Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 315 insertions, 0 deletions

diff --git a/src/global/mail_copy.c b/src/global/mail_copy.c
new file mode 100644
index 0000000..8a56f84
--- /dev/null
+++ b/src/global/mail_copy.c
@@ -0,0 +1,315 @@
+/*++
+/* NAME
+/*	mail_copy 3
+/* SUMMARY
+/*	copy message with extreme prejudice
+/* SYNOPSIS
+/*	#include <mail_copy.h>
+/*
+/*	int	mail_copy(sender, orig_to, delivered, src, dst, flags, eol, why)
+/*	const char *sender;
+/*	const char *orig_to;
+/*	const char *delivered;
+/*	VSTREAM	*src;
+/*	VSTREAM	*dst;
+/*	int	flags;
+/*	const char *eol;
+/*	DSN_BUF	*why;
+/* DESCRIPTION
+/*	mail_copy() copies a mail message from record stream to stream-lf
+/*	stream, and attempts to detect all possible I/O errors.
+/*
+/*	Arguments:
+/* .IP sender
+/*	The sender envelope address.
+/* .IP delivered
+/*	Null pointer or delivered-to: header address.
+/* .IP src
+/*	The source record stream, positioned at the beginning of the
+/*	message contents.
+/* .IP dst
+/*	The destination byte stream (in stream-lf format). If the message
+/*	ends in an incomplete line, a newline character is appended to
+/*	the output.
+/* .IP flags
+/*	The binary OR of zero or more of the following:
+/* .RS
+/* .IP MAIL_COPY_QUOTE
+/*	Prepend a `>' character to lines beginning with `From '.
+/* .IP MAIL_COPY_DOT
+/*	Prepend a `.' character to lines beginning with `.'.
+/* .IP MAIL_COPY_TOFILE
+/*	On systems that support this, use fsync() to flush the
+/*	data to stable storage, and truncate the destination
+/*	file to its original length in case of problems.
+/* .IP MAIL_COPY_FROM
+/*	Prepend a UNIX-style From_ line to the message.
+/* .IP MAIL_COPY_BLANK
+/*	Append an empty line to the end of the message.
+/* .IP MAIL_COPY_DELIVERED
+/*	Prepend a Delivered-To: header with the name of the
+/*	\fIdelivered\fR attribute.
+/*	The address is quoted according to RFC822 rules.
+/* .IP MAIL_COPY_ORIG_RCPT
+/*	Prepend an X-Original-To: header with the original
+/*	envelope recipient address. This is a NOOP with
+/*	var_enable_orcpt === 0.
+/* .IP MAIL_COPY_RETURN_PATH
+/*	Prepend a Return-Path: header with the value of the
+/*	\fIsender\fR attribute.
+/* .RE
+/*	The manifest constant MAIL_COPY_MBOX is a convenient shorthand for
+/*	all MAIL_COPY_XXX options that are appropriate for mailbox delivery.
+/*	Use MAIL_COPY_NONE to copy a message without any options enabled.
+/* .IP eol
+/*	Record delimiter, for example, LF or CF LF.
+/* .IP why
+/*	A null pointer, or storage for the reason of failure in
+/*	the form of a DSN detail code plus free text.
+/* DIAGNOSTICS
+/*	A non-zero result means the operation failed. Warnings: corrupt
+/*	message file. A corrupt message is marked as corrupt.
+/*
+/*	The result is the bit-wise OR of zero or more of the following:
+/* .IP MAIL_COPY_STAT_CORRUPT
+/*	The queue file is marked as corrupt.
+/* .IP MAIL_COPY_STAT_READ
+/*	A read error was detected; errno specifies the nature of the problem.
+/* .IP MAIL_COPY_STAT_WRITE
+/*	A write error was detected; errno specifies the nature of the problem.
+/* SEE ALSO
+/*	mark_corrupt(3), mark queue file as corrupted.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <htable.h>
+#include <vstream.h>
+#include <vstring.h>
+#include <vstring_vstream.h>
+#include <stringops.h>
+#include <iostuff.h>
+#include <warn_stat.h>
+
+/* Global library. */
+
+#include "quote_822_local.h"
+#include "record.h"
+#include "rec_type.h"
+#include "mail_queue.h"
+#include "mail_addr.h"
+#include "mark_corrupt.h"
+#include "mail_params.h"
+#include "mail_copy.h"
+#include "mbox_open.h"
+#include "dsn_buf.h"
+#include "sys_exits.h"
+
+/* mail_copy - copy message with extreme prejudice */
+
+int     mail_copy(const char *sender,
+		          const char *orig_rcpt,
+		          const char *delivered,
+		          VSTREAM *src, VSTREAM *dst,
+		          int flags, const char *eol, DSN_BUF *why)
+{
+    const char *myname = "mail_copy";
+    VSTRING *buf;
+    char   *bp;
+    off_t   orig_length;
+    int     read_error;
+    int     write_error;
+    int     corrupt_error = 0;
+    time_t  now;
+    int     type;
+    int     prev_type;
+    struct stat st;
+    off_t   size_limit;
+
+    /*
+     * Workaround 20090114. This will hopefully get someone's attention. The
+     * problem with file_size_limit < message_size_limit is that mail will be
+     * delivered again and again until someone removes it from the queue by
+     * hand, because Postfix cannot mark a recipient record as "completed".
+     */
+    if (fstat(vstream_fileno(src), &st) < 0)
+	msg_fatal("fstat: %m");
+    if ((size_limit = get_file_limit()) < st.st_size)
+	msg_panic("file size limit %lu < message size %lu. This "
+		  "causes large messages to be delivered repeatedly "
+		  "after they were submitted with \"sendmail -t\" "
+		  "or after recipients were added with the Milter "
+		  "SMFIR_ADDRCPT request",
+		  (unsigned long) size_limit,
+		  (unsigned long) st.st_size);
+
+    /*
+     * Initialize.
+     */
+#ifndef NO_TRUNCATE
+    if ((flags & MAIL_COPY_TOFILE) != 0)
+	if ((orig_length = vstream_fseek(dst, (off_t) 0, SEEK_END)) < 0)
+	    msg_fatal("seek file %s: %m", VSTREAM_PATH(dst));
+#endif
+    buf = vstring_alloc(100);
+
+    /*
+     * Prepend a bunch of headers to the message.
+     */
+    if (flags & (MAIL_COPY_FROM | MAIL_COPY_RETURN_PATH)) {
+	if (sender == 0)
+	    msg_panic("%s: null sender", myname);
+	quote_822_local(buf, sender);
+	if (flags & MAIL_COPY_FROM) {
+	    time(&now);
+	    vstream_fprintf(dst, "From %s  %.24s%s", *sender == 0 ?
+			    MAIL_ADDR_MAIL_DAEMON : vstring_str(buf),
+			    asctime(localtime(&now)), eol);
+	}
+	if (flags & MAIL_COPY_RETURN_PATH) {
+	    vstream_fprintf(dst, "Return-Path: <%s>%s",
+			    *sender ? vstring_str(buf) : "", eol);
+	}
+    }
+    if (flags & MAIL_COPY_ORIG_RCPT) {
+	if (orig_rcpt == 0)
+	    msg_panic("%s: null orig_rcpt", myname);
+
+	/*
+	 * An empty original recipient record almost certainly means that
+	 * original recipient processing was disabled.
+	 */
+	if (var_enable_orcpt && *orig_rcpt) {
+	    quote_822_local(buf, orig_rcpt);
+	    vstream_fprintf(dst, "X-Original-To: %s%s", vstring_str(buf), eol);
+	}
+    }
+    if (flags & MAIL_COPY_DELIVERED) {
+	if (delivered == 0)
+	    msg_panic("%s: null delivered", myname);
+	quote_822_local(buf, delivered);
+	vstream_fprintf(dst, "Delivered-To: %s%s", vstring_str(buf), eol);
+    }
+
+    /*
+     * Copy the message. Escape lines that could be confused with the ugly
+     * From_ line. Make sure that there is a blank line at the end of the
+     * message so that the next ugly From_ can be found by mail reading
+     * software.
+     * 
+     * XXX Rely on the front-end services to enforce record size limits.
+     */
+#define VSTREAM_FWRITE_BUF(s,b) \
+	vstream_fwrite((s),vstring_str(b),VSTRING_LEN(b))
+
+    prev_type = REC_TYPE_NORM;
+    while ((type = rec_get(src, buf, 0)) > 0) {
+	if (type != REC_TYPE_NORM && type != REC_TYPE_CONT)
+	    break;
+	bp = vstring_str(buf);
+	if (prev_type == REC_TYPE_NORM) {
+	    if ((flags & MAIL_COPY_QUOTE) && *bp == 'F' && !strncmp(bp, "From ", 5))
+		VSTREAM_PUTC('>', dst);
+	    if ((flags & MAIL_COPY_DOT) && *bp == '.')
+		VSTREAM_PUTC('.', dst);
+	}
+	if (VSTRING_LEN(buf) && VSTREAM_FWRITE_BUF(dst, buf) != VSTRING_LEN(buf))
+	    break;
+	if (type == REC_TYPE_NORM && vstream_fputs(eol, dst) == VSTREAM_EOF)
+	    break;
+	prev_type = type;
+    }
+    if (vstream_ferror(dst) == 0) {
+	if (var_fault_inj_code == 1)
+	    type = 0;
+	if (type != REC_TYPE_XTRA) {
+	    /* XXX Where is the queue ID? */
+	    msg_warn("bad record type: %d in message content", type);
+	    corrupt_error = mark_corrupt(src);
+	}
+	if (prev_type != REC_TYPE_NORM)
+	    vstream_fputs(eol, dst);
+	if (flags & MAIL_COPY_BLANK)
+	    vstream_fputs(eol, dst);
+    }
+    vstring_free(buf);
+
+    /*
+     * Make sure we read and wrote all. Truncate the file to its original
+     * length when the delivery failed. POSIX does not require ftruncate(),
+     * so we may have a portability problem. Note that fclose() may fail even
+     * while fflush and fsync() succeed. Think of remote file systems such as
+     * AFS that copy the file back to the server upon close. Oh well, no
+     * point optimizing the error case. XXX On systems that use flock()
+     * locking, we must truncate the file file before closing it (and losing
+     * the exclusive lock).
+     */
+    read_error = vstream_ferror(src);
+    write_error = vstream_fflush(dst);
+#ifdef HAS_FSYNC
+    if ((flags & MAIL_COPY_TOFILE) != 0)
+	write_error |= fsync(vstream_fileno(dst));
+#endif
+    if (var_fault_inj_code == 2) {
+	read_error = 1;
+	errno = ENOENT;
+    }
+    if (var_fault_inj_code == 3) {
+	write_error = 1;
+	errno = ENOENT;
+    }
+#ifndef NO_TRUNCATE
+    if ((flags & MAIL_COPY_TOFILE) != 0)
+	if (corrupt_error || read_error || write_error)
+	    /* Complain about ignored "undo" errors? So sue me. */
+	    (void) ftruncate(vstream_fileno(dst), orig_length);
+#endif
+    write_error |= vstream_fclose(dst);
+
+    /*
+     * Return the optional verbose error description.
+     */
+#define TRY_AGAIN_ERROR(errno) \
+	(errno == EAGAIN || errno == ESTALE)
+
+    if (why && read_error)
+	dsb_unix(why, TRY_AGAIN_ERROR(errno) ? "4.3.0" : "5.3.0",
+		 sys_exits_detail(EX_IOERR)->text,
+		 "error reading message: %m");
+    if (why && write_error)
+	dsb_unix(why, mbox_dsn(errno, "5.3.0"),
+		 sys_exits_detail(EX_IOERR)->text,
+		 "error writing message: %m");
+
+    /*
+     * Use flag+errno description when the optional verbose description is
+     * not desired.
+     */
+    return ((corrupt_error ? MAIL_COPY_STAT_CORRUPT : 0)
+	    | (read_error ? MAIL_COPY_STAT_READ : 0)
+	    | (write_error ? MAIL_COPY_STAT_WRITE : 0));
+}