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480 lines
8.3 KiB
C
480 lines
8.3 KiB
C
/*
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* Packet interface
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* Copyright (C) 1999 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <zebra.h>
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#include "stream.h"
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#include "memory.h"
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#include "network.h"
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#include "prefix.h"
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/*A macro to check pointers in order to not
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go behind the allocated mem block
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S -- stream reference
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Z -- size of data to be written
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*/
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#define CHECK_SIZE(S, Z) \
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if (((S)->putp + (Z)) > (S)->size) \
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(Z) = (S)->size - (S)->putp;
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/* Stream is fixed length buffer for network output/input. */
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/* Make stream buffer. */
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struct stream *
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stream_new (size_t size)
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{
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struct stream *s;
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s = XCALLOC (MTYPE_STREAM, sizeof (struct stream));
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s->data = XCALLOC (MTYPE_STREAM_DATA, size);
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s->size = size;
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return s;
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}
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/* Free it now. */
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void
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stream_free (struct stream *s)
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{
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XFREE (MTYPE_STREAM_DATA, s->data);
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XFREE (MTYPE_STREAM, s);
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}
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unsigned long
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stream_get_getp (struct stream *s)
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{
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return s->getp;
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}
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unsigned long
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stream_get_putp (struct stream *s)
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{
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return s->putp;
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}
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unsigned long
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stream_get_endp (struct stream *s)
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{
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return s->endp;
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}
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unsigned long
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stream_get_size (struct stream *s)
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{
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return s->size;
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}
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/* Stream structre' stream pointer related functions. */
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void
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stream_set_getp (struct stream *s, unsigned long pos)
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{
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s->getp = pos;
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}
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void
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stream_set_putp (struct stream *s, unsigned long pos)
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{
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s->putp = pos;
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}
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/* Forward pointer. */
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void
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stream_forward (struct stream *s, int size)
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{
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s->getp += size;
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}
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/* Copy from stream to destination. */
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void
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stream_get (void *dst, struct stream *s, size_t size)
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{
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memcpy (dst, s->data + s->getp, size);
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s->getp += size;
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}
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/* Get next character from the stream. */
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u_char
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stream_getc (struct stream *s)
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{
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u_char c;
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c = s->data[s->getp];
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s->getp++;
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return c;
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}
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/* Get next character from the stream. */
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u_char
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stream_getc_from (struct stream *s, unsigned long from)
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{
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u_char c;
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c = s->data[from];
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return c;
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}
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/* Get next word from the stream. */
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u_int16_t
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stream_getw (struct stream *s)
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{
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u_int16_t w;
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w = s->data[s->getp++] << 8;
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w |= s->data[s->getp++];
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return w;
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}
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/* Get next word from the stream. */
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u_int16_t
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stream_getw_from (struct stream *s, unsigned long from)
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{
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u_int16_t w;
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w = s->data[from++] << 8;
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w |= s->data[from];
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return w;
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}
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/* Get next long word from the stream. */
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u_int32_t
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stream_getl (struct stream *s)
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{
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u_int32_t l;
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l = s->data[s->getp++] << 24;
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l |= s->data[s->getp++] << 16;
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l |= s->data[s->getp++] << 8;
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l |= s->data[s->getp++];
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return l;
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}
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/* Get next long word from the stream. */
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u_int32_t
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stream_get_ipv4 (struct stream *s)
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{
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u_int32_t l;
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memcpy (&l, s->data + s->getp, 4);
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s->getp += 4;
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return l;
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}
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/* Copy to source to stream. */
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void
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stream_put (struct stream *s, void *src, size_t size)
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{
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CHECK_SIZE(s, size);
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if (src)
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memcpy (s->data + s->putp, src, size);
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else
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memset (s->data + s->putp, 0, size);
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s->putp += size;
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if (s->putp > s->endp)
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s->endp = s->putp;
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}
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/* Put character to the stream. */
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int
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stream_putc (struct stream *s, u_char c)
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{
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if (s->putp >= s->size) return 0;
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s->data[s->putp] = c;
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s->putp++;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return 1;
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}
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/* Put word to the stream. */
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int
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stream_putw (struct stream *s, u_int16_t w)
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{
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if ((s->size - s->putp) < 2) return 0;
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s->data[s->putp++] = (u_char)(w >> 8);
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s->data[s->putp++] = (u_char) w;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return 2;
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}
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/* Put long word to the stream. */
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int
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stream_putl (struct stream *s, u_int32_t l)
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{
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if ((s->size - s->putp) < 4) return 0;
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s->data[s->putp++] = (u_char)(l >> 24);
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s->data[s->putp++] = (u_char)(l >> 16);
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s->data[s->putp++] = (u_char)(l >> 8);
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s->data[s->putp++] = (u_char)l;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return 4;
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}
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int
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stream_putc_at (struct stream *s, unsigned long putp, u_char c)
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{
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s->data[putp] = c;
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return 1;
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}
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int
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stream_putw_at (struct stream *s, unsigned long putp, u_int16_t w)
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{
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s->data[putp] = (u_char)(w >> 8);
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s->data[putp + 1] = (u_char) w;
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return 2;
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}
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int
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stream_putl_at (struct stream *s, unsigned long putp, u_int32_t l)
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{
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s->data[putp] = (u_char)(l >> 24);
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s->data[putp + 1] = (u_char)(l >> 16);
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s->data[putp + 2] = (u_char)(l >> 8);
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s->data[putp + 3] = (u_char)l;
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return 4;
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}
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/* Put long word to the stream. */
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int
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stream_put_ipv4 (struct stream *s, u_int32_t l)
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{
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if ((s->size - s->putp) < 4)
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return 0;
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memcpy (s->data + s->putp, &l, 4);
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s->putp += 4;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return 4;
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}
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/* Put long word to the stream. */
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int
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stream_put_in_addr (struct stream *s, struct in_addr *addr)
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{
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if ((s->size - s->putp) < 4)
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return 0;
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memcpy (s->data + s->putp, addr, 4);
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s->putp += 4;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return 4;
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}
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/* Put prefix by nlri type format. */
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int
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stream_put_prefix (struct stream *s, struct prefix *p)
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{
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u_char psize;
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psize = PSIZE (p->prefixlen);
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if ((s->size - s->putp) < psize) return 0;
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stream_putc (s, p->prefixlen);
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memcpy (s->data + s->putp, &p->u.prefix, psize);
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s->putp += psize;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return psize;
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}
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/* Read size from fd. */
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int
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stream_read (struct stream *s, int fd, size_t size)
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{
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int nbytes;
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nbytes = readn (fd, s->data + s->putp, size);
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if (nbytes > 0)
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{
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s->putp += nbytes;
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s->endp += nbytes;
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}
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return nbytes;
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}
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/* Read size from fd. */
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int
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stream_read_unblock (struct stream *s, int fd, size_t size)
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{
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int nbytes;
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int val;
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val = fcntl (fd, F_GETFL, 0);
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fcntl (fd, F_SETFL, val|O_NONBLOCK);
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nbytes = read (fd, s->data + s->putp, size);
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fcntl (fd, F_SETFL, val);
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if (nbytes > 0)
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{
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s->putp += nbytes;
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s->endp += nbytes;
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}
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return nbytes;
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}
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/* Write data to buffer. */
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int
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stream_write (struct stream *s, u_char *ptr, size_t size)
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{
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CHECK_SIZE(s, size);
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memcpy (s->data + s->putp, ptr, size);
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s->putp += size;
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if (s->putp > s->endp)
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s->endp = s->putp;
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return size;
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}
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/* Return current read pointer. */
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u_char *
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stream_pnt (struct stream *s)
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{
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return s->data + s->getp;
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}
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/* Check does this stream empty? */
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int
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stream_empty (struct stream *s)
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{
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if (s->putp == 0 && s->endp == 0 && s->getp == 0)
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return 1;
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else
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return 0;
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}
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/* Reset stream. */
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void
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stream_reset (struct stream *s)
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{
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s->putp = 0;
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s->endp = 0;
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s->getp = 0;
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}
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/* Write stream contens to the file discriptor. */
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int
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stream_flush (struct stream *s, int fd)
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{
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int nbytes;
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nbytes = write (fd, s->data + s->getp, s->endp - s->getp);
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return nbytes;
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}
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/* Stream first in first out queue. */
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struct stream_fifo *
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stream_fifo_new ()
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{
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struct stream_fifo *new;
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new = XCALLOC (MTYPE_STREAM_FIFO, sizeof (struct stream_fifo));
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return new;
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}
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/* Add new stream to fifo. */
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void
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stream_fifo_push (struct stream_fifo *fifo, struct stream *s)
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{
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if (fifo->tail)
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fifo->tail->next = s;
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else
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fifo->head = s;
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fifo->tail = s;
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fifo->count++;
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}
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/* Delete first stream from fifo. */
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struct stream *
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stream_fifo_pop (struct stream_fifo *fifo)
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{
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struct stream *s;
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s = fifo->head;
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if (s)
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{
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fifo->head = s->next;
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if (fifo->head == NULL)
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fifo->tail = NULL;
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}
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fifo->count--;
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return s;
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}
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/* Return first fifo entry. */
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struct stream *
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stream_fifo_head (struct stream_fifo *fifo)
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{
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return fifo->head;
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}
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void
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stream_fifo_clean (struct stream_fifo *fifo)
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{
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struct stream *s;
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struct stream *next;
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for (s = fifo->head; s; s = next)
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{
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next = s->next;
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stream_free (s);
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}
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fifo->head = fifo->tail = NULL;
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fifo->count = 0;
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}
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void
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stream_fifo_free (struct stream_fifo *fifo)
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{
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stream_fifo_clean (fifo);
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XFREE (MTYPE_STREAM_FIFO, fifo);
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}
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