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callbacks.c
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callbacks.c
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/*
* signing-milter - callbacks.c
* Copyright (C) 2010-2020 Andreas Schulze
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; only version 2 of the License is applicable.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Authors:
* Andreas Schulze <signing-milter at andreasschulze.de>
*
*/
#include "callbacks.h"
struct smfiDesc callbacks = {
STR_PROGNAME, /* filter name */
SMFI_VERSION, /* version code -- do not change */
SMFIF_ADDHDRS |
SMFIF_CHGHDRS |
SMFIF_CHGBODY, /* filter actions */
NULL, /* connection info filter */
NULL, /* SMTP HELO command filter */
callback_envfrom, /* envelope sender filter */
callback_envrcpt, /* envelope recipient filter */
callback_header, /* header filter */
callback_eoh, /* end of header */
callback_body, /* body block filter */
callback_eom, /* end of message */
callback_abort, /* message aborted */
callback_close, /* connection cleanup */
NULL, /* any unrecognized or unimplemented command filter */
NULL, /* SMTP DATA command filter */
NULL /* negotiation callback */
};
/*
* called once at the beginning of each message (MAIL command),
* before xxfi_envrcpt.
*
* argv: Null-terminated SMTP command arguments;
* argv[0] is guaranteed to be the sender address.
* Later arguments are the ESMTP arguments.
*
* Wird möglicherweise mehrfach innerhalb einer Verbindung
* aufgerufen. Könnte also sein. das ctxdata schon befüllt ist.
*
*/
sfsistat callback_envfrom(SMFICTX* ctx, char** argv) {
const char* pemfilename = NULL;
CTXDATA* ctxdata;
char* daemon_name;
int i;
if ((daemon_name = smfi_getsymval(ctx, "{daemon_name}")) == NULL) {
daemon_name = "smfi_getsymval(daemon_name) failed";
logmsg(LOG_WARNING, "warning: callback_envfrom smfi_getsymval(daemon_name) failed, continue");
}
/*
* emty sender has different representations.
* in smtpd_milter it is '<>'
* in non_smtpd_milter it is ''
*/
logmsg(LOG_DEBUG, "MAIL FROM: '%s' (via %s)", argv[0], daemon_name);
/*
* Testen, ob die Tabelle aktuell ist.
* TODO: automaischer reload
*/
warn_if_dict_changed(&dict_signingtable);
pemfilename = dict_lookup(&dict_signingtable, argv[0]);
if (pemfilename == NULL || *pemfilename == '\0') {
/*
* Absender nicht in der Signingtable gefunden.
* keine weitere Aktion noetig.
*/
if (opt_signerfromheader) {
logmsg(LOG_DEBUG, "no cert for envsender, will look for '%s'", HEADERNAME_SIGNER);
} else {
logmsg(LOG_INFO, "no signingdata for '%s'", argv[0]);
return SMFIS_ACCEPT;
}
}
/*
* Private Datenstruktur vorbereiten
*/
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) != NULL) {
/* eigentlich LOG_INFO / unbedeutend, aber ich möchte das mal im Log sehen */
logmsg(LOG_WARNING, "callback_envfrom: REUSED CONNECTION !!!!");
ctxdata_cleanup(ctxdata);
} else {
if ((ctxdata = ctxdata_create()) == NULL)
return SMFIS_TEMPFAIL;
}
if (pemfilename != NULL && *pemfilename != '\0') {
logmsg(LOG_INFO, "signingdata from envsender '%s'", argv[0]);
if ((i = ctxdata_setup(ctxdata, pemfilename)) != 0) {
logmsg(LOG_ERR, "callback_envfrom: ctxdata_setup() failed: rc=%i, envsender='%s', file=%s", i, argv[0], pemfilename);
return SMFIS_TEMPFAIL;
}
}
/*
* save the private data
*/
if (smfi_setpriv(ctx, ctxdata) != MI_SUCCESS) {
logmsg(LOG_ERR, "error: callback_envfrom: setpriv failed, envsender='%s'", argv[0]);
return SMFIS_TEMPFAIL;
}
return SMFIS_CONTINUE;
}
sfsistat callback_envrcpt(SMFICTX* ctx, char** argv) {
CTXDATA* ctxdata;
if (!opt_modetable)
return SMFIS_CONTINUE;
logmsg(LOG_DEBUG, "RCPT TO: %s", argv[0]);
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_envrcpt: context is not set, continue");
return SMFIS_CONTINUE;
}
dump_mailflags(ctxdata->mailflags);
dump_pkcs7flags(ctxdata->pkcs7flags);
warn_if_dict_changed(&dict_modetable);
dict_lookup(&dict_modetable, argv[0]);
if (dict_modetable.result != NULL && *dict_modetable.result != '\0') {
/*
* Empfaenger in der modetable gefunden.
* Ergebnis gilt fuer *alle* Empfaenger.
*/
logmsg(LOG_DEBUG, "callback_envrcpt: %s found in modetable: value='%s'", argv[0], dict_modetable.result);
if (strstr(dict_modetable.result, "skip") != NULL) {
logmsg(LOG_INFO, "modetable hit: skip signing for %s", argv[0]);
/* TODO: muss hier noch Speicher freigegeben werden? */
return SMFIS_ACCEPT;
}
if (strstr(dict_modetable.result, "opaque") != NULL) {
logmsg(LOG_DEBUG, "callback_envrcpt: opaque signingmode enabled for %s", argv[0]);
ctxdata->mailflags |= MF_SIGNMODE_OPAQUE;
}
if (strstr(dict_modetable.result, "keep") != NULL) {
logmsg(LOG_INFO, "modetable hit: keep message for %s in /tmp", argv[0]);
ctxdata->keepdir = "/tmp";
}
}
dump_mailflags(ctxdata->mailflags);
dump_pkcs7flags(ctxdata->pkcs7flags);
return SMFIS_CONTINUE;
}
/*
* called once for each message header.
* headerf: Header field name.
* headerv: Header field value. The content of the header may include folded white space,
* i.e., multiple lines with following white space where lines are separated by LF (not CR/LF).
* The trailing line terminator (CR/LF) is removed.
*
* Starting with sendmail 8.14, spaces after the colon in a header field are preserved
* if requested using the flag SMFIP_HDR_LEADSPC
* -> https://www.milter.org/developers/api/xxfi_header
*/
sfsistat callback_header(SMFICTX* ctx, char* headerf, char* headerv) {
CTXDATA* ctxdata;
NODE* n;
int i;
/* logmsg(LOG_DEBUG, "HEADER: %s %s", headerf, headerv);*/
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_header: context is not set, continue");
return SMFIS_CONTINUE;
}
if (!ctxdata->queueid) {
if ((ctxdata->queueid = smfi_getsymval(ctx, "{i}")) == NULL) {
ctxdata->queueid = "unknown";
logmsg(LOG_WARNING, "%s: warning: callback_header: smfi_getsymval(queueid) failed", ctxdata->queueid);
}
logmsg(LOG_INFO, "callback_header: got queuid: %s", ctxdata->queueid);
}
if (strcasecmp(headerf, "mime-version") == 0) {
logmsg(LOG_DEBUG, "callback_header: Mime-Mail erkannt");
ctxdata->mailflags |= MF_TYPE_MIME;
}
/*
* RFC 2045 definiert
* Content-Type, Content-Transfer-Encoding, Content-ID und Content-Description
* Abschnitt 9 legt fest, dass alle Erweiterungen mit content- beginnen werden
*/
if (strncasecmp(headerf, "content-", 8) == 0) {
/*
* schon signierte Nachrichten brauchen nicht weiter
* bearbeitet werden
* TODO: die Erkennung, ob eine Mail schon signiert ist,
* ist sicher noch nocht perfekt
*/
if (is_already_signed(headerf, headerv)) {
logmsg(LOG_NOTICE, "mail seemes already signed.");
return SMFIS_ACCEPT;
}
if (is_multipart_mime(headerf, headerv)) {
logmsg(LOG_DEBUG, "callback_header: multipart Mime-Mail erkannt");
ctxdata->mailflags |= MF_TYPE_MULTIPART;
}
if ((n = newnode(headerf, headerv, PHASE_PRE_SIGN)) == NULL) {
logmsg(LOG_ERR, "error: callback_header: alloc new node failed");
return SMFIS_TEMPFAIL;
}
appendnode(&(ctxdata->headerchain), n);
}
if (!opt_signerfromheader)
return SMFIS_CONTINUE;
if (strcasecmp(headerf, HEADERNAME_SIGNER) == 0) {
const char* pemfilename;
logmsg(LOG_DEBUG, "callback_header: signerfrom_header: %s", headerv);
/*
* Testen, ob die Tabelle aktuell ist.
* TODO: automatischer reload
*/
warn_if_dict_changed(&dict_signingtable);
pemfilename = dict_lookup(&dict_signingtable, headerv);
if (pemfilename == NULL || *pemfilename == '\0') {
/*
* Absender nicht in der Signingtable gefunden.
* keine weitere Aktion noetig.
*/
logmsg(LOG_INFO, "no signingdata for %s", headerv);
return SMFIS_ACCEPT;
}
if ((i = ctxdata_setup(ctxdata, pemfilename)) != 0) {
logmsg(LOG_ERR, "callback_header: ctxdata_setup() failed: rc=%i, headerf=, headerv=, file=%s", i, headerf, headerv, pemfilename);
return SMFIS_TEMPFAIL;
}
/*
* Headerfeld muss in callback_eom geloescht werden
*/
ctxdata->mailflags |= MF_SIGNER_FROM_HEADER;
}
return SMFIS_CONTINUE;
}
sfsistat callback_eoh(SMFICTX* ctx) {
CTXDATA* ctxdata;
logmsg(LOG_DEBUG, "EOH");
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_eoh: context is not set, continue");
return SMFIS_CONTINUE;
}
/*
* Nach dem DATA steht die QueueID fest. Da dieser Milter kein
* callback beim DATA-Kommano implementiert, ist dies der erste
* callback, wo die QueueID abrufbar ist.
*/
if (!ctxdata->queueid) {
if ((ctxdata->queueid = smfi_getsymval(ctx, "{i}")) == NULL) {
ctxdata->queueid = "unknown";
logmsg(LOG_WARNING, "%s: warning: callback_eoh: smfi_getsymval(queueid) failed", ctxdata->queueid);
}
}
/* RFC 2045: MIME-Version Header ist Pflicht, wenn Content-* Header benutzt werden */
if ( (ctxdata->headerchain != NULL) && ((ctxdata->mailflags & MF_TYPE_MIME) == 0) ) {
char reply[] = "invalid Content: no 'MIME-Version' header but 'Content-*' header found. That violates RFC 2045";
logmsg(LOG_ERR, "%s: callback_eoh: %s", ctxdata->queueid, reply);
smfi_setreply(ctx, "550", "5.6.0", reply);
return SMFIS_REJECT;
}
/*
* only a MIME-Version header present, no Content-* header
* https://tools.ietf.org/html/rfc2045#section-5.2 mention an implicit default
*/
if ( (ctxdata->headerchain == NULL) && ((ctxdata->mailflags & MF_TYPE_MIME) != 0) ) {
NODE* n;
char* headerf = "Content-Type";
char* headerv = "text/plain; charset=\"us-ascii\"";
logmsg(LOG_WARNING, "%s: malformed Content: 'MIME-Version' header but no 'Content-*' header found. Please read RFC 2045, Section 5.2. Adding '%s: %s'" , ctxdata->queueid, headerf, headerv);
if ((n = newnode(headerf, headerv, PHASE_PRE_SIGN)) == NULL) {
logmsg(LOG_ERR, "error: callback_eoh: alloc new node failed");
return SMFIS_TEMPFAIL;
}
appendnode(&(ctxdata->headerchain), n);
}
dump_mailflags(ctxdata->mailflags);
dump_pkcs7flags(ctxdata->pkcs7flags);
if (opt_signerfromheader && ctxdata->pemfilename == NULL) {
logmsg(LOG_INFO, "%s: callback_eoh: no signingdata ...", ctxdata->queueid);
return SMFIS_ACCEPT;
}
if ((headerchain2signingbuffer(ctx, ctxdata)) != 0) {
logmsg(LOG_ERR, "%s: callback_eoh: headerchain2signingbuffer failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
if (ctxdata->mailflags & MF_SIGNMODE_OPAQUE) {
ctxdata->pkcs7flags &= ~PKCS7_DETACHED;
ctxdata->pkcs7flags &= ~PKCS7_STREAM;
}
dump_mailflags(ctxdata->mailflags);
dump_pkcs7flags(ctxdata->pkcs7flags);
return SMFIS_CONTINUE;
}
sfsistat callback_body(SMFICTX* ctx, unsigned char* bodyp, size_t len) {
CTXDATA* ctxdata;
unsigned char* start = bodyp;
unsigned char* next_c;
size_t length = len;
logmsg(LOG_DEBUG, "BODY (%i byte)", len);
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_body: context is not set, continue");
return SMFIS_CONTINUE;
}
/*
* wenn die Mail eine Multipart-Mime-Mail ist,
* beginnt sie mit einer Preambel ( RFC 2046, 5.1.1 )
* diese Preambel endet mit der ersten Boundary ( ^-- ) und wird nicht in die Signatur einbezogen.
*/
if ((ctxdata->first_bodychunk_seen == 0) && (ctxdata->mailflags & MF_TYPE_MULTIPART)) {
/* erster Chunk */
ctxdata->first_bodychunk_seen = 1;
for(;;) {
while (*start != '-' && length > 0) {
start++;
length--;
}
next_c = start; next_c++;
if (*next_c == '-') break;
start++;
length--;
}
logmsg(LOG_DEBUG, "%s: skip %lu bytes RFC 2046 prolog discarded", ctxdata->queueid, start - bodyp);
}
if ((append2buffer(&(ctxdata->data2sign), &(ctxdata->data2sign_len), (char*) start, length)) != 0) {
logmsg(LOG_ERR, "%s: error: callback_body: append2buffer failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
return SMFIS_CONTINUE;
}
sfsistat callback_eom(SMFICTX* ctx) {
CTXDATA* ctxdata;
BUF_MEM* outmem;
struct timeval start_time, end_time, duration;
char* keepdir;
logmsg(LOG_DEBUG, "EOM");
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_eom: context is not set, continue");
return SMFIS_CONTINUE;
}
/*
* "echo | /usr/sbin/sendmail rcpt" erzeugt Nachrichten mit 0 Byte body
* aber BIO_new_mem_buf mag 0 Byte gar nicht. Also spendieren wir einen Zeilenumbruch
*/
if (0 == ctxdata->data2sign_len) {
if ((append2buffer(&(ctxdata->data2sign), &(ctxdata->data2sign_len), "\r\n", 2)) != 0) {
logmsg(LOG_ERR, "%s: error: callback_eom: append2buffer failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
}
logmsg(LOG_DEBUG, "callback_eom: ctxdata->data2sign_len=%zu", ctxdata->data2sign_len);
/*
* discard/don't sign the optional epilogue
*/
if (ctxdata->mailflags & MF_TYPE_MULTIPART) {
unsigned char* old_end = ctxdata->data2sign + ctxdata->data2sign_len;
unsigned char* new_end;
size_t skipped_epilog_bytes;
int found = 0;
logmsg(LOG_DEBUG, "%s: try discarding optional RFC 2046 epilogue",
ctxdata->queueid);
for (new_end = old_end;
new_end > ctxdata->data2sign;
new_end--) {
/* logmsg(LOG_DEBUG, "%c, %c, %c, %c",
*(new_end-4), *(new_end-3),
*(new_end-2), *(new_end-1)); */
if ( *(new_end-1) == '\n' && *(new_end-2) == '\r'
&& *(new_end-3) == '-' && *(new_end-4) == '-' ) {
skipped_epilog_bytes = old_end - new_end;
found = 1;
if (skipped_epilog_bytes > 0) {
logmsg(LOG_INFO, "%s: %lu bytes RFC 2046 epilogue discarded",
ctxdata->queueid, skipped_epilog_bytes);
}
ctxdata->data2sign_len -= skipped_epilog_bytes;
break;
}
}
if (new_end == ctxdata->data2sign && found == 0) {
logmsg(LOG_WARNING, "%s: callback_eom: strange: RFC 2046 close-delimiter not found", ctxdata->queueid);
}
logmsg(LOG_DEBUG, "callback_eom: ctxdata->data2sign_len=%zu", ctxdata->data2sign_len);
}
gettimeofday(&start_time, NULL);
/*
* Header und Body sind nun komplett im Puffer data2sign.
* Aus diesem Puffer wird nun ein BIO gemacht
*/
if ((ctxdata->inbio = BIO_new_mem_buf(ctxdata->data2sign, ctxdata->data2sign_len)) == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: creating inBIO failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
/* global oder bei Bedarf (modetable) Daten aufheben */
if ((keepdir = opt_keepdir) == NULL) {
keepdir = ctxdata->keepdir;
}
if (keepdir != NULL) {
bio2file(ctxdata->inbio, keepdir, "plain", ctxdata->queueid);
}
dump_mailflags(ctxdata->mailflags);
dump_pkcs7flags(ctxdata->pkcs7flags);
if ((ctxdata->pkcs7 = PKCS7_sign(ctxdata->cert, ctxdata->key, ctxdata->chain, ctxdata->inbio, ctxdata->pkcs7flags)) == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: creating PKCS#7 structure failed, cert=%s", ctxdata->queueid, ctxdata->pemfilename);
return SMFIS_TEMPFAIL;
}
if ((ctxdata->outbio = BIO_new(BIO_s_mem())) == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: creating outBIO failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
if (SMIME_write_PKCS7(ctxdata->outbio, ctxdata->pkcs7, ctxdata->inbio, ctxdata->pkcs7flags) == 0) {
logmsg(LOG_ERR, "%s: error: callback_eom: SMIME_write_PKCS7 failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
gettimeofday(&end_time, NULL);
duration.tv_sec = end_time.tv_sec - start_time.tv_sec;
duration.tv_usec = end_time.tv_usec - start_time.tv_usec;
if(duration.tv_usec < 0) {
duration.tv_usec += 1000000;
duration.tv_sec--;
}
/*
* Content-Type Header nun wirklich löschen
*/
if (delete_marked_headers(ctx, ctxdata) != 0) {
logmsg(LOG_ERR, "%s: error: callback_eom: delete_marked_headers failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
/*
* wenn vorhanden: HEADERNAME_SIGNER loeschen
*/
if (ctxdata->mailflags & MF_SIGNER_FROM_HEADER) {
if (smfi_chgheader(ctx, HEADERNAME_SIGNER, 0, NULL) != MI_SUCCESS) {
logmsg(LOG_ERR, "%s: error: callback_eom: delete Header %s failed, continue", ctxdata->queueid, HEADERNAME_SIGNER);
}
}
if (keepdir != NULL) {
bio2file(ctxdata->outbio, keepdir, "signed", ctxdata->queueid);
}
/*
* aus outbio die neuen MIME-Header rausziehen
*/
for(;;) {
char* headerline;
char* headerf;
char* headerv;
if ((headerline = malloc(MAXHEADERLEN)) == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: allocation of %i byte (MAXHEADERLEN) to read signed data failed", ctxdata->queueid, MAXHEADERLEN);
return SMFIS_TEMPFAIL;
}
if (BIO_gets(ctxdata->outbio, headerline, MAXHEADERLEN) < 0) {
logmsg(LOG_ERR, "%s: error: callback_eom: reading headerline from outBIO failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
/* leere Zeile: header ist komplett */
if ((strcmp(headerline, "\r\n") == 0) || (strcmp(headerline, "\n") == 0)) {
if (headerline)
free(headerline);
break;
}
logmsg(LOG_DEBUG, "%s: Header aus PKCS7: %s", ctxdata->queueid, headerline);
/*
* wenn eine 7bit ASCII Mail signiert wurde, enthielt die keinen MIME-Header
* dann: diesen hier uebernehmen
*/
if ( (strncasecmp(headerline, "mime-version", 12) == 0) &&
((ctxdata->mailflags & MF_TYPE_MIME) != 0) ) {
logmsg(LOG_DEBUG, "%s: skip mime-version header", ctxdata->queueid);
if (headerline)
free(headerline);
continue;
}
/*
* separieren der Zeile in 2 Teile. Dazu wird ':' durch '\0' ersetzt
* und im headerv führende Leerzeichen übersprungen
*/
if ((headerv = separate_header(headerline, &headerf)) == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: separate_header failed", ctxdata->queueid);
if (headerline)
free(headerline);
return SMFIS_TEMPFAIL;
}
if ((headerv = break_after_semicolon(headerv, PHASE_POST_SIGN)) == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: break_after_semicolon failed", ctxdata->queueid);
if (headerline)
free(headerline);
return SMFIS_TEMPFAIL;
}
logmsg(LOG_DEBUG, "%s: separierter, umgebrochener Header: %s:%s", ctxdata->queueid, headerf, headerv);
/*
* nun die Header neu setzen
*/
if ((smfi_addheader(ctx, headerf, headerv)) != MI_SUCCESS) {
logmsg(LOG_ERR, "%s: error: callback_eom: smfi_addheader %s:%s failed", ctxdata->queueid, headerf, headerv);
if (headerline)
free(headerline);
if (headerv)
free(headerv);
return SMFIS_TEMPFAIL;
}
if (headerline)
free(headerline);
if (headerv)
free(headerv);
}
/* dann body replace */
BIO_get_mem_ptr(ctxdata->outbio, &outmem);
if (outmem == NULL) {
logmsg(LOG_ERR, "%s: error: callback_eom: BIO_get_mem_ptr failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
if (smfi_replacebody(ctx, (unsigned char*)(outmem->data), outmem->length) != MI_SUCCESS) {
logmsg(LOG_ERR, "%s: error: callback_eom: replacebody failed", ctxdata->queueid);
return SMFIS_TEMPFAIL;
}
/* BUF_MEM_free(outmem); */
/*
* etwas angeben ...
*/
logmsg(LOG_NOTICE, "%s: %ssigned with %s%s", ctxdata->queueid, ctxdata->mailflags & MF_SIGNMODE_OPAQUE ? "opaque" : "clear", ctxdata->pemfilename, ctxdata->chain != NULL ? " (+chain)" : " (no chain)");
logmsg(LOG_INFO, "%s: signing %ld byte took %d.%d sec", ctxdata->queueid, ctxdata->data2sign_len, duration.tv_sec, duration.tv_usec);
/*
* abschliessend einen X-Header in die Mail stempeln
*/
if (opt_addxheader) {
char xhdr[MAXHEADERLEN + 1];
char* hostname;
bzero(xhdr, sizeof(xhdr));
if ((hostname = smfi_getsymval(ctx, "{j}")) == NULL) {
logmsg(LOG_WARNING, "%s: warning: callback_eom: smfi_getsymval(hostname) failed, cannot addxheader, continue", ctxdata->queueid);
} else {
snprintf(xhdr, MAXHEADERLEN, "%s %s on %s", STR_PROGNAME, STR_PROGVERSION, hostname);
if (smfi_addheader(ctx, HEADERNAME_XHEADER, xhdr) != MI_SUCCESS)
logmsg(LOG_WARNING, "%s: warning: callback_eom: adding X-Header failed, continue", ctxdata->queueid);
}
}
/* Statistik */
inc_stats(&duration);
return SMFIS_CONTINUE;
}
/*
* may be called at any time during message processing
* (i.e. between some message-oriented routine and xxfi_eom).
*/
sfsistat callback_abort(SMFICTX* ctx) {
CTXDATA* ctxdata;
logmsg(LOG_DEBUG, "ABORT");
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_abort: context is not set, continue");
return SMFIS_CONTINUE;
}
ctxdata_cleanup(ctxdata);
return SMFIS_CONTINUE;
}
/*
* always called once at the end of each connection.
*/
sfsistat callback_close(SMFICTX* ctx) {
CTXDATA* ctxdata;
logmsg(LOG_DEBUG, "CLOSE");
if ((ctxdata = (CTXDATA*) smfi_getpriv(ctx)) == NULL) {
logmsg(LOG_DEBUG, "callback_close: context is not set, continue");
return SMFIS_CONTINUE;
}
ctxdata_cleanup(ctxdata);
ctxdata_free(ctxdata);
if (smfi_setpriv(ctx, NULL) != MI_SUCCESS) {
/* NOTE: smfi_setpriv return MI_FAILURE when ctx is NULL */
logmsg(LOG_ERR, "error: callback_close: release milter context failed");
}
return SMFIS_CONTINUE;
}