nss/nss_files/files-service.c

   1 /* Services file parser in nss_files module.
   2    Copyright (C) 1996-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <netinet/in.h>
  20 #include <netdb.h>
  21 #include <nss.h>
  22
  23 #define ENTNAME         servent
  24 #define DATABASE        "services"
  25
  26 struct servent_data {};
  27
  28 #define TRAILING_LIST_MEMBER            s_aliases
  29 #define TRAILING_LIST_SEPARATOR_P       isspace
  30 #include "files-parse.c"
  31 #define ISSLASH(c) ((c) == '/')
  32 LINE_PARSER
  33 ("#",
  34  STRING_FIELD (result->s_name, isspace, 1);
  35  INT_FIELD (result->s_port, ISSLASH, 10, 0, htons);
  36  STRING_FIELD (result->s_proto, isspace, 1);
  37  )
  38
  39 #include GENERIC
  40
  41 DB_LOOKUP (servbyname, ':',
  42            strlen (name) + 2 + (proto == NULL ? 0 : strlen (proto)),
  43            ("%s/%s", name, proto ?: ""),
  44            {
  45              /* Must match both protocol (if specified) and name.  */
  46              if (proto != NULL && strcmp (result->s_proto, proto))
  47                /* A continue statement here breaks nss_db, because it
  48                 bypasses advancing to the next db entry, and it
  49                 doesn't make nss_files any more efficient.  */;
  50              else
  51                LOOKUP_NAME (s_name, s_aliases)
  52            },
  53            const char *name, const char *proto)
  54
  55 DB_LOOKUP (servbyport, '=', 21 + (proto ? strlen (proto) : 0),
  56            ("%zd/%s", (ssize_t) ntohs (port), proto ?: ""),
  57            {
  58              /* Must match both port and protocol.  */
  59              if (result->s_port == port
  60                  && (proto == NULL
  61                      || strcmp (result->s_proto, proto) == 0))
  62                break;
  63            }, int port, const char *proto)