235 lines
5.4 KiB
C
235 lines
5.4 KiB
C
/* $NetBSD: as.c,v 1.2 2008/04/28 20:24:17 martin Exp $ */
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/*
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Brown.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <err.h>
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#include <stdio.h>
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#include "as.h"
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#define DEFAULT_AS_SERVER "whois.radb.net"
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#undef AS_DEBUG_FILE
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struct aslookup {
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FILE *as_f;
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#ifdef AS_DEBUG_FILE
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FILE *as_debug;
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#endif /* AS_DEBUG_FILE */
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};
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void *
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as_setup(server)
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char *server;
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{
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struct aslookup *asn;
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struct hostent *he = NULL;
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struct servent *se;
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struct sockaddr_in in;
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FILE *f;
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int s;
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if (server == NULL)
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server = DEFAULT_AS_SERVER;
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(void)memset(&in, 0, sizeof(in));
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in.sin_family = AF_INET;
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in.sin_len = sizeof(in);
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if ((se = getservbyname("whois", "tcp")) == NULL) {
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warnx("warning: whois/tcp service not found");
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in.sin_port = ntohs(43);
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} else
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in.sin_port = se->s_port;
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if (inet_aton(server, &in.sin_addr) == 0 &&
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((he = gethostbyname(server)) == NULL ||
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he->h_addr == NULL)) {
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warnx("%s: %s", server, hstrerror(h_errno));
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return (NULL);
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}
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if ((s = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
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warn("socket");
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return (NULL);
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}
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do {
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if (he != NULL) {
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memcpy(&in.sin_addr, he->h_addr, he->h_length);
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he->h_addr_list++;
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}
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if (connect(s, (struct sockaddr *)&in, sizeof(in)) == 0)
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break;
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if (he == NULL || he->h_addr == NULL) {
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close(s);
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s = -1;
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break;
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}
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} while (1);
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if (s == -1) {
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warn("connect");
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return (NULL);
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}
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f = fdopen(s, "r+");
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(void)fprintf(f, "!!\n");
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(void)fflush(f);
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asn = malloc(sizeof(struct aslookup));
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if (asn == NULL)
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(void)fclose(f);
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else
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asn->as_f = f;
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#ifdef AS_DEBUG_FILE
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asn->as_debug = fopen(AS_DEBUG_FILE, "w");
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if (asn->as_debug) {
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(void)fprintf(asn->as_debug, ">> !!\n");
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(void)fflush(asn->as_debug);
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}
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#endif /* AS_DEBUG_FILE */
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return (asn);
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}
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int
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as_lookup(_asn, addr)
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void *_asn;
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struct in_addr *addr;
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{
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struct aslookup *asn = _asn;
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char buf[1024];
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int as, rc, dlen;
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as = rc = dlen = 0;
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(void)fprintf(asn->as_f, "!r%s/32,l\n", inet_ntoa(*addr));
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(void)fflush(asn->as_f);
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#ifdef AS_DEBUG_FILE
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if (asn->as_debug) {
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(void)fprintf(asn->as_debug, ">> !r%s/32,l\n",
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inet_ntoa(*addr));
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(void)fflush(asn->as_debug);
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}
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#endif /* AS_DEBUG_FILE */
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while (fgets(buf, sizeof(buf), asn->as_f) != NULL) {
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buf[sizeof(buf) - 1] = '\0';
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#ifdef AS_DEBUG_FILE
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if (asn->as_debug) {
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(void)fprintf(asn->as_debug, "<< %s", buf);
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(void)fflush(asn->as_debug);
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}
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#endif /* AS_DEBUG_FILE */
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if (rc == 0) {
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rc = buf[0];
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switch (rc) {
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case 'A':
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/* A - followed by # bytes of answer */
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sscanf(buf, "A%d\n", &dlen);
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#ifdef AS_DEBUG_FILE
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if (asn->as_debug) {
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(void)fprintf(asn->as_debug,
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"dlen: %d\n", dlen);
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(void)fflush(asn->as_debug);
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}
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#endif /* AS_DEBUG_FILE */
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break;
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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/* C - no data returned */
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/* D - key not found */
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/* E - multiple copies of key */
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/* F - some other error */
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break;
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}
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if (rc == 'A')
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/* skip to next input line */
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continue;
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}
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if (dlen == 0)
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/* out of data, next char read is end code */
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rc = buf[0];
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if (rc != 'A')
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/* either an error off the bat, or a done code */
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break;
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/* data received, thank you */
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dlen -= strlen(buf);
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/* origin line is the interesting bit */
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if (as == 0 && strncasecmp(buf, "origin:", 7) == 0) {
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sscanf(buf + 7, " AS%d", &as);
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#ifdef AS_DEBUG_FILE
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if (asn->as_debug) {
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(void)fprintf(asn->as_debug, "as: %d\n", as);
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(void)fflush(asn->as_debug);
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}
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#endif /* AS_DEBUG_FILE */
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}
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}
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return (as);
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}
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void
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as_shutdown(_asn)
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void *_asn;
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{
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struct aslookup *asn = _asn;
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(void)fprintf(asn->as_f, "!q\n");
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(void)fclose(asn->as_f);
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#ifdef AS_DEBUG_FILE
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if (asn->as_debug) {
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(void)fprintf(asn->as_debug, ">> !q\n");
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(void)fclose(asn->as_debug);
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}
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#endif /* AS_DEBUG_FILE */
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free(asn);
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}
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