BSD 4.4 Lite Lib Sources

1 files changed, 201 insertions, 0 deletions

diff --git a/lib/libc/gen/getpwent.c b/lib/libc/gen/getpwent.c
new file mode 100644
index 0000000..1da045e
--- /dev/null
+++ b/lib/libc/gen/getpwent.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (c) 1988, 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)getpwent.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <fcntl.h>
+#include <db.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <utmp.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+static struct passwd _pw_passwd;	/* password structure */
+static DB *_pw_db;			/* password database */
+static int _pw_keynum;			/* key counter */
+static int _pw_stayopen;		/* keep fd's open */
+static int __hashpw(), __initdb();
+
+struct passwd *
+getpwent()
+{
+	DBT key;
+	char bf[sizeof(_pw_keynum) + 1];
+
+	if (!_pw_db && !__initdb())
+		return((struct passwd *)NULL);
+
+	++_pw_keynum;
+	bf[0] = _PW_KEYBYNUM;
+	bcopy((char *)&_pw_keynum, bf + 1, sizeof(_pw_keynum));
+	key.data = (u_char *)bf;
+	key.size = sizeof(_pw_keynum) + 1;
+	return(__hashpw(&key) ? &_pw_passwd : (struct passwd *)NULL);
+}
+
+struct passwd *
+getpwnam(name)
+	const char *name;
+{
+	DBT key;
+	int len, rval;
+	char bf[UT_NAMESIZE + 1];
+
+	if (!_pw_db && !__initdb())
+		return((struct passwd *)NULL);
+
+	bf[0] = _PW_KEYBYNAME;
+	len = strlen(name);
+	bcopy(name, bf + 1, MIN(len, UT_NAMESIZE));
+	key.data = (u_char *)bf;
+	key.size = len + 1;
+	rval = __hashpw(&key);
+
+	if (!_pw_stayopen) {
+		(void)(_pw_db->close)(_pw_db);
+		_pw_db = (DB *)NULL;
+	}
+	return(rval ? &_pw_passwd : (struct passwd *)NULL);
+}
+
+struct passwd *
+#ifdef __STDC__
+getpwuid(uid_t uid)
+#else
+getpwuid(uid)
+	int uid;
+#endif
+{
+	DBT key;
+	int keyuid, rval;
+	char bf[sizeof(keyuid) + 1];
+
+	if (!_pw_db && !__initdb())
+		return((struct passwd *)NULL);
+
+	bf[0] = _PW_KEYBYUID;
+	keyuid = uid;
+	bcopy(&keyuid, bf + 1, sizeof(keyuid));
+	key.data = (u_char *)bf;
+	key.size = sizeof(keyuid) + 1;
+	rval = __hashpw(&key);
+
+	if (!_pw_stayopen) {
+		(void)(_pw_db->close)(_pw_db);
+		_pw_db = (DB *)NULL;
+	}
+	return(rval ? &_pw_passwd : (struct passwd *)NULL);
+}
+
+int
+setpassent(stayopen)
+	int stayopen;
+{
+	_pw_keynum = 0;
+	_pw_stayopen = stayopen;
+	return(1);
+}
+
+int
+setpwent()
+{
+	_pw_keynum = 0;
+	_pw_stayopen = 0;
+	return(1);
+}
+
+void
+endpwent()
+{
+	_pw_keynum = 0;
+	if (_pw_db) {
+		(void)(_pw_db->close)(_pw_db);
+		_pw_db = (DB *)NULL;
+	}
+}
+
+static
+__initdb()
+{
+	static int warned;
+	char *p;
+
+	p = (geteuid()) ? _PATH_MP_DB : _PATH_SMP_DB;
+	_pw_db = dbopen(p, O_RDONLY, 0, DB_HASH, NULL);
+	if (_pw_db)
+		return(1);
+	if (!warned)
+		syslog(LOG_ERR, "%s: %m", p);
+	return(0);
+}
+
+static
+__hashpw(key)
+	DBT *key;
+{
+	register char *p, *t;
+	static u_int max;
+	static char *line;
+	DBT data;
+
+	if ((_pw_db->get)(_pw_db, key, &data, 0))
+		return(0);
+	p = (char *)data.data;
+	if (data.size > max && !(line = realloc(line, max += 1024)))
+		return(0);
+
+	t = line;
+#define	EXPAND(e)	e = t; while (*t++ = *p++);
+	EXPAND(_pw_passwd.pw_name);
+	EXPAND(_pw_passwd.pw_passwd);
+	bcopy(p, (char *)&_pw_passwd.pw_uid, sizeof(int));
+	p += sizeof(int);
+	bcopy(p, (char *)&_pw_passwd.pw_gid, sizeof(int));
+	p += sizeof(int);
+	bcopy(p, (char *)&_pw_passwd.pw_change, sizeof(time_t));
+	p += sizeof(time_t);
+	EXPAND(_pw_passwd.pw_class);
+	EXPAND(_pw_passwd.pw_gecos);
+	EXPAND(_pw_passwd.pw_dir);
+	EXPAND(_pw_passwd.pw_shell);
+	bcopy(p, (char *)&_pw_passwd.pw_expire, sizeof(time_t));
+	p += sizeof(time_t);
+	return(1);
+}