/src/pigeonhole/src/lib-sieve/sieve-storage.c

Source
/* Copyright (c) Pigeonhole authors, see top-level COPYING file */

#include "lib.h"
#include "array.h"
#include "str.h"
#include "str-sanitize.h"
#include "hash.h"
#include "home-expand.h"
#include "eacces-error.h"
#include "mkdir-parents.h"
#include "ioloop.h"
#include "settings.h"
#include "settings-consts.h"

#include "sieve-common.h"
#include "sieve-error-private.h"

#include "sieve-script-private.h"
#include "sieve-storage-private.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <time.h>
#include <utime.h>

struct event_category event_category_sieve_storage = {
  .parent = &event_category_sieve,
  .name = "sieve-storage",
};

/*
 * Storage name
 */

bool sieve_storage_name_is_valid(const char *name)
{
  return sieve_script_name_is_valid(name);
}

/*
 * Storage class
 */

struct sieve_storage_class_registry {
  ARRAY_TYPE(sieve_storage_class) storage_classes;
};

void sieve_storages_init(struct sieve_instance *svinst)
{
  svinst->storage_reg = p_new(svinst->pool,
            struct sieve_storage_class_registry, 1);
  p_array_init(&svinst->storage_reg->storage_classes, svinst->pool, 8);

  sieve_storage_class_register(svinst, &sieve_file_storage);
  sieve_storage_class_register(svinst, &sieve_dict_storage);
#if defined(SIEVE_BUILTIN_LDAP) || defined(PLUGIN_BUILD)
  sieve_storage_class_register(svinst, &sieve_ldap_storage);
#endif
}

void sieve_storages_deinit(struct sieve_instance *svinst ATTR_UNUSED)
{
  /* nothing yet */
}

void sieve_storage_class_register(struct sieve_instance *svinst,
          const struct sieve_storage *storage_class)
{
  struct sieve_storage_class_registry *reg = svinst->storage_reg;
  const struct sieve_storage *old_class;

  old_class = sieve_storage_class_find(svinst,
               storage_class->driver_name);
  if (old_class != NULL) {
    if (old_class->v.alloc == NULL) {
      /* replacing a "support not compiled in" storage class
       */
      sieve_storage_class_unregister(svinst, old_class);
    } else {
      i_panic("sieve_storage_class_register(%s): "
        "Already registered",
        storage_class->driver_name);
    }
  }

  array_append(&reg->storage_classes, &storage_class, 1);
}

void sieve_storage_class_unregister(struct sieve_instance *svinst,
            const struct sieve_storage *storage_class)
{
  struct sieve_storage_class_registry *reg = svinst->storage_reg;
  const struct sieve_storage *const *classes;
  unsigned int i, count;

  classes = array_get(&reg->storage_classes, &count);
  for (i = 0; i < count; i++) {
    if (classes[i] == storage_class) {
      array_delete(&reg->storage_classes, i, 1);
      break;
    }
  }
}

const struct sieve_storage *
sieve_storage_class_find(struct sieve_instance *svinst, const char *name)
{
  struct sieve_storage_class_registry *reg = svinst->storage_reg;
  const struct sieve_storage *const *classes;
  unsigned int i, count;

  i_assert(name != NULL);

  classes = array_get(&reg->storage_classes, &count);
  for (i = 0; i < count; i++) {
    if (strcasecmp(classes[i]->driver_name, name) == 0)
      return classes[i];
  }
  return NULL;
}

bool sieve_storage_class_exists(struct sieve_instance *svinst,
        const char *name)
{
  return (sieve_storage_class_find(svinst, name) != NULL);
}

/*
 * Storage event
 */

static void
sieve_storage_update_event_prefix(struct event *event, const char *storage_name,
          bool is_default)
{
  string_t *prefix = t_str_new(128);

  str_append(prefix, "storage");
  if (storage_name != NULL && *storage_name != '\0') {
    str_append_c(prefix, ' ');
    str_append(prefix, storage_name);
  }
  if (is_default)
    str_append(prefix, " (default)");
  str_append(prefix, ": ");
  event_set_append_log_prefix(event, str_c(prefix));
}

static struct event *
sieve_storage_create_event(struct sieve_instance *svinst,
         struct event *event_parent,
         const char *storage_name)
{
  struct event *event;

  event = event_create(event_parent == NULL ?
           svinst->event : event_parent);
  if (event_parent != svinst->event)
    event_add_category(event, &event_category_sieve);
  event_add_category(event, &event_category_sieve_storage);

  sieve_storage_update_event_prefix(event, storage_name, FALSE);
  return event;
}

static struct event *
sieve_storage_create_driver_event(struct event *event_parent,
          const char *driver_name)
{
  struct event *event;

  event = event_create(event_parent);
  event_add_str(event, "driver", driver_name);
  event_set_append_log_prefix(event,
    t_strdup_printf("%s: ", driver_name));

  return event;
}

/*
 * Storage instance
 */

static int
sieve_storage_alloc_from_class(struct sieve_instance *svinst,
             struct event *event,
             const struct sieve_storage *storage_class,
             const char *cause, const char *script_type,
             const char *storage_name,
             const char *script_name,
             enum sieve_storage_flags flags,
             struct sieve_storage **storage_r,
             enum sieve_error *error_code_r,
             const char **error_r)
{
  struct sieve_storage *storage;

  i_assert(svinst->username != NULL);

  if (storage_class->v.alloc == NULL) {
    e_error(event, "Support not compiled in for this driver");
    sieve_error_create_script_not_found(
      script_name, error_code_r, error_r);
    return -1;
  }

  if ((flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0 &&
      !storage_class->allows_synchronization) {
    e_error(event, "Storage does not support synchronization");
    sieve_error_create_internal(error_code_r, error_r);
    return -1;
  }
  if ((flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 &&
      storage_class->v.save_init == NULL) {
    e_error(event, "Storage does not support write access");
    sieve_error_create_internal(error_code_r, error_r);
    return -1;
  }

  storage = storage_class->v.alloc();
  storage->storage_class = storage_class;
  storage->refcount = 1;
  storage->svinst = svinst;
  storage->cause = p_strdup(storage->pool, cause);
  storage->type = p_strdup(storage->pool, script_type);
  storage->script_name = p_strdup(storage->pool, script_name);
  storage->flags = flags;

  if (storage_name != NULL && *storage_name != '\0')
    storage->name = p_strdup(storage->pool, storage_name);
  else {
    storage->name = p_strconcat(
      storage->pool, "auto:", storage->type, NULL);
  }

  if (strcasecmp(script_type, SIEVE_STORAGE_TYPE_PERSONAL) == 0)
    storage->is_personal = TRUE;

  storage->event = event;
  event_ref(event);

  *storage_r = storage;
  return 0;
}

int sieve_storage_alloc(struct sieve_instance *svinst,
      struct event *event_parent,
      const struct sieve_storage *storage_class,
      const char *cause, const char *script_type,
      const char *storage_name, const char *script_name,
      enum sieve_storage_flags flags,
      struct sieve_storage **storage_r,
      enum sieve_error *error_code_r, const char **error_r)
{
  struct event *storage_event, *event;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  storage_event = sieve_storage_create_event(svinst, event_parent,
               storage_name);
  event = sieve_storage_create_driver_event(storage_event,
              storage_class->driver_name);
  event_unref(&storage_event);

  ret = sieve_storage_alloc_from_class(svinst, event, storage_class,
               cause, script_type,
               storage_name, script_name, flags,
               storage_r, error_code_r, error_r);

  event_unref(&event);

  return ret;
}

int sieve_storage_alloc_with_settings(struct sieve_instance *svinst,
              struct event *event_parent,
              const struct sieve_storage *storage_class,
              const char *cause,
              const struct sieve_storage_settings *set,
              enum sieve_storage_flags flags,
              struct sieve_storage **storage_r,
              enum sieve_error *error_code_r,
              const char **error_r)
{
  struct sieve_storage *storage;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  ret = sieve_storage_alloc_from_class(svinst, event_parent,
               storage_class,
               cause, set->script_type,
               set->script_storage,
               set->script_name, flags,
               &storage, error_code_r, error_r);
  if (ret < 0)
    return -1;

  const char *bin_path = set->script_bin_path;

  if (sieve_storage_get_full_path(storage, bin_path, &bin_path) < 0) {
    sieve_storage_set_critical(
      storage,
      "Binary storage path '%s' is relative to home directory, "
      "but home directory is not available.", bin_path);
    return -1;
  }

  storage->bin_path = p_strdup_empty(storage->pool, bin_path);
  storage->max_storage = set->quota_storage_size;
  storage->max_scripts = set->quota_script_count;

  if (storage->bin_path != NULL) {
    e_debug(storage->event, "Directory for binaries: %s",
      storage->bin_path);
  }
  if (storage->max_storage != SET_SIZE_UNLIMITED) {
    e_debug(storage->event, "quota: "
      "Storage limit: %"PRIuUOFF_T" bytes",
      storage->max_storage);
  }
  if (storage->max_scripts != SET_UINT_UNLIMITED) {
    e_debug(storage->event, "quota: "
      "Script count limit: %u scripts",
      storage->max_scripts);
  }

  *storage_r = storage;
  return 0;
}

static int
sieve_storage_alloc_from_settings(struct sieve_instance *svinst,
          struct event *event_parent, const char *cause,
          const struct sieve_storage_settings *set,
          enum sieve_storage_flags flags,
          struct sieve_storage **storage_r,
          enum sieve_error *error_code_r,
          const char **error_r)
{
  const struct sieve_storage *storage_class;
  struct event *event = event_parent;
  int ret;

  *storage_r = NULL;

  if (!sieve_storage_settings_match_script_cause(set, cause))
    return 0;

  storage_class = sieve_storage_class_find(svinst, set->script_driver);
  // FIXME: add support for automatic module loading (no such modules yet)
  if (storage_class == NULL) {
    e_error(event, "Unknown storage driver: %s",
      set->script_driver);
    sieve_error_create_script_not_found(set->script_name,
                error_code_r, error_r);
    event_unref(&event);
    return -1;
  }

  event = sieve_storage_create_driver_event(event_parent,
              storage_class->driver_name);

  ret = sieve_storage_alloc_with_settings(svinst, event, storage_class,
            cause, set, flags,
            storage_r, error_code_r,
            error_r);

  event_unref(&event);

  if (ret < 0)
    return -1;
  return 1;
}

static int
sieve_storage_autodetect(struct sieve_instance *svinst, struct event *event,
       const char *cause, const char *type,
       const struct sieve_storage_settings *set,
       enum sieve_storage_flags flags,
       struct sieve_storage **storage_r,
       enum sieve_error *error_code_r, const char **error_r)
{
  struct sieve_storage_class_registry *reg = svinst->storage_reg;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  if (!sieve_storage_settings_match_script_cause(set, cause))
    return 0;
  if (!sieve_storage_settings_match_script_type(set, type))
    return 0;

  const struct sieve_storage *const *classes;
  unsigned int i, count;

  classes = array_get(&reg->storage_classes, &count);
  ret = 0;
  for (i = 0; i < count; i++) {
    if (classes[i]->v.autodetect == NULL)
      continue;
    if (set->script_driver[0] != '\0' &&
        strcasecmp(set->script_driver,
             classes[i]->driver_name) != 0)
      continue;

    struct event *driver_event =
      sieve_storage_create_driver_event(
        event, classes[i]->driver_name);

    *storage_r = NULL;
    ret = classes[i]->v.autodetect(svinst, driver_event,
                 cause, set, flags,
                 storage_r, error_code_r,
                 error_r);

    event_unref(&driver_event);

    if (ret < 0) {
      i_assert(*error_code_r != SIEVE_ERROR_NONE);
      i_assert(*error_r != NULL);
      if (*error_code_r == SIEVE_ERROR_NOT_FOUND) {
        *error_code_r = SIEVE_ERROR_NONE;
        *error_r = NULL;
        ret = 0;
      }
    }
    i_assert(ret <= 0 || *storage_r != NULL);
    if (ret != 0)
      break;
  }

  if (ret == 0)
    e_debug(event, "Autodetection failed");
  return ret;
}

static int
sieve_storage_autodetect_any(struct sieve_instance *svinst,
           struct event *event_parent,
           const char *cause, const char *type,
           const struct sieve_storage_settings *set,
           enum sieve_storage_flags flags,
           struct sieve_storage **storage_r,
           enum sieve_error *error_code_r,
           const char **error_r)
{
  struct event *event;
  int ret;

  event = sieve_storage_create_event(svinst, event_parent, NULL);

  ret = sieve_storage_autodetect(svinst, event, cause, type, set,
               flags, storage_r, error_code_r, error_r);

  event_unref(&event);
  return ret;
}

static int
sieve_storage_init_real(struct sieve_instance *svinst, struct event *event,
      const char *cause, const char *type,
      const char *storage_name, bool try,
      enum sieve_storage_flags flags,
      struct sieve_storage **storage_r,
      enum sieve_error *error_code_r, const char **error_r)
{
  const struct sieve_storage_settings *set;
  struct sieve_storage *storage;
  const char *error;
  int ret;

  if (try) {
    ret = settings_try_get_filter(
      event, "sieve_script", storage_name,
      &sieve_storage_setting_parser_info, 0,
      &set, &error);
    if (ret == 0)
      return 0;
  } else {
    ret = settings_get_filter(
      event, "sieve_script", storage_name,
      &sieve_storage_setting_parser_info, 0,
      &set, &error);
  }
  if (ret < 0) {
    e_error(event, "%s", error);
    sieve_error_create_internal(error_code_r, error_r);
    return -1;
  }

  if (!sieve_storage_settings_match_script_type(set, type)) {
    settings_free(set);
    return 0;
  }

  event_add_str(event, "sieve_script", storage_name);
  settings_event_add_list_filter_name(event, "sieve_script",
              storage_name);

  if (set->script_driver[0] == '\0') {
    ret = sieve_storage_autodetect(svinst, event, cause, type,
                 set, flags, storage_r,
                 error_code_r, error_r);
    if (ret != 0) {
      settings_free(set);
      return ret;
    }
    e_error(event, "sieve_script_driver is empty");
    sieve_error_create_script_not_found(set->script_name,
                error_code_r, error_r);
    settings_free(set);
    return -1;
  }

  ret = sieve_storage_alloc_from_settings(svinst, event, cause,
            set, flags, &storage,
            error_code_r, error_r);
  settings_free(set);
  if (ret <= 0)
    return ret;
  i_assert(storage != NULL);
  i_assert(storage->v.init != NULL);

  T_BEGIN {
    ret = storage->v.init(storage);
    i_assert(ret <= 0);
  } T_END;
  if (ret < 0) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);
    *error_code_r = storage->error_code;
    *error_r = t_strdup(storage->error);
    sieve_storage_unref(&storage);
    return -1;
  }
  *storage_r = storage;
  return 1;
}

static int
sieve_storage_init(struct sieve_instance *svinst, struct event *event_parent,
       const char *cause, const char *type,
       const char *storage_name, bool try,
       enum sieve_storage_flags flags,
       struct sieve_storage **storage_r,
       enum sieve_error *error_code_r, const char **error_r)
{
  struct event *event;
  int ret;

  *storage_r = NULL;

  event = sieve_storage_create_event(svinst, event_parent, storage_name);

  ret = sieve_storage_init_real(svinst, event, cause, type,
              storage_name, try, flags,
              storage_r, error_code_r, error_r);

  event_unref(&event);

  return ret;
}

int sieve_storage_create(struct sieve_instance *svinst,
       struct event *event, const char *cause,
       const char *storage_name,
       enum sieve_storage_flags flags,
       struct sieve_storage **storage_r,
       enum sieve_error *error_code_r, const char **error_r)
{
  struct sieve_storage *storage;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  ret = sieve_storage_init(svinst, event, cause, SIEVE_STORAGE_TYPE_ANY,
         storage_name, TRUE, flags,
         &storage, error_code_r, error_r);
  if (ret < 0) {
    if (*error_code_r != SIEVE_ERROR_NOT_FOUND)
      return -1;
    ret = 0;
  }
  if (ret == 0) {
    e_debug(event, "Sieve script storage '%s' not found (cause=%s)",
      storage_name, cause);
    sieve_error_create_script_not_found(
      NULL, error_code_r, error_r);
    return -1;
  }
  i_assert(storage != NULL);
  *storage_r = storage;
  return 0;
}

int sieve_storage_create_auto(struct sieve_instance *svinst,
            struct event *event,
            const char *cause, const char *type,
            enum sieve_storage_flags flags,
            struct sieve_storage **storage_r,
            enum sieve_error *error_code_r,
            const char **error_r)
{
  const struct sieve_storage_settings *storage_set;
  const char *const *storage_names;
  unsigned int i, count;
  const char *error;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  if (settings_get(event, &sieve_storage_setting_parser_info,
       SETTINGS_GET_FLAG_SORT_FILTER_ARRAYS,
       &storage_set, &error) < 0) {
    e_error(event, "%s", error);
    sieve_error_create_internal(error_code_r, error_r);
    return -1;
  }
  if (array_is_created(&storage_set->storages))
    storage_names = array_get(&storage_set->storages, &count);
  else {
    storage_names = NULL;
    count = 0;
  }

  struct sieve_storage *storage = NULL;
  int ret = 0;

  for (i = 0; i < count; i++) {
    ret = sieve_storage_init(svinst, event, cause, type,
           storage_names[i], FALSE, flags,
           &storage, error_code_r, error_r);
    if (ret < 0 && *error_code_r != SIEVE_ERROR_NOT_FOUND) {
      settings_free(storage_set);
      return -1;
    }
    if (ret > 0) {
      i_assert(storage != NULL);
      break;
    }
  }
  if (ret <= 0) {
    ret = sieve_storage_autodetect_any(svinst, event, cause, type,
               storage_set, flags, &storage,
               error_code_r, error_r);
    if (ret < 0) {
      settings_free(storage_set);
      return -1;
    }
  }
  settings_free(storage_set);
  if (ret <= 0) {
    e_debug(event,
      "storage: No matching Sieve storage configured "
      "(type=%s and cause=%s)",
      type, cause);
    sieve_error_create_script_not_found(
      NULL, error_code_r, error_r);
    return -1;
  }
  i_assert(storage != NULL);
  *storage_r = storage;
  return 0;
}

static int
sieve_storage_create_default(struct sieve_instance *svinst,
           struct event *event, const char *cause,
           enum sieve_storage_flags flags,
           struct sieve_storage **storage_r,
           enum sieve_error *error_code_r,
           const char **error_r)
{
  struct sieve_storage *storage;
  enum sieve_error error_code;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  ret = sieve_storage_create_auto(svinst, event, cause,
          SIEVE_STORAGE_TYPE_DEFAULT, flags,
          &storage, &error_code, error_r);
  if (ret >= 0) {
    storage->is_default = TRUE;
    sieve_storage_update_event_prefix(
      event_get_parent(storage->event), storage->name, TRUE);
  } else {
    switch (error_code) {
    case SIEVE_ERROR_NOT_FOUND:
      e_debug(event, "storage: "
        "Default script not found");
      break;
    case SIEVE_ERROR_TEMP_FAILURE:
      e_error(event, "storage: "
        "Failed to access default script "
        "(temporary failure)");
      break;
    default:
      e_error(event, "storage: "
        "Failed to access default script");
      break;
    }
    *error_code_r = error_code;
  }

  *storage_r = storage;
  return ret;
}

static int
sieve_storage_create_default_for(struct sieve_storage *storage,
         struct sieve_storage **storage_r,
         enum sieve_error *error_code_r,
         const char **error_r)
{
  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  if (storage->default_storage != NULL) {
    sieve_storage_ref(storage->default_storage);
    *storage_r = storage->default_storage;
    return 0;
  }

  struct sieve_instance *svinst = storage->svinst;
  enum sieve_error error_code;
  const char *error;

  i_assert(storage->default_storage_for == NULL);
  if (sieve_storage_create_default(svinst, svinst->event,
           storage->cause, 0,
           &storage->default_storage,
           &error_code, &error) < 0) {
    sieve_storage_set_error(storage, error_code, "%s", error);
    *error_code_r = storage->error_code;
    *error_r = storage->error;
    return -1;
  }

  storage->default_storage->default_storage_for = storage;
  sieve_storage_ref(storage);

  *storage_r = storage->default_storage;
  return 0;
}

int sieve_storage_create_personal(struct sieve_instance *svinst,
          struct mail_user *user, const char *cause,
          enum sieve_storage_flags flags,
          struct sieve_storage **storage_r,
          enum sieve_error *error_code_r)
{
  struct sieve_storage *storage;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, NULL);

  /* Check whether Sieve is disabled for this user */
  if (!svinst->set->enabled) {
    e_debug(svinst->event,
      "Sieve is disabled for this user");
    *error_code_r = SIEVE_ERROR_NOT_POSSIBLE;
    return -1;
  }

  /* Attempt to locate user's main storage */
  ret = sieve_storage_create_auto(svinst, svinst->event, cause,
          SIEVE_STORAGE_TYPE_PERSONAL, flags,
          &storage, error_code_r, NULL);
  if (ret == 0) {
    i_assert(storage->is_personal);
    (void)sieve_storage_sync_init(storage, user);
  } else if (*error_code_r != SIEVE_ERROR_TEMP_FAILURE &&
       (flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 &&
       (flags & SIEVE_STORAGE_FLAG_READWRITE) == 0) {

    /* Failed; try using default script location
       (not for temporary failures, read/write access, or dsync) */
    ret = sieve_storage_create_default(svinst, svinst->event,
               cause, flags, &storage,
               error_code_r, NULL);
  }
  *storage_r = storage;
  return ret;
}

void sieve_storage_ref(struct sieve_storage *storage)
{
  storage->refcount++;
}

void sieve_storage_unref(struct sieve_storage **_storage)
{
  struct sieve_storage *storage = *_storage;

  if (storage == NULL)
    return;
  *_storage = NULL;

  i_assert(storage->refcount > 0);
  if (--storage->refcount != 0)
    return;

  if (storage->default_storage_for != NULL) {
    i_assert(storage->is_default);
    storage->default_storage_for->default_storage = NULL;
    sieve_storage_unref(&storage->default_storage_for);
  }

  sieve_storage_sync_deinit(storage);

  if (storage->v.destroy != NULL)
    storage->v.destroy(storage);

  i_free(storage->error);
  event_unref(&storage->event);
  pool_unref(&storage->pool);
}

/*
 * Utility
 */

int sieve_storage_get_full_path(struct sieve_storage *storage,
        const char *path, const char **path_r)
{
  struct sieve_instance *svinst = storage->svinst;

  *path_r = path;

  if (path == NULL || *path == '\0')
    return 0;
  if ((path[0] != '~' || (path[1] != '/' && path[1] != '\0')) &&
      ((svinst->flags & SIEVE_FLAG_HOME_RELATIVE) == 0 ||
       path[0] == '/'))
    return 0;

  /* Home-relative path. change to absolute. */
  const char *home = sieve_environment_get_homedir(svinst);

  if (home == NULL)
    return -1;

  if (path[0] == '~' && (path[1] == '/' || path[1] == '\0'))
    *path_r = home_expand_tilde(path, home);
  else
    *path_r = t_strconcat(home, "/", path, NULL);
  return 0;
}

/*
 * Binary
 */

int sieve_storage_setup_bin_path(struct sieve_storage *storage, mode_t mode)
{
  const char *bin_path = storage->bin_path;
  struct stat st;

  if (bin_path == NULL) {
    sieve_storage_set_critical(
      storage, "script_bin_path not configured for storage");
    return -1;
  }

  if (stat(bin_path, &st) == 0) {
    e_debug(storage->event,
      "Directory for saving binary already exists");
    return 0;
  }

  if (errno == EACCES) {
    sieve_storage_set_critical(storage,
      "Failed to setup directory for binaries: "
      "%s", eacces_error_get("stat", bin_path));
    return -1;
  } else if (errno != ENOENT) {
    sieve_storage_set_critical(storage,
      "Failed to setup directory for binaries: "
      "stat(%s) failed: %m",
      bin_path);
    return -1;
  }

  if (mkdir_parents(bin_path, mode) == 0) {
    e_debug(storage->event,
      "Created directory for binaries: %s", bin_path);
    return 1;
  }

  switch (errno) {
  case EEXIST:
    return 0;
  case ENOENT:
    sieve_storage_set_critical(storage,
      "Directory for binaries was deleted while it was being created");
    break;
  case EACCES:
    sieve_storage_set_critical(storage,
      "%s", eacces_error_get_creating("mkdir_parents_chgrp",
              bin_path));
    break;
  default:
    sieve_storage_set_critical(storage,
      "mkdir_parents_chgrp(%s) failed: %m", bin_path);
    break;
  }

  return -1;
}

/*
 * Properties
 */

int sieve_storage_is_singular(struct sieve_storage *storage)
{
  if (storage->v.is_singular == NULL)
    return 1;
  return storage->v.is_singular(storage);
}

int sieve_storage_get_last_change(struct sieve_storage *storage,
          time_t *last_change_r)
{
  i_assert(storage->v.get_last_change != NULL);
  return storage->v.get_last_change(storage, last_change_r);
}

void sieve_storage_set_modified(struct sieve_storage *storage, time_t mtime)
{
  if (storage->v.set_modified == NULL)
    return;

  storage->v.set_modified(storage, mtime);
}

/*
 * Comparison
 */

int sieve_storage_cmp(const struct sieve_storage *storage1,
          const struct sieve_storage *storage2)
{
  int ret;

  if (storage1 == storage2)
    return 0;
  if (storage1 == NULL || storage2 == NULL)
    return (storage1 == NULL ? -1 : 1);
  if (storage1->storage_class != storage2->storage_class) {
    return (storage1->storage_class > storage2->storage_class ?
      1 : -1);
  }
  ret = null_strcmp(storage1->type, storage2->type);
  if (ret != 0)
    return (ret > 0 ? 1 : -1);
  return null_strcmp(storage1->name, storage2->name);
}

unsigned int sieve_storage_hash(const struct sieve_storage *storage)
{
  unsigned int hash = 0;

  hash ^= POINTER_CAST_TO(storage->storage_class, unsigned int);
  hash ^= str_hash(storage->type);
  hash ^= str_hash(storage->name);

  return hash;
}

/*
 * Script access
 */

int sieve_storage_get_script_direct(struct sieve_storage *storage,
            const char *name,
            struct sieve_script **script_r,
            enum sieve_error *error_code_r)
{
  int ret;

  /* Validate script name */
  if (name != NULL && !sieve_script_name_is_valid(name)) {
    sieve_storage_set_error(storage,
      SIEVE_ERROR_BAD_PARAMS,
      "Invalid script name '%s'.",
      str_sanitize(name, 80));
    *error_code_r = storage->error_code;
    return -1;
  }
  if (name == NULL)
    name = storage->script_name;

  i_assert(storage->v.get_script != NULL);
  ret = storage->v.get_script(storage, name, script_r);
  i_assert(ret <= 0);
  if (ret < 0) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);
    *error_code_r = storage->error_code;
  }
  return ret;
}

static int
sieve_storage_get_default_script(struct sieve_storage *storage,
         const char *name,
         struct sieve_script **script_r,
         enum sieve_error *error_code_r)
{
  struct sieve_storage *def_storage;
  int ret;

  if (*error_code_r != SIEVE_ERROR_NOT_FOUND ||
      (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0 ||
      !storage->is_personal)
    return -1;

  /* Not found; if this name maps to the default script,
     try to access that instead */
  e_debug(storage->event, "Trying default script instead");

  /* Failed; try using default script location
     (not for temporary failures, read/write access, or dsync) */
  ret = sieve_storage_create_default_for(storage, &def_storage,
                 error_code_r, NULL);
  if (ret < 0)
    return -1;

  if (strcmp(def_storage->script_name, name) != 0) {
    sieve_storage_set_error(storage,
      SIEVE_ERROR_NOT_FOUND,
      "Default script '%s' not found",
      str_sanitize(name, 80));
    *error_code_r = storage->error_code;
    sieve_storage_unref(&def_storage);
    return -1;
  }

  struct sieve_script *def_script;

  ret = sieve_storage_get_script_direct(def_storage, name,
                &def_script, error_code_r);
  if (ret < 0)
    sieve_storage_copy_error(storage, def_storage);
  sieve_storage_unref(&def_storage);
  if (ret < 0)
    return -1;
  i_assert(def_script != NULL);

  *script_r = def_script;
  return 0;
}

int sieve_storage_get_script(struct sieve_storage *storage, const char *name,
           struct sieve_script **script_r,
           enum sieve_error *error_code_r)
{
  *script_r = NULL;
  sieve_error_args_init(&error_code_r, NULL);
  sieve_storage_clear_error(storage);

  if (sieve_storage_get_script_direct(storage, name,
              script_r, error_code_r) >= 0)
    return 0;

  /* Try default instead if appropriate */

  return sieve_storage_get_default_script(storage, name,
            script_r, error_code_r);
}

int sieve_storage_open_script(struct sieve_storage *storage, const char *name,
            struct sieve_script **script_r,
            enum sieve_error *error_code_r)
{
  struct sieve_script *script;

  *script_r = NULL;
  sieve_error_args_init(&error_code_r, NULL);
  sieve_storage_clear_error(storage);

  if (sieve_storage_get_script(storage, name, &script, error_code_r) < 0)
    return -1;
  if (sieve_script_open(script, error_code_r) == 0) {
    *script_r = script;
    return 0;
  }
  sieve_script_unref(&script);

  /* Try default instead if appropriate */

  if (sieve_storage_get_default_script(storage, name,
               &script, error_code_r) < 0)
    return -1;
  if (sieve_script_open(script, error_code_r) < 0) {
    sieve_script_unref(&script);
    return -1;
  }
  *script_r = script;
  return 0;
}

static int
sieve_storage_check_script_direct(struct sieve_storage *storage,
          const char *name,
          enum sieve_error *error_code_r)
{
  struct sieve_script *script;
  int ret;

  sieve_error_args_init(&error_code_r, NULL);
  sieve_storage_clear_error(storage);

  if (sieve_storage_get_script_direct(storage, name,
              &script, error_code_r) < 0)
    return (*error_code_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1);

  ret = sieve_script_open(script, error_code_r);
  sieve_script_unref(&script);
  return (ret >= 0 ? 1 :
    (*error_code_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1));
}

int sieve_storage_check_script(struct sieve_storage *storage, const char *name,
             enum sieve_error *error_code_r)
{
  struct sieve_script *script;

  sieve_error_args_init(&error_code_r, NULL);
  sieve_storage_clear_error(storage);

  if (sieve_storage_open_script(storage, name, &script, error_code_r) < 0)
    return (*error_code_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1);

  sieve_script_unref(&script);
  return 1;
}

/*
 * Active script
 */

static int
sieve_storage_active_script_do_get_name(struct sieve_storage *storage,
          const char **name_r, bool *default_r)
          ATTR_NULL(3)
{
  int ret;

  i_assert(storage->is_personal);

  if (default_r != NULL)
    *default_r = FALSE;

  i_assert(storage->v.active_script_get_name != NULL);
  ret = storage->v.active_script_get_name(storage, name_r);
  if (ret < 0) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);
    if (storage->error_code == SIEVE_ERROR_NOT_FOUND) {
      sieve_storage_clear_error(storage);
      ret = 0;
    }
  }

  if (ret != 0 ||
      (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0)
    return ret;

  struct sieve_storage *def_storage;

  /* Failed; try using default script location
     (not for temporary failures, read/write access, or dsync) */
  ret = sieve_storage_create_default_for(storage, &def_storage,
                 NULL, NULL);
  if (ret < 0)
    return -1;

  *name_r = def_storage->script_name;

  ret = sieve_storage_check_script(def_storage,
           def_storage->script_name, NULL);
  if (ret < 0) {
    sieve_storage_copy_error(storage, def_storage);
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);
  }
  sieve_storage_unref(&def_storage);
  if (ret <= 0)
    return ret;

  if (default_r != NULL)
    *default_r = TRUE;
  return 1;
}

int sieve_storage_active_script_get_name(struct sieve_storage *storage,
           const char **name_r)
{
  return sieve_storage_active_script_do_get_name(storage, name_r, NULL);
}

int sieve_storage_active_script_is_default(struct sieve_storage *storage)
{
  const char *name;
  bool is_default = FALSE;
  int ret;

  i_assert(storage->is_personal);
  ret = sieve_storage_active_script_do_get_name(storage, &name,
                  &is_default);
  return (ret < 0 ? -1 : (is_default ? 1 : 0));
}

int sieve_storage_active_script_open(struct sieve_storage *storage,
             struct sieve_script **script_r,
             enum sieve_error *error_code_r)
{
  struct sieve_script *script = NULL;
  int ret;

  /* When called for non-personal (default) storage, just open the primary
     script by explicit path or name. */
  if (!storage->is_personal) {
    return sieve_storage_open_script(storage, NULL,
             script_r, error_code_r);
  }

  *script_r = NULL;
  sieve_error_args_init(&error_code_r, NULL);
  sieve_storage_clear_error(storage);

  i_assert(storage->v.active_script_open != NULL);
  ret = storage->v.active_script_open(storage, &script);
  i_assert(ret <= 0);
  i_assert(ret == 0 ||
     (storage->error_code != SIEVE_ERROR_NONE &&
      storage->error != NULL));

  if (ret == 0 || storage->error_code != SIEVE_ERROR_NOT_FOUND ||
      (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0) {
    if (ret < 0)
      *error_code_r = storage->error_code;
    *script_r = script;
    return ret;
  }

  struct sieve_storage *def_storage;

  /* Try default script location */
  ret = sieve_storage_create_default_for(storage, &def_storage,
                 error_code_r, NULL);
  if (ret < 0)
    return -1;

  ret = sieve_storage_open_script(def_storage, NULL,
          script_r, error_code_r);
  if (ret < 0)
    sieve_storage_copy_error(storage, def_storage);
  sieve_storage_unref(&def_storage);
  return ret;
}

int sieve_storage_deactivate(struct sieve_storage *storage, time_t mtime)
{
  int ret;

  i_assert(storage->is_personal);
  i_assert((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);

  sieve_storage_clear_error(storage);

  i_assert(storage->v.deactivate != NULL);
  ret = storage->v.deactivate(storage);

  if (ret >= 0) {
    struct event_passthrough *e =
      event_create_passthrough(storage->event)->
      set_name("sieve_storage_deactivated");
    e_debug(e->event(), "Storage deactivated");

    sieve_storage_set_modified(storage, mtime);
    (void)sieve_storage_sync_deactivate(storage);
  } else {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);

    struct event_passthrough *e =
      event_create_passthrough(storage->event)->
      add_str("error", storage->error)->
      set_name("sieve_storage_deactivated");
    e_debug(e->event(), "Failed to deactivate storage: %s",
      storage->error);
  }

  return ret;
}

int sieve_storage_active_script_get_last_change(struct sieve_storage *storage,
            time_t *last_change_r)
{
  i_assert(storage->is_personal);
  i_assert(storage->v.active_script_get_last_change != NULL);

  return storage->v.active_script_get_last_change(storage, last_change_r);
}

/*
 * Listing scripts
 */

int sieve_storage_list_init(struct sieve_storage *storage,
          struct sieve_storage_list_context **lctx_r)
{
  struct sieve_storage_list_context *lctx;

  *lctx_r = NULL;
  sieve_storage_clear_error(storage);

  i_assert(storage->v.list_init != NULL);
  if (storage->v.list_init(storage, &lctx) < 0) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);
    return -1;
  }

  lctx->storage = storage;
  sieve_storage_ref(storage);

  if ((storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0) {
    /* No default script involved; return right away */
    *lctx_r = lctx;
    return 0;
  }

  /* May need to list default script as well */

  enum sieve_error error_code;

  if (sieve_storage_create_default_for(storage, &lctx->def_storage,
               &error_code, NULL) < 0 &&
      error_code != SIEVE_ERROR_NOT_FOUND)
    return -1;

  *lctx_r = lctx;
  return 0;
}

const char *
sieve_storage_list_next(struct sieve_storage_list_context *lctx, bool *active_r)
{
  struct sieve_storage *storage = lctx->storage;
  const char *scriptname;
  bool script_active = FALSE;

  sieve_storage_clear_error(storage);

  i_assert(storage->v.list_next != NULL);
  scriptname = storage->v.list_next(lctx, &script_active);

  i_assert(!script_active || !lctx->seen_active);
  if (script_active)
    lctx->seen_active = TRUE;

  struct sieve_storage *def_storage = lctx->def_storage;
  bool have_default = (def_storage != NULL &&
           def_storage->script_name != NULL);

  if (scriptname != NULL) {
    /* Remember when we see that the storage has its own script for
       default */
    if (have_default &&
        strcmp(scriptname, def_storage->script_name) == 0)
      lctx->seen_default = TRUE;

  } else if (have_default && !lctx->seen_default &&
       sieve_storage_check_script(def_storage, NULL, NULL) > 0) {

    /* Return default script at the end if it was not listed
       thus far (storage backend has no script under default
       name) */
    scriptname = def_storage->script_name;
    lctx->seen_default = TRUE;

    /* Mark default as active if no normal script is active */
    if (!lctx->seen_active) {
      script_active = TRUE;
      lctx->seen_active = TRUE;
    }
  }

  if (active_r != NULL)
    *active_r = script_active;
  return scriptname;
}

int sieve_storage_list_deinit(struct sieve_storage_list_context **_lctx)
{
  struct sieve_storage_list_context *lctx = *_lctx;

  if (lctx == NULL)
    return 0;
  *_lctx = NULL;

  struct sieve_storage *storage = lctx->storage;
  struct sieve_storage *def_storage = lctx->def_storage;
  int ret;

  i_assert(storage->v.list_deinit != NULL);
  ret = storage->v.list_deinit(lctx);
  i_assert(ret >= 0 ||
     (storage->error_code != SIEVE_ERROR_NONE &&
      storage->error != NULL));

  sieve_storage_unref(&def_storage);
  sieve_storage_unref(&storage);
  return ret;
}

/*
 * Saving scripts
 */

static struct event *
sieve_storage_save_create_event(struct sieve_storage *storage,
        const char *scriptname) ATTR_NULL(2)
{
  struct event *event;

  event = event_create(storage->event);
  event_add_str(event, "script_name", scriptname);
  if (scriptname == NULL) {
    event_set_append_log_prefix(event, "save: ");
  } else {
    event_set_append_log_prefix(
      event, t_strdup_printf("script '%s': save: ",
                 scriptname));
  }

  return event;
}

static void sieve_storage_save_cleanup(struct sieve_storage_save_context *sctx)
{
  sieve_script_unref(&sctx->scriptobject);
}

static void sieve_storage_save_deinit(struct sieve_storage_save_context **_sctx)
{
  struct sieve_storage_save_context *sctx = *_sctx;

  *_sctx = NULL;
  if (sctx == NULL)
    return;

  sieve_storage_save_cleanup(sctx);
  event_unref(&sctx->event);
  pool_unref(&sctx->pool);
}

struct sieve_storage_save_context *
sieve_storage_save_init(struct sieve_storage *storage, const char *scriptname,
      struct istream *input)
{
  struct sieve_storage_save_context *sctx;

  sieve_storage_clear_error(storage);

  if (scriptname != NULL) {
    /* Validate script name */
    if (!sieve_script_name_is_valid(scriptname)) {
      sieve_storage_set_error(storage,
        SIEVE_ERROR_BAD_PARAMS,
        "Invalid Sieve script name '%s'.",
        str_sanitize(scriptname, 80));
      return NULL;
    }
  }

  i_assert((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);

  i_assert(storage->v.save_alloc != NULL);
  sctx = storage->v.save_alloc(storage);
  sctx->storage = storage;

  sctx->event = sieve_storage_save_create_event(storage, scriptname);

  struct event_passthrough *e =
    event_create_passthrough(sctx->event)->
    set_name("sieve_storage_save_started");
  e_debug(e->event(), "Started saving script");

  i_assert(storage->v.save_init != NULL);
  if ((storage->v.save_init(sctx, scriptname, input)) < 0) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);

    struct event_passthrough *e =
      event_create_passthrough(sctx->event)->
      add_str("error", storage->error)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Failed to save script: %s",
      storage->error);

    sieve_storage_save_deinit(&sctx);
    return NULL;
  }

  sctx->mtime = (time_t)-1;

  i_assert(sctx->input != NULL);

  return sctx;
}

int sieve_storage_save_continue(struct sieve_storage_save_context *sctx)
{
  struct sieve_storage *storage = sctx->storage;
  int ret;

  sieve_storage_clear_error(storage);

  i_assert(storage->v.save_continue != NULL);
  ret = storage->v.save_continue(sctx);
  if (ret < 0) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);
    sctx->failed = TRUE;
  }
  return ret;
}

int sieve_storage_save_finish(struct sieve_storage_save_context *sctx)
{
  struct sieve_storage *storage = sctx->storage;
  bool was_failed = sctx->failed;
  int ret;

  sieve_storage_clear_error(storage);

  i_assert(!sctx->finished);
  sctx->finished = TRUE;

  i_assert(storage->v.save_finish != NULL);
  ret = storage->v.save_finish(sctx);
  if (ret < 0 && !was_failed) {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);

    struct event_passthrough *e =
      event_create_passthrough(sctx->event)->
      add_str("error", storage->error)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Failed to upload script: %s",
      storage->error);

    sctx->failed = TRUE;
  }
  return ret;
}

void sieve_storage_save_set_mtime(struct sieve_storage_save_context *sctx,
          time_t mtime)
{
  sctx->mtime = mtime;
}

struct sieve_script *
sieve_storage_save_get_tempscript(struct sieve_storage_save_context *sctx)
{
  struct sieve_storage *storage = sctx->storage;

  if (sctx->failed)
    return NULL;

  if (sctx->scriptobject != NULL)
    return sctx->scriptobject;

  sieve_storage_clear_error(storage);

  i_assert(storage->v.save_get_tempscript != NULL);
  sctx->scriptobject = storage->v.save_get_tempscript(sctx);

  i_assert(sctx->scriptobject != NULL ||
     (storage->error_code != SIEVE_ERROR_NONE &&
      storage->error != NULL));
  return sctx->scriptobject;
}

bool sieve_storage_save_will_activate(struct sieve_storage_save_context *sctx)
{
  struct sieve_storage *storage = sctx->storage;

  if (sctx->scriptname == NULL)
    return FALSE;

  sieve_storage_clear_error(storage);

  if (sctx->active_scriptname == NULL) {
    const char *scriptname;

    if (sieve_storage_active_script_get_name(sctx->storage,
               &scriptname) > 0) {
      sctx->active_scriptname =
        p_strdup(sctx->pool, scriptname);
    }
  }

  /* Is the requested script active? */
  return (sctx->active_scriptname != NULL &&
    strcmp(sctx->scriptname, sctx->active_scriptname) == 0);
}

static int
sieve_storage_save_is_activating_default(
  struct sieve_storage_save_context *sctx)
{
  struct sieve_storage *storage = sctx->storage;

  if ((storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0)
    return 0;
  if (!sieve_storage_save_will_activate(sctx))
    return 0;

  struct sieve_storage *def_storage;
  enum sieve_error error_code;
  int ret = 0;

  if (sieve_storage_create_default_for(storage, &def_storage,
               &error_code, NULL) < 0) {
    if (error_code == SIEVE_ERROR_NOT_FOUND)
      return 0;
    return -1;
  }

  if (strcmp(sctx->scriptname, def_storage->script_name) == 0) {
    ret = sieve_storage_check_script_direct(
      storage, def_storage->script_name, &error_code);
    if (ret == 0 ||
        (ret < 0 && error_code == SIEVE_ERROR_NOT_FOUND))
      ret = 1;
    else if (ret > 0)
      ret = 0;
  }

  sieve_storage_unref(&def_storage);
  return ret;
}

int sieve_storage_save_commit(struct sieve_storage_save_context **_sctx)
{
  struct sieve_storage_save_context *sctx = *_sctx;
  struct sieve_storage *storage;
  const char *scriptname;
  bool default_activate = FALSE;
  int ret;

  *_sctx = NULL;
  if (sctx == NULL)
    return 0;

  storage = sctx->storage;
  scriptname = sctx->scriptname;
  sieve_storage_clear_error(storage);

  i_assert(!sctx->failed);
  i_assert(sctx->finished);
  i_assert(sctx->scriptname != NULL);

  /* Check whether we're replacing the default active script */
  ret = sieve_storage_save_is_activating_default(sctx);
  if (ret < 0)
    return -1;
  default_activate = (ret > 0);

  sieve_storage_save_cleanup(sctx);

  i_assert(storage->v.save_commit != NULL);
  ret = storage->v.save_commit(sctx);
  i_assert(ret >= 0 ||
     (storage->error_code != SIEVE_ERROR_NONE &&
      storage->error != NULL));

  /* Implicitly activate it when we're replacing the default
     active script */
  if (ret >= 0 && default_activate) {
    struct sieve_script *script;
    enum sieve_error error_code;

    if (sieve_storage_open_script(storage, scriptname,
                &script, &error_code) < 0) {
      /* Somehow not actually saved */
      ret = (error_code == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
    } else if (sieve_script_activate(script, (time_t)-1) < 0) {
      /* Failed to activate; roll back */
      ret = -1;
      (void)sieve_script_delete(script, TRUE);
    }
    sieve_script_unref(&script);

    if (ret < 0) {
      e_error(sctx->event,
        "Failed to implicitly activate script '%s' "
        "while replacing the default active script",
        scriptname);
    }
  }

  if (ret >= 0) {
    struct event_passthrough *e =
      event_create_passthrough(sctx->event)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Finished saving script");

    /* set INBOX mailbox attribute */
    (void)sieve_storage_sync_script_save(storage, scriptname);
  } else {
    struct event_passthrough *e =
      event_create_passthrough(sctx->event)->
      add_str("error", storage->error)->
      set_name("sieve_storage_save_finished");

    e_debug(e->event(), "Failed to save script: %s",
      storage->error);
  }

  sieve_storage_save_deinit(&sctx);
  return ret;
}

void sieve_storage_save_cancel(struct sieve_storage_save_context **_sctx)
{
  struct sieve_storage_save_context *sctx = *_sctx;
  struct sieve_storage *storage;

  *_sctx = NULL;
  if (sctx == NULL)
    return;

  storage = sctx->storage;

  sctx->failed = TRUE;

  sieve_storage_save_cleanup(sctx);

  if (!sctx->finished)
    (void)sieve_storage_save_finish(sctx);

  struct event_passthrough *e =
    event_create_passthrough(sctx->event)->
    add_str("error", "Canceled")->
    set_name("sieve_storage_save_finished");
  e_debug(e->event(), "Canceled saving script");

  i_assert(storage->v.save_cancel != NULL);
  storage->v.save_cancel(sctx);

  sieve_storage_save_deinit(&sctx);
}

int sieve_storage_save_as_active(struct sieve_storage *storage,
         struct istream *input, time_t mtime)
{
  struct event *event;
  int ret;

  sieve_storage_clear_error(storage);

  event = event_create(storage->event);
  event_set_append_log_prefix(event, "active script: save: ");

  struct event_passthrough *e =
    event_create_passthrough(event)->
    set_name("sieve_storage_save_started");
  e_debug(e->event(), "Started saving active script");

  i_assert(storage->v.save_as_active != NULL);
  ret = storage->v.save_as_active(storage, input, mtime);

  if (ret >= 0) {
    struct event_passthrough *e =
      event_create_passthrough(event)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Finished saving active script");
  } else {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);

    struct event_passthrough *e =
      event_create_passthrough(event)->
      add_str("error", storage->error)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Failed to save active script: %s",
      storage->error);
  }

  event_unref(&event);
  return ret;
}

int sieve_storage_save_as(struct sieve_storage *storage, struct istream *input,
        const char *name)
{
  struct event *event;
  int ret;

  sieve_storage_clear_error(storage);

  event = sieve_storage_save_create_event(storage, name);

  struct event_passthrough *e =
    event_create_passthrough(event)->
    set_name("sieve_storage_save_started");
  e_debug(e->event(), "Started saving script");

  i_assert(storage->v.save_as != NULL);
  ret = storage->v.save_as(storage, input, name);

  if (ret >= 0) {
    struct event_passthrough *e =
      event_create_passthrough(event)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Finished saving sieve script");
  } else {
    i_assert(storage->error_code != SIEVE_ERROR_NONE);
    i_assert(storage->error != NULL);

    struct event_passthrough *e =
      event_create_passthrough(event)->
      add_str("error", storage->error)->
      set_name("sieve_storage_save_finished");
    e_debug(e->event(), "Failed to save script: %s",
      storage->error);
  }

  event_unref(&event);
  return ret;
}

/*
 * Checking quota
 */

bool sieve_storage_quota_validsize(struct sieve_storage *storage, size_t size,
           uint64_t *limit_r)
{
  uint64_t max_size;

  max_size = sieve_max_script_size(storage->svinst);
  if (max_size > 0 && size > max_size) {
    *limit_r = max_size;
    return FALSE;
  }

  return TRUE;
}

uint64_t sieve_storage_quota_max_script_size(struct sieve_storage *storage)
{
  return sieve_max_script_size(storage->svinst);
}

int sieve_storage_quota_havespace(struct sieve_storage *storage,
          const char *scriptname, size_t size,
          enum sieve_storage_quota *quota_r,
          uint64_t *limit_r)
{
  *quota_r = SIEVE_STORAGE_QUOTA_NONE;
  *limit_r = 0;

  /* Check the script size */
  if (!sieve_storage_quota_validsize(storage, size, limit_r)) {
    *quota_r = SIEVE_STORAGE_QUOTA_MAXSIZE;
    return 0;
  }

  /* Do we need to scan the storage (quota enabled) ? */
  if (storage->max_scripts == 0 && storage->max_storage == 0)
    return 1;

  if (storage->v.quota_havespace == NULL)
    return 1;

  return storage->v.quota_havespace(storage, scriptname, size,
            quota_r, limit_r);
}

/*
 * Properties
 */

const char *sieve_storage_name(const struct sieve_storage *storage)
{
  return storage->name;
}

bool sieve_storage_is_default(const struct sieve_storage *storage)
{
  return storage->is_default;
}

bool sieve_storage_is_personal(struct sieve_storage *storage)
{
  return storage->is_personal;
}

/*
 * Error handling
 */

void sieve_storage_clear_error(struct sieve_storage *storage)
{
  i_free(storage->error);
  storage->error_code = SIEVE_ERROR_NONE;
  storage->error = NULL;
}

void sieve_storage_set_error(struct sieve_storage *storage,
           enum sieve_error error_code, const char *fmt, ...)
{
  va_list va;

  sieve_storage_clear_error(storage);

  if (fmt != NULL) {
    va_start(va, fmt);
    storage->error = i_strdup_vprintf(fmt, va);
    va_end(va);
  }

  storage->error_code = error_code;
}

void sieve_storage_copy_error(struct sieve_storage *storage,
            const struct sieve_storage *source)
{
  sieve_storage_clear_error(storage);
  storage->error = i_strdup(source->error);
  storage->error_code = source->error_code;
}

void sieve_storage_set_internal_error(struct sieve_storage *storage)
{
  const char *error;

  sieve_storage_clear_error(storage);
  sieve_error_create_internal(&storage->error_code, &error);
  storage->error = i_strdup(error);
}

void sieve_storage_set_critical(struct sieve_storage *storage,
        const char *fmt, ...)
{
  va_list va;

  if (fmt != NULL) {
    if ((storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0) {
      va_start(va, fmt);
      e_error(storage->svinst->event, "%s storage: %s",
        storage->driver_name,
        t_strdup_vprintf(fmt, va));
      va_end(va);

      sieve_storage_set_internal_error(storage);

    } else {
      sieve_storage_clear_error(storage);

      /* no user is involved while synchronizing, so do it the
         normal way */
      va_start(va, fmt);
      storage->error = i_strdup_vprintf(fmt, va);
      va_end(va);

      storage->error_code = SIEVE_ERROR_TEMP_FAILURE;
    }
  }
}

void sieve_storage_set_not_found_error(struct sieve_storage *storage,
               const char *name)
{
  enum sieve_error error_code;
  const char *error;

  sieve_storage_clear_error(storage);
  name = (name == NULL || *name == '\0' ? storage->script_name : name);
  sieve_error_create_script_not_found(name, &error_code, &error);
  storage->error_code = error_code;
  storage->error = i_strdup(error);
}

const char *
sieve_storage_get_last_error(struct sieve_storage *storage,
           enum sieve_error *error_code_r)
{
  /* We get here only in error situations, so we have to return some
     error. If storage->error is NULL, it means we forgot to set it at
     some point..
   */

  if (error_code_r != NULL)
    *error_code_r = storage->error_code;

  return storage->error != NULL ? storage->error : "Unknown error";
}

/*
 * Storage sequence
 */

int sieve_storage_sequence_create(struct sieve_instance *svinst,
          struct event *event_parent,
          const char *cause, const char *type,
          struct sieve_storage_sequence **sseq_r,
          enum sieve_error *error_code_r,
          const char **error_r)
{
  const struct sieve_storage_settings *storage_set;
  const char *const *storage_names;
  unsigned int storage_count;
  const char *error;

  *sseq_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  if (settings_get(event_parent, &sieve_storage_setting_parser_info,
       SETTINGS_GET_FLAG_SORT_FILTER_ARRAYS,
       &storage_set, &error) < 0) {
    e_error(event_parent, "%s", error);
    sieve_error_create_internal(error_code_r, error_r);
    return -1;
  }
  if (array_is_created(&storage_set->storages))
    storage_names = array_get(&storage_set->storages,
            &storage_count);
  else {
    storage_names = empty_str_array;
    storage_count = 0;
  }

  struct sieve_storage_sequence *sseq;

  sseq = i_new(struct sieve_storage_sequence, 1);
  sseq->svinst = svinst;
  sseq->cause = i_strdup(cause);
  sseq->type = i_strdup(type);
  sseq->storage_set = storage_set;
  sseq->storage_names = storage_names;
  sseq->storage_count = storage_count;

  sseq->event_parent = event_parent;
  event_ref(event_parent);

  *sseq_r = sseq;
  return 0;
}

int sieve_storage_sequence_next(struct sieve_storage_sequence *sseq,
        struct sieve_storage **storage_r,
        enum sieve_error *error_code_r,
        const char **error_r)
{
  struct sieve_instance *svinst = sseq->svinst;
  int ret;

  *storage_r = NULL;
  sieve_error_args_init(&error_code_r, &error_r);

  while (sseq->storage_index < sseq->storage_count) {
    unsigned int index = sseq->storage_index++;

    ret = sieve_storage_init(svinst, sseq->event_parent,
           sseq->cause, sseq->type,
           sseq->storage_names[index], TRUE, 0,
           storage_r, error_code_r, error_r);
    if (ret < 0) {
      if (*error_code_r == SIEVE_ERROR_NOT_FOUND) {
        *error_code_r = SIEVE_ERROR_NONE;
        *error_r = NULL;
        continue;
      }
      return -1;
    }
    if (ret > 0) {
      i_assert(*storage_r != NULL);
      return 1;
    }
  }

  return 0;
}

void sieve_storage_sequence_free(struct sieve_storage_sequence **_sseq)
{
  struct sieve_storage_sequence *sseq = *_sseq;

  if (sseq == NULL)
    return;
  *_sseq = NULL;

  event_unref(&sseq->event_parent);
  i_free(sseq->cause);
  i_free(sseq->type);
  settings_free(sseq->storage_set);
  i_free(sseq);
}

Coverage Report

Created: 2026-07-30 06:43