TCP/IP 广播的发送和接收

分手后的思念是犯贱 2022-04-10 09:15 271阅读 0赞

发送端：

1:  /*

2:   * =====================================================================================

3:   *

4:   *       Filename:  client.c

5:   *

6:   *    Description:

7:   *

8:   *        Version:  1.0

9:   *        Created:  03/14/2013 01:48:12 PM

10:   *       Revision:  none

11:   *       Compiler:  gcc

12:   *

13:   *         Author:  YOUR NAME (),

14:   *        Company:

15:   *

16:   * =====================================================================================

17:   */

18:

19:  #include <stdio.h>

20:  #include <sys/socket.h>

21:  #include <netinet/in.h>

22:  #include <arpa/inet.h>

23:  #include <stdlib.h>

24:  #include <strings.h>

25:  #include <string.h>

26:  #include <unistd.h>

27:

28:  #define N 256

29:

30:  typedef struct sockaddr SA;

31:

32:  int main(int argc, char *argv[])

33:  {

34:

35:      int sockfd;

36:      int on = 1;

37:      socklen_t optlen = sizeof(on);

38:      struct sockaddr_in broad_addr;

39:      char buffer[N] = {
        "pengdonglin"};

40:

41:

42:      if(argc < 3)

43:      {

44:          printf("usage: %s <ip> <port>\n",argv[0]);

45:          exit(-1);

46:      }

47:      if((sockfd = socket(PF_INET, SOCK_DGRAM, 0) ) < 0)

48:      {

49:          perror("fail to socket");

50:          exit(-1);

51:      }

52:

53:      if(setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &on, optlen) < 0)

54:      {

55:          perror("fail to getsockopt");

56:          exit(-1);

57:      }

58:

59:      bzero(&broad_addr, sizeof(struct sockaddr_in));

60:

61:      broad_addr.sin_family = PF_INET;

62:      broad_addr.sin_port = htons(atoi(argv[2]));

63:      broad_addr.sin_addr.s_addr = inet_addr(argv[1]);

64:

65:      while(1)

66:      {

67:          sendto(sockfd,buffer, N, 0, (SA *)&broad_addr, sizeof(broad_addr));

68:          sleep(1);

69:      }

70:

71:      return 0;

72:  }

接收：

1:  /*

2:   * =====================================================================================

3:   *

4:   *       Filename:  client.c

5:   *

6:   *    Description:

7:   *

8:   *        Version:  1.0

9:   *        Created:  03/14/2013 01:48:12 PM

10:   *       Revision:  none

11:   *       Compiler:  gcc

12:   *

13:   *         Author:  YOUR NAME (),

14:   *        Company:

15:   *

16:   * =====================================================================================

17:   */

18:

19:  #include <stdio.h>

20:  #include <sys/socket.h>

21:  #include <netinet/in.h>

22:  #include <arpa/inet.h>

23:  #include <stdlib.h>

24:  #include <strings.h>

25:  #include <string.h>

26:  #include <unistd.h>

27:

28:  #define N 256

29:

30:  typedef struct sockaddr SA;

31:

32:  int main(int argc, char *argv[])

33:  {

34:

35:      int sockfd;

36:      struct sockaddr_in broad_addr, peeraddr;

37:      socklen_t peerlen = sizeof(peeraddr);

38:      char buffer[N];

39:

40:      if(argc < 3)

41:      {

42:          printf("usage: %s <ip> <port>\n",argv[0]);

43:          exit(-1);

44:      }

45:

46:      if((sockfd = socket(PF_INET, SOCK_DGRAM, 0) ) < 0)

47:      {

48:          perror("fail to socket");

49:          exit(-1);

50:      }

51:

52:

53:      bzero(&broad_addr, sizeof(struct sockaddr_in));

54:

55:      broad_addr.sin_family = PF_INET;

56:      broad_addr.sin_port = htons(atoi(argv[2]));

57:      broad_addr.sin_addr.s_addr = inet_addr(argv[1]);

58:

59:      if(bind(sockfd, (SA *)&broad_addr, sizeof(broad_addr)) < 0)

60:      {

61:          perror("fail to bind");

62:          exit(-1);

63:      }

64:      while(1)

65:      {

66:          recvfrom(sockfd, buffer, N, 0, (SA *)&peeraddr, &peerlen);

67:

68:          printf("%s : %d  : %s\n", inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port),buffer);

69:      }

70:

71:      return 0;

72:  }

运行：

发送端：

[![image][]][image 1]

接收端：

[![image][image 2]][image_image 2]

接收端或者绑定的ip设为0

[![image][image 3]][image_image 3]

[image]: /images/20220401/da7f8be1eb9341baa7c254f273e2661c.png
[image 1]: https://images0.cnblogs.com/blog/480488/201303/16160440-91fc776cafa44535897bdffcb93ea8ab.png
[image 2]: https://images0.cnblogs.com/blog/480488/201303/16160441-ac259909d70e469fb2769f99b62206fe.png
[image_image 2]: /images/20220401/8223ddff2845483b9c410dc0266d103c.png
[image 3]: https://images0.cnblogs.com/blog/480488/201303/16160442-2ef14d9d17064838a448586c616713a8.png
[image_image 3]: /images/20220401/301b607d42974d6eb449e9f7a386e590.png