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#include <myhead.h>
#define PORT 8888
#define IP "192.168.122.48"
struct MSG
{char tyep;char name[20];char buf[128];
};
typedef struct Node
{struct sockaddr_in cin;struct Node*next;
}*node;int main(int argc, const char *argv[])
{node head=NULL;int sfd=socket(AF_INET,SOCK_DGRAM,0);if(sfd==-1){perror("socket error");return -1;}int reuse=setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse));if(reuse==-1){perror("setsockopt error");return -1;}struct sockaddr_in sin;sin.sin_family=AF_INET;sin.sin_port=htons(PORT);sin.sin_addr.s_addr=inet_addr(IP);if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1){perror("bind error");return -1;}int pid=fork();if(pid>0){//父收struct sockaddr_in cin;socklen_t socklen=sizeof(cin);struct MSG mg;node p=(node)malloc(sizeof(struct Node));p->next=NULL;while(1){bzero(&mg,sizeof(mg));recvfrom(sfd,&mg,sizeof(mg),0,(struct sockaddr*)&cin,&socklen);int tyep=ntohl(mg.tyep);switch(tyep){case 'L':{printf("%s[%s:%d]登陆成功\n",mg.name,inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));sprintf(mg.buf,"----%s登陆成功----",mg.name);while(p->next!=NULL){p=p->next;sendto(sfd,&mg,sizeof(mg),0,(struct sockaddr*)&(p->cin),sizeof(p->cin));}p->cin=cin;p->next=NULL;head->next=p;}break;case 'C':{//便利链表但是要跳过当前客户端char wbuf[258]="";sprintf(wbuf,"%s:%s",mg.name,mg.buf);strcpy(mg.buf,wbuf);while(p->next!=NULL){p=p->next;if(memcmp(&cin,&p->cin,sizeof(cin))!=0){sendto(sfd,&mg,sizeof(mg),0,(struct sockaddr*)&(p->cin),sizeof(p->cin));}}}break;case 'Q':{//暗元素删除sprintf(mg.buf,"----%s已下线----",mg.name);while(p->next!=NULL){if(memcmp(&cin,&p->next->cin,sizeof(cin))==0){node q=p->next;p->next=q->next;free(q);}else{p=p->next;sendto(sfd,&mg,sizeof(mg),0,(struct sockaddr*)&p->cin,sizeof(p->cin));}}}break;}}}else if(pid==0){//子发struct MSG mg={htonl(1),"系统"};while(1){bzero(mg.buf,128);fgets(mg.buf,128,stdin);mg.buf[strlen(mg.buf)-1]=0;sendto(sfd,&mg,sizeof(mg),0,(struct sockaddr*)&sin,sizeof(sin));}}else{perror("fork error");return -1;}return 0;
}

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