1 /* $OpenBSD: application_blocklist.c,v 1.2 2023/12/21 12:43:31 martijn Exp $ */
2
3 /*
4 * Copyright (c) 2022 Martijn van Duren <martijn@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20
21 #include <stddef.h>
22
23 #include <ber.h>
24 #include <stdint.h>
25 #include <stdlib.h>
26
27 #include "application.h"
28 #include "log.h"
29 #include "snmpd.h"
30
31 struct appl_varbind *appl_blocklist_response(size_t);
32 void appl_blocklist_get(struct appl_backend *, int32_t, int32_t, const char *,
33 struct appl_varbind *);
34 void appl_blocklist_getnext(struct appl_backend *, int32_t, int32_t,
35 const char *, struct appl_varbind *);
36
37 struct appl_backend_functions appl_blocklist_functions = {
38 .ab_get = appl_blocklist_get,
39 .ab_getnext = appl_blocklist_getnext,
40 .ab_getbulk = NULL,
41 };
42
43 struct appl_backend appl_blocklist = {
44 .ab_name = "blocklist",
45 .ab_cookie = NULL,
46 .ab_retries = 0,
47 .ab_fn = &appl_blocklist_functions
48 };
49
50 static struct appl_varbind *response = NULL;
51 static size_t responsesz = 0;
52
53 struct appl_varbind *
appl_blocklist_response(size_t nvarbind)54 appl_blocklist_response(size_t nvarbind)
55 {
56 struct appl_varbind *tmp;
57 size_t i;
58
59 if (responsesz < nvarbind) {
60 if ((tmp = recallocarray(response, responsesz, nvarbind,
61 sizeof(*response))) == NULL) {
62 log_warn(NULL);
63 return NULL;
64 }
65 responsesz = nvarbind;
66 response = tmp;
67 }
68 for (i = 0; i < nvarbind; i++)
69 response[i].av_next = i + 1 == nvarbind ?
70 NULL : &(response[i + 1]);
71 return response;
72 }
73
74 void
appl_blocklist_init(void)75 appl_blocklist_init(void)
76 {
77 extern struct snmpd *snmpd_env;
78 size_t i;
79
80 for (i = 0; i < snmpd_env->sc_nblocklist; i++)
81 appl_register(NULL, 150, 1, &(snmpd_env->sc_blocklist[i]),
82 0, 1, 0, 0, &appl_blocklist);
83 }
84
85 void
appl_blocklist_shutdown(void)86 appl_blocklist_shutdown(void)
87 {
88 appl_close(&appl_blocklist);
89 free(response);
90 }
91
92 void
appl_blocklist_get(struct appl_backend * backend,__unused int32_t transactionid,int32_t requestid,__unused const char * ctx,struct appl_varbind * vblist)93 appl_blocklist_get(struct appl_backend *backend, __unused int32_t transactionid,
94 int32_t requestid, __unused const char *ctx, struct appl_varbind *vblist)
95 {
96 struct appl_varbind *vb, *rvb, *rvblist;
97 size_t i;
98
99 for (i = 0, vb = vblist; vb != NULL; vb = vb->av_next)
100 i++;
101 if ((rvblist = appl_blocklist_response(i)) == NULL)
102 goto fail;
103 rvb = rvblist;
104 for (vb = vblist; vb != NULL; vb = vb->av_next, rvb = rvb->av_next) {
105 rvb->av_oid = vb->av_oid;
106 rvb->av_value = appl_exception(APPL_EXC_NOSUCHOBJECT);
107 if (rvb->av_value == NULL)
108 goto fail;
109 }
110
111 appl_response(backend, requestid, APPL_ERROR_NOERROR, 0, rvblist);
112 return;
113 fail:
114 for (rvb = rvblist; rvb != NULL && rvb->av_value != NULL;
115 rvb = rvb->av_next)
116 ober_free_elements(rvb->av_value);
117 appl_response(backend, requestid, APPL_ERROR_GENERR, 1, vb);
118 }
119
120 void
appl_blocklist_getnext(struct appl_backend * backend,__unused int32_t transactionid,int32_t requestid,__unused const char * ctx,struct appl_varbind * vblist)121 appl_blocklist_getnext(struct appl_backend *backend,
122 __unused int32_t transactionid, int32_t requestid, __unused const char *ctx,
123 struct appl_varbind *vblist)
124 {
125 struct appl_varbind *vb, *rvb, *rvblist;
126 size_t i;
127
128 for (i = 0, vb = vblist; vb != NULL; vb = vb->av_next)
129 i++;
130 if ((rvblist = appl_blocklist_response(i)) == NULL)
131 goto fail;
132 rvb = rvblist;
133 for (vb = vblist; vb != NULL; vb = vb->av_next, rvb = rvb->av_next) {
134 rvb->av_oid = vb->av_oid;
135 rvb->av_value = appl_exception(APPL_EXC_ENDOFMIBVIEW);
136 if (rvb->av_value == NULL)
137 goto fail;
138 }
139
140 appl_response(backend, requestid, APPL_ERROR_NOERROR, 0, rvblist);
141 return;
142 fail:
143 for (rvb = rvblist; rvb != NULL && rvb->av_value != NULL;
144 rvb = rvb->av_next)
145 ober_free_elements(rvb->av_value);
146 appl_response(backend, requestid, APPL_ERROR_GENERR, 1, vb);
147 }
148