View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0001252 | unreal | ircd | public | 2003-09-17 14:32 | 2004-07-22 17:20 |
| Reporter | kormat | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | open | ||
| Product Version | 3.2-beta17 | ||||
| Summary | 0001252: IPv6 todo: improve dns lookup method ip4/ip6 | ||||
| Description | A) Connecting via localhost to the server causes the ircd to report the users hosts as localhost.domain.tld. B) Connecting via external ip causes the connection to hang for exactly 30 seconds. | ||||
| Steps To Reproduce | A: 1. Connect with irc client to localhost:6667 2. Do /who username. 3. See that host is localhost.domain.tld B: 1. Connect with irc client to ipaddree:6667 2. Connection hangs for 30 seconds 3. Then 'Welcome' line appears and all works fine from there 4. /who reports the ip address, not the machine name | ||||
| Additional Information | DNS is definetely working correctly. I've done an strace on the ircd as i connect, and i can see it get the correct details from the dns server. I'm using ssl. IPv6 is also enabled, but not being used. | ||||
| Attached Files | debug.log (4,708 bytes) | ||||
| 3rd party modules | |||||
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Well it works fine here and at thousands of other systems (not that there can't be any bug)... I've seen A before, so I can confirm that behavior sometimes (never had it here, but..). Now for B... 1. what's your /etc/resolv.conf nameserver? is it 127.0.0.1 or are you using an external nameserver? 2. verify dns by doing 'host <yourip>' and then 'host <the-hostname-the-previous-query-returned>', like: # host 192.168.5.220 Name: vulnscan.testnet Address: 192.168.5.220 # host vulnscan.testnet vulnscan.testnet A 192.168.5.220 Please post both results back to me. If you got enough time and are sure that isn't the problem then you can also go directly to the next step: - compile with debugmode (define it in include/config.h) - boot the ircd with: src/ircd -x 100 - connect like step B, wait till you get in, and quit immediately - kill your ircd (kill -15 `cat ircd.pid`) - send the debug.log that was created to me at [email protected] or attach it here. On a sidenote, did you try without SSL+IPv6? FYI, I personally use a SSL+IPv6 compiled UnrealIRCd (ipv6 not used) at debian too (woody&sid). Have fun. |
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1. My /etc/resolv.conf nameserver is an external namesrever, same as in the set::dns::nameserver option in the .conf file. 2. Yup, that all works perfectly Will recompile and send on the logs. Tried without ssl, same results, except with one very strange exception. I added a non-ssl port on 6668. I can connect to it as 127.0.0.1:6668, but not as localhost:6668. The connection gets closed immediately with the latter. |
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Right, there's the debug.log following your instructions. Hope that helps. |
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Ah.... I compiled it again without ipv6 support, and the delay goes away. From a look through the debug.log, it looks like it was trying to do a reverse lookup on the ipv6 address of the client and failing. At least, that's my guess. edited on: 09-17-03 17:23 |
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well... it's confused because you use 'nonado.net' for that specific ip (ie, the domain, not blabla.domain.something)... it sends a request for ANY record of 'nonado.net' and only gets 4 nameservers back, not any A record. As you can see even my 'host' tool is confused by it: syzop:~# host -a nonado.net nonado.net NS b.ns.bytemark.co.uk nonado.net NS c.ns.bytemark.co.uk nonado.net NS d.ns.bytemark.co.uk nonado.net NS a.ns.bytemark.co.uk syzop:~# host nonado.net nonado.net A 212.13.199.185 syzop:~# host -a nonado.net nonado.net NS b.ns.bytemark.co.uk nonado.net NS c.ns.bytemark.co.uk nonado.net NS d.ns.bytemark.co.uk nonado.net NS a.ns.bytemark.co.uk nonado.net A 212.13.199.185 it's suddenly there ;p. I plan to code the DNS stuff a bit differently for IPv6 in the future (after beta18 release, so will be in beta19), then these kinds of nameserver setups will also be supported :). |
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postponed to after beta19, sorry :p. |
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*bump* want to fix this before next release |
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damn, this is quite difficult to do (not theoretically, but with our practical implementation) :|. Since it's not that important but just a minor glitch in something that is not widely used && the risk involved of crashes/weird behavior after the "fix" is quite high (something I don't want to risk when we are finally getting out of the beta stage)... I've decided to postpone this for at least 6 months or so. Sorry kormat / Rocko :|. |
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Oh well, no problem, thats ok ;) |
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Fixed in CVS [.109]. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2003-09-17 14:32 | kormat | New Issue | |
| 2003-09-17 15:50 | syzop | Note Added: 0003673 | |
| 2003-09-17 16:32 | kormat | Note Added: 0003674 | |
| 2003-09-17 16:49 | kormat | File Added: debug.log | |
| 2003-09-17 16:50 | kormat | Note Added: 0003675 | |
| 2003-09-17 17:08 | kormat | Note Added: 0003676 | |
| 2003-09-17 17:23 | kormat | Note Edited: 0003676 | |
| 2003-09-17 18:17 | syzop | Note Added: 0003677 | |
| 2003-09-17 18:21 | syzop | Status | new => confirmed |
| 2003-09-17 18:21 | syzop | Summary | ircd has weird dns handling => IPv6 todo: improve dns lookup method ip4/ip6 |
| 2003-11-20 19:29 | syzop | Note Added: 0004072 | |
| 2004-01-30 03:27 | syzop | Note Added: 0004794 | |
| 2004-02-05 17:31 | syzop | Note Added: 0004883 | |
| 2004-02-05 20:35 | Rocko | Note Added: 0004885 | |
| 2004-07-22 17:20 | syzop | Status | confirmed => closed |
| 2004-07-22 17:20 | syzop | Note Added: 0007222 |
