/* XXX: this program knows quite a bit about tcpto's internals */

#include <sys/socket.h>
#include <unistd.h>

#include "buffer.h"
#include "error.h"
#include "exit.h"
#include "fmt.h"
#include "ip.h"
#include "lock.h"
#include "logmsg.h"
#include "open.h"
#include "stralloc.h"

#include "datetime.h"
#include "now.h"

#ifdef USE_CONFIG
  #include "fehsqm-config.h"
#else
  #include "auto_qmail.h"
#endif

#define WHO "qmail-tcpto"

static void die(int n)
{
  buffer_flush(buffer_1);
  _exit(n);
}

static void warn(char *s)
{
  char *x;
  x = error_str(errno);
  buffer_puts(buffer_1, s);
  buffer_puts(buffer_1, ": ");
  buffer_puts(buffer_1, x);
  buffer_puts(buffer_1, "\n");
}

static void die_chdir()
{
  logmsg(WHO, 110, FATAL, "unable to chdir");
}

static void die_open()
{
  logmsg(WHO, 112, FATAL, "unable to open tcpto");
}

static void die_lock()
{
  logmsg(WHO, 112, FATAL, "unable to lock tcpto");
}

static void die_read()
{
  logmsg(WHO, 112, FATAL, "unable to read tcpto");
}

char tcpto_buf[1024];

char tmp[FMT_ULONG + IPFMT];

int main(void)
{
  int fdlock;
  int fd;
  int r;
  int i;
  char *record;
  char ip4[4];
  char ip6[16];
  datetime_sec when;
  datetime_sec start;

  if (chdir(auto_qmail) == -1) die_chdir();
  if (chdir("queue/lock") == -1) die_chdir();

  fdlock = open_write("tcpto");
  if (fdlock == -1) die_open();
  fd = open_read("tcpto");
  if (fd == -1) die_open();
  if (lock_ex(fdlock) == -1) die_lock();
  r = read(fd, tcpto_buf, sizeof(tcpto_buf));
  close(fd);
  close(fdlock);

  if (r == -1) die_read();
  r >>= 5; /* 32 bit read */

  start = now();
  record = tcpto_buf;

  for (i = 0; i < r; ++i) {
    if (record[4] >= 1) {
      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 (record[0] == AF_INET) {
        byte_copy(&ip4, 4, record + 16);
        buffer_put(buffer_1, tmp, ip4_fmt(tmp, ip4));
      } else {
        byte_copy(&ip6, 16, record + 16);
        buffer_put(buffer_1, tmp, ip6_fmt(tmp, ip6));
      }
      buffer_puts(buffer_1, " timed out ");
      buffer_put(buffer_1, tmp, fmt_ulong(tmp, (unsigned long)(start - when)));
      buffer_puts(buffer_1, " seconds ago; # recent timeouts: ");
      buffer_put(buffer_1, tmp, fmt_ulong(tmp, (unsigned long)(unsigned char)record[4]));
      buffer_puts(buffer_1, "\n");
    }
    record += 32;
  }

  die(0);
}