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 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.
19 #include <sys/ioctl.h>
20 #include <netinet/in.h>
21 #include <linux/netdevice.h>
22 #include "fetchmail.h"
25 struct in_addr addr, dstaddr, netmask;
26 int rx_packets, tx_packets;
30 struct in_addr interface_address;
31 struct in_addr interface_mask;
34 /* Get active network interface information. Return non-zero upon success. */
36 static int _get_ifinfo_(int socket_fd, FILE *stats_file, const char *ifname,
39 int namelen = strlen(ifname);
41 char *cp, buffer[256];
43 /* initialize result */
44 memset((char *) ifinfo, 0, sizeof(ifinfo_t));
46 /* see if the interface is up */
47 strcpy(request.ifr_name, ifname);
48 if (ioctl(socket_fd, SIOCGIFFLAGS, &request) < 0)
50 if (!(request.ifr_flags & IFF_RUNNING))
53 /* get the IP address */
54 strcpy(request.ifr_name, ifname);
55 if (ioctl(socket_fd, SIOCGIFADDR, &request) < 0)
57 ifinfo->addr = ((struct sockaddr_in *) (&request.ifr_addr))->sin_addr;
59 /* get the PPP destination IP address */
60 strcpy(request.ifr_name, ifname);
61 if (ioctl(socket_fd, SIOCGIFDSTADDR, &request) >= 0)
62 ifinfo->dstaddr = ((struct sockaddr_in *)
63 (&request.ifr_dstaddr))->sin_addr;
66 strcpy(request.ifr_name, ifname);
67 if (ioctl(socket_fd, SIOCGIFNETMASK, &request) >= 0)
68 ifinfo->netmask = ((struct sockaddr_in *)
69 (&request.ifr_netmask))->sin_addr;
71 /* get the packet I/O counts */
72 while (fgets(buffer, sizeof(buffer) - 1, stats_file)) {
73 for (cp = buffer; *cp && *cp == ' '; ++cp);
74 if (!strncmp(cp, ifname, namelen) &&
77 sscanf(cp, "%d %*d %*d %*d %*d %d %*d %*d %*d %*d %*d",
78 &ifinfo->rx_packets, &ifinfo->tx_packets);
85 static int get_ifinfo(const char *ifname, ifinfo_t *ifinfo)
87 int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
88 FILE *stats_file = fopen("/proc/net/dev", "r");
91 if (socket_fd < 0 || !stats_file)
94 result = _get_ifinfo_(socket_fd, stats_file, ifname, ifinfo);
102 void interface_parse(struct hostdata *hp)
103 /* parse 'interface' specification. */
107 struct ifreq request;
112 /* find and isolate just the IP address */
113 if (!(cp1 = strchr(hp->interface, '/')))
114 (void) error(PS_SYNTAX, 0, "missing IP interface address");
117 /* validate specified interface exists */
118 strcpy(request.ifr_name, hp->interface);
119 socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
120 if (ioctl(socket_fd, SIOCGIFFLAGS, &request) < 0)
121 (void) error(PS_SYNTAX, 0, "no such interface device '%s'",
125 /* find and isolate just the netmask */
126 if (!(cp2 = strchr(cp1, '/')))
127 cp2 = "255.255.255.255";
131 /* convert IP address and netmask */
132 hp->inter = xmalloc(sizeof(struct ipair));
133 if (!inet_aton(cp1, &hp->inter->interface_address))
134 (void) error(PS_SYNTAX, 0, "invalid IP interface address");
135 if (!inet_aton(cp2, &hp->inter->interface_mask))
136 (void) error(PS_SYNTAX, 0, "invalid IP interface mask");
137 /* apply the mask now to the IP address (range) required */
138 hp->inter->interface_address.s_addr &= hp->inter->interface_mask.s_addr;
142 int interface_check(struct hostdata *hp)
143 /* return TRUE if OK to poll, FALSE otherwise */
147 /* check interface IP address (range), if specified */
149 /* get interface info */
150 if (!get_ifinfo(hp->interface, &ifinfo)) {
151 (void) error(0, 0, "skipping poll of %s, %s down",
152 hp->names->id, hp->interface);
155 /* check the IP address (range) */
156 if ((ifinfo.addr.s_addr & hp->inter->interface_mask.s_addr) !=
157 hp->inter->interface_address.s_addr) {
159 "skipping poll of %s, %s IP address excluded",
160 hp->names->id, hp->interface);
165 /* if monitoring, check link for activity if it is up */
166 if (hp->monitor && get_ifinfo(hp->monitor, &ifinfo) &&
167 hp->monitor_io == ifinfo.rx_packets + ifinfo.tx_packets) {
169 "skipping poll of %s, %s inactive",
170 hp->names->id, hp->monitor);
174 /* get the current I/O stats for the monitored link */
175 if (hp->monitor && get_ifinfo(hp->monitor, &ifinfo))
176 hp->monitor_io = ifinfo.rx_packets + ifinfo.tx_packets;