GNUnet  0.11.x
friends.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2013 Christian Grothoff
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
26 #include "platform.h"
27 #include "gnunet_friends_lib.h"
28 
29 
38 int
41  void *cb_cls)
42 {
43  char *fn;
44  char *data;
45  size_t pos;
46  size_t start;
47  struct GNUNET_PeerIdentity pid;
48  uint64_t fsize;
49  ssize_t ssize;
50 
51  if (GNUNET_OK !=
53  "TOPOLOGY",
54  "FRIENDS",
55  &fn))
56  {
58  "topology",
59  "FRIENDS");
60  return GNUNET_SYSERR;
61  }
62  if ((GNUNET_OK !=
63  GNUNET_DISK_file_test (fn)) &&
64  (GNUNET_OK !=
66  NULL,
67  0,
72  "write",
73  fn);
74  if ((GNUNET_OK !=
76  &fsize,
77  GNUNET_NO,
78  GNUNET_YES)) ||
79  (0 == fsize))
80  {
81  GNUNET_free (fn);
82  return GNUNET_OK;
83  }
84  data = GNUNET_malloc_large (fsize);
85  if (NULL == data)
86  {
88  GNUNET_free (fn);
89  return GNUNET_SYSERR;
90  }
91  ssize = GNUNET_DISK_fn_read (fn,
92  data,
93  fsize);
94  if ((ssize < 0) ||
95  (fsize != (uint64_t) ssize))
96  {
98  "read",
99  "fn");
100  GNUNET_free (fn);
101  GNUNET_free (data);
102  return GNUNET_SYSERR;
103  }
104  start = 0;
105  pos = 0;
106  while (pos < fsize)
107  {
108  while ((pos < fsize) &&
109  (! isspace ((unsigned char) data[pos])))
110  pos++;
111  if (GNUNET_OK !=
113  pos - start,
114  &pid.public_key))
115  {
117  _ (
118  "Syntax error in FRIENDS file at offset %llu, skipping bytes `%.*s'.\n"),
119  (unsigned long long) pos,
120  (int) (pos - start),
121  &data[start]);
122  pos++;
123  start = pos;
124  continue;
125  }
126  pos++;
127  start = pos;
128  cb (cb_cls, &pid);
129  }
130  GNUNET_free (data);
131  GNUNET_free (fn);
132  return GNUNET_OK;
133 }
134 
135 
140 {
145 };
146 
147 
155 struct GNUNET_FRIENDS_Writer *
157 {
158  struct GNUNET_FRIENDS_Writer *w;
159  char *fn;
160 
161  if (GNUNET_OK !=
162  GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
163  {
165  "topology", "FRIENDS");
166  return NULL;
167  }
168  if (GNUNET_OK !=
170  {
172  _ ("Directory for file `%s' does not seem to be writable.\n"),
173  fn);
174  GNUNET_free (fn);
175  return NULL;
176  }
177  if (GNUNET_OK == GNUNET_DISK_file_test (fn))
179  w = GNUNET_new (struct GNUNET_FRIENDS_Writer);
180  w->fh = GNUNET_DISK_file_open (fn,
185  GNUNET_free (fn);
186  if (NULL == w->fh)
187  {
188  GNUNET_free (w);
189  return NULL;
190  }
191  return w;
192 }
193 
194 
201 int
203 {
204  int ret;
205 
206  ret = GNUNET_DISK_file_close (w->fh);
207  GNUNET_free (w);
208  return ret;
209 }
210 
211 
219 int
221  const struct GNUNET_PeerIdentity *friend_id)
222 {
223  char *buf;
224  char *ret;
225  size_t slen;
226 
228  GNUNET_asprintf (&buf,
229  "%s\n",
230  ret);
231  GNUNET_free (ret);
232  slen = strlen (buf);
233  if (slen !=
235  buf,
236  slen))
237  {
238  GNUNET_free (buf);
239  return GNUNET_SYSERR;
240  }
241  GNUNET_free (buf);
242  return GNUNET_OK;
243 }
244 
245 
246 /* end of friends.c */
Create file if it doesn&#39;t exist.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
void(* GNUNET_FRIENDS_Callback)(void *cls, const struct GNUNET_PeerIdentity *friend_id)
Signature of a function called on each friend found.
static int start
Set if we are to start default services (including ARM).
Definition: gnunet-arm.c:39
int GNUNET_FRIENDS_parse(const struct GNUNET_CONFIGURATION_Handle *cfg, GNUNET_FRIENDS_Callback cb, void *cb_cls)
Parse the FRIENDS file.
Definition: friends.c:39
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1126
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
struct GNUNET_FRIENDS_Writer * GNUNET_FRIENDS_write_start(const struct GNUNET_CONFIGURATION_Handle *cfg)
Start writing a fresh FRIENDS file.
Definition: friends.c:156
#define GNUNET_new(type)
Allocate a struct or union of the given type.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_filename(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be the name of a file or directory.
#define GNUNET_malloc_large(size)
Wrapper around malloc.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
static char * fn
Filename of the unique file.
char * GNUNET_CRYPTO_eddsa_public_key_to_string(const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a public key to a string.
Definition: crypto_ecc.c:251
ssize_t GNUNET_DISK_file_write(const struct GNUNET_DISK_FileHandle *h, const void *buffer, size_t n)
Write a buffer to a file.
Definition: disk.c:666
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_public_key_from_string(const char *enc, size_t enclen, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a string representing a public key to a public key.
Definition: crypto_ecc.c:357
static char buf[2048]
void GNUNET_DISK_file_backup(const char *fil)
Move a file out of the way (create a backup) by renaming it to "orig.NUM~" where NUM is the smallest ...
Definition: disk.c:360
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
Handle for writing a friends file.
Definition: friends.c:139
Open the file for writing.
enum GNUNET_GenericReturnValue GNUNET_DISK_fn_write(const char *fn, const void *buf, size_t buf_size, enum GNUNET_DISK_AccessPermissions mode)
Write a buffer to a file atomically.
Definition: disk.c:705
enum GNUNET_GenericReturnValue GNUNET_DISK_file_size(const char *filename, uint64_t *size, int include_symbolic_links, int single_file_mode)
Get the size of the file (or directory) of the given file (in bytes).
Definition: disk.c:222
int GNUNET_FRIENDS_write(struct GNUNET_FRIENDS_Writer *w, const struct GNUNET_PeerIdentity *friend_id)
Add a friend to the friends file.
Definition: friends.c:220
The identity of the host (wraps the signing key of the peer).
int GNUNET_FRIENDS_write_stop(struct GNUNET_FRIENDS_Writer *w)
Finish writing out the friends file.
Definition: friends.c:202
configuration data
Definition: configuration.c:84
#define GNUNET_log(kind,...)
struct GNUNET_DISK_FileHandle * fh
Handle to the file.
Definition: friends.c:144
Fail if file already exists.
enum GNUNET_GenericReturnValue GNUNET_DISK_directory_create_for_file(const char *filename)
Create the directory structure for storing a file.
Definition: disk.c:562
uint32_t data
The data value.
struct GNUNET_DISK_FileHandle * GNUNET_DISK_file_open(const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
Open a file.
Definition: disk.c:1055
Handle used to access files (and pipes).
enum GNUNET_GenericReturnValue GNUNET_DISK_file_test(const char *fil)
Check that fil corresponds to a filename (of a file that exists and that is not a directory)...
Definition: disk.c:437
ssize_t GNUNET_DISK_fn_read(const char *fn, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:644
#define GNUNET_free(ptr)
Wrapper around free.
struct GNUNET_CRYPTO_EddsaPublicKey public_key