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