1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
Provide interfaces for front-ends.
Copyright (C) 2006,2007,2009 Tavis Ormandy <taviso@sdf.lonestar.org>
Copyright (C) 2009 Eli Dupree <elidupree@charter.net>
Copyright (C) 2009-2013 WANG Lu <coolwanglu@gmail.com>
Copyright (C) 2016 Sebastian Parschauer <s.parschauer@gmx.de>
This file is part of libscanmem.
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "config.h"
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <signal.h>
#include <stdbool.h>
#include "scanmem.h"
#include "commands.h"
#include "handlers.h"
#include "show_message.h"
void sm_printversion(FILE *outfd)
{
fprintf(outfd, "libscanmem version %s\n", PACKAGE_VERSION);
}
/* global settings */
globals_t sm_globals = {
0, /* exit flag */
0, /* pid target */
NULL, /* matches */
0, /* match count */
0, /* scan progress */
false, /* stop flag */
NULL, /* regions */
NULL, /* commands */
NULL, /* current_cmdline */
sm_printversion, /* printversion() pointer */
/* options */
{
1, /* alignment */
0, /* debug */
0, /* backend */
ANYINTEGER, /* scan_data_type */
REGION_HEAP_STACK_EXECUTABLE_BSS, /* region_detail_level */
1, /* dump_with_ascii */
0, /* reverse_endianness */
}
};
/* signal handler - use async-signal safe functions ONLY! */
static void sighandler(int n)
{
const char err_msg[] = "error: \nKilled by signal ";
const char msg_end[] = ".\n";
char num_str[4] = {0};
ssize_t num_size;
ssize_t wbytes;
wbytes = write(STDERR_FILENO, err_msg, sizeof(err_msg) - 1);
if (wbytes != sizeof(err_msg) - 1)
goto out;
/* manual int to str conversion */
if (n < 10) {
num_str[0] = (char) (0x30 + n);
num_size = 1;
} else if (n >= 100) {
goto out;
} else {
num_str[0] = (char) (0x30 + n / 10);
num_str[1] = (char) (0x30 + n % 10);
num_size = 2;
}
wbytes = write(STDERR_FILENO, num_str, num_size);
if (wbytes != num_size)
goto out;
wbytes = write(STDERR_FILENO, msg_end, sizeof(msg_end) - 1);
if (wbytes != sizeof(msg_end) - 1)
goto out;
out:
_exit(EXIT_FAILURE); /* also detaches from tracee */
}
bool sm_init(void)
{
globals_t *vars = &sm_globals;
/* before attaching to target, install signal handler to detach on error */
if (vars->options.debug == 0) /* in debug mode, let it crash and see the core dump */
{
(void) signal(SIGHUP, sighandler);
(void) signal(SIGINT, sighandler);
(void) signal(SIGSEGV, sighandler);
(void) signal(SIGABRT, sighandler);
(void) signal(SIGILL, sighandler);
(void) signal(SIGFPE, sighandler);
(void) signal(SIGTERM, sighandler);
}
/* linked list of commands and function pointers to their handlers */
if ((vars->commands = l_init()) == NULL) {
show_error("sorry, there was a memory allocation error.\n");
return false;
}
/* NULL shortdoc means don't display this command in `help` listing */
sm_registercommand("set", handler__set, vars->commands, SET_SHRTDOC,
SET_LONGDOC);
sm_registercommand("list", handler__list, vars->commands, LIST_SHRTDOC,
LIST_LONGDOC);
sm_registercommand("delete", handler__delete, vars->commands, DELETE_SHRTDOC,
DELETE_LONGDOC);
sm_registercommand("reset", handler__reset, vars->commands, RESET_SHRTDOC,
RESET_LONGDOC);
sm_registercommand("pid", handler__pid, vars->commands, PID_SHRTDOC,
PID_LONGDOC);
sm_registercommand("snapshot", handler__snapshot, vars->commands,
SNAPSHOT_SHRTDOC, SNAPSHOT_LONGDOC);
sm_registercommand("dregion", handler__dregion, vars->commands,
DREGION_SHRTDOC, DREGION_LONGDOC);
sm_registercommand("dregions", handler__dregion, vars->commands,
NULL, DREGION_LONGDOC);
sm_registercommand("lregions", handler__lregions, vars->commands,
LREGIONS_SHRTDOC, LREGIONS_LONGDOC);
sm_registercommand("version", handler__version, vars->commands,
VERSION_SHRTDOC, VERSION_LONGDOC);
sm_registercommand("=", handler__operators, vars->commands, NOTCHANGED_SHRTDOC,
NOTCHANGED_LONGDOC);
sm_registercommand("!=", handler__operators, vars->commands, CHANGED_SHRTDOC,
CHANGED_LONGDOC);
sm_registercommand("<", handler__operators, vars->commands, LESSTHAN_SHRTDOC,
LESSTHAN_LONGDOC);
sm_registercommand(">", handler__operators, vars->commands, GREATERTHAN_SHRTDOC,
GREATERTHAN_LONGDOC);
sm_registercommand("+", handler__operators, vars->commands, INCREASED_SHRTDOC,
INCREASED_LONGDOC);
sm_registercommand("-", handler__operators, vars->commands, DECREASED_SHRTDOC,
DECREASED_LONGDOC);
sm_registercommand("\"", handler__string, vars->commands, STRING_SHRTDOC,
STRING_LONGDOC);
sm_registercommand("update", handler__update, vars->commands, UPDATE_SHRTDOC,
UPDATE_LONGDOC);
sm_registercommand("exit", handler__exit, vars->commands, EXIT_SHRTDOC,
EXIT_LONGDOC);
sm_registercommand("quit", handler__exit, vars->commands, NULL, EXIT_LONGDOC);
sm_registercommand("q", handler__exit, vars->commands, NULL, EXIT_LONGDOC);
sm_registercommand("help", handler__help, vars->commands, HELP_SHRTDOC,
HELP_LONGDOC);
sm_registercommand("shell", handler__shell, vars->commands, SHELL_SHRTDOC, SHELL_LONGDOC);
sm_registercommand("!", handler__shell, vars->commands, NULL, SHELL_LONGDOC);
sm_registercommand("watch", handler__watch, vars->commands, WATCH_SHRTDOC,
WATCH_LONGDOC);
sm_registercommand("show", handler__show, vars->commands, SHOW_SHRTDOC, SHOW_LONGDOC);
sm_registercommand("dump", handler__dump, vars->commands, DUMP_SHRTDOC, DUMP_LONGDOC);
sm_registercommand("write", handler__write, vars->commands, WRITE_SHRTDOC, WRITE_LONGDOC);
sm_registercommand("option", handler__option, vars->commands, OPTION_SHRTDOC, OPTION_LONGDOC);
/* commands beginning with __ have special meaning */
sm_registercommand("__eof", handler__eof, vars->commands, NULL, NULL);
/* special value NULL means no other matches */
sm_registercommand(NULL, handler__default, vars->commands, DEFAULT_SHRTDOC,
DEFAULT_LONGDOC);
return true;
}
void sm_cleanup(void)
{
/* free any allocated memory used */
l_destroy(sm_globals.regions);
l_destroy(sm_globals.commands);
/* free matches array */
if (sm_globals.matches)
free(sm_globals.matches);
/* attempt to detach just in case */
sm_detach(sm_globals.target);
}
/* for front-ends */
void sm_set_backend(void)
{
sm_globals.options.backend = 1;
}
void sm_backend_exec_cmd(const char *commandline)
{
sm_execcommand(&sm_globals, commandline);
fflush(stdout);
fflush(stderr);
}
unsigned long sm_get_num_matches(void)
{
return sm_globals.num_matches;
}
const char *sm_get_version(void)
{
return PACKAGE_VERSION;
}
double sm_get_scan_progress(void)
{
return sm_globals.scan_progress;
}
void sm_set_stop_flag(bool stop_flag)
{
sm_globals.stop_flag = stop_flag;
}
|
