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djm@openbsd.org802660c2015-01-30 10:44:49 +00001/* $OpenBSD: ssh-keyscan.c,v 1.99 2015/01/30 10:44:49 djm Exp $ */
Ben Lindstromb6434ae2000-12-05 01:15:09 +00002/*
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
Ben Lindstroma238f6e2001-06-09 01:30:39 +00007 * OpenBSD project by leaving this copyright notice intact.
Ben Lindstromb6434ae2000-12-05 01:15:09 +00008 */
9
10#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110011
djm@openbsd.org48b68ce2014-12-11 08:20:09 +000012#include <sys/types.h>
Damien Miller9b481512002-09-12 10:43:29 +100013#include "openbsd-compat/sys-queue.h"
Damien Millercd4223c2006-03-15 11:22:47 +110014#include <sys/resource.h>
Damien Miller9aec9192006-08-05 10:57:45 +100015#ifdef HAVE_SYS_TIME_H
16# include <sys/time.h>
17#endif
Damien Millere3476ed2006-07-24 14:13:33 +100018
Darren Tucker46aa3e02006-09-02 15:32:40 +100019#include <netinet/in.h>
20#include <arpa/inet.h>
21
Damien Millere3476ed2006-07-24 14:13:33 +100022#include <openssl/bn.h>
23
Damien Millerb8fe89c2006-07-24 14:51:00 +100024#include <netdb.h>
Darren Tuckerdeecec92006-07-12 22:44:34 +100025#include <errno.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100026#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100027#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100028#include <stdlib.h>
Damien Millerd7834352006-08-05 12:39:39 +100029#include <signal.h>
Damien Millere3476ed2006-07-24 14:13:33 +100030#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100031#include <unistd.h>
Ben Lindstromb6434ae2000-12-05 01:15:09 +000032
Ben Lindstromb6434ae2000-12-05 01:15:09 +000033#include "xmalloc.h"
34#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000035#include "ssh1.h"
markus@openbsd.org3f797652015-01-19 20:32:39 +000036#include "sshbuf.h"
37#include "sshkey.h"
Damien Millerd7834352006-08-05 12:39:39 +100038#include "cipher.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000039#include "kex.h"
40#include "compat.h"
41#include "myproposal.h"
42#include "packet.h"
43#include "dispatch.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000044#include "log.h"
Ben Lindstromd20b8552001-03-05 07:01:18 +000045#include "atomicio.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000046#include "misc.h"
Damien Millerdb7b8172005-03-01 21:48:03 +110047#include "hostfile.h"
markus@openbsd.org3f797652015-01-19 20:32:39 +000048#include "ssherr.h"
49#include "ssh_api.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000050
Ben Lindstrom325e70c2001-08-06 22:41:30 +000051/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
52 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000053int IPv4or6 = AF_UNSPEC;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000054
Ben Lindstrom325e70c2001-08-06 22:41:30 +000055int ssh_port = SSH_DEFAULT_PORT;
Kevin Steves76e7d9b2001-09-20 20:30:09 +000056
Damien Millereb8b60e2010-08-31 22:41:14 +100057#define KT_RSA1 1
58#define KT_DSA 2
59#define KT_RSA 4
60#define KT_ECDSA 8
Damien Miller5be9d9e2013-12-07 11:24:01 +110061#define KT_ED25519 16
Kevin Steves76e7d9b2001-09-20 20:30:09 +000062
Damien Miller1c7ef4b2014-04-20 12:59:46 +100063int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000064
Damien Millerdb7b8172005-03-01 21:48:03 +110065int hash_hosts = 0; /* Hash hostname on output */
66
Ben Lindstromb6434ae2000-12-05 01:15:09 +000067#define MAXMAXFD 256
68
69/* The number of seconds after which to give up on a TCP connection */
70int timeout = 5;
71
72int maxfd;
Ben Lindstromd20b8552001-03-05 07:01:18 +000073#define MAXCON (maxfd - 10)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000074
Kevin Stevesec84dc12000-12-13 17:45:15 +000075extern char *__progname;
Ben Lindstromc1e04212001-03-05 07:04:38 +000076fd_set *read_wait;
Damien Miller07d86be2006-03-26 14:19:21 +110077size_t read_wait_nfdset;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000078int ncon;
79
Damien Millerade31d72015-01-27 23:06:23 +110080struct ssh *active_state = NULL; /* XXX needed for linking */
81
Ben Lindstromb6434ae2000-12-05 01:15:09 +000082/*
83 * Keep a connection structure for each file descriptor. The state
84 * associated with file descriptor n is held in fdcon[n].
85 */
86typedef struct Connection {
Ben Lindstrom46c16222000-12-22 01:43:59 +000087 u_char c_status; /* State of connection on this file desc. */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000088#define CS_UNUSED 0 /* File descriptor unused */
89#define CS_CON 1 /* Waiting to connect/read greeting */
90#define CS_SIZE 2 /* Waiting to read initial packet size */
91#define CS_KEYS 3 /* Waiting to read public key packet */
92 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
93 int c_plen; /* Packet length field for ssh packet */
94 int c_len; /* Total bytes which must be read. */
95 int c_off; /* Length of data read so far. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000096 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
markus@openbsd.org3f797652015-01-19 20:32:39 +000097 int c_done; /* SSH2 done */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000098 char *c_namebase; /* Address to free for c_name and c_namelist */
99 char *c_name; /* Hostname of connection for errors */
100 char *c_namelist; /* Pointer to other possible addresses */
101 char *c_output_name; /* Hostname of connection for output */
102 char *c_data; /* Data read from this fd */
markus@openbsd.org3f797652015-01-19 20:32:39 +0000103 struct ssh *c_ssh; /* SSH-connection */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000104 struct timeval c_tv; /* Time at which connection gets aborted */
105 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
106} con;
107
108TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
109con *fdcon;
110
markus@openbsd.org3f797652015-01-19 20:32:39 +0000111static void keyprint(con *c, struct sshkey *key);
112
Ben Lindstrombba81212001-06-25 05:01:22 +0000113static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000114fdlim_get(int hard)
115{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000116#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000117 struct rlimit rlfd;
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000118
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000119 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
120 return (-1);
121 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
Damien Millere00074a2003-11-24 13:07:45 +1100122 return SSH_SYSFDMAX;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000123 else
124 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000125#else
Damien Millere00074a2003-11-24 13:07:45 +1100126 return SSH_SYSFDMAX;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000127#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000128}
129
Ben Lindstrombba81212001-06-25 05:01:22 +0000130static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000131fdlim_set(int lim)
132{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000133#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000134 struct rlimit rlfd;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000135#endif
Ben Lindstrom5c98db52002-07-07 22:25:29 +0000136
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000137 if (lim <= 0)
138 return (-1);
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000139#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000140 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
141 return (-1);
142 rlfd.rlim_cur = lim;
143 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
144 return (-1);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000145#elif defined (HAVE_SETDTABLESIZE)
Kevin Steves28a7f262001-02-05 15:43:59 +0000146 setdtablesize(lim);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000147#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000148 return (0);
149}
150
151/*
152 * This is an strsep function that returns a null field for adjacent
153 * separators. This is the same as the 4.4BSD strsep, but different from the
154 * one in the GNU libc.
155 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000156static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000157xstrsep(char **str, const char *delim)
158{
159 char *s, *e;
160
161 if (!**str)
162 return (NULL);
163
164 s = *str;
165 e = s + strcspn(s, delim);
166
167 if (*e != '\0')
168 *e++ = '\0';
169 *str = e;
170
171 return (s);
172}
173
174/*
175 * Get the next non-null token (like GNU strsep). Strsep() will return a
176 * null token for two adjacent separators, so we may have to loop.
177 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000178static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000179strnnsep(char **stringp, char *delim)
180{
181 char *tok;
182
183 do {
184 tok = xstrsep(stringp, delim);
185 } while (tok && *tok == '\0');
186 return (tok);
187}
188
Damien Miller1f0311c2014-05-15 14:24:09 +1000189#ifdef WITH_SSH1
markus@openbsd.org3f797652015-01-19 20:32:39 +0000190static struct sshkey *
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000191keygrab_ssh1(con *c)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000192{
markus@openbsd.org3f797652015-01-19 20:32:39 +0000193 static struct sshkey *rsa;
194 static struct sshbuf *msg;
195 int r;
196 u_char type;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000197
198 if (rsa == NULL) {
markus@openbsd.org3f797652015-01-19 20:32:39 +0000199 if ((rsa = sshkey_new(KEY_RSA1)) == NULL) {
200 error("%s: sshkey_new failed", __func__);
201 return NULL;
202 }
203 if ((msg = sshbuf_new()) == NULL)
204 fatal("%s: sshbuf_new failed", __func__);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000205 }
markus@openbsd.org3f797652015-01-19 20:32:39 +0000206 if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 ||
207 (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */
208 (r = sshbuf_get_u8(msg, &type)) != 0)
209 goto buf_err;
210 if (type != (int) SSH_SMSG_PUBLIC_KEY) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000211 error("%s: invalid packet type", c->c_name);
markus@openbsd.org3f797652015-01-19 20:32:39 +0000212 sshbuf_reset(msg);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000213 return NULL;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000214 }
markus@openbsd.org3f797652015-01-19 20:32:39 +0000215 if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */
216 /* server key */
217 (r = sshbuf_get_u32(msg, NULL)) != 0 ||
218 (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
219 (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
220 /* host key */
221 (r = sshbuf_get_u32(msg, NULL)) != 0 ||
222 (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 ||
223 (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) {
224 buf_err:
225 error("%s: buffer error: %s", __func__, ssh_err(r));
226 sshbuf_reset(msg);
227 return NULL;
228 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000229
markus@openbsd.org3f797652015-01-19 20:32:39 +0000230 sshbuf_reset(msg);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000231
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000232 return (rsa);
233}
Damien Miller1f0311c2014-05-15 14:24:09 +1000234#endif
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000235
236static int
markus@openbsd.org3f797652015-01-19 20:32:39 +0000237key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000238{
markus@openbsd.org3f797652015-01-19 20:32:39 +0000239 con *c;
240
241 if ((c = ssh_get_app_data(ssh)) != NULL)
242 keyprint(c, hostkey);
243 /* always abort key exchange */
244 return -1;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000245}
246
247static int
248ssh2_capable(int remote_major, int remote_minor)
249{
250 switch (remote_major) {
251 case 1:
252 if (remote_minor == 99)
253 return 1;
254 break;
255 case 2:
256 return 1;
257 default:
258 break;
259 }
260 return 0;
261}
262
markus@openbsd.org3f797652015-01-19 20:32:39 +0000263static void
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000264keygrab_ssh2(con *c)
265{
Damien Miller9235a032014-04-20 13:17:20 +1000266 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
markus@openbsd.org3f797652015-01-19 20:32:39 +0000267 int r;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000268
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000269 enable_compat20();
Damien Miller5be9d9e2013-12-07 11:24:01 +1100270 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
271 c->c_keytype == KT_DSA ? "ssh-dss" :
272 (c->c_keytype == KT_RSA ? "ssh-rsa" :
273 (c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
274 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
markus@openbsd.org3f797652015-01-19 20:32:39 +0000275 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
276 free(c->c_ssh);
277 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000278 exit(1);
279 }
markus@openbsd.org3f797652015-01-19 20:32:39 +0000280#ifdef WITH_OPENSSL
281 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
282 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
283 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
284 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
Darren Tuckerf2004cd2015-02-23 05:04:21 +1100285# ifdef OPENSSL_HAS_ECC
markus@openbsd.org3f797652015-01-19 20:32:39 +0000286 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
Darren Tuckerf2004cd2015-02-23 05:04:21 +1100287# endif
markus@openbsd.org3f797652015-01-19 20:32:39 +0000288#endif
289 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
290 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
291 /*
292 * do the key-exchange until an error occurs or until
293 * the key_print_wrapper() callback sets c_done.
294 */
295 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000296}
297
298static void
markus@openbsd.org3f797652015-01-19 20:32:39 +0000299keyprint(con *c, struct sshkey *key)
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000300{
Damien Millerdb7b8172005-03-01 21:48:03 +1100301 char *host = c->c_output_name ? c->c_output_name : c->c_name;
302
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000303 if (!key)
304 return;
Damien Millerdb7b8172005-03-01 21:48:03 +1100305 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
306 fatal("host_hash failed");
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000307
Damien Millerdb7b8172005-03-01 21:48:03 +1100308 fprintf(stdout, "%s ", host);
markus@openbsd.org3f797652015-01-19 20:32:39 +0000309 sshkey_write(key, stdout);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000310 fputs("\n", stdout);
311}
312
Ben Lindstrombba81212001-06-25 05:01:22 +0000313static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000314tcpconnect(char *host)
315{
316 struct addrinfo hints, *ai, *aitop;
317 char strport[NI_MAXSERV];
318 int gaierr, s = -1;
319
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000320 snprintf(strport, sizeof strport, "%d", ssh_port);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000321 memset(&hints, 0, sizeof(hints));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000322 hints.ai_family = IPv4or6;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000323 hints.ai_socktype = SOCK_STREAM;
djm@openbsd.orgfae7bbe2015-01-28 21:15:47 +0000324 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
325 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
326 return -1;
327 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000328 for (ai = aitop; ai; ai = ai->ai_next) {
Darren Tucker7bd98e72010-01-10 10:31:12 +1100329 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000330 if (s < 0) {
331 error("socket: %s", strerror(errno));
332 continue;
333 }
Damien Miller232711f2004-06-15 10:35:30 +1000334 if (set_nonblock(s) == -1)
335 fatal("%s: set_nonblock(%d)", __func__, s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000336 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
337 errno != EINPROGRESS)
338 error("connect (`%s'): %s", host, strerror(errno));
339 else
340 break;
341 close(s);
342 s = -1;
343 }
344 freeaddrinfo(aitop);
345 return s;
346}
347
Ben Lindstrombba81212001-06-25 05:01:22 +0000348static int
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000349conalloc(char *iname, char *oname, int keytype)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000350{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000351 char *namebase, *name, *namelist;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000352 int s;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000353
354 namebase = namelist = xstrdup(iname);
355
356 do {
357 name = xstrsep(&namelist, ",");
358 if (!name) {
Darren Tuckera627d422013-06-02 07:31:17 +1000359 free(namebase);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000360 return (-1);
361 }
362 } while ((s = tcpconnect(name)) < 0);
363
364 if (s >= maxfd)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000365 fatal("conalloc: fdno %d too high", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000366 if (fdcon[s].c_status)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000367 fatal("conalloc: attempt to reuse fdno %d", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000368
369 fdcon[s].c_fd = s;
370 fdcon[s].c_status = CS_CON;
371 fdcon[s].c_namebase = namebase;
372 fdcon[s].c_name = name;
373 fdcon[s].c_namelist = namelist;
374 fdcon[s].c_output_name = xstrdup(oname);
375 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
376 fdcon[s].c_len = 4;
377 fdcon[s].c_off = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000378 fdcon[s].c_keytype = keytype;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000379 gettimeofday(&fdcon[s].c_tv, NULL);
380 fdcon[s].c_tv.tv_sec += timeout;
381 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000382 FD_SET(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000383 ncon++;
384 return (s);
385}
386
Ben Lindstrombba81212001-06-25 05:01:22 +0000387static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000388confree(int s)
389{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000390 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000391 fatal("confree: attempt to free bad fdno %d", s);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000392 close(s);
Darren Tuckera627d422013-06-02 07:31:17 +1000393 free(fdcon[s].c_namebase);
394 free(fdcon[s].c_output_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000395 if (fdcon[s].c_status == CS_KEYS)
Darren Tuckera627d422013-06-02 07:31:17 +1000396 free(fdcon[s].c_data);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000397 fdcon[s].c_status = CS_UNUSED;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000398 fdcon[s].c_keytype = 0;
markus@openbsd.org3f797652015-01-19 20:32:39 +0000399 if (fdcon[s].c_ssh) {
400 ssh_packet_close(fdcon[s].c_ssh);
401 free(fdcon[s].c_ssh);
402 fdcon[s].c_ssh = NULL;
403 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000404 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000405 FD_CLR(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000406 ncon--;
407}
408
Ben Lindstrombba81212001-06-25 05:01:22 +0000409static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000410contouch(int s)
411{
412 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
413 gettimeofday(&fdcon[s].c_tv, NULL);
414 fdcon[s].c_tv.tv_sec += timeout;
415 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
416}
417
Ben Lindstrombba81212001-06-25 05:01:22 +0000418static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000419conrecycle(int s)
420{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000421 con *c = &fdcon[s];
Ben Lindstrom965710f2002-07-07 22:17:22 +0000422 int ret;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000423
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000424 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000425 confree(s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000426 return (ret);
427}
428
Ben Lindstrombba81212001-06-25 05:01:22 +0000429static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000430congreet(int s)
431{
Damien Millereccb9de2005-06-17 12:59:34 +1000432 int n = 0, remote_major = 0, remote_minor = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000433 char buf[256], *cp;
Damien Miller83c02ef2001-12-21 12:45:43 +1100434 char remote_version[sizeof buf];
Damien Millereccb9de2005-06-17 12:59:34 +1000435 size_t bufsiz;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000436 con *c = &fdcon[s];
437
Damien Miller4bbacb72005-11-05 15:12:28 +1100438 for (;;) {
439 memset(buf, '\0', sizeof(buf));
440 bufsiz = sizeof(buf);
441 cp = buf;
442 while (bufsiz-- &&
443 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
444 if (*cp == '\r')
445 *cp = '\n';
446 cp++;
447 }
448 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
449 break;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000450 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000451 if (n == 0) {
Damien Millerb253cc42005-05-26 12:23:44 +1000452 switch (errno) {
453 case EPIPE:
454 error("%s: Connection closed by remote host", c->c_name);
455 break;
456 case ECONNREFUSED:
457 break;
458 default:
459 error("read (%s): %s", c->c_name, strerror(errno));
460 break;
461 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000462 conrecycle(s);
463 return;
464 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000465 if (*cp != '\n' && *cp != '\r') {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000466 error("%s: bad greeting", c->c_name);
467 confree(s);
468 return;
469 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000470 *cp = '\0';
djm@openbsd.org4509b5d2015-01-30 01:13:33 +0000471 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
472 fatal("ssh_packet_set_connection failed");
djm@openbsd.org802660c2015-01-30 10:44:49 +0000473 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
markus@openbsd.org3f797652015-01-19 20:32:39 +0000474 ssh_set_app_data(c->c_ssh, c); /* back link */
Damien Miller83c02ef2001-12-21 12:45:43 +1100475 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
476 &remote_major, &remote_minor, remote_version) == 3)
markus@openbsd.org3f797652015-01-19 20:32:39 +0000477 c->c_ssh->compat = compat_datafellows(remote_version);
Damien Miller83c02ef2001-12-21 12:45:43 +1100478 else
markus@openbsd.org3f797652015-01-19 20:32:39 +0000479 c->c_ssh->compat = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000480 if (c->c_keytype != KT_RSA1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000481 if (!ssh2_capable(remote_major, remote_minor)) {
482 debug("%s doesn't support ssh2", c->c_name);
483 confree(s);
484 return;
485 }
Damien Miller83c02ef2001-12-21 12:45:43 +1100486 } else if (remote_major != 1) {
487 debug("%s doesn't support ssh1", c->c_name);
488 confree(s);
489 return;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000490 }
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000491 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000492 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
493 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
494 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
Damien Millereccb9de2005-06-17 12:59:34 +1000495 if (n < 0 || (size_t)n >= sizeof(buf)) {
Damien Miller41bfc292005-05-26 12:07:32 +1000496 error("snprintf: buffer too small");
497 confree(s);
498 return;
499 }
Damien Millereccb9de2005-06-17 12:59:34 +1000500 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000501 error("write (%s): %s", c->c_name, strerror(errno));
502 confree(s);
503 return;
504 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000505 if (c->c_keytype != KT_RSA1) {
markus@openbsd.org3f797652015-01-19 20:32:39 +0000506 keygrab_ssh2(c);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000507 confree(s);
508 return;
509 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000510 c->c_status = CS_SIZE;
511 contouch(s);
512}
513
Ben Lindstrombba81212001-06-25 05:01:22 +0000514static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000515conread(int s)
516{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000517 con *c = &fdcon[s];
Damien Millerb253cc42005-05-26 12:23:44 +1000518 size_t n;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000519
520 if (c->c_status == CS_CON) {
521 congreet(s);
522 return;
523 }
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000524 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
Damien Millerb253cc42005-05-26 12:23:44 +1000525 if (n == 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000526 error("read (%s): %s", c->c_name, strerror(errno));
527 confree(s);
528 return;
529 }
530 c->c_off += n;
531
532 if (c->c_off == c->c_len)
533 switch (c->c_status) {
534 case CS_SIZE:
535 c->c_plen = htonl(c->c_plen);
536 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
537 c->c_off = 0;
538 c->c_data = xmalloc(c->c_len);
539 c->c_status = CS_KEYS;
540 break;
Damien Miller1f0311c2014-05-15 14:24:09 +1000541#ifdef WITH_SSH1
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000542 case CS_KEYS:
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000543 keyprint(c, keygrab_ssh1(c));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000544 confree(s);
545 return;
Damien Miller1f0311c2014-05-15 14:24:09 +1000546#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000547 default:
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000548 fatal("conread: invalid status %d", c->c_status);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000549 break;
550 }
551
552 contouch(s);
553}
554
Ben Lindstrombba81212001-06-25 05:01:22 +0000555static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000556conloop(void)
557{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000558 struct timeval seltime, now;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000559 fd_set *r, *e;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000560 con *c;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000561 int i;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000562
563 gettimeofday(&now, NULL);
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000564 c = TAILQ_FIRST(&tq);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000565
Ben Lindstromd20b8552001-03-05 07:01:18 +0000566 if (c && (c->c_tv.tv_sec > now.tv_sec ||
567 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000568 seltime = c->c_tv;
569 seltime.tv_sec -= now.tv_sec;
570 seltime.tv_usec -= now.tv_usec;
Ben Lindstromc791beb2001-02-10 23:18:11 +0000571 if (seltime.tv_usec < 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000572 seltime.tv_usec += 1000000;
573 seltime.tv_sec--;
574 }
575 } else
Damien Millerc5219e72011-05-05 14:05:12 +1000576 timerclear(&seltime);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000577
Damien Miller07d86be2006-03-26 14:19:21 +1100578 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
579 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
580 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
581 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
Ben Lindstromc1e04212001-03-05 07:04:38 +0000582
583 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
Damien Millerd8968ad2008-07-04 23:10:49 +1000584 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
Ben Lindstromf9452512001-02-15 03:12:08 +0000585 ;
586
Ben Lindstromd20b8552001-03-05 07:01:18 +0000587 for (i = 0; i < maxfd; i++) {
Ben Lindstromc1e04212001-03-05 07:04:38 +0000588 if (FD_ISSET(i, e)) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000589 error("%s: exception!", fdcon[i].c_name);
590 confree(i);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000591 } else if (FD_ISSET(i, r))
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000592 conread(i);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000593 }
Darren Tuckera627d422013-06-02 07:31:17 +1000594 free(r);
595 free(e);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000596
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000597 c = TAILQ_FIRST(&tq);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000598 while (c && (c->c_tv.tv_sec < now.tv_sec ||
599 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000600 int s = c->c_fd;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000601
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000602 c = TAILQ_NEXT(c, c_link);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000603 conrecycle(s);
604 }
605}
606
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000607static void
608do_host(char *host)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000609{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000610 char *name = strnnsep(&host, " \t\n");
611 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000612
Ben Lindstromeaffb9d2001-12-06 16:28:19 +0000613 if (name == NULL)
614 return;
Damien Miller5be9d9e2013-12-07 11:24:01 +1100615 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000616 if (get_keytypes & j) {
617 while (ncon >= MAXCON)
618 conloop();
619 conalloc(name, *host ? host : name, j);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000620 }
621 }
622}
623
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000624void
625fatal(const char *fmt,...)
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000626{
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000627 va_list args;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000628
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000629 va_start(args, fmt);
630 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
631 va_end(args);
markus@openbsd.org3f797652015-01-19 20:32:39 +0000632 exit(255);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000633}
634
635static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000636usage(void)
637{
Damien Millerc1719f72008-11-03 19:27:07 +1100638 fprintf(stderr,
639 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
Darren Tucker7bd98e72010-01-10 10:31:12 +1100640 "\t\t [host | addrlist namelist] ...\n",
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000641 __progname);
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000642 exit(1);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000643}
644
645int
646main(int argc, char **argv)
647{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000648 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
Damien Miller0e76c5e2010-06-26 09:39:59 +1000649 int opt, fopt_count = 0, j;
650 char *tname, *cp, line[NI_MAXHOST];
651 FILE *fp;
652 u_long linenum;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000653
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000654 extern int optind;
655 extern char *optarg;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000656
Damien Miller59d3d5b2003-08-22 09:34:41 +1000657 __progname = ssh_get_progname(argv[0]);
Ben Lindstrom4e088e42001-10-10 20:45:43 +0000658 seed_rng();
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000659 TAILQ_INIT(&tq);
660
Darren Tuckerce321d82005-10-03 18:11:24 +1000661 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
662 sanitise_stdfd();
663
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000664 if (argc <= 1)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000665 usage();
666
Darren Tucker7bd98e72010-01-10 10:31:12 +1100667 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000668 switch (opt) {
Damien Millerdb7b8172005-03-01 21:48:03 +1100669 case 'H':
670 hash_hosts = 1;
671 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000672 case 'p':
673 ssh_port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100674 if (ssh_port <= 0) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000675 fprintf(stderr, "Bad port '%s'\n", optarg);
676 exit(1);
677 }
678 break;
679 case 'T':
Ben Lindstromedd098b2002-07-04 00:07:13 +0000680 timeout = convtime(optarg);
681 if (timeout == -1 || timeout == 0) {
682 fprintf(stderr, "Bad timeout '%s'\n", optarg);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000683 usage();
Ben Lindstromedd098b2002-07-04 00:07:13 +0000684 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000685 break;
686 case 'v':
687 if (!debug_flag) {
688 debug_flag = 1;
689 log_level = SYSLOG_LEVEL_DEBUG1;
690 }
691 else if (log_level < SYSLOG_LEVEL_DEBUG3)
692 log_level++;
693 else
694 fatal("Too high debugging level.");
695 break;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000696 case 'f':
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000697 if (strcmp(optarg, "-") == 0)
698 optarg = NULL;
699 argv[fopt_count++] = optarg;
700 break;
701 case 't':
702 get_keytypes = 0;
703 tname = strtok(optarg, ",");
704 while (tname) {
markus@openbsd.org3f797652015-01-19 20:32:39 +0000705 int type = sshkey_type_from_name(tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000706 switch (type) {
707 case KEY_RSA1:
708 get_keytypes |= KT_RSA1;
709 break;
710 case KEY_DSA:
711 get_keytypes |= KT_DSA;
712 break;
Damien Millereb8b60e2010-08-31 22:41:14 +1000713 case KEY_ECDSA:
714 get_keytypes |= KT_ECDSA;
715 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000716 case KEY_RSA:
717 get_keytypes |= KT_RSA;
718 break;
Damien Miller5be9d9e2013-12-07 11:24:01 +1100719 case KEY_ED25519:
720 get_keytypes |= KT_ED25519;
721 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000722 case KEY_UNSPEC:
Ben Lindstrom28c603b2001-12-06 16:45:10 +0000723 fatal("unknown key type %s", tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000724 }
725 tname = strtok(NULL, ",");
726 }
727 break;
728 case '4':
729 IPv4or6 = AF_INET;
730 break;
731 case '6':
732 IPv4or6 = AF_INET6;
733 break;
734 case '?':
735 default:
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000736 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000737 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000738 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000739 if (optind == argc && !fopt_count)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000740 usage();
741
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000742 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000743
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000744 maxfd = fdlim_get(1);
745 if (maxfd < 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000746 fatal("%s: fdlim_get: bad value", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000747 if (maxfd > MAXMAXFD)
748 maxfd = MAXMAXFD;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000749 if (MAXCON <= 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000750 fatal("%s: not enough file descriptors", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000751 if (maxfd > fdlim_get(0))
752 fdlim_set(maxfd);
Damien Miller07d86be2006-03-26 14:19:21 +1100753 fdcon = xcalloc(maxfd, sizeof(con));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000754
Damien Miller07d86be2006-03-26 14:19:21 +1100755 read_wait_nfdset = howmany(maxfd, NFDBITS);
756 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
Ben Lindstromc1e04212001-03-05 07:04:38 +0000757
Damien Miller0e76c5e2010-06-26 09:39:59 +1000758 for (j = 0; j < fopt_count; j++) {
759 if (argv[j] == NULL)
760 fp = stdin;
761 else if ((fp = fopen(argv[j], "r")) == NULL)
762 fatal("%s: %s: %s", __progname, argv[j],
763 strerror(errno));
764 linenum = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000765
Damien Miller0e76c5e2010-06-26 09:39:59 +1000766 while (read_keyfile_line(fp,
767 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
768 &linenum) != -1) {
769 /* Chomp off trailing whitespace and comments */
770 if ((cp = strchr(line, '#')) == NULL)
771 cp = line + strlen(line) - 1;
772 while (cp >= line) {
773 if (*cp == ' ' || *cp == '\t' ||
774 *cp == '\n' || *cp == '#')
775 *cp-- = '\0';
776 else
777 break;
778 }
779
780 /* Skip empty lines */
781 if (*line == '\0')
Ben Lindstrom78bbd9e2001-09-12 17:10:40 +0000782 continue;
Damien Miller0e76c5e2010-06-26 09:39:59 +1000783
784 do_host(line);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000785 }
Damien Miller0e76c5e2010-06-26 09:39:59 +1000786
787 if (ferror(fp))
788 fatal("%s: %s: %s", __progname, argv[j],
789 strerror(errno));
790
791 fclose(fp);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000792 }
793
794 while (optind < argc)
795 do_host(argv[optind++]);
796
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000797 while (ncon > 0)
798 conloop();
799
800 return (0);
801}