}
-/**
- * Try to read the private key from the given file.
- *
- * @param filename file to read the key from
- * @return NULL on error
- */
-static struct GNUNET_CRYPTO_EccPrivateKey *
-try_read_key (const char *filename)
-{
- struct GNUNET_CRYPTO_EccPrivateKey *ret;
- struct GNUNET_DISK_FileHandle *fd;
- OFF_T fs;
-
- if (GNUNET_YES != GNUNET_DISK_file_test (filename))
- return NULL;
-
- /* key file exists already, read it! */
- if (NULL == (fd = GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READ,
- GNUNET_DISK_PERM_NONE)))
- {
- LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_ERROR, "open", filename);
- return NULL;
- }
- if (GNUNET_OK != (GNUNET_DISK_file_handle_size (fd, &fs)))
- {
- LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_ERROR, "stat", filename);
- (void) GNUNET_DISK_file_close (fd);
- return NULL;
- }
- if (0 == fs)
- {
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fd));
- return NULL;
- }
- if (fs > UINT16_MAX)
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("File `%s' does not contain a valid private key (too long, %llu bytes). Deleting it.\n"),
- filename,
- (unsigned long long) fs);
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fd));
- if (0 != UNLINK (filename))
- LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "unlink", filename);
- return NULL;
- }
- {
- char enc[fs];
-
- GNUNET_break (fs == GNUNET_DISK_file_read (fd, enc, fs));
- if (NULL == (ret = GNUNET_CRYPTO_ecc_decode_key ((char *) enc, fs, GNUNET_YES)))
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("File `%s' does not contain a valid private key (failed decode, %llu bytes). Deleting it.\n"),
- filename,
- (unsigned long long) fs);
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fd));
- if (0 != UNLINK (filename))
- LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "unlink", filename);
- return NULL;
- }
- }
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fd));
- return ret;
-}
-
-
/**
* Wait for a short time (we're trying to lock a file or want
* to give another process a shot at finishing a disk write, etc.).
}
-/**
- * Handle to cancel private key generation and state for the
- * key generation operation.
- */
-struct GNUNET_CRYPTO_EccKeyGenerationContext
-{
-
- /**
- * Continuation to call upon completion.
- */
- GNUNET_CRYPTO_EccKeyCallback cont;
-
- /**
- * Closure for 'cont'.
- */
- void *cont_cls;
-
- /**
- * Name of the file.
- */
- char *filename;
-
- /**
- * Handle to the helper process which does the key generation.
- */
- struct GNUNET_OS_Process *gnunet_ecc;
-
- /**
- * Handle to 'stdout' of gnunet-ecc. We 'read' on stdout to detect
- * process termination (instead of messing with SIGCHLD).
- */
- struct GNUNET_DISK_PipeHandle *gnunet_ecc_out;
-
- /**
- * Location where we store the private key if it already existed.
- * (if this is used, 'filename', 'gnunet_ecc' and 'gnunet_ecc_out' will
- * not be used).
- */
- struct GNUNET_CRYPTO_EccPrivateKey *pk;
-
- /**
- * Task reading from 'gnunet_ecc_out' to wait for process termination.
- */
- GNUNET_SCHEDULER_TaskIdentifier read_task;
-
-};
-
-
-/**
- * Abort ECC key generation.
- *
- * @param gc key generation context to abort
- */
-void
-GNUNET_CRYPTO_ecc_key_create_stop (struct GNUNET_CRYPTO_EccKeyGenerationContext *gc)
-{
- if (GNUNET_SCHEDULER_NO_TASK != gc->read_task)
- {
- GNUNET_SCHEDULER_cancel (gc->read_task);
- gc->read_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (NULL != gc->gnunet_ecc)
- {
- (void) GNUNET_OS_process_kill (gc->gnunet_ecc, SIGKILL);
- GNUNET_break (GNUNET_OK ==
- GNUNET_OS_process_wait (gc->gnunet_ecc));
- GNUNET_OS_process_destroy (gc->gnunet_ecc);
- GNUNET_DISK_pipe_close (gc->gnunet_ecc_out);
- }
-
- if (NULL != gc->filename)
- {
- if ( (0 != UNLINK (gc->filename)) &&
- (ENOENT != errno) )
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink", gc->filename);
- GNUNET_free (gc->filename);
- }
- if (NULL != gc->pk)
- GNUNET_CRYPTO_ecc_key_free (gc->pk);
- GNUNET_free (gc);
-}
-
-
-/**
- * Task called upon shutdown or process termination of 'gnunet-ecc' during
- * ECC key generation. Check where we are and perform the appropriate
- * action.
- *
- * @param cls the 'struct GNUNET_CRYPTO_EccKeyGenerationContext'
- * @param tc scheduler context
- */
-static void
-check_key_generation_completion (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_CRYPTO_EccKeyGenerationContext *gc = cls;
- struct GNUNET_CRYPTO_EccPrivateKey *pk;
-
- gc->read_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- {
- gc->cont (gc->cont_cls, NULL, _("interrupted by shutdown"));
- GNUNET_CRYPTO_ecc_key_create_stop (gc);
- return;
- }
- GNUNET_assert (GNUNET_OK ==
- GNUNET_OS_process_wait (gc->gnunet_ecc));
- GNUNET_OS_process_destroy (gc->gnunet_ecc);
- gc->gnunet_ecc = NULL;
- if (NULL == (pk = try_read_key (gc->filename)))
- {
- GNUNET_break (0);
- gc->cont (gc->cont_cls, NULL, _("gnunet-ecc failed"));
- GNUNET_CRYPTO_ecc_key_create_stop (gc);
- return;
- }
- gc->cont (gc->cont_cls, pk, NULL);
- GNUNET_DISK_pipe_close (gc->gnunet_ecc_out);
- GNUNET_free (gc->filename);
- GNUNET_free (gc);
-}
-
-
-/**
- * Return the private ECC key which already existed on disk
- * (asynchronously) to the caller.
- *
- * @param cls the 'struct GNUNET_CRYPTO_EccKeyGenerationContext'
- * @param tc scheduler context (unused)
- */
-static void
-async_return_key (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_CRYPTO_EccKeyGenerationContext *gc = cls;
-
- gc->cont (gc->cont_cls,
- gc->pk,
- NULL);
- GNUNET_free (gc);
-}
-
-
-/**
- * Create a new private key by reading it from a file. If the files
- * does not exist, create a new key and write it to the file. If the
- * contents of the file are invalid the old file is deleted and a
- * fresh key is created.
- *
- * @param filename name of file to use for storage
- * @param cont function to call when done (or on errors)
- * @param cont_cls closure for 'cont'
- * @return handle to abort operation, NULL on fatal errors (cont will not be called if NULL is returned)
- */
-struct GNUNET_CRYPTO_EccKeyGenerationContext *
-GNUNET_CRYPTO_ecc_key_create_start (const char *filename,
- GNUNET_CRYPTO_EccKeyCallback cont,
- void *cont_cls)
-{
- struct GNUNET_CRYPTO_EccKeyGenerationContext *gc;
- struct GNUNET_CRYPTO_EccPrivateKey *pk;
-
- if (NULL != (pk = try_read_key (filename)))
- {
- /* quick happy ending: key already exists! */
- gc = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccKeyGenerationContext));
- gc->pk = pk;
- gc->cont = cont;
- gc->cont_cls = cont_cls;
- gc->read_task = GNUNET_SCHEDULER_add_now (&async_return_key,
- gc);
- return gc;
- }
- gc = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccKeyGenerationContext));
- gc->filename = GNUNET_strdup (filename);
- gc->cont = cont;
- gc->cont_cls = cont_cls;
- gc->gnunet_ecc_out = GNUNET_DISK_pipe (GNUNET_NO,
- GNUNET_NO,
- GNUNET_NO,
- GNUNET_YES);
- if (NULL == gc->gnunet_ecc_out)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "pipe");
- GNUNET_free (gc->filename);
- GNUNET_free (gc);
- return NULL;
- }
- gc->gnunet_ecc = GNUNET_OS_start_process (GNUNET_NO,
- GNUNET_OS_INHERIT_STD_ERR,
- NULL,
- gc->gnunet_ecc_out,
- "gnunet-ecc",
- "gnunet-ecc",
- gc->filename,
- NULL);
- if (NULL == gc->gnunet_ecc)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "fork");
- GNUNET_DISK_pipe_close (gc->gnunet_ecc_out);
- GNUNET_free (gc->filename);
- GNUNET_free (gc);
- return NULL;
- }
- GNUNET_assert (GNUNET_OK ==
- GNUNET_DISK_pipe_close_end (gc->gnunet_ecc_out,
- GNUNET_DISK_PIPE_END_WRITE));
- gc->read_task = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_DISK_pipe_handle (gc->gnunet_ecc_out,
- GNUNET_DISK_PIPE_END_READ),
- &check_key_generation_completion,
- gc);
- return gc;
-}
-
-
/**
* Create a new private key by reading our peer's key from
* the file specified in the configuration.