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https://github.com/topjohnwu/Magisk.git
synced 2026-10-08 06:05:21 -04:00
351 lines
10 KiB
C++
351 lines
10 KiB
C++
#include <dlfcn.h>
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#include <sys/types.h>
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#include <vector>
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#include <map>
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#include <resetprop.hpp>
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#include <base.hpp>
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#include "prop.hpp"
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using namespace std;
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#ifdef APPLET_STUB_MAIN
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#define system_property_set __system_property_set
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#define system_property_find __system_property_find
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#define system_property_read_callback __system_property_read_callback
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#define system_property_foreach __system_property_foreach
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#define system_property_read(...)
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#else
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static int (*system_property_set)(const char*, const char*);
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static int (*system_property_read)(const prop_info*, char*, char*);
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static const prop_info *(*system_property_find)(const char*);
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static void (*system_property_read_callback)(
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const prop_info*, void (*)(void*, const char*, const char*, uint32_t), void*);
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static int (*system_property_foreach)(void (*)(const prop_info*, void*), void*);
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#endif
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struct PropFlags {
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void setSkipSvc() { flags |= 1; }
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void setPersist() { flags |= (1 << 1); }
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void setContext() { flags |= (1 << 2); }
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void setDelete() { flags |= (1 << 3); }
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void setLoadFile() { flags |= (1 << 4); }
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bool isSkipSvc() const { return flags & 1; }
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bool isPersist() const { return flags & (1 << 1); }
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bool isContext() const { return flags & (1 << 2); }
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bool isDelete() const { return flags & (1 << 3); }
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bool isLoadFile() const { return flags & (1 << 4); }
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private:
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uint32_t flags = 0;
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};
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[[noreturn]] static void usage(char* arg0) {
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fprintf(stderr,
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R"EOF(resetprop - System Property Manipulation Tool
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Usage: %s [flags] [options...]
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Options:
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-h, --help show this message
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(no arguments) print all properties
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NAME get property
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NAME VALUE set property entry NAME with VALUE
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--file FILE load props from FILE
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--delete NAME delete property
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Flags:
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-v print verbose output to stderr
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-n set props without going through property_service
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(this flag only affects setprop)
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-p read/write props from/to persistent storage
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(this flag only affects getprop and delprop)
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-Z show property contexts instead of values
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(this flag only affects getprop)
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)EOF", arg0);
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exit(1);
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}
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static bool check_legal_property_name(const char *name) {
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int namelen = strlen(name);
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if (namelen < 1) goto illegal;
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if (name[0] == '.') goto illegal;
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if (name[namelen - 1] == '.') goto illegal;
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/* Only allow alphanumeric, plus '.', '-', '@', ':', or '_' */
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/* Don't allow ".." to appear in a property name */
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for (size_t i = 0; i < namelen; i++) {
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if (name[i] == '.') {
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// i=0 is guaranteed to never have a dot. See above.
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if (name[i-1] == '.') goto illegal;
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continue;
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}
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if (name[i] == '_' || name[i] == '-' || name[i] == '@' || name[i] == ':') continue;
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if (name[i] >= 'a' && name[i] <= 'z') continue;
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if (name[i] >= 'A' && name[i] <= 'Z') continue;
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if (name[i] >= '0' && name[i] <= '9') continue;
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goto illegal;
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}
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return true;
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illegal:
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LOGE("Illegal property name: [%s]\n", name);
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return false;
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}
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static void read_prop_with_cb(const prop_info *pi, void *cb) {
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if (system_property_read_callback) {
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auto callback = [](void *cb, const char *name, const char *value, uint32_t) {
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static_cast<prop_cb*>(cb)->exec(name, value);
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};
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system_property_read_callback(pi, callback, cb);
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} else {
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char name[PROP_NAME_MAX];
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char value[PROP_VALUE_MAX];
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name[0] = '\0';
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value[0] = '\0';
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system_property_read(pi, name, value);
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static_cast<prop_cb*>(cb)->exec(name, value);
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}
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}
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struct prop_to_string : prop_cb {
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explicit prop_to_string(string &s) : val(s) {}
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void exec(const char *, const char *value) override {
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val = value;
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}
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private:
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string &val;
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};
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static int set_prop(const char *name, const char *value, PropFlags flags) {
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if (!check_legal_property_name(name))
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return 1;
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const char *msg = flags.isSkipSvc() ? "modifying prop data structure" : "property_service";
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auto pi = const_cast<prop_info *>(__system_property_find(name));
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// Always delete existing read-only properties, because they could be
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// long properties and cannot directly go through __system_property_update
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if (pi != nullptr && str_starts(name, "ro.")) {
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// Skip pruning nodes as we will add it back ASAP
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__system_property_delete(name, false);
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pi = nullptr;
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}
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int ret;
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if (pi != nullptr) {
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if (flags.isSkipSvc()) {
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ret = __system_property_update(pi, value, strlen(value));
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} else {
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ret = system_property_set(name, value);
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}
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LOGD("resetprop: update prop [%s]: [%s] by %s\n", name, value, msg);
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} else {
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if (flags.isSkipSvc()) {
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ret = __system_property_add(name, strlen(name), value, strlen(value));
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} else {
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ret = system_property_set(name, value);
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}
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LOGD("resetprop: create prop [%s]: [%s] by %s\n", name, value, msg);
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}
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if (ret)
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LOGW("resetprop: setprop error\n");
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return ret;
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}
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static string get_prop(const char *name, PropFlags flags) {
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if (!check_legal_property_name(name))
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return "";
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if (flags.isContext()) {
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auto val = __system_property_get_context(name) ?: "";
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LOGD("resetprop: getcontext [%s]: [%s]\n", name, val);
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return val;
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}
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string val;
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auto pi = system_property_find(name);
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if (pi == nullptr)
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return val;
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auto cb = prop_to_string(val);
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read_prop_with_cb(pi, &cb);
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LOGD("resetprop: getprop [%s]: [%s]\n", name, val.data());
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if (val.empty() && flags.isPersist() && strncmp(name, "persist.", 8) == 0)
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val = persist_getprop(name);
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if (val.empty())
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LOGD("resetprop: prop [%s] does not exist\n", name);
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return val;
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}
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static void print_props(PropFlags flags) {
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prop_list list;
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prop_collector collector(list);
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system_property_foreach(read_prop_with_cb, &collector);
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if (flags.isPersist())
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persist_getprops(&collector);
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for (auto &[key, val] : list) {
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const char *v = flags.isContext() ?
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(__system_property_get_context(key.data()) ?: "") :
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val.data();
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printf("[%s]: [%s]\n", key.data(), v);
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}
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}
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static int delete_prop(const char *name, PropFlags flags) {
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LOGD("resetprop: delete prop [%s]\n", name);
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int ret = __system_property_delete(name, true);
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if (flags.isPersist() && str_starts(name, "persist.")) {
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if (persist_deleteprop(name))
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ret = 0;
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}
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return ret;
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}
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static void load_file(const char *filename, PropFlags flags) {
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LOGD("resetprop: Parse prop file [%s]\n", filename);
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parse_prop_file(filename, [=](auto key, auto val) -> bool {
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set_prop(key.data(), val.data(), flags);
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return true;
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});
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}
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struct Initialize {
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Initialize() {
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#ifndef APPLET_STUB_MAIN
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#define DLOAD(name) (*(void **) &name = dlsym(RTLD_DEFAULT, "__" #name))
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// Load platform implementations
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DLOAD(system_property_set);
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DLOAD(system_property_read);
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DLOAD(system_property_find);
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DLOAD(system_property_read_callback);
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DLOAD(system_property_foreach);
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#undef DLOAD
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#endif
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if (__system_properties_init()) {
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LOGE("resetprop: __system_properties_init error\n");
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}
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}
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};
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static void InitOnce() {
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struct Initialize init;
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}
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int resetprop_main(int argc, char *argv[]) {
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PropFlags flags;
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char *argv0 = argv[0];
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--argc;
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++argv;
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// Parse flags and -- options
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while (argc && argv[0][0] == '-') {
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for (int idx = 1; true; ++idx) {
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switch (argv[0][idx]) {
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case '-':
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if (argv[0] == "--file"sv) {
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flags.setLoadFile();
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} else if (argv[0] == "--delete"sv) {
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flags.setDelete();
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} else if (argv[0] == "--help"sv) {
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usage(argv0);
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}
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break;
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case 'v':
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set_log_level_state(LogLevel::Debug, true);
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continue;
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case 'p':
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flags.setPersist();
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continue;
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case 'n':
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flags.setSkipSvc();
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continue;
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case 'Z':
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flags.setContext();
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continue;
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case '\0':
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break;
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case 'h':
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default:
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usage(argv0);
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}
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break;
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}
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--argc;
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++argv;
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}
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InitOnce();
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if (flags.isDelete()) {
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if (argc != 1)
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usage(argv0);
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return delete_prop(argv[0], flags);
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}
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if (flags.isLoadFile()) {
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if (argc != 1)
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usage(argv0);
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load_file(argv[0], flags);
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return 0;
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}
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switch (argc) {
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case 0:
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print_props(flags);
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return 0;
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case 1: {
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string val = get_prop(argv[0], flags);
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if (val.empty())
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return 1;
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printf("%s\n", val.data());
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return 0;
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}
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case 2:
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return set_prop(argv[0], argv[1], flags);
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default:
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usage(argv0);
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}
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}
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/***********************************
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* Implementation of top-level APIs
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***********************************/
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string get_prop(const char *name, bool persist) {
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InitOnce();
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PropFlags flags;
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if (persist) flags.setPersist();
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return get_prop(name, flags);
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}
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int delete_prop(const char *name, bool persist) {
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InitOnce();
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PropFlags flags;
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if (persist) flags.setPersist();
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return delete_prop(name, flags);
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}
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int set_prop(const char *name, const char *value, bool skip_svc) {
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InitOnce();
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PropFlags flags;
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if (skip_svc) flags.setSkipSvc();
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return set_prop(name, value, flags);
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}
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void load_prop_file(const char *filename, bool skip_svc) {
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InitOnce();
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PropFlags flags;
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if (skip_svc) flags.setSkipSvc();
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load_file(filename, flags);
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}
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