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/* =================================================================
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*
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* httpd.c
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*
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* A simple embedded HTTP server
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*
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* =================================================================
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* ####ECOSGPLCOPYRIGHTBEGIN####
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* -------------------------------------------
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* This file is part of eCos, the Embedded Configurable Operating
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* System.
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* Copyright (C) 2002 Nick Garnett.
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*
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* eCos is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 or (at your option)
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* any later version.
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*
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* eCos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with eCos; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* As a special exception, if other files instantiate templates or
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* use macros or inline functions from this file, or you compile this
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* file and link it with other works to produce a work based on this
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* file, this file does not by itself cause the resulting work to be
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* covered by the GNU General Public License. However the source code
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* for this file must still be made available in accordance with
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* section (3) of the GNU General Public License.
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*
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* This exception does not invalidate any other reasons why a work
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* based on this file might be covered by the GNU General Public
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* License.
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*
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* -------------------------------------------
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* ####ECOSGPLCOPYRIGHTEND####
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* =================================================================
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* #####DESCRIPTIONBEGIN####
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*
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* Author(s): nickg@calivar.com
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* Contributors: nickg@calivar.com
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* Date: 2002-10-14
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* Purpose:
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* Description:
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*
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* ####DESCRIPTIONEND####
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*
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* =================================================================
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*/
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#include <pkgconf/system.h>
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#include <pkgconf/isoinfra.h>
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#include <pkgconf/httpd.h>
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#include <cyg/infra/cyg_trac.h> /* tracing macros */
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#include <cyg/infra/cyg_ass.h> /* assertion macros */
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <network.h>
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#include <arpa/inet.h>
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#include <cyg/httpd/httpd.h>
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/* ================================================================= */
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#if 0
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#define HTTPD_DIAG diag_printf
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#else
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#define HTTPD_DIAG(...)
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#endif
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/* ================================================================= */
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/* Server socket address and file descriptor.
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*/
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static struct sockaddr_in server_address;
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static int server_socket = -1;
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/* ================================================================= */
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/* Thread stacks, etc.
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*/
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static cyg_uint8 httpd_stacks[CYGNUM_HTTPD_THREAD_COUNT]
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[CYGNUM_HAL_STACK_SIZE_MINIMUM+
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CYGNUM_HTTPD_SERVER_BUFFER_SIZE+
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CYGNUM_HTTPD_THREAD_STACK_SIZE];
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static cyg_handle_t httpd_thread[CYGNUM_HTTPD_THREAD_COUNT];
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static cyg_thread httpd_thread_object[CYGNUM_HTTPD_THREAD_COUNT];
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/* ================================================================= */
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/* Filename lookup table
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*/
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CYG_HAL_TABLE_BEGIN( cyg_httpd_table, httpd_table );
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CYG_HAL_TABLE_END( cyg_httpd_table_end, httpd_table );
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__externC cyg_httpd_table_entry cyg_httpd_table[];
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__externC cyg_httpd_table_entry cyg_httpd_table_end[];
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/* ================================================================= */
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/* Page not found message
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*/
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static char cyg_httpd_not_found[] =
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"<head><title>Page Not found</title></head>\n"
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"<body><h2>The requested URL was not found on this server.</h2></body>\n";
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/* ================================================================= */
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/* Simple pattern matcher for filenames
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*
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* This performs a simple pattern match between the given name and the
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* pattern. At present the only matching supported is either exact, or
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* if the pattern ends in * then that matches all remaining
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* characters. At some point we might want to implement a more
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* complete regular expression parser here.
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*/
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static cyg_bool match( char *name, char *pattern )
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{
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while( *name != 0 && *pattern != 0 && *name == *pattern )
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name++, pattern++;
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if( *name == 0 && *pattern == 0 )
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return true;
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if( *pattern == '*' )
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return true;
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return false;
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}
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/* ================================================================= */
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/* Main HTTP server
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*
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* This just loops, collects client connections, reads the HTTP
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* header, look it up in the table and calls the handler.
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*/
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static void cyg_httpd_server( cyg_addrword_t arg )
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{
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do
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{
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int err;
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int client_socket;
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struct sockaddr_in client_address;
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int calen;
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int nlc = 0;
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char request[CYGNUM_HTTPD_SERVER_BUFFER_SIZE];
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FILE *client;
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cyg_httpd_table_entry *entry = cyg_httpd_table;
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char *filename;
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char *formdata = NULL;
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char *p;
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cyg_bool success = false;
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/* Wait for a connection.
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*/
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client_socket = accept( server_socket, (struct sockaddr *)&client_address, &calen );
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HTTPD_DIAG("Connection from %08x[%d]\n",client_address.sin_addr.s_addr,
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client_address.sin_port);
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/* Convert the file descriptor to a C library FILE object so
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* we can use fprintf() and friends on it.
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*/
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client = fdopen( client_socket, "r+");
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/* We are really only interested in the first line.
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*/
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fgets( request, sizeof(request), client );
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HTTPD_DIAG("Request >%s<\n", request );
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/* Absorb the rest of the header. We nibble it away a
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* character at a time like this to avoid having to define
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* another buffer to read lines into. If we ever need to take
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* more interest in the header fields, we will need to be a
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* lot more sophisticated than this.
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*/
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do{
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int c = getc( client );
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HTTPD_DIAG("%c",c);
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if( c == '\n' )
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nlc++;
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else if( c != '\r' )
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nlc = 0;
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} while(nlc < 2);
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/* Extract the filename and any form data being returned.
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* We know that the "GET " request takes 4 bytes.
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* TODO: handle POST type requests as well as GET's.
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*/
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filename = p = request+4;
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/* Now scan the filename until we hit a space or a '?'. If we
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* end on a '?' then the rest is a form request. Put NULs at
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* the end of each string.
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*/
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while( *p != ' ' && *p != '?' )
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p++;
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if( *p == '?' )
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formdata = p+1;
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*p = 0;
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if( formdata != NULL )
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{
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while( *p != ' ' )
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p++;
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*p = 0;
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}
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HTTPD_DIAG("Request filename >%s< formdata >%s<\n",filename,formdata?formdata:"-NULL-");
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HTTPD_DIAG("table: %08x...%08x\n",cyg_httpd_table, cyg_httpd_table_end);
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/* Now scan the table for a matching entry. If we find one
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* call the handler routine. If that returns true then we
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* terminate the scan, otherwise we keep looking.
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*/
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while( entry != cyg_httpd_table_end )
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{
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HTTPD_DIAG("try %08x: %s\n", entry, entry->pattern);
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if( match( filename, entry->pattern ) )
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{
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if( (success = entry->handler( client, filename, formdata, entry->arg )) )
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break;
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}
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entry++;
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}
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| 247 |
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| 248 |
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/* If we failed to find a match in the table, send a "not
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| 249 |
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* found" response.
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| 250 |
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* TODO: add an optional fallback to go look for files in
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| 251 |
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* some filesystem, somewhere.
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*/
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if( !success )
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cyg_httpd_send_html( client, NULL, NULL, cyg_httpd_not_found );
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| 256 |
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/* All done, close the connection
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| 257 |
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*/
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| 258 |
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err = fclose( client );
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| 259 |
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CYG_ASSERT( err == 0, "fclose() returned error");
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| 261 |
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} while(1);
|
| 262 |
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}
|
| 263 |
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| 264 |
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/* ================================================================= */
|
| 265 |
|
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/* Initialization thread
|
| 266 |
|
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*
|
| 267 |
|
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* Optionally delay for a time before getting the network
|
| 268 |
|
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* running. Then create and bind the server socket and put it into
|
| 269 |
|
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* listen mode. Spawn any further server threads, then enter server
|
| 270 |
|
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* mode.
|
| 271 |
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*/
|
| 272 |
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| 273 |
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static void cyg_httpd_init(cyg_addrword_t arg)
|
| 274 |
|
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{
|
| 275 |
|
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int i;
|
| 276 |
|
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int err = 0;
|
| 277 |
|
|
|
| 278 |
|
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/* Delay for a configurable length of time to give the application
|
| 279 |
|
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* a chance to get going, or even complete, without interference
|
| 280 |
|
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* from the HTTPD.
|
| 281 |
|
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*/
|
| 282 |
|
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if( CYGNUM_HTTPD_SERVER_DELAY > 0 )
|
| 283 |
|
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{
|
| 284 |
|
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cyg_thread_delay( CYGNUM_HTTPD_SERVER_DELAY );
|
| 285 |
|
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}
|
| 286 |
|
|
|
| 287 |
|
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server_address.sin_family = AF_INET;
|
| 288 |
|
|
server_address.sin_len = sizeof(server_address);
|
| 289 |
|
|
server_address.sin_addr.s_addr = INADDR_ANY;
|
| 290 |
|
|
server_address.sin_port = htons(CYGNUM_HTTPD_SERVER_PORT);
|
| 291 |
|
|
|
| 292 |
|
|
/* Get the network going. This is benign if the application has
|
| 293 |
|
|
* already done this.
|
| 294 |
|
|
*/
|
| 295 |
|
|
init_all_network_interfaces();
|
| 296 |
|
|
|
| 297 |
|
|
/* Create and bind the server socket.
|
| 298 |
|
|
*/
|
| 299 |
|
|
server_socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );
|
| 300 |
|
|
CYG_ASSERT( server_socket > 0, "Socket create failed");
|
| 301 |
|
|
|
| 302 |
|
|
err = bind( server_socket, (struct sockaddr *)&server_address,
|
| 303 |
|
|
sizeof(server_address) );
|
| 304 |
|
|
CYG_ASSERT( err == 0, "bind() returned error");
|
| 305 |
|
|
|
| 306 |
|
|
err = listen( server_socket, SOMAXCONN );
|
| 307 |
|
|
CYG_ASSERT( err == 0, "listen() returned error" );
|
| 308 |
|
|
|
| 309 |
|
|
/* If we are configured to have more than one server thread,
|
| 310 |
|
|
* create them now.
|
| 311 |
|
|
*/
|
| 312 |
|
|
for( i = 1; i < CYGNUM_HTTPD_THREAD_COUNT; i++ )
|
| 313 |
|
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{
|
| 314 |
|
|
cyg_thread_create( CYGNUM_HTTPD_THREAD_PRIORITY,
|
| 315 |
|
|
cyg_httpd_server,
|
| 316 |
|
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0,
|
| 317 |
|
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"HTTPD",
|
| 318 |
|
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&httpd_stacks[i][0],
|
| 319 |
|
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sizeof(httpd_stacks[i]),
|
| 320 |
|
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&httpd_thread[i],
|
| 321 |
|
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&httpd_thread_object[i]
|
| 322 |
|
|
);
|
| 323 |
|
|
|
| 324 |
|
|
cyg_thread_resume( httpd_thread[i] );
|
| 325 |
|
|
}
|
| 326 |
|
|
|
| 327 |
|
|
/* Now go be a server ourself.
|
| 328 |
|
|
*/
|
| 329 |
|
|
cyg_httpd_server(arg);
|
| 330 |
|
|
}
|
| 331 |
|
|
|
| 332 |
|
|
/* ================================================================= */
|
| 333 |
|
|
/* System initializer
|
| 334 |
|
|
*
|
| 335 |
|
|
* This is called from the static constructor in init.cxx. It spawns
|
| 336 |
|
|
* the main server thread and makes it ready to run.
|
| 337 |
|
|
*/
|
| 338 |
|
|
|
| 339 |
|
|
__externC void cyg_httpd_startup(void)
|
| 340 |
|
|
{
|
| 341 |
|
|
cyg_thread_create( CYGNUM_HTTPD_THREAD_PRIORITY,
|
| 342 |
|
|
cyg_httpd_init,
|
| 343 |
|
|
0,
|
| 344 |
|
|
"HTTPD",
|
| 345 |
|
|
&httpd_stacks[0][0],
|
| 346 |
|
|
sizeof(httpd_stacks[0]),
|
| 347 |
|
|
&httpd_thread[0],
|
| 348 |
|
|
&httpd_thread_object[0]
|
| 349 |
|
|
);
|
| 350 |
|
|
|
| 351 |
|
|
cyg_thread_resume( httpd_thread[0] );
|
| 352 |
|
|
}
|
| 353 |
|
|
|
| 354 |
|
|
/* ================================================================= */
|
| 355 |
|
|
/* HTTP protocol handling
|
| 356 |
|
|
*
|
| 357 |
|
|
* cyg_http_start() generates an HTTP header with the given content
|
| 358 |
|
|
* type and, if non-zero, length.
|
| 359 |
|
|
* cyg_http_finish() just adds a couple of newlines for luck and
|
| 360 |
|
|
* flushes the stream.
|
| 361 |
|
|
*/
|
| 362 |
|
|
|
| 363 |
|
|
__externC void cyg_http_start( FILE *client, char *content_type,
|
| 364 |
|
|
int content_length )
|
| 365 |
|
|
{
|
| 366 |
|
|
fputs( "HTTP/1.1 200 OK\n"
|
| 367 |
|
|
"Server: " CYGDAT_HTTPD_SERVER_ID,
|
| 368 |
|
|
client );
|
| 369 |
|
|
|
| 370 |
|
|
if( content_type != NULL )
|
| 371 |
|
|
fprintf( client,"Content-type: %s\n", content_type );
|
| 372 |
|
|
|
| 373 |
|
|
if( content_length != 0 )
|
| 374 |
|
|
fprintf( client, "Content-length: %d\n", content_length );
|
| 375 |
|
|
|
| 376 |
|
|
fputs( "Connection: close\n"
|
| 377 |
|
|
"\n",
|
| 378 |
|
|
client );
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
__externC void cyg_http_finish( FILE *client )
|
| 382 |
|
|
{
|
| 383 |
|
|
fputs( "\n\n", client );
|
| 384 |
|
|
fflush( client );
|
| 385 |
|
|
}
|
| 386 |
|
|
|
| 387 |
|
|
|
| 388 |
|
|
/* ================================================================= */
|
| 389 |
|
|
/* HTML tag generation
|
| 390 |
|
|
*
|
| 391 |
|
|
* These functions generate standard HTML begin and end tags. By using
|
| 392 |
|
|
* these rather than direct printf()s we help to reduce the number of
|
| 393 |
|
|
* distinct strings present in the executable.
|
| 394 |
|
|
*/
|
| 395 |
|
|
|
| 396 |
|
|
__externC void cyg_html_tag_begin( FILE *client, char *tag, char *attr )
|
| 397 |
|
|
{
|
| 398 |
|
|
char *pad = "";
|
| 399 |
|
|
|
| 400 |
|
|
if( attr == NULL )
|
| 401 |
|
|
attr = pad;
|
| 402 |
|
|
else if( attr[0] != 0 )
|
| 403 |
|
|
pad = " ";
|
| 404 |
|
|
|
| 405 |
|
|
fprintf(client, "<%s%s%s>\n",tag,pad,attr);
|
| 406 |
|
|
}
|
| 407 |
|
|
|
| 408 |
|
|
__externC void cyg_html_tag_end( FILE *client, char *tag )
|
| 409 |
|
|
{
|
| 410 |
|
|
fprintf( client, "<%s%s%s>\n","/",tag,"");
|
| 411 |
|
|
}
|
| 412 |
|
|
|
| 413 |
|
|
/* ================================================================= */
|
| 414 |
|
|
/* Parse form request data
|
| 415 |
|
|
*
|
| 416 |
|
|
* Given a form response string, we parse it into an argv/environment
|
| 417 |
|
|
* style array of "name=value" strings. We also convert any '+'
|
| 418 |
|
|
* separators back into spaces.
|
| 419 |
|
|
*
|
| 420 |
|
|
* TODO: also translate any %xx escape sequences back into real
|
| 421 |
|
|
* characters.
|
| 422 |
|
|
*/
|
| 423 |
|
|
|
| 424 |
|
|
__externC void cyg_formdata_parse( char *data, char *list[], int size )
|
| 425 |
|
|
{
|
| 426 |
|
|
char *p = data;
|
| 427 |
|
|
int i = 0;
|
| 428 |
|
|
|
| 429 |
|
|
list[i] = p;
|
| 430 |
|
|
|
| 431 |
|
|
while( *p != 0 && i < size-1 )
|
| 432 |
|
|
{
|
| 433 |
|
|
if( *p == '&' )
|
| 434 |
|
|
{
|
| 435 |
|
|
*p++ = 0;
|
| 436 |
|
|
list[++i] = p;
|
| 437 |
|
|
continue;
|
| 438 |
|
|
}
|
| 439 |
|
|
if( *p == '+' )
|
| 440 |
|
|
*p = ' ';
|
| 441 |
|
|
p++;
|
| 442 |
|
|
}
|
| 443 |
|
|
|
| 444 |
|
|
list[++i] = 0;
|
| 445 |
|
|
}
|
| 446 |
|
|
|
| 447 |
|
|
/* ----------------------------------------------------------------- */
|
| 448 |
|
|
/* Search for a form response value
|
| 449 |
|
|
*
|
| 450 |
|
|
* Search a form response list generated by cyg_formdata_parse() for
|
| 451 |
|
|
* the named element. If it is found a pointer to the value part is
|
| 452 |
|
|
* returned. If it is not found a NULL pointer is returned.
|
| 453 |
|
|
*/
|
| 454 |
|
|
|
| 455 |
|
|
__externC char *cyg_formlist_find( char *list[], char *name )
|
| 456 |
|
|
{
|
| 457 |
|
|
while( *list != 0 )
|
| 458 |
|
|
{
|
| 459 |
|
|
char *p = *list;
|
| 460 |
|
|
char *q = name;
|
| 461 |
|
|
|
| 462 |
|
|
while( *p == *q )
|
| 463 |
|
|
p++, q++;
|
| 464 |
|
|
|
| 465 |
|
|
if( *q == 0 && *p == '=' )
|
| 466 |
|
|
return p+1;
|
| 467 |
|
|
|
| 468 |
|
|
list++;
|
| 469 |
|
|
}
|
| 470 |
|
|
|
| 471 |
|
|
return 0;
|
| 472 |
|
|
}
|
| 473 |
|
|
|
| 474 |
|
|
/* ================================================================= */
|
| 475 |
|
|
/* Predefined page handlers
|
| 476 |
|
|
*/
|
| 477 |
|
|
|
| 478 |
|
|
/* ----------------------------------------------------------------- */
|
| 479 |
|
|
/* Send an HTML page from a single string
|
| 480 |
|
|
*
|
| 481 |
|
|
* This just sends the string passed as the argument with an HTTP
|
| 482 |
|
|
* header that describes it as HTML. This is useful for sending
|
| 483 |
|
|
* straightforward static web content.
|
| 484 |
|
|
*/
|
| 485 |
|
|
|
| 486 |
|
|
__externC cyg_bool cyg_httpd_send_html( FILE *client, char *filename,
|
| 487 |
|
|
char *request, void *arg )
|
| 488 |
|
|
{
|
| 489 |
|
|
html_begin( client );
|
| 490 |
|
|
|
| 491 |
|
|
fwrite( arg, 1, strlen((char *)arg), client );
|
| 492 |
|
|
|
| 493 |
|
|
html_end( client );
|
| 494 |
|
|
|
| 495 |
|
|
return true;
|
| 496 |
|
|
}
|
| 497 |
|
|
|
| 498 |
|
|
/* ----------------------------------------------------------------- */
|
| 499 |
|
|
/* Send arbitrary data
|
| 500 |
|
|
*
|
| 501 |
|
|
* This takes a pointer to a cyg_httpd_data structure as the argument
|
| 502 |
|
|
* and sends the data therein after a header that uses the content
|
| 503 |
|
|
* type and size from the structure. This is useful for non-HTML data
|
| 504 |
|
|
* such a images.
|
| 505 |
|
|
*/
|
| 506 |
|
|
|
| 507 |
|
|
__externC cyg_bool cyg_httpd_send_data( FILE *client, char *filename,
|
| 508 |
|
|
char *request, void *arg )
|
| 509 |
|
|
{
|
| 510 |
|
|
cyg_httpd_data *data = (cyg_httpd_data *)arg;
|
| 511 |
|
|
|
| 512 |
|
|
cyg_http_start( client, data->content_type, data->content_length );
|
| 513 |
|
|
|
| 514 |
|
|
fwrite( data->data, 1, data->content_length, client );
|
| 515 |
|
|
|
| 516 |
|
|
return true;
|
| 517 |
|
|
}
|
| 518 |
|
|
|
| 519 |
|
|
/* ----------------------------------------------------------------- */
|
| 520 |
|
|
/* end of httpd.c */
|
