mirror of
https://github.com/rd235/cado
synced 2024-12-27 06:24:11 +01:00
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
|
|
* cado: execute a command in a capability ambient
|
|
* Copyright (C) 2016 Renzo Davoli, University of Bologna
|
|
*
|
|
* This file is part of cado.
|
|
*
|
|
* Cado 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdint.h>
|
|
#include <getopt.h>
|
|
#include <libgen.h>
|
|
#include <sys/capability.h>
|
|
|
|
char *tag="CapAmb:\t";
|
|
uint64_t get_capamb(pid_t pid) {
|
|
FILE *f;
|
|
char filename[32];
|
|
int status=0;
|
|
int target=strlen(tag);
|
|
uint64_t capamb=0;
|
|
int c;
|
|
snprintf(filename,32,"/proc/%d/status",pid);
|
|
|
|
f=fopen(filename,"r");
|
|
if (f==NULL)
|
|
exit(2);
|
|
|
|
while ((c = getc(f)) != EOF) {
|
|
if (c == tag[status]) {
|
|
status++;
|
|
if (status == target) {
|
|
fscanf(f,"%llx",&capamb);
|
|
break;
|
|
}
|
|
} else
|
|
status=0;
|
|
}
|
|
fclose(f);
|
|
return capamb;
|
|
}
|
|
|
|
#define OPTSTRING "hpcl"
|
|
struct option long_options[]={
|
|
{"help", no_argument, NULL, 'h'},
|
|
{"prompt", no_argument, NULL, 'p'},
|
|
{"compact", no_argument, NULL, 'c'},
|
|
{"long", no_argument, NULL, 'l'},
|
|
};
|
|
|
|
void usage(char *progname) {
|
|
fprintf(stderr,"%s - show the current capability ambient\n\n",progname);
|
|
fprintf(stderr,"usage: %s OPTIONS [pid]\n\n",progname);
|
|
fprintf(stderr,"Options:\n");
|
|
fprintf(stderr," -h, --help display help message and exit\n");
|
|
fprintf(stderr," -p, --prompt single line output for the command prompt\n");
|
|
fprintf(stderr," -c, --compact single line without cap_ prefix\n");
|
|
fprintf(stderr," -l, --long display cap# and mask\n");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[]) {
|
|
uint64_t capamb;
|
|
char *progname=basename(argv[0]);
|
|
int prompt=0;
|
|
int compact=0;
|
|
int longlist=0;
|
|
while (1) {
|
|
int c=getopt_long(argc, argv, OPTSTRING, long_options, NULL);
|
|
if (c < 0)
|
|
break;
|
|
switch (c) {
|
|
case 'h': usage(progname);
|
|
break;
|
|
case 'p': prompt=compact=1;
|
|
break;
|
|
case 'c': compact=1;
|
|
break;
|
|
case 'l': longlist=1;
|
|
break;
|
|
default:
|
|
usage(progname);
|
|
}
|
|
}
|
|
|
|
if (argc - optind > 1)
|
|
usage(progname);
|
|
|
|
if (optind < argc)
|
|
capamb=get_capamb(atoi(argv[optind]));
|
|
else
|
|
capamb=get_capamb(getpid());
|
|
if (capamb) {
|
|
cap_value_t cap;
|
|
char *sep="";
|
|
int count=0;
|
|
for (cap = 0; cap <= CAP_LAST_CAP; cap++) {
|
|
if (capamb & (1ULL << cap)) {
|
|
count++;
|
|
if (longlist)
|
|
printf("%2d %016llx %s\n",cap,1ULL<<cap,cap_to_name(cap));
|
|
else if (compact)
|
|
printf("%s%s",sep,cap_to_name(cap)+4);
|
|
else
|
|
printf("%s\n",cap_to_name(cap));
|
|
sep=",";
|
|
}
|
|
}
|
|
if (prompt) printf("#");
|
|
if (compact) printf("\n");
|
|
if (longlist && count > 1)
|
|
printf(" %016llx\n",capamb);
|
|
}
|
|
}
|