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ftp-client: Before 'PASV', try 'EPSV' first for IPv6.

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This fixes <https://bugs.gnu.org/46481>.

* guix/ftp-client.scm (ftp-epsv, ftp-passive): New procedures.
(ftp-list, ftp-retr): Replace call to 'ftp-pasv' with 'ftp-passive'.
This commit is contained in:
宋文武 2021-02-14 12:02:57 +08:00
parent 392e230d5e
commit 858898e348
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1 changed files with 13 additions and 2 deletions
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15
guix/ftp-client.scm
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@ -216,6 +216,17 @@ (define %pasv-rx
(else
(throw 'ftp-error conn "PASV" 227 message)))))
(define (ftp-epsv conn)
(let* ((message (%ftp-command "EPSV" 229 (ftp-connection-socket conn))))
(string->number
(match:substring (string-match "\\(...([0-9]+).\\)" message) 1))))
(define (ftp-passive conn)
"Enter passive mode using EPSV or PASV, return a data connection port on
success."
;; IPv6 only works with EPSV, so try it first.
(or (false-if-exception (ftp-epsv conn)) (ftp-pasv conn)))
(define (address-with-port sa port)
"Return a socket-address object based on SA, but with PORT."
(let ((fam (sockaddr:fam sa))
@ -232,7 +243,7 @@ (define* (ftp-list conn #:optional directory #:key timeout)
(if directory
(ftp-chdir conn directory))
(let* ((port (ftp-pasv conn))
(let* ((port (ftp-passive conn))
(ai (ftp-connection-addrinfo conn))
(s (socket (addrinfo:fam ai) (addrinfo:socktype ai)
(addrinfo:protocol ai))))
@ -281,7 +292,7 @@ (define* (ftp-retr conn file #:optional directory
;; Ask for "binary mode".
(%ftp-command "TYPE I" 200 (ftp-connection-socket conn))
(let* ((port (ftp-pasv conn))
(let* ((port (ftp-passive conn))
(ai (ftp-connection-addrinfo conn))
(s (with-fluids ((%default-port-encoding #f))
(socket (addrinfo:fam ai) (addrinfo:socktype ai)