hesiod/nss_hesiod/hesiod-service.c

   1 /* Copyright (C) 1997, 2000, 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <hesiod.h>
  21 #include <netdb.h>
  22 #include <netinet/in.h>
  23 #include <nss.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "nss_hesiod.h"
  29
  30 /* Hesiod uses a format for service entries that differs from the
  31    traditional format.  We therefore declare our own parser.  */
  32
  33 #define ENTNAME servent
  34
  35 struct servent_data {};
  36
  37 #define TRAILING_LIST_MEMBER            s_aliases
  38 #define TRAILING_LIST_SEPARATOR_P       isspace
  39 #include <nss/nss_files/files-parse.c>
  40 #define ISSC_OR_SPACE(c)        ((c) ==  ';' || isspace (c))
  41 LINE_PARSER
  42 ("#",
  43  STRING_FIELD (result->s_name, ISSC_OR_SPACE, 1);
  44  STRING_FIELD (result->s_proto, ISSC_OR_SPACE, 1);
  45  INT_FIELD (result->s_port, ISSC_OR_SPACE, 10, 0, htons);
  46  )
  47
  48 enum nss_status
  49 _nss_hesiod_setservent (int stayopen)
  50 {
  51   return NSS_STATUS_SUCCESS;
  52 }
  53
  54 enum nss_status
  55 _nss_hesiod_endservent (void)
  56 {
  57   return NSS_STATUS_SUCCESS;
  58 }
  59
  60 static enum nss_status
  61 lookup (const char *name, const char *type, const char *protocol,
  62         struct servent *serv, char *buffer, size_t buflen, int *errnop)
  63 {
  64   struct parser_data *data = (void *) buffer;
  65   size_t linebuflen;
  66   void *context;
  67   char **list, **item;
  68   int parse_res;
  69   int found;
  70   int olderr = errno;
  71
  72   context = _nss_hesiod_init ();
  73   if (context == NULL)
  74     return NSS_STATUS_UNAVAIL;
  75
  76   list = hesiod_resolve (context, name, type);
  77   if (list == NULL)
  78     {
  79       int err = errno;
  80       hesiod_end (context);
  81       __set_errno (olderr);
  82       return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
  83     }
  84
  85   linebuflen = buffer + buflen - data->linebuffer;
  86
  87   item = list;
  88   found = 0;
  89   do
  90     {
  91       size_t len = strlen (*item) + 1;
  92
  93       if (linebuflen < len)
  94         {
  95           hesiod_free_list (context, list);
  96           hesiod_end (context);
  97           *errnop = ERANGE;
  98           return NSS_STATUS_TRYAGAIN;
  99         }
 100
 101       memcpy (data->linebuffer, *item, len);
 102
 103       parse_res = parse_line (buffer, serv, data, buflen, errnop);
 104       if (parse_res == -1)
 105         {
 106           hesiod_free_list (context, list);
 107           hesiod_end (context);
 108           return NSS_STATUS_TRYAGAIN;
 109         }
 110
 111       if (parse_res > 0)
 112         found = protocol == NULL || strcasecmp (serv->s_proto, protocol) == 0;
 113
 114       ++item;
 115     }
 116   while (*item != NULL && !found);
 117
 118   hesiod_free_list (context, list);
 119   hesiod_end (context);
 120
 121   if (found == 0)
 122     {
 123       __set_errno (olderr);
 124       return NSS_STATUS_NOTFOUND;
 125     }
 126
 127   return NSS_STATUS_SUCCESS;
 128 }
 129
 130 enum nss_status
 131 _nss_hesiod_getservbyname_r (const char *name, const char *protocol,
 132                              struct servent *serv,
 133                              char *buffer, size_t buflen, int *errnop)
 134 {
 135   return lookup (name, "service", protocol, serv, buffer, buflen, errnop);
 136 }
 137
 138 enum nss_status
 139 _nss_hesiod_getservbyport_r (const int port, const char *protocol,
 140                              struct servent *serv,
 141                              char *buffer, size_t buflen, int *errnop)
 142 {
 143   char portstr[6];          /* Port numbers are restricted to 16 bits. */
 144
 145   snprintf (portstr, sizeof portstr, "%d", ntohs (port));
 146
 147   return lookup (portstr, "port", protocol, serv, buffer, buflen, errnop);
 148 }