Add 'netserver' command to EFI loader.

In some environments is difficult to access bootp/dhcp
configuration as "standard user". Add a command that allows to set
or display the URI of the network server used as "net:" device.
Currently only tftp and nfs protocols are supported.

Typical usage pattern is:
netserver tftp://192.168.168.1/path_to_obj_dir/arm.armv7/sys/GENERIC/
boot net:kernel

Reviewed by:	imp, kevans
MFC after:	4 weeks
Differential Revision: https://reviews.freebsd.org/D26736

1 files changed, 35 insertions, 0 deletions

diff --git a/stand/efi/loader/main.c b/stand/efi/loader/main.c
index d0d09ebd6a75..ad81b784cb66 100644
--- a/stand/efi/loader/main.c
+++ b/stand/efi/loader/main.c
@@ -40,10 +40,14 @@ __FBSDID("$FreeBSD$");
 #include <sys/zfs_bootenv.h>
 #endif
 #include <paths.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
 #include <stdint.h>
 #include <string.h>
 #include <setjmp.h>
 #include <disk.h>
+#include <dev_net.h>
+#include <net.h>
 
 #include <efi.h>
 #include <efilib.h>
@@ -1594,3 +1598,34 @@ command_chain(int argc, char *argv[])
 }
 
 COMMAND_SET(chain, "chain", "chain load file", command_chain);
+
+extern struct in_addr servip;
+static int
+command_netserver(int argc, char *argv[])
+{
+	char *proto;
+	n_long rootaddr;
+
+	if (argc > 2) {
+		command_errmsg = "wrong number of arguments";
+		return (CMD_ERROR);
+	}
+	if (argc < 2) {
+		proto = netproto == NET_TFTP ? "tftp://" : "nfs://";
+		printf("Netserver URI: %s%s%s\n", proto, intoa(rootip.s_addr),
+		    rootpath);
+		return (CMD_OK);
+	}
+	if (argc == 2) {
+		strncpy(rootpath, argv[1], sizeof(rootpath));
+		rootpath[sizeof(rootpath) -1] = '\0';
+		if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
+			servip.s_addr = rootip.s_addr = rootaddr;
+		return (CMD_OK);
+	}
+	return (CMD_ERROR);	/* not reached */
+
+}
+
+COMMAND_SET(netserver, "netserver", "change or display netserver URI",
+    command_netserver);