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Be stricter about what's a valid IP address in fake_hostent. (Patch from the Google tree.)

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This commit is contained in:
Steinar H. Gunderson 2007-09-29 13:52:14 +00:00
parent 6ecea9453b
commit 9fc66e4dd9
1 changed files with 21 additions and 1 deletions
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22
ares/ares_gethostbyname.c
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@ -209,7 +209,27 @@ static int fake_hostent(const char *name, int family, ares_host_callback callbac
struct in6_addr in6; struct in6_addr in6;
if (family == AF_INET) if (family == AF_INET)
result = ((in.s_addr = inet_addr(name)) == INADDR_NONE ? 0 : 1); {
/* It only looks like an IP address if it's all numbers and dots. */
int numdots = 0;
const char *p;
for (p = name; *p; p++)
{
if (!isdigit(*p) && *p != '.') {
return 0;
} else if (*p == '.') {
numdots++;
}
}
/* if we don't have 3 dots, it is illegal
* (although inet_addr doesn't think so).
*/
if (numdots != 3)
result = 0;
else
result = ((in.s_addr = inet_addr(name)) == INADDR_NONE ? 0 : 1);
}
else if (family == AF_INET6) else if (family == AF_INET6)
result = (ares_inet_pton(AF_INET6, name, &in6) < 1 ? 0 : 1); result = (ares_inet_pton(AF_INET6, name, &in6) < 1 ? 0 : 1);