134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <process.h>
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#include "common.h"
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#pragma comment(lib, "ws2_32.lib")
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typedef struct {
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SOCKET sock;
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uint8_t *recv_seq;
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struct sockaddr_in6 *peer;
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} recv_args;
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void receiver(void *arg) {
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recv_args *a = (recv_args *)arg;
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while (1) {
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(a->sock, &fds);
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TIMEVAL tv = {0, 100000};
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if (select(a->sock + 1, &fds, NULL, NULL, &tv) > 0) {
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struct packet rcv;
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recvfrom(a->sock, (char *)&rcv, sizeof(rcv), 0, NULL, NULL);
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rcv.payload[sizeof(rcv.payload) - 1] = '\0';
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if (rcv.type == TYPE_DATA) {
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if (rcv.seq == *a->recv_seq) {
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printf("\npeer: %s\n", rcv.payload);
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*a->recv_seq ^= 1;
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}
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rcv.type = TYPE_ACK;
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sendto(a->sock, (char *)&rcv, 2, 0,
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(struct sockaddr *)a->peer, sizeof(*a->peer));
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}
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}
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}
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}
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void send_with_stopwait(SOCKET sock,
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struct sockaddr_in6 *peer,
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struct packet *pkt, int pkt_len)
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{
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int addr_len = sizeof(*peer);
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while (1) {
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printf("Sending seq %d\n", pkt->seq);
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sendto(sock, (char *)pkt, pkt_len, 0,
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(struct sockaddr *)peer, addr_len);
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(sock, &fds);
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TIMEVAL tv;
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tv.tv_sec = TIMEOUT_SEC;
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tv.tv_usec = 0;
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int ret = select(sock + 1, &fds, NULL, NULL, &tv);
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printf("Select returned %d\n", ret);
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if (ret > 0) {
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struct packet ack;
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recvfrom(sock, (char *)&ack, sizeof(ack), 0, NULL, NULL);
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printf("Received ack seq %d type %d\n", ack.seq, ack.type);
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if (ack.type == TYPE_ACK && ack.seq == pkt->seq) {
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printf("Correct ACK received\n");
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return;
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}
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}
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printf("[timeout] retransmit\n");
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}
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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printf("用法: %s <对方IPv6地址>\n", argv[0]);
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return 1;
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}
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WSADATA wsa;
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WSAStartup(MAKEWORD(2, 2), &wsa);
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SOCKET sock = socket(AF_INET6, SOCK_DGRAM, 0);
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struct sockaddr_in6 local = {0};
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local.sin6_family = AF_INET6;
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local.sin6_addr = in6addr_any;
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local.sin6_port = htons(PORT);
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bind(sock, (struct sockaddr *)&local, sizeof(local));
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struct sockaddr_in6 peer = {0};
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peer.sin6_family = AF_INET6;
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peer.sin6_port = htons(PORT);
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if (inet_pton(AF_INET6, argv[1], &peer.sin6_addr) != 1) {
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printf("无效的 IPv6 地址\n");
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return 1;
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}
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uint8_t send_seq = 0;
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uint8_t recv_seq = 0;
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struct packet pkt;
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memset(&pkt, 0, sizeof(pkt));
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printf("Windows UDP IPv6 Stop-Wait Chat\n");
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// 启动接收线程
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recv_args args = {sock, &recv_seq, &peer};
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_beginthread(receiver, 0, &args);
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while (1) {
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printf(">> ");
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if (!fgets(pkt.payload, sizeof(pkt.payload), stdin))
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break;
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size_t len = strlen(pkt.payload);
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if (len > 0 && pkt.payload[len - 1] == '\n') pkt.payload[len - 1] = '\0';
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pkt.seq = send_seq;
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pkt.type = TYPE_DATA;
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int pkt_len = 2 + strlen(pkt.payload) + 1;
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send_with_stopwait(sock, &peer, &pkt, pkt_len);
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send_seq ^= 1;
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}
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closesocket(sock);
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WSACleanup();
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return 0;
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}
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