[openssh.git] / misc.c

/* $OpenBSD: misc.c,v 1.56 2006/07/10 12:46:51 dtucker Exp $ */
/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 * Copyright (c) 2005,2006 Damien Miller.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/tcp.h>

#include <fcntl.h>
#ifdef HAVE_PATHS_H
# include <paths.h>
#include <pwd.h>
#endif
#ifdef SSH_TUN_OPENBSD
#include <net/if.h>
#endif

#include "misc.h"
#include "log.h"
#include "xmalloc.h"
#include "ssh.h"

/* remove newline at end of string */
char *
chop(char *s)
{
	char *t = s;
	while (*t) {
		if (*t == '\n' || *t == '\r') {
			*t = '\0';
			return s;
		}
		t++;
	}
	return s;

}

/* set/unset filedescriptor to non-blocking */
int
set_nonblock(int fd)
{
	int val;

	val = fcntl(fd, F_GETFL, 0);
	if (val < 0) {
		error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
		return (-1);
	}
	if (val & O_NONBLOCK) {
		debug3("fd %d is O_NONBLOCK", fd);
		return (0);
	}
	debug2("fd %d setting O_NONBLOCK", fd);
	val |= O_NONBLOCK;
	if (fcntl(fd, F_SETFL, val) == -1) {
		debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
		    strerror(errno));
		return (-1);
	}
	return (0);
}

int
unset_nonblock(int fd)
{
	int val;

	val = fcntl(fd, F_GETFL, 0);
	if (val < 0) {
		error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
		return (-1);
	}
	if (!(val & O_NONBLOCK)) {
		debug3("fd %d is not O_NONBLOCK", fd);
		return (0);
	}
	debug("fd %d clearing O_NONBLOCK", fd);
	val &= ~O_NONBLOCK;
	if (fcntl(fd, F_SETFL, val) == -1) {
		debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
		    fd, strerror(errno));
		return (-1);
	}
	return (0);
}

/* disable nagle on socket */
void
set_nodelay(int fd)
{
	int opt;
	socklen_t optlen;

	optlen = sizeof opt;
	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
		debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
		return;
	}
	if (opt == 1) {
		debug2("fd %d is TCP_NODELAY", fd);
		return;
	}
	opt = 1;
	debug2("fd %d setting TCP_NODELAY", fd);
	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
		error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
}

/* Characters considered whitespace in strsep calls. */
#define WHITESPACE " \t\r\n"
#define QUOTE	"\""

/* return next token in configuration line */
char *
strdelim(char **s)
{
	char *old;
	int wspace = 0;

	if (*s == NULL)
		return NULL;

	old = *s;

	*s = strpbrk(*s, WHITESPACE QUOTE "=");
	if (*s == NULL)
		return (old);

	if (*s[0] == '\"') {
		memmove(*s, *s + 1, strlen(*s)); /* move nul too */
		/* Find matching quote */
		if ((*s = strpbrk(*s, QUOTE)) == NULL) {
			return (NULL);		/* no matching quote */
		} else {
			*s[0] = '\0';
			return (old);
		}
	}

	/* Allow only one '=' to be skipped */
	if (*s[0] == '=')
		wspace = 1;
	*s[0] = '\0';

	/* Skip any extra whitespace after first token */
	*s += strspn(*s + 1, WHITESPACE) + 1;
	if (*s[0] == '=' && !wspace)
		*s += strspn(*s + 1, WHITESPACE) + 1;

	return (old);
}

struct passwd *
pwcopy(struct passwd *pw)
{
	struct passwd *copy = xcalloc(1, sizeof(*copy));

	copy->pw_name = xstrdup(pw->pw_name);
	copy->pw_passwd = xstrdup(pw->pw_passwd);
	copy->pw_gecos = xstrdup(pw->pw_gecos);
	copy->pw_uid = pw->pw_uid;
	copy->pw_gid = pw->pw_gid;
#ifdef HAVE_PW_EXPIRE_IN_PASSWD
	copy->pw_expire = pw->pw_expire;
#endif
#ifdef HAVE_PW_CHANGE_IN_PASSWD
	copy->pw_change = pw->pw_change;
#endif
#ifdef HAVE_PW_CLASS_IN_PASSWD
	copy->pw_class = xstrdup(pw->pw_class);
#endif
	copy->pw_dir = xstrdup(pw->pw_dir);
	copy->pw_shell = xstrdup(pw->pw_shell);
	return copy;
}

/*
 * Convert ASCII string to TCP/IP port number.
 * Port must be >0 and <=65535.
 * Return 0 if invalid.
 */
int
a2port(const char *s)
{
	long port;
	char *endp;

	errno = 0;
	port = strtol(s, &endp, 0);
	if (s == endp || *endp != '\0' ||
	    (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
	    port <= 0 || port > 65535)
		return 0;

	return port;
}

int
a2tun(const char *s, int *remote)
{
	const char *errstr = NULL;
	char *sp, *ep;
	int tun;

	if (remote != NULL) {
		*remote = SSH_TUNID_ANY;
		sp = xstrdup(s);
		if ((ep = strchr(sp, ':')) == NULL) {
			xfree(sp);
			return (a2tun(s, NULL));
		}
		ep[0] = '\0'; ep++;
		*remote = a2tun(ep, NULL);
		tun = a2tun(sp, NULL);
		xfree(sp);
		return (*remote == SSH_TUNID_ERR ? *remote : tun);
	}

	if (strcasecmp(s, "any") == 0)
		return (SSH_TUNID_ANY);

	tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
	if (errstr != NULL)
		return (SSH_TUNID_ERR);

	return (tun);
}

#define SECONDS		1
#define MINUTES		(SECONDS * 60)
#define HOURS		(MINUTES * 60)
#define DAYS		(HOURS * 24)
#define WEEKS		(DAYS * 7)

/*
 * Convert a time string into seconds; format is
 * a sequence of:
 *      time[qualifier]
 *
 * Valid time qualifiers are:
 *      <none>  seconds
 *      s|S     seconds
 *      m|M     minutes
 *      h|H     hours
 *      d|D     days
 *      w|W     weeks
 *
 * Examples:
 *      90m     90 minutes
 *      1h30m   90 minutes
 *      2d      2 days
 *      1w      1 week
 *
 * Return -1 if time string is invalid.
 */
long
convtime(const char *s)
{
	long total, secs;
	const char *p;
	char *endp;

	errno = 0;
	total = 0;
	p = s;

	if (p == NULL || *p == '\0')
		return -1;

	while (*p) {
		secs = strtol(p, &endp, 10);
		if (p == endp ||
		    (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
		    secs < 0)
			return -1;

		switch (*endp++) {
		case '\0':
			endp--;
			break;
		case 's':
		case 'S':
			break;
		case 'm':
		case 'M':
			secs *= MINUTES;
			break;
		case 'h':
		case 'H':
			secs *= HOURS;
			break;
		case 'd':
		case 'D':
			secs *= DAYS;
			break;
		case 'w':
		case 'W':
			secs *= WEEKS;
			break;
		default:
			return -1;
		}
		total += secs;
		if (total < 0)
			return -1;
		p = endp;
	}

	return total;
}

/*
 * Returns a standardized host+port identifier string.
 * Caller must free returned string.
 */
char *
put_host_port(const char *host, u_short port)
{
	char *hoststr;

	if (port == 0 || port == SSH_DEFAULT_PORT)
		return(xstrdup(host));
	if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
		fatal("put_host_port: asprintf: %s", strerror(errno));
	debug3("put_host_port: %s", hoststr);
	return hoststr;
}

/*
 * Search for next delimiter between hostnames/addresses and ports.
 * Argument may be modified (for termination).
 * Returns *cp if parsing succeeds.
 * *cp is set to the start of the next delimiter, if one was found.
 * If this is the last field, *cp is set to NULL.
 */
char *
hpdelim(char **cp)
{
	char *s, *old;

	if (cp == NULL || *cp == NULL)
		return NULL;

	old = s = *cp;
	if (*s == '[') {
		if ((s = strchr(s, ']')) == NULL)
			return NULL;
		else
			s++;
	} else if ((s = strpbrk(s, ":/")) == NULL)
		s = *cp + strlen(*cp); /* skip to end (see first case below) */

	switch (*s) {
	case '\0':
		*cp = NULL;	/* no more fields*/
		break;

	case ':':
	case '/':
		*s = '\0';	/* terminate */
		*cp = s + 1;
		break;

	default:
		return NULL;
	}

	return old;
}

char *
cleanhostname(char *host)
{
	if (*host == '[' && host[strlen(host) - 1] == ']') {
		host[strlen(host) - 1] = '\0';
		return (host + 1);
	} else
		return host;
}

char *
colon(char *cp)
{
	int flag = 0;

	if (*cp == ':')		/* Leading colon is part of file name. */
		return (0);
	if (*cp == '[')
		flag = 1;

	for (; *cp; ++cp) {
		if (*cp == '@' && *(cp+1) == '[')
			flag = 1;
		if (*cp == ']' && *(cp+1) == ':' && flag)
			return (cp+1);
		if (*cp == ':' && !flag)
			return (cp);
		if (*cp == '/')
			return (0);
	}
	return (0);
}

/* function to assist building execv() arguments */
void
addargs(arglist *args, char *fmt, ...)
{
	va_list ap;
	char *cp;
	u_int nalloc;
	int r;

	va_start(ap, fmt);
	r = vasprintf(&cp, fmt, ap);
	va_end(ap);
	if (r == -1)
		fatal("addargs: argument too long");

	nalloc = args->nalloc;
	if (args->list == NULL) {
		nalloc = 32;
		args->num = 0;
	} else if (args->num+2 >= nalloc)
		nalloc *= 2;

	args->list = xrealloc(args->list, nalloc, sizeof(char *));
	args->nalloc = nalloc;
	args->list[args->num++] = cp;
	args->list[args->num] = NULL;
}

void
replacearg(arglist *args, u_int which, char *fmt, ...)
{
	va_list ap;
	char *cp;
	int r;

	va_start(ap, fmt);
	r = vasprintf(&cp, fmt, ap);
	va_end(ap);
	if (r == -1)
		fatal("replacearg: argument too long");

	if (which >= args->num)
		fatal("replacearg: tried to replace invalid arg %d >= %d",
		    which, args->num);
	xfree(args->list[which]);
	args->list[which] = cp;
}

void
freeargs(arglist *args)
{
	u_int i;

	if (args->list != NULL) {
		for (i = 0; i < args->num; i++)
			xfree(args->list[i]);
		xfree(args->list);
		args->nalloc = args->num = 0;
		args->list = NULL;
	}
}

/*
 * Expands tildes in the file name.  Returns data allocated by xmalloc.
 * Warning: this calls getpw*.
 */
char *
tilde_expand_filename(const char *filename, uid_t uid)
{
	const char *path;
	char user[128], ret[MAXPATHLEN];
	struct passwd *pw;
	u_int len, slash;

	if (*filename != '~')
		return (xstrdup(filename));
	filename++;

	path = strchr(filename, '/');
	if (path != NULL && path > filename) {		/* ~user/path */
		slash = path - filename;
		if (slash > sizeof(user) - 1)
			fatal("tilde_expand_filename: ~username too long");
		memcpy(user, filename, slash);
		user[slash] = '\0';
		if ((pw = getpwnam(user)) == NULL)
			fatal("tilde_expand_filename: No such user %s", user);
	} else if ((pw = getpwuid(uid)) == NULL)	/* ~/path */
		fatal("tilde_expand_filename: No such uid %d", uid);

	if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
		fatal("tilde_expand_filename: Path too long");

	/* Make sure directory has a trailing '/' */
	len = strlen(pw->pw_dir);
	if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
	    strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
		fatal("tilde_expand_filename: Path too long");

	/* Skip leading '/' from specified path */
	if (path != NULL)
		filename = path + 1;
	if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
		fatal("tilde_expand_filename: Path too long");

	return (xstrdup(ret));
}

/*
 * Expand a string with a set of %[char] escapes. A number of escapes may be
 * specified as (char *escape_chars, char *replacement) pairs. The list must
 * be terminated by a NULL escape_char. Returns replaced string in memory
 * allocated by xmalloc.
 */
char *
percent_expand(const char *string, ...)
{
#define EXPAND_MAX_KEYS	16
	struct {
		const char *key;
		const char *repl;
	} keys[EXPAND_MAX_KEYS];
	u_int num_keys, i, j;
	char buf[4096];
	va_list ap;

	/* Gather keys */
	va_start(ap, string);
	for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
		keys[num_keys].key = va_arg(ap, char *);
		if (keys[num_keys].key == NULL)
			break;
		keys[num_keys].repl = va_arg(ap, char *);
		if (keys[num_keys].repl == NULL)
			fatal("percent_expand: NULL replacement");
	}
	va_end(ap);

	if (num_keys >= EXPAND_MAX_KEYS)
		fatal("percent_expand: too many keys");

	/* Expand string */
	*buf = '\0';
	for (i = 0; *string != '\0'; string++) {
		if (*string != '%') {
 append:
			buf[i++] = *string;
			if (i >= sizeof(buf))
				fatal("percent_expand: string too long");
			buf[i] = '\0';
			continue;
		}
		string++;
		if (*string == '%')
			goto append;
		for (j = 0; j < num_keys; j++) {
			if (strchr(keys[j].key, *string) != NULL) {
				i = strlcat(buf, keys[j].repl, sizeof(buf));
				if (i >= sizeof(buf))
					fatal("percent_expand: string too long");
				break;
			}
		}
		if (j >= num_keys)
			fatal("percent_expand: unknown key %%%c", *string);
	}
	return (xstrdup(buf));
#undef EXPAND_MAX_KEYS
}

/*
 * Read an entire line from a public key file into a static buffer, discarding
 * lines that exceed the buffer size.  Returns 0 on success, -1 on failure.
 */
int
read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
   u_long *lineno)
{
	while (fgets(buf, bufsz, f) != NULL) {
		(*lineno)++;
		if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
			return 0;
		} else {
			debug("%s: %s line %lu exceeds size limit", __func__,
			    filename, *lineno);
			/* discard remainder of line */
			while (fgetc(f) != '\n' && !feof(f))
				;	/* nothing */
		}
	}
	return -1;
}

int
tun_open(int tun, int mode)
{
#if defined(CUSTOM_SYS_TUN_OPEN)
	return (sys_tun_open(tun, mode));
#elif defined(SSH_TUN_OPENBSD)
	struct ifreq ifr;
	char name[100];
	int fd = -1, sock;

	/* Open the tunnel device */
	if (tun <= SSH_TUNID_MAX) {
		snprintf(name, sizeof(name), "/dev/tun%d", tun);
		fd = open(name, O_RDWR);
	} else if (tun == SSH_TUNID_ANY) {
		for (tun = 100; tun >= 0; tun--) {
			snprintf(name, sizeof(name), "/dev/tun%d", tun);
			if ((fd = open(name, O_RDWR)) >= 0)
				break;
		}
	} else {
		debug("%s: invalid tunnel %u", __func__, tun);
		return (-1);
	}

	if (fd < 0) {
		debug("%s: %s open failed: %s", __func__, name, strerror(errno));
		return (-1);
	}

	debug("%s: %s mode %d fd %d", __func__, name, mode, fd);

	/* Set the tunnel device operation mode */
	snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
	if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
		goto failed;

	if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
		goto failed;

	/* Set interface mode */
	ifr.ifr_flags &= ~IFF_UP;
	if (mode == SSH_TUNMODE_ETHERNET)
		ifr.ifr_flags |= IFF_LINK0;
	else
		ifr.ifr_flags &= ~IFF_LINK0;
	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
		goto failed;

	/* Bring interface up */
	ifr.ifr_flags |= IFF_UP;
	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
		goto failed;

	close(sock);
	return (fd);

 failed:
	if (fd >= 0)
		close(fd);
	if (sock >= 0)
		close(sock);
	debug("%s: failed to set %s mode %d: %s", __func__, name,
	    mode, strerror(errno));
	return (-1);
#else
	error("Tunnel interfaces are not supported on this platform");
	return (-1);
#endif
}

void
sanitise_stdfd(void)
{
	int nullfd, dupfd;

	if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
		fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
		exit(1);
	}
	while (++dupfd <= 2) {
		/* Only clobber closed fds */
		if (fcntl(dupfd, F_GETFL, 0) >= 0)
			continue;
		if (dup2(nullfd, dupfd) == -1) {
			fprintf(stderr, "dup2: %s", strerror(errno));
			exit(1);
		}
	}
	if (nullfd > 2)
		close(nullfd);
}

char *
tohex(const void *vp, size_t l)
{
	const u_char *p = (const u_char *)vp;
	char b[3], *r;
	size_t i, hl;

	if (l > 65536)
		return xstrdup("tohex: length > 65536");

	hl = l * 2 + 1;
	r = xcalloc(1, hl);
	for (i = 0; i < l; i++) {
		snprintf(b, sizeof(b), "%02x", p[i]);
		strlcat(r, b, hl);
	}
	return (r);
}

u_int64_t
get_u64(const void *vp)
{
	const u_char *p = (const u_char *)vp;
	u_int64_t v;

	v  = (u_int64_t)p[0] << 56;
	v |= (u_int64_t)p[1] << 48;
	v |= (u_int64_t)p[2] << 40;
	v |= (u_int64_t)p[3] << 32;
	v |= (u_int64_t)p[4] << 24;
	v |= (u_int64_t)p[5] << 16;
	v |= (u_int64_t)p[6] << 8;
	v |= (u_int64_t)p[7];

	return (v);
}

u_int32_t
get_u32(const void *vp)
{
	const u_char *p = (const u_char *)vp;
	u_int32_t v;

	v  = (u_int32_t)p[0] << 24;
	v |= (u_int32_t)p[1] << 16;
	v |= (u_int32_t)p[2] << 8;
	v |= (u_int32_t)p[3];

	return (v);
}

u_int16_t
get_u16(const void *vp)
{
	const u_char *p = (const u_char *)vp;
	u_int16_t v;

	v  = (u_int16_t)p[0] << 8;
	v |= (u_int16_t)p[1];

	return (v);
}

void
put_u64(void *vp, u_int64_t v)
{
	u_char *p = (u_char *)vp;

	p[0] = (u_char)(v >> 56) & 0xff;
	p[1] = (u_char)(v >> 48) & 0xff;
	p[2] = (u_char)(v >> 40) & 0xff;
	p[3] = (u_char)(v >> 32) & 0xff;
	p[4] = (u_char)(v >> 24) & 0xff;
	p[5] = (u_char)(v >> 16) & 0xff;
	p[6] = (u_char)(v >> 8) & 0xff;
	p[7] = (u_char)v & 0xff;
}

void
put_u32(void *vp, u_int32_t v)
{
	u_char *p = (u_char *)vp;

	p[0] = (u_char)(v >> 24) & 0xff;
	p[1] = (u_char)(v >> 16) & 0xff;
	p[2] = (u_char)(v >> 8) & 0xff;
	p[3] = (u_char)v & 0xff;
}


void
put_u16(void *vp, u_int16_t v)
{
	u_char *p = (u_char *)vp;

	p[0] = (u_char)(v >> 8) & 0xff;
	p[1] = (u_char)v & 0xff;
}
Commit	Line	Data
d4530052	1	/* $OpenBSD: misc.c,v 1.56 2006/07/10 12:46:51 dtucker Exp $ */
bcbf86ec	2	/*
bcbf86ec	3	* Copyright (c) 2000 Markus Friedl. All rights reserved.
51e7a012	4	* Copyright (c) 2005,2006 Damien Miller. All rights reserved.
bcbf86ec	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
6d24277f	27	#include "includes.h"
bd7c69ea	28
bd7c69ea	29	#include <sys/ioctl.h>
b1842393	30	#include <sys/types.h>
9794d008	31	#include <sys/socket.h>
	32
	33	#include <netinet/in.h>
6425cf65	34	#include <netinet/tcp.h>
9794d008	35
d3221cca	36	#include <fcntl.h>
a75f5360	37	#ifdef HAVE_PATHS_H
6f61e0ec	38	# include <paths.h>
b1842393	39	#include <pwd.h>
a75f5360	40	#endif
1f1fbbd8	41	#ifdef SSH_TUN_OPENBSD
	42	#include <net/if.h>
	43	#endif
6d24277f	44
1aa00dcb	45	#include "misc.h"
42f11eb2	46	#include "log.h"
4ab21f86	47	#include "xmalloc.h"
d4530052	48	#include "ssh.h"
6d24277f	49
255cabd9	50	/* remove newline at end of string */
6d24277f	51	char *
	52	chop(char *s)
	53	{
	54	char *t = s;
	55	while (*t) {
6aacefa7	56	if (t == '\n' \|\| t == '\r') {
6d24277f	57	*t = '\0';
	58	return s;
	59	}
	60	t++;
	61	}
	62	return s;
	63
	64	}
	65
255cabd9	66	/* set/unset filedescriptor to non-blocking */
170694d7	67	int
6d24277f	68	set_nonblock(int fd)
	69	{
	70	int val;
89aa792b	71
6d24277f	72	val = fcntl(fd, F_GETFL, 0);
	73	if (val < 0) {
	74	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
170694d7	75	return (-1);
6d24277f	76	}
a22aff1f	77	if (val & O_NONBLOCK) {
170694d7	78	debug3("fd %d is O_NONBLOCK", fd);
170694d7	79	return (0);
a22aff1f	80	}
45c42d58	81	debug2("fd %d setting O_NONBLOCK", fd);
6d24277f	82	val \|= O_NONBLOCK;
170694d7	83	if (fcntl(fd, F_SETFL, val) == -1) {
	84	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
	85	strerror(errno));
	86	return (-1);
	87	}
	88	return (0);
6d24277f	89	}
6d24277f	90
170694d7	91	int
89aa792b	92	unset_nonblock(int fd)
	93	{
	94	int val;
	95
	96	val = fcntl(fd, F_GETFL, 0);
	97	if (val < 0) {
	98	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
170694d7	99	return (-1);
89aa792b	100	}
89aa792b	101	if (!(val & O_NONBLOCK)) {
170694d7	102	debug3("fd %d is not O_NONBLOCK", fd);
170694d7	103	return (0);
89aa792b	104	}
e04e7a19	105	debug("fd %d clearing O_NONBLOCK", fd);
89aa792b	106	val &= ~O_NONBLOCK;
170694d7	107	if (fcntl(fd, F_SETFL, val) == -1) {
170694d7	108	debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
c92ec40b	109	fd, strerror(errno));
170694d7	110	return (-1);
	111	}
	112	return (0);
89aa792b	113	}
89aa792b	114
bcc0381e	115	/* disable nagle on socket */
	116	void
	117	set_nodelay(int fd)
	118	{
3c05447a	119	int opt;
3c05447a	120	socklen_t optlen;
bcc0381e	121
811a6342	122	optlen = sizeof opt;
811a6342	123	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
f7fb35fe	124	debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
811a6342	125	return;
	126	}
	127	if (opt == 1) {
	128	debug2("fd %d is TCP_NODELAY", fd);
	129	return;
	130	}
	131	opt = 1;
6226a8f8	132	debug2("fd %d setting TCP_NODELAY", fd);
811a6342	133	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
bcc0381e	134	error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
	135	}
	136
6d24277f	137	/* Characters considered whitespace in strsep calls. */
6d24277f	138	#define WHITESPACE " \t\r\n"
533b9133	139	#define QUOTE "\""
6d24277f	140
255cabd9	141	/* return next token in configuration line */
6d24277f	142	char *
	143	strdelim(char **s)
	144	{
	145	char *old;
	146	int wspace = 0;
	147
	148	if (*s == NULL)
	149	return NULL;
	150
	151	old = *s;
	152
533b9133	153	s = strpbrk(s, WHITESPACE QUOTE "=");
6d24277f	154	if (*s == NULL)
	155	return (old);
	156
533b9133	157	if (*s[0] == '\"') {
	158	memmove(s, s + 1, strlen(s)); / move nul too */
	159	/* Find matching quote */
	160	if ((s = strpbrk(s, QUOTE)) == NULL) {
	161	return (NULL); /* no matching quote */
	162	} else {
	163	*s[0] = '\0';
	164	return (old);
	165	}
	166	}
	167
6d24277f	168	/* Allow only one '=' to be skipped */
	169	if (*s[0] == '=')
	170	wspace = 1;
	171	*s[0] = '\0';
	172
533b9133	173	/* Skip any extra whitespace after first token */
6d24277f	174	s += strspn(s + 1, WHITESPACE) + 1;
	175	if (*s[0] == '=' && !wspace)
	176	s += strspn(s + 1, WHITESPACE) + 1;
	177
	178	return (old);
	179	}
1aa00dcb	180
3b1a83df	181	struct passwd *
	182	pwcopy(struct passwd *pw)
	183	{
52e3daed	184	struct passwd copy = xcalloc(1, sizeof(copy));
5649fbbe	185
3b1a83df	186	copy->pw_name = xstrdup(pw->pw_name);
3b1a83df	187	copy->pw_passwd = xstrdup(pw->pw_passwd);
5649fbbe	188	copy->pw_gecos = xstrdup(pw->pw_gecos);
3b1a83df	189	copy->pw_uid = pw->pw_uid;
3b1a83df	190	copy->pw_gid = pw->pw_gid;
7751d4eb	191	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
c4d49b85	192	copy->pw_expire = pw->pw_expire;
7751d4eb	193	#endif
7751d4eb	194	#ifdef HAVE_PW_CHANGE_IN_PASSWD
c4d49b85	195	copy->pw_change = pw->pw_change;
7751d4eb	196	#endif
2605addd	197	#ifdef HAVE_PW_CLASS_IN_PASSWD
3b1a83df	198	copy->pw_class = xstrdup(pw->pw_class);
2605addd	199	#endif
3b1a83df	200	copy->pw_dir = xstrdup(pw->pw_dir);
	201	copy->pw_shell = xstrdup(pw->pw_shell);
	202	return copy;
	203	}
	204
255cabd9	205	/*
	206	* Convert ASCII string to TCP/IP port number.
	207	* Port must be >0 and <=65535.
	208	* Return 0 if invalid.
	209	*/
	210	int
	211	a2port(const char *s)
2d2a2c65	212	{
	213	long port;
	214	char *endp;
	215
	216	errno = 0;
	217	port = strtol(s, &endp, 0);
	218	if (s == endp \|\| *endp != '\0' \|\|
	219	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	220	port <= 0 \|\| port > 65535)
	221	return 0;
	222
	223	return port;
	224	}
	225
d20f3c9e	226	int
	227	a2tun(const char s, int remote)
	228	{
	229	const char *errstr = NULL;
	230	char sp, ep;
	231	int tun;
	232
	233	if (remote != NULL) {
a4f24bf8	234	*remote = SSH_TUNID_ANY;
d20f3c9e	235	sp = xstrdup(s);
	236	if ((ep = strchr(sp, ':')) == NULL) {
	237	xfree(sp);
	238	return (a2tun(s, NULL));
	239	}
	240	ep[0] = '\0'; ep++;
	241	*remote = a2tun(ep, NULL);
	242	tun = a2tun(sp, NULL);
	243	xfree(sp);
a4f24bf8	244	return (remote == SSH_TUNID_ERR ? remote : tun);
d20f3c9e	245	}
	246
	247	if (strcasecmp(s, "any") == 0)
a4f24bf8	248	return (SSH_TUNID_ANY);
d20f3c9e	249
a4f24bf8	250	tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
	251	if (errstr != NULL)
	252	return (SSH_TUNID_ERR);
d20f3c9e	253
	254	return (tun);
	255	}
	256
e2b1fb42	257	#define SECONDS 1
	258	#define MINUTES (SECONDS * 60)
	259	#define HOURS (MINUTES * 60)
	260	#define DAYS (HOURS * 24)
	261	#define WEEKS (DAYS * 7)
	262
255cabd9	263	/*
	264	* Convert a time string into seconds; format is
	265	* a sequence of:
	266	* time[qualifier]
	267	*
	268	* Valid time qualifiers are:
	269	* <none> seconds
	270	* s\|S seconds
	271	* m\|M minutes
	272	* h\|H hours
	273	* d\|D days
	274	* w\|W weeks
	275	*
	276	* Examples:
	277	* 90m 90 minutes
	278	* 1h30m 90 minutes
	279	* 2d 2 days
	280	* 1w 1 week
	281	*
	282	* Return -1 if time string is invalid.
	283	*/
	284	long
	285	convtime(const char *s)
e2b1fb42	286	{
	287	long total, secs;
	288	const char *p;
	289	char *endp;
	290
	291	errno = 0;
	292	total = 0;
	293	p = s;
	294
	295	if (p == NULL \|\| *p == '\0')
	296	return -1;
	297
	298	while (*p) {
	299	secs = strtol(p, &endp, 10);
	300	if (p == endp \|\|
	301	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
	302	secs < 0)
	303	return -1;
	304
	305	switch (*endp++) {
	306	case '\0':
	307	endp--;
5ef36928	308	break;
e2b1fb42	309	case 's':
	310	case 'S':
	311	break;
	312	case 'm':
	313	case 'M':
	314	secs *= MINUTES;
	315	break;
	316	case 'h':
	317	case 'H':
	318	secs *= HOURS;
	319	break;
	320	case 'd':
	321	case 'D':
	322	secs *= DAYS;
	323	break;
	324	case 'w':
	325	case 'W':
	326	secs *= WEEKS;
	327	break;
	328	default:
	329	return -1;
	330	}
	331	total += secs;
	332	if (total < 0)
	333	return -1;
	334	p = endp;
	335	}
	336
	337	return total;
	338	}
	339
d4530052	340	/*
	341	* Returns a standardized host+port identifier string.
	342	* Caller must free returned string.
	343	*/
	344	char *
	345	put_host_port(const char *host, u_short port)
	346	{
	347	char *hoststr;
	348
	349	if (port == 0 \|\| port == SSH_DEFAULT_PORT)
	350	return(xstrdup(host));
	351	if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
	352	fatal("put_host_port: asprintf: %s", strerror(errno));
	353	debug3("put_host_port: %s", hoststr);
	354	return hoststr;
	355	}
	356
3867aa0a	357	/*
	358	* Search for next delimiter between hostnames/addresses and ports.
	359	* Argument may be modified (for termination).
	360	* Returns *cp if parsing succeeds.
	361	* *cp is set to the start of the next delimiter, if one was found.
	362	* If this is the last field, *cp is set to NULL.
	363	*/
	364	char *
	365	hpdelim(char **cp)
	366	{
	367	char s, old;
	368
	369	if (cp == NULL \|\| *cp == NULL)
	370	return NULL;
	371
	372	old = s = *cp;
	373	if (*s == '[') {
	374	if ((s = strchr(s, ']')) == NULL)
	375	return NULL;
	376	else
	377	s++;
	378	} else if ((s = strpbrk(s, ":/")) == NULL)
	379	s = cp + strlen(cp); /* skip to end (see first case below) */
	380
	381	switch (*s) {
	382	case '\0':
	383	cp = NULL; / no more fields*/
	384	break;
f8cc7664	385
3867aa0a	386	case ':':
	387	case '/':
	388	s = '\0'; / terminate */
	389	*cp = s + 1;
	390	break;
f8cc7664	391
3867aa0a	392	default:
	393	return NULL;
	394	}
	395
	396	return old;
	397	}
	398
1fcde3fe	399	char *
	400	cleanhostname(char *host)
	401	{
	402	if (*host == '[' && host[strlen(host) - 1] == ']') {
	403	host[strlen(host) - 1] = '\0';
	404	return (host + 1);
	405	} else
	406	return host;
	407	}
	408
	409	char *
	410	colon(char *cp)
	411	{
	412	int flag = 0;
	413
	414	if (cp == ':') / Leading colon is part of file name. */
	415	return (0);
	416	if (*cp == '[')
	417	flag = 1;
	418
	419	for (; *cp; ++cp) {
	420	if (cp == '@' && (cp+1) == '[')
	421	flag = 1;
	422	if (cp == ']' && (cp+1) == ':' && flag)
	423	return (cp+1);
	424	if (*cp == ':' && !flag)
	425	return (cp);
	426	if (*cp == '/')
	427	return (0);
	428	}
	429	return (0);
	430	}
	431
255cabd9	432	/* function to assist building execv() arguments */
8a624ebf	433	void
	434	addargs(arglist args, char fmt, ...)
	435	{
	436	va_list ap;
4116f5c0	437	char *cp;
9a995072	438	u_int nalloc;
4116f5c0	439	int r;
8a624ebf	440
8a624ebf	441	va_start(ap, fmt);
4116f5c0	442	r = vasprintf(&cp, fmt, ap);
8a624ebf	443	va_end(ap);
4116f5c0	444	if (r == -1)
4116f5c0	445	fatal("addargs: argument too long");
8a624ebf	446
c46e584f	447	nalloc = args->nalloc;
8a624ebf	448	if (args->list == NULL) {
c46e584f	449	nalloc = 32;
8a624ebf	450	args->num = 0;
c46e584f	451	} else if (args->num+2 >= nalloc)
c46e584f	452	nalloc *= 2;
8a624ebf	453
c5d10563	454	args->list = xrealloc(args->list, nalloc, sizeof(char *));
c46e584f	455	args->nalloc = nalloc;
4116f5c0	456	args->list[args->num++] = cp;
8a624ebf	457	args->list[args->num] = NULL;
8a624ebf	458	}
ea067773	459
4116f5c0	460	void
	461	replacearg(arglist args, u_int which, char fmt, ...)
	462	{
	463	va_list ap;
	464	char *cp;
	465	int r;
	466
	467	va_start(ap, fmt);
	468	r = vasprintf(&cp, fmt, ap);
	469	va_end(ap);
	470	if (r == -1)
	471	fatal("replacearg: argument too long");
	472
	473	if (which >= args->num)
	474	fatal("replacearg: tried to replace invalid arg %d >= %d",
	475	which, args->num);
	476	xfree(args->list[which]);
	477	args->list[which] = cp;
	478	}
	479
	480	void
	481	freeargs(arglist *args)
	482	{
	483	u_int i;
	484
	485	if (args->list != NULL) {
	486	for (i = 0; i < args->num; i++)
	487	xfree(args->list[i]);
	488	xfree(args->list);
	489	args->nalloc = args->num = 0;
	490	args->list = NULL;
	491	}
	492	}
	493
49e71137	494	/*
	495	* Expands tildes in the file name. Returns data allocated by xmalloc.
	496	* Warning: this calls getpw*.
	497	*/
	498	char *
	499	tilde_expand_filename(const char *filename, uid_t uid)
	500	{
	501	const char *path;
	502	char user[128], ret[MAXPATHLEN];
	503	struct passwd *pw;
2ceb8101	504	u_int len, slash;
49e71137	505
	506	if (*filename != '~')
	507	return (xstrdup(filename));
	508	filename++;
	509
	510	path = strchr(filename, '/');
	511	if (path != NULL && path > filename) { /* ~user/path */
2ceb8101	512	slash = path - filename;
2ceb8101	513	if (slash > sizeof(user) - 1)
49e71137	514	fatal("tilde_expand_filename: ~username too long");
2ceb8101	515	memcpy(user, filename, slash);
2ceb8101	516	user[slash] = '\0';
49e71137	517	if ((pw = getpwnam(user)) == NULL)
	518	fatal("tilde_expand_filename: No such user %s", user);
	519	} else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
	520	fatal("tilde_expand_filename: No such uid %d", uid);
	521
	522	if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
	523	fatal("tilde_expand_filename: Path too long");
	524
	525	/* Make sure directory has a trailing '/' */
	526	len = strlen(pw->pw_dir);
	527	if ((len == 0 \|\| pw->pw_dir[len - 1] != '/') &&
	528	strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
	529	fatal("tilde_expand_filename: Path too long");
	530
	531	/* Skip leading '/' from specified path */
	532	if (path != NULL)
	533	filename = path + 1;
	534	if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
	535	fatal("tilde_expand_filename: Path too long");
	536
	537	return (xstrdup(ret));
	538	}
	539
a980cbd7	540	/*
	541	* Expand a string with a set of %[char] escapes. A number of escapes may be
	542	* specified as (char escape_chars, char replacement) pairs. The list must
6381acf0	543	* be terminated by a NULL escape_char. Returns replaced string in memory
a980cbd7	544	* allocated by xmalloc.
	545	*/
	546	char *
	547	percent_expand(const char *string, ...)
	548	{
	549	#define EXPAND_MAX_KEYS 16
	550	struct {
	551	const char *key;
	552	const char *repl;
	553	} keys[EXPAND_MAX_KEYS];
2ceb8101	554	u_int num_keys, i, j;
a980cbd7	555	char buf[4096];
	556	va_list ap;
	557
	558	/* Gather keys */
	559	va_start(ap, string);
	560	for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
	561	keys[num_keys].key = va_arg(ap, char *);
	562	if (keys[num_keys].key == NULL)
	563	break;
	564	keys[num_keys].repl = va_arg(ap, char *);
	565	if (keys[num_keys].repl == NULL)
	566	fatal("percent_expand: NULL replacement");
	567	}
	568	va_end(ap);
	569
	570	if (num_keys >= EXPAND_MAX_KEYS)
	571	fatal("percent_expand: too many keys");
	572
	573	/* Expand string */
	574	*buf = '\0';
	575	for (i = 0; *string != '\0'; string++) {
	576	if (*string != '%') {
	577	append:
	578	buf[i++] = *string;
	579	if (i >= sizeof(buf))
	580	fatal("percent_expand: string too long");
	581	buf[i] = '\0';
	582	continue;
	583	}
	584	string++;
	585	if (*string == '%')
	586	goto append;
	587	for (j = 0; j < num_keys; j++) {
	588	if (strchr(keys[j].key, *string) != NULL) {
	589	i = strlcat(buf, keys[j].repl, sizeof(buf));
	590	if (i >= sizeof(buf))
	591	fatal("percent_expand: string too long");
	592	break;
	593	}
	594	}
	595	if (j >= num_keys)
	596	fatal("percent_expand: unknown key %%%c", *string);
	597	}
	598	return (xstrdup(buf));
	599	#undef EXPAND_MAX_KEYS
	600	}
	601
ea067773	602	/*
	603	* Read an entire line from a public key file into a static buffer, discarding
	604	* lines that exceed the buffer size. Returns 0 on success, -1 on failure.
	605	*/
	606	int
	607	read_keyfile_line(FILE f, const char filename, char *buf, size_t bufsz,
41feb690	608	u_long *lineno)
ea067773	609	{
	610	while (fgets(buf, bufsz, f) != NULL) {
	611	(*lineno)++;
	612	if (buf[strlen(buf) - 1] == '\n' \|\| feof(f)) {
	613	return 0;
	614	} else {
41feb690	615	debug("%s: %s line %lu exceeds size limit", __func__,
41feb690	616	filename, *lineno);
ea067773	617	/* discard remainder of line */
f8cc7664	618	while (fgetc(f) != '\n' && !feof(f))
ea067773	619	; /* nothing */
	620	}
	621	}
	622	return -1;
	623	}
ef07103c	624
d20f3c9e	625	int
a4f24bf8	626	tun_open(int tun, int mode)
d20f3c9e	627	{
6306853a	628	#if defined(CUSTOM_SYS_TUN_OPEN)
6306853a	629	return (sys_tun_open(tun, mode));
0f6cb079	630	#elif defined(SSH_TUN_OPENBSD)
a4f24bf8	631	struct ifreq ifr;
d20f3c9e	632	char name[100];
a4f24bf8	633	int fd = -1, sock;
d20f3c9e	634
a4f24bf8	635	/* Open the tunnel device */
a4f24bf8	636	if (tun <= SSH_TUNID_MAX) {
d20f3c9e	637	snprintf(name, sizeof(name), "/dev/tun%d", tun);
a4f24bf8	638	fd = open(name, O_RDWR);
	639	} else if (tun == SSH_TUNID_ANY) {
	640	for (tun = 100; tun >= 0; tun--) {
	641	snprintf(name, sizeof(name), "/dev/tun%d", tun);
	642	if ((fd = open(name, O_RDWR)) >= 0)
	643	break;
d20f3c9e	644	}
d20f3c9e	645	} else {
81c042a3	646	debug("%s: invalid tunnel %u", __func__, tun);
a4f24bf8	647	return (-1);
	648	}
	649
	650	if (fd < 0) {
	651	debug("%s: %s open failed: %s", __func__, name, strerror(errno));
	652	return (-1);
	653	}
	654
	655	debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
	656
	657	/* Set the tunnel device operation mode */
	658	snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
	659	if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
	660	goto failed;
	661
	662	if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
	663	goto failed;
b1b65311	664
	665	/* Set interface mode */
	666	ifr.ifr_flags &= ~IFF_UP;
	667	if (mode == SSH_TUNMODE_ETHERNET)
a4f24bf8	668	ifr.ifr_flags \|= IFF_LINK0;
b1b65311	669	else
	670	ifr.ifr_flags &= ~IFF_LINK0;
	671	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
	672	goto failed;
	673
	674	/* Bring interface up */
a4f24bf8	675	ifr.ifr_flags \|= IFF_UP;
	676	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
	677	goto failed;
	678
	679	close(sock);
	680	return (fd);
	681
	682	failed:
	683	if (fd >= 0)
	684	close(fd);
	685	if (sock >= 0)
	686	close(sock);
	687	debug("%s: failed to set %s mode %d: %s", __func__, name,
	688	mode, strerror(errno));
d20f3c9e	689	return (-1);
6306853a	690	#else
	691	error("Tunnel interfaces are not supported on this platform");
	692	return (-1);
	693	#endif
d20f3c9e	694	}
d20f3c9e	695
fd6168c1	696	void
	697	sanitise_stdfd(void)
	698	{
db382686	699	int nullfd, dupfd;
fd6168c1	700
db382686	701	if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
fd6168c1	702	fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
	703	exit(1);
	704	}
db382686	705	while (++dupfd <= 2) {
	706	/* Only clobber closed fds */
	707	if (fcntl(dupfd, F_GETFL, 0) >= 0)
	708	continue;
	709	if (dup2(nullfd, dupfd) == -1) {
fd6168c1	710	fprintf(stderr, "dup2: %s", strerror(errno));
	711	exit(1);
	712	}
fd6168c1	713	}
	714	if (nullfd > 2)
	715	close(nullfd);
	716	}
	717
ef07103c	718	char *
51e7a012	719	tohex(const void *vp, size_t l)
ef07103c	720	{
51e7a012	721	const u_char p = (const u_char )vp;
ef07103c	722	char b[3], *r;
51e7a012	723	size_t i, hl;
	724
	725	if (l > 65536)
	726	return xstrdup("tohex: length > 65536");
ef07103c	727
ef07103c	728	hl = l * 2 + 1;
52e3daed	729	r = xcalloc(1, hl);
ef07103c	730	for (i = 0; i < l; i++) {
51e7a012	731	snprintf(b, sizeof(b), "%02x", p[i]);
ef07103c	732	strlcat(r, b, hl);
	733	}
	734	return (r);
	735	}
	736
51e7a012	737	u_int64_t
	738	get_u64(const void *vp)
	739	{
	740	const u_char p = (const u_char )vp;
	741	u_int64_t v;
	742
	743	v = (u_int64_t)p[0] << 56;
	744	v \|= (u_int64_t)p[1] << 48;
	745	v \|= (u_int64_t)p[2] << 40;
	746	v \|= (u_int64_t)p[3] << 32;
	747	v \|= (u_int64_t)p[4] << 24;
	748	v \|= (u_int64_t)p[5] << 16;
	749	v \|= (u_int64_t)p[6] << 8;
	750	v \|= (u_int64_t)p[7];
	751
	752	return (v);
	753	}
	754
	755	u_int32_t
	756	get_u32(const void *vp)
	757	{
	758	const u_char p = (const u_char )vp;
	759	u_int32_t v;
	760
	761	v = (u_int32_t)p[0] << 24;
	762	v \|= (u_int32_t)p[1] << 16;
	763	v \|= (u_int32_t)p[2] << 8;
	764	v \|= (u_int32_t)p[3];
	765
	766	return (v);
	767	}
	768
	769	u_int16_t
	770	get_u16(const void *vp)
	771	{
	772	const u_char p = (const u_char )vp;
	773	u_int16_t v;
	774
	775	v = (u_int16_t)p[0] << 8;
	776	v \|= (u_int16_t)p[1];
	777
	778	return (v);
	779	}
	780
	781	void
	782	put_u64(void *vp, u_int64_t v)
	783	{
	784	u_char p = (u_char )vp;
	785
	786	p[0] = (u_char)(v >> 56) & 0xff;
	787	p[1] = (u_char)(v >> 48) & 0xff;
	788	p[2] = (u_char)(v >> 40) & 0xff;
	789	p[3] = (u_char)(v >> 32) & 0xff;
	790	p[4] = (u_char)(v >> 24) & 0xff;
	791	p[5] = (u_char)(v >> 16) & 0xff;
	792	p[6] = (u_char)(v >> 8) & 0xff;
	793	p[7] = (u_char)v & 0xff;
	794	}
	795
	796	void
	797	put_u32(void *vp, u_int32_t v)
	798	{
	799	u_char p = (u_char )vp;
	800
801	p[0] = (u_char)(v >> 24) & 0xff;
802	p[1] = (u_char)(v >> 16) & 0xff;
803	p[2] = (u_char)(v >> 8) & 0xff;
804	p[3] = (u_char)v & 0xff;
805	}
806
807
808	void
809	put_u16(void *vp, u_int16_t v)
810	{
811	u_char p = (u_char )vp;
812
813	p[0] = (u_char)(v >> 8) & 0xff;
814	p[1] = (u_char)v & 0xff;
815	}