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Fix remote_ip not set in UDP recvfrom #21

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Merged
philljj merged 5 commits into from
Feb 9, 2026
Merged

Fix remote_ip not set in UDP recvfrom #21

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3f3cceb
UT to confirm remote_ip not being set in UDP recvfrom
danielinux Feb 9, 2026
51f67b1
Fix: setting ts->remote_ip in wolf_sock_recvfrom()
danielinux Feb 9, 2026
19a244b
wolfIP_sock_recvfrom: added more corner-cases UT
danielinux Feb 9, 2026
5abd3a8
Implemented hardening against spoofed local-ip packets
danielinux Feb 9, 2026
a7db693
Addressed copilot comments:
danielinux Feb 9, 2026
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48 changes: 48 additions & 0 deletions src/test/unit/unit.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1039,6 +1039,52 @@ START_TEST(test_udp_sendto_and_recvfrom)
}
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END_TEST

START_TEST(test_udp_recvfrom_sets_remote_ip)
{
struct wolfIP s;
int sd;
struct wolfIP_sockaddr_in sin;
uint8_t payload[4] = {0xAA, 0xBB, 0xCC, 0xDD};
uint8_t rxbuf[4] = {0};
struct wolfIP_sockaddr_in from;
socklen_t from_len = sizeof(from);
int ret;
ip4 local_ip = 0x0A000001U;
ip4 remote_ip = 0x0A000002U;
uint16_t local_port = 4001;
uint16_t remote_port = 5001;
struct tsocket *ts;

wolfIP_init(&s);
mock_link_init(&s);
wolfIP_ipconfig_set(&s, local_ip, 0xFFFFFF00U, 0);

sd = wolfIP_sock_socket(&s, AF_INET, IPSTACK_SOCK_DGRAM, WI_IPPROTO_UDP);
ck_assert_int_gt(sd, 0);

memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = ee16(local_port);
sin.sin_addr.s_addr = ee32(local_ip);
ret = wolfIP_sock_bind(&s, sd, (struct wolfIP_sockaddr *)&sin, sizeof(sin));
ck_assert_int_eq(ret, 0);

ts = &s.udpsockets[SOCKET_UNMARK(sd)];
ck_assert_uint_eq(ts->remote_ip, 0);

inject_udp_datagram(&s, TEST_PRIMARY_IF, remote_ip, local_ip, remote_port, local_port,
payload, sizeof(payload));

memset(&from, 0, sizeof(from));
ret = wolfIP_sock_recvfrom(&s, sd, rxbuf, sizeof(rxbuf), 0,
(struct wolfIP_sockaddr *)&from, &from_len);
ck_assert_int_eq(ret, (int)sizeof(payload));
ck_assert_mem_eq(rxbuf, payload, sizeof(payload));
ck_assert_uint_eq(from.sin_addr.s_addr, ee32(remote_ip));
ck_assert_uint_eq(ts->remote_ip, remote_ip);
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}
END_TEST

START_TEST(test_sock_error_paths)
{
struct wolfIP s;
Expand Down Expand Up @@ -12082,6 +12128,8 @@ Suite *wolf_suite(void)
suite_add_tcase(s, tc_proto);
tcase_add_test(tc_proto, test_udp_sendto_and_recvfrom);
suite_add_tcase(s, tc_proto);
tcase_add_test(tc_proto, test_udp_recvfrom_sets_remote_ip);
suite_add_tcase(s, tc_proto);
tcase_add_test(tc_proto, test_dns_query_and_callback_a);
suite_add_tcase(s, tc_proto);
tcase_add_test(tc_proto, test_dhcp_parse_offer_and_ack);
Expand Down
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