mdw@git.distorted.org.uk Git - qmail/blob - tcpto.c

   1 #include "tcpto.h"
   2 #include "open.h"
   3 #include "lock.h"
   4 #include "seek.h"
   5 #include "now.h"
   6 #include "ip.h"
   7 #include "byte.h"
   8 #include "datetime.h"
   9 #include "readwrite.h"
  10
  11 char tcpto_buf[1024];
  12
  13 static int flagwasthere;
  14 static int fdlock;
  15
  16 static int getbuf()
  17 {
  18  int r;
  19  int fd;
  20
  21  fdlock = open_write("queue/lock/tcpto");
  22  if (fdlock == -1) return 0;
  23  fd = open_read("queue/lock/tcpto");
  24  if (fd == -1) { close(fdlock); return 0; }
  25  if (lock_ex(fdlock) == -1) { close(fdlock); close(fd); return 0; }
  26  r = read(fd,tcpto_buf,sizeof(tcpto_buf));
  27  close(fd);
  28  if (r < 0) { close(fdlock); return 0; }
  29  r >>= 4;
  30  if (!r) close(fdlock);
  31  return r;
  32 }
  33
  34 int tcpto(ip) struct ip_address *ip;
  35 {
  36  int n;
  37  int i;
  38  char *record;
  39  datetime_sec when;
  40
  41  flagwasthere = 0;
  42
  43  n = getbuf();
  44  if (!n) return 0;
  45  close(fdlock);
  46
  47  record = tcpto_buf;
  48  for (i = 0;i < n;++i)
  49   {
  50    if (byte_equal(ip->d,4,record))
  51     {
  52      flagwasthere = 1;
  53      if (record[4] >= 2)
  54       {
  55        when = (unsigned long) (unsigned char) record[11];
  56        when = (when << 8) + (unsigned long) (unsigned char) record[10];
  57        when = (when << 8) + (unsigned long) (unsigned char) record[9];
  58        when = (when << 8) + (unsigned long) (unsigned char) record[8];
  59
  60        if (now() - when < ((60 + (getpid() & 31)) << 6))
  61          return 1;
  62       }
  63      return 0;
  64     }
  65    record += 16;
  66   }
  67  return 0;
  68 }
  69
  70 void tcpto_err(ip,flagerr) struct ip_address *ip; int flagerr;
  71 {
  72  int n;
  73  int i;
  74  char *record;
  75  datetime_sec when;
  76  datetime_sec firstwhen;
  77  int firstpos;
  78  datetime_sec lastwhen;
  79
  80  if (!flagerr)
  81    if (!flagwasthere)
  82      return; /* could have been added, but not worth the effort to check */
  83
  84  n = getbuf();
  85  if (!n) return;
  86
  87  record = tcpto_buf;
  88  for (i = 0;i < n;++i)
  89   {
  90    if (byte_equal(ip->d,4,record))
  91     {
  92      if (!flagerr)
  93        record[4] = 0;
  94      else
  95       {
  96        lastwhen = (unsigned long) (unsigned char) record[11];
  97        lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[10];
  98        lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[9];
  99        lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[8];
 100        when = now();
 101
 102        if (record[4] && (when < 120 + lastwhen)) { close(fdlock); return; }
 103
 104        if (++record[4] > 10) record[4] = 10;
 105        record[8] = when; when >>= 8;
 106        record[9] = when; when >>= 8;
 107        record[10] = when; when >>= 8;
 108        record[11] = when;
 109       }
 110      if (seek_set(fdlock,i << 4) == 0)
 111        if (write(fdlock,record,16) < 16)
 112          ; /*XXX*/
 113      close(fdlock);
 114      return;
 115     }
 116    record += 16;
 117   }
 118
 119  if (!flagerr) { close(fdlock); return; }
 120
 121  record = tcpto_buf;
 122  for (i = 0;i < n;++i)
 123   {
 124    if (!record[4]) break;
 125    record += 16;
 126   }
 127
 128  if (i >= n)
 129   {
 130    firstpos = -1;
 131    record = tcpto_buf;
 132    for (i = 0;i < n;++i)
 133     {
 134      when = (unsigned long) (unsigned char) record[11];
 135      when = (when << 8) + (unsigned long) (unsigned char) record[10];
 136      when = (when << 8) + (unsigned long) (unsigned char) record[9];
 137      when = (when << 8) + (unsigned long) (unsigned char) record[8];
 138      when += (record[4] << 10);
 139      if ((firstpos < 0) || (when < firstwhen))
 140       {
 141        firstpos = i;
 142        firstwhen = when;
 143       }
 144      record += 16;
 145     }
 146    i = firstpos;
 147   }
 148
 149  if (i >= 0)
 150   {
 151    record = tcpto_buf + (i << 4);
 152    byte_copy(record,4,ip->d);
 153    when = now();
 154    record[8] = when; when >>= 8;
 155    record[9] = when; when >>= 8;
 156    record[10] = when; when >>= 8;
 157    record[11] = when;
 158    record[4] = 1;
 159    if (seek_set(fdlock,i << 4) == 0)
 160      if (write(fdlock,record,16) < 16)
 161        ; /*XXX*/
 162   }
 163
 164  close(fdlock);
 165 }