101 lines
4.7 KiB
Groff
101 lines
4.7 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.TH libcurl-env 3 "August 22, 2023" "libcurl 8.3.0" "libcurl"
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.SH NAME
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libcurl-env \- environment variables libcurl understands
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.SH DESCRIPTION
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libcurl reads and understands a set of environment variables that if set
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controls and changes behaviors. This is the full list of variables to set and
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description of what they do. Also note that curl, the command line tool,
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supports a set of additional environment variables independently of this.
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.IP "[scheme]_proxy"
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When libcurl is given a URL to use in a transfer, it first extracts the
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"scheme" part from the URL and checks if there is a given proxy set for that
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in its corresponding environment variable. A URL like "https://example.com"
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makes libcurl use the "http_proxy" variable, while a URL like
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"ftp://example.com" uses the "ftp_proxy" variable.
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These proxy variables are also checked for in their uppercase versions, except
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the "http_proxy" one which is only used lowercase. Note also that some systems
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actually have a case insensitive handling of environment variables and then of
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course "HTTP_PROXY" still works.
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.IP ALL_PROXY
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This is a setting to set proxy for all URLs, independently of what scheme is
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being used. Note that the scheme specific variables overrides this one if set.
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.IP CURL_SSL_BACKEND
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When libcurl is built to support multiple SSL backends, it selects a specific
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backend at first use. If no selection is done by the program using libcurl,
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this variable's selection is used. Setting a name that is not a built-in
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alternative makes libcurl stay with the default.
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SSL backend names (case-insensitive): BearSSL, GnuTLS, mbedTLS,
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nss, OpenSSL, rustls, Schannel, Secure-Transport, wolfSSL
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.IP HOME
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When the netrc feature is used (\fICURLOPT_NETRC(3)\fP), this variable is
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checked as the primary way to find the "current" home directory in which
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the .netrc file is likely to exist.
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.IP USERPROFILE
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When the netrc feature is used (\fICURLOPT_NETRC(3)\fP), this variable is
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checked as the secondary way to find the "current" home directory (on Windows
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only) in which the .netrc file is likely to exist.
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.IP LOGNAME
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User name to use when invoking the \fIntlm-wb\fP tool, if \fINTLMUSER\fP was
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not set.
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.IP NO_PROXY
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This has the same functionality as the \fICURLOPT_NOPROXY(3)\fP option: it
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gives libcurl a comma-separated list of host name patterns for which libcurl
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should not use a proxy.
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.IP NTLMUSER
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User name to use when invoking the \fIntlm-wb\fP tool.
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.IP SSLKEYLOGFILE
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When set and libcurl runs with a SSL backend that supports this feature,
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libcurl saves SSL secrets into the given file name. Using those SSL secrets,
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other tools (such as Wireshark) can decrypt the SSL communication and
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analyze/view the traffic.
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These secrets and this file might be sensitive. Users are advised to take
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precautions so that they are not stolen or otherwise inadvertently revealed.
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.IP USER
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User name to use when invoking the \fIntlm-wb\fP tool, if \fINTLMUSER\fP and
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\fILOGNAME\fP were not set.
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.SH "Debug Variables"
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There 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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.IP "CURL_GETHOSTNAME"
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Debug-only variable.
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.IP "CURL_FORCETIME"
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Debug-only variable.
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.IP "CURL_ENTROPY"
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Debug-only variable. Used to set a fixed faked value to use instead of a
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proper random number so that functions in libcurl that are otherwise getting
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random outputs can be tested for what they generate.
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.IP "CURL_TRACE"
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Debug-only variable. Used for debugging the lib/ldap implementation.
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.IP "CURL_NTLM_WB_FILE"
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Debug-only variable. Used to set to a debug-version of the \fIntlm-wb\fP
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executable.
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.IP "CURL_OPENLDAP_TRACE"
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Debug-only variable. Used for debugging the OpenLDAP implementation.
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