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boinc/client/net_xfer.C

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// The contents of this file are subject to the Mozilla 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://www.mozilla.org/MPL/
//
// 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 "windows_cpp.h"
#include <stdio.h>
#ifdef _WIN32
#include "winsock.h"
#else
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <unistd.h>
#endif
#include <sys/types.h>
//#include <sys/ioctl.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include "error_numbers.h"
#include "log_flags.h"
#include "net_xfer.h"
// On Macs, socklen_t isn't defined in a header file so we have to define it here
#ifdef mac
#define socklen_t unsigned int
#endif
// The other option is that the socket functions require size_t instead
#if !defined(socklen_t)
#define socklen_t size_t
#endif
int NET_XFER::open_server() {
sockaddr_in addr;
hostent* hep;
int fd=0, ipaddr, retval=0;
hep = gethostbyname(hostname);
if (!hep) {
fprintf(stderr, "can't resolve hostname %s\n", hostname);
return ERR_GETHOSTBYNAME;
}
ipaddr = *(int*)hep->h_addr_list[0];
if (retval) return -1;
fd = ::socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) return -1;
#ifdef _WIN32
unsigned long one = 1;
ioctlsocket(fd, FIONBIO, &one);
#else
int flags;
//ioctl(fd, FIONBIO, &one);
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) return -1;
else if( fcntl(fd, F_SETFL, flags|O_NONBLOCK) < 0 ) return -1;
#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
if (errno != WSAEINPROGRESS) {
closesocket(fd);
return -1;
}
#else
if (errno != EINPROGRESS) {
close(fd);
return -1;
}
#endif
} else {
is_connected = true;
}
socket = fd;
return 0;
}
void NET_XFER::init(char* host, int p, int b) {
strcpy(hostname, host);
port = p;
is_connected = false;
want_download = false;
want_upload = false;
do_file_io = false;
io_done = false;
io_ready = false;
error = 0;
blocksize = b;
}
int NET_XFER_SET::insert(NET_XFER* nxp) {
int retval = nxp->open_server();
if (retval) return retval;
net_xfers.push_back(nxp);
return 0;
}
int NET_XFER_SET::remove(NET_XFER* nxp) {
vector<NET_XFER*>::iterator iter;
#ifdef _WIN32
if (nxp->socket) closesocket(nxp->socket);
#else
if (nxp->socket) close(nxp->socket);
#endif
iter = net_xfers.begin();
while (iter != net_xfers.end()) {
if (*iter == nxp) {
net_xfers.erase(iter);
return 0;
}
iter++;
}
fprintf(stderr, "NET_XFER_SET::remove(): not found\n");
return 1;
}
// transfer data to/from a list of active streams
// transfer at most max_bytes bytes.
//
int NET_XFER_SET::poll(int max_bytes, int& bytes_transferred) {
int n, retval;
bytes_transferred = 0;
while (1) {
retval = do_select(max_bytes, n);
if (retval) return retval;
if (n == 0) break;
max_bytes -= n;
bytes_transferred += n;
if (max_bytes < 0) break;
}
return 0;
}
// do a select and do I/O on as many sockets as possible.
//
int NET_XFER_SET::do_select(int max_bytes, int& bytes_transferred) {
struct timeval zeros;
int n, fd, retval;
socklen_t i;
NET_XFER *nxp;
#if GETSOCKOPT_SIZE_T
size_t intsize = sizeof(int);
#elif GETSOCKOPT_SOCKLEN_T
socklen_t intsize = sizeof(int);
#else
//int intsize = sizeof(int);
socklen_t intsize = sizeof(int);
#endif
bytes_transferred = 0;
fd_set read_fds, write_fds, error_fds;
memset(&zeros, 0, sizeof(zeros));
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
FD_ZERO(&error_fds);
// do a select on all active streams
//
for (i=0; i<net_xfers.size(); i++) {
nxp = net_xfers[i];
if (!nxp->is_connected) {
FD_SET(net_xfers[i]->socket, &write_fds);
} else if (net_xfers[i]->want_download) {
FD_SET(net_xfers[i]->socket, &read_fds);
} else if (net_xfers[i]->want_upload) {
FD_SET(net_xfers[i]->socket, &write_fds);
}
FD_SET(net_xfers[i]->socket, &error_fds);
}
n = select(FD_SETSIZE, &read_fds, &write_fds, &error_fds, &zeros);
if (log_flags.net_xfer_debug) printf("select returned %d\n", 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
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 (!nxp->is_connected) {
#ifdef _WIN32
getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *)&n, (int *)&intsize);
#else
getsockopt(fd, SOL_SOCKET, SO_ERROR, &n, (int *)&intsize);
#endif
if (n) {
if (log_flags.net_xfer_debug) {
printf("socket %d connect failed\n", fd);
}
nxp->error = ERR_CONNECT;
nxp->io_done = true;
} else {
if (log_flags.net_xfer_debug) {
printf("socket %d is connected\n", fd);
}
nxp->is_connected = true;
bytes_transferred += 1;
}
} else if (nxp->do_file_io) {
if (max_bytes > 0) {
retval = nxp->do_xfer(n);
max_bytes -= n;
bytes_transferred += n;
}
} else {
nxp->io_ready = true;
}
} else if (FD_ISSET(fd, &error_fds)) {
if (log_flags.net_xfer_debug) printf("got error on socket %d\n", fd);
nxp = lookup_fd(fd);
nxp->got_error();
}
}
return 0;
}
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) {
int n, m, nleft, offset;
char* buf = (char*)malloc(blocksize);
nbytes_transferred = 0;
if (!buf) return ERR_MALLOC;
if (want_download) {
#ifdef _WIN32
n = recv(socket, buf, blocksize, 0);
#else
n = read(socket, buf, blocksize);
#endif
if (log_flags.net_xfer_debug) {
printf("read %d bytes from socket %d\n", n, socket);
}
if (n == 0) {
io_done = true;
want_download = false;
goto done;
} else if (n < 0) {
io_done = true;
error = ERR_READ;
goto done;
} else {
nbytes_transferred += n;
m = fwrite(buf, 1, n, file);
if (n != m) {
io_done = true;
error = ERR_FWRITE;
goto done;
}
}
} else if (want_upload) {
m = fread(buf, 1, blocksize, file);
if (m == 0) {
want_upload = false;
io_done = true;
goto done;
} else if (m < 0) {
io_done = true;
error = ERR_FREAD;
goto done;
}
nleft = m;
offset = 0;
while (nleft) {
#ifdef _WIN32
n = send(socket, buf+offset, nleft, 0);
#else
n = write(socket, buf+offset, nleft);
#endif
if (log_flags.net_xfer_debug) {
printf("wrote %d bytes to socket %d\n", n, socket);
}
if (n < 0) {
error = ERR_WRITE;
io_done = true;
goto done;
}
nleft -= n;
offset += n;
nbytes_transferred += n;
}
}
done:
free(buf);
return 0;
}
void NET_XFER::got_error() {
error = ERR_IO;
io_done = true;
}
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