[openssh.git] / 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 (for instance by leaving this copyright notice
 * intact).
 */

#include "includes.h"
RCSID("$OpenBSD: ssh-keyscan.c,v 1.11 2001/01/21 19:05:57 markus Exp $");

#if defined(HAVE_SYS_QUEUE_H)  &&  !defined(HAVE_BOGUS_SYS_QUEUE_H)
#include <sys/queue.h>
#else
#include "bsd-queue.h"
#endif
#include <errno.h>

#include <openssl/bn.h>

#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "key.h"
#include "buffer.h"
#include "bufaux.h"
#include "log.h"

static int argno = 1;		/* Number of argument currently being parsed */

int family = AF_UNSPEC;		/* IPv4, IPv6 or both */

#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;
int ncon;

/*
 * 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. */
	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 */
	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 inline 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", lb->filename);
		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 inline void
Linebuf_free(Linebuf * lb)
{
	fclose(lb->stream);
	xfree(lb->buf);
	xfree(lb);
}

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

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

static inline char *
getline(Linebuf * lb)
{
	int n = 0;

	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 */
		if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
			if (lb->errfun)
				(*lb->errfun) ("linebuf (%s): realloc failed\n", lb->filename);
			return (NULL);
		}
	}
}

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.
 */
inline 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.
 */
char *
strnnsep(char **stringp, char *delim)
{
	char *tok;

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

void
keyprint(char *host, char *output_name, char *kd, int len)
{
	static Key *rsa;
	static Buffer msg;

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

	fprintf(stdout, "%s ", output_name ? output_name : host);
	key_write(rsa, stdout);
	fputs("\n", stdout);
}

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

	snprintf(strport, sizeof strport, "%d", SSH_DEFAULT_PORT);
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = family;
	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, SOCK_STREAM, 0);
		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;
}

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

	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;
	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);
}

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

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);
}

int
conrecycle(int s)
{
	int ret;
	con *c = &fdcon[s];
	char *iname, *oname;

	iname = xstrdup(c->c_namelist);
	oname = xstrdup(c->c_output_name);
	confree(s);
	ret = conalloc(iname, oname);
	xfree(iname);
	xfree(oname);
	return (ret);
}

void
congreet(int s)
{
	char buf[80];
	int n;
	con *c = &fdcon[s];

	n = read(s, buf, sizeof(buf));
	if (n < 0) {
		if (errno != ECONNREFUSED)
			error("read (%s): %s", c->c_name, strerror(errno));
		conrecycle(s);
		return;
	}
	if (buf[n - 1] != '\n') {
		error("%s: bad greeting", c->c_name);
		confree(s);
		return;
	}
	buf[n - 1] = '\0';
	fprintf(stderr, "# %s %s\n", c->c_name, buf);
	n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
	if (write(s, buf, n) != n) {
		error("write (%s): %s", c->c_name, strerror(errno));
		confree(s);
		return;
	}
	c->c_status = CS_SIZE;
	contouch(s);
}

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

	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->c_name, c->c_output_name, c->c_data, c->c_plen);
			confree(s);
			return;
			break;
		default:
			fatal("conread: invalid status %d", c->c_status);
			break;
		}

	contouch(s);
}

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

	gettimeofday(&now, NULL);
	c = tq.tqh_first;

	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 ((int) seltime.tv_usec < 0) {
			seltime.tv_usec += 1000000;
			seltime.tv_sec--;
		}
	} else
		seltime.tv_sec = seltime.tv_usec = 0;

	r = e = read_wait;
	select(maxfd, &r, NULL, &e, &seltime);
	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);

	c = tq.tqh_first;
	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 = c->c_link.tqe_next;
		conrecycle(s);
	}
}

char *
nexthost(int argc, char **argv)
{
	static Linebuf *lb;

	for (;;) {
		if (!lb) {
			if (argno >= argc)
				return (NULL);
			if (argv[argno][0] != '-')
				return (argv[argno++]);
			if (!strcmp(argv[argno], "--")) {
				if (++argno >= argc)
					return (NULL);
				return (argv[argno++]);
			} else if (!strncmp(argv[argno], "-f", 2)) {
				char *fname;
				if (argv[argno][2])
					fname = &argv[argno++][2];
				else if (++argno >= argc) {
					error("missing filename for `-f'");
					return (NULL);
				} else
					fname = argv[argno++];
				if (!strcmp(fname, "-"))
					fname = NULL;
				lb = Linebuf_alloc(fname, error);
			} else
				error("ignoring invalid/misplaced option `%s'", argv[argno++]);
		} else {
			char *line;
			line = getline(lb);
			if (line)
				return (line);
			Linebuf_free(lb);
			lb = NULL;
		}
	}
}

static void
usage(void)
{
	fatal("usage: %s [-t timeout] { [--] host | -f file } ...", __progname);
	return;
}

int
main(int argc, char **argv)
{
	char *host = NULL;

	__progname = get_progname(argv[0]);
	TAILQ_INIT(&tq);

	if (argc <= argno)
		usage();

	if (argv[1][0] == '-' && argv[1][1] == 't') {
		argno++;
		if (argv[1][2])
			timeout = atoi(&argv[1][2]);
		else {
			if (argno >= argc)
				usage();
			timeout = atoi(argv[argno++]);
		}
		if (timeout <= 0)
			usage();
	}
	if (argc <= argno)
		usage();

	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));

	do {
		while (ncon < maxcon) {
			char *name;

			host = nexthost(argc, argv);
			if (host == NULL)
				break;
			name = strnnsep(&host, " \t\n");
			conalloc(name, *host ? host : name);
		}
		conloop();
	} while (host);
	while (ncon > 0)
		conloop();

	return (0);
}
Commit	Line	Data
f6fdbddf	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 (for instance by leaving this copyright notice
	7	* intact).
	8	*/
	9
	10	#include "includes.h"
42f11eb2	11	RCSID("$OpenBSD: ssh-keyscan.c,v 1.11 2001/01/21 19:05:57 markus Exp $");
f6fdbddf	12
0dd78cd8	13	#if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
f6fdbddf	14	#include <sys/queue.h>
bf5f69f7	15	#else
	16	#include "bsd-queue.h"
	17	#endif
f6fdbddf	18	#include <errno.h>
	19
	20	#include <openssl/bn.h>
f6fdbddf	21
	22	#include "xmalloc.h"
	23	#include "ssh.h"
42f11eb2	24	#include "ssh1.h"
f6fdbddf	25	#include "key.h"
	26	#include "buffer.h"
	27	#include "bufaux.h"
42f11eb2	28	#include "log.h"
f6fdbddf	29
	30	static int argno = 1; /* Number of argument currently being parsed */
	31
	32	int family = AF_UNSPEC; /* IPv4, IPv6 or both */
	33
f6fdbddf	34	#define MAXMAXFD 256
	35
	36	/* The number of seconds after which to give up on a TCP connection */
	37	int timeout = 5;
	38
	39	int maxfd;
	40	#define maxcon (maxfd - 10)
	41
1fe6a48f	42	#ifdef HAVE___PROGNAME
	43	extern char *__progname;
	44	#else
	45	char *__progname;
	46	#endif
f6fdbddf	47	fd_set read_wait;
	48	int ncon;
	49
	50	/*
	51	* Keep a connection structure for each file descriptor. The state
	52	* associated with file descriptor n is held in fdcon[n].
	53	*/
	54	typedef struct Connection {
1e3b8b07	55	u_char c_status; /* State of connection on this file desc. */
f6fdbddf	56	#define CS_UNUSED 0 /* File descriptor unused */
	57	#define CS_CON 1 /* Waiting to connect/read greeting */
	58	#define CS_SIZE 2 /* Waiting to read initial packet size */
	59	#define CS_KEYS 3 /* Waiting to read public key packet */
	60	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	61	int c_plen; /* Packet length field for ssh packet */
	62	int c_len; /* Total bytes which must be read. */
	63	int c_off; /* Length of data read so far. */
	64	char c_namebase; / Address to free for c_name and c_namelist */
	65	char c_name; / Hostname of connection for errors */
	66	char c_namelist; / Pointer to other possible addresses */
	67	char c_output_name; / Hostname of connection for output */
	68	char c_data; / Data read from this fd */
	69	struct timeval c_tv; /* Time at which connection gets aborted */
	70	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	71	} con;
	72
	73	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	74	con *fdcon;
	75
	76	/*
	77	* This is just a wrapper around fgets() to make it usable.
	78	*/
	79
	80	/* Stress-test. Increase this later. */
	81	#define LINEBUF_SIZE 16
	82
	83	typedef struct {
	84	char *buf;
1e3b8b07	85	u_int size;
f6fdbddf	86	int lineno;
	87	const char *filename;
	88	FILE *stream;
	89	void (errfun) (const char ,...);
	90	} Linebuf;
	91
	92	static inline Linebuf *
	93	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
	94	{
	95	Linebuf *lb;
	96
	97	if (!(lb = malloc(sizeof(*lb)))) {
	98	if (errfun)
	99	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	100	return (NULL);
	101	}
	102	if (filename) {
	103	lb->filename = filename;
	104	if (!(lb->stream = fopen(filename, "r"))) {
b5c334cc	105	xfree(lb);
f6fdbddf	106	if (errfun)
	107	(*errfun) ("%s: %s\n", filename, strerror(errno));
	108	return (NULL);
	109	}
	110	} else {
	111	lb->filename = "(stdin)";
	112	lb->stream = stdin;
	113	}
	114
	115	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	116	if (errfun)
	117	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
b5c334cc	118	xfree(lb);
f6fdbddf	119	return (NULL);
	120	}
	121	lb->errfun = errfun;
	122	lb->lineno = 0;
	123	return (lb);
	124	}
	125
	126	static inline void
	127	Linebuf_free(Linebuf * lb)
	128	{
	129	fclose(lb->stream);
b5c334cc	130	xfree(lb->buf);
b5c334cc	131	xfree(lb);
f6fdbddf	132	}
	133
	134	static inline void
	135	Linebuf_restart(Linebuf * lb)
	136	{
	137	clearerr(lb->stream);
	138	rewind(lb->stream);
	139	lb->lineno = 0;
	140	}
	141
	142	static inline int
	143	Linebuf_lineno(Linebuf * lb)
	144	{
	145	return (lb->lineno);
	146	}
	147
	148	static inline char *
	149	getline(Linebuf * lb)
	150	{
	151	int n = 0;
	152
	153	lb->lineno++;
	154	for (;;) {
	155	/* Read a line */
	156	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	157	if (ferror(lb->stream) && lb->errfun)
	158	(*lb->errfun) ("%s: %s\n", lb->filename, strerror(errno));
	159	return (NULL);
	160	}
	161	n = strlen(lb->buf);
	162
	163	/* Return it or an error if it fits */
	164	if (n > 0 && lb->buf[n - 1] == '\n') {
	165	lb->buf[n - 1] = '\0';
	166	return (lb->buf);
	167	}
	168	if (n != lb->size - 1) {
	169	if (lb->errfun)
	170	(*lb->errfun) ("%s: skipping incomplete last line\n", lb->filename);
	171	return (NULL);
	172	}
	173	/* Double the buffer if we need more space */
	174	if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
	175	if (lb->errfun)
	176	(*lb->errfun) ("linebuf (%s): realloc failed\n", lb->filename);
	177	return (NULL);
	178	}
	179	}
	180	}
	181
	182	static int
	183	fdlim_get(int hard)
	184	{
f318b98b	185	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	186	struct rlimit rlfd;
	187	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	188	return (-1);
	189	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
	190	return 10000;
	191	else
	192	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
b03bd394	193	#elif defined (HAVE_SYSCONF)
	194	return sysconf (_SC_OPEN_MAX);
	195	#else
	196	return 10000;
	197	#endif
f6fdbddf	198	}
	199
	200	static int
	201	fdlim_set(int lim)
	202	{
f318b98b	203	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	204	struct rlimit rlfd;
b03bd394	205	#endif
f6fdbddf	206	if (lim <= 0)
f6fdbddf	207	return (-1);
f318b98b	208	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	209	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	210	return (-1);
	211	rlfd.rlim_cur = lim;
	212	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	213	return (-1);
b03bd394	214	#elif defined (HAVE_SETDTABLESIZE)
	215	setdtablesize (lim);
	216	#endif
f6fdbddf	217	return (0);
	218	}
	219
	220	/*
	221	* This is an strsep function that returns a null field for adjacent
	222	* separators. This is the same as the 4.4BSD strsep, but different from the
	223	* one in the GNU libc.
	224	*/
	225	inline char *
	226	xstrsep(char *str, const char delim)
	227	{
	228	char s, e;
	229
	230	if (!**str)
	231	return (NULL);
	232
	233	s = *str;
	234	e = s + strcspn(s, delim);
	235
	236	if (*e != '\0')
	237	*e++ = '\0';
	238	*str = e;
	239
	240	return (s);
	241	}
	242
	243	/*
	244	* Get the next non-null token (like GNU strsep). Strsep() will return a
	245	* null token for two adjacent separators, so we may have to loop.
	246	*/
	247	char *
	248	strnnsep(char *stringp, char delim)
	249	{
	250	char *tok;
	251
	252	do {
	253	tok = xstrsep(stringp, delim);
	254	} while (tok && *tok == '\0');
	255	return (tok);
	256	}
	257
	258	void
	259	keyprint(char host, char output_name, char *kd, int len)
	260	{
	261	static Key *rsa;
	262	static Buffer msg;
	263
	264	if (rsa == NULL) {
	265	buffer_init(&msg);
	266	rsa = key_new(KEY_RSA1);
	267	}
	268	buffer_append(&msg, kd, len);
	269	buffer_consume(&msg, 8 - (len & 7)); /* padding */
	270	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
	271	error("%s: invalid packet type", host);
	272	buffer_clear(&msg);
	273	return;
	274	}
	275	buffer_consume(&msg, 8); /* cookie */
	276
	277	/* server key */
	278	(void) buffer_get_int(&msg);
	279	buffer_get_bignum(&msg, rsa->rsa->e);
	280	buffer_get_bignum(&msg, rsa->rsa->n);
281
282	/* host key */
283	(void) buffer_get_int(&msg);
284	buffer_get_bignum(&msg, rsa->rsa->e);
285	buffer_get_bignum(&msg, rsa->rsa->n);
286	buffer_clear(&msg);
287
288	fprintf(stdout, "%s ", output_name ? output_name : host);
289	key_write(rsa, stdout);
290	fputs("\n", stdout);
291	}
292
293	int
294	tcpconnect(char *host)
295	{
296	struct addrinfo hints, ai, aitop;
297	char strport[NI_MAXSERV];
298	int gaierr, s = -1;
299
b5c334cc	300	snprintf(strport, sizeof strport, "%d", SSH_DEFAULT_PORT);
f6fdbddf	301	memset(&hints, 0, sizeof(hints));
	302	hints.ai_family = family;
	303	hints.ai_socktype = SOCK_STREAM;
	304	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	305	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	306	for (ai = aitop; ai; ai = ai->ai_next) {
	307	s = socket(ai->ai_family, SOCK_STREAM, 0);
	308	if (s < 0) {
	309	error("socket: %s", strerror(errno));
	310	continue;
	311	}
eea39c02	312	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
f6fdbddf	313	fatal("F_SETFL: %s", strerror(errno));
	314	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	315	errno != EINPROGRESS)
	316	error("connect (`%s'): %s", host, strerror(errno));
	317	else
	318	break;
	319	close(s);
	320	s = -1;
	321	}
	322	freeaddrinfo(aitop);
	323	return s;
	324	}
	325
	326	int
	327	conalloc(char iname, char oname)
	328	{
	329	int s;
	330	char namebase, name, *namelist;
	331
	332	namebase = namelist = xstrdup(iname);
	333
	334	do {
	335	name = xstrsep(&namelist, ",");
	336	if (!name) {
b5c334cc	337	xfree(namebase);
f6fdbddf	338	return (-1);
	339	}
	340	} while ((s = tcpconnect(name)) < 0);
	341
	342	if (s >= maxfd)
227e8e86	343	fatal("conalloc: fdno %d too high", s);
f6fdbddf	344	if (fdcon[s].c_status)
227e8e86	345	fatal("conalloc: attempt to reuse fdno %d", s);
f6fdbddf	346
	347	fdcon[s].c_fd = s;
	348	fdcon[s].c_status = CS_CON;
	349	fdcon[s].c_namebase = namebase;
	350	fdcon[s].c_name = name;
	351	fdcon[s].c_namelist = namelist;
	352	fdcon[s].c_output_name = xstrdup(oname);
	353	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	354	fdcon[s].c_len = 4;
	355	fdcon[s].c_off = 0;
	356	gettimeofday(&fdcon[s].c_tv, NULL);
	357	fdcon[s].c_tv.tv_sec += timeout;
	358	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	359	FD_SET(s, &read_wait);
	360	ncon++;
	361	return (s);
	362	}
	363
	364	void
	365	confree(int s)
	366	{
	367	close(s);
	368	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
227e8e86	369	fatal("confree: attempt to free bad fdno %d", s);
b5c334cc	370	xfree(fdcon[s].c_namebase);
b5c334cc	371	xfree(fdcon[s].c_output_name);
f6fdbddf	372	if (fdcon[s].c_status == CS_KEYS)
b5c334cc	373	xfree(fdcon[s].c_data);
f6fdbddf	374	fdcon[s].c_status = CS_UNUSED;
	375	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	376	FD_CLR(s, &read_wait);
	377	ncon--;
	378	}
	379
	380	void
	381	contouch(int s)
	382	{
	383	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	384	gettimeofday(&fdcon[s].c_tv, NULL);
	385	fdcon[s].c_tv.tv_sec += timeout;
	386	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	387	}
	388
	389	int
	390	conrecycle(int s)
	391	{
	392	int ret;
	393	con *c = &fdcon[s];
	394	char iname, oname;
	395
	396	iname = xstrdup(c->c_namelist);
b5c334cc	397	oname = xstrdup(c->c_output_name);
f6fdbddf	398	confree(s);
f6fdbddf	399	ret = conalloc(iname, oname);
b5c334cc	400	xfree(iname);
b5c334cc	401	xfree(oname);
f6fdbddf	402	return (ret);
	403	}
	404
	405	void
	406	congreet(int s)
	407	{
	408	char buf[80];
	409	int n;
	410	con *c = &fdcon[s];
	411
	412	n = read(s, buf, sizeof(buf));
	413	if (n < 0) {
	414	if (errno != ECONNREFUSED)
	415	error("read (%s): %s", c->c_name, strerror(errno));
	416	conrecycle(s);
	417	return;
	418	}
	419	if (buf[n - 1] != '\n') {
	420	error("%s: bad greeting", c->c_name);
	421	confree(s);
	422	return;
	423	}
	424	buf[n - 1] = '\0';
	425	fprintf(stderr, "# %s %s\n", c->c_name, buf);
	426	n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
	427	if (write(s, buf, n) != n) {
	428	error("write (%s): %s", c->c_name, strerror(errno));
	429	confree(s);
	430	return;
	431	}
	432	c->c_status = CS_SIZE;
	433	contouch(s);
	434	}
	435
	436	void
	437	conread(int s)
	438	{
	439	int n;
	440	con *c = &fdcon[s];
	441
	442	if (c->c_status == CS_CON) {
	443	congreet(s);
	444	return;
	445	}
	446	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	447	if (n < 0) {
	448	error("read (%s): %s", c->c_name, strerror(errno));
	449	confree(s);
	450	return;
	451	}
	452	c->c_off += n;
	453
	454	if (c->c_off == c->c_len)
	455	switch (c->c_status) {
	456	case CS_SIZE:
	457	c->c_plen = htonl(c->c_plen);
	458	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	459	c->c_off = 0;
	460	c->c_data = xmalloc(c->c_len);
	461	c->c_status = CS_KEYS;
	462	break;
	463	case CS_KEYS:
	464	keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
	465	confree(s);
466	return;
467	break;
468	default:
227e8e86	469	fatal("conread: invalid status %d", c->c_status);
f6fdbddf	470	break;
	471	}
	472
	473	contouch(s);
	474	}
	475
	476	void
	477	conloop(void)
	478	{
	479	fd_set r, e;
	480	struct timeval seltime, now;
	481	int i;
	482	con *c;
	483
	484	gettimeofday(&now, NULL);
	485	c = tq.tqh_first;
	486
	487	if (c &&
	488	(c->c_tv.tv_sec > now.tv_sec \|\|
	489	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	490	seltime = c->c_tv;
	491	seltime.tv_sec -= now.tv_sec;
	492	seltime.tv_usec -= now.tv_usec;
	493	if ((int) seltime.tv_usec < 0) {
	494	seltime.tv_usec += 1000000;
	495	seltime.tv_sec--;
	496	}
	497	} else
	498	seltime.tv_sec = seltime.tv_usec = 0;
	499
	500	r = e = read_wait;
	501	select(maxfd, &r, NULL, &e, &seltime);
	502	for (i = 0; i < maxfd; i++)
	503	if (FD_ISSET(i, &e)) {
	504	error("%s: exception!", fdcon[i].c_name);
	505	confree(i);
	506	} else if (FD_ISSET(i, &r))
	507	conread(i);
	508
	509	c = tq.tqh_first;
	510	while (c &&
	511	(c->c_tv.tv_sec < now.tv_sec \|\|
	512	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	513	int s = c->c_fd;
	514	c = c->c_link.tqe_next;
	515	conrecycle(s);
	516	}
	517	}
	518
	519	char *
	520	nexthost(int argc, char **argv)
	521	{
	522	static Linebuf *lb;
	523
	524	for (;;) {
	525	if (!lb) {
	526	if (argno >= argc)
	527	return (NULL);
	528	if (argv[argno][0] != '-')
	529	return (argv[argno++]);
	530	if (!strcmp(argv[argno], "--")) {
	531	if (++argno >= argc)
	532	return (NULL);
	533	return (argv[argno++]);
534	} else if (!strncmp(argv[argno], "-f", 2)) {
535	char *fname;
536	if (argv[argno][2])
537	fname = &argv[argno++][2];
538	else if (++argno >= argc) {
539	error("missing filename for `-f'");
540	return (NULL);
541	} else
542	fname = argv[argno++];
543	if (!strcmp(fname, "-"))
544	fname = NULL;
f20255cb	545	lb = Linebuf_alloc(fname, error);
f6fdbddf	546	} else
	547	error("ignoring invalid/misplaced option `%s'", argv[argno++]);
	548	} else {
	549	char *line;
	550	line = getline(lb);
	551	if (line)
	552	return (line);
	553	Linebuf_free(lb);
	554	lb = NULL;
	555	}
	556	}
	557	}
	558
	559	static void
	560	usage(void)
	561	{
227e8e86	562	fatal("usage: %s [-t timeout] { [--] host \| -f file } ...", __progname);
f6fdbddf	563	return;
	564	}
	565
	566	int
	567	main(int argc, char **argv)
	568	{
	569	char *host = NULL;
	570
1fe6a48f	571	__progname = get_progname(argv[0]);
f6fdbddf	572	TAILQ_INIT(&tq);
f6fdbddf	573
f6fdbddf	574	if (argc <= argno)
	575	usage();
	576
	577	if (argv[1][0] == '-' && argv[1][1] == 't') {
	578	argno++;
	579	if (argv[1][2])
	580	timeout = atoi(&argv[1][2]);
	581	else {
	582	if (argno >= argc)
	583	usage();
	584	timeout = atoi(argv[argno++]);
	585	}
	586	if (timeout <= 0)
	587	usage();
	588	}
	589	if (argc <= argno)
	590	usage();
	591
	592	maxfd = fdlim_get(1);
	593	if (maxfd < 0)
227e8e86	594	fatal("%s: fdlim_get: bad value", __progname);
f6fdbddf	595	if (maxfd > MAXMAXFD)
	596	maxfd = MAXMAXFD;
	597	if (maxcon <= 0)
227e8e86	598	fatal("%s: not enough file descriptors", __progname);
f6fdbddf	599	if (maxfd > fdlim_get(0))
	600	fdlim_set(maxfd);
	601	fdcon = xmalloc(maxfd * sizeof(con));
	602
	603	do {
	604	while (ncon < maxcon) {
	605	char *name;
	606
	607	host = nexthost(argc, argv);
	608	if (host == NULL)
	609	break;
	610	name = strnnsep(&host, " \t\n");
	611	conalloc(name, *host ? host : name);
	612	}
	613	conloop();
	614	} while (host);
	615	while (ncon > 0)
	616	conloop();
	617
	618	return (0);
	619	}