72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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void handle_arguments(int argc, char *argv[]) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s PORT\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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}
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void run_server(int port) {
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// create a socket using Internet protocol
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int sockfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sockfd == -1) {
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perror("socket");
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exit(EXIT_FAILURE);
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}
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struct sockaddr_in serv_addr, client_addr;
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socklen_t client_addr_len = sizeof(client_addr);
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memset(&serv_addr, 0, sizeof(serv_addr));
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memset(&client_addr, 0, sizeof(client_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_port = htons(port);
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serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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// bind sockfd to serv_addr
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int rv = bind(sockfd, (const struct sockaddr *)&serv_addr, sizeof(serv_addr));
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if (rv == -1) {
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perror("bind");
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exit(EXIT_FAILURE);
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}
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rv = listen(sockfd, 5);
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if (rv == -1) {
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perror("listen");
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exit(EXIT_FAILURE);
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}
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int accfd = accept(sockfd, (struct sockaddr *)&client_addr, &client_addr_len);
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if (accfd == -1) {
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perror("accept");
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exit(EXIT_FAILURE);
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}
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size_t buffer_size = sizeof(uint32_t);
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union {
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uint32_t number;
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char array[buffer_size];
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} buffer;
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memset(&buffer, 0, buffer_size);
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while (1) {
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read(accfd, buffer.array, buffer_size);
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printf("%d\n", ntohl(buffer.number));
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write(accfd, buffer.array, buffer_size);
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memset(&buffer, 0, buffer_size);
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}
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}
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int main(int argc, char *argv[]) {
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handle_arguments(argc, argv);
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run_server(strtol(argv[1], NULL, 10));
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return 0;
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} |