nexus: Initial checkin of Nexus - android native network management daemon.
Initial skelaton
Signed-off-by: San Mehat <san@google.com>
diff --git a/nexus/Controller.cpp b/nexus/Controller.cpp
new file mode 100644
index 0000000..cc1a187
--- /dev/null
+++ b/nexus/Controller.cpp
@@ -0,0 +1,144 @@
+/*
+ * 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 <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <malloc.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define LOG_TAG "Controller"
+
+#include <cutils/log.h>
+
+#include "Controller.h"
+
+extern "C" int init_module(void *, unsigned int, const char *);
+extern "C" int delete_module(const char *, unsigned int);
+
+Controller::Controller(const char *name) {
+ mName = name;
+}
+
+int Controller::start() {
+ return 0;
+}
+
+int Controller::stop() {
+ return 0;
+}
+
+int Controller::loadKernelModule(char *modpath, const char *args) {
+ void *module;
+ unsigned int size;
+
+ LOGD("loadKernelModule(%s, %s)", modpath, args);
+
+ module = loadFile(modpath, &size);
+ if (!module) {
+ errno = -EIO;
+ return -1;
+ }
+
+ int rc = init_module(module, size, args);
+ free (module);
+ return rc;
+}
+
+int Controller::unloadKernelModule(const char *modtag) {
+ int rc = -1;
+ int retries = 10;
+
+ LOGD("unloadKernelModule(%s)", modtag);
+ while (retries--) {
+ rc = delete_module(modtag, O_NONBLOCK | O_EXCL);
+ if (rc < 0 && errno == EAGAIN)
+ usleep(1000*500);
+ else
+ break;
+ }
+
+ if (rc != 0) {
+ LOGW("Unable to unload kernel driver '%s' (%s)", modtag,
+ strerror(errno));
+ }
+ return rc;
+}
+
+bool Controller::isKernelModuleLoaded(const char *modtag) {
+ FILE *fp = fopen("/proc/modules", "r");
+
+ if (!fp) {
+ LOGE("Unable to open /proc/modules (%s)", strerror(errno));
+ return false;
+ }
+
+ char line[255];
+ while(fgets(line, sizeof(line), fp)) {
+ char *endTag = strchr(line, ' ');
+
+ if (!endTag) {
+ LOGW("Unable to find tag for line '%s'", line);
+ continue;
+ }
+ if (!strncmp(line, modtag, (endTag - line))) {
+ fclose(fp);
+ return true;
+ }
+ }
+
+ fclose(fp);
+ return false;
+}
+
+
+void *Controller::loadFile(char *filename, unsigned int *_size)
+{
+ int ret, fd;
+ struct stat sb;
+ ssize_t size;
+ void *buffer = NULL;
+
+ /* open the file */
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ /* find out how big it is */
+ if (fstat(fd, &sb) < 0)
+ goto bail;
+ size = sb.st_size;
+
+ /* allocate memory for it to be read into */
+ buffer = malloc(size);
+ if (!buffer)
+ goto bail;
+
+ /* slurp it into our buffer */
+ ret = read(fd, buffer, size);
+ if (ret != size)
+ goto bail;
+
+ /* let the caller know how big it is */
+ *_size = size;
+
+bail:
+ close(fd);
+ return buffer;
+}