1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/* 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 Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <osmocom/mslookup/mslookup.h>
#include <osmocom/mslookup/mdns.h>
#include <osmocom/hlr/logging.h>
#include <osmocom/hlr/hlr.h>
#include <osmocom/hlr/mslookup_server.h>
#include <osmocom/hlr/mslookup_server_mdns.h>
static void osmo_mslookup_server_mdns_tx(struct osmo_mslookup_server_mdns *server,
uint16_t packet_id,
const struct osmo_mslookup_query *query,
const struct osmo_mslookup_result *result)
{
struct msgb *msg;
const char *errmsg = NULL;
void *ctx = talloc_named_const(server, 0, __func__);
msg = osmo_mdns_result_encode(ctx, packet_id, query, result, server->domain_suffix);
if (!msg)
errmsg = "Error encoding mDNS answer packet";
else if (osmo_mdns_sock_send(server->sock, msg))
errmsg = "Error sending mDNS answer";
if (errmsg)
LOGP(DMSLOOKUP, LOGL_ERROR, "%s: mDNS: %s\n", osmo_mslookup_result_name_c(ctx, query, result), errmsg);
talloc_free(ctx);
}
static void osmo_mslookup_server_mdns_handle_request(uint16_t packet_id,
struct osmo_mslookup_server_mdns *server,
const struct osmo_mslookup_query *query)
{
struct osmo_mslookup_result result;
mslookup_server_rx(query, &result);
/* Error logging already happens in mslookup_server_rx() */
if (result.rc != OSMO_MSLOOKUP_RC_RESULT)
return;
osmo_mslookup_server_mdns_tx(server, packet_id, query, &result);
}
static int osmo_mslookup_server_mdns_rx(struct osmo_fd *osmo_fd, unsigned int what)
{
struct osmo_mslookup_server_mdns *server = osmo_fd->data;
struct osmo_mslookup_query *query;
uint16_t packet_id;
int n;
uint8_t buffer[1024];
void *ctx;
/* Parse the message and print it */
n = read(osmo_fd->fd, buffer, sizeof(buffer));
if (n <= 0)
return n;
ctx = talloc_named_const(server, 0, __func__);
query = osmo_mdns_query_decode(ctx, buffer, n, &packet_id, server->domain_suffix);
if (!query) {
talloc_free(ctx);
return -1;
}
osmo_mslookup_id_name_buf((char *)buffer, sizeof(buffer), &query->id);
LOGP(DMSLOOKUP, LOGL_DEBUG, "mDNS rx request: %s.%s\n", query->service, buffer);
osmo_mslookup_server_mdns_handle_request(packet_id, server, query);
talloc_free(ctx);
return n;
}
struct osmo_mslookup_server_mdns *osmo_mslookup_server_mdns_start(void *ctx, const struct osmo_sockaddr_str *bind_addr,
const char *domain_suffix)
{
struct osmo_mslookup_server_mdns *server = talloc_zero(ctx, struct osmo_mslookup_server_mdns);
OSMO_ASSERT(server);
*server = (struct osmo_mslookup_server_mdns){
.bind_addr = *bind_addr,
.domain_suffix = talloc_strdup(server, domain_suffix)
};
server->sock = osmo_mdns_sock_init(server,
bind_addr->ip, bind_addr->port,
osmo_mslookup_server_mdns_rx,
server, 0);
if (!server->sock) {
LOGP(DMSLOOKUP, LOGL_ERROR,
"mslookup mDNS server: error initializing multicast bind on " OSMO_SOCKADDR_STR_FMT "\n",
OSMO_SOCKADDR_STR_FMT_ARGS(bind_addr));
talloc_free(server);
return NULL;
}
return server;
}
void osmo_mslookup_server_mdns_stop(struct osmo_mslookup_server_mdns *server)
{
if (!server)
return;
osmo_mdns_sock_cleanup(server->sock);
talloc_free(server);
}
void mslookup_server_mdns_config_apply()
{
/* Check whether to start/stop/restart mDNS server */
bool should_run;
bool should_stop;
should_run = g_hlr->mslookup.allow_startup
&& g_hlr->mslookup.server.enable && g_hlr->mslookup.server.mdns.enable;
should_stop = g_hlr->mslookup.server.mdns.running
&& (!should_run
|| osmo_sockaddr_str_cmp(&g_hlr->mslookup.server.mdns.bind_addr,
&g_hlr->mslookup.server.mdns.running->bind_addr)
|| strcmp(g_hlr->mslookup.server.mdns.domain_suffix,
g_hlr->mslookup.server.mdns.running->domain_suffix));
if (should_stop) {
osmo_mslookup_server_mdns_stop(g_hlr->mslookup.server.mdns.running);
g_hlr->mslookup.server.mdns.running = NULL;
LOGP(DMSLOOKUP, LOGL_NOTICE, "Stopped mslookup mDNS server\n");
}
if (should_run && !g_hlr->mslookup.server.mdns.running) {
g_hlr->mslookup.server.mdns.running =
osmo_mslookup_server_mdns_start(g_hlr, &g_hlr->mslookup.server.mdns.bind_addr,
g_hlr->mslookup.server.mdns.domain_suffix);
if (!g_hlr->mslookup.server.mdns.running)
LOGP(DMSLOOKUP, LOGL_ERROR, "Failed to start mslookup mDNS server on " OSMO_SOCKADDR_STR_FMT "\n",
OSMO_SOCKADDR_STR_FMT_ARGS(&g_hlr->mslookup.server.mdns.bind_addr));
else
LOGP(DMSLOOKUP, LOGL_NOTICE, "Started mslookup mDNS server, receiving mDNS requests at multicast "
OSMO_SOCKADDR_STR_FMT "\n",
OSMO_SOCKADDR_STR_FMT_ARGS(&g_hlr->mslookup.server.mdns.running->bind_addr));
}
}
|
