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

1 files changed, 228 insertions, 0 deletions

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