[gssapi-openssh.git] / openssh / misc.c

/* $OpenBSD: misc.c,v 1.64 2006/08/03 03:34:42 deraadt 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/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/param.h>

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

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

#include <errno.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 "xmalloc.h"
#include "misc.h"
#include "log.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	"\""

/* Characters considered as quotations. */
#define QUOTES "'\""

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

	if (*s == NULL)
		return NULL;

	old = *s;

        if ((q=strchr(QUOTES, (int) *old)) && *q)
        {
            /* find next quote character, point old to start of quoted
             * string */
            for (p = ++old;*p && *p!=*q; p++)
                 ;
            
            /* find start of next token */
            *s = (*p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL;
            
            /* terminate 'old' token */
            *p = '\0';
            return (old);
        }

	*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
30460aeb	1	/* $OpenBSD: misc.c,v 1.64 2006/08/03 03:34:42 deraadt Exp $ */
3c0ef626	2	/*
3c0ef626	3	* Copyright (c) 2000 Markus Friedl. All rights reserved.
30460aeb	4	* Copyright (c) 2005,2006 Damien Miller. All rights reserved.
3c0ef626	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
	27	#include "includes.h"
08822d99	28
30460aeb	29	#include <sys/types.h>
	30	#include <sys/ioctl.h>
	31	#include <sys/socket.h>
	32	#include <sys/param.h>
	33
	34	#include <stdarg.h>
	35	#include <stdio.h>
	36	#include <stdlib.h>
	37	#include <string.h>
	38	#include <unistd.h>
	39
	40	#include <netinet/in.h>
	41	#include <netinet/tcp.h>
	42
	43	#include <errno.h>
	44	#include <fcntl.h>
	45	#ifdef HAVE_PATHS_H
	46	# include <paths.h>
	47	#include <pwd.h>
	48	#endif
08822d99	49	#ifdef SSH_TUN_OPENBSD
	50	#include <net/if.h>
	51	#endif
3c0ef626	52
30460aeb	53	#include "xmalloc.h"
3c0ef626	54	#include "misc.h"
3c0ef626	55	#include "log.h"
30460aeb	56	#include "ssh.h"
3c0ef626	57
	58	/* remove newline at end of string */
	59	char *
	60	chop(char *s)
	61	{
	62	char *t = s;
	63	while (*t) {
75be3237	64	if (t == '\n' \|\| t == '\r') {
3c0ef626	65	*t = '\0';
	66	return s;
	67	}
	68	t++;
	69	}
	70	return s;
	71
	72	}
	73
	74	/* set/unset filedescriptor to non-blocking */
7e82606e	75	int
3c0ef626	76	set_nonblock(int fd)
	77	{
	78	int val;
	79
	80	val = fcntl(fd, F_GETFL, 0);
	81	if (val < 0) {
	82	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
7e82606e	83	return (-1);
3c0ef626	84	}
3c0ef626	85	if (val & O_NONBLOCK) {
7e82606e	86	debug3("fd %d is O_NONBLOCK", fd);
7e82606e	87	return (0);
3c0ef626	88	}
7cac2b65	89	debug2("fd %d setting O_NONBLOCK", fd);
3c0ef626	90	val \|= O_NONBLOCK;
7e82606e	91	if (fcntl(fd, F_SETFL, val) == -1) {
	92	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
	93	strerror(errno));
	94	return (-1);
	95	}
	96	return (0);
3c0ef626	97	}
3c0ef626	98
7e82606e	99	int
3c0ef626	100	unset_nonblock(int fd)
	101	{
	102	int val;
	103
	104	val = fcntl(fd, F_GETFL, 0);
	105	if (val < 0) {
	106	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
7e82606e	107	return (-1);
3c0ef626	108	}
3c0ef626	109	if (!(val & O_NONBLOCK)) {
7e82606e	110	debug3("fd %d is not O_NONBLOCK", fd);
7e82606e	111	return (0);
3c0ef626	112	}
	113	debug("fd %d clearing O_NONBLOCK", fd);
	114	val &= ~O_NONBLOCK;
7e82606e	115	if (fcntl(fd, F_SETFL, val) == -1) {
7e82606e	116	debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
75be3237	117	fd, strerror(errno));
7e82606e	118	return (-1);
	119	}
	120	return (0);
75be3237	121	}
	122
	123	/* disable nagle on socket */
	124	void
	125	set_nodelay(int fd)
	126	{
	127	int opt;
	128	socklen_t optlen;
	129
	130	optlen = sizeof opt;
	131	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
540d72c3	132	debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
75be3237	133	return;
	134	}
	135	if (opt == 1) {
	136	debug2("fd %d is TCP_NODELAY", fd);
	137	return;
	138	}
	139	opt = 1;
	140	debug2("fd %d setting TCP_NODELAY", fd);
	141	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
	142	error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
3c0ef626	143	}
	144
	145	/* Characters considered whitespace in strsep calls. */
	146	#define WHITESPACE " \t\r\n"
30460aeb	147	#define QUOTE "\""
3c0ef626	148
75be3237	149	/* Characters considered as quotations. */
	150	#define QUOTES "'\""
	151
3c0ef626	152	/* return next token in configuration line */
	153	char *
	154	strdelim(char **s)
	155	{
75be3237	156	char old, p, *q;
3c0ef626	157	int wspace = 0;
	158
	159	if (*s == NULL)
	160	return NULL;
	161
	162	old = *s;
	163
75be3237	164	if ((q=strchr(QUOTES, (int) old)) && q)
	165	{
	166	/* find next quote character, point old to start of quoted
	167	* string */
	168	for (p = ++old;p && p!=*q; p++)
	169	;
	170
	171	/* find start of next token */
	172	s = (p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL;
	173
	174	/* terminate 'old' token */
	175	*p = '\0';
	176	return (old);
	177	}
	178
30460aeb	179	s = strpbrk(s, WHITESPACE QUOTE "=");
3c0ef626	180	if (*s == NULL)
	181	return (old);
	182
30460aeb	183	if (*s[0] == '\"') {
	184	memmove(s, s + 1, strlen(s)); / move nul too */
	185	/* Find matching quote */
	186	if ((s = strpbrk(s, QUOTE)) == NULL) {
	187	return (NULL); /* no matching quote */
	188	} else {
	189	*s[0] = '\0';
	190	return (old);
	191	}
	192	}
	193
3c0ef626	194	/* Allow only one '=' to be skipped */
	195	if (*s[0] == '=')
	196	wspace = 1;
	197	*s[0] = '\0';
	198
30460aeb	199	/* Skip any extra whitespace after first token */
3c0ef626	200	s += strspn(s + 1, WHITESPACE) + 1;
	201	if (*s[0] == '=' && !wspace)
	202	s += strspn(s + 1, WHITESPACE) + 1;
	203
	204	return (old);
	205	}
	206
	207	struct passwd *
	208	pwcopy(struct passwd *pw)
	209	{
30460aeb	210	struct passwd copy = xcalloc(1, sizeof(copy));
3c0ef626	211
3c0ef626	212	copy->pw_name = xstrdup(pw->pw_name);
	213	copy->pw_passwd = xstrdup(pw->pw_passwd);
	214	copy->pw_gecos = xstrdup(pw->pw_gecos);
	215	copy->pw_uid = pw->pw_uid;
	216	copy->pw_gid = pw->pw_gid;
	217	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
	218	copy->pw_expire = pw->pw_expire;
	219	#endif
	220	#ifdef HAVE_PW_CHANGE_IN_PASSWD
	221	copy->pw_change = pw->pw_change;
	222	#endif
	223	#ifdef HAVE_PW_CLASS_IN_PASSWD
	224	copy->pw_class = xstrdup(pw->pw_class);
	225	#endif
	226	copy->pw_dir = xstrdup(pw->pw_dir);
	227	copy->pw_shell = xstrdup(pw->pw_shell);
	228	return copy;
	229	}
	230
	231	/*
	232	* Convert ASCII string to TCP/IP port number.
	233	* Port must be >0 and <=65535.
	234	* Return 0 if invalid.
	235	*/
	236	int
	237	a2port(const char *s)
	238	{
	239	long port;
	240	char *endp;
	241
	242	errno = 0;
	243	port = strtol(s, &endp, 0);
	244	if (s == endp \|\| *endp != '\0' \|\|
	245	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	246	port <= 0 \|\| port > 65535)
	247	return 0;
	248
	249	return port;
	250	}
	251
08822d99	252	int
	253	a2tun(const char s, int remote)
	254	{
	255	const char *errstr = NULL;
	256	char sp, ep;
	257	int tun;
	258
	259	if (remote != NULL) {
	260	*remote = SSH_TUNID_ANY;
	261	sp = xstrdup(s);
	262	if ((ep = strchr(sp, ':')) == NULL) {
	263	xfree(sp);
	264	return (a2tun(s, NULL));
	265	}
	266	ep[0] = '\0'; ep++;
	267	*remote = a2tun(ep, NULL);
	268	tun = a2tun(sp, NULL);
	269	xfree(sp);
	270	return (remote == SSH_TUNID_ERR ? remote : tun);
	271	}
	272
	273	if (strcasecmp(s, "any") == 0)
	274	return (SSH_TUNID_ANY);
	275
	276	tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
	277	if (errstr != NULL)
	278	return (SSH_TUNID_ERR);
	279
	280	return (tun);
	281	}
	282
3c0ef626	283	#define SECONDS 1
	284	#define MINUTES (SECONDS * 60)
	285	#define HOURS (MINUTES * 60)
	286	#define DAYS (HOURS * 24)
	287	#define WEEKS (DAYS * 7)
	288
	289	/*
	290	* Convert a time string into seconds; format is
	291	* a sequence of:
	292	* time[qualifier]
	293	*
	294	* Valid time qualifiers are:
	295	* <none> seconds
	296	* s\|S seconds
	297	* m\|M minutes
	298	* h\|H hours
	299	* d\|D days
	300	* w\|W weeks
	301	*
	302	* Examples:
	303	* 90m 90 minutes
	304	* 1h30m 90 minutes
	305	* 2d 2 days
	306	* 1w 1 week
	307	*
	308	* Return -1 if time string is invalid.
	309	*/
	310	long
	311	convtime(const char *s)
	312	{
	313	long total, secs;
	314	const char *p;
	315	char *endp;
	316
	317	errno = 0;
	318	total = 0;
	319	p = s;
	320
	321	if (p == NULL \|\| *p == '\0')
	322	return -1;
	323
	324	while (*p) {
	325	secs = strtol(p, &endp, 10);
	326	if (p == endp \|\|
	327	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
	328	secs < 0)
	329	return -1;
	330
	331	switch (*endp++) {
	332	case '\0':
	333	endp--;
30460aeb	334	break;
3c0ef626	335	case 's':
	336	case 'S':
	337	break;
	338	case 'm':
	339	case 'M':
	340	secs *= MINUTES;
	341	break;
	342	case 'h':
	343	case 'H':
	344	secs *= HOURS;
	345	break;
	346	case 'd':
	347	case 'D':
	348	secs *= DAYS;
	349	break;
	350	case 'w':
	351	case 'W':
	352	secs *= WEEKS;
	353	break;
	354	default:
	355	return -1;
	356	}
	357	total += secs;
	358	if (total < 0)
	359	return -1;
	360	p = endp;
	361	}
	362
	363	return total;
	364	}
	365
30460aeb	366	/*
	367	* Returns a standardized host+port identifier string.
	368	* Caller must free returned string.
	369	*/
	370	char *
	371	put_host_port(const char *host, u_short port)
	372	{
	373	char *hoststr;
	374
	375	if (port == 0 \|\| port == SSH_DEFAULT_PORT)
	376	return(xstrdup(host));
	377	if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
	378	fatal("put_host_port: asprintf: %s", strerror(errno));
	379	debug3("put_host_port: %s", hoststr);
	380	return hoststr;
	381	}
	382
dfddba3d	383	/*
	384	* Search for next delimiter between hostnames/addresses and ports.
	385	* Argument may be modified (for termination).
	386	* Returns *cp if parsing succeeds.
	387	* *cp is set to the start of the next delimiter, if one was found.
	388	* If this is the last field, *cp is set to NULL.
	389	*/
	390	char *
	391	hpdelim(char **cp)
	392	{
	393	char s, old;
	394
	395	if (cp == NULL \|\| *cp == NULL)
	396	return NULL;
	397
	398	old = s = *cp;
	399	if (*s == '[') {
	400	if ((s = strchr(s, ']')) == NULL)
	401	return NULL;
	402	else
	403	s++;
	404	} else if ((s = strpbrk(s, ":/")) == NULL)
	405	s = cp + strlen(cp); /* skip to end (see first case below) */
	406
	407	switch (*s) {
	408	case '\0':
	409	cp = NULL; / no more fields*/
	410	break;
8b32eddc	411
dfddba3d	412	case ':':
	413	case '/':
	414	s = '\0'; / terminate */
	415	*cp = s + 1;
	416	break;
8b32eddc	417
dfddba3d	418	default:
	419	return NULL;
	420	}
	421
	422	return old;
	423	}
	424
3c0ef626	425	char *
	426	cleanhostname(char *host)
	427	{
	428	if (*host == '[' && host[strlen(host) - 1] == ']') {
	429	host[strlen(host) - 1] = '\0';
	430	return (host + 1);
	431	} else
	432	return host;
	433	}
	434
	435	char *
	436	colon(char *cp)
	437	{
	438	int flag = 0;
	439
	440	if (cp == ':') / Leading colon is part of file name. */
	441	return (0);
	442	if (*cp == '[')
	443	flag = 1;
	444
	445	for (; *cp; ++cp) {
	446	if (cp == '@' && (cp+1) == '[')
	447	flag = 1;
	448	if (cp == ']' && (cp+1) == ':' && flag)
	449	return (cp+1);
	450	if (*cp == ':' && !flag)
	451	return (cp);
	452	if (*cp == '/')
	453	return (0);
	454	}
	455	return (0);
	456	}
	457
	458	/* function to assist building execv() arguments */
	459	void
	460	addargs(arglist args, char fmt, ...)
	461	{
	462	va_list ap;
08822d99	463	char *cp;
7e82606e	464	u_int nalloc;
08822d99	465	int r;
3c0ef626	466
3c0ef626	467	va_start(ap, fmt);
08822d99	468	r = vasprintf(&cp, fmt, ap);
3c0ef626	469	va_end(ap);
08822d99	470	if (r == -1)
08822d99	471	fatal("addargs: argument too long");
3c0ef626	472
29d88157	473	nalloc = args->nalloc;
3c0ef626	474	if (args->list == NULL) {
29d88157	475	nalloc = 32;
3c0ef626	476	args->num = 0;
29d88157	477	} else if (args->num+2 >= nalloc)
29d88157	478	nalloc *= 2;
3c0ef626	479
30460aeb	480	args->list = xrealloc(args->list, nalloc, sizeof(char *));
29d88157	481	args->nalloc = nalloc;
08822d99	482	args->list[args->num++] = cp;
3c0ef626	483	args->list[args->num] = NULL;
3c0ef626	484	}
dfddba3d	485
08822d99	486	void
	487	replacearg(arglist args, u_int which, char fmt, ...)
	488	{
	489	va_list ap;
	490	char *cp;
	491	int r;
	492
	493	va_start(ap, fmt);
	494	r = vasprintf(&cp, fmt, ap);
	495	va_end(ap);
	496	if (r == -1)
	497	fatal("replacearg: argument too long");
	498
	499	if (which >= args->num)
	500	fatal("replacearg: tried to replace invalid arg %d >= %d",
	501	which, args->num);
	502	xfree(args->list[which]);
	503	args->list[which] = cp;
	504	}
	505
	506	void
	507	freeargs(arglist *args)
	508	{
	509	u_int i;
	510
	511	if (args->list != NULL) {
	512	for (i = 0; i < args->num; i++)
	513	xfree(args->list[i]);
	514	xfree(args->list);
	515	args->nalloc = args->num = 0;
	516	args->list = NULL;
	517	}
	518	}
	519
2ce0bfe4	520	/*
	521	* Expands tildes in the file name. Returns data allocated by xmalloc.
	522	* Warning: this calls getpw*.
	523	*/
	524	char *
	525	tilde_expand_filename(const char *filename, uid_t uid)
	526	{
	527	const char *path;
	528	char user[128], ret[MAXPATHLEN];
	529	struct passwd *pw;
	530	u_int len, slash;
	531
	532	if (*filename != '~')
	533	return (xstrdup(filename));
	534	filename++;
	535
	536	path = strchr(filename, '/');
	537	if (path != NULL && path > filename) { /* ~user/path */
	538	slash = path - filename;
	539	if (slash > sizeof(user) - 1)
	540	fatal("tilde_expand_filename: ~username too long");
	541	memcpy(user, filename, slash);
	542	user[slash] = '\0';
	543	if ((pw = getpwnam(user)) == NULL)
	544	fatal("tilde_expand_filename: No such user %s", user);
	545	} else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
	546	fatal("tilde_expand_filename: No such uid %d", uid);
	547
	548	if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
	549	fatal("tilde_expand_filename: Path too long");
	550
	551	/* Make sure directory has a trailing '/' */
	552	len = strlen(pw->pw_dir);
	553	if ((len == 0 \|\| pw->pw_dir[len - 1] != '/') &&
	554	strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
	555	fatal("tilde_expand_filename: Path too long");
	556
	557	/* Skip leading '/' from specified path */
	558	if (path != NULL)
	559	filename = path + 1;
	560	if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
	561	fatal("tilde_expand_filename: Path too long");
	562
	563	return (xstrdup(ret));
	564	}
	565
	566	/*
	567	* Expand a string with a set of %[char] escapes. A number of escapes may be
	568	* specified as (char escape_chars, char replacement) pairs. The list must
	569	* be terminated by a NULL escape_char. Returns replaced string in memory
	570	* allocated by xmalloc.
	571	*/
	572	char *
	573	percent_expand(const char *string, ...)
	574	{
	575	#define EXPAND_MAX_KEYS 16
	576	struct {
	577	const char *key;
	578	const char *repl;
	579	} keys[EXPAND_MAX_KEYS];
	580	u_int num_keys, i, j;
	581	char buf[4096];
	582	va_list ap;
	583
584	/* Gather keys */
585	va_start(ap, string);
586	for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
587	keys[num_keys].key = va_arg(ap, char *);
588	if (keys[num_keys].key == NULL)
589	break;
590	keys[num_keys].repl = va_arg(ap, char *);
591	if (keys[num_keys].repl == NULL)
592	fatal("percent_expand: NULL replacement");
593	}
594	va_end(ap);
595
596	if (num_keys >= EXPAND_MAX_KEYS)
597	fatal("percent_expand: too many keys");
598
599	/* Expand string */
600	*buf = '\0';
601	for (i = 0; *string != '\0'; string++) {
602	if (*string != '%') {
603	append:
604	buf[i++] = *string;
605	if (i >= sizeof(buf))
606	fatal("percent_expand: string too long");
607	buf[i] = '\0';
608	continue;
609	}
610	string++;
611	if (*string == '%')
612	goto append;
613	for (j = 0; j < num_keys; j++) {
614	if (strchr(keys[j].key, *string) != NULL) {
615	i = strlcat(buf, keys[j].repl, sizeof(buf));
616	if (i >= sizeof(buf))
617	fatal("percent_expand: string too long");
618	break;
619	}
620	}
621	if (j >= num_keys)
622	fatal("percent_expand: unknown key %%%c", *string);
623	}
624	return (xstrdup(buf));
625	#undef EXPAND_MAX_KEYS
626	}
627
dfddba3d	628	/*
	629	* Read an entire line from a public key file into a static buffer, discarding
	630	* lines that exceed the buffer size. Returns 0 on success, -1 on failure.
	631	*/
	632	int
	633	read_keyfile_line(FILE f, const char filename, char *buf, size_t bufsz,
	634	u_long *lineno)
	635	{
	636	while (fgets(buf, bufsz, f) != NULL) {
	637	(*lineno)++;
	638	if (buf[strlen(buf) - 1] == '\n' \|\| feof(f)) {
	639	return 0;
	640	} else {
	641	debug("%s: %s line %lu exceeds size limit", __func__,
	642	filename, *lineno);
	643	/* discard remainder of line */
8b32eddc	644	while (fgetc(f) != '\n' && !feof(f))
dfddba3d	645	; /* nothing */
	646	}
	647	}
	648	return -1;
	649	}
2ce0bfe4	650
08822d99	651	int
	652	tun_open(int tun, int mode)
	653	{
	654	#if defined(CUSTOM_SYS_TUN_OPEN)
	655	return (sys_tun_open(tun, mode));
	656	#elif defined(SSH_TUN_OPENBSD)
	657	struct ifreq ifr;
	658	char name[100];
	659	int fd = -1, sock;
	660
	661	/* Open the tunnel device */
	662	if (tun <= SSH_TUNID_MAX) {
	663	snprintf(name, sizeof(name), "/dev/tun%d", tun);
	664	fd = open(name, O_RDWR);
	665	} else if (tun == SSH_TUNID_ANY) {
	666	for (tun = 100; tun >= 0; tun--) {
	667	snprintf(name, sizeof(name), "/dev/tun%d", tun);
	668	if ((fd = open(name, O_RDWR)) >= 0)
	669	break;
	670	}
	671	} else {
	672	debug("%s: invalid tunnel %u", __func__, tun);
	673	return (-1);
	674	}
	675
	676	if (fd < 0) {
	677	debug("%s: %s open failed: %s", __func__, name, strerror(errno));
	678	return (-1);
	679	}
	680
	681	debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
	682
	683	/* Set the tunnel device operation mode */
	684	snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
	685	if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
	686	goto failed;
	687
	688	if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
	689	goto failed;
	690
	691	/* Set interface mode */
	692	ifr.ifr_flags &= ~IFF_UP;
	693	if (mode == SSH_TUNMODE_ETHERNET)
	694	ifr.ifr_flags \|= IFF_LINK0;
	695	else
	696	ifr.ifr_flags &= ~IFF_LINK0;
	697	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
	698	goto failed;
	699
	700	/* Bring interface up */
	701	ifr.ifr_flags \|= IFF_UP;
	702	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
	703	goto failed;
	704
	705	close(sock);
	706	return (fd);
	707
	708	failed:
	709	if (fd >= 0)
	710	close(fd);
	711	if (sock >= 0)
	712	close(sock);
	713	debug("%s: failed to set %s mode %d: %s", __func__, name,
	714	mode, strerror(errno));
715	return (-1);
716	#else
717	error("Tunnel interfaces are not supported on this platform");
718	return (-1);
719	#endif
720	}
721
722	void
723	sanitise_stdfd(void)
724	{
725	int nullfd, dupfd;
726
727	if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
728	fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
729	exit(1);
730	}
731	while (++dupfd <= 2) {
732	/* Only clobber closed fds */
733	if (fcntl(dupfd, F_GETFL, 0) >= 0)
734	continue;
735	if (dup2(nullfd, dupfd) == -1) {
736	fprintf(stderr, "dup2: %s", strerror(errno));
737	exit(1);
738	}
739	}
740	if (nullfd > 2)
741	close(nullfd);
742	}
743
2ce0bfe4	744	char *
30460aeb	745	tohex(const void *vp, size_t l)
2ce0bfe4	746	{
30460aeb	747	const u_char p = (const u_char )vp;
2ce0bfe4	748	char b[3], *r;
30460aeb	749	size_t i, hl;
	750
	751	if (l > 65536)
	752	return xstrdup("tohex: length > 65536");
2ce0bfe4	753
2ce0bfe4	754	hl = l * 2 + 1;
30460aeb	755	r = xcalloc(1, hl);
2ce0bfe4	756	for (i = 0; i < l; i++) {
30460aeb	757	snprintf(b, sizeof(b), "%02x", p[i]);
2ce0bfe4	758	strlcat(r, b, hl);
	759	}
	760	return (r);
	761	}
	762
30460aeb	763	u_int64_t
	764	get_u64(const void *vp)
	765	{
	766	const u_char p = (const u_char )vp;
	767	u_int64_t v;
	768
	769	v = (u_int64_t)p[0] << 56;
	770	v \|= (u_int64_t)p[1] << 48;
	771	v \|= (u_int64_t)p[2] << 40;
	772	v \|= (u_int64_t)p[3] << 32;
	773	v \|= (u_int64_t)p[4] << 24;
	774	v \|= (u_int64_t)p[5] << 16;
	775	v \|= (u_int64_t)p[6] << 8;
	776	v \|= (u_int64_t)p[7];
	777
	778	return (v);
	779	}
	780
	781	u_int32_t
	782	get_u32(const void *vp)
	783	{
	784	const u_char p = (const u_char )vp;
	785	u_int32_t v;
	786
	787	v = (u_int32_t)p[0] << 24;
	788	v \|= (u_int32_t)p[1] << 16;
	789	v \|= (u_int32_t)p[2] << 8;
	790	v \|= (u_int32_t)p[3];
	791
	792	return (v);
	793	}
	794
	795	u_int16_t
	796	get_u16(const void *vp)
	797	{
	798	const u_char p = (const u_char )vp;
	799	u_int16_t v;
	800
	801	v = (u_int16_t)p[0] << 8;
	802	v \|= (u_int16_t)p[1];
	803
	804	return (v);
	805	}
	806
	807	void
	808	put_u64(void *vp, u_int64_t v)
	809	{
	810	u_char p = (u_char )vp;
	811
	812	p[0] = (u_char)(v >> 56) & 0xff;
	813	p[1] = (u_char)(v >> 48) & 0xff;
	814	p[2] = (u_char)(v >> 40) & 0xff;
	815	p[3] = (u_char)(v >> 32) & 0xff;
	816	p[4] = (u_char)(v >> 24) & 0xff;
	817	p[5] = (u_char)(v >> 16) & 0xff;
	818	p[6] = (u_char)(v >> 8) & 0xff;
	819	p[7] = (u_char)v & 0xff;
	820	}
	821
	822	void
	823	put_u32(void *vp, u_int32_t v)
	824	{
	825	u_char p = (u_char )vp;
	826
827	p[0] = (u_char)(v >> 24) & 0xff;
828	p[1] = (u_char)(v >> 16) & 0xff;
829	p[2] = (u_char)(v >> 8) & 0xff;
830	p[3] = (u_char)v & 0xff;
831	}
832
833
834	void
835	put_u16(void *vp, u_int16_t v)
836	{
837	u_char p = (u_char )vp;
838
839	p[0] = (u_char)(v >> 8) & 0xff;
840	p[1] = (u_char)v & 0xff;
841	}