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freebsd/sbin/routed/parms.c
Warner Losh fbbd9655e5 Renumber copyright clause 4 
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

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/*
* 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. 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.
*
* $FreeBSD$
*/
#include "defs.h"
#include "pathnames.h"
#include <sys/stat.h>
#ifdef __NetBSD__
__RCSID("$NetBSD$");
#elif defined(__FreeBSD__)
__RCSID("$FreeBSD$");
#else
__RCSID("$Revision: 2.26 $");
#ident "$Revision: 2.26 $"
#endif
static struct parm *parms;
struct intnet *intnets;
struct r1net *r1nets;
struct tgate *tgates;
/* use configured parameters
*/
void
get_parms(struct interface *ifp)
{
static int warned_auth_in, warned_auth_out;
struct parm *parmp;
int i, num_passwds = 0;
/* get all relevant parameters
*/
for (parmp = parms; parmp != NULL; parmp = parmp->parm_next) {
if (parmp->parm_name[0] == '\0'
|| !strcmp(ifp->int_name, parmp->parm_name)
|| (parmp->parm_name[0] == '\n'
&& on_net(ifp->int_addr,
parmp->parm_net, parmp->parm_mask))) {
/* This group of parameters is relevant,
* so get its settings
*/
ifp->int_state |= parmp->parm_int_state;
for (i = 0; i < MAX_AUTH_KEYS; i++) {
if (parmp->parm_auth[0].type == RIP_AUTH_NONE
|| num_passwds >= MAX_AUTH_KEYS)
break;
memcpy(&ifp->int_auth[num_passwds++],
&parmp->parm_auth[i],
sizeof(ifp->int_auth[0]));
}
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_adj_inmetric != 0)
ifp->int_adj_inmetric = parmp->parm_adj_inmetric;
if (parmp->parm_adj_outmetric != 0)
ifp->int_adj_outmetric = parmp->parm_adj_outmetric;
}
}
/* Set general defaults.
*
* Default poor-man's router discovery to a metric that will
* be heard by old versions of `routed`. They ignored received
* routes with metric 15.
*/
if ((ifp->int_state & IS_PM_RDISC)
&& ifp->int_d_metric == 0)
ifp->int_d_metric = FAKE_METRIC;
if (ifp->int_rdisc_int == 0)
ifp->int_rdisc_int = DefMaxAdvertiseInterval;
if (!(ifp->int_if_flags & IFF_MULTICAST)
&& !(ifp->int_state & IS_REMOTE))
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_OUT))
ifp->int_state |= IS_NO_SOL_OUT;
if (0 == (ifp->int_state & GROUP_IS_ADV_OUT))
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;
if (!IS_RIP_IN_OFF(ifp->int_state)
&& ifp->int_auth[0].type != RIP_AUTH_NONE
&& !(ifp->int_state & IS_NO_RIPV1_IN)
&& !warned_auth_in) {
msglog("Warning: RIPv1 input via %s"
" will be accepted without authentication",
ifp->int_name);
warned_auth_in = 1;
}
if (!IS_RIP_OUT_OFF(ifp->int_state)
&& ifp->int_auth[0].type != RIP_AUTH_NONE
&& !(ifp->int_state & IS_NO_RIPV1_OUT)) {
if (!warned_auth_out) {
msglog("Warning: RIPv1 output via %s"
" will be sent without authentication",
ifp->int_name);
warned_auth_out = 1;
}
}
}
/* 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;
const char *cp;
char lbuf[200], net_host[5], dname[64+1+64+1];
char gname[GNAME_LEN+1], qual[9];
struct interface *ifp;
naddr dst, netmask, gate;
int metric, n, lnum;
struct stat sb;
u_int state;
const char *type;
fp = fopen(_PATH_GATEWAYS, "r");
if (fp == NULL)
return;
if (0 > fstat(fileno(fp), &sb)) {
msglog("could not stat() "_PATH_GATEWAYS);
(void)fclose(fp);
return;
}
for (lnum = 1; ; lnum++) {
if (fgets(lbuf, sizeof(lbuf), fp) == NULL)
break;
lptr = lbuf;
while (*lptr == ' ')
lptr++;
p = lptr+strlen(lptr)-1;
while (*p == '\n'
|| (*p == ' ' && (p == lptr+1 || *(p-1) != '\\')))
*p-- = '\0';
if (*lptr == '\0' /* ignore null and comment lines */
|| *lptr == '#')
continue;
/* notice newfangled parameter lines
*/
if (strncasecmp("net", lptr, 3)
&& strncasecmp("host", lptr, 4)) {
cp = parse_parms(lptr,
(sb.st_uid == 0
&& !(sb.st_mode&(S_IRWXG|S_IRWXO))));
if (cp != NULL)
msglog("%s in line %d of "_PATH_GATEWAYS,
cp, lnum);
continue;
}
/* {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */
qual[0] = '\0';
/* the '64' here must be GNAME_LEN */
n = sscanf(lptr, "%4s %129[^ \t] gateway"
" %64[^ / \t] metric %u %8s\n",
net_host, dname, gname, &metric, qual);
if (n != 4 && n != 5) {
msglog("bad "_PATH_GATEWAYS" entry \"%s\"; %d values",
lptr, n);
continue;
}
if (metric >= HOPCNT_INFINITY) {
msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"",
lptr);
continue;
}
if (!strcasecmp(net_host, "host")) {
if (!gethost(dname, &dst)) {
msglog("bad host \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", dname, lptr);
continue;
}
netmask = HOST_MASK;
} else if (!strcasecmp(net_host, "net")) {
if (!getnet(dname, &dst, &netmask)) {
msglog("bad net \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", dname, lptr);
continue;
}
if (dst == RIP_DEFAULT) {
msglog("bad net \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"--cannot be default",
dname, lptr);
continue;
}
/* Turn network # into IP address. */
dst = htonl(dst);
} else {
msglog("bad \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", net_host, lptr);
continue;
}
if (!gethost(gname, &gate)) {
msglog("bad gateway \"%s\" in "_PATH_GATEWAYS
" entry \"%s\"", gname, lptr);
continue;
}
if (!strcasecmp(qual, type = "passive")) {
/* 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 (!strcasecmp(qual, type = "external")) {
/* 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.
*/
strcpy(qual,"external");
state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL;
if (metric == 0)
metric = 1;
} else if (!strcasecmp(qual, "active")
|| 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 | IS_ALIAS;
type = "alias";
}
} else {
msglog("bad "_PATH_GATEWAYS" entry \"%s\";"
" unknown type %s", lptr, qual);
continue;
}
if (0 != (state & (IS_PASSIVE | IS_REMOTE)))
state |= IS_NO_RDISC;
if (state & IS_PASSIVE)
state |= IS_NO_RIP;
ifp = check_dup(gate,dst,netmask,state);
if (ifp != NULL) {
msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr);
continue;
}
ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()");
memset(ifp, 0, sizeof(*ifp));
ifp->int_state = state;
if (netmask == HOST_MASK)
ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP;
else
ifp->int_if_flags = IFF_UP;
ifp->int_act_time = NEVER;
ifp->int_addr = gate;
ifp->int_dstaddr = dst;
ifp->int_mask = netmask;
ifp->int_ripv1_mask = netmask;
ifp->int_std_mask = std_mask(gate);
ifp->int_net = ntohl(dst);
ifp->int_std_net = ifp->int_net & ifp->int_std_mask;
ifp->int_std_addr = htonl(ifp->int_std_net);
ifp->int_metric = metric;
if (!(state & IS_EXTERNAL)
&& ifp->int_mask != ifp->int_std_mask)
ifp->int_state |= IS_SUBNET;
(void)sprintf(ifp->int_name, "%s(%s)", type, gname);
ifp->int_index = -1;
if_link(ifp);
}
/* After all of the parameter lines have been read,
* apply them to any remote interfaces.
*/
LIST_FOREACH(ifp, &ifnet, int_list) {
get_parms(ifp);
tot_interfaces++;
if (!IS_RIP_OFF(ifp->int_state))
rip_interfaces++;
trace_if("Add", ifp);
}
(void)fclose(fp);
}
/* like strtok(), but honoring backslash and not changing the source string
*/
static int /* 0=ok, -1=bad */
parse_quote(char **linep, /* look here */
const char *delims, /* for these delimiters */
char *delimp, /* 0 or put found delimiter here */
char *buf, /* copy token to here */
int lim) /* at most this many bytes */
{
char c = '\0', *pc;
const char *p;
pc = *linep;
if (*pc == '\0')
return -1;
while (lim != 0) {
c = *pc++;
if (c == '\0')
break;
if (c == '\\' && *pc != '\0') {
if ((c = *pc++) == 'n') {
c = '\n';
} else if (c == 'r') {
c = '\r';
} else if (c == 't') {
c = '\t';
} else if (c == 'b') {
c = '\b';
} else if (c >= '0' && c <= '7') {
c -= '0';
if (*pc >= '0' && *pc <= '7') {
c = (c<<3)+(*pc++ - '0');
if (*pc >= '0' && *pc <= '7')
c = (c<<3)+(*pc++ - '0');
}
}
} else {
for (p = delims; *p != '\0'; ++p) {
if (*p == c)
goto exit;
}
}
*buf++ = c;
--lim;
}
exit:
if (lim == 0)
return -1;
*buf = '\0'; /* terminate copy of token */
if (delimp != NULL)
*delimp = c; /* return delimiter */
*linep = pc-1; /* say where we ended */
return 0;
}
/* Parse password timestamp
*/
static char *
parse_ts(time_t *tp,
char **valp,
char *val0,
char *delimp,
char *buf,
u_int bufsize)
{
struct tm tm;
char *ptr;
if (0 > parse_quote(valp, "| ,\n\r", delimp,
buf,bufsize)
|| buf[bufsize-1] != '\0'
|| buf[bufsize-2] != '\0') {
sprintf(buf,"bad timestamp %.25s", val0);
return buf;
}
strcat(buf,"\n");
memset(&tm, 0, sizeof(tm));
ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm);
if (ptr == NULL || *ptr != '\0') {
sprintf(buf,"bad timestamp %.25s", val0);
return buf;
}
if ((*tp = mktime(&tm)) == -1) {
sprintf(buf,"bad timestamp %.25s", val0);
return buf;
}
return 0;
}
/* Get a password, key ID, and expiration date in the format
* passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min
*/
static const char * /* 0 or error message */
get_passwd(char *tgt,
char *val,
struct parm *parmp,
u_int16_t type,
int safe) /* 1=from secure file */
{
static char buf[80];
char *val0, *p, delim;
struct auth k, *ap, *ap2;
int i;
u_long l;
assert(val != NULL);
if (!safe)
return "ignore unsafe password";
for (ap = parmp->parm_auth, i = 0;
ap->type != RIP_AUTH_NONE; i++, ap++) {
if (i >= MAX_AUTH_KEYS)
return "too many passwords";
}
memset(&k, 0, sizeof(k));
k.type = type;
k.end = -1-DAY;
val0 = val;
if (0 > parse_quote(&val, "| ,\n\r", &delim,
(char *)k.key, sizeof(k.key)))
return tgt;
if (delim != '|') {
if (type == RIP_AUTH_MD5)
return "missing Keyid";
} else {
val0 = ++val;
buf[sizeof(buf)-1] = '\0';
if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf))
|| buf[sizeof(buf)-1] != '\0'
|| (l = strtoul(buf,&p,0)) > 255
|| *p != '\0') {
sprintf(buf,"bad KeyID \"%.20s\"", val0);
return buf;
}
for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) {
if (ap2->keyid == l) {
sprintf(buf,"duplicate KeyID \"%.20s\"", val0);
return buf;
}
}
k.keyid = (int)l;
if (delim == '|') {
val0 = ++val;
if (NULL != (p = parse_ts(&k.start,&val,val0,&delim,
buf,sizeof(buf))))
return p;
if (delim != '|')
return "missing second timestamp";
val0 = ++val;
if (NULL != (p = parse_ts(&k.end,&val,val0,&delim,
buf,sizeof(buf))))
return p;
if ((u_long)k.start > (u_long)k.end) {
sprintf(buf,"out of order timestamp %.30s",
val0);
return buf;
}
}
}
if (delim != '\0')
return tgt;
memmove(ap, &k, sizeof(*ap));
return 0;
}
static const char *
bad_str(const char *estr)
{
static char buf[100+8];
sprintf(buf, "bad \"%.100s\"", estr);
return buf;
}
/* Parse a set of parameters for an interface.
*/
const char * /* 0 or error message */
parse_parms(char *line,
int safe) /* 1=from secure file */
{
#define PARS(str) (!strcasecmp(tgt, str))
#define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str)))
#define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \
parm.parm_int_state |= (b);}
struct parm parm;
struct intnet *intnetp;
struct r1net *r1netp;
struct tgate *tg;
naddr addr, mask;
char delim, *val0 = NULL, *tgt, *val, *p;
const char *msg;
char buf[BUFSIZ], buf2[BUFSIZ];
int i;
/* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */
if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1)
&& *(val = &line[sizeof("subnet=")-1]) != '\0') {
if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)))
return bad_str(line);
intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp),
"parse_parms subnet");
intnetp->intnet_metric = 1;
if (delim == ',') {
intnetp->intnet_metric = (int)strtol(val+1,&p,0);
if (*p != '\0'
|| intnetp->intnet_metric <= 0
|| intnetp->intnet_metric >= HOPCNT_INFINITY) {
free(intnetp);
return bad_str(line);
}
}
if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask)
|| intnetp->intnet_mask == HOST_MASK
|| intnetp->intnet_addr == RIP_DEFAULT) {
free(intnetp);
return bad_str(line);
}
intnetp->intnet_addr = htonl(intnetp->intnet_addr);
intnetp->intnet_next = intnets;
intnets = intnetp;
return 0;
}
/* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line.
* This requires that x.y.z.u/mask1 be considered a subnet of
* x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network.
*/
if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1)
&& *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') {
if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))
|| delim == '\0')
return bad_str(line);
if ((i = (int)strtol(val+1, &p, 0)) <= 0
|| i > 32 || *p != '\0')
return bad_str(line);
r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp),
"parse_parms ripv1_mask");
r1netp->r1net_mask = HOST_MASK << (32-i);
if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match)
|| r1netp->r1net_net == RIP_DEFAULT
|| r1netp->r1net_mask > r1netp->r1net_match) {
free(r1netp);
return bad_str(line);
}
r1netp->r1net_next = r1nets;
r1nets = r1netp;
return 0;
}
memset(&parm, 0, sizeof(parm));
for (;;) {
tgt = line + strspn(line, " ,\n\r");
if (*tgt == '\0' || *tgt == '#')
break;
line = tgt+strcspn(tgt, "= #,\n\r");
delim = *line;
if (delim == '=') {
val0 = ++line;
if (0 > parse_quote(&line, " #,\n\r",&delim,
buf,sizeof(buf)))
return bad_str(tgt);
} else {
val0 = NULL;
}
if (delim != '\0') {
for (;;) {
*line = '\0';
if (delim == '#')
break;
++line;
if (delim != ' '
|| (delim = *line) != ' ')
break;
}
}
if (PARSEQ("if")) {
if (parm.parm_name[0] != '\0'
|| strlen(buf) > IF_NAME_LEN)
return bad_str(tgt);
strcpy(parm.parm_name, buf);
} else if (PARSEQ("addr")) {
/* This is a bad idea, because the address based
* sets of parameters cannot be checked for
* consistency with the interface name parameters.
* The parm_net stuff is needed to allow several
* -F settings.
*/
if (val0 == NULL || !getnet(val0, &addr, &mask)
|| parm.parm_name[0] != '\0')
return bad_str(tgt);
parm.parm_net = addr;
parm.parm_mask = mask;
parm.parm_name[0] = '\n';
} else if (PARSEQ("passwd")) {
/* since cleartext passwords are so weak allow
* them anywhere
*/
if (val0 == NULL)
return bad_str("no passwd");
msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1);
if (msg) {
*val0 = '\0';
return bad_str(msg);
}
} else if (PARSEQ("md5_passwd")) {
msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe);
if (msg) {
*val0 = '\0';
return bad_str(msg);
}
} 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_rip_out")) {
parm.parm_int_state |= IS_NO_RIP_OUT;
} 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)
return bad_str(tgt);
parm.parm_int_state |= IS_NO_RIPV1_OUT;
} else if (PARS("ripv2")) {
if ((parm.parm_int_state & IS_NO_RIPV2_OUT)
|| (parm.parm_int_state & IS_NO_RIPV2_IN))
return bad_str(tgt);
parm.parm_int_state |= (IS_NO_RIPV1_IN
| IS_NO_RIPV1_OUT);
} else if (PARS("no_rip")) {
CKF(IS_PM_RDISC, IS_NO_RIP);
} else if (PARS("no_rip_mcast")) {
parm.parm_int_state |= IS_NO_RIP_MCAST;
} else if (PARS("no_rdisc")) {
CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
} else if (PARS("no_solicit")) {
CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT);
} else if (PARS("send_solicit")) {
CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT);
} else if (PARS("no_rdisc_adv")) {
CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT);
} else if (PARS("rdisc_adv")) {
CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT);
} else if (PARS("bcast_rdisc")) {
parm.parm_int_state |= IS_BCAST_RDISC;
} else if (PARS("passive")) {
CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE;
} else if (PARSEQ("rdisc_pref")) {
if (parm.parm_rdisc_pref != 0
|| (parm.parm_rdisc_pref = (int)strtol(buf,&p,0),
*p != '\0'))
return bad_str(tgt);
} else if (PARS("pm_rdisc")) {
if (IS_RIP_OUT_OFF(parm.parm_int_state))
return bad_str(tgt);
parm.parm_int_state |= IS_PM_RDISC;
} else if (PARSEQ("rdisc_interval")) {
if (parm.parm_rdisc_int != 0
|| (parm.parm_rdisc_int = (int)strtoul(buf,&p,0),
*p != '\0')
|| parm.parm_rdisc_int < MinMaxAdvertiseInterval
|| parm.parm_rdisc_int > MaxMaxAdvertiseInterval)
return bad_str(tgt);
} else if (PARSEQ("fake_default")) {
if (parm.parm_d_metric != 0
|| IS_RIP_OUT_OFF(parm.parm_int_state)
|| (i = strtoul(buf,&p,0), *p != '\0')
|| i > HOPCNT_INFINITY-1)
return bad_str(tgt);
parm.parm_d_metric = i;
} else if (PARSEQ("adj_inmetric")) {
if (parm.parm_adj_inmetric != 0
|| (i = strtoul(buf,&p,0), *p != '\0')
|| i > HOPCNT_INFINITY-1)
return bad_str(tgt);
parm.parm_adj_inmetric = i;
} else if (PARSEQ("adj_outmetric")) {
if (parm.parm_adj_outmetric != 0
|| (i = strtoul(buf,&p,0), *p != '\0')
|| i > HOPCNT_INFINITY-1)
return bad_str(tgt);
parm.parm_adj_outmetric = i;
} else if (PARSEQ("trust_gateway")) {
/* look for trust_gateway=x.y.z|net/mask|...) */
p = buf;
if (0 > parse_quote(&p, "|", &delim,
buf2, sizeof(buf2))
|| !gethost(buf2,&addr))
return bad_str(tgt);
tg = (struct tgate *)rtmalloc(sizeof(*tg),
"parse_parms"
"trust_gateway");
memset(tg, 0, sizeof(*tg));
tg->tgate_addr = addr;
i = 0;
/* The default is to trust all routes. */
while (delim == '|') {
p++;
if (i >= MAX_TGATE_NETS
|| 0 > parse_quote(&p, "|", &delim,
buf2, sizeof(buf2))
|| !getnet(buf2, &tg->tgate_nets[i].net,
&tg->tgate_nets[i].mask)
|| tg->tgate_nets[i].net == RIP_DEFAULT
|| tg->tgate_nets[i].mask == 0) {
free(tg);
return bad_str(tgt);
}
i++;
}
tg->tgate_next = tgates;
tgates = tg;
parm.parm_int_state |= IS_DISTRUST;
} else if (PARS("redirect_ok")) {
parm.parm_int_state |= IS_REDIRECT_OK;
} else {
return bad_str(tgt); /* error */
}
}
return check_parms(&parm);
#undef PARS
#undef PARSEQ
}
/* check for duplicate parameter specifications */
const char * /* 0 or error message */
check_parms(struct parm *new)
{
struct parm *parmp, **parmpp;
int i, num_passwds;
/* set implicit values
*/
if (new->parm_int_state & IS_NO_ADV_IN)
new->parm_int_state |= IS_NO_SOL_OUT;
if (new->parm_int_state & IS_NO_SOL_OUT)
new->parm_int_state |= IS_NO_ADV_IN;
for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) {
if (new->parm_auth[i].type != RIP_AUTH_NONE)
num_passwds++;
}
/* compare with existing sets of parameters
*/
for (parmpp = &parms;
(parmp = *parmpp) != NULL;
parmpp = &parmp->parm_next) {
if (strcmp(new->parm_name, parmp->parm_name))
continue;
if (!on_net(htonl(parmp->parm_net),
new->parm_net, new->parm_mask)
&& !on_net(htonl(new->parm_net),
parmp->parm_net, parmp->parm_mask))
continue;
for (i = 0; i < MAX_AUTH_KEYS; i++) {
if (parmp->parm_auth[i].type != RIP_AUTH_NONE)
num_passwds++;
}
if (num_passwds > MAX_AUTH_KEYS)
return "too many conflicting passwords";
if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT)
&& 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT)
&& 0 != ((new->parm_int_state ^ parmp->parm_int_state)
& GROUP_IS_SOL_OUT))
|| (0 != (new->parm_int_state & GROUP_IS_ADV_OUT)
&& 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT)
&& 0 != ((new->parm_int_state ^ parmp->parm_int_state)
& GROUP_IS_ADV_OUT))
|| (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)) {
return ("conflicting, duplicate router discovery"
" parameters");
}
if (new->parm_d_metric != 0
&& parmp->parm_d_metric != 0
&& new->parm_d_metric != parmp->parm_d_metric) {
return ("conflicting, duplicate poor man's router"
" discovery or fake default metric");
}
if (new->parm_adj_inmetric != 0
&& parmp->parm_adj_inmetric != 0
&& new->parm_adj_inmetric != parmp->parm_adj_inmetric) {
return ("conflicting interface input "
"metric adjustments");
}
if (new->parm_adj_outmetric != 0
&& parmp->parm_adj_outmetric != 0
&& new->parm_adj_outmetric != parmp->parm_adj_outmetric) {
return ("conflicting interface output "
"metric adjustments");
}
}
/* link new entry on the list so that when the entries are scanned,
* they affect the result in the order the operator specified.
*/
parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms");
memcpy(parmp, new, sizeof(*parmp));
*parmpp = 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 *netp, /* network in host byte order */
naddr *maskp) /* masks are always in host order */
{
int i;
struct netent *np;
naddr mask; /* in host byte order */
struct in_addr in; /* a network and so host byte order */
char hname[MAXHOSTNAMELEN+1];
char *mname, *p;
/* Detect and separate "1.2.3.4/24"
*/
if (NULL != (mname = strrchr(name,'/'))) {
i = (int)(mname - name);
if (i > (int)sizeof(hname)-1) /* name too long */
return 0;
memmove(hname, name, i);
hname[i] = '\0';
mname++;
name = hname;
}
np = getnetbyname(name);
if (np != NULL) {
in.s_addr = (naddr)np->n_net;
if (0 == (in.s_addr & 0xff000000))
in.s_addr <<= 8;
if (0 == (in.s_addr & 0xff000000))
in.s_addr <<= 8;
if (0 == (in.s_addr & 0xff000000))
in.s_addr <<= 8;
} else if (inet_aton(name, &in) == 1) {
in.s_addr = ntohl(in.s_addr);
} else if (!mname && !strcasecmp(name,"default")) {
in.s_addr = RIP_DEFAULT;
} else {
return 0;
}
if (!mname) {
/* we cannot use the interfaces here because we have not
* looked at them yet.
*/
mask = std_mask(htonl(in.s_addr));
if ((~mask & in.s_addr) != 0)
mask = HOST_MASK;
} else {
mask = (naddr)strtoul(mname, &p, 0);
if (*p != '\0' || mask > 32)
return 0;
if (mask != 0)
mask = HOST_MASK << (32-mask);
}
/* must have mask of 0 with default */
if (mask != 0 && in.s_addr == RIP_DEFAULT)
return 0;
/* no host bits allowed in a network number */
if ((~mask & in.s_addr) != 0)
return 0;
/* require non-zero network number */
if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT)
return 0;
if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT)
return 0;
if (in.s_addr>>24 == 0xff)
return 0;
*netp = 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) {
/* get a good number, but check that it it makes some
* sense.
*/
if (ntohl(in.s_addr)>>24 == 0
|| ntohl(in.s_addr)>>24 == 0xff)
return 0;
*addrp = in.s_addr;
return 1;
}
hp = gethostbyname(name);
if (hp) {
memcpy(addrp, hp->h_addr, sizeof(*addrp));
return 1;
}
return 0;
}
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