void say_who_called(struct sockaddr_in* addrp)
{
char host[BUFSIZ];
int port;
get_internet_address(host, BUFSIZ, &port, addrp);
printf ("from: %s: %d\n", host, port);
}
/******************
Main function block
******************/
int main(void) {
printf("Server C is up and running\n\n");
pid_t pid;
int i, j, k, l, yes = 1;
int sockID, newID; //Socket IDs
struct addrinfo hints, *serverInfo, *P;
socklen_t sin_size; //socklen_t is of type unsigned integer of atleast 32 bits;
int rv;
int serverID;
char s[INET6_ADDRSTRLEN];
int buf[8];
int connectivity[4][2];
serverID = 3;
get_neighbor_info(serverID);
printf("\n");
l = 0;
for(j=0; j<4; j++) {
for(k=0; k<2; k++) {
buf[l++] = info[serverID-1][j][k];
}
}
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if ((rv = getaddrinfo("localhost", CLIENT_PORT, &hints, &serverInfo)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return 1;
}
// loop through all the results and connect to the first we can
for(P = serverInfo; P != NULL; P = P->ai_next) {
if ((sockID = socket(P->ai_family, P->ai_socktype, P->ai_protocol)) == -1) {
perror("socket");
continue;
}
if (setsockopt(sockID, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
perror("setsockopt");
exit(1);
}
if (connect(sockID, P->ai_addr, P->ai_addrlen) == -1) {
close(sockID);
perror("connect");
continue;
}
break;
}
if (P == NULL) {
fprintf(stderr, "failed to connect\n");
return 2;
}
//Sending
write(sockID, buf,sizeof(buf));
printf("The Server C finishes sending its neighbor information to the client with TCP port number = %s and IP address = %s\n", CLIENT_PORT, inet_ntop(P->ai_family, get_internet_address((struct sockaddr *)P->ai_addr), s, sizeof s));
struct sockaddr_in sin;
socklen_t len = sizeof(sin);
if (getsockname(sockID, (struct sockaddr *)&sin, &len) == -1)
perror("getsockname");
char hostname[128];
gethostname(hostname, sizeof hostname);
printf("For this connection with the client, the Server C has TCP port number = %d and IP address = %s\n",ntohs(sin.sin_port),s);
freeaddrinfo(serverInfo); // all done with this structure
close(sockID);
printf("\n");
/*-------------------------------------------------------
Shall now receive the network map from the client via UDP
-------------------------------------------------------*/
int num_bytes;
socklen_t address_length;
struct sockaddr_in clientInfo;
address_length = sizeof(clientInfo);
char s_a[INET6_ADDRSTRLEN];
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
memset(&serverInfo, 0, sizeof serverInfo);
if((rv = getaddrinfo(NULL, "23141", &hints, &serverInfo)) != 0) {//if getaddrinfo didn't succeed
fprintf(stderr,"getaddrinfo : %s\n", gai_strerror(rv));
return 1;
}
//If getaddrinfo succeeded, loop through addresses till we can bind to one
for(P=serverInfo; P!=NULL; P->ai_next) {
if((sockID = socket(P->ai_family, P->ai_socktype, P->ai_protocol)) == -1) {
perror("listener: socket");
continue;
}
if(bind(sockID, P->ai_addr, P->ai_addrlen) == -1) {
perror("listener: bind");
continue;
}
break; //Created and bound to socket
}
if(P==NULL) {
fprintf(stderr,"Failed to bind");
return 2;
}
char buf_test[16];
int rxbuf[1024];
freeaddrinfo(serverInfo);
if((num_bytes = recvfrom(sockID, rxbuf, 1024, 0, (struct sockaddr *)&clientInfo, &address_length)) == -1) {
perror("recv");
exit(1);
}
socklen_t UDPlen;
struct sockaddr UDPaddr;
int UDPport;
UDPlen = sizeof(UDPaddr);
getpeername(sockID, (struct sockaddr*)&UDPaddr, &UDPlen);
struct sockaddr_in *s2 = (struct sockaddr_in *)&UDPaddr;
UDPport = ntohs(s2->sin_port);
printf("The server C has received the network topology from the client with UDP port number = %d, and IP address = %s\n",ntohs(clientInfo.sin_port), s);
printf("Edge------------Cost\n");
char Vertex[5] = "ABCD";
int adjacencyMatrix[4][4];
k = 0;
for(i=0; i<4; i++)
for(j=0; j<4; j++)
adjacencyMatrix[i][j] = rxbuf[k++];
for(i=0; i<4; i++) {
for(j=i; j<4; j++) {
if(adjacencyMatrix[i][j]>0) {
printf("%c%c\t\t%d\n",Vertex[i], Vertex[j], adjacencyMatrix[i][j]);
}
}
}
struct sockaddr_in sin3;
socklen_t len3 = sizeof(sin3);
if (getsockname(sockID, (struct sockaddr *)&sin3, &len3) == -1)
perror("getsockname");
printf("For this connection with the client, the Server C has the UDP port number = %d, and IP address = %s\n",ntohs(sin3.sin_port),s);
close(sockID);
return 0;
}
