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/* getprop.c - Get an Android system property
*
* Copyright 2015 The Android Open Source Project
USE_GETPROP(NEWTOY(getprop, ">2Z", TOYFLAG_USR|TOYFLAG_SBIN))
config GETPROP
bool "getprop"
default y
depends on TOYBOX_ON_ANDROID && TOYBOX_SELINUX
help
usage: getprop [NAME [DEFAULT]]
Gets an Android system property, or lists them all.
*/
#define FOR_getprop
#include "toys.h"
#include <sys/system_properties.h>
#include <selinux/android.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
GLOBALS(
size_t size;
char **nv; // name/value pairs: even=name, odd=value
struct selabel_handle *handle;
)
static char *get_property_context(const char *property)
{
char *context = NULL;
if (selabel_lookup(TT.handle, &context, property, 1)) {
perror_exit("unable to lookup label for \"%s\"", property);
}
return context;
}
static void read_callback(void *unused, const char *name, const char *value,
unsigned serial)
{
if (!(TT.size&31)) TT.nv = xrealloc(TT.nv, (TT.size+32)*2*sizeof(char *));
TT.nv[2*TT.size] = xstrdup((char *)name);
if (toys.optflags & FLAG_Z) {
TT.nv[1+2*TT.size++] = get_property_context(name);
} else {
TT.nv[1+2*TT.size++] = xstrdup((char *)value);
}
}
static void add_property(const prop_info *pi, void *unused)
{
__system_property_read_callback(pi, read_callback, NULL);
}
static void print_callback(void *unused, const char *unused_name, const char *value,
unsigned unused_serial)
{
puts(value);
}
// Needed to supress extraneous "Loaded property_contexts from" message
static int selinux_log_callback_local(int type, const char *fmt, ...)
{
va_list ap;
if (type == SELINUX_INFO) return 0;
va_start(ap, fmt);
verror_msg((char *)fmt, 0, ap);
va_end(ap);
return 0;
}
void getprop_main(void)
{
if (toys.optflags & FLAG_Z) {
union selinux_callback cb;
cb.func_log = selinux_log_callback_local;
selinux_set_callback(SELINUX_CB_LOG, cb);
TT.handle = selinux_android_prop_context_handle();
if (!TT.handle) error_exit("unable to get selinux property context handle");
}
if (*toys.optargs) {
if (toys.optflags & FLAG_Z) {
char *context = get_property_context(*toys.optargs);
puts(context);
if (CFG_TOYBOX_FREE) free(context);
} else {
const prop_info* pi = __system_property_find(*toys.optargs);
if (pi == NULL) {
puts(toys.optargs[1] ? toys.optargs[1] : "");
} else {
__system_property_read_callback(pi, print_callback, NULL);
}
}
} else {
size_t i;
if (__system_property_foreach(add_property, NULL))
error_exit("property_list");
qsort(TT.nv, TT.size, 2*sizeof(char *), qstrcmp);
for (i = 0; i<TT.size; i++) printf("[%s]: [%s]\n", TT.nv[i*2],TT.nv[1+i*2]);
if (CFG_TOYBOX_FREE) {
for (i = 0; i<TT.size; i++) {
free(TT.nv[i*2]);
free(TT.nv[1+i*2]);
}
free(TT.nv);
}
}
if (CFG_TOYBOX_FREE && (toys.optflags & FLAG_Z)) selabel_close(TT.handle);
}
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