+++ /dev/null
-/*
- * Utility functions for the Citadel SMTP implementation
- *
- * Copyright (c) 1998-2021 by the citadel.org team
- *
- * This program is open source software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 3.
- *
- * 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.
- */
-
-#include "sysdep.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <termios.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <pwd.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <syslog.h>
-#include <time.h>
-#include <sys/wait.h>
-#include <ctype.h>
-#include <string.h>
-#include <limits.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <libcitadel.h>
-#include "citadel.h"
-#include "server.h"
-#include "citserver.h"
-#include "support.h"
-#include "config.h"
-#include "control.h"
-#include "user_ops.h"
-#include "database.h"
-#include "msgbase.h"
-#include "internet_addressing.h"
-#include "genstamp.h"
-#include "domain.h"
-#include "clientsocket.h"
-#include "locate_host.h"
-#include "citadel_dirs.h"
-#include "ctdl_module.h"
-#include "smtp_util.h"
-
-const char *smtp_get_Recipients(void) {
- struct citsmtp *sSMTP = SMTP;
-
- if (sSMTP == NULL)
- return NULL;
- else return ChrPtr(sSMTP->from);
-}
-
-
-/*
- * smtp_do_bounce() is caled by smtp_process_one_msg() to scan a set of delivery
- * instructions for errors and produce/deliver a "bounce" message (delivery
- * status notification).
- *
- * is_final should be set to:
- * SDB_BOUNCE_FATALS Advise the sender of all 5XX (permanent failures)
- * SDB_BOUNCE_ALL Advise the sender that all deliveries have failed and will not be retried
- * SDB_WARN Warn the sender about all 4XX transient delays
- */
-void smtp_do_bounce(const char *instr, int is_final) {
- int i;
- int lines;
- int status;
- char buf[1024];
- char key[1024];
- char addr[1024];
- char dsn[1024];
- char bounceto[1024];
- StrBuf *boundary;
- int num_bounces = 0;
- int bounce_this = 0;
- struct CtdlMessage *bmsg = NULL;
- struct recptypes *valid;
- int successful_bounce = 0;
- static int seq = 0;
- StrBuf *BounceMB;
- long omsgid = (-1);
-
- syslog(LOG_DEBUG, "smtp_do_bounce() called");
- strcpy(bounceto, "");
- boundary = NewStrBufPlain(HKEY("=_Citadel_Multipart_"));
-
- StrBufAppendPrintf(boundary, "%s_%04x%04x", CtdlGetConfigStr("c_fqdn"), getpid(), ++seq);
-
- /* Start building our bounce message */
-
- bmsg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
- if (bmsg == NULL) return;
- memset(bmsg, 0, sizeof(struct CtdlMessage));
- BounceMB = NewStrBufPlain(NULL, 1024);
-
- bmsg->cm_magic = CTDLMESSAGE_MAGIC;
- bmsg->cm_anon_type = MES_NORMAL;
- bmsg->cm_format_type = FMT_RFC822;
- CM_SetField(bmsg, eAuthor, HKEY("Citadel"));
- CM_SetField(bmsg, eOriginalRoom, HKEY(MAILROOM));
- CM_SetField(bmsg, eMsgSubject, HKEY("Delivery Status Notification (Failure)"));
- StrBufAppendBufPlain(BounceMB, HKEY("Content-type: multipart/mixed; boundary=\""), 0);
- StrBufAppendBuf(BounceMB, boundary, 0);
- StrBufAppendBufPlain(BounceMB, HKEY("\"\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("MIME-Version: 1.0\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("X-Mailer: " CITADEL "\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("\r\nThis is a multipart message in MIME format.\r\n\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
- StrBufAppendBuf(BounceMB, boundary, 0);
- StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("Content-type: text/plain\r\n\r\n"), 0);
-
- if (is_final == SDB_BOUNCE_ALL) {
- StrBufAppendBufPlain(
- BounceMB,
- HKEY( "A message you sent could not be delivered "
- "to some or all of its recipients\ndue to "
- "prolonged unavailability of its destination(s).\n"
- "Giving up on the following addresses:\n\n"),
- 0);
- }
- else if (is_final == SDB_BOUNCE_FATALS) {
- StrBufAppendBufPlain(
- BounceMB,
- HKEY( "A message you sent could not be delivered "
- "to some or all of its recipients.\n"
- "The following addresses were undeliverable:\n\n"),
- 0);
- }
- else if (is_final == SDB_WARN) {
- StrBufAppendBufPlain(
- BounceMB,
- HKEY("A message you sent has not been delivered "
- "to some or all of its recipients.\n"
- "Citadel will continue attempting delivery for five days.\n"
- "The following addresses were undeliverable:\n\n"),
- 0);
- }
- else { // should never get here
- StrBufAppendBufPlain(BounceMB, HKEY("This message should never occur.\n\n"), 0);
- }
-
- /*
- * Now go through the instructions checking for stuff.
- */
- lines = num_tokens(instr, '\n');
- for (i=0; i<lines; ++i) {
- long addrlen;
- long dsnlen;
- extract_token(buf, instr, i, '\n', sizeof buf);
- extract_token(key, buf, 0, '|', sizeof key);
- addrlen = extract_token(addr, buf, 1, '|', sizeof addr);
- status = extract_int(buf, 2);
- dsnlen = extract_token(dsn, buf, 3, '|', sizeof dsn);
- bounce_this = 0;
-
- syslog(LOG_DEBUG, "key=<%s> addr=<%s> status=%d dsn=<%s>", key, addr, status, dsn);
-
- if (!strcasecmp(key, "bounceto")) {
- strcpy(bounceto, addr);
- }
-
- if (!strcasecmp(key, "msgid")) {
- omsgid = atol(addr);
- }
-
- if (!strcasecmp(key, "remote")) {
- if ((is_final == SDB_BOUNCE_FATALS) && (status == 5)) bounce_this = 1;
- if ((is_final == SDB_BOUNCE_ALL) && (status != 2)) bounce_this = 1;
- if ((is_final == SDB_WARN) && (status == 4)) bounce_this = 1;
- }
-
- if (bounce_this) {
- ++num_bounces;
- StrBufAppendBufPlain(BounceMB, addr, addrlen, 0);
- StrBufAppendBufPlain(BounceMB, HKEY(": "), 0);
- StrBufAppendBufPlain(BounceMB, dsn, dsnlen, 0);
- StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
- }
- }
-
- /* Attach the original message */
- if (omsgid >= 0) {
- StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
- StrBufAppendBuf(BounceMB, boundary, 0);
- StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("Content-type: message/rfc822\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("Content-Transfer-Encoding: 7bit\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("Content-Disposition: inline\r\n"), 0);
- StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
-
- CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
- CtdlOutputMsg(omsgid,
- MT_RFC822,
- HEADERS_ALL,
- 0, 1, NULL, 0,
- NULL, NULL, NULL
- );
- StrBufAppendBuf(BounceMB, CC->redirect_buffer, 0);
- FreeStrBuf(&CC->redirect_buffer);
- }
-
- /* Close the multipart MIME scope */
- StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
- StrBufAppendBuf(BounceMB, boundary, 0);
- StrBufAppendBufPlain(BounceMB, HKEY("--\r\n"), 0);
- CM_SetAsFieldSB(bmsg, eMesageText, &BounceMB);
-
- /* Deliver the bounce if there's anything worth mentioning */
- syslog(LOG_DEBUG, "num_bounces = %d", num_bounces);
- if (num_bounces > 0) {
-
- /* First try the user who sent the message */
- if (IsEmptyStr(bounceto)) {
- syslog(LOG_ERR, "No bounce address specified");
- }
- else {
- syslog(LOG_DEBUG, "bounce to user <%s>", bounceto);
- }
- /* Can we deliver the bounce to the original sender? */
- valid = validate_recipients(bounceto, smtp_get_Recipients (), 0);
- if (valid != NULL) {
- if (valid->num_error == 0) {
- CtdlSubmitMsg(bmsg, valid, "");
- successful_bounce = 1;
- }
- }
-
- /* If not, post it in the Aide> room */
- if (successful_bounce == 0) {
- CtdlSubmitMsg(bmsg, NULL, CtdlGetConfigStr("c_aideroom"));
- }
-
- /* Free up the memory we used */
- if (valid != NULL) {
- free_recipients(valid);
- }
- }
- FreeStrBuf(&boundary);
- CM_Free(bmsg);
- syslog(LOG_DEBUG, "Done processing bounces");
-}
-
-
-char *smtpcodes[][2] = {
- { "211 - System status / system help reply" },
- { "214", "Help message" },
- { "220", "Domain service ready" },
- { "221", "Domain service closing transmission channel" },
- { "250", "Requested mail action completed and OK" },
- { "251", "Not Local User, forward email to forward path" },
- { "252", "Cannot Verify user, will attempt delivery later" },
- { "253", "Pending messages for node started" },
- { "354", "Start mail input; end with ." },
- { "355", "Octet-offset is the transaction offset" },
- { "421", "Domain service not available, closing transmission channel" },
- { "432", "Domain service not available, closing transmission channel" },
- { "450", "Requested mail action not taken: mailbox unavailable. request refused" },
- { "451", "Requested action aborted: local error in processing Request is unable to be processed, try again" },
- { "452", "Requested action not taken: insufficient system storage" },
- { "453", "No mail" },
- { "454", "TLS not available due to temporary reason. Encryption required for requested authentication mechanism" },
- { "458", "Unable to queue messages for node" },
- { "459", "Node not allowed: reason" },
- { "500", "Syntax error, command unrecognized" },
- { "501", "Syntax error in parameters or arguments" },
- { "502", "Command not implemented" },
- { "503", "Bad sequence of commands" },
- { "504", "Command parameter not implemented" },
- { "510", "Check the recipient address" },
- { "512", "Domain can not be found. Unknown host." },
- { "515", "Destination mailbox address invalid" },
- { "517", "Problem with senders mail attribute, check properties" },
- { "521", "Domain does not accept mail" },
- { "522", "Recipient has exceeded mailbox limit" },
- { "523", "Server limit exceeded. Message too large" },
- { "530", "Access Denied. Authentication required" },
- { "531", "Mail system Full" },
- { "533", "Remote server has insufficient disk space to hold email" },
- { "534", "Authentication mechanism is too weak. Message too big" },
- { "535", "Multiple servers using same IP. Required Authentication" },
- { "538", "Encryption required for requested authentication mechanism" },
- { "540", "Email address has no DNS Server" },
- { "541", "No response from host" },
- { "542", "Bad Connection" },
- { "543", "Routing server failure. No available route" },
- { "546", "Email looping" },
- { "547", "Delivery time-out" },
- { "550", "Requested action not taken: mailbox unavailable or relaying denied" },
- { "551", "User not local; please try forward path" },
- { "552", "Requested mail action aborted: exceeded storage allocation" },
- { "553", "Requested action not taken: mailbox name not allowed" },
- { "554", "Transaction failed" }
-};
-
-
-char *smtpstatus(int code) {
- int i;
-
- for (i=0; i<(sizeof(smtpcodes)/sizeof(char *)/2); ++i) {
- if (atoi(smtpcodes[i][0]) == code) {
- return(smtpcodes[i][1]);
- }
- }
-
- return("Unknown or other SMTP status");
-}
projects / citadel.git / blobdiff