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/*
* Copyright 2021, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "TrustyApp.h"
#include <BufferAllocator/BufferAllocator.h>
#include <android-base/logging.h>
#include <sys/mman.h>
#include <sys/uio.h>
#include <trusty/tipc.h>
#define countof(arr) (sizeof(arr) / sizeof(arr[0]))
namespace android {
namespace trusty {
namespace confirmationui {
using ::android::base::unique_fd;
static inline uintptr_t RoundPageUp(uintptr_t val) {
return (val + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
}
ssize_t TrustyApp::TrustyRpc(const uint8_t* obegin, const uint8_t* oend, uint8_t* ibegin,
uint8_t* iend) {
uint32_t olen = oend - obegin;
if (olen > shm_len_) {
LOG(ERROR) << AT << "request message too long to fit in shared memory";
return -1;
}
memcpy(shm_base_, obegin, olen);
confirmationui_hdr hdr = {
.cmd = CONFIRMATIONUI_CMD_MSG,
};
confirmationui_msg_args args = {
.msg_len = olen,
};
iovec iov[] = {
{
.iov_base = &hdr,
.iov_len = sizeof(hdr),
},
{
.iov_base = &args,
.iov_len = sizeof(args),
},
};
int rc = tipc_send(handle_, iov, countof(iov), NULL, 0);
if (rc != static_cast<int>(sizeof(hdr) + sizeof(args))) {
LOG(ERROR) << AT << "failed to send MSG request";
return -1;
}
rc = readv(handle_, iov, countof(iov));
if (rc != static_cast<int>(sizeof(hdr) + sizeof(args))) {
LOG(ERROR) << AT << "failed to receive MSG response";
return -1;
}
if (hdr.cmd != (CONFIRMATIONUI_CMD_MSG | CONFIRMATIONUI_RESP_BIT)) {
LOG(ERROR) << AT << "unknown response command: " << hdr.cmd;
return -1;
}
uint32_t ilen = iend - ibegin;
if (args.msg_len > ilen) {
LOG(ERROR) << AT << "response message too long to fit in return buffer";
return -1;
}
memcpy(ibegin, shm_base_, args.msg_len);
return args.msg_len;
}
TrustyApp::TrustyApp(const std::string& path, const std::string& appname)
: handle_(kInvalidHandle) {
unique_fd tipc_handle(tipc_connect(path.c_str(), appname.c_str()));
if (tipc_handle < 0) {
LOG(ERROR) << AT << "failed to connect to Trusty TA \"" << appname << "\" using dev:"
<< "\"" << path << "\"";
return;
}
uint32_t shm_len = RoundPageUp(CONFIRMATIONUI_MAX_MSG_SIZE);
BufferAllocator allocator;
unique_fd dma_buf(allocator.Alloc("system", shm_len));
if (dma_buf < 0) {
LOG(ERROR) << AT << "failed to allocate shared memory buffer";
return;
}
confirmationui_hdr hdr = {
.cmd = CONFIRMATIONUI_CMD_INIT,
};
confirmationui_init_req args = {
.shm_len = shm_len,
};
iovec iov[] = {
{
.iov_base = &hdr,
.iov_len = sizeof(hdr),
},
{
.iov_base = &args,
.iov_len = sizeof(args),
},
};
trusty_shm shm = {
.fd = dma_buf,
.transfer = TRUSTY_SHARE,
};
int rc = tipc_send(tipc_handle, iov, 2, &shm, 1);
if (rc != static_cast<int>(sizeof(hdr) + sizeof(args))) {
LOG(ERROR) << AT << "failed to send INIT request";
return;
}
rc = read(tipc_handle, &hdr, sizeof(hdr));
if (rc != static_cast<int>(sizeof(hdr))) {
LOG(ERROR) << AT << "failed to receive INIT response";
return;
}
if (hdr.cmd != (CONFIRMATIONUI_CMD_INIT | CONFIRMATIONUI_RESP_BIT)) {
LOG(ERROR) << AT << "unknown response command: " << hdr.cmd;
return;
}
void* shm_base = mmap(0, shm_len, PROT_READ | PROT_WRITE, MAP_SHARED, dma_buf, 0);
if (shm_base == MAP_FAILED) {
LOG(ERROR) << AT << "failed to mmap() shared memory buffer";
return;
}
handle_ = std::move(tipc_handle);
shm_base_ = shm_base;
shm_len_ = shm_len;
LOG(INFO) << AT << "succeeded to connect to Trusty TA \"" << appname << "\"";
}
TrustyApp::~TrustyApp() {
LOG(INFO) << "Done shutting down TrustyApp";
}
} // namespace confirmationui
} // namespace trusty
} // namespace android
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