1 /* $FreeBSD$ */
2 /* $NetBSD: as.c,v 1.1 2001/11/04 23:14:36 atatat Exp $ */
3
4 /*
5 * Copyright (c) 2001 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Andrew Brown.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38 #include <netdb.h>
39 #include <unistd.h>
40 #include <string.h>
41 #include <stdlib.h>
42 #include <errno.h>
43 #include <err.h>
44 #include <stdio.h>
45
46 #include "as.h"
47
48 #define DEFAULT_AS_SERVER "whois.radb.net"
49 #undef AS_DEBUG_FILE
50
51 struct aslookup {
52 FILE *as_f;
53 #ifdef AS_DEBUG_FILE
54 FILE *as_debug;
55 #endif /* AS_DEBUG_FILE */
56 };
57
58 void *
as_setup(const char * server)59 as_setup(const char *server)
60 {
61 struct aslookup *asn;
62 struct addrinfo hints, *res0, *res;
63 FILE *f;
64 int s, error;
65
66 s = -1;
67 if (server == NULL)
68 server = getenv("RA_SERVER");
69 if (server == NULL)
70 server = DEFAULT_AS_SERVER;
71
72 memset(&hints, 0, sizeof(hints));
73 hints.ai_family = PF_UNSPEC;
74 hints.ai_socktype = SOCK_STREAM;
75 error = getaddrinfo(server, "whois", &hints, &res0);
76 if (error == EAI_SERVICE) {
77 warnx("warning: whois/tcp service not found");
78 error = getaddrinfo(server, "43", &hints, &res0);
79 }
80 if (error != 0) {
81 warnx("%s: %s", server, gai_strerror(error));
82 return (NULL);
83 }
84
85 for (res = res0; res; res = res->ai_next) {
86 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
87 if (s < 0)
88 continue;
89 if (connect(s, res->ai_addr, res->ai_addrlen) >= 0)
90 break;
91 close(s);
92 s = -1;
93 }
94 freeaddrinfo(res0);
95 if (s < 0) {
96 warn("connect");
97 return (NULL);
98 }
99
100 f = fdopen(s, "r+");
101 (void)fprintf(f, "!!\n");
102 (void)fflush(f);
103
104 asn = malloc(sizeof(struct aslookup));
105 if (asn == NULL)
106 (void)fclose(f);
107 else
108 asn->as_f = f;
109
110 #ifdef AS_DEBUG_FILE
111 asn->as_debug = fopen(AS_DEBUG_FILE, "w");
112 if (asn->as_debug) {
113 (void)fprintf(asn->as_debug, ">> !!\n");
114 (void)fflush(asn->as_debug);
115 }
116 #endif /* AS_DEBUG_FILE */
117
118 return (asn);
119 }
120
121 unsigned int
as_lookup(void * _asn,char * addr,sa_family_t family)122 as_lookup(void *_asn, char *addr, sa_family_t family)
123 {
124 struct aslookup *asn = _asn;
125 char buf[1024];
126 unsigned int as;
127 int rc, dlen, plen;
128
129 as = 0;
130 rc = dlen = 0;
131 plen = (family == AF_INET6) ? 128 : 32;
132 (void)fprintf(asn->as_f, "!r%s/%d,l\n", addr, plen);
133 (void)fflush(asn->as_f);
134
135 #ifdef AS_DEBUG_FILE
136 if (asn->as_debug) {
137 (void)fprintf(asn->as_debug, ">> !r%s/%d,l\n", addr, plen);
138 (void)fflush(asn->as_debug);
139 }
140 #endif /* AS_DEBUG_FILE */
141
142 while (fgets(buf, sizeof(buf), asn->as_f) != NULL) {
143 buf[sizeof(buf) - 1] = '\0';
144
145 #ifdef AS_DEBUG_FILE
146 if (asn->as_debug) {
147 (void)fprintf(asn->as_debug, "<< %s", buf);
148 (void)fflush(asn->as_debug);
149 }
150 #endif /* AS_DEBUG_FILE */
151
152 if (rc == 0) {
153 rc = buf[0];
154 switch (rc) {
155 case 'A':
156 /* A - followed by # bytes of answer */
157 sscanf(buf, "A%d\n", &dlen);
158 #ifdef AS_DEBUG_FILE
159 if (asn->as_debug) {
160 (void)fprintf(asn->as_debug,
161 "dlen: %d\n", dlen);
162 (void)fflush(asn->as_debug);
163 }
164 #endif /* AS_DEBUG_FILE */
165 break;
166 case 'C':
167 case 'D':
168 case 'E':
169 case 'F':
170 /* C - no data returned */
171 /* D - key not found */
172 /* E - multiple copies of key */
173 /* F - some other error */
174 break;
175 }
176 if (rc == 'A')
177 /* skip to next input line */
178 continue;
179 }
180
181 if (dlen == 0)
182 /* out of data, next char read is end code */
183 rc = buf[0];
184 if (rc != 'A')
185 /* either an error off the bat, or a done code */
186 break;
187
188 /* data received, thank you */
189 dlen -= strlen(buf);
190
191 /* origin line is the interesting bit */
192 if (as == 0 && strncasecmp(buf, "origin:", 7) == 0) {
193 sscanf(buf + 7, " AS%u", &as);
194 #ifdef AS_DEBUG_FILE
195 if (asn->as_debug) {
196 (void)fprintf(asn->as_debug, "as: %d\n", as);
197 (void)fflush(asn->as_debug);
198 }
199 #endif /* AS_DEBUG_FILE */
200 }
201 }
202
203 return (as);
204 }
205
206 void
as_shutdown(void * _asn)207 as_shutdown(void *_asn)
208 {
209 struct aslookup *asn = _asn;
210
211 (void)fprintf(asn->as_f, "!q\n");
212 (void)fclose(asn->as_f);
213
214 #ifdef AS_DEBUG_FILE
215 if (asn->as_debug) {
216 (void)fprintf(asn->as_debug, ">> !q\n");
217 (void)fclose(asn->as_debug);
218 }
219 #endif /* AS_DEBUG_FILE */
220
221 free(asn);
222 }
223