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/* $OpenBSD: privsep.c,v 1.76 2019/11/19 14:35:08 krw Exp $ */
/*
* Copyright (c) 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, ABUSE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <errno.h>
#include <imsg.h>
#include <resolv.h>
#include <signal.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "log.h"
#include "privsep.h"
void
dispatch_imsg(char *name, int rdomain, int ioctlfd, int routefd,
struct imsgbuf *ibuf)
{
static char *resolv_conf;
static int lastidx;
struct imsg imsg;
ssize_t n;
int index;
index = if_nametoindex(name);
if (index == 0) {
log_warnx("%s: unknown interface", log_procname);
quit = TERMINATE;
return;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_REVOKE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_revoke))
log_warnx("%s: bad IMSG_REVOKE",
log_procname);
else
priv_revoke_proposal(name, ioctlfd, imsg.data,
&resolv_conf);
break;
case IMSG_PROPOSE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_propose))
log_warnx("%s: bad IMSG_PROPOSE",
log_procname);
else {
priv_propose(name, ioctlfd, imsg.data,
&resolv_conf, routefd, rdomain, index);
lastidx = 0; /* Next IMSG_WRITE_RESOLV_CONF */
}
break;
case IMSG_WRITE_RESOLV_CONF:
if (imsg.hdr.len != IMSG_HEADER_SIZE)
log_warnx("%s: bad IMSG_WRITE_RESOLV_CONF",
log_procname);
else
priv_write_resolv_conf(index, routefd, rdomain,
resolv_conf, &lastidx);
break;
case IMSG_TELL_UNWIND:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_tell_unwind))
log_warnx("%s: bad IMSG_TELL_UNWIND",
log_procname);
else
priv_tell_unwind(index, routefd, rdomain, imsg.data);
break;
default:
log_warnx("%s: received unknown message, code %u",
log_procname, imsg.hdr.type);
}
imsg_free(&imsg);
}
}
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