package/maccalc: a simple mac address manipulation utility

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28004 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/maccalc/Makefile b/package/maccalc/Makefile
new file mode 100644 (file)
index 0000000..09cdfc8
--- /dev/null
+++ b/package/maccalc/Makefile
@@ -0,0 +1,47 @@
+#
+# Copyright (C) 2011 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=maccalc
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/maccalc
+  SECTION:=utils
+  CATEGORY:=Utilities
+  TITLE:=MAC address calculation
+endef
+
+define Package/maccalc/description
+ This package contains a MAC address manipulation utility.
+endef
+
+define Build/Prepare
+       mkdir -p $(PKG_BUILD_DIR)
+       $(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+       $(MAKE) -C $(PKG_BUILD_DIR) \
+               CC="$(TARGET_CC)" \
+               CFLAGS="$(TARGET_CFLAGS) -Wall" \
+               LDFLAGS="$(TARGET_LDFLAGS)"
+endef
+
+define Package/maccalc/install
+       $(INSTALL_DIR) $(1)/usr/sbin
+       $(INSTALL_BIN) $(PKG_BUILD_DIR)/maccalc $(1)/usr/sbin/
+endef
+
+$(eval $(call BuildPackage,maccalc))

diff --git a/package/maccalc/src/Makefile b/package/maccalc/src/Makefile
new file mode 100644 (file)
index 0000000..486badb
--- /dev/null
+++ b/package/maccalc/src/Makefile
@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS = -Wall
+OBJS = main.o
+
+all: maccalc
+
+%.o: %.c
+       $(CC) $(CFLAGS) -c -o $@ $<
+
+maccalc: $(OBJS)
+       $(CC) -o $@ $(OBJS)
+
+clean:
+       rm -f maccalc *.o

diff --git a/package/maccalc/src/main.c b/package/maccalc/src/main.c
new file mode 100644 (file)
index 0000000..e1e12cd
--- /dev/null
+++ b/package/maccalc/src/main.c
@@ -0,0 +1,227 @@
+/*
+ * MAC address manupulation utility
+ *
+ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+
+#define MAC_ADDRESS_LEN                6
+
+#define ERR_INVALID            1
+#define ERR_IO                 2
+
+static void usage(void);
+
+char *maccalc_name;
+
+static int parse_mac(const char *mac_str, unsigned char *buf)
+{
+       int t;
+
+       t = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+                  &buf[0], &buf[1], &buf[2], &buf[3], &buf[4], &buf[5]);
+
+       if (t != MAC_ADDRESS_LEN)
+               return ERR_INVALID;
+
+       return 0;
+}
+
+static void print_mac(unsigned char *buf)
+{
+       printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
+              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+}
+
+static int maccalc_do_add(int argc, const char *argv[])
+{
+       unsigned char mac[MAC_ADDRESS_LEN];
+       uint32_t t;
+       int err;
+       int i;
+
+       if (argc != 2) {
+               usage();
+               return ERR_INVALID;
+       }
+
+       err = parse_mac(argv[0], mac);
+       if (err)
+               return err;
+
+       i = atoi(argv[1]);
+
+       t = (mac[3] << 16) | (mac[4] << 8) | mac[5];
+       t += i;
+       mac[3] = (t >> 16) & 0xff;
+       mac[4] = (t >> 8) & 0xff;
+       mac[5] = t & 0xff;
+
+       print_mac(mac);
+       return 0;
+}
+
+static int maccalc_do_logical(int argc, const char *argv[],
+                             unsigned char (*op)(unsigned char n1,
+                                                 unsigned char n2))
+{
+       unsigned char mac1[MAC_ADDRESS_LEN];
+       unsigned char mac2[MAC_ADDRESS_LEN];
+       int err;
+       int i;
+
+       if (argc != 2) {
+               usage();
+               return ERR_INVALID;
+       }
+
+       err = parse_mac(argv[0], mac1);
+       if (err)
+               return err;
+
+       err = parse_mac(argv[1], mac2);
+       if (err)
+               return err;
+
+       for (i = 0; i < MAC_ADDRESS_LEN; i++)
+               mac1[i] = op(mac1[i],mac2[i]);
+
+       print_mac(mac1);
+       return 0;
+}
+
+static int maccalc_do_mac2bin(int argc, const char *argv[])
+{
+       unsigned char mac[MAC_ADDRESS_LEN];
+       ssize_t c;
+       int err;
+
+       if (argc != 1) {
+               usage();
+               return ERR_INVALID;
+       }
+
+       err = parse_mac(argv[0], mac);
+       if (err)
+               return err;
+
+       c = write(STDOUT_FILENO, mac, sizeof(mac));
+       if (c != sizeof(mac)) {
+               fprintf(stderr, "failed to write to stdout\n");
+               return ERR_IO;
+       }
+
+       return 0;
+}
+
+static int maccalc_do_bin2mac(int argc, const char *argv[])
+{
+       unsigned char mac[MAC_ADDRESS_LEN];
+       ssize_t c;
+
+       if (argc != 0) {
+               usage();
+               return ERR_INVALID;
+       }
+
+       c = read(STDIN_FILENO, mac, sizeof(mac));
+       if (c != sizeof(mac)) {
+               fprintf(stderr, "failed to read from stdin\n");
+               return ERR_IO;
+       }
+
+       print_mac(mac);
+       return 0;
+}
+
+static unsigned char op_or(unsigned char n1, unsigned char n2)
+{
+       return n1 | n2;
+}
+
+static int maccalc_do_or(int argc, const char *argv[])
+{
+       return maccalc_do_logical(argc, argv, op_or);
+}
+
+static unsigned char op_and(unsigned char n1, unsigned char n2)
+{
+       return n1 & n2;
+}
+
+static int maccalc_do_and(int argc, const char *argv[])
+{
+       return maccalc_do_logical(argc, argv, op_and);
+}
+
+static unsigned char op_xor(unsigned char n1, unsigned char n2)
+{
+       return n1 ^ n2;
+}
+
+static int maccalc_do_xor(int argc, const char *argv[])
+{
+       return maccalc_do_logical(argc, argv, op_xor);
+}
+
+static void usage(void)
+{
+       fprintf(stderr,
+               "Usage: %s <command>\n"
+               "valid commands:\n"
+               "  add <mac> <number>\n"
+               "  and|or|xor <mac1> <mac2>\n"
+               "  mac2bin <mac>\n"
+               "  bin2mac\n",
+               maccalc_name);
+}
+
+int main(int argc, const char *argv[])
+{
+       int (*op)(int argc, const char *argv[]);
+       int ret;
+
+       maccalc_name = (char *) argv[0];
+
+       if (argc < 2) {
+               usage();
+               return EXIT_FAILURE;
+       }
+
+       if (strcmp(argv[1], "add") == 0) {
+               op = maccalc_do_add;
+       } else if (strcmp(argv[1], "and") == 0) {
+               op = maccalc_do_and;
+       } else if (strcmp(argv[1], "or") == 0) {
+               op = maccalc_do_or;
+       } else if (strcmp(argv[1], "xor") == 0) {
+               op = maccalc_do_xor;
+       } else if (strcmp(argv[1], "mac2bin") == 0) {
+               op = maccalc_do_mac2bin;
+       } else if (strcmp(argv[1], "bin2mac") == 0) {
+               op = maccalc_do_bin2mac;
+       } else {
+               fprintf(stderr, "unknown command '%s'\n", argv[1]);
+               usage();
+               return EXIT_FAILURE;
+       }
+
+       argc -= 2;
+       argv += 2;
+
+       ret = op(argc, argv);
+       if (ret)
+               return EXIT_FAILURE;
+
+       return EXIT_SUCCESS;
+}