radare2/libr/io/io.c

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/* radare - LGPL - Copyright 2008-2012 - pancake */
#include "r_io.h"
#include "r_util.h"
#include <stdio.h>
// TODO: R_API int r_io_fetch(struct r_io_t *io, ut8 *buf, int len)
// --- check for EXEC perms in section (use cached read to accelerate)
R_API struct r_io_t *r_io_new() {
RIO *io = R_NEW (RIO);
if (!io) return NULL;
io->fd = NULL;
io->write_mask_fd = -1;
io->redirect = NULL;
io->printf = (void*) printf;
io->bits = (sizeof(void*) == 8)? 64: 32;
io->va = -1;
io->plugin = NULL;
io->raised = -1;
io->off = 0;
r_io_cache_init (io);
r_io_map_init (io);
r_io_section_init (io);
r_io_plugin_init (io);
r_io_desc_init (io);
r_io_undo_init (io);
return io;
}
R_API void r_io_raise(RIO *io, int fd) {
io->raised = fd;
}
R_API int r_io_is_listener(RIO *io) {
if (io && io->plugin && io->plugin->listener)
return io->plugin->listener (io->fd);
return R_FALSE;
}
R_API RBuffer *r_io_read_buf(struct r_io_t *io, ut64 addr, int len) {
RBuffer *b = R_NEW (RBuffer);
b->buf = malloc (len);
len = r_io_read_at (io, addr, b->buf, len);
b->length = (len<0)?0:len;
return b;
}
R_API int r_io_write_buf(struct r_io_t *io, struct r_buf_t *b) {
return r_io_write_at(io, b->base, b->buf, b->length);
}
R_API RIO *r_io_free(RIO *io) {
if (!io) return NULL;
/* TODO: properly free inner nfo */
/* TODO: memory leaks */
r_list_free (io->sections);
r_list_free (io->maps);
r_io_desc_fini (io);
free (io);
return NULL;
}
/* used by uri handler plugins */
R_API int r_io_redirect(struct r_io_t *io, const char *file) {
free (io->redirect);
io->redirect = file? strdup (file): NULL;
return 0;
}
R_API RIODesc *r_io_open_as(struct r_io_t *io, const char *urihandler, const char *file, int flags, int mode) {
RIODesc *ret;
char *uri;
int urilen, hlen = strlen (urihandler);
urilen = hlen + strlen (file)+5;
uri = malloc (urilen);
if (uri == NULL)
return NULL;
if (hlen>0) snprintf (uri, urilen, "%s://%s", urihandler, file);
else strncpy (uri, file, urilen);
ret = r_io_open (io, uri, flags, mode);
free (uri);
return ret;
}
R_API RIODesc *r_io_open(RIO *io, const char *file, int flags, int mode) {
struct r_io_plugin_t *plugin;
RIODesc *desc = NULL;
int fd = -2;
char *uri;
if (!io) return NULL;
uri = strdup (file);
for (;;) {
plugin = r_io_plugin_resolve (io, uri);
if (plugin && plugin->open) {
desc = plugin->open (io, uri, flags, mode);
if (io->redirect) {
// TODO: free desc if not null
free ((void *)uri);
uri = strdup (io->redirect);
r_io_redirect (io, NULL);
continue;
}
if (desc != NULL) {
r_io_desc_add (io, desc);
fd = desc->fd;
if (fd != -1)
r_io_plugin_open (io, fd, plugin);
if (desc != io->fd)
io->plugin = plugin;
}
}
break;
}
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if (fd == -2) {
#if __WINDOWS__
if (flags & R_IO_WRITE) {
fd = open (uri, O_BINARY | 1);
if (fd == -1)
creat (uri, O_BINARY);
fd = open (uri, O_BINARY | 1);
} else fd = open (uri, O_BINARY);
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#else
fd = open (uri, (flags&R_IO_WRITE)?O_RDWR:O_RDONLY, mode);
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#endif
}
if (fd >= 0) {
if (desc == NULL)
desc = r_io_desc_new (io->plugin,
fd, uri, flags, mode, NULL);
r_io_desc_add (io, desc);
r_io_set_fd (io, desc);
}
free ((void *)uri);
return desc;
}
R_API int r_io_set_fd(RIO *io, RIODesc *fd) {
if (fd != NULL) {
io->fd = fd;
io->plugin = fd->plugin;
return R_TRUE;
}
return R_FALSE;
}
R_API int r_io_set_fdn(RIO *io, int fd) {
if (fd != -1 && io->fd != NULL && fd != io->fd->fd) {
RIODesc *desc = r_io_desc_get (io, fd);
if (!desc) return R_FALSE;
io->fd = desc;
io->plugin = desc->plugin;
return R_TRUE;
}
return R_FALSE;
}
static inline int r_io_read_internal(RIO *io, ut8 *buf, int len) {
if (io->plugin && io->plugin->read)
return io->plugin->read (io, io->fd, buf, len);
return read (io->fd->fd, buf, len);
}
R_API int r_io_read(RIO *io, ut8 *buf, int len) {
if (io==NULL || io->fd == NULL)
return -1;
/* IGNORE check section permissions
if (io->enforce_rwx && !(r_io_section_get_rwx (io, io->off) & R_IO_READ))
return -1;
*/
return r_io_read_at (io, io->off, buf, len);
}
// XXX: this is buggy. must use seek+read
R_API int r_io_read_at(RIO *io, ut64 addr, ut8 *buf, int len) {
int ret, l, olen = len;
int w = 0;
int eof = 0;
r_io_seek (io, addr, R_IO_SEEK_SET);
#if 0
// HACK?: if io->va == 0 -> call seek+read without checking sections ?
if (!io->va) {
// r_io_seek (io, addr, R_IO_SEEK_SET);
r_io_map_select (io, addr);
ret = r_io_read_internal (io, buf, len);
if (io->cached) {
r_io_cache_read (io, addr, buf, len);
}
return ret;
}
#endif
// XXX: this is buggy!
memset (buf, 0xff, len);
#if 0
ret = r_io_read_internal (io, buf, len);
return len;
#endif
while (len>0) {
int ms;
ut64 last = r_io_section_next (io, addr);
l = (len > (last-addr))? (last-addr): len;
if (l<1) l = len;
// ignore seek errors
// eprintf ("0x%llx %llx\n", addr+w,
//r_io_seek (io, addr+w, R_IO_SEEK_SET);
if (r_io_seek (io, addr+w, R_IO_SEEK_SET)==UT64_MAX) {
memset (buf+w, 0xff, l);
return -1;
}
ms = r_io_map_select (io, addr+w);
ret = r_io_read_internal (io, buf+w, l);
if (ret<1) {
memset (buf+w, 0xff, l); // reading out of file
ret = 1;
} else if (ret<l) {
// eprintf ("FOUND EOF AT %llx\n", addr+ret);
eof = 1;
l = ret;
} else {
//eprintf ("L = %d\n", len-w);
eof = 1;
}
if (io->cached) {
r_io_cache_read (io, addr+w, buf+w, len-w);
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} else
// hide non-mapped files here
// do not allow reading on real addresses if mapped != 0
if (r_list_length (io->maps) >1)
if (!io->debug && ms>0) {
//eprintf ("FAIL MS=%d l=%d d=%d\n", ms, l, d);
/* check if address is vaddred in sections */
ut64 o = r_io_section_offset_to_vaddr (io, addr);
if (o == UT64_MAX) {
ut64 o = r_io_section_vaddr_to_offset (io, addr);
if (o == UT64_MAX)
memset (buf+w, 0xff, l);
}
break;
}
////if (eof) break;
w += l;
len -= l;
break;
}
return olen;
}
R_API ut64 r_io_read_i(RIO *io, ut64 addr, int sz, int endian) {
ut64 ret = 0LL;
int err;
ut8 buf[8];
if (sz > 8) sz = 8;
if (sz < 0) sz = 1;
err = r_io_read_at (io, addr, buf, sz);
if (err == sz) r_mem_copyendian ((ut8*)&ret, buf, sz, endian);
else return -1;
//else perror("Cannot read");
return ret;
}
R_API int r_io_resize(RIO *io, ut64 newsize) {
if (io->plugin && io->plugin->resize)
return io->plugin->resize (io, io->fd, newsize);
else ftruncate (io->fd->fd, newsize);
return R_FALSE;
}
R_API int r_io_set_write_mask(RIO *io, const ut8 *buf, int len) {
int ret = R_FALSE;
if (len) {
io->write_mask_fd = io->fd->fd;
io->write_mask_buf = (ut8 *)malloc (len);
memcpy (io->write_mask_buf, buf, len);
io->write_mask_len = len;
ret = R_TRUE;
} else io->write_mask_fd = -1;
return ret;
}
R_API int r_io_write(struct r_io_t *io, const ut8 *buf, int len) {
int i, ret = -1;
ut8 *data = NULL;
/* check section permissions */
if (io->enforce_rwx && !(r_io_section_get_rwx (io, io->off) & R_IO_WRITE))
return -1;
if (io->cached) {
ret = r_io_cache_write (io, io->off, buf, len);
if (ret == len)
return len;
if (ret > 0) {
len -= ret;
buf += ret;
}
}
/* TODO: implement IO cache here. to avoid dupping work on vm for example */
/* apply write binary mask */
if (io->write_mask_fd != -1) {
data = malloc (len);
r_io_seek (io, io->off, R_IO_SEEK_SET);
r_io_read (io, data, len);
r_io_seek (io, io->off, R_IO_SEEK_SET);
for (i=0; i<len; i++)
data[i] = buf[i] & \
io->write_mask_buf[i%io->write_mask_len];
buf = data;
}
r_io_map_select (io, io->off);
if (io->plugin) {
if (io->plugin->write)
ret = io->plugin->write (io, io->fd, buf, len);
else eprintf ("r_io_write: io handler with no write callback\n");
} else ret = write (io->fd->fd, buf, len);
if (ret == -1)
eprintf ("r_io_write: cannot write on fd %d\n", io->fd->fd);
if (data)
free (data);
return ret;
}
R_API int r_io_write_at(struct r_io_t *io, ut64 addr, const ut8 *buf, int len) {
if (r_io_seek (io, addr, R_IO_SEEK_SET)<0)
return -1;
return r_io_write (io, buf, len);
}
R_API ut64 r_io_seek(struct r_io_t *io, ut64 offset, int whence) {
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int posix_whence = SEEK_SET;
ut64 ret = UT64_MAX;
switch (whence) {
case R_IO_SEEK_SET:
posix_whence = SEEK_SET;
ret = offset;
break;
case R_IO_SEEK_CUR:
// offset += io->off;
posix_whence = SEEK_CUR;
ret = offset+io->off;
break;
case R_IO_SEEK_END:
//offset = UT64_MAX; // XXX: depending on io bits?
ret = UT64_MAX;
posix_whence = SEEK_END;
break;
}
if (io == NULL)
return ret;
// XXX: list_empty trick must be done in r_io_set_va();
//eprintf ("-(seek)-> 0x%08llx\n", offset);
if (!io->debug && io->va && !r_list_empty (io->sections)) {
ut64 o = r_io_section_vaddr_to_offset (io, offset);
if (o != UT64_MAX)
offset = o;
// eprintf ("-(vadd)-> 0x%08llx\n", offset);
}
// if resolution fails... just return as invalid address
if (offset==UT64_MAX)
return UT64_MAX;
// TODO: implement io->enforce_seek here!
if (io->fd != NULL) {
// lseek_internal
if (io->plugin && io->plugin->lseek)
ret = io->plugin->lseek (io, io->fd, offset, whence);
// XXX can be problematic on w32..so no 64 bit offset?
else ret = (ut64)lseek (io->fd->fd, offset, posix_whence);
if (ret != UT64_MAX) {
io->off = ret;
// XXX this can be tricky.. better not to use this .. must be deprecated
// r_io_sundo_push (io);
ret = (!io->debug && io->va && !r_list_empty (io->sections))?
r_io_section_offset_to_vaddr (io, io->off) : io->off;
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} //else eprintf ("r_io_seek: cannot seek to %"PFMT64x"\n", offset);
} //else { eprintf ("r_io_seek: null fd\n"); }
return ret;
}
R_API ut64 r_io_size(RIO *io) {
int iova;
ut64 size, here;
if (!io) return 0LL;
iova = io->va;
if (r_io_is_listener (io))
return UT64_MAX;
// XXX. problematic when io.va = 1
io->va = 0;
//r_io_set_fdn (io, fd);
here = r_io_seek (io, 0, R_IO_SEEK_CUR);
size = r_io_seek (io, 0, R_IO_SEEK_END);
io->va = iova;
r_io_seek (io, here, R_IO_SEEK_SET);
return size;
}
R_API int r_io_system(RIO *io, const char *cmd) {
int ret = -1;
if (io->plugin && io->plugin->system)
ret = io->plugin->system (io, io->fd, cmd);
return ret;
}
// TODO: remove int fd here???
R_API int r_io_close(struct r_io_t *io, RIODesc *fd) {
if (io == NULL || fd == NULL)
return -1;
int nfd = fd->fd;
if (r_io_set_fd (io, fd)) {
RIODesc *desc = r_io_desc_get (io, fd->fd);
if (desc) {
r_io_map_del (io, fd->fd);
r_io_plugin_close (io, fd->fd, io->plugin);
if (io->plugin && io->plugin->close)
return io->plugin->close (desc);
r_io_desc_del (io, desc->fd);
}
}
io->fd = NULL; // unset current fd
return close (nfd);
}
R_API int r_io_bind(RIO *io, RIOBind *bnd) {
bnd->io = io;
bnd->init = R_TRUE;
bnd->read_at = r_io_read_at;
bnd->write_at = r_io_write_at;
//bnd->fd = io->fd;// do we need to store ptr to fd??
return R_TRUE;
}
R_API int r_io_accept(RIO *io, int fd) {
if (r_io_is_listener (io) && io->plugin && io->plugin->accept)
return io->plugin->accept (io, io->fd, fd);
return R_FALSE;
}
/* moves bytes up (+) or down (-) within the specified range */
R_API int r_io_shift(RIO *io, ut64 start, ut64 end, st64 move) {
ut8 *buf;
ut64 chunksize = 0x10000;
ut64 rest, src, shiftsize = r_num_abs (move);
if (!shiftsize || (end-start) <= shiftsize) return R_FALSE;
rest = (end-start) - shiftsize;
if (!(buf = malloc (chunksize))) return R_FALSE;
if (move>0) src = end-shiftsize;
else src = start+shiftsize;
while (rest>0) {
if (chunksize>rest) chunksize=rest;
if (move>0) src -= chunksize;
r_io_read_at (io, src, buf, chunksize);
r_io_write_at (io, src+move, buf, chunksize);
if (move<0) src += chunksize;
rest -= chunksize;
}
free (buf);
return R_TRUE;
}
R_API int r_io_create (RIO *io, const char *file, int mode, int type) {
if (io->plugin && io->plugin->create)
return io->plugin->create (io, file, mode, type);
if (type == 'd'|| type == 1)
return r_sys_mkdir (file);
return creat (file, mode)? R_FALSE: R_TRUE;
}