Annotation of embedaddon/strongswan/src/libstrongswan/utils/utils.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2008-2015 Tobias Brunner
! 3: * Copyright (C) 2005-2008 Martin Willi
! 4: * HSR Hochschule fuer Technik Rapperswil
! 5: *
! 6: * This program is free software; you can redistribute it and/or modify it
! 7: * under the terms of the GNU General Public License as published by the
! 8: * Free Software Foundation; either version 2 of the License, or (at your
! 9: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 10: *
! 11: * This program is distributed in the hope that it will be useful, but
! 12: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 13: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 14: * for more details.
! 15: */
! 16:
! 17: #include "utils.h"
! 18:
! 19: #include <sys/types.h>
! 20: #include <unistd.h>
! 21: #include <limits.h>
! 22: #include <ctype.h>
! 23: #include <errno.h>
! 24: #ifndef WIN32
! 25: # include <signal.h>
! 26: #endif
! 27:
! 28: #ifndef HAVE_CLOSEFROM
! 29: #if defined(__linux__) && defined(HAVE_SYS_SYSCALL_H)
! 30: # include <sys/stat.h>
! 31: # include <fcntl.h>
! 32: # include <sys/syscall.h>
! 33: /* This is from the kernel sources. We limit the length of directory names to
! 34: * 256 as we only use it to enumerate FDs. */
! 35: struct linux_dirent64 {
! 36: uint64_t d_ino;
! 37: int64_t d_off;
! 38: unsigned short d_reclen;
! 39: unsigned char d_type;
! 40: char d_name[256];
! 41: };
! 42: #else /* !defined(__linux__) || !defined(HAVE_SYS_SYSCALL_H) */
! 43: # include <dirent.h>
! 44: #endif /* defined(__linux__) && defined(HAVE_SYS_SYSCALL_H) */
! 45: #endif
! 46:
! 47: #include <library.h>
! 48: #include <collections/enumerator.h>
! 49:
! 50: #define FD_DIR "/proc/self/fd"
! 51:
! 52: #ifdef WIN32
! 53:
! 54: #include <threading/mutex.h>
! 55: #include <threading/condvar.h>
! 56:
! 57: /**
! 58: * Flag to indicate signaled wait_sigint()
! 59: */
! 60: static bool sigint_signaled = FALSE;
! 61:
! 62: /**
! 63: * Condvar to wait in wait_sigint()
! 64: */
! 65: static condvar_t *sigint_cond;
! 66:
! 67: /**
! 68: * Mutex to check signaling()
! 69: */
! 70: static mutex_t *sigint_mutex;
! 71:
! 72: /**
! 73: * Control handler to catch ^C
! 74: */
! 75: static BOOL WINAPI handler(DWORD dwCtrlType)
! 76: {
! 77: switch (dwCtrlType)
! 78: {
! 79: case CTRL_C_EVENT:
! 80: case CTRL_BREAK_EVENT:
! 81: case CTRL_CLOSE_EVENT:
! 82: sigint_mutex->lock(sigint_mutex);
! 83: sigint_signaled = TRUE;
! 84: sigint_cond->signal(sigint_cond);
! 85: sigint_mutex->unlock(sigint_mutex);
! 86: return TRUE;
! 87: default:
! 88: return FALSE;
! 89: }
! 90: }
! 91:
! 92: /**
! 93: * Windows variant
! 94: */
! 95: void wait_sigint()
! 96: {
! 97: SetConsoleCtrlHandler(handler, TRUE);
! 98:
! 99: sigint_mutex = mutex_create(MUTEX_TYPE_DEFAULT);
! 100: sigint_cond = condvar_create(CONDVAR_TYPE_DEFAULT);
! 101:
! 102: sigint_mutex->lock(sigint_mutex);
! 103: while (!sigint_signaled)
! 104: {
! 105: sigint_cond->wait(sigint_cond, sigint_mutex);
! 106: }
! 107: sigint_mutex->unlock(sigint_mutex);
! 108:
! 109: sigint_mutex->destroy(sigint_mutex);
! 110: sigint_cond->destroy(sigint_cond);
! 111: }
! 112:
! 113: #else /* !WIN32 */
! 114:
! 115: /**
! 116: * Unix variant
! 117: */
! 118: void wait_sigint()
! 119: {
! 120: sigset_t set;
! 121:
! 122: sigemptyset(&set);
! 123: sigaddset(&set, SIGINT);
! 124: sigaddset(&set, SIGTERM);
! 125:
! 126: sigprocmask(SIG_BLOCK, &set, NULL);
! 127: while (sigwaitinfo(&set, NULL) == -1 && errno == EINTR)
! 128: {
! 129: /* wait for signal */
! 130: }
! 131: }
! 132:
! 133: #ifndef HAVE_SIGWAITINFO
! 134: int sigwaitinfo(const sigset_t *set, void *info)
! 135: {
! 136: int sig, err;
! 137:
! 138: if (info)
! 139: { /* we don't replicate siginfo_t, fail if anybody tries to use it */
! 140: errno = EINVAL;
! 141: return -1;
! 142: }
! 143: err = sigwait(set, &sig);
! 144: if (err != 0)
! 145: {
! 146: errno = err;
! 147: sig = -1;
! 148: }
! 149: return sig;
! 150: }
! 151: #endif /* HAVE_SIGWAITINFO */
! 152: #endif /* WIN32 */
! 153:
! 154: #ifndef HAVE_CLOSEFROM
! 155: /**
! 156: * Described in header.
! 157: */
! 158: void closefrom(int low_fd)
! 159: {
! 160: int max_fd, dir_fd, fd;
! 161:
! 162: /* try to close only open file descriptors on Linux... */
! 163: #if defined(__linux__) && defined(HAVE_SYS_SYSCALL_H)
! 164: /* By directly using a syscall we avoid any calls that might be unsafe after
! 165: * fork() (e.g. malloc()). */
! 166: char buffer[sizeof(struct linux_dirent64)];
! 167: struct linux_dirent64 *entry;
! 168: int offset, len;
! 169:
! 170: dir_fd = open("/proc/self/fd", O_RDONLY);
! 171: if (dir_fd != -1)
! 172: {
! 173: while ((len = syscall(__NR_getdents64, dir_fd, buffer,
! 174: sizeof(buffer))) > 0)
! 175: {
! 176: for (offset = 0; offset < len; offset += entry->d_reclen)
! 177: {
! 178: entry = (struct linux_dirent64*)(buffer + offset);
! 179: if (!isdigit(entry->d_name[0]))
! 180: {
! 181: continue;
! 182: }
! 183: fd = atoi(entry->d_name);
! 184: if (fd != dir_fd && fd >= low_fd)
! 185: {
! 186: close(fd);
! 187: }
! 188: }
! 189: }
! 190: close(dir_fd);
! 191: return;
! 192: }
! 193: #else /* !defined(__linux__) || !defined(HAVE_SYS_SYSCALL_H) */
! 194: /* This is potentially unsafe when called after fork() in multi-threaded
! 195: * applications. In particular opendir() will require an allocation.
! 196: * Depends on how the malloc() implementation handles such situations. */
! 197: DIR *dir;
! 198: struct dirent *entry;
! 199:
! 200: #ifndef HAVE_DIRFD
! 201: /* if we don't have dirfd() lets close the lowest FD and hope it gets reused
! 202: * by opendir() */
! 203: close(low_fd);
! 204: dir_fd = low_fd++;
! 205: #endif
! 206:
! 207: dir = opendir(FD_DIR);
! 208: if (dir)
! 209: {
! 210: #ifdef HAVE_DIRFD
! 211: dir_fd = dirfd(dir);
! 212: #endif
! 213: while ((entry = readdir(dir)))
! 214: {
! 215: if (!isdigit(entry->d_name[0]))
! 216: {
! 217: continue;
! 218: }
! 219: fd = atoi(entry->d_name);
! 220: if (fd != dir_fd && fd >= low_fd)
! 221: {
! 222: close(fd);
! 223: }
! 224: }
! 225: closedir(dir);
! 226: return;
! 227: }
! 228: #endif /* defined(__linux__) && defined(HAVE_SYS_SYSCALL_H) */
! 229:
! 230: /* ...fall back to closing all fds otherwise */
! 231: #ifdef WIN32
! 232: max_fd = _getmaxstdio();
! 233: #else
! 234: max_fd = (int)sysconf(_SC_OPEN_MAX);
! 235: #endif
! 236: if (max_fd < 0)
! 237: {
! 238: max_fd = 256;
! 239: }
! 240: for (fd = low_fd; fd < max_fd; fd++)
! 241: {
! 242: close(fd);
! 243: }
! 244: }
! 245: #endif /* HAVE_CLOSEFROM */
! 246:
! 247: /**
! 248: * return null
! 249: */
! 250: void *return_null()
! 251: {
! 252: return NULL;
! 253: }
! 254:
! 255: /**
! 256: * returns TRUE
! 257: */
! 258: bool return_true()
! 259: {
! 260: return TRUE;
! 261: }
! 262:
! 263: /**
! 264: * returns FALSE
! 265: */
! 266: bool return_false()
! 267: {
! 268: return FALSE;
! 269: }
! 270:
! 271: /**
! 272: * nop operation
! 273: */
! 274: void nop()
! 275: {
! 276: }
! 277:
! 278: /**
! 279: * See header
! 280: */
! 281: void utils_init()
! 282: {
! 283: #ifdef WIN32
! 284: windows_init();
! 285: #endif
! 286: atomics_init();
! 287: strerror_init();
! 288: }
! 289:
! 290: /**
! 291: * See header
! 292: */
! 293: void utils_deinit()
! 294: {
! 295: #ifdef WIN32
! 296: windows_deinit();
! 297: #endif
! 298: atomics_deinit();
! 299: strerror_deinit();
! 300: }
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