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/* $OpenBSD: irr_prefix.c,v 1.10 2007/03/05 16:40:10 henning Exp $ */
/*
* Copyright (c) 2007 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 OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "irrfilter.h"
void prefixset_aggregate(struct prefix_set *);
int prefix_aggregate(struct irr_prefix *, const struct irr_prefix *);
int irr_prefix_cmp(const void *, const void *);
int prefix_set_compare(struct prefix_set *, struct prefix_set *);
struct prefix_set
*prefix_set_find(char *);
RB_HEAD(prefix_set_h, prefix_set) prefix_set_h;
RB_PROTOTYPE(prefix_set_h, prefix_set, entry, prefix_set_compare)
RB_GENERATE(prefix_set_h, prefix_set, entry, prefix_set_compare)
struct prefix_set *curpfxs = NULL;
struct prefix_set *
prefixset_get(char *as)
{
struct prefix_set *pfxs;
if ((pfxs = prefix_set_find(as)) != NULL)
return (pfxs);
/* nothing found, resolve and store */
if ((pfxs = calloc(1, sizeof(*pfxs))) == NULL)
err(1, "get_prefixset calloc");
if ((pfxs->as = strdup(as)) == NULL)
err(1, "get_prefixset strdup");
RB_INSERT(prefix_set_h, &prefix_set_h, pfxs);
curpfxs = pfxs;
if (whois(as, QTYPE_ROUTE) == -1)
errx(1, "whois error, prefixset_get %s", as);
curpfxs = NULL;
prefixset_aggregate(pfxs);
return (pfxs);
}
int
prefixset_addmember(char *s)
{
void *p;
u_int i;
struct irr_prefix *pfx;
int len;
if (strchr(s, '/') == NULL)
errx(1, "prefix %s does not have the len specified", s);
if ((pfx = calloc(1, sizeof(*pfx))) == NULL)
err(1, "prefixset_addmember calloc");
if ((len = inet_net_pton(AF_INET, s, &pfx->addr.in,
sizeof(pfx->addr.in))) == -1)
err(1, "prefixset_addmember inet_net_pton \"%s\"", s);
pfx->af = AF_INET;
pfx->len = len;
/* yes, there are dupes... e. g. from multiple sources */
for (i = 0; i < curpfxs->prefixcnt; i++)
if (irr_prefix_cmp(&curpfxs->prefix[i], &pfx) == 0) {
free(pfx);
return (0);
}
if ((p = realloc(curpfxs->prefix,
(curpfxs->prefixcnt + 1) * sizeof(void *))) == NULL)
err(1, "prefixset_addmember realloc");
curpfxs->prefix = p;
curpfxs->prefixcnt++;
curpfxs->prefix[curpfxs->prefixcnt - 1] = pfx;
return (1);
}
void
prefixset_aggregate(struct prefix_set *pfxs)
{
u_int i, cnt, newcnt;
int res;
struct irr_prefix *cur, *last;
void *p;
qsort(pfxs->prefix, pfxs->prefixcnt, sizeof(void *), irr_prefix_cmp);
cnt = pfxs->prefixcnt;
do {
last = cur = NULL;
for (i = 0, newcnt = 0; i < cnt; i++) {
cur = pfxs->prefix[i];
if (last != NULL && last->af == cur->af) {
if (cur->af == AF_INET)
res = prefix_aggregate(last, cur);
else
res = 0;
if (res == 1) { /* cur is covered by last */
if (cur->len > last->maxlen)
last->maxlen = cur->len;
free(pfxs->prefix[i]);
pfxs->prefix[i] = cur = NULL;
}
}
if (cur != NULL) {
pfxs->prefix[newcnt++] = cur;
last = cur;
}
}
cnt = newcnt;
} while (newcnt < i);
if (newcnt == pfxs->prefixcnt)
return;
if (0)
printf("%s: prefix aggregation: %u -> %u\n",
pfxs->as, pfxs->prefixcnt, newcnt);
if ((p = realloc(pfxs->prefix, newcnt * sizeof(void *))) == NULL)
err(1, "prefixset_aggregate realloc");
pfxs->prefix = p;
pfxs->prefixcnt = newcnt;
}
int
prefix_aggregate(struct irr_prefix *a, const struct irr_prefix *b)
{
in_addr_t mask;
if (a->len == 0)
return (1);
mask = htonl(0xffffffff << (32 - a->len));
if ((a->addr.in.s_addr & mask) == (b->addr.in.s_addr & mask))
return (1);
/* see wether we can fold them in one */
if (a->len == b->len && a->len > 1) {
mask = htonl(0xffffffff << (32 - (a->len - 1)));
if ((a->addr.in.s_addr & mask) ==
(b->addr.in.s_addr & mask)) {
a->len--;
a->addr.in.s_addr &= mask;
return (1);
}
}
return (0);
}
int
irr_prefix_cmp(const void *a, const void *b)
{
const struct irr_prefix *pa;
const struct irr_prefix *pb;
int r;
pa = *((const struct irr_prefix * const *)a);
pb = *((const struct irr_prefix * const *)b);
if ((r = pa->af - pb->af) != 0)
return (r);
if (pa->af == AF_INET) {
if (ntohl(pa->addr.in.s_addr) <
ntohl(pb->addr.in.s_addr))
return (-1);
if (ntohl(pa->addr.in.s_addr) >
ntohl(pb->addr.in.s_addr))
return (1);
} else
errx(1, "irr_prefix_cmp unknown af %u", pa->af);
if ((r = pa->len - pb->len) != 0)
return (r);
return (0);
}
/* RB helpers */
int
prefix_set_compare(struct prefix_set *a, struct prefix_set *b)
{
return (strcmp(a->as, b->as));
}
struct prefix_set *
prefix_set_find(char *as)
{
struct prefix_set s;
s.as = as;
return (RB_FIND(prefix_set_h, &prefix_set_h, &s));
}
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