1 #include <unistd.h>
2 #include <fcntl.h>
3 #include <sys/stat.h>
4 #include <string.h>
5 #include "selinux_internal.h"
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <ctype.h>
9 #include <errno.h>
10 #include <limits.h>
11 #include <regex.h>
12 #include <stdarg.h>
13 
matchmediacon(const char * media,char ** con)14 int matchmediacon(const char *media, char ** con)
15 {
16 	const char *path = selinux_media_context_path();
17 	FILE *infile;
18 	char *ptr, *ptr2 = NULL;
19 	int found = 0;
20 	char current_line[PATH_MAX];
21 	if ((infile = fopen(path, "r")) == NULL)
22 		return -1;
23 	while (!feof_unlocked(infile)) {
24 		if (!fgets_unlocked(current_line, sizeof(current_line), infile)) {
25 			return -1;
26 		}
27 		if (current_line[strlen(current_line) - 1])
28 			current_line[strlen(current_line) - 1] = 0;
29 		/* Skip leading whitespace before the partial context. */
30 		ptr = current_line;
31 		while (*ptr && isspace(*ptr))
32 			ptr++;
33 
34 		if (!(*ptr))
35 			continue;
36 
37 		/* Find the end of the media context. */
38 		ptr2 = ptr;
39 		while (*ptr2 && !isspace(*ptr2))
40 			ptr2++;
41 		if (!(*ptr2))
42 			continue;
43 
44 		*ptr2++ = 0;
45 		if (strcmp(media, ptr) == 0) {
46 			found = 1;
47 			break;
48 		}
49 	}
50 	fclose(infile);
51 	if (!found)
52 		return -1;
53 
54 	/* Skip whitespace. */
55 	while (*ptr2 && isspace(*ptr2))
56 		ptr2++;
57 	if (!(*ptr2)) {
58 		return -1;
59 	}
60 
61 	if (selinux_raw_to_trans_context(ptr2, con)) {
62 		*con = NULL;
63 		return -1;
64 	}
65 
66 	return 0;
67 }
68