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Added function to check syntax of URL for DNS lookup

Browse source 
For now, simply checks for '.' character, but that will be easy to
change in the future if necessary/desired.
This commit is contained in:
Thomas Winget 2014-09-18 09:07:46 -04:00 committed by Riccardo Spagni
parent 24f325a33d
commit 1dece111cc
2 changed files with 44 additions and 8 deletions
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43
src/common/dns_utils.cpp
View file

@ -79,11 +79,16 @@ DNSResolver::~DNSResolver()
std::vector<std::string> DNSResolver::get_ipv4(const std::string& url)
{
std::vector<std::string> addresses;
if (!check_address_syntax(url))
{
return addresses;
}
// destructor takes care of cleanup
ub_result_ptr result;
std::vector<std::string> retval;
// call DNS resolver, blocking. if return value not zero, something went wrong
if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_A, LDNS_RR_CLASS_IN, &(result.ptr)))
{
@ -96,19 +101,25 @@ std::vector<std::string> DNSResolver::get_ipv4(const std::string& url)
// convert bytes to string, append if no error
if (inet_ntop(AF_INET, result.ptr->data[i], as_str, sizeof(as_str)))
{
retval.push_back(as_str);
addresses.push_back(as_str);
}
}
}
}
return retval;
return addresses;
}
std::vector<std::string> DNSResolver::get_ipv6(const std::string& url)
{
std::vector<std::string> addresses;
if (!check_address_syntax(url))
{
return addresses;
}
ub_result_ptr result;
std::vector<std::string> retval;
// call DNS resolver, blocking. if return value not zero, something went wrong
if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_AAAA, LDNS_RR_CLASS_IN, &(result.ptr)))
@ -122,20 +133,26 @@ std::vector<std::string> DNSResolver::get_ipv6(const std::string& url)
// convert bytes to string, append if no error
if (inet_ntop(AF_INET6, result.ptr->data[i], as_str, sizeof(as_str)))
{
retval.push_back(as_str);
addresses.push_back(as_str);
}
}
}
}
return retval;
return addresses;
}
std::vector<std::string> DNSResolver::get_txt_record(const std::string& url)
{
ub_result_ptr result;
std::vector<std::string> records;
if (!check_address_syntax(url))
{
return records;
}
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(), LDNS_RR_TYPE_TXT, LDNS_RR_CLASS_IN, &(result.ptr)))
{
@ -161,4 +178,14 @@ DNSResolver& DNSResolver::instance()
return *staticInstance;
}
bool DNSResolver::check_address_syntax(const std::string& addr)
{
// if string doesn't contain a dot, we won't consider it a url for now.
if (addr.find(".") == std::string::npos)
{
return false;
}
return true;
}
} // namespace tools

9
src/common/dns_utils.h
View file

@ -101,6 +101,15 @@ public:
private:
/**
* @brief Checks a string to see if it looks like a URL
*
* @param addr the string to be checked
*
* @return true if it looks enough like a URL, false if not
*/
bool check_address_syntax(const std::string& addr);
DNSResolverData *m_data;
}; // class DNSResolver