Added getaddrinfo.[ch] & gethostbyname.[ch] to provide RFC2553 functions

	if missing in system libs and lwres not present
Moved all references to netdb.h and sys/socket.h into common.h.in
Modified automake call in tools/setup to include adding missing files
	so config.sub and config.guess will be available


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@376 f882894a-f735-0410-b71e-b25c423dba1c

11 files changed, 783 insertions, 16 deletions

diff --git a/configure.in b/configure.in
index ef0d06b..7fccb98 100644
--- a/configure.in
+++ b/configure.in
@@ -11,6 +11,7 @@ PACKAGE_RELEASE="${REL}"
 AC_SUBST(PACKAGE_RELEASE)
 AM_INIT_AUTOMAKE(nagios-plugins,${PACKAGE_VERSION})
 AM_CONFIG_HEADER(plugins/config.h plugins/common.h plugins/version.h plugins/netutils.h plugins/utils.h plugins/popen.h)
+AC_CANONICAL_HOST
 
 AC_PREFIX_DEFAULT(/usr/local/nagios)
 
@@ -52,18 +53,38 @@ SUPPORT="Send email to nagios-users@lists.sourceforge.net if you have questions\
 AC_SUBST(SUPPORT)
 
 dnl CGIURL has changed for Nagios with 1.0 beta
-AC_ARG_WITH(cgiurl,--with-cgiurl=<dir> sets URL for cgi programs,cgiurl=$withval,cgiurl=/nagios/cgi-bin)
+dnl AC_ARG_WITH(cgiurl,--with-cgiurl=<dir> sets URL for cgi programs,cgiurl=$withval,cgiurl=/nagios/cgi-bin)
+AC_ARG_WITH(cgiurl,
+        ACX_HELP_STRING([--with-cgiurl=DIR],
+                [sets URL for cgi programs]),
+        cgiurl=$withval,
+        cgiurl=/nagios/cgi-bin)
 CGIURL="$cgiurl"
 AC_DEFINE_UNQUOTED(CGIURL,"$CGIURL",[URL of CGI programs])
 
-AC_ARG_WITH(nagios_user,--with-nagios-user=<user> sets user name to run nagios,nagios_usr=$withval,nagios_usr=nagios)
-AC_ARG_WITH(nagios_group,--with-nagios-group=<group> sets group name to run nagios,nagios_grp=$withval,nagios_grp=nagios)
+dnl AC_ARG_WITH(nagios_user,--with-nagios-user=<user> sets user name to run nagios,nagios_usr=$withval,nagios_usr=nagios)
+AC_ARG_WITH(nagios_user,
+        ACX_HELP_STRING([--with-nagios-user=USER],
+                [set user name to run nagios]),
+        nagios_usr=$withval,
+        nagios_usr=nagios)
+dnl AC_ARG_WITH(nagios_group,--with-nagios-group=<group> sets group name to run nagios,nagios_grp=$withval,nagios_grp=nagios)
+AC_ARG_WITH(nagios_group,
+        ACX_HELP_STRING([--with-nagios-group=GROUP],
+                [set group name to run nagios]),
+        nagios_grp=$withval,
+        nagios_grp=nagios)
 AC_SUBST(nagios_usr)
 AC_SUBST(nagios_grp)
 INSTALL_OPTS="-o $nagios_usr -g $nagios_grp"
 AC_SUBST(INSTALL_OPTS)
 
-AC_ARG_WITH(trusted_path,--with-trusted-path=/bin:/sbin:/usr/bin:/usr/sbin sets trusted path for executables called by scripts,trusted_path=$withval,trusted_path=/bin:/sbin:/usr/bin:/usr/sbin)
+dnl AC_ARG_WITH(trusted_path,--with-trusted-path=/bin:/sbin:/usr/bin:/usr/sbin sets trusted path for executables called by scripts,trusted_path=$withval,trusted_path=/bin:/sbin:/usr/bin:/usr/sbin)
+AC_ARG_WITH(trusted_path,
+        ACX_HELP_STRING([--with-trusted-path=PATH],
+                [sets trusted path for executables called by scripts (default=/bin:/sbin:/usr/bin:/usr/sbin)]),
+        trusted_path=$withval,
+        trusted_path=/bin:/sbin:/usr/bin:/usr/sbin)
 AC_SUBST(trusted_path)
 
 EXTRAS=
@@ -84,6 +105,18 @@ AC_PATH_PROG(SH,sh)
 AC_PATH_PROG(HOSTNAME,hostname)
 AC_PATH_PROG(BASENAME,basename)
 
+dnl
+dnl Check for miscellaneous stuff
+dnl 
+
+case $host_vender-$host_os in
+sun*)
+        AC_DEFINE(__EXTENSIONS__,1,[Sun's netdb.h needs this for getaddrinfo])
+        ;;
+osf*)
+        AC_DEFINE(_OSF_SOURCE,1,[OSF needs this for getaddrinfo])
+        ;;
+esac
 
 dnl
 dnl Checks for libraries.
@@ -98,7 +131,11 @@ AC_SUBST(SOCKETLIBS)
 dnl Check for PostgreSQL libraries
 _SAVEDLIBS="$LIBS"
 _SAVEDCPPFLAGS="$CPPFLAGS"
-AC_ARG_WITH(pgsql,--with-pgsql=<dir> sets path to pgsql installation,[PGSQL=$withval])
+dnl AC_ARG_WITH(pgsql,--with-pgsql=<dir> sets path to pgsql installation,[PGSQL=$withval])
+AC_ARG_WITH(pgsql,
+        ACX_HELP_STRING([--with-pgsql=DIR],
+                [sets path to pgsql installation]),
+        PGSQL=$withval,)
 AC_CHECK_LIB(crypt,main)
 if test "$ac_cv_lib_crypt_main" = "yes"; then
   if test -n "$PGSQL"; then
@@ -175,7 +212,11 @@ LIBS="$_SAVEDLIBS"
 dnl Check for mysql libraries
 _SAVEDLIBS="$LIBS"
 _SAVEDCPPFLAGS="$CPPFLAGS"
-AC_ARG_WITH(mysql,--with-mysql=<dir> sets path to mysql installation (assumes lib/mysql and include subdirs),[MYSQL=$withval])
+dnl AC_ARG_WITH(mysql,--with-mysql=<dir> sets path to mysql installation (assumes lib/mysql and include subdirs),[MYSQL=$withval])
+AC_ARG_WITH(mysql,
+        ACX_HELP_STRING([--with-mysql=DIR],
+                [sets path to mysql installation (assumes lib/mysql and include subdirs]),
+        MYSQL=$withval,)
 if test -n "$MYSQL"; then
   MYSQLLIBDIR=$MYSQL/lib/mysql
   CPPFLAGS="-I$MYSQL/include"
@@ -229,7 +270,11 @@ elif test "$OPENSSL" = "/usr/local/bin/openssl"; then
 elif test "$OPENSSL" = "/usr/local/ssl/bin/openssl"; then
   OPENSSL=/usr/local/ssl
 fi
-AC_ARG_WITH(openssl,--with-openssl=<dir> sets path to openssl installation,[OPENSSL=$withval])
+dnl AC_ARG_WITH(openssl,--with-openssl=<dir> sets path to openssl installation,[OPENSSL=$withval])
+AC_ARG_WITH(openssl,
+        ACX_HELP_STRING([--with-openssl=DIR],
+                [sets path to openssl installation]),
+        OPENSSL=$withval,)
 
 dnl #########################################################################
 dnl Check if Posix getaddrinfo() is available.  It is also possible to use
@@ -785,7 +830,11 @@ else
         echo "** Unable to find usable ps syntax"
 fi
 
-AC_ARG_WITH(df_command,--with-df-command=<syntax> sets syntax for df,DF_COMMAND=$withval)
+dnl AC_ARG_WITH(df_command,--with-df-command=<syntax>,sets syntax for df,DF_COMMAND=$withval)
+AC_ARG_WITH(df_command,
+        ACX_HELP_STRING([--with-df-command=SYNTAX],
+                [sets syntax for df]),
+        DF_COMMAND=$withval,)
 if test -n "$DF_COMMAND"
 then
         AC_DEFINE_UNQUOTED(DF_COMMAND,"$DF_COMMAND",[path and args for df command])
@@ -815,7 +864,11 @@ fi
 
 AC_PATH_PROG(PATH_TO_PING,ping)
 
-AC_ARG_WITH(ping_command,--with-ping-command=<syntax> sets syntax for ping,PING_COMMAND=$withval)
+dnl AC_ARG_WITH(ping_command,--with-ping-command=<syntax> sets syntax for ping,PING_COMMAND=$withval)
+AC_ARG_WITH(ping_command,
+        ACX_HELP_STRING([--with-ping-command=SYNTAX],
+                [sets syntax for ping]),
+        PING_COMMAND=$withval,)
 if test -n "$PING_COMMAND"
 then
         echo "      ping syntax... (command-line) $PING_COMMAND"
diff --git a/lib/Makefile.am b/lib/Makefile.am
index d82f138..7826a28 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -2,9 +2,10 @@
 
 noinst_LIBRARIES = libnagiosplug.a
 
-noinst_HEADERS = getopt.h
+noinst_HEADERS = getopt.h getaddrinfo.h gethostbyname.h
 
 libnagiosplug_a_SOURCES = getopt.c getopt1.c getloadavg.c
 
 INCLUDES = -I$(srcdir)
 
+EXTRA_DIST = getaddrinfo.c gethostbyname.c
diff --git a/lib/getaddrinfo.c b/lib/getaddrinfo.c
new file mode 100644
index 0000000..c958da6
--- /dev/null
+++ b/lib/getaddrinfo.c
@@ -0,0 +1,312 @@
+/*
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/* An emulation of the RFC 2553 / Posix getaddrinfo resolver interface.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+/* Need to turn off Posix features in glibc to build this */
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <netdb.h>
+
+#include "gethostbyname.h"
+#include "getaddrinfo.h"
+
+static struct addrinfo *
+dup_addrinfo (struct addrinfo *info, void *addr, size_t addrlen)
+{
+  struct addrinfo *ret;
+
+  ret = malloc (sizeof (struct addrinfo));
+  if (ret == NULL)
+    return NULL;
+  memcpy (ret, info, sizeof (struct addrinfo));
+  ret->ai_addr = malloc (addrlen);
+  if (ret->ai_addr == NULL)
+    {
+      free (ret);
+      return NULL;
+    }
+  memcpy (ret->ai_addr, addr, addrlen);
+  ret->ai_addrlen = addrlen;
+  return ret;
+}
+
+int
+getaddrinfo (const char *nodename, const char *servname,
+             const struct addrinfo *hints, struct addrinfo **res)
+{
+  struct hostent *hp;
+  struct servent *servent;
+  const char *socktype;
+  int port;
+  struct addrinfo hint, result;
+  struct addrinfo *ai, *sai, *eai;
+  struct ghbnctx ghbnctx;
+  char **addrs;
+  int code;
+
+  memset (&result, 0, sizeof result);
+
+  /* default for hints */
+  if (hints == NULL)
+    {
+      memset (&hint, 0, sizeof hint);
+      hint.ai_family = PF_UNSPEC;
+      hints = &hint;
+    }
+
+  /* servname must not be NULL in this implementation */
+  if (servname == NULL)
+    return EAI_NONAME;
+
+  /* check for tcp or udp sockets only */
+  if (hints->ai_socktype == SOCK_STREAM)
+    socktype = "tcp";
+  else if (hints->ai_socktype == SOCK_DGRAM)
+    socktype = "udp";
+  else
+    return EAI_SERVICE;
+  result.ai_socktype = hints->ai_socktype;
+
+  /* Note: maintain port in host byte order to make debugging easier */
+  if (isdigit (*servname))
+    port = strtol (servname, NULL, 10);
+  else if ((servent = getservbyname (servname, socktype)) != NULL)
+    port = ntohs (servent->s_port);
+  else
+    return EAI_NONAME;
+
+  /* if nodename == NULL refer to the local host for a client or any
+     for a server */
+  if (nodename == NULL)
+    {
+      struct sockaddr_in sin;
+
+      /* check protocol family is PF_UNSPEC or PF_INET - could try harder
+         for IPv6 but that's more code than I'm prepared to write */
+      if (hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET)
+        result.ai_family = AF_INET;
+      else
+        return EAI_FAMILY;
+
+      sin.sin_family = result.ai_family;
+      sin.sin_port = htons (port);
+      if (hints->ai_flags & AI_PASSIVE)
+        sin.sin_addr.s_addr = htonl (INADDR_ANY);
+      else
+        sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+      /* Duplicate result and addr and return */
+      *res = dup_addrinfo (&result, &sin, sizeof sin);
+      return (*res == NULL) ? EAI_MEMORY : 0;
+    }
+
+  /* If AI_NUMERIC is specified, use inet_addr to translate numbers and
+     dots notation. */
+  if (hints->ai_flags & AI_NUMERICHOST)
+    {
+      struct sockaddr_in sin;
+
+      /* check protocol family is PF_UNSPEC or PF_INET */
+      if (hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET)
+        result.ai_family = AF_INET;
+      else
+        return EAI_FAMILY;
+
+      sin.sin_family = result.ai_family;
+      sin.sin_port = htons (port);
+      sin.sin_addr.s_addr = inet_addr (nodename);
+      /* Duplicate result and addr and return */
+      *res = dup_addrinfo (&result, &sin, sizeof sin);
+      return (*res == NULL) ? EAI_MEMORY : 0;
+    }
+
+  errno = 0;
+  hp = gethostbyname_ctx (nodename, &ghbnctx);
+  if (hp == NULL)
+    {
+      if (errno != 0)
+        {
+          free_ghbnctx (&ghbnctx);
+          return EAI_SYSTEM;
+        }
+      code = h_error_ctx (&ghbnctx);
+      switch (code)
+        {
+        case HOST_NOT_FOUND: code = EAI_NODATA; break;
+        case NO_DATA: code = EAI_NODATA; break;
+#if defined(NO_ADDRESS) && NO_ADDRESS != NO_DATA
+        case NO_ADDRESS: code = EAI_NODATA; break;
+#endif
+        case NO_RECOVERY: code = EAI_FAIL; break;
+        case TRY_AGAIN: code = EAI_AGAIN; break;
+        default: code = EAI_FAIL; break;
+        }
+      free_ghbnctx (&ghbnctx);
+      return code;
+    }
+
+  /* Check that the address family is acceptable.
+   */
+  switch (hp->h_addrtype)
+    {
+    case AF_INET:
+      if (!(hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET))
+        goto eai_family;
+      break;
+#ifdef USE_IPV6
+    case AF_INET6:
+      if (!(hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET6))
+        goto eai_family;
+      break;
+#endif
+    default:
+    eai_family:
+      free_ghbnctx (&ghbnctx);
+      return EAI_FAMILY;
+    }
+
+  /* For each element pointed to by hp, create an element in the
+     result linked list. */
+  sai = eai = NULL;
+  for (addrs = hp->h_addr_list; *addrs != NULL; addrs++)
+    {
+      struct sockaddr sa;
+      size_t addrlen;
+
+      sa.sa_family = hp->h_addrtype;
+      switch (hp->h_addrtype)
+        {
+        case AF_INET:
+          ((struct sockaddr_in *) &sa)->sin_port = htons (port);
+          memcpy (&((struct sockaddr_in *) &sa)->sin_addr,
+                  *addrs, hp->h_length);
+          addrlen = sizeof (struct sockaddr_in);
+          break;
+#ifdef USE_IPV6
+        case AF_INET6:
+# if SIN6_LEN
+          ((struct sockaddr_in6 *) &sa)->sin6_len = hp->h_length;
+# endif
+          ((struct sockaddr_in6 *) &sa)->sin6_port = htons (port);
+          memcpy (&((struct sockaddr_in6 *) &sa)->sin6_addr,
+                  *addrs, hp->h_length);
+          addrlen = sizeof (struct sockaddr_in6);
+          break;
+#endif
+        default:
+          continue;
+        }
+
+      result.ai_family = hp->h_addrtype;
+      ai = dup_addrinfo (&result, &sa, addrlen);
+      if (ai == NULL)
+        {
+          free_ghbnctx (&ghbnctx);
+          freeaddrinfo (sai);
+          return EAI_MEMORY;
+        }
+      if (sai == NULL)
+        sai = ai;
+      else
+        eai->ai_next = ai;
+      eai = ai;
+    }
+
+  if (sai == NULL)
+    {
+      free_ghbnctx (&ghbnctx);
+      return EAI_NODATA;
+    }
+  
+  if (hints->ai_flags & AI_CANONNAME) 
+    {
+      sai->ai_canonname = malloc (strlen (hp->h_name) + 1);
+      if (sai->ai_canonname == NULL)
+        {
+          free_ghbnctx (&ghbnctx);
+          freeaddrinfo (sai);
+          return EAI_MEMORY;
+        }
+      strcpy (sai->ai_canonname, hp->h_name);
+    }
+
+  free_ghbnctx (&ghbnctx);
+  *res = sai;
+  return 0;
+}
+
+void
+freeaddrinfo (struct addrinfo *ai)
+{
+  struct addrinfo *next;
+
+  while (ai != NULL)
+    {
+      next = ai->ai_next;
+      if (ai->ai_canonname != NULL)
+        free (ai->ai_canonname);
+      if (ai->ai_addr != NULL)
+        free (ai->ai_addr);
+      free (ai);
+      ai = next;
+    }
+}
+
+const char *
+gai_strerror (int ecode)
+{
+  static const char *eai_descr[] =
+    {
+      "no error",
+      "address family for nodename not supported",      /* EAI_ADDRFAMILY */
+      "temporary failure in name resolution",           /* EAI_AGAIN */
+      "invalid value for ai_flags",                     /* EAI_BADFLAGS */
+      "non-recoverable failure in name resolution",     /* EAI_FAIL */
+      "ai_family not supported",                        /* EAI_FAMILY */
+      "memory allocation failure",                      /* EAI_MEMORY */
+      "no address associated with nodename",            /* EAI_NODATA */
+      "nodename nor servname provided, or not known",   /* EAI_NONAME */
+      "servname not supported for ai_socktype",         /* EAI_SERVICE */
+      "ai_socktype not supported",                      /* EAI_SOCKTYPE */
+      "system error returned in errno",                 /* EAI_SYSTEM */
+    };
+
+  if (ecode < 0 || ecode > (int) (sizeof eai_descr/ sizeof eai_descr[0]))
+    return "unknown error";
+  return eai_descr[ecode];
+}
+
diff --git a/lib/getaddrinfo.h b/lib/getaddrinfo.h
new file mode 100644
index 0000000..c474d3b
--- /dev/null
+++ b/lib/getaddrinfo.h
@@ -0,0 +1,67 @@
+#ifndef _getaddrinfo_h
+#define _getaddrinfo_h
+/*
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/* Structure and prototypes aken from RFC 2553 */
+
+struct addrinfo
+  {
+    int ai_flags;               /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
+    int ai_family;              /* PF_xxx */
+    int ai_socktype;            /* SOCK_xxx */
+    int ai_protocol;            /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
+    size_t ai_addrlen;          /* length of ai_addr */
+    char *ai_canonname;         /* canonical name for nodename */
+    struct sockaddr *ai_addr;   /* binary address */
+    struct addrinfo *ai_next;   /* next structure in linked list */
+  };
+
+/* Supposed to be defined in <netdb.h> */
+#define AI_PASSIVE     1       /* Socket address is intended for `bind'.  */
+#define AI_CANONNAME   2       /* Request for canonical name.  */
+#define AI_NUMERICHOST 4       /* Don't use name resolution.  */
+
+/* Supposed to be defined in <netdb.h> */
+#define EAI_ADDRFAMILY 1   /* address family for nodename not supported */
+#define EAI_AGAIN      2   /* temporary failure in name resolution */
+#define EAI_BADFLAGS   3   /* invalid value for ai_flags */
+#define EAI_FAIL       4   /* non-recoverable failure in name resolution */
+#define EAI_FAMILY     5   /* ai_family not supported */
+#define EAI_MEMORY     6   /* memory allocation failure */
+#define EAI_NODATA     7   /* no address associated with nodename */
+#define EAI_NONAME     8   /* nodename nor servname provided, or not known */
+#define EAI_SERVICE    9   /* servname not supported for ai_socktype */
+#define EAI_SOCKTYPE   10  /* ai_socktype not supported */
+#define EAI_SYSTEM     11  /* system error returned in errno */
+
+/* RFC 2553 / Posix resolver */
+int getaddrinfo (const char *nodename, const char *servname,
+                 const struct addrinfo *hints, struct addrinfo **res);
+
+/* Free addrinfo structure and associated storage */
+void freeaddrinfo (struct addrinfo *ai);
+
+/* Convert error return from getaddrinfo() to string */
+const char *gai_strerror (int code);
+
+#endif
diff --git a/lib/gethostbyname.c b/lib/gethostbyname.c
new file mode 100644
index 0000000..d151606
--- /dev/null
+++ b/lib/gethostbyname.c
@@ -0,0 +1,228 @@
+/*
+ *  This file is a ghastly hack because nobody can agree on
+ *  gethostbyname_r()'s prototype.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _SVID_SOURCE    1       /* Need this to get gethostbyname_r() */
+
+#include <assert.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include "gethostbyname.h"
+
+#if HAVE_GETIPNODEBYNAME
+
+void
+free_ghbnctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  if (ctx->hostent != NULL)
+    freehostent (ctx->hostent);
+}
+
+struct hostent *
+gethostbyname_ctx (const char *host, struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  memset (ctx, 0, sizeof (struct ghbnctx));
+  ctx->hostent = getipnodebyname (host, AF_UNSPEC, AI_ADDRCONFIG, &ctx->h_err);
+  return ctx->hostent;
+}
+
+int
+h_error_ctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  return ctx->h_err;
+}
+
+#elif HAVE_GETHOSTBYNAME_R == 6
+
+void
+free_ghbnctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  if (ctx->hostbuf != NULL)
+    free (ctx->hostbuf);
+}
+
+struct hostent *
+gethostbyname_ctx (const char *host, struct ghbnctx *ctx)
+{
+  struct hostent *hp;
+  char *tmp;
+  int err;
+
+  assert (ctx != NULL);
+
+  memset (ctx, 0, sizeof (struct ghbnctx));
+  ctx->hostbuf_len = 2048;
+  if ((ctx->hostbuf = malloc (ctx->hostbuf_len)) == NULL)
+    {
+      errno = ENOMEM;
+      return NULL;
+    }
+  while ((err = gethostbyname_r (host,
+                                 &ctx->hostent, ctx->hostbuf, ctx->hostbuf_len,
+                                 &hp, &ctx->h_err)) == ERANGE)
+    {
+      ctx->hostbuf_len += 1024;
+      if ((tmp = realloc (ctx->hostbuf, ctx->hostbuf_len)) == NULL)
+        {
+          errno = ENOMEM;
+          return NULL;
+        }
+      ctx->hostbuf = tmp;
+    }
+  if (err != 0)
+    {
+      errno = err;
+      return NULL;
+    }
+  return hp;
+}
+
+int
+h_error_ctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  return ctx->h_err;
+}
+
+#elif HAVE_GETHOSTBYNAME_R == 5
+
+void
+free_ghbnctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  if (ctx->hostbuf != NULL)
+    free (ctx->hostbuf);
+}
+
+struct hostent *
+gethostbyname_ctx (const char *host, struct ghbnctx *ctx)
+{
+  struct hostent *hp;
+  char *tmp;
+
+  assert (ctx != NULL);
+
+  memset (ctx, 0, sizeof (struct ghbnctx));
+  ctx->hostbuf_len = 2048;
+  if ((ctx->hostbuf = malloc (ctx->hostbuf_len)) == NULL)
+    {
+      errno = ENOMEM;
+      return NULL;
+    }
+  while ((hp = gethostbyname_r (host, &ctx->hostent,
+                                ctx->hostbuf, ctx->hostbuf_len,
+                                &ctx->h_err)) == NULL && errno == ERANGE)
+    {
+      ctx->hostbuf_len += 1024;
+      if ((tmp = realloc (ctx->hostbuf, ctx->hostbuf_len)) == NULL)
+        {
+          errno = ENOMEM;
+          return NULL;
+        }
+      ctx->hostbuf = tmp;
+    }
+  return hp;
+}
+
+int
+h_error_ctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  return ctx->h_err;
+}
+
+#elif HAVE_GETHOSTBYNAME_R == 3
+
+void
+free_ghbnctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  /* FIXME: does this need to do anything? */
+}
+
+struct hostent *
+gethostbyname_ctx (const char *host, struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  if (!gethostbyname_r (host, &ctx->hostent, &ctx->hostent_data))
+    {
+      ctx->h_err = h_errno;     /* FIXME: is this correct? */
+      return NULL;
+    }
+  return &ctx->hostent;
+}
+  
+int
+h_error_ctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  return ctx->h_err;
+}
+
+#else
+
+void
+free_ghbnctx (struct ghbnctx *ctx __attribute__ ((unused)))
+{
+  assert (ctx != NULL);
+}
+
+struct hostent *
+gethostbyname_ctx (const char *host, struct ghbnctx *ctx)
+{
+  struct hostent *hp;
+
+  hp = gethostbyname (host);
+  if (hp == NULL)
+    ctx->h_err = h_errno;
+  return hp;
+}
+
+int
+h_error_ctx (struct ghbnctx *ctx)
+{
+  assert (ctx != NULL);
+
+  return ctx->h_err;
+}
+
+#endif
diff --git a/lib/gethostbyname.h b/lib/gethostbyname.h
new file mode 100644
index 0000000..2b96399
--- /dev/null
+++ b/lib/gethostbyname.h
@@ -0,0 +1,103 @@
+/*
+ *  This file is a ghastly hack because nobody can agree on
+ *  gethostbyname_r()'s prototype.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*************************************************************************
+   Usage:
+
+   #include <errno.h>
+   #include "gethostbyname.h"
+
+   f ()
+   {
+     struct ghbnctx ctx;
+
+     errno = 0;
+     hp = gethostbyname_ctx (host, &ctx);
+     if (hp == NULL)
+       {
+         if (errno != 0)
+           handle_value_of_errno (errno);
+         else
+           handle_value_of_h_errno (h_error_ctx (&ctx));
+       }
+     else
+       {
+         ...
+       }
+     free_ghbnctx (&ctx);
+   }
+ *************************************************************************/
+
+#ifndef _gethostbyname_h
+#define _gethostbyname_h
+
+#if HAVE_GETIPNODEBYNAME
+
+struct ghbnctx
+  {
+    int h_err;
+    struct hostent *hostent;
+  };
+
+#elif HAVE_GETHOSTBYNAME_R == 6
+
+struct ghbnctx
+  {
+    int h_err;
+    struct hostent hostent;
+    char *hostbuf;
+    size_t hostbuf_len;
+  };
+
+#elif HAVE_GETHOSTBYNAME_R == 5
+
+struct ghbnctx
+  {
+    int h_err;
+    struct hostent hostent;
+    char *hostbuf;
+    int hostbuf_len;
+  };
+
+#elif HAVE_GETHOSTBYNAME_R == 3
+
+struct ghbnctx
+  {
+    int h_err;
+    struct hostent_data hostent_data;
+    struct hostent hostent;
+  };
+
+#else
+
+struct ghbnctx
+  {
+    int h_err;
+  };
+
+#endif
+
+struct hostent *gethostbyname_ctx (const char *host, struct ghbnctx *ctx);
+int h_error_ctx (struct ghbnctx *ctx);
+void free_ghbnctx (struct ghbnctx *ctx);
+
+#endif
+
diff --git a/plugins/check_pgsql.c b/plugins/check_pgsql.c
index f8419dc..2033b8c 100644
--- a/plugins/check_pgsql.c
+++ b/plugins/check_pgsql.c
@@ -79,7 +79,6 @@ enum {
 #include "config.h"
 #include "common.h"
 #include "utils.h"
-#include <netdb.h>
 #include <libpq-fe.h>
 
 int process_arguments (int, char **);
diff --git a/plugins/common.h.in b/plugins/common.h.in
index 48e7f6f..09df00d 100644
--- a/plugins/common.h.in
+++ b/plugins/common.h.in
@@ -72,6 +72,13 @@
 
 #include <ctype.h>
 
+#if HAVE_LWRES_NETDB_H
+#include <lwres/netdb.h>
+#elif !HAVE_GETADDRINFO
+#include "getaddrinfo.h"
+#else
+#include <netdb.h>
+#endif
 
 /*
  *
diff --git a/plugins/netutils.c b/plugins/netutils.c
index e5d3528..fc85a24 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -31,10 +31,8 @@
 
 #include "config.h"
 #include "common.h"
-#include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <netdb.h>
 
 extern int socket_timeout;
 RETSIGTYPE socket_timeout_alarm_handler (int);
diff --git a/plugins/netutils.h.in b/plugins/netutils.h.in
index be4ae24..1907ab7 100644
--- a/plugins/netutils.h.in
+++ b/plugins/netutils.h.in
@@ -34,10 +34,9 @@
 #undef HAVE_STRINGS_H
 #undef HAVE_STRING_H
 
-#include <sys/socket.h>
+#include "common.h"
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <netdb.h>
 
 void socket_timeout_alarm_handler (int);
 
diff --git a/tools/setup b/tools/setup
index 18281a3..b825a6b 100755
--- a/tools/setup
+++ b/tools/setup
@@ -3,7 +3,7 @@
 aclocal -I lib
 autoconf
 autoheader
-automake
+automake --add-missing --copy
 
 if [ -f debian/rules ] ; then
   chmod +x debian/rules