libshare: nfs: pass through ipv6 addresses in bracket notation

Recognize when the host part of a sharenfs attribute is an ipv6
Literal and pass that through without modification.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Felix Dörre <felix@dogcraft.de>
Closes: #11171
Closes #11939
Closes: #1894

lib/libshare/os/linux/nfs.c

@@ -180,8 +180,9 @@ foreach_nfs_host_cb(const char *opt, const char *value, void *pcookie)
 {
 	int error;
 	const char *access;
-	char *host_dup, *host, *next;
+	char *host_dup, *host, *next, *v6Literal;
 	nfs_host_cookie_t *udata = (nfs_host_cookie_t *)pcookie;
+	int cidr_len;
 
 #ifdef DEBUG
 	fprintf(stderr, "foreach_nfs_host_cb: key=%s, value=%s\n", opt, value);
@@ -204,11 +205,47 @@ foreach_nfs_host_cb(const char *opt, const char *value, void *pcookie)
 		host = host_dup;
 
 		do {
+			if (*host == '[') {
+				host++;
+				v6Literal = strchr(host, ']');
+				if (v6Literal == NULL) {
+					free(host_dup);
+					return (SA_SYNTAX_ERR);
+				}
+				if (v6Literal[1] == '\0') {
+					*v6Literal = '\0';
+					next = NULL;
+				} else if (v6Literal[1] == '/') {
+					next = strchr(v6Literal + 2, ':');
+					if (next == NULL) {
+						cidr_len =
+						    strlen(v6Literal + 1);
+						memmove(v6Literal,
+						    v6Literal + 1,
+						    cidr_len);
+						v6Literal[cidr_len] = '\0';
+					} else {
+						cidr_len = next - v6Literal - 1;
+						memmove(v6Literal,
+						    v6Literal + 1,
+						    cidr_len);
+						v6Literal[cidr_len] = '\0';
+						next++;
+					}
+				} else if (v6Literal[1] == ':') {
+					*v6Literal = '\0';
+					next = v6Literal + 2;
+				} else {
+					free(host_dup);
+					return (SA_SYNTAX_ERR);
+				}
+			} else {
 				next = strchr(host, ':');
 				if (next != NULL) {
 					*next = '\0';
 					next++;
 				}
+			}
 
 			error = udata->callback(udata->filename,
 			    udata->sharepath, host, udata->security,

man/man8/zfs.8

@@ -545,7 +545,7 @@ access for a set of IP addresses and to enable root access for system
 on the
 .Ar tank/home
 file system:
-.Dl # Nm zfs Cm set Sy sharenfs Ns = Ns ' Ns Ar rw Ns =@123.123.0.0/16,root= Ns Ar neo Ns ' tank/home
+.Dl # Nm zfs Cm set Sy sharenfs Ns = Ns ' Ns Ar rw Ns =@123.123.0.0/16:[::1],root= Ns Ar neo Ns ' tank/home
 .Pp
 If you are using DNS for host name resolution,
 specify the fully-qualified hostname.

tests/runfiles/linux.run

@@ -53,7 +53,7 @@ tags = ['functional', 'cli_root', 'zfs_mount']
 
 [tests/functional/cli_root/zfs_share:Linux]
 tests = ['zfs_share_005_pos', 'zfs_share_007_neg', 'zfs_share_009_neg',
-    'zfs_share_012_pos']
+    'zfs_share_012_pos', 'zfs_share_013_pos']
 tags = ['functional', 'cli_root', 'zfs_share']
 
 [tests/functional/cli_root/zfs_sysfs:Linux]

tests/zfs-tests/tests/functional/cli_root/zfs_share/Makefile.am

@@ -14,6 +14,7 @@ dist_pkgdata_SCRIPTS = \
 	zfs_share_010_neg.ksh \
 	zfs_share_011_pos.ksh \
 	zfs_share_012_pos.ksh \
+	zfs_share_013_pos.ksh \
 	zfs_share_concurrent_shares.ksh
 
 dist_pkgdata_DATA = \

tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_007_neg.ksh

@@ -51,7 +51,7 @@ function cleanup {
 
 set -A badopts \
     "r0" "r0=machine1" "r0=machine1:machine2" \
-    "-g" "-b" "-c" "-d" "--invalid" \
+    "-g" "-b" "-c" "-d" "--invalid" "rw=[::1]a:[::2]" "rw=[::1" \
     "$TESTPOOL" "$TESTPOOL/$TESTFS" "$TESTPOOL\$TESTCTR\$TESTFS1"
 
 log_assert "Verify that invalid share parameters and options are caught."

tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_013_pos.ksh

@@ -0,0 +1,80 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2020, Felix Dörre
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# Verify that NFS share options including ipv6 literals are parsed and propagated correctly.
+#
+
+verify_runnable "global"
+
+function cleanup
+{
+	log_must zfs set sharenfs=off $TESTPOOL/$TESTFS
+	is_shared $TESTPOOL/$TESTFS && \
+		log_must unshare_fs $TESTPOOL/$TESTFS
+}
+
+log_onexit cleanup
+
+cleanup
+
+log_must zfs set sharenfs="rw=[::1]" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "::1(" <<< "$output" > /dev/null
+
+log_must zfs set sharenfs="rw=[2::3]" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "2::3(" <<< "$output" > /dev/null
+
+log_must zfs set sharenfs="rw=[::1]:[2::3]" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "::1(" <<< "$output" > /dev/null
+log_must grep "2::3(" <<< "$output" > /dev/null
+
+log_must zfs set sharenfs="rw=[::1]/64" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "::1/64(" <<< "$output" > /dev/null
+
+log_must zfs set sharenfs="rw=[2::3]/128" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "2::3/128(" <<< "$output" > /dev/null
+
+log_must zfs set sharenfs="rw=[::1]/32:[2::3]/128" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "::1/32(" <<< "$output" > /dev/null
+log_must grep "2::3/128(" <<< "$output" > /dev/null
+
+log_must zfs set sharenfs="rw=[::1]:[2::3]/64:[2a01:1234:1234:1234:aa34:234:1234:1234]:1.2.3.4/24" $TESTPOOL/$TESTFS
+output=$(showshares_nfs 2>&1)
+log_must grep "::1(" <<< "$output" > /dev/null
+log_must grep "2::3/64(" <<< "$output" > /dev/null
+log_must grep "2a01:1234:1234:1234:aa34:234:1234:1234(" <<< "$output" > /dev/null
+log_must grep "1\\.2\\.3\\.4/24(" <<< "$output" > /dev/null
+
+log_pass "NFS share ip address propagated correctly."