Spent the day working on backwards compatability using getaddrinfo()

Moved getaddrinfo.? and gethostbyname.? from lib/ to plugins/ due to
problems with compiling into the libnagiosplug.a as it required linking
against socket libraries which are unneeded except for network based
plugins.
This code should hopefully happily work for all systems and has been tested
prior to commit on Debian GNU/Linux, SPARC Solaris 7 and SPARC Solaris 9.


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@424 f882894a-f735-0410-b71e-b25c423dba1c

9 files changed, 810 insertions, 130 deletions

diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 2524e1a..a884b45 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 0000000..12ac67d
--- /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 0000000..5bcc884
--- /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 0000000..d151606
--- /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 0000000..2b96399
--- /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 c0e82da..4234c43 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 3ea5166..6c8eed3 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 7361323..e204e23 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 89ada6f..43b612c 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 *);