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