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/* $OpenBSD: util.c,v 1.5 2008/11/06 21:16:27 claudio Exp $ */
/*
* Copyright (c) 2006 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2003, 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 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/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "bgpd.h"
#include "rde.h"
const char *
log_addr(const struct bgpd_addr *addr)
{
static char buf[48];
if (inet_ntop(addr->af, &addr->ba, buf, sizeof(buf)) == NULL)
return ("?");
else
return (buf);
}
const char *
log_in6addr(const struct in6_addr *addr)
{
struct sockaddr_in6 sa_in6;
u_int16_t tmp16;
bzero(&sa_in6, sizeof(sa_in6));
sa_in6.sin6_len = sizeof(sa_in6);
sa_in6.sin6_family = AF_INET6;
memcpy(&sa_in6.sin6_addr, addr, sizeof(sa_in6.sin6_addr));
/* XXX thanks, KAME, for this ugliness... adopted from route/show.c */
if (IN6_IS_ADDR_LINKLOCAL(&sa_in6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sa_in6.sin6_addr)) {
memcpy(&tmp16, &sa_in6.sin6_addr.s6_addr[2], sizeof(tmp16));
sa_in6.sin6_scope_id = ntohs(tmp16);
sa_in6.sin6_addr.s6_addr[2] = 0;
sa_in6.sin6_addr.s6_addr[3] = 0;
}
return (log_sockaddr((struct sockaddr *)&sa_in6));
}
const char *
log_sockaddr(struct sockaddr *sa)
{
static char buf[NI_MAXHOST];
if (getnameinfo(sa, sa->sa_len, buf, sizeof(buf), NULL, 0,
NI_NUMERICHOST))
return ("(unknown)");
else
return (buf);
}
const char *
log_as(u_int32_t as)
{
static char buf[12]; /* "65000.65000\0" */
if (as <= USHRT_MAX) {
if (snprintf(buf, sizeof(buf), "%u", as) == -1)
return ("?");
} else {
if (snprintf(buf, sizeof(buf), "%u.%u", as >> 16,
as & 0xffff) == -1)
return ("?");
}
return (buf);
}
int
aspath_snprint(char *buf, size_t size, void *data, u_int16_t len)
{
#define UPDATE() \
do { \
if (r == -1) \
return (-1); \
total_size += r; \
if ((unsigned int)r < size) { \
size -= r; \
buf += r; \
} else { \
buf += size; \
size = 0; \
} \
} while (0)
u_int8_t *seg;
int r, total_size;
u_int16_t seg_size;
u_int8_t i, seg_type, seg_len;
total_size = 0;
seg = data;
for (; len > 0; len -= seg_size, seg += seg_size) {
seg_type = seg[0];
seg_len = seg[1];
seg_size = 2 + sizeof(u_int32_t) * seg_len;
if (seg_type == AS_SET) {
if (total_size != 0)
r = snprintf(buf, size, " { ");
else
r = snprintf(buf, size, "{ ");
UPDATE();
} else if (total_size != 0) {
r = snprintf(buf, size, " ");
UPDATE();
}
for (i = 0; i < seg_len; i++) {
r = snprintf(buf, size, "%s",
log_as(aspath_extract(seg, i)));
UPDATE();
if (i + 1 < seg_len) {
r = snprintf(buf, size, " ");
UPDATE();
}
}
if (seg_type == AS_SET) {
r = snprintf(buf, size, " }");
UPDATE();
}
}
/* ensure that we have a valid C-string especially for empty as path */
if (size > 0)
*buf = '\0';
return (total_size);
#undef UPDATE
}
int
aspath_asprint(char **ret, void *data, u_int16_t len)
{
size_t slen;
int plen;
slen = aspath_strlen(data, len) + 1;
*ret = malloc(slen);
if (*ret == NULL)
return (-1);
plen = aspath_snprint(*ret, slen, data, len);
if (plen == -1) {
free(*ret);
*ret = NULL;
return (-1);
}
return (0);
}
size_t
aspath_strlen(void *data, u_int16_t len)
{
u_int8_t *seg;
int total_size;
u_int32_t as;
u_int16_t seg_size;
u_int8_t i, seg_type, seg_len;
total_size = 0;
seg = data;
for (; len > 0; len -= seg_size, seg += seg_size) {
seg_type = seg[0];
seg_len = seg[1];
seg_size = 2 + sizeof(u_int32_t) * seg_len;
if (seg_type == AS_SET)
if (total_size != 0)
total_size += 3;
else
total_size += 2;
else if (total_size != 0)
total_size += 1;
for (i = 0; i < seg_len; i++) {
as = aspath_extract(seg, i);
if (as > USHRT_MAX) {
u_int32_t a = as >> 16;
if (a >= 10000)
total_size += 5;
else if (a >= 1000)
total_size += 4;
else if (a >= 100)
total_size += 3;
else if (a >= 10)
total_size += 2;
else
total_size += 1;
total_size += 1; /* dot between hi & lo */
as &= 0xffff;
}
if (as >= 10000)
total_size += 5;
else if (as >= 1000)
total_size += 4;
else if (as >= 100)
total_size += 3;
else if (as >= 10)
total_size += 2;
else
total_size += 1;
if (i + 1 < seg_len)
total_size += 1;
}
if (seg_type == AS_SET)
total_size += 2;
}
return (total_size);
}
/*
* Extract the asnum out of the as segment at the specified position.
* Direct access is not possible because of non-aligned reads.
* ATTENTION: no bounds checks are done.
*/
u_int32_t
aspath_extract(const void *seg, int pos)
{
const u_char *ptr = seg;
u_int32_t as;
ptr += 2 + sizeof(u_int32_t) * pos;
memcpy(&as, ptr, sizeof(u_int32_t));
return (ntohl(as));
}
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