A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
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I am using curl_easy_setopt(CURLOPT_INTERFACE, "if!something") to force transfers to use a particular interface but the transfer fails with CURLE_INTERFACE_FAILED, "Failed binding local connection end" if the interface I specify has no IPv6 address. The cause is as follows: The remote hostname resolves successfully and has an IPv6 address and an IPv4 address. cURL attempts to connect to the IPv6 address first. bindlocal (in lib/connect.c) fails because Curl_if2ip cannot find an IPv6 address on the interface. This is a fatal error in singleipconnect() This change will make cURL try the next IP address in the list. Also included are two changes related to IPv6 address scope: - Filter the choice of address in Curl_if2ip to only consider addresses with the same scope ID as the connection address (mismatched scope for local and remote address does not result in a working connection). - bindlocal was ignoring the scope ID of addresses returned by Curl_if2ip . Now it uses them. Bug: http://curl.haxx.se/bug/view.cgi?id=1189 |
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README
Curl is a command line tool for transferring data specified with URL
syntax. Find out how to use curl by reading the curl.1 man page or the
MANUAL document. Find out how to install Curl by reading the INSTALL
document.
libcurl is the library curl is using to do its job. It is readily
available to be used by your software. Read the libcurl.3 man page to
learn how!
You find answers to the most frequent questions we get in the FAQ document.
Study the COPYING file for distribution terms and similar. If you distribute
curl binaries or other binaries that involve libcurl, you might enjoy the
LICENSE-MIXING document.
CONTACT
If you have problems, questions, ideas or suggestions, please contact us
by posting to a suitable mailing list. See http://curl.haxx.se/mail/
All contributors to the project are listed in the THANKS document.
WEB SITE
Visit the curl web site for the latest news and downloads:
http://curl.haxx.se/
GIT
To download the very latest source off the GIT server do this:
git clone git://github.com/bagder/curl.git
(you'll get a directory named curl created, filled with the source code)
NOTICE
Curl contains pieces of source code that is Copyright (c) 1998, 1999
Kungliga Tekniska Högskolan. This notice is included here to comply with the
distribution terms.