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ctrls.h
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/* * ProFTPD - FTP server daemon * Copyright (c) 2001-2011 The ProFTPD Project team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA. * * As a special exemption, Public Flood Software/MacGyver aka Habeeb J. Dihu * and other respective copyright holders give permission to link this program * with OpenSSL, and distribute the resulting executable, without including * the source code for OpenSSL in the source distribution. */ /* Controls API definitions * $Id: ctrls.h,v 1.8 2011/05/23 20:35:35 castaglia Exp $ */ #ifndef PR_CTRLS_H #define PR_CTRLS_H #include <sys/un.h> #include "conf.h" /* Controls API build-time necessities */ /* mode for control socket */ #define PR_CTRLS_MODE 0777 /* mode for client sockets */ #define PR_CTRLS_CL_MODE S_IRWXU /* Controls API objects */ /* Controls client object */ typedef struct cl_obj { struct cl_obj *cl_next, *cl_prev; /* Pool for this object's use */ pool *cl_pool; /* Client socket file descriptor */ int cl_fd; /* Credentials of the connecting client */ uid_t cl_uid; const char *cl_user; gid_t cl_gid; const char *cl_group; pid_t cl_pid; /* For internal use only */ volatile unsigned long cl_flags; /* Pointers to all controls matching client request */ array_header *cl_ctrls; } pr_ctrls_cl_t; /* Controls client flag values */ #define PR_CTRLS_CL_HAVEREQ 0x001 #define PR_CTRLS_CL_HAVERESP 0x002 #define PR_CTRLS_CL_NOACCESS 0x004 #define PR_CTRLS_CL_NOACTION 0x010 #define PR_CTRLS_CL_BLOCKED 0x020 /* Controls handler object */ typedef struct ctrls_obj { struct ctrls_obj *ctrls_next, *ctrls_prev; /* Object ID */ unsigned int ctrls_id; /* Registering module */ const module *ctrls_module; /* Requesting client */ pr_ctrls_cl_t *ctrls_cl; /* Control "action" */ const char *ctrls_action; /* Control trigger time. If 0, triggers immediately */ time_t ctrls_when; /* Simple description/help text */ const char *ctrls_desc; /* Temporary pool */ pool *ctrls_tmp_pool; /* Control handler callback */ int (*ctrls_cb)(struct ctrls_obj *, int, char **); /* Control handler callback arguments */ array_header *ctrls_cb_args; /* Control handler callback return value. Used to determine when to clear * this object from the requested list */ int ctrls_cb_retval; /* Control handler callback responses */ array_header *ctrls_cb_resps; /* For possibly passing data among control handlers */ void *ctrls_data; /* For internal use */ volatile unsigned long ctrls_flags; } pr_ctrls_t; #define PR_CTRLS_REQUESTED 0x00001 #define PR_CTRLS_HANDLED 0x00002 #define PR_CTRLS_PENDING 0x00004 #define PR_CTRLS_ACT_SOLITARY 0x00010 #define PR_CTRLS_ACT_DISABLED 0x00020 #define CTRLS_GET_ACTION_ALL 7 #define CTRLS_GET_ACTION_ENABLED 8 #define CTRLS_GET_DESC 9 /* Controls API prototypes */ /* Register a control handler for the given action with the Controls layer, * to be available to requesting clients. Returns the ID of the registered * handler, or -1 if there was an error. */ int pr_ctrls_register(const module *mod, const char *action, const char *desc, int (*ctrls_cb)(pr_ctrls_t *, int, char **)); /* Unregisters any control handlers that match the given module/action pair. * If the module argument is null, then the specified action for all modules * is unregistered. If the action argument is null, then all actions for the * specified module are unregistered. * * Returns 0 on success, -1 on failure. */ int pr_ctrls_unregister(module *mod, const char *action); /* Add the given ctrls_arg string to the pr_ctrls_t object's argument * array. Returns 0 on success, -1 on failure. */ int pr_ctrls_add_arg(pr_ctrls_t *ctrl, char *ctrls_arg); /* Add the given string to the pr_ctrls_t object's response array. Returns * 0 on success, -1 on failure. Control handlers can use this function to * add a text response to be returned to the requesting client. */ int pr_ctrls_add_response(pr_ctrls_t *ctrl, char *fmt, ...) #ifdef __GNUC__ __attribute__ ((format (printf, 2, 3))); #else ; #endif /* Meant for use in opening a client control socket, by ftpdctl and core * routines. Connects to the control socket, and returns the socket descriptor * opened, or -1 if there was an error. */ int pr_ctrls_connect(const char *socket_file); int pr_ctrls_copy_args(pr_ctrls_t *src_ctrl, pr_ctrls_t *dest_ctrl); int pr_ctrls_copy_resps(pr_ctrls_t *src_ctrl, pr_ctrls_t *dest_ctrl); /* Flush any responses added to the pr_ctrls_t out the client. This should * only be used when the control handler will not return (as when it is * going to end the process then and there). Returns -1 with errno set to * EINVAL if the given pointer is NULL, EPERM if unable to flush the responses * out to the client. Returns 0 on success. */ int pr_ctrls_flush_response(pr_ctrls_t *ctrl); /* Parses the given string into the argc, argv pointers, creating inputs * suitable for passing to pr_ctrls_send_msg(). The argv array of strings * is allocated from the given pool. Provided as a utility function. * Returns -1 on error, 0 if successful. */ int pr_ctrls_parse_msg(pool *msg_pool, char *msg, unsigned int *msgargc, char ***msgargv); /* Reads a client control request from the given client. Returns -1 with errno * set to EOF if there is nothing to read from the client socket, or errno set * to the appropriate error for other problems. Returns 0 on success. */ int pr_ctrls_recv_request(pr_ctrls_cl_t *cl); /* respargv can be NULL, as when the client does not care to know the * response messages, just that a response was successfully received. * Returns respargc, or -1 if there was an error. */ int pr_ctrls_recv_response(pool *resp_pool, int ctrls_sockfd, int *status, char ***respargv); /* Useful for core routines that themselves want to send a control message */ int pr_ctrls_send_msg(int sockfd, int msgstatus, unsigned int msgargc, char **msgargv); /* Determine whether the given socket mode is for a Unix domain socket. * Returns zero if true, -1 otherwise. */ int pr_ctrls_issock_unix(mode_t sock_mode); /* Accept a Controls connection. Returns the fd of the connected client * if successful, -1 (with errno set appropriately) otherwise. * * The optional uid, gid, and pid pointers, if provided, will be filled in * with the uid, gid, and pid of the connecting client process. These can * be used e.g. for access control checks. The max_age parameter specifies * the maximum age, in seconds, for the connecting client; this is used * for some types of credentials checking. */ int pr_ctrls_accept(int sockfd, uid_t *uid, gid_t *gid, pid_t *pid, unsigned int max_age); int pr_get_registered_actions(pr_ctrls_t *ctrl, int flags); int pr_set_registered_actions(module *mod, const char *action, unsigned char skip_disabled, unsigned int flags); /* Blocks ctrls from being run. */ void pr_block_ctrls(void); /* Unblocks ctrls from being run. */ void pr_unblock_ctrls(void); /* XXX */ int pr_check_actions(void); /* Iterate through the list of pr_ctrls_ts and invoke the callbacks of any * that match the given module and action arguments. Returns 0 if successful, * -1 if error (eg controls are blocked). */ int pr_run_ctrls(module *mod, const char *action); /* XXX */ int pr_reset_ctrls(void); /* For internal use only. */ void init_ctrls(void); #endif /* PR_CTRLS_H */