New file, from gnulib.

1 files changed, 210 insertions, 0 deletions

diff --git a/lib/getaddrinfo.c b/lib/getaddrinfo.c
new file mode 100644
index 000000000..594b76494
--- /dev/null
+++ b/lib/getaddrinfo.c
@@ -0,0 +1,210 @@
+/* Get address information (partial implementation).
+   Copyright (C) 1997, 2001, 2002, 2004, 2005 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"
+
+/* 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 "strdup.h"
+
+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;
+  struct servent *se;
+  struct hostent *he;
+  size_t sinlen;
+
+  if (hints && (hints->ai_flags & ~AI_CANONNAME))
+    /* 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)
+    /* FIXME: Support server bind mode. */
+    return EAI_NONAME;
+
+  if (servname)
+    {
+      const char *proto =
+	(hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp";
+
+      /* FIXME: Use getservbyname_r if available. */
+      se = getservbyname (servname, proto);
+
+      if (!se)
+	return EAI_SERVICE;
+    }
+
+  /* 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:
+      sinlen = sizeof (struct sockaddr_in6);
+      break;
+#endif
+
+#if HAVE_IPV4
+    case PF_INET:
+      sinlen = sizeof (struct sockaddr_in);
+      break;
+#endif
+
+    default:
+      return EAI_NODATA;
+    }
+
+  tmp = calloc (1, sizeof (*tmp) + sinlen);
+  if (!tmp)
+    return EAI_MEMORY;
+
+  switch (he->h_addrtype)
+    {
+#if HAVE_IPV6
+    case PF_INET6:
+      {
+	struct sockaddr_in6 *sinp = (char *) tmp + sizeof (*tmp);
+
+	if (se)
+	  sinp->sin6_port = se->s_port;
+
+	if (he->h_length != sizeof (sinp->sin6_addr))
+	  return EAI_SYSTEM; /* FIXME: Better return code?  Set errno? */
+
+	memcpy (&sinp->sin6_addr, he->h_addr_list[0], he->h_length);
+
+	tmp->ai_addr = (struct sockaddr *) sinp;
+	tmp->ai_addrlen = sinlen;
+      }
+      break;
+#endif
+
+#if HAVE_IPV4
+    case PF_INET:
+      {
+	struct sockaddr_in *sinp = (char *) tmp + sizeof (*tmp);
+
+	if (se)
+	  sinp->sin_port = se->s_port;
+
+	if (he->h_length != sizeof (sinp->sin_addr))
+	  return EAI_SYSTEM; /* FIXME: Better return code?  Set errno? */
+
+	memcpy (&sinp->sin_addr, he->h_addr_list[0], he->h_length);
+
+	tmp->ai_addr = (struct sockaddr *) sinp;
+	tmp->ai_addrlen = sinlen;
+      }
+      break;
+#endif
+
+    default:
+      free (tmp);
+      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 (tmp);
+	  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;
+
+  /* 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)
+{
+  while (ai)
+    {
+      struct addrinfo *cur;
+
+      cur = ai;
+      ai = ai->ai_next;
+
+      if (cur->ai_canonname) free (cur->ai_canonname);
+      free (cur);
+    }
+}