Pe *
pe_begin(int fildes, Pe_Cmd cmd, Pe *ref)
{
Pe *retval = NULL;
if (ref != NULL) {
rwlock_rdlock(ref->lock);
} else if (fcntl(fildes, F_GETFL) == -1 && errno == EBADF) {
__libpe_seterrno(PE_E_INVALID_FILE);
return NULL;
}
switch (cmd) {
case PE_C_NULL:
break;
case PE_C_READ_MMAP_PRIVATE:
if (ref != NULL && ref->cmd != PE_C_READ_MMAP_PRIVATE) {
__libpe_seterrno(PE_E_INVALID_CMD);
break;
}
/* fall through */
case PE_C_READ:
case PE_C_READ_MMAP:
if (ref != NULL)
retval = dup_pe(fildes, cmd, ref);
else
retval = read_file(fildes, ~((size_t)0), cmd,
NULL);
break;
case PE_C_RDWR:
case PE_C_RDWR_MMAP:
if (ref != NULL) {
if (ref->cmd != PE_C_RDWR &&
ref->cmd != PE_C_RDWR_MMAP &&
ref->cmd != PE_C_WRITE &&
ref->cmd != PE_C_WRITE_MMAP) {
__libpe_seterrno(PE_E_INVALID_CMD);
retval = NULL;
}
} else {
retval = read_file(fildes, ~((size_t) 0), cmd,
NULL);
}
break;
case PE_C_WRITE:
case PE_C_WRITE_MMAP:
retval = write_file(fildes, cmd);
break;
default:
__libpe_seterrno(PE_E_INVALID_CMD);
break;
}
if (ref != NULL)
rwlock_unlock(ref->lock);
return retval;
}
static off_t
write_file(Pe *pe, off_t size, size_t shnum)
{
struct stat st;
if (fstat(pe->fildes, &st) != 0) {
__libpe_seterrno(PE_E_WRITE_ERROR);
return -1;
}
if (pe->parent == NULL && (pe->maximum_size == ~((size_t)0) ||
(size_t)size > pe->maximum_size) &&
ftruncate(pe->fildes, size) != 0) {
__libpe_seterrno(PE_E_WRITE_ERROR);
return -1;
}
if (pe->map_address == NULL && pe->cmd == PE_C_WRITE_MMAP) {
pe->map_address = mmap(NULL, size, PROT_READ|PROT_WRITE,
MAP_SHARED, pe->fildes, 0);
if (pe->map_address == MAP_FAILED)
pe->map_address = NULL;
}
if (pe->map_address != NULL) {
if (__pe_updatemmap(pe, shnum) != 0)
size = -1;
} else {
if (__pe_updatefile(pe, shnum) != 0)
size = -1;
}
if (size != -1 && pe->parent == NULL &&
pe->maximum_size != ~((size_t)0) &&
(size_t)size < pe->maximum_size &&
ftruncate(pe->fildes, size) != 0) {
__libpe_seterrno(PE_E_WRITE_ERROR);
size = -1;
}
if (size != -1 && (st.st_mode & (S_ISUID | S_ISGID)) &&
(fchmod(pe->fildes, st.st_mode) != 0)) {
__libpe_seterrno(PE_E_WRITE_ERROR);
size = -1;
}
if (size != -1 && pe->parent == NULL)
pe->maximum_size = size;
return size;
}
loff_t
pe_update(Pe *pe, Pe_Cmd cmd)
{
if (cmd != PE_C_NULL && cmd != PE_C_WRITE && cmd != PE_C_WRITE_MMAP) {
__libpe_seterrno(PE_E_INVALID_CMD);
return -1;
}
if (pe == NULL)
return -1;
if (pe->kind != PE_K_PE_EXE && pe->kind != PE_K_PE64_EXE &&
pe->kind != PE_K_PE_OBJ && pe->kind != PE_K_PE64_OBJ &&
pe->kind != PE_K_PE_ROM) {
__libpe_seterrno(PE_E_INVALID_HANDLE);
return -1;
}
size_t shnum = (pe->state.pe.scns_last->cnt == 0
? 0
: 1 + pe->state.pe.scns_last->data[
pe->state.pe.scns_last->cnt - 1].index);
off_t size = __pe_updatenull(pe, shnum);
if (size != -1 && (cmd == PE_C_WRITE || PE_C_WRITE_MMAP)) {
if (pe->cmd != PE_C_RDWR && pe->cmd != PE_C_RDWR_MMAP &&
pe->cmd != PE_C_WRITE &&
pe->cmd != PE_C_WRITE_MMAP) {
__libpe_seterrno(PE_E_UPDATE_RO);
size = -1;
} else if (pe->fildes == -1) {
__libpe_seterrno(PE_E_FD_DISABLED);
size = -1;
} else {
size = write_file(pe, size, shnum);
}
}
return size;
}
static Pe *
dup_pe(int fildes, Pe_Cmd cmd, Pe *ref)
{
if (fildes == -1) {
fildes = ref->fildes;
} else if (ref->fildes != -1 && fildes != ref->fildes) {
__libpe_seterrno(PE_E_FD_MISMATCH);
return NULL;
}
if (ref->cmd != PE_C_READ && ref->cmd != PE_C_READ_MMAP &&
ref->cmd != PE_C_WRITE && ref->cmd != PE_C_WRITE_MMAP &&
ref->cmd != PE_C_RDWR && ref->cmd != PE_C_RDWR_MMAP &&
ref->cmd != PE_C_READ_MMAP_PRIVATE) {
__libpe_seterrno(PE_E_INVALID_OP);
return NULL;
}
/* for now, just increment the refcount and return the same object */
ref->ref_count++;
return ref;
}
static struct pe_hdr *
__pe_getpehdr_rdlock(Pe *pe, struct pe_hdr *dest)
{
struct pe_hdr *result = NULL;
if (!pe)
return NULL;
if (pe->state.pe.pehdr == NULL) {
__libpe_seterrno(PE_E_WRONG_ORDER_PEHDR);
} else {
memcpy(dest, pe->state.pe.pehdr, sizeof(*dest));
result = dest;
}
return result;
}
struct section_header *
pe_getshdr(Pe_Scn *scn, struct section_header *dst)
{
struct section_header *result = NULL;
if (scn == NULL)
return NULL;
if (dst == NULL) {
__libpe_seterrno(PE_E_INVALID_OPERAND);
return NULL;
}
result = memcpy(dst, scn->shdr, sizeof(*dst));
return result;
}
int
__pe_updatefile(Pe *pe, size_t shnum)
{
__libpe_seterrno(PE_E_UNKNOWN_ERROR);
return 1;
}
