1// Copyright 2009 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// Linux system calls. 6// This file is compiled as ordinary Go code, 7// but it is also input to mksyscall, 8// which parses the //sys lines and generates system call stubs. 9// Note that sometimes we use a lowercase //sys name and 10// wrap it in our own nicer implementation. 11 12package unix 13 14import ( 15 "syscall" 16 "unsafe" 17) 18 19/* 20 * Wrapped 21 */ 22 23func Access(path string, mode uint32) (err error) { 24 return Faccessat(AT_FDCWD, path, mode, 0) 25} 26 27func Chmod(path string, mode uint32) (err error) { 28 return Fchmodat(AT_FDCWD, path, mode, 0) 29} 30 31func Chown(path string, uid int, gid int) (err error) { 32 return Fchownat(AT_FDCWD, path, uid, gid, 0) 33} 34 35func Creat(path string, mode uint32) (fd int, err error) { 36 return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode) 37} 38 39//sys fchmodat(dirfd int, path string, mode uint32) (err error) 40 41func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) { 42 // Linux fchmodat doesn't support the flags parameter. Mimick glibc's behavior 43 // and check the flags. Otherwise the mode would be applied to the symlink 44 // destination which is not what the user expects. 45 if flags&^AT_SYMLINK_NOFOLLOW != 0 { 46 return EINVAL 47 } else if flags&AT_SYMLINK_NOFOLLOW != 0 { 48 return EOPNOTSUPP 49 } 50 return fchmodat(dirfd, path, mode) 51} 52 53//sys ioctl(fd int, req uint, arg uintptr) (err error) 54 55// ioctl itself should not be exposed directly, but additional get/set 56// functions for specific types are permissible. 57 58// IoctlSetInt performs an ioctl operation which sets an integer value 59// on fd, using the specified request number. 60func IoctlSetInt(fd int, req uint, value int) error { 61 return ioctl(fd, req, uintptr(value)) 62} 63 64func ioctlSetWinsize(fd int, req uint, value *Winsize) error { 65 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 66} 67 68func ioctlSetTermios(fd int, req uint, value *Termios) error { 69 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 70} 71 72// IoctlGetInt performs an ioctl operation which gets an integer value 73// from fd, using the specified request number. 74func IoctlGetInt(fd int, req uint) (int, error) { 75 var value int 76 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 77 return value, err 78} 79 80func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { 81 var value Winsize 82 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 83 return &value, err 84} 85 86func IoctlGetTermios(fd int, req uint) (*Termios, error) { 87 var value Termios 88 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 89 return &value, err 90} 91 92//sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) 93 94func Link(oldpath string, newpath string) (err error) { 95 return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0) 96} 97 98func Mkdir(path string, mode uint32) (err error) { 99 return Mkdirat(AT_FDCWD, path, mode) 100} 101 102func Mknod(path string, mode uint32, dev int) (err error) { 103 return Mknodat(AT_FDCWD, path, mode, dev) 104} 105 106func Open(path string, mode int, perm uint32) (fd int, err error) { 107 return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm) 108} 109 110//sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) 111 112func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) { 113 return openat(dirfd, path, flags|O_LARGEFILE, mode) 114} 115 116//sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error) 117 118func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) { 119 if len(fds) == 0 { 120 return ppoll(nil, 0, timeout, sigmask) 121 } 122 return ppoll(&fds[0], len(fds), timeout, sigmask) 123} 124 125//sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 126 127func Readlink(path string, buf []byte) (n int, err error) { 128 return Readlinkat(AT_FDCWD, path, buf) 129} 130 131func Rename(oldpath string, newpath string) (err error) { 132 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath) 133} 134 135func Rmdir(path string) error { 136 return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR) 137} 138 139//sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 140 141func Symlink(oldpath string, newpath string) (err error) { 142 return Symlinkat(oldpath, AT_FDCWD, newpath) 143} 144 145func Unlink(path string) error { 146 return Unlinkat(AT_FDCWD, path, 0) 147} 148 149//sys Unlinkat(dirfd int, path string, flags int) (err error) 150 151func Utimes(path string, tv []Timeval) error { 152 if tv == nil { 153 err := utimensat(AT_FDCWD, path, nil, 0) 154 if err != ENOSYS { 155 return err 156 } 157 return utimes(path, nil) 158 } 159 if len(tv) != 2 { 160 return EINVAL 161 } 162 var ts [2]Timespec 163 ts[0] = NsecToTimespec(TimevalToNsec(tv[0])) 164 ts[1] = NsecToTimespec(TimevalToNsec(tv[1])) 165 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 166 if err != ENOSYS { 167 return err 168 } 169 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 170} 171 172//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) 173 174func UtimesNano(path string, ts []Timespec) error { 175 if ts == nil { 176 err := utimensat(AT_FDCWD, path, nil, 0) 177 if err != ENOSYS { 178 return err 179 } 180 return utimes(path, nil) 181 } 182 if len(ts) != 2 { 183 return EINVAL 184 } 185 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 186 if err != ENOSYS { 187 return err 188 } 189 // If the utimensat syscall isn't available (utimensat was added to Linux 190 // in 2.6.22, Released, 8 July 2007) then fall back to utimes 191 var tv [2]Timeval 192 for i := 0; i < 2; i++ { 193 tv[i] = NsecToTimeval(TimespecToNsec(ts[i])) 194 } 195 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 196} 197 198func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error { 199 if ts == nil { 200 return utimensat(dirfd, path, nil, flags) 201 } 202 if len(ts) != 2 { 203 return EINVAL 204 } 205 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags) 206} 207 208func Futimesat(dirfd int, path string, tv []Timeval) error { 209 if tv == nil { 210 return futimesat(dirfd, path, nil) 211 } 212 if len(tv) != 2 { 213 return EINVAL 214 } 215 return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 216} 217 218func Futimes(fd int, tv []Timeval) (err error) { 219 // Believe it or not, this is the best we can do on Linux 220 // (and is what glibc does). 221 return Utimes("/proc/self/fd/"+itoa(fd), tv) 222} 223 224const ImplementsGetwd = true 225 226//sys Getcwd(buf []byte) (n int, err error) 227 228func Getwd() (wd string, err error) { 229 var buf [PathMax]byte 230 n, err := Getcwd(buf[0:]) 231 if err != nil { 232 return "", err 233 } 234 // Getcwd returns the number of bytes written to buf, including the NUL. 235 if n < 1 || n > len(buf) || buf[n-1] != 0 { 236 return "", EINVAL 237 } 238 return string(buf[0 : n-1]), nil 239} 240 241func Getgroups() (gids []int, err error) { 242 n, err := getgroups(0, nil) 243 if err != nil { 244 return nil, err 245 } 246 if n == 0 { 247 return nil, nil 248 } 249 250 // Sanity check group count. Max is 1<<16 on Linux. 251 if n < 0 || n > 1<<20 { 252 return nil, EINVAL 253 } 254 255 a := make([]_Gid_t, n) 256 n, err = getgroups(n, &a[0]) 257 if err != nil { 258 return nil, err 259 } 260 gids = make([]int, n) 261 for i, v := range a[0:n] { 262 gids[i] = int(v) 263 } 264 return 265} 266 267func Setgroups(gids []int) (err error) { 268 if len(gids) == 0 { 269 return setgroups(0, nil) 270 } 271 272 a := make([]_Gid_t, len(gids)) 273 for i, v := range gids { 274 a[i] = _Gid_t(v) 275 } 276 return setgroups(len(a), &a[0]) 277} 278 279type WaitStatus uint32 280 281// Wait status is 7 bits at bottom, either 0 (exited), 282// 0x7F (stopped), or a signal number that caused an exit. 283// The 0x80 bit is whether there was a core dump. 284// An extra number (exit code, signal causing a stop) 285// is in the high bits. At least that's the idea. 286// There are various irregularities. For example, the 287// "continued" status is 0xFFFF, distinguishing itself 288// from stopped via the core dump bit. 289 290const ( 291 mask = 0x7F 292 core = 0x80 293 exited = 0x00 294 stopped = 0x7F 295 shift = 8 296) 297 298func (w WaitStatus) Exited() bool { return w&mask == exited } 299 300func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited } 301 302func (w WaitStatus) Stopped() bool { return w&0xFF == stopped } 303 304func (w WaitStatus) Continued() bool { return w == 0xFFFF } 305 306func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 } 307 308func (w WaitStatus) ExitStatus() int { 309 if !w.Exited() { 310 return -1 311 } 312 return int(w>>shift) & 0xFF 313} 314 315func (w WaitStatus) Signal() syscall.Signal { 316 if !w.Signaled() { 317 return -1 318 } 319 return syscall.Signal(w & mask) 320} 321 322func (w WaitStatus) StopSignal() syscall.Signal { 323 if !w.Stopped() { 324 return -1 325 } 326 return syscall.Signal(w>>shift) & 0xFF 327} 328 329func (w WaitStatus) TrapCause() int { 330 if w.StopSignal() != SIGTRAP { 331 return -1 332 } 333 return int(w>>shift) >> 8 334} 335 336//sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error) 337 338func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) { 339 var status _C_int 340 wpid, err = wait4(pid, &status, options, rusage) 341 if wstatus != nil { 342 *wstatus = WaitStatus(status) 343 } 344 return 345} 346 347func Mkfifo(path string, mode uint32) error { 348 return Mknod(path, mode|S_IFIFO, 0) 349} 350 351func Mkfifoat(dirfd int, path string, mode uint32) error { 352 return Mknodat(dirfd, path, mode|S_IFIFO, 0) 353} 354 355func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) { 356 if sa.Port < 0 || sa.Port > 0xFFFF { 357 return nil, 0, EINVAL 358 } 359 sa.raw.Family = AF_INET 360 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 361 p[0] = byte(sa.Port >> 8) 362 p[1] = byte(sa.Port) 363 for i := 0; i < len(sa.Addr); i++ { 364 sa.raw.Addr[i] = sa.Addr[i] 365 } 366 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil 367} 368 369func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) { 370 if sa.Port < 0 || sa.Port > 0xFFFF { 371 return nil, 0, EINVAL 372 } 373 sa.raw.Family = AF_INET6 374 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 375 p[0] = byte(sa.Port >> 8) 376 p[1] = byte(sa.Port) 377 sa.raw.Scope_id = sa.ZoneId 378 for i := 0; i < len(sa.Addr); i++ { 379 sa.raw.Addr[i] = sa.Addr[i] 380 } 381 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil 382} 383 384func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) { 385 name := sa.Name 386 n := len(name) 387 if n >= len(sa.raw.Path) { 388 return nil, 0, EINVAL 389 } 390 sa.raw.Family = AF_UNIX 391 for i := 0; i < n; i++ { 392 sa.raw.Path[i] = int8(name[i]) 393 } 394 // length is family (uint16), name, NUL. 395 sl := _Socklen(2) 396 if n > 0 { 397 sl += _Socklen(n) + 1 398 } 399 if sa.raw.Path[0] == '@' { 400 sa.raw.Path[0] = 0 401 // Don't count trailing NUL for abstract address. 402 sl-- 403 } 404 405 return unsafe.Pointer(&sa.raw), sl, nil 406} 407 408// SockaddrLinklayer implements the Sockaddr interface for AF_PACKET type sockets. 409type SockaddrLinklayer struct { 410 Protocol uint16 411 Ifindex int 412 Hatype uint16 413 Pkttype uint8 414 Halen uint8 415 Addr [8]byte 416 raw RawSockaddrLinklayer 417} 418 419func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) { 420 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 421 return nil, 0, EINVAL 422 } 423 sa.raw.Family = AF_PACKET 424 sa.raw.Protocol = sa.Protocol 425 sa.raw.Ifindex = int32(sa.Ifindex) 426 sa.raw.Hatype = sa.Hatype 427 sa.raw.Pkttype = sa.Pkttype 428 sa.raw.Halen = sa.Halen 429 for i := 0; i < len(sa.Addr); i++ { 430 sa.raw.Addr[i] = sa.Addr[i] 431 } 432 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil 433} 434 435// SockaddrNetlink implements the Sockaddr interface for AF_NETLINK type sockets. 436type SockaddrNetlink struct { 437 Family uint16 438 Pad uint16 439 Pid uint32 440 Groups uint32 441 raw RawSockaddrNetlink 442} 443 444func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) { 445 sa.raw.Family = AF_NETLINK 446 sa.raw.Pad = sa.Pad 447 sa.raw.Pid = sa.Pid 448 sa.raw.Groups = sa.Groups 449 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil 450} 451 452// SockaddrHCI implements the Sockaddr interface for AF_BLUETOOTH type sockets 453// using the HCI protocol. 454type SockaddrHCI struct { 455 Dev uint16 456 Channel uint16 457 raw RawSockaddrHCI 458} 459 460func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) { 461 sa.raw.Family = AF_BLUETOOTH 462 sa.raw.Dev = sa.Dev 463 sa.raw.Channel = sa.Channel 464 return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil 465} 466 467// SockaddrL2 implements the Sockaddr interface for AF_BLUETOOTH type sockets 468// using the L2CAP protocol. 469type SockaddrL2 struct { 470 PSM uint16 471 CID uint16 472 Addr [6]uint8 473 AddrType uint8 474 raw RawSockaddrL2 475} 476 477func (sa *SockaddrL2) sockaddr() (unsafe.Pointer, _Socklen, error) { 478 sa.raw.Family = AF_BLUETOOTH 479 psm := (*[2]byte)(unsafe.Pointer(&sa.raw.Psm)) 480 psm[0] = byte(sa.PSM) 481 psm[1] = byte(sa.PSM >> 8) 482 for i := 0; i < len(sa.Addr); i++ { 483 sa.raw.Bdaddr[i] = sa.Addr[len(sa.Addr)-1-i] 484 } 485 cid := (*[2]byte)(unsafe.Pointer(&sa.raw.Cid)) 486 cid[0] = byte(sa.CID) 487 cid[1] = byte(sa.CID >> 8) 488 sa.raw.Bdaddr_type = sa.AddrType 489 return unsafe.Pointer(&sa.raw), SizeofSockaddrL2, nil 490} 491 492// SockaddrRFCOMM implements the Sockaddr interface for AF_BLUETOOTH type sockets 493// using the RFCOMM protocol. 494// 495// Server example: 496// 497// fd, _ := Socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM) 498// _ = unix.Bind(fd, &unix.SockaddrRFCOMM{ 499// Channel: 1, 500// Addr: [6]uint8{0, 0, 0, 0, 0, 0}, // BDADDR_ANY or 00:00:00:00:00:00 501// }) 502// _ = Listen(fd, 1) 503// nfd, sa, _ := Accept(fd) 504// fmt.Printf("conn addr=%v fd=%d", sa.(*unix.SockaddrRFCOMM).Addr, nfd) 505// Read(nfd, buf) 506// 507// Client example: 508// 509// fd, _ := Socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM) 510// _ = Connect(fd, &SockaddrRFCOMM{ 511// Channel: 1, 512// Addr: [6]byte{0x11, 0x22, 0x33, 0xaa, 0xbb, 0xcc}, // CC:BB:AA:33:22:11 513// }) 514// Write(fd, []byte(`hello`)) 515type SockaddrRFCOMM struct { 516 // Addr represents a bluetooth address, byte ordering is little-endian. 517 Addr [6]uint8 518 519 // Channel is a designated bluetooth channel, only 1-30 are available for use. 520 // Since Linux 2.6.7 and further zero value is the first available channel. 521 Channel uint8 522 523 raw RawSockaddrRFCOMM 524} 525 526func (sa *SockaddrRFCOMM) sockaddr() (unsafe.Pointer, _Socklen, error) { 527 sa.raw.Family = AF_BLUETOOTH 528 sa.raw.Channel = sa.Channel 529 sa.raw.Bdaddr = sa.Addr 530 return unsafe.Pointer(&sa.raw), SizeofSockaddrRFCOMM, nil 531} 532 533// SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets. 534// The RxID and TxID fields are used for transport protocol addressing in 535// (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with 536// zero values for CAN_RAW and CAN_BCM sockets as they have no meaning. 537// 538// The SockaddrCAN struct must be bound to the socket file descriptor 539// using Bind before the CAN socket can be used. 540// 541// // Read one raw CAN frame 542// fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW) 543// addr := &SockaddrCAN{Ifindex: index} 544// Bind(fd, addr) 545// frame := make([]byte, 16) 546// Read(fd, frame) 547// 548// The full SocketCAN documentation can be found in the linux kernel 549// archives at: https://www.kernel.org/doc/Documentation/networking/can.txt 550type SockaddrCAN struct { 551 Ifindex int 552 RxID uint32 553 TxID uint32 554 raw RawSockaddrCAN 555} 556 557func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) { 558 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 559 return nil, 0, EINVAL 560 } 561 sa.raw.Family = AF_CAN 562 sa.raw.Ifindex = int32(sa.Ifindex) 563 rx := (*[4]byte)(unsafe.Pointer(&sa.RxID)) 564 for i := 0; i < 4; i++ { 565 sa.raw.Addr[i] = rx[i] 566 } 567 tx := (*[4]byte)(unsafe.Pointer(&sa.TxID)) 568 for i := 0; i < 4; i++ { 569 sa.raw.Addr[i+4] = tx[i] 570 } 571 return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil 572} 573 574// SockaddrALG implements the Sockaddr interface for AF_ALG type sockets. 575// SockaddrALG enables userspace access to the Linux kernel's cryptography 576// subsystem. The Type and Name fields specify which type of hash or cipher 577// should be used with a given socket. 578// 579// To create a file descriptor that provides access to a hash or cipher, both 580// Bind and Accept must be used. Once the setup process is complete, input 581// data can be written to the socket, processed by the kernel, and then read 582// back as hash output or ciphertext. 583// 584// Here is an example of using an AF_ALG socket with SHA1 hashing. 585// The initial socket setup process is as follows: 586// 587// // Open a socket to perform SHA1 hashing. 588// fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0) 589// addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"} 590// unix.Bind(fd, addr) 591// // Note: unix.Accept does not work at this time; must invoke accept() 592// // manually using unix.Syscall. 593// hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0) 594// 595// Once a file descriptor has been returned from Accept, it may be used to 596// perform SHA1 hashing. The descriptor is not safe for concurrent use, but 597// may be re-used repeatedly with subsequent Write and Read operations. 598// 599// When hashing a small byte slice or string, a single Write and Read may 600// be used: 601// 602// // Assume hashfd is already configured using the setup process. 603// hash := os.NewFile(hashfd, "sha1") 604// // Hash an input string and read the results. Each Write discards 605// // previous hash state. Read always reads the current state. 606// b := make([]byte, 20) 607// for i := 0; i < 2; i++ { 608// io.WriteString(hash, "Hello, world.") 609// hash.Read(b) 610// fmt.Println(hex.EncodeToString(b)) 611// } 612// // Output: 613// // 2ae01472317d1935a84797ec1983ae243fc6aa28 614// // 2ae01472317d1935a84797ec1983ae243fc6aa28 615// 616// For hashing larger byte slices, or byte streams such as those read from 617// a file or socket, use Sendto with MSG_MORE to instruct the kernel to update 618// the hash digest instead of creating a new one for a given chunk and finalizing it. 619// 620// // Assume hashfd and addr are already configured using the setup process. 621// hash := os.NewFile(hashfd, "sha1") 622// // Hash the contents of a file. 623// f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz") 624// b := make([]byte, 4096) 625// for { 626// n, err := f.Read(b) 627// if err == io.EOF { 628// break 629// } 630// unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr) 631// } 632// hash.Read(b) 633// fmt.Println(hex.EncodeToString(b)) 634// // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5 635// 636// For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html. 637type SockaddrALG struct { 638 Type string 639 Name string 640 Feature uint32 641 Mask uint32 642 raw RawSockaddrALG 643} 644 645func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) { 646 // Leave room for NUL byte terminator. 647 if len(sa.Type) > 13 { 648 return nil, 0, EINVAL 649 } 650 if len(sa.Name) > 63 { 651 return nil, 0, EINVAL 652 } 653 654 sa.raw.Family = AF_ALG 655 sa.raw.Feat = sa.Feature 656 sa.raw.Mask = sa.Mask 657 658 typ, err := ByteSliceFromString(sa.Type) 659 if err != nil { 660 return nil, 0, err 661 } 662 name, err := ByteSliceFromString(sa.Name) 663 if err != nil { 664 return nil, 0, err 665 } 666 667 copy(sa.raw.Type[:], typ) 668 copy(sa.raw.Name[:], name) 669 670 return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil 671} 672 673// SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets. 674// SockaddrVM provides access to Linux VM sockets: a mechanism that enables 675// bidirectional communication between a hypervisor and its guest virtual 676// machines. 677type SockaddrVM struct { 678 // CID and Port specify a context ID and port address for a VM socket. 679 // Guests have a unique CID, and hosts may have a well-known CID of: 680 // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process. 681 // - VMADDR_CID_HOST: refers to other processes on the host. 682 CID uint32 683 Port uint32 684 raw RawSockaddrVM 685} 686 687func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { 688 sa.raw.Family = AF_VSOCK 689 sa.raw.Port = sa.Port 690 sa.raw.Cid = sa.CID 691 692 return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil 693} 694 695func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { 696 switch rsa.Addr.Family { 697 case AF_NETLINK: 698 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa)) 699 sa := new(SockaddrNetlink) 700 sa.Family = pp.Family 701 sa.Pad = pp.Pad 702 sa.Pid = pp.Pid 703 sa.Groups = pp.Groups 704 return sa, nil 705 706 case AF_PACKET: 707 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa)) 708 sa := new(SockaddrLinklayer) 709 sa.Protocol = pp.Protocol 710 sa.Ifindex = int(pp.Ifindex) 711 sa.Hatype = pp.Hatype 712 sa.Pkttype = pp.Pkttype 713 sa.Halen = pp.Halen 714 for i := 0; i < len(sa.Addr); i++ { 715 sa.Addr[i] = pp.Addr[i] 716 } 717 return sa, nil 718 719 case AF_UNIX: 720 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa)) 721 sa := new(SockaddrUnix) 722 if pp.Path[0] == 0 { 723 // "Abstract" Unix domain socket. 724 // Rewrite leading NUL as @ for textual display. 725 // (This is the standard convention.) 726 // Not friendly to overwrite in place, 727 // but the callers below don't care. 728 pp.Path[0] = '@' 729 } 730 731 // Assume path ends at NUL. 732 // This is not technically the Linux semantics for 733 // abstract Unix domain sockets--they are supposed 734 // to be uninterpreted fixed-size binary blobs--but 735 // everyone uses this convention. 736 n := 0 737 for n < len(pp.Path) && pp.Path[n] != 0 { 738 n++ 739 } 740 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] 741 sa.Name = string(bytes) 742 return sa, nil 743 744 case AF_INET: 745 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 746 sa := new(SockaddrInet4) 747 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 748 sa.Port = int(p[0])<<8 + int(p[1]) 749 for i := 0; i < len(sa.Addr); i++ { 750 sa.Addr[i] = pp.Addr[i] 751 } 752 return sa, nil 753 754 case AF_INET6: 755 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 756 sa := new(SockaddrInet6) 757 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 758 sa.Port = int(p[0])<<8 + int(p[1]) 759 sa.ZoneId = pp.Scope_id 760 for i := 0; i < len(sa.Addr); i++ { 761 sa.Addr[i] = pp.Addr[i] 762 } 763 return sa, nil 764 765 case AF_VSOCK: 766 pp := (*RawSockaddrVM)(unsafe.Pointer(rsa)) 767 sa := &SockaddrVM{ 768 CID: pp.Cid, 769 Port: pp.Port, 770 } 771 return sa, nil 772 case AF_BLUETOOTH: 773 proto, err := GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL) 774 if err != nil { 775 return nil, err 776 } 777 // only BTPROTO_L2CAP and BTPROTO_RFCOMM can accept connections 778 switch proto { 779 case BTPROTO_L2CAP: 780 pp := (*RawSockaddrL2)(unsafe.Pointer(rsa)) 781 sa := &SockaddrL2{ 782 PSM: pp.Psm, 783 CID: pp.Cid, 784 Addr: pp.Bdaddr, 785 AddrType: pp.Bdaddr_type, 786 } 787 return sa, nil 788 case BTPROTO_RFCOMM: 789 pp := (*RawSockaddrRFCOMM)(unsafe.Pointer(rsa)) 790 sa := &SockaddrRFCOMM{ 791 Channel: pp.Channel, 792 Addr: pp.Bdaddr, 793 } 794 return sa, nil 795 } 796 } 797 return nil, EAFNOSUPPORT 798} 799 800func Accept(fd int) (nfd int, sa Sockaddr, err error) { 801 var rsa RawSockaddrAny 802 var len _Socklen = SizeofSockaddrAny 803 nfd, err = accept(fd, &rsa, &len) 804 if err != nil { 805 return 806 } 807 sa, err = anyToSockaddr(fd, &rsa) 808 if err != nil { 809 Close(nfd) 810 nfd = 0 811 } 812 return 813} 814 815func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) { 816 var rsa RawSockaddrAny 817 var len _Socklen = SizeofSockaddrAny 818 nfd, err = accept4(fd, &rsa, &len, flags) 819 if err != nil { 820 return 821 } 822 if len > SizeofSockaddrAny { 823 panic("RawSockaddrAny too small") 824 } 825 sa, err = anyToSockaddr(fd, &rsa) 826 if err != nil { 827 Close(nfd) 828 nfd = 0 829 } 830 return 831} 832 833func Getsockname(fd int) (sa Sockaddr, err error) { 834 var rsa RawSockaddrAny 835 var len _Socklen = SizeofSockaddrAny 836 if err = getsockname(fd, &rsa, &len); err != nil { 837 return 838 } 839 return anyToSockaddr(fd, &rsa) 840} 841 842func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 843 var value IPMreqn 844 vallen := _Socklen(SizeofIPMreqn) 845 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 846 return &value, err 847} 848 849func GetsockoptUcred(fd, level, opt int) (*Ucred, error) { 850 var value Ucred 851 vallen := _Socklen(SizeofUcred) 852 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 853 return &value, err 854} 855 856func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) { 857 var value TCPInfo 858 vallen := _Socklen(SizeofTCPInfo) 859 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 860 return &value, err 861} 862 863// GetsockoptString returns the string value of the socket option opt for the 864// socket associated with fd at the given socket level. 865func GetsockoptString(fd, level, opt int) (string, error) { 866 buf := make([]byte, 256) 867 vallen := _Socklen(len(buf)) 868 err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen) 869 if err != nil { 870 if err == ERANGE { 871 buf = make([]byte, vallen) 872 err = getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen) 873 } 874 if err != nil { 875 return "", err 876 } 877 } 878 return string(buf[:vallen-1]), nil 879} 880 881func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 882 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 883} 884 885// Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html) 886 887// KeyctlInt calls keyctl commands in which each argument is an int. 888// These commands are KEYCTL_REVOKE, KEYCTL_CHOWN, KEYCTL_CLEAR, KEYCTL_LINK, 889// KEYCTL_UNLINK, KEYCTL_NEGATE, KEYCTL_SET_REQKEY_KEYRING, KEYCTL_SET_TIMEOUT, 890// KEYCTL_ASSUME_AUTHORITY, KEYCTL_SESSION_TO_PARENT, KEYCTL_REJECT, 891// KEYCTL_INVALIDATE, and KEYCTL_GET_PERSISTENT. 892//sys KeyctlInt(cmd int, arg2 int, arg3 int, arg4 int, arg5 int) (ret int, err error) = SYS_KEYCTL 893 894// KeyctlBuffer calls keyctl commands in which the third and fourth 895// arguments are a buffer and its length, respectively. 896// These commands are KEYCTL_UPDATE, KEYCTL_READ, and KEYCTL_INSTANTIATE. 897//sys KeyctlBuffer(cmd int, arg2 int, buf []byte, arg5 int) (ret int, err error) = SYS_KEYCTL 898 899// KeyctlString calls keyctl commands which return a string. 900// These commands are KEYCTL_DESCRIBE and KEYCTL_GET_SECURITY. 901func KeyctlString(cmd int, id int) (string, error) { 902 // We must loop as the string data may change in between the syscalls. 903 // We could allocate a large buffer here to reduce the chance that the 904 // syscall needs to be called twice; however, this is unnecessary as 905 // the performance loss is negligible. 906 var buffer []byte 907 for { 908 // Try to fill the buffer with data 909 length, err := KeyctlBuffer(cmd, id, buffer, 0) 910 if err != nil { 911 return "", err 912 } 913 914 // Check if the data was written 915 if length <= len(buffer) { 916 // Exclude the null terminator 917 return string(buffer[:length-1]), nil 918 } 919 920 // Make a bigger buffer if needed 921 buffer = make([]byte, length) 922 } 923} 924 925// Keyctl commands with special signatures. 926 927// KeyctlGetKeyringID implements the KEYCTL_GET_KEYRING_ID command. 928// See the full documentation at: 929// http://man7.org/linux/man-pages/man3/keyctl_get_keyring_ID.3.html 930func KeyctlGetKeyringID(id int, create bool) (ringid int, err error) { 931 createInt := 0 932 if create { 933 createInt = 1 934 } 935 return KeyctlInt(KEYCTL_GET_KEYRING_ID, id, createInt, 0, 0) 936} 937 938// KeyctlSetperm implements the KEYCTL_SETPERM command. The perm value is the 939// key handle permission mask as described in the "keyctl setperm" section of 940// http://man7.org/linux/man-pages/man1/keyctl.1.html. 941// See the full documentation at: 942// http://man7.org/linux/man-pages/man3/keyctl_setperm.3.html 943func KeyctlSetperm(id int, perm uint32) error { 944 _, err := KeyctlInt(KEYCTL_SETPERM, id, int(perm), 0, 0) 945 return err 946} 947 948//sys keyctlJoin(cmd int, arg2 string) (ret int, err error) = SYS_KEYCTL 949 950// KeyctlJoinSessionKeyring implements the KEYCTL_JOIN_SESSION_KEYRING command. 951// See the full documentation at: 952// http://man7.org/linux/man-pages/man3/keyctl_join_session_keyring.3.html 953func KeyctlJoinSessionKeyring(name string) (ringid int, err error) { 954 return keyctlJoin(KEYCTL_JOIN_SESSION_KEYRING, name) 955} 956 957//sys keyctlSearch(cmd int, arg2 int, arg3 string, arg4 string, arg5 int) (ret int, err error) = SYS_KEYCTL 958 959// KeyctlSearch implements the KEYCTL_SEARCH command. 960// See the full documentation at: 961// http://man7.org/linux/man-pages/man3/keyctl_search.3.html 962func KeyctlSearch(ringid int, keyType, description string, destRingid int) (id int, err error) { 963 return keyctlSearch(KEYCTL_SEARCH, ringid, keyType, description, destRingid) 964} 965 966//sys keyctlIOV(cmd int, arg2 int, payload []Iovec, arg5 int) (err error) = SYS_KEYCTL 967 968// KeyctlInstantiateIOV implements the KEYCTL_INSTANTIATE_IOV command. This 969// command is similar to KEYCTL_INSTANTIATE, except that the payload is a slice 970// of Iovec (each of which represents a buffer) instead of a single buffer. 971// See the full documentation at: 972// http://man7.org/linux/man-pages/man3/keyctl_instantiate_iov.3.html 973func KeyctlInstantiateIOV(id int, payload []Iovec, ringid int) error { 974 return keyctlIOV(KEYCTL_INSTANTIATE_IOV, id, payload, ringid) 975} 976 977//sys keyctlDH(cmd int, arg2 *KeyctlDHParams, buf []byte) (ret int, err error) = SYS_KEYCTL 978 979// KeyctlDHCompute implements the KEYCTL_DH_COMPUTE command. This command 980// computes a Diffie-Hellman shared secret based on the provide params. The 981// secret is written to the provided buffer and the returned size is the number 982// of bytes written (returning an error if there is insufficient space in the 983// buffer). If a nil buffer is passed in, this function returns the minimum 984// buffer length needed to store the appropriate data. Note that this differs 985// from KEYCTL_READ's behavior which always returns the requested payload size. 986// See the full documentation at: 987// http://man7.org/linux/man-pages/man3/keyctl_dh_compute.3.html 988func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error) { 989 return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer) 990} 991 992func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { 993 var msg Msghdr 994 var rsa RawSockaddrAny 995 msg.Name = (*byte)(unsafe.Pointer(&rsa)) 996 msg.Namelen = uint32(SizeofSockaddrAny) 997 var iov Iovec 998 if len(p) > 0 { 999 iov.Base = &p[0] 1000 iov.SetLen(len(p)) 1001 } 1002 var dummy byte 1003 if len(oob) > 0 { 1004 if len(p) == 0 { 1005 var sockType int 1006 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 1007 if err != nil { 1008 return 1009 } 1010 // receive at least one normal byte 1011 if sockType != SOCK_DGRAM { 1012 iov.Base = &dummy 1013 iov.SetLen(1) 1014 } 1015 } 1016 msg.Control = &oob[0] 1017 msg.SetControllen(len(oob)) 1018 } 1019 msg.Iov = &iov 1020 msg.Iovlen = 1 1021 if n, err = recvmsg(fd, &msg, flags); err != nil { 1022 return 1023 } 1024 oobn = int(msg.Controllen) 1025 recvflags = int(msg.Flags) 1026 // source address is only specified if the socket is unconnected 1027 if rsa.Addr.Family != AF_UNSPEC { 1028 from, err = anyToSockaddr(fd, &rsa) 1029 } 1030 return 1031} 1032 1033func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { 1034 _, err = SendmsgN(fd, p, oob, to, flags) 1035 return 1036} 1037 1038func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { 1039 var ptr unsafe.Pointer 1040 var salen _Socklen 1041 if to != nil { 1042 var err error 1043 ptr, salen, err = to.sockaddr() 1044 if err != nil { 1045 return 0, err 1046 } 1047 } 1048 var msg Msghdr 1049 msg.Name = (*byte)(ptr) 1050 msg.Namelen = uint32(salen) 1051 var iov Iovec 1052 if len(p) > 0 { 1053 iov.Base = &p[0] 1054 iov.SetLen(len(p)) 1055 } 1056 var dummy byte 1057 if len(oob) > 0 { 1058 if len(p) == 0 { 1059 var sockType int 1060 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 1061 if err != nil { 1062 return 0, err 1063 } 1064 // send at least one normal byte 1065 if sockType != SOCK_DGRAM { 1066 iov.Base = &dummy 1067 iov.SetLen(1) 1068 } 1069 } 1070 msg.Control = &oob[0] 1071 msg.SetControllen(len(oob)) 1072 } 1073 msg.Iov = &iov 1074 msg.Iovlen = 1 1075 if n, err = sendmsg(fd, &msg, flags); err != nil { 1076 return 0, err 1077 } 1078 if len(oob) > 0 && len(p) == 0 { 1079 n = 0 1080 } 1081 return n, nil 1082} 1083 1084// BindToDevice binds the socket associated with fd to device. 1085func BindToDevice(fd int, device string) (err error) { 1086 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device) 1087} 1088 1089//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 1090 1091func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) { 1092 // The peek requests are machine-size oriented, so we wrap it 1093 // to retrieve arbitrary-length data. 1094 1095 // The ptrace syscall differs from glibc's ptrace. 1096 // Peeks returns the word in *data, not as the return value. 1097 1098 var buf [sizeofPtr]byte 1099 1100 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned 1101 // access (PEEKUSER warns that it might), but if we don't 1102 // align our reads, we might straddle an unmapped page 1103 // boundary and not get the bytes leading up to the page 1104 // boundary. 1105 n := 0 1106 if addr%sizeofPtr != 0 { 1107 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1108 if err != nil { 1109 return 0, err 1110 } 1111 n += copy(out, buf[addr%sizeofPtr:]) 1112 out = out[n:] 1113 } 1114 1115 // Remainder. 1116 for len(out) > 0 { 1117 // We use an internal buffer to guarantee alignment. 1118 // It's not documented if this is necessary, but we're paranoid. 1119 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1120 if err != nil { 1121 return n, err 1122 } 1123 copied := copy(out, buf[0:]) 1124 n += copied 1125 out = out[copied:] 1126 } 1127 1128 return n, nil 1129} 1130 1131func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) { 1132 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out) 1133} 1134 1135func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) { 1136 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out) 1137} 1138 1139func PtracePeekUser(pid int, addr uintptr, out []byte) (count int, err error) { 1140 return ptracePeek(PTRACE_PEEKUSR, pid, addr, out) 1141} 1142 1143func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) { 1144 // As for ptracePeek, we need to align our accesses to deal 1145 // with the possibility of straddling an invalid page. 1146 1147 // Leading edge. 1148 n := 0 1149 if addr%sizeofPtr != 0 { 1150 var buf [sizeofPtr]byte 1151 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1152 if err != nil { 1153 return 0, err 1154 } 1155 n += copy(buf[addr%sizeofPtr:], data) 1156 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1157 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word) 1158 if err != nil { 1159 return 0, err 1160 } 1161 data = data[n:] 1162 } 1163 1164 // Interior. 1165 for len(data) > sizeofPtr { 1166 word := *((*uintptr)(unsafe.Pointer(&data[0]))) 1167 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1168 if err != nil { 1169 return n, err 1170 } 1171 n += sizeofPtr 1172 data = data[sizeofPtr:] 1173 } 1174 1175 // Trailing edge. 1176 if len(data) > 0 { 1177 var buf [sizeofPtr]byte 1178 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1179 if err != nil { 1180 return n, err 1181 } 1182 copy(buf[0:], data) 1183 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1184 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1185 if err != nil { 1186 return n, err 1187 } 1188 n += len(data) 1189 } 1190 1191 return n, nil 1192} 1193 1194func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) { 1195 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data) 1196} 1197 1198func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) { 1199 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data) 1200} 1201 1202func PtracePokeUser(pid int, addr uintptr, data []byte) (count int, err error) { 1203 return ptracePoke(PTRACE_POKEUSR, PTRACE_PEEKUSR, pid, addr, data) 1204} 1205 1206func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) { 1207 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout))) 1208} 1209 1210func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) { 1211 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs))) 1212} 1213 1214func PtraceSetOptions(pid int, options int) (err error) { 1215 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options)) 1216} 1217 1218func PtraceGetEventMsg(pid int) (msg uint, err error) { 1219 var data _C_long 1220 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data))) 1221 msg = uint(data) 1222 return 1223} 1224 1225func PtraceCont(pid int, signal int) (err error) { 1226 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal)) 1227} 1228 1229func PtraceSyscall(pid int, signal int) (err error) { 1230 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal)) 1231} 1232 1233func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) } 1234 1235func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) } 1236 1237func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) } 1238 1239//sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error) 1240 1241func Reboot(cmd int) (err error) { 1242 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "") 1243} 1244 1245func ReadDirent(fd int, buf []byte) (n int, err error) { 1246 return Getdents(fd, buf) 1247} 1248 1249//sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error) 1250 1251func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) { 1252 // Certain file systems get rather angry and EINVAL if you give 1253 // them an empty string of data, rather than NULL. 1254 if data == "" { 1255 return mount(source, target, fstype, flags, nil) 1256 } 1257 datap, err := BytePtrFromString(data) 1258 if err != nil { 1259 return err 1260 } 1261 return mount(source, target, fstype, flags, datap) 1262} 1263 1264// Sendto 1265// Recvfrom 1266// Socketpair 1267 1268/* 1269 * Direct access 1270 */ 1271//sys Acct(path string) (err error) 1272//sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error) 1273//sys Adjtimex(buf *Timex) (state int, err error) 1274//sys Chdir(path string) (err error) 1275//sys Chroot(path string) (err error) 1276//sys ClockGettime(clockid int32, time *Timespec) (err error) 1277//sys Close(fd int) (err error) 1278//sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 1279//sys Dup(oldfd int) (fd int, err error) 1280//sys Dup3(oldfd int, newfd int, flags int) (err error) 1281//sysnb EpollCreate1(flag int) (fd int, err error) 1282//sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) 1283//sys Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD2 1284//sys Exit(code int) = SYS_EXIT_GROUP 1285//sys Fallocate(fd int, mode uint32, off int64, len int64) (err error) 1286//sys Fchdir(fd int) (err error) 1287//sys Fchmod(fd int, mode uint32) (err error) 1288//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 1289//sys fcntl(fd int, cmd int, arg int) (val int, err error) 1290//sys Fdatasync(fd int) (err error) 1291//sys Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) 1292//sys Flistxattr(fd int, dest []byte) (sz int, err error) 1293//sys Flock(fd int, how int) (err error) 1294//sys Fremovexattr(fd int, attr string) (err error) 1295//sys Fsetxattr(fd int, attr string, dest []byte, flags int) (err error) 1296//sys Fsync(fd int) (err error) 1297//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64 1298//sysnb Getpgid(pid int) (pgid int, err error) 1299 1300func Getpgrp() (pid int) { 1301 pid, _ = Getpgid(0) 1302 return 1303} 1304 1305//sysnb Getpid() (pid int) 1306//sysnb Getppid() (ppid int) 1307//sys Getpriority(which int, who int) (prio int, err error) 1308//sys Getrandom(buf []byte, flags int) (n int, err error) 1309//sysnb Getrusage(who int, rusage *Rusage) (err error) 1310//sysnb Getsid(pid int) (sid int, err error) 1311//sysnb Gettid() (tid int) 1312//sys Getxattr(path string, attr string, dest []byte) (sz int, err error) 1313//sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error) 1314//sysnb InotifyInit1(flags int) (fd int, err error) 1315//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) 1316//sysnb Kill(pid int, sig syscall.Signal) (err error) 1317//sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG 1318//sys Lgetxattr(path string, attr string, dest []byte) (sz int, err error) 1319//sys Listxattr(path string, dest []byte) (sz int, err error) 1320//sys Llistxattr(path string, dest []byte) (sz int, err error) 1321//sys Lremovexattr(path string, attr string) (err error) 1322//sys Lsetxattr(path string, attr string, data []byte, flags int) (err error) 1323//sys Mkdirat(dirfd int, path string, mode uint32) (err error) 1324//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error) 1325//sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 1326//sys PerfEventOpen(attr *PerfEventAttr, pid int, cpu int, groupFd int, flags int) (fd int, err error) 1327//sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT 1328//sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 1329//sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) 1330//sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6 1331//sys read(fd int, p []byte) (n int, err error) 1332//sys Removexattr(path string, attr string) (err error) 1333//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 1334//sys Renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) 1335//sys RequestKey(keyType string, description string, callback string, destRingid int) (id int, err error) 1336//sys Setdomainname(p []byte) (err error) 1337//sys Sethostname(p []byte) (err error) 1338//sysnb Setpgid(pid int, pgid int) (err error) 1339//sysnb Setsid() (pid int, err error) 1340//sysnb Settimeofday(tv *Timeval) (err error) 1341//sys Setns(fd int, nstype int) (err error) 1342 1343// issue 1435. 1344// On linux Setuid and Setgid only affects the current thread, not the process. 1345// This does not match what most callers expect so we must return an error 1346// here rather than letting the caller think that the call succeeded. 1347 1348func Setuid(uid int) (err error) { 1349 return EOPNOTSUPP 1350} 1351 1352func Setgid(uid int) (err error) { 1353 return EOPNOTSUPP 1354} 1355 1356//sys Setpriority(which int, who int, prio int) (err error) 1357//sys Setxattr(path string, attr string, data []byte, flags int) (err error) 1358//sys Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error) 1359//sys Sync() 1360//sys Syncfs(fd int) (err error) 1361//sysnb Sysinfo(info *Sysinfo_t) (err error) 1362//sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error) 1363//sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error) 1364//sysnb Times(tms *Tms) (ticks uintptr, err error) 1365//sysnb Umask(mask int) (oldmask int) 1366//sysnb Uname(buf *Utsname) (err error) 1367//sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2 1368//sys Unshare(flags int) (err error) 1369//sys write(fd int, p []byte) (n int, err error) 1370//sys exitThread(code int) (err error) = SYS_EXIT 1371//sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ 1372//sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE 1373 1374// mmap varies by architecture; see syscall_linux_*.go. 1375//sys munmap(addr uintptr, length uintptr) (err error) 1376 1377var mapper = &mmapper{ 1378 active: make(map[*byte][]byte), 1379 mmap: mmap, 1380 munmap: munmap, 1381} 1382 1383func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { 1384 return mapper.Mmap(fd, offset, length, prot, flags) 1385} 1386 1387func Munmap(b []byte) (err error) { 1388 return mapper.Munmap(b) 1389} 1390 1391//sys Madvise(b []byte, advice int) (err error) 1392//sys Mprotect(b []byte, prot int) (err error) 1393//sys Mlock(b []byte) (err error) 1394//sys Mlockall(flags int) (err error) 1395//sys Msync(b []byte, flags int) (err error) 1396//sys Munlock(b []byte) (err error) 1397//sys Munlockall() (err error) 1398 1399// Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd, 1400// using the specified flags. 1401func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { 1402 n, _, errno := Syscall6( 1403 SYS_VMSPLICE, 1404 uintptr(fd), 1405 uintptr(unsafe.Pointer(&iovs[0])), 1406 uintptr(len(iovs)), 1407 uintptr(flags), 1408 0, 1409 0, 1410 ) 1411 if errno != 0 { 1412 return 0, syscall.Errno(errno) 1413 } 1414 1415 return int(n), nil 1416} 1417 1418//sys faccessat(dirfd int, path string, mode uint32) (err error) 1419 1420func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { 1421 if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 { 1422 return EINVAL 1423 } 1424 1425 // The Linux kernel faccessat system call does not take any flags. 1426 // The glibc faccessat implements the flags itself; see 1427 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;hb=HEAD 1428 // Because people naturally expect syscall.Faccessat to act 1429 // like C faccessat, we do the same. 1430 1431 if flags == 0 { 1432 return faccessat(dirfd, path, mode) 1433 } 1434 1435 var st Stat_t 1436 if err := Fstatat(dirfd, path, &st, flags&AT_SYMLINK_NOFOLLOW); err != nil { 1437 return err 1438 } 1439 1440 mode &= 7 1441 if mode == 0 { 1442 return nil 1443 } 1444 1445 var uid int 1446 if flags&AT_EACCESS != 0 { 1447 uid = Geteuid() 1448 } else { 1449 uid = Getuid() 1450 } 1451 1452 if uid == 0 { 1453 if mode&1 == 0 { 1454 // Root can read and write any file. 1455 return nil 1456 } 1457 if st.Mode&0111 != 0 { 1458 // Root can execute any file that anybody can execute. 1459 return nil 1460 } 1461 return EACCES 1462 } 1463 1464 var fmode uint32 1465 if uint32(uid) == st.Uid { 1466 fmode = (st.Mode >> 6) & 7 1467 } else { 1468 var gid int 1469 if flags&AT_EACCESS != 0 { 1470 gid = Getegid() 1471 } else { 1472 gid = Getgid() 1473 } 1474 1475 if uint32(gid) == st.Gid { 1476 fmode = (st.Mode >> 3) & 7 1477 } else { 1478 fmode = st.Mode & 7 1479 } 1480 } 1481 1482 if fmode&mode == mode { 1483 return nil 1484 } 1485 1486 return EACCES 1487} 1488 1489/* 1490 * Unimplemented 1491 */ 1492// AfsSyscall 1493// Alarm 1494// ArchPrctl 1495// Brk 1496// Capget 1497// Capset 1498// ClockGetres 1499// ClockNanosleep 1500// ClockSettime 1501// Clone 1502// CreateModule 1503// DeleteModule 1504// EpollCtlOld 1505// EpollPwait 1506// EpollWaitOld 1507// Execve 1508// Fork 1509// Futex 1510// GetKernelSyms 1511// GetMempolicy 1512// GetRobustList 1513// GetThreadArea 1514// Getitimer 1515// Getpmsg 1516// IoCancel 1517// IoDestroy 1518// IoGetevents 1519// IoSetup 1520// IoSubmit 1521// IoprioGet 1522// IoprioSet 1523// KexecLoad 1524// LookupDcookie 1525// Mbind 1526// MigratePages 1527// Mincore 1528// ModifyLdt 1529// Mount 1530// MovePages 1531// MqGetsetattr 1532// MqNotify 1533// MqOpen 1534// MqTimedreceive 1535// MqTimedsend 1536// MqUnlink 1537// Mremap 1538// Msgctl 1539// Msgget 1540// Msgrcv 1541// Msgsnd 1542// Nfsservctl 1543// Personality 1544// Pselect6 1545// Ptrace 1546// Putpmsg 1547// QueryModule 1548// Quotactl 1549// Readahead 1550// Readv 1551// RemapFilePages 1552// RestartSyscall 1553// RtSigaction 1554// RtSigpending 1555// RtSigprocmask 1556// RtSigqueueinfo 1557// RtSigreturn 1558// RtSigsuspend 1559// RtSigtimedwait 1560// SchedGetPriorityMax 1561// SchedGetPriorityMin 1562// SchedGetparam 1563// SchedGetscheduler 1564// SchedRrGetInterval 1565// SchedSetparam 1566// SchedYield 1567// Security 1568// Semctl 1569// Semget 1570// Semop 1571// Semtimedop 1572// SetMempolicy 1573// SetRobustList 1574// SetThreadArea 1575// SetTidAddress 1576// Shmat 1577// Shmctl 1578// Shmdt 1579// Shmget 1580// Sigaltstack 1581// Signalfd 1582// Swapoff 1583// Swapon 1584// Sysfs 1585// TimerCreate 1586// TimerDelete 1587// TimerGetoverrun 1588// TimerGettime 1589// TimerSettime 1590// Timerfd 1591// Tkill (obsolete) 1592// Tuxcall 1593// Umount2 1594// Uselib 1595// Utimensat 1596// Vfork 1597// Vhangup 1598// Vserver 1599// Waitid 1600// _Sysctl 1601