1 /* $NetBSD: as.c,v 1.4 2011/05/10 01:52:49 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Brown. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 #include <netinet/in.h> 36 #include <arpa/inet.h> 37 #include <netdb.h> 38 #include <unistd.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <errno.h> 42 #include <err.h> 43 #include <stdio.h> 44 45 #include "as.h" 46 47 #define DEFAULT_AS_SERVER "whois.radb.net" 48 #undef AS_DEBUG_FILE 49 50 struct aslookup { 51 FILE *as_f; 52 #ifdef AS_DEBUG_FILE 53 FILE *as_debug; 54 #endif /* AS_DEBUG_FILE */ 55 }; 56 57 void * 58 as_setup(const char *server) 59 { 60 struct aslookup *asn; 61 struct addrinfo hints, *res0, *res; 62 FILE *f; 63 int s, error; 64 65 s = -1; 66 if (server == NULL) 67 server = getenv("RA_SERVER"); 68 if (server == NULL) 69 server = DEFAULT_AS_SERVER; 70 71 memset(&hints, 0, sizeof(hints)); 72 hints.ai_family = PF_UNSPEC; 73 hints.ai_socktype = SOCK_STREAM; 74 error = getaddrinfo(server, "whois", &hints, &res0); 75 if (error == EAI_SERVICE) { 76 warnx("warning: whois/tcp service not found"); 77 error = getaddrinfo(server, "43", &hints, &res0); 78 } 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 if (asn) { 112 asn->as_debug = fopen(AS_DEBUG_FILE, "w"); 113 if (asn->as_debug) { 114 (void)fprintf(asn->as_debug, ">> !!\n"); 115 (void)fflush(asn->as_debug); 116 } 117 } 118 #endif /* AS_DEBUG_FILE */ 119 120 return (asn); 121 } 122 123 unsigned int 124 as_lookup(void *_asn, char *addr, sa_family_t family) 125 { 126 struct aslookup *asn = _asn; 127 char buf[1024]; 128 unsigned int as; 129 int rc, dlen, plen; 130 131 as = 0; 132 rc = dlen = 0; 133 plen = (family == AF_INET6) ? 128 : 32; 134 (void)fprintf(asn->as_f, "!r%s/%d,l\n", addr, plen); 135 (void)fflush(asn->as_f); 136 137 #ifdef AS_DEBUG_FILE 138 if (asn->as_debug) { 139 (void)fprintf(asn->as_debug, ">> !r%s/%d,l\n", addr, plen); 140 (void)fflush(asn->as_debug); 141 } 142 #endif /* AS_DEBUG_FILE */ 143 144 while (fgets(buf, sizeof(buf), asn->as_f) != NULL) { 145 buf[sizeof(buf) - 1] = '\0'; 146 147 #ifdef AS_DEBUG_FILE 148 if (asn->as_debug) { 149 (void)fprintf(asn->as_debug, "<< %s", buf); 150 (void)fflush(asn->as_debug); 151 } 152 #endif /* AS_DEBUG_FILE */ 153 154 if (rc == 0) { 155 rc = buf[0]; 156 switch (rc) { 157 case 'A': 158 /* A - followed by # bytes of answer */ 159 sscanf(buf, "A%d\n", &dlen); 160 #ifdef AS_DEBUG_FILE 161 if (asn->as_debug) { 162 (void)fprintf(asn->as_debug, 163 "dlen: %d\n", dlen); 164 (void)fflush(asn->as_debug); 165 } 166 #endif /* AS_DEBUG_FILE */ 167 break; 168 case 'C': 169 case 'D': 170 case 'E': 171 case 'F': 172 /* C - no data returned */ 173 /* D - key not found */ 174 /* E - multiple copies of key */ 175 /* F - some other error */ 176 break; 177 } 178 if (rc == 'A') 179 /* skip to next input line */ 180 continue; 181 } 182 183 if (dlen == 0) 184 /* out of data, next char read is end code */ 185 rc = buf[0]; 186 if (rc != 'A') 187 /* either an error off the bat, or a done code */ 188 break; 189 190 /* data received, thank you */ 191 dlen -= strlen(buf); 192 193 /* origin line is the interesting bit */ 194 if (as == 0 && strncasecmp(buf, "origin:", 7) == 0) { 195 sscanf(buf + 7, " AS%u", &as); 196 #ifdef AS_DEBUG_FILE 197 if (asn->as_debug) { 198 (void)fprintf(asn->as_debug, "as: %d\n", as); 199 (void)fflush(asn->as_debug); 200 } 201 #endif /* AS_DEBUG_FILE */ 202 } 203 } 204 205 return (as); 206 } 207 208 void 209 as_shutdown(void *_asn) 210 { 211 struct aslookup *asn = _asn; 212 213 (void)fprintf(asn->as_f, "!q\n"); 214 (void)fclose(asn->as_f); 215 216 #ifdef AS_DEBUG_FILE 217 if (asn->as_debug) { 218 (void)fprintf(asn->as_debug, ">> !q\n"); 219 (void)fclose(asn->as_debug); 220 } 221 #endif /* AS_DEBUG_FILE */ 222 223 free(asn); 224 } 225
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