- (dtucker) [openbsd-compat.c/pwcache.c] Pull in pwcache.c from OpenBSD (no

changes yet but there will be some to come).

ChangeLog

@@ -21,6 +21,8 @@
      inherited SIGTERM as ignored it will still be able to kill the ssh it
      starts.
      ok dtucker@
+ - (dtucker) [openbsd-compat.c/pwcache.c] Pull in pwcache.c from OpenBSD (no
+   changes yet but there will be some to come).
 
 20100114
  - (djm) [platform.h] Add missing prototype for

openbsd-compat/pwcache.c

@@ -0,0 +1,99 @@
+/*	$OpenBSD: pwcache.c,v 1.9 2005/08/08 08:05:34 espie Exp $ */
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <sys/types.h>
+
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+
+#define	NCACHE	64			/* power of 2 */
+#define	MASK	(NCACHE - 1)		/* bits to store with */
+
+char *
+user_from_uid(uid_t uid, int nouser)
+{
+	static struct ncache {
+		uid_t	uid;
+		char	name[_PW_NAME_LEN + 1];
+	} c_uid[NCACHE];
+	static int pwopen;
+	static char nbuf[15];		/* 32 bits == 10 digits */
+	struct passwd *pw;
+	struct ncache *cp;
+
+	cp = c_uid + (uid & MASK);
+	if (cp->uid != uid || !*cp->name) {
+		if (pwopen == 0) {
+			setpassent(1);
+			pwopen = 1;
+		}
+		if ((pw = getpwuid(uid)) == NULL) {
+			if (nouser)
+				return (NULL);
+			(void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
+			return (nbuf);
+		}
+		cp->uid = uid;
+		strlcpy(cp->name, pw->pw_name, sizeof(cp->name));
+	}
+	return (cp->name);
+}
+
+char *
+group_from_gid(gid_t gid, int nogroup)
+{
+	static struct ncache {
+		gid_t	gid;
+		char	name[_PW_NAME_LEN + 1];
+	} c_gid[NCACHE];
+	static int gropen;
+	static char nbuf[15];		/* 32 bits == 10 digits */
+	struct group *gr;
+	struct ncache *cp;
+
+	cp = c_gid + (gid & MASK);
+	if (cp->gid != gid || !*cp->name) {
+		if (gropen == 0) {
+			setgroupent(1);
+			gropen = 1;
+		}
+		if ((gr = getgrgid(gid)) == NULL) {
+			if (nogroup)
+				return (NULL);
+			(void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
+			return (nbuf);
+		}
+		cp->gid = gid;
+		strlcpy(cp->name, gr->gr_name, sizeof(cp->name));
+	}
+	return (cp->name);
+}