9 files changed, 810 insertions, 130 deletions

diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 2524e1ac..a884b451 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -14,14 +14,15 @@ EXTRA_PROGRAMS = check_mysql check_radius check_pgsql check_snmp check_hpjd \
         check_swap check_fping check_ldap check_game check_dig \
         check_nagios check_by_ssh check_dns check_nt
 
-check_tcp_programs = check_ftp check_imap check_nntp check_pop
+check_tcp_programs = check_ftp check_imap check_nntp check_pop check_udp2
 
-EXTRA_DIST = t utils.c netutils.c popen.c utils.h netutils.h popen.h common.h 
+EXTRA_DIST = t utils.c netutils.c popen.c utils.h netutils.h popen.h common.h \
+        getaddrinfo.c getaddrinfo.h gethostbyname.c gethostbyname.h
 
 PLUGINHDRS = common.h config.h
 
 BASEOBJS = utils.o ../lib/libnagiosplug.a
-NETOBJS = netutils.o $(BASEOBJS)
+NETOBJS = netutils.o $(BASEOBJS) $(EXTRA_NETOBJS)
 NETLIBS = $(NETOBJS) $(SOCKETLIBS)
 
 TESTS_ENVIRONMENT = perl -I $(top_builddir) -I $(top_srcdir)
@@ -36,27 +37,27 @@ AM_INSTALL_PROGRAM_FLAGS = @INSTALL_OPTS@
 ##############################################################################
 # the actual targets
 
-check_dig_LDADD = $(BASEOBJS) popen.o
+check_dig_LDADD = $(NETLIBS) popen.o 
 check_disk_LDADD = $(BASEOBJS) popen.o
-check_dns_LDADD = $(BASEOBJS) popen.o
+check_dns_LDADD = $(NETLIBS) popen.o
 check_dummy_LDADD = $(BASEOBJS)
-check_fping_LDADD = $(BASEOBJS) popen.o
+check_fping_LDADD = $(NETLIBS) popen.o
 check_game_LDADD = $(BASEOBJS)
 check_http_LDADD = $(NETLIBS) $(SSLLIBS)
-check_hpjd_LDADD = $(BASEOBJS) popen.o
+check_hpjd_LDADD = $(NETLIBS) popen.o
 check_ldap_LDADD = $(NETLIBS) $(LDAPLIBS)
 check_load_LDADD = $(BASEOBJS) popen.o
 check_mrtg_LDADD = $(BASEOBJS)
 check_mrtgtraf_LDADD = $(BASEOBJS)
-check_mysql_LDADD = $(BASEOBJS) $(MYSQLLIBS)
+check_mysql_LDADD = $(NETLIBS) $(MYSQLLIBS)
 check_nagios_LDADD = $(BASEOBJS) popen.o
 check_nt_LDADD = $(NETLIBS) 
 check_nwstat_LDADD = $(NETLIBS)
 check_overcr_LDADD = $(NETLIBS)
-check_pgsql_LDADD = $(BASEOBJS) $(PGLIBS)
-check_ping_LDADD = $(BASEOBJS) popen.o
+check_pgsql_LDADD = $(NETLIBS) $(PGLIBS)
+check_ping_LDADD = $(NETLIBS) popen.o
 check_procs_LDADD = $(BASEOBJS) popen.o
-check_radius_LDADD = $(BASEOBJS) $(RADIUSLIBS)
+check_radius_LDADD = $(NETLIBS) $(RADIUSLIBS)
 check_real_LDADD = $(NETLIBS)
 check_snmp_LDADD = $(BASEOBJS) popen.o
 check_smtp_LDADD = $(NETLIBS)
@@ -68,31 +69,31 @@ check_udp_LDADD = $(NETLIBS)
 check_ups_LDADD = $(NETLIBS)
 check_users_LDADD = $(BASEOBJS) popen.o
 check_vsz_LDADD = $(BASEOBJS) popen.o
-check_by_ssh_LDADD = $(BASEOBJS) popen.o
+check_by_ssh_LDADD = $(NETLIBS) popen.o
 negate_LDADD = $(BASEOBJS) popen.o
 urlize_LDADD = $(BASEOBJS) popen.o
 
-check_dig_DEPENDENCIES = check_dig.c $(BASEOBJS) popen.o $(DEPLIBS)
+check_dig_DEPENDENCIES = check_dig.c $(NETOBJS) popen.o $(DEPLIBS)
 check_disk_DEPENDENCIES = check_disk.c $(BASEOBJS) popen.o $(DEPLIBS)
-check_dns_DEPENDENCIES = check_dns.c $(BASEOBJS) popen.o $(DEPLIBS)
-check_dummy_DEPENDENCIES = check_dummy.c  $(DEPLIBS)
-check_fping_DEPENDENCIES = check_fping.c $(BASEOBJS) popen.o $(DEPLIBS)
+check_dns_DEPENDENCIES = check_dns.c $(NETOBJS) popen.o $(DEPLIBS)
+check_dummy_DEPENDENCIES = check_dummy.c $(DEPLIBS)
+check_fping_DEPENDENCIES = check_fping.c $(NETOBJS) popen.o $(DEPLIBS)
 check_game_DEPENDENCIES = check_game.c  $(DEPLIBS)
 check_http_DEPENDENCIES = check_http.c $(NETOBJS) $(DEPLIBS)
-check_hpjd_DEPENDENCIES = check_hpjd.c $(BASEOBJS) popen.o $(DEPLIBS)
+check_hpjd_DEPENDENCIES = check_hpjd.c $(NETOBJS) popen.o $(DEPLIBS)
 check_ldap_DEPENDENCIES = check_ldap.c $(NETOBJS) $(DEPLIBS)
 check_load_DEPENDENCIES = check_load.c $(BASEOBJS) popen.o $(DEPLIBS)
-check_mrtg_DEPENDENCIES = check_mrtg.c  $(DEPLIBS)
-check_mrtgtraf_DEPENDENCIES = check_mrtgtraf.c  $(DEPLIBS)
-check_mysql_DEPENDENCIES = check_mysql.c  $(DEPLIBS)
+check_mrtg_DEPENDENCIES = check_mrtg.c $(DEPLIBS)
+check_mrtgtraf_DEPENDENCIES = check_mrtgtraf.c $(DEPLIBS)
+check_mysql_DEPENDENCIES = check_mysql.c $(NETOBJS) $(DEPLIBS)
 check_nagios_DEPENDENCIES = check_nagios.c $(BASEOBJS) popen.o $(DEPLIBS)
 check_nt_DEPENDENCIES = check_nt.c $(NETOBJS) $(DEPLIBS)
 check_nwstat_DEPENDENCIES = check_nwstat.c $(NETOBJS) $(DEPLIBS)
 check_overcr_DEPENDENCIES = check_overcr.c $(NETOBJS) $(DEPLIBS)
-check_pgsql_DEPENDENCIES = check_pgsql.c  $(DEPLIBS)
-check_ping_DEPENDENCIES = check_ping.c $(BASEOBJS) popen.o $(DEPLIBS)
+check_pgsql_DEPENDENCIES = check_pgsql.c $(NETOBJS)  $(DEPLIBS)
+check_ping_DEPENDENCIES = check_ping.c $(NETOBJS) popen.o $(DEPLIBS)
 check_procs_DEPENDENCIES = check_procs.c $(BASEOBJS) popen.o $(DEPLIBS)
-check_radius_DEPENDENCIES = check_radius.c  $(DEPLIBS)
+check_radius_DEPENDENCIES = check_radius.c $(NETOBJS)  $(DEPLIBS)
 check_real_DEPENDENCIES = check_real.c $(NETOBJS) $(DEPLIBS)
 check_snmp_DEPENDENCIES = check_snmp.c $(BASEOBJS) popen.o $(DEPLIBS)
 check_smtp_DEPENDENCIES = check_smtp.c $(NETOBJS) $(DEPLIBS)
@@ -104,7 +105,7 @@ check_udp_DEPENDENCIES = check_udp.c $(NETOBJS) $(DEPLIBS)
 check_ups_DEPENDENCIES = check_ups.c $(NETOBJS) $(DEPLIBS)
 check_users_DEPENDENCIES = check_users.c $(BASEOBJS) popen.o $(DEPLIBS)
 check_vsz_DEPENDENCIES = check_vsz.c $(BASEOBJS) popen.o $(DEPLIBS)
-check_by_ssh_DEPENDENCIES = check_by_ssh.c $(BASEOBJS) popen.o $(DEPLIBS)
+check_by_ssh_DEPENDENCIES = check_by_ssh.c $(NETOBJS) popen.o $(DEPLIBS)
 negate_DEPENDENCIES = negate.c $(BASEOBJS) popen.o $(DEPLIBS)
 urlize_DEPENDENCIES = urlize.c $(BASEOBJS) popen.o $(DEPLIBS)
 
@@ -117,6 +118,10 @@ utils.o: utils.c utils.h $(PLUGINHDRS)
 
 netutils.o: netutils.c netutils.h $(PLUGINHDRS)
 
+getaddrinfo.o: getaddrinfo.h $(PLUGINHDRS)
+
+gethostbyname.o: gethostbyname.h $(PLUGINHDRS)
+
 all-local: $(check_tcp_programs)
 
 $(check_tcp_programs): check_tcp
diff --git a/plugins/getaddrinfo.c b/plugins/getaddrinfo.c
new file mode 100644
index 00000000..12ac67d6
--- /dev/null
+++ b/plugins/getaddrinfo.c
@@ -0,0 +1,303 @@
+/*
+ *  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.
+ *  Modified by Jeremy T. Bouse for use in Nagios plugins
+ *
+ *  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;
+    }
+
+  result.ai_socktype = hints->ai_socktype;
+
+  /* Note: maintain port in host byte order to make debugging easier */
+  if (servname != NULL) {
+    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/plugins/getaddrinfo.h b/plugins/getaddrinfo.h
new file mode 100644
index 00000000..5bcc8844
--- /dev/null
+++ b/plugins/getaddrinfo.h
@@ -0,0 +1,68 @@
+#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.
+ *  Modified by Jeremy T. Bouse for use in Nagios plugins
+ *
+ *  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/plugins/gethostbyname.c b/plugins/gethostbyname.c
new file mode 100644
index 00000000..d151606d
--- /dev/null
+++ b/plugins/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/plugins/gethostbyname.h b/plugins/gethostbyname.h
new file mode 100644
index 00000000..2b963997
--- /dev/null
+++ b/plugins/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/netutils.c b/plugins/netutils.c
index c0e82dad..4234c436 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -29,22 +29,9 @@
 *
 ****************************************************************************/
 
-#include "config.h"
-#include "common.h"
-#include <netinet/in.h>
-#include <arpa/inet.h>
+#include "netutils.h"
 
-extern int socket_timeout;
-RETSIGTYPE socket_timeout_alarm_handler (int);
-
-int process_tcp_request2 (char *, int, char *, char *, int);
-int process_tcp_request (char *, int, char *, char *, int);
-int process_udp_request (char *, int, char *, char *, int);
-int process_request (char *, int, int, char *, char *, int);
-
-int my_tcp_connect (char *, int, int *);
-int my_udp_connect (char *, int, int *);
-int my_connect (char *, int, int *, int);
+int socket_timeout = DEFAULT_SOCKET_TIMEOUT; 
 
 /* handles socket timeouts */
 void
@@ -304,3 +291,69 @@ my_connect (char *host_name, int port, int *sd, int proto)
                 return STATE_CRITICAL;
         }
 }
+
+int
+is_host (char *address)
+{
+        if (is_addr (address) || is_hostname (address))
+                return (TRUE);
+
+        return (FALSE);
+}
+
+int
+is_addr (char *address)
+{
+#ifdef USE_IPV6
+        if (is_inet_addr (address) || is_inet6_addr (address))
+#else
+        if (is_inet_addr (address))
+#endif
+                return (TRUE);
+
+        return (FALSE);
+}
+
+int
+resolve_host_or_addr (char *address, int family)
+{
+        struct addrinfo hints;
+        struct addrinfo *res;
+        int retval;
+
+        memset (&hints, 0, sizeof (hints));
+        hints.ai_family = family;
+        retval = getaddrinfo (address, NULL, &hints, &res);
+
+        if (retval != 0)
+                return FALSE;
+        else {
+                freeaddrinfo (res);
+                return TRUE;
+        }
+}
+
+int
+is_inet_addr (char *address)
+{
+        return resolve_host_or_addr (address, AF_INET);
+}
+
+#ifdef USE_IPV6
+int
+is_inet6_addr (char *address)
+{
+        return resolve_host_or_addr (address, AF_INET6);
+}
+#endif
+
+int
+is_hostname (char *s1)
+{
+#ifdef USE_IPV6
+        return resolve_host_or_addr (s1, AF_UNSPEC);
+#else
+        return resolve_host_or_addr (s1, AF_INET);
+#endif
+}
+
diff --git a/plugins/netutils.h b/plugins/netutils.h
index 3ea51663..6c8eed36 100644
--- a/plugins/netutils.h
+++ b/plugins/netutils.h
@@ -43,11 +43,20 @@ int process_tcp_request (char *address, int port, char *sbuffer,
         char *rbuffer, int rsize);
 int process_udp_request (char *address, int port, char *sbuffer,
         char *rbuffer, int rsize);
-int process_request (char *address, int port, char *proto, char *sbuffer,
+int process_request (char *address, int port, int proto, char *sbuffer,
         char *rbuffer, int rsize);
 
 int my_tcp_connect (char *address, int port, int *sd);
 int my_udp_connect (char *address, int port, int *sd);
 int my_connect (char *address, int port, int *sd, int proto);
 
-int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
+int is_host (char *);
+int is_addr (char *);
+int resolve_host_or_addr (char *, int);
+int is_inet_addr (char *);
+#ifdef USE_IPV6
+int is_inet6_addr (char *);
+#endif
+int is_hostname (char *);
+
+extern int socket_timeout;
diff --git a/plugins/utils.c b/plugins/utils.c
index 7361323f..e204e238 100644
--- a/plugins/utils.c
+++ b/plugins/utils.c
@@ -27,15 +27,6 @@ void print_revision (const char *, const char *);
 void terminate (int, const char *fmt, ...);
 RETSIGTYPE timeout_alarm_handler (int);
 
-int is_host (char *);
-int is_addr (char *);
-int resolve_host_or_addr (char *, int);
-int is_inet_addr (char *);
-#ifdef USE_IPV6
-int is_inet6_addr (char *);
-#endif
-int is_hostname (char *);
-
 int is_integer (char *);
 int is_intpos (char *);
 int is_intneg (char *);
@@ -171,78 +162,6 @@ timeout_alarm_handler (int signo)
 }
 
 int
-is_host (char *address)
-{
-        if (is_addr (address) || is_hostname (address))
-                return (TRUE);
-
-        return (FALSE);
-}
-
-int
-is_addr (char *address)
-{
-#ifdef USE_IPV6
-        if (is_inet_addr (address) || is_inet6_addr (address))
-#else
-        if (is_inet_addr (address))
-#endif
-                return (TRUE);
-
-        return (FALSE);
-}
-
-int
-resolve_host_or_addr (char *address, int family)
-{
-        struct addrinfo hints;
-        struct addrinfo *res;
-        int retval;
-
-        memset (&hints, 0, sizeof (hints));
-        hints.ai_family = family;
-        retval = getaddrinfo (address, NULL, &hints, &res);
-
-        if (retval != 0)
-                return FALSE;
-        else {
-                freeaddrinfo (res);
-                return TRUE;
-        }
-}
-
-int
-is_inet_addr (char *address)
-{
-        return resolve_host_or_addr (address, AF_INET);
-}
-
-#ifdef USE_IPV6
-int
-is_inet6_addr (char *address)
-{
-        return resolve_host_or_addr (address, AF_INET6);
-}
-#endif
-
-/* from RFC-1035
- * 
- * The labels must follow the rules for ARPANET host names.  They must
- * start with a letter, end with a letter or digit, and have as interior
- * characters only letters, digits, and hyphen.  There are also some
- * restrictions on the length.  Labels must be 63 characters or less. */
-
-int
-is_hostname (char *s1)
-{
-#ifdef USE_IPV6
-        return resolve_host_or_addr (s1, AF_UNSPEC);
-#else
-        return resolve_host_or_addr (s1, AF_INET);
-#endif
-}
-
-int
 is_numeric (char *number)
 {
         char tmp[1];
diff --git a/plugins/utils.h b/plugins/utils.h
index 89ada6f0..43b612c1 100644
--- a/plugins/utils.h
+++ b/plugins/utils.h
@@ -27,14 +27,6 @@ int timeout_interval = DEFAULT_SOCKET_TIMEOUT;
 
 /* Test input types */
 
-int is_host (char *);
-int is_addr (char *);
-int is_inet_addr (char *);
-#ifdef USE_IPV6
-int is_inet6_addr (char *);
-#endif
-int is_hostname (char *);
-
 int is_integer (char *);
 int is_intpos (char *);
 int is_intneg (char *);