/* vfs-mount.c - vfs mount support in GPGME Copyright (C) 2009 g10 Code GmbH This file is part of GPGME. GPGME is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. GPGME 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #if HAVE_CONFIG_H #include #endif #include #include "gpgme.h" #include "debug.h" #include "context.h" #include "ops.h" #include "util.h" typedef struct { struct _gpgme_op_vfs_mount_result result; } *op_data_t; gpgme_vfs_mount_result_t gpgme_op_vfs_mount_result (gpgme_ctx_t ctx) { gpgme_error_t err; void *hook; op_data_t opd; err = _gpgme_op_data_lookup (ctx, OPDATA_VFS_MOUNT, &hook, -1, NULL); opd = hook; /* Check in case this function is used without having run a command before. */ if (err || !opd) return NULL; return &opd->result; } static gpgme_error_t _gpgme_vfs_mount_status_handler (void *priv, const char *code, const char *args) { gpgme_ctx_t ctx = (gpgme_ctx_t) priv; gpgme_error_t err; void *hook; op_data_t opd; err = _gpgme_op_data_lookup (ctx, OPDATA_VFS_MOUNT, &hook, -1, NULL); opd = hook; if (err) return err; if (! strcasecmp ("MOUNTPOINT", code)) { if (opd->result.mount_dir) free (opd->result.mount_dir); opd->result.mount_dir = strdup (args); } return 0; } static gpgme_error_t vfs_start (gpgme_ctx_t ctx, int synchronous, const char *command, gpgme_assuan_data_cb_t data_cb, void *data_cb_value, gpgme_assuan_inquire_cb_t inq_cb, void *inq_cb_value, gpgme_assuan_status_cb_t status_cb, void *status_cb_value) { gpgme_error_t err; void *hook; op_data_t opd; if (!command || !*command) return gpg_error (GPG_ERR_INV_VALUE); /* The flag value 256 is used to suppress an engine reset. This is required to keep the connection running. */ err = _gpgme_op_reset (ctx, ((synchronous & 255) | 256)); if (err) return err; err = _gpgme_op_data_lookup (ctx, OPDATA_VFS_MOUNT, &hook, sizeof (*opd), NULL); opd = hook; if (err) return err; return _gpgme_engine_op_assuan_transact (ctx->engine, command, data_cb, data_cb_value, inq_cb, inq_cb_value, status_cb, status_cb_value); } #if 0 /* XXXX. This is the asynchronous variant. */ static gpgme_error_t gpgme_op_vfs_transact_start (gpgme_ctx_t ctx, const char *command, gpgme_assuan_data_cb_t data_cb, void *data_cb_value, gpgme_assuan_inquire_cb_t inq_cb, void *inq_cb_value, gpgme_assuan_status_cb_t status_cb, void *status_cb_value) { return vfs_start (ctx, 0, command, data_cb, data_cb_value, inq_cb, inq_cb_value, status_cb, status_cb_value); } #endif /* XXXX. This is the synchronous variant. */ static gpgme_error_t gpgme_op_vfs_transact (gpgme_ctx_t ctx, const char *command, gpgme_assuan_data_cb_t data_cb, void *data_cb_value, gpgme_assuan_inquire_cb_t inq_cb, void *inq_cb_value, gpgme_assuan_status_cb_t status_cb, void *status_cb_value, gpgme_error_t *op_err) { gpgme_error_t err; if (!ctx) return gpg_error (GPG_ERR_INV_VALUE); err = vfs_start (ctx, 1, command, data_cb, data_cb_value, inq_cb, inq_cb_value, status_cb, status_cb_value); if (!err) err = _gpgme_wait_one_ext (ctx, op_err); return err; } /* The actual exported interface follows. */ /* The container is automatically unmounted when the context is reset or destroyed. This is a synchronous convenience interface, which automatically returns an operation error if there is no transmission error. */ static gpgme_error_t _gpgme_op_vfs_mount (gpgme_ctx_t ctx, const char *container_file, const char *mount_dir, int flags, gpgme_error_t *op_err) { gpg_error_t err; char *cmd; char *container_file_esc = NULL; /* We want to encourage people to check error values, so not getting them is discouraged here. Also makes our code easier. */ if (! op_err) return gpg_error (GPG_ERR_INV_VALUE); err = _gpgme_encode_percent_string (container_file, &container_file_esc, 0); if (err) return err; if (asprintf (&cmd, "OPEN -- %s", container_file_esc) < 0) { err = gpg_error_from_syserror (); free (container_file_esc); return err; } free (container_file_esc); err = gpgme_op_vfs_transact (ctx, cmd, NULL, NULL, NULL, NULL, NULL, NULL, op_err); free (cmd); if (err || *op_err) return err; if (mount_dir) { char *mount_dir_esc = NULL; err = _gpgme_encode_percent_string (mount_dir, &mount_dir_esc, 0); if (err) return err; if (asprintf (&cmd, "MOUNT -- %s", mount_dir_esc) < 0) { err = gpg_error_from_syserror (); free (mount_dir_esc); return err; } free (mount_dir_esc); } else { if (asprintf (&cmd, "MOUNT") < 0) return gpg_error_from_syserror (); } err = gpgme_op_vfs_transact (ctx, cmd, NULL, NULL, NULL, NULL, _gpgme_vfs_mount_status_handler, ctx, op_err); free (cmd); return err; } gpgme_error_t gpgme_op_vfs_mount (gpgme_ctx_t ctx, const char *container_file, const char *mount_dir, unsigned int flags, gpgme_error_t *op_err) { gpg_error_t err; TRACE_BEG4 (DEBUG_CTX, "gpgme_op_vfs_mount", ctx, "container=%s, mount_dir=%s, flags=0x%x, op_err=%p", container_file, mount_dir, flags, op_err); if (!ctx) return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE)); err = _gpgme_op_vfs_mount (ctx, container_file, mount_dir, flags, op_err); return TRACE_ERR (err); }