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3a9f267983
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 off10463c5fcafter being reverted in110a49f69f. 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
55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
/* Copyright 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdint.h>
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#include "mdns_rfc.h"
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struct osmo_mdns_record {
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struct llist_head list;
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enum osmo_mdns_rfc_record_type type;
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uint16_t length;
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uint8_t *data;
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};
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struct osmo_mdns_msg_request {
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uint16_t id;
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char *domain;
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enum osmo_mdns_rfc_record_type type;
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};
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struct osmo_mdns_msg_answer {
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uint16_t id;
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char *domain;
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/*! list of osmo_mdns_record. */
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struct llist_head records;
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};
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int osmo_mdns_msg_request_encode(void *ctx, struct msgb *msg, const struct osmo_mdns_msg_request *req);
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struct osmo_mdns_msg_request *osmo_mdns_msg_request_decode(void *ctx, const uint8_t *data, size_t data_len);
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void osmo_mdns_msg_answer_init(struct osmo_mdns_msg_answer *answer);
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int osmo_mdns_msg_answer_encode(void *ctx, struct msgb *msg, const struct osmo_mdns_msg_answer *ans);
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struct osmo_mdns_msg_answer *osmo_mdns_msg_answer_decode(void *ctx, const uint8_t *data, size_t data_len);
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int osmo_mdns_result_from_answer(struct osmo_mslookup_result *result, const struct osmo_mdns_msg_answer *ans);
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struct osmo_mdns_record *osmo_mdns_record_txt_keyval_encode(void *ctx, const char *key, const char *value_fmt, ...);
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int osmo_mdns_record_txt_keyval_decode(const struct osmo_mdns_record *rec,
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char *key_buf, size_t key_size, char *value_buf, size_t value_size);
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