| /* |
| * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the project nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| /* |
| * Issues to be discussed: |
| * - Thread safe-ness must be checked |
| * - Return values. There seems to be no standard for return value (RFC2553) |
| * but INRIA implementation returns EAI_xxx defined for getaddrinfo(). |
| * - RFC2553 says that we should raise error on short buffer. X/Open says |
| * we need to truncate the result. We obey RFC2553 (and X/Open should be |
| * modified). |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/missing/getnameinfo.c,v 1.11 2003-11-16 09:36:49 guy Exp $"; |
| #endif |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <net/if.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <arpa/nameser.h> |
| #include <netdb.h> |
| #include <resolv.h> |
| #include <string.h> |
| #include <stddef.h> |
| #include <errno.h> |
| |
| #ifdef NEED_ADDRINFO_H |
| #include "addrinfo.h" |
| #endif |
| |
| #define SUCCESS 0 |
| #define ANY 0 |
| #define YES 1 |
| #define NO 0 |
| |
| static struct afd { |
| int a_af; |
| int a_addrlen; |
| int a_socklen; |
| int a_off; |
| } afdl [] = { |
| #ifdef INET6 |
| {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), |
| offsetof(struct sockaddr_in6, sin6_addr)}, |
| #endif |
| {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), |
| offsetof(struct sockaddr_in, sin_addr)}, |
| {0, 0, 0}, |
| }; |
| |
| struct sockinet { |
| u_char si_len; |
| u_char si_family; |
| u_short si_port; |
| }; |
| |
| #define ENI_NOSOCKET 0 |
| #define ENI_NOSERVNAME 1 |
| #define ENI_NOHOSTNAME 2 |
| #define ENI_MEMORY 3 |
| #define ENI_SYSTEM 4 |
| #define ENI_FAMILY 5 |
| #define ENI_SALEN 6 |
| |
| int |
| getnameinfo(sa, salen, host, hostlen, serv, servlen, flags) |
| const struct sockaddr *sa; |
| size_t salen; |
| char *host; |
| size_t hostlen; |
| char *serv; |
| size_t servlen; |
| int flags; |
| { |
| struct afd *afd; |
| struct servent *sp; |
| struct hostent *hp; |
| u_short port; |
| int family, i; |
| char *addr, *p; |
| u_int32_t v4a; |
| int h_error; |
| char numserv[512]; |
| char numaddr[512]; |
| |
| if (sa == NULL) |
| return ENI_NOSOCKET; |
| |
| #ifdef HAVE_SA_LEN /*XXX*/ |
| if (sa->sa_len != salen) |
| return ENI_SALEN; |
| #endif |
| |
| family = sa->sa_family; |
| for (i = 0; afdl[i].a_af; i++) |
| if (afdl[i].a_af == family) { |
| afd = &afdl[i]; |
| goto found; |
| } |
| return ENI_FAMILY; |
| |
| found: |
| if (salen != afd->a_socklen) |
| return ENI_SALEN; |
| |
| port = ((struct sockinet *)sa)->si_port; /* network byte order */ |
| addr = (char *)sa + afd->a_off; |
| |
| if (serv == NULL || servlen == 0) { |
| /* |
| * do nothing in this case. |
| * in case you are wondering if "&&" is more correct than |
| * "||" here: RFC2553 says that serv == NULL OR servlen == 0 |
| * means that the caller does not want the result. |
| */ |
| } else { |
| if (flags & NI_NUMERICSERV) |
| sp = NULL; |
| else { |
| sp = getservbyport(port, |
| (flags & NI_DGRAM) ? "udp" : "tcp"); |
| } |
| if (sp) { |
| if (strlen(sp->s_name) + 1 > servlen) |
| return ENI_MEMORY; |
| strcpy(serv, sp->s_name); |
| } else { |
| snprintf(numserv, sizeof(numserv), "%d", ntohs(port)); |
| if (strlen(numserv) + 1 > servlen) |
| return ENI_MEMORY; |
| strcpy(serv, numserv); |
| } |
| } |
| |
| switch (sa->sa_family) { |
| case AF_INET: |
| v4a = (u_int32_t) |
| ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); |
| if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a)) |
| flags |= NI_NUMERICHOST; |
| v4a >>= IN_CLASSA_NSHIFT; |
| if (v4a == 0) |
| flags |= NI_NUMERICHOST; |
| break; |
| #ifdef INET6 |
| case AF_INET6: |
| { |
| struct sockaddr_in6 *sin6; |
| sin6 = (struct sockaddr_in6 *)sa; |
| switch (sin6->sin6_addr.s6_addr[0]) { |
| case 0x00: |
| if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) |
| ; |
| else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) |
| ; |
| else |
| flags |= NI_NUMERICHOST; |
| break; |
| default: |
| if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { |
| flags |= NI_NUMERICHOST; |
| } |
| else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) |
| flags |= NI_NUMERICHOST; |
| break; |
| } |
| } |
| break; |
| #endif |
| } |
| if (host == NULL || hostlen == 0) { |
| /* |
| * do nothing in this case. |
| * in case you are wondering if "&&" is more correct than |
| * "||" here: RFC2553 says that host == NULL OR hostlen == 0 |
| * means that the caller does not want the result. |
| */ |
| } else if (flags & NI_NUMERICHOST) { |
| /* NUMERICHOST and NAMEREQD conflicts with each other */ |
| if (flags & NI_NAMEREQD) |
| return ENI_NOHOSTNAME; |
| if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr)) |
| == NULL) |
| return ENI_SYSTEM; |
| if (strlen(numaddr) + 1 > hostlen) |
| return ENI_MEMORY; |
| strcpy(host, numaddr); |
| #if defined(INET6) && defined(NI_WITHSCOPEID) |
| if (afd->a_af == AF_INET6 && |
| (IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr) || |
| IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr)) && |
| ((struct sockaddr_in6 *)sa)->sin6_scope_id) { |
| #ifndef ALWAYS_WITHSCOPE |
| if (flags & NI_WITHSCOPEID) |
| #endif /* !ALWAYS_WITHSCOPE */ |
| { |
| char *ep = strchr(host, '\0'); |
| unsigned int ifindex = |
| ((struct sockaddr_in6 *)sa)->sin6_scope_id; |
| |
| *ep = SCOPE_DELIMITER; |
| if ((if_indextoname(ifindex, ep + 1)) == NULL) |
| /* XXX what should we do? */ |
| strncpy(ep + 1, "???", 3); |
| } |
| } |
| #endif /* INET6 */ |
| } else { |
| #ifdef USE_GETIPNODEBY |
| hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error); |
| #else |
| hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af); |
| #ifdef HAVE_H_ERRNO |
| h_error = h_errno; |
| #else |
| h_error = EINVAL; |
| #endif |
| #endif |
| |
| if (hp) { |
| if (flags & NI_NOFQDN) { |
| p = strchr(hp->h_name, '.'); |
| if (p) *p = '\0'; |
| } |
| if (strlen(hp->h_name) + 1 > hostlen) { |
| #ifdef USE_GETIPNODEBY |
| freehostent(hp); |
| #endif |
| return ENI_MEMORY; |
| } |
| strcpy(host, hp->h_name); |
| #ifdef USE_GETIPNODEBY |
| freehostent(hp); |
| #endif |
| } else { |
| if (flags & NI_NAMEREQD) |
| return ENI_NOHOSTNAME; |
| if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr)) |
| == NULL) |
| return ENI_NOHOSTNAME; |
| if (strlen(numaddr) + 1 > hostlen) |
| return ENI_MEMORY; |
| strcpy(host, numaddr); |
| } |
| } |
| return SUCCESS; |
| } |