summaryrefslogtreecommitdiff
path: root/src/hello/gnunet-hello.c
blob: b3f48322ba72e19fd98329a8017cacb0cefb874f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
/*
     This file is part of GNUnet
     Copyright (C) 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
 */
/**
 * @file hello/gnunet-hello.c
 * @brief change HELLO files to never expire
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_protocols.h"
#include "gnunet_hello_lib.h"

/**
 * Closure for #add_to_buf().
 */
struct AddContext
{
  /**
   * Where to add.
   */
  char *buf;

  /**
   * Maximum number of bytes left
   */
  size_t max;

  /**
   * Number of bytes added so far.
   */
  size_t ret;
};

static int address_count;


/**
 * Add the given address with infinit expiration to the buffer.
 *
 * @param cls closure
 * @param address address to add
 * @param expiration old expiration
 * @return #GNUNET_OK keep iterating
 */
static int
add_to_buf (void *cls,
            const struct GNUNET_HELLO_Address *address,
            struct GNUNET_TIME_Absolute expiration)
{
  struct AddContext *ac = cls;
  size_t ret;

  ret = GNUNET_HELLO_add_address (address,
                                  GNUNET_TIME_UNIT_FOREVER_ABS,
                                  ac->buf,
                                  ac->max);
  ac->buf += ret;
  ac->max -= ret;
  ac->ret += ret;
  address_count++;
  return GNUNET_OK;
}


/**
 * Add addresses from the address list to the HELLO.
 *
 * @param cls the HELLO with the addresses to add
 * @param max maximum space available
 * @param buf where to add the addresses
 * @return number of bytes added, 0 to terminate
 */
static ssize_t
add_from_hello (void *cls, size_t max, void *buf)
{
  struct GNUNET_HELLO_Message **orig = cls;
  struct AddContext ac;

  if (NULL == *orig)
    return GNUNET_SYSERR; /* already done */
  ac.buf = buf;
  ac.max = max;
  ac.ret = 0;
  GNUNET_assert (
    NULL ==
    GNUNET_HELLO_iterate_addresses (*orig, GNUNET_NO, &add_to_buf, &ac));
  *orig = NULL;
  return ac.ret;
}


int
main (int argc, char *argv[])
{
  struct GNUNET_DISK_FileHandle *fh;
  struct GNUNET_HELLO_Message *orig;
  struct GNUNET_HELLO_Message *result;
  struct GNUNET_PeerIdentity pid;
  uint64_t fsize;

  address_count = 0;

  GNUNET_log_setup ("gnunet-hello", "INFO", NULL);
  if (argc != 2)
  {
    fprintf (stderr, "%s", _ ("Call with name of HELLO file to modify.\n"));
    return 1;
  }
  if (GNUNET_OK !=
      GNUNET_DISK_file_size (argv[1], &fsize, GNUNET_YES, GNUNET_YES))
  {
    fprintf (stderr,
             _ ("Error accessing file `%s': %s\n"),
             argv[1],
             strerror (errno));
    return 1;
  }
  if (fsize > 65536)
  {
    fprintf (stderr, _ ("File `%s' is too big to be a HELLO\n"), argv[1]);
    return 1;
  }
  if (fsize < sizeof(struct GNUNET_MessageHeader))
  {
    fprintf (stderr, _ ("File `%s' is too small to be a HELLO\n"), argv[1]);
    return 1;
  }
  fh = GNUNET_DISK_file_open (argv[1],
                              GNUNET_DISK_OPEN_READ,
                              GNUNET_DISK_PERM_USER_READ);
  if (NULL == fh)
  {
    fprintf (stderr,
             _ ("Error opening file `%s': %s\n"),
             argv[1],
             strerror (errno));
    return 1;
  }
  {
    char buf[fsize] GNUNET_ALIGN;

    GNUNET_assert (fsize == GNUNET_DISK_file_read (fh, buf, fsize));
    GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
    orig = (struct GNUNET_HELLO_Message *) buf;
    if ((fsize < GNUNET_HELLO_size (orig)) ||
        (GNUNET_OK != GNUNET_HELLO_get_id (orig, &pid)))
    {
      fprintf (stderr,
               _ ("Did not find well-formed HELLO in file `%s'\n"),
               argv[1]);
      return 1;
    }
    {
      char *pids;

      pids = GNUNET_CRYPTO_eddsa_public_key_to_string (&pid.public_key);
      fprintf (stdout, "Processing HELLO for peer `%s'\n", pids);
      GNUNET_free (pids);
    }
    result = GNUNET_HELLO_create (&pid.public_key,
                                  &add_from_hello,
                                  &orig,
                                  GNUNET_HELLO_is_friend_only (orig));
    GNUNET_assert (NULL != result);
    fh =
      GNUNET_DISK_file_open (argv[1],
                             GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_TRUNCATE,
                             GNUNET_DISK_PERM_USER_READ
                             | GNUNET_DISK_PERM_USER_WRITE);
    if (NULL == fh)
    {
      fprintf (stderr,
               _ ("Error opening file `%s': %s\n"),
               argv[1],
               strerror (errno));
      GNUNET_free (result);
      return 1;
    }
    fsize = GNUNET_HELLO_size (result);
    if (fsize != GNUNET_DISK_file_write (fh, result, fsize))
    {
      fprintf (stderr,
               _ ("Error writing HELLO to file `%s': %s\n"),
               argv[1],
               strerror (errno));
      (void) GNUNET_DISK_file_close (fh);
      return 1;
    }
    GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
  }
  fprintf (stderr,
           _ ("Modified %u addresses, wrote %u bytes\n"),
           address_count,
           (unsigned int) fsize);
  return 0;
}


/* end of gnunet-hello.c */