iniziamo esercizio database archiovio.txt

11.client-server-exam-database/daytimecli.c

@@ -0,0 +1,106 @@
+#include    "../basic.h"
+#include    <unistd.h>
+
+void sigpipeaction (int signal){
+    
+	int status, pid;
+    
+    fprintf(stderr, "Sigpipe catturato\n");
+    
+    
+}
+
+
+int main(int argc, char **argv) {
+    
+    
+    
+    struct sigaction sigpipestructure;
+    sigpipestructure.sa_handler = sigpipeaction;
+    sigpipestructure.sa_flags = 0;
+    
+    sigaction (SIGPIPE, &sigpipestructure, NULL);
+    
+    
+    
+    siginterrupt (SIGPIPE,1);
+    
+    
+    
+    
+	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;
+	int written;
+
+
+	sleep(5);
+    
+    int i;
+    for ( i = 0; i < 5; i ++){
+        
+	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  %d bytes\n",ridden);
+	}
+    }
+    
+    for ( i = 0; i < 1; i ++){
+        
+	written = write (sockfd, socket_buffer,r_server_local_addr_len /2  );
+	if (written < 0){
+		fprintf(stdout,"Errore durante la scrittura\n");
+		exit(-1);
+	} else {
+		fprintf(stdout,"Ho scritto  %d bytes\n",written);
+	}
+    }
+    
+
+  
+
+	
+	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);
+}

11.client-server-exam-database/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);
+}

11.client-server-exam-database/daytimesrv.c

@@ -0,0 +1,203 @@
+
+
+#include	"../basic.h"
+#include	<time.h>
+
+
+
+
+void sigchldaction (int signal){
+
+	int status, pid;
+     
+   for (pid = waitpid(-1,&status,WNOHANG);pid > 0;pid = waitpid(-1,&status,WNOHANG)){
+   	// server: child terminated
+   }  
+
+
+}
+
+
+
+typedef struct message {
+	char data [50];
+	char nome [50];
+	char voto [50];
+}t_message;
+
+int main(int argc, char **argv) {
+
+
+struct sigaction sigchldstructure;
+       sigchldstructure.sa_handler = sigchldaction;
+       sigchldstructure.sa_flags = 0;
+          
+sigaction (SIGCHLD, &sigchldstructure, NULL);
+
+
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+	char			buff[INET_ADDRSTRLEN]; // client ip grabbed redeable
+	short			port; // client port redeable
+
+	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);
+	
+	
+
+	for ( ; ; ) {
+		if( (connfd = accept(listenfd, (struct sockaddr *) &client_addr, &client_addr_len)) < 0)
+		{ 
+			if(errno == EINTR || errno==ECONNABORTED)
+				continue;
+			printf("accept error\n");
+			exit(1);
+		} 
+
+
+	    int split = fork();
+			
+			if ( split < 0) {
+				printf("fork for iterative server failed\n");
+				exit(-1);
+			}
+			
+			if (split == 0){
+				close(listenfd);
+
+				t_message m; // buffer message structure
+				int ridden, wrote;
+
+				sprintf ( m.data, "Benvenuto" );
+				wrote = write (connfd, &m, sizeof (m)  ); // scrivo benvenuto sul socket
+				// check wrote
+
+		
+				
+				inet_ntop(AF_INET, &(client_addr.sin_addr), buff, INET_ADDRSTRLEN); // get client address
+				port = ntohs(client_addr.sin_port);// get client port
+				//fprintf (stdout,"%s%c%hu\n",buff,':',port);  // print client address and port
+
+
+				for ( ; ; ) {// the server child reserve other requests from same client
+					ridden = read (connfd,&m,sizeof(m));
+					// check read. it's blocking
+
+					int fd;	
+
+					if (strcmp (m.data, "AGGIUNGI" ) == 0 ){
+						   fd = open ("archivio.txt",O_RDWR | O_APPEND);
+						   if (fd < 0){
+								fd = open ("archivio.txt", O_CREAT | O_RDWR | O_APPEND ,00700);
+						   }
+							if (fd < 0){
+						     	sprintf ( m.data, "Non posso modificare il database" );
+								wrote = write (connfd, &m, sizeof (m) ); // scrivo  sul socket
+								// check wrote
+							} else {
+
+							write (fd,(m.nome), strlen ((m.nome)));
+							write (fd," ", 1);
+							write (fd,(m.voto), strlen ((m.voto)) );
+							write (fd," ", 1);
+							write (fd,buff, strlen (buff));
+							write (fd,":", 1);
+
+							char port_char[50];
+							sprintf (port_char,"%hu",port);
+							write (fd,port_char, strlen (port_char));
+							write (fd,"\n", 1); 
+
+
+							sprintf ( m.data, "AGGIUNTO" );
+								wrote = write (connfd, &m, sizeof (m) ); // scrivo sul socket
+								// check wrote
+
+						    }
+					} else {
+						if (strcmp (m.data, "VERIFICA" ) == 0 ){
+
+							fd = open ("archivio.txt",O_RDONLY);
+							if (fd < 0){
+						     	sprintf ( m.data, "Non posso leggere il database" );
+								wrote = write (connfd, &m, sizeof (m)  ); // scrivo  sul socket
+								// check wrote
+							} else {
+
+								char  line [1000];
+								char  line_nome [50];
+								char  line_voto [50];
+								char  line_ip_port [50];
+								int returned,found;
+
+								found = 0;
+								FILE * fdfile = fdopen(fd,"r");
+								returned = fscanf (fdfile,"%999[^\n]%*c",line);
+								for( ; returned > 0 ;  fscanf (fdfile,"%999[^\n]%*c",line) ){
+
+									sscanf (line, "%s %s %s", line_nome, line_voto, line_ip_port);
+
+									if (strcmp (line_nome, m.nome) == 0){
+										found = 1;
+
+										sprintf ( m.data, "%s ha sostenuto l'esame con voto %s. Informazione fornita da %s ", line_nome, line_voto, line_ip_port );
+										wrote = write (connfd, &m, sizeof (m) ); // scrivo sul socket
+										// check wrote
+
+										break;
+									} 
+
+								}
+
+								if (found == 0){
+									sprintf ( m.data, "%s non ha sostenuto l'esame", &(m.nome) );
+									wrote = write (connfd, &m, sizeof (m)  ); // scrivo sul socket
+									// check wrote
+								}
+						    }
+
+						} else {
+
+						sprintf ( m.data, "Bye" );
+						wrote = write (connfd, &m, sizeof (m) ); // scrivo  sul socket
+						// check wrote
+
+						break; // end requests from client
+
+						}
+					}
+
+				}
+
+
+				exit(0); // server child served the client. end
+				
+			} else {
+				
+				close(connfd);
+			}
+		
+		
+	}
+}

11.client-server-exam-database/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);
+	}
+}

11.client-server-exam-database/makefile

@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS =
+all : server client
+
+server : daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
+client : daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
+daytimesrv.o : daytimesrv.c ../basic.h
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
+fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)

11.client-server-exam-database/makefile~

@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS =-std=c99
+all : server client
+
+server : daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
+client : daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
+daytimesrv.o : daytimesrv.c ../basic.h
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
+fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)