Created
September 11, 2012 01:03
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in c/s,the listerner.
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <errno.h> | |
| #include <string.h> | |
| #include <sys/types.h> | |
| #include <netinet/in.h> | |
| #include <sys/socket.h> | |
| #include <sys/wait.h> | |
| #define MYPORT 5000 | |
| #define MAXBUFLEN 100 | |
| int main(int argc, char **argv) | |
| { | |
| int sockfd; | |
| struct sockaddr_in my_addr, their_addr; | |
| int addr_len, numbytes; | |
| char buf[MAXBUFLEN]; | |
| if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) | |
| { | |
| perror("socket"); | |
| exit(1); | |
| } | |
| my_addr.sin_family = AF_INET; | |
| my_addr.sin_port = htons(MYPORT); | |
| my_addr.sin_addr.s_addr = INADDR_ANY; | |
| bzero(&(my_addr.sin_zero),8); | |
| if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr)) == -1) | |
| { | |
| perror("bind"); | |
| exit(1); | |
| } | |
| addr_len = sizeof(struct sockaddr); | |
| if((numbytes = recvfrom(sockfd,buf,MAXBUFLEN,0,(struct sockaddr *)&their_addr,&addr_len)) == -1) | |
| { | |
| perror("recvfrom"); | |
| exit(1); | |
| } | |
| printf("got packet from%s\n",inet_ntoa(their_addr.sin_addr)); | |
| printf("packet is %d bytes long\n",numbytes); | |
| buf[numbytes] = '\0'; | |
| printf("packet contains \"%s\"\n",buf); | |
| close(sockfd); | |
| } |
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