static OM_uint32 inquire_cred
(OM_uint32 *minor_status,
gss_opaque_t cred_handle,
gss_name_t *name,
OM_uint32 *lifetime,
int *cred_usage
)
{
OM_uint32 major, minor;
nil_cred *cred;
if ((major = check_cred(&minor, cred_handle)) != GSS_S_COMPLETE)
return major;
cred = (nil_cred *) cred_handle;
if (name != NULL)
{
if ((*name = ilugss_copy_name(cred->name)) == NULL)
return GSS_S_FAILURE;
}
if (lifetime != NULL)
{
if (cred->endtime != GSS_C_INDEFINITE)
*lifetime = cred->endtime - time(NULL);
else
*lifetime = GSS_C_INDEFINITE;
}
if (cred_usage != NULL)
*cred_usage = cred->usage;
return GSS_S_COMPLETE;
}
void handle_client( void* addrnew_client)
{
/* Handles each new client request */
int new_client=(int)addrnew_client;
char *buf=(char*)malloc(sizeof(char)*255);
int n;
/* First we send a welcome message of the server, just for information */
Serv_Msg *s_m = (Serv_Msg *)malloc(sizeof(Serv_Msg));
Cred cr;
Cred *cr1, *cr_recv;
Cl_Msg *c_m = (Cl_Msg *)malloc(sizeof(Cl_Msg));
ChatRoom *chat_room;
strcpy(s_m->wm, "Welcome to AASVAR Chat Server! Enjoy\nIdentify yourself to the server.");
send(new_client, s_m, sizeof(Serv_Msg), 0);
while(1){
if( (n= recv( new_client, c_m, sizeof(Cl_Msg), 0)) !=-1 && n !=0)
{
cr = find_cr_by_client_id(bl, new_client);
switch(c_m->type){
/* Logon process */
/* Existing user */
case EXIST_USER:
if(is_exist_buddy(bl, c_m->cr) && !is_signed_in(bl, c_m->cr) && check_cred(bl, c_m->cr)){
sign_on_buddy(bl, c_m->cr, new_client);
strcpy(s_m->m, c_m->cr.u_name);
s_m->l_r = OLD_SIGNED_IN;
}
else if(is_exist_buddy(bl, c_m->cr)){
s_m->l_r = SIGNED_IN_OR_PASS;
}
else s_m->l_r = DO_NOT_EXIST;
s_m->type = LOGIN_RES;
send(new_client, s_m, sizeof(Serv_Msg), 0);
break;
case NEW_USER:
if(is_exist_buddy(bl, c_m->cr))
s_m->l_r = OLD_EXIST;
else{
add_buddy(bl, c_m->cr, new_client);
sign_on_buddy(bl, c_m->cr, new_client);
strcpy(s_m->m, c_m->cr.u_name);
s_m->l_r = NEW_CREATED;
}
s_m->type = LOGIN_RES;
send(new_client, s_m, sizeof(Serv_Msg), 0);
break;
case GET_BL:
/* Send the current buddy list with all signed on users */
get_buddy_list(bl, s_m);
s_m->type = BL_RES;
send(new_client, s_m, sizeof(Serv_Msg), 0);
break;
case IM_REQ_CL:
/* Tries to generate an IM b/w two connecting entities */
/* Check again if the buddy exist in the queue */
if(is_exist_buddy(bl, c_m->cr)){
s_m->type = IM_REQ_SERV;
cr = find_cr_by_client_id(bl, new_client);
/* Send a packet to the receiver to ack the packet */
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
else printf("Buddy not found!");
break;
case IM_ACK_CL:
break;
case CHAT_ROOM_CREAT_REQ_CL:
/* Starts a new chat room */
chat_room = create_chat_room(chat_rooms, cr.u_name);
add_cr_to_chat_room(chat_room, cr);
s_m->type = CHAT_ROOM_CREAT;
sprintf(s_m->m, "Chat room with name %s created!\n", chat_room->name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
break;
case CHAT_ROOM_JOIN_REQ_CL:
/* Search the chat room with the specified name */
chat_room = find_chat_room(chat_rooms, c_m->chat_room_name);
if(chat_room != NULL){
add_cr_to_chat_room(chat_room, cr);
s_m->type = CHAT_ROOM_JOINED;
sprintf(s_m->m, "Chat room %s joined!\n", chat_room->name);
}
else{
s_m->type = ERR;
sprintf(s_m->m, "No chat room with name %s found!\n", c_m->chat_room_name);
}
send(new_client, s_m, sizeof(Serv_Msg), 0);
break;
case CHAT_ROOM_SEND_MSG:
/* Sends a message to all clients in the chat room */
if((chat_room =find_chat_room(chat_rooms, c_m->chat_room_name))!=NULL&& is_user_added_chat_room(chat_room, cr))
broadcast_chat_msg(chat_room, c_m->cm, cr);
else if(chat_room == NULL){
s_m->type = ERR;
sprintf(s_m->m, "No chat room with name %s found!\n", c_m->chat_room_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
else{
s_m->type = ERR;
sprintf(s_m->m, "You are not added!\n", c_m->chat_room_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
break;
case IM_START_REQ:
/* Asks the other client if it is okay to start IM */
cr1 = find_cr_by_name(bl, c_m->im.cr.u_name);
if(cr1){
s_m->type = IM_START_CONF;
s_m->im.cr = find_cr_by_client_id(bl, new_client);
send(cr1->socket_id, s_m, sizeof(Serv_Msg), 0);
}
else{
s_m->type = ERR;
sprintf(s_m->m, "The user %s does not exist!\n", c_m->im.cr.u_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
break;
case SIGN_OUT_CL:
/* Locate the user */
cr = find_cr_by_client_id(bl, new_client);
sign_out_buddy(bl, cr);
s_m->type = SIGN_OUT_CONF;
sprintf(s_m->m, "You have been successfully signed out!\n");
send(new_client, s_m, sizeof(Serv_Msg), 0);
break;
case IM_SEND:
/* Locate the user requested */
cr = find_cr_by_client_id(bl, new_client);
cr_recv = find_cr_by_name(bl,c_m->im.cr.u_name);
if(!cr_recv){
/* User not found! */
s_m->type = ERR;
sprintf(s_m->m, "The user %s does not exist\n", c_m->im.cr.u_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
else if(!is_signed_in(bl, *cr_recv)){
s_m->type = ERR;
sprintf(s_m->m, "The user %s is offline!\n", c_m->im.cr.u_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
else{
s_m->im = c_m->im;
s_m->im.cr = cr;
s_m->type = IM_RECV;
send(cr_recv->socket_id, s_m, sizeof(Serv_Msg), 0);
}
break;
case FILE_XFER_SEND:
/* Locate the user requested */
cr_recv = find_cr_by_name(bl,c_m->cr.u_name);
if(!cr_recv){
/* User not found! */
s_m->type = ERR;
sprintf(s_m->m, "The user %s does not exist\n", c_m->im.cr.u_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
else if(!is_signed_in(bl, *cr_recv)){
s_m->type = ERR;
sprintf(s_m->m, "The user %s is offline!\n", c_m->im.cr.u_name);
send(new_client, s_m, sizeof(Serv_Msg), 0);
}
else{
s_m->fx = c_m->fx;
s_m->type = FILE_XFER_RECV;
send(cr_recv->socket_id, s_m, sizeof(Serv_Msg), 0);
}
break;
}
}
else if (n == 0){
cr = find_cr_by_client_id(bl, new_client);
printf("Client %s has quit: removing from list\n", cr.u_name);
sign_out_buddy(bl, cr);
s_m->type = SIGN_OUT_CONF;
return;
}
else
{ perror("cant get message, exiting\n");
exit(1);
}
}
}
static int dummy_portmap(int sock, FILE *portmap_file)
{
struct sockaddr_in sin;
int pktlen, addrlen;
unsigned char pkt[65536]; /* Max UDP packet size */
/* RPC UDP packets do not include TCP fragment size */
struct rpc_call *rpc = (struct rpc_call *) &pkt[-4];
struct rpc_auth *cred;
struct rpc_auth *vrf;
struct portmap_args *args;
struct portmap_reply rply;
for (;;) {
addrlen = sizeof sin;
pktlen = recvfrom(sock, &pkt, sizeof pkt, 0,
(struct sockaddr *)&sin, &addrlen);
if (pktlen < 0) {
if (errno == EINTR)
continue;
return -1;
}
/* +4 to skip the TCP fragment header */
if (pktlen + 4 < sizeof(struct portmap_call))
continue; /* Bad packet */
if (rpc->hdr.udp.msg_type != htonl(RPC_CALL))
continue; /* Bad packet */
memset(&rply, 0, sizeof rply);
rply.rpc.hdr.udp.xid = rpc->hdr.udp.xid;
rply.rpc.hdr.udp.msg_type = htonl(RPC_REPLY);
cred = (struct rpc_auth *) &rpc->cred_flavor;
if (rpc->rpc_vers != htonl(2)) {
rply.rpc.reply_state = htonl(REPLY_DENIED);
/* state <- RPC_MISMATCH == 0 */
} else if (rpc->program != htonl(PORTMAP_PROGRAM)) {
rply.rpc.reply_state = htonl(PROG_UNAVAIL);
} else if (rpc->prog_vers != htonl(2)) {
rply.rpc.reply_state = htonl(PROG_MISMATCH);
} else if (!(vrf = get_auth(cred)) ||
(char *)vrf > (char *)pkt + pktlen - 8 - sizeof(*args) ||
!(args = get_auth(vrf)) ||
(char *)args > (char *)pkt + pktlen - sizeof(*args) ||
check_cred(cred) || check_vrf(vrf)) {
/* Can't deal with credentials data; the kernel
won't send them */
rply.rpc.reply_state = htonl(SYSTEM_ERR);
} else {
switch (ntohl(rpc->proc)) {
case PMAP_PROC_NULL:
break;
case PMAP_PROC_SET:
if (args->proto == htonl(IPPROTO_TCP) ||
args->proto == htonl(IPPROTO_UDP)) {
if (portmap_file)
fprintf(portmap_file,
"%u %u %s %u\n",
ntohl(args->program),
ntohl(args->version),
protoname(args->proto),
ntohl(args->port));
rply.port = htonl(1); /* TRUE = success */
}
break;
case PMAP_PROC_UNSET:
rply.port = htonl(1); /* TRUE = success */
break;
case PMAP_PROC_GETPORT:
break;
case PMAP_PROC_DUMP:
break;
default:
rply.rpc.reply_state = htonl(PROC_UNAVAIL);
break;
}
}
sendto(sock, &rply.rpc.hdr.udp, sizeof rply - 4, 0,
(struct sockaddr *)&sin, addrlen);
}
}
