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/* $OpenBSD: imsg.c,v 1.12 2007/03/19 10:03:25 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 MIND, 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 "ntpd.h"
void
imsg_init(struct imsgbuf *ibuf, int fd)
{
msgbuf_init(&ibuf->w);
bzero(&ibuf->r, sizeof(ibuf->r));
ibuf->fd = fd;
ibuf->w.fd = fd;
ibuf->pid = getpid();
}
int
imsg_read(struct imsgbuf *ibuf)
{
ssize_t n;
if ((n = read(ibuf->fd, 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 (-2);
}
ibuf->r.wpos += n;
return (n);
}
int
imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
{
size_t av, left, datalen;
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 %u out of bounds, type=%u",
imsg->hdr.len, imsg->hdr.type);
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;
memmove(&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, enum imsg_type type, u_int32_t peerid,
pid_t pid, void *data, u_int16_t datalen)
{
struct buf *wbuf;
int n;
if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
return (-1);
if (imsg_add(wbuf, data, datalen) == -1)
return (-1);
if ((n = imsg_close(ibuf, wbuf)) < 0)
return (-1);
return (n);
}
struct buf *
imsg_create(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid,
pid_t pid, u_int16_t datalen)
{
struct buf *wbuf;
struct imsg_hdr hdr;
if (datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
log_warnx("imsg_create: len %u > MAX_IMSGSIZE; "
"type %u peerid %lu", datalen + IMSG_HEADER_SIZE,
type, peerid);
return (NULL);
}
hdr.len = datalen + IMSG_HEADER_SIZE;
hdr.type = type;
hdr.peerid = peerid;
hdr.pid = pid;
if ((wbuf = buf_open(hdr.len)) == NULL) {
log_warn("imsg_create: buf_open");
return (NULL);
}
if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
return (NULL);
return (wbuf);
}
int
imsg_add(struct buf *msg, void *data, u_int16_t datalen)
{
if (datalen)
if (buf_add(msg, data, datalen) == -1) {
log_warnx("imsg_add: buf_add error");
buf_free(msg);
return (-1);
}
return (datalen);
}
int
imsg_close(struct imsgbuf *ibuf, struct buf *msg)
{
int n;
if ((n = buf_close(&ibuf->w, msg)) < 0) {
log_warnx("imsg_close: buf_close error");
buf_free(msg);
return (-1);
}
return (n);
}
void
imsg_free(struct imsg *imsg)
{
free(imsg->data);
}
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