#include <stdio.h>#include <stdlib.h>#include <string.h>//#include "ipmsg.h"#include "udp_comm.h"#include "utils.h"#include "userlist.h"struct user_info ipmsg_usrlist;pthread_mutex_t MUTEX_USERLIST;int add_user(struct user_info *user_list,struct msg_info *msg){	struct user_info *pre,*cur;	struct user_info *new_user;	short comp_name,comp_host,comp_addr;		if((user_list == NULL)||(msg == NULL))		return FAILED_ADD;		if(msg->peer.sin_addr.s_addr == htonl(INADDR_ANY))		return FAILED_ADD;		new_user = (struct user_info *)s_malloc(sizeof(struct user_info));	bzero(new_user,sizeof(struct user_info));	memcpy(&new_user->peer,&msg->peer,sizeof(msg->peer));	strncpy(new_user->name,msg->sender,sizeof(new_user->name));	strncpy(new_user->host,msg->host,sizeof(new_user->host));//	new_user->in_use = 0;	new_user->exit = 0;	new_user->next = NULL;		pthread_mutex_lock(&MUTEX_USERLIST);	pre = user_list;	cur = user_list->next;			while(cur != NULL)	{		comp_name = strncmp(cur->name,new_user->name,LEN_NAME);		if(comp_name > 0)			break;		comp_host = strncmp(cur->host,new_user->host,LEN_NAME);		comp_addr = memcmp(&cur->peer,&new_user->peer,sizeof(cur->peer));				if( (comp_name == 0)&&(comp_host == 0)&&(comp_addr == 0) )		{			if(cur->exit == 1)				cur->exit = 0;						pthread_mutex_unlock(&MUTEX_USERLIST);			return USER_EXIST;		}				pre = cur;		cur = cur->next;	}		new_user->next = cur;	pre->next	 = new_user;	pthread_mutex_unlock(&MUTEX_USERLIST);	return SUCCESS;}int del_user(struct user_info *user_list,struct msg_info *msg){	struct user_info *cur;	int comp_name,comp_host,comp_addr;		if((user_list == NULL)||(msg == NULL))		return FAILED_DEL;		pthread_mutex_lock(&MUTEX_USERLIST);	cur = user_list->next;		while(cur != NULL)	{		comp_name = strncmp(cur->name,msg->sender,LEN_NAME);		if(comp_name > 0) {			pthread_mutex_unlock(&MUTEX_USERLIST);			return USER_NONEXIST;		}					comp_host = strncmp(cur->host,msg->host,sizeof(cur->host));		comp_addr = memcmp(&cur->peer,&msg->peer,sizeof(cur->peer));				if( (comp_name == 0)&&(comp_host == 0)&&(comp_addr == 0))		{			cur->exit = 1;			break;		}				cur = cur->next;	}	pthread_mutex_unlock(&MUTEX_USERLIST);	return SUCCESS;}int find_user_byNO(struct user_info *user_list,int user_no,struct user_info **target){	struct user_info *cur;	int count;		if((user_list == NULL)||(user_no < 1))		return -1;		pthread_mutex_lock(&MUTEX_USERLIST);	cur = user_list->next;		for(count = 1; (cur->next != NULL) &&(count < user_no); cur = cur->next,count++ );	*target=cur;	pthread_mutex_unlock(&MUTEX_USERLIST);		return (count != user_no);}				int list_user(struct user_info *user_list){	int user_no;	char title_name[] = "USERNAME";	char title_host[] = "HOST";	char title_IP[] = "IP";	char title_pri[] = "PRIORITY";/*use in later*/	struct user_info *cur;				printf("\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");	printf("\t%-10s %-15s %-15s %-5s\n",title_name,title_host,title_IP,title_pri);	pthread_mutex_lock(&MUTEX_USERLIST);	cur = user_list->next;	for(user_no = 0; cur != NULL; cur = cur->next)	{		if(cur->exit == 0)		{			printf("    %-4d%-10s %-15s %-15s  %-5s\n",				++user_no,cur->name,cur->host,inet_ntoa(cur->peer.sin_addr),"-");		}	}	pthread_mutex_unlock(&MUTEX_USERLIST);	printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");			if(user_no == 0) {		printf("No users exists!\n");		printf("Please list later.\n\n");	}	return user_no;}int free_userlist(struct user_info *user_list){	struct user_info *cur;	struct user_info *next;		if(user_list == NULL)		return -1;		pthread_mutex_lock(&MUTEX_USERLIST);	cur = user_list->next;	while(cur != NULL)	{		next = cur->next;		free(cur);		cur = next;	}	pthread_mutex_unlock(&MUTEX_USERLIST);	return SUCCESS;}		int talkto_user(struct user_info *user_list,int user_no,char *talk_msg,int msg_len){	int ret;	struct user_info *target_user;	struct msg_info *msg;		if((user_list == NULL) || (user_no < 1)||(talk_msg == NULL)) {		printf("!!!Non user exist OR provied user_no is invailid OR message is nil.\n");		return -1;	}		ret = find_user_byNO(user_list,user_no,&target_user);	if(ret != 0) {		printf("\nThe USER_NO provided can't be find! \n");		printf("Please check your input is correct.\n");		return USER_NONEXIST;	}			msg = (struct msg_info *)s_malloc(sizeof(struct msg_info));	init_msg(msg,IPMSG_SENDMSG|IPMSG_SENDCHECKOPT);	memcpy(&msg->peer,&target_user->peer,sizeof(msg->peer));	strncpy(msg->extended,talk_msg,LEN_MSG);		ret=send_msg(msg_sock_fd,msg);	if(ret < 0) {			printf("The message FAILED to SEND!(%s) :\n MESSAGE CONTENT:%s\n",				target_user->name,msg->extended);	}	else		printf("Message send OK!MSG_ID[$%u]\n",msg->packet_no);	free(msg);	return ret;}int refresh(){	login();	list_user(&ipmsg_usrlist);	return 0;}