From 1e722029bc405a555e81840c00708084128c5cdd Mon Sep 17 00:00:00 2001
From: fendo <fendo@bi12info.com>
Date: Tue, 9 Apr 2013 17:03:00 +0200
Subject: [PATCH] Fix service_name management and add pppoe_only_equal_svc_name
 parameter

---
 Docs/manual.html |  5 +++++
 l2tpns.c         |  1 +
 l2tpns.h         |  1 +
 pppoe.c          | 13 ++++++++++---
 4 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/Docs/manual.html b/Docs/manual.html
index 384fe9a..95e3afe 100644
--- a/Docs/manual.html
+++ b/Docs/manual.html
@@ -466,6 +466,11 @@ PPPOE service name (default: NULL).
 PPPOE  access concentrator name (default: "l2tpns-pppoe").
 </LI>
 
+<LI><B>pppoe_only_equal_svc_name</B> (boolean)<BR>
+If set to yes, the PPPOE server only accepts clients with a "service-name"
+different from NULL and a "service-name" equal to server "service-name" (default: no).
+</LI>
+
 </UL>
 
 <P><U><B>BGP configuration</B></U></P>
diff --git a/l2tpns.c b/l2tpns.c
index 4545d6c..8f1ace5 100644
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -185,6 +185,7 @@ config_descriptt config_values[] = {
 	CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
 	CONFIG("disable_no_spoof", disable_no_spoof, BOOL),
 	CONFIG("bind_multi_address", bind_multi_address, STRING),
+	CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name, BOOL),
 	{ NULL, 0, 0, 0 }
 };
 
diff --git a/l2tpns.h b/l2tpns.h
index e962256..89f49dd 100644
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -773,6 +773,7 @@ typedef struct
 	char pppoe_service_name[64];	// pppoe service name
 	char pppoe_ac_name[64];
 	uint8_t pppoe_hwaddr[ETH_ALEN];	// MAC addr of interface pppoe to bind
+	int pppoe_only_equal_svc_name; // Accept only PADI with service-name equal to server
 	int disable_sending_hello; // Disable l2tp sending HELLO message for Apple compatibility.
 	int disable_no_spoof; // Disable no spoof (permit load balancing client --> internet)
 	int nbudpfd; // number UDP file handle
diff --git a/pppoe.c b/pppoe.c
index 01cc153..4d442cc 100644
--- a/pppoe.c
+++ b/pppoe.c
@@ -502,20 +502,27 @@ static void pppoe_recv_PADI(uint8_t *pack, int size)
 		return;
 
 	len = ntohs(hdr->length);
-	for (n = 0; n < len; n += sizeof(*tag) + ntohs(tag->tag_len)) {
+	for (n = 0; n < len; n += sizeof(*tag) + ntohs(tag->tag_len))
+	{
 		tag = (struct pppoe_tag *)(pack + ETH_HLEN + sizeof(*hdr) + n);
 		if (n + sizeof(*tag) + ntohs(tag->tag_len) > len)
 			return;
-		switch (ntohs(tag->tag_type)) {
+		switch (ntohs(tag->tag_type))
+		{
 			case TAG_END_OF_LIST:
 				break;
 			case TAG_SERVICE_NAME:
-				if (*config->pppoe_service_name && tag->tag_len)
+				if (config->pppoe_only_equal_svc_name && *config->pppoe_service_name && !tag->tag_len)
+				{
+					break;
+				}
+				else if (*config->pppoe_service_name && tag->tag_len)
 				{
 					if (ntohs(tag->tag_len) != strlen(config->pppoe_service_name))
 						break;
 					if (memcmp(tag->tag_data, config->pppoe_service_name, ntohs(tag->tag_len)))
 						break;
+					service_name_tag = tag;
 					service_match = 1;
 				}
 				else
-- 
2.20.1