1118 lines
24 KiB
C
1118 lines
24 KiB
C
/*
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* Copyright (c) 1999-2000 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*/
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#ifndef lint
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static char id[] = "@(#)$Id: engine.c,v 8.67.4.12 2000/07/14 06:16:57 msk Exp $";
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#endif /* ! lint */
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#if _FFR_MILTER
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#include "libmilter.h"
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#include "sendmail/useful.h"
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#if NETINET || NETINET6
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# include <arpa/inet.h>
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#endif /* NETINET || NETINET6 */
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/* generic argument for functions in the command table */
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struct arg_struct
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{
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size_t a_len; /* length of buffer */
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char *a_buf; /* argument string */
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int a_idx; /* index for macro array */
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SMFICTX_PTR a_ctx; /* context */
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};
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typedef struct arg_struct genarg;
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/* structure for commands received from MTA */
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struct cmdfct_t
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{
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char cm_cmd; /* command */
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int cm_argt; /* type of arguments expected */
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int cm_next; /* next state */
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int cm_todo; /* what to do next */
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int cm_macros; /* index for macros */
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int (*cm_fct) __P((genarg *)); /* function to execute */
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};
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typedef struct cmdfct_t cmdfct;
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/* possible values for cm_argt */
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#define CM_ARG0 0 /* no args */
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#define CM_ARG1 1 /* one arg (string) */
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#define CM_ARG2 2 /* two args (strings) */
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#define CM_ARGA 4 /* one string and _SOCK_ADDR */
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#define CM_ARGO 5 /* two integers */
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#define CM_ARGV 8 /* \0 separated list of args, NULL-terminated */
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#define CM_ARGN 9 /* \0 separated list of args (strings) */
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/* possible values for cm_todo */
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#define CT_CONT 0x0000 /* continue reading commands */
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#define CT_IGNO 0x0001 /* continue even when error */
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/* not needed right now, done via return code instead */
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#define CT_KEEP 0x0004 /* keep buffer (contains symbols) */
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#define CT_END 0x0008 /* start replying */
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/* index in macro array: macros only for these commands */
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#define CI_NONE (-1)
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#define CI_CONN 0
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#define CI_HELO 1
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#define CI_MAIL 2
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#define CI_RCPT 3
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#if CI_RCPT >= MAX_MACROS_ENTRIES
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ERROR: do not compile with CI_RCPT >= MAX_MACROS_ENTRIES
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#endif
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/* function prototypes */
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static int st_abortfct __P((genarg *));
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static int st_macros __P((genarg *));
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static int st_optionneg __P((genarg *));
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static int st_bodychunk __P((genarg *));
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static int st_connectinfo __P((genarg *));
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static int st_bodyend __P((genarg *));
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static int st_helo __P((genarg *));
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static int st_header __P((genarg *));
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static int st_sender __P((genarg *));
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static int st_rcpt __P((genarg *));
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static int st_eoh __P((genarg *));
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static int st_quit __P((genarg *));
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static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR));
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static void fix_stm __P((SMFICTX_PTR));
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static bool trans_ok __P((int, int));
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static char **dec_argv __P((char *, size_t));
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static int dec_arg2 __P((char *, size_t, char **, char **));
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/* states */
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#define ST_NONE (-1)
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#define ST_INIT 0 /* initial state */
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#define ST_OPTS 1 /* option negotiation */
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#define ST_CONN 2 /* connection info */
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#define ST_HELO 3 /* helo */
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#define ST_MAIL 4 /* mail from */
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#define ST_RCPT 5 /* rcpt to */
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#define ST_HDRS 6 /* headers */
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#define ST_EOHS 7 /* end of headers */
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#define ST_BODY 8 /* body */
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#define ST_ENDM 9 /* end of message */
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#define ST_QUIT 10 /* quit */
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#define ST_ABRT 11 /* abort */
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#define ST_LAST ST_ABRT
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#define ST_SKIP 15 /* not a state but required for the state table */
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/* in a mail transaction? must be before eom according to spec. */
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#define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM)
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/*
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** set of next states
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** each state (ST_*) corresponds to bit in an int value (1 << state)
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** each state has a set of allowed transitions ('or' of bits of states)
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** so a state transition is valid if the mask of the next state
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** is set in the NX_* value
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** this function is coded in trans_ok(), see below.
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*/
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#define MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */
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#define NX_INIT (MASK(ST_OPTS))
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#define NX_OPTS (MASK(ST_CONN))
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#define NX_CONN (MASK(ST_HELO) | MASK(ST_MAIL))
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#define NX_HELO (MASK(ST_MAIL))
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#define NX_MAIL (MASK(ST_RCPT) | MASK(ST_ABRT))
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#define NX_RCPT (MASK(ST_HDRS) | MASK(ST_EOHS) | MASK(ST_RCPT) | MASK(ST_ABRT))
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#define NX_HDRS (MASK(ST_EOHS) | MASK(ST_HDRS) | MASK(ST_ABRT))
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#define NX_EOHS (MASK(ST_BODY) | MASK(ST_ENDM) | MASK(ST_ABRT))
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#define NX_BODY (MASK(ST_ENDM) | MASK(ST_BODY) | MASK(ST_ABRT))
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#define NX_ENDM (MASK(ST_QUIT) | MASK(ST_MAIL))
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#define NX_QUIT 0
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#define NX_ABRT 0
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#define NX_SKIP MASK(ST_SKIP)
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static int next_states[] =
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{
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NX_INIT,
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NX_OPTS,
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NX_CONN,
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NX_HELO,
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NX_MAIL,
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NX_RCPT,
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NX_HDRS,
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NX_EOHS,
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NX_BODY,
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NX_ENDM,
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NX_QUIT,
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NX_ABRT
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};
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/* commands received by milter */
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static cmdfct cmds[] =
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{
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{SMFIC_ABORT, CM_ARG0, ST_ABRT, CT_CONT, CI_NONE, st_abortfct },
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{SMFIC_MACRO, CM_ARGV, ST_NONE, CT_KEEP, CI_NONE, st_macros },
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{SMFIC_BODY, CM_ARG1, ST_BODY, CT_CONT, CI_NONE, st_bodychunk },
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{SMFIC_CONNECT, CM_ARG2, ST_CONN, CT_CONT, CI_CONN, st_connectinfo },
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{SMFIC_BODYEOB, CM_ARG1, ST_ENDM, CT_CONT, CI_NONE, st_bodyend },
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{SMFIC_HELO, CM_ARG1, ST_HELO, CT_CONT, CI_HELO, st_helo },
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{SMFIC_HEADER, CM_ARG2, ST_HDRS, CT_CONT, CI_NONE, st_header },
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{SMFIC_MAIL, CM_ARGV, ST_MAIL, CT_CONT, CI_MAIL, st_sender },
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{SMFIC_OPTNEG, CM_ARGO, ST_OPTS, CT_CONT, CI_NONE, st_optionneg },
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{SMFIC_EOH, CM_ARG0, ST_EOHS, CT_CONT, CI_NONE, st_eoh },
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{SMFIC_QUIT, CM_ARG0, ST_QUIT, CT_END, CI_NONE, st_quit },
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{SMFIC_RCPT, CM_ARGV, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt }
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};
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/* additional (internal) reply codes */
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#define _SMFIS_KEEP 20
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#define _SMFIS_ABORT 21
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#define _SMFIS_OPTIONS 22
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#define _SMFIS_NOREPLY 23
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#define _SMFIS_FAIL (-1)
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/*
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** MI_ENGINE -- receive commands and process them
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**
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** Parameters:
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** ctx -- context structure
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**
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** Returns:
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** MI_FAILURE/MI_SUCCESS
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*/
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int
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mi_engine(ctx)
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SMFICTX_PTR ctx;
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{
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size_t len;
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int i;
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socket_t sd;
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int ret = MI_SUCCESS;
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int ncmds = sizeof(cmds) / sizeof(cmdfct);
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int curstate = ST_INIT;
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int newstate;
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bool call_abort;
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sfsistat r;
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char cmd;
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char *buf = NULL;
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genarg arg;
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struct timeval timeout;
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int (*f) __P((genarg *));
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sfsistat (*fi_abort) __P((SMFICTX *));
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sfsistat (*fi_close) __P((SMFICTX *));
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arg.a_ctx = ctx;
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sd = ctx->ctx_sd;
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fi_abort = ctx->ctx_smfi->xxfi_abort;
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mi_clr_macros(ctx, 0);
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fix_stm(ctx);
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do {
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/* call abort only if in a mail transaction */
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call_abort = ST_IN_MAIL(curstate);
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timeout.tv_sec = ctx->ctx_timeout;
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timeout.tv_usec = 0;
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if (mi_stop() == MILTER_ABRT)
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{
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if (ctx->ctx_dbg > 3)
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dprintf("[%d] milter_abort\n",
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(int) ctx->ctx_id);
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ret = MI_FAILURE;
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break;
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}
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if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len,
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ctx->ctx_smfi->xxfi_name)) == NULL &&
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cmd < SMFIC_VALIDCMD)
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{
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if (ctx->ctx_dbg > 5)
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dprintf("[%d] error (%x)\n",
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(int) ctx->ctx_id, (int) cmd);
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/*
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** eof is currently treated as failure ->
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** abort() instead of close(), otherwise use:
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** if (cmd != SMFIC_EOF)
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*/
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ret = MI_FAILURE;
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break;
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}
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if (ctx->ctx_dbg > 4)
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dprintf("[%d] got cmd '%c' len %d\n",
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(int) ctx->ctx_id, cmd, len);
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for (i = 0; i < ncmds; i++)
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{
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if (cmd == cmds[i].cm_cmd)
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break;
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}
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if (i >= ncmds)
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{
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/* unknown command */
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if (ctx->ctx_dbg > 1)
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dprintf("[%d] cmd '%c' unknown\n",
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(int) ctx->ctx_id, cmd);
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ret = MI_FAILURE;
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break;
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}
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if ((f = cmds[i].cm_fct) == NULL)
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{
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/* stop for now */
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if (ctx->ctx_dbg > 1)
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dprintf("[%d] cmd '%c' not impl\n",
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(int) ctx->ctx_id, cmd);
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ret = MI_FAILURE;
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break;
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}
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/* is new state ok? */
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newstate = cmds[i].cm_next;
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if (ctx->ctx_dbg > 5)
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dprintf("[%d] cur %x new %x nextmask %x\n",
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(int) ctx->ctx_id,
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curstate, newstate, next_states[curstate]);
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if (newstate != ST_NONE && !trans_ok(curstate, newstate))
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{
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if (ctx->ctx_dbg > 1)
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dprintf("[%d] abort: cur %d (%x) new %d (%x) next %x\n",
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(int) ctx->ctx_id,
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curstate, MASK(curstate),
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newstate, MASK(newstate),
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next_states[curstate]);
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/* call abort only if in a mail transaction */
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if (fi_abort != NULL && call_abort)
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(void) (*fi_abort)(ctx);
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/*
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** try to reach the new state from HELO
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** if it can't be reached, ignore the command.
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*/
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curstate = ST_HELO;
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if (!trans_ok(curstate, newstate))
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continue;
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}
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arg.a_len = len;
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arg.a_buf = buf;
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if (newstate != ST_NONE)
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{
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curstate = newstate;
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ctx->ctx_state = curstate;
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}
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arg.a_idx = cmds[i].cm_macros;
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/* call function to deal with command */
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r = (*f)(&arg);
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if (r != _SMFIS_KEEP && buf != NULL)
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{
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free(buf);
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buf = NULL;
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}
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if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS)
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{
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ret = MI_FAILURE;
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break;
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}
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call_abort = ST_IN_MAIL(curstate);
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if (r == SMFIS_ACCEPT)
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{
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/* accept mail, no further actions taken */
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curstate = ST_HELO;
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}
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else if (r == SMFIS_REJECT || r == SMFIS_DISCARD ||
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r == SMFIS_TEMPFAIL)
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{
|
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/*
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** further actions depend on current state
|
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** if the IGNO bit is set: "ignore" the error,
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** i.e., stay in the current state
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*/
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if (!bitset(CT_IGNO, cmds[i].cm_todo))
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curstate = ST_HELO;
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}
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else if (r == _SMFIS_ABORT)
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{
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if (ctx->ctx_dbg > 5)
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dprintf("[%d] function returned abort\n",
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(int) ctx->ctx_id);
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ret = MI_FAILURE;
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break;
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}
|
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} while (!bitset(CT_END, cmds[i].cm_todo));
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||
|
||
if (ret != MI_SUCCESS)
|
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{
|
||
/* call abort only if in a mail transaction */
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if (fi_abort != NULL && call_abort)
|
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(void) (*fi_abort)(ctx);
|
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}
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||
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/* close must always be called */
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if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL)
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(void) (*fi_close)(ctx);
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if (buf != NULL)
|
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free(buf);
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mi_clr_macros(ctx, 0);
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return ret;
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}
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/*
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** SENDREPLY -- send a reply to the MTA
|
||
**
|
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** Parameters:
|
||
** r -- reply code
|
||
** sd -- socket descriptor
|
||
** timeout_ptr -- (ptr to) timeout to use for sending
|
||
** ctx -- context structure
|
||
**
|
||
** Returns:
|
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** MI_SUCCESS/MI_FAILURE
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*/
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static int
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sendreply(r, sd, timeout_ptr, ctx)
|
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sfsistat r;
|
||
socket_t sd;
|
||
struct timeval *timeout_ptr;
|
||
SMFICTX_PTR ctx;
|
||
{
|
||
int ret = MI_SUCCESS;
|
||
|
||
switch(r)
|
||
{
|
||
case SMFIS_CONTINUE:
|
||
ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 0);
|
||
break;
|
||
case SMFIS_TEMPFAIL:
|
||
case SMFIS_REJECT:
|
||
if (ctx->ctx_reply != NULL)
|
||
{
|
||
ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_REPLYCODE,
|
||
ctx->ctx_reply,
|
||
strlen(ctx->ctx_reply) + 1);
|
||
free(ctx->ctx_reply);
|
||
ctx->ctx_reply = NULL;
|
||
}
|
||
else
|
||
{
|
||
ret = mi_wr_cmd(sd, timeout_ptr, r == SMFIS_REJECT ?
|
||
SMFIR_REJECT : SMFIR_TEMPFAIL, NULL, 0);
|
||
}
|
||
break;
|
||
case SMFIS_DISCARD:
|
||
ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_DISCARD, NULL, 0);
|
||
break;
|
||
case SMFIS_ACCEPT:
|
||
ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_ACCEPT, NULL, 0);
|
||
break;
|
||
case _SMFIS_OPTIONS:
|
||
{
|
||
char buf[MILTER_OPTLEN];
|
||
mi_int32 v;
|
||
|
||
v = htonl(ctx->ctx_smfi->xxfi_version);
|
||
(void) memcpy(&(buf[0]), (void *) &v, MILTER_LEN_BYTES);
|
||
v = htonl(ctx->ctx_smfi->xxfi_flags);
|
||
(void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v,
|
||
MILTER_LEN_BYTES);
|
||
v = htonl(ctx->ctx_pflags);
|
||
(void) memcpy(&(buf[MILTER_LEN_BYTES * 2]), (void *) &v,
|
||
MILTER_LEN_BYTES);
|
||
ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG, buf,
|
||
MILTER_OPTLEN);
|
||
}
|
||
break;
|
||
default: /* don't send a reply */
|
||
break;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
/*
|
||
** CLR_MACROS -- clear set of macros starting from a given index
|
||
**
|
||
** Parameters:
|
||
** ctx -- context structure
|
||
** m -- index from which to clear all macros
|
||
**
|
||
** Returns:
|
||
** None.
|
||
*/
|
||
void
|
||
mi_clr_macros(ctx, m)
|
||
SMFICTX_PTR ctx;
|
||
int m;
|
||
{
|
||
int i;
|
||
|
||
for (i = m; i < MAX_MACROS_ENTRIES; i++)
|
||
{
|
||
if (ctx->ctx_mac_ptr[i] != NULL)
|
||
{
|
||
free(ctx->ctx_mac_ptr[i]);
|
||
ctx->ctx_mac_ptr[i] = NULL;
|
||
}
|
||
if (ctx->ctx_mac_buf[i] != NULL)
|
||
{
|
||
free(ctx->ctx_mac_buf[i]);
|
||
ctx->ctx_mac_buf[i] = NULL;
|
||
}
|
||
}
|
||
}
|
||
/*
|
||
** ST_OPTIONNEG -- negotiate options
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** abort/send options/continue
|
||
*/
|
||
|
||
static int
|
||
st_optionneg(g)
|
||
genarg *g;
|
||
{
|
||
mi_int32 i, v;
|
||
|
||
if (g == NULL || g->a_ctx->ctx_smfi == NULL)
|
||
return SMFIS_CONTINUE;
|
||
mi_clr_macros(g->a_ctx, g->a_idx + 1);
|
||
|
||
/* check for minimum length */
|
||
if (g->a_len < MILTER_OPTLEN)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: st_optionneg[%d]: len too short %d < %d",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id, g->a_len,
|
||
MILTER_OPTLEN);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
|
||
(void) memcpy((void *) &i, (void *) &(g->a_buf[0]),
|
||
MILTER_LEN_BYTES);
|
||
v = ntohl(i);
|
||
if (v < g->a_ctx->ctx_smfi->xxfi_version)
|
||
{
|
||
/* hard failure for now! */
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: st_optionneg[%d]: version mismatch MTA: %d < milter: %d",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id, (int) v,
|
||
g->a_ctx->ctx_smfi->xxfi_version);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
|
||
(void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES]),
|
||
MILTER_LEN_BYTES);
|
||
v = ntohl(i);
|
||
|
||
/* no flags? set to default value for V1 actions */
|
||
if (v == 0)
|
||
v = SMFI_V1_ACTS;
|
||
i = g->a_ctx->ctx_smfi->xxfi_flags;
|
||
if ((v & i) != i)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: st_optionneg[%d]: 0x%x does not fulfill action requirements 0x%x",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id, v, i);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
|
||
(void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES * 2]),
|
||
MILTER_LEN_BYTES);
|
||
v = ntohl(i);
|
||
|
||
/* no flags? set to default value for V1 protocol */
|
||
if (v == 0)
|
||
v = SMFI_V1_PROT;
|
||
i = g->a_ctx->ctx_pflags;
|
||
if ((v & i) != i)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: st_optionneg[%d]: 0x%x does not fulfill protocol requirements 0x%x",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id, v, i);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
|
||
return _SMFIS_OPTIONS;
|
||
}
|
||
/*
|
||
** ST_CONNECTINFO -- receive connection information
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_connectinfo(g)
|
||
genarg *g;
|
||
{
|
||
size_t l;
|
||
size_t i;
|
||
char *s, family;
|
||
u_short port = 0;
|
||
_SOCK_ADDR sockaddr;
|
||
sfsistat (*fi_connect) __P((SMFICTX *, char *, _SOCK_ADDR *));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
mi_clr_macros(g->a_ctx, g->a_idx + 1);
|
||
if (g->a_ctx->ctx_smfi == NULL ||
|
||
(fi_connect = g->a_ctx->ctx_smfi->xxfi_connect) == NULL)
|
||
return SMFIS_CONTINUE;
|
||
|
||
s = g->a_buf;
|
||
i = 0;
|
||
l = g->a_len;
|
||
while (s[i] != '\0' && i <= l)
|
||
++i;
|
||
if (i >= l)
|
||
return _SMFIS_ABORT;
|
||
|
||
/* Move past trailing \0 in host string */
|
||
i++;
|
||
family = s[i++];
|
||
memset(&sockaddr, '\0', sizeof sockaddr);
|
||
if (family != SMFIA_UNKNOWN)
|
||
{
|
||
(void) memcpy((void *) &port, (void *) (s + i),
|
||
sizeof port);
|
||
port = ntohs(port);
|
||
if ((i += sizeof port) >= l)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: connect[%d]: wrong len %d >= %d",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id, i, l);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
# if NETINET
|
||
if (family == SMFIA_INET)
|
||
{
|
||
if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr)
|
||
== INADDR_NONE)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: connect[%d]: inet_aton failed",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
sockaddr.sa.sa_family = AF_INET;
|
||
if (port > 0)
|
||
sockaddr.sin.sin_port = port;
|
||
}
|
||
else
|
||
# endif /* NETINET */
|
||
# if NETINET6
|
||
if (family == SMFIA_INET6)
|
||
{
|
||
if (inet_pton(AF_INET6, s + i,
|
||
&sockaddr.sin6.sin6_addr) != 1)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: connect[%d]: inet_pton failed",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
sockaddr.sa.sa_family = AF_INET6;
|
||
if (port > 0)
|
||
sockaddr.sin6.sin6_port = port;
|
||
}
|
||
else
|
||
# endif /* NETINET6 */
|
||
# if NETUNIX
|
||
if (family == SMFIA_UNIX)
|
||
{
|
||
if (strlcpy(sockaddr.sunix.sun_path, s + i,
|
||
sizeof sockaddr.sunix.sun_path) >=
|
||
sizeof sockaddr.sunix.sun_path)
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: connect[%d]: path too long",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
sockaddr.sunix.sun_family = AF_UNIX;
|
||
}
|
||
else
|
||
# endif /* NETUNIX */
|
||
{
|
||
smi_log(SMI_LOG_ERR,
|
||
"%s: connect[%d]: unknown family %d",
|
||
g->a_ctx->ctx_smfi->xxfi_name,
|
||
(int) g->a_ctx->ctx_id, family);
|
||
return _SMFIS_ABORT;
|
||
}
|
||
}
|
||
return (*fi_connect)(g->a_ctx, g->a_buf,
|
||
family != SMFIA_UNKNOWN ? &sockaddr : NULL);
|
||
}
|
||
/*
|
||
** ST_EOH -- end of headers
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_eoh(g)
|
||
genarg *g;
|
||
{
|
||
sfsistat (*fi_eoh) __P((SMFICTX *));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
if (g->a_ctx->ctx_smfi != NULL &&
|
||
(fi_eoh = g->a_ctx->ctx_smfi->xxfi_eoh) != NULL)
|
||
return (*fi_eoh)(g->a_ctx);
|
||
return SMFIS_CONTINUE;
|
||
}
|
||
/*
|
||
** ST_HELO -- helo/ehlo command
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
static int
|
||
st_helo(g)
|
||
genarg *g;
|
||
{
|
||
sfsistat (*fi_helo) __P((SMFICTX *, char *));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
mi_clr_macros(g->a_ctx, g->a_idx + 1);
|
||
if (g->a_ctx->ctx_smfi != NULL &&
|
||
(fi_helo = g->a_ctx->ctx_smfi->xxfi_helo) != NULL)
|
||
return (*fi_helo)(g->a_ctx, g->a_buf);
|
||
return SMFIS_CONTINUE;
|
||
}
|
||
/*
|
||
** ST_HEADER -- header line
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_header(g)
|
||
genarg *g;
|
||
{
|
||
char *hf, *hv;
|
||
sfsistat (*fi_header) __P((SMFICTX *, char *, char *));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
if (g->a_ctx->ctx_smfi == NULL ||
|
||
(fi_header = g->a_ctx->ctx_smfi->xxfi_header) == NULL)
|
||
return SMFIS_CONTINUE;
|
||
if (dec_arg2(g->a_buf, g->a_len, &hf, &hv) == MI_SUCCESS)
|
||
return (*fi_header)(g->a_ctx, hf, hv);
|
||
else
|
||
return _SMFIS_ABORT;
|
||
}
|
||
|
||
#define ARGV_FCT(lf, rf, idx) \
|
||
char **argv; \
|
||
sfsistat (*lf) __P((SMFICTX *, char **)); \
|
||
int r; \
|
||
\
|
||
if (g == NULL) \
|
||
return _SMFIS_ABORT; \
|
||
mi_clr_macros(g->a_ctx, g->a_idx + 1); \
|
||
if (g->a_ctx->ctx_smfi == NULL || \
|
||
(lf = g->a_ctx->ctx_smfi->rf) == NULL) \
|
||
return SMFIS_CONTINUE; \
|
||
if ((argv = dec_argv(g->a_buf, g->a_len)) == NULL) \
|
||
return _SMFIS_ABORT; \
|
||
r = (*lf)(g->a_ctx, argv); \
|
||
free(argv); \
|
||
return r;
|
||
|
||
/*
|
||
** ST_SENDER -- MAIL FROM command
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_sender(g)
|
||
genarg *g;
|
||
{
|
||
ARGV_FCT(fi_envfrom, xxfi_envfrom, CI_MAIL)
|
||
}
|
||
/*
|
||
** ST_RCPT -- RCPT TO command
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_rcpt(g)
|
||
genarg *g;
|
||
{
|
||
ARGV_FCT(fi_envrcpt, xxfi_envrcpt, CI_RCPT)
|
||
}
|
||
/*
|
||
** ST_MACROS -- deal with macros received from the MTA
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue/keep
|
||
**
|
||
** Side effects:
|
||
** set pointer in macro array to current values.
|
||
*/
|
||
|
||
static int
|
||
st_macros(g)
|
||
genarg *g;
|
||
{
|
||
int i;
|
||
char **argv;
|
||
|
||
if (g == NULL || g->a_len < 1)
|
||
return _SMFIS_FAIL;
|
||
if ((argv = dec_argv(g->a_buf + 1, g->a_len - 1)) == NULL)
|
||
return _SMFIS_FAIL;
|
||
switch(g->a_buf[0])
|
||
{
|
||
case SMFIC_CONNECT:
|
||
i = CI_CONN;
|
||
break;
|
||
case SMFIC_HELO:
|
||
i = CI_HELO;
|
||
break;
|
||
case SMFIC_MAIL:
|
||
i = CI_MAIL;
|
||
break;
|
||
case SMFIC_RCPT:
|
||
i = CI_RCPT;
|
||
break;
|
||
default:
|
||
free(argv);
|
||
return _SMFIS_FAIL;
|
||
}
|
||
if (g->a_ctx->ctx_mac_ptr[i] != NULL)
|
||
free(g->a_ctx->ctx_mac_ptr[i]);
|
||
if (g->a_ctx->ctx_mac_buf[i] != NULL)
|
||
free(g->a_ctx->ctx_mac_buf[i]);
|
||
g->a_ctx->ctx_mac_ptr[i] = argv;
|
||
g->a_ctx->ctx_mac_buf[i] = g->a_buf;
|
||
return _SMFIS_KEEP;
|
||
}
|
||
/*
|
||
** ST_QUIT -- quit command
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** noreply
|
||
*/
|
||
|
||
static int
|
||
st_quit(g)
|
||
genarg *g;
|
||
{
|
||
return _SMFIS_NOREPLY;
|
||
}
|
||
/*
|
||
** ST_BODYCHUNK -- deal with a piece of the mail body
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_bodychunk(g)
|
||
genarg *g;
|
||
{
|
||
sfsistat (*fi_body) __P((SMFICTX *, u_char *, size_t));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
if (g->a_ctx->ctx_smfi != NULL &&
|
||
(fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL)
|
||
return (*fi_body)(g->a_ctx, (u_char *)g->a_buf, g->a_len);
|
||
return SMFIS_CONTINUE;
|
||
}
|
||
/*
|
||
** ST_BODYEND -- deal with the last piece of the mail body
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** continue or filter-specified value
|
||
**
|
||
** Side effects:
|
||
** sends a reply for the body part (if non-empty).
|
||
*/
|
||
|
||
static int
|
||
st_bodyend(g)
|
||
genarg *g;
|
||
{
|
||
sfsistat r;
|
||
sfsistat (*fi_body) __P((SMFICTX *, u_char *, size_t));
|
||
sfsistat (*fi_eom) __P((SMFICTX *));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
r = SMFIS_CONTINUE;
|
||
if (g->a_ctx->ctx_smfi != NULL)
|
||
{
|
||
if ((fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL &&
|
||
g->a_len > 0)
|
||
{
|
||
socket_t sd;
|
||
struct timeval timeout;
|
||
|
||
timeout.tv_sec = g->a_ctx->ctx_timeout;
|
||
timeout.tv_usec = 0;
|
||
sd = g->a_ctx->ctx_sd;
|
||
r = (*fi_body)(g->a_ctx, (u_char *)g->a_buf, g->a_len);
|
||
if (r != SMFIS_CONTINUE &&
|
||
sendreply(r, sd, &timeout, g->a_ctx) != MI_SUCCESS)
|
||
return _SMFIS_ABORT;
|
||
}
|
||
}
|
||
if (r == SMFIS_CONTINUE &&
|
||
(fi_eom = g->a_ctx->ctx_smfi->xxfi_eom) != NULL)
|
||
return (*fi_eom)(g->a_ctx);
|
||
return r;
|
||
}
|
||
/*
|
||
** ST_ABORTFCT -- deal with aborts
|
||
**
|
||
** Parameters:
|
||
** g -- generic argument structure
|
||
**
|
||
** Returns:
|
||
** abort or filter-specified value
|
||
*/
|
||
|
||
static int
|
||
st_abortfct(g)
|
||
genarg *g;
|
||
{
|
||
sfsistat (*fi_abort) __P((SMFICTX *));
|
||
|
||
if (g == NULL)
|
||
return _SMFIS_ABORT;
|
||
if (g != NULL && g->a_ctx->ctx_smfi != NULL &&
|
||
(fi_abort = g->a_ctx->ctx_smfi->xxfi_abort) != NULL)
|
||
(void) (*fi_abort)(g->a_ctx);
|
||
return _SMFIS_NOREPLY;
|
||
}
|
||
/*
|
||
** TRANS_OK -- is the state transition ok?
|
||
**
|
||
** Parameters:
|
||
** old -- old state
|
||
** new -- new state
|
||
**
|
||
** Returns:
|
||
** state transition ok
|
||
*/
|
||
|
||
static bool
|
||
trans_ok(old, new)
|
||
int old, new;
|
||
{
|
||
int s, n;
|
||
|
||
s = old;
|
||
do {
|
||
/* is this state transition allowed? */
|
||
if ((MASK(new) & next_states[s]) != 0)
|
||
return TRUE;
|
||
|
||
/*
|
||
** no: try next state;
|
||
** this works since the relevant states are ordered
|
||
** strict sequentially
|
||
*/
|
||
n = s + 1;
|
||
|
||
/*
|
||
** can we actually "skip" this state?
|
||
** see fix_stm() which sets this bit for those
|
||
** states which the filter program is not interested in
|
||
*/
|
||
if (bitset(NX_SKIP, next_states[n]))
|
||
s = n;
|
||
else
|
||
return FALSE;
|
||
} while (s <= ST_LAST);
|
||
return FALSE;
|
||
}
|
||
/*
|
||
** FIX_STM -- add "skip" bits to the state transition table
|
||
**
|
||
** Parameters:
|
||
** ctx -- context structure
|
||
**
|
||
** Returns:
|
||
** None.
|
||
**
|
||
** Side effects:
|
||
** may change state transition table.
|
||
*/
|
||
|
||
static void
|
||
fix_stm(ctx)
|
||
SMFICTX_PTR ctx;
|
||
{
|
||
u_long fl;
|
||
|
||
if (ctx == NULL || ctx->ctx_smfi == NULL)
|
||
return;
|
||
fl = ctx->ctx_pflags;
|
||
if (bitset(SMFIP_NOCONNECT, fl))
|
||
next_states[ST_CONN] |= NX_SKIP;
|
||
if (bitset(SMFIP_NOHELO, fl))
|
||
next_states[ST_HELO] |= NX_SKIP;
|
||
if (bitset(SMFIP_NOMAIL, fl))
|
||
next_states[ST_MAIL] |= NX_SKIP;
|
||
if (bitset(SMFIP_NORCPT, fl))
|
||
next_states[ST_RCPT] |= NX_SKIP;
|
||
if (bitset(SMFIP_NOHDRS, fl))
|
||
next_states[ST_HDRS] |= NX_SKIP;
|
||
if (bitset(SMFIP_NOEOH, fl))
|
||
next_states[ST_EOHS] |= NX_SKIP;
|
||
if (bitset(SMFIP_NOBODY, fl))
|
||
next_states[ST_BODY] |= NX_SKIP;
|
||
}
|
||
/*
|
||
** DEC_ARGV -- split a buffer into a list of strings, NULL terminated
|
||
**
|
||
** Parameters:
|
||
** buf -- buffer with several strings
|
||
** len -- length of buffer
|
||
**
|
||
** Returns:
|
||
** array of pointers to the individual strings
|
||
*/
|
||
|
||
static char **
|
||
dec_argv(buf, len)
|
||
char *buf;
|
||
size_t len;
|
||
{
|
||
char **s;
|
||
size_t i;
|
||
int elem, nelem;
|
||
|
||
nelem = 0;
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (buf[i] == '\0')
|
||
++nelem;
|
||
}
|
||
if (nelem == 0)
|
||
return NULL;
|
||
|
||
/* last entry is only for the name */
|
||
s = (char **)malloc((nelem + 1) * (sizeof *s));
|
||
if (s == NULL)
|
||
return NULL;
|
||
s[0] = buf;
|
||
for (i = 0, elem = 0; i < len && elem < nelem; i++)
|
||
{
|
||
if (buf[i] == '\0')
|
||
s[++elem] = &(buf[i + 1]);
|
||
}
|
||
|
||
/* overwrite last entry */
|
||
s[elem] = NULL;
|
||
return s;
|
||
}
|
||
/*
|
||
** DEC_ARG2 -- split a buffer into two strings
|
||
**
|
||
** Parameters:
|
||
** buf -- buffer with two strings
|
||
** len -- length of buffer
|
||
** s1,s2 -- pointer to result strings
|
||
**
|
||
** Returns:
|
||
** MI_FAILURE/MI_SUCCESS
|
||
*/
|
||
|
||
static int
|
||
dec_arg2(buf, len, s1, s2)
|
||
char *buf;
|
||
size_t len;
|
||
char **s1;
|
||
char **s2;
|
||
{
|
||
size_t i;
|
||
|
||
*s1 = buf;
|
||
for (i = 1; i < len && buf[i] != '\0'; i++)
|
||
continue;
|
||
if (i >= len - 1)
|
||
return MI_FAILURE;
|
||
*s2 = buf + i + 1;
|
||
return MI_SUCCESS;
|
||
}
|
||
/*
|
||
** SENDOK -- is it ok for the filter to send stuff to the MTA?
|
||
**
|
||
** Parameters:
|
||
** ctx -- context structure
|
||
** flag -- flag to check
|
||
**
|
||
** Returns:
|
||
** sending allowed (in current state)
|
||
*/
|
||
|
||
bool
|
||
mi_sendok(ctx, flag)
|
||
SMFICTX_PTR ctx;
|
||
int flag;
|
||
{
|
||
if (ctx == NULL || ctx->ctx_smfi == NULL)
|
||
return FALSE;
|
||
if (flag != 0 && !bitset(flag, ctx->ctx_smfi->xxfi_flags))
|
||
return FALSE;
|
||
return ctx->ctx_state == ST_ENDM;
|
||
}
|
||
#endif /* _FFR_MILTER */
|