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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
/*
* interface.c -- implements fetchmail 'interface' and 'monitor' commands
*
* This module was implemented by George M. Sipe <gsipe@mindspring.com>
* or <gsipe@acm.org> and is:
*
* Copyright (c) 1996,1997 by George M. Sipe - ALL RIGHTS RESERVED
*
* This 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; version 2, or (at your option) any later version.
*/
#if defined(linux) && !defined(INET6)
#include "config.h"
#include <stdio.h>
#include <string.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include "config.h"
#include "fetchmail.h"
#include "i18n.h"
typedef struct {
struct in_addr addr, dstaddr, netmask;
int rx_packets, tx_packets;
} ifinfo_t;
struct interface_pair_s {
struct in_addr interface_address;
struct in_addr interface_mask;
} *interface_pair;
static int _get_ifinfo_(int socket_fd, FILE *stats_file, const char *ifname,
ifinfo_t *ifinfo)
/* get active network interface information - return non-zero upon success */
{
int namelen = strlen(ifname);
struct ifreq request;
char *cp, buffer[256];
int found = 0;
int counts[4];
/* initialize result */
memset((char *) ifinfo, 0, sizeof(ifinfo_t));
/* get the packet I/O counts */
while (fgets(buffer, sizeof(buffer) - 1, stats_file)) {
for (cp = buffer; *cp && *cp == ' '; ++cp);
if (!strncmp(cp, ifname, namelen) &&
cp[namelen] == ':') {
cp += namelen + 1;
if (sscanf(cp, "%d %d %*d %*d %*d %d %*d %d %*d %*d"
" %*d %*d %d",counts, counts+1, counts+2,
counts+3,&found)>4) { /* found = dummy */
/* newer kernel with byte counts */
ifinfo->rx_packets=counts[1];
ifinfo->tx_packets=counts[3];
} else {
/* older kernel, no byte counts */
ifinfo->rx_packets=counts[0];
ifinfo->tx_packets=counts[2];
}
found = 1;
}
}
if (!found) return (FALSE);
/* see if the interface is up */
strcpy(request.ifr_name, ifname);
if (ioctl(socket_fd, SIOCGIFFLAGS, &request) < 0)
return(FALSE);
if (!(request.ifr_flags & IFF_RUNNING))
return(FALSE);
/* get the IP address */
strcpy(request.ifr_name, ifname);
if (ioctl(socket_fd, SIOCGIFADDR, &request) < 0)
return(FALSE);
ifinfo->addr = ((struct sockaddr_in *) (&request.ifr_addr))->sin_addr;
/* get the PPP destination IP address */
strcpy(request.ifr_name, ifname);
if (ioctl(socket_fd, SIOCGIFDSTADDR, &request) >= 0)
ifinfo->dstaddr = ((struct sockaddr_in *)
(&request.ifr_dstaddr))->sin_addr;
/* get the netmask */
strcpy(request.ifr_name, ifname);
if (ioctl(socket_fd, SIOCGIFNETMASK, &request) >= 0) {
ifinfo->netmask = ((struct sockaddr_in *)
(&request.ifr_netmask))->sin_addr;
return (TRUE);
}
return(FALSE);
}
static int get_ifinfo(const char *ifname, ifinfo_t *ifinfo)
{
int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
FILE *stats_file = fopen("/proc/net/dev", "r");
int result;
if (socket_fd < 0 || !stats_file)
result = FALSE;
else
{
char *sp = strchr(ifname, '/');
if (sp)
*sp = '\0';
result = _get_ifinfo_(socket_fd, stats_file, ifname, ifinfo);
if (sp)
*sp = '/';
}
if (socket_fd >= 0)
close(socket_fd);
if (stats_file)
fclose(stats_file);
return(result);
}
#ifndef HAVE_INET_ATON
/*
* Note: This is not a true replacement for inet_aton(), as it won't
* do the right thing on "255.255.255.255" (which translates to -1 on
* most machines). Fortunately this code will be used only if you're
* on an older Linux that lacks a real implementation.
*/
#ifdef HAVE_NETINET_IN_SYSTM_H
# include <sys/types.h>
# include <netinet/in_systm.h>
#endif
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <string.h>
static int inet_aton(const char *cp, struct in_addr *inp) {
long addr;
addr = inet_addr(cp);
if (addr == ((long) -1)) return 0;
memcpy(inp, &addr, sizeof(addr));
return 1;
}
#endif /* HAVE_INET_ATON */
void interface_parse(char *buf, struct hostdata *hp)
/* parse 'interface' specification */
{
char *cp1, *cp2;
hp->interface = xstrdup(buf);
/* find and isolate just the IP address */
if (!(cp1 = strchr(buf, '/')))
(void) error(PS_SYNTAX, 0, _("missing IP interface address"));
*cp1++ = '\000';
/* find and isolate just the netmask */
if (!(cp2 = strchr(cp1, '/')))
cp2 = "255.255.255.255";
else
*cp2++ = '\000';
/* convert IP address and netmask */
hp->interface_pair = (struct interface_pair_s *)xmalloc(sizeof(struct interface_pair_s));
if (!inet_aton(cp1, &hp->interface_pair->interface_address))
(void) error(PS_SYNTAX, 0, _("invalid IP interface address"));
if (!inet_aton(cp2, &hp->interface_pair->interface_mask))
(void) error(PS_SYNTAX, 0, _("invalid IP interface mask"));
/* apply the mask now to the IP address (range) required */
hp->interface_pair->interface_address.s_addr &=
hp->interface_pair->interface_mask.s_addr;
/* restore original interface string (for configuration dumper) */
*--cp1 = '/';
return;
}
void interface_note_activity(struct hostdata *hp)
/* save interface I/O counts */
{
ifinfo_t ifinfo;
struct query *ctl;
/* if not monitoring link, all done */
if (!hp->monitor)
return;
/* get the current I/O stats for the monitored link */
if (get_ifinfo(hp->monitor, &ifinfo))
/* update this and preceeding host entries using the link
(they were already set during this pass but the I/O
count has now changed and they need to be re-updated)
*/
for (ctl = querylist; ctl; ctl = ctl->next) {
if (ctl->server.monitor && !strcmp(hp->monitor, ctl->server.monitor))
ctl->server.monitor_io =
ifinfo.rx_packets + ifinfo.tx_packets;
/* do NOT update host entries following this one */
if (&ctl->server == hp)
break;
}
#ifdef ACTIVITY_DEBUG
(void) error(0, 0, _("activity on %s -noted- as %d"),
hp->monitor, hp->monitor_io);
#endif
}
int interface_approve(struct hostdata *hp)
/* return TRUE if OK to poll, FALSE otherwise */
{
ifinfo_t ifinfo;
/* check interface IP address (range), if specified */
if (hp->interface) {
/* get interface info */
if (!get_ifinfo(hp->interface, &ifinfo)) {
(void) error(0, 0, _("skipping poll of %s, %s down"),
hp->pollname, hp->interface);
return(FALSE);
}
/* check the IP address (range) */
if ((ifinfo.addr.s_addr &
hp->interface_pair->interface_mask.s_addr) !=
hp->interface_pair->interface_address.s_addr) {
(void) error(0, 0,
_("skipping poll of %s, %s IP address excluded"),
hp->pollname, hp->interface);
return(FALSE);
}
}
/* if not monitoring link, all done */
if (!hp->monitor)
return(TRUE);
#ifdef ACTIVITY_DEBUG
(void) error(0, 0, _("activity on %s checked as %d"),
hp->monitor, hp->monitor_io);
#endif
/* if monitoring, check link for activity if it is up */
if (get_ifinfo(hp->monitor, &ifinfo) &&
hp->monitor_io == ifinfo.rx_packets +
ifinfo.tx_packets) {
(void) error(0, 0, _("skipping poll of %s, %s inactive"),
hp->pollname, hp->monitor);
return(FALSE);
}
return(TRUE);
}
#endif /* defined(linux) && !defined(INET6) */
|
