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diff --git a/356/index.md b/356/index.md new file mode 100644 index 0000000..f861a29 --- /dev/null +++ b/356/index.md @@ -0,0 +1,180 @@ +Title: Dillo fails to connect to PHP internal http webserver / PHP webserver instantly resets TCP connection +Author: ghost +Created: Sat, 15 Feb 2025 14:11:55 +0000 +State: closed + +**1. Start PHP internal webserver by running:** + +`php -S localhost:80 -t /path/to/html-directory/` + +(you can choos to use an port above 1024 if you do not have enough privileges) + +**2. Try to connect to the URL (http://localhost:80, for example)** + + - Dillo displays error message: "Could not establish connection" + + +**4. Looking at Wireshark log the following TCP package sequence can be seen** + +Dillo Requests connection +PHP resets connection +Dillo Requests connection +PHP resets conntection + + +**Packet capture details of the first 2 packets** + +Dillo request: + +``` +Transmission Control Protocol, Src Port: 43556, Dst Port: 80, Seq: 0, Len: 0 + Source Port: 43556 + Destination Port: 80 + [Stream index: 0] + [Conversation completeness: Incomplete (37)] + [TCP Segment Len: 0] + Sequence Number: 0 (relative sequence number) + Sequence Number (raw): 211095531 + [Next Sequence Number: 1 (relative sequence number)] + Acknowledgment Number: 0 + Acknowledgment number (raw): 0 + 1010 .... = Header Length: 40 bytes (10) + Flags: 0x002 (SYN) + 000. .... .... = Reserved: Not set + ...0 .... .... = Accurate ECN: Not set + .... 0... .... = Congestion Window Reduced: Not set + .... .0.. .... = ECN-Echo: Not set + .... ..0. .... = Urgent: Not set + .... ...0 .... = Acknowledgment: Not set + .... .... 0... = Push: Not set + .... .... .0.. = Reset: Not set + .... .... ..1. = Syn: Set + [Expert Info (Chat/Sequence): Connection establish request (SYN): server port 80] + [Connection establish request (SYN): server port 80] + [Severity level: Chat] + [Group: Sequence] + .... .... ...0 = Fin: Not set + [TCP Flags: ··········S·] + Window: 65495 + [Calculated window size: 65495] + Checksum: 0xf5ad [unverified] + [Checksum Status: Unverified] + Urgent Pointer: 0 + Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale + TCP Option - Maximum segment size: 65495 bytes + Kind: Maximum Segment Size (2) + Length: 4 + MSS Value: 65495 + TCP Option - SACK permitted + Kind: SACK Permitted (4) + Length: 2 + TCP Option - Timestamps: TSval 423197222, TSecr 0 + Kind: Time Stamp Option (8) + Length: 10 + Timestamp value: 423197222 + Timestamp echo reply: 0 + TCP Option - No-Operation (NOP) + Kind: No-Operation (1) + TCP Option - Window scale: 7 (multiply by 128) + Kind: Window Scale (3) + Length: 3 + Shift count: 7 + [Multiplier: 128] + [Timestamps] + [Time since first frame in this TCP stream: 0.000000000 seconds] + [Time since previous frame in this TCP stream: 0.000000000 seconds] +``` + + +PHP response: +``` + +Transmission Control Protocol, Src Port: 80, Dst Port: 43556, Seq: 1, Ack: 1, Len: 0 + Source Port: 80 + Destination Port: 43556 + [Stream index: 0] + [Conversation completeness: Incomplete (37)] + [TCP Segment Len: 0] + Sequence Number: 1 (relative sequence number) + Sequence Number (raw): 0 + [Next Sequence Number: 1 (relative sequence number)] + Acknowledgment Number: 1 (relative ack number) + Acknowledgment number (raw): 211095532 + 0101 .... = Header Length: 20 bytes (5) + Flags: 0x014 (RST, ACK) + 000. .... .... = Reserved: Not set + ...0 .... .... = Accurate ECN: Not set + .... 0... .... = Congestion Window Reduced: Not set + .... .0.. .... = ECN-Echo: Not set + .... ..0. .... = Urgent: Not set + .... ...1 .... = Acknowledgment: Set + .... .... 0... = Push: Not set + .... .... .1.. = Reset: Set + [Expert Info (Warning/Sequence): Connection reset (RST)] + [Connection reset (RST)] + [Severity level: Warning] + [Group: Sequence] + .... .... ..0. = Syn: Not set + .... .... ...0 = Fin: Not set + [TCP Flags: ·······A·R··] + Window: 0 + [Calculated window size: 0] + [Window size scaling factor: -1 (unknown)] + Checksum: 0xead8 [unverified] + [Checksum Status: Unverified] + Urgent Pointer: 0 + [Timestamps] + [Time since first frame in this TCP stream: 0.000044930 seconds] + [Time since previous frame in this TCP stream: 0.000044930 seconds] + [SEQ/ACK analysis] + [This is an ACK to the segment in frame: 438] + [The RTT to ACK the segment was: 0.000044930 seconds] + [iRTT: 0.000044930 seconds] +``` + + + + +--%-- +From: rodarima +Date: Sat, 15 Feb 2025 14:37:45 +0000 + +What does “curl -v http://localhost” says? + + +--%-- +From: ghost +Date: Sat, 15 Feb 2025 15:00:09 +0000 + +Interesting, seems to be IP version related, haven't thought about that. + +curl -v http://localhost:12888/index.html +* Trying 127.0.0.1:12888... +* connect to 127.0.0.1 port 12888 failed: Connection rejected +* Trying [::1]:12888... +* Connected to localhost (::1) port 12888 (#0) +> GET /index.html HTTP/1.1 +> Host: localhost:12888 +> User-Agent: curl/7.88.1 +> Accept: */* +> +< HTTP/1.1 200 OK +< Host: localhost:12888 +< Date: Sat, 15 Feb 2025 14:57:44 GMT +< Connection: close +< Content-Type: text/html; charset=UTF-8 +< Content-Length: 49935 + + + +--%-- +From: rodarima +Date: Sat, 15 Feb 2025 15:08:38 +0000 + +Try building dillo with --enable-ipv6, it looks you are listening on IPv6 only. + +--%-- +From: ghost +Date: Sat, 15 Feb 2025 15:15:48 +0000 + +Yeah, that was an example of RTFM and works fine now 🙈👍
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