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/* $OpenBSD: privsep.c,v 1.71 2017/09/20 19:21:00 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 <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;
size_t sz;
int index, newidx, retries;
index = if_nametoindex(name);
if (index == 0) {
log_warnx("%s: unknown interface", log_procname);
quit = INTERNALSIG;
return;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_DELETE_ADDRESS:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_delete_address))
log_warnx("%s: bad IMSG_DELETE_ADDRESS",
log_procname);
else
priv_delete_address(name, ioctlfd, imsg.data);
break;
case IMSG_SET_ADDRESS:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_set_address))
log_warnx("%s: bad IMSG_SET_ADDRESS",
log_procname);
else
priv_set_address(name, ioctlfd, imsg.data);
break;
case IMSG_FLUSH_ROUTES:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_flush_routes))
log_warnx("%s: bad IMSG_FLUSH_ROUTES",
log_procname);
else
priv_flush_routes(index, routefd, rdomain,
imsg.data);
break;
case IMSG_ADD_ROUTE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_add_route))
log_warnx("%s: bad IMSG_ADD_ROUTE",
log_procname);
else
priv_add_route(name, rdomain, routefd,
imsg.data);
break;
case IMSG_SET_MTU:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct imsg_set_mtu))
log_warnx("%s: bad IMSG_SET_MTU", log_procname);
else
priv_set_mtu(name, ioctlfd, imsg.data);
break;
case IMSG_SET_RESOLV_CONF:
if (imsg.hdr.len < IMSG_HEADER_SIZE)
log_warnx("%s: bad IMSG_SET_RESOLV_CONF",
log_procname);
else {
free(resolv_conf);
resolv_conf = NULL;
sz = imsg.hdr.len - IMSG_HEADER_SIZE;
if (sz > 0) {
resolv_conf = malloc(sz);
if (resolv_conf == NULL)
log_warn("%s: resolv_conf",
log_procname);
else
strlcpy(resolv_conf,
imsg.data, sz);
}
lastidx = 0;
}
break;
case IMSG_WRITE_RESOLV_CONF:
if (imsg.hdr.len != IMSG_HEADER_SIZE)
log_warnx("%s: bad IMSG_WRITE_RESOLV_CONF",
log_procname);
else {
retries = 0;
do {
newidx = default_route_index(rdomain,
routefd);
retries++;
} while (newidx == 0 && retries < 3);
if (newidx == index && newidx != lastidx)
priv_write_resolv_conf(resolv_conf);
lastidx = newidx;
}
break;
case IMSG_HUP:
if (imsg.hdr.len != IMSG_HEADER_SIZE)
log_warnx("%s: bad IMSG_HUP", log_procname);
else
quit = SIGHUP;
break;
default:
log_warnx("%s: received unknown message, code %u",
log_procname, imsg.hdr.type);
}
imsg_free(&imsg);
}
}
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