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] - Broadcast/Hidden 110 * argv[5] - Channel 111 * argv[6] - Security 112 * argv[7] - Key 113 */ 114 int SoftapController::setSoftap(int argc, char *argv[]) { 115 char psk_str[2*SHA256_DIGEST_LENGTH+1]; 116 int ret = ResponseCode::SoftapStatusResult; 117 int i = 0; 118 int fd; 119 int hidden = 0; 120 int channel = AP_CHANNEL_DEFAULT; 121 char *wbuf = NULL; 122 char *fbuf = NULL; 123 124 if (argc < 5) { 125 ALOGE("Softap set is missing arguments. Please use:"); 126 ALOGE("softap <wlan iface> <SSID> <hidden/broadcast> <channel> <wpa2?-psk|open> <passphrase>"); 127 return ResponseCode::CommandSyntaxError; 128 } 129 130 if (!strcasecmp(argv[4], "hidden")) 131 hidden = 1; 132 133 if (argc >= 5) { 134 channel = atoi(argv[5]); 135 if (channel <= 0) 136 channel = AP_CHANNEL_DEFAULT; 137 } 138 139 asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface=" 140 "/data/misc/wifi/hostapd\nssid=%s\nchannel=%d\nieee80211n=1\n" 141 "hw_mode=g\nignore_broadcast_ssid=%d\n", 142 argv[2], argv[3], channel, hidden); 143 144 if (argc > 7) { 145 if (!strcmp(argv[6], "wpa-psk")) { 146 generatePsk(argv[3], argv[7], psk_str); 147 asprintf(&fbuf, "%swpa=1\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf, psk_str); 148 } else if (!strcmp(argv[6], "wpa2-psk")) { 149 generatePsk(argv[3], argv[7], psk_str); 150 asprintf(&fbuf, "%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf, psk_str); 151 } else if (!strcmp(argv[6], "open")) { 152 asprintf(&fbuf, "%s", wbuf); 153 } 154 } else if (argc > 6) { 155 if (!strcmp(argv[6], "open")) { 156 asprintf(&fbuf, "%s", wbuf); 157 } 158 } else { 159 asprintf(&fbuf, "%s", wbuf); 160 } 161 162 fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW, 0660); 163 if (fd < 0) { 164 ALOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno)); 165 free(wbuf); 166 free(fbuf); 167 return ResponseCode::OperationFailed; 168 } 169 if (write(fd, fbuf, strlen(fbuf)) < 0) { 170 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno)); 171 ret = ResponseCode::OperationFailed; 172 } 173 free(wbuf); 174 free(fbuf); 175 176 /* Note: apparently open can fail to set permissions correctly at times */ 177 if (fchmod(fd, 0660) < 0) { 178 ALOGE("Error changing permissions of %s to 0660: %s", 179 HOSTAPD_CONF_FILE, strerror(errno)); 180 close(fd); 181 unlink(HOSTAPD_CONF_FILE); 182 return ResponseCode::OperationFailed; 183 } 184 185 if (fchown(fd, AID_SYSTEM, AID_WIFI) < 0) { 186 ALOGE("Error changing group ownership of %s to %d: %s", 187 HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno)); 188 close(fd); 189 unlink(HOSTAPD_CONF_FILE); 190 return ResponseCode::OperationFailed; 191 } 192 193 close(fd); 194 return ret; 195 } 196 197 /* 198 * Arguments: 199 * argv[2] - interface name 200 * argv[3] - AP or P2P or STA 201 */ 202 int SoftapController::fwReloadSoftap(int argc, char *argv[]) 203 { 204 int i = 0; 205 char *fwpath = NULL; 206 207 if (argc < 4) { 208 ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>"); 209 return ResponseCode::CommandSyntaxError; 210 } 211 212 if (strcmp(argv[3], "AP") == 0) { 213 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP); 214 } else if (strcmp(argv[3], "P2P") == 0) { 215 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P); 216 } else if (strcmp(argv[3], "STA") == 0) { 217 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA); 218 } 219 if (!fwpath) 220 return ResponseCode::CommandParameterError; 221 if (wifi_change_fw_path((const char *)fwpath)) { 222 ALOGE("Softap fwReload failed"); 223 return ResponseCode::OperationFailed; 224 } 225 else { 226 ALOGD("Softap fwReload - Ok"); 227 } 228 return ResponseCode::SoftapStatusResult; 229 } 230 231 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) { 232 unsigned char psk[SHA256_DIGEST_LENGTH]; 233 int j; 234 // Use the PKCS#5 PBKDF2 with 4096 iterations 235 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase), 236 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid), 237 4096, SHA256_DIGEST_LENGTH, psk); 238 for (j=0; j < SHA256_DIGEST_LENGTH; j++) { 239 sprintf(&psk_str[j*2], "%02x", psk[j]); 240 } 241 } 242
