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-rw-r--r--ifaddr.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/ifaddr.c b/ifaddr.c
new file mode 100644
index 0000000..5dbde91
--- /dev/null
+++ b/ifaddr.c
@@ -0,0 +1,55 @@
+/* $Id$ */
+/*
+ * Copyright (c) 2004 demon <demon@vhost.dyndns.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+#include <err.h>
+#include <string.h>
+#include <unistd.h>
+#include "ifaddr.h"
+
+int
+if_ntoa(char *if_name, char **if_addr)
+{
+ struct ifreq ifr;
+ struct sockaddr_in sin;
+ int fd;
+
+ memset(&ifr, '\0', sizeof(ifr));
+
+ strncpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name) - 1);
+
+ if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+ err(1, "socket()");
+
+ if (ioctl(fd, SIOCGIFADDR, &ifr) < 0) {
+ close(fd);
+ err(1, "ioctl()");
+ }
+
+ memcpy(&sin, &(ifr.ifr_addr), sizeof(sin));
+
+ *if_addr = inet_ntoa(sin.sin_addr);
+
+ close(fd);
+ return 0;
+}