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/* $OpenBSD: imsg.c,v 1.4 2003/12/20 21:14:55 henning Exp $ */
/*
* Copyright (c) 2003 Henning Brauer <henning@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/types.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bgpd.h"
static struct imsg_buf_read buf;
void
init_imsg_buf(void)
{
bzero(&buf, sizeof(buf));
buf.wptr = buf.buf;
buf.pkt_len = IMSG_HEADER_SIZE;
}
int
get_imsg(int fd, struct imsg *imsg)
{
struct imsg_hdr *hdr;
ssize_t n, read_total = 0, datalen = 0;
u_char *rptr;
do {
if ((n = read(fd, buf.wptr, buf.pkt_len - buf.read_len)) ==
-1) {
if (errno != EAGAIN && errno != EINTR)
fatal("pipe read error", errno);
return (0);
}
read_total += n;
buf.wptr += n;
buf.read_len += n;
if (buf.read_len == buf.pkt_len) {
if (!buf.seen_hdr) { /* got header */
hdr = (struct imsg_hdr *)&buf.buf;
buf.type = hdr->type;
buf.pkt_len = hdr->len;
buf.peerid = hdr->peerid;
if (hdr->len < IMSG_HEADER_SIZE ||
hdr->len > MAX_IMSGSIZE)
fatal("wrong imsg header len", 0);
buf.seen_hdr = 1;
} else { /* we got the full packet */
imsg->hdr.type = buf.type;
imsg->hdr.len = buf.pkt_len;
imsg->hdr.peerid = buf.peerid;
datalen = buf.pkt_len - IMSG_HEADER_SIZE;
rptr = buf.buf + IMSG_HEADER_SIZE;
if ((imsg->data = malloc(datalen)) == NULL)
fatal("get_imsg malloc", errno);
memcpy(imsg->data, rptr, datalen);
n = 0; /* give others a chance */
init_imsg_buf();
}
}
} while (n > 0);
if (read_total == 0) /* connection closed */
return (0);
return (datalen + IMSG_HEADER_SIZE);
}
int
imsg_compose(int fd, int type, u_int32_t peerid, u_char *data,
u_int16_t datalen)
{
struct buf *wbuf;
struct imsg_hdr hdr;
int n;
hdr.len = datalen + IMSG_HEADER_SIZE;
hdr.type = type;
hdr.peerid = peerid;
wbuf = buf_open(NULL, fd, hdr.len);
if (wbuf == NULL)
fatal("buf_open error", 0);
if (buf_add(wbuf, &hdr, sizeof(hdr)) == -1)
fatal("buf_add error", 0);
if (datalen)
if (buf_add(wbuf, data, datalen) == -1)
fatal("buf_add error", 0);
if ((n = buf_close(wbuf)) == -1)
fatal("buf_close error", 0);
return (n);
}
void
imsg_free(struct imsg *imsg)
{
free(imsg->data);
}
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