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NetBSD/sbin/routed/parms.c

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/* $NetBSD: parms.c,v 1.2 1996/08/10 01:29:30 thorpej Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if !defined(lint) && !defined(sgi)
#if 0
static char sccsid[] = "@(#)if.c 8.1 (Berkeley) 6/5/93";
#else
static char rcsid[] = "$NetBSD: parms.c,v 1.2 1996/08/10 01:29:30 thorpej Exp $";
#endif
#endif /* not lint */
#include "defs.h"
#include "pathnames.h"
struct parm *parms;
struct intnet *intnets;
/* use configured parameters
*/
void
get_parms(struct interface *ifp)
{
struct parm *parmp;
/* get all relevant parameters
*/
for (parmp = parms; parmp != 0; parmp = parmp->parm_next) {
if ((parmp->parm_name[0] == '\0'
&& on_net(ifp->int_addr,
parmp->parm_addr_h, parmp->parm_mask))
|| (parmp->parm_name[0] != '\0'
&& !strcmp(ifp->int_name, parmp->parm_name))) {
/* this group of parameters is relevant,
* so get its settings
*/
ifp->int_state |= parmp->parm_int_state;
if (parmp->parm_passwd[0] != '\0')
bcopy(parmp->parm_passwd, ifp->int_passwd,
sizeof(ifp->int_passwd));
if (parmp->parm_rdisc_pref != 0)
ifp->int_rdisc_pref = parmp->parm_rdisc_pref;
if (parmp->parm_rdisc_int != 0)
ifp->int_rdisc_int = parmp->parm_rdisc_int;
if (parmp->parm_d_metric != 0)
ifp->int_d_metric = parmp->parm_d_metric;
}
}
/* default poor-man's router discovery to a metric that will
* be heard by old versions of routed.
*/
if ((ifp->int_state & IS_PM_RDISC)
&& ifp->int_d_metric == 0)
ifp->int_d_metric = HOPCNT_INFINITY-2;
if (IS_RIP_IN_OFF(ifp->int_state))
ifp->int_state |= IS_NO_RIP_OUT;
if (ifp->int_rdisc_int == 0)
ifp->int_rdisc_int = DefMaxAdvertiseInterval;
if (!(ifp->int_if_flags & IFF_MULTICAST)
&& !(ifp->int_if_flags & IFF_POINTOPOINT))
ifp->int_state |= IS_NO_RIPV2_OUT;
if (!(ifp->int_if_flags & IFF_MULTICAST))
ifp->int_state |= IS_BCAST_RDISC;
if (ifp->int_if_flags & IFF_POINTOPOINT) {
ifp->int_state |= IS_BCAST_RDISC;
/* By default, point-to-point links should be passive
* about router-discovery for the sake of demand-dialing.
*/
if (0 == (ifp->int_state & GROUP_IS_SOL))
ifp->int_state |= IS_NO_SOL_OUT;
if (0 == (ifp->int_state & GROUP_IS_ADV))
ifp->int_state |= IS_NO_ADV_OUT;
}
if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE)))
ifp->int_state |= IS_NO_RDISC;
if (ifp->int_state & IS_PASSIVE)
ifp->int_state |= (IS_NO_RIP | IS_NO_RDISC);
if ((ifp->int_state&(IS_NO_RIP|IS_NO_RDISC)) == (IS_NO_RIP|IS_NO_RDISC))
ifp->int_state |= IS_PASSIVE;
}
/* Read a list of gateways from /etc/gateways and add them to our tables.
*
* This file contains a list of "remote" gateways. That is usually
* a gateway which we cannot immediately determine if it is present or
* not as we can do for those provided by directly connected hardware.
*
* If a gateway is marked "passive" in the file, then we assume it
* does not understand RIP and assume it is always present. Those
* not marked passive are treated as if they were directly connected
* and assumed to be broken if they do not send us advertisements.
* All remote interfaces are added to our list, and those not marked
* passive are sent routing updates.
*
* A passive interface can also be local, hardware interface exempt
* from RIP.
*/
void
gwkludge(void)
{
FILE *fp;
char *p, *lptr;
char lbuf[200], net_host[5], dname[64+1+64+1], gname[64+1], qual[9];
struct interface *ifp;
naddr dst, netmask, gate;
int metric, n;
u_int state;
char *type;
struct parm *parmp;
fp = fopen(_PATH_GATEWAYS, "r");
if (fp == 0)
return;
for (;;) {
if (0 == fgets(lbuf, sizeof(lbuf)-1, fp))
break;
lptr = lbuf;
while (*lptr == ' ')
lptr++;
if (*lptr == '\n' /* ignore null and comment lines */
|| *lptr == '#')
continue;
p = lptr+strlen(lptr)-1;
while (*p == '\n'
|| *p == ' ')
*p-- = '\0';
/* notice newfangled parameter lines
*/
if (strncasecmp("net", lptr, 3)
&& strncasecmp("host", lptr, 4)) {
p = parse_parms(lptr);
if (p != 0) {
if (strcmp(p,lptr))
msglog("bad \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", lptr, p);
else
msglog("bad \"%s\" in "_PATH_GATEWAYS,
lptr);
}
continue;
}
/* {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */
n = sscanf(lptr, "%4s %129[^ \t] gateway"
" %64[^ / \t] metric %d %8s\n",
net_host, dname, gname, &metric, qual);
if (n != 5) {
msglog("bad "_PATH_GATEWAYS" entry \"%s\"", lptr);
continue;
}
if (metric < 0 || metric >= HOPCNT_INFINITY) {
msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"",
lptr);
continue;
}
if (!strcmp(net_host, "host")) {
if (!gethost(dname, &dst)) {
msglog("bad host \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", dname, lptr);
continue;
}
netmask = HOST_MASK;
} else if (!strcmp(net_host, "net")) {
if (!getnet(dname, &dst, &netmask)) {
msglog("bad net \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", dname, lptr);
continue;
}
} else {
msglog("bad \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", lptr);
continue;
}
if (!gethost(gname, &gate)) {
msglog("bad gateway \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", gname, lptr);
continue;
}
if (strcmp(qual, type = "passive") == 0) {
/* Passive entries are not placed in our tables,
* only the kernel's, so we don't copy all of the
* external routing information within a net.
* Internal machines should use the default
* route to a suitable gateway (like us).
*/
state = IS_REMOTE | IS_PASSIVE;
if (metric == 0)
metric = 1;
} else if (strcmp(qual, type = "external") == 0) {
/* External entries are handled by other means
* such as EGP, and are placed only in the daemon
* tables to prevent overriding them with something
* else.
*/
state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL;
if (metric == 0)
metric = 1;
} else if (qual[0] == '\0') {
if (metric != 0) {
/* Entries that are neither "passive" nor
* "external" are "remote" and must behave
* like physical interfaces. If they are not
* heard from regularly, they are deleted.
*/
state = IS_REMOTE;
type = "remote";
} else {
/* "remote" entries with a metric of 0
* are aliases for our own interfaces
*/
state = IS_REMOTE | IS_PASSIVE;
type = "alias";
}
} else {
msglog("bad "_PATH_GATEWAYS" entry \"%s\"", lptr);
continue;
}
/* Remember to advertise the corresponding logical network.
*/
if (!(state & IS_EXTERNAL)
&& netmask != std_mask(dst))
state |= IS_SUBNET;
if (0 != (state & (IS_PASSIVE | IS_REMOTE)))
state |= IS_NO_RDISC;
if (state & IS_PASSIVE)
state |= (IS_NO_RIP | IS_NO_RDISC);
if ((state & (IS_NO_RIP|IS_NO_RDISC)) ==
(IS_NO_RIP|IS_NO_RDISC))
state |= IS_PASSIVE;
parmp = (struct parm*)malloc(sizeof(*parmp));
bzero(parmp, sizeof(*parmp));
parmp->parm_next = parms;
parms = parmp;
parmp->parm_addr_h = ntohl(dst);
parmp->parm_mask = -1;
parmp->parm_d_metric = 0;
parmp->parm_int_state = state;
/* See if this new interface duplicates an existing
* interface.
*/
for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
if (ifp->int_mask == netmask
&& ((ifp->int_addr == dst
&& netmask != HOST_MASK)
|| (ifp->int_dstaddr == dst
&& netmask == HOST_MASK)))
break;
}
if (ifp != 0) {
/* Let one of our real interfaces be marked passive.
*/
if ((state & IS_PASSIVE) && !(state & IS_EXTERNAL)) {
ifp->int_state |= state;
} else {
msglog("%s is duplicated in "_PATH_GATEWAYS
" by %s",
ifp->int_name, lptr);
}
continue;
}
tot_interfaces++;
ifp = (struct interface *)malloc(sizeof(*ifp));
bzero(ifp, sizeof(*ifp));
if (ifnet != 0) {
ifp->int_next = ifnet;
ifnet->int_prev = ifp;
}
ifnet = ifp;
ifp->int_state = state;
ifp->int_net = ntohl(dst) & netmask;
ifp->int_mask = netmask;
if (netmask == HOST_MASK)
ifp->int_if_flags |= IFF_POINTOPOINT;
ifp->int_dstaddr = dst;
ifp->int_addr = gate;
ifp->int_metric = metric;
(void)sprintf(ifp->int_name, "%s-%s", type, naddr_ntoa(dst));
ifp->int_index = -1;
get_parms(ifp);
trace_if("Add", ifp);
}
}
/* parse a set of parameters for an interface
*/
char * /* 0 or error message */
parse_parms(char *line)
{
#define PARS(str) (0 == (tgt = str, strcasecmp(tok, tgt)))
#define PARSE(str) (0 == (tgt = str, strncasecmp(tok, str "=", sizeof(str))))
#define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \
parm.parm_int_state |= (b);}
#define DELIMS " ,\t\n"
struct parm parm;
struct intnet *intnetp;
char *tok, *tgt, *p;
/* "subnet=x.y.z.u/mask" must be alone on the line */
if (!strncasecmp("subnet=",line,7)) {
intnetp = (struct intnet*)malloc(sizeof(*intnetp));
intnetp->intnet_metric = 1;
if ((p = strrchr(line,','))) {
*p++ = '\0';
intnetp->intnet_metric = (int)strtol(p,&p,0);
if (*p != '\0'
|| intnetp->intnet_metric <= 0
|| intnetp->intnet_metric >= HOPCNT_INFINITY)
return line;
}
if (!getnet(&line[7], &intnetp->intnet_addr,
&intnetp->intnet_mask)
|| intnetp->intnet_mask == HOST_MASK
|| intnetp->intnet_addr == RIP_DEFAULT) {
free(intnetp);
return line;
}
intnetp->intnet_next = intnets;
intnets = intnetp;
return 0;
}
bzero(&parm, sizeof(parm));
tgt = "null";
for (tok = strtok(line, DELIMS);
tok != 0 && tok[0] != '\0';
tgt = 0, tok = strtok(0,DELIMS)) {
if (PARSE("if")) {
if (parm.parm_name[0] != '\0'
|| tok[3] == '\0'
|| strlen(tok) > IFNAMSIZ+3)
break;
strcpy(parm.parm_name, tok+3);
} else if (PARSE("passwd")) {
if (tok[7] == '\0'
|| strlen(tok) > RIP_AUTH_PW_LEN+7)
break;
strcpy(parm.parm_passwd, tok+7);
} else if (PARS("no_ag")) {
parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG);
} else if (PARS("no_super_ag")) {
parm.parm_int_state |= IS_NO_SUPER_AG;
} else if (PARS("no_ripv1_in")) {
parm.parm_int_state |= IS_NO_RIPV1_IN;
} else if (PARS("no_ripv2_in")) {
parm.parm_int_state |= IS_NO_RIPV2_IN;
} else if (PARS("ripv2_out")) {
if (parm.parm_int_state & IS_NO_RIPV2_OUT)
break;
parm.parm_int_state |= IS_NO_RIPV1_OUT;
} else if (PARS("no_rip")) {
parm.parm_int_state |= IS_NO_RIP;
} else if (PARS("no_rdisc")) {
CKF((GROUP_IS_SOL|GROUP_IS_ADV), IS_NO_RDISC);
} else if (PARS("no_solicit")) {
CKF(GROUP_IS_SOL, IS_NO_SOL_OUT);
} else if (PARS("send_solicit")) {
CKF(GROUP_IS_SOL, IS_SOL_OUT);
} else if (PARS("no_rdisc_adv")) {
CKF(GROUP_IS_ADV, IS_NO_ADV_OUT);
} else if (PARS("rdisc_adv")) {
CKF(GROUP_IS_ADV, IS_ADV_OUT);
} else if (PARS("bcast_rdisc")) {
parm.parm_int_state |= IS_BCAST_RDISC;
} else if (PARS("passive")) {
CKF((GROUP_IS_SOL|GROUP_IS_ADV), IS_NO_RDISC);
parm.parm_int_state |= IS_NO_RIP;
} else if (PARSE("rdisc_pref")) {
if (parm.parm_rdisc_pref != 0
|| tok[11] == '\0'
|| (parm.parm_rdisc_pref = (int)strtol(&tok[11],
&p,0),
*p != '\0'))
break;
} else if (PARS("pm_rdisc")) {
parm.parm_int_state |= IS_PM_RDISC;
} else if (PARSE("rdisc_interval")) {
if (parm.parm_rdisc_int != 0
|| tok[15] == '\0'
|| (parm.parm_rdisc_int = (int)strtol(&tok[15],
&p,0),
*p != '\0')
|| parm.parm_rdisc_int < MinMaxAdvertiseInterval
|| parm.parm_rdisc_int > MaxMaxAdvertiseInterval)
break;
} else if (PARSE("fake_default")) {
if (parm.parm_d_metric != 0
|| tok[13] == '\0'
|| (parm.parm_d_metric=(int)strtol(&tok[13],&p,0),
*p != '\0')
|| parm.parm_d_metric > HOPCNT_INFINITY-1)
break;
} else {
tgt = tok;
break;
}
}
if (tgt != 0)
return tgt;
if (parm.parm_int_state & IS_NO_ADV_IN)
parm.parm_int_state |= IS_NO_SOL_OUT;
if ((parm.parm_int_state & (IS_NO_RIP | IS_NO_RDISC))
== (IS_NO_RIP | IS_NO_RDISC))
parm.parm_int_state |= IS_PASSIVE;
return check_parms(&parm);
#undef DELIMS
#undef PARS
#undef PARSE
}
/* check for duplicate parameter specifications */
char * /* 0 or error message */
check_parms(struct parm *new)
{
struct parm *parmp;
for (parmp = parms; parmp != 0; parmp = parmp->parm_next) {
if (strcmp(new->parm_name, parmp->parm_name))
continue;
if (!on_net(htonl(parmp->parm_addr_h),
new->parm_addr_h, new->parm_mask)
&& !on_net(htonl(new->parm_addr_h),
parmp->parm_addr_h, parmp->parm_mask))
continue;
if (strcmp(parmp->parm_passwd, new->parm_passwd)
|| (0 != (new->parm_int_state & GROUP_IS_SOL)
&& 0 != (parmp->parm_int_state & GROUP_IS_SOL)
&& 0 != ((new->parm_int_state ^ parmp->parm_int_state)
&& GROUP_IS_SOL))
|| (0 != (new->parm_int_state & GROUP_IS_ADV)
&& 0 != (parmp->parm_int_state & GROUP_IS_ADV)
&& 0 != ((new->parm_int_state ^ parmp->parm_int_state)
&& GROUP_IS_ADV))
|| (new->parm_rdisc_pref != 0
&& parmp->parm_rdisc_pref != 0
&& new->parm_rdisc_pref != parmp->parm_rdisc_pref)
|| (new->parm_rdisc_int != 0
&& parmp->parm_rdisc_int != 0
&& new->parm_rdisc_int != parmp->parm_rdisc_int)
|| (new->parm_d_metric != 0
&& parmp->parm_d_metric != 0
&& new->parm_d_metric != parmp->parm_d_metric))
return "duplicate";
}
parmp = (struct parm*)malloc(sizeof(*parmp));
bcopy(new, parmp, sizeof(*parmp));
parmp->parm_next = parms;
parms = parmp;
return 0;
}
/* get a network number as a name or a number, with an optional "/xx"
* netmask.
*/
int /* 0=bad */
getnet(char *name,
naddr *addrp, /* host byte order */
naddr *maskp)
{
int i;
struct netent *np;
naddr mask;
struct in_addr in;
char hname[MAXHOSTNAMELEN+1];
char *mname, *p;
/* Detect and separate "1.2.3.4/24"
*/
if (0 != (mname = rindex(name,'/'))) {
i = (int)(mname - name);
if (i > sizeof(hname)-1) /* name too long */
return 0;
bcopy(name, hname, i);
hname[i] = '\0';
mname++;
name = hname;
}
np = getnetbyname(name);
if (np != 0) {
in.s_addr = (naddr)np->n_net;
} else if (inet_aton(name, &in) == 1) {
HTONL(in.s_addr);
} else {
return 0;
}
if (mname == 0) {
/* we cannot use the interfaces here because we have not
* looked at them yet.
*/
mask = std_mask(in.s_addr);
if ((~mask & ntohl(in.s_addr)) != 0)
mask = HOST_MASK;
} else {
mask = (naddr)strtoul(mname, &p, 0);
if (*p != '\0' || mask > 32)
return 0;
mask = HOST_MASK << (32-mask);
}
if (mask != 0 && in.s_addr == RIP_DEFAULT)
return 0;
if ((~mask & ntohl(in.s_addr)) != 0)
return 0;
*addrp = in.s_addr;
*maskp = mask;
return 1;
}
int /* 0=bad */
gethost(char *name,
naddr *addrp)
{
struct hostent *hp;
struct in_addr in;
/* Try for a number first, even in IRIX where gethostbyname()
* is smart. This avoids hitting the name server which
* might be sick because routing is.
*/
if (inet_aton(name, &in) == 1) {
*addrp = in.s_addr;
return 1;
}
hp = gethostbyname(name);
if (hp) {
bcopy(hp->h_addr, addrp, sizeof(*addrp));
return 1;
}
return 0;
}
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