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msg_out.c File Reference
Functions | Variables

msg_out.c File Reference

SNMP output message processing (RFC1157). More...

Go to the source code of this file.

Functions

static u16_t snmp_resp_header_sum (struct snmp_msg_pstat *m_stat, u16_t vb_len)
 Sums response header field lengths from tail to head and returns resp_header_lengths for second encoding pass.
static u16_t snmp_trap_header_sum (struct snmp_msg_trap *m_trap, u16_t vb_len)
 Sums trap header field lengths from tail to head and returns trap_header_lengths for second encoding pass.
static u16_t snmp_varbind_list_sum (struct snmp_varbind_root *root)
 Sums varbind lengths from tail to head and annotates lengths in varbind for second encoding pass.
static u16_t snmp_resp_header_enc (struct snmp_msg_pstat *m_stat, struct pbuf *p)
 Encodes response header from head to tail.
static u16_t snmp_trap_header_enc (struct snmp_msg_trap *m_trap, struct pbuf *p)
 Encodes trap header from head to tail.
static u16_t snmp_varbind_list_enc (struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs)
 Encodes varbind list from head to tail.
void snmp_trap_dst_enable (u8_t dst_idx, u8_t enable)
 Sets enable switch for this trap destination.
void snmp_trap_dst_ip_set (u8_t dst_idx, ip_addr_t *dst)
 Sets IPv4 address for this trap destination.
err_t snmp_send_response (struct snmp_msg_pstat *m_stat)
 Sends a 'getresponse' message to the request originator.
err_t snmp_send_trap (s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap)
 Sends an generic or enterprise specific trap message.

Variables

struct snmp_msg_trap trap_msg
 TRAP message structure.

Detailed Description

SNMP output message processing (RFC1157).

Output responses and traps are build in two passes:

Pass 0: iterate over the output message backwards to determine encoding lengths Pass 1: the actual forward encoding of internal form into ASN1

The single-pass encoding method described by Comer & Stevens requires extra buffer space and copying for reversal of the packet. The buffer requirement can be prohibitively large for big payloads (>= 484) therefore we use the two encoding passes.

Definition in file msg_out.c.

Function Documentation

static u16_t snmp_resp_header_enc ( struct snmp_msg_pstat *  m_stat,
struct pbuf *  p 
) [static]

Encodes response header from head to tail.

Definition at line 487 of file msg_out.c.

static u16_t snmp_resp_header_sum ( struct snmp_msg_pstat *  m_stat,
u16_t  vb_len 
) [static]

Sums response header field lengths from tail to head and returns resp_header_lengths for second encoding pass.

Parameters:
vb_lenvarbind-list length
rhlpoints to returned header lengths
Returns:
the required lenght for encoding the response header

Definition at line 319 of file msg_out.c.

err_t snmp_send_response ( struct snmp_msg_pstat *  m_stat )

Sends a 'getresponse' message to the request originator.

Parameters:
m_statpoints to the current message request state source
Returns:
ERR_OK when success, ERR_MEM if we're out of memory
Note:
the caller is responsible for filling in outvb in the m_stat and provide error-status and index (except for tooBig errors) ...

connect to the originating source

disassociate remote address and port with this pcb

Definition at line 113 of file msg_out.c.

err_t snmp_send_trap ( s8_t  generic_trap,
struct snmp_obj_id *  eoid,
s32_t  specific_trap 
)

Sends an generic or enterprise specific trap message.

Parameters:
generic_trapis the trap code
eoidpoints to enterprise object identifier
specific_trapused for enterprise traps when generic_trap == 6
Returns:
ERR_OK when success, ERR_MEM if we're out of memory
Note:
the caller is responsible for filling in outvb in the trap_msg
the use of the enterpise identifier field is per RFC1215. Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps and .iso.org.dod.internet.private.enterprises.yourenterprise (sysObjectID) for specific traps.

send to the TRAP destination

Definition at line 220 of file msg_out.c.

void snmp_trap_dst_enable ( u8_t  dst_idx,
u8_t  enable 
)

Sets enable switch for this trap destination.

Parameters:
dst_idxindex in 0 .. SNMP_TRAP_DESTINATIONS-1
enableswitch if 0 destination is disabled >0 enabled.

Definition at line 81 of file msg_out.c.

void snmp_trap_dst_ip_set ( u8_t  dst_idx,
ip_addr_t *  dst 
)

Sets IPv4 address for this trap destination.

Parameters:
dst_idxindex in 0 .. SNMP_TRAP_DESTINATIONS-1
dstIPv4 address in host order.

Definition at line 95 of file msg_out.c.

static u16_t snmp_trap_header_enc ( struct snmp_msg_trap *  m_trap,
struct pbuf *  p 
) [static]

Encodes trap header from head to tail.

Definition at line 544 of file msg_out.c.

static u16_t snmp_trap_header_sum ( struct snmp_msg_trap *  m_trap,
u16_t  vb_len 
) [static]

Sums trap header field lengths from tail to head and returns trap_header_lengths for second encoding pass.

Parameters:
vb_lenvarbind-list length
thlpoints to returned header lengths
Returns:
the required lenght for encoding the trap header

Definition at line 366 of file msg_out.c.

static u16_t snmp_varbind_list_enc ( struct snmp_varbind_root *  root,
struct pbuf *  p,
u16_t  ofs 
) [static]

Encodes varbind list from head to tail.

Definition at line 615 of file msg_out.c.

static u16_t snmp_varbind_list_sum ( struct snmp_varbind_root *  root ) [static]

Sums varbind lengths from tail to head and annotates lengths in varbind for second encoding pass.

Parameters:
rootpoints to the root of the variable binding list
Returns:
the required lenght for encoding the variable bindings

Definition at line 421 of file msg_out.c.

Variable Documentation

struct snmp_msg_trap trap_msg

TRAP message structure.

Definition at line 65 of file msg_out.c.

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