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 42 #include "SoftapController.h" 43 44 static const char HOSTAPD_CONF_FILE[] = "/data/misc/wifi/hostapd.conf"; 45 46 SoftapController::SoftapController() { 47 mPid = 0; 48 mSock = socket(AF_INET, SOCK_DGRAM, 0); 49 if (mSock < 0) 50 ALOGE("Failed to open socket"); 51 } 52 53 SoftapController::~SoftapController() { 54 if (mSock >= 0) 55 close(mSock); 56 } 57 58 int SoftapController::startSoftap() { 59 pid_t pid = 1; 60 int ret = 0; 61 62 if (mPid) { 63 ALOGE("Softap already started"); 64 return 0; 65 } 66 if (mSock < 0) { 67 ALOGE("Softap startap - failed to open socket"); 68 return -1; 69 } 70 71 if ((pid = fork()) < 0) { 72 ALOGE("fork failed (%s)", strerror(errno)); 73 return -1; 74 } 75 76 if (!pid) { 77 ensure_entropy_file_exists(); 78 if (execl("/system/bin/hostapd", "/system/bin/hostapd", 79 "-e", WIFI_ENTROPY_FILE, 80 HOSTAPD_CONF_FILE, (char *) NULL)) { 81 ALOGE("execl failed (%s)", strerror(errno)); 82 } 83 ALOGE("Should never get here!"); 84 return -1; 85 } else { 86 mPid = pid; 87 ALOGD("Softap startap - Ok"); 88 usleep(AP_BSS_START_DELAY); 89 } 90 return ret; 91 92 } 93 94 int SoftapController::stopSoftap() { 95 96 if (mPid == 0) { 97 ALOGE("Softap already stopped"); 98 return 0; 99 } 100 101 ALOGD("Stopping Softap service"); 102 kill(mPid, SIGTERM); 103 waitpid(mPid, NULL, 0); 104 105 if (mSock < 0) { 106 ALOGE("Softap stopap - failed to open socket"); 107 return -1; 108 } 109 mPid = 0; 110 ALOGD("Softap service stopped"); 111 usleep(AP_BSS_STOP_DELAY); 112 return 0; 113 } 114 115 bool SoftapController::isSoftapStarted() { 116 return (mPid != 0 ? true : false); 117 } 118 119 /* 120 * Arguments: 121 * argv[2] - wlan interface 122 * argv[3] - SSID 123 * argv[4] - Security 124 * argv[5] - Key 125 * argv[6] - Channel 126 * argv[7] - Preamble 127 * argv[8] - Max SCB 128 */ 129 int SoftapController::setSoftap(int argc, char *argv[]) { 130 char psk_str[2*SHA256_DIGEST_LENGTH+1]; 131 int ret = 0, i = 0, fd; 132 char *ssid, *iface; 133 134 if (mSock < 0) { 135 ALOGE("Softap set - failed to open socket"); 136 return -1; 137 } 138 if (argc < 4) { 139 ALOGE("Softap set - missing arguments"); 140 return -1; 141 } 142 143 iface = argv[2]; 144 145 char *wbuf = NULL; 146 char *fbuf = NULL; 147 148 if (argc > 3) { 149 ssid = argv[3]; 150 } else { 151 ssid = (char *)"AndroidAP"; 152 } 153 154 asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface=" 155 "/data/misc/wifi/hostapd\nssid=%s\nchannel=6\nieee80211n=1\n", 156 iface, ssid); 157 158 if (argc > 4) { 159 if (!strcmp(argv[4], "wpa-psk")) { 160 generatePsk(ssid, argv[5], psk_str); 161 asprintf(&fbuf, "%swpa=1\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf, psk_str); 162 } else if (!strcmp(argv[4], "wpa2-psk")) { 163 generatePsk(ssid, argv[5], psk_str); 164 asprintf(&fbuf, "%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf, psk_str); 165 } else if (!strcmp(argv[4], "open")) { 166 asprintf(&fbuf, "%s", wbuf); 167 } 168 } else { 169 asprintf(&fbuf, "%s", wbuf); 170 } 171 172 fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY, 0660); 173 if (fd < 0) { 174 ALOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno)); 175 free(wbuf); 176 free(fbuf); 177 return -1; 178 } 179 if (write(fd, fbuf, strlen(fbuf)) < 0) { 180 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno)); 181 ret = -1; 182 } 183 close(fd); 184 free(wbuf); 185 free(fbuf); 186 187 /* Note: apparently open can fail to set permissions correctly at times */ 188 if (chmod(HOSTAPD_CONF_FILE, 0660) < 0) { 189 ALOGE("Error changing permissions of %s to 0660: %s", 190 HOSTAPD_CONF_FILE, strerror(errno)); 191 unlink(HOSTAPD_CONF_FILE); 192 return -1; 193 } 194 195 if (chown(HOSTAPD_CONF_FILE, AID_SYSTEM, AID_WIFI) < 0) { 196 ALOGE("Error changing group ownership of %s to %d: %s", 197 HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno)); 198 unlink(HOSTAPD_CONF_FILE); 199 return -1; 200 } 201 202 return ret; 203 } 204 205 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) { 206 unsigned char psk[SHA256_DIGEST_LENGTH]; 207 int j; 208 // Use the PKCS#5 PBKDF2 with 4096 iterations 209 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase), 210 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid), 211 4096, SHA256_DIGEST_LENGTH, psk); 212 for (j=0; j < SHA256_DIGEST_LENGTH; j++) { 213 sprintf(&psk_str[j<<1], "%02x", psk[j]); 214 } 215 psk_str[j<<1] = '\0'; 216 } 217 218 219 /* 220 * Arguments: 221 * argv[2] - interface name 222 * argv[3] - AP or STA 223 */ 224 int SoftapController::fwReloadSoftap(int argc, char *argv[]) 225 { 226 int ret, i = 0; 227 char *iface; 228 char *fwpath; 229 230 if (mSock < 0) { 231 ALOGE("Softap fwrealod - failed to open socket"); 232 return -1; 233 } 234 if (argc < 4) { 235 ALOGE("Softap fwreload - missing arguments"); 236 return -1; 237 } 238 239 iface = argv[2]; 240 241 if (strcmp(argv[3], "AP") == 0) { 242 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP); 243 } else if (strcmp(argv[3], "P2P") == 0) { 244 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P); 245 } else { 246 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA); 247 } 248 if (!fwpath) 249 return -1; 250 ret = wifi_change_fw_path((const char *)fwpath); 251 if (ret) { 252 ALOGE("Softap fwReload - failed: %d", ret); 253 } 254 else { 255 ALOGD("Softap fwReload - Ok"); 256 } 257 return ret; 258 } 259 260 int SoftapController::clientsSoftap(char **retbuf) 261 { 262 /* TODO: implement over hostapd */ 263 return 0; 264 } 265
