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Commit | Line | Data |
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aba5acdf SH |
1 | %{ |
2 | ||
3 | #include <stdio.h> | |
43cc93e3 | 4 | #include <stdlib.h> |
aba5acdf SH |
5 | #include <malloc.h> |
6 | #include <string.h> | |
7 | #include "ssfilter.h" | |
8 | ||
9 | typedef struct ssfilter * ssfilter_t; | |
10 | ||
11 | #define YYSTYPE ssfilter_t | |
12 | ||
13 | static struct ssfilter * alloc_node(int type, void *pred) | |
14 | { | |
15 | struct ssfilter *n = malloc(sizeof(*n)); | |
16 | if (n == NULL) | |
17 | abort(); | |
18 | n->type = type; | |
19 | n->pred = pred; | |
20 | n->post = NULL; | |
21 | return n; | |
22 | } | |
23 | ||
24 | static char **yy_argv; | |
25 | static int yy_argc; | |
26 | static FILE *yy_fp; | |
27 | static ssfilter_t *yy_ret; | |
7871f7db | 28 | static int tok_type = -1; |
aba5acdf SH |
29 | |
30 | static int yylex(void); | |
31 | ||
32 | static void yyerror(char *s) | |
33 | { | |
34 | fprintf(stderr, "ss: bison bellows (while parsing filter): \"%s!\"", s); | |
35 | } | |
36 | ||
37 | %} | |
38 | ||
ec75249b | 39 | %token HOSTCOND DCOND SCOND DPORT SPORT LEQ GEQ NEQ AUTOBOUND DEVCOND DEVNAME MARKMASK FWMARK |
aba5acdf SH |
40 | %left '|' |
41 | %left '&' | |
42 | %nonassoc '!' | |
43 | ||
44 | %% | |
38d209ec | 45 | applet: exprlist |
aba5acdf | 46 | { |
38d209ec PS |
47 | *yy_ret = $1; |
48 | $$ = $1; | |
aba5acdf SH |
49 | } |
50 | | null | |
51 | ; | |
38d209ec | 52 | |
aba5acdf SH |
53 | null: /* NOTHING */ { $$ = NULL; } |
54 | ; | |
38d209ec | 55 | |
b2038cc0 | 56 | exprlist: expr |
b2038cc0 PS |
57 | | exprlist '|' expr |
58 | { | |
59 | $$ = alloc_node(SSF_OR, $1); | |
60 | $$->post = $3; | |
61 | } | |
62 | | exprlist '&' expr | |
63 | { | |
64 | $$ = alloc_node(SSF_AND, $1); | |
65 | $$->post = $3; | |
66 | } | |
67 | | exprlist expr | |
68 | { | |
69 | $$ = alloc_node(SSF_AND, $1); | |
70 | $$->post = $2; | |
71 | } | |
72 | ; | |
73 | ||
38d209ec PS |
74 | eq: '=' |
75 | | /* nothing */ | |
76 | ; | |
77 | ||
78 | expr: '(' exprlist ')' | |
79 | { | |
80 | $$ = $2; | |
81 | } | |
6495bca9 PS |
82 | | '!' expr |
83 | { | |
84 | $$ = alloc_node(SSF_NOT, $2); | |
85 | } | |
38d209ec | 86 | | DCOND eq HOSTCOND |
aba5acdf | 87 | { |
38d209ec | 88 | $$ = alloc_node(SSF_DCOND, $3); |
aba5acdf | 89 | } |
38d209ec | 90 | | SCOND eq HOSTCOND |
ae665a52 | 91 | { |
38d209ec | 92 | $$ = alloc_node(SSF_SCOND, $3); |
aba5acdf SH |
93 | } |
94 | | DPORT GEQ HOSTCOND | |
95 | { | |
96 | $$ = alloc_node(SSF_D_GE, $3); | |
97 | } | |
98 | | DPORT LEQ HOSTCOND | |
99 | { | |
100 | $$ = alloc_node(SSF_D_LE, $3); | |
101 | } | |
102 | | DPORT '>' HOSTCOND | |
103 | { | |
104 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_D_LE, $3)); | |
105 | } | |
106 | | DPORT '<' HOSTCOND | |
107 | { | |
108 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_D_GE, $3)); | |
109 | } | |
38d209ec | 110 | | DPORT eq HOSTCOND |
aba5acdf SH |
111 | { |
112 | $$ = alloc_node(SSF_DCOND, $3); | |
113 | } | |
114 | | DPORT NEQ HOSTCOND | |
115 | { | |
116 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_DCOND, $3)); | |
117 | } | |
118 | ||
119 | | SPORT GEQ HOSTCOND | |
120 | { | |
121 | $$ = alloc_node(SSF_S_GE, $3); | |
122 | } | |
123 | | SPORT LEQ HOSTCOND | |
124 | { | |
125 | $$ = alloc_node(SSF_S_LE, $3); | |
126 | } | |
127 | | SPORT '>' HOSTCOND | |
128 | { | |
129 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_S_LE, $3)); | |
130 | } | |
131 | | SPORT '<' HOSTCOND | |
132 | { | |
133 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_S_GE, $3)); | |
134 | } | |
38d209ec | 135 | | SPORT eq HOSTCOND |
aba5acdf SH |
136 | { |
137 | $$ = alloc_node(SSF_SCOND, $3); | |
138 | } | |
139 | | SPORT NEQ HOSTCOND | |
140 | { | |
141 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_SCOND, $3)); | |
142 | } | |
38d209ec | 143 | | DEVNAME eq DEVCOND |
2d293212 DA |
144 | { |
145 | $$ = alloc_node(SSF_DEVCOND, $3); | |
146 | } | |
147 | | DEVNAME NEQ DEVCOND | |
148 | { | |
149 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_DEVCOND, $3)); | |
150 | } | |
38d209ec | 151 | | FWMARK eq MARKMASK |
ec75249b LC |
152 | { |
153 | $$ = alloc_node(SSF_MARKMASK, $3); | |
154 | } | |
155 | | FWMARK NEQ MARKMASK | |
156 | { | |
157 | $$ = alloc_node(SSF_NOT, alloc_node(SSF_MARKMASK, $3)); | |
158 | } | |
aba5acdf SH |
159 | | AUTOBOUND |
160 | { | |
161 | $$ = alloc_node(SSF_S_AUTO, NULL); | |
162 | } | |
aba5acdf SH |
163 | ; |
164 | %% | |
165 | ||
166 | static char *get_token_from_line(char **ptr) | |
167 | { | |
168 | char *tok, *cp = *ptr; | |
169 | ||
170 | while (*cp == ' ' || *cp == '\t') cp++; | |
171 | ||
172 | if (*cp == 0) { | |
173 | *ptr = cp; | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | tok = cp; | |
178 | ||
179 | while (*cp != 0 && *cp != ' ' && *cp != '\t') { | |
180 | /* Backslash escapes everything. */ | |
181 | if (*cp == '\\') { | |
182 | char *tp; | |
183 | for (tp = cp; tp != tok; tp--) | |
184 | *tp = *(tp-1); | |
185 | cp++; | |
186 | tok++; | |
187 | if (*cp == 0) | |
188 | break; | |
189 | } | |
190 | cp++; | |
191 | } | |
192 | if (*cp) | |
193 | *cp++ = 0; | |
194 | *ptr = cp; | |
195 | return tok; | |
196 | } | |
197 | ||
198 | int yylex(void) | |
199 | { | |
200 | static char argbuf[1024]; | |
201 | static char *tokptr = argbuf; | |
202 | static int argc; | |
203 | char *curtok; | |
204 | ||
205 | do { | |
206 | while (*tokptr == 0) { | |
207 | tokptr = NULL; | |
208 | if (argc < yy_argc) { | |
209 | tokptr = yy_argv[argc]; | |
210 | argc++; | |
211 | } else if (yy_fp) { | |
212 | while (tokptr == NULL) { | |
50735818 SH |
213 | size_t len; |
214 | ||
215 | if (fgets(argbuf, sizeof(argbuf), yy_fp) == NULL) | |
aba5acdf | 216 | return 0; |
50735818 SH |
217 | |
218 | len = strnlen(argbuf, sizeof(argbuf)); | |
219 | if (len == 0) { | |
220 | fprintf(stderr, "Invalid line\n"); | |
221 | exit(-1); | |
222 | } | |
223 | ||
224 | if (len >= sizeof(argbuf) - 1) { | |
225 | fprintf(stderr, "Too long line in filter\n"); | |
aba5acdf SH |
226 | exit(-1); |
227 | } | |
50735818 SH |
228 | if (argbuf[len - 1] == '\n') |
229 | argbuf[len-1] = 0; | |
aba5acdf SH |
230 | if (argbuf[0] == '#' || argbuf[0] == '0') |
231 | continue; | |
232 | tokptr = argbuf; | |
233 | } | |
234 | } else { | |
235 | return 0; | |
236 | } | |
237 | } | |
238 | } while ((curtok = get_token_from_line(&tokptr)) == NULL); | |
239 | ||
240 | if (strcmp(curtok, "!") == 0 || | |
241 | strcmp(curtok, "not") == 0) | |
242 | return '!'; | |
243 | if (strcmp(curtok, "&") == 0 || | |
244 | strcmp(curtok, "&&") == 0 || | |
245 | strcmp(curtok, "and") == 0) | |
246 | return '&'; | |
247 | if (strcmp(curtok, "|") == 0 || | |
248 | strcmp(curtok, "||") == 0 || | |
249 | strcmp(curtok, "or") == 0) | |
250 | return '|'; | |
251 | if (strcmp(curtok, "(") == 0) | |
252 | return '('; | |
253 | if (strcmp(curtok, ")") == 0) | |
254 | return ')'; | |
7871f7db VK |
255 | if (strcmp(curtok, "dst") == 0) { |
256 | tok_type = DCOND; | |
aba5acdf | 257 | return DCOND; |
7871f7db VK |
258 | } |
259 | if (strcmp(curtok, "src") == 0) { | |
260 | tok_type = SCOND; | |
aba5acdf | 261 | return SCOND; |
7871f7db VK |
262 | } |
263 | if (strcmp(curtok, "dport") == 0) { | |
264 | tok_type = DPORT; | |
aba5acdf | 265 | return DPORT; |
7871f7db VK |
266 | } |
267 | if (strcmp(curtok, "sport") == 0) { | |
268 | tok_type = SPORT; | |
aba5acdf | 269 | return SPORT; |
7871f7db | 270 | } |
2d293212 DA |
271 | if (strcmp(curtok, "dev") == 0) { |
272 | tok_type = DEVNAME; | |
273 | return DEVNAME; | |
274 | } | |
ec75249b LC |
275 | if (strcmp(curtok, "fwmark") == 0) { |
276 | tok_type = FWMARK; | |
277 | return FWMARK; | |
278 | } | |
aba5acdf SH |
279 | if (strcmp(curtok, ">=") == 0 || |
280 | strcmp(curtok, "ge") == 0 || | |
281 | strcmp(curtok, "geq") == 0) | |
282 | return GEQ; | |
283 | if (strcmp(curtok, "<=") == 0 || | |
284 | strcmp(curtok, "le") == 0 || | |
285 | strcmp(curtok, "leq") == 0) | |
286 | return LEQ; | |
287 | if (strcmp(curtok, "!=") == 0 || | |
288 | strcmp(curtok, "ne") == 0 || | |
289 | strcmp(curtok, "neq") == 0) | |
290 | return NEQ; | |
291 | if (strcmp(curtok, "=") == 0 || | |
292 | strcmp(curtok, "==") == 0 || | |
293 | strcmp(curtok, "eq") == 0) | |
294 | return '='; | |
295 | if (strcmp(curtok, ">") == 0 || | |
296 | strcmp(curtok, "gt") == 0) | |
297 | return '>'; | |
298 | if (strcmp(curtok, "<") == 0 || | |
299 | strcmp(curtok, "lt") == 0) | |
300 | return '<'; | |
7871f7db VK |
301 | if (strcmp(curtok, "autobound") == 0) { |
302 | tok_type = AUTOBOUND; | |
aba5acdf | 303 | return AUTOBOUND; |
7871f7db | 304 | } |
2d293212 DA |
305 | if (tok_type == DEVNAME) { |
306 | yylval = (void*)parse_devcond(curtok); | |
307 | if (yylval == NULL) { | |
308 | fprintf(stderr, "Cannot parse device.\n"); | |
309 | exit(1); | |
310 | } | |
311 | return DEVCOND; | |
312 | } | |
ec75249b LC |
313 | if (tok_type == FWMARK) { |
314 | yylval = (void*)parse_markmask(curtok); | |
315 | if (yylval == NULL) { | |
316 | fprintf(stderr, "Cannot parse mark %s.\n", curtok); | |
317 | exit(1); | |
318 | } | |
319 | return MARKMASK; | |
320 | } | |
7871f7db | 321 | yylval = (void*)parse_hostcond(curtok, tok_type == SPORT || tok_type == DPORT); |
aba5acdf SH |
322 | if (yylval == NULL) { |
323 | fprintf(stderr, "Cannot parse dst/src address.\n"); | |
324 | exit(1); | |
325 | } | |
326 | return HOSTCOND; | |
327 | } | |
328 | ||
329 | int ssfilter_parse(struct ssfilter **f, int argc, char **argv, FILE *fp) | |
330 | { | |
331 | yy_argc = argc; | |
332 | yy_argv = argv; | |
333 | yy_fp = fp; | |
334 | yy_ret = f; | |
335 | ||
336 | if (yyparse()) { | |
337 | fprintf(stderr, " Sorry.\n"); | |
338 | return -1; | |
339 | } | |
340 | return 0; | |
341 | } |