Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.66
1.66 ! stevesk 1: /* $OpenBSD: ssh-keyscan.c,v 1.65 2006/07/08 21:47:12 stevesk Exp $ */
1.1 markus 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
1.23 pvalchev 7: * OpenBSD project by leaving this copyright notice intact.
1.1 markus 8: */
9:
10: #include "includes.h"
11:
1.65 stevesk 12: #include <sys/types.h>
13: #include <sys/socket.h>
1.1 markus 14: #include <sys/queue.h>
1.59 stevesk 15: #include <sys/resource.h>
1.58 stevesk 16:
1.1 markus 17: #include <errno.h>
1.58 stevesk 18: #include <setjmp.h>
1.66 ! stevesk 19: #include <stdarg.h>
1.1 markus 20:
1.5 markus 21: #include <openssl/bn.h>
1.1 markus 22:
23: #include "xmalloc.h"
24: #include "ssh.h"
1.10 markus 25: #include "ssh1.h"
1.1 markus 26: #include "key.h"
1.26 markus 27: #include "kex.h"
28: #include "compat.h"
29: #include "myproposal.h"
30: #include "packet.h"
31: #include "dispatch.h"
1.1 markus 32: #include "buffer.h"
33: #include "bufaux.h"
1.11 markus 34: #include "log.h"
1.18 deraadt 35: #include "atomicio.h"
1.26 markus 36: #include "misc.h"
1.51 djm 37: #include "hostfile.h"
1.1 markus 38:
1.26 markus 39: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
40: Default value is AF_UNSPEC means both IPv4 and IPv6. */
41: int IPv4or6 = AF_UNSPEC;
42:
43: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 44:
1.26 markus 45: #define KT_RSA1 1
46: #define KT_DSA 2
47: #define KT_RSA 4
48:
49: int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
1.1 markus 50:
1.51 djm 51: int hash_hosts = 0; /* Hash hostname on output */
52:
1.1 markus 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;
1.18 deraadt 59: #define MAXCON (maxfd - 10)
1.1 markus 60:
1.3 markus 61: extern char *__progname;
1.19 millert 62: fd_set *read_wait;
1.63 djm 63: size_t read_wait_nfdset;
1.1 markus 64: int ncon;
1.26 markus 65: int nonfatal_fatal = 0;
66: jmp_buf kexjmp;
1.29 markus 67: Key *kexjmp_key;
1.1 markus 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 {
1.6 markus 74: u_char c_status; /* State of connection on this file desc. */
1.1 markus 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. */
1.26 markus 83: int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
1.1 markus 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 */
1.26 markus 89: Kex *c_kex; /* The key-exchange struct for ssh2 */
1.1 markus 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;
1.6 markus 106: u_int size;
1.1 markus 107: int lineno;
108: const char *filename;
109: FILE *stream;
110: void (*errfun) (const char *,...);
111: } Linebuf;
112:
1.24 itojun 113: static Linebuf *
1.1 markus 114: Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
115: {
116: Linebuf *lb;
117:
118: if (!(lb = malloc(sizeof(*lb)))) {
119: if (errfun)
1.37 markus 120: (*errfun) ("linebuf (%s): malloc failed\n",
121: filename ? filename : "(stdin)");
1.1 markus 122: return (NULL);
123: }
124: if (filename) {
125: lb->filename = filename;
126: if (!(lb->stream = fopen(filename, "r"))) {
1.9 markus 127: xfree(lb);
1.1 markus 128: if (errfun)
129: (*errfun) ("%s: %s\n", filename, strerror(errno));
130: return (NULL);
131: }
132: } else {
133: lb->filename = "(stdin)";
134: lb->stream = stdin;
135: }
136:
1.62 deraadt 137: if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) {
1.1 markus 138: if (errfun)
139: (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
1.9 markus 140: xfree(lb);
1.1 markus 141: return (NULL);
142: }
143: lb->errfun = errfun;
144: lb->lineno = 0;
145: return (lb);
146: }
147:
1.24 itojun 148: static void
1.1 markus 149: Linebuf_free(Linebuf * lb)
150: {
151: fclose(lb->stream);
1.9 markus 152: xfree(lb->buf);
153: xfree(lb);
1.1 markus 154: }
155:
1.24 itojun 156: #if 0
157: static void
1.1 markus 158: Linebuf_restart(Linebuf * lb)
159: {
160: clearerr(lb->stream);
161: rewind(lb->stream);
162: lb->lineno = 0;
163: }
164:
1.24 itojun 165: static int
1.1 markus 166: Linebuf_lineno(Linebuf * lb)
167: {
168: return (lb->lineno);
169: }
1.24 itojun 170: #endif
1.1 markus 171:
1.24 itojun 172: static char *
1.14 markus 173: Linebuf_getline(Linebuf * lb)
1.1 markus 174: {
1.55 djm 175: size_t n = 0;
1.39 deraadt 176: void *p;
1.1 markus 177:
178: lb->lineno++;
179: for (;;) {
180: /* Read a line */
181: if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
182: if (ferror(lb->stream) && lb->errfun)
1.39 deraadt 183: (*lb->errfun)("%s: %s\n", lb->filename,
1.17 deraadt 184: strerror(errno));
1.1 markus 185: return (NULL);
186: }
187: n = strlen(lb->buf);
188:
189: /* Return it or an error if it fits */
190: if (n > 0 && lb->buf[n - 1] == '\n') {
191: lb->buf[n - 1] = '\0';
192: return (lb->buf);
193: }
194: if (n != lb->size - 1) {
195: if (lb->errfun)
1.39 deraadt 196: (*lb->errfun)("%s: skipping incomplete last line\n",
1.17 deraadt 197: lb->filename);
1.1 markus 198: return (NULL);
199: }
200: /* Double the buffer if we need more space */
1.39 deraadt 201: lb->size *= 2;
202: if ((p = realloc(lb->buf, lb->size)) == NULL) {
203: lb->size /= 2;
1.1 markus 204: if (lb->errfun)
1.39 deraadt 205: (*lb->errfun)("linebuf (%s): realloc failed\n",
1.17 deraadt 206: lb->filename);
1.1 markus 207: return (NULL);
208: }
1.39 deraadt 209: lb->buf = p;
1.1 markus 210: }
211: }
212:
1.24 itojun 213: static int
1.1 markus 214: fdlim_get(int hard)
215: {
216: struct rlimit rlfd;
1.17 deraadt 217:
1.1 markus 218: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
219: return (-1);
220: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 221: return sysconf(_SC_OPEN_MAX);
1.1 markus 222: else
223: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
224: }
225:
1.24 itojun 226: static int
1.1 markus 227: fdlim_set(int lim)
228: {
229: struct rlimit rlfd;
1.39 deraadt 230:
1.1 markus 231: if (lim <= 0)
232: return (-1);
233: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
234: return (-1);
235: rlfd.rlim_cur = lim;
236: if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
237: return (-1);
238: return (0);
239: }
240:
241: /*
242: * This is an strsep function that returns a null field for adjacent
243: * separators. This is the same as the 4.4BSD strsep, but different from the
244: * one in the GNU libc.
245: */
1.24 itojun 246: static char *
1.1 markus 247: xstrsep(char **str, const char *delim)
248: {
249: char *s, *e;
250:
251: if (!**str)
252: return (NULL);
253:
254: s = *str;
255: e = s + strcspn(s, delim);
256:
257: if (*e != '\0')
258: *e++ = '\0';
259: *str = e;
260:
261: return (s);
262: }
263:
264: /*
265: * Get the next non-null token (like GNU strsep). Strsep() will return a
266: * null token for two adjacent separators, so we may have to loop.
267: */
1.24 itojun 268: static char *
1.1 markus 269: strnnsep(char **stringp, char *delim)
270: {
271: char *tok;
272:
273: do {
274: tok = xstrsep(stringp, delim);
275: } while (tok && *tok == '\0');
276: return (tok);
277: }
278:
1.26 markus 279: static Key *
280: keygrab_ssh1(con *c)
1.1 markus 281: {
282: static Key *rsa;
283: static Buffer msg;
284:
285: if (rsa == NULL) {
286: buffer_init(&msg);
287: rsa = key_new(KEY_RSA1);
288: }
1.26 markus 289: buffer_append(&msg, c->c_data, c->c_plen);
290: buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
1.1 markus 291: if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
1.26 markus 292: error("%s: invalid packet type", c->c_name);
1.1 markus 293: buffer_clear(&msg);
1.26 markus 294: return NULL;
1.1 markus 295: }
296: buffer_consume(&msg, 8); /* cookie */
297:
298: /* server key */
299: (void) buffer_get_int(&msg);
300: buffer_get_bignum(&msg, rsa->rsa->e);
301: buffer_get_bignum(&msg, rsa->rsa->n);
302:
303: /* host key */
304: (void) buffer_get_int(&msg);
305: buffer_get_bignum(&msg, rsa->rsa->e);
306: buffer_get_bignum(&msg, rsa->rsa->n);
1.26 markus 307:
1.1 markus 308: buffer_clear(&msg);
309:
1.26 markus 310: return (rsa);
311: }
312:
313: static int
314: hostjump(Key *hostkey)
315: {
1.29 markus 316: kexjmp_key = hostkey;
317: longjmp(kexjmp, 1);
1.26 markus 318: }
319:
320: static int
321: ssh2_capable(int remote_major, int remote_minor)
322: {
323: switch (remote_major) {
324: case 1:
325: if (remote_minor == 99)
326: return 1;
327: break;
328: case 2:
329: return 1;
330: default:
331: break;
332: }
333: return 0;
334: }
335:
336: static Key *
337: keygrab_ssh2(con *c)
338: {
339: int j;
340:
341: packet_set_connection(c->c_fd, c->c_fd);
342: enable_compat20();
343: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
344: "ssh-dss": "ssh-rsa";
345: c->c_kex = kex_setup(myproposal);
1.41 markus 346: c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.48 djm 347: c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.41 markus 348: c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.60 djm 349: c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.26 markus 350: c->c_kex->verify_host_key = hostjump;
351:
352: if (!(j = setjmp(kexjmp))) {
353: nonfatal_fatal = 1;
354: dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
355: fprintf(stderr, "Impossible! dispatch_run() returned!\n");
356: exit(1);
357: }
358: nonfatal_fatal = 0;
359: xfree(c->c_kex);
360: c->c_kex = NULL;
361: packet_close();
362:
1.29 markus 363: return j < 0? NULL : kexjmp_key;
1.26 markus 364: }
365:
366: static void
367: keyprint(con *c, Key *key)
368: {
1.51 djm 369: char *host = c->c_output_name ? c->c_output_name : c->c_name;
370:
1.26 markus 371: if (!key)
372: return;
1.51 djm 373: if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
374: fatal("host_hash failed");
1.26 markus 375:
1.51 djm 376: fprintf(stdout, "%s ", host);
1.26 markus 377: key_write(key, stdout);
1.1 markus 378: fputs("\n", stdout);
379: }
380:
1.24 itojun 381: static int
1.1 markus 382: tcpconnect(char *host)
383: {
384: struct addrinfo hints, *ai, *aitop;
385: char strport[NI_MAXSERV];
386: int gaierr, s = -1;
387:
1.26 markus 388: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 389: memset(&hints, 0, sizeof(hints));
1.26 markus 390: hints.ai_family = IPv4or6;
1.1 markus 391: hints.ai_socktype = SOCK_STREAM;
392: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
393: fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
394: for (ai = aitop; ai; ai = ai->ai_next) {
1.42 markus 395: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 396: if (s < 0) {
397: error("socket: %s", strerror(errno));
398: continue;
399: }
1.49 djm 400: if (set_nonblock(s) == -1)
401: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 402: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
403: errno != EINPROGRESS)
404: error("connect (`%s'): %s", host, strerror(errno));
405: else
406: break;
407: close(s);
408: s = -1;
409: }
410: freeaddrinfo(aitop);
411: return s;
412: }
413:
1.24 itojun 414: static int
1.26 markus 415: conalloc(char *iname, char *oname, int keytype)
1.1 markus 416: {
1.39 deraadt 417: char *namebase, *name, *namelist;
1.1 markus 418: int s;
419:
420: namebase = namelist = xstrdup(iname);
421:
422: do {
423: name = xstrsep(&namelist, ",");
424: if (!name) {
1.9 markus 425: xfree(namebase);
1.1 markus 426: return (-1);
427: }
428: } while ((s = tcpconnect(name)) < 0);
429:
430: if (s >= maxfd)
1.4 markus 431: fatal("conalloc: fdno %d too high", s);
1.1 markus 432: if (fdcon[s].c_status)
1.4 markus 433: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 434:
435: fdcon[s].c_fd = s;
436: fdcon[s].c_status = CS_CON;
437: fdcon[s].c_namebase = namebase;
438: fdcon[s].c_name = name;
439: fdcon[s].c_namelist = namelist;
440: fdcon[s].c_output_name = xstrdup(oname);
441: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
442: fdcon[s].c_len = 4;
443: fdcon[s].c_off = 0;
1.26 markus 444: fdcon[s].c_keytype = keytype;
1.1 markus 445: gettimeofday(&fdcon[s].c_tv, NULL);
446: fdcon[s].c_tv.tv_sec += timeout;
447: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 448: FD_SET(s, read_wait);
1.1 markus 449: ncon++;
450: return (s);
451: }
452:
1.24 itojun 453: static void
1.1 markus 454: confree(int s)
455: {
456: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 457: fatal("confree: attempt to free bad fdno %d", s);
1.18 deraadt 458: close(s);
1.9 markus 459: xfree(fdcon[s].c_namebase);
460: xfree(fdcon[s].c_output_name);
1.1 markus 461: if (fdcon[s].c_status == CS_KEYS)
1.9 markus 462: xfree(fdcon[s].c_data);
1.1 markus 463: fdcon[s].c_status = CS_UNUSED;
1.26 markus 464: fdcon[s].c_keytype = 0;
1.1 markus 465: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 466: FD_CLR(s, read_wait);
1.1 markus 467: ncon--;
468: }
469:
1.24 itojun 470: static void
1.1 markus 471: contouch(int s)
472: {
473: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
474: gettimeofday(&fdcon[s].c_tv, NULL);
475: fdcon[s].c_tv.tv_sec += timeout;
476: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
477: }
478:
1.24 itojun 479: static int
1.1 markus 480: conrecycle(int s)
481: {
1.39 deraadt 482: con *c = &fdcon[s];
1.1 markus 483: int ret;
484:
1.26 markus 485: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 486: confree(s);
487: return (ret);
488: }
489:
1.24 itojun 490: static void
1.1 markus 491: congreet(int s)
492: {
1.55 djm 493: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 494: char buf[256], *cp;
1.33 markus 495: char remote_version[sizeof buf];
1.55 djm 496: size_t bufsiz;
1.1 markus 497: con *c = &fdcon[s];
498:
1.57 djm 499: for (;;) {
500: memset(buf, '\0', sizeof(buf));
501: bufsiz = sizeof(buf);
502: cp = buf;
503: while (bufsiz-- &&
504: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
505: if (*cp == '\r')
506: *cp = '\n';
507: cp++;
508: }
509: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
510: break;
1.27 markus 511: }
1.54 avsm 512: if (n == 0) {
513: switch (errno) {
514: case EPIPE:
515: error("%s: Connection closed by remote host", c->c_name);
516: break;
517: case ECONNREFUSED:
518: break;
519: default:
1.1 markus 520: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 521: break;
522: }
1.1 markus 523: conrecycle(s);
524: return;
525: }
1.21 millert 526: if (*cp != '\n' && *cp != '\r') {
1.1 markus 527: error("%s: bad greeting", c->c_name);
528: confree(s);
529: return;
530: }
1.21 millert 531: *cp = '\0';
1.33 markus 532: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
533: &remote_major, &remote_minor, remote_version) == 3)
534: compat_datafellows(remote_version);
535: else
536: datafellows = 0;
1.26 markus 537: if (c->c_keytype != KT_RSA1) {
538: if (!ssh2_capable(remote_major, remote_minor)) {
539: debug("%s doesn't support ssh2", c->c_name);
540: confree(s);
541: return;
542: }
1.33 markus 543: } else if (remote_major != 1) {
544: debug("%s doesn't support ssh1", c->c_name);
545: confree(s);
546: return;
1.26 markus 547: }
1.27 markus 548: fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
1.26 markus 549: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
550: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
551: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 552: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 553: error("snprintf: buffer too small");
554: confree(s);
555: return;
556: }
1.55 djm 557: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 558: error("write (%s): %s", c->c_name, strerror(errno));
559: confree(s);
560: return;
561: }
1.26 markus 562: if (c->c_keytype != KT_RSA1) {
563: keyprint(c, keygrab_ssh2(c));
564: confree(s);
565: return;
566: }
1.1 markus 567: c->c_status = CS_SIZE;
568: contouch(s);
569: }
570:
1.24 itojun 571: static void
1.1 markus 572: conread(int s)
573: {
1.39 deraadt 574: con *c = &fdcon[s];
1.54 avsm 575: size_t n;
1.1 markus 576:
577: if (c->c_status == CS_CON) {
578: congreet(s);
579: return;
580: }
1.50 avsm 581: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 582: if (n == 0) {
1.1 markus 583: error("read (%s): %s", c->c_name, strerror(errno));
584: confree(s);
585: return;
586: }
587: c->c_off += n;
588:
589: if (c->c_off == c->c_len)
590: switch (c->c_status) {
591: case CS_SIZE:
592: c->c_plen = htonl(c->c_plen);
593: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
594: c->c_off = 0;
595: c->c_data = xmalloc(c->c_len);
596: c->c_status = CS_KEYS;
597: break;
598: case CS_KEYS:
1.26 markus 599: keyprint(c, keygrab_ssh1(c));
1.1 markus 600: confree(s);
601: return;
602: default:
1.4 markus 603: fatal("conread: invalid status %d", c->c_status);
1.1 markus 604: break;
605: }
606:
607: contouch(s);
608: }
609:
1.24 itojun 610: static void
1.1 markus 611: conloop(void)
612: {
1.39 deraadt 613: struct timeval seltime, now;
1.19 millert 614: fd_set *r, *e;
1.39 deraadt 615: con *c;
1.1 markus 616: int i;
617:
618: gettimeofday(&now, NULL);
1.36 itojun 619: c = TAILQ_FIRST(&tq);
1.1 markus 620:
1.18 deraadt 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))) {
1.1 markus 623: seltime = c->c_tv;
624: seltime.tv_sec -= now.tv_sec;
625: seltime.tv_usec -= now.tv_usec;
1.13 itojun 626: if (seltime.tv_usec < 0) {
1.1 markus 627: seltime.tv_usec += 1000000;
628: seltime.tv_sec--;
629: }
630: } else
631: seltime.tv_sec = seltime.tv_usec = 0;
632:
1.63 djm 633: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
634: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
635: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
636: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 637:
638: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 639: (errno == EAGAIN || errno == EINTR))
640: ;
641:
1.18 deraadt 642: for (i = 0; i < maxfd; i++) {
1.19 millert 643: if (FD_ISSET(i, e)) {
1.1 markus 644: error("%s: exception!", fdcon[i].c_name);
645: confree(i);
1.19 millert 646: } else if (FD_ISSET(i, r))
1.1 markus 647: conread(i);
1.18 deraadt 648: }
1.19 millert 649: xfree(r);
650: xfree(e);
1.1 markus 651:
1.36 itojun 652: c = TAILQ_FIRST(&tq);
1.18 deraadt 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))) {
1.1 markus 655: int s = c->c_fd;
1.18 deraadt 656:
1.36 itojun 657: c = TAILQ_NEXT(c, c_link);
1.1 markus 658: conrecycle(s);
659: }
660: }
661:
1.26 markus 662: static void
663: do_host(char *host)
1.1 markus 664: {
1.26 markus 665: char *name = strnnsep(&host, " \t\n");
666: int j;
1.1 markus 667:
1.31 markus 668: if (name == NULL)
669: return;
1.26 markus 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);
1.1 markus 675: }
676: }
677: }
678:
1.34 markus 679: void
680: fatal(const char *fmt,...)
1.26 markus 681: {
1.34 markus 682: va_list args;
1.39 deraadt 683:
1.34 markus 684: va_start(args, fmt);
685: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
686: va_end(args);
1.26 markus 687: if (nonfatal_fatal)
688: longjmp(kexjmp, -1);
1.34 markus 689: else
1.45 markus 690: exit(255);
1.26 markus 691: }
692:
693: static void
1.1 markus 694: usage(void)
695: {
1.52 jmc 696: fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.39 deraadt 697: "\t\t [host | addrlist namelist] [...]\n",
1.25 jakob 698: __progname);
699: exit(1);
1.1 markus 700: }
701:
702: int
703: main(int argc, char **argv)
704: {
1.26 markus 705: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
706: int opt, fopt_count = 0;
707: char *tname;
708:
709: extern int optind;
710: extern char *optarg;
1.1 markus 711:
712: TAILQ_INIT(&tq);
1.56 djm 713:
714: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
715: sanitise_stdfd();
1.1 markus 716:
1.26 markus 717: if (argc <= 1)
1.1 markus 718: usage();
719:
1.51 djm 720: while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
1.26 markus 721: switch (opt) {
1.51 djm 722: case 'H':
723: hash_hosts = 1;
724: break;
1.26 markus 725: case 'p':
726: ssh_port = a2port(optarg);
727: if (ssh_port == 0) {
728: fprintf(stderr, "Bad port '%s'\n", optarg);
729: exit(1);
730: }
731: break;
732: case 'T':
1.38 stevesk 733: timeout = convtime(optarg);
734: if (timeout == -1 || timeout == 0) {
735: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 736: usage();
1.38 stevesk 737: }
1.26 markus 738: break;
739: case 'v':
740: if (!debug_flag) {
741: debug_flag = 1;
742: log_level = SYSLOG_LEVEL_DEBUG1;
743: }
744: else if (log_level < SYSLOG_LEVEL_DEBUG3)
745: log_level++;
746: else
747: fatal("Too high debugging level.");
748: break;
749: case 'f':
750: if (strcmp(optarg, "-") == 0)
751: optarg = NULL;
752: argv[fopt_count++] = optarg;
753: break;
754: case 't':
755: get_keytypes = 0;
756: tname = strtok(optarg, ",");
757: while (tname) {
758: int type = key_type_from_name(tname);
759: switch (type) {
760: case KEY_RSA1:
761: get_keytypes |= KT_RSA1;
762: break;
763: case KEY_DSA:
764: get_keytypes |= KT_DSA;
765: break;
766: case KEY_RSA:
767: get_keytypes |= KT_RSA;
768: break;
769: case KEY_UNSPEC:
1.32 stevesk 770: fatal("unknown key type %s", tname);
1.26 markus 771: }
772: tname = strtok(NULL, ",");
773: }
774: break;
775: case '4':
776: IPv4or6 = AF_INET;
777: break;
778: case '6':
779: IPv4or6 = AF_INET6;
780: break;
781: case '?':
782: default:
783: usage();
1.1 markus 784: }
785: }
1.26 markus 786: if (optind == argc && !fopt_count)
1.1 markus 787: usage();
788:
1.26 markus 789: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
790:
1.1 markus 791: maxfd = fdlim_get(1);
792: if (maxfd < 0)
1.4 markus 793: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 794: if (maxfd > MAXMAXFD)
795: maxfd = MAXMAXFD;
1.18 deraadt 796: if (MAXCON <= 0)
1.4 markus 797: fatal("%s: not enough file descriptors", __progname);
1.1 markus 798: if (maxfd > fdlim_get(0))
799: fdlim_set(maxfd);
1.63 djm 800: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 801:
1.63 djm 802: read_wait_nfdset = howmany(maxfd, NFDBITS);
803: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 804:
1.26 markus 805: if (fopt_count) {
806: Linebuf *lb;
807: char *line;
808: int j;
809:
810: for (j = 0; j < fopt_count; j++) {
811: lb = Linebuf_alloc(argv[j], error);
1.28 danh 812: if (!lb)
813: continue;
1.26 markus 814: while ((line = Linebuf_getline(lb)) != NULL)
815: do_host(line);
816: Linebuf_free(lb);
817: }
818: }
819:
820: while (optind < argc)
821: do_host(argv[optind++]);
1.1 markus 822:
823: while (ncon > 0)
824: conloop();
825:
826: return (0);
827: }
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