SimpleEventBuilder/event_builder.cxx

77 lines
2.0 KiB
C++

#include <arpa/inet.h>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
int makeSocket() {
int sockfd;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
return sockfd;
}
void bindSocketPort(int server_fd, int port) {
struct sockaddr_in localAddr;
localAddr.sin_family = AF_INET;
localAddr.sin_addr.s_addr = INADDR_ANY;
localAddr.sin_port = htons(port);
if (bind(server_fd, (struct sockaddr *)&localAddr, sizeof(localAddr)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
printf("FD %d bound to port %d\n", server_fd, port);
}
void startListening(int server_fd) {
if (listen(server_fd, 3) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
printf("FD %d listening to new connections\n", server_fd);
}
int acceptConnection(int server_fd) {
int client_fd;
struct sockaddr_in remoteAddr;
size_t addrlen = sizeof(remoteAddr);
if ((client_fd = accept(server_fd, (struct sockaddr *)&remoteAddr, (socklen_t *)&addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
printf("Connection from host %s, port %d, FD %d\n", inet_ntoa(remoteAddr.sin_addr), ntohs(remoteAddr.sin_port), client_fd);
return client_fd;
}
int main(int argc, char const *argv[]) {
if (argc != 2) {
printf("Usage: %s portNumber \n", argv[0]);
exit(EXIT_FAILURE);
}
int port = atoi(argv[1]);
printf("Start socket port %d\n", port);
int server_fd = makeSocket();
bindSocketPort(server_fd, port);
startListening(server_fd);
int client_fd = acceptConnection(server_fd);
while (true) {
uint32_t word;
ssize_t bytes = read(client_fd, &word, 4);
if (bytes != 4) {
perror("Receive failed");
exit(EXIT_FAILURE);
}
printf("[RICEVUTO]\t0x%x", word);
}
return 0;
}