linux-kernel - [PATCH 3/3] exporting capability code/name pairs (try 2nd)

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Date:	Fri, 25 Jan 2008 14:18:40 +0900
From:	Kohei KaiGai <kaigai@...jp.nec.com>
To:	morgan@...nel.org
CC:	akpm@...l.org, serue@...ibm.com, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: [PATCH 3/3] exporting capability code/name pairs (try 2nd)

We can apply this patch to libcap.

This patch enables setcap command to print the list
of capabilities running kernel supported, if the kernel
exports capability code/name pairs.
It is useful to confirm the name of capability when setting.

Thanks,
----
Signed-off-by: KaiGai Kohei <kaigai@...jp.nec.com>

diff --git a/progs/setcap.c b/progs/setcap.c
index dc13c06..1b9ed45 100644
--- a/progs/setcap.c
+++ b/progs/setcap.c
@@ -4,6 +4,7 @@
  * This sets the capabilities of a given file.
  */

+#include <dirent.h>
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
@@ -13,10 +14,34 @@

 static void usage(void)
 {
+    DIR *dirp;
+
     fprintf(stderr,
 	    "usage: setcap [-q] (-r|-|<caps>) <filename> "
 	    "[ ... (-r|-|<capsN>) <filenameN> ]\n"
 	);
+
+    dirp = opendir("/sys/kernel/capability");
+    if (dirp) {
+	struct dirent *dent;
+	int len, width = 99999;
+
+	fprintf(stderr,
+		"\nsupported capabilities:");
+	while ((dent = readdir(dirp)) != NULL) {
+	    if (!!strncmp("cap_", dent->d_name, 4))
+		continue;
+	    len = strlen(dent->d_name);
+	    if (width + len > 72) {
+		fprintf(stderr, "\n\t");
+		width = 8;
+	    }
+	    fprintf(stderr, "%s ", dent->d_name);
+	    width += len;
+	}
+	fputc('\n', stderr);
+	closedir(dirp);
+    }
     exit(1);
 }


-- 
OSS Platform Development Division, NEC
KaiGai Kohei <kaigai@...jp.nec.com>
--
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