usr.sbin/traceroute/as.c

   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 }