socketbind - new port submission

	This library allows you to bind any application which is
	dynamically linked with libc to certain IP address.  It
	provides convient way to bind socket's source IP to one of
	the multiple IP's available on computer.

PR:		ports/50147
Submitted by:	Gaspar Chilingarov <nm@web.am>

1 files changed, 46 insertions, 0 deletions

diff --git a/net/socketbind/files/socketbind.c b/net/socketbind/files/socketbind.c
new file mode 100644
index 000000000000..51d929d9b794
--- /dev/null
+++ b/net/socketbind/files/socketbind.c
@@ -0,0 +1,46 @@
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <dlfcn.h>
+
+static void *socket_p, *dl_handle;
+
+static struct sockaddr_in bind_addr;
+static int	   do_bind;
+
+int socket(int domain, int type, int protocol) {
+	auto int res;
+	if (dl_handle == NULL) {
+		char *str;
+		dl_handle = dlopen("/usr/lib/libc.so", RTLD_LAZY);
+		if (dl_handle == NULL) 
+			return -1;
+		socket_p = dlsym(dl_handle, "socket");
+		if (!socket_p)
+			return -1;
+#ifdef DEBUG
+		printf("Loaded socket %x\n", socket_p);
+#endif
+
+		if ((str = getenv("BINDTO")) != NULL) {
+#ifdef DEBUG
+			printf("Thinking about bind\n");
+#endif
+			if (ascii2addr(AF_INET, str, &bind_addr.sin_addr)) {
+				do_bind = 1;
+				bind_addr.sin_len = INET_ADDRSTRLEN;
+				bind_addr.sin_family = AF_INET;
+#ifdef DEBUG
+				printf("WILL DO BIND %s, %x\n", str, bind_addr.sin_addr.s_addr);
+#endif
+			}
+		}
+	}
+	res = ((int(*)(int a, int b, int c))socket_p)(domain, type, protocol); 
+	if (do_bind) {
+		bind(res, (struct sockaddr*)&bind_addr, INET_ADDRSTRLEN);
+	}
+	return res;
+};
+