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@@ -4,7 +4,12 @@
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#include <json-c/json.h>
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#include <iwinfo.h>
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#include <net/if.h>
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+#include <glob.h>
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+#include <alloca.h>
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+#define NETIF_PREFIX "/sys/class/net/"
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+#define VIRTIF_PREFIX "/sys/devices/virtual/net/"
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+#define LOWERGLOB_SUFFIX "/lower_*"
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static struct json_object *get_stations(const struct iwinfo_ops *iw, const char *ifname) {
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int len;
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@@ -40,12 +45,68 @@ static void badrequest() {
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exit(1);
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}
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+// recurse down to the lowest layer-2 interface
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+static int interface_get_lowest(const char *ifname, char *hwifname);
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+static int interface_get_lowest(const char *ifname, char *hwifname) {
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+ glob_t globbuf;
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+ char *fnamebuf = alloca(1 + strlen(VIRTIF_PREFIX) + IF_NAMESIZE +
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+ strlen(LOWERGLOB_SUFFIX));
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+ char *lowentry = NULL;
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+
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+
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+ sprintf(fnamebuf, "%s%s%s", VIRTIF_PREFIX, ifname, LOWERGLOB_SUFFIX);
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+ glob(fnamebuf, GLOB_NOSORT | GLOB_NOESCAPE, NULL, &globbuf);
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+
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+ if (globbuf.gl_pathc == 1) {
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+ lowentry = alloca(1 + strlen(globbuf.gl_pathv[0]));
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+ strncpy(lowentry, globbuf.gl_pathv[0], 1 + strlen(globbuf.gl_pathv[0]));
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+ }
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+
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+ globfree(&globbuf);
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+
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+ if (!lowentry) {
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+ char *path = alloca(1 + strlen(NETIF_PREFIX) + strlen(ifname));
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+ sprintf(path, "%s%s", NETIF_PREFIX, ifname);
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+
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+ if(access(path, F_OK) != 0)
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+ return false;
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+
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+ strncpy(hwifname, ifname, IF_NAMESIZE - 1);
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+ return true;
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+ } else {
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+ char buf[PATH_MAX];
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+ ssize_t len;
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+
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+ if ((len = readlink(lowentry, buf, sizeof(buf)-1)) != -1)
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+ buf[len] = '\0';
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+ else
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+ return false;
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+
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+ if (strncmp(buf, "../", 3) == 0) {
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+ return interface_get_lowest(strrchr(buf, '/') + 1, hwifname);
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+ } else {
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+ return false;
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+ }
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+ }
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+}
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+
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int main(int argc, char *argv[]) {
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if (argc != 2)
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badrequest();
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const char *ifname = argv[1];
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- const struct iwinfo_ops *iw = iwinfo_backend(ifname);
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+ char hwifname[IF_NAMESIZE] = "";
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+
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+ if (strlen(ifname) >= IF_NAMESIZE)
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+ badrequest();
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+
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+ if (strcspn(ifname, "/\\[]{}*?") != strlen(ifname))
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+ badrequest();
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+
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+ if (!interface_get_lowest(ifname, hwifname))
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+ badrequest();
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+
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+ const struct iwinfo_ops *iw = iwinfo_backend(hwifname);
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if (iw == NULL)
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badrequest();
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@@ -54,7 +115,7 @@ int main(int argc, char *argv[]) {
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while (true) {
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struct json_object *obj;
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- obj = get_stations(iw, ifname);
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+ obj = get_stations(iw, hwifname);
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printf("data: %s\n\n", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_PLAIN));
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fflush(stdout);
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json_object_put(obj);
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