int main(int argc,char *argv[])
{
int sockfd;
const int on = 1;
pid_t pid;
struct sockaddr_in *sa,cliaddr,wildaddr;
struct ifi_info *ifi,*ifihead;
for(ifi = ifihead = get_ifi_info(AF_INET,1);ifi != NULL;
ifi=ifi->ifi_next){
sa = (struct sockaddr_in*)ifi->ifi_addr;
sa->sin_port = htons(SERV_PORT);
sa->sin_family = AF_INET;
sockfd = Socket(AF_INET,SOCK_DGRAM,0);
setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));
Bind(sockfd,(SA*)sa,sizeof(*sa));
if((pid = fork()) == 0){
mydg_echo(sockfd,*cliaddr,sizeof(cliaddr),(SA*)sa);
exit(0);
}
if(ifi->ifi_flags & IFF_BROADCAST){
sockfd = Socket(AF_INET,SOCK_DAGRAM,0);
setsockopt(sockfd,SOL_SOCKET,SOCK_DGRAM,&on,sizeof(on));
sa = (struct sockaddr_in *)ifi->ifi_brdaddr;
sa ->sin_port = htons(SERV_PORT);
sa->sin_family = AF_INET;
if(Bind(sockfd,sa,sizeof(*sa)) < 0){
if(errno == EINUSEADDR){
err_quit("EINUSERADDR:for %s\n",Sock_ntop(sa,sizeof(*sa));
}else{
err_quit("error bind for %s\n",Sock_ntop(sa,sizeof(*sa)));
}
}
int main(int argc, char** argv)
{
int sockfd, family, port;
const int on = 1;
pid_t pid;
socklen_t salen;
struct sockaddr *sa, *wild;
struct ifi_info *ifi, *ifihead;
if (argc == 2)
sockfd = Udp_client(NULL, argv[1], (void**)&sa, &salen);
else if (argc == 3)
sockfd = Udp_client(argv[1], argv[2], (void**)&sa, &salen);
else
err_quit("usage: udpserv04 [ <host> ] <service or port>");
family = sa->sa_family;
port = sock_get_port(sa, salen);
Close(sockfd); /* we just want family, port, salen */
for (ifihead = ifi = Get_ifi_info(family, 1); ifi != NULL;
ifi = ifi->ifi_next) {
/*4bind unicast address */
sockfd = Socket(family, SOCK_DGRAM, 0);
Setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
sock_set_port(ifi->ifi_addr, salen, port);
Bind(sockfd, ifi->ifi_addr, salen);
printf("bound %s\n", Sock_ntop(ifi->ifi_addr, salen));
if ((pid = Fork()) == 0) { /* child */
mydg_echo(sockfd, ifi->ifi_addr, salen);
exit(0); /* never executed */
}
if (ifi->ifi_flags & IFF_BROADCAST) {
/* 4try to bind broadcast address */
sockfd = Socket(family, SOCK_DGRAM, 0);
Setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
sock_set_port(ifi->ifi_brdaddr, salen, port);
if (bind(sockfd, ifi->ifi_brdaddr, salen) < 0) {
if (errno == EADDRINUSE) {
printf("EADDRINUSE: %s\n",
Sock_ntop(ifi->ifi_brdaddr, salen));
Close(sockfd);
continue;
} else
err_sys("bind error for %s",
Sock_ntop(ifi->ifi_brdaddr, salen));
}
printf("bound %s\n", Sock_ntop(ifi->ifi_brdaddr, salen));
if ((pid = Fork()) == 0) { /* child */
mydg_echo(sockfd, ifi->ifi_brdaddr, salen);
exit(0); /* never executed */
}
}
}
/* 4bind wildcard address */
sockfd = Socket(family, SOCK_DGRAM, 0);
Setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
wild = Malloc(salen);
memcpy(wild, sa, salen); /* copy family and port */
sock_set_wild(wild, salen);
Bind(sockfd, wild, salen);
printf("bound %s\n", Sock_ntop(wild, salen));
if ((pid = Fork()) == 0) { /* child */
mydg_echo(sockfd, wild, salen);
exit(0); /* never executed */
}
exit(0);
}
int main(int argc, char **argv)
{
int sockfd[10], sockcount = 0, countline = 0, n = 0, s, nready, maxfdp1, i;
fd_set rset, allset;
socklen_t len, slen;
const int on = 1;
pid_t pid;
struct ifi_info *ifi, *ifihead;
struct sockaddr_in *sa, cliaddr, wildaddr, ss,childservaddr;
char dataline[MAXLINE], mesg[MAXLINE], IPClient[MAXLINE],IPServer[MAXLINE];
config configdata[2];
char *mode = "r";
socket_info sockinfo[10];
FILE *ifp;
int is_local = 0;
ifp = fopen( "server.in", mode );
if ( ifp == NULL )
{
fprintf( stderr, "Can't open input file server.in!\n" );
exit(1);
}
printf("***********************************************************************************\n");
printf("SERVER \n");
printf("***********************************************************************************\n");
while ( fgets( dataline,MAXLINE,ifp ) != NULL )
{
n = strlen( dataline );
strcpy( configdata[countline].data, dataline );
s = strlen( configdata[ countline ].data );
if ( s > 0 && configdata[ countline ].data[ s-1 ] == '\n' ) /* if there's a newline */
{
configdata[countline].data[s-1] = '\0'; /* truncate the string */
}
dataline[n] = 0;
countline++;
}
fclose( ifp );
printf("Creating the send window array dynamically for input window size..\n\n");
sender_window_size = (int) atoi( configdata[1].data );
swnd = (struct msghdr *) malloc( sender_window_size*sizeof( struct msghdr ) );
for ( ifihead = ifi = get_ifi_info_plus( AF_INET, 1 );
ifi != NULL;
ifi = ifi->ifi_next)
{
sockfd[sockcount]=-1;
printf("Total sockets bound : %d\n",sockcount);
int x = 0; /*4bind unicast address */
if( ( sockfd[ sockcount ] = socket( AF_INET, SOCK_DGRAM, 0 ) ) == NULL )
{
printf( "socket error\n" );
exit(1);
} setsockopt( sockfd[sockcount], SOL_SOCKET, SO_REUSEADDR, &on, sizeof( on ) );
sa = ( struct sockaddr_in * )ifi->ifi_addr;
sa->sin_family = AF_INET;
sa->sin_port = htonl( ((int) atoi( configdata[0].data) ));
// sa->sin_port = htonl( 12345 );
bind( sockfd[sockcount], (SA *) sa, sizeof( struct sockaddr_in ) );
slen = sizeof( ss );
if( getsockname( sockfd[sockcount], (SA *)&ss, &slen ) < 0 )
{
printf( "sockname error\n" );
exit(1);
}
printf("\nBOUND SOCKET ADDRESSES : %s\n", inet_ntop( AF_INET, &(ss.sin_addr), IPClient, MAXLINE ));
printf( "SERVER PORT: %d\n", ss.sin_port );
sockinfo[ sockcount ].sockfd = sockfd[ sockcount ];
sockinfo[ sockcount ].ip_addr = (SA *)sa;
sockinfo[ sockcount ].ntmaddr = (struct sockaddr_in *)ifi->ifi_ntmaddr;
//sockinfo[sockcount].subnetaddr=ifi->sockfd[sockcount];
printf( "\nSocket File Descriptor : %d\n", sockinfo[ sockcount ].sockfd );
printf( "IP addr: %s\n",
sock_ntop_host( (SA *)sockinfo[sockcount].ip_addr, sizeof( *sockinfo[sockcount].ip_addr ) ) );
printf( "Network Mask : %s\n",
sock_ntop_host( (SA *)sockinfo[sockcount].ntmaddr, sizeof(*sockinfo[sockcount].ntmaddr ) ) );
sockcount++;
// if ( (pid = fork()) == 0) { /* child */
// mydg_echo(sockfd, (SA *) &cliaddr, sizeof(cliaddr), (SA *) sa);
// exit(0); /* never executed */
// }
/* end udpserv1 */
}
maxfdp1 = -1;
FD_ZERO( &allset );
for( i = 0; i<sockcount; i++ )
{
FD_SET( sockinfo[ i ].sockfd, &allset );
if( sockinfo[ i ].sockfd > maxfdp1 )
{
maxfdp1 = sockinfo[ i ].sockfd;
}
}
for ( ; ; )
{
rset = allset;
if ( ( nready = select( maxfdp1 + 1, &rset, NULL, NULL, NULL ) ) < 0 )
{
if ( errno == EINTR )
continue; /* back to for() */
else
err_sys("select error");
}
for( i = 0; i<sockcount; i++ )
{
if( FD_ISSET( sockinfo[ i ].sockfd, &rset ) )
{
len = sizeof( cliaddr );
char hsMsg[PACKET_SIZE];
char recvBufStr[PACKET_SIZE];
n = recvfrom( sockinfo[ i ].sockfd, hsMsg, PACKET_SIZE, 0, (SA *) &cliaddr, &len );
printf("\nMESSAGE RECIEVED FROM CLIENT : %s\n", hsMsg );
sscanf(hsMsg,"%s %s",mesg,recvBufStr);
recv_window_size=atoi(recvBufStr);
inet_ntop( AF_INET, &cliaddr.sin_addr, IPClient, MAXLINE );
printf("CLIENT ADDRESS : %s\n\n",IPClient );
/* Returns which interface onto which the client has connected. */
if( getsockname( sockinfo[ i ].sockfd, (SA *)&ss, &slen ) < 0 )
{
printf( "sockname error\n" );
exit(1);
}
printf("\nCONNECTION RECEIVED ON :\n ");
printf("BOUND SOCKET ADDRESS : %s\n", inet_ntop( AF_INET, &(ss.sin_addr), IPServer, MAXLINE ));
printf( "SERVER PORT: %d\n", ss.sin_port );
// printf( "sockfd----- %d\n", sockinfo[ i ].sockfd );
printf("\nChecking if Server is LOCAL to client..\n");
if( strcmp( IPServer, "127.0.0.1\n" ) == 0 )
{
printf("STATUS : SAME HOST\nCLIENT ADDRESS : %s\nSERVER ADDRESS : %s\n", IPClient, IPServer );
is_local = 1;
}
else
{
struct in_addr ip, netmask, subnet, clientip, default_ip;
struct in_addr longest_prefix_ip, longest_prefix_netmask;
char network1[MAXLINE], network2[MAXLINE], ip1[MAXLINE], nm1[MAXLINE];
struct sockaddr_in *sd = (struct sockaddr_in *)(sockinfo[ i ].ip_addr);
struct sockaddr_in *se = (struct sockaddr_in *)(sockinfo[ i ].ntmaddr);
ip = sd->sin_addr;
netmask = se->sin_addr;
subnet.s_addr = ip.s_addr & netmask.s_addr;
inet_ntop( AF_INET, &subnet, network1, MAXLINE );
inet_ntop( AF_INET, &ip, ip1, MAXLINE );
inet_ntop( AF_INET, &netmask, nm1, MAXLINE );
inet_pton( AF_INET, IPClient, &clientip );
subnet.s_addr = clientip.s_addr & netmask.s_addr;
inet_ntop( AF_INET, &subnet, network2, MAXLINE );
if( strcmp( network1, network2 ) == 0 )
{
/* LOCAL */
printf("STATUS : LOCAL\nCLIENT ADDRESS (IPClient) : %s\nSERVER ADDRESS (IPServer) : %s\n", IPClient, IPServer );
is_local = 1;
}
else
{
printf("STATUS : NOT LOCAL\nCLIENT ADDRESS : %s\nSERVER ADDRESS : %s\n", IPClient, IPServer );
is_local = 0;
}
}
/* Filling up the child server address structure. */
childservaddr.sin_family = AF_INET;
childservaddr.sin_port = htonl( 0 );
inet_pton( AF_INET, IPServer, &childservaddr.sin_addr );
slen = sizeof( ss );
inet_pton( AF_INET, IPServer, &childservaddr.sin_addr );
if ( ( pid = fork() ) == 0 )
{ /* child */
if( is_local == 1 )
{
setsockopt( sockinfo[ i ].sockfd, SOL_SOCKET, SO_DONTROUTE, &on, sizeof( on ) ) ;
}
mydg_echo( sockinfo[ i ].sockfd, (SA *) &childservaddr, sizeof(childservaddr), (SA *) &cliaddr, sizeof(cliaddr), mesg );
exit(0); /* never executed */
}
}
}
}
exit(0);
}
