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/*
* Copyright (c) 1999-2000 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#ifndef lint
static char id[] = "@(#)$Sendmail: comm.c,v 8.30.4.6 2000/10/05 22:44:01 gshapiro Exp $";
#endif /* ! lint */
#if _FFR_MILTER
#include "libmilter.h"
#define FD_Z FD_ZERO(&readset); \
FD_SET((u_int) sd, &readset); \
FD_ZERO(&excset); \
FD_SET((u_int) sd, &excset)
/*
** MI_RD_CMD -- read a command
**
** Parameters:
** sd -- socket descriptor
** timeout -- maximum time to wait
** cmd -- single character command read from sd
** rlen -- pointer to length of result
** name -- name of milter
**
** Returns:
** buffer with rest of command
** (malloc()ed here, should be free()d)
** hack: encode error in cmd
*/
char *
mi_rd_cmd(sd, timeout, cmd, rlen, name)
socket_t sd;
struct timeval *timeout;
char *cmd;
size_t *rlen;
char *name;
{
ssize_t len;
mi_int32 expl;
ssize_t i;
fd_set readset, excset;
int ret;
int save_errno;
char *buf;
char data[MILTER_LEN_BYTES + 1];
*cmd = '\0';
*rlen = 0;
if (sd >= FD_SETSIZE)
{
smi_log(SMI_LOG_ERR, "%s: fd %d is larger than FD_SETSIZE %d",
name, sd, FD_SETSIZE);
*cmd = SMFIC_SELECT;
return NULL;
}
FD_Z;
i = 0;
while ((ret = select(sd + 1, &readset, NULL, &excset, timeout)) >= 1)
{
if (FD_ISSET(sd, &excset))
{
*cmd = SMFIC_SELECT;
return NULL;
}
if ((len = MI_SOCK_READ(sd, data + i, sizeof data - i)) < 0)
{
smi_log(SMI_LOG_ERR,
"%s, mi_rd_cmd: read returned %d: %s",
name, len, strerror(errno));
*cmd = SMFIC_RECVERR;
return NULL;
}
if (len == 0)
{
*cmd = SMFIC_EOF;
return NULL;
}
if (len >= (ssize_t) sizeof data - i)
break;
i += len;
FD_Z;
}
if (ret == 0)
{
*cmd = SMFIC_TIMEOUT;
return NULL;
}
else if (ret < 0)
{
smi_log(SMI_LOG_ERR,
"%s: mi_rd_cmd: select returned %d: %s",
name, ret, strerror(errno));
*cmd = SMFIC_RECVERR;
return NULL;
}
*cmd = data[MILTER_LEN_BYTES];
data[MILTER_LEN_BYTES] = '\0';
(void) memcpy((void *) &expl, (void *) &(data[0]), MILTER_LEN_BYTES);
expl = ntohl(expl) - 1;
if (expl <= 0)
return NULL;
if (expl > MILTER_CHUNK_SIZE)
{
*cmd = SMFIC_TOOBIG;
return NULL;
}
buf = malloc(expl);
if (buf == NULL)
{
*cmd = SMFIC_MALLOC;
return NULL;
}
i = 0;
FD_Z;
while ((ret = select(sd + 1, &readset, NULL, &excset, timeout)) == 1)
{
if (FD_ISSET(sd, &excset))
{
*cmd = SMFIC_SELECT;
free(buf);
return NULL;
}
if ((len = MI_SOCK_READ(sd, buf + i, expl - i)) < 0)
{
smi_log(SMI_LOG_ERR,
"%s: mi_rd_cmd: read returned %d: %s",
name, len, strerror(errno));
ret = -1;
break;
}
if (len == 0)
{
*cmd = SMFIC_EOF;
free(buf);
return NULL;
}
if (len > expl - i)
{
*cmd = SMFIC_RECVERR;
free(buf);
return NULL;
}
if (len >= expl - i)
{
*rlen = expl;
return buf;
}
i += len;
FD_Z;
}
save_errno = errno;
free(buf);
/* select returned 0 (timeout) or < 0 (error) */
if (ret == 0)
{
*cmd = SMFIC_TIMEOUT;
return NULL;
}
if (ret < 0)
{
smi_log(SMI_LOG_ERR,
"%s: mi_rd_cmd: select returned %d: %s",
name, ret, strerror(save_errno));
*cmd = SMFIC_RECVERR;
return NULL;
}
*cmd = SMFIC_UNKNERR;
return NULL;
}
/*
** MI_WR_CMD -- write a cmd to sd
**
** Parameters:
** sd -- socket descriptor
** timeout -- maximum time to wait (currently unused)
** cmd -- single character command to write
** buf -- buffer with further data
** len -- length of buffer (without cmd!)
**
** Returns:
** MI_SUCCESS/MI_FAILURE
*/
int
mi_wr_cmd(sd, timeout, cmd, buf, len)
socket_t sd;
struct timeval *timeout;
int cmd;
char *buf;
size_t len;
{
size_t sl, i;
ssize_t l;
mi_int32 nl;
int ret;
fd_set wrtset;
char data[MILTER_LEN_BYTES + 1];
if (len > MILTER_CHUNK_SIZE)
return MI_FAILURE;
nl = htonl(len + 1); /* add 1 for the cmd char */
(void) memcpy(data, (void *) &nl, MILTER_LEN_BYTES);
data[MILTER_LEN_BYTES] = (char) cmd;
i = 0;
sl = MILTER_LEN_BYTES + 1;
do
{
FD_ZERO(&wrtset);
FD_SET((u_int) sd, &wrtset);
if ((ret = select(sd + 1, NULL, &wrtset, NULL, timeout)) == 0)
return MI_FAILURE;
} while (ret < 0 && errno == EINTR);
if (ret < 0)
return MI_FAILURE;
/* use writev() instead to send the whole stuff at once? */
while ((l = MI_SOCK_WRITE(sd, (void *) (data + i),
sl - i)) < (ssize_t) sl)
{
if (l < 0)
return MI_FAILURE;
i += l;
sl -= l;
}
if (len > 0 && buf == NULL)
return MI_FAILURE;
if (len == 0 || buf == NULL)
return MI_SUCCESS;
i = 0;
sl = len;
do
{
FD_ZERO(&wrtset);
FD_SET((u_int) sd, &wrtset);
if ((ret = select(sd + 1, NULL, &wrtset, NULL, timeout)) == 0)
return MI_FAILURE;
} while (ret < 0 && errno == EINTR);
if (ret < 0)
return MI_FAILURE;
while ((l = MI_SOCK_WRITE(sd, (void *) (buf + i),
sl - i)) < (ssize_t) sl)
{
if (l < 0)
return MI_FAILURE;
i += l;
sl -= l;
}
return MI_SUCCESS;
}
#endif /* _FFR_MILTER */
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