5 changed files with 313 additions and 10 deletions
@ -0,0 +1,56 @@ |
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#include "helpers.h" |
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int create_socket(uint16_t port) { |
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int sock; |
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struct sockaddr_in socket_name; |
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// Creates the socket
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sock = socket (PF_INET, SOCK_STREAM, 0); //TODO: check if PF_INET is the right one
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if (sock < 0) { |
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perror("Couldn't create the socket."); |
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exit(EXIT_FAILURE); |
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} |
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// Gives the socket a name
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socket_name.sin_family = AF_INET; |
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socket_name.sin_port = htons(port); |
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socket_name.sin_addr.s_addr = htonl(INADDR_ANY); |
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// Binds own address structure to socket
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if (bind(sock, (struct sockaddr *) &socket_name, sizeof(socket_name)) < 0) { |
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perror("Couldn't bind the address structure to the socket."); |
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exit(EXIT_FAILURE); |
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} |
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return sock; |
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} |
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int read_from_client(int file_des, uint16_t max_line) { |
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char buffer[max_line]; |
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int nbytes; |
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nbytes = read(file_des, buffer, sizeof(buffer)); |
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if (nbytes < 0) { |
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perror("Couldn't read from client."); |
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exit(EXIT_FAILURE); |
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} else if (nbytes == 0) |
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// End-of-file
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return -1; |
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else { |
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fprintf(stderr, "Server: got message: `%s'\n", buffer); |
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return 0; |
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} |
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} |
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void init_sockaddr(struct sockaddr_in *name, const char *hostname, uint16_t port) { |
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struct hostent *hostinfo; |
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name->sin_family = AF_INET; |
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name->sin_port = htons(port); |
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hostinfo = gethostbyname(hostname); |
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if (hostinfo == NULL) { |
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fprintf(stderr, "Unknown host %s.\n", hostname); |
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exit(EXIT_FAILURE); |
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} |
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name->sin_addr = *(struct in_addr *) hostinfo->h_addr_list[0]; |
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} |
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@ -0,0 +1,21 @@ |
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#ifndef HELPERS_H_ |
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#define HELPERS_H_ |
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#include <stdio.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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#include <arpa/inet.h> |
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#include <sys/select.h> |
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|
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int create_socket(uint16_t port); |
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int read_from_client(int file_des, uint16_t max_line); |
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void init_sockaddr(struct sockaddr_in *name, const char *hostname, uint16_t port); |
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#endif //HELPERS_H_
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@ -0,0 +1,155 @@ |
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#include "zaqar.h" |
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#define MESSAGE "You got mail!!! xo xo xo" |
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volatile sig_atomic_t out_flag = false; |
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void write_to_server(int filedes) { |
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int nbytes; |
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nbytes = write(filedes, MESSAGE, strlen(MESSAGE) + 1); |
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if (nbytes < 0) { |
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perror("write"); |
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exit(EXIT_FAILURE); |
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} |
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} |
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void handle_alarm(int sig) { |
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if (sig == SIGALRM) { |
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out_flag = true; |
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int sock; |
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struct sockaddr_in servername; |
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printf("GOT_CL1\n"); |
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/* Create the socket. */ |
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sock = socket (PF_INET, SOCK_STREAM, 0); |
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if (sock < 0) { |
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perror("socket (client)"); |
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exit(EXIT_FAILURE); |
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} |
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/* Connect to the server. */ |
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init_sockaddr (&servername, "10.0.88.79", PORT); |
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if (connect(sock, (struct sockaddr *) &servername, sizeof (servername))) { |
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printf("GOT_CL2\n"); |
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//perror("connect (client)");
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//exit(EXIT_FAILURE);
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} else { |
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printf("GOT_CL3\n"); |
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/* Send data to the server. */ |
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write_to_server(sock); |
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} |
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//close (sock);
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} |
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} |
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int main(void) { |
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int sock; |
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fd_set active_fd_set, read_fd_set; |
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struct sockaddr_in client_name; |
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size_t size; |
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alarm(0); |
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//signal(SIGALRM, handle_alarm);
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struct itimerval new; |
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new.it_interval.tv_usec = 0; |
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new.it_interval.tv_sec = 8; |
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new.it_value.tv_usec = 0; |
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new.it_value.tv_sec = 8; |
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if (setitimer (ITIMER_REAL, &new, NULL) == -1) { |
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perror("Couldn't set timer."); |
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exit(EXIT_FAILURE); |
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} |
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sigset_t mask; |
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int sfd; |
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struct signalfd_siginfo fdsi; |
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sigemptyset(&mask); |
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sigaddset(&mask, SIGALRM); |
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/*if (sigprocmask(SIGALRM, &mask, NULL) == -1)
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perror("sigprocmask");*/ |
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sfd = signalfd(-1, &mask, 0); |
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if (sfd == -1) |
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perror("signalfd"); |
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// Creates the socket and sets it up to accept connections
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sock = create_socket(PORT); |
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if (listen(sock, BACKLOG_SIZE) < 0) { |
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perror("Couldn't listen for connections on the socket."); |
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exit(EXIT_FAILURE); |
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} |
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printf("GOT_SV1\n"); |
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// Initializes the set of active sockets
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// Clears the descriptor set
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FD_ZERO(&active_fd_set); |
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// Sets socket in active readset
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FD_SET(sock, &active_fd_set); |
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FD_SET(sfd, &active_fd_set); |
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while (1) { |
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printf("GOT_SV2\n"); |
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// Shallow copies the readset
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read_fd_set = active_fd_set; |
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// Blocks until input arrives on one or more active sockets
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if (select(FD_SETSIZE, &read_fd_set, NULL, NULL, NULL) < 0) { |
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if (out_flag) { |
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printf("GOT_SV2.1\n"); |
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out_flag = false; |
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continue; |
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} |
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printf("GOT_SV2.2\n"); |
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perror("Couldn't initiate synchronous I/O multiplexing."); |
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exit(EXIT_FAILURE); |
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} |
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// Services all the sockets with input pending
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for (int i = 0; i < FD_SETSIZE; ++i) { //TODO: is this needed?
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if (FD_ISSET(i, &read_fd_set)) { |
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printf("GOT_SV3\n"); |
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if (i == sock) { |
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// Connection request on original socket
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size = sizeof(client_name); |
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int new = accept(sock, (struct sockaddr *) &client_name, &size); |
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if (new < 0) { |
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perror("Couldn't accept the connection."); |
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exit(EXIT_FAILURE); |
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} |
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fprintf(stderr, "Server: connect from host %s, port %hd.\n", |
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inet_ntoa(client_name.sin_addr), ntohs(client_name.sin_port)); |
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FD_SET(new, &active_fd_set); |
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} else if (i == sfd) { |
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ssize_t s = read(sfd, &fdsi, sizeof(struct signalfd_siginfo)); |
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if (s != sizeof(struct signalfd_siginfo)) |
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perror("read"); |
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if (fdsi.ssi_signo == SIGALRM) { |
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printf("Got SIGALRM\n"); |
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handle_alarm(SIGALRM); |
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} else { |
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printf("Read unexpected signal\n"); |
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} |
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} else { |
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// Data arriving on an already-connected socket
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if (read_from_client(i, MAXLINE) < 0) { |
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close(i); |
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FD_CLR(i, &active_fd_set); |
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} |
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} |
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} |
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} |
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printf("GOT_SV4\n"); |
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} |
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return 0; |
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} |
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@ -0,0 +1,27 @@ |
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#ifndef ZAQAR_H_ |
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#define ZAQAR_H_ |
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#include <stdbool.h> |
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#include <signal.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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#include <arpa/inet.h> |
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#include <sys/select.h> |
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#include <sys/time.h> |
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#include <sys/signalfd.h> |
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#include "helpers.h" |
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#define PORT 5000 |
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#define MAXLINE 1024 |
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#define BACKLOG_SIZE 2 |
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#endif //ZAQAR_H_
|
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