[PATCH] add $local user spport for permissions

[elogind.git] / udev-add.c

diff --git a/udev-add.c b/udev-add.c
index 3a72c544b8b9b20af53c61153c6b4e3aee579bda..19196bec543953ff2551be758a20e65838c1cd7f 100644 (file)
--- a/udev-add.c
+++ b/udev-add.c
@@ -32,6 +32,7 @@
 #include <grp.h>
 #ifndef __KLIBC__
 #include <pwd.h>
+#include <utmp.h>
 #endif
 
 #include "libsysfs/sysfs/libsysfs.h"
@@ -44,6 +45,8 @@
 #include "udevdb.h"
 #include "klibc_fixups.h"
 
+#define LOCAL_USER "$local"
+
 /* 
  * Right now the major/minor of a device is stored in a file called
  * "dev" in sysfs.
@@ -132,6 +135,37 @@ static int make_node(char *filename, int major, int minor, unsigned int mode, ui
        return 0;
 }
 
+/* get the local logged in user */
+static void set_to_local_user(char *user)
+{
+       struct utmp *u;
+       time_t recent = 0;
+
+       strnfieldcpy(user, default_owner_str, OWNER_SIZE);
+       setutent();
+       while (1) {
+               u = getutent();
+               if (u == NULL)
+                       break;
+
+               /* is this a user login ? */
+               if (u->ut_type != USER_PROCESS)
+                       continue;
+
+               /* is this a local login ? */
+               if (strcmp(u->ut_host, ""))
+                       continue;
+
+               if (u->ut_time > recent) {
+                       recent = u->ut_time;
+                       strfieldcpy(user, u->ut_user);
+                       dbg("local user is '%s'", user);
+                       break;
+               }
+       }
+       endutent();
+}
+
 static int create_node(struct udevice *dev, int fake)
 {
        struct stat stats;
@@ -175,6 +209,9 @@ static int create_node(struct udevice *dev, int fake)
                if (endptr[0] == '\0')
                        uid = (uid_t) id;
                else {
+                       if (strncmp(dev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
+                               set_to_local_user(dev->owner);
+
                        struct passwd *pw = getpwnam(dev->owner);
                        if (pw == NULL)
                                dbg("specified user unknown '%s'", dev->owner);