1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/* Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation, nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <log_util.h>
#include "LocIpc.h"
using std::string;
namespace loc_util {
#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "LocSvc_LocIpc"
#define LOC_MSG_BUF_LEN 8192
#define LOC_MSG_HEAD "$MSGLEN$"
#define LOC_MSG_ABORT "LocIpcMsg::ABORT"
class LocIpcRunnable : public LocRunnable {
friend LocIpc;
public:
LocIpcRunnable(LocIpc& locIpc, const string& ipcName)
: mLocIpc(locIpc), mIpcName(ipcName) {}
bool run() override {
if (!mLocIpc.startListeningBlocking(mIpcName)) {
LOC_LOGe("listen to socket failed");
}
return false;
}
private:
LocIpc& mLocIpc;
const string mIpcName;
};
bool LocIpc::startListeningNonBlocking(const string& name) {
auto runnable = new LocIpcRunnable(*this, name);
string threadName("LocIpc-");
threadName.append(name);
return mThread.start(threadName.c_str(), runnable);
}
bool LocIpc::startListeningBlocking(const string& name) {
bool stopRequested = false;
int fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (fd < 0) {
LOC_LOGe("create socket error. reason:%s", strerror(errno));
return false;
}
if ((unlink(name.c_str()) < 0) && (errno != ENOENT)) {
LOC_LOGw("unlink socket error. reason:%s", strerror(errno));
}
struct sockaddr_un addr = { .sun_family = AF_UNIX };
snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", name.c_str());
umask(0157);
if (::bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
LOC_LOGe("bind socket error. reason:%s", strerror(errno));
} else {
mIpcFd = fd;
mIpcName = name;
// inform that the socket is ready to receive message
onListenerReady();
ssize_t nBytes = 0;
string msg = "";
string abort = LOC_MSG_ABORT;
while (1) {
msg.resize(LOC_MSG_BUF_LEN);
nBytes = ::recvfrom(fd, (void*)(msg.data()), msg.size(), 0, NULL, NULL);
if (nBytes < 0) {
LOC_LOGe("cannot read socket. reason:%s", strerror(errno));
break;
} else if (0 == nBytes) {
continue;
}
if (strncmp(msg.data(), abort.c_str(), abort.length()) == 0) {
LOC_LOGi("recvd abort msg.data %s", msg.data());
stopRequested = true;
break;
}
if (strncmp(msg.data(), LOC_MSG_HEAD, sizeof(LOC_MSG_HEAD) - 1)) {
// short message
msg.resize(nBytes);
onReceive(msg);
} else {
// long message
size_t msgLen = 0;
sscanf(msg.data(), LOC_MSG_HEAD"%zu", &msgLen);
msg.resize(msgLen);
size_t msgLenReceived = 0;
while ((msgLenReceived < msgLen) && (nBytes > 0)) {
nBytes = recvfrom(fd, (void*)&(msg[msgLenReceived]),
msg.size() - msgLenReceived, 0, NULL, NULL);
msgLenReceived += nBytes;
}
if (nBytes > 0) {
onReceive(msg);
} else {
LOC_LOGe("cannot read socket. reason:%s", strerror(errno));
break;
}
}
}
}
if (::close(fd)) {
LOC_LOGe("cannot close socket:%s", strerror(errno));
}
unlink(name.c_str());
return stopRequested;
}
void LocIpc::stopListening() {
if (mIpcFd >= 0) {
string abort = LOC_MSG_ABORT;
if (!mIpcName.empty()) {
send(mIpcName.c_str(), abort);
}
mIpcFd = -1;
}
if (!mIpcName.empty()) {
mIpcName.clear();
}
}
bool LocIpc::send(const char name[], const string& data) {
return send(name, (const uint8_t*)data.c_str(), data.length());
}
bool LocIpc::send(const char name[], const uint8_t data[], uint32_t length) {
bool result = true;
int fd = ::socket(AF_UNIX, SOCK_DGRAM, 0);
if (fd < 0) {
LOC_LOGe("create socket error. reason:%s", strerror(errno));
return false;
}
struct sockaddr_un addr = { .sun_family = AF_UNIX };
snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", name);
result = sendData(fd, addr, data, length);
(void)::close(fd);
return result;
}
bool LocIpc::sendData(int fd, const sockaddr_un &addr, const uint8_t data[], uint32_t length) {
bool result = true;
if (length <= LOC_MSG_BUF_LEN) {
if (::sendto(fd, data, length, 0,
(struct sockaddr*)&addr, sizeof(addr)) < 0) {
LOC_LOGe("cannot send to socket:%s. reason:%s",
addr.sun_path, strerror(errno));
result = false;
}
} else {
string head = LOC_MSG_HEAD;
head.append(std::to_string(length));
if (::sendto(fd, head.c_str(), head.length(), 0,
(struct sockaddr*)&addr, sizeof(addr)) < 0) {
LOC_LOGe("cannot send to socket:%s. reason:%s",
addr.sun_path, strerror(errno));
result = false;
} else {
size_t sentBytes = 0;
while(sentBytes < length) {
size_t partLen = length - sentBytes;
if (partLen > LOC_MSG_BUF_LEN) {
partLen = LOC_MSG_BUF_LEN;
}
ssize_t rv = ::sendto(fd, data + sentBytes, partLen, 0,
(struct sockaddr*)&addr, sizeof(addr));
if (rv < 0) {
LOC_LOGe("cannot send to socket:%s. reason:%s",
addr.sun_path, strerror(errno));
result = false;
break;
}
sentBytes += rv;
}
}
}
return result;
}
}
|
