1 /* $OpenBSD: ssh-keyscan.c,v 1.85 2011/03/15 10:36:02 okan Exp $ */
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
7 * OpenBSD project by leaving this copyright notice intact.
8 */
9
10 #include "includes.h"
11
12 #include "openbsd-compat/sys-queue.h"
13 #include <sys/resource.h>
14 #ifdef HAVE_SYS_TIME_H
15 # include <sys/time.h>
16 #endif
17
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
20
21 #include <openssl/bn.h>
22
23 #include <netdb.h>
24 #include <errno.h>
25 #include <setjmp.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <signal.h>
30 #include <string.h>
31 #include <unistd.h>
32
33 #include "xmalloc.h"
34 #include "ssh.h"
35 #include "ssh1.h"
36 #include "buffer.h"
37 #include "key.h"
38 #include "cipher.h"
39 #include "kex.h"
40 #include "compat.h"
41 #include "myproposal.h"
42 #include "packet.h"
43 #include "dispatch.h"
44 #include "log.h"
45 #include "atomicio.h"
46 #include "misc.h"
47 #include "hostfile.h"
48
49 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
50 Default value is AF_UNSPEC means both IPv4 and IPv6. */
51 int IPv4or6 = AF_UNSPEC;
52
53 int ssh_port = SSH_DEFAULT_PORT;
54
55 #define KT_RSA1 1
56 #define KT_DSA 2
57 #define KT_RSA 4
58 #define KT_ECDSA 8
59
60 int get_keytypes = KT_RSA; /* Get only RSA keys by default */
61
62 int hash_hosts = 0; /* Hash hostname on output */
63
64 #define MAXMAXFD 256
65
66 /* The number of seconds after which to give up on a TCP connection */
67 int timeout = 5;
68
69 int maxfd;
70 #define MAXCON (maxfd - 10)
71
72 extern char *__progname;
73 fd_set *read_wait;
74 size_t read_wait_nfdset;
75 int ncon;
76 int nonfatal_fatal = 0;
77 jmp_buf kexjmp;
78 Key *kexjmp_key;
79
80 /*
81 * Keep a connection structure for each file descriptor. The state
82 * associated with file descriptor n is held in fdcon[n].
83 */
84 typedef struct Connection {
85 u_char c_status; /* State of connection on this file desc. */
86 #define CS_UNUSED 0 /* File descriptor unused */
87 #define CS_CON 1 /* Waiting to connect/read greeting */
88 #define CS_SIZE 2 /* Waiting to read initial packet size */
89 #define CS_KEYS 3 /* Waiting to read public key packet */
90 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
91 int c_plen; /* Packet length field for ssh packet */
92 int c_len; /* Total bytes which must be read. */
93 int c_off; /* Length of data read so far. */
94 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
95 char *c_namebase; /* Address to free for c_name and c_namelist */
96 char *c_name; /* Hostname of connection for errors */
97 char *c_namelist; /* Pointer to other possible addresses */
98 char *c_output_name; /* Hostname of connection for output */
99 char *c_data; /* Data read from this fd */
100 Kex *c_kex; /* The key-exchange struct for ssh2 */
101 struct timeval c_tv; /* Time at which connection gets aborted */
102 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
103 } con;
104
105 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
106 con *fdcon;
107
108 static int
fdlim_get(int hard)109 fdlim_get(int hard)
110 {
111 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
112 struct rlimit rlfd;
113
114 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
115 return (-1);
116 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
117 return SSH_SYSFDMAX;
118 else
119 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
120 #else
121 return SSH_SYSFDMAX;
122 #endif
123 }
124
125 static int
fdlim_set(int lim)126 fdlim_set(int lim)
127 {
128 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
129 struct rlimit rlfd;
130 #endif
131
132 if (lim <= 0)
133 return (-1);
134 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
135 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
136 return (-1);
137 rlfd.rlim_cur = lim;
138 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
139 return (-1);
140 #elif defined (HAVE_SETDTABLESIZE)
141 setdtablesize(lim);
142 #endif
143 return (0);
144 }
145
146 /*
147 * This is an strsep function that returns a null field for adjacent
148 * separators. This is the same as the 4.4BSD strsep, but different from the
149 * one in the GNU libc.
150 */
151 static char *
xstrsep(char ** str,const char * delim)152 xstrsep(char **str, const char *delim)
153 {
154 char *s, *e;
155
156 if (!**str)
157 return (NULL);
158
159 s = *str;
160 e = s + strcspn(s, delim);
161
162 if (*e != '\0')
163 *e++ = '\0';
164 *str = e;
165
166 return (s);
167 }
168
169 /*
170 * Get the next non-null token (like GNU strsep). Strsep() will return a
171 * null token for two adjacent separators, so we may have to loop.
172 */
173 static char *
strnnsep(char ** stringp,char * delim)174 strnnsep(char **stringp, char *delim)
175 {
176 char *tok;
177
178 do {
179 tok = xstrsep(stringp, delim);
180 } while (tok && *tok == '\0');
181 return (tok);
182 }
183
184 static Key *
keygrab_ssh1(con * c)185 keygrab_ssh1(con *c)
186 {
187 static Key *rsa;
188 static Buffer msg;
189
190 if (rsa == NULL) {
191 buffer_init(&msg);
192 rsa = key_new(KEY_RSA1);
193 }
194 buffer_append(&msg, c->c_data, c->c_plen);
195 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
196 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
197 error("%s: invalid packet type", c->c_name);
198 buffer_clear(&msg);
199 return NULL;
200 }
201 buffer_consume(&msg, 8); /* cookie */
202
203 /* server key */
204 (void) buffer_get_int(&msg);
205 buffer_get_bignum(&msg, rsa->rsa->e);
206 buffer_get_bignum(&msg, rsa->rsa->n);
207
208 /* host key */
209 (void) buffer_get_int(&msg);
210 buffer_get_bignum(&msg, rsa->rsa->e);
211 buffer_get_bignum(&msg, rsa->rsa->n);
212
213 buffer_clear(&msg);
214
215 return (rsa);
216 }
217
218 static int
hostjump(Key * hostkey)219 hostjump(Key *hostkey)
220 {
221 kexjmp_key = hostkey;
222 longjmp(kexjmp, 1);
223 }
224
225 static int
ssh2_capable(int remote_major,int remote_minor)226 ssh2_capable(int remote_major, int remote_minor)
227 {
228 switch (remote_major) {
229 case 1:
230 if (remote_minor == 99)
231 return 1;
232 break;
233 case 2:
234 return 1;
235 default:
236 break;
237 }
238 return 0;
239 }
240
241 static Key *
keygrab_ssh2(con * c)242 keygrab_ssh2(con *c)
243 {
244 int j;
245
246 packet_set_connection(c->c_fd, c->c_fd);
247 enable_compat20();
248 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
249 "ssh-dss" : (c->c_keytype == KT_RSA ? "ssh-rsa" :
250 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521");
251 c->c_kex = kex_setup(myproposal);
252 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
253 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
254 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
255 c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
256 c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
257 c->c_kex->verify_host_key = hostjump;
258
259 if (!(j = setjmp(kexjmp))) {
260 nonfatal_fatal = 1;
261 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
262 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
263 exit(1);
264 }
265 nonfatal_fatal = 0;
266 xfree(c->c_kex);
267 c->c_kex = NULL;
268 packet_close();
269
270 return j < 0? NULL : kexjmp_key;
271 }
272
273 static void
keyprint(con * c,Key * key)274 keyprint(con *c, Key *key)
275 {
276 char *host = c->c_output_name ? c->c_output_name : c->c_name;
277
278 if (!key)
279 return;
280 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
281 fatal("host_hash failed");
282
283 fprintf(stdout, "%s ", host);
284 key_write(key, stdout);
285 fputs("\n", stdout);
286 }
287
288 static int
tcpconnect(char * host)289 tcpconnect(char *host)
290 {
291 struct addrinfo hints, *ai, *aitop;
292 char strport[NI_MAXSERV];
293 int gaierr, s = -1;
294
295 snprintf(strport, sizeof strport, "%d", ssh_port);
296 memset(&hints, 0, sizeof(hints));
297 hints.ai_family = IPv4or6;
298 hints.ai_socktype = SOCK_STREAM;
299 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
300 fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
301 for (ai = aitop; ai; ai = ai->ai_next) {
302 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
303 if (s < 0) {
304 error("socket: %s", strerror(errno));
305 continue;
306 }
307 if (set_nonblock(s) == -1)
308 fatal("%s: set_nonblock(%d)", __func__, s);
309 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
310 errno != EINPROGRESS)
311 error("connect (`%s'): %s", host, strerror(errno));
312 else
313 break;
314 close(s);
315 s = -1;
316 }
317 freeaddrinfo(aitop);
318 return s;
319 }
320
321 static int
conalloc(char * iname,char * oname,int keytype)322 conalloc(char *iname, char *oname, int keytype)
323 {
324 char *namebase, *name, *namelist;
325 int s;
326
327 namebase = namelist = xstrdup(iname);
328
329 do {
330 name = xstrsep(&namelist, ",");
331 if (!name) {
332 xfree(namebase);
333 return (-1);
334 }
335 } while ((s = tcpconnect(name)) < 0);
336
337 if (s >= maxfd)
338 fatal("conalloc: fdno %d too high", s);
339 if (fdcon[s].c_status)
340 fatal("conalloc: attempt to reuse fdno %d", s);
341
342 fdcon[s].c_fd = s;
343 fdcon[s].c_status = CS_CON;
344 fdcon[s].c_namebase = namebase;
345 fdcon[s].c_name = name;
346 fdcon[s].c_namelist = namelist;
347 fdcon[s].c_output_name = xstrdup(oname);
348 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
349 fdcon[s].c_len = 4;
350 fdcon[s].c_off = 0;
351 fdcon[s].c_keytype = keytype;
352 gettimeofday(&fdcon[s].c_tv, NULL);
353 fdcon[s].c_tv.tv_sec += timeout;
354 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
355 FD_SET(s, read_wait);
356 ncon++;
357 return (s);
358 }
359
360 static void
confree(int s)361 confree(int s)
362 {
363 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
364 fatal("confree: attempt to free bad fdno %d", s);
365 close(s);
366 xfree(fdcon[s].c_namebase);
367 xfree(fdcon[s].c_output_name);
368 if (fdcon[s].c_status == CS_KEYS)
369 xfree(fdcon[s].c_data);
370 fdcon[s].c_status = CS_UNUSED;
371 fdcon[s].c_keytype = 0;
372 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
373 FD_CLR(s, read_wait);
374 ncon--;
375 }
376
377 static void
contouch(int s)378 contouch(int s)
379 {
380 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
381 gettimeofday(&fdcon[s].c_tv, NULL);
382 fdcon[s].c_tv.tv_sec += timeout;
383 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
384 }
385
386 static int
conrecycle(int s)387 conrecycle(int s)
388 {
389 con *c = &fdcon[s];
390 int ret;
391
392 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
393 confree(s);
394 return (ret);
395 }
396
397 static void
congreet(int s)398 congreet(int s)
399 {
400 int n = 0, remote_major = 0, remote_minor = 0;
401 char buf[256], *cp;
402 char remote_version[sizeof buf];
403 size_t bufsiz;
404 con *c = &fdcon[s];
405
406 for (;;) {
407 memset(buf, '\0', sizeof(buf));
408 bufsiz = sizeof(buf);
409 cp = buf;
410 while (bufsiz-- &&
411 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
412 if (*cp == '\r')
413 *cp = '\n';
414 cp++;
415 }
416 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
417 break;
418 }
419 if (n == 0) {
420 switch (errno) {
421 case EPIPE:
422 error("%s: Connection closed by remote host", c->c_name);
423 break;
424 case ECONNREFUSED:
425 break;
426 default:
427 error("read (%s): %s", c->c_name, strerror(errno));
428 break;
429 }
430 conrecycle(s);
431 return;
432 }
433 if (*cp != '\n' && *cp != '\r') {
434 error("%s: bad greeting", c->c_name);
435 confree(s);
436 return;
437 }
438 *cp = '\0';
439 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
440 &remote_major, &remote_minor, remote_version) == 3)
441 compat_datafellows(remote_version);
442 else
443 datafellows = 0;
444 if (c->c_keytype != KT_RSA1) {
445 if (!ssh2_capable(remote_major, remote_minor)) {
446 debug("%s doesn't support ssh2", c->c_name);
447 confree(s);
448 return;
449 }
450 } else if (remote_major != 1) {
451 debug("%s doesn't support ssh1", c->c_name);
452 confree(s);
453 return;
454 }
455 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
456 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
457 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
458 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
459 if (n < 0 || (size_t)n >= sizeof(buf)) {
460 error("snprintf: buffer too small");
461 confree(s);
462 return;
463 }
464 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
465 error("write (%s): %s", c->c_name, strerror(errno));
466 confree(s);
467 return;
468 }
469 if (c->c_keytype != KT_RSA1) {
470 keyprint(c, keygrab_ssh2(c));
471 confree(s);
472 return;
473 }
474 c->c_status = CS_SIZE;
475 contouch(s);
476 }
477
478 static void
conread(int s)479 conread(int s)
480 {
481 con *c = &fdcon[s];
482 size_t n;
483
484 if (c->c_status == CS_CON) {
485 congreet(s);
486 return;
487 }
488 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
489 if (n == 0) {
490 error("read (%s): %s", c->c_name, strerror(errno));
491 confree(s);
492 return;
493 }
494 c->c_off += n;
495
496 if (c->c_off == c->c_len)
497 switch (c->c_status) {
498 case CS_SIZE:
499 c->c_plen = htonl(c->c_plen);
500 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
501 c->c_off = 0;
502 c->c_data = xmalloc(c->c_len);
503 c->c_status = CS_KEYS;
504 break;
505 case CS_KEYS:
506 keyprint(c, keygrab_ssh1(c));
507 confree(s);
508 return;
509 default:
510 fatal("conread: invalid status %d", c->c_status);
511 break;
512 }
513
514 contouch(s);
515 }
516
517 static void
conloop(void)518 conloop(void)
519 {
520 struct timeval seltime, now;
521 fd_set *r, *e;
522 con *c;
523 int i;
524
525 gettimeofday(&now, NULL);
526 c = TAILQ_FIRST(&tq);
527
528 if (c && (c->c_tv.tv_sec > now.tv_sec ||
529 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
530 seltime = c->c_tv;
531 seltime.tv_sec -= now.tv_sec;
532 seltime.tv_usec -= now.tv_usec;
533 if (seltime.tv_usec < 0) {
534 seltime.tv_usec += 1000000;
535 seltime.tv_sec--;
536 }
537 } else
538 timerclear(&seltime);
539
540 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
541 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
542 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
543 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
544
545 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
546 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
547 ;
548
549 for (i = 0; i < maxfd; i++) {
550 if (FD_ISSET(i, e)) {
551 error("%s: exception!", fdcon[i].c_name);
552 confree(i);
553 } else if (FD_ISSET(i, r))
554 conread(i);
555 }
556 xfree(r);
557 xfree(e);
558
559 c = TAILQ_FIRST(&tq);
560 while (c && (c->c_tv.tv_sec < now.tv_sec ||
561 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
562 int s = c->c_fd;
563
564 c = TAILQ_NEXT(c, c_link);
565 conrecycle(s);
566 }
567 }
568
569 static void
do_host(char * host)570 do_host(char *host)
571 {
572 char *name = strnnsep(&host, " \t\n");
573 int j;
574
575 if (name == NULL)
576 return;
577 for (j = KT_RSA1; j <= KT_ECDSA; j *= 2) {
578 if (get_keytypes & j) {
579 while (ncon >= MAXCON)
580 conloop();
581 conalloc(name, *host ? host : name, j);
582 }
583 }
584 }
585
586 void
fatal(const char * fmt,...)587 fatal(const char *fmt,...)
588 {
589 va_list args;
590
591 va_start(args, fmt);
592 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
593 va_end(args);
594 if (nonfatal_fatal)
595 longjmp(kexjmp, -1);
596 else
597 exit(255);
598 }
599
600 static void
usage(void)601 usage(void)
602 {
603 fprintf(stderr,
604 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
605 "\t\t [host | addrlist namelist] ...\n",
606 __progname);
607 exit(1);
608 }
609
610 int
main(int argc,char ** argv)611 main(int argc, char **argv)
612 {
613 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
614 int opt, fopt_count = 0, j;
615 char *tname, *cp, line[NI_MAXHOST];
616 FILE *fp;
617 u_long linenum;
618
619 extern int optind;
620 extern char *optarg;
621
622 __progname = ssh_get_progname(argv[0]);
623 seed_rng();
624 TAILQ_INIT(&tq);
625
626 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
627 sanitise_stdfd();
628
629 if (argc <= 1)
630 usage();
631
632 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
633 switch (opt) {
634 case 'H':
635 hash_hosts = 1;
636 break;
637 case 'p':
638 ssh_port = a2port(optarg);
639 if (ssh_port <= 0) {
640 fprintf(stderr, "Bad port '%s'\n", optarg);
641 exit(1);
642 }
643 break;
644 case 'T':
645 timeout = convtime(optarg);
646 if (timeout == -1 || timeout == 0) {
647 fprintf(stderr, "Bad timeout '%s'\n", optarg);
648 usage();
649 }
650 break;
651 case 'v':
652 if (!debug_flag) {
653 debug_flag = 1;
654 log_level = SYSLOG_LEVEL_DEBUG1;
655 }
656 else if (log_level < SYSLOG_LEVEL_DEBUG3)
657 log_level++;
658 else
659 fatal("Too high debugging level.");
660 break;
661 case 'f':
662 if (strcmp(optarg, "-") == 0)
663 optarg = NULL;
664 argv[fopt_count++] = optarg;
665 break;
666 case 't':
667 get_keytypes = 0;
668 tname = strtok(optarg, ",");
669 while (tname) {
670 int type = key_type_from_name(tname);
671 switch (type) {
672 case KEY_RSA1:
673 get_keytypes |= KT_RSA1;
674 break;
675 case KEY_DSA:
676 get_keytypes |= KT_DSA;
677 break;
678 case KEY_ECDSA:
679 get_keytypes |= KT_ECDSA;
680 break;
681 case KEY_RSA:
682 get_keytypes |= KT_RSA;
683 break;
684 case KEY_UNSPEC:
685 fatal("unknown key type %s", tname);
686 }
687 tname = strtok(NULL, ",");
688 }
689 break;
690 case '4':
691 IPv4or6 = AF_INET;
692 break;
693 case '6':
694 IPv4or6 = AF_INET6;
695 break;
696 case '?':
697 default:
698 usage();
699 }
700 }
701 if (optind == argc && !fopt_count)
702 usage();
703
704 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
705
706 maxfd = fdlim_get(1);
707 if (maxfd < 0)
708 fatal("%s: fdlim_get: bad value", __progname);
709 if (maxfd > MAXMAXFD)
710 maxfd = MAXMAXFD;
711 if (MAXCON <= 0)
712 fatal("%s: not enough file descriptors", __progname);
713 if (maxfd > fdlim_get(0))
714 fdlim_set(maxfd);
715 fdcon = xcalloc(maxfd, sizeof(con));
716
717 read_wait_nfdset = howmany(maxfd, NFDBITS);
718 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
719
720 for (j = 0; j < fopt_count; j++) {
721 if (argv[j] == NULL)
722 fp = stdin;
723 else if ((fp = fopen(argv[j], "r")) == NULL)
724 fatal("%s: %s: %s", __progname, argv[j],
725 strerror(errno));
726 linenum = 0;
727
728 while (read_keyfile_line(fp,
729 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
730 &linenum) != -1) {
731 /* Chomp off trailing whitespace and comments */
732 if ((cp = strchr(line, '#')) == NULL)
733 cp = line + strlen(line) - 1;
734 while (cp >= line) {
735 if (*cp == ' ' || *cp == '\t' ||
736 *cp == '\n' || *cp == '#')
737 *cp-- = '\0';
738 else
739 break;
740 }
741
742 /* Skip empty lines */
743 if (*line == '\0')
744 continue;
745
746 do_host(line);
747 }
748
749 if (ferror(fp))
750 fatal("%s: %s: %s", __progname, argv[j],
751 strerror(errno));
752
753 fclose(fp);
754 }
755
756 while (optind < argc)
757 do_host(argv[optind++]);
758
759 while (ncon > 0)
760 conloop();
761
762 return (0);
763 }
764