/* * 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 * - 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). ipngwg rough consensus seems to follow RFC2553. * - What is "local" in NI_FQDN? * - NI_NAMEREQD and NI_NUMERICHOST conflict with each other. * - (KAME extension) always attach textual scopeid (fe80::1%lo0), if * sin6_scope_id is filled - standardization status? * XXX breaks backward compat for code that expects no scopeid. * beware on merge. */ #ifdef _WIN32 #include #include "getaddrinfo.h" #include "getnameinfo.h" static const struct afd { int a_af; int a_addrlen; rb_socklen_t a_socklen; int a_off; } afdl [] = { #ifdef 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, 0}, }; struct sockinet { unsigned char si_len; unsigned char si_family; unsigned short si_port; }; #ifdef IPV6 static int ip6_parsenumeric(const struct sockaddr *, const char *, char *, size_t, int); #endif int rb_getnameinfo(const struct sockaddr *sa, rb_socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) { const struct afd *afd; struct servent *sp; unsigned short port; int family, i; const char *addr; uint32_t v4a; char numserv[512]; char numaddr[512]; if (sa == NULL) return EAI_FAIL; /* if (sa->sa_len != salen) return EAI_FAIL; */ family = sa->sa_family; for (i = 0; afdl[i].a_af; i++) if (afdl[i].a_af == family) { afd = &afdl[i]; goto found; } return EAI_FAMILY; found: if (salen != afd->a_socklen) return EAI_FAIL; /* network byte order */ port = ((const struct sockinet *)sa)->si_port; addr = (const 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: rfc2553bis-03 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 EAI_MEMORY; rb_strlcpy(serv, sp->s_name, servlen); } else { snprintf(numserv, sizeof(numserv), "%u", ntohs(port)); if (strlen(numserv) + 1 > servlen) return EAI_MEMORY; rb_strlcpy(serv, numserv, servlen); } } switch (sa->sa_family) { case AF_INET: v4a = (uint32_t) ntohl(((const 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 IPV6 case AF_INET6: { const struct sockaddr_in6 *sin6; sin6 = (const 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: rfc2553bis-03 says that host == NULL or * hostlen == 0 means that the caller does not want the result. */ } else if (flags & NI_NUMERICHOST) { size_t numaddrlen; /* NUMERICHOST and NAMEREQD conflicts with each other */ if (flags & NI_NAMEREQD) return EAI_NONAME; switch(afd->a_af) { #ifdef IPV6 case AF_INET6: { int error; if ((error = ip6_parsenumeric(sa, addr, host, hostlen, flags)) != 0) return(error); break; } #endif default: if (rb_inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr)) == NULL) return EAI_SYSTEM; numaddrlen = strlen(numaddr); if (numaddrlen + 1 > hostlen) /* don't forget terminator */ return EAI_MEMORY; rb_strlcpy(host, numaddr, hostlen); break; } } return(0); } #ifdef IPV6 static int ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host, size_t hostlen, int flags) { size_t numaddrlen; char numaddr[512]; if (rb_inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL) return(EAI_SYSTEM); numaddrlen = strlen(numaddr); if (numaddrlen + 1 > hostlen) /* don't forget terminator */ return(EAI_MEMORY); if (*numaddr == ':') { *host = '0'; rb_strlcpy(host+1, numaddr, hostlen-1); } else rb_strlcpy(host, numaddr, hostlen); return(0); } #endif #endif