From ca67b09c015d4af3ae3cce12aa72e60941dbb8b5 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:52 +0200 Subject: Adding debian version 2.06-13+deb12u1. Signed-off-by: Daniel Baumann --- debian/grub-extras/disabled/gpxe/src/core/resolv.c | 415 +++++++++++++++++++++ 1 file changed, 415 insertions(+) create mode 100644 debian/grub-extras/disabled/gpxe/src/core/resolv.c (limited to 'debian/grub-extras/disabled/gpxe/src/core/resolv.c') diff --git a/debian/grub-extras/disabled/gpxe/src/core/resolv.c b/debian/grub-extras/disabled/gpxe/src/core/resolv.c new file mode 100644 index 0000000..6f01f93 --- /dev/null +++ b/debian/grub-extras/disabled/gpxe/src/core/resolv.c @@ -0,0 +1,415 @@ +/* + * Copyright (C) 2007 Michael Brown . + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/** @file + * + * Name resolution + * + */ + +/*************************************************************************** + * + * Name resolution interfaces + * + *************************************************************************** + */ + +/** + * Name resolution completed + * + * @v resolv Name resolution interface + * @v sa Completed socket address (if successful) + * @v rc Final status code + */ +void resolv_done ( struct resolv_interface *resolv, struct sockaddr *sa, + int rc ) { + struct resolv_interface *dest = resolv_get_dest ( resolv ); + + resolv_unplug ( resolv ); + dest->op->done ( dest, sa, rc ); + resolv_put ( dest ); +} + +/** + * Ignore name resolution done() event + * + * @v resolv Name resolution interface + * @v sa Completed socket address (if successful) + * @v rc Final status code + */ +void ignore_resolv_done ( struct resolv_interface *resolv __unused, + struct sockaddr *sa __unused, int rc __unused ) { + /* Do nothing */ +} + +/** Null name resolution interface operations */ +struct resolv_interface_operations null_resolv_ops = { + .done = ignore_resolv_done, +}; + +/** Null name resolution interface */ +struct resolv_interface null_resolv = { + .intf = { + .dest = &null_resolv.intf, + .refcnt = NULL, + }, + .op = &null_resolv_ops, +}; + +/*************************************************************************** + * + * Numeric name resolver + * + *************************************************************************** + */ + +/** A numeric name resolver */ +struct numeric_resolv { + /** Reference counter */ + struct refcnt refcnt; + /** Name resolution interface */ + struct resolv_interface resolv; + /** Process */ + struct process process; + /** Completed socket address */ + struct sockaddr sa; + /** Overall status code */ + int rc; +}; + +static void numeric_step ( struct process *process ) { + struct numeric_resolv *numeric = + container_of ( process, struct numeric_resolv, process ); + + resolv_done ( &numeric->resolv, &numeric->sa, numeric->rc ); + process_del ( process ); +} + +static int numeric_resolv ( struct resolv_interface *resolv, + const char *name, struct sockaddr *sa ) { + struct numeric_resolv *numeric; + struct sockaddr_in *sin; + + /* Allocate and initialise structure */ + numeric = zalloc ( sizeof ( *numeric ) ); + if ( ! numeric ) + return -ENOMEM; + resolv_init ( &numeric->resolv, &null_resolv_ops, &numeric->refcnt ); + process_init ( &numeric->process, numeric_step, &numeric->refcnt ); + memcpy ( &numeric->sa, sa, sizeof ( numeric->sa ) ); + + DBGC ( numeric, "NUMERIC %p attempting to resolve \"%s\"\n", + numeric, name ); + + /* Attempt to resolve name */ + sin = ( ( struct sockaddr_in * ) &numeric->sa ); + sin->sin_family = AF_INET; + if ( inet_aton ( name, &sin->sin_addr ) == 0 ) + numeric->rc = -EINVAL; + + /* Attach to parent interface, mortalise self, and return */ + resolv_plug_plug ( &numeric->resolv, resolv ); + ref_put ( &numeric->refcnt ); + return 0; +} + +struct resolver numeric_resolver __resolver ( RESOLV_NUMERIC ) = { + .name = "NUMERIC", + .resolv = numeric_resolv, +}; + +/*************************************************************************** + * + * Name resolution multiplexer + * + *************************************************************************** + */ + +/** A name resolution multiplexer */ +struct resolv_mux { + /** Reference counter */ + struct refcnt refcnt; + /** Parent name resolution interface */ + struct resolv_interface parent; + + /** Child name resolution interface */ + struct resolv_interface child; + /** Current child resolver */ + struct resolver *resolver; + + /** Socket address to complete */ + struct sockaddr sa; + /** Name to be resolved + * + * Must be at end of structure + */ + char name[0]; +}; + +/** + * Try current child name resolver + * + * @v mux Name resolution multiplexer + * @ret rc Return status code + */ +static int resolv_mux_try ( struct resolv_mux *mux ) { + struct resolver *resolver = mux->resolver; + int rc; + + DBGC ( mux, "RESOLV %p trying method %s\n", mux, resolver->name ); + + if ( ( rc = resolver->resolv ( &mux->child, mux->name, + &mux->sa ) ) != 0 ) { + DBGC ( mux, "RESOLV %p could not use method %s: %s\n", + mux, resolver->name, strerror ( rc ) ); + return rc; + } + + return 0; +} + +/** + * Handle done() event from child name resolver + * + * @v resolv Child name resolution interface + * @v sa Completed socket address (if successful) + * @v rc Final status code + */ +static void resolv_mux_done ( struct resolv_interface *resolv, + struct sockaddr *sa, int rc ) { + struct resolv_mux *mux = + container_of ( resolv, struct resolv_mux, child ); + + /* Unplug child */ + resolv_unplug ( &mux->child ); + + /* If this resolution succeeded, stop now */ + if ( rc == 0 ) { + DBGC ( mux, "RESOLV %p succeeded using method %s\n", + mux, mux->resolver->name ); + goto finished; + } + + /* Attempt next child resolver, if possible */ + mux->resolver++; + if ( mux->resolver >= table_end ( RESOLVERS ) ) { + DBGC ( mux, "RESOLV %p failed to resolve name\n", mux ); + goto finished; + } + if ( ( rc = resolv_mux_try ( mux ) ) != 0 ) + goto finished; + + /* Next resolver is now running */ + return; + + finished: + resolv_done ( &mux->parent, sa, rc ); +} + +/** Name resolution multiplexer operations */ +static struct resolv_interface_operations resolv_mux_child_ops = { + .done = resolv_mux_done, +}; + +/** + * Start name resolution + * + * @v resolv Name resolution interface + * @v name Name to resolve + * @v sa Socket address to complete + * @ret rc Return status code + */ +int resolv ( struct resolv_interface *resolv, const char *name, + struct sockaddr *sa ) { + struct resolv_mux *mux; + size_t name_len = ( strlen ( name ) + 1 ); + int rc; + + /* Allocate and initialise structure */ + mux = zalloc ( sizeof ( *mux ) + name_len ); + if ( ! mux ) + return -ENOMEM; + resolv_init ( &mux->parent, &null_resolv_ops, &mux->refcnt ); + resolv_init ( &mux->child, &resolv_mux_child_ops, &mux->refcnt ); + mux->resolver = table_start ( RESOLVERS ); + memcpy ( &mux->sa, sa, sizeof ( mux->sa ) ); + memcpy ( mux->name, name, name_len ); + + DBGC ( mux, "RESOLV %p attempting to resolve \"%s\"\n", mux, name ); + + /* Start first resolver in chain. There will always be at + * least one resolver (the numeric resolver), so no need to + * check for the zero-resolvers-available case. + */ + if ( ( rc = resolv_mux_try ( mux ) ) != 0 ) + goto err; + + /* Attach parent interface, mortalise self, and return */ + resolv_plug_plug ( &mux->parent, resolv ); + ref_put ( &mux->refcnt ); + return 0; + + err: + ref_put ( &mux->refcnt ); + return rc; +} + +/*************************************************************************** + * + * Named socket opening + * + *************************************************************************** + */ + +/** A named socket */ +struct named_socket { + /** Reference counter */ + struct refcnt refcnt; + /** Data transfer interface */ + struct xfer_interface xfer; + /** Name resolution interface */ + struct resolv_interface resolv; + /** Communication semantics (e.g. SOCK_STREAM) */ + int semantics; + /** Stored local socket address, if applicable */ + struct sockaddr local; + /** Stored local socket address exists */ + int have_local; +}; + +/** + * Finish using named socket + * + * @v named Named socket + * @v rc Reason for finish + */ +static void named_done ( struct named_socket *named, int rc ) { + + /* Close all interfaces */ + resolv_nullify ( &named->resolv ); + xfer_nullify ( &named->xfer ); + xfer_close ( &named->xfer, rc ); +} + +/** + * Handle close() event + * + * @v xfer Data transfer interface + * @v rc Reason for close + */ +static void named_xfer_close ( struct xfer_interface *xfer, int rc ) { + struct named_socket *named = + container_of ( xfer, struct named_socket, xfer ); + + named_done ( named, rc ); +} + +/** Named socket opener data transfer interface operations */ +static struct xfer_interface_operations named_xfer_ops = { + .close = named_xfer_close, + .vredirect = ignore_xfer_vredirect, + .window = no_xfer_window, + .alloc_iob = default_xfer_alloc_iob, + .deliver_iob = xfer_deliver_as_raw, + .deliver_raw = ignore_xfer_deliver_raw, +}; + +/** + * Handle done() event + * + * @v resolv Name resolution interface + * @v sa Completed socket address (if successful) + * @v rc Final status code + */ +static void named_resolv_done ( struct resolv_interface *resolv, + struct sockaddr *sa, int rc ) { + struct named_socket *named = + container_of ( resolv, struct named_socket, resolv ); + + /* Redirect if name resolution was successful */ + if ( rc == 0 ) { + rc = xfer_redirect ( &named->xfer, LOCATION_SOCKET, + named->semantics, sa, + ( named->have_local ? + &named->local : NULL ) ); + } + + /* Terminate resolution */ + named_done ( named, rc ); +} + +/** Named socket opener name resolution interface operations */ +static struct resolv_interface_operations named_resolv_ops = { + .done = named_resolv_done, +}; + +/** + * Open named socket + * + * @v semantics Communication semantics (e.g. SOCK_STREAM) + * @v peer Peer socket address to complete + * @v name Name to resolve + * @v local Local socket address, or NULL + * @ret rc Return status code + */ +int xfer_open_named_socket ( struct xfer_interface *xfer, int semantics, + struct sockaddr *peer, const char *name, + struct sockaddr *local ) { + struct named_socket *named; + int rc; + + /* Allocate and initialise structure */ + named = zalloc ( sizeof ( *named ) ); + if ( ! named ) + return -ENOMEM; + xfer_init ( &named->xfer, &named_xfer_ops, &named->refcnt ); + resolv_init ( &named->resolv, &named_resolv_ops, &named->refcnt ); + named->semantics = semantics; + if ( local ) { + memcpy ( &named->local, local, sizeof ( named->local ) ); + named->have_local = 1; + } + + DBGC ( named, "RESOLV %p opening named socket \"%s\"\n", + named, name ); + + /* Start name resolution */ + if ( ( rc = resolv ( &named->resolv, name, peer ) ) != 0 ) + goto err; + + /* Attach parent interface, mortalise self, and return */ + xfer_plug_plug ( &named->xfer, xfer ); + ref_put ( &named->refcnt ); + return 0; + + err: + ref_put ( &named->refcnt ); + return rc; +} -- cgit v1.2.3