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ldns: Ignore commented-out lines in resolv.conf.

Browse Source 
This merges upstream PR 238 + an additional bug fix.

PR:		278721
MFC after:	1 week
This commit is contained in:
Dag-Erling Smørgrav 2024-05-15 12:16:24 +02:00
commit 3b092e4936
3 changed files with 42 additions and 48 deletions
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2
contrib/ldns/ldns/parse.h
View File

@ -95,6 +95,8 @@ ssize_t ldns_fget_token_l(FILE *f, char *token, const char *delim, size_t limit,
*/
ldns_status ldns_fget_token_l_st(FILE *f, char **token, size_t *limit, bool fixed, const char *delim, int *line_nr);
ssize_t ldns_fget_token_l_resolv_conf(FILE *f, char *token, const char *delim, size_t limit, int *line_nr);
/**
* returns a token/char from the buffer b.
* This function deals with ( and ) in the buffer,

35
contrib/ldns/parse.c
View File

@ -27,9 +27,14 @@ ldns_fget_token(FILE *f, char *token, const char *delim, size_t limit)
return ldns_fget_token_l(f, token, delim, limit, NULL);
}
ldns_status
ldns_fget_token_l_st(FILE *f, char **token, size_t *limit, bool fixed
, const char *delim, int *line_nr)
enum file_type2parse {
zone_file_type, resolv_conf_file_type
};
static ldns_status
ldns_fget_token_l_st_file_type(FILE *f, char **token, size_t *limit,
bool fixed, const char *delim, int *line_nr,
enum file_type2parse file_type)
{
int c, prev_c;
int p; /* 0 -> no parentheses seen, >0 nr of ( seen */
@ -98,7 +103,9 @@ ldns_fget_token_l_st(FILE *f, char **token, size_t *limit, bool fixed
}
/* do something with comments ; */
if (c == ';' && quoted == 0) {
if ((c == ';'
|| (c == '#' && file_type == resolv_conf_file_type))
&& quoted == 0) {
if (prev_c != '\\') {
com = 1;
}
@ -215,6 +222,26 @@ tokenread:
return i == 0 ? LDNS_STATUS_SYNTAX_EMPTY : LDNS_STATUS_OK;
}
ldns_status
ldns_fget_token_l_st(FILE *f, char **token, size_t *limit, bool fixed
, const char *delim, int *line_nr)
{
return ldns_fget_token_l_st_file_type(
f, token, limit, fixed, delim, line_nr, zone_file_type);
}
ssize_t
ldns_fget_token_l_resolv_conf(FILE *f, char *token, const char *delim,
size_t limit, int *line_nr)
{
if (limit == 0)
limit = LDNS_MAX_LINELEN;
if (ldns_fget_token_l_st_file_type(f, &token, &limit, true, delim,
line_nr, resolv_conf_file_type))
return -1;
else
return (ssize_t)strlen(token);
}
ssize_t
ldns_fget_token_l(FILE *f, char *token, const char *delim, size_t limit, int *line_nr)

53
contrib/ldns/resolver.c
View File

@ -775,7 +775,7 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
#endif
ssize_t gtr, bgtr;
ldns_buffer *b;
int lnr = 0, oldline;
int lnr = 0;
FILE* myfp = fp;
if(!line_nr) line_nr = &lnr;
@ -809,36 +809,18 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
gtr = 1;
word[0] = 0;
oldline = *line_nr;
expect = LDNS_RESOLV_KEYWORD;
while (gtr > 0) {
/* check comments */
if (word[0] == '#') {
word[0]='x';
if(oldline == *line_nr) {
/* skip until end of line */
int c;
do {
c = fgetc(myfp);
} while(c != EOF && c != '\n');
if(c=='\n') (*line_nr)++;
}
/* and read next to prepare for further parsing */
oldline = *line_nr;
continue;
}
oldline = *line_nr;
switch(expect) {
case LDNS_RESOLV_KEYWORD:
/* keyword */
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
if (gtr != 0) {
if(word[0] == '#') continue;
for(i = 0; i < LDNS_RESOLV_KEYWORDS; i++) {
if (strcasecmp(keyword[i], word) == 0) {
/* chosen the keyword and
* expect values carefully
*/
*/
expect = i;
break;
}
@ -856,16 +838,12 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
break;
case LDNS_RESOLV_DEFDOMAIN:
/* default domain dname */
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
if (gtr == 0) {
if(!fp) fclose(myfp);
ldns_resolver_deep_free(r);
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
}
if(word[0] == '#') {
expect = LDNS_RESOLV_KEYWORD;
continue;
}
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, word);
if (!tmp) {
if(!fp) fclose(myfp);
@ -879,16 +857,12 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
break;
case LDNS_RESOLV_NAMESERVER:
/* NS aaaa or a record */
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
if (gtr == 0) {
if(!fp) fclose(myfp);
ldns_resolver_deep_free(r);
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
}
if(word[0] == '#') {
expect = LDNS_RESOLV_KEYWORD;
continue;
}
if(strchr(word, '%')) {
/* snip off interface labels,
* fe80::222:19ff:fe31:4222%eth0 */
@ -911,7 +885,7 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
break;
case LDNS_RESOLV_SEARCH:
/* search list domain dname */
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
b = LDNS_MALLOC(ldns_buffer);
if(!b) {
ldns_resolver_deep_free(r);
@ -929,10 +903,6 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
bgtr = ldns_bget_token(b, word, LDNS_PARSE_NORMAL, (size_t) gtr + 1);
while (bgtr > 0) {
gtr -= bgtr;
if(word[0] == '#') {
expect = LDNS_RESOLV_KEYWORD;
break;
}
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, word);
if (!tmp) {
ldns_resolver_deep_free(r);
@ -954,28 +924,23 @@ ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
}
break;
case LDNS_RESOLV_SORTLIST:
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
/* sortlist not implemented atm */
expect = LDNS_RESOLV_KEYWORD;
break;
case LDNS_RESOLV_OPTIONS:
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
/* options not implemented atm */
expect = LDNS_RESOLV_KEYWORD;
break;
case LDNS_RESOLV_ANCHOR:
/* a file containing a DNSSEC trust anchor */
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
gtr = ldns_fget_token_l_resolv_conf(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
if (gtr == 0) {
ldns_resolver_deep_free(r);
if(!fp) fclose(myfp);
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
}
if(word[0] == '#') {
expect = LDNS_RESOLV_KEYWORD;
continue;
}
#ifdef HAVE_SSL
tmp_rr = ldns_read_anchor_file(word);
(void) ldns_resolver_push_dnssec_anchor(r, tmp_rr);