X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/f1e894f37fb99398f7447220925a915bd031491a..9bfb7e1bec2b3b6022c2e7b42df9ac606693dcfd:/src/src/moan.c diff --git a/src/src/moan.c b/src/src/moan.c index acf701aec..90deefc56 100644 --- a/src/src/moan.c +++ b/src/src/moan.c @@ -1,10 +1,8 @@ -/* $Cambridge: exim/src/src/moan.c,v 1.3 2005/06/27 14:29:43 ph10 Exp $ */ - /************************************************* * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) University of Cambridge 1995 - 2005 */ +/* Copyright (c) University of Cambridge 1995 - 2016 */ /* See the file NOTICE for conditions of use and distribution. */ /* Functions for sending messages to sender or to mailmaster. */ @@ -14,6 +12,34 @@ +/************************************************* +* Write From: line for DSN * +*************************************************/ + +/* This function is called to write the From: line in automatically generated +messages - bounces, warnings, etc. It expands a configuration item in order to +get the text. If the expansion fails, a panic is logged and the default value +for the option is used. + +Argument: the FILE to write to +Returns: nothing +*/ + +void +moan_write_from(FILE *f) +{ +uschar *s = expand_string(dsn_from); +if (s == NULL) + { + log_write(0, LOG_MAIN|LOG_PANIC, + "Failed to expand dsn_from (using default): %s", expand_string_message); + s = expand_string(US DEFAULT_DSN_FROM); + } +fprintf(f, "From: %s\n", s); +} + + + /************************************************* * Send error message * *************************************************/ @@ -60,191 +86,242 @@ 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 \n", - qualify_domain_sender); +if (errors_reply_to) fprintf(f, "Reply-To: %s\n", errors_reply_to); +fprintf(f, "Auto-Submitted: auto-replied\n"); +moan_write_from(f); 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; + "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"); + 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; - } + 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, (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" : + 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; + "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; + 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; + 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; + 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; + 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; + 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; + 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; + 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, "Subject: Mail failure - rejected by local scanning code\n\n"); fprintf(f, - " The following error was given:\n\n %s", eblock->text1); - } + "A message that you sent was rejected by the local scanning code that\n" + "checks incoming messages on this system."); + if (eblock->text1) + 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); +#ifdef EXPERIMENTAL_DMARC + case ERRMESS_DMARC_FORENSIC: + bounce_return_message = TRUE; + bounce_return_body = FALSE; + fprintf(f, + "Subject: DMARC Forensic Report for %s from IP %s\n\n", + ((eblock == NULL) ? US"Unknown" : eblock->text2), + sender_host_address); + fprintf(f, + "A message claiming to be from you has failed the published DMARC\n" + "policy for your domain.\n\n"); + while (eblock != NULL) + { + fprintf(f, " %s: %s\n", eblock->text1, eblock->text2); + count++; + eblock = eblock->next; + } break; - } +#endif -/* Now copy the message - headers then the rest of the input if -available, up to the configured limit. */ + 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; + } -if (size_limit == 0 || size_limit > thismessage_size_limit) - size_limit = thismessage_size_limit; +/* Now, if configured, copy the message; first the headers and then the rest of +the input if available, up to the configured limit, if the option for including +message bodies in bounces is set. */ -if (size_limit > 0 && size_limit < message_size) +if (bounce_return_message) { - int x = size_limit; - uschar *k = US""; - if ((x & 1023) == 0) + if (bounce_return_body) + { + fprintf(f, "\n" + "------ This is a copy of your message, including all the headers."); + 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" + "------ No more than %d%s characters of the body are included.\n\n", + x, k); + } + else fprintf(f, " ------\n\n"); + } + else { - k = US"K"; - x >>= 10; + fprintf(f, "\n" + "------ This is a copy of the headers that were received before the " + "error\n was detected.\n\n"); } - 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. */ + /* 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; - } + while (headers) + { + if (headers->text != NULL) fprintf(f, "%s", CS headers->text); + headers = headers->next; + } -if (ident != ERRMESS_VLONGHEADER && ident != ERRMESS_VLONGHDRLINE) - fputc('\n', f); + 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. */ + /* 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) + if (bounce_return_body && message_file) { - fputc(ch, f); - if (size_limit > 0 && ++written > size_limit) break; - if (enddot) + BOOL enddot = dot_ends && message_file == stdin; + uschar * buf = store_get(bounce_return_linesize_limit+2); + + if (firstline) fprintf(f, "%s", CS firstline); + + while (fgets(CS buf, bounce_return_linesize_limit+2, message_file)) { - 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; } + int len; + + if (enddot && *buf == '.' && buf[1] == '\n') + { + fputc('.', f); + break; + } + + len = Ustrlen(buf); + if (buf[len-1] != '\n') + { /* eat rest of partial line */ + int ch; + while ((ch = fgetc(message_file)) != EOF && ch != '\n') ; + } + + if (size_limit > 0 && len > size_limit - written) + { + buf[size_limit - written] = '\0'; + fputs(CS buf, f); + break; + } + + fputs(CS buf, f); } } +#ifdef EXPERIMENTAL_DMARC + /* Overkill, but use exact test in case future code gets inserted */ + else if (bounce_return_body && message_file == NULL) + { + /*XXX limit line length here? */ + /* This doesn't print newlines, disable until can parse and fix + * output to be legible. */ + fprintf(f, "%s", expand_string(US"$message_body")); + } +#endif } - /* 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. */ @@ -300,24 +377,24 @@ moan_to_sender(int ident, error_block *eblock, header_line *headers, uschar *firstline = NULL; uschar *msg = US"Error while reading message with no usable sender address"; -if (message_reference != NULL) +if (message_reference) 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 && +if (check_sender && message_file && 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; + if (new_sender) 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) +if (sender_address && sender_address[0] && !local_error_message) return moan_send_message(sender_address, ident, eblock, headers, message_file, firstline); @@ -398,8 +475,8 @@ Returns: nothing */ void -moan_tell_someone(uschar *who, address_item *addr, uschar *subject, - char *format, ...) +moan_tell_someone(uschar *who, address_item *addr, + const uschar *subject, const char *format, ...) { FILE *f; va_list ap; @@ -414,9 +491,8 @@ if (pid < 0) } f = fdopen(fd, "wb"); -fprintf(f, "Auto_submitted: auto-generated\n"); -fprintf(f, "From: Mail Delivery System \n", - qualify_domain_sender); +fprintf(f, "Auto-Submitted: auto-replied\n"); +moan_write_from(f); fprintf(f, "To: %s\n", who); fprintf(f, "Subject: %s\n\n", subject); va_start(ap, format); @@ -467,7 +543,7 @@ Returns: does not return; exits from the program */ void -moan_smtp_batch(uschar *cmd_buffer, char *format, ...) +moan_smtp_batch(uschar *cmd_buffer, const char *format, ...) { va_list ap; int yield = (receive_messagecount > 0)? 1 : 2; @@ -511,7 +587,7 @@ fprintf(stderr, "%d previous message%s successfully processed.\n", fprintf(stderr, "The rest of the batch was abandoned.\n"); -exim_exit(yield); +exim_exit(yield, US"batch"); } @@ -534,7 +610,7 @@ uschar * moan_check_errorcopy(uschar *recipient) { uschar *item, *localpart, *domain; -uschar *listptr = errors_copy; +const uschar *listptr = errors_copy; uschar *yield = NULL; uschar buffer[256]; int sep = 0; @@ -546,7 +622,7 @@ if (errors_copy == NULL) return NULL; length of the local part. */ localpart = recipient; -domain = Ustrchr(recipient, '@'); +domain = Ustrrchr(recipient, '@'); if (domain == NULL) return NULL; /* should not occur, but avoid crash */ llen = domain++ - recipient; @@ -555,8 +631,8 @@ llen = domain++ - recipient; while ((item = string_nextinlist(&listptr, &sep, buffer, sizeof(buffer))) != NULL) { - uschar *newaddress = item; - uschar *pattern = string_dequote(&newaddress); + const uschar *newaddress = item; + const uschar *pattern = string_dequote(&newaddress); /* If no new address found, just skip this item. */ @@ -572,10 +648,7 @@ while ((item = string_nextinlist(&listptr, &sep, buffer, sizeof(buffer))) 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_localpart = string_copyn(localpart, llen); deliver_domain = domain; yield = expand_string_copy(newaddress); deliver_domain = deliver_localpart = NULL; @@ -658,9 +731,8 @@ if (pid < 0) } f = fdopen(fd, "wb"); -fprintf(f, "Auto_submitted: auto-generated\n"); -fprintf(f, "From: Mail Delivery System \n", - qualify_domain_sender); +fprintf(f, "Auto-Submitted: auto-replied\n"); +moan_write_from(f); fprintf(f, "To: %s\n", s); fprintf(f, "Subject: error(s) in forwarding or filtering\n\n");