Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.80
1.80 ! stevesk 1: /* $OpenBSD: ssh-keyscan.c,v 1.79 2009/10/28 16:38:18 reyk 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:
1.65 stevesk 10: #include <sys/types.h>
11: #include <sys/socket.h>
1.1 markus 12: #include <sys/queue.h>
1.74 djm 13: #include <sys/time.h>
1.59 stevesk 14: #include <sys/resource.h>
1.58 stevesk 15:
1.69 stevesk 16: #include <openssl/bn.h>
17:
1.1 markus 18: #include <errno.h>
1.67 stevesk 19: #include <netdb.h>
1.58 stevesk 20: #include <setjmp.h>
1.66 stevesk 21: #include <stdarg.h>
1.72 stevesk 22: #include <stdio.h>
1.71 stevesk 23: #include <stdlib.h>
1.73 deraadt 24: #include <signal.h>
1.69 stevesk 25: #include <string.h>
1.68 stevesk 26: #include <unistd.h>
1.1 markus 27:
28: #include "xmalloc.h"
29: #include "ssh.h"
1.10 markus 30: #include "ssh1.h"
1.73 deraadt 31: #include "buffer.h"
1.1 markus 32: #include "key.h"
1.73 deraadt 33: #include "cipher.h"
1.26 markus 34: #include "kex.h"
35: #include "compat.h"
36: #include "myproposal.h"
37: #include "packet.h"
38: #include "dispatch.h"
1.11 markus 39: #include "log.h"
1.18 deraadt 40: #include "atomicio.h"
1.26 markus 41: #include "misc.h"
1.51 djm 42: #include "hostfile.h"
1.1 markus 43:
1.26 markus 44: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
45: Default value is AF_UNSPEC means both IPv4 and IPv6. */
46: int IPv4or6 = AF_UNSPEC;
47:
48: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 49:
1.26 markus 50: #define KT_RSA1 1
51: #define KT_DSA 2
52: #define KT_RSA 4
53:
1.76 djm 54: int get_keytypes = KT_RSA; /* Get only RSA keys by default */
1.1 markus 55:
1.51 djm 56: int hash_hosts = 0; /* Hash hostname on output */
57:
1.1 markus 58: #define MAXMAXFD 256
59:
60: /* The number of seconds after which to give up on a TCP connection */
61: int timeout = 5;
62:
63: int maxfd;
1.18 deraadt 64: #define MAXCON (maxfd - 10)
1.1 markus 65:
1.79 reyk 66: /* The default routing domain */
67: int scan_rdomain = -1;
68:
1.3 markus 69: extern char *__progname;
1.19 millert 70: fd_set *read_wait;
1.63 djm 71: size_t read_wait_nfdset;
1.1 markus 72: int ncon;
1.26 markus 73: int nonfatal_fatal = 0;
74: jmp_buf kexjmp;
1.29 markus 75: Key *kexjmp_key;
1.1 markus 76:
77: /*
78: * Keep a connection structure for each file descriptor. The state
79: * associated with file descriptor n is held in fdcon[n].
80: */
81: typedef struct Connection {
1.6 markus 82: u_char c_status; /* State of connection on this file desc. */
1.1 markus 83: #define CS_UNUSED 0 /* File descriptor unused */
84: #define CS_CON 1 /* Waiting to connect/read greeting */
85: #define CS_SIZE 2 /* Waiting to read initial packet size */
86: #define CS_KEYS 3 /* Waiting to read public key packet */
87: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
88: int c_plen; /* Packet length field for ssh packet */
89: int c_len; /* Total bytes which must be read. */
90: int c_off; /* Length of data read so far. */
1.26 markus 91: int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
1.1 markus 92: char *c_namebase; /* Address to free for c_name and c_namelist */
93: char *c_name; /* Hostname of connection for errors */
94: char *c_namelist; /* Pointer to other possible addresses */
95: char *c_output_name; /* Hostname of connection for output */
96: char *c_data; /* Data read from this fd */
1.26 markus 97: Kex *c_kex; /* The key-exchange struct for ssh2 */
1.1 markus 98: struct timeval c_tv; /* Time at which connection gets aborted */
99: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
100: } con;
101:
102: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
103: con *fdcon;
104:
105: /*
106: * This is just a wrapper around fgets() to make it usable.
107: */
108:
109: /* Stress-test. Increase this later. */
110: #define LINEBUF_SIZE 16
111:
112: typedef struct {
113: char *buf;
1.6 markus 114: u_int size;
1.1 markus 115: int lineno;
116: const char *filename;
117: FILE *stream;
118: void (*errfun) (const char *,...);
119: } Linebuf;
120:
1.24 itojun 121: static Linebuf *
1.1 markus 122: Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
123: {
124: Linebuf *lb;
125:
126: if (!(lb = malloc(sizeof(*lb)))) {
127: if (errfun)
1.37 markus 128: (*errfun) ("linebuf (%s): malloc failed\n",
129: filename ? filename : "(stdin)");
1.1 markus 130: return (NULL);
131: }
132: if (filename) {
133: lb->filename = filename;
134: if (!(lb->stream = fopen(filename, "r"))) {
1.9 markus 135: xfree(lb);
1.1 markus 136: if (errfun)
137: (*errfun) ("%s: %s\n", filename, strerror(errno));
138: return (NULL);
139: }
140: } else {
141: lb->filename = "(stdin)";
142: lb->stream = stdin;
143: }
144:
1.62 deraadt 145: if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) {
1.1 markus 146: if (errfun)
147: (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
1.9 markus 148: xfree(lb);
1.1 markus 149: return (NULL);
150: }
151: lb->errfun = errfun;
152: lb->lineno = 0;
153: return (lb);
154: }
155:
1.24 itojun 156: static void
1.1 markus 157: Linebuf_free(Linebuf * lb)
158: {
159: fclose(lb->stream);
1.9 markus 160: xfree(lb->buf);
161: xfree(lb);
1.1 markus 162: }
163:
1.24 itojun 164: #if 0
165: static void
1.1 markus 166: Linebuf_restart(Linebuf * lb)
167: {
168: clearerr(lb->stream);
169: rewind(lb->stream);
170: lb->lineno = 0;
171: }
172:
1.24 itojun 173: static int
1.1 markus 174: Linebuf_lineno(Linebuf * lb)
175: {
176: return (lb->lineno);
177: }
1.24 itojun 178: #endif
1.1 markus 179:
1.24 itojun 180: static char *
1.14 markus 181: Linebuf_getline(Linebuf * lb)
1.1 markus 182: {
1.55 djm 183: size_t n = 0;
1.39 deraadt 184: void *p;
1.1 markus 185:
186: lb->lineno++;
187: for (;;) {
188: /* Read a line */
189: if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
190: if (ferror(lb->stream) && lb->errfun)
1.39 deraadt 191: (*lb->errfun)("%s: %s\n", lb->filename,
1.17 deraadt 192: strerror(errno));
1.1 markus 193: return (NULL);
194: }
195: n = strlen(lb->buf);
196:
197: /* Return it or an error if it fits */
198: if (n > 0 && lb->buf[n - 1] == '\n') {
199: lb->buf[n - 1] = '\0';
200: return (lb->buf);
201: }
202: if (n != lb->size - 1) {
203: if (lb->errfun)
1.39 deraadt 204: (*lb->errfun)("%s: skipping incomplete last line\n",
1.17 deraadt 205: lb->filename);
1.1 markus 206: return (NULL);
207: }
208: /* Double the buffer if we need more space */
1.39 deraadt 209: lb->size *= 2;
210: if ((p = realloc(lb->buf, lb->size)) == NULL) {
211: lb->size /= 2;
1.1 markus 212: if (lb->errfun)
1.39 deraadt 213: (*lb->errfun)("linebuf (%s): realloc failed\n",
1.17 deraadt 214: lb->filename);
1.1 markus 215: return (NULL);
216: }
1.39 deraadt 217: lb->buf = p;
1.1 markus 218: }
219: }
220:
1.24 itojun 221: static int
1.1 markus 222: fdlim_get(int hard)
223: {
224: struct rlimit rlfd;
1.17 deraadt 225:
1.1 markus 226: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
227: return (-1);
228: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 229: return sysconf(_SC_OPEN_MAX);
1.1 markus 230: else
231: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
232: }
233:
1.24 itojun 234: static int
1.1 markus 235: fdlim_set(int lim)
236: {
237: struct rlimit rlfd;
1.39 deraadt 238:
1.1 markus 239: if (lim <= 0)
240: return (-1);
241: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
242: return (-1);
243: rlfd.rlim_cur = lim;
244: if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
245: return (-1);
246: return (0);
247: }
248:
249: /*
250: * This is an strsep function that returns a null field for adjacent
251: * separators. This is the same as the 4.4BSD strsep, but different from the
252: * one in the GNU libc.
253: */
1.24 itojun 254: static char *
1.1 markus 255: xstrsep(char **str, const char *delim)
256: {
257: char *s, *e;
258:
259: if (!**str)
260: return (NULL);
261:
262: s = *str;
263: e = s + strcspn(s, delim);
264:
265: if (*e != '\0')
266: *e++ = '\0';
267: *str = e;
268:
269: return (s);
270: }
271:
272: /*
273: * Get the next non-null token (like GNU strsep). Strsep() will return a
274: * null token for two adjacent separators, so we may have to loop.
275: */
1.24 itojun 276: static char *
1.1 markus 277: strnnsep(char **stringp, char *delim)
278: {
279: char *tok;
280:
281: do {
282: tok = xstrsep(stringp, delim);
283: } while (tok && *tok == '\0');
284: return (tok);
285: }
286:
1.26 markus 287: static Key *
288: keygrab_ssh1(con *c)
1.1 markus 289: {
290: static Key *rsa;
291: static Buffer msg;
292:
293: if (rsa == NULL) {
294: buffer_init(&msg);
295: rsa = key_new(KEY_RSA1);
296: }
1.26 markus 297: buffer_append(&msg, c->c_data, c->c_plen);
298: buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
1.1 markus 299: if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
1.26 markus 300: error("%s: invalid packet type", c->c_name);
1.1 markus 301: buffer_clear(&msg);
1.26 markus 302: return NULL;
1.1 markus 303: }
304: buffer_consume(&msg, 8); /* cookie */
305:
306: /* server key */
307: (void) buffer_get_int(&msg);
308: buffer_get_bignum(&msg, rsa->rsa->e);
309: buffer_get_bignum(&msg, rsa->rsa->n);
310:
311: /* host key */
312: (void) buffer_get_int(&msg);
313: buffer_get_bignum(&msg, rsa->rsa->e);
314: buffer_get_bignum(&msg, rsa->rsa->n);
1.26 markus 315:
1.1 markus 316: buffer_clear(&msg);
317:
1.26 markus 318: return (rsa);
319: }
320:
321: static int
322: hostjump(Key *hostkey)
323: {
1.29 markus 324: kexjmp_key = hostkey;
325: longjmp(kexjmp, 1);
1.26 markus 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);
1.41 markus 354: c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.48 djm 355: c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.41 markus 356: c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.60 djm 357: c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.26 markus 358: c->c_kex->verify_host_key = hostjump;
359:
360: if (!(j = setjmp(kexjmp))) {
361: nonfatal_fatal = 1;
362: dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
363: fprintf(stderr, "Impossible! dispatch_run() returned!\n");
364: exit(1);
365: }
366: nonfatal_fatal = 0;
367: xfree(c->c_kex);
368: c->c_kex = NULL;
369: packet_close();
370:
1.29 markus 371: return j < 0? NULL : kexjmp_key;
1.26 markus 372: }
373:
374: static void
375: keyprint(con *c, Key *key)
376: {
1.51 djm 377: char *host = c->c_output_name ? c->c_output_name : c->c_name;
378:
1.26 markus 379: if (!key)
380: return;
1.51 djm 381: if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
382: fatal("host_hash failed");
1.26 markus 383:
1.51 djm 384: fprintf(stdout, "%s ", host);
1.26 markus 385: key_write(key, stdout);
1.1 markus 386: fputs("\n", stdout);
387: }
388:
1.24 itojun 389: static int
1.1 markus 390: tcpconnect(char *host)
391: {
392: struct addrinfo hints, *ai, *aitop;
393: char strport[NI_MAXSERV];
394: int gaierr, s = -1;
395:
1.26 markus 396: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 397: memset(&hints, 0, sizeof(hints));
1.26 markus 398: hints.ai_family = IPv4or6;
1.1 markus 399: hints.ai_socktype = SOCK_STREAM;
400: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
1.75 dtucker 401: fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
1.1 markus 402: for (ai = aitop; ai; ai = ai->ai_next) {
1.79 reyk 403: s = socket_rdomain(ai->ai_family, ai->ai_socktype,
404: ai->ai_protocol, scan_rdomain);
1.1 markus 405: if (s < 0) {
406: error("socket: %s", strerror(errno));
407: continue;
408: }
1.49 djm 409: if (set_nonblock(s) == -1)
410: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 411: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
412: errno != EINPROGRESS)
413: error("connect (`%s'): %s", host, strerror(errno));
414: else
415: break;
416: close(s);
417: s = -1;
418: }
419: freeaddrinfo(aitop);
420: return s;
421: }
422:
1.24 itojun 423: static int
1.26 markus 424: conalloc(char *iname, char *oname, int keytype)
1.1 markus 425: {
1.39 deraadt 426: char *namebase, *name, *namelist;
1.1 markus 427: int s;
428:
429: namebase = namelist = xstrdup(iname);
430:
431: do {
432: name = xstrsep(&namelist, ",");
433: if (!name) {
1.9 markus 434: xfree(namebase);
1.1 markus 435: return (-1);
436: }
437: } while ((s = tcpconnect(name)) < 0);
438:
439: if (s >= maxfd)
1.4 markus 440: fatal("conalloc: fdno %d too high", s);
1.1 markus 441: if (fdcon[s].c_status)
1.4 markus 442: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 443:
444: fdcon[s].c_fd = s;
445: fdcon[s].c_status = CS_CON;
446: fdcon[s].c_namebase = namebase;
447: fdcon[s].c_name = name;
448: fdcon[s].c_namelist = namelist;
449: fdcon[s].c_output_name = xstrdup(oname);
450: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
451: fdcon[s].c_len = 4;
452: fdcon[s].c_off = 0;
1.26 markus 453: fdcon[s].c_keytype = keytype;
1.1 markus 454: gettimeofday(&fdcon[s].c_tv, NULL);
455: fdcon[s].c_tv.tv_sec += timeout;
456: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 457: FD_SET(s, read_wait);
1.1 markus 458: ncon++;
459: return (s);
460: }
461:
1.24 itojun 462: static void
1.1 markus 463: confree(int s)
464: {
465: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 466: fatal("confree: attempt to free bad fdno %d", s);
1.18 deraadt 467: close(s);
1.9 markus 468: xfree(fdcon[s].c_namebase);
469: xfree(fdcon[s].c_output_name);
1.1 markus 470: if (fdcon[s].c_status == CS_KEYS)
1.9 markus 471: xfree(fdcon[s].c_data);
1.1 markus 472: fdcon[s].c_status = CS_UNUSED;
1.26 markus 473: fdcon[s].c_keytype = 0;
1.1 markus 474: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 475: FD_CLR(s, read_wait);
1.1 markus 476: ncon--;
477: }
478:
1.24 itojun 479: static void
1.1 markus 480: contouch(int s)
481: {
482: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
483: gettimeofday(&fdcon[s].c_tv, NULL);
484: fdcon[s].c_tv.tv_sec += timeout;
485: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
486: }
487:
1.24 itojun 488: static int
1.1 markus 489: conrecycle(int s)
490: {
1.39 deraadt 491: con *c = &fdcon[s];
1.1 markus 492: int ret;
493:
1.26 markus 494: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 495: confree(s);
496: return (ret);
497: }
498:
1.24 itojun 499: static void
1.1 markus 500: congreet(int s)
501: {
1.55 djm 502: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 503: char buf[256], *cp;
1.33 markus 504: char remote_version[sizeof buf];
1.55 djm 505: size_t bufsiz;
1.1 markus 506: con *c = &fdcon[s];
507:
1.57 djm 508: for (;;) {
509: memset(buf, '\0', sizeof(buf));
510: bufsiz = sizeof(buf);
511: cp = buf;
512: while (bufsiz-- &&
513: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
514: if (*cp == '\r')
515: *cp = '\n';
516: cp++;
517: }
518: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
519: break;
1.27 markus 520: }
1.54 avsm 521: if (n == 0) {
522: switch (errno) {
523: case EPIPE:
524: error("%s: Connection closed by remote host", c->c_name);
525: break;
526: case ECONNREFUSED:
527: break;
528: default:
1.1 markus 529: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 530: break;
531: }
1.1 markus 532: conrecycle(s);
533: return;
534: }
1.21 millert 535: if (*cp != '\n' && *cp != '\r') {
1.1 markus 536: error("%s: bad greeting", c->c_name);
537: confree(s);
538: return;
539: }
1.21 millert 540: *cp = '\0';
1.33 markus 541: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
542: &remote_major, &remote_minor, remote_version) == 3)
543: compat_datafellows(remote_version);
544: else
545: datafellows = 0;
1.26 markus 546: if (c->c_keytype != KT_RSA1) {
547: if (!ssh2_capable(remote_major, remote_minor)) {
548: debug("%s doesn't support ssh2", c->c_name);
549: confree(s);
550: return;
551: }
1.33 markus 552: } else if (remote_major != 1) {
553: debug("%s doesn't support ssh1", c->c_name);
554: confree(s);
555: return;
1.26 markus 556: }
1.27 markus 557: fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
1.26 markus 558: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
559: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
560: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 561: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 562: error("snprintf: buffer too small");
563: confree(s);
564: return;
565: }
1.55 djm 566: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 567: error("write (%s): %s", c->c_name, strerror(errno));
568: confree(s);
569: return;
570: }
1.26 markus 571: if (c->c_keytype != KT_RSA1) {
572: keyprint(c, keygrab_ssh2(c));
573: confree(s);
574: return;
575: }
1.1 markus 576: c->c_status = CS_SIZE;
577: contouch(s);
578: }
579:
1.24 itojun 580: static void
1.1 markus 581: conread(int s)
582: {
1.39 deraadt 583: con *c = &fdcon[s];
1.54 avsm 584: size_t n;
1.1 markus 585:
586: if (c->c_status == CS_CON) {
587: congreet(s);
588: return;
589: }
1.50 avsm 590: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 591: if (n == 0) {
1.1 markus 592: error("read (%s): %s", c->c_name, strerror(errno));
593: confree(s);
594: return;
595: }
596: c->c_off += n;
597:
598: if (c->c_off == c->c_len)
599: switch (c->c_status) {
600: case CS_SIZE:
601: c->c_plen = htonl(c->c_plen);
602: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
603: c->c_off = 0;
604: c->c_data = xmalloc(c->c_len);
605: c->c_status = CS_KEYS;
606: break;
607: case CS_KEYS:
1.26 markus 608: keyprint(c, keygrab_ssh1(c));
1.1 markus 609: confree(s);
610: return;
611: default:
1.4 markus 612: fatal("conread: invalid status %d", c->c_status);
1.1 markus 613: break;
614: }
615:
616: contouch(s);
617: }
618:
1.24 itojun 619: static void
1.1 markus 620: conloop(void)
621: {
1.39 deraadt 622: struct timeval seltime, now;
1.19 millert 623: fd_set *r, *e;
1.39 deraadt 624: con *c;
1.1 markus 625: int i;
626:
627: gettimeofday(&now, NULL);
1.36 itojun 628: c = TAILQ_FIRST(&tq);
1.1 markus 629:
1.18 deraadt 630: if (c && (c->c_tv.tv_sec > now.tv_sec ||
631: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 632: seltime = c->c_tv;
633: seltime.tv_sec -= now.tv_sec;
634: seltime.tv_usec -= now.tv_usec;
1.13 itojun 635: if (seltime.tv_usec < 0) {
1.1 markus 636: seltime.tv_usec += 1000000;
637: seltime.tv_sec--;
638: }
639: } else
640: seltime.tv_sec = seltime.tv_usec = 0;
641:
1.63 djm 642: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
643: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
644: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
645: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 646:
647: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 648: (errno == EAGAIN || errno == EINTR))
649: ;
650:
1.18 deraadt 651: for (i = 0; i < maxfd; i++) {
1.19 millert 652: if (FD_ISSET(i, e)) {
1.1 markus 653: error("%s: exception!", fdcon[i].c_name);
654: confree(i);
1.19 millert 655: } else if (FD_ISSET(i, r))
1.1 markus 656: conread(i);
1.18 deraadt 657: }
1.19 millert 658: xfree(r);
659: xfree(e);
1.1 markus 660:
1.36 itojun 661: c = TAILQ_FIRST(&tq);
1.18 deraadt 662: while (c && (c->c_tv.tv_sec < now.tv_sec ||
663: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 664: int s = c->c_fd;
1.18 deraadt 665:
1.36 itojun 666: c = TAILQ_NEXT(c, c_link);
1.1 markus 667: conrecycle(s);
668: }
669: }
670:
1.26 markus 671: static void
672: do_host(char *host)
1.1 markus 673: {
1.26 markus 674: char *name = strnnsep(&host, " \t\n");
675: int j;
1.1 markus 676:
1.31 markus 677: if (name == NULL)
678: return;
1.26 markus 679: for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
680: if (get_keytypes & j) {
681: while (ncon >= MAXCON)
682: conloop();
683: conalloc(name, *host ? host : name, j);
1.1 markus 684: }
685: }
686: }
687:
1.34 markus 688: void
689: fatal(const char *fmt,...)
1.26 markus 690: {
1.34 markus 691: va_list args;
1.39 deraadt 692:
1.34 markus 693: va_start(args, fmt);
694: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
695: va_end(args);
1.26 markus 696: if (nonfatal_fatal)
697: longjmp(kexjmp, -1);
1.34 markus 698: else
1.45 markus 699: exit(255);
1.26 markus 700: }
701:
702: static void
1.1 markus 703: usage(void)
704: {
1.77 sobrado 705: fprintf(stderr,
706: "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.79 reyk 707: "\t\t [-V rdomain] [host | addrlist namelist] ...\n",
1.25 jakob 708: __progname);
709: exit(1);
1.1 markus 710: }
711:
712: int
713: main(int argc, char **argv)
714: {
1.26 markus 715: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
716: int opt, fopt_count = 0;
717: char *tname;
718:
719: extern int optind;
720: extern char *optarg;
1.1 markus 721:
722: TAILQ_INIT(&tq);
1.56 djm 723:
724: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
725: sanitise_stdfd();
1.1 markus 726:
1.26 markus 727: if (argc <= 1)
1.1 markus 728: usage();
729:
1.79 reyk 730: while ((opt = getopt(argc, argv, "Hv46p:T:t:f:V:")) != -1) {
1.26 markus 731: switch (opt) {
1.51 djm 732: case 'H':
733: hash_hosts = 1;
734: break;
1.26 markus 735: case 'p':
736: ssh_port = a2port(optarg);
1.78 djm 737: if (ssh_port <= 0) {
1.26 markus 738: fprintf(stderr, "Bad port '%s'\n", optarg);
739: exit(1);
740: }
741: break;
742: case 'T':
1.38 stevesk 743: timeout = convtime(optarg);
744: if (timeout == -1 || timeout == 0) {
745: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 746: usage();
1.38 stevesk 747: }
1.26 markus 748: break;
749: case 'v':
750: if (!debug_flag) {
751: debug_flag = 1;
752: log_level = SYSLOG_LEVEL_DEBUG1;
753: }
754: else if (log_level < SYSLOG_LEVEL_DEBUG3)
755: log_level++;
756: else
757: fatal("Too high debugging level.");
758: break;
759: case 'f':
760: if (strcmp(optarg, "-") == 0)
761: optarg = NULL;
762: argv[fopt_count++] = optarg;
763: break;
764: case 't':
765: get_keytypes = 0;
766: tname = strtok(optarg, ",");
767: while (tname) {
768: int type = key_type_from_name(tname);
769: switch (type) {
770: case KEY_RSA1:
771: get_keytypes |= KT_RSA1;
772: break;
773: case KEY_DSA:
774: get_keytypes |= KT_DSA;
775: break;
776: case KEY_RSA:
777: get_keytypes |= KT_RSA;
778: break;
779: case KEY_UNSPEC:
1.32 stevesk 780: fatal("unknown key type %s", tname);
1.26 markus 781: }
782: tname = strtok(NULL, ",");
783: }
784: break;
785: case '4':
786: IPv4or6 = AF_INET;
787: break;
788: case '6':
789: IPv4or6 = AF_INET6;
1.79 reyk 790: break;
791: case 'V':
1.80 ! stevesk 792: scan_rdomain = a2rdomain(optarg);
! 793: if (scan_rdomain == -1) {
! 794: fprintf(stderr, "Bad rdomain '%s'\n", optarg);
! 795: exit(1);
! 796: }
1.26 markus 797: break;
798: case '?':
799: default:
800: usage();
1.1 markus 801: }
802: }
1.26 markus 803: if (optind == argc && !fopt_count)
1.1 markus 804: usage();
805:
1.26 markus 806: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
807:
1.1 markus 808: maxfd = fdlim_get(1);
809: if (maxfd < 0)
1.4 markus 810: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 811: if (maxfd > MAXMAXFD)
812: maxfd = MAXMAXFD;
1.18 deraadt 813: if (MAXCON <= 0)
1.4 markus 814: fatal("%s: not enough file descriptors", __progname);
1.1 markus 815: if (maxfd > fdlim_get(0))
816: fdlim_set(maxfd);
1.63 djm 817: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 818:
1.63 djm 819: read_wait_nfdset = howmany(maxfd, NFDBITS);
820: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 821:
1.26 markus 822: if (fopt_count) {
823: Linebuf *lb;
824: char *line;
825: int j;
826:
827: for (j = 0; j < fopt_count; j++) {
828: lb = Linebuf_alloc(argv[j], error);
1.28 danh 829: if (!lb)
830: continue;
1.26 markus 831: while ((line = Linebuf_getline(lb)) != NULL)
832: do_host(line);
833: Linebuf_free(lb);
834: }
835: }
836:
837: while (optind < argc)
838: do_host(argv[optind++]);
1.1 markus 839:
840: while (ncon > 0)
841: conloop();
842:
843: return (0);
844: }
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