1 /*****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2003
3 *****************************************************************************
4 * rrd_cgi.c RRD Web Page Generator
5 *****************************************************************************/
7 #include "rrd_tool.h"
8 #include <cgi.h>
9 #include <time.h>
12 #define MEMBLK 1024
13 /*#define DEBUG_PARSER
14 #define DEBUG_VARS*/
16 /* global variable for libcgi */
17 s_cgi **cgiArg;
19 /* in arg[0] find tags beginning with arg[1] call arg[2] on them
20 and replace by result of arg[2] call */
21 int parse(char **, long, char *, char *(*)(long , char **));
23 /**************************************************/
24 /* tag replacers ... they are called from parse */
25 /* through function pointers */
26 /**************************************************/
28 /* return cgi var named arg[0] */
29 char* cgiget(long , char **);
31 /* return a quoted cgi var named arg[0] */
32 char* cgigetq(long , char **);
34 /* return a quoted and sanitized cgi variable */
35 char* cgigetqp(long , char **);
37 /* call rrd_graph and insert appropriate image tag */
38 char* drawgraph(long, char **);
40 /* return PRINT functions from last rrd_graph call */
41 char* drawprint(long, char **);
43 /* pretty-print the <last></last> value for some.rrd via strftime() */
44 char* printtimelast(long, char **);
46 /* pretty-print current time */
47 char* printtimenow(long,char **);
49 /* set an environment variable */
50 char* rrdsetenv(long, char **);
52 /* get an environment variable */
53 char* rrdgetenv(long, char **);
55 /* include the named file at this point */
56 char* includefile(long, char **);
58 /* for how long is the output of the cgi valid ? */
59 char* rrdgoodfor(long, char **);
61 char* rrdstrip(char *buf);
62 char* scanargs(char *line, int *argc, char ***args);
64 /* format at-time specified times using strftime */
65 char* printstrftime(long, char**);
67 /** HTTP protocol needs special format, and GMT time **/
68 char *http_time(time_t *);
70 /* return a pointer to newly allocated copy of this string */
71 char *stralloc(const char *);
74 /* rrd interface to the variable functions {put,get}var() */
75 char* rrdgetvar(long argc, char **args);
76 char* rrdsetvar(long argc, char **args);
77 char* rrdsetvarconst(long argc, char **args);
80 /* variable store: put/get key-value pairs */
81 static int initvar();
82 static void donevar();
83 static const char* getvar(const char* varname);
84 static const char* putvar(const char* name, const char* value, int is_const);
86 /* key value pair that makes up an entry in the variable store */
87 typedef struct
88 {
89 int is_const; /* const variable or not */
90 const char* name; /* variable name */
91 const char* value; /* variable value */
92 } vardata;
94 /* the variable heap:
95 start with a heapsize of 10 variables */
96 #define INIT_VARSTORE_SIZE 10
97 static vardata* varheap = NULL;
98 static size_t varheap_size = 0;
100 /* allocate and initialize variable heap */
101 static int
102 initvar()
103 {
104 varheap = (vardata*)malloc(sizeof(vardata) * INIT_VARSTORE_SIZE);
105 if (varheap == NULL) {
106 fprintf(stderr, "ERROR: unable to initialize variable store\n");
107 return -1;
108 }
109 memset(varheap, 0, sizeof(vardata) * INIT_VARSTORE_SIZE);
110 varheap_size = INIT_VARSTORE_SIZE;
111 return 0;
112 }
114 /* cleanup: free allocated memory */
115 static void
116 donevar()
117 {
118 int i;
119 if (varheap) {
120 for (i=0; i<varheap_size; i++) {
121 if (varheap[i].name) {
122 free((char*)varheap[i].name);
123 }
124 if (varheap[i].value) {
125 free((char*)varheap[i].value);
126 }
127 }
128 free(varheap);
129 }
130 }
132 /* Get a variable from the variable store.
133 Return NULL in case the requested variable was not found. */
134 static const char*
135 getvar(const char* name)
136 {
137 int i;
138 for (i=0; i<varheap_size && varheap[i].name; i++) {
139 if (0 == strcmp(name, varheap[i].name)) {
140 #ifdef DEBUG_VARS
141 printf("<!-- getvar(%s) -> %s -->\n", name, varheap[i].value);
142 #endif
143 return varheap[i].value;
144 }
145 }
146 #ifdef DEBUG_VARS
147 printf("<!-- getvar(%s) -> Not found-->\n", name);
148 #endif
149 return NULL;
150 }
152 /* Put a variable into the variable store. If a variable by that
153 name exists, it's value is overwritten with the new value unless it was
154 marked as 'const' (initialized by RRD::SETCONSTVAR).
155 Returns a copy the newly allocated value on success, NULL on error. */
156 static const char*
157 putvar(const char* name, const char* value, int is_const)
158 {
159 int i;
160 for (i=0; i < varheap_size && varheap[i].name; i++) {
161 if (0 == strcmp(name, varheap[i].name)) {
162 /* overwrite existing entry */
163 if (varheap[i].is_const) {
164 #ifdef DEBUG_VARS
165 printf("<!-- setver(%s, %s): not assigning: "
166 "const variable -->\n", name, value);
167 # endif
168 return varheap[i].value;
169 }
170 #ifdef DEBUG_VARS
171 printf("<!-- setvar(%s, %s): overwriting old value (%s) -->\n",
172 name, value, varheap[i].value);
173 #endif
174 /* make it possible to promote a variable to readonly */
175 varheap[i].is_const = is_const;
176 free((char*)varheap[i].value);
177 varheap[i].value = stralloc(value);
178 return varheap[i].value;
179 }
180 }
182 /* no existing variable found by that name, add it */
183 if (i == varheap_size) {
184 /* ran out of heap: resize heap to double size */
185 size_t new_size = varheap_size * 2;
186 varheap = (vardata*)(realloc(varheap, sizeof(vardata) * new_size));
187 if (!varheap) {
188 fprintf(stderr, "ERROR: Unable to realloc variable heap\n");
189 return NULL;
190 }
191 /* initialize newly allocated memory */;
192 memset(&varheap[varheap_size], 0, sizeof(vardata) * varheap_size);
193 varheap_size = new_size;
194 }
195 varheap[i].is_const = is_const;
196 varheap[i].name = stralloc(name);
197 varheap[i].value = stralloc(value);
199 #ifdef DEBUG_VARS
200 printf("<!-- setvar(%s, %s): adding new variable -->\n", name, value);
201 #endif
202 return varheap[i].value;
203 }
205 /* expand those RRD:* directives that can be used recursivly */
206 static char*
207 rrd_expand_vars(char* buffer)
208 {
209 int i;
211 #ifdef DEBUG_PARSER
212 printf("expanding variables in '%s'\n", buffer);
213 #endif
215 for (i=0; buffer[i]; i++) {
216 if (buffer[i] != '<')
217 continue;
218 parse(&buffer, i, "<RRD::CV", cgiget);
219 parse(&buffer, i, "<RRD::CV::QUOTE", cgigetq);
220 parse(&buffer, i, "<RRD::CV::PATH", cgigetqp);
221 parse(&buffer, i, "<RRD::GETENV", rrdgetenv);
222 parse(&buffer, i, "<RRD::GETVAR", rrdgetvar);
223 }
224 return buffer;
225 }
227 static long goodfor=0;
228 static char **calcpr=NULL;
229 static void calfree (void){
230 if (calcpr) {
231 long i;
232 for(i=0;calcpr[i];i++){
233 if (calcpr[i]){
234 free(calcpr[i]);
235 }
236 }
237 if (calcpr) {
238 free(calcpr);
239 }
240 }
241 }
243 /* create freeable version of the string */
244 char * stralloc(const char *str){
245 char* nstr;
246 if (!str) {
247 return NULL;
248 }
249 nstr = malloc((strlen(str)+1));
250 strcpy(nstr,str);
251 return(nstr);
252 }
254 int main(int argc, char *argv[]) {
255 long length;
256 char *buffer;
257 char *server_url = NULL;
258 long i;
259 long filter=0;
260 #ifdef MUST_DISABLE_SIGFPE
261 signal(SIGFPE,SIG_IGN);
262 #endif
263 #ifdef MUST_DISABLE_FPMASK
264 fpsetmask(0);
265 #endif
266 /* what do we get for cmdline arguments?
267 for (i=0;i<argc;i++)
268 printf("%d-'%s'\n",i,argv[i]); */
269 while (1) {
270 static struct option long_options[] = {
271 { "filter", no_argument, 0, 'f' },
272 { 0, 0, 0, 0}
273 };
274 int option_index = 0;
275 int opt;
276 opt = getopt_long(argc, argv, "f", long_options, &option_index);
277 if (opt == EOF) {
278 break;
279 }
281 switch(opt) {
282 case 'f':
283 filter=1;
284 break;
285 case '?':
286 printf("unknown commandline option '%s'\n",argv[optind-1]);
287 return -1;
288 }
289 }
291 if (!filter) {
292 cgiDebug(0,0);
293 cgiArg = cgiInit();
294 server_url = getenv("SERVER_URL");
295 }
297 /* make sure we have one extra argument,
298 if there are others, we do not care Apache gives several */
300 /* if ( (optind != argc-2
301 && strstr( getenv("SERVER_SOFTWARE"),"Apache/2") != NULL)
302 && optind != argc-1) { */
304 if ( optind >= argc ) {
305 fprintf(stderr, "ERROR: expected a filename\n");
306 exit(1);
307 } else {
308 length = readfile(argv[optind], &buffer, 1);
309 }
311 if(rrd_test_error()) {
312 fprintf(stderr, "ERROR: %s\n",rrd_get_error());
313 exit(1);
314 }
316 /* initialize variable heap */
317 initvar();
319 /* expand rrd directives in buffer recursivly */
320 for (i=0; buffer[i]; i++) {
321 if (buffer[i] != '<')
322 continue;
323 if (!filter) {
324 parse(&buffer, i, "<RRD::CV", cgiget);
325 parse(&buffer, i, "<RRD::CV::PATH", cgigetqp);
326 parse(&buffer, i, "<RRD::CV::QUOTE", cgigetq);
327 parse(&buffer, i, "<RRD::GETENV", rrdgetenv);
328 }
329 parse(&buffer, i, "<RRD::GETVAR", rrdgetvar);
330 parse(&buffer, i, "<RRD::GOODFOR", rrdgoodfor);
331 parse(&buffer, i, "<RRD::GRAPH", drawgraph);
332 parse(&buffer, i, "<RRD::INCLUDE", includefile);
333 parse(&buffer, i, "<RRD::PRINT", drawprint);
334 parse(&buffer, i, "<RRD::SETCONSTVAR", rrdsetvarconst);
335 parse(&buffer, i, "<RRD::SETENV", rrdsetenv);
336 parse(&buffer, i, "<RRD::SETVAR", rrdsetvar);
337 parse(&buffer, i, "<RRD::TIME::LAST", printtimelast);
338 parse(&buffer, i, "<RRD::TIME::NOW", printtimenow);
339 parse(&buffer, i, "<RRD::TIME::STRFTIME", printstrftime);
340 }
342 if (!filter) {
343 printf ("Content-Type: text/html\n"
344 "Content-Length: %d\n",
345 strlen(buffer));
347 if (labs(goodfor) > 0) {
348 time_t now;
349 now = time(NULL);
350 printf("Last-Modified: %s\n", http_time(&now));
351 now += labs(goodfor);
352 printf("Expires: %s\n", http_time(&now));
353 if (goodfor < 0) {
354 printf("Refresh: %ld\n", labs(goodfor));
355 }
356 }
357 printf("\n");
358 }
360 /* output result */
361 printf("%s", buffer);
363 /* cleanup */
364 calfree();
365 if (buffer){
366 free(buffer);
367 }
368 donevar();
369 exit(0);
370 }
372 /* remove occurrences of .. this is a general measure to make
373 paths which came in via cgi do not go UP ... */
375 char* rrdsetenv(long argc, char **args) {
376 if (argc >= 2) {
377 char *xyz = malloc((strlen(args[0]) + strlen(args[1]) + 2));
378 if (xyz == NULL) {
379 return stralloc("[ERROR: allocating setenv buffer]");
380 };
381 sprintf(xyz, "%s=%s", args[0], args[1]);
382 if(putenv(xyz) == -1) {
383 free(xyz);
384 return stralloc("[ERROR: failed to do putenv]");
385 };
386 }
387 return stralloc("[ERROR: setenv failed because not enough "
388 "arguments were defined]");
389 }
391 /* rrd interface to the variable function putvar() */
392 char*
393 rrdsetvar(long argc, char **args)
394 {
395 if (argc >= 2)
396 {
397 const char* result = putvar(args[0], args[1], 0 /* not const */);
398 if (result) {
399 /* setvar does not return the value set */
400 return stralloc("");
401 }
402 return stralloc("[ERROR: putvar failed]");
403 }
404 return stralloc("[ERROR: putvar failed because not enough arguments "
405 "were defined]");
406 }
408 /* rrd interface to the variable function putvar() */
409 char*
410 rrdsetvarconst(long argc, char **args)
411 {
412 if (argc >= 2)
413 {
414 const char* result = putvar(args[0], args[1], 1 /* const */);
415 if (result) {
416 /* setvar does not return the value set */
417 return stralloc("");
418 }
419 return stralloc("[ERROR: putvar failed]");
420 }
421 return stralloc("[ERROR: putvar failed because not enough arguments "
422 "were defined]");
423 }
425 char* rrdgetenv(long argc, char **args) {
426 char buf[128];
427 const char* envvar;
428 if (argc != 1) {
429 return stralloc("[ERROR: getenv failed because it did not "
430 "get 1 argument only]");
431 };
432 envvar = getenv(args[0]);
433 if (envvar) {
434 return stralloc(envvar);
435 } else {
436 snprintf(buf, sizeof(buf), "[ERROR:_getenv_'%s'_failed", args[0]);
437 return stralloc(buf);
438 }
439 }
441 char* rrdgetvar(long argc, char **args) {
442 char buf[128];
443 const char* value;
444 if (argc != 1) {
445 return stralloc("[ERROR: getvar failed because it did not "
446 "get 1 argument only]");
447 };
448 value = getvar(args[0]);
449 if (value) {
450 return stralloc(value);
451 } else {
452 snprintf(buf, sizeof(buf), "[ERROR:_getvar_'%s'_failed", args[0]);
453 return stralloc(buf);
454 }
455 }
457 char* rrdgoodfor(long argc, char **args){
458 if (argc == 1) {
459 goodfor = atol(args[0]);
460 } else {
461 return stralloc("[ERROR: goodfor expected 1 argument]");
462 }
464 if (goodfor == 0){
465 return stralloc("[ERROR: goodfor value must not be 0]");
466 }
468 return stralloc("");
469 }
471 /* Format start or end times using strftime. We always need both the
472 * start and end times, because, either might be relative to the other.
473 * */
474 #define MAX_STRFTIME_SIZE 256
475 char* printstrftime(long argc, char **args){
476 struct rrd_time_value start_tv, end_tv;
477 char *parsetime_error = NULL;
478 char formatted[MAX_STRFTIME_SIZE];
479 struct tm *the_tm;
480 time_t start_tmp, end_tmp;
482 /* Make sure that we were given the right number of args */
483 if( argc != 4) {
484 rrd_set_error( "wrong number of args %d", argc);
485 return (char *) -1;
486 }
488 /* Init start and end time */
489 parsetime("end-24h", &start_tv);
490 parsetime("now", &end_tv);
492 /* Parse the start and end times we were given */
493 if( (parsetime_error = parsetime( args[1], &start_tv))) {
494 rrd_set_error( "start time: %s", parsetime_error);
495 return (char *) -1;
496 }
497 if( (parsetime_error = parsetime( args[2], &end_tv))) {
498 rrd_set_error( "end time: %s", parsetime_error);
499 return (char *) -1;
500 }
501 if( proc_start_end( &start_tv, &end_tv, &start_tmp, &end_tmp) == -1) {
502 return (char *) -1;
503 }
505 /* Do we do the start or end */
506 if( strcasecmp( args[0], "START") == 0) {
507 the_tm = localtime( &start_tmp);
508 }
509 else if( strcasecmp( args[0], "END") == 0) {
510 the_tm = localtime( &end_tmp);
511 }
512 else {
513 rrd_set_error( "start/end not found in '%s'", args[0]);
514 return (char *) -1;
515 }
517 /* now format it */
518 if( strftime( formatted, MAX_STRFTIME_SIZE, args[3], the_tm)) {
519 return( stralloc( formatted));
520 }
521 else {
522 rrd_set_error( "strftime failed");
523 return (char *) -1;
524 }
525 }
527 char* includefile(long argc, char **args){
528 char *buffer;
529 if (argc >= 1) {
530 char* filename = args[0];
531 readfile(filename, &buffer, 0);
532 if (rrd_test_error()) {
533 char *err = malloc((strlen(rrd_get_error())+DS_NAM_SIZE));
534 sprintf(err, "[ERROR: %s]",rrd_get_error());
535 rrd_clear_error();
536 return err;
537 } else {
538 return buffer;
539 }
540 }
541 else
542 {
543 return stralloc("[ERROR: No Inclue file defined]");
544 }
545 }
547 /* make a copy of buf and replace open/close brackets with '_' */
548 char* rrdstrip(char *buf) {
549 char* p;
550 if (buf == NULL) {
551 return NULL;
552 }
553 /* make a copy of the buffer */
554 buf = stralloc(buf);
555 if (buf == NULL) {
556 return NULL;
557 }
559 p = buf;
560 while (*p) {
561 if (*p == '<' || *p == '>') {
562 *p = '_';
563 }
564 p++;
565 }
566 return buf;
567 }
569 char* cgigetq(long argc, char **args){
570 if (argc>= 1){
571 char *buf = rrdstrip(cgiGetValue(cgiArg,args[0]));
572 char *buf2;
573 char *c,*d;
574 int qc=0;
575 if (buf==NULL) return NULL;
577 for(c=buf;*c != '\0';c++)
578 if (*c == '"') qc++;
579 if ((buf2 = malloc((strlen(buf) + 4 * qc + 4))) == NULL) {
580 perror("Malloc Buffer");
581 exit(1);
582 };
583 c=buf;
584 d=buf2;
585 *(d++) = '"';
586 while(*c != '\0'){
587 if (*c == '"') {
588 *(d++) = '"';
589 *(d++) = '\'';
590 *(d++) = '"';
591 *(d++) = '\'';
592 }
593 *(d++) = *(c++);
594 }
595 *(d++) = '"';
596 *(d) = '\0';
597 free(buf);
598 return buf2;
599 }
601 return stralloc("[ERROR: not enough argument for RRD::CV::QUOTE]");
602 }
604 /* remove occurrences of .. this is a general measure to make
605 paths which came in via cgi do not go UP ... */
607 char* cgigetqp(long argc, char **args){
608 if (argc>= 1) {
609 char *buf = rrdstrip(cgiGetValue(cgiArg,args[0]));
610 char *buf2;
611 char *c,*d;
612 int qc=0;
614 if (buf==NULL)
615 return NULL;
617 for(c=buf;*c != '\0';c++) {
618 if (*c == '"') {
619 qc++;
620 }
621 }
623 if ((buf2 = malloc((strlen(buf) + 4 * qc + 4))) == NULL) {
624 perror("Malloc Buffer");
625 exit(1);
626 };
628 c=buf;
629 d=buf2;
631 *(d++) = '"';
632 while (*c != '\0') {
633 if (*c == '"') {
634 *(d++) = '"';
635 *(d++) = '\'';
636 *(d++) = '"';
637 *(d++) = '\'';
638 }
639 if(*c == '/') {
640 *(d++) = '_';
641 c++;
642 } else {
643 if (*c=='.' && *(c+1) == '.') {
644 c += 2;
645 *(d++) = '_'; *(d++) ='_';
646 } else {
647 *(d++) = *(c++);
648 }
649 }
650 }
651 *(d++) = '"';
652 *(d) = '\0';
653 free(buf);
654 return buf2;
655 }
656 return stralloc("[ERROR: not enough arguments for RRD::CV::PATH]");
657 }
660 char* cgiget(long argc, char **args){
661 if (argc>= 1)
662 return rrdstrip(cgiGetValue(cgiArg,args[0]));
663 else
664 return stralloc("[ERROR: not enough arguments for RRD::CV]");
665 }
669 char* drawgraph(long argc, char **args){
670 int i,xsize, ysize;
671 for(i=0;i<argc;i++)
672 if(strcmp(args[i],"--imginfo")==0 || strcmp(args[i],"-g")==0) break;
673 if(i==argc) {
674 args[argc++] = "--imginfo";
675 args[argc++] = "<IMG SRC=\"./%s\" WIDTH=\"%lu\" HEIGHT=\"%lu\">";
676 }
677 optind=0; /* reset gnu getopt */
678 opterr=0; /* reset gnu getopt */
679 calfree();
680 if( rrd_graph(argc+1, args-1, &calcpr, &xsize, &ysize,NULL) != -1 ) {
681 return stralloc(calcpr[0]);
682 } else {
683 if (rrd_test_error()) {
684 char *err = malloc((strlen(rrd_get_error())+DS_NAM_SIZE)*sizeof(char));
685 sprintf(err, "[ERROR: %s]",rrd_get_error());
686 rrd_clear_error();
687 calfree();
688 return err;
689 }
690 }
691 return NULL;
692 }
694 char* drawprint(long argc, char **args){
695 if (argc==1 && calcpr){
696 long i=0;
697 while (calcpr[i] != NULL) i++; /*determine number lines in calcpr*/
698 if (atol(args[0])<i-1)
699 return stralloc(calcpr[atol(args[0])+1]);
700 }
701 return stralloc("[ERROR: RRD::PRINT argument error]");
702 }
704 char* printtimelast(long argc, char **args) {
705 time_t last;
706 struct tm tm_last;
707 char *buf;
708 if ( argc == 2 ) {
709 buf = malloc(255);
710 if (buf == NULL){
711 return stralloc("[ERROR: allocating strftime buffer]");
712 };
713 last = rrd_last(argc+1, args-1);
714 if (rrd_test_error()) {
715 char *err = malloc((strlen(rrd_get_error())+DS_NAM_SIZE)*sizeof(char));
716 sprintf(err, "[ERROR: %s]",rrd_get_error());
717 rrd_clear_error();
718 return err;
719 }
720 tm_last = *localtime(&last);
721 strftime(buf,254,args[1],&tm_last);
722 return buf;
723 }
724 if ( argc < 2 ) {
725 return stralloc("[ERROR: too few arguments for RRD::TIME::LAST]");
726 }
727 return stralloc("[ERROR: not enough arguments for RRD::TIME::LAST]");
728 }
730 char* printtimenow(long argc, char **args) {
731 time_t now = time(NULL);
732 struct tm tm_now;
733 char *buf;
734 if ( argc == 1 ) {
735 buf = malloc(255);
736 if (buf == NULL){
737 return stralloc("[ERROR: allocating strftime buffer]");
738 };
739 tm_now = *localtime(&now);
740 strftime(buf,254,args[0],&tm_now);
741 return buf;
742 }
743 if ( argc < 1 ) {
744 return stralloc("[ERROR: too few arguments for RRD::TIME::NOW]");
745 }
746 return stralloc("[ERROR: not enough arguments for RRD::TIME::NOW]");
747 }
749 /* Scan buffer until an unescaped '>' arives.
750 * Update argument array with arguments found.
751 * Return end cursor where parsing stopped, or NULL in case of failure.
752 *
753 * FIXME:
754 * To allow nested constructs, we call rrd_expand_vars() for arguments
755 * that contain RRD::x directives. These introduce a small memory leak
756 * since we have to stralloc the arguments the way parse() works.
757 */
758 char*
759 scanargs(char *line, int *argument_count, char ***arguments)
760 {
761 char *getP; /* read cursor */
762 char *putP; /* write cursor */
763 char Quote; /* type of quote if in quoted string, 0 otherwise */
764 int tagcount; /* open tag count */
765 int in_arg; /* if we currently are parsing an argument or not */
766 int argsz; /* argument array size */
767 int curarg_contains_rrd_directives;
769 /* local array of arguments while parsing */
770 int argc = 0;
771 char** argv;
773 #ifdef DEBUG_PARSER
774 printf("<-- scanargs(%s) -->\n", line);
775 #endif
777 *arguments = NULL;
778 *argument_count = 0;
780 /* create initial argument array of char pointers */
781 argsz = 32;
782 argv = (char **)malloc(argsz * sizeof(char *));
783 if (!argv) {
784 return NULL;
785 }
787 /* skip leading blanks */
788 while (isspace((int)*line)) {
789 line++;
790 }
792 getP = line;
793 putP = line;
795 Quote = 0;
796 in_arg = 0;
797 tagcount = 0;
799 curarg_contains_rrd_directives = 0;
801 /* start parsing 'line' for arguments */
802 while (*getP)
803 {
804 unsigned char c = *getP++;
806 if (c == '>' && !Quote && !tagcount) {
807 /* this is our closing tag, quit scanning */
808 break;
809 }
811 /* remove all special chars */
812 if (c < ' ') {
813 c = ' ';
814 }
816 switch (c)
817 {
818 case ' ':
819 if (Quote || tagcount) {
820 /* copy quoted/tagged string */
821 *putP++ = c;
822 }
823 else if (in_arg)
824 {
825 /* end argument string */
826 *putP++ = 0;
827 in_arg = 0;
828 if (curarg_contains_rrd_directives) {
829 argv[argc-1] = rrd_expand_vars(stralloc(argv[argc-1]));
830 curarg_contains_rrd_directives = 0;
831 }
832 }
833 break;
835 case '"': /* Fall through */
836 case '\'':
837 if (Quote != 0) {
838 if (Quote == c) {
839 Quote = 0;
840 } else {
841 /* copy quoted string */
842 *putP++ = c;
843 }
844 } else {
845 if (!in_arg) {
846 /* reference argument string in argument array */
847 argv[argc++] = putP;
848 in_arg=1;
849 }
850 Quote = c;
851 }
852 break;
854 default:
855 if (!Quote) {
856 if (!in_arg) {
857 /* start new argument */
858 argv[argc++] = putP;
859 in_arg = 1;
860 }
861 if (c == '>') {
862 if (tagcount) {
863 tagcount--;
864 }
865 }
866 if (c == '<') {
867 tagcount++;
868 if (0 == strncmp(getP, "RRD::", strlen("RRD::"))) {
869 curarg_contains_rrd_directives = 1;
870 }
871 }
872 }
873 *putP++ = c;
874 break;
875 }
877 /* check if our argument array is still large enough */
878 if (argc == argsz) {
879 /* resize argument array */
880 argsz *= 2;
881 argv = rrd_realloc(argv, argsz * sizeof(char *));
882 if (*argv == NULL) {
883 return NULL;
884 }
885 }
886 }
888 /* terminate last argument found */
889 *putP = '\0';
890 if (curarg_contains_rrd_directives) {
891 argv[argc-1] = rrd_expand_vars(stralloc(argv[argc-1]));
892 }
894 #ifdef DEBUG_PARSER
895 if (argc > 0) {
896 int n;
897 printf("<-- arguments found [%d]\n", argc);
898 for (n=0; n<argc; n++) {
899 printf("arg %02d: '%s'\n", n, argv[n]);
900 }
901 printf("-->\n");
902 } else {
903 printf("<!-- No arguments found -->\n");
904 }
905 #endif
907 /* update caller's notion of the argument array and it's size */
908 *arguments = argv;
909 *argument_count = argc;
911 if (Quote) {
912 return NULL;
913 }
915 /* Return new scanning cursor:
916 pointer to char after closing bracket */
917 return getP;
918 }
921 /*
922 * Parse(): scan current portion of buffer for given tag.
923 * If found, parse tag arguments and call 'func' for it.
924 * The result of func is inserted at the current position
925 * in the buffer.
926 */
927 int
928 parse(
929 char **buf, /* buffer */
930 long i, /* offset in buffer */
931 char *tag, /* tag to handle */
932 char *(*func)(long argc, char **args) /* function to call for 'tag' */
933 )
934 {
935 /* the name of the vairable ... */
936 char *val;
937 long valln;
938 char **args;
939 char *end;
940 long end_offset;
941 int argc;
942 size_t taglen = strlen(tag);
944 /* Current position in buffer should start with 'tag' */
945 if (strncmp((*buf)+i, tag, taglen) != 0) {
946 return 0;
947 }
948 /* .. and match exactly (a whitespace following 'tag') */
949 if (! isspace(*((*buf) + i + taglen)) ) {
950 return 0;
951 }
953 #ifdef DEBUG_PARSER
954 printf("parse(): handeling tag '%s'\n", tag);
955 #endif
957 /* Scan for arguments following the tag;
958 scanargs() puts \0 into *buf ... so after scanargs it is probably
959 not a good time to use strlen on buf */
960 end = scanargs((*buf) + i + taglen, &argc, &args);
961 if (end)
962 {
963 /* got arguments, call function for 'tag' with arguments */
964 val = func(argc, args);
965 free(args);
966 }
967 else
968 {
969 /* unable to parse arguments, undo 0-termination by scanargs */
970 for (; argc > 0; argc--) {
971 *((args[argc-1])-1) = ' ';
972 }
974 /* next call, try parsing at current offset +1 */
975 end = (*buf) + i + 1;
977 val = stralloc("[ERROR: Parsing Problem with the following text\n"
978 " Check original file. This may have been altered "
979 "by parsing.]\n\n");
980 }
982 /* remember offset where we have to continue parsing */
983 end_offset = end - (*buf);
985 valln = 0;
986 if (val) {
987 valln = strlen(val);
988 }
990 /* Optionally resize buffer to hold the replacement value:
991 Calculating the new length of the buffer is simple. add current
992 buffer pos (i) to length of string after replaced tag to length
993 of replacement string and add 1 for the final zero ... */
994 if (end - (*buf) < (i + valln)) {
995 /* make sure we do not shrink the mallocd block */
996 size_t newbufsize = i + strlen(end) + valln + 1;
997 *buf = rrd_realloc(*buf, newbufsize);
999 if (*buf == NULL) {
1000 perror("Realoc buf:");
1001 exit(1);
1002 };
1003 }
1005 /* Update new end pointer:
1006 make sure the 'end' pointer gets moved along with the
1007 buf pointer when realloc moves memory ... */
1008 end = (*buf) + end_offset;
1010 /* splice the variable:
1011 step 1. Shift pending data to make room for 'val' */
1012 memmove((*buf) + i + valln, end, strlen(end) + 1);
1014 /* step 2. Insert val */
1015 if (val) {
1016 memmove((*buf)+i, val, valln);
1017 free(val);
1018 }
1019 return (valln > 0 ? valln-1: valln);
1020 }
1022 char *
1023 http_time(time_t *now) {
1024 struct tm *tmptime;
1025 static char buf[60];
1027 tmptime=gmtime(now);
1028 strftime(buf,sizeof(buf),"%a, %d %b %Y %H:%M:%S GMT",tmptime);
1029 return(buf);
1030 }