00001 #include <net-snmp/net-snmp-config.h>
00002 
00003 #include <stdio.h>
00004 #include <sys/types.h>
00005 #include <errno.h>
00006 
00007 #if HAVE_STRING_H
00008 #include <string.h>
00009 #else
00010 #include <strings.h>
00011 #endif
00012 #if HAVE_STDLIB_H
00013 #include <stdlib.h>
00014 #endif
00015 #if HAVE_UNISTD_H
00016 #include <unistd.h>
00017 #endif
00018 
00019 #if HAVE_DMALLOC_H
00020 #include <dmalloc.h>
00021 #endif
00022 
00023 #include <net-snmp/types.h>
00024 #include <net-snmp/output_api.h>
00025 #include <net-snmp/utilities.h>
00026 #include <net-snmp/config_api.h>
00027 
00028 #include <net-snmp/library/snmp_transport.h>
00029 
00030 oid netsnmp_snmpALIASDomain[] = { 1,3,6,1,4,1,8072,3,3,7 };
00031 static netsnmp_tdomain aliasDomain;
00032 
00033 /* simple storage mechanism */
00034 static netsnmp_data_list *alias_memory = NULL;
00035 
00036 /* An alias parser */
00037 void
00038 parse_alias_config(const char *token, char *line) {
00039     char aliasname[SPRINT_MAX_LEN];
00040     char transportdef[SPRINT_MAX_LEN];
00041     /* copy the first word (the alias) out and then assume the rest is
00042        transport */
00043     line = copy_nword(line, aliasname, sizeof(aliasname));
00044     line = copy_nword(line, transportdef, sizeof(transportdef));
00045     if (line)
00046         config_perror("more data than expected");
00047     netsnmp_data_list_add_node(&alias_memory,
00048                                netsnmp_create_data_list(aliasname,
00049                                                         strdup(transportdef),
00050                                                         &free));
00051 }
00052 
00053 void
00054 free_alias_config(void) {
00055     netsnmp_free_all_list_data(alias_memory);
00056     alias_memory = NULL;
00057 }
00058 
00059 /*
00060  * Open a ALIAS-based transport for SNMP.  Local is TRUE if addr is the local
00061  * address to bind to (i.e. this is a server-type session); otherwise addr is 
00062  * the remote address to send things to.  
00063  */
00064 
00065 netsnmp_transport *
00066 netsnmp_alias_create_tstring(const char *str, int local,
00067                            const char *default_target)
00068 {
00069     const char *aliasdata;
00070 
00071     aliasdata = (const char*)netsnmp_get_list_data(alias_memory, str);
00072     if (!aliasdata) {
00073         snmp_log(LOG_ERR, "No alias found for %s\n", str);
00074         return NULL;
00075     }
00076 
00077     return netsnmp_tdomain_transport(aliasdata,local,default_target);
00078 }
00079 
00080 
00081 
00082 netsnmp_transport *
00083 netsnmp_alias_create_ostring(const u_char * o, size_t o_len, int local)
00084 {
00085     fprintf(stderr, "make ostring\n");
00086     return NULL;
00087 }
00088 
00089 void
00090 netsnmp_alias_ctor(void)
00091 {
00092     aliasDomain.name = netsnmp_snmpALIASDomain;
00093     aliasDomain.name_length = sizeof(netsnmp_snmpALIASDomain) / sizeof(oid);
00094     aliasDomain.prefix = (const char **)calloc(2, sizeof(char *));
00095     aliasDomain.prefix[0] = "alias";
00096 
00097     aliasDomain.f_create_from_tstring_new = netsnmp_alias_create_tstring;
00098     aliasDomain.f_create_from_ostring = netsnmp_alias_create_ostring;
00099 
00100     netsnmp_tdomain_register(&aliasDomain);
00101 
00102     register_config_handler("snmp", "alias", parse_alias_config,
00103                             free_alias_config, "NAME TRANSPORT_DEFINITION");
00104 }
snmpAliasDomain.c
