[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 1.44 2003/06/28 16:23:06 deraadt 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)

#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif
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 10000;
	else
		return hard ? rlfd.rlim_max : rlfd.rlim_cur;
#elif defined (HAVE_SYSCONF)
	return sysconf (_SC_OPEN_MAX);
#else
	return 10000;
#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_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 (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
			fatal("F_SETFL: %s", strerror(errno));
		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, remote_minor, 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 = 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 = 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
		fatal_cleanup();
}

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"
9cb1827b	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.44 2003/06/28 16:23:06 deraadt 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
	52	#ifdef HAVE___PROGNAME
	53	extern char *__progname;
	54	#else
	55	char *__progname;
	56	#endif
	57	fd_set *read_wait;
	58	size_t read_wait_size;
	59	int ncon;
	60	int nonfatal_fatal = 0;
	61	jmp_buf kexjmp;
	62	Key *kexjmp_key;
	63
	64	/*
	65	* Keep a connection structure for each file descriptor. The state
	66	* associated with file descriptor n is held in fdcon[n].
	67	*/
	68	typedef struct Connection {
	69	u_char c_status; /* State of connection on this file desc. */
	70	#define CS_UNUSED 0 /* File descriptor unused */
	71	#define CS_CON 1 /* Waiting to connect/read greeting */
	72	#define CS_SIZE 2 /* Waiting to read initial packet size */
	73	#define CS_KEYS 3 /* Waiting to read public key packet */
	74	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	75	int c_plen; /* Packet length field for ssh packet */
	76	int c_len; /* Total bytes which must be read. */
	77	int c_off; /* Length of data read so far. */
	78	int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	79	char c_namebase; / Address to free for c_name and c_namelist */
	80	char c_name; / Hostname of connection for errors */
	81	char c_namelist; / Pointer to other possible addresses */
	82	char c_output_name; / Hostname of connection for output */
	83	char c_data; / Data read from this fd */
	84	Kex c_kex; / The key-exchange struct for ssh2 */
	85	struct timeval c_tv; /* Time at which connection gets aborted */
	86	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	87	} con;
	88
	89	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	90	con *fdcon;
	91
	92	/*
	93	* This is just a wrapper around fgets() to make it usable.
	94	*/
	95
	96	/* Stress-test. Increase this later. */
	97	#define LINEBUF_SIZE 16
	98
99	typedef struct {
100	char *buf;
101	u_int size;
102	int lineno;
103	const char *filename;
104	FILE *stream;
105	void (errfun) (const char ,...);
106	} Linebuf;
107
108	static Linebuf *
109	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
110	{
111	Linebuf *lb;
112
113	if (!(lb = malloc(sizeof(*lb)))) {
114	if (errfun)
41b2f314	115	(*errfun) ("linebuf (%s): malloc failed\n",
41b2f314	116	filename ? filename : "(stdin)");
3c0ef626	117	return (NULL);
	118	}
	119	if (filename) {
	120	lb->filename = filename;
	121	if (!(lb->stream = fopen(filename, "r"))) {
	122	xfree(lb);
	123	if (errfun)
	124	(*errfun) ("%s: %s\n", filename, strerror(errno));
	125	return (NULL);
	126	}
	127	} else {
	128	lb->filename = "(stdin)";
	129	lb->stream = stdin;
	130	}
	131
	132	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	133	if (errfun)
	134	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	135	xfree(lb);
	136	return (NULL);
	137	}
	138	lb->errfun = errfun;
	139	lb->lineno = 0;
	140	return (lb);
	141	}
	142
	143	static void
	144	Linebuf_free(Linebuf * lb)
	145	{
	146	fclose(lb->stream);
	147	xfree(lb->buf);
	148	xfree(lb);
	149	}
	150
	151	#if 0
	152	static void
	153	Linebuf_restart(Linebuf * lb)
	154	{
	155	clearerr(lb->stream);
	156	rewind(lb->stream);
	157	lb->lineno = 0;
	158	}
	159
	160	static int
	161	Linebuf_lineno(Linebuf * lb)
	162	{
	163	return (lb->lineno);
	164	}
	165	#endif
	166
	167	static char *
	168	Linebuf_getline(Linebuf * lb)
	169	{
	170	int n = 0;
41b2f314	171	void *p;
3c0ef626	172
	173	lb->lineno++;
	174	for (;;) {
	175	/* Read a line */
	176	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	177	if (ferror(lb->stream) && lb->errfun)
41b2f314	178	(*lb->errfun)("%s: %s\n", lb->filename,
3c0ef626	179	strerror(errno));
	180	return (NULL);
	181	}
	182	n = strlen(lb->buf);
	183
	184	/* Return it or an error if it fits */
	185	if (n > 0 && lb->buf[n - 1] == '\n') {
	186	lb->buf[n - 1] = '\0';
	187	return (lb->buf);
	188	}
	189	if (n != lb->size - 1) {
	190	if (lb->errfun)
41b2f314	191	(*lb->errfun)("%s: skipping incomplete last line\n",
3c0ef626	192	lb->filename);
	193	return (NULL);
	194	}
	195	/* Double the buffer if we need more space */
41b2f314	196	lb->size *= 2;
	197	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	198	lb->size /= 2;
3c0ef626	199	if (lb->errfun)
41b2f314	200	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	201	lb->filename);
	202	return (NULL);
	203	}
41b2f314	204	lb->buf = p;
3c0ef626	205	}
	206	}
	207
	208	static int
	209	fdlim_get(int hard)
	210	{
	211	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	212	struct rlimit rlfd;
	213
	214	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	215	return (-1);
	216	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
9cb1827b	217	return 10000;
3c0ef626	218	else
3c0ef626	219	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
9cb1827b	220	#elif defined (HAVE_SYSCONF)
9cb1827b	221	return sysconf (_SC_OPEN_MAX);
3c0ef626	222	#else
9cb1827b	223	return 10000;
3c0ef626	224	#endif
	225	}
	226
	227	static int
	228	fdlim_set(int lim)
	229	{
	230	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	231	struct rlimit rlfd;
	232	#endif
41b2f314	233
3c0ef626	234	if (lim <= 0)
	235	return (-1);
	236	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	237	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	238	return (-1);
	239	rlfd.rlim_cur = lim;
	240	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	241	return (-1);
	242	#elif defined (HAVE_SETDTABLESIZE)
	243	setdtablesize(lim);
	244	#endif
	245	return (0);
	246	}
	247
	248	/*
	249	* This is an strsep function that returns a null field for adjacent
	250	* separators. This is the same as the 4.4BSD strsep, but different from the
	251	* one in the GNU libc.
	252	*/
	253	static char *
	254	xstrsep(char *str, const char delim)
	255	{
	256	char s, e;
	257
	258	if (!**str)
	259	return (NULL);
	260
	261	s = *str;
	262	e = s + strcspn(s, delim);
	263
	264	if (*e != '\0')
	265	*e++ = '\0';
	266	*str = e;
	267
	268	return (s);
	269	}
	270
	271	/*
	272	* Get the next non-null token (like GNU strsep). Strsep() will return a
	273	* null token for two adjacent separators, so we may have to loop.
	274	*/
	275	static char *
	276	strnnsep(char *stringp, char delim)
	277	{
	278	char *tok;
	279
	280	do {
	281	tok = xstrsep(stringp, delim);
	282	} while (tok && *tok == '\0');
	283	return (tok);
	284	}
	285
	286	static Key *
	287	keygrab_ssh1(con *c)
	288	{
	289	static Key *rsa;
	290	static Buffer msg;
	291
	292	if (rsa == NULL) {
	293	buffer_init(&msg);
	294	rsa = key_new(KEY_RSA1);
	295	}
	296	buffer_append(&msg, c->c_data, c->c_plen);
	297	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
298	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
299	error("%s: invalid packet type", c->c_name);
300	buffer_clear(&msg);
301	return NULL;
302	}
303	buffer_consume(&msg, 8); /* cookie */
304
305	/* server key */
306	(void) buffer_get_int(&msg);
307	buffer_get_bignum(&msg, rsa->rsa->e);
308	buffer_get_bignum(&msg, rsa->rsa->n);
309
310	/* host key */
311	(void) buffer_get_int(&msg);
312	buffer_get_bignum(&msg, rsa->rsa->e);
313	buffer_get_bignum(&msg, rsa->rsa->n);
314
315	buffer_clear(&msg);
316
317	return (rsa);
318	}
319
320	static int
321	hostjump(Key *hostkey)
322	{
323	kexjmp_key = hostkey;
324	longjmp(kexjmp, 1);
325	}
326
327	static int
328	ssh2_capable(int remote_major, int remote_minor)
329	{
330	switch (remote_major) {
331	case 1:
332	if (remote_minor == 99)
333	return 1;
334	break;
335	case 2:
336	return 1;
337	default:
338	break;
339	}
340	return 0;
341	}
342
343	static Key *
344	keygrab_ssh2(con *c)
345	{
346	int j;
347
348	packet_set_connection(c->c_fd, c->c_fd);
349	enable_compat20();
350	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
351	"ssh-dss": "ssh-rsa";
352	c->c_kex = kex_setup(myproposal);
6a9b3198	353	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
6a9b3198	354	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
3c0ef626	355	c->c_kex->verify_host_key = hostjump;
	356
	357	if (!(j = setjmp(kexjmp))) {
	358	nonfatal_fatal = 1;
	359	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
	360	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
	361	exit(1);
	362	}
	363	nonfatal_fatal = 0;
	364	xfree(c->c_kex);
	365	c->c_kex = NULL;
	366	packet_close();
	367
	368	return j < 0? NULL : kexjmp_key;
	369	}
	370
	371	static void
	372	keyprint(con c, Key key)
	373	{
	374	if (!key)
	375	return;
	376
	377	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
	378	key_write(key, stdout);
	379	fputs("\n", stdout);
	380	}
	381
	382	static int
	383	tcpconnect(char *host)
	384	{
	385	struct addrinfo hints, ai, aitop;
	386	char strport[NI_MAXSERV];
	387	int gaierr, s = -1;
	388
	389	snprintf(strport, sizeof strport, "%d", ssh_port);
	390	memset(&hints, 0, sizeof(hints));
	391	hints.ai_family = IPv4or6;
	392	hints.ai_socktype = SOCK_STREAM;
	393	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	394	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	395	for (ai = aitop; ai; ai = ai->ai_next) {
0fff78ff	396	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
3c0ef626	397	if (s < 0) {
	398	error("socket: %s", strerror(errno));
	399	continue;
	400	}
	401	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
	402	fatal("F_SETFL: %s", strerror(errno));
	403	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	404	errno != EINPROGRESS)
	405	error("connect (`%s'): %s", host, strerror(errno));
	406	else
	407	break;
	408	close(s);
	409	s = -1;
	410	}
	411	freeaddrinfo(aitop);
	412	return s;
	413	}
	414
	415	static int
	416	conalloc(char iname, char oname, int keytype)
	417	{
3c0ef626	418	char namebase, name, *namelist;
41b2f314	419	int s;
3c0ef626	420
	421	namebase = namelist = xstrdup(iname);
	422
	423	do {
	424	name = xstrsep(&namelist, ",");
	425	if (!name) {
	426	xfree(namebase);
	427	return (-1);
	428	}
	429	} while ((s = tcpconnect(name)) < 0);
	430
	431	if (s >= maxfd)
	432	fatal("conalloc: fdno %d too high", s);
	433	if (fdcon[s].c_status)
	434	fatal("conalloc: attempt to reuse fdno %d", s);
	435
	436	fdcon[s].c_fd = s;
	437	fdcon[s].c_status = CS_CON;
	438	fdcon[s].c_namebase = namebase;
	439	fdcon[s].c_name = name;
	440	fdcon[s].c_namelist = namelist;
	441	fdcon[s].c_output_name = xstrdup(oname);
	442	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	443	fdcon[s].c_len = 4;
	444	fdcon[s].c_off = 0;
	445	fdcon[s].c_keytype = keytype;
	446	gettimeofday(&fdcon[s].c_tv, NULL);
	447	fdcon[s].c_tv.tv_sec += timeout;
	448	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	449	FD_SET(s, read_wait);
	450	ncon++;
	451	return (s);
	452	}
	453
	454	static void
	455	confree(int s)
	456	{
	457	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	458	fatal("confree: attempt to free bad fdno %d", s);
	459	close(s);
	460	xfree(fdcon[s].c_namebase);
	461	xfree(fdcon[s].c_output_name);
	462	if (fdcon[s].c_status == CS_KEYS)
	463	xfree(fdcon[s].c_data);
	464	fdcon[s].c_status = CS_UNUSED;
	465	fdcon[s].c_keytype = 0;
	466	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	467	FD_CLR(s, read_wait);
	468	ncon--;
	469	}
	470
	471	static void
	472	contouch(int s)
	473	{
	474	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	475	gettimeofday(&fdcon[s].c_tv, NULL);
	476	fdcon[s].c_tv.tv_sec += timeout;
	477	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	478	}
	479
	480	static int
	481	conrecycle(int s)
	482	{
3c0ef626	483	con *c = &fdcon[s];
41b2f314	484	int ret;
3c0ef626	485
	486	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	487	confree(s);
	488	return (ret);
	489	}
	490
	491	static void
	492	congreet(int s)
	493	{
41b2f314	494	int remote_major, remote_minor, n = 0;
3c0ef626	495	char buf[256], *cp;
e9a17296	496	char remote_version[sizeof buf];
3c0ef626	497	size_t bufsiz;
3c0ef626	498	con *c = &fdcon[s];
	499
	500	bufsiz = sizeof(buf);
	501	cp = buf;
	502	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
	503	if (*cp == '\r')
	504	*cp = '\n';
	505	cp++;
	506	}
	507	if (n < 0) {
	508	if (errno != ECONNREFUSED)
	509	error("read (%s): %s", c->c_name, strerror(errno));
	510	conrecycle(s);
	511	return;
	512	}
e9a17296	513	if (n == 0) {
	514	error("%s: Connection closed by remote host", c->c_name);
	515	conrecycle(s);
	516	return;
	517	}
3c0ef626	518	if (cp != '\n' && cp != '\r') {
	519	error("%s: bad greeting", c->c_name);
	520	confree(s);
	521	return;
	522	}
	523	*cp = '\0';
e9a17296	524	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	525	&remote_major, &remote_minor, remote_version) == 3)
	526	compat_datafellows(remote_version);
	527	else
	528	datafellows = 0;
3c0ef626	529	if (c->c_keytype != KT_RSA1) {
3c0ef626	530	if (!ssh2_capable(remote_major, remote_minor)) {
	531	debug("%s doesn't support ssh2", c->c_name);
	532	confree(s);
	533	return;
	534	}
e9a17296	535	} else if (remote_major != 1) {
	536	debug("%s doesn't support ssh1", c->c_name);
	537	confree(s);
	538	return;
3c0ef626	539	}
	540	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	541	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	542	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	543	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
0fff78ff	544	if (atomicio(vwrite, s, buf, n) != n) {
3c0ef626	545	error("write (%s): %s", c->c_name, strerror(errno));
	546	confree(s);
	547	return;
	548	}
	549	if (c->c_keytype != KT_RSA1) {
	550	keyprint(c, keygrab_ssh2(c));
	551	confree(s);
	552	return;
	553	}
	554	c->c_status = CS_SIZE;
	555	contouch(s);
	556	}
	557
	558	static void
	559	conread(int s)
	560	{
3c0ef626	561	con *c = &fdcon[s];
41b2f314	562	int n;
3c0ef626	563
	564	if (c->c_status == CS_CON) {
	565	congreet(s);
	566	return;
	567	}
	568	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	569	if (n < 0) {
	570	error("read (%s): %s", c->c_name, strerror(errno));
	571	confree(s);
	572	return;
	573	}
	574	c->c_off += n;
	575
	576	if (c->c_off == c->c_len)
	577	switch (c->c_status) {
	578	case CS_SIZE:
	579	c->c_plen = htonl(c->c_plen);
	580	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	581	c->c_off = 0;
	582	c->c_data = xmalloc(c->c_len);
	583	c->c_status = CS_KEYS;
	584	break;
	585	case CS_KEYS:
	586	keyprint(c, keygrab_ssh1(c));
	587	confree(s);
	588	return;
	589	break;
	590	default:
	591	fatal("conread: invalid status %d", c->c_status);
	592	break;
	593	}
	594
	595	contouch(s);
	596	}
	597
	598	static void
	599	conloop(void)
	600	{
3c0ef626	601	struct timeval seltime, now;
41b2f314	602	fd_set r, e;
3c0ef626	603	con *c;
41b2f314	604	int i;
3c0ef626	605
3c0ef626	606	gettimeofday(&now, NULL);
f5799ae1	607	c = TAILQ_FIRST(&tq);
3c0ef626	608
	609	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	610	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	611	seltime = c->c_tv;
	612	seltime.tv_sec -= now.tv_sec;
	613	seltime.tv_usec -= now.tv_usec;
	614	if (seltime.tv_usec < 0) {
	615	seltime.tv_usec += 1000000;
	616	seltime.tv_sec--;
	617	}
	618	} else
	619	seltime.tv_sec = seltime.tv_usec = 0;
	620
	621	r = xmalloc(read_wait_size);
	622	memcpy(r, read_wait, read_wait_size);
	623	e = xmalloc(read_wait_size);
	624	memcpy(e, read_wait, read_wait_size);
	625
	626	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	627	(errno == EAGAIN \|\| errno == EINTR))
	628	;
	629
	630	for (i = 0; i < maxfd; i++) {
	631	if (FD_ISSET(i, e)) {
	632	error("%s: exception!", fdcon[i].c_name);
	633	confree(i);
	634	} else if (FD_ISSET(i, r))
	635	conread(i);
	636	}
	637	xfree(r);
	638	xfree(e);
	639
f5799ae1	640	c = TAILQ_FIRST(&tq);
3c0ef626	641	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	642	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	643	int s = c->c_fd;
	644
f5799ae1	645	c = TAILQ_NEXT(c, c_link);
3c0ef626	646	conrecycle(s);
	647	}
	648	}
	649
	650	static void
	651	do_host(char *host)
	652	{
	653	char *name = strnnsep(&host, " \t\n");
	654	int j;
	655
e9a17296	656	if (name == NULL)
e9a17296	657	return;
3c0ef626	658	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	659	if (get_keytypes & j) {
	660	while (ncon >= MAXCON)
	661	conloop();
	662	conalloc(name, *host ? host : name, j);
	663	}
	664	}
	665	}
	666
e9a17296	667	void
e9a17296	668	fatal(const char *fmt,...)
3c0ef626	669	{
e9a17296	670	va_list args;
41b2f314	671
e9a17296	672	va_start(args, fmt);
	673	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	674	va_end(args);
3c0ef626	675	if (nonfatal_fatal)
3c0ef626	676	longjmp(kexjmp, -1);
e9a17296	677	else
9cb1827b	678	fatal_cleanup();
3c0ef626	679	}
	680
	681	static void
	682	usage(void)
	683	{
0fff78ff	684	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-t type] [-f file]\n"
41b2f314	685	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	686	__progname);
3c0ef626	687	exit(1);
	688	}
	689
	690	int
	691	main(int argc, char **argv)
	692	{
	693	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	694	int opt, fopt_count = 0;
	695	char *tname;
	696
	697	extern int optind;
	698	extern char *optarg;
	699
0fff78ff	700	__progname = ssh_get_progname(argv[0]);
3c0ef626	701	init_rng();
	702	seed_rng();
	703	TAILQ_INIT(&tq);
	704
	705	if (argc <= 1)
	706	usage();
	707
	708	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
	709	switch (opt) {
	710	case 'p':
	711	ssh_port = a2port(optarg);
	712	if (ssh_port == 0) {
	713	fprintf(stderr, "Bad port '%s'\n", optarg);
	714	exit(1);
	715	}
	716	break;
	717	case 'T':
41b2f314	718	timeout = convtime(optarg);
	719	if (timeout == -1 \|\| timeout == 0) {
	720	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	721	usage();
41b2f314	722	}
3c0ef626	723	break;
	724	case 'v':
	725	if (!debug_flag) {
	726	debug_flag = 1;
	727	log_level = SYSLOG_LEVEL_DEBUG1;
	728	}
	729	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	730	log_level++;
	731	else
	732	fatal("Too high debugging level.");
	733	break;
	734	case 'f':
	735	if (strcmp(optarg, "-") == 0)
	736	optarg = NULL;
	737	argv[fopt_count++] = optarg;
	738	break;
	739	case 't':
	740	get_keytypes = 0;
	741	tname = strtok(optarg, ",");
	742	while (tname) {
	743	int type = key_type_from_name(tname);
	744	switch (type) {
	745	case KEY_RSA1:
	746	get_keytypes \|= KT_RSA1;
	747	break;
	748	case KEY_DSA:
	749	get_keytypes \|= KT_DSA;
	750	break;
	751	case KEY_RSA:
	752	get_keytypes \|= KT_RSA;
	753	break;
	754	case KEY_UNSPEC:
e9a17296	755	fatal("unknown key type %s", tname);
3c0ef626	756	}
	757	tname = strtok(NULL, ",");
	758	}
	759	break;
	760	case '4':
	761	IPv4or6 = AF_INET;
	762	break;
	763	case '6':
	764	IPv4or6 = AF_INET6;
	765	break;
	766	case '?':
	767	default:
	768	usage();
	769	}
	770	}
	771	if (optind == argc && !fopt_count)
	772	usage();
	773
	774	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	775
	776	maxfd = fdlim_get(1);
	777	if (maxfd < 0)
	778	fatal("%s: fdlim_get: bad value", __progname);
	779	if (maxfd > MAXMAXFD)
	780	maxfd = MAXMAXFD;
	781	if (MAXCON <= 0)
	782	fatal("%s: not enough file descriptors", __progname);
	783	if (maxfd > fdlim_get(0))
	784	fdlim_set(maxfd);
	785	fdcon = xmalloc(maxfd * sizeof(con));
	786	memset(fdcon, 0, maxfd * sizeof(con));
	787
	788	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	789	read_wait = xmalloc(read_wait_size);
	790	memset(read_wait, 0, read_wait_size);
	791
	792	if (fopt_count) {
	793	Linebuf *lb;
	794	char *line;
	795	int j;
	796
	797	for (j = 0; j < fopt_count; j++) {
	798	lb = Linebuf_alloc(argv[j], error);
	799	if (!lb)
	800	continue;
	801	while ((line = Linebuf_getline(lb)) != NULL)
	802	do_host(line);
	803	Linebuf_free(lb);
	804	}
	805	}
	806
	807	while (optind < argc)
	808	do_host(argv[optind++]);
	809
	810	while (ncon > 0)
	811	conloop();
	812
	813	return (0);
	814	}