649 lines
13 KiB
C
649 lines
13 KiB
C
/*
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* Copyright (c) 1999-2004 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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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: smfi.c,v 8.73 2004/09/20 21:26:57 ca Exp $")
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#include <sm/varargs.h>
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#include "libmilter.h"
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static int smfi_header __P((SMFICTX *, int, int, char *, char *));
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static int myisenhsc __P((const char *, int));
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/* for smfi_set{ml}reply, let's be generous. 256/16 should be sufficient */
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#define MAXREPLYLEN 980 /* max. length of a reply string */
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#define MAXREPLIES 32 /* max. number of reply strings */
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/*
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** SMFI_HEADER -- send a header to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** cmd -- Header modification command
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** hdridx -- Header index
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** headerf -- Header field name
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** headerv -- Header field value
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**
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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static int
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smfi_header(ctx, cmd, hdridx, headerf, headerv)
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SMFICTX *ctx;
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int cmd;
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int hdridx;
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char *headerf;
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char *headerv;
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{
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size_t len, l1, l2, offset;
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int r;
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mi_int32 v;
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char *buf;
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struct timeval timeout;
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if (headerf == NULL || *headerf == '\0' || headerv == NULL)
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return MI_FAILURE;
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timeout.tv_sec = ctx->ctx_timeout;
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timeout.tv_usec = 0;
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l1 = strlen(headerf) + 1;
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l2 = strlen(headerv) + 1;
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len = l1 + l2;
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if (hdridx >= 0)
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len += MILTER_LEN_BYTES;
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buf = malloc(len);
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if (buf == NULL)
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return MI_FAILURE;
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offset = 0;
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if (hdridx >= 0)
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{
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v = htonl(hdridx);
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(void) memcpy(&(buf[0]), (void *) &v, MILTER_LEN_BYTES);
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offset += MILTER_LEN_BYTES;
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}
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(void) memcpy(buf + offset, headerf, l1);
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(void) memcpy(buf + offset + l1, headerv, l2);
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r = mi_wr_cmd(ctx->ctx_sd, &timeout, cmd, buf, len);
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free(buf);
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return r;
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}
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/*
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** SMFI_ADDHEADER -- send a new header to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** headerf -- Header field name
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** headerv -- Header field value
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_addheader(ctx, headerf, headerv)
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SMFICTX *ctx;
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char *headerf;
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char *headerv;
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{
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if (!mi_sendok(ctx, SMFIF_ADDHDRS))
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return MI_FAILURE;
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return smfi_header(ctx, SMFIR_ADDHEADER, -1, headerf, headerv);
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}
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/*
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** SMFI_INSHEADER -- send a new header to the MTA (to be inserted)
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**
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** Parameters:
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** ctx -- Opaque context structure
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** hdridx -- index into header list where insertion should occur
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** headerf -- Header field name
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** headerv -- Header field value
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_insheader(ctx, hdridx, headerf, headerv)
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SMFICTX *ctx;
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int hdridx;
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char *headerf;
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char *headerv;
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{
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if (!mi_sendok(ctx, SMFIF_ADDHDRS) || hdridx < 0)
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return MI_FAILURE;
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return smfi_header(ctx, SMFIR_INSHEADER, hdridx, headerf, headerv);
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}
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/*
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** SMFI_CHGHEADER -- send a changed header to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** headerf -- Header field name
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** hdridx -- Header index value
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** headerv -- Header field value
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_chgheader(ctx, headerf, hdridx, headerv)
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SMFICTX *ctx;
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char *headerf;
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mi_int32 hdridx;
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char *headerv;
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{
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if (!mi_sendok(ctx, SMFIF_CHGHDRS) || hdridx < 0)
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return MI_FAILURE;
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if (headerv == NULL)
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headerv = "";
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return smfi_header(ctx, SMFIR_CHGHEADER, hdridx, headerf, headerv);
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}
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/*
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** SMFI_ADDRCPT -- send an additional recipient to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** rcpt -- recipient address
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_addrcpt(ctx, rcpt)
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SMFICTX *ctx;
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char *rcpt;
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{
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size_t len;
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struct timeval timeout;
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if (rcpt == NULL || *rcpt == '\0')
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return MI_FAILURE;
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if (!mi_sendok(ctx, SMFIF_ADDRCPT))
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return MI_FAILURE;
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timeout.tv_sec = ctx->ctx_timeout;
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timeout.tv_usec = 0;
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len = strlen(rcpt) + 1;
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return mi_wr_cmd(ctx->ctx_sd, &timeout, SMFIR_ADDRCPT, rcpt, len);
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}
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/*
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** SMFI_DELRCPT -- send a recipient to be removed to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** rcpt -- recipient address
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_delrcpt(ctx, rcpt)
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SMFICTX *ctx;
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char *rcpt;
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{
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size_t len;
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struct timeval timeout;
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if (rcpt == NULL || *rcpt == '\0')
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return MI_FAILURE;
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if (!mi_sendok(ctx, SMFIF_DELRCPT))
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return MI_FAILURE;
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timeout.tv_sec = ctx->ctx_timeout;
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timeout.tv_usec = 0;
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len = strlen(rcpt) + 1;
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return mi_wr_cmd(ctx->ctx_sd, &timeout, SMFIR_DELRCPT, rcpt, len);
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}
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/*
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** SMFI_REPLACEBODY -- send a body chunk to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** bodyp -- body chunk
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** bodylen -- length of body chunk
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_replacebody(ctx, bodyp, bodylen)
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SMFICTX *ctx;
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unsigned char *bodyp;
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int bodylen;
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{
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int len, off, r;
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struct timeval timeout;
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if (bodylen < 0 ||
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(bodyp == NULL && bodylen > 0))
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return MI_FAILURE;
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if (!mi_sendok(ctx, SMFIF_CHGBODY))
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return MI_FAILURE;
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timeout.tv_sec = ctx->ctx_timeout;
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timeout.tv_usec = 0;
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/* split body chunk if necessary */
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off = 0;
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while (bodylen > 0)
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{
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len = (bodylen >= MILTER_CHUNK_SIZE) ? MILTER_CHUNK_SIZE :
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bodylen;
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if ((r = mi_wr_cmd(ctx->ctx_sd, &timeout, SMFIR_REPLBODY,
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(char *) (bodyp + off), len)) != MI_SUCCESS)
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return r;
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off += len;
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bodylen -= len;
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}
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return MI_SUCCESS;
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}
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/*
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** SMFI_QUARANTINE -- quarantine an envelope
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**
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** Parameters:
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** ctx -- Opaque context structure
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** reason -- why?
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_quarantine(ctx, reason)
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SMFICTX *ctx;
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char *reason;
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{
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size_t len;
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int r;
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char *buf;
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struct timeval timeout;
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if (reason == NULL || *reason == '\0')
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return MI_FAILURE;
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if (!mi_sendok(ctx, SMFIF_QUARANTINE))
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return MI_FAILURE;
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timeout.tv_sec = ctx->ctx_timeout;
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timeout.tv_usec = 0;
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len = strlen(reason) + 1;
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buf = malloc(len);
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if (buf == NULL)
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return MI_FAILURE;
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(void) memcpy(buf, reason, len);
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r = mi_wr_cmd(ctx->ctx_sd, &timeout, SMFIR_QUARANTINE, buf, len);
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free(buf);
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return r;
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}
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/*
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** MYISENHSC -- check whether a string contains an enhanced status code
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**
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** Parameters:
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** s -- string with possible enhanced status code.
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** delim -- delim for enhanced status code.
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**
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** Returns:
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** 0 -- no enhanced status code.
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** >4 -- length of enhanced status code.
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**
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** Side Effects:
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** none.
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*/
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static int
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myisenhsc(s, delim)
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const char *s;
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int delim;
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{
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int l, h;
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if (s == NULL)
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return 0;
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if (!((*s == '2' || *s == '4' || *s == '5') && s[1] == '.'))
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return 0;
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h = 0;
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l = 2;
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while (h < 3 && isascii(s[l + h]) && isdigit(s[l + h]))
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++h;
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if (h == 0 || s[l + h] != '.')
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return 0;
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l += h + 1;
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h = 0;
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while (h < 3 && isascii(s[l + h]) && isdigit(s[l + h]))
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++h;
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if (h == 0 || s[l + h] != delim)
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return 0;
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return l + h;
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}
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/*
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** SMFI_SETREPLY -- set the reply code for the next reply to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** rcode -- The three-digit (RFC 821) SMTP reply code.
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** xcode -- The extended (RFC 2034) reply code.
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** message -- The text part of the SMTP reply.
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_setreply(ctx, rcode, xcode, message)
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SMFICTX *ctx;
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char *rcode;
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char *xcode;
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char *message;
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{
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size_t len;
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char *buf;
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if (rcode == NULL || ctx == NULL)
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return MI_FAILURE;
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/* ### <sp> \0 */
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len = strlen(rcode) + 2;
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if (len != 5)
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return MI_FAILURE;
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if ((rcode[0] != '4' && rcode[0] != '5') ||
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!isascii(rcode[1]) || !isdigit(rcode[1]) ||
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!isascii(rcode[2]) || !isdigit(rcode[2]))
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return MI_FAILURE;
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if (xcode != NULL)
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{
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if (!myisenhsc(xcode, '\0'))
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return MI_FAILURE;
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len += strlen(xcode) + 1;
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}
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if (message != NULL)
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{
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size_t ml;
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/* XXX check also for unprintable chars? */
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if (strpbrk(message, "\r\n") != NULL)
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return MI_FAILURE;
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ml = strlen(message);
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if (ml > MAXREPLYLEN)
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return MI_FAILURE;
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len += ml + 1;
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}
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buf = malloc(len);
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if (buf == NULL)
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return MI_FAILURE; /* oops */
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(void) sm_strlcpy(buf, rcode, len);
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(void) sm_strlcat(buf, " ", len);
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if (xcode != NULL)
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(void) sm_strlcat(buf, xcode, len);
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if (message != NULL)
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{
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if (xcode != NULL)
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(void) sm_strlcat(buf, " ", len);
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(void) sm_strlcat(buf, message, len);
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}
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if (ctx->ctx_reply != NULL)
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free(ctx->ctx_reply);
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ctx->ctx_reply = buf;
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return MI_SUCCESS;
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}
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/*
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** SMFI_SETMLREPLY -- set multiline reply code for the next reply to the MTA
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**
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** Parameters:
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** ctx -- Opaque context structure
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** rcode -- The three-digit (RFC 821) SMTP reply code.
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** xcode -- The extended (RFC 2034) reply code.
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** txt, ... -- The text part of the SMTP reply,
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** MUST be terminated with NULL.
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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#if SM_VA_STD
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smfi_setmlreply(SMFICTX *ctx, const char *rcode, const char *xcode, ...)
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#else /* SM_VA_STD */
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smfi_setmlreply(ctx, rcode, xcode, va_alist)
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SMFICTX *ctx;
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const char *rcode;
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const char *xcode;
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va_dcl
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#endif /* SM_VA_STD */
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{
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size_t len;
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size_t rlen;
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int args;
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char *buf, *txt;
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const char *xc;
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char repl[16];
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SM_VA_LOCAL_DECL
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if (rcode == NULL || ctx == NULL)
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return MI_FAILURE;
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/* ### <sp> */
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len = strlen(rcode) + 1;
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if (len != 4)
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return MI_FAILURE;
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if ((rcode[0] != '4' && rcode[0] != '5') ||
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!isascii(rcode[1]) || !isdigit(rcode[1]) ||
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!isascii(rcode[2]) || !isdigit(rcode[2]))
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return MI_FAILURE;
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if (xcode != NULL)
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{
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if (!myisenhsc(xcode, '\0'))
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return MI_FAILURE;
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xc = xcode;
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}
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else
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{
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if (rcode[0] == '4')
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xc = "4.0.0";
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else
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xc = "5.0.0";
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}
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/* add trailing space */
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len += strlen(xc) + 1;
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rlen = len;
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args = 0;
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SM_VA_START(ap, xcode);
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while ((txt = SM_VA_ARG(ap, char *)) != NULL)
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{
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size_t tl;
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tl = strlen(txt);
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if (tl > MAXREPLYLEN)
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break;
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/* this text, reply codes, \r\n */
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len += tl + 2 + rlen;
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if (++args > MAXREPLIES)
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break;
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/* XXX check also for unprintable chars? */
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if (strpbrk(txt, "\r\n") != NULL)
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break;
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}
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SM_VA_END(ap);
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if (txt != NULL)
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return MI_FAILURE;
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/* trailing '\0' */
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++len;
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buf = malloc(len);
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if (buf == NULL)
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return MI_FAILURE; /* oops */
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(void) sm_strlcpyn(buf, len, 3, rcode, args == 1 ? " " : "-", xc);
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(void) sm_strlcpyn(repl, sizeof repl, 4, rcode, args == 1 ? " " : "-",
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xc, " ");
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SM_VA_START(ap, xcode);
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txt = SM_VA_ARG(ap, char *);
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if (txt != NULL)
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{
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(void) sm_strlcat2(buf, " ", txt, len);
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while ((txt = SM_VA_ARG(ap, char *)) != NULL)
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{
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if (--args <= 1)
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repl[3] = ' ';
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(void) sm_strlcat2(buf, "\r\n", repl, len);
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(void) sm_strlcat(buf, txt, len);
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}
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}
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if (ctx->ctx_reply != NULL)
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free(ctx->ctx_reply);
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ctx->ctx_reply = buf;
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SM_VA_END(ap);
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return MI_SUCCESS;
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}
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/*
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** SMFI_SETPRIV -- set private data
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**
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** Parameters:
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** ctx -- Opaque context structure
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** privatedata -- pointer to private data
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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smfi_setpriv(ctx, privatedata)
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SMFICTX *ctx;
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void *privatedata;
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{
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if (ctx == NULL)
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return MI_FAILURE;
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ctx->ctx_privdata = privatedata;
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return MI_SUCCESS;
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}
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/*
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** SMFI_GETPRIV -- get private data
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**
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** Parameters:
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** ctx -- Opaque context structure
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**
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** Returns:
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** pointer to private data
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*/
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void *
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smfi_getpriv(ctx)
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SMFICTX *ctx;
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{
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if (ctx == NULL)
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return NULL;
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return ctx->ctx_privdata;
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}
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/*
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** SMFI_GETSYMVAL -- get the value of a macro
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**
|
|
** See explanation in mfapi.h about layout of the structures.
|
|
**
|
|
** Parameters:
|
|
** ctx -- Opaque context structure
|
|
** symname -- name of macro
|
|
**
|
|
** Returns:
|
|
** value of macro (NULL in case of failure)
|
|
*/
|
|
|
|
char *
|
|
smfi_getsymval(ctx, symname)
|
|
SMFICTX *ctx;
|
|
char *symname;
|
|
{
|
|
int i;
|
|
char **s;
|
|
char one[2];
|
|
char braces[4];
|
|
|
|
if (ctx == NULL || symname == NULL || *symname == '\0')
|
|
return NULL;
|
|
|
|
if (strlen(symname) == 3 && symname[0] == '{' && symname[2] == '}')
|
|
{
|
|
one[0] = symname[1];
|
|
one[1] = '\0';
|
|
}
|
|
else
|
|
one[0] = '\0';
|
|
if (strlen(symname) == 1)
|
|
{
|
|
braces[0] = '{';
|
|
braces[1] = *symname;
|
|
braces[2] = '}';
|
|
braces[3] = '\0';
|
|
}
|
|
else
|
|
braces[0] = '\0';
|
|
|
|
/* search backwards through the macro array */
|
|
for (i = MAX_MACROS_ENTRIES - 1 ; i >= 0; --i)
|
|
{
|
|
if ((s = ctx->ctx_mac_ptr[i]) == NULL ||
|
|
ctx->ctx_mac_buf[i] == NULL)
|
|
continue;
|
|
while (s != NULL && *s != NULL)
|
|
{
|
|
if (strcmp(*s, symname) == 0)
|
|
return *++s;
|
|
if (one[0] != '\0' && strcmp(*s, one) == 0)
|
|
return *++s;
|
|
if (braces[0] != '\0' && strcmp(*s, braces) == 0)
|
|
return *++s;
|
|
++s; /* skip over macro value */
|
|
++s; /* points to next macro name */
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
** SMFI_PROGRESS -- send "progress" message to the MTA to prevent premature
|
|
** timeouts during long milter-side operations
|
|
**
|
|
** Parameters:
|
|
** ctx -- Opaque context structure
|
|
**
|
|
** Return value:
|
|
** MI_SUCCESS/MI_FAILURE
|
|
*/
|
|
|
|
int
|
|
smfi_progress(ctx)
|
|
SMFICTX *ctx;
|
|
{
|
|
struct timeval timeout;
|
|
|
|
if (ctx == NULL)
|
|
return MI_FAILURE;
|
|
|
|
timeout.tv_sec = ctx->ctx_timeout;
|
|
timeout.tv_usec = 0;
|
|
|
|
return mi_wr_cmd(ctx->ctx_sd, &timeout, SMFIR_PROGRESS, NULL, 0);
|
|
}
|