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

/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 * Copyright (c) 2005 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"
RCSID("$OpenBSD: misc.c,v 1.34 2005/07/08 09:26:18 dtucker 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"

/* 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;
}

/*
 * 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;
}

/*
 * 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) {
		(*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;
}

char *
tohex(const u_char *d, u_int l)
{
	char b[3], *r;
	u_int i, hl;

	hl = l * 2 + 1;
	r = xmalloc(hl);
	*r = '\0';
	for (i = 0; i < l; i++) {
		snprintf(b, sizeof(b), "%02x", d[i]);
		strlcat(r, b, hl);
	}
	return (r);
}
Commit	Line	Data
3c0ef626	1	/*
3c0ef626	2	* Copyright (c) 2000 Markus Friedl. All rights reserved.
2ce0bfe4	3	* Copyright (c) 2005 Damien Miller. All rights reserved.
3c0ef626	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "includes.h"
2ce0bfe4	27	RCSID("$OpenBSD: misc.c,v 1.34 2005/07/08 09:26:18 dtucker Exp $");
3c0ef626	28
	29	#include "misc.h"
	30	#include "log.h"
	31	#include "xmalloc.h"
	32
	33	/* remove newline at end of string */
	34	char *
	35	chop(char *s)
	36	{
	37	char *t = s;
	38	while (*t) {
75be3237	39	if (t == '\n' \|\| t == '\r') {
3c0ef626	40	*t = '\0';
	41	return s;
	42	}
	43	t++;
	44	}
	45	return s;
	46
	47	}
	48
	49	/* set/unset filedescriptor to non-blocking */
7e82606e	50	int
3c0ef626	51	set_nonblock(int fd)
	52	{
	53	int val;
	54
	55	val = fcntl(fd, F_GETFL, 0);
	56	if (val < 0) {
	57	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
7e82606e	58	return (-1);
3c0ef626	59	}
3c0ef626	60	if (val & O_NONBLOCK) {
7e82606e	61	debug3("fd %d is O_NONBLOCK", fd);
7e82606e	62	return (0);
3c0ef626	63	}
7cac2b65	64	debug2("fd %d setting O_NONBLOCK", fd);
3c0ef626	65	val \|= O_NONBLOCK;
7e82606e	66	if (fcntl(fd, F_SETFL, val) == -1) {
	67	debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
	68	strerror(errno));
	69	return (-1);
	70	}
	71	return (0);
3c0ef626	72	}
3c0ef626	73
7e82606e	74	int
3c0ef626	75	unset_nonblock(int fd)
	76	{
	77	int val;
	78
	79	val = fcntl(fd, F_GETFL, 0);
	80	if (val < 0) {
	81	error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
7e82606e	82	return (-1);
3c0ef626	83	}
3c0ef626	84	if (!(val & O_NONBLOCK)) {
7e82606e	85	debug3("fd %d is not O_NONBLOCK", fd);
7e82606e	86	return (0);
3c0ef626	87	}
	88	debug("fd %d clearing O_NONBLOCK", fd);
	89	val &= ~O_NONBLOCK;
7e82606e	90	if (fcntl(fd, F_SETFL, val) == -1) {
7e82606e	91	debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
75be3237	92	fd, strerror(errno));
7e82606e	93	return (-1);
	94	}
	95	return (0);
75be3237	96	}
	97
	98	/* disable nagle on socket */
	99	void
	100	set_nodelay(int fd)
	101	{
	102	int opt;
	103	socklen_t optlen;
	104
	105	optlen = sizeof opt;
	106	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
540d72c3	107	debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
75be3237	108	return;
	109	}
	110	if (opt == 1) {
	111	debug2("fd %d is TCP_NODELAY", fd);
	112	return;
	113	}
	114	opt = 1;
	115	debug2("fd %d setting TCP_NODELAY", fd);
	116	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
	117	error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
3c0ef626	118	}
	119
	120	/* Characters considered whitespace in strsep calls. */
	121	#define WHITESPACE " \t\r\n"
	122
75be3237	123	/* Characters considered as quotations. */
	124	#define QUOTES "'\""
	125
3c0ef626	126	/* return next token in configuration line */
	127	char *
	128	strdelim(char **s)
	129	{
75be3237	130	char old, p, *q;
3c0ef626	131	int wspace = 0;
	132
	133	if (*s == NULL)
	134	return NULL;
	135
	136	old = *s;
	137
75be3237	138	if ((q=strchr(QUOTES, (int) old)) && q)
	139	{
	140	/* find next quote character, point old to start of quoted
	141	* string */
	142	for (p = ++old;p && p!=*q; p++)
	143	;
	144
	145	/* find start of next token */
	146	s = (p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL;
	147
	148	/* terminate 'old' token */
	149	*p = '\0';
	150	return (old);
	151	}
	152
	153	s = strpbrk(s, WHITESPACE "=");
3c0ef626	154	if (*s == NULL)
	155	return (old);
	156
	157	/* Allow only one '=' to be skipped */
	158	if (*s[0] == '=')
	159	wspace = 1;
	160	*s[0] = '\0';
	161
	162	s += strspn(s + 1, WHITESPACE) + 1;
	163	if (*s[0] == '=' && !wspace)
	164	s += strspn(s + 1, WHITESPACE) + 1;
	165
	166	return (old);
	167	}
	168
	169	struct passwd *
	170	pwcopy(struct passwd *pw)
	171	{
	172	struct passwd copy = xmalloc(sizeof(copy));
	173
	174	memset(copy, 0, sizeof(*copy));
	175	copy->pw_name = xstrdup(pw->pw_name);
	176	copy->pw_passwd = xstrdup(pw->pw_passwd);
	177	copy->pw_gecos = xstrdup(pw->pw_gecos);
	178	copy->pw_uid = pw->pw_uid;
	179	copy->pw_gid = pw->pw_gid;
	180	#ifdef HAVE_PW_EXPIRE_IN_PASSWD
	181	copy->pw_expire = pw->pw_expire;
	182	#endif
	183	#ifdef HAVE_PW_CHANGE_IN_PASSWD
	184	copy->pw_change = pw->pw_change;
	185	#endif
	186	#ifdef HAVE_PW_CLASS_IN_PASSWD
	187	copy->pw_class = xstrdup(pw->pw_class);
	188	#endif
	189	copy->pw_dir = xstrdup(pw->pw_dir);
	190	copy->pw_shell = xstrdup(pw->pw_shell);
	191	return copy;
	192	}
	193
	194	/*
	195	* Convert ASCII string to TCP/IP port number.
	196	* Port must be >0 and <=65535.
	197	* Return 0 if invalid.
	198	*/
	199	int
	200	a2port(const char *s)
	201	{
	202	long port;
	203	char *endp;
	204
	205	errno = 0;
	206	port = strtol(s, &endp, 0);
	207	if (s == endp \|\| *endp != '\0' \|\|
	208	(errno == ERANGE && (port == LONG_MIN \|\| port == LONG_MAX)) \|\|
	209	port <= 0 \|\| port > 65535)
	210	return 0;
	211
	212	return port;
	213	}
	214
	215	#define SECONDS 1
	216	#define MINUTES (SECONDS * 60)
	217	#define HOURS (MINUTES * 60)
218	#define DAYS (HOURS * 24)
219	#define WEEKS (DAYS * 7)
220
221	/*
222	* Convert a time string into seconds; format is
223	* a sequence of:
224	* time[qualifier]
225	*
226	* Valid time qualifiers are:
227	* <none> seconds
228	* s\|S seconds
229	* m\|M minutes
230	* h\|H hours
231	* d\|D days
232	* w\|W weeks
233	*
234	* Examples:
235	* 90m 90 minutes
236	* 1h30m 90 minutes
237	* 2d 2 days
238	* 1w 1 week
239	*
240	* Return -1 if time string is invalid.
241	*/
242	long
243	convtime(const char *s)
244	{
245	long total, secs;
246	const char *p;
247	char *endp;
248
249	errno = 0;
250	total = 0;
251	p = s;
252
253	if (p == NULL \|\| *p == '\0')
254	return -1;
255
256	while (*p) {
257	secs = strtol(p, &endp, 10);
258	if (p == endp \|\|
259	(errno == ERANGE && (secs == LONG_MIN \|\| secs == LONG_MAX)) \|\|
260	secs < 0)
261	return -1;
262
263	switch (*endp++) {
264	case '\0':
265	endp--;
266	case 's':
267	case 'S':
268	break;
269	case 'm':
270	case 'M':
271	secs *= MINUTES;
272	break;
273	case 'h':
274	case 'H':
275	secs *= HOURS;
276	break;
277	case 'd':
278	case 'D':
279	secs *= DAYS;
280	break;
281	case 'w':
282	case 'W':
283	secs *= WEEKS;
284	break;
285	default:
286	return -1;
287	}
288	total += secs;
289	if (total < 0)
290	return -1;
291	p = endp;
292	}
293
294	return total;
295	}
296
dfddba3d	297	/*
	298	* Search for next delimiter between hostnames/addresses and ports.
	299	* Argument may be modified (for termination).
	300	* Returns *cp if parsing succeeds.
	301	* *cp is set to the start of the next delimiter, if one was found.
	302	* If this is the last field, *cp is set to NULL.
	303	*/
	304	char *
	305	hpdelim(char **cp)
	306	{
	307	char s, old;
	308
	309	if (cp == NULL \|\| *cp == NULL)
	310	return NULL;
	311
	312	old = s = *cp;
	313	if (*s == '[') {
	314	if ((s = strchr(s, ']')) == NULL)
	315	return NULL;
	316	else
	317	s++;
	318	} else if ((s = strpbrk(s, ":/")) == NULL)
	319	s = cp + strlen(cp); /* skip to end (see first case below) */
	320
	321	switch (*s) {
	322	case '\0':
	323	cp = NULL; / no more fields*/
	324	break;
8b32eddc	325
dfddba3d	326	case ':':
	327	case '/':
	328	s = '\0'; / terminate */
	329	*cp = s + 1;
	330	break;
8b32eddc	331
dfddba3d	332	default:
	333	return NULL;
	334	}
	335
	336	return old;
	337	}
	338
3c0ef626	339	char *
	340	cleanhostname(char *host)
	341	{
	342	if (*host == '[' && host[strlen(host) - 1] == ']') {
	343	host[strlen(host) - 1] = '\0';
	344	return (host + 1);
	345	} else
	346	return host;
	347	}
	348
	349	char *
	350	colon(char *cp)
	351	{
	352	int flag = 0;
	353
	354	if (cp == ':') / Leading colon is part of file name. */
	355	return (0);
	356	if (*cp == '[')
	357	flag = 1;
	358
	359	for (; *cp; ++cp) {
	360	if (cp == '@' && (cp+1) == '[')
	361	flag = 1;
	362	if (cp == ']' && (cp+1) == ':' && flag)
	363	return (cp+1);
	364	if (*cp == ':' && !flag)
	365	return (cp);
	366	if (*cp == '/')
	367	return (0);
	368	}
	369	return (0);
	370	}
	371
	372	/* function to assist building execv() arguments */
	373	void
	374	addargs(arglist args, char fmt, ...)
	375	{
	376	va_list ap;
	377	char buf[1024];
7e82606e	378	u_int nalloc;
3c0ef626	379
	380	va_start(ap, fmt);
	381	vsnprintf(buf, sizeof(buf), fmt, ap);
	382	va_end(ap);
	383
29d88157	384	nalloc = args->nalloc;
3c0ef626	385	if (args->list == NULL) {
29d88157	386	nalloc = 32;
3c0ef626	387	args->num = 0;
29d88157	388	} else if (args->num+2 >= nalloc)
29d88157	389	nalloc *= 2;
3c0ef626	390
29d88157	391	args->list = xrealloc(args->list, nalloc * sizeof(char *));
29d88157	392	args->nalloc = nalloc;
3c0ef626	393	args->list[args->num++] = xstrdup(buf);
	394	args->list[args->num] = NULL;
	395	}
dfddba3d	396
2ce0bfe4	397	/*
	398	* Expands tildes in the file name. Returns data allocated by xmalloc.
	399	* Warning: this calls getpw*.
	400	*/
	401	char *
	402	tilde_expand_filename(const char *filename, uid_t uid)
	403	{
	404	const char *path;
	405	char user[128], ret[MAXPATHLEN];
	406	struct passwd *pw;
	407	u_int len, slash;
	408
	409	if (*filename != '~')
	410	return (xstrdup(filename));
	411	filename++;
	412
	413	path = strchr(filename, '/');
	414	if (path != NULL && path > filename) { /* ~user/path */
	415	slash = path - filename;
	416	if (slash > sizeof(user) - 1)
	417	fatal("tilde_expand_filename: ~username too long");
	418	memcpy(user, filename, slash);
	419	user[slash] = '\0';
	420	if ((pw = getpwnam(user)) == NULL)
	421	fatal("tilde_expand_filename: No such user %s", user);
	422	} else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
	423	fatal("tilde_expand_filename: No such uid %d", uid);
	424
	425	if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
	426	fatal("tilde_expand_filename: Path too long");
	427
	428	/* Make sure directory has a trailing '/' */
	429	len = strlen(pw->pw_dir);
	430	if ((len == 0 \|\| pw->pw_dir[len - 1] != '/') &&
	431	strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
	432	fatal("tilde_expand_filename: Path too long");
	433
	434	/* Skip leading '/' from specified path */
	435	if (path != NULL)
	436	filename = path + 1;
	437	if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
	438	fatal("tilde_expand_filename: Path too long");
	439
	440	return (xstrdup(ret));
	441	}
	442
	443	/*
	444	* Expand a string with a set of %[char] escapes. A number of escapes may be
	445	* specified as (char escape_chars, char replacement) pairs. The list must
	446	* be terminated by a NULL escape_char. Returns replaced string in memory
	447	* allocated by xmalloc.
	448	*/
	449	char *
	450	percent_expand(const char *string, ...)
	451	{
	452	#define EXPAND_MAX_KEYS 16
	453	struct {
	454	const char *key;
	455	const char *repl;
	456	} keys[EXPAND_MAX_KEYS];
	457	u_int num_keys, i, j;
	458	char buf[4096];
	459	va_list ap;
	460
461	/* Gather keys */
462	va_start(ap, string);
463	for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
464	keys[num_keys].key = va_arg(ap, char *);
465	if (keys[num_keys].key == NULL)
466	break;
467	keys[num_keys].repl = va_arg(ap, char *);
468	if (keys[num_keys].repl == NULL)
469	fatal("percent_expand: NULL replacement");
470	}
471	va_end(ap);
472
473	if (num_keys >= EXPAND_MAX_KEYS)
474	fatal("percent_expand: too many keys");
475
476	/* Expand string */
477	*buf = '\0';
478	for (i = 0; *string != '\0'; string++) {
479	if (*string != '%') {
480	append:
481	buf[i++] = *string;
482	if (i >= sizeof(buf))
483	fatal("percent_expand: string too long");
484	buf[i] = '\0';
485	continue;
486	}
487	string++;
488	if (*string == '%')
489	goto append;
490	for (j = 0; j < num_keys; j++) {
491	if (strchr(keys[j].key, *string) != NULL) {
492	i = strlcat(buf, keys[j].repl, sizeof(buf));
493	if (i >= sizeof(buf))
494	fatal("percent_expand: string too long");
495	break;
496	}
497	}
498	if (j >= num_keys)
499	fatal("percent_expand: unknown key %%%c", *string);
500	}
501	return (xstrdup(buf));
502	#undef EXPAND_MAX_KEYS
503	}
504
dfddba3d	505	/*
	506	* Read an entire line from a public key file into a static buffer, discarding
	507	* lines that exceed the buffer size. Returns 0 on success, -1 on failure.
	508	*/
	509	int
	510	read_keyfile_line(FILE f, const char filename, char *buf, size_t bufsz,
	511	u_long *lineno)
	512	{
	513	while (fgets(buf, bufsz, f) != NULL) {
	514	(*lineno)++;
	515	if (buf[strlen(buf) - 1] == '\n' \|\| feof(f)) {
	516	return 0;
	517	} else {
	518	debug("%s: %s line %lu exceeds size limit", __func__,
	519	filename, *lineno);
	520	/* discard remainder of line */
8b32eddc	521	while (fgetc(f) != '\n' && !feof(f))
dfddba3d	522	; /* nothing */
	523	}
	524	}
	525	return -1;
	526	}
2ce0bfe4	527
	528	char *
	529	tohex(const u_char *d, u_int l)
	530	{
	531	char b[3], *r;
	532	u_int i, hl;
	533
	534	hl = l * 2 + 1;
	535	r = xmalloc(hl);
	536	*r = '\0';
	537	for (i = 0; i < l; i++) {
	538	snprintf(b, sizeof(b), "%02x", d[i]);
	539	strlcat(r, b, hl);
	540	}
	541	return (r);
	542	}
	543