tcp_service_legacy.c

Go to the documentation of this file.

/*
     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
 */
 
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_constants.h"
#include "gnunet_resolver_service.h"
 
#if HAVE_MALLINFO2
#include <malloc.h>
#include "gauger.h"
#endif
 
 
/* ******************* access control ******************** */
 
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;
}
 
 
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 ****************** */
 
 
struct LEGACY_SERVICE_Context
{
  const struct GNUNET_CONFIGURATION_Handle *cfg;
 
  struct GNUNET_SERVER_Handle *server;
 
  struct sockaddr **addrs;
 
  const char *service_name;
 
  LEGACY_SERVICE_Main task;
 
  void *task_cls;
 
  struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_denied;
 
  struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_denied;
 
  struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_allowed;
 
  struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_allowed;
 
  struct GNUNET_SERVER_MessageHandler *my_handlers;
 
  socklen_t *addrlens;
 
  struct GNUNET_NETWORK_Handle **lsocks;
 
  struct GNUNET_SCHEDULER_Task *shutdown_task;
 
  struct GNUNET_TIME_Relative timeout;
 
  int ret;
 
  int ready_confirm_fd;
 
  int require_found;
 
  int match_uid;
 
  int match_gid;
 
  enum LEGACY_SERVICE_Options options;
};
 
 
/* ****************** message handlers ****************** */
 
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);
}
 
 
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);
}
 
 
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 ************** */
 
 
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;
 
  case AF_UNIX:
    ret = GNUNET_OK;   /* controlled using file-system ACL now */
    break;
 
  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;
}
 
 
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;
}
 
 
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;
}
 
 
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;
}
 
 
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
}
 
 
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 (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 (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 (unixpath);
    GNUNET_free (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 (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 (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 (unixpath);
  *addrs = saddrs;
  *addr_lens = saddrlens;
  return resi;
}
 
 
static int
setup_service (struct LEGACY_SERVICE_Context *sctx)
{
  struct GNUNET_TIME_Relative idleout;
  int tolerant;
  const char *nfds;
  unsigned int cnt;
  int flags;
 
  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;
 
  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");
  }
 
  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;
}
 
 
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;
}
 
 
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 (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 (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 (user);
  GNUNET_free (pif);
  return GNUNET_OK;
}
 
 
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);
}
 
 
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;
  }
 
  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);
 
  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);
}
 
 
static int
detach_terminal (struct LEGACY_SERVICE_Context *sctx)
{
  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];
 
  return GNUNET_OK;
}
 
 
static int
set_user_id (struct LEGACY_SERVICE_Context *sctx)
{
  char *user;
 
  if (NULL == (user = get_user_name (sctx)))
    return GNUNET_OK; /* keep */
 
  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;
    }
  }
 
  GNUNET_free (user);
  return GNUNET_OK;
}
 
 
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);
}
 
 
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 %lld 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 (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_MALLINFO2
  {
    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 mallinfo2 mi;
 
      mi = mallinfo2 ();
      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_nz (sctx.addrs[i++]);
  GNUNET_free (sctx.addrs);
  GNUNET_free (sctx.addrlens);
  GNUNET_free (logfile);
  GNUNET_free (loglev);
  GNUNET_free (cfg_fn);
  GNUNET_free (opt_cfg_fn);
  GNUNET_free (sctx.v4_denied);
  GNUNET_free (sctx.v6_denied);
  GNUNET_free (sctx.v4_allowed);
  GNUNET_free (sctx.v6_allowed);
 
  return err ? GNUNET_SYSERR : sctx.ret;
}
 
 
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;
  }
 
  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);
 
  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;
}
 
 
struct GNUNET_SERVER_Handle *
LEGACY_SERVICE_get_server (struct LEGACY_SERVICE_Context *ctx)
{
  return ctx->server;
}
 
 
struct GNUNET_NETWORK_Handle *const *
LEGACY_SERVICE_get_listen_sockets (struct LEGACY_SERVICE_Context *ctx)
{
  return ctx->lsocks;
}
 
 
void
LEGACY_SERVICE_stop (struct LEGACY_SERVICE_Context *sctx)
{
  unsigned int i;
 
#if HAVE_MALLINFO2
  {
    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 mallinfo2 mi;
 
      mi = mallinfo2 ();
      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 (sctx->my_handlers);
  if (NULL != sctx->addrs)
  {
    i = 0;
    while (NULL != sctx->addrs[i])
      GNUNET_free_nz (sctx->addrs[i++]);
    GNUNET_free (sctx->addrs);
  }
  GNUNET_free (sctx->addrlens);
  GNUNET_free (sctx->v4_denied);
  GNUNET_free (sctx->v6_denied);
  GNUNET_free (sctx->v4_allowed);
  GNUNET_free (sctx->v6_allowed);
  GNUNET_free (sctx);
}
 
 
/* end of service.c */