1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <hesiod.h>
#include <netdb.h>
#include <netinet/in.h>
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Hesiod uses a format for service entries that differs from the
traditional format. We therefore declare our own parser. */
#define ENTNAME servent
struct servent_data {};
#define TRAILING_LIST_MEMBER s_aliases
#define TRAILING_LIST_SEPARATOR_P isspace
#include <nss/nss_files/files-parse.c>
#define ISSC_OR_SPACE(c) ((c) == ';' || isspace (c))
LINE_PARSER
("#",
STRING_FIELD (result->s_name, ISSC_OR_SPACE, 1);
STRING_FIELD (result->s_proto, ISSC_OR_SPACE, 1);
INT_FIELD (result->s_port, ISSC_OR_SPACE, 10, 0, htons);
)
enum nss_status
_nss_hesiod_setservent (int stayopen)
{
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_hesiod_endservent (void)
{
return NSS_STATUS_SUCCESS;
}
static enum nss_status
lookup (const char *name, const char *type, const char *protocol,
struct servent *serv, char *buffer, size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
size_t linebuflen;
void *context;
char **list, **item;
int parse_res;
int found;
int olderr = errno;
if (hesiod_init (&context) < 0)
return NSS_STATUS_UNAVAIL;
list = hesiod_resolve (context, name, type);
if (list == NULL)
{
int err = errno;
hesiod_end (context);
__set_errno (olderr);
return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
}
linebuflen = buffer + buflen - data->linebuffer;
item = list;
found = 0;
do
{
size_t len = strlen (*item) + 1;
if (linebuflen < len)
{
hesiod_free_list (context, list);
hesiod_end (context);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
memcpy (data->linebuffer, *item, len);
parse_res = parse_line (buffer, serv, data, buflen, errnop);
if (parse_res == -1)
{
hesiod_free_list (context, list);
hesiod_end (context);
return NSS_STATUS_TRYAGAIN;
}
if (parse_res > 0)
found = protocol == NULL || strcasecmp (serv->s_proto, protocol) == 0;
++item;
}
while (*item != NULL && !found);
hesiod_free_list (context, list);
hesiod_end (context);
if (found == 0)
{
__set_errno (olderr);
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_hesiod_getservbyname_r (const char *name, const char *protocol,
struct servent *serv,
char *buffer, size_t buflen, int *errnop)
{
return lookup (name, "service", protocol, serv, buffer, buflen, errnop);
}
enum nss_status
_nss_hesiod_getservbyport_r (const int port, const char *protocol,
struct servent *serv,
char *buffer, size_t buflen, int *errnop)
{
char portstr[6]; /* Port numbers are restricted to 16 bits. */
snprintf (portstr, sizeof portstr, "%d", ntohs (port));
return lookup (portstr, "port", protocol, serv, buffer, buflen, errnop);
}
|
