2 * interface.c -- implements fetchmail 'interface' and 'monitor' commands
4 * This module was implemented by George M. Sipe <gsipe@mindspring.com>
5 * or <gsipe@acm.org> and is:
7 * Copyright (c) 1996,1997 by George M. Sipe - ALL RIGHTS RESERVED
9 * This is free software; you can redistribute it and/or modify it under
10 * the terms of the GNU General Public License as published by the Free
11 * Software Foundation; version 2, or (at your option) any later version.
14 #if defined(linux) && !defined(INET6)
19 #if defined(STDC_HEADERS)
22 #if defined(HAVE_UNISTD_H)
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <netinet/in.h>
28 #include <arpa/inet.h>
31 #include "fetchmail.h"
35 struct in_addr addr, dstaddr, netmask;
36 int rx_packets, tx_packets;
39 struct interface_pair_s {
40 struct in_addr interface_address;
41 struct in_addr interface_mask;
44 static int _get_ifinfo_(int socket_fd, FILE *stats_file, const char *ifname,
46 /* get active network interface information - return non-zero upon success */
48 int namelen = strlen(ifname);
50 char *cp, buffer[256];
54 /* initialize result */
55 memset((char *) ifinfo, 0, sizeof(ifinfo_t));
57 /* get the packet I/O counts */
58 while (fgets(buffer, sizeof(buffer) - 1, stats_file)) {
59 for (cp = buffer; *cp && *cp == ' '; ++cp);
60 if (!strncmp(cp, ifname, namelen) &&
63 if (sscanf(cp, "%d %d %*d %*d %*d %d %*d %d %*d %*d"
64 " %*d %*d %d",counts, counts+1, counts+2,
65 counts+3,&found)>4) { /* found = dummy */
66 /* newer kernel with byte counts */
67 ifinfo->rx_packets=counts[1];
68 ifinfo->tx_packets=counts[3];
70 /* older kernel, no byte counts */
71 ifinfo->rx_packets=counts[0];
72 ifinfo->tx_packets=counts[2];
77 if (!found) return (FALSE);
79 /* see if the interface is up */
80 strcpy(request.ifr_name, ifname);
81 if (ioctl(socket_fd, SIOCGIFFLAGS, &request) < 0)
83 if (!(request.ifr_flags & IFF_RUNNING))
86 /* get the IP address */
87 strcpy(request.ifr_name, ifname);
88 if (ioctl(socket_fd, SIOCGIFADDR, &request) < 0)
90 ifinfo->addr = ((struct sockaddr_in *) (&request.ifr_addr))->sin_addr;
92 /* get the PPP destination IP address */
93 strcpy(request.ifr_name, ifname);
94 if (ioctl(socket_fd, SIOCGIFDSTADDR, &request) >= 0)
95 ifinfo->dstaddr = ((struct sockaddr_in *)
96 (&request.ifr_dstaddr))->sin_addr;
99 strcpy(request.ifr_name, ifname);
100 if (ioctl(socket_fd, SIOCGIFNETMASK, &request) >= 0) {
101 ifinfo->netmask = ((struct sockaddr_in *)
102 (&request.ifr_netmask))->sin_addr;
109 static int get_ifinfo(const char *ifname, ifinfo_t *ifinfo)
111 int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
112 FILE *stats_file = fopen("/proc/net/dev", "r");
115 if (socket_fd < 0 || !stats_file)
119 char *sp = strchr(ifname, '/');
123 result = _get_ifinfo_(socket_fd, stats_file, ifname, ifinfo);
134 #ifndef HAVE_INET_ATON
136 * Note: This is not a true replacement for inet_aton(), as it won't
137 * do the right thing on "255.255.255.255" (which translates to -1 on
138 * most machines). Fortunately this code will be used only if you're
139 * on an older Linux that lacks a real implementation.
141 #ifdef HAVE_NETINET_IN_SYSTM_H
142 # include <sys/types.h>
143 # include <netinet/in_systm.h>
146 #include <netinet/in.h>
147 #include <netinet/ip.h>
148 #include <arpa/inet.h>
151 static int inet_aton(const char *cp, struct in_addr *inp) {
154 addr = inet_addr(cp);
155 if (addr == ((long) -1)) return 0;
157 memcpy(inp, &addr, sizeof(addr));
160 #endif /* HAVE_INET_ATON */
162 void interface_parse(char *buf, struct hostdata *hp)
163 /* parse 'interface' specification */
167 hp->interface = xstrdup(buf);
169 /* find and isolate just the IP address */
170 if (!(cp1 = strchr(buf, '/')))
171 (void) report(stderr, PS_SYNTAX, 0, _("missing IP interface address"));
174 /* find and isolate just the netmask */
175 if (!(cp2 = strchr(cp1, '/')))
176 cp2 = "255.255.255.255";
180 /* convert IP address and netmask */
181 hp->interface_pair = (struct interface_pair_s *)xmalloc(sizeof(struct interface_pair_s));
182 if (!inet_aton(cp1, &hp->interface_pair->interface_address))
183 (void) report(stderr, PS_SYNTAX, 0, _("invalid IP interface address"));
184 if (!inet_aton(cp2, &hp->interface_pair->interface_mask))
185 (void) report(stderr, PS_SYNTAX, 0, _("invalid IP interface mask"));
186 /* apply the mask now to the IP address (range) required */
187 hp->interface_pair->interface_address.s_addr &=
188 hp->interface_pair->interface_mask.s_addr;
190 /* restore original interface string (for configuration dumper) */
195 void interface_note_activity(struct hostdata *hp)
196 /* save interface I/O counts */
201 /* if not monitoring link, all done */
205 /* get the current I/O stats for the monitored link */
206 if (get_ifinfo(hp->monitor, &ifinfo))
207 /* update this and preceeding host entries using the link
208 (they were already set during this pass but the I/O
209 count has now changed and they need to be re-updated)
211 for (ctl = querylist; ctl; ctl = ctl->next) {
212 if (ctl->server.monitor && !strcmp(hp->monitor, ctl->server.monitor))
213 ctl->server.monitor_io =
214 ifinfo.rx_packets + ifinfo.tx_packets;
215 /* do NOT update host entries following this one */
216 if (&ctl->server == hp)
220 #ifdef ACTIVITY_DEBUG
221 (void) report(stdout, 0, _("activity on %s -noted- as %d"),
222 hp->monitor, hp->monitor_io);
226 int interface_approve(struct hostdata *hp)
227 /* return TRUE if OK to poll, FALSE otherwise */
231 /* check interface IP address (range), if specified */
233 /* get interface info */
234 if (!get_ifinfo(hp->interface, &ifinfo)) {
235 (void) report(stdout, 0, _("skipping poll of %s, %s down"),
236 hp->pollname, hp->interface);
239 /* check the IP address (range) */
240 if ((ifinfo.addr.s_addr &
241 hp->interface_pair->interface_mask.s_addr) !=
242 hp->interface_pair->interface_address.s_addr) {
243 (void) report(stdout, 0,
244 _("skipping poll of %s, %s IP address excluded"),
245 hp->pollname, hp->interface);
250 /* if not monitoring link, all done */
254 #ifdef ACTIVITY_DEBUG
255 (void) report(stdout, 0, _("activity on %s checked as %d"),
256 hp->monitor, hp->monitor_io);
258 /* if monitoring, check link for activity if it is up */
259 if (get_ifinfo(hp->monitor, &ifinfo) &&
260 hp->monitor_io == ifinfo.rx_packets +
262 (void) report(stdout, 0, _("skipping poll of %s, %s inactive"),
263 hp->pollname, hp->monitor);
269 #endif /* defined(linux) && !defined(INET6) */