質問編集履歴
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実行結果追加
test
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File without changes
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test
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単純なUDPのサーバーを実装したくてC言語でコードを途中まで書きました。
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単純なUDPのサーバー,クライアントを実装したくてC言語でコードを途中まで書きました。clientの方でACKの値が戻るようにしたいですが、ここからどうコードを書けばいいかわかりません。具体的なコードを教えて下さい。
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```
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```udpserver
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//udpserver.c
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#include <stdio.h>
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@@ -152,6 +154,8 @@
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*/
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ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *their_addr, socklen_t addrlen);
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freeaddrinfo(servinfo);
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@@ -163,3 +167,177 @@
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}
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```
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```udpclient
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//udpclient.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#define SERVERPORT "4567" // the port that client will be connecting to
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#define MAXBUFLEN 100
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int main(int argc, char *argv[])
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{
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int sockfd;
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struct addrinfo hints, *servinfo, *p;
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struct sockaddr_storage their_addr;
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socklen_t addr_len;
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int rv;
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int numbytes;
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char buf[MAXBUFLEN];
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if (argc != 3) {
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fprintf(stderr,"usage: talker hostname message\n");
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exit(1);
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}
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memset(&hints, 0, sizeof hints);
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_DGRAM;
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if ((rv = getaddrinfo(argv[1], SERVERPORT, &hints, &servinfo)) != 0) {
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fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
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return 1;
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}
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// loop through all the results and make a socket
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for(p = servinfo; p != NULL; p = p->ai_next) {
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if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
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perror("talker: socket");
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continue;
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}
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break;
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}
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if (p == NULL) {
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fprintf(stderr, "talker: failed to create socket\n");
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return 2;
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}
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// Send to server
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if ((numbytes = sendto(sockfd, argv[2], strlen(argv[2]), 0, p->ai_addr, p->ai_addrlen)) == -1) {
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perror("client: sendto");
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exit(1);
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}
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//Receive from server
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ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const
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struct sockaddr *dest_addr, socklen_t addrlen);
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/*
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Complete this part
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*/
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printf("Received from server: %s\n", buf);
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freeaddrinfo(servinfo);
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close(sockfd);
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return 0;
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}
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```
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現在の実行結果
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```terminal
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324
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325
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gcc udpserver.c
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326
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327
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./a.out
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328
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329
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server: waiting for client...
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330
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331
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Received from client: Hello
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332
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333
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334
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335
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336
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337
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gcc udpclient.c
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338
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339
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./a.out 127.0.0.1 Hello
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340
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341
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Received from server: �*��z```
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342
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343
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+
```
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