GNUnet  0.11.x
Macros | Functions
nss_gns.c File Reference
#include <gnunet_config.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <netdb.h>
#include <sys/socket.h>
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include "nss_gns_query.h"
#include <arpa/inet.h>
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Macros

#define ALIGN(idx)
 macro to align idx to 32bit boundary More...
 

Functions

enum nss_status _nss_gns_gethostbyname2_r (const char *name, int af, struct hostent *result, char *buffer, size_t buflen, int *errnop, int *h_errnop)
 The gethostbyname hook executed by nsswitch. More...
 
enum nss_status _nss_gns_gethostbyname_r (const char *name, struct hostent *result, char *buffer, size_t buflen, int *errnop, int *h_errnop)
 The gethostbyname hook executed by nsswitch. More...
 
enum nss_status _nss_gns_gethostbyaddr_r (const void *addr, int len, int af, struct hostent *result, char *buffer, size_t buflen, int *errnop, int *h_errnop)
 The gethostbyaddr hook executed by nsswitch We can't do this so we always return NSS_STATUS_UNAVAIL. More...
 

Macro Definition Documentation

◆ ALIGN

#define ALIGN (   idx)
Value:
do { \
if (idx % sizeof(void*)) \
idx += (sizeof(void*) - idx % sizeof(void*)); /* Align on 32 bit boundary */ \
} while (0)

macro to align idx to 32bit boundary

Definition at line 39 of file nss_gns.c.

Referenced by _nss_gns_gethostbyname2_r().

Function Documentation

◆ _nss_gns_gethostbyname2_r()

enum nss_status _nss_gns_gethostbyname2_r ( const char *  name,
int  af,
struct hostent *  result,
char *  buffer,
size_t  buflen,
int *  errnop,
int *  h_errnop 
)

The gethostbyname hook executed by nsswitch.

Parameters
namethe name to resolve
afthe address family to resolve
resultthe result hostent
bufferthe result buffer
buflenlength of the buffer
errnopidk
h_errnopidk
Returns
a nss_status code

Definition at line 58 of file nss_gns.c.

References ALIGN, userdata::count, userdata::data, userdata::data_len, gns_resolve_name(), l, and status.

Referenced by _nss_gns_gethostbyname_r().

65 {
66  struct userdata u;
67  enum nss_status status = NSS_STATUS_UNAVAIL;
68  int i;
69  size_t address_length;
70  size_t l;
71  size_t idx;
72  size_t astart;
73 
74  if (af == AF_UNSPEC)
75 #ifdef NSS_IPV6_ONLY
76  af = AF_INET6;
77 #else
78  af = AF_INET;
79 #endif
80 
81 #ifdef NSS_IPV4_ONLY
82  if (af != AF_INET)
83 #elif NSS_IPV6_ONLY
84  if (af != AF_INET6)
85 #else
86  if ((af != AF_INET) &&
87  (af != AF_INET6))
88 #endif
89  {
90  *errnop = EINVAL;
91  *h_errnop = NO_RECOVERY;
92 
93  goto finish;
94  }
95 
96  address_length = (af == AF_INET) ? sizeof(ipv4_address_t) :
97  sizeof(ipv6_address_t);
98  if (buflen <
99  sizeof(char*) /* alias names */
100  + strlen (name) + 1)
101  { /* official name */
102  *errnop = ERANGE;
103  *h_errnop = NO_RECOVERY;
104  status = NSS_STATUS_TRYAGAIN;
105 
106  goto finish;
107  }
108  u.count = 0;
109  u.data_len = 0;
110  i = gns_resolve_name (af,
111  name,
112  &u);
113  if (-1 == i)
114  {
115  *errnop = errno;
116  status = NSS_STATUS_UNAVAIL;
117  *h_errnop = NO_RECOVERY;
118  goto finish;
119  }
120  if (-2 == i)
121  {
122  *errnop = ENOENT;
123  *h_errnop = NO_RECOVERY;
124  status = NSS_STATUS_UNAVAIL;
125  goto finish;
126  }
127  if (-3 == i)
128  {
129  *errnop = ETIMEDOUT;
130  *h_errnop = HOST_NOT_FOUND;
131  status = NSS_STATUS_NOTFOUND;
132  goto finish;
133  }
134  if (0 == u.count)
135  {
136  *errnop = 0; /* success */
137  *h_errnop = NO_DATA; /* success */
138  status = NSS_STATUS_NOTFOUND;
139  goto finish;
140  }
141  /* Alias names */
142  *((char**) buffer) = NULL;
143  result->h_aliases = (char**) buffer;
144  idx = sizeof(char*);
145 
146  /* Official name */
147  strcpy (buffer + idx,
148  name);
149  result->h_name = buffer + idx;
150  idx += strlen (name) + 1;
151 
152  ALIGN (idx);
153 
154  result->h_addrtype = af;
155  result->h_length = address_length;
156 
157  /* Check if there's enough space for the addresses */
158  if (buflen < idx + u.data_len + sizeof(char*) * (u.count + 1))
159  {
160  *errnop = ERANGE;
161  *h_errnop = NO_RECOVERY;
162  status = NSS_STATUS_TRYAGAIN;
163  goto finish;
164  }
165  /* Addresses */
166  astart = idx;
167  l = u.count * address_length;
168  if (0 != l)
169  memcpy (buffer + astart,
170  &u.data,
171  l);
172  /* address_length is a multiple of 32bits, so idx is still aligned
173  * correctly */
174  idx += l;
175 
176  /* Address array address_length is always a multiple of 32bits */
177  for (i = 0; i < u.count; i++)
178  ((char**) (buffer + idx))[i] = buffer + astart + address_length * i;
179  ((char**) (buffer + idx))[i] = NULL;
180  result->h_addr_list = (char**) (buffer + idx);
181 
182  status = NSS_STATUS_SUCCESS;
183 
184 finish:
185  return status;
186 }
#define ALIGN(idx)
macro to align idx to 32bit boundary
Definition: nss_gns.c:39
static struct LoggingHandle * l
int gns_resolve_name(int af, const char *name, struct userdata *u)
Wrapper function that uses gnunet-gns cli tool to resolve an IPv4/6 address.
Definition: nss_gns_query.c:58
uint16_t status
See PRISM_STATUS_*-constants.
static int result
Global testing status.
const char * name
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◆ _nss_gns_gethostbyname_r()

enum nss_status _nss_gns_gethostbyname_r ( const char *  name,
struct hostent *  result,
char *  buffer,
size_t  buflen,
int *  errnop,
int *  h_errnop 
)

The gethostbyname hook executed by nsswitch.

Parameters
namethe name to resolve
resultthe result hostent
bufferthe result buffer
buflenlength of the buffer
errnop[out]the low-level error code to return to the application
h_errnopidk
Returns
a nss_status code

Definition at line 201 of file nss_gns.c.

References _nss_gns_gethostbyname2_r().

207 {
209  AF_UNSPEC,
210  result,
211  buffer,
212  buflen,
213  errnop,
214  h_errnop);
215 }
static int result
Global testing status.
enum nss_status _nss_gns_gethostbyname2_r(const char *name, int af, struct hostent *result, char *buffer, size_t buflen, int *errnop, int *h_errnop)
The gethostbyname hook executed by nsswitch.
Definition: nss_gns.c:58
const char * name
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◆ _nss_gns_gethostbyaddr_r()

enum nss_status _nss_gns_gethostbyaddr_r ( const void *  addr,
int  len,
int  af,
struct hostent *  result,
char *  buffer,
size_t  buflen,
int *  errnop,
int *  h_errnop 
)

The gethostbyaddr hook executed by nsswitch We can't do this so we always return NSS_STATUS_UNAVAIL.

Parameters
addrthe address to resolve
lenthe length of the address
afthe address family of the address
resultthe result hostent
bufferthe result buffer
buflenlength of the buffer
errnop[out]the low-level error code to return to the application
h_errnopidk
Returns
NSS_STATUS_UNAVAIL

Definition at line 233 of file nss_gns.c.

241 {
242  (void) addr;
243  (void) len;
244  (void) af;
245  (void) result;
246  (void) buffer;
247  (void) buflen;
248  *errnop = EINVAL;
249  *h_errnop = NO_RECOVERY;
250  /* NOTE we allow to leak this into DNS so no NOTFOUND */
251  return NSS_STATUS_UNAVAIL;
252 }
static int result
Global testing status.
uint16_t len
length of data (which is always a uint32_t, but presumably this can be used to specify that fewer byt...