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Diffstat (limited to 'resolv/inet_net_pton.c')
-rw-r--r--resolv/inet_net_pton.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/resolv/inet_net_pton.c b/resolv/inet_net_pton.c
index 7c863492d7..bf6fe02ed8 100644
--- a/resolv/inet_net_pton.c
+++ b/resolv/inet_net_pton.c
@@ -97,9 +97,7 @@ inet_net_pton_ipv4(src, dst, size)
int n, ch, tmp, dirty, bits;
const u_char *odst = dst;
- bits = -1;
ch = *src++;
-
if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
&& isascii(src[1]) && isxdigit(src[1])) {
/* Hexadecimal: Eat nybble string. */
@@ -150,6 +148,7 @@ inet_net_pton_ipv4(src, dst, size)
} else
goto enoent;
+ bits = -1;
if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
/* CIDR width specifier. Nothing can follow it. */
ch = *src++; /* Skip over the /. */
@@ -163,6 +162,8 @@ inet_net_pton_ipv4(src, dst, size)
isascii(ch) && isdigit(ch));
if (ch != '\0')
goto enoent;
+ if (bits > 32)
+ goto emsgsize;
}
/* Firey death and destruction unless we prefetched EOS. */
@@ -174,14 +175,19 @@ inet_net_pton_ipv4(src, dst, size)
goto enoent;
/* If no CIDR spec was given, infer width from net class. */
if (bits == -1) {
- if (*odst >= 224)
+ if (*odst >= 240) /* Class E */
+ bits = 32;
+ else if (*odst >= 224) /* Class D */
bits = 4;
- else if (*odst >= 192)
+ else if (*odst >= 192) /* Class C */
bits = 24;
- else if (*odst >= 128)
+ else if (*odst >= 128) /* Class B */
bits = 16;
- else
+ else /* Class A */
bits = 8;
+ /* If imputed mask is narrower than specified octets, widen. */
+ if (bits >= 8 && bits < ((dst - odst) * 8))
+ bits = (dst - odst) * 8;
}
/* Extend network to cover the actual mask. */
while (bits > ((dst - odst) * 8)) {