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Commit | Line | Data |
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f6fdbddf | 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 | |
aa144206 | 6 | * OpenBSD project by leaving this copyright notice intact. |
f6fdbddf | 7 | */ |
8 | ||
9 | #include "includes.h" | |
5061072f | 10 | RCSID("$OpenBSD: ssh-keyscan.c,v 1.26 2001/08/05 23:18:20 markus Exp $"); |
f6fdbddf | 11 | |
b705bea0 | 12 | #if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H) |
f6fdbddf | 13 | #include <sys/queue.h> |
bf5f69f7 | 14 | #else |
51e2fc8f | 15 | #include "openbsd-compat/fake-queue.h" |
bf5f69f7 | 16 | #endif |
f6fdbddf | 17 | #include <errno.h> |
18 | ||
19 | #include <openssl/bn.h> | |
f6fdbddf | 20 | |
5061072f | 21 | #include <setjmp.h> |
f6fdbddf | 22 | #include "xmalloc.h" |
23 | #include "ssh.h" | |
42f11eb2 | 24 | #include "ssh1.h" |
f6fdbddf | 25 | #include "key.h" |
5061072f | 26 | #include "kex.h" |
27 | #include "compat.h" | |
28 | #include "myproposal.h" | |
29 | #include "packet.h" | |
30 | #include "dispatch.h" | |
f6fdbddf | 31 | #include "buffer.h" |
32 | #include "bufaux.h" | |
42f11eb2 | 33 | #include "log.h" |
2671b47f | 34 | #include "atomicio.h" |
5061072f | 35 | #include "misc.h" |
f6fdbddf | 36 | |
5061072f | 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 | |
f6fdbddf | 44 | |
5061072f | 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 */ | |
f6fdbddf | 52 | |
f6fdbddf | 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; | |
2671b47f | 59 | #define MAXCON (maxfd - 10) |
f6fdbddf | 60 | |
1fe6a48f | 61 | #ifdef HAVE___PROGNAME |
62 | extern char *__progname; | |
63 | #else | |
64 | char *__progname; | |
65 | #endif | |
ff7fee59 | 66 | fd_set *read_wait; |
67 | size_t read_wait_size; | |
f6fdbddf | 68 | int ncon; |
5061072f | 69 | int nonfatal_fatal = 0; |
70 | jmp_buf kexjmp; | |
f6fdbddf | 71 | |
72 | /* | |
73 | * Keep a connection structure for each file descriptor. The state | |
74 | * associated with file descriptor n is held in fdcon[n]. | |
75 | */ | |
76 | typedef struct Connection { | |
1e3b8b07 | 77 | u_char c_status; /* State of connection on this file desc. */ |
f6fdbddf | 78 | #define CS_UNUSED 0 /* File descriptor unused */ |
79 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
80 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
81 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
82 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
83 | int c_plen; /* Packet length field for ssh packet */ | |
84 | int c_len; /* Total bytes which must be read. */ | |
85 | int c_off; /* Length of data read so far. */ | |
5061072f | 86 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
f6fdbddf | 87 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
88 | char *c_name; /* Hostname of connection for errors */ | |
89 | char *c_namelist; /* Pointer to other possible addresses */ | |
90 | char *c_output_name; /* Hostname of connection for output */ | |
91 | char *c_data; /* Data read from this fd */ | |
5061072f | 92 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
f6fdbddf | 93 | struct timeval c_tv; /* Time at which connection gets aborted */ |
94 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
95 | } con; | |
96 | ||
97 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
98 | con *fdcon; | |
99 | ||
100 | /* | |
101 | * This is just a wrapper around fgets() to make it usable. | |
102 | */ | |
103 | ||
104 | /* Stress-test. Increase this later. */ | |
105 | #define LINEBUF_SIZE 16 | |
106 | ||
107 | typedef struct { | |
108 | char *buf; | |
1e3b8b07 | 109 | u_int size; |
f6fdbddf | 110 | int lineno; |
111 | const char *filename; | |
112 | FILE *stream; | |
113 | void (*errfun) (const char *,...); | |
114 | } Linebuf; | |
115 | ||
396c147e | 116 | static Linebuf * |
f6fdbddf | 117 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) |
118 | { | |
119 | Linebuf *lb; | |
120 | ||
121 | if (!(lb = malloc(sizeof(*lb)))) { | |
122 | if (errfun) | |
123 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
124 | return (NULL); | |
125 | } | |
126 | if (filename) { | |
127 | lb->filename = filename; | |
128 | if (!(lb->stream = fopen(filename, "r"))) { | |
b5c334cc | 129 | xfree(lb); |
f6fdbddf | 130 | if (errfun) |
131 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
132 | return (NULL); | |
133 | } | |
134 | } else { | |
135 | lb->filename = "(stdin)"; | |
136 | lb->stream = stdin; | |
137 | } | |
138 | ||
139 | if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) { | |
140 | if (errfun) | |
141 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
b5c334cc | 142 | xfree(lb); |
f6fdbddf | 143 | return (NULL); |
144 | } | |
145 | lb->errfun = errfun; | |
146 | lb->lineno = 0; | |
147 | return (lb); | |
148 | } | |
149 | ||
396c147e | 150 | static void |
f6fdbddf | 151 | Linebuf_free(Linebuf * lb) |
152 | { | |
153 | fclose(lb->stream); | |
b5c334cc | 154 | xfree(lb->buf); |
155 | xfree(lb); | |
f6fdbddf | 156 | } |
157 | ||
396c147e | 158 | #if 0 |
159 | static void | |
f6fdbddf | 160 | Linebuf_restart(Linebuf * lb) |
161 | { | |
162 | clearerr(lb->stream); | |
163 | rewind(lb->stream); | |
164 | lb->lineno = 0; | |
165 | } | |
166 | ||
396c147e | 167 | static int |
f6fdbddf | 168 | Linebuf_lineno(Linebuf * lb) |
169 | { | |
170 | return (lb->lineno); | |
171 | } | |
396c147e | 172 | #endif |
f6fdbddf | 173 | |
396c147e | 174 | static char * |
5be2ec5e | 175 | Linebuf_getline(Linebuf * lb) |
f6fdbddf | 176 | { |
177 | int n = 0; | |
178 | ||
179 | lb->lineno++; | |
180 | for (;;) { | |
181 | /* Read a line */ | |
182 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
183 | if (ferror(lb->stream) && lb->errfun) | |
778f6940 | 184 | (*lb->errfun) ("%s: %s\n", lb->filename, |
185 | strerror(errno)); | |
f6fdbddf | 186 | return (NULL); |
187 | } | |
188 | n = strlen(lb->buf); | |
189 | ||
190 | /* Return it or an error if it fits */ | |
191 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
192 | lb->buf[n - 1] = '\0'; | |
193 | return (lb->buf); | |
194 | } | |
195 | if (n != lb->size - 1) { | |
196 | if (lb->errfun) | |
778f6940 | 197 | (*lb->errfun) ("%s: skipping incomplete last line\n", |
198 | lb->filename); | |
f6fdbddf | 199 | return (NULL); |
200 | } | |
201 | /* Double the buffer if we need more space */ | |
202 | if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) { | |
203 | if (lb->errfun) | |
778f6940 | 204 | (*lb->errfun) ("linebuf (%s): realloc failed\n", |
205 | lb->filename); | |
f6fdbddf | 206 | return (NULL); |
207 | } | |
208 | } | |
209 | } | |
210 | ||
396c147e | 211 | static int |
f6fdbddf | 212 | fdlim_get(int hard) |
213 | { | |
f318b98b | 214 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 215 | struct rlimit rlfd; |
778f6940 | 216 | |
f6fdbddf | 217 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
218 | return (-1); | |
219 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
220 | return 10000; | |
221 | else | |
222 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
b03bd394 | 223 | #elif defined (HAVE_SYSCONF) |
224 | return sysconf (_SC_OPEN_MAX); | |
225 | #else | |
226 | return 10000; | |
227 | #endif | |
f6fdbddf | 228 | } |
229 | ||
396c147e | 230 | static int |
f6fdbddf | 231 | fdlim_set(int lim) |
232 | { | |
f318b98b | 233 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 234 | struct rlimit rlfd; |
b03bd394 | 235 | #endif |
f6fdbddf | 236 | if (lim <= 0) |
237 | return (-1); | |
f318b98b | 238 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 239 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
240 | return (-1); | |
241 | rlfd.rlim_cur = lim; | |
242 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
243 | return (-1); | |
b03bd394 | 244 | #elif defined (HAVE_SETDTABLESIZE) |
b705bea0 | 245 | setdtablesize(lim); |
b03bd394 | 246 | #endif |
f6fdbddf | 247 | return (0); |
248 | } | |
249 | ||
250 | /* | |
251 | * This is an strsep function that returns a null field for adjacent | |
252 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
253 | * one in the GNU libc. | |
254 | */ | |
396c147e | 255 | static char * |
f6fdbddf | 256 | xstrsep(char **str, const char *delim) |
257 | { | |
258 | char *s, *e; | |
259 | ||
260 | if (!**str) | |
261 | return (NULL); | |
262 | ||
263 | s = *str; | |
264 | e = s + strcspn(s, delim); | |
265 | ||
266 | if (*e != '\0') | |
267 | *e++ = '\0'; | |
268 | *str = e; | |
269 | ||
270 | return (s); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
275 | * null token for two adjacent separators, so we may have to loop. | |
276 | */ | |
396c147e | 277 | static char * |
f6fdbddf | 278 | strnnsep(char **stringp, char *delim) |
279 | { | |
280 | char *tok; | |
281 | ||
282 | do { | |
283 | tok = xstrsep(stringp, delim); | |
284 | } while (tok && *tok == '\0'); | |
285 | return (tok); | |
286 | } | |
287 | ||
5061072f | 288 | static Key * |
289 | keygrab_ssh1(con *c) | |
f6fdbddf | 290 | { |
291 | static Key *rsa; | |
292 | static Buffer msg; | |
293 | ||
294 | if (rsa == NULL) { | |
295 | buffer_init(&msg); | |
296 | rsa = key_new(KEY_RSA1); | |
297 | } | |
5061072f | 298 | buffer_append(&msg, c->c_data, c->c_plen); |
299 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
f6fdbddf | 300 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
5061072f | 301 | error("%s: invalid packet type", c->c_name); |
f6fdbddf | 302 | buffer_clear(&msg); |
5061072f | 303 | return NULL; |
f6fdbddf | 304 | } |
305 | buffer_consume(&msg, 8); /* cookie */ | |
306 | ||
307 | /* server key */ | |
308 | (void) buffer_get_int(&msg); | |
309 | buffer_get_bignum(&msg, rsa->rsa->e); | |
310 | buffer_get_bignum(&msg, rsa->rsa->n); | |
311 | ||
312 | /* host key */ | |
313 | (void) buffer_get_int(&msg); | |
314 | buffer_get_bignum(&msg, rsa->rsa->e); | |
315 | buffer_get_bignum(&msg, rsa->rsa->n); | |
5061072f | 316 | |
f6fdbddf | 317 | buffer_clear(&msg); |
318 | ||
5061072f | 319 | return (rsa); |
320 | } | |
321 | ||
322 | static int | |
323 | hostjump(Key *hostkey) | |
324 | { | |
325 | longjmp(kexjmp, (int)hostkey); | |
326 | } | |
327 | ||
328 | static int | |
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 * | |
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->verify_host_key = hostjump; | |
355 | ||
356 | if (!(j = setjmp(kexjmp))) { | |
357 | nonfatal_fatal = 1; | |
358 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
359 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
360 | exit(1); | |
361 | } | |
362 | nonfatal_fatal = 0; | |
363 | xfree(c->c_kex); | |
364 | c->c_kex = NULL; | |
365 | packet_close(); | |
366 | if (j < 0) | |
367 | j = 0; | |
368 | ||
369 | return (Key*)(j); | |
370 | } | |
371 | ||
372 | static void | |
373 | keyprint(con *c, Key *key) | |
374 | { | |
375 | if (!key) | |
376 | return; | |
377 | ||
378 | fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name); | |
379 | key_write(key, stdout); | |
f6fdbddf | 380 | fputs("\n", stdout); |
381 | } | |
382 | ||
396c147e | 383 | static int |
f6fdbddf | 384 | tcpconnect(char *host) |
385 | { | |
386 | struct addrinfo hints, *ai, *aitop; | |
387 | char strport[NI_MAXSERV]; | |
388 | int gaierr, s = -1; | |
389 | ||
5061072f | 390 | snprintf(strport, sizeof strport, "%d", ssh_port); |
f6fdbddf | 391 | memset(&hints, 0, sizeof(hints)); |
5061072f | 392 | hints.ai_family = IPv4or6; |
f6fdbddf | 393 | hints.ai_socktype = SOCK_STREAM; |
394 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
395 | fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); | |
396 | for (ai = aitop; ai; ai = ai->ai_next) { | |
397 | s = socket(ai->ai_family, SOCK_STREAM, 0); | |
398 | if (s < 0) { | |
399 | error("socket: %s", strerror(errno)); | |
400 | continue; | |
401 | } | |
eea39c02 | 402 | if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) |
f6fdbddf | 403 | fatal("F_SETFL: %s", strerror(errno)); |
404 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && | |
405 | errno != EINPROGRESS) | |
406 | error("connect (`%s'): %s", host, strerror(errno)); | |
407 | else | |
408 | break; | |
409 | close(s); | |
410 | s = -1; | |
411 | } | |
412 | freeaddrinfo(aitop); | |
413 | return s; | |
414 | } | |
415 | ||
396c147e | 416 | static int |
5061072f | 417 | conalloc(char *iname, char *oname, int keytype) |
f6fdbddf | 418 | { |
419 | int s; | |
420 | char *namebase, *name, *namelist; | |
421 | ||
422 | namebase = namelist = xstrdup(iname); | |
423 | ||
424 | do { | |
425 | name = xstrsep(&namelist, ","); | |
426 | if (!name) { | |
b5c334cc | 427 | xfree(namebase); |
f6fdbddf | 428 | return (-1); |
429 | } | |
430 | } while ((s = tcpconnect(name)) < 0); | |
431 | ||
432 | if (s >= maxfd) | |
227e8e86 | 433 | fatal("conalloc: fdno %d too high", s); |
f6fdbddf | 434 | if (fdcon[s].c_status) |
227e8e86 | 435 | fatal("conalloc: attempt to reuse fdno %d", s); |
f6fdbddf | 436 | |
437 | fdcon[s].c_fd = s; | |
438 | fdcon[s].c_status = CS_CON; | |
439 | fdcon[s].c_namebase = namebase; | |
440 | fdcon[s].c_name = name; | |
441 | fdcon[s].c_namelist = namelist; | |
442 | fdcon[s].c_output_name = xstrdup(oname); | |
443 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
444 | fdcon[s].c_len = 4; | |
445 | fdcon[s].c_off = 0; | |
5061072f | 446 | fdcon[s].c_keytype = keytype; |
f6fdbddf | 447 | gettimeofday(&fdcon[s].c_tv, NULL); |
448 | fdcon[s].c_tv.tv_sec += timeout; | |
449 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
ff7fee59 | 450 | FD_SET(s, read_wait); |
f6fdbddf | 451 | ncon++; |
452 | return (s); | |
453 | } | |
454 | ||
396c147e | 455 | static void |
f6fdbddf | 456 | confree(int s) |
457 | { | |
f6fdbddf | 458 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
227e8e86 | 459 | fatal("confree: attempt to free bad fdno %d", s); |
2671b47f | 460 | close(s); |
b5c334cc | 461 | xfree(fdcon[s].c_namebase); |
462 | xfree(fdcon[s].c_output_name); | |
f6fdbddf | 463 | if (fdcon[s].c_status == CS_KEYS) |
b5c334cc | 464 | xfree(fdcon[s].c_data); |
f6fdbddf | 465 | fdcon[s].c_status = CS_UNUSED; |
5061072f | 466 | fdcon[s].c_keytype = 0; |
f6fdbddf | 467 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
ff7fee59 | 468 | FD_CLR(s, read_wait); |
f6fdbddf | 469 | ncon--; |
470 | } | |
471 | ||
396c147e | 472 | static void |
f6fdbddf | 473 | contouch(int s) |
474 | { | |
475 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
476 | gettimeofday(&fdcon[s].c_tv, NULL); | |
477 | fdcon[s].c_tv.tv_sec += timeout; | |
478 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
479 | } | |
480 | ||
396c147e | 481 | static int |
f6fdbddf | 482 | conrecycle(int s) |
483 | { | |
484 | int ret; | |
485 | con *c = &fdcon[s]; | |
f6fdbddf | 486 | |
5061072f | 487 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
f6fdbddf | 488 | confree(s); |
f6fdbddf | 489 | return (ret); |
490 | } | |
491 | ||
396c147e | 492 | static void |
f6fdbddf | 493 | congreet(int s) |
494 | { | |
5061072f | 495 | char buf[256], *cp; |
c16c7f20 | 496 | size_t bufsiz; |
3251b439 | 497 | int n = 0; |
f6fdbddf | 498 | con *c = &fdcon[s]; |
499 | ||
c16c7f20 | 500 | bufsiz = sizeof(buf); |
501 | cp = buf; | |
502 | while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n' && *cp != '\r') | |
503 | cp++; | |
f6fdbddf | 504 | if (n < 0) { |
505 | if (errno != ECONNREFUSED) | |
506 | error("read (%s): %s", c->c_name, strerror(errno)); | |
507 | conrecycle(s); | |
508 | return; | |
509 | } | |
c16c7f20 | 510 | if (*cp != '\n' && *cp != '\r') { |
f6fdbddf | 511 | error("%s: bad greeting", c->c_name); |
512 | confree(s); | |
513 | return; | |
514 | } | |
c16c7f20 | 515 | *cp = '\0'; |
f6fdbddf | 516 | fprintf(stderr, "# %s %s\n", c->c_name, buf); |
5061072f | 517 | if (c->c_keytype != KT_RSA1) { |
518 | int remote_major, remote_minor; | |
519 | char remote_version[sizeof buf]; | |
520 | ||
521 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", | |
522 | &remote_major, &remote_minor, remote_version) == 3) | |
523 | compat_datafellows(remote_version); | |
524 | else | |
525 | datafellows = 0; | |
526 | if (!ssh2_capable(remote_major, remote_minor)) { | |
527 | debug("%s doesn't support ssh2", c->c_name); | |
528 | confree(s); | |
529 | return; | |
530 | } | |
531 | } | |
532 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", | |
533 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
534 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
2671b47f | 535 | if (atomicio(write, s, buf, n) != n) { |
f6fdbddf | 536 | error("write (%s): %s", c->c_name, strerror(errno)); |
537 | confree(s); | |
538 | return; | |
539 | } | |
5061072f | 540 | if (c->c_keytype != KT_RSA1) { |
541 | keyprint(c, keygrab_ssh2(c)); | |
542 | confree(s); | |
543 | return; | |
544 | } | |
f6fdbddf | 545 | c->c_status = CS_SIZE; |
546 | contouch(s); | |
547 | } | |
548 | ||
396c147e | 549 | static void |
f6fdbddf | 550 | conread(int s) |
551 | { | |
552 | int n; | |
553 | con *c = &fdcon[s]; | |
554 | ||
555 | if (c->c_status == CS_CON) { | |
556 | congreet(s); | |
557 | return; | |
558 | } | |
559 | n = read(s, c->c_data + c->c_off, c->c_len - c->c_off); | |
560 | if (n < 0) { | |
561 | error("read (%s): %s", c->c_name, strerror(errno)); | |
562 | confree(s); | |
563 | return; | |
564 | } | |
565 | c->c_off += n; | |
566 | ||
567 | if (c->c_off == c->c_len) | |
568 | switch (c->c_status) { | |
569 | case CS_SIZE: | |
570 | c->c_plen = htonl(c->c_plen); | |
571 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
572 | c->c_off = 0; | |
573 | c->c_data = xmalloc(c->c_len); | |
574 | c->c_status = CS_KEYS; | |
575 | break; | |
576 | case CS_KEYS: | |
5061072f | 577 | keyprint(c, keygrab_ssh1(c)); |
f6fdbddf | 578 | confree(s); |
579 | return; | |
580 | break; | |
581 | default: | |
227e8e86 | 582 | fatal("conread: invalid status %d", c->c_status); |
f6fdbddf | 583 | break; |
584 | } | |
585 | ||
586 | contouch(s); | |
587 | } | |
588 | ||
396c147e | 589 | static void |
f6fdbddf | 590 | conloop(void) |
591 | { | |
ff7fee59 | 592 | fd_set *r, *e; |
f6fdbddf | 593 | struct timeval seltime, now; |
594 | int i; | |
595 | con *c; | |
596 | ||
597 | gettimeofday(&now, NULL); | |
598 | c = tq.tqh_first; | |
599 | ||
2671b47f | 600 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
601 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
f6fdbddf | 602 | seltime = c->c_tv; |
603 | seltime.tv_sec -= now.tv_sec; | |
604 | seltime.tv_usec -= now.tv_usec; | |
5be2ec5e | 605 | if (seltime.tv_usec < 0) { |
f6fdbddf | 606 | seltime.tv_usec += 1000000; |
607 | seltime.tv_sec--; | |
608 | } | |
609 | } else | |
610 | seltime.tv_sec = seltime.tv_usec = 0; | |
611 | ||
ff7fee59 | 612 | r = xmalloc(read_wait_size); |
613 | memcpy(r, read_wait, read_wait_size); | |
614 | e = xmalloc(read_wait_size); | |
615 | memcpy(e, read_wait, read_wait_size); | |
616 | ||
617 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
fd193ca4 | 618 | (errno == EAGAIN || errno == EINTR)) |
619 | ; | |
620 | ||
2671b47f | 621 | for (i = 0; i < maxfd; i++) { |
ff7fee59 | 622 | if (FD_ISSET(i, e)) { |
f6fdbddf | 623 | error("%s: exception!", fdcon[i].c_name); |
624 | confree(i); | |
ff7fee59 | 625 | } else if (FD_ISSET(i, r)) |
f6fdbddf | 626 | conread(i); |
2671b47f | 627 | } |
ff7fee59 | 628 | xfree(r); |
629 | xfree(e); | |
f6fdbddf | 630 | |
631 | c = tq.tqh_first; | |
2671b47f | 632 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
633 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
f6fdbddf | 634 | int s = c->c_fd; |
2671b47f | 635 | |
f6fdbddf | 636 | c = c->c_link.tqe_next; |
637 | conrecycle(s); | |
638 | } | |
639 | } | |
640 | ||
5061072f | 641 | static void |
642 | do_host(char *host) | |
f6fdbddf | 643 | { |
5061072f | 644 | char *name = strnnsep(&host, " \t\n"); |
645 | int j; | |
646 | ||
647 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { | |
648 | if (get_keytypes & j) { | |
649 | while (ncon >= MAXCON) | |
650 | conloop(); | |
651 | conalloc(name, *host ? host : name, j); | |
f6fdbddf | 652 | } |
653 | } | |
654 | } | |
655 | ||
5061072f | 656 | static void |
657 | fatal_callback(void *arg) | |
658 | { | |
659 | if (nonfatal_fatal) | |
660 | longjmp(kexjmp, -1); | |
661 | } | |
662 | ||
396c147e | 663 | static void |
f6fdbddf | 664 | usage(void) |
665 | { | |
5061072f | 666 | fprintf(stderr, "Usage: %s [options] host ...\n", |
33e766d2 | 667 | __progname); |
668 | fprintf(stderr, "Options:\n"); | |
33e766d2 | 669 | fprintf(stderr, " -f file Read hosts or addresses from file.\n"); |
5061072f | 670 | fprintf(stderr, " -p port Connect to the specified port.\n"); |
671 | fprintf(stderr, " -t keytype Specify the host key type.\n"); | |
672 | fprintf(stderr, " -T timeout Set connection timeout.\n"); | |
673 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
674 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
675 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
33e766d2 | 676 | exit(1); |
f6fdbddf | 677 | } |
678 | ||
679 | int | |
680 | main(int argc, char **argv) | |
681 | { | |
5061072f | 682 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
683 | int opt, fopt_count = 0; | |
684 | char *tname; | |
685 | ||
686 | extern int optind; | |
687 | extern char *optarg; | |
f6fdbddf | 688 | |
1fe6a48f | 689 | __progname = get_progname(argv[0]); |
f6fdbddf | 690 | TAILQ_INIT(&tq); |
691 | ||
5061072f | 692 | if (argc <= 1) |
f6fdbddf | 693 | usage(); |
694 | ||
5061072f | 695 | while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) { |
696 | switch (opt) { | |
697 | case 'p': | |
698 | ssh_port = a2port(optarg); | |
699 | if (ssh_port == 0) { | |
700 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
701 | exit(1); | |
702 | } | |
703 | break; | |
704 | case 'T': | |
705 | timeout = atoi(optarg); | |
706 | if (timeout <= 0) | |
f6fdbddf | 707 | usage(); |
5061072f | 708 | break; |
709 | case 'v': | |
710 | if (!debug_flag) { | |
711 | debug_flag = 1; | |
712 | log_level = SYSLOG_LEVEL_DEBUG1; | |
713 | } | |
714 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
715 | log_level++; | |
716 | else | |
717 | fatal("Too high debugging level."); | |
718 | break; | |
719 | case 'f': | |
720 | if (strcmp(optarg, "-") == 0) | |
721 | optarg = NULL; | |
722 | argv[fopt_count++] = optarg; | |
723 | break; | |
724 | case 't': | |
725 | get_keytypes = 0; | |
726 | tname = strtok(optarg, ","); | |
727 | while (tname) { | |
728 | int type = key_type_from_name(tname); | |
729 | switch (type) { | |
730 | case KEY_RSA1: | |
731 | get_keytypes |= KT_RSA1; | |
732 | break; | |
733 | case KEY_DSA: | |
734 | get_keytypes |= KT_DSA; | |
735 | break; | |
736 | case KEY_RSA: | |
737 | get_keytypes |= KT_RSA; | |
738 | break; | |
739 | case KEY_UNSPEC: | |
740 | fatal("unknown key type %s\n", tname); | |
741 | } | |
742 | tname = strtok(NULL, ","); | |
743 | } | |
744 | break; | |
745 | case '4': | |
746 | IPv4or6 = AF_INET; | |
747 | break; | |
748 | case '6': | |
749 | IPv4or6 = AF_INET6; | |
750 | break; | |
751 | case '?': | |
752 | default: | |
f6fdbddf | 753 | usage(); |
5061072f | 754 | } |
f6fdbddf | 755 | } |
5061072f | 756 | if (optind == argc && !fopt_count) |
f6fdbddf | 757 | usage(); |
758 | ||
5061072f | 759 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
760 | fatal_add_cleanup(fatal_callback, NULL); | |
761 | ||
762 | ||
f6fdbddf | 763 | maxfd = fdlim_get(1); |
764 | if (maxfd < 0) | |
227e8e86 | 765 | fatal("%s: fdlim_get: bad value", __progname); |
f6fdbddf | 766 | if (maxfd > MAXMAXFD) |
767 | maxfd = MAXMAXFD; | |
2671b47f | 768 | if (MAXCON <= 0) |
227e8e86 | 769 | fatal("%s: not enough file descriptors", __progname); |
f6fdbddf | 770 | if (maxfd > fdlim_get(0)) |
771 | fdlim_set(maxfd); | |
772 | fdcon = xmalloc(maxfd * sizeof(con)); | |
5be2ec5e | 773 | memset(fdcon, 0, maxfd * sizeof(con)); |
f6fdbddf | 774 | |
ff7fee59 | 775 | read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask); |
776 | read_wait = xmalloc(read_wait_size); | |
777 | memset(read_wait, 0, read_wait_size); | |
778 | ||
5061072f | 779 | if (fopt_count) { |
780 | Linebuf *lb; | |
781 | char *line; | |
782 | int j; | |
783 | ||
784 | for (j = 0; j < fopt_count; j++) { | |
785 | lb = Linebuf_alloc(argv[j], error); | |
786 | while ((line = Linebuf_getline(lb)) != NULL) | |
787 | do_host(line); | |
788 | Linebuf_free(lb); | |
f6fdbddf | 789 | } |
5061072f | 790 | } |
791 | ||
792 | while (optind < argc) | |
793 | do_host(argv[optind++]); | |
794 | ||
f6fdbddf | 795 | while (ncon > 0) |
796 | conloop(); | |
797 | ||
798 | return (0); | |
799 | } |