Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.70
1.70 ! stevesk 1: /* $OpenBSD: ssh-keyscan.c,v 1.69 2006/07/22 20:48:23 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>
1.70 ! stevesk 16: #include <sys/time.h>
1.58 stevesk 17:
1.69 stevesk 18: #include <openssl/bn.h>
19:
1.1 markus 20: #include <errno.h>
1.67 stevesk 21: #include <netdb.h>
1.58 stevesk 22: #include <setjmp.h>
1.66 stevesk 23: #include <stdarg.h>
1.69 stevesk 24: #include <string.h>
1.68 stevesk 25: #include <unistd.h>
1.1 markus 26:
27: #include "xmalloc.h"
28: #include "ssh.h"
1.10 markus 29: #include "ssh1.h"
1.1 markus 30: #include "key.h"
1.26 markus 31: #include "kex.h"
32: #include "compat.h"
33: #include "myproposal.h"
34: #include "packet.h"
35: #include "dispatch.h"
1.1 markus 36: #include "buffer.h"
37: #include "bufaux.h"
1.11 markus 38: #include "log.h"
1.18 deraadt 39: #include "atomicio.h"
1.26 markus 40: #include "misc.h"
1.51 djm 41: #include "hostfile.h"
1.1 markus 42:
1.26 markus 43: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
44: Default value is AF_UNSPEC means both IPv4 and IPv6. */
45: int IPv4or6 = AF_UNSPEC;
46:
47: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 48:
1.26 markus 49: #define KT_RSA1 1
50: #define KT_DSA 2
51: #define KT_RSA 4
52:
53: int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
1.1 markus 54:
1.51 djm 55: int hash_hosts = 0; /* Hash hostname on output */
56:
1.1 markus 57: #define MAXMAXFD 256
58:
59: /* The number of seconds after which to give up on a TCP connection */
60: int timeout = 5;
61:
62: int maxfd;
1.18 deraadt 63: #define MAXCON (maxfd - 10)
1.1 markus 64:
1.3 markus 65: extern char *__progname;
1.19 millert 66: fd_set *read_wait;
1.63 djm 67: size_t read_wait_nfdset;
1.1 markus 68: int ncon;
1.26 markus 69: int nonfatal_fatal = 0;
70: jmp_buf kexjmp;
1.29 markus 71: Key *kexjmp_key;
1.1 markus 72:
73: /*
74: * Keep a connection structure for each file descriptor. The state
75: * associated with file descriptor n is held in fdcon[n].
76: */
77: typedef struct Connection {
1.6 markus 78: u_char c_status; /* State of connection on this file desc. */
1.1 markus 79: #define CS_UNUSED 0 /* File descriptor unused */
80: #define CS_CON 1 /* Waiting to connect/read greeting */
81: #define CS_SIZE 2 /* Waiting to read initial packet size */
82: #define CS_KEYS 3 /* Waiting to read public key packet */
83: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
84: int c_plen; /* Packet length field for ssh packet */
85: int c_len; /* Total bytes which must be read. */
86: int c_off; /* Length of data read so far. */
1.26 markus 87: int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
1.1 markus 88: char *c_namebase; /* Address to free for c_name and c_namelist */
89: char *c_name; /* Hostname of connection for errors */
90: char *c_namelist; /* Pointer to other possible addresses */
91: char *c_output_name; /* Hostname of connection for output */
92: char *c_data; /* Data read from this fd */
1.26 markus 93: Kex *c_kex; /* The key-exchange struct for ssh2 */
1.1 markus 94: struct timeval c_tv; /* Time at which connection gets aborted */
95: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
96: } con;
97:
98: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
99: con *fdcon;
100:
101: /*
102: * This is just a wrapper around fgets() to make it usable.
103: */
104:
105: /* Stress-test. Increase this later. */
106: #define LINEBUF_SIZE 16
107:
108: typedef struct {
109: char *buf;
1.6 markus 110: u_int size;
1.1 markus 111: int lineno;
112: const char *filename;
113: FILE *stream;
114: void (*errfun) (const char *,...);
115: } Linebuf;
116:
1.24 itojun 117: static Linebuf *
1.1 markus 118: Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
119: {
120: Linebuf *lb;
121:
122: if (!(lb = malloc(sizeof(*lb)))) {
123: if (errfun)
1.37 markus 124: (*errfun) ("linebuf (%s): malloc failed\n",
125: filename ? filename : "(stdin)");
1.1 markus 126: return (NULL);
127: }
128: if (filename) {
129: lb->filename = filename;
130: if (!(lb->stream = fopen(filename, "r"))) {
1.9 markus 131: xfree(lb);
1.1 markus 132: if (errfun)
133: (*errfun) ("%s: %s\n", filename, strerror(errno));
134: return (NULL);
135: }
136: } else {
137: lb->filename = "(stdin)";
138: lb->stream = stdin;
139: }
140:
1.62 deraadt 141: if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) {
1.1 markus 142: if (errfun)
143: (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
1.9 markus 144: xfree(lb);
1.1 markus 145: return (NULL);
146: }
147: lb->errfun = errfun;
148: lb->lineno = 0;
149: return (lb);
150: }
151:
1.24 itojun 152: static void
1.1 markus 153: Linebuf_free(Linebuf * lb)
154: {
155: fclose(lb->stream);
1.9 markus 156: xfree(lb->buf);
157: xfree(lb);
1.1 markus 158: }
159:
1.24 itojun 160: #if 0
161: static void
1.1 markus 162: Linebuf_restart(Linebuf * lb)
163: {
164: clearerr(lb->stream);
165: rewind(lb->stream);
166: lb->lineno = 0;
167: }
168:
1.24 itojun 169: static int
1.1 markus 170: Linebuf_lineno(Linebuf * lb)
171: {
172: return (lb->lineno);
173: }
1.24 itojun 174: #endif
1.1 markus 175:
1.24 itojun 176: static char *
1.14 markus 177: Linebuf_getline(Linebuf * lb)
1.1 markus 178: {
1.55 djm 179: size_t n = 0;
1.39 deraadt 180: void *p;
1.1 markus 181:
182: lb->lineno++;
183: for (;;) {
184: /* Read a line */
185: if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
186: if (ferror(lb->stream) && lb->errfun)
1.39 deraadt 187: (*lb->errfun)("%s: %s\n", lb->filename,
1.17 deraadt 188: strerror(errno));
1.1 markus 189: return (NULL);
190: }
191: n = strlen(lb->buf);
192:
193: /* Return it or an error if it fits */
194: if (n > 0 && lb->buf[n - 1] == '\n') {
195: lb->buf[n - 1] = '\0';
196: return (lb->buf);
197: }
198: if (n != lb->size - 1) {
199: if (lb->errfun)
1.39 deraadt 200: (*lb->errfun)("%s: skipping incomplete last line\n",
1.17 deraadt 201: lb->filename);
1.1 markus 202: return (NULL);
203: }
204: /* Double the buffer if we need more space */
1.39 deraadt 205: lb->size *= 2;
206: if ((p = realloc(lb->buf, lb->size)) == NULL) {
207: lb->size /= 2;
1.1 markus 208: if (lb->errfun)
1.39 deraadt 209: (*lb->errfun)("linebuf (%s): realloc failed\n",
1.17 deraadt 210: lb->filename);
1.1 markus 211: return (NULL);
212: }
1.39 deraadt 213: lb->buf = p;
1.1 markus 214: }
215: }
216:
1.24 itojun 217: static int
1.1 markus 218: fdlim_get(int hard)
219: {
220: struct rlimit rlfd;
1.17 deraadt 221:
1.1 markus 222: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
223: return (-1);
224: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 225: return sysconf(_SC_OPEN_MAX);
1.1 markus 226: else
227: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
228: }
229:
1.24 itojun 230: static int
1.1 markus 231: fdlim_set(int lim)
232: {
233: struct rlimit rlfd;
1.39 deraadt 234:
1.1 markus 235: if (lim <= 0)
236: return (-1);
237: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
238: return (-1);
239: rlfd.rlim_cur = lim;
240: if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
241: return (-1);
242: return (0);
243: }
244:
245: /*
246: * This is an strsep function that returns a null field for adjacent
247: * separators. This is the same as the 4.4BSD strsep, but different from the
248: * one in the GNU libc.
249: */
1.24 itojun 250: static char *
1.1 markus 251: xstrsep(char **str, const char *delim)
252: {
253: char *s, *e;
254:
255: if (!**str)
256: return (NULL);
257:
258: s = *str;
259: e = s + strcspn(s, delim);
260:
261: if (*e != '\0')
262: *e++ = '\0';
263: *str = e;
264:
265: return (s);
266: }
267:
268: /*
269: * Get the next non-null token (like GNU strsep). Strsep() will return a
270: * null token for two adjacent separators, so we may have to loop.
271: */
1.24 itojun 272: static char *
1.1 markus 273: strnnsep(char **stringp, char *delim)
274: {
275: char *tok;
276:
277: do {
278: tok = xstrsep(stringp, delim);
279: } while (tok && *tok == '\0');
280: return (tok);
281: }
282:
1.26 markus 283: static Key *
284: keygrab_ssh1(con *c)
1.1 markus 285: {
286: static Key *rsa;
287: static Buffer msg;
288:
289: if (rsa == NULL) {
290: buffer_init(&msg);
291: rsa = key_new(KEY_RSA1);
292: }
1.26 markus 293: buffer_append(&msg, c->c_data, c->c_plen);
294: buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
1.1 markus 295: if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
1.26 markus 296: error("%s: invalid packet type", c->c_name);
1.1 markus 297: buffer_clear(&msg);
1.26 markus 298: return NULL;
1.1 markus 299: }
300: buffer_consume(&msg, 8); /* cookie */
301:
302: /* server key */
303: (void) buffer_get_int(&msg);
304: buffer_get_bignum(&msg, rsa->rsa->e);
305: buffer_get_bignum(&msg, rsa->rsa->n);
306:
307: /* host key */
308: (void) buffer_get_int(&msg);
309: buffer_get_bignum(&msg, rsa->rsa->e);
310: buffer_get_bignum(&msg, rsa->rsa->n);
1.26 markus 311:
1.1 markus 312: buffer_clear(&msg);
313:
1.26 markus 314: return (rsa);
315: }
316:
317: static int
318: hostjump(Key *hostkey)
319: {
1.29 markus 320: kexjmp_key = hostkey;
321: longjmp(kexjmp, 1);
1.26 markus 322: }
323:
324: static int
325: ssh2_capable(int remote_major, int remote_minor)
326: {
327: switch (remote_major) {
328: case 1:
329: if (remote_minor == 99)
330: return 1;
331: break;
332: case 2:
333: return 1;
334: default:
335: break;
336: }
337: return 0;
338: }
339:
340: static Key *
341: keygrab_ssh2(con *c)
342: {
343: int j;
344:
345: packet_set_connection(c->c_fd, c->c_fd);
346: enable_compat20();
347: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
348: "ssh-dss": "ssh-rsa";
349: c->c_kex = kex_setup(myproposal);
1.41 markus 350: c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.48 djm 351: c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.41 markus 352: c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.60 djm 353: c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.26 markus 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:
1.29 markus 367: return j < 0? NULL : kexjmp_key;
1.26 markus 368: }
369:
370: static void
371: keyprint(con *c, Key *key)
372: {
1.51 djm 373: char *host = c->c_output_name ? c->c_output_name : c->c_name;
374:
1.26 markus 375: if (!key)
376: return;
1.51 djm 377: if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
378: fatal("host_hash failed");
1.26 markus 379:
1.51 djm 380: fprintf(stdout, "%s ", host);
1.26 markus 381: key_write(key, stdout);
1.1 markus 382: fputs("\n", stdout);
383: }
384:
1.24 itojun 385: static int
1.1 markus 386: tcpconnect(char *host)
387: {
388: struct addrinfo hints, *ai, *aitop;
389: char strport[NI_MAXSERV];
390: int gaierr, s = -1;
391:
1.26 markus 392: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 393: memset(&hints, 0, sizeof(hints));
1.26 markus 394: hints.ai_family = IPv4or6;
1.1 markus 395: hints.ai_socktype = SOCK_STREAM;
396: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
397: fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
398: for (ai = aitop; ai; ai = ai->ai_next) {
1.42 markus 399: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 400: if (s < 0) {
401: error("socket: %s", strerror(errno));
402: continue;
403: }
1.49 djm 404: if (set_nonblock(s) == -1)
405: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 406: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
407: errno != EINPROGRESS)
408: error("connect (`%s'): %s", host, strerror(errno));
409: else
410: break;
411: close(s);
412: s = -1;
413: }
414: freeaddrinfo(aitop);
415: return s;
416: }
417:
1.24 itojun 418: static int
1.26 markus 419: conalloc(char *iname, char *oname, int keytype)
1.1 markus 420: {
1.39 deraadt 421: char *namebase, *name, *namelist;
1.1 markus 422: int s;
423:
424: namebase = namelist = xstrdup(iname);
425:
426: do {
427: name = xstrsep(&namelist, ",");
428: if (!name) {
1.9 markus 429: xfree(namebase);
1.1 markus 430: return (-1);
431: }
432: } while ((s = tcpconnect(name)) < 0);
433:
434: if (s >= maxfd)
1.4 markus 435: fatal("conalloc: fdno %d too high", s);
1.1 markus 436: if (fdcon[s].c_status)
1.4 markus 437: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 438:
439: fdcon[s].c_fd = s;
440: fdcon[s].c_status = CS_CON;
441: fdcon[s].c_namebase = namebase;
442: fdcon[s].c_name = name;
443: fdcon[s].c_namelist = namelist;
444: fdcon[s].c_output_name = xstrdup(oname);
445: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
446: fdcon[s].c_len = 4;
447: fdcon[s].c_off = 0;
1.26 markus 448: fdcon[s].c_keytype = keytype;
1.1 markus 449: gettimeofday(&fdcon[s].c_tv, NULL);
450: fdcon[s].c_tv.tv_sec += timeout;
451: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 452: FD_SET(s, read_wait);
1.1 markus 453: ncon++;
454: return (s);
455: }
456:
1.24 itojun 457: static void
1.1 markus 458: confree(int s)
459: {
460: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 461: fatal("confree: attempt to free bad fdno %d", s);
1.18 deraadt 462: close(s);
1.9 markus 463: xfree(fdcon[s].c_namebase);
464: xfree(fdcon[s].c_output_name);
1.1 markus 465: if (fdcon[s].c_status == CS_KEYS)
1.9 markus 466: xfree(fdcon[s].c_data);
1.1 markus 467: fdcon[s].c_status = CS_UNUSED;
1.26 markus 468: fdcon[s].c_keytype = 0;
1.1 markus 469: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 470: FD_CLR(s, read_wait);
1.1 markus 471: ncon--;
472: }
473:
1.24 itojun 474: static void
1.1 markus 475: contouch(int s)
476: {
477: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
478: gettimeofday(&fdcon[s].c_tv, NULL);
479: fdcon[s].c_tv.tv_sec += timeout;
480: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
481: }
482:
1.24 itojun 483: static int
1.1 markus 484: conrecycle(int s)
485: {
1.39 deraadt 486: con *c = &fdcon[s];
1.1 markus 487: int ret;
488:
1.26 markus 489: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 490: confree(s);
491: return (ret);
492: }
493:
1.24 itojun 494: static void
1.1 markus 495: congreet(int s)
496: {
1.55 djm 497: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 498: char buf[256], *cp;
1.33 markus 499: char remote_version[sizeof buf];
1.55 djm 500: size_t bufsiz;
1.1 markus 501: con *c = &fdcon[s];
502:
1.57 djm 503: for (;;) {
504: memset(buf, '\0', sizeof(buf));
505: bufsiz = sizeof(buf);
506: cp = buf;
507: while (bufsiz-- &&
508: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
509: if (*cp == '\r')
510: *cp = '\n';
511: cp++;
512: }
513: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
514: break;
1.27 markus 515: }
1.54 avsm 516: if (n == 0) {
517: switch (errno) {
518: case EPIPE:
519: error("%s: Connection closed by remote host", c->c_name);
520: break;
521: case ECONNREFUSED:
522: break;
523: default:
1.1 markus 524: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 525: break;
526: }
1.1 markus 527: conrecycle(s);
528: return;
529: }
1.21 millert 530: if (*cp != '\n' && *cp != '\r') {
1.1 markus 531: error("%s: bad greeting", c->c_name);
532: confree(s);
533: return;
534: }
1.21 millert 535: *cp = '\0';
1.33 markus 536: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
537: &remote_major, &remote_minor, remote_version) == 3)
538: compat_datafellows(remote_version);
539: else
540: datafellows = 0;
1.26 markus 541: if (c->c_keytype != KT_RSA1) {
542: if (!ssh2_capable(remote_major, remote_minor)) {
543: debug("%s doesn't support ssh2", c->c_name);
544: confree(s);
545: return;
546: }
1.33 markus 547: } else if (remote_major != 1) {
548: debug("%s doesn't support ssh1", c->c_name);
549: confree(s);
550: return;
1.26 markus 551: }
1.27 markus 552: fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
1.26 markus 553: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
554: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
555: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 556: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 557: error("snprintf: buffer too small");
558: confree(s);
559: return;
560: }
1.55 djm 561: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 562: error("write (%s): %s", c->c_name, strerror(errno));
563: confree(s);
564: return;
565: }
1.26 markus 566: if (c->c_keytype != KT_RSA1) {
567: keyprint(c, keygrab_ssh2(c));
568: confree(s);
569: return;
570: }
1.1 markus 571: c->c_status = CS_SIZE;
572: contouch(s);
573: }
574:
1.24 itojun 575: static void
1.1 markus 576: conread(int s)
577: {
1.39 deraadt 578: con *c = &fdcon[s];
1.54 avsm 579: size_t n;
1.1 markus 580:
581: if (c->c_status == CS_CON) {
582: congreet(s);
583: return;
584: }
1.50 avsm 585: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 586: if (n == 0) {
1.1 markus 587: error("read (%s): %s", c->c_name, strerror(errno));
588: confree(s);
589: return;
590: }
591: c->c_off += n;
592:
593: if (c->c_off == c->c_len)
594: switch (c->c_status) {
595: case CS_SIZE:
596: c->c_plen = htonl(c->c_plen);
597: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
598: c->c_off = 0;
599: c->c_data = xmalloc(c->c_len);
600: c->c_status = CS_KEYS;
601: break;
602: case CS_KEYS:
1.26 markus 603: keyprint(c, keygrab_ssh1(c));
1.1 markus 604: confree(s);
605: return;
606: default:
1.4 markus 607: fatal("conread: invalid status %d", c->c_status);
1.1 markus 608: break;
609: }
610:
611: contouch(s);
612: }
613:
1.24 itojun 614: static void
1.1 markus 615: conloop(void)
616: {
1.39 deraadt 617: struct timeval seltime, now;
1.19 millert 618: fd_set *r, *e;
1.39 deraadt 619: con *c;
1.1 markus 620: int i;
621:
622: gettimeofday(&now, NULL);
1.36 itojun 623: c = TAILQ_FIRST(&tq);
1.1 markus 624:
1.18 deraadt 625: if (c && (c->c_tv.tv_sec > now.tv_sec ||
626: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 627: seltime = c->c_tv;
628: seltime.tv_sec -= now.tv_sec;
629: seltime.tv_usec -= now.tv_usec;
1.13 itojun 630: if (seltime.tv_usec < 0) {
1.1 markus 631: seltime.tv_usec += 1000000;
632: seltime.tv_sec--;
633: }
634: } else
635: seltime.tv_sec = seltime.tv_usec = 0;
636:
1.63 djm 637: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
638: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
639: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
640: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 641:
642: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 643: (errno == EAGAIN || errno == EINTR))
644: ;
645:
1.18 deraadt 646: for (i = 0; i < maxfd; i++) {
1.19 millert 647: if (FD_ISSET(i, e)) {
1.1 markus 648: error("%s: exception!", fdcon[i].c_name);
649: confree(i);
1.19 millert 650: } else if (FD_ISSET(i, r))
1.1 markus 651: conread(i);
1.18 deraadt 652: }
1.19 millert 653: xfree(r);
654: xfree(e);
1.1 markus 655:
1.36 itojun 656: c = TAILQ_FIRST(&tq);
1.18 deraadt 657: while (c && (c->c_tv.tv_sec < now.tv_sec ||
658: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 659: int s = c->c_fd;
1.18 deraadt 660:
1.36 itojun 661: c = TAILQ_NEXT(c, c_link);
1.1 markus 662: conrecycle(s);
663: }
664: }
665:
1.26 markus 666: static void
667: do_host(char *host)
1.1 markus 668: {
1.26 markus 669: char *name = strnnsep(&host, " \t\n");
670: int j;
1.1 markus 671:
1.31 markus 672: if (name == NULL)
673: return;
1.26 markus 674: for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
675: if (get_keytypes & j) {
676: while (ncon >= MAXCON)
677: conloop();
678: conalloc(name, *host ? host : name, j);
1.1 markus 679: }
680: }
681: }
682:
1.34 markus 683: void
684: fatal(const char *fmt,...)
1.26 markus 685: {
1.34 markus 686: va_list args;
1.39 deraadt 687:
1.34 markus 688: va_start(args, fmt);
689: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
690: va_end(args);
1.26 markus 691: if (nonfatal_fatal)
692: longjmp(kexjmp, -1);
1.34 markus 693: else
1.45 markus 694: exit(255);
1.26 markus 695: }
696:
697: static void
1.1 markus 698: usage(void)
699: {
1.52 jmc 700: fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.39 deraadt 701: "\t\t [host | addrlist namelist] [...]\n",
1.25 jakob 702: __progname);
703: exit(1);
1.1 markus 704: }
705:
706: int
707: main(int argc, char **argv)
708: {
1.26 markus 709: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
710: int opt, fopt_count = 0;
711: char *tname;
712:
713: extern int optind;
714: extern char *optarg;
1.1 markus 715:
716: TAILQ_INIT(&tq);
1.56 djm 717:
718: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
719: sanitise_stdfd();
1.1 markus 720:
1.26 markus 721: if (argc <= 1)
1.1 markus 722: usage();
723:
1.51 djm 724: while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
1.26 markus 725: switch (opt) {
1.51 djm 726: case 'H':
727: hash_hosts = 1;
728: break;
1.26 markus 729: case 'p':
730: ssh_port = a2port(optarg);
731: if (ssh_port == 0) {
732: fprintf(stderr, "Bad port '%s'\n", optarg);
733: exit(1);
734: }
735: break;
736: case 'T':
1.38 stevesk 737: timeout = convtime(optarg);
738: if (timeout == -1 || timeout == 0) {
739: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 740: usage();
1.38 stevesk 741: }
1.26 markus 742: break;
743: case 'v':
744: if (!debug_flag) {
745: debug_flag = 1;
746: log_level = SYSLOG_LEVEL_DEBUG1;
747: }
748: else if (log_level < SYSLOG_LEVEL_DEBUG3)
749: log_level++;
750: else
751: fatal("Too high debugging level.");
752: break;
753: case 'f':
754: if (strcmp(optarg, "-") == 0)
755: optarg = NULL;
756: argv[fopt_count++] = optarg;
757: break;
758: case 't':
759: get_keytypes = 0;
760: tname = strtok(optarg, ",");
761: while (tname) {
762: int type = key_type_from_name(tname);
763: switch (type) {
764: case KEY_RSA1:
765: get_keytypes |= KT_RSA1;
766: break;
767: case KEY_DSA:
768: get_keytypes |= KT_DSA;
769: break;
770: case KEY_RSA:
771: get_keytypes |= KT_RSA;
772: break;
773: case KEY_UNSPEC:
1.32 stevesk 774: fatal("unknown key type %s", tname);
1.26 markus 775: }
776: tname = strtok(NULL, ",");
777: }
778: break;
779: case '4':
780: IPv4or6 = AF_INET;
781: break;
782: case '6':
783: IPv4or6 = AF_INET6;
784: break;
785: case '?':
786: default:
787: usage();
1.1 markus 788: }
789: }
1.26 markus 790: if (optind == argc && !fopt_count)
1.1 markus 791: usage();
792:
1.26 markus 793: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
794:
1.1 markus 795: maxfd = fdlim_get(1);
796: if (maxfd < 0)
1.4 markus 797: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 798: if (maxfd > MAXMAXFD)
799: maxfd = MAXMAXFD;
1.18 deraadt 800: if (MAXCON <= 0)
1.4 markus 801: fatal("%s: not enough file descriptors", __progname);
1.1 markus 802: if (maxfd > fdlim_get(0))
803: fdlim_set(maxfd);
1.63 djm 804: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 805:
1.63 djm 806: read_wait_nfdset = howmany(maxfd, NFDBITS);
807: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 808:
1.26 markus 809: if (fopt_count) {
810: Linebuf *lb;
811: char *line;
812: int j;
813:
814: for (j = 0; j < fopt_count; j++) {
815: lb = Linebuf_alloc(argv[j], error);
1.28 danh 816: if (!lb)
817: continue;
1.26 markus 818: while ((line = Linebuf_getline(lb)) != NULL)
819: do_host(line);
820: Linebuf_free(lb);
821: }
822: }
823:
824: while (optind < argc)
825: do_host(argv[optind++]);
1.1 markus 826:
827: while (ncon > 0)
828: conloop();
829:
830: return (0);
831: }
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