ppp: don't die on malformed PADS frames that might appear on instable DSL lines

SVN-Revision: 25044

1 files changed, 109 insertions, 0 deletions

diff --git a/package/ppp/patches/350-survive_bad_pads_packets.patch b/package/ppp/patches/350-survive_bad_pads_packets.patch
new file mode 100644
index 0000000..66c656d
--- /dev/null
+++ b/package/ppp/patches/350-survive_bad_pads_packets.patch
@@ -0,0 +1,109 @@
+--- a/pppd/plugins/rp-pppoe/common.c
++++ b/pppd/plugins/rp-pppoe/common.c
+@@ -75,7 +75,9 @@ parsePacket(PPPoEPacket *packet, ParseFu
+ 	    error("Invalid PPPoE tag length (%u)", tagLen);
+ 	    return -1;
+ 	}
+-	func(tagType, tagLen, curTag+TAG_HDR_SIZE, extra);
++	if (func(tagType, tagLen, curTag+TAG_HDR_SIZE, extra)) {
++		return -1;
++	}
+ 	curTag = curTag + TAG_HDR_SIZE + tagLen;
+     }
+     return 0;
+--- a/pppd/plugins/rp-pppoe/discovery.c
++++ b/pppd/plugins/rp-pppoe/discovery.c
+@@ -48,7 +48,7 @@ static char const RCSID[] =
+ *%DESCRIPTION:
+ * If a HostUnique tag is found which matches our PID, sets *extra to 1.
+ ***********************************************************************/
+-void
++int
+ parseForHostUniq(UINT16_t type, UINT16_t len, unsigned char *data,
+ 		 void *extra)
+ {
+@@ -60,6 +60,7 @@ parseForHostUniq(UINT16_t type, UINT16_t
+ 	    *val = 1;
+ 	}
+     }
++    return 0;
+ }
+ 
+ /**********************************************************************
+@@ -102,7 +103,7 @@ packetIsForMe(PPPoEConnection *conn, PPP
+ *%DESCRIPTION:
+ * Picks interesting tags out of a PADO packet
+ ***********************************************************************/
+-void
++int
+ parsePADOTags(UINT16_t type, UINT16_t len, unsigned char *data,
+ 	      void *extra)
+ {
+@@ -181,6 +182,7 @@ parsePADOTags(UINT16_t type, UINT16_t le
+ 	}
+ 	break;
+     }
++    return 0;
+ }
+ 
+ /**********************************************************************
+@@ -195,7 +197,7 @@ parsePADOTags(UINT16_t type, UINT16_t le
+ *%DESCRIPTION:
+ * Picks interesting tags out of a PADS packet
+ ***********************************************************************/
+-void
++int
+ parsePADSTags(UINT16_t type, UINT16_t len, unsigned char *data,
+ 	      void *extra)
+ {
+@@ -205,17 +207,21 @@ parsePADSTags(UINT16_t type, UINT16_t le
+ 	dbglog("PADS: Service-Name: '%.*s'", (int) len, data);
+ 	break;
+     case TAG_SERVICE_NAME_ERROR:
+-	fatal("PADS: Service-Name-Error: %.*s", (int) len, data);
++	error("PADS: Service-Name-Error: %.*s", (int) len, data);
++	return -1;
+     case TAG_AC_SYSTEM_ERROR:
+-	fatal("PADS: System-Error: %.*s", (int) len, data);
++	error("PADS: System-Error: %.*s", (int) len, data);
++	return -1;
+     case TAG_GENERIC_ERROR:
+-	fatal("PADS: Generic-Error: %.*s", (int) len, data);
++	error("PADS: Generic-Error: %.*s", (int) len, data);
++	return -1;
+     case TAG_RELAY_SESSION_ID:
+ 	conn->relayId.type = htons(type);
+ 	conn->relayId.length = htons(len);
+ 	memcpy(conn->relayId.payload, data, len);
+ 	break;
+     }
++    return 0;
+ }
+ 
+ /***********************************************************************
+@@ -532,9 +538,11 @@ waitForPADS(PPPoEConnection *conn, int t
+ 	/* Is it PADS?  */
+ 	if (packet.code == CODE_PADS) {
+ 	    /* Parse for goodies */
+-	    parsePacket(&packet, parsePADSTags, conn);
+-	    conn->discoveryState = STATE_SESSION;
+-	    break;
++	    if (!parsePacket(&packet, parsePADSTags, conn))
++	    {
++		conn->discoveryState = STATE_SESSION;
++		break;
++	    }
+ 	}
+     } while (conn->discoveryState != STATE_SESSION);
+ 
+--- a/pppd/plugins/rp-pppoe/pppoe.h
++++ b/pppd/plugins/rp-pppoe/pppoe.h
+@@ -238,7 +238,7 @@ typedef struct PPPoETagStruct {
+ #define READ_CHUNK 4096
+ 
+ /* Function passed to parsePacket */
+-typedef void ParseFunc(UINT16_t type,
++typedef int ParseFunc(UINT16_t type,
+ 		       UINT16_t len,
+ 		       unsigned char *data,
+ 		       void *extra);