HI,
The following broadcast client code fails and I need your help to fix this issue. It fails in sendto with errno set to 101(Network Unreachable).
Herewith attached the code and ifconfig of my system.
#ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:FB
4:32
inet addr:192.168.108.221 Bcast:192.168.108.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fefb:d432/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:510744 errors:0 dropped:0 overruns:0 frame:0
TX packets:441083 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:77840573 (74.2 MiB) TX bytes:81657829 (77.8 MiB)
Interrupt:185 Base address:0x1400
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1957 errors:0 dropped:0 overruns:0 frame:0
TX packets:1957 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2333868 (2.2 MiB) TX bytes:2333868 (2.2 MiB)
#route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.108.0 * 255.255.255.0 U 0 0 0 eth0
int main(int argc, char *argv[])
{
struct sockaddr_in destaddr;
int port = 31000;
char *msg = "TEST_MSG";
int msglen = strlen(msg);
int ret, numbytes;
int sockfd;
int broadcastflag = 1;
/* do getopt and get the value */
destaddr.sin_family = AF_INET;
destaddr.sin_port = htons(port);
destaddr.sin_addr.s_addr = INADDR_BROADCAST;
/* create socket */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
printf("create socket failed\n");
exit(1);
}
/* set sock options */
ret = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &broadcastflag, sizeof(broadcastflag));
if (ret < 0)
{
printf("setsockopt failed\n");
exit(1);
}
/* send the message */
numbytes = sendto(sockfd, msg, msglen, 0, (struct sockaddr *)&destaddr, sizeof(destaddr));
if (numbytes != msglen)
{
printf("sendto failed bytes %d errno: %d\n", numbytes, errno);
exit(1);
}
close(sockfd);
return 0;
}
