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#ifndef _SNMP_TRANSPORT_H
#define _SNMP_TRANSPORT_H
/*
* Portions of this file are copyrighted by:
* Copyright (c) 2016 VMware, Inc. All rights reserved.
* Use is subject to license terms specified in the COPYING file
* distributed with the Net-SNMP package.
*/
#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#ifdef solaris2
#define _XPG4_2
#endif
#if defined(aix4) || defined(aix5) || defined(aix6) || defined(aix7)
#define _LINUX_SOURCE_COMPAT
#endif
#include <sys/socket.h>
#ifdef solaris2
# ifndef CMSG_SPACE
# define CMSG_SPACE(l) \
((unsigned int)_CMSG_HDR_ALIGN(sizeof (struct cmsghdr) + (l)))
# define CMSG_LEN(l) (_CMSG_HDR_ALIGN(sizeof(struct cmsghdr)) + (l))
# endif
#endif
#endif /* HAVE_SYS_SOCKET_H */
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <net-snmp/library/asn1.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Some transport-type constants. */
#ifndef NETSNMP_STREAM_QUEUE_LEN
#define NETSNMP_STREAM_QUEUE_LEN 5
#endif
/* Some transport-type flags. */
#define NETSNMP_TRANSPORT_FLAG_STREAM 0x01
#define NETSNMP_TRANSPORT_FLAG_LISTEN 0x02
#define NETSNMP_TRANSPORT_FLAG_TUNNELED 0x04
#define NETSNMP_TRANSPORT_FLAG_TMSTATE 0x08 /* indicates opaque is a
TSM tmStateReference */
#define NETSNMP_TRANSPORT_FLAG_EMPTY_PKT 0x10
#define NETSNMP_TRANSPORT_FLAG_OPENED 0x20 /* f_open called */
#define NETSNMP_TRANSPORT_FLAG_SHARED 0x40
#define NETSNMP_TRANSPORT_FLAG_HOSTNAME 0x80 /* for fmtaddr hook */
/* The standard SNMP domains. */
NETSNMP_IMPORT oid netsnmpUDPDomain[]; /* = { 1, 3, 6, 1, 6, 1, 1 }; */
NETSNMP_IMPORT oid netsnmpCLNSDomain[]; /* = { 1, 3, 6, 1, 6, 1, 2 }; */
NETSNMP_IMPORT oid netsnmpCONSDomain[]; /* = { 1, 3, 6, 1, 6, 1, 3 }; */
NETSNMP_IMPORT oid netsnmpDDPDomain[]; /* = { 1, 3, 6, 1, 6, 1, 4 }; */
NETSNMP_IMPORT oid netsnmpIPXDomain[]; /* = { 1, 3, 6, 1, 6, 1, 5 }; */
NETSNMP_IMPORT size_t netsnmpUDPDomain_len;
NETSNMP_IMPORT size_t netsnmpCLNSDomain_len;
NETSNMP_IMPORT size_t netsnmpCONSDomain_len;
NETSNMP_IMPORT size_t netsnmpDDPDomain_len;
NETSNMP_IMPORT size_t netsnmpIPXDomain_len;
/* Structure which stores transport security model specific parameters */
/* isms-secshell-11 section 4.1 */
/* contents documented in draft-ietf-isms-transport-security-model
Section 3.2 */
/* note: VACM only allows <= 32 so this is overkill till another ACM comes */
#define NETSNMP_TM_MAX_SECNAME 256
typedef union netsnmp_sockaddr_storage_u {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef NETSNMP_ENABLE_IPV6
struct sockaddr_in6 sin6;
#endif
} netsnmp_sockaddr_storage;
typedef struct netsnmp_addr_pair_s {
netsnmp_sockaddr_storage remote_addr;
netsnmp_sockaddr_storage local_addr;
} netsnmp_addr_pair;
typedef struct netsnmp_indexed_addr_pair_s {
netsnmp_sockaddr_storage remote_addr;
netsnmp_sockaddr_storage local_addr;
int if_index;
} netsnmp_indexed_addr_pair;
typedef struct netsnmp_tmStateReference_s {
oid transportDomain[MAX_OID_LEN];
size_t transportDomainLen;
char securityName[NETSNMP_TM_MAX_SECNAME];
size_t securityNameLen;
int requestedSecurityLevel;
int transportSecurityLevel;
char sameSecurity;
char sessionID[8];
char have_addresses;
netsnmp_indexed_addr_pair addresses;
void *otherTransportOpaque; /* XXX: May have mem leak issues */
} netsnmp_tmStateReference;
#define NETSNMP_TSPEC_LOCAL 0x01 /* 1=server, 0=client */
#define NETSNMP_TSPEC_SHARED 0x02
#define NETSNMP_TSPEC_NO_DFTL_CLIENT_ADDR 0x04
struct netsnmp_container_s; /* forward decl */
typedef struct netsnmp_tdomain_spec_s {
const char *application; /* application name */
const char *target; /* target as string */
u_int flags;
const char *default_domain; /* default domain */
const char *default_target; /* default target */
const char *source; /* source as string iff remote */
struct netsnmp_container_s *transport_config; /* extra config */
} netsnmp_tdomain_spec;
/* Structure which defines the transport-independent API. */
struct snmp_session;
typedef struct netsnmp_transport_s {
/* The transport domain object identifier. */
const oid *domain;
int domain_length; /* In sub-IDs, not octets. */
/* Local transport address (in relevant SNMP-style encoding). */
void *local;
int local_length; /* In octets. */
/* Remote transport address (in relevant SNMP-style encoding). */
void *remote;
int remote_length; /* In octets. */
/* The actual socket. */
int sock;
/* Flags (see #definitions above). */
unsigned int flags;
/* Protocol-specific opaque data pointer. */
void *data;
int data_length;
/* Maximum size of PDU that can be sent/received by this transport. */
size_t msgMaxSize;
#ifdef FOR_STANDARDS_COMPLIANCE_OR_FUTURE_USE
/* TM state reference per ISMS WG solution */
netsnmp_tmStateReference *tmStateRef;
#endif
/* tunneled transports */
struct netsnmp_transport_s * base_transport;
/* Callbacks. Arguments are:
*
* "this" pointer, fd, buf, size, *opaque, *opaque_length
*/
int (*f_recv) (struct netsnmp_transport_s *, void *,
int, void **, int *);
int (*f_send) (struct netsnmp_transport_s *, const void *,
int, void **, int *);
int (*f_close) (struct netsnmp_transport_s *);
/* Optional: opening can occur during creation if more appropriate */
struct netsnmp_transport_s * (*f_open) (struct netsnmp_transport_s *);
/* This callback is only necessary for stream-oriented transports. */
int (*f_accept) (struct netsnmp_transport_s *);
/* Optional callback to format a transport address. */
char *(*f_fmtaddr)(struct netsnmp_transport_s *, const void *,
int);
/* Optional callback to support extra configuration token/value pairs */
/* return non-zero on error */
int (*f_config)(struct netsnmp_transport_s *, const char *,
const char *);
/* Optional callback that is called after the first transport is
cloned to the second */
int (*f_copy)(const struct netsnmp_transport_s *,
struct netsnmp_transport_s *);
/* Setup initial session config if special things are needed */
int (*f_setup_session)(struct netsnmp_transport_s *,
struct snmp_session *);
/* allocated host name identifier; used by configuration system
to load localhost.conf for host-specific configuration */
u_char *identifier; /* udp:localhost:161 -> "localhost" */
/* Duplicate the remote address in the format required by SNMP-TARGET-MIB */
void (*f_get_taddr)(struct netsnmp_transport_s *t,
void **addr, size_t *addr_len);
} netsnmp_transport;
typedef struct netsnmp_transport_list_s {
netsnmp_transport *transport;
struct netsnmp_transport_list_s *next;
} netsnmp_transport_list;
typedef struct netsnmp_tdomain_s {
const oid *name;
size_t name_length;
const char **prefix;
/*
* The f_create_from_tstring and f_create_from_tstring_new fields are
* deprecated, please do not use them for new code and try to migrate
* old code away from using them.
*/
netsnmp_transport *(*f_create_from_tstring) (const char *, int);
/* @o and @o_len define an address in the format used by SNMP-TARGET-MIB */
netsnmp_transport *(*f_create_from_ostring) (const void *o, size_t o_len,
int local);
struct netsnmp_tdomain_s *next;
/** deprecated, please do not use it */
netsnmp_transport *(*f_create_from_tstring_new) (const char *, int,
const char*);
netsnmp_transport *(*f_create_from_tspec) (netsnmp_tdomain_spec *);
} netsnmp_tdomain;
void init_snmp_transport(void);
void shutdown_snmp_transport(void);
/* Some utility functions. */
char *netsnmp_transport_peer_string(netsnmp_transport *t, const void *data,
int len);
int netsnmp_transport_send(netsnmp_transport *t, const void *data, int len,
void **opaque, int *olength);
int netsnmp_transport_recv(netsnmp_transport *t, void *data, int len,
void **opaque, int *olength);
int netsnmp_transport_add_to_list(netsnmp_transport_list **transport_list,
netsnmp_transport *transport);
int netsnmp_transport_remove_from_list(netsnmp_transport_list **transport_list,
netsnmp_transport *transport);
int netsnmp_sockaddr_size(const struct sockaddr *sa);
/*
* Return an exact (deep) copy of t, or NULL if there is a memory allocation
* problem (for instance).
*/
netsnmp_transport *netsnmp_transport_copy(const netsnmp_transport *t);
/* Free an netsnmp_transport. */
NETSNMP_IMPORT
void netsnmp_transport_free(netsnmp_transport *t);
#ifndef FEATURE_REMOVE_TRANSPORT_CACHE
/** transport cache support */
NETSNMP_IMPORT
netsnmp_transport *netsnmp_transport_cache_get(int af, int type, int local,
const netsnmp_sockaddr_storage *bind_addr);
NETSNMP_IMPORT
int netsnmp_transport_cache_save(int af, int type, int local,
const netsnmp_sockaddr_storage *addr,
netsnmp_transport *t);
NETSNMP_IMPORT
int netsnmp_transport_cache_remove(netsnmp_transport *t);
#endif /* FEATURE_REMOVE_TRANSPORT_CACHE */
/*
* If the passed oid (in_oid, in_len) corresponds to a supported transport
* domain, return 1; if not return 0. If out_oid is not NULL and out_len is
* not NULL, then the "internal" oid which should be used to identify this
* domain (e.g. in pdu->tDomain etc.) is written to *out_oid and its length to
* *out_len.
*/
NETSNMP_IMPORT
int netsnmp_tdomain_support(const oid *in_oid, size_t in_len,
const oid **out_oid, size_t *out_len);
int netsnmp_tdomain_register(netsnmp_tdomain *domain);
int netsnmp_tdomain_unregister(netsnmp_tdomain *domain);
NETSNMP_IMPORT
void netsnmp_clear_tdomain_list(void);
void netsnmp_tdomain_init(void);
NETSNMP_IMPORT
netsnmp_transport *netsnmp_tdomain_transport(const char *str,
int local,
const char *default_domain);
NETSNMP_IMPORT
netsnmp_transport *netsnmp_tdomain_transport_full(const char *application,
const char *str,
int local,
const char *default_domain,
const char *default_target);
NETSNMP_IMPORT
netsnmp_transport *netsnmp_tdomain_transport_oid(const oid * dom,
size_t dom_len,
const u_char * o,
size_t o_len,
int local);
NETSNMP_IMPORT
netsnmp_transport *netsnmp_tdomain_transport_tspec(netsnmp_tdomain_spec *tspec);
NETSNMP_IMPORT
netsnmp_transport*
netsnmp_transport_open_client(const char* application, const char* str);
NETSNMP_IMPORT
netsnmp_transport*
netsnmp_transport_open_server(const char* application, const char* str);
netsnmp_transport*
netsnmp_transport_open(const char* application, const char* str, int local);
typedef struct netsnmp_transport_config_s {
char *key;
char *value;
} netsnmp_transport_config;
NETSNMP_IMPORT
int netsnmp_transport_config_compare(netsnmp_transport_config *left,
netsnmp_transport_config *right);
NETSNMP_IMPORT
netsnmp_transport_config *netsnmp_transport_create_config(char *key,
char *value);
#ifndef NETSNMP_FEATURE_REMOVE_FILTER_SOURCE
NETSNMP_IMPORT
void netsnmp_transport_parse_filterType(const char *word, char *cptr);
NETSNMP_IMPORT
int netsnmp_transport_filter_add(const char *addrtxt);
NETSNMP_IMPORT
int netsnmp_transport_filter_remove(const char *addrtxt);
NETSNMP_IMPORT
int netsnmp_transport_filter_check(const char *addrtxt);
NETSNMP_IMPORT
void netsnmp_transport_filter_cleanup(void);
#endif /* NETSNMP_FEATURE_REMOVE_FILTER_SOURCE */
#ifdef __cplusplus
}
#endif
#endif/*_SNMP_TRANSPORT_H*/
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