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3707. [bug] irs_resconf_load now returns ISC_R_FILENOTFOUND

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on a missing resolv.conf file and initializes the
                        structure as if it had been configured with:

                                nameserver ::1
                                nameserver 127.0.0.1

                        Note: Callers will need to be updated to treat
                        ISC_R_FILENOTFOUND as a qualified success or else
                        they will leak memory. The following code fragment
                        will work with both only and new versions without
                        changing the behaviour of the existing code.

                        resconf = NULL;
                        result = irs_resconf_load(mctx, "/etc/resolv.conf",
                                                  &resconf);
                        if (result != ISC_SUCCESS) {
                                if (resconf != NULL)
                                        irs_resconf_destroy(&resconf);
                                ....
                        }

                        [RT #35194]
This commit is contained in:
Mark Andrews 2014-01-15 15:22:55 +11:00
parent 7edf48213c
commit cd7f8d18f8
4 changed files with 80 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
CHANGES
View File

@ -1,3 +1,27 @@
3707. [bug] irs_resconf_load now returns ISC_R_FILENOTFOUND
on a missing resolv.conf file and initializes the
structure as if it had been configured with:
nameserver ::1
nameserver 127.0.0.1
Note: Callers will need to be updated to treat
ISC_R_FILENOTFOUND as a qualified success or else
they will leak memory. The following code fragment
will work with both only and new versions without
changing the behaviour of the existing code.
resconf = NULL;
result = irs_resconf_load(mctx, "/etc/resolv.conf",
&resconf);
if (result != ISC_SUCCESS) {
if (resconf != NULL)
irs_resconf_destroy(&resconf);
....
}
[RT #35194]
3706. [contrib] queryperf: Fixed a possible integer overflow when
printing results. [RT #35182]

12
lib/irs/include/irs/resconf.h
View File

@ -46,7 +46,12 @@ isc_result_t
irs_resconf_load(isc_mem_t *mctx, const char *filename, irs_resconf_t **confp);
/*%<
* Load the resolver configuration file 'filename' in the "resolv.conf" format,
* and create a new irs_resconf_t object from the configuration.
* and create a new irs_resconf_t object from the configuration. If the file
* is not found ISC_R_FILENOTFOUND is returned with the structure initialized
* as if file contained only:
*
* nameserver ::1
* nameserver 127.0.0.1
*
* Notes:
*
@ -55,6 +60,11 @@ irs_resconf_load(isc_mem_t *mctx, const char *filename, irs_resconf_t **confp);
* In addition, 'sortlist' is not actually effective; it's parsed, but
* the application cannot use the configuration.
*
* Returns:
* \li ISC_R_SUCCESS on success
* \li ISC_R_FILENOTFOUND if the file was not found. *confp will be valid.
* \li other on error.
*
* Requires:
*
*\li 'mctx' is a valid memory context.

80
lib/irs/resconf.c
View File

@ -507,45 +507,50 @@ irs_resconf_load(isc_mem_t *mctx, const char *filename, irs_resconf_t **confp)
conf->search[i] = NULL;
errno = 0;
if ((fp = fopen(filename, "r")) == NULL) {
isc_mem_put(mctx, conf, sizeof(*conf));
return (ISC_R_INVALIDFILE);
}
ret = ISC_R_SUCCESS;
do {
stopchar = getword(fp, word, sizeof(word));
if (stopchar == EOF) {
rval = ISC_R_SUCCESS;
POST(rval);
break;
}
if (strlen(word) == 0U)
rval = ISC_R_SUCCESS;
else if (strcmp(word, "nameserver") == 0)
rval = resconf_parsenameserver(conf, fp);
else if (strcmp(word, "domain") == 0)
rval = resconf_parsedomain(conf, fp);
else if (strcmp(word, "search") == 0)
rval = resconf_parsesearch(conf, fp);
else if (strcmp(word, "sortlist") == 0)
rval = resconf_parsesortlist(conf, fp);
else if (strcmp(word, "options") == 0)
rval = resconf_parseoption(conf, fp);
else {
/* unrecognised word. Ignore entire line */
rval = ISC_R_SUCCESS;
stopchar = eatline(fp);
if ((fp = fopen(filename, "r")) != NULL) {
ret = ISC_R_SUCCESS;
do {
stopchar = getword(fp, word, sizeof(word));
if (stopchar == EOF) {
rval = ISC_R_SUCCESS;
POST(rval);
break;
}
}
if (ret == ISC_R_SUCCESS && rval != ISC_R_SUCCESS)
ret = rval;
} while (1);
fclose(fp);
if (strlen(word) == 0U)
rval = ISC_R_SUCCESS;
else if (strcmp(word, "nameserver") == 0)
rval = resconf_parsenameserver(conf, fp);
else if (strcmp(word, "domain") == 0)
rval = resconf_parsedomain(conf, fp);
else if (strcmp(word, "search") == 0)
rval = resconf_parsesearch(conf, fp);
else if (strcmp(word, "sortlist") == 0)
rval = resconf_parsesortlist(conf, fp);
else if (strcmp(word, "options") == 0)
rval = resconf_parseoption(conf, fp);
else {
/* unrecognised word. Ignore entire line */
rval = ISC_R_SUCCESS;
stopchar = eatline(fp);
if (stopchar == EOF) {
break;
}
}
if (ret == ISC_R_SUCCESS && rval != ISC_R_SUCCESS)
ret = rval;
} while (1);
fclose(fp);
} else {
switch (errno) {
case ENOENT:
break;
default:
isc_mem_put(mctx, conf, sizeof(*conf));
return (ISC_R_INVALIDFILE);
}
}
/* If we don't find a nameserver fall back to localhost */
if (conf->numns == 0) {
@ -575,8 +580,11 @@ irs_resconf_load(isc_mem_t *mctx, const char *filename, irs_resconf_t **confp)
if (ret != ISC_R_SUCCESS)
irs_resconf_destroy(&conf);
else
else {
if (fp == NULL)
ret = ISC_R_FILENOTFOUND;
*confp = conf;
}
return (ret);
}

2
lib/samples/resolve.c
View File

@ -401,7 +401,7 @@ main(int argc, char *argv[]) {
isc_sockaddrlist_t *nameservers;
result = irs_resconf_load(mctx, "/etc/resolv.conf", &resconf);
if (result != ISC_R_SUCCESS) {
if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) {
fprintf(stderr, "irs_resconf_load failed: %d\n",
result);
exit(1);