decode_postgresql.c

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/*
 * decode_postgresql.c
 *
 * PostgreSQL.
 *
 * Thanks to Eric Jackson <shinobi@monkey.org> for packet traces.
 *
 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
 *
 * $Id: decode_postgresql.c,v 1.6 2001/03/15 08:33:02 dugsong Exp $
 */
 
#include "config.h"
 
#include <sys/types.h>
 
#include <stdio.h>
#include <string.h>
 
#include "decode.h"
 
#define STARTUP_PKTLEN  296
 
int
decode_postgresql(u_char *buf, int len, u_char *obuf, int olen)
{
    u_int32_t plen;
    u_char *p;
    char *db, *user;
    
    if (len < STARTUP_PKTLEN)
        return (0);
    
    obuf[0] = '\0';
    db = user = NULL;
    
    for (;;) {
        if (len < 4) break;
        plen = pntohl(buf);
        
        if (plen > len) break;
        p = buf + 4;
        
        if (plen == STARTUP_PKTLEN) {
            if (pntohl(p) >> 16 == 2) {
                db = p + 4; db[63] = '\0';
                user = db + 64; user[31] = '\0';
            }
        }
        else if (db != NULL && user != NULL) {
            buf[plen - 1] = '\0';
            snprintf(obuf + strlen(obuf),
                 olen - strlen(obuf),
                 "%s\n%s\n%s\n", db, user, p);
            db = user = NULL;
        }
        buf += plen;
        len -= plen;
    }
    return (strlen(obuf));
}