/*  $OpenBSD: imsg_util.c,v 1.21 2023/07/18 15:07:41 claudio 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

 */

struct ibuf *

ibuf_new(const void *data, size_t len)

{

  struct ibuf *buf;

  if ((buf = ibuf_dynamic(len,

      IKED_MSGBUF_MAX)) == NULL)

    return (NULL);

  if (len == 0)

    return (buf);

  if (data == NULL) {

    if (ibuf_add_zero(buf, len) != 0) {

      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)

{

  return ibuf_open(IKED_MSGBUF_MAX);

}

size_t

ibuf_length(struct ibuf *buf)

{

  if (buf == NULL)

    return (0);

  return (ibuf_size(buf));

}

struct ibuf *

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 (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);

}