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TP-Link_Archer-XR500v/BBA1.5_platform/host_tools/fakeroot/communicate.c
Matheus Sampaio Queiroga aaca98136a
Add gpl
2024-07-22 01:58:46 -03:00

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21 KiB
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/*
copyright : GPL
(author: joost witteveen, joostje@debian.org)
This file contains the code (wrapper functions) that gets linked with
the programes run from inside fakeroot. These programes then communicate
with the fakeroot daemon, that keeps information about the "fake"
ownerships etc. of the files etc.
*/
#include "communicate.h"
#include <dlfcn.h>
#include <stdio.h>
#ifndef FAKEROOT_FAKENET
# include <sys/ipc.h>
# include <sys/msg.h>
# include <sys/sem.h>
#else /* FAKEROOT_FAKENET */
# include <netinet/in.h>
# include <netinet/tcp.h>
# include <netdb.h>
# include <pthread.h>
# ifdef HAVE_ENDIAN_H
# include <endian.h>
# endif
#endif /* FAKEROOT_FAKENET */
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef STUPID_ALPHA_HACK
#include "stats.h"
#endif
#ifndef _UTSNAME_LENGTH
/* for LINUX libc5 */
# define _UTSNAME_LENGTH _SYS_NMLN
#endif
#ifndef FAKEROOT_FAKENET
int msg_snd=-1;
int msg_get=-1;
int sem_id=-1;
#else /* FAKEROOT_FAKENET */
volatile int comm_sd = -1;
static pthread_mutex_t comm_sd_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif /* FAKEROOT_FAKENET */
#ifdef FAKEROOT_FAKENET
static void fail(const char *msg)
{
if (errno > 0)
fprintf(stderr, "libfakeroot: %s: %s\n", msg, strerror(errno));
else
fprintf(stderr, "libfakeroot: %s\n", msg);
exit(1);
}
#endif /* FAKEROOT_FAKENET */
const char *env_var_set(const char *env){
const char *s;
s=getenv(env);
if(s && *s)
return s;
else
return NULL;
}
void cpyfakemstat(struct fake_msg *f, const struct stat *st
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
#ifndef STUPID_ALPHA_HACK
f->st.mode =st->st_mode;
f->st.ino =st->st_ino ;
f->st.uid =st->st_uid ;
f->st.gid =st->st_gid ;
f->st.dev =st->st_dev ;
f->st.rdev =st->st_rdev;
/* DO copy the nlink count. Although the system knows this
one better, we need it for unlink().
This actually opens up a race condition, if another command
makes a hardlink on a file, while we try to unlink it. This
may cause the record to be deleted, while the link continues
to live on the disk. But the chance is small, and unlikely
to occur in practical fakeroot conditions. */
f->st.nlink=st->st_nlink;
#else
switch(ver) {
case _STAT_VER_KERNEL:
f->st.mode = ((struct fakeroot_kernel_stat *)st)->st_mode;
f->st.ino = ((struct fakeroot_kernel_stat *)st)->st_ino;
f->st.uid = ((struct fakeroot_kernel_stat *)st)->st_uid;
f->st.gid = ((struct fakeroot_kernel_stat *)st)->st_gid;
f->st.dev = ((struct fakeroot_kernel_stat *)st)->st_dev;
f->st.rdev = ((struct fakeroot_kernel_stat *)st)->st_rdev;
f->st.nlink = ((struct fakeroot_kernel_stat *)st)->st_nlink;
break;
case _STAT_VER_GLIBC2:
f->st.mode = ((struct fakeroot_glibc2_stat *)st)->st_mode;
f->st.ino = ((struct fakeroot_glibc2_stat *)st)->st_ino;
f->st.uid = ((struct fakeroot_glibc2_stat *)st)->st_uid;
f->st.gid = ((struct fakeroot_glibc2_stat *)st)->st_gid;
f->st.dev = ((struct fakeroot_glibc2_stat *)st)->st_dev;
f->st.rdev = ((struct fakeroot_glibc2_stat *)st)->st_rdev;
f->st.nlink = ((struct fakeroot_glibc2_stat *)st)->st_nlink;
break;
case _STAT_VER_GLIBC2_1:
f->st.mode = ((struct fakeroot_glibc21_stat *)st)->st_mode;
f->st.ino = ((struct fakeroot_glibc21_stat *)st)->st_ino;
f->st.uid = ((struct fakeroot_glibc21_stat *)st)->st_uid;
f->st.gid = ((struct fakeroot_glibc21_stat *)st)->st_gid;
f->st.dev = ((struct fakeroot_glibc21_stat *)st)->st_dev;
f->st.rdev = ((struct fakeroot_glibc21_stat *)st)->st_rdev;
f->st.nlink = ((struct fakeroot_glibc21_stat *)st)->st_nlink;
break;
default:
f->st.mode = st->st_mode;
f->st.ino = st->st_ino;
f->st.uid = st->st_uid;
f->st.gid = st->st_gid;
f->st.dev = st->st_dev;
f->st.rdev = st->st_rdev;
f->st.nlink = st->st_nlink;
break;
}
#endif
}
void cpystatfakem(struct stat *st, const struct fake_msg *f
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
#ifndef STUPID_ALPHA_HACK
st->st_mode =f->st.mode;
st->st_ino =f->st.ino ;
st->st_uid =f->st.uid ;
st->st_gid =f->st.gid ;
st->st_dev =f->st.dev ;
st->st_rdev =f->st.rdev;
/* DON'T copy the nlink count! The system always knows
this one better! */
/* st->st_nlink=f->st.nlink;*/
#else
switch(ver) {
case _STAT_VER_KERNEL:
((struct fakeroot_kernel_stat *)st)->st_mode = f->st.mode;
((struct fakeroot_kernel_stat *)st)->st_ino = f->st.ino;
((struct fakeroot_kernel_stat *)st)->st_uid = f->st.uid;
((struct fakeroot_kernel_stat *)st)->st_gid = f->st.gid;
((struct fakeroot_kernel_stat *)st)->st_dev = f->st.dev;
((struct fakeroot_kernel_stat *)st)->st_rdev = f->st.rdev;
break;
case _STAT_VER_GLIBC2:
((struct fakeroot_glibc2_stat *)st)->st_mode = f->st.mode;
((struct fakeroot_glibc2_stat *)st)->st_ino = f->st.ino;
((struct fakeroot_glibc2_stat *)st)->st_uid = f->st.uid;
((struct fakeroot_glibc2_stat *)st)->st_gid = f->st.gid;
((struct fakeroot_glibc2_stat *)st)->st_dev = f->st.dev;
((struct fakeroot_glibc2_stat *)st)->st_rdev = f->st.rdev;
break;
case _STAT_VER_GLIBC2_1:
((struct fakeroot_glibc21_stat *)st)->st_mode = f->st.mode;
((struct fakeroot_glibc21_stat *)st)->st_ino = f->st.ino;
((struct fakeroot_glibc21_stat *)st)->st_uid = f->st.uid;
((struct fakeroot_glibc21_stat *)st)->st_gid = f->st.gid;
((struct fakeroot_glibc21_stat *)st)->st_dev = f->st.dev;
((struct fakeroot_glibc21_stat *)st)->st_rdev = f->st.rdev;
break;
default:
st->st_mode =f->st.mode;
st->st_ino =f->st.ino ;
st->st_uid =f->st.uid ;
st->st_gid =f->st.gid ;
st->st_dev =f->st.dev ;
st->st_rdev =f->st.rdev;
break;
}
#endif
}
#ifdef STAT64_SUPPORT
void cpyfakemstat64(struct fake_msg *f,
const struct stat64 *st
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
#ifndef STUPID_ALPHA_HACK
f->st.mode =st->st_mode;
f->st.ino =st->st_ino ;
f->st.uid =st->st_uid ;
f->st.gid =st->st_gid ;
f->st.dev =st->st_dev ;
f->st.rdev =st->st_rdev;
/* DO copy the nlink count. Although the system knows this
one better, we need it for unlink().
This actually opens up a race condition, if another command
makes a hardlink on a file, while we try to unlink it. This
may cause the record to be deleted, while the link continues
to live on the disk. But the chance is small, and unlikely
to occur in practical fakeroot conditions. */
f->st.nlink=st->st_nlink;
#else
switch(ver) {
case _STAT_VER_KERNEL:
f->st.mode = ((struct fakeroot_kernel_stat *)st)->st_mode;
f->st.ino = ((struct fakeroot_kernel_stat *)st)->st_ino;
f->st.uid = ((struct fakeroot_kernel_stat *)st)->st_uid;
f->st.gid = ((struct fakeroot_kernel_stat *)st)->st_gid;
f->st.dev = ((struct fakeroot_kernel_stat *)st)->st_dev;
f->st.rdev = ((struct fakeroot_kernel_stat *)st)->st_rdev;
f->st.nlink = ((struct fakeroot_kernel_stat *)st)->st_nlink;
break;
case _STAT_VER_GLIBC2:
f->st.mode = ((struct fakeroot_glibc2_stat *)st)->st_mode;
f->st.ino = ((struct fakeroot_glibc2_stat *)st)->st_ino;
f->st.uid = ((struct fakeroot_glibc2_stat *)st)->st_uid;
f->st.gid = ((struct fakeroot_glibc2_stat *)st)->st_gid;
f->st.dev = ((struct fakeroot_glibc2_stat *)st)->st_dev;
f->st.rdev = ((struct fakeroot_glibc2_stat *)st)->st_rdev;
f->st.nlink = ((struct fakeroot_glibc2_stat *)st)->st_nlink;
break;
case _STAT_VER_GLIBC2_1:
f->st.mode = ((struct fakeroot_glibc21_stat *)st)->st_mode;
f->st.ino = ((struct fakeroot_glibc21_stat *)st)->st_ino;
f->st.uid = ((struct fakeroot_glibc21_stat *)st)->st_uid;
f->st.gid = ((struct fakeroot_glibc21_stat *)st)->st_gid;
f->st.dev = ((struct fakeroot_glibc21_stat *)st)->st_dev;
f->st.rdev = ((struct fakeroot_glibc21_stat *)st)->st_rdev;
f->st.nlink = ((struct fakeroot_glibc21_stat *)st)->st_nlink;
break;
default:
f->st.mode = st->st_mode;
f->st.ino = st->st_ino;
f->st.uid = st->st_uid;
f->st.gid = st->st_gid;
f->st.dev = st->st_dev;
f->st.rdev = st->st_rdev;
f->st.nlink = st->st_nlink;
break;
}
#endif
}
void cpystat64fakem(struct stat64 *st,
const struct fake_msg *f
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
#ifndef STUPID_ALPHA_HACK
st->st_mode =f->st.mode;
st->st_ino =f->st.ino ;
st->st_uid =f->st.uid ;
st->st_gid =f->st.gid ;
st->st_dev =f->st.dev ;
st->st_rdev =f->st.rdev;
/* DON'T copy the nlink count! The system always knows
this one better! */
/* st->st_nlink=f->st.nlink;*/
#else
switch(ver) {
case _STAT_VER_KERNEL:
((struct fakeroot_kernel_stat *)st)->st_mode = f->st.mode;
((struct fakeroot_kernel_stat *)st)->st_ino = f->st.ino;
((struct fakeroot_kernel_stat *)st)->st_uid = f->st.uid;
((struct fakeroot_kernel_stat *)st)->st_gid = f->st.gid;
((struct fakeroot_kernel_stat *)st)->st_dev = f->st.dev;
((struct fakeroot_kernel_stat *)st)->st_rdev = f->st.rdev;
break;
case _STAT_VER_GLIBC2:
((struct fakeroot_glibc2_stat *)st)->st_mode = f->st.mode;
((struct fakeroot_glibc2_stat *)st)->st_ino = f->st.ino;
((struct fakeroot_glibc2_stat *)st)->st_uid = f->st.uid;
((struct fakeroot_glibc2_stat *)st)->st_gid = f->st.gid;
((struct fakeroot_glibc2_stat *)st)->st_dev = f->st.dev;
((struct fakeroot_glibc2_stat *)st)->st_rdev = f->st.rdev;
break;
case _STAT_VER_GLIBC2_1:
((struct fakeroot_glibc21_stat *)st)->st_mode = f->st.mode;
((struct fakeroot_glibc21_stat *)st)->st_ino = f->st.ino;
((struct fakeroot_glibc21_stat *)st)->st_uid = f->st.uid;
((struct fakeroot_glibc21_stat *)st)->st_gid = f->st.gid;
((struct fakeroot_glibc21_stat *)st)->st_dev = f->st.dev;
((struct fakeroot_glibc21_stat *)st)->st_rdev = f->st.rdev;
break;
default:
st->st_mode =f->st.mode;
st->st_ino =f->st.ino ;
st->st_uid =f->st.uid ;
st->st_gid =f->st.gid ;
st->st_dev =f->st.dev ;
st->st_rdev =f->st.rdev;
break;
}
#endif
}
#endif /* STAT64_SUPPORT */
void cpyfakefake(struct fakestat *dest,
const struct fakestat *source){
dest->mode =source->mode;
dest->ino =source->ino ;
dest->uid =source->uid ;
dest->gid =source->gid ;
dest->dev =source->dev ;
dest->rdev =source->rdev;
/* DON'T copy the nlink count! The system always knows
this one better! */
/* dest->nlink=source->nlink;*/
}
#ifdef _LARGEFILE_SOURCE
void stat64from32(struct stat64 *s64, const struct stat *s32)
{
/* I've added st_size and st_blocks here.
Don't know why they were missing -- joost*/
s64->st_dev = s32->st_dev;
s64->st_ino = s32->st_ino;
s64->st_mode = s32->st_mode;
s64->st_nlink = s32->st_nlink;
s64->st_uid = s32->st_uid;
s64->st_gid = s32->st_gid;
s64->st_rdev = s32->st_rdev;
s64->st_size = s32->st_size;
s64->st_blksize = s32->st_blksize;
s64->st_blocks = s32->st_blocks;
s64->st_atime = s32->st_atime;
s64->st_mtime = s32->st_mtime;
s64->st_ctime = s32->st_ctime;
}
/* This assumes that the 64 bit structure is actually filled in and does not
down case the sizes from the 32 bit one.. */
void stat32from64(struct stat *s32, const struct stat64 *s64)
{
s32->st_dev = s64->st_dev;
s32->st_ino = s64->st_ino;
s32->st_mode = s64->st_mode;
s32->st_nlink = s64->st_nlink;
s32->st_uid = s64->st_uid;
s32->st_gid = s64->st_gid;
s32->st_rdev = s64->st_rdev;
s32->st_size = (long)s64->st_size;
s32->st_blksize = s64->st_blksize;
s32->st_blocks = (long)s64->st_blocks;
s32->st_atime = s64->st_atime;
s32->st_mtime = s64->st_mtime;
s32->st_ctime = s64->st_ctime;
}
#endif
#ifndef FAKEROOT_FAKENET
void semaphore_up(){
struct sembuf op;
if(sem_id==-1)
sem_id=semget(get_ipc_key(0)+2,1,IPC_CREAT|0600);
op.sem_num=0;
op.sem_op=-1;
op.sem_flg=SEM_UNDO;
init_get_msg();
while (1) {
if (semop(sem_id,&op,1)) {
if (errno != EINTR) {
perror("semop(1): encountered an error");
exit(1);
}
} else {
break;
}
}
}
void semaphore_down(){
struct sembuf op;
if(sem_id==-1)
sem_id=semget(get_ipc_key(0)+2,1,IPC_CREAT|0600);
op.sem_num=0;
op.sem_op=1;
op.sem_flg=SEM_UNDO;
while (1) {
if (semop(sem_id,&op,1)) {
if (errno != EINTR) {
perror("semop(2): encountered an error");
exit(1);
}
} else {
break;
}
}
}
#else /* FAKEROOT_FAKENET */
static struct sockaddr *get_addr(void)
{
static struct sockaddr_in addr = { 0, 0, { 0 } };
if (!addr.sin_port) {
char *str;
int port;
str = (char *) env_var_set(FAKEROOTKEY_ENV);
if (!str) {
errno = 0;
fail("FAKEROOTKEY not defined in environment");
}
port = atoi(str);
if (port <= 0 || port >= 65536) {
errno = 0;
fail("invalid port number in FAKEROOTKEY");
}
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(port);
}
return (struct sockaddr *) &addr;
}
static void open_comm_sd(void)
{
if (comm_sd >= 0)
return;
comm_sd = socket(PF_INET, SOCK_STREAM, 0);
if (comm_sd < 0)
fail("socket");
if (fcntl(comm_sd, F_SETFD, FD_CLOEXEC) < 0)
fail("fcntl(F_SETFD, FD_CLOEXEC)");
if (connect(comm_sd, get_addr(), sizeof (struct sockaddr_in)) < 0)
fail("connect");
}
void lock_comm_sd(void)
{
pthread_mutex_lock(&comm_sd_mutex);
}
void unlock_comm_sd(void)
{
pthread_mutex_unlock(&comm_sd_mutex);
}
#endif /* FAKEROOT_FAKENET */
#ifndef FAKEROOT_FAKENET
void send_fakem(const struct fake_msg *buf)
{
int r;
if(init_get_msg()!=-1){
((struct fake_msg *)buf)->mtype=1;
r=msgsnd(msg_snd, (struct fake_msg *)buf,
sizeof(*buf)-sizeof(buf->mtype), 0);
if(r==-1)
perror("libfakeroot, when sending message");
}
}
void send_get_fakem(struct fake_msg *buf)
{
/*
send and get a struct fakestat from the daemon.
We have to use serial/pid numbers in addidtion to
the semaphore locking, to prevent the following:
Client 1 locks and sends a stat() request to deamon.
meantime, client 2 tries to up the semaphore too, but blocks.
While client 1 is waiting, it recieves a KILL signal, and dies.
SysV semaphores can eighter be automatically cleaned up when
a client dies, or they can stay in place. We have to use the
cleanup version, as otherwise client 2 will block forever.
So, the semaphore is cleaned up when client 1 recieves the KILL signal.
Now, client 1 falls through the semaphore_up, and
sends a stat() request to the daemon -- it will now recieve
the answer intended for client 1, and hell breaks lose (yes,
this has actually happened, and yes, it was hell (to debug)).
I realise that I may well do away with the semaphore stuff,
if I put the serial/pid numbers in the mtype field. But I cannot
store both PID and serial in mtype (just 32 bits on Linux). So
there will always be some (small) chance it will go wrong.
*/
int l;
pid_t pid;
static int serial=0;
if(init_get_msg()!=-1){
pid=getpid();
serial++;
buf->serial=serial;
semaphore_up();
buf->pid=pid;
send_fakem(buf);
do
l=msgrcv(msg_get,
(struct my_msgbuf*)buf,
sizeof(*buf)-sizeof(buf->mtype),0,0);
while((buf->serial!=serial)||buf->pid!=pid);
semaphore_down();
/*
(nah, may be wrong, due to allignment)
if(l!=sizeof(*buf)-sizeof(buf->mtype))
printf("libfakeroot/fakeroot, internal bug!! get_fake: length=%i != l=%i",
sizeof(*buf)-sizeof(buf->mtype),l);
*/
}
}
#else /* FAKEROOT_FAKENET */
static size_t write_all(int fd,const void*buf,size_t count) {
ssize_t rc,remaining=count;
while(remaining>0) {
rc= write(fd, buf+(count-remaining), remaining);
if(rc<=0) {
if(remaining==count) return rc;
else fail("partial write");
} else {
remaining-=rc;
}
}
return count-remaining;
}
static size_t read_all(int fd,void *buf,size_t count) {
ssize_t rc,remaining=count;
while(remaining>0) {
rc = read(fd,buf+(count-remaining),remaining);
if(rc<=0) {
if(remaining==count) return rc;
else fail("partial read");
} else {
remaining-=rc;
}
}
return count-remaining;
}
static void send_fakem_nr(const struct fake_msg *buf)
{
struct fake_msg fm;
fm.id = htonl(buf->id);
fm.st.uid = htonl(buf->st.uid);
fm.st.gid = htonl(buf->st.gid);
fm.st.ino = htonll(buf->st.ino);
fm.st.dev = htonll(buf->st.dev);
fm.st.rdev = htonll(buf->st.rdev);
fm.st.mode = htonl(buf->st.mode);
fm.st.nlink = htonl(buf->st.nlink);
fm.remote = htonl(0);
while (1) {
ssize_t len;
len = write_all(comm_sd, &fm, sizeof (fm));
if (len > 0)
break;
if (len == 0) {
errno = 0;
fail("write: socket is closed");
}
if (errno == EINTR)
continue;
fail("write");
}
}
void send_fakem(const struct fake_msg *buf)
{
lock_comm_sd();
open_comm_sd();
send_fakem_nr(buf);
unlock_comm_sd();
}
static void get_fakem_nr(struct fake_msg *buf)
{
while (1) {
ssize_t len;
len = read_all(comm_sd, buf, sizeof (struct fake_msg));
if (len > 0)
break;
if (len == 0) {
errno = 0;
fail("read: socket is closed");
}
if (errno == EINTR)
continue;
fail("read");
}
buf->id = ntohl(buf->id);
buf->st.uid = ntohl(buf->st.uid);
buf->st.gid = ntohl(buf->st.gid);
buf->st.ino = ntohll(buf->st.ino);
buf->st.dev = ntohll(buf->st.dev);
buf->st.rdev = ntohll(buf->st.rdev);
buf->st.mode = ntohl(buf->st.mode);
buf->st.nlink = ntohl(buf->st.nlink);
buf->remote = ntohl(buf->remote);
}
void send_get_fakem(struct fake_msg *buf)
{
lock_comm_sd();
open_comm_sd();
send_fakem_nr(buf);
get_fakem_nr(buf);
unlock_comm_sd();
}
#endif /* FAKEROOT_FAKENET */
void send_stat(const struct stat *st,
func_id_t f
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
struct fake_msg buf;
#ifndef FAKEROOT_FAKENET
if(init_get_msg()!=-1)
#endif /* ! FAKEROOT_FAKENET */
{
#ifndef STUPID_ALPHA_HACK
cpyfakemstat(&buf,st);
#else
cpyfakemstat(&buf,st,ver);
#endif
buf.id=f;
send_fakem(&buf);
}
}
#ifdef STAT64_SUPPORT
void send_stat64(const struct stat64 *st,
func_id_t f
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
struct fake_msg buf;
#ifndef FAKEROOT_FAKENET
if(init_get_msg()!=-1)
#endif /* ! FAKEROOT_FAKENET */
{
#ifndef STUPID_ALPHA_HACK
cpyfakemstat64(&buf,st);
#else
cpyfakemstat64(&buf,st,ver);
#endif
buf.id=f;
send_fakem(&buf);
}
}
#endif /* STAT64_SUPPORT */
void send_get_stat(struct stat *st
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
){
struct fake_msg buf;
#ifndef FAKEROOT_FAKENET
if(init_get_msg()!=-1)
#endif /* ! FAKEROOT_FAKENET */
{
#ifndef STUPID_ALPHA_HACK
cpyfakemstat(&buf,st);
#else
cpyfakemstat(&buf,st,ver);
#endif
buf.id=stat_func;
send_get_fakem(&buf);
#ifndef STUPID_ALPHA_HACK
cpystatfakem(st,&buf);
#else
cpystatfakem(st,&buf,ver);
#endif
}
}
#ifdef STAT64_SUPPORT
void send_get_stat64(struct stat64 *st
#ifdef STUPID_ALPHA_HACK
, int ver
#endif
)
{
struct fake_msg buf;
#ifndef FAKEROOT_FAKENET
if(init_get_msg()!=-1)
#endif /* ! FAKEROOT_FAKENET */
{
#ifndef STUPID_ALPHA_HACK
cpyfakemstat64(&buf,st);
#else
cpyfakemstat64(&buf,st,ver);
#endif
buf.id=stat_func;
send_get_fakem(&buf);
#ifndef STUPID_ALPHA_HACK
cpystat64fakem(st,&buf);
#else
cpystat64fakem(st,&buf,ver);
#endif
}
}
#endif /* STAT64_SUPPORT */
#ifndef FAKEROOT_FAKENET
key_t get_ipc_key(key_t new_key)
{
const char *s;
static key_t key=-1;
if(key==-1){
if(new_key!=0)
key=new_key;
else if((s=env_var_set(FAKEROOTKEY_ENV)))
key=atoi(s);
else
key=0;
};
return key;
}
int init_get_msg(){
/* a msgget call generates a fstat() call. As fstat() is wrapped,
that call will in turn call semaphore_up(). So, before
the semaphores are setup, we should make sure we already have
the msg_get and msg_set id.
This is why semaphore_up() calls this function.*/
static int done=0;
key_t key;
if((!done)&&(msg_get==-1)){
key=get_ipc_key(0);
if(key){
msg_snd=msgget(get_ipc_key(0),IPC_CREAT|00600);
msg_get=msgget(get_ipc_key(0)+1,IPC_CREAT|00600);
}
else{
msg_get=-1;
msg_snd=-1;
}
done=1;
}
return msg_snd;
}
/* fake_get_owner() allows a process which has not set LD_PRELOAD to query
the fake ownership etc. of files. That process needs to know the key
in use by faked - faked prints this at startup. */
int fake_get_owner(int is_lstat, const char *key, const char *path,
uid_t *uid, gid_t *gid, mode_t *mode){
struct stat st;
int i;
if (!key || !strlen(key))
return 0;
/* Do the stat or lstat */
i = (is_lstat ? lstat(path, &st) : stat(path, &st));
if (i < 0)
return i;
/* Now pass it to faked */
get_ipc_key(atoi(key));
#ifndef STUPID_ALPHA_HACK
send_get_stat(&st);
#else
send_get_stat(&st, _STAT_VER);
#endif
/* Return the values inside the pointers */
if (uid)
*uid = st.st_uid;
if (gid)
*gid = st.st_gid;
if (mode)
*mode = st.st_mode;
return 0;
}
#endif /* ! FAKEROOT_FAKENET */
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