seitan: Add netlink, sendto()/sendmsg(), iovec handling, demo with routes

A bit rough at the moment, but it does the trick. Bonus: setsockopt()
(with magic values only, not used in any demo yet).

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/seitan.c b/seitan.c
index fbfeb42..17ec63e 100644
--- a/seitan.c
+++ b/seitan.c
@@ -195,6 +195,24 @@ static int recvfd(int sockfd)
 	return fd;
 }
 
+static void gluten_relocate(struct gluten *g)
+{
+	unsigned i;
+
+	for (i = 0; i < 256; i++) {
+		void **p;
+
+		switch (g->header.relocation[i].type) {
+		case OFFSET_DATA:
+			p = gluten_write_ptr(g, g->header.relocation[i]);
+			*p = (intptr_t)*p + g->data;
+			break;
+		default:
+			;
+		}
+	}
+}
+
 int main(int argc, char **argv)
 {
 	char req_b[BUFSIZ];
@@ -212,11 +230,14 @@ int main(int argc, char **argv)
 	arguments.uid = getuid();
 	arguments.gid = getgid();
 	parse(argc, argv, &arguments);
+
 	fd = open(arguments.input_file, O_CLOEXEC | O_RDONLY);
 	if (read(fd, &g, sizeof(g)) != sizeof(g))
 		die("Failed to read gluten file");
 	close(fd);
 
+	gluten_relocate(&g);
+
 	if (arguments.pid > 0) {
 		if ((pidfd = syscall(SYS_pidfd_open, arguments.pid, 0)) < 0)
 			die("  pidfd_open");