src/client/fuse/main.c

   1 /* $Id$
   2  * client FUSE interface for libcaptive
   3  * Copyright (C) 2005 Jan Kratochvil <project-captive@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include <fuse.h>
  23 #include <popt.h>
  24 #include <locale.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <syslog.h>
  28
  29 #include <captive/client-vfs.h>
  30 #include <captive/macros.h>
  31 #include <captive/client.h>
  32 #include <captive/captivemodid.h>
  33
  34 #include "main.h"       /* self */
  35 #include "op_statfs.h"
  36 #include "op_fsync.h"
  37 #include "op_fsyncdir.h"
  38 #include "op_opendir.h"
  39 #include "op_readdir.h"
  40 #include "op_releasedir.h"
  41 #include "op_open.h"
  42 #include "op_read.h"
  43 #include "op_release.h"
  44 #include "op_getattr.h"
  45 #include "op_mknod.h"
  46 #include "op_unlink.h"
  47 #include "op_mkdir.h"
  48 #include "op_rmdir.h"
  49 #include "op_chmod.h"
  50 #include "op_truncate.h"
  51 #include "op_write.h"
  52 #include "op_rename.h"
  53 #include "op_utime.h"
  54
  55
  56 /* Config: */
  57 /* FIXME: Dupe with libcaptive/client/options.c */
  58 #define DEFAULT_SYSLOG_FACILITY LOG_DAEMON
  59 /* Each element must be preceded by a comma (',')! */
  60 #define LIBFUSE_ADDONS ",default_permissions,allow_other,kernel_cache"
  61
  62
  63 CaptiveVfsObject *capfuse_captive_vfs_object;
  64
  65 static const struct poptOption popt_table[]={
  66         CAPTIVE_POPT_INCLUDE,
  67         POPT_AUTOHELP
  68         POPT_TABLEEND
  69         };
  70
  71 static const struct fuse_operations capfuse_operations={
  72         statfs:     op_statfs,
  73         fsync:      op_fsync,
  74         fsyncdir:   op_fsyncdir,
  75         opendir:    op_opendir,
  76         readdir:    op_readdir,
  77         releasedir: op_releasedir,
  78         open:       op_open,
  79         read:       op_read,
  80         release:    op_release,
  81         getattr:    op_getattr,
  82         mknod:      op_mknod,
  83         unlink:     op_unlink,
  84         mkdir:      op_mkdir,
  85         rmdir:      op_rmdir,
  86         chmod:      op_chmod,
  87         truncate:   op_truncate,
  88         write:      op_write,
  89         rename:     op_rename,
  90         utime:      op_utime,
  91         };
  92
  93 /* argv[0] expected as the program name. */
  94 /* Only options and mountpoint expected here. */
  95 static void capfuse_run(int argc,const char **argv)
  96 {
  97 char *capfuse_mountpoint;
  98 int capfuse_multithreaded,capfuse_fd;
  99 struct fuse *capfuse_fuse;
 100
 101         if (!(capfuse_fuse=fuse_setup(
 102                                 argc,   /* argc */
 103                                 (/*de-const; broken fuset_setup()*/char **)argv,        /* argv */
 104                                 &capfuse_operations,    /* op */
 105                                 sizeof(capfuse_operations),     /* op_size */
 106                         &capfuse_mountpoint,    /* mountpoint */
 107                         &capfuse_multithreaded, /* multithreaded */
 108                         &capfuse_fd)))  /* fd */
 109                 g_error(_(
 110                                 "FUSE fuse_setup() failed!\n"
 111                                 "You may need Linux kernel 2.6.14 or higher with its 'fuse.ko' enabled.\n"
 112                                 "You may also need to install or upgrade 'fuse' package to your system."));
 113         if (fuse_loop(capfuse_fuse)) {
 114                 /* Do not: g_error(_("FUSE fuse_loop() error"));
 115                  * as it is caused on each umount(8).
 116                  * FIXME: Why?
 117                  */
 118                 }
 119         fuse_teardown(capfuse_fuse,capfuse_fd,capfuse_mountpoint);
 120 }
 121
 122 int main(int argc,char **argv)
 123 {
 124 poptContext context=NULL;       /* Valid if: opt_o; '= NULL' to shut up GCC. */
 125 int rest_argc;
 126 const char **rest_argv,**csp;
 127 struct captive_options options;
 128 int capfuse_argc;
 129 const char **capfuse_argv;
 130 const char *program_name=argv[0];
 131 const char *sandbox_server_argv0=G_STRINGIFY(LIBEXECDIR) "/captive-sandbox-server";
 132 const char *image_filename=NULL;
 133 gboolean opt_n=FALSE;
 134 gboolean opt_v=FALSE;
 135 const char *opt_o=NULL;
 136 const char *mountpoint=NULL;
 137 char **argv_sp;
 138 int opt_o_argc; /* Valid if: opt_o */
 139 const char **opt_o_argv=NULL;   /* Valid if: opt_o */
 140
 141 #if 0
 142 {
 143 char **sp;
 144         for (sp=argv;*sp;sp++)
 145                 fprintf(stderr,"argv: \"%s\"\n",*sp);
 146 }
 147 #endif
 148
 149         /* Do not set g_log_set_always_fatal() here as we would not be able
 150          * to restart failed children due to communication-failure alarms.
 151          */
 152
 153         captive_standalone_init();
 154
 155         /* poptGetNextOpt() below requires valid: captive_options */
 156         captive_options_init(&options);
 157         captive_options=&options;       /* for parsing by 'CAPTIVE_POPT_INCLUDE' */
 158
 159         argv_sp=argv+1;
 160         if (*argv_sp && (*argv_sp)[0]!='-')
 161                 image_filename=*argv_sp++;
 162         if (*argv_sp && (*argv_sp)[0]!='-')
 163                 mountpoint=*argv_sp++;
 164         if (*argv_sp && !strcmp(*argv_sp,"-n")) {
 165                 opt_n=TRUE;
 166                 argv_sp++;
 167                 }
 168         if (*argv_sp && !strcmp(*argv_sp,"-v")) {
 169                 opt_v=TRUE;
 170                 argv_sp++;
 171                 }
 172         if (argv_sp[0] && argv_sp[1] && !strcmp(argv_sp[0],"-o")) {
 173                 argv_sp++;
 174                 opt_o=*argv_sp++;
 175                 }
 176         if (*argv_sp) {
 177                 /* Lethal path but still give chance for "--help" etc. */
 178                 /* Do not: POPT_CONTEXT_POSIXMEHARDER
 179                  * as mount(8) puts there first un-pre-dashed "ro"/"rw" etc. */
 180                 /* poptGetNextOpt() requires valid: captive_options */
 181                 if ((context=poptGetContext(
 182                                 PACKAGE,        /* name */
 183                                 argc,(/*en-const*/const char **)argv,   /* argc,argv */
 184                                 popt_table,     /* options */
 185                                 0)))    /* flags; && !POPT_CONTEXT_KEEP_FIRST */
 186                         while (0<=poptGetNextOpt(context));
 187                 g_error(_("Excessive argument: %s"),*argv_sp);
 188                 }
 189
 190         if (opt_o) {
 191 char *opt_o_spaced=(char */* de-const; length is not changed */)captive_strdup_alloca(opt_o);
 192 char *s,quote;
 193
 194                 quote=0;
 195                 for (s=opt_o_spaced;*s;s++) {
 196                         /* Be compatible with: poptParseArgvString()
 197                          * which also does not differentiate '"' and "'" */
 198                         if (*s=='\\' && s[1]) {
 199                                 s++;
 200                                 continue;
 201                                 }
 202                         if (quote) {
 203                                 if (*s==quote)
 204                                         quote=0;
 205                                 continue;
 206                                 }
 207                         switch (*s) {
 208                                 case '"':
 209                                 case '\'':
 210                                         quote=*s;
 211                                         continue;
 212                                 case ',':
 213                                         *s=' ';
 214                                         continue;
 215                                 }
 216                         }
 217                 if (poptParseArgvString(opt_o_spaced,&opt_o_argc,&opt_o_argv))
 218                         g_error(_("Error splitting arguments of the space-reparsed '-o': %s"),opt_o_spaced);
 219                 /* Adjust the options for all the subsystems eating the same string vector. */
 220                 for (csp=opt_o_argv;*csp;csp++) {
 221                         /* Unsupported mount(8) options not valid for fusermount(8) and causing:
 222                          *      fusermount: mount failed: Invalid argument */
 223                         if (0
 224                                         || !strcmp(*csp,"defaults")
 225                                         || !strcmp(*csp,  "auto")
 226                                         || !strcmp(*csp,"noauto")) {
 227                                 memmove(csp,csp+1,(opt_o_argv+opt_o_argc+1-(csp+1))*sizeof(*csp));
 228                                 opt_o_argc--;
 229                                 csp--;
 230                                 continue;
 231                                 }
 232                         /* Pre-dash "ro"/"rw" to let libcaptive to be aware of the mode.
 233                          * We will put the final "ro"/"rw" there again from 'captive_options.rwmode' later. */
 234                         if (!strcmp(*csp,"ro"))
 235                                 *csp="--ro";
 236                         if (!strcmp(*csp,"rw"))
 237                                 *csp="--rw";
 238                         /* LUFS "uid" and "gid" options should map to FUSE well, I hope. */
 239 #define STRNCMP_CONST(mem,string) strncmp((mem),(string),strlen((string)))
 240                         if (0
 241                                         || !STRNCMP_CONST(*csp,"fmask=")
 242                                         || !STRNCMP_CONST(*csp,"dmask=")
 243                                         || !STRNCMP_CONST(*csp,"channels=")
 244                                         || !STRNCMP_CONST(*csp,"root=")
 245                                         || !strcmp(*csp,"own_fs")
 246                                         || !strcmp(*csp,"quiet")
 247                                         || !STRNCMP_CONST(*csp,"dir_cache_ttl=")
 248                                         )
 249                                 g_error(_("Seen obsolete LUFS option \"%s\" - please update your \"/etc/fstab\" for FUSE options instead"),
 250                                                 *csp);
 251 #undef STRNCMP_CONST
 252                         }
 253                 }
 254
 255         g_assert(!options.sandbox_server_argv);
 256         g_assert(!options.sandbox_server_ior);
 257         /* captive_options_free(&options) will: g_free(options.sandbox_server_argv); */
 258         /* Allocation is so terrible to be compatible with: captive_options_copy() */
 259         options.sandbox_server_argv=g_malloc(2*sizeof(*options.sandbox_server_argv)+strlen(sandbox_server_argv0)+1);
 260         options.sandbox_server_argv[0]=(char *)(options.sandbox_server_argv+2);
 261         options.sandbox_server_argv[1]=NULL;
 262         strcpy(options.sandbox_server_argv[0],sandbox_server_argv0);
 263         options.sandbox=TRUE;
 264
 265         g_assert(!options.bug_pathname);
 266         options.bug_pathname=g_strdup(G_STRINGIFY(VARLIBCAPTIVEDIR) "/bug-%FT%T.captivebug.xml.gz");
 267
 268         options.syslog_facility=DEFAULT_SYSLOG_FACILITY;
 269
 270         if (opt_o) {
 271                 /* Do not: POPT_CONTEXT_POSIXMEHARDER
 272                  * as mount(8) puts there first un-pre-dashed "ro"/"rw" etc. */
 273                 if (!(context=poptGetContext(
 274                                 PACKAGE,        /* name */
 275                                 opt_o_argc,opt_o_argv,  /* argc,argv */
 276                                 popt_table,     /* options */
 277                                 POPT_CONTEXT_KEEP_FIRST)))      /* flags */
 278                         g_error(_("Error parsing command-line arguments from pre-parsed '-o': %s"),opt_o);
 279                 if (poptReadDefaultConfig(context,
 280                                 TRUE))  /* useEnv */
 281                         g_warning(_("Error reading default popt configuration"));
 282                 while (0<=poptGetNextOpt(context));
 283                 rest_argv=poptGetArgs(context);
 284                 }
 285         else
 286                 rest_argv=NULL;
 287         rest_argc=0;
 288         for (csp=rest_argv;csp && *csp;csp++)
 289                 rest_argc++;
 290
 291         if (!image_filename || !mountpoint)
 292                 g_error(_("File/device disk image pathname and mountpoint command-line arguments required"));
 293
 294         /* image_iochannel */
 295         g_assert(options.image_iochannel==NULL);
 296         if (!(options.image_iochannel=g_io_channel_new_file(
 297                         image_filename, /* filename */
 298                         (options.rwmode==CAPTIVE_OPTION_RWMODE_RW ? "r+" : "r"),        /* mode */
 299                         NULL))) {       /* error */
 300                 g_error(_("image_iochannel failed open of: %s"),image_filename);
 301                 return EXIT_FAILURE;
 302                 }
 303
 304         if (!options.captivemodid)
 305                 options.captivemodid=captive_captivemodid_load_default(FALSE);
 306
 307         if (options.filesystem.type==CAPTIVE_OPTIONS_MODULE_TYPE_EMPTY) {
 308 const char *self_prefix="mount.captive-";
 309 size_t self_prefix_len=strlen(self_prefix);
 310 const char *fsname;
 311
 312                 if ((fsname=strrchr(program_name,'/')))
 313                         fsname++;
 314                 else
 315                         fsname=program_name;
 316                 if (strncmp(fsname,self_prefix,self_prefix_len))
 317                         g_error(_("Cannot detected default filesystem name from my basename: %s"),fsname);
 318                 fsname+=self_prefix_len;
 319                 if (!captive_options_module_load(&options.filesystem,
 320                                 captive_printf_alloca("%s/%s.sys",G_STRINGIFY(VARLIBCAPTIVEDIR),fsname)))
 321                         g_error(_("'--filesystem' option requires valid pathname ('ntfs.sys' suggested)"));
 322                 g_assert(options.filesystem.type!=CAPTIVE_OPTIONS_MODULE_TYPE_EMPTY);
 323                 }
 324         if (!options.load_module) {
 325 struct captive_options_module *options_module;
 326
 327                 captive_new(options_module);
 328                 if (!captive_options_module_load(options_module,G_STRINGIFY(VARLIBCAPTIVEDIR) "/ntoskrnl.exe"))
 329                         g_error(_("'--load-module' option requires valid pathname ('ntoskrnl.exe' suggested)"));
 330
 331                 options.load_module=g_list_append(options.load_module,options_module);
 332                 }
 333
 334         /* It is still required for: captive_options_module_load() */
 335         captive_options=NULL;   /* already parsed by 'CAPTIVE_POPT_INCLUDE' */
 336
 337         if (GNOME_VFS_OK!=captive_vfs_new(&capfuse_captive_vfs_object,&options)) {
 338                 g_error(_("captive_vfs_new() failed"));
 339                 return EXIT_FAILURE;
 340                 }
 341         captive_options_free(&options);
 342
 343         /* Simulate argv[0] there as it got cut by popt. */
 344         capfuse_argc=4+2*rest_argc;
 345         captive_newn_alloca(capfuse_argv,capfuse_argc+1);
 346         csp=capfuse_argv;
 347         *csp++=argv[0];
 348         *csp++=mountpoint;
 349         *csp++="-o";
 350         *csp++=captive_printf_alloca("fsname=%s" LIBFUSE_ADDONS ",%s",
 351                         image_filename,(options.rwmode==CAPTIVE_OPTION_RWMODE_RO ? "ro" : "rw"));
 352         if (rest_argv)
 353                 while (*rest_argv) {
 354                         *csp++="-o";
 355                         *csp++=*rest_argv++;
 356                         }
 357         *csp=NULL;
 358 #if 0
 359 {
 360 const char **csp;
 361         for (csp=capfuse_argv;*csp;csp++)
 362                 fprintf(stderr,"capfuse_argv: \"%s\"\n",*csp);
 363 }
 364 #endif
 365
 366         /* FIXFUSE: fuse_main()/fuse_main_real() would be enough for Captive fuse but
 367          * the public interface of fuse_main() is too broken.
 368          */
 369         capfuse_run(capfuse_argc,capfuse_argv);
 370
 371         /* 'rest_argv' gets cleared by 'poptFreeContext(context);' below */
 372         if (opt_o)
 373                 poptFreeContext(context);
 374
 375         if (capfuse_captive_vfs_object) {
 376                 g_object_unref(capfuse_captive_vfs_object);
 377                 capfuse_captive_vfs_object=NULL;
 378                 }
 379
 380         return EXIT_SUCCESS;
 381 }