Network Programming client and server

After translating so many chapters, we need to write a simple client and server-side program by ourselves!

 

Client Side:

Getaddrinfo ()-> socket ()-> connect ()-> recv ()

Code:
# Include <stdio. h>
# Include <string. h>
# Include <sys/types. h>
# Include <sys/socket. h>
# Include <arpa/inet. h>
# Include <netdb. h>
 
# Define SERVIP "192.168.56.112"
# Define SERVPORT "2349"
 
Int main (int argc, char * argv [])
{
Struct addrinfo hints, * res;
Int status;
Int sockfd;
Int connSta;

Int recvSta;
Char buffer [1024];
Int len;

Char ipstr [INET_ADDRSTRLEN];
Void * addr;

If (argc! = 3 ){
Fprintf (stderr, "Usage: Not Server IP And Port! ");
Return 1;
}

Memset (& hints, 0, sizeof (hints ));
Hints. ai_family = AF_UNSPEC;
Hints. ai_socktype = SOCK_STREAM;

Status = getaddrinfo (argv [1], argv [2], & hints, & res );

If (status! = 0 ){
Fprintf (stderr, "Error, Server IP And Port! ");
Return 2;
}

Sockfd = socket (res-> ai_family, res-> ai_socktype, res-> ai_protocol );

If (sockfd = 0 ){
Fprintf (stderr, "Create, socket fail! ");
Return 3;
}

ConnSta = connect (sockfd, res-> ai_addr, res-> ai_addrlen );

If (connSta! = 0 ){
Fprintf (stderr, "Connect, Remote Host fail! ");
Return 4;
}
Else {
Struct sockaddr_in * ipv4 = (struct sockaddr_in *) res-> ai_addr;
Addr = & (ipv4-> sin_addr );
 
Inet_ntop (res-> ai_family, addr, ipstr, sizeof (ipstr ));

Printf ("Linked: Host = % s, Port = % d \ n", ipstr, ntohs (ipv4-> sin_port ));
}


RecvSta = recv (sockfd, buffer, sizeof (buffer), 0 );

Printf ("\ n % s \ n", buffer );

Freeaddrinfo (res );
Close (sockfd );

Return 0;
}
# Include <stdio. h>
# Include <string. h>
# Include <sys/types. h>
# Include <sys/socket. h>
# Include <arpa/inet. h>
# Include <netdb. h>

# Define SERVIP "192.168.56.112"
# Define SERVPORT "2349"

Int main (int argc, char * argv [])
{
Struct addrinfo hints, * res;
Int status;
Int sockfd;
Int connSta;
 
Int recvSta;
Char buffer [1024];
Int len;
 
Char ipstr [INET_ADDRSTRLEN];
Void * addr;
 
If (argc! = 3 ){
Fprintf (stderr, "Usage: Not Server IP And Port! ");
Return 1;
}
 
Memset (& hints, 0, sizeof (hints ));
Hints. ai_family = AF_UNSPEC;
Hints. ai_socktype = SOCK_STREAM;
 
Status = getaddrinfo (argv [1], argv [2], & hints, & res );
 
If (status! = 0 ){
Fprintf (stderr, "Error, Server IP And Port! ");
Return 2;
}
 
Sockfd = socket (res-> ai_family, res-> ai_socktype, res-> ai_protocol );
 
If (sockfd = 0 ){
Fprintf (stderr, "Create, socket fail! ");
Return 3;
}
 
ConnSta = connect (sockfd, res-> ai_addr, res-> ai_addrlen );
 
If (connSta! = 0 ){
Fprintf (stderr, "Connect, Remote Host fail! ");
Return 4;
}
Else {
Struct sockaddr_in * ipv4 = (struct sockaddr_in *) res-> ai_addr;
Addr = & (ipv4-> sin_addr );

Inet_ntop (res-> ai_family, addr, ipstr, sizeof (ipstr ));

Printf ("Linked: Host = % s, Port = % d \ n", ipstr, ntohs (ipv4-> sin_port ));
}
 
 
RecvSta = recv (sockfd, buffer, sizeof (buffer), 0 );
 
Printf ("\ n % s \ n", buffer );
 
Freeaddrinfo (res );
Close (sockfd );
 
Return 0;
}

Server Side:

Getaddrinfo ()-> socket ()-> bind ()-> listen ()-> accept ()-> send ()

Code:

# Include <stdio. h>
# Include <string. h>
# Include <sys/types. h>
# Include <sys/socket. h>
# Include <netdb. h>
# Include <arpa/inet. h>
 
# Define SERVPORT "2349"
 
Int main (int argc, char * argv [])
{
Struct addrinfo hints, * res;
Int status;
Int sockfd;

Int connFd;
Struct sockaddr_in cliAddr;

Int sendSta;
Char * msg;

If (argc! = 2 ){
Fprintf (stderr, "Usage: Not found Read File ");
Return 1;
}

Memset (& hints, 0, sizeof (hints ));
Hints. ai_family = AF_UNSPEC;
Hints. ai_socktype = SOCK_STREAM;
Hints. ai_flags = AI_PASSIVE;

Status = getaddrinfo (NULL, SERVPORT, & hints, & res );

If (status! = 0 ){
Fprintf (stderr, "getaddrinfo, fail! ");
Return 2;
}

Sockfd = socket (res-> ai_family, res-> ai_socktype, res-> ai_protocol );

Bind (sockfd, res-> ai_addr, res-> ai_addrlen );

Listen (sockfd, 5 );

Printf ("========= Please Wait Client ===========\ n ");

While (1) {// loop forever!
Char ipstr [INET_ADDRSTRLEN];
Void * addr;

Int len = sizeof (cliAddr );
ConnFd = accept (sockfd, (struct sockaddr *) & cliAddr, & len );

/* View Client IP */
Struct sockaddr_in * ipv4 = (struct sockaddr_in *) & cliAddr;
Addr = & (ipv4-> sin_addr );

Inet_ntop (AF_INET, addr, ipstr, sizeof (ipstr ));
Printf ("client: % s \ n", ipstr );

/* Copy Data */
Msg = "Hello world! ";
SendSta = send (connFd, msg, strlen (msg), 0 );

Close (connFd );
}

Close (sockfd );
Return 0;
}

From the column xiaobin_HLJ80