END_TEST
START_TEST (parse_addr_test) {
const pr_netaddr_t *res;
const char *msg, *expected, *ip_str;
res = proxy_ftp_msg_parse_addr(NULL, NULL, 0);
fail_unless(res == NULL, "Failed to handle null pool");
fail_unless(errno == EINVAL, "Expected EINVAL (%d), got '%s' (%d)", EINVAL,
strerror(errno), errno);
res = proxy_ftp_msg_parse_addr(p, NULL, 0);
fail_unless(res == NULL, "Failed to handle null msg");
fail_unless(errno == EINVAL, "Expected EINVAL (%d), got '%s' (%d)", EINVAL,
strerror(errno), errno);
msg = "foo";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res == NULL, "Failed to handle invalid format");
fail_unless(errno == EPERM, "Expected EPERM (%d), got '%s' (%d)", EPERM,
strerror(errno), errno);
msg = "(a,b,c,d,e,f)";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res == NULL, "Failed to handle invalid format");
fail_unless(errno == EPERM, "Expected EPERM (%d), got '%s' (%d)", EPERM,
strerror(errno), errno);
msg = "(1000,2000,3000,4000,5000,6000)";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res == NULL, "Failed to handle invalid format");
fail_unless(errno == EINVAL, "Expected EINVAL (%d), got '%s' (%d)", EINVAL,
strerror(errno), errno);
msg = "(1,2,3,4,5000,6000)";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res == NULL, "Failed to handle invalid format");
fail_unless(errno == EINVAL, "Expected EINVAL (%d), got '%s' (%d)", EINVAL,
strerror(errno), errno);
msg = "(0,0,0,0,1,2)";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res == NULL, "Failed to handle invalid format");
fail_unless(errno == EINVAL, "Expected EINVAL (%d), got '%s' (%d)", EINVAL,
strerror(errno), errno);
msg = "(1,2,3,4,0,0)";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res == NULL, "Failed to handle invalid format");
fail_unless(errno == EINVAL, "Expected EINVAL (%d), got '%s' (%d)", EINVAL,
strerror(errno), errno);
msg = "(127,0,0,1,8,73)";
res = proxy_ftp_msg_parse_addr(p, msg, 0);
fail_unless(res != NULL, "Failed to parse message '%s': %s", msg,
strerror(errno));
ip_str = pr_netaddr_get_ipstr(res);
expected = "127.0.0.1";
fail_unless(strcmp(ip_str, expected) == 0, "Expected '%s', got '%s'",
expected, ip_str);
fail_unless(ntohs(pr_netaddr_get_port(res)) == 2121,
"Expected 2121, got %u", ntohs(pr_netaddr_get_port(res)));
#ifdef PR_USE_IPV6
msg = "(127,0,0,1,8,73)";
res = proxy_ftp_msg_parse_addr(p, msg, AF_INET);
fail_unless(res != NULL, "Failed to parse message '%s': %s", msg,
strerror(errno));
ip_str = pr_netaddr_get_ipstr(res);
expected = "127.0.0.1";
fail_unless(strcmp(ip_str, expected) == 0, "Expected '%s', got '%s'",
expected, ip_str);
msg = "(127,0,0,1,8,73)";
res = proxy_ftp_msg_parse_addr(p, msg, AF_INET6);
fail_unless(res != NULL, "Failed to parse message '%s': %s", msg,
strerror(errno));
ip_str = pr_netaddr_get_ipstr(res);
expected = "::ffff:127.0.0.1";
fail_unless(strcmp(ip_str, expected) == 0, "Expected '%s', got '%s'",
expected, ip_str);
pr_netaddr_disable_ipv6();
res = proxy_ftp_msg_parse_addr(p, msg, AF_INET6);
fail_unless(res != NULL, "Failed to parse message '%s': %s", msg,
strerror(errno));
ip_str = pr_netaddr_get_ipstr(res);
expected = "127.0.0.1";
fail_unless(strcmp(ip_str, expected) == 0, "Expected '%s', got '%s'",
expected, ip_str);
pr_netaddr_enable_ipv6();
#endif /* PR_USE_IPV6 */
}
const pr_netaddr_t *proxy_ftp_xfer_prepare_passive(int policy_id, cmd_rec *cmd,
const char *error_code, struct proxy_session *proxy_sess, int flags) {
int res, xerrno = 0;
cmd_rec *pasv_cmd;
const pr_netaddr_t *remote_addr = NULL;
pr_response_t *resp;
unsigned int resp_nlines = 0;
unsigned short remote_port;
char *passive_cmd, *passive_respcode = NULL;
if (cmd == NULL ||
error_code == NULL ||
proxy_sess == NULL ||
proxy_sess->backend_ctrl_conn == NULL) {
errno = EINVAL;
return NULL;
}
/* Whether we send a PASV (and expect 227) or an EPSV (and expect 229)
* need to depend on the policy_id.
*/
switch (policy_id) {
case PR_CMD_PASV_ID:
passive_cmd = C_PASV;
break;
case PR_CMD_EPSV_ID:
/* If the remote host does not mention EPSV in its features, fall back
* to using PASV.
*/
passive_cmd = C_EPSV;
if (pr_table_get(proxy_sess->backend_features, C_EPSV, NULL) == NULL) {
pr_trace_msg(trace_channel, 19,
"EPSV not supported by backend server (via FEAT), using PASV");
if (proxy_sess->dataxfer_policy == PR_CMD_EPSV_ID) {
proxy_sess->dataxfer_policy = PR_CMD_PASV_ID;
}
passive_cmd = C_PASV;
policy_id = PR_CMD_PASV_ID;
}
break;
default:
/* In this case, the cmd we were given is the one we should send to
* the backend server -- but only if it is either EPSV or PASV.
*/
if (pr_cmd_cmp(cmd, PR_CMD_EPSV_ID) != 0 &&
pr_cmd_cmp(cmd, PR_CMD_PASV_ID) != 0) {
pr_trace_msg(trace_channel, 9,
"illegal FTP passive transfer command '%s'", (char *) cmd->argv[0]);
errno = EINVAL;
return NULL;
}
passive_cmd = cmd->argv[0];
if (pr_cmd_cmp(cmd, PR_CMD_EPSV_ID) == 0) {
/* If the remote host does not mention EPSV in its features, fall back
* to using PASV.
*/
if (pr_table_get(proxy_sess->backend_features, C_EPSV, NULL) == NULL) {
pr_trace_msg(trace_channel, 19,
"EPSV not supported by backend server (via FEAT), using PASV");
if (proxy_sess->dataxfer_policy == PR_CMD_EPSV_ID) {
proxy_sess->dataxfer_policy = PR_CMD_PASV_ID;
}
passive_cmd = C_PASV;
policy_id = PR_CMD_PASV_ID;
}
}
break;
}
pasv_cmd = pr_cmd_alloc(cmd->tmp_pool, 1, passive_cmd);
switch (pr_cmd_get_id(pasv_cmd->argv[0])) {
case PR_CMD_PASV_ID:
passive_respcode = R_227;
break;
case PR_CMD_EPSV_ID:
passive_respcode = R_229;
break;
}
res = proxy_ftp_ctrl_send_cmd(cmd->tmp_pool, proxy_sess->backend_ctrl_conn,
pasv_cmd);
if (res < 0) {
xerrno = errno;
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error sending %s to backend: %s", (char *) pasv_cmd->argv[0],
strerror(xerrno));
pr_response_add_err(error_code, "%s: %s", (char *) cmd->argv[0],
strerror(xerrno));
pr_response_flush(&resp_err_list);
errno = xerrno;
return NULL;
}
resp = proxy_ftp_ctrl_recv_resp(cmd->tmp_pool, proxy_sess->backend_ctrl_conn,
&resp_nlines, flags);
if (resp == NULL) {
xerrno = errno;
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error receiving %s response from backend: %s",
(char *) pasv_cmd->argv[0], strerror(xerrno));
pr_response_add_err(error_code, "%s: %s", (char *) cmd->argv[0],
strerror(xerrno));
pr_response_flush(&resp_err_list);
errno = xerrno;
return NULL;
}
/* We specifically expect a 227 or 229 response code here; anything else is
* an error. Right?
*/
if (strncmp(resp->num, passive_respcode, 4) != 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"received response code %s, but expected %s for %s command", resp->num,
passive_respcode, (char *) pasv_cmd->argv[0]);
if (policy_id == PR_CMD_EPSV_ID) {
/* If using EPSV failed, try again using PASV, and switch the
* DataTransferPolicy (if EPSV) to be PASV, for future attempts.
*/
if (proxy_sess->dataxfer_policy == PR_CMD_EPSV_ID) {
pr_trace_msg(trace_channel, 15,
"falling back from EPSV to PASV DataTransferPolicy");
proxy_sess->dataxfer_policy = PR_CMD_PASV_ID;
}
return proxy_ftp_xfer_prepare_passive(PR_CMD_PASV_ID, cmd,
error_code, proxy_sess, flags);
}
res = proxy_ftp_ctrl_send_resp(cmd->tmp_pool,
proxy_sess->frontend_ctrl_conn, resp, resp_nlines);
errno = EPERM;
return NULL;
}
switch (pr_cmd_get_id(pasv_cmd->argv[0])) {
case PR_CMD_PASV_ID:
remote_addr = proxy_ftp_msg_parse_addr(cmd->tmp_pool, resp->msg,
pr_netaddr_get_family(session.c->local_addr));
break;
case PR_CMD_EPSV_ID:
remote_addr = proxy_ftp_msg_parse_ext_addr(cmd->tmp_pool, resp->msg,
session.c->remote_addr, PR_CMD_EPSV_ID, NULL);
break;
}
if (remote_addr == NULL) {
xerrno = errno;
pr_trace_msg(trace_channel, 2, "error parsing %s response '%s': %s",
(char *) pasv_cmd->argv[0], resp->msg, strerror(xerrno));
xerrno = EPERM;
pr_response_add_err(error_code, "%s: %s", (char *) cmd->argv[0],
strerror(xerrno));
pr_response_flush(&resp_err_list);
errno = xerrno;
return NULL;
}
remote_port = ntohs(pr_netaddr_get_port(remote_addr));
/* Make sure that the given address matches the address to which we
* originally connected.
*/
if (pr_netaddr_cmp(remote_addr,
proxy_sess->backend_ctrl_conn->remote_addr) != 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"Refused %s address %s (address mismatch with %s)",
(char *) pasv_cmd->argv[0], pr_netaddr_get_ipstr(remote_addr),
pr_netaddr_get_ipstr(proxy_sess->backend_ctrl_conn->remote_addr));
xerrno = EPERM;
pr_response_add_err(error_code, "%s: %s", (char *) cmd->argv[0],
strerror(xerrno));
pr_response_flush(&resp_err_list);
errno = xerrno;
return NULL;
}
if (remote_port < 1024) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"Refused %s port %hu (below 1024)",
(char *) pasv_cmd->argv[0], remote_port);
xerrno = EPERM;
pr_response_add_err(error_code, "%s: %s", (char *) cmd->argv[0],
strerror(xerrno));
pr_response_flush(&resp_err_list);
errno = xerrno;
return NULL;
}
return remote_addr;
}
