mailfront new plugin API

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I've pushed out my current code for the next mailfront API to github as
branch "api3".  It incorporate all three suggestions -- plugins can now
handle sender and recipient extra parameters, add capabilities, and add
new commands.  The command API is in a bit of flux -- the current fixed
array of commands doesn't work well when the command is only present in
certain cases.

I've also adapted the mailfront ucspi-tls patch to this new API as
"starttls-ucspi".  It compiles, but I'm having a little trouble getting
an appropriately patched sslserver setup on Gentoo.

Could somebody test this for me?  Just drop the attached file into the
mailfront source directory and type:

	./makeso plugin-starttls-ucspi.c  -lbg -lbg-sysdeps

and add starttls-ucspi to the mailfront command line.

--=20
Bruce Guenter <[email protected]>                http://untroubled.org/

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#include "mailfront.h"
#include <stdlib.h>
#include <unistd.h>

static RESPONSE(unimp, 500, "5.5.1 Not implemented.");
static RESPONSE(start, 220, "2.0.0 Ready to start TLS");

static int tls_available = 0;

static const response* init(void)
{
  tls_available = getenv("UCSPITLS") != 0;
  return 0;
}

static const response* helo(str* hostname, str* capabilities)
{
  if (tls_available)
    if (!str_cats(capabilities, "STARTTLS\n")) return &resp_oom;
  return 0;
  (void)hostname;
}

static int starttls(void)
{
  int fd;
  char *fdstr;

  if (!(fdstr=getenv("SSLCTLFD")))
    return 0;
  if ((fd = atoi(fdstr)) <= 0)
    return 0;
  if (write(fd, "y", 1) < 1)
    return 0;

  if (!(fdstr=getenv("SSLREADFD")))
    return 0;
  if ((fd = atoi(fdstr)) <= 0)
    return 0;
  if (dup2(fd, 0) != 0)
    return 0;

  if (!(fdstr=getenv("SSLWRITEFD")))
    return 0;
  if ((fd = atoi(fdstr)) <= 0)
    return 0;
  if (dup2(fd, 1) != 1)
    return 0;

  return 1;
}

static int cmd_STARTTLS(void)
{
  if (!tls_available)
    return respond(&resp_unimp);

  if (!respond(&resp_start))
    return 0;

  if (!starttls())
    return 0;

  tls_available = 0;
  return 1;
}

static const struct command commands[] = {
  { "STARTTLS", .fn_noparam = cmd_STARTTLS },
  { .name = 0 }
};

struct plugin plugin = {
  .version = PLUGIN_VERSION,
  .commands = commands,
  .init = init,
  .helo = helo,
};

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