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

/*
 * Copyright (c) 2000 Markus Friedl.  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"
RCSID("$OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp $");

#include "misc.h"
#include "log.h"
#include "xmalloc.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 */
void
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;
	}
	if (val & O_NONBLOCK) {
		debug2("fd %d is O_NONBLOCK", fd);
		return;
	}
	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));
}

void
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;
	}
	if (!(val & O_NONBLOCK)) {
		debug2("fd %d is not O_NONBLOCK", fd);
		return;
	}
	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));
}

/* 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) {
		error("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"

/* 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 "=");
	if (*s == NULL)
		return (old);

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

	*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 = xmalloc(sizeof(*copy));

	memset(copy, 0, 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;
}

#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--;
		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;
}

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 buf[1024];
	int nalloc;

	va_start(ap, fmt);
	vsnprintf(buf, sizeof(buf), fmt, ap);
	va_end(ap);

	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++] = xstrdup(buf);
	args->list[args->num] = NULL;
}
Commit	Line	Data
3c0ef626	1	/*
	2	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
29d88157	26	RCSID("$OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp $");
3c0ef626	27
	28	#include "misc.h"
	29	#include "log.h"
	30	#include "xmalloc.h"
	31
	32	/* remove newline at end of string */
	33	char *
	34	chop(char *s)
	35	{
	36	char *t = s;
	37	while (*t) {
75be3237	38	if (t == '\n' \|\| t == '\r') {
3c0ef626	39	*t = '\0';
	40	return s;
	41	}
	42	t++;
	43	}
	44	return s;
	45
	46	}
	47
	48	/* set/unset filedescriptor to non-blocking */
	49	void
	50	set_nonblock(int fd)
	51	{
	52	int val;
	53
	54	val = fcntl(fd, F_GETFL, 0);
	55	if (val < 0) {
	56	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
	57	return;
	58	}
	59	if (val & O_NONBLOCK) {
	60	debug2("fd %d is O_NONBLOCK", fd);
	61	return;
	62	}
7cac2b65	63	debug2("fd %d setting O_NONBLOCK", fd);
3c0ef626	64	val \|= O_NONBLOCK;
3c0ef626	65	if (fcntl(fd, F_SETFL, val) == -1)
75be3237	66	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
75be3237	67	fd, strerror(errno));
3c0ef626	68	}
	69
	70	void
	71	unset_nonblock(int fd)
	72	{
	73	int val;
	74
	75	val = fcntl(fd, F_GETFL, 0);
	76	if (val < 0) {
	77	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
	78	return;
	79	}
	80	if (!(val & O_NONBLOCK)) {
	81	debug2("fd %d is not O_NONBLOCK", fd);
	82	return;
	83	}
	84	debug("fd %d clearing O_NONBLOCK", fd);
	85	val &= ~O_NONBLOCK;
	86	if (fcntl(fd, F_SETFL, val) == -1)
75be3237	87	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
	88	fd, strerror(errno));
	89	}
	90
	91	/* disable nagle on socket */
	92	void
	93	set_nodelay(int fd)
	94	{
	95	int opt;
	96	socklen_t optlen;
	97
	98	optlen = sizeof opt;
	99	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
	100	error("getsockopt TCP_NODELAY: %.100s", strerror(errno));
	101	return;
	102	}
	103	if (opt == 1) {
	104	debug2("fd %d is TCP_NODELAY", fd);
	105	return;
	106	}
	107	opt = 1;
	108	debug2("fd %d setting TCP_NODELAY", fd);
	109	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
	110	error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
3c0ef626	111	}
	112
	113	/* Characters considered whitespace in strsep calls. */
	114	#define WHITESPACE " \t\r\n"
	115
75be3237	116	/* Characters considered as quotations. */
	117	#define QUOTES "'\""
	118
3c0ef626	119	/* return next token in configuration line */
	120	char *
	121	strdelim(char **s)
	122	{
75be3237	123	char old, p, *q;
3c0ef626	124	int wspace = 0;
	125
	126	if (*s == NULL)
	127	return NULL;
	128
	129	old = *s;
	130
75be3237	131	if ((q=strchr(QUOTES, (int) old)) && q)
	132	{
	133	/* find next quote character, point old to start of quoted
	134	* string */
	135	for (p = ++old;p && p!=*q; p++)
	136	;
	137
	138	/* find start of next token */
	139	s = (p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL;
	140
	141	/* terminate 'old' token */
	142	*p = '\0';
	143	return (old);
	144	}
	145
	146	s = strpbrk(s, WHITESPACE "=");
3c0ef626	147	if (*s == NULL)
	148	return (old);
	149
	150	/* Allow only one '=' to be skipped */
	151	if (*s[0] == '=')
	152	wspace = 1;
	153	*s[0] = '\0';
	154
	155	s += strspn(s + 1, WHITESPACE) + 1;
	156	if (*s[0] == '=' && !wspace)
	157	s += strspn(s + 1, WHITESPACE) + 1;
	158
	159	return (old);
	160	}
	161
	162	struct passwd *
	163	pwcopy(struct passwd *pw)
	164	{
	165	struct passwd copy = xmalloc(sizeof(copy));
	166
	167	memset(copy, 0, sizeof(*copy));
	168	copy->pw_name = xstrdup(pw->pw_name);
	169	copy->pw_passwd = xstrdup(pw->pw_passwd);
	170	copy->pw_gecos = xstrdup(pw->pw_gecos);
	171	copy->pw_uid = pw->pw_uid;
	172	copy->pw_gid = pw->pw_gid;
	173	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
	174	copy->pw_expire = pw->pw_expire;
	175	#endif
	176	#ifdef HAVE_PW_CHANGE_IN_PASSWD
	177	copy->pw_change = pw->pw_change;
	178	#endif
	179	#ifdef HAVE_PW_CLASS_IN_PASSWD
	180	copy->pw_class = xstrdup(pw->pw_class);
	181	#endif
	182	copy->pw_dir = xstrdup(pw->pw_dir);
	183	copy->pw_shell = xstrdup(pw->pw_shell);
	184	return copy;
	185	}
	186
	187	/*
	188	* Convert ASCII string to TCP/IP port number.
	189	* Port must be >0 and <=65535.
	190	* Return 0 if invalid.
	191	*/
	192	int
	193	a2port(const char *s)
	194	{
	195	long port;
	196	char *endp;
	197
	198	errno = 0;
	199	port = strtol(s, &endp, 0);
	200	if (s == endp \|\| *endp != '\0' \|\|
	201	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	202	port <= 0 \|\| port > 65535)
	203	return 0;
	204
	205	return port;
	206	}
	207
	208	#define SECONDS 1
	209	#define MINUTES (SECONDS * 60)
	210	#define HOURS (MINUTES * 60)
211	#define DAYS (HOURS * 24)
212	#define WEEKS (DAYS * 7)
213
214	/*
215	* Convert a time string into seconds; format is
216	* a sequence of:
217	* time[qualifier]
218	*
219	* Valid time qualifiers are:
220	* <none> seconds
221	* s\|S seconds
222	* m\|M minutes
223	* h\|H hours
224	* d\|D days
225	* w\|W weeks
226	*
227	* Examples:
228	* 90m 90 minutes
229	* 1h30m 90 minutes
230	* 2d 2 days
231	* 1w 1 week
232	*
233	* Return -1 if time string is invalid.
234	*/
235	long
236	convtime(const char *s)
237	{
238	long total, secs;
239	const char *p;
240	char *endp;
241
242	errno = 0;
243	total = 0;
244	p = s;
245
246	if (p == NULL \|\| *p == '\0')
247	return -1;
248
249	while (*p) {
250	secs = strtol(p, &endp, 10);
251	if (p == endp \|\|
252	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
253	secs < 0)
254	return -1;
255
256	switch (*endp++) {
257	case '\0':
258	endp--;
259	case 's':
260	case 'S':
261	break;
262	case 'm':
263	case 'M':
264	secs *= MINUTES;
265	break;
266	case 'h':
267	case 'H':
268	secs *= HOURS;
269	break;
270	case 'd':
271	case 'D':
272	secs *= DAYS;
273	break;
274	case 'w':
275	case 'W':
276	secs *= WEEKS;
277	break;
278	default:
279	return -1;
280	}
281	total += secs;
282	if (total < 0)
283	return -1;
284	p = endp;
285	}
286
287	return total;
288	}
289
290	char *
291	cleanhostname(char *host)
292	{
293	if (*host == '[' && host[strlen(host) - 1] == ']') {
294	host[strlen(host) - 1] = '\0';
295	return (host + 1);
296	} else
297	return host;
298	}
299
300	char *
301	colon(char *cp)
302	{
303	int flag = 0;
304
305	if (cp == ':') / Leading colon is part of file name. */
306	return (0);
307	if (*cp == '[')
308	flag = 1;
309
310	for (; *cp; ++cp) {
311	if (cp == '@' && (cp+1) == '[')
312	flag = 1;
313	if (cp == ']' && (cp+1) == ':' && flag)
314	return (cp+1);
315	if (*cp == ':' && !flag)
316	return (cp);
317	if (*cp == '/')
318	return (0);
319	}
320	return (0);
321	}
322
323	/* function to assist building execv() arguments */
324	void
325	addargs(arglist args, char fmt, ...)
326	{
327	va_list ap;
328	char buf[1024];
29d88157	329	int nalloc;
3c0ef626	330
	331	va_start(ap, fmt);
	332	vsnprintf(buf, sizeof(buf), fmt, ap);
	333	va_end(ap);
	334
29d88157	335	nalloc = args->nalloc;
3c0ef626	336	if (args->list == NULL) {
29d88157	337	nalloc = 32;
3c0ef626	338	args->num = 0;
29d88157	339	} else if (args->num+2 >= nalloc)
29d88157	340	nalloc *= 2;
3c0ef626	341
29d88157	342	args->list = xrealloc(args->list, nalloc * sizeof(char *));
29d88157	343	args->nalloc = nalloc;
3c0ef626	344	args->list[args->num++] = xstrdup(buf);
	345	args->list[args->num] = NULL;
	346	}