1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "RpcRawTransport"
18 #include <log/log.h>
19
20 #include <poll.h>
21 #include <stddef.h>
22
23 #include <binder/RpcTransportRaw.h>
24
25 #include "FdTrigger.h"
26 #include "OS.h"
27 #include "RpcState.h"
28 #include "RpcTransportUtils.h"
29
30 namespace android {
31
32 namespace {
33
34 // RpcTransport with TLS disabled.
35 class RpcTransportRaw : public RpcTransport {
36 public:
RpcTransportRaw(android::RpcTransportFd socket)37 explicit RpcTransportRaw(android::RpcTransportFd socket) : mSocket(std::move(socket)) {}
pollRead(void)38 status_t pollRead(void) override {
39 uint8_t buf;
40 ssize_t ret = TEMP_FAILURE_RETRY(
41 ::recv(mSocket.fd.get(), &buf, sizeof(buf), MSG_PEEK | MSG_DONTWAIT));
42 if (ret < 0) {
43 int savedErrno = errno;
44 if (savedErrno == EAGAIN || savedErrno == EWOULDBLOCK) {
45 return WOULD_BLOCK;
46 }
47
48 LOG_RPC_DETAIL("RpcTransport poll(): %s", strerror(savedErrno));
49 return -savedErrno;
50 } else if (ret == 0) {
51 return DEAD_OBJECT;
52 }
53
54 return OK;
55 }
56
interruptableWriteFully(FdTrigger * fdTrigger,iovec * iovs,int niovs,const std::optional<android::base::function_ref<status_t ()>> & altPoll,const std::vector<std::variant<base::unique_fd,base::borrowed_fd>> * ancillaryFds)57 status_t interruptableWriteFully(
58 FdTrigger* fdTrigger, iovec* iovs, int niovs,
59 const std::optional<android::base::function_ref<status_t()>>& altPoll,
60 const std::vector<std::variant<base::unique_fd, base::borrowed_fd>>* ancillaryFds)
61 override {
62 bool sentFds = false;
63 auto send = [&](iovec* iovs, int niovs) -> ssize_t {
64 ssize_t ret =
65 sendMessageOnSocket(mSocket, iovs, niovs, sentFds ? nullptr : ancillaryFds);
66 sentFds |= ret > 0;
67 return ret;
68 };
69 return interruptableReadOrWrite(mSocket, fdTrigger, iovs, niovs, send, "sendmsg", POLLOUT,
70 altPoll);
71 }
72
interruptableReadFully(FdTrigger * fdTrigger,iovec * iovs,int niovs,const std::optional<android::base::function_ref<status_t ()>> & altPoll,std::vector<std::variant<base::unique_fd,base::borrowed_fd>> * ancillaryFds)73 status_t interruptableReadFully(
74 FdTrigger* fdTrigger, iovec* iovs, int niovs,
75 const std::optional<android::base::function_ref<status_t()>>& altPoll,
76 std::vector<std::variant<base::unique_fd, base::borrowed_fd>>* ancillaryFds) override {
77 auto recv = [&](iovec* iovs, int niovs) -> ssize_t {
78 return receiveMessageFromSocket(mSocket, iovs, niovs, ancillaryFds);
79 };
80 return interruptableReadOrWrite(mSocket, fdTrigger, iovs, niovs, recv, "recvmsg", POLLIN,
81 altPoll);
82 }
83
isWaiting()84 virtual bool isWaiting() { return mSocket.isInPollingState(); }
85
86 private:
87 android::RpcTransportFd mSocket;
88 };
89
90 // RpcTransportCtx with TLS disabled.
91 class RpcTransportCtxRaw : public RpcTransportCtx {
92 public:
newTransport(android::RpcTransportFd socket,FdTrigger *) const93 std::unique_ptr<RpcTransport> newTransport(android::RpcTransportFd socket, FdTrigger*) const {
94 return std::make_unique<RpcTransportRaw>(std::move(socket));
95 }
getCertificate(RpcCertificateFormat) const96 std::vector<uint8_t> getCertificate(RpcCertificateFormat) const override { return {}; }
97 };
98
99 } // namespace
100
newServerCtx() const101 std::unique_ptr<RpcTransportCtx> RpcTransportCtxFactoryRaw::newServerCtx() const {
102 return std::make_unique<RpcTransportCtxRaw>();
103 }
104
newClientCtx() const105 std::unique_ptr<RpcTransportCtx> RpcTransportCtxFactoryRaw::newClientCtx() const {
106 return std::make_unique<RpcTransportCtxRaw>();
107 }
108
toCString() const109 const char *RpcTransportCtxFactoryRaw::toCString() const {
110 return "raw";
111 }
112
make()113 std::unique_ptr<RpcTransportCtxFactory> RpcTransportCtxFactoryRaw::make() {
114 return std::unique_ptr<RpcTransportCtxFactoryRaw>(new RpcTransportCtxFactoryRaw());
115 }
116
117 } // namespace android
118