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-rw-r--r--src/cleanup/cleanup_out.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/src/cleanup/cleanup_out.c b/src/cleanup/cleanup_out.c
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+/*++
+/* NAME
+/* cleanup_out 3
+/* SUMMARY
+/* record output support
+/* SYNOPSIS
+/* #include "cleanup.h"
+/*
+/* int CLEANUP_OUT_OK(state)
+/* CLEANUP_STATE *state;
+/*
+/* void cleanup_out(state, type, data, len)
+/* CLEANUP_STATE *state;
+/* int type;
+/* const char *data;
+/* ssize_t len;
+/*
+/* void cleanup_out_string(state, type, str)
+/* CLEANUP_STATE *state;
+/* int type;
+/* const char *str;
+/*
+/* void CLEANUP_OUT_BUF(state, type, buf)
+/* CLEANUP_STATE *state;
+/* int type;
+/* VSTRING *buf;
+/*
+/* void cleanup_out_format(state, type, format, ...)
+/* CLEANUP_STATE *state;
+/* int type;
+/* const char *format;
+/*
+/* void cleanup_out_header(state, buf)
+/* CLEANUP_STATE *state;
+/* VSTRING *buf;
+/* DESCRIPTION
+/* This module writes records to the output stream.
+/*
+/* CLEANUP_OUT_OK() is a macro that evaluates to non-zero
+/* as long as it makes sense to produce output. All output
+/* routines below check for this condition.
+/*
+/* cleanup_out() is the main record output routine. It writes
+/* one record of the specified type, with the specified data
+/* and length to the output stream.
+/*
+/* cleanup_out_string() outputs one string as a record.
+/*
+/* CLEANUP_OUT_BUF() is an unsafe macro that outputs
+/* one string buffer as a record.
+/*
+/* cleanup_out_format() formats its arguments and writes
+/* the result as a record.
+/*
+/* cleanup_out_header() outputs a multi-line header as records
+/* of the specified type. The input is expected to be newline
+/* separated (not newline terminated), and is modified.
+/* 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <errno.h>
+#include <stdlib.h> /* 44BSD stdarg.h uses abort() */
+#include <stdarg.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <split_at.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <record.h>
+#include <rec_type.h>
+#include <cleanup_user.h>
+#include <mail_params.h>
+#include <lex_822.h>
+#include <smtputf8.h>
+
+/* Application-specific. */
+
+#include "cleanup.h"
+
+#define STR vstring_str
+
+/* cleanup_out - output one single record */
+
+void cleanup_out(CLEANUP_STATE *state, int type, const char *string, ssize_t len)
+{
+ int err = 0;
+
+ /*
+ * Long message header lines have to be read and written as multiple
+ * records. Other header/body content, and envelope data, is copied one
+ * record at a time. Be sure to not skip a zero-length request.
+ *
+ * XXX We don't know if we're writing a message header or not, but that is
+ * not a problem. A REC_TYPE_NORM or REC_TYPE_CONT record can always be
+ * chopped up into an equivalent set of REC_TYPE_CONT plus REC_TYPE_NORM
+ * records.
+ */
+ if (CLEANUP_OUT_OK(state) == 0)
+ return;
+
+#define TEXT_RECORD(t) ((t) == REC_TYPE_NORM || (t) == REC_TYPE_CONT)
+
+ if (var_line_limit <= 0)
+ msg_panic("cleanup_out: bad line length limit: %d", var_line_limit);
+ do {
+ if (len > var_line_limit && TEXT_RECORD(type)) {
+ err = rec_put(state->dst, REC_TYPE_CONT, string, var_line_limit);
+ string += var_line_limit;
+ len -= var_line_limit;
+ } else {
+ err = rec_put(state->dst, type, string, len);
+ break;
+ }
+ } while (len > 0 && err >= 0);
+
+ if (err < 0) {
+ if (errno == EFBIG) {
+ msg_warn("%s: queue file size limit exceeded",
+ state->queue_id);
+ state->errs |= CLEANUP_STAT_SIZE;
+ } else {
+ msg_warn("%s: write queue file: %m", state->queue_id);
+ state->errs |= CLEANUP_STAT_WRITE;
+ }
+ }
+}
+
+/* cleanup_out_string - output string to one single record */
+
+void cleanup_out_string(CLEANUP_STATE *state, int type, const char *string)
+{
+ cleanup_out(state, type, string, strlen(string));
+}
+
+/* cleanup_out_format - output one formatted record */
+
+void cleanup_out_format(CLEANUP_STATE *state, int type, const char *fmt,...)
+{
+ static VSTRING *vp;
+ va_list ap;
+
+ if (vp == 0)
+ vp = vstring_alloc(100);
+ va_start(ap, fmt);
+ vstring_vsprintf(vp, fmt, ap);
+ va_end(ap);
+ CLEANUP_OUT_BUF(state, type, vp);
+}
+
+/* cleanup_out_header - output one multi-line header as a bunch of records */
+
+void cleanup_out_header(CLEANUP_STATE *state, VSTRING *header_buf)
+{
+ char *start = vstring_str(header_buf);
+ char *line;
+ char *next_line;
+ ssize_t line_len;
+
+ /*
+ * Fix 20140711: Auto-detect the presence of a non-ASCII header.
+ */
+ if (var_smtputf8_enable && *STR(header_buf) && !allascii(STR(header_buf))) {
+ state->smtputf8 |= SMTPUTF8_FLAG_HEADER;
+ /* Fix 20140713: request SMTPUTF8 support selectively. */
+ if (state->flags & CLEANUP_FLAG_AUTOUTF8)
+ state->smtputf8 |= SMTPUTF8_FLAG_REQUESTED;
+ }
+
+ /*
+ * Prepend a tab to continued header lines that went through the address
+ * rewriting machinery. See cleanup_fold_header(state) below for the form
+ * of such header lines. NB: This code destroys the header. We could try
+ * to avoid clobbering it, but we're not going to use the data any
+ * further.
+ *
+ * XXX We prefer to truncate a header at the last line boundary before the
+ * header size limit. If this would undershoot the limit by more than
+ * 10%, we truncate between line boundaries to avoid losing too much
+ * text. This "unkind cut" may result in syntax errors and may trigger
+ * warnings from down-stream MTAs.
+ *
+ * If Milter is enabled, pad a short header record with a dummy record so
+ * that a header record can safely be overwritten by a pointer record.
+ * This simplifies header modification enormously.
+ */
+ for (line = start; line; line = next_line) {
+ next_line = split_at(line, '\n');
+ line_len = next_line ? next_line - 1 - line : strlen(line);
+ if (line + line_len > start + var_header_limit) {
+ if (line - start > 0.9 * var_header_limit) /* nice cut */
+ break;
+ start[var_header_limit] = 0; /* unkind cut */
+ next_line = 0;
+ }
+ if (line == start) {
+ cleanup_out_string(state, REC_TYPE_NORM, line);
+ if ((state->milters || cleanup_milters)
+ && line_len < REC_TYPE_PTR_PAYL_SIZE)
+ rec_pad(state->dst, REC_TYPE_DTXT,
+ REC_TYPE_PTR_PAYL_SIZE - line_len);
+ } else if (IS_SPACE_TAB(*line)) {
+ cleanup_out_string(state, REC_TYPE_NORM, line);
+ } else {
+ cleanup_out_format(state, REC_TYPE_NORM, "\t%s", line);
+ }
+ }
+}