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-rw-r--r--lib/getaddrinfo.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/lib/getaddrinfo.c b/lib/getaddrinfo.c
new file mode 100644
index 0000000..cc718bc
--- /dev/null
+++ b/lib/getaddrinfo.c
@@ -0,0 +1,418 @@
+/* Get address information (partial implementation).
+ Copyright (C) 1997, 2001, 2002, 2004, 2005, 2006, 2007 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. */
+
+#include <config.h>
+
+#include "getaddrinfo.h"
+
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+
+/* Get calloc. */
+#include <stdlib.h>
+
+/* Get memcpy, strdup. */
+#include <string.h>
+
+/* Get snprintf. */
+#include <stdio.h>
+
+#include <stdbool.h>
+
+#include "gettext.h"
+#define _(String) gettext (String)
+#define N_(String) String
+
+#include "inet_ntop.h"
+
+/* BeOS has AF_INET, but not PF_INET. */
+#ifndef PF_INET
+# define PF_INET AF_INET
+#endif
+/* BeOS also lacks PF_UNSPEC. */
+#ifndef PF_UNSPEC
+# define PF_UNSPEC 0
+#endif
+
+#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 = (hints->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
+ {
+ unsigned short int port
+ = ntohs (((const struct sockaddr_in *) sa)->sin_port);
+ if (servicelen <= snprintf (service, servicelen, "%u", port))
+ return EAI_OVERFLOW;
+ }
+ break;
+ }
+
+ return 0;
+}
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