Net-SNMP-XS/XS.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

// C99 required

#define ASN_BOOLEAN           0x01
#define ASN_INTEGER32         0x02
#define ASN_OCTET_STRING      0x04
#define ASN_NULL              0x05
#define ASN_OBJECT_IDENTIFIER 0x06
#define ASN_SEQUENCE          0x30
#define ASN_IPADDRESS         0x40
#define ASN_COUNTER32         0x41
#define ASN_UNSIGNED32        0x42
#define ASN_TIMETICKS         0x43
#define ASN_OPAQUE            0x44
#define ASN_COUNTER64         0x46

#define BENCHMARK

#define MAX_OID_STRLEN 4096

static SV *msg;
static int errflag, leading_dot;
static U8 *buf, *cur;
static STRLEN len, rem;

static SV *
x_get_cv (SV *cb_sv)
{
  HV *st;
  GV *gvp;
  CV *cv = sv_2cv (cb_sv, &st, &gvp, 0);

  if (!cv)
    croak ("CODE reference expected");

  return (SV *)cv;
}

static void
error (const char *msg)
{
  errflag = 1;

  printf ("<<<%s>>>\n", msg);//D
}

static int
need (int count)
{
  if (count < 0 || (int)rem < count)
    {
      error ("Unexpected end of message buffer");
      return 0;
    }

  return 1;
}

static U8 *
getn (int count, const U8 *errres)
{
  if (!need (count))
    return (U8 *)errres;

  U8 *res = cur;

  cur += count;
  rem -= count;

  return res;
}

static U8
get8 (void)
{
  if (rem <= 0)
    {
      error ("Unexpected end of message buffer");
      return 0;
    }

  rem--;
  return *cur++;
}

static U32
getb (void)
{
  U32 res = 0;

  for (;;)
    {
      U8 c = get8 ();
      res = (res << 7) | (c & 0x7f);

      if (!(c & 0x80))
        return res;
    }
}

#ifdef BENCHMARK
static double t1;

static double
tstamp (void)
{
  struct timeval tv;
  gettimeofday (&tv, 0);
  return tv.tv_sec + tv.tv_usec * 0.000001;
}
#endif

static U32
process_length (void)
{
  U32 res = get8 ();

  if (res & 0x80)
    {
      int cnt = res & 0x7f;
      res = 0;

      switch (cnt)
        {
          case 0:
            error ("Indefinite ASN.1 lengths not supported");
            return 0;

          default:
            error ("ASN.1 length too long");
            return 0;

          case 4: res = (res << 8) | get8 ();
          case 3: res = (res << 8) | get8 ();
          case 2: res = (res << 8) | get8 ();
          case 1: res = (res << 8) | get8 ();
        }
    }

  return res;
}

static U32
process_integer32 (void)
{
  U32 length = process_length ();

  if (length <= 0)
    {
      error ("INTEGER32 length equal to zero");
      return 0;
    }

  U8 *data = getn (length, 0);

  if (!data)
    return 0;

  if (length > 5 || (length > 4 && data [0]))
    {
      error ("INTEGER32 length too long");
      return 0;
    }

  U32 res = data [0] & 0x80 ? 0xffffffff : 0;

  while (length--)
    res = (res << 8) | *data++;

  return res;
}

static SV *
process_integer32_sv (void)
{
  return newSViv ((I32)process_integer32 ());
}

static SV *
process_unsigned32_sv (void)
{
  return newSVuv ((U32)process_integer32 ());
}

static SV *
process_octet_string_sv (void)
{
  U32 length = process_length ();

  U8 *data = getn (length, 0);
  if (!data)
    {
      error ("OCTET STRING too long");
      return &PL_sv_undef;
    }

  return newSVpvn (data, length);
}
static SV *
process_object_identifier_sv (void)
{
  U32 length = process_length ();

  if (length <= 0)
    {
      error ("OBJECT IDENTIFIER length equal to zero");
      return &PL_sv_undef;
    }

  U8 *end = cur + length;
  U32 w = getb ();

  static char oid[MAX_OID_STRLEN];
  char *buf = oid;

  if (leading_dot)
    *buf++ = '.';

  buf += snprintf (buf, oid + sizeof (oid) - buf, "%d.%d", (int)w / 40, (int)w % 40);

  while (cur < end)
    {
      w = getb ();
      buf += snprintf (buf, oid + sizeof (oid) - buf, ".%u", (unsigned int)w);
    }

  return newSVpvn (oid, buf - oid);
}

static AV *av_type;

MODULE = Net::SNMP::XS          PACKAGE = Net::SNMP::XS

PROTOTYPES: ENABLE

BOOT:
        av_type = newAV ();

void
set_type (int type, SV *cv)
        CODE:
        av_store (av_type, type, SvREFCNT_inc (x_get_cv (cv)));

void
set_msg (SV *msg_, SV *buf_)
        CODE:
        errflag     = 0;
        leading_dot = -1;
        msg         = SvREFCNT_inc (msg_);
        buf         = SvPVbyte (buf_, len);
        cur         = buf;
        rem         = len;
#ifdef BENCHMARK
        t1          = tstamp ();
#endif

void
clr_msg ()
        CODE:
        SvREFCNT_dec (msg);
        buf = cur = "";
        len = rem = 0;
#ifdef BENCHMARK
        printf ("%f\n", tstamp () - t1);//D
#endif

MODULE = Net::SNMP::XS          PACKAGE = Net::SNMP::Message

void
_buffer_get (SV *self, int count = -1)
        PPCODE:
{
        // grrr.
        if (count < 0)
          {
            hv_delete ((HV *)SvRV (self), "_index" , 6, G_DISCARD);
            hv_delete ((HV *)SvRV (self), "_length", 7, G_DISCARD);
            SV **svp = hv_fetch ((HV *)SvRV (self), "_buffer", 7, 1);
            XPUSHs (sv_2mortal (newSVsv (*svp)));
            sv_setpvn (*svp, "", 0);
            XSRETURN (1);
          }

        char *data = getn (count, 0);

        if (data)
          XPUSHs (sv_2mortal (newSVpvn (data, count)));
}

U32
index (SV *self, int ndx = -1)
        CODE:
{
        if (ndx >= 0 && ndx < len)
          {
            cur = buf + ndx;
            rem = len - ndx;
          }

        RETVAL = cur - buf;
}
        OUTPUT:
        RETVAL

U32
_process_length (SV *self, ...)
        ALIAS:
        _process_sequence = 0
        CODE:
        RETVAL = process_length ();
        OUTPUT:
        RETVAL

SV *
_process_integer32 (SV *self, ...)
        CODE:
        RETVAL = process_integer32_sv ();
        OUTPUT:
        RETVAL

SV *
_process_counter (SV *self, ...)
        ALIAS:
        _process_gauge     = 0
        _process_timeticks = 0
        CODE:
        RETVAL = process_unsigned32_sv ();
        OUTPUT:
        RETVAL

SV *
_process_object_identifier (SV *self, ...)
        CODE:
        RETVAL = process_object_identifier_sv ();
        OUTPUT:
        RETVAL

SV *
_process_octet_string (SV *self, ...)
        ALIAS:
        _process_opaque = 0
        CODE:
        RETVAL = process_octet_string_sv ();
        OUTPUT:
        RETVAL

SV *
_process_ipaddress (SV *self, ...)
        CODE:
{
        U32 length = process_length ();
        if (length != 4)
          {
            error ("IP ADDRESS length not four");
            XSRETURN_UNDEF;
          }

        U8 *data = getn (4, "\x00\x00\x00\x00");
        RETVAL = newSVpvf ("%d.%d.%d.%d", data [0], data [1], data [2], data [3]);
}
        OUTPUT:
        RETVAL

SV *
process (SV *self, SV *expected = 0, SV *found = 0)
        PPCODE:
{
        U8 type = get8 ();

        if (expected && SvOK (expected) && type != SvIV (expected))
          {
            error ("Expected a different type than found");
            XSRETURN_UNDEF;
          }

        if (type > AvFILLp (av_type) || !SvTYPE (AvARRAY (av_type)[type]) == SVt_PVCV)
          {
            sv_dump (AvARRAY (av_type)[type]);//D
            error ("Unknown ASN.1 type");
            XSRETURN_UNDEF;
          }

        if (found)
          sv_setiv (found, type);

        //TODO: switch based on type, to avoid calling overhead
        SV *res;

        switch (type)
          {
            case ASN_OBJECT_IDENTIFIER:
              res = sv_2mortal (process_object_identifier_sv ());
              break;

            case ASN_INTEGER32:
              res = sv_2mortal (process_integer32_sv ());
              break;

            case ASN_UNSIGNED32:
            case ASN_COUNTER32:
            case ASN_TIMETICKS:
              res = sv_2mortal (process_unsigned32_sv ());
              break;

            case ASN_SEQUENCE:
              res = sv_2mortal (newSVuv (process_length ()));
              break;

            case ASN_OCTET_STRING:
            case ASN_OPAQUE:
              res = sv_2mortal (process_octet_string_sv ());
              break;

            default:
              {
                dSP;
                PUSHMARK (SP);
                EXTEND (SP, 2);
                PUSHs (self);
                PUSHs (expected);
                PUTBACK;
                int count = call_sv (AvARRAY (av_type)[type], G_SCALAR);
                SPAGAIN;
                res = count ? TOPs : &PL_sv_undef;
              }
          }

        XPUSHs (errflag ? &PL_sv_undef : res);
}

#if 0

MODULE = Net::SNMP::XS          PACKAGE = Net::SNMP::PDU

SV *
_process_var_bind_list (SV *self)
        CODE:
{
        # VarBindList::=SEQUENCE
        if (!defined($value = $this->process(SEQUENCE))) {
           return $this->_error;
        }
        
        # Using the length of the VarBindList SEQUENCE, 
        # calculate the end index.
        
        my $end = $this->index + $value;
        
        $this->{_var_bind_list}  = {};
        $this->{_var_bind_names} = [];
        $this->{_var_bind_types} = {};
        
        my ($oid, $type);
        
        while ($this->index < $end) {
        
           # VarBind::=SEQUENCE
           if (!defined($this->process(SEQUENCE))) {
              return $this->_error;
           }
           # name::=ObjectName
           if (!defined($oid = $this->process(OBJECT_IDENTIFIER))) {
              return $this->_error;
           }
           # value::=ObjectSyntax
           if (!defined($value = $this->process(undef, $type))) {
              return $this->_error;
           }
        
           # Create a hash consisting of the OBJECT IDENTIFIER as a
           # key and the ObjectSyntax as the value.  If there is a
           # duplicate OBJECT IDENTIFIER in the VarBindList, we pad
           # that OBJECT IDENTIFIER with spaces to make a unique
           # key in the hash.
        
           while (exists($this->{_var_bind_list}->{$oid})) {
              $oid .= ' '; # Pad with spaces
           }
        
           DEBUG_INFO('{ %s => %s: %s }', $oid, asn1_itoa($type), $value);
           $this->{_var_bind_list}->{$oid}  = $value;
           $this->{_var_bind_types}->{$oid} = $type;
        
           # Create an array with the ObjectName OBJECT IDENTIFIERs
           # so that the order in which the VarBinds where encoded
           # in the PDU can be retrieved later.
        
           push(@{$this->{_var_bind_names}}, $oid);
        
        }
        
        # Return an error based on the contents of the VarBindList
        # if we received a Report-PDU.
        
        return $this->_report_pdu_error if ($this->{_pdu_type} == REPORT);
        
        # Return the var_bind_list hash
        $this->{_var_bind_list};
}

#endif

Revision:	1.4
Committed:	Thu Apr 9 04:37:05 2009 UTC (15 years, 2 months ago) by root
Branch:	MAIN
Changes since 1.3:	+234 -103 lines
Log Message:	* empty log message *
#	Content
1	#include "EXTERN.h"
2	#include "perl.h"
3	#include "XSUB.h"
4
5	// C99 required
6
7	#define ASN_BOOLEAN 0x01
8	#define ASN_INTEGER32 0x02
9	#define ASN_OCTET_STRING 0x04
10	#define ASN_NULL 0x05
11	#define ASN_OBJECT_IDENTIFIER 0x06
12	#define ASN_SEQUENCE 0x30
13	#define ASN_IPADDRESS 0x40
14	#define ASN_COUNTER32 0x41
15	#define ASN_UNSIGNED32 0x42
16	#define ASN_TIMETICKS 0x43
17	#define ASN_OPAQUE 0x44
18	#define ASN_COUNTER64 0x46
19
20	#define BENCHMARK
21
22	#define MAX_OID_STRLEN 4096
23
24	static SV *msg;
25	static int errflag, leading_dot;
26	static U8 buf, cur;
27	static STRLEN len, rem;
28
29	static SV *
30	x_get_cv (SV *cb_sv)
31	{
32	HV *st;
33	GV *gvp;
34	CV *cv = sv_2cv (cb_sv, &st, &gvp, 0);
35
36	if (!cv)
37	croak ("CODE reference expected");
38
39	return (SV *)cv;
40	}
41
42	static void
43	error (const char *msg)
44	{
45	errflag = 1;
46
47	printf ("<<<%s>>>\n", msg);//D
48	}
49
50	static int
51	need (int count)
52	{
53	if (count < 0 \|\| (int)rem < count)
54	{
55	error ("Unexpected end of message buffer");
56	return 0;
57	}
58
59	return 1;
60	}
61
62	static U8 *
63	getn (int count, const U8 *errres)
64	{
65	if (!need (count))
66	return (U8 *)errres;
67
68	U8 *res = cur;
69
70	cur += count;
71	rem -= count;
72
73	return res;
74	}
75
76	static U8
77	get8 (void)
78	{
79	if (rem <= 0)
80	{
81	error ("Unexpected end of message buffer");
82	return 0;
83	}
84
85	rem--;
86	return *cur++;
87	}
88
89	static U32
90	getb (void)
91	{
92	U32 res = 0;
93
94	for (;;)
95	{
96	U8 c = get8 ();
97	res = (res << 7) \| (c & 0x7f);
98
99	if (!(c & 0x80))
100	return res;
101	}
102	}
103
104	#ifdef BENCHMARK
105	static double t1;
106
107	static double
108	tstamp (void)
109	{
110	struct timeval tv;
111	gettimeofday (&tv, 0);
112	return tv.tv_sec + tv.tv_usec * 0.000001;
113	}
114	#endif
115
116	static U32
117	process_length (void)
118	{
119	U32 res = get8 ();
120
121	if (res & 0x80)
122	{
123	int cnt = res & 0x7f;
124	res = 0;
125
126	switch (cnt)
127	{
128	case 0:
129	error ("Indefinite ASN.1 lengths not supported");
130	return 0;
131
132	default:
133	error ("ASN.1 length too long");
134	return 0;
135
136	case 4: res = (res << 8) \| get8 ();
137	case 3: res = (res << 8) \| get8 ();
138	case 2: res = (res << 8) \| get8 ();
139	case 1: res = (res << 8) \| get8 ();
140	}
141	}
142
143	return res;
144	}
145
146	static U32
147	process_integer32 (void)
148	{
149	U32 length = process_length ();
150
151	if (length <= 0)
152	{
153	error ("INTEGER32 length equal to zero");
154	return 0;
155	}
156
157	U8 *data = getn (length, 0);
158
159	if (!data)
160	return 0;
161
162	if (length > 5 \|\| (length > 4 && data [0]))
163	{
164	error ("INTEGER32 length too long");
165	return 0;
166	}
167
168	U32 res = data [0] & 0x80 ? 0xffffffff : 0;
169
170	while (length--)
171	res = (res << 8) \| *data++;
172
173	return res;
174	}
175
176	static SV *
177	process_integer32_sv (void)
178	{
179	return newSViv ((I32)process_integer32 ());
180	}
181
182	static SV *
183	process_unsigned32_sv (void)
184	{
185	return newSVuv ((U32)process_integer32 ());
186	}
187
188	static SV *
189	process_octet_string_sv (void)
190	{
191	U32 length = process_length ();
192
193	U8 *data = getn (length, 0);
194	if (!data)
195	{
196	error ("OCTET STRING too long");
197	return &PL_sv_undef;
198	}
199
200	return newSVpvn (data, length);
201	}
202	static SV *
203	process_object_identifier_sv (void)
204	{
205	U32 length = process_length ();
206
207	if (length <= 0)
208	{
209	error ("OBJECT IDENTIFIER length equal to zero");
210	return &PL_sv_undef;
211	}
212
213	U8 *end = cur + length;
214	U32 w = getb ();
215
216	static char oid[MAX_OID_STRLEN];
217	char *buf = oid;
218
219	if (leading_dot)
220	*buf++ = '.';
221
222	buf += snprintf (buf, oid + sizeof (oid) - buf, "%d.%d", (int)w / 40, (int)w % 40);
223
224	while (cur < end)
225	{
226	w = getb ();
227	buf += snprintf (buf, oid + sizeof (oid) - buf, ".%u", (unsigned int)w);
228	}
229
230	return newSVpvn (oid, buf - oid);
231	}
232
233	static AV *av_type;
234
235	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::XS
236
237	PROTOTYPES: ENABLE
238
239	BOOT:
240	av_type = newAV ();
241
242	void
243	set_type (int type, SV *cv)
244	CODE:
245	av_store (av_type, type, SvREFCNT_inc (x_get_cv (cv)));
246
247	void
248	set_msg (SV msg_, SV buf_)
249	CODE:
250	errflag = 0;
251	leading_dot = -1;
252	msg = SvREFCNT_inc (msg_);
253	buf = SvPVbyte (buf_, len);
254	cur = buf;
255	rem = len;
256	#ifdef BENCHMARK
257	t1 = tstamp ();
258	#endif
259
260	void
261	clr_msg ()
262	CODE:
263	SvREFCNT_dec (msg);
264	buf = cur = "";
265	len = rem = 0;
266	#ifdef BENCHMARK
267	printf ("%f\n", tstamp () - t1);//D
268	#endif
269
270	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::Message
271
272	void
273	_buffer_get (SV *self, int count = -1)
274	PPCODE:
275	{
276	// grrr.
277	if (count < 0)
278	{
279	hv_delete ((HV *)SvRV (self), "_index" , 6, G_DISCARD);
280	hv_delete ((HV *)SvRV (self), "_length", 7, G_DISCARD);
281	SV *svp = hv_fetch ((HV )SvRV (self), "_buffer", 7, 1);
282	XPUSHs (sv_2mortal (newSVsv (*svp)));
283	sv_setpvn (*svp, "", 0);
284	XSRETURN (1);
285	}
286
287	char *data = getn (count, 0);
288
289	if (data)
290	XPUSHs (sv_2mortal (newSVpvn (data, count)));
291	}
292
293	U32
294	index (SV *self, int ndx = -1)
295	CODE:
296	{
297	if (ndx >= 0 && ndx < len)
298	{
299	cur = buf + ndx;
300	rem = len - ndx;
301	}
302
303	RETVAL = cur - buf;
304	}
305	OUTPUT:
306	RETVAL
307
308	U32
309	_process_length (SV *self, ...)
310	ALIAS:
311	_process_sequence = 0
312	CODE:
313	RETVAL = process_length ();
314	OUTPUT:
315	RETVAL
316
317	SV *
318	_process_integer32 (SV *self, ...)
319	CODE:
320	RETVAL = process_integer32_sv ();
321	OUTPUT:
322	RETVAL
323
324	SV *
325	_process_counter (SV *self, ...)
326	ALIAS:
327	_process_gauge = 0
328	_process_timeticks = 0
329	CODE:
330	RETVAL = process_unsigned32_sv ();
331	OUTPUT:
332	RETVAL
333
334	SV *
335	_process_object_identifier (SV *self, ...)
336	CODE:
337	RETVAL = process_object_identifier_sv ();
338	OUTPUT:
339	RETVAL
340
341	SV *
342	_process_octet_string (SV *self, ...)
343	ALIAS:
344	_process_opaque = 0
345	CODE:
346	RETVAL = process_octet_string_sv ();
347	OUTPUT:
348	RETVAL
349
350	SV *
351	_process_ipaddress (SV *self, ...)
352	CODE:
353	{
354	U32 length = process_length ();
355	if (length != 4)
356	{
357	error ("IP ADDRESS length not four");
358	XSRETURN_UNDEF;
359	}
360
361	U8 *data = getn (4, "\x00\x00\x00\x00");
362	RETVAL = newSVpvf ("%d.%d.%d.%d", data [0], data [1], data [2], data [3]);
363	}
364	OUTPUT:
365	RETVAL
366
367	SV *
368	process (SV self, SV expected = 0, SV *found = 0)
369	PPCODE:
370	{
371	U8 type = get8 ();
372
373	if (expected && SvOK (expected) && type != SvIV (expected))
374	{
375	error ("Expected a different type than found");
376	XSRETURN_UNDEF;
377	}
378
379	if (type > AvFILLp (av_type) \|\| !SvTYPE (AvARRAY (av_type)[type]) == SVt_PVCV)
380	{
381	sv_dump (AvARRAY (av_type)[type]);//D
382	error ("Unknown ASN.1 type");
383	XSRETURN_UNDEF;
384	}
385
386	if (found)
387	sv_setiv (found, type);
388
389	//TODO: switch based on type, to avoid calling overhead
390	SV *res;
391
392	switch (type)
393	{
394	case ASN_OBJECT_IDENTIFIER:
395	res = sv_2mortal (process_object_identifier_sv ());
396	break;
397
398	case ASN_INTEGER32:
399	res = sv_2mortal (process_integer32_sv ());
400	break;
401
402	case ASN_UNSIGNED32:
403	case ASN_COUNTER32:
404	case ASN_TIMETICKS:
405	res = sv_2mortal (process_unsigned32_sv ());
406	break;
407
408	case ASN_SEQUENCE:
409	res = sv_2mortal (newSVuv (process_length ()));
410	break;
411
412	case ASN_OCTET_STRING:
413	case ASN_OPAQUE:
414	res = sv_2mortal (process_octet_string_sv ());
415	break;
416
417	default:
418	{
419	dSP;
420	PUSHMARK (SP);
421	EXTEND (SP, 2);
422	PUSHs (self);
423	PUSHs (expected);
424	PUTBACK;
425	int count = call_sv (AvARRAY (av_type)[type], G_SCALAR);
426	SPAGAIN;
427	res = count ? TOPs : &PL_sv_undef;
428	}
429	}
430
431	XPUSHs (errflag ? &PL_sv_undef : res);
432	}
433
434	#if 0
435
436	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::PDU
437
438	SV *
439	_process_var_bind_list (SV *self)
440	CODE:
441	{
442	# VarBindList::=SEQUENCE
443	if (!defined($value = $this->process(SEQUENCE))) {
444	return $this->_error;
445	}
446
447	# Using the length of the VarBindList SEQUENCE,
448	# calculate the end index.
449
450	my $end = $this->index + $value;
451
452	$this->{_var_bind_list} = {};
453	$this->{_var_bind_names} = [];
454	$this->{_var_bind_types} = {};
455
456	my ($oid, $type);
457
458	while ($this->index < $end) {
459
460	# VarBind::=SEQUENCE
461	if (!defined($this->process(SEQUENCE))) {
462	return $this->_error;
463	}
464	# name::=ObjectName
465	if (!defined($oid = $this->process(OBJECT_IDENTIFIER))) {
466	return $this->_error;
467	}
468	# value::=ObjectSyntax
469	if (!defined($value = $this->process(undef, $type))) {
470	return $this->_error;
471	}
472
473	# Create a hash consisting of the OBJECT IDENTIFIER as a
474	# key and the ObjectSyntax as the value. If there is a
475	# duplicate OBJECT IDENTIFIER in the VarBindList, we pad
476	# that OBJECT IDENTIFIER with spaces to make a unique
477	# key in the hash.
478
479	while (exists($this->{_var_bind_list}->{$oid})) {
480	$oid .= ' '; # Pad with spaces
481	}
482
483	DEBUG_INFO('{ %s => %s: %s }', $oid, asn1_itoa($type), $value);
484	$this->{_var_bind_list}->{$oid} = $value;
485	$this->{_var_bind_types}->{$oid} = $type;
486
487	# Create an array with the ObjectName OBJECT IDENTIFIERs
488	# so that the order in which the VarBinds where encoded
489	# in the PDU can be retrieved later.
490
491	push(@{$this->{_var_bind_names}}, $oid);
492
493	}
494
495	# Return an error based on the contents of the VarBindList
496	# if we received a Report-PDU.
497
498	return $this->_report_pdu_error if ($this->{_pdu_type} == REPORT);
499
500	# Return the var_bind_list hash
501	$this->{_var_bind_list};
502	}
503
504	#endif
505