60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* Implementa un echo server che risponde alla porta definita dall'utente */
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/* Crea un figlio per ogni client */
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#include "../basic.h"
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void server_echo(int sockfd);
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int main(int argc, char **argv) {
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pid_t childpid;
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int listenfd, connfd;
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struct sockaddr_in servaddr, cliaddr;
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socklen_t cliaddr_len;
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if( argc != 2){
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printf("Usage: echosrv <PORT> \n"); exit(1);
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}
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if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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{ printf("socket error\n"); exit(1); }
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bzero(&servaddr, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr.s_addr = htonl(INADDR_ANY); /* wildcard address */
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servaddr.sin_port = htons(atoi(argv[1])); /* echo server */
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if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0)
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{ printf("bind error\n"); exit(1); }
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if( listen(listenfd, BACKLOG) < 0 )
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{ printf("listen error\n"); exit(1);}
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for ( ; ; ) {
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cliaddr_len = sizeof(cliaddr);
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if( (connfd = accept(listenfd, (struct sockaddr *) &cliaddr, &cliaddr_len)) < 0)
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{ printf("accept error\n"); exit(1); }
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if( (childpid = fork()) == 0 ) {
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close(listenfd);
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server_echo(connfd); /* svolge tutto il lavoro del server */
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exit(0);
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}
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close(connfd);
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}
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}
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void server_echo(int sockfd) {
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ssize_t n;
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char line[MAXLINE];
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for ( ; ; ) {
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if ( (n = reti_readline(sockfd, line, MAXLINE)) == 0)
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{
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printf("\n Connessione chiusa dal client \n");
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return; /* connection closed by other end */
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}
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reti_writen(sockfd, line, n);
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}
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}
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