linux网络编程　UDP聊天程序　包括群聊和私聊

2023-12-08 10:32
文章标签 linux 程序 编程 udp 网络 聊天 包括 群聊 私聊

本文主要是介绍linux网络编程　UDP聊天程序　包括群聊和私聊，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

原文地址：http://blog.csdn.net/yanghaoran321/article/details/7885937


程序功能：

   能够支持多个客户端同时运行，具有群聊，私聊，上线通知，下线通知，系统消息等功能。


程序如下：

１．　server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#define CLIENT_LOGIN    100
#define CLIENT_CHAT     200
#define CLIENT_QUIT     300
#define SERVER_CHAT     400
#define SERVER_QUIT     500
#define PRINT_ONLINE    600
#define PRIVATE_CHAT    700
struct node 
{
char name[20];
struct sockaddr_in client_addr;
struct node *next;
};
struct message
{
long type;
char name[20];
char peer_name[20];
char mtext[512];
};
struct node *create_list(void);
void insert_list(struct node *, char *,struct sockaddr_in *);
void delete_list(struct node *, char *);
void recv_message(int , struct node *);
void send_message(int , struct sockaddr_in *, pid_t );
void client_login(int , struct node *, struct message *, struct sockaddr_in *);
void client_chat(int , struct node *, struct message *);
void client_quit(int , struct node *, struct message *);
void server_chat(int , struct node *, struct message *);
void server_quit(int , struct node *, struct message *);
void brocast_msg(int , struct node *, struct message *);
void print_online(int , struct node *, struct message *);
void private_chat(int , struct node *, struct message *);
void father_func(int sig_no)
{
return ;
}
int main(int argc, const char *argv[])
{
int socket_fd;
pid_t pid;
struct sockaddr_in server_addr;
struct node *head;
if (argc < 3)
{
fprintf(stderr, "usages : %s ip port\n", argv[0]);
exit(-1);
}
if ((socket_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror("failed to create socket");
exit(-1);
}
head = create_list();
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(atoi(argv[2]));
server_addr.sin_addr.s_addr = inet_addr(argv[1]);
if (bind(socket_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("failed to bind");
exit(-1);
}
if ((pid = fork()) < 0)
{
perror("failed to fork pid");
exit(-1);
}
if (pid == 0)
recv_message(socket_fd, head);
else
send_message(socket_fd, &server_addr, pid);
return 0;
}
struct node *create_list(void)
{
struct node *head;
head = (struct node *)malloc(sizeof(struct node));
head->next = NULL;
return head;
}
void insert_list(struct node *head, char *name, struct sockaddr_in *client_addr)
{
struct node *new;
new = (struct node *)malloc(sizeof(struct node));
strcpy(new->name, name);
new->client_addr = *client_addr;
new->next = head->next;
head->next = new;
return ;
}
void delete_list(struct node *head, char *name)
{
struct node *p = head->next;
struct node *q = head;
while (p != NULL)
{
if (strcmp(p->name, name) == 0)
break;
p = p->next;
q = q->next;
}
q->next = p->next;
p->next = NULL;
free(p);
return ;
}
void recv_message(int socket_fd, struct node *head)
{
struct message msg;
struct sockaddr_in client_addr;
int client_addrlen = sizeof(struct sockaddr);
while (1)
{
memset(&msg, 0, sizeof(msg));
if (recvfrom(socket_fd, &msg, sizeof(msg), 0, (struct sockaddr *)&client_addr, &client_addrlen) < 0)
{
perror("failed to recvform client");
exit(-1);
}
switch(msg.type)
{
case CLIENT_LOGIN:
client_login(socket_fd, head, &msg, &client_addr);
break;
case CLIENT_CHAT:
client_chat(socket_fd, head, &msg);
break;
case CLIENT_QUIT:
client_quit(socket_fd, head, &msg);
break;
case SERVER_CHAT:
server_chat(socket_fd, head, &msg);
break;
case SERVER_QUIT:
server_quit(socket_fd, head, &msg);
break;
case PRINT_ONLINE:
print_online(socket_fd, head, &msg);
break;
case PRIVATE_CHAT:
private_chat(socket_fd, head, &msg);
break;
default:
break;
}
}
return ;
}
void send_message(int socket_fd, struct sockaddr_in *server_addr, pid_t pid)
{
struct message msg;
char buf[512];
signal(getppid(), father_func);
while (1)
{
usleep(500);
printf(">");
fgets(buf, sizeof(buf), stdin);
buf[strlen(buf) - 1] = 0;
strcpy(msg.mtext, buf);
strcpy(msg.name , "server");
msg.type = SERVER_CHAT;
if (strncmp(buf, "quit", 4) == 0)
{
msg.type = SERVER_QUIT;
if (sendto(socket_fd, &msg, sizeof(msg), 0, 
(struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0)
{
perror("failed to send server_quit message");
exit(-1);
}
pause();
kill(pid, SIGKILL);
waitpid(pid, NULL, 0);
close(socket_fd);
exit(0);
}
if (sendto(socket_fd, &msg, sizeof(msg), 0, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0)
{
perror("failed to send server_chat message");
exit(-1);
}
}
return ;
}
void client_login(int socket_fd, struct node *head, struct message *msg, struct sockaddr_in *client_addr)
{
printf("********Login In********\n");
printf("%s is Login In\n", msg->name);
printf("************************\n");
insert_list(head, msg->name, client_addr);
brocast_msg(socket_fd, head, msg);
return ;
}
void client_chat(int socket_fd, struct node *head, struct message *msg)
{
printf("********Group Chat********\n");
printf("name: %s\n", msg->name);
printf("msg: %s\n", msg->mtext);
printf("**************************\n");
brocast_msg(socket_fd, head, msg);
return ;
}
void client_quit(int socket_fd, struct node *head, struct message *msg)
{
printf("*********Quit Msg********\n");
printf("%s is Quit\n", msg->name);
printf("*************************\n");
delete_list(head, msg->name);
brocast_msg(socket_fd, head, msg);
return ;
}
void server_chat(int socket_fd, struct node *head, struct message *msg)
{
printf("********Server Msg*********\n");
printf("msg: %s\n", msg->mtext);
printf("***************************\n");
brocast_msg(socket_fd, head, msg);
return ;
}
void server_quit(int socket_fd, struct node *head, struct message *msg)
{
brocast_msg(socket_fd, head, msg);
kill(getppid(), SIGUSR1);
return ;
}
void print_online(int socket_fd, struct node *head, struct message *msg)
{
struct node *p = head->next;
struct sockaddr_in my_addr;
char buf[512];
printf("%s is request to print online client\n", msg->name);
memset(buf, 0, sizeof(buf));
while (p != NULL)
{
if (strcmp(p->name, msg->name) == 0)
my_addr = p->client_addr;
strcat(buf, p->name);
strcat(buf, " ");
p = p->next;
}
strcpy(msg->mtext, buf);
msg->type = PRINT_ONLINE;
if (sendto(socket_fd, msg, sizeof(struct message), 0, 
(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
{
perror("failed to send print_online message");
exit(-1);
}
return ;
}
void private_chat(int socket_fd, struct node *head, struct message *msg)
{
struct node *p = head->next;
struct sockaddr_in peer_addr;
printf("******** Private Msg ********\n");
printf("from %s\n", msg->name);
printf("to %s\n", msg->peer_name);
printf("msg: %s\n", msg->mtext);
printf("*****************************\n");
while (p != NULL)
{
if (strcmp(p->name, msg->peer_name) == 0)
{
peer_addr = p->client_addr;
break;
}
p = p->next;
}
if (sendto(socket_fd, msg, sizeof(struct message), 0, 
(struct sockaddr *)&peer_addr, sizeof(peer_addr)) < 0)
{
perror("failed to send private message");
exit(-1);
}
return ;
}
void brocast_msg(int socket_fd, struct node *head, struct message *msg)
{
struct node *p = head->next;
while(p != NULL)
{
if (msg->type == CLIENT_LOGIN)
{
if (strcmp(p->name, msg->name) == 0)
{
p = p->next;
continue;
}
}
sendto(socket_fd, msg, sizeof(struct message), 0, (struct sockaddr *)&(p->client_addr), sizeof(struct sockaddr));
p = p->next;
}
return ;
}

2.client.c 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>#define CLIENT_LOGIN    100
#define CLIENT_CHAT     200
#define CLIENT_QUIT     300#define SERVER_CHAT     400
#define SERVER_QUIT     500#define PRINT_ONLINE    600
#define PRIVATE_CHAT    700struct message
{long type;char name[20];char peer_name[20];char mtext[512];
};void recv_message(int );
void send_message(int , struct sockaddr_in *, char *, pid_t);void login_msg(struct message *);
void group_msg(struct message *);
void quit_msg(struct message *);
void server_msg(struct message *);
void server_quit(void);
void online_msg(struct message *);
void private_msg(struct message *);void print_online(int , struct message *, struct sockaddr_in *);
void group_chat(int , struct message *, struct sockaddr_in *);
void private_chat(int ,struct message *, struct sockaddr_in *);
void client_quit(int , struct message *, struct sockaddr_in *, pid_t );int main(int argc, char *argv[])
{pid_t pid;int server_fd;struct sockaddr_in server_addr;if (argc < 4){fprintf(stderr, "usages: %s ip port name\n", argv[0]);exit(-1);}if ((server_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0){perror("failed to create server_fd");exit(-1);}server_addr.sin_family = AF_INET;server_addr.sin_port = htons(atoi(argv[2]));server_addr.sin_addr.s_addr = inet_addr(argv[1]);// inet_pton(AF_INET,argv[1],&server_addr.sin_addr);  //ipv4 if ((pid = fork()) < 0){perror("failed to fork pid");exit(-1);}if (pid == 0)recv_message(server_fd);elsesend_message(server_fd, &server_addr, argv[3], pid);return 0;
}void recv_message(int server_fd)
{struct message msg;while (1){memset(&msg, 0, sizeof(msg));if (recvfrom(server_fd, &msg, sizeof(msg), 0, NULL, NULL) < 0){perror("failed to recv server message");exit(-1);}switch(msg.type){case CLIENT_LOGIN:login_msg(&msg);break;case CLIENT_CHAT:group_msg(&msg);break;case CLIENT_QUIT:quit_msg(&msg);break;case SERVER_CHAT:server_msg(&msg);break;case SERVER_QUIT:server_quit();break;case PRINT_ONLINE:online_msg(&msg);break;case PRIVATE_CHAT:private_msg(&msg);break;default:break;}}return ;
}void send_message(int server_fd, struct sockaddr_in *server_addr, char *name, pid_t pid)
{struct message msg;char buf[512];int c;msg.type = CLIENT_LOGIN;strcpy(msg.name, name);if (sendto(server_fd, &msg, sizeof(msg), 0, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0){perror("failed to send login message");exit(-1);}while(1){usleep(500);printf("#####################################\n");printf("the following options can be choose:\n");printf("input 1 is to print online client\n");printf("input 2 is to chat to all the client\n");printf("input 3 is to chat to only one client\n");printf("input q is to quit\n");printf("#####################################\n");printf(">");c = getchar(); //输入回车符时停止输入到缓冲区while (getchar() != '\n'); //读出全部缓冲区的数据，包括'\n'switch(c){case '1':print_online(server_fd, &msg, server_addr);break;case '2':group_chat(server_fd, &msg, server_addr);break;case '3':private_chat(server_fd, &msg, server_addr);break;case 'q':client_quit(server_fd, &msg, server_addr, pid);break;default:break;}}return ;
}void login_msg(struct message *msg)
{printf("######## Login in ########\n");printf("%s is login in\n", msg->name);printf("######## Login in ########\n");return ;
}void group_msg(struct message *msg)
{printf("******** Group Msg ********\n");printf("name: %s\n", msg->name);printf("msg: %s\n", msg->mtext);printf("******** Group Msg ********\n");return ;
}void quit_msg(struct message *msg)
{printf("######## Quit Msg ########\n");printf("%s is Quit\n", msg->name);printf("######## Quit Msg ########\n");return ;
}void server_msg(struct message *msg)
{printf("******** Server Msg ********\n");printf("msg: %s\n", msg->mtext);printf("******** Server Msg ********\n");return ;
}void server_quit(void )
{kill(getppid(), SIGKILL);exit(0);
}void online_msg(struct message *msg)
{printf("******** Online Client ********\n");printf("%s\n", msg->mtext);printf("******** Online Client ********\n");return ;
}void private_msg(struct message *msg)
{printf("******** Private Msg ********\n");printf("name: %s\n", msg->name);printf("msg: %s\n", msg->mtext);printf("******** Private Msg ********\n");return ;
}void print_online(int server_fd, struct message *msg, struct sockaddr_in *server_addr)
{msg->type = PRINT_ONLINE;if (sendto(server_fd, msg, sizeof(struct message), 0, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0){perror("failed to send online message");exit(-1);}return ;
}void group_chat(int server_fd, struct message *msg, struct sockaddr_in *server_addr)
{char buf[512];memset(buf, 0, sizeof(buf));printf("*********** Group Chat Room ***********\n");printf("****** Welcome to group chat room ******\n");printf("* if you want to quit, please input quit\n");printf("****************************************\n");while(1){memset(buf, 0, sizeof(buf));usleep(500);printf(">");fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = 0;msg->type = CLIENT_CHAT;strcpy(msg->mtext, buf);if (strncmp(buf, "quit", 4) == 0)break;if (sendto(server_fd, msg, sizeof(struct message), 0, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0){perror("failed to send group message");exit(-1);}}return ;
}void private_chat(int server_fd, struct message *msg, struct sockaddr_in *server_addr)
{char name[20];char buf[512];memset(name, 0, sizeof(name));printf("please input the peer_name\n");printf(">");fgets(name, sizeof(name), stdin);name[strlen(name) - 1] = 0;strcpy(msg->peer_name, name);msg->type = PRIVATE_CHAT;printf("connect to %s OK!\n", msg->peer_name);while(1){usleep(500);printf(">");fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = 0;strcpy(msg->mtext, buf);if (strncmp(buf, "quit", 4) == 0)break;if (sendto(server_fd, msg, sizeof(struct message), 0, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0){perror("failed to send private message");exit(-1);}}return ;
}void client_quit(int server_fd, struct message *msg, struct sockaddr_in *server_addr, pid_t pid)
{msg->type = CLIENT_QUIT;if (sendto(server_fd, msg, sizeof(struct message), 0, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) < 0){perror("failed to send quit message");exit(-1);}kill(pid, SIGKILL);waitpid(pid, NULL, 0);exit(0);
}






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