/* * 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 "hardware/wifi.h"#include "libwpa_client/wpa_ctrl.h"#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"static struct wpa_ctrl *ctrl_conn;static struct wpa_ctrl *monitor_conn;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);static char iface[PROPERTY_VALUE_MAX];// TODO: use new ANDROID_SOCKET mechanism, once support for multiple// sockets is instatic const char IFACE_DIR[]           = "/data/system/wpa_supplicant";static const char DRIVER_MODULE_NAME[]  = "wlan";static const char DRIVER_MODULE_TAG[]   = "wlan ";static const char DRIVER_MODULE_PATH[]  = "/system/lib/modules/wlan.ko";static const char FIRMWARE_LOADER[]     = "wlan_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 SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf";static const char SUPP_CONFIG_FILE[]    = "/data/misc/wifi/wpa_supplicant.conf";static const char MODULE_FILE[]         = "/proc/modules";static int insmod(const char *filename){    void *module;    unsigned int size;    int ret;    module = load_file(filename, &size);    if (!module)        return -1;    ret = init_module(module, size, "");    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)        LOGD("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(iface, "sta") == 0)        return 0;    if (ifc_init() < 0)        return -1;    if (do_dhcp(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();}static int check_driver_loaded() {    char driver_status[PROPERTY_VALUE_MAX];    FILE *proc;    char line[sizeof(DRIVER_MODULE_TAG)+10];    if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)            || strcmp(driver_status, "ok") != 0) {        return 0;  /* driver not loaded */    }    /*     * 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) {        LOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));        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;}int wifi_load_driver(){    char driver_status[PROPERTY_VALUE_MAX];    int count = 40; /* wait at most 20 seconds for completion */    if (check_driver_loaded()) {        return 0;    }    insmod(DRIVER_MODULE_PATH);    property_set("ctl.start", FIRMWARE_LOADER);    while (count-- > 0) {        usleep(500000);        if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {            if (strcmp(driver_status, "ok") == 0)                return 0;            else if (strcmp(DRIVER_PROP_NAME, "failed") == 0)                return -1;        }    }    property_set(DRIVER_PROP_NAME, "timeout");    return -1;}int wifi_unload_driver(){    if (rmmod(DRIVER_MODULE_NAME) == 0) {        usleep(1000000);        property_set(DRIVER_PROP_NAME, "unloaded");        return 0;    } else        return -1;}static int control_supplicant(int startIt){    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};    const char *ctrl_prop = (startIt ? "ctl.start" : "ctl.stop");    const char *desired_status = (startIt ? "running" : "stopped");    int count = 20; /* wait at most 20 seconds for completion */    if (property_get(SUPP_PROP_NAME, supp_status, NULL)        && strcmp(supp_status, desired_status) == 0) {        return 0;  /* supplicant already running */    }    property_set(ctrl_prop, SUPPLICANT_NAME);    while (count-- > 0) {        usleep(1000000);        if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {            if (strcmp(supp_status, desired_status) == 0)                return 0;        }    }    return -1;}int ensure_config_file_exists(){    char buf[2048];    int srcfd, destfd;    int nread;    if (access(SUPP_CONFIG_FILE, R_OK|W_OK) == 0) {        return 0;    } else if (errno != ENOENT) {        LOGE("Cannot access \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));        return -1;    }    srcfd = open(SUPP_CONFIG_TEMPLATE, O_RDONLY);    if (srcfd < 0) {        LOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));        return -1;    }    destfd = open(SUPP_CONFIG_FILE, O_CREAT|O_WRONLY, 0660);    if (destfd < 0) {        close(srcfd);        LOGE("Cannot create \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));        return -1;    }    while ((nread = read(srcfd, buf, sizeof(buf))) != 0) {        if (nread < 0) {            LOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));            close(srcfd);            close(destfd);            unlink(SUPP_CONFIG_FILE);            return -1;        }        write(destfd, buf, nread);    }    close(destfd);    close(srcfd);    if (chown(SUPP_CONFIG_FILE, AID_SYSTEM, AID_WIFI) < 0) {        LOGE("Error changing group ownership of %s to %d: %s",             SUPP_CONFIG_FILE, AID_WIFI, strerror(errno));        unlink(SUPP_CONFIG_FILE);        return -1;    }    return 0;}int wifi_start_supplicant(){    /* Before starting the daemon, make sure its config file exists */    if (ensure_config_file_exists() < 0) {        LOGE("Wi-Fi will not be enabled");        return -1;    }    return control_supplicant(1);}int wifi_stop_supplicant(){    return control_supplicant(0);}int wifi_connect_to_supplicant(){    char ifname[256];    static int cleaned_up = 0;    property_get("wifi.interface", iface, "sta");    if (access(IFACE_DIR, F_OK) == 0) {        snprintf(ifname, sizeof(ifname), "%s/%s", IFACE_DIR, iface);    } else {        strlcpy(ifname, iface, sizeof(ifname));    }    ctrl_conn = wpa_ctrl_open(ifname);    if (ctrl_conn == NULL) {        LOGD("Unable to open connection to supplicant on \"%s\": %s",             ifname, strerror(errno));        /*         * errno == ENOENT means the supplicant daemon isn't         * running. Take this opportunity to clear out any         * stale socket files that might be left over. Note         * there's a possible race with the command line client         * trying to connect to the daemon, but it would require         * that the supplicant be started and the command line         * client connect to it during the window between the         * error check and the removal of the files. And in         * any event, the remedy is that the user would simply         * have to run the command line program again.         */        if (!cleaned_up && (errno == ENOENT || errno == EADDRINUSE)) {            cleaned_up = 1; /* do this just once */            wpa_ctrl_cleanup();        }        return -1;    }    monitor_conn = wpa_ctrl_open(ifname);    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;    }    return 0;}int wifi_send_command(struct wpa_ctrl *ctrl, const char *cmd, char *reply, size_t *reply_len){    int ret;    if (ctrl_conn == NULL) {        LOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);        return -1;    }    ret = wpa_ctrl_request(ctrl, cmd, strlen(cmd), reply, reply_len, NULL);    if (ret == -2) {        LOGD("'%s' command timed out.\n", cmd);        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_wait_for_event(char *buf, size_t buflen){    size_t nread = buflen - 1;    int fd;    fd_set rfds;    int result;    struct timeval tval;    struct timeval *tptr;        if (monitor_conn == NULL)        return 0;    result = wpa_ctrl_recv(monitor_conn, buf, &nread);    if (result < 0) {        LOGD("wpa_ctrl_recv failed: %s\n", strerror(errno));        return -1;    }    buf[nread] = '\0';    /* LOGD("wait_for_event: result=%d nread=%d string=\"%s\"\n", result, nread, buf); */    /* Check for EOF on the socket */    if (result == 0 && nread == 0) {        /* Fabricate an event to pass up */        LOGD("Received EOF on supplicant socket\n");        strncpy(buf, WPA_EVENT_TERMINATING " - signal 0 received", buflen-1);        buf[buflen-1] = '\0';        return strlen(buf);    }    /*     * Events strings are in the format     *     *     <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 (buf[0] == '<') {        char *match = strchr(buf, '>');        if (match != NULL) {            nread -= (match+1-buf);            memmove(buf, match+1, nread+1);        }    }    return nread;}void wifi_close_supplicant_connection(){    if (ctrl_conn != NULL) {        wpa_ctrl_close(ctrl_conn);        ctrl_conn = NULL;    }    if (monitor_conn != NULL) {        wpa_ctrl_close(monitor_conn);        monitor_conn = NULL;    }}int wifi_command(const char *command, char *reply, size_t *reply_len){    return wifi_send_command(ctrl_conn, command, reply, reply_len);}