commands.c

linux 下 telnet源码

						env_varval,    1 },
#endif
    { "help",	0,				env_help,		0 },
    { "?",	"Print help information",	env_help,		0 },
    { 0 },
};

    static void
env_help()
{
    struct envlist *c;

    for (c = EnvList; c->name; c++) {
	if (c->help) {
	    if (*c->help)
		printf("%-15s %s\n", c->name, c->help);
	    else
		printf("\n");
	}
    }
}

    static struct envlist *
getenvcmd(name)
    char *name;
{
    return (struct envlist *)
		genget(name, (char **) EnvList, sizeof(struct envlist));
}

env_cmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct envlist *c;

    if (argc < 2) {
	fprintf(stderr,
	    "Need an argument to 'environ' command.  'environ ?' for help.\n");
	return 0;
    }
    c = getenvcmd(argv[1]);
    if (c == 0) {
	fprintf(stderr, "'%s': unknown argument ('environ ?' for help).\n",
    				argv[1]);
	return 0;
    }
    if (Ambiguous(c)) {
	fprintf(stderr, "'%s': ambiguous argument ('environ ?' for help).\n",
    				argv[1]);
	return 0;
    }
    if (c->narg + 2 != argc) {
	fprintf(stderr,
	    "Need %s%d argument%s to 'environ %s' command.  'environ ?' for help.\n",
		c->narg < argc + 2 ? "only " : "",
		c->narg, c->narg == 1 ? "" : "s", c->name);
	return 0;
    }
    (*c->handler)(argv[2], argv[3]);
    return 1;
}

struct env_lst {
	struct env_lst *next;	/* pointer to next structure */
	struct env_lst *prev;	/* pointer to previous structure */
	unsigned char *var;	/* pointer to variable name */
	unsigned char *value;	/* pointer to variable value */
	int export;		/* 1 -> export with default list of variables */
	int welldefined;	/* A well defined variable */
};

struct env_lst envlisthead;

	struct env_lst *
env_find(var)
	unsigned char *var;
{
	register struct env_lst *ep;

	for (ep = envlisthead.next; ep; ep = ep->next) {
		if (strcmp((char *)ep->var, (char *)var) == 0)
			return(ep);
	}
	return(NULL);
}

	void
env_init()
{
	extern char **environ;
	register char **epp, *cp;
	register struct env_lst *ep;
	extern char *strchr();

	for (epp = environ; *epp; epp++) {
		if (cp = strchr(*epp, '=')) {
			*cp = '\0';
			ep = env_define((unsigned char *)*epp,
					(unsigned char *)cp+1);
			ep->export = 0;
			*cp = '=';
		}
	}
	/*
	 * Special case for DISPLAY variable.  If it is ":0.0" or
	 * "unix:0.0", we have to get rid of "unix" and insert our
	 * hostname.
	 */
	if ((ep = env_find("DISPLAY"))
	    && ((*ep->value == ':')
		|| (strncmp((char *)ep->value, "unix:", 5) == 0))) {
		char hbuf[256+1];
		char *cp2 = strchr((char *)ep->value, ':');

		gethostname(hbuf, 256);
		hbuf[256] = '\0';
		cp = (char *)malloc(strlen(hbuf) + strlen(cp2) + 1);
		sprintf((char *)cp, "%s%s", hbuf, cp2);
		free(ep->value);
		ep->value = (unsigned char *)cp;
	}
	/*
	 * If USER is not defined, but LOGNAME is, then add
	 * USER with the value from LOGNAME.  By default, we
	 * don't export the USER variable.
	 */
	if ((env_find("USER") == NULL) && (ep = env_find("LOGNAME"))) {
		env_define((unsigned char *)"USER", ep->value);
		env_unexport((unsigned char *)"USER");
	}
	env_export((unsigned char *)"DISPLAY");
	env_export((unsigned char *)"PRINTER");
}

	struct env_lst *
env_define(var, value)
	unsigned char *var, *value;
{
	register struct env_lst *ep;

	if (ep = env_find(var)) {
		if (ep->var)
			free(ep->var);
		if (ep->value)
			free(ep->value);
	} else {
		ep = (struct env_lst *)malloc(sizeof(struct env_lst));
		ep->next = envlisthead.next;
		envlisthead.next = ep;
		ep->prev = &envlisthead;
		if (ep->next)
			ep->next->prev = ep;
	}
	ep->welldefined = opt_welldefined(var);
	ep->export = 1;
	ep->var = (unsigned char *)strdup((char *)var);
	ep->value = (unsigned char *)strdup((char *)value);
	return(ep);
}

	void
env_undefine(var)
	unsigned char *var;
{
	register struct env_lst *ep;

	if (ep = env_find(var)) {
		ep->prev->next = ep->next;
		if (ep->next)
			ep->next->prev = ep->prev;
		if (ep->var)
			free(ep->var);
		if (ep->value)
			free(ep->value);
		free(ep);
	}
}

	void
env_export(var)
	unsigned char *var;
{
	register struct env_lst *ep;

	if (ep = env_find(var))
		ep->export = 1;
}

	void
env_unexport(var)
	unsigned char *var;
{
	register struct env_lst *ep;

	if (ep = env_find(var))
		ep->export = 0;
}

	void
env_send(var)
	unsigned char *var;
{
	register struct env_lst *ep;

	if (my_state_is_wont(TELOPT_NEW_ENVIRON)
#ifdef	OLD_ENVIRON
	    && my_state_is_wont(TELOPT_OLD_ENVIRON)
#endif
		) {
		fprintf(stderr,
		    "Cannot send '%s': Telnet ENVIRON option not enabled\n",
									var);
		return;
	}
	ep = env_find(var);
	if (ep == 0) {
		fprintf(stderr, "Cannot send '%s': variable not defined\n",
									var);
		return;
	}
	env_opt_start_info();
	env_opt_add(ep->var);
	env_opt_end(0);
}

	void
env_list()
{
	register struct env_lst *ep;

	for (ep = envlisthead.next; ep; ep = ep->next) {
		printf("%c %-20s %s\n", ep->export ? '*' : ' ',
					ep->var, ep->value);
	}
}

	unsigned char *
env_default(init, welldefined)
	int init;
{
	static struct env_lst *nep = NULL;

	if (init) {
		nep = &envlisthead;
		return;
	}
	if (nep) {
		while (nep = nep->next) {
			if (nep->export && (nep->welldefined == welldefined))
				return(nep->var);
		}
	}
	return(NULL);
}

	unsigned char *
env_getvalue(var)
	unsigned char *var;
{
	register struct env_lst *ep;

	if (ep = env_find(var))
		return(ep->value);
	return(NULL);
}

#if defined(OLD_ENVIRON) && defined(ENV_HACK)
	void
env_varval(what)
	unsigned char *what;
{
	extern int old_env_var, old_env_value, env_auto;
	int len = strlen((char *)what);

	if (len == 0)
		goto unknown;

	if (strncasecmp((char *)what, "status", len) == 0) {
		if (env_auto)
			printf("%s%s", "VAR and VALUE are/will be ",
					"determined automatically\n");
		if (old_env_var == OLD_ENV_VAR)
			printf("VAR and VALUE set to correct definitions\n");
		else
			printf("VAR and VALUE definitions are reversed\n");
	} else if (strncasecmp((char *)what, "auto", len) == 0) {
		env_auto = 1;
		old_env_var = OLD_ENV_VALUE;
		old_env_value = OLD_ENV_VAR;
	} else if (strncasecmp((char *)what, "right", len) == 0) {
		env_auto = 0;
		old_env_var = OLD_ENV_VAR;
		old_env_value = OLD_ENV_VALUE;
	} else if (strncasecmp((char *)what, "wrong", len) == 0) {
		env_auto = 0;
		old_env_var = OLD_ENV_VALUE;
		old_env_value = OLD_ENV_VAR;
	} else {
unknown:
		printf("Unknown \"varval\" command. (\"auto\", \"right\", \"wrong\", \"status\")\n");
	}
}
#endif

#if	defined(AUTHENTICATION)
/*
 * The AUTHENTICATE command.
 */

struct authlist {
	char	*name;
	char	*help;
	int	(*handler)();
	int	narg;
};

extern int
	auth_enable P((char *)),
	auth_disable P((char *)),
	auth_status P((void));
static int
	auth_help P((void));

struct authlist AuthList[] = {
    { "status",	"Display current status of authentication information",
						auth_status,	0 },
    { "disable", "Disable an authentication type ('auth disable ?' for more)",
						auth_disable,	1 },
    { "enable", "Enable an authentication type ('auth enable ?' for more)",
						auth_enable,	1 },
    { "help",	0,				auth_help,		0 },
    { "?",	"Print help information",	auth_help,		0 },
    { 0 },
};

    static int
auth_help()
{
    struct authlist *c;

    for (c = AuthList; c->name; c++) {
	if (c->help) {
	    if (*c->help)
		printf("%-15s %s\n", c->name, c->help);
	    else
		printf("\n");
	}
    }
    return 0;
}

auth_cmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct authlist *c;

    if (argc < 2) {
	fprintf(stderr,
	    "Need an argument to 'auth' command.  'auth ?' for help.\n");
	return 0;
    }

    c = (struct authlist *)
		genget(argv[1], (char **) AuthList, sizeof(struct authlist));
    if (c == 0) {
	fprintf(stderr, "'%s': unknown argument ('auth ?' for help).\n",
    				argv[1]);
	return 0;
    }
    if (Ambiguous(c)) {
	fprintf(stderr, "'%s': ambiguous argument ('auth ?' for help).\n",
    				argv[1]);
	return 0;
    }
    if (c->narg + 2 != argc) {
	fprintf(stderr,
	    "Need %s%d argument%s to 'auth %s' command.  'auth ?' for help.\n",
		c->narg < argc + 2 ? "only " : "",
		c->narg, c->narg == 1 ? "" : "s", c->name);
	return 0;
    }
    return((*c->handler)(argv[2], argv[3]));
}
#endif

#ifdef	ENCRYPTION
/*
 * The ENCRYPT command.
 */

struct encryptlist {
	char	*name;
	char	*help;
	int	(*handler)();
	int	needconnect;
	int	minarg;
	int	maxarg;
};

extern int
	EncryptEnable P((char *, char *)),
	EncryptDisable P((char *, char *)),
	EncryptType P((char *, char *)),
	EncryptStart P((char *)),
	EncryptStartInput P((void)),
	EncryptStartOutput P((void)),
	EncryptStop P((char *)),
	EncryptStopInput P((void)),
	EncryptStopOutput P((void)),
	EncryptStatus P((void));
static int
	EncryptHelp P((void));

struct encryptlist EncryptList[] = {
    { "enable", "Enable encryption. ('encrypt enable ?' for more)",
						EncryptEnable, 1, 1, 2 },
    { "disable", "Disable encryption. ('encrypt enable ?' for more)",
						EncryptDisable, 0, 1, 2 },
    { "type", "Set encryption type. ('encrypt type ?' for more)",
						EncryptType, 0, 1, 1 },
    { "start", "Start encryption. ('encrypt start ?' for more)",
						EncryptStart, 1, 0, 1 },
    { "stop", "Stop encryption. ('encrypt stop ?' for more)",
						EncryptStop, 1, 0, 1 },
    { "input", "Start encrypting the input stream",
						EncryptStartInput, 1, 0, 0 },
    { "-input", "Stop encrypting the input stream",
						EncryptStopInput, 1, 0, 0 },
    { "output", "Start encrypting the output stream",
						EncryptStartOutput, 1, 0, 0 },
    { "-output", "Stop encrypting the output stream",
						EncryptStopOutput, 1, 0, 0 },

    { "status",	"Display current status of authentication information",
						EncryptStatus,	0, 0, 0 },
    { "help",	0,				EncryptHelp,	0, 0, 0 },
    { "?",	"Print help information",	EncryptHelp,	0, 0, 0 },
    { 0 },
};

    static int
EncryptHelp()
{
    struct encryptlist *c;

    for (c = EncryptList; c->name; c++) {
	if (c->help) {
	    if (*c->help)
		printf("%-15s %s\n", c->name, c->help);
	    else
		printf("\n");
	}
    }
    return 0;
}

encrypt_cmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct encryptlist *c;

    if (argc < 2) {
	fprintf(stderr,
	    "Need an argument to 'encrypt' command.  'encrypt ?' for help.\n");
	return 0;
    }

    c = (struct encryptlist *)
		genget(argv[1], (char **) EncryptList, sizeof(struct encryptlist));
    if (c == 0) {
	fprintf(stderr, "'%s': unknown argument ('encrypt ?' for help).\n",
    				argv[1]);
	return 0;
    }
    if (Ambiguous(c)) {
	fprintf(stderr, "'%s': ambiguous argument ('encrypt ?' for help).\n",
    				argv[1]);
	return 0;
    }
    argc -= 2;
    if (argc < c->minarg || argc > c->maxarg) {
	if (c->minarg == c->maxarg) {
	    fprintf(stderr, "Need %s%d argument%s ",
		c->minarg < argc ? "only " : "", c->minarg,
		c->minarg == 1 ? "" : "s");
	} else {
	    fprintf(stderr, "Need %s%d-%d arguments ",
		c->maxarg < argc ? "only " : "", c->minarg, c->maxarg);
	}
	fprintf(stderr, "to 'encrypt %s' command.  'encrypt ?' for help.\n",
		c->name);
	return 0;
    }
    if (c->needconnect && !connected) {
	if (!(argc && (isprefix(argv[2], "help") || isprefix(argv[2], "?")))) {
	    printf("?Need to be connected first.\n");
	    return 0;
	}
    }
    return ((*c->handler)(argc > 0 ? argv[2] : 0,
			argc > 1 ? argv[3] : 0,
			argc > 2 ? argv[4] : 0));
}
#endif	/* ENCRYPTION */

#if	defined(unix) && defined(TN3270)
    static void
filestuff(fd)
    int fd;
{
    int res;

#ifdef	F_GETOWN
    setconnmode(0);
    res = fcntl(fd, F_GETOWN, 0);
    setcommandmode();

    if (res == -1) {
	perror("fcntl");
	return;
    }
    printf("\tOwner is %d.\n", res);
#endif

    setconnmode(0);
    res = fcntl(fd, F_GETFL, 0);
    setcommandmode();

    if (res == -1) {
	perror("fcntl");