[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 "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_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"
2c06c99b	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.57 2005/10/30 04:01:03 djm 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"
996d5e62	31	#include "hostfile.h"
3c0ef626	32
	33	/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
	34	Default value is AF_UNSPEC means both IPv4 and IPv6. */
3c0ef626	35	int IPv4or6 = AF_UNSPEC;
3c0ef626	36
	37	int ssh_port = SSH_DEFAULT_PORT;
	38
	39	#define KT_RSA1 1
	40	#define KT_DSA 2
	41	#define KT_RSA 4
	42
	43	int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
	44
996d5e62	45	int hash_hosts = 0; /* Hash hostname on output */
996d5e62	46
3c0ef626	47	#define MAXMAXFD 256
	48
	49	/* The number of seconds after which to give up on a TCP connection */
	50	int timeout = 5;
	51
	52	int maxfd;
	53	#define MAXCON (maxfd - 10)
	54
3c0ef626	55	extern char *__progname;
3c0ef626	56	fd_set *read_wait;
	57	size_t read_wait_size;
	58	int ncon;
	59	int nonfatal_fatal = 0;
	60	jmp_buf kexjmp;
	61	Key *kexjmp_key;
	62
	63	/*
	64	* Keep a connection structure for each file descriptor. The state
	65	* associated with file descriptor n is held in fdcon[n].
	66	*/
	67	typedef struct Connection {
	68	u_char c_status; /* State of connection on this file desc. */
	69	#define CS_UNUSED 0 /* File descriptor unused */
	70	#define CS_CON 1 /* Waiting to connect/read greeting */
	71	#define CS_SIZE 2 /* Waiting to read initial packet size */
	72	#define CS_KEYS 3 /* Waiting to read public key packet */
	73	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	74	int c_plen; /* Packet length field for ssh packet */
	75	int c_len; /* Total bytes which must be read. */
	76	int c_off; /* Length of data read so far. */
	77	int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	78	char c_namebase; / Address to free for c_name and c_namelist */
	79	char c_name; / Hostname of connection for errors */
	80	char c_namelist; / Pointer to other possible addresses */
	81	char c_output_name; / Hostname of connection for output */
	82	char c_data; / Data read from this fd */
	83	Kex c_kex; / The key-exchange struct for ssh2 */
	84	struct timeval c_tv; /* Time at which connection gets aborted */
	85	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	86	} con;
	87
	88	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	89	con *fdcon;
	90
	91	/*
	92	* This is just a wrapper around fgets() to make it usable.
	93	*/
	94
	95	/* Stress-test. Increase this later. */
	96	#define LINEBUF_SIZE 16
	97
	98	typedef struct {
	99	char *buf;
	100	u_int size;
	101	int lineno;
	102	const char *filename;
	103	FILE *stream;
	104	void (errfun) (const char ,...);
	105	} Linebuf;
	106
	107	static Linebuf *
	108	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
	109	{
	110	Linebuf *lb;
	111
	112	if (!(lb = malloc(sizeof(*lb)))) {
	113	if (errfun)
41b2f314	114	(*errfun) ("linebuf (%s): malloc failed\n",
41b2f314	115	filename ? filename : "(stdin)");
3c0ef626	116	return (NULL);
	117	}
	118	if (filename) {
	119	lb->filename = filename;
	120	if (!(lb->stream = fopen(filename, "r"))) {
	121	xfree(lb);
	122	if (errfun)
	123	(*errfun) ("%s: %s\n", filename, strerror(errno));
	124	return (NULL);
	125	}
	126	} else {
	127	lb->filename = "(stdin)";
	128	lb->stream = stdin;
	129	}
	130
	131	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	132	if (errfun)
	133	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	134	xfree(lb);
	135	return (NULL);
	136	}
	137	lb->errfun = errfun;
	138	lb->lineno = 0;
	139	return (lb);
	140	}
	141
	142	static void
	143	Linebuf_free(Linebuf * lb)
	144	{
	145	fclose(lb->stream);
	146	xfree(lb->buf);
	147	xfree(lb);
	148	}
	149
	150	#if 0
	151	static void
	152	Linebuf_restart(Linebuf * lb)
	153	{
	154	clearerr(lb->stream);
	155	rewind(lb->stream);
	156	lb->lineno = 0;
	157	}
	158
	159	static int
	160	Linebuf_lineno(Linebuf * lb)
	161	{
	162	return (lb->lineno);
	163	}
	164	#endif
	165
	166	static char *
	167	Linebuf_getline(Linebuf * lb)
	168	{
665a873d	169	size_t n = 0;
41b2f314	170	void *p;
3c0ef626	171
	172	lb->lineno++;
	173	for (;;) {
	174	/* Read a line */
	175	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	176	if (ferror(lb->stream) && lb->errfun)
41b2f314	177	(*lb->errfun)("%s: %s\n", lb->filename,
3c0ef626	178	strerror(errno));
	179	return (NULL);
	180	}
	181	n = strlen(lb->buf);
	182
	183	/* Return it or an error if it fits */
	184	if (n > 0 && lb->buf[n - 1] == '\n') {
	185	lb->buf[n - 1] = '\0';
	186	return (lb->buf);
	187	}
	188	if (n != lb->size - 1) {
	189	if (lb->errfun)
41b2f314	190	(*lb->errfun)("%s: skipping incomplete last line\n",
3c0ef626	191	lb->filename);
	192	return (NULL);
	193	}
	194	/* Double the buffer if we need more space */
41b2f314	195	lb->size *= 2;
	196	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	197	lb->size /= 2;
3c0ef626	198	if (lb->errfun)
41b2f314	199	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	200	lb->filename);
	201	return (NULL);
	202	}
41b2f314	203	lb->buf = p;
3c0ef626	204	}
	205	}
	206
	207	static int
	208	fdlim_get(int hard)
	209	{
	210	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	211	struct rlimit rlfd;
	212
	213	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	214	return (-1);
	215	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
cdd66111	216	return SSH_SYSFDMAX;
3c0ef626	217	else
3c0ef626	218	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
3c0ef626	219	#else
cdd66111	220	return SSH_SYSFDMAX;
3c0ef626	221	#endif
	222	}
	223
	224	static int
	225	fdlim_set(int lim)
	226	{
	227	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	228	struct rlimit rlfd;
	229	#endif
41b2f314	230
3c0ef626	231	if (lim <= 0)
	232	return (-1);
	233	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	234	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	235	return (-1);
	236	rlfd.rlim_cur = lim;
	237	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	238	return (-1);
	239	#elif defined (HAVE_SETDTABLESIZE)
	240	setdtablesize(lim);
	241	#endif
	242	return (0);
	243	}
	244
	245	/*
	246	* This is an strsep function that returns a null field for adjacent
	247	* separators. This is the same as the 4.4BSD strsep, but different from the
	248	* one in the GNU libc.
	249	*/
	250	static char *
	251	xstrsep(char *str, const char delim)
	252	{
	253	char s, e;
	254
	255	if (!**str)
	256	return (NULL);
	257
	258	s = *str;
	259	e = s + strcspn(s, delim);
	260
	261	if (*e != '\0')
	262	*e++ = '\0';
	263	*str = e;
	264
	265	return (s);
	266	}
	267
	268	/*
	269	* Get the next non-null token (like GNU strsep). Strsep() will return a
	270	* null token for two adjacent separators, so we may have to loop.
	271	*/
	272	static char *
	273	strnnsep(char *stringp, char delim)
	274	{
	275	char *tok;
	276
	277	do {
	278	tok = xstrsep(stringp, delim);
	279	} while (tok && *tok == '\0');
	280	return (tok);
	281	}
	282
	283	static Key *
	284	keygrab_ssh1(con *c)
	285	{
	286	static Key *rsa;
	287	static Buffer msg;
	288
	289	if (rsa == NULL) {
	290	buffer_init(&msg);
	291	rsa = key_new(KEY_RSA1);
	292	}
	293	buffer_append(&msg, c->c_data, c->c_plen);
	294	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
295	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
296	error("%s: invalid packet type", c->c_name);
297	buffer_clear(&msg);
298	return NULL;
299	}
300	buffer_consume(&msg, 8); /* cookie */
301
302	/* server key */
303	(void) buffer_get_int(&msg);
304	buffer_get_bignum(&msg, rsa->rsa->e);
305	buffer_get_bignum(&msg, rsa->rsa->n);
306
307	/* host key */
308	(void) buffer_get_int(&msg);
309	buffer_get_bignum(&msg, rsa->rsa->e);
310	buffer_get_bignum(&msg, rsa->rsa->n);
311
312	buffer_clear(&msg);
313
314	return (rsa);
315	}
316
317	static int
318	hostjump(Key *hostkey)
319	{
320	kexjmp_key = hostkey;
321	longjmp(kexjmp, 1);
322	}
323
324	static int
325	ssh2_capable(int remote_major, int remote_minor)
326	{
327	switch (remote_major) {
328	case 1:
329	if (remote_minor == 99)
330	return 1;
331	break;
332	case 2:
333	return 1;
334	default:
335	break;
336	}
337	return 0;
338	}
339
340	static Key *
341	keygrab_ssh2(con *c)
342	{
343	int j;
344
345	packet_set_connection(c->c_fd, c->c_fd);
346	enable_compat20();
347	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
348	"ssh-dss": "ssh-rsa";
349	c->c_kex = kex_setup(myproposal);
6a9b3198	350	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
c9f39d2c	351	c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
6a9b3198	352	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
3c0ef626	353	c->c_kex->verify_host_key = hostjump;
	354
	355	if (!(j = setjmp(kexjmp))) {
	356	nonfatal_fatal = 1;
	357	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
	358	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
	359	exit(1);
	360	}
	361	nonfatal_fatal = 0;
	362	xfree(c->c_kex);
	363	c->c_kex = NULL;
	364	packet_close();
	365
	366	return j < 0? NULL : kexjmp_key;
	367	}
	368
	369	static void
	370	keyprint(con c, Key key)
	371	{
996d5e62	372	char *host = c->c_output_name ? c->c_output_name : c->c_name;
996d5e62	373
3c0ef626	374	if (!key)
3c0ef626	375	return;
996d5e62	376	if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
996d5e62	377	fatal("host_hash failed");
3c0ef626	378
996d5e62	379	fprintf(stdout, "%s ", host);
3c0ef626	380	key_write(key, stdout);
	381	fputs("\n", stdout);
	382	}
	383
	384	static int
	385	tcpconnect(char *host)
	386	{
	387	struct addrinfo hints, ai, aitop;
	388	char strport[NI_MAXSERV];
	389	int gaierr, s = -1;
	390
	391	snprintf(strport, sizeof strport, "%d", ssh_port);
	392	memset(&hints, 0, sizeof(hints));
	393	hints.ai_family = IPv4or6;
	394	hints.ai_socktype = SOCK_STREAM;
	395	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	396	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	397	for (ai = aitop; ai; ai = ai->ai_next) {
0fff78ff	398	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
3c0ef626	399	if (s < 0) {
	400	error("socket: %s", strerror(errno));
	401	continue;
	402	}
c9f39d2c	403	if (set_nonblock(s) == -1)
c9f39d2c	404	fatal("%s: set_nonblock(%d)", __func__, s);
3c0ef626	405	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	406	errno != EINPROGRESS)
	407	error("connect (`%s'): %s", host, strerror(errno));
	408	else
	409	break;
	410	close(s);
	411	s = -1;
	412	}
	413	freeaddrinfo(aitop);
	414	return s;
	415	}
	416
	417	static int
	418	conalloc(char iname, char oname, int keytype)
	419	{
3c0ef626	420	char namebase, name, *namelist;
41b2f314	421	int s;
3c0ef626	422
	423	namebase = namelist = xstrdup(iname);
	424
	425	do {
	426	name = xstrsep(&namelist, ",");
	427	if (!name) {
	428	xfree(namebase);
	429	return (-1);
	430	}
	431	} while ((s = tcpconnect(name)) < 0);
	432
	433	if (s >= maxfd)
	434	fatal("conalloc: fdno %d too high", s);
	435	if (fdcon[s].c_status)
	436	fatal("conalloc: attempt to reuse fdno %d", s);
	437
	438	fdcon[s].c_fd = s;
	439	fdcon[s].c_status = CS_CON;
	440	fdcon[s].c_namebase = namebase;
	441	fdcon[s].c_name = name;
	442	fdcon[s].c_namelist = namelist;
	443	fdcon[s].c_output_name = xstrdup(oname);
	444	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	445	fdcon[s].c_len = 4;
	446	fdcon[s].c_off = 0;
	447	fdcon[s].c_keytype = keytype;
	448	gettimeofday(&fdcon[s].c_tv, NULL);
	449	fdcon[s].c_tv.tv_sec += timeout;
	450	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	451	FD_SET(s, read_wait);
	452	ncon++;
	453	return (s);
	454	}
	455
	456	static void
	457	confree(int s)
	458	{
	459	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	460	fatal("confree: attempt to free bad fdno %d", s);
	461	close(s);
	462	xfree(fdcon[s].c_namebase);
	463	xfree(fdcon[s].c_output_name);
	464	if (fdcon[s].c_status == CS_KEYS)
	465	xfree(fdcon[s].c_data);
	466	fdcon[s].c_status = CS_UNUSED;
	467	fdcon[s].c_keytype = 0;
	468	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	469	FD_CLR(s, read_wait);
	470	ncon--;
	471	}
	472
	473	static void
	474	contouch(int s)
	475	{
	476	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	477	gettimeofday(&fdcon[s].c_tv, NULL);
	478	fdcon[s].c_tv.tv_sec += timeout;
	479	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	480	}
	481
	482	static int
	483	conrecycle(int s)
	484	{
3c0ef626	485	con *c = &fdcon[s];
41b2f314	486	int ret;
3c0ef626	487
	488	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	489	confree(s);
	490	return (ret);
	491	}
	492
	493	static void
	494	congreet(int s)
	495	{
665a873d	496	int n = 0, remote_major = 0, remote_minor = 0;
3c0ef626	497	char buf[256], *cp;
e9a17296	498	char remote_version[sizeof buf];
3c0ef626	499	size_t bufsiz;
3c0ef626	500	con *c = &fdcon[s];
3c0ef626	501
2c06c99b	502	for (;;) {
	503	memset(buf, '\0', sizeof(buf));
	504	bufsiz = sizeof(buf);
	505	cp = buf;
	506	while (bufsiz-- &&
	507	(n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
	508	if (*cp == '\r')
	509	*cp = '\n';
	510	cp++;
	511	}
	512	if (n != 1 \|\| strncmp(buf, "SSH-", 4) == 0)
	513	break;
3c0ef626	514	}
e9a17296	515	if (n == 0) {
665a873d	516	switch (errno) {
	517	case EPIPE:
	518	error("%s: Connection closed by remote host", c->c_name);
	519	break;
	520	case ECONNREFUSED:
	521	break;
	522	default:
	523	error("read (%s): %s", c->c_name, strerror(errno));
	524	break;
	525	}
e9a17296	526	conrecycle(s);
	527	return;
	528	}
3c0ef626	529	if (cp != '\n' && cp != '\r') {
	530	error("%s: bad greeting", c->c_name);
	531	confree(s);
	532	return;
	533	}
	534	*cp = '\0';
e9a17296	535	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	536	&remote_major, &remote_minor, remote_version) == 3)
	537	compat_datafellows(remote_version);
	538	else
	539	datafellows = 0;
3c0ef626	540	if (c->c_keytype != KT_RSA1) {
3c0ef626	541	if (!ssh2_capable(remote_major, remote_minor)) {
	542	debug("%s doesn't support ssh2", c->c_name);
	543	confree(s);
	544	return;
	545	}
e9a17296	546	} else if (remote_major != 1) {
	547	debug("%s doesn't support ssh1", c->c_name);
	548	confree(s);
	549	return;
3c0ef626	550	}
	551	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	552	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	553	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	554	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
665a873d	555	if (n < 0 \|\| (size_t)n >= sizeof(buf)) {
	556	error("snprintf: buffer too small");
	557	confree(s);
	558	return;
	559	}
	560	if (atomicio(vwrite, s, buf, n) != (size_t)n) {
3c0ef626	561	error("write (%s): %s", c->c_name, strerror(errno));
	562	confree(s);
	563	return;
	564	}
	565	if (c->c_keytype != KT_RSA1) {
	566	keyprint(c, keygrab_ssh2(c));
	567	confree(s);
	568	return;
	569	}
	570	c->c_status = CS_SIZE;
	571	contouch(s);
	572	}
	573
	574	static void
	575	conread(int s)
	576	{
3c0ef626	577	con *c = &fdcon[s];
665a873d	578	size_t n;
3c0ef626	579
	580	if (c->c_status == CS_CON) {
	581	congreet(s);
	582	return;
	583	}
c9f39d2c	584	n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
665a873d	585	if (n == 0) {
3c0ef626	586	error("read (%s): %s", c->c_name, strerror(errno));
	587	confree(s);
	588	return;
	589	}
	590	c->c_off += n;
	591
	592	if (c->c_off == c->c_len)
	593	switch (c->c_status) {
	594	case CS_SIZE:
	595	c->c_plen = htonl(c->c_plen);
	596	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	597	c->c_off = 0;
	598	c->c_data = xmalloc(c->c_len);
	599	c->c_status = CS_KEYS;
	600	break;
	601	case CS_KEYS:
	602	keyprint(c, keygrab_ssh1(c));
	603	confree(s);
	604	return;
	605	break;
	606	default:
	607	fatal("conread: invalid status %d", c->c_status);
	608	break;
	609	}
	610
	611	contouch(s);
	612	}
	613
	614	static void
	615	conloop(void)
	616	{
3c0ef626	617	struct timeval seltime, now;
41b2f314	618	fd_set r, e;
3c0ef626	619	con *c;
41b2f314	620	int i;
3c0ef626	621
3c0ef626	622	gettimeofday(&now, NULL);
f5799ae1	623	c = TAILQ_FIRST(&tq);
3c0ef626	624
	625	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	626	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	627	seltime = c->c_tv;
	628	seltime.tv_sec -= now.tv_sec;
	629	seltime.tv_usec -= now.tv_usec;
	630	if (seltime.tv_usec < 0) {
	631	seltime.tv_usec += 1000000;
	632	seltime.tv_sec--;
	633	}
	634	} else
	635	seltime.tv_sec = seltime.tv_usec = 0;
	636
	637	r = xmalloc(read_wait_size);
	638	memcpy(r, read_wait, read_wait_size);
	639	e = xmalloc(read_wait_size);
	640	memcpy(e, read_wait, read_wait_size);
	641
	642	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	643	(errno == EAGAIN \|\| errno == EINTR))
	644	;
	645
	646	for (i = 0; i < maxfd; i++) {
	647	if (FD_ISSET(i, e)) {
	648	error("%s: exception!", fdcon[i].c_name);
	649	confree(i);
	650	} else if (FD_ISSET(i, r))
	651	conread(i);
	652	}
	653	xfree(r);
	654	xfree(e);
	655
f5799ae1	656	c = TAILQ_FIRST(&tq);
3c0ef626	657	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	658	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	659	int s = c->c_fd;
	660
f5799ae1	661	c = TAILQ_NEXT(c, c_link);
3c0ef626	662	conrecycle(s);
	663	}
	664	}
	665
	666	static void
	667	do_host(char *host)
	668	{
	669	char *name = strnnsep(&host, " \t\n");
	670	int j;
	671
e9a17296	672	if (name == NULL)
e9a17296	673	return;
3c0ef626	674	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	675	if (get_keytypes & j) {
	676	while (ncon >= MAXCON)
	677	conloop();
	678	conalloc(name, *host ? host : name, j);
	679	}
	680	}
	681	}
	682
e9a17296	683	void
e9a17296	684	fatal(const char *fmt,...)
3c0ef626	685	{
e9a17296	686	va_list args;
41b2f314	687
e9a17296	688	va_start(args, fmt);
	689	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	690	va_end(args);
3c0ef626	691	if (nonfatal_fatal)
3c0ef626	692	longjmp(kexjmp, -1);
e9a17296	693	else
cdd66111	694	exit(255);
3c0ef626	695	}
	696
	697	static void
	698	usage(void)
	699	{
996d5e62	700	fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
41b2f314	701	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	702	__progname);
3c0ef626	703	exit(1);
	704	}
	705
	706	int
	707	main(int argc, char **argv)
	708	{
	709	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	710	int opt, fopt_count = 0;
	711	char *tname;
	712
	713	extern int optind;
	714	extern char *optarg;
	715
0fff78ff	716	__progname = ssh_get_progname(argv[0]);
3c0ef626	717	init_rng();
	718	seed_rng();
	719	TAILQ_INIT(&tq);
	720
2c06c99b	721	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
	722	sanitise_stdfd();
	723
3c0ef626	724	if (argc <= 1)
	725	usage();
	726
996d5e62	727	while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
3c0ef626	728	switch (opt) {
996d5e62	729	case 'H':
	730	hash_hosts = 1;
	731	break;
3c0ef626	732	case 'p':
	733	ssh_port = a2port(optarg);
	734	if (ssh_port == 0) {
	735	fprintf(stderr, "Bad port '%s'\n", optarg);
	736	exit(1);
	737	}
	738	break;
	739	case 'T':
41b2f314	740	timeout = convtime(optarg);
	741	if (timeout == -1 \|\| timeout == 0) {
	742	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	743	usage();
41b2f314	744	}
3c0ef626	745	break;
	746	case 'v':
	747	if (!debug_flag) {
	748	debug_flag = 1;
	749	log_level = SYSLOG_LEVEL_DEBUG1;
	750	}
	751	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	752	log_level++;
	753	else
	754	fatal("Too high debugging level.");
	755	break;
	756	case 'f':
	757	if (strcmp(optarg, "-") == 0)
	758	optarg = NULL;
	759	argv[fopt_count++] = optarg;
	760	break;
	761	case 't':
	762	get_keytypes = 0;
	763	tname = strtok(optarg, ",");
	764	while (tname) {
	765	int type = key_type_from_name(tname);
	766	switch (type) {
	767	case KEY_RSA1:
	768	get_keytypes \|= KT_RSA1;
	769	break;
	770	case KEY_DSA:
	771	get_keytypes \|= KT_DSA;
	772	break;
	773	case KEY_RSA:
	774	get_keytypes \|= KT_RSA;
	775	break;
	776	case KEY_UNSPEC:
e9a17296	777	fatal("unknown key type %s", tname);
3c0ef626	778	}
	779	tname = strtok(NULL, ",");
	780	}
	781	break;
	782	case '4':
	783	IPv4or6 = AF_INET;
	784	break;
	785	case '6':
	786	IPv4or6 = AF_INET6;
	787	break;
	788	case '?':
	789	default:
	790	usage();
	791	}
	792	}
	793	if (optind == argc && !fopt_count)
	794	usage();
	795
	796	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	797
	798	maxfd = fdlim_get(1);
	799	if (maxfd < 0)
	800	fatal("%s: fdlim_get: bad value", __progname);
	801	if (maxfd > MAXMAXFD)
	802	maxfd = MAXMAXFD;
	803	if (MAXCON <= 0)
	804	fatal("%s: not enough file descriptors", __progname);
	805	if (maxfd > fdlim_get(0))
	806	fdlim_set(maxfd);
	807	fdcon = xmalloc(maxfd * sizeof(con));
	808	memset(fdcon, 0, maxfd * sizeof(con));
	809
	810	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	811	read_wait = xmalloc(read_wait_size);
	812	memset(read_wait, 0, read_wait_size);
	813
	814	if (fopt_count) {
	815	Linebuf *lb;
	816	char *line;
	817	int j;
	818
	819	for (j = 0; j < fopt_count; j++) {
	820	lb = Linebuf_alloc(argv[j], error);
	821	if (!lb)
	822	continue;
	823	while ((line = Linebuf_getline(lb)) != NULL)
	824	do_host(line);
	825	Linebuf_free(lb);
	826	}
	827	}
	828
	829	while (optind < argc)
	830	do_host(argv[optind++]);
	831
	832	while (ncon > 0)
	833	conloop();
	834
	835	return (0);
	836	}