1 /*
2 * Copyright (C) 2013 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 "NetworkStats"
18
19 #include <errno.h>
20 #include <sys/stat.h>
21 #include <sys/types.h>
22
23 #include <android_runtime/AndroidRuntime.h>
24 #include <jni.h>
25
26 #include <ScopedUtfChars.h>
27 #include <ScopedLocalRef.h>
28 #include <ScopedPrimitiveArray.h>
29
30 #include <utils/Log.h>
31 #include <utils/misc.h>
32 #include <utils/Vector.h>
33
34 namespace android {
35
36 static jclass gStringClass;
37
38 static struct {
39 jfieldID size;
40 jfieldID capacity;
41 jfieldID iface;
42 jfieldID uid;
43 jfieldID set;
44 jfieldID tag;
45 jfieldID rxBytes;
46 jfieldID rxPackets;
47 jfieldID txBytes;
48 jfieldID txPackets;
49 jfieldID operations;
50 } gNetworkStatsClassInfo;
51
52 struct stats_line {
53 char iface[32];
54 int32_t uid;
55 int32_t set;
56 int32_t tag;
57 int64_t rxBytes;
58 int64_t rxPackets;
59 int64_t txBytes;
60 int64_t txPackets;
61 };
62
get_string_array(JNIEnv * env,jobject obj,jfieldID field,int size,bool grow)63 static jobjectArray get_string_array(JNIEnv* env, jobject obj, jfieldID field, int size, bool grow)
64 {
65 if (!grow) {
66 jobjectArray array = (jobjectArray)env->GetObjectField(obj, field);
67 if (array != NULL) {
68 return array;
69 }
70 }
71 return env->NewObjectArray(size, gStringClass, NULL);
72 }
73
get_int_array(JNIEnv * env,jobject obj,jfieldID field,int size,bool grow)74 static jintArray get_int_array(JNIEnv* env, jobject obj, jfieldID field, int size, bool grow)
75 {
76 if (!grow) {
77 jintArray array = (jintArray)env->GetObjectField(obj, field);
78 if (array != NULL) {
79 return array;
80 }
81 }
82 return env->NewIntArray(size);
83 }
84
get_long_array(JNIEnv * env,jobject obj,jfieldID field,int size,bool grow)85 static jlongArray get_long_array(JNIEnv* env, jobject obj, jfieldID field, int size, bool grow)
86 {
87 if (!grow) {
88 jlongArray array = (jlongArray)env->GetObjectField(obj, field);
89 if (array != NULL) {
90 return array;
91 }
92 }
93 return env->NewLongArray(size);
94 }
95
readNetworkStatsDetail(JNIEnv * env,jclass clazz,jobject stats,jstring path,jint limitUid,jobjectArray limitIfacesObj,jint limitTag)96 static int readNetworkStatsDetail(JNIEnv* env, jclass clazz, jobject stats,
97 jstring path, jint limitUid, jobjectArray limitIfacesObj, jint limitTag) {
98 ScopedUtfChars path8(env, path);
99 if (path8.c_str() == NULL) {
100 return -1;
101 }
102
103 FILE *fp = fopen(path8.c_str(), "r");
104 if (fp == NULL) {
105 return -1;
106 }
107
108 Vector<String8> limitIfaces;
109 if (limitIfacesObj != NULL && env->GetArrayLength(limitIfacesObj) > 0) {
110 int num = env->GetArrayLength(limitIfacesObj);
111 limitIfaces.setCapacity(num);
112 for (int i=0; i<num; i++) {
113 jstring string = (jstring)env->GetObjectArrayElement(limitIfacesObj, i);
114 ScopedUtfChars string8(env, string);
115 if (string8.c_str() != NULL) {
116 limitIfaces.add(String8(string8.c_str()));
117 }
118 }
119 }
120
121 Vector<stats_line> lines;
122
123 int lastIdx = 1;
124 int idx;
125 char buffer[384];
126 while (fgets(buffer, sizeof(buffer), fp) != NULL) {
127 stats_line s;
128 int64_t rawTag;
129 char* pos = buffer;
130 char* endPos;
131 // First field is the index.
132 idx = (int)strtol(pos, &endPos, 10);
133 //ALOGI("Index #%d: %s", idx, buffer);
134 if (pos == endPos) {
135 // Skip lines that don't start with in index. In particular,
136 // this will skip the initial header line.
137 continue;
138 }
139 if (idx != lastIdx + 1) {
140 ALOGE("inconsistent idx=%d after lastIdx=%d: %s", idx, lastIdx, buffer);
141 fclose(fp);
142 return -1;
143 }
144 lastIdx = idx;
145 pos = endPos;
146 // Skip whitespace.
147 while (*pos == ' ') {
148 pos++;
149 }
150 // Next field is iface.
151 int ifaceIdx = 0;
152 while (*pos != ' ' && *pos != 0 && ifaceIdx < (int)(sizeof(s.iface)-1)) {
153 s.iface[ifaceIdx] = *pos;
154 ifaceIdx++;
155 pos++;
156 }
157 if (*pos != ' ') {
158 ALOGE("bad iface: %s", buffer);
159 fclose(fp);
160 return -1;
161 }
162 s.iface[ifaceIdx] = 0;
163 if (limitIfaces.size() > 0) {
164 // Is this an iface the caller is interested in?
165 int i = 0;
166 while (i < (int)limitIfaces.size()) {
167 if (limitIfaces[i] == s.iface) {
168 break;
169 }
170 i++;
171 }
172 if (i >= (int)limitIfaces.size()) {
173 // Nothing matched; skip this line.
174 //ALOGI("skipping due to iface: %s", buffer);
175 continue;
176 }
177 }
178
179 // Ignore whitespace
180 while (*pos == ' ') pos++;
181
182 // Find end of tag field
183 endPos = pos;
184 while (*endPos != ' ') endPos++;
185
186 // Three digit field is always 0x0, otherwise parse
187 if (endPos - pos == 3) {
188 rawTag = 0;
189 } else {
190 if (sscanf(pos, "%llx", &rawTag) != 1) {
191 ALOGE("bad tag: %s", pos);
192 fclose(fp);
193 return -1;
194 }
195 }
196 s.tag = rawTag >> 32;
197 if (limitTag != -1 && s.tag != limitTag) {
198 //ALOGI("skipping due to tag: %s", buffer);
199 continue;
200 }
201 pos = endPos;
202
203 // Ignore whitespace
204 while (*pos == ' ') pos++;
205
206 // Parse remaining fields.
207 if (sscanf(pos, "%u %u %llu %llu %llu %llu",
208 &s.uid, &s.set, &s.rxBytes, &s.rxPackets,
209 &s.txBytes, &s.txPackets) == 6) {
210 if (limitUid != -1 && limitUid != s.uid) {
211 //ALOGI("skipping due to uid: %s", buffer);
212 continue;
213 }
214 lines.push_back(s);
215 } else {
216 //ALOGI("skipping due to bad remaining fields: %s", pos);
217 }
218 }
219
220 if (fclose(fp) != 0) {
221 ALOGE("Failed to close netstats file");
222 return -1;
223 }
224
225 int size = lines.size();
226 bool grow = size > env->GetIntField(stats, gNetworkStatsClassInfo.capacity);
227
228 ScopedLocalRef<jobjectArray> iface(env, get_string_array(env, stats,
229 gNetworkStatsClassInfo.iface, size, grow));
230 if (iface.get() == NULL) return -1;
231 ScopedIntArrayRW uid(env, get_int_array(env, stats,
232 gNetworkStatsClassInfo.uid, size, grow));
233 if (uid.get() == NULL) return -1;
234 ScopedIntArrayRW set(env, get_int_array(env, stats,
235 gNetworkStatsClassInfo.set, size, grow));
236 if (set.get() == NULL) return -1;
237 ScopedIntArrayRW tag(env, get_int_array(env, stats,
238 gNetworkStatsClassInfo.tag, size, grow));
239 if (tag.get() == NULL) return -1;
240 ScopedLongArrayRW rxBytes(env, get_long_array(env, stats,
241 gNetworkStatsClassInfo.rxBytes, size, grow));
242 if (rxBytes.get() == NULL) return -1;
243 ScopedLongArrayRW rxPackets(env, get_long_array(env, stats,
244 gNetworkStatsClassInfo.rxPackets, size, grow));
245 if (rxPackets.get() == NULL) return -1;
246 ScopedLongArrayRW txBytes(env, get_long_array(env, stats,
247 gNetworkStatsClassInfo.txBytes, size, grow));
248 if (txBytes.get() == NULL) return -1;
249 ScopedLongArrayRW txPackets(env, get_long_array(env, stats,
250 gNetworkStatsClassInfo.txPackets, size, grow));
251 if (txPackets.get() == NULL) return -1;
252 ScopedLongArrayRW operations(env, get_long_array(env, stats,
253 gNetworkStatsClassInfo.operations, size, grow));
254 if (operations.get() == NULL) return -1;
255
256 for (int i = 0; i < size; i++) {
257 ScopedLocalRef<jstring> ifaceString(env, env->NewStringUTF(lines[i].iface));
258 env->SetObjectArrayElement(iface.get(), i, ifaceString.get());
259
260 uid[i] = lines[i].uid;
261 set[i] = lines[i].set;
262 tag[i] = lines[i].tag;
263 rxBytes[i] = lines[i].rxBytes;
264 rxPackets[i] = lines[i].rxPackets;
265 txBytes[i] = lines[i].txBytes;
266 txPackets[i] = lines[i].txPackets;
267 }
268
269 env->SetIntField(stats, gNetworkStatsClassInfo.size, size);
270 if (grow) {
271 env->SetIntField(stats, gNetworkStatsClassInfo.capacity, size);
272 env->SetObjectField(stats, gNetworkStatsClassInfo.iface, iface.get());
273 env->SetObjectField(stats, gNetworkStatsClassInfo.uid, uid.getJavaArray());
274 env->SetObjectField(stats, gNetworkStatsClassInfo.set, set.getJavaArray());
275 env->SetObjectField(stats, gNetworkStatsClassInfo.tag, tag.getJavaArray());
276 env->SetObjectField(stats, gNetworkStatsClassInfo.rxBytes, rxBytes.getJavaArray());
277 env->SetObjectField(stats, gNetworkStatsClassInfo.rxPackets, rxPackets.getJavaArray());
278 env->SetObjectField(stats, gNetworkStatsClassInfo.txBytes, txBytes.getJavaArray());
279 env->SetObjectField(stats, gNetworkStatsClassInfo.txPackets, txPackets.getJavaArray());
280 env->SetObjectField(stats, gNetworkStatsClassInfo.operations, operations.getJavaArray());
281 }
282
283 return 0;
284 }
285
findClass(JNIEnv * env,const char * name)286 static jclass findClass(JNIEnv* env, const char* name) {
287 ScopedLocalRef<jclass> localClass(env, env->FindClass(name));
288 jclass result = reinterpret_cast<jclass>(env->NewGlobalRef(localClass.get()));
289 if (result == NULL) {
290 ALOGE("failed to find class '%s'", name);
291 abort();
292 }
293 return result;
294 }
295
296 static JNINativeMethod gMethods[] = {
297 { "nativeReadNetworkStatsDetail",
298 "(Landroid/net/NetworkStats;Ljava/lang/String;I[Ljava/lang/String;I)I",
299 (void*) readNetworkStatsDetail }
300 };
301
register_com_android_internal_net_NetworkStatsFactory(JNIEnv * env)302 int register_com_android_internal_net_NetworkStatsFactory(JNIEnv* env) {
303 int err = AndroidRuntime::registerNativeMethods(env,
304 "com/android/internal/net/NetworkStatsFactory", gMethods,
305 NELEM(gMethods));
306
307 gStringClass = findClass(env, "java/lang/String");
308
309 jclass clazz = env->FindClass("android/net/NetworkStats");
310 gNetworkStatsClassInfo.size = env->GetFieldID(clazz, "size", "I");
311 gNetworkStatsClassInfo.capacity = env->GetFieldID(clazz, "capacity", "I");
312 gNetworkStatsClassInfo.iface = env->GetFieldID(clazz, "iface", "[Ljava/lang/String;");
313 gNetworkStatsClassInfo.uid = env->GetFieldID(clazz, "uid", "[I");
314 gNetworkStatsClassInfo.set = env->GetFieldID(clazz, "set", "[I");
315 gNetworkStatsClassInfo.tag = env->GetFieldID(clazz, "tag", "[I");
316 gNetworkStatsClassInfo.rxBytes = env->GetFieldID(clazz, "rxBytes", "[J");
317 gNetworkStatsClassInfo.rxPackets = env->GetFieldID(clazz, "rxPackets", "[J");
318 gNetworkStatsClassInfo.txBytes = env->GetFieldID(clazz, "txBytes", "[J");
319 gNetworkStatsClassInfo.txPackets = env->GetFieldID(clazz, "txPackets", "[J");
320 gNetworkStatsClassInfo.operations = env->GetFieldID(clazz, "operations", "[J");
321
322 return err;
323 }
324
325 }
326