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2b1b224d24
any negative number. MFC after: 3 days
238 lines
5.7 KiB
C
238 lines
5.7 KiB
C
/*-
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "pjdlog.h"
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#include "proto_impl.h"
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#define SP_CTX_MAGIC 0x50c3741
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struct sp_ctx {
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int sp_magic;
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int sp_fd[2];
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int sp_side;
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#define SP_SIDE_UNDEF 0
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#define SP_SIDE_CLIENT 1
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#define SP_SIDE_SERVER 2
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};
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static void sp_close(void *ctx);
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static int
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sp_client(const char *srcaddr, const char *dstaddr, void **ctxp)
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{
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struct sp_ctx *spctx;
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int ret;
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if (strcmp(dstaddr, "socketpair://") != 0)
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return (-1);
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PJDLOG_ASSERT(srcaddr == NULL);
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spctx = malloc(sizeof(*spctx));
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if (spctx == NULL)
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return (errno);
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if (socketpair(PF_UNIX, SOCK_STREAM, 0, spctx->sp_fd) == -1) {
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ret = errno;
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free(spctx);
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return (ret);
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}
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spctx->sp_side = SP_SIDE_UNDEF;
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spctx->sp_magic = SP_CTX_MAGIC;
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*ctxp = spctx;
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return (0);
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}
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static int
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sp_send(void *ctx, const unsigned char *data, size_t size, int fd)
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{
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struct sp_ctx *spctx = ctx;
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int sock;
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PJDLOG_ASSERT(spctx != NULL);
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PJDLOG_ASSERT(spctx->sp_magic == SP_CTX_MAGIC);
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switch (spctx->sp_side) {
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case SP_SIDE_UNDEF:
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/*
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* If the first operation done by the caller is proto_send(),
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* we assume this is the client.
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*/
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/* FALLTHROUGH */
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spctx->sp_side = SP_SIDE_CLIENT;
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/* Close other end. */
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close(spctx->sp_fd[1]);
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spctx->sp_fd[1] = -1;
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case SP_SIDE_CLIENT:
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PJDLOG_ASSERT(spctx->sp_fd[0] >= 0);
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sock = spctx->sp_fd[0];
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break;
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case SP_SIDE_SERVER:
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PJDLOG_ASSERT(spctx->sp_fd[1] >= 0);
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sock = spctx->sp_fd[1];
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break;
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default:
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PJDLOG_ABORT("Invalid socket side (%d).", spctx->sp_side);
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}
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/* Someone is just trying to decide about side. */
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if (data == NULL)
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return (0);
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return (proto_common_send(sock, data, size, fd));
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}
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static int
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sp_recv(void *ctx, unsigned char *data, size_t size, int *fdp)
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{
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struct sp_ctx *spctx = ctx;
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int fd;
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PJDLOG_ASSERT(spctx != NULL);
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PJDLOG_ASSERT(spctx->sp_magic == SP_CTX_MAGIC);
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switch (spctx->sp_side) {
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case SP_SIDE_UNDEF:
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/*
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* If the first operation done by the caller is proto_recv(),
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* we assume this is the server.
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*/
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/* FALLTHROUGH */
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spctx->sp_side = SP_SIDE_SERVER;
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/* Close other end. */
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close(spctx->sp_fd[0]);
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spctx->sp_fd[0] = -1;
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case SP_SIDE_SERVER:
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PJDLOG_ASSERT(spctx->sp_fd[1] >= 0);
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fd = spctx->sp_fd[1];
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break;
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case SP_SIDE_CLIENT:
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PJDLOG_ASSERT(spctx->sp_fd[0] >= 0);
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fd = spctx->sp_fd[0];
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break;
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default:
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PJDLOG_ABORT("Invalid socket side (%d).", spctx->sp_side);
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}
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/* Someone is just trying to decide about side. */
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if (data == NULL)
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return (0);
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return (proto_common_recv(fd, data, size, fdp));
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}
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static int
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sp_descriptor(const void *ctx)
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{
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const struct sp_ctx *spctx = ctx;
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PJDLOG_ASSERT(spctx != NULL);
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PJDLOG_ASSERT(spctx->sp_magic == SP_CTX_MAGIC);
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PJDLOG_ASSERT(spctx->sp_side == SP_SIDE_CLIENT ||
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spctx->sp_side == SP_SIDE_SERVER);
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switch (spctx->sp_side) {
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case SP_SIDE_CLIENT:
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PJDLOG_ASSERT(spctx->sp_fd[0] >= 0);
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return (spctx->sp_fd[0]);
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case SP_SIDE_SERVER:
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PJDLOG_ASSERT(spctx->sp_fd[1] >= 0);
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return (spctx->sp_fd[1]);
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}
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PJDLOG_ABORT("Invalid socket side (%d).", spctx->sp_side);
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}
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static void
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sp_close(void *ctx)
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{
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struct sp_ctx *spctx = ctx;
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PJDLOG_ASSERT(spctx != NULL);
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PJDLOG_ASSERT(spctx->sp_magic == SP_CTX_MAGIC);
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switch (spctx->sp_side) {
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case SP_SIDE_UNDEF:
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PJDLOG_ASSERT(spctx->sp_fd[0] >= 0);
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close(spctx->sp_fd[0]);
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spctx->sp_fd[0] = -1;
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PJDLOG_ASSERT(spctx->sp_fd[1] >= 0);
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close(spctx->sp_fd[1]);
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spctx->sp_fd[1] = -1;
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break;
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case SP_SIDE_CLIENT:
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PJDLOG_ASSERT(spctx->sp_fd[0] >= 0);
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close(spctx->sp_fd[0]);
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spctx->sp_fd[0] = -1;
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PJDLOG_ASSERT(spctx->sp_fd[1] == -1);
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break;
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case SP_SIDE_SERVER:
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PJDLOG_ASSERT(spctx->sp_fd[1] >= 0);
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close(spctx->sp_fd[1]);
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spctx->sp_fd[1] = -1;
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PJDLOG_ASSERT(spctx->sp_fd[0] == -1);
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break;
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default:
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PJDLOG_ABORT("Invalid socket side (%d).", spctx->sp_side);
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}
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spctx->sp_magic = 0;
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free(spctx);
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}
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static struct proto sp_proto = {
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.prt_name = "socketpair",
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.prt_client = sp_client,
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.prt_send = sp_send,
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.prt_recv = sp_recv,
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.prt_descriptor = sp_descriptor,
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.prt_close = sp_close
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};
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static __constructor void
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sp_ctor(void)
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{
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proto_register(&sp_proto, false);
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}
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