214 lines
4.2 KiB
C
214 lines
4.2 KiB
C
/*
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============================================================================
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Name : hev-tsocks-cache.c
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Author : Heiher <r@hev.cc>
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Copyright : Copyright (c) 2017 - 2021 hev
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Description : Transparent Socket Cache
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============================================================================
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*/
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#include <string.h>
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#include <unistd.h>
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#include <hev-task.h>
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#include <hev-task-io.h>
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#include <hev-task-io-socket.h>
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#include <hev-memory-allocator.h>
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#include "hev-list.h"
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#include "hev-rbtree.h"
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#include "hev-logger.h"
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#include "hev-compiler.h"
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#include "hev-config-const.h"
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#include "hev-tsocks-cache.h"
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typedef struct _HevTSock HevTSock;
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struct _HevTSock
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{
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HevListNode lnode;
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HevRBTreeNode rnode;
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struct sockaddr_in6 addr;
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int fd;
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};
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static int cached;
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static HevList lru;
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static HevRBTree cache;
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int
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hev_tsocks_cache_init (void)
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{
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LOG_D ("tsocks cache init");
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cached = 0;
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memset (&lru, 0, sizeof (lru));
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memset (&cache, 0, sizeof (cache));
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return 0;
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}
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static HevTSock *
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hev_tsocks_cache_tsock_new (struct sockaddr *addr)
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{
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HevTSock *self;
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int addrlen;
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int one = 1;
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int res;
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int fd;
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addrlen = sizeof (struct sockaddr_in6);
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fd = hev_task_io_socket_socket (AF_INET6, SOCK_DGRAM, 0);
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if (fd < 0)
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return NULL;
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res = setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof (one));
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if (res < 0)
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goto close;
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res = setsockopt (fd, SOL_IPV6, IPV6_TRANSPARENT, &one, sizeof (one));
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if (res < 0)
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goto close;
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res = bind (fd, addr, addrlen);
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if (res < 0)
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goto close;
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self = hev_malloc0 (sizeof (HevTSock));
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if (res < 0)
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goto close;
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LOG_D ("%p tsocks cache tsock new", self);
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self->fd = fd;
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memcpy (&self->addr, addr, addrlen);
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return self;
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close:
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close (fd);
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return NULL;
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}
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static void
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hev_tsocks_cache_tsock_destroy (HevTSock *self)
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{
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LOG_D ("%p tsocks cache tsock destroy", self);
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close (self->fd);
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hev_free (self);
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}
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void
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hev_tsocks_cache_fini (void)
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{
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HevListNode *node;
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LOG_D ("tsocks cache fini");
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node = hev_list_first (&lru);
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while (node) {
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HevTSock *ts;
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ts = container_of (node, HevTSock, lnode);
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node = hev_list_node_next (node);
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hev_tsocks_cache_tsock_destroy (ts);
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}
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}
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static HevTSock *
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hev_tsocks_cache_find (struct sockaddr *addr)
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{
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HevRBTreeNode *node = cache.root;
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while (node) {
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HevTSock *this;
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int res;
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this = container_of (node, HevTSock, rnode);
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res = memcmp (&this->addr, addr, sizeof (struct sockaddr_in6));
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if (res < 0)
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node = node->left;
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else if (res > 0)
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node = node->right;
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else
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return this;
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}
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return NULL;
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}
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static void
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hev_tsocks_cache_add (HevTSock *ts)
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{
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HevRBTreeNode **new = &cache.root, *parent = NULL;
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while (*new) {
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HevTSock *this;
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int res;
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this = container_of (*new, HevTSock, rnode);
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res = memcmp (&this->addr, &ts->addr, sizeof (struct sockaddr_in6));
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parent = *new;
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if (res < 0)
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new = &((*new)->left);
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else if (res > 0)
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new = &((*new)->right);
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}
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cached++;
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hev_list_add_tail (&lru, &ts->lnode);
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hev_rbtree_node_link (&ts->rnode, parent, new);
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hev_rbtree_insert_color (&cache, &ts->rnode);
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}
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static void
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hev_tsocks_cache_del (HevTSock *ts)
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{
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cached--;
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hev_list_del (&lru, &ts->lnode);
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hev_rbtree_erase (&cache, &ts->rnode);
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}
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static void
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hev_tsocks_cache_update (HevTSock *ts)
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{
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hev_list_del (&lru, &ts->lnode);
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hev_list_add_tail (&lru, &ts->lnode);
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}
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int
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hev_tsocks_cache_get (struct sockaddr *addr)
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{
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HevTSock *ts;
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LOG_D ("tsocks cache get");
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ts = hev_tsocks_cache_find (addr);
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if (ts) {
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hev_tsocks_cache_update (ts);
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return ts->fd;
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}
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if (cached >= TSOCKS_MAX_CACHED) {
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HevListNode *node;
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node = hev_list_first (&lru);
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ts = container_of (node, HevTSock, lnode);
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hev_tsocks_cache_del (ts);
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hev_tsocks_cache_tsock_destroy (ts);
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}
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ts = hev_tsocks_cache_tsock_new (addr);
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if (!ts)
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return -1;
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hev_tsocks_cache_add (ts);
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return ts->fd;
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}
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