1 | /* Copyright (C) 1997-2018 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 | /* Hesiod uses a format for service entries that differs from the |
29 | traditional format. We therefore declare our own parser. */ |
30 | |
31 | #define ENTNAME servent |
32 | |
33 | struct servent_data {}; |
34 | |
35 | #define TRAILING_LIST_MEMBER s_aliases |
36 | #define TRAILING_LIST_SEPARATOR_P isspace |
37 | #include <nss/nss_files/files-parse.c> |
38 | #define ISSC_OR_SPACE(c) ((c) == ';' || isspace (c)) |
39 | LINE_PARSER |
40 | ("#" , |
41 | STRING_FIELD (result->s_name, ISSC_OR_SPACE, 1); |
42 | STRING_FIELD (result->s_proto, ISSC_OR_SPACE, 1); |
43 | INT_FIELD (result->s_port, ISSC_OR_SPACE, 10, 0, htons); |
44 | ) |
45 | |
46 | enum nss_status |
47 | _nss_hesiod_setservent (int stayopen) |
48 | { |
49 | return NSS_STATUS_SUCCESS; |
50 | } |
51 | |
52 | enum nss_status |
53 | _nss_hesiod_endservent (void) |
54 | { |
55 | return NSS_STATUS_SUCCESS; |
56 | } |
57 | |
58 | static enum nss_status |
59 | lookup (const char *name, const char *type, const char *protocol, |
60 | struct servent *serv, char *buffer, size_t buflen, int *errnop) |
61 | { |
62 | struct parser_data *data = (void *) buffer; |
63 | size_t linebuflen; |
64 | void *context; |
65 | char **list, **item; |
66 | int parse_res; |
67 | int found; |
68 | int olderr = errno; |
69 | |
70 | if (hesiod_init (&context) < 0) |
71 | return NSS_STATUS_UNAVAIL; |
72 | |
73 | list = hesiod_resolve (context, name, type); |
74 | if (list == NULL) |
75 | { |
76 | int err = errno; |
77 | hesiod_end (context); |
78 | __set_errno (olderr); |
79 | return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL; |
80 | } |
81 | |
82 | linebuflen = buffer + buflen - data->linebuffer; |
83 | |
84 | item = list; |
85 | found = 0; |
86 | do |
87 | { |
88 | size_t len = strlen (*item) + 1; |
89 | |
90 | if (linebuflen < len) |
91 | { |
92 | hesiod_free_list (context, list); |
93 | hesiod_end (context); |
94 | *errnop = ERANGE; |
95 | return NSS_STATUS_TRYAGAIN; |
96 | } |
97 | |
98 | memcpy (data->linebuffer, *item, len); |
99 | |
100 | parse_res = parse_line (buffer, serv, data, buflen, errnop); |
101 | if (parse_res == -1) |
102 | { |
103 | hesiod_free_list (context, list); |
104 | hesiod_end (context); |
105 | return NSS_STATUS_TRYAGAIN; |
106 | } |
107 | |
108 | if (parse_res > 0) |
109 | found = protocol == NULL || strcasecmp (serv->s_proto, protocol) == 0; |
110 | |
111 | ++item; |
112 | } |
113 | while (*item != NULL && !found); |
114 | |
115 | hesiod_free_list (context, list); |
116 | hesiod_end (context); |
117 | |
118 | if (found == 0) |
119 | { |
120 | __set_errno (olderr); |
121 | return NSS_STATUS_NOTFOUND; |
122 | } |
123 | |
124 | return NSS_STATUS_SUCCESS; |
125 | } |
126 | |
127 | enum nss_status |
128 | _nss_hesiod_getservbyname_r (const char *name, const char *protocol, |
129 | struct servent *serv, |
130 | char *buffer, size_t buflen, int *errnop) |
131 | { |
132 | return lookup (name, "service" , protocol, serv, buffer, buflen, errnop); |
133 | } |
134 | |
135 | enum nss_status |
136 | _nss_hesiod_getservbyport_r (const int port, const char *protocol, |
137 | struct servent *serv, |
138 | char *buffer, size_t buflen, int *errnop) |
139 | { |
140 | char portstr[6]; /* Port numbers are restricted to 16 bits. */ |
141 | |
142 | snprintf (portstr, sizeof portstr, "%d" , ntohs (port)); |
143 | |
144 | return lookup (portstr, "port" , protocol, serv, buffer, buflen, errnop); |
145 | } |
146 | |