Annotation of libwww/Library/src/HTRules.c, revision 2.41
2.26 frystyk 1: /* HTRules.c
2: ** CONFIGURATION MANAGER FOR CLIENTS
3: **
2.32 frystyk 4: ** (c) COPYRIGHT MIT 1995.
2.26 frystyk 5: ** Please first read the full copyright statement in the file COPYRIGH.
2.1 timbl 6: **
2.40 frystyk 7: ** This module manages rule files in the Library
2.1 timbl 8: **
9: ** History:
10: ** 3 Jun 91 Written TBL
11: ** 10 Aug 91 Authorisation added after Daniel Martin (pass, fail)
12: ** Rule order in file changed
13: ** Comments allowed with # on 1st char of rule line
14: ** 17 Jun 92 Bug fix: pass and fail failed if didn't contain '*' TBL
2.9 secret 15: ** 1 Sep 93 Bug fix: no memory check - Nathan Torkington
16: ** BYTE_ADDRESSING removed - Arthur Secret
2.12 luotonen 17: ** 11 Sep 93 MD Changed %i into %d in debug printf.
2.10 duns 18: ** VMS does not recognize %i.
19: ** Bug Fix: in case of PASS, only one parameter to printf.
2.12 luotonen 20: ** 19 Sep 93 AL Added Access Authorization stuff.
21: ** 1 Nov 93 AL Added htbin.
2.15 luotonen 22: ** 30 Nov 93 AL Added HTTranslateReq().
2.19 luotonen 23: ** 4 Feb 94 AL Took away all the daemon-specific stuff.
2.36 frystyk 24: ** 28 Sep 94 HWL Added field to HTPresentation_add call
2.40 frystyk 25: ** 15 Nov 95 HFN Made a stream, fixed interface and made new translater
2.11 luotonen 26: **
2.40 frystyk 27: ** BUGS: We only have one wildcard match pr rule!
2.1 timbl 28: */
29:
2.28 frystyk 30: /* Library include files */
2.34 frystyk 31: #include "WWWLib.h"
2.40 frystyk 32: #include "HTProxy.h"
2.26 frystyk 33: #include "HTRules.h" /* Implemented here */
2.1 timbl 34:
2.40 frystyk 35: struct _HTStream {
36: CONST HTStreamClass * isa;
37: HTRequest * request;
38: HTStream * target;
39: HTChunk * buffer;
40: HTSocketEOL EOLstate;
41: };
42:
43: struct _HTRule {
44: HTRuleOp op;
45: char * pattern;
46: char * replace;
47: int insert; /* Index into any wildcard in replace */
48: };
49:
50: PRIVATE HTList * rules = NULL;
51:
52: /* ------------------------------------------------------------------------- */
53:
54: /*
55: ** Rules are handled as list as everything else that has to do with
56: ** preferences. We provide two functions for getting and setting the
57: ** global rules
2.1 timbl 58: */
2.40 frystyk 59: PUBLIC HTList * HTRule_global (void)
60: {
61: if (!rules) rules = HTList_new();
62: return rules;
63: }
2.1 timbl 64:
2.40 frystyk 65: PUBLIC BOOL HTRule_setGlobal(HTList * list)
66: {
67: if (rules) HTRule_deleteAll(rules);
68: rules = list;
69: return YES;
70: }
2.1 timbl 71:
2.40 frystyk 72: /* Add rule to the list
2.1 timbl 73: ** --------------------
2.40 frystyk 74: ** This function adds a rule to the list of rules. The
75: ** pattern is a 0-terminated string containing a single
76: ** "*". <CODE>equiv</CODE> points to the equivalent string with * for the
77: ** place where the text matched by * goes.
2.1 timbl 78: ** On entry,
79: ** pattern points to 0-terminated string containing a single "*"
2.40 frystyk 80: ** replace points to the equivalent string with * for the
2.1 timbl 81: ** place where the text matched by * goes.
82: ** On exit,
2.40 frystyk 83: ** returns YES if OK, else NO
2.1 timbl 84: */
2.40 frystyk 85: PUBLIC BOOL HTRule_add (HTList * list, HTRuleOp op,
86: CONST char * pattern, CONST char * replace)
2.39 frystyk 87: {
2.40 frystyk 88: if (list && pattern) {
89: HTRule * me = (HTRule *) calloc(1, sizeof(HTRule));
90: if (!me) outofmem(__FILE__, "HTRule_add");
91: me->op = op;
92: StrAllocCopy(me->pattern, pattern);
93: if (replace) {
94: char *ptr = strchr(replace, '*');
95: StrAllocCopy(me->replace, replace);
96: me->insert = ptr ? ptr-replace : -1;
97: if (APP_TRACE)
98: TTYPrint(TDEST, "Rule Add.... For `%s\' op %d `%s\'\n",
99: pattern, op, replace);
100: } else
101: TTYPrint(TDEST, "Rule Add.... For `%s\' op %d\n", pattern, op);
102: return HTList_appendObject(rules, (void *) me);
2.10 duns 103: }
2.40 frystyk 104: return NO;
2.1 timbl 105: }
106:
2.40 frystyk 107: /* Delete all rules
108: ** ----------------
109: ** Deletes all the rules registered by this module
2.1 timbl 110: */
2.40 frystyk 111: PUBLIC BOOL HTRule_deleteAll (HTList * list)
2.1 timbl 112: {
2.40 frystyk 113: if (list) {
114: HTList *cur = list;
115: HTRule *pres;
116: while ((pres = (HTRule *) HTList_nextObject(cur))) {
117: FREE(pres->pattern);
118: FREE(pres->replace);
119: free(pres);
120: }
121: return HTList_delete(list);
2.1 timbl 122: }
2.40 frystyk 123: return NO;
2.1 timbl 124: }
125:
2.40 frystyk 126: /* Translate by rules
2.1 timbl 127: ** ------------------
2.15 luotonen 128: ** The most recently defined rules are applied last.
2.40 frystyk 129: ** This function walks through the list of rules and translates the
130: ** reference when matches are found. The list is traversed in order
131: ** starting from the head of the list. It returns the address of the
132: ** equivalent string allocated from the heap which the CALLER MUST
133: ** FREE.
2.1 timbl 134: */
2.40 frystyk 135: PUBLIC char * HTRule_translate (HTList * list, CONST char * token,
136: BOOL ignore_case)
2.1 timbl 137: {
2.40 frystyk 138: HTRule * pres;
139: char * replace = NULL;
140: if (!token || !list) return NULL;
141: if (APP_TRACE) TTYPrint(TDEST, "Rule Apply.. Translating '%s\'\n", token);
142: while ((pres = (HTRule *) HTList_nextObject(list))) {
143: char * rest = ignore_case ? HTStrCaseMatch(pres->pattern, token) :
144: HTStrMatch(pres->pattern, token);
145: if (!rest) continue; /* No match at all */
146:
147: /* We found a match for this entry, now do operation */
148: switch (pres->op) {
149:
150: case HT_Pass:
151: case HT_Map:
152: if (!pres->replace) { /* No replace */
153: StrAllocCopy(replace, token);
154:
155: } else if (*rest && pres->insert >= 0) {
156: replace = (char *) malloc(strlen(pres->replace)+strlen(rest));
157: if (!replace) outofmem(__FILE__, "HTRule_translate");
158: strcpy(replace, pres->replace);
159: strcpy(replace+pres->insert, rest);
160:
161: } else { /* Perfect match or no insetion point */
162: StrAllocCopy(replace, pres->replace);
163: }
164:
165: if (pres->op == HT_Pass) {
166: if (APP_TRACE)
167: TTYPrint(TDEST, "............ into `%s'\n", replace);
168: return replace;
169: }
170: break;
171:
172: case HT_Fail:
173:
174: default:
175: if (APP_TRACE) TTYPrint(TDEST,"............ FAIL `%s'\n", token);
176: return NULL;
2.1 timbl 177: }
2.40 frystyk 178: }
179: if (!replace) StrAllocCopy(replace, token);
180: return replace;
2.15 luotonen 181: }
182:
2.7 timbl 183: /* Load one line of configuration
184: ** ------------------------------
185: ** Call this, for example, to load a X resource with config info.
2.40 frystyk 186: ** Returns YES if line OK, else NO
2.7 timbl 187: */
2.40 frystyk 188: PUBLIC BOOL HTRule_parseLine (HTList * list, CONST char * config)
2.7 timbl 189: {
190: HTRuleOp op;
191: char * line = NULL;
2.40 frystyk 192: char * ptr;
193: char * word1, * word2, * word3;
2.7 timbl 194: int status;
2.40 frystyk 195: if ((ptr = strchr(config, '#'))) *ptr = '\0';
196: StrAllocCopy(line, config); /* Get our own copy */
197: ptr = line;
198: if ((word1 = HTNextField(&ptr)) == NULL) { /* Empty line */
199: free(line);
200: return YES;
2.7 timbl 201: }
2.40 frystyk 202: if ((word2 = HTNextField(&ptr)) == NULL) {
203: if (APP_TRACE)
204: TTYPrint(TDEST,"Rule Parse.. Insufficient operands: `%s\'\n",line);
2.7 timbl 205: free(line);
2.40 frystyk 206: return NO;
2.7 timbl 207: }
2.40 frystyk 208: word3 = HTNextField(&ptr);
2.7 timbl 209:
2.40 frystyk 210: /* Look for things we recognize */
211: if (!strcasecomp(word1, "addtype")) {
212: double quality;
213: char * encoding = HTNextField(&ptr);
214: status = ptr ? sscanf(ptr, "%lf", &quality) : 0;
2.37 frystyk 215: HTBind_add(word2, /* suffix */
216: word3, /* type */
217: encoding ? encoding : "binary", /* encoding */
2.40 frystyk 218: NULL, /* language */
2.37 frystyk 219: status >= 1? quality : 1.0); /* quality */
2.7 timbl 220:
2.40 frystyk 221: } else if (!strcasecomp(word1, "addencoding")) {
222: double quality;
223: status = ptr ? sscanf(ptr, "%lf", &quality) : 0;
224: HTBind_addEncoding(word2, word3, status >= 1 ? quality : 1.0);
225:
226: } else if (!strcasecomp(word1, "addlanguage")) {
227: double quality;
228: status = ptr ? sscanf(ptr, "%lf", &quality) : 0;
229: HTBind_addLanguage(word2, word3, status >= 1 ? quality : 1.0);
230:
231: } else if (!strcasecomp(word1, "presentation")) {
232: HTList * converters = HTFormat_conversion();
233: double quality, secs, secs_per_byte;
234: status = ptr ? sscanf(ptr,"%lf%lf%lf",&quality,&secs,&secs_per_byte):0;
2.36 frystyk 235: HTPresentation_add(converters, word2, word3, NULL,
2.40 frystyk 236: status >= 1 ? quality : 1.0,
237: status >= 2 ? secs : 0.0,
238: status >= 3 ? secs_per_byte : 0.0);
239:
240: } else if (!strcasecomp(word1, "proxy")) {
241: HTProxy_add(word2, word3);
242:
243: } else if (!strcasecomp(word1, "noproxy")) {
244: int port = 0;
245: status = ptr ? sscanf(ptr, "%d", &port) : 0;
246: HTNoProxy_add(word2, word3, port);
247:
248: } else if (!strcasecomp(word1, "gateway")) {
249: HTGateway_add(word2, word3);
2.12 luotonen 250:
2.7 timbl 251: } else {
252: op = 0==strcasecomp(word1, "map") ? HT_Map
253: : 0==strcasecomp(word1, "pass") ? HT_Pass
254: : 0==strcasecomp(word1, "fail") ? HT_Fail
2.19 luotonen 255: : HT_Invalid;
2.40 frystyk 256: if (op == HT_Invalid) {
257: if (APP_TRACE)
258: TTYPrint(TDEST, "Rule Parse.. Bad or unknown: `%s'\n", config);
259: } else
260: HTRule_add(list, op, word2, word3);
2.7 timbl 261: }
262: free(line);
2.40 frystyk 263: return YES;
2.7 timbl 264: }
265:
2.40 frystyk 266: /*
267: ** Folding is either of CF LWS, LF LWS, CRLF LWS
268: */
269: PRIVATE int HTRule_put_block (HTStream * me, CONST char * b, int l)
270: {
271: while (l > 0) {
272: if (me->EOLstate == EOL_FCR) {
273: if (*b == LF) /* CRLF */
274: me->EOLstate = EOL_FLF;
275: else if (WHITE(*b)) /* Folding: CR SP */
276: me->EOLstate = EOL_DOT;
277: else { /* New line */
278: HTRule_parseLine(rules, HTChunkData(me->buffer));
279: me->EOLstate = EOL_BEGIN;
280: HTChunkClear(me->buffer);
281: continue;
282: }
283: } else if (me->EOLstate == EOL_FLF) {
284: if (WHITE(*b)) /* Folding: LF SP or CR LF SP */
285: me->EOLstate = EOL_DOT;
286: else { /* New line */
287: HTRule_parseLine(rules, HTChunkData(me->buffer));
288: me->EOLstate = EOL_BEGIN;
289: HTChunkClear(me->buffer);
290: continue;
291: }
292: } else if (me->EOLstate == EOL_DOT) {
293: if (WHITE(*b)) {
294: me->EOLstate = EOL_BEGIN;
295: HTChunkPutc(me->buffer, ' ');
296: } else {
297: HTRule_parseLine(rules, HTChunkData(me->buffer));
298: me->EOLstate = EOL_BEGIN;
299: HTChunkClear(me->buffer);
300: continue;
301: }
302: } else if (*b == CR) {
303: me->EOLstate = EOL_FCR;
304: } else if (*b == LF) {
305: me->EOLstate = EOL_FLF; /* Line found */
306: } else
307: HTChunkPutc(me->buffer, *b);
308: l--; b++;
309: }
310: return HT_OK;
311: }
2.1 timbl 312:
2.40 frystyk 313: PRIVATE int HTRule_put_character (HTStream * me, char c)
314: {
315: return HTRule_put_block(me, &c, 1);
316: }
317:
318: PRIVATE int HTRule_put_string (HTStream * me, CONST char * s)
319: {
320: return HTRule_put_block(me, s, (int) strlen(s));
321: }
322:
323: PRIVATE int HTRule_flush (HTStream * me)
324: {
325: return (*me->target->isa->flush)(me->target);
326: }
327:
328: PRIVATE int HTRule_free (HTStream * me)
329: {
330: int status = HT_OK;
331: if (me->target) {
332: if ((status = (*me->target->isa->_free)(me->target)) == HT_WOULD_BLOCK)
333: return HT_WOULD_BLOCK;
334: }
335: if (APP_TRACE)
336: TTYPrint(TDEST, "Rules....... FREEING....\n");
337: HTChunkFree(me->buffer);
338: free(me);
339: return status;
340: }
341:
342: PRIVATE int HTRule_abort (HTStream * me, HTList * e)
343: {
344: int status = HT_ERROR;
345: if (me->target) status = (*me->target->isa->abort)(me->target, e);
346: if (APP_TRACE) TTYPrint(TDEST, "Rules....... ABORTING...\n");
347: HTChunkFree(me->buffer);
348: free(me);
349: return status;
350: }
351:
352: /* Structured Object Class
353: ** -----------------------
2.1 timbl 354: */
2.40 frystyk 355: PRIVATE CONST HTStreamClass HTRuleClass =
356: {
357: "RuleParser",
358: HTRule_flush,
359: HTRule_free,
360: HTRule_abort,
361: HTRule_put_character,
362: HTRule_put_string,
363: HTRule_put_block
364: };
365:
366: PUBLIC HTStream * HTRules (HTRequest * request,
367: void * param,
368: HTFormat input_format,
369: HTFormat output_format,
370: HTStream * output_stream)
2.1 timbl 371: {
2.41 ! frystyk 372: HTAlertCallback *cbf = HTAlert_find(HT_A_CONFIRM);
2.40 frystyk 373: HTStream * me;
2.41 ! frystyk 374: if (cbf && (*cbf)(request, HT_A_CONFIRM, HT_MSG_RULES, NULL, NULL, NULL)) {
2.40 frystyk 375: if ((me = (HTStream *) calloc(1, sizeof(HTStream))) == NULL)
376: outofmem(__FILE__, "HTRules");
377: me->isa = &HTRuleClass;
378: me->request = request;
379: me->target = output_stream;
380: me->buffer = HTChunkCreate(512);
381: me->EOLstate = EOL_BEGIN;
382: if (!rules) rules = HTList_new();
383: } else
384: me = HTBlackHole();
385: return me;
2.1 timbl 386: }
2.11 luotonen 387:
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