mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
545 lines
18 KiB
C
545 lines
18 KiB
C
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2015 ZeroTier, Inc.
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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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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#ifdef USE_GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <unistd.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <dlfcn.h>
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#include <strings.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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#include <pwd.h>
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#include <errno.h>
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#include <linux/errno.h>
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#include <stdarg.h>
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#include <netdb.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/poll.h>
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#include <sys/un.h>
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#include <arpa/inet.h>
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#include <sys/resource.h>
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#include <linux/net.h> /* for NPROTO */
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#define SOCK_MAX (SOCK_PACKET + 1)
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#define SOCK_TYPE_MASK 0xf
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#include "Intercept.h"
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#include "RPC.h"
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#include "common.inc.c"
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/*------------------------------------------------------------------------------
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------------------- Intercept<--->Service Comm mechanisms ----------------------
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------------------------------------------------------------------------------*/
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static char *netpath = (char *)0;
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/* Check whether the socket is mapped to the service or not. We
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need to know if this is a regular AF_LOCAL socket or an end of a socketpair
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that the service uses. We don't want to keep state in the intercept, so
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we simply ask the service via an RPC */
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static int connected_to_service(int sockfd)
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{
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dwr(MSG_DEBUG,"connected_to_service():\n");
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socklen_t len;
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struct sockaddr_storage addr;
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len = sizeof addr;
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struct sockaddr_un * addr_un;
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getpeername(sockfd, (struct sockaddr*)&addr, &len);
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if (addr.ss_family == AF_LOCAL || addr.ss_family == AF_LOCAL) {
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addr_un = (struct sockaddr_un*)&addr;
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if(strcmp(addr_un->sun_path, netpath) == 0) {
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dwr(MSG_DEBUG,"connected_to_service(): Yes, %s\n", addr_un->sun_path);
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return 1;
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}
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}
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dwr(MSG_DEBUG,"connected_to_service(): Not connected to service\n");
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return 0;
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}
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/* get symbols and initialize mutexes */
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static int set_up_intercept()
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{
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if (!realconnect) {
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realconnect = dlsym(RTLD_NEXT, "connect");
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realbind = dlsym(RTLD_NEXT, "bind");
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realaccept = dlsym(RTLD_NEXT, "accept");
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reallisten = dlsym(RTLD_NEXT, "listen");
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realsocket = dlsym(RTLD_NEXT, "socket");
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realbind = dlsym(RTLD_NEXT, "bind");
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realsetsockopt = dlsym(RTLD_NEXT, "setsockopt");
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realgetsockopt = dlsym(RTLD_NEXT, "getsockopt");
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realaccept4 = dlsym(RTLD_NEXT, "accept4");
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realclose = dlsym(RTLD_NEXT, "close");
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realsyscall = dlsym(RTLD_NEXT, "syscall");
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realgetsockname = dlsym(RTLD_NEXT, "getsockname");
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}
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if (!netpath) {
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netpath = getenv("ZT_NC_NETWORK");
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if (!netpath)
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return 0;
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dwr(MSG_DEBUG,"Connecting to service at: %s\n", netpath);
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/* Hook/intercept Posix net API symbols */
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rpc_mutex_init();
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}
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return 1;
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}
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/*------------------------------------------------------------------------------
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--------------------------------- setsockopt() ---------------------------------
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------------------------------------------------------------------------------*/
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/* int socket, int level, int option_name, const void *option_value, socklen_t option_len */
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int setsockopt(SETSOCKOPT_SIG)
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{
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if (!set_up_intercept())
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return realsetsockopt(socket, level, option_name, option_value, option_len);
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dwr(MSG_DEBUG,"setsockopt(%d)\n", socket);
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if(level == SOL_IPV6 && option_name == IPV6_V6ONLY)
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return 0;
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if(level == SOL_IP && (option_name == IP_TTL || option_name == IP_TOS))
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return 0;
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if(level == IPPROTO_TCP || (level == SOL_SOCKET && option_name == SO_KEEPALIVE))
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return 0;
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if(realsetsockopt(socket, level, option_name, option_value, option_len) < 0)
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perror("setsockopt():\n");
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return 0;
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}
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/*------------------------------------------------------------------------------
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--------------------------------- getsockopt() ---------------------------------
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------------------------------------------------------------------------------*/
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/* int sockfd, int level, int optname, void *optval, socklen_t *optlen */
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int getsockopt(GETSOCKOPT_SIG)
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{
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dwr(MSG_DEBUG,"getsockopt(%d)\n", sockfd);
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if (!set_up_intercept() || !connected_to_service(sockfd))
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return realgetsockopt(sockfd, level, optname, optval, optlen);
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if(optname == SO_TYPE) {
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int* val = (int*)optval;
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*val = 2;
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optval = (void*)val;
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}
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return 0;
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}
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/*------------------------------------------------------------------------------
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----------------------------------- socket() -----------------------------------
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------------------------------------------------------------------------------*/
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/* int socket_family, int socket_type, int protocol
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socket() intercept function */
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int socket(SOCKET_SIG)
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{
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if (!set_up_intercept())
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return realsocket(socket_family, socket_type, protocol);
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dwr(MSG_DEBUG,"socket():\n");
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/* Check that type makes sense */
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int flags = socket_type & ~SOCK_TYPE_MASK;
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if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) {
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errno = EINVAL;
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return -1;
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}
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socket_type &= SOCK_TYPE_MASK;
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/* Check protocol is in range */
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if (socket_family < 0 || socket_family >= NPROTO){
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errno = EAFNOSUPPORT;
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return -1;
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}
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if (socket_type < 0 || socket_type >= SOCK_MAX) {
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errno = EINVAL;
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return -1;
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}
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/* TODO: detect ENFILE condition */
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if(socket_family == AF_LOCAL
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|| socket_family == AF_NETLINK
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|| socket_family == AF_UNIX) {
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int err = realsocket(socket_family, socket_type, protocol);
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dwr(MSG_DEBUG,"realsocket() = %d\n", err);
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return err;
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}
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/* Assemble and send RPC */
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struct socket_st rpc_st;
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rpc_st.socket_family = socket_family;
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rpc_st.socket_type = socket_type;
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rpc_st.protocol = protocol;
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rpc_st.__tid = syscall(SYS_gettid);
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/* -1 is passed since we we're generating the new socket in this call */
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return rpc_send_command(netpath, RPC_SOCKET, -1, &rpc_st, sizeof(struct socket_st));
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}
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/*------------------------------------------------------------------------------
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---------------------------------- connect() -----------------------------------
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------------------------------------------------------------------------------*/
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/* int __fd, const struct sockaddr * __addr, socklen_t __len
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connect() intercept function */
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int connect(CONNECT_SIG)
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{
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if (!set_up_intercept())
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return realconnect(__fd, __addr, __len);
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struct sockaddr_in *connaddr;
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connaddr = (struct sockaddr_in *)__addr;
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if(__addr->sa_family == AF_LOCAL || __addr->sa_family == AF_UNIX) {
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struct sockaddr_storage storage;
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memcpy(&storage, __addr, __len);
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struct sockaddr_un *s_un = (struct sockaddr_un*)&storage;
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dwr(MSG_DEBUG, "connect(): address = %s\n", s_un->sun_path);
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}
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int port = connaddr->sin_port;
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int ip = connaddr->sin_addr.s_addr;
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unsigned char d[4];
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d[0] = ip & 0xFF;
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d[1] = (ip >> 8) & 0xFF;
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d[2] = (ip >> 16) & 0xFF;
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d[3] = (ip >> 24) & 0xFF;
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dwr(MSG_DEBUG,"connect(): %d.%d.%d.%d: %d\n", d[0],d[1],d[2],d[3], ntohs(port));
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dwr(MSG_DEBUG,"connect(%d):\n", __fd);
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/* Check that this is a valid fd */
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if(fcntl(__fd, F_GETFD) < 0) {
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errno = EBADF;
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return -1;
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}
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/* Check that it is a socket */
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int sock_type;
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socklen_t sock_type_len = sizeof(sock_type);
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if(getsockopt(__fd, SOL_SOCKET, SO_TYPE, (void *) &sock_type, &sock_type_len) < 0) {
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errno = ENOTSOCK;
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return -1;
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}
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/* Check family */
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if (connaddr->sin_family < 0 || connaddr->sin_family >= NPROTO){
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errno = EAFNOSUPPORT;
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return -1;
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}
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/* make sure we don't touch any standard outputs */
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if(__fd == STDIN_FILENO || __fd == STDOUT_FILENO || __fd == STDERR_FILENO)
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return(realconnect(__fd, __addr, __len));
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if(__addr != NULL && (connaddr->sin_family == AF_LOCAL
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|| connaddr->sin_family == PF_NETLINK
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|| connaddr->sin_family == AF_NETLINK
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|| connaddr->sin_family == AF_UNIX)) {
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return realconnect(__fd, __addr, __len);
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}
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/* Assemble and send RPC */
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struct connect_st rpc_st;
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rpc_st.__tid = syscall(SYS_gettid);
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rpc_st.__fd = __fd;
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memcpy(&rpc_st.__addr, __addr, sizeof(struct sockaddr_storage));
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memcpy(&rpc_st.__len, &__len, sizeof(socklen_t));
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return rpc_send_command(netpath, RPC_CONNECT, __fd, &rpc_st, sizeof(struct connect_st));
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}
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/*------------------------------------------------------------------------------
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------------------------------------ bind() ------------------------------------
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------------------------------------------------------------------------------*/
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/* int sockfd, const struct sockaddr *addr, socklen_t addrlen
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bind() intercept function */
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int bind(BIND_SIG)
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{
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if (!set_up_intercept())
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return realbind(sockfd, addr, addrlen);
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dwr(MSG_DEBUG,"bind(%d):\n", sockfd);
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/* Check that this is a valid fd */
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if(fcntl(sockfd, F_GETFD) < 0) {
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errno = EBADF;
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return -1;
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}
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/* Check that it is a socket */
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int opt = -1;
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socklen_t opt_len;
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if(getsockopt(sockfd, SOL_SOCKET, SO_TYPE, (void *) &opt, &opt_len) < 0) {
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errno = ENOTSOCK;
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return -1;
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}
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/* make sure we don't touch any standard outputs */
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if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
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return(realbind(sockfd, addr, addrlen));
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/* If local, just use normal syscall */
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struct sockaddr_in *connaddr;
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connaddr = (struct sockaddr_in *)addr;
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if(connaddr->sin_family == AF_LOCAL
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|| connaddr->sin_family == AF_NETLINK
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|| connaddr->sin_family == AF_UNIX) {
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int err = realbind(sockfd, addr, addrlen);
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dwr(MSG_DEBUG,"realbind, err = %d\n", err);
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return err;
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}
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int port = connaddr->sin_port;
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int ip = connaddr->sin_addr.s_addr;
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unsigned char d[4];
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d[0] = ip & 0xFF;
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d[1] = (ip >> 8) & 0xFF;
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d[2] = (ip >> 16) & 0xFF;
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d[3] = (ip >> 24) & 0xFF;
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dwr(MSG_DEBUG,"bind(): %d.%d.%d.%d: %d\n", d[0],d[1],d[2],d[3], ntohs(port));
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/* Assemble and send RPC */
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struct bind_st rpc_st;
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rpc_st.sockfd = sockfd;
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rpc_st.__tid = syscall(SYS_gettid);
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memcpy(&rpc_st.addr, addr, sizeof(struct sockaddr_storage));
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memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t));
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return rpc_send_command(netpath, RPC_BIND, sockfd, &rpc_st, sizeof(struct bind_st));
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}
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/*------------------------------------------------------------------------------
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----------------------------------- accept4() ----------------------------------
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------------------------------------------------------------------------------*/
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/* int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags */
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int accept4(ACCEPT4_SIG)
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{
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dwr(MSG_DEBUG,"accept4(%d):\n", sockfd);
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if ((flags & SOCK_CLOEXEC))
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fcntl(sockfd, F_SETFL, FD_CLOEXEC);
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if ((flags & SOCK_NONBLOCK))
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fcntl(sockfd, F_SETFL, O_NONBLOCK);
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return accept(sockfd, addr, addrlen);
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}
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/*------------------------------------------------------------------------------
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----------------------------------- accept() -----------------------------------
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------------------------------------------------------------------------------*/
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/* int sockfd struct sockaddr *addr, socklen_t *addrlen
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accept() intercept function */
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int accept(ACCEPT_SIG)
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{
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if (!set_up_intercept())
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return realaccept(sockfd, addr, addrlen);
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dwr(MSG_DEBUG,"accept(%d):\n", sockfd);
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/* Check that this is a valid fd */
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if(fcntl(sockfd, F_GETFD) < 0) {
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return -1;
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errno = EBADF;
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dwr(MSG_DEBUG,"EBADF\n");
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return -1;
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}
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/* Check that it is a socket */
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int opt;
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socklen_t opt_len;
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if(getsockopt(sockfd, SOL_SOCKET, SO_TYPE, (void *) &opt, &opt_len) < 0) {
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errno = ENOTSOCK;
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dwr(MSG_DEBUG,"ENOTSOCK\n");
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return -1;
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}
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/* Check that this socket supports accept() */
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if(!(opt && (SOCK_STREAM | SOCK_SEQPACKET))) {
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errno = EOPNOTSUPP;
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dwr(MSG_DEBUG,"EOPNOTSUPP\n");
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return -1;
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}
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/* Check that we haven't hit the soft-limit file descriptors allowed */
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struct rlimit rl;
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getrlimit(RLIMIT_NOFILE, &rl);
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if(sockfd >= rl.rlim_cur){
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errno = EMFILE;
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dwr(MSG_DEBUG,"EMFILE\n");
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return -1;
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}
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/* Check address length */
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if(addrlen < 0) {
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errno = EINVAL;
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dwr(MSG_DEBUG,"EINVAL\n");
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return -1;
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}
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/* redirect calls for standard I/O descriptors to kernel */
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if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO){
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dwr(MSG_DEBUG,"realaccept():\n");
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return(realaccept(sockfd, addr, addrlen));
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}
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if(addr)
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addr->sa_family = AF_INET;
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int new_fd = get_new_fd(sockfd);
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if(new_fd > 0) {
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errno = ERR_OK;
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return new_fd;
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}
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errno = EAGAIN;
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return -EAGAIN;
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}
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/*------------------------------------------------------------------------------
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------------------------------------- listen()----------------------------------
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------------------------------------------------------------------------------*/
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/* int sockfd, int backlog */
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int listen(LISTEN_SIG)
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{
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if (!set_up_intercept())
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return(reallisten(sockfd, backlog));
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dwr(MSG_DEBUG,"listen(%d):\n", sockfd);
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int sock_type;
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socklen_t sock_type_len = sizeof(sock_type);
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/* Check that this is a valid fd */
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if(fcntl(sockfd, F_GETFD) < 0) {
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errno = EBADF;
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return -1;
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}
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/* Check that it is a socket */
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if(getsockopt(sockfd, SOL_SOCKET, SO_TYPE, (void *) &sock_type, &sock_type_len) < 0) {
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errno = ENOTSOCK;
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return -1;
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}
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/* Check that this socket supports accept() */
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if(!(sock_type && (SOCK_STREAM | SOCK_SEQPACKET))) {
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errno = EOPNOTSUPP;
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return -1;
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}
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/* make sure we don't touch any standard outputs */
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if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
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return(reallisten(sockfd, backlog));
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if(!connected_to_service(sockfd)) {
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reallisten(sockfd, backlog);
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}
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/* Assemble and send RPC */
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struct listen_st rpc_st;
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rpc_st.sockfd = sockfd;
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rpc_st.backlog = backlog;
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rpc_st.__tid = syscall(SYS_gettid);
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return rpc_send_command(netpath, RPC_LISTEN, sockfd, &rpc_st, sizeof(struct listen_st));
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}
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/*------------------------------------------------------------------------------
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------------------------------------- close() ----------------------------------
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------------------------------------------------------------------------------*/
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/* int fd */
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int close(CLOSE_SIG)
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{
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dwr(MSG_DEBUG, "close(%d)\n", fd);
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set_up_intercept();
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return realclose(fd);
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}
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/*------------------------------------------------------------------------------
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-------------------------------- getsockname() ---------------------------------
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------------------------------------------------------------------------------*/
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/* int sockfd, struct sockaddr *addr, socklen_t *addrlen */
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int getsockname(GETSOCKNAME_SIG)
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{
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if (!set_up_intercept())
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return realgetsockname(sockfd, addr, addrlen);
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dwr(MSG_DEBUG,"getsockname(%d)\n", sockfd);
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if(!connected_to_service(sockfd)) {
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dwr(MSG_DEBUG,"getsockname(): not used by service\n");
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return realgetsockname(sockfd, addr, addrlen);
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}
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/* This is kind of a hack as it stands -- assumes sockaddr is sockaddr_in
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* and is an IPv4 address. */
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/* assemble and send command */
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struct getsockname_st rpc_st;
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rpc_st.sockfd = sockfd;
|
|
memcpy(&rpc_st.addr, addr, *addrlen);
|
|
memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t));
|
|
int rpcfd = rpc_send_command(netpath, RPC_GETSOCKNAME, sockfd, &rpc_st, sizeof(struct getsockname_st));
|
|
/* read address info from service */
|
|
char addrbuf[sizeof(struct sockaddr_storage)];
|
|
memset(&addrbuf, 0, sizeof(struct sockaddr_storage));
|
|
|
|
if(rpcfd > -1)
|
|
if(read(rpcfd, &addrbuf, sizeof(struct sockaddr_storage)) > 0)
|
|
close(rpcfd);
|
|
|
|
struct sockaddr_storage sock_storage;
|
|
memcpy(&sock_storage, addrbuf, sizeof(struct sockaddr_storage));
|
|
*addrlen = sizeof(struct sockaddr_in);
|
|
memcpy(addr, &sock_storage, (*addrlen > sizeof(sock_storage)) ? sizeof(sock_storage) : *addrlen);
|
|
addr->sa_family = AF_INET;
|
|
return 0;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
------------------------------------ syscall() ---------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
long syscall(SYSCALL_SIG)
|
|
{
|
|
va_list ap;
|
|
uintptr_t a,b,c,d,e,f;
|
|
va_start(ap, number);
|
|
a=va_arg(ap, uintptr_t);
|
|
b=va_arg(ap, uintptr_t);
|
|
c=va_arg(ap, uintptr_t);
|
|
d=va_arg(ap, uintptr_t);
|
|
e=va_arg(ap, uintptr_t);
|
|
f=va_arg(ap, uintptr_t);
|
|
va_end(ap);
|
|
|
|
if (!set_up_intercept())
|
|
return realsyscall(number,a,b,c,d,e,f);
|
|
|
|
dwr(MSG_DEBUG_EXTRA,"syscall(%u, ...):\n", number);
|
|
|
|
#if defined(__i386__)
|
|
/* TODO: Implement for 32-bit systems: syscall(__NR_socketcall, 18, args);
|
|
args[0] = (unsigned long) fd;
|
|
args[1] = (unsigned long) addr;
|
|
args[2] = (unsigned long) addrlen;
|
|
args[3] = (unsigned long) flags;
|
|
*/
|
|
#else
|
|
if(number == __NR_accept4) {
|
|
int sockfd = a;
|
|
struct sockaddr * addr = (struct sockaddr*)b;
|
|
socklen_t * addrlen = (socklen_t*)c;
|
|
int flags = d;
|
|
int old_errno = errno;
|
|
int err = accept4(sockfd, addr, addrlen, flags);
|
|
errno = old_errno;
|
|
err = err == -EBADF ? -EAGAIN : err;
|
|
return err;
|
|
}
|
|
#endif
|
|
return realsyscall(number,a,b,c,d,e,f);
|
|
}
|