Rinominate le prime versioni dei vari programmi in Elem, la versione piu`

[gapil.git] / sources / ElemEchoTCPServer.c

diff --git a/sources/ElemEchoTCPServer.c b/sources/ElemEchoTCPServer.c
new file mode 100644 (file)
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+++ b/sources/ElemEchoTCPServer.c
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+/****************************************************************
+ *
+ * Program echo_tcp_server.c: 
+ * Elementary TCP server for echo service (port 7)
+ *
+ * Author: Simone Piccardi
+ * Jun. 2001
+ *
+ * Usage: echod
+ *
+ * $Id: ElemEchoTCPServer.c,v 1.1 2001/06/18 21:46:14 piccardi Exp $ 
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <sys/types.h>   /* predefined types */
+#include <unistd.h>      /* include unix standard library */
+#include <arpa/inet.h>   /* IP addresses conversion utiliites */
+#include <sys/socket.h>  /* socket library */
+#include <stdio.h>      /* include standard I/O library */
+#include <time.h>
+
+#include "wrappers.h"
+
+#define BACKLOG 10
+#define MAXLINE 256
+
+/* Subroutines declaration */
+void usage(void);
+void SockEcho(int sockfd);
+/* Program beginning */
+int main(int argc, char *argv[])
+{
+/* 
+ * Variables definition  
+ */
+    int list_fd, conn_fd;
+    pid_t pid;
+    struct sockaddr_in serv_add;
+    /*
+     * Input section: decode parameters passed in the calling 
+     * Use getopt function
+     */
+    int i;
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "h")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':  
+           printf("Wrong -h option use\n");
+           usage();
+           return(0);
+           break;
+       case '?':   /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:    /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    /* create socket */
+    if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+       perror("Socket creation error");
+       exit(-1);
+    }
+    /* initialize address */
+    memset((void *)&serv_add, 0, sizeof(serv_add)); /* clear server address */
+    serv_add.sin_family = AF_INET;                  /* address type is INET */
+    serv_add.sin_port = htons(7);                   /* echo port is 7 */
+    serv_add.sin_addr.s_addr = htonl(INADDR_ANY);   /* connect from anywhere */
+    /* bind socket */
+    if (bind(list_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
+       perror("bind error");
+       exit(-1);
+    }
+    /* listen on socket */
+    if (listen(list_fd, BACKLOG) < 0 ) {
+       perror("listen error");
+       exit(-1);
+    }
+    /* handle echo to client */
+    while (1) {
+       /* accept connection */
+       if ( (conn_fd = accept(list_fd, NULL, NULL)) < 0) {
+           perror("accept error");
+           exit(-1);
+       }
+       /* fork to handle connection */
+       if ( (pid = fork()) < 0 ){
+           perror("fork error");
+           exit(-1);
+       }
+       if (pid == 0) {      /* child */
+           close(list_fd);          /* close listening socket */   
+           SockEcho(conn_fd);       /* handle echo */
+           exit(0);
+       } else {             /* parent */
+           close(conn_fd);          /* close connected socket */
+       }
+    }
+    /* normal exit, never reached */
+    exit(0);
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Simple daytime server\n");
+    printf("Usage:\n");
+    printf("  daytimed [-h] \n");
+    printf("  -h          print this help\n");
+    exit(1);
+}
+/*
+ * routine to handle echo for connection
+ */
+void SockEcho(int sockfd) {
+    char buffer[MAXLINE];
+    int nread, nwrite;
+    
+    /* main loop, reading 0 char means client close connection */
+    while ( (nread = read(sockfd, buffer, MAXLINE)) != 0) {
+       printf("Letti %d bytes, %s ", nread, buffer);
+       nwrite = SockWrite(sockfd, buffer, nread);
+    }
+    return;
+}