tnet_check_account

#include <net_config.h>

U8 tnet_check_account (
    U8  code,        /* Defines the context for id parameter. */
    U8* id );        /* Username or Password entered in the client. */

The tnet_check_account function checks if an user account for provided credentials exist in the user database. It is called from the Telnet server of TCPnet to check if the user with provided credentials is allowed to access the Telnet server or not.

This function is called twice. On first call the argument code has a value of 0. The argument id is a pointer to the username.

In a second call to this function, the argument code is a nonzero value, representing user identification returned from the first call to this function. Argument id points to the password for this user. In both cases argument id points to a 0-terminated string.

The argument code specifies the meaning of the id argument:

The tnet_check_account function is in the Telnet_MultiUser.c module. The prototype is defined in net_config.h.

note

• This function is optional. For single user Telnet authentication or when the Telnet authentication is disabled from the configuration, this function is not required.

The tnet_check_account function returns the user identification number. If the user account does not exist, it should return 0.

tnet_get_user_id

/* Local variables. */
static const char *users[] = {
    "Dave",
    "Michael",
    "Guest"};

static const char *passwords[] = {
    "test1",
    "test2",
    ""};


U8 tnet_check_account (U8 code, U8 *id) {
  /* This function checks externally provided user account.  */
  int i;

  if (code == 0) {
    /* Check if the username is valid. */
    for (i = 0; i < 3; i++) {
      if (strcmp ((char *)id, users[i]) == 0) {
        /* Return user index + 1. */
        return (i+1);
      }
    }
  }
  else {
    /* Check the password for user identified with 'code' */
    if (strcmp ((char *)id, passwords[code-1]) == 0) {
      /* Return user identification if ok. */
      return (code);
    }
  }
  /* User account does not exist. */
  return (0);
}