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ip/torrent: limit number of connections

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cinap_lenrek 2012-05-06 16:33:17 +02:00
parent 7fff1f8dba
commit 8943c2fb8a
1 changed files with 48 additions and 18 deletions
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66
sys/src/cmd/ip/torrent.c
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@ -44,6 +44,8 @@ struct Stats
enum {
MAXIO = 16*1024,
SRVPROCS = 16,
CLIPROCS = 16,
};
int debug;
@ -579,10 +581,11 @@ void
server(void)
{
char addr[64], adir[40], ldir[40];
int afd, lfd, dfd;
int afd, lfd, dfd, pid, nprocs;
NetConnInfo *ni;
afd = -1;
nprocs = 0;
for(port=6881; port<6890; port++){
snprint(addr, sizeof(addr), "tcp!*!%d", port);
if((afd = announce(addr, adir)) >= 0)
@ -599,7 +602,13 @@ server(void)
fprint(2, "listen: %r");
break;
}
if(rfork(RFFDG|RFPROC|RFMEM)){
while(nprocs >= SRVPROCS)
if(waitpid() > 0)
nprocs--;
nprocs++;
if(pid = rfork(RFFDG|RFPROC|RFMEM)){
if(pid < 0)
nprocs--;
close(lfd);
continue;
}
@ -610,16 +619,16 @@ server(void)
ni = getnetconninfo(ldir, dfd);
peer(dfd, 1, ni ? ni->raddr : "???");
if(ni) freenetconninfo(ni);
break;
exits(0);
}
exits(0);
}
void
client(char *ip, char *port)
{
static Dict *peers;
static Dict *peers, *peerqh, *peerqt;
static QLock peerslk;
static int nprocs;
int try, fd;
char *addr;
Dict *d;
@ -630,7 +639,7 @@ client(char *ip, char *port)
d = mallocz(sizeof(*d) + 64, 1);
snprint(addr = d->str, 64, "tcp!%s!%s", ip, port);
qlock(&peerslk);
if(dlook(peers, addr)){
if(dlook(peers, addr) || dlook(peerqh, addr)){
qunlock(&peerslk);
free(d);
return;
@ -638,23 +647,44 @@ client(char *ip, char *port)
d->len = strlen(addr);
d->typ = 'd';
d->val = d;
d->next = peers;
peers = d;
d->next = nil;
if(peerqt == nil)
peerqh = d;
else
peerqt->next = d;
peerqt = d;
if(nprocs >= CLIPROCS){
qunlock(&peerslk);
return;
}
nprocs++;
qunlock(&peerslk);
if(debug) fprint(2, "client %s\n", addr);
if(rfork(RFFDG|RFPROC|RFMEM))
if(rfork(RFFDG|RFPROC|RFMEM|RFNOWAIT))
return;
for(try = 0; try < 10; try++){
if((fd = dial(addr, nil, nil, nil)) >= 0){
if(!peer(fd, 0, addr))
break;
close(fd);
for(;;){
qlock(&peerslk);
if(d = peerqh){
if((peerqh = d->next) == nil)
peerqt = nil;
d->next = peers;
peers = d;
} else
nprocs--;
qunlock(&peerslk);
if(d == nil)
exits(0);
addr = d->str;
if(debug) fprint(2, "client %s\n", addr);
for(try = 0; try < 5; try++){
if((fd = dial(addr, nil, nil, nil)) >= 0){
if(!peer(fd, 0, addr))
break;
close(fd);
}
sleep((1000<<try)+nrand(5000));
}
sleep((1000<<try)+nrand(5000));
}
exits(0);
}
int