saidelike

/*
 * Structure describing compile-time and run-time options.
 */
struct sudo_defs_types {
    char *name;
    int type;
    char *desc;
    struct def_values *values;
    bool (*callback)(const union sudo_defs_val *);
    union sudo_defs_val sd_un;

saidelike

//sudo_1.8.23-9.el7/plugins/sudoers/def_data.c
struct sudo_defs_types sudo_defs_table[] = {
    {
        ...
    }, {
        "mailerpath", T_STR|T_BOOL|T_PATH,
        N_("Path to mail program: %s"),
        NULL,
    }, {
        "mailerflags", T_STR|T_BOOL,

saidelike

//sudo_1.8.23-9.el7/plugins/sudoers/def_data.h
#define I_MAILERPATH            39
#define def_mailerpath          (sudo_defs_table[I_MAILERPATH].sd_un.str)

saidelike

//sudo_1.8.23-9.el7/plugins/sudoers/logging.c
/*
 * Send a message to MAILTO user
 */
static bool
send_mail(const char *fmt, ...)
{
    ...
    /* If mailer is disabled just return. */
[0] if (!def_mailerpath || !def_mailto)