1/* setprop.c - Set an Android system property
2 *
3 * Copyright 2015 The Android Open Source Project
4
5USE_SETPROP(NEWTOY(setprop, "<2>2", TOYFLAG_USR|TOYFLAG_SBIN))
6
7config 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
22void 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