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/*
$Id: main.c,v 1.24 2007-06-05 01:45:35+01 taviso Exp $
Copyright (C) 2006,2007 Tavis Ormandy <taviso@sdf.lonestar.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <getopt.h> /*lint -e537 */
#include <signal.h>
#include <stdbool.h>
#include "scanmem.h"
#include "commands.h"
#include "handlers.h"
static void printhelp(void);
static void sighandler(int n);
/* global settings */
globals_t globals = {
0, /* exit flag */
0, /* pid target */
NULL, /* matches */
NULL, /* regions */
NULL, /* commands */
};
int main(int argc, char **argv)
{
char *end;
int optindex, ret = EXIT_SUCCESS;
globals_t *vars = &globals;
struct option longopts[] = {
{"pid", 1, NULL, 'p'}, /* target pid */
{"version", 0, NULL, 'v'}, /* print version */
{"help", 0, NULL, 'h'}, /* print help summary */
{NULL, 0, NULL, 0},
};
/* process command line */
while (true) {
switch (getopt_long(argc, argv, "vhp:", longopts, &optindex)) {
case 'p':
vars->target = (pid_t) strtoul(optarg, &end, 0);
/* check if that parsed correctly */
if (*end != '\0' || *optarg == '\0' || vars->target == 0) {
fprintf(stderr, "error: invalid pid specified.\n");
return EXIT_FAILURE;
}
break;
case 'v':
printversion(stdout);
return EXIT_SUCCESS;
case 'h':
printhelp();
return EXIT_SUCCESS;
case -1:
goto done;
default:
printhelp();
return EXIT_FAILURE;
}
}
done:
/* parse any pid specified after arguments */
if (optind <= argc && argv[optind]) {
vars->target = (pid_t) strtoul(argv[optind], &end, 0);
/* check if that parsed correctly */
if (*end != '\0' || argv[optind][0] == '\0' || vars->target == 0) {
fprintf(stderr, "error: invalid pid specified.\n");
return EXIT_FAILURE;
}
}
/* before attaching to target, install signal handler to detach on error */
(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) {
fprintf(stderr, "error: sorry, there was a memory allocation error.\n");
ret = EXIT_FAILURE;
goto end;
}
/* NULL shortdoc means dont display this command in `help` listing */
registercommand("set", handler__set, vars->commands, SET_SHRTDOC,
SET_LONGDOC);
registercommand("list", handler__list, vars->commands, LIST_SHRTDOC,
LIST_LONGDOC);
registercommand("delete", handler__delete, vars->commands, DELETE_SHRTDOC,
DELETE_LONGDOC);
registercommand("reset", handler__reset, vars->commands, RESET_SHRTDOC,
RESET_LONGDOC);
registercommand("pid", handler__pid, vars->commands, PID_SHRTDOC,
PID_LONGDOC);
registercommand("snapshot", handler__snapshot, vars->commands,
SNAPSHOT_SHRTDOC, SNAPSHOT_LONGDOC);
registercommand("dregion", handler__dregion, vars->commands,
DREGION_SHRTDOC, DREGION_LONGDOC);
registercommand("dregions", handler__dregion, vars->commands,
NULL, DREGION_LONGDOC);
registercommand("lregions", handler__lregions, vars->commands,
LREGIONS_SHRTDOC, LREGIONS_LONGDOC);
registercommand("version", handler__version, vars->commands,
VERSION_SHRTDOC, VERSION_LONGDOC);
registercommand("=", handler__decinc, vars->commands, EQU_SHRTDOC,
EQU_LONGDOC);
registercommand("<", handler__decinc, vars->commands, DEC_SHRTDOC,
DEC_LONGDOC);
registercommand(">", handler__decinc, vars->commands, INC_SHRTDOC,
INC_LONGDOC);
registercommand("exit", handler__exit, vars->commands, EXIT_SHRTDOC,
EXIT_LONGDOC);
registercommand("quit", handler__exit, vars->commands, NULL, EXIT_LONGDOC);
registercommand("q", handler__exit, vars->commands, NULL, EXIT_LONGDOC);
registercommand("help", handler__help, vars->commands, HELP_SHRTDOC,
HELP_LONGDOC);
registercommand("shell", handler__shell, vars->commands, SHELL_SHRTDOC, SHELL_LONGDOC);
registercommand("watch", handler__watch, vars->commands, WATCH_SHRTDOC,
WATCH_LONGDOC);
registercommand("show", handler__show, vars->commands, SHOW_SHRTDOC, SHOW_LONGDOC);
/* commands beginning with __ have special meaning */
registercommand("__eof", handler__eof, vars->commands, NULL, NULL);
/* special value NULL means no other matches */
registercommand(NULL, handler__default, vars->commands, DEFAULT_SHRTDOC,
DEFAULT_LONGDOC);
printversion(stdout);
/* this will initialise matches and regions */
if (execcommand(vars, "reset") == false) {
vars->target = 0;
}
/* check if there is a target already specified */
if (vars->target == 0) {
fprintf(stdout,
"Enter the pid of the process to search using the \"pid\" command.\n");
fprintf(stdout, "Enter \"help\" for other commands.\n");
} else {
fprintf(stdout,
"Please enter current value, or \"help\" for other commands.\n");
}
/* main loop, read input and process commands */
while (!vars->exit) {
char *line;
/* reads in a commandline from the user, and returns a pointer to it in *line */
if (getcommand(vars, &line) == false) {
fprintf(stderr, "error: failed to read in a command.\n");
ret = EXIT_FAILURE;
break;
}
/* execcommand returning failure isnt fatal, just the a command couldnt complete. */
if (execcommand(vars, line) == false) {
if (vars->target == 0) {
fprintf(stdout,
"Enter the pid of the process to search using the \"pid\" command.\n");
fprintf(stdout, "Enter \"help\" for other commands.\n");
} else {
fprintf(stderr,
"Please enter current value, or \"help\" for other commands.\n");
}
}
free(line);
}
end:
/* now free any allocated memory used */
l_destroy(vars->regions);
l_destroy(vars->matches);
l_destroy(vars->commands);
/* attempt to detach just in case */
(void) detach(vars->target);
return ret;
}
void sighandler(int n)
{
fprintf(stderr, "\nerror: fatal signal %d.\n", n);
if (globals.target) {
(void) detach(globals.target);
}
exit(EXIT_FAILURE);
}
/* print quick usage message to stdout */
void printhelp(void)
{
printversion(stdout);
fprintf(stdout, "Usage: scanmem [OPTION]... [PID]\n"
"Interactively locate and modify variables in an executing process.\n"
"\n"
"-p, --pid=pid\t\tset the target process pid\n"
"-h, --help\t\tprint this message\n"
"-v, --version\t\tprint version information\n"
"\n"
"scanmem is an interactive debugging utility, enter `help` at the prompt\n"
"for further assistance.\n"
"\n" "Report bugs to <%s>.\n", PACKAGE_BUGREPORT);
return;
}
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