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// vim:ts=4:sw=4:expandtab
#include <sys/socket.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <ifaddrs.h>
#ifdef __OpenBSD__
#include <sys/types.h>
#include <sys/sockio.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net80211/ieee80211.h>
#include <net80211/ieee80211_ioctl.h>
#endif
#include "i3status.h"
#ifdef __OpenBSD__
#define LOOPBACK_DEV "lo0"
#else
#define LOOPBACK_DEV "lo"
#endif
static bool sysfs_devtype(char *dest, size_t n, const char *ifnam) {
FILE *fp;
char buf[1024];
snprintf(buf, sizeof(buf), "/sys/class/net/%s/uevent", ifnam);
if ((fp = fopen(buf, "r")) == NULL)
return false;
dest[0] = '\0';
while (fgets(buf, sizeof(buf), fp)) {
size_t slen;
char *s;
slen = strlen(buf);
/* Line is too long to fit in the buffer */
if (buf[slen - 1] != '\n' && !feof(fp))
break;
if ((s = strchr(buf, '='))) {
if (strncmp(buf, "DEVTYPE", s - buf))
continue;
buf[slen - 1] = '\0';
strncpy(dest, ++s, n);
break;
}
}
fclose(fp);
return true;
}
static bool is_virtual(const char *ifname) {
char path[1024];
char *target = NULL;
bool is_virtual = false;
snprintf(path, sizeof(path), "/sys/class/net/%s", ifname);
if ((target = realpath(path, NULL))) {
if (BEGINS_WITH(target, "/sys/devices/virtual/")) {
is_virtual = true;
}
}
free(target);
return is_virtual;
}
static net_type_t iface_type(const char *ifname) {
#ifdef __OpenBSD__
/*
*First determine if the device is a wireless device by trying two ioctl(2)
* commands against it. If either succeeds we can be sure it's a wireless
* device.
* Otherwise we try another ioctl(2) to determine the interface media. If that
* fails it's not an ethernet device eiter.
*/
struct ifreq ifr;
struct ieee80211_bssid bssid;
struct ieee80211_nwid nwid;
struct ifmediareq ifmr;
int s, ibssid, inwid;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return NET_TYPE_OTHER;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_data = (caddr_t)&nwid;
(void)strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
memset(&bssid, 0, sizeof(bssid));
strlcpy(bssid.i_name, ifname, sizeof(bssid.i_name));
ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
if (ibssid == 0 || inwid == 0) {
close(s);
return NET_TYPE_WIRELESS;
}
(void)memset(&ifmr, 0, sizeof(ifmr));
(void)strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
close(s);
return NET_TYPE_OTHER;
} else {
close(s);
return NET_TYPE_ETHERNET;
}
#else
char devtype[32];
if (!sysfs_devtype(devtype, sizeof(devtype), ifname))
return NET_TYPE_OTHER;
/* Default to Ethernet when no devtype is available */
if (!devtype[0])
return NET_TYPE_ETHERNET;
if (strcmp(devtype, "wlan") == 0)
return NET_TYPE_WIRELESS;
if (strcmp(devtype, "wwan") == 0)
return NET_TYPE_OTHER;
return NET_TYPE_OTHER;
#endif
}
const char *first_eth_interface(const net_type_t type) {
static char *interface = NULL;
struct ifaddrs *ifaddr, *addrp;
net_type_t iftype;
getifaddrs(&ifaddr);
if (ifaddr == NULL)
return NULL;
free(interface);
interface = NULL;
for (addrp = ifaddr;
addrp != NULL;
addrp = addrp->ifa_next) {
if (strncasecmp(LOOPBACK_DEV, addrp->ifa_name, strlen(LOOPBACK_DEV)) == 0)
continue;
if (addrp->ifa_addr == NULL)
continue;
#ifdef __OpenBSD__
if (addrp->ifa_addr->sa_family != AF_LINK)
continue;
#else
// Skip PF_PACKET addresses (MAC addresses), as they are present on any
// ethernet interface.
if (addrp->ifa_addr->sa_family != AF_INET &&
addrp->ifa_addr->sa_family != AF_INET6)
continue;
#endif /* !__OpenBSD__ */
// Skip this interface if it is a wireless interface.
iftype = iface_type(addrp->ifa_name);
if (iftype != type)
continue;
if (is_virtual(addrp->ifa_name))
continue;
interface = strdup(addrp->ifa_name);
break;
}
freeifaddrs(ifaddr);
return interface;
}
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