1 // vim:ts=4:sw=4:expandtab
3 #include <sys/socket.h>
7 #if defined(__OpenBSD__) || defined(__DragonFly__)
9 #include <sys/sockio.h>
10 #include <sys/ioctl.h>
13 #if defined(__OpenBSD__)
14 #include <net80211/ieee80211.h>
15 #include <net80211/ieee80211_ioctl.h>
16 #elif defined(__DragonFly__)
17 #include <netproto/802_11/ieee80211_ioctl.h>
23 #define LOOPBACK_DEV "lo0"
25 #define LOOPBACK_DEV "lo"
28 static bool sysfs_devtype(char *dest, size_t n, const char *ifnam) {
32 snprintf(buf, sizeof(buf), "/sys/class/net/%s/uevent", ifnam);
33 if ((fp = fopen(buf, "r")) == NULL)
38 while (fgets(buf, sizeof(buf), fp)) {
43 /* Line is too long to fit in the buffer */
44 if (buf[slen - 1] != '\n' && !feof(fp))
46 if ((s = strchr(buf, '='))) {
47 if (strncmp(buf, "DEVTYPE", s - buf))
50 strncpy(dest, ++s, n);
58 static bool is_virtual(const char *ifname) {
61 bool is_virtual = false;
63 snprintf(path, sizeof(path), "/sys/class/net/%s", ifname);
64 if ((target = realpath(path, NULL))) {
65 if (BEGINS_WITH(target, "/sys/devices/virtual/")) {
74 static net_type_t iface_type(const char *ifname) {
75 #if defined(__OpenBSD__)
77 *First determine if the device is a wireless device by trying two ioctl(2)
78 * commands against it. If either succeeds we can be sure it's a wireless
80 * Otherwise we try another ioctl(2) to determine the interface media. If that
81 * fails it's not an ethernet device eiter.
84 struct ieee80211_bssid bssid;
85 struct ieee80211_nwid nwid;
86 #elif defined(__DragonFly__)
87 struct ieee80211req ifr;
89 #if defined(__OpenBSD__) || defined(__DragonFly__)
90 struct ifmediareq ifmr;
93 #if defined(__OpenBSD__)
96 #if defined(__OpenBSD__) || defined(__DragonFly__)
97 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
98 return NET_TYPE_OTHER;
100 memset(&ifr, 0, sizeof(ifr));
102 #if defined(__OpenBSD__)
103 ifr.ifr_data = (caddr_t)&nwid;
104 (void)strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
105 inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
107 memset(&bssid, 0, sizeof(bssid));
108 strlcpy(bssid.i_name, ifname, sizeof(bssid.i_name));
109 ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
111 if (ibssid == 0 || inwid == 0) {
113 return NET_TYPE_WIRELESS;
115 #elif defined(__DragonFly__)
116 (void)strlcpy(ifr.i_name, ifname, sizeof(ifr.i_name));
117 ifr.i_type = IEEE80211_IOC_NUMSSIDS;
118 if (ioctl(s, SIOCG80211, &ifr) == 0) {
120 return NET_TYPE_WIRELESS;
123 #if defined(__OpenBSD__) || defined(__DragonFly__)
124 (void)memset(&ifmr, 0, sizeof(ifmr));
125 (void)strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
127 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
129 return NET_TYPE_OTHER;
132 return NET_TYPE_ETHERNET;
137 if (!sysfs_devtype(devtype, sizeof(devtype), ifname))
138 return NET_TYPE_OTHER;
140 /* Default to Ethernet when no devtype is available */
142 return NET_TYPE_ETHERNET;
144 if (strcmp(devtype, "wlan") == 0)
145 return NET_TYPE_WIRELESS;
147 if (strcmp(devtype, "wwan") == 0)
148 return NET_TYPE_OTHER;
150 return NET_TYPE_OTHER;
152 return NET_TYPE_OTHER;
155 const char *first_eth_interface(const net_type_t type) {
156 static char *interface = NULL;
157 struct ifaddrs *ifaddr, *addrp;
169 addrp = addrp->ifa_next) {
170 if (strncasecmp(LOOPBACK_DEV, addrp->ifa_name, strlen(LOOPBACK_DEV)) == 0)
172 if (addrp->ifa_addr == NULL)
175 if (addrp->ifa_addr->sa_family != AF_LINK)
178 // Skip PF_PACKET addresses (MAC addresses), as they are present on any
179 // ethernet interface.
180 if (addrp->ifa_addr->sa_family != AF_INET &&
181 addrp->ifa_addr->sa_family != AF_INET6)
183 #endif /* !__OpenBSD__ */
184 // Skip this interface if it is a wireless interface.
185 iftype = iface_type(addrp->ifa_name);
188 if (is_virtual(addrp->ifa_name))
190 interface = strdup(addrp->ifa_name);