[openssh.git] / misc.c

/*	$OpenBSD: misc.c,v 1.14 2001/12/19 07:18:56 deraadt Exp $	*/

/*
 * 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 1.14 2001/12/19 07:18:56 deraadt 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;
	}
	debug("fd %d setting O_NONBLOCK", fd);
	val |= O_NONBLOCK;
	if (fcntl(fd, F_SETFL, val) == -1)
		if (errno != ENODEV)
			error("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)
		if (errno != ENODEV)
			error("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
			    fd, strerror(errno));
}

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

/* 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 "=");
	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];

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

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

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

mysig_t
mysignal(int sig, mysig_t act)
{
#ifdef HAVE_SIGACTION
	struct sigaction sa, osa;

	if (sigaction(sig, NULL, &osa) == -1)
		return (mysig_t) -1;
	if (osa.sa_handler != act) {
		memset(&sa, 0, sizeof(sa));
		sigemptyset(&sa.sa_mask);
		sa.sa_flags = 0;
#if defined(SA_INTERRUPT)
		if (sig == SIGALRM)
			sa.sa_flags |= SA_INTERRUPT;
#endif
		sa.sa_handler = act;
		if (sigaction(sig, &sa, NULL) == -1)
			return (mysig_t) -1;
	}
	return (osa.sa_handler);
#else
	return (signal(sig, act));
#endif
}
Commit	Line	Data
184eed6a	1	/* $OpenBSD: misc.c,v 1.14 2001/12/19 07:18:56 deraadt Exp $ */
bcbf86ec	2
	3	/*
	4	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
6d24277f	27	#include "includes.h"
184eed6a	28	RCSID("$OpenBSD: misc.c,v 1.14 2001/12/19 07:18:56 deraadt Exp $");
6d24277f	29
1aa00dcb	30	#include "misc.h"
42f11eb2	31	#include "log.h"
4ab21f86	32	#include "xmalloc.h"
6d24277f	33
255cabd9	34	/* remove newline at end of string */
6d24277f	35	char *
	36	chop(char *s)
	37	{
	38	char *t = s;
	39	while (*t) {
6aacefa7	40	if (t == '\n' \|\| t == '\r') {
6d24277f	41	*t = '\0';
	42	return s;
	43	}
	44	t++;
	45	}
	46	return s;
	47
	48	}
	49
255cabd9	50	/* set/unset filedescriptor to non-blocking */
6d24277f	51	void
	52	set_nonblock(int fd)
	53	{
	54	int val;
89aa792b	55
6d24277f	56	val = fcntl(fd, F_GETFL, 0);
	57	if (val < 0) {
	58	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
	59	return;
	60	}
a22aff1f	61	if (val & O_NONBLOCK) {
89aa792b	62	debug2("fd %d is O_NONBLOCK", fd);
6d24277f	63	return;
a22aff1f	64	}
6d24277f	65	debug("fd %d setting O_NONBLOCK", fd);
	66	val \|= O_NONBLOCK;
	67	if (fcntl(fd, F_SETFL, val) == -1)
14a9a859	68	if (errno != ENODEV)
	69	error("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
	70	fd, strerror(errno));
6d24277f	71	}
6d24277f	72
89aa792b	73	void
	74	unset_nonblock(int fd)
	75	{
	76	int val;
	77
	78	val = fcntl(fd, F_GETFL, 0);
	79	if (val < 0) {
	80	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
	81	return;
	82	}
	83	if (!(val & O_NONBLOCK)) {
	84	debug2("fd %d is not O_NONBLOCK", fd);
	85	return;
	86	}
e04e7a19	87	debug("fd %d clearing O_NONBLOCK", fd);
89aa792b	88	val &= ~O_NONBLOCK;
	89	if (fcntl(fd, F_SETFL, val) == -1)
	90	if (errno != ENODEV)
	91	error("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
	92	fd, strerror(errno));
	93	}
	94
6d24277f	95	/* Characters considered whitespace in strsep calls. */
	96	#define WHITESPACE " \t\r\n"
	97
255cabd9	98	/* return next token in configuration line */
6d24277f	99	char *
	100	strdelim(char **s)
	101	{
	102	char *old;
	103	int wspace = 0;
	104
	105	if (*s == NULL)
	106	return NULL;
	107
	108	old = *s;
	109
	110	s = strpbrk(s, WHITESPACE "=");
	111	if (*s == NULL)
	112	return (old);
	113
	114	/* Allow only one '=' to be skipped */
	115	if (*s[0] == '=')
	116	wspace = 1;
	117	*s[0] = '\0';
	118
	119	s += strspn(s + 1, WHITESPACE) + 1;
	120	if (*s[0] == '=' && !wspace)
	121	s += strspn(s + 1, WHITESPACE) + 1;
	122
	123	return (old);
	124	}
1aa00dcb	125
3b1a83df	126	struct passwd *
	127	pwcopy(struct passwd *pw)
	128	{
	129	struct passwd copy = xmalloc(sizeof(copy));
5649fbbe	130
3b1a83df	131	memset(copy, 0, sizeof(*copy));
	132	copy->pw_name = xstrdup(pw->pw_name);
	133	copy->pw_passwd = xstrdup(pw->pw_passwd);
5649fbbe	134	copy->pw_gecos = xstrdup(pw->pw_gecos);
3b1a83df	135	copy->pw_uid = pw->pw_uid;
3b1a83df	136	copy->pw_gid = pw->pw_gid;
7751d4eb	137	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
c4d49b85	138	copy->pw_expire = pw->pw_expire;
7751d4eb	139	#endif
7751d4eb	140	#ifdef HAVE_PW_CHANGE_IN_PASSWD
c4d49b85	141	copy->pw_change = pw->pw_change;
7751d4eb	142	#endif
2605addd	143	#ifdef HAVE_PW_CLASS_IN_PASSWD
3b1a83df	144	copy->pw_class = xstrdup(pw->pw_class);
2605addd	145	#endif
3b1a83df	146	copy->pw_dir = xstrdup(pw->pw_dir);
	147	copy->pw_shell = xstrdup(pw->pw_shell);
	148	return copy;
	149	}
	150
255cabd9	151	/*
	152	* Convert ASCII string to TCP/IP port number.
	153	* Port must be >0 and <=65535.
	154	* Return 0 if invalid.
	155	*/
	156	int
	157	a2port(const char *s)
2d2a2c65	158	{
	159	long port;
	160	char *endp;
	161
	162	errno = 0;
	163	port = strtol(s, &endp, 0);
	164	if (s == endp \|\| *endp != '\0' \|\|
	165	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	166	port <= 0 \|\| port > 65535)
	167	return 0;
	168
	169	return port;
	170	}
	171
e2b1fb42	172	#define SECONDS 1
	173	#define MINUTES (SECONDS * 60)
	174	#define HOURS (MINUTES * 60)
	175	#define DAYS (HOURS * 24)
	176	#define WEEKS (DAYS * 7)
	177
255cabd9	178	/*
	179	* Convert a time string into seconds; format is
	180	* a sequence of:
	181	* time[qualifier]
	182	*
	183	* Valid time qualifiers are:
	184	* <none> seconds
	185	* s\|S seconds
	186	* m\|M minutes
	187	* h\|H hours
	188	* d\|D days
	189	* w\|W weeks
	190	*
	191	* Examples:
	192	* 90m 90 minutes
	193	* 1h30m 90 minutes
	194	* 2d 2 days
	195	* 1w 1 week
	196	*
	197	* Return -1 if time string is invalid.
	198	*/
	199	long
	200	convtime(const char *s)
e2b1fb42	201	{
	202	long total, secs;
	203	const char *p;
	204	char *endp;
	205
	206	errno = 0;
	207	total = 0;
	208	p = s;
	209
	210	if (p == NULL \|\| *p == '\0')
	211	return -1;
	212
	213	while (*p) {
	214	secs = strtol(p, &endp, 10);
	215	if (p == endp \|\|
	216	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
	217	secs < 0)
	218	return -1;
	219
	220	switch (*endp++) {
	221	case '\0':
	222	endp--;
	223	case 's':
	224	case 'S':
	225	break;
	226	case 'm':
	227	case 'M':
	228	secs *= MINUTES;
	229	break;
	230	case 'h':
	231	case 'H':
	232	secs *= HOURS;
	233	break;
	234	case 'd':
	235	case 'D':
	236	secs *= DAYS;
	237	break;
	238	case 'w':
	239	case 'W':
	240	secs *= WEEKS;
	241	break;
	242	default:
	243	return -1;
	244	}
	245	total += secs;
	246	if (total < 0)
	247	return -1;
	248	p = endp;
	249	}
	250
	251	return total;
	252	}
	253
1fcde3fe	254	char *
	255	cleanhostname(char *host)
	256	{
	257	if (*host == '[' && host[strlen(host) - 1] == ']') {
	258	host[strlen(host) - 1] = '\0';
	259	return (host + 1);
	260	} else
	261	return host;
	262	}
	263
	264	char *
	265	colon(char *cp)
	266	{
	267	int flag = 0;
	268
	269	if (cp == ':') / Leading colon is part of file name. */
	270	return (0);
	271	if (*cp == '[')
	272	flag = 1;
	273
	274	for (; *cp; ++cp) {
	275	if (cp == '@' && (cp+1) == '[')
	276	flag = 1;
	277	if (cp == ']' && (cp+1) == ':' && flag)
	278	return (cp+1);
	279	if (*cp == ':' && !flag)
	280	return (cp);
	281	if (*cp == '/')
	282	return (0);
	283	}
	284	return (0);
	285	}
	286
255cabd9	287	/* function to assist building execv() arguments */
8a624ebf	288	void
	289	addargs(arglist args, char fmt, ...)
	290	{
	291	va_list ap;
	292	char buf[1024];
	293
	294	va_start(ap, fmt);
	295	vsnprintf(buf, sizeof(buf), fmt, ap);
	296	va_end(ap);
	297
	298	if (args->list == NULL) {
	299	args->nalloc = 32;
	300	args->num = 0;
184eed6a	301	} else if (args->num+2 >= args->nalloc)
8a624ebf	302	args->nalloc *= 2;
	303
	304	args->list = xrealloc(args->list, args->nalloc * sizeof(char *));
	305	args->list[args->num++] = xstrdup(buf);
	306	args->list[args->num] = NULL;
	307	}
	308
1aa00dcb	309	mysig_t
	310	mysignal(int sig, mysig_t act)
	311	{
	312	#ifdef HAVE_SIGACTION
	313	struct sigaction sa, osa;
	314
120bf679	315	if (sigaction(sig, NULL, &osa) == -1)
1aa00dcb	316	return (mysig_t) -1;
1aa00dcb	317	if (osa.sa_handler != act) {
120bf679	318	memset(&sa, 0, sizeof(sa));
1aa00dcb	319	sigemptyset(&sa.sa_mask);
1aa00dcb	320	sa.sa_flags = 0;
d54d99a3	321	#if defined(SA_INTERRUPT)
d54d99a3	322	if (sig == SIGALRM)
df538d55	323	sa.sa_flags \|= SA_INTERRUPT;
25cd3375	324	#endif
1aa00dcb	325	sa.sa_handler = act;
120bf679	326	if (sigaction(sig, &sa, NULL) == -1)
1aa00dcb	327	return (mysig_t) -1;
	328	}
	329	return (osa.sa_handler);
	330	#else
	331	return (signal(sig, act));
	332	#endif
	333	}