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#define _POSIX_C_SOURCE 200809L
#define _XOPEN_SOURCE 700
#include <ctype.h>
#include <errno.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/capability.h>
static void print_function_result (bool success, const char* function){
if (success) {
printf ("\033[1;32m%s\033[0m: OK\n", function);
} else {
printf ("\033[1;31m%s\033[0m: %s\n", function, strerror (errno));
}
}
static bool check_error_int (int rval, const char* function) {
if (rval < 0){
print_function_result (false, function);
return true;
} else {
print_function_result (true, function);
return false;
}
}
static bool check_error_ptr (void* rval, const char* function) {
if (rval == NULL) {
print_function_result (false, function);
return true;
} else {
print_function_result (true, function);
return false;
}
}
static const char* read_input (const char* prompt) {
static char* buffer_ptr = NULL;
static size_t buffer_len = 0;
clearerr (stdin);
fputs (prompt, stdout);
fflush (stdout);
ssize_t str_len = getline (&buffer_ptr, &buffer_len, stdin);
if (str_len < 0) {
free (buffer_ptr);
buffer_ptr = NULL;
buffer_len = 0;
return "";
}
buffer_ptr[str_len - 1] = '\0';
return buffer_ptr;
}
int main (int argc, char* argv[]) {
setlocale (LC_ALL, "");
cap_t store = NULL;
while (true) {
const char* input = read_input ("\033[1;33mcap>\033[m ");
if (feof (stdin)) {
goto loop_end;
}
switch (input[0]){
case 'c': {
cap_flag_t flag;
input = read_input ("[E]ffective [P]ermitted [I]nheritable ? ");
switch (toupper (input[0])) {
case 'E':
flag = CAP_EFFECTIVE;
break;
case 'P':
flag = CAP_PERMITTED;
break;
case 'I':
flag = CAP_INHERITABLE;
break;
default:
continue;
}
check_error_int (cap_clear_flag (store, flag), "cap_clear_flag");
} break;
case 'e': {
cap_flag_t flag;
input = read_input ("[E]ffective [P]ermitted [I]nheritable ? ");
switch (toupper (input[0])) {
case 'E':
flag = CAP_EFFECTIVE;
break;
case 'P':
flag = CAP_PERMITTED;
break;
case 'I':
flag = CAP_INHERITABLE;
break;
default:
continue;
}
cap_value_t value;
input = read_input ("Capability= ");
if (check_error_int (cap_from_name (input, &value), "cap_from_name")) {
break;
}
cap_flag_value_t flag_value;
input = read_input ("[C]lear [S]et ? ");
switch (toupper (input[0])) {
case 'C':
case 'R':
case '0':
flag_value = CAP_CLEAR;
break;
case 'S':
case '1':
flag_value = CAP_SET;
break;
}
check_error_int (
cap_set_flag (store, flag, 1, &value, flag_value),
"cap_set_flag");
} break;
case 'i':
if (store != NULL) {
check_error_int (cap_free (store), "cap_free");
store = NULL;
}
check_error_ptr (store = cap_init (), "cap_init");
break;
case 'f':
if (store == NULL) {
break;
}
check_error_int (cap_free (store), "cap_free");
store = NULL;
break;
case 'r':
if (store != NULL){
check_error_int (cap_free(store), "cap_free");
store = NULL;
}
input = read_input ("[P]rocess [F]ile ? ");
switch(toupper (input[0])){
case 'P':
case '1':
input = read_input ("PID= ");
check_error_ptr (
store = cap_get_pid ((pid_t)atol (input)),
"cap_get_pid");
break;
case 'F':
case '2':
input = read_input ("File= ");
check_error_ptr (
store = cap_get_file (input),
"cap_set_file");
break;
}
break;
case 'w':
if (store != NULL) {
input = read_input ("File= ");
check_error_int (cap_set_file (input, store), "cap_set_file");
}
break;
case 'p': {
char *ctext;
if (store == NULL) {
break;
}
check_error_ptr (ctext = cap_to_text (store, NULL), "cap_to_text");
if (ctext != NULL) {
puts (ctext);
check_error_int (cap_free (ctext), "cap_free");
}
} break;
default:
fputs (
" c\tClear a capability set\n"
" e\tEdit the capability data structure\n"
" f\tFree the capability data structure\n"
" i\tClear and Initialize a new capability\n"
" p\tPrint the current capability\n"
" r\tRead and Replace the capability\n"
" w\tSet the current capability to a process or a file\n",
stdout);
}
}
loop_end:
if (store != NULL) {
check_error_int (cap_free (store), "cap_free");
store = NULL;
}
return 0;
}
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