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- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * db_pipes.c
- *
- * This file contains oeprands to handle streams with URIs that start with
- * "pipe:" or "pipe.srv:".
- */
- #include <linux/types.h>
- #include "api.h"
- #include "pal.h"
- #include "pal_debug.h"
- #include "pal_defs.h"
- #include "pal_error.h"
- #include "pal_internal.h"
- #include "pal_linux.h"
- #include "pal_linux_defs.h"
- #include "pal_security.h"
- typedef __kernel_pid_t pid_t;
- #include <asm/errno.h>
- #include <asm/fcntl.h>
- #include <asm/poll.h>
- #include <linux/time.h>
- #include <linux/un.h>
- #include <sys/socket.h>
- static int pipe_path(int pipeid, char* path, int len) {
- /* use abstract UNIX sockets for pipes */
- memset(path, 0, len);
- if (pal_sec.pipe_prefix_id)
- return snprintf(path + 1, len - 1, GRAPHENE_UNIX_PREFIX_FMT "/%08x", pal_sec.pipe_prefix_id,
- pipeid);
- else
- return snprintf(path + 1, len - 1, "/graphene/%08x", pipeid);
- }
- static int pipe_addr(int pipeid, struct sockaddr_un* addr) {
- addr->sun_family = AF_UNIX;
- return pipe_path(pipeid, (char*)addr->sun_path, sizeof(addr->sun_path));
- }
- static int pipe_listen(PAL_HANDLE* handle, PAL_NUM pipeid, int options) {
- int ret, fd;
- fd = INLINE_SYSCALL(socket, 3, AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | options, 0);
- if (IS_ERR(fd))
- return -PAL_ERROR_DENIED;
- struct sockaddr_un addr;
- if ((ret = pipe_addr(pipeid, &addr)) < 0)
- return ret;
- ret = INLINE_SYSCALL(bind, 3, fd, &addr, sizeof(addr.sun_path) - 1);
- if (IS_ERR(ret)) {
- INLINE_SYSCALL(close, 1, fd);
- switch (ERRNO(ret)) {
- case EINVAL:
- return -PAL_ERROR_INVAL;
- case EADDRINUSE:
- return -PAL_ERROR_STREAMEXIST;
- default:
- return -PAL_ERROR_DENIED;
- }
- }
- ret = INLINE_SYSCALL(listen, 2, fd, 1);
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(pipe));
- SET_HANDLE_TYPE(hdl, pipesrv);
- HANDLE_HDR(hdl)->flags |= RFD(0);
- hdl->pipe.fd = fd;
- hdl->pipe.pipeid = pipeid;
- hdl->pipe.nonblocking = options & PAL_OPTION_NONBLOCK ? PAL_TRUE : PAL_FALSE;
- *handle = hdl;
- return 0;
- }
- static int pipe_waitforclient(PAL_HANDLE handle, PAL_HANDLE* client) {
- if (!IS_HANDLE_TYPE(handle, pipesrv))
- return -PAL_ERROR_NOTSERVER;
- if (handle->pipe.fd == PAL_IDX_POISON)
- return -PAL_ERROR_DENIED;
- int newfd = INLINE_SYSCALL(accept4, 4, handle->pipe.fd, NULL, NULL, O_CLOEXEC);
- if (IS_ERR(newfd))
- switch (ERRNO(newfd)) {
- case EWOULDBLOCK:
- return -PAL_ERROR_TRYAGAIN;
- case ECONNABORTED:
- return -PAL_ERROR_CONNFAILED;
- default:
- return -PAL_ERROR_DENIED;
- }
- PAL_HANDLE clnt = malloc(HANDLE_SIZE(pipe));
- SET_HANDLE_TYPE(clnt, pipecli);
- HANDLE_HDR(clnt)->flags |= RFD(0) | WFD(0);
- clnt->pipe.fd = newfd;
- clnt->pipe.pipeid = handle->pipe.pipeid;
- clnt->pipe.nonblocking = PAL_FALSE;
- *client = clnt;
- return 0;
- }
- static int pipe_connect(PAL_HANDLE* handle, PAL_NUM pipeid, int options) {
- int ret, fd;
- fd = INLINE_SYSCALL(socket, 3, AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | options, 0);
- if (IS_ERR(fd))
- return -PAL_ERROR_DENIED;
- struct sockaddr_un addr;
- if ((ret = pipe_addr(pipeid, &addr)) < 0)
- return ret;
- ret = INLINE_SYSCALL(connect, 3, fd, &addr, sizeof(addr.sun_path) - 1);
- if (IS_ERR(ret)) {
- INLINE_SYSCALL(close, 1, fd);
- switch (ERRNO(ret)) {
- case ECONNREFUSED:
- return -PAL_ERROR_STREAMNOTEXIST;
- case EINTR:
- return -PAL_ERROR_TRYAGAIN;
- default:
- return -PAL_ERROR_DENIED;
- }
- }
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(pipe));
- SET_HANDLE_TYPE(hdl, pipe);
- HANDLE_HDR(hdl)->flags |= RFD(0) | WFD(0);
- hdl->pipe.fd = fd;
- hdl->pipe.pipeid = pipeid;
- hdl->pipe.nonblocking = (options & PAL_OPTION_NONBLOCK) ? PAL_TRUE : PAL_FALSE;
- *handle = hdl;
- return 0;
- }
- static int pipe_private(PAL_HANDLE* handle, int options) {
- int ret, fds[2];
- ret = INLINE_SYSCALL(socketpair, 4, AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | options, 0, fds);
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(pipeprv));
- SET_HANDLE_TYPE(hdl, pipeprv);
- HANDLE_HDR(hdl)->flags |= RFD(0) | WFD(1);
- hdl->pipeprv.fds[0] = fds[0];
- hdl->pipeprv.fds[1] = fds[1];
- hdl->pipeprv.nonblocking = (options & PAL_OPTION_NONBLOCK) ? PAL_TRUE : PAL_FALSE;
- *handle = hdl;
- return 0;
- }
- /* 'open' operation of pipe stream. For each pipe stream, it is
- identified by a decimal number in URI. There could be two
- types: pipe and pipe.srv. They behave pretty much the same,
- except they are two ends of the pipe. */
- static int pipe_open(PAL_HANDLE* handle, const char* type, const char* uri, int access, int share,
- int create, int options) {
- if (!WITHIN_MASK(access, PAL_ACCESS_MASK) || !WITHIN_MASK(share, PAL_SHARE_MASK) ||
- !WITHIN_MASK(create, PAL_CREATE_MASK) || !WITHIN_MASK(options, PAL_OPTION_MASK))
- return -PAL_ERROR_INVAL;
- if (!strcmp_static(type, URI_TYPE_PIPE) && !*uri)
- return pipe_private(handle, options);
- char* endptr;
- PAL_NUM pipeid = strtol(uri, &endptr, 10);
- if (*endptr)
- return -PAL_ERROR_INVAL;
- if (!strcmp_static(type, URI_TYPE_PIPE_SRV))
- return pipe_listen(handle, pipeid, options);
- if (!strcmp_static(type, URI_TYPE_PIPE))
- return pipe_connect(handle, pipeid, options);
- return -PAL_ERROR_INVAL;
- }
- /* 'read' operation of pipe stream. offset does not apply here. */
- static int64_t pipe_read(PAL_HANDLE handle, uint64_t offset, uint64_t len, void* buffer) {
- if (offset)
- return -PAL_ERROR_INVAL;
- if (!IS_HANDLE_TYPE(handle, pipecli) && !IS_HANDLE_TYPE(handle, pipeprv) &&
- !IS_HANDLE_TYPE(handle, pipe))
- return -PAL_ERROR_NOTCONNECTION;
- int fd = IS_HANDLE_TYPE(handle, pipeprv) ? handle->pipeprv.fds[0] : handle->pipe.fd;
- int64_t bytes = 0;
- bytes = INLINE_SYSCALL(read, 3, fd, buffer, len);
- if (IS_ERR(bytes))
- bytes = unix_to_pal_error(ERRNO(bytes));
- if (!bytes)
- return -PAL_ERROR_ENDOFSTREAM;
- return bytes;
- }
- /* 'write' operation of pipe stream. offset does not apply here. */
- static int64_t pipe_write(PAL_HANDLE handle, uint64_t offset, size_t len, const void* buffer) {
- if (offset)
- return -PAL_ERROR_INVAL;
- if (!IS_HANDLE_TYPE(handle, pipecli) && !IS_HANDLE_TYPE(handle, pipeprv) &&
- !IS_HANDLE_TYPE(handle, pipe))
- return -PAL_ERROR_NOTCONNECTION;
- int fd = IS_HANDLE_TYPE(handle, pipeprv) ? handle->pipeprv.fds[1] : handle->pipe.fd;
- int64_t bytes = 0;
- bytes = INLINE_SYSCALL(write, 3, fd, buffer, len);
- if (IS_ERR(bytes))
- bytes = unix_to_pal_error(ERRNO(bytes));
- return bytes;
- }
- /* 'close' operation of pipe stream. */
- static int pipe_close(PAL_HANDLE handle) {
- if (IS_HANDLE_TYPE(handle, pipeprv)) {
- if (handle->pipeprv.fds[0] != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipeprv.fds[0]);
- handle->pipeprv.fds[0] = PAL_IDX_POISON;
- }
- if (handle->pipeprv.fds[1] != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipeprv.fds[1]);
- handle->pipeprv.fds[1] = PAL_IDX_POISON;
- }
- return 0;
- }
- if (handle->pipe.fd != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipe.fd);
- handle->pipe.fd = PAL_IDX_POISON;
- }
- return 0;
- }
- /* 'delete' operation of pipe stream. */
- static int pipe_delete(PAL_HANDLE handle, int access) {
- if (IS_HANDLE_TYPE(handle, pipeprv)) {
- switch (access) {
- case 0:
- if (handle->pipeprv.fds[0] != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipeprv.fds[0]);
- handle->pipeprv.fds[0] = PAL_IDX_POISON;
- }
- if (handle->pipeprv.fds[1] != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipeprv.fds[1]);
- handle->pipeprv.fds[1] = PAL_IDX_POISON;
- }
- break;
- case PAL_DELETE_RD:
- if (handle->pipeprv.fds[0] != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipeprv.fds[0]);
- handle->pipeprv.fds[0] = PAL_IDX_POISON;
- }
- break;
- case PAL_DELETE_WR:
- if (handle->pipeprv.fds[1] != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->pipeprv.fds[1]);
- handle->pipeprv.fds[1] = PAL_IDX_POISON;
- }
- break;
- default:
- return -PAL_ERROR_INVAL;
- }
- }
- if (handle->pipe.fd == PAL_IDX_POISON)
- return 0;
- int shutdown;
- switch (access) {
- case 0:
- shutdown = SHUT_RDWR;
- break;
- case PAL_DELETE_RD:
- shutdown = SHUT_RD;
- break;
- case PAL_DELETE_WR:
- shutdown = SHUT_WR;
- break;
- default:
- return -PAL_ERROR_INVAL;
- }
- INLINE_SYSCALL(shutdown, 2, handle->pipe.fd, shutdown);
- return 0;
- }
- static int pipe_attrquerybyhdl(PAL_HANDLE handle, PAL_STREAM_ATTR* attr) {
- int ret;
- int val;
- if (handle->pipe.fd == PAL_IDX_POISON)
- return -PAL_ERROR_BADHANDLE;
- attr->handle_type = HANDLE_HDR(handle)->type;
- attr->nonblocking = IS_HANDLE_TYPE(handle, pipeprv) ? handle->pipeprv.nonblocking
- : handle->pipe.nonblocking;
- attr->disconnected = HANDLE_HDR(handle)->flags & ERROR(0);
- /* get number of bytes available for reading (doesn't make sense for "listening" pipes) */
- attr->pending_size = 0;
- if (!IS_HANDLE_TYPE(handle, pipesrv)) {
- ret = INLINE_SYSCALL(ioctl, 3, handle->pipe.fd, FIONREAD, &val);
- if (IS_ERR(ret))
- return unix_to_pal_error(ERRNO(ret));
- attr->pending_size = val;
- }
- /* query if there is data available for reading/writing */
- if (IS_HANDLE_TYPE(handle, pipeprv)) {
- /* for private pipe, readable and writable are queried on different fds */
- struct pollfd pfd[2] = {{.fd = handle->pipeprv.fds[0], .events = POLLIN, .revents = 0},
- {.fd = handle->pipeprv.fds[1], .events = POLLOUT, .revents = 0}};
- struct timespec tp = {0, 0};
- ret = INLINE_SYSCALL(ppoll, 5, &pfd, 2, &tp, NULL, 0);
- if (IS_ERR(ret))
- return unix_to_pal_error(ERRNO(ret));
- attr->readable = ret >= 1 && (pfd[0].revents & (POLLIN | POLLERR | POLLHUP)) == POLLIN;
- attr->writable = ret >= 1 && (pfd[1].revents & (POLLOUT | POLLERR | POLLHUP)) == POLLOUT;
- } else {
- /* for non-private pipes, both readable and writable are queried on the same fd */
- short pfd_events = POLLIN;
- if (!IS_HANDLE_TYPE(handle, pipesrv)) {
- /* querying for writing doesn't make sense for "listening" pipes */
- pfd_events |= POLLOUT;
- }
- struct pollfd pfd = {.fd = handle->pipe.fd, .events = pfd_events, .revents = 0};
- struct timespec tp = {0, 0};
- ret = INLINE_SYSCALL(ppoll, 5, &pfd, 1, &tp, NULL, 0);
- if (IS_ERR(ret))
- return unix_to_pal_error(ERRNO(ret));
- attr->readable = ret == 1 && (pfd.revents & (POLLIN | POLLERR | POLLHUP)) == POLLIN;
- attr->writable = ret == 1 && (pfd.revents & (POLLOUT | POLLERR | POLLHUP)) == POLLOUT;
- }
- return 0;
- }
- static int pipe_attrsetbyhdl(PAL_HANDLE handle, PAL_STREAM_ATTR* attr) {
- if (handle->generic.fds[0] == PAL_IDX_POISON)
- return -PAL_ERROR_BADHANDLE;
- int ret;
- PAL_BOL* nonblocking = (HANDLE_HDR(handle)->type == pal_type_pipeprv)
- ? &handle->pipeprv.nonblocking
- : &handle->pipe.nonblocking;
- if (attr->nonblocking != *nonblocking) {
- ret = INLINE_SYSCALL(fcntl, 3, handle->generic.fds[0], F_SETFL,
- attr->nonblocking ? O_NONBLOCK : 0);
- if (IS_ERR(ret))
- return unix_to_pal_error(ERRNO(ret));
- *nonblocking = attr->nonblocking;
- }
- return 0;
- }
- static int pipe_getname(PAL_HANDLE handle, char* buffer, size_t count) {
- size_t old_count = count;
- int ret;
- const char* prefix = NULL;
- size_t prefix_len = 0;
- switch (PAL_GET_TYPE(handle)) {
- case pal_type_pipesrv:
- case pal_type_pipecli:
- prefix_len = static_strlen(URI_TYPE_PIPE_SRV);
- prefix = URI_TYPE_PIPE_SRV;
- break;
- case pal_type_pipe:
- prefix_len = static_strlen(URI_TYPE_PIPE);
- prefix = URI_TYPE_PIPE;
- break;
- case pal_type_pipeprv:
- default:
- return -PAL_ERROR_INVAL;
- }
- if (prefix_len >= count)
- return -PAL_ERROR_OVERFLOW;
- memcpy(buffer, prefix, prefix_len);
- buffer[prefix_len] = ':';
- buffer += prefix_len + 1;
- count -= prefix_len + 1;
- ret = snprintf(buffer, count, "%lu\n", handle->pipe.pipeid);
- if (buffer[ret - 1] != '\n') {
- memset(buffer, 0, count);
- return -PAL_ERROR_OVERFLOW;
- }
- buffer[ret - 1] = 0;
- buffer += ret - 1;
- count -= ret - 1;
- return old_count - count;
- }
- struct handle_ops pipe_ops = {
- .getname = &pipe_getname,
- .open = &pipe_open,
- .waitforclient = &pipe_waitforclient,
- .read = &pipe_read,
- .write = &pipe_write,
- .close = &pipe_close,
- .delete = &pipe_delete,
- .attrquerybyhdl = &pipe_attrquerybyhdl,
- .attrsetbyhdl = &pipe_attrsetbyhdl,
- };
- struct handle_ops pipeprv_ops = {
- .open = &pipe_open,
- .read = &pipe_read,
- .write = &pipe_write,
- .close = &pipe_close,
- .attrquerybyhdl = &pipe_attrquerybyhdl,
- .attrsetbyhdl = &pipe_attrsetbyhdl,
- };
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