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tcpto.c
165 lines (145 loc) · 3.53 KB
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tcpto.c
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#include "tcpto.h"
#include "open.h"
#include "lock.h"
#include "seek.h"
#include "now.h"
#include "ip.h"
#include "byte.h"
#include "datetime.h"
#include "readwrite.h"
char tcpto_buf[1024];
static int flagwasthere;
static int fdlock;
static int getbuf()
{
int r;
int fd;
fdlock = open_write("queue/lock/tcpto");
if (fdlock == -1) return 0;
fd = open_read("queue/lock/tcpto");
if (fd == -1) { close(fdlock); return 0; }
if (lock_ex(fdlock) == -1) { close(fdlock); close(fd); return 0; }
r = read(fd,tcpto_buf,sizeof(tcpto_buf));
close(fd);
if (r < 0) { close(fdlock); return 0; }
r >>= 4;
if (!r) close(fdlock);
return r;
}
int tcpto(ip) struct ip_address *ip;
{
int n;
int i;
char *record;
datetime_sec when;
flagwasthere = 0;
n = getbuf();
if (!n) return 0;
close(fdlock);
record = tcpto_buf;
for (i = 0;i < n;++i)
{
if (byte_equal(ip->d,4,record))
{
flagwasthere = 1;
if (record[4] >= 2)
{
when = (unsigned long) (unsigned char) record[11];
when = (when << 8) + (unsigned long) (unsigned char) record[10];
when = (when << 8) + (unsigned long) (unsigned char) record[9];
when = (when << 8) + (unsigned long) (unsigned char) record[8];
if (now() - when < ((60 + (getpid() & 31)) << 6))
return 1;
}
return 0;
}
record += 16;
}
return 0;
}
void tcpto_err(ip,flagerr) struct ip_address *ip; int flagerr;
{
int n;
int i;
char *record;
datetime_sec when;
datetime_sec firstwhen;
int firstpos;
datetime_sec lastwhen;
if (!flagerr)
if (!flagwasthere)
return; /* could have been added, but not worth the effort to check */
n = getbuf();
if (!n) return;
record = tcpto_buf;
for (i = 0;i < n;++i)
{
if (byte_equal(ip->d,4,record))
{
if (!flagerr)
record[4] = 0;
else
{
lastwhen = (unsigned long) (unsigned char) record[11];
lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[10];
lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[9];
lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[8];
when = now();
if (record[4] && (when < 120 + lastwhen)) { close(fdlock); return; }
if (++record[4] > 10) record[4] = 10;
record[8] = when; when >>= 8;
record[9] = when; when >>= 8;
record[10] = when; when >>= 8;
record[11] = when;
}
if (seek_set(fdlock,i << 4) == 0)
if (write(fdlock,record,16) < 16)
; /*XXX*/
close(fdlock);
return;
}
record += 16;
}
if (!flagerr) { close(fdlock); return; }
record = tcpto_buf;
for (i = 0;i < n;++i)
{
if (!record[4]) break;
record += 16;
}
if (i >= n)
{
firstpos = -1;
record = tcpto_buf;
for (i = 0;i < n;++i)
{
when = (unsigned long) (unsigned char) record[11];
when = (when << 8) + (unsigned long) (unsigned char) record[10];
when = (when << 8) + (unsigned long) (unsigned char) record[9];
when = (when << 8) + (unsigned long) (unsigned char) record[8];
when += (record[4] << 10);
if ((firstpos < 0) || (when < firstwhen))
{
firstpos = i;
firstwhen = when;
}
record += 16;
}
i = firstpos;
}
if (i >= 0)
{
record = tcpto_buf + (i << 4);
byte_copy(record,4,ip->d);
when = now();
record[8] = when; when >>= 8;
record[9] = when; when >>= 8;
record[10] = when; when >>= 8;
record[11] = when;
record[4] = 1;
if (seek_set(fdlock,i << 4) == 0)
if (write(fdlock,record,16) < 16)
; /*XXX*/
}
close(fdlock);
}