[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 1.57 2005/10/30 04:01:03 djm 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"
#include "pathnames.h"
#include "hostfile.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 */

int hash_hosts = 0;		/* Hash hostname on output */

#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)
{
	size_t 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)
{
	char *host = c->c_output_name ? c->c_output_name : c->c_name;

	if (!key)
		return;
	if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
		fatal("host_hash failed");

	fprintf(stdout, "%s ", host);
	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 n = 0, remote_major = 0, remote_minor = 0;
	char buf[256], *cp;
	char remote_version[sizeof buf];
	size_t bufsiz;
	con *c = &fdcon[s];

	for (;;) {
		memset(buf, '\0', sizeof(buf));
		bufsiz = sizeof(buf);
		cp = buf;
		while (bufsiz-- &&
		    (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
			if (*cp == '\r')
				*cp = '\n';
			cp++;
		}
		if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
			break;
	}
	if (n == 0) {
		switch (errno) {
		case EPIPE:
			error("%s: Connection closed by remote host", c->c_name);
			break;
		case ECONNREFUSED:
			break;
		default:
			error("read (%s): %s", c->c_name, strerror(errno));
			break;
		}
		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 (n < 0 || (size_t)n >= sizeof(buf)) {
		error("snprintf: buffer too small");
		confree(s);
		return;
	}
	if (atomicio(vwrite, s, buf, n) != (size_t)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];
	size_t 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 [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\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_pathnames();
	init_rng();
	seed_rng();
	TAILQ_INIT(&tq);

	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
	sanitise_stdfd();

	if (argc <= 1)
		usage();

	while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
		switch (opt) {
		case 'H':
			hash_hosts = 1;
			break;
		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"
e00da40d	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.57 2005/10/30 04:01:03 djm Exp $");
3c0ef626	11
e54b3d7c	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"
2b8f6339	31	#include "pathnames.h"
34fee935	32	#include "hostfile.h"
3c0ef626	33
	34	/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
	35	Default value is AF_UNSPEC means both IPv4 and IPv6. */
3c0ef626	36	int IPv4or6 = AF_UNSPEC;
3c0ef626	37
	38	int ssh_port = SSH_DEFAULT_PORT;
	39
	40	#define KT_RSA1 1
	41	#define KT_DSA 2
	42	#define KT_RSA 4
	43
	44	int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
	45
34fee935	46	int hash_hosts = 0; /* Hash hostname on output */
34fee935	47
3c0ef626	48	#define MAXMAXFD 256
	49
	50	/* The number of seconds after which to give up on a TCP connection */
	51	int timeout = 5;
	52
	53	int maxfd;
	54	#define MAXCON (maxfd - 10)
	55
3c0ef626	56	extern char *__progname;
3c0ef626	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)
e54b3d7c	115	(*errfun) ("linebuf (%s): malloc failed\n",
e54b3d7c	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	{
34fee935	170	size_t n = 0;
e54b3d7c	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)
e54b3d7c	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)
e54b3d7c	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 */
e54b3d7c	196	lb->size *= 2;
	197	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	198	lb->size /= 2;
3c0ef626	199	if (lb->errfun)
e54b3d7c	200	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	201	lb->filename);
	202	return (NULL);
	203	}
e54b3d7c	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)
416fd2a8	217	return SSH_SYSFDMAX;
3c0ef626	218	else
3c0ef626	219	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
3c0ef626	220	#else
416fd2a8	221	return SSH_SYSFDMAX;
3c0ef626	222	#endif
	223	}
	224
	225	static int
	226	fdlim_set(int lim)
	227	{
	228	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	229	struct rlimit rlfd;
	230	#endif
e54b3d7c	231
3c0ef626	232	if (lim <= 0)
	233	return (-1);
	234	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	235	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	236	return (-1);
	237	rlfd.rlim_cur = lim;
	238	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	239	return (-1);
	240	#elif defined (HAVE_SETDTABLESIZE)
	241	setdtablesize(lim);
	242	#endif
	243	return (0);
	244	}
	245
	246	/*
	247	* This is an strsep function that returns a null field for adjacent
	248	* separators. This is the same as the 4.4BSD strsep, but different from the
	249	* one in the GNU libc.
	250	*/
	251	static char *
	252	xstrsep(char *str, const char delim)
	253	{
	254	char s, e;
	255
	256	if (!**str)
	257	return (NULL);
	258
	259	s = *str;
	260	e = s + strcspn(s, delim);
	261
	262	if (*e != '\0')
	263	*e++ = '\0';
	264	*str = e;
	265
	266	return (s);
	267	}
	268
	269	/*
	270	* Get the next non-null token (like GNU strsep). Strsep() will return a
	271	* null token for two adjacent separators, so we may have to loop.
	272	*/
	273	static char *
	274	strnnsep(char *stringp, char delim)
	275	{
	276	char *tok;
	277
	278	do {
	279	tok = xstrsep(stringp, delim);
	280	} while (tok && *tok == '\0');
	281	return (tok);
	282	}
	283
	284	static Key *
	285	keygrab_ssh1(con *c)
	286	{
	287	static Key *rsa;
	288	static Buffer msg;
	289
	290	if (rsa == NULL) {
	291	buffer_init(&msg);
	292	rsa = key_new(KEY_RSA1);
	293	}
	294	buffer_append(&msg, c->c_data, c->c_plen);
	295	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
296	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
297	error("%s: invalid packet type", c->c_name);
298	buffer_clear(&msg);
299	return NULL;
300	}
301	buffer_consume(&msg, 8); /* cookie */
302
303	/* server key */
304	(void) buffer_get_int(&msg);
305	buffer_get_bignum(&msg, rsa->rsa->e);
306	buffer_get_bignum(&msg, rsa->rsa->n);
307
308	/* host key */
309	(void) buffer_get_int(&msg);
310	buffer_get_bignum(&msg, rsa->rsa->e);
311	buffer_get_bignum(&msg, rsa->rsa->n);
312
313	buffer_clear(&msg);
314
315	return (rsa);
316	}
317
318	static int
319	hostjump(Key *hostkey)
320	{
321	kexjmp_key = hostkey;
322	longjmp(kexjmp, 1);
323	}
324
325	static int
326	ssh2_capable(int remote_major, int remote_minor)
327	{
328	switch (remote_major) {
329	case 1:
330	if (remote_minor == 99)
331	return 1;
332	break;
333	case 2:
334	return 1;
335	default:
336	break;
337	}
338	return 0;
339	}
340
341	static Key *
342	keygrab_ssh2(con *c)
343	{
344	int j;
345
346	packet_set_connection(c->c_fd, c->c_fd);
347	enable_compat20();
348	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
349	"ssh-dss": "ssh-rsa";
350	c->c_kex = kex_setup(myproposal);
1c14df9e	351	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1b56ff3d	352	c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1c14df9e	353	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
3c0ef626	354	c->c_kex->verify_host_key = hostjump;
	355
	356	if (!(j = setjmp(kexjmp))) {
	357	nonfatal_fatal = 1;
	358	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
	359	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
	360	exit(1);
	361	}
	362	nonfatal_fatal = 0;
	363	xfree(c->c_kex);
	364	c->c_kex = NULL;
	365	packet_close();
	366
	367	return j < 0? NULL : kexjmp_key;
	368	}
	369
	370	static void
	371	keyprint(con c, Key key)
	372	{
34fee935	373	char *host = c->c_output_name ? c->c_output_name : c->c_name;
34fee935	374
3c0ef626	375	if (!key)
3c0ef626	376	return;
34fee935	377	if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
34fee935	378	fatal("host_hash failed");
3c0ef626	379
34fee935	380	fprintf(stdout, "%s ", host);
3c0ef626	381	key_write(key, stdout);
	382	fputs("\n", stdout);
	383	}
	384
	385	static int
	386	tcpconnect(char *host)
	387	{
	388	struct addrinfo hints, ai, aitop;
	389	char strport[NI_MAXSERV];
	390	int gaierr, s = -1;
	391
	392	snprintf(strport, sizeof strport, "%d", ssh_port);
	393	memset(&hints, 0, sizeof(hints));
	394	hints.ai_family = IPv4or6;
	395	hints.ai_socktype = SOCK_STREAM;
	396	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	397	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	398	for (ai = aitop; ai; ai = ai->ai_next) {
70791e56	399	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
3c0ef626	400	if (s < 0) {
	401	error("socket: %s", strerror(errno));
	402	continue;
	403	}
1b56ff3d	404	if (set_nonblock(s) == -1)
1b56ff3d	405	fatal("%s: set_nonblock(%d)", __func__, s);
3c0ef626	406	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	407	errno != EINPROGRESS)
	408	error("connect (`%s'): %s", host, strerror(errno));
	409	else
	410	break;
	411	close(s);
	412	s = -1;
	413	}
	414	freeaddrinfo(aitop);
	415	return s;
	416	}
	417
	418	static int
	419	conalloc(char iname, char oname, int keytype)
	420	{
3c0ef626	421	char namebase, name, *namelist;
e54b3d7c	422	int s;
3c0ef626	423
	424	namebase = namelist = xstrdup(iname);
	425
	426	do {
	427	name = xstrsep(&namelist, ",");
	428	if (!name) {
	429	xfree(namebase);
	430	return (-1);
	431	}
	432	} while ((s = tcpconnect(name)) < 0);
	433
	434	if (s >= maxfd)
	435	fatal("conalloc: fdno %d too high", s);
	436	if (fdcon[s].c_status)
	437	fatal("conalloc: attempt to reuse fdno %d", s);
	438
	439	fdcon[s].c_fd = s;
	440	fdcon[s].c_status = CS_CON;
	441	fdcon[s].c_namebase = namebase;
	442	fdcon[s].c_name = name;
	443	fdcon[s].c_namelist = namelist;
	444	fdcon[s].c_output_name = xstrdup(oname);
	445	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	446	fdcon[s].c_len = 4;
	447	fdcon[s].c_off = 0;
	448	fdcon[s].c_keytype = keytype;
	449	gettimeofday(&fdcon[s].c_tv, NULL);
	450	fdcon[s].c_tv.tv_sec += timeout;
	451	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	452	FD_SET(s, read_wait);
	453	ncon++;
	454	return (s);
	455	}
	456
	457	static void
	458	confree(int s)
	459	{
	460	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	461	fatal("confree: attempt to free bad fdno %d", s);
	462	close(s);
	463	xfree(fdcon[s].c_namebase);
	464	xfree(fdcon[s].c_output_name);
	465	if (fdcon[s].c_status == CS_KEYS)
	466	xfree(fdcon[s].c_data);
	467	fdcon[s].c_status = CS_UNUSED;
	468	fdcon[s].c_keytype = 0;
	469	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	470	FD_CLR(s, read_wait);
	471	ncon--;
	472	}
	473
	474	static void
	475	contouch(int s)
	476	{
	477	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	478	gettimeofday(&fdcon[s].c_tv, NULL);
	479	fdcon[s].c_tv.tv_sec += timeout;
	480	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	481	}
	482
	483	static int
	484	conrecycle(int s)
	485	{
3c0ef626	486	con *c = &fdcon[s];
e54b3d7c	487	int ret;
3c0ef626	488
	489	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	490	confree(s);
	491	return (ret);
	492	}
	493
	494	static void
	495	congreet(int s)
	496	{
34fee935	497	int n = 0, remote_major = 0, remote_minor = 0;
3c0ef626	498	char buf[256], *cp;
e9a17296	499	char remote_version[sizeof buf];
3c0ef626	500	size_t bufsiz;
3c0ef626	501	con *c = &fdcon[s];
3c0ef626	502
e00da40d	503	for (;;) {
	504	memset(buf, '\0', sizeof(buf));
	505	bufsiz = sizeof(buf);
	506	cp = buf;
	507	while (bufsiz-- &&
	508	(n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
	509	if (*cp == '\r')
	510	*cp = '\n';
	511	cp++;
	512	}
	513	if (n != 1 \|\| strncmp(buf, "SSH-", 4) == 0)
	514	break;
3c0ef626	515	}
e9a17296	516	if (n == 0) {
34fee935	517	switch (errno) {
	518	case EPIPE:
	519	error("%s: Connection closed by remote host", c->c_name);
	520	break;
	521	case ECONNREFUSED:
	522	break;
	523	default:
	524	error("read (%s): %s", c->c_name, strerror(errno));
	525	break;
	526	}
e9a17296	527	conrecycle(s);
	528	return;
	529	}
3c0ef626	530	if (cp != '\n' && cp != '\r') {
	531	error("%s: bad greeting", c->c_name);
	532	confree(s);
	533	return;
	534	}
	535	*cp = '\0';
e9a17296	536	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	537	&remote_major, &remote_minor, remote_version) == 3)
	538	compat_datafellows(remote_version);
	539	else
	540	datafellows = 0;
3c0ef626	541	if (c->c_keytype != KT_RSA1) {
3c0ef626	542	if (!ssh2_capable(remote_major, remote_minor)) {
	543	debug("%s doesn't support ssh2", c->c_name);
	544	confree(s);
	545	return;
	546	}
e9a17296	547	} else if (remote_major != 1) {
	548	debug("%s doesn't support ssh1", c->c_name);
	549	confree(s);
	550	return;
3c0ef626	551	}
	552	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	553	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	554	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	555	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
34fee935	556	if (n < 0 \|\| (size_t)n >= sizeof(buf)) {
	557	error("snprintf: buffer too small");
	558	confree(s);
	559	return;
	560	}
	561	if (atomicio(vwrite, s, buf, n) != (size_t)n) {
3c0ef626	562	error("write (%s): %s", c->c_name, strerror(errno));
	563	confree(s);
	564	return;
	565	}
	566	if (c->c_keytype != KT_RSA1) {
	567	keyprint(c, keygrab_ssh2(c));
	568	confree(s);
	569	return;
	570	}
	571	c->c_status = CS_SIZE;
	572	contouch(s);
	573	}
	574
	575	static void
	576	conread(int s)
	577	{
3c0ef626	578	con *c = &fdcon[s];
34fee935	579	size_t n;
3c0ef626	580
	581	if (c->c_status == CS_CON) {
	582	congreet(s);
	583	return;
	584	}
1b56ff3d	585	n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
34fee935	586	if (n == 0) {
3c0ef626	587	error("read (%s): %s", c->c_name, strerror(errno));
	588	confree(s);
	589	return;
	590	}
	591	c->c_off += n;
	592
	593	if (c->c_off == c->c_len)
	594	switch (c->c_status) {
	595	case CS_SIZE:
	596	c->c_plen = htonl(c->c_plen);
	597	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	598	c->c_off = 0;
	599	c->c_data = xmalloc(c->c_len);
	600	c->c_status = CS_KEYS;
	601	break;
	602	case CS_KEYS:
	603	keyprint(c, keygrab_ssh1(c));
	604	confree(s);
	605	return;
	606	break;
	607	default:
	608	fatal("conread: invalid status %d", c->c_status);
	609	break;
	610	}
	611
	612	contouch(s);
	613	}
	614
	615	static void
	616	conloop(void)
	617	{
3c0ef626	618	struct timeval seltime, now;
e54b3d7c	619	fd_set r, e;
3c0ef626	620	con *c;
e54b3d7c	621	int i;
3c0ef626	622
3c0ef626	623	gettimeofday(&now, NULL);
ff2d7a98	624	c = TAILQ_FIRST(&tq);
3c0ef626	625
	626	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	627	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	628	seltime = c->c_tv;
	629	seltime.tv_sec -= now.tv_sec;
	630	seltime.tv_usec -= now.tv_usec;
	631	if (seltime.tv_usec < 0) {
	632	seltime.tv_usec += 1000000;
	633	seltime.tv_sec--;
	634	}
	635	} else
	636	seltime.tv_sec = seltime.tv_usec = 0;
	637
	638	r = xmalloc(read_wait_size);
	639	memcpy(r, read_wait, read_wait_size);
	640	e = xmalloc(read_wait_size);
	641	memcpy(e, read_wait, read_wait_size);
	642
	643	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	644	(errno == EAGAIN \|\| errno == EINTR))
	645	;
	646
	647	for (i = 0; i < maxfd; i++) {
	648	if (FD_ISSET(i, e)) {
	649	error("%s: exception!", fdcon[i].c_name);
	650	confree(i);
	651	} else if (FD_ISSET(i, r))
	652	conread(i);
	653	}
	654	xfree(r);
	655	xfree(e);
	656
ff2d7a98	657	c = TAILQ_FIRST(&tq);
3c0ef626	658	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	659	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	660	int s = c->c_fd;
	661
ff2d7a98	662	c = TAILQ_NEXT(c, c_link);
3c0ef626	663	conrecycle(s);
	664	}
	665	}
	666
	667	static void
	668	do_host(char *host)
	669	{
	670	char *name = strnnsep(&host, " \t\n");
	671	int j;
	672
e9a17296	673	if (name == NULL)
e9a17296	674	return;
3c0ef626	675	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	676	if (get_keytypes & j) {
	677	while (ncon >= MAXCON)
	678	conloop();
	679	conalloc(name, *host ? host : name, j);
	680	}
	681	}
	682	}
	683
e9a17296	684	void
e9a17296	685	fatal(const char *fmt,...)
3c0ef626	686	{
e9a17296	687	va_list args;
e54b3d7c	688
e9a17296	689	va_start(args, fmt);
	690	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	691	va_end(args);
3c0ef626	692	if (nonfatal_fatal)
3c0ef626	693	longjmp(kexjmp, -1);
e9a17296	694	else
416fd2a8	695	exit(255);
3c0ef626	696	}
	697
	698	static void
	699	usage(void)
	700	{
34fee935	701	fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
e54b3d7c	702	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	703	__progname);
3c0ef626	704	exit(1);
	705	}
	706
	707	int
	708	main(int argc, char **argv)
	709	{
	710	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	711	int opt, fopt_count = 0;
	712	char *tname;
	713
	714	extern int optind;
	715	extern char *optarg;
	716
70791e56	717	__progname = ssh_get_progname(argv[0]);
2b8f6339	718	init_pathnames();
3c0ef626	719	init_rng();
	720	seed_rng();
	721	TAILQ_INIT(&tq);
	722
e00da40d	723	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
	724	sanitise_stdfd();
	725
3c0ef626	726	if (argc <= 1)
	727	usage();
	728
34fee935	729	while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
3c0ef626	730	switch (opt) {
34fee935	731	case 'H':
	732	hash_hosts = 1;
	733	break;
3c0ef626	734	case 'p':
	735	ssh_port = a2port(optarg);
	736	if (ssh_port == 0) {
	737	fprintf(stderr, "Bad port '%s'\n", optarg);
	738	exit(1);
	739	}
	740	break;
	741	case 'T':
e54b3d7c	742	timeout = convtime(optarg);
	743	if (timeout == -1 \|\| timeout == 0) {
	744	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	745	usage();
e54b3d7c	746	}
3c0ef626	747	break;
	748	case 'v':
	749	if (!debug_flag) {
	750	debug_flag = 1;
	751	log_level = SYSLOG_LEVEL_DEBUG1;
	752	}
	753	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	754	log_level++;
	755	else
	756	fatal("Too high debugging level.");
	757	break;
	758	case 'f':
	759	if (strcmp(optarg, "-") == 0)
	760	optarg = NULL;
	761	argv[fopt_count++] = optarg;
	762	break;
	763	case 't':
	764	get_keytypes = 0;
	765	tname = strtok(optarg, ",");
	766	while (tname) {
	767	int type = key_type_from_name(tname);
	768	switch (type) {
	769	case KEY_RSA1:
	770	get_keytypes \|= KT_RSA1;
	771	break;
	772	case KEY_DSA:
	773	get_keytypes \|= KT_DSA;
	774	break;
	775	case KEY_RSA:
	776	get_keytypes \|= KT_RSA;
	777	break;
	778	case KEY_UNSPEC:
e9a17296	779	fatal("unknown key type %s", tname);
3c0ef626	780	}
	781	tname = strtok(NULL, ",");
	782	}
	783	break;
	784	case '4':
	785	IPv4or6 = AF_INET;
	786	break;
	787	case '6':
	788	IPv4or6 = AF_INET6;
	789	break;
	790	case '?':
	791	default:
	792	usage();
	793	}
	794	}
	795	if (optind == argc && !fopt_count)
	796	usage();
	797
	798	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	799
	800	maxfd = fdlim_get(1);
	801	if (maxfd < 0)
	802	fatal("%s: fdlim_get: bad value", __progname);
	803	if (maxfd > MAXMAXFD)
	804	maxfd = MAXMAXFD;
	805	if (MAXCON <= 0)
	806	fatal("%s: not enough file descriptors", __progname);
	807	if (maxfd > fdlim_get(0))
	808	fdlim_set(maxfd);
	809	fdcon = xmalloc(maxfd * sizeof(con));
	810	memset(fdcon, 0, maxfd * sizeof(con));
	811
	812	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	813	read_wait = xmalloc(read_wait_size);
	814	memset(read_wait, 0, read_wait_size);
	815
	816	if (fopt_count) {
	817	Linebuf *lb;
	818	char *line;
	819	int j;
	820
	821	for (j = 0; j < fopt_count; j++) {
	822	lb = Linebuf_alloc(argv[j], error);
	823	if (!lb)
	824	continue;
	825	while ((line = Linebuf_getline(lb)) != NULL)
	826	do_host(line);
	827	Linebuf_free(lb);
	828	}
	829	}
	830
	831	while (optind < argc)
	832	do_host(argv[optind++]);
	833
	834	while (ncon > 0)
	835	conloop();
	836
	837	return (0);
	838	}