Revert 187554 "Implement IPC::ChannelFactory, a class that accep..."

ipc/unix_domain_socket_util.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ipc/unix_domain_socket_util.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/un.h>
-#include <unistd.h>
-
-#include "base/file_util.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/posix/eintr_wrapper.h"
-
-namespace IPC {
-
-// Verify that kMaxSocketNameLength is a decent size.
-COMPILE_ASSERT(sizeof(((sockaddr_un*)0)->sun_path) >= kMaxSocketNameLength,
-               BAD_SUN_PATH_LENGTH);
-
-namespace {
-
-// Returns fd (>= 0) on success, -1 on failure. If successful, fills in
-// |unix_addr| with the appropriate data for the socket, and sets
-// |unix_addr_len| to the length of the data therein.
-int MakeUnixAddrForPath(const std::string& socket_name,
-                        struct sockaddr_un* unix_addr,
-                        size_t* unix_addr_len) {
-  DCHECK(unix_addr);
-  DCHECK(unix_addr_len);
-
-  if (socket_name.length() == 0) {
-    LOG(ERROR) << "Empty socket name provided for unix socket address.";
-    return -1;
-  }
-  // We reject socket_name.length() == kMaxSocketNameLength to make room for
-  // the NUL terminator at the end of the string.
-  if (socket_name.length() >= kMaxSocketNameLength) {
-    LOG(ERROR) << "Socket name too long: " << socket_name;
-    return -1;
-  }
-
-  // Create socket.
-  int fd = socket(AF_UNIX, SOCK_STREAM, 0);
-  if (fd < 0) {
-    PLOG(ERROR) << "socket";
-    return -1;
-  }
-  file_util::ScopedFD scoped_fd(&fd);
-
-  // Make socket non-blocking
-  if (HANDLE_EINTR(fcntl(fd, F_SETFL, O_NONBLOCK)) < 0) {
-    PLOG(ERROR) << "fcntl(O_NONBLOCK)";
-    return -1;
-  }
-
-  // Create unix_addr structure.
-  memset(unix_addr, 0, sizeof(struct sockaddr_un));
-  unix_addr->sun_family = AF_UNIX;
-  strncpy(unix_addr->sun_path, socket_name.c_str(), kMaxSocketNameLength);
-  *unix_addr_len =
-      offsetof(struct sockaddr_un, sun_path) + socket_name.length();
-  return *scoped_fd.release();
-}
-
-}  // namespace
-
-bool CreateServerUnixDomainSocket(const base::FilePath& socket_path,
-                                  int* server_listen_fd) {
-  DCHECK(server_listen_fd);
-
-  std::string socket_name = socket_path.value();
-  base::FilePath socket_dir = socket_path.DirName();
-
-  struct sockaddr_un unix_addr;
-  size_t unix_addr_len;
-  int fd = MakeUnixAddrForPath(socket_name, &unix_addr, &unix_addr_len);
-  if (fd < 0)
-    return false;
-  file_util::ScopedFD scoped_fd(&fd);
-
-  // Make sure the path we need exists.
-  if (!file_util::CreateDirectory(socket_dir)) {
-    LOG(ERROR) << "Couldn't create directory: " << socket_dir.value();
-    return false;
-  }
-
-  // Delete any old FS instances.
-  if (unlink(socket_name.c_str()) < 0 && errno != ENOENT) {
-    PLOG(ERROR) << "unlink " << socket_name;
-    return false;
-  }
-
-  // Bind the socket.
-  if (bind(fd, reinterpret_cast<const sockaddr*>(&unix_addr),
-           unix_addr_len) < 0) {
-    PLOG(ERROR) << "bind " << socket_path.value();
-    return false;
-  }
-
-  // Start listening on the socket.
-  if (listen(fd, SOMAXCONN) < 0) {
-    PLOG(ERROR) << "listen " << socket_path.value();
-    unlink(socket_name.c_str());
-    return false;
-  }
-
-  *server_listen_fd = *scoped_fd.release();
-  return true;
-}
-
-bool CreateClientUnixDomainSocket(const base::FilePath& socket_path,
-                                  int* client_socket) {
-  DCHECK(client_socket);
-
-  std::string socket_name = socket_path.value();
-  base::FilePath socket_dir = socket_path.DirName();
-
-  struct sockaddr_un unix_addr;
-  size_t unix_addr_len;
-  int fd = MakeUnixAddrForPath(socket_name, &unix_addr, &unix_addr_len);
-  if (fd < 0)
-    return false;
-  file_util::ScopedFD scoped_fd(&fd);
-
-  if (HANDLE_EINTR(connect(fd, reinterpret_cast<sockaddr*>(&unix_addr),
-                           unix_addr_len)) < 0) {
-    PLOG(ERROR) << "connect " << socket_path.value();
-    return false;
-  }
-
-  *client_socket = *scoped_fd.release();
-  return true;
-}
-
-bool GetPeerEuid(int fd, uid_t* peer_euid) {
-  DCHECK(peer_euid);
-#if defined(OS_MACOSX) || defined(OS_OPENBSD) || defined(OS_FREEBSD)
-  uid_t socket_euid;
-  gid_t socket_gid;
-  if (getpeereid(fd, &socket_euid, &socket_gid) < 0) {
-    PLOG(ERROR) << "getpeereid " << fd;
-    return false;
-  }
-  *peer_euid = socket_euid;
-  return true;
-#else
-  struct ucred cred;
-  socklen_t cred_len = sizeof(cred);
-  if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &cred_len) < 0) {
-    PLOG(ERROR) << "getsockopt " << fd;
-    return false;
-  }
-  if (static_cast<unsigned>(cred_len) < sizeof(cred)) {
-    NOTREACHED() << "Truncated ucred from SO_PEERCRED?";
-    return false;
-  }
-  *peer_euid = cred.uid;
-  return true;
-#endif
-}
-
-bool IsPeerAuthorized(int peer_fd) {
-  uid_t peer_euid;
-  if (!GetPeerEuid(peer_fd, &peer_euid))
-    return false;
-  if (peer_euid != geteuid()) {
-    DLOG(ERROR) << "Client euid is not authorised";
-    return false;
-  }
-  return true;
-}
-
-bool IsRecoverableError(int err) {
-  return errno == ECONNABORTED || errno == EMFILE || errno == ENFILE ||
-         errno == ENOMEM || errno == ENOBUFS;
-}
-
-bool ServerAcceptConnection(int server_listen_fd, int* server_socket) {
-  DCHECK(server_socket);
-  *server_socket = -1;
-
-  int accept_fd = HANDLE_EINTR(accept(server_listen_fd, NULL, 0));
-  if (accept_fd < 0)
-    return IsRecoverableError(errno);
-  file_util::ScopedFD scoped_fd(&accept_fd);
-  if (HANDLE_EINTR(fcntl(accept_fd, F_SETFL, O_NONBLOCK)) < 0) {
-    PLOG(ERROR) << "fcntl(O_NONBLOCK) " << accept_fd;
-    // It's safe to keep listening on |server_listen_fd| even if the attempt to
-    // set O_NONBLOCK failed on the client fd.
-    return true;
-  }
-
-  *server_socket = *scoped_fd.release();
-  return true;
-}
-
-}  // namespace IPC