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kc3-lang/gnulib/lib/getaddrinfo.c
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Simon Josefsson
- lib/getaddrinfo.c
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/* Get address information (partial implementation). Copyright (C) 1997, 2001, 2002, 2004, 2005, 2006 Free Software Foundation, Inc. Contributed by Simon Josefsson <simon@josefsson.org>. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include "getaddrinfo.h" #if HAVE_NETINET_IN_H # include <netinet/in.h> #endif /* Get calloc. */ #include <stdlib.h> /* Get memcpy. */ #include <string.h> #include <stdbool.h> #include "gettext.h" #define _(String) gettext (String) #define N_(String) String #include "inet_ntop.h" #include "snprintf.h" #include "strdup.h" #if defined _WIN32 || defined __WIN32__ # define WIN32_NATIVE #endif #ifdef WIN32_NATIVE typedef int (WSAAPI *getaddrinfo_func) (const char*, const char*, const struct addrinfo*, struct addrinfo**); typedef void (WSAAPI *freeaddrinfo_func) (struct addrinfo*); typedef int (WSAAPI *getnameinfo_func) (const struct sockaddr*, socklen_t, char*, DWORD, char*, DWORD, int); static getaddrinfo_func getaddrinfo_ptr = NULL; static freeaddrinfo_func freeaddrinfo_ptr = NULL; static getnameinfo_func getnameinfo_ptr = NULL; static int use_win32_p (void) { static int done = 0; HMODULE h; if (done) return getaddrinfo_ptr ? 1 : 0; done = 1; h = GetModuleHandle ("ws2_32.dll"); if (h) { getaddrinfo_ptr = (getaddrinfo_func) GetProcAddress (h, "getaddrinfo"); freeaddrinfo_ptr = (freeaddrinfo_func) GetProcAddress (h, "freeaddrinfo"); getnameinfo_ptr = (getnameinfo_func) GetProcAddress (h, "getnameinfo"); } /* If either is missing, something is odd. */ if (!getaddrinfo_ptr || !freeaddrinfo_ptr || !getnameinfo_ptr) { getaddrinfo_ptr = NULL; freeaddrinfo_ptr = NULL; getnameinfo_ptr = NULL; return 0; } return 1; } #endif static inline bool validate_family (int family) { /* FIXME: Support more families. */ #if HAVE_IPV4 if (family == PF_INET) return true; #endif #if HAVE_IPV6 if (family == PF_INET6) return true; #endif if (family == PF_UNSPEC) return true; return false; } /* Translate name of a service location and/or a service name to set of socket addresses. */ int getaddrinfo (const char *restrict nodename, const char *restrict servname, const struct addrinfo *restrict hints, struct addrinfo **restrict res) { struct addrinfo *tmp; int port = 0; struct hostent *he; void *storage; size_t size; #if HAVE_IPV6 struct v6_pair { struct addrinfo addrinfo; struct sockaddr_in6 sockaddr_in6; }; #endif #if HAVE_IPV4 struct v4_pair { struct addrinfo addrinfo; struct sockaddr_in sockaddr_in; }; #endif #ifdef WIN32_NATIVE if (use_win32_p ()) return getaddrinfo_ptr (nodename, servname, hints, res); #endif if (hints && (hints->ai_flags & ~(AI_CANONNAME|AI_PASSIVE))) /* FIXME: Support more flags. */ return EAI_BADFLAGS; if (hints && !validate_family (hints->ai_family)) return EAI_FAMILY; if (hints && hints->ai_socktype != SOCK_STREAM && hints->ai_socktype != SOCK_DGRAM) /* FIXME: Support other socktype. */ return EAI_SOCKTYPE; /* FIXME: Better return code? */ if (!nodename) { if (!(hints->ai_flags & AI_PASSIVE)) return EAI_NONAME; #ifdef HAVE_IPV6 nodename = (hint->ai_family == AF_INET6) ? "::" : "0.0.0.0"; #else nodename = "0.0.0.0"; #endif } if (servname) { struct servent *se = NULL; const char *proto = (hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp"; if (!(hints->ai_flags & AI_NUMERICSERV)) /* FIXME: Use getservbyname_r if available. */ se = getservbyname (servname, proto); if (!se) { char *c; if (!(*servname >= '0' && *servname <= '9')) return EAI_NONAME; port = strtoul (servname, &c, 10); if (*c || port > 0xffff) return EAI_NONAME; port = htons (port); } else port = se->s_port; } /* FIXME: Use gethostbyname_r if available. */ he = gethostbyname (nodename); if (!he || he->h_addr_list[0] == NULL) return EAI_NONAME; switch (he->h_addrtype) { #if HAVE_IPV6 case PF_INET6: size = sizeof (struct v6_pair); break; #endif #if HAVE_IPV4 case PF_INET: size = sizeof (struct v4_pair); break; #endif default: return EAI_NODATA; } storage = calloc (1, size); if (!storage) return EAI_MEMORY; switch (he->h_addrtype) { #if HAVE_IPV6 case PF_INET6: { struct v6_pair *p = storage; struct sockaddr_in6 *sinp = &p->sockaddr_in6; tmp = &p->addrinfo; if (port) sinp->sin6_port = port; if (he->h_length != sizeof (sinp->sin6_addr)) { free (storage); return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */ } memcpy (&sinp->sin6_addr, he->h_addr_list[0], sizeof sinp->sin6_addr); tmp->ai_addr = (struct sockaddr *) sinp; tmp->ai_addrlen = sizeof *sinp; } break; #endif #if HAVE_IPV4 case PF_INET: { struct v4_pair *p = storage; struct sockaddr_in *sinp = &p->sockaddr_in; tmp = &p->addrinfo; if (port) sinp->sin_port = port; if (he->h_length != sizeof (sinp->sin_addr)) { free (storage); return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */ } memcpy (&sinp->sin_addr, he->h_addr_list[0], sizeof sinp->sin_addr); tmp->ai_addr = (struct sockaddr *) sinp; tmp->ai_addrlen = sizeof *sinp; } break; #endif default: free (storage); return EAI_NODATA; } if (hints && hints->ai_flags & AI_CANONNAME) { const char *cn; if (he->h_name) cn = he->h_name; else cn = nodename; tmp->ai_canonname = strdup (cn); if (!tmp->ai_canonname) { free (storage); return EAI_MEMORY; } } tmp->ai_protocol = (hints) ? hints->ai_protocol : 0; tmp->ai_socktype = (hints) ? hints->ai_socktype : 0; tmp->ai_addr->sa_family = he->h_addrtype; tmp->ai_family = he->h_addrtype; /* FIXME: If more than one address, create linked list of addrinfo's. */ *res = tmp; return 0; } /* Free `addrinfo' structure AI including associated storage. */ void freeaddrinfo (struct addrinfo *ai) { #ifdef WIN32_NATIVE if (use_win32_p ()) { freeaddrinfo_ptr (ai); return; } #endif while (ai) { struct addrinfo *cur; cur = ai; ai = ai->ai_next; if (cur->ai_canonname) free (cur->ai_canonname); free (cur); } } int getnameinfo(const struct sockaddr *restrict sa, socklen_t salen, char *restrict node, socklen_t nodelen, char *restrict service, socklen_t servicelen, int flags) { #ifdef WIN32_NATIVE if (use_win32_p ()) return getnameinfo_ptr (sa, salen, node, nodelen, service, servicelen, flags); #endif /* FIXME: Support other flags. */ if ((node && nodelen > 0 && !(flags & NI_NUMERICHOST)) || (service && servicelen > 0 && !(flags & NI_NUMERICHOST)) || (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV))) return EAI_BADFLAGS; if (sa == NULL || salen < sizeof (sa->sa_family)) return EAI_FAMILY; switch (sa->sa_family) { #if HAVE_IPV4 case AF_INET: if (salen < sizeof (struct sockaddr_in)) return EAI_FAMILY; break; #endif #if HAVE_IPV6 case AF_INET6: if (salen < sizeof (struct sockaddr_in6)) return EAI_FAMILY; break; #endif default: return EAI_FAMILY; } if (node && nodelen > 0 && flags & NI_NUMERICHOST) { switch (sa->sa_family) { #if HAVE_IPV4 case AF_INET: if (!inet_ntop (AF_INET, &(((const struct sockaddr_in *) sa)->sin_addr), node, nodelen)) return EAI_SYSTEM; break; #endif #if HAVE_IPV6 case AF_INET6: if (!inet_ntop (AF_INET6, &(((const struct sockaddr_in6 *) sa)->sin6_addr), node, nodelen)) return EAI_SYSTEM; break; #endif default: return EAI_FAMILY; } } if (service && servicelen > 0 && flags & NI_NUMERICSERV) switch (sa->sa_family) { #if HAVE_IPV4 case AF_INET: #endif #if HAVE_IPV6 case AF_INET6: #endif if (snprintf (service, servicelen, "%d", ntohs (((const struct sockaddr_in *) sa)->sin_port)) + 1 > servicelen) return EAI_OVERFLOW; break; } return 0; }