[PATCH] remove Makefile magic for klibc integration

The new libsysfs and klibc don't need that anymore.
Wrap getpwnam(), so we can use the built-in /etc/passwd
parser for statically compiled glibc binaries too.

1 files changed, 162 insertions, 0 deletions

diff --git a/udev_libc_wrapper.c b/udev_libc_wrapper.c
new file mode 100644
index 0000000000..df54515206
--- /dev/null
+++ b/udev_libc_wrapper.c
@@ -0,0 +1,162 @@
+/*
+ * udev_libc_wrapper - wrapping of functions missing in a specific libc
+ *		       or not working in a statically compiled binary
+ *
+ * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2005 Kay Sievers <kay@vrfy.org>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ * 
+ *	This program is distributed in the hope that it will be useful, but
+ *	WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *	General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU General Public License along
+ *	with this program; if not, write to the Free Software Foundation, Inc.,
+ *	675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <sys/types.h>
+
+#include "../udev_libc_wrapper.h"
+#include "../udev.h"
+#include "../udev_utils.h"
+#include "../logging.h"
+
+
+#ifdef __KLIBC__
+#define __OWN_USERDB_PARSER__
+#endif
+#ifdef USE_STATIC
+#define __OWN_USERDB_PARSER__
+#endif
+
+#ifndef __OWN_USERDB_PARSER__
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <grp.h>
+
+uid_t lookup_user(const char *user)
+{
+	struct passwd *pw;
+	uid_t uid = 0;
+
+	pw = getpwnam(user);
+	if (pw == NULL)
+		dbg("specified user unknown '%s'", user);
+	else
+		uid = pw->pw_uid;
+
+	return uid;
+}
+
+gid_t lookup_group(const char *group)
+{
+	struct group *gr;
+	gid_t gid = 0;
+
+	gr = getgrnam(group);
+	if (gr == NULL)
+		dbg("specified group unknown '%s'", group);
+	else
+		gid = gr->gr_gid;
+
+	return gid;
+}
+
+#else /* __OWN_USERDB_PARSER__ */
+
+#define PASSWD_FILE		"/etc/passwd"
+#define GROUP_FILE		"/etc/group"
+
+/* return the id of a passwd style line, selected by the users name */
+static unsigned long get_id_by_name(const char *uname, const char *dbfile)
+{
+	unsigned long id = 0;
+	char line[LINE_SIZE];
+	char *buf;
+	char *bufline;
+	size_t bufsize;
+	size_t cur;
+	size_t count;
+	char *pos;
+	char *name;
+	char *idstr;
+	char *tail;
+
+	if (file_map(dbfile, &buf, &bufsize) != 0) {
+		dbg("can't open '%s' as db file", dbfile);
+		return 0;
+	}
+	dbg("reading '%s' as db file", dbfile);
+
+	/* loop through the whole file */
+	cur = 0;
+	while (cur < bufsize) {
+		count = buf_get_line(buf, bufsize, cur);
+		bufline = &buf[cur];
+		cur += count+1;
+
+		if (count >= LINE_SIZE)
+			continue;
+
+		strncpy(line, bufline, count);
+		line[count] = '\0';
+		pos = line;
+
+		/* get name */
+		name = strsep(&pos, ":");
+		if (name == NULL)
+			continue;
+
+		/* skip pass */
+		if (strsep(&pos, ":") == NULL)
+			continue;
+
+		/* get id */
+		idstr = strsep(&pos, ":");
+		if (idstr == NULL)
+			continue;
+
+		if (strcmp(uname, name) == 0) {
+			id = strtoul(idstr, &tail, 10);
+			if (tail[0] != '\0') {
+				id = 0;
+				dbg("no id found for '%s'",  name);
+			} else
+				dbg("id for '%s' is '%li'", name, id);
+			break;
+		}
+	}
+
+	file_unmap(buf, bufsize);
+	return id;
+}
+
+uid_t lookup_user(const char *user)
+{
+	unsigned long id;
+
+	id = get_id_by_name(user, PASSWD_FILE);
+	return (uid_t) id;
+}
+
+gid_t lookup_group(const char *group)
+{
+	unsigned long id;
+
+	id = get_id_by_name(group, GROUP_FILE);
+	return (gid_t) id;
+}
+
+#endif /* __OWN_USERDB_PARSER__ */