Mail: fixed reading with fully filled buffer (ticket #2159). With SMTP pipelining, ngx_mail_read_command() can be called with s->buffer without any space available, to parse additional commands received to the buffer on previous calls. Previously, this resulted in recv() being called with zero length, resulting in zero being returned, which was interpreted as a connection close by the client, so nginx silently closed connection. Fix is to avoid calling c->recv() if there is no free space in the buffer, but continue parsing of the already received commands.

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_MD5_H_INCLUDED_
#define _NGX_MD5_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct {
    uint64_t  bytes;
    uint32_t  a, b, c, d;
    u_char    buffer[64];
} ngx_md5_t;


void ngx_md5_init(ngx_md5_t *ctx);
void ngx_md5_update(ngx_md5_t *ctx, const void *data, size_t size);
void ngx_md5_final(u_char result[16], ngx_md5_t *ctx);


#endif /* _NGX_MD5_H_INCLUDED_ */