1 /*
2 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
3 *
4 * Modification and redistribution in source and binary forms is
5 * permitted provided that due credit is given to the author and the
6 * OpenBSD project by leaving this copyright notice intact.
7 */
8
9 /*
10 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
11 * Use is subject to license terms.
12 */
13
14 #include "includes.h"
15 RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk Exp $");
16
17 #include "sys-queue.h"
18
19 #include <openssl/bn.h>
20
21 #include <setjmp.h>
22 #include "xmalloc.h"
23 #include "ssh.h"
24 #include "ssh1.h"
25 #include "key.h"
26 #include "kex.h"
27 #include "compat.h"
28 #include "myproposal.h"
29 #include "packet.h"
30 #include "dispatch.h"
31 #include "buffer.h"
32 #include "bufaux.h"
33 #include "log.h"
34 #include "atomicio.h"
35 #include "misc.h"
36
37 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
38 Default value is AF_UNSPEC means both IPv4 and IPv6. */
39 #ifdef IPV4_DEFAULT
40 int IPv4or6 = AF_INET;
41 #else
42 int IPv4or6 = AF_UNSPEC;
43 #endif
44
45 int ssh_port = SSH_DEFAULT_PORT;
46
47 #define KT_RSA1 1
48 #define KT_DSA 2
49 #define KT_RSA 4
50
51 int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
52
53 #define MAXMAXFD 256
54
55 /* The number of seconds after which to give up on a TCP connection */
56 int timeout = 5;
57
58 int maxfd;
59 #define MAXCON (maxfd - 10)
60
61 #ifdef HAVE___PROGNAME
62 extern char *__progname;
63 #else
64 char *__progname;
65 #endif
66 fd_set *read_wait;
67 size_t read_wait_size;
68 int ncon;
69 int nonfatal_fatal = 0;
70 jmp_buf kexjmp;
71 Key *kexjmp_key;
72
73 /*
74 * Keep a connection structure for each file descriptor. The state
75 * associated with file descriptor n is held in fdcon[n].
76 */
77 typedef struct Connection {
78 u_char c_status; /* State of connection on this file desc. */
79 #define CS_UNUSED 0 /* File descriptor unused */
80 #define CS_CON 1 /* Waiting to connect/read greeting */
81 #define CS_SIZE 2 /* Waiting to read initial packet size */
82 #define CS_KEYS 3 /* Waiting to read public key packet */
83 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
84 int c_plen; /* Packet length field for ssh packet */
85 int c_len; /* Total bytes which must be read. */
86 int c_off; /* Length of data read so far. */
87 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
88 char *c_namebase; /* Address to free for c_name and c_namelist */
89 char *c_name; /* Hostname of connection for errors */
90 char *c_namelist; /* Pointer to other possible addresses */
91 char *c_output_name; /* Hostname of connection for output */
92 char *c_data; /* Data read from this fd */
93 Kex *c_kex; /* The key-exchange struct for ssh2 */
94 struct timeval c_tv; /* Time at which connection gets aborted */
95 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
96 } con;
97
98 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
99 con *fdcon;
100
101 /*
102 * This is just a wrapper around fgets() to make it usable.
103 */
104
105 /* Stress-test. Increase this later. */
106 #define LINEBUF_SIZE 16
107
108 typedef struct {
109 char *buf;
110 u_int size;
111 int lineno;
112 const char *filename;
113 FILE *stream;
114 void (*errfun) (const char *,...);
115 } Linebuf;
116
117 static Linebuf *
Linebuf_alloc(const char * filename,void (* errfun)(const char *,...))118 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
119 {
120 Linebuf *lb;
121
122 if (!(lb = malloc(sizeof(*lb)))) {
123 if (errfun)
124 (*errfun) ("linebuf (%s): malloc failed\n",
125 filename ? filename : "(stdin)");
126 return (NULL);
127 }
128 if (filename) {
129 lb->filename = filename;
130 if (!(lb->stream = fopen(filename, "r"))) {
131 xfree(lb);
132 if (errfun)
133 (*errfun) ("%s: %s\n", filename, strerror(errno));
134 return (NULL);
135 }
136 } else {
137 lb->filename = "(stdin)";
138 lb->stream = stdin;
139 }
140
141 if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
142 if (errfun)
143 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
144 xfree(lb);
145 return (NULL);
146 }
147 lb->errfun = errfun;
148 lb->lineno = 0;
149 return (lb);
150 }
151
152 static void
Linebuf_free(Linebuf * lb)153 Linebuf_free(Linebuf * lb)
154 {
155 fclose(lb->stream);
156 xfree(lb->buf);
157 xfree(lb);
158 }
159
160 #if 0
161 static void
162 Linebuf_restart(Linebuf * lb)
163 {
164 clearerr(lb->stream);
165 rewind(lb->stream);
166 lb->lineno = 0;
167 }
168
169 static int
170 Linebuf_lineno(Linebuf * lb)
171 {
172 return (lb->lineno);
173 }
174 #endif
175
176 static char *
Linebuf_getline(Linebuf * lb)177 Linebuf_getline(Linebuf * lb)
178 {
179 int n = 0;
180 void *p;
181
182 lb->lineno++;
183 for (;;) {
184 /* Read a line */
185 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
186 if (ferror(lb->stream) && lb->errfun)
187 (*lb->errfun)("%s: %s\n", lb->filename,
188 strerror(errno));
189 return (NULL);
190 }
191 n = strlen(lb->buf);
192
193 /* Return it or an error if it fits */
194 if (n > 0 && lb->buf[n - 1] == '\n') {
195 lb->buf[n - 1] = '\0';
196 return (lb->buf);
197 }
198 if (n != lb->size - 1) {
199 if (lb->errfun)
200 (*lb->errfun)("%s: skipping incomplete last line\n",
201 lb->filename);
202 return (NULL);
203 }
204 /* Double the buffer if we need more space */
205 lb->size *= 2;
206 if ((p = realloc(lb->buf, lb->size)) == NULL) {
207 lb->size /= 2;
208 if (lb->errfun)
209 (*lb->errfun)("linebuf (%s): realloc failed\n",
210 lb->filename);
211 return (NULL);
212 }
213 lb->buf = p;
214 }
215 }
216
217 static int
fdlim_get(int hard)218 fdlim_get(int hard)
219 {
220 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
221 struct rlimit rlfd;
222
223 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
224 return (-1);
225 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
226 return 10000;
227 else
228 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
229 #elif defined (HAVE_SYSCONF)
230 return sysconf (_SC_OPEN_MAX);
231 #else
232 return 10000;
233 #endif
234 }
235
236 static int
fdlim_set(int lim)237 fdlim_set(int lim)
238 {
239 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
240 struct rlimit rlfd;
241 #endif
242
243 if (lim <= 0)
244 return (-1);
245 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
246 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
247 return (-1);
248 rlfd.rlim_cur = lim;
249 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
250 return (-1);
251 #elif defined (HAVE_SETDTABLESIZE)
252 setdtablesize(lim);
253 #endif
254 return (0);
255 }
256
257 /*
258 * This is an strsep function that returns a null field for adjacent
259 * separators. This is the same as the 4.4BSD strsep, but different from the
260 * one in the GNU libc.
261 */
262 static char *
xstrsep(char ** str,const char * delim)263 xstrsep(char **str, const char *delim)
264 {
265 char *s, *e;
266
267 if (!**str)
268 return (NULL);
269
270 s = *str;
271 e = s + strcspn(s, delim);
272
273 if (*e != '\0')
274 *e++ = '\0';
275 *str = e;
276
277 return (s);
278 }
279
280 /*
281 * Get the next non-null token (like GNU strsep). Strsep() will return a
282 * null token for two adjacent separators, so we may have to loop.
283 */
284 static char *
strnnsep(char ** stringp,char * delim)285 strnnsep(char **stringp, char *delim)
286 {
287 char *tok;
288
289 do {
290 tok = xstrsep(stringp, delim);
291 } while (tok && *tok == '\0');
292 return (tok);
293 }
294
295 static Key *
keygrab_ssh1(con * c)296 keygrab_ssh1(con *c)
297 {
298 static Key *rsa;
299 static Buffer msg;
300
301 if (rsa == NULL) {
302 buffer_init(&msg);
303 rsa = key_new(KEY_RSA1);
304 }
305 buffer_append(&msg, c->c_data, c->c_plen);
306 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
307 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
308 error("%s: invalid packet type", c->c_name);
309 buffer_clear(&msg);
310 return NULL;
311 }
312 buffer_consume(&msg, 8); /* cookie */
313
314 /* server key */
315 (void) buffer_get_int(&msg);
316 buffer_get_bignum(&msg, rsa->rsa->e);
317 buffer_get_bignum(&msg, rsa->rsa->n);
318
319 /* host key */
320 (void) buffer_get_int(&msg);
321 buffer_get_bignum(&msg, rsa->rsa->e);
322 buffer_get_bignum(&msg, rsa->rsa->n);
323
324 buffer_clear(&msg);
325
326 return (rsa);
327 }
328
329 static int
hostjump(Key * hostkey)330 hostjump(Key *hostkey)
331 {
332 kexjmp_key = hostkey;
333 longjmp(kexjmp, 1);
334 /* NOTREACHED */
335 return (0);
336 }
337
338 static int
ssh2_capable(int remote_major,int remote_minor)339 ssh2_capable(int remote_major, int remote_minor)
340 {
341 switch (remote_major) {
342 case 1:
343 if (remote_minor == 99)
344 return 1;
345 break;
346 case 2:
347 return 1;
348 default:
349 break;
350 }
351 return 0;
352 }
353
354 static Key *
keygrab_ssh2(con * c)355 keygrab_ssh2(con *c)
356 {
357 int j;
358
359 packet_set_connection(c->c_fd, c->c_fd);
360 enable_compat20();
361 my_clnt_proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
362 c->c_keytype == KT_DSA? "ssh-dss": "ssh-rsa";
363 c->c_kex = kex_setup(c->c_name, my_clnt_proposal, NULL);
364 kex_start(c->c_kex);
365 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
366 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
367 c->c_kex->verify_host_key = hostjump;
368
369 if (!(j = setjmp(kexjmp))) {
370 nonfatal_fatal = 1;
371 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
372 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
373 exit(1);
374 }
375 nonfatal_fatal = 0;
376 xfree(c->c_kex);
377 c->c_kex = NULL;
378 packet_close();
379
380 return j < 0? NULL : kexjmp_key;
381 }
382
383 static void
keyprint(con * c,Key * key)384 keyprint(con *c, Key *key)
385 {
386 if (!key)
387 return;
388
389 fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
390 key_write(key, stdout);
391 fputs("\n", stdout);
392 }
393
394 static int
tcpconnect(char * host)395 tcpconnect(char *host)
396 {
397 struct addrinfo hints, *ai, *aitop;
398 char strport[NI_MAXSERV];
399 int gaierr, s = -1;
400
401 snprintf(strport, sizeof strport, "%d", ssh_port);
402 memset(&hints, 0, sizeof(hints));
403 hints.ai_family = IPv4or6;
404 hints.ai_socktype = SOCK_STREAM;
405 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
406 fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
407 for (ai = aitop; ai; ai = ai->ai_next) {
408 s = socket(ai->ai_family, SOCK_STREAM, 0);
409 if (s < 0) {
410 error("socket: %s", strerror(errno));
411 continue;
412 }
413 if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
414 fatal("F_SETFL: %s", strerror(errno));
415 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
416 errno != EINPROGRESS)
417 error("connect (`%s'): %s", host, strerror(errno));
418 else
419 break;
420 close(s);
421 s = -1;
422 }
423 freeaddrinfo(aitop);
424 return s;
425 }
426
427 static int
conalloc(char * iname,char * oname,int keytype)428 conalloc(char *iname, char *oname, int keytype)
429 {
430 char *namebase, *name, *namelist;
431 int s;
432
433 namebase = namelist = xstrdup(iname);
434
435 do {
436 name = xstrsep(&namelist, ",");
437 if (!name) {
438 xfree(namebase);
439 return (-1);
440 }
441 } while ((s = tcpconnect(name)) < 0);
442
443 if (s >= maxfd)
444 fatal("conalloc: fdno %d too high", s);
445 if (fdcon[s].c_status)
446 fatal("conalloc: attempt to reuse fdno %d", s);
447
448 fdcon[s].c_fd = s;
449 fdcon[s].c_status = CS_CON;
450 fdcon[s].c_namebase = namebase;
451 fdcon[s].c_name = name;
452 fdcon[s].c_namelist = namelist;
453 fdcon[s].c_output_name = xstrdup(oname);
454 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
455 fdcon[s].c_len = 4;
456 fdcon[s].c_off = 0;
457 fdcon[s].c_keytype = keytype;
458 gettimeofday(&fdcon[s].c_tv, NULL);
459 fdcon[s].c_tv.tv_sec += timeout;
460 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
461 FD_SET(s, read_wait);
462 ncon++;
463 return (s);
464 }
465
466 static void
confree(int s)467 confree(int s)
468 {
469 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
470 fatal("confree: attempt to free bad fdno %d", s);
471 close(s);
472 xfree(fdcon[s].c_namebase);
473 xfree(fdcon[s].c_output_name);
474 if (fdcon[s].c_status == CS_KEYS)
475 xfree(fdcon[s].c_data);
476 fdcon[s].c_status = CS_UNUSED;
477 fdcon[s].c_keytype = 0;
478 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
479 FD_CLR(s, read_wait);
480 ncon--;
481 }
482
483 static void
contouch(int s)484 contouch(int s)
485 {
486 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
487 gettimeofday(&fdcon[s].c_tv, NULL);
488 fdcon[s].c_tv.tv_sec += timeout;
489 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
490 }
491
492 static int
conrecycle(int s)493 conrecycle(int s)
494 {
495 con *c = &fdcon[s];
496 int ret;
497
498 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
499 confree(s);
500 return (ret);
501 }
502
503 static void
congreet(int s)504 congreet(int s)
505 {
506 int remote_major, remote_minor, n = 0;
507 char buf[256], *cp;
508 char remote_version[sizeof buf];
509 size_t bufsiz;
510 con *c = &fdcon[s];
511
512 bufsiz = sizeof(buf);
513 cp = buf;
514 while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
515 if (*cp == '\r')
516 *cp = '\n';
517 cp++;
518 }
519 if (n < 0) {
520 if (errno != ECONNREFUSED)
521 error("read (%s): %s", c->c_name, strerror(errno));
522 conrecycle(s);
523 return;
524 }
525 if (n == 0) {
526 error("%s: Connection closed by remote host", c->c_name);
527 conrecycle(s);
528 return;
529 }
530 if (*cp != '\n' && *cp != '\r') {
531 error("%s: bad greeting", c->c_name);
532 confree(s);
533 return;
534 }
535 *cp = '\0';
536 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
537 &remote_major, &remote_minor, remote_version) == 3)
538 compat_datafellows(remote_version);
539 else
540 datafellows = 0;
541 if (c->c_keytype != KT_RSA1) {
542 if (!ssh2_capable(remote_major, remote_minor)) {
543 debug("%s doesn't support ssh2", c->c_name);
544 confree(s);
545 return;
546 }
547 } else if (remote_major != 1) {
548 debug("%s doesn't support ssh1", c->c_name);
549 confree(s);
550 return;
551 }
552 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
553 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
554 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
555 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
556 if (atomicio(write, s, buf, n) != n) {
557 error("write (%s): %s", c->c_name, strerror(errno));
558 confree(s);
559 return;
560 }
561 if (c->c_keytype != KT_RSA1) {
562 keyprint(c, keygrab_ssh2(c));
563 confree(s);
564 return;
565 }
566 c->c_status = CS_SIZE;
567 contouch(s);
568 }
569
570 static void
conread(int s)571 conread(int s)
572 {
573 con *c = &fdcon[s];
574 int n;
575
576 if (c->c_status == CS_CON) {
577 congreet(s);
578 return;
579 }
580 n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
581 if (n < 0) {
582 error("read (%s): %s", c->c_name, strerror(errno));
583 confree(s);
584 return;
585 }
586 c->c_off += n;
587
588 if (c->c_off == c->c_len)
589 switch (c->c_status) {
590 case CS_SIZE:
591 c->c_plen = htonl(c->c_plen);
592 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
593 c->c_off = 0;
594 c->c_data = xmalloc(c->c_len);
595 c->c_status = CS_KEYS;
596 break;
597 case CS_KEYS:
598 keyprint(c, keygrab_ssh1(c));
599 confree(s);
600 return;
601 break;
602 default:
603 fatal("conread: invalid status %d", c->c_status);
604 break;
605 }
606
607 contouch(s);
608 }
609
610 static void
conloop(void)611 conloop(void)
612 {
613 struct timeval seltime, now;
614 fd_set *r, *e;
615 con *c;
616 int i;
617
618 gettimeofday(&now, NULL);
619 c = TAILQ_FIRST(&tq);
620
621 if (c && (c->c_tv.tv_sec > now.tv_sec ||
622 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
623 seltime = c->c_tv;
624 seltime.tv_sec -= now.tv_sec;
625 seltime.tv_usec -= now.tv_usec;
626 if (seltime.tv_usec < 0) {
627 seltime.tv_usec += 1000000;
628 seltime.tv_sec--;
629 }
630 } else
631 seltime.tv_sec = seltime.tv_usec = 0;
632
633 r = xmalloc(read_wait_size);
634 memcpy(r, read_wait, read_wait_size);
635 e = xmalloc(read_wait_size);
636 memcpy(e, read_wait, read_wait_size);
637
638 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
639 (errno == EAGAIN || errno == EINTR))
640 ;
641
642 for (i = 0; i < maxfd; i++) {
643 if (FD_ISSET(i, e)) {
644 error("%s: exception!", fdcon[i].c_name);
645 confree(i);
646 } else if (FD_ISSET(i, r))
647 conread(i);
648 }
649 xfree(r);
650 xfree(e);
651
652 c = TAILQ_FIRST(&tq);
653 while (c && (c->c_tv.tv_sec < now.tv_sec ||
654 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
655 int s = c->c_fd;
656
657 c = TAILQ_NEXT(c, c_link);
658 conrecycle(s);
659 }
660 }
661
662 static void
do_host(char * host)663 do_host(char *host)
664 {
665 char *name = strnnsep(&host, " \t\n");
666 int j;
667
668 if (name == NULL)
669 return;
670 for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
671 if (get_keytypes & j) {
672 while (ncon >= MAXCON)
673 conloop();
674 conalloc(name, *host ? host : name, j);
675 }
676 }
677 }
678
679 void
fatal(const char * fmt,...)680 fatal(const char *fmt,...)
681 {
682 va_list args;
683
684 va_start(args, fmt);
685 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
686 va_end(args);
687 if (nonfatal_fatal)
688 longjmp(kexjmp, -1);
689 else
690 fatal_cleanup();
691 }
692
693 static void
usage(void)694 usage(void)
695 {
696 fprintf(stderr,
697 gettext("Usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
698 "\t\t [host | addrlist namelist] [...]\n"),
699 __progname);
700 exit(1);
701 }
702
703 int
main(int argc,char ** argv)704 main(int argc, char **argv)
705 {
706 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
707 int opt, fopt_count = 0;
708 char *tname;
709
710 extern int optind;
711 extern char *optarg;
712
713 __progname = get_progname(argv[0]);
714
715 (void) g11n_setlocale(LC_ALL, "");
716
717 init_rng();
718 seed_rng();
719 TAILQ_INIT(&tq);
720
721 if (argc <= 1)
722 usage();
723
724 while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
725 switch (opt) {
726 case 'p':
727 ssh_port = a2port(optarg);
728 if (ssh_port == 0) {
729 fprintf(stderr, gettext("Bad port '%s'\n"),
730 optarg);
731 exit(1);
732 }
733 break;
734 case 'T':
735 timeout = convtime(optarg);
736 if (timeout == -1 || timeout == 0) {
737 fprintf(stderr, gettext("Bad timeout '%s'\n"),
738 optarg);
739 usage();
740 }
741 break;
742 case 'v':
743 if (!debug_flag) {
744 debug_flag = 1;
745 log_level = SYSLOG_LEVEL_DEBUG1;
746 }
747 else if (log_level < SYSLOG_LEVEL_DEBUG3)
748 log_level++;
749 else
750 fatal("Too high debugging level.");
751 break;
752 case 'f':
753 if (strcmp(optarg, "-") == 0)
754 optarg = NULL;
755 argv[fopt_count++] = optarg;
756 break;
757 case 't':
758 get_keytypes = 0;
759 tname = strtok(optarg, ",");
760 while (tname) {
761 int type = key_type_from_name(tname);
762 switch (type) {
763 case KEY_RSA1:
764 get_keytypes |= KT_RSA1;
765 break;
766 case KEY_DSA:
767 get_keytypes |= KT_DSA;
768 break;
769 case KEY_RSA:
770 get_keytypes |= KT_RSA;
771 break;
772 case KEY_UNSPEC:
773 fatal("unknown key type %s", tname);
774 }
775 tname = strtok(NULL, ",");
776 }
777 break;
778 case '4':
779 IPv4or6 = AF_INET;
780 break;
781 case '6':
782 IPv4or6 = AF_INET6;
783 break;
784 case '?':
785 default:
786 usage();
787 }
788 }
789 if (optind == argc && !fopt_count)
790 usage();
791
792 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
793
794 maxfd = fdlim_get(1);
795 if (maxfd < 0)
796 fatal("%s: fdlim_get: bad value", __progname);
797 if (maxfd > MAXMAXFD)
798 maxfd = MAXMAXFD;
799 if (MAXCON <= 0)
800 fatal("%s: not enough file descriptors", __progname);
801 if (maxfd > fdlim_get(0))
802 fdlim_set(maxfd);
803 fdcon = xmalloc(maxfd * sizeof(con));
804 memset(fdcon, 0, maxfd * sizeof(con));
805
806 read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
807 read_wait = xmalloc(read_wait_size);
808 memset(read_wait, 0, read_wait_size);
809
810 if (fopt_count) {
811 Linebuf *lb;
812 char *line;
813 int j;
814
815 for (j = 0; j < fopt_count; j++) {
816 lb = Linebuf_alloc(argv[j], error);
817 if (!lb)
818 continue;
819 while ((line = Linebuf_getline(lb)) != NULL)
820 do_host(line);
821 Linebuf_free(lb);
822 }
823 }
824
825 while (optind < argc)
826 do_host(argv[optind++]);
827
828 while (ncon > 0)
829 conloop();
830
831 return (0);
832 }
833