1 /* 2 * Issues to be discussed: 3 * - Thread safe-ness must be checked 4 */ 5 6 #if ( defined(__linux__) || defined(__linux) || defined(LINUX) ) 7 #ifndef IF_NAMESIZE 8 # ifdef IFNAMSIZ 9 # define IF_NAMESIZE IFNAMSIZ 10 # else 11 # define IF_NAMESIZE 16 12 # endif 13 #endif 14 #endif 15 16 /* 17 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 18 * All rights reserved. 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 2. Redistributions in binary form must reproduce the above copyright 26 * notice, this list of conditions and the following disclaimer in the 27 * documentation and/or other materials provided with the distribution. 28 * 3. All advertising materials mentioning features or use of this software 29 * must display the following acknowledgement: 30 * This product includes software developed by WIDE Project and 31 * its contributors. 32 * 4. Neither the name of the project nor the names of its contributors 33 * may be used to endorse or promote products derived from this software 34 * without specific prior written permission. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 */ 48 49 #include <port_before.h> 50 51 #include <sys/types.h> 52 #include <sys/socket.h> 53 54 #include <netinet/in.h> 55 #include <arpa/nameser.h> 56 #include <arpa/inet.h> 57 #include <net/if.h> 58 59 #include <netdb.h> 60 #include <resolv.h> 61 #include <string.h> 62 #include <stddef.h> 63 64 #include <port_after.h> 65 66 /*% 67 * Note that a_off will be dynamically adjusted so that to be consistent 68 * with the definition of sockaddr_in{,6}. 69 * The value presented below is just a guess. 70 */ 71 static struct afd { 72 int a_af; 73 int a_addrlen; 74 size_t a_socklen; 75 int a_off; 76 } afdl [] = { 77 /* first entry is linked last... */ 78 {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), 79 offsetof(struct sockaddr_in, sin_addr)}, 80 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), 81 offsetof(struct sockaddr_in6, sin6_addr)}, 82 {0, 0, 0, 0}, 83 }; 84 85 struct sockinet { 86 #ifdef HAVE_SA_LEN 87 u_char si_len; 88 #endif 89 u_char si_family; 90 u_short si_port; 91 }; 92 93 static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *, 94 size_t, int)); 95 #ifdef HAVE_SIN6_SCOPE_ID 96 static int ip6_sa2str __P((const struct sockaddr_in6 *, char *, size_t, int)); 97 #endif 98 99 int 100 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags) 101 const struct sockaddr *sa; 102 size_t salen; 103 char *host; 104 size_t hostlen; 105 char *serv; 106 size_t servlen; 107 int flags; 108 { 109 struct afd *afd; 110 struct servent *sp; 111 struct hostent *hp; 112 u_short port; 113 #ifdef HAVE_SA_LEN 114 size_t len; 115 #endif 116 int family, i; 117 const char *addr; 118 char *p; 119 char numserv[512]; 120 char numaddr[512]; 121 const struct sockaddr_in6 *sin6; 122 123 if (sa == NULL) 124 return EAI_FAIL; 125 126 #ifdef HAVE_SA_LEN 127 len = sa->sa_len; 128 if (len != salen) return EAI_FAIL; 129 #endif 130 131 family = sa->sa_family; 132 for (i = 0; afdl[i].a_af; i++) 133 if (afdl[i].a_af == family) { 134 afd = &afdl[i]; 135 goto found; 136 } 137 return EAI_FAMILY; 138 139 found: 140 if (salen != afd->a_socklen) return EAI_FAIL; 141 142 port = ((const struct sockinet *)sa)->si_port; /*%< network byte order */ 143 addr = (const char *)sa + afd->a_off; 144 145 if (serv == NULL || servlen == 0U) { 146 /* 147 * rfc2553bis says that serv == NULL or servlen == 0 means that 148 * the caller does not want the result. 149 */ 150 } else if (flags & NI_NUMERICSERV) { 151 sprintf(numserv, "%d", ntohs(port)); 152 if (strlen(numserv) > servlen) 153 return EAI_MEMORY; 154 strcpy(serv, numserv); 155 } else { 156 sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp"); 157 if (sp) { 158 if (strlen(sp->s_name) + 1 > servlen) 159 return EAI_MEMORY; 160 strcpy(serv, sp->s_name); 161 } else 162 return EAI_NONAME; 163 } 164 165 switch (sa->sa_family) { 166 case AF_INET: 167 if (ntohl(*(const u_int32_t *)addr) >> IN_CLASSA_NSHIFT == 0) 168 flags |= NI_NUMERICHOST; 169 break; 170 case AF_INET6: 171 sin6 = (const struct sockaddr_in6 *)sa; 172 switch (sin6->sin6_addr.s6_addr[0]) { 173 case 0x00: 174 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 175 ; 176 else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 177 ; 178 else 179 flags |= NI_NUMERICHOST; 180 break; 181 default: 182 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 183 flags |= NI_NUMERICHOST; 184 else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 185 flags |= NI_NUMERICHOST; 186 break; 187 } 188 break; 189 } 190 if (host == NULL || hostlen == 0U) { 191 /* 192 * rfc2553bis says that host == NULL or hostlen == 0 means that 193 * the caller does not want the result. 194 */ 195 } else if (flags & NI_NUMERICHOST) { 196 goto numeric; 197 } else { 198 hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af); 199 200 if (hp) { 201 if (flags & NI_NOFQDN) { 202 p = strchr(hp->h_name, '.'); 203 if (p) *p = '\0'; 204 } 205 if (strlen(hp->h_name) + 1 > hostlen) 206 return EAI_MEMORY; 207 strcpy(host, hp->h_name); 208 } else { 209 if (flags & NI_NAMEREQD) 210 return EAI_NONAME; 211 numeric: 212 switch(afd->a_af) { 213 case AF_INET6: 214 { 215 int error; 216 217 if ((error = ip6_parsenumeric(sa, addr, host, 218 hostlen, 219 flags)) != 0) 220 return(error); 221 break; 222 } 223 224 default: 225 if (inet_ntop(afd->a_af, addr, numaddr, 226 sizeof(numaddr)) == NULL) 227 return EAI_NONAME; 228 if (strlen(numaddr) + 1 > hostlen) 229 return EAI_MEMORY; 230 strcpy(host, numaddr); 231 } 232 } 233 } 234 return(0); 235 } 236 237 static int 238 ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host, 239 size_t hostlen, int flags) 240 { 241 size_t numaddrlen; 242 char numaddr[512]; 243 244 #ifndef HAVE_SIN6_SCOPE_ID 245 UNUSED(sa); 246 UNUSED(flags); 247 #endif 248 249 if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) 250 == NULL) 251 return EAI_SYSTEM; 252 253 numaddrlen = strlen(numaddr); 254 if (numaddrlen + 1 > hostlen) /*%< don't forget terminator */ 255 return EAI_MEMORY; 256 strcpy(host, numaddr); 257 258 #ifdef HAVE_SIN6_SCOPE_ID 259 if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) { 260 char scopebuf[MAXHOSTNAMELEN]; /*%< XXX */ 261 int scopelen; 262 263 /* ip6_sa2str never fails */ 264 scopelen = ip6_sa2str((const struct sockaddr_in6 *)sa, 265 scopebuf, sizeof(scopebuf), flags); 266 267 if (scopelen + 1 + numaddrlen + 1 > hostlen) 268 return EAI_MEMORY; 269 270 /* construct <numeric-addr><delim><scopeid> */ 271 memcpy(host + numaddrlen + 1, scopebuf, 272 scopelen); 273 host[numaddrlen] = SCOPE_DELIMITER; 274 host[numaddrlen + 1 + scopelen] = '\0'; 275 } 276 #endif 277 278 return 0; 279 } 280 281 #ifdef HAVE_SIN6_SCOPE_ID 282 /* ARGSUSED */ 283 static int 284 ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf, 285 size_t bufsiz, int flags) 286 { 287 #ifdef USE_IFNAMELINKID 288 unsigned int ifindex = (unsigned int)sa6->sin6_scope_id; 289 const struct in6_addr *a6 = &sa6->sin6_addr; 290 #endif 291 char tmp[64]; 292 293 #ifdef NI_NUMERICSCOPE 294 if (flags & NI_NUMERICSCOPE) { 295 sprintf(tmp, "%u", sa6->sin6_scope_id); 296 if (bufsiz != 0U) { 297 strncpy(buf, tmp, bufsiz - 1); 298 buf[bufsiz - 1] = '\0'; 299 } 300 return(strlen(tmp)); 301 } 302 #endif 303 304 #ifdef USE_IFNAMELINKID 305 /* 306 * For a link-local address, convert the index to an interface 307 * name, assuming a one-to-one mapping between links and interfaces. 308 * Note, however, that this assumption is stronger than the 309 * specification of the scoped address architecture; the 310 * specficication says that more than one interfaces can belong to 311 * a single link. 312 */ 313 314 /* if_indextoname() does not take buffer size. not a good api... */ 315 if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) && 316 bufsiz >= IF_NAMESIZE) { 317 char *p = if_indextoname(ifindex, buf); 318 if (p) { 319 return(strlen(p)); 320 } 321 } 322 #endif 323 324 /* last resort */ 325 sprintf(tmp, "%u", sa6->sin6_scope_id); 326 if (bufsiz != 0U) { 327 strncpy(buf, tmp, bufsiz - 1); 328 buf[bufsiz - 1] = '\0'; 329 } 330 return(strlen(tmp)); 331 } 332 #endif 333 334 /*! \file */ 335