mirror
/
devilutionX-libzt
mirror of https://github.com/diasurgical/libzt.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
420 Commits
2 Branches
0 Tags
18 MiB
 
 
 
 
 
 
Tree: 4c9c28ae21
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '4c9c28ae21'
${ noResults }
devilutionX-libzt/src/picoTCP.cpp

706 lines
25 KiB
Raw Blame History

/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
// picoTCP
#include "pico_eth.h"
#include "pico_stack.h"
#include "pico_ipv4.h"
#include "pico_icmp4.h"
#include "pico_dev_tap.h"
#include "pico_protocol.h"
#include "pico_socket.h"
#include "pico_device.h"
#include "pico_ipv6.h"
// SDK
#include "ZeroTierSDK.h"
#include "Utilities.hpp"
#include "SocketTap.hpp"
#include "picoTCP.hpp"
//#include "RingBuffer.hpp"
// ZT
#include "Utils.hpp"
#include "OSUtils.hpp"
#include "Mutex.hpp"
#include "Constants.hpp"
#include "Phy.hpp"
extern "C" int pico_stack_init(void);
extern "C" void pico_stack_tick(void);
int pico_ipv4_to_string(PICO_IPV4_TO_STRING_SIG);
extern "C" int pico_ipv4_link_add(PICO_IPV4_LINK_ADD_SIG);
extern "C" int pico_device_init(PICO_DEVICE_INIT_SIG);
extern "C" int pico_string_to_ipv4(PICO_STRING_TO_IPV4_SIG);
extern "C" int pico_string_to_ipv6(PICO_STRING_TO_IPV6_SIG);
extern "C" int pico_socket_recvfrom(PICO_SOCKET_RECVFROM_SIG);
extern "C" struct pico_socket * pico_socket_open(PICO_SOCKET_OPEN_SIG);
extern "C" int pico_socket_connect(PICO_SOCKET_CONNECT_SIG);
extern "C" int pico_socket_listen(PICO_SOCKET_LISTEN_SIG);
extern "C" int pico_socket_write(PICO_SOCKET_WRITE_SIG);
extern "C" int pico_socket_close(PICO_SOCKET_CLOSE_SIG);
extern "C" struct pico_ipv6_link * pico_ipv6_link_add(PICO_IPV6_LINK_ADD_SIG);
/*
int pico_stack_recv(PICO_STACK_RECV_SIG);
int pico_icmp4_ping(PICO_ICMP4_PING_SIG);
int pico_socket_setoption(PICO_SOCKET_SETOPTION_SIG);
uint32_t pico_timer_add(PICO_TIMER_ADD_SIG);
int pico_socket_send(PICO_SOCKET_SEND_SIG);
int pico_socket_sendto(PICO_SOCKET_SENDTO_SIG);
int pico_socket_recv(PICO_SOCKET_RECV_SIG);
int pico_socket_bind(PICO_SOCKET_BIND_SIG);
int pico_socket_read(PICO_SOCKET_READ_SIG);
int pico_socket_shutdown(PICO_SOCKET_SHUTDOWN_SIG);
struct pico_socket * pico_socket_accept(PICO_SOCKET_ACCEPT_SIG);
*/
namespace ZeroTier {
bool picoTCP::pico_init_interface(SocketTap *tap, const InetAddress &ip)
{
DEBUG_INFO();
if (std::find(tap->_ips.begin(),tap->_ips.end(),ip) == tap->_ips.end()) {
tap->_ips.push_back(ip);
std::sort(tap->_ips.begin(),tap->_ips.end());
if(ip.isV4())
{
tap->picodev = new struct pico_device;
struct pico_ip4 ipaddr, netmask;
ipaddr.addr = *((uint32_t *)ip.rawIpData());
netmask.addr = *((uint32_t *)ip.netmask().rawIpData());
tap->picodev->send = pico_eth_send; // tx
tap->picodev->poll = pico_eth_poll; // rx
tap->picodev->mtu = tap->_mtu;
tap->picodev->tap = tap;
uint8_t mac[PICO_SIZE_ETH];
tap->_mac.copyTo(mac, PICO_SIZE_ETH);
if(pico_device_init(tap->picodev, "p4", mac) != 0) {
DEBUG_ERROR("dev init failed");
delete tap->picodev;
return false;
}
pico_ipv4_link_add(tap->picodev, ipaddr, netmask);
DEBUG_INFO("addr = %s", ip.toString().c_str());
return true;
}
if(ip.isV6())
{
char ipv6_str[INET6_ADDRSTRLEN], nm_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, ip.rawIpData(), ipv6_str, INET6_ADDRSTRLEN);
inet_ntop(AF_INET6, ip.netmask().rawIpData(), nm_str, INET6_ADDRSTRLEN);
tap->picodev6 = new struct pico_device;
struct pico_ip6 ipaddr, netmask;
pico_string_to_ipv6(ipv6_str, ipaddr.addr);
pico_string_to_ipv6(nm_str, netmask.addr);
tap->picodev6->send = pico_eth_send; // tx
tap->picodev6->poll = pico_eth_poll; // rx
tap->picodev6->mtu = tap->_mtu;
tap->picodev6->tap = tap;
uint8_t mac[PICO_SIZE_ETH];
tap->_mac.copyTo(mac, PICO_SIZE_ETH);
if(pico_device_init(tap->picodev6, "p6", mac) != 0) {
DEBUG_ERROR("dev init failed");
delete tap->picodev6;
return false;
}
pico_ipv6_link_add(tap->picodev6, ipaddr, netmask);
DEBUG_INFO("addr6 = %s", ip.toString().c_str());
return true;
}
}
return false;
}
void picoTCP::pico_loop(SocketTap *tap)
{
while(tap->_run)
{
tap->_phy.poll(ZT_PHY_POLL_INTERVAL); // in ms
pico_stack_tick();
}
}
void picoTCP::pico_cb_tcp_read(ZeroTier::SocketTap *tap, struct pico_socket *s)
{
DEBUG_INFO();
Connection *conn = (Connection*)((ConnectionPair*)(s->priv))->conn;
if(conn) {
int r;
uint16_t port = 0;
union {
struct pico_ip4 ip4;
struct pico_ip6 ip6;
} peer;
do {
int avail = ZT_TCP_RX_BUF_SZ - conn->rxsz;
if(avail) {
r = pico_socket_recvfrom(s, conn->rxbuf + (conn->rxsz), ZT_SDK_MTU,
(void *)&peer.ip4.addr, &port);
//tap->_phy.setNotifyWritable(conn->sock, true);
if (r > 0)
conn->rxsz += r;
picostack->pico_Read(tap, conn->sock, conn, true);
DEBUG_INFO("r = %d, conn->rxsz=%d, conn=%p, conn->sock = %p", r, conn->rxsz, conn, conn->sock);
}
else
DEBUG_ERROR("not enough space left on I/O RX buffer for pico_socket(%p)", s);
}
while(r > 0);
return;
}
DEBUG_ERROR("invalid connection");
}
void picoTCP::pico_cb_udp_read(SocketTap *tap, struct pico_socket *s)
{
DEBUG_INFO();
Connection *conn = (Connection*)((ConnectionPair*)(s->priv))->conn;
if(conn) {
uint16_t port = 0;
union {
struct pico_ip4 ip4;
struct pico_ip6 ip6;
} peer;
char tmpbuf[ZT_SDK_MTU];
unsigned char *addr_pos, *sz_pos, *payload_pos;
struct sockaddr_in addr_in;
addr_in.sin_addr.s_addr = peer.ip4.addr;
addr_in.sin_port = port;
// RX
int r = pico_socket_recvfrom(s, tmpbuf, ZT_SDK_MTU, (void *)&peer.ip4.addr, &port);
//DEBUG_FLOW(" [ RXBUF <- STACK] Receiving (%d) from stack, copying to receving buffer", r);
if(conn->rxsz == ZT_UDP_RX_BUF_SZ) { // if UDP buffer full
//DEBUG_FLOW(" [ RXBUF <- STACK] UDP RX buffer full. Discarding oldest payload segment");
memmove(conn->rxbuf, conn->rxbuf + ZT_SDK_MTU, ZT_UDP_RX_BUF_SZ - ZT_SDK_MTU);
addr_pos = conn->rxbuf + (ZT_UDP_RX_BUF_SZ - ZT_SDK_MTU); // TODO:
sz_pos = addr_pos + sizeof(struct sockaddr_storage);
conn->rxsz -= ZT_SDK_MTU;
}
else {
addr_pos = conn->rxbuf + conn->rxsz; // where we'll prepend the size of the address
sz_pos = addr_pos + sizeof(struct sockaddr_storage);
}
payload_pos = addr_pos + sizeof(struct sockaddr_storage) + sizeof(r);
memcpy(addr_pos, &addr_in, sizeof(struct sockaddr_storage));
memcpy(payload_pos, tmpbuf, r); // write payload to app's socket
// Adjust buffer size
if(r) {
conn->rxsz += ZT_SDK_MTU;
memcpy(sz_pos, &r, sizeof(r));
}
if (r < 0) {
DEBUG_ERROR("unable to read from picosock=%p", s);
}
tap->_rx_buf_m.unlock();
// TODO: Revisit logic
// FIXME: simplify
if(r)
tap->phyOnUnixWritable(conn->sock, NULL, true);
//DEBUG_EXTRA(" Copied onto rxbuf (%d) from stack socket", r);
return;
}
}
void picoTCP::pico_cb_tcp_write(SocketTap *tap, struct pico_socket *s)
{
DEBUG_INFO();
Connection *conn = (Connection*)((ConnectionPair*)(s->priv))->conn;
if(!conn) {
DEBUG_ERROR("invalid connection");
return;
}
if(!conn->txsz)
return;
// Only called from a locked context, no need to lock anything
if(conn->txsz > 0) {
int r, max_write_len = conn->txsz < ZT_SDK_MTU ? conn->txsz : ZT_SDK_MTU;
if((r = pico_socket_write(s, &conn->txbuf, max_write_len)) < 0) {
DEBUG_ERROR("unable to write to picosock=%p", s);
return;
}
int sz = (conn->txsz)-r;
if(sz)
memmove(&conn->txbuf, (conn->txbuf+r), sz);
conn->txsz -= r;
#if DEBUG_LEVEL >= MSG_TRANSFER
int max = conn->socket_type == SOCK_STREAM ? ZT_TCP_TX_BUF_SZ : ZT_UDP_TX_BUF_SZ;
DEBUG_TRANS("[ TCP TX -> STACK] :: {TX: %.3f%%, RX: %.3f%%, physock=%p} :: %d bytes",
(float)conn->txsz / (float)max, (float)conn->rxsz / max, conn->sock, r);
#endif
return;
}
}
void picoTCP::pico_cb_socket_activity(uint16_t ev, struct pico_socket *s)
{
DEBUG_INFO();
if(!(SocketTap*)((ConnectionPair*)(s->priv)))
return;
SocketTap *tap = (SocketTap*)((ConnectionPair*)(s->priv))->tap;
Connection *conn = (Connection*)((ConnectionPair*)(s->priv))->conn;
if(!tap || !conn) {
DEBUG_ERROR("invalid tap or conn");
return;
}
int err;
Mutex::Lock _l(tap->_tcpconns_m);
if(!conn) {
DEBUG_ERROR("invalid connection");
}
DEBUG_INFO("conn = %p", conn);
// accept()
if (ev & PICO_SOCK_EV_CONN) {
if(conn->state == ZT_SOCK_STATE_LISTENING)
{
uint32_t peer;
uint16_t port;
struct pico_socket *client_psock = pico_socket_accept(s, &peer, &port);
if(!client_psock) {
if(pico_err == PICO_ERR_EINVAL)
DEBUG_ERROR("pico_err = PICO_ERR_EINVAL");
if(pico_err == PICO_ERR_EAGAIN)
DEBUG_ERROR("pico_err = PICO_ERR_EAGAIN");
return;
}
// Create a new Connection and add it to the queue,
// some time in the future a call to zts_multiplex_accept() will pick up
// this new connection, add it to the connection list and return its
// Connection->sock to the application
Connection *newConn = new Connection();
newConn->socket_type = SOCK_STREAM;
newConn->picosock = client_psock;
newConn->tap = tap;
newConn->picosock->priv = new ConnectionPair(tap,newConn);
tap->_Connections.push_back(newConn);
conn->_AcceptedConnections.push(newConn);
// For I/O loop participation and referencing the PhySocket's parent Connection in callbacks
newConn->sock = tap->_phy.wrapSocket(newConn->sdk_fd, newConn);
/*
DEBUG_INFO("wrapping newConn->sdk_fd = %d", newConn->sdk_fd);
DEBUG_INFO(" newConn->app_fd = %d", newConn->app_fd);
DEBUG_INFO(" newConn->sock = %p", newConn->sock);
DEBUG_INFO(" conn = %p", conn);
DEBUG_INFO(" newConn = %p", newConn);
DEBUG_INFO(" oldConn->sock = %p", conn->sock);
*/
}
if(conn->state != ZT_SOCK_STATE_LISTENING) {
// set state so socket multiplexer logic will pick this up
conn->state = ZT_SOCK_STATE_UNHANDLED_CONNECTED;
}
}
if (ev & PICO_SOCK_EV_FIN) {
DEBUG_INFO("socket closed. exit normally. picosock=%p", s);
//pico_timer_add(2000, compare_results, NULL);
}
if (ev & PICO_SOCK_EV_ERR) {
if(pico_err == PICO_ERR_ECONNRESET) {
DEBUG_ERROR("PICO_ERR_ECONNRESET");
conn->state = PICO_ERR_ECONNRESET;
}
DEBUG_INFO("socket error received pico_err=%d, picosock=%p", pico_err, s);
}
if (ev & PICO_SOCK_EV_CLOSE) {
err = pico_socket_close(s);
DEBUG_INFO("socket closure = %d, picosock=%p", err, s);
// TODO: Verify closure logic is complete.
// TEST: Remote shutdowns
return;
}
// Read from picoTCP socket
if (ev & PICO_SOCK_EV_RD) {
if(conn->socket_type==SOCK_STREAM)
pico_cb_tcp_read(tap, s);
if(conn->socket_type==SOCK_DGRAM)
pico_cb_udp_read(tap, s);
}
// Write to picoTCP socket
if (ev & PICO_SOCK_EV_WR)
pico_cb_tcp_write(tap, s);
}
int pico_eth_send(struct pico_device *dev, void *buf, int len)
{
DEBUG_INFO();
SocketTap *tap = (SocketTap*)(dev->tap);
if(!tap) {
DEBUG_ERROR("invalid dev->tap");
return ZT_ERR_GENERAL_FAILURE;
}
struct pico_eth_hdr *ethhdr;
ethhdr = (struct pico_eth_hdr *)buf;
MAC src_mac;
MAC dest_mac;
src_mac.setTo(ethhdr->saddr, 6);
dest_mac.setTo(ethhdr->daddr, 6);
tap->_handler(tap->_arg,NULL,tap->_nwid,src_mac,dest_mac,
Utils::ntoh((uint16_t)ethhdr->proto),0, ((char*)buf) + sizeof(struct pico_eth_hdr),len - sizeof(struct pico_eth_hdr));
DEBUG_INFO("len = %d", len);
return len;
}
void picoTCP::pico_rx(SocketTap *tap, const MAC &from,const MAC &to,unsigned int etherType,
const void *data,unsigned int len)
{
DEBUG_INFO();
if(!tap) {
DEBUG_ERROR("invalid tap");
return;
}
// Since picoTCP only allows the reception of frames from within the polling function, we
// must enqueue each frame into a memory structure shared by both threads. This structure will
Mutex::Lock _l(tap->_pico_frame_rxbuf_m);
// assemble new eth header
struct pico_eth_hdr ethhdr;
from.copyTo(ethhdr.saddr, 6);
to.copyTo(ethhdr.daddr, 6);
ethhdr.proto = Utils::hton((uint16_t)etherType);
int newlen = len + sizeof(int) + sizeof(struct pico_eth_hdr);
int mylen;
// FIXME
while(newlen > (MAX_PICO_FRAME_RX_BUF_SZ-tap->pico_frame_rxbuf_tot) && ethhdr.proto == 56710)
{
mylen = 0;
memset(tap->pico_frame_rxbuf,0,MAX_PICO_FRAME_RX_BUF_SZ);
tap->pico_frame_rxbuf_tot=0;
}
memcpy(tap->pico_frame_rxbuf + tap->pico_frame_rxbuf_tot, &newlen, sizeof(newlen)); // size of frame + meta
memcpy(tap->pico_frame_rxbuf + tap->pico_frame_rxbuf_tot + sizeof(newlen), &ethhdr, sizeof(ethhdr)); // new eth header
memcpy(tap->pico_frame_rxbuf + tap->pico_frame_rxbuf_tot + sizeof(newlen) + sizeof(ethhdr), data, len); // frame data
tap->pico_frame_rxbuf_tot += newlen;
//DEBUG_FLOW("[ ZWIRE -> FBUF ] Move FRAME(sz=%d) into FBUF(sz=%d), data_len=%d", newlen, tap->pico_frame_rxbuf_tot, len);
}
int pico_eth_poll(struct pico_device *dev, int loop_score)
{
SocketTap *tap = (SocketTap*)(dev->tap);
if(!tap) {
DEBUG_ERROR("invalid dev->tap");
return ZT_ERR_GENERAL_FAILURE;
}
// FIXME: The copy logic and/or buffer structure should be reworked for better performance after the BETA
// SocketTap *tap = (SocketTap*)netif->state;
Mutex::Lock _l(tap->_pico_frame_rxbuf_m);
unsigned char frame[ZT_SDK_MTU];
int len;
int err;
while (tap->pico_frame_rxbuf_tot > 0 && loop_score > 0) {
//DEBUG_FLOW(" [ FBUF -> STACK] Frame buffer SZ=%d", tap->pico_frame_rxbuf_tot);
memset(frame, 0, sizeof(frame));
len = 0;
memcpy(&len, tap->pico_frame_rxbuf, sizeof(len)); // get frame len
if(len >= 0) {
//DEBUG_FLOW(" [ FBUF -> STACK] Moving FRAME of size (%d) from FBUF(sz=%d) into stack",len, tap->pico_frame_rxbuf_tot-len);
memcpy(frame, tap->pico_frame_rxbuf + sizeof(len), len-(sizeof(len)) ); // get frame data
memmove(tap->pico_frame_rxbuf, tap->pico_frame_rxbuf + len, MAX_PICO_FRAME_RX_BUF_SZ-len); // shift buffer
err = pico_stack_recv(dev, (uint8_t*)frame, (len-sizeof(len)));
//DEBUG_INFO("recv = %d", err);
tap->pico_frame_rxbuf_tot-=len;
}
else {
DEBUG_ERROR("Invalid frame size (%d). Exiting.",len);
zt_dump_stacktrace(0);
}
loop_score--;
}
return loop_score;
}
int picoTCP::pico_Connect(Connection *conn, int fd, const struct sockaddr *addr, socklen_t addrlen)
{
if(!conn || !conn->picosock) {
DEBUG_ERROR("invalid conn or conn->picosock");
return ZT_ERR_GENERAL_FAILURE;
}
int err = 0;
#if defined(SDK_IPV4)
struct pico_ip4 zaddr;
struct sockaddr_in *in4 = (struct sockaddr_in*)addr;
char ipv4_str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, (const void *)&in4->sin_addr.s_addr, ipv4_str, INET_ADDRSTRLEN);
pico_string_to_ipv4(ipv4_str, &(zaddr.addr));
DEBUG_ATTN("addr=%s:%d", ipv4_str, Utils::ntoh( in4->sin_port ));
err = pico_socket_connect(conn->picosock, &zaddr, in4->sin_port);
DEBUG_INFO("connect_err = %d", err);
#elif defined(SDK_IPV6)
struct pico_ip6 zaddr;
struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
char ipv6_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &(in6->sin6_addr), ipv6_str, INET6_ADDRSTRLEN);
pico_string_to_ipv6(ipv6_str, zaddr.addr);
DEBUG_ATTN("addr=%s:%d", ipv6_str, Utils::ntoh(in6->sin6_port));
err = pico_socket_connect(conn->picosock, &zaddr, in6->sin6_port);
#endif
memcpy(&(conn->peer_addr), &addr, sizeof(struct sockaddr_storage));
if(err == PICO_ERR_EPROTONOSUPPORT)
DEBUG_ERROR("PICO_ERR_EPROTONOSUPPORT");
if(err == PICO_ERR_EINVAL)
DEBUG_ERROR("PICO_ERR_EINVAL");
if(err == PICO_ERR_EHOSTUNREACH)
DEBUG_ERROR("PICO_ERR_EHOSTUNREACH");
return err;
}
int picoTCP::pico_Bind(Connection *conn, int fd, const struct sockaddr *addr, socklen_t addrlen)
{
DEBUG_INFO();
if(!conn || !conn->picosock) {
DEBUG_ERROR("invalid conn or conn->picosock");
return ZT_ERR_GENERAL_FAILURE;
}
int err = 0;
#if defined(SDK_IPV4)
struct pico_ip4 zaddr;
struct sockaddr_in *in4 = (struct sockaddr_in*)addr;
char ipv4_str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, (const void *)&in4->sin_addr.s_addr, ipv4_str, INET_ADDRSTRLEN);
pico_string_to_ipv4(ipv4_str, &(zaddr.addr));
// DEBUG_ATTN("addr=%s: %d ntoh()=%d", ipv4_str, in4->sin_port, Utils::ntoh(in4->sin_port));
err = pico_socket_bind(conn->picosock, &zaddr, (uint16_t *)&(in4->sin_port));
#endif
#if defined(SDK_IPV6)
struct pico_ip6 pip6;
struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
char ipv6_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &(in6->sin6_addr), ipv6_str, INET6_ADDRSTRLEN);
// TODO: This isn't proper
pico_string_to_ipv6("::", pip6.addr);
//DEBUG_ATTN("addr=%s:%d, picosock=%p", ipv6_str, Utils::ntoh(in6->sin6_port), (conn->picosock));
err = pico_socket_bind(conn->picosock, &pip6, (uint16_t *)&(in6->sin6_port));
#endif
if(err < 0) {
if(pico_err < 0)
DEBUG_ERROR("pico_err = %d", pico_err);
DEBUG_ERROR("unable to bind pico_socket(%p), err=%d", (conn->picosock), err);
if(err == PICO_ERR_EINVAL) {
DEBUG_ERROR("PICO_ERR_EINVAL - invalid argument");
errno = EINVAL;
return -1;
}
if(err == PICO_ERR_ENOMEM) {
DEBUG_ERROR("PICO_ERR_ENOMEM - not enough space");
errno = ENOMEM;
return -1;
}
if(err == PICO_ERR_ENXIO) {
DEBUG_ERROR("PICO_ERR_ENXIO - no such device or address");
errno = ENXIO;
return -1;
}
}
return err;
}
int picoTCP::pico_Listen(Connection *conn, int fd, int backlog)
{
DEBUG_INFO();
if(!conn || !conn->picosock) {
DEBUG_ERROR("invalid conn or conn->picosock");
return ZT_ERR_GENERAL_FAILURE;
}
int err;
if((err = pico_socket_listen(conn->picosock, backlog)) < 0)
{
if(err == PICO_ERR_EINVAL) {
DEBUG_ERROR("PICO_ERR_EINVAL");
errno = EINVAL;
return -1;
}
if(err == PICO_ERR_EISCONN) {
DEBUG_ERROR("PICO_ERR_EISCONN");
errno = EISCONN;
return -1;
}
}
conn->state = ZT_SOCK_STATE_LISTENING;
return ZT_ERR_OK;
}
Connection* picoTCP::pico_Accept(Connection *conn)
{
if(!conn) {
DEBUG_ERROR("invalid conn");
return NULL;
}
// Retreive first of queued Connections from parent connection
Connection *new_conn = NULL;
if(conn->_AcceptedConnections.size()) {
new_conn = conn->_AcceptedConnections.front();
conn->_AcceptedConnections.pop();
}
return new_conn;
}
void picoTCP::pico_Read(SocketTap *tap, PhySocket *sock, Connection* conn, bool stack_invoked)
{
if(!conn || !tap || !conn) {
DEBUG_ERROR("invalid tap, sock, or conn");
return;
}
DEBUG_INFO();
if(!stack_invoked) {
// The stack thread writes to RXBUF as well
tap->_tcpconns_m.lock();
tap->_rx_buf_m.lock();
}
int tot = 0, n = -1, write_attempts = 0;
if(conn && conn->rxsz) {
DEBUG_INFO("conn = %p", conn);
//
if(conn->socket_type==SOCK_DGRAM) {
// Try to write ZT_SDK_MTU-sized chunk to app socket
while(tot < ZT_SDK_MTU) {
write_attempts++;
n = tap->_phy.streamSend(conn->sock, (conn->rxbuf)+tot, ZT_SDK_MTU);
tot += n;
DEBUG_FLOW("[ ZTSOCK <- RXBUF] wrote = %d, errno=%d", n, errno);
// If socket is unavailable, attempt to write N times before giving up
if(errno==35) {
if(write_attempts == 1024) {
n = ZT_SDK_MTU; // say we wrote it, even though we didn't (drop packet)
tot = ZT_SDK_MTU;
}
}
}
int payload_sz, addr_sz_offset = sizeof(struct sockaddr_storage);
memcpy(&payload_sz, conn->rxbuf + addr_sz_offset, sizeof(int));
struct sockaddr_storage addr;
memcpy(&addr, conn->rxbuf, addr_sz_offset);
// adjust buffer
if(conn->rxsz-n > 0) { // If more remains on buffer
memcpy(conn->rxbuf, conn->rxbuf+ZT_SDK_MTU, conn->rxsz - ZT_SDK_MTU);
}
conn->rxsz -= ZT_SDK_MTU;
}
//
if(conn->socket_type==SOCK_STREAM) {
DEBUG_INFO("writing to conn->sock = %p, conn->sdk_fd=%d, conn->app_fd=%d", conn->sock, conn->sdk_fd, conn->app_fd);
n = tap->_phy.streamSend(conn->sock, conn->rxbuf, conn->rxsz);
// FIXME: Revisit the idea of writing directly to the app socketpair instead of using Phy I/O
// n = write(conn->sdk_fd, conn->rxbuf, conn->rxsz);
if(conn->rxsz-n > 0) // If more remains on buffer
memcpy(conn->rxbuf, conn->rxbuf+n, conn->rxsz - n);
conn->rxsz -= n;
}
// Notify ZT I/O loop that it has new buffer contents
if(n) {
if(conn->socket_type==SOCK_STREAM) {
#if DEBUG_LEVEL >= MSG_TRANSFER
float max = conn->socket_type == SOCK_STREAM ? (float)ZT_TCP_RX_BUF_SZ : (float)ZT_UDP_RX_BUF_SZ;
DEBUG_TRANS("[ TCP RX <- STACK] :: {TX: %.3f%%, RX: %.3f%%, physock=%p} :: %d bytes",
(float)conn->txsz / max, (float)conn->rxsz / max, conn->sock, n);
#endif
}
if(conn->rxsz == 0) {
tap->_phy.setNotifyWritable(sock, false);
}
else {
tap->_phy.setNotifyWritable(sock, true);
}
}
else {
tap->_phy.setNotifyWritable(sock, false);
}
}
if(!stack_invoked) {
tap->_tcpconns_m.unlock();
tap->_rx_buf_m.unlock();
}
// DEBUG_FLOW("[ ZTSOCK <- RXBUF] Emitted (%d) from RXBUF(%d) to socket", tot, conn->rxsz);
}
void picoTCP::pico_Write(Connection *conn, void *data, ssize_t len)
{
unsigned char *buf = (unsigned char*)data;
memcpy(conn->txbuf + conn->txsz, buf, len);
conn->txsz += len;
DEBUG_INFO("conn = %p, conn->picosock = %p", conn, conn->picosock);
if(!conn || !conn->picosock) {
DEBUG_ERROR("invalid conn or conn->picosock");
return;
}
int max, r, max_write_len = conn->txsz < ZT_SDK_MTU ? conn->txsz : ZT_SDK_MTU;
if((r = pico_socket_write(conn->picosock, &conn->txbuf, max_write_len)) < 0) {
DEBUG_ERROR("unable to write to picosock=%p, r=%d", conn->picosock, r);
return;
}
// adjust buffer
int sz = (conn->txsz)-r;
if(sz)
memmove(&conn->txbuf, (conn->txbuf+r), sz);
conn->txsz -= r;
if(conn->socket_type == SOCK_STREAM) {
max = ZT_TCP_TX_BUF_SZ;
DEBUG_TRANS("[ TCP TX -> STACK] :: {TX: %.3f%%, RX: %.3f%%, physock=%p} :: %d bytes",
(float)conn->txsz / (float)max, (float)conn->rxsz / max, conn->sock, r);
}
if(conn->socket_type == SOCK_DGRAM) {
max = ZT_UDP_TX_BUF_SZ;
DEBUG_TRANS("[ UDP TX -> STACK] :: {TX: %.3f%%, RX: %.3f%%, physock=%p} :: %d bytes",
(float)conn->txsz / (float)max, (float)conn->rxsz / max, conn->sock, r);
}
}
int picoTCP::pico_Close(Connection *conn)
{
DEBUG_INFO();
if(!conn || !conn->picosock)
return ZT_ERR_GENERAL_FAILURE;
int err;
if(conn->picosock->state | PICO_SOCKET_STATE_CLOSED)
return ZT_ERR_OK;
if((err = pico_socket_close(conn->picosock)) < 0) {
errno = pico_err;
DEBUG_ERROR("error closing pico_socket(%p)", (void*)(conn->picosock));
return err;
}
return -1;
}
}