156893Sfenner/* 256893Sfenner * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 356893Sfenner * All rights reserved. 4127668Sbms * 556893Sfenner * Redistribution and use in source and binary forms, with or without 656893Sfenner * modification, are permitted provided that the following conditions 756893Sfenner * are met: 856893Sfenner * 1. Redistributions of source code must retain the above copyright 956893Sfenner * notice, this list of conditions and the following disclaimer. 1056893Sfenner * 2. Redistributions in binary form must reproduce the above copyright 1156893Sfenner * notice, this list of conditions and the following disclaimer in the 1256893Sfenner * documentation and/or other materials provided with the distribution. 1356893Sfenner * 3. Neither the name of the project nor the names of its contributors 1456893Sfenner * may be used to endorse or promote products derived from this software 1556893Sfenner * without specific prior written permission. 16127668Sbms * 1756893Sfenner * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1856893Sfenner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1956893Sfenner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2056893Sfenner * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2156893Sfenner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2256893Sfenner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2356893Sfenner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2456893Sfenner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2556893Sfenner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2656893Sfenner * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2756893Sfenner * SUCH DAMAGE. 2856893Sfenner */ 2956893Sfenner 3056893Sfenner/* 3156893Sfenner * Issues to be discussed: 3256893Sfenner * - Thread safe-ness must be checked 3356893Sfenner * - Return values. There seems to be no standard for return value (RFC2553) 3456893Sfenner * but INRIA implementation returns EAI_xxx defined for getaddrinfo(). 3556893Sfenner * - RFC2553 says that we should raise error on short buffer. X/Open says 3656893Sfenner * we need to truncate the result. We obey RFC2553 (and X/Open should be 3756893Sfenner * modified). 3856893Sfenner */ 3956893Sfenner 4056893Sfenner#ifdef HAVE_CONFIG_H 4156893Sfenner#include <config.h> 42127668Sbms#endif 4356893Sfenner 4456893Sfenner#ifndef lint 45127668Sbmsstatic const char rcsid[] _U_ = 46190207Srpaulo "@(#) $Header: /tcpdump/master/tcpdump/missing/getnameinfo.c,v 1.11 2003-11-16 09:36:49 guy Exp $"; 4756893Sfenner#endif 4856893Sfenner 4956893Sfenner#include <sys/types.h> 5056893Sfenner#include <sys/socket.h> 5156893Sfenner#include <net/if.h> 5256893Sfenner#include <netinet/in.h> 5356893Sfenner#include <arpa/inet.h> 5456893Sfenner#include <arpa/nameser.h> 5556893Sfenner#include <netdb.h> 5656893Sfenner#include <resolv.h> 5756893Sfenner#include <string.h> 5856893Sfenner#include <stddef.h> 5956893Sfenner#include <errno.h> 6056893Sfenner 6156893Sfenner#ifdef NEED_ADDRINFO_H 6256893Sfenner#include "addrinfo.h" 6356893Sfenner#endif 6456893Sfenner 6556893Sfenner#define SUCCESS 0 6656893Sfenner#define ANY 0 6756893Sfenner#define YES 1 6856893Sfenner#define NO 0 6956893Sfenner 7056893Sfennerstatic struct afd { 7156893Sfenner int a_af; 7256893Sfenner int a_addrlen; 7356893Sfenner int a_socklen; 7456893Sfenner int a_off; 7556893Sfenner} afdl [] = { 7656893Sfenner#ifdef INET6 7756893Sfenner {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), 7856893Sfenner offsetof(struct sockaddr_in6, sin6_addr)}, 7956893Sfenner#endif 8056893Sfenner {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), 8156893Sfenner offsetof(struct sockaddr_in, sin_addr)}, 8256893Sfenner {0, 0, 0}, 8356893Sfenner}; 8456893Sfenner 8556893Sfennerstruct sockinet { 8656893Sfenner u_char si_len; 8756893Sfenner u_char si_family; 8856893Sfenner u_short si_port; 8956893Sfenner}; 9056893Sfenner 9156893Sfenner#define ENI_NOSOCKET 0 9256893Sfenner#define ENI_NOSERVNAME 1 9356893Sfenner#define ENI_NOHOSTNAME 2 9456893Sfenner#define ENI_MEMORY 3 9556893Sfenner#define ENI_SYSTEM 4 9656893Sfenner#define ENI_FAMILY 5 9756893Sfenner#define ENI_SALEN 6 9856893Sfenner 9956893Sfennerint 10056893Sfennergetnameinfo(sa, salen, host, hostlen, serv, servlen, flags) 10156893Sfenner const struct sockaddr *sa; 10256893Sfenner size_t salen; 10356893Sfenner char *host; 10456893Sfenner size_t hostlen; 10556893Sfenner char *serv; 10656893Sfenner size_t servlen; 10756893Sfenner int flags; 10856893Sfenner{ 10956893Sfenner struct afd *afd; 11056893Sfenner struct servent *sp; 11156893Sfenner struct hostent *hp; 11256893Sfenner u_short port; 11356893Sfenner int family, i; 11456893Sfenner char *addr, *p; 11556893Sfenner u_int32_t v4a; 11656893Sfenner int h_error; 11756893Sfenner char numserv[512]; 11856893Sfenner char numaddr[512]; 11956893Sfenner 12056893Sfenner if (sa == NULL) 12156893Sfenner return ENI_NOSOCKET; 12256893Sfenner 12356893Sfenner#ifdef HAVE_SA_LEN /*XXX*/ 12456893Sfenner if (sa->sa_len != salen) 12556893Sfenner return ENI_SALEN; 12656893Sfenner#endif 127127668Sbms 12856893Sfenner family = sa->sa_family; 12956893Sfenner for (i = 0; afdl[i].a_af; i++) 13056893Sfenner if (afdl[i].a_af == family) { 13156893Sfenner afd = &afdl[i]; 13256893Sfenner goto found; 13356893Sfenner } 13456893Sfenner return ENI_FAMILY; 135127668Sbms 13656893Sfenner found: 13756893Sfenner if (salen != afd->a_socklen) 13856893Sfenner return ENI_SALEN; 139127668Sbms 14056893Sfenner port = ((struct sockinet *)sa)->si_port; /* network byte order */ 14156893Sfenner addr = (char *)sa + afd->a_off; 14256893Sfenner 14356893Sfenner if (serv == NULL || servlen == 0) { 14456893Sfenner /* 14556893Sfenner * do nothing in this case. 14656893Sfenner * in case you are wondering if "&&" is more correct than 14756893Sfenner * "||" here: RFC2553 says that serv == NULL OR servlen == 0 14856893Sfenner * means that the caller does not want the result. 14956893Sfenner */ 15056893Sfenner } else { 15156893Sfenner if (flags & NI_NUMERICSERV) 15256893Sfenner sp = NULL; 15356893Sfenner else { 15456893Sfenner sp = getservbyport(port, 15556893Sfenner (flags & NI_DGRAM) ? "udp" : "tcp"); 15656893Sfenner } 15756893Sfenner if (sp) { 15875115Sfenner if (strlen(sp->s_name) + 1 > servlen) 15956893Sfenner return ENI_MEMORY; 16056893Sfenner strcpy(serv, sp->s_name); 16156893Sfenner } else { 16275115Sfenner snprintf(numserv, sizeof(numserv), "%d", ntohs(port)); 16375115Sfenner if (strlen(numserv) + 1 > servlen) 16456893Sfenner return ENI_MEMORY; 16556893Sfenner strcpy(serv, numserv); 16656893Sfenner } 16756893Sfenner } 16856893Sfenner 16956893Sfenner switch (sa->sa_family) { 17056893Sfenner case AF_INET: 17156893Sfenner v4a = (u_int32_t) 17256893Sfenner ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 17356893Sfenner if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a)) 17456893Sfenner flags |= NI_NUMERICHOST; 17556893Sfenner v4a >>= IN_CLASSA_NSHIFT; 17656893Sfenner if (v4a == 0) 177127668Sbms flags |= NI_NUMERICHOST; 17856893Sfenner break; 17956893Sfenner#ifdef INET6 18056893Sfenner case AF_INET6: 18156893Sfenner { 18256893Sfenner struct sockaddr_in6 *sin6; 18356893Sfenner sin6 = (struct sockaddr_in6 *)sa; 18456893Sfenner switch (sin6->sin6_addr.s6_addr[0]) { 18556893Sfenner case 0x00: 18656893Sfenner if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 18756893Sfenner ; 18856893Sfenner else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 18956893Sfenner ; 19056893Sfenner else 19156893Sfenner flags |= NI_NUMERICHOST; 19256893Sfenner break; 19356893Sfenner default: 19456893Sfenner if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { 19556893Sfenner flags |= NI_NUMERICHOST; 19656893Sfenner } 19756893Sfenner else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 19856893Sfenner flags |= NI_NUMERICHOST; 19956893Sfenner break; 20056893Sfenner } 20156893Sfenner } 20256893Sfenner break; 20356893Sfenner#endif 20456893Sfenner } 20556893Sfenner if (host == NULL || hostlen == 0) { 20656893Sfenner /* 20756893Sfenner * do nothing in this case. 20856893Sfenner * in case you are wondering if "&&" is more correct than 20956893Sfenner * "||" here: RFC2553 says that host == NULL OR hostlen == 0 21056893Sfenner * means that the caller does not want the result. 21156893Sfenner */ 21256893Sfenner } else if (flags & NI_NUMERICHOST) { 21356893Sfenner /* NUMERICHOST and NAMEREQD conflicts with each other */ 21456893Sfenner if (flags & NI_NAMEREQD) 21556893Sfenner return ENI_NOHOSTNAME; 21656893Sfenner if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr)) 21756893Sfenner == NULL) 21856893Sfenner return ENI_SYSTEM; 21975115Sfenner if (strlen(numaddr) + 1 > hostlen) 22056893Sfenner return ENI_MEMORY; 22156893Sfenner strcpy(host, numaddr); 22256893Sfenner#if defined(INET6) && defined(NI_WITHSCOPEID) 22356893Sfenner if (afd->a_af == AF_INET6 && 22456893Sfenner (IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr) || 22556893Sfenner IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr)) && 22656893Sfenner ((struct sockaddr_in6 *)sa)->sin6_scope_id) { 22756893Sfenner#ifndef ALWAYS_WITHSCOPE 22856893Sfenner if (flags & NI_WITHSCOPEID) 22956893Sfenner#endif /* !ALWAYS_WITHSCOPE */ 23056893Sfenner { 23156893Sfenner char *ep = strchr(host, '\0'); 23256893Sfenner unsigned int ifindex = 23356893Sfenner ((struct sockaddr_in6 *)sa)->sin6_scope_id; 23456893Sfenner 23556893Sfenner *ep = SCOPE_DELIMITER; 23656893Sfenner if ((if_indextoname(ifindex, ep + 1)) == NULL) 23756893Sfenner /* XXX what should we do? */ 23856893Sfenner strncpy(ep + 1, "???", 3); 23956893Sfenner } 24056893Sfenner } 24156893Sfenner#endif /* INET6 */ 24256893Sfenner } else { 24356893Sfenner#ifdef USE_GETIPNODEBY 24456893Sfenner hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error); 24556893Sfenner#else 24656893Sfenner hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af); 24756893Sfenner#ifdef HAVE_H_ERRNO 24856893Sfenner h_error = h_errno; 24956893Sfenner#else 25056893Sfenner h_error = EINVAL; 25156893Sfenner#endif 25256893Sfenner#endif 25356893Sfenner 25456893Sfenner if (hp) { 25556893Sfenner if (flags & NI_NOFQDN) { 25656893Sfenner p = strchr(hp->h_name, '.'); 25756893Sfenner if (p) *p = '\0'; 25856893Sfenner } 25975115Sfenner if (strlen(hp->h_name) + 1 > hostlen) { 26056893Sfenner#ifdef USE_GETIPNODEBY 26156893Sfenner freehostent(hp); 26256893Sfenner#endif 26356893Sfenner return ENI_MEMORY; 26456893Sfenner } 26556893Sfenner strcpy(host, hp->h_name); 26656893Sfenner#ifdef USE_GETIPNODEBY 26756893Sfenner freehostent(hp); 26856893Sfenner#endif 26956893Sfenner } else { 27056893Sfenner if (flags & NI_NAMEREQD) 27156893Sfenner return ENI_NOHOSTNAME; 27256893Sfenner if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr)) 27356893Sfenner == NULL) 27456893Sfenner return ENI_NOHOSTNAME; 27575115Sfenner if (strlen(numaddr) + 1 > hostlen) 27656893Sfenner return ENI_MEMORY; 27756893Sfenner strcpy(host, numaddr); 27856893Sfenner } 27956893Sfenner } 28056893Sfenner return SUCCESS; 28156893Sfenner} 282