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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
#include <alloca.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#define LOG_TAG "SocketClient"
#include <cutils/log.h>
#include <sysutils/SocketClient.h>
SocketClient::SocketClient(int socket, bool owned) {
init(socket, owned, false);
}
SocketClient::SocketClient(int socket, bool owned, bool useCmdNum) {
init(socket, owned, useCmdNum);
}
void SocketClient::init(int socket, bool owned, bool useCmdNum) {
mSocket = socket;
mSocketOwned = owned;
mUseCmdNum = useCmdNum;
pthread_mutex_init(&mWriteMutex, NULL);
pthread_mutex_init(&mRefCountMutex, NULL);
mPid = -1;
mUid = -1;
mGid = -1;
mRefCount = 1;
mCmdNum = 0;
struct ucred creds;
socklen_t szCreds = sizeof(creds);
memset(&creds, 0, szCreds);
int err = getsockopt(socket, SOL_SOCKET, SO_PEERCRED, &creds, &szCreds);
if (err == 0) {
mPid = creds.pid;
mUid = creds.uid;
mGid = creds.gid;
}
}
SocketClient::~SocketClient() {
if (mSocketOwned) {
close(mSocket);
}
}
int SocketClient::sendMsg(int code, const char *msg, bool addErrno) {
return sendMsg(code, msg, addErrno, mUseCmdNum);
}
int SocketClient::sendMsg(int code, const char *msg, bool addErrno, bool useCmdNum) {
char *buf;
int ret = 0;
if (addErrno) {
if (useCmdNum) {
ret = asprintf(&buf, "%d %d %s (%s)", code, getCmdNum(), msg, strerror(errno));
} else {
ret = asprintf(&buf, "%d %s (%s)", code, msg, strerror(errno));
}
} else {
if (useCmdNum) {
ret = asprintf(&buf, "%d %d %s", code, getCmdNum(), msg);
} else {
ret = asprintf(&buf, "%d %s", code, msg);
}
}
// Send the zero-terminated message
if (ret != -1) {
ret = sendMsg(buf);
free(buf);
}
return ret;
}
// send 3-digit code, null, binary-length, binary data
int SocketClient::sendBinaryMsg(int code, const void *data, int len) {
// 4 bytes for the code & null + 4 bytes for the len
char buf[8];
// Write the code
snprintf(buf, 4, "%.3d", code);
// Write the len
uint32_t tmp = htonl(len);
memcpy(buf + 4, &tmp, sizeof(uint32_t));
struct iovec vec[2];
vec[0].iov_base = (void *) buf;
vec[0].iov_len = sizeof(buf);
vec[1].iov_base = (void *) data;
vec[1].iov_len = len;
pthread_mutex_lock(&mWriteMutex);
int result = sendDataLockedv(vec, (len > 0) ? 2 : 1);
pthread_mutex_unlock(&mWriteMutex);
return result;
}
// Sends the code (c-string null-terminated).
int SocketClient::sendCode(int code) {
char buf[4];
snprintf(buf, sizeof(buf), "%.3d", code);
return sendData(buf, sizeof(buf));
}
char *SocketClient::quoteArg(const char *arg) {
int len = strlen(arg);
char *result = (char *)malloc(len * 2 + 3);
char *current = result;
const char *end = arg + len;
char *oldresult;
if(result == NULL) {
SLOGW("malloc error (%s)", strerror(errno));
return NULL;
}
*(current++) = '"';
while (arg < end) {
switch (*arg) {
case '\\':
case '"':
*(current++) = '\\'; // fallthrough
default:
*(current++) = *(arg++);
}
}
*(current++) = '"';
*(current++) = '\0';
oldresult = result; // save pointer in case realloc fails
result = (char *)realloc(result, current-result);
return result ? result : oldresult;
}
int SocketClient::sendMsg(const char *msg) {
// Send the message including null character
if (sendData(msg, strlen(msg) + 1) != 0) {
SLOGW("Unable to send msg '%s'", msg);
return -1;
}
return 0;
}
int SocketClient::sendData(const void *data, int len) {
struct iovec vec[1];
vec[0].iov_base = (void *) data;
vec[0].iov_len = len;
pthread_mutex_lock(&mWriteMutex);
int rc = sendDataLockedv(vec, 1);
pthread_mutex_unlock(&mWriteMutex);
return rc;
}
int SocketClient::sendDatav(struct iovec *iov, int iovcnt) {
pthread_mutex_lock(&mWriteMutex);
int rc = sendDataLockedv(iov, iovcnt);
pthread_mutex_unlock(&mWriteMutex);
return rc;
}
int SocketClient::sendDataLockedv(struct iovec *iov, int iovcnt) {
if (mSocket < 0) {
errno = EHOSTUNREACH;
return -1;
}
if (iovcnt <= 0) {
return 0;
}
int ret = 0;
int e = 0; // SLOGW and sigaction are not inert regarding errno
int current = 0;
struct sigaction new_action, old_action;
memset(&new_action, 0, sizeof(new_action));
new_action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &new_action, &old_action);
for (;;) {
ssize_t rc = TEMP_FAILURE_RETRY(
writev(mSocket, iov + current, iovcnt - current));
if (rc > 0) {
size_t written = rc;
while ((current < iovcnt) && (written >= iov[current].iov_len)) {
written -= iov[current].iov_len;
current++;
}
if (current == iovcnt) {
break;
}
iov[current].iov_base = (char *)iov[current].iov_base + written;
iov[current].iov_len -= written;
continue;
}
if (rc == 0) {
e = EIO;
SLOGW("0 length write :(");
} else {
e = errno;
SLOGW("write error (%s)", strerror(e));
}
ret = -1;
break;
}
sigaction(SIGPIPE, &old_action, &new_action);
errno = e;
return ret;
}
void SocketClient::incRef() {
pthread_mutex_lock(&mRefCountMutex);
mRefCount++;
pthread_mutex_unlock(&mRefCountMutex);
}
bool SocketClient::decRef() {
bool deleteSelf = false;
pthread_mutex_lock(&mRefCountMutex);
mRefCount--;
if (mRefCount == 0) {
deleteSelf = true;
} else if (mRefCount < 0) {
SLOGE("SocketClient refcount went negative!");
}
pthread_mutex_unlock(&mRefCountMutex);
if (deleteSelf) {
delete this;
}
return deleteSelf;
}
|
