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/* borrowed from bzflag
* Copyright (c) 1993 - 2003 Tim Riker
*
* I hacked it up somewhat - for straight C, and to better fit in with Conquest.
* JET
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the LGPL. [JET]
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "c_defs.h"
#include "conqnet.h"
#include "udp.h"
int udpOpen(int port, struct sockaddr_in* addr)
{
#if defined(_WIN32)
const BOOL optOn = TRUE;
BOOL opt = optOn;
#else
const int optOn = 1;
int opt = optOn;
#endif
int fd;
/* check parameters */
if (!addr) {
clog("NET: openUDPnetwork: Must supply an address structure!");
return -1;
}
memset(addr, 0, sizeof(*addr));
/* open socket */
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
clog("NET: openUDPnetwork: socket");
return -1;
}
/* set address info */
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = htonl(INADDR_ANY);
addr->sin_port = htons(port);
#if defined(SO_REUSEPORT)
/* set reuse port */
opt = optOn;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT,
(SSOType)&opt, sizeof(opt)) < 0) {
clog("NET: setsockopt SO_REUSEPORT: %s", strerror(errno));
close(fd);
return -1;
}
#elif defined(SO_REUSEADDR)
/* set reuse address */
opt = optOn;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
(SSOType)&opt, sizeof(opt)) < 0) {
clog("NET: openUDPnetwork: setsockopt SO_REUSEADDR: %s", strerror(errno));
close(fd);
return -1;
}
#endif
/* bind address */
if (bind(fd, (const struct sockaddr*)addr, sizeof(*addr)) < 0) {
clog("NET: openUDPnetwork: bind: %s", strerror(errno));
close(fd);
return -1;
}
return fd;
}
int udpClose(int fd)
{
if (fd == -1)
return 0;
return close(fd);
}
int udpSend(int fd, const void* buffer,
int bufferLength,
const struct sockaddr_in* addr)
{
return sendto(fd, (const char*)buffer, bufferLength, 0,
(const struct sockaddr*)addr, sizeof(*addr));
}
int udpRecv(int fd, void* buffer, int bufferLength,
struct sockaddr_in* addr)
{
struct sockaddr_in from;
AddrLen fromLength = sizeof(from);
int byteCount = recvfrom(fd, (char*)buffer, bufferLength, 0,
(struct sockaddr*)&from, (socklen_t*) &fromLength);
if (byteCount < 0) {
if (errno == EWOULDBLOCK) {
return 0;
}
else {
clog("NET: udpRecv: %s", strerror(errno));
return -1;
}
}
if (addr)
*addr = from;
return byteCount;
}
// ex: shiftwidth=2 tabstop=8
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