261 lines
6.8 KiB
C++
261 lines
6.8 KiB
C++
/*
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* ZeroTier SDK - Network Virtualization Everywhere
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* Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* You can be released from the requirements of the license by purchasing
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* a commercial license. Buying such a license is mandatory as soon as you
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* develop commercial closed-source software that incorporates or links
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* directly against ZeroTier software without disclosing the source code
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* of your own application.
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*/
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/**
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* @file
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*
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* Application-facing, partially-POSIX-compliant socket API
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*/
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#include <cstring>
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#include "lwip/sockets.h"
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#include "lwip/sys.h"
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#include "lwip/ip_addr.h"
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#include "libzt.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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void sys2lwip(int fd, const struct sockaddr *orig, struct sockaddr *modified) {
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/* Inelegant fix for lwIP 'sequential' API address error check (in sockets.c). For some reason
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lwIP seems to lose track of the sa_family for the socket internally, when lwip_connect()
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is called, it thus receives an AF_UNSPEC socket which fails. Here we use lwIP's own facilities
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to get the sa_family ourselves and rebuild the address structure and pass it to lwip_connect().
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I suspect this is due to a struct memory alignment issue. */
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struct sockaddr_storage ss;
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socklen_t namelen = sizeof(ss);
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int err = 0;
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if ((err = lwip_getsockname(fd, (struct sockaddr*)&ss, &namelen)) < 0) {
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DEBUG_ERROR("error while determining socket family");
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return;
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}
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if (ss.ss_family == AF_INET) {
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#if defined(__linux__)
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struct sockaddr_in *modified_ptr = (struct sockaddr_in *)modified;
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struct sockaddr_in *addr4 = (struct sockaddr_in*)orig;
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modified_ptr->sin_len = sizeof(struct sockaddr_in);
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modified_ptr->sin_family = ss.ss_family;
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modified_ptr->sin_port = addr4->sin_port;
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modified_ptr->sin_addr.s_addr = addr4->sin_addr.s_addr;
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#else
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memcpy(modified, orig, sizeof(struct sockaddr_in));
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#endif
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}
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if (ss.ss_family == AF_INET) {
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#if defined(__linux__)
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#else
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#endif
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}
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}
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int zts_socket(int socket_family, int socket_type, int protocol)
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{
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DEBUG_EXTRA("family=%d, type=%d, proto=%d", socket_family, socket_type, protocol);
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return lwip_socket(socket_family, socket_type, protocol);
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}
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int zts_connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
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{
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DEBUG_EXTRA("fd=%d",fd);
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struct sockaddr_storage ss;
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sys2lwip(fd, addr, (struct sockaddr*)&ss);
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return lwip_connect(fd, (struct sockaddr*)&ss, addrlen);
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}
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int zts_bind(int fd, const struct sockaddr *addr, socklen_t addrlen)
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{
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DEBUG_EXTRA("fd=%d", fd);
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struct sockaddr_storage ss;
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sys2lwip(fd, addr, (struct sockaddr*)&ss);
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return lwip_bind(fd, (struct sockaddr*)&ss, addrlen);
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}
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int zts_listen(int fd, int backlog)
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{
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DEBUG_EXTRA("fd=%d", fd);
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return lwip_listen(fd, backlog);
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}
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int zts_accept(int fd, struct sockaddr *addr, socklen_t *addrlen)
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{
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DEBUG_EXTRA("fd=%d", fd);
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return lwip_accept(fd, addr, addrlen);
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}
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#if defined(__linux__)
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int zts_accept4(int fd, struct sockaddr *addr, socklen_t *addrlen, int flags)
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{
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DEBUG_EXTRA("fd=%d", fd);
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return zts_accept(fd, addr, addrlen);
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}
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#endif
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int zts_setsockopt(int fd, int level, int optname, const void *optval, socklen_t optlen)
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{
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DEBUG_EXTRA("fd=%d, level=%d, optname=%d", fd, level, optname);
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return lwip_setsockopt(fd, level, optname, optval, optlen);
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}
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int zts_getsockopt(int fd, int level, int optname, void *optval, socklen_t *optlen)
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{
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DEBUG_EXTRA("fd=%d, level=%d, optname=%d", fd, level, optname);
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return lwip_getsockopt(fd, level, optname, optval, optlen);
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}
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int zts_getsockname(int fd, struct sockaddr *addr, socklen_t *addrlen)
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{
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DEBUG_EXTRA("fd=%p", fd);
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return lwip_getsockname(fd, addr, addrlen);
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}
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int zts_getpeername(int fd, struct sockaddr *addr, socklen_t *addrlen)
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{
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DEBUG_EXTRA("fd=%d", fd);
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return lwip_getpeername(fd, addr, addrlen);
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}
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int zts_gethostname(char *name, size_t len)
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{
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DEBUG_EXTRA();
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return -1;
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}
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int zts_sethostname(const char *name, size_t len)
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{
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DEBUG_EXTRA();
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return -1;
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}
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int zts_close(int fd)
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{
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DEBUG_EXTRA("fd=%d", fd);
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return lwip_close(fd);
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}
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int zts_poll(struct pollfd *fds, nfds_t nfds, int timeout)
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{
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DEBUG_EXTRA();
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return poll(fds, nfds, timeout);
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}
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int zts_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
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{
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DEBUG_EXTRA();
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return select(nfds, readfds, writefds, exceptfds, timeout);
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}
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int zts_fcntl(int fd, int cmd, int flags)
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{
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DEBUG_EXTRA("fd=%p, cmd=%d, flags=%d", cmd, flags);
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int translated_flags = 0;
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if (flags == 2048) {
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translated_flags = 1;
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}
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return lwip_fcntl(fd, cmd, translated_flags);
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}
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int zts_ioctl(int fd, unsigned long request, void *argp)
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{
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DEBUG_EXTRA("fd=%d, req=%d", fd, request);
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return lwip_ioctl(fd, request, argp);
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}
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ssize_t zts_sendto(int fd, const void *buf, size_t len, int flags, const struct sockaddr *addr, socklen_t addrlen)
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{
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DEBUG_TRANS("fd=%d, len=%d", fd, len);
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struct sockaddr_storage ss;
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sys2lwip(fd, addr, (struct sockaddr*)&ss);
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return lwip_sendto(fd, buf, len, flags, (struct sockaddr*)&ss, addrlen);
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}
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ssize_t zts_send(int fd, const void *buf, size_t len, int flags)
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{
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DEBUG_TRANS("fd=%d, len=%d", fd, len);
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return lwip_send(fd, buf, len, flags);
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}
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ssize_t zts_sendmsg(int fd, const struct msghdr *msg, int flags)
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{
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DEBUG_TRANS("fd=%d", fd);
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return lwip_sendmsg(fd, msg, flags);
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}
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ssize_t zts_recv(int fd, void *buf, size_t len, int flags)
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{
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DEBUG_TRANS("fd=%d", fd);
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return lwip_recv(fd, buf, len, flags);
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}
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ssize_t zts_recvfrom(int fd, void *buf, size_t len, int flags, struct sockaddr *addr, socklen_t *addrlen)
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{
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DEBUG_TRANS("fd=%d", fd);
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return lwip_recvfrom(fd, buf, len, flags, addr, addrlen);
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}
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ssize_t zts_recvmsg(int fd, struct msghdr *msg,int flags)
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{
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DEBUG_TRANS("fd=%d", fd);
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return -1;
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}
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int zts_read(int fd, void *buf, size_t len) {
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DEBUG_TRANS("fd=%d, len=%d", fd, len);
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return lwip_read(fd, buf, len);
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}
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int zts_write(int fd, const void *buf, size_t len) {
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DEBUG_TRANS("fd=%d, len=%d", fd, len);
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return lwip_write(fd, buf, len);
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}
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int zts_shutdown(int fd, int how)
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{
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DEBUG_EXTRA("fd=%d, how=%d", fd, how);
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return lwip_shutdown(fd, how);
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}
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int zts_add_dns_nameserver(struct sockaddr *addr)
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{
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DEBUG_EXTRA();
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return -1;
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}
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int zts_del_dns_nameserver(struct sockaddr *addr)
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{
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DEBUG_EXTRA();
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return -1;
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}
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#ifdef __cplusplus
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}
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#endif
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