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snmp: fixed ugly inheritance implementation by aggregating the "base class" (struct mib_node) in all derived node classes to get more type-safe code

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This commit is contained in:
Dirk Ziegelmeier 2015-09-30 17:54:25 +02:00 committed by goldsimon
parent 59002d5081
commit 7962b21c00
3 changed files with 447 additions and 410 deletions
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758
src/core/snmp/mib2.c
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File diff suppressed because it is too large Load Diff

67
src/core/snmp/mib_structs.c
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@ -183,12 +183,12 @@ snmp_mib_lrn_alloc(void)
lrn = (struct mib_list_rootnode*)memp_malloc(MEMP_SNMP_ROOTNODE);
if (lrn != NULL)
{
lrn->get_object_def = noleafs_get_object_def;
lrn->get_value = noleafs_get_value;
lrn->set_test = noleafs_set_test;
lrn->set_value = noleafs_set_value;
lrn->node_type = MIB_NODE_LR;
lrn->maxlength = 0;
lrn->node.get_object_def = noleafs_get_object_def;
lrn->node.get_value = noleafs_get_value;
lrn->node.set_test = noleafs_set_test;
lrn->node.set_value = noleafs_set_value;
lrn->node.node_type = MIB_NODE_LR;
lrn->node.maxlength = 0;
lrn->head = NULL;
lrn->tail = NULL;
lrn->count = 0;
@ -469,11 +469,11 @@ snmp_search_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
/* array node (internal ROM or RAM, fixed length) */
an = (const struct mib_array_node *)node;
i = 0;
while ((i < an->maxlength) && (an->objid[i] != *ident))
while ((i < an->node.maxlength) && (an->objid[i] != *ident))
{
i++;
}
if (i < an->maxlength)
if (i < an->node.maxlength)
{
/* found it, if available proceed to child, otherwise inspect leaf */
LWIP_DEBUGF(SNMP_MIB_DEBUG,("an->objid[%"U16_F"]==%"S32_F" *ident==%"S32_F"\n",i,an->objid[i],*ident));
@ -483,7 +483,7 @@ snmp_search_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
inspect remaining instance number / table index */
np->ident_len = ident_len;
np->ident = ident;
return (const struct mib_node*)an;
return &an->node;
}
else
{
@ -530,7 +530,7 @@ snmp_search_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
{
np->ident_len = ident_len;
np->ident = ident;
return (const struct mib_node*)lrn;
return &lrn->node;
}
else
{
@ -580,7 +580,7 @@ snmp_search_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
{
np->ident_len = ident_len;
np->ident = ident;
return (const struct mib_node*)en;
return &en->node;
}
else
{
@ -606,14 +606,12 @@ snmp_search_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
}
else if (node_type == MIB_NODE_SC)
{
const mib_scalar_node *sn;
sn = (const mib_scalar_node *)node;
/* scalar node */
if ((ident_len == 1) && (*ident == 0))
{
np->ident_len = ident_len;
np->ident = ident;
return (const struct mib_node*)sn;
return node;
}
else
{
@ -659,7 +657,7 @@ empty_table(const struct mib_node *node)
{
const struct mib_array_node *an;
an = (const struct mib_array_node *)node;
if ((an->maxlength == 0) || (an->nptr == NULL))
if ((an->node.maxlength == 0) || (an->nptr == NULL))
{
empty = 1;
}
@ -702,11 +700,11 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
if (ident_len > 0)
{
i = 0;
while ((i < an->maxlength) && (an->objid[i] < *ident))
while ((i < an->node.maxlength) && (an->objid[i] < *ident))
{
i++;
}
if (i < an->maxlength)
if (i < an->node.maxlength)
{
LWIP_DEBUGF(SNMP_MIB_DEBUG,("an->objid[%"U16_F"]==%"S32_F" *ident==%"S32_F"\n",i,an->objid[i],*ident));
/* add identifier to oidret */
@ -719,15 +717,15 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
/* leaf node (e.g. in a fixed size table) */
if (an->objid[i] > *ident)
{
return (const struct mib_node*)an;
return &an->node;
}
else if ((i + 1) < an->maxlength)
else if ((i + 1) < an->node.maxlength)
{
/* an->objid[i] == *ident */
(oidret->len)--;
oidret->id[oidret->len] = an->objid[i + 1];
(oidret->len)++;
return (const struct mib_node*)an;
return &an->node;
}
else
{
@ -744,11 +742,11 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
/* non-leaf, store right child ptr and id */
LWIP_ASSERT("i < 0xff", i < 0xff);
j = i + 1;
while ((j < an->maxlength) && (empty_table(an->nptr[j])))
while ((j < an->node.maxlength) && (empty_table(an->nptr[j])))
{
j++;
}
if (j < an->maxlength)
if (j < an->node.maxlength)
{
struct nse cur_node;
cur_node.r_ptr = an->nptr[j];
@ -785,11 +783,11 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
u16_t j;
/* ident_len == 0, complete with leftmost '.thing' */
j = 0;
while ((j < an->maxlength) && empty_table(an->nptr[j]))
while ((j < an->node.maxlength) && empty_table(an->nptr[j]))
{
j++;
}
if (j < an->maxlength)
if (j < an->node.maxlength)
{
LWIP_DEBUGF(SNMP_MIB_DEBUG,("left an->objid[j]==%"S32_F"\n",an->objid[j]));
oidret->id[oidret->len] = an->objid[j];
@ -797,7 +795,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
if (an->nptr[j] == NULL)
{
/* leaf node */
return (const struct mib_node*)an;
return &an->node;
}
else
{
@ -837,7 +835,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
/* leaf node */
if (ln->objid > *ident)
{
return (const struct mib_node*)lrn;
return &lrn->node;
}
else if (ln->next != NULL)
{
@ -845,7 +843,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
(oidret->len)--;
oidret->id[oidret->len] = ln->next->objid;
(oidret->len)++;
return (const struct mib_node*)lrn;
return &lrn->node;
}
else
{
@ -915,7 +913,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
{
/* leaf node */
LWIP_DEBUGF(SNMP_MIB_DEBUG,("jn->nptr == NULL\n"));
return (const struct mib_node*)lrn;
return &lrn->node;
}
else
{
@ -961,7 +959,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
/* leaf node */
if (ex_id > *ident)
{
return (const struct mib_node*)en;
return &en->node;
}
else if ((i + 1) < len)
{
@ -970,7 +968,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
(oidret->len)--;
oidret->id[oidret->len] = ex_id;
(oidret->len)++;
return (const struct mib_node*)en;
return &en->node;
}
else
{
@ -1031,7 +1029,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
{
/* leaf node */
LWIP_DEBUGF(SNMP_MIB_DEBUG,("(ext_level + 1) == en->tree_levels\n"));
return (const struct mib_node*)en;
return &en->node;
}
else
{
@ -1042,10 +1040,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
}
else if(node_type == MIB_NODE_SC)
{
const mib_scalar_node *sn;
/* scalar node */
sn = (const mib_scalar_node *)node;
if (ident_len > 0)
{
/* at .0 */
@ -1058,7 +1053,7 @@ snmp_expand_tree(const struct mib_node *node, u8_t ident_len, s32_t *ident, stru
(oidret->len)++;
/* leaf node */
LWIP_DEBUGF(SNMP_MIB_DEBUG,("completed scalar leaf\n"));
return (const struct mib_node*)sn;
return node;
}
}
else

32
src/include/lwip/snmp_structs.h
View File

@ -128,13 +128,7 @@ typedef struct mib_node mib_scalar_node;
struct mib_array_node
{
/* inherited "base class" members */
void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
void (*get_value)(struct obj_def *od, u16_t len, void *value);
u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
void (*set_value)(struct obj_def *od, u16_t len, void *value);
u8_t node_type;
u16_t maxlength;
struct mib_node node;
/* additional struct members */
const s32_t *objid;
@ -146,13 +140,7 @@ struct mib_array_node
struct mib_ram_array_node
{
/* inherited "base class" members */
void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
void (*get_value)(struct obj_def *od, u16_t len, void *value);
u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
void (*set_value)(struct obj_def *od, u16_t len, void *value);
u8_t node_type;
u16_t maxlength;
struct mib_node node;
/* aditional struct members */
s32_t *objid;
@ -172,13 +160,7 @@ struct mib_list_node
struct mib_list_rootnode
{
/* inherited "base class" members */
void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
void (*get_value)(struct obj_def *od, u16_t len, void *value);
u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
void (*set_value)(struct obj_def *od, u16_t len, void *value);
u8_t node_type;
u16_t maxlength;
struct mib_node node;
/* additional struct members */
struct mib_list_node *head;
@ -192,13 +174,7 @@ struct mib_list_rootnode
struct mib_external_node
{
/* inherited "base class" members */
void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
void (*get_value)(struct obj_def *od, u16_t len, void *value);
u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
void (*set_value)(struct obj_def *od, u16_t len, void *value);
u8_t node_type;
u16_t maxlength;
struct mib_node node;
/* additional struct members */
/** points to an external (in memory) record of some sort of addressing