From c78b87e29df0217d6f277d58559b0d6926508948 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sat, 9 Mar 2013 15:30:42 +0100
Subject: Initial commit

---
 .gitignore  |   2 ++
 Makefile    |   8 +++++
 ethersend.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 128 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 ethersend.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..07e611d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*~
+/ethersend
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..08a9322
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+CFLAGS = -Wall
+
+all: ethersend
+
+clean:
+	rm -f ethersend
+
+.PHONY: clean
diff --git a/ethersend.c b/ethersend.c
new file mode 100644
index 0000000..f210401
--- /dev/null
+++ b/ethersend.c
@@ -0,0 +1,118 @@
+/*
+  Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  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.
+
+  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 HOLDER 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 <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <arpa/inet.h>
+
+#include <linux/if_ether.h>
+
+#include <net/if.h>
+
+#include <netpacket/packet.h>
+
+#include <sys/socket.h>
+#include <sys/types.h>
+
+
+static void usage(const char *name) {
+	fprintf(stderr, "Usage: %s interface dest ethertype\n", name);
+}
+
+int main(int argc, char *argv[]) {
+	if (argc != 4) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	unsigned int ifindex;
+	uint8_t d[ETH_ALEN];
+	uint16_t ethertype;
+
+	ifindex = if_nametoindex(argv[1]);
+	if (!ifindex) {
+		fprintf(stderr, "Error: invalid interface\n");
+		usage(argv[0]);
+		return 1;
+	}
+
+	if (sscanf(argv[2], "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &d[0], &d[1], &d[2], &d[3], &d[4], &d[5]) != 6) {
+		fprintf(stderr, "Error: invalid destination address\n");
+		usage(argv[0]);
+		return 1;
+	}
+
+	if (sscanf(argv[3], "%hx", &ethertype) != 1) {
+		fprintf(stderr, "Error: invalid ethertype\n");
+		usage(argv[0]);
+		return 1;
+	}
+
+	int fd = socket(AF_PACKET, SOCK_DGRAM, htons(ethertype));
+	if (fd < 0) {
+		fprintf(stderr, "Error: socket: %m\n");
+		return 1;
+	}
+
+	const size_t buf_len = 65536;
+	uint8_t buf[buf_len];
+	size_t pos = 0;
+
+	while (!feof(stdin) && !ferror(stdin)) {
+		int read = fread(buf+pos, 1, buf_len-pos, stdin);
+
+		if (read <= 0)
+			break;
+
+		pos += read;
+	}
+
+	if (pos < 46) {
+		/* don't send invalid short frames */
+		memset(buf+pos, 0, 46-pos);
+		pos = 46;
+	}
+	
+	struct sockaddr_ll sa;
+	memset(&sa, 0, sizeof(sa));
+	sa.sll_family = AF_PACKET;
+	sa.sll_protocol = htons(ethertype);
+	sa.sll_ifindex = ifindex;
+	sa.sll_halen = ETH_ALEN;
+	memcpy(sa.sll_addr, d, ETH_ALEN);
+
+	if (sendto(fd, buf, pos, 0, (struct sockaddr*)&sa, sizeof(sa)) < 0) {
+		fprintf(stderr, "Error: sendto: %m\n");
+		return 1;
+	}
+
+	close(fd);
+
+	return 0;
+}
-- 
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