/******************************************************************************
* subroutine: process_request *
* purpose: handle a single request and return responses *
* parameters: id - the index of the client in the pool *
* p - a pointer of pool struct *
* is_closed - idicator if the transaction is closed *
* return: none *
******************************************************************************/
void process_request(int id, pool *p, int *is_closed)
{
HTTPContext *context = (HTTPContext *)calloc(1, sizeof(HTTPContext));
Log("Start processing request. \n");
// parse request line (get method, uri, version)
if (parse_requestline(id, p, context, is_closed) < 0) goto Done;
// check HTTP method (support GET, POST, HEAD now)
if (strcasecmp(context->method, "GET") &&
strcasecmp(context->method, "HEAD") &&
strcasecmp(context->method, "POST"))
{
*is_closed = 1;
serve_error(p->clientfd[id], "501", "Not Implemented",
"The method is not valid or not implemented by the server",
*is_closed);
goto Done;
}
// check HTTP version
if (strcasecmp(context->version, "HTTP/1.1"))
{
*is_closed = 1;
serve_error(p->clientfd[id], "505", "HTTP Version not supported",
"HTTP/1.0 is not supported by Liso server", *is_closed);
goto Done;
}
// parse uri (get filename and parameters if any)
parse_uri(context);
// parse request headers
if (parse_requestheaders(id, p, context, is_closed) < 0) goto Done;
// for POST, parse request body
if (!strcasecmp(context->method, "POST"))
if (parse_requestbody(id, p, context, is_closed) < 0) goto Done;
// send response
if (!strcasecmp(context->method, "GET"))
serve_get(p->clientfd[id], context, is_closed);
else if (!strcasecmp(context->method, "POST"))
serve_post(p->clientfd[id], context, is_closed);
else if (!strcasecmp(context->method, "HEAD"))
serve_head(p->clientfd[id], context, is_closed);
Done:
free(context);
Log("End of processing request. \n");
}
/*分析HTTP请求的入口函数 */
HTTP_CODE parse_content(char *buffer, int &checked_index, CHECK_STATE &checkstate,
int &read_index, int &start_line)
{
LINE_STATUS linestatus = LINE_OK; /*记录当前行的读取状态 */
HTTP_CODE retcode = NO_REQUEST; /*记录HTTP请求的处理结果 */
/*主状态机， 用于从buffer中取出所有完整的行 */
while((linestatus = parse_line(buffer, checked_index, read_index)) == LINE_OK)
{
char *temp = buffer + start_line; /*start_line 是行在buffer中的起始位置*/
start_line = checked_index; /*记录下一行的起始位置*/
/*checkstatus 记录主机状态当前的状态 */
switch(checkstate)
{
case CHECK_STATE_REQUESTLINE:
{
retcode = parse_requestline(temp, checkstate);
if (retcode == BAD_REQUEST)
{
return BAD_REQUEST;
}
break;
}
case CHECK_STATE_HEADER:
{
retcode = parse_headers(temp);
if (retcode == BAD_REQUEST)
{
return BAD_REQUEST;
}
else if (retcode == GET_REQUEST)
{
return GET_REQUEST;
}
break;
}
default:
{
return INTERNAL_ERROR;
}
}
}
/*若没有读取到一个完整的行， 则表示还需要继续读取客户数据才能进一步分析 */
if (linestatus == LINE_OPEN)
{
return NO_REQUEST;
}
else
{
return BAD_REQUEST;
}
}
HTTP_CODE parse_content( char* buffer, int& checked_index, CHECK_STATE& checkstate, int& read_index, int& start_line )
{
LINE_STATUS linestatus = LINE_OK;
HTTP_CODE retcode = NO_REQUEST;
while( ( linestatus = parse_line( buffer, checked_index, read_index ) ) == LINE_OK )
{
char* szTemp = buffer + start_line;
start_line = checked_index;
switch ( checkstate )
{
case CHECK_STATE_REQUESTLINE:
{
retcode = parse_requestline( szTemp, checkstate );
if ( retcode == BAD_REQUEST )
{
return BAD_REQUEST;
}
break;
}
case CHECK_STATE_HEADER:
{
retcode = parse_headers( szTemp );
if ( retcode == BAD_REQUEST )
{
return BAD_REQUEST;
}
else if ( retcode == GET_REQUEST )
{
return GET_REQUEST;
}
break;
}
default:
{
return INTERNAL_ERROR;
}
}
}
if( linestatus == LINE_OPEN )
{
return NO_REQUEST;
}
else
{
return BAD_REQUEST;
}
}
