diff options
author | Oliver Smith <osmith@sysmocom.de> | 2019-11-20 10:56:35 +0100 |
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committer | Oliver Smith <osmith@sysmocom.de> | 2020-01-13 14:10:50 +0100 |
commit | 3a9f2679837e793e5520685f3b65730208098ecd (patch) | |
tree | 81f670b421d499617e5b922b6585ef09977f9a2c /include/osmocom/mslookup/mdns_msg.h | |
parent | 5436c77a96b5cfb6d1b7ad8c074089e4ab6e9daa (diff) |
add mDNS lookup method to libosmo-mslookup (#2)
Add the first actually useful lookup method to the mslookup library: multicast
DNS.
The server side is added in a subsequent commit, when the mslookup server is
implemented for the osmo-hlr program.
Use custom DNS encoding instead of libc-ares (which we use in OsmoSGSN
already), because libc-ares is only a DNS client implementation and we will
need both client and server.
Resubmit of f10463c5fc6d9e786ab7c648d99f7450f9a25906 after being
reverted in 110a49f69f29fed844d8743b76fd748f4a14812a. This new version
skips the mslookup_client_mdns test if multicast is not supported in the
build environment. I have verified that it doesn't break the build
anymore in my own OBS namespace.
Related: OS#4237, OS#4361
Patch-by: osmith, nhofmeyr
Change-Id: I3c340627181b632dd6a0d577aa2ea2a7cd035c0c
Diffstat (limited to 'include/osmocom/mslookup/mdns_msg.h')
-rw-r--r-- | include/osmocom/mslookup/mdns_msg.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/include/osmocom/mslookup/mdns_msg.h b/include/osmocom/mslookup/mdns_msg.h new file mode 100644 index 0000000..ae7dd17 --- /dev/null +++ b/include/osmocom/mslookup/mdns_msg.h @@ -0,0 +1,54 @@ +/* Copyright 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> + * + * All Rights Reserved + * + * 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 + * (at your option) 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, see <http://www.gnu.org/licenses/>. + */ + +#pragma once + +#include <stdint.h> +#include "mdns_rfc.h" + +struct osmo_mdns_record { + struct llist_head list; + enum osmo_mdns_rfc_record_type type; + uint16_t length; + uint8_t *data; +}; + +struct osmo_mdns_msg_request { + uint16_t id; + char *domain; + enum osmo_mdns_rfc_record_type type; +}; + +struct osmo_mdns_msg_answer { + uint16_t id; + char *domain; + /*! list of osmo_mdns_record. */ + struct llist_head records; +}; + +int osmo_mdns_msg_request_encode(void *ctx, struct msgb *msg, const struct osmo_mdns_msg_request *req); +struct osmo_mdns_msg_request *osmo_mdns_msg_request_decode(void *ctx, const uint8_t *data, size_t data_len); + +void osmo_mdns_msg_answer_init(struct osmo_mdns_msg_answer *answer); +int osmo_mdns_msg_answer_encode(void *ctx, struct msgb *msg, const struct osmo_mdns_msg_answer *ans); +struct osmo_mdns_msg_answer *osmo_mdns_msg_answer_decode(void *ctx, const uint8_t *data, size_t data_len); +int osmo_mdns_result_from_answer(struct osmo_mslookup_result *result, const struct osmo_mdns_msg_answer *ans); + +struct osmo_mdns_record *osmo_mdns_record_txt_keyval_encode(void *ctx, const char *key, const char *value_fmt, ...); +int osmo_mdns_record_txt_keyval_decode(const struct osmo_mdns_record *rec, + char *key_buf, size_t key_size, char *value_buf, size_t value_size); |