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utun2/src/transport_layer/auto_socket.c

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/*
* auto_socket.c — автоматическое управление UDP-сокетами при изменении сетевых интерфейсов
*
* При auto_sockets=yes:
* - Для каждого не-loopback интерфейса (UP, с IP-адресами) создаётся UDP-сокет
* с bind на 0.0.0.0/[::] + случайный порт, привязанный к интерфейсу (SO_BINDTODEVICE)
* - Тип: PUBLIC если есть публичный адрес, иначе NAT
* - При добавлении сокета — линки ко всем активным NCD-соединениям
* - При удалении интерфейса — линки удаляются, сокет закрывается
*
* Стратегия reconcile:
* При любом изменении адресов/линков сканируем фактические IP интерфейса,
* сравниваем с состоянием сокетов и устраняем расхождения:
* - появился адрес нужного family → создать сокет + линки
* - исчезли все адреса family → удалить сокет + линки
* - изменился тип (NAT↔PUBLIC) → пересоздать сокет с новым типом + линки
* - без изменений → только обновить interface_addr
* - интерфейс стал DOWN → удалить все сокеты
*
* Слои:
* Platform-agnostic: auto_socket_add_interface / auto_socket_remove_interface
* Platform monitoring: netlink (Linux), route socket (BSD), IP Helper (Windows)
*/
#include "auto_socket.h"
#include "etcp_connections.h"
#include "etcp_api.h"
#include "node_conn_direct.h"
#include "socket_monitor.h"
#include "utun_instance.h"
#include "config_parser.h"
#include "../lib/debug_config.h"
#include "../lib/mem.h"
#include "../lib/u_async.h"
#include "../lib/socket_compat.h"
#include "../lib/platform_compat.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#if !defined(_WIN32)
#include <unistd.h>
#include <net/if.h>
#include <ifaddrs.h>
#endif
#ifdef __linux__
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <net/route.h>
#include <net/if_dl.h>
#include <fcntl.h>
#elif defined(_WIN32)
#include <iphlpapi.h>
#include <netioapi.h>
#include <ws2ipdef.h>
#endif
#define DEBUG_CATEGORY_AS DEBUG_CATEGORY_SOCKET
/* ─── IPv4-адрес: публичный (интернет) или приватный/NAT ─── */
static int is_ipv4_public(uint32_t addr_be) {
uint32_t a = ntohl(addr_be);
if ((a & 0xFF000000u) == 0x0A000000u) return 0; /* 10.0.0.0/8 */
if ((a & 0xFFF00000u) == 0xAC100000u) return 0; /* 172.16.0.0/12 */
if ((a & 0xFFFF0000u) == 0xC0A80000u) return 0; /* 192.168.0.0/16 */
if ((a & 0xFF000000u) == 0x7F000000u) return 0; /* 127.0.0.0/8 */
if ((a & 0xFFFF0000u) == 0xA9FE0000u) return 0; /* 169.254.0.0/16 */
if ((a & 0xFF000000u) == 0x00000000u) return 0; /* 0.0.0.0/8 */
if ((a & 0xF0000000u) == 0xE0000000u) return 0; /* 224.0.0.0/4 */
if ((a & 0xF0000000u) == 0xF0000000u) return 0; /* 240.0.0.0/4 */
if ((a & 0xFFC00000u) == 0x64400000u) return 0; /* 100.64.0.0/10 (CGNAT) */
return 1;
}
/* ─── IPv6-адрес: глобальный или локальный (аналог cm_classify_v6_addr) ─── */
#define AS_V6_LL 0
#define AS_V6_LOC 1
#define AS_V6_DIR 2
#define AS_V6_OTH 3
static int v6_classify(const uint8_t addr[16]) {
if (addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80) return AS_V6_LL;
if (addr[0] == 0xfc || addr[0] == 0xfd) return AS_V6_LOC;
if (addr[0] == 0xff) return AS_V6_OTH;
{ static const uint8_t z[16]; if (!memcmp(addr, z, 16)) return AS_V6_OTH; }
{ static const uint8_t lb[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; if (!memcmp(addr, lb, 16)) return AS_V6_OTH; }
return AS_V6_DIR;
}
/* ─── Внутреннее состояние модуля ─── */
struct auto_sock_iface {
struct auto_sock_iface* next;
uint32_t netif_index;
struct ETCP_SOCKET* v4_sock;
struct ETCP_SOCKET* v6_sock;
uint8_t v4_type; /* текущий тип v4 сокета: CFG_SERVER_TYPE_PUBLIC / CFG_SERVER_TYPE_NAT */
uint8_t v6_type; /* текущий тип v6 сокета */
};
struct AUTO_SOCKET {
struct UTUN_INSTANCE* instance;
struct auto_sock_iface* ifaces;
#ifdef __linux__
socket_t nl_sock;
void* uasync_handle;
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
socket_t route_sock;
void* uasync_handle;
#elif defined(_WIN32)
HANDLE addr_notify_handle;
HANDLE route_notify_handle;
#endif
};
/* ─── forward declarations ─── */
static int create_iface_socket(struct AUTO_SOCKET* as, uint32_t ifindex, const char* ifname, int family, uint8_t type);
static void remove_iface_sockets(struct AUTO_SOCKET* as, uint32_t ifindex);
static int scan_and_classify_iface(uint32_t ifindex, const char* ifname, int* out_has_v4, int* out_has_v6, uint8_t* out_v4_type, uint8_t* out_v6_type);
static void reconcile_iface(struct AUTO_SOCKET* as, uint32_t ifindex, const char* ifname);
static void auto_socket_scan_all(struct AUTO_SOCKET* as);
/* ═══════════ Platform-agnostic core ═══════════ */
static uint16_t random_port(void) {
uint32_t r;
random_bytes((uint8_t*)&r, sizeof(r));
return (uint16_t)((r % (65535 - 1024)) + 1024);
}
static int create_iface_socket(struct AUTO_SOCKET* as, uint32_t ifindex, const char* ifname, int family, uint8_t type) {
struct UTUN_INSTANCE* inst = as->instance;
struct CFG_SERVER server;
memset(&server, 0, sizeof(server));
snprintf(server.name, sizeof(server.name), "as_%s_%s", ifname, family == AF_INET6 ? "v6" : "v4");
server.type = type;
server.netif_index = ifindex;
server.transport = 0;
server.mtu = inst->config ? inst->config->global.mtu : 1500;
if (family == AF_INET) {
struct sockaddr_in* sin = (struct sockaddr_in*)&server.ip;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY;
} else {
struct sockaddr_in6* sin6 = (struct sockaddr_in6*)&server.ip;
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = in6addr_any;
}
for (int attempt = 0; attempt < 10; attempt++) {
uint16_t port = random_port();
if (family == AF_INET)
((struct sockaddr_in*)&server.ip)->sin_port = htons(port);
else
((struct sockaddr_in6*)&server.ip)->sin6_port = htons(port);
struct ETCP_SOCKET* es = etcp_socket_add(inst, &server);
if (!es) {
DEBUG_WARN(DEBUG_CATEGORY_AS, "[as] socket create failed if=%s fam=%d port=%u att=%d err=%d",
ifname, family, port, attempt + 1, socket_get_error());
if (socket_get_error() != EADDRINUSE) return -1;
continue;
}
socket_monitor_update_if_addr(es);
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] socket created: name=%s fd=%d if=%s(%u) type=%d addr=%s",
es->name, (int)es->fd, ifname, ifindex, type,
sockaddr_storage_to_str(&es->local_addr).str);
int links = ncd_add_socket_links(inst, es);
if (links > 0)
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] added %d links to socket %s", links, es->name);
return 0;
}
DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] failed to create socket after 10 attempts if=%s fam=%d", ifname, family);
return -1;
}
int auto_socket_add_interface(struct UTUN_INSTANCE* inst, uint32_t ifindex,
const char* ifname, int has_v4, int has_v6,
uint8_t v4_type, uint8_t v6_type) {
if (!inst || !inst->auto_socket_state || !ifname) return 0;
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)inst->auto_socket_state;
#if !defined(_WIN32)
if (ifindex == 0) ifindex = if_nametoindex(ifname);
#endif
if (ifindex == 0) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] ifindex=0 for %s", ifname); return 0; }
struct auto_sock_iface* ifa = as->ifaces;
while (ifa) { if (ifa->netif_index == ifindex) return 0; ifa = ifa->next; }
ifa = u_calloc(1, sizeof(*ifa));
if (!ifa) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] alloc failed"); return 0; }
ifa->netif_index = ifindex;
int added = 0;
if (has_v4) {
if (create_iface_socket(as, ifindex, ifname, AF_INET, v4_type) == 0) {
added++; ifa->v4_type = v4_type;
struct ETCP_SOCKET* s = inst->etcp_sockets;
while (s) { if (s->netif_index == ifindex && s->local_addr.ss_family == AF_INET) { ifa->v4_sock = s; break; } s = s->next; }
}
}
if (has_v6) {
if (create_iface_socket(as, ifindex, ifname, AF_INET6, v6_type) == 0) {
added++; ifa->v6_type = v6_type;
struct ETCP_SOCKET* s = inst->etcp_sockets;
while (s) { if (s->netif_index == ifindex && s->local_addr.ss_family == AF_INET6) { ifa->v6_sock = s; break; } s = s->next; }
}
}
if (added > 0) {
ifa->next = as->ifaces; as->ifaces = ifa;
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] added iface %s idx=%u socks=%d v4=%d v6=%d v4t=%d v6t=%d",
ifname, ifindex, added, has_v4, has_v6, v4_type, v6_type);
} else {
u_free(ifa);
}
return added;
}
void auto_socket_remove_interface(struct UTUN_INSTANCE* inst, uint32_t ifindex) {
if (!inst || !inst->auto_socket_state || ifindex == 0) return;
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)inst->auto_socket_state;
remove_iface_sockets(as, ifindex);
}
static void remove_iface_sockets(struct AUTO_SOCKET* as, uint32_t ifindex) {
struct auto_sock_iface** pp = &as->ifaces;
while (*pp) {
if ((*pp)->netif_index == ifindex) {
struct auto_sock_iface* ifa = *pp;
*pp = ifa->next;
if (ifa->v4_sock) {
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] removing v4 socket %s ifidx=%u", ifa->v4_sock->name, ifindex);
ncd_remove_socket_links(as->instance, ifa->v4_sock);
etcp_socket_remove(ifa->v4_sock);
}
if (ifa->v6_sock) {
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] removing v6 socket %s ifidx=%u", ifa->v6_sock->name, ifindex);
ncd_remove_socket_links(as->instance, ifa->v6_sock);
etcp_socket_remove(ifa->v6_sock);
}
u_free(ifa);
return;
}
pp = &(*pp)->next;
}
}
/* ─── Сканирование адресов интерфейса и определение типа ─── */
#if !defined(_WIN32)
static int scan_and_classify_iface(uint32_t ifindex, const char* ifname,
int* out_has_v4, int* out_has_v6,
uint8_t* out_v4_type, uint8_t* out_v6_type) {
(void)ifindex;
*out_has_v4 = 0; *out_has_v6 = 0;
*out_v4_type = CFG_SERVER_TYPE_NAT;
*out_v6_type = CFG_SERVER_TYPE_NAT;
struct ifaddrs* ifa_list = NULL;
if (getifaddrs(&ifa_list) < 0) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] getifaddrs: %s", strerror(errno)); return -1; }
int is_up = 0;
for (struct ifaddrs* ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr) continue;
if (strcmp(ifa->ifa_name, ifname) != 0) continue;
if (ifa->ifa_flags & IFF_UP) is_up = 1;
if (!(ifa->ifa_flags & IFF_UP)) continue;
if (ifa->ifa_addr->sa_family == AF_INET) {
struct sockaddr_in* sin = (struct sockaddr_in*)ifa->ifa_addr;
if (sin->sin_addr.s_addr == INADDR_ANY) continue;
*out_has_v4 = 1;
if (is_ipv4_public(sin->sin_addr.s_addr))
*out_v4_type = CFG_SERVER_TYPE_PUBLIC;
} else if (ifa->ifa_addr->sa_family == AF_INET6) {
struct sockaddr_in6* sin6 = (struct sockaddr_in6*)ifa->ifa_addr;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) continue;
if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) continue;
*out_has_v6 = 1;
if (v6_classify(sin6->sin6_addr.s6_addr) == AS_V6_DIR)
*out_v6_type = CFG_SERVER_TYPE_PUBLIC;
}
}
freeifaddrs(ifa_list);
/* интерфейс не UP — адреса не релевантны */
if (!is_up) { *out_has_v4 = 0; *out_has_v6 = 0; }
return 0;
}
static void auto_socket_scan_all(struct AUTO_SOCKET* as) {
struct ifaddrs* ifa_list = NULL;
if (getifaddrs(&ifa_list) < 0) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] getifaddrs: %s", strerror(errno)); return; }
int up_count = 0;
char up_names[64][IFNAMSIZ];
for (struct ifaddrs* ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr) continue;
if (!(ifa->ifa_flags & IFF_UP)) continue;
if (ifa->ifa_flags & IFF_LOOPBACK) continue;
int found = 0;
for (int i = 0; i < up_count; i++) { if (strcmp(up_names[i], ifa->ifa_name) == 0) { found = 1; break; } }
if (found) continue;
if (up_count >= 64) { DEBUG_WARN(DEBUG_CATEGORY_AS, "[as] too many interfaces, cap at 64"); break; }
strncpy(up_names[up_count], ifa->ifa_name, IFNAMSIZ - 1);
up_names[up_count][IFNAMSIZ - 1] = 0;
up_count++;
}
freeifaddrs(ifa_list);
for (int i = 0; i < up_count; i++)
reconcile_iface(as, if_nametoindex(up_names[i]), up_names[i]);
}
#else /* _WIN32 */
static int scan_and_classify_iface(uint32_t ifindex, const char* ifname,
int* out_has_v4, int* out_has_v6,
uint8_t* out_v4_type, uint8_t* out_v6_type) {
(void)ifindex; (void)ifname;
*out_has_v4 = 0; *out_has_v6 = 0;
*out_v4_type = CFG_SERVER_TYPE_NAT;
*out_v6_type = CFG_SERVER_TYPE_NAT;
return 0;
}
static void auto_socket_scan_all(struct AUTO_SOCKET* as) {
(void)as;
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] Windows: auto_socket_scan_all not yet implemented");
}
#endif /* _WIN32 */
/* ═══════════ reconcile: сверка и исправление состояния сокетов ═══════════ */
static void reconcile_iface(struct AUTO_SOCKET* as, uint32_t ifindex, const char* ifname) {
if (ifindex == 0) return;
int has_v4 = 0, has_v6 = 0;
uint8_t v4_need_type = CFG_SERVER_TYPE_NAT, v6_need_type = CFG_SERVER_TYPE_NAT;
if (scan_and_classify_iface(ifindex, ifname, &has_v4, &has_v6, &v4_need_type, &v6_need_type) < 0) return;
struct auto_sock_iface* ifa = as->ifaces;
while (ifa && ifa->netif_index != ifindex) ifa = ifa->next;
/* ── IPv4 ── */
{
struct ETCP_SOCKET* sock = ifa ? ifa->v4_sock : NULL;
uint8_t cur_type = ifa ? ifa->v4_type : CFG_SERVER_TYPE_NAT;
if (has_v4 && !sock) {
create_iface_socket(as, ifindex, ifname, AF_INET, v4_need_type);
if (!ifa) { ifa = u_calloc(1, sizeof(*ifa)); ifa->netif_index = ifindex; ifa->next = as->ifaces; as->ifaces = ifa; }
ifa->v4_type = v4_need_type;
{ struct ETCP_SOCKET* s = as->instance->etcp_sockets;
while (s) { if (s->netif_index == ifindex && s->local_addr.ss_family == AF_INET) { ifa->v4_sock = s; break; } s = s->next; } }
} else if (!has_v4 && sock) {
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] v4 removed: %s ifidx=%u", ifname, ifindex);
ncd_remove_socket_links(as->instance, sock);
etcp_socket_remove(sock);
ifa->v4_sock = NULL;
} else if (has_v4 && sock && cur_type != v4_need_type) {
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] v4 type changed: %s type %d→%d", ifname, cur_type, v4_need_type);
ncd_remove_socket_links(as->instance, sock);
etcp_socket_remove(sock);
create_iface_socket(as, ifindex, ifname, AF_INET, v4_need_type);
ifa->v4_type = v4_need_type;
{ struct ETCP_SOCKET* s = as->instance->etcp_sockets;
while (s) { if (s->netif_index == ifindex && s->local_addr.ss_family == AF_INET) { ifa->v4_sock = s; break; } s = s->next; } }
} else if (has_v4 && sock) {
socket_monitor_update_if_addr(sock);
etcp_socket_cbk_fire(sock, ETCP_SOCKET_EVENT_ADDR_CHANGED);
}
}
/* ── IPv6 ── */
{
struct ETCP_SOCKET* sock = ifa ? ifa->v6_sock : NULL;
uint8_t cur_type = ifa ? ifa->v6_type : CFG_SERVER_TYPE_NAT;
if (has_v6 && !sock) {
create_iface_socket(as, ifindex, ifname, AF_INET6, v6_need_type);
if (!ifa) { ifa = u_calloc(1, sizeof(*ifa)); ifa->netif_index = ifindex; ifa->next = as->ifaces; as->ifaces = ifa; }
ifa->v6_type = v6_need_type;
{ struct ETCP_SOCKET* s = as->instance->etcp_sockets;
while (s) { if (s->netif_index == ifindex && s->local_addr.ss_family == AF_INET6) { ifa->v6_sock = s; break; } s = s->next; } }
} else if (!has_v6 && sock) {
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] v6 removed: %s ifidx=%u", ifname, ifindex);
ncd_remove_socket_links(as->instance, sock);
etcp_socket_remove(sock);
ifa->v6_sock = NULL;
} else if (has_v6 && sock && cur_type != v6_need_type) {
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] v6 type changed: %s type %d→%d", ifname, cur_type, v6_need_type);
ncd_remove_socket_links(as->instance, sock);
etcp_socket_remove(sock);
create_iface_socket(as, ifindex, ifname, AF_INET6, v6_need_type);
ifa->v6_type = v6_need_type;
{ struct ETCP_SOCKET* s = as->instance->etcp_sockets;
while (s) { if (s->netif_index == ifindex && s->local_addr.ss_family == AF_INET6) { ifa->v6_sock = s; break; } s = s->next; } }
} else if (has_v6 && sock) {
socket_monitor_update_if_addr(sock);
etcp_socket_cbk_fire(sock, ETCP_SOCKET_EVENT_ADDR_CHANGED);
}
}
/* ── удалить запись если оба family пропали ── */
if (ifa && !ifa->v4_sock && !ifa->v6_sock) {
struct auto_sock_iface** pp = &as->ifaces;
while (*pp && *pp != ifa) pp = &(*pp)->next;
if (*pp) *pp = ifa->next;
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] iface record removed: %s idx=%u", ifname, ifindex);
u_free(ifa);
}
}
/* ═══════════ Platform monitoring ═══════════ */
/* ─── Linux: netlink ─── */
#ifdef __linux__
static void handle_nl_addr(struct AUTO_SOCKET* as, struct ifaddrmsg* ifa, int msg_type) {
(void)msg_type;
char ifname[IFNAMSIZ];
if (!if_indextoname(ifa->ifa_index, ifname)) return;
reconcile_iface(as, ifa->ifa_index, ifname);
}
static void handle_nl_link(struct AUTO_SOCKET* as, struct ifinfomsg* ifi, int msg_type) {
char ifname[IFNAMSIZ];
if (!if_indextoname(ifi->ifi_index, ifname)) return;
if (ifi->ifi_flags & IFF_LOOPBACK) return;
int is_up = (ifi->ifi_flags & IFF_UP) != 0;
if (msg_type == RTM_DELLINK || !is_up) {
remove_iface_sockets(as, ifi->ifi_index);
} else if (msg_type == RTM_NEWLINK && is_up) {
/* интерфейс появился или стал UP — сверяем (адреса могут уже быть) */
reconcile_iface(as, ifi->ifi_index, ifname);
}
}
static void auto_socket_netlink_cb(int fd, void* arg) {
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)arg;
char buf[8192];
struct sockaddr_nl nladdr;
socklen_t nladdr_len = sizeof(nladdr);
DEBUG_DEBUG(DEBUG_CATEGORY_AS, "[as] netlink cb fd=%d", fd);
for (;;) {
ssize_t n = recvfrom(fd, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr*)&nladdr, &nladdr_len);
if (n < 0) { if (errno == EAGAIN || errno == EWOULDBLOCK) break; DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] netlink recv: %s", strerror(errno)); break; }
if (n == 0) break;
size_t remaining = (size_t)n;
struct nlmsghdr* nlh = (struct nlmsghdr*)buf;
while (NLMSG_OK(nlh, remaining)) {
DEBUG_DEBUG(DEBUG_CATEGORY_AS, "[as] netlink msg type=%u len=%u", nlh->nlmsg_type, nlh->nlmsg_len);
if (nlh->nlmsg_type == RTM_NEWADDR || nlh->nlmsg_type == RTM_DELADDR)
handle_nl_addr(as, (struct ifaddrmsg*)NLMSG_DATA(nlh), nlh->nlmsg_type);
else if (nlh->nlmsg_type == RTM_NEWLINK || nlh->nlmsg_type == RTM_DELLINK)
handle_nl_link(as, (struct ifinfomsg*)NLMSG_DATA(nlh), nlh->nlmsg_type);
if (nlh->nlmsg_type == NLMSG_DONE) break;
nlh = NLMSG_NEXT(nlh, remaining);
}
}
}
static int auto_socket_init_monitor(struct AUTO_SOCKET* as) {
as->nl_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (as->nl_sock < 0) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] netlink socket: %s", strerror(errno)); return -1; }
struct sockaddr_nl nladdr;
memset(&nladdr, 0, sizeof(nladdr));
nladdr.nl_family = AF_NETLINK;
nladdr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;
if (bind(as->nl_sock, (struct sockaddr*)&nladdr, sizeof(nladdr)) < 0) {
DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] netlink bind: %s", strerror(errno)); close(as->nl_sock); return -1;
}
socket_set_nonblocking(as->nl_sock);
as->uasync_handle = uasync_add_socket(as->instance->ua, as->nl_sock, auto_socket_netlink_cb, NULL, NULL, as);
if (!as->uasync_handle) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] uasync_add_socket failed"); close(as->nl_sock); return -1; }
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] netlink monitor started: fd=%d", (int)as->nl_sock);
return 0;
}
static void auto_socket_destroy_monitor(struct AUTO_SOCKET* as) {
if (as->uasync_handle) { uasync_remove_socket(as->instance->ua, as->uasync_handle); as->uasync_handle = NULL; }
if (as->nl_sock >= 0) { close(as->nl_sock); as->nl_sock = -1; }
}
/* ─── BSD: route socket ─── */
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
static void auto_socket_bsd_cb(int fd, void* arg) {
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)arg;
char buf[8192];
for (;;) {
ssize_t n = read(fd, buf, sizeof(buf));
if (n < 0) { if (errno == EAGAIN || errno == EWOULDBLOCK) break; DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] route sock read: %s", strerror(errno)); break; }
if (n < (ssize_t)sizeof(struct rt_msghdr)) break;
struct rt_msghdr* rtm = (struct rt_msghdr*)buf;
if (rtm->rtm_version != RTM_VERSION) continue;
if (rtm->rtm_type == RTM_IFINFO || rtm->rtm_type == RTM_IFANNOUNCE || rtm->rtm_type == RTM_NEWADDR || rtm->rtm_type == RTM_DELADDR)
auto_socket_scan_all(as);
}
}
static int auto_socket_init_monitor(struct AUTO_SOCKET* as) {
as->route_sock = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
if (as->route_sock < 0) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] route socket: %s", strerror(errno)); return -1; }
fcntl(as->route_sock, F_SETFL, O_NONBLOCK);
as->uasync_handle = uasync_add_socket(as->instance->ua, as->route_sock, auto_socket_bsd_cb, NULL, NULL, as);
if (!as->uasync_handle) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] uasync_add_socket failed"); close(as->route_sock); return -1; }
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] route socket monitor started: fd=%d", (int)as->route_sock);
return 0;
}
static void auto_socket_destroy_monitor(struct AUTO_SOCKET* as) {
if (as->uasync_handle) { uasync_remove_socket(as->instance->ua, as->uasync_handle); as->uasync_handle = NULL; }
if (as->route_sock >= 0) { close(as->route_sock); as->route_sock = -1; }
}
/* ─── Windows: IP Helper ─── */
#elif defined(_WIN32)
static void process_win_notify(void* arg) {
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)arg;
auto_socket_scan_all(as);
}
static void WINAPI win_addr_change_cb(PVOID ctx, PMIB_UNICASTIPADDRESS_ROW row, MIB_NOTIFICATION_TYPE type) {
(void)row; (void)type;
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)ctx;
uasync_post(as->instance->ua, process_win_notify, as);
}
static void WINAPI win_route_change_cb(PVOID ctx, PMIB_IPFORWARD_ROW2 row, MIB_NOTIFICATION_TYPE type) {
(void)row; (void)type;
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)ctx;
uasync_post(as->instance->ua, process_win_notify, as);
}
static int auto_socket_init_monitor(struct AUTO_SOCKET* as) {
DWORD ret = NotifyUnicastIpAddressChange(AF_UNSPEC, win_addr_change_cb, as, FALSE, &as->addr_notify_handle);
if (ret != NO_ERROR) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] NotifyUnicastIpAddressChange: %lu", (unsigned long)ret); return -1; }
ret = NotifyRouteChange2(AF_UNSPEC, win_route_change_cb, as, FALSE, &as->route_notify_handle);
if (ret != NO_ERROR) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] NotifyRouteChange2: %lu", (unsigned long)ret); CancelMibChangeNotify2(as->addr_notify_handle); return -1; }
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] Windows IP Helper monitor started");
return 0;
}
static void auto_socket_destroy_monitor(struct AUTO_SOCKET* as) {
if (as->addr_notify_handle) { CancelMibChangeNotify2(as->addr_notify_handle); as->addr_notify_handle = NULL; }
if (as->route_notify_handle) { CancelMibChangeNotify2(as->route_notify_handle); as->route_notify_handle = NULL; }
}
#else
static int auto_socket_init_monitor(struct AUTO_SOCKET* as) { (void)as; return 0; }
static void auto_socket_destroy_monitor(struct AUTO_SOCKET* as) { (void)as; }
#endif
/* ═══════════ Public API ═══════════ */
int auto_socket_init(struct UTUN_INSTANCE* inst) {
if (!inst) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] instance is NULL"); return -1; }
if (!inst->config || !inst->config->global.auto_sockets) return 0;
if (inst->auto_socket_state) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] already initialized"); return -1; }
struct AUTO_SOCKET* as = u_calloc(1, sizeof(*as));
if (!as) { DEBUG_ERROR(DEBUG_CATEGORY_AS, "[as] alloc failed"); return -1; }
as->instance = inst;
inst->auto_socket_state = as;
if (auto_socket_init_monitor(as) < 0) { u_free(as); inst->auto_socket_state = NULL; return -1; }
auto_socket_scan_all(as);
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] initialized");
return 0;
}
void auto_socket_destroy(struct UTUN_INSTANCE* inst) {
if (!inst || !inst->auto_socket_state) return;
struct AUTO_SOCKET* as = (struct AUTO_SOCKET*)inst->auto_socket_state;
inst->auto_socket_state = NULL;
auto_socket_destroy_monitor(as);
/* удаляем только записи ifaces, сокеты освобождает основной цикл очистки utun_instance_destroy */
while (as->ifaces) {
struct auto_sock_iface* ifa = as->ifaces;
as->ifaces = ifa->next;
ncd_remove_socket_links(as->instance, ifa->v4_sock);
ncd_remove_socket_links(as->instance, ifa->v6_sock);
u_free(ifa);
}
DEBUG_INFO(DEBUG_CATEGORY_AS, "[as] destroyed");
u_free(as);
}