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/*
* lib/masq_info.c This file contains a the functio masq_info
* to print a table of current masquerade connections.
*
* NET-LIB A collection of functions used from the base set of the
* NET-3 Networking Distribution for the LINUX operating
* system. (net-tools, net-drivers)
*
* Version: $Id: masq_info.c,v 1.7 2000/10/08 01:00:44 ecki Exp $
*
* Author: Bernd 'eckes' Eckenfels <net-tools@lina.inka.de>
* Copyright 1999 Bernd Eckenfels, Germany
*
* Modifications:
*
*960217 {0.01} Bernd Eckenfels: creatin from the code of
* Jos Vos' ipfwadm 2.0beta1
*950218 {0.02} Bernd Eckenfels: <linux/if.h> added
*
*980405 {0.03} Arnaldo Carvalho: i18n CATGETS -> gettext
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <unistd.h>
#include "net-support.h"
#include "pathnames.h"
#include "version.h"
#include "config.h"
#include "intl.h"
#include "net-features.h"
#if HAVE_FW_MASQUERADE
struct masq {
unsigned long expires; /* Expiration timer */
char *proto; /* Which protocol are we talking? */
struct sockaddr_in src, dst; /* Source and destination IP addresses */
unsigned short sport, dport; /* Source and destination ports */
unsigned short mport; /* Masqueraded port */
unsigned long initseq; /* Add delta from this seq. on */
short delta; /* Delta in sequence numbers */
short pdelta; /* Delta in sequence numbers before last */
};
static struct aftype *ap; /* current address family */
static int has_pdelta;
static void print_masq(struct masq *ms, int numeric_host, int numeric_port,
int ext)
{
unsigned long minutes, seconds, sec100s;
printf("%-4s", ms->proto);
sec100s = ms->expires % 100L;
seconds = (ms->expires / 100L) % 60;
minutes = ms->expires / 6000L;
printf("%3ld:%02ld.%02ld ", minutes, seconds, sec100s);
if (ext > 1) {
if (has_pdelta)
printf("%10lu %5hd %5hd ", ms->initseq,
ms->delta, ms->pdelta);
else
printf("%10lu %5hd - ", ms->initseq,
ms->delta);
}
printf("%-20s ", ap->sprint((struct sockaddr *) &(ms->src), numeric_host));
printf("%-20s ", ap->sprint((struct sockaddr *) &(ms->dst), numeric_host));
printf("%s -> ", get_sname(ms->sport, ms->proto, numeric_port));
printf("%s", get_sname(ms->dport, ms->proto, numeric_port));
printf(" (%s)\n", get_sname(ms->mport, ms->proto, numeric_port));
}
static int read_masqinfo(FILE * f, struct masq *mslist, int nmslist)
{
int n, nread = 0;
struct masq *ms;
char buf[256];
for (nread = 0; nread < nmslist; nread++) {
ms = &mslist[nread];
if (has_pdelta) {
if ((n = fscanf(f, " %s %lX:%hX %lX:%hX %hX %lX %hd %hd %lu",
buf,
(unsigned long *) &ms->src.sin_addr.s_addr, &ms->sport,
(unsigned long *) &ms->dst.sin_addr.s_addr, &ms->dport,
&ms->mport, &ms->initseq, &ms->delta,
&ms->pdelta, &ms->expires)) == -1)
return nread;
} else {
if ((n = fscanf(f, " %s %lX:%hX %lX:%hX %hX %lX %hd %lu",
buf,
(unsigned long *) &ms->src.sin_addr.s_addr, &ms->sport,
(unsigned long *) &ms->dst.sin_addr.s_addr, &ms->dport,
&ms->mport, &ms->initseq, &ms->delta,
&ms->expires)) == -1)
return nread;
}
if ((has_pdelta && (n != 10)) || (!has_pdelta && (n != 9))) {
EINTERN("masq_info.c", "ip_masquerade format error");
return (-1);
}
ms->src.sin_family = AF_INET;
ms->dst.sin_family = AF_INET;
if (strcmp("TCP", buf) == 0)
ms->proto = "tcp";
else if (strcmp("UDP", buf) == 0)
ms->proto = "udp";
else if (strcmp("ICMP", buf) == 0)
ms->proto = "icmp";
else if (strcmp("GRE", buf) == 0)
ms->proto = "gre";
else if (strcmp("ESP", buf) == 0)
ms->proto = "esp";
else {
EINTERN("masq_info.c", "ip_masquerade unknown type");
return (-1);
}
/* we always keep these addresses in network byte order */
ms->src.sin_addr.s_addr = htonl(ms->src.sin_addr.s_addr);
ms->dst.sin_addr.s_addr = htonl(ms->dst.sin_addr.s_addr);
ms->sport = htons(ms->sport);
ms->dport = htons(ms->dport);
ms->mport = htons(ms->mport);
}
return nread;
}
int ip_masq_info(int numeric_host, int numeric_port, int ext)
{
FILE *f;
int i;
char buf[256];
struct masq *mslist;
int ntotal = 0, nread;
if (!(f = fopen(_PATH_PROCNET_IP_MASQ, "r"))) {
if (errno != ENOENT) {
perror(_PATH_PROCNET_IP_MASQ);
return (-1);
}
ESYSNOT("netstat", "ip_masquerade");
return (1);
}
if ((ap = get_aftype("inet")) == NULL) {
ENOSUPP("masq_info", "AF INET");
fclose(f);
return (-1);
}
fgets(buf, sizeof(buf), f);
has_pdelta = strstr(buf, "PDelta") ? 1 : 0;
mslist = (struct masq *) malloc(16 * sizeof(struct masq));
if (!mslist) {
EINTERN("masq_info", "malloc() failed");
fclose(f);
return (-1);
}
while ((nread = read_masqinfo(f, &(mslist[ntotal]), 16)) == 16) {
ntotal += nread;
mslist = (struct masq *) realloc(mslist,
(ntotal + 16) * sizeof(struct masq));
if (!mslist) {
EINTERN("masq_info", "realloc() failed");
fclose(f);
return (-1);
}
}
fclose(f);
if (nread < 0) {
if (mslist)
free(mslist);
return (-1);
}
ntotal += nread;
if (ntotal > 0) {
printf(_("IP masquerading entries\n"));
switch (ext) {
case 1:
printf(_("prot expire source destination ports\n"));
break;
default:
printf(_("prot expire initseq delta prevd source destination ports\n"));
break;
}
for (i = 0; i < ntotal; i++)
print_masq(&(mslist[i]), numeric_host, numeric_port, ext);
if (mslist)
free(mslist);
}
return 0;
}
#endif
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