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services: dnsmasq: Add TFTP configuration fields.

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* gnu/services/dns.scm (<dnsmasq-configuration>): Add TFTP configuration
fields.
(dnsmasq-shepherd-service): Use them.
* doc/guix.texi (DNS Services): Document them.
This commit is contained in:
Danny Milosavljevic 2020-09-27 21:06:30 +02:00
parent 3e34f89980
commit 34d1c0a03b
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2 changed files with 121 additions and 3 deletions
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54
doc/guix.texi
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@ -23363,6 +23363,60 @@ disables caching.
@item @code{negative-cache?} (default: @code{#t})
When false, disable negative caching.
@item @code{tftp-enable?} (default: @code{#f})
Whether to enable the built-in TFTP server.
@item @code{tftp-no-fail?} (default: @code{#f})
If true, does not fail dnsmasq if the TFTP server could not start up.
@item @code{tftp-single-port?} (default: @code{#f})
Whether to use only one single port for TFTP.
@item @code{tftp-secure?} (default: @code{#f})
If true, only files owned by the user running the dnsmasq process are accessible.
If dnsmasq is being run as root, different rules apply:
@code{tftp-secure?} has no effect, but only files which have the
world-readable bit set are accessible.
@item @code{tftp-max} (default: @code{#f})
If set, sets the maximal number of concurrent connections allowed.
@item @code{tftp-mtu} (default: @code{#f})
If set, sets the MTU for TFTP packets to that value.
@item @code{tftp-no-blocksize?} (default: @code{#f})
If true, stops the TFTP server from negotiating the blocksize with a client.
@item @code{tftp-lowercase?} (default: @code{#f})
Whether to convert all filenames in TFTP requests to lowercase.
@item @code{tftp-port-range} (default: @code{#f})
If set, fixes the dynamical ports (one per client) to the given range
(@code{"<start>,<end>"}).
@item @code{tftp-root} (default: @code{/var/empty,lo})
Look for files to transfer using TFTP relative to the given directory.
When this is set, TFTP paths which include ".." are rejected, to stop clients
getting outside the specified root. Absolute paths (starting with /) are
allowed, but they must be within the tftp-root. If the optional interface
argument is given, the directory is only used for TFTP requests via that
interface.
@item @code{tftp-unique-root} (default: @code{#f})
If set, add the IP or hardware address of the TFTP client as a path component
on the end of the TFTP-root. Only valid if a TFTP root is set and the
directory exists. Defaults to adding IP address (in standard dotted-quad
format).
For instance, if --tftp-root is "/tftp" and client 1.2.3.4 requests file
"myfile" then the effective path will be "/tftp/1.2.3.4/myfile" if
/tftp/1.2.3.4 exists or /tftp/myfile otherwise. When "=mac" is specified
it will append the MAC address instead, using lowercase zero padded digits
separated by dashes, e.g.: 01-02-03-04-aa-bb Note that resolving MAC
addresses is only possible if the client is in the local network or obtained
a DHCP lease from dnsmasq.
@end table
@end deftp

70
gnu/services/dns.scm
View file

@ -757,7 +757,29 @@ (define-record-type* <dnsmasq-configuration>
(cache-size dnsmasq-configuration-cache-size
(default 150)) ;integer
(negative-cache? dnsmasq-configuration-negative-cache?
(default #t))) ;boolean
(default #t)) ;boolean
(tftp-enable? dnsmasq-configuration-tftp-enable?
(default #f)) ;boolean
(tftp-no-fail? dnsmasq-configuration-tftp-no-fail?
(default #f)) ;boolean
(tftp-single-port? dnsmasq-configuration-tftp-single-port?
(default #f)) ;boolean
(tftp-secure? dnsmasq-tftp-secure?
(default #f)) ;boolean
(tftp-max dnsmasq-tftp-max
(default #f)) ;integer
(tftp-mtu dnsmasq-tftp-mtu
(default #f)) ;integer
(tftp-no-blocksize? dnsmasq-tftp-no-blocksize?
(default #f)) ;boolean
(tftp-lowercase? dnsmasq-tftp-lowercase?
(default #f)) ;boolean
(tftp-port-range dnsmasq-tftp-port-range
(default #f)) ;string
(tftp-root dnsmasq-tftp-root
(default "/var/empty,lo")) ;string
(tftp-unique-root dnsmasq-tftp-unique-root
(default #f))) ;"" or "ip" or "mac"
(define dnsmasq-shepherd-service
(match-lambda
@ -765,7 +787,12 @@ (define dnsmasq-shepherd-service
no-hosts?
port local-service? listen-addresses
resolv-file no-resolv? servers
addresses cache-size negative-cache?)
addresses cache-size negative-cache?
tftp-enable? tftp-no-fail?
tftp-single-port? tftp-secure?
tftp-max tftp-mtu tftp-no-blocksize?
tftp-lowercase? tftp-port-range
tftp-root tftp-unique-root)
(shepherd-service
(provision '(dnsmasq))
(requirement '(networking))
@ -794,7 +821,44 @@ (define dnsmasq-shepherd-service
#$(format #f "--cache-size=~a" cache-size)
#$@(if negative-cache?
'()
'("--no-negcache")))
'("--no-negcache"))
#$@(if tftp-enable?
'("--enable-tftp")
'())
#$@(if tftp-no-fail?
'("--tftp-no-fail")
'())
#$@(if tftp-single-port?
'("--tftp-single-port")
'())
#$@(if tftp-secure?
'("--tftp-secure?")
'())
#$@(if tftp-max
(list (format #f "--tftp-max=~a" tftp-max))
'())
#$@(if tftp-mtu
(list (format #f "--tftp-mtu=~a" tftp-mtu))
'())
#$@(if tftp-no-blocksize?
'("--tftp-no-blocksize")
'())
#$@(if tftp-lowercase?
'("--tftp-lowercase")
'())
#$@(if tftp-port-range
(list (format #f "--tftp-port-range=~a"
tftp-port-range))
'())
#$@(if tftp-root
(list (format #f "--tftp-root=~a" tftp-root))
'())
#$@(if tftp-unique-root
(list
(if (> (length tftp-unique-root) 0)
(format #f "--tftp-unique-root=~a" tftp-unique-root)
(format #f "--tftp-unique-root")))
'()))
#:pid-file "/run/dnsmasq.pid"))
(stop #~(make-kill-destructor))))))