src/lib-master/master-service.h

	master-service.h revision cf0ad1a0bddb0787f3d7b408a96d721a8b2a98a3
#ifndef MASTER_SERVICE_H
#define MASTER_SERVICE_H

#include "network.h"

enum master_service_flags {
    /* stdin/stdout already contains a client which we want to serve */
    MASTER_SERVICE_FLAG_STD_CLIENT      = 0x01,
    /* this process is currently running standalone without a master */
    MASTER_SERVICE_FLAG_STANDALONE      = 0x02,
    /* Log to configured log file instead of stderr. By default when
       _FLAG_STANDALONE is set, logging is done to stderr. */
    MASTER_SERVICE_FLAG_DONT_LOG_TO_STDERR  = 0x04,
    /* Service is going to do multiple configuration lookups,
       keep the connection to config service open. */
    MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN    = 0x08,
    /* Don't read settings by executing config binary */
    MASTER_SERVICE_FLAG_NO_CONFIG_SETTINGS  = 0x10,
    /* Don't read settings from environment */
    MASTER_SERVICE_FLAG_NO_ENV_SETTINGS = 0x20,
    /* Use MASTER_LOGIN_NOTIFY_FD to track login overflow state */
    MASTER_SERVICE_FLAG_TRACK_LOGIN_STATE   = 0x40
};

struct master_service_connection {
    int fd;
    int listen_fd;

    struct ip_addr remote_ip;
    unsigned int remote_port;

    unsigned int fifo:1;
    unsigned int ssl:1;
};

typedef void
master_service_connection_callback_t(const struct master_service_connection *conn);

extern struct master_service *master_service;

const char *master_service_getopt_string(void);

/* Start service initialization. */
struct master_service *
master_service_init(const char *name, enum master_service_flags flags,
            int argc, char *argv[]);
/* Parser command line option. Returns TRUE if processed. */
bool master_service_parse_option(struct master_service *service,
                 int opt, const char *arg);
/* Finish service initialization. The caller should drop privileges
   before calling this. */
void master_service_init_finish(struct master_service *service);

/* Clean environment from everything except TZ, USER and optionally HOME. */
void master_service_env_clean(bool preserve_home);

/* Initialize logging. */
void master_service_init_log(struct master_service *service,
                 const char *prefix);

/* If set, die immediately when connection to master is lost.
   Normally all existing clients are handled first. */
void master_service_set_die_with_master(struct master_service *service,
                    bool set);
/* Call the given callback when there are no available connections and master
   has indicated that it can't create any more processes to handle requests.
   The callback could decide to kill one of the existing connections. */
void master_service_set_avail_overflow_callback(struct master_service *service,
                        void (*callback)(void));

/* Set maximum number of clients we can handle. Default is given by master. */
void master_service_set_client_limit(struct master_service *service,
                     unsigned int client_limit);
/* Returns the maximum number of clients we can handle. */
unsigned int master_service_get_client_limit(struct master_service *service);

/* Set maximum number of client connections we will handle before shutting
   down. */
void master_service_set_service_count(struct master_service *service,
                      unsigned int count);
/* Returns the number of client connections we will handle before shutting
   down. The value is decreased only after connection has been closed. */
unsigned int master_service_get_service_count(struct master_service *service);
/* Return the number of listener sockets. */
unsigned int master_service_get_socket_count(struct master_service *service);

/* Returns configuration file path. */
const char *master_service_get_config_path(struct master_service *service);
/* Returns PACKAGE_VERSION or NULL if version_ignore=yes. This function is
   useful mostly as parameter to module_dir_load(). */
const char *master_service_get_version_string(struct master_service *service);
/* Returns name of the service, as given in name parameter to _init(). */
const char *master_service_get_name(struct master_service *service);

/* Start the service. Blocks until finished */
void master_service_run(struct master_service *service,
            master_service_connection_callback_t *callback);
/* Stop a running service. */
void master_service_stop(struct master_service *service);

/* Send command to anvil process, if we have fd to it. */
void master_service_anvil_send(struct master_service *service, const char *cmd);
/* Call whenever a client connection is destroyed. */
void master_service_client_connection_destroyed(struct master_service *service);

/* Deinitialize the service. */
void master_service_deinit(struct master_service **service);

#endif