link: Add ONET link interface

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/src/link/link_subr.c b/src/link/link_subr.c
new file mode 100644
index 0000000..d1a977d
--- /dev/null
+++ b/src/link/link_subr.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/errno.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <net/ethernet.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include "link.h"
+
+int
+onet_open(const char *iface, struct onet_link *res)
+{
+    struct ifreq ifr;
+    int error;
+
+    if (res == NULL) {
+        return -EINVAL;
+    }
+
+    /* Open a raw socket */
+    res->sockfd = socket(AF_PACKET, SOCK_RAW, IPPROTO_RAW);
+    if (res->sockfd < 0) {
+        return res->sockfd;
+    }
+
+    /* Set the interface we want to use */
+    strlcpy(ifr.ifr_name, iface, IFNAMSIZ);
+    error = ioctl(res->sockfd, SIOGIFINDEX, &ifr);
+    if (error < 0) {
+        printf("ioctl[SIOGIFHWADDR]: could not read hwaddr \"%s\"\n", iface);
+        return error;
+    }
+
+    res->iface_idx = ifr.ifr_ifindex;
+
+    /* Get the hardware address */
+    error = ioctl(res->sockfd, SIOCGIFHWADDR, &ifr);
+    if (error < 0) {
+        printf("ioctl[SIOGIFHWADDR]: could not read hwaddr \"%s\"\n", iface);
+        return error;
+    }
+
+    res->hwaddr = mac_swap((void *)ifr.ifr_hwaddr.sa_data);
+    return 0;
+}
+
+int
+onet_close(struct onet_link *olp)
+{
+    if (olp == NULL) {
+        return -EINVAL;
+    }
+
+    close(olp->sockfd);
+}