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ws-api.cc
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/
ws-api.cc
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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <boost/tokenizer.hpp>
#include "namespaces.hh"
#include "ws-api.hh"
#include "json.hh"
#include "version.hh"
#include "arguments.hh"
#include "dnsparser.hh"
#include "responsestats.hh"
#ifndef RECURSOR
#include "statbag.hh"
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <iomanip>
using json11::Json;
extern string s_programname;
extern ResponseStats g_rs;
#ifndef RECURSOR
extern StatBag S;
#endif
#ifndef HAVE_STRCASESTR
/*
* strcasestr() locates the first occurrence in the string s1 of the
* sequence of characters (excluding the terminating null character)
* in the string s2, ignoring case. strcasestr() returns a pointer
* to the located string, or a null pointer if the string is not found.
* If s2 is empty, the function returns s1.
*/
static char *
strcasestr(const char *s1, const char *s2)
{
int *cm = __trans_lower;
const uchar_t *us1 = (const uchar_t *)s1;
const uchar_t *us2 = (const uchar_t *)s2;
const uchar_t *tptr;
int c;
if (us2 == NULL || *us2 == '\0')
return ((char *)us1);
c = cm[*us2];
while (*us1 != '\0') {
if (c == cm[*us1++]) {
tptr = us1;
while (cm[c = *++us2] == cm[*us1++] && c != '\0')
continue;
if (c == '\0')
return ((char *)tptr - 1);
us1 = tptr;
us2 = (const uchar_t *)s2;
c = cm[*us2];
}
}
return (NULL);
}
#endif // HAVE_STRCASESTR
static Json getServerDetail() {
return Json::object {
{ "type", "Server" },
{ "id", "localhost" },
{ "url", "/api/v1/servers/localhost" },
{ "daemon_type", productTypeApiType() },
{ "version", getPDNSVersion() },
{ "config_url", "/api/v1/servers/localhost/config{/config_setting}" },
{ "zones_url", "/api/v1/servers/localhost/zones{/zone}" }
};
}
/* Return information about the supported API versions.
* The format of this MUST NEVER CHANGE at it's not versioned.
*/
void apiDiscovery(HttpRequest* req, HttpResponse* resp) {
if(req->method != "GET")
throw HttpMethodNotAllowedException();
Json version1 = Json::object {
{ "version", 1 },
{ "url", "/api/v1" }
};
Json doc = Json::array { version1 };
resp->setBody(doc);
}
void apiServer(HttpRequest* req, HttpResponse* resp) {
if(req->method != "GET")
throw HttpMethodNotAllowedException();
Json doc = Json::array {getServerDetail()};
resp->setBody(doc);
}
void apiServerDetail(HttpRequest* req, HttpResponse* resp) {
if(req->method != "GET")
throw HttpMethodNotAllowedException();
resp->setBody(getServerDetail());
}
void apiServerConfig(HttpRequest* req, HttpResponse* resp) {
if(req->method != "GET")
throw HttpMethodNotAllowedException();
vector<string> items = ::arg().list();
string value;
Json::array doc;
for(const string& item : items) {
if(item.find("password") != string::npos || item.find("api-key") != string::npos)
value = "***";
else
value = ::arg()[item];
doc.push_back(Json::object {
{ "type", "ConfigSetting" },
{ "name", item },
{ "value", value },
});
}
resp->setBody(doc);
}
void apiServerStatistics(HttpRequest* req, HttpResponse* resp) {
if(req->method != "GET")
throw HttpMethodNotAllowedException();
Json::array doc;
string name = req->getvars["statistic"];
if (!name.empty()) {
auto stat = productServerStatisticsFetch(name);
if (!stat) {
throw ApiException("Unknown statistic name");
}
doc.push_back(Json::object {
{ "type", "StatisticItem" },
{ "name", name },
{ "value", std::to_string(*stat) },
});
resp->setBody(doc);
return;
}
typedef map<string, string> stat_items_t;
stat_items_t general_stats;
productServerStatisticsFetch(general_stats);
for(const auto& item : general_stats) {
doc.push_back(Json::object {
{ "type", "StatisticItem" },
{ "name", item.first },
{ "value", item.second },
});
}
auto resp_qtype_stats = g_rs.getQTypeResponseCounts();
auto resp_size_stats = g_rs.getSizeResponseCounts();
auto resp_rcode_stats = g_rs.getRCodeResponseCounts();
{
Json::array values;
for(const auto& item : resp_qtype_stats) {
if (item.second == 0)
continue;
values.push_back(Json::object {
{ "name", DNSRecordContent::NumberToType(item.first) },
{ "value", std::to_string(item.second) },
});
}
doc.push_back(Json::object {
{ "type", "MapStatisticItem" },
{ "name", "response-by-qtype" },
{ "value", values },
});
}
{
Json::array values;
for(const auto& item : resp_size_stats) {
if (item.second == 0)
continue;
values.push_back(Json::object {
{ "name", std::to_string(item.first) },
{ "value", std::to_string(item.second) },
});
}
doc.push_back(Json::object {
{ "type", "MapStatisticItem" },
{ "name", "response-sizes" },
{ "value", values },
});
}
{
Json::array values;
for(const auto& item : resp_rcode_stats) {
if (item.second == 0)
continue;
values.push_back(Json::object {
{ "name", RCode::to_s(item.first) },
{ "value", std::to_string(item.second) },
});
}
doc.push_back(Json::object {
{ "type", "MapStatisticItem" },
{ "name", "response-by-rcode" },
{ "value", values },
});
}
#ifndef RECURSOR
for(const auto& ringName : S.listRings()) {
Json::array values;
const auto& ring = S.getRing(ringName);
for(const auto& item : ring) {
if (item.second == 0)
continue;
values.push_back(Json::object {
{ "name", item.first },
{ "value", std::to_string(item.second) },
});
}
doc.push_back(Json::object {
{ "type", "RingStatisticItem" },
{ "name", ringName },
{ "size", std::to_string(S.getRingSize(ringName)) },
{ "value", values },
});
}
#endif
resp->setBody(doc);
}
DNSName apiNameToDNSName(const string& name) {
if (!isCanonical(name)) {
throw ApiException("DNS Name '" + name + "' is not canonical");
}
try {
return DNSName(name);
} catch (...) {
throw ApiException("Unable to parse DNS Name '" + name + "'");
}
}
DNSName apiZoneIdToName(const string& id) {
string zonename;
ostringstream ss;
if(id.empty())
throw HttpBadRequestException();
std::size_t lastpos = 0, pos = 0;
while ((pos = id.find('=', lastpos)) != string::npos) {
ss << id.substr(lastpos, pos-lastpos);
char c;
// decode tens
if (id[pos+1] >= '0' && id[pos+1] <= '9') {
c = id[pos+1] - '0';
} else if (id[pos+1] >= 'A' && id[pos+1] <= 'F') {
c = id[pos+1] - 'A' + 10;
} else {
throw HttpBadRequestException();
}
c = c * 16;
// decode unit place
if (id[pos+2] >= '0' && id[pos+2] <= '9') {
c += id[pos+2] - '0';
} else if (id[pos+2] >= 'A' && id[pos+2] <= 'F') {
c += id[pos+2] - 'A' + 10;
} else {
throw HttpBadRequestException();
}
ss << c;
lastpos = pos+3;
}
if (lastpos < pos) {
ss << id.substr(lastpos, pos-lastpos);
}
zonename = ss.str();
try {
return DNSName(zonename);
} catch (...) {
throw ApiException("Unable to parse DNS Name '" + zonename + "'");
}
}
string apiZoneNameToId(const DNSName& dname) {
string name=dname.toString();
ostringstream ss;
for(string::const_iterator iter = name.begin(); iter != name.end(); ++iter) {
if ((*iter >= 'A' && *iter <= 'Z') ||
(*iter >= 'a' && *iter <= 'z') ||
(*iter >= '0' && *iter <= '9') ||
(*iter == '.') || (*iter == '-')) {
ss << *iter;
} else {
ss << (boost::format("=%02X") % (int)(*iter));
}
}
string id = ss.str();
// add trailing dot
if (id.size() == 0 || id.substr(id.size()-1) != ".") {
id += ".";
}
// special handling for the root zone, as a dot on it's own doesn't work
// everywhere.
if (id == ".") {
id = (boost::format("=%02X") % (int)('.')).str();
}
return id;
}
void apiCheckNameAllowedCharacters(const string& name) {
if (name.find_first_not_of("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890_/.-") != std::string::npos)
throw ApiException("Name '"+name+"' contains unsupported characters");
}
void apiCheckQNameAllowedCharacters(const string& qname) {
if (qname.compare(0, 2, "*.") == 0) apiCheckNameAllowedCharacters(qname.substr(2));
else apiCheckNameAllowedCharacters(qname);
}