Add SetPosition into WmediumdService

Bug: 273384914
Test: cvd env cvd-1 call WmediumdService SetPosition
"mac_address:'42:00:00:00:01:00' x_pos:100.0 y_pos:100.0" &&
wmediumd_control list_stations

Change-Id: I4229047e125191a051a7fbd629530a0beac224c1

3 files changed, 99 insertions, 18 deletions

diff --git a/wmediumd_server/wmediumd.proto b/wmediumd_server/wmediumd.proto
index c25b8c8..6939f7f 100644
--- a/wmediumd_server/wmediumd.proto
+++ b/wmediumd_server/wmediumd.proto
@@ -16,14 +16,15 @@ syntax = "proto3";
 
 package wmediumdserver;
 
+import "google/protobuf/empty.proto";
+
 service WmediumdService {
-  rpc Wmediumd (WmediumdRequest) returns (WmediumdReply) {}
+  // TODO(273384914): Define a response type.
+  rpc SetPosition (SetPositionRequest) returns (google.protobuf.Empty) {}
 }
 
-message WmediumdRequest {
-  string message = 1;
+message SetPositionRequest {
+  string mac_address = 1;
+  double x_pos = 2;
+  double y_pos = 3;
 }
-
-message WmediumdReply {
-  string message = 1;
-}
\ No newline at end of file
diff --git a/wmediumd_server/wmediumd_server.cc b/wmediumd_server/wmediumd_server.cc
index 48388d5..09b3283 100644
--- a/wmediumd_server/wmediumd_server.cc
+++ b/wmediumd_server/wmediumd_server.cc
@@ -16,36 +16,116 @@
  *
  */
 
+#include <algorithm>
+#include <array>
 #include <iostream>
 #include <memory>
 #include <string>
+#include <unistd.h>
 
+#include <android-base/strings.h>
 #include <gflags/gflags.h>
 #include <grpcpp/ext/proto_server_reflection_plugin.h>
 #include <grpcpp/grpcpp.h>
 #include <grpcpp/health_check_service_interface.h>
+#include <sys/msg.h>
 
+#include "wmediumd/api.h"
+#include "wmediumd/grpc.h"
 #include "wmediumd.grpc.pb.h"
 
-using wmediumdserver::WmediumdReply;
-using wmediumdserver::WmediumdRequest;
-using wmediumdserver::WmediumdService;
+using google::protobuf::Empty;
 using grpc::Server;
 using grpc::ServerBuilder;
 using grpc::ServerContext;
 using grpc::Status;
+using grpc::StatusCode;
+using wmediumdserver::SetPositionRequest;
+using wmediumdserver::WmediumdService;
 
-class WmediumdServiceImpl final : public WmediumdService::Service {
-  Status Wmediumd(ServerContext* context, const WmediumdRequest* request,
-              WmediumdReply* reply) override {
-    reply->set_message(request->message());
-    return Status::OK;
+#define MAC_ADDR_LEN 6
+#define STR_MAC_ADDR_LEN 17
+
+template <class T>
+static void AppendBinaryRepresentation(std::string& buf, const T& data) {
+  std::copy(reinterpret_cast<const char*>(&data),
+            reinterpret_cast<const char*>(&data) + sizeof(T),
+            std::back_inserter(buf));
+}
+
+bool IsValidMacAddr(const std::string& mac_address) {
+  if (mac_address.size() != STR_MAC_ADDR_LEN) {
+    return false;
   }
+
+  if (mac_address[2] != ':' || mac_address[5] != ':' || mac_address[8] != ':' ||
+      mac_address[11] != ':' || mac_address[14] != ':') {
+    return false;
+  }
+
+  for (int i = 0; i < STR_MAC_ADDR_LEN; ++i) {
+    if ((i - 2) % 3 == 0) continue;
+    char c = mac_address[i];
+
+    if (isupper(c)) {
+      c = tolower(c);
+    }
+
+    if ((c < '0' || c > '9') && (c < 'a' || c > 'f')) return false;
+  }
+
+  return true;
+}
+
+static std::array<uint8_t, 6> ParseMacAddress(const std::string& mac_address) {
+  auto split_mac = android::base::Split(mac_address, ":");
+  std::array<uint8_t, 6> mac;
+  for (int i = 0; i < 6; i++) {
+    char* end_ptr;
+    mac[i] = (uint8_t)strtol(split_mac[i].c_str(), &end_ptr, 16);
+  }
+
+  return mac;
+}
+
+class WmediumdServiceImpl final : public WmediumdService::Service {
+  public:
+    WmediumdServiceImpl(int event_fd, int msq_id) : event_fd_(event_fd), msq_id_(msq_id) {}
+
+    Status SetPosition(ServerContext* context, const SetPositionRequest* request,
+                Empty* reply) override {
+      // Validate parameters
+      if (!IsValidMacAddr(request->mac_address())) {
+        return Status(StatusCode::INVALID_ARGUMENT, "Got invalid mac address");
+      }
+      auto mac = ParseMacAddress(request->mac_address());
+
+      // Construct request data
+      struct wmediumd_set_position data;
+      memcpy(data.mac, &mac, sizeof(mac));
+      data.x = request->x_pos();
+      data.y = request->y_pos();
+
+      // Fill data in the message queue
+      struct wmediumd_grpc_message msg;
+      msg.type = GRPC_REQUEST;
+      memcpy(msg.data, &data, sizeof(data));
+      msgsnd(msq_id_, &msg, sizeof(data), 0);
+
+      // Throw an event to wmediumd
+      uint64_t value = REQUEST_SET_POSITION;
+      write(event_fd_, &value, sizeof(uint64_t));
+
+      return Status::OK;
+    }
+  private:
+    int event_fd_;
+    int msq_id_;
 };
 
-void RunWmediumdServer(std::string grpc_uds_path) {
+void RunWmediumdServer(std::string grpc_uds_path, int event_fd, int msq_id) {
   std::string server_address("unix:" + grpc_uds_path);
-  WmediumdServiceImpl service;
+  WmediumdServiceImpl service(event_fd, msq_id);
 
   grpc::EnableDefaultHealthCheckService(true);
   grpc::reflection::InitProtoReflectionServerBuilderPlugin();
diff --git a/wmediumd_server/wmediumd_server.h b/wmediumd_server/wmediumd_server.h
index 21e3c84..31761ac 100644
--- a/wmediumd_server/wmediumd_server.h
+++ b/wmediumd_server/wmediumd_server.h
@@ -16,4 +16,4 @@
  *
  */
 
-void RunWmediumdServer(std::string grpc_uds_path);
\ No newline at end of file
+void RunWmediumdServer(std::string grpc_uds_path, int event_fd, int msq_id);
\ No newline at end of file