[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 1.6 2000/12/19 23:17:58 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 <openssl/rsa.h>
#include <openssl/dsa.h>

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

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

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

#define PORT 22
#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"))) {
			free(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);
		free(lb);
		return (NULL);
	}
	lb->errfun = errfun;
	lb->lineno = 0;
	return (lb);
}

static inline void
Linebuf_free(Linebuf * lb)
{
	fclose(lb->stream);
	free(lb->buf);
	free(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", 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_NDELAY) < 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) {
			free(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);
	free(fdcon[s].c_namebase);
	free(fdcon[s].c_output_name);
	if (fdcon[s].c_status == CS_KEYS)
		free(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 = c->c_output_name;
	c->c_output_name = NULL;/* prevent it from being freed */
	confree(s);
	ret = conalloc(iname, oname);
	free(iname);
	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"
1e3b8b07	11	RCSID("$OpenBSD: ssh-keyscan.c,v 1.6 2000/12/19 23:17:58 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>
	21	#include <openssl/rsa.h>
	22	#include <openssl/dsa.h>
	23
	24	#include "xmalloc.h"
	25	#include "ssh.h"
	26	#include "key.h"
	27	#include "buffer.h"
	28	#include "bufaux.h"
	29
	30	static int argno = 1; /* Number of argument currently being parsed */
	31
	32	int family = AF_UNSPEC; /* IPv4, IPv6 or both */
	33
	34	#define PORT 22
	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;
	41	#define maxcon (maxfd - 10)
	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
	93	static inline Linebuf *
	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"))) {
	106	free(lb);
	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);
	119	free(lb);
	120	return (NULL);
	121	}
	122	lb->errfun = errfun;
	123	lb->lineno = 0;
	124	return (lb);
	125	}
	126
	127	static inline void
	128	Linebuf_free(Linebuf * lb)
	129	{
	130	fclose(lb->stream);
	131	free(lb->buf);
	132	free(lb);
	133	}
	134
	135	static inline void
	136	Linebuf_restart(Linebuf * lb)
	137	{
	138	clearerr(lb->stream);
	139	rewind(lb->stream);
	140	lb->lineno = 0;
	141	}
	142
	143	static inline int
	144	Linebuf_lineno(Linebuf * lb)
	145	{
	146	return (lb->lineno);
	147	}
	148
	149	static inline char *
	150	getline(Linebuf * lb)
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)
159	(*lb->errfun) ("%s: %s\n", lb->filename, strerror(errno));
160	return (NULL);
161	}
162	n = strlen(lb->buf);
163
164	/* Return it or an error if it fits */
165	if (n > 0 && lb->buf[n - 1] == '\n') {
166	lb->buf[n - 1] = '\0';
167	return (lb->buf);
168	}
169	if (n != lb->size - 1) {
170	if (lb->errfun)
171	(*lb->errfun) ("%s: skipping incomplete last line\n", lb->filename);
172	return (NULL);
173	}
174	/* Double the buffer if we need more space */
175	if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
176	if (lb->errfun)
177	(*lb->errfun) ("linebuf (%s): realloc failed\n", lb->filename);
178	return (NULL);
179	}
180	}
181	}
182
183	static int
184	fdlim_get(int hard)
185	{
f318b98b	186	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	187	struct rlimit rlfd;
	188	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	189	return (-1);
	190	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
	191	return 10000;
	192	else
	193	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
b03bd394	194	#elif defined (HAVE_SYSCONF)
	195	return sysconf (_SC_OPEN_MAX);
	196	#else
	197	return 10000;
	198	#endif
f6fdbddf	199	}
	200
	201	static int
	202	fdlim_set(int lim)
	203	{
f318b98b	204	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	205	struct rlimit rlfd;
b03bd394	206	#endif
f6fdbddf	207	if (lim <= 0)
f6fdbddf	208	return (-1);
f318b98b	209	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
f6fdbddf	210	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	211	return (-1);
	212	rlfd.rlim_cur = lim;
	213	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	214	return (-1);
b03bd394	215	#elif defined (HAVE_SETDTABLESIZE)
	216	setdtablesize (lim);
	217	#endif
f6fdbddf	218	return (0);
	219	}
	220
	221	/*
	222	* This is an strsep function that returns a null field for adjacent
	223	* separators. This is the same as the 4.4BSD strsep, but different from the
	224	* one in the GNU libc.
	225	*/
	226	inline char *
	227	xstrsep(char *str, const char delim)
	228	{
	229	char s, e;
	230
	231	if (!**str)
	232	return (NULL);
	233
	234	s = *str;
	235	e = s + strcspn(s, delim);
	236
	237	if (*e != '\0')
	238	*e++ = '\0';
	239	*str = e;
	240
	241	return (s);
	242	}
	243
	244	/*
	245	* Get the next non-null token (like GNU strsep). Strsep() will return a
	246	* null token for two adjacent separators, so we may have to loop.
	247	*/
	248	char *
	249	strnnsep(char *stringp, char delim)
	250	{
	251	char *tok;
	252
	253	do {
	254	tok = xstrsep(stringp, delim);
	255	} while (tok && *tok == '\0');
	256	return (tok);
	257	}
	258
	259	void
	260	keyprint(char host, char output_name, char *kd, int len)
	261	{
	262	static Key *rsa;
	263	static Buffer msg;
	264
	265	if (rsa == NULL) {
	266	buffer_init(&msg);
	267	rsa = key_new(KEY_RSA1);
	268	}
	269	buffer_append(&msg, kd, len);
	270	buffer_consume(&msg, 8 - (len & 7)); /* padding */
	271	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
	272	error("%s: invalid packet type", host);
	273	buffer_clear(&msg);
	274	return;
	275	}
	276	buffer_consume(&msg, 8); /* cookie */
	277
	278	/* server key */
	279	(void) buffer_get_int(&msg);
	280	buffer_get_bignum(&msg, rsa->rsa->e);
	281	buffer_get_bignum(&msg, rsa->rsa->n);
282
283	/* host key */
284	(void) buffer_get_int(&msg);
285	buffer_get_bignum(&msg, rsa->rsa->e);
286	buffer_get_bignum(&msg, rsa->rsa->n);
287	buffer_clear(&msg);
288
289	fprintf(stdout, "%s ", output_name ? output_name : host);
290	key_write(rsa, stdout);
291	fputs("\n", stdout);
292	}
293
294	int
295	tcpconnect(char *host)
296	{
297	struct addrinfo hints, ai, aitop;
298	char strport[NI_MAXSERV];
299	int gaierr, s = -1;
300
301	snprintf(strport, sizeof strport, "%d", PORT);
302	memset(&hints, 0, sizeof(hints));
303	hints.ai_family = family;
304	hints.ai_socktype = SOCK_STREAM;
305	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
306	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
307	for (ai = aitop; ai; ai = ai->ai_next) {
308	s = socket(ai->ai_family, SOCK_STREAM, 0);
309	if (s < 0) {
310	error("socket: %s", strerror(errno));
311	continue;
312	}
313	if (fcntl(s, F_SETFL, O_NDELAY) < 0)
314	fatal("F_SETFL: %s", strerror(errno));
315	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
316	errno != EINPROGRESS)
317	error("connect (`%s'): %s", host, strerror(errno));
318	else
319	break;
320	close(s);
321	s = -1;
322	}
323	freeaddrinfo(aitop);
324	return s;
325	}
326
327	int
328	conalloc(char iname, char oname)
329	{
330	int s;
331	char namebase, name, *namelist;
332
333	namebase = namelist = xstrdup(iname);
334
335	do {
336	name = xstrsep(&namelist, ",");
337	if (!name) {
338	free(namebase);
339	return (-1);
340	}
341	} while ((s = tcpconnect(name)) < 0);
342
343	if (s >= maxfd)
227e8e86	344	fatal("conalloc: fdno %d too high", s);
f6fdbddf	345	if (fdcon[s].c_status)
227e8e86	346	fatal("conalloc: attempt to reuse fdno %d", s);
f6fdbddf	347
	348	fdcon[s].c_fd = s;
	349	fdcon[s].c_status = CS_CON;
	350	fdcon[s].c_namebase = namebase;
	351	fdcon[s].c_name = name;
	352	fdcon[s].c_namelist = namelist;
	353	fdcon[s].c_output_name = xstrdup(oname);
	354	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	355	fdcon[s].c_len = 4;
	356	fdcon[s].c_off = 0;
	357	gettimeofday(&fdcon[s].c_tv, NULL);
	358	fdcon[s].c_tv.tv_sec += timeout;
	359	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	360	FD_SET(s, &read_wait);
	361	ncon++;
	362	return (s);
	363	}
	364
	365	void
	366	confree(int s)
	367	{
	368	close(s);
	369	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
227e8e86	370	fatal("confree: attempt to free bad fdno %d", s);
f6fdbddf	371	free(fdcon[s].c_namebase);
	372	free(fdcon[s].c_output_name);
	373	if (fdcon[s].c_status == CS_KEYS)
	374	free(fdcon[s].c_data);
	375	fdcon[s].c_status = CS_UNUSED;
	376	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	377	FD_CLR(s, &read_wait);
	378	ncon--;
	379	}
	380
	381	void
	382	contouch(int s)
	383	{
	384	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	385	gettimeofday(&fdcon[s].c_tv, NULL);
	386	fdcon[s].c_tv.tv_sec += timeout;
	387	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	388	}
	389
	390	int
	391	conrecycle(int s)
	392	{
	393	int ret;
	394	con *c = &fdcon[s];
	395	char iname, oname;
	396
	397	iname = xstrdup(c->c_namelist);
	398	oname = c->c_output_name;
	399	c->c_output_name = NULL;/* prevent it from being freed */
	400	confree(s);
	401	ret = conalloc(iname, oname);
	402	free(iname);
	403	return (ret);
	404	}
	405
	406	void
	407	congreet(int s)
	408	{
	409	char buf[80];
	410	int n;
	411	con *c = &fdcon[s];
	412
	413	n = read(s, buf, sizeof(buf));
	414	if (n < 0) {
	415	if (errno != ECONNREFUSED)
	416	error("read (%s): %s", c->c_name, strerror(errno));
	417	conrecycle(s);
	418	return;
	419	}
	420	if (buf[n - 1] != '\n') {
	421	error("%s: bad greeting", c->c_name);
	422	confree(s);
	423	return;
	424	}
	425	buf[n - 1] = '\0';
	426	fprintf(stderr, "# %s %s\n", c->c_name, buf);
	427	n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
	428	if (write(s, buf, n) != n) {
	429	error("write (%s): %s", c->c_name, strerror(errno));
	430	confree(s);
	431	return;
	432	}
	433	c->c_status = CS_SIZE;
	434	contouch(s);
435	}
436
437	void
438	conread(int s)
439	{
440	int n;
441	con *c = &fdcon[s];
442
443	if (c->c_status == CS_CON) {
444	congreet(s);
445	return;
446	}
447	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
448	if (n < 0) {
449	error("read (%s): %s", c->c_name, strerror(errno));
450	confree(s);
451	return;
452	}
453	c->c_off += n;
454
455	if (c->c_off == c->c_len)
456	switch (c->c_status) {
457	case CS_SIZE:
458	c->c_plen = htonl(c->c_plen);
459	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
460	c->c_off = 0;
461	c->c_data = xmalloc(c->c_len);
462	c->c_status = CS_KEYS;
463	break;
464	case CS_KEYS:
465	keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
466	confree(s);
467	return;
468	break;
469	default:
227e8e86	470	fatal("conread: invalid status %d", c->c_status);
f6fdbddf	471	break;
	472	}
	473
	474	contouch(s);
	475	}
	476
	477	void
	478	conloop(void)
	479	{
	480	fd_set r, e;
	481	struct timeval seltime, now;
	482	int i;
	483	con *c;
	484
	485	gettimeofday(&now, NULL);
	486	c = tq.tqh_first;
	487
	488	if (c &&
	489	(c->c_tv.tv_sec > now.tv_sec \|\|
	490	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	491	seltime = c->c_tv;
	492	seltime.tv_sec -= now.tv_sec;
	493	seltime.tv_usec -= now.tv_usec;
	494	if ((int) seltime.tv_usec < 0) {
	495	seltime.tv_usec += 1000000;
	496	seltime.tv_sec--;
	497	}
	498	} else
	499	seltime.tv_sec = seltime.tv_usec = 0;
	500
	501	r = e = read_wait;
	502	select(maxfd, &r, NULL, &e, &seltime);
	503	for (i = 0; i < maxfd; i++)
	504	if (FD_ISSET(i, &e)) {
	505	error("%s: exception!", fdcon[i].c_name);
	506	confree(i);
	507	} else if (FD_ISSET(i, &r))
	508	conread(i);
	509
	510	c = tq.tqh_first;
	511	while (c &&
	512	(c->c_tv.tv_sec < now.tv_sec \|\|
	513	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	514	int s = c->c_fd;
	515	c = c->c_link.tqe_next;
	516	conrecycle(s);
	517	}
	518	}
	519
	520	char *
	521	nexthost(int argc, char **argv)
	522	{
	523	static Linebuf *lb;
	524
	525	for (;;) {
	526	if (!lb) {
	527	if (argno >= argc)
	528	return (NULL);
	529	if (argv[argno][0] != '-')
	530	return (argv[argno++]);
	531	if (!strcmp(argv[argno], "--")) {
	532	if (++argno >= argc)
	533	return (NULL);
	534	return (argv[argno++]);
535	} else if (!strncmp(argv[argno], "-f", 2)) {
536	char *fname;
537	if (argv[argno][2])
538	fname = &argv[argno++][2];
539	else if (++argno >= argc) {
540	error("missing filename for `-f'");
541	return (NULL);
542	} else
543	fname = argv[argno++];
544	if (!strcmp(fname, "-"))
545	fname = NULL;
f20255cb	546	lb = Linebuf_alloc(fname, error);
f6fdbddf	547	} else
	548	error("ignoring invalid/misplaced option `%s'", argv[argno++]);
	549	} else {
	550	char *line;
	551	line = getline(lb);
	552	if (line)
	553	return (line);
	554	Linebuf_free(lb);
	555	lb = NULL;
	556	}
	557	}
	558	}
	559
	560	static void
	561	usage(void)
	562	{
227e8e86	563	fatal("usage: %s [-t timeout] { [--] host \| -f file } ...", __progname);
f6fdbddf	564	return;
	565	}
	566
	567	int
	568	main(int argc, char **argv)
	569	{
	570	char *host = NULL;
	571
1fe6a48f	572	__progname = get_progname(argv[0]);
f6fdbddf	573	TAILQ_INIT(&tq);
f6fdbddf	574
f6fdbddf	575	if (argc <= argno)
	576	usage();
	577
	578	if (argv[1][0] == '-' && argv[1][1] == 't') {
	579	argno++;
	580	if (argv[1][2])
	581	timeout = atoi(&argv[1][2]);
	582	else {
	583	if (argno >= argc)
	584	usage();
	585	timeout = atoi(argv[argno++]);
	586	}
	587	if (timeout <= 0)
	588	usage();
	589	}
	590	if (argc <= argno)
	591	usage();
	592
	593	maxfd = fdlim_get(1);
	594	if (maxfd < 0)
227e8e86	595	fatal("%s: fdlim_get: bad value", __progname);
f6fdbddf	596	if (maxfd > MAXMAXFD)
	597	maxfd = MAXMAXFD;
	598	if (maxcon <= 0)
227e8e86	599	fatal("%s: not enough file descriptors", __progname);
f6fdbddf	600	if (maxfd > fdlim_get(0))
	601	fdlim_set(maxfd);
	602	fdcon = xmalloc(maxfd * sizeof(con));
	603
	604	do {
	605	while (ncon < maxcon) {
	606	char *name;
	607
	608	host = nexthost(argc, argv);
	609	if (host == NULL)
	610	break;
	611	name = strnnsep(&host, " \t\n");
	612	conalloc(name, *host ? host : name);
	613	}
	614	conloop();
	615	} while (host);
	616	while (ncon > 0)
	617	conloop();
	618
	619	return (0);
	620	}