X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=listati%2FUDP_daytimed.c;fp=listati%2FUDP_daytimed.c;h=f43853d17fa5fe6a9ba338da60e112ad77c53831;hp=0000000000000000000000000000000000000000;hb=6907e5e6ff5c69a34dc9d3664388cdb9f76ede82;hpb=d2027180b43e664093ce2bae3fb4fdf4942709cb

diff --git a/listati/UDP_daytimed.c b/listati/UDP_daytimed.c
new file mode 100644
index 0000000..f43853d
--- /dev/null
+++ b/listati/UDP_daytimed.c
@@ -0,0 +1,47 @@
+int main(int argc, char *argv[])
+{
+    int sock;
+    int i, n, len, verbose=0;
+    struct sockaddr_in addr;
+    char buffer[MAXLINE];
+    time_t timeval;
+    ...
+    /* create socket */
+    if ( (sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+	perror("Socket creation error");
+	exit(-1);
+    }
+    /* initialize address */
+    memset((void *)&addr, 0, sizeof(addr));     /* clear server address */
+    addr.sin_family = AF_INET;                  /* address type is INET */
+    addr.sin_port = htons(13);                  /* daytime port is 13 */
+    addr.sin_addr.s_addr = htonl(INADDR_ANY);   /* connect from anywhere */
+    /* bind socket */
+    if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+	perror("bind error");
+	exit(-1);
+    }
+    /* write daytime to client */
+    while (1) {
+	timeval = time(NULL);
+	n = recvfrom(sock, buffer, MAXLINE, 0, (struct sockaddr *)&addr, &len);
+	if (n < 0) {
+	    perror("recvfrom error");
+	    exit(-1);
+	}
+	if (verbose) {
+	    inet_ntop(AF_INET, &addr.sin_addr, buffer, sizeof(buffer));
+	    printf("Request from host %s, port %d\n", buffer,
+		   ntohs(addr.sin_port));
+	}
+	snprintf(buffer, sizeof(buffer), "%.24s\r\n", ctime(&timeval));
+	n = sendto(sock, buffer, strlen(buffer), 0, 
+		   (struct sockaddr *)&addr, sizeof(addr));
+	if (n < 0) {
+	    perror("sendto error");
+	    exit(-1);
+	}
+    }
+    /* normal exit */
+    exit(0);
+}