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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2025 Free Software Foundation, Inc.
GNU Mailutils 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 3, or (at your option)
any later version.
GNU Mailutils 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _POP3D_H
#define _POP3D_H 1
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <mailutils/types.h>
#include <mailutils/stream.h>
#include <mailutils/io.h>
#include <mailutils/dbm.h>
#include <mu_umaxtostr.h>
#include <muaux.h>
/* The implementation */
#define IMPL "GNU POP3 Daemon"
#define PORT_POP3 110
#define PORT_POP3S 995
/* APOP password file, without .db or .passwd, which are added based on file
type automatically */
#define APOP_PASSFILE_NAME "apop"
#ifdef ENABLE_DBM
# define APOP_PASSFILE SYSCONFDIR "/" APOP_PASSFILE_NAME ".db"
# define ENABLE_LOGIN_DELAY
#else
# define APOP_PASSFILE SYSCONFDIR "/" APOP_PASSFILE_NAME ".passwd"
# undef ENABLE_LOGIN_DELAY
#endif
struct pop3d_session;
#ifdef ENABLE_LOGIN_DELAY
# define LOGIN_STAT_FILE "/var/run/pop3-login"
extern time_t login_delay;
extern char *login_stat_file;
extern int check_login_delay (char *username);
extern void update_login_delay (char *username);
extern void login_delay_capa (const char *, struct pop3d_session *);
#else
# define check_login_delay(u) 0
# define update_login_delay(u)
# define login_delay_capa NULL
#endif
/* Minimum advertise retention time for messages. */
extern unsigned expire;
extern int expire_on_exit;
#define EXPIRE_NEVER ((unsigned)-1)
/* Size of the MD5 digest for APOP */
#define APOP_DIGEST 70
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pwd.h>
#include <grp.h>
#include <syslog.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <sysexits.h>
#include <mailutils/alloc.h>
#include <mailutils/cctype.h>
#include <mailutils/cstr.h>
#include <mailutils/attribute.h>
#include <mailutils/body.h>
#include <mailutils/daemon.h>
#include <mailutils/errno.h>
#include <mailutils/error.h>
#include <mailutils/header.h>
#include <mailutils/list.h>
#include <mailutils/locker.h>
#include <mailutils/mailbox.h>
#include <mailutils/message.h>
#include <mailutils/util.h>
#include <mailutils/mu_auth.h>
#include <mailutils/nls.h>
#include <mailutils/registrar.h>
#include <mailutils/tls.h>
#include <mailutils/url.h>
#include <mailutils/md5.h>
#include <mailutils/acl.h>
#include <mailutils/server.h>
#include <mailutils/filter.h>
#include <mailutils/stdstream.h>
#include <mailutils/stream.h>
#include "mailutils/syslog.h"
/* For Berkley DB2 APOP password file */
#ifdef HAVE_DB_H
#include <db.h>
#endif
#ifdef HAVE_SECURITY_PAM_APPL_H
#include <security/pam_appl.h>
#endif
#ifdef HAVE_SHADOW_H
#include <shadow.h>
#endif
#define POP3_ATTRIBUTE_DELE 0x0001
#define POP3_ATTRIBUTE_RETR 0x0010
#define INITIAL -1
#define AUTHORIZATION 0
#define TRANSACTION 1
#define UPDATE 2
#define ABORT 3
enum pop3d_error {
OK = 0,
ERR_WRONG_STATE,
ERR_BAD_ARGS,
ERR_BAD_LOGIN,
ERR_NO_MESG,
ERR_MESG_DELE,
ERR_NOT_IMPL,
ERR_BAD_CMD,
ERR_MBOX_LOCK,
ERR_TOO_LONG,
ERR_NO_MEM,
ERR_SIGNAL,
ERR_FILE,
ERR_NO_IFILE,
ERR_NO_OFILE,
ERR_IO,
ERR_PROTO,
ERR_TIMEOUT,
ERR_UNKNOWN,
ERR_MBOX_SYNC,
ERR_TLS_IO,
ERR_LOGIN_DELAY,
ERR_TERMINATE,
ERR_SYS_LOGIN
};
enum tls_mode
{
tls_unspecified,
tls_no,
tls_ondemand,
tls_required,
tls_connection
};
enum pop3d_capa_type
{
capa_string,
capa_func
};
struct pop3d_capa
{
enum pop3d_capa_type type;
const char *name;
union
{
char *string;
void (*func) (const char *, struct pop3d_session *);
} value;
};
struct pop3d_session
{
mu_list_t capa;
enum tls_mode tls_mode;
struct mu_tls_config *tls_conf;
};
struct pop3d_srv_config
{
struct mu_srv_config m_cfg;
enum tls_mode tls_mode;
struct mu_tls_config tls_conf;
};
void pop3d_session_init (struct pop3d_session *session);
void pop3d_session_free (struct pop3d_session *session);
typedef struct mu_pop_server *mu_pop_server_t;
typedef int (*pop3d_command_handler_t) (char *, struct pop3d_session *sess);
struct pop3d_command
{
const char *name;
pop3d_command_handler_t handler;
};
extern mu_stream_t iostream;
extern mu_pop_server_t pop3srv;
extern mu_mailbox_t mbox;
extern int state;
extern int initial_state;
extern char *username;
extern char *maildir;
extern char *md5shared;
extern size_t children;
extern struct daemon_param daemon_param;
extern int debug_mode;
extern int undelete_on_startup;
extern struct mu_auth_data *auth_data;
extern unsigned int idle_timeout;
extern int pop3d_transcript;
extern size_t pop3d_output_bufsize;
extern int pop3d_xlines;
extern char *apop_database_name;
extern int apop_database_safety;
extern uid_t apop_database_owner;
extern int apop_database_owner_set;
extern struct mu_tls_config global_tls_conf;
extern int global_tls_mode;
/* Safety checks for group-rw database files, such as stat and bulletin
databases */
#define DEFAULT_GROUP_DB_SAFETY \
(MU_FILE_SAFETY_WORLD_WRITABLE| \
MU_FILE_SAFETY_WORLD_READABLE| \
MU_FILE_SAFETY_LINKED_WRDIR| \
MU_FILE_SAFETY_DIR_IWGRP| \
MU_FILE_SAFETY_DIR_IWOTH)
extern pop3d_command_handler_t pop3d_find_command (const char *name);
extern int pop3d_stat (char *, struct pop3d_session *);
extern int pop3d_top (char *, struct pop3d_session *);
extern int pop3d_uidl (char *, struct pop3d_session *);
extern int pop3d_user (char *, struct pop3d_session *);
extern int pop3d_apop (char *, struct pop3d_session *);
extern int pop3d_auth (char *, struct pop3d_session *);
extern int pop3d_capa (char *, struct pop3d_session *);
extern int pop3d_dele (char *, struct pop3d_session *);
extern int pop3d_list (char *, struct pop3d_session *);
extern int pop3d_noop (char *, struct pop3d_session *);
extern int pop3d_quit (char *, struct pop3d_session *);
extern int pop3d_retr (char *, struct pop3d_session *);
extern int pop3d_rset (char *, struct pop3d_session *);
void pop3d_send_payload (mu_stream_t stream, mu_stream_t linestr,
size_t maxlines);
extern void pop3d_bye (void);
extern int pop3d_abquit (int);
extern char *pop3d_apopuser (const char *);
extern int apop_ok (void);
extern void process_cleanup (void);
extern void pop3d_parse_command (char *cmd, char **pcmd, char **parg);
extern void pop3d_master_signal (int);
extern void pop3d_child_signal (int);
extern int pop3d_stls (char *, struct pop3d_session *);
int stls_preflight (mu_m_server_t msrv);
int stls_server_check (struct pop3d_srv_config *cfg, char const *srvid);
extern void pop3d_outf (const char *fmt, ...) MU_PRINTFLIKE(1,2);
extern void pop3d_setio (int, int, struct mu_tls_config *);
extern char *pop3d_readline (char *, size_t);
extern void pop3d_flush_output (void);
extern int pop3d_is_master (void);
extern void pop3d_mark_deleted (mu_attribute_t attr);
extern int pop3d_is_deleted (mu_attribute_t attr);
extern void pop3d_unset_deleted (mu_attribute_t attr);
void pop3d_undelete_all (void);
extern int pop3d_init_tls_server (struct mu_tls_config *tls_conf);
extern void pop3d_mark_retr (mu_attribute_t attr);
extern int pop3d_is_retr (mu_attribute_t attr);
extern void pop3d_unmark_retr (mu_attribute_t attr);
extern void expire_mark_message (mu_message_t msg, char **value);
extern void deliver_pending_bulletins (void);
extern void set_bulletin_db (const char *file);
extern int set_bulletin_source (const char *source);
extern int pop3d_begin_session (void);
extern const char *pop3d_error_string (int code);
extern int set_xscript_level (int xlev);
#endif /* _POP3D_H */
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