Changes in 7.58.0 - January 24 2018

Changes:

• new libssh-powered SSH SCP/SFTP backend
• curl-config: add --ssl-backends

Bugfixes:

• http2: fix incorrect trailer buffer size
• http: prevent custom Authorization headers in redirects
• travis: add boringssl build
• examples/xmlstream.c: don't switch off CURL_GLOBAL_SSL
• SSL: Avoid magic allocation of SSL backend specific data
• lib: don't export all symbols, just everything curl_*
• libssh2: send the correct CURLE error code on scp file not found
• libssh2: return CURLE_UPLOAD_FAILED on failure to upload
• openssl: enable pkcs12 in boringssl builds
• libssh2: remove dead code from SSH_SFTP_QUOTE
• sasl_getmessage: make sure we have a long enough string to pass
• conncache: fix several lock issues
• threaded-shared-conn.c: new example
• conncache: only allow multiplexing within same multi handle
• configure: check for netinet/in6.h
• URL: tolerate backslash after drive letter for FILE:
• openldap: add commented out debug possibilities
• include: get netinet/in.h before linux/tcp.h
• CONNECT: keep close connection flag in http_connect_state struct
• BINDINGS: another PostgreSQL client
• curl: limit -# update frequency for unknown total size
• configure: add AX_CODE_COVERAGE only if using gcc
• curl.h: remove incorrect comment about ERRORBUFFER
• openssl: improve data-pending check for https proxy
• curl: remove __EMX__ #ifdefs
• CURLOPT_PRIVATE.3: fix grammar
• sftp: allow quoted commands to use relative paths
• CURLOPT_DNS_CACHE_TIMEOUT.3: see also CURLOPT_RESOLVE
• RESOLVE: output verbose text when trying to set a duplicate name
• openssl: Disable file buffering for Win32 SSLKEYLOGFILE
• multi_done: prune DNS cache
• tests: update .gitignore for libtests
• tests: mark data files as non-executable in git
• CURLOPT_DNS_LOCAL_IP4.3: fixed the "SEE ALSO" to not self-reference
• curl.1: documented two missing valid exit codes
• curl.1: mention http:// and https:// as valid proxy prefixes
• vtls: replaced getenv() with curl_getenv()
• setopt: less *or equal* than INT_MAX/1000 should be fine
• examples/smtp-mail.c: use separate defines for options and mail
• curl: support >256 bytes warning messages
• conncache: fix a return code
• krb5: fix a potential access of uninitialized memory
• rand: add a clang-analyzer work-around
• CURLOPT_READFUNCTION.3: refer to argument with correct name
• brotli: allow compiling with version 0.6.0
• content_encoding: rework zlib_inflate
• curl_easy_reset: release mime-related data
• examples/rtsp: fix error handling macros
• build-openssl.bat: Added support for VC15
• build-wolfssl.bat: Added support for VC15
• build: Added Visual Studio 2017 project files
• winbuild: Added support for VC15
• curl: Support size modifiers for --max-filesize
• examples/cacertinmem: ignore cert-already-exists error
• brotli: data at the end of content can be lost
• curl_version_info.3: call the argument 'age'
• openssl: fix memory leak of SSLKEYLOGFILE filename
• build: remove HAVE_LIMITS_H check
• --mail-rcpt: fix short-text description
• scripts: allow all perl scripts to be run directly
• progress: calculate transfer speed on milliseconds if possible
• system.h: check __LONG_MAX__ for defining curl_off_t
• easy: fix connection ownership in curl_easy_pause
• setopt: reintroduce non-static Curl_vsetopt() for OS400 support
• setopt: fix SSLVERSION to allow CURL_SSLVERSION_MAX_ values
• configure.ac: append extra linker flags instead of prepending them
• HTTP: bail out on negative Content-Length: values
• docs: comment about CURLE_READ_ERROR returned by curl_mime_filedata
• mime: clone mime tree upon easy handle duplication
• openssl: enable SSLKEYLOGFILE support by default
• smtp/pop3/imap_get_message: decrease the data length too...
• CURLOPT_TCP_NODELAY.3: fix typo
• SMB: fix numeric constant suffix and variable types
• ftp-wildcard: fix matching an empty string with "*[^a]"
• curl_fnmatch: only allow 5 '*' sections in a single pattern
• openssl: fix potential memory leak in SSLKEYLOGFILE logic
• SSH: Fix state machine for ssh-agent authentication
• examples/url2file.c: add missing curl_global_cleanup() call
• http2: don't close connection when single transfer is stopped
• libcurl-env.3: first version
• curl: progress bar refresh, get width using ioctl()
• CONNECT_TO: fail attempt to set an IPv6 numerical without IPv6 support

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