logd: initial checkin.

* Create a new userspace log daemon for handling logging messages.

Original-Change-Id: I75267df16359684490121e6c31cca48614d79856
Signed-off-by: Nick Kralevich <nnk@google.com>

* Merge conflicts
* rename new syslog daemon to logd to prevent confusion with bionic syslog
* replace racy getGroups call with KISS call to client->getGid()
* Timestamps are filed at logging source
* insert entries into list in timestamp order
* Added LogTimeEntry tail filtration handling
* Added region locking around LogWriter list
* separate threads for each writer
* /dev/socket/logd* permissions

Signed-off-by: Mark Salyzyn <salyzyn@google.com>

(cherry picked from commit 3e76e0a49760c4970b7cda6153e51026af98e4f3)

Author: Nick Kralevich <nnk@google.com>
Change-Id: Ice88b1412d8f9daa7f9119b2b5aaf684a5e28098

1 files changed, 137 insertions, 0 deletions

diff --git a/logd/CommandListener.cpp b/logd/CommandListener.cpp
new file mode 100644
index 000000000..f5cb8dc47
--- /dev/null
+++ b/logd/CommandListener.cpp
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2012-2013 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 <arpa/inet.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <sysutils/SocketClient.h>
+#include <private/android_filesystem_config.h>
+
+#include "CommandListener.h"
+
+CommandListener::CommandListener(LogBuffer *buf, LogReader * /*reader*/,
+                                 LogListener * /*swl*/)
+        : FrameworkListener("logd")
+        , mBuf(*buf) {
+    // registerCmd(new ShutdownCmd(buf, writer, swl));
+    registerCmd(new ClearCmd(buf));
+    registerCmd(new GetBufSizeCmd(buf));
+    registerCmd(new GetBufSizeUsedCmd(buf));
+}
+
+CommandListener::ShutdownCmd::ShutdownCmd(LogBuffer *buf, LogReader *reader,
+                                          LogListener *swl)
+        : LogCommand("shutdown")
+        , mBuf(*buf)
+        , mReader(*reader)
+        , mSwl(*swl)
+{ }
+
+int CommandListener::ShutdownCmd::runCommand(SocketClient * /*cli*/,
+                                             int /*argc*/,
+                                             char ** /*argv*/) {
+    mSwl.stopListener();
+    mReader.stopListener();
+    exit(0);
+}
+
+CommandListener::ClearCmd::ClearCmd(LogBuffer *buf)
+        : LogCommand("clear")
+        , mBuf(*buf)
+{ }
+
+int CommandListener::ClearCmd::runCommand(SocketClient *cli,
+                                         int argc, char **argv) {
+    if ((cli->getUid() != AID_ROOT)
+            && (cli->getGid() != AID_ROOT)
+            && (cli->getGid() != AID_LOG)) {
+        cli->sendMsg("Permission Denied");
+        return 0;
+    }
+
+    if (argc < 2) {
+        cli->sendMsg("Missing Argument");
+        return 0;
+    }
+
+    int id = atoi(argv[1]);
+    if ((id < LOG_ID_MIN) || (id >= LOG_ID_MAX)) {
+        cli->sendMsg("Range Error");
+        return 0;
+    }
+
+    mBuf.clear((log_id_t) id);
+    cli->sendMsg("success");
+    return 0;
+}
+
+
+CommandListener::GetBufSizeCmd::GetBufSizeCmd(LogBuffer *buf)
+        : LogCommand("getLogSize")
+        , mBuf(*buf)
+{ }
+
+int CommandListener::GetBufSizeCmd::runCommand(SocketClient *cli,
+                                         int argc, char **argv) {
+    if (argc < 2) {
+        cli->sendMsg("Missing Argument");
+        return 0;
+    }
+
+    int id = atoi(argv[1]);
+    if ((id < LOG_ID_MIN) || (id >= LOG_ID_MAX)) {
+        cli->sendMsg("Range Error");
+        return 0;
+    }
+
+    unsigned long size = mBuf.getSize((log_id_t) id);
+    char buf[512];
+    snprintf(buf, sizeof(buf), "%lu", size);
+    cli->sendMsg(buf);
+    return 0;
+}
+
+CommandListener::GetBufSizeUsedCmd::GetBufSizeUsedCmd(LogBuffer *buf)
+        : LogCommand("getLogSizeUsed")
+        , mBuf(*buf)
+{ }
+
+int CommandListener::GetBufSizeUsedCmd::runCommand(SocketClient *cli,
+                                         int argc, char **argv) {
+    if (argc < 2) {
+        cli->sendMsg("Missing Argument");
+        return 0;
+    }
+
+    int id = atoi(argv[1]);
+    if ((id < LOG_ID_MIN) || (id >= LOG_ID_MAX)) {
+        cli->sendMsg("Range Error");
+        return 0;
+    }
+
+    unsigned long size = mBuf.getSizeUsed((log_id_t) id);
+    char buf[512];
+    snprintf(buf, sizeof(buf), "%lu", size);
+    cli->sendMsg(buf);
+    return 0;
+}