1/* Copyright (C) 1997-2021 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 <https://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
28NSS_DECLARE_MODULE_FUNCTIONS (hesiod)
29
30/* Declare a parser for Hesiod protocol entries. Although the format
31 of the entries is identical to those in /etc/protocols, here is no
32 predefined parser for us to use. */
33
34#define ENTNAME protoent
35
36struct protoent_data {};
37
38#define TRAILING_LIST_MEMBER p_aliases
39#define TRAILING_LIST_SEPARATOR_P isspace
40#include <nss/nss_files/files-parse.c>
41LINE_PARSER
42("#",
43 STRING_FIELD (result->p_name, isspace, 1);
44 INT_FIELD (result->p_proto, isspace, 1, 10,);
45 )
46
47enum nss_status
48_nss_hesiod_setprotoent (int stayopen)
49{
50 return NSS_STATUS_SUCCESS;
51}
52
53enum nss_status
54_nss_hesiod_endprotoent (void)
55{
56 return NSS_STATUS_SUCCESS;
57}
58
59static enum nss_status
60lookup (const char *name, const char *type, struct protoent *proto,
61 char *buffer, size_t buflen, int *errnop)
62{
63 struct parser_data *data = (void *) buffer;
64 size_t linebuflen;
65 void *context;
66 char **list, **item;
67 int parse_res;
68 int found;
69 int olderr = errno;
70
71 if (hesiod_init (&context) < 0)
72 return NSS_STATUS_UNAVAIL;
73
74 list = hesiod_resolve (context, name, type);
75 if (list == NULL)
76 {
77 int err = errno;
78 hesiod_end (context);
79 __set_errno (olderr);
80 return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
81 }
82
83 linebuflen = buffer + buflen - data->linebuffer;
84
85 item = list;
86 found = 0;
87 do
88 {
89 size_t len = strlen (*item) + 1;
90
91 if (linebuflen < len)
92 {
93 hesiod_free_list (context, list);
94 hesiod_end (context);
95 *errnop = ERANGE;
96 return NSS_STATUS_TRYAGAIN;
97 }
98
99 memcpy (data->linebuffer, *item, len);
100
101 parse_res = parse_line (buffer, proto, data, buflen, errnop);
102 if (parse_res == -1)
103 {
104 hesiod_free_list (context, list);
105 hesiod_end (context);
106 return NSS_STATUS_TRYAGAIN;
107 }
108
109 if (parse_res > 0)
110 found = 1;
111
112 ++item;
113 }
114 while (*item != NULL && !found);
115
116 hesiod_free_list (context, list);
117 hesiod_end (context);
118
119 if (found == 0)
120 {
121 __set_errno (olderr);
122 return NSS_STATUS_NOTFOUND;
123 }
124
125 return NSS_STATUS_SUCCESS;
126}
127
128enum nss_status
129_nss_hesiod_getprotobyname_r (const char *name, struct protoent *proto,
130 char *buffer, size_t buflen, int *errnop)
131{
132 return lookup (name, "protocol", proto, buffer, buflen, errnop);
133}
134
135enum nss_status
136_nss_hesiod_getprotobynumber_r (const int protocol, struct protoent *proto,
137 char *buffer, size_t buflen, int *errnop)
138{
139 char protostr[21];
140
141 snprintf (protostr, sizeof protostr, "%d", protocol);
142
143 return lookup (protostr, "protonum", proto, buffer, buflen, errnop);
144}
145