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Error 27 Out of memory occurs when the DoH server returns an failed response #12365

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lRoccoon opened this issue Nov 20, 2023 · 1 comment
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Error 27 Out of memory occurs when the DoH server returns an failed response #12365

lRoccoon opened this issue Nov 20, 2023 · 1 comment
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name lookup DNS and related tech

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@lRoccoon
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I did this

A DoH server (https://dig.bdurl.net/dns-query) has some problem，when I use this doh server and use -4, I got Error 27: Out of memory.

curl -4 --doh-url https://dig.bdurl.net/dns-query google.com
curl: (27) Out of memory

I suspect it's caused by TTL

* Connection #1 to host dig.bdurl.net left intact
* a DoH request is completed, 0 to go
* DoH: Too small type A for google.com
* DoH Host name: google.com
* TTL: 2147483647 seconds
* Closing connection 0
curl: (27) Out of memory

I expected the following

curl -4 --doh-url https://dig.bdurl.net/dns-query google.com
curl: (6) Couldn't resolve host name

curl/libcurl version

curl 8.1.2 (x86_64-apple-darwin23.0) libcurl/8.1.2 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.12 nghttp2/1.55.1
Release-Date: 2023-05-30
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS GSS-API HSTS HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL threadsafe UnixSockets

operating system

Linux 5.4.143
Mac OS 14.1
@bagder bagder added the name lookup DNS and related tech label Nov 20, 2023
@bagder
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bagder commented Nov 20, 2023

I can reproduce and I see why...

bagder added a commit that referenced this issue Nov 20, 2023
@bagder
doh: provide better return code for responses w/o addresses
7838e05 
Previously it was wrongly returning CURLE_OUT_OF_MEMORY when the
response did not contain any addresses. Now it more accurately returns
CURLE_COULDNT_RESOLVE_HOST.

Reported-by: lRoccoon on github

Fixes #12365
@bagder bagder mentioned this issue Nov 20, 2023
Closed
@bagder bagder closed this as completed in db5bf23 Nov 21, 2023
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doh: provide better return code for responses w/o addresses curl/curl
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@bagder @lRoccoon