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
setprop_main(void)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)
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