1 /* setprop.c - Set an Android system property
2  *
3  * Copyright 2015 The Android Open Source Project
4 
5 USE_SETPROP(NEWTOY(setprop, "<2>2", TOYFLAG_USR|TOYFLAG_SBIN))
6 
7 config SETPROP
8   bool "setprop"
9   default y
10   depends on TOYBOX_ON_ANDROID
11   help
12     usage: setprop NAME VALUE
13 
14     Sets an Android system property.
15 */
16 
17 #define FOR_setprop
18 #include "toys.h"
19 
20 #include <sys/system_properties.h>
21 
22 void setprop_main(void)
23 {
24   char *name = toys.optargs[0], *value = toys.optargs[1];
25   char *p;
26   size_t name_len = strlen(name), value_len = strlen(value);
27 
28   // property_set doesn't tell us why it failed, and actually can't
29   // recognize most failures (because it doesn't wait for init), so
30   // we duplicate all of init's checks here to help the user.
31 
32   if (value_len >= PROP_VALUE_MAX && !strncmp(value, "ro.", 3))
33     error_exit("value '%s' too long; try '%.*s'",
34                value, PROP_VALUE_MAX - 1, value);
35 
36   if (*name == '.' || name[name_len - 1] == '.')
37     error_exit("property names must not start or end with '.'");
38   if (strstr(name, ".."))
39     error_exit("'..' is not allowed in a property name");
40   for (p = name; *p; ++p)
41     if (!isalnum(*p) && !strchr(":@_.-", *p))
42       error_exit("invalid character '%c' in name '%s'", *p, name);
43 
44   if (__system_property_set(name, value))
45     error_msg("failed to set property '%s' to '%s'", name, value);
46 }
47