2 * netsniff-ng - the packet sniffing beast
3 * By Daniel Borkmann <daniel@netsniff-ng.org>
4 * Copyright 2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
5 * Swiss federal institute of technology (ETH Zurich)
6 * Subject to the GPL, version 2.
9 /* yaac-func-prefix: yy */
22 #include "trafgen_parser.tab.h"
23 #include "trafgen_conf.h"
30 #define YYERROR_VERBOSE 0
32 #define YYENABLE_NLS 1
33 #define YYLTYPE_IS_TRIVIAL 1
37 extern
int yylex(void);
38 extern
void yyerror(const char *);
42 extern
struct packet
*packets
;
45 #define packet_last (plen - 1)
47 #define payload_last (packets[packet_last].len - 1)
49 extern
struct packet_dyn
*packet_dyn
;
52 #define packetd_last (dlen - 1)
54 #define packetdc_last (packet_dyn[packetd_last].clen - 1)
55 #define packetdr_last (packet_dyn[packetd_last].rlen - 1)
56 #define packetds_last (packet_dyn[packetd_last].slen - 1)
58 static int our_cpu
, min_cpu
= -1, max_cpu
= -1;
60 static inline
int test_ignore
(void)
62 if
(min_cpu
< 0 && max_cpu
< 0)
64 else if
(max_cpu
>= our_cpu
&& min_cpu
<= our_cpu
)
70 static inline
int has_dynamic_elems
(struct packet_dyn
*p
)
72 return
(p
->rlen
+ p
->slen
+ p
->clen
);
75 static inline
void __init_new_packet_slot
(struct packet
*slot
)
81 static inline
void __init_new_counter_slot
(struct packet_dyn
*slot
)
87 static inline
void __init_new_randomizer_slot
(struct packet_dyn
*slot
)
93 static inline
void __init_new_csum_slot
(struct packet_dyn
*slot
)
99 static inline
void __setup_new_counter
(struct counter
*c
, uint8_t start
,
100 uint8_t stop
, uint8_t stepping
,
106 c
->val
= (type
== TYPE_INC
) ? start
: stop
;
107 c
->off
= payload_last
;
111 static inline
void __setup_new_randomizer
(struct randomizer
*r
)
113 r
->off
= payload_last
;
116 static inline
void __setup_new_csum16
(struct csum16
*s
, off_t from
, off_t to
,
119 s
->off
= payload_last
- 1;
125 static void realloc_packet
(void)
131 packets
= xrealloc
(packets
, 1, plen
* sizeof
(*packets
));
133 __init_new_packet_slot
(&packets
[packet_last
]);
136 packet_dyn
= xrealloc
(packet_dyn
, 1, dlen
* sizeof
(*packet_dyn
));
138 __init_new_counter_slot
(&packet_dyn
[packetd_last
]);
139 __init_new_randomizer_slot
(&packet_dyn
[packetd_last
]);
140 __init_new_csum_slot
(&packet_dyn
[packetd_last
]);
143 static void set_byte
(uint8_t val
)
145 struct packet
*pkt
= &packets
[packet_last
];
151 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
152 pkt
->payload
[payload_last
] = val
;
155 static void set_multi_byte
(uint8_t *s
, size_t len
)
159 for
(i
= 0; i
< len
; ++i
)
163 static void set_fill
(uint8_t val
, size_t len
)
166 struct packet
*pkt
= &packets
[packet_last
];
172 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
173 for
(i
= 0; i
< len
; ++i
)
174 pkt
->payload
[payload_last
- i
] = val
;
177 static void __set_csum16_dynamic
(size_t from
, size_t to
, enum csum which
)
179 struct packet
*pkt
= &packets
[packet_last
];
180 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
183 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
186 pktd
->csum
= xrealloc
(pktd
->csum
, 1, pktd
->slen
* sizeof
(struct csum16
));
188 __setup_new_csum16
(&pktd
->csum
[packetds_last
], from
, to
, which
);
191 static void __set_csum16_static
(size_t from
, size_t to
, enum csum which __maybe_unused
)
193 struct packet
*pkt
= &packets
[packet_last
];
197 sum
= htons
(calc_csum
(pkt
->payload
+ from
, to
- from
, 0));
198 psum
= (uint8_t *) &sum
;
204 static void set_csum16
(size_t from
, size_t to
, enum csum which
)
206 int make_it_dynamic
= 0;
207 struct packet
*pkt
= &packets
[packet_last
];
208 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
220 bug_on
(!(from
< to
));
222 if
(to
>= pkt
->len || which
== CSUM_TCP || which
== CSUM_UDP
)
225 if
(has_dynamic_elems
(pktd
) || make_it_dynamic
)
226 __set_csum16_dynamic
(from
, to
, which
);
228 __set_csum16_static
(from
, to
, which
);
231 static void set_rnd
(size_t len
)
234 struct packet
*pkt
= &packets
[packet_last
];
240 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
241 for
(i
= 0; i
< len
; ++i
)
242 pkt
->payload
[payload_last
- i
] = (uint8_t) rand
();
245 static void set_sequential_inc
(uint8_t start
, size_t len
, uint8_t stepping
)
248 struct packet
*pkt
= &packets
[packet_last
];
254 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
255 for
(i
= 0; i
< len
; ++i
) {
256 off_t off
= len
- 1 - i
;
258 pkt
->payload
[payload_last
- off
] = start
;
263 static void set_sequential_dec
(uint8_t start
, size_t len
, uint8_t stepping
)
266 struct packet
*pkt
= &packets
[packet_last
];
272 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
273 for
(i
= 0; i
< len
; ++i
) {
274 int off
= len
- 1 - i
;
276 pkt
->payload
[payload_last
- off
] = start
;
281 static void set_dynamic_rnd
(void)
283 struct packet
*pkt
= &packets
[packet_last
];
284 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
290 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
293 pktd
->rnd
= xrealloc
(pktd
->rnd
, 1, pktd
->rlen
* sizeof
(struct randomizer
));
295 __setup_new_randomizer
(&pktd
->rnd
[packetdr_last
]);
298 static void set_dynamic_incdec
(uint8_t start
, uint8_t stop
, uint8_t stepping
,
301 struct packet
*pkt
= &packets
[packet_last
];
302 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
308 pkt
->payload
= xrealloc
(pkt
->payload
, 1, pkt
->len
);
311 pktd
->cnt
=xrealloc
(pktd
->cnt
, 1, pktd
->clen
* sizeof
(struct counter
));
313 __setup_new_counter
(&pktd
->cnt
[packetdc_last
], start
, stop
, stepping
, type
);
319 long long int number
;
323 %token K_COMMENT K_FILL K_RND K_SEQINC K_SEQDEC K_DRND K_DINC K_DDEC K_WHITE
324 %token K_CPU K_CSUMIP K_CSUMUDP K_CSUMTCP K_CONST8 K_CONST16 K_CONST32 K_CONST64
326 %token
',' '{' '}' '(' ')' '[' ']' ':' '-' '+' '*' '/' '%' '&' '|' '<' '>' '^'
330 %type
<number
> number expression
333 %left
'-' '+' '*' '/' '%' '&' '|' '<' '>' '^'
340 | packets inline_comment
{ }
341 | packets K_WHITE
{ }
361 | delimiter_nowhite
{ }
365 : '{' noenforce_white payload noenforce_white
'}' {
366 min_cpu
= max_cpu
= -1;
369 | K_CPU
'(' number cpu_delim number
')' ':' noenforce_white
'{' noenforce_white payload noenforce_white
'}' {
373 if
(min_cpu
> max_cpu
) {
382 | K_CPU
'(' number
')' ':' noenforce_white
'{' noenforce_white payload noenforce_white
'}' {
383 min_cpu
= max_cpu
= $3;
390 | payload elem_delimiter
{ }
394 : delimiter_nowhite
{ }
403 : number
{ set_byte
((uint8_t) $1); }
404 |
string { set_multi_byte
((uint8_t *) $1 + 1, strlen
($1) - 2); }
420 | expression
'+' expression
422 | expression
'-' expression
424 | expression
'*' expression
426 | expression
'/' expression
428 | expression
'%' expression
430 | expression
'&' expression
432 | expression
'|' expression
434 | expression
'^' expression
436 | expression
'<' '<' expression
438 | expression
'>' '>' expression
447 : K_FILL
'(' number delimiter number
')'
448 { set_fill
($3, $5); }
452 : K_CONST8
'(' expression
')'
453 { set_byte
((uint8_t) $3); }
454 | K_CONST16
'(' expression
')' {
455 uint16_t __c
= cpu_to_be16
((uint16_t) $3);
457 set_multi_byte
((uint8_t *) &__c
, sizeof
(__c
));
459 | K_CONST32
'(' expression
')' {
460 uint32_t __c
= cpu_to_be32
((uint32_t) $3);
462 set_multi_byte
((uint8_t *) &__c
, sizeof
(__c
));
464 | K_CONST64
'(' expression
')' {
465 uint64_t __c
= cpu_to_be64
((uint64_t) $3);
467 set_multi_byte
((uint8_t *) &__c
, sizeof
(__c
));
472 : K_RND
'(' number
')'
477 : K_CSUMIP
'(' number delimiter number
')'
478 { set_csum16
($3, $5, CSUM_IP
); }
479 | K_CSUMTCP
'(' number delimiter number
')'
480 { set_csum16
($3, $5, CSUM_TCP
); }
481 | K_CSUMUDP
'(' number delimiter number
')'
482 { set_csum16
($3, $5, CSUM_UDP
); }
486 : K_SEQINC
'(' number delimiter number
')'
487 { set_sequential_inc
($3, $5, 1); }
488 | K_SEQINC
'(' number delimiter number delimiter number
')'
489 { set_sequential_inc
($3, $5, $7); }
493 : K_SEQDEC
'(' number delimiter number
')'
494 { set_sequential_dec
($3, $5, 1); }
495 | K_SEQDEC
'(' number delimiter number delimiter number
')'
496 { set_sequential_dec
($3, $5, $7); }
501 { set_dynamic_rnd
(); }
502 | K_DRND
'(' number
')'
505 for
(i
= 0; i
< max
; ++i
)
511 : K_DINC
'(' number delimiter number
')'
512 { set_dynamic_incdec
($3, $5, 1, TYPE_INC
); }
513 | K_DINC
'(' number delimiter number delimiter number
')'
514 { set_dynamic_incdec
($3, $5, $7, TYPE_INC
); }
518 : K_DDEC
'(' number delimiter number
')'
519 { set_dynamic_incdec
($3, $5, 1, TYPE_DEC
); }
520 | K_DDEC
'(' number delimiter number delimiter number
')'
521 { set_dynamic_incdec
($3, $5, $7, TYPE_DEC
); }
526 static void finalize_packet
(void)
528 /* XXX hack ... we allocated one packet pointer too much */
533 static void dump_conf
(void)
537 for
(i
= 0; i
< plen
; ++i
) {
538 printf
("[%zu] pkt\n", i
);
539 printf
(" len %zu cnts %zu rnds %zu\n",
545 for
(j
= 0; j
< packets
[i
].len
; ++j
)
546 printf
("%02x ", packets
[i
].payload
[j
]);
549 for
(j
= 0; j
< packet_dyn
[i
].clen
; ++j
)
550 printf
(" cnt%zu [%u,%u], inc %u, off %ld type %s\n", j
,
551 packet_dyn
[i
].cnt
[j
].min
,
552 packet_dyn
[i
].cnt
[j
].max
,
553 packet_dyn
[i
].cnt
[j
].inc
,
554 packet_dyn
[i
].cnt
[j
].off
,
555 packet_dyn
[i
].cnt
[j
].type
== TYPE_INC ?
558 for
(j
= 0; j
< packet_dyn
[i
].rlen
; ++j
)
559 printf
(" rnd%zu off %ld\n", j
,
560 packet_dyn
[i
].rnd
[j
].off
);
564 void cleanup_packets
(void)
568 for
(i
= 0; i
< plen
; ++i
) {
569 if
(packets
[i
].len
> 0)
570 xfree
(packets
[i
].payload
);
575 for
(i
= 0; i
< dlen
; ++i
) {
576 free
(packet_dyn
[i
].cnt
);
577 free
(packet_dyn
[i
].rnd
);
583 int compile_packets
(char *file
, int verbose
, int cpu
, bool invoke_cpp
)
587 memset
(tmp_file
, 0, sizeof
(tmp_file
));
591 char cmd
[256], *dir
, *base
, *a
, *b
;
593 dir
= dirname
((a
= xstrdup
(file
)));
594 base
= basename
((b
= xstrdup
(file
)));
596 slprintf
(tmp_file
, sizeof
(tmp_file
), "%s/.tmp-%u-%s", dir
, rand
(), base
);
597 slprintf
(cmd
, sizeof
(cmd
), "cpp -I" PREFIX_STRING
598 "/etc/netsniff-ng/ %s > %s", file
, tmp_file
);
606 if
(!strncmp
("-", file
, strlen
("-")))
609 yyin
= fopen
(file
, "r");
611 panic
("Cannot open %s: %s!\n", file
, strerror
(errno
));
617 if
(our_cpu
== 0 && verbose
)
627 void yyerror(const char *err
)
629 panic
("Syntax error at line%d, at char '%s'! %s!\n", yylineno
, yytext
, err
);