/* invoked within arp_act() when an ARP reply message comes, or within
* arp_respond() when an ARP inquiry message comes. They both running in a
* bottom half, so arp_learn() is never re-entered.
*
*/
static struct arp_record * arp_learn(u8 *comer_mac, u32 comer_ip){
int index = iphash(comer_ip )% ARP_TBL_LEN;
struct arp_record *record = arptbl[index];
while(record){
if( record->his_ip == comer_ip) break;
record = record->next;
}
/* ok, this ARP message comes from a known host, try update */
if(record){
memcpy( record->his_mac, comer_mac, 6);
}
else{ /* a new IP, we will learn it */
record = kmalloc2( sizeof( struct arp_record), 0 );
record->his_ip = comer_ip;
memcpy( record->his_mac, comer_mac, 6);
LL_I( arptbl[index], record);
//oprintf("ARP Learn:" );
//print_mac(comer_mac);
//oprintf("<==");
//print_ip(comer_ip);
//oprintf("\n");
}
return record;
}
/* @DESC
* Now, an IP datagram wanna go out. We let arp layer determine it's next hop,
* to a gateway, or directly to another host in LAN.
*/
void arp_down(struct sk_buff *skb){
struct iphdr * iphdr = skb->iphdr;
unsigned yourip = ntohl(iphdr->yourip);
//unsigned myip = ntohl(iphdr->myip);
struct net_device * dev = skb->dev;
assert(dev);
memcpy(skb->ethhdr->mymac, skb->dev->mac, 6);
skb->ethhdr->protocol = htons(0x0800);
//skb_cursor_up(skb, sizeof(struct ethhdr));
unsigned nexthop;
if((yourip & dev->ipmask) == (dev->ip & dev->ipmask)){
nexthop = yourip;
}
else nexthop = dev->gateway_ip;
u8 *dest_mac = arp_lookup(nexthop);
if(dest_mac){
memcpy(skb->ethhdr->yourmac, dest_mac, 6);
waiting_for_transmit(skb);
}
else{
oprintf("[!]\n");
cli();
int index = iphash(yourip )% ARP_TBL_LEN;
//oprintf("hash ip:%s, got index:%u", mk_ipstr(yourip), index);
LL_I( later_down[index], skb);
sti();
arp_inquire(yourip);
}
}
static u8 *arp_lookup(u32 ip){
int index = iphash(ip) % ARP_TBL_LEN;
struct arp_record * root = arptbl[index];
struct arp_record *it = 0;
LL_SCAN_ON_KEY(root, his_ip, ip, it);
if(it){
return (u8*)it->his_mac;
}
return 0;
}
/* when we receive an ARP reply on operation 1 */
static void arp_act(struct sk_buff *skb){
struct arphdr *arphdr = skb->arphdr;
assert(arphdr->operation == 2 &&
arphdr->yourmac[3] == skb->dev->mac[3]);
struct arp_record * record = arp_learn( arphdr->mymac ,arphdr->myip);
int index = iphash(record->his_ip )% ARP_TBL_LEN;
struct sk_buff * waiting = later_down[index];
//oprintf("laterdown try waked!target ip:%s, got index:%u\n", mk_ipstr(record->his_ip), index);
while(waiting){
oprintf("$");
struct sk_buff *_next = waiting->next;
if(waiting->iphdr->yourip == htonl(record->his_ip)){
//oprintf("find one in later_down\n");
memcpy(waiting->ethhdr->yourmac, record->his_mac, 6);
cli();
LL_DEL(later_down[index], waiting);
sti(); //BUG
waiting_for_transmit(waiting);
}
waiting = _next;
}
}
char *
wwwlogin(struct userec *user, int ipmask)
{
FILE *fp, *fp1;
int n, dolog = 0, st, clubnum, uid, i, nsearch;
struct user_info *u;
char ULIST[STRLEN];
char genbuf[256], *urlbase, fname[80];
uid = getusernum(user->userid) + 1;
if ((urlbase = check_multi(user->userid, uid)))
return urlbase;
if (strcasecmp(user->userid, "guest") && count_uindex(uid) >= 3)
http_fatal("您已经登录了三个帐号,不能再登录了");
// 如果要限制WWW登录窗口数 就打开这个注释. lepton
gethostname(genbuf, 256);
sprintf(ULIST, MY_BBS_HOME "/%s.%s", ULIST_BASE, genbuf);
fp = fopen(ULIST, "a");
flock(fileno(fp), LOCK_EX);
nsearch = NSEARCH;
//if (strcasecmp(user->userid, "guest"))
// nsearch = MAXACTIVE / 4;
for (i = 0, n = iphash(fromhost) * (MAXACTIVE / NHASH); i < nsearch;
i++, n++) {
if (n >= MAXACTIVE)
n = 0;
u = &(shm_utmp->uinfo[n]);
if (u->active && u->pid == 1
&& ((now_t - u->lasttime) > 20 * 60 || u->wwwinfo.iskicked)) {
st = u->lasttime - u->wwwinfo.login_start_time;
if (st > 86400) {
errlog("Strange long stay time,%d!, drop %s",
st, u->userid);
st = 86400;
}
sprintf(genbuf, "%s drop %d www", u->userid, st);
newtrace(genbuf);
remove_uindex(u->uid, n + 1);
bzero(u, sizeof (struct user_info));
}
if (!dolog && u->active == 0) {
u_info = u;
bzero(u, sizeof (struct user_info));
u->active = 1;
u->uid = uid;
u->pid = 1;
//u->pid = thispid; //modify by mintbaggio@BMY for kill www user
u->mode = LOGIN;
if (strcasecmp(user->userid, "guest"))
u_info->unreadmsg = get_unreadmsg(user->userid);
else
u_info->unreadmsg = 0;
u->userlevel = user->userlevel;
u->lasttime = now_t;
u->curboard = 0;
if (user_perm(user, PERM_LOGINCLOAK) &&
(user->flags[0] & CLOAK_FLAG))
u->invisible = YEA;
u->pager = 0;
if (user->userdefine & DEF_FRIENDCALL)
u->pager |= FRIEND_PAGER;
if (user->flags[0] & PAGER_FLAG) {
u->pager |= ALL_PAGER;
u->pager |= FRIEND_PAGER;
}
if (user->userdefine & DEF_FRIENDMSG)
u->pager |= FRIENDMSG_PAGER;
if (user->userdefine & DEF_ALLMSG) {
u->pager |= ALLMSG_PAGER;
u->pager |= FRIENDMSG_PAGER;
}
strsncpy(u->from, fromhost, 24);
strsncpy(u->username, user->username, NAMELEN);
strsncpy(u->userid, user->userid, IDLEN + 1);
getrandomstr(u->sessionid);
if (strcasecmp(user->userid, "guest"))
initfriends(u);
else
memset(u->friend, 0, sizeof (u->friend));
urlbase = makeurlbase(n);
w_info = &(u_info->wwwinfo);
w_info->login_start_time = now_t;
w_info->ipmask = ipmask;
if (strcasecmp(user->userid, "guest")) {
sethomefile(fname, user->userid, "clubrights");
if ((fp1 = fopen(fname, "r")) == NULL) {
memset(u_info->clubrights, 0,
4 * sizeof (int));
} else {
while (fgets(genbuf, STRLEN, fp1) !=
NULL) {
clubnum = atoi(genbuf);
u_info->clubrights[clubnum /
32] |=
(1 << clubnum % 32);
}
fclose(fp1);
}
set_my_cookie();
} else {
memset(u_info->clubrights, 0, 4 * sizeof (int));
w_info->t_lines = 20;
w_info->att_mode = 0;
w_info->doc_mode = 1;
}
dolog = 1;
add_uindex(u->uid, n + 1);
}
}
