/* * 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(). */ #include "config.h" #include #include #ifndef _WIN32 #if defined(__BEOS__) # include #else # include #endif #include #if defined(HAVE_ARPA_INET_H) #include #endif #if defined(HAVE_ARPA_NAMESER_H) #include #endif #include #if defined(HAVE_RESOLV_H) #include #endif #endif #ifdef _WIN32 #include #define snprintf _snprintf #endif #include #include #ifdef SOCKS5 #include #endif #include "addrinfo.h" #include "sockport.h" #define SUCCESS 0 #define ANY 0 #define YES 1 #define NO 0 struct sockinet { u_char si_len; u_char si_family; u_short si_port; }; static struct afd { int a_af; int a_addrlen; int a_socklen; int a_off; } afdl [] = { #ifdef INET6 #define N_INET6 0 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), offsetof(struct sockaddr_in6, sin6_addr)}, #define N_INET 1 #else #define N_INET 0 #endif {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), offsetof(struct sockaddr_in, sin_addr)}, {0, 0, 0, 0}, }; #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 #ifndef HAVE_INET_NTOP static const char * inet_ntop(af, addr, numaddr, numaddr_len) int af; const void *addr; char *numaddr; size_t numaddr_len; { #ifdef HAVE_INET_NTOA struct in_addr in; memcpy(&in.s_addr, addr, sizeof(in.s_addr)); snprintf(numaddr, numaddr_len, "%s", inet_ntoa(in)); #else unsigned long x = ntohl(*(unsigned long*)addr); snprintf(numaddr, numaddr_len, "%d.%d.%d.%d", (int) (x>>24) & 0xff, (int) (x>>16) & 0xff, (int) (x>> 8) & 0xff, (int) (x>> 0) & 0xff); #endif return numaddr; } #endif 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, len, i; char *addr, *p; u_long v4a; #ifdef INET6 u_char pfx; #endif int h_error; char numserv[512]; char numaddr[512]; if (sa == NULL) return ENI_NOSOCKET; len = SA_LEN(sa); if (len != salen) return ENI_SALEN; 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 (len != 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) { /* what we should do? */ } else if (flags & NI_NUMERICSERV) { snprintf(numserv, sizeof(numserv), "%d", ntohs(port)); if (strlen(numserv) + 1 > servlen) return ENI_MEMORY; strcpy(serv, numserv); } else { #if defined(HAVE_GETSERVBYPORT) 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 return ENI_NOSERVNAME; #else return ENI_NOSERVNAME; #endif } switch (sa->sa_family) { case AF_INET: v4a = 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: #ifdef HAVE_ADDR8 pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr8[0]; #else pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0]; #endif 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(afd->a_af, addr, numaddr, sizeof(numaddr)) == NULL) return ENI_SYSTEM; if (strlen(numaddr) > hostlen) return ENI_MEMORY; strcpy(host, numaddr); } else { #ifdef INET6 hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error); #else hp = gethostbyaddr(addr, afd->a_addrlen, 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) + 1 > hostlen) { #ifdef INET6 freehostent(hp); #endif return ENI_MEMORY; } strcpy(host, hp->h_name); #ifdef INET6 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) > hostlen) return ENI_MEMORY; strcpy(host, numaddr); } } return SUCCESS; }