added datagram.c udp streaming server

diff --git a/datagram.c b/datagram.c
new file mode 100644 (file)
index 0000000..a140c32
--- /dev/null
+++ b/datagram.c
@@ -0,0 +1,75 @@
+/* datagram.c - datagram sockets 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>
+
+int main(int argc, char *argv[]) {
+  int send_fd;
+  struct sockaddr_in local_addr, remote_addr;
+  socklen_t remote_addr_len;
+  int send_bytes;
+
+  if(argc!=3) {
+    printf("usage: %s <target-ip/broadcast-addr> <port>\n",argv[0]);
+    exit(1);
+  }
+
+  if((send_fd=socket(AF_INET,SOCK_DGRAM,0)) == -1) {
+    printf("can't open socket.\n");
+    exit(1);
+  }
+ 
+  memset(&local_addr,0,sizeof(local_addr));
+  local_addr.sin_family=AF_INET;
+  local_addr.sin_port=htons(atoi(argv[2]));
+  local_addr.sin_addr.s_addr=htonl(INADDR_ANY);
+
+  if(bind(send_fd,(struct sockaddr *)&local_addr,sizeof(local_addr))==-1) {
+    printf("unable to bind on port %d.\n",atoi(argv[1]));
+    perror("bind");
+    exit(1);
+  }
+
+  // remote_addr_len=sizeof(remote_addr); 
+  memset(&remote_addr,0,sizeof(remote_addr));
+  remote_addr.sin_family=AF_INET;
+  remote_addr.sin_port=htons(atoi(argv[2]));
+  remote_addr.sin_addr=inet_addr(argv[1]);
+
+  /* send stuff .... */
+  read_bytes=1;
+  while(read_bytes>0) {
+    unsigned char buf[1000];
+    read_bytes=read(0,buf,sizeof(buf));
+    send_bytes=sendto(send_fd,buf,sizeof(buf),&remote_addr,sizeof(remote_addr);
+  }
+
+  close(send_fd);
+  printf("connection closed ...\n");
+  printf("%d from %d total bytes sent.\n",send_bytes,read_bytes);
+
+  return 0;
+}