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

/* $OpenBSD: misc.c,v 1.67 2008/01/01 08:47:04 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/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>
#include <netdb.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);
}

const char *
ssh_gai_strerror(int gaierr)
{
	if (gaierr == EAI_SYSTEM)
		return strerror(errno);
	return gai_strerror(gaierr);
}

/* 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) {
		if (buf[0] == '\0')
			continue;
		(*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
47686178	1	/* $OpenBSD: misc.c,v 1.67 2008/01/01 08:47:04 dtucker Exp $ */
3c0ef626	2	/*
3c0ef626	3	* Copyright (c) 2000 Markus Friedl. All rights reserved.
9108f8d9	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"
2c06c99b	28
9108f8d9	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>
47686178	45	#include <netdb.h>
9108f8d9	46	#ifdef HAVE_PATHS_H
	47	# include <paths.h>
	48	#include <pwd.h>
	49	#endif
2c06c99b	50	#ifdef SSH_TUN_OPENBSD
	51	#include <net/if.h>
	52	#endif
3c0ef626	53
9108f8d9	54	#include "xmalloc.h"
3c0ef626	55	#include "misc.h"
3c0ef626	56	#include "log.h"
9108f8d9	57	#include "ssh.h"
3c0ef626	58
	59	/* remove newline at end of string */
	60	char *
	61	chop(char *s)
	62	{
	63	char *t = s;
	64	while (*t) {
e9a17296	65	if (t == '\n' \|\| t == '\r') {
3c0ef626	66	*t = '\0';
	67	return s;
	68	}
	69	t++;
	70	}
	71	return s;
	72
	73	}
	74
	75	/* set/unset filedescriptor to non-blocking */
c9f39d2c	76	int
3c0ef626	77	set_nonblock(int fd)
	78	{
	79	int val;
	80
	81	val = fcntl(fd, F_GETFL, 0);
	82	if (val < 0) {
	83	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
c9f39d2c	84	return (-1);
3c0ef626	85	}
3c0ef626	86	if (val & O_NONBLOCK) {
c9f39d2c	87	debug3("fd %d is O_NONBLOCK", fd);
c9f39d2c	88	return (0);
3c0ef626	89	}
0fff78ff	90	debug2("fd %d setting O_NONBLOCK", fd);
3c0ef626	91	val \|= O_NONBLOCK;
c9f39d2c	92	if (fcntl(fd, F_SETFL, val) == -1) {
	93	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
	94	strerror(errno));
	95	return (-1);
	96	}
	97	return (0);
3c0ef626	98	}
3c0ef626	99
c9f39d2c	100	int
3c0ef626	101	unset_nonblock(int fd)
	102	{
	103	int val;
	104
	105	val = fcntl(fd, F_GETFL, 0);
	106	if (val < 0) {
	107	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
c9f39d2c	108	return (-1);
3c0ef626	109	}
3c0ef626	110	if (!(val & O_NONBLOCK)) {
c9f39d2c	111	debug3("fd %d is not O_NONBLOCK", fd);
c9f39d2c	112	return (0);
3c0ef626	113	}
	114	debug("fd %d clearing O_NONBLOCK", fd);
	115	val &= ~O_NONBLOCK;
c9f39d2c	116	if (fcntl(fd, F_SETFL, val) == -1) {
c9f39d2c	117	debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
e9a17296	118	fd, strerror(errno));
c9f39d2c	119	return (-1);
	120	}
	121	return (0);
e9a17296	122	}
e9a17296	123
47686178	124	const char *
	125	ssh_gai_strerror(int gaierr)
	126	{
	127	if (gaierr == EAI_SYSTEM)
	128	return strerror(errno);
	129	return gai_strerror(gaierr);
	130	}
	131
e9a17296	132	/* disable nagle on socket */
	133	void
	134	set_nodelay(int fd)
	135	{
	136	int opt;
	137	socklen_t optlen;
	138
	139	optlen = sizeof opt;
	140	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
cdd66111	141	debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
e9a17296	142	return;
	143	}
	144	if (opt == 1) {
	145	debug2("fd %d is TCP_NODELAY", fd);
	146	return;
	147	}
	148	opt = 1;
6a9b3198	149	debug2("fd %d setting TCP_NODELAY", fd);
e9a17296	150	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
e9a17296	151	error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
3c0ef626	152	}
	153
	154	/* Characters considered whitespace in strsep calls. */
	155	#define WHITESPACE " \t\r\n"
9108f8d9	156	#define QUOTE "\""
3c0ef626	157
	158	/* return next token in configuration line */
	159	char *
	160	strdelim(char **s)
	161	{
	162	char *old;
	163	int wspace = 0;
	164
	165	if (*s == NULL)
	166	return NULL;
	167
	168	old = *s;
	169
9108f8d9	170	s = strpbrk(s, WHITESPACE QUOTE "=");
3c0ef626	171	if (*s == NULL)
	172	return (old);
	173
9108f8d9	174	if (*s[0] == '\"') {
	175	memmove(s, s + 1, strlen(s)); / move nul too */
	176	/* Find matching quote */
	177	if ((s = strpbrk(s, QUOTE)) == NULL) {
	178	return (NULL); /* no matching quote */
	179	} else {
	180	*s[0] = '\0';
	181	return (old);
	182	}
	183	}
	184
3c0ef626	185	/* Allow only one '=' to be skipped */
	186	if (*s[0] == '=')
	187	wspace = 1;
	188	*s[0] = '\0';
	189
9108f8d9	190	/* Skip any extra whitespace after first token */
3c0ef626	191	s += strspn(s + 1, WHITESPACE) + 1;
	192	if (*s[0] == '=' && !wspace)
	193	s += strspn(s + 1, WHITESPACE) + 1;
	194
	195	return (old);
	196	}
	197
	198	struct passwd *
	199	pwcopy(struct passwd *pw)
	200	{
9108f8d9	201	struct passwd copy = xcalloc(1, sizeof(copy));
3c0ef626	202
3c0ef626	203	copy->pw_name = xstrdup(pw->pw_name);
	204	copy->pw_passwd = xstrdup(pw->pw_passwd);
	205	copy->pw_gecos = xstrdup(pw->pw_gecos);
	206	copy->pw_uid = pw->pw_uid;
	207	copy->pw_gid = pw->pw_gid;
	208	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
	209	copy->pw_expire = pw->pw_expire;
	210	#endif
	211	#ifdef HAVE_PW_CHANGE_IN_PASSWD
	212	copy->pw_change = pw->pw_change;
	213	#endif
	214	#ifdef HAVE_PW_CLASS_IN_PASSWD
	215	copy->pw_class = xstrdup(pw->pw_class);
	216	#endif
	217	copy->pw_dir = xstrdup(pw->pw_dir);
	218	copy->pw_shell = xstrdup(pw->pw_shell);
	219	return copy;
	220	}
	221
	222	/*
	223	* Convert ASCII string to TCP/IP port number.
	224	* Port must be >0 and <=65535.
	225	* Return 0 if invalid.
	226	*/
	227	int
	228	a2port(const char *s)
	229	{
	230	long port;
	231	char *endp;
	232
	233	errno = 0;
	234	port = strtol(s, &endp, 0);
	235	if (s == endp \|\| *endp != '\0' \|\|
	236	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	237	port <= 0 \|\| port > 65535)
	238	return 0;
	239
	240	return port;
	241	}
	242
2c06c99b	243	int
	244	a2tun(const char s, int remote)
	245	{
	246	const char *errstr = NULL;
	247	char sp, ep;
	248	int tun;
	249
	250	if (remote != NULL) {
	251	*remote = SSH_TUNID_ANY;
	252	sp = xstrdup(s);
	253	if ((ep = strchr(sp, ':')) == NULL) {
	254	xfree(sp);
	255	return (a2tun(s, NULL));
	256	}
	257	ep[0] = '\0'; ep++;
	258	*remote = a2tun(ep, NULL);
	259	tun = a2tun(sp, NULL);
	260	xfree(sp);
	261	return (remote == SSH_TUNID_ERR ? remote : tun);
	262	}
	263
	264	if (strcasecmp(s, "any") == 0)
	265	return (SSH_TUNID_ANY);
	266
	267	tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
	268	if (errstr != NULL)
	269	return (SSH_TUNID_ERR);
	270
	271	return (tun);
	272	}
	273
3c0ef626	274	#define SECONDS 1
	275	#define MINUTES (SECONDS * 60)
	276	#define HOURS (MINUTES * 60)
	277	#define DAYS (HOURS * 24)
	278	#define WEEKS (DAYS * 7)
	279
	280	/*
	281	* Convert a time string into seconds; format is
	282	* a sequence of:
	283	* time[qualifier]
	284	*
	285	* Valid time qualifiers are:
	286	* <none> seconds
	287	* s\|S seconds
	288	* m\|M minutes
	289	* h\|H hours
	290	* d\|D days
	291	* w\|W weeks
	292	*
	293	* Examples:
	294	* 90m 90 minutes
	295	* 1h30m 90 minutes
	296	* 2d 2 days
	297	* 1w 1 week
	298	*
	299	* Return -1 if time string is invalid.
	300	*/
	301	long
	302	convtime(const char *s)
	303	{
	304	long total, secs;
	305	const char *p;
	306	char *endp;
	307
	308	errno = 0;
	309	total = 0;
	310	p = s;
	311
	312	if (p == NULL \|\| *p == '\0')
	313	return -1;
	314
	315	while (*p) {
	316	secs = strtol(p, &endp, 10);
	317	if (p == endp \|\|
	318	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
	319	secs < 0)
	320	return -1;
	321
	322	switch (*endp++) {
	323	case '\0':
	324	endp--;
9108f8d9	325	break;
3c0ef626	326	case 's':
	327	case 'S':
	328	break;
	329	case 'm':
	330	case 'M':
	331	secs *= MINUTES;
	332	break;
	333	case 'h':
	334	case 'H':
	335	secs *= HOURS;
	336	break;
	337	case 'd':
	338	case 'D':
	339	secs *= DAYS;
	340	break;
	341	case 'w':
	342	case 'W':
	343	secs *= WEEKS;
	344	break;
	345	default:
	346	return -1;
	347	}
	348	total += secs;
	349	if (total < 0)
	350	return -1;
	351	p = endp;
	352	}
	353
	354	return total;
	355	}
	356
9108f8d9	357	/*
	358	* Returns a standardized host+port identifier string.
	359	* Caller must free returned string.
	360	*/
	361	char *
	362	put_host_port(const char *host, u_short port)
	363	{
	364	char *hoststr;
	365
	366	if (port == 0 \|\| port == SSH_DEFAULT_PORT)
	367	return(xstrdup(host));
	368	if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
	369	fatal("put_host_port: asprintf: %s", strerror(errno));
	370	debug3("put_host_port: %s", hoststr);
	371	return hoststr;
	372	}
	373
996d5e62	374	/*
	375	* Search for next delimiter between hostnames/addresses and ports.
	376	* Argument may be modified (for termination).
	377	* Returns *cp if parsing succeeds.
	378	* *cp is set to the start of the next delimiter, if one was found.
	379	* If this is the last field, *cp is set to NULL.
	380	*/
	381	char *
	382	hpdelim(char **cp)
	383	{
	384	char s, old;
	385
	386	if (cp == NULL \|\| *cp == NULL)
	387	return NULL;
	388
	389	old = s = *cp;
	390	if (*s == '[') {
	391	if ((s = strchr(s, ']')) == NULL)
	392	return NULL;
	393	else
	394	s++;
	395	} else if ((s = strpbrk(s, ":/")) == NULL)
	396	s = cp + strlen(cp); /* skip to end (see first case below) */
	397
	398	switch (*s) {
	399	case '\0':
	400	cp = NULL; / no more fields*/
	401	break;
dec6d9fe	402
996d5e62	403	case ':':
	404	case '/':
	405	s = '\0'; / terminate */
	406	*cp = s + 1;
	407	break;
dec6d9fe	408
996d5e62	409	default:
	410	return NULL;
	411	}
	412
	413	return old;
	414	}
	415
3c0ef626	416	char *
	417	cleanhostname(char *host)
	418	{
	419	if (*host == '[' && host[strlen(host) - 1] == ']') {
	420	host[strlen(host) - 1] = '\0';
	421	return (host + 1);
	422	} else
	423	return host;
	424	}
	425
	426	char *
	427	colon(char *cp)
	428	{
	429	int flag = 0;
	430
	431	if (cp == ':') / Leading colon is part of file name. */
	432	return (0);
	433	if (*cp == '[')
	434	flag = 1;
	435
	436	for (; *cp; ++cp) {
	437	if (cp == '@' && (cp+1) == '[')
	438	flag = 1;
	439	if (cp == ']' && (cp+1) == ':' && flag)
	440	return (cp+1);
	441	if (*cp == ':' && !flag)
	442	return (cp);
	443	if (*cp == '/')
	444	return (0);
	445	}
	446	return (0);
	447	}
	448
	449	/* function to assist building execv() arguments */
	450	void
	451	addargs(arglist args, char fmt, ...)
	452	{
	453	va_list ap;
2c06c99b	454	char *cp;
c9f39d2c	455	u_int nalloc;
2c06c99b	456	int r;
3c0ef626	457
3c0ef626	458	va_start(ap, fmt);
2c06c99b	459	r = vasprintf(&cp, fmt, ap);
3c0ef626	460	va_end(ap);
2c06c99b	461	if (r == -1)
2c06c99b	462	fatal("addargs: argument too long");
3c0ef626	463
acc3d05e	464	nalloc = args->nalloc;
3c0ef626	465	if (args->list == NULL) {
acc3d05e	466	nalloc = 32;
3c0ef626	467	args->num = 0;
acc3d05e	468	} else if (args->num+2 >= nalloc)
acc3d05e	469	nalloc *= 2;
3c0ef626	470
9108f8d9	471	args->list = xrealloc(args->list, nalloc, sizeof(char *));
acc3d05e	472	args->nalloc = nalloc;
2c06c99b	473	args->list[args->num++] = cp;
3c0ef626	474	args->list[args->num] = NULL;
3c0ef626	475	}
996d5e62	476
2c06c99b	477	void
	478	replacearg(arglist args, u_int which, char fmt, ...)
	479	{
	480	va_list ap;
	481	char *cp;
	482	int r;
	483
	484	va_start(ap, fmt);
	485	r = vasprintf(&cp, fmt, ap);
	486	va_end(ap);
	487	if (r == -1)
	488	fatal("replacearg: argument too long");
	489
	490	if (which >= args->num)
	491	fatal("replacearg: tried to replace invalid arg %d >= %d",
	492	which, args->num);
	493	xfree(args->list[which]);
	494	args->list[which] = cp;
	495	}
	496
	497	void
	498	freeargs(arglist *args)
	499	{
	500	u_int i;
	501
	502	if (args->list != NULL) {
	503	for (i = 0; i < args->num; i++)
	504	xfree(args->list[i]);
	505	xfree(args->list);
	506	args->nalloc = args->num = 0;
	507	args->list = NULL;
	508	}
	509	}
	510
665a873d	511	/*
	512	* Expands tildes in the file name. Returns data allocated by xmalloc.
	513	* Warning: this calls getpw*.
	514	*/
	515	char *
	516	tilde_expand_filename(const char *filename, uid_t uid)
	517	{
	518	const char *path;
	519	char user[128], ret[MAXPATHLEN];
	520	struct passwd *pw;
	521	u_int len, slash;
	522
	523	if (*filename != '~')
	524	return (xstrdup(filename));
	525	filename++;
	526
	527	path = strchr(filename, '/');
	528	if (path != NULL && path > filename) { /* ~user/path */
	529	slash = path - filename;
	530	if (slash > sizeof(user) - 1)
	531	fatal("tilde_expand_filename: ~username too long");
	532	memcpy(user, filename, slash);
	533	user[slash] = '\0';
	534	if ((pw = getpwnam(user)) == NULL)
	535	fatal("tilde_expand_filename: No such user %s", user);
	536	} else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
	537	fatal("tilde_expand_filename: No such uid %d", uid);
	538
	539	if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
	540	fatal("tilde_expand_filename: Path too long");
	541
	542	/* Make sure directory has a trailing '/' */
	543	len = strlen(pw->pw_dir);
	544	if ((len == 0 \|\| pw->pw_dir[len - 1] != '/') &&
	545	strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
	546	fatal("tilde_expand_filename: Path too long");
	547
	548	/* Skip leading '/' from specified path */
	549	if (path != NULL)
	550	filename = path + 1;
	551	if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
	552	fatal("tilde_expand_filename: Path too long");
	553
	554	return (xstrdup(ret));
	555	}
	556
	557	/*
	558	* Expand a string with a set of %[char] escapes. A number of escapes may be
	559	* specified as (char escape_chars, char replacement) pairs. The list must
	560	* be terminated by a NULL escape_char. Returns replaced string in memory
	561	* allocated by xmalloc.
	562	*/
	563	char *
	564	percent_expand(const char *string, ...)
	565	{
	566	#define EXPAND_MAX_KEYS 16
	567	struct {
	568	const char *key;
	569	const char *repl;
	570	} keys[EXPAND_MAX_KEYS];
	571	u_int num_keys, i, j;
	572	char buf[4096];
	573	va_list ap;
	574
575	/* Gather keys */
576	va_start(ap, string);
577	for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
578	keys[num_keys].key = va_arg(ap, char *);
579	if (keys[num_keys].key == NULL)
580	break;
581	keys[num_keys].repl = va_arg(ap, char *);
582	if (keys[num_keys].repl == NULL)
583	fatal("percent_expand: NULL replacement");
584	}
585	va_end(ap);
586
587	if (num_keys >= EXPAND_MAX_KEYS)
588	fatal("percent_expand: too many keys");
589
590	/* Expand string */
591	*buf = '\0';
592	for (i = 0; *string != '\0'; string++) {
593	if (*string != '%') {
594	append:
595	buf[i++] = *string;
596	if (i >= sizeof(buf))
597	fatal("percent_expand: string too long");
598	buf[i] = '\0';
599	continue;
600	}
601	string++;
602	if (*string == '%')
603	goto append;
604	for (j = 0; j < num_keys; j++) {
605	if (strchr(keys[j].key, *string) != NULL) {
606	i = strlcat(buf, keys[j].repl, sizeof(buf));
607	if (i >= sizeof(buf))
608	fatal("percent_expand: string too long");
609	break;
610	}
611	}
612	if (j >= num_keys)
613	fatal("percent_expand: unknown key %%%c", *string);
614	}
615	return (xstrdup(buf));
616	#undef EXPAND_MAX_KEYS
617	}
618
996d5e62	619	/*
	620	* Read an entire line from a public key file into a static buffer, discarding
	621	* lines that exceed the buffer size. Returns 0 on success, -1 on failure.
	622	*/
	623	int
	624	read_keyfile_line(FILE f, const char filename, char *buf, size_t bufsz,
	625	u_long *lineno)
	626	{
	627	while (fgets(buf, bufsz, f) != NULL) {
799ae497	628	if (buf[0] == '\0')
799ae497	629	continue;
996d5e62	630	(*lineno)++;
	631	if (buf[strlen(buf) - 1] == '\n' \|\| feof(f)) {
	632	return 0;
	633	} else {
	634	debug("%s: %s line %lu exceeds size limit", __func__,
	635	filename, *lineno);
	636	/* discard remainder of line */
dec6d9fe	637	while (fgetc(f) != '\n' && !feof(f))
996d5e62	638	; /* nothing */
	639	}
	640	}
	641	return -1;
	642	}
665a873d	643
2c06c99b	644	int
	645	tun_open(int tun, int mode)
	646	{
	647	#if defined(CUSTOM_SYS_TUN_OPEN)
	648	return (sys_tun_open(tun, mode));
	649	#elif defined(SSH_TUN_OPENBSD)
	650	struct ifreq ifr;
	651	char name[100];
	652	int fd = -1, sock;
	653
	654	/* Open the tunnel device */
	655	if (tun <= SSH_TUNID_MAX) {
	656	snprintf(name, sizeof(name), "/dev/tun%d", tun);
	657	fd = open(name, O_RDWR);
	658	} else if (tun == SSH_TUNID_ANY) {
	659	for (tun = 100; tun >= 0; tun--) {
	660	snprintf(name, sizeof(name), "/dev/tun%d", tun);
	661	if ((fd = open(name, O_RDWR)) >= 0)
	662	break;
	663	}
	664	} else {
	665	debug("%s: invalid tunnel %u", __func__, tun);
	666	return (-1);
	667	}
	668
	669	if (fd < 0) {
	670	debug("%s: %s open failed: %s", __func__, name, strerror(errno));
	671	return (-1);
	672	}
	673
	674	debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
	675
	676	/* Set the tunnel device operation mode */
	677	snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
	678	if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
	679	goto failed;
	680
	681	if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
	682	goto failed;
	683
	684	/* Set interface mode */
	685	ifr.ifr_flags &= ~IFF_UP;
	686	if (mode == SSH_TUNMODE_ETHERNET)
	687	ifr.ifr_flags \|= IFF_LINK0;
	688	else
	689	ifr.ifr_flags &= ~IFF_LINK0;
	690	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
	691	goto failed;
	692
	693	/* Bring interface up */
	694	ifr.ifr_flags \|= IFF_UP;
	695	if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
	696	goto failed;
	697
	698	close(sock);
	699	return (fd);
	700
	701	failed:
	702	if (fd >= 0)
	703	close(fd);
	704	if (sock >= 0)
	705	close(sock);
	706	debug("%s: failed to set %s mode %d: %s", __func__, name,
	707	mode, strerror(errno));
708	return (-1);
709	#else
710	error("Tunnel interfaces are not supported on this platform");
711	return (-1);
712	#endif
713	}
714
715	void
716	sanitise_stdfd(void)
717	{
718	int nullfd, dupfd;
719
720	if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
721	fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
722	exit(1);
723	}
724	while (++dupfd <= 2) {
725	/* Only clobber closed fds */
726	if (fcntl(dupfd, F_GETFL, 0) >= 0)
727	continue;
728	if (dup2(nullfd, dupfd) == -1) {
729	fprintf(stderr, "dup2: %s", strerror(errno));
730	exit(1);
731	}
732	}
733	if (nullfd > 2)
734	close(nullfd);
735	}
736
665a873d	737	char *
9108f8d9	738	tohex(const void *vp, size_t l)
665a873d	739	{
9108f8d9	740	const u_char p = (const u_char )vp;
665a873d	741	char b[3], *r;
9108f8d9	742	size_t i, hl;
	743
	744	if (l > 65536)
	745	return xstrdup("tohex: length > 65536");
665a873d	746
665a873d	747	hl = l * 2 + 1;
9108f8d9	748	r = xcalloc(1, hl);
665a873d	749	for (i = 0; i < l; i++) {
9108f8d9	750	snprintf(b, sizeof(b), "%02x", p[i]);
665a873d	751	strlcat(r, b, hl);
	752	}
	753	return (r);
	754	}
	755
9108f8d9	756	u_int64_t
	757	get_u64(const void *vp)
	758	{
	759	const u_char p = (const u_char )vp;
	760	u_int64_t v;
	761
	762	v = (u_int64_t)p[0] << 56;
	763	v \|= (u_int64_t)p[1] << 48;
	764	v \|= (u_int64_t)p[2] << 40;
	765	v \|= (u_int64_t)p[3] << 32;
	766	v \|= (u_int64_t)p[4] << 24;
	767	v \|= (u_int64_t)p[5] << 16;
	768	v \|= (u_int64_t)p[6] << 8;
	769	v \|= (u_int64_t)p[7];
	770
	771	return (v);
	772	}
	773
	774	u_int32_t
	775	get_u32(const void *vp)
	776	{
	777	const u_char p = (const u_char )vp;
	778	u_int32_t v;
	779
	780	v = (u_int32_t)p[0] << 24;
	781	v \|= (u_int32_t)p[1] << 16;
	782	v \|= (u_int32_t)p[2] << 8;
	783	v \|= (u_int32_t)p[3];
	784
	785	return (v);
	786	}
	787
	788	u_int16_t
	789	get_u16(const void *vp)
	790	{
	791	const u_char p = (const u_char )vp;
	792	u_int16_t v;
	793
	794	v = (u_int16_t)p[0] << 8;
	795	v \|= (u_int16_t)p[1];
	796
	797	return (v);
	798	}
	799
	800	void
	801	put_u64(void *vp, u_int64_t v)
	802	{
	803	u_char p = (u_char )vp;
	804
	805	p[0] = (u_char)(v >> 56) & 0xff;
	806	p[1] = (u_char)(v >> 48) & 0xff;
	807	p[2] = (u_char)(v >> 40) & 0xff;
	808	p[3] = (u_char)(v >> 32) & 0xff;
	809	p[4] = (u_char)(v >> 24) & 0xff;
	810	p[5] = (u_char)(v >> 16) & 0xff;
	811	p[6] = (u_char)(v >> 8) & 0xff;
	812	p[7] = (u_char)v & 0xff;
	813	}
	814
	815	void
	816	put_u32(void *vp, u_int32_t v)
	817	{
	818	u_char p = (u_char )vp;
	819
820	p[0] = (u_char)(v >> 24) & 0xff;
821	p[1] = (u_char)(v >> 16) & 0xff;
822	p[2] = (u_char)(v >> 8) & 0xff;
823	p[3] = (u_char)v & 0xff;
824	}
825
826
827	void
828	put_u16(void *vp, u_int16_t v)
829	{
830	u_char p = (u_char )vp;
831
832	p[0] = (u_char)(v >> 8) & 0xff;
833	p[1] = (u_char)v & 0xff;
834	}