[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 1.18 2001/03/03 06:53:12 deraadt Exp $");

#if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
#include <sys/queue.h>
#else
#include "fake-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"
#include "atomicio.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 *
Linebuf_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.
 */
static __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)
{
	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;
	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 (atomicio(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 (seltime.tv_usec < 0) {
			seltime.tv_usec += 1000000;
			seltime.tv_sec--;
		}
	} else
		seltime.tv_sec = seltime.tv_usec = 0;

	r = e = read_wait;
	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);
	}

	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 = Linebuf_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));
	memset(fdcon, 0, 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"
2671b47f	11	RCSID("$OpenBSD: ssh-keyscan.c,v 1.18 2001/03/03 06:53:12 deraadt Exp $");
f6fdbddf	12
b705bea0	13	#if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
f6fdbddf	14	#include <sys/queue.h>
bf5f69f7	15	#else
bf3db92d	16	#include "fake-queue.h"
bf5f69f7	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"
2671b47f	29	#include "atomicio.h"
f6fdbddf	30
	31	static int argno = 1; /* Number of argument currently being parsed */
	32
	33	int family = AF_UNSPEC; /* IPv4, IPv6 or both */
	34
f6fdbddf	35	#define MAXMAXFD 256
	36
	37	/* The number of seconds after which to give up on a TCP connection */
	38	int timeout = 5;
	39
	40	int maxfd;
2671b47f	41	#define MAXCON (maxfd - 10)
f6fdbddf	42
1fe6a48f	43	#ifdef HAVE___PROGNAME
	44	extern char *__progname;
	45	#else
	46	char *__progname;
	47	#endif
f6fdbddf	48	fd_set read_wait;
	49	int ncon;
	50
	51	/*
	52	* Keep a connection structure for each file descriptor. The state
	53	* associated with file descriptor n is held in fdcon[n].
	54	*/
	55	typedef struct Connection {
1e3b8b07	56	u_char c_status; /* State of connection on this file desc. */
f6fdbddf	57	#define CS_UNUSED 0 /* File descriptor unused */
	58	#define CS_CON 1 /* Waiting to connect/read greeting */
	59	#define CS_SIZE 2 /* Waiting to read initial packet size */
	60	#define CS_KEYS 3 /* Waiting to read public key packet */
	61	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	62	int c_plen; /* Packet length field for ssh packet */
	63	int c_len; /* Total bytes which must be read. */
	64	int c_off; /* Length of data read so far. */
	65	char c_namebase; / Address to free for c_name and c_namelist */
	66	char c_name; / Hostname of connection for errors */
	67	char c_namelist; / Pointer to other possible addresses */
	68	char c_output_name; / Hostname of connection for output */
	69	char c_data; / Data read from this fd */
	70	struct timeval c_tv; /* Time at which connection gets aborted */
	71	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	72	} con;
	73
	74	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	75	con *fdcon;
	76
	77	/*
	78	* This is just a wrapper around fgets() to make it usable.
	79	*/
	80
	81	/* Stress-test. Increase this later. */
	82	#define LINEBUF_SIZE 16
	83
	84	typedef struct {
	85	char *buf;
1e3b8b07	86	u_int size;
f6fdbddf	87	int lineno;
	88	const char *filename;
	89	FILE *stream;
	90	void (errfun) (const char ,...);
	91	} Linebuf;
	92
778f6940	93	static __inline__ Linebuf *
f6fdbddf	94	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
	95	{
	96	Linebuf *lb;
	97
	98	if (!(lb = malloc(sizeof(*lb)))) {
	99	if (errfun)
	100	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	101	return (NULL);
	102	}
	103	if (filename) {
	104	lb->filename = filename;
	105	if (!(lb->stream = fopen(filename, "r"))) {
b5c334cc	106	xfree(lb);
f6fdbddf	107	if (errfun)
	108	(*errfun) ("%s: %s\n", filename, strerror(errno));
	109	return (NULL);
	110	}
	111	} else {
	112	lb->filename = "(stdin)";
	113	lb->stream = stdin;
	114	}
	115
	116	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	117	if (errfun)
	118	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
b5c334cc	119	xfree(lb);
f6fdbddf	120	return (NULL);
	121	}
	122	lb->errfun = errfun;
	123	lb->lineno = 0;
	124	return (lb);
	125	}
	126
778f6940	127	static __inline__ void
f6fdbddf	128	Linebuf_free(Linebuf * lb)
	129	{
	130	fclose(lb->stream);
b5c334cc	131	xfree(lb->buf);
b5c334cc	132	xfree(lb);
f6fdbddf	133	}
f6fdbddf	134
778f6940	135	static __inline__ void
f6fdbddf	136	Linebuf_restart(Linebuf * lb)
	137	{
	138	clearerr(lb->stream);
	139	rewind(lb->stream);
	140	lb->lineno = 0;
	141	}
	142
778f6940	143	static __inline__ int
f6fdbddf	144	Linebuf_lineno(Linebuf * lb)
	145	{
	146	return (lb->lineno);
	147	}
	148
778f6940	149	static __inline__ char *
5be2ec5e	150	Linebuf_getline(Linebuf * lb)
f6fdbddf	151	{
	152	int n = 0;
	153
	154	lb->lineno++;
	155	for (;;) {
	156	/* Read a line */
	157	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	158	if (ferror(lb->stream) && lb->errfun)
778f6940	159	(*lb->errfun) ("%s: %s\n", lb->filename,
778f6940	160	strerror(errno));
f6fdbddf	161	return (NULL);
	162	}
	163	n = strlen(lb->buf);
	164
	165	/* Return it or an error if it fits */
	166	if (n > 0 && lb->buf[n - 1] == '\n') {
	167	lb->buf[n - 1] = '\0';
	168	return (lb->buf);
	169	}
	170	if (n != lb->size - 1) {
	171	if (lb->errfun)
778f6940	172	(*lb->errfun) ("%s: skipping incomplete last line\n",
778f6940	173	lb->filename);
f6fdbddf	174	return (NULL);
	175	}
	176	/* Double the buffer if we need more space */
	177	if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
	178	if (lb->errfun)
778f6940	179	(*lb->errfun) ("linebuf (%s): realloc failed\n",
778f6940	180	lb->filename);
f6fdbddf	181	return (NULL);
	182	}
	183	}
	184	}
	185
	186	static int
	187	fdlim_get(int hard)
	188	{
f318b98b	189	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	190	struct rlimit rlfd;
778f6940	191
f6fdbddf	192	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	193	return (-1);
	194	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
	195	return 10000;
	196	else
	197	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
b03bd394	198	#elif defined (HAVE_SYSCONF)
	199	return sysconf (_SC_OPEN_MAX);
	200	#else
	201	return 10000;
	202	#endif
f6fdbddf	203	}
	204
	205	static int
	206	fdlim_set(int lim)
	207	{
f318b98b	208	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	209	struct rlimit rlfd;
b03bd394	210	#endif
f6fdbddf	211	if (lim <= 0)
f6fdbddf	212	return (-1);
f318b98b	213	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	214	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	215	return (-1);
	216	rlfd.rlim_cur = lim;
	217	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	218	return (-1);
b03bd394	219	#elif defined (HAVE_SETDTABLESIZE)
b705bea0	220	setdtablesize(lim);
b03bd394	221	#endif
f6fdbddf	222	return (0);
	223	}
	224
	225	/*
	226	* This is an strsep function that returns a null field for adjacent
	227	* separators. This is the same as the 4.4BSD strsep, but different from the
	228	* one in the GNU libc.
	229	*/
778f6940	230	static __inline__ char *
f6fdbddf	231	xstrsep(char *str, const char delim)
	232	{
	233	char s, e;
	234
	235	if (!**str)
	236	return (NULL);
	237
	238	s = *str;
	239	e = s + strcspn(s, delim);
	240
	241	if (*e != '\0')
	242	*e++ = '\0';
	243	*str = e;
	244
	245	return (s);
	246	}
	247
	248	/*
	249	* Get the next non-null token (like GNU strsep). Strsep() will return a
	250	* null token for two adjacent separators, so we may have to loop.
	251	*/
	252	char *
	253	strnnsep(char *stringp, char delim)
	254	{
	255	char *tok;
	256
	257	do {
	258	tok = xstrsep(stringp, delim);
	259	} while (tok && *tok == '\0');
	260	return (tok);
	261	}
	262
	263	void
	264	keyprint(char host, char output_name, char *kd, int len)
	265	{
	266	static Key *rsa;
	267	static Buffer msg;
	268
	269	if (rsa == NULL) {
	270	buffer_init(&msg);
	271	rsa = key_new(KEY_RSA1);
	272	}
	273	buffer_append(&msg, kd, len);
	274	buffer_consume(&msg, 8 - (len & 7)); /* padding */
	275	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
	276	error("%s: invalid packet type", host);
	277	buffer_clear(&msg);
	278	return;
	279	}
	280	buffer_consume(&msg, 8); /* cookie */
	281
	282	/* server key */
	283	(void) buffer_get_int(&msg);
	284	buffer_get_bignum(&msg, rsa->rsa->e);
	285	buffer_get_bignum(&msg, rsa->rsa->n);
	286
	287	/* host key */
	288	(void) buffer_get_int(&msg);
	289	buffer_get_bignum(&msg, rsa->rsa->e);
	290	buffer_get_bignum(&msg, rsa->rsa->n);
	291	buffer_clear(&msg);
	292
	293	fprintf(stdout, "%s ", output_name ? output_name : host);
	294	key_write(rsa, stdout);
295	fputs("\n", stdout);
296	}
297
298	int
299	tcpconnect(char *host)
300	{
301	struct addrinfo hints, ai, aitop;
302	char strport[NI_MAXSERV];
303	int gaierr, s = -1;
304
b5c334cc	305	snprintf(strport, sizeof strport, "%d", SSH_DEFAULT_PORT);
f6fdbddf	306	memset(&hints, 0, sizeof(hints));
	307	hints.ai_family = family;
	308	hints.ai_socktype = SOCK_STREAM;
	309	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	310	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	311	for (ai = aitop; ai; ai = ai->ai_next) {
	312	s = socket(ai->ai_family, SOCK_STREAM, 0);
	313	if (s < 0) {
	314	error("socket: %s", strerror(errno));
	315	continue;
	316	}
eea39c02	317	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
f6fdbddf	318	fatal("F_SETFL: %s", strerror(errno));
	319	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	320	errno != EINPROGRESS)
	321	error("connect (`%s'): %s", host, strerror(errno));
	322	else
	323	break;
	324	close(s);
	325	s = -1;
	326	}
	327	freeaddrinfo(aitop);
	328	return s;
	329	}
	330
	331	int
	332	conalloc(char iname, char oname)
	333	{
	334	int s;
	335	char namebase, name, *namelist;
	336
	337	namebase = namelist = xstrdup(iname);
	338
	339	do {
	340	name = xstrsep(&namelist, ",");
	341	if (!name) {
b5c334cc	342	xfree(namebase);
f6fdbddf	343	return (-1);
	344	}
	345	} while ((s = tcpconnect(name)) < 0);
	346
	347	if (s >= maxfd)
227e8e86	348	fatal("conalloc: fdno %d too high", s);
f6fdbddf	349	if (fdcon[s].c_status)
227e8e86	350	fatal("conalloc: attempt to reuse fdno %d", s);
f6fdbddf	351
	352	fdcon[s].c_fd = s;
	353	fdcon[s].c_status = CS_CON;
	354	fdcon[s].c_namebase = namebase;
	355	fdcon[s].c_name = name;
	356	fdcon[s].c_namelist = namelist;
	357	fdcon[s].c_output_name = xstrdup(oname);
	358	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	359	fdcon[s].c_len = 4;
	360	fdcon[s].c_off = 0;
	361	gettimeofday(&fdcon[s].c_tv, NULL);
	362	fdcon[s].c_tv.tv_sec += timeout;
	363	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	364	FD_SET(s, &read_wait);
	365	ncon++;
	366	return (s);
	367	}
	368
	369	void
	370	confree(int s)
	371	{
f6fdbddf	372	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
227e8e86	373	fatal("confree: attempt to free bad fdno %d", s);
2671b47f	374	close(s);
b5c334cc	375	xfree(fdcon[s].c_namebase);
b5c334cc	376	xfree(fdcon[s].c_output_name);
f6fdbddf	377	if (fdcon[s].c_status == CS_KEYS)
b5c334cc	378	xfree(fdcon[s].c_data);
f6fdbddf	379	fdcon[s].c_status = CS_UNUSED;
	380	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	381	FD_CLR(s, &read_wait);
	382	ncon--;
	383	}
	384
	385	void
	386	contouch(int s)
	387	{
	388	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	389	gettimeofday(&fdcon[s].c_tv, NULL);
	390	fdcon[s].c_tv.tv_sec += timeout;
	391	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	392	}
	393
	394	int
	395	conrecycle(int s)
	396	{
	397	int ret;
	398	con *c = &fdcon[s];
	399	char iname, oname;
	400
	401	iname = xstrdup(c->c_namelist);
b5c334cc	402	oname = xstrdup(c->c_output_name);
f6fdbddf	403	confree(s);
f6fdbddf	404	ret = conalloc(iname, oname);
b5c334cc	405	xfree(iname);
b5c334cc	406	xfree(oname);
f6fdbddf	407	return (ret);
	408	}
	409
	410	void
	411	congreet(int s)
	412	{
	413	char buf[80];
	414	int n;
	415	con *c = &fdcon[s];
	416
	417	n = read(s, buf, sizeof(buf));
	418	if (n < 0) {
	419	if (errno != ECONNREFUSED)
	420	error("read (%s): %s", c->c_name, strerror(errno));
	421	conrecycle(s);
	422	return;
	423	}
	424	if (buf[n - 1] != '\n') {
	425	error("%s: bad greeting", c->c_name);
	426	confree(s);
	427	return;
	428	}
	429	buf[n - 1] = '\0';
	430	fprintf(stderr, "# %s %s\n", c->c_name, buf);
	431	n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
2671b47f	432	if (atomicio(write, s, buf, n) != n) {
f6fdbddf	433	error("write (%s): %s", c->c_name, strerror(errno));
	434	confree(s);
	435	return;
	436	}
	437	c->c_status = CS_SIZE;
	438	contouch(s);
	439	}
	440
	441	void
	442	conread(int s)
	443	{
	444	int n;
	445	con *c = &fdcon[s];
	446
	447	if (c->c_status == CS_CON) {
	448	congreet(s);
	449	return;
	450	}
	451	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	452	if (n < 0) {
	453	error("read (%s): %s", c->c_name, strerror(errno));
	454	confree(s);
	455	return;
	456	}
	457	c->c_off += n;
	458
	459	if (c->c_off == c->c_len)
	460	switch (c->c_status) {
	461	case CS_SIZE:
	462	c->c_plen = htonl(c->c_plen);
	463	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	464	c->c_off = 0;
	465	c->c_data = xmalloc(c->c_len);
	466	c->c_status = CS_KEYS;
	467	break;
	468	case CS_KEYS:
	469	keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
	470	confree(s);
	471	return;
	472	break;
	473	default:
227e8e86	474	fatal("conread: invalid status %d", c->c_status);
f6fdbddf	475	break;
	476	}
	477
	478	contouch(s);
	479	}
	480
	481	void
	482	conloop(void)
	483	{
	484	fd_set r, e;
	485	struct timeval seltime, now;
	486	int i;
	487	con *c;
	488
	489	gettimeofday(&now, NULL);
	490	c = tq.tqh_first;
	491
2671b47f	492	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
2671b47f	493	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
f6fdbddf	494	seltime = c->c_tv;
	495	seltime.tv_sec -= now.tv_sec;
	496	seltime.tv_usec -= now.tv_usec;
5be2ec5e	497	if (seltime.tv_usec < 0) {
f6fdbddf	498	seltime.tv_usec += 1000000;
	499	seltime.tv_sec--;
	500	}
	501	} else
	502	seltime.tv_sec = seltime.tv_usec = 0;
	503
	504	r = e = read_wait;
fd193ca4	505	while (select(maxfd, &r, NULL, &e, &seltime) == -1 &&
	506	(errno == EAGAIN \|\| errno == EINTR))
	507	;
	508
2671b47f	509	for (i = 0; i < maxfd; i++) {
f6fdbddf	510	if (FD_ISSET(i, &e)) {
	511	error("%s: exception!", fdcon[i].c_name);
	512	confree(i);
	513	} else if (FD_ISSET(i, &r))
	514	conread(i);
2671b47f	515	}
f6fdbddf	516
f6fdbddf	517	c = tq.tqh_first;
2671b47f	518	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
2671b47f	519	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
f6fdbddf	520	int s = c->c_fd;
2671b47f	521
f6fdbddf	522	c = c->c_link.tqe_next;
	523	conrecycle(s);
	524	}
	525	}
	526
	527	char *
	528	nexthost(int argc, char **argv)
	529	{
	530	static Linebuf *lb;
	531
	532	for (;;) {
	533	if (!lb) {
	534	if (argno >= argc)
	535	return (NULL);
	536	if (argv[argno][0] != '-')
	537	return (argv[argno++]);
	538	if (!strcmp(argv[argno], "--")) {
	539	if (++argno >= argc)
	540	return (NULL);
	541	return (argv[argno++]);
	542	} else if (!strncmp(argv[argno], "-f", 2)) {
	543	char *fname;
2671b47f	544
f6fdbddf	545	if (argv[argno][2])
	546	fname = &argv[argno++][2];
	547	else if (++argno >= argc) {
	548	error("missing filename for `-f'");
	549	return (NULL);
	550	} else
	551	fname = argv[argno++];
	552	if (!strcmp(fname, "-"))
	553	fname = NULL;
f20255cb	554	lb = Linebuf_alloc(fname, error);
f6fdbddf	555	} else
2671b47f	556	error("ignoring invalid/misplaced option `%s'",
2671b47f	557	argv[argno++]);
f6fdbddf	558	} else {
f6fdbddf	559	char *line;
2671b47f	560
5be2ec5e	561	line = Linebuf_getline(lb);
f6fdbddf	562	if (line)
	563	return (line);
	564	Linebuf_free(lb);
	565	lb = NULL;
	566	}
	567	}
	568	}
	569
	570	static void
	571	usage(void)
	572	{
227e8e86	573	fatal("usage: %s [-t timeout] { [--] host \| -f file } ...", __progname);
f6fdbddf	574	return;
	575	}
	576
	577	int
	578	main(int argc, char **argv)
	579	{
	580	char *host = NULL;
	581
1fe6a48f	582	__progname = get_progname(argv[0]);
f6fdbddf	583	TAILQ_INIT(&tq);
f6fdbddf	584
f6fdbddf	585	if (argc <= argno)
	586	usage();
	587
	588	if (argv[1][0] == '-' && argv[1][1] == 't') {
	589	argno++;
	590	if (argv[1][2])
	591	timeout = atoi(&argv[1][2]);
	592	else {
	593	if (argno >= argc)
	594	usage();
	595	timeout = atoi(argv[argno++]);
	596	}
	597	if (timeout <= 0)
	598	usage();
	599	}
	600	if (argc <= argno)
	601	usage();
	602
	603	maxfd = fdlim_get(1);
	604	if (maxfd < 0)
227e8e86	605	fatal("%s: fdlim_get: bad value", __progname);
f6fdbddf	606	if (maxfd > MAXMAXFD)
f6fdbddf	607	maxfd = MAXMAXFD;
2671b47f	608	if (MAXCON <= 0)
227e8e86	609	fatal("%s: not enough file descriptors", __progname);
f6fdbddf	610	if (maxfd > fdlim_get(0))
	611	fdlim_set(maxfd);
	612	fdcon = xmalloc(maxfd * sizeof(con));
5be2ec5e	613	memset(fdcon, 0, maxfd * sizeof(con));
f6fdbddf	614
f6fdbddf	615	do {
2671b47f	616	while (ncon < MAXCON) {
f6fdbddf	617	char *name;
	618
	619	host = nexthost(argc, argv);
	620	if (host == NULL)
	621	break;
	622	name = strnnsep(&host, " \t\n");
	623	conalloc(name, *host ? host : name);
	624	}
	625	conloop();
	626	} while (host);
	627	while (ncon > 0)
	628	conloop();
	629
	630	return (0);
	631	}