unsigned long SendMemoryBlockAsFile
(
struct AmmServer_Instance * instance,
char * filename,
int clientsock, // The socket that will be used to send the data
//char * path, // The filename to be served on the socket above
char * mem, // The memory block body to be sent
unsigned long mem_block // The size of the memory block to be sent
)
{
if (! SendSuccessCodeHeader(instance,clientsock,200,filename)) { fprintf(stderr,"Failed sending success code \n"); return 0; }
char reply_header[MAX_HTTP_REQUEST_HEADER_REPLY+1]={0};
snprintf(reply_header,MAX_HTTP_REQUEST_HEADER_REPLY,"Content-length: %u\nConnection: close\n\n",(unsigned int) mem_block);
//TODO : Location : path etc
if (!SendPart(instance,clientsock,reply_header,strlen(reply_header)))
{ fprintf(stderr,"Failed sending content length @ SendMemoryBlockAsFile ..!\n"); }
if (!SendPart(instance,clientsock,mem,mem_block))
{ fprintf(stderr,"Failed sending content body @ SendMemoryBlockAsFile ..!\n"); }
return 0;
}
inline int TransmitFileHeaderToSocket(
struct AmmServer_Instance * instance,
int clientsock,
unsigned long start_at_byte, // Optionally start with an offset ( resume download functionality )
unsigned long end_at_byte, // Optionally end at an offset ( resume download functionality )
unsigned long lSize
)
{
char reply_header[MAX_HTTP_REQUEST_SHORT_HEADER_REPLY+1]={0};
//THIS ALSO EXISTS IN THE Cached resource response CODE around line 395
if ( (start_at_byte!=0) || (end_at_byte!=0) )
{
int endAtBytePrinted = end_at_byte;
if (endAtBytePrinted == 0 )
{ endAtBytePrinted = lSize; }
snprintf(reply_header,MAX_HTTP_REQUEST_SHORT_HEADER_REPLY,"Content-Range: bytes %lu-%u/%lu\nContent-length: %lu\n\n",start_at_byte,endAtBytePrinted,lSize,lSize-start_at_byte);
} else
{
//This is the last header part , so we are appending an extra \n to mark the end of the header
snprintf(reply_header,MAX_HTTP_REQUEST_SHORT_HEADER_REPLY,"Content-length: %u\n\n",(unsigned int) lSize);
}
if (!SendPart(instance,clientsock,reply_header,strlen(reply_header)))
{
fprintf(stderr,"Failed sending Content-length @ SendFile ..!\n");
return 0;
}
return 1;
}
int TransmitFileToSocket(
int clientsock,
char * verified_filename,
unsigned long start_at_byte, // Optionally start with an offset ( resume download functionality )
unsigned long end_at_byte // Optionally end at an offset ( resume download functionality )
)
{
FILE * pFile = fopen (verified_filename, "rb" );
if (pFile==0) { fprintf(stderr,"Could not open file %s , files open %u \n",verified_filename,files_open); return 0;}
++files_open;
// obtain file size:
if ( fseek (pFile , 0 , SEEK_END)!=0 )
{
warning("Could not find file size..!\nUnable to serve client\n");
fclose(pFile);
--files_open;
return 0;
}
unsigned long lSize = ftell (pFile);
if ( (end_at_byte!=0) && (lSize<end_at_byte) )
{ fprintf(stderr,"TODO: Handle incorrect range request ( from %u to %u file 0 to %u ..!\n",(unsigned int) start_at_byte,(unsigned int) end_at_byte,(unsigned int) lSize); }
fprintf(stderr,"Sending file %s , size %0.2f Kbytes , Open files %u \n",verified_filename,(double) lSize/1024,files_open);
char reply_header[MAX_HTTP_REQUEST_SHORT_HEADER_REPLY]={0};
//THIS ALSO EXISTS IN THE Cached resource response CODE around line 395
if ( (start_at_byte!=0) || (end_at_byte!=0) )
{
//error(" TransmitFileToSocket Content-Range response");
//Content-Range: bytes 1000-3979/3980
int endAtBytePrinted = end_at_byte;
if (endAtBytePrinted == 0 ) { endAtBytePrinted = lSize; }
snprintf(reply_header,MAX_HTTP_REQUEST_SHORT_HEADER_REPLY,"Content-Range: bytes %lu-%u/%lu\nContent-length: %lu\n\n",start_at_byte,endAtBytePrinted,lSize,lSize-start_at_byte);
} else
{
//error("TransmitFileToSocket Plain Content-Length ");
//This is the last header part , so we are appending an extra \n to mark the end of the header
snprintf(reply_header,MAX_HTTP_REQUEST_SHORT_HEADER_REPLY,"Content-length: %u\n\n",(unsigned int) lSize);
}
if (!SendPart(clientsock,reply_header,strlen(reply_header))) { fprintf(stderr,"Failed sending Content-length @ SendFile ..!\n"); }
rewind (pFile);
if (start_at_byte!=0) { fseek (pFile , start_at_byte , SEEK_SET); }
if (end_at_byte==0) { end_at_byte=lSize-start_at_byte; }
int res = TransmitFileToSocketInternal(pFile,clientsock,end_at_byte);
--files_open;
fclose (pFile);
return res;
}
unsigned long SendFile
(
struct AmmServer_Instance * instance,
struct HTTPTransaction * transaction,
char * verified_filename_pending_copy, // The filename to be served on the socket above
unsigned int force_error_code
)
{
int clientsock = transaction->clientSock;
unsigned int resourceCacheID=transaction->resourceCacheID;
unsigned long start_at_byte = transaction->incomingHeader.range_start;
unsigned long end_at_byte = transaction->incomingHeader.range_end;
unsigned char keepalive = transaction->incomingHeader.keepalive;
unsigned char compression_supported = transaction->incomingHeader.supports_compression ;
struct HTTPHeader * request = &transaction->incomingHeader;
char verified_filename[MAX_FILE_PATH+1]={0};
char reply_header[MAX_HTTP_REQUEST_HEADER_REPLY+1]={0};
if (verified_filename_pending_copy != 0)
{
strncpy(verified_filename,verified_filename_pending_copy,MAX_FILE_PATH);
}
/*! Start sending the header first..!
Due to error messages also having body payloads they are also handled here , creating
clutter in the code but this way there is no need to write the same thing twice..! !*/
/*! PRELIMINARY HEADER SENDING START ----------------------------------------------*/
unsigned int WeWantA200OK=0;
if (force_error_code!=0)
{
//We want to force a specific error_code!
if (! SendErrorCodeHeader(instance,clientsock,force_error_code,verified_filename,instance->templates_root) ) { fprintf(stderr,"Failed sending error code %u\n",force_error_code); return 0; }
} else
if (!FilenameStripperOk(verified_filename))
{
//Unsafe filename , bad request :P
if (! SendErrorCodeHeader(instance,clientsock,400,verified_filename,instance->templates_root) ) { fprintf(stderr,"Failed sending error code 400\n"); return 0; }
//verified_filename should now point to the template file for 400 messages
} else
{
//We have a legitimate file to send , if we want to send it all , we must emmit a 200 OK header
//if we are serving it with an offset , we must emmit a 206 OK header!
if ( (start_at_byte!=0) || (end_at_byte!=0) )
{
error("No checking on Range Provided is done , the underlying mechanisms are safe , but the header could potentially display wrong things ..");
error("We dont know the filesize yet so can't fix it here..");
//Range Accepted 206 OK header
if (! SendSuccessCodeHeader(instance,clientsock,206,verified_filename)) { fprintf(stderr,"Failed sending Range Acknowledged success code \n"); return 0; }
} else
{
//Normal 200 OK header
/*! TODO Reorganize this : THIS SHOULD NOT BE SENT YET , SINCE WE MAY WANT TO EMMIT A 304 Not Modified Header if content is unmodified..!*/
WeWantA200OK=1;
}
}
/*! PRELIMINARY HEADER SEND END ----------------------------------------------*/
struct cache_item * cache = (struct cache_item *) instance->cache;
int opres=0;
unsigned int index=0;
unsigned long cached_lSize=0;
unsigned char cached_buffer_is_compressed = compression_supported;
unsigned char free_cached_buffer_after_use=0;
unsigned char serveAsRegularFile=0;
char * cached_buffer = cache_GetResource(instance,request,resourceCacheID,verified_filename,MAX_FILE_PATH,&index,&cached_lSize,0,&cached_buffer_is_compressed,&free_cached_buffer_after_use,&serveAsRegularFile);
if (cached_buffer!=0) //If we have already a cached version of the file there is a change we might send a 304 Not Modified response
{
unsigned char ok_to_serve_not_modified = 1;
/*OK We have a cached buffer on this page BUT a good question to ask is the following..
Is it a regular file we are talking about , or a dynamic page ? */
if (cache[index].dynamicRequestCallbackFunction!=0)
{
/*It seems we have ourselves a dynamic page..! Are we on a callback cooldown ? */
/*The only built in way to serve a not modified response is if the request is too soon ( callback_every_x_msec callback cooldown ) ! */
struct AmmServer_RH_Context * shared_context = cache[index].dynamicRequest;
if ( shared_context->callback_cooldown ) { ok_to_serve_not_modified=1; } else // <- the dynamic page is still fresh.. so lets serve not modified..!
{ ok_to_serve_not_modified=0; } // <- the dynamic page has expired is dynamic so it can't be cached
} else
{
//It seems we have ourselves a regular page
//ok_to_serve_not_modified already should equal 1 so leave this here as documentation.. :P
}
//The application might want the file to always be served as a fresh one..
if ( cache[index].doNOTCacheRule ) { ok_to_serve_not_modified = 0; } /*We have written orders that we want this file to NEVER get cached.. EVER :P */
if (force_error_code!=0) { ok_to_serve_not_modified = 0; } /*We want 404 etc messages to remain 404 :P , no point in serving 404 and then 304 ( that the 404 didn't change )*/
if (ok_to_serve_not_modified)
{
//Check E-Tag here..!
unsigned int cache_etag = cache_GetHashOfResource(instance,index);
if ((request->eTag!=0)&&(cache_etag!=0))
{
char LocalETag[MAX_ETAG_SIZE]={0};
snprintf(LocalETag,MAX_ETAG_SIZE,"%u%u%lu%lu",instance->cacheVersionETag,cache_etag,start_at_byte,end_at_byte);
//fprintf(stderr,"E-Tag is `%s` , local hash is `%s` \n",request->eTag,LocalETag);
if ( strncmp(request->eTag,LocalETag,request->eTagLength)==0 )
{
fprintf(stderr,"The content matches our ETag , we will reply with 304 NOT MODIFIED! :) \n");
SendNotModifiedHeader(instance,clientsock);
//The Etag is mandatory on 304 messages..!
char ETagSendChunk[MAX_ETAG_SIZE+64]={0};
snprintf(ETagSendChunk,MAX_ETAG_SIZE+64,"ETag: \"%s\" \n",LocalETag);
if (!SendPart(instance,clientsock,ETagSendChunk,strlen(ETagSendChunk))) { fprintf(stderr,"Failed sending content length @ SendMemoryBlockAsFile ..!\n"); }
WeWantA200OK=0;
request->requestType=HEAD;
}
else
{
warning("eTag Mismatch\n"); // <- for now mismatches are probably bugs
}
}
}
}
unsigned int have_last_modified=0;
struct stat last_modified;
if ( WeWantA200OK )
{
if (! SendSuccessCodeHeader(instance,clientsock,200,verified_filename)) { fprintf(stderr,"Failed sending success code \n"); freeMallocIfNeeded(cached_buffer,free_cached_buffer_after_use); return 0; }
/* TODO : TEMPORARILY DISABLED LAST-MODIFIED :P
if (stat(verified_filename, &last_modified)) { fprintf(stderr,"Could not stat modification time for file %s\n",verified_filename); } else
{ have_last_modified=1; }*/
//TODO -> Check with last modified -> char * cached_buffer = CheckForCachedVersionOfThePage(request,verified_filename,&index,&cached_lSize,0,gzip_supported);
}
if (have_last_modified)
{
struct tm * ptm = gmtime ( &last_modified.st_mtime ); //This is not a particularly thread safe call , must add a mutex or something here..!
//Last-Modified: Sat, 29 May 2010 12:31:35 GMT
GetDateString(reply_header,MAX_HTTP_REQUEST_HEADER_REPLY,"Last-Modified",0,ptm->tm_wday,ptm->tm_mday,ptm->tm_mon,EPOCH_YEAR_IN_TM_YEAR+ptm->tm_year,ptm->tm_hour,ptm->tm_min,ptm->tm_sec);
opres=send(clientsock,reply_header,strlen(reply_header),MSG_WAITALL|MSG_NOSIGNAL); //Send filesize as soon as we've got it
if (opres<=0) { fprintf(stderr,"Error sending Last-Modified header \n"); freeMallocIfNeeded(cached_buffer,free_cached_buffer_after_use); return 0; }
}
//This used to also emmit --> Keep-Alive: timeout=5, max=100\n <--
/* RedBot says ( http://redbot.org/?uri=http%3A%2F%2Fammar.gr%3A8080%2F ) ..!
The Keep-Alive header is completely optional; it is defined primarily because the keep-alive connection token implies that such a header exists, not because anyone actually uses it.
Some implementations (e.g., Apache) do generate a Keep-Alive header to convey how many requests they're willing to serve on a single connection, what the connection timeout is and other information. However, this isn't usually used by clients.
It's safe to remove this header if you wish to save a few bytes in the response.*/
if (keepalive) { if (!SendPart(instance,clientsock,"Connection: keep-alive\n",strlen("Connection: keep-alive\n")) ) { /*TODO : HANDLE failure to send Connection: Keep-Alive */} } else
{ if (!SendPart(instance,clientsock,"Connection: close\n",strlen("Connection: close\n"))) { /*TODO : HANDLE failure to send Connection: Close */} }
if (request->requestType!=HEAD)
{
if ( (cached_buffer!=0) && //If we haven't got a buffer cached.. AND
( (!cache[index].doNOTCacheRule) /*If we dont forbid caching */ || ( (cache[index].doNOTCacheRule)&&(cache[index].dynamicRequestCallbackFunction!=0) ) /*Or we forbid caching but we are talking about a dynamic page*/)
) // its ok to serve a cached file..
{ /*!Serve cached file !*/
//if (gzip_supported) { strcat(reply_header,"Content-encoding: gzip\n"); } // Cache can serve gzipped files
//Last-Modified: Sat, 29 May 2010 12:31:35 GMT
//GetDateString(reply_header,"Date",1,0,0,0,0,0,0,0);
unsigned int cache_etag = cache_GetHashOfResource(instance,index);
if (cache_etag!=0)
{
snprintf(reply_header,MAX_HTTP_REQUEST_HEADER_REPLY,"ETag: \"%u%u%lu%lu\"\n", instance->cacheVersionETag,cache_etag,start_at_byte,end_at_byte);
opres=ASRV_Send(instance,clientsock,reply_header,strlen(reply_header),MSG_WAITALL|MSG_NOSIGNAL); //Send E-Tag as soon as we've got it
if (opres<=0) { fprintf(stderr,"Error sending ETag header \n"); freeMallocIfNeeded(cached_buffer,free_cached_buffer_after_use); return 0; }
}
if (cached_lSize==0) { warning("Bug(?) detected , zero cache payload\n"); }
if ( cached_buffer_is_compressed )
{
strncpy(reply_header,"Content-Encoding: deflate\n",MAX_HTTP_REQUEST_HEADER_REPLY);
opres=ASRV_Send(instance,clientsock,reply_header,strlen(reply_header),MSG_WAITALL|MSG_NOSIGNAL); //Send E-Tag as soon as we've got it
if (opres<=0) { fprintf(stderr,"Error sending Compression header \n"); freeMallocIfNeeded(cached_buffer,free_cached_buffer_after_use); return 0; }
}
//THIS ALSO EXISTS IN THE TransmitFileToSocket CODE
//Send Content Length , as a range , or as the whole file!
if ( (start_at_byte!=0) || (end_at_byte!=0) )
{
//error("Resource Content-Range response");
//Content-Range: bytes 1000-3979/3980
int endAtBytePrinted = end_at_byte;
if (endAtBytePrinted == 0 ) { endAtBytePrinted = cached_lSize; }
snprintf(reply_header,MAX_HTTP_REQUEST_HEADER_REPLY,"Content-Range: bytes %lu-%u/%lu\nContent-length: %lu\n\n",start_at_byte,endAtBytePrinted,cached_lSize,cached_lSize-start_at_byte);
} else
{
//error("Resource Plain Content-Length ");
//This is the last header part , so we are appending an extra \n to mark the end of the header
snprintf(reply_header,MAX_HTTP_REQUEST_HEADER_REPLY,"Content-length: %u\n\n",(unsigned int) cached_lSize);
}
opres=ASRV_Send(instance,clientsock,reply_header,strlen(reply_header),MSG_WAITALL|MSG_NOSIGNAL); //Send filesize as soon as we've got it
if (opres<=0) { fprintf(stderr,"Error sending cached header \n"); freeMallocIfNeeded(cached_buffer,free_cached_buffer_after_use); return 0; }
opres=ASRV_Send(instance,clientsock,cached_buffer,cached_lSize,MSG_WAITALL|MSG_NOSIGNAL); //Send file as soon as we've got it
freeMallocIfNeeded(cached_buffer,free_cached_buffer_after_use);
if (opres<=0) { fprintf(stderr,"Error sending cached body\n"); return 0; }
return 1;
}
else
{
/*!Serve file by reading it from disk !*/
if ((cached_buffer==0)&&(cached_lSize==1)) { /*TODO : Cache indicates that file doesn't exist */ } else
if ((cached_buffer==0)&&(cached_lSize==0)) { /*TODO : Cache indicates that file is not in cache :P */ }
if ( !TransmitFileToSocket(instance,clientsock,verified_filename,start_at_byte,end_at_byte) )
{
fprintf(stderr,"Could not transmit file %s \n",verified_filename);
return 0;
}
return 1;
}
//
} //we also want a body with that header END
else
{
//We only served a header so lets append the last new line char..!
send(clientsock,"\n",strlen("\n"),MSG_WAITALL|MSG_NOSIGNAL);
return 1; //This does not mean we failed..! 2016-04-03
}
return 0;
}
