Squashed 'lib/lwip/lwip/' content from commit 0a0452b2c39b

git-subtree-dir: lib/lwip/lwip
git-subtree-split: 0a0452b2c39bdd91e252aef045c115f88f6ca773

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diff --git a/contrib/examples/httpd/post_example/post_example.c b/contrib/examples/httpd/post_example/post_example.c
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+++ b/contrib/examples/httpd/post_example/post_example.c
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+/**
+ * @file
+ * HTTPD example for simple POST
+ */
+ 
+ /*
+ * Copyright (c) 2017 Simon Goldschmidt
+ * 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.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ * 
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/apps/httpd.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+
+#include <stdio.h>
+#include <string.h>
+
+/** define LWIP_HTTPD_EXAMPLE_GENERATEDFILES to 1 to enable this file system */
+#ifndef LWIP_HTTPD_EXAMPLE_SIMPLEPOST
+#define LWIP_HTTPD_EXAMPLE_SIMPLEPOST 0
+#endif
+
+#if LWIP_HTTPD_EXAMPLE_SIMPLEPOST
+
+#if !LWIP_HTTPD_SUPPORT_POST
+#error This needs LWIP_HTTPD_SUPPORT_POST
+#endif
+
+#define USER_PASS_BUFSIZE 16
+
+static void *current_connection;
+static void *valid_connection;
+static char last_user[USER_PASS_BUFSIZE];
+
+err_t
+httpd_post_begin(void *connection, const char *uri, const char *http_request,
+                 u16_t http_request_len, int content_len, char *response_uri,
+                 u16_t response_uri_len, u8_t *post_auto_wnd)
+{
+  LWIP_UNUSED_ARG(connection);
+  LWIP_UNUSED_ARG(http_request);
+  LWIP_UNUSED_ARG(http_request_len);
+  LWIP_UNUSED_ARG(content_len);
+  LWIP_UNUSED_ARG(post_auto_wnd);
+  if (!memcmp(uri, "/login.cgi", 11)) {
+    if (current_connection != connection) {
+      current_connection = connection;
+      valid_connection = NULL;
+      /* default page is "login failed" */
+      snprintf(response_uri, response_uri_len, "/loginfail.html");
+      /* e.g. for large uploads to slow flash over a fast connection, you should
+         manually update the rx window. That way, a sender can only send a full
+         tcp window at a time. If this is required, set 'post_aut_wnd' to 0.
+         We do not need to throttle upload speed here, so: */
+      *post_auto_wnd = 1;
+      return ERR_OK;
+    }
+  }
+  return ERR_VAL;
+}
+
+err_t
+httpd_post_receive_data(void *connection, struct pbuf *p)
+{
+  err_t ret;
+
+  LWIP_ASSERT("NULL pbuf", p != NULL);
+
+  if (current_connection == connection) {
+    u16_t token_user = pbuf_memfind(p, "user=", 5, 0);
+    u16_t token_pass = pbuf_memfind(p, "pass=", 5, 0);
+    if ((token_user != 0xFFFF) && (token_pass != 0xFFFF)) {
+      u16_t value_user = token_user + 5;
+      u16_t value_pass = token_pass + 5;
+      u16_t len_user = 0;
+      u16_t len_pass = 0;
+      u16_t tmp;
+      /* find user len */
+      tmp = pbuf_memfind(p, "&", 1, value_user);
+      if (tmp != 0xFFFF) {
+        len_user = tmp - value_user;
+      } else {
+        len_user = p->tot_len - value_user;
+      }
+      /* find pass len */
+      tmp = pbuf_memfind(p, "&", 1, value_pass);
+      if (tmp != 0xFFFF) {
+        len_pass = tmp - value_pass;
+      } else {
+        len_pass = p->tot_len - value_pass;
+      }
+      if ((len_user > 0) && (len_user < USER_PASS_BUFSIZE) &&
+          (len_pass > 0) && (len_pass < USER_PASS_BUFSIZE)) {
+        /* provide contiguous storage if p is a chained pbuf */
+        char buf_user[USER_PASS_BUFSIZE];
+        char buf_pass[USER_PASS_BUFSIZE];
+        char *user = (char *)pbuf_get_contiguous(p, buf_user, sizeof(buf_user), len_user, value_user);
+        char *pass = (char *)pbuf_get_contiguous(p, buf_pass, sizeof(buf_pass), len_pass, value_pass);
+        if (user && pass) {
+          user[len_user] = 0;
+          pass[len_pass] = 0;
+          if (!strcmp(user, "lwip") && !strcmp(pass, "post")) {
+            /* user and password are correct, create a "session" */
+            valid_connection = connection;
+            memcpy(last_user, user, sizeof(last_user));
+          }
+        }
+      }
+    }
+    /* not returning ERR_OK aborts the connection, so return ERR_OK unless the
+       connection is unknown */
+    ret = ERR_OK;
+  } else {
+    ret = ERR_VAL;
+  }
+
+  /* this function must ALWAYS free the pbuf it is passed or it will leak memory */
+  pbuf_free(p);
+
+  return ret;
+}
+
+void
+httpd_post_finished(void *connection, char *response_uri, u16_t response_uri_len)
+{
+  /* default page is "login failed" */
+  snprintf(response_uri, response_uri_len, "/loginfail.html");
+  if (current_connection == connection) {
+    if (valid_connection == connection) {
+      /* login succeeded */
+      snprintf(response_uri, response_uri_len, "/session.html");
+    }
+    current_connection = NULL;
+    valid_connection = NULL;
+  }
+}
+
+#endif /* LWIP_HTTPD_EXAMPLE_SIMPLEPOST*/