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"
34 struct in_addr addr, dstaddr, netmask;
35 int rx_packets, tx_packets;
38 struct interface_pair_s {
39 struct in_addr interface_address;
40 struct in_addr interface_mask;
43 static int _get_ifinfo_(int socket_fd, FILE *stats_file, const char *ifname,
45 /* get active network interface information - return non-zero upon success */
47 int namelen = strlen(ifname);
49 char *cp, buffer[256];
53 /* initialize result */
54 memset((char *) ifinfo, 0, sizeof(ifinfo_t));
56 /* get the packet I/O counts */
57 while (fgets(buffer, sizeof(buffer) - 1, stats_file)) {
58 for (cp = buffer; *cp && *cp == ' '; ++cp);
59 if (!strncmp(cp, ifname, namelen) &&
62 if (sscanf(cp, "%d %d %*d %*d %*d %d %*d %d %*d %*d"
63 " %*d %*d %d",counts, counts+1, counts+2,
64 counts+3,&found)>4) { /* found = dummy */
65 /* newer kernel with byte counts */
66 ifinfo->rx_packets=counts[1];
67 ifinfo->tx_packets=counts[3];
69 /* older kernel, no byte counts */
70 ifinfo->rx_packets=counts[0];
71 ifinfo->tx_packets=counts[2];
76 if (!found) return (FALSE);
78 /* see if the interface is up */
79 strcpy(request.ifr_name, ifname);
80 if (ioctl(socket_fd, SIOCGIFFLAGS, &request) < 0)
82 if (!(request.ifr_flags & IFF_RUNNING))
85 /* get the IP address */
86 strcpy(request.ifr_name, ifname);
87 if (ioctl(socket_fd, SIOCGIFADDR, &request) < 0)
89 ifinfo->addr = ((struct sockaddr_in *) (&request.ifr_addr))->sin_addr;
91 /* get the PPP destination IP address */
92 strcpy(request.ifr_name, ifname);
93 if (ioctl(socket_fd, SIOCGIFDSTADDR, &request) >= 0)
94 ifinfo->dstaddr = ((struct sockaddr_in *)
95 (&request.ifr_dstaddr))->sin_addr;
98 strcpy(request.ifr_name, ifname);
99 if (ioctl(socket_fd, SIOCGIFNETMASK, &request) >= 0) {
100 ifinfo->netmask = ((struct sockaddr_in *)
101 (&request.ifr_netmask))->sin_addr;
108 static int get_ifinfo(const char *ifname, ifinfo_t *ifinfo)
110 int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
111 FILE *stats_file = fopen("/proc/net/dev", "r");
114 if (socket_fd < 0 || !stats_file)
118 char *sp = strchr(ifname, '/');
122 result = _get_ifinfo_(socket_fd, stats_file, ifname, ifinfo);
133 #ifndef HAVE_INET_ATON
135 * Note: This is not a true replacement for inet_aton(), as it won't
136 * do the right thing on "255.255.255.255" (which translates to -1 on
137 * most machines). Fortunately this code will be used only if you're
138 * on an older Linux that lacks a real implementation.
140 #ifdef HAVE_NETINET_IN_SYSTM_H
141 # include <sys/types.h>
142 # include <netinet/in_systm.h>
145 #include <netinet/in.h>
146 #include <netinet/ip.h>
147 #include <arpa/inet.h>
150 static int inet_aton(const char *cp, struct in_addr *inp) {
153 addr = inet_addr(cp);
154 if (addr == ((long) -1)) return 0;
156 memcpy(inp, &addr, sizeof(addr));
159 #endif HAVE_INET_ATON
161 void interface_parse(char *buf, struct hostdata *hp)
162 /* parse 'interface' specification */
166 hp->interface = xstrdup(buf);
168 /* find and isolate just the IP address */
169 if (!(cp1 = strchr(buf, '/')))
170 (void) error(PS_SYNTAX, 0, "missing IP interface address");
173 /* find and isolate just the netmask */
174 if (!(cp2 = strchr(cp1, '/')))
175 cp2 = "255.255.255.255";
179 /* convert IP address and netmask */
180 hp->interface_pair = (struct interface_pair_s *)xmalloc(sizeof(struct interface_pair_s));
181 if (!inet_aton(cp1, &hp->interface_pair->interface_address))
182 (void) error(PS_SYNTAX, 0, "invalid IP interface address");
183 if (!inet_aton(cp2, &hp->interface_pair->interface_mask))
184 (void) error(PS_SYNTAX, 0, "invalid IP interface mask");
185 /* apply the mask now to the IP address (range) required */
186 hp->interface_pair->interface_address.s_addr &=
187 hp->interface_pair->interface_mask.s_addr;
189 /* restore original interface string (for configuration dumper) */
194 void interface_note_activity(struct hostdata *hp)
195 /* save interface I/O counts */
200 /* if not monitoring link, all done */
204 /* get the current I/O stats for the monitored link */
205 if (get_ifinfo(hp->monitor, &ifinfo))
206 /* update this and preceeding host entries using the link
207 (they were already set during this pass but the I/O
208 count has now changed and they need to be re-updated)
210 for (ctl = querylist; ctl; ctl = ctl->next) {
211 if (!strcmp(hp->monitor, ctl->server.monitor))
212 ctl->server.monitor_io =
213 ifinfo.rx_packets + ifinfo.tx_packets;
214 /* do NOT update host entries following this one */
215 if (&ctl->server == hp)
219 #ifdef ACTIVITY_DEBUG
220 (void) error(0, 0, "activity on %s -noted- as %d",
221 hp->monitor, hp->monitor_io);
225 int interface_approve(struct hostdata *hp)
226 /* return TRUE if OK to poll, FALSE otherwise */
230 /* check interface IP address (range), if specified */
232 /* get interface info */
233 if (!get_ifinfo(hp->interface, &ifinfo)) {
234 (void) error(0, 0, "skipping poll of %s, %s down",
235 hp->pollname, hp->interface);
238 /* check the IP address (range) */
239 if ((ifinfo.addr.s_addr &
240 hp->interface_pair->interface_mask.s_addr) !=
241 hp->interface_pair->interface_address.s_addr) {
243 "skipping poll of %s, %s IP address excluded",
244 hp->pollname, hp->interface);
249 /* if not monitoring link, all done */
253 #ifdef ACTIVITY_DEBUG
254 (void) error(0, 0, "activity on %s checked as %d",
255 hp->monitor, hp->monitor_io);
257 /* if monitoring, check link for activity if it is up */
258 if (get_ifinfo(hp->monitor, &ifinfo) &&
259 hp->monitor_io == ifinfo.rx_packets +
261 (void) error(0, 0, "skipping poll of %s, %s inactive",
262 hp->pollname, hp->monitor);
268 #endif /* defined(linux) && !defined(INET6) */