1 /* 2 * Copyright (C) 2008 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 #include <stdlib.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <string.h> 21 22 #include <sys/socket.h> 23 #include <sys/stat.h> 24 #include <sys/ioctl.h> 25 #include <sys/types.h> 26 #include <sys/wait.h> 27 28 #include <netinet/in.h> 29 #include <arpa/inet.h> 30 31 #include <linux/wireless.h> 32 33 #include <openssl/evp.h> 34 #include <openssl/sha.h> 35 36 #define LOG_TAG "SoftapController" 37 #include <cutils/log.h> 38 #include <netutils/ifc.h> 39 #include <private/android_filesystem_config.h> 40 #include "wifi.h" 41 #include "ResponseCode.h" 42 43 #include "SoftapController.h" 44 45 static const char HOSTAPD_CONF_FILE[] = "/data/misc/wifi/hostapd.conf"; 46 static const char HOSTAPD_BIN_FILE[] = "/system/bin/hostapd"; 47 48 SoftapController::SoftapController() 49 : mPid(0) {} 50 51 SoftapController::~SoftapController() { 52 } 53 54 int SoftapController::startSoftap() { 55 pid_t pid = 1; 56 57 if (mPid) { 58 ALOGE("SoftAP is already running"); 59 return ResponseCode::SoftapStatusResult; 60 } 61 62 if ((pid = fork()) < 0) { 63 ALOGE("fork failed (%s)", strerror(errno)); 64 return ResponseCode::ServiceStartFailed; 65 } 66 67 if (!pid) { 68 ensure_entropy_file_exists(); 69 if (execl(HOSTAPD_BIN_FILE, HOSTAPD_BIN_FILE, 70 "-e", WIFI_ENTROPY_FILE, 71 HOSTAPD_CONF_FILE, (char *) NULL)) { 72 ALOGE("execl failed (%s)", strerror(errno)); 73 } 74 ALOGE("SoftAP failed to start"); 75 return ResponseCode::ServiceStartFailed; 76 } else { 77 mPid = pid; 78 ALOGD("SoftAP started successfully"); 79 usleep(AP_BSS_START_DELAY); 80 } 81 return ResponseCode::SoftapStatusResult; 82 } 83 84 int SoftapController::stopSoftap() { 85 86 if (mPid == 0) { 87 ALOGE("SoftAP is not running"); 88 return ResponseCode::SoftapStatusResult; 89 } 90 91 ALOGD("Stopping the SoftAP service..."); 92 kill(mPid, SIGTERM); 93 waitpid(mPid, NULL, 0); 94 95 mPid = 0; 96 ALOGD("SoftAP stopped successfully"); 97 usleep(AP_BSS_STOP_DELAY); 98 return ResponseCode::SoftapStatusResult; 99 } 100 101 bool SoftapController::isSoftapStarted() { 102 return (mPid != 0); 103 } 104 105 /* 106 * Arguments: 107 * argv[2] - wlan interface 108 * argv[3] - SSID 109 * argv[4] - Security 110 * argv[5] - Key 111 */ 112 int SoftapController::setSoftap(int argc, char *argv[]) { 113 char psk_str[2*SHA256_DIGEST_LENGTH+1]; 114 int ret = ResponseCode::SoftapStatusResult; 115 int i = 0; 116 int fd; 117 118 if (argc < 4) { 119 ALOGE("Softap set is missing arguments. Please use: softap <wlan iface> <SSID> <wpa2?-psk|open> <passphrase>"); 120 return ResponseCode::CommandSyntaxError; 121 } 122 123 char *wbuf = NULL; 124 char *fbuf = NULL; 125 126 asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface=" 127 "/data/misc/wifi/hostapd\nssid=%s\nchannel=6\nieee80211n=1\n" 128 "hw_mode=g\n", 129 argv[2], argv[3]); 130 131 if (argc > 4) { 132 if (!strcmp(argv[4], "wpa-psk")) { 133 generatePsk(argv[3], argv[5], psk_str); 134 asprintf(&fbuf, "%swpa=1\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf, psk_str); 135 } else if (!strcmp(argv[4], "wpa2-psk")) { 136 generatePsk(argv[3], argv[5], psk_str); 137 asprintf(&fbuf, "%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf, psk_str); 138 } else if (!strcmp(argv[4], "open")) { 139 asprintf(&fbuf, "%s", wbuf); 140 } 141 } else { 142 asprintf(&fbuf, "%s", wbuf); 143 } 144 145 fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW, 0660); 146 if (fd < 0) { 147 ALOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno)); 148 free(wbuf); 149 free(fbuf); 150 return ResponseCode::OperationFailed; 151 } 152 if (write(fd, fbuf, strlen(fbuf)) < 0) { 153 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno)); 154 ret = ResponseCode::OperationFailed; 155 } 156 free(wbuf); 157 free(fbuf); 158 159 /* Note: apparently open can fail to set permissions correctly at times */ 160 if (fchmod(fd, 0660) < 0) { 161 ALOGE("Error changing permissions of %s to 0660: %s", 162 HOSTAPD_CONF_FILE, strerror(errno)); 163 close(fd); 164 unlink(HOSTAPD_CONF_FILE); 165 return ResponseCode::OperationFailed; 166 } 167 168 if (fchown(fd, AID_SYSTEM, AID_WIFI) < 0) { 169 ALOGE("Error changing group ownership of %s to %d: %s", 170 HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno)); 171 close(fd); 172 unlink(HOSTAPD_CONF_FILE); 173 return ResponseCode::OperationFailed; 174 } 175 176 close(fd); 177 return ret; 178 } 179 180 /* 181 * Arguments: 182 * argv[2] - interface name 183 * argv[3] - AP or P2P or STA 184 */ 185 int SoftapController::fwReloadSoftap(int argc, char *argv[]) 186 { 187 int i = 0; 188 char *fwpath = NULL; 189 190 if (argc < 4) { 191 ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>"); 192 return ResponseCode::CommandSyntaxError; 193 } 194 195 if (strcmp(argv[3], "AP") == 0) { 196 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP); 197 } else if (strcmp(argv[3], "P2P") == 0) { 198 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P); 199 } else if (strcmp(argv[3], "STA") == 0) { 200 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA); 201 } 202 if (!fwpath) 203 return ResponseCode::CommandParameterError; 204 if (wifi_change_fw_path((const char *)fwpath)) { 205 ALOGE("Softap fwReload failed"); 206 return ResponseCode::OperationFailed; 207 } 208 else { 209 ALOGD("Softap fwReload - Ok"); 210 } 211 return ResponseCode::SoftapStatusResult; 212 } 213 214 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) { 215 unsigned char psk[SHA256_DIGEST_LENGTH]; 216 int j; 217 // Use the PKCS#5 PBKDF2 with 4096 iterations 218 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase), 219 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid), 220 4096, SHA256_DIGEST_LENGTH, psk); 221 for (j=0; j < SHA256_DIGEST_LENGTH; j++) { 222 sprintf(&psk_str[j*2], "%02x", psk[j]); 223 } 224 } 225
