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Check output value of tor_inet_ntop/tor_inet_ntoa in dns.c

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This commit is contained in:
rl1987 2020-04-08 18:07:14 +03:00 committed by rl1987
parent ca13249dcc
commit b5bfdbfd41
1 changed files with 18 additions and 6 deletions
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24
src/feature/relay/dns.c
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@ -1591,12 +1591,17 @@ evdns_callback(int result, char type, int count, int ttl, void *addresses,
} else if (type == DNS_IPv6_AAAA && count) {
char answer_buf[TOR_ADDR_BUF_LEN];
char *escaped_address;
const char *ip_str;
struct in6_addr *addrs = addresses;
tor_addr_from_in6(&addr, &addrs[0]);
tor_inet_ntop(AF_INET6, &addrs[0], answer_buf, sizeof(answer_buf));
ip_str = tor_inet_ntop(AF_INET6, &addrs[0], answer_buf,
sizeof(answer_buf));
escaped_address = esc_for_log(string_address);
if (answer_is_wildcarded(answer_buf)) {
if (BUG(ip_str == NULL)) {
log_warn(LD_EXIT, "tor_inet_ntop() failed!");
result = DNS_ERR_NOTEXIST;
} else if (answer_is_wildcarded(answer_buf)) {
log_debug(LD_EXIT, "eventdns said that %s resolves to ISP-hijacked "
"address %s; treating as a failure.",
safe_str(escaped_address),
@ -1863,6 +1868,7 @@ evdns_wildcard_check_callback(int result, char type, int count, int ttl,
void *addresses, void *arg)
{
(void)ttl;
const char *ip_str;
++n_wildcard_requests;
if (result == DNS_ERR_NONE && count) {
char *string_address = arg;
@ -1872,16 +1878,22 @@ evdns_wildcard_check_callback(int result, char type, int count, int ttl,
for (i = 0; i < count; ++i) {
char answer_buf[INET_NTOA_BUF_LEN+1];
struct in_addr in;
int ntoa_res;
in.s_addr = addrs[i];
tor_inet_ntoa(&in, answer_buf, sizeof(answer_buf));
wildcard_increment_answer(answer_buf);
ntoa_res = tor_inet_ntoa(&in, answer_buf, sizeof(answer_buf));
tor_assert_nonfatal(ntoa_res > 0);
if (ntoa_res > 0)
wildcard_increment_answer(answer_buf);
}
} else if (type == DNS_IPv6_AAAA) {
const struct in6_addr *addrs = addresses;
for (i = 0; i < count; ++i) {
char answer_buf[TOR_ADDR_BUF_LEN+1];
tor_inet_ntop(AF_INET6, &addrs[i], answer_buf, sizeof(answer_buf));
wildcard_increment_answer(answer_buf);
ip_str = tor_inet_ntop(AF_INET6, &addrs[i], answer_buf,
sizeof(answer_buf));
tor_assert_nonfatal(ip_str);
if (ip_str)
wildcard_increment_answer(answer_buf);
}
}