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-rw-r--r--src/cleanup/cleanup_body_edit.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/src/cleanup/cleanup_body_edit.c b/src/cleanup/cleanup_body_edit.c
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+++ b/src/cleanup/cleanup_body_edit.c
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+/*++
+/* NAME
+/* cleanup_body_edit 3
+/* SUMMARY
+/* edit body content
+/* SYNOPSIS
+/* #include "cleanup.h"
+/*
+/* int cleanup_body_edit_start(state)
+/* CLEANUP_STATE *state;
+/*
+/* int cleanup_body_edit_write(state, type, buf)
+/* CLEANUP_STATE *state;
+/* int type;
+/* VSTRING *buf;
+/*
+/* int cleanup_body_edit_finish(state)
+/* CLEANUP_STATE *state;
+/*
+/* void cleanup_body_edit_free(state)
+/* CLEANUP_STATE *state;
+/* DESCRIPTION
+/* This module maintains queue file regions with body content.
+/* Regions are created on the fly, and can be reused multiple
+/* times. This module must not be called until the queue file
+/* is complete, and there must be no other read/write access
+/* to the queue file between the cleanup_body_edit_start() and
+/* cleanup_body_edit_finish() calls.
+/*
+/* cleanup_body_edit_start() performs initialization and sets
+/* the queue file write pointer to the start of the first body
+/* region.
+/*
+/* cleanup_body_edit_write() adds a queue file record to the
+/* queue file. When the current body region fills up, some
+/* unused region is reused, or a new region is created.
+/*
+/* cleanup_body_edit_finish() makes some final adjustments
+/* after the last body content record is written.
+/*
+/* cleanup_body_edit_free() frees up memory that was allocated
+/* by cleanup_body_edit_start() and cleanup_body_edit_write().
+/*
+/* Arguments:
+/* .IP state
+/* Queue file and message processing state. This state is updated
+/* as records are processed and as errors happen.
+/* .IP type
+/* Record type.
+/* .IP buf
+/* Record content.
+/* 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>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstream.h>
+#include <vstring.h>
+
+/* Global library. */
+
+#include <rec_type.h>
+#include <record.h>
+
+/* Application-specific. */
+
+#include <cleanup.h>
+
+#define LEN(s) VSTRING_LEN(s)
+
+static int cleanup_body_edit_ptr_rec_len;
+
+/* cleanup_body_edit_start - rewrite body region pool */
+
+int cleanup_body_edit_start(CLEANUP_STATE *state)
+{
+ const char *myname = "cleanup_body_edit_start";
+ CLEANUP_REGION *curr_rp;
+
+ /*
+ * Calculate the payload size sans body.
+ */
+ state->cont_length = state->body_offset - state->data_offset;
+
+ /*
+ * One-time initialization.
+ */
+ if (state->body_regions == 0) {
+ REC_SPACE_NEED(REC_TYPE_PTR_PAYL_SIZE, cleanup_body_edit_ptr_rec_len);
+ cleanup_region_init(state);
+ }
+
+ /*
+ * Return all body regions to the free pool.
+ */
+ cleanup_region_return(state, state->body_regions);
+
+ /*
+ * Select the first region. XXX This will usually be the original body
+ * segment, but we must not count on that. Region assignments may change
+ * when header editing also uses queue file regions. XXX We don't really
+ * know if the first region will be large enough to hold the first body
+ * text record, but this problem is so rare that we will not complicate
+ * the code for it. If the first region is too small then we will simply
+ * waste it.
+ */
+ curr_rp = state->curr_body_region = state->body_regions =
+ cleanup_region_open(state, cleanup_body_edit_ptr_rec_len);
+
+ /*
+ * Link the first body region to the last message header.
+ */
+ if (vstream_fseek(state->dst, state->append_hdr_pt_offset, SEEK_SET) < 0) {
+ msg_warn("%s: seek file %s: %m", myname, cleanup_path);
+ return (-1);
+ }
+ state->append_hdr_pt_target = curr_rp->start;
+ rec_fprintf(state->dst, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
+ (long) state->append_hdr_pt_target);
+
+ /*
+ * Move the file write pointer to the start of the current region.
+ */
+ if (vstream_ftell(state->dst) != curr_rp->start
+ && vstream_fseek(state->dst, curr_rp->start, SEEK_SET) < 0) {
+ msg_warn("%s: seek file %s: %m", myname, cleanup_path);
+ return (-1);
+ }
+ return (0);
+}
+
+/* cleanup_body_edit_write - add record to body region pool */
+
+int cleanup_body_edit_write(CLEANUP_STATE *state, int rec_type,
+ VSTRING *buf)
+{
+ const char *myname = "cleanup_body_edit_write";
+ CLEANUP_REGION *curr_rp = state->curr_body_region;
+ CLEANUP_REGION *next_rp;
+ off_t space_used;
+ ssize_t space_needed;
+ ssize_t rec_len;
+
+ if (msg_verbose)
+ msg_info("%s: where %ld, buflen %ld region start %ld len %ld",
+ myname, (long) curr_rp->write_offs, (long) LEN(buf),
+ (long) curr_rp->start, (long) curr_rp->len);
+
+ /*
+ * Switch to the next body region if we filled up the current one (we
+ * always append to an open-ended region). Besides space to write the
+ * specified record, we need to leave space for a final pointer record
+ * that will link this body region to the next region or to the content
+ * terminator record.
+ */
+ if (curr_rp->len > 0) {
+ space_used = curr_rp->write_offs - curr_rp->start;
+ REC_SPACE_NEED(LEN(buf), rec_len);
+ space_needed = rec_len + cleanup_body_edit_ptr_rec_len;
+ if (space_needed > curr_rp->len - space_used) {
+
+ /*
+ * Update the payload size. Connect the filled up body region to
+ * its successor.
+ */
+ state->cont_length += space_used;
+ next_rp = cleanup_region_open(state, space_needed);
+ if (msg_verbose)
+ msg_info("%s: link %ld -> %ld", myname,
+ (long) curr_rp->write_offs, (long) next_rp->start);
+ rec_fprintf(state->dst, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
+ (long) next_rp->start);
+ curr_rp->write_offs = vstream_ftell(state->dst);
+ cleanup_region_close(state, curr_rp);
+ curr_rp->next = next_rp;
+
+ /*
+ * Select the new body region.
+ */
+ state->curr_body_region = curr_rp = next_rp;
+ if (vstream_fseek(state->dst, curr_rp->start, SEEK_SET) < 0) {
+ msg_warn("%s: seek file %s: %m", myname, cleanup_path);
+ return (-1);
+ }
+ }
+ }
+
+ /*
+ * Finally, output the queue file record.
+ */
+ CLEANUP_OUT_BUF(state, rec_type, buf);
+ curr_rp->write_offs = vstream_ftell(state->dst);
+
+ return (0);
+}
+
+/* cleanup_body_edit_finish - wrap up body region pool */
+
+int cleanup_body_edit_finish(CLEANUP_STATE *state)
+{
+ CLEANUP_REGION *curr_rp = state->curr_body_region;
+
+ /*
+ * Update the payload size.
+ */
+ state->cont_length += curr_rp->write_offs - curr_rp->start;
+
+ /*
+ * Link the last body region to the content terminator record.
+ */
+ rec_fprintf(state->dst, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
+ (long) state->xtra_offset);
+ curr_rp->write_offs = vstream_ftell(state->dst);
+ cleanup_region_close(state, curr_rp);
+
+ return (CLEANUP_OUT_OK(state) ? 0 : -1);
+}
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