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/*
* Copyright (c) 1997,2007 Andrew G. Morgan <morgan@kernel.org>
*
* This sets the capabilities of a given file.
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/capability.h>
#include <unistd.h>
static void usage(void)
{
fprintf(stderr,
"usage: setcap [-q] (-r|-|<caps>) <filename> "
"[ ... (-r|-|<capsN>) <filenameN> ]\n"
"\n"
" Note <filename> must be a regular (non-symlink) file.\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 mycaps;
cap_value_t capflag;
if (argc < 3) {
usage();
}
mycaps = cap_get_proc();
if (mycaps == NULL) {
fprintf(stderr, "warning - unable to get process capabilities"
" (old libcap?)\n");
} else {
capflag = CAP_SETFCAP;
/*
* Raise the effective CAP_SETPCAP.
*/
if (cap_set_flag(mycaps, CAP_EFFECTIVE, 1, &capflag, CAP_SET) != 0) {
perror("unable to manipulate CAP_SETFCAP - try a newer libcap?");
exit(1);
}
if (cap_set_proc(mycaps) != 0) {
perror("unable to set CAP_SETFCAP effective capability");
exit(1);
}
}
while (--argc > 0) {
const char *text;
cap_t cap_d;
if (!strcmp(*++argv,"-q")) {
quiet = 1;
continue;
}
if (!strcmp(*argv,"-r")) {
cap_d = NULL;
} else {
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();
}
#ifdef DEBUG
{
ssize_t length;
const char *result;
result = cap_to_text(cap_d, &length);
fprintf(stderr, "caps set to: [%s]\n", result);
}
#endif
}
if (--argc <= 0)
usage();
/*
* Set the filesystem capability for this file.
*/
retval = cap_set_file(*++argv, cap_d);
if (retval != 0) {
fprintf(stderr, "Failed to set capabilities on file `%s' (%s)\n",
argv[0], strerror(errno));
usage();
}
if (cap_d) {
cap_free(cap_d);
}
}
return 0;
}
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