[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 1.19 2001/03/03 21:19:41 millert 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;
size_t read_wait_size;
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 = 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 = 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));

	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	read_wait = xmalloc(read_wait_size);
	memset(read_wait, 0, read_wait_size);

	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"
ff7fee59	11	RCSID("$OpenBSD: ssh-keyscan.c,v 1.19 2001/03/03 21:19:41 millert 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
ff7fee59	48	fd_set *read_wait;
ff7fee59	49	size_t read_wait_size;
f6fdbddf	50	int ncon;
	51
	52	/*
	53	* Keep a connection structure for each file descriptor. The state
	54	* associated with file descriptor n is held in fdcon[n].
	55	*/
	56	typedef struct Connection {
1e3b8b07	57	u_char c_status; /* State of connection on this file desc. */
f6fdbddf	58	#define CS_UNUSED 0 /* File descriptor unused */
	59	#define CS_CON 1 /* Waiting to connect/read greeting */
	60	#define CS_SIZE 2 /* Waiting to read initial packet size */
	61	#define CS_KEYS 3 /* Waiting to read public key packet */
	62	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	63	int c_plen; /* Packet length field for ssh packet */
	64	int c_len; /* Total bytes which must be read. */
	65	int c_off; /* Length of data read so far. */
	66	char c_namebase; / Address to free for c_name and c_namelist */
	67	char c_name; / Hostname of connection for errors */
	68	char c_namelist; / Pointer to other possible addresses */
	69	char c_output_name; / Hostname of connection for output */
	70	char c_data; / Data read from this fd */
	71	struct timeval c_tv; /* Time at which connection gets aborted */
	72	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	73	} con;
	74
	75	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	76	con *fdcon;
	77
	78	/*
	79	* This is just a wrapper around fgets() to make it usable.
	80	*/
	81
	82	/* Stress-test. Increase this later. */
	83	#define LINEBUF_SIZE 16
	84
	85	typedef struct {
	86	char *buf;
1e3b8b07	87	u_int size;
f6fdbddf	88	int lineno;
	89	const char *filename;
	90	FILE *stream;
	91	void (errfun) (const char ,...);
	92	} Linebuf;
	93
778f6940	94	static __inline__ Linebuf *
f6fdbddf	95	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
	96	{
	97	Linebuf *lb;
	98
	99	if (!(lb = malloc(sizeof(*lb)))) {
	100	if (errfun)
	101	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	102	return (NULL);
	103	}
	104	if (filename) {
	105	lb->filename = filename;
	106	if (!(lb->stream = fopen(filename, "r"))) {
b5c334cc	107	xfree(lb);
f6fdbddf	108	if (errfun)
	109	(*errfun) ("%s: %s\n", filename, strerror(errno));
	110	return (NULL);
	111	}
	112	} else {
	113	lb->filename = "(stdin)";
	114	lb->stream = stdin;
	115	}
	116
	117	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	118	if (errfun)
	119	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
b5c334cc	120	xfree(lb);
f6fdbddf	121	return (NULL);
	122	}
	123	lb->errfun = errfun;
	124	lb->lineno = 0;
	125	return (lb);
	126	}
	127
778f6940	128	static __inline__ void
f6fdbddf	129	Linebuf_free(Linebuf * lb)
	130	{
	131	fclose(lb->stream);
b5c334cc	132	xfree(lb->buf);
b5c334cc	133	xfree(lb);
f6fdbddf	134	}
f6fdbddf	135
778f6940	136	static __inline__ void
f6fdbddf	137	Linebuf_restart(Linebuf * lb)
	138	{
	139	clearerr(lb->stream);
	140	rewind(lb->stream);
	141	lb->lineno = 0;
	142	}
	143
778f6940	144	static __inline__ int
f6fdbddf	145	Linebuf_lineno(Linebuf * lb)
	146	{
	147	return (lb->lineno);
	148	}
	149
778f6940	150	static __inline__ char *
5be2ec5e	151	Linebuf_getline(Linebuf * lb)
f6fdbddf	152	{
	153	int n = 0;
	154
	155	lb->lineno++;
	156	for (;;) {
	157	/* Read a line */
	158	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	159	if (ferror(lb->stream) && lb->errfun)
778f6940	160	(*lb->errfun) ("%s: %s\n", lb->filename,
778f6940	161	strerror(errno));
f6fdbddf	162	return (NULL);
	163	}
	164	n = strlen(lb->buf);
	165
	166	/* Return it or an error if it fits */
	167	if (n > 0 && lb->buf[n - 1] == '\n') {
	168	lb->buf[n - 1] = '\0';
	169	return (lb->buf);
	170	}
	171	if (n != lb->size - 1) {
	172	if (lb->errfun)
778f6940	173	(*lb->errfun) ("%s: skipping incomplete last line\n",
778f6940	174	lb->filename);
f6fdbddf	175	return (NULL);
	176	}
	177	/* Double the buffer if we need more space */
	178	if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
	179	if (lb->errfun)
778f6940	180	(*lb->errfun) ("linebuf (%s): realloc failed\n",
778f6940	181	lb->filename);
f6fdbddf	182	return (NULL);
	183	}
	184	}
	185	}
	186
	187	static int
	188	fdlim_get(int hard)
	189	{
f318b98b	190	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	191	struct rlimit rlfd;
778f6940	192
f6fdbddf	193	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	194	return (-1);
	195	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
	196	return 10000;
	197	else
	198	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
b03bd394	199	#elif defined (HAVE_SYSCONF)
	200	return sysconf (_SC_OPEN_MAX);
	201	#else
	202	return 10000;
	203	#endif
f6fdbddf	204	}
	205
	206	static int
	207	fdlim_set(int lim)
	208	{
f318b98b	209	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	210	struct rlimit rlfd;
b03bd394	211	#endif
f6fdbddf	212	if (lim <= 0)
f6fdbddf	213	return (-1);
f318b98b	214	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	215	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	216	return (-1);
	217	rlfd.rlim_cur = lim;
	218	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	219	return (-1);
b03bd394	220	#elif defined (HAVE_SETDTABLESIZE)
b705bea0	221	setdtablesize(lim);
b03bd394	222	#endif
f6fdbddf	223	return (0);
	224	}
	225
	226	/*
	227	* This is an strsep function that returns a null field for adjacent
	228	* separators. This is the same as the 4.4BSD strsep, but different from the
	229	* one in the GNU libc.
	230	*/
778f6940	231	static __inline__ char *
f6fdbddf	232	xstrsep(char *str, const char delim)
	233	{
	234	char s, e;
	235
	236	if (!**str)
	237	return (NULL);
	238
	239	s = *str;
	240	e = s + strcspn(s, delim);
	241
	242	if (*e != '\0')
	243	*e++ = '\0';
	244	*str = e;
	245
	246	return (s);
	247	}
	248
	249	/*
	250	* Get the next non-null token (like GNU strsep). Strsep() will return a
	251	* null token for two adjacent separators, so we may have to loop.
	252	*/
	253	char *
	254	strnnsep(char *stringp, char delim)
	255	{
	256	char *tok;
	257
	258	do {
	259	tok = xstrsep(stringp, delim);
	260	} while (tok && *tok == '\0');
	261	return (tok);
	262	}
	263
	264	void
	265	keyprint(char host, char output_name, char *kd, int len)
	266	{
	267	static Key *rsa;
	268	static Buffer msg;
	269
	270	if (rsa == NULL) {
	271	buffer_init(&msg);
	272	rsa = key_new(KEY_RSA1);
	273	}
	274	buffer_append(&msg, kd, len);
	275	buffer_consume(&msg, 8 - (len & 7)); /* padding */
	276	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
	277	error("%s: invalid packet type", host);
	278	buffer_clear(&msg);
	279	return;
	280	}
	281	buffer_consume(&msg, 8); /* cookie */
	282
	283	/* server key */
	284	(void) buffer_get_int(&msg);
	285	buffer_get_bignum(&msg, rsa->rsa->e);
	286	buffer_get_bignum(&msg, rsa->rsa->n);
	287
	288	/* host key */
	289	(void) buffer_get_int(&msg);
	290	buffer_get_bignum(&msg, rsa->rsa->e);
	291	buffer_get_bignum(&msg, rsa->rsa->n);
	292	buffer_clear(&msg);
	293
	294	fprintf(stdout, "%s ", output_name ? output_name : host);
	295	key_write(rsa, stdout);
296	fputs("\n", stdout);
297	}
298
299	int
300	tcpconnect(char *host)
301	{
302	struct addrinfo hints, ai, aitop;
303	char strport[NI_MAXSERV];
304	int gaierr, s = -1;
305
b5c334cc	306	snprintf(strport, sizeof strport, "%d", SSH_DEFAULT_PORT);
f6fdbddf	307	memset(&hints, 0, sizeof(hints));
	308	hints.ai_family = family;
	309	hints.ai_socktype = SOCK_STREAM;
	310	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	311	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	312	for (ai = aitop; ai; ai = ai->ai_next) {
	313	s = socket(ai->ai_family, SOCK_STREAM, 0);
	314	if (s < 0) {
	315	error("socket: %s", strerror(errno));
	316	continue;
	317	}
eea39c02	318	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
f6fdbddf	319	fatal("F_SETFL: %s", strerror(errno));
	320	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	321	errno != EINPROGRESS)
	322	error("connect (`%s'): %s", host, strerror(errno));
	323	else
	324	break;
	325	close(s);
	326	s = -1;
	327	}
	328	freeaddrinfo(aitop);
	329	return s;
	330	}
	331
	332	int
	333	conalloc(char iname, char oname)
	334	{
	335	int s;
	336	char namebase, name, *namelist;
	337
	338	namebase = namelist = xstrdup(iname);
	339
	340	do {
	341	name = xstrsep(&namelist, ",");
	342	if (!name) {
b5c334cc	343	xfree(namebase);
f6fdbddf	344	return (-1);
	345	}
	346	} while ((s = tcpconnect(name)) < 0);
	347
	348	if (s >= maxfd)
227e8e86	349	fatal("conalloc: fdno %d too high", s);
f6fdbddf	350	if (fdcon[s].c_status)
227e8e86	351	fatal("conalloc: attempt to reuse fdno %d", s);
f6fdbddf	352
	353	fdcon[s].c_fd = s;
	354	fdcon[s].c_status = CS_CON;
	355	fdcon[s].c_namebase = namebase;
	356	fdcon[s].c_name = name;
	357	fdcon[s].c_namelist = namelist;
	358	fdcon[s].c_output_name = xstrdup(oname);
	359	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	360	fdcon[s].c_len = 4;
	361	fdcon[s].c_off = 0;
	362	gettimeofday(&fdcon[s].c_tv, NULL);
	363	fdcon[s].c_tv.tv_sec += timeout;
	364	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
ff7fee59	365	FD_SET(s, read_wait);
f6fdbddf	366	ncon++;
	367	return (s);
	368	}
	369
	370	void
	371	confree(int s)
	372	{
f6fdbddf	373	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
227e8e86	374	fatal("confree: attempt to free bad fdno %d", s);
2671b47f	375	close(s);
b5c334cc	376	xfree(fdcon[s].c_namebase);
b5c334cc	377	xfree(fdcon[s].c_output_name);
f6fdbddf	378	if (fdcon[s].c_status == CS_KEYS)
b5c334cc	379	xfree(fdcon[s].c_data);
f6fdbddf	380	fdcon[s].c_status = CS_UNUSED;
f6fdbddf	381	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
ff7fee59	382	FD_CLR(s, read_wait);
f6fdbddf	383	ncon--;
	384	}
	385
	386	void
	387	contouch(int s)
	388	{
	389	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	390	gettimeofday(&fdcon[s].c_tv, NULL);
	391	fdcon[s].c_tv.tv_sec += timeout;
	392	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	393	}
	394
	395	int
	396	conrecycle(int s)
	397	{
	398	int ret;
	399	con *c = &fdcon[s];
	400	char iname, oname;
	401
	402	iname = xstrdup(c->c_namelist);
b5c334cc	403	oname = xstrdup(c->c_output_name);
f6fdbddf	404	confree(s);
f6fdbddf	405	ret = conalloc(iname, oname);
b5c334cc	406	xfree(iname);
b5c334cc	407	xfree(oname);
f6fdbddf	408	return (ret);
	409	}
	410
	411	void
	412	congreet(int s)
	413	{
	414	char buf[80];
	415	int n;
	416	con *c = &fdcon[s];
	417
	418	n = read(s, buf, sizeof(buf));
	419	if (n < 0) {
	420	if (errno != ECONNREFUSED)
	421	error("read (%s): %s", c->c_name, strerror(errno));
	422	conrecycle(s);
	423	return;
	424	}
	425	if (buf[n - 1] != '\n') {
	426	error("%s: bad greeting", c->c_name);
	427	confree(s);
	428	return;
	429	}
	430	buf[n - 1] = '\0';
	431	fprintf(stderr, "# %s %s\n", c->c_name, buf);
	432	n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
2671b47f	433	if (atomicio(write, s, buf, n) != n) {
f6fdbddf	434	error("write (%s): %s", c->c_name, strerror(errno));
	435	confree(s);
	436	return;
	437	}
	438	c->c_status = CS_SIZE;
	439	contouch(s);
	440	}
	441
	442	void
	443	conread(int s)
	444	{
	445	int n;
	446	con *c = &fdcon[s];
	447
	448	if (c->c_status == CS_CON) {
	449	congreet(s);
	450	return;
	451	}
	452	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	453	if (n < 0) {
	454	error("read (%s): %s", c->c_name, strerror(errno));
	455	confree(s);
	456	return;
	457	}
	458	c->c_off += n;
	459
	460	if (c->c_off == c->c_len)
	461	switch (c->c_status) {
	462	case CS_SIZE:
	463	c->c_plen = htonl(c->c_plen);
	464	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	465	c->c_off = 0;
	466	c->c_data = xmalloc(c->c_len);
	467	c->c_status = CS_KEYS;
	468	break;
	469	case CS_KEYS:
	470	keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
	471	confree(s);
	472	return;
	473	break;
	474	default:
227e8e86	475	fatal("conread: invalid status %d", c->c_status);
f6fdbddf	476	break;
	477	}
	478
	479	contouch(s);
	480	}
	481
	482	void
	483	conloop(void)
	484	{
ff7fee59	485	fd_set r, e;
f6fdbddf	486	struct timeval seltime, now;
	487	int i;
	488	con *c;
	489
	490	gettimeofday(&now, NULL);
	491	c = tq.tqh_first;
	492
2671b47f	493	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
2671b47f	494	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
f6fdbddf	495	seltime = c->c_tv;
	496	seltime.tv_sec -= now.tv_sec;
	497	seltime.tv_usec -= now.tv_usec;
5be2ec5e	498	if (seltime.tv_usec < 0) {
f6fdbddf	499	seltime.tv_usec += 1000000;
	500	seltime.tv_sec--;
	501	}
	502	} else
	503	seltime.tv_sec = seltime.tv_usec = 0;
	504
ff7fee59	505	r = xmalloc(read_wait_size);
	506	memcpy(r, read_wait, read_wait_size);
	507	e = xmalloc(read_wait_size);
	508	memcpy(e, read_wait, read_wait_size);
	509
	510	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
fd193ca4	511	(errno == EAGAIN \|\| errno == EINTR))
	512	;
	513
2671b47f	514	for (i = 0; i < maxfd; i++) {
ff7fee59	515	if (FD_ISSET(i, e)) {
f6fdbddf	516	error("%s: exception!", fdcon[i].c_name);
f6fdbddf	517	confree(i);
ff7fee59	518	} else if (FD_ISSET(i, r))
f6fdbddf	519	conread(i);
2671b47f	520	}
ff7fee59	521	xfree(r);
ff7fee59	522	xfree(e);
f6fdbddf	523
f6fdbddf	524	c = tq.tqh_first;
2671b47f	525	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
2671b47f	526	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
f6fdbddf	527	int s = c->c_fd;
2671b47f	528
f6fdbddf	529	c = c->c_link.tqe_next;
	530	conrecycle(s);
	531	}
	532	}
	533
	534	char *
	535	nexthost(int argc, char **argv)
	536	{
	537	static Linebuf *lb;
	538
	539	for (;;) {
	540	if (!lb) {
	541	if (argno >= argc)
	542	return (NULL);
	543	if (argv[argno][0] != '-')
	544	return (argv[argno++]);
	545	if (!strcmp(argv[argno], "--")) {
	546	if (++argno >= argc)
	547	return (NULL);
	548	return (argv[argno++]);
	549	} else if (!strncmp(argv[argno], "-f", 2)) {
	550	char *fname;
2671b47f	551
f6fdbddf	552	if (argv[argno][2])
	553	fname = &argv[argno++][2];
	554	else if (++argno >= argc) {
	555	error("missing filename for `-f'");
	556	return (NULL);
	557	} else
	558	fname = argv[argno++];
	559	if (!strcmp(fname, "-"))
	560	fname = NULL;
f20255cb	561	lb = Linebuf_alloc(fname, error);
f6fdbddf	562	} else
2671b47f	563	error("ignoring invalid/misplaced option `%s'",
2671b47f	564	argv[argno++]);
f6fdbddf	565	} else {
f6fdbddf	566	char *line;
2671b47f	567
5be2ec5e	568	line = Linebuf_getline(lb);
f6fdbddf	569	if (line)
	570	return (line);
	571	Linebuf_free(lb);
	572	lb = NULL;
	573	}
	574	}
	575	}
	576
	577	static void
	578	usage(void)
	579	{
227e8e86	580	fatal("usage: %s [-t timeout] { [--] host \| -f file } ...", __progname);
f6fdbddf	581	return;
	582	}
	583
	584	int
	585	main(int argc, char **argv)
	586	{
	587	char *host = NULL;
	588
1fe6a48f	589	__progname = get_progname(argv[0]);
f6fdbddf	590	TAILQ_INIT(&tq);
f6fdbddf	591
f6fdbddf	592	if (argc <= argno)
	593	usage();
	594
	595	if (argv[1][0] == '-' && argv[1][1] == 't') {
	596	argno++;
	597	if (argv[1][2])
	598	timeout = atoi(&argv[1][2]);
	599	else {
	600	if (argno >= argc)
	601	usage();
	602	timeout = atoi(argv[argno++]);
	603	}
	604	if (timeout <= 0)
	605	usage();
	606	}
	607	if (argc <= argno)
	608	usage();
	609
	610	maxfd = fdlim_get(1);
	611	if (maxfd < 0)
227e8e86	612	fatal("%s: fdlim_get: bad value", __progname);
f6fdbddf	613	if (maxfd > MAXMAXFD)
f6fdbddf	614	maxfd = MAXMAXFD;
2671b47f	615	if (MAXCON <= 0)
227e8e86	616	fatal("%s: not enough file descriptors", __progname);
f6fdbddf	617	if (maxfd > fdlim_get(0))
	618	fdlim_set(maxfd);
	619	fdcon = xmalloc(maxfd * sizeof(con));
5be2ec5e	620	memset(fdcon, 0, maxfd * sizeof(con));
f6fdbddf	621
ff7fee59	622	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	623	read_wait = xmalloc(read_wait_size);
	624	memset(read_wait, 0, read_wait_size);
	625
f6fdbddf	626	do {
2671b47f	627	while (ncon < MAXCON) {
f6fdbddf	628	char *name;
	629
	630	host = nexthost(argc, argv);
	631	if (host == NULL)
	632	break;
	633	name = strnnsep(&host, " \t\n");
	634	conalloc(name, *host ? host : name);
	635	}
	636	conloop();
	637	} while (host);
	638	while (ncon > 0)
	639	conloop();
	640
	641	return (0);
	642	}