From e0e878ffd35cb77d411fa2604aba7ee10a3573e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A9lix=20Arreola=20Rodr=C3=ADguez?=
 <fgatuno.123@gmail.com>
Date: Thu, 9 Aug 2018 23:59:02 -0500
Subject: [PATCH] Agrego comando para levantar interfaces.

---
 src/interfaces.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++-
 src/interfaces.h |  1 +
 2 files changed, 84 insertions(+), 1 deletion(-)

diff --git a/src/interfaces.c b/src/interfaces.c
index cdad6ae..adb2eb0 100644
--- a/src/interfaces.c
+++ b/src/interfaces.c
@@ -53,6 +53,12 @@ typedef struct {
 	struct rtgenmsg gen;
 } nl_req_t;
 
+typedef struct {
+	struct nlmsghdr hdr;
+	struct ifinfomsg i;
+	char buf[1024];
+} nl_req_if;
+
 Interface * interfaces_locate_by_index (Interface *list, int index) {
 	Interface *iface;
 	
@@ -522,7 +528,7 @@ void interfaces_manual_add_ipv4 (int sock, Interface *interface, IPv4 *address)
 	// update nlmsghdr length
 	nl->nlmsg_len = NLMSG_ALIGN(nl->nlmsg_len) + rta->rta_len;
 	
-	// del interface address
+	// add interface address
 	len = sizeof (buffer) - nl->nlmsg_len;
 	rta = (struct rtattr*) RTA_NEXT (rta, len);
 	rta->rta_type = IFA_ADDRESS;
@@ -573,6 +579,82 @@ void interfaces_manual_add_ipv4 (int sock, Interface *interface, IPv4 *address)
 	}
 }
 
+void interfaces_bring_up (int sock, Interface *interface) {
+	struct msghdr rtnl_msg;
+	struct iovec io;
+	nl_req_if req;
+	struct sockaddr_nl kernel;
+	char reply[8192];
+	int len;
+	
+	struct nlmsghdr *nl;
+	struct nlmsgerr *l_err;
+	
+	struct sockaddr_nl local_nl;
+	socklen_t local_size;
+	
+	/* Recuperar el puerto local del netlink */
+	local_size = sizeof (local_nl);
+	getsockname (sock, (struct sockaddr *) &local_nl, &local_size);
+	
+	memset(&rtnl_msg, 0, sizeof(rtnl_msg));
+	memset(&kernel, 0, sizeof(kernel));
+	memset(&req, 0, sizeof(req));
+	
+	kernel.nl_family = AF_NETLINK; /* fill-in kernel address (destination of our message) */
+	kernel.nl_groups = 0;
+	
+	req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.hdr.nlmsg_type = RTM_NEWLINK;
+	req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	req.hdr.nlmsg_seq = global_nl_seq++;
+	req.hdr.nlmsg_pid = local_nl.nl_pid;
+	
+	req.i.ifi_family = AF_PACKET;
+	req.i.ifi_index = interface->index;
+	req.i.ifi_change |= IFF_UP;
+	req.i.ifi_flags |= IFF_UP;
+	
+	io.iov_base = &req;
+	io.iov_len = req.hdr.nlmsg_len;
+	rtnl_msg.msg_iov = &io;
+	rtnl_msg.msg_iovlen = 1;
+	rtnl_msg.msg_name = &kernel;
+	rtnl_msg.msg_namelen = sizeof(kernel);
+	
+	len = sendmsg (sock, (struct msghdr *) &rtnl_msg, 0);
+	
+	/* Esperar la respuesta */
+	memset (&io, 0, sizeof (io));
+	memset (&rtnl_msg, 0, sizeof (rtnl_msg));
+	
+	io.iov_base = reply;
+	io.iov_len = sizeof (reply);
+	rtnl_msg.msg_iov = &io;
+	rtnl_msg.msg_iovlen = 1;
+	rtnl_msg.msg_name = &kernel;
+	rtnl_msg.msg_namelen = sizeof (kernel);
+	
+	len = recvmsg (sock, &rtnl_msg, 0);
+	nl = (struct nlmsghdr *) reply;
+	for (; NLMSG_OK(nl, len); nl = NLMSG_NEXT(nl, len)) {
+		if (nl->nlmsg_type == NLMSG_DONE) {
+			printf ("Bring UP Msg type: DONE!\n");
+			break;
+		}
+		if (nl->nlmsg_type == NLMSG_ERROR) {
+			l_err = (struct nlmsgerr*) NLMSG_DATA (nl);
+			if (nl->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) {
+				printf ("Bring up Error tamaño truncado\n");
+			} else if (l_err->error != 0) {
+				// Error:
+				printf ("Bring up Error: %i\n", l_err->error);
+			}
+			break;
+		}
+	}
+}
+
 void interfaces_clear_all_ipv4_address (NetworkInadorHandle *handle, Interface *interface) {
 	IPv4 *address;
 	
diff --git a/src/interfaces.h b/src/interfaces.h
index 292f122..8bece77 100644
--- a/src/interfaces.h
+++ b/src/interfaces.h
@@ -40,6 +40,7 @@ void interfaces_del_ipv4 (NetworkInadorHandle *handle, struct nlmsghdr *h);
 
 void interfaces_clear_all_ipv4_address (NetworkInadorHandle *handle, Interface *interface);
 void interfaces_manual_add_ipv4 (int sock, Interface *interface, IPv4 *address);
+void interfaces_bring_up (int sock, Interface *interface);
 
 #endif