utils.c revision 0d6180f122127a9541e6193e0e6eceb5b08c608c
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 <dirent.h> 18#include <errno.h> 19#include <fcntl.h> 20#include <limits.h> 21#include <poll.h> 22#include <signal.h> 23#include <stdarg.h> 24#include <stdio.h> 25#include <stdlib.h> 26#include <string.h> 27#include <sys/inotify.h> 28#include <sys/stat.h> 29#include <sys/time.h> 30#include <sys/wait.h> 31#include <sys/klog.h> 32#include <time.h> 33#include <unistd.h> 34#include <sys/prctl.h> 35 36#include <cutils/debugger.h> 37#include <cutils/properties.h> 38#include <cutils/sockets.h> 39#include <private/android_filesystem_config.h> 40 41#include <selinux/android.h> 42 43#include "dumpstate.h" 44 45/* list of native processes to include in the native dumps */ 46static const char* native_processes_to_dump[] = { 47 "/system/bin/drmserver", 48 "/system/bin/mediaserver", 49 "/system/bin/sdcard", 50 "/system/bin/surfaceflinger", 51 NULL, 52}; 53 54void for_each_userid(void (*func)(int), const char *header) { 55 DIR *d; 56 struct dirent *de; 57 58 if (header) printf("\n------ %s ------\n", header); 59 func(0); 60 61 if (!(d = opendir("/data/system/users"))) { 62 printf("Failed to open /data/system/users (%s)\n", strerror(errno)); 63 return; 64 } 65 66 while ((de = readdir(d))) { 67 int userid; 68 if (de->d_type != DT_DIR || !(userid = atoi(de->d_name))) { 69 continue; 70 } 71 func(userid); 72 } 73 74 closedir(d); 75} 76 77static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) { 78 DIR *d; 79 struct dirent *de; 80 81 if (!(d = opendir("/proc"))) { 82 printf("Failed to open /proc (%s)\n", strerror(errno)); 83 return; 84 } 85 86 printf("\n------ %s ------\n", header); 87 while ((de = readdir(d))) { 88 int pid; 89 int fd; 90 char cmdpath[255]; 91 char cmdline[255]; 92 93 if (!(pid = atoi(de->d_name))) { 94 continue; 95 } 96 97 sprintf(cmdpath,"/proc/%d/cmdline", pid); 98 memset(cmdline, 0, sizeof(cmdline)); 99 if ((fd = open(cmdpath, O_RDONLY)) < 0) { 100 strcpy(cmdline, "N/A"); 101 } else { 102 read(fd, cmdline, sizeof(cmdline) - 1); 103 close(fd); 104 } 105 helper(pid, cmdline, arg); 106 } 107 108 closedir(d); 109} 110 111static void for_each_pid_helper(int pid, const char *cmdline, void *arg) { 112 for_each_pid_func *func = arg; 113 func(pid, cmdline); 114} 115 116void for_each_pid(for_each_pid_func func, const char *header) { 117 __for_each_pid(for_each_pid_helper, header, func); 118} 119 120static void for_each_tid_helper(int pid, const char *cmdline, void *arg) { 121 DIR *d; 122 struct dirent *de; 123 char taskpath[255]; 124 for_each_tid_func *func = arg; 125 126 sprintf(taskpath, "/proc/%d/task", pid); 127 128 if (!(d = opendir(taskpath))) { 129 printf("Failed to open %s (%s)\n", taskpath, strerror(errno)); 130 return; 131 } 132 133 func(pid, pid, cmdline); 134 135 while ((de = readdir(d))) { 136 int tid; 137 int fd; 138 char commpath[255]; 139 char comm[255]; 140 141 if (!(tid = atoi(de->d_name))) { 142 continue; 143 } 144 145 if (tid == pid) 146 continue; 147 148 sprintf(commpath,"/proc/%d/comm", tid); 149 memset(comm, 0, sizeof(comm)); 150 if ((fd = open(commpath, O_RDONLY)) < 0) { 151 strcpy(comm, "N/A"); 152 } else { 153 char *c; 154 read(fd, comm, sizeof(comm) - 1); 155 close(fd); 156 157 c = strrchr(comm, '\n'); 158 if (c) { 159 *c = '\0'; 160 } 161 } 162 func(pid, tid, comm); 163 } 164 165 closedir(d); 166} 167 168void for_each_tid(for_each_tid_func func, const char *header) { 169 __for_each_pid(for_each_tid_helper, header, func); 170} 171 172void show_wchan(int pid, int tid, const char *name) { 173 char path[255]; 174 char buffer[255]; 175 int fd; 176 char name_buffer[255]; 177 178 memset(buffer, 0, sizeof(buffer)); 179 180 sprintf(path, "/proc/%d/wchan", tid); 181 if ((fd = open(path, O_RDONLY)) < 0) { 182 printf("Failed to open '%s' (%s)\n", path, strerror(errno)); 183 return; 184 } 185 186 if (read(fd, buffer, sizeof(buffer)) < 0) { 187 printf("Failed to read '%s' (%s)\n", path, strerror(errno)); 188 goto out_close; 189 } 190 191 snprintf(name_buffer, sizeof(name_buffer), "%*s%s", 192 pid == tid ? 0 : 3, "", name); 193 194 printf("%-7d %-32s %s\n", tid, name_buffer, buffer); 195 196out_close: 197 close(fd); 198 return; 199} 200 201void do_dump_settings(int userid) { 202 char title[255]; 203 char dbpath[255]; 204 char sql[255]; 205 sprintf(title, "SYSTEM SETTINGS (user %d)", userid); 206 if (userid == 0) { 207 strcpy(dbpath, "/data/data/com.android.providers.settings/databases/settings.db"); 208 strcpy(sql, "pragma user_version; select * from system; select * from secure; select * from global;"); 209 } else { 210 sprintf(dbpath, "/data/system/users/%d/settings.db", userid); 211 strcpy(sql, "pragma user_version; select * from system; select * from secure;"); 212 } 213 run_command(title, 20, SU_PATH, "root", "sqlite3", dbpath, sql, NULL); 214 return; 215} 216 217void do_dmesg() { 218 printf("------ KERNEL LOG (dmesg) ------\n"); 219 /* Get size of kernel buffer */ 220 int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0); 221 if (size <= 0) { 222 printf("Unexpected klogctl return value: %d\n\n", size); 223 return; 224 } 225 char *buf = (char *) malloc(size + 1); 226 if (buf == NULL) { 227 printf("memory allocation failed\n\n"); 228 return; 229 } 230 int retval = klogctl(KLOG_READ_ALL, buf, size); 231 if (retval < 0) { 232 printf("klogctl failure\n\n"); 233 free(buf); 234 return; 235 } 236 buf[retval] = '\0'; 237 printf("%s\n\n", buf); 238 free(buf); 239 return; 240} 241 242void do_showmap(int pid, const char *name) { 243 char title[255]; 244 char arg[255]; 245 246 sprintf(title, "SHOW MAP %d (%s)", pid, name); 247 sprintf(arg, "%d", pid); 248 run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL); 249} 250 251/* prints the contents of a file */ 252int dump_file(const char *title, const char* path) { 253 char buffer[32768]; 254 int fd = open(path, O_RDONLY); 255 if (fd < 0) { 256 int err = errno; 257 if (title) printf("------ %s (%s) ------\n", title, path); 258 printf("*** %s: %s\n", path, strerror(err)); 259 if (title) printf("\n"); 260 return -1; 261 } 262 263 if (title) printf("------ %s (%s", title, path); 264 265 if (title) { 266 struct stat st; 267 if (memcmp(path, "/proc/", 6) && memcmp(path, "/sys/", 5) && !fstat(fd, &st)) { 268 char stamp[80]; 269 time_t mtime = st.st_mtime; 270 strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime)); 271 printf(": %s", stamp); 272 } 273 printf(") ------\n"); 274 } 275 276 int newline = 0; 277 for (;;) { 278 int ret = read(fd, buffer, sizeof(buffer)); 279 if (ret > 0) { 280 newline = (buffer[ret - 1] == '\n'); 281 ret = fwrite(buffer, ret, 1, stdout); 282 } 283 if (ret <= 0) break; 284 } 285 286 close(fd); 287 if (!newline) printf("\n"); 288 if (title) printf("\n"); 289 return 0; 290} 291 292/* forks a command and waits for it to finish */ 293int run_command(const char *title, int timeout_seconds, const char *command, ...) { 294 fflush(stdout); 295 clock_t start = clock(); 296 pid_t pid = fork(); 297 298 /* handle error case */ 299 if (pid < 0) { 300 printf("*** fork: %s\n", strerror(errno)); 301 return pid; 302 } 303 304 /* handle child case */ 305 if (pid == 0) { 306 const char *args[1024] = {command}; 307 size_t arg; 308 309 /* make sure the child dies when dumpstate dies */ 310 prctl(PR_SET_PDEATHSIG, SIGKILL); 311 312 va_list ap; 313 va_start(ap, command); 314 if (title) printf("------ %s (%s", title, command); 315 for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) { 316 args[arg] = va_arg(ap, const char *); 317 if (args[arg] == NULL) break; 318 if (title) printf(" %s", args[arg]); 319 } 320 if (title) printf(") ------\n"); 321 fflush(stdout); 322 323 execvp(command, (char**) args); 324 printf("*** exec(%s): %s\n", command, strerror(errno)); 325 fflush(stdout); 326 _exit(-1); 327 } 328 329 /* handle parent case */ 330 for (;;) { 331 int status; 332 pid_t p = waitpid(pid, &status, WNOHANG); 333 float elapsed = (float) (clock() - start) / CLOCKS_PER_SEC; 334 if (p == pid) { 335 if (WIFSIGNALED(status)) { 336 printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status)); 337 } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) { 338 printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status)); 339 } 340 if (title) printf("[%s: %.1fs elapsed]\n\n", command, elapsed); 341 return status; 342 } 343 344 if (timeout_seconds && elapsed > timeout_seconds) { 345 printf("*** %s: Timed out after %.1fs (killing pid %d)\n", command, elapsed, pid); 346 kill(pid, SIGTERM); 347 return -1; 348 } 349 350 usleep(100000); // poll every 0.1 sec 351 } 352} 353 354size_t num_props = 0; 355static char* props[2000]; 356 357static void print_prop(const char *key, const char *name, void *user) { 358 (void) user; 359 if (num_props < sizeof(props) / sizeof(props[0])) { 360 char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10]; 361 snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name); 362 props[num_props++] = strdup(buf); 363 } 364} 365 366static int compare_prop(const void *a, const void *b) { 367 return strcmp(*(char * const *) a, *(char * const *) b); 368} 369 370/* prints all the system properties */ 371void print_properties() { 372 size_t i; 373 num_props = 0; 374 property_list(print_prop, NULL); 375 qsort(&props, num_props, sizeof(props[0]), compare_prop); 376 377 printf("------ SYSTEM PROPERTIES ------\n"); 378 for (i = 0; i < num_props; ++i) { 379 fputs(props[i], stdout); 380 free(props[i]); 381 } 382 printf("\n"); 383} 384 385/* redirect output to a service control socket */ 386void redirect_to_socket(FILE *redirect, const char *service) { 387 int s = android_get_control_socket(service); 388 if (s < 0) { 389 fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno)); 390 exit(1); 391 } 392 if (listen(s, 4) < 0) { 393 fprintf(stderr, "listen(control socket): %s\n", strerror(errno)); 394 exit(1); 395 } 396 397 struct sockaddr addr; 398 socklen_t alen = sizeof(addr); 399 int fd = accept(s, &addr, &alen); 400 if (fd < 0) { 401 fprintf(stderr, "accept(control socket): %s\n", strerror(errno)); 402 exit(1); 403 } 404 405 fflush(redirect); 406 dup2(fd, fileno(redirect)); 407 close(fd); 408} 409 410/* redirect output to a file, optionally gzipping; returns gzip pid (or -1) */ 411pid_t redirect_to_file(FILE *redirect, char *path, int gzip_level) { 412 char *chp = path; 413 414 /* skip initial slash */ 415 if (chp[0] == '/') 416 chp++; 417 418 /* create leading directories, if necessary */ 419 while (chp && chp[0]) { 420 chp = strchr(chp, '/'); 421 if (chp) { 422 *chp = 0; 423 mkdir(path, 0770); /* drwxrwx--- */ 424 *chp++ = '/'; 425 } 426 } 427 428 int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 429 if (fd < 0) { 430 fprintf(stderr, "%s: %s\n", path, strerror(errno)); 431 exit(1); 432 } 433 434 pid_t gzip_pid = -1; 435 if (gzip_level > 0) { 436 int fds[2]; 437 if (pipe(fds)) { 438 fprintf(stderr, "pipe: %s\n", strerror(errno)); 439 exit(1); 440 } 441 442 fflush(redirect); 443 fflush(stdout); 444 445 gzip_pid = fork(); 446 if (gzip_pid < 0) { 447 fprintf(stderr, "fork: %s\n", strerror(errno)); 448 exit(1); 449 } 450 451 if (gzip_pid == 0) { 452 dup2(fds[0], STDIN_FILENO); 453 dup2(fd, STDOUT_FILENO); 454 455 close(fd); 456 close(fds[0]); 457 close(fds[1]); 458 459 char level[10]; 460 snprintf(level, sizeof(level), "-%d", gzip_level); 461 execlp("gzip", "gzip", level, NULL); 462 fprintf(stderr, "exec(gzip): %s\n", strerror(errno)); 463 _exit(-1); 464 } 465 466 close(fd); 467 close(fds[0]); 468 fd = fds[1]; 469 } 470 471 dup2(fd, fileno(redirect)); 472 close(fd); 473 return gzip_pid; 474} 475 476static bool should_dump_native_traces(const char* path) { 477 for (const char** p = native_processes_to_dump; *p; p++) { 478 if (!strcmp(*p, path)) { 479 return true; 480 } 481 } 482 return false; 483} 484 485/* dump Dalvik and native stack traces, return the trace file location (NULL if none) */ 486const char *dump_traces() { 487 const char* result = NULL; 488 489 char traces_path[PROPERTY_VALUE_MAX] = ""; 490 property_get("dalvik.vm.stack-trace-file", traces_path, ""); 491 if (!traces_path[0]) return NULL; 492 493 /* move the old traces.txt (if any) out of the way temporarily */ 494 char anr_traces_path[PATH_MAX]; 495 strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path)); 496 strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path)); 497 if (rename(traces_path, anr_traces_path) && errno != ENOENT) { 498 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno)); 499 return NULL; // Can't rename old traces.txt -- no permission? -- leave it alone instead 500 } 501 502 /* make the directory if necessary */ 503 char anr_traces_dir[PATH_MAX]; 504 strlcpy(anr_traces_dir, traces_path, sizeof(anr_traces_dir)); 505 char *slash = strrchr(anr_traces_dir, '/'); 506 if (slash != NULL) { 507 *slash = '\0'; 508 if (!mkdir(anr_traces_dir, 0775)) { 509 chown(anr_traces_dir, AID_SYSTEM, AID_SYSTEM); 510 chmod(anr_traces_dir, 0775); 511 if (selinux_android_restorecon(anr_traces_dir, 0) == -1) { 512 fprintf(stderr, "restorecon failed for %s: %s\n", anr_traces_dir, strerror(errno)); 513 } 514 } else if (errno != EEXIST) { 515 fprintf(stderr, "mkdir(%s): %s\n", anr_traces_dir, strerror(errno)); 516 return NULL; 517 } 518 } 519 520 /* create a new, empty traces.txt file to receive stack dumps */ 521 int fd = open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, 0666); /* -rw-rw-rw- */ 522 if (fd < 0) { 523 fprintf(stderr, "%s: %s\n", traces_path, strerror(errno)); 524 return NULL; 525 } 526 int chmod_ret = fchmod(fd, 0666); 527 if (chmod_ret < 0) { 528 fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno)); 529 close(fd); 530 return NULL; 531 } 532 533 /* walk /proc and kill -QUIT all Dalvik processes */ 534 DIR *proc = opendir("/proc"); 535 if (proc == NULL) { 536 fprintf(stderr, "/proc: %s\n", strerror(errno)); 537 goto error_close_fd; 538 } 539 540 /* use inotify to find when processes are done dumping */ 541 int ifd = inotify_init(); 542 if (ifd < 0) { 543 fprintf(stderr, "inotify_init: %s\n", strerror(errno)); 544 goto error_close_fd; 545 } 546 547 int wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE); 548 if (wfd < 0) { 549 fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno)); 550 goto error_close_ifd; 551 } 552 553 struct dirent *d; 554 int dalvik_found = 0; 555 while ((d = readdir(proc))) { 556 int pid = atoi(d->d_name); 557 if (pid <= 0) continue; 558 559 char path[PATH_MAX]; 560 char data[PATH_MAX]; 561 snprintf(path, sizeof(path), "/proc/%d/exe", pid); 562 ssize_t len = readlink(path, data, sizeof(data) - 1); 563 if (len <= 0) { 564 continue; 565 } 566 data[len] = '\0'; 567 568 if (!strncmp(data, "/system/bin/app_process", strlen("/system/bin/app_process"))) { 569 /* skip zygote -- it won't dump its stack anyway */ 570 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 571 int fd = open(path, O_RDONLY); 572 len = read(fd, data, sizeof(data) - 1); 573 close(fd); 574 if (len <= 0) { 575 continue; 576 } 577 data[len] = '\0'; 578 if (!strncmp(data, "zygote", strlen("zygote"))) { 579 continue; 580 } 581 582 ++dalvik_found; 583 if (kill(pid, SIGQUIT)) { 584 fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno)); 585 continue; 586 } 587 588 /* wait for the writable-close notification from inotify */ 589 struct pollfd pfd = { ifd, POLLIN, 0 }; 590 int ret = poll(&pfd, 1, 5000); /* 5 sec timeout */ 591 if (ret < 0) { 592 fprintf(stderr, "poll: %s\n", strerror(errno)); 593 } else if (ret == 0) { 594 fprintf(stderr, "warning: timed out dumping pid %d\n", pid); 595 } else { 596 struct inotify_event ie; 597 read(ifd, &ie, sizeof(ie)); 598 } 599 } else if (should_dump_native_traces(data)) { 600 /* dump native process if appropriate */ 601 if (lseek(fd, 0, SEEK_END) < 0) { 602 fprintf(stderr, "lseek: %s\n", strerror(errno)); 603 } else { 604 dump_backtrace_to_file(pid, fd); 605 } 606 } 607 } 608 609 if (dalvik_found == 0) { 610 fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n"); 611 } 612 613 static char dump_traces_path[PATH_MAX]; 614 strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path)); 615 strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path)); 616 if (rename(traces_path, dump_traces_path)) { 617 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno)); 618 goto error_close_ifd; 619 } 620 result = dump_traces_path; 621 622 /* replace the saved [ANR] traces.txt file */ 623 rename(anr_traces_path, traces_path); 624 625error_close_ifd: 626 close(ifd); 627error_close_fd: 628 close(fd); 629 return result; 630} 631 632void play_sound(const char* path) { 633 run_command(NULL, 5, "/system/bin/stagefright", "-o", "-a", path, NULL); 634} 635 636void dump_route_tables() { 637 const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 638 dump_file("RT_TABLES", RT_TABLES_PATH); 639 FILE* fp = fopen(RT_TABLES_PATH, "r"); 640 if (!fp) { 641 printf("*** %s: %s\n", RT_TABLES_PATH, strerror(errno)); 642 return; 643 } 644 char table[16]; 645 // Each line has an integer (the table number), a space, and a string (the table name). We only 646 // need the table number. It's a 32-bit unsigned number, so max 10 chars. Skip the table name. 647 // Add a fixed max limit so this doesn't go awry. 648 for (int i = 0; i < 64 && fscanf(fp, " %10s %*s", table) == 1; ++i) { 649 run_command("ROUTE TABLE IPv4", 10, "ip", "-4", "route", "show", "table", table, NULL); 650 run_command("ROUTE TABLE IPv6", 10, "ip", "-6", "route", "show", "table", table, NULL); 651 } 652 fclose(fp); 653} 654