From: Carl Worth Date: Fri, 5 Feb 2010 01:08:11 +0000 (-0800) Subject: notmuch new: Don't index uuencoded data. X-Git-Tag: 0.1~117 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=3767c6f9f9c4719f36569daa05cd56470b3fd00f;p=notmuch.git notmuch new: Don't index uuencoded data. With modern MIME attachments, we're already avoiding indexing the attachments. But for old-school uuencoded data in the mail, we have been directly indexing the encoded data as terms, (which is not useful at all---nobody will ever ytry to search based on the seemingly random uuencoded data). Additionally, indexing a modestly large uuencoded file seems to make Xapian go insane, (consuming *lots* of memory). We fix both problems by detecting uuencoded content and not performing any indexing of it. --- diff --git a/lib/index.cc b/lib/index.cc index 7e2da085..0eb2774a 100644 --- a/lib/index.cc +++ b/lib/index.cc @@ -20,9 +20,234 @@ #include "notmuch-private.h" #include +#include #include +/* Oh, how I wish that gobject didn't require so much noisy boilerplate! */ +#define NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE (notmuch_filter_discard_uuencode_get_type ()) +#define NOTMUCH_FILTER_DISCARD_UUENCODE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE, NotmuchFilterDiscardUuencode)) +#define NOTMUCH_FILTER_DISCARD_UUENCODE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE, NotmuchFilterDiscardUuencodeClass)) +#define NOTMUCH_IS_FILTER_DISCARD_UUENCODE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE)) +#define NOTMUCH_IS_FILTER_DISCARD_UUENCODE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE)) +#define NOTMUCH_FILTER_DISCARD_UUENCODE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE, NotmuchFilterDiscardUuencodeClass)) + +typedef struct _NotmuchFilterDiscardUuencode NotmuchFilterDiscardUuencode; +typedef struct _NotmuchFilterDiscardUuencodeClass NotmuchFilterDiscardUuencodeClass; + +/** + * NotmuchFilterDiscardUuencode: + * + * @parent_object: parent #GMimeFilter + * @encode: encoding vs decoding + * @state: State of the parser + * + * A filter to discard uuencoded portions of an email. + * + * A uuencoded portion is identified as beginning with a line + * matching: + * + * begin [0-7][0-7][0-7] .* + * + * After that detection, and beginning with the following line, + * characters will be discarded as long as the first character of each + * line begins with M and subsequent characters on the line are within + * the range of ASCII characters from ' ' to '`'. + * + * This is not a perfect UUencode filter. It's possible to have a + * message that will legitimately match that pattern, (so that some + * legitimate content is discarded). And for most UUencoded files, the + * final line of encoded data (the line not starting with M) will be + * indexed. + **/ +struct _NotmuchFilterDiscardUuencode { + GMimeFilter parent_object; + int state; +}; + +struct _NotmuchFilterDiscardUuencodeClass { + GMimeFilterClass parent_class; +}; + +GType notmuch_filter_discard_uuencode_get_type (void); + +GMimeFilter *notmuch_filter_discard_uuencode_new (void); + +static void notmuch_filter_discard_uuencode_class_init (NotmuchFilterDiscardUuencodeClass *klass); +static void notmuch_filter_discard_uuencode_init (NotmuchFilterDiscardUuencode *filter, NotmuchFilterDiscardUuencodeClass *klass); +static void notmuch_filter_discard_uuencode_finalize (GObject *object); + +static GMimeFilter *filter_copy (GMimeFilter *filter); +static void filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace, + char **out, size_t *outlen, size_t *outprespace); +static void filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace, + char **out, size_t *outlen, size_t *outprespace); +static void filter_reset (GMimeFilter *filter); + + +static GMimeFilterClass *parent_class = NULL; + +GType +notmuch_filter_discard_uuencode_get_type (void) +{ + static GType type = 0; + + if (!type) { + static const GTypeInfo info = { + sizeof (NotmuchFilterDiscardUuencodeClass), + NULL, /* base_class_init */ + NULL, /* base_class_finalize */ + (GClassInitFunc) notmuch_filter_discard_uuencode_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (NotmuchFilterDiscardUuencode), + 0, /* n_preallocs */ + (GInstanceInitFunc) notmuch_filter_discard_uuencode_init, + NULL /* value_table */ + }; + + type = g_type_register_static (GMIME_TYPE_FILTER, "NotmuchFilterDiscardUuencode", &info, (GTypeFlags) 0); + } + + return type; +} + +static void +notmuch_filter_discard_uuencode_class_init (NotmuchFilterDiscardUuencodeClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GMimeFilterClass *filter_class = GMIME_FILTER_CLASS (klass); + + parent_class = (GMimeFilterClass *) g_type_class_ref (GMIME_TYPE_FILTER); + + object_class->finalize = notmuch_filter_discard_uuencode_finalize; + + filter_class->copy = filter_copy; + filter_class->filter = filter_filter; + filter_class->complete = filter_complete; + filter_class->reset = filter_reset; +} + +static void +notmuch_filter_discard_uuencode_init (NotmuchFilterDiscardUuencode *filter, NotmuchFilterDiscardUuencodeClass *klass) +{ + (void) klass; + filter->state = 0; +} + +static void +notmuch_filter_discard_uuencode_finalize (GObject *object) +{ + G_OBJECT_CLASS (parent_class)->finalize (object); +} + +static GMimeFilter * +filter_copy (GMimeFilter *gmime_filter) +{ + (void) gmime_filter; + return notmuch_filter_discard_uuencode_new (); +} + +static void +filter_filter (GMimeFilter *gmime_filter, char *inbuf, size_t inlen, size_t prespace, + char **outbuf, size_t *outlen, size_t *outprespace) +{ + NotmuchFilterDiscardUuencode *filter = (NotmuchFilterDiscardUuencode *) gmime_filter; + register const char *inptr = inbuf; + const char *inend = inbuf + inlen; + char *outptr; + + (void) prespace; + + /* Simple, linear state-transition diagram for our filter. + * + * If the character being processed is within the range of [a, b] + * for the current state then we transition next_if_match + * state. If not, we transition to the next_if_not_match state. + * + * The final two states are special in that they are the states in + * which we discard data. */ + static const struct { + int state; + int a; + int b; + int next_if_match; + int next_if_not_match; + } states[] = { + {0, 'b', 'b', 1, 0}, + {1, 'e', 'e', 2, 0}, + {2, 'g', 'g', 3, 0}, + {3, 'i', 'i', 4, 0}, + {4, 'n', 'n', 5, 0}, + {5, ' ', ' ', 6, 0}, + {6, '0', '7', 7, 0}, + {7, '0', '7', 8, 0}, + {8, '0', '7', 9, 0}, + {9, ' ', ' ', 10, 0}, + {10, '\n', '\n', 11, 10}, + {11, 'M', 'M', 12, 0}, + {12, ' ', '`', 12, 11} + }; + int next; + + g_mime_filter_set_size (gmime_filter, inlen, FALSE); + outptr = gmime_filter->outbuf; + + while (inptr < inend) { + if (*inptr >= states[filter->state].a && + *inptr <= states[filter->state].b) + { + next = states[filter->state].next_if_match; + } + else + { + next = states[filter->state].next_if_not_match; + } + + if (filter->state < 11) + *outptr++ = *inptr; + + filter->state = next; + inptr++; + } + + *outlen = outptr - gmime_filter->outbuf; + *outprespace = gmime_filter->outpre; + *outbuf = gmime_filter->outbuf; +} + +static void +filter_complete (GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace, + char **outbuf, size_t *outlen, size_t *outprespace) +{ + if (inbuf && inlen) + filter_filter (filter, inbuf, inlen, prespace, outbuf, outlen, outprespace); +} + +static void +filter_reset (GMimeFilter *gmime_filter) +{ + NotmuchFilterDiscardUuencode *filter = (NotmuchFilterDiscardUuencode *) gmime_filter; + + filter->state = 0; +} + +/** + * notmuch_filter_discard_uuencode_new: + * + * Returns: a new #NotmuchFilterDiscardUuencode filter. + **/ +GMimeFilter * +notmuch_filter_discard_uuencode_new (void) +{ + NotmuchFilterDiscardUuencode *filter; + + filter = (NotmuchFilterDiscardUuencode *) g_object_newv (NOTMUCH_TYPE_FILTER_DISCARD_UUENCODE, 0, NULL); + filter->state = 0; + + return (GMimeFilter *) filter; +} + /* We're finally down to a single (NAME + address) email "mailbox". */ static void _index_address_mailbox (notmuch_message_t *message, @@ -128,7 +353,8 @@ static void _index_mime_part (notmuch_message_t *message, GMimeObject *part) { - GMimeStream *stream; + GMimeStream *stream, *filter; + GMimeFilter *discard_uuencode_filter; GMimeDataWrapper *wrapper; GByteArray *byte_array; GMimeContentDisposition *disposition; @@ -186,11 +412,20 @@ _index_mime_part (notmuch_message_t *message, stream = g_mime_stream_mem_new_with_byte_array (byte_array); g_mime_stream_mem_set_owner (GMIME_STREAM_MEM (stream), FALSE); + + filter = g_mime_stream_filter_new (stream); + discard_uuencode_filter = notmuch_filter_discard_uuencode_new (); + + g_mime_stream_filter_add (GMIME_STREAM_FILTER (filter), + discard_uuencode_filter); + wrapper = g_mime_part_get_content_object (GMIME_PART (part)); if (wrapper) - g_mime_data_wrapper_write_to_stream (wrapper, stream); + g_mime_data_wrapper_write_to_stream (wrapper, filter); g_object_unref (stream); + g_object_unref (filter); + g_object_unref (discard_uuencode_filter); g_byte_array_append (byte_array, (guint8 *) "\0", 1); body = (char *) g_byte_array_free (byte_array, FALSE);