Programma di esempio delle funzioni delle capabilities, e un po' di

[gapil.git] / sources / getcap.c

diff --git a/sources/getcap.c b/sources/getcap.c
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+/* getcap.c
+ * 
+ * Copyright (C) 2006 Simone Piccardi
+ * 
+ * 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; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * 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.
+ */
+/****************************************************************
+ *
+ * Program getcap.c: 
+ * Program to test capabilities functions
+ *
+ * Author: Simone Piccardi
+ * Mar. 2006
+ *
+ * Usage: getcap -h give all info's
+ *
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#define _GNU_SOURCE
+#include <errno.h>       /* error definitions and routines */ 
+#include <stdlib.h>      /* C standard library */
+#include <unistd.h>      /* unix standard library */
+#include <stdio.h>      /* standard I/O library */
+#include <string.h>      /* string functions */
+#include <sys/types.h>
+#include <sys/capability.h>
+
+/* Help printing routine */
+void usage(void);
+
+int main(int argc, char *argv[])
+{
+/* 
+ * Variables definition  
+ */
+    int i;
+    pid_t pid = 0;
+    cap_t capab = NULL;
+    char *string;
+    int res;
+
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "hp:")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':   /* help option */
+           printf("Wrong -h option use\n");
+           usage();
+           return -1;
+           break;
+       case 'p':   /* specify pid */
+           pid = strtol(optarg, NULL, 10);
+           break;
+       case '?':   /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:    /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    if ( (argc-optind) != 0)  {
+        printf("From %d arguments, removed %d options\n", argc, optind);
+        usage();
+    }
+    
+    if (!pid) {
+       capab = cap_get_proc();
+       if (capab == NULL) {
+           perror("cannot get current process capabilities");
+           return 1;
+       }
+    } else {
+       capab = cap_init();
+       res = capgetp(pid, capab);
+       if (res) {
+           perror("cannot get process capabilities");
+           return 1;
+       }
+    }
+
+    string = cap_to_text(capab, NULL);
+    printf("Capability: %s\n", string);
+
+    cap_free(capab);
+    return 0;
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program getcap: print current process capabilities \n");
+    printf("Usage:\n");
+    printf("  getcap [-h] [-p pid] \n");
+    printf("  -h          print this help\n");
+    printf("  -p PID      print process PID capabilities\n");
+    
+    exit(1);
+}
+
+