-/* dgramrcv.c - receive from udp server
- *
- * author: hackbard
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-/* memset */
-#include <string.h>
-
-/* socket and bind stuff */
-#include <sys/types.h>
-#include <sys/socket.h>
-
-/* sockkaddr_in */
-#include <netinet/in.h>
-
-/* inet_ntoa ... */
-#include <arpa/inet.h>
-
-/* errno stuff ... */
-#include <errno.h>
-
-/* read, close */
-#include <unistd.h>
-
-#define MAX_BUF 1472
-
-int main(int argc, char *argv[]) {
- int receive_fd;
- int opt;
- struct sockaddr_in local_addr,target_addr;
- int receive_bytes, write_bytes;
- socklen_t target_addr_len;
- unsigned char buf[MAX_BUF];
-
- if(argc!=2) {
- printf("usage: %s <port>\n",argv[0]);
- exit(1);
- }
-
- if((receive_fd=socket(AF_INET,SOCK_DGRAM,0)) == -1) {
- printf("can't open socket.\n");
- exit(1);
- }
-
- opt=1;
- setsockopt(receive_fd,SOL_SOCKET,SO_BROADCAST,&opt,sizeof(opt));
-
- local_addr.sin_family=AF_INET;
- local_addr.sin_port=htons(atoi(argv[1]));
- local_addr.sin_addr.s_addr=htonl(INADDR_ANY);
- bind(receive_fd,(const struct sockaddr *)&local_addr,sizeof(local_addr));
-
- memset(&target_addr,0,sizeof(target_addr));
- /*
- target_addr.sin_family=AF_INET;
- target_addr.sin_port=htons(atoi(argv[1]));
- target_addr.sin_addr.s_addr=inet_addr(argv[1]);
- target_addr_len=sizeof(target_addr);
- */
-
- receive_bytes=1;
- while(receive_bytes>0) {
- receive_bytes=recvfrom(receive_fd,buf,sizeof(buf),0,(struct sockaddr *)&target_addr,&target_addr_len);
- write_bytes=write(1,buf,receive_bytes);
- }
-
- close(receive_fd);
- printf("connection closed ...\n");
- printf("%d from %d total bytes written.\n",write_bytes,receive_bytes);
-
- return 0;
-}