Implementato alcuni server ricorsivi ed errori

12.3 nodes communication/daytimecli.c

@@ -0,0 +1,76 @@
+
+
+#include	"../basic.h"
+#include    <unistd.h>
+
+int main(int argc, char **argv) {
+	int			sockfd;
+	struct sockaddr_in	servaddr;
+
+	if (argc != 3){
+		printf("usage: daytimecli <indirizzoIP> <porta> \n");
+		exit(0);
+}
+        if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ){
+			printf("socket error\n");
+			exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family = AF_INET;
+        servaddr.sin_port = htons(atoi(argv[2])); /* server port */ 
+
+        if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){
+                printf("inet_pton error for %s\n", argv[1]);
+		exit(0);
+}
+	if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0){
+		printf("connect error\n");
+		exit(0);
+	}
+	
+	struct sockaddr_in	r_server_local_addr;
+	unsigned int r_server_local_addr_len = sizeof(r_server_local_addr);
+	
+	char * socket_buffer = (char *) malloc (r_server_local_addr_len) ;
+	int ridden;
+	ridden = read (sockfd, socket_buffer,r_server_local_addr_len );
+	fprintf(stdout,"Ho letto la prima volta %d bytes\n",ridden);
+	ridden = read (sockfd, socket_buffer,r_server_local_addr_len );
+	fprintf(stdout,"Ho letto la seconda volta %d bytes\n",ridden);
+
+
+	fprintf(stdout,"I'm sleeping for 20sec\n");
+	int  left = sleep(20);
+	if (left == 0){
+		  fprintf(stdout,"I'm here after 20 sec\n'");
+		}else{
+		  fprintf(stdout,"Waked up before 20 sec\n'");
+		}
+
+
+	ridden = read (sockfd, socket_buffer,r_server_local_addr_len );
+	if (ridden < 0){
+		fprintf(stdout,"Errore durante la lettura\n");
+		exit(-1);
+	} else {
+		fprintf(stdout,"Ho letto la terza volta %d bytes\n",ridden);
+	}
+
+
+
+
+	
+	memcpy (&r_server_local_addr,socket_buffer, r_server_local_addr_len);
+	
+	
+	char buff[INET_ADDRSTRLEN];
+	short port;
+	
+	inet_ntop(AF_INET, &(r_server_local_addr.sin_addr), buff, INET_ADDRSTRLEN);// get ip
+	port = ntohs(r_server_local_addr.sin_port);// get  port
+		
+	fprintf (stdout,"%s%c%hu\n",buff,':',port);
+	
+	
+	exit(0);
+}

12.3 nodes communication/daytimecli.c~

@@ -0,0 +1,31 @@
+/* Client che interroga un daytime server */
+
+#include	"../basic.h"
+
+int main(int argc, char **argv) {
+	int			sockfd, n;
+	char			recvline[MAXLINE + 1];
+	struct sockaddr_in	servaddr;
+
+	if (argc != 3){
+		printf("usage: daytimecli <indirizzoIP> <porta> \n");
+		exit(0);
+}
+        if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ){
+			printf("socket error\n");
+			exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family = AF_INET;
+        servaddr.sin_port = htons(atoi(argv[2])); /* server port */ 
+
+        if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){
+                printf("inet_pton error for %s\n", argv[1]);
+		exit(0);
+}
+	if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0){
+		printf("connect error\n");
+		exit(0);
+	}
+	exit(0);
+}

12.3 nodes communication/daytimesrv.c

@@ -0,0 +1,63 @@
+
+
+#include	"../basic.h"
+#include	<time.h>
+
+int main(int argc, char **argv) {
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+	char			buff[INET_ADDRSTRLEN];
+	short			port;
+
+	if (argc != 2 ){
+		printf("usage: daytimesrv <porta>\n");
+		exit(0);
+}
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		printf("socket error\n");
+		exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
+		printf("bind error\n"); exit(0);
+}
+	if( listen(listenfd, 5) < 0 )
+		{ printf("listen error\n");
+		  exit(0);
+		}
+
+	struct sockaddr_in	client_addr;
+	unsigned int client_addr_len = sizeof(client_addr);
+	
+	struct sockaddr_in	server_local_addr;
+	unsigned int server_local_addr_len = sizeof(server_local_addr);
+	
+	char * socket_buffer = (char *) malloc (server_local_addr_len) ;
+	
+	
+
+	for ( ; ; ) {
+		if( (connfd = accept(listenfd, (struct sockaddr *) &client_addr, &client_addr_len)) < 0)
+		{ printf("accept error\n");
+		exit(0);
+		} 
+
+		inet_ntop(AF_INET, &(client_addr.sin_addr), buff, INET_ADDRSTRLEN);// get client ip
+		port = ntohs(client_addr.sin_port);// get client port
+		
+		fprintf (stdout,"%s%c%hu\n",buff,':',port);
+		
+		
+		
+		getsockname (connfd, (struct sockaddr *) &server_local_addr, &server_local_addr_len);
+		memcpy (socket_buffer, &server_local_addr, server_local_addr_len);
+		write (connfd,socket_buffer, server_local_addr_len);
+		
+		
+		close(connfd);
+	}
+}

12.3 nodes communication/daytimesrv.c~

@@ -0,0 +1,41 @@
+/* stampa l'ip del client */
+
+#include	"../basic.h"
+#include	<time.h>
+
+int main(int argc, char **argv) {
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+	char			buff[MAXLINE];
+	time_t			ticks;
+
+	if (argc != 2 ){
+		printf("usage: daytimesrv <porta>\n");
+		exit(0);
+}
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		printf("socket error\n");
+		exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
+		printf("bind error\n"); exit(0);
+}
+	if( listen(listenfd, 5) < 0 )
+		{ printf("listen error\n");
+		  exit(0);
+}
+	for ( ; ; ) {
+		if( (connfd = accept(listenfd, (struct sockaddr *) NULL, NULL)) < 0)
+		{ printf("accept error\n"); exit(0);} else {
+		}
+
+		n=read(connfd, buff, MAXLINE);
+		fprintf (stdout,%s\n,buff);
+		close(connfd);
+	}
+}

12.3 nodes communication/makefile

@@ -0,0 +1,9 @@
+all : server client
+server : daytimesrv.o ../fun-corso-reti.o
+	gcc -o server daytimesrv.o ../fun-corso-reti.o
+client : daytimecli.o ../fun-corso-reti.o
+	gcc -o client daytimecli.o ../fun-corso-reti.o
+daytimesrv.o : daytimesrv.c ../basic.h
+	gcc -c -o daytimesrv.o daytimesrv.c
+fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
+	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c

12.3 nodes communication/makefile~

@@ -0,0 +1,8 @@
+server : daytimesrv.o ../fun-corso-reti.o
+	gcc -o server daytimesrv.o ../fun-corso-reti.o
+client : daytimecli.o ../fun-corso-reti.o
+	gcc -o client daytimecli.o ../fun-corso-reti.o
+daytimesrv.o : daytimesrv.c ../basic.h
+	gcc -c -o daytimesrv.o daytimesrv.c
+fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
+	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c

12.3 nodes communication/readme

@@ -0,0 +1,5 @@
+il server attende una connessione dal client e stampa ip e porta del client
+il client si connette al server e stampa ip e porta del server
+
+il client prova a leggere più volte, se non c’è niente da leggere le read dal socket restituisce 0.
+L’idea è fare due letture. prima della seconda killare il server in modo da verificare l’errore ricevuto se il client  prova  a leggere. dopo la prima lettura c’è un wait