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Error out if gen finds a type or class that is greater than 65535

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This commit is contained in:
Mark Andrews 2020-01-15 13:54:05 +11:00
parent 5f3ff44914
commit d3d22502b4
1 changed files with 32 additions and 16 deletions
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48
lib/dns/gen.c
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@ -127,7 +127,7 @@ static const char copyright[] = "/*\n"
#define TYPENAMES 256
#define TYPECLASSLEN 20 /* DNS mnemonic size. Must be less than 100. */
#define TYPECLASSBUF (TYPECLASSLEN + 1)
#define TYPECLASSFMT "%" STR(TYPECLASSLEN) "[-0-9a-z]_%d"
#define TYPECLASSFMT "%" STR(TYPECLASSLEN) "[-0-9a-z]_%u"
#define ATTRIBUTESIZE 256
static struct cc {
@ -163,9 +163,9 @@ static void
doswitch(const char *, const char *, const char *, const char *, const char *,
const char *);
static void
add(int, const char *, int, const char *, const char *);
add(unsigned int, const char *, int, const char *, const char *);
static void
sd(int, const char *, const char *, char);
sd(unsigned int, const char *, const char *, char);
static void
insert_into_typenames(int, const char *, const char *);
@ -370,7 +370,7 @@ insert_into_typenames(int type, const char *typebuf, const char *attr) {
}
static void
add(int rdclass, const char *classbuf, int type, const char *typebuf,
add(unsigned int rdclass, const char *classbuf, int type, const char *typebuf,
const char *dirbuf) {
struct tt *newtt = (struct tt *)malloc(sizeof(*newtt));
struct tt *tt, *oldtt;
@ -468,10 +468,12 @@ add(int rdclass, const char *classbuf, int type, const char *typebuf,
}
static void
sd(int rdclass, const char *classbuf, const char *dirbuf, char filetype) {
char buf[TYPECLASSLEN + sizeof("_65535.h")];
sd(unsigned int rdclass, const char *classbuf, const char *dirbuf,
char filetype) {
char buf[TYPECLASSLEN + sizeof("_4294967295.h")];
char typebuf[TYPECLASSBUF];
int type, n;
unsigned int type;
int n;
isc_dir_t dir;
if (!start_directory(dirbuf, &dir)) {
@ -482,16 +484,23 @@ sd(int rdclass, const char *classbuf, const char *dirbuf, char filetype) {
if (sscanf(dir.filename, TYPECLASSFMT, typebuf, &type) != 2) {
continue;
}
if ((type > 65535) || (type < 0)) {
continue;
}
n = snprintf(buf, sizeof(buf), "%s_%d.%c", typebuf, type,
/*
* sscanf accepts leading sign and zeros before type so
* compare the scanned items against the filename. Filter
* out mismatches. Also filter out bad file extensions.
*/
n = snprintf(buf, sizeof(buf), "%s_%u.%c", typebuf, type,
filetype);
INSIST(n > 0 && (unsigned)n < sizeof(buf));
if (strcmp(buf, dir.filename) != 0) {
continue;
}
if (type > 65535) {
fprintf(stderr, "Error: type value > 65535 (%s)\n",
dir.filename);
exit(1);
}
add(rdclass, classbuf, type, typebuf, dirbuf);
}
@ -518,7 +527,7 @@ int
main(int argc, char **argv) {
char buf[PATH_MAX];
char srcdir[PATH_MAX];
int rdclass;
unsigned int rdclass;
char classbuf[TYPECLASSBUF];
struct tt *tt;
struct cc *cc;
@ -622,16 +631,23 @@ main(int argc, char **argv) {
{
continue;
}
if ((rdclass > 65535) || (rdclass < 0)) {
continue;
}
n = snprintf(buf, sizeof(buf), "%srdata/%s_%d", srcdir,
/*
* sscanf accepts leading sign and zeros before type so
* compare the scanned items against the filename. Filter
* out mismatches.
*/
n = snprintf(buf, sizeof(buf), "%srdata/%s_%u", srcdir,
classbuf, rdclass);
INSIST(n > 0 && (unsigned)n < sizeof(buf));
if (strcmp(buf + 6 + strlen(srcdir), dir.filename) != 0) {
continue;
}
if (rdclass > 65535) {
fprintf(stderr, "Error: class value > 65535 (%s)\n",
dir.filename);
exit(1);
}
sd(rdclass, classbuf, buf, filetype);
}
end_directory(&dir);