[gssapi-openssh.git] / openssh / ssh-keyscan.c

/*
 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
 *
 * Modification and redistribution in source and binary forms is
 * permitted provided that due credit is given to the author and the
 * OpenBSD project by leaving this copyright notice intact.
 */

#include "includes.h"
RCSID("$OpenBSD: ssh-keyscan.c,v 1.50 2004/08/11 21:44:32 avsm Exp $");

#include "openbsd-compat/sys-queue.h"

#include <openssl/bn.h>

#include <setjmp.h>
#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "key.h"
#include "kex.h"
#include "compat.h"
#include "myproposal.h"
#include "packet.h"
#include "dispatch.h"
#include "buffer.h"
#include "bufaux.h"
#include "log.h"
#include "atomicio.h"
#include "misc.h"

/* Flag indicating whether IPv4 or IPv6.  This can be set on the command line.
   Default value is AF_UNSPEC means both IPv4 and IPv6. */
int IPv4or6 = AF_UNSPEC;

int ssh_port = SSH_DEFAULT_PORT;

#define KT_RSA1	1
#define KT_DSA	2
#define KT_RSA	4

int get_keytypes = KT_RSA1;	/* Get only RSA1 keys by default */

#define MAXMAXFD 256

/* The number of seconds after which to give up on a TCP connection */
int timeout = 5;

int maxfd;
#define MAXCON (maxfd - 10)

extern char *__progname;
fd_set *read_wait;
size_t read_wait_size;
int ncon;
int nonfatal_fatal = 0;
jmp_buf kexjmp;
Key *kexjmp_key;

/*
 * Keep a connection structure for each file descriptor.  The state
 * associated with file descriptor n is held in fdcon[n].
 */
typedef struct Connection {
	u_char c_status;	/* State of connection on this file desc. */
#define CS_UNUSED 0		/* File descriptor unused */
#define CS_CON 1		/* Waiting to connect/read greeting */
#define CS_SIZE 2		/* Waiting to read initial packet size */
#define CS_KEYS 3		/* Waiting to read public key packet */
	int c_fd;		/* Quick lookup: c->c_fd == c - fdcon */
	int c_plen;		/* Packet length field for ssh packet */
	int c_len;		/* Total bytes which must be read. */
	int c_off;		/* Length of data read so far. */
	int c_keytype;		/* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	char *c_namebase;	/* Address to free for c_name and c_namelist */
	char *c_name;		/* Hostname of connection for errors */
	char *c_namelist;	/* Pointer to other possible addresses */
	char *c_output_name;	/* Hostname of connection for output */
	char *c_data;		/* Data read from this fd */
	Kex *c_kex;		/* The key-exchange struct for ssh2 */
	struct timeval c_tv;	/* Time at which connection gets aborted */
	TAILQ_ENTRY(Connection) c_link;	/* List of connections in timeout order. */
} con;

TAILQ_HEAD(conlist, Connection) tq;	/* Timeout Queue */
con *fdcon;

/*
 *  This is just a wrapper around fgets() to make it usable.
 */

/* Stress-test.  Increase this later. */
#define LINEBUF_SIZE 16

typedef struct {
	char *buf;
	u_int size;
	int lineno;
	const char *filename;
	FILE *stream;
	void (*errfun) (const char *,...);
} Linebuf;

static Linebuf *
Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
{
	Linebuf *lb;

	if (!(lb = malloc(sizeof(*lb)))) {
		if (errfun)
			(*errfun) ("linebuf (%s): malloc failed\n",
			    filename ? filename : "(stdin)");
		return (NULL);
	}
	if (filename) {
		lb->filename = filename;
		if (!(lb->stream = fopen(filename, "r"))) {
			xfree(lb);
			if (errfun)
				(*errfun) ("%s: %s\n", filename, strerror(errno));
			return (NULL);
		}
	} else {
		lb->filename = "(stdin)";
		lb->stream = stdin;
	}

	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
		if (errfun)
			(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
		xfree(lb);
		return (NULL);
	}
	lb->errfun = errfun;
	lb->lineno = 0;
	return (lb);
}

static void
Linebuf_free(Linebuf * lb)
{
	fclose(lb->stream);
	xfree(lb->buf);
	xfree(lb);
}

#if 0
static void
Linebuf_restart(Linebuf * lb)
{
	clearerr(lb->stream);
	rewind(lb->stream);
	lb->lineno = 0;
}

static int
Linebuf_lineno(Linebuf * lb)
{
	return (lb->lineno);
}
#endif

static char *
Linebuf_getline(Linebuf * lb)
{
	int n = 0;
	void *p;

	lb->lineno++;
	for (;;) {
		/* Read a line */
		if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
			if (ferror(lb->stream) && lb->errfun)
				(*lb->errfun)("%s: %s\n", lb->filename,
				    strerror(errno));
			return (NULL);
		}
		n = strlen(lb->buf);

		/* Return it or an error if it fits */
		if (n > 0 && lb->buf[n - 1] == '\n') {
			lb->buf[n - 1] = '\0';
			return (lb->buf);
		}
		if (n != lb->size - 1) {
			if (lb->errfun)
				(*lb->errfun)("%s: skipping incomplete last line\n",
				    lb->filename);
			return (NULL);
		}
		/* Double the buffer if we need more space */
		lb->size *= 2;
		if ((p = realloc(lb->buf, lb->size)) == NULL) {
			lb->size /= 2;
			if (lb->errfun)
				(*lb->errfun)("linebuf (%s): realloc failed\n",
				    lb->filename);
			return (NULL);
		}
		lb->buf = p;
	}
}

static int
fdlim_get(int hard)
{
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	struct rlimit rlfd;

	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
		return SSH_SYSFDMAX;
	else
		return hard ? rlfd.rlim_max : rlfd.rlim_cur;
#else
	return SSH_SYSFDMAX;
#endif
}

static int
fdlim_set(int lim)
{
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	struct rlimit rlfd;
#endif

	if (lim <= 0)
		return (-1);
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
	rlfd.rlim_cur = lim;
	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
#elif defined (HAVE_SETDTABLESIZE)
	setdtablesize(lim);
#endif
	return (0);
}

/*
 * This is an strsep function that returns a null field for adjacent
 * separators.  This is the same as the 4.4BSD strsep, but different from the
 * one in the GNU libc.
 */
static char *
xstrsep(char **str, const char *delim)
{
	char *s, *e;

	if (!**str)
		return (NULL);

	s = *str;
	e = s + strcspn(s, delim);

	if (*e != '\0')
		*e++ = '\0';
	*str = e;

	return (s);
}

/*
 * Get the next non-null token (like GNU strsep).  Strsep() will return a
 * null token for two adjacent separators, so we may have to loop.
 */
static char *
strnnsep(char **stringp, char *delim)
{
	char *tok;

	do {
		tok = xstrsep(stringp, delim);
	} while (tok && *tok == '\0');
	return (tok);
}

static Key *
keygrab_ssh1(con *c)
{
	static Key *rsa;
	static Buffer msg;

	if (rsa == NULL) {
		buffer_init(&msg);
		rsa = key_new(KEY_RSA1);
	}
	buffer_append(&msg, c->c_data, c->c_plen);
	buffer_consume(&msg, 8 - (c->c_plen & 7));	/* padding */
	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
		error("%s: invalid packet type", c->c_name);
		buffer_clear(&msg);
		return NULL;
	}
	buffer_consume(&msg, 8);		/* cookie */

	/* server key */
	(void) buffer_get_int(&msg);
	buffer_get_bignum(&msg, rsa->rsa->e);
	buffer_get_bignum(&msg, rsa->rsa->n);

	/* host key */
	(void) buffer_get_int(&msg);
	buffer_get_bignum(&msg, rsa->rsa->e);
	buffer_get_bignum(&msg, rsa->rsa->n);

	buffer_clear(&msg);

	return (rsa);
}

static int
hostjump(Key *hostkey)
{
	kexjmp_key = hostkey;
	longjmp(kexjmp, 1);
}

static int
ssh2_capable(int remote_major, int remote_minor)
{
	switch (remote_major) {
	case 1:
		if (remote_minor == 99)
			return 1;
		break;
	case 2:
		return 1;
	default:
		break;
	}
	return 0;
}

static Key *
keygrab_ssh2(con *c)
{
	int j;

	packet_set_connection(c->c_fd, c->c_fd);
	enable_compat20();
	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
	    "ssh-dss": "ssh-rsa";
	c->c_kex = kex_setup(myproposal);
	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
	c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
	c->c_kex->verify_host_key = hostjump;

	if (!(j = setjmp(kexjmp))) {
		nonfatal_fatal = 1;
		dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
		fprintf(stderr, "Impossible! dispatch_run() returned!\n");
		exit(1);
	}
	nonfatal_fatal = 0;
	xfree(c->c_kex);
	c->c_kex = NULL;
	packet_close();

	return j < 0? NULL : kexjmp_key;
}

static void
keyprint(con *c, Key *key)
{
	if (!key)
		return;

	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
	key_write(key, stdout);
	fputs("\n", stdout);
}

static int
tcpconnect(char *host)
{
	struct addrinfo hints, *ai, *aitop;
	char strport[NI_MAXSERV];
	int gaierr, s = -1;

	snprintf(strport, sizeof strport, "%d", ssh_port);
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = IPv4or6;
	hints.ai_socktype = SOCK_STREAM;
	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
		fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	for (ai = aitop; ai; ai = ai->ai_next) {
		s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
		if (s < 0) {
			error("socket: %s", strerror(errno));
			continue;
		}
		if (set_nonblock(s) == -1)
			fatal("%s: set_nonblock(%d)", __func__, s);
		if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
		    errno != EINPROGRESS)
			error("connect (`%s'): %s", host, strerror(errno));
		else
			break;
		close(s);
		s = -1;
	}
	freeaddrinfo(aitop);
	return s;
}

static int
conalloc(char *iname, char *oname, int keytype)
{
	char *namebase, *name, *namelist;
	int s;

	namebase = namelist = xstrdup(iname);

	do {
		name = xstrsep(&namelist, ",");
		if (!name) {
			xfree(namebase);
			return (-1);
		}
	} while ((s = tcpconnect(name)) < 0);

	if (s >= maxfd)
		fatal("conalloc: fdno %d too high", s);
	if (fdcon[s].c_status)
		fatal("conalloc: attempt to reuse fdno %d", s);

	fdcon[s].c_fd = s;
	fdcon[s].c_status = CS_CON;
	fdcon[s].c_namebase = namebase;
	fdcon[s].c_name = name;
	fdcon[s].c_namelist = namelist;
	fdcon[s].c_output_name = xstrdup(oname);
	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	fdcon[s].c_len = 4;
	fdcon[s].c_off = 0;
	fdcon[s].c_keytype = keytype;
	gettimeofday(&fdcon[s].c_tv, NULL);
	fdcon[s].c_tv.tv_sec += timeout;
	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	FD_SET(s, read_wait);
	ncon++;
	return (s);
}

static void
confree(int s)
{
	if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
		fatal("confree: attempt to free bad fdno %d", s);
	close(s);
	xfree(fdcon[s].c_namebase);
	xfree(fdcon[s].c_output_name);
	if (fdcon[s].c_status == CS_KEYS)
		xfree(fdcon[s].c_data);
	fdcon[s].c_status = CS_UNUSED;
	fdcon[s].c_keytype = 0;
	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	FD_CLR(s, read_wait);
	ncon--;
}

static void
contouch(int s)
{
	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	gettimeofday(&fdcon[s].c_tv, NULL);
	fdcon[s].c_tv.tv_sec += timeout;
	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
}

static int
conrecycle(int s)
{
	con *c = &fdcon[s];
	int ret;

	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	confree(s);
	return (ret);
}

static void
congreet(int s)
{
	int remote_major = 0, remote_minor = 0, n = 0;
	char buf[256], *cp;
	char remote_version[sizeof buf];
	size_t bufsiz;
	con *c = &fdcon[s];

	bufsiz = sizeof(buf);
	cp = buf;
	while (bufsiz-- && (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
		if (*cp == '\r')
			*cp = '\n';
		cp++;
	}
	if (n < 0) {
		if (errno != ECONNREFUSED)
			error("read (%s): %s", c->c_name, strerror(errno));
		conrecycle(s);
		return;
	}
	if (n == 0) {
		error("%s: Connection closed by remote host", c->c_name);
		conrecycle(s);
		return;
	}
	if (*cp != '\n' && *cp != '\r') {
		error("%s: bad greeting", c->c_name);
		confree(s);
		return;
	}
	*cp = '\0';
	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	    &remote_major, &remote_minor, remote_version) == 3)
		compat_datafellows(remote_version);
	else
		datafellows = 0;
	if (c->c_keytype != KT_RSA1) {
		if (!ssh2_capable(remote_major, remote_minor)) {
			debug("%s doesn't support ssh2", c->c_name);
			confree(s);
			return;
		}
	} else if (remote_major != 1) {
		debug("%s doesn't support ssh1", c->c_name);
		confree(s);
		return;
	}
	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	    c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	    c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
	if (atomicio(vwrite, s, buf, n) != n) {
		error("write (%s): %s", c->c_name, strerror(errno));
		confree(s);
		return;
	}
	if (c->c_keytype != KT_RSA1) {
		keyprint(c, keygrab_ssh2(c));
		confree(s);
		return;
	}
	c->c_status = CS_SIZE;
	contouch(s);
}

static void
conread(int s)
{
	con *c = &fdcon[s];
	int n;

	if (c->c_status == CS_CON) {
		congreet(s);
		return;
	}
	n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
	if (n < 0) {
		error("read (%s): %s", c->c_name, strerror(errno));
		confree(s);
		return;
	}
	c->c_off += n;

	if (c->c_off == c->c_len)
		switch (c->c_status) {
		case CS_SIZE:
			c->c_plen = htonl(c->c_plen);
			c->c_len = c->c_plen + 8 - (c->c_plen & 7);
			c->c_off = 0;
			c->c_data = xmalloc(c->c_len);
			c->c_status = CS_KEYS;
			break;
		case CS_KEYS:
			keyprint(c, keygrab_ssh1(c));
			confree(s);
			return;
			break;
		default:
			fatal("conread: invalid status %d", c->c_status);
			break;
		}

	contouch(s);
}

static void
conloop(void)
{
	struct timeval seltime, now;
	fd_set *r, *e;
	con *c;
	int i;

	gettimeofday(&now, NULL);
	c = TAILQ_FIRST(&tq);

	if (c && (c->c_tv.tv_sec > now.tv_sec ||
	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
		seltime = c->c_tv;
		seltime.tv_sec -= now.tv_sec;
		seltime.tv_usec -= now.tv_usec;
		if (seltime.tv_usec < 0) {
			seltime.tv_usec += 1000000;
			seltime.tv_sec--;
		}
	} else
		seltime.tv_sec = seltime.tv_usec = 0;

	r = xmalloc(read_wait_size);
	memcpy(r, read_wait, read_wait_size);
	e = xmalloc(read_wait_size);
	memcpy(e, read_wait, read_wait_size);

	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	    (errno == EAGAIN || errno == EINTR))
		;

	for (i = 0; i < maxfd; i++) {
		if (FD_ISSET(i, e)) {
			error("%s: exception!", fdcon[i].c_name);
			confree(i);
		} else if (FD_ISSET(i, r))
			conread(i);
	}
	xfree(r);
	xfree(e);

	c = TAILQ_FIRST(&tq);
	while (c && (c->c_tv.tv_sec < now.tv_sec ||
	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
		int s = c->c_fd;

		c = TAILQ_NEXT(c, c_link);
		conrecycle(s);
	}
}

static void
do_host(char *host)
{
	char *name = strnnsep(&host, " \t\n");
	int j;

	if (name == NULL)
		return;
	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
		if (get_keytypes & j) {
			while (ncon >= MAXCON)
				conloop();
			conalloc(name, *host ? host : name, j);
		}
	}
}

void
fatal(const char *fmt,...)
{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	va_end(args);
	if (nonfatal_fatal)
		longjmp(kexjmp, -1);
	else
		exit(255);
}

static void
usage(void)
{
	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-t type] [-f file]\n"
	    "\t\t   [host | addrlist namelist] [...]\n",
	    __progname);
	exit(1);
}

int
main(int argc, char **argv)
{
	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	int opt, fopt_count = 0;
	char *tname;

	extern int optind;
	extern char *optarg;

	__progname = ssh_get_progname(argv[0]);
	init_rng();
	seed_rng();
	TAILQ_INIT(&tq);

	if (argc <= 1)
		usage();

	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
		switch (opt) {
		case 'p':
			ssh_port = a2port(optarg);
			if (ssh_port == 0) {
				fprintf(stderr, "Bad port '%s'\n", optarg);
				exit(1);
			}
			break;
		case 'T':
			timeout = convtime(optarg);
			if (timeout == -1 || timeout == 0) {
				fprintf(stderr, "Bad timeout '%s'\n", optarg);
				usage();
			}
			break;
		case 'v':
			if (!debug_flag) {
				debug_flag = 1;
				log_level = SYSLOG_LEVEL_DEBUG1;
			}
			else if (log_level < SYSLOG_LEVEL_DEBUG3)
				log_level++;
			else
				fatal("Too high debugging level.");
			break;
		case 'f':
			if (strcmp(optarg, "-") == 0)
				optarg = NULL;
			argv[fopt_count++] = optarg;
			break;
		case 't':
			get_keytypes = 0;
			tname = strtok(optarg, ",");
			while (tname) {
				int type = key_type_from_name(tname);
				switch (type) {
				case KEY_RSA1:
					get_keytypes |= KT_RSA1;
					break;
				case KEY_DSA:
					get_keytypes |= KT_DSA;
					break;
				case KEY_RSA:
					get_keytypes |= KT_RSA;
					break;
				case KEY_UNSPEC:
					fatal("unknown key type %s", tname);
				}
				tname = strtok(NULL, ",");
			}
			break;
		case '4':
			IPv4or6 = AF_INET;
			break;
		case '6':
			IPv4or6 = AF_INET6;
			break;
		case '?':
		default:
			usage();
		}
	}
	if (optind == argc && !fopt_count)
		usage();

	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);

	maxfd = fdlim_get(1);
	if (maxfd < 0)
		fatal("%s: fdlim_get: bad value", __progname);
	if (maxfd > MAXMAXFD)
		maxfd = MAXMAXFD;
	if (MAXCON <= 0)
		fatal("%s: not enough file descriptors", __progname);
	if (maxfd > fdlim_get(0))
		fdlim_set(maxfd);
	fdcon = xmalloc(maxfd * sizeof(con));
	memset(fdcon, 0, maxfd * sizeof(con));

	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	read_wait = xmalloc(read_wait_size);
	memset(read_wait, 0, read_wait_size);

	if (fopt_count) {
		Linebuf *lb;
		char *line;
		int j;

		for (j = 0; j < fopt_count; j++) {
			lb = Linebuf_alloc(argv[j], error);
			if (!lb)
				continue;
			while ((line = Linebuf_getline(lb)) != NULL)
				do_host(line);
			Linebuf_free(lb);
		}
	}

	while (optind < argc)
		do_host(argv[optind++]);

	while (ncon > 0)
		conloop();

	return (0);
}
Commit	Line	Data
3c0ef626	1	/*
	2	* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
	3	*
	4	* Modification and redistribution in source and binary forms is
	5	* permitted provided that due credit is given to the author and the
	6	* OpenBSD project by leaving this copyright notice intact.
	7	*/
	8
	9	#include "includes.h"
c9f39d2c	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.50 2004/08/11 21:44:32 avsm Exp $");
3c0ef626	11
41b2f314	12	#include "openbsd-compat/sys-queue.h"
3c0ef626	13
	14	#include <openssl/bn.h>
	15
	16	#include <setjmp.h>
	17	#include "xmalloc.h"
	18	#include "ssh.h"
	19	#include "ssh1.h"
	20	#include "key.h"
	21	#include "kex.h"
	22	#include "compat.h"
	23	#include "myproposal.h"
	24	#include "packet.h"
	25	#include "dispatch.h"
	26	#include "buffer.h"
	27	#include "bufaux.h"
	28	#include "log.h"
	29	#include "atomicio.h"
	30	#include "misc.h"
	31
	32	/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
	33	Default value is AF_UNSPEC means both IPv4 and IPv6. */
3c0ef626	34	int IPv4or6 = AF_UNSPEC;
3c0ef626	35
	36	int ssh_port = SSH_DEFAULT_PORT;
	37
	38	#define KT_RSA1 1
	39	#define KT_DSA 2
	40	#define KT_RSA 4
	41
	42	int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
	43
	44	#define MAXMAXFD 256
	45
	46	/* The number of seconds after which to give up on a TCP connection */
	47	int timeout = 5;
	48
	49	int maxfd;
	50	#define MAXCON (maxfd - 10)
	51
3c0ef626	52	extern char *__progname;
3c0ef626	53	fd_set *read_wait;
	54	size_t read_wait_size;
	55	int ncon;
	56	int nonfatal_fatal = 0;
	57	jmp_buf kexjmp;
	58	Key *kexjmp_key;
	59
	60	/*
	61	* Keep a connection structure for each file descriptor. The state
	62	* associated with file descriptor n is held in fdcon[n].
	63	*/
	64	typedef struct Connection {
	65	u_char c_status; /* State of connection on this file desc. */
	66	#define CS_UNUSED 0 /* File descriptor unused */
	67	#define CS_CON 1 /* Waiting to connect/read greeting */
	68	#define CS_SIZE 2 /* Waiting to read initial packet size */
	69	#define CS_KEYS 3 /* Waiting to read public key packet */
	70	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	71	int c_plen; /* Packet length field for ssh packet */
	72	int c_len; /* Total bytes which must be read. */
	73	int c_off; /* Length of data read so far. */
	74	int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	75	char c_namebase; / Address to free for c_name and c_namelist */
	76	char c_name; / Hostname of connection for errors */
	77	char c_namelist; / Pointer to other possible addresses */
	78	char c_output_name; / Hostname of connection for output */
	79	char c_data; / Data read from this fd */
	80	Kex c_kex; / The key-exchange struct for ssh2 */
	81	struct timeval c_tv; /* Time at which connection gets aborted */
	82	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	83	} con;
	84
	85	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	86	con *fdcon;
	87
	88	/*
	89	* This is just a wrapper around fgets() to make it usable.
	90	*/
	91
	92	/* Stress-test. Increase this later. */
	93	#define LINEBUF_SIZE 16
	94
	95	typedef struct {
	96	char *buf;
	97	u_int size;
	98	int lineno;
	99	const char *filename;
	100	FILE *stream;
	101	void (errfun) (const char ,...);
	102	} Linebuf;
	103
	104	static Linebuf *
	105	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
	106	{
	107	Linebuf *lb;
	108
	109	if (!(lb = malloc(sizeof(*lb)))) {
	110	if (errfun)
41b2f314	111	(*errfun) ("linebuf (%s): malloc failed\n",
41b2f314	112	filename ? filename : "(stdin)");
3c0ef626	113	return (NULL);
	114	}
	115	if (filename) {
	116	lb->filename = filename;
	117	if (!(lb->stream = fopen(filename, "r"))) {
	118	xfree(lb);
	119	if (errfun)
	120	(*errfun) ("%s: %s\n", filename, strerror(errno));
	121	return (NULL);
	122	}
	123	} else {
	124	lb->filename = "(stdin)";
	125	lb->stream = stdin;
	126	}
	127
	128	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	129	if (errfun)
	130	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	131	xfree(lb);
	132	return (NULL);
	133	}
	134	lb->errfun = errfun;
	135	lb->lineno = 0;
	136	return (lb);
	137	}
	138
	139	static void
	140	Linebuf_free(Linebuf * lb)
	141	{
	142	fclose(lb->stream);
	143	xfree(lb->buf);
	144	xfree(lb);
	145	}
	146
	147	#if 0
	148	static void
	149	Linebuf_restart(Linebuf * lb)
	150	{
	151	clearerr(lb->stream);
	152	rewind(lb->stream);
	153	lb->lineno = 0;
	154	}
	155
	156	static int
	157	Linebuf_lineno(Linebuf * lb)
	158	{
	159	return (lb->lineno);
	160	}
	161	#endif
	162
	163	static char *
	164	Linebuf_getline(Linebuf * lb)
	165	{
	166	int n = 0;
41b2f314	167	void *p;
3c0ef626	168
	169	lb->lineno++;
	170	for (;;) {
	171	/* Read a line */
	172	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	173	if (ferror(lb->stream) && lb->errfun)
41b2f314	174	(*lb->errfun)("%s: %s\n", lb->filename,
3c0ef626	175	strerror(errno));
	176	return (NULL);
	177	}
	178	n = strlen(lb->buf);
	179
	180	/* Return it or an error if it fits */
	181	if (n > 0 && lb->buf[n - 1] == '\n') {
	182	lb->buf[n - 1] = '\0';
	183	return (lb->buf);
	184	}
	185	if (n != lb->size - 1) {
	186	if (lb->errfun)
41b2f314	187	(*lb->errfun)("%s: skipping incomplete last line\n",
3c0ef626	188	lb->filename);
	189	return (NULL);
	190	}
	191	/* Double the buffer if we need more space */
41b2f314	192	lb->size *= 2;
	193	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	194	lb->size /= 2;
3c0ef626	195	if (lb->errfun)
41b2f314	196	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	197	lb->filename);
	198	return (NULL);
	199	}
41b2f314	200	lb->buf = p;
3c0ef626	201	}
	202	}
	203
	204	static int
	205	fdlim_get(int hard)
	206	{
	207	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	208	struct rlimit rlfd;
	209
	210	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	211	return (-1);
	212	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
cdd66111	213	return SSH_SYSFDMAX;
3c0ef626	214	else
3c0ef626	215	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
3c0ef626	216	#else
cdd66111	217	return SSH_SYSFDMAX;
3c0ef626	218	#endif
	219	}
	220
	221	static int
	222	fdlim_set(int lim)
	223	{
	224	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	225	struct rlimit rlfd;
	226	#endif
41b2f314	227
3c0ef626	228	if (lim <= 0)
	229	return (-1);
	230	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	231	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	232	return (-1);
	233	rlfd.rlim_cur = lim;
	234	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	235	return (-1);
	236	#elif defined (HAVE_SETDTABLESIZE)
	237	setdtablesize(lim);
	238	#endif
	239	return (0);
	240	}
	241
	242	/*
	243	* This is an strsep function that returns a null field for adjacent
	244	* separators. This is the same as the 4.4BSD strsep, but different from the
	245	* one in the GNU libc.
	246	*/
	247	static char *
	248	xstrsep(char *str, const char delim)
	249	{
	250	char s, e;
	251
	252	if (!**str)
	253	return (NULL);
	254
	255	s = *str;
	256	e = s + strcspn(s, delim);
	257
	258	if (*e != '\0')
	259	*e++ = '\0';
	260	*str = e;
	261
	262	return (s);
	263	}
	264
	265	/*
	266	* Get the next non-null token (like GNU strsep). Strsep() will return a
	267	* null token for two adjacent separators, so we may have to loop.
	268	*/
	269	static char *
	270	strnnsep(char *stringp, char delim)
	271	{
	272	char *tok;
	273
	274	do {
	275	tok = xstrsep(stringp, delim);
	276	} while (tok && *tok == '\0');
	277	return (tok);
	278	}
	279
	280	static Key *
	281	keygrab_ssh1(con *c)
	282	{
	283	static Key *rsa;
	284	static Buffer msg;
	285
	286	if (rsa == NULL) {
	287	buffer_init(&msg);
	288	rsa = key_new(KEY_RSA1);
	289	}
	290	buffer_append(&msg, c->c_data, c->c_plen);
	291	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
292	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
293	error("%s: invalid packet type", c->c_name);
294	buffer_clear(&msg);
295	return NULL;
296	}
297	buffer_consume(&msg, 8); /* cookie */
298
299	/* server key */
300	(void) buffer_get_int(&msg);
301	buffer_get_bignum(&msg, rsa->rsa->e);
302	buffer_get_bignum(&msg, rsa->rsa->n);
303
304	/* host key */
305	(void) buffer_get_int(&msg);
306	buffer_get_bignum(&msg, rsa->rsa->e);
307	buffer_get_bignum(&msg, rsa->rsa->n);
308
309	buffer_clear(&msg);
310
311	return (rsa);
312	}
313
314	static int
315	hostjump(Key *hostkey)
316	{
317	kexjmp_key = hostkey;
318	longjmp(kexjmp, 1);
319	}
320
321	static int
322	ssh2_capable(int remote_major, int remote_minor)
323	{
324	switch (remote_major) {
325	case 1:
326	if (remote_minor == 99)
327	return 1;
328	break;
329	case 2:
330	return 1;
331	default:
332	break;
333	}
334	return 0;
335	}
336
337	static Key *
338	keygrab_ssh2(con *c)
339	{
340	int j;
341
342	packet_set_connection(c->c_fd, c->c_fd);
343	enable_compat20();
344	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
345	"ssh-dss": "ssh-rsa";
346	c->c_kex = kex_setup(myproposal);
6a9b3198	347	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
c9f39d2c	348	c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
6a9b3198	349	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
3c0ef626	350	c->c_kex->verify_host_key = hostjump;
	351
	352	if (!(j = setjmp(kexjmp))) {
	353	nonfatal_fatal = 1;
	354	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
	355	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
	356	exit(1);
	357	}
	358	nonfatal_fatal = 0;
	359	xfree(c->c_kex);
	360	c->c_kex = NULL;
	361	packet_close();
	362
	363	return j < 0? NULL : kexjmp_key;
	364	}
	365
	366	static void
	367	keyprint(con c, Key key)
	368	{
	369	if (!key)
	370	return;
	371
	372	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
	373	key_write(key, stdout);
	374	fputs("\n", stdout);
	375	}
	376
	377	static int
	378	tcpconnect(char *host)
	379	{
	380	struct addrinfo hints, ai, aitop;
	381	char strport[NI_MAXSERV];
	382	int gaierr, s = -1;
	383
	384	snprintf(strport, sizeof strport, "%d", ssh_port);
	385	memset(&hints, 0, sizeof(hints));
	386	hints.ai_family = IPv4or6;
	387	hints.ai_socktype = SOCK_STREAM;
	388	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	389	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	390	for (ai = aitop; ai; ai = ai->ai_next) {
0fff78ff	391	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
3c0ef626	392	if (s < 0) {
	393	error("socket: %s", strerror(errno));
	394	continue;
	395	}
c9f39d2c	396	if (set_nonblock(s) == -1)
c9f39d2c	397	fatal("%s: set_nonblock(%d)", __func__, s);
3c0ef626	398	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	399	errno != EINPROGRESS)
	400	error("connect (`%s'): %s", host, strerror(errno));
	401	else
	402	break;
	403	close(s);
	404	s = -1;
	405	}
	406	freeaddrinfo(aitop);
	407	return s;
	408	}
	409
	410	static int
	411	conalloc(char iname, char oname, int keytype)
	412	{
3c0ef626	413	char namebase, name, *namelist;
41b2f314	414	int s;
3c0ef626	415
	416	namebase = namelist = xstrdup(iname);
	417
	418	do {
	419	name = xstrsep(&namelist, ",");
	420	if (!name) {
	421	xfree(namebase);
	422	return (-1);
	423	}
	424	} while ((s = tcpconnect(name)) < 0);
	425
	426	if (s >= maxfd)
	427	fatal("conalloc: fdno %d too high", s);
	428	if (fdcon[s].c_status)
	429	fatal("conalloc: attempt to reuse fdno %d", s);
	430
	431	fdcon[s].c_fd = s;
	432	fdcon[s].c_status = CS_CON;
	433	fdcon[s].c_namebase = namebase;
	434	fdcon[s].c_name = name;
	435	fdcon[s].c_namelist = namelist;
	436	fdcon[s].c_output_name = xstrdup(oname);
	437	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	438	fdcon[s].c_len = 4;
	439	fdcon[s].c_off = 0;
	440	fdcon[s].c_keytype = keytype;
	441	gettimeofday(&fdcon[s].c_tv, NULL);
	442	fdcon[s].c_tv.tv_sec += timeout;
	443	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	444	FD_SET(s, read_wait);
	445	ncon++;
	446	return (s);
	447	}
	448
	449	static void
	450	confree(int s)
	451	{
	452	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	453	fatal("confree: attempt to free bad fdno %d", s);
	454	close(s);
	455	xfree(fdcon[s].c_namebase);
	456	xfree(fdcon[s].c_output_name);
	457	if (fdcon[s].c_status == CS_KEYS)
	458	xfree(fdcon[s].c_data);
	459	fdcon[s].c_status = CS_UNUSED;
	460	fdcon[s].c_keytype = 0;
	461	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	462	FD_CLR(s, read_wait);
	463	ncon--;
	464	}
	465
	466	static void
	467	contouch(int s)
	468	{
	469	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	470	gettimeofday(&fdcon[s].c_tv, NULL);
	471	fdcon[s].c_tv.tv_sec += timeout;
	472	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	473	}
	474
	475	static int
	476	conrecycle(int s)
	477	{
3c0ef626	478	con *c = &fdcon[s];
41b2f314	479	int ret;
3c0ef626	480
	481	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	482	confree(s);
	483	return (ret);
	484	}
	485
	486	static void
	487	congreet(int s)
	488	{
99be0775	489	int remote_major = 0, remote_minor = 0, n = 0;
3c0ef626	490	char buf[256], *cp;
e9a17296	491	char remote_version[sizeof buf];
3c0ef626	492	size_t bufsiz;
3c0ef626	493	con *c = &fdcon[s];
	494
	495	bufsiz = sizeof(buf);
	496	cp = buf;
c9f39d2c	497	while (bufsiz-- && (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
3c0ef626	498	if (*cp == '\r')
	499	*cp = '\n';
	500	cp++;
	501	}
	502	if (n < 0) {
	503	if (errno != ECONNREFUSED)
	504	error("read (%s): %s", c->c_name, strerror(errno));
	505	conrecycle(s);
	506	return;
	507	}
e9a17296	508	if (n == 0) {
	509	error("%s: Connection closed by remote host", c->c_name);
	510	conrecycle(s);
	511	return;
	512	}
3c0ef626	513	if (cp != '\n' && cp != '\r') {
	514	error("%s: bad greeting", c->c_name);
	515	confree(s);
	516	return;
	517	}
	518	*cp = '\0';
e9a17296	519	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	520	&remote_major, &remote_minor, remote_version) == 3)
	521	compat_datafellows(remote_version);
	522	else
	523	datafellows = 0;
3c0ef626	524	if (c->c_keytype != KT_RSA1) {
3c0ef626	525	if (!ssh2_capable(remote_major, remote_minor)) {
	526	debug("%s doesn't support ssh2", c->c_name);
	527	confree(s);
	528	return;
	529	}
e9a17296	530	} else if (remote_major != 1) {
	531	debug("%s doesn't support ssh1", c->c_name);
	532	confree(s);
	533	return;
3c0ef626	534	}
	535	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	536	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	537	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	538	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
0fff78ff	539	if (atomicio(vwrite, s, buf, n) != n) {
3c0ef626	540	error("write (%s): %s", c->c_name, strerror(errno));
	541	confree(s);
	542	return;
	543	}
	544	if (c->c_keytype != KT_RSA1) {
	545	keyprint(c, keygrab_ssh2(c));
	546	confree(s);
	547	return;
	548	}
	549	c->c_status = CS_SIZE;
	550	contouch(s);
	551	}
	552
	553	static void
	554	conread(int s)
	555	{
3c0ef626	556	con *c = &fdcon[s];
41b2f314	557	int n;
3c0ef626	558
	559	if (c->c_status == CS_CON) {
	560	congreet(s);
	561	return;
	562	}
c9f39d2c	563	n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
3c0ef626	564	if (n < 0) {
	565	error("read (%s): %s", c->c_name, strerror(errno));
	566	confree(s);
	567	return;
	568	}
	569	c->c_off += n;
	570
	571	if (c->c_off == c->c_len)
	572	switch (c->c_status) {
	573	case CS_SIZE:
	574	c->c_plen = htonl(c->c_plen);
	575	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	576	c->c_off = 0;
	577	c->c_data = xmalloc(c->c_len);
	578	c->c_status = CS_KEYS;
	579	break;
	580	case CS_KEYS:
	581	keyprint(c, keygrab_ssh1(c));
	582	confree(s);
	583	return;
	584	break;
	585	default:
	586	fatal("conread: invalid status %d", c->c_status);
	587	break;
	588	}
	589
	590	contouch(s);
	591	}
	592
	593	static void
	594	conloop(void)
	595	{
3c0ef626	596	struct timeval seltime, now;
41b2f314	597	fd_set r, e;
3c0ef626	598	con *c;
41b2f314	599	int i;
3c0ef626	600
3c0ef626	601	gettimeofday(&now, NULL);
f5799ae1	602	c = TAILQ_FIRST(&tq);
3c0ef626	603
	604	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	605	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	606	seltime = c->c_tv;
	607	seltime.tv_sec -= now.tv_sec;
	608	seltime.tv_usec -= now.tv_usec;
	609	if (seltime.tv_usec < 0) {
	610	seltime.tv_usec += 1000000;
	611	seltime.tv_sec--;
	612	}
	613	} else
	614	seltime.tv_sec = seltime.tv_usec = 0;
	615
	616	r = xmalloc(read_wait_size);
	617	memcpy(r, read_wait, read_wait_size);
	618	e = xmalloc(read_wait_size);
	619	memcpy(e, read_wait, read_wait_size);
	620
	621	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	622	(errno == EAGAIN \|\| errno == EINTR))
	623	;
	624
	625	for (i = 0; i < maxfd; i++) {
	626	if (FD_ISSET(i, e)) {
	627	error("%s: exception!", fdcon[i].c_name);
	628	confree(i);
	629	} else if (FD_ISSET(i, r))
	630	conread(i);
	631	}
	632	xfree(r);
	633	xfree(e);
	634
f5799ae1	635	c = TAILQ_FIRST(&tq);
3c0ef626	636	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	637	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	638	int s = c->c_fd;
	639
f5799ae1	640	c = TAILQ_NEXT(c, c_link);
3c0ef626	641	conrecycle(s);
	642	}
	643	}
	644
	645	static void
	646	do_host(char *host)
	647	{
	648	char *name = strnnsep(&host, " \t\n");
	649	int j;
	650
e9a17296	651	if (name == NULL)
e9a17296	652	return;
3c0ef626	653	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	654	if (get_keytypes & j) {
	655	while (ncon >= MAXCON)
	656	conloop();
	657	conalloc(name, *host ? host : name, j);
	658	}
	659	}
	660	}
	661
e9a17296	662	void
e9a17296	663	fatal(const char *fmt,...)
3c0ef626	664	{
e9a17296	665	va_list args;
41b2f314	666
e9a17296	667	va_start(args, fmt);
	668	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	669	va_end(args);
3c0ef626	670	if (nonfatal_fatal)
3c0ef626	671	longjmp(kexjmp, -1);
e9a17296	672	else
cdd66111	673	exit(255);
3c0ef626	674	}
	675
	676	static void
	677	usage(void)
	678	{
0fff78ff	679	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-t type] [-f file]\n"
41b2f314	680	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	681	__progname);
3c0ef626	682	exit(1);
	683	}
	684
	685	int
	686	main(int argc, char **argv)
	687	{
	688	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	689	int opt, fopt_count = 0;
	690	char *tname;
	691
	692	extern int optind;
	693	extern char *optarg;
	694
0fff78ff	695	__progname = ssh_get_progname(argv[0]);
3c0ef626	696	init_rng();
	697	seed_rng();
	698	TAILQ_INIT(&tq);
	699
	700	if (argc <= 1)
	701	usage();
	702
	703	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
	704	switch (opt) {
	705	case 'p':
	706	ssh_port = a2port(optarg);
	707	if (ssh_port == 0) {
	708	fprintf(stderr, "Bad port '%s'\n", optarg);
	709	exit(1);
	710	}
	711	break;
	712	case 'T':
41b2f314	713	timeout = convtime(optarg);
	714	if (timeout == -1 \|\| timeout == 0) {
	715	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	716	usage();
41b2f314	717	}
3c0ef626	718	break;
	719	case 'v':
	720	if (!debug_flag) {
	721	debug_flag = 1;
	722	log_level = SYSLOG_LEVEL_DEBUG1;
	723	}
	724	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	725	log_level++;
	726	else
	727	fatal("Too high debugging level.");
	728	break;
	729	case 'f':
	730	if (strcmp(optarg, "-") == 0)
	731	optarg = NULL;
	732	argv[fopt_count++] = optarg;
	733	break;
	734	case 't':
	735	get_keytypes = 0;
	736	tname = strtok(optarg, ",");
	737	while (tname) {
	738	int type = key_type_from_name(tname);
	739	switch (type) {
	740	case KEY_RSA1:
	741	get_keytypes \|= KT_RSA1;
	742	break;
	743	case KEY_DSA:
	744	get_keytypes \|= KT_DSA;
	745	break;
	746	case KEY_RSA:
	747	get_keytypes \|= KT_RSA;
	748	break;
	749	case KEY_UNSPEC:
e9a17296	750	fatal("unknown key type %s", tname);
3c0ef626	751	}
	752	tname = strtok(NULL, ",");
	753	}
	754	break;
	755	case '4':
	756	IPv4or6 = AF_INET;
	757	break;
	758	case '6':
	759	IPv4or6 = AF_INET6;
	760	break;
	761	case '?':
	762	default:
	763	usage();
	764	}
	765	}
	766	if (optind == argc && !fopt_count)
	767	usage();
	768
	769	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	770
	771	maxfd = fdlim_get(1);
	772	if (maxfd < 0)
	773	fatal("%s: fdlim_get: bad value", __progname);
	774	if (maxfd > MAXMAXFD)
	775	maxfd = MAXMAXFD;
	776	if (MAXCON <= 0)
	777	fatal("%s: not enough file descriptors", __progname);
	778	if (maxfd > fdlim_get(0))
	779	fdlim_set(maxfd);
	780	fdcon = xmalloc(maxfd * sizeof(con));
	781	memset(fdcon, 0, maxfd * sizeof(con));
	782
	783	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	784	read_wait = xmalloc(read_wait_size);
	785	memset(read_wait, 0, read_wait_size);
	786
	787	if (fopt_count) {
	788	Linebuf *lb;
	789	char *line;
	790	int j;
	791
	792	for (j = 0; j < fopt_count; j++) {
	793	lb = Linebuf_alloc(argv[j], error);
	794	if (!lb)
	795	continue;
	796	while ((line = Linebuf_getline(lb)) != NULL)
	797	do_host(line);
	798	Linebuf_free(lb);
	799	}
	800	}
	801
	802	while (optind < argc)
	803	do_host(argv[optind++]);
	804
	805	while (ncon > 0)
	806	conloop();
	807
	808	return (0);
	809	}