From c8cf89a954983b92fe4ea94706cccadfe6a148c0 Mon Sep 17 00:00:00 2001 From: Robert James Kaes Date: Mon, 16 Jun 2008 20:52:40 -0400 Subject: Add strtol conversion error checking Moved the strtol() call into fill_netmask_array() and added additional error checking to ensure that the strtol() call succeeded. Error checking code taken from strtol() manpage. Signed-off-by: Robert James Kaes --- src/acl.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) (limited to 'src') diff --git a/src/acl.c b/src/acl.c index 0d40386..eb200b3 100644 --- a/src/acl.c +++ b/src/acl.c @@ -67,13 +67,26 @@ static vector_t access_list = NULL; * */ inline static int -fill_netmask_array(long int mask, unsigned char array[], unsigned int len) +fill_netmask_array(char *bitmask_string, unsigned char array[], unsigned int len) { unsigned int i; + long int mask; + char *endptr; + + errno = 0; /* to distinguish success/failure after call */ + mask = strtol(bitmask_string, &endptr, 10); + /* check for various conversion errors */ + if ((errno == ERANGE && (mask == LONG_MIN || mask == LONG_MAX)) + || (errno != 0 && mask == 0) + || (endptr == bitmask_string)) + return -1; + + /* valid range for a bit mask */ if (mask < 0 || mask > (8 * len)) return -1; + /* we have a valid range to fill in the array */ for (i = 0; i != len; ++i) { if (mask >= 8) { array[i] = 0xff; @@ -106,7 +119,6 @@ insert_acl(char *location, acl_access_t access_type) { struct acl_s acl; int ret; - long int mask; char *p, ip_dst[IPV6_LEN]; assert(location != NULL); @@ -154,8 +166,7 @@ insert_acl(char *location, acl_access_t access_type) acl.type = ACL_NUMERIC; memcpy(acl.address.ip.octet, ip_dst, IPV6_LEN); - mask = strtol(p + 1, NULL, 10); - if (fill_netmask_array(mask, &(acl.address.ip.mask[0]), IPV6_LEN) < 0) + if (fill_netmask_array(p + 1, &(acl.address.ip.mask[0]), IPV6_LEN) < 0) return -1; } else { /* In all likelihood a string */ -- cgit v1.2.3