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slp_message_handler.cpp
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slp_message_handler.cpp
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#include "slp.hpp"
#include <arpa/inet.h>
#include <dirent.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <string.h>
#include <algorithm>
#include "config.h"
#include "endian.hpp"
#include "slp_meta.hpp"
namespace slp
{
namespace handler
{
namespace internal
{
buffer prepareHeader(const Message& req)
{
uint8_t length = slp::header::MIN_LEN + /* 14 bytes for header */
req.header.langtag.length() + /* Actual length of lang tag */
slp::response::SIZE_ERROR; /* 2 bytes for error code */
buffer buff(length, 0);
buff[slp::header::OFFSET_VERSION] = req.header.version;
//will increment the function id from 1 as reply
buff[slp::header::OFFSET_FUNCTION] = req.header.functionID + 1;
std::copy_n(&length, slp::header::SIZE_LENGTH,
buff.data() +
slp::header::OFFSET_LENGTH);
auto flags = endian::to_network(req.header.flags);
std::copy_n((uint8_t*)&flags, slp::header::SIZE_FLAGS,
buff.data() +
slp::header::OFFSET_FLAGS);
std::copy_n(req.header.extOffset.data(), slp::header::SIZE_EXT,
buff.data() +
slp::header::OFFSET_EXT);
auto xid = endian::to_network(req.header.xid);
std::copy_n((uint8_t*)&xid, slp::header::SIZE_XID,
buff.data() +
slp::header::OFFSET_XID);
uint16_t langtagLen = req.header.langtag.length();
langtagLen = endian::to_network(langtagLen);
std::copy_n((uint8_t*)&langtagLen, slp::header::SIZE_LANG,
buff.data() +
slp::header::OFFSET_LANG_LEN);
std::copy_n((uint8_t*)req.header.langtag.c_str(), req.header.langtag.length(),
buff.data() +
slp::header::OFFSET_LANG);
return buff;
}
std::tuple<int, buffer> processSrvTypeRequest(
const Message& req)
{
/*
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Location header (function = SrvTypeRply = 10) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error Code | length of <srvType-list> |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| <srvtype--list> \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
buffer buff;
//read the slp service info from conf and create the service type string
slp::handler::internal::ServiceList svcList =
slp::handler::internal::readSLPServiceInfo();
if (svcList.size() <= 0)
{
buff.resize(0);
std::cerr << "SLP unable to read the service info\n";
return std::make_tuple((int)slp::Error::INTERNAL_ERROR, buff);
}
std::string service;
bool firstIteration = true;
for_each(svcList.cbegin(), svcList.cend(),
[&service, &firstIteration](const auto& svc)
{
if (firstIteration == true)
{
service = svc.first;
firstIteration = false;
}
else
{
service += ",";
service += svc.first;
}
});
buff = prepareHeader(req);
/* Need to modify the length and the function type field of the header
* as it is dependent on the handler of the service */
std::cout << "service=" << service.c_str() << "\n";
uint8_t length = buff.size() + /* 14 bytes header + length of langtag */
slp::response::SIZE_ERROR + /* 2 byte err code */
slp::response::SIZE_SERVICE + /* 2 byte srvtype len */
service.length();
buff.resize(length);
std::copy_n(&length, slp::header::SIZE_LENGTH,
buff.data() +
slp::header::OFFSET_LENGTH);
/* error code is already set to 0 moving to service type len */
uint16_t serviceTypeLen = service.length();
serviceTypeLen = endian::to_network(serviceTypeLen);
std::copy_n((uint8_t*)&serviceTypeLen, slp::response::SIZE_SERVICE,
buff.data() +
slp::response::OFFSET_SERVICE_LEN);
/* service type data */
std::copy_n((uint8_t*)service.c_str(), service.length(),
(buff.data() +
slp::response::OFFSET_SERVICE));
return std::make_tuple(slp::SUCCESS, buff);
}
std::tuple<int, buffer> processSrvRequest(
const Message& req)
{
/*
Service Reply
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Location header (function = SrvRply = 2) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error Code | URL Entry count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| <URL Entry 1> ... <URL Entry N> \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
URL Entry
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Lifetime | URL Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|URL len, contd.| URL (variable length) \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|# of URL auths | Auth. blocks (if any) \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
buffer buff;
//Get all the services which are registered
slp::handler::internal::ServiceList svcList =
slp::handler::internal::readSLPServiceInfo();
if (svcList.size() <= 0)
{
buff.resize(0);
std::cerr << "SLP unable to read the service info\n";
return std::make_tuple((int)slp::Error::INTERNAL_ERROR, buff);
}
//return error if serice type doesn't match
auto& svcName = req.body.srvrqst.srvType;
auto svcIt = svcList.find(svcName);
if (svcIt == svcList.end())
{
buff.resize(0);
std::cerr << "SLP unable to find the service=" << svcName << "\n";
return std::make_tuple((int)slp::Error::INTERNAL_ERROR, buff);
}
//Get all the interface address
auto ifaddrList = slp::handler::internal::getIntfAddrs();
if (ifaddrList.size() <= 0)
{
buff.resize(0);
std::cerr << "SLP unable to read the interface address\n";
return std::make_tuple((int)slp::Error::INTERNAL_ERROR, buff);
}
buff = prepareHeader(req);
//Calculate the length and resize the buffer
uint8_t length = buff.size() + /* 14 bytes header + length of langtag */
slp::response::SIZE_ERROR + /* 2 bytes error code */
slp::response::SIZE_URL_COUNT; /* 2 bytes srvtype len */
buff.resize(length);
//Populate the url count
uint16_t urlCount = ifaddrList.size();
urlCount = endian::to_network(urlCount);
std::copy_n((uint8_t*)&urlCount, slp::response::SIZE_URL_COUNT,
buff.data() +
slp::response::OFFSET_URL_ENTRY);
//Find the service
const slp::ConfigData& svc = svcIt->second;
//Populate the URL Entries
auto pos = slp::response::OFFSET_URL_ENTRY + slp::response::SIZE_URL_COUNT;
for (const auto& addr : ifaddrList)
{
std::string url = svc.name + ':' + svc.type +
"//" + addr + ',' + svc.port;
buff.resize(buff.size() +
slp::response::SIZE_URL_ENTRY +
url.length());
uint8_t reserved = 0;
uint16_t auth = 0;
uint16_t lifetime = endian::to_network<uint16_t>(slp::LIFETIME);
uint16_t urlLength = url.length();
std::copy_n((uint8_t*)&reserved, slp::response::SIZE_RESERVED,
buff.data() + pos);
pos += slp::response::SIZE_RESERVED;
std::copy_n((uint8_t*)&lifetime, slp::response::SIZE_LIFETIME,
buff.data() + pos);
pos += slp::response::SIZE_LIFETIME;
urlLength = endian::to_network(urlLength);
std::copy_n((uint8_t*)&urlLength, slp::response::SIZE_URLLENGTH,
buff.data() + pos);
pos += slp::response::SIZE_URLLENGTH;
std::copy_n((uint8_t*)url.c_str(), url.length(),
buff.data() + pos);
pos += url.length();
std::copy_n((uint8_t*)&auth, slp::response::SIZE_AUTH,
buff.data() + pos);
pos += slp::response::SIZE_AUTH;
}
uint8_t packetLength = buff.size();
std::copy_n((uint8_t*)&packetLength, slp::header::SIZE_VERSION,
buff.data() +
slp::header::OFFSET_LENGTH);
return std::make_tuple((int)slp::SUCCESS, buff);
}
std::list<std::string> getIntfAddrs()
{
std::list<std::string> addrList;
struct ifaddrs* ifaddr;
// attempt to fill struct with ifaddrs
if (getifaddrs(&ifaddr) == -1)
{
return addrList;
}
slp::deleted_unique_ptr<ifaddrs> ifaddrPtr(ifaddr, [](ifaddrs * addr)
{
freeifaddrs(addr);
});
ifaddr = nullptr;
for (ifaddrs* ifa = ifaddrPtr.get(); ifa != nullptr; ifa = ifa->ifa_next)
{
// walk interfaces
if (ifa->ifa_addr == nullptr)
{
continue;
}
// get only INET interfaces not ipv6
if (ifa->ifa_addr->sa_family == AF_INET)
{
// if loopback, or not running ignore
if ((ifa->ifa_flags & IFF_LOOPBACK) ||
!(ifa->ifa_flags & IFF_RUNNING))
{
continue;
}
char tmp[INET_ADDRSTRLEN] = { 0 };
inet_ntop(AF_INET,
&(((struct sockaddr_in*)(ifa->ifa_addr))->sin_addr),
tmp,
sizeof(tmp));
addrList.emplace_back(tmp);
}
}
return addrList;
}
slp::handler::internal::ServiceList readSLPServiceInfo()
{
using namespace std::string_literals;
slp::handler::internal::ServiceList svcLst;
slp::ConfigData service;
struct dirent* dent = nullptr;
// Open the services dir and get the service info
// from service files.
// Service File format would be "ServiceName serviceType Port"
DIR* dir = opendir(SERVICE_DIR);
// wrap the pointer into smart pointer.
slp::deleted_unique_ptr<DIR> dirPtr(dir, [](DIR * dir)
{
if (!dir)
{
closedir(dir);
}
});
dir = nullptr;
if (dirPtr.get())
{
while ((dent = readdir(dirPtr.get())) != NULL)
{
if (dent->d_type == DT_REG) //regular file
{
auto absFileName = std::string(SERVICE_DIR) + dent->d_name;
std::ifstream readFile(absFileName);
readFile >> service;
service.name = "service:"s + service.name;
svcLst.emplace(service.name, service);
}
}
}
return svcLst;
}
}//namespace internal
std::tuple<int, buffer> processRequest(
const Message& msg)
{
int rc = slp::SUCCESS;
buffer resp(0);
std::cout << "SLP Processing Request="
<< msg.header.functionID <<"\n";
switch (msg.header.functionID)
{
case (uint8_t)slp::FunctionType::SRVTYPERQST:
std::tie(rc, resp) = slp::handler::internal::processSrvTypeRequest(msg);
break;
case (uint8_t)slp::FunctionType::SRVRQST:
std::tie(rc, resp) = slp::handler::internal::processSrvRequest(msg);
break;
default:
rc = (uint8_t)slp::Error::MSG_NOT_SUPPORTED;
}
return std::make_tuple(rc, resp);
}
buffer processError(const Message& req,
uint8_t err)
{
buffer buff;
buff = slp::handler::internal::prepareHeader(req);
std::copy_n(&err, slp::response::SIZE_ERROR,
buff.data() +
slp::response::OFFSET_ERROR);
return buff;
}
}//namespace handler
}//namespace slp