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getnameinfo.c
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/* * 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 (RFC2133) * but INRIA implementation returns EAI_xxx defined for getaddrinfo(). */ #if 0 #include <sys/types.h> #include <sys/socket.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 "addrinfo.h" #endif #define SUCCESS 0 #define YES 1 #define NO 0 static struct gni_afd { int a_af; int a_addrlen; int a_socklen; int a_off; } gni_afdl [] = { #ifdef ENABLE_IPV6 {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 gni_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 /* forward declaration to make gcc happy */ int getnameinfo(const struct sockaddr *, size_t, char *, size_t, char *, size_t, int); 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 gni_afd *gni_afd; struct servent *sp; struct hostent *hp; u_short port; int family, len, i; char *addr, *p; u_long v4a; #ifdef ENABLE_IPV6 u_char pfx; #endif int h_error; char numserv[512]; char numaddr[512]; if (sa == NULL) return ENI_NOSOCKET; #ifdef HAVE_SOCKADDR_SA_LEN len = sa->sa_len; if (len != salen) return ENI_SALEN; #else len = salen; #endif family = sa->sa_family; for (i = 0; gni_afdl[i].a_af; i++) if (gni_afdl[i].a_af == family) { gni_afd = &gni_afdl[i]; goto found; } return ENI_FAMILY; found: if (len != gni_afd->a_socklen) return ENI_SALEN; port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */ addr = (char *)sa + gni_afd->a_off; if (serv == NULL || servlen == 0) { /* what we should do? */ } else if (flags & NI_NUMERICSERV) { sprintf(numserv, "%d", ntohs(port)); if (strlen(numserv) > servlen) return ENI_MEMORY; strcpy(serv, numserv); } else { sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp"); if (sp) { if (strlen(sp->s_name) > servlen) return ENI_MEMORY; strcpy(serv, sp->s_name); } else return ENI_NOSERVNAME; } switch (sa->sa_family) { case AF_INET: v4a = ((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 || v4a == IN_LOOPBACKNET) flags |= NI_NUMERICHOST; break; #ifdef ENABLE_IPV6 case AF_INET6: pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0]; if (pfx == 0 || pfx == 0xfe || pfx == 0xff) flags |= NI_NUMERICHOST; break; #endif } if (host == NULL || hostlen == 0) { /* what should we do? */ } else if (flags & NI_NUMERICHOST) { if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) == NULL) return ENI_SYSTEM; if (strlen(numaddr) > hostlen) return ENI_MEMORY; strcpy(host, numaddr); } else { #ifdef ENABLE_IPV6 hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error); #else hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af); h_error = h_errno; #endif if (hp) { if (flags & NI_NOFQDN) { p = strchr(hp->h_name, '.'); if (p) *p = '\0'; } if (strlen(hp->h_name) > hostlen) { #ifdef ENABLE_IPV6 freehostent(hp); #endif return ENI_MEMORY; } strcpy(host, hp->h_name); #ifdef ENABLE_IPV6 freehostent(hp); #endif } else { if (flags & NI_NAMEREQD) return ENI_NOHOSTNAME; if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) == NULL) return ENI_NOHOSTNAME; if (strlen(numaddr) > hostlen) return ENI_MEMORY; strcpy(host, numaddr); } } return SUCCESS; }