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dns_utils: const compatibility with older libunbound

Browse Source 
https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=515
This commit is contained in:
moneromooo-monero 2016-02-21 14:15:53 +00:00
parent 3860feecb8
commit 283894d8ff
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1 changed files with 16 additions and 22 deletions
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38
src/common/dns_utils.cpp
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@ -181,6 +181,17 @@ struct DNSResolverData
ub_ctx* m_ub_context;
};
// 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
class string_copy {
public:
string_copy(const char *s): str(strdup(s)) {}
~string_copy() { free(str); }
operator char*() { return str; }
public:
char *str;
};
DNSResolver::DNSResolver() : m_data(new DNSResolverData())
{
int use_dns_public = 0;
@ -201,9 +212,9 @@ DNSResolver::DNSResolver() : m_data(new DNSResolverData())
if (use_dns_public)
{
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");
ub_ctx_set_fwd(m_data->m_ub_context, string_copy(dns_public_addr));
ub_ctx_set_option(m_data->m_ub_context, string_copy("do-udp:"), string_copy("no"));
ub_ctx_set_option(m_data->m_ub_context, string_copy("do-tcp:"), string_copy("yes"));
}
else {
// look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
@ -211,24 +222,7 @@ DNSResolver::DNSResolver() : m_data(new DNSResolverData())
ub_ctx_hosts(m_data->m_ub_context, NULL);
}
#ifdef DEVELOPER_LIBUNBOUND_OLD
#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
char * ds_copy = NULL; // this will be the writable copy of string that bugged version of libunbound requires
try {
char * ds_copy = strdup( ::get_builtin_ds() );
ub_ctx_add_ta(m_data->m_ub_context, ds_copy);
} catch(...) { // probably not needed but to work correctly in every case...
if (ds_copy) { free(ds_copy); ds_copy=NULL; } // for the strdup
throw ;
}
if (ds_copy) { free(ds_copy); ds_copy=NULL; } // for the strdup
}
#else
// normal version for fixed libunbound
ub_ctx_add_ta(m_data->m_ub_context, ::get_builtin_ds() );
#endif
ub_ctx_add_ta(m_data->m_ub_context, string_copy(::get_builtin_ds()));
}
DNSResolver::~DNSResolver()
@ -258,7 +252,7 @@ std::vector<std::string> DNSResolver::get_record(const std::string& url, int rec
ub_result_ptr result;
// call DNS resolver, blocking. if return value not zero, something went wrong
if (!ub_resolve(m_data->m_ub_context, url.c_str(), record_type, DNS_CLASS_IN, &result))
if (!ub_resolve(m_data->m_ub_context, string_copy(url.c_str()), record_type, DNS_CLASS_IN, &result))
{
dnssec_available = (result->secure || (!result->secure && result->bogus));
dnssec_valid = result->secure && !result->bogus;