Tom Cherry | bac3299 | 2015-07-31 12:45:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 "service.h" |
| 18 | |
| 19 | #include <fcntl.h> |
| 20 | #include <sys/stat.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <termios.h> |
| 23 | |
| 24 | #include <selinux/selinux.h> |
| 25 | |
| 26 | #include <base/file.h> |
| 27 | #include <base/stringprintf.h> |
| 28 | #include <cutils/android_reboot.h> |
| 29 | #include <cutils/sockets.h> |
| 30 | |
| 31 | #include "action.h" |
| 32 | #include "init.h" |
| 33 | #include "init_parser.h" |
| 34 | #include "keywords.h" |
| 35 | #include "log.h" |
| 36 | #include "property_service.h" |
| 37 | #include "util.h" |
| 38 | |
| 39 | #define CRITICAL_CRASH_THRESHOLD 4 // if we crash >4 times ... |
| 40 | #define CRITICAL_CRASH_WINDOW (4*60) // ... in 4 minutes, goto recovery |
| 41 | |
| 42 | SocketInfo::SocketInfo() : uid(0), gid(0), perm(0) { |
| 43 | } |
| 44 | |
| 45 | SocketInfo::SocketInfo(const std::string& name, const std::string& type, uid_t uid, |
| 46 | gid_t gid, int perm, const std::string& socketcon) |
| 47 | : name(name), type(type), uid(uid), gid(gid), perm(perm), socketcon(socketcon) { |
| 48 | } |
| 49 | |
| 50 | ServiceEnvironmentInfo::ServiceEnvironmentInfo() { |
| 51 | } |
| 52 | |
| 53 | ServiceEnvironmentInfo::ServiceEnvironmentInfo(const std::string& name, |
| 54 | const std::string& value) |
| 55 | : name(name), value(value) { |
| 56 | } |
| 57 | |
| 58 | Service::Service(const std::string& name, const std::string& classname, |
| 59 | const std::vector<std::string>& args) |
| 60 | : name_(name), classname_(classname), flags_(0), pid_(0), time_started_(0), |
| 61 | time_crashed_(0), nr_crashed_(0), uid_(0), gid_(0), seclabel_(""), |
| 62 | ioprio_class_(IoSchedClass_NONE), ioprio_pri_(0), args_(args) { |
| 63 | onrestart_.InitSingleTrigger("onrestart"); |
| 64 | } |
| 65 | |
| 66 | Service::Service(const std::string& name, const std::string& classname, |
| 67 | unsigned flags, uid_t uid, gid_t gid, const std::vector<gid_t>& supp_gids, |
| 68 | const std::string& seclabel, const std::vector<std::string>& args) |
| 69 | : name_(name), classname_(classname), flags_(flags), pid_(0), time_started_(0), |
| 70 | time_crashed_(0), nr_crashed_(0), uid_(uid), gid_(gid), supp_gids_(supp_gids), |
| 71 | seclabel_(seclabel), ioprio_class_(IoSchedClass_NONE), ioprio_pri_(0), args_(args) { |
| 72 | onrestart_.InitSingleTrigger("onrestart"); |
| 73 | } |
| 74 | |
| 75 | void Service::NotifyStateChange(const std::string& new_state) const { |
| 76 | if (!properties_initialized()) { |
| 77 | // If properties aren't available yet, we can't set them. |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | if ((flags_ & SVC_EXEC) != 0) { |
| 82 | // 'exec' commands don't have properties tracking their state. |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | std::string prop_name = android::base::StringPrintf("init.svc.%s", name_.c_str()); |
| 87 | if (prop_name.length() >= PROP_NAME_MAX) { |
| 88 | // If the property name would be too long, we can't set it. |
| 89 | ERROR("Property name \"init.svc.%s\" too long; not setting to %s\n", |
| 90 | name_.c_str(), new_state.c_str()); |
| 91 | return; |
| 92 | } |
| 93 | |
| 94 | property_set(prop_name.c_str(), new_state.c_str()); |
| 95 | } |
| 96 | |
| 97 | bool Service::Reap() { |
| 98 | if (!(flags_ & SVC_ONESHOT) || (flags_ & SVC_RESTART)) { |
| 99 | NOTICE("Service '%s' (pid %d) killing any children in process group\n", |
| 100 | name_.c_str(), pid_); |
| 101 | kill(-pid_, SIGKILL); |
| 102 | } |
| 103 | |
| 104 | // Remove any sockets we may have created. |
| 105 | for (const auto& si : sockets_) { |
| 106 | std::string tmp = android::base::StringPrintf(ANDROID_SOCKET_DIR "/%s", |
| 107 | si.name.c_str()); |
| 108 | unlink(tmp.c_str()); |
| 109 | } |
| 110 | |
| 111 | if (flags_ & SVC_EXEC) { |
| 112 | INFO("SVC_EXEC pid %d finished...\n", pid_); |
| 113 | return true; |
| 114 | } |
| 115 | |
| 116 | pid_ = 0; |
| 117 | flags_ &= (~SVC_RUNNING); |
| 118 | |
| 119 | // Oneshot processes go into the disabled state on exit, |
| 120 | // except when manually restarted. |
| 121 | if ((flags_ & SVC_ONESHOT) && !(flags_ & SVC_RESTART)) { |
| 122 | flags_ |= SVC_DISABLED; |
| 123 | } |
| 124 | |
| 125 | // Disabled and reset processes do not get restarted automatically. |
| 126 | if (flags_ & (SVC_DISABLED | SVC_RESET)) { |
| 127 | NotifyStateChange("stopped"); |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | time_t now = gettime(); |
| 132 | if ((flags_ & SVC_CRITICAL) && !(flags_ & SVC_RESTART)) { |
| 133 | if (time_crashed_ + CRITICAL_CRASH_WINDOW >= now) { |
| 134 | if (++nr_crashed_ > CRITICAL_CRASH_THRESHOLD) { |
| 135 | ERROR("critical process '%s' exited %d times in %d minutes; " |
| 136 | "rebooting into recovery mode\n", name_.c_str(), |
| 137 | CRITICAL_CRASH_THRESHOLD, CRITICAL_CRASH_WINDOW / 60); |
| 138 | android_reboot(ANDROID_RB_RESTART2, 0, "recovery"); |
| 139 | return false; |
| 140 | } |
| 141 | } else { |
| 142 | time_crashed_ = now; |
| 143 | nr_crashed_ = 1; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | flags_ &= (~SVC_RESTART); |
| 148 | flags_ |= SVC_RESTARTING; |
| 149 | |
| 150 | // Execute all onrestart commands for this service. |
| 151 | onrestart_.ExecuteAllCommands(); |
| 152 | |
| 153 | NotifyStateChange("restarting"); |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | void Service::DumpState() const { |
| 158 | INFO("service %s\n", name_.c_str()); |
| 159 | INFO(" class '%s'\n", classname_.c_str()); |
| 160 | INFO(" exec"); |
| 161 | for (const auto& s : args_) { |
| 162 | INFO(" '%s'", s.c_str()); |
| 163 | } |
| 164 | INFO("\n"); |
| 165 | for (const auto& si : sockets_) { |
| 166 | INFO(" socket %s %s 0%o\n", si.name.c_str(), si.type.c_str(), si.perm); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | bool Service::HandleLine(int kw, const std::vector<std::string>& args, std::string* err) { |
| 171 | std::vector<std::string> str_args; |
| 172 | |
| 173 | ioprio_class_ = IoSchedClass_NONE; |
| 174 | |
| 175 | switch (kw) { |
| 176 | case K_class: |
| 177 | if (args.size() != 2) { |
| 178 | *err = "class option requires a classname\n"; |
| 179 | return false; |
| 180 | } else { |
| 181 | classname_ = args[1]; |
| 182 | } |
| 183 | break; |
| 184 | case K_console: |
| 185 | flags_ |= SVC_CONSOLE; |
| 186 | break; |
| 187 | case K_disabled: |
| 188 | flags_ |= SVC_DISABLED; |
| 189 | flags_ |= SVC_RC_DISABLED; |
| 190 | break; |
| 191 | case K_ioprio: |
| 192 | if (args.size() != 3) { |
| 193 | *err = "ioprio optin usage: ioprio <rt|be|idle> <ioprio 0-7>\n"; |
| 194 | return false; |
| 195 | } else { |
| 196 | ioprio_pri_ = std::stoul(args[2], 0, 8); |
| 197 | |
| 198 | if (ioprio_pri_ < 0 || ioprio_pri_ > 7) { |
| 199 | *err = "priority value must be range 0 - 7\n"; |
| 200 | return false; |
| 201 | } |
| 202 | |
| 203 | if (args[1] == "rt") { |
| 204 | ioprio_class_ = IoSchedClass_RT; |
| 205 | } else if (args[1] == "be") { |
| 206 | ioprio_class_ = IoSchedClass_BE; |
| 207 | } else if (args[1] == "idle") { |
| 208 | ioprio_class_ = IoSchedClass_IDLE; |
| 209 | } else { |
| 210 | *err = "ioprio option usage: ioprio <rt|be|idle> <0-7>\n"; |
| 211 | return false; |
| 212 | } |
| 213 | } |
| 214 | break; |
| 215 | case K_group: |
| 216 | if (args.size() < 2) { |
| 217 | *err = "group option requires a group id\n"; |
| 218 | return false; |
| 219 | } else if (args.size() > NR_SVC_SUPP_GIDS + 2) { |
| 220 | *err = android::base::StringPrintf("group option accepts at most %d supp. groups\n", |
| 221 | NR_SVC_SUPP_GIDS); |
| 222 | return false; |
| 223 | } else { |
| 224 | gid_ = decode_uid(args[1].c_str()); |
| 225 | for (std::size_t n = 2; n < args.size(); n++) { |
| 226 | supp_gids_.push_back(decode_uid(args[n].c_str())); |
| 227 | } |
| 228 | } |
| 229 | break; |
| 230 | case K_keycodes: |
| 231 | if (args.size() < 2) { |
| 232 | *err = "keycodes option requires atleast one keycode\n"; |
| 233 | return false; |
| 234 | } else { |
| 235 | for (std::size_t i = 1; i < args.size(); i++) { |
| 236 | keycodes_.push_back(std::stoi(args[i])); |
| 237 | } |
| 238 | } |
| 239 | break; |
| 240 | case K_oneshot: |
| 241 | flags_ |= SVC_ONESHOT; |
| 242 | break; |
| 243 | case K_onrestart: |
| 244 | if (args.size() < 2) { |
| 245 | return false; |
| 246 | } |
| 247 | str_args.assign(args.begin() + 1, args.end()); |
| 248 | add_command_to_action(&onrestart_, str_args, "", 0, err); |
| 249 | break; |
| 250 | case K_critical: |
| 251 | flags_ |= SVC_CRITICAL; |
| 252 | break; |
| 253 | case K_setenv: { /* name value */ |
| 254 | if (args.size() < 3) { |
| 255 | *err = "setenv option requires name and value arguments\n"; |
| 256 | return false; |
| 257 | } |
| 258 | |
| 259 | envvars_.push_back({args[1], args[2]}); |
| 260 | break; |
| 261 | } |
| 262 | case K_socket: {/* name type perm [ uid gid context ] */ |
| 263 | if (args.size() < 4) { |
| 264 | *err = "socket option requires name, type, perm arguments\n"; |
| 265 | return false; |
| 266 | } |
| 267 | if (args[2] != "dgram" && args[2] != "stream" && |
| 268 | args[2] != "seqpacket") { |
| 269 | *err = "socket type must be 'dgram', 'stream' or 'seqpacket'\n"; |
| 270 | return false; |
| 271 | } |
| 272 | |
| 273 | int perm = std::stoul(args[3], 0, 8); |
| 274 | uid_t uid = args.size() > 4 ? decode_uid(args[4].c_str()) : 0; |
| 275 | gid_t gid = args.size() > 5 ? decode_uid(args[5].c_str()) : 0; |
| 276 | std::string socketcon = args.size() > 6 ? args[6] : ""; |
| 277 | |
| 278 | sockets_.push_back({args[1], args[2], uid, gid, perm, socketcon}); |
| 279 | break; |
| 280 | } |
| 281 | case K_user: |
| 282 | if (args.size() != 2) { |
| 283 | *err = "user option requires a user id\n"; |
| 284 | return false; |
| 285 | } else { |
| 286 | uid_ = decode_uid(args[1].c_str()); |
| 287 | } |
| 288 | break; |
| 289 | case K_seclabel: |
| 290 | if (args.size() != 2) { |
| 291 | *err = "seclabel option requires a label string\n"; |
| 292 | return false; |
| 293 | } else { |
| 294 | seclabel_ = args[1]; |
| 295 | } |
| 296 | break; |
| 297 | case K_writepid: |
| 298 | if (args.size() < 2) { |
| 299 | *err = "writepid option requires at least one filename\n"; |
| 300 | return false; |
| 301 | } |
| 302 | writepid_files_.assign(args.begin() + 1, args.end()); |
| 303 | break; |
| 304 | |
| 305 | default: |
| 306 | *err = android::base::StringPrintf("invalid option '%s'\n", args[0].c_str()); |
| 307 | return false; |
| 308 | } |
| 309 | return true; |
| 310 | } |
| 311 | |
| 312 | bool Service::Start(const std::vector<std::string>& dynamic_args) { |
| 313 | // Starting a service removes it from the disabled or reset state and |
| 314 | // immediately takes it out of the restarting state if it was in there. |
| 315 | flags_ &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET|SVC_RESTART|SVC_DISABLED_START)); |
| 316 | time_started_ = 0; |
| 317 | |
| 318 | // Running processes require no additional work --- if they're in the |
| 319 | // process of exiting, we've ensured that they will immediately restart |
| 320 | // on exit, unless they are ONESHOT. |
| 321 | if (flags_ & SVC_RUNNING) { |
| 322 | return false; |
| 323 | } |
| 324 | |
| 325 | bool needs_console = (flags_ & SVC_CONSOLE); |
| 326 | if (needs_console && !have_console) { |
| 327 | ERROR("service '%s' requires console\n", name_.c_str()); |
| 328 | flags_ |= SVC_DISABLED; |
| 329 | return false; |
| 330 | } |
| 331 | |
| 332 | struct stat sb; |
| 333 | if (stat(args_[0].c_str(), &sb) == -1) { |
| 334 | ERROR("cannot find '%s' (%s), disabling '%s'\n", |
| 335 | args_[0].c_str(), strerror(errno), name_.c_str()); |
| 336 | flags_ |= SVC_DISABLED; |
| 337 | return false; |
| 338 | } |
| 339 | |
| 340 | if ((!(flags_ & SVC_ONESHOT)) && !dynamic_args.empty()) { |
| 341 | ERROR("service '%s' must be one-shot to use dynamic args, disabling\n", |
| 342 | args_[0].c_str()); |
| 343 | flags_ |= SVC_DISABLED; |
| 344 | return false; |
| 345 | } |
| 346 | |
| 347 | std::string scon; |
| 348 | if (!seclabel_.empty()) { |
| 349 | scon = seclabel_; |
| 350 | } else { |
| 351 | char* mycon = nullptr; |
| 352 | char* fcon = nullptr; |
| 353 | |
| 354 | INFO("computing context for service '%s'\n", args_[0].c_str()); |
| 355 | int rc = getcon(&mycon); |
| 356 | if (rc < 0) { |
| 357 | ERROR("could not get context while starting '%s'\n", name_.c_str()); |
| 358 | return false; |
| 359 | } |
| 360 | |
| 361 | rc = getfilecon(args_[0].c_str(), &fcon); |
| 362 | if (rc < 0) { |
| 363 | ERROR("could not get context while starting '%s'\n", name_.c_str()); |
| 364 | free(mycon); |
| 365 | return false; |
| 366 | } |
| 367 | |
| 368 | char* ret_scon = nullptr; |
| 369 | rc = security_compute_create(mycon, fcon, string_to_security_class("process"), |
| 370 | &ret_scon); |
| 371 | if (rc == 0) { |
| 372 | scon = ret_scon; |
| 373 | free(ret_scon); |
| 374 | } |
| 375 | if (rc == 0 && scon == mycon) { |
| 376 | ERROR("Service %s does not have a SELinux domain defined.\n", name_.c_str()); |
| 377 | free(mycon); |
| 378 | free(fcon); |
| 379 | return false; |
| 380 | } |
| 381 | free(mycon); |
| 382 | free(fcon); |
| 383 | if (rc < 0) { |
| 384 | ERROR("could not get context while starting '%s'\n", name_.c_str()); |
| 385 | return false; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | NOTICE("Starting service '%s'...\n", name_.c_str()); |
| 390 | |
| 391 | pid_t pid = fork(); |
| 392 | if (pid == 0) { |
| 393 | int fd, sz; |
| 394 | |
| 395 | umask(077); |
| 396 | if (properties_initialized()) { |
| 397 | get_property_workspace(&fd, &sz); |
| 398 | std::string tmp = android::base::StringPrintf("%d,%d", dup(fd), sz); |
| 399 | add_environment("ANDROID_PROPERTY_WORKSPACE", tmp.c_str()); |
| 400 | } |
| 401 | |
| 402 | for (const auto& ei : envvars_) { |
| 403 | add_environment(ei.name.c_str(), ei.value.c_str()); |
| 404 | } |
| 405 | |
| 406 | for (const auto& si : sockets_) { |
| 407 | int socket_type = ((si.type == "stream" ? SOCK_STREAM : |
| 408 | (si.type == "dgram" ? SOCK_DGRAM : |
| 409 | SOCK_SEQPACKET))); |
| 410 | const char* socketcon = |
| 411 | !si.socketcon.empty() ? si.socketcon.c_str() : scon.c_str(); |
| 412 | |
| 413 | int s = create_socket(si.name.c_str(), socket_type, si.perm, |
| 414 | si.uid, si.gid, socketcon); |
| 415 | if (s >= 0) { |
| 416 | PublishSocket(si.name, s); |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | std::string pid_str = android::base::StringPrintf("%d", pid); |
| 421 | for (const auto& file : writepid_files_) { |
| 422 | if (!android::base::WriteStringToFile(pid_str, file)) { |
| 423 | ERROR("couldn't write %s to %s: %s\n", |
| 424 | pid_str.c_str(), file.c_str(), strerror(errno)); |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | if (ioprio_class_ != IoSchedClass_NONE) { |
| 429 | if (android_set_ioprio(getpid(), ioprio_class_, ioprio_pri_)) { |
| 430 | ERROR("Failed to set pid %d ioprio = %d,%d: %s\n", |
| 431 | getpid(), ioprio_class_, ioprio_pri_, strerror(errno)); |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | if (needs_console) { |
| 436 | setsid(); |
| 437 | OpenConsole(); |
| 438 | } else { |
| 439 | ZapStdio(); |
| 440 | } |
| 441 | |
| 442 | setpgid(0, getpid()); |
| 443 | |
| 444 | // As requested, set our gid, supplemental gids, and uid. |
| 445 | if (gid_) { |
| 446 | if (setgid(gid_) != 0) { |
| 447 | ERROR("setgid failed: %s\n", strerror(errno)); |
| 448 | _exit(127); |
| 449 | } |
| 450 | } |
| 451 | if (!supp_gids_.empty()) { |
| 452 | if (setgroups(supp_gids_.size(), &supp_gids_[0]) != 0) { |
| 453 | ERROR("setgroups failed: %s\n", strerror(errno)); |
| 454 | _exit(127); |
| 455 | } |
| 456 | } |
| 457 | if (uid_) { |
| 458 | if (setuid(uid_) != 0) { |
| 459 | ERROR("setuid failed: %s\n", strerror(errno)); |
| 460 | _exit(127); |
| 461 | } |
| 462 | } |
| 463 | if (!seclabel_.empty()) { |
| 464 | if (setexeccon(seclabel_.c_str()) < 0) { |
| 465 | ERROR("cannot setexeccon('%s'): %s\n", |
| 466 | seclabel_.c_str(), strerror(errno)); |
| 467 | _exit(127); |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | std::vector<char*> strs; |
| 472 | for (const auto& s : args_) { |
| 473 | strs.push_back(const_cast<char*>(s.c_str())); |
| 474 | } |
| 475 | for (const auto& s : dynamic_args) { |
| 476 | strs.push_back(const_cast<char*>(s.c_str())); |
| 477 | } |
| 478 | strs.push_back(nullptr); |
| 479 | if (execve(args_[0].c_str(), (char**) &strs[0], (char**) ENV) < 0) { |
| 480 | ERROR("cannot execve('%s'): %s\n", args_[0].c_str(), strerror(errno)); |
| 481 | } |
| 482 | |
| 483 | _exit(127); |
| 484 | } |
| 485 | |
| 486 | if (pid < 0) { |
| 487 | ERROR("failed to start '%s'\n", name_.c_str()); |
| 488 | pid_ = 0; |
| 489 | return false; |
| 490 | } |
| 491 | |
| 492 | time_started_ = gettime(); |
| 493 | pid_ = pid; |
| 494 | flags_ |= SVC_RUNNING; |
| 495 | |
| 496 | if ((flags_ & SVC_EXEC) != 0) { |
| 497 | INFO("SVC_EXEC pid %d (uid %d gid %d+%zu context %s) started; waiting...\n", |
| 498 | pid_, uid_, gid_, supp_gids_.size(), |
| 499 | !seclabel_.empty() ? seclabel_.c_str() : "default"); |
| 500 | } |
| 501 | |
| 502 | NotifyStateChange("running"); |
| 503 | return true; |
| 504 | } |
| 505 | |
| 506 | bool Service::Start() { |
| 507 | const std::vector<std::string> null_dynamic_args; |
| 508 | return Start(null_dynamic_args); |
| 509 | } |
| 510 | |
| 511 | bool Service::StartIfNotDisabled() { |
| 512 | if (!(flags_ & SVC_DISABLED)) { |
| 513 | return Start(); |
| 514 | } else { |
| 515 | flags_ |= SVC_DISABLED_START; |
| 516 | } |
| 517 | return true; |
| 518 | } |
| 519 | |
| 520 | bool Service::Enable() { |
| 521 | flags_ &= ~(SVC_DISABLED | SVC_RC_DISABLED); |
| 522 | if (flags_ & SVC_DISABLED_START) { |
| 523 | return Start(); |
| 524 | } |
| 525 | return true; |
| 526 | } |
| 527 | |
| 528 | void Service::Reset() { |
| 529 | StopOrReset(SVC_RESET); |
| 530 | } |
| 531 | |
| 532 | void Service::Stop() { |
| 533 | StopOrReset(SVC_DISABLED); |
| 534 | } |
| 535 | |
| 536 | void Service::Restart() { |
| 537 | if (flags_ & SVC_RUNNING) { |
| 538 | /* Stop, wait, then start the service. */ |
| 539 | StopOrReset(SVC_RESTART); |
| 540 | } else if (!(flags_ & SVC_RESTARTING)) { |
| 541 | /* Just start the service since it's not running. */ |
| 542 | Start(); |
| 543 | } /* else: Service is restarting anyways. */ |
| 544 | } |
| 545 | |
| 546 | void Service::RestartIfNeeded(time_t& process_needs_restart) { |
| 547 | time_t next_start_time = time_started_ + 5; |
| 548 | |
| 549 | if (next_start_time <= gettime()) { |
| 550 | flags_ &= (~SVC_RESTARTING); |
| 551 | Start(); |
| 552 | return; |
| 553 | } |
| 554 | |
| 555 | if ((next_start_time < process_needs_restart) || |
| 556 | (process_needs_restart == 0)) { |
| 557 | process_needs_restart = next_start_time; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | /* The how field should be either SVC_DISABLED, SVC_RESET, or SVC_RESTART */ |
| 562 | void Service::StopOrReset(int how) { |
| 563 | /* The service is still SVC_RUNNING until its process exits, but if it has |
| 564 | * already exited it shoudn't attempt a restart yet. */ |
| 565 | flags_ &= ~(SVC_RESTARTING | SVC_DISABLED_START); |
| 566 | |
| 567 | if ((how != SVC_DISABLED) && (how != SVC_RESET) && (how != SVC_RESTART)) { |
| 568 | /* Hrm, an illegal flag. Default to SVC_DISABLED */ |
| 569 | how = SVC_DISABLED; |
| 570 | } |
| 571 | /* if the service has not yet started, prevent |
| 572 | * it from auto-starting with its class |
| 573 | */ |
| 574 | if (how == SVC_RESET) { |
| 575 | flags_ |= (flags_ & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET; |
| 576 | } else { |
| 577 | flags_ |= how; |
| 578 | } |
| 579 | |
| 580 | if (pid_) { |
| 581 | NOTICE("Service '%s' is being killed...\n", name_.c_str()); |
| 582 | kill(-pid_, SIGKILL); |
| 583 | NotifyStateChange("stopping"); |
| 584 | } else { |
| 585 | NotifyStateChange("stopped"); |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | void Service::ZapStdio() const { |
| 590 | int fd; |
| 591 | fd = open("/dev/null", O_RDWR); |
| 592 | dup2(fd, 0); |
| 593 | dup2(fd, 1); |
| 594 | dup2(fd, 2); |
| 595 | close(fd); |
| 596 | } |
| 597 | |
| 598 | void Service::OpenConsole() const { |
| 599 | int fd; |
| 600 | if ((fd = open(console_name.c_str(), O_RDWR)) < 0) { |
| 601 | fd = open("/dev/null", O_RDWR); |
| 602 | } |
| 603 | ioctl(fd, TIOCSCTTY, 0); |
| 604 | dup2(fd, 0); |
| 605 | dup2(fd, 1); |
| 606 | dup2(fd, 2); |
| 607 | close(fd); |
| 608 | } |
| 609 | |
| 610 | void Service::PublishSocket(const std::string& name, int fd) const { |
| 611 | std::string key = android::base::StringPrintf(ANDROID_SOCKET_ENV_PREFIX "%s", |
| 612 | name.c_str()); |
| 613 | std::string val = android::base::StringPrintf("%d", fd); |
| 614 | add_environment(key.c_str(), val.c_str()); |
| 615 | |
| 616 | /* make sure we don't close-on-exec */ |
| 617 | fcntl(fd, F_SETFD, 0); |
| 618 | } |
| 619 | |
| 620 | int ServiceManager::exec_count_ = 0; |
| 621 | |
| 622 | ServiceManager::ServiceManager() { |
| 623 | } |
| 624 | |
| 625 | ServiceManager& ServiceManager::GetInstance() { |
| 626 | static ServiceManager instance; |
| 627 | return instance; |
| 628 | } |
| 629 | |
| 630 | Service* ServiceManager::AddNewService(const std::string& name, |
| 631 | const std::string& classname, |
| 632 | const std::vector<std::string>& args, |
| 633 | std::string* err) { |
| 634 | if (!IsValidName(name)) { |
| 635 | *err = android::base::StringPrintf("invalid service name '%s'\n", name.c_str()); |
| 636 | return nullptr; |
| 637 | } |
| 638 | |
| 639 | Service* svc = ServiceManager::GetInstance().FindServiceByName(name); |
| 640 | if (svc) { |
| 641 | *err = android::base::StringPrintf("ignored duplicate definition of service '%s'\n", |
| 642 | name.c_str()); |
| 643 | return nullptr; |
| 644 | } |
| 645 | |
| 646 | std::unique_ptr<Service> svc_p(new Service(name, classname, args)); |
| 647 | if (!svc_p) { |
| 648 | ERROR("Couldn't allocate service for service '%s'", name.c_str()); |
| 649 | return nullptr; |
| 650 | } |
| 651 | svc = svc_p.get(); |
| 652 | services_.push_back(std::move(svc_p)); |
| 653 | |
| 654 | return svc; |
| 655 | } |
| 656 | |
| 657 | Service* ServiceManager::MakeExecOneshotService(const std::vector<std::string>& args) { |
| 658 | // Parse the arguments: exec [SECLABEL [UID [GID]*] --] COMMAND ARGS... |
| 659 | // SECLABEL can be a - to denote default |
| 660 | std::size_t command_arg = 1; |
| 661 | for (std::size_t i = 1; i < args.size(); ++i) { |
| 662 | if (args[i] == "--") { |
| 663 | command_arg = i + 1; |
| 664 | break; |
| 665 | } |
| 666 | } |
| 667 | if (command_arg > 4 + NR_SVC_SUPP_GIDS) { |
| 668 | ERROR("exec called with too many supplementary group ids\n"); |
| 669 | return nullptr; |
| 670 | } |
| 671 | |
| 672 | if (command_arg >= args.size()) { |
| 673 | ERROR("exec called without command\n"); |
| 674 | return nullptr; |
| 675 | } |
| 676 | std::vector<std::string> str_args(args.begin() + command_arg, args.end()); |
| 677 | |
| 678 | exec_count_++; |
| 679 | std::string name = android::base::StringPrintf("exec %d (%s)", exec_count_, |
| 680 | str_args[0].c_str()); |
| 681 | unsigned flags = SVC_EXEC | SVC_ONESHOT; |
| 682 | |
| 683 | std::string seclabel = ""; |
| 684 | if (command_arg > 2 && args[1] != "-") { |
| 685 | seclabel = args[1]; |
| 686 | } |
| 687 | uid_t uid = 0; |
| 688 | if (command_arg > 3) { |
| 689 | uid = decode_uid(args[2].c_str()); |
| 690 | } |
| 691 | gid_t gid = 0; |
| 692 | std::vector<gid_t> supp_gids; |
| 693 | if (command_arg > 4) { |
| 694 | gid = decode_uid(args[3].c_str()); |
| 695 | std::size_t nr_supp_gids = command_arg - 1 /* -- */ - 4 /* exec SECLABEL UID GID */; |
| 696 | for (size_t i = 0; i < nr_supp_gids; ++i) { |
| 697 | supp_gids.push_back(decode_uid(args[4 + i].c_str())); |
| 698 | } |
| 699 | } |
| 700 | |
| 701 | std::unique_ptr<Service> svc_p(new Service(name, "default", flags, uid, gid, |
| 702 | supp_gids, seclabel, str_args)); |
| 703 | if (!svc_p) { |
| 704 | ERROR("Couldn't allocate service for exec of '%s'", |
| 705 | str_args[0].c_str()); |
| 706 | return nullptr; |
| 707 | } |
| 708 | Service* svc = svc_p.get(); |
| 709 | services_.push_back(std::move(svc_p)); |
| 710 | |
| 711 | return svc; |
| 712 | } |
| 713 | |
| 714 | Service* ServiceManager::FindServiceByName(const std::string& name) const { |
| 715 | auto svc = std::find_if(services_.begin(), services_.end(), |
| 716 | [&name] (const std::unique_ptr<Service>& s) { |
| 717 | return name == s->name(); |
| 718 | }); |
| 719 | if (svc != services_.end()) { |
| 720 | return svc->get(); |
| 721 | } |
| 722 | return nullptr; |
| 723 | } |
| 724 | |
| 725 | Service* ServiceManager::FindServiceByPid(pid_t pid) const { |
| 726 | auto svc = std::find_if(services_.begin(), services_.end(), |
| 727 | [&pid] (const std::unique_ptr<Service>& s) { |
| 728 | return s->pid() == pid; |
| 729 | }); |
| 730 | if (svc != services_.end()) { |
| 731 | return svc->get(); |
| 732 | } |
| 733 | return nullptr; |
| 734 | } |
| 735 | |
| 736 | Service* ServiceManager::FindServiceByKeychord(int keychord_id) const { |
| 737 | auto svc = std::find_if(services_.begin(), services_.end(), |
| 738 | [&keychord_id] (const std::unique_ptr<Service>& s) { |
| 739 | return s->keychord_id() == keychord_id; |
| 740 | }); |
| 741 | |
| 742 | if (svc != services_.end()) { |
| 743 | return svc->get(); |
| 744 | } |
| 745 | return nullptr; |
| 746 | } |
| 747 | |
| 748 | void ServiceManager::ForEachService(void (*func)(Service* svc)) const { |
| 749 | for (const auto& s : services_) { |
| 750 | func(s.get()); |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | void ServiceManager::ForEachServiceInClass(const std::string& classname, |
| 755 | void (*func)(Service* svc)) const { |
| 756 | for (const auto& s : services_) { |
| 757 | if (classname == s->classname()) { |
| 758 | func(s.get()); |
| 759 | } |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | void ServiceManager::ForEachServiceWithFlags(unsigned matchflags, |
| 764 | void (*func)(Service* svc)) const { |
| 765 | for (const auto& s : services_) { |
| 766 | if (s->flags() & matchflags) { |
| 767 | func(s.get()); |
| 768 | } |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | void ServiceManager::RemoveService(const Service& svc) |
| 773 | { |
| 774 | auto svc_it = std::find_if(services_.begin(), services_.end(), |
| 775 | [&svc] (const std::unique_ptr<Service>& s) { |
| 776 | return svc.name() == s->name(); |
| 777 | }); |
| 778 | if (svc_it == services_.end()) { |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | services_.erase(svc_it); |
| 783 | } |
| 784 | |
| 785 | bool ServiceManager::IsValidName(const std::string& name) const |
| 786 | { |
| 787 | if (name.size() > 16) { |
| 788 | return false; |
| 789 | } |
| 790 | for (const auto& c : name) { |
| 791 | if (!isalnum(c) && (c != '_') && (c != '-')) { |
| 792 | return false; |
| 793 | } |
| 794 | } |
| 795 | return true; |
| 796 | } |
| 797 | |
| 798 | void ServiceManager::DumpState() const |
| 799 | { |
| 800 | for (const auto& s : services_) { |
| 801 | s->DumpState(); |
| 802 | } |
| 803 | INFO("\n"); |
| 804 | } |