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dns_utils: simpify smart pointer use, and use for url strings too

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OK, I admit I wanted to template this struct for fun too.
This commit is contained in:
moneromooo-monero 2015-06-07 16:57:01 +01:00
parent 5df550d276
commit a9b1f7eb05
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GPG key ID: 686F07454D6CEFC3
2 changed files with 46 additions and 39 deletions
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83
src/common/dns_utils.cpp
View file

@ -138,20 +138,35 @@ std::string ipv6_to_string(const char* src)
// custom smart pointer. // custom smart pointer.
// TODO: see if std::auto_ptr and the like support custom destructors // TODO: see if std::auto_ptr and the like support custom destructors
class ub_result_ptr template<typename type, void (*freefunc)(type*)>
class scoped_ptr
{ {
public: public:
ub_result_ptr() scoped_ptr():
ptr(nullptr)
{ {
ptr = nullptr;
} }
~ub_result_ptr() scoped_ptr(type *p):
ptr(p)
{ {
ub_resolve_free(ptr);
} }
ub_result* ptr; ~scoped_ptr()
{
freefunc(ptr);
}
operator type *() { return ptr; }
type **operator &() { return &ptr; }
type *operator->() { return ptr; }
operator const type*() const { return &ptr; }
private:
type* ptr;
}; };
typedef class scoped_ptr<ub_result,ub_resolve_free> ub_result_ptr;
static void freestring(char *ptr) { free(ptr); }
typedef class scoped_ptr<char,freestring> string_ptr;
struct DNSResolverData struct DNSResolverData
{ {
ub_ctx* m_ub_context; ub_ctx* m_ub_context;
@ -203,10 +218,8 @@ std::vector<std::string> DNSResolver::get_ipv4(const std::string& url, bool& dns
std::vector<std::string> addresses; std::vector<std::string> addresses;
dnssec_available = false; dnssec_available = false;
dnssec_valid = false; dnssec_valid = false;
char urlC[1000]; // waaaay too big, but just in case...
strncpy(urlC, url.c_str(), 999); string_ptr urlC(strdup(url.c_str()));
urlC[999] = '\0';
if (!check_address_syntax(urlC)) if (!check_address_syntax(urlC))
{ {
return addresses; return addresses;
@ -216,15 +229,15 @@ std::vector<std::string> DNSResolver::get_ipv4(const std::string& url, bool& dns
ub_result_ptr result; ub_result_ptr result;
// call DNS resolver, blocking. if return value not zero, something went wrong // call DNS resolver, blocking. if return value not zero, something went wrong
if (!ub_resolve(m_data->m_ub_context, urlC, DNS_TYPE_A, DNS_CLASS_IN, &(result.ptr))) if (!ub_resolve(m_data->m_ub_context, urlC, DNS_TYPE_A, DNS_CLASS_IN, &result))
{ {
dnssec_available = (result.ptr->secure || (!result.ptr->secure && result.ptr->bogus)); dnssec_available = (result->secure || (!result->secure && result->bogus));
dnssec_valid = !result.ptr->bogus; dnssec_valid = !result->bogus;
if (result.ptr->havedata) if (result->havedata)
{ {
for (size_t i=0; result.ptr->data[i] != NULL; i++) for (size_t i=0; result->data[i] != NULL; i++)
{ {
addresses.push_back(ipv4_to_string(result.ptr->data[i])); addresses.push_back(ipv4_to_string(result->data[i]));
} }
} }
} }
@ -237,11 +250,8 @@ std::vector<std::string> DNSResolver::get_ipv6(const std::string& url, bool& dns
std::vector<std::string> addresses; std::vector<std::string> addresses;
dnssec_available = false; dnssec_available = false;
dnssec_valid = false; dnssec_valid = false;
char urlC[1000]; // waaaay too big, but just in case...
strncpy(urlC, url.c_str(), 999);
urlC[999] = '\0';
string_ptr urlC(strdup(url.c_str()));
if (!check_address_syntax(urlC)) if (!check_address_syntax(urlC))
{ {
return addresses; return addresses;
@ -250,15 +260,15 @@ std::vector<std::string> DNSResolver::get_ipv6(const std::string& url, bool& dns
ub_result_ptr result; ub_result_ptr result;
// call DNS resolver, blocking. if return value not zero, something went wrong // call DNS resolver, blocking. if return value not zero, something went wrong
if (!ub_resolve(m_data->m_ub_context, urlC, DNS_TYPE_AAAA, DNS_CLASS_IN, &(result.ptr))) if (!ub_resolve(m_data->m_ub_context, urlC, DNS_TYPE_AAAA, DNS_CLASS_IN, &result))
{ {
dnssec_available = (result.ptr->secure || (!result.ptr->secure && result.ptr->bogus)); dnssec_available = (result->secure || (!result->secure && result->bogus));
dnssec_valid = !result.ptr->bogus; dnssec_valid = !result->bogus;
if (result.ptr->havedata) if (result->havedata)
{ {
for (size_t i=0; result.ptr->data[i] != NULL; i++) for (size_t i=0; result->data[i] != NULL; i++)
{ {
addresses.push_back(ipv6_to_string(result.ptr->data[i])); addresses.push_back(ipv6_to_string(result->data[i]));
} }
} }
} }
@ -271,11 +281,8 @@ std::vector<std::string> DNSResolver::get_txt_record(const std::string& url, boo
std::vector<std::string> records; std::vector<std::string> records;
dnssec_available = false; dnssec_available = false;
dnssec_valid = false; dnssec_valid = false;
char urlC[1000]; // waaaay too big, but just in case...
strncpy(urlC, url.c_str(), 999);
urlC[999] = '\0';
string_ptr urlC(strdup(url.c_str()));
if (!check_address_syntax(urlC)) if (!check_address_syntax(urlC))
{ {
return records; return records;
@ -284,18 +291,18 @@ std::vector<std::string> DNSResolver::get_txt_record(const std::string& url, boo
ub_result_ptr result; ub_result_ptr result;
// call DNS resolver, blocking. if return value not zero, something went wrong // call DNS resolver, blocking. if return value not zero, something went wrong
if (!ub_resolve(m_data->m_ub_context, urlC, DNS_TYPE_TXT, DNS_CLASS_IN, &(result.ptr))) if (!ub_resolve(m_data->m_ub_context, urlC, DNS_TYPE_TXT, DNS_CLASS_IN, &result))
{ {
dnssec_available = (result.ptr->secure || (!result.ptr->secure && result.ptr->bogus)); dnssec_available = (result->secure || (!result->secure && result->bogus));
dnssec_valid = !result.ptr->bogus; dnssec_valid = !result->bogus;
if (result.ptr->havedata) if (result->havedata)
{ {
for (size_t i=0; result.ptr->data[i] != NULL; i++) for (size_t i=0; result->data[i] != NULL; i++)
{ {
// plz fix this, but this does NOT work and spills over into parts of memory it shouldn't: records.push_back(result.ptr->data[i]); // plz fix this, but this does NOT work and spills over into parts of memory it shouldn't: records.push_back(result.ptr->data[i]);
char *restxt; char *restxt;
restxt = (char*) calloc(result.ptr->len[i]+1, 1); restxt = (char*) calloc(result->len[i]+1, 1);
memcpy(restxt, result.ptr->data[i]+1, result.ptr->len[i]-1); memcpy(restxt, result->data[i]+1, result->len[i]-1);
records.push_back(restxt); records.push_back(restxt);
} }
} }
@ -327,10 +334,10 @@ DNSResolver& DNSResolver::instance()
return *staticInstance; return *staticInstance;
} }
bool DNSResolver::check_address_syntax(const std::string& addr) bool DNSResolver::check_address_syntax(const char *addr)
{ {
// if string doesn't contain a dot, we won't consider it a url for now. // if string doesn't contain a dot, we won't consider it a url for now.
if (addr.find(".") == std::string::npos) if (strchr(addr,'.') == NULL)
{ {
return false; return false;
} }

2
src/common/dns_utils.h
View file

@ -128,7 +128,7 @@ private:
* *
* @return true if it looks enough like a URL, false if not * @return true if it looks enough like a URL, false if not
*/ */
bool check_address_syntax(const std::string& addr); bool check_address_syntax(const char *addr);
DNSResolverData *m_data; DNSResolverData *m_data;
}; // class DNSResolver }; // class DNSResolver