path: root/src/vty/vty.c

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <termios.h>

#include <sys/utsname.h>
#include <sys/param.h>

#include <arpa/telnet.h>

#include <osmocom/vty/vty.h>
#include <osmocom/vty/command.h>
#include <osmocom/vty/buffer.h>
#include <osmocore/talloc.h>

#define SYSCONFDIR "/usr/local/etc"

/* our callback, located in telnet_interface.c */
void vty_event(enum event event, int sock, struct vty *vty);

extern struct host host;

/* Vector which store each vty structure. */
static vector vtyvec;

vector Vvty_serv_thread;

char *vty_cwd = NULL;

/* Configure lock. */
static int vty_config;

static int no_password_check = 1;

void *tall_vty_ctx;

static void vty_clear_buf(struct vty *vty)
{
	memset(vty->buf, 0, vty->max);
}

/* Allocate new vty struct. */
struct vty *vty_new()
{
	struct vty *new = talloc_zero(tall_vty_ctx, struct vty);

	if (!new)
		goto out;

	new->obuf = buffer_new(new, 0);	/* Use default buffer size. */
	if (!new->obuf)
		goto out_new;
	new->buf = _talloc_zero(new, VTY_BUFSIZ, "vty_new->buf");
	if (!new->buf)
		goto out_obuf;

	new->max = VTY_BUFSIZ;

	return new;

out_obuf:
	buffer_free(new->obuf);
out_new:
	talloc_free(new);
	new = NULL;
out:
	return new;
}

/* Authentication of vty */
static void vty_auth(struct vty *vty, char *buf)
{
	char *passwd = NULL;
	enum node_type next_node = 0;
	int fail;
	char *crypt(const char *, const char *);

	switch (vty->node) {
	case AUTH_NODE:
#ifdef VTY_CRYPT_PW
		if (host.encrypt)
			passwd = host.password_encrypt;
		else
#endif
			passwd = host.password;
		if (host.advanced)
			next_node = host.enable ? VIEW_NODE : ENABLE_NODE;
		else
			next_node = VIEW_NODE;
		break;
	case AUTH_ENABLE_NODE:
#ifdef VTY_CRYPT_PW
		if (host.encrypt)
			passwd = host.enable_encrypt;
		else
#endif
			passwd = host.enable;
		next_node = ENABLE_NODE;
		break;
	}

	if (passwd) {
#ifdef VTY_CRYPT_PW
		if (host.encrypt)
			fail = strcmp(crypt(buf, passwd), passwd);
		else
#endif
			fail = strcmp(buf, passwd);
	} else
		fail = 1;

	if (!fail) {
		vty->fail = 0;
		vty->node = next_node;	/* Success ! */
	} else {
		vty->fail++;
		if (vty->fail >= 3) {
			if (vty->node == AUTH_NODE) {
				vty_out(vty,
					"%% Bad passwords, too many failures!%s",
					VTY_NEWLINE);
				vty->status = VTY_CLOSE;
			} else {
				/* AUTH_ENABLE_NODE */
				vty->fail = 0;
				vty_out(vty,
					"%% Bad enable passwords, too many failures!%s",
					VTY_NEWLINE);
				vty->node = VIEW_NODE;
			}
		}
	}
}

/* Close vty interface. */
void vty_close(struct vty *vty)
{
	int i;

	if (vty->obuf)  {
		/* Flush buffer. */
		buffer_flush_all(vty->obuf, vty->fd);

		/* Free input buffer. */
		buffer_free(vty->obuf);
		vty->obuf = NULL;
	}

	/* Free command history. */
	for (i = 0; i < VTY_MAXHIST; i++)
		if (vty->hist[i])
			talloc_free(vty->hist[i]);

	/* Unset vector. */
	vector_unset(vtyvec, vty->fd);

	/* Close socket. */
	if (vty->fd > 0)
		close(vty->fd);

	if (vty->buf) {
		talloc_free(vty->buf);
		vty->buf = NULL;
	}