[stgt] [PATCH 4/5] Call user defined callback progam from target_redirected()

[Chandra Seetharaman]

Implement the calling of user defined callback.

Basically, the callback is called from target_redirected() to get 
redirect address, redirect port and redirect reason in 
"string_addr:string_port:string_reason" syntax.

Signed-Off-By: Chandra Seetharaman <sekharan at us.ibm.com>
---
 usr/iscsi/target.c |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

Index: tgt-1.0.8/usr/iscsi/target.c
===================================================================
--- tgt-1.0.8.orig/usr/iscsi/target.c
+++ tgt-1.0.8/usr/iscsi/target.c
@@ -197,7 +197,38 @@ int target_redirected(struct iscsi_targe
 	socklen_t len;
 	int ret, rsn;
 	char *p, *q, *str, *port, *addr;
+	char buffer[NI_MAXHOST + NI_MAXSERV + 4];
 
+	if (target->redirect_info.callback) {
+		bzero(buffer, NI_MAXHOST + NI_MAXSERV + 4);
+		ret = call_program(target->redirect_info.callback,
+			NULL, NULL, buffer, NI_MAXHOST + NI_MAXSERV + 4, 0);
+		if (ret)
+			goto predefined;
+
+		/* syntax is string_addr:string_port:string_reason */
+		addr = p = buffer;
+		while (*p != ':' && *p != '\0')
+			p++;
+		if (!*p)
+			goto predefined;
+		*p = '\0';
+		port = ++p;
+		while (*p != ':' && *p != '\0')
+			p++;
+		if (!*p)
+			goto predefined;
+		*p = '\0';
+		p++;
+		if (!strncmp(p, "Temporary", 9))
+			rsn = ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP;
+		else if (!strncmp(p, "Permanent", 9))
+			rsn = ISCSI_LOGIN_STATUS_TGT_MOVED_PERM;
+		else
+			goto predefined;
+		goto process;
+	}
+predefined:
 	if (!strlen(target->redirect_info.addr))
 		return 0;
 
@@ -205,6 +236,7 @@ int target_redirected(struct iscsi_targe
 	port = target->redirect_info.port;
 	rsn = target->redirect_info.reason;
 
+process:
 	if (rsn != ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP &&
 	    rsn != ISCSI_LOGIN_STATUS_TGT_MOVED_PERM)
 		return 0;
--
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