Reapply643f9a0581
.64d318ea98
was a mismerge during fake rebase. Let's reapply it. Changes include: Added ACL per interface, proxy protocol and bug fixes. Announcement: https://nlnetlabs.nl/news/2022/Oct/13/unbound-1.17.0-released/ Merge commit '643f9a0581e8aac7eb790ced1164748939829826' into main
140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/*
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* util/proxy_protocol.c - event notification
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*
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* Copyright (c) 2022, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains PROXY protocol functions.
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*/
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#include "config.h"
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#include "util/log.h"
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#include "util/proxy_protocol.h"
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int
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pp2_write_to_buf(struct sldns_buffer* buf, struct sockaddr_storage* src,
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int stream)
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{
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int af;
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if(!src) return 0;
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af = (int)((struct sockaddr_in*)src)->sin_family;
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if(sldns_buffer_remaining(buf) <
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PP2_HEADER_SIZE + (af==AF_INET?12:36)) {
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return 0;
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}
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/* sig */
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sldns_buffer_write(buf, PP2_SIG, PP2_SIG_LEN);
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/* version and command */
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sldns_buffer_write_u8(buf, (PP2_VERSION << 4) | PP2_CMD_PROXY);
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if(af==AF_INET) {
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/* family and protocol */
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sldns_buffer_write_u8(buf,
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(PP2_AF_INET<<4) |
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(stream?PP2_PROT_STREAM:PP2_PROT_DGRAM));
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/* length */
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sldns_buffer_write_u16(buf, 12);
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/* src addr */
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sldns_buffer_write(buf,
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&((struct sockaddr_in*)src)->sin_addr.s_addr, 4);
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/* dst addr */
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sldns_buffer_write_u32(buf, 0);
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/* src port */
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sldns_buffer_write(buf,
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&((struct sockaddr_in*)src)->sin_port, 2);
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/* dst port */
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sldns_buffer_write_u16(buf, 0);
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} else {
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/* family and protocol */
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sldns_buffer_write_u8(buf,
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(PP2_AF_INET6<<4) |
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(stream?PP2_PROT_STREAM:PP2_PROT_DGRAM));
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/* length */
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sldns_buffer_write_u16(buf, 36);
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/* src addr */
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sldns_buffer_write(buf,
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&((struct sockaddr_in6*)src)->sin6_addr, 16);
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/* dst addr */
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sldns_buffer_set_at(buf,
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sldns_buffer_position(buf), 0, 16);
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sldns_buffer_skip(buf, 16);
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/* src port */
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sldns_buffer_write(buf,
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&((struct sockaddr_in6*)src)->sin6_port, 2);
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/* dst port */
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sldns_buffer_write_u16(buf, 0);
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}
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return 1;
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}
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struct pp2_header*
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pp2_read_header(struct sldns_buffer* buf)
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{
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size_t size;
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struct pp2_header* header = (struct pp2_header*)sldns_buffer_begin(buf);
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/* Try to fail all the unsupported cases first. */
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if(sldns_buffer_remaining(buf) < PP2_HEADER_SIZE) {
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log_err("proxy_protocol: not enough space for header");
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return NULL;
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}
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/* Check for PROXYv2 header */
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if(memcmp(header, PP2_SIG, PP2_SIG_LEN) != 0 ||
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((header->ver_cmd & 0xF0)>>4) != PP2_VERSION) {
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log_err("proxy_protocol: could not match PROXYv2 header");
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return NULL;
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}
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/* Check the length */
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size = PP2_HEADER_SIZE + ntohs(header->len);
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if(sldns_buffer_remaining(buf) < size) {
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log_err("proxy_protocol: not enough space for header");
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return NULL;
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}
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/* Check for supported commands */
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if((header->ver_cmd & 0xF) != PP2_CMD_LOCAL &&
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(header->ver_cmd & 0xF) != PP2_CMD_PROXY) {
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log_err("proxy_protocol: unsupported command");
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return NULL;
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}
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/* Check for supported family and protocol */
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if(header->fam_prot != 0x00 /* AF_UNSPEC|UNSPEC */ &&
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header->fam_prot != 0x11 /* AF_INET|STREAM */ &&
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header->fam_prot != 0x12 /* AF_INET|DGRAM */ &&
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header->fam_prot != 0x21 /* AF_INET6|STREAM */ &&
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header->fam_prot != 0x22 /* AF_INET6|DGRAM */) {
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log_err("proxy_protocol: unsupported family and protocol");
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return NULL;
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}
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/* We have a correct header */
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return header;
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}
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