Have a great spirit can provide a server and client one-on-one chat reference C code for me?-CodePudding

Based on udp protocol and requirements as our normal chat, the client can send multiple consecutive to the server information, thank!

CodePudding user response:

#include
#include
#include
#include
#include
#include
#include

Struct MSG
{
Char type;
Char name [15].
Char buf [128].
};

Typedef struct node
{
Struct sockaddr_in data;
struct node *next;
} listnode;
Listnode * create_head ()
{
Listnode * H;

H=malloc (sizeof (listnode));

H - & gt; Next=NULL;
Return H;
}

Void do_login (listnode * H, struct sockaddr_in cliaddr, int sockfd, struct MSG info)
{
Listnode * p=H - & gt; next;

While (p!=NULL)
{
If (memcmp (& amp; Cliaddr, & amp; P - & gt; The data, sizeof (cliaddr))!=0)
Sendto (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; P - & gt; The data, sizeof (p - & gt; Data));
P=p - & gt; next;
}

P=malloc (sizeof (listnode));

P - & gt; Data=https://bbs.csdn.net/topics/cliaddr;

P - & gt; Next=H - & gt; next;
H - & gt; Next=p;
}

Void do_sendmsg (listnode * H, struct sockaddr_in cliaddr, int sockfd, struct MSG info)
{
Listnode * p=H - & gt; next;

While (p!=NULL)
{
If (memcmp (& amp; Cliaddr, & amp; P - & gt; The data, sizeof (cliaddr))!=0)
Sendto (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; P - & gt; The data, sizeof (p - & gt; Data));
P=p - & gt; next;
}
}

Void do_quit (listnode * H, struct sockaddr_in cliaddr, int sockfd, struct MSG info)
{
Listnode * p=H;
Listnode * q;
While (p - & gt; Next!=NULL)
{
If (memcmp (& amp; Cliaddr, & amp; P - & gt; Next - & gt; The data, sizeof (cliaddr))==0)
{
Q=p - & gt; next;
P - & gt; Next=q - & gt; next;

free(q);
}
The else
{
Sendto (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; P - & gt; Next - & gt; The data, sizeof (p - & gt; Next - & gt; Data));
P=p - & gt; next;
}
}
}

Int main (int arg c, const char * argv [])
{
Int sockfd;
Listnode * H;

Sockfd=socket (AF_INET, SOCK_DGRAM, 0);
If (sockfd==1)
{
Perror (" socket ");
exit(EXIT_FAILURE);
}

Struct sockaddr_in seraddr cliaddr;

Seraddr. Sin_family=AF_INET;
Seraddr. Sin_port=htons (50000);
Seraddr. Sin_addr. S_addr=inet_addr (" 192.168.1.250 ");

Bind (sockfd, (struct sockaddr *) & amp; Seraddr, sizeof (seraddr));

Struct MSG info;
Int clilen=sizeof (cliaddr);

H=create_head ();

While (1)
{
Recvfrom (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; Cliaddr, & amp; Clilen);

The switch (info. Type)
{
Case 'L' :
Do_login (H, cliaddr, sockfd, info).
break;
In case the 'S' :
Do_sendmsg (H, cliaddr, sockfd, info).
break;
Case 'Q:
Do_quit (H, cliaddr, sockfd, info).
break;

}
}
Close (sockfd);
return 0;
}

CodePudding user response:

The above is the server part

CodePudding user response:

 
Int main (int arg c, const char * argv []) 
{
Int sockfd; 
Pid_t pid; 
Sockfd=socket (AF_INET, SOCK_DGRAM, 0); 
If (sockfd==1) 
{
Perror (" socket "); 
exit(EXIT_FAILURE); 
} 

Struct sockaddr_in seraddr cliaddr; 

Seraddr. Sin_family=AF_INET; 
Seraddr. Sin_port=htons (50000); 
Seraddr. Sin_addr. S_addr=inet_addr (" 192.168.1.250 "); 

Struct MSG info; 

Info. Type='L'; 
Printf (" please enter the login name: "); 
The fgets (info. Name, sizeof (info. Name), stdin); 
Info. Name [strlen (info. Name) - 1]='\ 0'; 
Sendto (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; Seraddr, sizeof (seraddr)); 

Pid=fork (); 

If (pid==1) 
{

} 
Else if (pid==0) 
{
While (1) 
{
Printf (" please speak: "); 
The fgets (info. Buf, sizeof (info. Buf), stdin); 
Info. Buf [strlen (info. Buf) - 1]='\ 0'; 

If (STRNCMP (info. Buf, "quit", 4)==0) 
{
Info. Type='Q'; 
Sendto (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; Seraddr, sizeof (seraddr)); 
The kill (getppid (), SIGKILL); 
The exit (EXIT_SUCCESS); 
} 
The else 
{
Info. Type='S'. 
Sendto (sockfd, & amp; Info, sizeof (info), and 0, (struct sockaddr *) & amp; Seraddr, sizeof (seraddr)); 
} 
} 
} 
The else 
{
While (1) 
{
Recvfrom (sockfd, & amp; Info, sizeof (info), and 0, NULL, NULL); 

The switch (info. Type) 
{
Case 'L' : 
Online printf (" % s \ n ", the info. Name); 
break; 
In case the 'S' : 
Printf (" % s: % s \ n ", the info. Name, info. Buf); 
break; 
Case 'Q: 
Offline printf (" % s \ n ", the info. Name); 
break; 

} 
} 
} 

Close (sockfd); 
return 0; 
}