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authorDerrell Lipman <derrell@samba.org>2006-10-11 00:33:48 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 12:15:23 -0500
commit2db5ed7fa5b07ce28daf44d56bf07c131af90d02 (patch)
tree65e38c0f144f01704cab0bccc72c07e64055040d /source3/client/smbumount.c
parentee0ec181012067b6115ba2654ac7a5a2658bd87a (diff)
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r19231: I encountered a WinXP/Home system which, acting as the master browser for its
workgroup, decided periodically to stop sending recognized responses to a NetServerEnum2 request for the workgroup. Instead of returning the list of servers (only itself; nothing else in the workgroup), it returns a status code of 8 which is unsupported by samba3, samba4, and ethereal. The code for this request assumed that if an unexpected status code was received, the connection had a problem, i.e. that cli_errno() would show a problem. That turns out not to be the case. This patch changes the behavior so tha any time a response is received and cli_errno() == 0, we continue processing the reply and base our response on the returned count (zero). The pre-existing code then converts this count=0 into an ENOENT errno which can be properly handled by the application (whereas an error return with errno=0 can't be). This packet dump has only 2 frames. Sorry about the text version but it's most easily attached to this log message. I also have it saved as .pcap if anyone wants it. Derrell No. Time Source Destination Protocol Info 1 14:31:59.802668 192.168.1.106 192.168.1.100 LANMAN NetServerEnum2 Request, Server, SQL Server, Domain Controller, Backup Controller, Time Source, Apple Server, Novell Server, Domain Member Server, Print Queue Server, Dialin Server, Xenix Server, NT Workstation, Windows for Workgroups, Unknown server type:14, NT Server Frame 1 (196 bytes on wire, 196 bytes captured) Arrival Time: Oct 10, 2006 14:31:59.802668000 Time delta from previous packet: 0.000000000 seconds Time since reference or first frame: 0.000000000 seconds Frame Number: 1 Packet Length: 196 bytes Capture Length: 196 bytes Protocols in frame: eth:ip:tcp:nbss:smb Ethernet II, Src: IntelCor_4a:47:bb (00:13:20:4a:47:bb), Dst: Micro-St_74:16:e7 (00:0c:76:74:16:e7) Destination: Micro-St_74:16:e7 (00:0c:76:74:16:e7) Source: IntelCor_4a:47:bb (00:13:20:4a:47:bb) Type: IP (0x0800) Internet Protocol, Src: 192.168.1.106 (192.168.1.106), Dst: 192.168.1.100 (192.168.1.100) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 182 Identification: 0xb838 (47160) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 64 Protocol: TCP (0x06) Header checksum: 0xfdea [correct] Good: True Bad : False Source: 192.168.1.106 (192.168.1.106) Destination: 192.168.1.100 (192.168.1.100) Transmission Control Protocol, Src Port: 44932 (44932), Dst Port: netbios-ssn (139), Seq: 851982066, Ack: 1274726157, Len: 130 Source port: 44932 (44932) Destination port: netbios-ssn (139) Sequence number: 851982066 Next sequence number: 851982196 Acknowledgement number: 1274726157 Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 6432 Checksum: 0xb4e0 [correct] Options: (12 bytes) NOP NOP Time stamp: tsval 1184074739, tsecr 11576161 NetBIOS Session Service Message Type: Session message Flags: 0x00 .... ...0 = Add 0 to length Length: 126 SMB (Server Message Block Protocol) SMB Header Server Component: SMB Response in: 2 SMB Command: Trans (0x25) NT Status: STATUS_SUCCESS (0x00000000) Flags: 0x08 0... .... = Request/Response: Message is a request to the server .0.. .... = Notify: Notify client only on open ..0. .... = Oplocks: OpLock not requested/granted ...0 .... = Canonicalized Pathnames: Pathnames are not canonicalized .... 1... = Case Sensitivity: Path names are caseless .... ..0. = Receive Buffer Posted: Receive buffer has not been posted .... ...0 = Lock and Read: Lock&Read, Write&Unlock are not supported Flags2: 0xc801 1... .... .... .... = Unicode Strings: Strings are Unicode .1.. .... .... .... = Error Code Type: Error codes are NT error codes ..0. .... .... .... = Execute-only Reads: Don't permit reads if execute-only ...0 .... .... .... = Dfs: Don't resolve pathnames with Dfs .... 1... .... .... = Extended Security Negotiation: Extended security negotiation is supported .... .... .0.. .... = Long Names Used: Path names in request are not long file names .... .... .... .0.. = Security Signatures: Security signatures are not supported .... .... .... ..0. = Extended Attributes: Extended attributes are not supported .... .... .... ...1 = Long Names Allowed: Long file names are allowed in the response Process ID High: 0 Signature: 0000000000000000 Reserved: 0000 Tree ID: 2048 Process ID: 12967 User ID: 2048 Multiplex ID: 6 Trans Request (0x25) Word Count (WCT): 14 Total Parameter Count: 36 Total Data Count: 0 Max Parameter Count: 8 Max Data Count: 65535 Max Setup Count: 0 Reserved: 00 Flags: 0x0000 .... .... .... ..0. = One Way Transaction: Two way transaction .... .... .... ...0 = Disconnect TID: Do NOT disconnect TID Timeout: Return immediately (0) Reserved: 0000 Parameter Count: 36 Parameter Offset: 90 Data Count: 0 Data Offset: 126 Setup Count: 0 Reserved: 00 Byte Count (BCC): 63 Transaction Name: \PIPE\LANMAN SMB Pipe Protocol Microsoft Windows Lanman Remote API Protocol Function Code: NetServerEnum2 (104) Parameter Descriptor: WrLehDz Return Descriptor: B16BBDz Detail Level: 1 Receive Buffer Length: 65535 Server Type: 0x0000fffe .... .... .... .... .... .... .... ...0 = Workstation: This is NOT a Workstation .... .... .... .... .... .... .... ..1. = Server: This is a Server .... .... .... .... .... .... .... .1.. = SQL: This is an SQL server .... .... .... .... .... .... .... 1... = Domain Controller: This is a Domain Controller .... .... .... .... .... .... ...1 .... = Backup Controller: This is a Backup Controller .... .... .... .... .... .... ..1. .... = Time Source: This is a Time Source .... .... .... .... .... .... .1.. .... = Apple: This is an Apple host .... .... .... .... .... .... 1... .... = Novell: This is a Novell server .... .... .... .... .... ...1 .... .... = Member: This is a Domain Member server .... .... .... .... .... ..1. .... .... = Print: This is a Print Queue server .... .... .... .... .... .1.. .... .... = Dialin: This is a Dialin server .... .... .... .... .... 1... .... .... = Xenix: This is a Xenix server .... .... .... .... ...1 .... .... .... = NT Workstation: This is an NT Workstation .... .... .... .... ..1. .... .... .... = WfW: This is a WfW host .... .... .... .... 1... .... .... .... = NT Server: This is an NT Server .... .... .... ...0 .... .... .... .... = Potential Browser: This is NOT a Potential Browser .... .... .... ..0. .... .... .... .... = Backup Browser: This is NOT a Backup Browser .... .... .... .0.. .... .... .... .... = Master Browser: This is NOT a Master Browser .... .... .... 0... .... .... .... .... = Domain Master Browser: This is NOT a Domain Master Browser .... .... ...0 .... .... .... .... .... = OSF: This is NOT an OSF host .... .... ..0. .... .... .... .... .... = VMS: This is NOT a VMS host .... .... .0.. .... .... .... .... .... = Windows 95+: This is NOT a Windows 95 or above host .0.. .... .... .... .... .... .... .... = Local: This is NOT a local list only request 0... .... .... .... .... .... .... .... = Domain Enum: This is NOT a Domain Enum request Enumeration Domain: WORKGROUP No. Time Source Destination Protocol Info 2 14:31:59.803918 192.168.1.100 192.168.1.106 LANMAN NetServerEnum2 Response Frame 2 (134 bytes on wire, 134 bytes captured) Arrival Time: Oct 10, 2006 14:31:59.803918000 Time delta from previous packet: 0.001250000 seconds Time since reference or first frame: 0.001250000 seconds Frame Number: 2 Packet Length: 134 bytes Capture Length: 134 bytes Protocols in frame: eth:ip:tcp:nbss:smb Ethernet II, Src: Micro-St_74:16:e7 (00:0c:76:74:16:e7), Dst: IntelCor_4a:47:bb (00:13:20:4a:47:bb) Destination: IntelCor_4a:47:bb (00:13:20:4a:47:bb) Source: Micro-St_74:16:e7 (00:0c:76:74:16:e7) Type: IP (0x0800) Internet Protocol, Src: 192.168.1.100 (192.168.1.100), Dst: 192.168.1.106 (192.168.1.106) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 120 Identification: 0xea10 (59920) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0x8c50 [correct] Good: True Bad : False Source: 192.168.1.100 (192.168.1.100) Destination: 192.168.1.106 (192.168.1.106) Transmission Control Protocol, Src Port: netbios-ssn (139), Dst Port: 44932 (44932), Seq: 1274726157, Ack: 851982196, Len: 68 Source port: netbios-ssn (139) Destination port: 44932 (44932) Sequence number: 1274726157 Next sequence number: 1274726225 Acknowledgement number: 851982196 Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 64606 Checksum: 0x1e0d [correct] Options: (12 bytes) NOP NOP Time stamp: tsval 11576161, tsecr 1184074739 NetBIOS Session Service Message Type: Session message Flags: 0x00 .... ...0 = Add 0 to length Length: 64 SMB (Server Message Block Protocol) SMB Header Server Component: SMB Response to: 1 Time from request: 0.001250000 seconds SMB Command: Trans (0x25) NT Status: STATUS_SUCCESS (0x00000000) Flags: 0x88 1... .... = Request/Response: Message is a response to the client/redirector .0.. .... = Notify: Notify client only on open ..0. .... = Oplocks: OpLock not requested/granted ...0 .... = Canonicalized Pathnames: Pathnames are not canonicalized .... 1... = Case Sensitivity: Path names are caseless .... ..0. = Receive Buffer Posted: Receive buffer has not been posted .... ...0 = Lock and Read: Lock&Read, Write&Unlock are not supported Flags2: 0xc801 1... .... .... .... = Unicode Strings: Strings are Unicode .1.. .... .... .... = Error Code Type: Error codes are NT error codes ..0. .... .... .... = Execute-only Reads: Don't permit reads if execute-only ...0 .... .... .... = Dfs: Don't resolve pathnames with Dfs .... 1... .... .... = Extended Security Negotiation: Extended security negotiation is supported .... .... .0.. .... = Long Names Used: Path names in request are not long file names .... .... .... .0.. = Security Signatures: Security signatures are not supported .... .... .... ..0. = Extended Attributes: Extended attributes are not supported .... .... .... ...1 = Long Names Allowed: Long file names are allowed in the response Process ID High: 0 Signature: 0000000000000000 Reserved: 0000 Tree ID: 2048 Process ID: 12967 User ID: 2048 Multiplex ID: 6 Trans Response (0x25) Word Count (WCT): 10 Total Parameter Count: 8 Total Data Count: 0 Reserved: 0000 Parameter Count: 8 Parameter Offset: 56 Parameter Displacement: 0 Data Count: 0 Data Offset: 64 Data Displacement: 0 Setup Count: 0 Reserved: 00 Byte Count (BCC): 9 Padding: 00 SMB Pipe Protocol Microsoft Windows Lanman Remote API Protocol Function Code: NetServerEnum2 (104) Status: Unknown (8) Convert: 0 Entry Count: 0 Available Entries: 0 (This used to be commit 88fa5ac7347cbae92abe17da8d3af00e85110c43)
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