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585 lines
17 KiB
C
585 lines
17 KiB
C
/**
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* @file
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* Application layered TCP connection API that executes a proxy-connect.
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*
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* This file provides a starting layer that executes a proxy-connect e.g. to
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* set up TLS connections through a http proxy.
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*/
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/*
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* Copyright (c) 2018 Simon Goldschmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Simon Goldschmidt <goldsimon@gmx.de>
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*
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*/
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#include "lwip/apps/altcp_proxyconnect.h"
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#if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/altcp.h"
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#include "lwip/priv/altcp_priv.h"
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#include "lwip/altcp_tcp.h"
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#include "lwip/altcp_tls.h"
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#include "lwip/mem.h"
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#include "lwip/init.h"
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#include <stdio.h>
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/** This string is passed in the HTTP header as "User-Agent: " */
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#ifndef ALTCP_PROXYCONNECT_CLIENT_AGENT
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#define ALTCP_PROXYCONNECT_CLIENT_AGENT "lwIP/" LWIP_VERSION_STRING " (http://savannah.nongnu.org/projects/lwip)"
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#endif
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#define ALTCP_PROXYCONNECT_FLAGS_CONNECT_STARTED 0x01
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#define ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE 0x02
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typedef struct altcp_proxyconnect_state_s
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{
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ip_addr_t outer_addr;
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u16_t outer_port;
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struct altcp_proxyconnect_config *conf;
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u8_t flags;
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} altcp_proxyconnect_state_t;
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/* Variable prototype, the actual declaration is at the end of this file
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since it contains pointers to static functions declared here */
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extern const struct altcp_functions altcp_proxyconnect_functions;
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/* memory management functions: */
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static altcp_proxyconnect_state_t *
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altcp_proxyconnect_state_alloc(void)
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{
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altcp_proxyconnect_state_t *ret = (altcp_proxyconnect_state_t *)mem_calloc(1, sizeof(altcp_proxyconnect_state_t));
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return ret;
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}
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static void
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altcp_proxyconnect_state_free(altcp_proxyconnect_state_t *state)
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{
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LWIP_ASSERT("state != NULL", state != NULL);
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mem_free(state);
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}
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/* helper functions */
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#define PROXY_CONNECT "CONNECT %s:%d HTTP/1.1\r\n" /* HOST, PORT */ \
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"User-Agent: %s\r\n" /* User-Agent */\
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"Proxy-Connection: keep-alive\r\n" \
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"Connection: keep-alive\r\n" \
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"\r\n"
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#define PROXY_CONNECT_FORMAT(host, port) PROXY_CONNECT, host, port, ALTCP_PROXYCONNECT_CLIENT_AGENT
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/* Format the http proxy connect request via snprintf */
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static int
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altcp_proxyconnect_format_request(char *buffer, size_t bufsize, const char *host, int port)
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{
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return snprintf(buffer, bufsize, PROXY_CONNECT_FORMAT(host, port));
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}
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/* Create and send the http proxy connect request */
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static err_t
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altcp_proxyconnect_send_request(struct altcp_pcb *conn)
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{
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int len, len2;
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mem_size_t alloc_len;
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char *buffer, *host;
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altcp_proxyconnect_state_t *state = (altcp_proxyconnect_state_t *)conn->state;
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if (!state) {
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return ERR_VAL;
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}
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/* Use printf with zero length to get the required allocation size */
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len = altcp_proxyconnect_format_request(NULL, 0, "", state->outer_port);
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if (len < 0) {
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return ERR_VAL;
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}
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/* add allocation size for IP address strings */
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#if LWIP_IPV6
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len += 40; /* worst-case IPv6 address length */
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#else
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len += 16; /* worst-case IPv4 address length */
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#endif
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alloc_len = (mem_size_t)len;
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if ((len < 0) || (int)alloc_len != len) {
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/* overflow */
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return ERR_MEM;
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}
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/* Allocate a bufer for the request string */
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buffer = (char *)mem_malloc(alloc_len);
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if (buffer == NULL) {
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return ERR_MEM;
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}
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host = ipaddr_ntoa(&state->outer_addr);
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len2 = altcp_proxyconnect_format_request(buffer, alloc_len, host, state->outer_port);
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if ((len2 > 0) && (len2 <= len) && (len2 <= 0xFFFF)) {
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err_t err = altcp_write(conn->inner_conn, buffer, (u16_t)len2, TCP_WRITE_FLAG_COPY);
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if (err != ERR_OK) {
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/* @todo: abort? */
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mem_free(buffer);
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return err;
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}
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}
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mem_free(buffer);
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return ERR_OK;
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}
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/* callback functions from inner/lower connection: */
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/** Connected callback from lower connection (i.e. TCP).
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* Not really implemented/tested yet...
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*/
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static err_t
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altcp_proxyconnect_lower_connected(void *arg, struct altcp_pcb *inner_conn, err_t err)
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{
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struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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if (conn && conn->state) {
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LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
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LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
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/* upper connected is called when handshake is done */
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if (err != ERR_OK) {
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if (conn->connected) {
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if (conn->connected(conn->arg, conn, err) == ERR_ABRT) {
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return ERR_ABRT;
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}
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return ERR_OK;
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}
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}
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/* send proxy connect request here */
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return altcp_proxyconnect_send_request(conn);
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}
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return ERR_VAL;
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}
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/** Recv callback from lower connection (i.e. TCP)
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* This one mainly differs between connection setup (wait for proxy OK string)
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* and application phase (data is passed on to the application).
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*/
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static err_t
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altcp_proxyconnect_lower_recv(void *arg, struct altcp_pcb *inner_conn, struct pbuf *p, err_t err)
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{
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altcp_proxyconnect_state_t *state;
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struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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LWIP_ASSERT("no err expected", err == ERR_OK);
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LWIP_UNUSED_ARG(err);
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if (!conn) {
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/* no connection given as arg? should not happen, but prevent pbuf/conn leaks */
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if (p != NULL) {
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pbuf_free(p);
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}
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altcp_close(inner_conn);
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return ERR_CLSD;
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}
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state = (altcp_proxyconnect_state_t *)conn->state;
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LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
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if (!state) {
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/* already closed */
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if (p != NULL) {
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pbuf_free(p);
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}
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altcp_close(inner_conn);
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return ERR_CLSD;
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}
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if (state->flags & ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE) {
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/* application phase, just pass this through */
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if (conn->recv) {
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return conn->recv(conn->arg, conn, p, err);
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}
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pbuf_free(p);
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return ERR_OK;
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} else {
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/* setup phase */
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/* handle NULL pbuf (inner connection closed) */
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if (p == NULL) {
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if (altcp_close(conn) != ERR_OK) {
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altcp_abort(conn);
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return ERR_ABRT;
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}
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return ERR_OK;
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} else {
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/* @todo: parse setup phase rx data
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for now, we just wait for the end of the header... */
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u16_t idx = pbuf_memfind(p, "\r\n\r\n", 4, 0);
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altcp_recved(inner_conn, p->tot_len);
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pbuf_free(p);
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if (idx != 0xFFFF) {
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state->flags |= ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE;
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if (conn->connected) {
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return conn->connected(conn->arg, conn, ERR_OK);
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}
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}
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return ERR_OK;
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}
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}
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}
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/** Sent callback from lower connection (i.e. TCP)
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* This only informs the upper layer to try to send more, not about
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* the number of ACKed bytes.
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*/
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static err_t
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altcp_proxyconnect_lower_sent(void *arg, struct altcp_pcb *inner_conn, u16_t len)
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{
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struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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LWIP_UNUSED_ARG(len);
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if (conn) {
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altcp_proxyconnect_state_t *state = (altcp_proxyconnect_state_t *)conn->state;
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LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
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LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
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if (!state || !(state->flags & ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE)) {
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/* @todo: do something here? */
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return ERR_OK;
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}
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/* pass this on to upper sent */
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if (conn->sent) {
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return conn->sent(conn->arg, conn, len);
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}
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}
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return ERR_OK;
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}
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/** Poll callback from lower connection (i.e. TCP)
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* Just pass this on to the application.
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* @todo: retry sending?
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*/
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static err_t
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altcp_proxyconnect_lower_poll(void *arg, struct altcp_pcb *inner_conn)
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{
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struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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if (conn) {
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LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
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LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
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if (conn->poll) {
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return conn->poll(conn->arg, conn);
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}
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}
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return ERR_OK;
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}
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static void
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altcp_proxyconnect_lower_err(void *arg, err_t err)
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{
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struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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if (conn) {
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conn->inner_conn = NULL; /* already freed */
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if (conn->err) {
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conn->err(conn->arg, err);
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}
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altcp_free(conn);
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}
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}
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/* setup functions */
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static void
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altcp_proxyconnect_setup_callbacks(struct altcp_pcb *conn, struct altcp_pcb *inner_conn)
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{
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altcp_arg(inner_conn, conn);
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altcp_recv(inner_conn, altcp_proxyconnect_lower_recv);
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altcp_sent(inner_conn, altcp_proxyconnect_lower_sent);
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altcp_err(inner_conn, altcp_proxyconnect_lower_err);
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/* tcp_poll is set when interval is set by application */
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/* listen is set totally different :-) */
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}
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static err_t
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altcp_proxyconnect_setup(struct altcp_proxyconnect_config *config, struct altcp_pcb *conn, struct altcp_pcb *inner_conn)
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{
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altcp_proxyconnect_state_t *state;
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if (!config) {
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return ERR_ARG;
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}
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LWIP_ASSERT("invalid inner_conn", conn != inner_conn);
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/* allocate proxyconnect context */
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state = altcp_proxyconnect_state_alloc();
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if (state == NULL) {
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return ERR_MEM;
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}
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state->flags = 0;
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state->conf = config;
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altcp_proxyconnect_setup_callbacks(conn, inner_conn);
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conn->inner_conn = inner_conn;
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conn->fns = &altcp_proxyconnect_functions;
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conn->state = state;
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return ERR_OK;
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}
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/** Allocate a new altcp layer connecting through a proxy.
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* This function gets the inner pcb passed.
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*
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* @param config struct altcp_proxyconnect_config that contains the proxy settings
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* @param inner_pcb pcb that makes the connection to the proxy (i.e. tcp pcb)
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*/
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struct altcp_pcb *
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altcp_proxyconnect_new(struct altcp_proxyconnect_config *config, struct altcp_pcb *inner_pcb)
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{
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struct altcp_pcb *ret;
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if (inner_pcb == NULL) {
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return NULL;
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}
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ret = altcp_alloc();
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if (ret != NULL) {
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if (altcp_proxyconnect_setup(config, ret, inner_pcb) != ERR_OK) {
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altcp_free(ret);
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return NULL;
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}
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}
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return ret;
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}
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/** Allocate a new altcp layer connecting through a proxy.
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* This function allocates the inner pcb as tcp pcb, resulting in a direct tcp
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* connection to the proxy.
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*
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* @param config struct altcp_proxyconnect_config that contains the proxy settings
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* @param ip_type IP type of the connection (@ref lwip_ip_addr_type)
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*/
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struct altcp_pcb *
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altcp_proxyconnect_new_tcp(struct altcp_proxyconnect_config *config, u8_t ip_type)
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{
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struct altcp_pcb *inner_pcb, *ret;
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/* inner pcb is tcp */
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inner_pcb = altcp_tcp_new_ip_type(ip_type);
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if (inner_pcb == NULL) {
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return NULL;
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}
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ret = altcp_proxyconnect_new(config, inner_pcb);
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if (ret == NULL) {
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altcp_close(inner_pcb);
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}
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return ret;
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}
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/** Allocator function to allocate a proxy connect altcp pcb connecting directly
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* via tcp to the proxy.
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*
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* The returned pcb is a chain: altcp_proxyconnect - altcp_tcp - tcp pcb
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*
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* This function is meant for use with @ref altcp_new.
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*
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* @param arg struct altcp_proxyconnect_config that contains the proxy settings
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* @param ip_type IP type of the connection (@ref lwip_ip_addr_type)
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*/
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struct altcp_pcb *
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altcp_proxyconnect_alloc(void *arg, u8_t ip_type)
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{
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return altcp_proxyconnect_new_tcp((struct altcp_proxyconnect_config *)arg, ip_type);
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}
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#if LWIP_ALTCP_TLS
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/** Allocator function to allocate a TLS connection through a proxy.
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*
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* The returned pcb is a chain: altcp_tls - altcp_proxyconnect - altcp_tcp - tcp pcb
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*
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* This function is meant for use with @ref altcp_new.
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*
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* @param arg struct altcp_proxyconnect_tls_config that contains the proxy settings
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* and tls settings
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* @param ip_type IP type of the connection (@ref lwip_ip_addr_type)
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*/
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struct altcp_pcb *
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altcp_proxyconnect_tls_alloc(void *arg, u8_t ip_type)
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{
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struct altcp_proxyconnect_tls_config *cfg = (struct altcp_proxyconnect_tls_config *)arg;
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struct altcp_pcb *proxy_pcb;
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struct altcp_pcb *tls_pcb;
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proxy_pcb = altcp_proxyconnect_new_tcp(&cfg->proxy, ip_type);
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tls_pcb = altcp_tls_wrap(cfg->tls_config, proxy_pcb);
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if (tls_pcb == NULL) {
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altcp_close(proxy_pcb);
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}
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return tls_pcb;
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}
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#endif /* LWIP_ALTCP_TLS */
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/* "virtual" functions */
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static void
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altcp_proxyconnect_set_poll(struct altcp_pcb *conn, u8_t interval)
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{
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if (conn != NULL) {
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altcp_poll(conn->inner_conn, altcp_proxyconnect_lower_poll, interval);
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}
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}
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static void
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altcp_proxyconnect_recved(struct altcp_pcb *conn, u16_t len)
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{
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altcp_proxyconnect_state_t *state;
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if (conn == NULL) {
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return;
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}
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state = (altcp_proxyconnect_state_t *)conn->state;
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if (state == NULL) {
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return;
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}
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if (!(state->flags & ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE)) {
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return;
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}
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altcp_recved(conn->inner_conn, len);
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}
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static err_t
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altcp_proxyconnect_connect(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port, altcp_connected_fn connected)
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{
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altcp_proxyconnect_state_t *state;
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if ((conn == NULL) || (ipaddr == NULL)) {
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return ERR_VAL;
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}
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state = (altcp_proxyconnect_state_t *)conn->state;
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if (state == NULL) {
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return ERR_VAL;
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}
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if (state->flags & ALTCP_PROXYCONNECT_FLAGS_CONNECT_STARTED) {
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return ERR_VAL;
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}
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state->flags |= ALTCP_PROXYCONNECT_FLAGS_CONNECT_STARTED;
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conn->connected = connected;
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/* connect to our proxy instead, but store the requested address and port */
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ip_addr_copy(state->outer_addr, *ipaddr);
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state->outer_port = port;
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return altcp_connect(conn->inner_conn, &state->conf->proxy_addr, state->conf->proxy_port, altcp_proxyconnect_lower_connected);
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}
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static struct altcp_pcb *
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altcp_proxyconnect_listen(struct altcp_pcb *conn, u8_t backlog, err_t *err)
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{
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LWIP_UNUSED_ARG(conn);
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LWIP_UNUSED_ARG(backlog);
|
|
LWIP_UNUSED_ARG(err);
|
|
/* listen not supported! */
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
altcp_proxyconnect_abort(struct altcp_pcb *conn)
|
|
{
|
|
if (conn != NULL) {
|
|
if (conn->inner_conn != NULL) {
|
|
altcp_abort(conn->inner_conn);
|
|
}
|
|
altcp_free(conn);
|
|
}
|
|
}
|
|
|
|
static err_t
|
|
altcp_proxyconnect_close(struct altcp_pcb *conn)
|
|
{
|
|
if (conn == NULL) {
|
|
return ERR_VAL;
|
|
}
|
|
if (conn->inner_conn != NULL) {
|
|
err_t err = altcp_close(conn->inner_conn);
|
|
if (err != ERR_OK) {
|
|
/* closing inner conn failed, return the error */
|
|
return err;
|
|
}
|
|
}
|
|
/* no inner conn or closing it succeeded, deallocate myself */
|
|
altcp_free(conn);
|
|
return ERR_OK;
|
|
}
|
|
|
|
static err_t
|
|
altcp_proxyconnect_write(struct altcp_pcb *conn, const void *dataptr, u16_t len, u8_t apiflags)
|
|
{
|
|
altcp_proxyconnect_state_t *state;
|
|
|
|
LWIP_UNUSED_ARG(apiflags);
|
|
|
|
if (conn == NULL) {
|
|
return ERR_VAL;
|
|
}
|
|
|
|
state = (altcp_proxyconnect_state_t *)conn->state;
|
|
if (state == NULL) {
|
|
/* @todo: which error? */
|
|
return ERR_CLSD;
|
|
}
|
|
if (!(state->flags & ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE)) {
|
|
/* @todo: which error? */
|
|
return ERR_VAL;
|
|
}
|
|
return altcp_write(conn->inner_conn, dataptr, len, apiflags);
|
|
}
|
|
|
|
static void
|
|
altcp_proxyconnect_dealloc(struct altcp_pcb *conn)
|
|
{
|
|
/* clean up and free tls state */
|
|
if (conn) {
|
|
altcp_proxyconnect_state_t *state = (altcp_proxyconnect_state_t *)conn->state;
|
|
if (state) {
|
|
altcp_proxyconnect_state_free(state);
|
|
conn->state = NULL;
|
|
}
|
|
}
|
|
}
|
|
const struct altcp_functions altcp_proxyconnect_functions = {
|
|
altcp_proxyconnect_set_poll,
|
|
altcp_proxyconnect_recved,
|
|
altcp_default_bind,
|
|
altcp_proxyconnect_connect,
|
|
altcp_proxyconnect_listen,
|
|
altcp_proxyconnect_abort,
|
|
altcp_proxyconnect_close,
|
|
altcp_default_shutdown,
|
|
altcp_proxyconnect_write,
|
|
altcp_default_output,
|
|
altcp_default_mss,
|
|
altcp_default_sndbuf,
|
|
altcp_default_sndqueuelen,
|
|
altcp_default_nagle_disable,
|
|
altcp_default_nagle_enable,
|
|
altcp_default_nagle_disabled,
|
|
altcp_default_setprio,
|
|
altcp_proxyconnect_dealloc,
|
|
altcp_default_get_tcp_addrinfo,
|
|
altcp_default_get_ip,
|
|
altcp_default_get_port
|
|
#ifdef LWIP_DEBUG
|
|
, altcp_default_dbg_get_tcp_state
|
|
#endif
|
|
};
|
|
|
|
#endif /* LWIP_ALTCP */
|