Import notmuch_0.28.2.orig.tar.gz

[dgit import orig notmuch_0.28.2.orig.tar.gz]

1 files changed, 401 insertions, 0 deletions

diff --git a/mime-node.c b/mime-node.c
new file mode 100644
index 00000000..2a24e537
--- /dev/null
+++ b/mime-node.c
@@ -0,0 +1,401 @@
+/* notmuch - Not much of an email program, (just index and search)
+ *
+ * Copyright © 2009 Carl Worth
+ * Copyright © 2009 Keith Packard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/ .
+ *
+ * Authors: Carl Worth <cworth@cworth.org>
+ *          Keith Packard <keithp@keithp.com>
+ *          Austin Clements <aclements@csail.mit.edu>
+ */
+
+#include "notmuch-client.h"
+
+/* Context that gets inherited from the root node. */
+typedef struct mime_node_context {
+    /* Per-message resources.  These are allocated internally and must
+     * be destroyed. */
+    FILE *file;
+    GMimeStream *stream;
+    GMimeParser *parser;
+    GMimeMessage *mime_message;
+
+    /* Context provided by the caller. */
+    _notmuch_crypto_t *crypto;
+} mime_node_context_t;
+
+static int
+_mime_node_context_free (mime_node_context_t *res)
+{
+    if (res->mime_message)
+	g_object_unref (res->mime_message);
+
+    if (res->parser)
+	g_object_unref (res->parser);
+
+    if (res->stream)
+	g_object_unref (res->stream);
+
+    if (res->file)
+	fclose (res->file);
+
+    return 0;
+}
+
+notmuch_status_t
+mime_node_open (const void *ctx, notmuch_message_t *message,
+		_notmuch_crypto_t *crypto, mime_node_t **root_out)
+{
+    const char *filename = notmuch_message_get_filename (message);
+    mime_node_context_t *mctx;
+    mime_node_t *root;
+    notmuch_status_t status;
+
+    root = talloc_zero (ctx, mime_node_t);
+    if (root == NULL) {
+	fprintf (stderr, "Out of memory.\n");
+	status = NOTMUCH_STATUS_OUT_OF_MEMORY;
+	goto DONE;
+    }
+
+    /* Create the tree-wide context */
+    mctx = talloc_zero (root, mime_node_context_t);
+    if (mctx == NULL) {
+	fprintf (stderr, "Out of memory.\n");
+	status = NOTMUCH_STATUS_OUT_OF_MEMORY;
+	goto DONE;
+    }
+    talloc_set_destructor (mctx, _mime_node_context_free);
+
+    /* Fast path */
+    mctx->file = fopen (filename, "r");
+    if (! mctx->file) {
+	/* Slow path - for some reason the first file in the list is
+	 * not available anymore. This is clearly a problem in the
+	 * database, but we are not going to let this problem be a
+	 * show stopper */
+	notmuch_filenames_t *filenames;
+	for (filenames = notmuch_message_get_filenames (message);
+	     notmuch_filenames_valid (filenames);
+	     notmuch_filenames_move_to_next (filenames))
+	{
+	    filename = notmuch_filenames_get (filenames);
+	    mctx->file = fopen (filename, "r");
+	    if (mctx->file)
+		break;
+	}
+
+	talloc_free (filenames);
+	if (! mctx->file) {
+	    /* Give up */
+	    fprintf (stderr, "Error opening %s: %s\n", filename, strerror (errno));
+		status = NOTMUCH_STATUS_FILE_ERROR;
+		goto DONE;
+	    }
+	}
+
+    mctx->stream = g_mime_stream_file_new (mctx->file);
+    if (!mctx->stream) {
+	fprintf (stderr, "Out of memory.\n");
+	status = NOTMUCH_STATUS_OUT_OF_MEMORY;
+	goto DONE;
+    }
+    g_mime_stream_file_set_owner (GMIME_STREAM_FILE (mctx->stream), false);
+
+    mctx->parser = g_mime_parser_new_with_stream (mctx->stream);
+    if (!mctx->parser) {
+	fprintf (stderr, "Out of memory.\n");
+	status = NOTMUCH_STATUS_OUT_OF_MEMORY;
+	goto DONE;
+    }
+
+    mctx->mime_message = g_mime_parser_construct_message (mctx->parser);
+    if (!mctx->mime_message) {
+	fprintf (stderr, "Failed to parse %s\n", filename);
+	status = NOTMUCH_STATUS_FILE_ERROR;
+	goto DONE;
+    }
+
+    mctx->crypto = crypto;
+
+    /* Create the root node */
+    root->part = GMIME_OBJECT (mctx->mime_message);
+    root->envelope_file = message;
+    root->nchildren = 1;
+    root->ctx = mctx;
+
+    root->parent = NULL;
+    root->part_num = 0;
+    root->next_child = 0;
+    root->next_part_num = 1;
+
+    *root_out = root;
+    return NOTMUCH_STATUS_SUCCESS;
+
+DONE:
+    talloc_free (root);
+    return status;
+}
+
+/* Signature list destructor (GMime 2.6) */
+static int
+_signature_list_free (GMimeSignatureList **proxy)
+{
+    g_object_unref (*proxy);
+    return 0;
+}
+
+/* Set up signature list destructor (GMime 2.6) */
+static void
+set_signature_list_destructor (mime_node_t *node)
+{
+    GMimeSignatureList **proxy = talloc (node, GMimeSignatureList *);
+    if (proxy) {
+	*proxy = node->sig_list;
+	talloc_set_destructor (proxy, _signature_list_free);
+    }
+}
+
+/* Verify a signed mime node (GMime 2.6) */
+static void
+node_verify (mime_node_t *node, GMimeObject *part,
+	     g_mime_3_unused(GMimeCryptoContext *cryptoctx))
+{
+    GError *err = NULL;
+
+    node->verify_attempted = true;
+    node->sig_list = g_mime_multipart_signed_verify
+	(GMIME_MULTIPART_SIGNED (part), cryptoctx, &err);
+
+    if (node->sig_list)
+	set_signature_list_destructor (node);
+    else
+	fprintf (stderr, "Failed to verify signed part: %s\n",
+		 err ? err->message : "no error explanation given");
+
+    if (err)
+	g_error_free (err);
+}
+
+/* Decrypt and optionally verify an encrypted mime node (GMime 2.6) */
+static void
+node_decrypt_and_verify (mime_node_t *node, GMimeObject *part,
+			 g_mime_3_unused(GMimeCryptoContext *cryptoctx))
+{
+    GError *err = NULL;
+    GMimeDecryptResult *decrypt_result = NULL;
+    GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part);
+    notmuch_message_t *message = NULL;
+
+    if (! node->decrypted_child) {
+	for (mime_node_t *parent = node; parent; parent = parent->parent)
+	    if (parent->envelope_file) {
+		message = parent->envelope_file;
+		break;
+	    }
+
+	node->decrypted_child = _notmuch_crypto_decrypt (&node->decrypt_attempted,
+							 node->ctx->crypto->decrypt,
+							 message,
+							 cryptoctx, encrypteddata, &decrypt_result, &err);
+    }
+    if (! node->decrypted_child) {
+	fprintf (stderr, "Failed to decrypt part: %s\n",
+		 err ? err->message : "no error explanation given");
+	goto DONE;
+    }
+
+    node->decrypt_success = true;
+    node->verify_attempted = true;
+
+    if (decrypt_result) {
+	/* This may be NULL if the part is not signed. */
+	node->sig_list = g_mime_decrypt_result_get_signatures (decrypt_result);
+	if (node->sig_list) {
+	    g_object_ref (node->sig_list);
+	    set_signature_list_destructor (node);
+	}
+
+#if HAVE_GMIME_SESSION_KEYS
+	if (node->ctx->crypto->decrypt == NOTMUCH_DECRYPT_TRUE && message) {
+	    notmuch_database_t *db = notmuch_message_get_database (message);
+	    const char *session_key = g_mime_decrypt_result_get_session_key (decrypt_result);
+	    if (db && session_key)
+		print_status_message ("Failed to stash session key in the database",
+				      message,
+				      notmuch_message_add_property (message, "session-key",
+								    session_key));
+	}
+#endif
+	g_object_unref (decrypt_result);
+    }
+
+ DONE:
+    if (err)
+	g_error_free (err);
+}
+
+static mime_node_t *
+_mime_node_create (mime_node_t *parent, GMimeObject *part)
+{
+    mime_node_t *node = talloc_zero (parent, mime_node_t);
+    GMimeCryptoContext *cryptoctx = NULL;
+
+    /* Set basic node properties */
+    node->part = part;
+    node->ctx = parent->ctx;
+    if (!talloc_reference (node, node->ctx)) {
+	fprintf (stderr, "Out of memory.\n");
+	talloc_free (node);
+	return NULL;
+    }
+    node->parent = parent;
+    node->part_num = node->next_part_num = -1;
+    node->next_child = 0;
+
+    /* Deal with the different types of parts */
+    if (GMIME_IS_PART (part)) {
+	node->nchildren = 0;
+    } else if (GMIME_IS_MULTIPART (part)) {
+	node->nchildren = g_mime_multipart_get_count (GMIME_MULTIPART (part));
+    } else if (GMIME_IS_MESSAGE_PART (part)) {
+	/* Promote part to an envelope and open it */
+	GMimeMessagePart *message_part = GMIME_MESSAGE_PART (part);
+	GMimeMessage *message = g_mime_message_part_get_message (message_part);
+	node->envelope_part = message_part;
+	node->part = GMIME_OBJECT (message);
+	node->nchildren = 1;
+    } else {
+	fprintf (stderr, "Warning: Unknown mime part type: %s.\n",
+		 g_type_name (G_OBJECT_TYPE (part)));
+	talloc_free (node);
+	return NULL;
+    }
+
+#if (GMIME_MAJOR_VERSION < 3)
+    if ((GMIME_IS_MULTIPART_ENCRYPTED (part) && (node->ctx->crypto->decrypt != NOTMUCH_DECRYPT_FALSE))
+	|| (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify)) {
+	GMimeContentType *content_type = g_mime_object_get_content_type (part);
+	const char *protocol = g_mime_content_type_get_parameter (content_type, "protocol");
+	notmuch_status_t status;
+	status = _notmuch_crypto_get_gmime_ctx_for_protocol (node->ctx->crypto,
+							     protocol, &cryptoctx);
+	if (status) /* this is a warning, not an error */
+	    fprintf (stderr, "Warning: %s (%s).\n", notmuch_status_to_string (status),
+		     protocol ? protocol : "NULL");
+	if (!cryptoctx)
+	    return node;
+    }
+#endif
+
+    /* Handle PGP/MIME parts */
+    if (GMIME_IS_MULTIPART_ENCRYPTED (part) && (node->ctx->crypto->decrypt != NOTMUCH_DECRYPT_FALSE)) {
+	if (node->nchildren != 2) {
+	    /* this violates RFC 3156 section 4, so we won't bother with it. */
+	    fprintf (stderr, "Error: %d part(s) for a multipart/encrypted "
+		     "message (must be exactly 2)\n",
+		     node->nchildren);
+	} else {
+	    node_decrypt_and_verify (node, part, cryptoctx);
+	}
+    } else if (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify) {
+	if (node->nchildren != 2) {
+	    /* this violates RFC 3156 section 5, so we won't bother with it. */
+	    fprintf (stderr, "Error: %d part(s) for a multipart/signed message "
+		     "(must be exactly 2)\n",
+		     node->nchildren);
+	} else {
+	    node_verify (node, part, cryptoctx);
+	}
+    }
+
+    return node;
+}
+
+mime_node_t *
+mime_node_child (mime_node_t *parent, int child)
+{
+    GMimeObject *sub;
+    mime_node_t *node;
+
+    if (!parent || !parent->part || child < 0 || child >= parent->nchildren)
+	return NULL;
+
+    if (GMIME_IS_MULTIPART (parent->part)) {
+	if (child == 1 && parent->decrypted_child)
+	    sub = parent->decrypted_child;
+	else
+	    sub = g_mime_multipart_get_part
+		(GMIME_MULTIPART (parent->part), child);
+    } else if (GMIME_IS_MESSAGE (parent->part)) {
+	sub = g_mime_message_get_mime_part (GMIME_MESSAGE (parent->part));
+    } else {
+	/* This should have been caught by message_part_create */
+	INTERNAL_ERROR ("Unexpected GMimeObject type: %s",
+			g_type_name (G_OBJECT_TYPE (parent->part)));
+    }
+    node = _mime_node_create (parent, sub);
+
+    if (child == parent->next_child && parent->next_part_num != -1) {
+	/* We're traversing in depth-first order.  Record the child's
+	 * depth-first numbering. */
+	node->part_num = parent->next_part_num;
+	node->next_part_num = node->part_num + 1;
+
+	/* Prepare the parent for its next depth-first child. */
+	parent->next_child++;
+	parent->next_part_num = -1;
+
+	if (node->nchildren == 0) {
+	    /* We've reached a leaf, so find the parent that has more
+	     * children and set it up to number its next child. */
+	    mime_node_t *iter = node->parent;
+	    while (iter && iter->next_child == iter->nchildren)
+		iter = iter->parent;
+	    if (iter)
+		iter->next_part_num = node->part_num + 1;
+	}
+    }
+
+    return node;
+}
+
+static mime_node_t *
+_mime_node_seek_dfs_walk (mime_node_t *node, int *n)
+{
+    int i;
+
+    if (*n == 0)
+	return node;
+
+    *n -= 1;
+    for (i = 0; i < node->nchildren; i++) {
+	mime_node_t *child = mime_node_child (node, i);
+	mime_node_t *ret = _mime_node_seek_dfs_walk (child, n);
+	if (ret)
+	    return ret;
+
+	talloc_free (child);
+    }
+    return NULL;
+}
+
+mime_node_t *
+mime_node_seek_dfs (mime_node_t *node, int n)
+{
+    if (n < 0)
+	return NULL;
+    return _mime_node_seek_dfs_walk (node, &n);
+}