/* Various functions to work with socket addresses.

*

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

*/

#include <cstdlib>

#include <cstring>

#include <arpa/inet.h>

#include <netdb.h>

#include <villas/exceptions.hpp>

#include <villas/socket_addr.hpp>

#include <villas/utils.hpp>

#ifdef WITH_SOCKET_LAYER_ETH

#include <villas/kernel/nl.hpp>

#endif // WITH_SOCKET_LAYER_ETH

using namespace villas;

using namespace villas::node;

using namespace villas::utils;

char *villas::node::socket_print_addr(struct sockaddr *saddr) {

union sockaddr_union *sa = reinterpret_cast<union sockaddr_union *>(saddr);

auto *buf = reinterpret_cast<char *>(::malloc(256));

if (!buf)

throw MemoryAllocationError();

// Address

switch (sa->sa.sa_family) {

case AF_INET6:

inet_ntop(AF_INET6, &sa->sin6.sin6_addr, buf, 64);

break;

case AF_INET:

inet_ntop(AF_INET, &sa->sin.sin_addr, buf, 64);

break;

#ifdef WITH_SOCKET_LAYER_ETH

case AF_PACKET:

strcatf(&buf, "%02x", sa->sll.sll_addr[0]);

for (int i = 1; i < sa->sll.sll_halen; i++)

strcatf(&buf, ":%02x", sa->sll.sll_addr[i]);

break;

#endif // WITH_SOCKET_LAYER_ETH

case AF_UNIX:

snprintf(buf, 256, "%s", sa->sun.sun_path);

break;

default:

throw RuntimeError("Unknown address family: '{}'", sa->sa.sa_family);

}

// Port / Interface

switch (sa->sa.sa_family) {

case AF_INET6:

case AF_INET:

strcatf(&buf, ":%hu", ntohs(sa->sin.sin_port));

break;

#ifdef WITH_SOCKET_LAYER_ETH

case AF_PACKET: {

struct nl_cache *cache = nl_cache_mngt_require("route/link");

struct rtnl_link *link = rtnl_link_get(cache, sa->sll.sll_ifindex);

if (!link)

throw RuntimeError("Failed to get interface for index: {}",

sa->sll.sll_ifindex);

strcatf(&buf, "%%%s", rtnl_link_get_name(link));

strcatf(&buf, ":%hu", ntohs(sa->sll.sll_protocol));

break;

}

#endif // WITH_SOCKET_LAYER_ETH

}

return buf;

}

int villas::node::socket_parse_address(const char *addr, struct sockaddr *saddr,

enum SocketLayer layer, int flags) {

// TODO: Add support for IPv6

union sockaddr_union *sa = reinterpret_cast<union sockaddr_union *>(saddr);

char *copy = strdup(addr);

int ret;

if (layer == SocketLayer::UNIX) { // Format: "/path/to/socket"

sa->sun.sun_family = AF_UNIX;

if (strlen(addr) > sizeof(sa->sun.sun_path) - 1) {

free(copy);

throw RuntimeError("Length of unix socket path is too long!");

}

memcpy(sa->sun.sun_path, addr, strlen(addr) + 1);

ret = 0;

}

#ifdef WITH_SOCKET_LAYER_ETH

else if (layer ==

SocketLayer::ETH) { // Format: "ab:cd:ef:12:34:56%ifname:protocol"

// Split string

char *lasts;

char *node = strtok_r(copy, "%", &lasts);

char *ifname = strtok_r(nullptr, ":", &lasts);

char *proto = strtok_r(nullptr, "\0", &lasts);

// Parse link layer (MAC) address

struct ether_addr *mac = ether_aton(node);

if (!mac)

throw RuntimeError("Failed to parse MAC address: {}", node);

memcpy(&sa->sll.sll_addr, &mac->ether_addr_octet, ETHER_ADDR_LEN);

// Get interface index from name

kernel::nl::init();

struct nl_cache *cache = nl_cache_mngt_require("route/link");

struct rtnl_link *link = rtnl_link_get_by_name(cache, ifname);

if (!link)

throw RuntimeError("Failed to get network interface: '{}'", ifname);

sa->sll.sll_protocol =

htons(proto ? strtol(proto, nullptr, 0) : ETH_P_VILLAS);

sa->sll.sll_halen = ETHER_ADDR_LEN;

sa->sll.sll_family = AF_PACKET;

sa->sll.sll_ifindex = rtnl_link_get_ifindex(link);

ret = 0;

}

#endif // WITH_SOCKET_LAYER_ETH

else { // Format: "192.168.0.10:12001"

struct addrinfo hint = {.ai_flags = flags, .ai_family = AF_UNSPEC};

// Split string

char *lasts;

char *node = strtok_r(copy, ":", &lasts);

char *service = strtok_r(nullptr, "\0", &lasts);

if (node && !strcmp(node, "*"))

node = nullptr;

if (service && !strcmp(service, "*"))

service = nullptr;

switch (layer) {

case SocketLayer::IP:

hint.ai_socktype = SOCK_RAW;

hint.ai_protocol =

(service) ? strtol(service, nullptr, 0) : IPPROTO_VILLAS;

hint.ai_flags |= AI_NUMERICSERV;

break;

case SocketLayer::UDP:

hint.ai_socktype = SOCK_DGRAM;

hint.ai_protocol = IPPROTO_UDP;

break;

case SocketLayer::TCP_CLIENT:

case SocketLayer::TCP_SERVER:

hint.ai_socktype = SOCK_STREAM;

hint.ai_protocol = IPPROTO_TCP;

break;

default:

throw RuntimeError("Invalid address type");

}

// Lookup address

struct addrinfo *result;

ret = getaddrinfo(node, (layer == SocketLayer::IP) ? nullptr : service,

&hint, &result);

if (!ret) {

if (layer == SocketLayer::IP) {

// We mis-use the sin_port field to store the IP protocol number on RAW sockets

struct sockaddr_in *sin = (struct sockaddr_in *)result->ai_addr;

sin->sin_port = htons(result->ai_protocol);

}

memcpy(sa, result->ai_addr, result->ai_addrlen);

freeaddrinfo(result);

}

}

free(copy);

return ret;

}

int villas::node::socket_compare_addr(struct sockaddr *x, struct sockaddr *y) {

#define CMP(a, b) \

if (a != b) \

return a < b ? -1 : 1

union sockaddr_union *xu = reinterpret_cast<union sockaddr_union *>(x);

union sockaddr_union *yu = reinterpret_cast<union sockaddr_union *>(y);

CMP(x->sa_family, y->sa_family);

switch (x->sa_family) {

case AF_UNIX:

return strcmp(xu->sun.sun_path, yu->sun.sun_path);

case AF_INET:

CMP(ntohl(xu->sin.sin_addr.s_addr), ntohl(yu->sin.sin_addr.s_addr));

CMP(ntohs(xu->sin.sin_port), ntohs(yu->sin.sin_port));

return 0;

case AF_INET6:

CMP(ntohs(xu->sin6.sin6_port), ntohs(yu->sin6.sin6_port));

// CMP(xu->sin6.sin6_flowinfo, yu->sin6.sin6_flowinfo);

// CMP(xu->sin6.sin6_scope_id, yu->sin6.sin6_scope_id);

return memcmp(xu->sin6.sin6_addr.s6_addr, yu->sin6.sin6_addr.s6_addr,

sizeof(xu->sin6.sin6_addr.s6_addr));

#ifdef WITH_SOCKET_LAYER_ETH

case AF_PACKET:

CMP(ntohs(xu->sll.sll_protocol), ntohs(yu->sll.sll_protocol));

CMP(xu->sll.sll_ifindex, yu->sll.sll_ifindex);

// CMP(xu->sll.sll_pkttype, yu->sll.sll_pkttype);

// CMP(xu->sll.sll_hatype, yu->sll.sll_hatype);

CMP(xu->sll.sll_halen, yu->sll.sll_halen);

return memcmp(xu->sll.sll_addr, yu->sll.sll_addr, xu->sll.sll_halen);

#endif // WITH_SOCKET_LAYER_ETH

default:

return -1;

}

#undef CMP

}