hydra-http-form.c

/*

Hydra Form Module
-----------------

The hydra form can be used to carry out a brute-force attack on simple
web-based login forms that require username and password variables via
either a GET or POST request.

The module works similarly to the HTTP basic auth module and will honour
proxy mode (with authenticaion) as well as SSL. The module can be invoked
with the service names of "http-get-form", "http-post-form",
"https-get-form" and "https-post-form".

Here's a couple of examples: -

./hydra -l "<userID>" -P pass.txt 10.221.64.12 http-post-form
"/irmlab2/testsso-auth.do:ID=^USER^&Password=^PASS^:Invalid Password"

./hydra -S -s 443 -l "<username>" -P pass.txt 10.221.64.2 https-get-form
"/irmlab1/vulnapp.php:username=^USER^&pass=^PASS^:incorrect"

The option field (following the service field) takes three ":" separated
values and an optional fourth value, the first is the page on the server
to GET or POST to, the second is the POST/GET variables (taken from either
the browser, or a proxy such as PAROS) with the varying usernames and passwords
in the "^USER^" and "^PASS^" placeholders, the third is the string that it
checks for an *invalid* or *valid* login - any exception to this is counted
as a success.
So please:
 * invalid condition login should be preceded by "F="
 * valid condition login should be preceded by "S=".
By default, if no header is found the condition is assume to be a fail,
so checking for *invalid* login.
The fourth optional value, can be a 'C' to define a different page to GET
initial cookies from.

If you specify the verbose flag (-v) it will show you the response from the
HTTP server which is useful for checking the result of a failed login to
find something to pattern match against.

Module initially written by Phil Robinson, IRM Plc (releases@irmplc.com),
rewritten by David Maciejak

Fix and issue with strtok use and implement 1 step location follow if HTTP
3xx code is returned (david dot maciejak at gmail dot com)

Added fail or success condition, getting cookies, and allow 5 redirections by david

*/

#include "hydra-mod.h"

/*	HTTP Header Types	*/
#define HEADER_TYPE_USERHEADER                  'h'
#define HEADER_TYPE_USERHEADER_REPL             'H'
#define HEADER_TYPE_DEFAULT                     'D'
#define HEADER_TYPE_DEFAULT_REPL                'd'

extern char *HYDRA_EXIT;
char *buf;
char *cond;

typedef struct header_node {
  char *header;
  char *value;
  char type;
  struct header_node *next;
} t_header_node, *ptr_header_node;

typedef struct cookie_node {
	char *name;
	char *value;
	struct cookie_node *prev;
	struct cookie_node *next;
} t_cookie_node, *ptr_cookie_node;

int32_t success_cond = 0;
int32_t getcookie = 1;
int32_t auth_flag = 0;

char cookie[4096] = "", cmiscptr[1024];

extern char *webtarget;
extern char *slash;
int32_t webport, freemischttpform = 0;
char bufferurl[6096+24], cookieurl[6096+24] = "", userheader[6096+24] = "", *url, *variables, *optional1;

#define MAX_REDIRECT 				8
#define MAX_CONTENT_LENGTH	20
#define MAX_PROXY_LENGTH		2048    // sizeof(cookieurl) * 2

char redirected_url_buff[2048] = "";
int32_t redirected_flag = 0;
int32_t redirected_cpt = MAX_REDIRECT;

char *cookie_request, *normal_request;  // Buffers for HTTP headers

/*
 * Function to perform some initial setup.
 */
ptr_header_node initialize(char *ip, unsigned char options, char *miscptr);

/*
 * Returns 1 if specified header exists, or 0 otherwise.
 */
ptr_header_node header_exists(ptr_header_node * ptr_head, char *header_name, char type) {
  ptr_header_node cur_ptr = *ptr_head, found_header = NULL;

  for (cur_ptr = *ptr_head; cur_ptr && !found_header; cur_ptr = cur_ptr->next)
    if (cur_ptr->header && strcmp(cur_ptr->header, header_name) == 0 && cur_ptr->type == type)
      found_header = cur_ptr;

  return found_header;
}

#if defined(__sun)
/* Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu> */
char *
strndup (const char *s, size_t n)
{
  char *result;
  size_t len = strlen (s);

  if (n < len)
    len = n;

  result = (char *) malloc (len + 1);
  if (!result)
    return 0;

  memcpy (result, s, len);
  result[len] = '\0';
  return(result);
}
#endif

int32_t append_cookie(char *name, char *value, ptr_cookie_node *last_cookie)
{
	ptr_cookie_node new_ptr = (ptr_cookie_node) malloc(sizeof(t_cookie_node));
	if (!new_ptr)
		return 0;
	new_ptr->name = name;
	new_ptr->value = value;
	new_ptr->next = NULL;
	new_ptr->prev = NULL;
	
	if (*last_cookie == NULL)
		*last_cookie = new_ptr;
	else
		(*last_cookie)->next = new_ptr;
	
	return 1;
}

char * stringify_cookies(ptr_cookie_node ptr_cookie)
{
	ptr_cookie_node cur_ptr = NULL;
	uint32_t length = 1;
	char *cookie_hdr = (char *) malloc(length);

	if (cookie_hdr) {
		memset(cookie_hdr, 0, length);
		for (cur_ptr = ptr_cookie; cur_ptr; cur_ptr = cur_ptr->next) {
			length += 2 + strlen(cur_ptr->name) + strlen(cur_ptr->value);
			cookie_hdr = (char *) realloc(cookie_hdr, length);
			if (cookie_hdr) {
				strcat(cookie_hdr, cur_ptr->name);
				strcat(cookie_hdr, "=");
				strcat(cookie_hdr, cur_ptr->value);
				if (cur_ptr->next)
					strcat(cookie_hdr, ";");
			} else
					goto bail;
		}
		goto success;
	}

bail:
	if (cookie_hdr) {
		free(cookie_hdr);
		cookie_hdr = NULL;
	}

success:
	return cookie_hdr;
}

/*
 * Cookie list layout:
 * 	+----------+     +--------+     +------+
 * 	| ptr_head | --> | next   | --> | NULL |
 * 	+----------+     | header |     +------+
 * 	                 | value  |
 * 	                 +--------+
 * Returns 1 if success, or 0 otherwise.
 */
int32_t add_or_update_cookie(ptr_cookie_node * ptr_cookie, char * cookie_expr)
{
	ptr_cookie_node cur_ptr = NULL;
	char * cookie_name = NULL,
			* cookie_value = strstr(cookie_expr, "=");
	if (cookie_value) {
		cookie_name = strndup(cookie_expr, cookie_value - cookie_expr);
		cookie_value = strdup(cookie_value + 1);
		
		// we've got the cookie's name and value, now it's time to insert or update the list
		if (*ptr_cookie == NULL) {
			// no cookies
			append_cookie(cookie_name, cookie_value, ptr_cookie);
		} else {
			for (cur_ptr = *ptr_cookie; cur_ptr; cur_ptr = cur_ptr->next) {
				if (strcmp(cur_ptr->name, cookie_name) == 0) {
					free(cur_ptr->value);
					cur_ptr->value = cookie_value;
					break;
				}
				if (cur_ptr->next == NULL) {
					append_cookie(cookie_name, cookie_value, &cur_ptr);
					break;
				}
			}
		}
	} else
		return 0;
	return 1;
}

int32_t process_cookies(ptr_cookie_node * ptr_cookie, char * cookie_expr)
{
	char *tok = NULL;
	char *expr = strdup(cookie_expr);
	int32_t res = 0;

	if (strstr(cookie_expr, ";")) {
		tok = strtok(expr, ";");
		while (tok) {
			res = add_or_update_cookie(ptr_cookie, tok);
			if (!res)
				return res;
			tok = strtok(NULL, ";");
		}
		return res;
	} else {
		return add_or_update_cookie(ptr_cookie, expr);
	}
}

/*
 * List layout:
 * 	+----------+     +--------+     +--------+     +--------+
 * 	| ptr_head | --> |  next  | --> |  next  | --> |  NULL  |
 * 	|          |     | header |     | header |     |  NULL  |
 * 	|          |     | value  |     |  value |     |  NULL  |
 * 	+----------+     +--------+     +--------+     +--------+
 *
 * 	Returns 1 if success, or 0 otherwise (out of memory).
 */
int32_t add_header(ptr_header_node * ptr_head, char *header, char *value, char type) {
  ptr_header_node cur_ptr = NULL;
  ptr_header_node existing_hdr, new_ptr;

  // get to the last header
  for (cur_ptr = *ptr_head; cur_ptr && cur_ptr->next; cur_ptr = cur_ptr->next);

  char *new_header = strdup(header);
  char *new_value = strdup(value);

  if (new_header && new_value) {
    if ((type == HEADER_TYPE_USERHEADER) ||
        (type == HEADER_TYPE_DEFAULT && !header_exists(ptr_head, new_header, HEADER_TYPE_USERHEADER_REPL)) ||
        (type == HEADER_TYPE_USERHEADER_REPL && !header_exists(ptr_head, new_header, HEADER_TYPE_DEFAULT)) ||
        (type == HEADER_TYPE_DEFAULT_REPL && !header_exists(ptr_head, new_header, HEADER_TYPE_DEFAULT))
       ) {
      /*
       * We are in one of the following scenarios:
       *      1. A default header with no user-supplied headers that replace it.
       *      2. A user-supplied header that must be appended (option 'h').
       *      3. A user-supplied header that must replace a default header (option 'h'),
       *      but no default headers exist with that name.
       *
       * In either case we just add the header to the list.
       */
      new_ptr = (ptr_header_node) malloc(sizeof(t_header_node));
      if (!new_ptr)
        return 0;
      new_ptr->header = new_header;
      new_ptr->value = new_value;
      new_ptr->type = type;
      new_ptr->next = NULL;

      if (cur_ptr)
        cur_ptr->next = new_ptr;
      else {
        // head is NULL, so the list is empty
        *ptr_head = new_ptr;
      }
    } else if ((type == HEADER_TYPE_DEFAULT_REPL || type == HEADER_TYPE_USERHEADER_REPL) && (existing_hdr = header_exists(ptr_head, new_header, HEADER_TYPE_DEFAULT)) != NULL) {
      // It's a user-supplied header that must replace a default one
      // Replace the default header's value with this new value
      free(existing_hdr->value);
      existing_hdr->value = new_value;
      existing_hdr->type = type;
    }
  } else {
    // we're out of memory, so forcefully end
    return 0;
  }

  return 1;
}

/*
 * Replace in all headers' values every occurrence of oldvalue by newvalue.
 * Only user-defined headers are considered.
 */
void hdrrep(ptr_header_node * ptr_head, char *oldvalue, char *newvalue) {
  ptr_header_node cur_ptr = NULL;

  for (cur_ptr = *ptr_head; cur_ptr; cur_ptr = cur_ptr->next) {
    if ((cur_ptr->type == HEADER_TYPE_USERHEADER || cur_ptr->type == HEADER_TYPE_USERHEADER_REPL) && strstr(cur_ptr->value, oldvalue)) {
      cur_ptr->value = (char *) realloc(cur_ptr->value, strlen(newvalue) + 1);
      if (cur_ptr->value)
        strcpy(cur_ptr->value, newvalue);
      else {
        hydra_report(stderr, "[ERROR] Out of memory (hddrep).");
        hydra_child_exit(0);
      }
    }
  }
}

/*
 * Replace the value of the default header named 'hdrname'.
 */
void hdrrepv(ptr_header_node * ptr_head, char *hdrname, char *new_value) {
  ptr_header_node cur_ptr = NULL;

  for (cur_ptr = *ptr_head; cur_ptr; cur_ptr = cur_ptr->next) {
    if ((cur_ptr->type == HEADER_TYPE_DEFAULT) && strcmp(cur_ptr->header, hdrname) == 0) {
      cur_ptr->value = (char *) realloc(cur_ptr->value, strlen(new_value) + 1);
      if (cur_ptr->value)
        strcpy(cur_ptr->value, new_value);
      else {
        hydra_report(stderr, "[ERROR] Out of memory (hdrrepv %lu)", strlen(new_value) + 1);
        hydra_child_exit(0);
      }
    }
  }
}

void cleanup(ptr_header_node *ptr_head) {
  ptr_header_node cur_ptr = *ptr_head, next_ptr = cur_ptr;

  while (next_ptr != NULL) {
    free(cur_ptr->header);
    free(cur_ptr->value);
    next_ptr = cur_ptr->next;
  }

  *ptr_head = NULL;
}

/*
 * Concat all the headers in the list in a single string.
 * Leave the list itself intact: do not clean it here.
 */
char *stringify_headers(ptr_header_node * ptr_head) {
  char *headers_str = NULL;
  ptr_header_node cur_ptr = *ptr_head;
  int32_t ttl_size = 0;

  for (; cur_ptr; cur_ptr = cur_ptr->next)
    ttl_size += strlen(cur_ptr->header) + strlen(cur_ptr->value) + 4;

  headers_str = (char *) malloc(ttl_size + 1);

  if (headers_str) {
    memset(headers_str, 0, ttl_size + 1);
    for (cur_ptr = *ptr_head; cur_ptr; cur_ptr = cur_ptr->next) {
      strcat(headers_str, cur_ptr->header);
      strcat(headers_str, ": ");
      strcat(headers_str, cur_ptr->value);
      strcat(headers_str, "\r\n");
    }
  }

  return headers_str;
}


char *prepare_http_request(char *type, char *path, char *params, char *headers) {
  uint32_t reqlen = 0;
  char *http_request = NULL;

  if (type && path && headers) {
    reqlen = strlen(path) + strlen(headers) + 20;
    if (params)
      reqlen += strlen(params);

    http_request = (char *) malloc(reqlen);
    if (http_request) {
      memset(http_request, 0, reqlen);

      // append the request verb (GET or POST)
      if (strcmp(type, "GET") == 0)
        strcat(http_request, "GET ");
      else
        strcat(http_request, "POST ");

      // append the request path
      strcat(http_request, path);

      // if GET, append the params now
      if (params && strcmp(type, "GET") == 0) {
        strcat(http_request, "?");
        strcat(http_request, params);
      }
      // append the headers
      strcat(http_request, " HTTP/1.0\r\n");
      strcat(http_request, headers);
      strcat(http_request, "\r\n");

      // if POST, append the params now
      if (params && strcmp(type, "POST") == 0)
        strcat(http_request, params);
    }
  }

  return http_request;
}

int32_t strpos(char *str, char *target) {
  char *res = strstr(str, target);

  if (res == NULL)
    return -1;
  else
    return res - str;
}

char *html_encode(char *string) {
  char *ret = string;

  if (ret == NULL)
    return NULL;

  if (index(ret, '%') != NULL)
    ret = hydra_strrep(ret, "%", "%25");
  if (index(ret, ' ') != NULL)
    ret = hydra_strrep(ret, " ", "%20");
  if (index(ret, '&') != NULL)
    ret = hydra_strrep(ret, "&", "%26");
  if (index(ret, '#') != NULL)
    ret = hydra_strrep(ret, "#", "%23");
  if (index(ret, '=') != NULL)
    ret = hydra_strrep(ret, "=", "%3D");

  return ret;
}


/*
int32_t analyze_server_response(int32_t socket)
return 0 or 1 when the cond regex is matched
return -1 if no response from server
*/
int32_t analyze_server_response(int32_t s) {
  int32_t runs = 0;
  redirected_flag = 0;
  auth_flag = 0;
  while ((buf = hydra_receive_line(s)) != NULL) {
    runs++;
    //check for http redirection
    if (strstr(buf, "HTTP/1.1 3") != NULL || strstr(buf, "HTTP/1.0 3") != NULL || strstr(buf, "Status: 3") != NULL) {
      redirected_flag = 1;
    } else if (strstr(buf, "HTTP/1.1 401") != NULL || strstr(buf, "HTTP/1.0 401") != NULL) {
      auth_flag = 1;
    } else if ((strstr(buf, "HTTP/1.1 403") != NULL) || (strstr(buf, "HTTP/1.1 404") != NULL) || (strstr(buf, "HTTP/1.0 403") != NULL) || (strstr(buf, "HTTP/1.0 404") != NULL)) {
      return 0;
    }

    if (hydra_strcasestr(buf, "Location: ") != NULL) {
      char *startloc, *endloc;
      char str[2048];

      startloc = hydra_strcasestr(buf, "Location: ") + strlen("Location: ");
      strncpy(str, startloc, sizeof(str) - 1);
      str[sizeof(str) - 1] = 0;
      endloc = strchr(str, '\n');
      if (endloc != NULL)
        *endloc = 0;
      endloc = strchr(str, '\r');
      if (endloc != NULL)
        *endloc = 0;
      strcpy(redirected_url_buff, str);
    }
    //there can be multiple cookies
    if (hydra_strcasestr(buf, "Set-Cookie: ") != NULL) {
      char *cookiebuf = buf;

      do {
        char *startcookie, *endcookie1, *endcookie2;
        char str[1024], tmpcookie[4096] = "", tmpname[128] = "", *ptr, *ptr2;

        memset(str, 0, sizeof(str));
        startcookie = hydra_strcasestr(cookiebuf, "Set-Cookie: ") + strlen("Set-Cookie: ");
        strncpy(str, startcookie, sizeof(str) - 1);
        str[sizeof(str) - 1] = 0;
        endcookie1 = strchr(str, '\n');
        endcookie2 = strchr(str, ';');
        //terminate string after cookie data
        if (endcookie1 != NULL && ((endcookie1 < endcookie2) || (endcookie2 == NULL))) {
          if (*(endcookie1 - 1) == '\r')
            endcookie1--;
          *endcookie1 = 0;
        } else if (endcookie2 != NULL)
          *endcookie2 = 0;
        // is the cookie already there? if yes, remove it!
        if (index(startcookie, '=') != NULL && (ptr = index(startcookie, '=')) - startcookie + 1 <= sizeof(tmpname)) {
          strncpy(tmpname, startcookie, sizeof(tmpname) - 2);
          tmpname[sizeof(tmpname) - 2] = 0;
          ptr = index(tmpname, '=');
          *(++ptr) = 0;
          // is the cookie already in the cookiejar? (so, does it have to be replaced?)
          if ((ptr = hydra_strcasestr(cookie, tmpname)) != NULL) {
            // yes it is.
            // if the cookie is not in the beginning of the cookiejar, copy the ones before
            if (ptr != cookie && *(ptr - 1) == ' ') {
              strncpy(tmpcookie, cookie, ptr - cookie - 2);
              tmpcookie[ptr - cookie - 2] = 0;
            }
            ptr += strlen(tmpname);
            // if there are any cookies after this one in the cookiejar, copy them over
            if ((ptr2 = strstr(ptr, "; ")) != NULL) {
              ptr2 += 2;
              strncat(tmpcookie, ptr2, sizeof(tmpcookie) - strlen(tmpcookie) - 1);
            }
            if (debug)
              printf("[DEBUG] removing cookie %s in jar\n before: %s\n after:  %s\n", tmpname, cookie, tmpcookie);
            strcpy(cookie, tmpcookie);
          }
        }
        ptr = index(str, '=');
        // only copy the cookie if it has a value (otherwise the server wants to delete the cookie)
        if (ptr != NULL && *(ptr + 1) != ';' && *(ptr + 1) != 0 && *(ptr + 1) != '\n' && *(ptr + 1) != '\r') {
          if (strlen(cookie) > 0)
            strncat(cookie, "; ", sizeof(cookie) - strlen(cookie) - 1);
          strncat(cookie, str, sizeof(cookie) - strlen(cookie) - 1);
        }
        cookiebuf = startcookie;
      } while (hydra_strcasestr(cookiebuf, "Set-Cookie: ") != NULL);
    }
#ifdef HAVE_PCRE
    if (hydra_string_match(buf, cond) == 1) {
#else
    if (strstr(buf, cond) != NULL) {
#endif
      free(buf);
//      printf("DEBUG: STRING %s FOUND!!:\n%s\n", cond, buf);
      return 1;
    }
//    else printf("DEBUG: STRING %s NOT FOUND:\n%s\n", cond, buf);
    free(buf);
  }
  if (runs == 0) {
    if (debug)
      hydra_report(stderr, "DEBUG: no response from server\n");
    return -1;
  }
  return 0;
}

void hydra_reconnect(int32_t s, char *ip, int32_t port, unsigned char options, char *hostname) {
  if (s >= 0)
    s = hydra_disconnect(s);
  if ((options & OPTION_SSL) == 0) {
    s = hydra_connect_tcp(ip, port);
  } else {
    s = hydra_connect_ssl(ip, port, hostname);
  }
}

int32_t start_http_form(int32_t s, char *ip, int32_t port, unsigned char options, char *miscptr, FILE * fp, char *hostname, char *type, ptr_header_node ptr_head, ptr_cookie_node ptr_cookie) {
  char *empty = "";
  char *login, *pass, clogin[256], cpass[256];
  char header[8096], *upd3variables;
  char *cookie_header = NULL;
  char *http_request;
  int32_t found = !success_cond, i, j;
  char content_length[MAX_CONTENT_LENGTH], proxy_string[MAX_PROXY_LENGTH];

  memset(header, 0, sizeof(header));
  cookie[0] = 0;                // reset cookies from potential previous attempt

  if (use_proxy > 0 && proxy_count > 0)
    selected_proxy = random() % proxy_count;

  // Take the next login/pass pair
  if (strlen(login = hydra_get_next_login()) == 0)
    login = empty;
  if (strlen(pass = hydra_get_next_password()) == 0)
    pass = empty;
  strncpy(clogin, html_encode(login), sizeof(clogin) - 1);
  clogin[sizeof(clogin) - 1] = 0;
  strncpy(cpass, html_encode(pass), sizeof(cpass) - 1);
  cpass[sizeof(cpass) - 1] = 0;
  upd3variables = hydra_strrep(variables, "^USER^", clogin);
  upd3variables = hydra_strrep(upd3variables, "^PASS^", cpass);

  // Replace the user/pass placeholders in the user-supplied headers
  hdrrep(&ptr_head, "^USER^", clogin);
  hdrrep(&ptr_head, "^PASS^", cpass);

  /* again: no snprintf to be portable. don't worry, buffer can't overflow */
  if (use_proxy == 1 && proxy_authentication[selected_proxy] != NULL) {
    if (getcookie) {
      memset(proxy_string, 0, sizeof(proxy_string));
      snprintf(proxy_string, MAX_PROXY_LENGTH - 1, "http://%s:%d%.600s", webtarget, webport, cookieurl);
      http_request = prepare_http_request("GET", proxy_string, NULL, cookie_request);
      if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
        return 1;
      i = analyze_server_response(s);   // ignore result
      if (strlen(cookie) > 0)
        process_cookies(&ptr_cookie, cookie);
      hydra_reconnect(s, ip, port, options, hostname);
    }
    // now prepare for the "real" request
    if (strcmp(type, "POST") == 0) {
      memset(proxy_string, 0, sizeof(proxy_string));
      snprintf(proxy_string, MAX_PROXY_LENGTH - 1, "http://%s:%d%.600s", webtarget, webport, url);
      snprintf(content_length, MAX_CONTENT_LENGTH - 1, "%d", (int32_t) strlen(upd3variables));
      if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
        hdrrepv(&ptr_head, "Content-Length", content_length);
      else
        add_header(&ptr_head, "Content-Length", content_length, HEADER_TYPE_DEFAULT);
      if (!header_exists(&ptr_head, "Content-Type", HEADER_TYPE_DEFAULT))
        add_header(&ptr_head, "Content-Type", "application/x-www-form-urlencoded", HEADER_TYPE_DEFAULT);
      cookie_header = stringify_cookies(ptr_cookie);
      if (!header_exists(&ptr_head, "Cookie", HEADER_TYPE_DEFAULT))
      	add_header(&ptr_head, "Cookie", cookie_header, HEADER_TYPE_DEFAULT);
      else
      	hdrrepv(&ptr_head, "Cookie", cookie_header);
      normal_request = stringify_headers(&ptr_head);
      http_request = prepare_http_request("POST", proxy_string, upd3variables, normal_request);
      if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
        return 1;
    } else {
      if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
        hdrrepv(&ptr_head, "Content-Length", "0");
      cookie_header = stringify_cookies(ptr_cookie);
      if (!header_exists(&ptr_head, "Cookie", HEADER_TYPE_DEFAULT))
				add_header(&ptr_head, "Cookie", cookie_header, HEADER_TYPE_DEFAULT);
			else
				hdrrepv(&ptr_head, "Cookie", cookie_header);
    	normal_request = stringify_headers(&ptr_head);
      http_request = prepare_http_request("GET", proxy_string, upd3variables, normal_request);
      if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
        return 1;
    }
  } else {
    if (use_proxy == 1) {
      // proxy without authentication
      if (getcookie) {
        //doing a GET to get cookies
        memset(proxy_string, 0, sizeof(proxy_string));
        snprintf(proxy_string, MAX_PROXY_LENGTH - 1, "http://%s:%d%.600s", webtarget, webport, cookieurl);
        http_request = prepare_http_request("GET", proxy_string, NULL, cookie_request);
        if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
          return 1;
        i = analyze_server_response(s); // ignore result
        if (strlen(cookie) > 0)
          process_cookies(&ptr_cookie, cookie);
        hydra_reconnect(s, ip, port, options, hostname);
      }
      // now prepare for the "real" request
      if (strcmp(type, "POST") == 0) {
        memset(proxy_string, 0, sizeof(proxy_string));
        snprintf(proxy_string, MAX_PROXY_LENGTH - 1, "http://%s:%d%.600s", webtarget, webport, url);
        snprintf(content_length, MAX_CONTENT_LENGTH - 1, "%d", (int32_t) strlen(upd3variables));
        if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
          hdrrepv(&ptr_head, "Content-Length", content_length);
	else
	  add_header(&ptr_head, "Content-Length", content_length, HEADER_TYPE_DEFAULT);
        if (!header_exists(&ptr_head, "Content-Type", HEADER_TYPE_DEFAULT))
          add_header(&ptr_head, "Content-Type", "application/x-www-form-urlencoded", HEADER_TYPE_DEFAULT);
        cookie_header = stringify_cookies(ptr_cookie);
        if (!header_exists(&ptr_head, "Cookie", HEADER_TYPE_DEFAULT))
					add_header(&ptr_head, "Cookie", cookie_header, HEADER_TYPE_DEFAULT);
				else
					hdrrepv(&ptr_head, "Cookie", cookie_header);
        normal_request = stringify_headers(&ptr_head);
        http_request = prepare_http_request("POST", proxy_string, upd3variables, normal_request);
        if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
          return 1;
      } else {
        if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
          hdrrepv(&ptr_head, "Content-Length", "0");
      	cookie_header = stringify_cookies(ptr_cookie);
      	if (!header_exists(&ptr_head, "Cookie", HEADER_TYPE_DEFAULT))
					add_header(&ptr_head, "Cookie", cookie_header, HEADER_TYPE_DEFAULT);
				else
					hdrrepv(&ptr_head, "Cookie", cookie_header);
      	normal_request = stringify_headers(&ptr_head);
        http_request = prepare_http_request("GET", proxy_string, upd3variables, normal_request);
        if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
          return 1;
      }
    } else {
      // direct web server, no proxy
      if (getcookie) {
        //doing a GET to save cookies
        http_request = prepare_http_request("GET", cookieurl, NULL, cookie_request);
        if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
          return 1;
        i = analyze_server_response(s); // ignore result
        if (strlen(cookie) > 0) {
          //printf("[DEBUG] Got cookie: %s\n", cookie);
        	process_cookies(&ptr_cookie, cookie);
          normal_request = stringify_headers(&ptr_head);
        }
        hydra_reconnect(s, ip, port, options, hostname);
      }
      // now prepare for the "real" request
      if (strcmp(type, "POST") == 0) {
        snprintf(content_length, MAX_CONTENT_LENGTH - 1, "%d", (int32_t) strlen(upd3variables));
        if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
          hdrrepv(&ptr_head, "Content-Length", content_length);
        else
          add_header(&ptr_head, "Content-Length", content_length, HEADER_TYPE_DEFAULT);
        if (!header_exists(&ptr_head, "Content-Type", HEADER_TYPE_DEFAULT))
          add_header(&ptr_head, "Content-Type", "application/x-www-form-urlencoded", HEADER_TYPE_DEFAULT);
        cookie_header = stringify_cookies(ptr_cookie);
        if (!header_exists(&ptr_head, "Cookie", HEADER_TYPE_DEFAULT))
					add_header(&ptr_head, "Cookie", cookie_header, HEADER_TYPE_DEFAULT);
        else
					hdrrepv(&ptr_head, "Cookie", cookie_header);
        normal_request = stringify_headers(&ptr_head);
        http_request = prepare_http_request("POST", url, upd3variables, normal_request);
        if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
          return 1;
      } else {
        if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
          hdrrepv(&ptr_head, "Content-Length", "0");
      	cookie_header = stringify_cookies(ptr_cookie);
      	if (!header_exists(&ptr_head, "Cookie", HEADER_TYPE_DEFAULT))
					add_header(&ptr_head, "Cookie", cookie_header, HEADER_TYPE_DEFAULT);
				else
					hdrrepv(&ptr_head, "Cookie", cookie_header);
				normal_request = stringify_headers(&ptr_head);
        http_request = prepare_http_request("GET", url, upd3variables, normal_request);
        if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
          return 1;
      }
    }
  }

  if (debug)
  	hydra_report_debug(stdout, "HTTP request sent:\n%s\n", http_request);

  found = analyze_server_response(s);

  if (auth_flag) {              // we received a 401 error - user using wrong module
    hydra_report(stderr, "[ERROR] the target is using HTTP auth, not a web form, received HTTP error code 401. Use module \"http%s-get\" instead.\n",
                 (options & OPTION_SSL) > 0 ? "s" : "");
    return 4;
  }

  if (strlen(cookie) > 0)
    process_cookies(&ptr_cookie, cookie);

  //if page was redirected, follow the location header
  redirected_cpt = MAX_REDIRECT;
  if (debug)
    printf("[DEBUG] attempt result: found %d, redirect %d, location: %s\n", found, redirected_flag, redirected_url_buff);

  while (found == 0 && redirected_flag && (redirected_url_buff[0] != 0) && (redirected_cpt > 0)) {
    //we have to split the location
    char *startloc, *endloc;
    char str[2048];
    char str2[2048];
    char str3[2048];

    redirected_cpt--;
    redirected_flag = 0;
    //check if the redirect page contains the fail/success condition
#ifdef HAVE_PCRE
    if (hydra_string_match(redirected_url_buff, cond) == 1) {
#else
    if (strstr(redirected_url_buff, cond) != NULL) {
#endif
      found = success_cond;
    } else {
      //location could be either absolute http(s):// or / something
      //or relative
      startloc = strstr(redirected_url_buff, "://");
      if (startloc != NULL) {
        startloc += strlen("://");

        if ((endloc = strchr(startloc, '\r')) != NULL) {
          startloc[endloc - startloc] = 0;
        }
        if ((endloc = strchr(startloc, '\n')) != NULL) {
          startloc[endloc - startloc] = 0;
        }
        strcpy(str, startloc);

        endloc = strchr(str, '/');
        if (endloc != NULL) {
          strncpy(str2, str, endloc - str);
          str2[endloc - str] = 0;
        } else
          strncpy(str2, str, sizeof(str));

        if (strlen(str) - strlen(str2) == 0) {
          strcpy(str3, "/");
        } else {
          strncpy(str3, str + strlen(str2), strlen(str) - strlen(str2));
          str3[strlen(str) - strlen(str2)] = 0;
        }
      } else {
        strncpy(str2, webtarget, sizeof(str2));
        if (redirected_url_buff[0] != '/') {
          //it's a relative path, so we have to concatenate it
          //with the path from the first url given
          char *urlpath;
          char urlpath_extracted[2048];

          memset(urlpath_extracted, 0, sizeof(urlpath_extracted));

          urlpath = strrchr(url, '/');
          if (urlpath != NULL) {
            strncpy(urlpath_extracted, url, urlpath - url);
            sprintf(str3, "%.1000s/%.1000s", urlpath_extracted, redirected_url_buff);
          } else {
            sprintf(str3, "%.1000s/%.1000s", url, redirected_url_buff);
          }
        } else
          strncpy(str3, redirected_url_buff, sizeof(str3));
        if (debug)
          hydra_report(stderr, "[DEBUG] host=%s redirect=%s origin=%s\n", str2, str3, url);
      }
      if (str3[0] != '/') {
        j = strlen(str3);
        str3[j + 1] = 0;
        for (i = j; i > 0; i--)
          str3[i] = str3[i - 1];
        str3[0] = '/';
      }

      if(strrchr(url, ':') == NULL && port != 80) {
        sprintf(str2, "%s:%d", str2, port);
      }

      if (verbose)
        hydra_report(stderr, "[VERBOSE] Page redirected to http://%s%s\n", str2, str3);

      if (header_exists(&ptr_head, "Content-Length", HEADER_TYPE_DEFAULT))
        hdrrepv(&ptr_head, "Content-Length", "0");

      //re-use the code above to check for proxy use
      if (use_proxy == 1 && proxy_authentication[selected_proxy] != NULL) {
        // proxy with authentication
        hdrrepv(&ptr_head, "Host", str2);
        memset(proxy_string, 0, sizeof(proxy_string));
        snprintf(proxy_string, MAX_PROXY_LENGTH - 1, "http://%s:%d%.600s", webtarget, webport, str3);
        normal_request = stringify_headers(&ptr_head);
        http_request = prepare_http_request("GET", proxy_string, NULL, normal_request);
      } else {
        if (use_proxy == 1) {
          // proxy without authentication
          hdrrepv(&ptr_head, "Host", str2);
          memset(proxy_string, 0, sizeof(proxy_string));
          snprintf(proxy_string, MAX_PROXY_LENGTH - 1, "http://%s:%d%.600s", webtarget, webport, str3);
          normal_request = stringify_headers(&ptr_head);
          http_request = prepare_http_request("GET", proxy_string, NULL, normal_request);
        } else {
          //direct web server, no proxy
          hdrrepv(&ptr_head, "Host", str2);
          normal_request = stringify_headers(&ptr_head);
          http_request = prepare_http_request("GET", str3, NULL, normal_request);
        }
      }

      hydra_reconnect(s, ip, port, options, hostname);

      if (hydra_send(s, http_request, strlen(http_request), 0) < 0)
        return 1;

      found = analyze_server_response(s);
      if (strlen(cookie) > 0)
      	process_cookies(&ptr_cookie, cookie);
    }
  }

  //if the last status is still 3xx, set it as a false
  if (found != -1 && found == success_cond && (redirected_flag == 0 || success_cond == 1) && redirected_cpt >= 0) {
    hydra_report_found_host(port, ip, "www-form", fp);
    hydra_completed_pair_found();
  } else {
    hydra_completed_pair();
  }

  return 1;
}

void service_http_form(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname, char *type, ptr_header_node * ptr_head, ptr_cookie_node * ptr_cookie) {
  int32_t run = 1, next_run = 1, sock = -1;
  int32_t myport = PORT_HTTP, mysslport = PORT_HTTP_SSL;

  // register our socket descriptor
  hydra_register_socket(sp);

  /*
   * Iterate through the runs. Possible values are the following:
   *    - 1 -> Open connection to remote server.
   *    - 2 -> Run password attempts.
   *    - 3 -> Disconnect and end with success.
   *    - 4 -> Disconnect and end with error.
   */
  while (1) {
    if (run == 2) {
      if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0) {
        if (freemischttpform)
          free(miscptr);
        freemischttpform = 0;
        hydra_child_exit(1);
      }
    }
    switch (run) {
    case 1:                    /* connect and service init function */
      {
        if (sock >= 0)
          sock = hydra_disconnect(sock);
        if ((options & OPTION_SSL) == 0) {
          if (port != 0)
            myport = port;
          sock = hydra_connect_tcp(ip, myport);
          port = myport;
        } else {
          if (port != 0)
            mysslport = port;
          sock = hydra_connect_ssl(ip, mysslport, hostname);
          port = mysslport;
        }
        if (sock < 0) {
          hydra_report(stderr, "[ERROR] Child with pid %d terminating, cannot connect\n", (int32_t) getpid());
          if (freemischttpform)
            free(miscptr);
          freemischttpform = 0;
          hydra_child_exit(1);
        }
        next_run = 2;
        break;
      }
    case 2:                    /* run the cracking function */
      next_run = start_http_form(sock, ip, port, options, miscptr, fp, hostname, type, *ptr_head, *ptr_cookie);
      break;
    case 3:                    /* clean exit */
      if (sock >= 0)
        sock = hydra_disconnect(sock);
      if (freemischttpform)
        free(miscptr);
      freemischttpform = 0;
      hydra_child_exit(0);
      break;
    case 4:                    /* silent error exit */
      if (sock >= 0)
        sock = hydra_disconnect(sock);
      if (freemischttpform)
        free(miscptr);
      freemischttpform = 0;
      hydra_child_exit(1);
      break;
    default:
      if (freemischttpform)
        free(miscptr);
      freemischttpform = 0;
      hydra_report(stderr, "[ERROR] Caught unknown return code, exiting!\n");
      hydra_child_exit(0);
    }
    run = next_run;
  }
  if (freemischttpform)
    free(miscptr);
}

void service_http_get_form(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  ptr_cookie_node ptr_cookie = NULL;
	ptr_header_node ptr_head = initialize(ip, options, miscptr);

  if (ptr_head)
    service_http_form(ip, sp, options, miscptr, fp, port, hostname, "GET", &ptr_head, &ptr_cookie);
  else {
    hydra_report(stderr, "[ERROR] Could not launch head. Error while initializing.\n");
    hydra_child_exit(1);
  }
}

void service_http_post_form(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  ptr_cookie_node ptr_cookie = NULL;
	ptr_header_node ptr_head = initialize(ip, options, miscptr);

  if (ptr_head)
    service_http_form(ip, sp, options, miscptr, fp, port, hostname, "POST", &ptr_head, &ptr_cookie);
  else {
    hydra_report(stderr, "[ERROR] Could not launch head. Error while initializing.\n");
    hydra_child_exit(1);
  }
}

int32_t service_http_form_init(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  // called before the childrens are forked off, so this is the function
  // which should be filled if initial connections and service setup has to be
  // performed once only.
  //
  // fill if needed.
  //
  // return codes:
  //   0 all OK
  //   -1  error, hydra will exit, so print a good error message here

  return 0;
}

ptr_header_node initialize(char *ip, unsigned char options, char *miscptr) {
  ptr_header_node ptr_head = NULL;
  char *ptr, *ptr2, *proxy_string;
  
  if (use_proxy > 0 && proxy_count > 0)
    selected_proxy = random() % proxy_count;

  if (webtarget != NULL && (webtarget = strstr(miscptr, "://")) != NULL) {
    webtarget += strlen("://");
    if ((ptr2 = index(webtarget, ':')) != NULL) {       /* step over port if present */
      *ptr2 = 0;
      ptr2++;
      ptr = ptr2;
      if (*ptr == '/' || (ptr = index(ptr2, '/')) != NULL)
        miscptr = ptr;
      else
        miscptr = slash;        /* to make things easier to user */
    } else if ((ptr2 = index(webtarget, '/')) != NULL) {
      if (freemischttpform == 0) {
        if ((miscptr = malloc(strlen(ptr2) + 1)) != NULL) {
          freemischttpform = 1;
          strcpy(miscptr, ptr2);
          *ptr2 = 0;
        }
      }
    } else
      webtarget = NULL;
  }
  if (cmdlinetarget != NULL && webtarget == NULL)
    webtarget = cmdlinetarget;
  else if (webtarget == NULL && cmdlinetarget == NULL)
    webtarget = hydra_address2string(ip);
  if (port != 0)
    webport = port;
  else if ((options & OPTION_SSL) == 0)
    webport = PORT_HTTP;
  else
    webport = PORT_HTTP_SSL;

  sprintf(bufferurl, "%.6096s", miscptr);
  url = bufferurl;
  ptr = url;
  while (*ptr != 0 && (*ptr != ':' || *(ptr - 1) == '\\'))
    ptr++;
  if (*ptr != 0)
    *ptr++ = 0;
  variables = ptr;
  while (*ptr != 0 && (*ptr != ':' || *(ptr - 1) == '\\'))
    ptr++;
  if (*ptr != 0)
    *ptr++ = 0;
  cond = ptr;
  while (*ptr != 0 && (*ptr != ':' || *(ptr - 1) == '\\'))
    ptr++;
  if (*ptr != 0)
    *ptr++ = 0;
  optional1 = ptr;
  if (strstr(url, "\\:") != NULL) {
    if ((ptr = malloc(strlen(url))) != NULL) {
      strcpy(ptr, hydra_strrep(url, "\\:", ":"));
      url = ptr;
    }
  }
  if (strstr(variables, "\\:") != NULL) {
    if ((ptr = malloc(strlen(variables))) != NULL) {
      strcpy(ptr, hydra_strrep(variables, "\\:", ":"));
      variables = ptr;
    }
  }
  if (strstr(cond, "\\:") != NULL) {
    if ((ptr = malloc(strlen(cond))) != NULL) {
      strcpy(ptr, hydra_strrep(cond, "\\:", ":"));
      cond = ptr;
    }
  }
  if (url == NULL || variables == NULL || cond == NULL /*|| optional1 == NULL */ )
    hydra_child_exit(2);

  if (*cond == 0) {
    fprintf(stderr, "[ERROR] invalid number of parameters in module option\n");
    return NULL;
  }

  sprintf(cookieurl, "%.1000s", url);

  //conditions now have to contain F or S to set the fail or success condition
  if (*cond != 0 && (strpos(cond, "F=") == 0)) {
    success_cond = 0;
    cond += 2;
  } else if (*cond != 0 && (strpos(cond, "S=") == 0)) {
    success_cond = 1;
    cond += 2;
  } else {
    //by default condition is a fail
    success_cond = 0;
  }

  /*
   * Parse the user-supplied options.
   * Beware of the backslashes (\)!
   */
  while (*optional1 != 0) {
    switch (optional1[0]) {
    case 'c':                  // fall through
    case 'C':
      ptr = optional1 + 2;
      while (*ptr != 0 && (*ptr != ':' || *(ptr - 1) == '\\'))
        ptr++;
      if (*ptr != 0)
        *ptr++ = 0;
      sprintf(cookieurl, "%.1000s", hydra_strrep(optional1 + 2, "\\:", ":"));
      optional1 = ptr;
      break;
    case 'h':
      // add a new header at the end
			ptr = optional1 + 2;
      while (*ptr != 0 && *ptr != ':')
      	ptr++;
			if (*(ptr - 1) == '\\')
				*(ptr - 1) = 0;
			if (*ptr != 0){
				*ptr = 0;
				ptr += 2;
			}
      ptr2 = ptr;
      while (*ptr2 != 0 && (*ptr2 != ':' || *(ptr2 - 1) == '\\'))
        ptr2++;
      if (*ptr2 != 0)
        *ptr2++ = 0;
      /*
       * At this point:
       *  - (optional1 + 2) contains the header's name
       *  - ptr contains the header's value
       */
      if (add_header(&ptr_head, optional1 + 2, hydra_strrep(ptr, "\\:", ":"), HEADER_TYPE_USERHEADER)) {
        // Success: break the switch and go ahead
        optional1 = ptr2;
        break;
      }
      // Error: abort execution
      hydra_report(stderr, "[ERROR] Out of memory for HTTP headers (h).");
      return NULL;
    case 'H':
      // add a new header, or replace an existing one's value
			ptr = optional1 + 2;
      while (*ptr != 0 && *ptr != ':') ptr++;

      if (*(ptr - 1) == '\\')
	*(ptr - 1) = 0;

      if (*ptr != 0) {
	*ptr = 0;
        ptr += 2;
      }
      ptr2 = ptr;
      while (*ptr2 != 0 && (*ptr2 != ':' || *(ptr2 - 1) == '\\'))
        ptr2++;
      if (*ptr2 != 0)
        *ptr2++ = 0;
      /*
       * At this point:
       *  - (optional1 + 2) contains the header's name
       *  - ptr contains the header's value
       */
      if (add_header(&ptr_head, optional1 + 2, hydra_strrep(ptr, "\\:", ":"), HEADER_TYPE_USERHEADER_REPL)) {
        // Success: break the switch and go ahead
        optional1 = ptr2;
        break;
      }
      // Error: abort execution
      hydra_report(stderr, "[ERROR] Out of memory for HTTP headers (H).");
      return NULL;
      // no default
    }
  }

  /* again: no snprintf to be portable. don't worry, buffer can't overflow */
  if (use_proxy == 1 && proxy_authentication[selected_proxy] != NULL) {
    // proxy with authentication
    add_header(&ptr_head, "Host", webtarget, HEADER_TYPE_DEFAULT);
    add_header(&ptr_head, "User-Agent", "Mozilla 5.0 (Hydra Proxy Auth)", HEADER_TYPE_DEFAULT);
    proxy_string = (char *) malloc(strlen(proxy_authentication[selected_proxy]) + 6);
    if (proxy_string) {
      strcpy(proxy_string, "Basic ");
      strncat(proxy_string, proxy_authentication[selected_proxy], strlen(proxy_authentication[selected_proxy]) - 6);
      add_header(&ptr_head, "Proxy-Authorization", proxy_string, HEADER_TYPE_DEFAULT);
    } else {
      hydra_report(stderr, "Out of memory for \"Proxy-Authorization\" header.");
      return NULL;
    }
    if (getcookie) {
      //doing a GET to save cookies
      cookie_request = stringify_headers(&ptr_head);
    }
    normal_request = stringify_headers(&ptr_head);
  } else {
    if (use_proxy == 1) {
      // proxy without authentication
      add_header(&ptr_head, "Host", webtarget, HEADER_TYPE_DEFAULT);
      add_header(&ptr_head, "User-Agent", "Mozilla/5.0 (Hydra Proxy)", HEADER_TYPE_DEFAULT);
      if (getcookie) {
        //doing a GET to get cookies
        cookie_request = stringify_headers(&ptr_head);
      }
      normal_request = stringify_headers(&ptr_head);
    } else {
      // direct web server, no proxy
      add_header(&ptr_head, "Host", webtarget, HEADER_TYPE_DEFAULT);
      add_header(&ptr_head, "User-Agent", "Mozilla/5.0 (Hydra)", HEADER_TYPE_DEFAULT);

      if (getcookie) {
        //doing a GET to save cookies
        cookie_request = stringify_headers(&ptr_head);
      }

      normal_request = stringify_headers(&ptr_head);
    }
  }
  return ptr_head;
}

void usage_http_form(const char* service) {
  printf("Module %s requires the page and the parameters for the web form.\n\n"
         "By default this module is configured to follow a maximum of 5 redirections in\n"
         "a row. It always gathers a new cookie from the same URL without variables\n"
         "The parameters take three \":\" separated values, plus optional values.\n"
         "(Note: if you need a colon in the option string as value, escape it with \"\\:\", but do not escape a \"\\\" with \"\\\\\".)\n"
         "\nSyntax:   <url>:<form parameters>:<condition string>[:<optional>[:<optional>]\n"
         "First is the page on the server to GET or POST to (URL).\n"
         "Second is the POST/GET variables (taken from either the browser, proxy, etc.\n"
         " with usernames and passwords being replaced in the \"^USER^\" and \"^PASS^\"\n"
         " placeholders (FORM PARAMETERS)\n"
         "Third is the string that it checks for an *invalid* login (by default)\n"
         " Invalid condition login check can be preceded by \"F=\", successful condition\n"
         " login check must be preceded by \"S=\".\n"
         " This is where most people get it wrong. You have to check the webapp what a\n"
         " failed string looks like and put it in this parameter!\n"
         "The following parameters are optional:\n"
         " C=/page/uri     to define a different page to gather initial cookies from\n"
         " (h|H)=My-Hdr\\: foo   to send a user defined HTTP header with each request\n"
         "                 ^USER^ and ^PASS^ can also be put into these headers!\n"
         "                 Note: 'h' will add the user-defined header at the end\n"
         "                 regardless it's already being sent by Hydra or not.\n"
         "                 'H' will replace the value of that header if it exists, by the\n"
         "                 one supplied by the user, or add the header at the end\n"
         "Note that if you are going to put colons (:) in your headers you should escape them with a backslash (\\).\n"
         " All colons that are not option separators should be escaped (see the examples above and below).\n"
         " You can specify a header without escaping the colons, but that way you will not be able to put colons\n"
         " in the header value itself, as they will be interpreted by hydra as option separators.\n"
         "\nExamples:\n"
         " \"/login.php:user=^USER^&pass=^PASS^:incorrect\"\n"
         " \"/login.php:user=^USER^&pass=^PASS^&colon=colon\\:escape:S=authlog=.*success\"\n"
         " \"/login.php:user=^USER^&pass=^PASS^&mid=123:authlog=.*failed\"\n"
         " \"/:user=^USER&pass=^PASS^:failed:H=Authorization\\: Basic dT1w:H=Cookie\\: sessid=aaaa:h=X-User\\: ^USER^:H=User-Agent\\: wget\"\n"
         " \"/exchweb/bin/auth/owaauth.dll:destination=http%%3A%%2F%%2F<target>%%2Fexchange&flags=0&username=<domain>%%5C^USER^&password=^PASS^&SubmitCreds=x&trusted=0:reason=:C=/exchweb\"\n",
         service);
}