diff options
Diffstat (limited to 'contrib/unbound/util/proxy_protocol.c')
-rw-r--r-- | contrib/unbound/util/proxy_protocol.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/contrib/unbound/util/proxy_protocol.c b/contrib/unbound/util/proxy_protocol.c new file mode 100644 index 000000000000..757c5141db96 --- /dev/null +++ b/contrib/unbound/util/proxy_protocol.c @@ -0,0 +1,139 @@ +/* + * util/proxy_protocol.c - event notification + * + * Copyright (c) 2022, NLnet Labs. All rights reserved. + * + * This software is open source. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of the NLNET LABS nor the names of its contributors may + * be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/** + * \file + * + * This file contains PROXY protocol functions. + */ +#include "config.h" +#include "util/log.h" +#include "util/proxy_protocol.h" + +int +pp2_write_to_buf(struct sldns_buffer* buf, struct sockaddr_storage* src, + int stream) +{ + int af; + if(!src) return 0; + af = (int)((struct sockaddr_in*)src)->sin_family; + if(sldns_buffer_remaining(buf) < + PP2_HEADER_SIZE + (af==AF_INET?12:36)) { + return 0; + } + /* sig */ + sldns_buffer_write(buf, PP2_SIG, PP2_SIG_LEN); + /* version and command */ + sldns_buffer_write_u8(buf, (PP2_VERSION << 4) | PP2_CMD_PROXY); + if(af==AF_INET) { + /* family and protocol */ + sldns_buffer_write_u8(buf, + (PP2_AF_INET<<4) | + (stream?PP2_PROT_STREAM:PP2_PROT_DGRAM)); + /* length */ + sldns_buffer_write_u16(buf, 12); + /* src addr */ + sldns_buffer_write(buf, + &((struct sockaddr_in*)src)->sin_addr.s_addr, 4); + /* dst addr */ + sldns_buffer_write_u32(buf, 0); + /* src port */ + sldns_buffer_write(buf, + &((struct sockaddr_in*)src)->sin_port, 2); + /* dst port */ + sldns_buffer_write_u16(buf, 0); + } else { + /* family and protocol */ + sldns_buffer_write_u8(buf, + (PP2_AF_INET6<<4) | + (stream?PP2_PROT_STREAM:PP2_PROT_DGRAM)); + /* length */ + sldns_buffer_write_u16(buf, 36); + /* src addr */ + sldns_buffer_write(buf, + &((struct sockaddr_in6*)src)->sin6_addr, 16); + /* dst addr */ + sldns_buffer_set_at(buf, + sldns_buffer_position(buf), 0, 16); + sldns_buffer_skip(buf, 16); + /* src port */ + sldns_buffer_write(buf, + &((struct sockaddr_in6*)src)->sin6_port, 2); + /* dst port */ + sldns_buffer_write_u16(buf, 0); + } + return 1; +} + +struct pp2_header* +pp2_read_header(struct sldns_buffer* buf) +{ + size_t size; + struct pp2_header* header = (struct pp2_header*)sldns_buffer_begin(buf); + /* Try to fail all the unsupported cases first. */ + if(sldns_buffer_remaining(buf) < PP2_HEADER_SIZE) { + log_err("proxy_protocol: not enough space for header"); + return NULL; + } + /* Check for PROXYv2 header */ + if(memcmp(header, PP2_SIG, PP2_SIG_LEN) != 0 || + ((header->ver_cmd & 0xF0)>>4) != PP2_VERSION) { + log_err("proxy_protocol: could not match PROXYv2 header"); + return NULL; + } + /* Check the length */ + size = PP2_HEADER_SIZE + ntohs(header->len); + if(sldns_buffer_remaining(buf) < size) { + log_err("proxy_protocol: not enough space for header"); + return NULL; + } + /* Check for supported commands */ + if((header->ver_cmd & 0xF) != PP2_CMD_LOCAL && + (header->ver_cmd & 0xF) != PP2_CMD_PROXY) { + log_err("proxy_protocol: unsupported command"); + return NULL; + } + /* Check for supported family and protocol */ + if(header->fam_prot != 0x00 /* AF_UNSPEC|UNSPEC */ && + header->fam_prot != 0x11 /* AF_INET|STREAM */ && + header->fam_prot != 0x12 /* AF_INET|DGRAM */ && + header->fam_prot != 0x21 /* AF_INET6|STREAM */ && + header->fam_prot != 0x22 /* AF_INET6|DGRAM */) { + log_err("proxy_protocol: unsupported family and protocol"); + return NULL; + } + /* We have a correct header */ + return header; +} |