[openssh.git] / 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 1.29 2005/03/10 22:01:05 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 */
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"

/* 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;
}

/*
 * 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 buf[1024];
	u_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;
}

/*
 * 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;
}
Commit	Line	Data
bcbf86ec	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
6d24277f	25	#include "includes.h"
f8cc7664	26	RCSID("$OpenBSD: misc.c,v 1.29 2005/03/10 22:01:05 deraadt Exp $");
6d24277f	27
1aa00dcb	28	#include "misc.h"
42f11eb2	29	#include "log.h"
4ab21f86	30	#include "xmalloc.h"
6d24277f	31
255cabd9	32	/* remove newline at end of string */
6d24277f	33	char *
	34	chop(char *s)
	35	{
	36	char *t = s;
	37	while (*t) {
6aacefa7	38	if (t == '\n' \|\| t == '\r') {
6d24277f	39	*t = '\0';
	40	return s;
	41	}
	42	t++;
	43	}
	44	return s;
	45
	46	}
	47
255cabd9	48	/* set/unset filedescriptor to non-blocking */
170694d7	49	int
6d24277f	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));
170694d7	57	return (-1);
6d24277f	58	}
a22aff1f	59	if (val & O_NONBLOCK) {
170694d7	60	debug3("fd %d is O_NONBLOCK", fd);
170694d7	61	return (0);
a22aff1f	62	}
45c42d58	63	debug2("fd %d setting O_NONBLOCK", fd);
6d24277f	64	val \|= O_NONBLOCK;
170694d7	65	if (fcntl(fd, F_SETFL, val) == -1) {
	66	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
	67	strerror(errno));
	68	return (-1);
	69	}
	70	return (0);
6d24277f	71	}
6d24277f	72
170694d7	73	int
89aa792b	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));
170694d7	81	return (-1);
89aa792b	82	}
89aa792b	83	if (!(val & O_NONBLOCK)) {
170694d7	84	debug3("fd %d is not O_NONBLOCK", fd);
170694d7	85	return (0);
89aa792b	86	}
e04e7a19	87	debug("fd %d clearing O_NONBLOCK", fd);
89aa792b	88	val &= ~O_NONBLOCK;
170694d7	89	if (fcntl(fd, F_SETFL, val) == -1) {
170694d7	90	debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
c92ec40b	91	fd, strerror(errno));
170694d7	92	return (-1);
	93	}
	94	return (0);
89aa792b	95	}
89aa792b	96
bcc0381e	97	/* disable nagle on socket */
	98	void
	99	set_nodelay(int fd)
	100	{
3c05447a	101	int opt;
3c05447a	102	socklen_t optlen;
bcc0381e	103
811a6342	104	optlen = sizeof opt;
811a6342	105	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
f7fb35fe	106	debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
811a6342	107	return;
	108	}
	109	if (opt == 1) {
	110	debug2("fd %d is TCP_NODELAY", fd);
	111	return;
	112	}
	113	opt = 1;
6226a8f8	114	debug2("fd %d setting TCP_NODELAY", fd);
811a6342	115	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
bcc0381e	116	error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
	117	}
	118
6d24277f	119	/* Characters considered whitespace in strsep calls. */
	120	#define WHITESPACE " \t\r\n"
	121
255cabd9	122	/* return next token in configuration line */
6d24277f	123	char *
	124	strdelim(char **s)
	125	{
	126	char *old;
	127	int wspace = 0;
	128
	129	if (*s == NULL)
	130	return NULL;
	131
	132	old = *s;
	133
	134	s = strpbrk(s, WHITESPACE "=");
	135	if (*s == NULL)
	136	return (old);
	137
	138	/* Allow only one '=' to be skipped */
	139	if (*s[0] == '=')
	140	wspace = 1;
	141	*s[0] = '\0';
	142
	143	s += strspn(s + 1, WHITESPACE) + 1;
	144	if (*s[0] == '=' && !wspace)
	145	s += strspn(s + 1, WHITESPACE) + 1;
	146
	147	return (old);
	148	}
1aa00dcb	149
3b1a83df	150	struct passwd *
	151	pwcopy(struct passwd *pw)
	152	{
	153	struct passwd copy = xmalloc(sizeof(copy));
5649fbbe	154
3b1a83df	155	memset(copy, 0, sizeof(*copy));
	156	copy->pw_name = xstrdup(pw->pw_name);
	157	copy->pw_passwd = xstrdup(pw->pw_passwd);
5649fbbe	158	copy->pw_gecos = xstrdup(pw->pw_gecos);
3b1a83df	159	copy->pw_uid = pw->pw_uid;
3b1a83df	160	copy->pw_gid = pw->pw_gid;
7751d4eb	161	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
c4d49b85	162	copy->pw_expire = pw->pw_expire;
7751d4eb	163	#endif
7751d4eb	164	#ifdef HAVE_PW_CHANGE_IN_PASSWD
c4d49b85	165	copy->pw_change = pw->pw_change;
7751d4eb	166	#endif
2605addd	167	#ifdef HAVE_PW_CLASS_IN_PASSWD
3b1a83df	168	copy->pw_class = xstrdup(pw->pw_class);
2605addd	169	#endif
3b1a83df	170	copy->pw_dir = xstrdup(pw->pw_dir);
	171	copy->pw_shell = xstrdup(pw->pw_shell);
	172	return copy;
	173	}
	174
255cabd9	175	/*
	176	* Convert ASCII string to TCP/IP port number.
	177	* Port must be >0 and <=65535.
	178	* Return 0 if invalid.
	179	*/
	180	int
	181	a2port(const char *s)
2d2a2c65	182	{
	183	long port;
	184	char *endp;
	185
	186	errno = 0;
	187	port = strtol(s, &endp, 0);
	188	if (s == endp \|\| *endp != '\0' \|\|
	189	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	190	port <= 0 \|\| port > 65535)
	191	return 0;
	192
	193	return port;
	194	}
	195
e2b1fb42	196	#define SECONDS 1
	197	#define MINUTES (SECONDS * 60)
	198	#define HOURS (MINUTES * 60)
	199	#define DAYS (HOURS * 24)
	200	#define WEEKS (DAYS * 7)
	201
255cabd9	202	/*
	203	* Convert a time string into seconds; format is
	204	* a sequence of:
	205	* time[qualifier]
	206	*
	207	* Valid time qualifiers are:
	208	* <none> seconds
	209	* s\|S seconds
	210	* m\|M minutes
	211	* h\|H hours
	212	* d\|D days
	213	* w\|W weeks
	214	*
	215	* Examples:
	216	* 90m 90 minutes
	217	* 1h30m 90 minutes
	218	* 2d 2 days
	219	* 1w 1 week
	220	*
	221	* Return -1 if time string is invalid.
	222	*/
	223	long
	224	convtime(const char *s)
e2b1fb42	225	{
	226	long total, secs;
	227	const char *p;
	228	char *endp;
	229
	230	errno = 0;
	231	total = 0;
	232	p = s;
	233
	234	if (p == NULL \|\| *p == '\0')
	235	return -1;
	236
	237	while (*p) {
	238	secs = strtol(p, &endp, 10);
	239	if (p == endp \|\|
	240	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
	241	secs < 0)
	242	return -1;
	243
	244	switch (*endp++) {
	245	case '\0':
	246	endp--;
	247	case 's':
	248	case 'S':
	249	break;
	250	case 'm':
	251	case 'M':
	252	secs *= MINUTES;
	253	break;
	254	case 'h':
	255	case 'H':
	256	secs *= HOURS;
	257	break;
	258	case 'd':
	259	case 'D':
	260	secs *= DAYS;
	261	break;
	262	case 'w':
	263	case 'W':
	264	secs *= WEEKS;
	265	break;
	266	default:
	267	return -1;
	268	}
	269	total += secs;
	270	if (total < 0)
	271	return -1;
	272	p = endp;
	273	}
	274
	275	return total;
	276	}
	277
3867aa0a	278	/*
	279	* Search for next delimiter between hostnames/addresses and ports.
	280	* Argument may be modified (for termination).
	281	* Returns *cp if parsing succeeds.
	282	* *cp is set to the start of the next delimiter, if one was found.
	283	* If this is the last field, *cp is set to NULL.
	284	*/
	285	char *
	286	hpdelim(char **cp)
	287	{
	288	char s, old;
	289
	290	if (cp == NULL \|\| *cp == NULL)
	291	return NULL;
	292
	293	old = s = *cp;
	294	if (*s == '[') {
	295	if ((s = strchr(s, ']')) == NULL)
	296	return NULL;
	297	else
	298	s++;
	299	} else if ((s = strpbrk(s, ":/")) == NULL)
	300	s = cp + strlen(cp); /* skip to end (see first case below) */
	301
	302	switch (*s) {
	303	case '\0':
	304	cp = NULL; / no more fields*/
	305	break;
f8cc7664	306
3867aa0a	307	case ':':
	308	case '/':
	309	s = '\0'; / terminate */
	310	*cp = s + 1;
	311	break;
f8cc7664	312
3867aa0a	313	default:
	314	return NULL;
	315	}
	316
	317	return old;
	318	}
	319
1fcde3fe	320	char *
	321	cleanhostname(char *host)
	322	{
	323	if (*host == '[' && host[strlen(host) - 1] == ']') {
	324	host[strlen(host) - 1] = '\0';
	325	return (host + 1);
	326	} else
	327	return host;
	328	}
	329
	330	char *
	331	colon(char *cp)
	332	{
	333	int flag = 0;
	334
	335	if (cp == ':') / Leading colon is part of file name. */
	336	return (0);
	337	if (*cp == '[')
	338	flag = 1;
	339
	340	for (; *cp; ++cp) {
	341	if (cp == '@' && (cp+1) == '[')
	342	flag = 1;
	343	if (cp == ']' && (cp+1) == ':' && flag)
	344	return (cp+1);
	345	if (*cp == ':' && !flag)
	346	return (cp);
	347	if (*cp == '/')
	348	return (0);
	349	}
	350	return (0);
	351	}
	352
255cabd9	353	/* function to assist building execv() arguments */
8a624ebf	354	void
	355	addargs(arglist args, char fmt, ...)
	356	{
	357	va_list ap;
	358	char buf[1024];
9a995072	359	u_int nalloc;
8a624ebf	360
	361	va_start(ap, fmt);
	362	vsnprintf(buf, sizeof(buf), fmt, ap);
	363	va_end(ap);
	364
c46e584f	365	nalloc = args->nalloc;
8a624ebf	366	if (args->list == NULL) {
c46e584f	367	nalloc = 32;
8a624ebf	368	args->num = 0;
c46e584f	369	} else if (args->num+2 >= nalloc)
c46e584f	370	nalloc *= 2;
8a624ebf	371
c46e584f	372	args->list = xrealloc(args->list, nalloc * sizeof(char *));
c46e584f	373	args->nalloc = nalloc;
8a624ebf	374	args->list[args->num++] = xstrdup(buf);
	375	args->list[args->num] = NULL;
	376	}
ea067773	377
	378	/*
	379	* Read an entire line from a public key file into a static buffer, discarding
	380	* lines that exceed the buffer size. Returns 0 on success, -1 on failure.
	381	*/
	382	int
	383	read_keyfile_line(FILE f, const char filename, char *buf, size_t bufsz,
41feb690	384	u_long *lineno)
ea067773	385	{
	386	while (fgets(buf, bufsz, f) != NULL) {
	387	(*lineno)++;
	388	if (buf[strlen(buf) - 1] == '\n' \|\| feof(f)) {
	389	return 0;
	390	} else {
41feb690	391	debug("%s: %s line %lu exceeds size limit", __func__,
41feb690	392	filename, *lineno);
ea067773	393	/* discard remainder of line */
f8cc7664	394	while (fgetc(f) != '\n' && !feof(f))
ea067773	395	; /* nothing */
	396	}
	397	}
	398	return -1;
	399	}