/* * Copyright (c) 1999-2003, 2006 Sendmail, Inc. and its suppliers. * All rights reserved. * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the sendmail distribution. */ /* ** LIBMILTER.H -- include file for mail filter library functions */ #ifndef _LIBMILTER_H # define _LIBMILTER_H 1 #include #ifdef _DEFINE # define EXTERN # define INIT(x) = x SM_IDSTR(MilterlId, "@(#)$Id: libmilter.h,v 8.77 2008/11/25 18:28:18 ca Exp $") #else /* _DEFINE */ # define EXTERN extern # define INIT(x) #endif /* _DEFINE */ #include "sm/tailq.h" #define NOT_SENDMAIL 1 #define _SOCK_ADDR union bigsockaddr #include "sendmail.h" #ifdef SM_ASSERT #undef SM_ASSERT #endif #ifndef SM_ASSERT #include #define SM_ASSERT(x) assert(x) #endif #include "libmilter/milter.h" #define MAX_MACROS_ENTRIES 7 /* max size of macro pointer array */ typedef SM_TAILQ_HEAD(, smfi_str) smfi_hd_T; typedef struct smfi_str smfi_str_S; /* ** Context for one milter session. ** ** Notes: ** There is a 1-1 correlation between a sendmail SMTP server process, ** an SMTP session, and an milter context. Due to the nature of SMTP ** session handling in sendmail 8, this libmilter implementation deals ** only with a single SMTP session per MTA - libmilter connection. ** ** There is no "global" context for libmilter, global variables are ** just that (they are not "collected" in a context). ** ** Implementation hint: ** macros are stored in mac_buf[] as sequence of: ** macro_name \0 macro_value ** (just as read from the MTA) ** mac_ptr is a list of pointers into mac_buf to the beginning of each ** entry, i.e., macro_name, macro_value, ... */ struct smfi_str { sthread_t ctx_id; /* thread id */ socket_t ctx_sd; /* socket descriptor */ int ctx_dbg; /* debug level */ time_t ctx_timeout; /* timeout */ int ctx_state; /* state */ smfiDesc_ptr ctx_smfi; /* filter description */ int ctx_prot_vers; /* libmilter protocol version */ unsigned long ctx_aflags; /* milter action flags */ unsigned long ctx_pflags; /* milter protocol flags */ /* ** milter protocol flags that are sent to the MTA; ** this is the same as ctx_pflags except for those flags that ** are not offered by the MTA but emulated in libmilter. */ unsigned long ctx_pflags2mta; /* ** milter protocol version that is sent to the MTA; ** this is the same as ctx_prot_vers unless the ** MTA protocol version (ctx_mta_prot_vers) is smaller ** but still "acceptable". */ int ctx_prot_vers2mta; char **ctx_mac_ptr[MAX_MACROS_ENTRIES]; char *ctx_mac_buf[MAX_MACROS_ENTRIES]; char *ctx_mac_list[MAX_MACROS_ENTRIES]; char *ctx_reply; /* reply code */ void *ctx_privdata; /* private data */ int ctx_mta_prot_vers; /* MTA protocol version */ unsigned long ctx_mta_pflags; /* MTA protocol flags */ unsigned long ctx_mta_aflags; /* MTA action flags */ #if _FFR_THREAD_MONITOR time_t ctx_start; /* start time of thread */ SM_TAILQ_ENTRY(smfi_str) ctx_mon_link; #endif /* _FFR_THREAD_MONITOR */ #if _FFR_WORKERS_POOL long ctx_sid; /* session identifier */ int ctx_wstate; /* state of the session (worker pool) */ int ctx_wait; /* elapsed time waiting for sm cmd */ SM_TAILQ_ENTRY(smfi_str) ctx_link; #endif /* _FFR_WORKERS_POOL */ }; # define ValidSocket(sd) ((sd) >= 0) # define INVALID_SOCKET (-1) # define closesocket close # define MI_SOCK_READ(s, b, l) read(s, b, l) # define MI_SOCK_READ_FAIL(x) ((x) < 0) # define MI_SOCK_WRITE(s, b, l) write(s, b, l) # define thread_create(ptid,wr,arg) pthread_create(ptid, NULL, wr, arg) # define sthread_get_id() pthread_self() typedef pthread_mutex_t smutex_t; # define smutex_init(mp) (pthread_mutex_init(mp, NULL) == 0) # define smutex_destroy(mp) (pthread_mutex_destroy(mp) == 0) # define smutex_lock(mp) (pthread_mutex_lock(mp) == 0) # define smutex_unlock(mp) (pthread_mutex_unlock(mp) == 0) # define smutex_trylock(mp) (pthread_mutex_trylock(mp) == 0) #if _FFR_WORKERS_POOL /* SM_CONF_POLL shall be defined with _FFR_WORKERS_POOL */ # if !SM_CONF_POLL # define SM_CONF_POLL 1 # endif /* SM_CONF_POLL */ #endif /* _FFR_WORKERS_POOL */ typedef pthread_cond_t scond_t; #define scond_init(cp) pthread_cond_init(cp, NULL) #define scond_destroy(cp) pthread_cond_destroy(cp) #define scond_wait(cp, mp) pthread_cond_wait(cp, mp) #define scond_signal(cp) pthread_cond_signal(cp) #define scond_broadcast(cp) pthread_cond_broadcast(cp) #define scond_timedwait(cp, mp, to) \ do \ { \ struct timespec timeout; \ struct timeval now; \ gettimeofday(&now, NULL); \ timeout.tv_sec = now.tv_sec + to; \ timeout.tv_nsec = now.tv_usec / 1000; \ r = pthread_cond_timedwait(cp,mp,&timeout); \ if (r != 0 && r != ETIMEDOUT) \ smi_log(SMI_LOG_ERR, \ "pthread_cond_timedwait error %d", r); \ } while (0) #if SM_CONF_POLL # include # define MI_POLLSELECT "poll" # define MI_POLL_RD_FLAGS (POLLIN | POLLPRI) # define MI_POLL_WR_FLAGS (POLLOUT) # define MI_MS(timeout) (((timeout)->tv_sec * 1000) + (timeout)->tv_usec) # define FD_RD_VAR(rds, excs) struct pollfd rds # define FD_WR_VAR(wrs) struct pollfd wrs # define FD_RD_INIT(sd, rds, excs) \ (rds).fd = (sd); \ (rds).events = MI_POLL_RD_FLAGS; \ (rds).revents = 0 # define FD_WR_INIT(sd, wrs) \ (wrs).fd = (sd); \ (wrs).events = MI_POLL_WR_FLAGS; \ (wrs).revents = 0 # define FD_IS_RD_EXC(sd, rds, excs) \ (((rds).revents & (POLLERR | POLLHUP | POLLNVAL)) != 0) # define FD_IS_WR_RDY(sd, wrs) \ (((wrs).revents & MI_POLL_WR_FLAGS) != 0) # define FD_IS_RD_RDY(sd, rds, excs) \ (((rds).revents & MI_POLL_RD_FLAGS) != 0) # define FD_WR_READY(sd, excs, timeout) \ poll(&(wrs), 1, MI_MS(timeout)) # define FD_RD_READY(sd, rds, excs, timeout) \ poll(&(rds), 1, MI_MS(timeout)) #else /* SM_CONF_POLL */ # include # define MI_POLLSELECT "select" # define FD_RD_VAR(rds, excs) fd_set rds, excs # define FD_WR_VAR(wrs) fd_set wrs # define FD_RD_INIT(sd, rds, excs) \ FD_ZERO(&(rds)); \ FD_SET((unsigned int) (sd), &(rds)); \ FD_ZERO(&(excs)); \ FD_SET((unsigned int) (sd), &(excs)) # define FD_WR_INIT(sd, wrs) \ FD_ZERO(&(wrs)); \ FD_SET((unsigned int) (sd), &(wrs)) # define FD_IS_RD_EXC(sd, rds, excs) FD_ISSET(sd, &(excs)) # define FD_IS_WR_RDY(sd, wrs) FD_ISSET((sd), &(wrs)) # define FD_IS_RD_RDY(sd, rds, excs) FD_ISSET((sd), &(rds)) # define FD_WR_READY(sd, wrs, timeout) \ select((sd) + 1, NULL, &(wrs), NULL, (timeout)) # define FD_RD_READY(sd, rds, excs, timeout) \ select((sd) + 1, &(rds), NULL, &(excs), (timeout)) #endif /* SM_CONF_POLL */ #include /* some defaults */ #define MI_TIMEOUT 7210 /* default timeout for read/write */ #define MI_CHK_TIME 5 /* checking whether to terminate */ #ifndef MI_SOMAXCONN # if SOMAXCONN > 20 # define MI_SOMAXCONN SOMAXCONN # else /* SOMAXCONN */ # define MI_SOMAXCONN 20 # endif /* SOMAXCONN */ #endif /* ! MI_SOMAXCONN */ /* maximum number of repeated failures in mi_listener() */ #define MAX_FAILS_M 16 /* malloc() */ #define MAX_FAILS_T 16 /* thread creation */ #define MAX_FAILS_A 16 /* accept() */ #define MAX_FAILS_S 16 /* select() */ /* internal "commands", i.e., error codes */ #define SMFIC_TIMEOUT ((char) 1) /* timeout */ #define SMFIC_SELECT ((char) 2) /* select error */ #define SMFIC_MALLOC ((char) 3) /* malloc error */ #define SMFIC_RECVERR ((char) 4) /* recv() error */ #define SMFIC_EOF ((char) 5) /* eof */ #define SMFIC_UNKNERR ((char) 6) /* unknown error */ #define SMFIC_TOOBIG ((char) 7) /* body chunk too big */ #define SMFIC_VALIDCMD ' ' /* first valid command */ /* hack */ #define smi_log syslog #define sm_dprintf (void) printf #define milter_ret int #define SMI_LOG_ERR LOG_ERR #define SMI_LOG_FATAL LOG_ERR #define SMI_LOG_WARN LOG_WARNING #define SMI_LOG_INFO LOG_INFO #define SMI_LOG_DEBUG LOG_DEBUG /* stop? */ #define MILTER_CONT 0 #define MILTER_STOP 1 #define MILTER_ABRT 2 /* functions */ extern int mi_handle_session __P((SMFICTX_PTR)); extern int mi_engine __P((SMFICTX_PTR)); extern int mi_listener __P((char *, int, smfiDesc_ptr, time_t, int)); extern void mi_clr_macros __P((SMFICTX_PTR, int)); extern void mi_clr_ctx __P((SMFICTX_PTR)); extern int mi_stop __P((void)); extern int mi_control_startup __P((char *)); extern void mi_stop_milters __P((int)); extern void mi_clean_signals __P((void)); extern struct hostent *mi_gethostbyname __P((char *, int)); extern int mi_inet_pton __P((int, const char *, void *)); extern void mi_closener __P((void)); extern int mi_opensocket __P((char *, int, int, bool, smfiDesc_ptr)); /* communication functions */ extern char *mi_rd_cmd __P((socket_t, struct timeval *, char *, size_t *, char *)); extern int mi_wr_cmd __P((socket_t, struct timeval *, int, char *, size_t)); extern bool mi_sendok __P((SMFICTX_PTR, int)); #if _FFR_THREAD_MONITOR extern bool Monitor; #define MI_MONITOR_INIT() mi_monitor_init() #define MI_MONITOR_BEGIN(ctx, cmd) \ do \ { \ if (Monitor) \ mi_monitor_work_begin(ctx, cmd);\ } while (0) #define MI_MONITOR_END(ctx, cmd) \ do \ { \ if (Monitor) \ mi_monitor_work_end(ctx, cmd); \ } while (0) int mi_monitor_init __P((void)); int mi_monitor_work_begin __P((SMFICTX_PTR, int)); int mi_monitor_work_end __P((SMFICTX_PTR, int)); #else /* _FFR_THREAD_MONITOR */ #define MI_MONITOR_INIT() MI_SUCCESS #define MI_MONITOR_BEGIN(ctx, cmd) #define MI_MONITOR_END(ctx, cmd) #endif /* _FFR_THREAD_MONITOR */ #if _FFR_WORKERS_POOL extern int mi_pool_manager_init __P((void)); extern int mi_pool_controller_init __P((void)); extern int mi_start_session __P((SMFICTX_PTR)); #endif /* _FFR_WORKERS_POOL */ #endif /* ! _LIBMILTER_H */