GNUnet  0.11.x
gnunet-resolver.c
Go to the documentation of this file.
1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2010 GNUnet e.V.
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_util_lib.h"
29 
30 #define GET_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
31 
35 static int reverse;
36 
37 
45 static void
46 print_hostname (void *cls,
47  const char *hostname)
48 {
49  (void) cls;
50  if (NULL == hostname)
51  return;
52  fprintf (stdout,
53  "%s\n",
54  hostname);
55 }
56 
57 
65 static void
66 print_sockaddr (void *cls,
67  const struct sockaddr *addr,
68  socklen_t addrlen)
69 {
70  (void) cls;
71  if (NULL == addr)
72  return;
73  fprintf (stdout,
74  "%s\n",
75  GNUNET_a2s (addr,
76  addrlen));
77 }
78 
79 
88 static void
89 run (void *cls,
90  char *const *args,
91  const char *cfgfile,
92  const struct GNUNET_CONFIGURATION_Handle *cfg)
93 {
94  const struct sockaddr *sa;
95  socklen_t salen;
96  struct sockaddr_in v4;
97  struct sockaddr_in6 v6;
98 
99  (void) cls;
100  (void) cfgfile;
101  (void) cfg;
102  if (NULL == args[0])
103  return;
104  if (! reverse)
105  {
106  GNUNET_RESOLVER_ip_get (args[0],
107  AF_UNSPEC,
108  GET_TIMEOUT,
110  NULL);
111  return;
112  }
113 
114  sa = NULL;
115  memset (&v4, 0, sizeof(v4));
116  v4.sin_family = AF_INET;
117 #if HAVE_SOCKADDR_IN_SIN_LEN
118  v4.sin_len = sizeof(v4);
119 #endif
120  if (1 == inet_pton (AF_INET,
121  args[0],
122  &v4.sin_addr))
123  {
124  sa = (struct sockaddr *) &v4;
125  salen = sizeof(v4);
126  }
127  memset (&v6, 0, sizeof(v6));
128  v6.sin6_family = AF_INET6;
129 #if HAVE_SOCKADDR_IN_SIN_LEN
130  v6.sin6_len = sizeof(v6);
131 #endif
132  if (1 == inet_pton (AF_INET6,
133  args[0],
134  &v6.sin6_addr))
135  {
136  sa = (struct sockaddr *) &v6;
137  salen = sizeof(v6);
138  }
139  if (NULL == sa)
140  {
141  fprintf (stderr,
142  "`%s' is not a valid IP: %s\n",
143  args[0],
144  strerror (errno));
145  return;
146  }
147  GNUNET_RESOLVER_hostname_get (sa, salen,
148  GNUNET_YES,
149  GET_TIMEOUT,
151  NULL);
152 }
153 
154 
162 int
163 main (int argc, char *const *argv)
164 {
165  struct GNUNET_GETOPT_CommandLineOption options[] = {
167  "reverse",
168  gettext_noop ("perform a reverse lookup"),
169  &reverse),
171  };
172  int ret;
173 
174  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
175  return 2;
176 
177  ret = (GNUNET_OK ==
178  GNUNET_PROGRAM_run (argc, argv, "gnunet-resolver [hostname]",
179  gettext_noop ("Use build-in GNUnet stub resolver"),
180  options, &run, NULL)) ? 0 : 1;
181  GNUNET_free ((void*) argv);
182  return ret;
183 }
184 
185 
186 /* end of gnunet-resolver.c */
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
static void print_sockaddr(void *cls, const struct sockaddr *addr, socklen_t addrlen)
Callback function to display address.
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1438
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg)
Main function that will be run by the scheduler.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
struct GNUNET_RESOLVER_RequestHandle * GNUNET_RESOLVER_ip_get(const char *hostname, int af, struct GNUNET_TIME_Relative timeout, GNUNET_RESOLVER_AddressCallback callback, void *callback_cls)
Convert a string to one or more IP addresses.
Definition: resolver_api.c:939
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Definition of a command line option.
struct GNUNET_RESOLVER_RequestHandle * GNUNET_RESOLVER_hostname_get(const struct sockaddr *sa, socklen_t salen, int do_resolve, struct GNUNET_TIME_Relative timeout, GNUNET_RESOLVER_HostnameCallback callback, void *cls)
Perform a reverse DNS lookup.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
static int reverse
Flag for reverse lookup.
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
int main(int argc, char *const *argv)
The main function to access GNUnet&#39;s DNS resolver.
static char * hostname
Our hostname; we give this to all the peers we start.
configuration data
Definition: configuration.c:85
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_flag(char shortName, const char *name, const char *description, int *val)
Allow user to specify a flag (which internally means setting an integer to 1/GNUNET_YES/GNUNET_OK.
static void print_hostname(void *cls, const char *hostname)
Prints each hostname obtained from DNS.
int GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration, parse options).
Definition: program.c:367
#define GNUNET_YES
Definition: gnunet_common.h:77
#define GET_TIMEOUT
#define GNUNET_free(ptr)
Wrapper around free.
#define gettext_noop(String)
Definition: gettext.h:69