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ZeroTierOne/netcon/intercept.c
Joseph Henry fe8e7ded8c retval+errno return test
2015-10-09 20:27:38 -04:00

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/*
* 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
/* Name used in err msgs */
char *progname = "";
#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 <stdlib.h>
#include <netinet/in.h>
#include <net/if.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <poll.h>
#include <pthread.h>
#include <unistd.h>
/* For NPs */
#include <sys/stat.h>
#include <sys/ipc.h>
#include <sys/shm.h>
/* for mmap */
#include <sys/mman.h>
#ifdef USE_SOCKS_DNS
#include <resolv.h>
#endif
#include "intercept.h"
#include "common.h"
/* Global Declarations */
#ifdef USE_SOCKS_DNS
static int (*realresinit)(void);
#endif
static int (*realconnect)(CONNECT_SIG);
static int (*realselect)(SELECT_SIG);
static int (*realpoll)(POLL_SIG);
static int (*realbind)(BIND_SIG);
static int (*realaccept)(ACCEPT_SIG);
static int (*reallisten)(LISTEN_SIG);
static int (*realsocket)(SOCKET_SIG);
static int (*realsetsockopt)(SETSOCKOPT_SIG);
static int (*realgetsockopt)(GETSOCKOPT_SIG);
static int (*realaccept4)(ACCEPT4_SIG);
/* Exported Function Prototypes */
void my_init(void);
int connect(CONNECT_SIG);
int select(SELECT_SIG);
int poll(POLL_SIG);
int close(CLOSE_SIG);
int bind(BIND_SIG);
int accept(ACCEPT_SIG);
int listen(LISTEN_SIG);
int socket(SOCKET_SIG);
int setsockopt(SETSOCKOPT_SIG);
int getsockopt(GETSOCKOPT_SIG);
int accept4(ACCEPT4_SIG);
#ifdef USE_SOCKS_DNS
int res_init(void);
#endif
int connect_to_service(void);
int init_service_connection();
void dwr(const char *fmt, ...);
void load_symbols(void);
void set_up_intercept();
int checkpid();
/* defined in unistd.h, but we don't include it because
it conflicts with our overriden symbols for read/write */
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
#define BUF_SZ 1024
#define SERVICE_CONNECT_ATTEMPTS 30
ssize_t sock_fd_read(int sock, void *buf, ssize_t bufsize, int *fd);
/* threading */
pthread_mutex_t lock;
pthread_mutex_t loglock;
/*------------------------------------------------------------------------------
------------------- Intercept<--->Service Comm mechanisms-----------------------
------------------------------------------------------------------------------*/
static int is_initialized = 0;
static int fdret_sock; // used for fd-transfers
static int newfd; // used for "this_end" socket
static char* af_sock_name = "/tmp/.ztnc_e5cd7a9e1c5311ab";
static int thispid;
int checkpid() {
if(thispid != getpid()) {
printf("clone/fork detected. re-initializing this instance.\n");
set_up_intercept();
fdret_sock = init_service_connection();
thispid = getpid();
}
return 0;
}
#define SLEEP_TIME 0
/*------------------------------------------------------------------------------
---------- Unix-domain socket lazy initializer (for fd-transfers)--------------
------------------------------------------------------------------------------*/
/* Sets up the connection pipes and sockets to the service */
int init_service_connection()
{
usleep(SLEEP_TIME);
if(!is_initialized)
{
struct sockaddr_un addr;
int tfd = -1;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, af_sock_name, sizeof(addr.sun_path)-1);
int attempts = 0;
int conn_err = -1;
if ( (tfd = realsocket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket error");
exit(-1);
}
while(conn_err < 0 && attempts < SERVICE_CONNECT_ATTEMPTS)
{
dwr("trying connection (%d): %s\n", tfd, af_sock_name);
conn_err = realconnect(tfd, (struct sockaddr*)&addr, sizeof(addr));
if(conn_err < 0) {
dwr("re-attempting connection in %ds\n", 1+attempts);
sleep(1);
}
else {
dwr("AF_UNIX connection established: %d\n", tfd);
is_initialized = 1;
return tfd;
}
attempts++;
}
}
return -1;
}
/*------------------------------------------------------------------------------
------------------------ ctors and dtors (and friends)-------------------------
------------------------------------------------------------------------------*/
void my_dest(void) __attribute__ ((destructor));
void my_dest(void) {
dwr("closing connections to service...\n");
close(fdret_sock);
pthread_mutex_destroy(&lock);
}
void load_symbols(void)
{
#ifdef USE_OLD_DLSYM
void *lib;
#endif
/* possibly add check to beginning of each method to avoid needing to cll the constructor */
if(thispid == getpid()) {
dwr("detected duplicate call to global ctor (pid=%d).\n", thispid);
}
dwr(" -- pid = %d\n", getpid());
dwr(" -- uid = %d\n", getuid());
thispid = getpid();
#ifndef USE_OLD_DLSYM
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");
realpoll = dlsym(RTLD_NEXT, "poll");
realselect = dlsym(RTLD_NEXT, "select");
realsetsockopt = dlsym(RTLD_NEXT, "setsockopt");
realgetsockopt = dlsym(RTLD_NEXT, "getsockopt");
realaccept4 = dlsym(RTLD_NEXT, "accept4");
#ifdef USE_SOCKS_DNS
realresinit = dlsym(RTLD_NEXT, "res_init");
#endif
#else
lib = dlopen(LIBCONNECT, RTLD_LAZY);
realconnect = dlsym(lib, "connect");
realbind = dlsym(lib, "bind");
realaccept = dlsym(lib, "accept");
reallisten = dlsym(lib, "listen");
realsocket = dlsym(lib, "socket");
realpoll = dlsym(lib, "poll");
realselect = dlsym(lib, "select");
realsetsockopt = dlsym(lib, "setsockopt");
realgetsockopt = dlsym(lib, "getsockopt");
realaccept4 = dlsym(lib), "accept4");
#ifdef USE_SOCKS_DNS
realresinit = dlsym(lib, "res_init");
#endif
dlclose(lib);
lib = dlopen(LIBC, RTLD_LAZY);
dlclose(lib);
#endif
}
/* Private Function Prototypes */
void _init(void) __attribute__ ((constructor));
void _init(void) {
set_up_intercept();
}
/* get symbols and initialize mutexes */
void set_up_intercept()
{
load_symbols();
if(pthread_mutex_init(&lock, NULL) != 0) {
printf("error while initializing service call mutex\n");
}
if(pthread_mutex_init(&loglock, NULL) != 0) {
printf("error while initializing log mutex mutex\n");
}
}
/*------------------------------------------------------------------------------
------------------------- ioctl(), fcntl(), setsockopt()------------------------
------------------------------------------------------------------------------*/
char *cmd_to_str(int cmd)
{
switch(cmd)
{
case F_DUPFD:
return "F_DUPFD";
case F_GETFD:
return "F_GETFD";
case F_SETFD:
return "F_SETFD";
case F_GETFL:
return "F_GETFL";
case F_SETFL:
return "F_SETFL";
case F_GETLK:
return "F_GETLK";
case F_SETLK:
return "F_SETLK";
case F_SETLKW:
return "F_SETLKW";
default:
return "?";
}
return "?";
}
void arg_to_str(int arg)
{
if(arg & O_RDONLY) dwr("O_RDONLY ");
if(arg & O_WRONLY) dwr("O_WRONLY ");
if(arg & O_RDWR) dwr("O_RDWR ");
if(arg & O_CREAT) dwr("O_CREAT ");
if(arg & O_EXCL) dwr("O_EXCL ");
if(arg & O_NOCTTY) dwr("O_NOCTTY ");
if(arg & O_TRUNC) dwr("O_TRUNC ");
if(arg & O_APPEND) dwr("O_APPEND ");
if(arg & O_ASYNC) dwr("O_ASYNC ");
if(arg & O_DIRECT) dwr("O_DIRECT ");
if(arg & O_NOATIME) dwr("O_NOATIME ");
if(arg & O_NONBLOCK) dwr("O_NONBLOCK ");
if(arg & O_DSYNC) dwr("O_DSYNC ");
if(arg & O_SYNC) dwr("O_SYNC ");
}
char* level_to_str(int level)
{
switch(level)
{
case SOL_SOCKET:
return "SOL_SOCKET";
case IPPROTO_TCP:
return "IPPROTO_TCP";
default:
return "?";
}
return "?";
}
char* option_name_to_str(int opt)
{
if(opt == SO_DEBUG) return "SO_DEBUG";
if(opt == SO_BROADCAST) return "SO_BROADCAST";
if(opt == SO_BINDTODEVICE) return "SO_BINDTODEVICE";
if(opt == SO_REUSEADDR) return "SO_REUSEADDR";
if(opt == SO_KEEPALIVE) return "SO_KEEPALIVE";
if(opt == SO_LINGER) return "SO_LINGER";
if(opt == SO_OOBINLINE) return "SO_OOBINLINE";
if(opt == SO_SNDBUF) return "SO_SNDBUF";
if(opt == SO_RCVBUF) return "SO_RCVBUF";
if(opt == SO_DONTROUTE) return "SO_DONTROUTEO_ASYNC";
if(opt == SO_RCVLOWAT) return "SO_RCVLOWAT";
if(opt == SO_RCVTIMEO) return "SO_RCVTIMEO";
if(opt == SO_SNDLOWAT) return "SO_SNDLOWAT";
if(opt == SO_SNDTIMEO)return "SO_SNDTIMEO";
return "?";
}
/*------------------------------------------------------------------------------
--------------------------------- setsockopt() ---------------------------------
------------------------------------------------------------------------------*/
/* int socket, int level, int option_name, const void *option_value, socklen_t option_len */
int setsockopt(SETSOCKOPT_SIG)
{
#ifdef DUMMY
dwr("setsockopt(%d)\n", socket);
return realsetsockopt(socket, level, option_name, option_value, option_len);
#else
/* make sure we don't touch any standard outputs */
if(socket == STDIN_FILENO || socket == STDOUT_FILENO || socket == STDERR_FILENO)
return(realsetsockopt(socket, level, option_name, option_value, option_len));
int err = realsetsockopt(socket, level, option_name, option_value, option_len);
if(err < 0){
//perror("setsockopt():\n");
}
return 0;
#endif
}
/*------------------------------------------------------------------------------
--------------------------------- getsockopt() ---------------------------------
------------------------------------------------------------------------------*/
/* int sockfd, int level, int optname, void *optval, socklen_t *optlen */
int getsockopt(GETSOCKOPT_SIG)
{
#ifdef DUMMY
dwr("getsockopt(%d)\n", sockfd);
return realgetsockopt(sockfd, level, optname, optval, optlen);
#else
// make sure we don't touch any standard outputs
int err = realgetsockopt(sockfd, level, optname, optval, optlen);
// FIXME: this condition will need a little more intelligence later on
// -- we will need to know if this fd is a local we are spoofing, or a true local
if(optname == SO_TYPE)
{
int* val = (int*)optval;
*val = 2;
optval = (void*)val;
}
if(err < 0){
//perror("setsockopt():\n");
}
return 0;
#endif
}
/*------------------------------------------------------------------------------
---------------------------------- shutdown() ----------------------------------
------------------------------------------------------------------------------*/
void shutdown_arg_to_str(int arg)
{
if(arg & O_RDONLY) dwr("O_RDONLY ");
if(arg & O_WRONLY) dwr("O_WRONLY ");
if(arg & O_RDWR) dwr("O_RDWR ");
if(arg & O_CREAT) dwr("O_CREAT ");
if(arg & O_EXCL) dwr("O_EXCL ");
if(arg & O_NOCTTY) dwr("O_NOCTTY ");
if(arg & O_TRUNC) dwr("O_TRUNC ");
if(arg & O_APPEND) dwr("O_APPEND ");
if(arg & O_ASYNC) dwr("O_ASYNC ");
if(arg & O_DIRECT) dwr("O_DIRECT ");
if(arg & O_NOATIME) dwr("O_NOATIME ");
if(arg & O_NONBLOCK) dwr("O_NONBLOCK ");
if(arg & O_DSYNC) dwr("O_DSYNC ");
if(arg & O_SYNC) dwr("O_SYNC ");
}
/*------------------------------------------------------------------------------
----------------------------------- socket() -----------------------------------
------------------------------------------------------------------------------*/
void sock_type_to_str(int arg)
{
if(arg == SOCK_STREAM) printf("SOCK_STREAM ");
if(arg == SOCK_DGRAM) printf("SOCK_DGRAM ");
if(arg == SOCK_SEQPACKET) printf("SOCK_SEQPACKET ");
if(arg == SOCK_RAW) printf("SOCK_RAW ");
if(arg == SOCK_RDM) printf("SOCK_RDM ");
if(arg == SOCK_PACKET) printf("SOCK_PACKET ");
if(arg & SOCK_NONBLOCK) printf("| SOCK_NONBLOCK ");
if(arg & SOCK_CLOEXEC) printf("| SOCK_CLOEXEC ");
}
void sock_domain_to_str(int domain)
{
if(domain == AF_UNIX) printf("AF_UNIX ");
if(domain == AF_LOCAL) printf("AF_LOCAL ");
if(domain == AF_INET) printf("AF_INET ");
if(domain == AF_INET6) printf("AF_INET6 ");
if(domain == AF_IPX) printf("AF_IPX ");
if(domain == AF_NETLINK) printf("AF_NETLINK ");
if(domain == AF_X25) printf("AF_X25 ");
if(domain == AF_AX25) printf("AF_AX25 ");
if(domain == AF_ATMPVC) printf("AF_ATMPVC ");
if(domain == AF_APPLETALK) printf("AF_APPLETALK ");
if(domain == AF_PACKET) printf("AF_PACKET ");
}
/* int socket_family, int socket_type, int protocol
socket() intercept function */
int socket(SOCKET_SIG)
{
#ifdef DUMMY
dwr("socket(fam=%d, type=%d, prot=%d)\n", socket_family, socket_type, protocol);
//usleep(DUMMY_WAIT);
return realsocket(socket_family, socket_type, protocol);
#else
char cmd[BUF_SZ];
fdret_sock = !is_initialized ? init_service_connection() : fdret_sock;
if(socket_family == AF_LOCAL
|| socket_family == AF_NETLINK
|| socket_family == AF_UNIX) {
int err = realsocket(socket_family, socket_type, protocol);
return err;
}
/* Assemble and route command */
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);
memset(cmd, '\0', BUF_SZ);
cmd[0] = RPC_SOCKET;
memcpy(&cmd[1], &rpc_st, sizeof(struct socket_st));
pthread_mutex_lock(&lock);
write(fdret_sock,cmd, BUF_SZ);
/* get new fd */
char gmybuf[16];
ssize_t size = sock_fd_read(fdret_sock, gmybuf, sizeof(gmybuf), &newfd);
if(size > 0)
{
dwr("socket(): RXed FD = %d\n", newfd);
/* send our local-fd number back to service so
it can complete its mapping table entry */
memset(cmd, '\0', BUF_SZ);
cmd[0] = RPC_FD_MAP_COMPLETION;
memcpy(&cmd[1], &newfd, sizeof(newfd));
write(fdret_sock, cmd, BUF_SZ);
pthread_mutex_unlock(&lock);
return newfd;
}
else {
dwr("Error while receiving new FD.\n");
pthread_mutex_unlock(&lock);
return -1;
}
return realsocket(socket_family, socket_type, protocol);
#endif
}
/*------------------------------------------------------------------------------
---------------------------------- connect() -----------------------------------
------------------------------------------------------------------------------*/
/* int __fd, const struct sockaddr * __addr, socklen_t __len
connect() intercept function */
int connect(CONNECT_SIG)
{
#ifdef DUMMY
dwr("connect(%d)\n", __fd);
return realconnect(__fd, __addr, __len);
#else
/* make sure we don't touch any standard outputs */
if(__fd == STDIN_FILENO || __fd == STDOUT_FILENO || __fd == STDERR_FILENO)
return(realconnect(__fd, __addr, __len));
int sock_type = -1;
socklen_t sock_type_len = sizeof(sock_type);
struct sockaddr_in *connaddr;
connaddr = (struct sockaddr_in *) __addr;
getsockopt(__fd, SOL_SOCKET, SO_TYPE,
(void *) &sock_type, &sock_type_len);
if(__addr != NULL && (connaddr->sin_family == AF_LOCAL
|| connaddr->sin_family == PF_NETLINK
|| connaddr->sin_family == AF_NETLINK
|| connaddr->sin_family == AF_UNIX)) {
int err = realconnect(__fd, __addr, __len);
return err;
}
char cmd[BUF_SZ];
if (realconnect == NULL) {
dwr("Unresolved symbol: connect()\n");
return -1;
}
/* assemble and route command */
memset(cmd, '\0', BUF_SZ);
struct connect_st rpc_st;
rpc_st.__tid = syscall(SYS_gettid);
rpc_st.__fd = __fd;
memcpy(&rpc_st.__addr, __addr, sizeof(struct sockaddr));
memcpy(&rpc_st.__len, &__len, sizeof(socklen_t));
cmd[0] = RPC_CONNECT;
memcpy(&cmd[1], &rpc_st, sizeof(struct connect_st));
pthread_mutex_lock(&lock);
write(fdret_sock,cmd, BUF_SZ);
if(fdret_sock >= 0) {
int retval;
char mynewbuf[BUF_SZ];
memset(&mynewbuf, '\0', sizeof(mynewbuf));
int n_read = read(fdret_sock, &mynewbuf, sizeof(mynewbuf));
if(n_read > 0) {
memcpy(&retval, &mynewbuf[1], sizeof(int));
pthread_mutex_unlock(&lock);
return retval;
}
else {
pthread_mutex_unlock(&lock);
dwr("unable to read connect: return value\n");
}
}
return -1;
#endif
}
/*------------------------------------------------------------------------------
---------------------------------- select() ------------------------------------
------------------------------------------------------------------------------*/
/* int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout */
int select(SELECT_SIG)
{
#ifdef DUMMY
dwr("select(n=%d, <readfds>, <writefds>, <exceptfds>, <timeout>)\n", n);
return realselect(n, readfds, writefds, exceptfds, timeout);
#else
return realselect(n, readfds, writefds, exceptfds, timeout);
#endif
}
/*------------------------------------------------------------------------------
----------------------------------- poll() -------------------------------------
------------------------------------------------------------------------------*/
/* struct pollfd *__fds, nfds_t __nfds, int __timeout */
int poll(POLL_SIG)
{
#ifdef DUMMY
dwr("poll(<ufds>, nfds=%d, timeout=%d)\n", __fds, __timeout);
return realpoll(__fds, __nfds, __timeout);
#else
return realpoll(__fds, __nfds, __timeout);
#endif
}
/*------------------------------------------------------------------------------
------------------------------------ bind() ------------------------------------
------------------------------------------------------------------------------*/
/* int sockfd, const struct sockaddr *addr, socklen_t addrlen
bind() intercept function */
int bind(BIND_SIG)
{
#ifdef DUMMY
dwr("bind(%d)\n", sockfd);
return realbind(sockfd, addr, addrlen);
#else
/* make sure we don't touch any standard outputs */
if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
return(realbind(sockfd, addr, addrlen));
int sock_type = -1;
socklen_t sock_type_len = sizeof(sock_type);
struct sockaddr_in *connaddr;
connaddr = (struct sockaddr_in *) addr;
getsockopt(sockfd, SOL_SOCKET, SO_TYPE,
(void *) &sock_type, &sock_type_len);
if (addr != NULL && (connaddr->sin_family == AF_LOCAL
|| connaddr->sin_family == PF_NETLINK
|| connaddr->sin_family == AF_NETLINK
|| connaddr->sin_family == AF_UNIX)) {
return(realbind(sockfd, addr, addrlen));
}
char cmd[BUF_SZ];
if(realbind == NULL) {
dwr("Unresolved symbol: bind()\n");
return -1;
}
/* Assemble and route command */
struct bind_st rpc_st;
rpc_st.sockfd = sockfd;
rpc_st.__tid = syscall(SYS_gettid);
memcpy(&rpc_st.addr, addr, sizeof(struct sockaddr));
memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t));
cmd[0]=RPC_BIND;
memcpy(&cmd[1], &rpc_st, sizeof(struct bind_st));
pthread_mutex_lock(&lock);
write(fdret_sock, cmd, BUF_SZ);
pthread_mutex_unlock(&lock);
/*
If we successfully wrote the RPC, try to read a return value
- Also get errno value
*/
if(fdret_sock >= 0) {
int retval;
int _errno;
char mynewbuf[BUF_SZ];
memset(&mynewbuf, '\0', sizeof(mynewbuf));
int n_read = read(fdret_sock, &mynewbuf, sizeof(mynewbuf));
if(n_read > 0) {
memcpy(&retval, &mynewbuf[1], sizeof(retval));
memcpy(&_errno, &mynewbuf[1]+sizeof(retval), sizeof(_errno));
dwr("errno = %d\n", _errno);
errno = _errno;
pthread_mutex_unlock(&lock);
return retval;
}
else {
pthread_mutex_unlock(&lock);
dwr("unable to read connect: return value\n");
}
}
return 0; /* FIXME: get real return value */
#endif
}
/*------------------------------------------------------------------------------
----------------------------------- accept4() ----------------------------------
------------------------------------------------------------------------------*/
/* int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags */
int accept4(ACCEPT4_SIG)
{
#ifdef DUMMY
dwr("accept4(%d)\n", sockfd);
return accept(sockfd, addr, addrlen);
#else
return accept(sockfd, addr, addrlen);
#endif
}
/*------------------------------------------------------------------------------
----------------------------------- accept() -----------------------------------
------------------------------------------------------------------------------*/
/* int sockfd struct sockaddr *addr, socklen_t *addrlen
accept() intercept function */
int accept(ACCEPT_SIG)
{
#ifdef DUMMY
return realaccept(sockfd, addr, addrlen);
#else
/* make sure we don't touch any standard outputs */
if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
return(realaccept(sockfd, addr, addrlen));
int sock_type = -1;
socklen_t sock_type_len = sizeof(sock_type);
getsockopt(sockfd, SOL_SOCKET, SO_TYPE,
(void *) &sock_type, &sock_type_len);
addr->sa_family = AF_INET;
/* TODO: also get address info */
char cmd[BUF_SZ];
if(realaccept == NULL) {
dwr( "Unresolved symbol: accept()\n");
return -1;
}
char gmybuf[16];
int new_conn_socket;
char c[1];
int n = read(sockfd, c, sizeof(c));
if(n > 0)
{
ssize_t size = sock_fd_read(fdret_sock, gmybuf, sizeof(gmybuf), &new_conn_socket);
if(size > 0)
{
dwr("accept(): RXed FD = %d\n", new_conn_socket);
/* Send our local-fd number back to service so it can complete its mapping table */
memset(cmd, '\0', BUF_SZ);
cmd[0] = RPC_FD_MAP_COMPLETION;
memcpy(&cmd[1], &new_conn_socket, sizeof(new_conn_socket));
pthread_mutex_lock(&lock);
write(fdret_sock, cmd, BUF_SZ);
pthread_mutex_unlock(&lock);
return new_conn_socket;
}
else {
dwr("Error while receiving new FD.\n");
return -1;
}
}
errno = EWOULDBLOCK;
return -1;
/* TODO/FIXME: Set errno */
#endif
}
/*------------------------------------------------------------------------------
------------------------------------- listen()----------------------------------
------------------------------------------------------------------------------*/
/* int sockfd, int backlog
listen() intercept function */
int listen(LISTEN_SIG)
{
#ifdef DUMMY
dwr("listen(%d)\n", sockfd);
return reallisten(sockfd, backlog);
#else
/* make sure we don't touch any standard outputs */
if(sockfd == STDIN_FILENO || sockfd == STDOUT_FILENO || sockfd == STDERR_FILENO)
return(reallisten(sockfd, backlog));
char cmd[BUF_SZ];
dwr("listen(%d)\n", sockfd);
/* Assemble and route command */
memset(cmd, '\0', BUF_SZ);
struct listen_st rpc_st;
rpc_st.sockfd = sockfd;
rpc_st.backlog = backlog;
rpc_st.__tid = syscall(SYS_gettid);
cmd[0] = RPC_LISTEN;
memcpy(&cmd[1], &rpc_st, sizeof(struct listen_st));
pthread_mutex_lock(&lock);
write(fdret_sock,cmd, BUF_SZ);
pthread_mutex_unlock(&lock);
return 0;
/* FIXME: get real return value (should be 0 / -1) */
/* FIXME: Also set errno */
#endif
}
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