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/*
* tcp.c
*
* Copyright (C) 2004-2011 Simon Wunderlich <sw@simonwunderlich.de>
*
* This file is part of s3d, a 3d network display server.
* See http://s3d.berlios.de/ for more updates.
*
* s3d 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 2 of the License, or
* (at your option) any later version.
*
* s3d 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 s3d; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "global.h"
#ifdef TCP
#include <errno.h> /* errno */
#include <string.h> /* memset() */
#ifdef WIN32 /* sohn wars */
#include <winsock2.h>
#else /* sohn wars */
#include <sys/types.h> /* fd_set, FD*, socket, accept ... */
#include <sys/socket.h> /* socket, accept ... */
#include <sys/select.h> /* fd_set,FD* */
#include <sys/time.h> /* fd_set,FD* */
#include <netinet/in.h> /* ntohs(),htons(),htonl(),ntohl() */
#include <arpa/inet.h> /* network */
#endif /* sohn wars */
#include <time.h> /* select() timeval things */
#include <fcntl.h> /* fcntl(),F_SETOWN */
#ifndef F_SETOWN /* somehow it is not set with -ansi */
#define F_SETOWN 8
#endif
#include <unistd.h> /* read(),write(),getpid(),close() */
#include <stdlib.h> /* malloc(),free() */
#include <stdint.h>
static int tcp_sockid;
int tcp_init(void)
{
int yes = 1;
struct sockaddr_in my_addr;
s3dprintf(LOW, "server: creating socket");
#ifdef WIN32 /* sohn wars */
WSADATA datainfo;
if (WSAStartup(257, &datainfo) != 0)
errnf("startup()", 0);
#endif /* auch sohn */
if ((tcp_sockid = socket(AF_INET, SOCK_STREAM, 0)) < 0)
errnf("socket()", errno);
s3dprintf(LOW, "server: binding my local socket");
/* allow addresses to be reused */
/* this seems to have something to do with servers using one port */
if (setsockopt(tcp_sockid, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1)
errn("setsockopt(...,SO_REUSEADDR...)", errno);
memset((char *)&my_addr, 0, sizeof(my_addr));
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(S3D_PORT);
my_addr.sin_addr.s_addr = htons(INADDR_ANY);
if (bind(tcp_sockid, (struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
errnf("bind()", errno);
if (listen(tcp_sockid, 5) < 0)
errnf("listen()", errno);
#ifdef SIGS
if (fcntl(tcp_sockid, F_SETFL, O_ASYNC | O_NONBLOCK) < 0)
errnf("fcntl()", errno);
if (fcntl(tcp_sockid, F_SETOWN, getpid()) < 0)
errnf("fcntl()", errno);
#endif
return 0;
}
int tcp_quit(void)
{
close(tcp_sockid);
#ifdef WIN32
WSACleanup();
#endif
return 0;
}
/* watches the port for new connections */
int tcp_pollport(void)
{
fd_set fs_port; /* filedescriptor set for listening port(s) */
int newsd; /* new socket descriptor */
struct timeval tv; /* time structure */
struct t_process *new_p; /* pointer to new process */
struct sockaddr client_addr; /* new client's address */
socklen_t clilen = sizeof(client_addr); /* length of client's address */
FD_ZERO(&fs_port);
FD_SET(tcp_sockid, &fs_port);
select_again:
tv.tv_sec = tv.tv_usec = 0;
if (select(FD_SETSIZE, &fs_port, NULL, NULL, &tv) < 0) {
if (errno == EINTR) { /* interruption by some evil signal, just do again :) */
errn("tcp_pollport():select()", errno);
goto select_again; /* oh no, a goto!! that's evil */
} else
errn("tcp_pollport():select()", errno);
} else if (FD_ISSET(tcp_sockid, &fs_port)) { /* redundant, I guess */
s3dprintf(HIGH, "select(): new connection!!");
if ((newsd = accept(tcp_sockid, (struct sockaddr *)&client_addr, &clilen)) < 0)
errn("accept()", errno);
else {
#ifdef SIGS
if (fcntl(newsd, F_SETFL, O_ASYNC) < 0)
errnf("fcntl()", errno);
if (fcntl(newsd, F_SETOWN, getpid()) < 0)
errnf("fcntl()", errno);
#endif
new_p = process_add();
new_p->con_type = CON_TCP;
new_p->sockid = newsd;
s3dprintf(HIGH, "registered new connection %d as pid %d", new_p->sockid, new_p->id);
}
}
return 0;
}
/* this is about looking for new data on the sockets */
/* returns 1 when there was new data. */
int tcp_pollproc(void)
{
fd_set fs_proc; /* filedescriptor set for listening port(s) */
struct timeval tv; /* time structure */
struct t_process *p;
int found = 0;
int i, unfinished, n, off;
off = 0;
do {
FD_ZERO(&fs_proc);
unfinished = 0;
n = 0;
for (i = off; i < procs_n; i++) {
p = &procs_p[i];
if (p->con_type == CON_TCP) {
FD_SET(p->sockid, &fs_proc);
n++;
if (n >= FD_SETSIZE) { /* don't overflow the setsize! */
off = i;
unfinished = 1;
break;
}
}
}
/* maybe having a global fd_set for all the processes would have been better */
/* than generating them new in every poll. to be optimized... */
select_again_poll:
tv.tv_sec = tv.tv_usec = 0;
if (select(FD_SETSIZE, &fs_proc, NULL, NULL, &tv) == -1) {
if (errno == EINTR) {
errn("tcp_pollproc():select()", errno);
goto select_again_poll;
} else {
errn("tcp_pollproc():select()", errno);
}
} else {
/* data is available */
for (i = 0; i < procs_n; i++) {
p = &procs_p[i];
if (p->con_type == CON_TCP) {
if (FD_ISSET(p->sockid, &fs_proc)) {
FD_CLR(p->sockid, &fs_proc); /* clear it from the fd */
tcp_prot_com_in(p);
found = 1;
}
}
}
}
} while (unfinished);
return found;
}
/* read some data from the line, pushes it into the buffer and calls prot_com_in */
int tcp_prot_com_in(struct t_process *p)
{
uint16_t length;
if (3 == tcp_readn(p->sockid, ibuf, 3)) {
length = ntohs(*((uint16_t *) ((uint8_t *) ibuf + 1)));
s3dprintf(VLOW, "command %d, length %d", ibuf[0], length);
if (length > 0) {
tcp_readn(p->sockid, ibuf + sizeof(int_least32_t), length); /* uint16_t is limited to 65536, so */
/* length can't be bigger than that ... lucky */
}
prot_com_in(p, ibuf);
} else {
s3dprintf(LOW, "tcp_prot_com_in():n_readn():fd seems to be dead (pid %d, sock %d)", p->id, p->sockid);
process_del(p->id);
}
return 0;
}
/* shamelessly ripped from simple ftp server */
int tcp_readn(int sock, uint8_t * str, int s)
{
int no_left, no_read;
no_left = s;
while (no_left > 0) {
no_read = read(sock, str, no_left);
if (no_read < 0) {
errn("read()", errno);
return no_read;
}
if (no_read == 0)
break;
no_left -= no_read;
str += no_read;
}
return s - no_left;
}
int tcp_writen(int sock, uint8_t * str, int s)
{
int no_left, no_written;
no_left = s;
while (no_left > 0) {
no_written = write(sock, str, no_left);
if (no_written <= 0) {
errn("write()", errno);
return no_written;
}
no_left -= no_written;
str += no_written;
}
return s - no_left;
}
int tcp_remove(int sock)
{
return close(sock);
}
#endif
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