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/* $OpenBSD: imsg_util.c,v 1.8 2013/10/24 02:55:50 deraadt Exp $ */
/*
* Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <event.h>
#include "iked.h"
/*
* Extending the imsg buffer API for internal use
*/
int
ibuf_cat(struct ibuf *dst, struct ibuf *src)
{
return (ibuf_add(dst, src->buf, ibuf_size(src)));
}
void
ibuf_zero(struct ibuf *buf)
{
memset(buf->buf, 0, buf->wpos);
}
struct ibuf *
ibuf_new(void *data, size_t len)
{
struct ibuf *buf;
if ((buf = ibuf_dynamic(len,
IKED_MSGBUF_MAX)) == NULL)
return (NULL);
ibuf_zero(buf);
if (data == NULL && len) {
if (ibuf_advance(buf, len) == NULL) {
ibuf_free(buf);
return (NULL);
}
} else {
if (ibuf_add(buf, data, len) != 0) {
ibuf_free(buf);
return (NULL);
}
}
return (buf);
}
struct ibuf *
ibuf_static(void)
{
struct ibuf *buf;
if ((buf = ibuf_open(IKED_MSGBUF_MAX)) == NULL)
return (NULL);
ibuf_zero(buf);
return (buf);
}
void *
ibuf_advance(struct ibuf *buf, size_t len)
{
void *ptr;
if ((ptr = ibuf_reserve(buf, len)) != NULL)
memset(ptr, 0, len);
return (ptr);
}
void
ibuf_release(struct ibuf *buf)
{
if (buf == NULL)
return;
if (buf->buf != NULL)
free(buf->buf);
free(buf);
}
size_t
ibuf_length(struct ibuf *buf)
{
if (buf == NULL || buf->buf == NULL)
return (0);
return (ibuf_size(buf));
}
u_int8_t *
ibuf_data(struct ibuf *buf)
{
return (ibuf_seek(buf, 0, 0));
}
void *
ibuf_getdata(struct ibuf *buf, size_t len)
{
void *data;
if ((data = ibuf_seek(buf, buf->rpos, len)) == NULL)
return (NULL);
buf->rpos += len;
return (data);
}
struct ibuf *
ibuf_get(struct ibuf *buf, size_t len)
{
void *data;
if ((data = ibuf_getdata(buf, len)) == NULL)
return (NULL);
return (ibuf_new(data, len));
}
struct ibuf *
ibuf_dup(struct ibuf *buf)
{
if (buf == NULL)
return (NULL);
return (ibuf_new(ibuf_data(buf), ibuf_size(buf)));
}
struct ibuf *
ibuf_random(size_t len)
{
struct ibuf *buf;
void *ptr;
if ((buf = ibuf_open(len)) == NULL)
return (NULL);
if ((ptr = ibuf_reserve(buf, len)) == NULL) {
ibuf_free(buf);
return (NULL);
}
arc4random_buf(ptr, len);
return (buf);
}
int
ibuf_setsize(struct ibuf *buf, size_t len)
{
if (len > buf->size)
return (-1);
buf->wpos = len;
return (0);
}
int
ibuf_prepend(struct ibuf *buf, void *data, size_t len)
{
struct ibuf *new;
/* Swap buffers (we could also use memmove here) */
if ((new = ibuf_new(data, len)) == NULL)
return (-1);
if (ibuf_cat(new, buf) == -1) {
ibuf_release(new);
return (-1);
}
free(buf->buf);
memcpy(buf, new, sizeof(*buf));
free(new);
return (0);
}
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