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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* 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 "pal_defs.h"
- #include "pal_linux_defs.h"
- #include "pal.h"
- #include "pal_internal.h"
- #include "pal_linux.h"
- #include "pal_error.h"
- #include "pal_security.h"
- #include "pal_debug.h"
- #include "api.h"
- #include <linux/types.h>
- typedef __kernel_pid_t pid_t;
- #include <asm/fcntl.h>
- #include <asm/poll.h>
- #include <linux/un.h>
- static int pipe_path (int pipeid, char * path, int len)
- {
- /* use abstrace UNIX sockets for pipes */
- memset(path, 0, len);
- return snprintf(path + 1, len - 1, "%s%08x", pal_sec.pipe_prefix, 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 inline int pipe_type (int options)
- {
- int type = SOCK_STREAM;
- if (options & PAL_OPTION_NONBLOCK)
- type |= SOCK_NONBLOCK;
- return type;
- }
- static int pipe_listen (PAL_HANDLE * handle, PAL_NUM pipeid, int options)
- {
- struct sockaddr_un addr;
- int ret;
- if ((ret = pipe_addr(pipeid, &addr)) < 0)
- return ret;
- unsigned int addrlen = sizeof(struct sockaddr_un);
- struct sockopt sock_options;
- ret = ocall_sock_listen(AF_UNIX, pipe_type(options), 0,
- (struct sockaddr *) &addr, &addrlen,
- &sock_options);
- if (ret < 0)
- return ret;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(pipe));
- SET_HANDLE_TYPE(hdl, pipesrv);
- HANDLE_HDR(hdl)->flags |= RFD(0);
- hdl->pipe.fd = ret;
- 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;
- struct sockopt sock_options;
- int ret = ocall_sock_accept(handle->pipe.fd, NULL, NULL, &sock_options);
- if (ret < 0)
- return ret;
- PAL_HANDLE clnt = malloc(HANDLE_SIZE(pipe));
- SET_HANDLE_TYPE(clnt, pipecli);
- HANDLE_HDR(clnt)->flags |= RFD(0)|WFD(0)|WRITEABLE(0);
- clnt->pipe.fd = ret;
- clnt->pipe.pipeid = handle->pipe.pipeid;
- *client = clnt;
- return 0;
- }
- static int pipe_connect (PAL_HANDLE * handle, PAL_NUM pipeid, int options)
- {
- struct sockaddr_un addr;
- int ret;
- if ((ret = pipe_addr(pipeid, &addr)) < 0)
- return ret;
- struct sockopt sock_options;
- ret = ocall_sock_connect(AF_UNIX, pipe_type(options), 0,
- (void *) &addr, sizeof(struct sockaddr_un),
- NULL, NULL, &sock_options);
- if (ret < 0)
- return ret;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(pipe));
- SET_HANDLE_TYPE(hdl, pipe);
- HANDLE_HDR(hdl)->flags |= RFD(0)|WFD(0)|WRITEABLE(0);
- hdl->pipe.fd = ret;
- 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];
- int type = SOCK_STREAM;
- if (options & PAL_OPTION_NONBLOCK)
- type |= SOCK_NONBLOCK;
- ret = ocall_socketpair(AF_UNIX, type, 0, fds);
- if (ret < 0)
- return ret;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(pipeprv));
- SET_HANDLE_TYPE(hdl, pipeprv);
- HANDLE_HDR(hdl)->flags |= RFD(0)|WFD(1)|WRITEABLE(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)
- {
- options &= PAL_OPTION_MASK;
- if (strpartcmp_static(type, "pipe:") && !*uri)
- return pipe_private(handle, options);
- char * endptr;
- PAL_NUM pipeid = strtol(uri, &endptr, 10);
- if (*endptr)
- return -PAL_ERROR_INVAL;
- if (strpartcmp_static(type, "pipe.srv:"))
- return pipe_listen(handle, pipeid, options);
- if (strpartcmp_static(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 (!IS_HANDLE_TYPE(handle, pipecli) &&
- !IS_HANDLE_TYPE(handle, pipeprv) &&
- !IS_HANDLE_TYPE(handle, pipe))
- return -PAL_ERROR_NOTCONNECTION;
- if (len >= (1ULL << (sizeof(unsigned int) * 8)))
- return -PAL_ERROR_INVAL;
- int fd = IS_HANDLE_TYPE(handle, pipeprv) ? handle->pipeprv.fds[0] :
- handle->pipe.fd;
- int bytes = ocall_sock_recv(fd, buffer, len, NULL, NULL);
- if (bytes < 0)
- return 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, uint64_t len,
- const void * buffer)
- {
- if (!IS_HANDLE_TYPE(handle, pipecli) &&
- !IS_HANDLE_TYPE(handle, pipeprv) &&
- !IS_HANDLE_TYPE(handle, pipe))
- return -PAL_ERROR_NOTCONNECTION;
- if (len >= (1ULL << (sizeof(unsigned int) * 8)))
- return -PAL_ERROR_INVAL;
- int fd = IS_HANDLE_TYPE(handle, pipeprv) ? handle->pipeprv.fds[1] :
- handle->pipe.fd;
- int bytes = ocall_sock_send(fd, buffer, len, NULL, 0);
- PAL_FLG writeable = IS_HANDLE_TYPE(handle, pipeprv) ? WRITEABLE(1) :
- WRITEABLE(0);
- if (bytes == -PAL_ERROR_TRYAGAIN)
- HANDLE_HDR(handle)->flags &= ~writeable;
- if (bytes < 0)
- return bytes;
- if (bytes == len)
- HANDLE_HDR(handle)->flags |= writeable;
- else
- HANDLE_HDR(handle)->flags &= ~writeable;
- 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) {
- ocall_close(handle->pipeprv.fds[0]);
- handle->pipeprv.fds[0] = PAL_IDX_POISON;
- }
- if (handle->pipeprv.fds[1] != PAL_IDX_POISON) {
- ocall_close(handle->pipeprv.fds[1]);
- handle->pipeprv.fds[1] = PAL_IDX_POISON;
- }
- return 0;
- }
- if (handle->pipe.fd != PAL_IDX_POISON) {
- ocall_close(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) {
- ocall_close(handle->pipeprv.fds[0]);
- handle->pipeprv.fds[0] = PAL_IDX_POISON;
- }
- if (handle->pipeprv.fds[1] != PAL_IDX_POISON) {
- ocall_close(handle->pipeprv.fds[1]);
- handle->pipeprv.fds[1] = PAL_IDX_POISON;
- }
- break;
- case PAL_DELETE_RD:
- if (handle->pipeprv.fds[0] != PAL_IDX_POISON) {
- ocall_close(handle->pipeprv.fds[0]);
- handle->pipeprv.fds[0] = PAL_IDX_POISON;
- }
- break;
- case PAL_DELETE_WR:
- if (handle->pipeprv.fds[1] != PAL_IDX_POISON) {
- ocall_close(handle->pipeprv.fds[1]);
- handle->pipeprv.fds[1] = PAL_IDX_POISON;
- }
- break;
- default:
- return -PAL_ERROR_INVAL;
- }
- }
- if (IS_HANDLE_TYPE(handle, pipesrv)) {
- char buffer[108];
- pipe_path(handle->pipe.pipeid, buffer, 108);
- ocall_delete(buffer);
- return 0;
- }
- 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;
- }
- ocall_sock_shutdown(handle->pipe.fd, shutdown);
- return 0;
- }
- static int pipe_attrquerybyhdl (PAL_HANDLE handle, PAL_STREAM_ATTR * attr)
- {
- if (handle->generic.fds[0] == PAL_IDX_POISON)
- return -PAL_ERROR_BADHANDLE;
- attr->handle_type = PAL_GET_TYPE(handle);
- int read_fd = handle->generic.fds[0];
- int flags = HANDLE_HDR(handle)->flags;
- if (!IS_HANDLE_TYPE(handle, pipesrv)) {
- int ret = ocall_fionread(read_fd);
- if (ret < 0)
- return -ret;
- attr->pending_size = ret;
- attr->writeable = flags & (
- IS_HANDLE_TYPE(handle, pipeprv) ? WRITEABLE(1) : WRITEABLE(0));
- } else {
- attr->pending_size = 0;
- attr->writeable = PAL_FALSE;
- }
- struct pollfd pfd = { .fd = read_fd, .events = POLLIN, .revents = 0 };
- unsigned long waittime = 0;
- int ret = ocall_poll(&pfd, 1, &waittime);
- if (ret < 0)
- return ret;
-
- attr->readable = (ret == 1 && pfd.revents == POLLIN);
- attr->disconnected = flags & ERROR(0);
- attr->nonblocking = IS_HANDLE_TYPE(handle, pipeprv) ?
- handle->pipeprv.nonblocking : handle->pipe.nonblocking;
- 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;
- PAL_BOL * nonblocking = (HANDLE_HDR(handle)->type == pal_type_pipeprv) ?
- &handle->pipeprv.nonblocking :
- &handle->pipe.nonblocking;
- if (attr->nonblocking != *nonblocking) {
- int ret = ocall_fsetnonblock(handle->generic.fds[0], attr->nonblocking);
- if (ret < 0)
- return ret;
- *nonblocking = attr->nonblocking;
- }
- return 0;
- }
- static int pipe_getname (PAL_HANDLE handle, char * buffer, int count)
- {
- int old_count = count;
- int ret;
- const char * prefix = NULL;
- int prefix_len = 0;
- switch (HANDLE_TYPE(handle)) {
- case pal_type_pipesrv:
- case pal_type_pipecli:
- prefix_len = 8;
- prefix = "pipe.srv";
- break;
- case pal_type_pipe:
- prefix_len = 4;
- prefix = "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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