GNUnet  0.19.2
gnunet-resolver.c
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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 
27 #include "platform.h"
28 #include "gnunet_util_lib.h"
30 
31 #define GET_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
32 
36 static int reverse;
37 
38 
46 static void
47 print_hostname (void *cls,
48  const char *hostname)
49 {
50  (void) cls;
51  if (NULL == hostname)
52  return;
53  fprintf (stdout,
54  "%s\n",
55  hostname);
56 }
57 
58 
66 static void
67 print_sockaddr (void *cls,
68  const struct sockaddr *addr,
69  socklen_t addrlen)
70 {
71  (void) cls;
72  if (NULL == addr)
73  return;
74  fprintf (stdout,
75  "%s\n",
76  GNUNET_a2s (addr,
77  addrlen));
78 }
79 
80 
89 static void
90 run (void *cls,
91  char *const *args,
92  const char *cfgfile,
93  const struct GNUNET_CONFIGURATION_Handle *cfg)
94 {
95  const struct sockaddr *sa;
96  socklen_t salen;
97  struct sockaddr_in v4;
98  struct sockaddr_in6 v6;
99 
100  (void) cls;
101  (void) cfgfile;
102  (void) cfg;
103  if (NULL == args[0])
104  return;
105  if (! reverse)
106  {
108  AF_UNSPEC,
109  GET_TIMEOUT,
111  NULL);
112  return;
113  }
114 
115  sa = NULL;
116  memset (&v4, 0, sizeof(v4));
117  v4.sin_family = AF_INET;
118 #if HAVE_SOCKADDR_IN_SIN_LEN
119  v4.sin_len = sizeof(v4);
120 #endif
121  if (1 == inet_pton (AF_INET,
122  args[0],
123  &v4.sin_addr))
124  {
125  sa = (struct sockaddr *) &v4;
126  salen = sizeof(v4);
127  }
128  memset (&v6, 0, sizeof(v6));
129  v6.sin6_family = AF_INET6;
130 #if HAVE_SOCKADDR_IN_SIN_LEN
131  v6.sin6_len = sizeof(v6);
132 #endif
133  if (1 == inet_pton (AF_INET6,
134  args[0],
135  &v6.sin6_addr))
136  {
137  sa = (struct sockaddr *) &v6;
138  salen = sizeof(v6);
139  }
140  if (NULL == sa)
141  {
142  fprintf (stderr,
143  "`%s' is not a valid IP: %s\n",
144  args[0],
145  strerror (errno));
146  return;
147  }
148  GNUNET_RESOLVER_hostname_get (sa, salen,
149  GNUNET_YES,
150  GET_TIMEOUT,
152  NULL);
153 }
154 
155 
163 int
164 main (int argc, char *const *argv)
165 {
168  "reverse",
169  gettext_noop ("perform a reverse lookup"),
170  &reverse),
172  };
173  int ret;
174 
175  if (GNUNET_OK !=
176  GNUNET_STRINGS_get_utf8_args (argc, argv,
177  &argc, &argv))
178  return 2;
179 
180  ret = (GNUNET_OK ==
181  GNUNET_PROGRAM_run (argc, argv,
182  "gnunet-resolver [hostname]",
183  gettext_noop ("Use built-in GNUnet stub resolver"),
184  options,
185  &run, NULL)) ? 0 : 1;
186  GNUNET_free_nz ((void *) argv);
187  return ret;
188 }
189 
190 
191 /* end of gnunet-resolver.c */
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
#define gettext_noop(String)
Definition: gettext.h:70
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static void print_sockaddr(void *cls, const struct sockaddr *addr, socklen_t addrlen)
Callback function to display address.
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.
int main(int argc, char *const *argv)
The main function to access GNUnet's DNS resolver.
static void print_hostname(void *cls, const char *hostname)
Prints each hostname obtained from DNS.
static int reverse
Flag for reverse lookup.
#define GET_TIMEOUT
static char * hostname
Our hostname; we give this to all the peers we start.
Functions related to doing DNS lookups.
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.
@ GNUNET_OK
@ GNUNET_YES
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).
#define GNUNET_free_nz(ptr)
Wrapper around free.
enum GNUNET_GenericReturnValue 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,...
Definition: program.c:400
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:940
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.
enum GNUNET_GenericReturnValue GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1222
Definition of a command line option.