meridiandemo.h

件主要用于帮助计算机爱好者学习蚁群算法时做有关蚁群算法的试验。蚁群算法作为一种优秀的新兴的算法

#ifndef MERIDIAN_DEMO_COMMON
#define MERIDIAN_DEMO_COMMON

//	Returns a query id based on the address and port
//	of the current node
uint64_t getNewQueryID(int sockFD) {
	char hostname[HOST_NAME_MAX];
	gethostname(hostname, HOST_NAME_MAX);
	hostname[HOST_NAME_MAX - 1] = '\0';
	struct hostent* he = gethostbyname(hostname);
	if (he == NULL) {
		perror("Cannot resolve localhost\n");
		return Packet::to64(rand(), rand());
	}
	u_int localAddr = ntohl(((struct in_addr *)(he->h_addr))->s_addr);
	u_short randVal = rand() % USHRT_MAX;
	struct sockaddr_in addr;
	socklen_t sockSize = sizeof(struct sockaddr_in);
	if (getsockname(sockFD, (struct sockaddr *)&addr, 
		&sockSize) == -1) {
		perror("Getsockname error\n");
		return Packet::to64(rand(), rand());
	}
	//	Concat with port
	u_int secondParam = ntohs(addr.sin_port);
	secondParam = secondParam << 16;
	secondParam |= randVal;
	//	Concat with address		
	return Packet::to64(localAddr, secondParam);
}

//	For parsing command line input
int parseHostAndPort(const char* nodeStr, NodeIdent& remoteNode) {
	char hostname[HOST_NAME_MAX];
	//	Hostname and port separated by ':'
	const char* tmpStrPtr = strchr(nodeStr, ':');
	if (tmpStrPtr == NULL) {
		fprintf(stderr, "Invalid parameter, should be hostname:port\n");
		return -1;
	}
	memcpy(hostname, nodeStr, tmpStrPtr - nodeStr);
	hostname[tmpStrPtr - nodeStr] = '\0';
	remoteNode.port = (u_short) atoi(tmpStrPtr + 1);
	//	Get the add of remote host
	struct hostent * tmp = gethostbyname(hostname);
	if (tmp == NULL || tmp->h_addr_list == NULL) {
		fprintf(stderr, "Can not resolve hostname of meridan node\n");
		return -1;
	}
	remoteNode.addr = 
		ntohl(((struct in_addr *)(tmp->h_addr))->s_addr);
	return 0;
}

#endif