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path: root/src/piesctl.c
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/* This file is part of GNU Pies.
   Copyright (C) 2015 Sergey Poznyakoff

   GNU Pies is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GNU Pies is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GNU Pies.  If not, see <http://www.gnu.org/licenses/>. */

#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <netdb.h>
#include <locale.h>
#include <errno.h>
#include <fcntl.h>
#include <configmake.h>
#include <grecs.h>
#include <grecs-locus.h>
#include <json.h>
#include <wordsplit.h>
#include <sysexits.h>
#include <termios.h>
#include "base64.h"
#include "progname.h"
#include "libpies.h"
#include "grecsasrt.h"

struct pies_url *default_url;           /* Control socket URL */
struct pies_url *url;
char const *instance = "pies";
char *config_file;   
char default_config_file[] = SYSCONFDIR "/piesctl.conf";
int preprocess_only;
int verbose;

static void config_help (void);

#include "piesctl-cl.h"

static struct grecs_keyword instance_keywords[] = {
  {"socket",
   N_("url: string"),
   N_("Socket URL for that instance."),
   grecs_type_string, GRECS_DFLT,
   NULL, 0, conf_callback_url},
  { NULL }
};

static int
callback_instance (enum grecs_callback_command cmd,
		   grecs_locus_t *locus,
		   void *varptr,
		   grecs_value_t *value, void *cb_data)
{
  switch (cmd)
    {
    case grecs_callback_section_begin:
      if (GRECS_VALUE_EMPTY_P (value))
	{
	  grecs_error (locus, 0, _("missing tag"));
	  return 1;
	}
      if (assert_grecs_value_type (&value->locus, value, GRECS_TYPE_STRING))
	return 1;
      if (!url && strcmp (value->v.string, instance) == 0)
	*(struct pies_url ***) cb_data = &url;
      else
	*(struct pies_url ***) cb_data = NULL;
      break;

    case grecs_callback_section_end:
      break;
      
    case grecs_callback_set_value:
      grecs_error (locus, 0, _("invalid use of block statement"));
    }
  return 0;
}

struct grecs_keyword piesctl_keywords[] = {
  {"socket",
   N_("url: string"),
   N_("Default socket URL."),
   grecs_type_string, GRECS_DFLT,
   &default_url, 0, conf_callback_url},
  {"instance",
   N_("name"),
   N_("Configure connection to a pies instance"),
   grecs_type_section, GRECS_DFLT,
   NULL, 0,
   callback_instance, NULL, instance_keywords },
  { NULL }
};

static void
parse_config ()
{
  char *file_name;
  struct grecs_node *tree;
  
  grecs_include_path_setup (DEFAULT_VERSION_INCLUDE_DIR,
			    DEFAULT_INCLUDE_DIR, NULL);
  grecs_log_to_stderr = 1;
  grecs_preprocessor = pp_command_line ();

  if (config_file)
    file_name = config_file;
  else if (access (default_config_file, F_OK) == 0)
    file_name = default_config_file;
  else
    file_name = NULL;

  if (file_name)
    {
      if (preprocess_only)
	exit (grecs_preproc_run (file_name, grecs_preprocessor)
	      ? EX_CONFIG : 0);
      if (verbose)
	printf ("%s: reading configuration from %s\n",
		program_name, file_name);
      tree = grecs_parse (file_name);
      if (!tree)
	exit (EX_CONFIG);
      if (grecs_tree_process (tree, piesctl_keywords))
	exit (EX_CONFIG);
      if (!url && verbose)
	printf ("%s: URL not found in %s\n",
		program_name, file_name);
    }

  if (!url)
    {
      /* Try local instance configuration */
      file_name = mkfilename (SYSCONFDIR, instance, ".conf");
      if (access (file_name, F_OK) == 0)
	{
	  struct grecs_node *node;

	  if (verbose)
	    printf ("%s: reading configuration from %s\n",
		    program_name, file_name);
	  if (preprocess_only)
	    exit (grecs_preproc_run (file_name, grecs_preprocessor)
		  ? EX_CONFIG : 0);
	  tree = grecs_parse (file_name);
	  node = grecs_find_node (tree, "/control/socket");
	  if (node)
	    {
	      assert_grecs_value_type (&node->locus,
				       node->v.value, GRECS_TYPE_STRING);
	      if (pies_url_create (&url, node->v.value->v.string))
		{
		  grecs_error (&node->locus, 0, _("%s: cannot create URL: %s"),
			       node->v.value->v.string, strerror (errno));
		  exit (EX_CONFIG);
		}
	    }
	  else if (verbose)
	    printf ("%s: URL not found in %s\n",
		    program_name, file_name);	
	}
      free (file_name);
    }

  if (!url)
    {
      if (strcmp (instance, "pies") == 0)
	{
	  if (verbose)
	    printf ("%s: falling back to default URL\n", program_name);
	  if (default_url)
	    url = default_url;
	  else
	    {
	      int rc;
	      size_t len = 0;
	      file_name = NULL;
	      grecs_asprintf (&file_name, &len, DEFAULT_CONTROL_URL, instance);
	      rc = pies_url_create (&url, file_name);
	      free (file_name);

	      if (rc)
		{
		  grecs_error (NULL, 0, _("%s: cannot create URL: %s"),
			       DEFAULT_CONTROL_URL, strerror (errno));
		  exit (EX_SOFTWARE);
		}
	    }
	}
      else
	{
	  grecs_error (NULL, 0, _("socket name for instance %s not configured"),
		       instance);
	  exit (EX_CONFIG);
	}
    }
  if (verbose)
    printf ("%s: using URL %s\n", program_name, url->string);
}

static void
config_help (void)
{
  static char docstring[] =
    /* TRANSLATORS: do not translate words between ` and ' */
    N_("Configuration file structure for piesctl.\n"
       "For more information, use `info piesctl configuration'.");
  grecs_print_docstring (docstring, 0, stdout);
  grecs_print_statement_array (piesctl_keywords, 1, 0, stdout);
}

static void
piesctl_diag(grecs_locus_t const *locus, int err, int errcode,
	     const char *msg)
{
  fflush (stdout);
  fprintf (stderr, "%s: ", program_name);
  if (locus)
    {
      YY_LOCATION_PRINT (stderr, *locus);
      fputc(':', stderr);
      fputc(' ', stderr);
    }
  if (!err)
    fprintf (stderr, "warning: ");
  fprintf (stderr, "%s", msg);
  if (errcode)
    fprintf (stderr, ": %s", strerror (errno));
  fputc ('\n', stderr);
}

enum http_method
  {
    METH_GET,
    METH_POST,
    METH_DELETE,
    METH_PUT,
    METH_OPTIONS,
    METH_INVALID
  };

char *method_names[] = {
  [METH_GET]     = "GET",
  [METH_POST]    = "POST",
  [METH_DELETE]  = "DELETE",
  [METH_PUT]     = "PUT",
  [METH_OPTIONS] = "OPTIONS",
  NULL
};

static char http_version[] = "HTTP/1.1";

struct shttp_io
{
  int code;
  struct grecs_symtab *headers;
  unsigned long content_length;
  char *content;
};

struct shttp_buf
{
  char *base;
  size_t size;
};

struct shttp_connection
{
  FILE *fp;
  struct pies_url *url;
  struct shttp_io req;
  struct shttp_io resp;
  struct shttp_buf sendbuf;
  struct shttp_buf readbuf;
  char *b64auth;
  char *status_line[3];
  struct json_value *result;
};
	       
struct http_header
{
  char *name;
  char *value;
};

static unsigned
http_header_hash (void *data, unsigned long n_buckets)
{
  const struct http_header *p = data;
  return grecs_hash_string_ci (p->name, n_buckets);
}

static int
http_header_compare (void const *data1, void const *data2)
{
  const struct http_header *p1 = data1;
  const struct http_header *p2 = data2;
  return strcasecmp (p1->name, p2->name);
}

static int
http_header_copy (void *a, void *b)
{
  struct http_header *dst = a;
  struct http_header *src = b;

  dst->name = grecs_strdup (src->name);
  dst->value = src->value ? grecs_strdup (src->value) : NULL;

  return 0;
}

static void
http_header_free (void *p)
{
  const struct http_header *h = p;
  grecs_free (h->name);
  grecs_free (h->value);
  free (p);
}

static void
shttp_io_init (struct shttp_io *io)
{
  io->code = 0;
  io->content_length = 0;
  grecs_free (io->content);
  io->content = NULL;
  grecs_symtab_clear (io->headers);
}

static int
shttp_io_header_put (struct shttp_io *io, char const *name,
		     char const *fmt, ...)
{
  int install = 1;
  struct http_header key, *ret;
  va_list ap;
  size_t len = 0;
  
  if (!io->headers)
    io->headers = grecs_symtab_create (sizeof (struct http_header),
				       http_header_hash,
				       http_header_compare,
				       http_header_copy,
				       NULL,
				       http_header_free);
  key.name = (char *) name;
  key.value = NULL;
  ret = grecs_symtab_lookup_or_install (io->headers, &key, &install);
  if (!ret)
    {
      grecs_error (NULL, 0, _("cannot install header %s: %s"),
		   name, strerror (errno));
      return 1;
    }
  if (!install)
    grecs_free (ret->value);
  va_start (ap, fmt);
  grecs_vasprintf (&ret->value, &len, fmt, ap);
  va_end (ap);
  return 0;
}

static char *
shttp_io_header_get (struct shttp_io *io, char const *name)
{
  struct http_header key, *ret;

  if (!io->headers)
    return NULL;
  key.name = (char*) name;
  ret = grecs_symtab_lookup_or_install (io->headers, &key, NULL);
  return ret ? ret->value : NULL;
} 

static void
shttp_io_free (struct shttp_io *io)
{
  grecs_symtab_free (io->headers);
  grecs_free (io->content);
}

static struct shttp_connection *
shttp_connect (struct pies_url *url)
{
  int fd;
  union pies_sockaddr_storage addr;
  socklen_t socklen;
  int flags;
  struct shttp_connection *conn;
  FILE *fp;
  
  if (strcmp (url->scheme, "unix") == 0
      || strcmp (url->scheme, "file") == 0
      || strcmp (url->scheme, "socket") == 0)
    {
      struct stat st;
		
      if (url->port)
	{
	  grecs_error (NULL, 0, _("%s: invalid connection type: "
				  "port is meaningless for UNIX sockets"),
		       url->string);
	  return NULL;
	}
		
      if (strlen (url->path) > sizeof addr.s_un.sun_path)
	{
	  errno = EINVAL;
	  grecs_error (NULL, 0,
		       _("%s: UNIX socket name too long"),
		       url->path);
	  return NULL;
	}
		
      addr.s.sa_family = PF_UNIX;
      socklen = sizeof (addr.s_un);
      strcpy (addr.s_un.sun_path, url->path);
		
      if (stat (url->path, &st))
	{
	  if (errno != ENOENT)
	    {
	      grecs_error (NULL, 0,
			   _("%s: cannot stat socket: %s"),
			   url->path,
			   strerror (errno));
	      return NULL;
	    }
	}
      else
	{
	  if (!S_ISSOCK (st.st_mode))
	    {
	      grecs_error (NULL, 0,
			   _("%s: not a socket"),
			   url->path);
	      return NULL;
	    }
	}
    }
  else if (strcmp (url->scheme, "inet") == 0)
    {
      short pnum;
      struct hostent *hp;
      
      addr.s_in.sin_family = PF_INET;
      socklen = sizeof (addr.s_in);

      pnum = url->port ? url->port : 8080;
      
      hp = gethostbyname (url->host);
      if (!hp)
	{
	  grecs_error (NULL, 0, _("%s: unknown host name"), url->string);
	  return NULL;
	}

      addr.s_in.sin_family = hp->h_addrtype;
      switch (hp->h_addrtype)
	{
	case AF_INET:
	  memmove (&addr.s_in.sin_addr, hp->h_addr, 4);
	  addr.s_in.sin_port = htons (pnum);
	  break;
	  
	default:
	  grecs_error (NULL, 0,
		       _("%s: invalid connection type: "
			 "unsupported address family"),
		       url->string);
	  return NULL;
	}
    }
  else
    {
      grecs_error (NULL, 0, _("%s: unsupported protocol"),
		   url->string);
      return NULL;
    }

  fd = socket (addr.s.sa_family, SOCK_STREAM, 0);
  if (fd == -1)
    {
      grecs_error (NULL, 0, _("%s: unable to create new socket: %s"),
		   url->string, strerror(errno));
      return NULL;
    }
  
  if ((flags = fcntl (fd, F_GETFD, 0)) == -1
      || fcntl (fd, F_SETFD, flags | FD_CLOEXEC) == -1) 
    grecs_error (NULL, 0,  _("%s: cannot set close-on-exec: %s"),
		 url->string, strerror (errno));

  // FIXME: Bind to local address
  
  if (connect (fd, &addr.s, socklen))
    {
      grecs_error (NULL, 0,  _("%s: cannot connect: %s"),
		   url->string, strerror (errno));
      close (fd);
      return NULL;
    }

  fp = fdopen (fd, "w+");
  if (!fp)
    {
      grecs_error (NULL, 0,  "fdopen: %s", strerror (errno));
      close (fd);
      return NULL;
    }

  conn = grecs_zalloc (sizeof (*conn));
  conn->fp = fp;
  if (pies_url_copy (&conn->url, url))
    grecs_alloc_die ();

  netrc_scan (conn->url);

  return conn;
}

static void
shttp_auth_free (struct shttp_connection *conn)
{
  if (conn->b64auth)
    {
      memset (conn->b64auth, 0, strlen (conn->b64auth));
      free (conn->b64auth);
      conn->b64auth = NULL;
    }
}

static void
shttp_status_line_free (struct shttp_connection *conn)
{
  free (conn->status_line[0]);
  free (conn->status_line[1]);
  free (conn->status_line[2]);
  conn->status_line[0] = NULL;
  conn->status_line[1] = NULL;
  conn->status_line[2] = NULL;
}

static void
shttp_close (struct shttp_connection *conn)
{
  fclose (conn->fp);
  pies_url_destroy (&conn->url);
  shttp_io_free (&conn->req);
  shttp_io_free (&conn->resp);
  grecs_free (conn->sendbuf.base);
  grecs_free (conn->readbuf.base);
  shttp_status_line_free (conn);
  shttp_auth_free (conn);
  json_value_free (conn->result);
  grecs_free (conn);
}

static void
shttp_send_line (struct shttp_connection *conn, char const *fmt, ...)
{
  va_list ap;
  va_start (ap, fmt);
  grecs_vasprintf (&conn->sendbuf.base, &conn->sendbuf.size, fmt, ap);
  va_end (ap);
  if (verbose > 1)
    printf ("> %s\n", conn->sendbuf.base);
  fprintf (conn->fp, "%s\r\n", conn->sendbuf.base);
}

static int
shttp_read_line (struct shttp_connection *conn)
{
  ssize_t rc;
  rc = grecs_getline (&conn->readbuf.base, &conn->readbuf.size, conn->fp);
  if (rc > 0)
    {
      if (conn->readbuf.base[--rc] == '\n')
	{
	  if (rc > 0 && conn->readbuf.base[rc-1] == '\r')
	    --rc;
	  conn->readbuf.base[rc] = 0;
	}
      if (verbose > 1)
	printf ("< %s\n", conn->readbuf.base);
      return 0;
    }
  else if (rc == 0)
    {
      if (verbose > 1)
	printf ("<EOF>\n");
      return 1;
    }
  grecs_error (NULL, errno, _("HTTP read error"));
  exit (EX_UNAVAILABLE);
}

static int
send_header (void *sym, void *data)
{
  struct http_header *h = sym;
  struct shttp_connection *conn = data;
  shttp_send_line (conn, "%s: %s", h->name, h->value);
  return 0;
}

static void
shttp_request_send (struct shttp_connection *conn, int method, char const *uri)
{
  shttp_io_init (&conn->req);  
  shttp_send_line (conn, "%s %s %s", method_names[method], uri, http_version);
  shttp_send_line (conn, "Host: %s",
		   conn->url->host ? conn->url->host : "localhost");
  if (conn->url->user)
    {
      shttp_auth_free (conn);

      grecs_asprintf (&conn->readbuf.base, &conn->readbuf.size, "%s:%s",
		      conn->url->user,
		      conn->url->passwd ? conn->url->passwd : 0);
      base64_encode_alloc (conn->readbuf.base, strlen (conn->readbuf.base),
			   &conn->b64auth);

      pies_url_free_user (conn->url);
      pies_url_free_passwd (conn->url);
    }

  if (conn->b64auth)
    shttp_send_line (conn, "Authorization: Basic %s", conn->b64auth);
  
  grecs_symtab_enumerate (conn->req.headers, send_header, conn);
  if (conn->req.content_length)
    {
      shttp_send_line (conn, "Content-Length: %lu", conn->req.content_length);
      shttp_send_line (conn, "Content-Type: application/json");
    }
  shttp_send_line (conn, "");
  if (conn->req.content_length)
    {
      size_t s = fwrite (conn->req.content, 1, conn->req.content_length,
			 conn->fp);
      if (s != conn->req.content_length)
	{
	  grecs_error (NULL, 0, _("wrote %lu of %lu bytes of content"),
		       (unsigned long) s, conn->req.content_length);
	  exit (EX_UNAVAILABLE);
	}
    }
}

#define ISWS(c) ((c) == ' ' || (c) == '\t')

static void
shttp_save_header (struct shttp_connection *conn)
{
  char *p;
  
  for (p = conn->readbuf.base; *p; p++)
    if (*p == ':')
      {
	*p++ = 0;
	p += strspn (p, " \t");
	shttp_io_header_put (&conn->resp, conn->readbuf.base, "%s", p);
	return;
      }
  
  grecs_error (NULL, 0, _("malformed header line: %s"),
	       conn->readbuf.base);
  exit (EX_UNAVAILABLE);
}

static void
shttp_get_reply (struct shttp_connection *conn)
{
  enum input_state { is_initial, is_headers, is_content } state = is_initial;
  char const *val;
  
  shttp_io_init (&conn->resp);
  shttp_status_line_free (conn);
  json_value_free (conn->result);
  conn->result = NULL;
  
  while (state != is_content)
    {
      if (shttp_read_line (conn))
	break;
      if (state == is_initial)
	{
	  unsigned long n;
	  char *p;
	  int rc;
	  
	  rc = strsplit3 (conn->readbuf.base, conn->status_line, 0);
	  if (rc == -1)
	    {
	      grecs_error (NULL, errno, "strsplit3");
	      exit (EX_OSERR);
	    }
	  else if (rc == 1)
	    {
	      grecs_error (NULL, 0, _("unexpected reply: %s"),
			   conn->readbuf.base);
	      exit (EX_UNAVAILABLE);
	    }
	  
	  if (strcmp (conn->status_line[0], http_version))
	    {
	      grecs_error (NULL, 0, _("unsupported HTTP version: %s"),
			   conn->status_line[0]);
	      exit (EX_UNAVAILABLE);
	    }
	  n = strtoul (conn->status_line[1], &p, 0);
	  if (*p || n > 599)
	    {
	      grecs_error (NULL, 0, _("bad reply status: %s"),
			   conn->readbuf.base);
	      exit (EX_UNAVAILABLE);
	    }
	  conn->resp.code = n;
	  
	  state = is_headers;
	}
      else if (state == is_headers)
	{
	  if (conn->readbuf.base[0])
	    shttp_save_header (conn);
	  else
	    state = is_content;
	}
    }

  val = shttp_io_header_get (&conn->resp, "content-length");
  if (val)
    {
      ssize_t rc;
      char *p;
      unsigned long len = strtoul (val, &p, 10);

      if (*p)
	{
	  grecs_error (NULL, 0, _("bad content length: %s"), val);
	  exit (EX_UNAVAILABLE);
	}

      if (len)
	{
	  conn->resp.content = grecs_malloc (len + 1);
	  conn->resp.content_length = len;
	  rc = fread (conn->resp.content, len, 1, conn->fp);
	  if (rc != 1)
	    {
	      grecs_error (NULL, ferror (conn->fp) ? errno : 0,
			   _("content read error"));
	      exit (EX_UNAVAILABLE);
	    }

	  val = shttp_io_header_get (&conn->resp, "content-type");
	  if (!val)
	    grecs_error (NULL, 0, _("no content type specified"));
	  else if (strcmp (val, "application/json"))
	    grecs_error (NULL, 0, _("unsupported content type: %s"), val);
	  else
	    {
	      conn->result = json_parse_string (conn->resp.content,
						    conn->resp.content_length);
	      if (!conn->result)
		{
		  grecs_error (&json_err_locus, 0,
			       "%s", json_err_diag);
		  grecs_error (NULL, 0, _("original json was: %s"),
			       conn->resp.content);
		  grecs_error (NULL, 0, _("original status line: %s %s %s"),
			       conn->status_line[0],
			       conn->status_line[1],
			       conn->status_line[2]);
		  exit (EX_UNAVAILABLE);
		}
	    }
	}
    }
}

static void
stderr_writer (void *closure, char const *text, size_t len)
{
  fwrite (text, len, 1, stderr);
}

static void
shttp_format_result (struct shttp_connection *conn)
{
  struct json_format fmt = {
    .indent = 2,
    .precision = 0,
    .write = stderr_writer,
  };
  fprintf (stderr, "%s: raw JSON reply follows:\n", program_name);
  json_format_value (conn->result, &fmt);
}

static void
shttp_fatal (struct shttp_connection *conn)
{
  struct json_value *jv;

  if (conn->result && (jv = json_value_lookup (conn->result, "error_message")))
    {
      if (jv->type == json_string)
	grecs_error (NULL, 0, "%s", jv->v.s);
      else
	shttp_format_result (conn);
    }
  else
    grecs_error (NULL, 0, "%s", conn->status_line[2]);

  exit (1);
}

static void
echo_off (struct termios *stored_settings)
{
  struct termios new_settings;
  tcgetattr (0, stored_settings);
  new_settings = *stored_settings;
  new_settings.c_lflag &= (~ECHO);
  tcsetattr (0, TCSANOW, &new_settings);
}

static void
echo_on (struct termios *stored_settings)
{
  tcsetattr (0, TCSANOW, stored_settings);
}

static char *
getans (int echo, const char *fmt, ...)
{
  struct termios stored_settings;
  char *reply = NULL;
  size_t reply_len = 0;
  size_t len;
  va_list ap;

  va_start (ap, fmt);
  vprintf (fmt, ap);
  va_end (ap);
  printf (": ");
  fflush (stdout);
  if (!echo)
    echo_off (&stored_settings);
  grecs_getline (&reply, &reply_len, stdin);
  if (!echo)
    {
      echo_on (&stored_settings);
      putchar ('\n');
      fflush (stdout);
    }
  len = strlen (reply);
  if (len)
    reply[len - 1] = 0;
  return reply;
}

static void
shttp_get_credentials (struct shttp_connection *conn)
{
  char const *val = shttp_io_header_get (&conn->resp, "WWW-Authenticate");
  char *realm = NULL;
  
  if (val)
    {
      struct wordsplit ws;
      if (wordsplit (val, &ws,
		     WRDSF_NOVAR | WRDSF_NOCMD
		     | WRDSF_QUOTE | WRDSF_SQUEEZE_DELIMS))
	grecs_error (NULL, 0, "wordsplit: %s", wordsplit_strerror (&ws));
      else 
	{
	  if (ws.ws_wordc > 0)
	    {
	      size_t i;
	      
	      if (strcmp (ws.ws_wordv[0], "Basic"))
		{
		  grecs_error (NULL, 0,
			       _("unsupported authentication type: %s"),
			       ws.ws_wordv[0]);
		  shttp_fatal (conn);
		}
	      for (i = 1; i < ws.ws_wordc; i++)
		if (strncmp (ws.ws_wordv[i], "realm=", 6) == 0)
		  {
		    realm = grecs_strdup (ws.ws_wordv[i] + 6);
		    break;
		  }
	    }
	  wordsplit_free (&ws);
	}
    }
  
  if (!realm)
    realm = grecs_strdup ("Server");

  conn->url->user = getans (1, "%s user", realm);
  conn->url->passwd = getans (0, "%s password", realm);

  grecs_free (realm);
}

static void
shttp_process (struct shttp_connection *conn, int method, char const *uri)
{
  for (;;)
    {
      shttp_request_send (conn, method, uri);
      shttp_get_reply (conn);
      if (conn->resp.code / 100 == 2)
	return;
      if (conn->resp.code == 401 && isatty (fileno (stdin)))
	shttp_get_credentials (conn);
      else
	shttp_fatal (conn);
    }
}  

static int
com_list (struct shttp_connection *conn, int argc, char **argv)
{
  shttp_process (conn, METH_GET, "/programs");
  return 0;
}

static int
com_stop (struct shttp_connection *conn, int argc, char **argv)
{
  abort ();
  return 0;
}

static int
com_start (struct shttp_connection *conn, int argc, char **argv)
{
  abort ();
  return 0;
}

static int
com_restart (struct shttp_connection *conn, int argc, char **argv)
{
  abort ();
  return 0;
}

static int
com_shutdown (struct shttp_connection *conn, int argc, char **argv)
{
  abort ();
  return 0;
}

static int
com_reboot (struct shttp_connection *conn, int argc, char **argv)
{
  abort ();
  return 0;
}

typedef int (*ctlcom_t) (struct shttp_connection *, int, char **);

struct comtab
{
  char const *name;
  ctlcom_t command;
};

static struct comtab comtab[] = {
  { "list", com_list },
  { "stop", com_stop },
  { "start", com_start },
  { "restart", com_restart },
  { "shutdown", com_shutdown },
  { "reboot", com_reboot },
  { NULL }
};

static struct comtab *
find_command (char const *name)
{
  struct comtab *p, *match = NULL;
  size_t match_count = 0;
  size_t len = strlen (name);
  
  for (p = comtab; p->name; p++)
    if (len <= strlen (p->name)
	&& memcmp (p->name, name, len) == 0)
      {
	if (!match)
	  {
	    match = p;
	    ++match_count;
	  }
	else 
	  {
	    if (match_count == 1)
	      fprintf (stderr, _("%s: ambiguous command %s:\n"),
		       program_name, name);
	    ++match_count;
	    fprintf (stderr, "    %s\n", p->name);
	  }
      }
  
  if (match_count == 0)
    {
      grecs_error (NULL, 0, _("unknown command: %s"), name);
      exit (EX_USAGE);
    }
  else if (match_count > 1)
    exit (EX_USAGE);
  
  return match;
}


int
main (int argc, char **argv)
{
  int i, rc;
  struct shttp_connection *conn;
  struct comtab *cmd;
  
  set_program_name (argv[0]);
#ifdef ENABLE_NLS
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);
#endif
  grecs_print_diag_fun = piesctl_diag;
  
  parse_options (argc, argv, &i);
  argc -= i;
  argv += i;
  
  parse_config ();

  conn = shttp_connect (url);
  if (!conn)
    return EX_UNAVAILABLE;

  cmd = find_command (argv[0]);
  argv[0] = (char*) cmd->name;
  rc = cmd->command (conn, argc, argv);
  shttp_close (conn);
  return rc;
}

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