| 1 | /* $Id: resolv_conf_parser.h 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * resolv_conf_parser.h - interface to parser of resolv.conf resolver(5)
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2014-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 | #ifndef __RESOLV_CONF_PARSER_H__
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| 29 | #define __RESOLV_CONF_PARSER_H__
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| 30 |
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| 31 | #include <iprt/cdefs.h>
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| 32 | #include <iprt/net.h>
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| 33 |
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| 34 | RT_C_DECLS_BEGIN
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| 35 |
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| 36 | #define RCPS_MAX_NAMESERVERS 3
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| 37 | #define RCPS_MAX_SEARCHLIST 10
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| 38 | #define RCPS_BUFFER_SIZE 256
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| 39 | #define RCPS_IPVX_SIZE 47
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| 40 |
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| 41 | /**
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| 42 | * RESOLV_CONF_FILE can be defined in external tests for verification of Slirp behaviour.
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| 43 | */
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| 44 | #ifndef RESOLV_CONF_FILE
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| 45 | # ifndef RT_OS_OS2
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| 46 | # define RESOLV_CONF_FILE "/etc/resolv.conf"
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| 47 | # else
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| 48 | # define RESOLV_CONF_FILE "\\MPTN\\ETC\\RESOLV2"
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| 49 | # endif
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| 50 | #endif
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| 51 |
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| 52 | /**
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| 53 | * In Slirp we don't need IPv6 for general case (only for dnsproxy mode
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| 54 | * it's potentially acceptable)
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| 55 | */
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| 56 | #define RCPSF_IGNORE_IPV6 RT_BIT(0)
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| 57 |
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| 58 | /**
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| 59 | * This flag used to request just the strings in rcps_str_nameserver,
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| 60 | * but no addresses in rcps_nameserver. This is not very useful,
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| 61 | * since we need to validate addresses anyway. This flag is ignored
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| 62 | * now.
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| 63 | */
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| 64 | #define RCPSF_NO_STR2IPCONV RT_BIT(1)
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| 65 |
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| 66 |
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| 67 | struct rcp_state
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| 68 | {
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| 69 | uint16_t rcps_port;
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| 70 | /**
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| 71 | * Filling of this array ommited iff RCPSF_NO_STR2IPCONF in rcp_state::rcps_flags set.
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| 72 | */
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| 73 | RTNETADDR rcps_nameserver[RCPS_MAX_NAMESERVERS];
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| 74 | /**
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| 75 | * this array contains non-NULL (pointing to rcp_state::rcps_nameserver_str_buffer) iff
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| 76 | * RCPSF_NO_STR2IPCONF in rcp_state::rcps_flags set.
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| 77 | */
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| 78 | char *rcps_str_nameserver[RCPS_MAX_NAMESERVERS];
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| 79 | unsigned rcps_num_nameserver;
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| 80 | /**
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| 81 | * Shortcuts to storage, note that domain is optional
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| 82 | * and if it's missed in resolv.conf rcps_domain should be equal
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| 83 | * to rcps_search_list[0]
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| 84 | */
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| 85 | char *rcps_domain;
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| 86 | char *rcps_searchlist[RCPS_MAX_SEARCHLIST];
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| 87 | unsigned rcps_num_searchlist;
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| 88 |
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| 89 | uint32_t rcps_flags;
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| 90 |
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| 91 | char rcps_domain_buffer[RCPS_BUFFER_SIZE];
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| 92 | char rcps_searchlist_buffer[RCPS_BUFFER_SIZE];
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| 93 | char rcps_nameserver_str_buffer[RCPS_MAX_NAMESERVERS * RCPS_IPVX_SIZE];
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| 94 | };
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| 95 |
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| 96 |
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| 97 | /**
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| 98 | * This function parses specified file (expected to conform resolver (5) Mac OSX or resolv.conf (3) Linux)
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| 99 | * and fills the structure.
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| 100 | * @return 0 - on success
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| 101 | * -1 - on fail.
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| 102 | * <code>
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| 103 | * struct rcp_state state;
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| 104 | * int rc;
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| 105 | *
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| 106 | * rc = rcp_parse(&state, "/etc/resolv.conf");
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| 107 | * for(i = 0; rc == 0 && i != state.rcps_num_nameserver; ++i)
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| 108 | * {
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| 109 | * if ((state.rcps_flags & RCPSF_NO_STR2IPCONV) == 0)
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| 110 | * {
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| 111 | * const RTNETADDR *addr = &state.rcps_nameserver[i];
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| 112 | *
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| 113 | * switch (state.rcps_nameserver[i].enmType)
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| 114 | * {
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| 115 | * case RTNETADDRTYPE_IPV4:
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| 116 | * RTPrintf("nameserver[%d]: [%RTnaipv4]:%d\n", i, addr->uAddr.IPv4, addr->uPort);
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| 117 | * break;
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| 118 | * case RTNETADDRTYPE_IPV6:
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| 119 | * RTPrintf("nameserver[%d]: [%RTnaipv6]:%d\n", i, &addr->uAddr.IPv6, addr->uPort);
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| 120 | * break;
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| 121 | * default:
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| 122 | * break;
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| 123 | * }
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| 124 | * }
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| 125 | * else
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| 126 | * RTPrintf("nameserver[%d]: %s\n", i, state.rcps_str_nameserver[i]);
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| 127 | * }
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| 128 | * </code>
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| 129 | *
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| 130 | */
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| 131 | int rcp_parse(struct rcp_state *, const char *);
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| 132 |
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| 133 | RT_C_DECLS_END
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| 134 |
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| 135 | #endif
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