* SWRAP HELPER FUNCTIONS
*********************************************************/
+/*
+ * We return 127.0.0.0 (default) or 10.53.57.0.
+ *
+ * This can be controlled by:
+ * SOCKET_WRAPPER_IPV4_NETWORK=127.0.0.0 (default)
+ * or
+ * SOCKET_WRAPPER_IPV4_NETWORK=10.53.57.0
+ */
+static in_addr_t swrap_ipv4_net(void)
+{
+ static int initialized;
+ static in_addr_t hv;
+ const char *net_str = NULL;
+ struct in_addr nv;
+ int ret;
+
+ if (initialized) {
+ return hv;
+ }
+ initialized = 1;
+
+ net_str = getenv("SOCKET_WRAPPER_IPV4_NETWORK");
+ if (net_str == NULL) {
+ net_str = "127.0.0.0";
+ }
+
+ ret = inet_pton(AF_INET, net_str, &nv);
+ if (ret <= 0) {
+ SWRAP_LOG(SWRAP_LOG_ERROR,
+ "INVALID IPv4 Network [%s]\n",
+ net_str);
+ abort();
+ }
+
+ hv = ntohl(nv.s_addr);
+
+ switch (hv) {
+ case 0x7f000000:
+ /* 127.0.0.0 */
+ break;
+ case 0x0a353900:
+ /* 10.53.57.0 */
+ break;
+ default:
+ SWRAP_LOG(SWRAP_LOG_ERROR,
+ "INVALID IPv4 Network [%s][0x%x] should be "
+ "127.0.0.0 or 10.53.57.0\n",
+ net_str, (unsigned)hv);
+ abort();
+ }
+
+ return hv;
+}
+
+/*
+ * This returns 127.255.255.255 or 10.255.255.255
+ */
+static in_addr_t swrap_ipv4_bcast(void)
+{
+ in_addr_t hv;
+
+ hv = swrap_ipv4_net();
+ hv |= IN_CLASSA_HOST;
+
+ return hv;
+}
+
+/*
+ * This returns 127.0.0.${iface} or 10.53.57.${iface}
+ */
+static in_addr_t swrap_ipv4_iface(unsigned int iface)
+{
+ in_addr_t hv;
+
+ if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
+ SWRAP_LOG(SWRAP_LOG_ERROR,
+ "swrap_ipv4_iface(%u) invalid!\n",
+ iface);
+ abort();
+ return -1;
+ }
+
+ hv = swrap_ipv4_net();
+ hv |= iface;
+
+ return hv;
+}
+
#ifdef HAVE_IPV6
/*
* FD00::5357:5FXX
return;
}
+ /*
+ * Intialize the static cache early before
+ * any thread is able to start.
+ */
+ (void)swrap_ipv4_net();
+
socket_wrapper_init_fds_idx();
/* Needs to be called inside the sockets_mutex lock here. */
static void set_socket_info_index(int fd, int idx)
{
+ SWRAP_LOG(SWRAP_LOG_TRACE,
+ "fd=%d idx=%d\n",
+ fd, idx);
socket_fds_idx[fd] = idx;
/* This builtin issues a full memory barrier. */
__sync_synchronize();
static void reset_socket_info_index(int fd)
{
+ SWRAP_LOG(SWRAP_LOG_TRACE,
+ "fd=%d idx=%d\n",
+ fd, -1);
set_socket_info_index(fd, -1);
}
memset(in2, 0, sizeof(*in2));
in2->sin_family = AF_INET;
- in2->sin_addr.s_addr = htonl((127<<24) | iface);
+ in2->sin_addr.s_addr = htonl(swrap_ipv4_iface(iface));
in2->sin_port = htons(prt);
*len = sizeof(*in2);
char u_type = '\0';
char b_type = '\0';
char a_type = '\0';
+ const unsigned int sw_net_addr = swrap_ipv4_net();
+ const unsigned int sw_bcast_addr = swrap_ipv4_bcast();
switch (si->type) {
case SOCK_STREAM:
is_bcast = 2;
type = a_type;
iface = socket_wrapper_default_iface();
- } else if (b_type && addr == 0x7FFFFFFF) {
- /* 127.255.255.255 only udp */
+ } else if (b_type && addr == sw_bcast_addr) {
+ /*
+ * 127.255.255.255
+ * or
+ * 10.255.255.255
+ * only udp
+ */
is_bcast = 1;
type = b_type;
iface = socket_wrapper_default_iface();
- } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
- /* 127.0.0.X */
+ } else if ((addr & 0xFFFFFF00) == sw_net_addr) {
+ /* 127.0.0.X or 10.53.57.X */
is_bcast = 0;
type = u_type;
iface = (addr & 0x000000FF);
char d_type = '\0';
char b_type = '\0';
char a_type = '\0';
+ const unsigned int sw_net_addr = swrap_ipv4_net();
+ const unsigned int sw_bcast_addr = swrap_ipv4_bcast();
prt = ntohs(in->sin_port);
is_bcast = 2;
type = a_type;
iface = socket_wrapper_default_iface();
- } else if (b_type && addr == 0x7FFFFFFF) {
+ } else if (b_type && addr == sw_bcast_addr) {
/* 127.255.255.255 only udp */
is_bcast = 1;
type = b_type;
iface = socket_wrapper_default_iface();
- } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
+ } else if ((addr & 0xFFFFFF00) == sw_net_addr) {
/* 127.0.0.X */
is_bcast = 0;
type = u_type;
ZERO_STRUCT(bind_in);
bind_in.sin_family = in->sin_family;
bind_in.sin_port = in->sin_port;
- bind_in.sin_addr.s_addr = htonl(0x7F000000 | iface);
-
+ bind_in.sin_addr.s_addr = htonl(swrap_ipv4_iface(iface));
si->bindname.sa_socklen = blen;
memcpy(&si->bindname.sa.in, &bind_in, blen);
}
if (strncmp(s, "./", 2) == 0) {
s += 2;
}
+ SWRAP_LOG(SWRAP_LOG_TRACE, "SOCKET_WRAPPER_PCAP_FILE: %s", s);
return s;
}
case AF_PACKET:
#endif /* AF_PACKET */
case AF_UNIX:
- return libc_socket(family, type, protocol);
+ fd = libc_socket(family, type, protocol);
+ if (fd != -1) {
+ /* Check if we have a stale fd and remove it */
+ swrap_remove_stale(fd);
+ SWRAP_LOG(SWRAP_LOG_TRACE,
+ "Unix socket fd=%d",
+ fd);
+ }
+ return fd;
default:
errno = EAFNOSUPPORT;
return -1;
fd = ret;
+ /* Check if we have a stale fd and remove it */
+ swrap_remove_stale(fd);
+
SWRAP_LOCK_SI(parent_si);
ret = sockaddr_convert_from_un(parent_si,
memset(&in, 0, sizeof(in));
in.sin_family = AF_INET;
- in.sin_addr.s_addr = htonl(127<<24 |
- socket_wrapper_default_iface());
+ in.sin_addr.s_addr = htonl(swrap_ipv4_iface(
+ socket_wrapper_default_iface()));
si->myname = (struct swrap_address) {
.sa_socklen = sizeof(in),
}
if (si->family != serv_addr->sa_family) {
+ SWRAP_LOG(SWRAP_LOG_ERROR,
+ "called for fd=%d (family=%d) called with invalid family=%d\n",
+ s, si->family, serv_addr->sa_family);
errno = EINVAL;
ret = -1;
goto done;
return libc_close(fd);
}
+ SWRAP_LOG(SWRAP_LOG_TRACE, "Close wrapper for fd=%d", fd);
reset_socket_info_index(fd);
si = swrap_get_socket_info(si_index);
dlclose(swrap.libc.socket_handle);
}
}
+
+#if defined(HAVE__SOCKET) && defined(HAVE__CLOSE)
+/*
+ * On FreeBSD 12 (and maybe other platforms)
+ * system libraries like libresolv prefix there
+ * syscalls with '_' in order to always use
+ * the symbols from libc.
+ *
+ * In the interaction with resolv_wrapper,
+ * we need to inject socket wrapper into libresolv,
+ * which means we need to private all socket
+ * related syscalls also with the '_' prefix.
+ *
+ * This is tested in Samba's 'make test',
+ * there we noticed that providing '_read'
+ * and '_open' would cause errors, which
+ * means we skip '_read', '_write' and
+ * all non socket related calls without
+ * further analyzing the problem.
+ */
+#define SWRAP_SYMBOL_ALIAS(__sym, __aliassym) \
+ extern typeof(__sym) __aliassym __attribute__ ((alias(#__sym)))
+
+#ifdef HAVE_ACCEPT4
+SWRAP_SYMBOL_ALIAS(accept4, _accept4);
+#endif
+SWRAP_SYMBOL_ALIAS(accept, _accept);
+SWRAP_SYMBOL_ALIAS(bind, _bind);
+SWRAP_SYMBOL_ALIAS(close, _close);
+SWRAP_SYMBOL_ALIAS(connect, _connect);
+SWRAP_SYMBOL_ALIAS(dup, _dup);
+SWRAP_SYMBOL_ALIAS(dup2, _dup2);
+SWRAP_SYMBOL_ALIAS(fcntl, _fcntl);
+SWRAP_SYMBOL_ALIAS(getpeername, _getpeername);
+SWRAP_SYMBOL_ALIAS(getsockname, _getsockname);
+SWRAP_SYMBOL_ALIAS(getsockopt, _getsockopt);
+SWRAP_SYMBOL_ALIAS(ioctl, _ioctl);
+SWRAP_SYMBOL_ALIAS(listen, _listen);
+SWRAP_SYMBOL_ALIAS(readv, _readv);
+SWRAP_SYMBOL_ALIAS(recv, _recv);
+SWRAP_SYMBOL_ALIAS(recvfrom, _recvfrom);
+SWRAP_SYMBOL_ALIAS(recvmsg, _recvmsg);
+SWRAP_SYMBOL_ALIAS(send, _send);
+SWRAP_SYMBOL_ALIAS(sendmsg, _sendmsg);
+SWRAP_SYMBOL_ALIAS(sendto, _sendto);
+SWRAP_SYMBOL_ALIAS(setsockopt, _setsockopt);
+SWRAP_SYMBOL_ALIAS(socket, _socket);
+SWRAP_SYMBOL_ALIAS(socketpair, _socketpair);
+SWRAP_SYMBOL_ALIAS(writev, _writev);
+
+#endif /* SOCKET_WRAPPER_EXPORT_UNDERSCORE_SYMBOLS */