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ab3f09dfb0
guacamole-spice-protocol/libguac/src/protocol.c
Michael Jumper ab3f09dfb0 Fixed integer overflow in guac_sleep.
2011-04-01 00:30:40 -07:00

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_NANOSLEEP)
#include <time.h>
#endif
#ifndef HAVE_CLOCK_GETTIME
#include <sys/time.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <cairo/cairo.h>
#include <sys/types.h>
#ifdef __MINGW32__
#include <winsock2.h>
#else
#include <sys/socket.h>
#endif
#include "guacio.h"
#include "protocol.h"
char* guac_escape_string(const char* str) {
char* escaped;
char* current;
int i;
int length = 0;
/* Determine length */
for (i=0; str[i] != '\0'; i++) {
switch (str[i]) {
case ';':
case ',':
case '\\':
length += 2;
break;
default:
length++;
}
}
/* Allocate new */
escaped = malloc(length+1);
current = escaped;
for (i=0; str[i] != '\0'; i++) {
switch (str[i]) {
case ';':
*(current++) = '\\';
*(current++) = 's';
break;
case ',':
*(current++) = '\\';
*(current++) = 'c';
break;
case '\\':
*(current++) = '\\';
*(current++) = '\\';
break;
default:
*(current++) = str[i];
}
}
*current = '\0';
return escaped;
}
char* guac_unescape_string_inplace(char* str) {
char* from;
char* to;
from = to = str;
for (;;) {
char c = *(from++);
if (c == '\\') {
c = *(from++);
if (c == 's')
*(to++) = ';';
else if (c == 'c')
*(to++) = ',';
else if (c == '\\')
*(to++) = '\\';
else if (c == '\0') {
*(to++) = '\\';
break;
}
else {
*(to++) = '\\';
*(to++) = c;
}
}
else if (c == '\0')
break;
else
*(to++) = c;
}
*to = '\0';
return str;
}
int guac_send_args(GUACIO* io, const char** args) {
int i;
/* Handle protocols with no args */
if (args[0] == NULL)
return guac_write_string(io, "args;");
if (guac_write_string(io, "args:")) return -1;
for (i=0; args[i] != NULL; i++) {
char* escaped;
if (i > 0) {
if (guac_write_string(io, ","))
return -1;
}
escaped = guac_escape_string(args[i]);
if (guac_write_string(io, escaped)) {
free(escaped);
return -1;
}
free(escaped);
}
return guac_write_string(io, ";");
}
int guac_send_name(GUACIO* io, const char* name) {
char* escaped = guac_escape_string(name);
if (
guac_write_string(io, "name:")
|| guac_write_string(io, escaped)
|| guac_write_string(io, ";")
) {
free(escaped);
return -1;
}
free(escaped);
return 0;
}
int guac_send_size(GUACIO* io, int w, int h) {
return
guac_write_string(io, "size:")
|| guac_write_int(io, w)
|| guac_write_string(io, ",")
|| guac_write_int(io, h)
|| guac_write_string(io, ";");
}
int guac_send_clipboard(GUACIO* io, const char* data) {
char* escaped = guac_escape_string(data);
if (
guac_write_string(io, "clipboard:")
|| guac_write_string(io, escaped)
|| guac_write_string(io, ";")
) {
free(escaped);
return -1;
}
free(escaped);
return 0;
}
int guac_send_error(GUACIO* io, const char* error) {
char* escaped = guac_escape_string(error);
if (
guac_write_string(io, "error:")
|| guac_write_string(io, escaped)
|| guac_write_string(io, ";")
) {
free(escaped);
return -1;
}
free(escaped);
return 0;
}
int guac_send_sync(GUACIO* io, long timestamp) {
return
guac_write_string(io, "sync:")
|| guac_write_int(io, timestamp)
|| guac_write_string(io, ";");
}
int guac_send_copy(GUACIO* io,
int srcl, int srcx, int srcy, int w, int h,
guac_composite_mode_t mode, int dstl, int dstx, int dsty) {
return
guac_write_string(io, "copy:")
|| guac_write_int(io, srcl)
|| guac_write_string(io, ",")
|| guac_write_int(io, srcx)
|| guac_write_string(io, ",")
|| guac_write_int(io, srcy)
|| guac_write_string(io, ",")
|| guac_write_int(io, w)
|| guac_write_string(io, ",")
|| guac_write_int(io, h)
|| guac_write_string(io, ",")
|| guac_write_int(io, mode)
|| guac_write_string(io, ",")
|| guac_write_int(io, dstl)
|| guac_write_string(io, ",")
|| guac_write_int(io, dstx)
|| guac_write_string(io, ",")
|| guac_write_int(io, dsty)
|| guac_write_string(io, ";");
}
cairo_status_t __guac_write_png(void* closure, const unsigned char* data, unsigned int length) {
GUACIO* io = (GUACIO*) closure;
if (guac_write_base64(io, data, length) < 0)
return CAIRO_STATUS_WRITE_ERROR;
return CAIRO_STATUS_SUCCESS;
}
int guac_send_png(GUACIO* io, guac_composite_mode_t mode,
int layer, int x, int y, cairo_surface_t* surface) {
/* Write instruction and args */
if (
guac_write_string(io, "png:")
|| guac_write_int(io, mode)
|| guac_write_string(io, ",")
|| guac_write_int(io, layer)
|| guac_write_string(io, ",")
|| guac_write_int(io, x)
|| guac_write_string(io, ",")
|| guac_write_int(io, y)
|| guac_write_string(io, ",")
) {
return -1;
}
/* Write surface */
if (cairo_surface_write_to_png_stream(surface, __guac_write_png, io) != CAIRO_STATUS_SUCCESS) {
return -1;
}
if (guac_flush_base64(io) < 0) {
return -1;
}
/* Finish instruction */
return guac_write_string(io, ";");
}
int guac_send_cursor(GUACIO* io, int x, int y, cairo_surface_t* surface) {
/* Write instruction and args */
if (
guac_write_string(io, "cursor:")
|| guac_write_int(io, x)
|| guac_write_string(io, ",")
|| guac_write_int(io, y)
|| guac_write_string(io, ",")
) {
return -1;
}
/* Write surface */
if (cairo_surface_write_to_png_stream(surface, __guac_write_png, io) != CAIRO_STATUS_SUCCESS) {
return -1;
}
if (guac_flush_base64(io) < 0) {
return -1;
}
/* Finish instruction */
return guac_write_string(io, ";");
}
int __guac_fill_instructionbuf(GUACIO* io) {
int retval;
/* Attempt to fill buffer */
retval = recv(
io->fd,
io->instructionbuf + io->instructionbuf_used_length,
io->instructionbuf_size - io->instructionbuf_used_length,
0
);
if (retval < 0)
return retval;
io->instructionbuf_used_length += retval;
/* Expand buffer if necessary */
if (io->instructionbuf_used_length > io->instructionbuf_size / 2) {
io->instructionbuf_size *= 2;
io->instructionbuf = realloc(io->instructionbuf, io->instructionbuf_size);
}
return retval;
}
/* Returns new instruction if one exists, or NULL if no more instructions. */
int guac_read_instruction(GUACIO* io, guac_instruction* parsed_instruction) {
int retval;
int i = 0;
int argcount = 0;
int j;
int current_arg = 0;
/* Loop until a instruction is read */
for (;;) {
/* Search for end of instruction */
for (; i < io->instructionbuf_used_length; i++) {
/* Count arguments as we look for the end */
if (io->instructionbuf[i] == ',')
argcount++;
else if (io->instructionbuf[i] == ':' && argcount == 0)
argcount++;
/* End found ... */
else if (io->instructionbuf[i] == ';') {
/* Parse new instruction */
char* instruction = malloc(i+1);
memcpy(instruction, io->instructionbuf, i+1);
instruction[i] = '\0'; /* Replace semicolon with null terminator. */
parsed_instruction->opcode = NULL;
parsed_instruction->argc = argcount;
parsed_instruction->argv = malloc(sizeof(char*) * argcount);
for (j=0; j<i; j++) {
/* If encountered a colon, and no opcode parsed yet, set opcode and following argument */
if (instruction[j] == ':' && parsed_instruction->opcode == NULL) {
instruction[j] = '\0';
parsed_instruction->argv[current_arg++] = &(instruction[j+1]);
parsed_instruction->opcode = instruction;
}
/* If encountered a comma, set following argument */
else if (instruction[j] == ',') {
instruction[j] = '\0';
parsed_instruction->argv[current_arg++] = &(instruction[j+1]);
}
}
/* If no arguments, set opcode to entire instruction */
if (parsed_instruction->opcode == NULL)
parsed_instruction->opcode = instruction;
/* Found. Reset buffer */
memmove(io->instructionbuf, io->instructionbuf + i + 1, io->instructionbuf_used_length - i - 1);
io->instructionbuf_used_length -= i + 1;
/* Done */
return 1;
}
}
/* No instruction yet? Get more data ... */
retval = guac_select(io, GUAC_USEC_TIMEOUT);
if (retval <= 0)
return retval;
/* If more data is available, fill into buffer */
retval = __guac_fill_instructionbuf(io);
if (retval < 0) return retval; /* Error */
if (retval == 0) return -1; /* EOF */
}
}
void guac_free_instruction_data(guac_instruction* instruction) {
free(instruction->opcode);
if (instruction->argv)
free(instruction->argv);
}
void guac_free_instruction(guac_instruction* instruction) {
guac_free_instruction_data(instruction);
free(instruction);
}
int guac_instructions_waiting(GUACIO* io) {
if (io->instructionbuf_used_length > 0)
return 1;
return guac_select(io, GUAC_USEC_TIMEOUT);
}
long guac_current_timestamp() {
#ifdef HAVE_CLOCK_GETTIME
struct timespec current;
/* Get current time */
clock_gettime(CLOCK_REALTIME, &current);
/* Calculate milliseconds */
return current.tv_sec * 1000 + current.tv_nsec / 1000000;
#else
struct timeval current;
/* Get current time */
gettimeofday(&current, NULL);
/* Calculate milliseconds */
return current.tv_sec * 1000 + current.tv_usec / 1000;
#endif
}
void guac_sleep(int millis) {
#ifdef HAVE_NANOSLEEP
struct timespec sleep_period;
sleep_period.tv_sec = millis / 1000;
sleep_period.tv_nsec = (millis % 1000) * 1000000L;
nanosleep(&sleep_period, NULL);
#elif defined(__MINGW32__)
Sleep(millis)
#else
#warning No sleep/nanosleep function available. Clients may not perform as expected. Consider patching libguac to add support for your platform.
#endif
}
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