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-rw-r--r--udev_sysdeps.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/udev_sysdeps.c b/udev_sysdeps.c
new file mode 100644
index 0000000000..152b7f0c5c
--- /dev/null
+++ b/udev_sysdeps.c
@@ -0,0 +1,207 @@
+/*
+ * udev_sysdeps.c - wrapping of libc features and kernel defines
+ *
+ * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2005-2006 Kay Sievers <kay.sievers@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 <errno.h>
+#include <sys/types.h>
+
+#include "udev.h"
+
+#ifndef __GLIBC__
+#define __OWN_USERDB_PARSER__
+#endif
+
+#ifdef __GLIBC__
+#define __OWN_STRLCPYCAT__
+#endif
+
+#ifdef USE_STATIC
+#define __OWN_USERDB_PARSER__
+#endif
+
+#ifdef __OWN_STRLCPYCAT__
+size_t strlcpy(char *dst, const char *src, size_t size)
+{
+ size_t bytes = 0;
+ char *q = dst;
+ const char *p = src;
+ char ch;
+
+ while ((ch = *p++)) {
+ if (bytes+1 < size)
+ *q++ = ch;
+ bytes++;
+ }
+
+ /* If size == 0 there is no space for a final null... */
+ if (size)
+ *q = '\0';
+
+ return bytes;
+}
+
+size_t strlcat(char *dst, const char *src, size_t size)
+{
+ size_t bytes = 0;
+ char *q = dst;
+ const char *p = src;
+ char ch;
+
+ while (bytes < size && *q) {
+ q++;
+ bytes++;
+ }
+ if (bytes == size)
+ return (bytes + strlen(src));
+
+ while ((ch = *p++)) {
+ if (bytes+1 < size)
+ *q++ = ch;
+ bytes++;
+ }
+
+ *q = '\0';
+ return bytes;
+}
+#endif /* __OWN_STRLCPYCAT__ */
+
+#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)
+ err("error resolving user '%s': %s", user, strerror(errno));
+ 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)
+ err("error resolving group '%s': %s", group, strerror(errno));
+ 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) {
+ err("can't open '%s' as db file: %s", dbfile, strerror(errno));
+ return 0;
+ }
+ dbg("search '%s' in '%s'", uname, 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 >= sizeof(line))
+ continue;
+
+ memcpy(line, bufline, count-1);
+ line[count-1] = '\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__ */