)
681 conloop();
682 conalloc(name, *host ? host : name, j);
683 }
684 }
685 }
686
687 void
fatal(const char * fmt,...)688 fatal(const char *fmt,...)
689 {
690 va_list args;
691
692 va_start(args, fmt);
693 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
694 va_end(args);
695 if (nonfatal_fatal)
696 longjmp(kexjmp, -1);
697 else
698 exit(255);
699 }
700
701 static __dead void
usage(void)702 usage(void)
703 {
704 fprintf(stderr,
705 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
706 "\t\t [host | addrlist namelist] ...\n",
707 __progname);
708 exit(1);
709 }
710
711 int
main(int argc,char ** argv)712 main(int argc, char **argv)
713 {
714 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
715 int opt, fopt_count = 0;
716 char *tname;
717
718 TAILQ_INIT(&tq);
719
720 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
721 sanitise_stdfd();
722
723 if (argc <= 1)
724 usage();
725
726 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
727 switch (opt) {
728 case 'H':
729 hash_hosts = 1;
730 break;
731 case 'p':
732 ssh_port = a2port(optarg);
733 if (ssh_port <= 0) {
734 fprintf(stderr, "Bad port '%s'\n", optarg);
735 exit(1);
736 }
737 break;
738 case 'T':
739 timeout = convtime(optarg);
740 if (timeout == -1 || timeout == 0) {
741 fprintf(stderr, "Bad timeout '%s'\n", optarg);
742 usage();
743 }
744 break;
745 case 'v':
746 if (!debug_flag) {
747 debug_flag = 1;
748 log_level = SYSLOG_LEVEL_DEBUG1;
749 }
750 else if (log_level < SYSLOG_LEVEL_DEBUG3)
751 log_level++;
752 else
753 fatal("Too high debugging level.");
754 break;
755 case 'f':
756 if (strcmp(optarg, "-") == 0)
757 optarg = NULL;
758 argv[fopt_count++] = optarg;
759 break;
760 case 't':
761 get_keytypes = 0;
762 tname = strtok(optarg, ",");
763 while (tname) {
764 int type = key_type_from_name(tname);
765 switch (type) {
766 case KEY_RSA1:
767 get_keytypes |= KT_RSA1;
768 break;
769 case KEY_DSA:
770 get_keytypes |= KT_DSA;
771 break;
772 case KEY_RSA:
773 get_keytypes |= KT_RSA;
774 break;
775 case KEY_UNSPEC:
776 fatal("unknown key type %s", tname);
777 }
778 tname = strtok(NULL, ",");
779 }
780 break;
781 case '4':
782 IPv4or6 = AF_INET;
783 break;
784 case '6':
785 IPv4or6 = AF_INET6;
786 break;
787 case '?':
788 default:
789 usage();
790 }
791 }
792 if (optind == argc && !fopt_count)
793 usage();
794
795 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
796
797 maxfd = fdlim_get(1);
798 if (maxfd < 0)
799 fatal("%s: fdlim_get: bad value", __progname);
800 if (maxfd > MAXMAXFD)
801 maxfd = MAXMAXFD;
802 if (MAXCON <= 0)
803 fatal("%s: not enough file descriptors", __progname);
804 if (maxfd > fdlim_get(0))
805 fdlim_set(maxfd);
806 fdcon = xcalloc(maxfd, sizeof(con));
807
808 read_wait_nfdset = howmany(maxfd, NFDBITS);
809 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
810
811 if (fopt_count) {
812 Linebuf *lb;
813 char *line;
814 int j;
815
816 for (j = 0; j < fopt_count; j++) {
817 lb = Linebuf_alloc(argv[j], error);
818 if (!lb)
819 continue;
820 while ((line = Linebuf_getline(lb)) != NULL)
821 do_host(line);
822 Linebuf_free(lb);
823 }
824 }
825
826 while (optind < argc)
827 do_host(argv[optind++]);
828
829 while (ncon > 0)
830 conloop();
831
832 return (0);
833 }
834