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boinc/client/net_xfer.C

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// The contents of this file are subject to the BOINC Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://boinc.berkeley.edu/license_1.0.txt
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
//
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002
// University of California at Berkeley. All Rights Reserved.
//
// Contributor(s):
//
#include "cpp.h"
#include <stdio.h>
#include <math.h>
#ifdef _WIN32
#include <afxwin.h>
#include <winsock.h>
#include "Win_net.h"
#include "wingui_mainwindow.h"
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include "error_numbers.h"
#include "net_xfer.h"
#include "util.h"
#include "client_types.h"
#include "client_state.h"
#include "message.h"
#ifdef _WIN32
typedef int socklen_t;
#elif !GETSOCKOPT_SOCKLEN_T
typedef size_t socklen_t;
#endif
int get_socket_error(int fd) {
socklen_t intsize = sizeof(int);
int n;
#ifdef _WIN32
getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *)&n, &intsize);
#elif __APPLE__
getsockopt(fd, SOL_SOCKET, SO_ERROR, &n, (int *)&intsize);
#else
getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&n, &intsize);
#endif
return n;
}
int NET_XFER::get_ip_addr(char *hostname, int &ip_addr) {
hostent* hep;
#ifdef _WIN32
int retval;
retval = NetOpen();
if (retval) return retval;
#endif
hep = gethostbyname(hostname);
if (!hep) {
char msg[256];
int n;
n = sprintf(msg, "Can't resolve hostname %s ", hostname);
#ifdef _WIN32
switch (WSAGetLastError()) {
case WSANOTINITIALISED:
break;
case WSAENETDOWN:
sprintf(msg+n, "(the network subsystem has failed)");
break;
case WSAHOST_NOT_FOUND:
sprintf(msg+n, "(host name not found)");
break;
case WSATRY_AGAIN:
sprintf(msg+n, "(no response from server)");
break;
case WSANO_RECOVERY:
sprintf(msg+n, "(a nonrecoverable error occurred)");
break;
case WSANO_DATA:
sprintf(msg+n, "(valid name, no data record of requested type)");
break;
case WSAEINPROGRESS:
sprintf(msg+n, "(a blocking socket call in progress)");
break;
case WSAEFAULT:
sprintf(msg+n, "(invalid part of user address space)");
break;
case WSAEINTR:
sprintf(msg+n, "(a blocking socket call was canceled)");
break;
}
NetClose();
#else
switch (h_errno) {
case HOST_NOT_FOUND:
sprintf(msg+n, "(host not found)");
break;
case NO_DATA:
sprintf(msg+n, "(valid name, no data record of requested type)");
break;
case NO_RECOVERY:
sprintf(msg+n, "(a nonrecoverable error occurred)");
break;
case TRY_AGAIN:
sprintf(msg+n, "(host not found or server failure)");
break;
}
#endif
msg_printf(0, MSG_ERROR, "%s\n", msg);
return ERR_GETHOSTBYNAME;
}
ip_addr = *(int*)hep->h_addr_list[0];
return 0;
}
// Attempt to open a nonblocking socket to a server
//
int NET_XFER::open_server() {
sockaddr_in addr;
int fd=0, ipaddr, retval=0;
retval = get_ip_addr(hostname, ipaddr);
if (retval) return retval;
fd = ::socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
#ifdef _WIN32
NetClose();
#endif
return ERR_SOCKET;
}
#ifdef _WIN32
unsigned long one = 1;
ioctlsocket(fd, FIONBIO, &one);
#else
int flags;
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
return ERR_FCNTL;
}
if (fcntl(fd, F_SETFL, flags|O_NONBLOCK) < 0 ) {
return ERR_FCNTL;
}
#endif
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = ((long)ipaddr);
retval = connect(fd, (sockaddr*)&addr, sizeof(addr));
if (retval) {
#ifdef _WIN32
errno = WSAGetLastError();
if (errno != WSAEINPROGRESS && errno != WSAEWOULDBLOCK) {
closesocket(fd);
NetClose();
return ERR_CONNECT;
}
#ifndef WIN_CLI
if (WSAAsyncSelect( fd, g_myWnd->GetSafeHwnd(), g_myWnd->m_nNetActivityMsg, FD_READ|FD_WRITE )) {
errno = WSAGetLastError();
if (errno != WSAEINPROGRESS && errno != WSAEWOULDBLOCK) {
closesocket(fd);
NetClose();
return ERR_ASYNCSELECT;
}
}
#endif
#else
if (errno != EINPROGRESS) {
close(fd);
perror("connect");
return ERR_CONNECT;
}
#endif
} else {
is_connected = true;
}
socket = fd;
return 0;
}
void NET_XFER::close_socket() {
#ifdef _WIN32
NetClose();
if (socket) closesocket(socket);
#else
if (socket) close(socket);
#endif
}
void NET_XFER::init(char* host, int p, int b) {
socket = -1;
is_connected = false;
want_download = false;
want_upload = false;
do_file_io = false;
io_done = false;
file = NULL;
io_ready = false;
error = 0;
safe_strcpy(hostname, host);
port = p;
blocksize = (b > MAX_BLOCKSIZE ? MAX_BLOCKSIZE : b);
xfer_speed = 0;
recent_bytes = 0;
last_speed_update = 0;
file_read_buf_offset = 0;
file_read_buf_len = 0;
bytes_xferred = 0;
}
NET_XFER_SET::NET_XFER_SET() {
max_bytes_sec_up = 0;
max_bytes_sec_down = 0;
bytes_left_up = 0;
bytes_left_down = 0;
bytes_up = 0;
bytes_down = 0;
up_active = false;
down_active = false;
}
// Insert a NET_XFER object into the set
//
int NET_XFER_SET::insert(NET_XFER* nxp) {
int retval = nxp->open_server();
if (retval) return retval;
net_xfers.push_back(nxp);
return 0;
}
// Remove a NET_XFER object from the set
//
int NET_XFER_SET::remove(NET_XFER* nxp) {
vector<NET_XFER*>::iterator iter;
nxp->close_socket();
iter = net_xfers.begin();
while (iter != net_xfers.end()) {
if (*iter == nxp) {
net_xfers.erase(iter);
return 0;
}
iter++;
}
msg_printf(NULL, MSG_ERROR, "NET_XFER_SET::remove(): not found\n");
return 1;
}
// Transfer data to/from active sockets.
// Keep doing I/O until would block, or we hit rate limits,
// or about .5 second goes by
//
bool NET_XFER_SET::poll() {
double bytes_xferred;
int retval;
time_t t = time(0);
bool action = false;
while (1) {
retval = do_select(bytes_xferred, 0);
if (retval) break;
if (bytes_xferred == 0) break;
action = true;
if (time(0) != t) break;
}
return action;
}
static void double_to_timeval(double x, timeval& t) {
t.tv_sec = (int)x;
t.tv_usec = (int)(1000000*(x - (int)x));
}
// Wait at most x seconds for network I/O to become possible,
// then do up to about .5 seconds of I/O.
//
int NET_XFER_SET::net_sleep(double x) {
int retval;
double bytes_xferred;
retval = do_select(bytes_xferred, x);
if (retval) return retval;
if (bytes_xferred) {
return poll();
}
return 0;
}
// do a select with the given timeout,
// then do I/O on as many sockets as possible, subject to rate limits
// Transfer at most one block per socket.
//
int NET_XFER_SET::do_select(double& bytes_transferred, double timeout) {
int n, fd, retval, nsocks_queried;
socklen_t i;
NET_XFER *nxp;
struct timeval tv;
ScopeMessages scope_messages(log_messages, ClientMessages::DEBUG_NET_XFER);
// if a second has gone by, do rate-limit accounting
//
time_t t = time(0);
if (t != last_time) {
last_time = t;
if (bytes_left_up < max_bytes_sec_up) {
bytes_left_up += max_bytes_sec_up;
}
if (bytes_left_down < max_bytes_sec_down) {
bytes_left_down += max_bytes_sec_down;
}
}
bytes_transferred = 0;
fd_set read_fds, write_fds, error_fds;
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
FD_ZERO(&error_fds);
// do a select on all active (non-throttled) sockets
//
nsocks_queried = 0;
for (i=0; i<net_xfers.size(); i++) {
nxp = net_xfers[i];
if (!nxp->is_connected) {
FD_SET(nxp->socket, &write_fds);
nsocks_queried++;
} else if (nxp->want_download) {
if (bytes_left_down > 0) {
FD_SET(nxp->socket, &read_fds);
nsocks_queried++;
} else {
scope_messages.printf("NET_XFER_SET::do_select(): Throttling download\n");
}
} else if (nxp->want_upload) {
if (bytes_left_up > 0) {
FD_SET(nxp->socket, &write_fds);
nsocks_queried++;
} else {
scope_messages.printf("NET_XFER_SET::do_select(): Throttling upload\n");
}
}
FD_SET(nxp->socket, &error_fds);
}
if (nsocks_queried==0) {
boinc_sleep(timeout);
return 0;
}
double_to_timeval(timeout, tv);
n = select(FD_SETSIZE, &read_fds, &write_fds, &error_fds, &tv);
scope_messages.printf(
"NET_XFER_SET::do_select(): queried %d, returned %d\n",
nsocks_queried, n
);
if (n == 0) return 0;
if (n < 0) return ERR_SELECT;
// if got a descriptor, find the first one in round-robin order
// and do I/O on it
// TODO: use round-robin order
//
for (i=0; i<net_xfers.size(); i++) {
nxp = net_xfers[i];
fd = nxp->socket;
if (FD_ISSET(fd, &read_fds) || FD_ISSET(fd, &write_fds)) {
if (FD_ISSET(fd, &read_fds)) {
scope_messages.printf("NET_XFER_SET::do_select(): read enabled on socket %d\n", fd);
}
if (FD_ISSET(fd, &write_fds)) {
scope_messages.printf("NET_XFER_SET::do_select(): write enabled on socket %d\n", fd);
}
if (!nxp->is_connected) {
n = get_socket_error(fd);
if (n) {
scope_messages.printf(
"NET_XFER_SET::do_select(): socket %d connection to %s failed\n",
fd, nxp->hostname
);
nxp->error = ERR_CONNECT;
nxp->io_done = true;
} else {
scope_messages.printf("NET_XFER_SET::do_select(): socket %d is connected\n", fd);
nxp->is_connected = true;
bytes_transferred += 1;
}
} else if (nxp->do_file_io) {
n = 1;
time_t now = time(0);
do {
retval = nxp->do_xfer(n);
nxp->update_speed(n);
bytes_transferred += n;
if (nxp->want_download) {
down_active = true;
bytes_left_down -= n;
bytes_down += n;
} else {
up_active = true;
bytes_left_up -= n;
bytes_up += n;
}
// For uploads, keep trying to send until we fill
// the buffers or 1 second has passed
} while(nxp->want_upload && n > 0 && time(0) == now);
} else {
nxp->io_ready = true;
}
} else if (FD_ISSET(fd, &error_fds)) {
scope_messages.printf("NET_XFER_SET::do_select(): got error on socket %d\n", fd);
nxp = lookup_fd(fd);
if (nxp) {
nxp->got_error();
} else {
msg_printf(0, MSG_ERROR, "do_select(): nxp not found\n");
}
}
}
return 0;
}
// Return the NET_XFER object whose socket matches fd
//
NET_XFER* NET_XFER_SET::lookup_fd(int fd) {
for (unsigned int i=0; i<net_xfers.size(); i++) {
if (net_xfers[i]->socket == fd) {
return net_xfers[i];
}
}
return 0;
}
// transfer up to a block of data; return #bytes transferred
//
int NET_XFER::do_xfer(int& nbytes_transferred) {
// Leave these as signed ints so recv/send can return errors
int n, m, nleft;
bool would_block;
char buf[MAX_BLOCKSIZE];
nbytes_transferred = 0;
ScopeMessages scope_messages(log_messages, ClientMessages::DEBUG_NET_XFER);
if (want_download) {
#ifdef _WIN32
n = recv(socket, buf, blocksize, 0);
#else
n = read(socket, buf, blocksize);
#endif
scope_messages.printf("NET_XFER::do_xfer(): read %d bytes from socket %d\n", n, socket);
if (n == 0) {
io_done = true;
want_download = false;
} else if (n < 0) {
io_done = true;
error = ERR_READ;
} else {
nbytes_transferred += n;
bytes_xferred += n;
m = fwrite(buf, 1, n, file);
if (n != m) {
fprintf(stdout, "Error: incomplete disk write\n");
io_done = true;
error = ERR_FWRITE;
}
}
} else if (want_upload) {
// If we've sent the current contents of
// the buffer, then read the next block
if (file_read_buf_len == file_read_buf_offset) {
m = fread(file_read_buf, 1, blocksize, file);
if (m == 0) {
want_upload = false;
io_done = true;
return 0;
} else if (m < 0) {
io_done = true;
error = ERR_FREAD;
return 0;
}
file_read_buf_len = m;
file_read_buf_offset = 0;
}
nleft = file_read_buf_len - file_read_buf_offset;
while (nleft) {
#ifdef _WIN32
n = send(socket, file_read_buf+file_read_buf_offset, nleft, 0);
would_block = (WSAGetLastError() == WSAEWOULDBLOCK);
#else
n = write(socket, file_read_buf+file_read_buf_offset, nleft);
would_block = (errno == EAGAIN);
#endif
if (would_block && n < 0) n = 0;
scope_messages.printf("NET_XFER::do_xfer(): wrote %d bytes to socket %d%s\n", n, socket,
(would_block?", would have blocked":""));
if (n < 0 && !would_block) {
error = ERR_WRITE;
io_done = true;
break;
}
file_read_buf_offset += n;
nbytes_transferred += n;
bytes_xferred += n;
if (n < nleft || would_block) {
break;
}
nleft -= n;
}
}
return 0;
}
// Update the transfer speed for this NET_XFER
// Decay speed by 1/2 every 3 seconds
//
void NET_XFER::update_speed(int nbytes) {
time_t now, delta_t;
double x;
now = time(0);
recent_bytes += nbytes;
if (last_speed_update==0) last_speed_update = now;
delta_t = now-last_speed_update;
if (delta_t<=0) return;
x = exp(-delta_t*log(2.0)/3.0);
xfer_speed *= x;
xfer_speed += recent_bytes*(1-x);
last_speed_update = now;
recent_bytes = 0;
}
void NET_XFER::got_error() {
error = ERR_IO;
io_done = true;
log_messages.printf(ClientMessages::DEBUG_NET_XFER,
"IO error on socket %d\n", socket);
}
// return true if an upload is currently in progress
// or has been since the last call to this.
// Similar for download.
//
void NET_XFER_SET::check_active(bool& up, bool& down) {
unsigned int i;
NET_XFER* nxp;
up = up_active;
down = down_active;
for (i=0; i<net_xfers.size(); i++) {
nxp = net_xfers[i];
if (nxp->is_connected && nxp->do_file_io) {
nxp->want_download?down=true:up=true;
}
}
up_active = false;
down_active = false;
}
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