1 /* 2 * ntp_io.c - input/output routines for ntpd. The socket-opening code 3 * was shamelessly stolen from ntpd. 4 */ 5 6 #ifdef HAVE_CONFIG_H 7 # include <config.h> 8 #endif 9 10 #include <stdio.h> 11 #include <signal.h> 12 #include <sys/types.h> 13 #ifdef HAVE_SYS_PARAM_H 14 # include <sys/param.h> 15 #endif /* HAVE_SYS_PARAM_H */ 16 #ifdef HAVE_SYS_TIME_H 17 # include <sys/time.h> 18 #endif 19 #ifdef HAVE_NETINET_IN_H 20 # include <netinet/in.h> 21 #endif 22 #ifdef HAVE_SYS_IOCTL_H 23 # include <sys/ioctl.h> 24 #endif 25 #ifdef HAVE_SYS_SOCKIO_H /* UXPV: SIOC* #defines (Frank Vance <fvance@waii.com>) */ 26 # include <sys/sockio.h> 27 #endif 28 #include <arpa/inet.h> 29 30 #if _BSDI_VERSION >= 199510 31 # include <ifaddrs.h> 32 #endif 33 /* 98/06/01 */ 34 #include "ntp_machine.h" /* 98/06/01 */ 35 #include "ntpd.h" 36 #include "ntp_io.h" 37 #include "ntp_if.h" 38 #include "ntp_stdlib.h" 39 #include "iosignal.h" 40 41 #if defined(HAVE_SIGNALED_IO) 42 static int sigio_block_count = 0; 43 extern void input_handler P((l_fp *)); 44 45 /* 46 * SIGPOLL and SIGIO ROUTINES. 47 */ 48 49 /* 50 * Some systems (MOST) define SIGPOLL == SIGIO, others SIGIO == SIGPOLL, and 51 * a few have separate SIGIO and SIGPOLL signals. This code checks for the 52 * SIGIO == SIGPOLL case at compile time. 53 * Do not defined USE_SIGPOLL or USE_SIGIO. 54 * these are interal only to ntp_io.c! 55 */ 56 # if defined(USE_SIGPOLL) 57 # undef USE_SIGPOLL 58 # endif 59 # if defined(USE_SIGIO) 60 # undef USE_SIGIO 61 # endif 62 63 # if defined(USE_TTY_SIGPOLL) || defined(USE_UDP_SIGPOLL) 64 # define USE_SIGPOLL 65 # endif 66 67 # if !defined(USE_TTY_SIGPOLL) || !defined(USE_UDP_SIGPOLL) 68 # define USE_SIGIO 69 # endif 70 71 # if defined(USE_SIGIO) && defined(USE_SIGPOLL) 72 # if SIGIO == SIGPOLL 73 # define USE_SIGIO 74 # undef USE_SIGPOLL 75 # endif /* SIGIO == SIGPOLL */ 76 # endif /* USE_SIGIO && USE_SIGIO */ 77 78 79 /* 80 * TTY initialization routines. 81 */ 82 int 83 init_clock_sig( 84 struct refclockio *rio 85 ) 86 { 87 # ifdef USE_TTY_SIGPOLL 88 { 89 /* DO NOT ATTEMPT TO MAKE CLOCK-FD A CTTY: not portable, unreliable */ 90 if (ioctl(rio->fd, I_SETSIG, S_INPUT) < 0) 91 { 92 msyslog(LOG_ERR, 93 "init_clock_sig: ioctl(I_SETSIG, S_INPUT) failed: %m"); 94 return 1; 95 } 96 return 0; 97 } 98 # else 99 /* 100 * Special cases first! 101 */ 102 /* Was: defined(SYS_HPUX) */ 103 # if defined(FIOSSAIOOWN) && defined(FIOSNBIO) && defined(FIOSSAIOSTAT) 104 #define CLOCK_DONE 105 { 106 int pgrp, on = 1; 107 108 /* DO NOT ATTEMPT TO MAKE CLOCK-FD A CTTY: not portable, unreliable */ 109 pgrp = getpid(); 110 if (ioctl(rio->fd, FIOSSAIOOWN, (char *)&pgrp) == -1) 111 { 112 msyslog(LOG_ERR, "ioctl(FIOSSAIOOWN) fails for clock I/O: %m"); 113 exit(1); 114 /*NOTREACHED*/ 115 } 116 117 /* 118 * set non-blocking, async I/O on the descriptor 119 */ 120 if (ioctl(rio->fd, FIOSNBIO, (char *)&on) == -1) 121 { 122 msyslog(LOG_ERR, "ioctl(FIOSNBIO) fails for clock I/O: %m"); 123 exit(1); 124 /*NOTREACHED*/ 125 } 126 127 if (ioctl(rio->fd, FIOSSAIOSTAT, (char *)&on) == -1) 128 { 129 msyslog(LOG_ERR, "ioctl(FIOSSAIOSTAT) fails for clock I/O: %m"); 130 exit(1); 131 /*NOTREACHED*/ 132 } 133 return 0; 134 } 135 # endif /* SYS_HPUX: FIOSSAIOOWN && FIOSNBIO && FIOSSAIOSTAT */ 136 /* Was: defined(SYS_AIX) && !defined(_BSD) */ 137 # if !defined(_BSD) && defined(_AIX) && defined(FIOASYNC) && defined(FIOSETOWN) 138 /* 139 * SYSV compatibility mode under AIX. 140 */ 141 #define CLOCK_DONE 142 { 143 int pgrp, on = 1; 144 145 /* DO NOT ATTEMPT TO MAKE CLOCK-FD A CTTY: not portable, unreliable */ 146 if (ioctl(rio->fd, FIOASYNC, (char *)&on) == -1) 147 { 148 msyslog(LOG_ERR, "ioctl(FIOASYNC) fails for clock I/O: %m"); 149 return 1; 150 } 151 pgrp = -getpid(); 152 if (ioctl(rio->fd, FIOSETOWN, (char*)&pgrp) == -1) 153 { 154 msyslog(LOG_ERR, "ioctl(FIOSETOWN) fails for clock I/O: %m"); 155 return 1; 156 } 157 158 if (fcntl(rio->fd, F_SETFL, FNDELAY|FASYNC) < 0) 159 { 160 msyslog(LOG_ERR, "fcntl(FNDELAY|FASYNC) fails for clock I/O: %m"); 161 return 1; 162 } 163 return 0; 164 } 165 # endif /* AIX && !BSD: !_BSD && FIOASYNC && FIOSETOWN */ 166 # ifndef CLOCK_DONE 167 { 168 /* DO NOT ATTEMPT TO MAKE CLOCK-FD A CTTY: not portable, unreliable */ 169 # if defined(TIOCSCTTY) && defined(USE_FSETOWNCTTY) 170 /* 171 * there are, however, always exceptions to the rules 172 * one is, that OSF accepts SETOWN on TTY fd's only, iff they are 173 * CTTYs. SunOS and HPUX do not semm to have this restriction. 174 * another question is: how can you do multiple SIGIO from several 175 * ttys (as they all should be CTTYs), wondering... 176 * 177 * kd 95-07-16 178 */ 179 if (ioctl(rio->fd, TIOCSCTTY, 0) == -1) 180 { 181 msyslog(LOG_ERR, "ioctl(TIOCSCTTY, 0) fails for clock I/O: %m"); 182 return 1; 183 } 184 # endif /* TIOCSCTTY && USE_FSETOWNCTTY */ 185 186 if (fcntl(rio->fd, F_SETOWN, getpid()) == -1) 187 { 188 msyslog(LOG_ERR, "fcntl(F_SETOWN) fails for clock I/O: %m"); 189 return 1; 190 } 191 192 if (fcntl(rio->fd, F_SETFL, FNDELAY|FASYNC) < 0) 193 { 194 msyslog(LOG_ERR, 195 "fcntl(FNDELAY|FASYNC) fails for clock I/O: %m"); 196 return 1; 197 } 198 return 0; 199 } 200 # endif /* CLOCK_DONE */ 201 # endif /* !USE_TTY_SIGPOLL */ 202 } 203 204 205 206 void 207 init_socket_sig( 208 int fd 209 ) 210 { 211 # ifdef USE_UDP_SIGPOLL 212 { 213 if (ioctl(fd, I_SETSIG, S_INPUT) < 0) 214 { 215 msyslog(LOG_ERR, 216 "init_socket_sig: ioctl(I_SETSIG, S_INPUT) failed: %m"); 217 exit(1); 218 } 219 } 220 # else /* USE_UDP_SIGPOLL */ 221 { 222 int pgrp; 223 # ifdef FIOASYNC 224 int on = 1; 225 # endif 226 227 # if defined(FIOASYNC) 228 if (ioctl(fd, FIOASYNC, (char *)&on) == -1) 229 { 230 msyslog(LOG_ERR, "ioctl(FIOASYNC) fails: %m"); 231 exit(1); 232 /*NOTREACHED*/ 233 } 234 # elif defined(FASYNC) 235 { 236 int flags; 237 238 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 239 { 240 msyslog(LOG_ERR, "fcntl(F_GETFL) fails: %m"); 241 exit(1); 242 /*NOTREACHED*/ 243 } 244 if (fcntl(fd, F_SETFL, flags|FASYNC) < 0) 245 { 246 msyslog(LOG_ERR, "fcntl(...|FASYNC) fails: %m"); 247 exit(1); 248 /*NOTREACHED*/ 249 } 250 } 251 # else 252 # include "Bletch: Need asynchronous I/O!" 253 # endif 254 255 # ifdef UDP_BACKWARDS_SETOWN 256 pgrp = -getpid(); 257 # else 258 pgrp = getpid(); 259 # endif 260 261 # if defined(SIOCSPGRP) 262 if (ioctl(fd, SIOCSPGRP, (char *)&pgrp) == -1) 263 { 264 msyslog(LOG_ERR, "ioctl(SIOCSPGRP) fails: %m"); 265 exit(1); 266 /*NOTREACHED*/ 267 } 268 # elif defined(FIOSETOWN) 269 if (ioctl(fd, FIOSETOWN, (char*)&pgrp) == -1) 270 { 271 msyslog(LOG_ERR, "ioctl(FIOSETOWN) fails: %m"); 272 exit(1); 273 /*NOTREACHED*/ 274 } 275 # elif defined(F_SETOWN) 276 if (fcntl(fd, F_SETOWN, pgrp) == -1) 277 { 278 msyslog(LOG_ERR, "fcntl(F_SETOWN) fails: %m"); 279 exit(1); 280 /*NOTREACHED*/ 281 } 282 # else 283 # include "Bletch: Need to set process(group) to receive SIG(IO|POLL)" 284 # endif 285 } 286 # endif /* USE_UDP_SIGPOLL */ 287 } 288 289 RETSIGTYPE 290 sigio_handler( 291 int sig 292 ) 293 { 294 int saved_errno = errno; 295 l_fp ts; 296 297 get_systime(&ts); 298 (void)input_handler(&ts); 299 errno = saved_errno; 300 } 301 302 /* 303 * Signal support routines. 304 */ 305 # ifdef HAVE_SIGACTION 306 void 307 set_signal(void) 308 { 309 # ifdef USE_SIGIO 310 (void) signal_no_reset(SIGIO, sigio_handler); 311 # endif 312 # ifdef USE_SIGPOLL 313 (void) signal_no_reset(SIGPOLL, sigio_handler); 314 # endif 315 } 316 317 void 318 block_io_and_alarm(void) 319 { 320 sigset_t set; 321 322 if (sigemptyset(&set)) 323 msyslog(LOG_ERR, "block_io_and_alarm: sigemptyset() failed: %m"); 324 # if defined(USE_SIGIO) 325 if (sigaddset(&set, SIGIO)) 326 msyslog(LOG_ERR, "block_io_and_alarm: sigaddset(SIGIO) failed: %m"); 327 # endif 328 # if defined(USE_SIGPOLL) 329 if (sigaddset(&set, SIGPOLL)) 330 msyslog(LOG_ERR, "block_io_and_alarm: sigaddset(SIGPOLL) failed: %m"); 331 # endif 332 if (sigaddset(&set, SIGALRM)) 333 msyslog(LOG_ERR, "block_io_and_alarm: sigaddset(SIGALRM) failed: %m"); 334 335 if (sigprocmask(SIG_BLOCK, &set, NULL)) 336 msyslog(LOG_ERR, "block_io_and_alarm: sigprocmask() failed: %m"); 337 } 338 339 void 340 block_sigio(void) 341 { 342 sigset_t set; 343 344 ++sigio_block_count; 345 if (sigio_block_count > 1) 346 msyslog(LOG_INFO, "block_sigio: sigio_block_count > 1"); 347 if (sigio_block_count < 1) 348 msyslog(LOG_INFO, "block_sigio: sigio_block_count < 1"); 349 350 if (sigemptyset(&set)) 351 msyslog(LOG_ERR, "block_sigio: sigemptyset() failed: %m"); 352 # if defined(USE_SIGIO) 353 if (sigaddset(&set, SIGIO)) 354 msyslog(LOG_ERR, "block_sigio: sigaddset(SIGIO) failed: %m"); 355 # endif 356 # if defined(USE_SIGPOLL) 357 if (sigaddset(&set, SIGPOLL)) 358 msyslog(LOG_ERR, "block_sigio: sigaddset(SIGPOLL) failed: %m"); 359 # endif 360 361 if (sigprocmask(SIG_BLOCK, &set, NULL)) 362 msyslog(LOG_ERR, "block_sigio: sigprocmask() failed: %m"); 363 } 364 365 void 366 unblock_io_and_alarm(void) 367 { 368 sigset_t unset; 369 370 if (sigemptyset(&unset)) 371 msyslog(LOG_ERR, "unblock_io_and_alarm: sigemptyset() failed: %m"); 372 373 # if defined(USE_SIGIO) 374 if (sigaddset(&unset, SIGIO)) 375 msyslog(LOG_ERR, "unblock_io_and_alarm: sigaddset(SIGIO) failed: %m"); 376 # endif 377 # if defined(USE_SIGPOLL) 378 if (sigaddset(&unset, SIGPOLL)) 379 msyslog(LOG_ERR, "unblock_io_and_alarm: sigaddset(SIGPOLL) failed: %m"); 380 # endif 381 if (sigaddset(&unset, SIGALRM)) 382 msyslog(LOG_ERR, "unblock_io_and_alarm: sigaddset(SIGALRM) failed: %m"); 383 384 if (sigprocmask(SIG_UNBLOCK, &unset, NULL)) 385 msyslog(LOG_ERR, "unblock_io_and_alarm: sigprocmask() failed: %m"); 386 } 387 388 void 389 unblock_sigio(void) 390 { 391 sigset_t unset; 392 393 --sigio_block_count; 394 if (sigio_block_count > 0) 395 msyslog(LOG_INFO, "unblock_sigio: sigio_block_count > 0"); 396 if (sigio_block_count < 0) 397 msyslog(LOG_INFO, "unblock_sigio: sigio_block_count < 0"); 398 399 if (sigemptyset(&unset)) 400 msyslog(LOG_ERR, "unblock_sigio: sigemptyset() failed: %m"); 401 402 # if defined(USE_SIGIO) 403 if (sigaddset(&unset, SIGIO)) 404 msyslog(LOG_ERR, "unblock_sigio: sigaddset(SIGIO) failed: %m"); 405 # endif 406 # if defined(USE_SIGPOLL) 407 if (sigaddset(&unset, SIGPOLL)) 408 msyslog(LOG_ERR, "unblock_sigio: sigaddset(SIGPOLL) failed: %m"); 409 # endif 410 411 if (sigprocmask(SIG_UNBLOCK, &unset, NULL)) 412 msyslog(LOG_ERR, "unblock_sigio: sigprocmask() failed: %m"); 413 } 414 415 void 416 wait_for_signal(void) 417 { 418 sigset_t old; 419 420 if (sigprocmask(SIG_UNBLOCK, NULL, &old)) 421 msyslog(LOG_ERR, "wait_for_signal: sigprocmask() failed: %m"); 422 423 # if defined(USE_SIGIO) 424 if (sigdelset(&old, SIGIO)) 425 msyslog(LOG_ERR, "wait_for_signal: sigdelset(SIGIO) failed: %m"); 426 # endif 427 # if defined(USE_SIGPOLL) 428 if (sigdelset(&old, SIGPOLL)) 429 msyslog(LOG_ERR, "wait_for_signal: sigdelset(SIGPOLL) failed: %m"); 430 # endif 431 if (sigdelset(&old, SIGALRM)) 432 msyslog(LOG_ERR, "wait_for_signal: sigdelset(SIGALRM) failed: %m"); 433 434 if (sigsuspend(&old) && (errno != EINTR)) 435 msyslog(LOG_ERR, "wait_for_signal: sigsuspend() failed: %m"); 436 } 437 438 # else /* !HAVE_SIGACTION */ 439 /* 440 * Must be an old bsd system. 441 * We assume there is no SIGPOLL. 442 */ 443 444 void 445 block_io_and_alarm(void) 446 { 447 int mask; 448 449 mask = sigmask(SIGIO) | sigmask(SIGALRM); 450 if (sigblock(mask)) 451 msyslog(LOG_ERR, "block_io_and_alarm: sigblock() failed: %m"); 452 } 453 454 void 455 block_sigio(void) 456 { 457 int mask; 458 459 ++sigio_block_count; 460 if (sigio_block_count > 1) 461 msyslog(LOG_INFO, "block_sigio: sigio_block_count > 1"); 462 if (sigio_block_count < 1) 463 msyslog(LOG_INFO, "block_sigio: sigio_block_count < 1"); 464 465 mask = sigmask(SIGIO); 466 if (sigblock(mask)) 467 msyslog(LOG_ERR, "block_sigio: sigblock() failed: %m"); 468 } 469 470 void 471 set_signal(void) 472 { 473 (void) signal_no_reset(SIGIO, sigio_handler); 474 } 475 476 void 477 unblock_io_and_alarm(void) 478 { 479 int mask, omask; 480 481 mask = sigmask(SIGIO) | sigmask(SIGALRM); 482 omask = sigblock(0); 483 omask &= ~mask; 484 (void) sigsetmask(omask); 485 } 486 487 void 488 unblock_sigio(void) 489 { 490 int mask, omask; 491 492 --sigio_block_count; 493 if (sigio_block_count > 0) 494 msyslog(LOG_INFO, "unblock_sigio: sigio_block_count > 0"); 495 if (sigio_block_count < 0) 496 msyslog(LOG_INFO, "unblock_sigio: sigio_block_count < 0"); 497 mask = sigmask(SIGIO); 498 omask = sigblock(0); 499 omask &= ~mask; 500 (void) sigsetmask(omask); 501 } 502 503 void 504 wait_for_signal(void) 505 { 506 int mask, omask; 507 508 mask = sigmask(SIGIO) | sigmask(SIGALRM); 509 omask = sigblock(0); 510 omask &= ~mask; 511 if (sigpause(omask) && (errno != EINTR)) 512 msyslog(LOG_ERR, "wait_for_signal: sigspause() failed: %m"); 513 } 514 515 # endif /* HAVE_SIGACTION */ 516 #else 517 int NotAnEmptyCompilationUnit; 518 #endif 519