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/* * ProFTPD - FTP server daemon * Copyright (c) 1997, 1998 Public Flood Software * Copyright (c) 1999, 2000 MacGyver aka Habeeb J. Dihu <macgyver@tos.net> * Copyright (c) 2001-2016 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. */ /* ProFTPD module definitions. */ #ifndef PR_MODULES_H #define PR_MODULES_H typedef struct module_struc module; typedef struct modret_struc modret_t; struct modret_struc { module *mr_handler_module; /* which module handled this? */ int mr_error; /* !0 if error */ const char *mr_numeric; /* numeric error code */ const char *mr_message; /* text message */ void *data; /* add'l data -- undefined */ }; /* The following macros are for creating basic modret_t, and can * only be used inside of module handlers */ #define MODRET static modret_t* #define PR_HANDLED(cmd) mod_create_ret((cmd),\ 0,NULL,NULL) #define PR_DECLINED(cmd) (modret_t*)NULL #define PR_ERROR(cmd) mod_create_ret((cmd),\ 1,NULL,NULL) #define PR_ERROR_MSG(cmd,n,m) mod_create_ret((cmd),\ 1,(n),(m)) #define PR_ERROR_INT(cmd,n) mod_create_error((cmd),(n)) #define MODRET_ISDECLINED(x) ((x) == NULL) #define MODRET_ISHANDLED(x) ((x) && !(x)->mr_error) #define MODRET_ISERROR(x) ((x) && (x)->mr_error) #define MODRET_HASNUM(x) ((x) && (x)->mr_numeric) #define MODRET_HASMSG(x) ((x) && (x)->mr_message) #define MODRET_ERROR(x) ((x) ? (x)->mr_error : 0) #define MODRET_ERRNUM(x) ((x) ? (x)->mr_numeric : NULL) #define MODRET_ERRMSG(x) ((x) ? (x)->mr_message : NULL) #define MODRET_HASDATA(x) ((x) ? ((x)->data ? TRUE : FALSE) : FALSE) typedef struct conftab_rec { char *directive; modret_t *(*handler)(cmd_rec *); module *m; /* Reference to owning module * set when module is initialized */ } conftable; /* classes for command table */ #define CL_NONE 0x0 #define CL_AUTH (1 << 0) /* USER, PASS */ #define CL_INFO (1 << 1) /* Informational commands (PWD, SYST, etc) */ #define CL_DIRS (1 << 2) /* Directory commands (LIST, NLST, CWD, etc) */ #define CL_READ (1 << 3) /* File reading commands (RETR) */ #define CL_WRITE (1 << 4) /* Writing commands (STOR, MKD, etc) */ #define CL_MISC (1 << 5) /* Miscellaneous (RNFR/RNTO, SITE, etc) */ #define CL_SEC (1 << 6) /* RFC2228 Security commands */ #define CL_EXIT (1 << 7) /* Session exit */ #define CL_SSH (1 << 8) /* SSH requests */ #define CL_SFTP (1 << 9) /* SFTP requests */ /* Note that CL_ALL explicitly does NOT include CL_EXIT; this is to preserve * backward compatible behavior. */ #define CL_ALL (CL_AUTH|CL_INFO|CL_DIRS|CL_READ| \ CL_WRITE|CL_MISC|CL_SEC|CL_SSH|CL_SFTP) /* Command handler types for command table */ #define PRE_CMD 1 #define CMD 2 #define POST_CMD 3 #define POST_CMD_ERR 4 #define LOG_CMD 5 #define LOG_CMD_ERR 6 #define HOOK 7 typedef struct cmdtab_rec { /* See above for cmd types. */ unsigned char cmd_type; const char *command; /* Command group. */ const char *group; modret_t *(*handler)(cmd_rec *); /* Does this command require authentication? */ unsigned char requires_auth; /* Can this command be issued during a transfer? (Now obsolete) */ unsigned char interrupt_xfer; int cmd_class; module *m; } cmdtable; typedef struct authtab_rec { int auth_flags; /* future use */ const char *name; modret_t *(*handler)(cmd_rec *); module *m; } authtable; #define PR_AUTH_FL_REQUIRED 0x00001 struct module_struc { module *next, *prev; int api_version; /* API version _not_ module version */ const char *name; /* Module name */ struct conftab_rec *conftable; /* Configuration directive table */ struct cmdtab_rec *cmdtable; /* Command table */ struct authtab_rec *authtable; /* Authentication handler table */ int (*init)(void); /* Module initialization */ int (*sess_init)(void); /* Session initialization */ const char *module_version; /* Module version */ void *handle; /* Module handle */ /* Internal use; high number == higher priority. */ int priority; }; #define ANY_MODULE ((module*)0xffffffff) /* Prototypes */ unsigned char command_exists(const char *); int modules_init(void); void modules_list(int flags); void modules_list2(int (*listf)(const char *, ...), int flags); #define PR_MODULES_LIST_FL_SHOW_VERSION 0x00001 #define PR_MODULES_LIST_FL_SHOW_STATIC 0x00002 int modules_session_init(void); unsigned char pr_module_exists(const char *); module *pr_module_get(const char *); int pr_module_load(module *m); int pr_module_unload(module *m); /* Load the various symbol tables from this module. */ int pr_module_load_authtab(module *m); int pr_module_load_cmdtab(module *m); int pr_module_load_conftab(module *m); modret_t *pr_module_call(module *, modret_t *(*)(cmd_rec *), cmd_rec *); /* This function is in main.c, but is prototyped here */ void set_auth_check(int (*ck)(cmd_rec *)); /* This callback is defined/stored in src/main.c */ extern int (*cmd_auth_chk)(cmd_rec *); /* For use from inside module handler functions */ modret_t *mod_create_ret(cmd_rec *, unsigned char, const char *, const char *); modret_t *mod_create_error(cmd_rec *, int); modret_t *mod_create_data(cmd_rec *, void *); /* Implemented in mod_core.c */ int core_chgrp(cmd_rec *, const char *, uid_t, gid_t); int core_chmod(cmd_rec *, const char *, mode_t); #endif /* PR_MODULES_H */