1 /* $OpenBSD: ssh-keyscan.c,v 1.89 2013/12/06 13:39:49 markus 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 #define KT_ED25519 16
60
61 int get_keytypes = KT_RSA|KT_ECDSA;/* Get RSA and ECDSA keys by default */
62
63 int hash_hosts = 0; /* Hash hostname on output */
64
65 #define MAXMAXFD 256
66
67 /* The number of seconds after which to give up on a TCP connection */
68 int timeout = 5;
69
70 int maxfd;
71 #define MAXCON (maxfd - 10)
72
73 extern char *__progname;
74 fd_set *read_wait;
75 size_t read_wait_nfdset;
76 int ncon;
77 int nonfatal_fatal = 0;
78 jmp_buf kexjmp;
79 Key *kexjmp_key;
80
81 /*
82 * Keep a connection structure for each file descriptor. The state
83 * associated with file descriptor n is held in fdcon[n].
84 */
85 typedef struct Connection {
86 u_char c_status; /* State of connection on this file desc. */
87 #define CS_UNUSED 0 /* File descriptor unused */
88 #define CS_CON 1 /* Waiting to connect/read greeting */
89 #define CS_SIZE 2 /* Waiting to read initial packet size */
90 #define CS_KEYS 3 /* Waiting to read public key packet */
91 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
92 int c_plen; /* Packet length field for ssh packet */
93 int c_len; /* Total bytes which must be read. */
94 int c_off; /* Length of data read so far. */
95 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
96 char *c_namebase; /* Address to free for c_name and c_namelist */
97 char *c_name; /* Hostname of connection for errors */
98 char *c_namelist; /* Pointer to other possible addresses */
99 char *c_output_name; /* Hostname of connection for output */
100 char *c_data; /* Data read from this fd */
101 Kex *c_kex; /* The key-exchange struct for ssh2 */
102 struct timeval c_tv; /* Time at which connection gets aborted */
103 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
104 } con;
105
106 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
107 con *fdcon;
108
109 static int
fdlim_get(int hard)110 fdlim_get(int hard)
111 {
112 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
113 struct rlimit rlfd;
114
115 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
116 return (-1);
117 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
118 return SSH_SYSFDMAX;
119 else
120 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
121 #else
122 return SSH_SYSFDMAX;
123 #endif
124 }
125
126 static int
fdlim_set(int lim)127 fdlim_set(int lim)
128 {
129 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
130 struct rlimit rlfd;
131 #endif
132
133 if (lim <= 0)
134 return (-1);
135 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
136 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
137 return (-1);
138 rlfd.rlim_cur = lim;
139 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
140 return (-1);
141 #elif defined (HAVE_SETDTABLESIZE)
142 setdtablesize(lim);
143 #endif
144 return (0);
145 }
146
147 /*
148 * This is an strsep function that returns a null field for adjacent
149 * separators. This is the same as the 4.4BSD strsep, but different from the
150 * one in the GNU libc.
151 */
152 static char *
xstrsep(char ** str,const char * delim)153 xstrsep(char **str, const char *delim)
154 {
155 char *s, *e;
156
157 if (!**str)
158 return (NULL);
159
160 s = *str;
161 e = s + strcspn(s, delim);
162
163 if (*e != '\0')
164 *e++ = '\0';
165 *str = e;
166
167 return (s);
168 }
169
170 /*
171 * Get the next non-null token (like GNU strsep). Strsep() will return a
172 * null token for two adjacent separators, so we may have to loop.
173 */
174 static char *
strnnsep(char ** stringp,char * delim)175 strnnsep(char **stringp, char *delim)
176 {
177 char *tok;
178
179 do {
180 tok = xstrsep(stringp, delim);
181 } while (tok && *tok == '\0');
182 return (tok);
183 }
184
185 static Key *
keygrab_ssh1(con * c)186 keygrab_ssh1(con *c)
187 {
188 static Key *rsa;
189 static Buffer msg;
190
191 if (rsa == NULL) {
192 buffer_init(&msg);
193 rsa = key_new(KEY_RSA1);
194 }
195 buffer_append(&msg, c->c_data, c->c_plen);
196 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
197 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
198 error("%s: invalid packet type", c->c_name);
199 buffer_clear(&msg);
200 return NULL;
201 }
202 buffer_consume(&msg, 8); /* cookie */
203
204 /* server key */
205 (void) buffer_get_int(&msg);
206 buffer_get_bignum(&msg, rsa->rsa->e);
207 buffer_get_bignum(&msg, rsa->rsa->n);
208
209 /* host key */
210 (void) buffer_get_int(&msg);
211 buffer_get_bignum(&msg, rsa->rsa->e);
212 buffer_get_bignum(&msg, rsa->rsa->n);
213
214 buffer_clear(&msg);
215
216 return (rsa);
217 }
218
219 static int
hostjump(Key * hostkey)220 hostjump(Key *hostkey)
221 {
222 kexjmp_key = hostkey;
223 longjmp(kexjmp, 1);
224 }
225
226 static int
ssh2_capable(int remote_major,int remote_minor)227 ssh2_capable(int remote_major, int remote_minor)
228 {
229 switch (remote_major) {
230 case 1:
231 if (remote_minor == 99)
232 return 1;
233 break;
234 case 2:
235 return 1;
236 default:
237 break;
238 }
239 return 0;
240 }
241
242 static Key *
keygrab_ssh2(con * c)243 keygrab_ssh2(con *c)
244 {
245 int j;
246
247 packet_set_connection(c->c_fd, c->c_fd);
248 enable_compat20();
249 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
250 c->c_keytype == KT_DSA ? "ssh-dss" :
251 (c->c_keytype == KT_RSA ? "ssh-rsa" :
252 (c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
253 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
254 c->c_kex = kex_setup(myproposal);
255 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
256 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
257 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
258 c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
259 c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
260 c->c_kex->kex[KEX_C25519_SHA256] = kexc25519_client;
261 c->c_kex->verify_host_key = hostjump;
262
263 if (!(j = setjmp(kexjmp))) {
264 nonfatal_fatal = 1;
265 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
266 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
267 exit(1);
268 }
269 nonfatal_fatal = 0;
270 free(c->c_kex);
271 c->c_kex = NULL;
272 packet_close();
273
274 return j < 0? NULL : kexjmp_key;
275 }
276
277 static void
keyprint(con * c,Key * key)278 keyprint(con *c, Key *key)
279 {
280 char *host = c->c_output_name ? c->c_output_name : c->c_name;
281
282 if (!key)
283 return;
284 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
285 fatal("host_hash failed");
286
287 fprintf(stdout, "%s ", host);
288 key_write(key, stdout);
289 fputs("\n", stdout);
290 }
291
292 static int
tcpconnect(char * host)293 tcpconnect(char *host)
294 {
295 struct addrinfo hints, *ai, *aitop;
296 char strport[NI_MAXSERV];
297 int gaierr, s = -1;
298
299 snprintf(strport, sizeof strport, "%d", ssh_port);
300 memset(&hints, 0, sizeof(hints));
301 hints.ai_family = IPv4or6;
302 hints.ai_socktype = SOCK_STREAM;
303 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
304 fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
305 for (ai = aitop; ai; ai = ai->ai_next) {
306 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
307 if (s < 0) {
308 error("socket: %s", strerror(errno));
309 continue;
310 }
311 if (set_nonblock(s) == -1)
312 fatal("%s: set_nonblock(%d)", __func__, s);
313 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
314 errno != EINPROGRESS)
315 error("connect (`%s'): %s", host, strerror(errno));
316 else
317 break;
318 close(s);
319 s = -1;
320 }
321 freeaddrinfo(aitop);
322 return s;
323 }
324
325 static int
conalloc(char * iname,char * oname,int keytype)326 conalloc(char *iname, char *oname, int keytype)
327 {
328 char *namebase, *name, *namelist;
329 int s;
330
331 namebase = namelist = xstrdup(iname);
332
333 do {
334 name = xstrsep(&namelist, ",");
335 if (!name) {
336 free(namebase);
337 return (-1);
338 }
339 } while ((s = tcpconnect(name)) < 0);
340
341 if (s >= maxfd)
342 fatal("conalloc: fdno %d too high", s);
343 if (fdcon[s].c_status)
344 fatal("conalloc: attempt to reuse fdno %d", s);
345
346 fdcon[s].c_fd = s;
347 fdcon[s].c_status = CS_CON;
348 fdcon[s].c_namebase = namebase;
349 fdcon[s].c_name = name;
350 fdcon[s].c_namelist = namelist;
351 fdcon[s].c_output_name = xstrdup(oname);
352 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
353 fdcon[s].c_len = 4;
354 fdcon[s].c_off = 0;
355 fdcon[s].c_keytype = keytype;
356 gettimeofday(&fdcon[s].c_tv, NULL);
357 fdcon[s].c_tv.tv_sec += timeout;
358 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
359 FD_SET(s, read_wait);
360 ncon++;
361 return (s);
362 }
363
364 static void
confree(int s)365 confree(int s)
366 {
367 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
368 fatal("confree: attempt to free bad fdno %d", s);
369 close(s);
370 free(fdcon[s].c_namebase);
371 free(fdcon[s].c_output_name);
372 if (fdcon[s].c_status == CS_KEYS)
373 free(fdcon[s].c_data);
374 fdcon[s].c_status = CS_UNUSED;
375 fdcon[s].c_keytype = 0;
376 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
377 FD_CLR(s, read_wait);
378 ncon--;
379 }
380
381 static void
contouch(int s)382 contouch(int s)
383 {
384 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
385 gettimeofday(&fdcon[s].c_tv, NULL);
386 fdcon[s].c_tv.tv_sec += timeout;
387 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
388 }
389
390 static int
conrecycle(int s)391 conrecycle(int s)
392 {
393 con *c = &fdcon[s];
394 int ret;
395
396 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
397 confree(s);
398 return (ret);
399 }
400
401 static void
congreet(int s)402 congreet(int s)
403 {
404 int n = 0, remote_major = 0, remote_minor = 0;
405 char buf[256], *cp;
406 char remote_version[sizeof buf];
407 size_t bufsiz;
408 con *c = &fdcon[s];
409
410 for (;;) {
411 memset(buf, '\0', sizeof(buf));
412 bufsiz = sizeof(buf);
413 cp = buf;
414 while (bufsiz-- &&
415 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
416 if (*cp == '\r')
417 *cp = '\n';
418 cp++;
419 }
420 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
421 break;
422 }
423 if (n == 0) {
424 switch (errno) {
425 case EPIPE:
426 error("%s: Connection closed by remote host", c->c_name);
427 break;
428 case ECONNREFUSED:
429 break;
430 default:
431 error("read (%s): %s", c->c_name, strerror(errno));
432 break;
433 }
434 conrecycle(s);
435 return;
436 }
437 if (*cp != '\n' && *cp != '\r') {
438 error("%s: bad greeting", c->c_name);
439 confree(s);
440 return;
441 }
442 *cp = '\0';
443 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
444 &remote_major, &remote_minor, remote_version) == 3)
445 compat_datafellows(remote_version);
446 else
447 datafellows = 0;
448 if (c->c_keytype != KT_RSA1) {
449 if (!ssh2_capable(remote_major, remote_minor)) {
450 debug("%s doesn't support ssh2", c->c_name);
451 confree(s);
452 return;
453 }
454 } else if (remote_major != 1) {
455 debug("%s doesn't support ssh1", c->c_name);
456 confree(s);
457 return;
458 }
459 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
460 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
461 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
462 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
463 if (n < 0 || (size_t)n >= sizeof(buf)) {
464 error("snprintf: buffer too small");
465 confree(s);
466 return;
467 }
468 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
469 error("write (%s): %s", c->c_name, strerror(errno));
470 confree(s);
471 return;
472 }
473 if (c->c_keytype != KT_RSA1) {
474 keyprint(c, keygrab_ssh2(c));
475 confree(s);
476 return;
477 }
478 c->c_status = CS_SIZE;
479 contouch(s);
480 }
481
482 static void
conread(int s)483 conread(int s)
484 {
485 con *c = &fdcon[s];
486 size_t n;
487
488 if (c->c_status == CS_CON) {
489 congreet(s);
490 return;
491 }
492 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
493 if (n == 0) {
494 error("read (%s): %s", c->c_name, strerror(errno));
495 confree(s);
496 return;
497 }
498 c->c_off += n;
499
500 if (c->c_off == c->c_len)
501 switch (c->c_status) {
502 case CS_SIZE:
503 c->c_plen = htonl(c->c_plen);
504 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
505 c->c_off = 0;
506 c->c_data = xmalloc(c->c_len);
507 c->c_status = CS_KEYS;
508 break;
509 case CS_KEYS:
510 keyprint(c, keygrab_ssh1(c));
511 confree(s);
512 return;
513 default:
514 fatal("conread: invalid status %d", c->c_status);
515 break;
516 }
517
518 contouch(s);
519 }
520
521 static void
conloop(void)522 conloop(void)
523 {
524 struct timeval seltime, now;
525 fd_set *r, *e;
526 con *c;
527 int i;
528
529 gettimeofday(&now, NULL);
530 c = TAILQ_FIRST(&tq);
531
532 if (c && (c->c_tv.tv_sec > now.tv_sec ||
533 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
534 seltime = c->c_tv;
535 seltime.tv_sec -= now.tv_sec;
536 seltime.tv_usec -= now.tv_usec;
537 if (seltime.tv_usec < 0) {
538 seltime.tv_usec += 1000000;
539 seltime.tv_sec--;
540 }
541 } else
542 timerclear(&seltime);
543
544 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
545 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
546 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
547 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
548
549 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
550 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
551 ;
552
553 for (i = 0; i < maxfd; i++) {
554 if (FD_ISSET(i, e)) {
555 error("%s: exception!", fdcon[i].c_name);
556 confree(i);
557 } else if (FD_ISSET(i, r))
558 conread(i);
559 }
560 free(r);
561 free(e);
562
563 c = TAILQ_FIRST(&tq);
564 while (c && (c->c_tv.tv_sec < now.tv_sec ||
565 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
566 int s = c->c_fd;
567
568 c = TAILQ_NEXT(c, c_link);
569 conrecycle(s);
570 }
571 }
572
573 static void
do_host(char * host)574 do_host(char *host)
575 {
576 char *name = strnnsep(&host, " \t\n");
577 int j;
578
579 if (name == NULL)
580 return;
581 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
582 if (get_keytypes & j) {
583 while (ncon >= MAXCON)
584 conloop();
585 conalloc(name, *host ? host : name, j);
586 }
587 }
588 }
589
590 void
fatal(const char * fmt,...)591 fatal(const char *fmt,...)
592 {
593 va_list args;
594
595 va_start(args, fmt);
596 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
597 va_end(args);
598 if (nonfatal_fatal)
599 longjmp(kexjmp, -1);
600 else
601 exit(255);
602 }
603
604 static void
usage(void)605 usage(void)
606 {
607 fprintf(stderr,
608 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
609 "\t\t [host | addrlist namelist] ...\n",
610 __progname);
611 exit(1);
612 }
613
614 int
main(int argc,char ** argv)615 main(int argc, char **argv)
616 {
617 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
618 int opt, fopt_count = 0, j;
619 char *tname, *cp, line[NI_MAXHOST];
620 FILE *fp;
621 u_long linenum;
622
623 extern int optind;
624 extern char *optarg;
625
626 __progname = ssh_get_progname(argv[0]);
627 seed_rng();
628 TAILQ_INIT(&tq);
629
630 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
631 sanitise_stdfd();
632
633 if (argc <= 1)
634 usage();
635
636 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
637 switch (opt) {
638 case 'H':
639 hash_hosts = 1;
640 break;
641 case 'p':
642 ssh_port = a2port(optarg);
643 if (ssh_port <= 0) {
644 fprintf(stderr, "Bad port '%s'\n", optarg);
645 exit(1);
646 }
647 break;
648 case 'T':
649 timeout = convtime(optarg);
650 if (timeout == -1 || timeout == 0) {
651 fprintf(stderr, "Bad timeout '%s'\n", optarg);
652 usage();
653 }
654 break;
655 case 'v':
656 if (!debug_flag) {
657 debug_flag = 1;
658 log_level = SYSLOG_LEVEL_DEBUG1;
659 }
660 else if (log_level < SYSLOG_LEVEL_DEBUG3)
661 log_level++;
662 else
663 fatal("Too high debugging level.");
664 break;
665 case 'f':
666 if (strcmp(optarg, "-") == 0)
667 optarg = NULL;
668 argv[fopt_count++] = optarg;
669 break;
670 case 't':
671 get_keytypes = 0;
672 tname = strtok(optarg, ",");
673 while (tname) {
674 int type = key_type_from_name(tname);
675 switch (type) {
676 case KEY_RSA1:
677 get_keytypes |= KT_RSA1;
678 break;
679 case KEY_DSA:
680 get_keytypes |= KT_DSA;
681 break;
682 case KEY_ECDSA:
683 get_keytypes |= KT_ECDSA;
684 break;
685 case KEY_RSA:
686 get_keytypes |= KT_RSA;
687 break;
688 case KEY_ED25519:
689 get_keytypes |= KT_ED25519;
690 break;
691 case KEY_UNSPEC:
692 fatal("unknown key type %s", tname);
693 }
694 tname = strtok(NULL, ",");
695 }
696 break;
697 case '4':
698 IPv4or6 = AF_INET;
699 break;
700 case '6':
701 IPv4or6 = AF_INET6;
702 break;
703 case '?':
704 default:
705 usage();
706 }
707 }
708 if (optind == argc && !fopt_count)
709 usage();
710
711 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
712
713 maxfd = fdlim_get(1);
714 if (maxfd < 0)
715 fatal("%s: fdlim_get: bad value", __progname);
716 if (maxfd > MAXMAXFD)
717 maxfd = MAXMAXFD;
718 if (MAXCON <= 0)
719 fatal("%s: not enough file descriptors", __progname);
720 if (maxfd > fdlim_get(0))
721 fdlim_set(maxfd);
722 fdcon = xcalloc(maxfd, sizeof(con));
723
724 read_wait_nfdset = howmany(maxfd, NFDBITS);
725 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
726
727 for (j = 0; j < fopt_count; j++) {
728 if (argv[j] == NULL)
729 fp = stdin;
730 else if ((fp = fopen(argv[j], "r")) == NULL)
731 fatal("%s: %s: %s", __progname, argv[j],
732 strerror(errno));
733 linenum = 0;
734
735 while (read_keyfile_line(fp,
736 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
737 &linenum) != -1) {
738 /* Chomp off trailing whitespace and comments */
739 if ((cp = strchr(line, '#')) == NULL)
740 cp = line + strlen(line) - 1;
741 while (cp >= line) {
742 if (*cp == ' ' || *cp == '\t' ||
743 *cp == '\n' || *cp == '#')
744 *cp-- = '\0';
745 else
746 break;
747 }
748
749 /* Skip empty lines */
750 if (*line == '\0')
751 continue;
752
753 do_host(line);
754 }
755
756 if (ferror(fp))
757 fatal("%s: %s: %s", __progname, argv[j],
758 strerror(errno));
759
760 fclose(fp);
761 }
762
763 while (optind < argc)
764 do_host(argv[optind++]);
765
766 while (ncon > 0)
767 conloop();
768
769 return (0);
770 }
771