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/* $OpenBSD: irr_output.c,v 1.21 2018/09/17 13:35:36 claudio 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/stat.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "bgpd.h"
#include "irrfilter.h"
int process_policies(FILE *, struct policy_head *);
void policy_prettyprint(FILE *, struct policy_item *);
void policy_torule(FILE *, struct policy_item *);
char *action_torule(char *);
void print_rule(FILE *, struct policy_item *, char *, struct irr_prefix *);
#define allowed_in_address(x) \
(isalnum((unsigned char)x) || x == '.' || x == ':' || x == '-')
int
write_filters(char *outpath)
{
struct router *r;
char *fn;
int fd, ret = 0;
u_int i;
FILE *fh;
while ((r = TAILQ_FIRST(&router_head)) != NULL) {
TAILQ_REMOVE(&router_head, r, entry);
if (r->address != NULL && r->address[0] != '\0') {
for (i = 0; i < strlen(r->address); i++)
if (!allowed_in_address(r->address[i]))
errx(1, "router address \"%s\" contains"
" illegal character \"%c\"",
r->address, r->address[i]);
if (asprintf(&fn, "%s/bgpd-%s.filter",
outpath, r->address) == -1)
err(1, "write_filters asprintf");
} else
if (asprintf(&fn, "%s/bgpd.filter",
outpath) == -1)
err(1, "write_filters asprintf");
fd = open(fn, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
if (fd == -1)
err(1, "error opening %s", fn);
if ((fh = fdopen(fd, "w")) == NULL)
err(1, "fdopen %s", fn);
if (process_policies(fh, &r->policy_h) == -1)
ret = -1;
fclose(fh);
close(fd);
free(fn);
free(r->address);
free(r);
}
return (ret);
}
int
process_policies(FILE *fh, struct policy_head *head)
{
struct policy_item *pi;
while ((pi = TAILQ_FIRST(head)) != NULL) {
TAILQ_REMOVE(head, pi, entry);
policy_prettyprint(fh, pi);
policy_torule(fh, pi);
fflush(fh);
free(pi->peer_addr);
free(pi->action);
free(pi->filter);
free(pi);
}
return (0);
}
void
policy_prettyprint(FILE *fh, struct policy_item *pi)
{
if (pi->dir == IMPORT)
fprintf(fh, "# import: from ");
else
fprintf(fh, "# export: to ");
fprintf(fh, "AS%u ", pi->peer_as);
if (pi->peer_addr)
fprintf(fh, "%s ", pi->peer_addr);
if (pi->action)
fprintf(fh, "action %s ", pi->action);
fprintf(fh, "%s %s\n", pi->dir == IMPORT ? "accept" : "announce",
pi->filter);
}
void
policy_torule(FILE *fh, struct policy_item *pi)
{
struct irr_as_set *ass;
struct prefix_set *pfxs;
char *srcas;
u_int i, j;
if (pi->filter == NULL || !strcasecmp(pi->filter, "any"))
print_rule(fh, pi, NULL, NULL);
else {
ass = asset_expand(pi->filter);
for (i = 0; i < ass->n_as; i++) {
pfxs = prefixset_get(ass->as[i]);
/* ass->as[i] format and len have been checked before */
if (strlen(ass->as[i]) < 3)
errx(1, "%s not AS...", ass->as[i]);
srcas = ass->as[i] + 2;
for (j = 0; j < pfxs->prefixcnt; j++)
print_rule(fh, pi, srcas, pfxs->prefix[j]);
}
}
}
/* XXX should really be parsed earlier! */
char *
action_torule(char *s)
{
int cnt = 0;
char *key, *val, *pre, *tmp;
static char abuf[8192];
char ebuf[2048];
if ((tmp = strdup(s)) == NULL)
err(1, NULL);
abuf[0] = '\0';
while ((val = strsep(&tmp, ";")) != NULL && *val) {
key = strsep(&val, "=");
if (key == NULL || val == NULL)
err(1, "format error in action spec\n");
EATWS(key);
EATWS(val);
if (cnt++ == 0)
pre = " set {";
else
pre = ",";
if (!strcmp(key, "pref"))
snprintf(ebuf, sizeof(ebuf),
"%s localpref %s", pre, val);
else if (!strcmp(key, "med"))
snprintf(ebuf, sizeof(ebuf),
"%s med %s", pre, val);
else
warnx("unknown action key \"%s\"", key);
strlcat(abuf, ebuf, sizeof(abuf));
}
if (cnt > 0)
strlcat(abuf, " }", sizeof(abuf));
free(tmp);
return (abuf);
}
void
print_rule(FILE *fh, struct policy_item *pi, char *sourceas,
struct irr_prefix *prefix)
{
char peer[PEER_DESCR_LEN];
char *action = "";
char *dir;
char *srcas[2] = { "", "" };
char pbuf[8 + NI_MAXHOST + 4 + 14 + 3];
size_t offset;
if (pi->dir == IMPORT)
dir = "from";
else
dir = "to";
if (pi->peer_addr)
snprintf(peer, PEER_DESCR_LEN, "%s", pi->peer_addr);
else
snprintf(peer, PEER_DESCR_LEN, "AS %s", log_as(pi->peer_as));
if (pi->action)
action = action_torule(pi->action);
pbuf[0] = '\0';
if (prefix != NULL) {
strlcpy(pbuf, " prefix ", sizeof(pbuf));
offset = strlen(pbuf);
if (inet_ntop(prefix->af, &prefix->addr, pbuf + offset,
sizeof(pbuf) - offset) == NULL)
err(1, "print_rule inet_ntop");
offset = strlen(pbuf);
if (snprintf(pbuf + offset, sizeof(pbuf) - offset,
"/%u", prefix->len) == -1)
err(1, "print_rule snprintf");
if (prefix->maxlen > prefix->len) {
offset = strlen(pbuf);
if (snprintf(pbuf + offset, sizeof(pbuf) - offset,
" prefixlen <= %u", prefix->maxlen) == -1)
err(1, "print_rule snprintf");
}
if (pi->dir == IMPORT) {
srcas[0] = " source-as ";
srcas[1] = sourceas;
}
}
fprintf(fh, "allow quick %s %s%s%s%s%s\n", dir, peer,
srcas[0], srcas[1], pbuf, action);
}
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