wifi: duplicate wifi.c into wifi_fst.c

Fast Session Transfer (FST) functionality will be added in wifi_fst in
next commit

Change-Id: Id6560ca437da3c9e794b450e10d979270303312b

2 files changed, 996 insertions, 0 deletions

diff --git a/include/hardware_legacy/wifi_fst.h b/include/hardware_legacy/wifi_fst.h
new file mode 100644
index 0000000..a60718d
--- /dev/null
+++ b/include/hardware_legacy/wifi_fst.h
@@ -0,0 +1,162 @@
+/*
+ * 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.
+ */
+
+#ifndef _WIFI_H
+#define _WIFI_H
+
+#if __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Load the Wi-Fi driver.
+ *
+ * @return 0 on success, < 0 on failure.
+ */
+int wifi_load_driver();
+
+/**
+ * Unload the Wi-Fi driver.
+ *
+ * @return 0 on success, < 0 on failure.
+ */
+int wifi_unload_driver();
+
+/**
+ * Check if the Wi-Fi driver is loaded.
+ * Check if the Wi-Fi driver is loaded.
+
+ * @return 0 on success, < 0 on failure.
+ */
+int is_wifi_driver_loaded();
+
+
+/**
+ * Start supplicant.
+ *
+ * @return 0 on success, < 0 on failure.
+ */
+int wifi_start_supplicant(int p2pSupported);
+
+/**
+ * Stop supplicant.
+ *
+ * @return 0 on success, < 0 on failure.
+ */
+int wifi_stop_supplicant(int p2pSupported);
+
+/**
+ * Open a connection to supplicant
+ *
+ * @return 0 on success, < 0 on failure.
+ */
+int wifi_connect_to_supplicant();
+
+/**
+ * Close connection to supplicant
+ *
+ * @return 0 on success, < 0 on failure.
+ */
+void wifi_close_supplicant_connection();
+
+/**
+ * wifi_wait_for_event() performs a blocking call to 
+ * get a Wi-Fi event and returns a string representing 
+ * a Wi-Fi event when it occurs.
+ *
+ * @param buf is the buffer that receives the event
+ * @param len is the maximum length of the buffer
+ *
+ * @returns number of bytes in buffer, 0 if no
+ * event (for instance, no connection), and less than 0
+ * if there is an error.
+ */
+int wifi_wait_for_event(char *buf, size_t len);
+
+/**
+ * wifi_command() issues a command to the Wi-Fi driver.
+ *
+ * Android extends the standard commands listed at
+ * /link http://hostap.epitest.fi/wpa_supplicant/devel/ctrl_iface_page.html
+ * to include support for sending commands to the driver:
+ *
+ * See wifi/java/android/net/wifi/WifiNative.java for the details of
+ * driver commands that are supported
+ *
+ * @param command is the string command (preallocated with 32 bytes)
+ * @param commandlen is command buffer length
+ * @param reply is a buffer to receive a reply string
+ * @param reply_len on entry, this is the maximum length of
+ *        the reply buffer. On exit, the number of
+ *        bytes in the reply buffer.
+ *
+ * @return 0 if successful, < 0 if an error.
+ */
+int wifi_command(const char *command, char *reply, size_t *reply_len);
+
+/**
+ * do_dhcp_request() issues a dhcp request and returns the acquired
+ * information. 
+ * 
+ * All IPV4 addresses/mask are in network byte order.
+ *
+ * @param ipaddr return the assigned IPV4 address
+ * @param gateway return the gateway being used
+ * @param mask return the IPV4 mask
+ * @param dns1 return the IPV4 address of a DNS server
+ * @param dns2 return the IPV4 address of a DNS server
+ * @param server return the IPV4 address of DHCP server
+ * @param lease return the length of lease in seconds.
+ *
+ * @return 0 if successful, < 0 if error.
+ */
+int do_dhcp_request(int *ipaddr, int *gateway, int *mask,
+                   int *dns1, int *dns2, int *server, int *lease);
+
+/**
+ * Return the error string of the last do_dhcp_request().
+ */
+const char *get_dhcp_error_string();
+
+/**
+ * Return the path to requested firmware
+ */
+#define WIFI_GET_FW_PATH_STA	0
+#define WIFI_GET_FW_PATH_AP	1
+#define WIFI_GET_FW_PATH_P2P	2
+const char *wifi_get_fw_path(int fw_type);
+
+/**
+ * Change the path to firmware for the wlan driver
+ */
+int wifi_change_fw_path(const char *fwpath);
+
+/**
+ * Check and create if necessary initial entropy file
+ */
+#define WIFI_ENTROPY_FILE	"/data/misc/wifi/entropy.bin"
+int ensure_entropy_file_exists();
+
+/**
+* Check and create if necessary the desired configuration file
+*/
+int ensure_config_file_exists(const char *config_file, const char *config_file_template);
+
+#if __cplusplus
+};  // extern "C"
+#endif
+
+#endif  // _WIFI_H
diff --git a/wifi/wifi_fst.c b/wifi/wifi_fst.c
new file mode 100644
index 0000000..89e9397
--- /dev/null
+++ b/wifi/wifi_fst.c
@@ -0,0 +1,834 @@
+/*
+ * Copyright 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 <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <dirent.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <poll.h>
+
+#include "hardware_legacy/wifi.h"
+#ifdef LIBWPA_CLIENT_EXISTS
+#include "libwpa_client/wpa_ctrl.h"
+#endif
+
+#define LOG_TAG "WifiHW"
+#include "cutils/log.h"
+#include "cutils/memory.h"
+#include "cutils/misc.h"
+#include "cutils/properties.h"
+#include "private/android_filesystem_config.h"
+
+#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
+#include <sys/_system_properties.h>
+
+extern int do_dhcp();
+extern int ifc_init();
+extern void ifc_close();
+extern char *dhcp_lasterror();
+extern void get_dhcp_info();
+extern int init_module(void *, unsigned long, const char *);
+extern int delete_module(const char *, unsigned int);
+void wifi_close_sockets();
+
+#ifndef LIBWPA_CLIENT_EXISTS
+#define WPA_EVENT_TERMINATING "CTRL-EVENT-TERMINATING "
+struct wpa_ctrl {};
+void wpa_ctrl_cleanup(void) {}
+struct wpa_ctrl *wpa_ctrl_open(const char *ctrl_path) { return NULL; }
+void wpa_ctrl_close(struct wpa_ctrl *ctrl) {}
+int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
+	char *reply, size_t *reply_len, void (*msg_cb)(char *msg, size_t len))
+	{ return 0; }
+int wpa_ctrl_attach(struct wpa_ctrl *ctrl) { return 0; }
+int wpa_ctrl_detach(struct wpa_ctrl *ctrl) { return 0; }
+int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
+	{ return 0; }
+int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl) { return 0; }
+#endif
+
+static struct wpa_ctrl *ctrl_conn;
+static struct wpa_ctrl *monitor_conn;
+
+/* socket pair used to exit from a blocking read */
+static int exit_sockets[2];
+
+static char primary_iface[PROPERTY_VALUE_MAX];
+// TODO: use new ANDROID_SOCKET mechanism, once support for multiple
+// sockets is in
+
+#ifndef WIFI_DRIVER_MODULE_ARG
+#define WIFI_DRIVER_MODULE_ARG          ""
+#endif
+#ifndef WIFI_FIRMWARE_LOADER
+#define WIFI_FIRMWARE_LOADER		""
+#endif
+#define WIFI_TEST_INTERFACE		"sta"
+
+#ifndef WIFI_DRIVER_FW_PATH_STA
+#define WIFI_DRIVER_FW_PATH_STA		NULL
+#endif
+#ifndef WIFI_DRIVER_FW_PATH_AP
+#define WIFI_DRIVER_FW_PATH_AP		NULL
+#endif
+#ifndef WIFI_DRIVER_FW_PATH_P2P
+#define WIFI_DRIVER_FW_PATH_P2P		NULL
+#endif
+
+#ifndef WIFI_DRIVER_FW_PATH_PARAM
+#define WIFI_DRIVER_FW_PATH_PARAM	"/sys/module/wlan/parameters/fwpath"
+#endif
+
+#define WIFI_DRIVER_LOADER_DELAY	1000000
+
+static const char IFACE_DIR[]           = "/data/system/wpa_supplicant";
+#ifdef WIFI_DRIVER_MODULE_PATH
+static const char DRIVER_MODULE_NAME[]  = WIFI_DRIVER_MODULE_NAME;
+static const char DRIVER_MODULE_TAG[]   = WIFI_DRIVER_MODULE_NAME " ";
+static const char DRIVER_MODULE_PATH[]  = WIFI_DRIVER_MODULE_PATH;
+static const char DRIVER_MODULE_ARG[]   = WIFI_DRIVER_MODULE_ARG;
+#endif
+static const char FIRMWARE_LOADER[]     = WIFI_FIRMWARE_LOADER;
+static const char DRIVER_PROP_NAME[]    = "wlan.driver.status";
+static const char SUPPLICANT_NAME[]     = "wpa_supplicant";
+static const char SUPP_PROP_NAME[]      = "init.svc.wpa_supplicant";
+static const char P2P_SUPPLICANT_NAME[] = "p2p_supplicant";
+static const char P2P_PROP_NAME[]       = "init.svc.p2p_supplicant";
+static const char SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf";
+static const char SUPP_CONFIG_FILE[]    = "/data/misc/wifi/wpa_supplicant.conf";
+static const char P2P_CONFIG_FILE[]     = "/data/misc/wifi/p2p_supplicant.conf";
+static const char CONTROL_IFACE_PATH[]  = "/data/misc/wifi/sockets";
+static const char MODULE_FILE[]         = "/proc/modules";
+
+static const char IFNAME[]              = "IFNAME=";
+#define IFNAMELEN			(sizeof(IFNAME) - 1)
+static const char WPA_EVENT_IGNORE[]    = "CTRL-EVENT-IGNORE ";
+
+static const char SUPP_ENTROPY_FILE[]   = WIFI_ENTROPY_FILE;
+static unsigned char dummy_key[21] = { 0x02, 0x11, 0xbe, 0x33, 0x43, 0x35,
+                                       0x68, 0x47, 0x84, 0x99, 0xa9, 0x2b,
+                                       0x1c, 0xd3, 0xee, 0xff, 0xf1, 0xe2,
+                                       0xf3, 0xf4, 0xf5 };
+
+/* Is either SUPPLICANT_NAME or P2P_SUPPLICANT_NAME */
+static char supplicant_name[PROPERTY_VALUE_MAX];
+/* Is either SUPP_PROP_NAME or P2P_PROP_NAME */
+static char supplicant_prop_name[PROPERTY_KEY_MAX];
+
+static int insmod(const char *filename, const char *args)
+{
+    void *module;
+    unsigned int size;
+    int ret;
+
+    module = load_file(filename, &size);
+    if (!module)
+        return -1;
+
+    ret = init_module(module, size, args);
+
+    free(module);
+
+    return ret;
+}
+
+static int rmmod(const char *modname)
+{
+    int ret = -1;
+    int maxtry = 10;
+
+    while (maxtry-- > 0) {
+        ret = delete_module(modname, O_NONBLOCK | O_EXCL);
+        if (ret < 0 && errno == EAGAIN)
+            usleep(500000);
+        else
+            break;
+    }
+
+    if (ret != 0)
+        ALOGD("Unable to unload driver module \"%s\": %s\n",
+             modname, strerror(errno));
+    return ret;
+}
+
+int do_dhcp_request(int *ipaddr, int *gateway, int *mask,
+                    int *dns1, int *dns2, int *server, int *lease) {
+    /* For test driver, always report success */
+    if (strcmp(primary_iface, WIFI_TEST_INTERFACE) == 0)
+        return 0;
+
+    if (ifc_init() < 0)
+        return -1;
+
+    if (do_dhcp(primary_iface) < 0) {
+        ifc_close();
+        return -1;
+    }
+    ifc_close();
+    get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease);
+    return 0;
+}
+
+const char *get_dhcp_error_string() {
+    return dhcp_lasterror();
+}
+
+#ifdef WIFI_DRIVER_STATE_CTRL_PARAM
+int wifi_change_driver_state(const char *state)
+{
+    int len;
+    int fd;
+    int ret = 0;
+
+    if (!state)
+        return -1;
+    fd = TEMP_FAILURE_RETRY(open(WIFI_DRIVER_STATE_CTRL_PARAM, O_WRONLY));
+    if (fd < 0) {
+        ALOGE("Failed to open driver state control param (%s)", strerror(errno));
+        return -1;
+    }
+    len = strlen(state) + 1;
+    if (TEMP_FAILURE_RETRY(write(fd, state, len)) != len) {
+        ALOGE("Failed to write driver state control param (%s)", strerror(errno));
+        ret = -1;
+    }
+    close(fd);
+    return ret;
+}
+#endif
+
+int is_wifi_driver_loaded() {
+    char driver_status[PROPERTY_VALUE_MAX];
+#ifdef WIFI_DRIVER_MODULE_PATH
+    FILE *proc;
+    char line[sizeof(DRIVER_MODULE_TAG)+10];
+#endif
+
+    if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
+            || strcmp(driver_status, "ok") != 0) {
+        return 0;  /* driver not loaded */
+    }
+#ifdef WIFI_DRIVER_MODULE_PATH
+    /*
+     * If the property says the driver is loaded, check to
+     * make sure that the property setting isn't just left
+     * over from a previous manual shutdown or a runtime
+     * crash.
+     */
+    if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
+        ALOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));
+        property_set(DRIVER_PROP_NAME, "unloaded");
+        return 0;
+    }
+    while ((fgets(line, sizeof(line), proc)) != NULL) {
+        if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
+            fclose(proc);
+            return 1;
+        }
+    }
+    fclose(proc);
+    property_set(DRIVER_PROP_NAME, "unloaded");
+    return 0;
+#else
+    return 1;
+#endif
+}
+
+int wifi_load_driver()
+{
+#ifdef WIFI_DRIVER_MODULE_PATH
+    char driver_status[PROPERTY_VALUE_MAX];
+    int count = 100; /* wait at most 20 seconds for completion */
+
+    if (is_wifi_driver_loaded()) {
+        return 0;
+    }
+
+    if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)
+        return -1;
+
+    if (strcmp(FIRMWARE_LOADER,"") == 0) {
+        /* usleep(WIFI_DRIVER_LOADER_DELAY); */
+        property_set(DRIVER_PROP_NAME, "ok");
+    }
+    else {
+        property_set("ctl.start", FIRMWARE_LOADER);
+    }
+    sched_yield();
+    while (count-- > 0) {
+        if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
+            if (strcmp(driver_status, "ok") == 0)
+                return 0;
+            else if (strcmp(driver_status, "failed") == 0) {
+                wifi_unload_driver();
+                return -1;
+            }
+        }
+        usleep(200000);
+    }
+    property_set(DRIVER_PROP_NAME, "timeout");
+    wifi_unload_driver();
+    return -1;
+#else
+#ifdef WIFI_DRIVER_STATE_CTRL_PARAM
+    if (is_wifi_driver_loaded()) {
+        return 0;
+    }
+
+    if (wifi_change_driver_state(WIFI_DRIVER_STATE_ON) < 0)
+        return -1;
+#endif
+    property_set(DRIVER_PROP_NAME, "ok");
+    return 0;
+#endif
+}
+
+int wifi_unload_driver()
+{
+    usleep(200000); /* allow to finish interface down */
+#ifdef WIFI_DRIVER_MODULE_PATH
+    if (rmmod(DRIVER_MODULE_NAME) == 0) {
+        int count = 20; /* wait at most 10 seconds for completion */
+        while (count-- > 0) {
+            if (!is_wifi_driver_loaded())
+                break;
+            usleep(500000);
+        }
+        usleep(500000); /* allow card removal */
+        if (count) {
+            return 0;
+        }
+        return -1;
+    } else
+        return -1;
+#else
+#ifdef WIFI_DRIVER_STATE_CTRL_PARAM
+    if (is_wifi_driver_loaded()) {
+        if (wifi_change_driver_state(WIFI_DRIVER_STATE_OFF) < 0)
+            return -1;
+    }
+#endif
+    property_set(DRIVER_PROP_NAME, "unloaded");
+    return 0;
+#endif
+}
+
+int ensure_entropy_file_exists()
+{
+    int ret;
+    int destfd;
+
+    ret = access(SUPP_ENTROPY_FILE, R_OK|W_OK);
+    if ((ret == 0) || (errno == EACCES)) {
+        if ((ret != 0) &&
+            (chmod(SUPP_ENTROPY_FILE, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) != 0)) {
+            ALOGE("Cannot set RW to \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno));
+            return -1;
+        }
+        return 0;
+    }
+    destfd = TEMP_FAILURE_RETRY(open(SUPP_ENTROPY_FILE, O_CREAT|O_RDWR, 0660));
+    if (destfd < 0) {
+        ALOGE("Cannot create \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno));
+        return -1;
+    }
+
+    if (TEMP_FAILURE_RETRY(write(destfd, dummy_key, sizeof(dummy_key))) != sizeof(dummy_key)) {
+        ALOGE("Error writing \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno));
+        close(destfd);
+        return -1;
+    }
+    close(destfd);
+
+    /* chmod is needed because open() didn't set permisions properly */
+    if (chmod(SUPP_ENTROPY_FILE, 0660) < 0) {
+        ALOGE("Error changing permissions of %s to 0660: %s",
+             SUPP_ENTROPY_FILE, strerror(errno));
+        unlink(SUPP_ENTROPY_FILE);
+        return -1;
+    }
+
+    if (chown(SUPP_ENTROPY_FILE, AID_SYSTEM, AID_WIFI) < 0) {
+        ALOGE("Error changing group ownership of %s to %d: %s",
+             SUPP_ENTROPY_FILE, AID_WIFI, strerror(errno));
+        unlink(SUPP_ENTROPY_FILE);
+        return -1;
+    }
+    return 0;
+}
+
+int ensure_config_file_exists(const char *config_file, const char *config_file_template)
+{
+    char buf[2048];
+    int srcfd, destfd;
+    struct stat sb;
+    int nread;
+    int ret;
+
+    ret = access(config_file, R_OK|W_OK);
+    if ((ret == 0) || (errno == EACCES)) {
+        if ((ret != 0) &&
+            (chmod(config_file, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) != 0)) {
+            ALOGE("Cannot set RW to \"%s\": %s", config_file, strerror(errno));
+            return -1;
+        }
+        return 0;
+    } else if (errno != ENOENT) {
+        ALOGE("Cannot access \"%s\": %s", config_file, strerror(errno));
+        return -1;
+    }
+
+    srcfd = TEMP_FAILURE_RETRY(open(config_file_template, O_RDONLY));
+    if (srcfd < 0) {
+        ALOGE("Cannot open \"%s\": %s", config_file_template, strerror(errno));
+        return -1;
+    }
+
+    destfd = TEMP_FAILURE_RETRY(open(config_file, O_CREAT|O_RDWR, 0660));
+    if (destfd < 0) {
+        close(srcfd);
+        ALOGE("Cannot create \"%s\": %s", config_file, strerror(errno));
+        return -1;
+    }
+
+    while ((nread = TEMP_FAILURE_RETRY(read(srcfd, buf, sizeof(buf)))) != 0) {
+        if (nread < 0) {
+            ALOGE("Error reading \"%s\": %s", config_file_template, strerror(errno));
+            close(srcfd);
+            close(destfd);
+            unlink(config_file);
+            return -1;
+        }
+        TEMP_FAILURE_RETRY(write(destfd, buf, nread));
+    }
+
+    close(destfd);
+    close(srcfd);
+
+    /* chmod is needed because open() didn't set permisions properly */
+    if (chmod(config_file, 0660) < 0) {
+        ALOGE("Error changing permissions of %s to 0660: %s",
+             config_file, strerror(errno));
+        unlink(config_file);
+        return -1;
+    }
+
+    if (chown(config_file, AID_SYSTEM, AID_WIFI) < 0) {
+        ALOGE("Error changing group ownership of %s to %d: %s",
+             config_file, AID_WIFI, strerror(errno));
+        unlink(config_file);
+        return -1;
+    }
+    return 0;
+}
+
+int wifi_start_supplicant(int p2p_supported)
+{
+    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
+    int count = 200; /* wait at most 20 seconds for completion */
+    const prop_info *pi;
+    unsigned serial = 0, i;
+
+    if (p2p_supported) {
+        strcpy(supplicant_name, P2P_SUPPLICANT_NAME);
+        strcpy(supplicant_prop_name, P2P_PROP_NAME);
+
+        /* Ensure p2p config file is created */
+        if (ensure_config_file_exists(P2P_CONFIG_FILE, SUPP_CONFIG_TEMPLATE) < 0) {
+            ALOGE("Failed to create a p2p config file");
+            return -1;
+        }
+
+    } else {
+        strcpy(supplicant_name, SUPPLICANT_NAME);
+        strcpy(supplicant_prop_name, SUPP_PROP_NAME);
+    }
+
+    /* Check whether already running */
+    if (property_get(supplicant_prop_name, supp_status, NULL)
+            && strcmp(supp_status, "running") == 0) {
+        return 0;
+    }
+
+    /* Before starting the daemon, make sure its config file exists */
+    if (ensure_config_file_exists(SUPP_CONFIG_FILE, SUPP_CONFIG_TEMPLATE) < 0) {
+        ALOGE("Wi-Fi will not be enabled");
+        return -1;
+    }
+
+    if (ensure_entropy_file_exists() < 0) {
+        ALOGE("Wi-Fi entropy file was not created");
+    }
+
+    /* Clear out any stale socket files that might be left over. */
+    wpa_ctrl_cleanup();
+
+    /* Reset sockets used for exiting from hung state */
+    exit_sockets[0] = exit_sockets[1] = -1;
+
+    /*
+     * Get a reference to the status property, so we can distinguish
+     * the case where it goes stopped => running => stopped (i.e.,
+     * it start up, but fails right away) from the case in which
+     * it starts in the stopped state and never manages to start
+     * running at all.
+     */
+    pi = __system_property_find(supplicant_prop_name);
+    if (pi != NULL) {
+        serial = __system_property_serial(pi);
+    }
+    property_get("wifi.interface", primary_iface, WIFI_TEST_INTERFACE);
+
+    property_set("ctl.start", supplicant_name);
+    sched_yield();
+
+    while (count-- > 0) {
+        if (pi == NULL) {
+            pi = __system_property_find(supplicant_prop_name);
+        }
+        if (pi != NULL) {
+            /*
+             * property serial updated means that init process is scheduled
+             * after we sched_yield, further property status checking is based on this */
+            if (__system_property_serial(pi) != serial) {
+                __system_property_read(pi, NULL, supp_status);
+                if (strcmp(supp_status, "running") == 0) {
+                    return 0;
+                } else if (strcmp(supp_status, "stopped") == 0) {
+                    return -1;
+                }
+            }
+        }
+        usleep(100000);
+    }
+    return -1;
+}
+
+int wifi_stop_supplicant(int p2p_supported)
+{
+    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
+    int count = 50; /* wait at most 5 seconds for completion */
+
+    if (p2p_supported) {
+        strcpy(supplicant_name, P2P_SUPPLICANT_NAME);
+        strcpy(supplicant_prop_name, P2P_PROP_NAME);
+    } else {
+        strcpy(supplicant_name, SUPPLICANT_NAME);
+        strcpy(supplicant_prop_name, SUPP_PROP_NAME);
+    }
+
+    /* Check whether supplicant already stopped */
+    if (property_get(supplicant_prop_name, supp_status, NULL)
+        && strcmp(supp_status, "stopped") == 0) {
+        return 0;
+    }
+
+    property_set("ctl.stop", supplicant_name);
+    sched_yield();
+
+    while (count-- > 0) {
+        if (property_get(supplicant_prop_name, supp_status, NULL)) {
+            if (strcmp(supp_status, "stopped") == 0)
+                return 0;
+        }
+        usleep(100000);
+    }
+    ALOGE("Failed to stop supplicant");
+    return -1;
+}
+
+int wifi_connect_on_socket_path(const char *path)
+{
+    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
+
+    /* Make sure supplicant is running */
+    if (!property_get(supplicant_prop_name, supp_status, NULL)
+            || strcmp(supp_status, "running") != 0) {
+        ALOGE("Supplicant not running, cannot connect");
+        return -1;
+    }
+
+    ctrl_conn = wpa_ctrl_open(path);
+    if (ctrl_conn == NULL) {
+        ALOGE("Unable to open connection to supplicant on \"%s\": %s",
+             path, strerror(errno));
+        return -1;
+    }
+    monitor_conn = wpa_ctrl_open(path);
+    if (monitor_conn == NULL) {
+        wpa_ctrl_close(ctrl_conn);
+        ctrl_conn = NULL;
+        return -1;
+    }
+    if (wpa_ctrl_attach(monitor_conn) != 0) {
+        wpa_ctrl_close(monitor_conn);
+        wpa_ctrl_close(ctrl_conn);
+        ctrl_conn = monitor_conn = NULL;
+        return -1;
+    }
+
+    if (socketpair(AF_UNIX, SOCK_STREAM, 0, exit_sockets) == -1) {
+        wpa_ctrl_close(monitor_conn);
+        wpa_ctrl_close(ctrl_conn);
+        ctrl_conn = monitor_conn = NULL;
+        return -1;
+    }
+
+    return 0;
+}
+
+/* Establishes the control and monitor socket connections on the interface */
+int wifi_connect_to_supplicant()
+{
+    static char path[PATH_MAX];
+
+    if (access(IFACE_DIR, F_OK) == 0) {
+        snprintf(path, sizeof(path), "%s/%s", IFACE_DIR, primary_iface);
+    } else {
+        snprintf(path, sizeof(path), "@android:wpa_%s", primary_iface);
+    }
+    return wifi_connect_on_socket_path(path);
+}
+
+int wifi_send_command(const char *cmd, char *reply, size_t *reply_len)
+{
+    int ret;
+    if (ctrl_conn == NULL) {
+        ALOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
+        return -1;
+    }
+    ret = wpa_ctrl_request(ctrl_conn, cmd, strlen(cmd), reply, reply_len, NULL);
+    if (ret == -2) {
+        ALOGD("'%s' command timed out.\n", cmd);
+        /* unblocks the monitor receive socket for termination */
+        TEMP_FAILURE_RETRY(write(exit_sockets[0], "T", 1));
+        return -2;
+    } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
+        return -1;
+    }
+    if (strncmp(cmd, "PING", 4) == 0) {
+        reply[*reply_len] = '\0';
+    }
+    return 0;
+}
+
+int wifi_supplicant_connection_active()
+{
+    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
+
+    if (property_get(supplicant_prop_name, supp_status, NULL)) {
+        if (strcmp(supp_status, "stopped") == 0)
+            return -1;
+    }
+
+    return 0;
+}
+
+int wifi_ctrl_recv(char *reply, size_t *reply_len)
+{
+    int res;
+    int ctrlfd = wpa_ctrl_get_fd(monitor_conn);
+    struct pollfd rfds[2];
+
+    memset(rfds, 0, 2 * sizeof(struct pollfd));
+    rfds[0].fd = ctrlfd;
+    rfds[0].events |= POLLIN;
+    rfds[1].fd = exit_sockets[1];
+    rfds[1].events |= POLLIN;
+    do {
+        res = TEMP_FAILURE_RETRY(poll(rfds, 2, 30000));
+        if (res < 0) {
+            ALOGE("Error poll = %d", res);
+            return res;
+        } else if (res == 0) {
+            /* timed out, check if supplicant is active
+             * or not ..
+             */
+            res = wifi_supplicant_connection_active();
+            if (res < 0)
+                return -2;
+        }
+    } while (res == 0);
+
+    if (rfds[0].revents & POLLIN) {
+        return wpa_ctrl_recv(monitor_conn, reply, reply_len);
+    }
+
+    /* it is not rfds[0], then it must be rfts[1] (i.e. the exit socket)
+     * or we timed out. In either case, this call has failed ..
+     */
+    return -2;
+}
+
+int wifi_wait_on_socket(char *buf, size_t buflen)
+{
+    size_t nread = buflen - 1;
+    int result;
+    char *match, *match2;
+
+    if (monitor_conn == NULL) {
+        return snprintf(buf, buflen, "IFNAME=%s %s - connection closed",
+                        primary_iface, WPA_EVENT_TERMINATING);
+    }
+
+    result = wifi_ctrl_recv(buf, &nread);
+
+    /* Terminate reception on exit socket */
+    if (result == -2) {
+        return snprintf(buf, buflen, "IFNAME=%s %s - connection closed",
+                        primary_iface, WPA_EVENT_TERMINATING);
+    }
+
+    if (result < 0) {
+        ALOGD("wifi_ctrl_recv failed: %s\n", strerror(errno));
+        return snprintf(buf, buflen, "IFNAME=%s %s - recv error",
+                        primary_iface, WPA_EVENT_TERMINATING);
+    }
+    buf[nread] = '\0';
+    /* Check for EOF on the socket */
+    if (result == 0 && nread == 0) {
+        /* Fabricate an event to pass up */
+        ALOGD("Received EOF on supplicant socket\n");
+        return snprintf(buf, buflen, "IFNAME=%s %s - signal 0 received",
+                        primary_iface, WPA_EVENT_TERMINATING);
+    }
+    /*
+     * Events strings are in the format
+     *
+     *     IFNAME=iface <N>CTRL-EVENT-XXX 
+     *        or
+     *     <N>CTRL-EVENT-XXX 
+     *
+     * where N is the message level in numerical form (0=VERBOSE, 1=DEBUG,
+     * etc.) and XXX is the event name. The level information is not useful
+     * to us, so strip it off.
+     */
+
+    if (strncmp(buf, IFNAME, IFNAMELEN) == 0) {
+        match = strchr(buf, ' ');
+        if (match != NULL) {
+            if (match[1] == '<') {
+                match2 = strchr(match + 2, '>');
+                if (match2 != NULL) {
+                    nread -= (match2 - match);
+                    memmove(match + 1, match2 + 1, nread - (match - buf) + 1);
+                }
+            }
+        } else {
+            return snprintf(buf, buflen, "%s", WPA_EVENT_IGNORE);
+        }
+    } else if (buf[0] == '<') {
+        match = strchr(buf, '>');
+        if (match != NULL) {
+            nread -= (match + 1 - buf);
+            memmove(buf, match + 1, nread + 1);
+            ALOGV("supplicant generated event without interface - %s\n", buf);
+        }
+    } else {
+        /* let the event go as is! */
+        ALOGW("supplicant generated event without interface and without message level - %s\n", buf);
+    }
+
+    return nread;
+}
+
+int wifi_wait_for_event(char *buf, size_t buflen)
+{
+    return wifi_wait_on_socket(buf, buflen);
+}
+
+void wifi_close_sockets()
+{
+    if (ctrl_conn != NULL) {
+        wpa_ctrl_close(ctrl_conn);
+        ctrl_conn = NULL;
+    }
+
+    if (monitor_conn != NULL) {
+        wpa_ctrl_close(monitor_conn);
+        monitor_conn = NULL;
+    }
+
+    if (exit_sockets[0] >= 0) {
+        close(exit_sockets[0]);
+        exit_sockets[0] = -1;
+    }
+
+    if (exit_sockets[1] >= 0) {
+        close(exit_sockets[1]);
+        exit_sockets[1] = -1;
+    }
+}
+
+void wifi_close_supplicant_connection()
+{
+    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
+    int count = 50; /* wait at most 5 seconds to ensure init has stopped stupplicant */
+
+    wifi_close_sockets();
+
+    while (count-- > 0) {
+        if (property_get(supplicant_prop_name, supp_status, NULL)) {
+            if (strcmp(supp_status, "stopped") == 0)
+                return;
+        }
+        usleep(100000);
+    }
+}
+
+int wifi_command(const char *command, char *reply, size_t *reply_len)
+{
+    return wifi_send_command(command, reply, reply_len);
+}
+
+const char *wifi_get_fw_path(int fw_type)
+{
+    switch (fw_type) {
+    case WIFI_GET_FW_PATH_STA:
+        return WIFI_DRIVER_FW_PATH_STA;
+    case WIFI_GET_FW_PATH_AP:
+        return WIFI_DRIVER_FW_PATH_AP;
+    case WIFI_GET_FW_PATH_P2P:
+        return WIFI_DRIVER_FW_PATH_P2P;
+    }
+    return NULL;
+}
+
+int wifi_change_fw_path(const char *fwpath)
+{
+    int len;
+    int fd;
+    int ret = 0;
+
+    if (!fwpath)
+        return ret;
+    fd = TEMP_FAILURE_RETRY(open(WIFI_DRIVER_FW_PATH_PARAM, O_WRONLY));
+    if (fd < 0) {
+        ALOGE("Failed to open wlan fw path param (%s)", strerror(errno));
+        return -1;
+    }
+    len = strlen(fwpath) + 1;
+    if (TEMP_FAILURE_RETRY(write(fd, fwpath, len)) != len) {
+        ALOGE("Failed to write wlan fw path param (%s)", strerror(errno));
+        ret = -1;
+    }
+    close(fd);
+    return ret;
+}