pabc_helper.c File Reference

#include "pabc_helper.h"
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>

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Functions
static const char *	get_homedir ()
static enum GNUNET_GenericReturnValue	write_file (char const *const filename, const char *buffer)
static enum GNUNET_GenericReturnValue	init_pabc_dir ()
static const char *	get_pabcdir ()
enum GNUNET_GenericReturnValue	read_file (char const *const filename, char **buffer)
struct pabc_public_parameters *	PABC_read_issuer_ppfile (const char *f, struct pabc_context *const ctx)
enum GNUNET_GenericReturnValue	PABC_load_public_parameters (struct pabc_context *const ctx, char const *const pp_name, struct pabc_public_parameters **pp)
enum GNUNET_GenericReturnValue	PABC_write_public_parameters (char const *const pp_name, struct pabc_public_parameters *const pp)
enum GNUNET_GenericReturnValue	PABC_write_usr_ctx (char const *const usr_name, char const *const pp_name, struct pabc_context const *const ctx, struct pabc_public_parameters const *const pp, struct pabc_user_context *const usr_ctx)
enum GNUNET_GenericReturnValue	PABC_read_usr_ctx (char const *const usr_name, char const *const pp_name, struct pabc_context const *const ctx, struct pabc_public_parameters const *const pp, struct pabc_user_context **usr_ctx)

Variables
static char	pabc_dir [4096+1]

Function Documentation

get_homedir()

static const char* get_homedir ( )

static

Definition at line 15 of file pabc_helper.c.

References getenv().

Referenced by init_pabc_dir().

{
  const char *homedir;
  if ((homedir = getenv ("HOME")) == NULL)
  {
    homedir = getpwuid (getuid ())->pw_dir;
  }
  return homedir;
}

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write_file()

static enum GNUNET_GenericReturnValue write_file ( char const *const  filename, const char *  buffer  )

static

Definition at line 27 of file pabc_helper.c.

References fh, GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_write(), GNUNET_DISK_OPEN_CREATE, GNUNET_DISK_OPEN_TRUNCATE, GNUNET_DISK_OPEN_WRITE, GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_PERM_USER_WRITE, GNUNET_OK, and GNUNET_SYSERR.

Referenced by PABC_write_public_parameters(), and PABC_write_usr_ctx().

{
  struct GNUNET_DISK_FileHandle *fh;
  fh = GNUNET_DISK_file_open (filename,
                              GNUNET_DISK_OPEN_WRITE
                              | GNUNET_DISK_OPEN_TRUNCATE
                              | GNUNET_DISK_OPEN_CREATE,
                              GNUNET_DISK_PERM_USER_WRITE
                              | GNUNET_DISK_PERM_USER_READ);
  if (fh == NULL)
    return GNUNET_SYSERR;
  if (GNUNET_SYSERR == GNUNET_DISK_file_write (fh,
                                               buffer, strlen (buffer) + 1))
    goto fail;
  GNUNET_DISK_file_close (fh);
  return GNUNET_OK;

fail:
  GNUNET_DISK_file_close (fh);
  return GNUNET_SYSERR;
}

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init_pabc_dir()

static enum GNUNET_GenericReturnValue init_pabc_dir ( )

static

Definition at line 51 of file pabc_helper.c.

References get_homedir(), GNUNET_DISK_directory_create(), and pabc_dir.

Referenced by get_pabcdir().

{
  size_t filename_size = strlen (get_homedir ()) + 1 + strlen (".local") + 1
                         + strlen ("pabc-reclaim") + 1;
  snprintf (pabc_dir, filename_size, "%s/%s/%s",
            get_homedir (), ".local", "pabc-reclaim");
  return GNUNET_DISK_directory_create (pabc_dir);
}

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get_pabcdir()

static const char* get_pabcdir ( )

static

Definition at line 62 of file pabc_helper.c.

References init_pabc_dir(), and pabc_dir.

Referenced by PABC_load_public_parameters(), PABC_read_usr_ctx(), PABC_write_public_parameters(), and PABC_write_usr_ctx().

{
  init_pabc_dir ();
  return pabc_dir;
}

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read_file()

enum GNUNET_GenericReturnValue read_file	(	char const *const	filename,
		char **	buffer
	)

Definition at line 70 of file pabc_helper.c.

References fh, GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_read(), GNUNET_DISK_file_seek(), GNUNET_DISK_file_test(), GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_SEEK_END, GNUNET_DISK_SEEK_SET, GNUNET_free, GNUNET_OK, GNUNET_SYSERR, and GNUNET_YES.

Referenced by PABC_read_issuer_ppfile(), and PABC_read_usr_ctx().

{
  struct GNUNET_DISK_FileHandle *fh;
  if (GNUNET_YES != GNUNET_DISK_file_test (filename))
    return GNUNET_SYSERR;

  fh = GNUNET_DISK_file_open (filename,
                              GNUNET_DISK_OPEN_READ,
                              GNUNET_DISK_PERM_USER_READ);
  if (fh == NULL)
    return GNUNET_SYSERR;
  long lSize = GNUNET_DISK_file_seek (fh, 0, GNUNET_DISK_SEEK_END);
  if (lSize < 0)
    goto fail;
  GNUNET_DISK_file_seek (fh, 0, GNUNET_DISK_SEEK_SET);
  *buffer = calloc ((size_t) lSize + 1, sizeof(char));
  if (*buffer == NULL)
    goto fail;

  // copy the file into the buffer:
  size_t r = GNUNET_DISK_file_read (fh, *buffer, (size_t) lSize);
  if (r != (size_t) lSize)
    goto fail;

  GNUNET_DISK_file_close (fh);
  return GNUNET_OK;

fail:
  GNUNET_DISK_file_close (fh);
  GNUNET_free (*buffer);
  return GNUNET_SYSERR;
}

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PABC_read_issuer_ppfile()

struct pabc_public_parameters* PABC_read_issuer_ppfile	(	const char *	f,
		struct pabc_context *const	ctx
	)

Definition at line 105 of file pabc_helper.c.

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, and read_file().

Referenced by PABC_load_public_parameters().

{
  if (NULL == ctx)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No global context provided\n");
    return NULL;
  }
  struct pabc_public_parameters *pp;
  char *buffer;
  int r;
  r = read_file (f, &buffer);
  if (GNUNET_OK != r)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error reading file\n");
    return NULL;
  }
  if (PABC_OK != pabc_decode_and_new_public_parameters (ctx, &pp, buffer))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to decode public parameters\n");
    PABC_FREE_NULL (buffer);
    return NULL;
  }
  PABC_FREE_NULL (buffer);
  return pp;
}

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PABC_load_public_parameters()

enum GNUNET_GenericReturnValue PABC_load_public_parameters	(	struct pabc_context *const	ctx,
		char const *const	pp_name,
		struct pabc_public_parameters **	pp
	)

Definition at line 134 of file pabc_helper.c.

References get_pabcdir(), GNUNET_DISK_directory_test(), GNUNET_DISK_file_test(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_STRINGS_urlencode(), GNUNET_SYSERR, GNUNET_YES, PABC_PP_EXT, PABC_read_issuer_ppfile(), and PATH_MAX.

Referenced by pabc_create_presentation().

{
  char fname[PATH_MAX];
  char *pp_filename;
  const char *pdir = get_pabcdir ();

  if (ctx == NULL)
    return GNUNET_SYSERR;
  if (pp_name == NULL)
    return GNUNET_SYSERR;

  GNUNET_STRINGS_urlencode (pp_name, strlen (pp_name), &pp_filename);
  if (GNUNET_YES != GNUNET_DISK_directory_test (pdir, GNUNET_YES))
  {
    GNUNET_free (pp_filename);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error reading %s\n", pdir);
    return GNUNET_SYSERR;
  }
  snprintf (fname, PATH_MAX, "%s/%s%s", pdir, pp_filename, PABC_PP_EXT);
  if (GNUNET_YES != GNUNET_DISK_file_test (fname))
  {
    GNUNET_free (pp_filename);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error testing %s\n", fname);
    return GNUNET_SYSERR;
  }
  *pp = PABC_read_issuer_ppfile (fname, ctx);
  if (*pp)
    return GNUNET_OK;
  else
    return GNUNET_SYSERR;
}

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PABC_write_public_parameters()

enum GNUNET_GenericReturnValue PABC_write_public_parameters	(	char const *const	pp_name,
		struct pabc_public_parameters *const	pp
	)

Definition at line 170 of file pabc_helper.c.

References ctx, filename, get_pabcdir(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_OK, GNUNET_STRINGS_urlencode(), GNUNET_SYSERR, PABC_PP_EXT, status, and write_file().

Referenced by cr_cont().

{
  char *json;
  char *filename;
  char *pp_filename;
  enum pabc_status status;
  struct pabc_context *ctx = NULL;

  GNUNET_STRINGS_urlencode (pp_name, strlen (pp_name), &pp_filename);
  PABC_ASSERT (pabc_new_ctx (&ctx));
  // store in json file
  status = pabc_encode_public_parameters (ctx, pp, &json);
  if (status != PABC_OK)
  {
    GNUNET_free (pp_filename);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to encode public parameters.\n");
    pabc_free_ctx (&ctx);
    return GNUNET_SYSERR;
  }

  size_t filename_size =
    strlen (get_pabcdir ()) + 1 + strlen (pp_filename) + strlen (PABC_PP_EXT)
    + 1;
  filename = GNUNET_malloc (filename_size);
  if (! filename)
  {
    GNUNET_free (pp_filename);
    PABC_FREE_NULL (json);
    pabc_free_ctx (&ctx);
    return GNUNET_SYSERR;
  }
  snprintf (filename, filename_size, "%s/%s%s", get_pabcdir (), pp_filename,
            PABC_PP_EXT);

  GNUNET_free (pp_filename);
  if (GNUNET_OK != write_file (filename, json))
  {
    PABC_FREE_NULL (filename);
    PABC_FREE_NULL (json);
    pabc_free_ctx (&ctx);
    return GNUNET_SYSERR;
  }
  PABC_FREE_NULL (filename);
  PABC_FREE_NULL (json);
  pabc_free_ctx (&ctx);
  return GNUNET_OK;
}

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PABC_write_usr_ctx()

enum GNUNET_GenericReturnValue PABC_write_usr_ctx	(	char const *const	usr_name,
		char const *const	pp_name,
		struct pabc_context const *const	ctx,
		struct pabc_public_parameters const *const	pp,
		struct pabc_user_context *const	usr_ctx
	)

Definition at line 222 of file pabc_helper.c.

References get_pabcdir(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_OK, GNUNET_STRINGS_urlencode(), GNUNET_SYSERR, PABC_USR_EXT, status, and write_file().

Referenced by cr_cont().

{

  char *pp_filename;
  char *json = NULL;
  enum pabc_status status;
  char *fname = NULL;

  if (NULL == usr_name)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No issuer given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == pp_name)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No user given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == ctx)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No context given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == pp)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No public parameters given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == usr_ctx)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No user context given.\n");
    return GNUNET_SYSERR;
  }

  GNUNET_STRINGS_urlencode (pp_name, strlen (pp_name), &pp_filename);
  status = pabc_encode_user_ctx (ctx, pp, usr_ctx, &json);
  if (PABC_OK != status)
  {
    GNUNET_free (pp_filename);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to encode user context.\n");
    return status;
  }

  size_t fname_size = strlen (get_pabcdir ()) + 1 + strlen (usr_name) + 1
                      + strlen (pp_filename) + strlen (PABC_USR_EXT) + 1;
  fname = GNUNET_malloc (fname_size);

  snprintf (fname, fname_size, "%s/%s_%s%s", get_pabcdir (), usr_name,
            pp_filename,
            PABC_USR_EXT);

  GNUNET_free (pp_filename);
  if (GNUNET_OK == write_file (fname, json))
  {
    GNUNET_free (fname);
    GNUNET_free (json);
    return GNUNET_OK;
  }
  else
  {
    GNUNET_free (fname);
    GNUNET_free (json);
    return GNUNET_SYSERR;
  }
}

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PABC_read_usr_ctx()

enum GNUNET_GenericReturnValue PABC_read_usr_ctx	(	char const *const	usr_name,
		char const *const	pp_name,
		struct pabc_context const *const	ctx,
		struct pabc_public_parameters const *const	pp,
		struct pabc_user_context **	usr_ctx
	)

Definition at line 294 of file pabc_helper.c.

References get_pabcdir(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_OK, GNUNET_STRINGS_urlencode(), GNUNET_SYSERR, PABC_USR_EXT, read_file(), and status.

Referenced by cr_cont(), and pabc_create_presentation().

{
  char *json = NULL;
  char *pp_filename;
  enum pabc_status status;

  char *fname = NULL;

  if (NULL == usr_name)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No issuer given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == pp_name)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No user given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == ctx)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No context given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == pp)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No public parameters given.\n");
    return GNUNET_SYSERR;
  }
  if (NULL == usr_ctx)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No user context given.\n");
    return GNUNET_SYSERR;
  }
  GNUNET_STRINGS_urlencode (pp_name, strlen (pp_name), &pp_filename);

  size_t fname_size = strlen (get_pabcdir ()) + 1 + strlen (usr_name) + 1
                      + strlen (pp_filename) + strlen (PABC_USR_EXT) + 1;
  fname = GNUNET_malloc (fname_size);
  snprintf (fname, fname_size, "%s/%s_%s%s", get_pabcdir (), usr_name,
            pp_filename,
            PABC_USR_EXT);
  GNUNET_free (pp_filename);
  if (GNUNET_OK != read_file (fname, &json))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to read `%s'\n", fname);
    PABC_FREE_NULL (fname);
    return GNUNET_SYSERR;
  }
  GNUNET_free (fname);

  status = pabc_new_user_context (ctx, pp, usr_ctx);
  if (PABC_OK != status)
  {
    GNUNET_free (json);
    return GNUNET_SYSERR;
  }
  status = pabc_decode_user_ctx (ctx, pp, *usr_ctx, json);
  GNUNET_free (json);
  if (PABC_OK != status)
  {
    pabc_free_user_context (ctx, pp, usr_ctx);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to encode user context.\n");
    return GNUNET_SYSERR;
  }

  return GNUNET_OK;
}

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Variable Documentation

pabc_dir

char pabc_dir[4096+1]

static

Definition at line 12 of file pabc_helper.c.

Referenced by get_pabcdir(), and init_pabc_dir().