Net-SNMP-XS/XS.xs

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

// C99 required

#define BENCHMARK

#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 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 char *
write_uv (char *buf, U32 u)
{
  // the one-digit case is absolutely predominant
  if (u < 10)
    *buf++ = u + '0';
  else
    buf += sprintf (buf, "%u", (unsigned int)u);

  return buf;
}

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

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

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

  static char oid[MAX_OID_STRLEN]; // must be static
  char *app = oid;

  *app = '.'; app += ! ! leading_dot;
  app = write_uv (app, (U8)w / 40);
  *app++ = '.';
  app = write_uv (app, (U8)w % 40);

  // we assume an oid component is never > 64 bytes
  while (cur < end && oid + sizeof (oid) - app > 64)
    {
      w = getb ();
      *app++ = '.';
      app = write_uv (app, w);
    }

  return newSVpvn (oid, app - oid);
}

static AV *av_type;

static SV *
process_sv (int *found)
{
  int type = get8 ();

  *found = type;

  SV *res;

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

      case ASN_INTEGER32:
        res = process_integer32_sv ();
        break;

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

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

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

      default:
        {
          if (type > AvFILLp (av_type) || !SvTYPE (AvARRAY (av_type)[type]) == SVt_PVCV)
            {
              error ("Unknown ASN.1 type");
              return &PL_sv_undef;
            }

          dSP;
          PUSHMARK (SP);
          EXTEND (SP, 2);
          PUSHs (msg);
          PUSHs (sv_2mortal (newSViv (type)));
          PUTBACK;
          int count = call_sv (AvARRAY (av_type)[type], G_SCALAR);
          SPAGAIN;
          res = count ? SvREFCNT_inc (TOPs) : &PL_sv_undef;
        }
    }

  return errflag ? &PL_sv_undef : res;
}

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 = &PL_sv_undef, SV *found = 0)
        CODE:
{
        int type;

        RETVAL = process_sv (&type);

        if (found)
          sv_setiv (found, type);

        if (SvOK (expected) && type != SvIV (expected))
          error ("Expected a different type than found");
}
        OUTPUT:
        RETVAL

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

SV *
_process_var_bind_list (SV *self)
        CODE:
{
        if (get8 () != ASN_SEQUENCE)
          error ("SEQUENCE expected at beginning of VarBindList");
        int seqlen = process_length ();
        U8 *end = cur + seqlen;

        HV *list  = newHV ();
        AV *names = newAV ();
        HV *types = newHV ();

        hv_store ((HV *)SvRV (self), "_var_bind_list" , sizeof ("_var_bind_list" ) - 1, newRV_noinc ((SV *)list ), 0);
        hv_store ((HV *)SvRV (self), "_var_bind_names", sizeof ("_var_bind_names") - 1, newRV_noinc ((SV *)names), 0);
        hv_store ((HV *)SvRV (self), "_var_bind_types", sizeof ("_var_bind_types") - 1, newRV_noinc ((SV *)types), 0);
        
        while (cur < end && !errflag)
          {
            // SEQUENCE ObjectName ObjectSyntax
            if (get8 () != ASN_SEQUENCE)
              error ("SEQUENCE expected at beginning of VarBind");
            process_length ();

            if (get8 () != ASN_OBJECT_IDENTIFIER)
              error ("OBJECT IDENTIFIER expected at beginning of VarBind");
            int type, oidlen;
            SV *oid = process_object_identifier_sv ();
            SV *val = process_sv (&type);
        
            hv_store_ent (types, oid, newSViv (type), 0);
            hv_store_ent (list , oid, val, 0);
            av_push (names, oid);
          }
        
        //return $this->_report_pdu_error if ($this->{_pdu_type} == REPORT);
        
        RETVAL = newRV_inc ((SV *)list);
}
        OUTPUT:
        RETVAL


Revision:	1.7
Committed:	Thu Apr 9 07:10:23 2009 UTC (15 years, 2 months ago) by root
Branch:	MAIN
Changes since 1.6:	+9 -19 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 BENCHMARK
8
9	#define ASN_BOOLEAN 0x01
10	#define ASN_INTEGER32 0x02
11	#define ASN_OCTET_STRING 0x04
12	#define ASN_NULL 0x05
13	#define ASN_OBJECT_IDENTIFIER 0x06
14	#define ASN_SEQUENCE 0x30
15	#define ASN_IPADDRESS 0x40
16	#define ASN_COUNTER32 0x41
17	#define ASN_UNSIGNED32 0x42
18	#define ASN_TIMETICKS 0x43
19	#define ASN_OPAQUE 0x44
20	#define ASN_COUNTER64 0x46
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
203	static char *
204	write_uv (char *buf, U32 u)
205	{
206	// the one-digit case is absolutely predominant
207	if (u < 10)
208	*buf++ = u + '0';
209	else
210	buf += sprintf (buf, "%u", (unsigned int)u);
211
212	return buf;
213	}
214
215	static SV *
216	process_object_identifier_sv (void)
217	{
218	U32 length = process_length ();
219
220	if (length <= 0)
221	{
222	error ("OBJECT IDENTIFIER length equal to zero");
223	return "";
224	}
225
226	U8 *end = cur + length;
227	U32 w = getb ();
228
229	static char oid[MAX_OID_STRLEN]; // must be static
230	char *app = oid;
231
232	*app = '.'; app += ! ! leading_dot;
233	app = write_uv (app, (U8)w / 40);
234	*app++ = '.';
235	app = write_uv (app, (U8)w % 40);
236
237	// we assume an oid component is never > 64 bytes
238	while (cur < end && oid + sizeof (oid) - app > 64)
239	{
240	w = getb ();
241	*app++ = '.';
242	app = write_uv (app, w);
243	}
244
245	return newSVpvn (oid, app - oid);
246	}
247
248	static AV *av_type;
249
250	static SV *
251	process_sv (int *found)
252	{
253	int type = get8 ();
254
255	*found = type;
256
257	SV *res;
258
259	switch (type)
260	{
261	case ASN_OBJECT_IDENTIFIER:
262	res = process_object_identifier_sv ();
263	break;
264
265	case ASN_INTEGER32:
266	res = process_integer32_sv ();
267	break;
268
269	case ASN_UNSIGNED32:
270	case ASN_COUNTER32:
271	case ASN_TIMETICKS:
272	res = process_unsigned32_sv ();
273	break;
274
275	case ASN_SEQUENCE:
276	res = newSVuv (process_length ());
277	break;
278
279	case ASN_OCTET_STRING:
280	case ASN_OPAQUE:
281	res = process_octet_string_sv ();
282	break;
283
284	default:
285	{
286	if (type > AvFILLp (av_type) \|\| !SvTYPE (AvARRAY (av_type)[type]) == SVt_PVCV)
287	{
288	error ("Unknown ASN.1 type");
289	return &PL_sv_undef;
290	}
291
292	dSP;
293	PUSHMARK (SP);
294	EXTEND (SP, 2);
295	PUSHs (msg);
296	PUSHs (sv_2mortal (newSViv (type)));
297	PUTBACK;
298	int count = call_sv (AvARRAY (av_type)[type], G_SCALAR);
299	SPAGAIN;
300	res = count ? SvREFCNT_inc (TOPs) : &PL_sv_undef;
301	}
302	}
303
304	return errflag ? &PL_sv_undef : res;
305	}
306
307	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::XS
308
309	PROTOTYPES: ENABLE
310
311	BOOT:
312	av_type = newAV ();
313
314	void
315	set_type (int type, SV *cv)
316	CODE:
317	av_store (av_type, type, SvREFCNT_inc (x_get_cv (cv)));
318
319	void
320	set_msg (SV msg_, SV buf_)
321	CODE:
322	errflag = 0;
323	leading_dot = -1;
324	msg = SvREFCNT_inc (msg_);
325	buf = SvPVbyte (buf_, len);
326	cur = buf;
327	rem = len;
328	#ifdef BENCHMARK
329	t1 = tstamp ();
330	#endif
331
332	void
333	clr_msg ()
334	CODE:
335	SvREFCNT_dec (msg);
336	buf = cur = "";
337	len = rem = 0;
338	#ifdef BENCHMARK
339	printf ("%f\n", tstamp () - t1);//D
340	#endif
341
342	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::Message
343
344	void
345	_buffer_get (SV *self, int count = -1)
346	PPCODE:
347	{
348	// grrr.
349	if (count < 0)
350	{
351	hv_delete ((HV *)SvRV (self), "_index" , 6, G_DISCARD);
352	hv_delete ((HV *)SvRV (self), "_length", 7, G_DISCARD);
353	SV *svp = hv_fetch ((HV )SvRV (self), "_buffer", 7, 1);
354	XPUSHs (sv_2mortal (newSVsv (*svp)));
355	sv_setpvn (*svp, "", 0);
356	XSRETURN (1);
357	}
358
359	char *data = getn (count, 0);
360
361	if (data)
362	XPUSHs (sv_2mortal (newSVpvn (data, count)));
363	}
364
365	U32
366	index (SV *self, int ndx = -1)
367	CODE:
368	{
369	if (ndx >= 0 && ndx < len)
370	{
371	cur = buf + ndx;
372	rem = len - ndx;
373	}
374
375	RETVAL = cur - buf;
376	}
377	OUTPUT:
378	RETVAL
379
380	U32
381	_process_length (SV *self, ...)
382	ALIAS:
383	_process_sequence = 0
384	CODE:
385	RETVAL = process_length ();
386	OUTPUT:
387	RETVAL
388
389	SV *
390	_process_integer32 (SV *self, ...)
391	CODE:
392	RETVAL = process_integer32_sv ();
393	OUTPUT:
394	RETVAL
395
396	SV *
397	_process_counter (SV *self, ...)
398	ALIAS:
399	_process_gauge = 0
400	_process_timeticks = 0
401	CODE:
402	RETVAL = process_unsigned32_sv ();
403	OUTPUT:
404	RETVAL
405
406	SV *
407	_process_object_identifier (SV *self, ...)
408	CODE:
409	RETVAL = process_object_identifier_sv ();
410	OUTPUT:
411	RETVAL
412
413	SV *
414	_process_octet_string (SV *self, ...)
415	ALIAS:
416	_process_opaque = 0
417	CODE:
418	RETVAL = process_octet_string_sv ();
419	OUTPUT:
420	RETVAL
421
422	SV *
423	_process_ipaddress (SV *self, ...)
424	CODE:
425	{
426	U32 length = process_length ();
427	if (length != 4)
428	{
429	error ("IP ADDRESS length not four");
430	XSRETURN_UNDEF;
431	}
432
433	U8 *data = getn (4, "\x00\x00\x00\x00");
434	RETVAL = newSVpvf ("%d.%d.%d.%d", data [0], data [1], data [2], data [3]);
435	}
436	OUTPUT:
437	RETVAL
438
439	SV *
440	process (SV self, SV expected = &PL_sv_undef, SV *found = 0)
441	CODE:
442	{
443	int type;
444
445	RETVAL = process_sv (&type);
446
447	if (found)
448	sv_setiv (found, type);
449
450	if (SvOK (expected) && type != SvIV (expected))
451	error ("Expected a different type than found");
452	}
453	OUTPUT:
454	RETVAL
455
456	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::PDU
457
458	SV *
459	_process_var_bind_list (SV *self)
460	CODE:
461	{
462	if (get8 () != ASN_SEQUENCE)
463	error ("SEQUENCE expected at beginning of VarBindList");
464	int seqlen = process_length ();
465	U8 *end = cur + seqlen;
466
467	HV *list = newHV ();
468	AV *names = newAV ();
469	HV *types = newHV ();
470
471	hv_store ((HV )SvRV (self), "_var_bind_list" , sizeof ("_var_bind_list" ) - 1, newRV_noinc ((SV )list ), 0);
472	hv_store ((HV )SvRV (self), "_var_bind_names", sizeof ("_var_bind_names") - 1, newRV_noinc ((SV )names), 0);
473	hv_store ((HV )SvRV (self), "_var_bind_types", sizeof ("_var_bind_types") - 1, newRV_noinc ((SV )types), 0);
474
475	while (cur < end && !errflag)
476	{
477	// SEQUENCE ObjectName ObjectSyntax
478	if (get8 () != ASN_SEQUENCE)
479	error ("SEQUENCE expected at beginning of VarBind");
480	process_length ();
481
482	if (get8 () != ASN_OBJECT_IDENTIFIER)
483	error ("OBJECT IDENTIFIER expected at beginning of VarBind");
484	int type, oidlen;
485	SV *oid = process_object_identifier_sv ();
486	SV *val = process_sv (&type);
487
488	hv_store_ent (types, oid, newSViv (type), 0);
489	hv_store_ent (list , oid, val, 0);
490	av_push (names, oid);
491	}
492
493	//return $this->_report_pdu_error if ($this->{_pdu_type} == REPORT);
494
495	RETVAL = newRV_inc ((SV *)list);
496	}
497	OUTPUT:
498	RETVAL
499
500