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ce77feec PL |
1 | /* |
2 | * Embedded dns-sd client. This file is part of Shairport. | |
3 | * Copyright (c) Paul Lietar 2013 | |
4 | * All rights reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person | |
7 | * obtaining a copy of this software and associated documentation | |
8 | * files (the "Software"), to deal in the Software without | |
9 | * restriction, including without limitation the rights to use, | |
10 | * copy, modify, merge, publish, distribute, sublicense, and/or | |
11 | * sell copies of the Software, and to permit persons to whom the | |
12 | * Software is furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be | |
15 | * included in all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
18 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
19 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
20 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
21 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
22 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
23 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
24 | * OTHER DEALINGS IN THE SOFTWARE. | |
25 | */ | |
26 | ||
c8b0be30 | 27 | #include "common.h" |
54d761ff | 28 | #include "mdns.h" |
064bd293 MB |
29 | #include <arpa/inet.h> |
30 | #include <dns_sd.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
ce77feec PL |
33 | |
34 | static DNSServiceRef service; | |
35 | ||
54e228cb MB |
36 | static int mdns_dns_sd_register(char *ap1name, __attribute__((unused)) char *ap2name, int port, |
37 | __attribute__((unused)) char **txt_records, | |
38 | __attribute__((unused)) char **secondary_txt_records) { | |
49371cb9 | 39 | char *recordwithoutmetadata[] = {MDNS_RECORD_WITHOUT_METADATA, NULL}; |
75f3f912 | 40 | #ifdef CONFIG_METADATA |
49371cb9 | 41 | char *recordwithmetadata[] = {MDNS_RECORD_WITH_METADATA, NULL}; |
87a0475c MB |
42 | #endif |
43 | char **record; | |
75f3f912 | 44 | #ifdef CONFIG_METADATA |
6ae067af | 45 | if (config.metadata_enabled) |
87a0475c MB |
46 | record = recordwithmetadata; |
47 | else | |
75f3f912 | 48 | #endif |
87a0475c | 49 | record = recordwithoutmetadata; |
ce77feec | 50 | |
87a0475c | 51 | uint16_t length = 0; |
49371cb9 | 52 | char **field; |
ce77feec | 53 | |
87a0475c | 54 | // Concatenate string contained i record into buf. |
ce77feec | 55 | |
87a0475c MB |
56 | for (field = record; *field; field++) { |
57 | length += strlen(*field) + 1; // One byte for length each time | |
58 | } | |
ce77feec | 59 | |
87a0475c MB |
60 | char *buf = malloc(length * sizeof(char)); |
61 | if (buf == NULL) { | |
62 | warn("dns_sd: buffer record allocation failed"); | |
63 | return -1; | |
64 | } | |
ce77feec | 65 | |
87a0475c | 66 | char *p = buf; |
ce77feec | 67 | |
87a0475c MB |
68 | for (field = record; *field; field++) { |
69 | char *newp = stpcpy(p + 1, *field); | |
70 | *p = newp - p - 1; | |
71 | p = newp; | |
72 | } | |
ce77feec | 73 | |
87a0475c | 74 | DNSServiceErrorType error; |
54e228cb | 75 | error = DNSServiceRegister(&service, 0, kDNSServiceInterfaceIndexAny, ap1name, config.regtype, "", |
87a0475c | 76 | NULL, htons((uint16_t)port), length, buf, NULL, NULL); |
ce77feec | 77 | |
87a0475c | 78 | free(buf); |
ce77feec | 79 | |
87a0475c MB |
80 | if (error == kDNSServiceErr_NoError) |
81 | return 0; | |
82 | else { | |
83 | warn("dns-sd: DNSServiceRegister error %d", error); | |
84 | return -1; | |
85 | } | |
ce77feec PL |
86 | } |
87 | ||
88 | static void mdns_dns_sd_unregister(void) { | |
87a0475c MB |
89 | if (service) { |
90 | DNSServiceRefDeallocate(service); | |
91 | service = NULL; | |
92 | } | |
ce77feec PL |
93 | } |
94 | ||
87a0475c MB |
95 | mdns_backend mdns_dns_sd = {.name = "dns-sd", |
96 | .mdns_register = mdns_dns_sd_register, | |
139c18bf | 97 | .mdns_unregister = mdns_dns_sd_unregister, |
72079ada MB |
98 | .mdns_dacp_monitor_start = NULL, |
99 | .mdns_dacp_monitor_set_id = NULL, | |
100 | .mdns_dacp_monitor_stop = NULL}; |