/*
     This file is part of GNUnet.
     Copyright (C) 2009, 2012 GNUnet e.V.

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

     GNUnet 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
     Affero General Public License for more details.

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

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @file util/service.c
 * @brief functions related to starting services
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_constants.h"
#include "gnunet_resolver_service.h"

#if HAVE_MALLINFO
#include <malloc.h>
#include "gauger.h"
#endif


/* ******************* access control ******************** */

/**
 * Check if the given IP address is in the list of IP addresses.
 *
 * @param list a list of networks
 * @param add the IP to check (in network byte order)
 * @return #GNUNET_NO if the IP is not in the list, #GNUNET_YES if it it is
 */
static int
check_ipv4_listed(const struct GNUNET_STRINGS_IPv4NetworkPolicy *list,
                  const struct in_addr *add)
{
  unsigned int i;

  if (NULL == list)
    return GNUNET_NO;
  i = 0;
  while ((list[i].network.s_addr != 0) || (list[i].netmask.s_addr != 0))
    {
      if ((add->s_addr & list[i].netmask.s_addr) ==
          (list[i].network.s_addr & list[i].netmask.s_addr))
        return GNUNET_YES;
      i++;
    }
  return GNUNET_NO;
}


/**
 * Check if the given IP address is in the list of IP addresses.
 *
 * @param list a list of networks
 * @param ip the IP to check (in network byte order)
 * @return #GNUNET_NO if the IP is not in the list, #GNUNET_YES if it it is
 */
static int
check_ipv6_listed(const struct GNUNET_STRINGS_IPv6NetworkPolicy *list,
                  const struct in6_addr *ip)
{
  unsigned int i;
  unsigned int j;
  struct in6_addr zero;

  if (NULL == list)
    return GNUNET_NO;
  memset(&zero, 0, sizeof(struct in6_addr));
  i = 0;
NEXT:
  while (0 != memcmp(&zero, &list[i].network, sizeof(struct in6_addr)))
    {
      for (j = 0; j < sizeof(struct in6_addr) / sizeof(int); j++)
        if (((((int *)ip)[j] & ((int *)&list[i].netmask)[j])) !=
            (((int *)&list[i].network)[j] & ((int *)&list[i].netmask)[j]))
          {
            i++;
            goto NEXT;
          }
      return GNUNET_YES;
    }
  return GNUNET_NO;
}


/* ****************** service struct ****************** */


/**
 * Context for "service_task".
 */
struct LEGACY_SERVICE_Context {
  /**
   * Our configuration.
   */
  const struct GNUNET_CONFIGURATION_Handle *cfg;

  /**
   * Handle for the server.
   */
  struct GNUNET_SERVER_Handle *server;

  /**
   * NULL-terminated array of addresses to bind to, NULL if we got pre-bound
   * listen sockets.
   */
  struct sockaddr **addrs;

  /**
   * Name of our service.
   */
  const char *service_name;

  /**
   * Main service-specific task to run.
   */
  LEGACY_SERVICE_Main task;

  /**
   * Closure for @e task.
   */
  void *task_cls;

  /**
   * IPv4 addresses that are not allowed to connect.
   */
  struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_denied;

  /**
   * IPv6 addresses that are not allowed to connect.
   */
  struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_denied;

  /**
   * IPv4 addresses that are allowed to connect (if not
   * set, all are allowed).
   */
  struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_allowed;

  /**
   * IPv6 addresses that are allowed to connect (if not
   * set, all are allowed).
   */
  struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_allowed;

  /**
   * My (default) message handlers.  Adjusted copy
   * of "defhandlers".
   */
  struct GNUNET_SERVER_MessageHandler *my_handlers;

  /**
   * Array of the lengths of the entries in addrs.
   */
  socklen_t *addrlens;

  /**
   * NULL-terminated array of listen sockets we should take over.
   */
  struct GNUNET_NETWORK_Handle **lsocks;

  /**
   * Task ID of the shutdown task.
   */
  struct GNUNET_SCHEDULER_Task *shutdown_task;

  /**
   * Idle timeout for server.
   */
  struct GNUNET_TIME_Relative timeout;

  /**
   * Overall success/failure of the service start.
   */
  int ret;

  /**
   * If we are daemonizing, this FD is set to the
   * pipe to the parent.  Send '.' if we started
   * ok, '!' if not.  -1 if we are not daemonizing.
   */
  int ready_confirm_fd;

  /**
   * Do we close connections if we receive messages
   * for which we have no handler?
   */
  int require_found;

  /**
   * Do we require a matching UID for UNIX domain socket connections?
   * #GNUNET_NO means that the UID does not have to match (however,
   * @e match_gid may still impose other access control checks).
   */
  int match_uid;

  /**
   * Do we require a matching GID for UNIX domain socket connections?
   * Ignored if @e match_uid is #GNUNET_YES.  Note that this is about
   * checking that the client's UID is in our group OR that the
   * client's GID is our GID.  If both "match_gid" and @e match_uid are
   * #GNUNET_NO, all users on the local system have access.
   */
  int match_gid;

  /**
   * Our options.
   */
  enum LEGACY_SERVICE_Options options;
};


/* ****************** message handlers ****************** */

/**
 * Send a 'TEST' message back to the client.
 *
 * @param cls the 'struct GNUNET_SERVER_Client' to send TEST to
 * @param size number of bytes available in 'buf'
 * @param buf where to copy the message
 * @return number of bytes written to 'buf'
 */
static size_t
write_test(void *cls, size_t size, void *buf)
{
  struct GNUNET_SERVER_Client *client = cls;
  struct GNUNET_MessageHeader *msg;

  if (size < sizeof(struct GNUNET_MessageHeader))
    {
      GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
      return 0; /* client disconnected */
    }
  msg = (struct GNUNET_MessageHeader *)buf;
  msg->type = htons(GNUNET_MESSAGE_TYPE_TEST);
  msg->size = htons(sizeof(struct GNUNET_MessageHeader));
  GNUNET_SERVER_receive_done(client, GNUNET_OK);
  return sizeof(struct GNUNET_MessageHeader);
}


/**
 * Handler for TEST message.
 *
 * @param cls closure (refers to service)
 * @param client identification of the client
 * @param message the actual message
 */
static void
handle_test(void *cls,
            struct GNUNET_SERVER_Client *client,
            const struct GNUNET_MessageHeader *message)
{
  /* simply bounce message back to acknowledge */
  if (NULL ==
      GNUNET_SERVER_notify_transmit_ready(client,
                                          sizeof(struct GNUNET_MessageHeader),
                                          GNUNET_TIME_UNIT_FOREVER_REL,
                                          &write_test,
                                          client))
    GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
}


/**
 * Default handlers for all services.  Will be copied and the
 * "callback_cls" fields will be replaced with the specific service
 * struct.
 */
static const struct GNUNET_SERVER_MessageHandler defhandlers[] =
{ { &handle_test,
    NULL,
    GNUNET_MESSAGE_TYPE_TEST,
    sizeof(struct GNUNET_MessageHeader) },
  { NULL, NULL, 0, 0 } };


/* ****************** service core routines ************** */


/**
 * Check if access to the service is allowed from the given address.
 *
 * @param cls closure
 * @param uc credentials, if available, otherwise NULL
 * @param addr address
 * @param addrlen length of address
 * @return #GNUNET_YES to allow, #GNUNET_NO to deny, #GNUNET_SYSERR
 *   for unknown address family (will be denied).
 */
static int
check_access(void *cls,
             const struct GNUNET_CONNECTION_Credentials *uc,
             const struct sockaddr *addr,
             socklen_t addrlen)
{
  struct LEGACY_SERVICE_Context *sctx = cls;
  const struct sockaddr_in *i4;
  const struct sockaddr_in6 *i6;
  int ret;

  switch (addr->sa_family)
    {
    case AF_INET:
      GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
      i4 = (const struct sockaddr_in *)addr;
      ret = ((NULL == sctx->v4_allowed) ||
             (check_ipv4_listed(sctx->v4_allowed, &i4->sin_addr))) &&
            ((NULL == sctx->v4_denied) ||
             (!check_ipv4_listed(sctx->v4_denied, &i4->sin_addr)));
      break;

    case AF_INET6:
      GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
      i6 = (const struct sockaddr_in6 *)addr;
      ret = ((NULL == sctx->v6_allowed) ||
             (check_ipv6_listed(sctx->v6_allowed, &i6->sin6_addr))) &&
            ((NULL == sctx->v6_denied) ||
             (!check_ipv6_listed(sctx->v6_denied, &i6->sin6_addr)));
      break;

#ifndef WINDOWS
    case AF_UNIX:
      ret = GNUNET_OK; /* controlled using file-system ACL now */
      break;
#endif
    default:
      LOG(GNUNET_ERROR_TYPE_WARNING,
          _("Unknown address family %d\n"),
          addr->sa_family);
      return GNUNET_SYSERR;
    }
  if (GNUNET_OK != ret)
    {
      LOG(GNUNET_ERROR_TYPE_WARNING,
          _("Access from `%s' denied to service `%s'\n"),
          GNUNET_a2s(addr, addrlen),
          sctx->service_name);
    }
  return ret;
}


/**
 * Get the name of the file where we will
 * write the PID of the service.
 *
 * @param sctx service context
 * @return name of the file for the process ID
 */
static char *
get_pid_file_name(struct LEGACY_SERVICE_Context *sctx)
{
  char *pif;

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename(sctx->cfg,
                                                           sctx->service_name,
                                                           "PIDFILE",
                                                           &pif))
    return NULL;
  return pif;
}


/**
 * Parse an IPv4 access control list.
 *
 * @param ret location where to write the ACL (set)
 * @param sctx service context to use to get the configuration
 * @param option name of the ACL option to parse
 * @return #GNUNET_SYSERR on parse error, #GNUNET_OK on success (including
 *         no ACL configured)
 */
static int
process_acl4(struct GNUNET_STRINGS_IPv4NetworkPolicy **ret,
             struct LEGACY_SERVICE_Context *sctx,
             const char *option)
{
  char *opt;

  if (!GNUNET_CONFIGURATION_have_value(sctx->cfg, sctx->service_name, option))
    {
      *ret = NULL;
      return GNUNET_OK;
    }
  GNUNET_break(GNUNET_OK ==
               GNUNET_CONFIGURATION_get_value_string(sctx->cfg,
                                                     sctx->service_name,
                                                     option,
                                                     &opt));
  if (NULL == (*ret = GNUNET_STRINGS_parse_ipv4_policy(opt)))
    {
      LOG(GNUNET_ERROR_TYPE_WARNING,
          _("Could not parse IPv4 network specification `%s' for `%s:%s'\n"),
          opt,
          sctx->service_name,
          option);
      GNUNET_free(opt);
      return GNUNET_SYSERR;
    }
  GNUNET_free(opt);
  return GNUNET_OK;
}


/**
 * Parse an IPv6 access control list.
 *
 * @param ret location where to write the ACL (set)
 * @param sctx service context to use to get the configuration
 * @param option name of the ACL option to parse
 * @return #GNUNET_SYSERR on parse error, #GNUNET_OK on success (including
 *         no ACL configured)
 */
static int
process_acl6(struct GNUNET_STRINGS_IPv6NetworkPolicy **ret,
             struct LEGACY_SERVICE_Context *sctx,
             const char *option)
{
  char *opt;

  if (!GNUNET_CONFIGURATION_have_value(sctx->cfg, sctx->service_name, option))
    {
      *ret = NULL;
      return GNUNET_OK;
    }
  GNUNET_break(GNUNET_OK ==
               GNUNET_CONFIGURATION_get_value_string(sctx->cfg,
                                                     sctx->service_name,
                                                     option,
                                                     &opt));
  if (NULL == (*ret = GNUNET_STRINGS_parse_ipv6_policy(opt)))
    {
      LOG(GNUNET_ERROR_TYPE_WARNING,
          _("Could not parse IPv6 network specification `%s' for `%s:%s'\n"),
          opt,
          sctx->service_name,
          option);
      GNUNET_free(opt);
      return GNUNET_SYSERR;
    }
  GNUNET_free(opt);
  return GNUNET_OK;
}


/**
 * Add the given UNIX domain path as an address to the
 * list (as the first entry).
 *
 * @param saddrs array to update
 * @param saddrlens where to store the address length
 * @param unixpath path to add
 * @param abstract #GNUNET_YES to add an abstract UNIX domain socket.  This
 *          parameter is ignore on systems other than LINUX
 */
static void
add_unixpath(struct sockaddr **saddrs,
             socklen_t *saddrlens,
             const char *unixpath,
             int abstract)
{
#ifdef AF_UNIX
  struct sockaddr_un *un;

  un = GNUNET_new(struct sockaddr_un);
  un->sun_family = AF_UNIX;
  GNUNET_strlcpy(un->sun_path, unixpath, sizeof(un->sun_path));
#ifdef LINUX
  if (GNUNET_YES == abstract)
    un->sun_path[0] = '\0';
#endif
#if HAVE_SOCKADDR_UN_SUN_LEN
  un->sun_len = (u_char)sizeof(struct sockaddr_un);
#endif
  *saddrs = (struct sockaddr *)un;
  *saddrlens = sizeof(struct sockaddr_un);
#else
  /* this function should never be called
   * unless AF_UNIX is defined! */
  GNUNET_assert(0);
#endif
}


/**
 * Get the list of addresses that a server for the given service
 * should bind to.
 *
 * @param service_name name of the service
 * @param cfg configuration (which specifies the addresses)
 * @param addrs set (call by reference) to an array of pointers to the
 *              addresses the server should bind to and listen on; the
 *              array will be NULL-terminated (on success)
 * @param addr_lens set (call by reference) to an array of the lengths
 *              of the respective `struct sockaddr` struct in the @a addrs
 *              array (on success)
 * @return number of addresses found on success,
 *              #GNUNET_SYSERR if the configuration
 *              did not specify reasonable finding information or
 *              if it specified a hostname that could not be resolved;
 *              #GNUNET_NO if the number of addresses configured is
 *              zero (in this case, `*addrs` and `*addr_lens` will be
 *              set to NULL).
 */
int
LEGACY_SERVICE_get_server_addresses(
  const char *service_name,
  const struct GNUNET_CONFIGURATION_Handle *cfg,
  struct sockaddr ***addrs,
  socklen_t **addr_lens)
{
  int disablev6;
  struct GNUNET_NETWORK_Handle *desc;
  unsigned long long port;
  char *unixpath;
  struct addrinfo hints;
  struct addrinfo *res;
  struct addrinfo *pos;
  struct addrinfo *next;
  unsigned int i;
  int resi;
  int ret;
  int abstract;
  struct sockaddr **saddrs;
  socklen_t *saddrlens;
  char *hostname;

  *addrs = NULL;
  *addr_lens = NULL;
  desc = NULL;
  if (GNUNET_CONFIGURATION_have_value(cfg, service_name, "DISABLEV6"))
    {
      if (GNUNET_SYSERR ==
          (disablev6 = GNUNET_CONFIGURATION_get_value_yesno(cfg,
                                                            service_name,
                                                            "DISABLEV6")))
        return GNUNET_SYSERR;
    }
  else
    disablev6 = GNUNET_NO;

  if (!disablev6)
    {
      /* probe IPv6 support */
      desc = GNUNET_NETWORK_socket_create(PF_INET6, SOCK_STREAM, 0);
      if (NULL == desc)
        {
          if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) ||
              (EACCES == errno))
            {
              LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "socket");
              return GNUNET_SYSERR;
            }
          LOG(GNUNET_ERROR_TYPE_INFO,
              _(
                "Disabling IPv6 support for service `%s', failed to create IPv6 socket: %s\n"),
              service_name,
              strerror(errno));
          disablev6 = GNUNET_YES;
        }
      else
        {
          GNUNET_break(GNUNET_OK == GNUNET_NETWORK_socket_close(desc));
          desc = NULL;
        }
    }

  port = 0;
  if (GNUNET_CONFIGURATION_have_value(cfg, service_name, "PORT"))
    {
      if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number(cfg,
                                                             service_name,
                                                             "PORT",
                                                             &port))
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Require valid port number for service `%s' in configuration!\n"),
              service_name);
        }
      if (port > 65535)
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Require valid port number for service `%s' in configuration!\n"),
              service_name);
          return GNUNET_SYSERR;
        }
    }

  if (GNUNET_CONFIGURATION_have_value(cfg, service_name, "BINDTO"))
    {
      GNUNET_break(GNUNET_OK ==
                   GNUNET_CONFIGURATION_get_value_string(cfg,
                                                         service_name,
                                                         "BINDTO",
                                                         &hostname));
    }
  else
    hostname = NULL;

  unixpath = NULL;
  abstract = GNUNET_NO;
#ifdef AF_UNIX
  if ((GNUNET_YES ==
       GNUNET_CONFIGURATION_have_value(cfg, service_name, "UNIXPATH")) &&
      (GNUNET_OK == GNUNET_CONFIGURATION_get_value_filename(cfg,
                                                            service_name,
                                                            "UNIXPATH",
                                                            &unixpath)) &&
      (0 < strlen(unixpath)))
    {
      /* probe UNIX support */
      struct sockaddr_un s_un;

      if (strlen(unixpath) >= sizeof(s_un.sun_path))
        {
          LOG(GNUNET_ERROR_TYPE_WARNING,
              _("UNIXPATH `%s' too long, maximum length is %llu\n"),
              unixpath,
              (unsigned long long)sizeof(s_un.sun_path));
          unixpath = GNUNET_NETWORK_shorten_unixpath(unixpath);
          LOG(GNUNET_ERROR_TYPE_INFO, _("Using `%s' instead\n"), unixpath);
        }
#ifdef LINUX
      abstract = GNUNET_CONFIGURATION_get_value_yesno(cfg,
                                                      "TESTING",
                                                      "USE_ABSTRACT_SOCKETS");
      if (GNUNET_SYSERR == abstract)
        abstract = GNUNET_NO;
#endif
      if ((GNUNET_YES != abstract) &&
          (GNUNET_OK != GNUNET_DISK_directory_create_for_file(unixpath)))
        GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_ERROR, "mkdir", unixpath);
    }
  if (NULL != unixpath)
    {
      desc = GNUNET_NETWORK_socket_create(AF_UNIX, SOCK_STREAM, 0);
      if (NULL == desc)
        {
          if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) ||
              (EACCES == errno))
            {
              LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "socket");
              GNUNET_free_non_null(hostname);
              GNUNET_free(unixpath);
              return GNUNET_SYSERR;
            }
          LOG(GNUNET_ERROR_TYPE_INFO,
              _(
                "Disabling UNIX domain socket support for service `%s', failed to create UNIX domain socket: %s\n"),
              service_name,
              strerror(errno));
          GNUNET_free(unixpath);
          unixpath = NULL;
        }
      else
        {
          GNUNET_break(GNUNET_OK == GNUNET_NETWORK_socket_close(desc));
          desc = NULL;
        }
    }
#endif

  if ((0 == port) && (NULL == unixpath))
    {
      LOG(GNUNET_ERROR_TYPE_ERROR,
          _(
            "Have neither PORT nor UNIXPATH for service `%s', but one is required\n"),
          service_name);
      GNUNET_free_non_null(hostname);
      return GNUNET_SYSERR;
    }
  if (0 == port)
    {
      saddrs = GNUNET_malloc(2 * sizeof(struct sockaddr *));
      saddrlens = GNUNET_malloc(2 * sizeof(socklen_t));
      add_unixpath(saddrs, saddrlens, unixpath, abstract);
      GNUNET_free_non_null(unixpath);
      GNUNET_free_non_null(hostname);
      *addrs = saddrs;
      *addr_lens = saddrlens;
      return 1;
    }

  if (NULL != hostname)
    {
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Resolving `%s' since that is where `%s' will bind to.\n",
          hostname,
          service_name);
      memset(&hints, 0, sizeof(struct addrinfo));
      if (disablev6)
        hints.ai_family = AF_INET;
      hints.ai_protocol = IPPROTO_TCP;
      if ((0 != (ret = getaddrinfo(hostname, NULL, &hints, &res))) ||
          (NULL == res))
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Failed to resolve `%s': %s\n"),
              hostname,
              gai_strerror(ret));
          GNUNET_free(hostname);
          GNUNET_free_non_null(unixpath);
          return GNUNET_SYSERR;
        }
      next = res;
      i = 0;
      while (NULL != (pos = next))
        {
          next = pos->ai_next;
          if ((disablev6) && (pos->ai_family == AF_INET6))
            continue;
          i++;
        }
      if (0 == i)
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Failed to find %saddress for `%s'.\n"),
              disablev6 ? "IPv4 " : "",
              hostname);
          freeaddrinfo(res);
          GNUNET_free(hostname);
          GNUNET_free_non_null(unixpath);
          return GNUNET_SYSERR;
        }
      resi = i;
      if (NULL != unixpath)
        resi++;
      saddrs = GNUNET_malloc((resi + 1) * sizeof(struct sockaddr *));
      saddrlens = GNUNET_malloc((resi + 1) * sizeof(socklen_t));
      i = 0;
      if (NULL != unixpath)
        {
          add_unixpath(saddrs, saddrlens, unixpath, abstract);
          i++;
        }
      next = res;
      while (NULL != (pos = next))
        {
          next = pos->ai_next;
          if ((disablev6) && (AF_INET6 == pos->ai_family))
            continue;
          if ((IPPROTO_TCP != pos->ai_protocol) && (0 != pos->ai_protocol))
            continue; /* not TCP */
          if ((SOCK_STREAM != pos->ai_socktype) && (0 != pos->ai_socktype))
            continue; /* huh? */
          LOG(GNUNET_ERROR_TYPE_DEBUG,
              "Service `%s' will bind to `%s'\n",
              service_name,
              GNUNET_a2s(pos->ai_addr, pos->ai_addrlen));
          if (AF_INET == pos->ai_family)
            {
              GNUNET_assert(sizeof(struct sockaddr_in) == pos->ai_addrlen);
              saddrlens[i] = pos->ai_addrlen;
              saddrs[i] = GNUNET_malloc(saddrlens[i]);
              GNUNET_memcpy(saddrs[i], pos->ai_addr, saddrlens[i]);
              ((struct sockaddr_in *)saddrs[i])->sin_port = htons(port);
            }
          else
            {
              GNUNET_assert(AF_INET6 == pos->ai_family);
              GNUNET_assert(sizeof(struct sockaddr_in6) == pos->ai_addrlen);
              saddrlens[i] = pos->ai_addrlen;
              saddrs[i] = GNUNET_malloc(saddrlens[i]);
              GNUNET_memcpy(saddrs[i], pos->ai_addr, saddrlens[i]);
              ((struct sockaddr_in6 *)saddrs[i])->sin6_port = htons(port);
            }
          i++;
        }
      GNUNET_free(hostname);
      freeaddrinfo(res);
      resi = i;
    }
  else
    {
      /* will bind against everything, just set port */
      if (disablev6)
        {
          /* V4-only */
          resi = 1;
          if (NULL != unixpath)
            resi++;
          i = 0;
          saddrs = GNUNET_malloc((resi + 1) * sizeof(struct sockaddr *));
          saddrlens = GNUNET_malloc((resi + 1) * sizeof(socklen_t));
          if (NULL != unixpath)
            {
              add_unixpath(saddrs, saddrlens, unixpath, abstract);
              i++;
            }
          saddrlens[i] = sizeof(struct sockaddr_in);
          saddrs[i] = GNUNET_malloc(saddrlens[i]);
#if HAVE_SOCKADDR_IN_SIN_LEN
          ((struct sockaddr_in *)saddrs[i])->sin_len = saddrlens[i];
#endif
          ((struct sockaddr_in *)saddrs[i])->sin_family = AF_INET;
          ((struct sockaddr_in *)saddrs[i])->sin_port = htons(port);
        }
      else
        {
          /* dual stack */
          resi = 2;
          if (NULL != unixpath)
            resi++;
          saddrs = GNUNET_malloc((resi + 1) * sizeof(struct sockaddr *));
          saddrlens = GNUNET_malloc((resi + 1) * sizeof(socklen_t));
          i = 0;
          if (NULL != unixpath)
            {
              add_unixpath(saddrs, saddrlens, unixpath, abstract);
              i++;
            }
          saddrlens[i] = sizeof(struct sockaddr_in6);
          saddrs[i] = GNUNET_malloc(saddrlens[i]);
#if HAVE_SOCKADDR_IN_SIN_LEN
          ((struct sockaddr_in6 *)saddrs[i])->sin6_len = saddrlens[0];
#endif
          ((struct sockaddr_in6 *)saddrs[i])->sin6_family = AF_INET6;
          ((struct sockaddr_in6 *)saddrs[i])->sin6_port = htons(port);
          i++;
          saddrlens[i] = sizeof(struct sockaddr_in);
          saddrs[i] = GNUNET_malloc(saddrlens[i]);
#if HAVE_SOCKADDR_IN_SIN_LEN
          ((struct sockaddr_in *)saddrs[i])->sin_len = saddrlens[1];
#endif
          ((struct sockaddr_in *)saddrs[i])->sin_family = AF_INET;
          ((struct sockaddr_in *)saddrs[i])->sin_port = htons(port);
        }
    }
  GNUNET_free_non_null(unixpath);
  *addrs = saddrs;
  *addr_lens = saddrlens;
  return resi;
}


#ifdef MINGW
/**
 * Read listen sockets from the parent process (ARM).
 *
 * @param sctx service context to initialize
 * @return #GNUNET_YES if ok, #GNUNET_NO if not ok (must bind yourself),
 * and #GNUNET_SYSERR on error.
 */
static int
receive_sockets_from_parent(struct LEGACY_SERVICE_Context *sctx)
{
  const char *env_buf;
  int fail;
  uint64_t count;
  uint64_t i;
  HANDLE lsocks_pipe;

  env_buf = getenv("GNUNET_OS_READ_LSOCKS");
  if ((NULL == env_buf) || (strlen(env_buf) <= 0))
    return GNUNET_NO;
  /* Using W32 API directly here, because this pipe will
   * never be used outside of this function, and it's just too much of a bother
   * to create a GNUnet API that boxes a HANDLE (the way it is done with socks)
   */
  lsocks_pipe = (HANDLE)strtoul(env_buf, NULL, 10);
  if ((0 == lsocks_pipe) || (INVALID_HANDLE_VALUE == lsocks_pipe))
    return GNUNET_NO;
  fail = 1;
  do
    {
      int ret;
      int fail2;
      DWORD rd;

      ret = ReadFile(lsocks_pipe, &count, sizeof(count), &rd, NULL);
      if ((0 == ret) || (sizeof(count) != rd) || (0 == count))
        break;
      sctx->lsocks =
        GNUNET_malloc(sizeof(struct GNUNET_NETWORK_Handle *) * (count + 1));

      fail2 = 1;
      for (i = 0; i < count; i++)
        {
          WSAPROTOCOL_INFOA pi;
          uint64_t size;
          SOCKET s;

          ret = ReadFile(lsocks_pipe, &size, sizeof(size), &rd, NULL);
          if ((0 == ret) || (sizeof(size) != rd) || (sizeof(pi) != size))
            break;
          ret = ReadFile(lsocks_pipe, &pi, sizeof(pi), &rd, NULL);
          if ((0 == ret) || (sizeof(pi) != rd))
            break;
          s = WSASocketA(pi.iAddressFamily,
                         pi.iSocketType,
                         pi.iProtocol,
                         &pi,
                         0,
                         WSA_FLAG_OVERLAPPED);
          sctx->lsocks[i] = GNUNET_NETWORK_socket_box_native(s);
          if (NULL == sctx->lsocks[i])
            break;
          else if (i == count - 1)
            fail2 = 0;
        }
      if (fail2)
        break;
      sctx->lsocks[count] = NULL;
      fail = 0;
    }
  while (fail);

  CloseHandle(lsocks_pipe);

  if (fail)
    {
      LOG(GNUNET_ERROR_TYPE_ERROR,
          _("Could not access a pre-bound socket, will try to bind myself\n"));
      for (i = 0; (i < count) && (NULL != sctx->lsocks[i]); i++)
        GNUNET_break(0 == GNUNET_NETWORK_socket_close(sctx->lsocks[i]));
      GNUNET_free_non_null(sctx->lsocks);
      sctx->lsocks = NULL;
      return GNUNET_NO;
    }
  return GNUNET_YES;
}
#endif


/**
 * Setup addr, addrlen, idle_timeout
 * based on configuration!
 *
 * Configuration may specify:
 * - PORT (where to bind to for TCP)
 * - UNIXPATH (where to bind to for UNIX domain sockets)
 * - TIMEOUT (after how many ms does an inactive service timeout);
 * - DISABLEV6 (disable support for IPv6, otherwise we use dual-stack)
 * - BINDTO (hostname or IP address to bind to, otherwise we take everything)
 * - ACCEPT_FROM  (only allow connections from specified IPv4 subnets)
 * - ACCEPT_FROM6 (only allow connections from specified IPv6 subnets)
 * - REJECT_FROM  (disallow allow connections from specified IPv4 subnets)
 * - REJECT_FROM6 (disallow allow connections from specified IPv6 subnets)
 *
 * @param sctx service context to initialize
 * @return #GNUNET_OK if configuration succeeded
 */
static int
setup_service(struct LEGACY_SERVICE_Context *sctx)
{
  struct GNUNET_TIME_Relative idleout;
  int tolerant;

#ifndef MINGW
  const char *nfds;
  unsigned int cnt;
  int flags;
#endif

  if (GNUNET_CONFIGURATION_have_value(sctx->cfg,
                                      sctx->service_name,
                                      "TIMEOUT"))
    {
      if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time(sctx->cfg,
                                                           sctx->service_name,
                                                           "TIMEOUT",
                                                           &idleout))
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Specified value for `%s' of service `%s' is invalid\n"),
              "TIMEOUT",
              sctx->service_name);
          return GNUNET_SYSERR;
        }
      sctx->timeout = idleout;
    }
  else
    sctx->timeout = GNUNET_TIME_UNIT_FOREVER_REL;

  if (GNUNET_CONFIGURATION_have_value(sctx->cfg,
                                      sctx->service_name,
                                      "TOLERANT"))
    {
      if (GNUNET_SYSERR ==
          (tolerant = GNUNET_CONFIGURATION_get_value_yesno(sctx->cfg,
                                                           sctx->service_name,
                                                           "TOLERANT")))
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Specified value for `%s' of service `%s' is invalid\n"),
              "TOLERANT",
              sctx->service_name);
          return GNUNET_SYSERR;
        }
    }
  else
    tolerant = GNUNET_NO;

#ifndef MINGW
  errno = 0;
  if ((NULL != (nfds = getenv("LISTEN_FDS"))) &&
      (1 == sscanf(nfds, "%u", &cnt)) && (cnt > 0) && (cnt < FD_SETSIZE) &&
      (cnt + 4 < FD_SETSIZE))
    {
      sctx->lsocks =
        GNUNET_malloc(sizeof(struct GNUNET_NETWORK_Handle *) * (cnt + 1));
      while (0 < cnt--)
        {
          flags = fcntl(3 + cnt, F_GETFD);
          if ((flags < 0) || (0 != (flags & FD_CLOEXEC)) ||
              (NULL ==
               (sctx->lsocks[cnt] = GNUNET_NETWORK_socket_box_native(3 + cnt))))
            {
              LOG(GNUNET_ERROR_TYPE_ERROR,
                  _(
                    "Could not access pre-bound socket %u, will try to bind myself\n"),
                  (unsigned int)3 + cnt);
              cnt++;
              while (sctx->lsocks[cnt] != NULL)
                GNUNET_break(0 == GNUNET_NETWORK_socket_close(sctx->lsocks[cnt++]));
              GNUNET_free(sctx->lsocks);
              sctx->lsocks = NULL;
              break;
            }
        }
      unsetenv("LISTEN_FDS");
    }
#else
  if (getenv("GNUNET_OS_READ_LSOCKS") != NULL)
    {
      receive_sockets_from_parent(sctx);
      putenv("GNUNET_OS_READ_LSOCKS=");
    }
#endif

  if ((NULL == sctx->lsocks) &&
      (GNUNET_SYSERR == LEGACY_SERVICE_get_server_addresses(sctx->service_name,
                                                            sctx->cfg,
                                                            &sctx->addrs,
                                                            &sctx->addrlens)))
    return GNUNET_SYSERR;
  sctx->require_found = tolerant ? GNUNET_NO : GNUNET_YES;
  sctx->match_uid = GNUNET_CONFIGURATION_get_value_yesno(sctx->cfg,
                                                         sctx->service_name,
                                                         "UNIX_MATCH_UID");
  sctx->match_gid = GNUNET_CONFIGURATION_get_value_yesno(sctx->cfg,
                                                         sctx->service_name,
                                                         "UNIX_MATCH_GID");
  process_acl4(&sctx->v4_denied, sctx, "REJECT_FROM");
  process_acl4(&sctx->v4_allowed, sctx, "ACCEPT_FROM");
  process_acl6(&sctx->v6_denied, sctx, "REJECT_FROM6");
  process_acl6(&sctx->v6_allowed, sctx, "ACCEPT_FROM6");

  return GNUNET_OK;
}


/**
 * Get the name of the user that'll be used
 * to provide the service.
 *
 * @param sctx service context
 * @return value of the 'USERNAME' option
 */
static char *
get_user_name(struct LEGACY_SERVICE_Context *sctx)
{
  char *un;

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename(sctx->cfg,
                                                           sctx->service_name,
                                                           "USERNAME",
                                                           &un))
    return NULL;
  return un;
}


/**
 * Write PID file.
 *
 * @param sctx service context
 * @param pid PID to write (should be equal to 'getpid()'
 * @return  #GNUNET_OK on success (including no work to be done)
 */
static int
write_pid_file(struct LEGACY_SERVICE_Context *sctx, pid_t pid)
{
  FILE *pidfd;
  char *pif;
  char *user;
  char *rdir;
  int len;

  if (NULL == (pif = get_pid_file_name(sctx)))
    return GNUNET_OK; /* no file desired */
  user = get_user_name(sctx);
  rdir = GNUNET_strdup(pif);
  len = strlen(rdir);
  while ((len > 0) && (rdir[len] != DIR_SEPARATOR))
    len--;
  rdir[len] = '\0';
  if (0 != access(rdir, F_OK))
    {
      /* we get to create a directory -- and claim it
       * as ours! */
      (void)GNUNET_DISK_directory_create(rdir);
      if ((NULL != user) && (0 < strlen(user)))
        GNUNET_DISK_file_change_owner(rdir, user);
    }
  if (0 != access(rdir, W_OK | X_OK))
    {
      LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_ERROR, "access", rdir);
      GNUNET_free(rdir);
      GNUNET_free_non_null(user);
      GNUNET_free(pif);
      return GNUNET_SYSERR;
    }
  GNUNET_free(rdir);
  pidfd = fopen(pif, "w");
  if (NULL == pidfd)
    {
      LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_ERROR, "fopen", pif);
      GNUNET_free(pif);
      GNUNET_free_non_null(user);
      return GNUNET_SYSERR;
    }
  if (0 > fprintf(pidfd, "%u", pid))
    LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_WARNING, "fprintf", pif);
  GNUNET_break(0 == fclose(pidfd));
  if ((NULL != user) && (0 < strlen(user)))
    GNUNET_DISK_file_change_owner(pif, user);
  GNUNET_free_non_null(user);
  GNUNET_free(pif);
  return GNUNET_OK;
}


/**
 * Task run during shutdown.  Stops the server/service.
 *
 * @param cls the `struct LEGACY_SERVICE_Context`
 */
static void
shutdown_task(void *cls)
{
  struct LEGACY_SERVICE_Context *service = cls;
  struct GNUNET_SERVER_Handle *server = service->server;

  service->shutdown_task = NULL;
  if (0 != (service->options & LEGACY_SERVICE_OPTION_SOFT_SHUTDOWN))
    GNUNET_SERVER_stop_listening(server);
  else
    GNUNET_SERVER_destroy(server);
}


/**
 * Initial task for the service.
 *
 * @param cls service context
 */
static void
service_task(void *cls)
{
  struct LEGACY_SERVICE_Context *sctx = cls;
  unsigned int i;

  GNUNET_RESOLVER_connect(sctx->cfg);
  if (NULL != sctx->lsocks)
    sctx->server = GNUNET_SERVER_create_with_sockets(&check_access,
                                                     sctx,
                                                     sctx->lsocks,
                                                     sctx->timeout,
                                                     sctx->require_found);
  else
    sctx->server = GNUNET_SERVER_create(&check_access,
                                        sctx,
                                        sctx->addrs,
                                        sctx->addrlens,
                                        sctx->timeout,
                                        sctx->require_found);
  if (NULL == sctx->server)
    {
      if (NULL != sctx->addrs)
        for (i = 0; NULL != sctx->addrs[i]; i++)
          LOG(GNUNET_ERROR_TYPE_INFO,
              _("Failed to start `%s' at `%s'\n"),
              sctx->service_name,
              GNUNET_a2s(sctx->addrs[i], sctx->addrlens[i]));
      sctx->ret = GNUNET_SYSERR;
      return;
    }
#ifndef WINDOWS
  if (NULL != sctx->addrs)
    for (i = 0; NULL != sctx->addrs[i]; i++)
      if ((AF_UNIX == sctx->addrs[i]->sa_family) &&
          ('\0' != ((const struct sockaddr_un *)sctx->addrs[i])->sun_path[0]))
        GNUNET_DISK_fix_permissions(((const struct sockaddr_un *)
                                     sctx->addrs[i])
                                    ->sun_path,
                                    sctx->match_uid,
                                    sctx->match_gid);
#endif


  if (0 == (sctx->options & LEGACY_SERVICE_OPTION_MANUAL_SHUTDOWN))
    {
      /* install a task that will kill the server
       * process if the scheduler ever gets a shutdown signal */
      sctx->shutdown_task = GNUNET_SCHEDULER_add_shutdown(&shutdown_task, sctx);
    }
  sctx->my_handlers = GNUNET_malloc(sizeof(defhandlers));
  GNUNET_memcpy(sctx->my_handlers, defhandlers, sizeof(defhandlers));
  i = 0;
  while (NULL != sctx->my_handlers[i].callback)
    sctx->my_handlers[i++].callback_cls = sctx;
  GNUNET_SERVER_add_handlers(sctx->server, sctx->my_handlers);
  if (-1 != sctx->ready_confirm_fd)
    {
      GNUNET_break(1 == write(sctx->ready_confirm_fd, ".", 1));
      GNUNET_break(0 == close(sctx->ready_confirm_fd));
      sctx->ready_confirm_fd = -1;
      write_pid_file(sctx, getpid());
    }
  if (NULL != sctx->addrs)
    {
      i = 0;
      while (NULL != sctx->addrs[i])
        {
          LOG(GNUNET_ERROR_TYPE_INFO,
              _("Service `%s' runs at %s\n"),
              sctx->service_name,
              GNUNET_a2s(sctx->addrs[i], sctx->addrlens[i]));
          i++;
        }
    }
  sctx->task(sctx->task_cls, sctx->server, sctx->cfg);
}


/**
 * Detach from terminal.
 *
 * @param sctx service context
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
static int
detach_terminal(struct LEGACY_SERVICE_Context *sctx)
{
#ifndef MINGW
  pid_t pid;
  int nullfd;
  int filedes[2];

  if (0 != pipe(filedes))
    {
      LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "pipe");
      return GNUNET_SYSERR;
    }
  pid = fork();
  if (pid < 0)
    {
      LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "fork");
      return GNUNET_SYSERR;
    }
  if (0 != pid)
    {
      /* Parent */
      char c;

      GNUNET_break(0 == close(filedes[1]));
      c = 'X';
      if (1 != read(filedes[0], &c, sizeof(char)))
        LOG_STRERROR(GNUNET_ERROR_TYPE_WARNING, "read");
      fflush(stdout);
      switch (c)
        {
        case '.':
          exit(0);

        case 'I':
          LOG(GNUNET_ERROR_TYPE_INFO,
              _("Service process failed to initialize\n"));
          break;

        case 'S':
          LOG(GNUNET_ERROR_TYPE_INFO,
              _("Service process could not initialize server function\n"));
          break;

        case 'X':
          LOG(GNUNET_ERROR_TYPE_INFO,
              _("Service process failed to report status\n"));
          break;
        }
      exit(1); /* child reported error */
    }
  GNUNET_break(0 == close(0));
  GNUNET_break(0 == close(1));
  GNUNET_break(0 == close(filedes[0]));
  nullfd = open("/dev/null", O_RDWR | O_APPEND);
  if (nullfd < 0)
    return GNUNET_SYSERR;
  /* set stdin/stdout to /dev/null */
  if ((dup2(nullfd, 0) < 0) || (dup2(nullfd, 1) < 0))
    {
      LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "dup2");
      (void)close(nullfd);
      return GNUNET_SYSERR;
    }
  (void)close(nullfd);
  /* Detach from controlling terminal */
  pid = setsid();
  if (-1 == pid)
    LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "setsid");
  sctx->ready_confirm_fd = filedes[1];
#else
  /* FIXME: we probably need to do something else
   * elsewhere in order to fork the process itself... */
  FreeConsole();
#endif
  return GNUNET_OK;
}


/**
 * Set user ID.
 *
 * @param sctx service context
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
static int
set_user_id(struct LEGACY_SERVICE_Context *sctx)
{
  char *user;

  if (NULL == (user = get_user_name(sctx)))
    return GNUNET_OK; /* keep */
#ifndef MINGW
  struct passwd *pws;

  errno = 0;
  pws = getpwnam(user);
  if (NULL == pws)
    {
      LOG(GNUNET_ERROR_TYPE_ERROR,
          _("Cannot obtain information about user `%s': %s\n"),
          user,
          errno == 0 ? _("No such user") : strerror(errno));
      GNUNET_free(user);
      return GNUNET_SYSERR;
    }
  if ((0 != setgid(pws->pw_gid)) || (0 != setegid(pws->pw_gid)) ||
#if HAVE_INITGROUPS
      (0 != initgroups(user, pws->pw_gid)) ||
#endif
      (0 != setuid(pws->pw_uid)) || (0 != seteuid(pws->pw_uid)))
    {
      if ((0 != setregid(pws->pw_gid, pws->pw_gid)) ||
          (0 != setreuid(pws->pw_uid, pws->pw_uid)))
        {
          LOG(GNUNET_ERROR_TYPE_ERROR,
              _("Cannot change user/group to `%s': %s\n"),
              user,
              strerror(errno));
          GNUNET_free(user);
          return GNUNET_SYSERR;
        }
    }
#endif
  GNUNET_free(user);
  return GNUNET_OK;
}


/**
 * Delete the PID file that was created by our parent.
 *
 * @param sctx service context
 */
static void
pid_file_delete(struct LEGACY_SERVICE_Context *sctx)
{
  char *pif = get_pid_file_name(sctx);

  if (NULL == pif)
    return; /* no PID file */
  if (0 != unlink(pif))
    LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_WARNING, "unlink", pif);
  GNUNET_free(pif);
}


/**
 * Run a standard GNUnet service startup sequence (initialize loggers
 * and configuration, parse options).
 *
 * @param argc number of command line arguments
 * @param argv command line arguments
 * @param service_name our service name
 * @param options service options
 * @param task main task of the service
 * @param task_cls closure for @a task
 * @return #GNUNET_SYSERR on error, #GNUNET_OK
 *         if we shutdown nicely
 */
int
LEGACY_SERVICE_run(int argc,
                   char *const *argv,
                   const char *service_name,
                   enum LEGACY_SERVICE_Options options,
                   LEGACY_SERVICE_Main task,
                   void *task_cls)
{
#define HANDLE_ERROR  \
  do                  \
    {                   \
      GNUNET_break(0); \
      goto shutdown;    \
    } while (0)

  int err;
  int ret;
  char *cfg_fn;
  char *opt_cfg_fn;
  char *loglev;
  char *logfile;
  int do_daemonize;
  unsigned int i;
  unsigned long long skew_offset;
  unsigned long long skew_variance;
  long long clock_offset;
  struct LEGACY_SERVICE_Context sctx;
  struct GNUNET_CONFIGURATION_Handle *cfg;
  const char *xdg;

  struct GNUNET_GETOPT_CommandLineOption service_options[] =
  { GNUNET_GETOPT_option_cfgfile(&opt_cfg_fn),
    GNUNET_GETOPT_option_flag('d',
                              "daemonize",
                              gettext_noop(
                                "do daemonize (detach from terminal)"),
                              &do_daemonize),
    GNUNET_GETOPT_option_help(NULL),
    GNUNET_GETOPT_option_loglevel(&loglev),
    GNUNET_GETOPT_option_logfile(&logfile),
    GNUNET_GETOPT_option_version(PACKAGE_VERSION " " VCS_VERSION),
    GNUNET_GETOPT_OPTION_END };
  err = 1;
  do_daemonize = 0;
  logfile = NULL;
  loglev = NULL;
  opt_cfg_fn = NULL;
  xdg = getenv("XDG_CONFIG_HOME");
  if (NULL != xdg)
    GNUNET_asprintf(&cfg_fn,
                    "%s%s%s",
                    xdg,
                    DIR_SEPARATOR_STR,
                    GNUNET_OS_project_data_get()->config_file);
  else
    cfg_fn = GNUNET_strdup(GNUNET_OS_project_data_get()->user_config_file);
  memset(&sctx, 0, sizeof(sctx));
  sctx.options = options;
  sctx.ready_confirm_fd = -1;
  sctx.ret = GNUNET_OK;
  sctx.timeout = GNUNET_TIME_UNIT_FOREVER_REL;
  sctx.task = task;
  sctx.task_cls = task_cls;
  sctx.service_name = service_name;
  sctx.cfg = cfg = GNUNET_CONFIGURATION_create();

  /* setup subsystems */
  ret = GNUNET_GETOPT_run(service_name, service_options, argc, argv);
  if (GNUNET_SYSERR == ret)
    goto shutdown;
  if (GNUNET_NO == ret)
    {
      err = 0;
      goto shutdown;
    }
  if (GNUNET_OK != GNUNET_log_setup(service_name, loglev, logfile))
    HANDLE_ERROR;
  if (NULL == opt_cfg_fn)
    opt_cfg_fn = GNUNET_strdup(cfg_fn);
  if (GNUNET_YES == GNUNET_DISK_file_test(opt_cfg_fn))
    {
      if (GNUNET_SYSERR == GNUNET_CONFIGURATION_load(cfg, opt_cfg_fn))
        {
          GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                     _("Malformed configuration file `%s', exit ...\n"),
                     opt_cfg_fn);
          goto shutdown;
        }
    }
  else
    {
      if (GNUNET_SYSERR == GNUNET_CONFIGURATION_load(cfg, NULL))
        {
          GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                     _("Malformed configuration, exit ...\n"));
          goto shutdown;
        }
      if (0 != strcmp(opt_cfg_fn, cfg_fn))
        GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                   _("Could not access configuration file `%s'\n"),
                   opt_cfg_fn);
    }
  if (GNUNET_OK != setup_service(&sctx))
    goto shutdown;
  if ((1 == do_daemonize) && (GNUNET_OK != detach_terminal(&sctx)))
    HANDLE_ERROR;
  if (GNUNET_OK != set_user_id(&sctx))
    goto shutdown;
  LOG(GNUNET_ERROR_TYPE_DEBUG,
      "Service `%s' runs with configuration from `%s'\n",
      service_name,
      opt_cfg_fn);
  if ((GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(sctx.cfg,
                                                          "TESTING",
                                                          "SKEW_OFFSET",
                                                          &skew_offset)) &&
      (GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(sctx.cfg,
                                                          "TESTING",
                                                          "SKEW_VARIANCE",
                                                          &skew_variance)))
    {
      clock_offset = skew_offset - skew_variance;
      GNUNET_TIME_set_offset(clock_offset);
      LOG(GNUNET_ERROR_TYPE_DEBUG, "Skewing clock by %dll ms\n", clock_offset);
    }
  /* actually run service */
  err = 0;
  GNUNET_SCHEDULER_run(&service_task, &sctx);
  /* shutdown */
  if ((1 == do_daemonize) && (NULL != sctx.server))
    pid_file_delete(&sctx);
  GNUNET_free_non_null(sctx.my_handlers);

shutdown:
  if (-1 != sctx.ready_confirm_fd)
    {
      if (1 != write(sctx.ready_confirm_fd, err ? "I" : "S", 1))
        LOG_STRERROR(GNUNET_ERROR_TYPE_WARNING, "write");
      GNUNET_break(0 == close(sctx.ready_confirm_fd));
    }
#if HAVE_MALLINFO
  {
    char *counter;

    if ((GNUNET_YES == GNUNET_CONFIGURATION_have_value(sctx.cfg,
                                                       service_name,
                                                       "GAUGER_HEAP")) &&
        (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(sctx.cfg,
                                                            service_name,
                                                            "GAUGER_HEAP",
                                                            &counter)))
      {
        struct mallinfo mi;

        mi = mallinfo();
        GAUGER(service_name, counter, mi.usmblks, "blocks");
        GNUNET_free(counter);
      }
  }
#endif
  GNUNET_CONFIGURATION_destroy(cfg);
  i = 0;
  if (NULL != sctx.addrs)
    while (NULL != sctx.addrs[i])
      GNUNET_free(sctx.addrs[i++]);
  GNUNET_free_non_null(sctx.addrs);
  GNUNET_free_non_null(sctx.addrlens);
  GNUNET_free_non_null(logfile);
  GNUNET_free_non_null(loglev);
  GNUNET_free(cfg_fn);
  GNUNET_free_non_null(opt_cfg_fn);
  GNUNET_free_non_null(sctx.v4_denied);
  GNUNET_free_non_null(sctx.v6_denied);
  GNUNET_free_non_null(sctx.v4_allowed);
  GNUNET_free_non_null(sctx.v6_allowed);

  return err ? GNUNET_SYSERR : sctx.ret;
}


/**
 * Run a service startup sequence within an existing
 * initialized system.
 *
 * @param service_name our service name
 * @param cfg configuration to use
 * @param options service options
 * @return NULL on error, service handle
 */
struct LEGACY_SERVICE_Context *
LEGACY_SERVICE_start(const char *service_name,
                     const struct GNUNET_CONFIGURATION_Handle *cfg,
                     enum LEGACY_SERVICE_Options options)
{
  int i;
  struct LEGACY_SERVICE_Context *sctx;

  sctx = GNUNET_new(struct LEGACY_SERVICE_Context);
  sctx->ready_confirm_fd = -1; /* no daemonizing */
  sctx->ret = GNUNET_OK;
  sctx->timeout = GNUNET_TIME_UNIT_FOREVER_REL;
  sctx->service_name = service_name;
  sctx->cfg = cfg;
  sctx->options = options;

  /* setup subsystems */
  if (GNUNET_OK != setup_service(sctx))
    {
      LEGACY_SERVICE_stop(sctx);
      return NULL;
    }
  if (NULL != sctx->lsocks)
    sctx->server = GNUNET_SERVER_create_with_sockets(&check_access,
                                                     sctx,
                                                     sctx->lsocks,
                                                     sctx->timeout,
                                                     sctx->require_found);
  else
    sctx->server = GNUNET_SERVER_create(&check_access,
                                        sctx,
                                        sctx->addrs,
                                        sctx->addrlens,
                                        sctx->timeout,
                                        sctx->require_found);

  if (NULL == sctx->server)
    {
      LEGACY_SERVICE_stop(sctx);
      return NULL;
    }
#ifndef WINDOWS
  if (NULL != sctx->addrs)
    for (i = 0; NULL != sctx->addrs[i]; i++)
      if ((AF_UNIX == sctx->addrs[i]->sa_family) &&
          ('\0' != ((const struct sockaddr_un *)sctx->addrs[i])->sun_path[0]))
        GNUNET_DISK_fix_permissions(((const struct sockaddr_un *)
                                     sctx->addrs[i])
                                    ->sun_path,
                                    sctx->match_uid,
                                    sctx->match_gid);
#endif
  sctx->my_handlers = GNUNET_malloc(sizeof(defhandlers));
  GNUNET_memcpy(sctx->my_handlers, defhandlers, sizeof(defhandlers));
  i = 0;
  while ((sctx->my_handlers[i].callback != NULL))
    sctx->my_handlers[i++].callback_cls = sctx;
  GNUNET_SERVER_add_handlers(sctx->server, sctx->my_handlers);
  return sctx;
}


/**
 * Obtain the server used by a service.  Note that the server must NOT
 * be destroyed by the caller.
 *
 * @param ctx the service context returned from the start function
 * @return handle to the server for this service, NULL if there is none
 */
struct GNUNET_SERVER_Handle *
LEGACY_SERVICE_get_server(struct LEGACY_SERVICE_Context *ctx)
{
  return ctx->server;
}


/**
 * Get the NULL-terminated array of listen sockets for this service.
 *
 * @param ctx service context to query
 * @return NULL if there are no listen sockets, otherwise NULL-terminated
 *              array of listen sockets.
 */
struct GNUNET_NETWORK_Handle *const *
LEGACY_SERVICE_get_listen_sockets(struct LEGACY_SERVICE_Context *ctx)
{
  return ctx->lsocks;
}


/**
 * Stop a service that was started with "LEGACY_SERVICE_start".
 *
 * @param sctx the service context returned from the start function
 */
void
LEGACY_SERVICE_stop(struct LEGACY_SERVICE_Context *sctx)
{
  unsigned int i;

#if HAVE_MALLINFO
  {
    char *counter;

    if ((GNUNET_YES == GNUNET_CONFIGURATION_have_value(sctx->cfg,
                                                       sctx->service_name,
                                                       "GAUGER_HEAP")) &&
        (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(sctx->cfg,
                                                            sctx->service_name,
                                                            "GAUGER_HEAP",
                                                            &counter)))
      {
        struct mallinfo mi;

        mi = mallinfo();
        GAUGER(sctx->service_name, counter, mi.usmblks, "blocks");
        GNUNET_free(counter);
      }
  }
#endif
  if (NULL != sctx->shutdown_task)
    {
      GNUNET_SCHEDULER_cancel(sctx->shutdown_task);
      sctx->shutdown_task = NULL;
    }
  if (NULL != sctx->server)
    GNUNET_SERVER_destroy(sctx->server);
  GNUNET_free_non_null(sctx->my_handlers);
  if (NULL != sctx->addrs)
    {
      i = 0;
      while (NULL != sctx->addrs[i])
        GNUNET_free(sctx->addrs[i++]);
      GNUNET_free(sctx->addrs);
    }
  GNUNET_free_non_null(sctx->addrlens);
  GNUNET_free_non_null(sctx->v4_denied);
  GNUNET_free_non_null(sctx->v6_denied);
  GNUNET_free_non_null(sctx->v4_allowed);
  GNUNET_free_non_null(sctx->v6_allowed);
  GNUNET_free(sctx);
}


/* end of service.c */