9 typedef struct ssfilter * ssfilter_t;
11 #define YYSTYPE ssfilter_t
13 static struct ssfilter * alloc_node(int type, void *pred)
15 struct ssfilter *n = malloc(sizeof(*n));
24 static char **yy_argv;
27 static ssfilter_t *yy_ret;
29 static int yylex(void);
31 static void yyerror(char *s)
33 fprintf(stderr, "ss: bison bellows (while parsing filter): \"%s!\"", s);
38 %token HOSTCOND DCOND SCOND DPORT SPORT LEQ GEQ NEQ AUTOBOUND
51 null: /* NOTHING */ { $$ = NULL; }
55 $$ = alloc_node(SSF_DCOND, $2);
59 $$ = alloc_node(SSF_SCOND, $2);
63 $$ = alloc_node(SSF_D_GE, $3);
67 $$ = alloc_node(SSF_D_LE, $3);
71 $$ = alloc_node(SSF_NOT, alloc_node(SSF_D_LE, $3));
75 $$ = alloc_node(SSF_NOT, alloc_node(SSF_D_GE, $3));
79 $$ = alloc_node(SSF_DCOND, $3);
83 $$ = alloc_node(SSF_NOT, alloc_node(SSF_DCOND, $3));
88 $$ = alloc_node(SSF_S_GE, $3);
92 $$ = alloc_node(SSF_S_LE, $3);
96 $$ = alloc_node(SSF_NOT, alloc_node(SSF_S_LE, $3));
100 $$ = alloc_node(SSF_NOT, alloc_node(SSF_S_GE, $3));
104 $$ = alloc_node(SSF_SCOND, $3);
108 $$ = alloc_node(SSF_NOT, alloc_node(SSF_SCOND, $3));
113 $$ = alloc_node(SSF_S_AUTO, NULL);
117 $$ = alloc_node(SSF_OR, $1);
122 $$ = alloc_node(SSF_AND, $1);
128 $$ = alloc_node(SSF_AND, $1);
133 $$ = alloc_node(SSF_NOT, $2);
142 static char *get_token_from_line(char **ptr)
144 char *tok, *cp = *ptr;
146 while (*cp == ' ' || *cp == '\t') cp++;
155 while (*cp != 0 && *cp != ' ' && *cp != '\t') {
156 /* Backslash escapes everything. */
159 for (tp = cp; tp != tok; tp--)
176 static char argbuf[1024];
177 static char *tokptr = argbuf;
182 while (*tokptr == 0) {
184 if (argc < yy_argc) {
185 tokptr = yy_argv[argc];
188 while (tokptr == NULL) {
189 if (fgets(argbuf, sizeof(argbuf)-1, yy_fp) == NULL)
191 argbuf[sizeof(argbuf)-1] = 0;
192 if (strlen(argbuf) == sizeof(argbuf) - 1) {
193 fprintf(stderr, "Too long line in filter");
196 if (argbuf[strlen(argbuf)-1] == '\n')
197 argbuf[strlen(argbuf)-1] = 0;
198 if (argbuf[0] == '#' || argbuf[0] == '0')
206 } while ((curtok = get_token_from_line(&tokptr)) == NULL);
208 if (strcmp(curtok, "!") == 0 ||
209 strcmp(curtok, "not") == 0)
211 if (strcmp(curtok, "&") == 0 ||
212 strcmp(curtok, "&&") == 0 ||
213 strcmp(curtok, "and") == 0)
215 if (strcmp(curtok, "|") == 0 ||
216 strcmp(curtok, "||") == 0 ||
217 strcmp(curtok, "or") == 0)
219 if (strcmp(curtok, "(") == 0)
221 if (strcmp(curtok, ")") == 0)
223 if (strcmp(curtok, "dst") == 0)
225 if (strcmp(curtok, "src") == 0)
227 if (strcmp(curtok, "dport") == 0)
229 if (strcmp(curtok, "sport") == 0)
231 if (strcmp(curtok, ">=") == 0 ||
232 strcmp(curtok, "ge") == 0 ||
233 strcmp(curtok, "geq") == 0)
235 if (strcmp(curtok, "<=") == 0 ||
236 strcmp(curtok, "le") == 0 ||
237 strcmp(curtok, "leq") == 0)
239 if (strcmp(curtok, "!=") == 0 ||
240 strcmp(curtok, "ne") == 0 ||
241 strcmp(curtok, "neq") == 0)
243 if (strcmp(curtok, "=") == 0 ||
244 strcmp(curtok, "==") == 0 ||
245 strcmp(curtok, "eq") == 0)
247 if (strcmp(curtok, ">") == 0 ||
248 strcmp(curtok, "gt") == 0)
250 if (strcmp(curtok, "<") == 0 ||
251 strcmp(curtok, "lt") == 0)
253 if (strcmp(curtok, "autobound") == 0)
255 yylval = (void*)parse_hostcond(curtok);
256 if (yylval == NULL) {
257 fprintf(stderr, "Cannot parse dst/src address.\n");
263 int ssfilter_parse(struct ssfilter **f, int argc, char **argv, FILE *fp)
271 fprintf(stderr, " Sorry.\n");