TCP/IP 广播的发送和接收

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：

接收端：

接收端或者绑定的ip设为0

转载于:https://www.cnblogs.com/pengdonglin137/archive/2013/03/16/2963464.html

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