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02e9690c3e
Currently the DNS server only responds to A and AAAA queries. It always responds with a fixed response: the localhost address. Three times. It should work fine over either IPv4 or IPv6, but I don't think it matters much for curl testing. The idea is to allow curl tests to use "normal" DNS hostnames (using the normal name resolving code paths) and still use the local test servers. This setup currently only works if curl is built with c-ares because redirecting DNS requests to our test server when using getaddrinfo() is not easy. This should be extended to respond to HTTPS queries as well to allow more testing there, as c-ares is always used for that. Test 2102 is the first test using this. Closes #17015
160 lines
4.6 KiB
Markdown
160 lines
4.6 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: libcurl-env-dbg
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Section: 3
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Source: libcurl
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See-also:
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- libcurl-env (3)
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Protocol:
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- All
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Added-in: n/a
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---
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# NAME
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libcurl-env-dbg - environment variables libcurl DEBUGBUILD understands
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# DESCRIPTION
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This is a set of variables only recognized and used if libcurl was built
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"debug enabled", which should never be true for a library used in production.
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These variables are intended for internal use only, subject to change and have
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many effects on the behavior of libcurl. Refer to the source code to determine
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how exactly they are being used.
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## `CURL_ALTSVC_HTTP`
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Bypass the AltSvc HTTPS protocol restriction if this variable exists.
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## `CURL_DBG_SOCK_RBLOCK`
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The percentage of recv() calls that should be answered with a EAGAIN at random.
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For TCP/UNIX sockets.
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## `CURL_DBG_SOCK_RMAX`
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The maximum data that shall be received from the network in one recv() call.
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For TCP/UNIX sockets. This is applied to every recv.
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Example: **CURL_DBG_SOCK_RMAX=400** means recv buffer size is limited to a
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maximum of 400 bytes.
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## `CURL_DBG_SOCK_WBLOCK`
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The percentage of send() calls that should be answered with a EAGAIN at random.
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For TCP/UNIX sockets.
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## `CURL_DBG_SOCK_WPARTIAL`
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The percentage of data that shall be written to the network. For TCP/UNIX
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sockets. This is applied to every send.
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Example: **CURL_DBG_SOCK_WPARTIAL=80** means a send with 1000 bytes would
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only send 800.
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## `CURL_DBG_QUIC_WBLOCK`
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The percentage of send() calls that should be answered with EAGAIN at random.
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QUIC only.
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## `CURL_DEBUG`
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Trace logging behavior as an alternative to calling curl_global_trace(3).
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Example: **CURL_DEBUG=http/2** means trace details about HTTP/2 handling.
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In the curl command line tool, built with `--enable-debug`, this environment
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variable adds to arguments like `--verbose`, `-vvv`. At least a single `-v`
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is needed to make the run emit trace output, but when it does, the contents
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of `CURL_DEBUG` are added and can override existing options.
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Example: **CURL_DEBUG=tcp,-http/2 curl -vv url** means trace protocol details,
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triggered by `-vv`, add tracing of TCP in addition and remove tracing of
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HTTP/2.
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## `CURL_DEBUG_SIZE`
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Fake the size returned by CURLINFO_HEADER_SIZE and CURLINFO_REQUEST_SIZE.
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## `CURL_DNS_SERVER`
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When built with c-ares for name resolving, setting this environment variable
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to `[IP:port]` makes libcurl use that DNS server instead of the system
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default. This is used by the curl test suite.
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## `CURL_GETHOSTNAME`
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Fake the local machine's unqualified hostname for NTLM and SMTP.
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## `CURL_HSTS_HTTP`
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Bypass the HSTS HTTPS protocol restriction if this variable exists.
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## `CURL_FORCETIME`
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A time of 0 is used for AWS signatures and NTLM if this variable exists.
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## `CURL_ENTROPY`
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A fixed faked value to use instead of a proper random number so that functions
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in libcurl that are otherwise getting random outputs can be tested for what
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they generate.
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## `CURL_SMALLREQSEND`
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An alternative size of HTTP data to be sent at a time only if smaller than the
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current.
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## `CURL_SMALLSENDS`
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An alternative size of socket data to be sent at a time only if smaller than
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the current.
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## `CURL_TIME`
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Fake Unix timestamp to use for AltSvc, HSTS and CURLINFO variables that are
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time related.
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This variable can also be used to fake the data returned by some CURLINFO
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variables that are not time-related (such as CURLINFO_LOCAL_PORT), and in that
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case the value is not a timestamp.
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## `CURL_TRACE`
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LDAP tracing is enabled if this variable exists and its value is 1 or greater.
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OpenLDAP tracing is separate. Refer to CURL_OPENLDAP_TRACE.
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## `CURL_OPENLDAP_TRACE`
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OpenLDAP tracing is enabled if this variable exists and its value is 1 or
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greater. There is a number of debug levels, refer to *openldap.c* comments.
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## `CURL_WS_CHUNK_SIZE`
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Used to influence the buffer chunk size used for WebSocket encoding and
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decoding.
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## `CURL_WS_CHUNK_EAGAIN`
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Used to simulate blocking sends after this chunk size for WebSocket
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connections.
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## `CURL_FORBID_REUSE`
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Used to set the CURLOPT_FORBID_REUSE flag on each transfer initiated
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by the curl command line tool. The value of the environment variable
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does not matter.
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## `CURL_GRACEFUL_SHUTDOWN`
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Make a blocking, graceful shutdown of all remaining connections when
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a multi handle is destroyed. This implicitly triggers for easy handles
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that are run via easy_perform. The value of the environment variable
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gives the shutdown timeout in milliseconds.
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## `CURL_H2_STREAM_WIN_MAX`
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Set to a positive 32-bit number to override the HTTP/2 stream window's
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default of 10MB. Used in testing to verify correct window update handling.
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