1 /* getprop.c - Get an Android system property
2 *
3 * Copyright 2015 The Android Open Source Project
4
5 USE_GETPROP(NEWTOY(getprop, ">2Z", TOYFLAG_USR|TOYFLAG_SBIN))
6
7 config GETPROP
8 bool "getprop"
9 default y
10 depends on TOYBOX_ON_ANDROID
11 help
12 usage: getprop [NAME [DEFAULT]]
13
14 Gets an Android system property, or lists them all.
15 */
16
17 #define FOR_getprop
18 #include "toys.h"
19
20 #if defined(__ANDROID__)
21
22 #include <cutils/properties.h>
23
24 #include <selinux/android.h>
25 #include <selinux/label.h>
26 #include <selinux/selinux.h>
27
GLOBALS(size_t size;char ** nv;struct selabel_handle * handle;)28 GLOBALS(
29 size_t size;
30 char **nv; // name/value pairs: even=name, odd=value
31 struct selabel_handle *handle;
32 )
33
34 static char *get_property_context(char *property)
35 {
36 char *context = NULL;
37
38 if (selabel_lookup(TT.handle, &context, property, 1)) {
39 perror_exit("unable to lookup label for \"%s\"", property);
40 }
41 return context;
42 }
43
add_property(char * name,char * value,void * unused)44 static void add_property(char *name, char *value, void *unused)
45 {
46 if (!(TT.size&31)) TT.nv = xrealloc(TT.nv, (TT.size+32)*2*sizeof(char *));
47
48 TT.nv[2*TT.size] = xstrdup(name);
49 if (toys.optflags & FLAG_Z) {
50 TT.nv[1+2*TT.size++] = get_property_context(name);
51 } else {
52 TT.nv[1+2*TT.size++] = xstrdup(value);
53 }
54 }
55
56 // Needed to supress extraneous "Loaded property_contexts from" message
selinux_log_callback(int type,const char * fmt,...)57 int selinux_log_callback(int type, const char *fmt, ...) {
58 va_list ap;
59
60 if (type == SELINUX_INFO) return 0;
61 va_start(ap, fmt);
62 verror_msg(fmt, 0, ap);
63 va_end(ap);
64 return 0;
65 }
66
getprop_main(void)67 void getprop_main(void)
68 {
69 if (toys.optflags & FLAG_Z) {
70 union selinux_callback cb;
71
72 cb.func_log = selinux_log_callback;
73 selinux_set_callback(SELINUX_CB_LOG, cb);
74 TT.handle = selinux_android_prop_context_handle();
75 if (!TT.handle) error_exit("unable to get selinux property context handle");
76 }
77
78 if (*toys.optargs) {
79 if (toys.optflags & FLAG_Z) {
80 char *context = get_property_context(*toys.optargs);
81
82 puts(context);
83 if (CFG_TOYBOX_FREE) free(context);
84 } else {
85 property_get(*toys.optargs, toybuf, toys.optargs[1] ? toys.optargs[1] : "");
86 puts(toybuf);
87 }
88 } else {
89 size_t i;
90
91 if (property_list((void *)add_property, 0)) error_exit("property_list");
92 qsort(TT.nv, TT.size, 2*sizeof(char *), qstrcmp);
93 for (i = 0; i<TT.size; i++) printf("[%s]: [%s]\n", TT.nv[i*2],TT.nv[1+i*2]);
94 if (CFG_TOYBOX_FREE) {
95 for (i = 0; i<TT.size; i++) {
96 free(TT.nv[i*2]);
97 free(TT.nv[1+i*2]);
98 }
99 free(TT.nv);
100 }
101 }
102 if (CFG_TOYBOX_FREE && (toys.optflags & FLAG_Z)) selabel_close(TT.handle);
103 }
104
105 #else
106
getprop_main(void)107 void getprop_main(void)
108 {
109 }
110
111 #endif
112