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285 lines
7.1 KiB
C
285 lines
7.1 KiB
C
/*
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dtach - A simple program that emulates the detach feature of screen.
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Copyright (C) 2004-2016 Ned T. Crigler
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "dtach.h"
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/*
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** dtach is a quick hack, since I wanted the detach feature of screen without
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** all the other crud. It'll work best with full-screen applications, as it
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** does not keep track of the screen or anything like that.
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*/
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/* Make sure the binary has a copyright. */
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const char copyright[] = "dtach - version " PACKAGE_VERSION "(C)Copyright 2004-2016 Ned T. Crigler";
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/* argv[0] from the program */
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char *progname;
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/* The name of the passed in socket. */
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char *sockname;
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/* The character used for detaching. Defaults to '^\' */
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int detach_char = '\\' - 64;
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/* 1 if we should not interpret the suspend character. */
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int no_suspend;
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/* The default redraw method. Initially set to unspecified. */
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int redraw_method = REDRAW_UNSPEC;
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/*
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** The original terminal settings. Shared between the master and attach
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** processes. The master uses it to initialize the pty, and the attacher uses
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** it to restore the original settings.
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*/
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struct termios orig_term;
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int dont_have_tty;
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static void
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usage()
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{
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printf(
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"dtach - version %s, compiled on %s at %s.\n"
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"Usage: dtach -a <socket> <options>\n"
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" dtach -A <socket> <options> <command...>\n"
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" dtach -c <socket> <options> <command...>\n"
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" dtach -n <socket> <options> <command...>\n"
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" dtach -N <socket> <options> <command...>\n"
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" dtach -p <socket>\n"
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"Modes:\n"
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" -a\t\tAttach to the specified socket.\n"
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" -A\t\tAttach to the specified socket, or create it if it\n"
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"\t\t does not exist, running the specified command.\n"
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" -c\t\tCreate a new socket and run the specified command.\n"
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" -n\t\tCreate a new socket and run the specified command "
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"detached.\n"
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" -N\t\tCreate a new socket and run the specified command "
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"detached,\n"
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"\t\t and have dtach run in the foreground.\n"
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" -p\t\tCopy the contents of standard input to the specified\n"
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"\t\t socket.\n"
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"Options:\n"
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" -e <char>\tSet the detach character to <char>, defaults "
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"to ^\\.\n"
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" -E\t\tDisable the detach character.\n"
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" -r <method>\tSet the redraw method to <method>. The "
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"valid methods are:\n"
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"\t\t none: Don't redraw at all.\n"
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"\t\t ctrl_l: Send a Ctrl L character to the program.\n"
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"\t\t winch: Send a WINCH signal to the program.\n"
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" -z\t\tDisable processing of the suspend key.\n"
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"\nReport any bugs to <" PACKAGE_BUGREPORT ">.\n",
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PACKAGE_VERSION, __DATE__, __TIME__);
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exit(0);
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}
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int
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main(int argc, char **argv)
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{
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int mode = 0;
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/* Save the program name */
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progname = argv[0];
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++argv; --argc;
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/* Parse the arguments */
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if (argc >= 1 && **argv == '-')
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{
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if (strncmp(*argv, "--help", strlen(*argv)) == 0)
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usage();
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else if (strncmp(*argv, "--version", strlen(*argv)) == 0)
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{
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printf("dtach - version %s, compiled on %s at %s.\n",
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PACKAGE_VERSION, __DATE__, __TIME__);
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return 0;
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}
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mode = argv[0][1];
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if (mode == '?')
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usage();
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else if (mode != 'a' && mode != 'c' && mode != 'n' &&
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mode != 'A' && mode != 'N' && mode != 'p')
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{
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printf("%s: Invalid mode '-%c'\n", progname, mode);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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}
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if (!mode)
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{
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printf("%s: No mode was specified.\n", progname);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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++argv; --argc;
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if (argc < 1)
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{
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printf("%s: No socket was specified.\n", progname);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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sockname = *argv;
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++argv; --argc;
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if (mode == 'p')
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{
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if (argc > 0)
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{
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printf("%s: Invalid number of arguments.\n",
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progname);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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return push_main();
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}
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while (argc >= 1 && **argv == '-')
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{
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char *p;
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for (p = argv[0] + 1; *p; ++p)
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{
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if (*p == 'E')
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detach_char = -1;
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else if (*p == 'z')
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no_suspend = 1;
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else if (*p == 'e')
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{
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++argv; --argc;
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if (argc < 1)
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{
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printf("%s: No escape character "
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"specified.\n", progname);
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printf("Try '%s --help' for more "
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"information.\n", progname);
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return 1;
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}
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if (argv[0][0] == '^' && argv[0][1])
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{
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if (argv[0][1] == '?')
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detach_char = '\177';
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else
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detach_char = argv[0][1] & 037;
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}
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else
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detach_char = argv[0][0];
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break;
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}
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else if (*p == 'r')
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{
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++argv; --argc;
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if (argc < 1)
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{
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printf("%s: No redraw method "
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"specified.\n", progname);
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printf("Try '%s --help' for more "
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"information.\n", progname);
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return 1;
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}
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if (strcmp(argv[0], "none") == 0)
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redraw_method = REDRAW_NONE;
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else if (strcmp(argv[0], "ctrl_l") == 0)
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redraw_method = REDRAW_CTRL_L;
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else if (strcmp(argv[0], "winch") == 0)
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redraw_method = REDRAW_WINCH;
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else
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{
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printf("%s: Invalid redraw method "
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"specified.\n", progname);
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printf("Try '%s --help' for more "
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"information.\n", progname);
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return 1;
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}
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break;
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}
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else
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{
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printf("%s: Invalid option '-%c'\n",
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progname, *p);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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}
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++argv; --argc;
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}
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if (mode != 'a' && argc < 1)
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{
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printf("%s: No command was specified.\n", progname);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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/* Save the original terminal settings. */
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if (tcgetattr(0, &orig_term) < 0)
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{
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memset(&orig_term, 0, sizeof(struct termios));
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dont_have_tty = 1;
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}
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if (dont_have_tty && mode != 'n' && mode != 'N')
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{
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printf("%s: Attaching to a session requires a terminal.\n",
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progname);
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return 1;
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}
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if (mode == 'a')
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{
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if (argc > 0)
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{
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printf("%s: Invalid number of arguments.\n",
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progname);
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printf("Try '%s --help' for more information.\n",
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progname);
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return 1;
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}
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return attach_main(0);
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}
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else if (mode == 'n')
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return master_main(argv, 0, 0);
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else if (mode == 'N')
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return master_main(argv, 0, 1);
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else if (mode == 'c')
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{
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if (master_main(argv, 1, 0) != 0)
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return 1;
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return attach_main(0);
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}
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else if (mode == 'A')
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{
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/* Try to attach first. If that doesn't work, create a new
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** socket. */
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if (attach_main(1) != 0)
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{
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if (errno == ECONNREFUSED || errno == ENOENT)
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{
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if (errno == ECONNREFUSED)
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unlink(sockname);
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if (master_main(argv, 1, 0) != 0)
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return 1;
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}
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return attach_main(0);
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}
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}
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return 0;
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}
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