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/* $OpenBSD: msg.c,v 1.1 2004/07/13 22:02:40 jfb Exp $ */
/*
* Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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/param.h>
#include <sys/uio.h>
#include <pwd.h>
#include <grp.h>
#include <poll.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "log.h"
#include "cvsd.h"
/*
* cvsd_sendmsg()
*
* Send a message of type <type> along with the first <len> bytes of data
* from <data> (which can be up to CVSD_MSG_MAXLEN bytes) on the descriptor
* <fd>.
* Returns 0 on success, or -1 on failure.
*/
int
cvsd_sendmsg(int fd, u_int type, const void *data, size_t len)
{
struct iovec iov[2];
struct cvsd_msg msg;
if (len > CVSD_MSG_MAXLEN) {
cvs_log(LP_ERR, "message too large");
return (-1);
}
msg.cm_type = type;
msg.cm_len = len;
iov[0].iov_base = &msg;
iov[0].iov_len = sizeof(msg);
iov[1].iov_base = (void *)data;
iov[1].iov_len = len;
if (writev(fd, iov, 2) == -1) {
cvs_log(LP_ERRNO, "failed to send message");
return (-1);
}
return (0);
}
/*
* cvsd_recvmsg()
*
* Read a message from the file descriptor <fd> and store the message data
* in the <dst> buffer. The <len> parameter should contain the maximum
* length of data that can be stored in <dst>, and will contain the actual
* size of data stored on return. The message type is stored in <type>.
* Returns 0 on success, or -1 on failure.
*/
int
cvsd_recvmsg(int fd, u_int *type, void *dst, size_t *len)
{
ssize_t ret;
struct cvsd_msg msg;
if (read(fd, &msg, sizeof(msg)) == -1) {
cvs_log(LP_ERRNO, "failed to read message header");
return (-1);
}
if (*len < msg.cm_len) {
cvs_log(LP_ERR, "buffer size too small for message data");
return (-1);
}
ret = read(fd, dst, msg.cm_len);
if (ret == -1) {
cvs_log(LP_ERRNO, "failed to read message");
return (-1);
}
else if (ret == 0) {
}
*type = msg.cm_type;
return (0);
}
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