mirror of
https://github.com/SELinuxProject/selinux
synced 2024-12-12 00:55:03 +00:00
0c407c3f1d
Print error description on failure after functions known to set errno. Also mention the library function name in getenforce, policyvers and setenforce instead of the program name twice. Signed-off-by: Christian Göttsche <cgzones@googlemail.com> Acked-by: James Carter <jwcart2@gmail.com>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <errno.h>
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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static __attribute__ ((__noreturn__)) void usage(const char *progname)
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{
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fprintf(stderr,
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"usage: %s -b backend [-v] [-r] -k key [-t type] [-f file]\n\n"
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"Where:\n\t"
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"-b The backend - \"file\", \"media\", \"x\", \"db\" or "
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"\"prop\"\n\t"
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"-v Validate entries against loaded policy.\n\t"
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"-r Use \"raw\" function.\n\t"
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"-k Lookup key - Depends on backend.\n\t"
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"-t Lookup type - Optional as depends on backend.\n\t"
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"-f Optional file containing the specs (defaults to\n\t"
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" those used by loaded policy).\n\n"
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"Examples:\n\t"
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"%s -v -b file -k /run -t 0\n\t"
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" lookup with validation against the loaded policy, the\n\t"
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" \"file\" backend for path \"/run\" with mode = 0\n\t"
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"%s -r -b x -t 4 -k X11:ButtonPress\n\t"
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" lookup_raw the \"X\" backend for type SELABEL_X_EVENT\n\t"
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" using key \"X11:ButtonPress\"\n\n",
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progname, progname, progname);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int raw = 0, type = 0, backend = 0, rc, opt;
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char *validate = NULL, *key = NULL, *context = NULL, *file = NULL;
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struct selabel_handle *hnd;
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struct selinux_opt selabel_option[] = {
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{ SELABEL_OPT_PATH, file },
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{ SELABEL_OPT_VALIDATE, validate }
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};
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if (argc < 3)
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usage(argv[0]);
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while ((opt = getopt(argc, argv, "b:f:vrk:t:")) > 0) {
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switch (opt) {
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case 'b':
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if (!strcasecmp(optarg, "file")) {
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backend = SELABEL_CTX_FILE;
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} else if (!strcmp(optarg, "media")) {
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backend = SELABEL_CTX_MEDIA;
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} else if (!strcmp(optarg, "x")) {
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backend = SELABEL_CTX_X;
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} else if (!strcmp(optarg, "db")) {
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backend = SELABEL_CTX_DB;
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} else if (!strcmp(optarg, "prop")) {
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backend = SELABEL_CTX_ANDROID_PROP;
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} else if (!strcmp(optarg, "service")) {
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backend = SELABEL_CTX_ANDROID_SERVICE;
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} else {
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fprintf(stderr, "Unknown backend: %s\n",
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optarg);
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usage(argv[0]);
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}
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break;
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case 'f':
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file = optarg;
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break;
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case 'v':
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validate = (char *)1;
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break;
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case 'r':
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raw = 1;
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break;
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case 'k':
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key = optarg;
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break;
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case 't':
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type = atoi(optarg);
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break;
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default:
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usage(argv[0]);
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}
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}
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selabel_option[0].value = file;
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selabel_option[1].value = validate;
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hnd = selabel_open(backend, selabel_option, 2);
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if (!hnd) {
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fprintf(stderr, "ERROR: selabel_open - Could not obtain "
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"handle: %s\n",
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strerror(errno));
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return -1;
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}
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switch (raw) {
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case 1:
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rc = selabel_lookup_raw(hnd, &context, key, type);
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break;
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default:
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rc = selabel_lookup(hnd, &context, key, type);
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}
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selabel_close(hnd);
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if (rc) {
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switch (errno) {
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case ENOENT:
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fprintf(stderr, "ERROR: selabel_lookup failed to "
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"find a valid context.\n");
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break;
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case EINVAL:
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fprintf(stderr, "ERROR: selabel_lookup failed to "
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"validate context, or key / type are "
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"invalid.\n");
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break;
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default:
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fprintf(stderr, "selabel_lookup ERROR: %s\n",
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strerror(errno));
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}
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} else {
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printf("Default context: %s\n", context);
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freecon(context);
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}
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return rc;
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}
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