Add ifconfig command as RTEMS Shell command

This is enough to be able to invoke the ifconfig command but it
calls exit() which is inappropriate.

The "struct option" in the ifconfig code conflicts with a structure
of the same name in newlib's and glibc's getopt.h.

freebsd-userspace/commands/sbin/ifconfig/af_inet6.c

@@ -540,7 +540,11 @@ in6_Lopt_cb(const char *optarg __unused)
 {
 	ip6lifetime++;	/* print IPv6 address lifetime */
 }
+#ifdef __rtems__
+static struct ifconfig_option in6_Lopt = { .opt = "L", .opt_usage = "[-L]", .cb = in6_Lopt_cb };
+#else
 static struct option in6_Lopt = { .opt = "L", .opt_usage = "[-L]", .cb = in6_Lopt_cb };
+#endif
 
 static __constructor void
 inet6_ctor(void)

freebsd-userspace/commands/sbin/ifconfig/ifclone.c

@@ -183,7 +183,11 @@ clone_Copt_cb(const char *optarg __unused)
 	list_cloners();
 	exit(0);
 }
+#ifdef __rtems__
+static struct ifconfig_option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
+#else
 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
+#endif
 
 static __constructor void
 clone_ctor(void)

freebsd-userspace/commands/sbin/ifconfig/ifconfig.c

@@ -1,3 +1,7 @@
+#ifdef __rtems__
+#define __need_getopt_newlib
+#include <getopt.h>
+#endif
 /*
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -123,6 +127,16 @@ static struct afswtch *af_getbyname(const char *name);
 static struct afswtch *af_getbyfamily(int af);
 static void af_other_status(int);
 
+#ifdef __rtems__
+static struct ifconfig_option *opts = NULL;
+
+void
+opt_register(struct ifconfig_option *p)
+{
+	p->next = opts;
+	opts = p;
+}
+#else
 static struct option *opts = NULL;
 
 void
@@ -131,12 +145,17 @@ opt_register(struct option *p)
 	p->next = opts;
 	opts = p;
 }
+#endif
 
 static void
 usage(void)
 {
 	char options[1024];
+	#ifdef __rtems__
+	struct ifconfig_option *p;
+	#else
 	struct option *p;
+	#endif
 
 	/* XXX not right but close enough for now */
 	options[0] = '\0';
@@ -172,8 +191,15 @@ main(int argc, char *argv[])
 	const struct sockaddr_dl *sdl;
 	char options[1024], *cp;
 	const char *ifname;
+#ifdef __rtems__
+	struct ifconfig_option *p;
+#else
 	struct option *p;
+#endif
 	size_t iflen;
+#ifdef __rtems__
+	struct getopt_data getopt_reent;
+#endif
 
 	all = downonly = uponly = namesonly = noload = verbose = 0;
 
@@ -181,7 +207,12 @@ main(int argc, char *argv[])
 	strlcpy(options, "adklmnuv", sizeof(options));
 	for (p = opts; p != NULL; p = p->next)
 		strlcat(options, p->opt, sizeof(options));
+#ifdef __rtems__
+	memset(&getopt_reent, 0, sizeof(getopt_data));
+	while ((c = getopt_r(argc, argv, options, &getopt_reent)) != -1) {
+#else
 	while ((c = getopt(argc, argv, options)) != -1) {
+#endif
 		switch (c) {
 		case 'a':	/* scan all interfaces */
 			all++;
@@ -672,8 +703,8 @@ setifvnet(const char *jname, int dummy __unused, int s,
 	struct ifreq my_ifr;
 
 	memcpy(&my_ifr, &ifr, sizeof(my_ifr));
-	my_ifr.ifr_jid = jail_getid(jname);
 #ifndef __rtems__
+	my_ifr.ifr_jid = jail_getid(jname);
 	if (my_ifr.ifr_jid < 0)
 		errx(1, "%s", jail_errmsg);
 #endif
@@ -688,8 +719,8 @@ setifrvnet(const char *jname, int dummy __unused, int s,
 	struct ifreq my_ifr;
 
 	memcpy(&my_ifr, &ifr, sizeof(my_ifr));
-	my_ifr.ifr_jid = jail_getid(jname);
 #ifndef __rtems__
+	my_ifr.ifr_jid = jail_getid(jname);
 	if (my_ifr.ifr_jid < 0)
 		errx(1, "%s", jail_errmsg);
 #endif
@@ -1061,6 +1092,7 @@ printb(const char *s, unsigned v, const char *bits)
 void
 ifmaybeload(const char *name)
 {
+#ifndef __rtems__
 #define MOD_PREFIX_LEN		3	/* "if_" */
 	struct module_stat mstat;
 	int fileid, modid;
@@ -1107,6 +1139,7 @@ ifmaybeload(const char *name)
 
 	/* not present, we should try to load it */
 	kldload(ifkind);
+#endif
 }
 
 static struct cmd basic_cmds[] = {
@@ -1188,3 +1221,16 @@ ifconfig_ctor(void)
 		cmd_register(&basic_cmds[i]);
 #undef N
 }
+
+#ifdef __rtems__
+  #include <rtems/shell.h>
+
+  rtems_shell_cmd_t rtems_shell_IFCONFIG_Command = {
+    "ifconfig",                    /* name */
+    "ifconfig [args]",             /* usage */
+    "net",                         /* topic */
+    main_ifconfig,                 /* command */
+    NULL,                          /* alias */
+    NULL                           /* next */
+  };
+#endif

freebsd-userspace/commands/sbin/ifconfig/ifconfig.h

@@ -121,13 +121,25 @@ struct afswtch {
 };
 void	af_register(struct afswtch *);
 
+#ifdef __rtems__
+struct ifconfig_option {
+#else
 struct option {
+#endif
 	const char *opt;
 	const char *opt_usage;
 	void	(*cb)(const char *arg);
+	#ifdef __rtems__
+	struct ifconfig_option *next;
+	#else
 	struct option *next;
+	#endif
 };
+#ifdef __rtems__
+void	opt_register(struct ifconfig_option *);
+#else
 void	opt_register(struct option *);
+#endif
 
 extern	struct ifreq ifr;
 extern	char name[IFNAMSIZ];	/* name of interface */

freebsd-userspace/commands/sbin/ifconfig/ifgroup.c

@@ -170,7 +170,11 @@ static struct afswtch af_group = {
 	.af_af		= AF_UNSPEC,
 	.af_other_status = getifgroups,
 };
+#ifdef __rtems__
+static struct ifconfig_option group_gopt = { "g:", "[-g groupname]", printgroup };
+#else
 static struct option group_gopt = { "g:", "[-g groupname]", printgroup };
+#endif
 
 static __constructor void
 group_ctor(void)