Sanket Khidkikar | 9f55c07 | 2014-06-18 11:58:46 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * Redistribution and use in source and binary forms, with or without |
| 4 | * modification, are permitted provided that the following conditions are |
| 5 | * met: |
| 6 | * * Redistributions of source code must retain the above copyright |
| 7 | * notice, this list of conditions and the following disclaimer. |
| 8 | * * Redistributions in binary form must reproduce the above |
| 9 | * copyright notice, this list of conditions and the following |
| 10 | * disclaimer in the documentation and/or other materials provided |
| 11 | * with the distribution. |
| 12 | * * Neither the name of The Linux Foundation nor the names of its |
| 13 | * contributors may be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 23 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 25 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| 26 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #define LOG_NDEBUG 0 |
| 31 | #define LOG_NDDEBUG 0 |
| 32 | #define LOG_NIDEBUG 0 |
| 33 | |
| 34 | #include <stdlib.h> |
| 35 | #include <errno.h> |
| 36 | #include <fcntl.h> |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | |
| 40 | #include <cutils/log.h> |
| 41 | #include "QcRouteController.h" |
| 42 | |
| 43 | const char *TAG = "QcRouteController"; |
| 44 | static char IP_PATH[] = "/system/bin/ip"; |
| 45 | const char *QcRouteController::MAIN_TABLE = "254"; |
| 46 | const char *QcRouteController::SOURCE_POLICY_RULE_PRIO = "150"; |
| 47 | const int MAXSIZE = 256; |
| 48 | |
| 49 | |
| 50 | QcRouteController::QcRouteController() { |
| 51 | } |
| 52 | |
| 53 | QcRouteController::~QcRouteController() { |
| 54 | } |
| 55 | |
| 56 | std::string QcRouteController::_runIpCmd(const char * cmd) { |
| 57 | FILE *fp = NULL; |
| 58 | char line[MAXSIZE]; |
| 59 | std::string res, buffer; |
| 60 | |
| 61 | if (strlen(cmd) > 255) { |
| 62 | return std::string(strerror(E2BIG)); |
| 63 | } |
| 64 | |
| 65 | buffer = IP_PATH; |
| 66 | buffer += " "; |
| 67 | buffer += cmd; |
| 68 | buffer += " 2>&1"; //capture stderr |
| 69 | |
| 70 | ALOGV(TAG,"%s", buffer.c_str()); |
| 71 | |
| 72 | if ((fp = popen(buffer.c_str(),"r")) == NULL) { |
| 73 | ALOGE(TAG, "failed to popen: %s", strerror(errno)); |
| 74 | res = (strerror(errno)); |
| 75 | } else if (fgets(line, sizeof line, fp)) { |
| 76 | ALOGV(TAG, "%s", line); |
| 77 | res = cmd; |
| 78 | res += ": "; |
| 79 | res += line; |
| 80 | } |
| 81 | pclose(fp); |
| 82 | |
| 83 | return res; |
| 84 | } |
| 85 | |
| 86 | std::string QcRouteController::repSrcRoute |
| 87 | ( |
| 88 | const char *iface, |
| 89 | const char *srcPrefix, |
| 90 | const char *gateway, |
| 91 | const char *table, |
| 92 | const char *ipver |
| 93 | ) |
| 94 | { |
| 95 | std::string res = _repDefRoute(iface, gateway, table, ipver); |
| 96 | if (res.empty()) { |
| 97 | _delRule(table, ipver); |
| 98 | res = _addRule(srcPrefix, table, ipver); |
| 99 | if (res.empty()) |
| 100 | res = _flushCache(); |
| 101 | } |
| 102 | |
| 103 | return res; |
| 104 | } |
| 105 | |
| 106 | std::string QcRouteController::delSrcRoute |
| 107 | ( |
| 108 | const char *table, |
| 109 | const char *ipver |
| 110 | ) |
| 111 | { |
| 112 | //if iface is down then route is probably purged; ignore the error. |
| 113 | _delDefRoute(table, ipver); |
| 114 | std::string res = _delRule(table, ipver); |
| 115 | if (res.empty()) |
| 116 | res = _flushCache(); |
| 117 | |
| 118 | return res; |
| 119 | } |
| 120 | |
| 121 | std::string QcRouteController::addDstRoute |
| 122 | ( |
| 123 | const char *iface, |
| 124 | const char *dstPrefix, |
| 125 | const char *gateway, |
| 126 | const int metric, |
| 127 | const char *table |
| 128 | ) |
| 129 | { |
| 130 | char buffer[255]; |
| 131 | |
| 132 | if (gateway) { |
| 133 | snprintf(buffer, sizeof buffer, |
| 134 | "route add %s via %s dev %s table %s metric %d", |
| 135 | dstPrefix, gateway, iface, table, metric); |
| 136 | } else { |
| 137 | snprintf(buffer, sizeof buffer, |
| 138 | "route add %s dev %s table %s metric %d", |
| 139 | dstPrefix, iface, table, metric); |
| 140 | } |
| 141 | |
| 142 | //blindly delete an indentical route if it exists. |
| 143 | _delHostRoute(dstPrefix, table); |
| 144 | |
| 145 | std::string res = _runIpCmd(buffer); |
| 146 | if (res.empty() || (res.find("exists") != std::string::npos)) |
| 147 | res = _flushCache(); |
| 148 | |
| 149 | return res; |
| 150 | } |
| 151 | |
| 152 | std::string QcRouteController::delDstRoute |
| 153 | ( |
| 154 | const char *dstPrefix, |
| 155 | const char *table |
| 156 | ) |
| 157 | { |
| 158 | std::string res = _delHostRoute(dstPrefix, table); |
| 159 | if (res.empty()) |
| 160 | res = _flushCache(); |
| 161 | |
| 162 | return res; |
| 163 | } |
| 164 | |
| 165 | std::string QcRouteController::_delHostRoute |
| 166 | ( |
| 167 | const char *dstPrefix, |
| 168 | const char *table |
| 169 | ) |
| 170 | { |
| 171 | char buffer[255]; |
| 172 | snprintf(buffer, sizeof buffer, "route del %s table %s", |
| 173 | dstPrefix, table); |
| 174 | |
| 175 | return _runIpCmd(buffer); |
| 176 | } |
| 177 | |
| 178 | std::string QcRouteController::replaceDefRoute |
| 179 | ( |
| 180 | const char *iface, |
| 181 | const char *gateway, |
| 182 | const char *ipver |
| 183 | ) |
| 184 | { |
| 185 | std::string res = _repDefRoute(iface, gateway, MAIN_TABLE, ipver); |
| 186 | if (res.empty()) |
| 187 | res = _flushCache(); |
| 188 | |
| 189 | return res; |
| 190 | } |
| 191 | |
| 192 | std::string QcRouteController::_repDefRoute |
| 193 | ( |
| 194 | const char *iface, |
| 195 | const char *gateway, |
| 196 | const char *table, |
| 197 | const char *ipver |
| 198 | ) |
| 199 | { |
| 200 | char buffer[255]; |
| 201 | |
| 202 | if (gateway) { |
| 203 | snprintf(buffer, sizeof buffer, |
| 204 | "%s route replace default via %s dev %s scope global table %s", |
| 205 | ipver, gateway, iface, table); |
| 206 | } else { |
| 207 | snprintf(buffer, sizeof buffer, |
| 208 | "%s route replace default dev %s table %s", |
| 209 | ipver, iface, table); |
| 210 | } |
| 211 | |
| 212 | return _runIpCmd(buffer); |
| 213 | } |
| 214 | |
| 215 | std::string QcRouteController::_delDefRoute |
| 216 | ( |
| 217 | const char *table, |
| 218 | const char *ipver, |
| 219 | const char *iface |
| 220 | ) |
| 221 | { |
| 222 | char buffer[255]; |
| 223 | |
| 224 | if (iface) { |
| 225 | snprintf(buffer, sizeof buffer, |
| 226 | "%s route del default dev %s table %s", |
| 227 | ipver, iface, table); |
| 228 | } else { |
| 229 | snprintf(buffer, sizeof buffer, |
| 230 | "%s route del default table %s", ipver, table); |
| 231 | } |
| 232 | |
| 233 | return _runIpCmd(buffer); |
| 234 | } |
| 235 | |
| 236 | std::string QcRouteController::addDefRoute |
| 237 | ( |
| 238 | const char *iface, |
| 239 | const char *gateway, |
| 240 | const char *ipver, |
| 241 | const int metric, |
| 242 | const char *table |
| 243 | ) |
| 244 | { |
| 245 | char buffer[255]; |
| 246 | |
| 247 | //remove existing def route for an iface before adding one with new metric |
| 248 | _delDefRoute(table, ipver, iface); |
| 249 | |
| 250 | if (gateway) { |
| 251 | snprintf(buffer, sizeof buffer, |
| 252 | "%s route add default via %s dev %s table %s metric %d", |
| 253 | ipver, gateway, iface, table, metric); |
| 254 | } else { |
| 255 | snprintf(buffer, sizeof buffer, |
| 256 | "%s route add default dev %s table %s metric %d", |
| 257 | ipver, iface, table, metric); |
| 258 | } |
| 259 | |
| 260 | std::string res = _runIpCmd(buffer); |
| 261 | if (res.empty()) |
| 262 | res = _flushCache(); |
| 263 | |
| 264 | return res; |
| 265 | } |
| 266 | |
| 267 | std::string QcRouteController::_flushCache() { |
| 268 | char buffer[255]; |
| 269 | |
| 270 | snprintf(buffer, sizeof buffer, "route flush cached"); |
| 271 | |
| 272 | return _runIpCmd(buffer); |
| 273 | } |
| 274 | |
| 275 | std::string QcRouteController::_addRule |
| 276 | ( |
| 277 | const char *address, |
| 278 | const char *table, |
| 279 | const char *ipver |
| 280 | ) |
| 281 | { |
| 282 | char buffer[255]; |
| 283 | |
| 284 | snprintf(buffer, sizeof buffer, |
| 285 | "%s rule add from %s lookup %s prio %s", ipver, address, table, |
| 286 | SOURCE_POLICY_RULE_PRIO); |
| 287 | |
| 288 | return _runIpCmd(buffer); |
| 289 | } |
| 290 | |
| 291 | std::string QcRouteController::_delRule |
| 292 | ( |
| 293 | const char *table, |
| 294 | const char *ipver |
| 295 | ) |
| 296 | { |
| 297 | char buffer[255]; |
| 298 | |
| 299 | snprintf(buffer, sizeof buffer, |
| 300 | "%s rule del table %s", ipver, table); |
| 301 | |
| 302 | return _runIpCmd(buffer); |
| 303 | } |