1 // vim:ts=4:sw=4:expandtab
2 #include <sys/socket.h>
6 #if defined(__OpenBSD__) || defined(__DragonFly__)
8 #include <sys/sockio.h>
12 #if defined(__OpenBSD__)
13 #include <net80211/ieee80211.h>
14 #include <net80211/ieee80211_ioctl.h>
15 #elif defined(__DragonFly__)
16 #include <netproto/802_11/ieee80211_ioctl.h>
22 #define LOOPBACK_DEV "lo0"
24 #define LOOPBACK_DEV "lo"
27 static bool sysfs_devtype(char *dest, size_t n, const char *ifnam) {
31 snprintf(buf, sizeof(buf), "/sys/class/net/%s/uevent", ifnam);
32 if ((fp = fopen(buf, "r")) == NULL)
37 while (fgets(buf, sizeof(buf), fp)) {
42 /* Line is too long to fit in the buffer */
43 if (buf[slen - 1] != '\n' && !feof(fp))
45 if ((s = strchr(buf, '='))) {
46 if (strncmp(buf, "DEVTYPE", s - buf))
49 strncpy(dest, ++s, n);
57 static bool is_virtual(const char *ifname) {
60 bool is_virtual = false;
62 snprintf(path, sizeof(path), "/sys/class/net/%s", ifname);
63 if ((target = realpath(path, NULL))) {
64 if (BEGINS_WITH(target, "/sys/devices/virtual/")) {
73 static net_type_t iface_type(const char *ifname) {
74 #if defined(__OpenBSD__)
76 *First determine if the device is a wireless device by trying two ioctl(2)
77 * commands against it. If either succeeds we can be sure it's a wireless
79 * Otherwise we try another ioctl(2) to determine the interface media. If that
80 * fails it's not an ethernet device eiter.
83 struct ieee80211_bssid bssid;
84 struct ieee80211_nwid nwid;
85 #elif defined(__DragonFly__)
86 struct ieee80211req ifr;
88 #if defined(__OpenBSD__) || defined(__DragonFly__)
89 struct ifmediareq ifmr;
92 #if defined(__OpenBSD__)
95 #if defined(__OpenBSD__) || defined(__DragonFly__)
96 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
97 return NET_TYPE_OTHER;
99 memset(&ifr, 0, sizeof(ifr));
101 #if defined(__OpenBSD__)
102 ifr.ifr_data = (caddr_t)&nwid;
103 (void)strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
104 inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
106 memset(&bssid, 0, sizeof(bssid));
107 strlcpy(bssid.i_name, ifname, sizeof(bssid.i_name));
108 ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
110 if (ibssid == 0 || inwid == 0) {
112 return NET_TYPE_WIRELESS;
114 #elif defined(__DragonFly__)
115 (void)strlcpy(ifr.i_name, ifname, sizeof(ifr.i_name));
116 ifr.i_type = IEEE80211_IOC_NUMSSIDS;
117 if (ioctl(s, SIOCG80211, &ifr) == 0) {
119 return NET_TYPE_WIRELESS;
122 #if defined(__OpenBSD__) || defined(__DragonFly__)
123 (void)memset(&ifmr, 0, sizeof(ifmr));
124 (void)strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
126 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
128 return NET_TYPE_OTHER;
131 return NET_TYPE_ETHERNET;
136 if (!sysfs_devtype(devtype, sizeof(devtype), ifname))
137 return NET_TYPE_OTHER;
139 /* Default to Ethernet when no devtype is available */
141 return NET_TYPE_ETHERNET;
143 if (strcmp(devtype, "wlan") == 0)
144 return NET_TYPE_WIRELESS;
146 if (strcmp(devtype, "wwan") == 0)
147 return NET_TYPE_OTHER;
149 return NET_TYPE_OTHER;
151 return NET_TYPE_OTHER;
154 const char *first_eth_interface(const net_type_t type) {
155 static char *interface = NULL;
156 struct ifaddrs *ifaddr, *addrp;
168 addrp = addrp->ifa_next) {
169 if (strncasecmp(LOOPBACK_DEV, addrp->ifa_name, strlen(LOOPBACK_DEV)) == 0)
171 if (addrp->ifa_addr == NULL)
174 if (addrp->ifa_addr->sa_family != AF_LINK)
177 // Skip PF_PACKET addresses (MAC addresses), as they are present on any
178 // ethernet interface.
179 if (addrp->ifa_addr->sa_family != AF_INET &&
180 addrp->ifa_addr->sa_family != AF_INET6)
182 #endif /* !__OpenBSD__ */
183 // Skip this interface if it is a wireless interface.
184 iftype = iface_type(addrp->ifa_name);
187 if (is_virtual(addrp->ifa_name))
189 interface = strdup(addrp->ifa_name);