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/usr/include/pppd/cbcp.h is in ppp-dev 2.4.7-2+2ubuntu1.

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#ifndef CBCP_H
#define CBCP_H

typedef struct cbcp_state {
    int    us_unit;	/* Interface unit number */
    u_char us_id;		/* Current id */
    u_char us_allowed;
    int    us_type;
    char   *us_number;    /* Telefone Number */
} cbcp_state;

extern cbcp_state cbcp[];

extern struct protent cbcp_protent;

#define CBCP_MINLEN 4

#define CBCP_REQ    1
#define CBCP_RESP   2
#define CBCP_ACK    3

#define CB_CONF_NO     1
#define CB_CONF_USER   2
#define CB_CONF_ADMIN  3
#define CB_CONF_LIST   4
#endif