server.cpp

UPnP的SDK源代码

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000 Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * 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.
// * Neither name of Intel Corporation nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 INTEL 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.
//
///////////////////////////////////////////////////////////////////////////

// $Revision: 1.1.1.4 $
// $Date: 2001/06/15 00:22:15 $

// readwrite.cpp
#include "../../inc/tools/config.h"
#ifdef INTERNAL_WEB_SERVER
#if EXCLUDE_WEB_SERVER == 0
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <genlib/util/util.h>
#include <genlib/util/xstring.h>
#include <genlib/util/dbllist.h>
#include <genlib/net/http/statuscodes.h>
#include <genlib/net/http/parseutil.h>
#include <genlib/net/http/readwrite.h>
#include <genlib/net/http/server.h>
#include <genlib/http_client/http_client.h>

#include <unistd.h>
#include <pthread.h>

#define SVRERR_FILE_NOT_FOUND -2
#define SVRERR_BAD_FORMAT     -3

CREATE_NEW_EXCEPTION_TYPE( HttpServerException, BasicException, "HttpServerException" )

//////////////////////////////////////////
struct AliasedEntity
{
    xstring alias;
    xstring contentType;
    xstring contentSubtype;
    time_t modifiedTime;
    HttpEntity* entity;
    int count;
    bool stopServing;
};

//////////////////////////////////////////////
CREATE_NEW_EXCEPTION_TYPE( AliasedListException, BasicException, "AliasedListException" )

//////////////////////////////////////////////
class AliasedEntityList
{
public:
    enum { E_SUCCESS = 0, E_NOT_FOUND = -2, E_DUPLICATE = -3,
        E_CANT_ADD = -5 };

public:
    // throws OutOfMemoryException
    AliasedEntityList();

    virtual ~AliasedEntityList();

    // adds the specified aliased entity to the list
    //
    // NOTE: 'entity' will be owned by the list
    // throws:
    //      OutOfMemoryException
    void addEntity( IN const char* alias, IN HttpEntity* entity,
        OUT xstring& actualAlias );

    // returns entity and its attributes
    //
    // throws:
    //      AliasListException.E_NOT_FOUND
    void grabEntity( IN const char* alias, OUT HttpEntity** entity,
        OUT xstring& contentType, OUT xstring& contentSubtype,
        OUT time_t& lastModifiedTime );

    // releases entity denoted by the alias
    //
    // stopServing: if true, future requests will return NOT FOUND
    //
    // throws:
    //      AliasListException.E_NOT_FOUND
    void releaseEntity( IN const char* alias, bool stopServing = false );

    // returns true if the aliased entity is in the list
    bool isAliasPresent( IN const char* alias );

private:
    // returns NULL if list node associated with alias is not found
    dblListNode* find( IN const char* alias );

private:
    dblList aliasList;      // = list<AliasedEntity>
    pthread_mutex_t mutex;
};

// *******************************************************
// module vars //////////////
// root directory of http server; must not have '/' at the end
static xstring gRootDocumentDir;
static bool    gServerActive = false;       // serve requests only when active
static AliasedEntityList gAliasList;
/////////////////////////////


///////////////////////////////////////////
static void Free_AliasedEntity( void* al_ent )
{
    AliasedEntity* ae = (AliasedEntity *)al_ent;

    assert( ae != NULL );
    assert( ae->entity != NULL );

    DBG(
        UpnpPrintf( UPNP_INFO, MSERV, __FILE__, __LINE__,
            "Deleting aliased entity %s\n", ae->alias.c_str()); )

    delete ae->entity;
    delete ae;
}

//////////////////////////////////////////////
static bool Compare_AliasedEntity( void *entityA, void* entityB )
{
    AliasedEntity *a = (AliasedEntity*) entityA;
    AliasedEntity *b = (AliasedEntity*) entityB;

    //DBG(
    //    printf("Compare alias: a = %s, b = %s\n",
    //        a->alias.c_str(), b->alias.c_str() );
    //)

    return a->alias == b->alias;
}

////////////////////////////////////////
// 1) adds leading '/' to entityName if it is absent
// 2) returns index of extension in string after the dot
//     index = -1 if no extension found
static int GetExtensionIndex( INOUT xstring& entityName )
{
    const char *ptr;
    const char *dot_ptr;
    const char *save_dot_ptr;
    int extensionIndex;

    // doc name starts after last '/'
    ptr = strrchr( entityName.c_str(), '/' );
    if ( ptr == NULL )
    {
        // no '/'; insert one at start
        entityName.insert( '/', 0 );

        ptr = entityName.c_str();
    }

    // precond: ptr points to last '/'
    assert( *ptr == '/' );

    //
    // look for last '.'
    //

    dot_ptr = ptr;
    save_dot_ptr = NULL;

    // scan left-to-right so that a dot before '/' is
    //  not detected accidentally
    while ( true )
    {
        dot_ptr = strchr( dot_ptr, '.' );
        if ( dot_ptr == NULL )
        {
            break;
        }
        save_dot_ptr = dot_ptr;
        dot_ptr++;  // skip dot
    }

    if ( save_dot_ptr == NULL )
    {
        // dot is not present
        extensionIndex = -1;
    }
    else
    {
        // determine index of dot in string
        extensionIndex = save_dot_ptr - entityName.c_str();
    }

    return extensionIndex;
}

struct FileExtensionType
{
    char* ext;
    char* type;
    char* subtype;
};

static char* AudioStr = "audio";
static char* VideoStr = "video";
static char* ImageStr = "image";
static char* ApplicationStr = "application";
static char* TextStr = "text";

#define NUM_MEDIA_TYPES 36
static FileExtensionType MediaTypeList[ NUM_MEDIA_TYPES ] =
{
    { "aif",  AudioStr,         "x-aiff" },
    { "au",   AudioStr,         "basic" },
    { "avi",  VideoStr,         "msvideo" },
    { "bmp",  ImageStr,         "x-MS-bmp"},
    { "gif",  ImageStr,         "gif" },

    { "htm",  TextStr,          "html" },
    { "html", TextStr,          "html" },

    { "jar",  ApplicationStr,   "java-archive" },
    { "jpeg", ImageStr,         "jpeg" },
    { "jpg",  ImageStr,         "jpeg" },
    { "jpe",  ImageStr,         "jpeg" },
    { "jfif", ImageStr,         "jpeg" },

    { "mid",  AudioStr,         "midi" },
    { "midi", AudioStr,         "midi" },
    { "mp3",  AudioStr,         "mp3"  },
    { "mpeg", VideoStr,         "mpeg" },
    { "mpg",  VideoStr,         "mpeg" },
    { "mpv",  VideoStr,         "mpeg" },
    { "mpe",  VideoStr,         "mpeg" },
    { "mov",  VideoStr,         "quicktime" },

    { "pdf",  ApplicationStr,   "pdf" },
    { "pjp",  ImageStr,         "jpeg" },
    { "pjpeg",ImageStr,         "jpeg" },
    { "png",  ImageStr,         "png" },

    { "qt",   VideoStr,         "quicktime" },

    { "ram",  AudioStr,         "x-pn-realaudio" },
    { "rmi",  AudioStr,         "mid"  },
    { "rmm",  AudioStr,         "x-pn-realaudio" },

    { "shtml",TextStr,          "html" },

    { "tar",  ApplicationStr,   "tar" },
    { "text", TextStr,          "plain" },
    { "txt",  TextStr,          "plain" },

    { "wav",  AudioStr,         "wav" },

    { "xml",  TextStr,          "xml" },
    { "xsl",  TextStr,          "xml" },

    { "zip",  ApplicationStr,   "zip" },
};

static int SearchExtension( IN const char* fileExtension,
    IN FileExtensionType* table, IN int size )
{
    int top, mid, bot;
    int cmp;
    top = 0;
    bot = size - 1;

    while ( top <= bot )
    {
        mid = ( top + bot ) / 2;
        cmp = strcasecmp( fileExtension, table[mid].ext );

        if ( cmp > 0 )
        {
            top = mid + 1;      // look below mid
        }
        else if ( cmp < 0 )
        {
            bot = mid - 1;      // look above mid
        }
        else    // cmp == 0
        {
            return mid; // match
        }
    }
    return -1;
}

// if fileExtension not found, type is application/octet-stream
static void GetMediaType( IN const char* fileExtension,
    OUT xstring& contentType, OUT xstring& contentSubtype )
{
    int index;

    index = SearchExtension( fileExtension, MediaTypeList,
        NUM_MEDIA_TYPES );

    if ( index == -1 )
    {
        contentType = ApplicationStr;
        contentType = "octet-stream";
    }
    else
    {
        FileExtensionType* ext;

        assert( index >= 0 && index < NUM_MEDIA_TYPES );
        ext = &MediaTypeList[index];
        contentType = ext->type;
        contentSubtype = ext->subtype;
    }
}


////////////////////////////////////////
// AliasedEntityList
////////////////////////////////////////
AliasedEntityList::AliasedEntityList()
    : aliasList( Free_AliasedEntity, Compare_AliasedEntity )
{
    if ( pthread_mutex_init(&mutex, NULL) != 0 )
    {
        throw OutOfMemoryException( "AliasedEntityList::AliasedEntityList()" );
    }
}

////////////////////////////////////////
AliasedEntityList::~AliasedEntityList()
{
    while ( pthread_mutex_destroy(&mutex) == EBUSY )
    {
        // highly unlikely -- but still possible to return EBUSY
        sleep( 1 );
    }
}

////////////////////////////////////////
void AliasedEntityList::addEntity( IN const char* alias,
    IN HttpEntity* entity, OUT xstring& actualAlias )
{
    dblListNode *node;
    AliasedEntity* ae;
    int eCode = 0;
    int dot_index;
    xstring contentType, contentSubtype;

    assert( alias != NULL );
    assert( entity != NULL );

    pthread_mutex_lock( &mutex );
    try
    {
        ae = new AliasedEntity;
        if ( ae == NULL )
        {
            throw -5;       // no mem
        }

        actualAlias = alias;

        dot_index = GetExtensionIndex( actualAlias );

        node = find( actualAlias.c_str() );
        if ( node != NULL )
        {
            // duplicate alias
            // add id to make it unique

            // allocated entity -- to -- integer string
            char buf[50];
            sprintf( buf, "-%u", (unsigned)ae );

            if ( dot_index == -1 )
            {
                actualAlias += buf; // no dot; append
            }
            else
            {
                actualAlias.insert( buf, dot_index );