1 2 /*--------------------------------------------------------------------*/ 3 /*--- File- and socket-related libc stuff. m_libcfile.c ---*/ 4 /*--------------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2000-2010 Julian Seward 11 jseward (at) acm.org 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26 02111-1307, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 */ 30 31 #include "pub_core_basics.h" 32 #include "pub_core_vki.h" 33 #include "pub_core_vkiscnums.h" 34 #include "pub_core_debuglog.h" 35 #include "pub_core_libcbase.h" 36 #include "pub_core_libcassert.h" 37 #include "pub_core_libcfile.h" 38 #include "pub_core_libcprint.h" // VG_(sprintf) 39 #include "pub_core_libcproc.h" // VG_(getpid), VG_(getppid) 40 #include "pub_core_xarray.h" 41 #include "pub_core_clientstate.h" // VG_(fd_hard_limit) 42 #include "pub_core_syscall.h" 43 44 /* IMPORTANT: on Darwin it is essential to use the _nocancel versions 45 of syscalls rather than the vanilla version, if a _nocancel version 46 is available. See docs/internals/Darwin-notes.txt for the reason 47 why. */ 48 49 /* --------------------------------------------------------------------- 50 File stuff 51 ------------------------------------------------------------------ */ 52 53 static inline Bool fd_exists(Int fd) 54 { 55 struct vg_stat st; 56 return VG_(fstat)(fd, &st) == 0; 57 } 58 59 /* Move an fd into the Valgrind-safe range */ 60 Int VG_(safe_fd)(Int oldfd) 61 { 62 Int newfd; 63 64 vg_assert(VG_(fd_hard_limit) != -1); 65 66 newfd = VG_(fcntl)(oldfd, VKI_F_DUPFD, VG_(fd_hard_limit)); 67 if (newfd != -1) 68 VG_(close)(oldfd); 69 70 /* Set the close-on-exec flag for this fd. */ 71 VG_(fcntl)(newfd, VKI_F_SETFD, VKI_FD_CLOEXEC); 72 73 vg_assert(newfd >= VG_(fd_hard_limit)); 74 return newfd; 75 } 76 77 /* Given a file descriptor, attempt to deduce its filename. To do 78 this, we use /proc/self/fd/<FD>. If this doesn't point to a file, 79 or if it doesn't exist, we return False. */ 80 Bool VG_(resolve_filename) ( Int fd, HChar* buf, Int n_buf ) 81 { 82 # if defined(VGO_linux) 83 HChar tmp[64]; 84 VG_(sprintf)(tmp, "/proc/self/fd/%d", fd); 85 VG_(memset)(buf, 0, n_buf); 86 if (VG_(readlink)(tmp, buf, n_buf) > 0 && buf[0] == '/') 87 return True; 88 else 89 return False; 90 91 # elif defined(VGO_aix5) 92 I_die_here; /* maybe just return False? */ 93 return False; 94 95 # elif defined(VGO_darwin) 96 HChar tmp[VKI_MAXPATHLEN+1]; 97 if (0 == VG_(fcntl)(fd, VKI_F_GETPATH, (UWord)tmp)) { 98 if (n_buf > 0) { 99 VG_(strncpy)( buf, tmp, n_buf < sizeof(tmp) ? n_buf : sizeof(tmp) ); 100 buf[n_buf-1] = 0; 101 } 102 if (tmp[0] == '/') return True; 103 } 104 return False; 105 106 # else 107 # error Unknown OS 108 # endif 109 } 110 111 SysRes VG_(open) ( const Char* pathname, Int flags, Int mode ) 112 { 113 # if defined(VGO_linux) || defined(VGO_aix5) 114 SysRes res = VG_(do_syscall3)(__NR_open, 115 (UWord)pathname, flags, mode); 116 # elif defined(VGO_darwin) 117 SysRes res = VG_(do_syscall3)(__NR_open_nocancel, 118 (UWord)pathname, flags, mode); 119 # else 120 # error Unknown OS 121 # endif 122 return res; 123 } 124 125 void VG_(close) ( Int fd ) 126 { 127 /* Hmm. Return value is not checked. That's uncool. */ 128 # if defined(VGO_linux) || defined(VGO_aix5) 129 (void)VG_(do_syscall1)(__NR_close, fd); 130 # elif defined(VGO_darwin) 131 (void)VG_(do_syscall1)(__NR_close_nocancel, fd); 132 # else 133 # error Unknown OS 134 # endif 135 } 136 137 Int VG_(read) ( Int fd, void* buf, Int count) 138 { 139 Int ret; 140 # if defined(VGO_linux) || defined(VGO_aix5) 141 SysRes res = VG_(do_syscall3)(__NR_read, fd, (UWord)buf, count); 142 # elif defined(VGO_darwin) 143 SysRes res = VG_(do_syscall3)(__NR_read_nocancel, fd, (UWord)buf, count); 144 # else 145 # error Unknown OS 146 # endif 147 if (sr_isError(res)) { 148 ret = - (Int)(Word)sr_Err(res); 149 vg_assert(ret < 0); 150 } else { 151 ret = (Int)(Word)sr_Res(res); 152 vg_assert(ret >= 0); 153 } 154 return ret; 155 } 156 157 Int VG_(write) ( Int fd, const void* buf, Int count) 158 { 159 Int ret; 160 # if defined(VGO_linux) || defined(VGO_aix5) 161 SysRes res = VG_(do_syscall3)(__NR_write, fd, (UWord)buf, count); 162 # elif defined(VGO_darwin) 163 SysRes res = VG_(do_syscall3)(__NR_write_nocancel, fd, (UWord)buf, count); 164 # else 165 # error "Unknown OS" 166 # endif 167 if (sr_isError(res)) { 168 ret = - (Int)(Word)sr_Err(res); 169 vg_assert(ret < 0); 170 } else { 171 ret = (Int)(Word)sr_Res(res); 172 vg_assert(ret >= 0); 173 } 174 return ret; 175 } 176 177 178 Int VG_(pipe) ( Int fd[2] ) 179 { 180 # if defined(VGO_linux) || defined(VGO_aix5) 181 SysRes res = VG_(do_syscall1)(__NR_pipe, (UWord)fd); 182 return sr_isError(res) ? -1 : 0; 183 # elif defined(VGO_darwin) 184 /* __NR_pipe is UX64, so produces a double-word result */ 185 SysRes res = VG_(do_syscall0)(__NR_pipe); 186 if (!sr_isError(res)) { 187 fd[0] = (Int)sr_Res(res); 188 fd[1] = (Int)sr_ResHI(res); 189 } 190 return sr_isError(res) ? -1 : 0; 191 # else 192 # error "Unknown OS" 193 # endif 194 } 195 196 OffT VG_(lseek) ( Int fd, OffT offset, Int whence ) 197 { 198 # if defined(VGO_linux) || defined(VGO_aix5) || defined(VGP_amd64_darwin) 199 SysRes res = VG_(do_syscall3)(__NR_lseek, fd, offset, whence); 200 vg_assert(sizeof(OffT) == sizeof(Word)); 201 # elif defined(VGP_x86_darwin) 202 SysRes res = VG_(do_syscall4)(__NR_lseek, fd, 203 offset & 0xffffffff, offset >> 32, whence); 204 # else 205 # error "Unknown plat" 206 # endif 207 return sr_isError(res) ? (-1) : sr_Res(res); 208 /* if you change the error-reporting conventions of this, also 209 change VG_(pread) and all other usage points. */ 210 } 211 212 extern Int VG_(ftruncate) ( Int fd, OffT length ) { 213 #if defined (VGO_linux) 214 SysRes res = VG_(do_syscall2)(__NR_ftruncate, fd, length); 215 return sr_isError(res) ? (-1) : sr_Res(res); 216 #else 217 return -1; /*UNIMPLEMENTED*/ 218 #endif 219 } 220 221 /* stat/fstat support. It's uggerly. We have impedance-match into a 222 'struct vg_stat' in order to have a single structure that callers 223 can use consistently on all platforms. */ 224 225 #define TRANSLATE_TO_vg_stat(_p_vgstat, _p_vkistat) \ 226 do { \ 227 (_p_vgstat)->dev = (ULong)( (_p_vkistat)->st_dev ); \ 228 (_p_vgstat)->ino = (ULong)( (_p_vkistat)->st_ino ); \ 229 (_p_vgstat)->nlink = (ULong)( (_p_vkistat)->st_nlink ); \ 230 (_p_vgstat)->mode = (UInt) ( (_p_vkistat)->st_mode ); \ 231 (_p_vgstat)->uid = (UInt) ( (_p_vkistat)->st_uid ); \ 232 (_p_vgstat)->gid = (UInt) ( (_p_vkistat)->st_gid ); \ 233 (_p_vgstat)->rdev = (ULong)( (_p_vkistat)->st_rdev ); \ 234 (_p_vgstat)->size = (Long) ( (_p_vkistat)->st_size ); \ 235 (_p_vgstat)->blksize = (ULong)( (_p_vkistat)->st_blksize ); \ 236 (_p_vgstat)->blocks = (ULong)( (_p_vkistat)->st_blocks ); \ 237 (_p_vgstat)->atime = (ULong)( (_p_vkistat)->st_atime ); \ 238 (_p_vgstat)->atime_nsec = (ULong)( (_p_vkistat)->st_atime_nsec ); \ 239 (_p_vgstat)->mtime = (ULong)( (_p_vkistat)->st_mtime ); \ 240 (_p_vgstat)->mtime_nsec = (ULong)( (_p_vkistat)->st_mtime_nsec ); \ 241 (_p_vgstat)->ctime = (ULong)( (_p_vkistat)->st_ctime ); \ 242 (_p_vgstat)->ctime_nsec = (ULong)( (_p_vkistat)->st_ctime_nsec ); \ 243 } while (0) 244 245 SysRes VG_(stat) ( const Char* file_name, struct vg_stat* vgbuf ) 246 { 247 SysRes res; 248 VG_(memset)(vgbuf, 0, sizeof(*vgbuf)); 249 250 # if defined(VGO_linux) || defined(VGO_darwin) 251 /* First try with stat64. If that doesn't work out, fall back to 252 the vanilla version. */ 253 # if defined(__NR_stat64) 254 { struct vki_stat64 buf64; 255 res = VG_(do_syscall2)(__NR_stat64, (UWord)file_name, (UWord)&buf64); 256 if (!(sr_isError(res) && sr_Err(res) == VKI_ENOSYS)) { 257 /* Success, or any failure except ENOSYS */ 258 if (!sr_isError(res)) 259 TRANSLATE_TO_vg_stat(vgbuf, &buf64); 260 return res; 261 } 262 } 263 # endif /* defined(__NR_stat64) */ 264 { struct vki_stat buf; 265 res = VG_(do_syscall2)(__NR_stat, (UWord)file_name, (UWord)&buf); 266 if (!sr_isError(res)) 267 TRANSLATE_TO_vg_stat(vgbuf, &buf); 268 return res; 269 } 270 271 # elif defined(VGO_aix5) 272 { struct vki_stat buf; 273 res = VG_(do_syscall4)(__NR_AIX5_statx, 274 (UWord)file_name, 275 (UWord)&buf, 276 sizeof(struct vki_stat), 277 VKI_STX_NORMAL); 278 if (!sr_isError(res)) { 279 VG_(memset)(vgbuf, 0, sizeof(*vgbuf)); 280 vgbuf->dev = (ULong)buf.st_dev; 281 vgbuf->ino = (ULong)buf.st_ino; 282 vgbuf->mode = (UInt)buf.st_mode; 283 vgbuf->uid = (UInt)buf.st_uid; 284 vgbuf->gid = (UInt)buf.st_gid; 285 vgbuf->size = (Long)buf.st_size; 286 } 287 return res; 288 } 289 290 # else 291 # error Unknown OS 292 # endif 293 } 294 295 Int VG_(fstat) ( Int fd, struct vg_stat* vgbuf ) 296 { 297 SysRes res; 298 VG_(memset)(vgbuf, 0, sizeof(*vgbuf)); 299 300 # if defined(VGO_linux) || defined(VGO_darwin) 301 /* First try with fstat64. If that doesn't work out, fall back to 302 the vanilla version. */ 303 # if defined(__NR_fstat64) 304 { struct vki_stat64 buf64; 305 res = VG_(do_syscall2)(__NR_fstat64, (UWord)fd, (UWord)&buf64); 306 if (!(sr_isError(res) && sr_Err(res) == VKI_ENOSYS)) { 307 /* Success, or any failure except ENOSYS */ 308 if (!sr_isError(res)) 309 TRANSLATE_TO_vg_stat(vgbuf, &buf64); 310 return sr_isError(res) ? (-1) : 0; 311 } 312 } 313 # endif /* if defined(__NR_fstat64) */ 314 { struct vki_stat buf; 315 res = VG_(do_syscall2)(__NR_fstat, (UWord)fd, (UWord)&buf); 316 if (!sr_isError(res)) 317 TRANSLATE_TO_vg_stat(vgbuf, &buf); 318 return sr_isError(res) ? (-1) : 0; 319 } 320 321 # elif defined(VGO_aix5) 322 I_die_here; 323 324 # else 325 # error Unknown OS 326 # endif 327 } 328 329 #undef TRANSLATE_TO_vg_stat 330 331 332 Long VG_(fsize) ( Int fd ) 333 { 334 struct vg_stat buf; 335 Int res = VG_(fstat)( fd, &buf ); 336 return (res == -1) ? (-1LL) : buf.size; 337 } 338 339 Bool VG_(is_dir) ( const HChar* f ) 340 { 341 struct vg_stat buf; 342 SysRes res = VG_(stat)(f, &buf); 343 return sr_isError(res) ? False 344 : VKI_S_ISDIR(buf.mode) ? True : False; 345 } 346 347 SysRes VG_(dup) ( Int oldfd ) 348 { 349 return VG_(do_syscall1)(__NR_dup, oldfd); 350 } 351 352 SysRes VG_(dup2) ( Int oldfd, Int newfd ) 353 { 354 # if defined(VGO_linux) || defined(VGO_darwin) 355 return VG_(do_syscall2)(__NR_dup2, oldfd, newfd); 356 # elif defined(VGO_aix5) 357 I_die_here; 358 # else 359 # error Unknown OS 360 # endif 361 } 362 363 /* Returns -1 on error. */ 364 Int VG_(fcntl) ( Int fd, Int cmd, Addr arg ) 365 { 366 # if defined(VGO_linux) || defined(VGO_aix5) 367 SysRes res = VG_(do_syscall3)(__NR_fcntl, fd, cmd, arg); 368 # elif defined(VGO_darwin) 369 SysRes res = VG_(do_syscall3)(__NR_fcntl_nocancel, fd, cmd, arg); 370 # else 371 # error "Unknown OS" 372 # endif 373 return sr_isError(res) ? -1 : sr_Res(res); 374 } 375 376 Int VG_(rename) ( const Char* old_name, const Char* new_name ) 377 { 378 SysRes res = VG_(do_syscall2)(__NR_rename, (UWord)old_name, (UWord)new_name); 379 return sr_isError(res) ? (-1) : 0; 380 } 381 382 Int VG_(unlink) ( const Char* file_name ) 383 { 384 SysRes res = VG_(do_syscall1)(__NR_unlink, (UWord)file_name); 385 return sr_isError(res) ? (-1) : 0; 386 } 387 388 /* The working directory at startup. AIX doesn't provide an easy 389 system call to do getcwd, but fortunately we don't need arbitrary 390 getcwd support. All that is really needed is to note the cwd at 391 process startup. Hence VG_(record_startup_wd) notes it (in a 392 platform dependent way) and VG_(get_startup_wd) produces the noted 393 value. Hence: */ 394 static HChar startup_wd[VKI_PATH_MAX]; 395 static Bool startup_wd_acquired = False; 396 397 /* Record the process' working directory at startup. Is intended to 398 be called exactly once, at startup, before the working directory 399 changes. Return True for success, False for failure, so that the 400 caller can bomb out suitably without creating module cycles if 401 there is a problem. */ 402 Bool VG_(record_startup_wd) ( void ) 403 { 404 const Int szB = sizeof(startup_wd); 405 vg_assert(!startup_wd_acquired); 406 vg_assert(szB >= 512 && szB <= 16384/*let's say*/); /* stay sane */ 407 VG_(memset)(startup_wd, 0, szB); 408 # if defined(VGO_linux) 409 /* Simple: just ask the kernel */ 410 { SysRes res 411 = VG_(do_syscall2)(__NR_getcwd, (UWord)startup_wd, szB-1); 412 vg_assert(startup_wd[szB-1] == 0); 413 if (sr_isError(res)) { 414 return False; 415 } else { 416 startup_wd_acquired = True; 417 return True; 418 } 419 } 420 # elif defined(VGO_aix5) || defined(VGO_darwin) 421 /* We can't ask the kernel, so instead rely on launcher-*.c to 422 tell us the startup path. Note the env var is keyed to the 423 parent's PID, not ours, since our parent is the launcher 424 process. */ 425 { Char envvar[100]; 426 Char* wd = NULL; 427 VG_(memset)(envvar, 0, sizeof(envvar)); 428 VG_(sprintf)(envvar, "VALGRIND_STARTUP_PWD_%d_XYZZY", 429 (Int)VG_(getppid)()); 430 wd = VG_(getenv)( envvar ); 431 if (wd == NULL || (1+VG_(strlen)(wd) >= szB)) 432 return False; 433 VG_(strncpy_safely)(startup_wd, wd, szB); 434 vg_assert(startup_wd[szB-1] == 0); 435 startup_wd_acquired = True; 436 return True; 437 } 438 # else 439 # error Unknown OS 440 # endif 441 } 442 443 /* Copy the previously acquired startup_wd into buf[0 .. size-1], 444 or return False if buf isn't big enough. */ 445 Bool VG_(get_startup_wd) ( Char* buf, SizeT size ) 446 { 447 vg_assert(startup_wd_acquired); 448 vg_assert(startup_wd[ sizeof(startup_wd)-1 ] == 0); 449 if (1+VG_(strlen)(startup_wd) >= size) 450 return False; 451 VG_(strncpy_safely)(buf, startup_wd, size); 452 return True; 453 } 454 455 Int VG_(readlink) (const Char* path, Char* buf, UInt bufsiz) 456 { 457 SysRes res; 458 /* res = readlink( path, buf, bufsiz ); */ 459 res = VG_(do_syscall3)(__NR_readlink, (UWord)path, (UWord)buf, bufsiz); 460 return sr_isError(res) ? -1 : sr_Res(res); 461 } 462 463 Int VG_(getdents) (Int fd, struct vki_dirent *dirp, UInt count) 464 { 465 # if defined(VGO_linux) || defined(VGO_aix5) 466 SysRes res; 467 /* res = getdents( fd, dirp, count ); */ 468 res = VG_(do_syscall3)(__NR_getdents, fd, (UWord)dirp, count); 469 return sr_isError(res) ? -1 : sr_Res(res); 470 # elif defined(VGO_darwin) 471 I_die_here; 472 # else 473 # error "Unknown OS" 474 # endif 475 } 476 477 /* Check accessibility of a file. Returns zero for access granted, 478 nonzero otherwise. */ 479 Int VG_(access) ( const HChar* path, Bool irusr, Bool iwusr, Bool ixusr ) 480 { 481 # if defined(VGO_linux) 482 /* Very annoyingly, I cannot find any definition for R_OK et al in 483 the kernel interfaces. Therefore I reluctantly resort to 484 hardwiring in these magic numbers that I determined by 485 experimentation. */ 486 # define VKI_R_OK 4 487 # define VKI_W_OK 2 488 # define VKI_X_OK 1 489 # endif 490 491 UWord w = (irusr ? VKI_R_OK : 0) 492 | (iwusr ? VKI_W_OK : 0) 493 | (ixusr ? VKI_X_OK : 0); 494 SysRes res = VG_(do_syscall2)(__NR_access, (UWord)path, w); 495 return sr_isError(res) ? 1 : 0; 496 497 # if defined(VGO_linux) 498 # undef VKI_R_OK 499 # undef VKI_W_OK 500 # undef VKI_X_OK 501 # endif 502 } 503 504 /* 505 Emulate the normal Unix permissions checking algorithm. 506 507 If owner matches, then use the owner permissions, else 508 if group matches, then use the group permissions, else 509 use other permissions. 510 511 Note that we can't deal properly with SUID/SGID. By default 512 (allow_setuid == False), we refuse to run them (otherwise the 513 executable may misbehave if it doesn't have the permissions it 514 thinks it does). However, the caller may indicate that setuid 515 executables are allowed, for example if we are going to exec them 516 but not trace into them (iow, client sys_execve when 517 clo_trace_children == False). 518 519 If VKI_EACCES is returned (iow, permission was refused), then 520 *is_setuid is set to True iff permission was refused because the 521 executable is setuid. 522 */ 523 /* returns: 0 = success, non-0 is failure */ 524 Int VG_(check_executable)(/*OUT*/Bool* is_setuid, 525 const HChar* f, Bool allow_setuid) 526 { 527 struct vg_stat st; 528 SysRes res = VG_(stat)(f, &st); 529 530 if (is_setuid) 531 *is_setuid = False; 532 533 if (sr_isError(res)) { 534 return sr_Err(res); 535 } 536 537 if ( (st.mode & (VKI_S_ISUID | VKI_S_ISGID)) && !allow_setuid ) { 538 if (is_setuid) 539 *is_setuid = True; 540 return VKI_EACCES; 541 } 542 543 if (VG_(geteuid)() == st.uid) { 544 if (!(st.mode & VKI_S_IXUSR)) 545 return VKI_EACCES; 546 } else { 547 Int grpmatch = 0; 548 549 if (VG_(getegid)() == st.gid) 550 grpmatch = 1; 551 else { 552 UInt groups[32]; 553 Int ngrp = VG_(getgroups)(32, groups); 554 Int i; 555 /* ngrp will be -1 if VG_(getgroups) failed. */ 556 for (i = 0; i < ngrp; i++) { 557 if (groups[i] == st.gid) { 558 grpmatch = 1; 559 break; 560 } 561 } 562 } 563 564 if (grpmatch) { 565 if (!(st.mode & VKI_S_IXGRP)) { 566 return VKI_EACCES; 567 } 568 } else if (!(st.mode & VKI_S_IXOTH)) { 569 return VKI_EACCES; 570 } 571 } 572 573 return 0; 574 } 575 576 /* DDD: Note this moves (or at least, is believed to move) the file pointer 577 on Linux and AIX5 but doesn't on Darwin. This inconsistency should 578 be fixed. (In other words, why isn't the Linux/AIX5 version implemented in 579 terms of pread()?) */ 580 SysRes VG_(pread) ( Int fd, void* buf, Int count, OffT offset ) 581 { 582 SysRes res; 583 # if defined(VGO_linux) || defined(VGO_aix5) 584 /* Linux, AIX5 */ 585 OffT off = VG_(lseek)( fd, offset, VKI_SEEK_SET); 586 if (off < 0) 587 return VG_(mk_SysRes_Error)( VKI_EINVAL ); 588 res = VG_(do_syscall3)(__NR_read, fd, (UWord)buf, count ); 589 return res; 590 # elif defined(VGP_amd64_darwin) 591 res = VG_(do_syscall4)(__NR_pread_nocancel, fd, (UWord)buf, count, offset); 592 return res; 593 # elif defined(VGP_x86_darwin) 594 /* ppc32-darwin is the same, but with the args inverted */ 595 res = VG_(do_syscall5)(__NR_pread_nocancel, fd, (UWord)buf, count, 596 offset & 0xffffffff, offset >> 32); 597 return res; 598 # else 599 # error "Unknown platform" 600 # endif 601 } 602 603 /* Create and open (-rw------) a tmp file name incorporating said arg. 604 Returns -1 on failure, else the fd of the file. If fullname is 605 non-NULL, the file's name is written into it. The number of bytes 606 written is guaranteed not to exceed 64+strlen(part_of_name). */ 607 608 Int VG_(mkstemp) ( HChar* part_of_name, /*OUT*/HChar* fullname ) 609 { 610 HChar buf[200]; 611 Int n, tries, fd; 612 UInt seed; 613 SysRes sres; 614 615 vg_assert(part_of_name); 616 n = VG_(strlen)(part_of_name); 617 vg_assert(n > 0 && n < 100); 618 619 seed = (VG_(getpid)() << 9) ^ VG_(getppid)(); 620 621 tries = 0; 622 while (True) { 623 if (++tries > 10) 624 return -1; 625 VG_(sprintf)( buf, "%s/valgrind_%s_%08x", 626 VG_TMPDIR, part_of_name, VG_(random)( &seed )); 627 if (0) 628 VG_(printf)("VG_(mkstemp): trying: %s\n", buf); 629 630 sres = VG_(open)(buf, 631 VKI_O_CREAT|VKI_O_RDWR|VKI_O_EXCL|VKI_O_TRUNC, 632 VKI_S_IRUSR|VKI_S_IWUSR); 633 if (sr_isError(sres)) 634 continue; 635 /* VG_(safe_fd) doesn't return if it fails. */ 636 fd = VG_(safe_fd)( sr_Res(sres) ); 637 if (fullname) 638 VG_(strcpy)( fullname, buf ); 639 return fd; 640 } 641 /* NOTREACHED */ 642 } 643 644 645 /* --------------------------------------------------------------------- 646 Socket-related stuff. 647 ------------------------------------------------------------------ */ 648 649 #if defined(VGO_aix5) 650 struct vki_sockaddr_in; 651 #endif 652 653 static 654 Int parse_inet_addr_and_port ( UChar* str, UInt* ip_addr, UShort* port ); 655 656 static 657 Int my_connect ( Int sockfd, struct vki_sockaddr_in* serv_addr, Int addrlen ); 658 659 UInt VG_(htonl) ( UInt x ) 660 { 661 # if defined(VG_BIGENDIAN) 662 return x; 663 # else 664 return 665 (((x >> 24) & 0xFF) << 0) | (((x >> 16) & 0xFF) << 8) 666 | (((x >> 8) & 0xFF) << 16) | (((x >> 0) & 0xFF) << 24); 667 # endif 668 } 669 670 UInt VG_(ntohl) ( UInt x ) 671 { 672 # if defined(VG_BIGENDIAN) 673 return x; 674 # else 675 return 676 (((x >> 24) & 0xFF) << 0) | (((x >> 16) & 0xFF) << 8) 677 | (((x >> 8) & 0xFF) << 16) | (((x >> 0) & 0xFF) << 24); 678 # endif 679 } 680 681 UShort VG_(htons) ( UShort x ) 682 { 683 # if defined(VG_BIGENDIAN) 684 return x; 685 # else 686 return 687 (((x >> 8) & 0xFF) << 0) | (((x >> 0) & 0xFF) << 8); 688 # endif 689 } 690 691 UShort VG_(ntohs) ( UShort x ) 692 { 693 # if defined(VG_BIGENDIAN) 694 return x; 695 # else 696 return 697 (((x >> 8) & 0xFF) << 0) | (((x >> 0) & 0xFF) << 8); 698 # endif 699 } 700 701 702 /* The main function. 703 704 Supplied string contains either an ip address "192.168.0.1" or 705 an ip address and port pair, "192.168.0.1:1500". Parse these, 706 and return: 707 -1 if there is a parse error 708 -2 if no parse error, but specified host:port cannot be opened 709 the relevant file (socket) descriptor, otherwise. 710 is used. 711 */ 712 Int VG_(connect_via_socket)( UChar* str ) 713 { 714 # if defined(VGO_linux) || defined(VGO_darwin) 715 Int sd, res; 716 struct vki_sockaddr_in servAddr; 717 UInt ip = 0; 718 UShort port = VG_CLO_DEFAULT_LOGPORT; 719 Bool ok = parse_inet_addr_and_port(str, &ip, &port); 720 if (!ok) 721 return -1; 722 723 //if (0) 724 // VG_(printf)("ip = %d.%d.%d.%d, port %d\n", 725 // (ip >> 24) & 0xFF, (ip >> 16) & 0xFF, 726 // (ip >> 8) & 0xFF, ip & 0xFF, 727 // (UInt)port ); 728 729 servAddr.sin_family = VKI_AF_INET; 730 servAddr.sin_addr.s_addr = VG_(htonl)(ip); 731 servAddr.sin_port = VG_(htons)(port); 732 733 /* create socket */ 734 sd = VG_(socket)(VKI_AF_INET, VKI_SOCK_STREAM, 0 /* IPPROTO_IP ? */); 735 if (sd < 0) { 736 /* this shouldn't happen ... nevertheless */ 737 return -2; 738 } 739 740 /* connect to server */ 741 res = my_connect(sd, &servAddr, sizeof(servAddr)); 742 if (res < 0) { 743 /* connection failed */ 744 return -2; 745 } 746 747 return sd; 748 749 # elif defined(VGO_aix5) 750 I_die_here; 751 752 # else 753 # error "Unknown OS" 754 # endif 755 } 756 757 758 /* Let d = one or more digits. Accept either: 759 d.d.d.d or d.d.d.d:d 760 */ 761 static Int parse_inet_addr_and_port ( UChar* str, UInt* ip_addr, UShort* port ) 762 { 763 # define GET_CH ((*str) ? (*str++) : 0) 764 UInt ipa, i, j, c, any; 765 ipa = 0; 766 for (i = 0; i < 4; i++) { 767 j = 0; 768 any = 0; 769 while (1) { 770 c = GET_CH; 771 if (c < '0' || c > '9') break; 772 j = 10 * j + (int)(c - '0'); 773 any = 1; 774 } 775 if (any == 0 || j > 255) goto syntaxerr; 776 ipa = (ipa << 8) + j; 777 if (i <= 2 && c != '.') goto syntaxerr; 778 } 779 if (c == 0 || c == ':') 780 *ip_addr = ipa; 781 if (c == 0) goto ok; 782 if (c != ':') goto syntaxerr; 783 j = 0; 784 any = 0; 785 while (1) { 786 c = GET_CH; 787 if (c < '0' || c > '9') break; 788 j = j * 10 + (int)(c - '0'); 789 any = 1; 790 if (j > 65535) goto syntaxerr; 791 } 792 if (any == 0 || c != 0) goto syntaxerr; 793 if (j < 1024) goto syntaxerr; 794 *port = (UShort)j; 795 ok: 796 return 1; 797 syntaxerr: 798 return 0; 799 # undef GET_CH 800 } 801 802 // GrP fixme safe_fd? 803 Int VG_(socket) ( Int domain, Int type, Int protocol ) 804 { 805 # if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \ 806 || defined(VGP_ppc64_linux) 807 SysRes res; 808 UWord args[3]; 809 args[0] = domain; 810 args[1] = type; 811 args[2] = protocol; 812 res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_SOCKET, (UWord)&args); 813 return sr_isError(res) ? -1 : sr_Res(res); 814 815 # elif defined(VGP_amd64_linux) || defined(VGP_arm_linux) 816 SysRes res; 817 res = VG_(do_syscall3)(__NR_socket, domain, type, protocol ); 818 return sr_isError(res) ? -1 : sr_Res(res); 819 820 # elif defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) 821 I_die_here; 822 823 # elif defined(VGO_darwin) 824 SysRes res; 825 res = VG_(do_syscall3)(__NR_socket, domain, type, protocol); 826 if (!sr_isError(res)) { 827 // Set SO_NOSIGPIPE so write() returns EPIPE instead of raising SIGPIPE 828 Int optval = 1; 829 SysRes res2; 830 res2 = VG_(do_syscall5)(__NR_setsockopt, sr_Res(res), VKI_SOL_SOCKET, 831 VKI_SO_NOSIGPIPE, (UWord)&optval, 832 sizeof(optval)); 833 // ignore setsockopt() error 834 } 835 return sr_isError(res) ? -1 : sr_Res(res); 836 837 # else 838 # error "Unknown arch" 839 # endif 840 } 841 842 843 static 844 Int my_connect ( Int sockfd, struct vki_sockaddr_in* serv_addr, Int addrlen ) 845 { 846 # if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \ 847 || defined(VGP_ppc64_linux) 848 SysRes res; 849 UWord args[3]; 850 args[0] = sockfd; 851 args[1] = (UWord)serv_addr; 852 args[2] = addrlen; 853 res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_CONNECT, (UWord)&args); 854 return sr_isError(res) ? -1 : sr_Res(res); 855 856 # elif defined(VGP_amd64_linux) || defined(VGP_arm_linux) 857 SysRes res; 858 res = VG_(do_syscall3)(__NR_connect, sockfd, (UWord)serv_addr, addrlen); 859 return sr_isError(res) ? -1 : sr_Res(res); 860 861 # elif defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) 862 I_die_here; 863 864 # elif defined(VGO_darwin) 865 SysRes res; 866 res = VG_(do_syscall3)(__NR_connect_nocancel, 867 sockfd, (UWord)serv_addr, addrlen); 868 return sr_isError(res) ? -1 : sr_Res(res); 869 870 # else 871 # error "Unknown arch" 872 # endif 873 } 874 875 Int VG_(write_socket)( Int sd, void *msg, Int count ) 876 { 877 /* This is actually send(). */ 878 879 /* For Linux, VKI_MSG_NOSIGNAL is a request not to send SIGPIPE on 880 errors on stream oriented sockets when the other end breaks the 881 connection. The EPIPE error is still returned. 882 883 For Darwin, VG_(socket)() sets SO_NOSIGPIPE to get EPIPE instead of 884 SIGPIPE */ 885 886 # if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \ 887 || defined(VGP_ppc64_linux) 888 SysRes res; 889 UWord args[4]; 890 args[0] = sd; 891 args[1] = (UWord)msg; 892 args[2] = count; 893 args[3] = VKI_MSG_NOSIGNAL; 894 res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_SEND, (UWord)&args); 895 return sr_isError(res) ? -1 : sr_Res(res); 896 897 # elif defined(VGP_amd64_linux) || defined(VGP_arm_linux) 898 SysRes res; 899 res = VG_(do_syscall6)(__NR_sendto, sd, (UWord)msg, 900 count, VKI_MSG_NOSIGNAL, 0,0); 901 return sr_isError(res) ? -1 : sr_Res(res); 902 903 # elif defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) 904 I_die_here; 905 906 # elif defined(VGP_x86_darwin) || defined(VGP_amd64_darwin) 907 SysRes res; 908 res = VG_(do_syscall3)(__NR_write_nocancel, sd, (UWord)msg, count); 909 return sr_isError(res) ? -1 : sr_Res(res); 910 911 # else 912 # error "Unknown platform" 913 # endif 914 } 915 916 Int VG_(getsockname) ( Int sd, struct vki_sockaddr *name, Int *namelen) 917 { 918 # if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \ 919 || defined(VGP_ppc64_linux) 920 SysRes res; 921 UWord args[3]; 922 args[0] = sd; 923 args[1] = (UWord)name; 924 args[2] = (UWord)namelen; 925 res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_GETSOCKNAME, (UWord)&args); 926 return sr_isError(res) ? -1 : sr_Res(res); 927 928 # elif defined(VGP_amd64_linux) || defined(VGP_arm_linux) 929 SysRes res; 930 res = VG_(do_syscall3)( __NR_getsockname, 931 (UWord)sd, (UWord)name, (UWord)namelen ); 932 return sr_isError(res) ? -1 : sr_Res(res); 933 934 # elif defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) 935 I_die_here; 936 937 # elif defined(VGO_darwin) 938 SysRes res; 939 res = VG_(do_syscall3)( __NR_getsockname, 940 (UWord)sd, (UWord)name, (UWord)namelen ); 941 return sr_isError(res) ? -1 : sr_Res(res); 942 943 # else 944 # error "Unknown platform" 945 # endif 946 } 947 948 Int VG_(getpeername) ( Int sd, struct vki_sockaddr *name, Int *namelen) 949 { 950 # if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \ 951 || defined(VGP_ppc64_linux) 952 SysRes res; 953 UWord args[3]; 954 args[0] = sd; 955 args[1] = (UWord)name; 956 args[2] = (UWord)namelen; 957 res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_GETPEERNAME, (UWord)&args); 958 return sr_isError(res) ? -1 : sr_Res(res); 959 960 # elif defined(VGP_amd64_linux) || defined(VGP_arm_linux) 961 SysRes res; 962 res = VG_(do_syscall3)( __NR_getpeername, 963 (UWord)sd, (UWord)name, (UWord)namelen ); 964 return sr_isError(res) ? -1 : sr_Res(res); 965 966 # elif defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) 967 I_die_here; 968 969 # elif defined(VGO_darwin) 970 SysRes res; 971 res = VG_(do_syscall3)( __NR_getpeername, 972 (UWord)sd, (UWord)name, (UWord)namelen ); 973 return sr_isError(res) ? -1 : sr_Res(res); 974 975 # else 976 # error "Unknown platform" 977 # endif 978 } 979 980 Int VG_(getsockopt) ( Int sd, Int level, Int optname, void *optval, 981 Int *optlen) 982 { 983 # if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \ 984 || defined(VGP_ppc64_linux) 985 SysRes res; 986 UWord args[5]; 987 args[0] = sd; 988 args[1] = level; 989 args[2] = optname; 990 args[3] = (UWord)optval; 991 args[4] = (UWord)optlen; 992 res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_GETSOCKOPT, (UWord)&args); 993 return sr_isError(res) ? -1 : sr_Res(res); 994 995 # elif defined(VGP_amd64_linux) || defined(VGP_arm_linux) 996 SysRes res; 997 res = VG_(do_syscall5)( __NR_getsockopt, 998 (UWord)sd, (UWord)level, (UWord)optname, 999 (UWord)optval, (UWord)optlen ); 1000 return sr_isError(res) ? -1 : sr_Res(res); 1001 1002 # elif defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) 1003 I_die_here; 1004 1005 # elif defined(VGO_darwin) 1006 SysRes res; 1007 res = VG_(do_syscall5)( __NR_getsockopt, 1008 (UWord)sd, (UWord)level, (UWord)optname, 1009 (UWord)optval, (UWord)optlen ); 1010 return sr_isError(res) ? -1 : sr_Res(res); 1011 1012 # else 1013 # error "Unknown platform" 1014 # endif 1015 } 1016 1017 1018 Char *VG_(basename)(const Char *path) 1019 { 1020 static Char buf[VKI_PATH_MAX]; 1021 1022 const Char *p, *end; 1023 1024 if (path == NULL || 1025 0 == VG_(strcmp)(path, "")) 1026 { 1027 return "."; 1028 } 1029 1030 p = path + VG_(strlen)(path); 1031 while (p > path && *p == '/') { 1032 // skip all trailing '/' 1033 p--; 1034 } 1035 1036 if (p == path && *p == '/') return "/"; // all slashes 1037 1038 end = p; 1039 1040 while (p > path && *p != '/') { 1041 // now skip non '/' 1042 p--; 1043 } 1044 1045 if (*p == '/') p++; 1046 1047 VG_(strncpy)(buf, p, end-p+1); 1048 buf[end-p+1] = '\0'; 1049 1050 return buf; 1051 } 1052 1053 1054 Char *VG_(dirname)(const Char *path) 1055 { 1056 static Char buf[VKI_PATH_MAX]; 1057 1058 const Char *p; 1059 1060 if (path == NULL || 1061 0 == VG_(strcmp)(path, "") || 1062 0 == VG_(strcmp)(path, "/")) 1063 { 1064 return "."; 1065 } 1066 1067 p = path + VG_(strlen)(path); 1068 while (p > path && *p == '/') { 1069 // skip all trailing '/' 1070 p--; 1071 } 1072 1073 while (p > path && *p != '/') { 1074 // now skip non '/' 1075 p--; 1076 } 1077 1078 if (p == path) { 1079 if (*p == '/') return "/"; // all slashes 1080 else return "."; // no slashes 1081 } 1082 1083 while (p > path && *p == '/') { 1084 // skip '/' again 1085 p--; 1086 } 1087 1088 VG_(strncpy)(buf, path, p-path+1); 1089 buf[p-path+1] = '\0'; 1090 1091 return buf; 1092 } 1093 1094 1095 /*--------------------------------------------------------------------*/ 1096 /*--- end ---*/ 1097 /*--------------------------------------------------------------------*/ 1098
