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C语言用UDP 实现局域网聊天程序源码.doc
#include
#include
#include
#include
#include
#include
#include
#include
#define CLIENT_LOGIN
#define CLIENT_CHAT
#define CLIENT_QUIT
#define SERVER_CHAT
#define SERVER_QUIT
100
200
300
400
500
struct node
{
char name[20];
struct sockaddr_in client_addr;
struct node *next;
};
struct message
{
long type;
char 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 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);
}
//创建子经常
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)
{
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;
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);
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 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 ;
}
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