This patch from Bart Visscher <magick@linux-fan.com> adds

IPV6 support to busybox.  This patch does the following:
    * Add IPv6 support to libbb
    * Enable IPv6 interface address display
    * Add IPv6 config option
    * Adds ping6, an adaptation of the ping applet for IPv6
    * Adds support routines for ping6:
	- xgethostbyname2
	- create_icmp6_socket
    * Adds ifconfig support for IPv6
    * Add support IPv6 to netstat
    * Add IPv6 support to route
Thanks Bart!

5 files changed, 238 insertions, 7 deletions

diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index 2af70f8c7..70cc26dc1 100644
--- a/libbb/Makefile.in
+++ b/libbb/Makefile.in
@@ -40,7 +40,9 @@ LIBBB_SRC:= \
 	dirname.c make_directory.c create_icmp_socket.c u_signal_names.c arith.c \
 	simplify_path.c inet_common.c inode_hash.c obscure.c pwd2spwd.c xfuncs.c \
 	correct_password.c change_identity.c setup_environment.c run_shell.c \
-	pw_encrypt.c restricted_shell.c
+	pw_encrypt.c restricted_shell.c xgethostbyname2.c create_icmp6_socket.c \
+	xconnect.c
+
 LIBBB_OBJS=$(patsubst %.c,$(LIBBB_DIR)%.o, $(LIBBB_SRC))
 
 LIBBB_MSRC:=$(LIBBB_DIR)messages.c
diff --git a/libbb/create_icmp6_socket.c b/libbb/create_icmp6_socket.c
new file mode 100644
index 000000000..a09565605
--- /dev/null
+++ b/libbb/create_icmp6_socket.c
@@ -0,0 +1,39 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * create raw socket for icmp (IPv6 version) protocol test permision
+ * and drop root privilegies if running setuid
+ *
+ */
+
+#include <sys/types.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <unistd.h>
+#include "libbb.h"
+
+#if CONFIG_FEATURE_IPV6
+int create_icmp6_socket(void)
+{
+	struct protoent *proto;
+	int sock;
+
+	proto = getprotobyname("ipv6-icmp");
+	/* if getprotobyname failed, just silently force
+	 * proto->p_proto to have the correct value for "ipv6-icmp" */
+	if ((sock = socket(AF_INET6, SOCK_RAW,
+			(proto ? proto->p_proto : IPPROTO_ICMPV6))) < 0) {
+		if (errno == EPERM)
+			error_msg_and_die("permission denied. (are you root?)");
+		else
+			perror_msg_and_die(can_not_create_raw_socket);
+	}
+
+	/* drop root privs if running setuid */
+	setuid(getuid());
+
+	return sock;
+}
+#endif
diff --git a/libbb/inet_common.c b/libbb/inet_common.c
index c1e5953fe..c7bf409c4 100644
--- a/libbb/inet_common.c
+++ b/libbb/inet_common.c
@@ -4,7 +4,7 @@
  *
  * Heavily modified by Manuel Novoa III       Mar 12, 2001
  *
- * Version:     $Id: inet_common.c,v 1.2 2002/06/06 12:11:55 andersen Exp $
+ * Version:     $Id: inet_common.c,v 1.3 2002/07/03 11:46:36 andersen Exp $
  *
  */
 
@@ -177,3 +177,65 @@ int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
 
     return (0);
 }
+
+#if CONFIG_FEATURE_IPV6
+
+int INET6_resolve(char *name, struct sockaddr_in6 *sin6)
+{
+    struct addrinfo req, *ai;
+    int s;
+
+    memset (&req, '\0', sizeof req);
+    req.ai_family = AF_INET6;
+    if ((s = getaddrinfo(name, NULL, &req, &ai))) {
+	fprintf(stderr, "getaddrinfo: %s: %d\n", name, s);
+	return -1;
+    }
+    memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
+
+    freeaddrinfo(ai);
+
+    return (0);
+}
+
+#ifndef IN6_IS_ADDR_UNSPECIFIED
+#define IN6_IS_ADDR_UNSPECIFIED(a) \
+        (((__u32 *) (a))[0] == 0 && ((__u32 *) (a))[1] == 0 && \
+         ((__u32 *) (a))[2] == 0 && ((__u32 *) (a))[3] == 0)
+#endif
+
+
+int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6, int numeric)
+{
+    int s;
+
+    /* Grmpf. -FvK */
+    if (sin6->sin6_family != AF_INET6) {
+#ifdef DEBUG
+	fprintf(stderr, _("rresolve: unsupport address family %d !\n"),
+		sin6->sin6_family);
+#endif
+	errno = EAFNOSUPPORT;
+	return (-1);
+    }
+    if (numeric & 0x7FFF) {
+	inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
+	return (0);
+    }
+    if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
+        if (numeric & 0x8000)
+	    strcpy(name, "default");
+	else
+	    strcpy(name, "*");
+	return (0);
+    }
+
+    if ((s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
+			 name, len , NULL, 0, 0))) {
+	fputs("getnameinfo failed\n", stderr);
+	return -1;
+    }
+    return (0);
+}
+
+#endif	/* CONFIG_FEATURE_IPV6 */
diff --git a/libbb/interface.c b/libbb/interface.c
index 9ecb81b9f..5800e0f6a 100644
--- a/libbb/interface.c
+++ b/libbb/interface.c
@@ -15,7 +15,7 @@
  *              that either displays or sets the characteristics of
  *              one or more of the system's networking interfaces.
  *
- * Version:     $Id: interface.c,v 1.7 2001/11/10 11:22:46 andersen Exp $
+ * Version:     $Id: interface.c,v 1.8 2002/07/03 11:46:36 andersen Exp $
  *
  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  *              and others.  Copyright 1993 MicroWalt Corporation
@@ -52,6 +52,10 @@
 #undef HAVE_AFECONET
 #undef HAVE_AFASH
 
+#if CONFIG_FEATURE_IPV6
+#define HAVE_AFINET6 1
+#endif
+
 /* 
  * 
  * Device Hardware types.
@@ -77,6 +81,7 @@
 
 #define _(x) x
 #define _PATH_PROCNET_DEV               "/proc/net/dev"
+#define _PATH_PROCNET_IFINET6           "/proc/net/if_inet6"
 #define new(p) ((p) = xcalloc(1,sizeof(*(p))))
 #define KRELEASE(maj,min,patch) ((maj) * 65536 + (min)*256 + (patch))
 
@@ -425,6 +430,76 @@ static struct aftype inet_aftype =
 
 #endif				/* HAVE_AFINET */
 
+#if HAVE_AFINET6
+
+#ifdef KEEP_UNUSED
+static void INET6_reserror(char *text)
+{
+    herror(text);
+}
+
+/* Display an Internet socket address. */
+static char *INET6_print(unsigned char *ptr)
+{
+    static char name[80];
+
+    inet_ntop(AF_INET6, (struct in6_addr *) ptr, name, 80);
+    return name;
+}
+#endif /* KEEP_UNUSED */
+
+/* Display an Internet socket address. */
+/* dirty! struct sockaddr usually doesn't suffer for inet6 addresses, fst. */
+static char *INET6_sprint(struct sockaddr *sap, int numeric)
+{
+    static char buff[128];
+
+    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
+	return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));
+    if (INET6_rresolve(buff, sizeof(buff), (struct sockaddr_in6 *) sap, numeric) != 0)
+	return safe_strncpy(buff, _("[UNKNOWN]"), sizeof(buff));
+    return (buff);
+}
+
+#ifdef KEEP_UNUSED
+static int INET6_getsock(char *bufp, struct sockaddr *sap)
+{
+    struct sockaddr_in6 *sin6;
+
+    sin6 = (struct sockaddr_in6 *) sap;
+    sin6->sin6_family = AF_INET6;
+    sin6->sin6_port = 0;
+
+    if (inet_pton(AF_INET6, bufp, sin6->sin6_addr.s6_addr) <= 0)
+	return (-1);
+
+    return 16;			/* ?;) */
+}
+
+static int INET6_input(int type, char *bufp, struct sockaddr *sap)
+{
+    switch (type) {
+    case 1:
+	return (INET6_getsock(bufp, sap));
+    default:
+	return (INET6_resolve(bufp, (struct sockaddr_in6 *) sap));
+    }
+}
+#endif /* KEEP_UNUSED */
+
+static struct aftype inet6_aftype =
+{
+    "inet6", "IPv6", AF_INET6, sizeof(struct in6_addr),
+    NULL /* UNUSED INET6_print */, INET6_sprint,
+	NULL /* UNUSED INET6_input */, NULL /* UNUSED INET6_reserror */,
+    NULL /*INET6_rprint */ , NULL /*INET6_rinput */ ,
+    NULL /* UNUSED INET6_getnetmask */,
+    -1,
+    NULL
+};
+
+#endif				/* HAVE_AFINET6 */
+
 /* Display an UNSPEC address. */
 static char *UNSPEC_print(unsigned char *ptr)
 {
@@ -1709,7 +1784,6 @@ static void ife_print(struct interface *ptr)
     char addr6[40], devname[20];
     struct sockaddr_in6 sap;
     int plen, scope, dad_status, if_idx;
-    extern struct aftype inet6_aftype;
     char addr6p[8][5];
 #endif
 
@@ -1756,8 +1830,24 @@ static void ife_print(struct interface *ptr)
 #endif
 
 #if HAVE_AFINET6
-    /* FIXME: should be integrated into interface.c.   */
 
+#define IPV6_ADDR_ANY           0x0000U
+
+#define IPV6_ADDR_UNICAST       0x0001U
+#define IPV6_ADDR_MULTICAST     0x0002U
+#define IPV6_ADDR_ANYCAST       0x0004U
+
+#define IPV6_ADDR_LOOPBACK      0x0010U
+#define IPV6_ADDR_LINKLOCAL     0x0020U
+#define IPV6_ADDR_SITELOCAL     0x0040U
+  
+#define IPV6_ADDR_COMPATv4      0x0080U
+    
+#define IPV6_ADDR_SCOPE_MASK    0x00f0U
+    
+#define IPV6_ADDR_MAPPED        0x1000U
+#define IPV6_ADDR_RESERVED      0x2000U         /* reserved address space */
+    
     if ((f = fopen(_PATH_PROCNET_IFINET6, "r")) != NULL) {
 	while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
 		      addr6p[0], addr6p[1], addr6p[2], addr6p[3],
@@ -1767,11 +1857,12 @@ static void ife_print(struct interface *ptr)
 		sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
 			addr6p[0], addr6p[1], addr6p[2], addr6p[3],
 			addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
-		inet6_aftype.input(1, addr6, (struct sockaddr *) &sap);
+		inet_pton(AF_INET6, addr6, (struct sockaddr *) &sap.sin6_addr);
+		sap.sin6_family=AF_INET6;
 		printf(_("          inet6 addr: %s/%d"),
 		 inet6_aftype.sprint((struct sockaddr *) &sap, 1), plen);
 		printf(_(" Scope:"));
-		switch (scope) {
+		switch (scope & IPV6_ADDR_SCOPE_MASK) {
 		case 0:
 		    printf(_("Global"));
 		    break;
diff --git a/libbb/xgethostbyname2.c b/libbb/xgethostbyname2.c
new file mode 100644
index 000000000..c66acfee1
--- /dev/null
+++ b/libbb/xgethostbyname2.c
@@ -0,0 +1,37 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini xgethostbyname2 implementation.
+ *
+ * Copyright (C) 2001 Matt Kraai <kraai@alumni.carnegiemellon.edu>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <netdb.h>
+#include "libbb.h"
+
+
+#if CONFIG_FEATURE_IPV6
+struct hostent *xgethostbyname2(const char *name, int af)
+{
+	struct hostent *retval;
+
+	if ((retval = gethostbyname2(name, af)) == NULL)
+		herror_msg_and_die("%s", name);
+
+	return retval;
+}
+#endif