/*
* Simple forking HTTP proxy. It is an HTTP/1.0 proxy with knowledge of
* HTTP/1.1. (The things lacking for HTTP/1.1 are the chunked transfer encoding
* and the expect mechanism.) The proxy supports the CONNECT, GET, HEAD, and
* POST methods. It supports Basic and Digest authentication of clients (use the
* --proxy-auth option).
*
* HTTP/1.1 is defined in RFC 2616. Many comments refer to that document.
* http://tools.ietf.org/html/rfc2616
*
* HTTP authentication is discussed in RFC 2617.
* http://tools.ietf.org/html/rfc2617
*
* The CONNECT method is documented in an Internet draft and is specified as the
* way to proxy HTTPS in RFC 2817, section 5.
* http://tools.ietf.org/html/draft-luotonen-web-proxy-tunneling-01
* http://tools.ietf.org/html/rfc2817#section-5
*
* The CONNECT method is not limited to HTTP, but is potentially capable of
* connecting to any TCP port on any host. The proxy connection is requested
* with an HTTP request, but after that, the proxy does no interpretation of the
* data passing through it. See section 6 of the above mentioned draft for the
* security implications.
*/
int ncat_http_server(void)
{
int c, s;
socklen_t sslen;
union sockaddr_u conn;
#ifndef WIN32
Signal(SIGCHLD, proxyreaper);
#endif
#if HAVE_HTTP_DIGEST
http_digest_init_secret();
#endif
#ifdef HAVE_OPENSSL
if (o.ssl)
setup_ssl_listen();
#endif
s = do_listen(SOCK_STREAM, IPPROTO_TCP);
for (;;) {
sslen = sizeof(conn.storage);
c = accept(s, &conn.sockaddr, &sslen);
if (c == -1) {
if (errno == EINTR)
continue;
die("accept");
}
if (!allow_access(&conn)) {
Close(c);
continue;
}
fork_handler(s, c);
}
return 0;
}
/*
* Simple forking HTTP proxy. It is an HTTP/1.0 proxy with knowledge of
* HTTP/1.1. (The things lacking for HTTP/1.1 are the chunked transfer encoding
* and the expect mechanism.) The proxy supports the CONNECT, GET, HEAD, and
* POST methods. It supports Basic and Digest authentication of clients (use the
* --proxy-auth option).
*
* HTTP/1.1 is defined in RFC 2616. Many comments refer to that document.
* http://tools.ietf.org/html/rfc2616
*
* HTTP authentication is discussed in RFC 2617.
* http://tools.ietf.org/html/rfc2617
*
* The CONNECT method is documented in an Internet draft and is specified as the
* way to proxy HTTPS in RFC 2817, section 5.
* http://tools.ietf.org/html/draft-luotonen-web-proxy-tunneling-01
* http://tools.ietf.org/html/rfc2817#section-5
*
* The CONNECT method is not limited to HTTP, but is potentially capable of
* connecting to any TCP port on any host. The proxy connection is requested
* with an HTTP request, but after that, the proxy does no interpretation of the
* data passing through it. See section 6 of the above mentioned draft for the
* security implications.
*/
int ncat_http_server(void)
{
int c, i, j;
int listen_socket[NUM_LISTEN_ADDRS];
socklen_t sslen;
union sockaddr_u conn;
struct timeval tv;
struct timeval *tvp = NULL;
#ifndef WIN32
Signal(SIGCHLD, proxyreaper);
#endif
#if HAVE_HTTP_DIGEST
http_digest_init_secret();
#endif
#ifdef HAVE_OPENSSL
if (o.ssl)
setup_ssl_listen();
#endif
/* Clear the socket list */
for (i = 0; i < NUM_LISTEN_ADDRS; i++)
listen_socket[i] = -1;
/* set for selecting listening sockets */
fd_set listen_fds;
fd_list_t listen_fdlist;
FD_ZERO(&listen_fds);
init_fdlist(&listen_fdlist, num_listenaddrs);
/* Listen on each address, set up lists for select */
for (i = 0; i < num_listenaddrs; i++) {
listen_socket[i] = do_listen(SOCK_STREAM, IPPROTO_TCP, &listenaddrs[i]);
/* make us not block on accepts in wierd cases. See ncat_listen.c:209 */
unblock_socket(listen_socket[i]);
/* setup select sets and max fd */
FD_SET(listen_socket[i], &listen_fds);
add_fd(&listen_fdlist, listen_socket[i]);
}
if (o.idletimeout > 0)
tvp = &tv;
for (;;) {
fd_set read_fds;
sslen = sizeof(conn.storage);
/*
* We just select to get a list of sockets which we can talk to
*/
if (o.debug > 1)
logdebug("selecting, fdmax %d\n", listen_fdlist.fdmax);
read_fds = listen_fds;
if (o.idletimeout > 0)
ms_to_timeval(tvp, o.idletimeout);
int fds_ready = fselect(listen_fdlist.fdmax + 1, &read_fds, NULL, NULL, tvp);
if (o.debug > 1)
logdebug("select returned %d fds ready\n", fds_ready);
if (fds_ready == 0)
bye("Idle timeout expired (%d ms).", o.idletimeout);
for (i = 0; i <= listen_fdlist.fdmax && fds_ready > 0; i++) {
/* Loop through descriptors until there is something ready */
if (!FD_ISSET(i, &read_fds))
continue;
/* Check each listening socket */
for (j = 0; j < num_listenaddrs; j++) {
if (i == listen_socket[j]) {
fds_ready--;
c = accept(i, &conn.sockaddr, &sslen);
if (c == -1) {
if (errno == EINTR)
continue;
die("accept");
}
if (!allow_access(&conn)) {
Close(c);
continue;
}
if (o.debug > 1)
logdebug("forking handler for %d\n", i);
fork_handler(i, c);
}
}
}
}
return 0;
}
