#include <netinet/in.h> #include <arpa/inet.h> #include <net/if.h> #include <netinet/ip.h> #include <netinet/udp.h> #include <netinet/ether.h> #include <linux/if_packet.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sys/socket.h> //for sockets #include <net/if.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <signal.h> #include <linux/if_ether.h> //for ETH_P_802_2 #include <linux/if_packet.h> //for sockaddr_ll #include <linux/filter.h> #include <sys/types.h> //for sendto #include "stp_bpdu.h" struct bpdu_format { int bridge_id; int port_id; }; int main () { struct bpdu_format bpdu; struct sockaddr_in sin; struct in_addr localInterface; int fd; bpdu.bridge_id=6969; bpdu.port_id=04; fd = socket(PF_PACKET, (int)SOCK_RAW, htons(ETH_P_802_2)); /* open socket */ if(fd==-1) perror("socket failed to open\n"); else printf("socket successfully created\n"); memset((char *) &sin, 0, sizeof(sin)); sin.sin_family = AF_INET; sin.sin_addr.s_addr = inet_addr("239.168.140.22"); localInterface.s_addr = inet_addr("192.168.15.69"); if(setsockopt(fd,SOL_SOCKET, IP_MULTICAST_IF, (char *)&localInterface, sizeof(localInterface)) < 0) { perror("Setting local interface error\n"); exit(1); } else printf("Setting the local interface...OK\n"); if(sendto(fd,(struct bpdu *)&bpdu, sizeof(struct bpdu_format), 0, (struct sockaddr *)&sin, sizeof(sin))<0) { perror("Sending message error"); } else printf("Sending message...OK\n"); close(fd); return 0; } output: socket successfully created.... Setting the local interface...OK Sending message error: Invalid argument please help me in solving this issue
