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 yy_scan_string
(char *);
39 extern
void yylex_destroy
();
40 extern
void yyerror(const char *);
44 extern
struct packet
*packets
;
47 #define packet_last (plen - 1)
49 #define payload_last (packets[packet_last].len - 1)
51 extern
struct packet_dyn
*packet_dyn
;
54 #define packetd_last (dlen - 1)
56 #define packetdc_last (packet_dyn[packetd_last].clen - 1)
57 #define packetdr_last (packet_dyn[packetd_last].rlen - 1)
58 #define packetds_last (packet_dyn[packetd_last].slen - 1)
60 static int our_cpu
, min_cpu
= -1, max_cpu
= -1;
62 static inline
int test_ignore
(void)
64 if
(min_cpu
< 0 && max_cpu
< 0)
66 else if
(max_cpu
>= our_cpu
&& min_cpu
<= our_cpu
)
72 static inline
void __init_new_packet_slot
(struct packet
*slot
)
78 static inline
void __init_new_counter_slot
(struct packet_dyn
*slot
)
84 static inline
void __init_new_randomizer_slot
(struct packet_dyn
*slot
)
90 static inline
void __init_new_csum_slot
(struct packet_dyn
*slot
)
96 static inline
void __setup_new_counter
(struct counter
*c
, uint8_t start
,
97 uint8_t stop
, uint8_t stepping
,
103 c
->val
= (type
== TYPE_INC
) ? start
: stop
;
104 c
->off
= payload_last
;
108 static inline
void __setup_new_randomizer
(struct randomizer
*r
)
110 r
->off
= payload_last
;
113 static inline
void __setup_new_csum16
(struct csum16
*s
, off_t from
, off_t to
,
116 s
->off
= payload_last
- 1;
122 static void realloc_packet
(void)
128 packets
= xrealloc
(packets
, plen
* sizeof
(*packets
));
130 __init_new_packet_slot
(&packets
[packet_last
]);
133 packet_dyn
= xrealloc
(packet_dyn
, dlen
* sizeof
(*packet_dyn
));
135 __init_new_counter_slot
(&packet_dyn
[packetd_last
]);
136 __init_new_randomizer_slot
(&packet_dyn
[packetd_last
]);
137 __init_new_csum_slot
(&packet_dyn
[packetd_last
]);
140 static void set_byte
(uint8_t val
)
142 struct packet
*pkt
= &packets
[packet_last
];
148 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
149 pkt
->payload
[payload_last
] = val
;
152 static void set_multi_byte
(uint8_t *s
, size_t len
)
156 for
(i
= 0; i
< len
; ++i
)
160 static void set_fill
(uint8_t val
, size_t len
)
163 struct packet
*pkt
= &packets
[packet_last
];
169 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
170 for
(i
= 0; i
< len
; ++i
)
171 pkt
->payload
[payload_last
- i
] = val
;
174 static void __set_csum16_dynamic
(size_t from
, size_t to
, enum csum which
)
176 struct packet
*pkt
= &packets
[packet_last
];
177 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
180 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
183 pktd
->csum
= xrealloc
(pktd
->csum
, pktd
->slen
* sizeof
(struct csum16
));
185 __setup_new_csum16
(&pktd
->csum
[packetds_last
], from
, to
, which
);
188 static void __set_csum16_static
(size_t from
, size_t to
, enum csum which __maybe_unused
)
190 struct packet
*pkt
= &packets
[packet_last
];
194 sum
= htons
(calc_csum
(pkt
->payload
+ from
, to
- from
));
195 psum
= (uint8_t *) &sum
;
201 static inline
bool is_dynamic_csum
(enum csum which
)
214 static void set_csum16
(size_t from
, size_t to
, enum csum which
)
216 struct packet
*pkt
= &packets
[packet_last
];
217 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
229 bug_on
(!(from
< to
));
231 if
(packet_dyn_has_elems
(pktd
) || to
>= pkt
->len || is_dynamic_csum
(which
))
232 __set_csum16_dynamic
(from
, to
, which
);
234 __set_csum16_static
(from
, to
, which
);
237 static void set_rnd
(size_t len
)
240 struct packet
*pkt
= &packets
[packet_last
];
246 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
247 for
(i
= 0; i
< len
; ++i
)
248 pkt
->payload
[payload_last
- i
] = (uint8_t) rand
();
251 static void set_sequential_inc
(uint8_t start
, size_t len
, uint8_t stepping
)
254 struct packet
*pkt
= &packets
[packet_last
];
260 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
261 for
(i
= 0; i
< len
; ++i
) {
262 off_t off
= len
- 1 - i
;
264 pkt
->payload
[payload_last
- off
] = start
;
269 static void set_sequential_dec
(uint8_t start
, size_t len
, uint8_t stepping
)
272 struct packet
*pkt
= &packets
[packet_last
];
278 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
279 for
(i
= 0; i
< len
; ++i
) {
280 int off
= len
- 1 - i
;
282 pkt
->payload
[payload_last
- off
] = start
;
287 static void set_dynamic_rnd
(void)
289 struct packet
*pkt
= &packets
[packet_last
];
290 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
296 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
299 pktd
->rnd
= xrealloc
(pktd
->rnd
, pktd
->rlen
* sizeof
(struct randomizer
));
301 __setup_new_randomizer
(&pktd
->rnd
[packetdr_last
]);
304 static void set_dynamic_incdec
(uint8_t start
, uint8_t stop
, uint8_t stepping
,
307 struct packet
*pkt
= &packets
[packet_last
];
308 struct packet_dyn
*pktd
= &packet_dyn
[packetd_last
];
314 pkt
->payload
= xrealloc
(pkt
->payload
, pkt
->len
);
317 pktd
->cnt
= xrealloc
(pktd
->cnt
, pktd
->clen
* sizeof
(struct counter
));
319 __setup_new_counter
(&pktd
->cnt
[packetdc_last
], start
, stop
, stepping
, type
);
325 long long int number
;
329 %token K_COMMENT K_FILL K_RND K_SEQINC K_SEQDEC K_DRND K_DINC K_DDEC K_WHITE
330 %token K_CPU K_CSUMIP K_CSUMUDP K_CSUMTCP K_CSUMUDP6 K_CSUMTCP6 K_CONST8 K_CONST16 K_CONST32 K_CONST64
332 %token
',' '{' '}' '(' ')' '[' ']' ':' '-' '+' '*' '/' '%' '&' '|' '<' '>' '^'
336 %type
<number
> number expression
339 %left
'-' '+' '*' '/' '%' '&' '|' '<' '>' '^'
346 | packets inline_comment
{ }
347 | packets K_WHITE
{ }
367 | delimiter_nowhite
{ }
371 : '{' noenforce_white payload noenforce_white
'}' {
372 min_cpu
= max_cpu
= -1;
375 | K_CPU
'(' number cpu_delim number
')' ':' noenforce_white
'{' noenforce_white payload noenforce_white
'}' {
379 if
(min_cpu
> max_cpu
) {
388 | K_CPU
'(' number
')' ':' noenforce_white
'{' noenforce_white payload noenforce_white
'}' {
389 min_cpu
= max_cpu
= $3;
396 | payload elem_delimiter
{ }
400 : delimiter_nowhite
{ }
409 : number
{ set_byte
((uint8_t) $1); }
410 |
string { set_multi_byte
((uint8_t *) $1 + 1, strlen
($1) - 2); }
426 | expression
'+' expression
428 | expression
'-' expression
430 | expression
'*' expression
432 | expression
'/' expression
434 | expression
'%' expression
436 | expression
'&' expression
438 | expression
'|' expression
440 | expression
'^' expression
442 | expression
'<' '<' expression
444 | expression
'>' '>' expression
453 : K_FILL
'(' number delimiter number
')'
454 { set_fill
($3, $5); }
458 : K_CONST8
'(' expression
')'
459 { set_byte
((uint8_t) $3); }
460 | K_CONST16
'(' expression
')' {
461 uint16_t __c
= cpu_to_be16
((uint16_t) $3);
463 set_multi_byte
((uint8_t *) &__c
, sizeof
(__c
));
465 | K_CONST32
'(' expression
')' {
466 uint32_t __c
= cpu_to_be32
((uint32_t) $3);
468 set_multi_byte
((uint8_t *) &__c
, sizeof
(__c
));
470 | K_CONST64
'(' expression
')' {
471 uint64_t __c
= cpu_to_be64
((uint64_t) $3);
473 set_multi_byte
((uint8_t *) &__c
, sizeof
(__c
));
478 : K_RND
'(' number
')'
483 : K_CSUMIP
'(' number delimiter number
')'
484 { set_csum16
($3, $5, CSUM_IP
); }
485 | K_CSUMTCP
'(' number delimiter number
')'
486 { set_csum16
($3, $5, CSUM_TCP
); }
487 | K_CSUMUDP
'(' number delimiter number
')'
488 { set_csum16
($3, $5, CSUM_UDP
); }
489 | K_CSUMTCP6
'(' number delimiter number
')'
490 { set_csum16
($3, $5, CSUM_TCP6
); }
491 | K_CSUMUDP6
'(' number delimiter number
')'
492 { set_csum16
($3, $5, CSUM_UDP6
); }
496 : K_SEQINC
'(' number delimiter number
')'
497 { set_sequential_inc
($3, $5, 1); }
498 | K_SEQINC
'(' number delimiter number delimiter number
')'
499 { set_sequential_inc
($3, $5, $7); }
503 : K_SEQDEC
'(' number delimiter number
')'
504 { set_sequential_dec
($3, $5, 1); }
505 | K_SEQDEC
'(' number delimiter number delimiter number
')'
506 { set_sequential_dec
($3, $5, $7); }
511 { set_dynamic_rnd
(); }
512 | K_DRND
'(' number
')'
515 for
(i
= 0; i
< max
; ++i
)
521 : K_DINC
'(' number delimiter number
')'
522 { set_dynamic_incdec
($3, $5, 1, TYPE_INC
); }
523 | K_DINC
'(' number delimiter number delimiter number
')'
524 { set_dynamic_incdec
($3, $5, $7, TYPE_INC
); }
528 : K_DDEC
'(' number delimiter number
')'
529 { set_dynamic_incdec
($3, $5, 1, TYPE_DEC
); }
530 | K_DDEC
'(' number delimiter number delimiter number
')'
531 { set_dynamic_incdec
($3, $5, $7, TYPE_DEC
); }
536 static void finalize_packet
(void)
538 /* XXX hack ... we allocated one packet pointer too much */
543 static void dump_conf
(void)
547 for
(i
= 0; i
< plen
; ++i
) {
548 printf
("[%zu] pkt\n", i
);
549 printf
(" len %zu cnts %zu rnds %zu\n",
555 for
(j
= 0; j
< packets
[i
].len
; ++j
)
556 printf
("%02x ", packets
[i
].payload
[j
]);
559 for
(j
= 0; j
< packet_dyn
[i
].clen
; ++j
)
560 printf
(" cnt%zu [%u,%u], inc %u, off %jd type %s\n", j
,
561 packet_dyn
[i
].cnt
[j
].min
,
562 packet_dyn
[i
].cnt
[j
].max
,
563 packet_dyn
[i
].cnt
[j
].inc
,
564 (intmax_t)packet_dyn
[i
].cnt
[j
].off
,
565 packet_dyn
[i
].cnt
[j
].type
== TYPE_INC ?
568 for
(j
= 0; j
< packet_dyn
[i
].rlen
; ++j
)
569 printf
(" rnd%zu off %jd\n", j
,
570 (intmax_t)packet_dyn
[i
].rnd
[j
].off
);
574 void cleanup_packets
(void)
578 for
(i
= 0; i
< plen
; ++i
) {
579 if
(packets
[i
].len
> 0)
580 xfree
(packets
[i
].payload
);
585 for
(i
= 0; i
< dlen
; ++i
) {
586 free
(packet_dyn
[i
].cnt
);
587 free
(packet_dyn
[i
].rnd
);
593 void compile_packets
(char *file
, bool verbose
, unsigned int cpu
, bool invoke_cpp
)
598 memset
(tmp_file
, 0, sizeof
(tmp_file
));
602 if
(cpp_exec
(file
, tmp_file
, sizeof
(tmp_file
))) {
603 fprintf
(stderr
, "Failed to invoke C preprocessor!\n");
609 if
(!strncmp
("-", file
, strlen
("-")))
612 yyin
= fopen
(file
, "r");
614 fprintf
(stderr
, "Cannot open %s: %s!\n", file
, strerror
(errno
));
623 if
(our_cpu
== 0 && verbose
)
628 if
(yyin
&& yyin
!= stdin
)
637 void compile_packets_str
(char *str
, bool verbose
, unsigned int cpu
)
649 if
(our_cpu
== 0 && verbose
)
660 void yyerror(const char *err
)
662 fprintf
(stderr
, "Syntax error at line %d, char '%s': %s\n", yylineno
, yytext
, err
);