如何编写一个Web服务器？

1jjk

原帖由 "mq110" 发表：
不解析动态页的话.
那么就是监听端口.然后有请求后就发相应的html文件给客户.

这样的话 临时文件就多了，然后可以用删除文件的函数将临时文件删除，是这样吧？
110前辈？

mq110

原帖由 "1jjk" 发表：



这样的话 临时文件就多了，然后可以用删除文件的函数将临时文件删除，是这样吧？
110前辈？

别叫前辈.我昏. 这里的人大部分都是我的老师.
你说的问题 再详细描述一下吧?

airsupplyp2p

网上我看见有很多用JaVA做的WEb 服务器，你可以看一下

assiss

sourceforge上有一些tiny httpd之类的程序可供参考。

lvshishi

mq110 ，请问，如果同时有多个连接，该如何处理？当用户连接上以后，能不能将它的访问锁定在一个目录，而不是发送html？

mq110

>;>;如果同时有多个连接，该如何处理？

多进程 或着多线程处理.

>;>;能不能将它的访问锁定在一个目录

这个需要应用程序自己处理http报文了.非法的访问都是不允许的.~
http协议俺了解的也不多.你找些资料吧.

1jjk

去
bsd站里可能有

shappen

这个可能会符合你的要求

http://sourceforge.net/projects/nullhttpd

ge126

C程序
监听端口
有连接，产成自进程（如果你从windows过来的话用线程），线程处理请求

怎么处理，取决要求了。如果只是简单的浏览下载，那简单了，查找GET字符，查看后面的请求路径，找到对应路径，定义几个错误信息，如果没找到就返回错误信息（用HTTP头封装一下）。

随便找本书吧，很简单的，200行代码就解决。很多书上有例子。

qing

http://www.acme.com/software/micro_httpd/

/* micro_httpd - really small HTTP server
**
** Copyright © 1999 by Jef Poskanzer <jef@mail.acme.com>;.
** 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.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/

#include <unistd.h>;
#include <stdlib.h>;
#include <stdio.h>;
#include <string.h>;
#include <sys/types.h>;
#include <sys/stat.h>;
#include <sys/time.h>;

#define SERVER_NAME "micro_httpd"
#define SERVER_URL "http://www.acme.com/software/micro_httpd/"
#define PROTOCOL "HTTP/1.0"
#define RFC1123FMT "%a, %d %b %Y %H:%M:%S GMT"

/* Forwards. */
static void send_error( int status, char* title, char* extra_header, char* text );
static void send_headers( int status, char* title, char* extra_header, char* mime_type, off_t length, time_t mod );
static char* get_mime_type( char* name );

int
main( int argc, char** argv )
    {
    char line[10000], method[10000], path[10000], protocol[10000], idx[20000], location[20000], command[20000];
    char* file;
    size_t len;
    int ich;
    struct stat sb;
    FILE* fp;

    if ( argc != 2 )
        send_error( 500, "Internal Error", (char*) 0, "Config error - no dir specified." );
    if ( chdir( argv[1] ) < 0 )
        send_error( 500, "Internal Error", (char*) 0, "Config error - couldn't chdir()." );
    if ( fgets( line, sizeof(line), stdin ) == (char*) 0 )
        send_error( 400, "Bad Request", (char*) 0, "No request found." );
    if ( sscanf( line, "%[^ ] %[^ ] %[^ ]", method, path, protocol ) != 3 )
        send_error( 400, "Bad Request", (char*) 0, "Can't parse request." );
    while ( fgets( line, sizeof(line), stdin ) != (char*) 0 )
        {
        if ( strcmp( line, "\n" ) == 0 || strcmp( line, "\r\n" ) == 0 )
            break;
        }
    if ( strcasecmp( method, "get" ) != 0 )
        send_error( 501, "Not Implemented", (char*) 0, "That method is not implemented." );
    if ( path[0] != '/' )
        send_error( 400, "Bad Request", (char*) 0, "Bad filename." );
    file = &(path[1]);
    if ( file[0] == '\0' )
        file = "./";
    len = strlen( file );
    if ( file[0] == '/' || strcmp( file, ".." ) == 0 || strncmp( file, "../", 3 ) == 0 || strstr( file, "/../" ) != (char*) 0 || strcmp( &(file[len-3]), "/.." ) == 0 )
        send_error( 400, "Bad Request", (char*) 0, "Illegal filename." );
    if ( stat( file, &sb ) < 0 )
        send_error( 404, "Not Found", (char*) 0, "File not found." );
    if ( S_ISDIR( sb.st_mode ) )
        {
        if ( file[len-1] != '/' )
            {
            (void) snprintf(
                location, sizeof(location), "Location: %s/", path );
            send_error( 302, "Found", location, "Directories must end with a slash." );
            }
        (void) snprintf( idx, sizeof(idx), "%sindex.html", file );
        if ( stat( idx, &sb ) >;= 0 )
            {
            file = idx;
            goto do_file;
            }
        send_headers( 200, "Ok", (char*) 0, "text/html", -1, sb.st_mtime );
        (void) printf( "<HTML>;<HEAD>;<TITLE>;Index of %s</TITLE>;</HEAD>;\n<BODY BGCOLOR=\"#99cc99\">;<H4>;Index of %s</H4>;\n<RE>;\n", file, file );
        if ( strchr( file, '\'' ) == (char*) 0 )
            {
            (void) snprintf( command, sizeof(command),
                "ls -lgF '%s' | tail +2 | sed -e 's/^\\([^ ][^ ]*\\)\\(  *[^ ][^ ]*  *[^ ][^ ]*  *[^ ][^ ]*\\)\\(  *[^ ][^ ]*\\)  *\\([^ ][^ ]*  *[^ ][^ ]*  *[^ ][^ ]*\\)  *\\(.*\\)$/\\1 \\3  \\4  |\\5/' -e '/ ->; /!s,|\\([^*]*\\)$,|<A HREF=\"\\1\">;\\1</A>;,' -e '/ ->; /!s,|\\(.*\\)\\(

\\)$,|<A HREF=\"\\1\">;\\1</A>;\\2,' -e '/ ->; /s,|\\([^@]*\\)\\(@* ->; \\),|<A HREF=\"\\1\">;\\1</A>;\\2,' -e 's/|//'",
                file );
            (void) fflush( stdout );
            system( command );
            }
        (void) printf( "</PRE>;\n<HR>;\n<ADDRESS>;<A HREF=\"%s\">;%s</A>;</ADDRESS>;\n</BODY>;</HTML>;\n", SERVER_URL, SERVER_NAME );
        }
    else
        {
        do_file:
        fp = fopen( file, "r" );
        if ( fp == (FILE*) 0 )
            send_error( 403, "Forbidden", (char*) 0, "File is protected." );
        send_headers( 200, "Ok", (char*) 0, get_mime_type( file ), sb.st_size, sb.st_mtime );
        while ( ( ich = getc( fp ) ) != EOF )
            putchar( ich );
        }

    (void) fflush( stdout );
    exit( 0 );
    }

static void
send_error( int status, char* title, char* extra_header, char* text )
    {
    send_headers( status, title, extra_header, "text/html", -1, -1 );
    (void) printf( "<HTML>;<HEAD>;<TITLE>;%d %s</TITLE>;</HEAD>;\n<BODY BGCOLOR=\"#cc9999\">;<H4>;%d %s</H4>;\n", status, title, status, title );
    (void) printf( "%s\n", text );
    (void) printf( "<HR>;\n<ADDRESS>;<A HREF=\"%s\">;%s</A>;</ADDRESS>;\n</BODY>;</HTML>;\n", SERVER_URL, SERVER_NAME );
    (void) fflush( stdout );
    exit( 1 );
    }

static void
send_headers( int status, char* title, char* extra_header, char* mime_type, off_t length, time_t mod )
    {
    time_t now;
    char timebuf[100];

    (void) printf( "%s %d %s\015\012", PROTOCOL, status, title );
    (void) printf( "Server: %s\015\012", SERVER_NAME );
    now = time( (time_t*) 0 );
    (void) strftime( timebuf, sizeof(timebuf), RFC1123FMT, gmtime( &now ) );
    (void) printf( "Date: %s\015\012", timebuf );
    if ( extra_header != (char*) 0 )
        (void) printf( "%s\015\012", extra_header );
    if ( mime_type != (char*) 0 )
        (void) printf( "Content-Type: %s\015\012", mime_type );
    if ( length >;= 0 )
        (void) printf( "Content-Length: %lld\015\012", (int64_t) length );
    if ( mod != (time_t) -1 )
        {
        (void) strftime( timebuf, sizeof(timebuf), RFC1123FMT, gmtime( &mod ) );
        (void) printf( "Last-Modified: %s\015\012", timebuf );
        }
    (void) printf( "Connection: close\015\012" );
    (void) printf( "\015\012" );
    }

static char* get_mime_type( char* name )
    {
    char* dot;

    dot = strrchr( name, '.' );
    if ( dot == (char*) 0 )
        return "text/plain; charset=iso-8859-1";
    if ( strcmp( dot, ".html" ) == 0 || strcmp( dot, ".htm" ) == 0 )
        return "text/html; charset=iso-8859-1";
    if ( strcmp( dot, ".jpg" ) == 0 || strcmp( dot, ".jpeg" ) == 0 )
        return "image/jpeg";
    if ( strcmp( dot, ".gif" ) == 0 )
        return "image/gif";
    if ( strcmp( dot, ".png" ) == 0 )
        return "image/png";
    if ( strcmp( dot, ".css" ) == 0 )
        return "text/css";
    if ( strcmp( dot, ".au" ) == 0 )
        return "audio/basic";
    if ( strcmp( dot, ".wav" ) == 0 )
        return "audio/wav";
    if ( strcmp( dot, ".avi" ) == 0 )
        return "video/x-msvideo";
    if ( strcmp( dot, ".mov" ) == 0 || strcmp( dot, ".qt" ) == 0 )
        return "video/quicktime";
    if ( strcmp( dot, ".mpeg" ) == 0 || strcmp( dot, ".mpe" ) == 0 )
        return "video/mpeg";
    if ( strcmp( dot, ".vrml" ) == 0 || strcmp( dot, ".wrl" ) == 0 )
        return "model/vrml";
    if ( strcmp( dot, ".midi" ) == 0 || strcmp( dot, ".mid" ) == 0 )
        return "audio/midi";
    if ( strcmp( dot, ".mp3" ) == 0 )
        return "audio/mpeg";
    if ( strcmp( dot, ".pac" ) == 0 )
        return "application/x-ns-proxy-autoconfig";
    return "text/plain; charset=iso-8859-1";
    }