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/* $OpenBSD: imsg.c,v 1.22 2004/01/22 20:34:56 henning Exp $ */
/*
* Copyright (c) 2003, 2004 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"
int imsg_compose_core(struct imsgbuf *, int, u_int32_t, void *, u_int16_t,
pid_t);
void
imsg_init(struct imsgbuf *ibuf, int sock)
{
msgbuf_init(&ibuf->w);
bzero(&ibuf->r, sizeof(ibuf->r));
ibuf->sock = sock;
ibuf->w.sock = sock;
ibuf->pid = getpid();
}
int
imsg_read(struct imsgbuf *ibuf)
{
ssize_t n;
if ((n = read(ibuf->sock, ibuf->r.buf + ibuf->r.wpos,
sizeof(ibuf->r.buf) - ibuf->r.wpos)) == -1) {
if (errno != EINTR && errno != EAGAIN) {
log_warn("imsg_read: pipe read error");
return (-1);
}
return (0);
}
ibuf->r.wpos += n;
return (n);
}
int
imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
{
ssize_t datalen = 0;
size_t av, left;
av = ibuf->r.wpos;
if (IMSG_HEADER_SIZE > av)
return (0);
memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
if (imsg->hdr.len < IMSG_HEADER_SIZE ||
imsg->hdr.len > MAX_IMSGSIZE) {
log_warnx("imsg_get: imsg hdr len out of bounds");
return (-1);
}
if (imsg->hdr.len > av)
return (0);
datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
if ((imsg->data = malloc(datalen)) == NULL) {
log_warn("imsg_get");
return (-1);
}
memcpy(imsg->data, ibuf->r.rptr, datalen);
if (imsg->hdr.len < av) {
left = av - imsg->hdr.len;
memcpy(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
ibuf->r.wpos = left;
} else
ibuf->r.wpos = 0;
return (datalen + IMSG_HEADER_SIZE);
}
int
imsg_compose(struct imsgbuf *ibuf, int type, u_int32_t peerid, void *data,
u_int16_t dlen)
{
return (imsg_compose_core(ibuf, type, peerid, data, dlen, ibuf->pid));
}
int
imsg_compose_pid(struct imsgbuf *ibuf, int type, pid_t pid, void *data,
u_int16_t datalen)
{
return (imsg_compose_core(ibuf, type, 0, data, datalen, pid));
}
int
imsg_compose_core(struct imsgbuf *ibuf, int type, u_int32_t peerid, void *data,
u_int16_t datalen, pid_t pid)
{
struct buf *wbuf;
struct imsg_hdr hdr;
int n;
hdr.len = datalen + IMSG_HEADER_SIZE;
hdr.type = type;
hdr.peerid = peerid;
hdr.pid = pid;
wbuf = buf_open(hdr.len);
if (wbuf == NULL) {
log_warnx("imsg_compose: buf_open error");
return (-1);
}
if (buf_add(wbuf, &hdr, sizeof(hdr)) == -1) {
log_warnx("imsg_compose: buf_add error");
buf_free(wbuf);
return (-1);
}
if (datalen)
if (buf_add(wbuf, data, datalen) == -1) {
log_warnx("imsg_compose: buf_add error");
buf_free(wbuf);
return (-1);
}
if ((n = buf_close(&ibuf->w, wbuf)) < 0) {
log_warnx("imsg_compose: buf_add error");
buf_free(wbuf);
return (-1);
}
return (n);
}
void
imsg_free(struct imsg *imsg)
{
free(imsg->data);
}
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