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ns") (reaction (lookup-specification ((not unavailable) => return))))) ;; The NSS. We list all the databases here because that allows us to ;; statically ensure that the user's configuration refers to existing ;; databases. See libc/nss/databases.def for the list of databases. Default ;; values obtained by looking for "DEFAULT_CONFIG" in libc/nss/*.c. ;; ;; Although libc places 'dns' before 'files' in the default configurations of ;; the 'hosts' and 'networks' databases, we choose to put 'files' before 'dns' ;; by default, so that users can override host/address mappings in /etc/hosts ;; and bypass DNS to improve their privacy and escape NSA's MORECOWBELL. (define-record-type* <name-service-switch> name-service-switch make-name-service-switch name-service-switch? (aliases name-service-switch-aliases (default '())) (ethers name-service-switch-ethers (default '())) (group name-service-switch-group (default (list %files))) (gshadow name-service-switch-gshadow (default '())) (hosts name-service-switch-hosts (default (list %files %dns))) (initgroups name-service-switch-initgroups (default '())) (netgroup name-service-switch-netgroup (default '())) (networks name-service-switch-networks (default (list %files %dns))) (password name-service-switch-password (default (list %files))) (public-key name-service-switch-public-key (default '())) (rpc name-service-switch-rpc (default '())) (services name-service-switch-services (default '())) (shadow name-service-switch-shadow (default (list %files)))) (define %default-nss ;; Default NSS configuration. (name-service-switch)) (define %mdns-host-lookup-nss (name-service-switch (hosts (list %files ;first, check /etc/hosts ;; If the above did not succeed, try with 'mdns_minimal'. (name-service (name "mdns_minimal") ;; 'mdns_minimal' is authoritative for '.local'. When it ;; returns "not found", no need to try the next methods. (reaction (lookup-specification (not-found => return)))) ;; Then fall back to DNS. (name-service (name "dns")) ;; Finally, try with the "full" 'mdns'. (name-service (name "mdns")))))) ;;; ;;; Serialization. ;;; (define (lookup-status->string status) (match status ('success "SUCCESS") ('not-found "NOTFOUND") ('unavailable "UNAVAIL") ('try-again "TRYAGAIN") (($ <lookup-status-negation> status) (string-append "!" (lookup-status->string status))))) (define lookup-reaction->string (match-lambda (($ <lookup-reaction> status action) (string-append (lookup-status->string status) "=" (symbol->string action))))) (define name-service->string (match-lambda (($ <name-service> name ()) name) (($ <name-service> name reactions) (string-append name " [" (string-join (map lookup-reaction->string reactions)) "]")))) (define (name-service-switch->string nss) "Return the 'nsswitch.conf' contents for NSS as a string. See \"NSS Configuration File\" in the libc manual." (let-syntax ((->string (syntax-rules () ((_ name field) (match (field nss) (() ;keep the default config "") ((services (... ...)) (string-append name ":\t" (string-join (map name-service->string services)) "\n"))))))) (string-append (->string "aliases" name-service-switch-aliases) (->string "ethers" name-service-switch-ethers) (->string "group" name-service-switch-group) (->string "gshadow" name-service-switch-gshadow) (->string "hosts" name-service-switch-hosts) (->string "initgroups" name-service-switch-initgroups) (->string "netgroup" name-service-switch-netgroup) (->string "networks" name-service-switch-networks) (->string "passwd" name-service-switch-password) (->string "publickey" name-service-switch-public-key) (->string "rpc" name-service-switch-rpc) (->string "services" name-service-switch-services) (->string "shadow" name-service-switch-shadow)))) ;;; Local Variables: ;;; eval: (put 'name-service 'scheme-indent-function 0) ;;; eval: (put 'name-service-switch 'scheme-indent-function 0) ;;; End: ;;; nss.scm ends here
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