From 06a6ae94e6707d78a988784fe6a8a0f5f505322f Mon Sep 17 00:00:00 2001
From: Vladislav Bolkhovitin <vst@vlnb.net>
Date: Mon, 9 Mar 2009 20:05:15 +0000
Subject: [PATCH] Heavily modified patch from Gennadiy Nerubayev
 <parakie@gmail.com>.

Adds a pattern matching for initiator names to SCST access control.



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@695 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scst/README          |  8 ++++++-
 scst/README_in-tree  |  8 ++++++-
 scst/src/scst_targ.c | 57 ++++++++++++++++++++++++++++++++++++++++----
 3 files changed, 67 insertions(+), 6 deletions(-)

diff --git a/scst/README b/scst/README
index 3b0106817..735a6f803 100644
--- a/scst/README
+++ b/scst/README
@@ -436,7 +436,10 @@ following files and directories under /proc/scsi_tgt:
     for group "GROUP"
 
   - "add NAME" to /proc/scsi_tgt/groups/GROUP/names adds name "NAME" to group
-    "GROUP"
+    "GROUP". For NAME you can use simple DOS-type patterns, containing
+    '*' and '?' symbols. '*' means match all any symbols, '?' means
+    match only any single symbol. For instance, "blah.xxx" will match
+    "bl?h.*".
 
   - "del NAME" to /proc/scsi_tgt/groups/GROUP/names deletes name "NAME" from group
     "GROUP"
@@ -454,6 +457,9 @@ Examples:
  add virtual VDISK device with name "disk1" to "Default" group
  with LUN 1.
 
+- "echo "21:*:e0:?b:83:*'" >/proc/scsi_tgt/groups/LAB1/names" will
+ add a pattern, which matches WWNs of Fibre Channel ports from LAB1.
+
 Consider you need to have an iSCSI target with name
 "iqn.2007-05.com.example:storage.disk1.sys1.xyz" (you defined it in
 iscsi-scst.conf), which should export virtual device "dev1" with LUN 0
diff --git a/scst/README_in-tree b/scst/README_in-tree
index 015b003ac..a7fceb4bc 100644
--- a/scst/README_in-tree
+++ b/scst/README_in-tree
@@ -376,7 +376,10 @@ following files and directories under /proc/scsi_tgt:
     for group "GROUP"
 
   - "add NAME" to /proc/scsi_tgt/groups/GROUP/names adds name "NAME" to group
-    "GROUP"
+    "GROUP". For NAME you can use simple DOS-type patterns, containing
+    '*' and '?' symbols. '*' means match all any symbols, '?' means
+    match only any single symbol. For instance, "blah.xxx" will match
+    "bl?h.*".
 
   - "del NAME" to /proc/scsi_tgt/groups/GROUP/names deletes name "NAME" from group
     "GROUP"
@@ -394,6 +397,9 @@ Examples:
  add virtual VDISK device with name "disk1" to "Default" group
  with LUN 1.
 
+- "echo "21:*:e0:?b:83:*'" >/proc/scsi_tgt/groups/LAB1/names" will
+ add a pattern, which matches WWNs of Fibre Channel ports from LAB1.
+
 Consider you need to have an iSCSI target with name
 "iqn.2007-05.com.example:storage.disk1.sys1.xyz" (you defined it in
 iscsi-scst.conf), which should export virtual device "dev1" with LUN 0
diff --git a/scst/src/scst_targ.c b/scst/src/scst_targ.c
index a9bd93ca4..fd5c19346 100644
--- a/scst/src/scst_targ.c
+++ b/scst/src/scst_targ.c
@@ -5094,6 +5094,57 @@ out_free:
 }
 EXPORT_SYMBOL(scst_rx_mgmt_fn);
 
+/*
+ * Returns true if string "string" matches pattern "wild", false otherwise.
+ * Pattern is a regular DOS-type pattern, containing '*' and '?' symbols.
+ * '*' means match all any symbols, '?' means match only any single symbol.
+ *
+ * For instance:
+ * if (wildcmp("bl?h.*", "blah.jpg")) {
+ *   // match
+ *  } else {
+ *   // no match
+ *  }
+ *
+ * Written by Jack Handy - jakkhandy@hotmail.com
+ * Taken by Gennadiy Nerubayev <parakie@gmail.com> from
+ * http://www.codeproject.com/KB/string/wildcmp.aspx. No license attached
+ * to it, and is posted on a free site; assumed to be free for use.
+ */
+static bool wildcmp(const char *wild, const char *string)
+{
+	const char *cp = NULL, *mp = NULL;
+
+	while ((*string) && (*wild != '*')) {
+		if ((*wild != *string) && (*wild != '?'))
+			return false;
+
+		wild++;
+		string++;
+	}
+
+	while (*string) {
+		if (*wild == '*') {
+			if (!*++wild)
+				return true;
+
+			mp = wild;
+			cp = string+1;
+		} else if ((*wild == *string) || (*wild == '?')) {
+			wild++;
+			string++;
+		} else {
+			wild = mp;
+			string = cp++;
+		}
+	}
+
+	while (*wild == '*')
+		wild++;
+
+	return !*wild;
+}
+
 /* scst_mutex supposed to be held */
 static struct scst_acg *scst_find_acg(const char *initiator_name)
 {
@@ -5103,10 +5154,8 @@ static struct scst_acg *scst_find_acg(const char *initiator_name)
 	TRACE_ENTRY();
 
 	list_for_each_entry(acg, &scst_acg_list, scst_acg_list_entry) {
-		list_for_each_entry(n, &acg->acn_list,
-			acn_list_entry)
-		{
-			if (strcmp(n->name, initiator_name) == 0) {
+		list_for_each_entry(n, &acg->acn_list, acn_list_entry) {
+			if (wildcmp(n->name, initiator_name)) {
 				TRACE_DBG("Access control group %s found",
 					acg->acg_name);
 				res = acg;