diff options
Diffstat (limited to '')
| -rw-r--r-- | src/lib-storage/index/istream-mail.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/lib-storage/index/istream-mail.c b/src/lib-storage/index/istream-mail.c new file mode 100644 index 0000000..1477823 --- /dev/null +++ b/src/lib-storage/index/istream-mail.c @@ -0,0 +1,173 @@ +/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */ + +#include "lib.h" +#include "mail-storage-private.h" +#include "istream-private.h" +#include "index-mail.h" +#include "istream-mail.h" + +struct mail_istream { + struct istream_private istream; + + struct mail *mail; + uoff_t expected_size; + bool files_read_increased:1; + bool input_has_body:1; +}; + +static bool i_stream_mail_try_get_cached_size(struct mail_istream *mstream) +{ + struct mail *mail = mstream->mail; + enum mail_lookup_abort orig_lookup_abort; + + if (mstream->expected_size != UOFF_T_MAX) + return TRUE; + + /* make sure this call doesn't change any existing error message, + just in case there's already something important in it. */ + mail_storage_last_error_push(mail->box->storage); + orig_lookup_abort = mail->lookup_abort; + mail->lookup_abort = MAIL_LOOKUP_ABORT_NOT_IN_CACHE; + if (mail_get_physical_size(mail, &mstream->expected_size) < 0) + mstream->expected_size = UOFF_T_MAX; + mail->lookup_abort = orig_lookup_abort; + mail_storage_last_error_pop(mail->box->storage); + return mstream->expected_size != UOFF_T_MAX; +} + +static const char * +i_stream_mail_get_cached_mail_id(struct mail_istream *mstream ATTR_UNUSED) +{ +#if 0 + /* FIXME: This function may get called in the middle of header parsing, + which then goes into parsing cached headers and causes crashes. + So disable this for now. Eventually it would be nice if recursion + was possible by each parser using its own private struct. */ + static const char *headers[] = { + "Message-Id", + "Date", + "Subject" + }; + struct mail *mail = mstream->mail; + enum mail_lookup_abort orig_lookup_abort; + const char *value, *ret = ""; + unsigned int i; + + orig_lookup_abort = mail->lookup_abort; + mail->lookup_abort = MAIL_LOOKUP_ABORT_NOT_IN_CACHE; + for (i = 0; i < N_ELEMENTS(headers); i++) { + if (mail_get_first_header(mail, headers[i], &value) > 0) { + ret = t_strdup_printf("%s=%s", headers[i], value); + break; + } + } + mail->lookup_abort = orig_lookup_abort; + return ret; +#else + return ""; +#endif +} + +static void +i_stream_mail_set_size_corrupted(struct mail_istream *mstream, size_t size) +{ + uoff_t cur_size = mstream->istream.istream.v_offset + size; + const char *str, *mail_id; + char chr; + + if (mstream->expected_size < cur_size) { + /* input stream is larger than cached message size */ + str = "smaller"; + chr = '<'; + mstream->istream.istream.stream_errno = EINVAL; + } else { + /* input stream is smaller than cached message size */ + str = "larger"; + chr = '>'; + mstream->istream.istream.stream_errno = EPIPE; + } + + mail_id = i_stream_mail_get_cached_mail_id(mstream); + if (mail_id[0] != '\0') + mail_id = t_strconcat(", cached ", mail_id, NULL); + io_stream_set_error(&mstream->istream.iostream, + "Cached message size %s than expected " + "(%"PRIuUOFF_T" %c %"PRIuUOFF_T", box=%s, UID=%u%s)", str, + mstream->expected_size, chr, cur_size, + mailbox_get_vname(mstream->mail->box), + mstream->mail->uid, mail_id); + mail_set_cache_corrupted(mstream->mail, MAIL_FETCH_PHYSICAL_SIZE, + t_strdup_printf("read(%s) failed: %s", + i_stream_get_name(&mstream->istream.istream), + mstream->istream.iostream.error)); +} + +static ssize_t +i_stream_mail_read(struct istream_private *stream) +{ + struct mail_istream *mstream = (struct mail_istream *)stream; + size_t size; + ssize_t ret; + + i_stream_seek(stream->parent, stream->parent_start_offset + + stream->istream.v_offset); + + ret = i_stream_read_copy_from_parent(&stream->istream); + size = i_stream_get_data_size(&stream->istream); + if (ret > 0) { + mstream->mail->transaction->stats.files_read_bytes += ret; + if (!mstream->files_read_increased) { + mstream->files_read_increased = TRUE; + mstream->mail->transaction->stats.files_read_count++; + } + if (mstream->expected_size < stream->istream.v_offset + size) { + i_stream_mail_set_size_corrupted(mstream, size); + /* istream code expects that the position has not changed + when read error occurs, so move pos back. */ + i_assert(stream->pos >= (size_t)ret); + stream->pos -= ret; + return -1; + } + } else if (ret == -1 && stream->istream.eof) { + if (!mstream->input_has_body) { + /* trying to read past the header, but this stream + doesn't have the body */ + return -1; + } + if (stream->istream.stream_errno != 0) { + if (stream->istream.stream_errno == ENOENT) { + /* update mail's expunged-flag if needed */ + index_mail_refresh_expunged(mstream->mail); + } + return -1; + } + if (i_stream_mail_try_get_cached_size(mstream) && + mstream->expected_size > stream->istream.v_offset + size) { + i_stream_mail_set_size_corrupted(mstream, size); + return -1; + } + } + return ret; +} + +struct istream *i_stream_create_mail(struct mail *mail, struct istream *input, + bool input_has_body) +{ + struct mail_istream *mstream; + + mstream = i_new(struct mail_istream, 1); + mstream->mail = mail; + mstream->input_has_body = input_has_body; + mstream->expected_size = UOFF_T_MAX; + (void)i_stream_mail_try_get_cached_size(mstream); + mstream->istream.max_buffer_size = input->real_stream->max_buffer_size; + mstream->istream.stream_size_passthrough = TRUE; + + mstream->istream.read = i_stream_mail_read; + + mstream->istream.istream.readable_fd = input->readable_fd; + mstream->istream.istream.blocking = input->blocking; + mstream->istream.istream.seekable = input->seekable; + return i_stream_create(&mstream->istream, input, + i_stream_get_fd(input), 0); +} |