DO NOT MERGE Add support for EFF/RTR to canhalsend
Adding support for extended format frames and remote transmission
request frames to canhalsend.
Bug: 149404884
Test: Manual
Merged-In: I330b9d24c34918b38612ddc1745f019e11bfd474
Change-Id: I330b9d24c34918b38612ddc1745f019e11bfd474
(cherry picked from commit 30bd3dce06e3f20f2bb20473099b8350f1d4cacc)
diff --git a/automotive/can/1.0/tools/canhalsend.cpp b/automotive/can/1.0/tools/canhalsend.cpp
index 7e6833a..18e815d 100644
--- a/automotive/can/1.0/tools/canhalsend.cpp
+++ b/automotive/can/1.0/tools/canhalsend.cpp
@@ -15,6 +15,8 @@
*/
#include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/strings.h>
#include <android/hardware/automotive/can/1.0/ICanBus.h>
#include <android/hidl/manager/1.2/IServiceManager.h>
@@ -27,13 +29,13 @@
using Result = V1_0::Result;
static void usage() {
- std::cerr << "cansend - simple command line tool to send raw CAN frames" << std::endl;
+ std::cerr << "canhalsend - simple command line tool to send raw CAN frames" << std::endl;
std::cerr << std::endl << "usage:" << std::endl << std::endl;
std::cerr << "canhalsend <bus name> <can id>#<data>" << std::endl;
std::cerr << "where:" << std::endl;
- std::cerr << " bus name - name under which ICanBus is be published" << std::endl;
- std::cerr << " can id - such as 1a5" << std::endl;
- std::cerr << " data - such as deadbeef or 010203" << std::endl;
+ std::cerr << " bus name - name under which ICanBus is published" << std::endl;
+ std::cerr << " can id - such as 1a5 or 1fab5982" << std::endl;
+ std::cerr << " data - such as deadbeef, 010203, or R for a remote frame" << std::endl;
}
// TODO(b/135918744): extract to a new library
@@ -53,18 +55,13 @@
return ICanBus::castFrom(ret);
}
-static int cansend(const std::string& busname, V1_0::CanMessageId msgid,
- std::vector<uint8_t> payload) {
+static int cansend(const std::string& busname, const V1_0::CanMessage& msg) {
auto bus = tryOpen(busname);
if (bus == nullptr) {
std::cerr << "Bus " << busname << " is not available" << std::endl;
return -1;
}
- V1_0::CanMessage msg = {};
- msg.id = msgid;
- msg.payload = payload;
-
const auto result = bus->send(msg);
if (result != Result::OK) {
std::cerr << "Send call failed: " << toString(result) << std::endl;
@@ -73,8 +70,7 @@
return 0;
}
-static std::optional<std::tuple<V1_0::CanMessageId, std::vector<uint8_t>>> parseCanMessage(
- const std::string& msg) {
+static std::optional<V1_0::CanMessage> parseCanMessage(const std::string& msg) {
const auto hashpos = msg.find("#");
if (hashpos == std::string::npos) return std::nullopt;
@@ -85,6 +81,32 @@
V1_0::CanMessageId msgid = std::stoi(msgidStr, &idx, 16);
if (msgidStr[idx] != '\0') return std::nullopt;
+ V1_0::CanMessage canmsg = {};
+ canmsg.id = msgid;
+ if (msgid > 0x7FF) {
+ canmsg.isExtendedId = true;
+ }
+
+ if (android::base::StartsWith(payloadStr, "R")) {
+ canmsg.remoteTransmissionRequest = true;
+
+ /* The CAN bus HAL doesn't define a data length code (DLC) field, since it is inferrred
+ * from the payload size. RTR messages indicate to the receiver how many bytes they are
+ * expecting to receive back via the DLC sent with the RTR frame. */
+ if (payloadStr.size() <= 1) return canmsg;
+
+ unsigned int dlc = 0;
+
+ /* The maximum DLC for CAN-FD is 64 bytes and CAN 2.0 is 8 bytes. Limit the size of the DLC
+ * to something memory safe and let the HAL determine if the DLC is valid. */
+ if (!android::base::ParseUint(payloadStr.substr(1), &dlc, 10000u)) {
+ std::cerr << "Invalid DLC for RTR frame!" << std::endl;
+ return std::nullopt;
+ }
+ canmsg.payload.resize(dlc);
+ return canmsg;
+ }
+
std::vector<uint8_t> payload;
if (payloadStr.size() % 2 != 0) return std::nullopt;
for (size_t i = 0; i < payloadStr.size(); i += 2) {
@@ -92,8 +114,9 @@
payload.emplace_back(std::stoi(byteStr, &idx, 16));
if (byteStr[idx] != '\0') return std::nullopt;
}
+ canmsg.payload = payload;
- return {{msgid, payload}};
+ return canmsg;
}
static int main(int argc, char* argv[]) {
@@ -117,9 +140,8 @@
std::cerr << "Failed to parse CAN message argument" << std::endl;
return -1;
}
- const auto [msgid, payload] = *canmsg;
- return cansend(busname, msgid, payload);
+ return cansend(busname, *canmsg);
}
} // namespace android::hardware::automotive::can