Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.69
1.69 ! stevesk 1: /* $OpenBSD: ssh-keyscan.c,v 1.68 2006/07/17 01:31:10 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:
1.69 ! stevesk 17: #include <openssl/bn.h>
! 18:
1.1 markus 19: #include <errno.h>
1.67 stevesk 20: #include <netdb.h>
1.58 stevesk 21: #include <setjmp.h>
1.66 stevesk 22: #include <stdarg.h>
1.69 ! stevesk 23: #include <string.h>
1.68 stevesk 24: #include <unistd.h>
1.1 markus 25:
26: #include "xmalloc.h"
27: #include "ssh.h"
1.10 markus 28: #include "ssh1.h"
1.1 markus 29: #include "key.h"
1.26 markus 30: #include "kex.h"
31: #include "compat.h"
32: #include "myproposal.h"
33: #include "packet.h"
34: #include "dispatch.h"
1.1 markus 35: #include "buffer.h"
36: #include "bufaux.h"
1.11 markus 37: #include "log.h"
1.18 deraadt 38: #include "atomicio.h"
1.26 markus 39: #include "misc.h"
1.51 djm 40: #include "hostfile.h"
1.1 markus 41:
1.26 markus 42: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
43: Default value is AF_UNSPEC means both IPv4 and IPv6. */
44: int IPv4or6 = AF_UNSPEC;
45:
46: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 47:
1.26 markus 48: #define KT_RSA1 1
49: #define KT_DSA 2
50: #define KT_RSA 4
51:
52: int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
1.1 markus 53:
1.51 djm 54: int hash_hosts = 0; /* Hash hostname on output */
55:
1.1 markus 56: #define MAXMAXFD 256
57:
58: /* The number of seconds after which to give up on a TCP connection */
59: int timeout = 5;
60:
61: int maxfd;
1.18 deraadt 62: #define MAXCON (maxfd - 10)
1.1 markus 63:
1.3 markus 64: extern char *__progname;
1.19 millert 65: fd_set *read_wait;
1.63 djm 66: size_t read_wait_nfdset;
1.1 markus 67: int ncon;
1.26 markus 68: int nonfatal_fatal = 0;
69: jmp_buf kexjmp;
1.29 markus 70: Key *kexjmp_key;
1.1 markus 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 {
1.6 markus 77: u_char c_status; /* State of connection on this file desc. */
1.1 markus 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. */
1.26 markus 86: int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
1.1 markus 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 */
1.26 markus 92: Kex *c_kex; /* The key-exchange struct for ssh2 */
1.1 markus 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;
1.6 markus 109: u_int size;
1.1 markus 110: int lineno;
111: const char *filename;
112: FILE *stream;
113: void (*errfun) (const char *,...);
114: } Linebuf;
115:
1.24 itojun 116: static Linebuf *
1.1 markus 117: Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
118: {
119: Linebuf *lb;
120:
121: if (!(lb = malloc(sizeof(*lb)))) {
122: if (errfun)
1.37 markus 123: (*errfun) ("linebuf (%s): malloc failed\n",
124: filename ? filename : "(stdin)");
1.1 markus 125: return (NULL);
126: }
127: if (filename) {
128: lb->filename = filename;
129: if (!(lb->stream = fopen(filename, "r"))) {
1.9 markus 130: xfree(lb);
1.1 markus 131: if (errfun)
132: (*errfun) ("%s: %s\n", filename, strerror(errno));
133: return (NULL);
134: }
135: } else {
136: lb->filename = "(stdin)";
137: lb->stream = stdin;
138: }
139:
1.62 deraadt 140: if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) {
1.1 markus 141: if (errfun)
142: (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
1.9 markus 143: xfree(lb);
1.1 markus 144: return (NULL);
145: }
146: lb->errfun = errfun;
147: lb->lineno = 0;
148: return (lb);
149: }
150:
1.24 itojun 151: static void
1.1 markus 152: Linebuf_free(Linebuf * lb)
153: {
154: fclose(lb->stream);
1.9 markus 155: xfree(lb->buf);
156: xfree(lb);
1.1 markus 157: }
158:
1.24 itojun 159: #if 0
160: static void
1.1 markus 161: Linebuf_restart(Linebuf * lb)
162: {
163: clearerr(lb->stream);
164: rewind(lb->stream);
165: lb->lineno = 0;
166: }
167:
1.24 itojun 168: static int
1.1 markus 169: Linebuf_lineno(Linebuf * lb)
170: {
171: return (lb->lineno);
172: }
1.24 itojun 173: #endif
1.1 markus 174:
1.24 itojun 175: static char *
1.14 markus 176: Linebuf_getline(Linebuf * lb)
1.1 markus 177: {
1.55 djm 178: size_t n = 0;
1.39 deraadt 179: void *p;
1.1 markus 180:
181: lb->lineno++;
182: for (;;) {
183: /* Read a line */
184: if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
185: if (ferror(lb->stream) && lb->errfun)
1.39 deraadt 186: (*lb->errfun)("%s: %s\n", lb->filename,
1.17 deraadt 187: strerror(errno));
1.1 markus 188: return (NULL);
189: }
190: n = strlen(lb->buf);
191:
192: /* Return it or an error if it fits */
193: if (n > 0 && lb->buf[n - 1] == '\n') {
194: lb->buf[n - 1] = '\0';
195: return (lb->buf);
196: }
197: if (n != lb->size - 1) {
198: if (lb->errfun)
1.39 deraadt 199: (*lb->errfun)("%s: skipping incomplete last line\n",
1.17 deraadt 200: lb->filename);
1.1 markus 201: return (NULL);
202: }
203: /* Double the buffer if we need more space */
1.39 deraadt 204: lb->size *= 2;
205: if ((p = realloc(lb->buf, lb->size)) == NULL) {
206: lb->size /= 2;
1.1 markus 207: if (lb->errfun)
1.39 deraadt 208: (*lb->errfun)("linebuf (%s): realloc failed\n",
1.17 deraadt 209: lb->filename);
1.1 markus 210: return (NULL);
211: }
1.39 deraadt 212: lb->buf = p;
1.1 markus 213: }
214: }
215:
1.24 itojun 216: static int
1.1 markus 217: fdlim_get(int hard)
218: {
219: struct rlimit rlfd;
1.17 deraadt 220:
1.1 markus 221: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
222: return (-1);
223: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 224: return sysconf(_SC_OPEN_MAX);
1.1 markus 225: else
226: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
227: }
228:
1.24 itojun 229: static int
1.1 markus 230: fdlim_set(int lim)
231: {
232: struct rlimit rlfd;
1.39 deraadt 233:
1.1 markus 234: if (lim <= 0)
235: return (-1);
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: return (0);
242: }
243:
244: /*
245: * This is an strsep function that returns a null field for adjacent
246: * separators. This is the same as the 4.4BSD strsep, but different from the
247: * one in the GNU libc.
248: */
1.24 itojun 249: static char *
1.1 markus 250: xstrsep(char **str, const char *delim)
251: {
252: char *s, *e;
253:
254: if (!**str)
255: return (NULL);
256:
257: s = *str;
258: e = s + strcspn(s, delim);
259:
260: if (*e != '\0')
261: *e++ = '\0';
262: *str = e;
263:
264: return (s);
265: }
266:
267: /*
268: * Get the next non-null token (like GNU strsep). Strsep() will return a
269: * null token for two adjacent separators, so we may have to loop.
270: */
1.24 itojun 271: static char *
1.1 markus 272: strnnsep(char **stringp, char *delim)
273: {
274: char *tok;
275:
276: do {
277: tok = xstrsep(stringp, delim);
278: } while (tok && *tok == '\0');
279: return (tok);
280: }
281:
1.26 markus 282: static Key *
283: keygrab_ssh1(con *c)
1.1 markus 284: {
285: static Key *rsa;
286: static Buffer msg;
287:
288: if (rsa == NULL) {
289: buffer_init(&msg);
290: rsa = key_new(KEY_RSA1);
291: }
1.26 markus 292: buffer_append(&msg, c->c_data, c->c_plen);
293: buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
1.1 markus 294: if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
1.26 markus 295: error("%s: invalid packet type", c->c_name);
1.1 markus 296: buffer_clear(&msg);
1.26 markus 297: return NULL;
1.1 markus 298: }
299: buffer_consume(&msg, 8); /* cookie */
300:
301: /* server key */
302: (void) buffer_get_int(&msg);
303: buffer_get_bignum(&msg, rsa->rsa->e);
304: buffer_get_bignum(&msg, rsa->rsa->n);
305:
306: /* host key */
307: (void) buffer_get_int(&msg);
308: buffer_get_bignum(&msg, rsa->rsa->e);
309: buffer_get_bignum(&msg, rsa->rsa->n);
1.26 markus 310:
1.1 markus 311: buffer_clear(&msg);
312:
1.26 markus 313: return (rsa);
314: }
315:
316: static int
317: hostjump(Key *hostkey)
318: {
1.29 markus 319: kexjmp_key = hostkey;
320: longjmp(kexjmp, 1);
1.26 markus 321: }
322:
323: static int
324: ssh2_capable(int remote_major, int remote_minor)
325: {
326: switch (remote_major) {
327: case 1:
328: if (remote_minor == 99)
329: return 1;
330: break;
331: case 2:
332: return 1;
333: default:
334: break;
335: }
336: return 0;
337: }
338:
339: static Key *
340: keygrab_ssh2(con *c)
341: {
342: int j;
343:
344: packet_set_connection(c->c_fd, c->c_fd);
345: enable_compat20();
346: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
347: "ssh-dss": "ssh-rsa";
348: c->c_kex = kex_setup(myproposal);
1.41 markus 349: c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.48 djm 350: c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.41 markus 351: c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.60 djm 352: c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.26 markus 353: c->c_kex->verify_host_key = hostjump;
354:
355: if (!(j = setjmp(kexjmp))) {
356: nonfatal_fatal = 1;
357: dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
358: fprintf(stderr, "Impossible! dispatch_run() returned!\n");
359: exit(1);
360: }
361: nonfatal_fatal = 0;
362: xfree(c->c_kex);
363: c->c_kex = NULL;
364: packet_close();
365:
1.29 markus 366: return j < 0? NULL : kexjmp_key;
1.26 markus 367: }
368:
369: static void
370: keyprint(con *c, Key *key)
371: {
1.51 djm 372: char *host = c->c_output_name ? c->c_output_name : c->c_name;
373:
1.26 markus 374: if (!key)
375: return;
1.51 djm 376: if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
377: fatal("host_hash failed");
1.26 markus 378:
1.51 djm 379: fprintf(stdout, "%s ", host);
1.26 markus 380: key_write(key, stdout);
1.1 markus 381: fputs("\n", stdout);
382: }
383:
1.24 itojun 384: static int
1.1 markus 385: tcpconnect(char *host)
386: {
387: struct addrinfo hints, *ai, *aitop;
388: char strport[NI_MAXSERV];
389: int gaierr, s = -1;
390:
1.26 markus 391: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 392: memset(&hints, 0, sizeof(hints));
1.26 markus 393: hints.ai_family = IPv4or6;
1.1 markus 394: hints.ai_socktype = SOCK_STREAM;
395: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
396: fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
397: for (ai = aitop; ai; ai = ai->ai_next) {
1.42 markus 398: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 399: if (s < 0) {
400: error("socket: %s", strerror(errno));
401: continue;
402: }
1.49 djm 403: if (set_nonblock(s) == -1)
404: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 405: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
406: errno != EINPROGRESS)
407: error("connect (`%s'): %s", host, strerror(errno));
408: else
409: break;
410: close(s);
411: s = -1;
412: }
413: freeaddrinfo(aitop);
414: return s;
415: }
416:
1.24 itojun 417: static int
1.26 markus 418: conalloc(char *iname, char *oname, int keytype)
1.1 markus 419: {
1.39 deraadt 420: char *namebase, *name, *namelist;
1.1 markus 421: int s;
422:
423: namebase = namelist = xstrdup(iname);
424:
425: do {
426: name = xstrsep(&namelist, ",");
427: if (!name) {
1.9 markus 428: xfree(namebase);
1.1 markus 429: return (-1);
430: }
431: } while ((s = tcpconnect(name)) < 0);
432:
433: if (s >= maxfd)
1.4 markus 434: fatal("conalloc: fdno %d too high", s);
1.1 markus 435: if (fdcon[s].c_status)
1.4 markus 436: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 437:
438: fdcon[s].c_fd = s;
439: fdcon[s].c_status = CS_CON;
440: fdcon[s].c_namebase = namebase;
441: fdcon[s].c_name = name;
442: fdcon[s].c_namelist = namelist;
443: fdcon[s].c_output_name = xstrdup(oname);
444: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
445: fdcon[s].c_len = 4;
446: fdcon[s].c_off = 0;
1.26 markus 447: fdcon[s].c_keytype = keytype;
1.1 markus 448: gettimeofday(&fdcon[s].c_tv, NULL);
449: fdcon[s].c_tv.tv_sec += timeout;
450: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 451: FD_SET(s, read_wait);
1.1 markus 452: ncon++;
453: return (s);
454: }
455:
1.24 itojun 456: static void
1.1 markus 457: confree(int s)
458: {
459: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 460: fatal("confree: attempt to free bad fdno %d", s);
1.18 deraadt 461: close(s);
1.9 markus 462: xfree(fdcon[s].c_namebase);
463: xfree(fdcon[s].c_output_name);
1.1 markus 464: if (fdcon[s].c_status == CS_KEYS)
1.9 markus 465: xfree(fdcon[s].c_data);
1.1 markus 466: fdcon[s].c_status = CS_UNUSED;
1.26 markus 467: fdcon[s].c_keytype = 0;
1.1 markus 468: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 469: FD_CLR(s, read_wait);
1.1 markus 470: ncon--;
471: }
472:
1.24 itojun 473: static void
1.1 markus 474: contouch(int s)
475: {
476: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
477: gettimeofday(&fdcon[s].c_tv, NULL);
478: fdcon[s].c_tv.tv_sec += timeout;
479: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
480: }
481:
1.24 itojun 482: static int
1.1 markus 483: conrecycle(int s)
484: {
1.39 deraadt 485: con *c = &fdcon[s];
1.1 markus 486: int ret;
487:
1.26 markus 488: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 489: confree(s);
490: return (ret);
491: }
492:
1.24 itojun 493: static void
1.1 markus 494: congreet(int s)
495: {
1.55 djm 496: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 497: char buf[256], *cp;
1.33 markus 498: char remote_version[sizeof buf];
1.55 djm 499: size_t bufsiz;
1.1 markus 500: con *c = &fdcon[s];
501:
1.57 djm 502: for (;;) {
503: memset(buf, '\0', sizeof(buf));
504: bufsiz = sizeof(buf);
505: cp = buf;
506: while (bufsiz-- &&
507: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
508: if (*cp == '\r')
509: *cp = '\n';
510: cp++;
511: }
512: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
513: break;
1.27 markus 514: }
1.54 avsm 515: if (n == 0) {
516: switch (errno) {
517: case EPIPE:
518: error("%s: Connection closed by remote host", c->c_name);
519: break;
520: case ECONNREFUSED:
521: break;
522: default:
1.1 markus 523: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 524: break;
525: }
1.1 markus 526: conrecycle(s);
527: return;
528: }
1.21 millert 529: if (*cp != '\n' && *cp != '\r') {
1.1 markus 530: error("%s: bad greeting", c->c_name);
531: confree(s);
532: return;
533: }
1.21 millert 534: *cp = '\0';
1.33 markus 535: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
536: &remote_major, &remote_minor, remote_version) == 3)
537: compat_datafellows(remote_version);
538: else
539: datafellows = 0;
1.26 markus 540: if (c->c_keytype != KT_RSA1) {
541: if (!ssh2_capable(remote_major, remote_minor)) {
542: debug("%s doesn't support ssh2", c->c_name);
543: confree(s);
544: return;
545: }
1.33 markus 546: } else if (remote_major != 1) {
547: debug("%s doesn't support ssh1", c->c_name);
548: confree(s);
549: return;
1.26 markus 550: }
1.27 markus 551: fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
1.26 markus 552: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
553: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
554: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 555: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 556: error("snprintf: buffer too small");
557: confree(s);
558: return;
559: }
1.55 djm 560: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 561: error("write (%s): %s", c->c_name, strerror(errno));
562: confree(s);
563: return;
564: }
1.26 markus 565: if (c->c_keytype != KT_RSA1) {
566: keyprint(c, keygrab_ssh2(c));
567: confree(s);
568: return;
569: }
1.1 markus 570: c->c_status = CS_SIZE;
571: contouch(s);
572: }
573:
1.24 itojun 574: static void
1.1 markus 575: conread(int s)
576: {
1.39 deraadt 577: con *c = &fdcon[s];
1.54 avsm 578: size_t n;
1.1 markus 579:
580: if (c->c_status == CS_CON) {
581: congreet(s);
582: return;
583: }
1.50 avsm 584: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 585: if (n == 0) {
1.1 markus 586: error("read (%s): %s", c->c_name, strerror(errno));
587: confree(s);
588: return;
589: }
590: c->c_off += n;
591:
592: if (c->c_off == c->c_len)
593: switch (c->c_status) {
594: case CS_SIZE:
595: c->c_plen = htonl(c->c_plen);
596: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
597: c->c_off = 0;
598: c->c_data = xmalloc(c->c_len);
599: c->c_status = CS_KEYS;
600: break;
601: case CS_KEYS:
1.26 markus 602: keyprint(c, keygrab_ssh1(c));
1.1 markus 603: confree(s);
604: return;
605: default:
1.4 markus 606: fatal("conread: invalid status %d", c->c_status);
1.1 markus 607: break;
608: }
609:
610: contouch(s);
611: }
612:
1.24 itojun 613: static void
1.1 markus 614: conloop(void)
615: {
1.39 deraadt 616: struct timeval seltime, now;
1.19 millert 617: fd_set *r, *e;
1.39 deraadt 618: con *c;
1.1 markus 619: int i;
620:
621: gettimeofday(&now, NULL);
1.36 itojun 622: c = TAILQ_FIRST(&tq);
1.1 markus 623:
1.18 deraadt 624: if (c && (c->c_tv.tv_sec > now.tv_sec ||
625: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 626: seltime = c->c_tv;
627: seltime.tv_sec -= now.tv_sec;
628: seltime.tv_usec -= now.tv_usec;
1.13 itojun 629: if (seltime.tv_usec < 0) {
1.1 markus 630: seltime.tv_usec += 1000000;
631: seltime.tv_sec--;
632: }
633: } else
634: seltime.tv_sec = seltime.tv_usec = 0;
635:
1.63 djm 636: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
637: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
638: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
639: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 640:
641: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 642: (errno == EAGAIN || errno == EINTR))
643: ;
644:
1.18 deraadt 645: for (i = 0; i < maxfd; i++) {
1.19 millert 646: if (FD_ISSET(i, e)) {
1.1 markus 647: error("%s: exception!", fdcon[i].c_name);
648: confree(i);
1.19 millert 649: } else if (FD_ISSET(i, r))
1.1 markus 650: conread(i);
1.18 deraadt 651: }
1.19 millert 652: xfree(r);
653: xfree(e);
1.1 markus 654:
1.36 itojun 655: c = TAILQ_FIRST(&tq);
1.18 deraadt 656: while (c && (c->c_tv.tv_sec < now.tv_sec ||
657: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 658: int s = c->c_fd;
1.18 deraadt 659:
1.36 itojun 660: c = TAILQ_NEXT(c, c_link);
1.1 markus 661: conrecycle(s);
662: }
663: }
664:
1.26 markus 665: static void
666: do_host(char *host)
1.1 markus 667: {
1.26 markus 668: char *name = strnnsep(&host, " \t\n");
669: int j;
1.1 markus 670:
1.31 markus 671: if (name == NULL)
672: return;
1.26 markus 673: for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
674: if (get_keytypes & j) {
675: while (ncon >= MAXCON)
676: conloop();
677: conalloc(name, *host ? host : name, j);
1.1 markus 678: }
679: }
680: }
681:
1.34 markus 682: void
683: fatal(const char *fmt,...)
1.26 markus 684: {
1.34 markus 685: va_list args;
1.39 deraadt 686:
1.34 markus 687: va_start(args, fmt);
688: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
689: va_end(args);
1.26 markus 690: if (nonfatal_fatal)
691: longjmp(kexjmp, -1);
1.34 markus 692: else
1.45 markus 693: exit(255);
1.26 markus 694: }
695:
696: static void
1.1 markus 697: usage(void)
698: {
1.52 jmc 699: fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.39 deraadt 700: "\t\t [host | addrlist namelist] [...]\n",
1.25 jakob 701: __progname);
702: exit(1);
1.1 markus 703: }
704:
705: int
706: main(int argc, char **argv)
707: {
1.26 markus 708: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
709: int opt, fopt_count = 0;
710: char *tname;
711:
712: extern int optind;
713: extern char *optarg;
1.1 markus 714:
715: TAILQ_INIT(&tq);
1.56 djm 716:
717: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
718: sanitise_stdfd();
1.1 markus 719:
1.26 markus 720: if (argc <= 1)
1.1 markus 721: usage();
722:
1.51 djm 723: while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
1.26 markus 724: switch (opt) {
1.51 djm 725: case 'H':
726: hash_hosts = 1;
727: break;
1.26 markus 728: case 'p':
729: ssh_port = a2port(optarg);
730: if (ssh_port == 0) {
731: fprintf(stderr, "Bad port '%s'\n", optarg);
732: exit(1);
733: }
734: break;
735: case 'T':
1.38 stevesk 736: timeout = convtime(optarg);
737: if (timeout == -1 || timeout == 0) {
738: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 739: usage();
1.38 stevesk 740: }
1.26 markus 741: break;
742: case 'v':
743: if (!debug_flag) {
744: debug_flag = 1;
745: log_level = SYSLOG_LEVEL_DEBUG1;
746: }
747: else if (log_level < SYSLOG_LEVEL_DEBUG3)
748: log_level++;
749: else
750: fatal("Too high debugging level.");
751: break;
752: case 'f':
753: if (strcmp(optarg, "-") == 0)
754: optarg = NULL;
755: argv[fopt_count++] = optarg;
756: break;
757: case 't':
758: get_keytypes = 0;
759: tname = strtok(optarg, ",");
760: while (tname) {
761: int type = key_type_from_name(tname);
762: switch (type) {
763: case KEY_RSA1:
764: get_keytypes |= KT_RSA1;
765: break;
766: case KEY_DSA:
767: get_keytypes |= KT_DSA;
768: break;
769: case KEY_RSA:
770: get_keytypes |= KT_RSA;
771: break;
772: case KEY_UNSPEC:
1.32 stevesk 773: fatal("unknown key type %s", tname);
1.26 markus 774: }
775: tname = strtok(NULL, ",");
776: }
777: break;
778: case '4':
779: IPv4or6 = AF_INET;
780: break;
781: case '6':
782: IPv4or6 = AF_INET6;
783: break;
784: case '?':
785: default:
786: usage();
1.1 markus 787: }
788: }
1.26 markus 789: if (optind == argc && !fopt_count)
1.1 markus 790: usage();
791:
1.26 markus 792: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
793:
1.1 markus 794: maxfd = fdlim_get(1);
795: if (maxfd < 0)
1.4 markus 796: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 797: if (maxfd > MAXMAXFD)
798: maxfd = MAXMAXFD;
1.18 deraadt 799: if (MAXCON <= 0)
1.4 markus 800: fatal("%s: not enough file descriptors", __progname);
1.1 markus 801: if (maxfd > fdlim_get(0))
802: fdlim_set(maxfd);
1.63 djm 803: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 804:
1.63 djm 805: read_wait_nfdset = howmany(maxfd, NFDBITS);
806: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 807:
1.26 markus 808: if (fopt_count) {
809: Linebuf *lb;
810: char *line;
811: int j;
812:
813: for (j = 0; j < fopt_count; j++) {
814: lb = Linebuf_alloc(argv[j], error);
1.28 danh 815: if (!lb)
816: continue;
1.26 markus 817: while ((line = Linebuf_getline(lb)) != NULL)
818: do_host(line);
819: Linebuf_free(lb);
820: }
821: }
822:
823: while (optind < argc)
824: do_host(argv[optind++]);
1.1 markus 825:
826: while (ncon > 0)
827: conloop();
828:
829: return (0);
830: }
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