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engine.c
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engine.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 /* NETINET || NETINET6 */
/* 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_ARG0 0 /* no args */
#define CM_ARG1 1 /* one arg (string) */
#define CM_ARG2 2 /* two args (strings) */
#define CM_ARGA 4 /* one string and _SOCK_ADDR */
#define CM_ARGO 5 /* two integers */
#define CM_ARGV 8 /* \0 separated list of args, NULL-terminated */
#define CM_ARGN 9 /* \0 separated list of args (strings) */
/* 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_ENVRCPT
ERROR: do not compile with CI_LAST < CI_ENVRCPT
#endif
#if CI_LAST < CI_ENVFROM
ERROR: do not compile with CI_LAST < CI_ENVFROM
#endif
#if CI_LAST < CI_HELO
ERROR: do not compile with CI_LAST < CI_HELO
#endif
#if CI_LAST < CI_CONNECT
ERROR: do not compile with CI_LAST < CI_CONNECT
#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 /* _FFR_WORKERS_POOL */
/* 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_ARG0, ST_ABRT, CT_CONT, CI_NONE, st_abortfct }
, {SMFIC_MACRO, CM_ARGV, ST_NONE, CT_KEEP, CI_NONE, st_macros }
, {SMFIC_BODY, CM_ARG1, ST_BODY, CT_CONT, CI_NONE, st_bodychunk }
, {SMFIC_CONNECT, CM_ARG2, ST_CONN, CT_CONT, CI_CONN, st_connectinfo }
, {SMFIC_BODYEOB, CM_ARG1, ST_ENDM, CT_CONT, CI_EOM, st_bodyend }
, {SMFIC_HELO, CM_ARG1, ST_HELO, CT_CONT, CI_HELO, st_helo }
, {SMFIC_HEADER, CM_ARG2, ST_HDRS, CT_CONT, CI_NONE, st_header }
, {SMFIC_MAIL, CM_ARGV, ST_MAIL, CT_CONT, CI_MAIL, st_sender }
, {SMFIC_OPTNEG, CM_ARGO, ST_OPTS, CT_CONT, CI_NONE, st_optionneg }
, {SMFIC_EOH, CM_ARG0, ST_EOHS, CT_CONT, CI_EOH, st_eoh }
, {SMFIC_QUIT, CM_ARG0, ST_QUIT, CT_END, CI_NONE, st_quit }
, {SMFIC_DATA, CM_ARG0, ST_DATA, CT_CONT, CI_DATA, st_data }
, {SMFIC_RCPT, CM_ARGV, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt }
, {SMFIC_UNKNOWN, CM_ARG1, ST_UNKN, CT_IGNO, CI_NONE, st_unknown }
, {SMFIC_QUIT_NC, CM_ARG0, 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;
}
}
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 /* _FFR_WORKERS_POOL */
)
{
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 /* _FFR_WORKERS_POOL */
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\n",
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);
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 /* _FFR_MILTER_CHECK */
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 /* _FFR_MILTER_CHECK */