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subscriber.c
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subscriber.c
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#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/tcp.h>
#include <math.h>
#include "helpers.h"
void print_message(udp_message message, char *buf) {
char type[15];
memset(type, 0, sizeof(type));
if (message.data_type == 0) {
strcpy(type, "INT");
type[3] = '\0';
int nr, signed_nr;
memcpy(&nr, buf + 52, sizeof(uint32_t));
if ((int)buf[51] == 0) {
signed_nr = ntohl(nr);
} else {
signed_nr = -ntohl(nr);
}
printf("%s:%d - %.50s - %s - %d\n", inet_ntoa(message.serv.sin_addr), ntohs(message.serv.sin_port),
message.topic, type, signed_nr);
} else if (message.data_type == 1) {
strcpy(type, "SHORT_REAL");
type[10] = '\0';
uint16_t nr;
memcpy(&nr, buf + 51, sizeof(uint16_t));
double short_nr = ntohs(nr) / 100.00;
printf("%s:%d - %.50s - %s - %.2f\n", inet_ntoa(message.serv.sin_addr), ntohs(message.serv.sin_port),
message.topic, type, short_nr);
} else if (message.data_type == 2) {
strcpy(type, "FLOAT");
type[5] = '\0';
uint32_t nr;
uint8_t pw;
double signed_nr, p = 1;
memcpy(&nr, buf + 52, sizeof(uint32_t));
memcpy(&pw, buf + 52 + sizeof(uint32_t), sizeof(uint8_t));
for (int k = 0; k < pw; k++) {
p = p / 10;
}
if ((int)buf[51] == 0) {
signed_nr = ntohl(nr) * 1.00 * p;
} else {
signed_nr = -(ntohl(nr) * 1.00 * p);
}
message.topic[strlen(message.topic)] = '\0';
printf("%s:%d - %.50s - %s - %.4f\n", inet_ntoa(message.serv.sin_addr), ntohs(message.serv.sin_port),
message.topic, type, signed_nr);
} else if (message.data_type == 3) {
strcpy(type, "STRING");
type[6] = '\0';
message.topic[strlen(message.topic)] = '\0';
message.content[strlen(message.content)] ='\0';
printf("%s:%d - %.50s - %s - %.1500s\n", inet_ntoa(message.serv.sin_addr), ntohs(message.serv.sin_port),
message.topic, type, message.content);
}
}
int main(int argc, char *argv[]) {
int sockfd = -1;
char buf[2000] = {0};
setvbuf(stdout, NULL, _IONBF, BUFSIZ);
uint16_t port;
int rc = sscanf(argv[3], "%hu", &port);
DIE(rc != 1, "Given port is invalid");
port = atoi(argv[3]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
DIE(sockfd < 0, "socket");
struct sockaddr_in serv_addr;
socklen_t socket_len = sizeof(struct sockaddr_in);
memset(&serv_addr, 0, socket_len);
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
rc = inet_pton(AF_INET, argv[2], &serv_addr.sin_addr.s_addr);
DIE(rc <= 0, "inet_pton");
rc = connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
DIE(rc < 0, "connect");
rc = send(sockfd, argv[1], strlen(argv[1]), 0);
struct pollfd poll_fds[3];
poll_fds[0].fd = STDIN_FILENO;
poll_fds[0].events = POLLIN;
poll_fds[1].fd = sockfd;
poll_fds[1].events = POLLIN;
int enable = 1;
if (setsockopt(sockfd, SOL_TCP, TCP_NODELAY, &enable, sizeof(int)) < 0)
perror("setsockopt(SO_REUSEADDR) failed");
protocol_message message_to_send;
while (1)
{
rc = poll(poll_fds, 2, -1);
DIE(rc < 0, "poll");
for (int i = 0; i < 2; i++) {
if (poll_fds[i].revents & POLLIN) {
if (poll_fds[i].fd == sockfd) {
memset(buf, 0, sizeof(buf));
memset(&message_to_send, 0, sizeof(protocol_message));
rc = recv(sockfd, &message_to_send, sizeof(protocol_message), 0);
DIE(rc < 0, "recv");
if (message_to_send.type == 0) {
close(sockfd);
return 0;
} else if (message_to_send.type == 1) {
udp_message message = {0};
strncpy(message.topic, message_to_send.buf, 50);
message.data_type = message_to_send.buf[50];
strncpy(message.content, message_to_send.buf + 51, 1500);
message.serv.sin_addr = serv_addr.sin_addr;
message.serv.sin_port = serv_addr.sin_port;
print_message(message, message_to_send.buf);
break;
}
} else if (poll_fds[i].fd == STDIN_FILENO) {
fgets(buf, sizeof(buf), stdin);
memcpy(message_to_send.buf, buf, sizeof(buf));
if (!strncmp(buf, "exit", 4)) {
message_to_send.type = 0;
rc = send(sockfd, &message_to_send, sizeof(protocol_message), 0);
DIE(rc < 0, "recv");
close(sockfd);
return 0;
} else if (!strncmp(buf, "subscribe", 9)) {
message_to_send.type = 2;
rc = send(sockfd, &message_to_send, sizeof(protocol_message), 0);
DIE(rc < 0, "recv");
char *topic = strtok(buf, " ");
topic = strtok(NULL, " ");
topic[strlen(topic) - 1] = '\0';
printf("Subscribed to topic %s\n", topic);
break;
} else if (!strncmp(buf, "unsubscribe", 11)) {
message_to_send.type = 3;
rc = send(sockfd, &message_to_send, sizeof(protocol_message), 0);
DIE(rc < 0, "recv");
char *topic = strtok(buf, " ");
topic = strtok(NULL, " ");
topic[strlen(topic) - 1] = '\0';
printf("Unsubscribed from topic %s\n", topic);
break;
}
}
}
}
}
close(sockfd);
return 0;
}