Android(安卓)鐨勭郴缁熷睘鎬?SystemProperties)璁剧疆鍒嗘瀽
16lz
2021-01-25
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bionic / libc / include / sys / _system_properties.h
1 #define PROP_SERVICE_NAME"property_service"
2 #define PROP_PATH_RAMDISK_DEFAULT"/default.prop"
3 #define PROP_PATH_SYSTEM_BUILD"/system/build.prop"
4 #define PROP_PATH_SYSTEM_DEFAULT"/system/default.prop"
5 #define PROP_PATH_LOCAL_OVERRIDE"/data/local.prop"
鍚庤€呭垯閫氳繃frameworks/base/core/java/android/os/SystemProperties.java鐨勬帴鍙e畾涔夛紝
1 private static native Stringnative_get(Stringkey);
2 private static native Stringnative_get(Stringkey,Stringdef);
3 private static native void native_set(Stringkey,Stringdef);
4 public static void set(Stringkey,Stringval){
5 if (key.length() > PROP_NAME_MAX){
6 throw new IllegalArgumentException( " key.length> " + PROP_NAME_MAX);
7 }
8 if (val != null && val.length() > PROP_VALUE_MAX){
9 throw new IllegalArgumentException( " val.length> " +
10 PROP_VALUE_MAX);
11 }
12 native_set(key,val);
13 }
璇ユ帴鍙g被鍦ㄥ垵濮嬪寲杩愯鐜涓敞鍐屽搴旂殑cpp鎺ュ彛android_os_SystemProperties.cpp锛屽疄闄呮搷浣滈€氳繃JNI璋冪敤鐨勬槸cpp鏂囦欢瀵瑰簲鐨勬帴鍙o細
frameworks/base/core/jni/AndroidRuntime.cpp
1 namespace android{
2 extern int register_android_os_SystemProperties(JNIEnv * env);
3 }
frameworks/base/core/jni/android_os_SystemProperties.cpp
1 static void SystemProperties_set(JNIEnv * env,jobjectclazz,jstringkeyJ,jstringvalJ)
2 {
3 int err;
4 const char * key;
5 const char * val;
6 key = env -> GetStringUTFChars(keyJ,NULL);
7 if (valJ == NULL){
8 val = "" ; /* NULLpointernotallowedhere */
9 } else {
10 val = env -> GetStringUTFChars(valJ,NULL);
11 }
12 err = property_set(key,val);
13 env -> ReleaseStringUTFChars(keyJ,key);
14 if (valJ != NULL){
15 env -> ReleaseStringUTFChars(valJ,val);
16 }
17 }
璁剧疆key鐨剉alue鏃讹紝闇€瑕佷綔閴存潈锛屾牴鎹缃▼搴忔墍鍦ㄨ繘绋嬬殑fd鑾风煡uid鍊硷紝姣斿system server杩涚▼鍙互璁剧疆net鎵撳ご鐨刱ey锛屼笉鍙互璁剧疆gsm鎵撳ご鐨刱ey锛岀浉鍏崇殑瀹氫箟濡備笅锛?
system/core/include/private/android_filesystem_config.h
1 #define AID_ROOT0/*traditionalunixrootuser*/
2 #define AID_SYSTEM1000/*systemserver*/
3 #define AID_RADIO1001/*telephonysubsystem,RIL*/
4 #define AID_DHCP1014/*dhcpclient*/
5 #define AID_SHELL2000/*adbanddebugshelluser*/
6 #define AID_CACHE2001/*cacheaccess*/
7 #define AID_APP10000/*firstappuser*/
system/core/init/property_service.c
1 #define PERSISTENT_PROPERTY_DIR"/data/property"
2 struct {
3 const char * prefix;
4 unsigned int uid;
5 }property_perms[] = {
6 { " net.rmnet0. " ,AID_RADIO},
7 { " net.gprs. " ,AID_RADIO},
8 { " ril. " ,AID_RADIO},
9 { " gsm. " ,AID_RADIO},
10 { " net.dns " ,AID_RADIO},
11 { " net.usb0 " ,AID_RADIO},
12 { " net. " ,AID_SYSTEM},
13 { " dev. " ,AID_SYSTEM},
14 { " runtime. " ,AID_SYSTEM},
15 { " hw. " ,AID_SYSTEM},
16 { " sys. " ,AID_SYSTEM},
17 { " service. " ,AID_SYSTEM},
18 { " wlan. " ,AID_SYSTEM},
19 { " dhcp. " ,AID_SYSTEM},
20 { " dhcp. " ,AID_DHCP},
21 { " debug. " ,AID_SHELL},
22 { " log. " ,AID_SHELL},
23 { " service.adb.root " ,AID_SHELL},
24 { " persist.sys. " ,AID_SYSTEM},
25 { " persist.service. " ,AID_SYSTEM},
26 {NULL, 0 }
27 };
28 int property_set( const char * name, const char * value)
29 {
30 property_changed(name,value);
31 return 0 ;
32 }
33 int start_property_service( void )
34 {
35 int fd;
36
37 load_properties_from_file(PROP_PATH_SYSTEM_BUILD);
38 load_properties_from_file(PROP_PATH_SYSTEM_DEFAULT);
39 load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE);
40 /* Readpersistentpropertiesafteralldefaultvalueshavebeenloaded. */
41 load_persistent_properties();
42
43 fd = create_socket(PROP_SERVICE_NAME,SOCK_STREAM, 0666 , 0 , 0 );
44 if (fd < 0 ) return - 1 ;
45 fcntl(fd,F_SETFD,FD_CLOEXEC);
46 fcntl(fd,F_SETFL,O_NONBLOCK);
47
48 listen(fd, 8 );
49 return fd;
50 }
51 void handle_property_set_fd( int fd)
52 {
53 switch (msg.cmd){
54 case PROP_MSG_SETPROP:
55 msg.name[PROP_NAME_MAX - 1 ] = 0 ;
56 msg.value[PROP_VALUE_MAX - 1 ] = 0 ;
57
58 if (memcmp(msg.name, " ctl. " , 4 ) == 0 ){
59 if (check_control_perms(msg.value,cr.uid)){
60 handle_control_message(( char * )msg.name + 4 ,( char * )msg.value);
61 } else {
62 ERROR( " sys_prop:Unableto%sservicectl[%s]uid:%dpid:%d\n " ,
63 msg.name + 4 ,msg.value,cr.uid,cr.pid);
64 }
65 } else {
66 if (check_perms(msg.name,cr.uid)){
67 property_set(( char * )msg.name,( char * )msg.value);
68 } else {
69 ERROR( " sys_prop:permissiondenieduid:%dname:%s\n " ,
70 cr.uid,msg.name);
71 }
72 }
73 break ;
74
75 default :
76 break ;
77 }
78 }
鍦ㄥ紑鏈哄惎鍔ㄥ悗鐨刬nit鎿嶄綔涓紝浼氭墽琛屼竴涓猯oop寰幆锛屽綋妫€娴嬪埌鏈夋柊鐨勮缃椂锛岃繘鍏ヨ缃祦绋嬶紝閴存潈澶辫触浼氭彁绀虹浉鍏崇殑寮傚父锛屽sys_prop: permission denied uid:1000 name:gsm.phone.id
system/core/init/init.c
1 void property_changed( const char * name, const char * value)
2 {
3 if (property_triggers_enabled){
4 queue_property_triggers(name,value);
5 drain_action_queue();
6 }
7 }
8 int main( int argc, char ** argv)
9 {
10 parse_config_file( " /init.rc " );
11 qemu_init();
12 device_fd = device_init();
13 property_init();
14 fd = open(console_name,O_RDWR);
15 property_set_fd = start_property_service();
16 ufds[ 0 ].fd = device_fd;
17 ufds[ 0 ].events = POLLIN;
18 ufds[ 1 ].fd = property_set_fd;
19 ufds[ 1 ].events = POLLIN;
20 ufds[ 2 ].fd = signal_recv_fd;
21 ufds[ 2 ].events = POLLIN;
22 fd_count = 3 ;
23 for (;;){
24 if (ufds[ 0 ].revents == POLLIN)
25 handle_device_fd(device_fd);
26
27 if (ufds[ 1 ].revents == POLLIN)
28 handle_property_set_fd(property_set_fd);
29 if (ufds[ 3 ].revents == POLLIN)
30 handle_keychord(keychord_fd);
31 }
32 return 0 ;
33 }
bionic / libc / include / sys / _system_properties.h
1 #define PROP_SERVICE_NAME"property_service"
2 #define PROP_PATH_RAMDISK_DEFAULT"/default.prop"
3 #define PROP_PATH_SYSTEM_BUILD"/system/build.prop"
4 #define PROP_PATH_SYSTEM_DEFAULT"/system/default.prop"
5 #define PROP_PATH_LOCAL_OVERRIDE"/data/local.prop"
鍚庤€呭垯閫氳繃frameworks/base/core/java/android/os/SystemProperties.java鐨勬帴鍙e畾涔夛紝
1 private static native Stringnative_get(Stringkey);
2 private static native Stringnative_get(Stringkey,Stringdef);
3 private static native void native_set(Stringkey,Stringdef);
4 public static void set(Stringkey,Stringval){
5 if (key.length() > PROP_NAME_MAX){
6 throw new IllegalArgumentException( " key.length> " + PROP_NAME_MAX);
7 }
8 if (val != null && val.length() > PROP_VALUE_MAX){
9 throw new IllegalArgumentException( " val.length> " +
10 PROP_VALUE_MAX);
11 }
12 native_set(key,val);
13 }
璇ユ帴鍙g被鍦ㄥ垵濮嬪寲杩愯鐜涓敞鍐屽搴旂殑cpp鎺ュ彛android_os_SystemProperties.cpp锛屽疄闄呮搷浣滈€氳繃JNI璋冪敤鐨勬槸cpp鏂囦欢瀵瑰簲鐨勬帴鍙o細
frameworks/base/core/jni/AndroidRuntime.cpp
1 namespace android{
2 extern int register_android_os_SystemProperties(JNIEnv * env);
3 }
frameworks/base/core/jni/android_os_SystemProperties.cpp
1 static void SystemProperties_set(JNIEnv * env,jobjectclazz,jstringkeyJ,jstringvalJ)
2 {
3 int err;
4 const char * key;
5 const char * val;
6 key = env -> GetStringUTFChars(keyJ,NULL);
7 if (valJ == NULL){
8 val = "" ; /* NULLpointernotallowedhere */
9 } else {
10 val = env -> GetStringUTFChars(valJ,NULL);
11 }
12 err = property_set(key,val);
13 env -> ReleaseStringUTFChars(keyJ,key);
14 if (valJ != NULL){
15 env -> ReleaseStringUTFChars(valJ,val);
16 }
17 }
璁剧疆key鐨剉alue鏃讹紝闇€瑕佷綔閴存潈锛屾牴鎹缃▼搴忔墍鍦ㄨ繘绋嬬殑fd鑾风煡uid鍊硷紝姣斿system server杩涚▼鍙互璁剧疆net鎵撳ご鐨刱ey锛屼笉鍙互璁剧疆gsm鎵撳ご鐨刱ey锛岀浉鍏崇殑瀹氫箟濡備笅锛?
system/core/include/private/android_filesystem_config.h
1 #define AID_ROOT0/*traditionalunixrootuser*/
2 #define AID_SYSTEM1000/*systemserver*/
3 #define AID_RADIO1001/*telephonysubsystem,RIL*/
4 #define AID_DHCP1014/*dhcpclient*/
5 #define AID_SHELL2000/*adbanddebugshelluser*/
6 #define AID_CACHE2001/*cacheaccess*/
7 #define AID_APP10000/*firstappuser*/
system/core/init/property_service.c
1 #define PERSISTENT_PROPERTY_DIR"/data/property"
2 struct {
3 const char * prefix;
4 unsigned int uid;
5 }property_perms[] = {
6 { " net.rmnet0. " ,AID_RADIO},
7 { " net.gprs. " ,AID_RADIO},
8 { " ril. " ,AID_RADIO},
9 { " gsm. " ,AID_RADIO},
10 { " net.dns " ,AID_RADIO},
11 { " net.usb0 " ,AID_RADIO},
12 { " net. " ,AID_SYSTEM},
13 { " dev. " ,AID_SYSTEM},
14 { " runtime. " ,AID_SYSTEM},
15 { " hw. " ,AID_SYSTEM},
16 { " sys. " ,AID_SYSTEM},
17 { " service. " ,AID_SYSTEM},
18 { " wlan. " ,AID_SYSTEM},
19 { " dhcp. " ,AID_SYSTEM},
20 { " dhcp. " ,AID_DHCP},
21 { " debug. " ,AID_SHELL},
22 { " log. " ,AID_SHELL},
23 { " service.adb.root " ,AID_SHELL},
24 { " persist.sys. " ,AID_SYSTEM},
25 { " persist.service. " ,AID_SYSTEM},
26 {NULL, 0 }
27 };
28 int property_set( const char * name, const char * value)
29 {
30 property_changed(name,value);
31 return 0 ;
32 }
33 int start_property_service( void )
34 {
35 int fd;
36
37 load_properties_from_file(PROP_PATH_SYSTEM_BUILD);
38 load_properties_from_file(PROP_PATH_SYSTEM_DEFAULT);
39 load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE);
40 /* Readpersistentpropertiesafteralldefaultvalueshavebeenloaded. */
41 load_persistent_properties();
42
43 fd = create_socket(PROP_SERVICE_NAME,SOCK_STREAM, 0666 , 0 , 0 );
44 if (fd < 0 ) return - 1 ;
45 fcntl(fd,F_SETFD,FD_CLOEXEC);
46 fcntl(fd,F_SETFL,O_NONBLOCK);
47
48 listen(fd, 8 );
49 return fd;
50 }
51 void handle_property_set_fd( int fd)
52 {
53 switch (msg.cmd){
54 case PROP_MSG_SETPROP:
55 msg.name[PROP_NAME_MAX - 1 ] = 0 ;
56 msg.value[PROP_VALUE_MAX - 1 ] = 0 ;
57
58 if (memcmp(msg.name, " ctl. " , 4 ) == 0 ){
59 if (check_control_perms(msg.value,cr.uid)){
60 handle_control_message(( char * )msg.name + 4 ,( char * )msg.value);
61 } else {
62 ERROR( " sys_prop:Unableto%sservicectl[%s]uid:%dpid:%d\n " ,
63 msg.name + 4 ,msg.value,cr.uid,cr.pid);
64 }
65 } else {
66 if (check_perms(msg.name,cr.uid)){
67 property_set(( char * )msg.name,( char * )msg.value);
68 } else {
69 ERROR( " sys_prop:permissiondenieduid:%dname:%s\n " ,
70 cr.uid,msg.name);
71 }
72 }
73 break ;
74
75 default :
76 break ;
77 }
78 }
鍦ㄥ紑鏈哄惎鍔ㄥ悗鐨刬nit鎿嶄綔涓紝浼氭墽琛屼竴涓猯oop寰幆锛屽綋妫€娴嬪埌鏈夋柊鐨勮缃椂锛岃繘鍏ヨ缃祦绋嬶紝閴存潈澶辫触浼氭彁绀虹浉鍏崇殑寮傚父锛屽sys_prop: permission denied uid:1000 name:gsm.phone.id
system/core/init/init.c
1 void property_changed( const char * name, const char * value)
2 {
3 if (property_triggers_enabled){
4 queue_property_triggers(name,value);
5 drain_action_queue();
6 }
7 }
8 int main( int argc, char ** argv)
9 {
10 parse_config_file( " /init.rc " );
11 qemu_init();
12 device_fd = device_init();
13 property_init();
14 fd = open(console_name,O_RDWR);
15 property_set_fd = start_property_service();
16 ufds[ 0 ].fd = device_fd;
17 ufds[ 0 ].events = POLLIN;
18 ufds[ 1 ].fd = property_set_fd;
19 ufds[ 1 ].events = POLLIN;
20 ufds[ 2 ].fd = signal_recv_fd;
21 ufds[ 2 ].events = POLLIN;
22 fd_count = 3 ;
23 for (;;){
24 if (ufds[ 0 ].revents == POLLIN)
25 handle_device_fd(device_fd);
26
27 if (ufds[ 1 ].revents == POLLIN)
28 handle_property_set_fd(property_set_fd);
29 if (ufds[ 3 ].revents == POLLIN)
30 handle_keychord(keychord_fd);
31 }
32 return 0 ;
33 }
OVER锛?/p>
http://www.blogjava.net/anymobile/articles/301989.html
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