diff options
Diffstat (limited to 'guix/build/syscalls.scm')
| -rw-r--r-- | guix/build/syscalls.scm | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm index 85de47d26e..9386c0f5d0 100644 --- a/guix/build/syscalls.scm +++ b/guix/build/syscalls.scm @@ -95,6 +95,8 @@ set-network-interface-netmask set-network-interface-up configure-network-interface + add-network-route/gateway + delete-network-route interface? interface-name @@ -805,6 +807,14 @@ exception if it's already taken." (if (string-contains %host-type "linux") #x891c ;GNU/Linux -1)) ;FIXME: GNU/Hurd? +(define SIOCADDRT + (if (string-contains %host-type "linux") + #x890B ;GNU/Linux + -1)) ;FIXME: GNU/Hurd? +(define SIOCDELRT + (if (string-contains %host-type "linux") + #x890C ;GNU/Linux + -1)) ;FIXME: GNU/Hurd? ;; Flags and constants from <net/if.h>. @@ -1090,6 +1100,106 @@ is true, it must be a socket address to use as the network mask." ;;; +;;; Network routes. +;;; + +(define-c-struct %rtentry ;'struct rtentry' from <net/route.h> + sizeof-rtentry + list + read-rtentry + write-rtentry! + (pad1 unsigned-long) + (destination (array uint8 16)) ;struct sockaddr + (gateway (array uint8 16)) ;struct sockaddr + (genmask (array uint8 16)) ;struct sockaddr + (flags unsigned-short) + (pad2 short) + (pad3 long) + (tos uint8) + (class uint8) + (pad4 (array uint8 (if (= 8 (sizeof* '*)) 3 1))) + (metric short) + (device '*) + (mtu unsigned-long) + (window unsigned-long) + (initial-rtt unsigned-short)) + +(define RTF_UP #x0001) ;'rtentry' flags from <net/route.h> +(define RTF_GATEWAY #x0002) + +(define %sockaddr-any + (make-socket-address AF_INET INADDR_ANY 0)) + +(define add-network-route/gateway + ;; To allow field names to be matched as literals, we need to move them out + ;; of the lambda's body since the parameters have the same name. A lot of + ;; fuss for very little. + (let-syntax ((gateway-offset (identifier-syntax + (c-struct-field-offset %rtentry gateway))) + (destination-offset (identifier-syntax + (c-struct-field-offset %rtentry destination))) + (genmask-offset (identifier-syntax + (c-struct-field-offset %rtentry genmask)))) + (lambda* (socket gateway + #:key (destination %sockaddr-any) (genmask %sockaddr-any)) + "Add a network route for DESTINATION (a socket address as returned by +'make-socket-address') that goes through GATEWAY (a socket address). For +instance, the call: + + (add-network-route/gateway sock + (make-socket-address + AF_INET + (inet-pton AF_INET \"192.168.0.1\") + 0)) + +is equivalent to this 'net-tools' command: + + route add -net default gw 192.168.0.1 + +because the default value of DESTINATION is \"0.0.0.0\"." + (let ((route (make-bytevector sizeof-rtentry 0))) + (write-socket-address! gateway route gateway-offset) + (write-socket-address! destination route destination-offset) + (write-socket-address! genmask route genmask-offset) + (bytevector-u16-native-set! route + (c-struct-field-offset %rtentry flags) + (logior RTF_UP RTF_GATEWAY)) + (let-values (((ret err) + (%ioctl (fileno socket) SIOCADDRT + (bytevector->pointer route)))) + (unless (zero? ret) + (throw 'system-error "add-network-route/gateway" + "add-network-route/gateway: ~A" + (list (strerror err)) + (list err)))))))) + +(define delete-network-route + (let-syntax ((destination-offset (identifier-syntax + (c-struct-field-offset %rtentry destination)))) + (lambda* (socket destination) + "Delete the network route for DESTINATION. For instance, the call: + + (delete-network-route sock + (make-socket-address AF_INET INADDR_ANY 0)) + +is equivalent to the 'net-tools' command: + + route del -net default +" + + (let ((route (make-bytevector sizeof-rtentry 0))) + (write-socket-address! destination route destination-offset) + (let-values (((ret err) + (%ioctl (fileno socket) SIOCDELRT + (bytevector->pointer route)))) + (unless (zero? ret) + (throw 'system-error "delete-network-route" + "delete-network-route: ~A" + (list (strerror err)) + (list err)))))))) + + +;;; ;;; Details about network interfaces---aka. 'getifaddrs'. ;;; |