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1 | /* |
2 | * nonlocal-shadow.c | |
3 | * shadow database for nss_nonlocal proxy. | |
4 | * | |
5 | * Copyright © 2007 Anders Kaseorg <andersk@mit.edu> | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person | |
8 | * obtaining a copy of this software and associated documentation | |
9 | * files (the "Software"), to deal in the Software without | |
10 | * restriction, including without limitation the rights to use, copy, | |
11 | * modify, merge, publish, distribute, sublicense, and/or sell copies | |
12 | * of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be | |
16 | * included in all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
22 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
23 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
25 | * SOFTWARE. | |
26 | */ | |
27 | ||
28 | #define _GNU_SOURCE | |
29 | #include <sys/types.h> | |
30 | #include <unistd.h> | |
31 | #include <stdlib.h> | |
32 | #include <stdint.h> | |
33 | #include <string.h> | |
34 | #include <dlfcn.h> | |
35 | #include <stdio.h> | |
36 | #include <errno.h> | |
37 | #include <shadow.h> | |
38 | #include <nss.h> | |
39 | ||
40 | #include "nsswitch-internal.h" | |
41 | #include "nonlocal.h" | |
42 | ||
43 | ||
44 | static service_user * | |
45 | nss_shadow_nonlocal_database(void) | |
46 | { | |
47 | static service_user *nip = NULL; | |
48 | if (nip == NULL) | |
49 | __nss_database_lookup("shadow_nonlocal", NULL, "", &nip); | |
50 | ||
51 | return nip; | |
52 | } | |
53 | ||
54 | ||
55 | static service_user *spent_nip = NULL; | |
56 | static void *spent_fct_start; | |
57 | static union { | |
58 | enum nss_status (*l)(struct spwd *pwd, char *buffer, size_t buflen, | |
59 | int *errnop); | |
60 | void *ptr; | |
61 | } spent_fct; | |
62 | static const char *spent_fct_name = "getspent_r"; | |
63 | ||
64 | enum nss_status | |
65 | _nss_nonlocal_setspent(int stayopen) | |
66 | { | |
67 | static const char *fct_name = "setspent"; | |
68 | static void *fct_start = NULL; | |
69 | enum nss_status status; | |
70 | service_user *nip; | |
71 | union { | |
72 | enum nss_status (*l)(int stayopen); | |
73 | void *ptr; | |
74 | } fct; | |
75 | ||
76 | nip = nss_shadow_nonlocal_database(); | |
77 | if (nip == NULL) | |
78 | return NSS_STATUS_UNAVAIL; | |
79 | if (fct_start == NULL) | |
80 | fct_start = __nss_lookup_function(nip, fct_name); | |
81 | fct.ptr = fct_start; | |
82 | do { | |
83 | if (fct.ptr == NULL) | |
84 | status = NSS_STATUS_UNAVAIL; | |
85 | else | |
86 | status = DL_CALL_FCT(fct.l, (stayopen)); | |
87 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); | |
88 | if (status != NSS_STATUS_SUCCESS) | |
89 | return status; | |
90 | ||
91 | spent_nip = nip; | |
92 | if (spent_fct_start == NULL) | |
93 | spent_fct_start = __nss_lookup_function(nip, spent_fct_name); | |
94 | spent_fct.ptr = spent_fct_start; | |
95 | return NSS_STATUS_SUCCESS; | |
96 | } | |
97 | ||
98 | enum nss_status | |
99 | _nss_nonlocal_endspent(void) | |
100 | { | |
101 | static const char *fct_name = "endspent"; | |
102 | static void *fct_start = NULL; | |
103 | enum nss_status status; | |
104 | service_user *nip; | |
105 | union { | |
106 | enum nss_status (*l)(void); | |
107 | void *ptr; | |
108 | } fct; | |
109 | ||
110 | spent_nip = NULL; | |
111 | ||
112 | nip = nss_shadow_nonlocal_database(); | |
113 | if (nip == NULL) | |
114 | return NSS_STATUS_UNAVAIL; | |
115 | if (fct_start == NULL) | |
116 | fct_start = __nss_lookup_function(nip, fct_name); | |
117 | fct.ptr = fct_start; | |
118 | do { | |
119 | if (fct.ptr == NULL) | |
120 | status = NSS_STATUS_UNAVAIL; | |
121 | else | |
122 | status = DL_CALL_FCT(fct.l, ()); | |
123 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); | |
124 | return status; | |
125 | } | |
126 | ||
127 | enum nss_status | |
128 | _nss_nonlocal_getspent_r(struct spwd *pwd, char *buffer, size_t buflen, | |
129 | int *errnop) | |
130 | { | |
131 | enum nss_status status; | |
132 | if (spent_nip == NULL) { | |
133 | status = _nss_nonlocal_setspent(0); | |
134 | if (status != NSS_STATUS_SUCCESS) | |
135 | return status; | |
136 | } | |
137 | do { | |
138 | if (spent_fct.ptr == NULL) | |
139 | status = NSS_STATUS_UNAVAIL; | |
140 | else | |
141 | status = DL_CALL_FCT(spent_fct.l, (pwd, buffer, buflen, errnop)); | |
142 | if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) | |
143 | return status; | |
144 | ||
145 | if (status == NSS_STATUS_SUCCESS) | |
146 | return NSS_STATUS_SUCCESS; | |
147 | } while (__nss_next(&spent_nip, spent_fct_name, &spent_fct.ptr, status, 0) == 0); | |
148 | ||
149 | spent_nip = NULL; | |
150 | return NSS_STATUS_NOTFOUND; | |
151 | } | |
152 | ||
153 | ||
154 | enum nss_status | |
155 | _nss_nonlocal_getspnam_r(const char *name, struct spwd *pwd, | |
156 | char *buffer, size_t buflen, int *errnop) | |
157 | { | |
158 | static const char *fct_name = "getspnam_r"; | |
159 | static void *fct_start = NULL; | |
160 | enum nss_status status; | |
161 | service_user *nip; | |
162 | union { | |
163 | enum nss_status (*l)(const char *name, struct spwd *pwd, | |
164 | char *buffer, size_t buflen, int *errnop); | |
165 | void *ptr; | |
166 | } fct; | |
167 | ||
168 | nip = nss_shadow_nonlocal_database(); | |
169 | if (nip == NULL) | |
170 | return NSS_STATUS_UNAVAIL; | |
171 | if (fct_start == NULL) | |
172 | fct_start = __nss_lookup_function(nip, fct_name); | |
173 | fct.ptr = fct_start; | |
174 | do { | |
175 | if (fct.ptr == NULL) | |
176 | status = NSS_STATUS_UNAVAIL; | |
177 | else | |
178 | status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop)); | |
179 | if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) | |
180 | break; | |
181 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); | |
182 | return status; | |
183 | } |