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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 | #include "includes.h" | |
10 | RCSID("$OpenBSD: ssh-keyscan.c,v 1.30 2001/10/08 19:05:05 markus Exp $"); | |
11 | ||
12 | #if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H) | |
13 | #include <sys/queue.h> | |
14 | #else | |
15 | #include "openbsd-compat/fake-queue.h" | |
16 | #endif | |
17 | #include <errno.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 | int IPv4or6 = AF_UNSPEC; | |
40 | ||
41 | int ssh_port = SSH_DEFAULT_PORT; | |
42 | ||
43 | #define KT_RSA1 1 | |
44 | #define KT_DSA 2 | |
45 | #define KT_RSA 4 | |
46 | ||
47 | int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */ | |
48 | ||
49 | #define MAXMAXFD 256 | |
50 | ||
51 | /* The number of seconds after which to give up on a TCP connection */ | |
52 | int timeout = 5; | |
53 | ||
54 | int maxfd; | |
55 | #define MAXCON (maxfd - 10) | |
56 | ||
57 | #ifdef HAVE___PROGNAME | |
58 | extern char *__progname; | |
59 | #else | |
60 | char *__progname; | |
61 | #endif | |
62 | fd_set *read_wait; | |
63 | size_t read_wait_size; | |
64 | int ncon; | |
65 | int nonfatal_fatal = 0; | |
66 | jmp_buf kexjmp; | |
67 | Key *kexjmp_key; | |
68 | ||
69 | /* | |
70 | * Keep a connection structure for each file descriptor. The state | |
71 | * associated with file descriptor n is held in fdcon[n]. | |
72 | */ | |
73 | typedef struct Connection { | |
74 | u_char c_status; /* State of connection on this file desc. */ | |
75 | #define CS_UNUSED 0 /* File descriptor unused */ | |
76 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
77 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
78 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
79 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
80 | int c_plen; /* Packet length field for ssh packet */ | |
81 | int c_len; /* Total bytes which must be read. */ | |
82 | int c_off; /* Length of data read so far. */ | |
83 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ | |
84 | char *c_namebase; /* Address to free for c_name and c_namelist */ | |
85 | char *c_name; /* Hostname of connection for errors */ | |
86 | char *c_namelist; /* Pointer to other possible addresses */ | |
87 | char *c_output_name; /* Hostname of connection for output */ | |
88 | char *c_data; /* Data read from this fd */ | |
89 | Kex *c_kex; /* The key-exchange struct for ssh2 */ | |
90 | struct timeval c_tv; /* Time at which connection gets aborted */ | |
91 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
92 | } con; | |
93 | ||
94 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
95 | con *fdcon; | |
96 | ||
97 | /* | |
98 | * This is just a wrapper around fgets() to make it usable. | |
99 | */ | |
100 | ||
101 | /* Stress-test. Increase this later. */ | |
102 | #define LINEBUF_SIZE 16 | |
103 | ||
104 | typedef struct { | |
105 | char *buf; | |
106 | u_int size; | |
107 | int lineno; | |
108 | const char *filename; | |
109 | FILE *stream; | |
110 | void (*errfun) (const char *,...); | |
111 | } Linebuf; | |
112 | ||
113 | static Linebuf * | |
114 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) | |
115 | { | |
116 | Linebuf *lb; | |
117 | ||
118 | if (!(lb = malloc(sizeof(*lb)))) { | |
119 | if (errfun) | |
120 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
121 | return (NULL); | |
122 | } | |
123 | if (filename) { | |
124 | lb->filename = filename; | |
125 | if (!(lb->stream = fopen(filename, "r"))) { | |
126 | xfree(lb); | |
127 | if (errfun) | |
128 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
129 | return (NULL); | |
130 | } | |
131 | } else { | |
132 | lb->filename = "(stdin)"; | |
133 | lb->stream = stdin; | |
134 | } | |
135 | ||
136 | if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) { | |
137 | if (errfun) | |
138 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
139 | xfree(lb); | |
140 | return (NULL); | |
141 | } | |
142 | lb->errfun = errfun; | |
143 | lb->lineno = 0; | |
144 | return (lb); | |
145 | } | |
146 | ||
147 | static void | |
148 | Linebuf_free(Linebuf * lb) | |
149 | { | |
150 | fclose(lb->stream); | |
151 | xfree(lb->buf); | |
152 | xfree(lb); | |
153 | } | |
154 | ||
155 | #if 0 | |
156 | static void | |
157 | Linebuf_restart(Linebuf * lb) | |
158 | { | |
159 | clearerr(lb->stream); | |
160 | rewind(lb->stream); | |
161 | lb->lineno = 0; | |
162 | } | |
163 | ||
164 | static int | |
165 | Linebuf_lineno(Linebuf * lb) | |
166 | { | |
167 | return (lb->lineno); | |
168 | } | |
169 | #endif | |
170 | ||
171 | static char * | |
172 | Linebuf_getline(Linebuf * lb) | |
173 | { | |
174 | int n = 0; | |
175 | ||
176 | lb->lineno++; | |
177 | for (;;) { | |
178 | /* Read a line */ | |
179 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
180 | if (ferror(lb->stream) && lb->errfun) | |
181 | (*lb->errfun) ("%s: %s\n", lb->filename, | |
182 | strerror(errno)); | |
183 | return (NULL); | |
184 | } | |
185 | n = strlen(lb->buf); | |
186 | ||
187 | /* Return it or an error if it fits */ | |
188 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
189 | lb->buf[n - 1] = '\0'; | |
190 | return (lb->buf); | |
191 | } | |
192 | if (n != lb->size - 1) { | |
193 | if (lb->errfun) | |
194 | (*lb->errfun) ("%s: skipping incomplete last line\n", | |
195 | lb->filename); | |
196 | return (NULL); | |
197 | } | |
198 | /* Double the buffer if we need more space */ | |
199 | if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) { | |
200 | if (lb->errfun) | |
201 | (*lb->errfun) ("linebuf (%s): realloc failed\n", | |
202 | lb->filename); | |
203 | return (NULL); | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | static int | |
209 | fdlim_get(int hard) | |
210 | { | |
211 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) | |
212 | struct rlimit rlfd; | |
213 | ||
214 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
215 | return (-1); | |
216 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
217 | return 10000; | |
218 | else | |
219 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
220 | #elif defined (HAVE_SYSCONF) | |
221 | return sysconf (_SC_OPEN_MAX); | |
222 | #else | |
223 | return 10000; | |
224 | #endif | |
225 | } | |
226 | ||
227 | static int | |
228 | fdlim_set(int lim) | |
229 | { | |
230 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
231 | struct rlimit rlfd; | |
232 | #endif | |
233 | if (lim <= 0) | |
234 | return (-1); | |
235 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
236 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
237 | return (-1); | |
238 | rlfd.rlim_cur = lim; | |
239 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
240 | return (-1); | |
241 | #elif defined (HAVE_SETDTABLESIZE) | |
242 | setdtablesize(lim); | |
243 | #endif | |
244 | return (0); | |
245 | } | |
246 | ||
247 | /* | |
248 | * This is an strsep function that returns a null field for adjacent | |
249 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
250 | * one in the GNU libc. | |
251 | */ | |
252 | static char * | |
253 | xstrsep(char **str, const char *delim) | |
254 | { | |
255 | char *s, *e; | |
256 | ||
257 | if (!**str) | |
258 | return (NULL); | |
259 | ||
260 | s = *str; | |
261 | e = s + strcspn(s, delim); | |
262 | ||
263 | if (*e != '\0') | |
264 | *e++ = '\0'; | |
265 | *str = e; | |
266 | ||
267 | return (s); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
272 | * null token for two adjacent separators, so we may have to loop. | |
273 | */ | |
274 | static char * | |
275 | strnnsep(char **stringp, char *delim) | |
276 | { | |
277 | char *tok; | |
278 | ||
279 | do { | |
280 | tok = xstrsep(stringp, delim); | |
281 | } while (tok && *tok == '\0'); | |
282 | return (tok); | |
283 | } | |
284 | ||
285 | static Key * | |
286 | keygrab_ssh1(con *c) | |
287 | { | |
288 | static Key *rsa; | |
289 | static Buffer msg; | |
290 | ||
291 | if (rsa == NULL) { | |
292 | buffer_init(&msg); | |
293 | rsa = key_new(KEY_RSA1); | |
294 | } | |
295 | buffer_append(&msg, c->c_data, c->c_plen); | |
296 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
297 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { | |
298 | error("%s: invalid packet type", c->c_name); | |
299 | buffer_clear(&msg); | |
300 | return NULL; | |
301 | } | |
302 | buffer_consume(&msg, 8); /* cookie */ | |
303 | ||
304 | /* server key */ | |
305 | (void) buffer_get_int(&msg); | |
306 | buffer_get_bignum(&msg, rsa->rsa->e); | |
307 | buffer_get_bignum(&msg, rsa->rsa->n); | |
308 | ||
309 | /* host key */ | |
310 | (void) buffer_get_int(&msg); | |
311 | buffer_get_bignum(&msg, rsa->rsa->e); | |
312 | buffer_get_bignum(&msg, rsa->rsa->n); | |
313 | ||
314 | buffer_clear(&msg); | |
315 | ||
316 | return (rsa); | |
317 | } | |
318 | ||
319 | static int | |
320 | hostjump(Key *hostkey) | |
321 | { | |
322 | kexjmp_key = hostkey; | |
323 | longjmp(kexjmp, 1); | |
324 | } | |
325 | ||
326 | static int | |
327 | ssh2_capable(int remote_major, int remote_minor) | |
328 | { | |
329 | switch (remote_major) { | |
330 | case 1: | |
331 | if (remote_minor == 99) | |
332 | return 1; | |
333 | break; | |
334 | case 2: | |
335 | return 1; | |
336 | default: | |
337 | break; | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static Key * | |
343 | keygrab_ssh2(con *c) | |
344 | { | |
345 | int j; | |
346 | ||
347 | packet_set_connection(c->c_fd, c->c_fd); | |
348 | enable_compat20(); | |
349 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
350 | "ssh-dss": "ssh-rsa"; | |
351 | c->c_kex = kex_setup(myproposal); | |
352 | c->c_kex->verify_host_key = hostjump; | |
353 | ||
354 | if (!(j = setjmp(kexjmp))) { | |
355 | nonfatal_fatal = 1; | |
356 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
357 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
358 | exit(1); | |
359 | } | |
360 | nonfatal_fatal = 0; | |
361 | xfree(c->c_kex); | |
362 | c->c_kex = NULL; | |
363 | packet_close(); | |
364 | ||
365 | return j < 0? NULL : kexjmp_key; | |
366 | } | |
367 | ||
368 | static void | |
369 | keyprint(con *c, Key *key) | |
370 | { | |
371 | if (!key) | |
372 | return; | |
373 | ||
374 | fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name); | |
375 | key_write(key, stdout); | |
376 | fputs("\n", stdout); | |
377 | } | |
378 | ||
379 | static int | |
380 | tcpconnect(char *host) | |
381 | { | |
382 | struct addrinfo hints, *ai, *aitop; | |
383 | char strport[NI_MAXSERV]; | |
384 | int gaierr, s = -1; | |
385 | ||
386 | snprintf(strport, sizeof strport, "%d", ssh_port); | |
387 | memset(&hints, 0, sizeof(hints)); | |
388 | hints.ai_family = IPv4or6; | |
389 | hints.ai_socktype = SOCK_STREAM; | |
390 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
391 | fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); | |
392 | for (ai = aitop; ai; ai = ai->ai_next) { | |
393 | s = socket(ai->ai_family, SOCK_STREAM, 0); | |
394 | if (s < 0) { | |
395 | error("socket: %s", strerror(errno)); | |
396 | continue; | |
397 | } | |
398 | if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) | |
399 | fatal("F_SETFL: %s", strerror(errno)); | |
400 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && | |
401 | errno != EINPROGRESS) | |
402 | error("connect (`%s'): %s", host, strerror(errno)); | |
403 | else | |
404 | break; | |
405 | close(s); | |
406 | s = -1; | |
407 | } | |
408 | freeaddrinfo(aitop); | |
409 | return s; | |
410 | } | |
411 | ||
412 | static int | |
413 | conalloc(char *iname, char *oname, int keytype) | |
414 | { | |
415 | int s; | |
416 | char *namebase, *name, *namelist; | |
417 | ||
418 | namebase = namelist = xstrdup(iname); | |
419 | ||
420 | do { | |
421 | name = xstrsep(&namelist, ","); | |
422 | if (!name) { | |
423 | xfree(namebase); | |
424 | return (-1); | |
425 | } | |
426 | } while ((s = tcpconnect(name)) < 0); | |
427 | ||
428 | if (s >= maxfd) | |
429 | fatal("conalloc: fdno %d too high", s); | |
430 | if (fdcon[s].c_status) | |
431 | fatal("conalloc: attempt to reuse fdno %d", s); | |
432 | ||
433 | fdcon[s].c_fd = s; | |
434 | fdcon[s].c_status = CS_CON; | |
435 | fdcon[s].c_namebase = namebase; | |
436 | fdcon[s].c_name = name; | |
437 | fdcon[s].c_namelist = namelist; | |
438 | fdcon[s].c_output_name = xstrdup(oname); | |
439 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
440 | fdcon[s].c_len = 4; | |
441 | fdcon[s].c_off = 0; | |
442 | fdcon[s].c_keytype = keytype; | |
443 | gettimeofday(&fdcon[s].c_tv, NULL); | |
444 | fdcon[s].c_tv.tv_sec += timeout; | |
445 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
446 | FD_SET(s, read_wait); | |
447 | ncon++; | |
448 | return (s); | |
449 | } | |
450 | ||
451 | static void | |
452 | confree(int s) | |
453 | { | |
454 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) | |
455 | fatal("confree: attempt to free bad fdno %d", s); | |
456 | close(s); | |
457 | xfree(fdcon[s].c_namebase); | |
458 | xfree(fdcon[s].c_output_name); | |
459 | if (fdcon[s].c_status == CS_KEYS) | |
460 | xfree(fdcon[s].c_data); | |
461 | fdcon[s].c_status = CS_UNUSED; | |
462 | fdcon[s].c_keytype = 0; | |
463 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
464 | FD_CLR(s, read_wait); | |
465 | ncon--; | |
466 | } | |
467 | ||
468 | static void | |
469 | contouch(int s) | |
470 | { | |
471 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
472 | gettimeofday(&fdcon[s].c_tv, NULL); | |
473 | fdcon[s].c_tv.tv_sec += timeout; | |
474 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
475 | } | |
476 | ||
477 | static int | |
478 | conrecycle(int s) | |
479 | { | |
480 | int ret; | |
481 | con *c = &fdcon[s]; | |
482 | ||
483 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); | |
484 | confree(s); | |
485 | return (ret); | |
486 | } | |
487 | ||
488 | static void | |
489 | congreet(int s) | |
490 | { | |
491 | char buf[256], *cp; | |
492 | size_t bufsiz; | |
493 | int n = 0; | |
494 | con *c = &fdcon[s]; | |
495 | ||
496 | bufsiz = sizeof(buf); | |
497 | cp = buf; | |
498 | while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') { | |
499 | if (*cp == '\r') | |
500 | *cp = '\n'; | |
501 | cp++; | |
502 | } | |
503 | if (n < 0) { | |
504 | if (errno != ECONNREFUSED) | |
505 | error("read (%s): %s", c->c_name, strerror(errno)); | |
506 | conrecycle(s); | |
507 | return; | |
508 | } | |
509 | if (*cp != '\n' && *cp != '\r') { | |
510 | error("%s: bad greeting", c->c_name); | |
511 | confree(s); | |
512 | return; | |
513 | } | |
514 | *cp = '\0'; | |
515 | if (c->c_keytype != KT_RSA1) { | |
516 | int remote_major, remote_minor; | |
517 | char remote_version[sizeof buf]; | |
518 | ||
519 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", | |
520 | &remote_major, &remote_minor, remote_version) == 3) | |
521 | compat_datafellows(remote_version); | |
522 | else | |
523 | datafellows = 0; | |
524 | if (!ssh2_capable(remote_major, remote_minor)) { | |
525 | debug("%s doesn't support ssh2", c->c_name); | |
526 | confree(s); | |
527 | return; | |
528 | } | |
529 | } | |
530 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); | |
531 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", | |
532 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
533 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
534 | if (atomicio(write, s, buf, n) != n) { | |
535 | error("write (%s): %s", c->c_name, strerror(errno)); | |
536 | confree(s); | |
537 | return; | |
538 | } | |
539 | if (c->c_keytype != KT_RSA1) { | |
540 | keyprint(c, keygrab_ssh2(c)); | |
541 | confree(s); | |
542 | return; | |
543 | } | |
544 | c->c_status = CS_SIZE; | |
545 | contouch(s); | |
546 | } | |
547 | ||
548 | static void | |
549 | conread(int s) | |
550 | { | |
551 | int n; | |
552 | con *c = &fdcon[s]; | |
553 | ||
554 | if (c->c_status == CS_CON) { | |
555 | congreet(s); | |
556 | return; | |
557 | } | |
558 | n = read(s, c->c_data + c->c_off, c->c_len - c->c_off); | |
559 | if (n < 0) { | |
560 | error("read (%s): %s", c->c_name, strerror(errno)); | |
561 | confree(s); | |
562 | return; | |
563 | } | |
564 | c->c_off += n; | |
565 | ||
566 | if (c->c_off == c->c_len) | |
567 | switch (c->c_status) { | |
568 | case CS_SIZE: | |
569 | c->c_plen = htonl(c->c_plen); | |
570 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
571 | c->c_off = 0; | |
572 | c->c_data = xmalloc(c->c_len); | |
573 | c->c_status = CS_KEYS; | |
574 | break; | |
575 | case CS_KEYS: | |
576 | keyprint(c, keygrab_ssh1(c)); | |
577 | confree(s); | |
578 | return; | |
579 | break; | |
580 | default: | |
581 | fatal("conread: invalid status %d", c->c_status); | |
582 | break; | |
583 | } | |
584 | ||
585 | contouch(s); | |
586 | } | |
587 | ||
588 | static void | |
589 | conloop(void) | |
590 | { | |
591 | fd_set *r, *e; | |
592 | struct timeval seltime, now; | |
593 | int i; | |
594 | con *c; | |
595 | ||
596 | gettimeofday(&now, NULL); | |
597 | c = tq.tqh_first; | |
598 | ||
599 | if (c && (c->c_tv.tv_sec > now.tv_sec || | |
600 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
601 | seltime = c->c_tv; | |
602 | seltime.tv_sec -= now.tv_sec; | |
603 | seltime.tv_usec -= now.tv_usec; | |
604 | if (seltime.tv_usec < 0) { | |
605 | seltime.tv_usec += 1000000; | |
606 | seltime.tv_sec--; | |
607 | } | |
608 | } else | |
609 | seltime.tv_sec = seltime.tv_usec = 0; | |
610 | ||
611 | r = xmalloc(read_wait_size); | |
612 | memcpy(r, read_wait, read_wait_size); | |
613 | e = xmalloc(read_wait_size); | |
614 | memcpy(e, read_wait, read_wait_size); | |
615 | ||
616 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
617 | (errno == EAGAIN || errno == EINTR)) | |
618 | ; | |
619 | ||
620 | for (i = 0; i < maxfd; i++) { | |
621 | if (FD_ISSET(i, e)) { | |
622 | error("%s: exception!", fdcon[i].c_name); | |
623 | confree(i); | |
624 | } else if (FD_ISSET(i, r)) | |
625 | conread(i); | |
626 | } | |
627 | xfree(r); | |
628 | xfree(e); | |
629 | ||
630 | c = tq.tqh_first; | |
631 | while (c && (c->c_tv.tv_sec < now.tv_sec || | |
632 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
633 | int s = c->c_fd; | |
634 | ||
635 | c = c->c_link.tqe_next; | |
636 | conrecycle(s); | |
637 | } | |
638 | } | |
639 | ||
640 | static void | |
641 | do_host(char *host) | |
642 | { | |
643 | char *name = strnnsep(&host, " \t\n"); | |
644 | int j; | |
645 | ||
646 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { | |
647 | if (get_keytypes & j) { | |
648 | while (ncon >= MAXCON) | |
649 | conloop(); | |
650 | conalloc(name, *host ? host : name, j); | |
651 | } | |
652 | } | |
653 | } | |
654 | ||
655 | static void | |
656 | fatal_callback(void *arg) | |
657 | { | |
658 | if (nonfatal_fatal) | |
659 | longjmp(kexjmp, -1); | |
660 | } | |
661 | ||
662 | static void | |
663 | usage(void) | |
664 | { | |
665 | fprintf(stderr, "Usage: %s [options] host ...\n", | |
666 | __progname); | |
667 | fprintf(stderr, "Options:\n"); | |
668 | fprintf(stderr, " -f file Read hosts or addresses from file.\n"); | |
669 | fprintf(stderr, " -p port Connect to the specified port.\n"); | |
670 | fprintf(stderr, " -t keytype Specify the host key type.\n"); | |
671 | fprintf(stderr, " -T timeout Set connection timeout.\n"); | |
672 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
673 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
674 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
675 | exit(1); | |
676 | } | |
677 | ||
678 | int | |
679 | main(int argc, char **argv) | |
680 | { | |
681 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; | |
682 | int opt, fopt_count = 0; | |
683 | char *tname; | |
684 | ||
685 | extern int optind; | |
686 | extern char *optarg; | |
687 | ||
688 | __progname = get_progname(argv[0]); | |
689 | TAILQ_INIT(&tq); | |
690 | ||
691 | if (argc <= 1) | |
692 | usage(); | |
693 | ||
694 | while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) { | |
695 | switch (opt) { | |
696 | case 'p': | |
697 | ssh_port = a2port(optarg); | |
698 | if (ssh_port == 0) { | |
699 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
700 | exit(1); | |
701 | } | |
702 | break; | |
703 | case 'T': | |
704 | timeout = atoi(optarg); | |
705 | if (timeout <= 0) | |
706 | usage(); | |
707 | break; | |
708 | case 'v': | |
709 | if (!debug_flag) { | |
710 | debug_flag = 1; | |
711 | log_level = SYSLOG_LEVEL_DEBUG1; | |
712 | } | |
713 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
714 | log_level++; | |
715 | else | |
716 | fatal("Too high debugging level."); | |
717 | break; | |
718 | case 'f': | |
719 | if (strcmp(optarg, "-") == 0) | |
720 | optarg = NULL; | |
721 | argv[fopt_count++] = optarg; | |
722 | break; | |
723 | case 't': | |
724 | get_keytypes = 0; | |
725 | tname = strtok(optarg, ","); | |
726 | while (tname) { | |
727 | int type = key_type_from_name(tname); | |
728 | switch (type) { | |
729 | case KEY_RSA1: | |
730 | get_keytypes |= KT_RSA1; | |
731 | break; | |
732 | case KEY_DSA: | |
733 | get_keytypes |= KT_DSA; | |
734 | break; | |
735 | case KEY_RSA: | |
736 | get_keytypes |= KT_RSA; | |
737 | break; | |
738 | case KEY_UNSPEC: | |
739 | fatal("unknown key type %s\n", tname); | |
740 | } | |
741 | tname = strtok(NULL, ","); | |
742 | } | |
743 | break; | |
744 | case '4': | |
745 | IPv4or6 = AF_INET; | |
746 | break; | |
747 | case '6': | |
748 | IPv4or6 = AF_INET6; | |
749 | break; | |
750 | case '?': | |
751 | default: | |
752 | usage(); | |
753 | } | |
754 | } | |
755 | if (optind == argc && !fopt_count) | |
756 | usage(); | |
757 | ||
758 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); | |
759 | fatal_add_cleanup(fatal_callback, NULL); | |
760 | ||
761 | maxfd = fdlim_get(1); | |
762 | if (maxfd < 0) | |
763 | fatal("%s: fdlim_get: bad value", __progname); | |
764 | if (maxfd > MAXMAXFD) | |
765 | maxfd = MAXMAXFD; | |
766 | if (MAXCON <= 0) | |
767 | fatal("%s: not enough file descriptors", __progname); | |
768 | if (maxfd > fdlim_get(0)) | |
769 | fdlim_set(maxfd); | |
770 | fdcon = xmalloc(maxfd * sizeof(con)); | |
771 | memset(fdcon, 0, maxfd * sizeof(con)); | |
772 | ||
773 | read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask); | |
774 | read_wait = xmalloc(read_wait_size); | |
775 | memset(read_wait, 0, read_wait_size); | |
776 | ||
777 | if (fopt_count) { | |
778 | Linebuf *lb; | |
779 | char *line; | |
780 | int j; | |
781 | ||
782 | for (j = 0; j < fopt_count; j++) { | |
783 | lb = Linebuf_alloc(argv[j], error); | |
784 | if (!lb) | |
785 | continue; | |
786 | while ((line = Linebuf_getline(lb)) != NULL) | |
787 | do_host(line); | |
788 | Linebuf_free(lb); | |
789 | } | |
790 | } | |
791 | ||
792 | while (optind < argc) | |
793 | do_host(argv[optind++]); | |
794 | ||
795 | while (ncon > 0) | |
796 | conloop(); | |
797 | ||
798 | return (0); | |
799 | } |