cvsroot/Net-SNMP-XS/XS.xs

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

// C99 required

//#define BENCHMARK

enum {
  // ASN_TAG
  ASN_BOOLEAN           = 0x01,
  ASN_INTEGER32         = 0x02,
  ASN_BIT_STRING        = 0x03,
  ASN_OCTET_STRING      = 0x04,
  ASN_NULL              = 0x05,
  ASN_OBJECT_IDENTIFIER = 0x06,
  ASN_SEQUENCE          = 0x10,

  ASN_TAG_BER           = 0x1f,
  ASN_TAG_MASK          = 0x1f,

  // primitive/constructed
  ASN_CONSTRUCTED       = 0x20,

  // ASN_CLASS
  ASN_UNIVERSAL         = 0x00,
  ASN_APPLICATION       = 0x40,
  ASN_CONTEXT           = 0x80,
  ASN_PRIVATE           = 0xc0,

  ASN_CLASS_MASK        = 0xc0,
  ASN_CLASS_SHIFT       = 6,

  // ASN_APPLICATION
  ASN_IPADDRESS         = 0x00,
  ASN_COUNTER32         = 0x01,
  ASN_UNSIGNED32        = 0x02,
  ASN_TIMETICKS         = 0x03,
  ASN_OPAQUE            = 0x04,
  ASN_COUNTER64         = 0x06,
};

enum {
  BER_CLASS       = 0,
  BER_TAG         = 1,
  BER_CONSTRUCTED = 2,
  BER_DATA        = 3,
  BER_ARRAYSIZE
};

#define MAX_OID_STRLEN 4096

#define HAVE_VERSIONSORT defined (_GNU_SOURCE) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1

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

typedef SV *BUFOBJ;

/////////////////////////////////////////////////////////////////////////////

#if 0
        if (msg)
          croak ("recursive invocation of Net::SNMP::XS parser is not supported");


void
clr_msg ()
        CODE:
        SvREFCNT_dec (msg); msg = 0;
        buf = cur = (U8 *)"";
        len = rem = 0;
#endif

static void
clear_bufobj (void)
{
  // serialise our state back
  if (msg && SvROK (msg))
    {
      SV *idx_sv = *hv_fetch ((HV *)cur_bufobj, "_index" , sizeof ("_index" ) - 1, 1);
      sv_setiv (idx_sv, cur - buf);
    }

  SvREFCNT_dec (msg);
  msg        = 0;
  cur_bufobj = 0;
}

static void
switch_bufobj (BUFOBJ neu)
{
  clear_bufobj ();

  msg = newSVsv (neu);
  cur_bufobj = SvRV (msg);
  sv_rvweaken (msg);

  errflag     = 0;
  leading_dot = -1;

  IV index = SvIV (*hv_fetch ((HV *)cur_bufobj, "_index" , sizeof ("_index" ) - 1, 1));
  bufsv    =       *hv_fetch ((HV *)cur_bufobj, "_buffer", sizeof ("_buffer") - 1, 1);

  buf = SvPVbyte (bufsv, len);
  cur = buf + index;
  rem = len - index;
}

/////////////////////////////////////////////////////////////////////////////

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 *errmsg)
{
  errflag = 1;

  if (!msg)
    croak ("Net::SNMP::XS fatal error, parser called without parsing context");

  dSP;
  PUSHMARK (SP);
  EXTEND (SP, 2);
  PUSHs (msg);
  PUSHs (sv_2mortal (newSVpv (errmsg, 0)));
  PUTBACK;
  call_method ("_error", G_VOID | G_DISCARD);
}

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 ());
}

#if IVSIZE >= 8

static U64TYPE
process_integer64 (void)
{
  U32 length = process_length ();

  if (length <= 0)
    {
      error ("INTEGER64 length equal to zero");
      return 0;
    }

  U8 *data = getn (length, 0);

  if (!data)
    return 0;

  if (length > 9 || (length > 8 && data [0]))
    {
      error ("INTEGER64 length too long");
      return 0;
    }

  U64TYPE res = data [0] & 0x80 ? 0xffffffffffffffff : 0;

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

  return res;
}

static SV *
process_integer64_sv (void)
{
  return newSViv ((I64TYPE)process_integer64 ());
}

static SV *
process_unsigned64_sv (void)
{
  return newSVuv ((U64TYPE)process_integer64 ());
}

#endif

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 &PL_sv_undef;
    }

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

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

  if (leading_dot < 0)
    leading_dot = SvTRUE (*hv_fetch ((HV *)SvRV (msg), "_leading_dot", sizeof ("_leading_dot") - 1, 1));

  *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_APPLICATION | ASN_UNSIGNED32:
      case ASN_APPLICATION | ASN_COUNTER32:
      case ASN_APPLICATION | ASN_TIMETICKS:
        res = process_unsigned32_sv ();
        break;

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

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

      default:
        {
          if (type > AvFILLp (av_type)
              || AvARRAY (av_type)[type] == 0
              || AvARRAY (av_type)[type] == &PL_sv_undef)
            {
              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;
}

/////////////////////////////////////////////////////////////////////////////

#if HAVE_VERSIONSORT

static int
oid_lex_cmp (const void *a_, const void *b_)
{
  const char *a = SvPVX (*(SV **)a_);
  const char *b = SvPVX (*(SV **)b_);

  a += *a == '.';
  b += *b == '.';

  return strverscmp (a, b);
}

#endif

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

PROTOTYPES: ENABLE

BOOT:
        av_type = newAV ();

void
set_type (int type, SV *cv)
        CODE:
        cv = x_get_cv (cv);
        assert (SvTYPE (cv) == SVt_PVCV);
        av_store (av_type, type, SvREFCNT_inc_NN (cv));

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

void
_buffer_append (BUFOBJ self, SV *value)
        ALIAS:
        _buffer_put = 1
        PPCODE:
{
        STRLEN vlen;
        const char *vstr = SvPVbyte (value, vlen);

        if (ix)
          sv_insert (bufsv, 0, 0, vstr, vlen);
        else
          sv_catpvn (bufsv, vstr, vlen);

        buf = SvPVbyte (bufsv, len);
        cur = buf;
        rem = len;

        SV *len_sv = *hv_fetch ((HV *)cur_bufobj, "_length", sizeof ("_length") - 1, 1);
        sv_setiv (len_sv, len);

        // some callers test for defined'ness of the returnvalue. *sigh*
        XPUSHs (&PL_sv_yes);
}

void
_buffer_get (BUFOBJ 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);
            XPUSHs (sv_2mortal (newSVsv (bufsv)));
            sv_setpvn (bufsv, "", 0);

            buf = "";
            cur = buf;
            rem = 0;

            XSRETURN (1);
          }

        char *data = getn (count, 0);

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

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

        RETVAL = cur - buf;
}
        OUTPUT: RETVAL

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

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

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

#if IVSIZE >= 8

SV *
_process_counter64 (BUFOBJ self, ...)
        CODE:
        RETVAL = process_unsigned64_sv ();
        OUTPUT: RETVAL

#endif

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

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

SV *
_process_ipaddress (BUFOBJ 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 (BUFOBJ 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 (BUFOBJ self)
        CODE:
{
        if (get8 () != ASN_SEQUENCE | ASN_CONSTRUCTED)
          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 *)cur_bufobj, "_var_bind_list" , sizeof ("_var_bind_list" ) - 1, newRV_noinc ((SV *)list ), 0);
        hv_store ((HV *)cur_bufobj, "_var_bind_names", sizeof ("_var_bind_names") - 1, newRV_noinc ((SV *)names), 0);
        hv_store ((HV *)cur_bufobj, "_var_bind_types", sizeof ("_var_bind_types") - 1, newRV_noinc ((SV *)types), 0);
        
        while (cur < end && !errflag)
          {
            // SEQUENCE ObjectName ObjectSyntax
            if (get8 () != ASN_SEQUENCE | ASN_CONSTRUCTED)
              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);
          }
        
        // sigh - great design to do it here
        SV *pdu_type = *hv_fetch ((HV *)cur_bufobj, "_pdu_type" , sizeof ("_pdu_type" ) - 1, 1);

        if (SvIV (pdu_type) == 0xa8) // REPORT
          {
            PUSHMARK (SP);
            XPUSHs (msg);
            PUTBACK;
            call_method ("_report_pdu_error", G_VOID | G_DISCARD);
            SPAGAIN;
            XSRETURN_EMPTY;
          }
        
        RETVAL = newRV_inc ((SV *)list);
}
        OUTPUT: RETVAL

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

void
oid_base_match (SV *base_, SV *oid_)
        PROTOTYPE: $$
        ALIAS:
        oid_context_match = 0
        PPCODE:
{
        if (!SvOK (base_) || !SvOK (oid_))
          XSRETURN_NO;

        STRLEN blen, olen;
        char *base = SvPVbyte (base_, blen);
        char *oid  = SvPVbyte (oid_ , olen);

        blen -= *base == '.'; base += *base == '.';
        olen -= *base == '.'; oid  += *oid  == '.';

        if (olen < blen)
          XSRETURN_NO;

        if (memcmp (base, oid, blen))
          XSRETURN_NO;

        if (oid [blen] && oid [blen] != '.')
          XSRETURN_NO;

        XSRETURN_YES;
}

#if HAVE_VERSIONSORT

void
oid_lex_sort (...)
        PROTOTYPE: @
        PPCODE:
{
        // make sure SvPVX is valid
        int i;
        for (i = items; i--; )
          {
            SV *sv = ST (i);

            if (SvTYPE (sv) < SVt_PV || SvTYPE (sv) == SVt_PVAV && SvTYPE (sv) == SVt_PVHV)
              SvPV_force_nolen (sv);
          }

        qsort (&ST (0), items, sizeof (SV *), oid_lex_cmp);

        EXTEND (SP, items);
        // we cheat somewhat by not returning copies here
        for (i = 0; i < items; ++i)
          PUSHs (sv_2mortal (SvREFCNT_inc (ST (i))));
}

int
_index_cmp (const char *a, const char *b)
        PROTOTYPE: $$
        CODE:
        RETVAL = strverscmp (a, b);
        OUTPUT: RETVAL

#endif

Revision:	1.21
Committed:	Fri Apr 19 15:54:22 2019 UTC (7 years, 6 months ago) by root
Branch:	MAIN
Changes since 1.20:	+1 -245 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include "EXTERN.h"
2			#include "perl.h"
3			#include "XSUB.h"
4
5			// C99 required
6
7	root	1.8	//#define BENCHMARK
8	root	1.7
9	root	1.18	enum {
10	root	1.20	// ASN_TAG
11	root	1.18	ASN_BOOLEAN = 0x01,
12			ASN_INTEGER32 = 0x02,
13	root	1.19	ASN_BIT_STRING = 0x03,
14	root	1.18	ASN_OCTET_STRING = 0x04,
15			ASN_NULL = 0x05,
16			ASN_OBJECT_IDENTIFIER = 0x06,
17	root	1.20	ASN_SEQUENCE = 0x10,
18	root	1.19
19			ASN_TAG_BER = 0x1f,
20			ASN_TAG_MASK = 0x1f,
21
22	root	1.20	// primitive/constructed
23	root	1.19	ASN_CONSTRUCTED = 0x20,
24
25	root	1.20	// ASN_CLASS
26	root	1.19	ASN_UNIVERSAL = 0x00,
27			ASN_APPLICATION = 0x40,
28			ASN_CONTEXT = 0x80,
29			ASN_PRIVATE = 0xc0,
30
31			ASN_CLASS_MASK = 0xc0,
32			ASN_CLASS_SHIFT = 6,
33
34	root	1.20	// ASN_APPLICATION
35			ASN_IPADDRESS = 0x00,
36			ASN_COUNTER32 = 0x01,
37			ASN_UNSIGNED32 = 0x02,
38			ASN_TIMETICKS = 0x03,
39			ASN_OPAQUE = 0x04,
40			ASN_COUNTER64 = 0x06,
41			};
42
43			enum {
44			BER_CLASS = 0,
45			BER_TAG = 1,
46			BER_CONSTRUCTED = 2,
47			BER_DATA = 3,
48			BER_ARRAYSIZE
49	root	1.18	};
50	root	1.1
51	root	1.4	#define MAX_OID_STRLEN 4096
52
53	root	1.10	#define HAVE_VERSIONSORT defined (_GNU_SOURCE) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1
54
55	root	1.12	static SV *cur_bufobj;
56	root	1.13	static SV msg, bufsv;
57	root	1.4	static int errflag, leading_dot;
58	root	1.1	static U8 buf, cur;
59			static STRLEN len, rem;
60
61	root	1.12	typedef SV *BUFOBJ;
62
63			/////////////////////////////////////////////////////////////////////////////
64
65			#if 0
66			if (msg)
67			croak ("recursive invocation of Net::SNMP::XS parser is not supported");
68
69
70			void
71			clr_msg ()
72			CODE:
73			SvREFCNT_dec (msg); msg = 0;
74			buf = cur = (U8 *)"";
75			len = rem = 0;
76			#endif
77
78			static void
79	root	1.13	clear_bufobj (void)
80	root	1.12	{
81			// serialise our state back
82			if (msg && SvROK (msg))
83			{
84			SV idx_sv = hv_fetch ((HV *)cur_bufobj, "_index" , sizeof ("_index" ) - 1, 1);
85			sv_setiv (idx_sv, cur - buf);
86	root	1.15	}
87	root	1.13
88	root	1.15	SvREFCNT_dec (msg);
89			msg = 0;
90			cur_bufobj = 0;
91	root	1.13	}
92
93			static void
94			switch_bufobj (BUFOBJ neu)
95			{
96			clear_bufobj ();
97	root	1.12
98			msg = newSVsv (neu);
99			cur_bufobj = SvRV (msg);
100			sv_rvweaken (msg);
101
102			errflag = 0;
103			leading_dot = -1;
104	root	1.13
105			IV index = SvIV (hv_fetch ((HV )cur_bufobj, "_index" , sizeof ("_index" ) - 1, 1));
106			bufsv = hv_fetch ((HV )cur_bufobj, "_buffer", sizeof ("_buffer") - 1, 1);
107
108			buf = SvPVbyte (bufsv, len);
109			cur = buf + index;
110			rem = len - index;
111	root	1.12	}
112
113			/////////////////////////////////////////////////////////////////////////////
114
115	root	1.3	static SV *
116			x_get_cv (SV *cb_sv)
117			{
118			HV *st;
119			GV *gvp;
120			CV *cv = sv_2cv (cb_sv, &st, &gvp, 0);
121
122			if (!cv)
123			croak ("CODE reference expected");
124
125			return (SV *)cv;
126			}
127
128	root	1.1	static void
129	root	1.8	error (const char *errmsg)
130	root	1.1	{
131			errflag = 1;
132
133	root	1.9	if (!msg)
134			croak ("Net::SNMP::XS fatal error, parser called without parsing context");
135
136	root	1.8	dSP;
137			PUSHMARK (SP);
138			EXTEND (SP, 2);
139			PUSHs (msg);
140			PUSHs (sv_2mortal (newSVpv (errmsg, 0)));
141			PUTBACK;
142			call_method ("_error", G_VOID \| G_DISCARD);
143	root	1.1	}
144
145			static int
146			need (int count)
147			{
148			if (count < 0 \|\| (int)rem < count)
149			{
150			error ("Unexpected end of message buffer");
151			return 0;
152			}
153
154			return 1;
155			}
156
157			static U8 *
158			getn (int count, const U8 *errres)
159			{
160			if (!need (count))
161			return (U8 *)errres;
162
163			U8 *res = cur;
164
165			cur += count;
166			rem -= count;
167
168			return res;
169			}
170
171			static U8
172			get8 (void)
173			{
174			if (rem <= 0)
175			{
176			error ("Unexpected end of message buffer");
177			return 0;
178			}
179
180			rem--;
181			return *cur++;
182			}
183
184			static U32
185			getb (void)
186			{
187			U32 res = 0;
188
189			for (;;)
190			{
191			U8 c = get8 ();
192			res = (res << 7) \| (c & 0x7f);
193
194			if (!(c & 0x80))
195			return res;
196			}
197			}
198
199			#ifdef BENCHMARK
200			static double t1;
201
202			static double
203			tstamp (void)
204			{
205			struct timeval tv;
206			gettimeofday (&tv, 0);
207			return tv.tv_sec + tv.tv_usec * 0.000001;
208			}
209			#endif
210
211			static U32
212			process_length (void)
213			{
214			U32 res = get8 ();
215
216			if (res & 0x80)
217			{
218			int cnt = res & 0x7f;
219			res = 0;
220
221			switch (cnt)
222			{
223			case 0:
224			error ("Indefinite ASN.1 lengths not supported");
225			return 0;
226
227			default:
228			error ("ASN.1 length too long");
229			return 0;
230
231			case 4: res = (res << 8) \| get8 ();
232			case 3: res = (res << 8) \| get8 ();
233			case 2: res = (res << 8) \| get8 ();
234			case 1: res = (res << 8) \| get8 ();
235			}
236			}
237
238			return res;
239			}
240
241	root	1.4	static U32
242			process_integer32 (void)
243			{
244			U32 length = process_length ();
245
246			if (length <= 0)
247			{
248			error ("INTEGER32 length equal to zero");
249			return 0;
250			}
251
252			U8 *data = getn (length, 0);
253
254			if (!data)
255			return 0;
256
257			if (length > 5 \|\| (length > 4 && data [0]))
258			{
259			error ("INTEGER32 length too long");
260			return 0;
261			}
262
263			U32 res = data [0] & 0x80 ? 0xffffffff : 0;
264
265			while (length--)
266			res = (res << 8) \| *data++;
267
268			return res;
269			}
270
271			static SV *
272			process_integer32_sv (void)
273			{
274			return newSViv ((I32)process_integer32 ());
275			}
276
277			static SV *
278			process_unsigned32_sv (void)
279			{
280			return newSVuv ((U32)process_integer32 ());
281			}
282
283	root	1.8	#if IVSIZE >= 8
284
285			static U64TYPE
286			process_integer64 (void)
287			{
288			U32 length = process_length ();
289
290			if (length <= 0)
291			{
292			error ("INTEGER64 length equal to zero");
293			return 0;
294			}
295
296			U8 *data = getn (length, 0);
297
298			if (!data)
299			return 0;
300
301			if (length > 9 \|\| (length > 8 && data [0]))
302			{
303			error ("INTEGER64 length too long");
304			return 0;
305			}
306
307			U64TYPE res = data [0] & 0x80 ? 0xffffffffffffffff : 0;
308
309			while (length--)
310			res = (res << 8) \| *data++;
311
312			return res;
313			}
314
315			static SV *
316			process_integer64_sv (void)
317			{
318			return newSViv ((I64TYPE)process_integer64 ());
319			}
320
321			static SV *
322			process_unsigned64_sv (void)
323			{
324			return newSVuv ((U64TYPE)process_integer64 ());
325			}
326
327			#endif
328
329	root	1.4	static SV *
330			process_octet_string_sv (void)
331			{
332			U32 length = process_length ();
333
334			U8 *data = getn (length, 0);
335			if (!data)
336			{
337			error ("OCTET STRING too long");
338			return &PL_sv_undef;
339			}
340
341			return newSVpvn (data, length);
342			}
343	root	1.5
344			static char *
345			write_uv (char *buf, U32 u)
346			{
347			// the one-digit case is absolutely predominant
348			if (u < 10)
349			*buf++ = u + '0';
350			else
351			buf += sprintf (buf, "%u", (unsigned int)u);
352
353			return buf;
354			}
355
356	root	1.7	static SV *
357			process_object_identifier_sv (void)
358	root	1.4	{
359			U32 length = process_length ();
360
361			if (length <= 0)
362			{
363			error ("OBJECT IDENTIFIER length equal to zero");
364	root	1.8	return &PL_sv_undef;
365	root	1.4	}
366
367			U8 *end = cur + length;
368			U32 w = getb ();
369
370	root	1.6	static char oid[MAX_OID_STRLEN]; // must be static
371	root	1.5	char *app = oid;
372	root	1.4
373	root	1.11	if (leading_dot < 0)
374			leading_dot = SvTRUE (hv_fetch ((HV )SvRV (msg), "_leading_dot", sizeof ("_leading_dot") - 1, 1));
375
376	root	1.5	*app = '.'; app += ! ! leading_dot;
377	root	1.6	app = write_uv (app, (U8)w / 40);
378	root	1.5	*app++ = '.';
379	root	1.6	app = write_uv (app, (U8)w % 40);
380	root	1.4
381	root	1.5	// we assume an oid component is never > 64 bytes
382			while (cur < end && oid + sizeof (oid) - app > 64)
383			{
384			w = getb ();
385			*app++ = '.';
386			app = write_uv (app, w);
387			}
388	root	1.4
389	root	1.7	return newSVpvn (oid, app - oid);
390	root	1.6	}
391
392			static AV *av_type;
393
394			static SV *
395			process_sv (int *found)
396			{
397			int type = get8 ();
398
399			*found = type;
400
401			SV *res;
402
403			switch (type)
404	root	1.4	{
405	root	1.6	case ASN_OBJECT_IDENTIFIER:
406			res = process_object_identifier_sv ();
407			break;
408
409			case ASN_INTEGER32:
410			res = process_integer32_sv ();
411			break;
412
413	root	1.20	case ASN_APPLICATION \| ASN_UNSIGNED32:
414			case ASN_APPLICATION \| ASN_COUNTER32:
415			case ASN_APPLICATION \| ASN_TIMETICKS:
416	root	1.6	res = process_unsigned32_sv ();
417			break;
418
419	root	1.20	case ASN_SEQUENCE \| ASN_CONSTRUCTED:
420	root	1.6	res = newSVuv (process_length ());
421			break;
422
423			case ASN_OCTET_STRING:
424	root	1.20	case ASN_APPLICATION \| ASN_OPAQUE:
425	root	1.6	res = process_octet_string_sv ();
426			break;
427
428			default:
429			{
430	root	1.16	if (type > AvFILLp (av_type)
431			\|\| AvARRAY (av_type)[type] == 0
432			\|\| AvARRAY (av_type)[type] == &PL_sv_undef)
433	root	1.6	{
434			error ("Unknown ASN.1 type");
435			return &PL_sv_undef;
436			}
437
438			dSP;
439			PUSHMARK (SP);
440			EXTEND (SP, 2);
441			PUSHs (msg);
442			PUSHs (sv_2mortal (newSViv (type)));
443			PUTBACK;
444			int count = call_sv (AvARRAY (av_type)[type], G_SCALAR);
445			SPAGAIN;
446			res = count ? SvREFCNT_inc (TOPs) : &PL_sv_undef;
447			}
448	root	1.4	}
449
450	root	1.6	return errflag ? &PL_sv_undef : res;
451	root	1.4	}
452
453	root	1.10	/////////////////////////////////////////////////////////////////////////////
454
455			#if HAVE_VERSIONSORT
456
457			static int
458			oid_lex_cmp (const void a_, const void b_)
459			{
460			const char a = SvPVX ((SV **)a_);
461			const char b = SvPVX ((SV **)b_);
462
463			a += *a == '.';
464			b += *b == '.';
465
466			return strverscmp (a, b);
467			}
468
469			#endif
470
471	root	1.1	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::XS
472
473	root	1.3	PROTOTYPES: ENABLE
474
475			BOOT:
476	root	1.21	av_type = newAV ();
477	root	1.3
478			void
479			set_type (int type, SV *cv)
480			CODE:
481	root	1.16	cv = x_get_cv (cv);
482			assert (SvTYPE (cv) == SVt_PVCV);
483			av_store (av_type, type, SvREFCNT_inc_NN (cv));
484	root	1.3
485	root	1.13	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::Message
486
487	root	1.1	void
488	root	1.13	_buffer_append (BUFOBJ self, SV *value)
489			ALIAS:
490			_buffer_put = 1
491			PPCODE:
492			{
493			STRLEN vlen;
494			const char *vstr = SvPVbyte (value, vlen);
495
496			if (ix)
497			sv_insert (bufsv, 0, 0, vstr, vlen);
498			else
499			sv_catpvn (bufsv, vstr, vlen);
500
501			buf = SvPVbyte (bufsv, len);
502			cur = buf;
503			rem = len;
504	root	1.1
505	root	1.13	SV len_sv = hv_fetch ((HV *)cur_bufobj, "_length", sizeof ("_length") - 1, 1);
506			sv_setiv (len_sv, len);
507	root	1.1
508	root	1.13	// some callers test for defined'ness of the returnvalue. sigh
509			XPUSHs (&PL_sv_yes);
510			}
511	root	1.1
512			void
513	root	1.12	_buffer_get (BUFOBJ self, int count = -1)
514	root	1.1	PPCODE:
515			{
516			// grrr.
517			if (count < 0)
518			{
519			hv_delete ((HV *)SvRV (self), "_index" , 6, G_DISCARD);
520			hv_delete ((HV *)SvRV (self), "_length", 7, G_DISCARD);
521	root	1.13	XPUSHs (sv_2mortal (newSVsv (bufsv)));
522			sv_setpvn (bufsv, "", 0);
523
524			buf = "";
525			cur = buf;
526			rem = 0;
527
528	root	1.1	XSRETURN (1);
529			}
530
531			char *data = getn (count, 0);
532
533			if (data)
534			XPUSHs (sv_2mortal (newSVpvn (data, count)));
535			}
536
537			U32
538	root	1.12	index (BUFOBJ self, int ndx = -1)
539	root	1.1	CODE:
540			{
541			if (ndx >= 0 && ndx < len)
542			{
543			cur = buf + ndx;
544			rem = len - ndx;
545			}
546
547			RETVAL = cur - buf;
548			}
549	root	1.18	OUTPUT: RETVAL
550	root	1.1
551			U32
552	root	1.12	_process_length (BUFOBJ self, ...)
553	root	1.1	ALIAS:
554	root	1.3	_process_sequence = 0
555	root	1.1	CODE:
556			RETVAL = process_length ();
557	root	1.18	OUTPUT: RETVAL
558	root	1.1
559	root	1.4	SV *
560	root	1.12	_process_integer32 (BUFOBJ self, ...)
561	root	1.4	CODE:
562			RETVAL = process_integer32_sv ();
563	root	1.18	OUTPUT: RETVAL
564	root	1.4
565			SV *
566	root	1.12	_process_counter (BUFOBJ self, ...)
567	root	1.1	ALIAS:
568	root	1.4	_process_gauge = 0
569			_process_timeticks = 0
570	root	1.1	CODE:
571	root	1.4	RETVAL = process_unsigned32_sv ();
572	root	1.18	OUTPUT: RETVAL
573	root	1.1
574	root	1.8	#if IVSIZE >= 8
575
576			SV *
577	root	1.12	_process_counter64 (BUFOBJ self, ...)
578	root	1.8	CODE:
579			RETVAL = process_unsigned64_sv ();
580	root	1.18	OUTPUT: RETVAL
581	root	1.8
582			#endif
583
584	root	1.1	SV *
585	root	1.12	_process_object_identifier (BUFOBJ self, ...)
586	root	1.1	CODE:
587	root	1.4	RETVAL = process_object_identifier_sv ();
588	root	1.18	OUTPUT: RETVAL
589	root	1.1
590			SV *
591	root	1.12	_process_octet_string (BUFOBJ self, ...)
592	root	1.1	ALIAS:
593			_process_opaque = 0
594			CODE:
595	root	1.4	RETVAL = process_octet_string_sv ();
596	root	1.18	OUTPUT: RETVAL
597	root	1.1
598			SV *
599	root	1.12	_process_ipaddress (BUFOBJ self, ...)
600	root	1.1	CODE:
601			{
602	root	1.17	U32 length = process_length ();
603	root	1.1	if (length != 4)
604			{
605			error ("IP ADDRESS length not four");
606			XSRETURN_UNDEF;
607			}
608
609			U8 *data = getn (4, "\x00\x00\x00\x00");
610			RETVAL = newSVpvf ("%d.%d.%d.%d", data [0], data [1], data [2], data [3]);
611			}
612	root	1.18	OUTPUT: RETVAL
613	root	1.1
614	root	1.3	SV *
615	root	1.12	process (BUFOBJ self, SV expected = &PL_sv_undef, SV found = 0)
616	root	1.6	CODE:
617	root	1.3	{
618	root	1.17	int type;
619	root	1.3
620	root	1.6	RETVAL = process_sv (&type);
621	root	1.3
622			if (found)
623			sv_setiv (found, type);
624
625	root	1.6	if (SvOK (expected) && type != SvIV (expected))
626			error ("Expected a different type than found");
627	root	1.4	}
628	root	1.18	OUTPUT: RETVAL
629	root	1.4
630			MODULE = Net::SNMP::XS PACKAGE = Net::SNMP::PDU
631
632			SV *
633	root	1.12	_process_var_bind_list (BUFOBJ self)
634	root	1.4	CODE:
635			{
636	root	1.20	if (get8 () != ASN_SEQUENCE \| ASN_CONSTRUCTED)
637	root	1.6	error ("SEQUENCE expected at beginning of VarBindList");
638	root	1.20
639	root	1.6	int seqlen = process_length ();
640			U8 *end = cur + seqlen;
641
642			HV *list = newHV ();
643			AV *names = newAV ();
644			HV *types = newHV ();
645
646	root	1.12	hv_store ((HV )cur_bufobj, "_var_bind_list" , sizeof ("_var_bind_list" ) - 1, newRV_noinc ((SV )list ), 0);
647			hv_store ((HV )cur_bufobj, "_var_bind_names", sizeof ("_var_bind_names") - 1, newRV_noinc ((SV )names), 0);
648			hv_store ((HV )cur_bufobj, "_var_bind_types", sizeof ("_var_bind_types") - 1, newRV_noinc ((SV )types), 0);
649	root	1.4
650	root	1.6	while (cur < end && !errflag)
651			{
652			// SEQUENCE ObjectName ObjectSyntax
653	root	1.20	if (get8 () != ASN_SEQUENCE \| ASN_CONSTRUCTED)
654	root	1.6	error ("SEQUENCE expected at beginning of VarBind");
655			process_length ();
656
657			if (get8 () != ASN_OBJECT_IDENTIFIER)
658			error ("OBJECT IDENTIFIER expected at beginning of VarBind");
659			int type, oidlen;
660	root	1.7	SV *oid = process_object_identifier_sv ();
661	root	1.6	SV *val = process_sv (&type);
662
663	root	1.7	hv_store_ent (types, oid, newSViv (type), 0);
664			hv_store_ent (list , oid, val, 0);
665			av_push (names, oid);
666	root	1.6	}
667	root	1.4
668	root	1.12	// sigh - great design to do it here
669			SV pdu_type = hv_fetch ((HV *)cur_bufobj, "_pdu_type" , sizeof ("_pdu_type" ) - 1, 1);
670
671			if (SvIV (pdu_type) == 0xa8) // REPORT
672			{
673			PUSHMARK (SP);
674			XPUSHs (msg);
675			PUTBACK;
676			call_method ("_report_pdu_error", G_VOID \| G_DISCARD);
677			SPAGAIN;
678			XSRETURN_EMPTY;
679			}
680	root	1.4
681	root	1.6	RETVAL = newRV_inc ((SV *)list);
682	root	1.4	}
683	root	1.18	OUTPUT: RETVAL
684	root	1.3
685	root	1.10	MODULE = Net::SNMP::XS PACKAGE = Net::SNMP
686
687			void
688			oid_base_match (SV base_, SV oid_)
689			PROTOTYPE: $$
690			ALIAS:
691			oid_context_match = 0
692			PPCODE:
693			{
694			if (!SvOK (base_) \|\| !SvOK (oid_))
695			XSRETURN_NO;
696
697			STRLEN blen, olen;
698	root	1.13	char *base = SvPVbyte (base_, blen);
699			char *oid = SvPVbyte (oid_ , olen);
700	root	1.10
701			blen -= base == '.'; base += base == '.';
702			olen -= base == '.'; oid += oid == '.';
703
704			if (olen < blen)
705			XSRETURN_NO;
706
707			if (memcmp (base, oid, blen))
708			XSRETURN_NO;
709
710			if (oid [blen] && oid [blen] != '.')
711			XSRETURN_NO;
712
713			XSRETURN_YES;
714			}
715
716			#if HAVE_VERSIONSORT
717
718			void
719			oid_lex_sort (...)
720			PROTOTYPE: @
721			PPCODE:
722			{
723			// make sure SvPVX is valid
724			int i;
725			for (i = items; i--; )
726			{
727			SV *sv = ST (i);
728
729			if (SvTYPE (sv) < SVt_PV \|\| SvTYPE (sv) == SVt_PVAV && SvTYPE (sv) == SVt_PVHV)
730			SvPV_force_nolen (sv);
731			}
732
733			qsort (&ST (0), items, sizeof (SV *), oid_lex_cmp);
734
735			EXTEND (SP, items);
736			// we cheat somewhat by not returning copies here
737			for (i = 0; i < items; ++i)
738			PUSHs (sv_2mortal (SvREFCNT_inc (ST (i))));
739			}
740
741			int
742			_index_cmp (const char a, const char b)
743			PROTOTYPE: $$
744			CODE:
745			RETVAL = strverscmp (a, b);
746	root	1.18	OUTPUT: RETVAL
747	root	1.10
748			#endif
749	root	1.3