selinux/libselinux/utils/getdefaultcon.c

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#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <selinux/selinux.h>
#include <selinux/get_context_list.h>
static void usage(const char *name, const char *detail, int rc)
{
fprintf(stderr, "usage: %s [-l level] user fromcon\n", name);
if (detail)
fprintf(stderr, "%s: %s\n", name, detail);
exit(rc);
}
int main(int argc, char **argv)
{
security_context_t usercon = NULL, cur_context = NULL;
char *user = NULL, *level = NULL, *role=NULL, *seuser=NULL, *dlevel=NULL;
int ret, opt;
int verbose = 0;
while ((opt = getopt(argc, argv, "l:r:v")) > 0) {
switch (opt) {
case 'l':
level = strdup(optarg);
break;
case 'r':
role = strdup(optarg);
break;
case 'v':
verbose = 1;
break;
default:
usage(argv[0], "invalid option", 1);
}
}
if (((argc - optind) < 1) || ((argc - optind) > 2))
usage(argv[0], "invalid number of arguments", 2);
/* If selinux isn't available, bail out. */
if (!is_selinux_enabled()) {
fprintf(stderr,
"%s may be used only on a SELinux kernel.\n", argv[0]);
return 1;
}
user = argv[optind];
/* If a context wasn't passed, use the current context. */
if (((argc - optind) < 2)) {
if (getcon(&cur_context) < 0) {
fprintf(stderr, "Couldn't get current context.\n");
return 2;
}
} else
cur_context = argv[optind + 1];
if ((ret = getseuserbyname(user, &seuser, &dlevel)) == 0) {
if (! level) level=dlevel;
if (role != NULL && role[0])
ret=get_default_context_with_rolelevel(seuser, role, level,cur_context,&usercon);
else
ret=get_default_context_with_level(seuser, level, cur_context,&usercon);
}
if (ret < 0)
perror(argv[0]);
else {
if (verbose) {
printf("%s: %s from %s %s %s %s -> %s\n", argv[0], user, cur_context, seuser, role, level, usercon);
} else {
printf("%s", usercon);
}
}
free(role);
free(seuser);
if (level != dlevel) free(level);
free(dlevel);
free(usercon);
return ret >= 0;
}