vitalif
/
libnfs
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

examples/ld_nfs.c : add hook for chmod and chown 

add hook on : __fxstatat(), __fxstatat64(), fchmodat(), fchown(),
chown(), fchownat() to support new implementation of chmod and to add
support for chown
libnfs-4.0.0-vitalif
Yann GASCUEL 2017-11-26 16:23:40 +01:00
parent fc568809d5
commit a3b793342b
1 changed files with 120 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

120
examples/ld_nfs.c
View File

@ -488,6 +488,27 @@ int __fxstat64(int ver, int fd, struct stat64 *buf)
return real_fxstat64(ver, fd, buf);
}
int (*real_fxstatat)(int ver, int fd, const char *path, struct stat *buf, int flag);
int __fxstatat(int ver, int fd, const char *path, struct stat *buf, int flag)
{
if (!strncmp(path, "nfs:", 4)) {
return __xstat(ver, path, buf);
}
return real_fxstatat(ver, fd, path, buf, flag);
}
int (*real_fxstatat64)(int ver, int fd, const char *path, struct stat64 *buf, int flag);
int __fxstatat64(int ver, int fd, const char *path, struct stat64 *buf, int flag)
{
if (!strncmp(path, "nfs:", 4)) {
return __xstat64(ver, path, buf);
}
return real_fxstatat64(ver, fd, path, buf, flag);
}
int (*real_fallocate)(int fd, int mode, off_t offset, off_t len);
int fallocate(int fd, int mode, off_t offset, off_t len)
@ -583,6 +604,69 @@ int chmod(const char *path, mode_t mode)
return real_chmod(path, mode);
}
int (*real_fchmodat)(int fd, const char *path, mode_t mode, int flags);
int fchmodat(int fd, const char *path, mode_t mode, int flags)
{
if (!strncmp(path, "nfs:", 4)) {
return chmod(path, mode);
}
return real_fchmodat(fd, path, mode, flags);
}
int (*real_fchown)(int fd, __uid_t uid, __gid_t gid);
int fchown(int fd, __uid_t uid, __gid_t gid)
{
if (nfs_fd_list[fd].is_nfs == 1) {
int ret;
LD_NFS_DPRINTF(9, "fchown(%d, %o, %o)", fd, (int)uid, (int)gid);
if ((ret = nfs_fchown(nfs_fd_list[fd].nfs,
nfs_fd_list[fd].fh,
uid, gid)) < 0) {
errno = -ret;
return -1;
}
return 0;
}
return real_fchown(fd, uid, gid);
}
int (*real_chown)(const char *path, __uid_t uid, __gid_t gid);
int chown(const char *path, __uid_t uid, __gid_t gid)
{
if (!strncmp(path, "nfs:", 4)) {
int fd, ret;
LD_NFS_DPRINTF(9, "chown(%s, %o, %o)", path, (int)uid, (int)gid);
fd = open(path, 0, 0);
if (fd == -1) {
return fd;
}
ret = fchown(fd, uid, gid);
close(fd);
return ret;
}
return real_chown(path, uid, gid);
}
int (*real_fchownat)(int fd, const char *path, __uid_t uid, __gid_t gid, int flags);
int fchownat(int fd, const char *path, uid_t uid, gid_t gid, int flags)
{
if (!strncmp(path, "nfs:", 4)) {
return chown(path, uid, gid);
}
return real_fchownat(fd, path, uid, gid, flags);
}
static void __attribute__((constructor)) _init(void)
{
int i;
@ -662,6 +746,18 @@ static void __attribute__((constructor)) _init(void)
exit(10);
}
real_fxstatat = dlsym(RTLD_NEXT, "__fxstatat");
if (real_fxstatat == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(__fxstatat)");
exit(10);
}
real_fxstatat64 = dlsym(RTLD_NEXT, "__fxstatat64");
if (real_fxstatat64 == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(__fxstatat64)");
exit(10);
}
real_fallocate = dlsym(RTLD_NEXT, "fallocate");
if (real_fallocate == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(fallocate)");
@ -697,4 +793,28 @@ static void __attribute__((constructor)) _init(void)
LD_NFS_DPRINTF(0, "Failed to dlsym(fchmod)");
exit(10);
}
real_fchmodat = dlsym(RTLD_NEXT, "fchmodat");
if (real_fchmodat == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(fchmodat)");
exit(10);
}
real_chown = dlsym(RTLD_NEXT, "chown");
if (real_chown == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(chown)");
exit(10);
}
real_fchown = dlsym(RTLD_NEXT, "fchown");
if (real_fchown == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(fchown)");
exit(10);
}
real_fchownat = dlsym(RTLD_NEXT, "fchownat");
if (real_fchownat == NULL) {
LD_NFS_DPRINTF(0, "Failed to dlsym(fchownat)");
exit(10);
}
}