1 files changed, 67 insertions, 0 deletions
diff --git a/src/print_ip_addr.c b/src/print_ip_addr.c
new file mode 100644
index 0000000..6ddd35a
--- /dev/null
+++ b/src/print_ip_addr.c
@@ -0,0 +1,67 @@
+// vim:ts=8:expandtab
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <netdb.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+
+#include "i3status.h"
+
+/*
+ * Return the IP address for the given interface or "no IP" if the
+ * interface is up and running but hasn't got an IP address yet
+ *
+ */
+const char *get_ip_addr(const char *interface) {
+        static char part[512];
+        socklen_t len = sizeof(struct sockaddr_in);
+        memset(part, 0, sizeof(part));
+
+        struct ifaddrs *ifaddr, *addrp;
+
+        getifaddrs(&ifaddr);
+
+        if (ifaddr == NULL) {
+                (void)snprintf(part, sizeof(part), "E: down");
+                return part;
+        }
+
+        addrp = ifaddr;
+
+        /* Skip until we are at the AF_INET address of interface */
+        for (addrp = ifaddr;
+
+             (addrp != NULL &&
+              (strcmp(addrp->ifa_name, interface) != 0 ||
+               addrp->ifa_addr == NULL ||
+               addrp->ifa_addr->sa_family != AF_INET));
+
+             addrp = addrp->ifa_next) {
+                /* Check if the interface is down */
+                if (strcmp(addrp->ifa_name, interface) == 0 &&
+                    (addrp->ifa_flags & IFF_RUNNING) == 0) {
+                        freeifaddrs(ifaddr);
+                        return NULL;
+                }
+        }
+
+        if (addrp == NULL) {
+                freeifaddrs(ifaddr);
+                return "no IP";
+        }
+
+        int ret;
+        if ((ret = getnameinfo(addrp->ifa_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
+                fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
+                freeifaddrs(ifaddr);
+                return "no IP";
+        }
+
+        freeifaddrs(ifaddr);
+        return part;
+}
+