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-rw-r--r--src/network/if_freenameindex.c7
-rw-r--r--src/network/if_nameindex.c58
2 files changed, 65 insertions, 0 deletions
diff --git a/src/network/if_freenameindex.c b/src/network/if_freenameindex.c
new file mode 100644
index 00000000..89bafcc0
--- /dev/null
+++ b/src/network/if_freenameindex.c
@@ -0,0 +1,7 @@
+#include <net/if.h>
+#include <stdlib.h>
+
+void if_freenameindex(struct if_nameindex *idx)
+{
+ free(idx);
+}
diff --git a/src/network/if_nameindex.c b/src/network/if_nameindex.c
new file mode 100644
index 00000000..580acce0
--- /dev/null
+++ b/src/network/if_nameindex.c
@@ -0,0 +1,58 @@
+#define _GNU_SOURCE
+#include <net/if.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include "syscall.h"
+
+#include <stdio.h>
+
+static void *do_nameindex(int s, size_t n)
+{
+ size_t i, len;
+ struct ifconf conf;
+ struct if_nameindex *idx;
+
+ idx = malloc(n * (sizeof(struct if_nameindex)+sizeof(struct ifreq)));
+ if (!idx) return 0;
+
+ conf.ifc_buf = (void *)&idx[n];
+ conf.ifc_len = len = n * sizeof(struct ifreq);
+ if (ioctl(s, SIOCGIFCONF, &conf) < 0) {
+ free(idx);
+ return 0;
+ }
+ if (conf.ifc_len == len) {
+ free(idx);
+ return (void *)-1;
+ }
+
+ n = conf.ifc_len / sizeof(struct ifreq);
+ for (i=0; i<n; i++) {
+ if (ioctl(s, SIOCGIFINDEX, &conf.ifc_req[i]) < 0) {
+ i--;
+ n--;
+ continue;
+ }
+ idx[i].if_index = conf.ifc_req[i].ifr_ifindex;
+ idx[i].if_name = conf.ifc_req[i].ifr_name;
+ }
+ idx[i].if_name = 0;
+ idx[i].if_index = 0;
+
+ return idx;
+}
+
+struct if_nameindex *if_nameindex()
+{
+ size_t n;
+ void *p = 0;
+ int s = socket(AF_UNIX, SOCK_DGRAM, 0);
+ if (s>=0) {
+ for (n=0; (p=do_nameindex(s, n)) == (void *)-1; n++);
+ __syscall(SYS_close, s);
+ }
+ errno = ENOBUFS;
+ return p;
+}