- new applet brctl

text	   data	    bss	    dec	    hex	filename
    289	     20	      0	    309	    135	networking/brctl.o
    335	     23	      0	    358	    166	networking/brctl-verbose-ops.o

include/applets.h

@@ -86,6 +86,7 @@ USE_AWK(APPLET_NOEXEC(awk, awk, _BB_DIR_USR_BIN, _BB_SUID_NEVER, awk))
 USE_BASENAME(APPLET_NOFORK(basename, basename, _BB_DIR_USR_BIN, _BB_SUID_NEVER, basename))
 USE_BBCONFIG(APPLET(bbconfig, _BB_DIR_BIN, _BB_SUID_NEVER))
 //USE_BBSH(APPLET(bbsh, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_BRCTL(APPLET(brctl, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_NEVER, bzcat))
 USE_BZIP2(APPLET(bzip2, _BB_DIR_USR_BIN, _BB_SUID_NEVER))

include/usage.h

@@ -119,6 +119,16 @@
        "$ basename /foo/bar.txt .txt\n" \
        "bar"
 
+#define brctl_trivial_usage \
+       "COMMAND [BRIDGE [INTERFACE]]"
+#define brctl_full_usage \
+       "Manage ethernet bridges." \
+       "\n\nCommands:\n" \
+       "	addbr <bridge>		Create <bridge>\n" \
+       "	delbr <bridge>		Delete <bridge>\n" \
+       "	addif <bridge> <iface>	Add <iface> to <bridge>\n" \
+       "	delif <bridge> <iface>	Delete <iface> from <bridge>"
+
 #define bunzip2_trivial_usage \
        "[OPTION]... [FILE]"
 #define bunzip2_full_usage \

networking/Config.in

@@ -47,6 +47,12 @@ config ARPING
 	help
 	  Ping hosts by ARP packets.
 
+config BRCTL
+	bool "brctl"
+	default n
+	help
+	  Manage ethernet bridges.
+
 config DNSD
 	bool "dnsd"
 	default n

networking/Kbuild

@@ -7,6 +7,7 @@
 lib-y:=
 lib-$(CONFIG_ARP)          += arp.o interface.o
 lib-$(CONFIG_ARPING)       += arping.o
+lib-$(CONFIG_BRCTL)        += brctl.o
 lib-$(CONFIG_DNSD)         += dnsd.o
 lib-$(CONFIG_ETHER_WAKE)   += ether-wake.o
 lib-$(CONFIG_FAKEIDENTD)   += isrv_identd.o isrv.o

networking/brctl.c

@@ -0,0 +1,87 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Small implementation of brctl for busybox.
+ *
+ * Copyright (C) 2008 by Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+#include "libbb.h"
+#include <linux/sockios.h>
+#include <net/if.h>
+
+#ifdef ENABLE_FEATURE_BRCTL_SHOW
+#error Remove these
+#endif
+#define ENABLE_FEATURE_BRCTL_SHOW 0
+#define USE_FEATURE_BRCTL_SHOW(...)
+
+
+/* Fancy diagnostics -- printing add/del -- costs 49 bytes. */
+#if 0
+#define BRCTL_VERBOSE(...) __VA_ARGS__
+#else
+#define BRCTL_VERBOSE(...)
+#endif
+
+int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int brctl_main(int argc, char **argv)
+{
+	int fd;
+	static const char keywords[] ALIGN1 =
+		"addbr\0" "delbr\0" "addif\0" "delif\0"
+		USE_FEATURE_BRCTL_SHOW("show\0");
+	enum { ARG_addbr = 1, ARG_delbr, ARG_addif, ARG_delif
+		  USE_FEATURE_BRCTL_SHOW(, ARG_show) };
+	smalluint key;
+	static char info[] = BRCTL_VERBOSE("%s ")"bridge %s\0 iface %s";
+
+	argv++;
+	while (*argv) {
+		BRCTL_VERBOSE(char *op;)
+
+		key = index_in_strings(keywords, *argv) + 1;
+		if (key == 0) /* no match found in keywords array, bail out. */
+			bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
+		argv++;
+#if ENABLE_FEATURE_BRCTL_SHOW
+		if (key == ARG_show) { /* show */
+			;
+		}
+#endif
+		BRCTL_VERBOSE(op = (char*)((key % 2) ? "add" : "del");)
+		fd = xsocket(AF_INET, SOCK_STREAM, 0);
+		if (key < 3) {/* addbr or delbr */
+			char *br;
+
+			br = *(argv++);
+			if (ioctl(fd, key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR, br) < 0)
+			{
+				info[9 BRCTL_VERBOSE(+3)] = '\0';
+				bb_perror_msg_and_die(info, BRCTL_VERBOSE(op,) br);
+			}
+		}
+		if (key > 2) { /* addif or delif */
+			struct ifreq ifr;
+			char *br, *brif;
+
+			br = *(argv++);
+			if (!*argv)
+				bb_show_usage();
+			brif = *(argv++);
+
+			if (!(ifr.ifr_ifindex = if_nametoindex(brif))) {
+				bb_perror_msg_and_die(info+11 BRCTL_VERBOSE(+3), brif);
+			}
+			safe_strncpy(ifr.ifr_name, br, IFNAMSIZ);
+			if (ioctl(fd,
+					  key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF, &ifr) < 0) {
+				info[9 BRCTL_VERBOSE(+3)] = ',';
+				bb_perror_msg_and_die (info, BRCTL_VERBOSE(op,) br, brif);
+			}
+		}
+		if (ENABLE_FEATURE_CLEAN_UP)
+			close(fd);
+	}
+	return EXIT_SUCCESS;
+}