Mercurial > wflogs-daemon
annotate src/wflogs-config.cpp @ 2:400b1de6e1c6
allow multiple config contexts
author | Carl Byington <carl@five-ten-sg.com> |
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date | Fri, 17 May 2013 10:32:12 -0700 |
parents | 0aa1171aebd2 |
children | 37eace15ef87 |
rev | line source |
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0 | 1 /* |
2 | |
2
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3 Copyright (c) 2013 Carl Byington - 510 Software Group, released under |
0 | 4 the GPL version 3 or any later version at your choice available at |
5 http://www.gnu.org/licenses/gpl-3.0.txt | |
6 | |
7 */ | |
8 | |
9 #include "includes.h" | |
10 #include <fcntl.h> | |
11 #include <sys/socket.h> | |
12 #include <netinet/in.h> | |
13 #include <arpa/inet.h> | |
14 #include <netdb.h> | |
15 #include <limits.h> | |
16 | |
17 const char *token_context; | |
18 const char *token_file; | |
19 const char *token_include; | |
20 const char *token_lbrace; | |
21 const char *token_output; | |
22 const char *token_pattern; | |
23 const char *token_period; | |
24 const char *token_rbrace; | |
25 const char *token_semi; | |
26 const char *token_tempin; | |
27 const char *token_versions; | |
28 const char *token_wflogs; | |
29 | |
30 string_set all_strings;// owns all the strings, only modified by the config loader thread | |
31 const int maxlen = 1000; // used for snprintf buffers | |
32 | |
33 | |
34 | |
35 //////////////////////////////////////////////// | |
36 // | |
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37 CONTEXT::CONTEXT(const char *nam) { |
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38 name = nam; |
0 | 39 fd = -1; |
40 len = 0; | |
41 fdo = -1; | |
42 period = 120; | |
43 versions = 3; | |
44 output = NULL; | |
45 tempin = NULL; | |
46 wflogs = NULL; | |
47 fn = NULL; | |
48 pattern = NULL; | |
49 } | |
50 | |
51 | |
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52 CONTEXT::~CONTEXT() { |
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53 free_all(); |
0 | 54 } |
55 | |
56 | |
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57 void CONTEXT::dump() { |
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58 printf("context %s {\n", name); |
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59 printf(" period %d; \n", period); |
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60 printf(" versions %d; \n", versions); |
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61 printf(" output \"%s\";\n", output); |
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62 printf(" tempin \"%s\";\n", tempin); |
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63 printf(" wflogs \"%s\";\n", wflogs); |
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64 printf(" file \"%s\";\n", fn); |
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65 printf(" pattern \"%s\";\n", pattern); |
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66 printf("};\n\n"); |
0 | 67 } |
68 | |
69 | |
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70 void CONTEXT::openo(bool msg) { |
0 | 71 open_time = time(NULL); |
72 fdo = ::creat(tempin, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); | |
73 if (fdo == -1) { | |
74 if (msg) { | |
75 char buf[maxlen]; | |
76 snprintf(buf, sizeof(buf), "wflogs tempin file %s not writeable", tempin); | |
77 tokp->token_error(buf); | |
78 } | |
79 } | |
80 } | |
81 | |
82 | |
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83 void CONTEXT::open(bool msg) { |
0 | 84 fd = ::open(fn, O_RDONLY); |
85 len = 0; | |
86 if (fd == -1) { | |
87 if (msg) { | |
88 char buf[maxlen]; | |
89 snprintf(buf, sizeof(buf), "syslog file %s not readable", fn); | |
90 tokp->token_error(buf); | |
91 } | |
92 } | |
93 else { | |
94 if (debug_syslog > 1) { | |
95 snprintf(buf, sizeof(buf), "syslog file %s opened", fn); | |
96 my_syslog(buf); | |
97 } | |
98 if (msg) lseek(fd, 0, SEEK_END); | |
99 if (fstat(fd, &openfdstat)) { | |
100 close(); | |
101 snprintf(buf, sizeof(buf), "syslog file %s cannot stat after open", fn); | |
102 tokp->token_error(buf); | |
103 } | |
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104 // specify that this fd gets closed on exec, so that wflogs |
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105 // won't have access to it. |
0 | 106 int oldflags = fcntl(fd, F_GETFD, 0); |
107 if (oldflags >= 0) { | |
108 fcntl(fd, F_SETFD, oldflags | FD_CLOEXEC); | |
109 } | |
110 } | |
111 } | |
112 | |
113 | |
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114 bool CONTEXT::write(char *p) { |
0 | 115 // p points to \0 at end of buf, may be destroyed |
116 if (failedo()) { | |
117 openo(false); | |
118 if (failedo()) return false; | |
119 } | |
120 *p = '\n'; | |
121 ::write(fdo, buf, p-buf+1); | |
122 } | |
123 | |
124 | |
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125 bool CONTEXT::read() { |
0 | 126 if (failed()) { |
127 open(false); | |
128 if (failed()) return false; | |
129 } | |
130 int n = ::read(fd, buf+len, buflen-len); | |
131 bool have = (n > 0); | |
132 if (have) { | |
133 len += n; | |
134 while (true) { | |
135 char *p = (char*)memchr(buf, '\n', len); | |
136 if (!p) break; | |
137 n = p-buf; | |
138 *p = '\0'; | |
139 process(p); // process null terminated string, but may destroy the null | |
140 len -= n+1; | |
141 memmove(buf, p+1, len); | |
142 } | |
143 // no <lf> in a full buffer | |
144 if (len == buflen) len = 0; | |
145 } | |
146 else { | |
147 // check for file close | |
148 struct stat filenamest; | |
149 if (0 == stat(fn, &filenamest)) { | |
150 if ((filenamest.st_dev != openfdstat.st_dev) || | |
151 (filenamest.st_ino != openfdstat.st_ino)) { | |
152 close(); | |
153 } | |
154 } | |
155 else { | |
156 // filename no longer exists | |
157 close(); | |
158 } | |
159 } | |
160 check_wflog(); | |
161 return have; | |
162 } | |
163 | |
164 | |
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165 void CONTEXT::closeo() { |
0 | 166 if (fdo != -1) ::close(fdo); |
167 fdo = -1; | |
168 } | |
169 | |
170 | |
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171 void CONTEXT::close() { |
0 | 172 if (debug_syslog > 1) { |
173 snprintf(buf, sizeof(buf), "syslog file %s closed", fn); | |
174 my_syslog(buf); | |
175 } | |
176 if (fd != -1) ::close(fd); | |
177 fd = -1; | |
178 } | |
179 | |
180 | |
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181 void CONTEXT::process(char *p) { |
0 | 182 // p points to \0 at end of buf, may be destroyed |
183 if (pattern) { | |
184 if (0 == regexec(&re, buf, 0, NULL, 0)) { | |
185 if (debug_syslog > 2) { | |
186 my_syslog(buf); // show lines with matches | |
187 } | |
188 write(p); | |
189 } | |
190 } | |
191 } | |
192 | |
193 | |
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194 void CONTEXT::check_wflog() { |
0 | 195 time_t now = time(NULL); |
196 if ((fdo != -1) && (open_time + period < now)) { | |
197 closeo(); | |
198 // rename previous wflog html output files | |
199 char buf[maxlen]; | |
200 char fn1[maxlen]; | |
201 char fn2[maxlen]; | |
202 for (int i=1; i<versions; i++) { | |
203 int j = versions - 1 - i; | |
204 int k = j + 1; | |
205 snprintf(fn1, maxlen, output, j); | |
206 snprintf(fn2, maxlen, output, k); | |
207 snprintf(buf, maxlen, "mv \"%s\" \"%s\"", fn1, fn2); | |
208 system(buf); | |
209 } | |
210 snprintf(buf, maxlen, wflogs, fn1); | |
211 system(buf); | |
212 openo(false); | |
213 } | |
214 } | |
215 | |
216 | |
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217 void CONTEXT::free_all() { |
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218 regfree(&re); |
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219 close(); |
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220 closeo(); |
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221 } |
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222 |
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223 |
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224 //////////////////////////////////////////////// |
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225 // |
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226 CONFIG::CONFIG() { |
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227 reference_count = 0; |
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228 generation = 0; |
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229 load_time = 0; |
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230 } |
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231 |
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232 |
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233 CONFIG::~CONFIG() { |
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234 for (context_list::iterator i=contexts.begin(); i!=contexts.end(); i++) { |
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235 CONTEXT *c = *i; |
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236 delete c; |
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237 } |
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238 } |
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239 |
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240 |
0 | 241 void CONFIG::dump() { |
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242 for (context_list::iterator i=contexts.begin(); i!=contexts.end(); i++) { |
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243 CONTEXTP c = *i; |
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244 c->dump(); |
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245 } |
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246 } |
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247 |
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248 |
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249 bool CONFIG::read() { |
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250 bool rc = false; |
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251 for (context_list::iterator i=contexts.begin(); i!=contexts.end(); i++) { |
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252 CONTEXT *c = *i; |
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253 rc |= c->read(); |
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254 } |
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255 } |
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256 |
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257 void CONFIG::sleep(int duration, time_t &previous) { |
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258 ::sleep(duration); |
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259 time_t now = time(NULL); |
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260 previous = now; |
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261 } |
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262 |
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263 |
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264 void CONFIG::free_all() { |
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265 for (context_list::iterator i=contexts.begin(); i!=contexts.end(); i++) { |
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266 CONTEXT *c = *i; |
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267 c->free_all(); |
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268 } |
0 | 269 } |
270 | |
271 | |
272 //////////////////////////////////////////////// | |
273 // helper to discard the strings held by a string_set | |
274 // | |
275 void discard(string_set &s) { | |
276 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { | |
277 free((void*)*i); | |
278 } | |
279 s.clear(); | |
280 } | |
281 | |
282 | |
283 //////////////////////////////////////////////// | |
284 // helper to register a string in a string set | |
285 // | |
286 const char* register_string(string_set &s, const char *name) { | |
287 string_set::const_iterator i = s.find(name); | |
288 if (i != s.end()) return *i; | |
289 char *x = strdup(name); | |
290 s.insert(x); | |
291 return x; | |
292 } | |
293 | |
294 | |
295 //////////////////////////////////////////////// | |
296 // register a global string | |
297 // | |
298 const char* register_string(const char *name) { | |
299 return register_string(all_strings, name); | |
300 } | |
301 | |
302 | |
303 //////////////////////////////////////////////// | |
304 // clear all global strings, helper for valgrind checking | |
305 // | |
306 void clear_strings() { | |
307 discard(all_strings); | |
308 } | |
309 | |
310 | |
311 //////////////////////////////////////////////// | |
312 // | |
313 bool tsa(TOKEN &tok, const char *token); | |
314 bool tsa(TOKEN &tok, const char *token) { | |
315 const char *have = tok.next(); | |
316 if (have == token) return true; | |
317 tok.token_error(token, have); | |
318 return false; | |
319 } | |
320 | |
321 | |
322 //////////////////////////////////////////////// | |
323 // | |
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324 bool parse_context(TOKEN &tok, CONFIG &dc, CONTEXTP parent); |
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325 bool parse_context(TOKEN &tok, CONFIG &dc, CONTEXTP parent) { |
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326 const char *name = tok.next(); |
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327 if (!tsa(tok, token_lbrace)) return false; |
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328 CONTEXTP con = new CONTEXT(name); |
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329 con->set_token(tok); |
0 | 330 while (true) { |
331 const char *have = tok.next(); | |
332 if (!have) break; | |
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333 if (have == token_rbrace) break; // done |
0 | 334 if (have == token_period) { |
335 have = tok.next(); | |
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336 con->set_period(atoi(have)); |
0 | 337 if (!tsa(tok, token_semi)) return false; |
338 } | |
339 else if (have == token_versions) { | |
340 have = tok.next(); | |
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341 con->set_versions(atoi(have)); |
0 | 342 if (!tsa(tok, token_semi)) return false; |
343 } | |
344 else if (have == token_output) { | |
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345 con->set_output(tok.next()); |
0 | 346 if (!tsa(tok, token_semi)) return false; |
347 } | |
348 else if (have == token_tempin) { | |
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349 con->set_tempin(tok.next()); |
0 | 350 if (!tsa(tok, token_semi)) return false; |
351 } | |
352 else if (have == token_wflogs) { | |
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353 con->set_wflogs(tok.next()); |
0 | 354 if (!tsa(tok, token_semi)) return false; |
355 } | |
356 else if (have == token_file) { | |
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357 con->set_file(tok.next()); |
0 | 358 if (!tsa(tok, token_semi)) return false; |
359 } | |
360 else if (have == token_pattern) { | |
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361 con->pattern = tok.next(); |
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362 int rc = regcomp(&con->re, con->pattern, REG_ICASE | REG_EXTENDED); |
0 | 363 if (rc) { |
364 char bu[maxlen]; | |
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365 regerror(rc, &con->re, bu, maxlen); |
0 | 366 char buf[maxlen]; |
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367 snprintf(buf, sizeof(buf), "pattern %s not valid - %s", con->pattern, bu); |
0 | 368 tok.token_error(buf); |
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369 con->pattern = NULL; |
0 | 370 } |
371 | |
372 if (!tsa(tok, token_semi)) return false; | |
373 } | |
374 else { | |
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375 tok.token_error("period/versions/output/tempin/wflogs/file/pattern", have); |
0 | 376 return false; |
377 } | |
378 } | |
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379 if (!tsa(tok, token_semi)) { |
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380 delete con; |
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381 return false; |
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382 } |
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383 dc.add_context(con); |
0 | 384 return true; |
385 } | |
386 | |
387 | |
388 //////////////////////////////////////////////// | |
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389 // parse a config file |
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390 // |
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391 bool load_conf(CONFIG &dc, const char *fn) { |
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392 int count = 0; |
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393 TOKEN tok(fn, &dc.config_files); |
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394 while (true) { |
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395 const char *have = tok.next(); |
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396 if (!have) break; |
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397 if (have == token_context) { |
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398 if (!parse_context(tok, dc, NULL)) { |
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399 tok.token_error("load_conf() failed to parse context"); |
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400 return false; |
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401 } |
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402 else count++; |
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403 } |
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404 else { |
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405 tok.token_error(token_context, have); |
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406 return false; |
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407 } |
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408 } |
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409 tok.token_error("load_conf() found %d contexts in %s", count, fn); |
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410 return (!dc.contexts.empty()); |
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411 } |
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412 |
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413 |
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414 //////////////////////////////////////////////// |
0 | 415 // init the tokens |
416 // | |
417 void token_init() { | |
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418 token_context = register_string("context"); |
0 | 419 token_file = register_string("file"); |
420 token_include = register_string("include"); | |
421 token_lbrace = register_string("{"); | |
422 token_output = register_string("output"); | |
423 token_pattern = register_string("pattern"); | |
424 token_period = register_string("period"); | |
425 token_rbrace = register_string("}"); | |
426 token_semi = register_string(";"); | |
427 token_tempin = register_string("tempin"); | |
428 token_versions = register_string("versions"); | |
429 token_wflogs = register_string("wflogs"); | |
430 } |