added sock20

TMP/Practice/sock20.10.23/s3.c

@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#define errExit(msg)    do { perror(msg); _exit(EXIT_FAILURE); } while (0)
+
+#define SOCK_PATH  "/tmp/unix_sock.server"
+#define DATA "Hello from server"
+#define BUF 128
+#define FIN "exit"
+
+int session(int client_sock, struct sockaddr_un server_sockaddr, struct sockaddr_un client_sockaddr){     
+ int rc;
+ char inbuf[BUF];
+ char outbuf[BUF];
+ int bytes_rec = 0;
+ size_t bs = BUF;
+ socklen_t len;
+   len = sizeof(client_sockaddr);
+   rc = getpeername(client_sock, (struct sockaddr *) &client_sockaddr, &len);
+   if (rc == -1){
+      close(client_sock);
+      errExit("getpeer");
+   } else {
+      printf("Client socket filepath: %s\n", client_sockaddr.sun_path);
+   }
+    
+   printf("waiting to read...\n");
+   memset(inbuf, 0, bs);                
+   bytes_rec = recv(client_sock, inbuf, bs, 0);
+   if (bytes_rec == -1){
+      close(client_sock);
+      errExit("recv");
+   } else {
+      printf("DATA RECEIVED = %s\n", inbuf);
+   }
+    
+   memset(outbuf, 0, bs);
+   strcpy(outbuf, DATA);      
+   printf("Sending data...\n");
+   rc = send(client_sock, outbuf, strlen(outbuf), 0);
+   if (rc == -1) {
+      close(client_sock);
+      errExit("send");
+   } else {
+      printf("Data sent!\n");
+   }
+   close(client_sock);
+   return strcmp(inbuf,FIN);
+}
+
+
+int main(void){
+
+ int server_sock, client_sock, rc;
+ socklen_t len;
+ struct sockaddr_un server_sockaddr;
+ struct sockaddr_un client_sockaddr;     
+ int backlog = 10;
+
+ len = sizeof(server_sockaddr);
+ memset(&server_sockaddr, 0, sizeof(struct sockaddr_un));
+ memset(&client_sockaddr, 0, sizeof(struct sockaddr_un));
+    
+ server_sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (server_sock == -1) errExit("socket");
+    
+ server_sockaddr.sun_family = AF_UNIX;   
+ strcpy(server_sockaddr.sun_path, SOCK_PATH); 
+    
+ unlink(SOCK_PATH);
+ rc = bind(server_sock, (struct sockaddr *) &server_sockaddr, len);
+ if (rc == -1){
+    close(server_sock);
+    errExit("bind");
+ }
+    
+ rc = listen(server_sock, backlog);
+ if (rc == -1){
+    close(server_sock);
+    errExit("listen");
+ }
+
+ printf("socket listening...\n");
+
+ do {
+   client_sock = accept(server_sock, (struct sockaddr *) &client_sockaddr, &len);
+   if (client_sock == -1){
+      close(server_sock);
+      close(client_sock);
+      errExit("accept");
+   }
+ } while (session(client_sock,server_sockaddr,client_sockaddr));
+   
+
+ close(server_sock);
+ unlink(SOCK_PATH);
+    
+ return 0;
+}