Adding upstream version 2.3.5.upstream/2.3.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2704 insertions, 0 deletions

diff --git a/plugins/check_curl.c b/plugins/check_curl.c
new file mode 100644
index 0000000..153e492
--- /dev/null
+++ b/plugins/check_curl.c
@@ -0,0 +1,2704 @@
+/*****************************************************************************
+*
+* Monitoring check_curl plugin
+*
+* License: GPL
+* Copyright (c) 1999-2019 Monitoring Plugins Development Team
+*
+* Description:
+*
+* This file contains the check_curl plugin
+*
+* This plugin tests the HTTP service on the specified host. It can test
+* normal (http) and secure (https) servers, follow redirects, search for
+* strings and regular expressions, check connection times, and report on
+* certificate expiration times.
+*
+* This plugin uses functions from the curl library, see
+* http://curl.haxx.se
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program 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 General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+*
+*****************************************************************************/
+const char *progname = "check_curl";
+
+const char *copyright = "2006-2019";
+const char *email = "devel@monitoring-plugins.org";
+
+#include <stdbool.h>
+#include <ctype.h>
+
+#include "common.h"
+#include "utils.h"
+
+#ifndef LIBCURL_PROTOCOL_HTTP
+#error libcurl compiled without HTTP support, compiling check_curl plugin does not makes a lot of sense
+#endif
+
+#include "curl/curl.h"
+#include "curl/easy.h"
+
+#include "picohttpparser.h"
+
+#include "uriparser/Uri.h"
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#if defined(HAVE_SSL) && defined(USE_OPENSSL)
+#include <openssl/opensslv.h>
+#endif
+
+#include <netdb.h>
+
+#define MAKE_LIBCURL_VERSION(major, minor, patch) ((major)*0x10000 + (minor)*0x100 + (patch))
+
+#define DEFAULT_BUFFER_SIZE 2048
+#define DEFAULT_SERVER_URL "/"
+#define HTTP_EXPECT "HTTP/"
+#define INET_ADDR_MAX_SIZE INET6_ADDRSTRLEN
+enum {
+  MAX_IPV4_HOSTLENGTH = 255,
+  HTTP_PORT = 80,
+  HTTPS_PORT = 443,
+  MAX_PORT = 65535,
+  DEFAULT_MAX_REDIRS = 15
+};
+
+enum {
+  STICKY_NONE = 0,
+  STICKY_HOST = 1,
+  STICKY_PORT = 2
+};
+
+enum {
+  FOLLOW_HTTP_CURL = 0,
+  FOLLOW_LIBCURL = 1
+};
+
+/* for buffers for header and body */
+typedef struct {
+  char *buf;
+  size_t buflen;
+  size_t bufsize;
+} curlhelp_write_curlbuf;
+
+/* for buffering the data sent in PUT */
+typedef struct {
+  char *buf;
+  size_t buflen;
+  off_t pos;
+} curlhelp_read_curlbuf;
+
+/* for parsing the HTTP status line */
+typedef struct {
+  int http_major;   /* major version of the protocol, always 1 (HTTP/0.9
+                     * never reached the big internet most likely) */
+  int http_minor;   /* minor version of the protocol, usually 0 or 1 */
+  int http_code;    /* HTTP return code as in RFC 2145 */
+  int http_subcode; /* Microsoft IIS extension, HTTP subcodes, see
+                     * http://support.microsoft.com/kb/318380/en-us */
+  const char *msg;  /* the human readable message */
+  char *first_line; /* a copy of the first line */
+} curlhelp_statusline;
+
+/* to know the underlying SSL library used by libcurl */
+typedef enum curlhelp_ssl_library {
+  CURLHELP_SSL_LIBRARY_UNKNOWN,
+  CURLHELP_SSL_LIBRARY_OPENSSL,
+  CURLHELP_SSL_LIBRARY_LIBRESSL,
+  CURLHELP_SSL_LIBRARY_GNUTLS,
+  CURLHELP_SSL_LIBRARY_NSS
+} curlhelp_ssl_library;
+
+enum {
+  REGS = 2,
+  MAX_RE_SIZE = 1024
+};
+#include "regex.h"
+regex_t preg;
+regmatch_t pmatch[REGS];
+char regexp[MAX_RE_SIZE];
+int cflags = REG_NOSUB | REG_EXTENDED | REG_NEWLINE;
+int errcode;
+bool invert_regex = false;
+
+char *server_address = NULL;
+char *host_name = NULL;
+char *server_url = 0;
+char server_ip[DEFAULT_BUFFER_SIZE];
+struct curl_slist *server_ips = NULL;
+bool specify_port = false;
+unsigned short server_port = HTTP_PORT;
+unsigned short virtual_port = 0;
+int host_name_length;
+char output_header_search[30] = "";
+char output_string_search[30] = "";
+char *warning_thresholds = NULL;
+char *critical_thresholds = NULL;
+int days_till_exp_warn, days_till_exp_crit;
+thresholds *thlds;
+char user_agent[DEFAULT_BUFFER_SIZE];
+int verbose = 0;
+bool show_extended_perfdata = false;
+bool show_body = false;
+int min_page_len = 0;
+int max_page_len = 0;
+int redir_depth = 0;
+int max_depth = DEFAULT_MAX_REDIRS;
+char *http_method = NULL;
+char *http_post_data = NULL;
+char *http_content_type = NULL;
+CURL *curl;
+bool curl_global_initialized = false;
+bool curl_easy_initialized = false;
+struct curl_slist *header_list = NULL;
+bool body_buf_initialized = false;
+curlhelp_write_curlbuf body_buf;
+bool header_buf_initialized = false;
+curlhelp_write_curlbuf header_buf;
+bool status_line_initialized = false;
+curlhelp_statusline status_line;
+bool put_buf_initialized = false;
+curlhelp_read_curlbuf put_buf;
+char http_header[DEFAULT_BUFFER_SIZE];
+long code;
+long socket_timeout = DEFAULT_SOCKET_TIMEOUT;
+double total_time;
+double time_connect;
+double time_appconnect;
+double time_headers;
+double time_firstbyte;
+char errbuf[MAX_INPUT_BUFFER];
+CURLcode res;
+char url[DEFAULT_BUFFER_SIZE];
+char msg[DEFAULT_BUFFER_SIZE];
+char perfstring[DEFAULT_BUFFER_SIZE];
+char header_expect[MAX_INPUT_BUFFER] = "";
+char string_expect[MAX_INPUT_BUFFER] = "";
+char server_expect[MAX_INPUT_BUFFER] = HTTP_EXPECT;
+int server_expect_yn = 0;
+char user_auth[MAX_INPUT_BUFFER] = "";
+char proxy_auth[MAX_INPUT_BUFFER] = "";
+char **http_opt_headers;
+int http_opt_headers_count = 0;
+bool display_html = false;
+int onredirect = STATE_OK;
+int followmethod = FOLLOW_HTTP_CURL;
+int followsticky = STICKY_NONE;
+bool use_ssl = false;
+bool use_sni = true;
+bool check_cert = false;
+bool continue_after_check_cert = false;
+typedef union {
+  struct curl_slist* to_info;
+  struct curl_certinfo* to_certinfo;
+} cert_ptr_union;
+cert_ptr_union cert_ptr;
+int ssl_version = CURL_SSLVERSION_DEFAULT;
+char *client_cert = NULL;
+char *client_privkey = NULL;
+char *ca_cert = NULL;
+bool verify_peer_and_host = false;
+bool is_openssl_callback = false;
+#if defined(HAVE_SSL) && defined(USE_OPENSSL)
+X509 *cert = NULL;
+#endif /* defined(HAVE_SSL) && defined(USE_OPENSSL) */
+bool no_body = false;
+int maximum_age = -1;
+int address_family = AF_UNSPEC;
+curlhelp_ssl_library ssl_library = CURLHELP_SSL_LIBRARY_UNKNOWN;
+int curl_http_version = CURL_HTTP_VERSION_NONE;
+bool automatic_decompression = false;
+char *cookie_jar_file = NULL;
+
+bool process_arguments (int, char**);
+void handle_curl_option_return_code (CURLcode res, const char* option);
+int check_http (void);
+void redir (curlhelp_write_curlbuf*);
+char *perfd_time (double microsec);
+char *perfd_time_connect (double microsec);
+char *perfd_time_ssl (double microsec);
+char *perfd_time_firstbyte (double microsec);
+char *perfd_time_headers (double microsec);
+char *perfd_time_transfer (double microsec);
+char *perfd_size (int page_len);
+void print_help (void);
+void print_usage (void);
+void print_curl_version (void);
+int curlhelp_initwritebuffer (curlhelp_write_curlbuf*);
+size_t curlhelp_buffer_write_callback(void*, size_t , size_t , void*);
+void curlhelp_freewritebuffer (curlhelp_write_curlbuf*);
+int curlhelp_initreadbuffer (curlhelp_read_curlbuf *, const char *, size_t);
+size_t curlhelp_buffer_read_callback(void *, size_t , size_t , void *);
+void curlhelp_freereadbuffer (curlhelp_read_curlbuf *);
+curlhelp_ssl_library curlhelp_get_ssl_library ();
+const char* curlhelp_get_ssl_library_string (curlhelp_ssl_library);
+int net_noopenssl_check_certificate (cert_ptr_union*, int, int);
+
+int curlhelp_parse_statusline (const char*, curlhelp_statusline *);
+void curlhelp_free_statusline (curlhelp_statusline *);
+char *get_header_value (const struct phr_header* headers, const size_t nof_headers, const char* header);
+int check_document_dates (const curlhelp_write_curlbuf *, char (*msg)[DEFAULT_BUFFER_SIZE]);
+int get_content_length (const curlhelp_write_curlbuf* header_buf, const curlhelp_write_curlbuf* body_buf);
+
+#if defined(HAVE_SSL) && defined(USE_OPENSSL)
+int np_net_ssl_check_certificate(X509 *certificate, int days_till_exp_warn, int days_till_exp_crit);
+#endif /* defined(HAVE_SSL) && defined(USE_OPENSSL) */
+
+void remove_newlines (char *);
+void test_file (char *);
+
+int
+main (int argc, char **argv)
+{
+  int result = STATE_UNKNOWN;
+
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  /* Parse extra opts if any */
+  argv = np_extra_opts (&argc, argv, progname);
+
+  /* set defaults */
+  snprintf( user_agent, DEFAULT_BUFFER_SIZE, "%s/v%s (monitoring-plugins %s, %s)",
+    progname, NP_VERSION, VERSION, curl_version());
+
+  /* parse arguments */
+  if (process_arguments (argc, argv) == false)
+    usage4 (_("Could not parse arguments"));
+
+  if (display_html)
+    printf ("<A HREF=\"%s://%s:%d%s\" target=\"_blank\">",
+      use_ssl ? "https" : "http",
+      host_name ? host_name : server_address,
+      virtual_port ? virtual_port : server_port,
+      server_url);
+
+  result = check_http ();
+  return result;
+}
+
+#ifdef HAVE_SSL
+#ifdef USE_OPENSSL
+
+int verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
+{
+	(void) preverify_ok;
+  /* TODO: we get all certificates of the chain, so which ones
+   * should we test?
+   * TODO: is the last certificate always the server certificate?
+   */
+  cert = X509_STORE_CTX_get_current_cert(x509_ctx);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+  X509_up_ref(cert);
+#endif
+  if (verbose>=2) {
+    puts("* SSL verify callback with certificate:");
+    X509_NAME *subject, *issuer;
+    printf("*   issuer:\n");
+    issuer = X509_get_issuer_name( cert );
+    X509_NAME_print_ex_fp(stdout, issuer, 5, XN_FLAG_MULTILINE);
+    printf("* curl verify_callback:\n*   subject:\n");
+    subject = X509_get_subject_name( cert );
+    X509_NAME_print_ex_fp(stdout, subject, 5, XN_FLAG_MULTILINE);
+    puts("");
+  }
+  return 1;
+}
+
+CURLcode sslctxfun(CURL *curl, SSL_CTX *sslctx, void *parm)
+{
+	(void) curl; // ignore unused parameter
+	(void) parm; // ignore unused parameter
+  SSL_CTX_set_verify(sslctx, SSL_VERIFY_PEER, verify_callback);
+
+  return CURLE_OK;
+}
+
+#endif /* USE_OPENSSL */
+#endif /* HAVE_SSL */
+
+/* returns a string "HTTP/1.x" or "HTTP/2" */
+static char *string_statuscode (int major, int minor)
+{
+  static char buf[10];
+
+  switch (major) {
+    case 1:
+      snprintf (buf, sizeof (buf), "HTTP/%d.%d", major, minor);
+      break;
+    case 2:
+    case 3:
+      snprintf (buf, sizeof (buf), "HTTP/%d", major);
+      break;
+    default:
+      /* assuming here HTTP/N with N>=4 */
+      snprintf (buf, sizeof (buf), "HTTP/%d", major);
+      break;
+  }
+
+  return buf;
+}
+
+/* Checks if the server 'reply' is one of the expected 'statuscodes' */
+static int
+expected_statuscode (const char *reply, const char *statuscodes)
+{
+  char *expected, *code;
+  int result = 0;
+
+  if ((expected = strdup (statuscodes)) == NULL)
+    die (STATE_UNKNOWN, _("HTTP UNKNOWN - Memory allocation error\n"));
+
+  for (code = strtok (expected, ","); code != NULL; code = strtok (NULL, ","))
+    if (strstr (reply, code) != NULL) {
+      result = 1;
+      break;
+    }
+
+  free (expected);
+  return result;
+}
+
+void
+handle_curl_option_return_code (CURLcode res, const char* option)
+{
+  if (res != CURLE_OK) {
+		snprintf (msg,
+			DEFAULT_BUFFER_SIZE,
+			_("Error while setting cURL option '%s': cURL returned %d - %s"),
+			option,
+			res,
+			curl_easy_strerror(res));
+    die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+  }
+}
+
+int
+lookup_host (const char *host, char *buf, size_t buflen)
+{
+  struct addrinfo hints, *res, *result;
+  char addrstr[100];
+  size_t addrstr_len;
+  int errcode;
+  void *ptr;
+  size_t buflen_remaining = buflen - 1;
+
+  memset (&hints, 0, sizeof (hints));
+  hints.ai_family = address_family;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_flags |= AI_CANONNAME;
+
+  errcode = getaddrinfo (host, NULL, &hints, &result);
+  if (errcode != 0)
+    return errcode;
+
+  strcpy(buf, "");
+  res = result;
+
+  while (res) {
+    switch (res->ai_family) {
+      case AF_INET:
+        ptr = &((struct sockaddr_in *) res->ai_addr)->sin_addr;
+        break;
+      case AF_INET6:
+        ptr = &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
+        break;
+    }
+
+    inet_ntop (res->ai_family, ptr, addrstr, 100);
+    if (verbose >= 1) {
+      printf ("* getaddrinfo IPv%d address: %s\n",
+        res->ai_family == PF_INET6 ? 6 : 4, addrstr);
+    }
+
+    // Append all IPs to buf as a comma-separated string
+    addrstr_len = strlen(addrstr);
+    if (buflen_remaining > addrstr_len + 1) {
+      if (buf[0] != '\0') {
+        strncat(buf, ",", buflen_remaining);
+        buflen_remaining -= 1;
+      }
+      strncat(buf, addrstr, buflen_remaining);
+      buflen_remaining -= addrstr_len;
+    }
+
+    res = res->ai_next;
+  }
+
+  freeaddrinfo(result);
+
+  return 0;
+}
+
+static void
+cleanup (void)
+{
+  if (status_line_initialized) curlhelp_free_statusline(&status_line);
+  status_line_initialized = false;
+  if (curl_easy_initialized) curl_easy_cleanup (curl);
+  curl_easy_initialized = false;
+  if (curl_global_initialized) curl_global_cleanup ();
+  curl_global_initialized = false;
+  if (body_buf_initialized) curlhelp_freewritebuffer (&body_buf);
+  body_buf_initialized = false;
+  if (header_buf_initialized) curlhelp_freewritebuffer (&header_buf);
+  header_buf_initialized = false;
+  if (put_buf_initialized) curlhelp_freereadbuffer (&put_buf);
+  put_buf_initialized = false;
+}
+
+int
+check_http (void)
+{
+  int result = STATE_OK;
+  int page_len = 0;
+  int i;
+  char *force_host_header = NULL;
+  struct curl_slist *host = NULL;
+  char addrstr[DEFAULT_BUFFER_SIZE/2];
+  char dnscache[DEFAULT_BUFFER_SIZE];
+
+  /* initialize curl */
+  if (curl_global_init (CURL_GLOBAL_DEFAULT) != CURLE_OK)
+    die (STATE_UNKNOWN, "HTTP UNKNOWN - curl_global_init failed\n");
+  curl_global_initialized = true;
+
+  if ((curl = curl_easy_init()) == NULL) {
+    die (STATE_UNKNOWN, "HTTP UNKNOWN - curl_easy_init failed\n");
+  }
+  curl_easy_initialized = true;
+
+  /* register cleanup function to shut down libcurl properly */
+  atexit (cleanup);
+
+  if (verbose >= 1)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_VERBOSE, 1), "CURLOPT_VERBOSE");
+
+  /* print everything on stdout like check_http would do */
+  handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_STDERR, stdout), "CURLOPT_STDERR");
+
+  if (automatic_decompression)
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 21, 6)
+    handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, ""), "CURLOPT_ACCEPT_ENCODING");
+#else
+    handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_ENCODING, ""), "CURLOPT_ENCODING");
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 21, 6) */
+
+  /* initialize buffer for body of the answer */
+  if (curlhelp_initwritebuffer(&body_buf) < 0)
+    die (STATE_UNKNOWN, "HTTP CRITICAL - out of memory allocating buffer for body\n");
+  body_buf_initialized = true;
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, (curl_write_callback)curlhelp_buffer_write_callback), "CURLOPT_WRITEFUNCTION");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_WRITEDATA, (void *)&body_buf), "CURLOPT_WRITEDATA");
+
+  /* initialize buffer for header of the answer */
+  if (curlhelp_initwritebuffer( &header_buf ) < 0)
+    die (STATE_UNKNOWN, "HTTP CRITICAL - out of memory allocating buffer for header\n" );
+  header_buf_initialized = true;
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_HEADERFUNCTION, (curl_write_callback)curlhelp_buffer_write_callback), "CURLOPT_HEADERFUNCTION");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_WRITEHEADER, (void *)&header_buf), "CURLOPT_WRITEHEADER");
+
+  /* set the error buffer */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, errbuf), "CURLOPT_ERRORBUFFER");
+
+  /* set timeouts */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CONNECTTIMEOUT, socket_timeout), "CURLOPT_CONNECTTIMEOUT");
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_TIMEOUT, socket_timeout), "CURLOPT_TIMEOUT");
+
+  // fill dns resolve cache to make curl connect to the given server_address instead of the host_name, only required for ssl, because we use the host_name later on to make SNI happy
+  if(use_ssl && host_name != NULL) {
+      if ( (res=lookup_host (server_address, addrstr, DEFAULT_BUFFER_SIZE/2)) != 0) {
+				snprintf (msg,
+					DEFAULT_BUFFER_SIZE,
+					_("Unable to lookup IP address for '%s': getaddrinfo returned %d - %s"),
+					server_address,
+					res,
+					gai_strerror (res));
+				die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+      }
+      snprintf (dnscache, DEFAULT_BUFFER_SIZE, "%s:%d:%s", host_name, server_port, addrstr);
+      host = curl_slist_append(NULL, dnscache);
+      curl_easy_setopt(curl, CURLOPT_RESOLVE, host);
+      if (verbose>=1)
+        printf ("* curl CURLOPT_RESOLVE: %s\n", dnscache);
+  }
+
+  // If server_address is an IPv6 address it must be surround by square brackets
+  struct in6_addr tmp_in_addr;
+  if (inet_pton(AF_INET6, server_address, &tmp_in_addr) == 1) {
+    char *new_server_address = malloc(strlen(server_address) + 3);
+    if (new_server_address == NULL) {
+      die(STATE_UNKNOWN, "HTTP UNKNOWN - Unable to allocate memory\n");
+    }
+    snprintf(new_server_address, strlen(server_address)+3, "[%s]", server_address);
+    free(server_address);
+    server_address = new_server_address;
+  }
+
+  /* compose URL: use the address we want to connect to, set Host: header later */
+  snprintf (url, DEFAULT_BUFFER_SIZE, "%s://%s:%d%s",
+      use_ssl ? "https" : "http",
+      ( use_ssl & ( host_name != NULL ) ) ? host_name : server_address,
+      server_port,
+      server_url
+  );
+
+  if (verbose>=1)
+    printf ("* curl CURLOPT_URL: %s\n", url);
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_URL, url), "CURLOPT_URL");
+
+  /* extract proxy information for legacy proxy https requests */
+  if (!strcmp(http_method, "CONNECT") || strstr(server_url, "http") == server_url) {
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_PROXY, server_address), "CURLOPT_PROXY");
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_PROXYPORT, (long)server_port), "CURLOPT_PROXYPORT");
+    if (verbose>=2)
+      printf ("* curl CURLOPT_PROXY: %s:%d\n", server_address, server_port);
+    http_method = "GET";
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_URL, server_url), "CURLOPT_URL");
+  }
+
+  /* disable body for HEAD request */
+  if (http_method && !strcmp (http_method, "HEAD" )) {
+    no_body = true;
+  }
+
+  /* set HTTP protocol version */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_HTTP_VERSION, curl_http_version), "CURLOPT_HTTP_VERSION");
+
+  /* set HTTP method */
+  if (http_method) {
+    if (!strcmp(http_method, "POST"))
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_POST, 1), "CURLOPT_POST");
+    else if (!strcmp(http_method, "PUT"))
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_UPLOAD, 1), "CURLOPT_UPLOAD");
+    else
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CUSTOMREQUEST, http_method), "CURLOPT_CUSTOMREQUEST");
+  }
+
+  /* check if Host header is explicitly set in options */
+  if (http_opt_headers_count) {
+    for (i = 0; i < http_opt_headers_count ; i++) {
+      if (strncmp(http_opt_headers[i], "Host:", 5) == 0) {
+        force_host_header = http_opt_headers[i];
+      }
+    }
+  }
+
+  /* set hostname (virtual hosts), not needed if CURLOPT_CONNECT_TO is used, but left in anyway */
+  if(host_name != NULL && force_host_header == NULL) {
+    if((virtual_port != HTTP_PORT && !use_ssl) || (virtual_port != HTTPS_PORT && use_ssl)) {
+      snprintf(http_header, DEFAULT_BUFFER_SIZE, "Host: %s:%d", host_name, virtual_port);
+    } else {
+      snprintf(http_header, DEFAULT_BUFFER_SIZE, "Host: %s", host_name);
+    }
+    header_list = curl_slist_append (header_list, http_header);
+  }
+
+  /* always close connection, be nice to servers */
+  snprintf (http_header, DEFAULT_BUFFER_SIZE, "Connection: close");
+  header_list = curl_slist_append (header_list, http_header);
+
+  /* attach additional headers supplied by the user */
+  /* optionally send any other header tag */
+  if (http_opt_headers_count) {
+    for (i = 0; i < http_opt_headers_count ; i++) {
+      header_list = curl_slist_append (header_list, http_opt_headers[i]);
+    }
+    /* This cannot be free'd here because a redirection will then try to access this and segfault */
+    /* Covered in a testcase in tests/check_http.t */
+    /* free(http_opt_headers); */
+  }
+
+  /* set HTTP headers */
+  handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_HTTPHEADER, header_list ), "CURLOPT_HTTPHEADER");
+
+#ifdef LIBCURL_FEATURE_SSL
+
+  /* set SSL version, warn about insecure or unsupported versions */
+  if (use_ssl) {
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSLVERSION, ssl_version), "CURLOPT_SSLVERSION");
+  }
+
+  /* client certificate and key to present to server (SSL) */
+  if (client_cert)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSLCERT, client_cert), "CURLOPT_SSLCERT");
+  if (client_privkey)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSLKEY, client_privkey), "CURLOPT_SSLKEY");
+  if (ca_cert) {
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CAINFO, ca_cert), "CURLOPT_CAINFO");
+  }
+  if (ca_cert || verify_peer_and_host) {
+    /* per default if we have a CA verify both the peer and the
+     * hostname in the certificate, can be switched off later */
+    handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_SSL_VERIFYPEER, 1), "CURLOPT_SSL_VERIFYPEER");
+    handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_SSL_VERIFYHOST, 2), "CURLOPT_SSL_VERIFYHOST");
+  } else {
+    /* backward-compatible behaviour, be tolerant in checks
+     * TODO: depending on more options have aspects we want
+     * to be less tolerant about ssl verfications
+     */
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSL_VERIFYPEER, 0), "CURLOPT_SSL_VERIFYPEER");
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_SSL_VERIFYHOST, 0), "CURLOPT_SSL_VERIFYHOST");
+  }
+
+  /* detect SSL library used by libcurl */
+  ssl_library = curlhelp_get_ssl_library ();
+
+  /* try hard to get a stack of certificates to verify against */
+  if (check_cert) {
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1)
+    /* inform curl to report back certificates */
+    switch (ssl_library) {
+      case CURLHELP_SSL_LIBRARY_OPENSSL:
+      case CURLHELP_SSL_LIBRARY_LIBRESSL:
+        /* set callback to extract certificate with OpenSSL context function (works with
+         * OpenSSL-style libraries only!) */
+#ifdef USE_OPENSSL
+        /* libcurl and monitoring plugins built with OpenSSL, good */
+        handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+        is_openssl_callback = true;
+#else /* USE_OPENSSL */
+#endif /* USE_OPENSSL */
+        /* libcurl is built with OpenSSL, monitoring plugins, so falling
+         * back to manually extracting certificate information */
+        handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CERTINFO, 1L), "CURLOPT_CERTINFO");
+        break;
+
+      case CURLHELP_SSL_LIBRARY_NSS:
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+        /* NSS: support for CERTINFO is implemented since 7.34.0 */
+        handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CERTINFO, 1L), "CURLOPT_CERTINFO");
+#else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (libcurl linked with SSL library '%s' is too old)\n", curlhelp_get_ssl_library_string (ssl_library));
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        break;
+
+      case CURLHELP_SSL_LIBRARY_GNUTLS:
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 42, 0)
+        /* GnuTLS: support for CERTINFO is implemented since 7.42.0 */
+        handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CERTINFO, 1L), "CURLOPT_CERTINFO");
+#else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 42, 0) */
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (libcurl linked with SSL library '%s' is too old)\n", curlhelp_get_ssl_library_string (ssl_library));
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 42, 0) */
+        break;
+
+      case CURLHELP_SSL_LIBRARY_UNKNOWN:
+      default:
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (unknown SSL library '%s', must implement first)\n", curlhelp_get_ssl_library_string (ssl_library));
+        break;
+    }
+#else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1) */
+    /* old libcurl, our only hope is OpenSSL, otherwise we are out of luck */
+    if (ssl_library == CURLHELP_SSL_LIBRARY_OPENSSL || ssl_library == CURLHELP_SSL_LIBRARY_LIBRESSL)
+      handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+    else
+      die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (no CURLOPT_SSL_CTX_FUNCTION, no OpenSSL library or libcurl too old and has no CURLOPT_CERTINFO)\n");
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1) */
+  }
+
+#endif /* LIBCURL_FEATURE_SSL */
+
+  /* set default or user-given user agent identification */
+  handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_USERAGENT, user_agent), "CURLOPT_USERAGENT");
+
+  /* proxy-authentication */
+  if (strcmp(proxy_auth, ""))
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_PROXYUSERPWD, proxy_auth), "CURLOPT_PROXYUSERPWD");
+
+  /* authentication */
+  if (strcmp(user_auth, ""))
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_USERPWD, user_auth), "CURLOPT_USERPWD");
+
+  /* TODO: parameter auth method, bitfield of following methods:
+   * CURLAUTH_BASIC (default)
+   * CURLAUTH_DIGEST
+   * CURLAUTH_DIGEST_IE
+   * CURLAUTH_NEGOTIATE
+   * CURLAUTH_NTLM
+   * CURLAUTH_NTLM_WB
+   *
+   * convenience tokens for typical sets of methods:
+   * CURLAUTH_ANYSAFE: most secure, without BASIC
+   * or CURLAUTH_ANY: most secure, even BASIC if necessary
+   *
+   * handle_curl_option_return_code (curl_easy_setopt( curl, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST ), "CURLOPT_HTTPAUTH");
+   */
+
+  /* handle redirections */
+  if (onredirect == STATE_DEPENDENT) {
+    if( followmethod == FOLLOW_LIBCURL ) {
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1), "CURLOPT_FOLLOWLOCATION");
+
+      /* default -1 is infinite, not good, could lead to zombie plugins!
+         Setting it to one bigger than maximal limit to handle errors nicely below
+       */
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_MAXREDIRS, max_depth+1), "CURLOPT_MAXREDIRS");
+
+      /* for now allow only http and https (we are a http(s) check plugin in the end) */
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 85, 0)
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_REDIR_PROTOCOLS_STR, "http,https"), "CURLOPT_REDIR_PROTOCOLS_STR");
+#elif LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 4)
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS), "CURLOPT_REDIRECT_PROTOCOLS");
+#endif
+
+      /* TODO: handle the following aspects of redirection, make them
+       * command line options too later:
+        CURLOPT_POSTREDIR: method switch
+        CURLINFO_REDIRECT_URL: custom redirect option
+        CURLOPT_REDIRECT_PROTOCOLS: allow people to step outside safe protocols
+        CURLINFO_REDIRECT_COUNT: get the number of redirects, print it, maybe a range option here is nice like for expected page size?
+      */
+    } else {
+      /* old style redirection is handled below */
+    }
+  }
+
+  /* no-body */
+  if (no_body)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_NOBODY, 1), "CURLOPT_NOBODY");
+
+  /* IPv4 or IPv6 forced DNS resolution */
+  if (address_family == AF_UNSPEC)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_WHATEVER), "CURLOPT_IPRESOLVE(CURL_IPRESOLVE_WHATEVER)");
+  else if (address_family == AF_INET)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4), "CURLOPT_IPRESOLVE(CURL_IPRESOLVE_V4)");
+#if defined (USE_IPV6) && defined (LIBCURL_FEATURE_IPV6)
+  else if (address_family == AF_INET6)
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V6), "CURLOPT_IPRESOLVE(CURL_IPRESOLVE_V6)");
+#endif
+
+  /* either send http POST data (any data, not only POST)*/
+  if (!strcmp(http_method, "POST") ||!strcmp(http_method, "PUT")) {
+    /* set content of payload for POST and PUT */
+    if (http_content_type) {
+      snprintf (http_header, DEFAULT_BUFFER_SIZE, "Content-Type: %s", http_content_type);
+      header_list = curl_slist_append (header_list, http_header);
+    }
+    /* NULL indicates "HTTP Continue" in libcurl, provide an empty string
+     * in case of no POST/PUT data */
+    if (!http_post_data)
+      http_post_data = "";
+    if (!strcmp(http_method, "POST")) {
+      /* POST method, set payload with CURLOPT_POSTFIELDS */
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_POSTFIELDS, http_post_data), "CURLOPT_POSTFIELDS");
+    } else if (!strcmp(http_method, "PUT")) {
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_READFUNCTION, (curl_read_callback)curlhelp_buffer_read_callback), "CURLOPT_READFUNCTION");
+      if (curlhelp_initreadbuffer (&put_buf, http_post_data, strlen (http_post_data)) < 0)
+        die (STATE_UNKNOWN, "HTTP CRITICAL - out of memory allocating read buffer for PUT\n");
+      put_buf_initialized = true;
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_READDATA, (void *)&put_buf), "CURLOPT_READDATA");
+      handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_INFILESIZE, (curl_off_t)strlen (http_post_data)), "CURLOPT_INFILESIZE");
+    }
+  }
+
+  /* cookie handling */
+  if (cookie_jar_file != NULL) {
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_COOKIEJAR, cookie_jar_file), "CURLOPT_COOKIEJAR");
+    handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_COOKIEFILE, cookie_jar_file), "CURLOPT_COOKIEFILE");
+  }
+
+  /* do the request */
+  res = curl_easy_perform(curl);
+
+  if (verbose>=2 && http_post_data)
+    printf ("**** REQUEST CONTENT ****\n%s\n", http_post_data);
+
+  /* free header and server IP resolve lists, we don't need it anymore */
+  curl_slist_free_all (header_list); header_list = NULL;
+  curl_slist_free_all (server_ips); server_ips = NULL;
+  if (host) {
+    curl_slist_free_all (host); host = NULL;
+  }
+
+  /* Curl errors, result in critical Nagios state */
+  if (res != CURLE_OK) {
+		snprintf (msg,
+			DEFAULT_BUFFER_SIZE,
+			_("Invalid HTTP response received from host on port %d: cURL returned %d - %s"),
+			server_port,
+			res,
+			errbuf[0] ? errbuf : curl_easy_strerror(res));
+		die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+  }
+
+  /* certificate checks */
+#ifdef LIBCURL_FEATURE_SSL
+  if (use_ssl) {
+    if (check_cert) {
+      if (is_openssl_callback) {
+#ifdef USE_OPENSSL
+        /* check certificate with OpenSSL functions, curl has been built against OpenSSL
+         * and we actually have OpenSSL in the monitoring tools
+         */
+        result = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
+        if (!continue_after_check_cert) {
+          return result;
+        }
+#else /* USE_OPENSSL */
+        die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates - OpenSSL callback used and not linked against OpenSSL\n");
+#endif /* USE_OPENSSL */
+      } else {
+        int i;
+        struct curl_slist *slist;
+
+        cert_ptr.to_info = NULL;
+        res = curl_easy_getinfo (curl, CURLINFO_CERTINFO, &cert_ptr.to_info);
+        if (!res && cert_ptr.to_info) {
+#ifdef USE_OPENSSL
+          /* We have no OpenSSL in libcurl, but we can use OpenSSL for X509 cert parsing
+           * We only check the first certificate and assume it's the one of the server
+           */
+          const char* raw_cert = NULL;
+          for (i = 0; i < cert_ptr.to_certinfo->num_of_certs; i++) {
+            for (slist = cert_ptr.to_certinfo->certinfo[i]; slist; slist = slist->next) {
+              if (verbose >= 2)
+                printf ("%d ** %s\n", i, slist->data);
+              if (strncmp (slist->data, "Cert:", 5) == 0) {
+                raw_cert = &slist->data[5];
+                goto GOT_FIRST_CERT;
+              }
+            }
+          }
+GOT_FIRST_CERT:
+          if (!raw_cert) {
+						snprintf (msg,
+							DEFAULT_BUFFER_SIZE,
+							_("Cannot retrieve certificates from CERTINFO information - certificate data was empty"));
+						die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+          }
+          BIO* cert_BIO = BIO_new (BIO_s_mem());
+          BIO_write (cert_BIO, raw_cert, strlen(raw_cert));
+          cert = PEM_read_bio_X509 (cert_BIO, NULL, NULL, NULL);
+          if (!cert) {
+						snprintf (msg,
+							DEFAULT_BUFFER_SIZE,
+							_("Cannot read certificate from CERTINFO information - BIO error"));
+						die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+          }
+          BIO_free (cert_BIO);
+          result = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
+          if (!continue_after_check_cert) {
+            return result;
+          }
+#else /* USE_OPENSSL */
+          /* We assume we don't have OpenSSL and np_net_ssl_check_certificate at our disposal,
+           * so we use the libcurl CURLINFO data
+           */
+          result = net_noopenssl_check_certificate(&cert_ptr, days_till_exp_warn, days_till_exp_crit);
+          if (!continue_after_check_cert) {
+            return result;
+          }
+#endif /* USE_OPENSSL */
+        } else {
+					snprintf (msg,
+						DEFAULT_BUFFER_SIZE,
+						_("Cannot retrieve certificates - cURL returned %d - %s"),
+						res,
+						curl_easy_strerror(res));
+					die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
+        }
+      }
+    }
+  }
+#endif /* LIBCURL_FEATURE_SSL */
+
+  /* we got the data and we executed the request in a given time, so we can append
+   * performance data to the answer always
+   */
+  handle_curl_option_return_code (curl_easy_getinfo (curl, CURLINFO_TOTAL_TIME, &total_time), "CURLINFO_TOTAL_TIME");
+  page_len = get_content_length(&header_buf, &body_buf);
+  if(show_extended_perfdata) {
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_CONNECT_TIME, &time_connect), "CURLINFO_CONNECT_TIME");
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_APPCONNECT_TIME, &time_appconnect), "CURLINFO_APPCONNECT_TIME");
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_PRETRANSFER_TIME, &time_headers), "CURLINFO_PRETRANSFER_TIME");
+    handle_curl_option_return_code (curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME, &time_firstbyte), "CURLINFO_STARTTRANSFER_TIME");
+    snprintf(perfstring, DEFAULT_BUFFER_SIZE, "%s %s %s %s %s %s %s",
+      perfd_time(total_time),
+      perfd_size(page_len),
+      perfd_time_connect(time_connect),
+      use_ssl ? perfd_time_ssl (time_appconnect-time_connect) : "",
+      perfd_time_headers(time_headers - time_appconnect),
+      perfd_time_firstbyte(time_firstbyte - time_headers),
+      perfd_time_transfer(total_time-time_firstbyte)
+    );
+  } else {
+    snprintf(perfstring, DEFAULT_BUFFER_SIZE, "%s %s",
+      perfd_time(total_time),
+      perfd_size(page_len)
+    );
+  }
+
+  /* return a CRITICAL status if we couldn't read any data */
+  if (strlen(header_buf.buf) == 0 && strlen(body_buf.buf) == 0)
+    die (STATE_CRITICAL, _("HTTP CRITICAL - No header received from host\n"));
+
+  /* get status line of answer, check sanity of HTTP code */
+  if (curlhelp_parse_statusline (header_buf.buf, &status_line) < 0) {
+		snprintf (msg,
+			DEFAULT_BUFFER_SIZE,
+			"Unparsable status line in %.3g seconds response time|%s\n",
+			total_time,
+			perfstring);
+    /* we cannot know the major/minor version here for sure as we cannot parse the first line */
+    die (STATE_CRITICAL, "HTTP CRITICAL HTTP/x.x %ld unknown - %s", code, msg);
+  }
+  status_line_initialized = true;
+
+  /* get result code from cURL */
+  handle_curl_option_return_code (curl_easy_getinfo (curl, CURLINFO_RESPONSE_CODE, &code), "CURLINFO_RESPONSE_CODE");
+  if (verbose>=2)
+    printf ("* curl CURLINFO_RESPONSE_CODE is %ld\n", code);
+
+  /* print status line, header, body if verbose */
+  if (verbose >= 2) {
+    printf ("**** HEADER ****\n%s\n**** CONTENT ****\n%s\n", header_buf.buf,
+                (no_body ? "  [[ skipped ]]" : body_buf.buf));
+  }
+
+  /* make sure the status line matches the response we are looking for */
+  if (!expected_statuscode(status_line.first_line, server_expect)) {
+    if (server_port == HTTP_PORT)
+			snprintf(msg,
+				DEFAULT_BUFFER_SIZE,
+				_("Invalid HTTP response received from host: %s\n"),
+				status_line.first_line);
+    else
+			snprintf(msg,
+					DEFAULT_BUFFER_SIZE,
+					_("Invalid HTTP response received from host on port %d: %s\n"),
+					server_port,
+					status_line.first_line);
+    die (STATE_CRITICAL, "HTTP CRITICAL - %s%s%s", msg,
+      show_body ? "\n" : "",
+      show_body ? body_buf.buf : "");
+  }
+
+  if( server_expect_yn  )  {
+    snprintf(msg, DEFAULT_BUFFER_SIZE, _("Status line output matched \"%s\" - "), server_expect);
+    if (verbose)
+      printf ("%s\n",msg);
+    result = STATE_OK;
+  }
+  else {
+    /* illegal return codes result in a critical state */
+    if (code >= 600 || code < 100) {
+      die (STATE_CRITICAL, _("HTTP CRITICAL: Invalid Status (%d, %.40s)\n"), status_line.http_code, status_line.msg);
+    /* server errors result in a critical state */
+        } else if (code >= 500) {
+      result = STATE_CRITICAL;
+        /* client errors result in a warning state */
+    } else if (code >= 400) {
+      result = STATE_WARNING;
+    /* check redirected page if specified */
+    } else if (code >= 300) {
+      if (onredirect == STATE_DEPENDENT) {
+        if( followmethod == FOLLOW_LIBCURL ) {
+          code = status_line.http_code;
+        } else {
+          /* old check_http style redirection, if we come
+           * back here, we are in the same status as with
+           * the libcurl method
+           */
+          redir (&header_buf);
+        }
+      } else {
+        /* this is a specific code in the command line to
+         * be returned when a redirection is encountered
+         */
+      }
+      result = max_state_alt (onredirect, result);
+    /* all other codes are considered ok */
+    } else {
+      result = STATE_OK;
+    }
+  }
+
+  /* libcurl redirection internally, handle error states here */
+  if( followmethod == FOLLOW_LIBCURL ) {
+    handle_curl_option_return_code (curl_easy_getinfo (curl, CURLINFO_REDIRECT_COUNT, &redir_depth), "CURLINFO_REDIRECT_COUNT");
+    if (verbose >= 2)
+      printf(_("* curl LIBINFO_REDIRECT_COUNT is %d\n"), redir_depth);
+    if (redir_depth > max_depth) {
+      snprintf (msg, DEFAULT_BUFFER_SIZE, "maximum redirection depth %d exceeded in libcurl",
+        max_depth);
+      die (STATE_WARNING, "HTTP WARNING - %s", msg);
+    }
+  }
+
+  /* check status codes, set exit status accordingly */
+  if( status_line.http_code != code ) {
+    die (STATE_CRITICAL, _("HTTP CRITICAL %s %d %s - different HTTP codes (cUrl has %ld)\n"),
+      string_statuscode (status_line.http_major, status_line.http_minor),
+      status_line.http_code, status_line.msg, code);
+  }
+
+  if (maximum_age >= 0) {
+    result = max_state_alt(check_document_dates(&header_buf, &msg), result);
+  }
+
+  /* Page and Header content checks go here */
+
+  if (strlen (header_expect)) {
+    if (!strstr (header_buf.buf, header_expect)) {
+
+      strncpy(&output_header_search[0],header_expect,sizeof(output_header_search));
+
+      if(output_header_search[sizeof(output_header_search)-1]!='\0') {
+        bcopy("...",&output_header_search[sizeof(output_header_search)-4],4);
+      }
+
+				char tmp[DEFAULT_BUFFER_SIZE];
+
+				snprintf (tmp,
+					DEFAULT_BUFFER_SIZE,
+					_("%sheader '%s' not found on '%s://%s:%d%s', "),
+					msg,
+					output_header_search,
+					use_ssl ? "https" : "http",
+					host_name ? host_name : server_address,
+					server_port,
+					server_url);
+
+				strcpy(msg, tmp);
+
+				result = STATE_CRITICAL;
+    }
+  }
+
+  if (strlen (string_expect)) {
+    if (!strstr (body_buf.buf, string_expect)) {
+
+      strncpy(&output_string_search[0],string_expect,sizeof(output_string_search));
+
+      if(output_string_search[sizeof(output_string_search)-1]!='\0') {
+        bcopy("...",&output_string_search[sizeof(output_string_search)-4],4);
+      }
+
+			char tmp[DEFAULT_BUFFER_SIZE];
+
+			snprintf (tmp,
+					DEFAULT_BUFFER_SIZE,
+					_("%sstring '%s' not found on '%s://%s:%d%s', "),
+					msg,
+					output_string_search,
+					use_ssl ? "https" : "http",
+					host_name ? host_name : server_address,
+					server_port,
+					server_url);
+
+			strcpy(msg, tmp);
+
+			result = STATE_CRITICAL;
+    }
+  }
+
+  if (strlen (regexp)) {
+    errcode = regexec (&preg, body_buf.buf, REGS, pmatch, 0);
+    if ((errcode == 0 && !invert_regex) || (errcode == REG_NOMATCH && invert_regex)) {
+      /* OK - No-op to avoid changing the logic around it */
+      result = max_state_alt(STATE_OK, result);
+    }
+    else if ((errcode == REG_NOMATCH && !invert_regex) || (errcode == 0 && invert_regex)) {
+			if (!invert_regex) {
+				char tmp[DEFAULT_BUFFER_SIZE];
+
+				snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%spattern not found, "), msg);
+				strcpy(msg, tmp);
+
+			} else {
+				char tmp[DEFAULT_BUFFER_SIZE];
+
+				snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%spattern found, "), msg);
+				strcpy(msg, tmp);
+
+			}
+			result = STATE_CRITICAL;
+		} else {
+			regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
+
+			char tmp[DEFAULT_BUFFER_SIZE];
+
+			snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sExecute Error: %s, "), msg, errbuf);
+			strcpy(msg, tmp);
+			result = STATE_UNKNOWN;
+		}
+  }
+
+  /* make sure the page is of an appropriate size */
+	if ((max_page_len > 0) && (page_len > max_page_len)) {
+		char tmp[DEFAULT_BUFFER_SIZE];
+
+		snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%spage size %d too large, "), msg, page_len);
+
+		strcpy(msg, tmp);
+
+		result = max_state_alt(STATE_WARNING, result);
+
+	} else if ((min_page_len > 0) && (page_len < min_page_len)) {
+		char tmp[DEFAULT_BUFFER_SIZE];
+
+		snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%spage size %d too small, "), msg, page_len);
+		strcpy(msg, tmp);
+		result = max_state_alt(STATE_WARNING, result);
+	}
+
+  /* -w, -c: check warning and critical level */
+  result = max_state_alt(get_status(total_time, thlds), result);
+
+  /* Cut-off trailing characters */
+  if (strlen(msg) >= 2) {
+      if(msg[strlen(msg)-2] == ',')
+        msg[strlen(msg)-2] = '\0';
+      else
+        msg[strlen(msg)-3] = '\0';
+    }
+
+  /* TODO: separate _() msg and status code: die (result, "HTTP %s: %s\n", state_text(result), msg); */
+  die (result, "HTTP %s: %s %d %s%s%s - %d bytes in %.3f second response time %s|%s\n%s%s",
+    state_text(result), string_statuscode (status_line.http_major, status_line.http_minor),
+    status_line.http_code, status_line.msg,
+    strlen(msg) > 0 ? " - " : "",
+    msg, page_len, total_time,
+    (display_html ? "</A>" : ""),
+    perfstring,
+    (show_body ? body_buf.buf : ""),
+    (show_body ? "\n" : "") );
+
+  return result;
+}
+
+int
+uri_strcmp (const UriTextRangeA range, const char* s)
+{
+  if (!range.first) return -1;
+  if (range.afterLast - range.first < strlen (s)) return -1;
+  return strncmp (s, range.first, min( range.afterLast - range.first, strlen (s)));
+}
+
+char*
+uri_string (const UriTextRangeA range, char* buf, size_t buflen)
+{
+  if (!range.first) return "(null)";
+  strncpy (buf, range.first, max (buflen-1, range.afterLast - range.first));
+  buf[max (buflen-1, range.afterLast - range.first)] = '\0';
+  buf[range.afterLast - range.first] = '\0';
+  return buf;
+}
+
+void
+redir (curlhelp_write_curlbuf* header_buf)
+{
+  char *location = NULL;
+  curlhelp_statusline status_line;
+  struct phr_header headers[255];
+  size_t nof_headers = 255;
+  size_t msglen;
+  char buf[DEFAULT_BUFFER_SIZE];
+  char ipstr[INET_ADDR_MAX_SIZE];
+  int new_port;
+  char *new_host;
+  char *new_url;
+
+  int res = phr_parse_response (header_buf->buf, header_buf->buflen,
+    &status_line.http_major, &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
+    headers, &nof_headers, 0);
+
+	if (res == -1) {
+		die (STATE_UNKNOWN, _("HTTP UNKNOWN - Failed to parse Response\n"));
+	}
+
+  location = get_header_value (headers, nof_headers, "location");
+
+  if (verbose >= 2)
+    printf(_("* Seen redirect location %s\n"), location);
+
+  if (++redir_depth > max_depth)
+    die (STATE_WARNING,
+         _("HTTP WARNING - maximum redirection depth %d exceeded - %s%s\n"),
+         max_depth, location, (display_html ? "</A>" : ""));
+
+  UriParserStateA state;
+  UriUriA uri;
+  state.uri = &uri;
+  if (uriParseUriA (&state, location) != URI_SUCCESS) {
+    if (state.errorCode == URI_ERROR_SYNTAX) {
+      die (STATE_UNKNOWN,
+           _("HTTP UNKNOWN - Could not parse redirect location '%s'%s\n"),
+           location, (display_html ? "</A>" : ""));
+    } else if (state.errorCode == URI_ERROR_MALLOC) {
+      die (STATE_UNKNOWN, _("HTTP UNKNOWN - Could not allocate URL\n"));
+    }
+  }
+
+  if (verbose >= 2) {
+    printf (_("** scheme: %s\n"),
+      uri_string (uri.scheme, buf, DEFAULT_BUFFER_SIZE));
+    printf (_("** host: %s\n"),
+      uri_string (uri.hostText, buf, DEFAULT_BUFFER_SIZE));
+    printf (_("** port: %s\n"),
+      uri_string (uri.portText, buf, DEFAULT_BUFFER_SIZE));
+    if (uri.hostData.ip4) {
+      inet_ntop (AF_INET, uri.hostData.ip4->data, ipstr, sizeof (ipstr));
+      printf (_("** IPv4: %s\n"), ipstr);
+    }
+    if (uri.hostData.ip6) {
+      inet_ntop (AF_INET, uri.hostData.ip6->data, ipstr, sizeof (ipstr));
+      printf (_("** IPv6: %s\n"), ipstr);
+    }
+    if (uri.pathHead) {
+      printf (_("** path: "));
+      const UriPathSegmentA* p = uri.pathHead;
+      for (; p; p = p->next) {
+        printf ("/%s", uri_string (p->text, buf, DEFAULT_BUFFER_SIZE));
+      }
+      puts ("");
+    }
+    if (uri.query.first) {
+      printf (_("** query: %s\n"),
+      uri_string (uri.query, buf, DEFAULT_BUFFER_SIZE));
+    }
+    if (uri.fragment.first) {
+      printf (_("** fragment: %s\n"),
+      uri_string (uri.fragment, buf, DEFAULT_BUFFER_SIZE));
+    }
+  }
+
+  if (!uri_strcmp (uri.scheme, "https"))
+    use_ssl = true;
+  else
+    use_ssl = false;
+
+  /* we do a sloppy test here only, because uriparser would have failed
+   * above, if the port would be invalid, we just check for MAX_PORT
+   */
+  if (uri.portText.first) {
+    new_port = atoi (uri_string (uri.portText, buf, DEFAULT_BUFFER_SIZE));
+  } else {
+    new_port = HTTP_PORT;
+    if (use_ssl)
+      new_port = HTTPS_PORT;
+  }
+  if (new_port > MAX_PORT)
+    die (STATE_UNKNOWN,
+         _("HTTP UNKNOWN - Redirection to port above %d - %s%s\n"),
+         MAX_PORT, location, display_html ? "</A>" : "");
+
+  /* by RFC 7231 relative URLs in Location should be taken relative to
+   * the original URL, so wy try to form a new absolute URL here
+   */
+  if (!uri.scheme.first && !uri.hostText.first) {
+    new_host = strdup (host_name ? host_name : server_address);
+  } else {
+    new_host = strdup (uri_string (uri.hostText, buf, DEFAULT_BUFFER_SIZE));
+  }
+
+  /* compose new path */
+  /* TODO: handle fragments and query part of URL */
+  new_url = (char *)calloc( 1, DEFAULT_BUFFER_SIZE);
+  if (uri.pathHead) {
+    const UriPathSegmentA* p = uri.pathHead;
+    for (; p; p = p->next) {
+      strncat (new_url, "/", DEFAULT_BUFFER_SIZE);
+      strncat (new_url, uri_string (p->text, buf, DEFAULT_BUFFER_SIZE), DEFAULT_BUFFER_SIZE-1);
+    }
+  }
+
+  if (server_port==new_port &&
+      !strncmp(server_address, new_host, MAX_IPV4_HOSTLENGTH) &&
+      (host_name && !strncmp(host_name, new_host, MAX_IPV4_HOSTLENGTH)) &&
+      !strcmp(server_url, new_url))
+    die (STATE_CRITICAL,
+         _("HTTP CRITICAL - redirection creates an infinite loop - %s://%s:%d%s%s\n"),
+         use_ssl ? "https" : "http", new_host, new_port, new_url, (display_html ? "</A>" : ""));
+
+  /* set new values for redirected request */
+
+  if (!(followsticky & STICKY_HOST)) {
+    free (server_address);
+    server_address = strndup (new_host, MAX_IPV4_HOSTLENGTH);
+  }
+  if (!(followsticky & STICKY_PORT)) {
+    server_port = (unsigned short)new_port;
+  }
+
+  free (host_name);
+  host_name = strndup (new_host, MAX_IPV4_HOSTLENGTH);
+
+  /* reset virtual port */
+  virtual_port = server_port;
+
+  free(new_host);
+  free (server_url);
+  server_url = new_url;
+
+  uriFreeUriMembersA (&uri);
+
+  if (verbose)
+    printf (_("Redirection to %s://%s:%d%s\n"), use_ssl ? "https" : "http",
+            host_name ? host_name : server_address, server_port, server_url);
+
+  /* TODO: the hash component MUST be taken from the original URL and
+   * attached to the URL in Location
+   */
+
+  cleanup ();
+  check_http ();
+}
+
+/* check whether a file exists */
+void
+test_file (char *path)
+{
+  if (access(path, R_OK) == 0)
+    return;
+  usage2 (_("file does not exist or is not readable"), path);
+}
+
+bool
+process_arguments (int argc, char **argv)
+{
+  char *p;
+  int c = 1;
+  char *temp;
+
+  enum {
+    INVERT_REGEX = CHAR_MAX + 1,
+    SNI_OPTION,
+    MAX_REDIRS_OPTION,
+    CONTINUE_AFTER_CHECK_CERT,
+    CA_CERT_OPTION,
+    HTTP_VERSION_OPTION,
+    AUTOMATIC_DECOMPRESSION,
+    COOKIE_JAR
+  };
+
+  int option = 0;
+  int got_plus = 0;
+  static struct option longopts[] = {
+    STD_LONG_OPTS,
+    {"link", no_argument, 0, 'L'},
+    {"nohtml", no_argument, 0, 'n'},
+    {"ssl", optional_argument, 0, 'S'},
+    {"sni", no_argument, 0, SNI_OPTION},
+    {"post", required_argument, 0, 'P'},
+    {"method", required_argument, 0, 'j'},
+    {"IP-address", required_argument, 0, 'I'},
+    {"url", required_argument, 0, 'u'},
+    {"port", required_argument, 0, 'p'},
+    {"authorization", required_argument, 0, 'a'},
+    {"proxy-authorization", required_argument, 0, 'b'},
+    {"header-string", required_argument, 0, 'd'},
+    {"string", required_argument, 0, 's'},
+    {"expect", required_argument, 0, 'e'},
+    {"regex", required_argument, 0, 'r'},
+    {"ereg", required_argument, 0, 'r'},
+    {"eregi", required_argument, 0, 'R'},
+    {"linespan", no_argument, 0, 'l'},
+    {"onredirect", required_argument, 0, 'f'},
+    {"certificate", required_argument, 0, 'C'},
+    {"client-cert", required_argument, 0, 'J'},
+    {"private-key", required_argument, 0, 'K'},
+    {"ca-cert", required_argument, 0, CA_CERT_OPTION},
+    {"verify-cert", no_argument, 0, 'D'},
+    {"continue-after-certificate", no_argument, 0, CONTINUE_AFTER_CHECK_CERT},
+    {"useragent", required_argument, 0, 'A'},
+    {"header", required_argument, 0, 'k'},
+    {"no-body", no_argument, 0, 'N'},
+    {"max-age", required_argument, 0, 'M'},
+    {"content-type", required_argument, 0, 'T'},
+    {"pagesize", required_argument, 0, 'm'},
+    {"invert-regex", no_argument, NULL, INVERT_REGEX},
+    {"use-ipv4", no_argument, 0, '4'},
+    {"use-ipv6", no_argument, 0, '6'},
+    {"extended-perfdata", no_argument, 0, 'E'},
+    {"show-body", no_argument, 0, 'B'},
+    {"max-redirs", required_argument, 0, MAX_REDIRS_OPTION},
+    {"http-version", required_argument, 0, HTTP_VERSION_OPTION},
+    {"enable-automatic-decompression", no_argument, 0, AUTOMATIC_DECOMPRESSION},
+    {"cookie-jar", required_argument, 0, COOKIE_JAR},
+    {0, 0, 0, 0}
+  };
+
+  if (argc < 2)
+    return false;
+
+  /* support check_http compatible arguments */
+  for (c = 1; c < argc; c++) {
+    if (strcmp ("-to", argv[c]) == 0)
+      strcpy (argv[c], "-t");
+    if (strcmp ("-hn", argv[c]) == 0)
+      strcpy (argv[c], "-H");
+    if (strcmp ("-wt", argv[c]) == 0)
+      strcpy (argv[c], "-w");
+    if (strcmp ("-ct", argv[c]) == 0)
+      strcpy (argv[c], "-c");
+    if (strcmp ("-nohtml", argv[c]) == 0)
+      strcpy (argv[c], "-n");
+  }
+
+  server_url = strdup(DEFAULT_SERVER_URL);
+
+  while (1) {
+    c = getopt_long (argc, argv, "Vvh46t:c:w:A:k:H:P:j:T:I:a:b:d:e:p:s:R:r:u:f:C:J:K:DnlLS::m:M:NEB", longopts, &option);
+    if (c == -1 || c == EOF || c == 1)
+      break;
+
+    switch (c) {
+    case 'h':
+      print_help();
+      exit(STATE_UNKNOWN);
+      break;
+    case 'V':
+      print_revision(progname, NP_VERSION);
+      print_curl_version();
+      exit(STATE_UNKNOWN);
+      break;
+    case 'v':
+      verbose++;
+      break;
+    case 't': /* timeout period */
+      if (!is_intnonneg (optarg))
+        usage2 (_("Timeout interval must be a positive integer"), optarg);
+      else
+        socket_timeout = (int)strtol (optarg, NULL, 10);
+      break;
+    case 'c': /* critical time threshold */
+      critical_thresholds = optarg;
+      break;
+    case 'w': /* warning time threshold */
+      warning_thresholds = optarg;
+      break;
+    case 'H': /* virtual host */
+      host_name = strdup (optarg);
+      if (host_name[0] == '[') {
+        if ((p = strstr (host_name, "]:")) != NULL) { /* [IPv6]:port */
+          virtual_port = atoi (p + 2);
+          /* cut off the port */
+          host_name_length = strlen (host_name) - strlen (p) - 1;
+          free (host_name);
+          host_name = strndup (optarg, host_name_length);
+	}
+      } else if ((p = strchr (host_name, ':')) != NULL
+                 && strchr (++p, ':') == NULL) { /* IPv4:port or host:port */
+          virtual_port = atoi (p);
+          /* cut off the port */
+          host_name_length = strlen (host_name) - strlen (p) - 1;
+          free (host_name);
+          host_name = strndup (optarg, host_name_length);
+        }
+      break;
+    case 'I': /* internet address */
+      server_address = strdup (optarg);
+      break;
+    case 'u': /* URL path */
+      server_url = strdup (optarg);
+      break;
+    case 'p': /* Server port */
+      if (!is_intnonneg (optarg))
+        usage2 (_("Invalid port number, expecting a non-negative number"), optarg);
+      else {
+        if( strtol(optarg, NULL, 10) > MAX_PORT)
+          usage2 (_("Invalid port number, supplied port number is too big"), optarg);
+        server_port = (unsigned short)strtol(optarg, NULL, 10);
+        specify_port = true;
+      }
+      break;
+    case 'a': /* authorization info */
+      strncpy (user_auth, optarg, MAX_INPUT_BUFFER - 1);
+      user_auth[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 'b': /* proxy-authorization info */
+      strncpy (proxy_auth, optarg, MAX_INPUT_BUFFER - 1);
+      proxy_auth[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 'P': /* HTTP POST data in URL encoded format; ignored if settings already */
+      if (! http_post_data)
+        http_post_data = strdup (optarg);
+      if (! http_method)
+        http_method = strdup("POST");
+      break;
+    case 'j': /* Set HTTP method */
+      if (http_method)
+        free(http_method);
+      http_method = strdup (optarg);
+      break;
+    case 'A': /* useragent */
+      strncpy (user_agent, optarg, DEFAULT_BUFFER_SIZE);
+      user_agent[DEFAULT_BUFFER_SIZE-1] = '\0';
+      break;
+    case 'k': /* Additional headers */
+      if (http_opt_headers_count == 0)
+        http_opt_headers = malloc (sizeof (char *) * (++http_opt_headers_count));
+      else
+        http_opt_headers = realloc (http_opt_headers, sizeof (char *) * (++http_opt_headers_count));
+      http_opt_headers[http_opt_headers_count - 1] = optarg;
+      break;
+    case 'L': /* show html link */
+      display_html = true;
+      break;
+    case 'n': /* do not show html link */
+      display_html = false;
+      break;
+    case 'C': /* Check SSL cert validity */
+#ifdef LIBCURL_FEATURE_SSL
+      if ((temp=strchr(optarg,','))!=NULL) {
+        *temp='\0';
+        if (!is_intnonneg (optarg))
+          usage2 (_("Invalid certificate expiration period"), optarg);
+        days_till_exp_warn = atoi(optarg);
+        *temp=',';
+        temp++;
+        if (!is_intnonneg (temp))
+          usage2 (_("Invalid certificate expiration period"), temp);
+        days_till_exp_crit = atoi (temp);
+      }
+      else {
+        days_till_exp_crit=0;
+        if (!is_intnonneg (optarg))
+          usage2 (_("Invalid certificate expiration period"), optarg);
+        days_till_exp_warn = atoi (optarg);
+      }
+      check_cert = true;
+      goto enable_ssl;
+#endif
+    case CONTINUE_AFTER_CHECK_CERT: /* don't stop after the certificate is checked */
+#ifdef HAVE_SSL
+      continue_after_check_cert = true;
+      break;
+#endif
+    case 'J': /* use client certificate */
+#ifdef LIBCURL_FEATURE_SSL
+      test_file(optarg);
+      client_cert = optarg;
+      goto enable_ssl;
+#endif
+    case 'K': /* use client private key */
+#ifdef LIBCURL_FEATURE_SSL
+      test_file(optarg);
+      client_privkey = optarg;
+      goto enable_ssl;
+#endif
+#ifdef LIBCURL_FEATURE_SSL
+    case CA_CERT_OPTION: /* use CA chain file */
+      test_file(optarg);
+      ca_cert = optarg;
+      goto enable_ssl;
+#endif
+#ifdef LIBCURL_FEATURE_SSL
+    case 'D': /* verify peer certificate & host */
+      verify_peer_and_host = true;
+      break;
+#endif
+    case 'S': /* use SSL */
+#ifdef LIBCURL_FEATURE_SSL
+    enable_ssl:
+      use_ssl = true;
+      /* ssl_version initialized to CURL_SSLVERSION_DEFAULT as a default.
+       * Only set if it's non-zero.  This helps when we include multiple
+       * parameters, like -S and -C combinations */
+      ssl_version = CURL_SSLVERSION_DEFAULT;
+      if (c=='S' && optarg != NULL) {
+        char *plus_ptr = strchr(optarg, '+');
+        if (plus_ptr) {
+          got_plus = 1;
+          *plus_ptr = '\0';
+        }
+
+        if (optarg[0] == '2')
+          ssl_version = CURL_SSLVERSION_SSLv2;
+        else if (optarg[0] == '3')
+          ssl_version = CURL_SSLVERSION_SSLv3;
+        else if (!strcmp (optarg, "1") || !strcmp (optarg, "1.0"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_0;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        else if (!strcmp (optarg, "1.1"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_1;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        else if (!strcmp (optarg, "1.2"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_2;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 34, 0) */
+        else if (!strcmp (optarg, "1.3"))
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 52, 0)
+          ssl_version = CURL_SSLVERSION_TLSv1_3;
+#else
+          ssl_version = CURL_SSLVERSION_DEFAULT;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 52, 0) */
+        else
+          usage4 (_("Invalid option - Valid SSL/TLS versions: 2, 3, 1, 1.1, 1.2, 1.3 (with optional '+' suffix)"));
+      }
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 54, 0)
+      if (got_plus) {
+        switch (ssl_version) {
+          case CURL_SSLVERSION_TLSv1_3:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_3;
+            break;
+          case CURL_SSLVERSION_TLSv1_2:
+          case CURL_SSLVERSION_TLSv1_1:
+          case CURL_SSLVERSION_TLSv1_0:
+            ssl_version |= CURL_SSLVERSION_MAX_DEFAULT;
+            break;
+        }
+      } else {
+        switch (ssl_version) {
+          case CURL_SSLVERSION_TLSv1_3:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_3;
+            break;
+          case CURL_SSLVERSION_TLSv1_2:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_2;
+            break;
+          case CURL_SSLVERSION_TLSv1_1:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_1;
+            break;
+          case CURL_SSLVERSION_TLSv1_0:
+            ssl_version |= CURL_SSLVERSION_MAX_TLSv1_0;
+            break;
+        }
+      }
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 54, 0) */
+      if (verbose >= 2)
+        printf(_("* Set SSL/TLS version to %d\n"), ssl_version);
+      if (!specify_port)
+        server_port = HTTPS_PORT;
+      break;
+#else /* LIBCURL_FEATURE_SSL */
+      /* -C -J and -K fall through to here without SSL */
+      usage4 (_("Invalid option - SSL is not available"));
+      break;
+    case SNI_OPTION: /* --sni is parsed, but ignored, the default is true with libcurl */
+      use_sni = true;
+      break;
+#endif /* LIBCURL_FEATURE_SSL */
+    case MAX_REDIRS_OPTION:
+      if (!is_intnonneg (optarg))
+        usage2 (_("Invalid max_redirs count"), optarg);
+      else {
+        max_depth = atoi (optarg);
+      }
+      break;
+    case 'f': /* onredirect */
+      if (!strcmp (optarg, "ok"))
+        onredirect = STATE_OK;
+      else if (!strcmp (optarg, "warning"))
+        onredirect = STATE_WARNING;
+      else if (!strcmp (optarg, "critical"))
+        onredirect = STATE_CRITICAL;
+      else if (!strcmp (optarg, "unknown"))
+        onredirect = STATE_UNKNOWN;
+      else if (!strcmp (optarg, "follow"))
+        onredirect = STATE_DEPENDENT;
+      else if (!strcmp (optarg, "stickyport"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_HTTP_CURL, followsticky = STICKY_HOST|STICKY_PORT;
+      else if (!strcmp (optarg, "sticky"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_HTTP_CURL, followsticky = STICKY_HOST;
+      else if (!strcmp (optarg, "follow"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_HTTP_CURL, followsticky = STICKY_NONE;
+      else if (!strcmp (optarg, "curl"))
+        onredirect = STATE_DEPENDENT, followmethod = FOLLOW_LIBCURL;
+      else usage2 (_("Invalid onredirect option"), optarg);
+      if (verbose >= 2)
+        printf(_("* Following redirects set to %s\n"), state_text(onredirect));
+      break;
+    case 'd': /* string or substring */
+      strncpy (header_expect, optarg, MAX_INPUT_BUFFER - 1);
+      header_expect[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 's': /* string or substring */
+      strncpy (string_expect, optarg, MAX_INPUT_BUFFER - 1);
+      string_expect[MAX_INPUT_BUFFER - 1] = 0;
+      break;
+    case 'e': /* string or substring */
+      strncpy (server_expect, optarg, MAX_INPUT_BUFFER - 1);
+      server_expect[MAX_INPUT_BUFFER - 1] = 0;
+      server_expect_yn = 1;
+      break;
+    case 'T': /* Content-type */
+      http_content_type = strdup (optarg);
+     break;
+    case 'l': /* linespan */
+      cflags &= ~REG_NEWLINE;
+      break;
+    case 'R': /* regex */
+      cflags |= REG_ICASE;
+			// fall through
+    case 'r': /* regex */
+      strncpy (regexp, optarg, MAX_RE_SIZE - 1);
+      regexp[MAX_RE_SIZE - 1] = 0;
+      errcode = regcomp (&preg, regexp, cflags);
+      if (errcode != 0) {
+        (void) regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
+        printf (_("Could Not Compile Regular Expression: %s"), errbuf);
+        return false;
+      }
+      break;
+    case INVERT_REGEX:
+      invert_regex = true;
+      break;
+    case '4':
+      address_family = AF_INET;
+      break;
+    case '6':
+#if defined (USE_IPV6) && defined (LIBCURL_FEATURE_IPV6)
+      address_family = AF_INET6;
+#else
+      usage4 (_("IPv6 support not available"));
+#endif
+      break;
+    case 'm': /* min_page_length */
+      {
+      char *tmp;
+      if (strchr(optarg, ':') != (char *)NULL) {
+        /* range, so get two values, min:max */
+        tmp = strtok(optarg, ":");
+        if (tmp == NULL) {
+          printf("Bad format: try \"-m min:max\"\n");
+          exit (STATE_WARNING);
+        } else
+          min_page_len = atoi(tmp);
+
+        tmp = strtok(NULL, ":");
+        if (tmp == NULL) {
+          printf("Bad format: try \"-m min:max\"\n");
+          exit (STATE_WARNING);
+        } else
+          max_page_len = atoi(tmp);
+      } else
+        min_page_len = atoi (optarg);
+      break;
+      }
+    case 'N': /* no-body */
+      no_body = true;
+      break;
+    case 'M': /* max-age */
+    {
+      int L = strlen(optarg);
+      if (L && optarg[L-1] == 'm')
+        maximum_age = atoi (optarg) * 60;
+      else if (L && optarg[L-1] == 'h')
+        maximum_age = atoi (optarg) * 60 * 60;
+      else if (L && optarg[L-1] == 'd')
+        maximum_age = atoi (optarg) * 60 * 60 * 24;
+      else if (L && (optarg[L-1] == 's' ||
+                     isdigit (optarg[L-1])))
+        maximum_age = atoi (optarg);
+      else {
+        fprintf (stderr, "unparsable max-age: %s\n", optarg);
+        exit (STATE_WARNING);
+      }
+      if (verbose >= 2)
+        printf ("* Maximal age of document set to %d seconds\n", maximum_age);
+    }
+    break;
+    case 'E': /* show extended perfdata */
+      show_extended_perfdata = true;
+      break;
+    case 'B': /* print body content after status line */
+      show_body = true;
+      break;
+    case HTTP_VERSION_OPTION:
+      curl_http_version = CURL_HTTP_VERSION_NONE;
+      if (strcmp (optarg, "1.0") == 0) {
+        curl_http_version = CURL_HTTP_VERSION_1_0;
+      } else if (strcmp (optarg, "1.1") == 0) {
+        curl_http_version = CURL_HTTP_VERSION_1_1;
+      } else if ((strcmp (optarg, "2.0") == 0) || (strcmp (optarg, "2") == 0)) {
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 33, 0)
+        curl_http_version = CURL_HTTP_VERSION_2_0;
+#else
+        curl_http_version = CURL_HTTP_VERSION_NONE;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 33, 0) */
+      } else {
+        fprintf (stderr, "unknown http-version parameter: %s\n", optarg);
+        exit (STATE_WARNING);
+      }
+      break;
+    case AUTOMATIC_DECOMPRESSION:
+      automatic_decompression = true;
+      break;
+    case COOKIE_JAR:
+      cookie_jar_file = optarg;
+      break;
+    case '?':
+      /* print short usage statement if args not parsable */
+      usage5 ();
+      break;
+    }
+  }
+
+  c = optind;
+
+  if (server_address == NULL && c < argc)
+    server_address = strdup (argv[c++]);
+
+  if (host_name == NULL && c < argc)
+    host_name = strdup (argv[c++]);
+
+  if (server_address == NULL) {
+    if (host_name == NULL)
+      usage4 (_("You must specify a server address or host name"));
+    else
+      server_address = strdup (host_name);
+  }
+
+  set_thresholds(&thlds, warning_thresholds, critical_thresholds);
+
+  if (critical_thresholds && thlds->critical->end>(double)socket_timeout)
+    socket_timeout = (int)thlds->critical->end + 1;
+  if (verbose >= 2)
+    printf ("* Socket timeout set to %ld seconds\n", socket_timeout);
+
+  if (http_method == NULL)
+    http_method = strdup ("GET");
+
+  if (client_cert && !client_privkey)
+    usage4 (_("If you use a client certificate you must also specify a private key file"));
+
+  if (virtual_port == 0)
+    virtual_port = server_port;
+  else {
+    if ((use_ssl && server_port == HTTPS_PORT) || (!use_ssl && server_port == HTTP_PORT))
+      if(!specify_port)
+        server_port = virtual_port;
+  }
+
+  return true;
+}
+
+char *perfd_time (double elapsed_time)
+{
+  return fperfdata ("time", elapsed_time, "s",
+            thlds->warning?true:false, thlds->warning?thlds->warning->end:0,
+            thlds->critical?true:false, thlds->critical?thlds->critical->end:0,
+                   true, 0, true, socket_timeout);
+}
+
+char *perfd_time_connect (double elapsed_time_connect)
+{
+  return fperfdata ("time_connect", elapsed_time_connect, "s", false, 0, false, 0, false, 0, true, socket_timeout);
+}
+
+char *perfd_time_ssl (double elapsed_time_ssl)
+{
+  return fperfdata ("time_ssl", elapsed_time_ssl, "s", false, 0, false, 0, false, 0, true, socket_timeout);
+}
+
+char *perfd_time_headers (double elapsed_time_headers)
+{
+  return fperfdata ("time_headers", elapsed_time_headers, "s", false, 0, false, 0, false, 0, true, socket_timeout);
+}
+
+char *perfd_time_firstbyte (double elapsed_time_firstbyte)
+{
+  return fperfdata ("time_firstbyte", elapsed_time_firstbyte, "s", false, 0, false, 0, false, 0, true, socket_timeout);
+}
+
+char *perfd_time_transfer (double elapsed_time_transfer)
+{
+  return fperfdata ("time_transfer", elapsed_time_transfer, "s", false, 0, false, 0, false, 0, true, socket_timeout);
+}
+
+char *perfd_size (int page_len)
+{
+  return perfdata ("size", page_len, "B",
+            (min_page_len>0?true:false), min_page_len,
+            (min_page_len>0?true:false), 0,
+            true, 0, false, 0);
+}
+
+void
+print_help (void)
+{
+  print_revision (progname, NP_VERSION);
+
+  printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
+  printf (COPYRIGHT, copyright, email);
+
+  printf ("%s\n", _("This plugin tests the HTTP service on the specified host. It can test"));
+  printf ("%s\n", _("normal (http) and secure (https) servers, follow redirects, search for"));
+  printf ("%s\n", _("strings and regular expressions, check connection times, and report on"));
+  printf ("%s\n", _("certificate expiration times."));
+  printf ("\n");
+  printf ("%s\n", _("It makes use of libcurl to do so. It tries to be as compatible to check_http"));
+  printf ("%s\n", _("as possible."));
+
+  printf ("\n\n");
+
+  print_usage ();
+
+  printf (_("NOTE: One or both of -H and -I must be specified"));
+
+  printf ("\n");
+
+  printf (UT_HELP_VRSN);
+  printf (UT_EXTRA_OPTS);
+
+  printf (" %s\n", "-H, --hostname=ADDRESS");
+  printf ("    %s\n", _("Host name argument for servers using host headers (virtual host)"));
+  printf ("    %s\n", _("Append a port to include it in the header (eg: example.com:5000)"));
+  printf (" %s\n", "-I, --IP-address=ADDRESS");
+  printf ("    %s\n", _("IP address or name (use numeric address if possible to bypass DNS lookup)."));
+  printf (" %s\n", "-p, --port=INTEGER");
+  printf ("    %s", _("Port number (default: "));
+  printf ("%d)\n", HTTP_PORT);
+
+  printf (UT_IPv46);
+
+#ifdef LIBCURL_FEATURE_SSL
+  printf (" %s\n", "-S, --ssl=VERSION[+]");
+  printf ("    %s\n", _("Connect via SSL. Port defaults to 443. VERSION is optional, and prevents"));
+  printf ("    %s\n", _("auto-negotiation (2 = SSLv2, 3 = SSLv3, 1 = TLSv1, 1.1 = TLSv1.1,"));
+  printf ("    %s\n", _("1.2 = TLSv1.2, 1.3 = TLSv1.3). With a '+' suffix, newer versions are also accepted."));
+  printf ("    %s\n", _("Note: SSLv2 and SSLv3 are deprecated and are usually disabled in libcurl"));
+  printf (" %s\n", "--sni");
+  printf ("    %s\n", _("Enable SSL/TLS hostname extension support (SNI)"));
+#if LIBCURL_VERSION_NUM >= 0x071801
+  printf ("    %s\n", _("Note: --sni is the default in libcurl as SSLv2 and SSLV3 are deprecated and"));
+  printf ("    %s\n", _("      SNI only really works since TLSv1.0"));
+#else
+  printf ("    %s\n", _("Note: SNI is not supported in libcurl before 7.18.1"));
+#endif
+  printf (" %s\n", "-C, --certificate=INTEGER[,INTEGER]");
+  printf ("    %s\n", _("Minimum number of days a certificate has to be valid. Port defaults to 443"));
+  printf ("    %s\n", _("(when this option is used the URL is not checked by default. You can use"));
+  printf ("    %s\n", _(" --continue-after-certificate to override this behavior)"));
+  printf (" %s\n", "--continue-after-certificate");
+  printf ("    %s\n", _("Allows the HTTP check to continue after performing the certificate check."));
+  printf ("    %s\n", _("Does nothing unless -C is used."));
+  printf (" %s\n", "-J, --client-cert=FILE");
+  printf ("   %s\n", _("Name of file that contains the client certificate (PEM format)"));
+  printf ("   %s\n", _("to be used in establishing the SSL session"));
+  printf (" %s\n", "-K, --private-key=FILE");
+  printf ("   %s\n", _("Name of file containing the private key (PEM format)"));
+  printf ("   %s\n", _("matching the client certificate"));
+  printf (" %s\n", "--ca-cert=FILE");
+  printf ("   %s\n", _("CA certificate file to verify peer against"));
+  printf (" %s\n", "-D, --verify-cert");
+  printf ("   %s\n", _("Verify the peer's SSL certificate and hostname"));
+#endif
+
+  printf (" %s\n", "-e, --expect=STRING");
+  printf ("    %s\n", _("Comma-delimited list of strings, at least one of them is expected in"));
+  printf ("    %s", _("the first (status) line of the server response (default: "));
+  printf ("%s)\n", HTTP_EXPECT);
+  printf ("    %s\n", _("If specified skips all other status line logic (ex: 3xx, 4xx, 5xx processing)"));
+  printf (" %s\n", "-d, --header-string=STRING");
+  printf ("    %s\n", _("String to expect in the response headers"));
+  printf (" %s\n", "-s, --string=STRING");
+  printf ("    %s\n", _("String to expect in the content"));
+  printf (" %s\n", "-u, --url=PATH");
+  printf ("    %s\n", _("URL to GET or POST (default: /)"));
+  printf (" %s\n", "-P, --post=STRING");
+  printf ("    %s\n", _("URL encoded http POST data"));
+  printf (" %s\n", "-j, --method=STRING  (for example: HEAD, OPTIONS, TRACE, PUT, DELETE, CONNECT)");
+  printf ("    %s\n", _("Set HTTP method."));
+  printf (" %s\n", "-N, --no-body");
+  printf ("    %s\n", _("Don't wait for document body: stop reading after headers."));
+  printf ("    %s\n", _("(Note that this still does an HTTP GET or POST, not a HEAD.)"));
+  printf (" %s\n", "-M, --max-age=SECONDS");
+  printf ("    %s\n", _("Warn if document is more than SECONDS old. the number can also be of"));
+  printf ("    %s\n", _("the form \"10m\" for minutes, \"10h\" for hours, or \"10d\" for days."));
+  printf (" %s\n", "-T, --content-type=STRING");
+  printf ("    %s\n", _("specify Content-Type header media type when POSTing\n"));
+  printf (" %s\n", "-l, --linespan");
+  printf ("    %s\n", _("Allow regex to span newlines (must precede -r or -R)"));
+  printf (" %s\n", "-r, --regex, --ereg=STRING");
+  printf ("    %s\n", _("Search page for regex STRING"));
+  printf (" %s\n", "-R, --eregi=STRING");
+  printf ("    %s\n", _("Search page for case-insensitive regex STRING"));
+  printf (" %s\n", "--invert-regex");
+  printf ("    %s\n", _("Return CRITICAL if found, OK if not\n"));
+  printf (" %s\n", "-a, --authorization=AUTH_PAIR");
+  printf ("    %s\n", _("Username:password on sites with basic authentication"));
+  printf (" %s\n", "-b, --proxy-authorization=AUTH_PAIR");
+  printf ("    %s\n", _("Username:password on proxy-servers with basic authentication"));
+  printf (" %s\n", "-A, --useragent=STRING");
+  printf ("    %s\n", _("String to be sent in http header as \"User Agent\""));
+  printf (" %s\n", "-k, --header=STRING");
+  printf ("    %s\n", _("Any other tags to be sent in http header. Use multiple times for additional headers"));
+  printf (" %s\n", "-E, --extended-perfdata");
+  printf ("    %s\n", _("Print additional performance data"));
+  printf (" %s\n", "-B, --show-body");
+  printf ("    %s\n", _("Print body content below status line"));
+  printf (" %s\n", "-L, --link");
+  printf ("    %s\n", _("Wrap output in HTML link (obsoleted by urlize)"));
+  printf (" %s\n", "-f, --onredirect=<ok|warning|critical|follow|sticky|stickyport|curl>");
+  printf ("    %s\n", _("How to handle redirected pages. sticky is like follow but stick to the"));
+  printf ("    %s\n", _("specified IP address. stickyport also ensures port stays the same."));
+  printf ("    %s\n", _("follow uses the old redirection algorithm of check_http."));
+  printf ("    %s\n", _("curl uses CURL_FOLLOWLOCATION built into libcurl."));
+  printf (" %s\n", "--max-redirs=INTEGER");
+  printf ("    %s", _("Maximal number of redirects (default: "));
+  printf ("%d)\n", DEFAULT_MAX_REDIRS);
+  printf (" %s\n", "-m, --pagesize=INTEGER<:INTEGER>");
+  printf ("    %s\n", _("Minimum page size required (bytes) : Maximum page size required (bytes)"));
+  printf ("\n");
+  printf (" %s\n", "--http-version=VERSION");
+  printf ("    %s\n", _("Connect via specific HTTP protocol."));
+  printf ("    %s\n", _("1.0 = HTTP/1.0, 1.1 = HTTP/1.1, 2.0 = HTTP/2 (HTTP/2 will fail without -S)"));
+  printf (" %s\n", "--enable-automatic-decompression");
+  printf ("    %s\n", _("Enable automatic decompression of body (CURLOPT_ACCEPT_ENCODING)."));
+  printf (" %s\n", "---cookie-jar=FILE");
+  printf ("    %s\n", _("Store cookies in the cookie jar and send them out when requested."));
+  printf ("\n");
+
+  printf (UT_WARN_CRIT);
+
+  printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
+
+  printf (UT_VERBOSE);
+
+  printf ("\n");
+  printf ("%s\n", _("Notes:"));
+  printf (" %s\n", _("This plugin will attempt to open an HTTP connection with the host."));
+  printf (" %s\n", _("Successful connects return STATE_OK, refusals and timeouts return STATE_CRITICAL"));
+  printf (" %s\n", _("other errors return STATE_UNKNOWN.  Successful connects, but incorrect response"));
+  printf (" %s\n", _("messages from the host result in STATE_WARNING return values.  If you are"));
+  printf (" %s\n", _("checking a virtual server that uses 'host headers' you must supply the FQDN"));
+  printf (" %s\n", _("(fully qualified domain name) as the [host_name] argument."));
+
+#ifdef LIBCURL_FEATURE_SSL
+  printf ("\n");
+  printf (" %s\n", _("This plugin can also check whether an SSL enabled web server is able to"));
+  printf (" %s\n", _("serve content (optionally within a specified time) or whether the X509 "));
+  printf (" %s\n", _("certificate is still valid for the specified number of days."));
+  printf ("\n");
+  printf (" %s\n", _("Please note that this plugin does not check if the presented server"));
+  printf (" %s\n", _("certificate matches the hostname of the server, or if the certificate"));
+  printf (" %s\n", _("has a valid chain of trust to one of the locally installed CAs."));
+  printf ("\n");
+  printf ("%s\n", _("Examples:"));
+  printf (" %s\n\n", "CHECK CONTENT: check_curl -w 5 -c 10 --ssl -H www.verisign.com");
+  printf (" %s\n", _("When the 'www.verisign.com' server returns its content within 5 seconds,"));
+  printf (" %s\n", _("a STATE_OK will be returned. When the server returns its content but exceeds"));
+  printf (" %s\n", _("the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,"));
+  printf (" %s\n", _("a STATE_CRITICAL will be returned."));
+  printf ("\n");
+  printf (" %s\n\n", "CHECK CERTIFICATE: check_curl -H www.verisign.com -C 14");
+  printf (" %s\n", _("When the certificate of 'www.verisign.com' is valid for more than 14 days,"));
+  printf (" %s\n", _("a STATE_OK is returned. When the certificate is still valid, but for less than"));
+  printf (" %s\n", _("14 days, a STATE_WARNING is returned. A STATE_CRITICAL will be returned when"));
+  printf (" %s\n\n", _("the certificate is expired."));
+  printf ("\n");
+  printf (" %s\n\n", "CHECK CERTIFICATE: check_curl -H www.verisign.com -C 30,14");
+  printf (" %s\n", _("When the certificate of 'www.verisign.com' is valid for more than 30 days,"));
+  printf (" %s\n", _("a STATE_OK is returned. When the certificate is still valid, but for less than"));
+  printf (" %s\n", _("30 days, but more than 14 days, a STATE_WARNING is returned."));
+  printf (" %s\n", _("A STATE_CRITICAL will be returned when certificate expires in less than 14 days"));
+#endif
+
+  printf ("\n %s\n", "CHECK WEBSERVER CONTENT VIA PROXY:");
+  printf (" %s\n", _("It is recommended to use an environment proxy like:"));
+  printf (" %s\n", _("http_proxy=http://192.168.100.35:3128 ./check_curl -H www.monitoring-plugins.org"));
+  printf (" %s\n", _("legacy proxy requests in check_http style still work:"));
+  printf (" %s\n", _("check_curl -I 192.168.100.35 -p 3128 -u http://www.monitoring-plugins.org/ -H www.monitoring-plugins.org"));
+
+#ifdef LIBCURL_FEATURE_SSL
+  printf ("\n %s\n", "CHECK SSL WEBSERVER CONTENT VIA PROXY USING HTTP 1.1 CONNECT: ");
+  printf (" %s\n", _("It is recommended to use an environment proxy like:"));
+  printf (" %s\n", _("https_proxy=http://192.168.100.35:3128 ./check_curl -H www.verisign.com -S"));
+  printf (" %s\n", _("legacy proxy requests in check_http style still work:"));
+  printf (" %s\n", _("check_curl -I 192.168.100.35 -p 3128 -u https://www.verisign.com/ -S -j CONNECT -H www.verisign.com "));
+  printf (" %s\n", _("all these options are needed: -I <proxy> -p <proxy-port> -u <check-url> -S(sl) -j CONNECT -H <webserver>"));
+  printf (" %s\n", _("a STATE_OK will be returned. When the server returns its content but exceeds"));
+  printf (" %s\n", _("the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,"));
+  printf (" %s\n", _("a STATE_CRITICAL will be returned."));
+
+#endif
+
+  printf (UT_SUPPORT);
+
+}
+
+
+
+void
+print_usage (void)
+{
+  printf ("%s\n", _("Usage:"));
+  printf (" %s -H <vhost> | -I <IP-address> [-u <uri>] [-p <port>]\n",progname);
+  printf ("       [-J <client certificate file>] [-K <private key>] [--ca-cert <CA certificate file>] [-D]\n");
+  printf ("       [-w <warn time>] [-c <critical time>] [-t <timeout>] [-L] [-E] [-a auth]\n");
+  printf ("       [-b proxy_auth] [-f <ok|warning|critical|follow|sticky|stickyport|curl>]\n");
+  printf ("       [-e <expect>] [-d string] [-s string] [-l] [-r <regex> | -R <case-insensitive regex>]\n");
+  printf ("       [-P string] [-m <min_pg_size>:<max_pg_size>] [-4|-6] [-N] [-M <age>]\n");
+  printf ("       [-A string] [-k string] [-S <version>] [--sni]\n");
+  printf ("       [-T <content-type>] [-j method]\n");
+  printf ("       [--http-version=<version>] [--enable-automatic-decompression]\n");
+  printf ("       [--cookie-jar=<cookie jar file>\n");
+  printf (" %s -H <vhost> | -I <IP-address> -C <warn_age>[,<crit_age>]\n",progname);
+  printf ("       [-p <port>] [-t <timeout>] [-4|-6] [--sni]\n");
+  printf ("\n");
+#ifdef LIBCURL_FEATURE_SSL
+  printf ("%s\n", _("In the first form, make an HTTP request."));
+  printf ("%s\n\n", _("In the second form, connect to the server and check the TLS certificate."));
+#endif
+  printf ("%s\n", _("WARNING: check_curl is experimental. Please use"));
+  printf ("%s\n\n", _("check_http if you need a stable version."));
+}
+
+void
+print_curl_version (void)
+{
+  printf( "%s\n", curl_version());
+}
+
+int
+curlhelp_initwritebuffer (curlhelp_write_curlbuf *buf)
+{
+  buf->bufsize = DEFAULT_BUFFER_SIZE;
+  buf->buflen = 0;
+  buf->buf = (char *)malloc ((size_t)buf->bufsize);
+  if (buf->buf == NULL) return -1;
+  return 0;
+}
+
+size_t curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+{
+  curlhelp_write_curlbuf *buf = (curlhelp_write_curlbuf *)stream;
+
+  while (buf->bufsize < buf->buflen + size * nmemb + 1) {
+    buf->bufsize = buf->bufsize * 2;
+    buf->buf = (char *)realloc (buf->buf, buf->bufsize);
+    if (buf->buf == NULL) {
+      fprintf(stderr, "malloc failed (%d) %s\n", errno, strerror(errno));
+      return -1;
+    }
+  }
+
+  memcpy (buf->buf + buf->buflen, buffer, size * nmemb);
+  buf->buflen += size * nmemb;
+  buf->buf[buf->buflen] = '\0';
+
+  return (int)(size * nmemb);
+}
+
+size_t curlhelp_buffer_read_callback(void *buffer, size_t size, size_t nmemb, void *stream)
+{
+  curlhelp_read_curlbuf *buf = (curlhelp_read_curlbuf *)stream;
+
+  size_t n = min (nmemb * size, buf->buflen - buf->pos);
+
+  memcpy (buffer, buf->buf + buf->pos, n);
+  buf->pos += n;
+
+  return (int)n;
+}
+
+void
+curlhelp_freewritebuffer (curlhelp_write_curlbuf *buf)
+{
+  free (buf->buf);
+  buf->buf = NULL;
+}
+
+int
+curlhelp_initreadbuffer (curlhelp_read_curlbuf *buf, const char *data, size_t datalen)
+{
+  buf->buflen = datalen;
+  buf->buf = (char *)malloc ((size_t)buf->buflen);
+  if (buf->buf == NULL) return -1;
+  memcpy (buf->buf, data, datalen);
+  buf->pos = 0;
+  return 0;
+}
+
+void
+curlhelp_freereadbuffer (curlhelp_read_curlbuf *buf)
+{
+  free (buf->buf);
+  buf->buf = NULL;
+}
+
+/* TODO: where to put this, it's actually part of sstrings2 (logically)?
+ */
+const char*
+strrstr2(const char *haystack, const char *needle)
+{
+  int counter;
+  size_t len;
+  const char *prev_pos;
+  const char *pos;
+
+  if (haystack == NULL || needle == NULL)
+    return NULL;
+
+  if (haystack[0] == '\0' || needle[0] == '\0')
+    return NULL;
+
+  counter = 0;
+  prev_pos = NULL;
+  pos = haystack;
+  len = strlen (needle);
+  for (;;) {
+    pos = strstr (pos, needle);
+    if (pos == NULL) {
+      if (counter == 0)
+        return NULL;
+      else
+        return prev_pos;
+    }
+    counter++;
+    prev_pos = pos;
+    pos += len;
+    if (*pos == '\0') return prev_pos;
+  }
+}
+
+int
+curlhelp_parse_statusline (const char *buf, curlhelp_statusline *status_line)
+{
+  char *first_line_end;
+  char *p;
+  size_t first_line_len;
+  char *pp;
+  const char *start;
+  char *first_line_buf;
+
+  /* find last start of a new header */
+  start = strrstr2 (buf, "\r\nHTTP/");
+  if (start != NULL) {
+    start += 2;
+    buf = start;
+  }
+
+  first_line_end = strstr(buf, "\r\n");
+  if (first_line_end == NULL) return -1;
+
+  first_line_len = (size_t)(first_line_end - buf);
+  status_line->first_line = (char *)malloc (first_line_len + 1);
+  if (status_line->first_line == NULL) return -1;
+  memcpy (status_line->first_line, buf, first_line_len);
+  status_line->first_line[first_line_len] = '\0';
+  first_line_buf = strdup( status_line->first_line );
+
+  /* protocol and version: "HTTP/x.x" SP or "HTTP/2" SP */
+
+  p = strtok(first_line_buf, "/");
+  if( p == NULL ) { free( first_line_buf ); return -1; }
+  if( strcmp( p, "HTTP" ) != 0 ) { free( first_line_buf ); return -1; }
+
+  p = strtok( NULL, " " );
+  if( p == NULL ) { free( first_line_buf ); return -1; }
+  if( strchr( p, '.' ) != NULL ) {
+
+    /* HTTP 1.x case */
+    strtok( p, "." );
+    status_line->http_major = (int)strtol( p, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    strtok( NULL, " " );
+    status_line->http_minor = (int)strtol( p, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    p += 4; /* 1.x SP */
+  } else {
+    /* HTTP 2 case */
+    status_line->http_major = (int)strtol( p, &pp, 10 );
+    status_line->http_minor = 0;
+    p += 2; /* 2 SP */
+  }
+
+  /* status code: "404" or "404.1", then SP */
+
+  p = strtok( p, " " );
+  if( p == NULL ) { free( first_line_buf ); return -1; }
+  if( strchr( p, '.' ) != NULL ) {
+    char *ppp;
+    ppp = strtok( p, "." );
+    status_line->http_code = (int)strtol( ppp, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    ppp = strtok( NULL, "" );
+    status_line->http_subcode = (int)strtol( ppp, &pp, 10 );
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    p += 6; /* 400.1 SP */
+  } else {
+    status_line->http_code = (int)strtol( p, &pp, 10 );
+    status_line->http_subcode = -1;
+    if( *pp != '\0' ) { free( first_line_buf ); return -1; }
+    p += 4; /* 400 SP */
+  }
+
+  /* Human readable message: "Not Found" CRLF */
+
+  p = strtok( p, "" );
+  if( p == NULL ) { status_line->msg = ""; return 0; }
+  status_line->msg = status_line->first_line + ( p - first_line_buf );
+  free( first_line_buf );
+
+  return 0;
+}
+
+void
+curlhelp_free_statusline (curlhelp_statusline *status_line)
+{
+  free (status_line->first_line);
+}
+
+void
+remove_newlines (char *s)
+{
+  char *p;
+
+  for (p = s; *p != '\0'; p++)
+    if (*p == '\r' || *p == '\n')
+      *p = ' ';
+}
+
+char *
+get_header_value (const struct phr_header* headers, const size_t nof_headers, const char* header)
+{
+  int i;
+  for( i = 0; i < nof_headers; i++ ) {
+    if(headers[i].name != NULL && strncasecmp( header, headers[i].name, max( headers[i].name_len, 4 ) ) == 0 ) {
+      return strndup( headers[i].value, headers[i].value_len );
+    }
+  }
+  return NULL;
+}
+
+int
+check_document_dates (const curlhelp_write_curlbuf *header_buf, char (*msg)[DEFAULT_BUFFER_SIZE])
+{
+  char *server_date = NULL;
+  char *document_date = NULL;
+  int date_result = STATE_OK;
+  curlhelp_statusline status_line;
+  struct phr_header headers[255];
+  size_t nof_headers = 255;
+  size_t msglen;
+
+  int res = phr_parse_response (header_buf->buf, header_buf->buflen,
+    &status_line.http_major, &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
+    headers, &nof_headers, 0);
+
+	if (res == -1) {
+		die (STATE_UNKNOWN, _("HTTP UNKNOWN - Failed to parse Response\n"));
+	}
+
+  server_date = get_header_value (headers, nof_headers, "date");
+  document_date = get_header_value (headers, nof_headers, "last-modified");
+
+	if (!server_date || !*server_date) {
+		char tmp[DEFAULT_BUFFER_SIZE];
+
+		snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sServer date unknown, "), *msg);
+		strcpy(*msg, tmp);
+
+		date_result = max_state_alt(STATE_UNKNOWN, date_result);
+
+	} else if (!document_date || !*document_date) {
+		char tmp[DEFAULT_BUFFER_SIZE];
+
+		snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sDocument modification date unknown, "), *msg);
+		strcpy(*msg, tmp);
+
+		date_result = max_state_alt(STATE_CRITICAL, date_result);
+
+  } else {
+    time_t srv_data = curl_getdate (server_date, NULL);
+    time_t doc_data = curl_getdate (document_date, NULL);
+    if (verbose >= 2)
+      printf ("* server date: '%s' (%d), doc_date: '%s' (%d)\n", server_date, (int)srv_data, document_date, (int)doc_data);
+		if (srv_data <= 0) {
+			char tmp[DEFAULT_BUFFER_SIZE];
+
+			snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sServer date \"%100s\" unparsable, "), *msg, server_date);
+			strcpy(*msg, tmp);
+
+			date_result = max_state_alt(STATE_CRITICAL, date_result);
+		} else if (doc_data <= 0) {
+			char tmp[DEFAULT_BUFFER_SIZE];
+
+			snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sDocument date \"%100s\" unparsable, "), *msg, document_date);
+			strcpy(*msg, tmp);
+
+			date_result = max_state_alt(STATE_CRITICAL, date_result);
+		} else if (doc_data > srv_data + 30) {
+			char tmp[DEFAULT_BUFFER_SIZE];
+
+			snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sDocument is %d seconds in the future, "), *msg, (int)doc_data - (int)srv_data);
+			strcpy(*msg, tmp);
+
+			date_result = max_state_alt(STATE_CRITICAL, date_result);
+		} else if (doc_data < srv_data - maximum_age) {
+			int n = (srv_data - doc_data);
+			if (n > (60 * 60 * 24 * 2)) {
+				char tmp[DEFAULT_BUFFER_SIZE];
+
+				snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sLast modified %.1f days ago, "), *msg, ((float) n) / (60 * 60 * 24));
+			strcpy(*msg, tmp);
+
+				date_result = max_state_alt(STATE_CRITICAL, date_result);
+			} else {
+				char tmp[DEFAULT_BUFFER_SIZE];
+
+				snprintf (tmp, DEFAULT_BUFFER_SIZE, _("%sLast modified %d:%02d:%02d ago, "), *msg, n / (60 * 60), (n / 60) % 60, n % 60);
+				strcpy(*msg, tmp);
+
+				date_result = max_state_alt(STATE_CRITICAL, date_result);
+			}
+		}
+	}
+
+  if (server_date) free (server_date);
+  if (document_date) free (document_date);
+
+  return date_result;
+}
+
+
+int
+get_content_length (const curlhelp_write_curlbuf* header_buf, const curlhelp_write_curlbuf* body_buf)
+{
+  int content_length = 0;
+  struct phr_header headers[255];
+  size_t nof_headers = 255;
+  size_t msglen;
+  char *content_length_s = NULL;
+  curlhelp_statusline status_line;
+
+  int res = phr_parse_response (header_buf->buf, header_buf->buflen,
+    &status_line.http_major, &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
+    headers, &nof_headers, 0);
+
+	if (res == -1) {
+		die (STATE_UNKNOWN, _("HTTP UNKNOWN - Failed to parse Response\n"));
+	}
+
+  content_length_s = get_header_value (headers, nof_headers, "content-length");
+  if (!content_length_s) {
+    return header_buf->buflen + body_buf->buflen;
+  }
+  content_length_s += strspn (content_length_s, " \t");
+  content_length = atoi (content_length_s);
+  if (content_length != body_buf->buflen) {
+    /* TODO: should we warn if the actual and the reported body length don't match? */
+  }
+
+  if (content_length_s) free (content_length_s);
+
+  return header_buf->buflen + body_buf->buflen;
+}
+
+/* TODO: is there a better way in libcurl to check for the SSL library? */
+curlhelp_ssl_library
+curlhelp_get_ssl_library ()
+{
+  curl_version_info_data* version_data;
+  char *ssl_version;
+  char *library;
+  curlhelp_ssl_library ssl_library = CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  version_data = curl_version_info (CURLVERSION_NOW);
+  if (version_data == NULL) return CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  ssl_version = strdup (version_data->ssl_version);
+  if (ssl_version == NULL ) return CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  library = strtok (ssl_version, "/");
+  if (library == NULL) return CURLHELP_SSL_LIBRARY_UNKNOWN;
+
+  if (strcmp (library, "OpenSSL") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_OPENSSL;
+  else if (strcmp (library, "LibreSSL") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_LIBRESSL;
+  else if (strcmp (library, "GnuTLS") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_GNUTLS;
+  else if (strcmp (library, "NSS") == 0)
+    ssl_library = CURLHELP_SSL_LIBRARY_NSS;
+
+  if (verbose >= 2)
+    printf ("* SSL library string is : %s %s (%d)\n", version_data->ssl_version, library, ssl_library);
+
+  free (ssl_version);
+
+  return ssl_library;
+}
+
+const char*
+curlhelp_get_ssl_library_string (curlhelp_ssl_library ssl_library)
+{
+  switch (ssl_library) {
+    case CURLHELP_SSL_LIBRARY_OPENSSL:
+      return "OpenSSL";
+    case CURLHELP_SSL_LIBRARY_LIBRESSL:
+      return "LibreSSL";
+    case CURLHELP_SSL_LIBRARY_GNUTLS:
+      return "GnuTLS";
+    case CURLHELP_SSL_LIBRARY_NSS:
+      return "NSS";
+    case CURLHELP_SSL_LIBRARY_UNKNOWN:
+    default:
+      return "unknown";
+  }
+}
+
+#ifdef LIBCURL_FEATURE_SSL
+#ifndef USE_OPENSSL
+time_t
+parse_cert_date (const char *s)
+{
+  struct tm tm;
+  time_t date;
+  char *res;
+
+  if (!s) return -1;
+
+  /* Jan 17 14:25:12 2020 GMT */
+  res = strptime (s, "%Y-%m-%d %H:%M:%S GMT", &tm);
+  /* Sep 11 12:00:00 2020 GMT */
+  if (res == NULL) strptime (s, "%Y %m %d %H:%M:%S GMT", &tm);
+  date = mktime (&tm);
+
+  return date;
+}
+
+/* TODO: this needs cleanup in the sslutils.c, maybe we the #else case to
+ * OpenSSL could be this function
+ */
+int
+net_noopenssl_check_certificate (cert_ptr_union* cert_ptr, int days_till_exp_warn, int days_till_exp_crit)
+{
+  int i;
+  struct curl_slist* slist;
+  int cname_found = 0;
+  char* start_date_str = NULL;
+  char* end_date_str = NULL;
+  time_t start_date;
+  time_t end_date;
+	char *tz;
+	float time_left;
+	int days_left;
+	int time_remaining;
+	char timestamp[50] = "";
+	int status = STATE_UNKNOWN;
+
+  if (verbose >= 2)
+    printf ("**** REQUEST CERTIFICATES ****\n");
+
+  for (i = 0; i < cert_ptr->to_certinfo->num_of_certs; i++) {
+    for (slist = cert_ptr->to_certinfo->certinfo[i]; slist; slist = slist->next) {
+      /* find first common name in subject,
+       * TODO: check alternative subjects for
+       * TODO: have a decent parser here and not a hack
+       * multi-host certificate, check wildcards
+       */
+      if (strncasecmp (slist->data, "Subject:", 8) == 0) {
+        int d = 3;
+        char* p = strstr (slist->data, "CN=");
+        if (p == NULL) {
+          d = 5;
+          p = strstr (slist->data, "CN = ");
+        }
+        if (p != NULL) {
+          if (strncmp (host_name, p+d, strlen (host_name)) == 0) {
+            cname_found = 1;
+          }
+        }
+      } else if (strncasecmp (slist->data, "Start Date:", 11) == 0) {
+        start_date_str = &slist->data[11];
+      } else if (strncasecmp (slist->data, "Expire Date:", 12) == 0) {
+        end_date_str = &slist->data[12];
+      } else if (strncasecmp (slist->data, "Cert:", 5) == 0) {
+        goto HAVE_FIRST_CERT;
+      }
+      if (verbose >= 2)
+        printf ("%d ** %s\n", i, slist->data);
+    }
+  }
+HAVE_FIRST_CERT:
+
+  if (verbose >= 2)
+    printf ("**** REQUEST CERTIFICATES ****\n");
+
+  if (!cname_found) {
+		printf("%s\n",_("CRITICAL - Cannot retrieve certificate subject."));
+		return STATE_CRITICAL;
+  }
+
+  start_date = parse_cert_date (start_date_str);
+  if (start_date <= 0) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("WARNING - Unparsable 'Start Date' in certificate: '%s'"),
+      start_date_str);
+    puts (msg);
+    return STATE_WARNING;
+  }
+
+  end_date = parse_cert_date (end_date_str);
+  if (end_date <= 0) {
+    snprintf (msg, DEFAULT_BUFFER_SIZE, _("WARNING - Unparsable 'Expire Date' in certificate: '%s'"),
+      start_date_str);
+    puts (msg);
+    return STATE_WARNING;
+  }
+
+  time_left = difftime (end_date, time(NULL));
+	days_left = time_left / 86400;
+	tz = getenv("TZ");
+	setenv("TZ", "GMT", 1);
+	tzset();
+	strftime(timestamp, 50, "%c %z", localtime(&end_date));
+	if (tz)
+		setenv("TZ", tz, 1);
+	else
+		unsetenv("TZ");
+	tzset();
+
+	if (days_left > 0 && days_left <= days_till_exp_warn) {
+		printf (_("%s - Certificate '%s' expires in %d day(s) (%s).\n"), (days_left>days_till_exp_crit)?"WARNING":"CRITICAL", host_name, days_left, timestamp);
+		if (days_left > days_till_exp_crit)
+			status = STATE_WARNING;
+		else
+			status = STATE_CRITICAL;
+	} else if (days_left == 0 && time_left > 0) {
+		if (time_left >= 3600)
+			time_remaining = (int) time_left / 3600;
+		else
+			time_remaining = (int) time_left / 60;
+
+		printf (_("%s - Certificate '%s' expires in %u %s (%s)\n"),
+			(days_left>days_till_exp_crit) ? "WARNING" : "CRITICAL", host_name, time_remaining,
+			time_left >= 3600 ? "hours" : "minutes", timestamp);
+
+		if ( days_left > days_till_exp_crit)
+			status = STATE_WARNING;
+		else
+			status = STATE_CRITICAL;
+	} else if (time_left < 0) {
+		printf(_("CRITICAL - Certificate '%s' expired on %s.\n"), host_name, timestamp);
+		status=STATE_CRITICAL;
+	} else if (days_left == 0) {
+		printf (_("%s - Certificate '%s' just expired (%s).\n"), (days_left>days_till_exp_crit)?"WARNING":"CRITICAL", host_name, timestamp);
+		if (days_left > days_till_exp_crit)
+			status = STATE_WARNING;
+		else
+			status = STATE_CRITICAL;
+	} else {
+		printf(_("OK - Certificate '%s' will expire on %s.\n"), host_name, timestamp);
+		status = STATE_OK;
+	}
+	return status;
+}
+#endif /* USE_OPENSSL */
+#endif /* LIBCURL_FEATURE_SSL */