//***************************************************************************** // HTTP server. // Adam Dunkels // // Copyright (c) 2001, Adam Dunkels. // 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 uIP TCP/IP stack. // //***************************************************************************** #include "uip.h" #include "httpd.h" //***************************************************************************** // // Macro for easy access to buffer data // //***************************************************************************** #define BUF_APPDATA ((u8_t *)uip_appdata) //***************************************************************************** // // Definitions of HTTP Server States // //***************************************************************************** #define HTTP_NOGET 0 #define HTTP_FILE 1 #define HTTP_TEXT 2 #define HTTP_FUNC 3 #define HTTP_END 4 //***************************************************************************** // // Global for keeping up with web server state. // //***************************************************************************** struct httpd_state *hs; //***************************************************************************** // // Default Web Page - allocated in three segments to allow easy update of a // counter that is incremented each time the page is sent. // //***************************************************************************** static const char page_not_found[] = "HTTP/1.0 404 OK\r\n" "Server: UIP/1.0 (http://www.sics.se/~adam/uip/)\r\n" "Content-type: text/html\r\n\r\n" "" "" "" "Page Not Found!" "" "" "Page Not Found!" "" ""; //***************************************************************************** // // Default Web Page - allocated in three segments to allow easy update of a // counter that is incremented each time the page is sent. // //***************************************************************************** static const char default_page_buf1of3[] = "HTTP/1.0 200 OK\r\n" "Server: UIP/1.0 (http://www.sics.se/~adam/uip/)\r\n" "Content-type: text/html\r\n\r\n" "" "" "" "Welcome to the uIP web server!" "" "" "" "

µIP Web Server

" "

This web page is served by a small web server running on top of " "the µIP embedded TCP/IP " "stack." "

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The µIP stack is running on a " "Texas Instruments " "Stellaris^® Ethernet Evaluation Kit" "

" "

This page has been sent "; static char default_page_buf2of3[] = "00001"; static const char default_page_buf3of3[] = " times since reset!" "

" "" ""; //***************************************************************************** // // Increment the view count. This routine will increment the 5-digit ascii // counter that is sent with the web page. // //***************************************************************************** static void httpd_inc_page_count(void) { // // Increment the 'ones' digit. If it wraps, then increment the 'tens' // digit. // default_page_buf2of3[4]++; if (default_page_buf2of3[4] == 0x3a) { default_page_buf2of3[4] = 0x30; default_page_buf2of3[3]++; } // // If the 'tens' digit wraps, increment the 'hundreds' digit. // if (default_page_buf2of3[3] == 0x3a) { default_page_buf2of3[3] = 0x30; default_page_buf2of3[2]++; } // // If the 'hundreds' digit wraps, increment the 'thousands' digit. // if (default_page_buf2of3[2] == 0x3a) { default_page_buf2of3[2] = 0x30; default_page_buf2of3[1]++; } // // If the 'thousands' digit wraps, increment the 'ten-thousands' digit. // if (default_page_buf2of3[1] == 0x3a) { default_page_buf2of3[1] = 0x30; default_page_buf2of3[0]++; } // // If the 'ten-thousands' digit wrapped, start over. // if (default_page_buf2of3[0] == 0x3a) { default_page_buf2of3[0] = 0x30; } } //***************************************************************************** // // Initialize the web server. // // Starts to listen for incoming connection requests on TCP port 80. // //***************************************************************************** void httpd_init(void) { // // Listen to port 80. // uip_listen(HTONS(80)); } //***************************************************************************** // // HTTP Application Callback Function // //***************************************************************************** void httpd_appcall(void) { switch (uip_conn->lport) { // // This is the web server: // case HTONS(80): { // // Pick out the application state from the uip_conn structure. // hs = (struct httpd_state *)&(uip_conn->appstate); // // We use the uip_ test functions to deduce why we were // called. If uip_connected() is non-zero, we were called // because a remote host has connected to us. If // uip_newdata() is non-zero, we were called because the // remote host has sent us new data, and if uip_acked() is // non-zero, the remote host has acknowledged the data we // previously sent to it. */ if (uip_connected()) { // // Since we have just been connected with the remote host, we // reset the state for this connection. The ->count variable // contains the amount of data that is yet to be sent to the // remote host, and the ->state is set to HTTP_NOGET to signal // that we haven't received any HTTP GET request for this // connection yet. // hs->state = HTTP_NOGET; hs->count = 0; return; } else if (uip_poll()) { // // If we are polled ten times, we abort the connection. This is // because we don't want connections lingering indefinately in // the system. // if (hs->count++ >= 10) { uip_abort(); } return; } else if (uip_newdata() && hs->state == HTTP_NOGET) { // // This is the first data we receive, and it should contain a // GET. // // Check for GET. // if (BUF_APPDATA[0] != 'G' || BUF_APPDATA[1] != 'E' || BUF_APPDATA[2] != 'T' || BUF_APPDATA[3] != ' ') { // // If it isn't a GET, we abort the connection. // uip_abort(); return; } // // Check to see what we should send. // if ((BUF_APPDATA[4] == '/') && (BUF_APPDATA[5] == ' ')) { // // Send buffer 1 // uip_send(default_page_buf1of3, sizeof(default_page_buf1of3) - 1); } else { uip_send(page_not_found, sizeof(page_not_found) - 1); hs->count = 3; } } else if (uip_acked()) { hs->count++; if (hs->count == 1) { uip_send(default_page_buf2of3, sizeof(default_page_buf2of3) - 1); } else if (hs->count == 2) { uip_send(default_page_buf3of3, sizeof(default_page_buf3of3) - 1); } else if (hs->count == 3) { httpd_inc_page_count(); uip_close(); } else { uip_close(); } } // // Finally, return to uIP. Our outgoing packet will soon be on its // way... // return; } default: { // // Should never happen. // uip_abort(); break; } } }