2 * a generic (simple) parser. Use to parse rr's, private key
3 * information and /etc/resolv.conf files
5 * a Net::DNS like library for C
6 * LibDNS Team @ NLnet Labs
7 * (c) NLnet Labs, 2005-2006
8 * See the file LICENSE for the license
11 #include "sldns/parse.h"
12 #include "sldns/parseutil.h"
13 #include "sldns/sbuffer.h"
18 sldns_lookup_table sldns_directive_types[] = {
19 { LDNS_DIR_TTL, "$TTL" },
20 { LDNS_DIR_ORIGIN, "$ORIGIN" },
21 { LDNS_DIR_INCLUDE, "$INCLUDE" },
25 /* add max_limit here? */
27 sldns_fget_token(FILE *f, char *token, const char *delim, size_t limit)
29 return sldns_fget_token_l(f, token, delim, limit, NULL);
33 sldns_fget_token_l(FILE *f, char *token, const char *delim, size_t limit, int *line_nr)
36 int p; /* 0 -> no parentheses seen, >0 nr of ( seen */
43 /* standard delimiters */
46 del = LDNS_PARSE_NORMAL;
60 while ((c = getc(f)) != EOF) {
61 if (c == '\r') /* carriage return */
63 if (c == '(' && prev_c != '\\' && !quoted) {
64 /* this only counts for non-comments */
72 if (c == ')' && prev_c != '\\' && !quoted) {
73 /* this only counts for non-comments */
82 /* more ) then ( - close off the string */
87 /* do something with comments ; */
88 if (c == ';' && quoted == 0) {
93 if (c == '\"' && com == 0 && prev_c != '\\') {
97 if (c == '\n' && com != 0) {
102 *line_nr = *line_nr + 1;
104 if (p == 0 && i > 0) {
118 if (c == '\n' && p != 0 && t > token) {
121 *line_nr = *line_nr + 1;
123 if (limit > 0 && (i >= limit || (size_t)(t-token) >= limit)) {
132 /* check if we hit the delim */
133 for (d = del; *d; d++) {
134 if (c == *d && i > 0 && prev_c != '\\' && p == 0) {
135 if (c == '\n' && line_nr) {
136 *line_nr = *line_nr + 1;
141 if (c != '\0' && c != '\n') {
144 if (limit > 0 && (i >= limit || (size_t)(t-token) >= limit)) {
148 if (c != '\0' && c != '\n') {
151 if (c == '\\' && prev_c == '\\')
171 /* do not skip over quotes after the string, they are part
172 * of the next string. But skip over whitespace (if needed)*/
173 sldns_fskipcs_l(f, del+1, line_nr);
174 else sldns_fskipcs_l(f, del, line_nr);
184 sldns_fget_keyword_data(FILE *f, const char *keyword, const char *k_del, char *data,
185 const char *d_del, size_t data_limit)
187 return sldns_fget_keyword_data_l(f, keyword, k_del, data, d_del,
192 sldns_fget_keyword_data_l(FILE *f, const char *keyword, const char *k_del, char *data,
193 const char *d_del, size_t data_limit, int *line_nr)
195 /* we assume: keyword|sep|data */
199 if(strlen(keyword) >= LDNS_MAX_KEYWORDLEN)
201 fkeyword = (char*)malloc(LDNS_MAX_KEYWORDLEN);
205 i = sldns_fget_token(f, fkeyword, k_del, LDNS_MAX_KEYWORDLEN);
211 /* case??? i instead of strlen? */
212 if (strncmp(fkeyword, keyword, LDNS_MAX_KEYWORDLEN - 1) == 0) {
214 /* printf("%s\n%s\n", "Matching keyword", fkeyword); */
215 i = sldns_fget_token_l(f, data, d_del, data_limit, line_nr);
219 /*printf("no match for %s (read: %s)\n", keyword, fkeyword);*/
226 sldns_bgetc(sldns_buffer *buffer)
228 if (!sldns_buffer_available_at(buffer, buffer->_position, sizeof(uint8_t))) {
229 sldns_buffer_set_position(buffer, sldns_buffer_limit(buffer));
230 /* sldns_buffer_rewind(buffer);*/
233 return (int)sldns_buffer_read_u8(buffer);
237 sldns_bget_token(sldns_buffer *b, char *token, const char *delim, size_t limit)
239 return sldns_bget_token_par(b, token, delim, limit, NULL, NULL);
243 sldns_bget_token_par(sldns_buffer *b, char *token, const char *delim,
244 size_t limit, int* par, const char* skipw)
247 int p; /* 0 -> no parentheses seen, >0 nr of ( seen */
254 /* standard delimiters */
256 /* from isspace(3) */
257 del = LDNS_PARSE_NORMAL;
272 while ((c = sldns_bgetc(b)) != EOF) {
273 if (c == '\r') /* carriage return */
275 if (c == '(' && lc != '\\' && !quoted) {
276 /* this only counts for non-comments */
285 if (c == ')' && lc != '\\' && !quoted) {
286 /* this only counts for non-comments */
301 /* do something with comments ; */
302 if (c == ';' && quoted == 0) {
307 if (c == '"' && com == 0 && lc != '\\') {
311 if (c == '\n' && com != 0) {
325 if (c == '\n' && p != 0) {
327 /* do not write ' ' if we want to skip spaces */
328 if(!(skipw && (strchr(skipw, c)||strchr(skipw, ' '))))
334 /* check to skip whitespace at start, but also after ( */
335 if(skipw && i==0 && !com && !quoted && lc != '\\') {
336 if(strchr(skipw, c)) {
342 /* check if we hit the delim */
343 for (d = del; *d; d++) {
344 /* we can only exit if no parens or user tracks them */
345 if (c == *d && lc != '\\' && (p == 0 || par)) {
351 if (limit > 0 && (i >= limit || (size_t)(t-token) >= limit)) {
357 if (c == '\\' && lc == '\\') {
368 if (!par && p != 0) {
375 /* do not skip over quotes after the string, they are part
376 * of the next string. But skip over whitespace (if needed)*/
377 sldns_bskipcs(b, del+1);
378 else sldns_bskipcs(b, del);
381 if (!par && p != 0) {
389 sldns_bskipcs(sldns_buffer *buffer, const char *s)
395 while(sldns_buffer_available_at(buffer, buffer->_position, sizeof(char))) {
396 c = (char) sldns_buffer_read_u8_at(buffer, buffer->_position);
398 for (d = s; *d; d++) {
403 if (found && buffer->_limit > buffer->_position) {
404 buffer->_position += sizeof(char);
412 sldns_fskipcs(FILE *fp, const char *s)
414 sldns_fskipcs_l(fp, s, NULL);
418 sldns_fskipcs_l(FILE *fp, const char *s, int *line_nr)
424 while ((c = fgetc(fp)) != EOF) {
425 if (line_nr && c == '\n') {
426 *line_nr = *line_nr + 1;
429 for (d = s; *d; d++) {
435 /* with getc, we've read too far */
443 sldns_bget_keyword_data(sldns_buffer *b, const char *keyword, const char *k_del, char
444 *data, const char *d_del, size_t data_limit)
446 /* we assume: keyword|sep|data */
450 if(strlen(keyword) >= LDNS_MAX_KEYWORDLEN)
452 fkeyword = (char*)malloc(LDNS_MAX_KEYWORDLEN);
454 return -1; /* out of memory */
456 i = sldns_bget_token(b, fkeyword, k_del, data_limit);
459 return -1; /* nothing read */
463 if (strncmp(fkeyword, keyword, strlen(keyword)) == 0) {
465 /* whee, the match! */
466 /* retrieve it's data */
467 i = sldns_bget_token(b, data, d_del, 0);