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Merge pull request #541

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5131b26 Replace tabs and remove trailing whitespace (warptangent)
0d40de4 Optionally restrict DNS queries to TCP (warptangent)
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Riccardo Spagni 2015-12-16 22:59:10 +02:00
commit f7d41d6e28
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1 changed files with 48 additions and 27 deletions
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75
src/common/dns_utils.cpp
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@ -1,21 +1,21 @@
// Copyright (c) 2014-2015, The Monero Project // Copyright (c) 2014-2015, The Monero Project
// //
// All rights reserved. // All rights reserved.
// //
// Redistribution and use in source and binary forms, with or without modification, are // Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met: // permitted provided that the following conditions are met:
// //
// 1. Redistributions of source code must retain the above copyright notice, this list of // 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer. // conditions and the following disclaimer.
// //
// 2. Redistributions in binary form must reproduce the above copyright notice, this list // 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other // of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution. // materials provided with the distribution.
// //
// 3. Neither the name of the copyright holder nor the names of its contributors may be // 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific // used to endorse or promote products derived from this software without specific
// prior written permission. // prior written permission.
// //
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
@ -86,7 +86,7 @@ get_builtin_cert(void)
static const char* static const char*
get_builtin_ds(void) get_builtin_ds(void)
{ {
return return
". IN DS 19036 8 2 49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5\n"; ". IN DS 19036 8 2 49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5\n";
} }
@ -183,30 +183,51 @@ struct DNSResolverData
DNSResolver::DNSResolver() : m_data(new DNSResolverData()) DNSResolver::DNSResolver() : m_data(new DNSResolverData())
{ {
int use_dns_public = 0;
const char* dns_public_addr = "8.8.4.4";
if (auto res = getenv("DNS_PUBLIC"))
{
std::string dns_public(res);
// TODO: could allow parsing of IP and protocol: e.g. DNS_PUBLIC=tcp:8.8.8.8
if (dns_public == "tcp")
{
LOG_PRINT_L0("Using public DNS server: " << dns_public_addr << " (TCP)");
use_dns_public = 1;
}
}
// init libunbound context // init libunbound context
m_data->m_ub_context = ub_ctx_create(); m_data->m_ub_context = ub_ctx_create();
// look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent if (use_dns_public)
ub_ctx_resolvconf(m_data->m_ub_context, NULL); {
ub_ctx_hosts(m_data->m_ub_context, NULL); ub_ctx_set_fwd(m_data->m_ub_context, dns_public_addr);
ub_ctx_set_option(m_data->m_ub_context, "do-udp:", "no");
ub_ctx_set_option(m_data->m_ub_context, "do-tcp:", "yes");
}
else {
// look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
ub_ctx_resolvconf(m_data->m_ub_context, NULL);
ub_ctx_hosts(m_data->m_ub_context, NULL);
}
#ifdef DEVELOPER_LIBUNBOUND_OLD #ifdef DEVELOPER_LIBUNBOUND_OLD
#pragma message "Using the work around for old libunbound" #pragma message "Using the work around for old libunbound"
{ // work around for bug https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=515 needed for it to compile on e.g. Debian 7 { // work around for bug https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=515 needed for it to compile on e.g. Debian 7
char * ds_copy = NULL; // this will be the writable copy of string that bugged version of libunbound requires char * ds_copy = NULL; // this will be the writable copy of string that bugged version of libunbound requires
try { try {
char * ds_copy = strdup( ::get_builtin_ds() ); char * ds_copy = strdup( ::get_builtin_ds() );
ub_ctx_add_ta(m_data->m_ub_context, ds_copy); ub_ctx_add_ta(m_data->m_ub_context, ds_copy);
} catch(...) { // probably not needed but to work correctly in every case... } catch(...) { // probably not needed but to work correctly in every case...
if (ds_copy) { free(ds_copy); ds_copy=NULL; } // for the strdup if (ds_copy) { free(ds_copy); ds_copy=NULL; } // for the strdup
throw ; throw ;
} }
if (ds_copy) { free(ds_copy); ds_copy=NULL; } // for the strdup if (ds_copy) { free(ds_copy); ds_copy=NULL; } // for the strdup
} }
#else #else
// normal version for fixed libunbound // normal version for fixed libunbound
ub_ctx_add_ta(m_data->m_ub_context, ::get_builtin_ds() ); ub_ctx_add_ta(m_data->m_ub_context, ::get_builtin_ds() );
#endif #endif
} }