This fixes the earlier mistake where I believed sockets were not meant to send SIGPIPE on bad writes, but the standard mandates that sockets do send SIGPIPE in such cases.
494 lines
14 KiB
C++
494 lines
14 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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net/fs.cpp
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Filesystem based socket interface.
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*******************************************************************************/
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// TODO: Should this be moved into user-space?
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#include <sys/un.h>
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#include <assert.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <sortix/fcntl.h>
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#include <sortix/poll.h>
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#include <sortix/socket.h>
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#include <sortix/stat.h>
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#include <sortix/kernel/descriptor.h>
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#include <sortix/kernel/inode.h>
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#include <sortix/kernel/ioctx.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/mtable.h>
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#include <sortix/kernel/pipe.h>
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#include <sortix/kernel/poll.h>
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#include <sortix/kernel/process.h>
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#include <sortix/kernel/refcount.h>
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#include "fs.h"
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// TODO: This is declared in the <sys/socket.h> header that isn't ready for
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// kernel usage, so we declare it here for now.
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#ifndef AF_UNIX
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#define AF_UNIX 3
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#endif
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namespace Sortix {
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namespace NetFS {
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class Manager;
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class StreamSocket;
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class Manager : public AbstractInode
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{
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public:
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Manager(uid_t owner, gid_t group, mode_t mode);
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virtual ~Manager() { }
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virtual Ref<Inode> open(ioctx_t* ctx, const char* filename, int flags,
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mode_t mode);
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public:
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bool Listen(StreamSocket* socket);
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void Unlisten(StreamSocket* socket);
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Ref<StreamSocket> Accept(StreamSocket* socket, ioctx_t* ctx, uint8_t* addr,
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size_t* addrsize, int flags);
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int AcceptPoll(StreamSocket* socket, ioctx_t* ctx, PollNode* node);
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bool Connect(StreamSocket* socket);
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private:
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StreamSocket* LookupServer(struct sockaddr_un* address);
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private:
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StreamSocket* first_server;
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StreamSocket* last_server;
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kthread_mutex_t manager_lock;
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};
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class StreamSocket : public AbstractInode
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{
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public:
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StreamSocket(uid_t owner, gid_t group, mode_t mode, Ref<Manager> manager);
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virtual ~StreamSocket();
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virtual Ref<Inode> accept(ioctx_t* ctx, uint8_t* addr, size_t* addrsize,
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int flags);
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virtual int bind(ioctx_t* ctx, const uint8_t* addr, size_t addrsize);
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virtual int connect(ioctx_t* ctx, const uint8_t* addr, size_t addrsize);
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virtual int listen(ioctx_t* ctx, int backlog);
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virtual ssize_t recv(ioctx_t* ctx, uint8_t* buf, size_t count, int flags);
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virtual ssize_t send(ioctx_t* ctx, const uint8_t* buf, size_t count,
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int flags);
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virtual ssize_t read(ioctx_t* ctx, uint8_t* buf, size_t count);
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virtual ssize_t write(ioctx_t* ctx, const uint8_t* buf, size_t count);
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virtual int poll(ioctx_t* ctx, PollNode* node);
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private:
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int do_bind(ioctx_t* ctx, const uint8_t* addr, size_t addrsize);
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public: /* For use by Manager. */
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PollChannel accept_poll_channel;
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Ref<Manager> manager;
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PipeEndpoint incoming;
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PipeEndpoint outgoing;
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StreamSocket* prev_socket;
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StreamSocket* next_socket;
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StreamSocket* first_pending;
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StreamSocket* last_pending;
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struct sockaddr_un* bound_address;
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bool is_listening;
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bool is_connected;
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bool is_refused;
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kthread_mutex_t socket_lock;
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kthread_cond_t pending_cond;
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kthread_cond_t accepted_cond;
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};
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static void QueueAppend(StreamSocket** first, StreamSocket** last,
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StreamSocket* socket)
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{
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assert(!socket->prev_socket);
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assert(!socket->next_socket);
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socket->prev_socket = *last;
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socket->next_socket = NULL;
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if ( *last )
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(*last)->next_socket = socket;
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if ( !*first )
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*first = socket;
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*last = socket;
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}
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static void QueueRemove(StreamSocket** first, StreamSocket** last,
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StreamSocket* socket)
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{
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if ( socket->prev_socket )
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socket->prev_socket->next_socket = socket->next_socket;
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else
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*first = socket->next_socket;
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if ( socket->next_socket )
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socket->next_socket->prev_socket = socket->prev_socket;
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else
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*last = socket->prev_socket;
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}
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StreamSocket::StreamSocket(uid_t owner, gid_t group, mode_t mode,
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Ref<Manager> manager)
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{
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inode_type = INODE_TYPE_STREAM;
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dev = (dev_t) manager.Get();
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ino = (ino_t) this;
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this->type = S_IFSOCK;
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this->stat_uid = owner;
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this->stat_gid = group;
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this->stat_mode = (mode & S_SETABLE) | this->type;
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this->prev_socket = NULL;
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this->next_socket = NULL;
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this->first_pending = NULL;
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this->last_pending = NULL;
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this->bound_address = NULL;
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this->is_listening = false;
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this->is_connected = false;
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this->is_refused = false;
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this->manager = manager;
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this->socket_lock = KTHREAD_MUTEX_INITIALIZER;
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this->pending_cond = KTHREAD_COND_INITIALIZER;
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this->accepted_cond = KTHREAD_COND_INITIALIZER;
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}
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StreamSocket::~StreamSocket()
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{
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if ( is_listening )
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manager->Unlisten(this);
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delete[] bound_address;
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}
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Ref<Inode> StreamSocket::accept(ioctx_t* ctx, uint8_t* addr, size_t* addrsize,
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int flags)
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{
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ScopedLock lock(&socket_lock);
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if ( !is_listening )
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return errno = EINVAL, Ref<Inode>(NULL);
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return manager->Accept(this, ctx, addr, addrsize, flags);
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}
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int StreamSocket::do_bind(ioctx_t* ctx, const uint8_t* addr, size_t addrsize)
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{
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if ( is_connected || is_listening || bound_address )
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return errno = EINVAL, -1;
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size_t path_offset = offsetof(struct sockaddr_un, sun_path);
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size_t path_len = (path_offset - addrsize) / sizeof(char);
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if ( addrsize < path_offset )
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return errno = EINVAL, -1;
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uint8_t* buffer = new uint8_t[addrsize];
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if ( !buffer )
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return -1;
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if ( ctx->copy_from_src(buffer, addr, addrsize) )
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{
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struct sockaddr_un* address = (struct sockaddr_un*) buffer;
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if ( address->sun_family == AF_UNIX )
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{
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bool found_nul = false;
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for ( size_t i = 0; !found_nul && i < path_len; i++ )
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if ( address->sun_path[i] == '\0' )
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found_nul = true;
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if ( found_nul )
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{
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bound_address = address;
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return 0;
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}
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errno = EINVAL;
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}
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else
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errno = EAFNOSUPPORT;
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}
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delete[] buffer;
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return -1;
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}
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int StreamSocket::bind(ioctx_t* ctx, const uint8_t* addr, size_t addrsize)
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{
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ScopedLock lock(&socket_lock);
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return do_bind(ctx, addr, addrsize);
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}
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int StreamSocket::connect(ioctx_t* ctx, const uint8_t* addr, size_t addrsize)
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{
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ScopedLock lock(&socket_lock);
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if ( is_listening )
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return errno = EINVAL, -1;
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if ( is_connected )
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return errno = EISCONN, -1;
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if ( addr && do_bind(ctx, addr, addrsize) != 0 )
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return -1;
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if ( !bound_address )
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return errno = EINVAL, -1;
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return manager->Connect(this) ? 0 : -1;
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}
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int StreamSocket::listen(ioctx_t* /*ctx*/, int /*backlog*/)
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{
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ScopedLock lock(&socket_lock);
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if ( is_connected || is_listening || !bound_address )
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return errno = EINVAL, -1;
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if ( !manager->Listen(this) )
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return -1;
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return 0;
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}
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ssize_t StreamSocket::recv(ioctx_t* ctx, uint8_t* buf, size_t count,
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int /*flags*/)
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{
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ScopedLock lock(&socket_lock);
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if ( !is_connected )
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return errno = ENOTCONN, -1;
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return incoming.read(ctx, buf, count);
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}
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ssize_t StreamSocket::send(ioctx_t* ctx, const uint8_t* buf, size_t count,
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int /*flags*/)
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{
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ScopedLock lock(&socket_lock);
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if ( !is_connected )
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return errno = ENOTCONN, -1;
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return outgoing.write(ctx, buf, count);
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}
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ssize_t StreamSocket::read(ioctx_t* ctx, uint8_t* buf, size_t count)
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{
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return recv(ctx, buf, count, 0);
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}
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ssize_t StreamSocket::write(ioctx_t* ctx, const uint8_t* buf, size_t count)
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{
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return send(ctx, buf, count, 0);
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}
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int StreamSocket::poll(ioctx_t* ctx, PollNode* node)
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{
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if ( is_connected )
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{
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PollNode* slave = node->CreateSlave();
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if ( !slave )
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return -1;
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int incoming_result = incoming.poll(ctx, node);
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int outgoing_result = outgoing.poll(ctx, slave);
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return incoming_result == 0 || outgoing_result == 0 ? 0 : -1;
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}
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if ( is_listening )
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return manager->AcceptPoll(this, ctx, node);
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return errno = ENOTCONN, -1;
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}
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Manager::Manager(uid_t owner, gid_t group, mode_t mode)
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{
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inode_type = INODE_TYPE_UNKNOWN;
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dev = (dev_t) this;
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ino = 0;
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this->type = S_IFDIR;
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this->stat_uid = owner;
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this->stat_gid = group;
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this->stat_mode = (mode & S_SETABLE) | this->type;
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this->manager_lock = KTHREAD_MUTEX_INITIALIZER;
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this->first_server = NULL;
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this->last_server = NULL;
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}
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static int CompareAddress(const struct sockaddr_un* a,
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const struct sockaddr_un* b)
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{
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return strcmp(a->sun_path, b->sun_path);
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}
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StreamSocket* Manager::LookupServer(struct sockaddr_un* address)
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{
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for ( StreamSocket* iter = first_server; iter; iter = iter->next_socket )
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if ( CompareAddress(iter->bound_address, address) == 0 )
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return iter;
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return NULL;
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}
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static StreamSocket* QueuePop(StreamSocket** first, StreamSocket** last)
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{
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StreamSocket* ret = *first;
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assert(ret);
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QueueRemove(first, last, ret);
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return ret;
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}
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bool Manager::Listen(StreamSocket* socket)
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{
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ScopedLock lock(&manager_lock);
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if ( LookupServer(socket->bound_address) )
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return errno = EADDRINUSE, false;
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QueueAppend(&first_server, &last_server, socket);
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socket->is_listening = true;
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return true;
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}
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void Manager::Unlisten(StreamSocket* socket)
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{
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ScopedLock lock(&manager_lock);
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while ( socket->first_pending )
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{
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socket->first_pending->is_refused = true;
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kthread_cond_signal(&socket->first_pending->accepted_cond);
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socket->first_pending = socket->first_pending->next_socket;
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}
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socket->last_pending = NULL;
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QueueRemove(&first_server, &last_server, socket);
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socket->is_listening = false;
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}
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int Manager::AcceptPoll(StreamSocket* socket, ioctx_t* /*ctx*/, PollNode* node)
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{
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ScopedLock lock(&manager_lock);
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if ( socket->first_pending &&
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((POLLIN | POLLRDNORM) & node->events) )
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return node->master->revents |= ((POLLIN | POLLRDNORM) & node->events), 0;
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socket->accept_poll_channel.Register(node);
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return errno = EAGAIN, -1;
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}
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Ref<StreamSocket> Manager::Accept(StreamSocket* socket, ioctx_t* ctx,
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uint8_t* addr, size_t* addrsize, int /*flags*/)
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{
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ScopedLock lock(&manager_lock);
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// TODO: Support non-blocking accept!
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while ( !socket->first_pending )
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if ( !kthread_cond_wait_signal(&socket->pending_cond, &manager_lock) )
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return errno = EINTR, Ref<StreamSocket>(NULL);
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StreamSocket* client = socket->first_pending;
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struct sockaddr_un* client_addr = client->bound_address;
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size_t client_addr_size = offsetof(struct sockaddr_un, sun_path) +
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(strlen(client_addr->sun_path)+1) * sizeof(char);
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if ( addr )
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{
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size_t caller_addrsize;
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if ( !ctx->copy_from_src(&caller_addrsize, addrsize, sizeof(caller_addrsize)) )
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return Ref<StreamSocket>(NULL);
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if ( caller_addrsize < client_addr_size )
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return errno = ERANGE, Ref<StreamSocket>(NULL);
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if ( !ctx->copy_from_src(addrsize, &client_addr_size, sizeof(client_addr_size)) )
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return Ref<StreamSocket>(NULL);
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if ( !ctx->copy_to_dest(addr, client_addr, client_addr_size) )
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return Ref<StreamSocket>(NULL);
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}
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// TODO: Give the caller the address of the remote!
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Ref<StreamSocket> server(new StreamSocket(0, 0, 0666, Ref<Manager>(this)));
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if ( !server )
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return Ref<StreamSocket>(NULL);
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QueuePop(&socket->first_pending, &socket->last_pending);
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if ( !client->outgoing.Connect(&server->incoming) )
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return Ref<StreamSocket>(NULL);
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if ( !server->outgoing.Connect(&client->incoming) )
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{
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client->outgoing.Disconnect();
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server->incoming.Disconnect();
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return Ref<StreamSocket>(NULL);
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}
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client->is_connected = true;
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server->is_connected = true;
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// TODO: Should the server socket inherit the address of the listening
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// socket or perhaps the one of the client's source/destination, or
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// nothing at all?
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kthread_cond_signal(&client->accepted_cond);
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return server;
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}
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bool Manager::Connect(StreamSocket* socket)
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{
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ScopedLock lock(&manager_lock);
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StreamSocket* server = LookupServer(socket->bound_address);
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if ( !server )
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return errno = ECONNREFUSED, false;
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socket->is_refused = false;
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QueueAppend(&server->first_pending, &server->last_pending, socket);
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kthread_cond_signal(&server->pending_cond);
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server->accept_poll_channel.Signal(POLLIN | POLLRDNORM);
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while ( !(socket->is_connected || socket->is_refused) )
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if ( !kthread_cond_wait_signal(&socket->accepted_cond, &manager_lock) &&
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!(socket->is_connected || socket->is_refused) )
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{
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QueueRemove(&server->first_pending, &server->last_pending, socket);
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return errno = EINTR, false;
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}
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return !socket->is_refused;
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}
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// TODO: Support a poll method in Manager.
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Ref<Inode> Manager::open(ioctx_t* /*ctx*/, const char* filename,
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int /*flags*/, mode_t /*mode*/)
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{
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if ( !strcmp(filename, "stream") )
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{
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StreamSocket* socket = new StreamSocket(0, 0, 0666, Ref<Manager>(this));
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return Ref<StreamSocket>(socket);
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}
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return errno = ENOENT, Ref<Inode>(NULL);
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}
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void Init(const char* devpath, Ref<Descriptor> slashdev)
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{
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ioctx_t ctx; SetupKernelIOCtx(&ctx);
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Ref<Inode> node(new Manager(0, 0, 0666));
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if ( !node )
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PanicF("Unable to allocate %s/net/fs inode.", devpath);
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// TODO: Race condition! Create a mkdir function that returns what it
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// created, possibly with a O_MKDIR flag to open.
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if ( slashdev->mkdir(&ctx, "net", 0755) < 0 && errno != EEXIST )
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PanicF("Could not create a %s/net directory", devpath);
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if ( slashdev->mkdir(&ctx, "net/fs", 0755) < 0 && errno != EEXIST )
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PanicF("Could not create a %s/net/fs directory", devpath);
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Ref<Descriptor> mpoint = slashdev->open(&ctx, "net/fs", O_READ | O_WRITE, 0);
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if ( !mpoint )
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PanicF("Could not open the %s/net/fs directory", devpath);
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Ref<MountTable> mtable = CurrentProcess()->GetMTable();
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// TODO: Make sure that the mount point is *empty*! Add a proper function
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// for this on the file descriptor class!
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if ( !mtable->AddMount(mpoint->ino, mpoint->dev, node) )
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PanicF("Unable to mount filesystem on %s/net/fs", devpath);
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}
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} // namespace NetFS
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} // namespace Sortix
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