decode_ftp.c

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/*
 * decode_ftp.c
 *
 * File Transfer Protocol.
 *
 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
 *
 * $Id: decode_ftp.c,v 1.7 2001/03/15 08:32:59 dugsong Exp $
 */
 
#include "config.h"
 
#include <sys/types.h>
 
#include <stdio.h>
#include <string.h>
 
#include "options.h"
#include "buf.h"
#include "decode.h"
 
int
decode_ftp(u_char *buf, int len, u_char *obuf, int olen)
{
    struct buf *line, inbuf, outbuf;
    int i, n;
 
    if ((len = strip_telopts(buf, len)) == 0)
        return (0);
 
    buf_init(&inbuf, buf, len);
    buf_init(&outbuf, obuf, olen);
 
    if (!buf_isascii(&inbuf))
        return (0);
 
    n = 0;
    
    while ((i = buf_index(&inbuf, "\n", 1)) != -1) {
        line = buf_tok(&inbuf, NULL, i);
        buf_skip(&inbuf, 1);
 
        if (i > 0 && line->base[i - 1] == '\r')
            line->end--;
        line->base[line->end] = '\0';
 
        if (strncasecmp(buf_ptr(line), "USER ", 5) == 0 ||
            strncasecmp(buf_ptr(line), "ACCT ", 5) == 0 ||
            strncasecmp(buf_ptr(line), "PASS ", 5) == 0) {
            buf_putf(&outbuf, "%s\n", buf_ptr(line));
            n++;
        }
    }
    if (n < 2) return (0);
 
    buf_end(&outbuf);
    
    return (buf_len(&outbuf));
}