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freebsd-dev/contrib/sendmail/libmilter/engine.c
Gregory Neil Shapiro 5b0945b570 Merge sendmail 8.16.1 to HEAD: See contrib/sendmail/RELEASE_NOTES for details 
Includes build infrastructure & config updates required for changes in 8.16.1

MFC after:	5 days
2020-07-15 18:28:54 +00:00

1924 lines
42 KiB
C
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/*
* Copyright (c) 1999-2004, 2006-2008 Proofpoint, 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.
*
*/
#include <sm/gen.h>
SM_RCSID("@(#)$Id: engine.c,v 8.168 2013-11-22 20:51:36 ca Exp $")
#include "libmilter.h"
#if NETINET || NETINET6
# include <arpa/inet.h>
#endif
/* generic argument for functions in the command table */
struct arg_struct
{
size_t a_len; /* length of buffer */
char *a_buf; /* argument string */
int a_idx; /* index for macro array */
SMFICTX_PTR a_ctx; /* context */
};
typedef struct arg_struct genarg;
/* structure for commands received from MTA */
struct cmdfct_t
{
char cm_cmd; /* command */
int cm_argt; /* type of arguments expected */
int cm_next; /* next state */
int cm_todo; /* what to do next */
int cm_macros; /* index for macros */
int (*cm_fct) __P((genarg *)); /* function to execute */
};
typedef struct cmdfct_t cmdfct;
/* possible values for cm_argt */
#define CM_BUF 0
#define CM_NULLOK 1
/* possible values for cm_todo */
#define CT_CONT 0x0000 /* continue reading commands */
#define CT_IGNO 0x0001 /* continue even when error */
/* not needed right now, done via return code instead */
#define CT_KEEP 0x0004 /* keep buffer (contains symbols) */
#define CT_END 0x0008 /* last command of session, stop replying */
/* index in macro array: macros only for these commands */
#define CI_NONE (-1)
#define CI_CONN 0
#define CI_HELO 1
#define CI_MAIL 2
#define CI_RCPT 3
#define CI_DATA 4
#define CI_EOM 5
#define CI_EOH 6
#define CI_LAST CI_EOH
#if CI_LAST < CI_DATA
ERROR: do not compile with CI_LAST < CI_DATA
#endif
#if CI_LAST < CI_EOM
ERROR: do not compile with CI_LAST < CI_EOM
#endif
#if CI_LAST < CI_EOH
ERROR: do not compile with CI_LAST < CI_EOH
#endif
#if CI_LAST < CI_RCPT
ERROR: do not compile with CI_LAST < CI_RCPT
#endif
#if CI_LAST < CI_MAIL
ERROR: do not compile with CI_LAST < CI_MAIL
#endif
#if CI_LAST < CI_HELO
ERROR: do not compile with CI_LAST < CI_HELO
#endif
#if CI_LAST < CI_CONN
ERROR: do not compile with CI_LAST < CI_CONN
#endif
#if CI_LAST >= MAX_MACROS_ENTRIES
ERROR: do not compile with CI_LAST >= MAX_MACROS_ENTRIES
#endif
/* function prototypes */
static int st_abortfct __P((genarg *));
static int st_macros __P((genarg *));
static int st_optionneg __P((genarg *));
static int st_bodychunk __P((genarg *));
static int st_connectinfo __P((genarg *));
static int st_bodyend __P((genarg *));
static int st_helo __P((genarg *));
static int st_header __P((genarg *));
static int st_sender __P((genarg *));
static int st_rcpt __P((genarg *));
static int st_unknown __P((genarg *));
static int st_data __P((genarg *));
static int st_eoh __P((genarg *));
static int st_quit __P((genarg *));
static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR));
static void fix_stm __P((SMFICTX_PTR));
static bool trans_ok __P((int, int));
static char **dec_argv __P((char *, size_t));
static int dec_arg2 __P((char *, size_t, char **, char **));
static void mi_clr_symlist __P((SMFICTX_PTR));
#if _FFR_WORKERS_POOL
static bool mi_rd_socket_ready __P((int));
#endif
/* states */
#define ST_NONE (-1)
#define ST_INIT 0 /* initial state */
#define ST_OPTS 1 /* option negotiation */
#define ST_CONN 2 /* connection info */
#define ST_HELO 3 /* helo */
#define ST_MAIL 4 /* mail from */
#define ST_RCPT 5 /* rcpt to */
#define ST_DATA 6 /* data */
#define ST_HDRS 7 /* headers */
#define ST_EOHS 8 /* end of headers */
#define ST_BODY 9 /* body */
#define ST_ENDM 10 /* end of message */
#define ST_QUIT 11 /* quit */
#define ST_ABRT 12 /* abort */
#define ST_UNKN 13 /* unknown SMTP command */
#define ST_Q_NC 14 /* quit, new connection follows */
#define ST_LAST ST_Q_NC /* last valid state */
#define ST_SKIP 16 /* not a state but required for the state table */
/* in a mail transaction? must be before eom according to spec. */
#define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM)
/*
** set of next states
** each state (ST_*) corresponds to bit in an int value (1 << state)
** each state has a set of allowed transitions ('or' of bits of states)
** so a state transition is valid if the mask of the next state
** is set in the NX_* value
** this function is coded in trans_ok(), see below.
*/
#define MI_MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */
#define NX_INIT (MI_MASK(ST_OPTS))
#define NX_OPTS (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN))
#define NX_CONN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN))
#define NX_HELO (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN))
#define NX_MAIL (MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN))
#define NX_RCPT (MI_MASK(ST_HDRS) | MI_MASK(ST_EOHS) | MI_MASK(ST_DATA) | \
MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | \
MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN))
#define NX_DATA (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT))
#define NX_HDRS (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT))
#define NX_EOHS (MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | MI_MASK(ST_ABRT))
#define NX_BODY (MI_MASK(ST_ENDM) | MI_MASK(ST_BODY) | MI_MASK(ST_ABRT))
#define NX_ENDM (MI_MASK(ST_QUIT) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN) | \
MI_MASK(ST_Q_NC))
#define NX_QUIT 0
#define NX_ABRT 0
#define NX_UNKN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | \
MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | \
MI_MASK(ST_DATA) | \
MI_MASK(ST_BODY) | MI_MASK(ST_UNKN) | \
MI_MASK(ST_ABRT) | MI_MASK(ST_QUIT) | MI_MASK(ST_Q_NC))
#define NX_Q_NC (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN))
#define NX_SKIP MI_MASK(ST_SKIP)
static int next_states[] =
{
NX_INIT
, NX_OPTS
, NX_CONN
, NX_HELO
, NX_MAIL
, NX_RCPT
, NX_DATA
, NX_HDRS
, NX_EOHS
, NX_BODY
, NX_ENDM
, NX_QUIT
, NX_ABRT
, NX_UNKN
, NX_Q_NC
};
#define SIZE_NEXT_STATES (sizeof(next_states) / sizeof(next_states[0]))
/* commands received by milter */
static cmdfct cmds[] =
{
{SMFIC_ABORT, CM_NULLOK, ST_ABRT, CT_CONT, CI_NONE, st_abortfct}
, {SMFIC_MACRO, CM_BUF, ST_NONE, CT_KEEP, CI_NONE, st_macros }
, {SMFIC_BODY, CM_BUF, ST_BODY, CT_CONT, CI_NONE, st_bodychunk}
, {SMFIC_CONNECT, CM_BUF, ST_CONN, CT_CONT, CI_CONN, st_connectinfo}
, {SMFIC_BODYEOB, CM_NULLOK, ST_ENDM, CT_CONT, CI_EOM, st_bodyend }
, {SMFIC_HELO, CM_BUF, ST_HELO, CT_CONT, CI_HELO, st_helo }
, {SMFIC_HEADER, CM_BUF, ST_HDRS, CT_CONT, CI_NONE, st_header }
, {SMFIC_MAIL, CM_BUF, ST_MAIL, CT_CONT, CI_MAIL, st_sender }
, {SMFIC_OPTNEG, CM_BUF, ST_OPTS, CT_CONT, CI_NONE, st_optionneg}
, {SMFIC_EOH, CM_NULLOK, ST_EOHS, CT_CONT, CI_EOH, st_eoh }
, {SMFIC_QUIT, CM_NULLOK, ST_QUIT, CT_END, CI_NONE, st_quit }
, {SMFIC_DATA, CM_NULLOK, ST_DATA, CT_CONT, CI_DATA, st_data }
, {SMFIC_RCPT, CM_BUF, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt }
, {SMFIC_UNKNOWN, CM_BUF, ST_UNKN, CT_IGNO, CI_NONE, st_unknown }
, {SMFIC_QUIT_NC, CM_NULLOK, ST_Q_NC, CT_CONT, CI_NONE, st_quit }
};
/*
** Additional (internal) reply codes;
** must be coordinated wit libmilter/mfapi.h
*/
#define _SMFIS_KEEP 20
#define _SMFIS_ABORT 21
#define _SMFIS_OPTIONS 22
#define _SMFIS_NOREPLY SMFIS_NOREPLY
#define _SMFIS_FAIL (-1)
#define _SMFIS_NONE (-2)
/*
** MI_ENGINE -- receive commands and process them
**
** Parameters:
** ctx -- context structure
**
** Returns:
** MI_FAILURE/MI_SUCCESS
*/
int
mi_engine(ctx)
SMFICTX_PTR ctx;
{
size_t len;
int i;
socket_t sd;
int ret = MI_SUCCESS;
int ncmds = sizeof(cmds) / sizeof(cmdfct);
int curstate = ST_INIT;
int newstate;
bool call_abort;
sfsistat r;
char cmd;
char *buf = NULL;
genarg arg;
struct timeval timeout;
int (*f) __P((genarg *));
sfsistat (*fi_abort) __P((SMFICTX *));
sfsistat (*fi_close) __P((SMFICTX *));
arg.a_ctx = ctx;
sd = ctx->ctx_sd;
fi_abort = ctx->ctx_smfi->xxfi_abort;
#if _FFR_WORKERS_POOL
curstate = ctx->ctx_state;
if (curstate == ST_INIT)
{
mi_clr_macros(ctx, 0);
fix_stm(ctx);
}
#else /* _FFR_WORKERS_POOL */
mi_clr_macros(ctx, 0);
fix_stm(ctx);
#endif /* _FFR_WORKERS_POOL */
r = _SMFIS_NONE;
do
{
/* call abort only if in a mail transaction */
call_abort = ST_IN_MAIL(curstate);
timeout.tv_sec = ctx->ctx_timeout;
timeout.tv_usec = 0;
if (mi_stop() == MILTER_ABRT)
{
if (ctx->ctx_dbg > 3)
sm_dprintf("[%lu] milter_abort\n",
(long) ctx->ctx_id);
ret = MI_FAILURE;
break;
}
/*
** Notice: buf is allocated by mi_rd_cmd() and it will
** usually be free()d after it has been used in f().
** However, if the function returns _SMFIS_KEEP then buf
** contains macros and will not be free()d.
** Hence r must be set to _SMFIS_NONE if a new buf is
** allocated to avoid problem with housekeeping, esp.
** if the code "break"s out of the loop.
*/
#if _FFR_WORKERS_POOL
/* Is the socket ready to be read ??? */
if (!mi_rd_socket_ready(sd))
{
ret = MI_CONTINUE;
break;
}
#endif /* _FFR_WORKERS_POOL */
r = _SMFIS_NONE;
if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len,
ctx->ctx_smfi->xxfi_name)) == NULL &&
cmd < SMFIC_VALIDCMD)
{
if (ctx->ctx_dbg > 5)
sm_dprintf("[%lu] mi_engine: mi_rd_cmd error (%x)\n",
(long) ctx->ctx_id, (int) cmd);
/*
** eof is currently treated as failure ->
** abort() instead of close(), otherwise use:
** if (cmd != SMFIC_EOF)
*/
ret = MI_FAILURE;
break;
}
if (ctx->ctx_dbg > 4)
sm_dprintf("[%lu] got cmd '%c' len %d\n",
(long) ctx->ctx_id, cmd, (int) len);
for (i = 0; i < ncmds; i++)
{
if (cmd == cmds[i].cm_cmd)
break;
}
if (i >= ncmds)
{
/* unknown command */
if (ctx->ctx_dbg > 1)
sm_dprintf("[%lu] cmd '%c' unknown\n",
(long) ctx->ctx_id, cmd);
ret = MI_FAILURE;
break;
}
if ((f = cmds[i].cm_fct) == NULL)
{
/* stop for now */
if (ctx->ctx_dbg > 1)
sm_dprintf("[%lu] cmd '%c' not impl\n",
(long) ctx->ctx_id, cmd);
ret = MI_FAILURE;
break;
}
/* is new state ok? */
newstate = cmds[i].cm_next;
if (ctx->ctx_dbg > 5)
sm_dprintf("[%lu] cur %x new %x nextmask %x\n",
(long) ctx->ctx_id,
curstate, newstate, next_states[curstate]);
if (newstate != ST_NONE && !trans_ok(curstate, newstate))
{
if (ctx->ctx_dbg > 1)
sm_dprintf("[%lu] abort: cur %d (%x) new %d (%x) next %x\n",
(long) ctx->ctx_id,
curstate, MI_MASK(curstate),
newstate, MI_MASK(newstate),
next_states[curstate]);
/* call abort only if in a mail transaction */
if (fi_abort != NULL && call_abort)
(void) (*fi_abort)(ctx);
/*
** try to reach the new state from HELO
** if it can't be reached, ignore the command.
*/
curstate = ST_HELO;
if (!trans_ok(curstate, newstate))
{
if (buf != NULL)
{
free(buf);
buf = NULL;
}
continue;
}
}
if (cmds[i].cm_argt != CM_NULLOK && buf == NULL)
{
/* stop for now */
if (ctx->ctx_dbg > 1)
sm_dprintf("[%lu] cmd='%c', buf=NULL\n",
(long) ctx->ctx_id, cmd);
ret = MI_FAILURE;
break;
}
arg.a_len = len;
arg.a_buf = buf;
if (newstate != ST_NONE)
{
curstate = newstate;
ctx->ctx_state = curstate;
}
arg.a_idx = cmds[i].cm_macros;
call_abort = ST_IN_MAIL(curstate);
/* call function to deal with command */
MI_MONITOR_BEGIN(ctx, cmd);
r = (*f)(&arg);
MI_MONITOR_END(ctx, cmd);
if (r != _SMFIS_KEEP && buf != NULL)
{
free(buf);
buf = NULL;
}
if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS)
{
ret = MI_FAILURE;
break;
}
if (r == SMFIS_ACCEPT)
{
/* accept mail, no further actions taken */
curstate = ST_HELO;
}
else if (r == SMFIS_REJECT || r == SMFIS_DISCARD ||
r == SMFIS_TEMPFAIL)
{
/*
** further actions depend on current state
** if the IGNO bit is set: "ignore" the error,
** i.e., stay in the current state
*/
if (!bitset(CT_IGNO, cmds[i].cm_todo))
curstate = ST_HELO;
}
else if (r == _SMFIS_ABORT)
{
if (ctx->ctx_dbg > 5)
sm_dprintf("[%lu] function returned abort\n",
(long) ctx->ctx_id);
ret = MI_FAILURE;
break;
}
} while (!bitset(CT_END, cmds[i].cm_todo));
ctx->ctx_state = curstate;
if (ret == MI_FAILURE)
{
/* call abort only if in a mail transaction */
if (fi_abort != NULL && call_abort)
(void) (*fi_abort)(ctx);
}
/* has close been called? */
if (ctx->ctx_state != ST_QUIT
#if _FFR_WORKERS_POOL
&& ret != MI_CONTINUE
#endif
)
{
if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL)
(void) (*fi_close)(ctx);
}
if (r != _SMFIS_KEEP && buf != NULL)
free(buf);
#if !_FFR_WORKERS_POOL
mi_clr_macros(ctx, 0);
#endif
return ret;
}
static size_t milter_addsymlist __P((SMFICTX_PTR, char *, char **));
static size_t
milter_addsymlist(ctx, buf, newbuf)
SMFICTX_PTR ctx;
char *buf;
char **newbuf;
{
size_t len;
int i;
mi_int32 v;
char *buffer;
SM_ASSERT(ctx != NULL);
SM_ASSERT(buf != NULL);
SM_ASSERT(newbuf != NULL);
len = 0;
for (i = 0; i < MAX_MACROS_ENTRIES; i++)
{
if (ctx->ctx_mac_list[i] != NULL)
{
len += strlen(ctx->ctx_mac_list[i]) + 1 +
MILTER_LEN_BYTES;
}
}
if (len > 0)
{
size_t offset;
SM_ASSERT(len + MILTER_OPTLEN > len);
len += MILTER_OPTLEN;
buffer = malloc(len);
if (buffer != NULL)
{
(void) memcpy(buffer, buf, MILTER_OPTLEN);
offset = MILTER_OPTLEN;
for (i = 0; i < MAX_MACROS_ENTRIES; i++)
{
size_t l;
if (ctx->ctx_mac_list[i] == NULL)
continue;
SM_ASSERT(offset + MILTER_LEN_BYTES < len);
v = htonl(i);
(void) memcpy(buffer + offset, (void *) &v,
MILTER_LEN_BYTES);
offset += MILTER_LEN_BYTES;
l = strlen(ctx->ctx_mac_list[i]) + 1;
SM_ASSERT(offset + l <= len);
(void) memcpy(buffer + offset,
ctx->ctx_mac_list[i], l);
offset += l;
}
}
else
{
/* oops ... */
}
}
else
{
len = MILTER_OPTLEN;
buffer = buf;
}
*newbuf = buffer;
return len;
}
/*
** GET_NR_BIT -- get "no reply" bit matching state
**
** Parameters:
** state -- current protocol stage
**
** Returns:
** 0: no matching bit
** >0: the matching "no reply" bit
*/
static unsigned long get_nr_bit __P((int));
static unsigned long
get_nr_bit(state)
int state;
{
unsigned long bit;
switch (state)
{
case ST_CONN:
bit = SMFIP_NR_CONN;
break;
case ST_HELO:
bit = SMFIP_NR_HELO;
break;
case ST_MAIL:
bit = SMFIP_NR_MAIL;
break;
case ST_RCPT:
bit = SMFIP_NR_RCPT;
break;
case ST_DATA:
bit = SMFIP_NR_DATA;
break;
case ST_UNKN:
bit = SMFIP_NR_UNKN;
break;
case ST_HDRS:
bit = SMFIP_NR_HDR;
break;
case ST_EOHS:
bit = SMFIP_NR_EOH;
break;
case ST_BODY:
bit = SMFIP_NR_BODY;
break;
default:
bit = 0;
break;
}
return bit;
}
/*
** SENDREPLY -- send a reply to the MTA
**
** Parameters:
** r -- reply code
** sd -- socket descriptor
** timeout_ptr -- (ptr to) timeout to use for sending
** ctx -- context structure
**
** Returns:
** MI_SUCCESS/MI_FAILURE
*/
static int
sendreply(r, sd, timeout_ptr, ctx)
sfsistat r;
socket_t sd;
struct timeval *timeout_ptr;
SMFICTX_PTR ctx;
{
int ret;
unsigned long bit;
ret = MI_SUCCESS;
bit = get_nr_bit(ctx->ctx_state);
if (bit != 0 && (ctx->ctx_pflags & bit) != 0 && r != SMFIS_NOREPLY)
{
if (r >= SMFIS_CONTINUE && r < _SMFIS_KEEP)
{
/* milter said it wouldn't reply, but it lied... */
smi_log(SMI_LOG_ERR,
"%s: milter claimed not to reply in state %d but did anyway %d",
ctx->ctx_smfi->xxfi_name,
ctx->ctx_state, r);
}
/*
** Force specified behavior, otherwise libmilter
** and MTA will fail to communicate properly.
*/
switch (r)
{
case SMFIS_CONTINUE:
case SMFIS_TEMPFAIL:
case SMFIS_REJECT:
case SMFIS_DISCARD:
case SMFIS_ACCEPT:
case SMFIS_SKIP:
case _SMFIS_OPTIONS:
r = SMFIS_NOREPLY;
break;
}
}
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 &&
((r == SMFIS_TEMPFAIL && *ctx->ctx_reply == '4') ||
(r == SMFIS_REJECT && *ctx->ctx_reply == '5')))
{
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_SKIP:
ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_SKIP, NULL, 0);
break;
case _SMFIS_OPTIONS:
{
mi_int32 v;
size_t len;
char *buffer;
char buf[MILTER_OPTLEN];
v = htonl(ctx->ctx_prot_vers2mta);
(void) memcpy(&(buf[0]), (void *) &v,
MILTER_LEN_BYTES);
v = htonl(ctx->ctx_aflags);
(void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v,
MILTER_LEN_BYTES);
v = htonl(ctx->ctx_pflags2mta);
(void) memcpy(&(buf[MILTER_LEN_BYTES * 2]),
(void *) &v, MILTER_LEN_BYTES);
len = milter_addsymlist(ctx, buf, &buffer);
if (buffer != NULL)
{
ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG,
buffer, len);
if (buffer != buf)
free(buffer);
}
else
ret = MI_FAILURE;
}
break;
case SMFIS_NOREPLY:
if (bit != 0 &&
(ctx->ctx_pflags & bit) != 0 &&
(ctx->ctx_mta_pflags & bit) == 0)
{
/*
** milter doesn't want to send a reply,
** but the MTA doesn't have that feature: fake it.
*/
ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL,
0);
}
break;
default: /* don't send a reply */
break;
}
return ret;
}
/*
** MI_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;
}
}
}
/*
** MI_CLR_SYMLIST -- clear list of macros
**
** Parameters:
** ctx -- context structure
**
** Returns:
** None.
*/
static void
mi_clr_symlist(ctx)
SMFICTX *ctx;
{
int i;
SM_ASSERT(ctx != NULL);
for (i = SMFIM_FIRST; i <= SMFIM_LAST; i++)
{
if (ctx->ctx_mac_list[i] != NULL)
{
free(ctx->ctx_mac_list[i]);
ctx->ctx_mac_list[i] = NULL;
}
}
}
/*
** MI_CLR_CTX -- clear context
**
** Parameters:
** ctx -- context structure
**
** Returns:
** None.
*/
void
mi_clr_ctx(ctx)
SMFICTX *ctx;
{
SM_ASSERT(ctx != NULL);
if (ValidSocket(ctx->ctx_sd))
{
(void) closesocket(ctx->ctx_sd);
ctx->ctx_sd = INVALID_SOCKET;
}
if (ctx->ctx_reply != NULL)
{
free(ctx->ctx_reply);
ctx->ctx_reply = NULL;
}
if (ctx->ctx_privdata != NULL)
{
smi_log(SMI_LOG_WARN,
"%s: private data not NULL",
ctx->ctx_smfi->xxfi_name);
}
mi_clr_macros(ctx, 0);
mi_clr_symlist(ctx);
free(ctx);
}
/*
** 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, fake_pflags, internal_pflags;
SMFICTX_PTR ctx;
#if _FFR_MILTER_CHECK
bool testmode = false;
#endif
int (*fi_negotiate) __P((SMFICTX *,
unsigned long, unsigned long,
unsigned long, unsigned long,
unsigned long *, unsigned long *,
unsigned long *, unsigned long *));
if (g == NULL || g->a_ctx->ctx_smfi == NULL)
return SMFIS_CONTINUE;
ctx = g->a_ctx;
mi_clr_macros(ctx, g->a_idx + 1);
ctx->ctx_prot_vers = SMFI_PROT_VERSION;
/* check for minimum length */
if (g->a_len < MILTER_OPTLEN)
{
smi_log(SMI_LOG_ERR,
"%s: st_optionneg[%ld]: len too short %d < %d",
ctx->ctx_smfi->xxfi_name,
(long) ctx->ctx_id, (int) g->a_len,
MILTER_OPTLEN);
return _SMFIS_ABORT;
}
/* protocol version */
(void) memcpy((void *) &i, (void *) &(g->a_buf[0]), MILTER_LEN_BYTES);
v = ntohl(i);
#define SMFI_PROT_VERSION_MIN 2
/* check for minimum version */
if (v < SMFI_PROT_VERSION_MIN)
{
smi_log(SMI_LOG_ERR,
"%s: st_optionneg[%ld]: protocol version too old %d < %d",
ctx->ctx_smfi->xxfi_name,
(long) ctx->ctx_id, v, SMFI_PROT_VERSION_MIN);
return _SMFIS_ABORT;
}
ctx->ctx_mta_prot_vers = v;
if (ctx->ctx_prot_vers < ctx->ctx_mta_prot_vers)
ctx->ctx_prot_vers2mta = ctx->ctx_prot_vers;
else
ctx->ctx_prot_vers2mta = ctx->ctx_mta_prot_vers;
(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;
ctx->ctx_mta_aflags = v; /* MTA action flags */
internal_pflags = 0;
(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;
#if _FFR_MDS_NEGOTIATE
else if (ctx->ctx_smfi->xxfi_version >= SMFI_VERSION_MDS)
{
/*
** Allow changing the size only if milter is compiled
** against a version that supports this.
** If a milter is dynamically linked against a newer
** libmilter version, we don't want to "surprise"
** it with a larger buffer as it may rely on it
** even though it is not documented as a limit.
*/
if (bitset(SMFIP_MDS_1M, v))
{
internal_pflags |= SMFIP_MDS_1M;
(void) smfi_setmaxdatasize(MILTER_MDS_1M);
}
else if (bitset(SMFIP_MDS_256K, v))
{
internal_pflags |= SMFIP_MDS_256K;
(void) smfi_setmaxdatasize(MILTER_MDS_256K);
}
}
# if 0
/* don't log this for now... */
else if (ctx->ctx_smfi->xxfi_version < SMFI_VERSION_MDS &&
bitset(SMFIP_MDS_1M|SMFIP_MDS_256K, v))
{
smi_log(SMI_LOG_WARN,
"%s: st_optionneg[%ld]: milter version=%X, trying flags=%X",
ctx->ctx_smfi->xxfi_name,
(long) ctx->ctx_id, ctx->ctx_smfi->xxfi_version, v);
}
# endif /* 0 */
#endif /* _FFR_MDS_NEGOTIATE */
/*
** MTA protocol flags.
** We pass the internal flags to the milter as "read only",
** i.e., a milter can read them so it knows which size
** will be used, but any changes by a milter will be ignored
** (see below, search for SMFI_INTERNAL).
*/
ctx->ctx_mta_pflags = (v & ~SMFI_INTERNAL) | internal_pflags;
/*
** Copy flags from milter struct into libmilter context;
** this variable will be used later on to check whether
** the MTA "actions" can fulfill the milter requirements,
** but it may be overwritten by the negotiate callback.
*/
ctx->ctx_aflags = ctx->ctx_smfi->xxfi_flags;
fake_pflags = SMFIP_NR_CONN
|SMFIP_NR_HELO
|SMFIP_NR_MAIL
|SMFIP_NR_RCPT
|SMFIP_NR_DATA
|SMFIP_NR_UNKN
|SMFIP_NR_HDR
|SMFIP_NR_EOH
|SMFIP_NR_BODY
;
if (g->a_ctx->ctx_smfi != NULL &&
g->a_ctx->ctx_smfi->xxfi_version > 4 &&
(fi_negotiate = g->a_ctx->ctx_smfi->xxfi_negotiate) != NULL)
{
int r;
unsigned long m_aflags, m_pflags, m_f2, m_f3;
/*
** let milter decide whether the features offered by the
** MTA are "good enough".
** Notes:
** - libmilter can "fake" some features (e.g., SMFIP_NR_HDR)
** - m_f2, m_f3 are for future extensions
*/
m_f2 = m_f3 = 0;
m_aflags = ctx->ctx_mta_aflags;
m_pflags = ctx->ctx_pflags;
if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0)
m_pflags |= SMFIP_SKIP;
r = fi_negotiate(g->a_ctx,
ctx->ctx_mta_aflags,
ctx->ctx_mta_pflags|fake_pflags,
0, 0,
&m_aflags, &m_pflags, &m_f2, &m_f3);
#if _FFR_MILTER_CHECK
testmode = bitset(SMFIP_TEST, m_pflags);
if (testmode)
m_pflags &= ~SMFIP_TEST;
#endif
/*
** Types of protocol flags (pflags):
** 1. do NOT send protocol step X
** 2. MTA can do/understand something extra (SKIP,
** send unknown RCPTs)
** 3. MTA can deal with "no reply" for various protocol steps
** Note: this mean that it isn't possible to simply set all
** flags to get "everything":
** setting a flag of type 1 turns off a step
** (it should be the other way around:
** a flag means a protocol step can be sent)
** setting a flag of type 3 requires that milter
** never sends a reply for the corresponding step.
** Summary: the "negation" of protocol flags is causing
** problems, but at least for type 3 there is no simple
** solution.
**
** What should "all options" mean?
** send all protocol steps _except_ those for which there is
** no callback (currently registered in ctx_pflags)
** expect SKIP as return code? Yes
** send unknown RCPTs? No,
** must be explicitly requested?
** "no reply" for some protocol steps? No,
** must be explicitly requested.
*/
if (SMFIS_ALL_OPTS == r)
{
ctx->ctx_aflags = ctx->ctx_mta_aflags;
ctx->ctx_pflags2mta = ctx->ctx_pflags;
if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0)
ctx->ctx_pflags2mta |= SMFIP_SKIP;
}
else if (r != SMFIS_CONTINUE)
{
smi_log(SMI_LOG_ERR,
"%s: st_optionneg[%ld]: xxfi_negotiate returned %d (protocol options=0x%lx, actions=0x%lx)",
ctx->ctx_smfi->xxfi_name,
(long) ctx->ctx_id, r, ctx->ctx_mta_pflags,
ctx->ctx_mta_aflags);
return _SMFIS_ABORT;
}
else
{
ctx->ctx_aflags = m_aflags;
ctx->ctx_pflags = m_pflags;
ctx->ctx_pflags2mta = m_pflags;
}
/* check whether some flags need to be "faked" */
i = ctx->ctx_pflags2mta;
if ((ctx->ctx_mta_pflags & i) != i)
{
unsigned int idx;
unsigned long b;
/*
** If some behavior can be faked (set in fake_pflags),
** but the MTA doesn't support it, then unset
** that flag in the value that is sent to the MTA.
*/
for (idx = 0; idx < 32; idx++)
{
b = 1 << idx;
if ((ctx->ctx_mta_pflags & b) != b &&
(fake_pflags & b) == b)
ctx->ctx_pflags2mta &= ~b;
}
}
}
else
{
/*
** Set the protocol flags based on the values determined
** in mi_listener() which checked the defined callbacks.
*/
ctx->ctx_pflags2mta = ctx->ctx_pflags;
}
/* check whether actions and protocol requirements can be satisfied */
i = ctx->ctx_aflags;
if ((i & ctx->ctx_mta_aflags) != i)
{
smi_log(SMI_LOG_ERR,
"%s: st_optionneg[%ld]: 0x%lx does not fulfill action requirements 0x%x",
ctx->ctx_smfi->xxfi_name,
(long) ctx->ctx_id, ctx->ctx_mta_aflags, i);
return _SMFIS_ABORT;
}
i = ctx->ctx_pflags2mta;
if ((ctx->ctx_mta_pflags & i) != i)
{
/*
** Older MTAs do not support some protocol steps.
** As this protocol is a bit "weird" (it asks for steps
** NOT to be taken/sent) we have to check whether we
** should turn off those "negative" requests.
** Currently these are only SMFIP_NODATA and SMFIP_NOUNKNOWN.
*/
if (bitset(SMFIP_NODATA, ctx->ctx_pflags2mta) &&
!bitset(SMFIP_NODATA, ctx->ctx_mta_pflags))
ctx->ctx_pflags2mta &= ~SMFIP_NODATA;
if (bitset(SMFIP_NOUNKNOWN, ctx->ctx_pflags2mta) &&
!bitset(SMFIP_NOUNKNOWN, ctx->ctx_mta_pflags))
ctx->ctx_pflags2mta &= ~SMFIP_NOUNKNOWN;
i = ctx->ctx_pflags2mta;
}
if ((ctx->ctx_mta_pflags & i) != i)
{
smi_log(SMI_LOG_ERR,
"%s: st_optionneg[%ld]: 0x%lx does not fulfill protocol requirements 0x%x",
ctx->ctx_smfi->xxfi_name,
(long) ctx->ctx_id, ctx->ctx_mta_pflags, i);
return _SMFIS_ABORT;
}
fix_stm(ctx);
if (ctx->ctx_dbg > 3)
sm_dprintf("[%lu] milter_negotiate:"
" mta_actions=0x%lx, mta_flags=0x%lx"
" actions=0x%lx, flags=0x%lx\n"
, (long) ctx->ctx_id
, ctx->ctx_mta_aflags, ctx->ctx_mta_pflags
, ctx->ctx_aflags, ctx->ctx_pflags);
#if _FFR_MILTER_CHECK
if (ctx->ctx_dbg > 3)
sm_dprintf("[%lu] milter_negotiate:"
" testmode=%d, pflags2mta=%X, internal_pflags=%X\n"
, (long) ctx->ctx_id, testmode
, ctx->ctx_pflags2mta, internal_pflags);
/* in test mode: take flags without further modifications */
if (!testmode)
/* Warning: check statement below! */
#endif /* _FFR_MILTER_CHECK */
/*
** Remove the internal flags that might have been set by a milter
** and set only those determined above.
*/
ctx->ctx_pflags2mta = (ctx->ctx_pflags2mta & ~SMFI_INTERNAL)
| internal_pflags;
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;
unsigned 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 (i <= l && s[i] != '\0')
++i;
if (i + 1 >= l)
return _SMFIS_ABORT;
/* Move past trailing \0 in host string */
i++;
family = s[i++];
(void) memset(&sockaddr, '\0', sizeof sockaddr);
if (family != SMFIA_UNKNOWN)
{
if (i + sizeof port >= l)
{
smi_log(SMI_LOG_ERR,
"%s: connect[%ld]: wrong len %d >= %d",
g->a_ctx->ctx_smfi->xxfi_name,
(long) g->a_ctx->ctx_id, (int) i, (int) l);
return _SMFIS_ABORT;
}
(void) memcpy((void *) &port, (void *) (s + i),
sizeof port);
i += sizeof port;
/* make sure string is terminated */
if (s[l - 1] != '\0')
return _SMFIS_ABORT;
# if NETINET
if (family == SMFIA_INET)
{
if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr)
!= 1)
{
smi_log(SMI_LOG_ERR,
"%s: connect[%ld]: inet_aton failed",
g->a_ctx->ctx_smfi->xxfi_name,
(long) 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 (mi_inet_pton(AF_INET6, s + i,
&sockaddr.sin6.sin6_addr) != 1)
{
smi_log(SMI_LOG_ERR,
"%s: connect[%ld]: mi_inet_pton failed",
g->a_ctx->ctx_smfi->xxfi_name,
(long) 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 (sm_strlcpy(sockaddr.sunix.sun_path, s + i,
sizeof sockaddr.sunix.sun_path) >=
sizeof sockaddr.sunix.sun_path)
{
smi_log(SMI_LOG_ERR,
"%s: connect[%ld]: path too long",
g->a_ctx->ctx_smfi->xxfi_name,
(long) g->a_ctx->ctx_id);
return _SMFIS_ABORT;
}
sockaddr.sunix.sun_family = AF_UNIX;
}
else
# endif /* NETUNIX */
{
smi_log(SMI_LOG_ERR,
"%s: connect[%ld]: unknown family %d",
g->a_ctx->ctx_smfi->xxfi_name,
(long) 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_DATA -- DATA command
**
** Parameters:
** g -- generic argument structure
**
** Returns:
** continue or filter-specified value
*/
static int
st_data(g)
genarg *g;
{
sfsistat (*fi_data) __P((SMFICTX *));
if (g == NULL)
return _SMFIS_ABORT;
if (g->a_ctx->ctx_smfi != NULL &&
g->a_ctx->ctx_smfi->xxfi_version > 3 &&
(fi_data = g->a_ctx->ctx_smfi->xxfi_data) != NULL)
return (*fi_data)(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)
{
/* paranoia: check for terminating '\0' */
if (g->a_len == 0 || g->a_buf[g->a_len - 1] != '\0')
return MI_FAILURE;
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_UNKNOWN -- unrecognized or unimplemented command
**
** Parameters:
** g -- generic argument structure
**
** Returns:
** continue or filter-specified value
*/
static int
st_unknown(g)
genarg *g;
{
sfsistat (*fi_unknown) __P((SMFICTX *, const char *));
if (g == NULL)
return _SMFIS_ABORT;
if (g->a_ctx->ctx_smfi != NULL &&
g->a_ctx->ctx_smfi->xxfi_version > 2 &&
(fi_unknown = g->a_ctx->ctx_smfi->xxfi_unknown) != NULL)
return (*fi_unknown)(g->a_ctx, (const char *) g->a_buf);
return SMFIS_CONTINUE;
}
/*
** 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;
case SMFIC_DATA:
i = CI_DATA;
break;
case SMFIC_BODYEOB:
i = CI_EOM;
break;
case SMFIC_EOH:
i = CI_EOH;
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
*/
/* ARGSUSED */
static int
st_quit(g)
genarg *g;
{
sfsistat (*fi_close) __P((SMFICTX *));
if (g == NULL)
return _SMFIS_ABORT;
if (g->a_ctx->ctx_smfi != NULL &&
(fi_close = g->a_ctx->ctx_smfi->xxfi_close) != NULL)
(void) (*fi_close)(g->a_ctx);
mi_clr_macros(g->a_ctx, 0);
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 *, unsigned 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, (unsigned 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 *, unsigned 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, (unsigned 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;
if (s >= SIZE_NEXT_STATES)
return false;
do
{
/* is this state transition allowed? */
if ((MI_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;
if (n >= SIZE_NEXT_STATES)
return false;
/*
** 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 < SIZE_NEXT_STATES);
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;
{
unsigned 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;
if (bitset(SMFIP_NODATA, fl))
next_states[ST_DATA] |= NX_SKIP;
if (bitset(SMFIP_NOUNKNOWN, fl))
next_states[ST_UNKN] |= 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')
{
++elem;
if (i + 1 >= len)
s[elem] = NULL;
else
s[elem] = &(buf[i + 1]);
}
}
/* overwrite last entry (already done above, just paranoia) */
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;
/* paranoia: check for terminating '\0' */
if (len == 0 || buf[len - 1] != '\0')
return MI_FAILURE;
*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;
}
/*
** MI_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;
/* did the milter request this operation? */
if (flag != 0 && !bitset(flag, ctx->ctx_aflags))
return false;
/* are we in the correct state? It must be "End of Message". */
return ctx->ctx_state == ST_ENDM;
}
#if _FFR_WORKERS_POOL
/*
** MI_RD_SOCKET_READY - checks if the socket is ready for read(2)
**
** Parameters:
** sd -- socket_t
**
** Returns:
** true iff socket is ready for read(2)
*/
#define MI_RD_CMD_TO 1
#define MI_RD_MAX_ERR 16
static bool
mi_rd_socket_ready (sd)
socket_t sd;
{
int n;
int nerr = 0;
#if SM_CONF_POLL
struct pollfd pfd;
#else
fd_set rd_set, exc_set;
#endif
do
{
#if SM_CONF_POLL
pfd.fd = sd;
pfd.events = POLLIN;
pfd.revents = 0;
n = poll(&pfd, 1, MI_RD_CMD_TO);
#else /* SM_CONF_POLL */
struct timeval timeout;
FD_ZERO(&rd_set);
FD_ZERO(&exc_set);
FD_SET(sd, &rd_set);
FD_SET(sd, &exc_set);
timeout.tv_sec = MI_RD_CMD_TO / 1000;
timeout.tv_usec = 0;
n = select(sd + 1, &rd_set, NULL, &exc_set, &timeout);
#endif /* SM_CONF_POLL */
if (n < 0)
{
if (errno == EINTR)
{
nerr++;
continue;
}
return true;
}
if (n == 0)
return false;
break;
} while (nerr < MI_RD_MAX_ERR);
if (nerr >= MI_RD_MAX_ERR)
return false;
#if SM_CONF_POLL
return (pfd.revents != 0);
#else
return FD_ISSET(sd, &rd_set) || FD_ISSET(sd, &exc_set);
#endif
}
#endif /* _FFR_WORKERS_POOL */
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