/* $NetBSD: as.c,v 1.4 2011/05/10 01:52:49 christos Exp $ */
/*
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Brown.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <err.h>
#include <stdio.h>
#include "as.h"
#define DEFAULT_AS_SERVER "whois.radb.net"
#undef AS_DEBUG_FILE
struct aslookup {
FILE *as_f;
#ifdef AS_DEBUG_FILE
FILE *as_debug;
#endif /* AS_DEBUG_FILE */
};
void *
as_setup(const char *server)
{
struct aslookup *asn;
struct addrinfo hints, *res0, *res;
FILE *f;
int s, error;
s = -1;
if (server == NULL)
server = getenv("RA_SERVER");
if (server == NULL)
server = DEFAULT_AS_SERVER;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(server, "whois", &hints, &res0);
if (error == EAI_SERVICE) {
warnx("warning: whois/tcp service not found");
error = getaddrinfo(server, "43", &hints, &res0);
}
if (error != 0) {
warnx("%s: %s", server, gai_strerror(error));
return (NULL);
}
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0)
continue;
if (connect(s, res->ai_addr, res->ai_addrlen) >= 0)
break;
close(s);
s = -1;
}
freeaddrinfo(res0);
if (s < 0) {
warn("connect");
return (NULL);
}
f = fdopen(s, "r+");
(void)fprintf(f, "!!\n");
(void)fflush(f);
asn = malloc(sizeof(struct aslookup));
if (asn == NULL)
(void)fclose(f);
else
asn->as_f = f;
#ifdef AS_DEBUG_FILE
if (asn) {
asn->as_debug = fopen(AS_DEBUG_FILE, "w");
if (asn->as_debug) {
(void)fprintf(asn->as_debug, ">> !!\n");
(void)fflush(asn->as_debug);
}
}
#endif /* AS_DEBUG_FILE */
return (asn);
}
unsigned int
as_lookup(void *_asn, char *addr, sa_family_t family)
{
struct aslookup *asn = _asn;
char buf[1024];
unsigned int as;
int rc, dlen, plen;
as = 0;
rc = dlen = 0;
plen = (family == AF_INET6) ? 128 : 32;
(void)fprintf(asn->as_f, "!r%s/%d,l\n", addr, plen);
(void)fflush(asn->as_f);
#ifdef AS_DEBUG_FILE
if (asn->as_debug) {
(void)fprintf(asn->as_debug, ">> !r%s/%d,l\n", addr, plen);
(void)fflush(asn->as_debug);
}
#endif /* AS_DEBUG_FILE */
while (fgets(buf, sizeof(buf), asn->as_f) != NULL) {
buf[sizeof(buf) - 1] = '\0';
#ifdef AS_DEBUG_FILE
if (asn->as_debug) {
(void)fprintf(asn->as_debug, "<< %s", buf);
(void)fflush(asn->as_debug);
}
#endif /* AS_DEBUG_FILE */
if (rc == 0) {
rc = buf[0];
switch (rc) {
case 'A':
/* A - followed by # bytes of answer */
sscanf(buf, "A%d\n", &dlen);
#ifdef AS_DEBUG_FILE
if (asn->as_debug) {
(void)fprintf(asn->as_debug,
"dlen: %d\n", dlen);
(void)fflush(asn->as_debug);
}
#endif /* AS_DEBUG_FILE */
break;
case 'C':
case 'D':
case 'E':
case 'F':
/* C - no data returned */
/* D - key not found */
/* E - multiple copies of key */
/* F - some other error */
break;
}
if (rc == 'A')
/* skip to next input line */
continue;
}
if (dlen == 0)
/* out of data, next char read is end code */
rc = buf[0];
if (rc != 'A')
/* either an error off the bat, or a done code */
break;
/* data received, thank you */
dlen -= strlen(buf);
/* origin line is the interesting bit */
if (as == 0 && strncasecmp(buf, "origin:", 7) == 0) {
sscanf(buf + 7, " AS%u", &as);
#ifdef AS_DEBUG_FILE
if (asn->as_debug) {
(void)fprintf(asn->as_debug, "as: %d\n", as);
(void)fflush(asn->as_debug);
}
#endif /* AS_DEBUG_FILE */
}
}
return (as);
}
void
as_shutdown(void *_asn)
{
struct aslookup *asn = _asn;
(void)fprintf(asn->as_f, "!q\n");
(void)fclose(asn->as_f);
#ifdef AS_DEBUG_FILE
if (asn->as_debug) {
(void)fprintf(asn->as_debug, ">> !q\n");
(void)fclose(asn->as_debug);
}
#endif /* AS_DEBUG_FILE */
free(asn);
}
