src/lib-lda/mail-deliver.c

	mail-deliver.c revision 4c20874a726f2a88e133a7fb1fb07ea66a0b5a7c
/* Copyright (c) 2005-2010 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "ioloop.h"
#include "array.h"
#include "str.h"
#include "str-sanitize.h"
#include "var-expand.h"
#include "message-address.h"
#include "imap-utf7.h"
#include "lda-settings.h"
#include "mail-storage.h"
#include "mail-namespace.h"
#include "duplicate.h"
#include "mail-deliver.h"

deliver_mail_func_t *deliver_mail = NULL;

const char *mail_deliver_get_address(struct mail *mail, const char *header)
{
    struct message_address *addr;
    const char *str;

    if (mail_get_first_header(mail, header, &str) <= 0)
        return NULL;
    addr = message_address_parse(pool_datastack_create(),
                     (const unsigned char *)str,
                     strlen(str), 1, FALSE);
    return addr == NULL || addr->mailbox == NULL || addr->domain == NULL ||
        *addr->mailbox == '\0' || *addr->domain == '\0' ?
        NULL : t_strconcat(addr->mailbox, "@", addr->domain, NULL);
}

const struct var_expand_table *
mail_deliver_get_log_var_expand_table(struct mail *mail, const char *message)
{
    static struct var_expand_table static_tab[] = {
        { '$', NULL, NULL },
        { 'm', NULL, "msgid" },
        { 's', NULL, "subject" },
        { 'f', NULL, "from" },
        { 'p', NULL, "size" },
        { 'w', NULL, "vsize" },
        { '\0', NULL, NULL }
    };
    struct var_expand_table *tab;
    uoff_t size;

    tab = t_malloc(sizeof(static_tab));
    memcpy(tab, static_tab, sizeof(static_tab));

    tab[0].value = message;
    (void)mail_get_first_header(mail, "Message-ID", &tab[1].value);
    tab[1].value = tab[1].value == NULL ? "unspecified" :
        str_sanitize(tab[1].value, 200);

    (void)mail_get_first_header_utf8(mail, "Subject", &tab[2].value);
    tab[2].value = str_sanitize(tab[2].value, 80);
    tab[3].value = str_sanitize(mail_deliver_get_address(mail, "From"), 80);

    if (mail_get_physical_size(mail, &size) == 0)
        tab[4].value = dec2str(size);
    if (mail_get_virtual_size(mail, &size) == 0)
        tab[5].value = dec2str(size);
    return tab;
}

void mail_deliver_log(struct mail_deliver_context *ctx, const char *fmt, ...)
{
    va_list args;
    string_t *str;
    const char *msg;

    va_start(args, fmt);
    msg = t_strdup_vprintf(fmt, args);

    str = t_str_new(256);
    if (ctx->session_id != NULL)
        str_printfa(str, "%s: ", ctx->session_id);
    var_expand(str, ctx->set->deliver_log_format,
           mail_deliver_get_log_var_expand_table(ctx->src_mail, msg));
    i_info("%s", str_c(str));
    va_end(args);
}

static const char *mailbox_name_to_mutf7(const char *mailbox_utf8)
{
    string_t *str = t_str_new(128);

    if (imap_utf8_to_utf7(mailbox_utf8, str) < 0)
        return mailbox_utf8;
    else
        return str_c(str);
}

int mail_deliver_save_open(struct mail_deliver_save_open_context *ctx,
               const char *name, struct mailbox **box_r,
               const char **error_r)
{
    struct mail_namespace *ns;
    struct mail_storage *storage;
    struct mailbox *box;
    enum mail_error error;
    enum mailbox_flags flags =
        MAILBOX_FLAG_KEEP_RECENT | MAILBOX_FLAG_SAVEONLY |
        MAILBOX_FLAG_POST_SESSION;

    *box_r = NULL;
    *error_r = NULL;

    name = mailbox_name_to_mutf7(name);
    ns = mail_namespace_find(ctx->user->namespaces, &name);
    if (ns == NULL) {
        *error_r = "Unknown namespace";
        return -1;
    }

    if (*name == '\0' && (ns->flags & NAMESPACE_FLAG_INBOX_USER) != 0) {
        /* delivering to a namespace prefix means we actually want to
           deliver to the INBOX instead */
        name = "INBOX";
        ns = mail_namespace_find_inbox(ctx->user->namespaces);
    }

    if (strcasecmp(name, "INBOX") == 0) {
        /* deliveries to INBOX must always succeed,
           regardless of ACLs */
        flags |= MAILBOX_FLAG_IGNORE_ACLS;
    }

    *box_r = box = mailbox_alloc(ns->list, name, flags);
    if (mailbox_open(box) == 0)
        return 0;

    storage = mailbox_get_storage(box);
    *error_r = mail_storage_get_last_error(storage, &error);
    if (!ctx->lda_mailbox_autocreate || error != MAIL_ERROR_NOTFOUND)
        return -1;

    /* try creating it. */
    if (mailbox_create(box, NULL, FALSE) < 0) {
        *error_r = mail_storage_get_last_error(storage, &error);
        if (error != MAIL_ERROR_EXISTS)
            return -1;
        /* someone else just created it */
    }
    if (ctx->lda_mailbox_autosubscribe) {
        /* (try to) subscribe to it */
        (void)mailbox_list_set_subscribed(ns->list, name, TRUE);
    }

    /* and try opening again */
    if (mailbox_sync(box, 0) < 0) {
        *error_r = mail_storage_get_last_error(storage, &error);
        return -1;
    }
    return 0;
}

int mail_deliver_save(struct mail_deliver_context *ctx, const char *mailbox,
              enum mail_flags flags, const char *const *keywords,
              struct mail_storage **storage_r)
{
    struct mail_deliver_save_open_context open_ctx;
    struct mailbox *box;
    enum mailbox_transaction_flags trans_flags;
    struct mailbox_transaction_context *t;
    struct mail_save_context *save_ctx;
    struct mail_keywords *kw;
    enum mail_error error;
    const char *mailbox_name, *errstr;
    struct mail_transaction_commit_changes changes;
    const struct seq_range *range;
    bool default_save;
    int ret = 0;

    i_assert(ctx->dest_mail == NULL);

    default_save = strcmp(mailbox, ctx->dest_mailbox_name) == 0;
    if (default_save)
        ctx->tried_default_save = TRUE;

    memset(&open_ctx, 0, sizeof(open_ctx));
    open_ctx.user = ctx->dest_user;
    open_ctx.lda_mailbox_autocreate = ctx->set->lda_mailbox_autocreate;
    open_ctx.lda_mailbox_autosubscribe = ctx->set->lda_mailbox_autosubscribe;

    mailbox_name = str_sanitize(mailbox, 80);
    if (mail_deliver_save_open(&open_ctx, mailbox, &box, &errstr) < 0) {
        if (box != NULL)
            mailbox_free(&box);
        mail_deliver_log(ctx, "save failed to %s: %s",
                 mailbox_name, errstr);
        return -1;
    }
    *storage_r = mailbox_get_storage(box);

    trans_flags = MAILBOX_TRANSACTION_FLAG_EXTERNAL;
    if (ctx->save_dest_mail)
        trans_flags |= MAILBOX_TRANSACTION_FLAG_ASSIGN_UIDS;
    t = mailbox_transaction_begin(box, trans_flags);

    kw = str_array_length(keywords) == 0 ? NULL :
        mailbox_keywords_create_valid(box, keywords);
    save_ctx = mailbox_save_alloc(t);
    if (ctx->src_envelope_sender != NULL)
        mailbox_save_set_from_envelope(save_ctx, ctx->src_envelope_sender);
    mailbox_save_set_flags(save_ctx, flags, kw);
    if (mailbox_copy(&save_ctx, ctx->src_mail) < 0)
        ret = -1;
    if (kw != NULL)
        mailbox_keywords_unref(box, &kw);

    if (ret < 0)
        mailbox_transaction_rollback(&t);
    else
        ret = mailbox_transaction_commit_get_changes(&t, &changes);

    if (ret == 0) {
        ctx->saved_mail = TRUE;
        mail_deliver_log(ctx, "saved mail to %s", mailbox_name);

        if (ctx->save_dest_mail && mailbox_sync(box, 0) == 0) {
            range = array_idx(&changes.saved_uids, 0);
            i_assert(range[0].seq1 == range[0].seq2);

            t = mailbox_transaction_begin(box, 0);
            ctx->dest_mail = mail_alloc(t, MAIL_FETCH_STREAM_BODY,
                            NULL);
            if (mail_set_uid(ctx->dest_mail, range[0].seq1) < 0) {
                mail_free(&ctx->dest_mail);
                mailbox_transaction_rollback(&t);
            }
        }
        pool_unref(&changes.pool);
    } else {
        mail_deliver_log(ctx, "save failed to %s: %s", mailbox_name,
            mail_storage_get_last_error(*storage_r, &error));
    }

    if (ctx->dest_mail == NULL)
        mailbox_free(&box);
    return ret;
}

const char *mail_deliver_get_return_address(struct mail_deliver_context *ctx)
{
    if (ctx->src_envelope_sender != NULL)
        return ctx->src_envelope_sender;

    return mail_deliver_get_address(ctx->src_mail, "Return-Path");
}

const char *mail_deliver_get_new_message_id(struct mail_deliver_context *ctx)
{
    static int count = 0;

    return t_strdup_printf("<dovecot-%s-%s-%d@%s>",
                   dec2str(ioloop_timeval.tv_sec),
                   dec2str(ioloop_timeval.tv_usec),
                   count++, ctx->set->hostname);
}

int mail_deliver(struct mail_deliver_context *ctx,
         struct mail_storage **storage_r)
{
    int ret;

    *storage_r = NULL;
    if (deliver_mail == NULL)
        ret = -1;
    else {
        ctx->dup_ctx = duplicate_init(ctx->dest_user);
        if (deliver_mail(ctx, storage_r) <= 0) {
            /* if message was saved, don't bounce it even though
               the script failed later. */
            ret = ctx->saved_mail ? 0 : -1;
        } else {
            /* success. message may or may not have been saved. */
            ret = 0;
        }
        duplicate_deinit(&ctx->dup_ctx);
    }

    if (ret < 0 && !ctx->tried_default_save) {
        /* plugins didn't handle this. save into the default mailbox. */
        ret = mail_deliver_save(ctx, ctx->dest_mailbox_name, 0, NULL,
                    storage_r);
    }
    if (ret < 0 && strcasecmp(ctx->dest_mailbox_name, "INBOX") != 0) {
        /* still didn't work. try once more to save it
           to INBOX. */
        ret = mail_deliver_save(ctx, "INBOX", 0, NULL, storage_r);
    }
    return ret;
}