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\n"};
40:
41:
42: if((sockfd = socket(PF_INET, SOCK_DGRAM, 0) ) < 0)
43: {
44: perror("fail to socket");
45: exit(-1);
46: }
47:
48:
49: bzero(&broad_addr, sizeof(struct sockaddr_in));
50:
51: broad_addr.sin_family = PF_INET;
52: broad_addr.sin_port = htons(atoi(argv[2]));
53: broad_addr.sin_addr.s_addr = inet_addr(argv[1]);
54:
55: while(1)
56: {
57: sendto(sockfd,buffer, N, 0, (SA *)&broad_addr, sizeof(broad_addr));
58: sleep(1);
59: }
60:
61: return 0;
62: }
接收端：
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: struct sockaddr_in broad_addr, peeraddr;
37: socklen_t peerlen = sizeof(peeraddr);
38: char buffer[N];
39: struct ip_mreq mreq;
40:
41:
42: if((sockfd = socket(PF_INET, SOCK_DGRAM, 0) ) < 0)
43: {
44: perror("fail to socket");
45: exit(-1);
46: }
47:
48: bzero(&mreq, sizeof(mreq));
49: mreq.imr_multiaddr.s_addr = inet_addr("224.10.10.1");
50: mreq.imr_interface.s_addr = htonl(INADDR_ANY);
51: setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
52:
53:
54: bzero(&broad_addr, sizeof(struct sockaddr_in));
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: }
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