1 /*
2 * agent_read_config.c
3 *
4 * Portions of this file are copyrighted by:
5 * Copyright (c) 2016 VMware, Inc. All rights reserved.
6 * Use is subject to license terms specified in the COPYING file
7 * distributed with the Net-SNMP package.
8 */
9
10 #include <net-snmp/net-snmp-config.h>
11 #include <net-snmp/net-snmp-features.h>
12
13 #if HAVE_SYS_PARAM_H
14 #include <sys/param.h>
15 #else
16 #include <sys/types.h>
17 #endif
18 #if HAVE_STDLIB_H
19 #include <stdlib.h>
20 #endif
21 #if HAVE_STRING_H
22 #include <string.h>
23 #else
24 #include <strings.h>
25 #endif
26 #include <stdio.h>
27 #include <ctype.h>
28 #include <errno.h>
29
30 #if TIME_WITH_SYS_TIME
31 # include <sys/time.h>
32 # include <time.h>
33 #else
34 # if HAVE_SYS_TIME_H
35 # include <sys/time.h>
36 # else
37 # include <time.h>
38 # endif
39 #endif
40 #if HAVE_NETINET_IN_H
41 #include <netinet/in.h>
42 #endif
43 #if HAVE_NETINET_IN_SYSTM_H
44 #include <netinet/in_systm.h>
45 #endif
46 #if HAVE_NETINET_IP_H
47 #include <netinet/ip.h>
48 #endif
49 #ifdef NETSNMP_ENABLE_IPV6
50 #if HAVE_NETINET_IP6_H
51 #include <netinet/ip6.h>
52 #endif
53 #endif
54 #if HAVE_SYS_QUEUE_H
55 #include <sys/queue.h>
56 #endif
57 #if HAVE_SYS_SOCKET_H
58 #include <sys/socket.h>
59 #if HAVE_SYS_SOCKETVAR_H
60 #ifndef dynix
61 #include <sys/socketvar.h>
62 #else
63 #include <sys/param.h>
64 #endif
65 #endif
66 #endif
67 #if HAVE_SYS_STREAM_H
68 # ifdef sysv5UnixWare7
69 # define _KMEMUSER 1 /* <sys/stream.h> needs this for queue_t */
70 # endif
71 #include <sys/stream.h>
72 #endif
73 #if HAVE_NET_ROUTE_H
74 #include <net/route.h>
75 #endif
76 #if HAVE_NETINET_IP_VAR_H
77 #include <netinet/ip_var.h>
78 #endif
79 #ifdef NETSNMP_ENABLE_IPV6
80 #if HAVE_NETNETSNMP_ENABLE_IPV6_IP6_VAR_H
81 #include <netinet6/ip6_var.h>
82 #endif
83 #endif
84 #if HAVE_NETINET_IN_PCB_H
85 #include <netinet/in_pcb.h>
86 #endif
87 #if HAVE_INET_MIB2_H
88 #include <inet/mib2.h>
89 #endif
90
91 #if HAVE_UNISTD_H
92 #include <unistd.h>
93 #endif
94 #ifdef HAVE_PWD_H
95 #include <pwd.h>
96 #endif
97 #ifdef HAVE_GRP_H
98 #include <grp.h>
99 #endif
100
101 #include <net-snmp/net-snmp-includes.h>
102 #include <net-snmp/agent/net-snmp-agent-includes.h>
103
104 #include "mibgroup/struct.h"
105 #include <net-snmp/agent/agent_trap.h>
106 #include "snmpd.h"
107 #include <net-snmp/agent/agent_callbacks.h>
108 #include <net-snmp/agent/table.h>
109 #include <net-snmp/agent/table_iterator.h>
110 #include <net-snmp/agent/table_data.h>
111 #include <net-snmp/agent/table_dataset.h>
112 #include "agent_module_includes.h"
113 #include "mib_module_includes.h"
114
115 netsnmp_feature_child_of(agent_read_config_all, libnetsnmpagent);
116
117 netsnmp_feature_child_of(snmpd_unregister_config_handler, agent_read_config_all);
118
netsnmp_set_agent_user_id(int uid)119 void netsnmp_set_agent_user_id(int uid)
120 {
121 static int agent_user_id = -1;
122
123 if (agent_user_id != -1 && uid != agent_user_id) {
124 snmp_log(LOG_ERR, "User ID has already been set -- can not change\n");
125 return;
126 }
127 agent_user_id = uid;
128 netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_USERID, uid);
129 }
130
netsnmp_set_agent_group_id(int gid)131 void netsnmp_set_agent_group_id(int gid)
132 {
133 static int agent_group_id = -1;
134
135 if (agent_group_id != -1 && gid != agent_group_id) {
136 snmp_log(LOG_ERR, "Group ID has already been set -- can not change\n");
137 return;
138 }
139 agent_group_id = gid;
140 netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_GROUPID,
141 gid);
142 }
143
144 #ifdef HAVE_UNISTD_H
145 void
netsnmp_parse_agent_user(const char * token,char * cptr)146 netsnmp_parse_agent_user(const char *token, char *cptr)
147 {
148 if (cptr[0] == '#') {
149 char *ecp;
150 int uid;
151
152 uid = strtoul(cptr + 1, &ecp, 10);
153 if (*ecp != 0) {
154 config_perror("Bad number");
155 } else {
156 netsnmp_set_agent_user_id(uid);
157 }
158 #if defined(HAVE_GETPWNAM) && defined(HAVE_PWD_H)
159 } else {
160 struct passwd *info;
161
162 info = getpwnam(cptr);
163 if (info)
164 netsnmp_set_agent_user_id(info->pw_uid);
165 else
166 config_perror("User not found in passwd database");
167 endpwent();
168 #endif
169 }
170 }
171
172 void
netsnmp_parse_agent_group(const char * token,char * cptr)173 netsnmp_parse_agent_group(const char *token, char *cptr)
174 {
175 if (cptr[0] == '#') {
176 char *ecp;
177 int gid = strtoul(cptr + 1, &ecp, 10);
178
179 if (*ecp != 0) {
180 config_perror("Bad number");
181 } else {
182 netsnmp_set_agent_group_id(gid);
183 }
184 #if defined(HAVE_GETGRNAM) && defined(HAVE_GRP_H)
185 } else {
186 struct group *info;
187
188 info = getgrnam(cptr);
189 if (info)
190 netsnmp_set_agent_group_id(info->gr_gid);
191 else
192 config_perror("Group not found in group database");
193 endgrent();
194 #endif
195 }
196 }
197 #endif
198
199 #ifndef NETSNMP_NO_LISTEN_SUPPORT
200 void
snmpd_set_agent_address(const char * token,char * cptr)201 snmpd_set_agent_address(const char *token, char *cptr)
202 {
203 char buf[SPRINT_MAX_LEN];
204 char *ptr;
205
206 /*
207 * has something been specified before?
208 */
209 ptr = netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
210 NETSNMP_DS_AGENT_PORTS);
211
212 if (ptr) {
213 /*
214 * append to the older specification string
215 */
216 snprintf(buf, sizeof(buf), "%s,%s", ptr, cptr);
217 buf[sizeof(buf) - 1] = '\0';
218 } else {
219 strlcpy(buf, cptr, sizeof(buf));
220 }
221
222 DEBUGMSGTL(("snmpd_ports", "port spec: %s\n", buf));
223 netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
224 NETSNMP_DS_AGENT_PORTS, buf);
225 }
226 #endif /* NETSNMP_NO_LISTEN_SUPPORT */
227
228 void
init_agent_read_config(const char * app)229 init_agent_read_config(const char *app)
230 {
231 if (app != NULL) {
232 netsnmp_ds_set_string(NETSNMP_DS_LIBRARY_ID,
233 NETSNMP_DS_LIB_APPTYPE, app);
234 } else {
235 app = netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
236 NETSNMP_DS_LIB_APPTYPE);
237 }
238
239 register_app_config_handler("authtrapenable",
240 snmpd_parse_config_authtrap, NULL,
241 "1 | 2\t\t(1 = enable, 2 = disable)");
242 register_app_config_handler("pauthtrapenable",
243 snmpd_parse_config_authtrap, NULL, NULL);
244
245
246 if (netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
247 NETSNMP_DS_AGENT_ROLE) == MASTER_AGENT) {
248 #ifndef NETSNMP_DISABLE_SNMPV1
249 register_app_config_handler("trapsink",
250 snmpd_parse_config_trapsink,
251 snmpd_free_trapsinks,
252 "[-profile p] [-name n] [-tag t] host [community] [port]");
253 #endif
254 #ifndef NETSNMP_DISABLE_SNMPV2C
255 register_app_config_handler("trap2sink",
256 snmpd_parse_config_trap2sink,
257 snmpd_free_trapsinks,
258 "[-profile p] [-name n] [-tag t] host [community] [port]");
259 register_app_config_handler("informsink",
260 snmpd_parse_config_informsink,
261 snmpd_free_trapsinks,
262 "[-profile p] [-name n] [-tag t] host [community] [port]");
263 #endif
264 register_app_config_handler("trapsess",
265 snmpd_parse_config_trapsess,
266 snmpd_free_trapsinks,
267 "[-profile p] [-name n] [-tag t] [snmpcmdargs] host");
268 }
269 #if !defined(NETSNMP_DISABLE_SNMPV1) || !defined(NETSNMP_DISABLE_SNMPV2C)
270 register_app_config_handler("trapcommunity",
271 snmpd_parse_config_trapcommunity,
272 snmpd_free_trapcommunity,
273 "community-string");
274 #endif /* support for community based SNMP */
275 netsnmp_ds_register_config(ASN_OCTET_STR, app, "v1trapaddress",
276 NETSNMP_DS_APPLICATION_ID,
277 NETSNMP_DS_AGENT_TRAP_ADDR);
278 #ifdef HAVE_UNISTD_H
279 register_app_config_handler("agentuser",
280 netsnmp_parse_agent_user, NULL, "userid");
281 register_app_config_handler("agentgroup",
282 netsnmp_parse_agent_group, NULL, "groupid");
283 #endif
284 #ifndef NETSNMP_NO_LISTEN_SUPPORT
285 register_app_config_handler("agentaddress",
286 snmpd_set_agent_address, NULL,
287 "SNMP bind address");
288 #endif /* NETSNMP_NO_LISTEN_SUPPORT */
289 netsnmp_ds_register_config(ASN_BOOLEAN, app, "quit",
290 NETSNMP_DS_APPLICATION_ID,
291 NETSNMP_DS_AGENT_QUIT_IMMEDIATELY);
292 netsnmp_ds_register_config(ASN_BOOLEAN, app, "leave_pidfile",
293 NETSNMP_DS_APPLICATION_ID,
294 NETSNMP_DS_AGENT_LEAVE_PIDFILE);
295 netsnmp_ds_register_config(ASN_BOOLEAN, app, "dontLogTCPWrappersConnects",
296 NETSNMP_DS_APPLICATION_ID,
297 NETSNMP_DS_AGENT_DONT_LOG_TCPWRAPPERS_CONNECTS);
298 netsnmp_ds_register_config(ASN_INTEGER, app, "maxGetbulkRepeats",
299 NETSNMP_DS_APPLICATION_ID,
300 NETSNMP_DS_AGENT_MAX_GETBULKREPEATS);
301 netsnmp_ds_register_config(ASN_INTEGER, app, "maxGetbulkResponses",
302 NETSNMP_DS_APPLICATION_ID,
303 NETSNMP_DS_AGENT_MAX_GETBULKRESPONSES);
304 netsnmp_ds_register_config(ASN_INTEGER, app, "avgBulkVarbindSize",
305 NETSNMP_DS_APPLICATION_ID,
306 NETSNMP_DS_AGENT_AVG_BULKVARBINDSIZE);
307 #ifndef NETSNMP_NO_PDU_STATS
308 netsnmp_ds_register_config(ASN_INTEGER, app, "pduStatsMax",
309 NETSNMP_DS_APPLICATION_ID,
310 NETSNMP_DS_AGENT_PDU_STATS_MAX);
311 netsnmp_ds_register_config(ASN_INTEGER, app, "pduStatsThreshold",
312 NETSNMP_DS_APPLICATION_ID,
313 NETSNMP_DS_AGENT_PDU_STATS_THRESHOLD);
314 #endif /* NETSNMP_NO_PDU_STATS */
315
316 netsnmp_init_handler_conf();
317
318 #include "agent_module_dot_conf.h"
319 #include "mib_module_dot_conf.h"
320 #ifdef TESTING
321 print_config_handlers();
322 #endif
323 }
324
325 void
update_config(void)326 update_config(void)
327 {
328 snmp_call_callbacks(SNMP_CALLBACK_APPLICATION,
329 SNMPD_CALLBACK_PRE_UPDATE_CONFIG, NULL);
330 free_config();
331 read_configs();
332 }
333
334
335 void
snmpd_register_config_handler(const char * token,void (* parser)(const char *,char *),void (* releaser)(void),const char * help)336 snmpd_register_config_handler(const char *token,
337 void (*parser) (const char *, char *),
338 void (*releaser) (void), const char *help)
339 {
340 DEBUGMSGTL(("snmpd_register_app_config_handler",
341 "registering .conf token for \"%s\"\n", token));
342 register_app_config_handler(token, parser, releaser, help);
343 }
344
345 void
snmpd_register_const_config_handler(const char * token,void (* parser)(const char *,const char *),void (* releaser)(void),const char * help)346 snmpd_register_const_config_handler(const char *token,
347 void (*parser) (const char *, const char *),
348 void (*releaser) (void), const char *help)
349 {
350 DEBUGMSGTL(("snmpd_register_app_config_handler",
351 "registering .conf token for \"%s\"\n", token));
352 register_app_config_handler(token, (void(*)(const char *, char *))parser,
353 releaser, help);
354 }
355
356 #ifdef NETSNMP_FEATURE_REQUIRE_SNMPD_UNREGISTER_CONFIG_HANDLER
357 netsnmp_feature_require(unregister_app_config_handler);
358 #endif /* NETSNMP_FEATURE_REQUIRE_SNMPD_UNREGISTER_CONFIG_HANDLER */
359
360 #ifndef NETSNMP_FEATURE_REMOVE_SNMPD_UNREGISTER_CONFIG_HANDLER
361 void
snmpd_unregister_config_handler(const char * token)362 snmpd_unregister_config_handler(const char *token)
363 {
364 unregister_app_config_handler(token);
365 }
366 #endif /* NETSNMP_FEATURE_REMOVE_SNMPD_UNREGISTER_CONFIG_HANDLER */
367
368 /*
369 * this function is intended for use by mib-modules to store permenant
370 * configuration information generated by sets or persistent counters
371 */
372 void
snmpd_store_config(const char * line)373 snmpd_store_config(const char *line)
374 {
375 read_app_config_store(line);
376 }
377