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-rw-r--r--src/src/moan.c701
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diff --git a/src/src/moan.c b/src/src/moan.c
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+++ b/src/src/moan.c
@@ -0,0 +1,701 @@
+/* $Cambridge: exim/src/src/moan.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
+
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Functions for sending messages to sender or to mailmaster. */
+
+
+#include "exim.h"
+
+
+
+/*************************************************
+* Send error message *
+*************************************************/
+
+/* This function sends an error message by opening a pipe to a new process
+running Exim, and writing a message to it using the "-t" option. This is not
+used for delivery failures, which have their own code for handing failed
+addresses.
+
+Arguments:
+ recipient addressee for the message
+ ident identifies the type of error
+ eblock chain of error_blocks containing data about the error
+ headers the message's headers
+ message_file FILE containing the body of the message
+ firstline contains first line of file, if it was read to check for
+ "From ", but it turned out not to be
+
+Returns: TRUE if message successfully sent
+*/
+
+static BOOL
+moan_send_message(uschar *recipient, int ident, error_block *eblock,
+ header_line *headers, FILE *message_file, uschar *firstline)
+{
+int written = 0;
+int fd;
+int status;
+int count = 0;
+int size_limit = bounce_return_size_limit;
+FILE *f;
+int pid = child_open_exim(&fd);
+
+/* Creation of child failed */
+
+if (pid < 0)
+ {
+ DEBUG(D_any) debug_printf("Failed to create child to send message: %s\n",
+ strerror(errno));
+ return FALSE;
+ }
+else DEBUG(D_any) debug_printf("Child process %d for sending message\n", pid);
+
+/* Creation of child succeeded */
+
+f = fdopen(fd, "wb");
+if (errors_reply_to != NULL) fprintf(f, "Reply-To: %s\n", errors_reply_to);
+fprintf(f, "Auto_submitted: auto-generated\n");
+fprintf(f, "From: Mail Delivery System <Mailer-Daemon@%s>\n",
+ qualify_domain_sender);
+fprintf(f, "To: %s\n", recipient);
+
+switch(ident)
+ {
+ case ERRMESS_BADARGADDRESS:
+ fprintf(f,
+ "Subject: Mail failure - malformed recipient address\n\n");
+ fprintf(f,
+ "A message that you sent contained a recipient address that was incorrectly\n"
+ "constructed:\n\n");
+ fprintf(f, " %s %s\n", eblock->text1, eblock->text2);
+ count = Ustrlen(eblock->text1);
+ if (count > 0 && eblock->text1[count-1] == '.')
+ fprintf(f,
+ "\nRecipient addresses must not end with a '.' character.\n");
+ fprintf(f,
+ "\nThe message has not been delivered to any recipients.\n");
+ break;
+
+ case ERRMESS_BADNOADDRESS:
+ case ERRMESS_BADADDRESS:
+ fprintf(f,
+ "Subject: Mail failure - malformed recipient address\n\n");
+ fprintf(f,
+ "A message that you sent contained one or more recipient addresses that were\n"
+ "incorrectly constructed:\n\n");
+
+ while (eblock != NULL)
+ {
+ fprintf(f, " %s: %s\n", eblock->text1, eblock->text2);
+ count++;
+ eblock = eblock->next;
+ }
+
+ fprintf(f, (count == 1)? "\nThis address has been ignored. " :
+ "\nThese addresses have been ignored. ");
+
+ fprintf(f, (ident == ERRMESS_BADADDRESS)?
+ "The other addresses in the message were\n"
+ "syntactically valid and have been passed on for an attempt at delivery.\n" :
+
+ "There were no other addresses in your\n"
+ "message, and so no attempt at delivery was possible.\n");
+ break;
+
+ case ERRMESS_IGADDRESS:
+ fprintf(f, "Subject: Mail failure - no recipient addresses\n\n");
+ fprintf(f,
+ "A message that you sent using the -t command line option contained no\n"
+ "addresses that were not also on the command line, and were therefore\n"
+ "suppressed. This left no recipient addresses, and so no delivery could\n"
+ "be attempted.\n");
+ break;
+
+ case ERRMESS_NOADDRESS:
+ fprintf(f, "Subject: Mail failure - no recipient addresses\n\n");
+ fprintf(f,
+ "A message that you sent contained no recipient addresses, and therefore no\n"
+ "delivery could be attempted.\n");
+ break;
+
+ case ERRMESS_IOERR:
+ fprintf(f, "Subject: Mail failure - system failure\n\n");
+ fprintf(f,
+ "A system failure was encountered while processing a message that you sent,\n"
+ "so it has not been possible to deliver it. The error was:\n\n%s\n",
+ eblock->text1);
+ break;
+
+ case ERRMESS_VLONGHEADER:
+ fprintf(f, "Subject: Mail failure - overlong header section\n\n");
+ fprintf(f,
+ "A message that you sent contained a header section that was excessively\n"
+ "long and could not be handled by the mail transmission software. The\n"
+ "message has not been delivered to any recipients.\n");
+ break;
+
+ case ERRMESS_VLONGHDRLINE:
+ fprintf(f, "Subject: Mail failure - overlong header line\n\n");
+ fprintf(f,
+ "A message that you sent contained a header line that was excessively\n"
+ "long and could not be handled by the mail transmission software. The\n"
+ "message has not been delivered to any recipients.\n");
+ break;
+
+ case ERRMESS_TOOBIG:
+ fprintf(f, "Subject: Mail failure - message too big\n\n");
+ fprintf(f,
+ "A message that you sent was longer than the maximum size allowed on this\n"
+ "system. It was not delivered to any recipients.\n");
+ break;
+
+ case ERRMESS_TOOMANYRECIP:
+ fprintf(f, "Subject: Mail failure - too many recipients\n\n");
+ fprintf(f,
+ "A message that you sent contained more recipients than allowed on this\n"
+ "system. It was not delivered to any recipients.\n");
+ break;
+
+ case ERRMESS_LOCAL_SCAN:
+ case ERRMESS_LOCAL_ACL:
+ fprintf(f, "Subject: Mail failure - rejected by local scanning code\n\n");
+ fprintf(f,
+ "A message that you sent was rejected by the local scanning code that\n"
+ "checks incoming messages on this system.");
+ if (eblock->text1 != NULL)
+ {
+ fprintf(f,
+ " The following error was given:\n\n %s", eblock->text1);
+ }
+ fprintf(f, "\n");
+ break;
+
+ default:
+ fprintf(f, "Subject: Mail failure\n\n");
+ fprintf(f,
+ "A message that you sent has caused the error routine to be entered with\n"
+ "an unknown error number (%d).\n", ident);
+ break;
+ }
+
+/* Now copy the message - headers then the rest of the input if
+available, up to the configured limit. */
+
+if (size_limit == 0 || size_limit > thismessage_size_limit)
+ size_limit = thismessage_size_limit;
+
+if (size_limit > 0 && size_limit < message_size)
+ {
+ int x = size_limit;
+ uschar *k = US"";
+ if ((x & 1023) == 0)
+ {
+ k = US"K";
+ x >>= 10;
+ }
+ fprintf(f, "\n"
+ "------ This is a copy of your message, including all the headers.\n"
+ "------ No more than %d%s characters of the body are included.\n\n", x, k);
+ }
+else fprintf(f, "\n"
+ "------ This is a copy of your message, including all the headers. ------"
+ "\n\n");
+
+/* If the error occurred before the Received: header was created, its text
+field will still be NULL; just omit such a header line. */
+
+while (headers != NULL)
+ {
+ if (headers->text != NULL) fprintf(f, "%s", CS headers->text);
+ headers = headers->next;
+ }
+
+if (ident != ERRMESS_VLONGHEADER && ident != ERRMESS_VLONGHDRLINE)
+ fputc('\n', f);
+
+/* After early detection of an error, the message file may be STDIN,
+in which case we might have to terminate on a line containing just "."
+as well as on EOF. We may already have the first line in memory. */
+
+if (message_file != NULL)
+ {
+ int ch;
+ int state = 1;
+ BOOL enddot = dot_ends && message_file == stdin;
+ if (firstline != NULL) fprintf(f, "%s", CS firstline);
+ while ((ch = fgetc(message_file)) != EOF)
+ {
+ fputc(ch, f);
+ if (size_limit > 0 && ++written > size_limit) break;
+ if (enddot)
+ {
+ if (state == 0) { if (ch == '\n') state = 1; }
+ else if (state == 1)
+ { if (ch == '.') state = 2; else if (ch != '\n') state = 0; }
+ else
+ { if (ch == '\n') break; else state = 0; }
+ }
+ }
+ }
+
+/* Close the file, which should send an EOF to the child process
+that is receiving the message. Wait for it to finish, without a timeout. */
+
+fclose(f);
+status = child_close(pid, 0); /* Waits for child to close */
+if (status != 0)
+ {
+ uschar *msg = US"Child mail process returned status";
+ if (status == -257)
+ log_write(0, LOG_MAIN, "%s %d: errno=%d: %s", msg, status, errno,
+ strerror(errno));
+ else
+ log_write(0, LOG_MAIN, "%s %d", msg, status);
+ return FALSE;
+ }
+
+return TRUE;
+}
+
+
+
+/*************************************************
+* Send message to sender *
+*************************************************/
+
+/* This function is called when errors are detected during the receipt of a
+message. Delivery failures are handled separately in deliver.c.
+
+If there is a valid sender_address, and the failing message is not a local
+error message, then this function calls moan_send_message to send a message to
+that person. If the sender's address is null, then an error has occurred with a
+message that was generated by a mailer daemon. All we can do is to write
+information to log files. The same action is taken if local_error_message is
+set - this can happen for non null-senders in certain configurations where exim
+doesn't run setuid root.
+
+Arguments:
+ ident identifies the particular error
+ eblock chain of error_blocks containing data about the error
+ headers message's headers (chain)
+ message_file a FILE where the body of the message can be read
+ check_sender if TRUE, read the first line of the file for a possible
+ "From " sender (if a trusted caller)
+
+Returns: FALSE if there is no sender_address to send to;
+ else the return from moan_send_message()
+*/
+
+BOOL
+moan_to_sender(int ident, error_block *eblock, header_line *headers,
+ FILE *message_file, BOOL check_sender)
+{
+uschar *firstline = NULL;
+uschar *msg = US"Error while reading message with no usable sender address";
+
+if (message_reference != NULL)
+ msg = string_sprintf("%s (R=%s)", msg, message_reference);
+
+/* Find the sender from a From line if permitted and possible */
+
+if (check_sender && message_file != NULL && trusted_caller &&
+ Ufgets(big_buffer, BIG_BUFFER_SIZE, message_file) != NULL)
+ {
+ uschar *new_sender = NULL;
+ if (regex_match_and_setup(regex_From, big_buffer, 0, -1))
+ new_sender = expand_string(uucp_from_sender);
+ if (new_sender != NULL) sender_address = new_sender;
+ else firstline = big_buffer;
+ }
+
+/* If viable sender address, send a message */
+
+if (sender_address != NULL && sender_address[0] != 0 && !local_error_message)
+ return moan_send_message(sender_address, ident, eblock, headers,
+ message_file, firstline);
+
+/* Otherwise, we can only log */
+
+switch(ident)
+ {
+ case ERRMESS_BADARGADDRESS:
+ case ERRMESS_BADNOADDRESS:
+ case ERRMESS_BADADDRESS:
+ log_write(0, LOG_MAIN, "%s: at least one malformed recipient address: "
+ "%s - %s", msg, eblock->text1, eblock->text2);
+ break;
+
+ case ERRMESS_IGADDRESS:
+ case ERRMESS_NOADDRESS:
+ log_write(0, LOG_MAIN, "%s: no recipient addresses", msg);
+ break;
+
+ /* This error has already been logged. */
+ case ERRMESS_IOERR:
+ break;
+
+ case ERRMESS_VLONGHEADER:
+ log_write(0, LOG_MAIN, "%s: excessively long message header section read "
+ "(more than %d characters)", msg, header_maxsize);
+ break;
+
+ case ERRMESS_VLONGHDRLINE:
+ log_write(0, LOG_MAIN, "%s: excessively long message header line read "
+ "(more than %d characters)", msg, header_line_maxsize);
+ break;
+
+ case ERRMESS_TOOBIG:
+ log_write(0, LOG_MAIN, "%s: message too big (limit set to %d)", msg,
+ thismessage_size_limit);
+ break;
+
+ case ERRMESS_TOOMANYRECIP:
+ log_write(0, LOG_MAIN, "%s: too many recipients (max set to %d)", msg,
+ recipients_max);
+ break;
+
+ case ERRMESS_LOCAL_SCAN:
+ log_write(0, LOG_MAIN, "%s: rejected by local_scan: %s", msg, eblock->text1);
+ break;
+
+ case ERRMESS_LOCAL_ACL:
+ log_write(0, LOG_MAIN, "%s: rejected by non-SMTP ACL: %s", msg, eblock->text1);
+ break;
+
+ default:
+ log_write(0, LOG_MAIN|LOG_PANIC, "%s: unknown error number %d", msg,
+ ident);
+ break;
+ }
+
+return FALSE;
+}
+
+
+
+/*************************************************
+* Send message to someone *
+*************************************************/
+
+/* This is called when exim is configured to tell someone (often the
+mailmaster) about some incident.
+
+Arguments:
+ who address to send mail to
+ addr chain of deferred addresses whose details are to be included
+ subject subject text for the message
+ format a printf() format for the body of the message
+ ... arguments for the format
+
+Returns: nothing
+*/
+
+void
+moan_tell_someone(uschar *who, address_item *addr, uschar *subject,
+ char *format, ...)
+{
+FILE *f;
+va_list ap;
+int fd;
+int pid = child_open_exim(&fd);
+
+if (pid < 0)
+ {
+ DEBUG(D_any) debug_printf("Failed to create child to send message: %s\n",
+ strerror(errno));
+ return;
+ }
+
+f = fdopen(fd, "wb");
+fprintf(f, "Auto_submitted: auto-generated\n");
+fprintf(f, "From: Mail Delivery System <Mailer-Daemon@%s>\n",
+ qualify_domain_sender);
+fprintf(f, "To: %s\n", who);
+fprintf(f, "Subject: %s\n\n", subject);
+va_start(ap, format);
+vfprintf(f, format, ap);
+va_end(ap);
+
+if (addr != NULL)
+ {
+ fprintf(f, "\nThe following address(es) have yet to be delivered:\n");
+ for (; addr != NULL; addr = addr->next)
+ {
+ uschar *parent = (addr->parent == NULL)? NULL : addr->parent->address;
+ fprintf(f, " %s", addr->address);
+ if (parent != NULL) fprintf(f, " <%s>", parent);
+ if (addr->basic_errno > 0) fprintf(f, ": %s", strerror(addr->basic_errno));
+ if (addr->message != NULL) fprintf(f, ": %s", addr->message);
+ fprintf(f, "\n");
+ }
+ }
+
+fclose(f);
+child_close(pid, 0); /* Waits for child to close; no timeout */
+}
+
+
+
+/*************************************************
+* Handle SMTP batch error *
+*************************************************/
+
+/* This is called when something goes wrong in batched (-bS) SMTP input.
+Information is written to stdout and/or stderr, and Exim exits with a non-zero
+completion code. BSMTP is almost always called by some other program, so it is
+up to that program to interpret the return code and do something with the error
+information, and also to preserve the batch input file for human analysis.
+
+Formerly, Exim used to attempt to continue after some errors, but this strategy
+has been abandoned as it can lead to loss of messages.
+
+Arguments:
+ cmd_buffer the command causing the error, or NULL
+ format a printf() format
+ ... arguments for the format
+
+Returns: does not return; exits from the program
+ exit code = 1 if some messages were accepted
+ exit code = 2 if no messages were accepted
+*/
+
+void
+moan_smtp_batch(uschar *cmd_buffer, char *format, ...)
+{
+va_list ap;
+int yield = (receive_messagecount > 0)? 1 : 2;
+
+DEBUG(D_any) debug_printf("Handling error in batched SMTP input\n");
+
+/* On stdout, write stuff that a program could parse fairly easily. */
+
+va_start(ap, format);
+vfprintf(stdout, format, ap);
+va_end(ap);
+
+fprintf(stdout, "\nTransaction started in line %d\n",
+ bsmtp_transaction_linecount);
+fprintf(stdout, "Error detected in line %d\n", receive_linecount);
+if (cmd_buffer != NULL) fprintf(stdout, "%s\n", cmd_buffer);
+
+/* On stderr, write stuff for human consumption */
+
+fprintf(stderr,
+ "An error was detected while processing a file of BSMTP input.\n"
+ "The error message was:\n\n ");
+
+va_start(ap, format);
+vfprintf(stderr, format, ap);
+va_end(ap);
+
+fprintf(stderr,
+ "\n\nThe SMTP transaction started in line %d.\n"
+ "The error was detected in line %d.\n",
+ bsmtp_transaction_linecount, receive_linecount);
+
+if (cmd_buffer != NULL)
+ {
+ fprintf(stderr, "The SMTP command at fault was:\n\n %s\n\n",
+ cmd_buffer);
+ }
+
+fprintf(stderr, "%d previous message%s successfully processed.\n",
+ receive_messagecount, (receive_messagecount == 1)? " was" : "s were");
+
+fprintf(stderr, "The rest of the batch was abandoned.\n");
+
+exim_exit(yield);
+}
+
+
+
+
+/*************************************************
+* Check for error copies *
+*************************************************/
+
+/* This function is passed the recipient of an error message, and must check
+the error_copies string to see whether there is an additional recipient list to
+which errors for this recipient must be bcc'd. The incoming recipient is always
+fully qualified.
+
+Argument: recipient address
+Returns: additional recipient list or NULL
+*/
+
+uschar *
+moan_check_errorcopy(uschar *recipient)
+{
+uschar *item, *localpart, *domain;
+uschar *listptr = errors_copy;
+uschar *yield = NULL;
+uschar buffer[256];
+int sep = 0;
+int llen;
+
+if (errors_copy == NULL) return NULL;
+
+/* Set up pointer to the local part and domain, and compute the
+length of the local part. */
+
+localpart = recipient;
+domain = Ustrchr(recipient, '@');
+if (domain == NULL) return NULL; /* should not occur, but avoid crash */
+llen = domain++ - recipient;
+
+/* Scan through the configured items */
+
+while ((item = string_nextinlist(&listptr, &sep, buffer, sizeof(buffer)))
+ != NULL)
+ {
+ uschar *newaddress = item;
+ uschar *pattern = string_dequote(&newaddress);
+
+ /* If no new address found, just skip this item. */
+
+ while (isspace(*newaddress)) newaddress++;
+ if (*newaddress == 0) continue;
+
+ /* We now have an item to match as an address in item, and the additional
+ address in newaddress. If the pattern matches, expand the new address string
+ and return it. During expansion, make local part and domain available for
+ insertion. This requires a copy to be made; we can't just temporarily
+ terminate it, as the whole address is required for $0. */
+
+ if (match_address_list(recipient, TRUE, TRUE, &pattern, NULL, 0, UCHAR_MAX+1,
+ NULL) == OK)
+ {
+ uschar temp[256];
+ Ustrncpy(temp, localpart, llen);
+ temp[llen] = 0;
+ deliver_localpart = temp;
+ deliver_domain = domain;
+ yield = expand_string_copy(newaddress);
+ deliver_domain = deliver_localpart = NULL;
+ if (yield == NULL)
+ log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand %s when processing "
+ "errors_copy: %s", newaddress, expand_string_message);
+ break;
+ }
+ }
+
+DEBUG(D_any) debug_printf("errors_copy check returned %s\n",
+ (yield == NULL)? US"NULL" : yield);
+
+expand_nmax = -1;
+return yield;
+}
+
+
+
+/************************************************
+* Handle skipped syntax errors *
+************************************************/
+
+/* This function is called by the redirect router when it has skipped over one
+or more syntax errors in the list of addresses. If there is an address to mail
+to, send a message, and always write the information to the log. In the case of
+a filter file, a "syntax error" might actually be something else, such as the
+inability to open a log file. Thus, the wording of the error message is
+general.
+
+Arguments:
+ rname the router name
+ eblock chain of error blocks
+ syntax_errors_to address to send mail to, or NULL
+ some TRUE if some addresses were generated; FALSE if none were
+ custom custom message text
+
+Returns: FALSE if string expansion failed; TRUE otherwise
+*/
+
+BOOL
+moan_skipped_syntax_errors(uschar *rname, error_block *eblock,
+ uschar *syntax_errors_to, BOOL some, uschar *custom)
+{
+int pid, fd;
+uschar *s, *t;
+FILE *f;
+error_block *e;
+
+for (e = eblock; e != NULL; e = e->next)
+ {
+ if (e->text2 != NULL)
+ log_write(0, LOG_MAIN, "%s router: skipped error: %s in \"%s\"",
+ rname, e->text1, e->text2);
+ else
+ log_write(0, LOG_MAIN, "%s router: skipped error: %s", rname,
+ e->text1);
+ }
+
+if (syntax_errors_to == NULL) return TRUE;
+
+s = expand_string(syntax_errors_to);
+if (s == NULL)
+ {
+ log_write(0, LOG_MAIN, "%s router failed to expand %s: %s", rname,
+ syntax_errors_to, expand_string_message);
+ return FALSE;
+ }
+
+/* If we can't create a process to send the message, just forget about
+it. */
+
+pid = child_open_exim(&fd);
+
+if (pid < 0)
+ {
+ DEBUG(D_any) debug_printf("Failed to create child to send message: %s\n",
+ strerror(errno));
+ return TRUE;
+ }
+
+f = fdopen(fd, "wb");
+fprintf(f, "Auto_submitted: auto-generated\n");
+fprintf(f, "From: Mail Delivery System <Mailer-Daemon@%s>\n",
+ qualify_domain_sender);
+fprintf(f, "To: %s\n", s);
+fprintf(f, "Subject: error(s) in forwarding or filtering\n\n");
+
+if (custom != NULL)
+ {
+ t = expand_string(custom);
+ if (t == NULL)
+ {
+ log_write(0, LOG_MAIN, "%s router failed to expand %s: %s", rname,
+ custom, expand_string_message);
+ return FALSE;
+ }
+ fprintf(f, "%s\n\n", t);
+ }
+
+fprintf(f, "The %s router encountered the following error(s):\n\n",
+ rname);
+
+for (e = eblock; e != NULL; e = e->next)
+ {
+ fprintf(f, " %s", e->text1);
+ if (e->text2 != NULL)
+ fprintf(f, " in the address\n \"%s\"", e->text2);
+ fprintf(f, "\n\n");
+ }
+
+if (some)
+ fprintf(f, "Other addresses were processed normally.\n");
+else
+ fprintf(f, "No valid addresses were generated.\n");
+
+fclose(f);
+child_close(pid, 0); /* Waits for child to close; no timeout */
+
+return TRUE;
+}
+
+/* End of moan.c */
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