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/*
* Copyright (c) 2007-2009, 2013-2015, 2018-2019 Paul Mattes.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the names of Paul Mattes nor the names of his contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY PAUL MATTES "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 PAUL MATTES 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.
*/
/*
* proxy_http.c
* RFC 2817 HTTP CONNECT tunnel proxy.
*/
#include "globals.h"
#if !defined(_WIN32) /*[*/
# include <errno.h>
# include <sys/ioctl.h>
# include <netinet/in.h>
# include <netdb.h>
# include <arpa/inet.h>
#endif /*]*/
#include "base64.h"
#include "lazya.h"
#include "popups.h"
#include "proxy.h"
#include "proxy_private.h"
#include "proxy_http.h"
#include "resolver.h"
#include "telnet_core.h"
#include "trace.h"
#include "utils.h"
#include "w3misc.h"
#define RBUF 1024
/* Proxy state. */
static struct {
socket_t fd;
unsigned char *rbuf;
size_t nread;
} ps = { INVALID_SOCKET, NULL, 0 };
/* HTTP (RFC 2817 CONNECT tunnel) proxy. */
proxy_negotiate_ret_t
proxy_http(socket_t fd, const char *user, const char *host, unsigned short port)
{
char *sbuf;
char *colon;
ps.fd = fd;
ps.rbuf = Malloc(RBUF);
ps.nread = 0;
/* Send the CONNECT request. */
colon = strchr(host, ':');
sbuf = xs_buffer("CONNECT %s%s%s:%u HTTP/1.1\r\n",
(colon? "[": ""),
host,
(colon? "]": ""),
port);
vtrace("HTTP Proxy: xmit '%.*s'\n", (int)(strlen(sbuf) - 2), sbuf);
trace_netdata('>', (unsigned char *)sbuf, strlen(sbuf));
if (send(fd, sbuf, (int)strlen(sbuf), 0) < 0) {
popup_a_sockerr("HTTP Proxy: send error");
Free(sbuf);
return PX_FAILURE;
}
Free(sbuf);
sbuf = xs_buffer("Host: %s%s%s:%u\r\n",
(colon? "[": ""),
host,
(colon? "]": ""),
port);
vtrace("HTTP Proxy: xmit '%.*s'\n", (int)(strlen(sbuf) - 2), sbuf);
trace_netdata('>', (unsigned char *)sbuf, strlen(sbuf));
if (send(fd, sbuf, (int)strlen(sbuf), 0) < 0) {
popup_a_sockerr("HTTP Proxy: send error");
Free(sbuf);
return PX_FAILURE;
}
if (user != NULL) {
Free(sbuf);
sbuf = xs_buffer("Proxy-Authorization: Basic %s\r\n",
lazya(base64_encode(user)));
vtrace("HTTP Proxy: xmit '%.*s'\n", (int)(strlen(sbuf) - 2), sbuf);
trace_netdata('>', (unsigned char *)sbuf, strlen(sbuf));
if (send(fd, sbuf, (int)strlen(sbuf), 0) < 0) {
popup_a_sockerr("HTTP Proxy: send error");
Free(sbuf);
return PX_FAILURE;
}
}
Free(sbuf);
sbuf = "\r\n";
vtrace("HTTP Proxy: xmit ''\n");
trace_netdata('>', (unsigned char *)sbuf, strlen(sbuf));
if (send(fd, sbuf, (int)strlen(sbuf), 0) < 0) {
popup_a_sockerr("HTTP Proxy: send error");
return PX_FAILURE;
}
return PX_WANTMORE;
}
/* HTTP proxy continuation. */
proxy_negotiate_ret_t
proxy_http_continue(void)
{
char *space;
bool nl = false;
/*
* Process the reply.
* Read a byte at a time until two \n or EOF.
*/
for (;;) {
ssize_t nr = recv(ps.fd, (char *)&ps.rbuf[ps.nread], 1, 0);
if (nr < 0) {
if (socket_errno() == SE_EWOULDBLOCK) {
if (ps.nread) {
trace_netdata('<', ps.rbuf, ps.nread);
}
return PX_WANTMORE;
}
popup_a_sockerr("HTTP Proxy: receive error");
if (ps.nread) {
trace_netdata('<', ps.rbuf, ps.nread);
}
return PX_FAILURE;
}
if (nr == 0) {
if (ps.nread) {
trace_netdata('<', ps.rbuf, ps.nread);
}
popup_an_error("HTTP Proxy: unexpected EOF");
return PX_FAILURE;
}
if (++ps.nread >= RBUF) {
ps.nread = RBUF - 1;
break;
}
if (ps.nread && ps.rbuf[ps.nread - 1] == '\n') {
if (nl) {
break;
}
nl = true;
}
}
trace_netdata('<', ps.rbuf, ps.nread);
if (ps.rbuf[ps.nread - 1] == '\n') {
--ps.nread;
}
if (ps.rbuf[ps.nread - 1] == '\r') {
--ps.nread;
}
if (ps.rbuf[ps.nread - 1] == '\n') {
--ps.nread;
}
if (ps.rbuf[ps.nread - 1] == '\r') {
--ps.nread;
}
ps.rbuf[ps.nread] = '\0';
vtrace("HTTP Proxy: recv '%s'\n", (char *)ps.rbuf);
if (strncmp((char *)ps.rbuf, "HTTP/", 5) ||
(space = strchr((char *)ps.rbuf, ' ')) == NULL) {
popup_an_error("HTTP Proxy: unrecognized reply");
return PX_FAILURE;
}
if (*(space + 1) != '2') {
popup_an_error("HTTP Proxy: CONNECT failed:\n%s",
(char *)ps.rbuf);
return PX_FAILURE;
}
return PX_SUCCESS;
}
/*
* Close the HTTP proxy.
*/
void
proxy_http_close(void)
{
ps.fd = INVALID_SOCKET;
Replace(ps.rbuf, NULL);
ps.nread = 0;
}
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