1 files changed, 303 insertions, 0 deletions

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];
+}