mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-24 15:16:40 +00:00
576 lines
18 KiB
C
576 lines
18 KiB
C
/*
|
|
* ZeroTier One - Network Virtualization Everywhere
|
|
* Copyright (C) 2011-2015 ZeroTier, Inc.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* --
|
|
*
|
|
* ZeroTier may be used and distributed under the terms of the GPLv3, which
|
|
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
|
|
*
|
|
* If you would like to embed ZeroTier into a commercial application or
|
|
* redistribute it in a modified binary form, please contact ZeroTier Networks
|
|
* LLC. Start here: http://www.zerotier.com/
|
|
*/
|
|
|
|
#ifdef USE_GNU_SOURCE
|
|
#define _GNU_SOURCE
|
|
#endif
|
|
|
|
#include <unistd.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <dlfcn.h>
|
|
#include <strings.h>
|
|
#include <netinet/in.h>
|
|
#include <sys/time.h>
|
|
#include <pwd.h>
|
|
#include <errno.h>
|
|
#include <stdarg.h>
|
|
#include <netdb.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/un.h>
|
|
#include <arpa/inet.h>
|
|
#include <sys/resource.h>
|
|
|
|
#if defined(__linux__)
|
|
#include <linux/errno.h>
|
|
#include <sys/syscall.h>
|
|
#include <linux/net.h> /* for NPROTO */
|
|
#endif
|
|
|
|
#if defined(__linux__)
|
|
#define SOCK_MAX (SOCK_PACKET + 1)
|
|
#endif
|
|
#define SOCK_TYPE_MASK 0xf
|
|
|
|
#include "Intercept.h"
|
|
#include "RPC.h"
|
|
#include "common.inc.c"
|
|
|
|
/*------------------------------------------------------------------------------
|
|
------------------- Intercept<--->Service Comm mechanisms ----------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
static char *netpath = (char *)0;
|
|
|
|
/* Check whether the socket is mapped to the service or not. We
|
|
need to know if this is a regular AF_LOCAL socket or an end of a socketpair
|
|
that the service uses. We don't want to keep state in the intercept, so
|
|
we simply ask the service via an RPC */
|
|
|
|
static int connected_to_service(int sockfd)
|
|
{
|
|
dwr(MSG_DEBUG,"connected_to_service():\n");
|
|
socklen_t len;
|
|
struct sockaddr_storage addr;
|
|
len = sizeof addr;
|
|
struct sockaddr_un * addr_un;
|
|
getpeername(sockfd, (struct sockaddr*)&addr, &len);
|
|
if (addr.ss_family == AF_LOCAL || addr.ss_family == AF_LOCAL) {
|
|
addr_un = (struct sockaddr_un*)&addr;
|
|
if(strcmp(addr_un->sun_path, netpath) == 0) {
|
|
dwr(MSG_DEBUG,"connected_to_service(): Yes, %s\n", addr_un->sun_path);
|
|
return 1;
|
|
}
|
|
}
|
|
dwr(MSG_DEBUG,"connected_to_service(): Not connected to service\n");
|
|
return 0;
|
|
}
|
|
|
|
/* get symbols and initialize mutexes */
|
|
static int set_up_intercept()
|
|
{
|
|
if (!realconnect) {
|
|
|
|
#if defined(__linux__)
|
|
realaccept4 = dlsym(RTLD_NEXT, "accept4");
|
|
realsyscall = dlsym(RTLD_NEXT, "syscall");
|
|
#endif
|
|
realconnect = dlsym(RTLD_NEXT, "connect");
|
|
realbind = dlsym(RTLD_NEXT, "bind");
|
|
realaccept = dlsym(RTLD_NEXT, "accept");
|
|
reallisten = dlsym(RTLD_NEXT, "listen");
|
|
realsocket = dlsym(RTLD_NEXT, "socket");
|
|
realbind = dlsym(RTLD_NEXT, "bind");
|
|
realsetsockopt = dlsym(RTLD_NEXT, "setsockopt");
|
|
realgetsockopt = dlsym(RTLD_NEXT, "getsockopt");
|
|
realclose = dlsym(RTLD_NEXT, "close");
|
|
realgetsockname = dlsym(RTLD_NEXT, "getsockname");
|
|
}
|
|
if (!netpath) {
|
|
netpath = getenv("ZT_NC_NETWORK");
|
|
if (!netpath)
|
|
return 0;
|
|
dwr(MSG_DEBUG,"Connecting to service at: %s\n", netpath);
|
|
/* Hook/intercept Posix net API symbols */
|
|
rpc_mutex_init();
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
--------------------------------- setsockopt() ---------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int socket, int level, int option_name, const void *option_value, socklen_t option_len */
|
|
int setsockopt(SETSOCKOPT_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return realsetsockopt(socket, level, option_name, option_value, option_len);
|
|
|
|
dwr(MSG_DEBUG,"setsockopt(%d)\n", socket);
|
|
#if defined(__linux__)
|
|
if(level == SOL_IPV6 && option_name == IPV6_V6ONLY)
|
|
return 0;
|
|
if(level == SOL_IP && (option_name == IP_TTL || option_name == IP_TOS))
|
|
return 0;
|
|
#endif
|
|
if(level == IPPROTO_TCP || (level == SOL_SOCKET && option_name == SO_KEEPALIVE))
|
|
return 0;
|
|
if(realsetsockopt(socket, level, option_name, option_value, option_len) < 0)
|
|
perror("setsockopt():\n");
|
|
return 0;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
--------------------------------- getsockopt() ---------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int sockfd, int level, int optname, void *optval, socklen_t *optlen */
|
|
int getsockopt(GETSOCKOPT_SIG)
|
|
{
|
|
dwr(MSG_DEBUG,"getsockopt(%d)\n", sockfd);
|
|
if (!set_up_intercept() || !connected_to_service(sockfd))
|
|
return realgetsockopt(sockfd, level, optname, optval, optlen);
|
|
if(optname == SO_TYPE) {
|
|
int* val = (int*)optval;
|
|
*val = 2;
|
|
optval = (void*)val;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
----------------------------------- socket() -----------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int socket_family, int socket_type, int protocol
|
|
socket() intercept function */
|
|
int socket(SOCKET_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return realsocket(socket_family, socket_type, protocol);
|
|
|
|
dwr(MSG_DEBUG,"socket():\n");
|
|
/* Check that type makes sense */
|
|
#if defined(__linux__)
|
|
int flags = socket_type & ~SOCK_TYPE_MASK;
|
|
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#endif
|
|
socket_type &= SOCK_TYPE_MASK;
|
|
/* Check protocol is in range */
|
|
#if defined(__linux__)
|
|
if (socket_family < 0 || socket_family >= NPROTO){
|
|
errno = EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
if (socket_type < 0 || socket_type >= SOCK_MAX) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#endif
|
|
/* TODO: detect ENFILE condition */
|
|
if(socket_family == AF_LOCAL
|
|
#if defined(__linux__)
|
|
|| socket_family == AF_NETLINK
|
|
#endif
|
|
|| socket_family == AF_UNIX) {
|
|
int err = realsocket(socket_family, socket_type, protocol);
|
|
dwr(MSG_DEBUG,"realsocket() = %d\n", err);
|
|
return err;
|
|
}
|
|
/* Assemble and send RPC */
|
|
struct socket_st rpc_st;
|
|
rpc_st.socket_family = socket_family;
|
|
rpc_st.socket_type = socket_type;
|
|
rpc_st.protocol = protocol;
|
|
rpc_st.__tid = syscall(SYS_gettid);
|
|
/* -1 is passed since we we're generating the new socket in this call */
|
|
return rpc_send_command(netpath, RPC_SOCKET, -1, &rpc_st, sizeof(struct socket_st));
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
---------------------------------- connect() -----------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int __fd, const struct sockaddr * __addr, socklen_t __len
|
|
connect() intercept function */
|
|
int connect(CONNECT_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return realconnect(__fd, __addr, __len);
|
|
|
|
struct sockaddr_in *connaddr;
|
|
connaddr = (struct sockaddr_in *)__addr;
|
|
if(__addr->sa_family == AF_LOCAL || __addr->sa_family == AF_UNIX) {
|
|
struct sockaddr_storage storage;
|
|
memcpy(&storage, __addr, __len);
|
|
struct sockaddr_un *s_un = (struct sockaddr_un*)&storage;
|
|
dwr(MSG_DEBUG, "connect(): address = %s\n", s_un->sun_path);
|
|
}
|
|
|
|
int port = connaddr->sin_port;
|
|
int ip = connaddr->sin_addr.s_addr;
|
|
unsigned char d[4];
|
|
d[0] = ip & 0xFF;
|
|
d[1] = (ip >> 8) & 0xFF;
|
|
d[2] = (ip >> 16) & 0xFF;
|
|
d[3] = (ip >> 24) & 0xFF;
|
|
dwr(MSG_DEBUG,"connect(): %d.%d.%d.%d: %d\n", d[0],d[1],d[2],d[3], ntohs(port));
|
|
|
|
dwr(MSG_DEBUG,"connect(%d):\n", __fd);
|
|
/* Check that this is a valid fd */
|
|
if(fcntl(__fd, F_GETFD) < 0) {
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
/* Check that it is a socket */
|
|
int sock_type;
|
|
socklen_t sock_type_len = sizeof(sock_type);
|
|
if(getsockopt(__fd, SOL_SOCKET, SO_TYPE, (void *) &sock_type, &sock_type_len) < 0) {
|
|
errno = ENOTSOCK;
|
|
return -1;
|
|
}
|
|
#if defined(__linux__)
|
|
/* Check family */
|
|
if (connaddr->sin_family < 0 || connaddr->sin_family >= NPROTO){
|
|
errno = EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
#endif
|
|
/* make sure we don't touch any standard outputs */
|
|
if(__fd == STDIN_FILENO || __fd == STDOUT_FILENO || __fd == STDERR_FILENO)
|
|
return(realconnect(__fd, __addr, __len));
|
|
|
|
if(__addr != NULL && (connaddr->sin_family == AF_LOCAL
|
|
#if defined(__linux__)
|
|
|| connaddr->sin_family == PF_NETLINK
|
|
|| connaddr->sin_family == AF_NETLINK
|
|
#endif
|
|
|| connaddr->sin_family == AF_UNIX)) {
|
|
return realconnect(__fd, __addr, __len);
|
|
}
|
|
/* Assemble and send RPC */
|
|
struct connect_st rpc_st;
|
|
#if defined(__linux__)
|
|
rpc_st.__tid = syscall(SYS_gettid);
|
|
#endif
|
|
rpc_st.__fd = __fd;
|
|
memcpy(&rpc_st.__addr, __addr, sizeof(struct sockaddr_storage));
|
|
memcpy(&rpc_st.__len, &__len, sizeof(socklen_t));
|
|
return rpc_send_command(netpath, RPC_CONNECT, __fd, &rpc_st, sizeof(struct connect_st));
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
------------------------------------ bind() ------------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int sockfd, const struct sockaddr *addr, socklen_t addrlen
|
|
bind() intercept function */
|
|
int bind(BIND_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return realbind(sockfd, addr, addrlen);
|
|
|
|
dwr(MSG_DEBUG,"bind(%d):\n", sockfd);
|
|
/* Check that this is a valid fd */
|
|
if(fcntl(sockfd, F_GETFD) < 0) {
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
/* Check that it is a socket */
|
|
int opt = -1;
|
|
socklen_t opt_len;
|
|
if(getsockopt(sockfd, SOL_SOCKET, SO_TYPE, (void *) &opt, &opt_len) < 0) {
|
|
errno = ENOTSOCK;
|
|
return -1;
|
|
}
|
|
/* make sure we don't touch any standard outputs */
|
|
if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
|
|
return(realbind(sockfd, addr, addrlen));
|
|
/* If local, just use normal syscall */
|
|
struct sockaddr_in *connaddr;
|
|
connaddr = (struct sockaddr_in *)addr;
|
|
|
|
if(connaddr->sin_family == AF_LOCAL
|
|
#if defined(__linux__)
|
|
|| connaddr->sin_family == AF_NETLINK
|
|
#endif
|
|
|| connaddr->sin_family == AF_UNIX) {
|
|
int err = realbind(sockfd, addr, addrlen);
|
|
dwr(MSG_DEBUG,"realbind, err = %d\n", err);
|
|
return err;
|
|
}
|
|
int port = connaddr->sin_port;
|
|
int ip = connaddr->sin_addr.s_addr;
|
|
unsigned char d[4];
|
|
d[0] = ip & 0xFF;
|
|
d[1] = (ip >> 8) & 0xFF;
|
|
d[2] = (ip >> 16) & 0xFF;
|
|
d[3] = (ip >> 24) & 0xFF;
|
|
dwr(MSG_DEBUG,"bind(): %d.%d.%d.%d: %d\n", d[0],d[1],d[2],d[3], ntohs(port));
|
|
/* Assemble and send RPC */
|
|
struct bind_st rpc_st;
|
|
rpc_st.sockfd = sockfd;
|
|
#if defined(__linux__)
|
|
rpc_st.__tid = syscall(SYS_gettid);
|
|
#endif
|
|
memcpy(&rpc_st.addr, addr, sizeof(struct sockaddr_storage));
|
|
memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t));
|
|
return rpc_send_command(netpath, RPC_BIND, sockfd, &rpc_st, sizeof(struct bind_st));
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
----------------------------------- accept4() ----------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags */
|
|
#if defined(__linux__)
|
|
int accept4(ACCEPT4_SIG)
|
|
{
|
|
dwr(MSG_DEBUG,"accept4(%d):\n", sockfd);
|
|
if ((flags & SOCK_CLOEXEC))
|
|
fcntl(sockfd, F_SETFL, FD_CLOEXEC);
|
|
if ((flags & SOCK_NONBLOCK))
|
|
fcntl(sockfd, F_SETFL, O_NONBLOCK);
|
|
return accept(sockfd, addr, addrlen);
|
|
}
|
|
#endif
|
|
|
|
/*------------------------------------------------------------------------------
|
|
----------------------------------- accept() -----------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int sockfd struct sockaddr *addr, socklen_t *addrlen
|
|
accept() intercept function */
|
|
int accept(ACCEPT_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return realaccept(sockfd, addr, addrlen);
|
|
|
|
dwr(MSG_DEBUG,"accept(%d):\n", sockfd);
|
|
/* Check that this is a valid fd */
|
|
if(fcntl(sockfd, F_GETFD) < 0) {
|
|
return -1;
|
|
errno = EBADF;
|
|
dwr(MSG_DEBUG,"EBADF\n");
|
|
return -1;
|
|
}
|
|
/* Check that it is a socket */
|
|
int opt;
|
|
socklen_t opt_len;
|
|
if(getsockopt(sockfd, SOL_SOCKET, SO_TYPE, (void *) &opt, &opt_len) < 0) {
|
|
errno = ENOTSOCK;
|
|
dwr(MSG_DEBUG,"ENOTSOCK\n");
|
|
return -1;
|
|
}
|
|
/* Check that this socket supports accept() */
|
|
if(!(opt && (SOCK_STREAM | SOCK_SEQPACKET))) {
|
|
errno = EOPNOTSUPP;
|
|
dwr(MSG_DEBUG,"EOPNOTSUPP\n");
|
|
return -1;
|
|
}
|
|
/* Check that we haven't hit the soft-limit file descriptors allowed */
|
|
struct rlimit rl;
|
|
getrlimit(RLIMIT_NOFILE, &rl);
|
|
if(sockfd >= rl.rlim_cur){
|
|
errno = EMFILE;
|
|
dwr(MSG_DEBUG,"EMFILE\n");
|
|
return -1;
|
|
}
|
|
/* Check address length */
|
|
if(addrlen < 0) {
|
|
errno = EINVAL;
|
|
dwr(MSG_DEBUG,"EINVAL\n");
|
|
return -1;
|
|
}
|
|
/* redirect calls for standard I/O descriptors to kernel */
|
|
if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO){
|
|
dwr(MSG_DEBUG,"realaccept():\n");
|
|
return(realaccept(sockfd, addr, addrlen));
|
|
}
|
|
if(addr)
|
|
addr->sa_family = AF_INET;
|
|
|
|
int new_fd = get_new_fd(sockfd);
|
|
if(new_fd > 0) {
|
|
errno = ERR_OK;
|
|
return new_fd;
|
|
}
|
|
errno = EAGAIN;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
------------------------------------- listen()----------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int sockfd, int backlog */
|
|
int listen(LISTEN_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return(reallisten(sockfd, backlog));
|
|
|
|
dwr(MSG_DEBUG,"listen(%d):\n", sockfd);
|
|
int sock_type;
|
|
socklen_t sock_type_len = sizeof(sock_type);
|
|
|
|
/* Check that this is a valid fd */
|
|
if(fcntl(sockfd, F_GETFD) < 0) {
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
/* Check that it is a socket */
|
|
if(getsockopt(sockfd, SOL_SOCKET, SO_TYPE, (void *) &sock_type, &sock_type_len) < 0) {
|
|
errno = ENOTSOCK;
|
|
return -1;
|
|
}
|
|
/* Check that this socket supports accept() */
|
|
if(!(sock_type && (SOCK_STREAM | SOCK_SEQPACKET))) {
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
/* make sure we don't touch any standard outputs */
|
|
if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
|
|
return(reallisten(sockfd, backlog));
|
|
|
|
if(!connected_to_service(sockfd)) {
|
|
reallisten(sockfd, backlog);
|
|
}
|
|
/* Assemble and send RPC */
|
|
struct listen_st rpc_st;
|
|
rpc_st.sockfd = sockfd;
|
|
rpc_st.backlog = backlog;
|
|
#if defined(__linux__)
|
|
rpc_st.__tid = syscall(SYS_gettid);
|
|
#endif
|
|
return rpc_send_command(netpath, RPC_LISTEN, sockfd, &rpc_st, sizeof(struct listen_st));
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
------------------------------------- close() ----------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int fd */
|
|
int close(CLOSE_SIG)
|
|
{
|
|
dwr(MSG_DEBUG, "close(%d)\n", fd);
|
|
set_up_intercept();
|
|
return realclose(fd);
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
-------------------------------- getsockname() ---------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/* int sockfd, struct sockaddr *addr, socklen_t *addrlen */
|
|
int getsockname(GETSOCKNAME_SIG)
|
|
{
|
|
if (!set_up_intercept())
|
|
return realgetsockname(sockfd, addr, addrlen);
|
|
|
|
dwr(MSG_DEBUG,"getsockname(%d)\n", sockfd);
|
|
if(!connected_to_service(sockfd)) {
|
|
dwr(MSG_DEBUG,"getsockname(): not used by service\n");
|
|
return realgetsockname(sockfd, addr, addrlen);
|
|
}
|
|
/* This is kind of a hack as it stands -- assumes sockaddr is sockaddr_in
|
|
* and is an IPv4 address. */
|
|
|
|
/* assemble and send command */
|
|
struct getsockname_st rpc_st;
|
|
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() ---------------------------------
|
|
------------------------------------------------------------------------------*/
|
|
|
|
#if defined(__linux__)
|
|
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);
|
|
}
|
|
#endif |