src/main/main.c

   1 /* The main program - startup */
   2
   3 #ifdef HAVE_CONFIG_H
   4 #include "config.h"
   5 #endif
   6
   7 #include <errno.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <sys/types.h>
  12 #ifdef HAVE_FCNTL_H
  13 #include <fcntl.h> /* OS/2 needs this after sys/types.h */
  14 #endif
  15 #ifdef HAVE_UNISTD_H
  16 #include <unistd.h>
  17 #endif
  18
  19 #include "elinks.h"
  20
  21 #include "bfu/dialog.h"
  22 #include "cache/cache.h"
  23 #include "config/cmdline.h"
  24 #include "config/conf.h"
  25 #include "config/home.h"
  26 #include "config/options.h"
  27 #include "dialogs/menu.h"
  28 #include "document/document.h"
  29 #include "intl/charsets.h"
  30 #include "intl/gettext/libintl.h"
  31 #include "main/event.h"
  32 #include "main/interlink.h"
  33 #include "main/main.h"
  34 #include "main/module.h"
  35 #include "main/select.h"
  36 #include "main/version.h"
  37 #include "network/connection.h"
  38 #include "network/dns.h"
  39 #include "network/state.h"
  40 #include "osdep/osdep.h"
  41 #include "osdep/signals.h"
  42 #include "osdep/sysname.h"
  43 #include "protocol/auth/auth.h"
  44 #include "session/download.h"
  45 #include "session/session.h"
  46 #include "terminal/kbd.h"
  47 #include "terminal/screen.h"
  48 #include "terminal/terminal.h"
  49 #include "util/color.h"
  50 #include "util/error.h"
  51 #include "util/file.h"
  52 #include "util/hash.h"
  53 #include "util/memdebug.h"
  54 #include "util/memory.h"
  55 #include "viewer/dump/dump.h"
  56 #include "viewer/text/marks.h"
  57
  58 struct program program;
  59
  60 static int ac;
  61 static unsigned char **av;
  62 static int init_b = 0;
  63
  64 /* Check if either stdin or stdout are pipes */
  65 static void
  66 check_stdio(LIST_OF(struct string_list_item) *url_list)
  67 {
  68         assert(!remote_session_flags);
  69
  70         /* Should the document be read from stdin? */
  71         if (!isatty(STDIN_FILENO)) {
  72                 /* Only start reading from stdin if no URL was given on the
  73                  * command line. */
  74                 if (url_list && list_empty(*url_list)) {
  75                         get_opt_bool("protocol.file.allow_special_files",
  76                                      NULL) = 1;
  77                         add_to_string_list(url_list, "file:///dev/stdin", 17);
  78                 }
  79                 get_cmd_opt_bool("no-connect") = 1;
  80         }
  81
  82         /* If called for outputting to a pipe without -dump or -source
  83          * specified default to using dump viewer. */
  84         if (!isatty(STDOUT_FILENO)) {
  85                 int *dump = &get_cmd_opt_bool("dump");
  86
  87                 if (!*dump && !get_cmd_opt_bool("source"))
  88                         *dump = 1;
  89         }
  90 }
  91
  92 static void
  93 check_cwd(void)
  94 {
  95         unsigned char *cwd = get_cwd();
  96
  97         if (!cwd || !file_is_dir(cwd)) {
  98                 unsigned char *home = getenv("HOME");
  99
 100                 if (home && file_is_dir(home))
 101                         chdir(home);
 102         }
 103
 104         mem_free_if(cwd);
 105 }
 106
 107 static void
 108 init(void)
 109 {
 110         INIT_LIST_OF(struct string_list_item, url_list);
 111         int fd = -1;
 112         enum retval ret;
 113
 114         init_osdep();
 115         check_cwd();
 116
 117 #ifdef CONFIG_NLS
 118         bindtextdomain(PACKAGE, LOCALEDIR);
 119         textdomain(PACKAGE);
 120         set_language(0);
 121 #endif
 122         init_event();
 123         init_charsets_lookup();
 124         init_colors_lookup();
 125         init_modules(main_modules);
 126
 127         init_options();
 128         init_static_version();
 129
 130         register_modules_options(main_modules);
 131         register_modules_options(builtin_modules);
 132         set_sigcld();
 133         get_system_name();
 134
 135         /* XXX: OS/2 has some stupid bug and the pipe must be created before
 136          * socket :-/. -- Mikulas */
 137         if (check_terminal_pipes()) {
 138                 ERROR(gettext("Cannot create a pipe for internal communication."));
 139                 program.retval = RET_FATAL;
 140                 program.terminate = 1;
 141                 return;
 142         }
 143
 144         /* Parsing command line options */
 145         ret = parse_options(ac - 1, av + 1, &url_list);
 146         if (ret != RET_OK) {
 147                 /* Command line handlers return RET_COMMAND to signal that they
 148                  * completed successfully and that the program should stop. */
 149                 if (ret != RET_COMMAND)
 150                         program.retval = ret;
 151                 program.terminate = 1;
 152                 free_string_list(&url_list);
 153                 return;
 154         }
 155
 156         if (!remote_session_flags) {
 157                 check_stdio(&url_list);
 158         } else {
 159                 program.terminate = 1;
 160         }
 161
 162         if (!get_cmd_opt_bool("no-home")) {
 163                 init_home();
 164         }
 165
 166         /* If there's no -no-connect, -dump or -source option, check if there's
 167          * no other ELinks running. If we found any, by-pass initialization of
 168          * non critical subsystems, open socket and act as a slave for it. */
 169         if (get_cmd_opt_bool("no-connect")
 170             || get_cmd_opt_bool("dump")
 171             || get_cmd_opt_bool("source")
 172             || (fd = init_interlink()) == -1) {
 173
 174                 load_config();
 175                 update_options_visibility();
 176                 /* Parse commandline options again, in order to override any
 177                  * config file options. */
 178                 parse_options(ac - 1, av + 1, NULL);
 179                 /* ... and re-check stdio, in order to override any command
 180                  * line options! >;) */
 181                 if (!remote_session_flags) {
 182                         check_stdio(NULL);
 183                 }
 184
 185                 init_b = 1;
 186                 init_modules(builtin_modules);
 187         }
 188
 189         if (get_cmd_opt_bool("dump")
 190             || get_cmd_opt_bool("source")) {
 191                 /* Dump the URL list */
 192 #ifdef CONFIG_ECMASCRIPT
 193                 /* The ECMAScript code is not good at coping with this. And it
 194                  * makes currently no sense to evaluate ECMAScript in this
 195                  * context anyway. */
 196                 get_opt_bool("ecmascript.enable", NULL) = 0;
 197 #endif
 198                 if (!list_empty(url_list)) {
 199                         dump_next(&url_list);
 200                 } else {
 201                         unsigned char *arg = get_cmd_opt_bool("dump")
 202                                            ? "dump" : "source";
 203
 204                         usrerror(gettext("URL expected after -%s"), arg);
 205                         program.retval = RET_SYNTAX;
 206                         program.terminate = 1;
 207                 }
 208
 209         } else if (remote_session_flags & SES_REMOTE_PING) {
 210                 /* If no instance was running return ping failure */
 211                 if (fd == -1) {
 212                         usrerror(gettext("No running ELinks found."));
 213                         program.retval = RET_PING;
 214                 }
 215
 216         } else if (remote_session_flags && fd == -1) {
 217                 /* The remote session(s) can not be created */
 218                 usrerror(gettext("No remote session to connect to."));
 219                 program.retval = RET_REMOTE;
 220
 221         } else {
 222                 struct string info;
 223                 struct terminal *term = NULL;
 224
 225                 if (!encode_session_info(&info, &url_list)) {
 226                         ERROR(gettext("Unable to encode session info."));
 227                         program.retval = RET_FATAL;
 228                         program.terminate = 1;
 229
 230                 } else if (fd != -1) {
 231                         /* Attach to already running ELinks and act as a slave
 232                          * for it. */
 233                         close_terminal_pipes();
 234
 235                         handle_trm(get_input_handle(), get_output_handle(),
 236                                    fd, fd, get_ctl_handle(), info.source, info.length,
 237                                    remote_session_flags);
 238                 } else {
 239                         /* Setup a master terminal */
 240                         term = attach_terminal(get_input_handle(), get_output_handle(),
 241                                                get_ctl_handle(), info.source, info.length);
 242                         if (!term) {
 243                                 ERROR(gettext("Unable to attach_terminal()."));
 244                                 program.retval = RET_FATAL;
 245                                 program.terminate = 1;
 246                         }
 247                 }
 248
 249                 /* OK, this is race condition, but it must be so; GPM installs
 250                  * it's own buggy TSTP handler. */
 251                 if (!program.terminate) handle_basic_signals(term);
 252                 done_string(&info);
 253         }
 254
 255         if (program.terminate) close_terminal_pipes();
 256         free_string_list(&url_list);
 257 }
 258
 259
 260 static void
 261 terminate_all_subsystems(void)
 262 {
 263         done_interlink();
 264         check_bottom_halves();
 265         abort_all_downloads();
 266         check_bottom_halves();
 267         destroy_all_terminals();
 268         check_bottom_halves();
 269         free_all_itrms();
 270
 271         /* When aborting all connections also keep-alive connections are
 272          * aborted. A (normal) connection will be started for any keep-alive
 273          * connection that needs to send a command to the server before
 274          * aborting. This means we need to abort_all_connections() twice.
 275          *
 276          * It forces a some what unclean connection tear-down since at most the
 277          * shutdown routine will be able to send one command. But else it would
 278          * take too long time to terminate. */
 279         abort_all_connections();
 280         check_bottom_halves();
 281         abort_all_connections();
 282
 283         if (init_b) {
 284 #ifdef CONFIG_SCRIPTING
 285                 trigger_event_name("quit");
 286 #endif
 287                 free_history_lists();
 288                 done_modules(builtin_modules);
 289                 done_saved_session_info();
 290         }
 291
 292         shrink_memory(1);
 293         free_charsets_lookup();
 294         free_colors_lookup();
 295         done_modules(main_modules);
 296         free_conv_table();
 297         check_bottom_halves();
 298         done_home();
 299         done_state_message();
 300         done_bfu_colors();
 301         unregister_modules_options(builtin_modules);
 302         unregister_modules_options(main_modules);
 303         done_options();
 304         done_event();
 305         terminate_osdep();
 306 #ifdef CONFIG_COMBINE
 307         free_combined();
 308 #endif
 309 }
 310
 311 void
 312 shrink_memory(int whole)
 313 {
 314         shrink_dns_cache(whole);
 315         shrink_format_cache(whole);
 316         garbage_collection(whole);
 317 }
 318
 319 #ifdef CONFIG_NO_ROOT_EXEC
 320 static void
 321 check_if_root(void)
 322 {
 323         if (!getuid() || !geteuid()) {
 324                 fprintf(stderr, "%s\n\n"
 325                                 "Permission to run this program as root "
 326                                 "user was disabled at compile time.\n\n",
 327                                 full_static_version);
 328                 exit(-1);
 329         }
 330 }
 331 #else
 332 #define check_if_root()
 333 #endif
 334
 335 int
 336 main(int argc, char *argv[])
 337 {
 338         check_if_root();
 339
 340         program.terminate = 0;
 341         program.retval = RET_OK;
 342         program.path = argv[0];
 343         ac = argc;
 344         av = (unsigned char **) argv;
 345
 346         select_loop(init);
 347         terminate_all_subsystems();
 348
 349 #ifdef DEBUG_MEMLEAK
 350         check_memory_leaks();
 351 #endif
 352         return program.retval;
 353 }