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/*
* Copyright 2000-2004 (c) Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/tree.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <event.h>
#include <dnet.h>
#include "scanssh.h"
#include "socks.h"
#ifdef DEBUG
extern int debug;
#define DFPRINTF(x) if (debug) fprintf x
#else
#define DFPRINTF(x)
#endif
extern rand_t *ss_rand;
void http_init(struct bufferevent *bev, struct argument *arg);
void http_finalize(struct bufferevent *bev, struct argument *arg);
void http_readcb(struct bufferevent *bev, void *parameter);
void http_writecb(struct bufferevent *bev, void *parameter);
void http_errorcb(struct bufferevent *bev, short what, void *parameter);
#define HTTP_WAITING_RESPONSE 0x0001
#define HTTP_WAITING_CONNECT 0x0002
#define HTTP_READING_CONNECT 0x0004
#define HTTP_WRITING_COMMAND 0x0008
#define HTTP_GOT_HEADERS 0x0100
#define HTTP_GOT_OK 0x0200
#define HTTP10_OK "HTTP/1.0 200 "
#define HTTP11_OK "HTTP/1.1 200 "
int
http_response(char *line)
{
if (strncasecmp(line, HTTP10_OK, strlen(HTTP10_OK)) &&
strncasecmp(line, HTTP11_OK, strlen(HTTP11_OK)))
return (-1);
return (0);
}
int
http_getheaders(struct bufferevent *bev, struct argument *arg)
{
struct evbuffer *input = EVBUFFER_INPUT(bev);
size_t off;
char *p;
while ((p = evbuffer_find(input, "\n", 1)) != NULL) {
off = (size_t)p - (size_t)EVBUFFER_DATA(input) + 1;
if (off > 1 && *(p-1) == '\r')
*(p-1) = '\0';
*p = '\0';
if (strlen(EVBUFFER_DATA(input)) == 0) {
arg->a_flags |= HTTP_GOT_HEADERS;
evbuffer_drain(input, off);
break;
} else {
DFPRINTF((stderr, "Header: %s\n",
EVBUFFER_DATA(input)));
}
/* Check that we got an okay */
if (!(arg->a_flags & HTTP_GOT_OK)) {
if (http_response(EVBUFFER_DATA(input)) == -1) {
return (-1);
}
arg->a_flags |= HTTP_GOT_OK;
}
evbuffer_drain(input, off);
}
return (0);
}
int
http_bufferanalyse(struct bufferevent *bev, struct argument *arg)
{
struct evbuffer *input = EVBUFFER_INPUT(bev);
if (!(arg->a_flags & HTTP_GOT_HEADERS)) {
if (http_getheaders(bev, arg) == -1) {
postres(arg, "<error: response code>");
scanhost_return(bev, arg, 0);
return (-1);
}
}
if (arg->a_flags & HTTP_GOT_HEADERS) {
if (evbuffer_find(input, "\r\n", 2) == NULL)
return (0);
return (1);
}
return (0);
}
void
http_makerequest(struct bufferevent *bev, struct argument *arg,
const char *word, int fqdn)
{
extern struct addr *socks_dst_addr;
ip_addr_t address;
socks_resolveaddress("www.google.com", &address);
evbuffer_add_printf(EVBUFFER_OUTPUT(bev),
"GET %s%s/search?hl=en&ie=UTF-8&oe=UTF-8&q=%s&btnG=Google+Search HTTP/1.0\r\n"
"Host: www.google.com\r\n"
"User-Agent: %s\r\n"
"\r\n",
fqdn ? "http://" : "",
fqdn ? addr_ntoa(socks_dst_addr) : "",
word, SSHUSERAGENT);
bufferevent_enable(bev, EV_WRITE);
}
void
http_makeconnect(struct bufferevent *bev, struct argument *arg)
{
extern struct addr *socks_dst_addr;
ip_addr_t address;
socks_resolveaddress("www.google.com", &address);
evbuffer_add_printf(EVBUFFER_OUTPUT(bev),
"CONNECT %s:80 HTTP/1.0\r\n"
"\r\n", addr_ntoa(socks_dst_addr), SSHUSERAGENT);
bufferevent_enable(bev, EV_WRITE);
}
/* Scanner related functions */
void
http_init(struct bufferevent *bev, struct argument *arg)
{
arg->a_flags = 0;
}
void
http_finalize(struct bufferevent *bev, struct argument *arg)
{
arg->a_flags = 0;
}
void
http_readcb(struct bufferevent *bev, void *parameter)
{
struct argument *arg = parameter;
DFPRINTF((stderr, "%s: called\n", __func__));
if (arg->a_flags & HTTP_WAITING_RESPONSE) {
int res = http_bufferanalyse(bev, arg);
if (res == -1)
return;
if (res == 1) {
postres(arg, "http proxy");
scanhost_return(bev, arg, 1);
}
}
return;
scanhost_return(bev, arg, 0);
}
void
http_writecb(struct bufferevent *bev, void *parameter)
{
struct argument *arg = parameter;
DFPRINTF((stderr, "%s: called\n", __func__));
switch (arg->a_flags) {
case 0:
arg->a_flags = HTTP_WAITING_RESPONSE;
http_makerequest(bev, arg, socks_getword(), 1);
break;
}
}
void
http_errorcb(struct bufferevent *bev, short what, void *parameter)
{
struct argument *arg = parameter;
DFPRINTF((stderr, "%s: called\n", __func__));
postres(arg, "<error>");
scanhost_return(bev, arg, 0);
}
/* HTTP Connect method */
void
http_connect_readcb(struct bufferevent *bev, void *parameter)
{
struct argument *arg = parameter;
DFPRINTF((stderr, "%s: called\n", __func__));
if (arg->a_flags & HTTP_READING_CONNECT) {
if (!(arg->a_flags & HTTP_GOT_HEADERS)) {
if (http_getheaders(bev, arg) == -1) {
postres(arg, "<error: response code>");
scanhost_return(bev, arg, 0);
return;
}
}
if (arg->a_flags & HTTP_GOT_HEADERS) {
arg->a_flags = HTTP_WRITING_COMMAND;
http_makerequest(bev, arg, socks_getword(), 0);
bufferevent_disable(bev, EV_READ);
return;
}
} else if (arg->a_flags & HTTP_WAITING_RESPONSE) {
int res = http_bufferanalyse(bev, arg);
if (res == -1)
return;
if (res == -1) {
postres(arg, "http connect proxy");
scanhost_return(bev, arg, 1);
}
}
return;
scanhost_return(bev, arg, 0);
}
void
http_connect_writecb(struct bufferevent *bev, void *parameter)
{
struct argument *arg = parameter;
DFPRINTF((stderr, "%s: called\n", __func__));
if (arg->a_flags == 0) {
arg->a_flags = HTTP_WAITING_CONNECT;
http_makeconnect(bev, arg);
bufferevent_disable(bev, EV_READ);
} else if (arg->a_flags & HTTP_WAITING_CONNECT) {
bufferevent_enable(bev, EV_READ);
arg->a_flags = HTTP_READING_CONNECT;
} else if (arg->a_flags & HTTP_WRITING_COMMAND) {
bufferevent_enable(bev, EV_READ);
arg->a_flags = HTTP_WAITING_RESPONSE;
}
}
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