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/* $OpenBSD: imsg.c,v 1.8 2003/12/21 23:28:39 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"
void imsg_init_readbuf(struct imsgbuf *);
void
imsg_init_readbuf(struct imsgbuf *ibuf)
{
bzero(&ibuf->r, sizeof(ibuf->r));
ibuf->r.wptr = ibuf->r.buf;
ibuf->r.pkt_len = IMSG_HEADER_SIZE;
}
void
imsg_init(struct imsgbuf *ibuf, int sock)
{
imsg_init_readbuf(ibuf);
msgbuf_init(&ibuf->w);
ibuf->sock = sock;
ibuf->w.sock = sock;
}
int
imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
{
struct imsg_hdr *hdr;
ssize_t n, read_total = 0, datalen = 0;
u_char *rptr;
do {
if ((n = read(ibuf->sock, ibuf->r.wptr,
ibuf->r.pkt_len - ibuf->r.read_len)) == -1) {
if (errno != EAGAIN && errno != EINTR)
fatal("pipe read error", errno);
return (0);
}
read_total += n;
ibuf->r.wptr += n;
ibuf->r.read_len += n;
if (ibuf->r.read_len == ibuf->r.pkt_len) {
if (!ibuf->r.seen_hdr) { /* got header */
hdr = (struct imsg_hdr *)&ibuf->r.buf;
ibuf->r.type = hdr->type;
ibuf->r.pkt_len = hdr->len;
ibuf->r.peerid = hdr->peerid;
if (hdr->len < IMSG_HEADER_SIZE ||
hdr->len > MAX_IMSGSIZE)
fatal("wrong imsg header len", 0);
ibuf->r.seen_hdr = 1;
} else { /* we got the full packet */
imsg->hdr.type = ibuf->r.type;
imsg->hdr.len = ibuf->r.pkt_len;
imsg->hdr.peerid = ibuf->r.peerid;
datalen = ibuf->r.pkt_len - IMSG_HEADER_SIZE;
rptr = ibuf->r.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 */
imsg_init_readbuf(ibuf);
}
}
} while (n > 0);
if (read_total == 0) /* connection closed */
return (0);
return (datalen + IMSG_HEADER_SIZE);
}
int
imsg_compose(struct imsgbuf *ibuf, int type, u_int32_t peerid, void *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(hdr.len);
if (wbuf == NULL)
fatal("imsg_compose: buf_open error", 0);
if (buf_add(wbuf, &hdr, sizeof(hdr)) == -1)
fatal("imsg_compose: buf_add error", 0);
if (datalen)
if (buf_add(wbuf, data, datalen) == -1)
fatal("imsg_compose: buf_add error", 0);
if ((n = buf_close(&ibuf->w, wbuf)) == -1)
fatal("imsg_compose: buf_close error", 0);
return (n);
}
void
imsg_free(struct imsg *imsg)
{
free(imsg->data);
}
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