1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* 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
|
