Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib-storage/index/mbox/mbox-save.c @ 6422:18173a52f721 HEAD
Renamed strocpy() to i_strocpy().
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Sun, 16 Sep 2007 13:30:31 +0300 |
parents | 6a64e64fa3a3 |
children | 65c69a53a7be |
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/* Copyright (C) 2002-2007 Timo Sirainen */ #include "lib.h" #include "ioloop.h" #include "array.h" #include "base64.h" #include "hostpid.h" #include "randgen.h" #include "istream.h" #include "ostream.h" #include "str.h" #include "write-full.h" #include "istream-header-filter.h" #include "ostream-crlf.h" #include "message-parser.h" #include "index-mail.h" #include "mbox-storage.h" #include "mbox-file.h" #include "mbox-from.h" #include "mbox-lock.h" #include "mbox-md5.h" #include "mbox-sync-private.h" #include <stddef.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/stat.h> #include <netdb.h> #include <utime.h> #define MBOX_DELIVERY_ID_RAND_BYTES (64/8) struct mbox_save_context { struct mail_save_context ctx; struct mbox_mailbox *mbox; struct mail_index_transaction *trans; struct mail *mail; uoff_t append_offset, mail_offset; time_t orig_atime; time_t received_date; string_t *headers; size_t space_end_idx; uint32_t seq, next_uid, uid_validity, first_saved_uid; struct istream *input; struct ostream *output, *body_output; uoff_t extra_hdr_offset, eoh_offset; char last_char; struct mbox_md5_context *mbox_md5_ctx; unsigned int x_delivery_id_pos; unsigned int synced:1; unsigned int failed:1; unsigned int finished:1; }; static char my_hostdomain[256] = ""; static int write_error(struct mbox_save_context *ctx) { mbox_set_syscall_error(ctx->mbox, "write()"); ctx->failed = TRUE; return -1; } static int mbox_seek_to_end(struct mbox_save_context *ctx, uoff_t *offset) { struct stat st; char ch; int fd; if (ctx->mbox->mbox_writeonly) { *offset = 0; return 0; } fd = ctx->mbox->mbox_fd; if (fstat(fd, &st) < 0) return mbox_set_syscall_error(ctx->mbox, "fstat()"); ctx->orig_atime = st.st_atime; *offset = (uoff_t)st.st_size; if (st.st_size == 0) return 0; if (lseek(fd, st.st_size-1, SEEK_SET) < 0) return mbox_set_syscall_error(ctx->mbox, "lseek()"); if (read(fd, &ch, 1) != 1) return mbox_set_syscall_error(ctx->mbox, "read()"); if (ch != '\n') { if (write_full(fd, "\n", 1) < 0) return write_error(ctx); *offset += 1; } return 0; } static int mbox_append_lf(struct mbox_save_context *ctx) { if (o_stream_send(ctx->output, "\n", 1) < 0) return write_error(ctx); return 0; } static int write_from_line(struct mbox_save_context *ctx, time_t received_date, const char *from_envelope) { const char *line, *name; int ret; if (*my_hostdomain == '\0') { struct hostent *hent; hent = gethostbyname(my_hostname); name = hent != NULL ? hent->h_name : NULL; if (name == NULL) { /* failed, use just the hostname */ name = my_hostname; } i_strocpy(my_hostdomain, name, sizeof(my_hostdomain)); } t_push(); if (from_envelope == NULL) { from_envelope = t_strconcat(ctx->mbox->storage->storage.user, "@", my_hostdomain, NULL); } /* save in local timezone, no matter what it was given with */ line = mbox_from_create(from_envelope, received_date); if ((ret = o_stream_send_str(ctx->output, line)) < 0) write_error(ctx); t_pop(); return ret; } static int mbox_write_content_length(struct mbox_save_context *ctx) { uoff_t end_offset; const char *str; size_t len; if (ctx->mbox->mbox_writeonly) { /* we can't seek, don't set Content-Length */ return 0; } end_offset = ctx->output->offset; /* write Content-Length headers */ str = t_strdup_printf("\nContent-Length: %s", dec2str(end_offset - ctx->eoh_offset)); len = strlen(str); /* flush manually here so that we don't confuse seek() errors with buffer flushing errors */ if (o_stream_flush(ctx->output) < 0) return write_error(ctx); if (o_stream_seek(ctx->output, ctx->extra_hdr_offset + ctx->space_end_idx - len) < 0) return mbox_set_syscall_error(ctx->mbox, "o_stream_seek()"); if (o_stream_send(ctx->output, str, len) < 0 || o_stream_flush(ctx->output) < 0) return write_error(ctx); if (o_stream_seek(ctx->output, end_offset) < 0) return mbox_set_syscall_error(ctx->mbox, "o_stream_seek()"); return 0; } static void mbox_save_init_sync(struct mbox_transaction_context *t) { struct mbox_mailbox *mbox = (struct mbox_mailbox *)t->ictx.ibox; struct mbox_save_context *ctx = t->save_ctx; const struct mail_index_header *hdr; struct mail_index_view *view; /* open a new view to get the header. this is required if we just synced the mailbox so we can get updated next_uid. */ view = mail_index_view_open(mbox->ibox.index); hdr = mail_index_get_header(view); ctx->next_uid = hdr->next_uid; ctx->first_saved_uid = ctx->next_uid; ctx->uid_validity = hdr->uid_validity; ctx->synced = TRUE; t->mbox_modified = TRUE; mail_index_view_close(&view); } static void status_flags_append(string_t *str, enum mail_flags flags, const struct mbox_flag_type *flags_list) { int i; flags ^= MBOX_NONRECENT_KLUDGE; for (i = 0; flags_list[i].chr != 0; i++) { if ((flags & flags_list[i].flag) != 0) str_append_c(str, flags_list[i].chr); } flags ^= MBOX_NONRECENT_KLUDGE; } static void mbox_save_append_flag_headers(string_t *str, enum mail_flags flags) { if ((flags & STATUS_FLAGS_MASK) != 0) { str_append(str, "Status: "); status_flags_append(str, flags, mbox_status_flags); str_append_c(str, '\n'); } if ((flags & XSTATUS_FLAGS_MASK) != 0) { str_append(str, "X-Status: "); status_flags_append(str, flags, mbox_xstatus_flags); str_append_c(str, '\n'); } } static void mbox_save_append_keyword_headers(struct mbox_save_context *ctx, struct mail_keywords *keywords) { unsigned char space[MBOX_HEADER_PADDING+1 + sizeof("Content-Length: \n")-1 + MAX_INT_STRLEN]; const ARRAY_TYPE(keywords) *keyword_names_list; const char *const *keyword_names; unsigned int i, count, keyword_names_count; keyword_names_list = mail_index_get_keywords(ctx->mbox->ibox.index); keyword_names = array_get(keyword_names_list, &keyword_names_count); str_append(ctx->headers, "X-Keywords:"); count = keywords == NULL ? 0 : keywords->count; for (i = 0; i < count; i++) { i_assert(keywords->idx[i] < keyword_names_count); str_append_c(ctx->headers, ' '); str_append(ctx->headers, keyword_names[keywords->idx[i]]); } memset(space, ' ', sizeof(space)); str_append_n(ctx->headers, space, sizeof(space)); ctx->space_end_idx = str_len(ctx->headers); str_append_c(ctx->headers, '\n'); } static int mbox_save_init_file(struct mbox_save_context *ctx, struct mbox_transaction_context *t, bool want_mail) { struct mbox_mailbox *mbox = ctx->mbox; struct mail_storage *storage = &mbox->storage->storage; int ret; if (ctx->mbox->mbox_readonly) { mail_storage_set_error(storage, MAIL_ERROR_PERM, "Read-only mbox"); return -1; } if ((t->ictx.flags & MAILBOX_TRANSACTION_FLAG_ASSIGN_UIDS) != 0) want_mail = TRUE; if (ctx->append_offset == (uoff_t)-1) { /* first appended mail in this transaction */ if (mbox->mbox_lock_type != F_WRLCK) { if (mbox->mbox_lock_type == F_RDLCK) { /* FIXME: we shouldn't fail here. it's just a locking issue that should be possible to fix.. */ mail_storage_set_error(storage, MAIL_ERROR_NOTPOSSIBLE, "Can't copy mails inside same mailbox"); return -1; } if (mbox_lock(mbox, F_WRLCK, &t->mbox_lock_id) <= 0) return -1; } if (mbox->mbox_fd == -1) { if (mbox_file_open(mbox) < 0) return -1; } /* update mbox_sync_dirty state */ ret = mbox_sync_has_changed(mbox, TRUE); if (ret < 0) return -1; if (!want_mail && ret == 0) { /* we're not required to assign UIDs for the appended mails immediately. do it only if it doesn't require syncing. */ mbox_save_init_sync(t); } } if (!ctx->synced && want_mail) { /* we'll need to assign UID for the mail immediately. */ if (mbox_sync(mbox, 0) < 0) return -1; mbox_save_init_sync(t); } /* the syncing above could have changed the append offset */ if (ctx->append_offset == (uoff_t)-1) { if (mbox_seek_to_end(ctx, &ctx->append_offset) < 0) return -1; ctx->output = o_stream_create_fd_file(mbox->mbox_fd, ctx->append_offset, FALSE); } return 0; } static void save_header_callback(struct message_header_line *hdr, bool *matched, struct mbox_save_context *ctx) { if (hdr != NULL) { if (strncmp(hdr->name, "From ", 5) == 0) { /* we can't allow From_-lines in headers. there's no legitimate reason for allowing them in any case, so just drop them. */ *matched = TRUE; return; } if (!*matched && ctx->mbox_md5_ctx != NULL) mbox_md5_continue(ctx->mbox_md5_ctx, hdr); } } static void mbox_save_x_delivery_id(struct mbox_save_context *ctx) { unsigned char md5_result[MD5_RESULTLEN]; buffer_t *buf; void *randbuf; t_push(); buf = buffer_create_dynamic(pool_datastack_create(), 256); buffer_append(buf, &ioloop_time, sizeof(ioloop_time)); buffer_append(buf, &ioloop_timeval.tv_usec, sizeof(ioloop_timeval.tv_usec)); randbuf = buffer_append_space_unsafe(buf, MBOX_DELIVERY_ID_RAND_BYTES); random_fill_weak(randbuf, MBOX_DELIVERY_ID_RAND_BYTES); md5_get_digest(buf->data, buf->used, md5_result); str_append(ctx->headers, "X-Delivery-ID: "); ctx->x_delivery_id_pos = str_len(ctx->headers); base64_encode(md5_result, sizeof(md5_result), ctx->headers); str_append_c(ctx->headers, '\n'); t_pop(); } int mbox_save_init(struct mailbox_transaction_context *_t, enum mail_flags flags, struct mail_keywords *keywords, time_t received_date, int timezone_offset ATTR_UNUSED, const char *from_envelope, struct istream *input, struct mail *dest_mail, struct mail_save_context **ctx_r) { struct mbox_transaction_context *t = (struct mbox_transaction_context *)_t; struct mbox_mailbox *mbox = (struct mbox_mailbox *)t->ictx.ibox; struct mbox_save_context *ctx = t->save_ctx; enum mail_flags save_flags; uint64_t offset; i_assert((t->ictx.flags & MAILBOX_TRANSACTION_FLAG_EXTERNAL) != 0); /* FIXME: we could write timezone_offset to From-line.. */ if (received_date == (time_t)-1) received_date = ioloop_time; if (ctx == NULL) { ctx = t->save_ctx = i_new(struct mbox_save_context, 1); ctx->ctx.transaction = &t->ictx.mailbox_ctx; ctx->mbox = mbox; ctx->trans = t->ictx.trans; ctx->append_offset = (uoff_t)-1; ctx->headers = str_new(default_pool, 512); ctx->mail_offset = (uoff_t)-1; } ctx->failed = FALSE; ctx->seq = 0; if (mbox_save_init_file(ctx, t, dest_mail != NULL) < 0) { ctx->failed = TRUE; return -1; } save_flags = (flags & ~MAIL_RECENT) | MAIL_RECENT; str_truncate(ctx->headers, 0); if (ctx->synced) { if (ctx->mbox->mbox_save_md5) ctx->mbox_md5_ctx = mbox_md5_init(); if (ctx->output->offset == 0) { /* writing the first mail. Insert X-IMAPbase as well. */ str_printfa(ctx->headers, "X-IMAPbase: %u %010u\n", ctx->uid_validity, ctx->next_uid); } if ((mbox->storage->storage.flags & MAIL_STORAGE_FLAG_KEEP_HEADER_MD5) != 0) { /* we're using MD5 sums to generate POP3 UIDLs. clients don't like it much if there are duplicates, so make sure that there can't be any by appending our own X-Delivery-ID header. */ mbox_save_x_delivery_id(ctx); } str_printfa(ctx->headers, "X-UID: %u\n", ctx->next_uid); if (!mbox->ibox.keep_recent) save_flags &= ~MAIL_RECENT; mail_index_append(ctx->trans, ctx->next_uid, &ctx->seq); mail_index_update_flags(ctx->trans, ctx->seq, MODIFY_REPLACE, save_flags); if (keywords != NULL) { mail_index_update_keywords(ctx->trans, ctx->seq, MODIFY_REPLACE, keywords); } offset = ctx->output->offset == 0 ? 0 : ctx->output->offset - 1; mail_index_update_ext(ctx->trans, ctx->seq, mbox->mbox_ext_idx, &offset, NULL); ctx->next_uid++; /* parse and cache the mail headers as we read it */ if (dest_mail == NULL) { if (ctx->mail == NULL) ctx->mail = mail_alloc(_t, 0, NULL); dest_mail = ctx->mail; } mail_set_seq(dest_mail, ctx->seq); } mbox_save_append_flag_headers(ctx->headers, save_flags); mbox_save_append_keyword_headers(ctx, keywords); str_append_c(ctx->headers, '\n'); i_assert(mbox->mbox_lock_type == F_WRLCK); ctx->mail_offset = ctx->output->offset; ctx->eoh_offset = (uoff_t)-1; ctx->last_char = '\n'; ctx->received_date = received_date; if (write_from_line(ctx, received_date, from_envelope) < 0) ctx->failed = TRUE; else { ctx->input = i_stream_create_header_filter(input, HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR, mbox_save_drop_headers, mbox_save_drop_headers_count, save_header_callback, ctx); ctx->body_output = (mbox->storage->storage.flags & MAIL_STORAGE_FLAG_SAVE_CRLF) != 0 ? o_stream_create_crlf(ctx->output) : o_stream_create_lf(ctx->output); if (ctx->mail != NULL) { input = index_mail_cache_parse_init(ctx->mail, ctx->input); i_stream_unref(&ctx->input); ctx->input = input; } } *ctx_r = &ctx->ctx; return ctx->failed ? -1 : 0; } int mbox_save_continue(struct mail_save_context *_ctx) { struct mbox_save_context *ctx = (struct mbox_save_context *)_ctx; const unsigned char *data; size_t i, size; ssize_t ret; if (ctx->failed) return -1; if (ctx->eoh_offset != (uoff_t)-1) { /* writing body */ while ((ret = i_stream_read(ctx->input)) != -1) { if (ctx->mail != NULL) { /* i_stream_read() may have returned 0 at EOF because of this parser */ index_mail_cache_parse_continue(ctx->mail); } if (ret == 0) return 0; data = i_stream_get_data(ctx->input, &size); if (o_stream_send(ctx->body_output, data, size) < 0) return write_error(ctx); ctx->last_char = data[size-1]; i_stream_skip(ctx->input, size); } if (ctx->last_char != '\n') { /* if mail doesn't end with LF, we'll do that. otherwise some mbox parsers don't like the result. this makes it impossible to save a mail that doesn't end with LF though. */ if (o_stream_send(ctx->body_output, "\n", 1) < 0) return write_error(ctx); } return 0; } while ((ret = i_stream_read(ctx->input)) != -1) { if (ctx->mail != NULL) index_mail_cache_parse_continue(ctx->mail); if (ret == 0) return 0; data = i_stream_get_data(ctx->input, &size); for (i = 0; i < size; i++) { if (data[i] == '\n' && ((i == 0 && ctx->last_char == '\n') || (i > 0 && data[i-1] == '\n'))) { /* end of headers. we don't need to worry about CRs because they're dropped */ break; } } if (i != size) { /* found end of headers. write the rest of them (not including the finishing empty line) */ if (o_stream_send(ctx->output, data, i) < 0) return write_error(ctx); ctx->last_char = '\n'; i_stream_skip(ctx->input, i + 1); break; } if (o_stream_send(ctx->output, data, size) < 0) return write_error(ctx); ctx->last_char = data[size-1]; i_stream_skip(ctx->input, size); } if (ctx->last_char != '\n') { if (o_stream_send(ctx->output, "\n", 1) < 0) return write_error(ctx); } if (ctx->mbox_md5_ctx) { unsigned char hdr_md5_sum[16]; if (ctx->x_delivery_id_pos != 0) { struct message_header_line hdr; const unsigned char *p; memset(&hdr, 0, sizeof(hdr)); hdr.name = "X-Delivery-ID"; hdr.name_len = strlen(hdr.name); hdr.middle = (const unsigned char *)": "; hdr.middle_len = 2; hdr.value = hdr.full_value = str_data(ctx->headers) + ctx->x_delivery_id_pos; for (p = hdr.value; *p != '\n'; p++) ; hdr.value_len = hdr.full_value_len = p - hdr.value; mbox_md5_continue(ctx->mbox_md5_ctx, &hdr); } mbox_md5_finish(ctx->mbox_md5_ctx, hdr_md5_sum); mail_index_update_ext(ctx->trans, ctx->seq, ctx->mbox->ibox.md5hdr_ext_idx, hdr_md5_sum, NULL); } /* append our own headers and ending empty line */ ctx->extra_hdr_offset = ctx->output->offset; if (o_stream_send(ctx->output, str_data(ctx->headers), str_len(ctx->headers)) < 0) return write_error(ctx); ctx->eoh_offset = ctx->output->offset; /* write body */ (void)i_stream_get_data(ctx->input, &size); return ctx->input->eof && size == 0 ? 0 : mbox_save_continue(_ctx); } int mbox_save_finish(struct mail_save_context *_ctx) { struct mbox_save_context *ctx = (struct mbox_save_context *)_ctx; ctx->finished = TRUE; if (!ctx->failed) { t_push(); if (mbox_write_content_length(ctx) < 0 || mbox_append_lf(ctx) < 0) ctx->failed = TRUE; t_pop(); } if (ctx->mail != NULL) index_mail_cache_parse_deinit(ctx->mail, ctx->received_date); if (ctx->input != NULL) i_stream_destroy(&ctx->input); if (ctx->body_output != NULL) o_stream_destroy(&ctx->body_output); if (ctx->failed && ctx->mail_offset != (uoff_t)-1) { /* saving this mail failed - truncate back to beginning of it */ if (ftruncate(ctx->mbox->mbox_fd, (off_t)ctx->mail_offset) < 0) mbox_set_syscall_error(ctx->mbox, "ftruncate()"); ctx->mail_offset = (uoff_t)-1; } return ctx->failed ? -1 : 0; } void mbox_save_cancel(struct mail_save_context *_ctx) { struct mbox_save_context *ctx = (struct mbox_save_context *)_ctx; ctx->failed = TRUE; (void)mbox_save_finish(_ctx); } static void mbox_transaction_save_deinit(struct mbox_save_context *ctx) { i_assert(ctx->body_output == NULL); if (ctx->output != NULL) o_stream_destroy(&ctx->output); if (ctx->mail != NULL) mail_free(&ctx->mail); str_free(&ctx->headers); i_free(ctx); } int mbox_transaction_save_commit(struct mbox_save_context *ctx) { struct mbox_transaction_context *t = (struct mbox_transaction_context *)ctx->ctx.transaction; struct stat st; int ret = 0; i_assert(ctx->finished); if (fstat(ctx->mbox->mbox_fd, &st) < 0) { mbox_set_syscall_error(ctx->mbox, "fstat()"); ret = -1; } if (ctx->synced) { *t->ictx.saved_uid_validity = ctx->uid_validity; *t->ictx.first_saved_uid = ctx->first_saved_uid; mail_index_update_header(ctx->trans, offsetof(struct mail_index_header, next_uid), &ctx->next_uid, sizeof(ctx->next_uid), FALSE); if (!ctx->mbox->mbox_sync_dirty && ret == 0) { uint32_t sync_stamp = st.st_mtime; uint64_t sync_size = st.st_size; mail_index_update_header(ctx->trans, offsetof(struct mail_index_header, sync_stamp), &sync_stamp, sizeof(sync_stamp), TRUE); mail_index_update_header(ctx->trans, offsetof(struct mail_index_header, sync_size), &sync_size, sizeof(sync_size), TRUE); } *t->ictx.last_saved_uid = ctx->next_uid - 1; } if (ret == 0 && ctx->orig_atime != st.st_atime) { /* try to set atime back to its original value */ struct utimbuf buf; buf.modtime = st.st_mtime; buf.actime = ctx->orig_atime; if (utime(ctx->mbox->path, &buf) < 0) mbox_set_syscall_error(ctx->mbox, "utime()"); } if (!ctx->synced && ctx->mbox->mbox_fd != -1 && !ctx->mbox->mbox_writeonly && !ctx->mbox->ibox.fsync_disable) { if (fdatasync(ctx->mbox->mbox_fd) < 0) { mbox_set_syscall_error(ctx->mbox, "fdatasync()"); ret = -1; } } mbox_transaction_save_deinit(ctx); return ret; } void mbox_transaction_save_rollback(struct mbox_save_context *ctx) { struct mbox_mailbox *mbox = ctx->mbox; if (!ctx->finished) mbox_save_cancel(&ctx->ctx); if (ctx->append_offset != (uoff_t)-1 && mbox->mbox_fd != -1) { i_assert(mbox->mbox_lock_type == F_WRLCK); /* failed, truncate file back to original size. output stream needs to be flushed before truncating so unref() won't write anything. */ o_stream_flush(ctx->output); if (ftruncate(mbox->mbox_fd, (off_t)ctx->append_offset) < 0) mbox_set_syscall_error(mbox, "ftruncate()"); } mbox_transaction_save_deinit(ctx); }