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/*
* $Id: setpcaps.c,v 1.2 1999/11/18 06:04:26 morgan Exp $
*
* Copyright (c) 1997-8 Andrew G. Morgan <morgan@linux.kernel.org>
*
* This sets the capabilities of a given process.
*/
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#undef _POSIX_SOURCE
#include <sys/capability.h>
#include <unistd.h>
static void usage(void)
{
fprintf(stderr,
"usage: setcap [-q] (-|<caps>) <pid> [ ... (-|<capsN>) <pid> ]\n\n"
" This program can be used to set the process capabilities of running\n"
" processes. In order to work, it needs to be executing with CAP_SETPCAP\n"
" raised, and the only capabilities that this program can bestow on others\n"
" are a subset of its effective set. This program is mostly intended as an\n"
" example -- a safe use of CAP_SETPCAP has yet to be demonstrated!\n\n"
"[Copyright (c) 1997-8 Andrew G. Morgan <morgan@linux.kernel.org>]\n"
);
exit(1);
}
#define MAXCAP 2048
static int read_caps(int quiet, const char *filename, char *buffer)
{
int i=MAXCAP;
if (!quiet) {
fprintf(stderr, "Please enter caps for file [empty line to end]:\n");
}
while (i > 0) {
int j = read(STDIN_FILENO, buffer, i);
if (j < 0) {
fprintf(stderr, "\n[Error - aborting]\n");
exit(1);
}
if (j==0 || buffer[0] == '\n') {
/* we're done */
break;
}
/* move on... */
i -= j;
buffer += j;
}
/* <NUL> terminate */
buffer[0] = '\0';
return (i < MAXCAP ? 0:-1);
}
int main(int argc, char **argv)
{
char buffer[MAXCAP+1];
int retval, quiet=0;
cap_t cap_d;
if (argc < 3) {
usage();
}
while (--argc > 0) {
const char *text;
pid_t pid;
if (!strcmp(*++argv,"-q")) {
quiet = 1;
continue;
}
if (!strcmp(*argv,"-")) {
retval = read_caps(quiet, *argv, buffer);
if (retval)
usage();
text = buffer;
} else
text = *argv;
cap_d = cap_from_text(text);
if (cap_d == NULL) {
perror("fatal error");
usage();
}
#ifndef DEBUG
{
ssize_t length;
char *result;
result = cap_to_text(cap_d, &length);
fprintf(stderr, "[caps set to:\n%s\n]\n", result);
cap_free(result);
result = NULL;
}
#endif
if (--argc <= 0)
usage();
pid = atoi(*++argv);
retval = capsetp(pid, cap_d);
if (retval != 0) {
fprintf(stderr, "Failed to set cap's on process `%d': (%s)\n",
pid, strerror(errno));
usage();
}
#ifndef DEBUG
fprintf(stderr, "[caps set on %d]\n", pid);
#endif
}
return 0;
}
/*
* $Log: setpcaps.c,v $
* Revision 1.2 1999/11/18 06:04:26 morgan
* use cap_free and not free for string from cap_to_text()
*
* Revision 1.1.1.1 1999/04/17 22:16:31 morgan
* release 1.0 of libcap
*
* Revision 1.3 1998/09/20 23:07:08 morgan
* fixed comment at top
*
* Revision 1.2 1998/06/08 00:17:38 morgan
* change to accommodate alpha (glibc?)
*
* Revision 1.1 1998/06/07 01:46:51 morgan
* Initial revision
*
* Revision 1.2 1997/05/04 05:34:32 morgan
* non void main
*
* Revision 1.1 1997/04/28 01:01:20 morgan
* Initial revision
*
*/
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