Android培训班(40)
<!--@page { margin: 2cm }P { margin-bottom: 0.21cm }-->在init.rc文件里，可以看到加载下面的服务：
servicekeystore /system/bin/keystore /data/misc/keystore
userkeystore
groupkeystore
socketkeystore stream 666
keystore服务的代码在目录：
Android-2.0/frameworks/base/cmds/keystore
keystore服务是加解密储存键值的服务。它主要作用就是验证应用程序与签名文件是否一致。
它的主要入口函数代码如下：
intmain(int argc, char **argv)
{
获取加密服务的SOCKET。
intcontrol_socket = android_get_control_socket("keystore");
if(argc < 2) {
LOGE("Adirectory must be specified!");
return1;
}
if(chdir(argv) == -1) {
LOGE("chdir: %s: %s", argv,strerror(errno));
return1;
}
if((the_entropy = open(RANDOM_DEVICE, O_RDONLY)) == -1) {
LOGE("open: %s: %s",RANDOM_DEVICE, strerror(errno));
return1;
}
监听这个服务。
if(listen(control_socket, 3) == -1) {
LOGE("listen: %s",strerror(errno));
return1;
}
signal(SIGPIPE, SIG_IGN);
if(access(MASTER_KEY_FILE, R_OK) == 0) {
state= LOCKED;
}
接收到连接。
while((the_socket = accept(control_socket, NULL, 0)) != -1) {
structtimeval tv = {.tv_sec = 3};
structucred cred;
socklen_tsize = sizeof(cred);
int8_trequest;
setsockopt(the_socket, SOL_SOCKET,SO_RCVTIMEO, &tv, sizeof(tv));
setsockopt(the_socket, SOL_SOCKET,SO_SNDTIMEO, &tv, sizeof(tv));
if(getsockopt(the_socket, SOL_SOCKET, SO_PEERCRED, &cred, &size)){
LOGW("getsockopt: %s",strerror(errno));
}else if (recv_code(&request)) {
接收到请求后，就开始进行加密验证处理。
int8_told_state = state;
int8_tresponse;
uid= cred.uid;
if((response = process(request)) > 0) {
send_code(response);
response = -response;
}
LOGI("uid: %d action: %c -> %dstate: %d -> %d retry: %d",
cred.uid, request, -response, old_state,state, retry);
}
close(the_socket);
}
LOGE("accept:%s", strerror(errno));
return1;
}
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