[openssh.git] / misc.c

/*	$OpenBSD: misc.c,v 1.11 2001/06/16 08:58:34 markus 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 1.11 2001/06/16 08:58:34 markus Exp $");

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

char *
chop(char *s)
{
	char *t = s;
	while (*t) {
		if(*t == '\n' || *t == '\r') {
			*t = '\0';
			return s;
		}
		t++;
	}
	return s;

}

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"

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;
}

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)

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);
}

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
c4d49b85	1	/* $OpenBSD: misc.c,v 1.11 2001/06/16 08:58:34 markus 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"
c4d49b85	28	RCSID("$OpenBSD: misc.c,v 1.11 2001/06/16 08:58:34 markus Exp $");
6d24277f	29
1aa00dcb	30	#include "misc.h"
42f11eb2	31	#include "log.h"
4ab21f86	32	#include "xmalloc.h"
6d24277f	33
	34	char *
	35	chop(char *s)
	36	{
	37	char *t = s;
	38	while (*t) {
	39	if(t == '\n' \|\| t == '\r') {
	40	*t = '\0';
	41	return s;
	42	}
	43	t++;
	44	}
	45	return s;
	46
	47	}
	48
	49	void
	50	set_nonblock(int fd)
	51	{
	52	int val;
89aa792b	53
6d24277f	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	}
a22aff1f	59	if (val & O_NONBLOCK) {
89aa792b	60	debug2("fd %d is O_NONBLOCK", fd);
6d24277f	61	return;
a22aff1f	62	}
6d24277f	63	debug("fd %d setting O_NONBLOCK", fd);
	64	val \|= O_NONBLOCK;
	65	if (fcntl(fd, F_SETFL, val) == -1)
14a9a859	66	if (errno != ENODEV)
	67	error("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
	68	fd, strerror(errno));
6d24277f	69	}
6d24277f	70
89aa792b	71	void
	72	unset_nonblock(int fd)
	73	{
	74	int val;
	75
	76	val = fcntl(fd, F_GETFL, 0);
	77	if (val < 0) {
	78	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
	79	return;
	80	}
	81	if (!(val & O_NONBLOCK)) {
	82	debug2("fd %d is not O_NONBLOCK", fd);
	83	return;
	84	}
e04e7a19	85	debug("fd %d clearing O_NONBLOCK", fd);
89aa792b	86	val &= ~O_NONBLOCK;
	87	if (fcntl(fd, F_SETFL, val) == -1)
	88	if (errno != ENODEV)
	89	error("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
	90	fd, strerror(errno));
	91	}
	92
6d24277f	93	/* Characters considered whitespace in strsep calls. */
	94	#define WHITESPACE " \t\r\n"
	95
	96	char *
	97	strdelim(char **s)
	98	{
	99	char *old;
	100	int wspace = 0;
	101
	102	if (*s == NULL)
	103	return NULL;
	104
	105	old = *s;
	106
	107	s = strpbrk(s, WHITESPACE "=");
	108	if (*s == NULL)
	109	return (old);
	110
	111	/* Allow only one '=' to be skipped */
	112	if (*s[0] == '=')
	113	wspace = 1;
	114	*s[0] = '\0';
	115
	116	s += strspn(s + 1, WHITESPACE) + 1;
	117	if (*s[0] == '=' && !wspace)
	118	s += strspn(s + 1, WHITESPACE) + 1;
	119
	120	return (old);
	121	}
1aa00dcb	122
3b1a83df	123	struct passwd *
	124	pwcopy(struct passwd *pw)
	125	{
	126	struct passwd copy = xmalloc(sizeof(copy));
5649fbbe	127
3b1a83df	128	memset(copy, 0, sizeof(*copy));
	129	copy->pw_name = xstrdup(pw->pw_name);
	130	copy->pw_passwd = xstrdup(pw->pw_passwd);
5649fbbe	131	copy->pw_gecos = xstrdup(pw->pw_gecos);
3b1a83df	132	copy->pw_uid = pw->pw_uid;
3b1a83df	133	copy->pw_gid = pw->pw_gid;
7751d4eb	134	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
c4d49b85	135	copy->pw_expire = pw->pw_expire;
7751d4eb	136	#endif
7751d4eb	137	#ifdef HAVE_PW_CHANGE_IN_PASSWD
c4d49b85	138	copy->pw_change = pw->pw_change;
7751d4eb	139	#endif
2605addd	140	#ifdef HAVE_PW_CLASS_IN_PASSWD
3b1a83df	141	copy->pw_class = xstrdup(pw->pw_class);
2605addd	142	#endif
3b1a83df	143	copy->pw_dir = xstrdup(pw->pw_dir);
	144	copy->pw_shell = xstrdup(pw->pw_shell);
	145	return copy;
	146	}
	147
2d2a2c65	148	int a2port(const char *s)
	149	{
	150	long port;
	151	char *endp;
	152
	153	errno = 0;
	154	port = strtol(s, &endp, 0);
	155	if (s == endp \|\| *endp != '\0' \|\|
	156	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	157	port <= 0 \|\| port > 65535)
	158	return 0;
	159
	160	return port;
	161	}
	162
e2b1fb42	163	#define SECONDS 1
	164	#define MINUTES (SECONDS * 60)
	165	#define HOURS (MINUTES * 60)
	166	#define DAYS (HOURS * 24)
	167	#define WEEKS (DAYS * 7)
	168
	169	long convtime(const char *s)
	170	{
	171	long total, secs;
	172	const char *p;
	173	char *endp;
	174
	175	errno = 0;
	176	total = 0;
	177	p = s;
	178
	179	if (p == NULL \|\| *p == '\0')
	180	return -1;
	181
	182	while (*p) {
	183	secs = strtol(p, &endp, 10);
	184	if (p == endp \|\|
	185	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
	186	secs < 0)
	187	return -1;
	188
	189	switch (*endp++) {
	190	case '\0':
	191	endp--;
	192	case 's':
	193	case 'S':
	194	break;
	195	case 'm':
	196	case 'M':
	197	secs *= MINUTES;
	198	break;
	199	case 'h':
	200	case 'H':
	201	secs *= HOURS;
	202	break;
	203	case 'd':
	204	case 'D':
	205	secs *= DAYS;
	206	break;
	207	case 'w':
	208	case 'W':
	209	secs *= WEEKS;
	210	break;
	211	default:
	212	return -1;
	213	}
	214	total += secs;
	215	if (total < 0)
	216	return -1;
	217	p = endp;
	218	}
	219
	220	return total;
	221	}
	222
1fcde3fe	223	char *
	224	cleanhostname(char *host)
	225	{
	226	if (*host == '[' && host[strlen(host) - 1] == ']') {
	227	host[strlen(host) - 1] = '\0';
	228	return (host + 1);
	229	} else
	230	return host;
	231	}
	232
	233	char *
	234	colon(char *cp)
	235	{
	236	int flag = 0;
	237
	238	if (cp == ':') / Leading colon is part of file name. */
	239	return (0);
	240	if (*cp == '[')
	241	flag = 1;
	242
	243	for (; *cp; ++cp) {
	244	if (cp == '@' && (cp+1) == '[')
	245	flag = 1;
	246	if (cp == ']' && (cp+1) == ':' && flag)
	247	return (cp+1);
	248	if (*cp == ':' && !flag)
	249	return (cp);
	250	if (*cp == '/')
	251	return (0);
	252	}
	253	return (0);
	254	}
	255
8a624ebf	256	void
	257	addargs(arglist args, char fmt, ...)
	258	{
	259	va_list ap;
	260	char buf[1024];
	261
	262	va_start(ap, fmt);
	263	vsnprintf(buf, sizeof(buf), fmt, ap);
	264	va_end(ap);
	265
	266	if (args->list == NULL) {
	267	args->nalloc = 32;
	268	args->num = 0;
	269	} else if (args->num+2 >= args->nalloc)
	270	args->nalloc *= 2;
	271
	272	args->list = xrealloc(args->list, args->nalloc * sizeof(char *));
	273	args->list[args->num++] = xstrdup(buf);
	274	args->list[args->num] = NULL;
	275	}
	276
1aa00dcb	277	mysig_t
	278	mysignal(int sig, mysig_t act)
	279	{
	280	#ifdef HAVE_SIGACTION
	281	struct sigaction sa, osa;
	282
120bf679	283	if (sigaction(sig, NULL, &osa) == -1)
1aa00dcb	284	return (mysig_t) -1;
1aa00dcb	285	if (osa.sa_handler != act) {
120bf679	286	memset(&sa, 0, sizeof(sa));
1aa00dcb	287	sigemptyset(&sa.sa_mask);
1aa00dcb	288	sa.sa_flags = 0;
d54d99a3	289	#if defined(SA_INTERRUPT)
d54d99a3	290	if (sig == SIGALRM)
df538d55	291	sa.sa_flags \|= SA_INTERRUPT;
25cd3375	292	#endif
1aa00dcb	293	sa.sa_handler = act;
120bf679	294	if (sigaction(sig, &sa, NULL) == -1)
1aa00dcb	295	return (mysig_t) -1;
	296	}
	297	return (osa.sa_handler);
	298	#else
	299	return (signal(sig, act));
	300	#endif
	301	}