1 // vim:ts=4:sw=4:expandtab
2 #include <sys/socket.h>
8 #include <sys/sockio.h>
11 #include <net80211/ieee80211.h>
12 #include <net80211/ieee80211_ioctl.h>
18 #define LOOPBACK_DEV "lo"
20 #define LOOPBACK_DEV "lo0"
23 static bool sysfs_devtype(char *dest, size_t n, const char *ifnam) {
27 snprintf(buf, sizeof(buf), "/sys/class/net/%s/uevent", ifnam);
28 if ((fp = fopen(buf, "r")) == NULL)
33 while (fgets(buf, sizeof(buf), fp)) {
38 /* Line is too long to fit in the buffer */
39 if (buf[slen - 1] != '\n' && !feof(fp))
41 if ((s = strchr(buf, '='))) {
42 if (strncmp(buf, "DEVTYPE", s - buf))
45 strncpy(dest, ++s, n);
53 static net_type_t iface_type(const char *ifname) {
57 if (!sysfs_devtype(devtype, sizeof(devtype), ifname))
58 return NET_TYPE_OTHER;
61 return NET_TYPE_ETHERNET;
63 if (strcmp(devtype, "wlan") == 0)
64 return NET_TYPE_WIRELESS;
66 if (strcmp(devtype, "wwan") == 0)
67 return NET_TYPE_OTHER;
69 return NET_TYPE_OTHER;
72 *First determine if the device is a wireless device by trying two ioctl(2)
73 * commands against it. If either succeeds we can be sure it's a wireless
75 * Otherwise we try another ioctl(2) to determine the interface media. If that
76 * fails it's not an ethernet device eiter.
79 struct ieee80211_bssid bssid;
80 struct ieee80211_nwid nwid;
81 struct ifmediareq ifmr;
85 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
86 return NET_TYPE_OTHER;
88 memset(&ifr, 0, sizeof(ifr));
89 ifr.ifr_data = (caddr_t)&nwid;
90 (void)strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
91 inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
93 memset(&bssid, 0, sizeof(bssid));
94 strlcpy(bssid.i_name, ifname, sizeof(bssid.i_name));
95 ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
97 if (ibssid == 0 || inwid == 0)
98 return NET_TYPE_WIRELESS;
100 (void)memset(&ifmr, 0, sizeof(ifmr));
101 (void)strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
103 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
104 return NET_TYPE_OTHER;
106 return NET_TYPE_ETHERNET;
110 #error Missing implementation to determine interface type.
114 const char *first_eth_interface(const net_type_t type) {
115 static char *interface = NULL;
116 struct ifaddrs *ifaddr, *addrp;
128 addrp = addrp->ifa_next) {
129 if (strncasecmp(LOOPBACK_DEV, addrp->ifa_name, strlen(LOOPBACK_DEV)) == 0)
131 if (addrp->ifa_addr == NULL)
134 if (addrp->ifa_addr->sa_family != AF_LINK)
137 // Skip PF_PACKET addresses (MAC addresses), as they are present on any
138 // ethernet interface.
139 if (addrp->ifa_addr->sa_family != AF_INET &&
140 addrp->ifa_addr->sa_family != AF_INET6)
142 #endif /* !__OpenBSD__ */
143 // Skip this interface if it is a wireless interface.
144 iftype = iface_type(addrp->ifa_name);
147 interface = strdup(addrp->ifa_name);