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Diffstat (limited to 'g10/openfile.c')
| -rw-r--r-- | g10/openfile.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/g10/openfile.c b/g10/openfile.c new file mode 100644 index 0000000..6f4e889 --- /dev/null +++ b/g10/openfile.c @@ -0,0 +1,403 @@ +/* openfile.c + * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2009, + * 2010 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * GnuPG is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * GnuPG 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> + +#include "gpg.h" +#include "../common/util.h" +#include "../common/ttyio.h" +#include "options.h" +#include "main.h" +#include "../common/status.h" +#include "../common/i18n.h" + +#ifdef HAVE_W32_SYSTEM +#define NAME_OF_DEV_NULL "nul" +#else +#define NAME_OF_DEV_NULL "/dev/null" +#endif + + +#if defined (HAVE_DRIVE_LETTERS) || defined (__riscos__) +#define CMP_FILENAME(a,b) ascii_strcasecmp( (a), (b) ) +#else +#define CMP_FILENAME(a,b) strcmp( (a), (b) ) +#endif + + +/* FIXME: Implement opt.interactive. */ + +/* + * Check whether FNAME exists and ask if it's okay to overwrite an + * existing one. + * Returns: True: it's okay to overwrite or the file does not exist + * False: Do not overwrite + */ +int +overwrite_filep( const char *fname ) +{ + if ( iobuf_is_pipe_filename (fname) ) + return 1; /* Writing to stdout is always okay. */ + + if ( gnupg_access( fname, F_OK ) ) + return 1; /* Does not exist. */ + + if ( !compare_filenames (fname, NAME_OF_DEV_NULL) ) + return 1; /* Does not do any harm. */ + + if (opt.answer_yes) + return 1; + if (opt.answer_no || opt.batch) + return 0; /* Do not overwrite. */ + + tty_printf (_("File '%s' exists. "), fname); + if (cpr_enabled ()) + tty_printf ("\n"); + if (cpr_get_answer_is_yes ("openfile.overwrite.okay", + _("Overwrite? (y/N) ")) ) + return 1; + return 0; +} + + +/* + * Strip known extensions from iname and return a newly allocated + * filename. Return NULL if we can't do that. + */ +char * +make_outfile_name (const char *iname) +{ + size_t n; + + if (iobuf_is_pipe_filename (iname)) + return xstrdup ("-"); + + n = strlen (iname); + if (n > 4 && (!CMP_FILENAME(iname+n-4, EXTSEP_S GPGEXT_GPG) + || !CMP_FILENAME(iname+n-4, EXTSEP_S "pgp") + || !CMP_FILENAME(iname+n-4, EXTSEP_S "sig") + || !CMP_FILENAME(iname+n-4, EXTSEP_S "asc"))) + { + char *buf = xstrdup (iname); + buf[n-4] = 0; + return buf; + } + else if (n > 5 && !CMP_FILENAME(iname+n-5, EXTSEP_S "sign")) + { + char *buf = xstrdup (iname); + buf[n-5] = 0; + return buf; + } + + log_info (_("%s: unknown suffix\n"), iname); + return NULL; +} + + +/* Ask for an output filename; use the given one as default. Return + NULL if no file has been given or if it is not possible to ask the + user. NAME is the template len which might contain enbedded Nuls. + NAMELEN is its actual length. + */ +char * +ask_outfile_name( const char *name, size_t namelen ) +{ + size_t n; + const char *s; + char *prompt; + char *fname; + char *defname; + + if ( opt.batch ) + return NULL; + + defname = name && namelen? make_printable_string (name, namelen, 0) : NULL; + + s = _("Enter new filename"); + n = strlen(s) + (defname?strlen (defname):0) + 10; + prompt = xmalloc (n); + if (defname) + snprintf (prompt, n, "%s [%s]: ", s, defname ); + else + snprintf (prompt, n, "%s: ", s ); + tty_enable_completion(NULL); + fname = cpr_get ("openfile.askoutname", prompt ); + cpr_kill_prompt (); + tty_disable_completion (); + xfree (prompt); + if ( !*fname ) + { + xfree (fname); + fname = defname; + defname = NULL; + } + xfree (defname); + if (fname) + trim_spaces (fname); + return fname; +} + + +/* + * Make an output filename for the inputfile INAME. + * Returns an IOBUF and an errorcode + * Mode 0 = use ".gpg" + * 1 = use ".asc" + * 2 = use ".sig" + * 3 = use ".rev" + * + * If INP_FD is not -1 the function simply creates an IOBUF for that + * file descriptor and ignore INAME and MODE. Note that INP_FD won't + * be closed if the returned IOBUF is closed. With RESTRICTEDPERM a + * file will be created with mode 700 if possible. + */ +int +open_outfile (int inp_fd, const char *iname, int mode, int restrictedperm, + iobuf_t *a) +{ + int rc = 0; + + *a = NULL; + if (inp_fd != -1) + { + char xname[64]; + + *a = iobuf_fdopen_nc (inp_fd, "wb"); + if (!*a) + { + rc = gpg_error_from_syserror (); + snprintf (xname, sizeof xname, "[fd %d]", inp_fd); + log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (rc)); + } + else if (opt.verbose) + { + snprintf (xname, sizeof xname, "[fd %d]", inp_fd); + log_info (_("writing to '%s'\n"), xname); + } + } + else if (iobuf_is_pipe_filename (iname) && !opt.outfile) + { + *a = iobuf_create (NULL, 0); + if ( !*a ) + { + rc = gpg_error_from_syserror (); + log_error (_("can't open '%s': %s\n"), "[stdout]", strerror(errno) ); + } + else if ( opt.verbose ) + log_info (_("writing to stdout\n")); + } + else + { + char *buf = NULL; + const char *name; + + if (opt.dry_run) + name = NAME_OF_DEV_NULL; + else if (opt.outfile) + name = opt.outfile; + else + { +#ifdef USE_ONLY_8DOT3 + if (opt.mangle_dos_filenames) + { + /* It is quite common for DOS systems to have only one + dot in a filename. If we have something like this, + we simple replace the suffix except in cases where + the suffix is larger than 3 characters and not the + same as the new one. We don't map the filenames to + 8.3 because this is a duty of the file system. */ + char *dot; + const char *newsfx; + + newsfx = (mode==1 ? ".asc" : + mode==2 ? ".sig" : + mode==3 ? ".rev" : ".gpg"); + + buf = xmalloc (strlen(iname)+4+1); + strcpy (buf, iname); + dot = strchr (buf, '.' ); + if ( dot && dot > buf && dot[1] && strlen(dot) <= 4 + && CMP_FILENAME (newsfx, dot) ) + strcpy (dot, newsfx); + else if (dot && !dot[1]) /* Do not duplicate a dot. */ + strcpy (dot, newsfx+1); + else + strcat (buf, newsfx); + } + if (!buf) +#endif /* USE_ONLY_8DOT3 */ + { + buf = xstrconcat (iname, + (mode==1 ? EXTSEP_S "asc" : + mode==2 ? EXTSEP_S "sig" : + mode==3 ? EXTSEP_S "rev" : + /* */ EXTSEP_S GPGEXT_GPG), + NULL); + } + name = buf; + } + + rc = 0; + while ( !overwrite_filep (name) ) + { + char *tmp = ask_outfile_name (NULL, 0); + if ( !tmp || !*tmp ) + { + xfree (tmp); + rc = gpg_error (GPG_ERR_EEXIST); + break; + } + xfree (buf); + name = buf = tmp; + } + + if ( !rc ) + { + if (is_secured_filename (name) ) + { + *a = NULL; + gpg_err_set_errno (EPERM); + } + else + *a = iobuf_create (name, restrictedperm); + if (!*a) + { + rc = gpg_error_from_syserror (); + log_error(_("can't create '%s': %s\n"), name, strerror(errno) ); + } + else if( opt.verbose ) + log_info (_("writing to '%s'\n"), name ); + } + xfree(buf); + } + + if (*a) + iobuf_ioctl (*a, IOBUF_IOCTL_NO_CACHE, 1, NULL); + + return rc; +} + + +/* Find a matching data file for the signature file SIGFILENAME and + return it as a malloced string. If no matching data file is found, + return NULL. */ +char * +get_matching_datafile (const char *sigfilename) +{ + char *fname = NULL; + size_t len; + + if (iobuf_is_pipe_filename (sigfilename)) + return NULL; + + len = strlen (sigfilename); + if (len > 4 + && (!strcmp (sigfilename + len - 4, EXTSEP_S "sig") + || (len > 5 && !strcmp(sigfilename + len - 5, EXTSEP_S "sign")) + || !strcmp(sigfilename + len - 4, EXTSEP_S "asc"))) + { + + fname = xstrdup (sigfilename); + fname[len-(fname[len-1]=='n'?5:4)] = 0 ; + if (gnupg_access (fname, R_OK )) + { + /* Not found or other error. */ + xfree (fname); + fname = NULL; + } + } + + return fname; +} + + +/* + * Try to open a file without the extension ".sig" or ".asc" + * Return NULL if such a file is not available. + */ +iobuf_t +open_sigfile (const char *sigfilename, progress_filter_context_t *pfx) +{ + iobuf_t a = NULL; + char *buf; + + buf = get_matching_datafile (sigfilename); + if (buf) + { + a = iobuf_open (buf); + if (a && is_secured_file (iobuf_get_fd (a))) + { + iobuf_close (a); + a = NULL; + gpg_err_set_errno (EPERM); + } + if (a) + log_info (_("assuming signed data in '%s'\n"), buf); + if (a && pfx) + handle_progress (pfx, a, buf); + xfree (buf); + } + + return a; +} + + +/* Create the directory only if the supplied directory name is the + same as the default one. This way we avoid to create arbitrary + directories when a non-default home directory is used. To cope + with HOME, we do compare only the suffix if we see that the default + homedir does start with a tilde. */ +void +try_make_homedir (const char *fname) +{ + if ( opt.dry_run || opt.no_homedir_creation ) + return; + + gnupg_maybe_make_homedir (fname, opt.quiet); +} + + +/* Get and if needed create a string with the directory used to store + openpgp revocations. */ +char * +get_openpgp_revocdir (const char *home) +{ + char *fname; + struct stat statbuf; + + fname = make_filename (home, GNUPG_OPENPGP_REVOC_DIR, NULL); + if (gnupg_stat (fname, &statbuf) && errno == ENOENT) + { + if (gnupg_mkdir (fname, "-rwx")) + log_error (_("can't create directory '%s': %s\n"), + fname, strerror (errno) ); + else if (!opt.quiet) + log_info (_("directory '%s' created\n"), fname); + } + return fname; +} |