iptraf.c

一个网络流量分析的完整的程序

			servmon(ifname, ports, options, 0, &ofilter);
		    break;
		case 4:
		    break;
		}
		tx_destroymenu(&break_menu);
		break;
	    case 5:
		selectiface(ifname, WITHALL, &aborted);
		if (!aborted) {
		    if (strcmp(ifname, "") != 0)
			ifptr = ifname;
		    else
			ifptr = NULL;
		    hostmon(options, 0, ifptr);
		}
		break;
	    case 7:
		config_filters(&ofilter);
		savefilters(&ofilter);
		break;
	    case 9:
		setoptions(options, &ports);
		saveoptions(options);
		break;
	    case 11:
                tx_errbox("This will end your IPTraf session",
                          "Press Enter to exit or any other key to resume", &resp);
                if (resp == 13) 	/* Enter key to confirm exit */	        
		    endloop = 1;
		break;
	    }
	} while (!endloop);

	tx_destroymenu(&menu);
    } else {
	switch (opt) {
	case 'i':
	    if ((strcmp(optarg, ALLSPEC) == 0)
		|| (strcmp(optarg, "") == 0))
		ifptr = NULL;
	    else
		ifptr = optarg;

	    ipmon(options, &ofilter, facilitytime, ifptr);
	    break;
	case 'g':
	    ifstats(options, &ofilter, facilitytime);
	    break;
	case 'd':
	    detstats(optarg, options, facilitytime, &ofilter);
	    break;
	case 's':
	    servmon(optarg, ports, options, facilitytime, &ofilter);
	    break;
	case 'z':
	    packet_size_breakdown(options, optarg, facilitytime);
	    break;
	case 'l':
	    if ((strcmp(optarg, ALLSPEC) == 0)
		|| (strcmp(optarg, "") == 0))
		ifptr = NULL;
	    else
		ifptr = optarg;

	    hostmon(options, facilitytime, ifptr);
	    break;
	}
    }

    destroyporttab(ports);
    erase();
    update_panels();
    doupdate();
}


/*
 * Command-line help facility.
 */

void commandhelp()
{
    printf("\nSyntax:\n");
    printf
	("    iptraf [ -f ] [ { -i iface | -g | -d iface | -s iface | -z iface |\n");
    printf("           -l iface } [ -t timeout ] [ -B [ -L logfile ] ] ]\n\n");
    printf
	("Issue the iptraf command with no parameters for menu-driven operation.\n");
    printf("These options can also be supplied to the command:\n\n");
    printf
	("-i iface    - start the IP traffic monitor (use \"-i all\" for all interfaces)\n");
    printf("-g          - start the general interface statistics\n");
    printf
	("-d iface    - start the detailed statistics facility on an interface\n");
    printf
	("-s iface    - start the TCP and UDP monitor on an interface\n");
    printf("-z iface    - shows the packet size counts on an interface\n");
    printf
	("-l iface    - start the LAN station monitor (\"-l all\" for all LAN interfaces)\n");
    printf
	("-B          - run in background (use only with one of the above parameters)\n");
    printf
	("-t timeout  - when used with one of the above parameters, tells\n");
    printf
	("              the facility to run only for the specified number of\n");
    printf("              minutes (timeout)\n");
    printf
        ("-L logfile  - when used with -B, allows you to specify an alternate\n");
    printf
        ("              log file.  The log is placed in %s if a path is not\n", LOGDIR);
    printf
        ("              specified.\n"); 
    printf
	("-f          - Clear all locks and counters.  Use with great caution.\n");
    printf
        ("              Normally used to recover from an abnormal termination.\n\n");
    printf("IPTraf %s Copyright (c) Gerard Paul Java 1997-2002\n",
	   VERSION);
}

int first_instance()
{
    int fd;

    fd = open(IPTIDFILE, O_RDONLY);

    if (fd < 0)
	return !0;
    else {
	close(fd);
	return 0;
    }
}

void mark_first_instance()
{
    int fd;

    fd = open(IPTIDFILE, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR);
    if (fd < 0) {
	fprintf(stderr, "\nWarning: unable to tag this process\r\n");
        press_enter_to_continue();
	return;
    }
    close(fd);
}

/*
 * Main routine
 */

int main(int argc, char **argv)
{
    struct OPTIONS options;
    int opt = 0;
    int command = 0;
    char keyparm[12];
    int facilitytime = 0;

#ifndef ALLOWUSERS
    if (getuid() != 0) {
	fprintf(stderr, "\nIPTraf Version %s\n", VERSION);
	fprintf(stderr, "Copyright (c) Gerard Paul Java 1997-2002l\n\n");
	fprintf(stderr,
		"This program can be run only by the system administrator\n\n");
	exit(1);
    }
#endif

    strcpy(current_logfile, "");
    
    /*
     * Parse command line
     */

    if (argc > 1) {
	do {
	    opterr = 0;
	    opt = getopt(argc, argv, "i:gd:s:z:l:hfqt:BL:u");

	    if (opt == 'h') {
		commandhelp();
		exit(0);
	    } else if (opt == 'f') {
		removetags();
		remove_sockets();
	    } else if (opt == 't') {
		facilitytime = atoi(optarg);
		if (facilitytime == 0) {
		    fprintf(stderr, "\nInvalid time value\n\n");
		    exit(1);
		}
	    } else if (opt == 'B') {
		daemonized = 1;
	    } else if (opt == 'L') {
	        if (strchr(optarg, '/') != NULL)
	            strncpy(current_logfile, optarg, 80);
	        else
	            strncpy(current_logfile, get_path(T_LOGDIR, optarg), 80);
	    } else if (opt == 'q') {
		/* -q parameter now ignored, maintained for compatibility */
	    } else if (opt == 'u') {
	        accept_unsupported_interfaces = 1;
	    } else if (opt == '?') {
		fprintf(stderr,
			"\nInvalid option or missing parameter, use iptraf -h for help\n\n");
		exit(1);
	    } else if (opt != -1) {
		if (optarg != 0) {
		    bzero(keyparm, 12);
		    strncpy(keyparm, optarg, 11);
		} else
		    strcpy(keyparm, "");

		command = opt;
	    }
	} while ((opt != '?') && (opt != -1));
    }
    is_first_instance = first_instance();

    if (getenv("TERM") == NULL) {
	fprintf(stderr, "Your TERM variable is not set.\n");
	fprintf(stderr, "Please set it to an appropriate value.\n");
	exit(1);
    }
    loadoptions(&options);

    /*
     * If a facility is directly invoked from the command line, check for
     * a daemonization request
     */

    if ((daemonized) && (command != 0)) {
	switch (fork()) {
	case 0:		/* child */
	    setsid();
	    freopen("/dev/null", "w", stdout);	/* redirect std output */
	    freopen("/dev/null", "r", stdin);	/* redirect std input */
	    freopen("/dev/null", "w", stderr);	/* redirect std error */
	    signal(SIGUSR2, (void *) term_usr2_handler);
	    options.logging = 1;	/* daemon mode implies logging */
	    break;
	case -1:		/* error */
	    fprintf(stderr,
		    "\nFork error, IPTraf cannot run in background\n\n");
	    exit(1);
	default:		/* parent */
	    exit(0);
	}
    }
#ifdef SIMDAEMON
    daemonized = 1;
    freopen("/dev/null", "w", stdout);	/* redirect std output */
    freopen("/dev/null", "r", stdin);
    freopen("/dev/null", "w", stderr);
#endif

    initscr();

    if ((LINES < 24) || (COLS < 80)) {
	endwin();
	fprintf(stderr,
		"\nThis program requires a screen size of at least 80 columns by 24 lines\n");
	fprintf(stderr, "Please resize your window\n\n");
	exit(1);
    }

    mark_first_instance();
    
    signal(SIGTERM, (void *) term_signal_handler);
    signal(SIGHUP, (void *) term_signal_handler);
    signal(SIGSEGV, (void *) segvhandler);
    signal(SIGTSTP, SIG_IGN);
    signal(SIGINT, SIG_IGN);
    signal(SIGUSR1, SIG_IGN);

    start_color();
    standardcolors(options.color);
    noecho();
    nonl();
    cbreak();

#ifndef DEBUG
    curs_set(0);
#endif

    /*
     * Set logfilename variable to an empty string in case -L was specified
     * without -B.
     */
     
    if (!daemonized)
        strcpy(current_logfile, "");
        
    program_interface(&options, command, keyparm, facilitytime);

    endwin();

    if (is_first_instance)
	unlink(IPTIDFILE);

    return (0);
}