[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 1.1 2000/12/04 19:24:02 markus Exp $");

#ifdef HAVE_SYS_QUEUE_H
#include <sys/queue.h>
#else
#include "bsd-queue.h"
#endif
#include <err.h>
#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)

char *prog;
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 {
	unsigned 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;
	unsigned 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)
{
	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;
}

static int
fdlim_set(int lim)
{
	struct rlimit rlfd;
	if (lim <= 0)
		return (-1);
	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
	rlfd.rlim_cur = lim;
	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
	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\n", s);
	if (fdcon[s].c_status)
		fatal("conalloc: attempt to reuse fdno %d\n", 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\n", 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\n", 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, warn);
			} 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 } ...\n", prog);
	return;
}

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

	TAILQ_INIT(&tq);

	if ((prog = strrchr(argv[0], '/')))
		prog++;
	else
		prog = argv[0];

	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\n", prog);
	if (maxfd > MAXMAXFD)
		maxfd = MAXMAXFD;
	if (maxcon <= 0)
		fatal("%s: not enough file descriptors\n", prog);
	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"
	11	RCSID("$OpenBSD: ssh-keyscan.c,v 1.1 2000/12/04 19:24:02 markus Exp $");
	12
bf5f69f7	13	#ifdef HAVE_SYS_QUEUE_H
f6fdbddf	14	#include <sys/queue.h>
bf5f69f7	15	#else
	16	#include "bsd-queue.h"
	17	#endif
f6fdbddf	18	#include <err.h>
	19	#include <errno.h>
	20
	21	#include <openssl/bn.h>
	22	#include <openssl/rsa.h>
	23	#include <openssl/dsa.h>
	24
	25	#include "xmalloc.h"
	26	#include "ssh.h"
	27	#include "key.h"
	28	#include "buffer.h"
	29	#include "bufaux.h"
	30
	31	static int argno = 1; /* Number of argument currently being parsed */
	32
	33	int family = AF_UNSPEC; /* IPv4, IPv6 or both */
	34
	35	#define PORT 22
	36	#define MAXMAXFD 256
	37
	38	/* The number of seconds after which to give up on a TCP connection */
	39	int timeout = 5;
	40
	41	int maxfd;
	42	#define maxcon (maxfd - 10)
	43
	44	char *prog;
	45	fd_set read_wait;
	46	int ncon;
	47
	48	/*
	49	* Keep a connection structure for each file descriptor. The state
	50	* associated with file descriptor n is held in fdcon[n].
	51	*/
	52	typedef struct Connection {
	53	unsigned char c_status; /* State of connection on this file desc. */
	54	#define CS_UNUSED 0 /* File descriptor unused */
	55	#define CS_CON 1 /* Waiting to connect/read greeting */
	56	#define CS_SIZE 2 /* Waiting to read initial packet size */
	57	#define CS_KEYS 3 /* Waiting to read public key packet */
	58	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	59	int c_plen; /* Packet length field for ssh packet */
	60	int c_len; /* Total bytes which must be read. */
	61	int c_off; /* Length of data read so far. */
	62	char c_namebase; / Address to free for c_name and c_namelist */
	63	char c_name; / Hostname of connection for errors */
	64	char c_namelist; / Pointer to other possible addresses */
	65	char c_output_name; / Hostname of connection for output */
	66	char c_data; / Data read from this fd */
	67	struct timeval c_tv; /* Time at which connection gets aborted */
	68	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	69	} con;
	70
	71	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	72	con *fdcon;
	73
	74	/*
	75	* This is just a wrapper around fgets() to make it usable.
	76	*/
	77
	78	/* Stress-test. Increase this later. */
	79	#define LINEBUF_SIZE 16
	80
	81	typedef struct {
82	char *buf;
83	unsigned int size;
84	int lineno;
85	const char *filename;
86	FILE *stream;
87	void (errfun) (const char ,...);
88	} Linebuf;
89
90	static inline Linebuf *
91	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
92	{
93	Linebuf *lb;
94
95	if (!(lb = malloc(sizeof(*lb)))) {
96	if (errfun)
97	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
98	return (NULL);
99	}
100	if (filename) {
101	lb->filename = filename;
102	if (!(lb->stream = fopen(filename, "r"))) {
103	free(lb);
104	if (errfun)
105	(*errfun) ("%s: %s\n", filename, strerror(errno));
106	return (NULL);
107	}
108	} else {
109	lb->filename = "(stdin)";
110	lb->stream = stdin;
111	}
112
113	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
114	if (errfun)
115	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
116	free(lb);
117	return (NULL);
118	}
119	lb->errfun = errfun;
120	lb->lineno = 0;
121	return (lb);
122	}
123
124	static inline void
125	Linebuf_free(Linebuf * lb)
126	{
127	fclose(lb->stream);
128	free(lb->buf);
129	free(lb);
130	}
131
132	static inline void
133	Linebuf_restart(Linebuf * lb)
134	{
135	clearerr(lb->stream);
136	rewind(lb->stream);
137	lb->lineno = 0;
138	}
139
140	static inline int
141	Linebuf_lineno(Linebuf * lb)
142	{
143	return (lb->lineno);
144	}
145
146	static inline char *
147	getline(Linebuf * lb)
148	{
149	int n = 0;
150
151	lb->lineno++;
152	for (;;) {
153	/* Read a line */
154	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
155	if (ferror(lb->stream) && lb->errfun)
156	(*lb->errfun) ("%s: %s\n", lb->filename, strerror(errno));
157	return (NULL);
158	}
159	n = strlen(lb->buf);
160
161	/* Return it or an error if it fits */
162	if (n > 0 && lb->buf[n - 1] == '\n') {
163	lb->buf[n - 1] = '\0';
164	return (lb->buf);
165	}
166	if (n != lb->size - 1) {
167	if (lb->errfun)
168	(*lb->errfun) ("%s: skipping incomplete last line\n", lb->filename);
169	return (NULL);
170	}
171	/* Double the buffer if we need more space */
172	if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
173	if (lb->errfun)
174	(*lb->errfun) ("linebuf (%s): realloc failed\n", lb->filename);
175	return (NULL);
176	}
177	}
178	}
179
180	static int
181	fdlim_get(int hard)
182	{
183	struct rlimit rlfd;
184	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
185	return (-1);
186	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
187	return 10000;
188	else
189	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
190	}
191
192	static int
193	fdlim_set(int lim)
194	{
195	struct rlimit rlfd;
196	if (lim <= 0)
197	return (-1);
198	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
199	return (-1);
200	rlfd.rlim_cur = lim;
201	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
202	return (-1);
203	return (0);
204	}
205
206	/*
207	* This is an strsep function that returns a null field for adjacent
208	* separators. This is the same as the 4.4BSD strsep, but different from the
209	* one in the GNU libc.
210	*/
211	inline char *
212	xstrsep(char *str, const char delim)
213	{
214	char s, e;
215
216	if (!**str)
217	return (NULL);
218
219	s = *str;
220	e = s + strcspn(s, delim);
221
222	if (*e != '\0')
223	*e++ = '\0';
224	*str = e;
225
226	return (s);
227	}
228
229	/*
230	* Get the next non-null token (like GNU strsep). Strsep() will return a
231	* null token for two adjacent separators, so we may have to loop.
232	*/
233	char *
234	strnnsep(char *stringp, char delim)
235	{
236	char *tok;
237
238	do {
239	tok = xstrsep(stringp, delim);
240	} while (tok && *tok == '\0');
241	return (tok);
242	}
243
244	void
245	keyprint(char host, char output_name, char *kd, int len)
246	{
247	static Key *rsa;
248	static Buffer msg;
249
250	if (rsa == NULL) {
251	buffer_init(&msg);
252	rsa = key_new(KEY_RSA1);
253	}
254	buffer_append(&msg, kd, len);
255	buffer_consume(&msg, 8 - (len & 7)); /* padding */
256	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
257	error("%s: invalid packet type", host);
258	buffer_clear(&msg);
259	return;
260	}
261	buffer_consume(&msg, 8); /* cookie */
262
263	/* server key */
264	(void) buffer_get_int(&msg);
265	buffer_get_bignum(&msg, rsa->rsa->e);
266	buffer_get_bignum(&msg, rsa->rsa->n);
267
268	/* host key */
269	(void) buffer_get_int(&msg);
270	buffer_get_bignum(&msg, rsa->rsa->e);
271	buffer_get_bignum(&msg, rsa->rsa->n);
272	buffer_clear(&msg);
273
274	fprintf(stdout, "%s ", output_name ? output_name : host);
275	key_write(rsa, stdout);
276	fputs("\n", stdout);
277	}
278
279	int
280	tcpconnect(char *host)
281	{
282	struct addrinfo hints, ai, aitop;
283	char strport[NI_MAXSERV];
284	int gaierr, s = -1;
285
286	snprintf(strport, sizeof strport, "%d", PORT);
287	memset(&hints, 0, sizeof(hints));
288	hints.ai_family = family;
289	hints.ai_socktype = SOCK_STREAM;
290	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
291	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
292	for (ai = aitop; ai; ai = ai->ai_next) {
293	s = socket(ai->ai_family, SOCK_STREAM, 0);
294	if (s < 0) {
295	error("socket: %s", strerror(errno));
296	continue;
297	}
298	if (fcntl(s, F_SETFL, O_NDELAY) < 0)
299	fatal("F_SETFL: %s", strerror(errno));
300	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
301	errno != EINPROGRESS)
302	error("connect (`%s'): %s", host, strerror(errno));
303	else
304	break;
305	close(s);
306	s = -1;
307	}
308	freeaddrinfo(aitop);
309	return s;
310	}
311
312	int
313	conalloc(char iname, char oname)
314	{
315	int s;
316	char namebase, name, *namelist;
317
318	namebase = namelist = xstrdup(iname);
319
320	do {
321	name = xstrsep(&namelist, ",");
322	if (!name) {
323	free(namebase);
324	return (-1);
325	}
326	} while ((s = tcpconnect(name)) < 0);
327
328	if (s >= maxfd)
329	fatal("conalloc: fdno %d too high\n", s);
330	if (fdcon[s].c_status)
331	fatal("conalloc: attempt to reuse fdno %d\n", s);
332
333	fdcon[s].c_fd = s;
334	fdcon[s].c_status = CS_CON;
335	fdcon[s].c_namebase = namebase;
336	fdcon[s].c_name = name;
337	fdcon[s].c_namelist = namelist;
338	fdcon[s].c_output_name = xstrdup(oname);
339	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
340	fdcon[s].c_len = 4;
341	fdcon[s].c_off = 0;
342	gettimeofday(&fdcon[s].c_tv, NULL);
343	fdcon[s].c_tv.tv_sec += timeout;
344	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
345	FD_SET(s, &read_wait);
346	ncon++;
347	return (s);
348	}
349
350	void
351	confree(int s)
352	{
353	close(s);
354	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
355	fatal("confree: attempt to free bad fdno %d\n", s);
356	free(fdcon[s].c_namebase);
357	free(fdcon[s].c_output_name);
358	if (fdcon[s].c_status == CS_KEYS)
359	free(fdcon[s].c_data);
360	fdcon[s].c_status = CS_UNUSED;
361	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
362	FD_CLR(s, &read_wait);
363	ncon--;
364	}
365
366	void
367	contouch(int s)
368	{
369	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
370	gettimeofday(&fdcon[s].c_tv, NULL);
371	fdcon[s].c_tv.tv_sec += timeout;
372	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
373	}
374
375	int
376	conrecycle(int s)
377	{
378	int ret;
379	con *c = &fdcon[s];
380	char iname, oname;
381
382	iname = xstrdup(c->c_namelist);
383	oname = c->c_output_name;
384	c->c_output_name = NULL;/* prevent it from being freed */
385	confree(s);
386	ret = conalloc(iname, oname);
387	free(iname);
388	return (ret);
389	}
390
391	void
392	congreet(int s)
393	{
394	char buf[80];
395	int n;
396	con *c = &fdcon[s];
397
398	n = read(s, buf, sizeof(buf));
399	if (n < 0) {
400	if (errno != ECONNREFUSED)
401	error("read (%s): %s", c->c_name, strerror(errno));
402	conrecycle(s);
403	return;
404	}
405	if (buf[n - 1] != '\n') {
406	error("%s: bad greeting", c->c_name);
407	confree(s);
408	return;
409	}
410	buf[n - 1] = '\0';
411	fprintf(stderr, "# %s %s\n", c->c_name, buf);
412	n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
413	if (write(s, buf, n) != n) {
414	error("write (%s): %s", c->c_name, strerror(errno));
415	confree(s);
416	return;
417	}
418	c->c_status = CS_SIZE;
419	contouch(s);
420	}
421
422	void
423	conread(int s)
424	{
425	int n;
426	con *c = &fdcon[s];
427
428	if (c->c_status == CS_CON) {
429	congreet(s);
430	return;
431	}
432	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
433	if (n < 0) {
434	error("read (%s): %s", c->c_name, strerror(errno));
435	confree(s);
436	return;
437	}
438	c->c_off += n;
439
440	if (c->c_off == c->c_len)
441	switch (c->c_status) {
442	case CS_SIZE:
443	c->c_plen = htonl(c->c_plen);
444	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
445	c->c_off = 0;
446	c->c_data = xmalloc(c->c_len);
447	c->c_status = CS_KEYS;
448	break;
449	case CS_KEYS:
450	keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
451	confree(s);
452	return;
453	break;
454	default:
455	fatal("conread: invalid status %d\n", c->c_status);
456	break;
457	}
458
459	contouch(s);
460	}
461
462	void
463	conloop(void)
464	{
465	fd_set r, e;
466	struct timeval seltime, now;
467	int i;
468	con *c;
469
470	gettimeofday(&now, NULL);
471	c = tq.tqh_first;
472
473	if (c &&
474	(c->c_tv.tv_sec > now.tv_sec \|\|
475	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
476	seltime = c->c_tv;
477	seltime.tv_sec -= now.tv_sec;
478	seltime.tv_usec -= now.tv_usec;
479	if ((int) seltime.tv_usec < 0) {
480	seltime.tv_usec += 1000000;
481	seltime.tv_sec--;
482	}
483	} else
484	seltime.tv_sec = seltime.tv_usec = 0;
485
486	r = e = read_wait;
487	select(maxfd, &r, NULL, &e, &seltime);
488	for (i = 0; i < maxfd; i++)
489	if (FD_ISSET(i, &e)) {
490	error("%s: exception!", fdcon[i].c_name);
491	confree(i);
492	} else if (FD_ISSET(i, &r))
493	conread(i);
494
495	c = tq.tqh_first;
496	while (c &&
497	(c->c_tv.tv_sec < now.tv_sec \|\|
498	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
499	int s = c->c_fd;
500	c = c->c_link.tqe_next;
501	conrecycle(s);
502	}
503	}
504
505	char *
506	nexthost(int argc, char **argv)
507	{
508	static Linebuf *lb;
509
510	for (;;) {
511	if (!lb) {
512	if (argno >= argc)
513	return (NULL);
514	if (argv[argno][0] != '-')
515	return (argv[argno++]);
516	if (!strcmp(argv[argno], "--")) {
517	if (++argno >= argc)
518	return (NULL);
519	return (argv[argno++]);
520	} else if (!strncmp(argv[argno], "-f", 2)) {
521	char *fname;
522	if (argv[argno][2])
523	fname = &argv[argno++][2];
524	else if (++argno >= argc) {
525	error("missing filename for `-f'");
526	return (NULL);
527	} else
528	fname = argv[argno++];
529	if (!strcmp(fname, "-"))
530	fname = NULL;
531	lb = Linebuf_alloc(fname, warn);
532	} else
533	error("ignoring invalid/misplaced option `%s'", argv[argno++]);
534	} else {
535	char *line;
536	line = getline(lb);
537	if (line)
538	return (line);
539	Linebuf_free(lb);
540	lb = NULL;
541	}
542	}
543	}
544
545	static void
546	usage(void)
547	{
548	fatal("usage: %s [-t timeout] { [--] host \| -f file } ...\n", prog);
549	return;
550	}
551
552	int
553	main(int argc, char **argv)
554	{
555	char *host = NULL;
556
557	TAILQ_INIT(&tq);
558
559	if ((prog = strrchr(argv[0], '/')))
560	prog++;
561	else
562	prog = argv[0];
563
564	if (argc <= argno)
565	usage();
566
567	if (argv[1][0] == '-' && argv[1][1] == 't') {
568	argno++;
569	if (argv[1][2])
570	timeout = atoi(&argv[1][2]);
571	else {
572	if (argno >= argc)
573	usage();
574	timeout = atoi(argv[argno++]);
575	}
576	if (timeout <= 0)
577	usage();
578	}
579	if (argc <= argno)
580	usage();
581
582	maxfd = fdlim_get(1);
583	if (maxfd < 0)
584	fatal("%s: fdlim_get: bad value\n", prog);
585	if (maxfd > MAXMAXFD)
586	maxfd = MAXMAXFD;
587	if (maxcon <= 0)
588	fatal("%s: not enough file descriptors\n", prog);
589	if (maxfd > fdlim_get(0))
590	fdlim_set(maxfd);
591	fdcon = xmalloc(maxfd * sizeof(con));
592
593	do {
594	while (ncon < maxcon) {
595	char *name;
596
597	host = nexthost(argc, argv);
598	if (host == NULL)
599	break;
600	name = strnnsep(&host, " \t\n");
601	conalloc(name, *host ? host : name);
602	}
603	conloop();
604	} while (host);
605	while (ncon > 0)
606	conloop();
607
608	return (0);
609	}