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-rw-r--r--lib/libc/gen/getpwent.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/lib/libc/gen/getpwent.c b/lib/libc/gen/getpwent.c
new file mode 100644
index 0000000..c9bbd37
--- /dev/null
+++ b/lib/libc/gen/getpwent.c
@@ -0,0 +1,490 @@
+/*
+ * 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 */
+#ifdef YP
+static struct passwd _pw_copy;
+static int _yp_enabled; /* set true when yp enabled */
+static int _pw_stepping_yp; /* set true when stepping thru map */
+#endif
+static int __hashpw(), __initdb();
+
+static int _havemaster(const char *);
+static int _getyppass(struct passwd *, const char *, const char *);
+static int _nextyppass(struct passwd *);
+
+struct passwd *
+getpwent()
+{
+ DBT key;
+ char bf[sizeof(_pw_keynum) + 1];
+ int rv;
+
+ if (!_pw_db && !__initdb())
+ return((struct passwd *)NULL);
+
+#ifdef YP
+ if(_pw_stepping_yp) {
+ _pw_passwd = _pw_copy;
+ return (_nextyppass(&_pw_passwd) ? &_pw_passwd : 0);
+ }
+#endif
+
+tryagain:
+ ++_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;
+ rv = __hashpw(&key);
+ if(!rv) return (struct passwd *)NULL;
+#ifdef YP
+ if(_pw_passwd.pw_name[0] == '+' && _pw_passwd.pw_name[1]) {
+ _getyppass(&_pw_passwd, &_pw_passwd.pw_name[1],
+ "passwd.byname");
+ } else if(_pw_passwd.pw_name[0] == '+') {
+ _pw_copy = _pw_passwd;
+ return (_nextyppass(&_pw_passwd) ? &_pw_passwd : 0);
+ }
+#else
+ /* Ignore YP password file entries when YP is disabled. */
+ if(_pw_passwd.pw_name[0] == '+') {
+ goto tryagain;
+ }
+#endif
+ return(&_pw_passwd);
+}
+
+struct passwd *
+getpwnam(name)
+ const char *name;
+{
+ DBT key;
+ int len, rval;
+ char bf[UT_NAMESIZE + 2];
+
+ 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);
+
+#ifdef YP
+ if (!rval && _yp_enabled) {
+ bf[1] = '+';
+ bcopy(name, bf + 2, MIN(len, UT_NAMESIZE - 1));
+ key.data = (u_char *)bf;
+ key.size = len + 2;
+ rval = __hashpw(&key);
+ if (!rval && _yp_enabled < 0) {
+ key.size = 2;
+ rval = __hashpw(&key);
+ }
+ if(rval)
+ rval = _getyppass(&_pw_passwd, name, "passwd.byname");
+ }
+#endif
+ /*
+ * Prevent login attempts when YP is not enabled but YP entries
+ * are in /etc/master.passwd.
+ */
+ if (rval && _pw_passwd.pw_name[0] == '+') rval = 0;
+
+ 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);
+
+#ifdef YP
+ if (!rval && _yp_enabled) {
+ char ypbuf[16]; /* big enough for 32-bit uids and then some */
+ snprintf(ypbuf, sizeof ypbuf, "%u", (unsigned)uid);
+ rval = _getyppass(&_pw_passwd, ypbuf, "passwd.byuid");
+ }
+#endif
+ 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;
+#ifdef YP
+ _pw_stepping_yp = 0;
+#endif
+ _pw_stayopen = stayopen;
+ return(1);
+}
+
+int
+setpwent()
+{
+ _pw_keynum = 0;
+#ifdef YP
+ _pw_stepping_yp = 0;
+#endif
+ _pw_stayopen = 0;
+ return(1);
+}
+
+void
+endpwent()
+{
+ _pw_keynum = 0;
+#ifdef YP
+ _pw_stepping_yp = 0;
+#endif
+ 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) {
+#ifdef YP
+ DBT key, data;
+ char buf[] = { _PW_KEYYPENABLED };
+ key.data = buf;
+ key.size = 1;
+ if ((_pw_db->get)(_pw_db, &key, &data, 0)) {
+ _yp_enabled = 0;
+ } else {
+ /* Distinguish between old and new versions of
+ pwd_mkdb. */
+ if(data.size != 1) {
+ _yp_enabled = -1;
+ } else {
+ _yp_enabled = (int)*((char *)data.data) - 2;
+ }
+ }
+#endif
+ 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;
+
+ /*
+ * XXX The pw_fields member of _pw_passwd needs to be cleared
+ * at some point since __hashpw() can be called several times in
+ * a single program. If we leave here after the second invokation
+ * with garbage data in pw_fields, it can totally screw up NIS
+ * lookups (the pw_breakout_yp function only populates the pw_passwd
+ * structure if the pw_fields bits are clear).
+ */
+ if ((_pw_db->get)(_pw_db, key, &data, 0)) {
+ if (_pw_passwd.pw_fields)
+ _pw_passwd.pw_fields = 0;
+ return(0);
+ }
+ p = (char *)data.data;
+ if (data.size > max && !(line = realloc(line, max += 1024))) {
+ if (_pw_passwd.pw_fields)
+ _pw_passwd.pw_fields = 0;
+ 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);
+ bcopy(p, (char *)&_pw_passwd.pw_fields, sizeof _pw_passwd.pw_fields);
+ p += sizeof _pw_passwd.pw_fields;
+ return(1);
+}
+
+#ifdef YP
+static void
+_pw_breakout_yp(struct passwd *pw, char *result, int master)
+{
+ char *s;
+
+ s = strsep(&result, ":"); /* name */
+ if(!(pw->pw_fields & _PWF_NAME) || (pw->pw_name[0] == '+')) {
+ pw->pw_name = s;
+ pw->pw_fields |= _PWF_NAME;
+ }
+
+ s = strsep(&result, ":"); /* password */
+ if(!(pw->pw_fields & _PWF_PASSWD)) {
+ pw->pw_passwd = s;
+ pw->pw_fields |= _PWF_PASSWD;
+ }
+
+ s = strsep(&result, ":"); /* uid */
+ if(!(pw->pw_fields & _PWF_UID)) {
+ pw->pw_uid = atoi(s);
+ pw->pw_fields |= _PWF_UID;
+ }
+
+ s = strsep(&result, ":"); /* gid */
+ if(!(pw->pw_fields & _PWF_GID)) {
+ pw->pw_gid = atoi(s);
+ pw->pw_fields |= _PWF_GID;
+ }
+
+ if (master) {
+ s = strsep(&result, ":"); /* class */
+ if(!(pw->pw_fields & _PWF_CLASS)) {
+ pw->pw_class = s;
+ pw->pw_fields |= _PWF_CLASS;
+ }
+
+ s = strsep(&result, ":"); /* change */
+ if(!(pw->pw_fields & _PWF_CHANGE)) {
+ pw->pw_change = atol(s);
+ pw->pw_fields |= _PWF_CHANGE;
+ }
+
+ s = strsep(&result, ":"); /* expire */
+ if(!(pw->pw_fields & _PWF_EXPIRE)) {
+ pw->pw_expire = atol(s);
+ pw->pw_fields |= _PWF_EXPIRE;
+ }
+ }
+
+ s = strsep(&result, ":"); /* gecos */
+ if(!(pw->pw_fields & _PWF_GECOS)) {
+ pw->pw_gecos = s;
+ pw->pw_fields |= _PWF_GECOS;
+ }
+
+ s = strsep(&result, ":"); /* dir */
+ if(!(pw->pw_fields & _PWF_DIR)) {
+ pw->pw_dir = s;
+ pw->pw_fields |= _PWF_DIR;
+ }
+
+ s = strsep(&result, ":"); /* shell */
+ if(!(pw->pw_fields & _PWF_SHELL)) {
+ pw->pw_shell = s;
+ pw->pw_fields |= _PWF_SHELL;
+ }
+}
+
+static char *_pw_yp_domain;
+
+static int
+_havemaster(const char *_pw_yp_domain)
+{
+ char *result;
+ static char *key;
+ int resultlen;
+ static int keylen;
+
+ if (yp_first(_pw_yp_domain, "master.passwd.byname",
+ &key, &keylen, &result, &resultlen))
+ return 0;
+
+ return 1;
+}
+
+static int
+_getyppass(struct passwd *pw, const char *name, const char *map)
+{
+ char *result, *s;
+ static char resultbuf[1024];
+ int resultlen;
+ char mastermap[1024];
+ int gotmaster = 0;
+
+ if(!_pw_yp_domain) {
+ if(yp_get_default_domain(&_pw_yp_domain))
+ return 0;
+ }
+
+ sprintf(mastermap,"%s",map);
+
+ /* Don't even bother with this if we aren't root. */
+ if (!geteuid())
+ if (_havemaster(_pw_yp_domain)) {
+ sprintf(mastermap,"master.%s", map);
+ gotmaster++;
+ }
+
+ if(yp_match(_pw_yp_domain, &mastermap, name, strlen(name),
+ &result, &resultlen))
+ return 0;
+
+ s = strchr(result, '\n');
+ if(s) *s = '\0';
+
+ if(resultlen >= sizeof resultbuf) return 0;
+ strcpy(resultbuf, result);
+ result = resultbuf;
+ _pw_breakout_yp(pw, resultbuf, gotmaster);
+
+ return 1;
+}
+
+static int
+_nextyppass(struct passwd *pw)
+{
+ static char *key;
+ static int keylen;
+ char *lastkey, *result;
+ static char resultbuf[1024];
+ int resultlen;
+ int rv;
+ char *map = "passwd.byname";
+ int gotmaster = 0;
+
+ if(!_pw_yp_domain) {
+ if(yp_get_default_domain(&_pw_yp_domain))
+ return 0;
+ }
+
+ /* Don't even bother with this if we aren't root. */
+ if (!geteuid())
+ if(_havemaster(_pw_yp_domain)) {
+ map = "master.passwd.byname";
+ gotmaster++;
+ }
+
+ if(!_pw_stepping_yp) {
+ if(key) free(key);
+ rv = yp_first(_pw_yp_domain, map,
+ &key, &keylen, &result, &resultlen);
+ if(rv) {
+ return 0;
+ }
+ _pw_stepping_yp = 1;
+ goto unpack;
+ } else {
+tryagain:
+ lastkey = key;
+ rv = yp_next(_pw_yp_domain, map, key, keylen,
+ &key, &keylen, &result, &resultlen);
+ free(lastkey);
+unpack:
+ if(rv) {
+ _pw_stepping_yp = 0;
+ return 0;
+ }
+
+ if(resultlen > sizeof(resultbuf)) {
+ free(result);
+ goto tryagain;
+ }
+
+ strcpy(resultbuf, result);
+ free(result);
+ if(result = strchr(resultbuf, '\n')) *result = '\0';
+ _pw_breakout_yp(pw, resultbuf, gotmaster);
+ }
+ return 1;
+}
+
+#endif /* YP */
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