134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/ip_icmp.h>
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#define SRC_PORT 12000
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void stream_socket() {
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printf("\n=== STREAM SOCKET (TCP) ===\n");
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int sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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perror("socket");
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return;
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}
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struct sockaddr_in src = {0};
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src.sin_family = AF_INET;
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src.sin_addr.s_addr = inet_addr("127.0.0.1");
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src.sin_port = htons(SRC_PORT);
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if (bind(sock, (struct sockaddr*)&src, sizeof(src)) < 0) {
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perror("bind");
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close(sock);
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return;
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}
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struct sockaddr_in server = {0};
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server.sin_family = AF_INET;
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server.sin_port = htons(12001);
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inet_pton(AF_INET, "127.0.0.1", &server.sin_addr);
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printf("[*] Connecting to 127.0.0.1:12001...\n");
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if (connect(sock, (struct sockaddr*)&server, sizeof(server)) == 0) {
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printf("[+] Connected successfully!\n");
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const char *msg = "привет никифор";
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send(sock, msg, strlen(msg), 0);
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char buf[256] = {0};
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recv(sock, buf, sizeof(buf) - 1, 0);
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printf("[Response]:\n%s\n", buf);
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} else {
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perror("connect");
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}
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close(sock);
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}
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void datagram_socket() {
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printf("\n=== DATAGRAM SOCKET (UDP) ===\n");
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int sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0) {
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perror("socket");
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return;
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}
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struct sockaddr_in src = {0};
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src.sin_family = AF_INET;
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src.sin_addr.s_addr = inet_addr("127.0.0.1");
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src.sin_port = htons(SRC_PORT);
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if (bind(sock, (struct sockaddr*)&src, sizeof(src)) < 0) {
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perror("bind");
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close(sock);
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return;
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}
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struct sockaddr_in dest = {0};
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dest.sin_family = AF_INET;
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dest.sin_port = htons(12002);
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inet_pton(AF_INET, "127.0.0.1", &dest.sin_addr);
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const char *msg = "ялквмом!";
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printf("[*] Sending UDP datagram to 127.0.0.1:12002...\n");
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sendto(sock, msg, strlen(msg), 0, (struct sockaddr*)&dest, sizeof(dest));
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printf("[+] Datagram sent, waiting for response...\n");
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char buf[256];
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socklen_t addrlen = sizeof(dest);
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while (1) {
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ssize_t n = recvfrom(sock, buf, sizeof(buf) - 1, 0, (struct sockaddr*)&dest, &addrlen);
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if (n > 0) {
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buf[n] = '\0';
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printf("[Response]: \n%s\n", buf);
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break;
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} else {
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sleep(0.1);
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}
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}
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close(sock);
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}
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void raw_socket() {
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printf("\n=== RAW SOCKET (ICMP) ===\n");
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int sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
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if (sock < 0) {
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perror("socket");
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return;
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}
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struct sockaddr_in dest = {0};
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dest.sin_family = AF_INET;
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inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
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struct icmphdr icmp_hdr = {0};
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icmp_hdr.type = ICMP_ECHO;
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icmp_hdr.code = 0;
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icmp_hdr.checksum = 0xFFFF;
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printf("[*] Sending ICMP echo request to 8.8.8.8...\n");
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ssize_t sent = sendto(sock, &icmp_hdr, sizeof(icmp_hdr), 0,
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(struct sockaddr*)&dest, sizeof(dest));
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if (sent > 0)
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printf("[+] ICMP packet sent\n");
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else
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perror("sendto");
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close(sock);
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}
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int main() {
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stream_socket();
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sleep(1);
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datagram_socket();
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sleep(1);
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raw_socket();
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return 0;
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}
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