File: [local] / src / usr.sbin / relayd / Attic / imsg.c (download)
Revision 1.11, Mon Feb 11 10:42:50 2008 UTC (16 years, 3 months ago) by reyk
Branch: MAIN
CVS Tags: OPENBSD_4_3_BASE, OPENBSD_4_3 Changes since 1.10: +50 -6 lines
Marry relayd with snmpd using new "send trap" option: Request to send
a SNMP trap when the state of a host changes. relayd(8) will try to
(re-)connect to snmpd(8) and request it to send a trap to the
registered trap receivers, see snmpd.conf(5) for more information
about the configuration.
ok pyr@ thib@
|
/* $OpenBSD: imsg.c,v 1.11 2008/02/11 10:42:50 reyk 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/param.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <net/if.h>
#include <errno.h>
#include <event.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include "relayd.h"
void
imsg_init(struct imsgbuf *ibuf, int fd, void (*handler)(int, short, void *))
{
if (!ibuf->pid) {
msgbuf_init(&ibuf->w);
bzero(&ibuf->r, sizeof(ibuf->r));
ibuf->pid = getpid();
ibuf->handler = handler;
TAILQ_INIT(&ibuf->fds);
}
ibuf->fd = fd;
ibuf->w.fd = fd;
}
ssize_t
imsg_read(struct imsgbuf *ibuf)
{
struct msghdr msg;
struct cmsghdr *cmsg;
char cmsgbuf[CMSG_SPACE(sizeof(int) * 16)];
struct iovec iov;
ssize_t n;
int fd;
struct imsg_fd *ifd;
bzero(&msg, sizeof(msg));
iov.iov_base = ibuf->r.buf + ibuf->r.wpos;
iov.iov_len = sizeof(ibuf->r.buf) - ibuf->r.wpos;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf);
if ((n = recvmsg(ibuf->fd, &msg, 0)) == -1) {
if (errno != EINTR && errno != EAGAIN) {
log_warn("imsg_read: pipe read error");
return (-1);
}
return (-2);
}
ibuf->r.wpos += n;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
fd = (*(int *)CMSG_DATA(cmsg));
if ((ifd = calloc(1, sizeof(struct imsg_fd))) == NULL)
fatal("imsg_read calloc");
ifd->fd = fd;
TAILQ_INSERT_TAIL(&ibuf->fds, ifd, entry);
} else
log_warn("imsg_read: got unexpected ctl data level %d "
"type %d", cmsg->cmsg_level, cmsg->cmsg_type);
}
return (n);
}
ssize_t
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, int fd, 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);
wbuf->fd = fd;
if ((n = imsg_close(ibuf, wbuf)) < 0)
return (-1);
return (n);
}
int
imsg_composev(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid,
pid_t pid, int fd, const struct iovec *iov, int iovcnt)
{
struct buf *wbuf;
int n;
int i, datalen = 0;
for (i = 0; i < iovcnt; i++)
datalen += iov[i].iov_len;
if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
return (-1);
for (i = 0; i < iovcnt; i++)
if (imsg_add(wbuf, iov[i].iov_base, iov[i].iov_len) == -1)
return (-1);
wbuf->fd = fd;
if ((n = imsg_close(ibuf, wbuf)) < 0)
return (-1);
return (n);
}
/* ARGSUSED */
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;
datalen += IMSG_HEADER_SIZE;
if (datalen > MAX_IMSGSIZE) {
log_warnx("imsg_create: len %u > MAX_IMSGSIZE; "
"type %u peerid %lu", datalen + IMSG_HEADER_SIZE,
type, peerid);
return (NULL);
}
hdr.type = type;
hdr.peerid = peerid;
if ((hdr.pid = pid) == 0)
hdr.pid = ibuf->pid;
if ((wbuf = buf_dynamic(datalen, MAX_IMSGSIZE)) == 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;
struct imsg_hdr *hdr;
hdr = (struct imsg_hdr *)msg->buf;
hdr->len = (u_int16_t)msg->wpos;
if ((n = buf_close(&ibuf->w, msg)) < 0) {
log_warnx("imsg_close: buf_close error");
buf_free(msg);
return (-1);
}
imsg_event_add(ibuf);
return (n);
}
void
imsg_free(struct imsg *imsg)
{
free(imsg->data);
}
int
imsg_get_fd(struct imsgbuf *ibuf)
{
int fd;
struct imsg_fd *ifd;
if ((ifd = TAILQ_FIRST(&ibuf->fds)) == NULL)
return (-1);
fd = ifd->fd;
TAILQ_REMOVE(&ibuf->fds, ifd, entry);
free(ifd);
return (fd);
}
int
imsg_flush(struct imsgbuf *ibuf)
{
while (ibuf->w.queued)
if (msgbuf_write(&ibuf->w) < 0)
return (-1);
return (0);
}
void
imsg_clear(struct imsgbuf *ibuf)
{
while (ibuf->w.queued)
msgbuf_clear(&ibuf->w);
}