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
|
/*
* Copyright (C) 2008 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 <errno.h>
#include <string.h>
#include <stdlib.h>
#define LOG_TAG "FrameworkListener"
#include <cutils/log.h>
#include <sysutils/FrameworkListener.h>
#include <sysutils/FrameworkCommand.h>
#include <sysutils/SocketClient.h>
static const int CMD_BUF_SIZE = 1024;
#define UNUSED __attribute__((unused))
FrameworkListener::FrameworkListener(const char *socketName, bool withSeq) :
SocketListener(socketName, true, withSeq) {
init(socketName, withSeq);
}
FrameworkListener::FrameworkListener(const char *socketName) :
SocketListener(socketName, true, false) {
init(socketName, false);
}
FrameworkListener::FrameworkListener(int sock) :
SocketListener(sock, true) {
init(NULL, false);
}
void FrameworkListener::init(const char *socketName UNUSED, bool withSeq) {
mCommands = new FrameworkCommandCollection();
errorRate = 0;
mCommandCount = 0;
mWithSeq = withSeq;
mSkipToNextNullByte = false;
}
bool FrameworkListener::onDataAvailable(SocketClient *c) {
char buffer[CMD_BUF_SIZE];
int len;
len = TEMP_FAILURE_RETRY(read(c->getSocket(), buffer, sizeof(buffer)));
if (len < 0) {
SLOGE("read() failed (%s)", strerror(errno));
return false;
} else if (!len) {
return false;
} else if (buffer[len-1] != '\0') {
SLOGW("String is not zero-terminated");
android_errorWriteLog(0x534e4554, "29831647");
c->sendMsg(500, "Command too large for buffer", false);
mSkipToNextNullByte = true;
return false;
}
int offset = 0;
int i;
for (i = 0; i < len; i++) {
if (buffer[i] == '\0') {
/* IMPORTANT: dispatchCommand() expects a zero-terminated string */
if (mSkipToNextNullByte) {
mSkipToNextNullByte = false;
} else {
dispatchCommand(c, buffer + offset);
}
offset = i + 1;
}
}
mSkipToNextNullByte = false;
return true;
}
void FrameworkListener::registerCmd(FrameworkCommand *cmd) {
mCommands->push_back(cmd);
}
void FrameworkListener::dispatchCommand(SocketClient *cli, char *data) {
FrameworkCommandCollection::iterator i;
int argc = 0;
char *argv[FrameworkListener::CMD_ARGS_MAX];
char tmp[CMD_BUF_SIZE];
char *p = data;
char *q = tmp;
char *qlimit = tmp + sizeof(tmp) - 1;
bool esc = false;
bool quote = false;
bool haveCmdNum = !mWithSeq;
memset(argv, 0, sizeof(argv));
memset(tmp, 0, sizeof(tmp));
while(*p) {
if (*p == '\\') {
if (esc) {
if (q >= qlimit)
goto overflow;
*q++ = '\\';
esc = false;
} else
esc = true;
p++;
continue;
} else if (esc) {
if (*p == '"') {
if (q >= qlimit)
goto overflow;
*q++ = '"';
} else if (*p == '\\') {
if (q >= qlimit)
goto overflow;
*q++ = '\\';
} else {
cli->sendMsg(500, "Unsupported escape sequence", false);
goto out;
}
p++;
esc = false;
continue;
}
if (*p == '"') {
if (quote)
quote = false;
else
quote = true;
p++;
continue;
}
if (q >= qlimit)
goto overflow;
*q = *p++;
if (!quote && *q == ' ') {
*q = '\0';
if (!haveCmdNum) {
char *endptr;
int cmdNum = (int)strtol(tmp, &endptr, 0);
if (endptr == NULL || *endptr != '\0') {
cli->sendMsg(500, "Invalid sequence number", false);
goto out;
}
cli->setCmdNum(cmdNum);
haveCmdNum = true;
} else {
if (argc >= CMD_ARGS_MAX)
goto overflow;
argv[argc++] = strdup(tmp);
}
memset(tmp, 0, sizeof(tmp));
q = tmp;
continue;
}
q++;
}
*q = '\0';
if (argc >= CMD_ARGS_MAX)
goto overflow;
argv[argc++] = strdup(tmp);
#if 0
for (int k = 0; k < argc; k++) {
SLOGD("arg[%d] = '%s'", k, argv[k]);
}
#endif
if (quote) {
cli->sendMsg(500, "Unclosed quotes error", false);
goto out;
}
if (errorRate && (++mCommandCount % errorRate == 0)) {
/* ignore this command - let the timeout handler handle it */
SLOGE("Faking a timeout");
goto out;
}
for (i = mCommands->begin(); i != mCommands->end(); ++i) {
FrameworkCommand *c = *i;
if (!strcmp(argv[0], c->getCommand())) {
if (c->runCommand(cli, argc, argv)) {
SLOGW("Handler '%s' error (%s)", c->getCommand(), strerror(errno));
}
goto out;
}
}
cli->sendMsg(500, "Command not recognized", false);
out:
int j;
for (j = 0; j < argc; j++)
free(argv[j]);
return;
overflow:
LOG_EVENT_INT(78001, cli->getUid());
cli->sendMsg(500, "Command too long", false);
goto out;
}
|
