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/* udp_i.c -- inject packets into the network for test */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#define BUFSIZE 1024
#define UDP_PORT 10094
int on = 1;
int off = 0;
main(argc, argv)
int argc;
char *argv[];
{
int sock, portno;
char buf[BUFSIZE], *buftext;
struct sockaddr_in to;
struct hostent *hp, *gethostbyname();
int gethostname();
char myhost[65], *the_host;
/* Set defaults */
gethostname(myhost,65);
the_host = myhost;
portno = UDP_PORT;
/* Test arguments */
if(argc>2){
fprintf(stderr,"Usage: %s [<hostname> [<portnumber>]]\n",argv[0]);
exit(1);
}
if(argc>1)the_host = argv[1];
if(argc>2)portno = atoi(argv[2]);
/* Find the host number */
hp = gethostbyname(the_host);
if (hp == 0){
fprintf(stderr,"%s: unknown host\n",argv[1]);
exit(2);
}
/* Create socket */
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock<0) {
perror("opening raw socket");
exit(1);
}
/* if(setsockopt(sock, SOL_SOCKET, SO_DONTROUTE, &on, sizeof on)<0){
perror("setting socket options");
exit(1);
}
*/
bzero((char *)&to, sizeof to);
bcopy(hp->h_addr_list[0], (char *)&to.sin_addr, hp->h_length);
to.sin_family = AF_INET;
to.sin_port = htons(portno);
/* give the user a prompt */
putchar('>');
fflush(stdout);
/* fill in as much of the header as we care about for now */
buf[12] = 44;
buf[13] = 72;
buf[14] = 6;
buf[15] = 134;
buf[16] = 44;
buf[17] = 72;
buf[18] = 6;
buf[19] = 131;
buftext = buf + 40;
/* Loop until we hit EOF */
while(fgets(buftext,BUFSIZE-40,stdin) != NULL){
if (sendto(sock, buf, (strlen(buftext)+40), 0, (struct sockaddr *)&to, sizeof to) < 0) {
perror("writing of udp socket");
close(sock);
exit(4);
}
putchar('>');
fflush(stdout);
}
/* all done, close the socket and exit */
close(sock);
exit(0);
}
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