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b76e0659 | 1 | /* libresolv interfaces for internal use across glibc. |
04277e02 | 2 | Copyright (C) 2016-2019 Free Software Foundation, Inc. |
b76e0659 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef _RESOLV_INTERNAL_H | |
20 | #define _RESOLV_INTERNAL_H 1 | |
21 | ||
22 | #include <resolv.h> | |
23 | #include <stdbool.h> | |
24 | ||
a7ff1da8 FW |
25 | /* Resolver flags. Used for _flags in struct __res_state. */ |
26 | #define RES_F_VC 0x00000001 /* Socket is TCP. */ | |
27 | #define RES_F_CONN 0x00000002 /* Socket is connected. */ | |
28 | #define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors. */ | |
29 | ||
30 | ||
b76e0659 FW |
31 | /* Internal version of RES_USE_INET6 which does not trigger a |
32 | deprecation warning. */ | |
33 | #define DEPRECATED_RES_USE_INET6 0x00002000 | |
34 | ||
35 | static inline bool | |
36 | res_use_inet6 (void) | |
37 | { | |
38 | return _res.options & DEPRECATED_RES_USE_INET6; | |
39 | } | |
40 | ||
e14a2772 FW |
41 | enum |
42 | { | |
43 | /* The advertized EDNS buffer size. The value 1200 is derived | |
44 | from the IPv6 minimum MTU (1280 bytes) minus some arbitrary | |
45 | space for tunneling overhead. If the DNS server does not react | |
46 | to ICMP Fragmentation Needed But DF Set messages, this should | |
47 | avoid all UDP fragments on current networks. Avoiding UDP | |
48 | fragments is desirable because it prevents fragmentation-based | |
49 | spoofing attacks because the randomness in a DNS packet is | |
50 | concentrated in the first fragment (with the headers) and does | |
51 | not protect subsequent fragments. */ | |
52 | RESOLV_EDNS_BUFFER_SIZE = 1200, | |
53 | }; | |
54 | ||
352f4ff9 FW |
55 | struct resolv_context; |
56 | ||
57 | /* Internal function for implementing res_nmkquery and res_mkquery. | |
58 | Also used by __res_context_query. */ | |
59 | int __res_context_mkquery (struct resolv_context *, int op, const char *dname, | |
60 | int class, int type, const unsigned char *data, | |
61 | unsigned char *buf, int buflen) attribute_hidden; | |
62 | ||
63 | /* Main resolver query function for use within glibc. */ | |
64 | int __res_context_search (struct resolv_context *, const char *, int, int, | |
65 | unsigned char *, int, unsigned char **, | |
66 | unsigned char **, int *, int *, int *); | |
67 | libresolv_hidden_proto (__res_context_search) | |
68 | ||
69 | /* Main resolver query function for use within glibc. */ | |
70 | int __res_context_query (struct resolv_context *, const char *, int, int, | |
71 | unsigned char *, int, unsigned char **, | |
72 | unsigned char **, int *, int *, int *); | |
73 | libresolv_hidden_proto (__res_context_query) | |
74 | ||
75 | /* Internal function used to implement the query and search | |
76 | functions. */ | |
77 | int __res_context_send (struct resolv_context *, const unsigned char *, int, | |
78 | const unsigned char *, int, unsigned char *, | |
79 | int, unsigned char **, unsigned char **, | |
80 | int *, int *, int *) attribute_hidden; | |
81 | ||
82 | /* Internal function similar to res_hostalias. */ | |
83 | const char *__res_context_hostalias (struct resolv_context *, | |
84 | const char *, char *, size_t); | |
85 | libresolv_hidden_proto (__res_context_hostalias); | |
86 | ||
e14a2772 | 87 | /* Add an OPT record to a DNS query. */ |
352f4ff9 FW |
88 | int __res_nopt (struct resolv_context *, int n0, |
89 | unsigned char *buf, int buflen, int anslen) attribute_hidden; | |
e14a2772 | 90 | |
60149b28 FW |
91 | /* Convert from presentation format (which usually means ASCII |
92 | printable) to network format (which is usually some kind of binary | |
93 | format). The input is in the range [SRC, SRC + SRCLEN). The | |
94 | output is written to DST (which has to be 4 or 16 bytes long, | |
95 | depending on AF). Return 0 for invalid input, 1 for success, -1 | |
96 | for an invalid address family. */ | |
97 | int __inet_pton_length (int af, const char *src, size_t srclen, void *); | |
98 | libc_hidden_proto (__inet_pton_length) | |
99 | ||
124e0258 FW |
100 | /* Called as part of the thread shutdown sequence. */ |
101 | void __res_thread_freeres (void) attribute_hidden; | |
102 | ||
08504de7 FW |
103 | /* The Linux kernel does not enable all ICMP messages on a UDP socket |
104 | by default. A call this function enables full error reporting for | |
105 | the socket FD. FAMILY must be AF_INET or AF_INET6. Returns 0 on | |
106 | success, -1 on failure. */ | |
107 | int __res_enable_icmp (int family, int fd) attribute_hidden; | |
108 | ||
b76e0659 | 109 | #endif /* _RESOLV_INTERNAL_H */ |