dtach-0.9/0000755000175000017500000000000012713764452012320 5ustar criglercriglerdtach-0.9/.gitignore0000644000175000017500000000020712713764452014307 0ustar criglercrigler# Files generated by configure /Makefile /config.h /config.log /config.status /configure.lineno # Files generated by make *.o /dtach dtach-0.9/COPYING0000644000175000017500000004311012713764452013352 0ustar criglercrigler GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. 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You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. 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If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program 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 2 of the License, or (at your option) any later version. This program 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. dtach-0.9/Makefile.in0000644000175000017500000000167112713764452014372 0ustar criglercriglersrcdir = @srcdir@ CC = @CC@ CFLAGS = @CFLAGS@ -I. LDFLAGS = @LDFLAGS@ LIBS = @LIBS@ VERSION = @PACKAGE_VERSION@ VPATH = $(srcdir) OBJ = attach.o master.o main.o SRC = $(srcdir)/attach.c $(srcdir)/master.c $(srcdir)/main.c TARFILES = $(srcdir)/README $(srcdir)/COPYING $(srcdir)/Makefile.in \ $(srcdir)/config.h.in $(SRC) \ $(srcdir)/dtach.h $(srcdir)/dtach.spec $(srcdir)/configure \ $(srcdir)/configure.ac $(srcdir)/dtach.1 dtach: $(OBJ) $(CC) -o $@ $(LDFLAGS) $(OBJ) $(LIBS) clean: rm -f dtach $(OBJ) dtach-$(VERSION).tar.gz distclean: clean rm -f config.h Makefile config.log config.status config.cache tar: mkdir dtach-$(VERSION) cp $(TARFILES) dtach-$(VERSION) tar -cf dtach-$(VERSION).tar dtach-$(VERSION)/ gzip -9f dtach-$(VERSION).tar rm -rf dtach-$(VERSION) attach.o: @srcdir@/attach.c @srcdir@/dtach.h config.h master.o: @srcdir@/master.c @srcdir@/dtach.h config.h main.o: @srcdir@/main.c @srcdir@/dtach.h config.h dtach-0.9/README0000644000175000017500000002173012713764452013203 0ustar criglercrigler1. INTRODUCTION dtach is a program written in C that emulates the detach feature of screen, which allows a program to be executed in an environment that is protected from the controlling terminal. For instance, the program under the control of dtach would not be affected by the terminal being disconnected for some reason. dtach was written because screen did not adequately meet my needs; I did not need screen's extra features, such as support for multiple terminals or terminal emulation support. screen was also too big, bulky, and had source code that was difficult to understand. screen also interfered with my use of full-screen applications such as emacs and ircII, due to its excessive interpretation of the stream between the program and the attached terminals. dtach does not have a terminal emulation layer, and passes the raw output stream of the program to the attached terminals. The only input processing that dtach does perform is scanning for the detach character (which signals dtach to detach from the program) and processing the suspend key (which tells dtach to temporarily suspend itself without affecting the running program), and both of these can both be disabled if desired. Contrary to screen, dtach has minimal features, and is extremely tiny. This allows dtach to be more easily audited for bugs and security holes, and makes it accessible in environments where space is limited, such as on rescue disks. dtach has only been tested on the Linux/x86 platform, however it should be easily portable to other variants of Unix. It currently assumes that the host system uses POSIX termios, and has a working forkpty function available. dtach may need access to various devices in the filesystem depending on what forkpty does. For example, dtach on Linux usually needs access to /dev/ptmx and /dev/pts. 2. QUICK START Compiling dtach should be simple, as it uses autoconf: $ ./configure $ make If all goes well, a dtach binary should be built for your system. You can then copy it to the appropriate place on your system. dtach uses Unix-domain sockets to represent sessions; these are network sockets that are stored in the filesystem. You specify the name of the socket that dtach should use when creating or attaching to dtach sessions. For example, let's create a new session that is running ircII. We will use /tmp/foozle as the session's socket: $ dtach -A /tmp/foozle irc RuneB irc.freenode.net Here, -A tells dtach to either create a new session or attach to the existing session. If the session at /tmp/foozle does not exist yet, the program will be executed. If it does exist, then dtach will attach to the existing session. dtach has another attach mode, which is specified by using -a. The -a mode attaches to an already existing session, but will not create a new session. Each attaching process can have a separate detach character, suspend behavior, and redraw method, which are explained in the following sections. dtach is able to attach to the same session multiple times, though you will likely encounter problems if your terminals have different window sizes. Pressing ^L (Ctrl-L) will reset the window size of the program to match the current terminal. dtach also has a mode that copies the contents of standard input to a session. For example: $ echo -ne 'cd /var/log\nls -l\n' | dtach -p /tmp/foozle The contents are sent verbatim including any embedded control characters (e.g. the newline characters in the above example), and dtach will not scan the input for a detach character. 3. DETACHING FROM THE SESSION By default, dtach scans the keyboard input looking for the detach character. When the detach character is pressed, dtach will detach from the current session and exit, leaving the program running in the background. You can then re-attach to the program by running dtach again with -A or -a. The default detach character is ^\ (Ctrl-\). This can be changed by supplying the -e option to dtach when attaching. For example: $ dtach -a /tmp/foozle -e '^A' That command would attach to the existing session at /tmp/foozle and use ^A (Ctrl-A) as the detach character, instead of the default ^\. You can disable processing of the detach character by supplying the -E option to dtach when attaching. 4. SUSPENDING DTACH By default, dtach also processes the suspend key (^Z or Ctrl-Z) itself, instead of passing it to the program. Thus, pressing suspend only suspends the attaching process, instead of the running program. This can be very useful for applications such as ircII, where you may not necessarily want the program to be suspended. Processing of the suspend key can be disabled by supplying the -z option to dtach when attaching. 5. REDRAW METHOD When attaching, dtach can use one of three methods to redraw the screen (none, ctrl_l, or winch). By default, dtach uses the ctrl_l method, which simply sends a ^L (Ctrl-L) character to the program if the terminal is in character-at-a-time and no-echo mode. The winch method forces a WINCH signal to be sent to the program, and the none method disables redrawing completely. For example, this command tells dtach to attach to a session at /tmp/foozle and use the winch redraw method: $ dtach -a /tmp/foozle -r winch When creating a new session (with the -c or -A modes), the specified method is used as the default redraw method for the session. 6. CHANGES The changes in version 0.9 are: - Added AIX support. - Added dtach -N, a mode similar to dtach -n, except dtach will stay in the foreground instead of daemonizing. - Added dtach -p, which copies the contents of standard input to a session. - dtach will no longer send 255 bytes of garbage to the program when read() returns an error. - The executable bit is now set on the socket if clients are attached, and cleared when all clients have detached. - The initial state of signals such as SIGPIPE are now preserved when executing the program, instead of having the program start with some signals ignored. - A buffer overflow no longer occurs when a long socket path name is used, and dtach will now try to use chdir to get around the length limitation if necessary. The changes in version 0.8 are: - When using dtach -A or dtach -c, the master will now wait until the client attaches before trying to read from the program being executed. This avoids a race condition when the program prints something and exits before the client can attach itself. - Instead of exiting quietly, dtach will now report any errors that occur while trying to execute the program. - dtach -n can now be used without a terminal. - dtach -A will now try to detect and remove stale sockets. - Removed a Linux-specific escape sequence from the code that restores the original terminal settings. - Changed dtach.1 to use \- for the dashes in command line options, and fix an ambiguous backslash. - Use non-blocking mode in the master process, and avoid data loss by ensuring that at least one attaching client succesfully completes a write. - Fix -e ^ to work with lowercase characters. The changes in version 0.7 are: - The redraw method can now be explicitly specified on the command line (either no redraw at all, the old ^L character method, and the new WINCH signal method), since many programs only handle one or the other properly. - Changed the default redraw method back to the old ^L character method. - Changed the attach code to check the return value of select more carefully. - Changed the SIGWINCH handler to reinstall itself, to handle systems that always reset the handler. - Added more proper process group handling. The changes in version 0.6 are: - Redraws are now handled by sending the child process a WINCH signal instead of by sending a ^L character. This should help prevent line-oriented programs (such as bash) from clearing the screen excessively. - Flow control is now disabled when setting raw mode on the terminal. - Switched to using select instead of poll. - Changed some exits to exit succesfully instead of non-sucessfully. - Updated my email address. - Updated to Autoconf 2.59, renaming some files in the process. The changes in version 0.5 are: - Fix fd leakage. - Prevent atexit from being called twice on dtach -A. The changes in version 0.4 are: - Slightly improved README and dtach.1 - Portability updates thanks to sourceforge's compile farm. dtach should now work on: FreeBSD, Debian/alpha, Debian/sparc, Debian/PPC, and Solaris. The changes in version 0.3 are: - Fixed a typo in dtach.1 - Changed the attach code so that it tells the master when a suspend occurs. - Decreased the client <-> master packet size. - Changed the master to send a stream of text to attaching clients instead of sending a huge packet all the time. - Use getrlimit and dynamically allocate the data structures, if possible. - Added some more autoconf checks. - Initial sourceforge release. 7. AUTHOR dtach is (C)Copyright 2004-2016 Ned T. Crigler, and is under the GNU General Public License. Comments and suggestions about dtach are welcome, and can be sent to the author at: . dtach-0.9/attach.c0000644000175000017500000001677112713764452013744 0ustar criglercrigler/* dtach - A simple program that emulates the detach feature of screen. Copyright (C) 2004-2016 Ned T. Crigler This program 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 2 of the License, or (at your option) any later version. This program 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "dtach.h" #ifndef VDISABLE #ifdef _POSIX_VDISABLE #define VDISABLE _POSIX_VDISABLE #else #define VDISABLE 0377 #endif #endif /* ** The current terminal settings. After coming back from a suspend, we ** restore this. */ static struct termios cur_term; /* 1 if the window size changed */ static int win_changed; /* Restores the original terminal settings. */ static void restore_term(void) { tcsetattr(0, TCSADRAIN, &orig_term); /* Make cursor visible. Assumes VT100. */ printf("\033[?25h"); fflush(stdout); } /* Connects to a unix domain socket */ static int connect_socket(char *name) { int s; struct sockaddr_un sockun; if (strlen(name) > sizeof(sockun.sun_path) - 1) { errno = ENAMETOOLONG; return -1; } s = socket(PF_UNIX, SOCK_STREAM, 0); if (s < 0) return -1; sockun.sun_family = AF_UNIX; strcpy(sockun.sun_path, name); if (connect(s, (struct sockaddr*)&sockun, sizeof(sockun)) < 0) { close(s); /* ECONNREFUSED is also returned for regular files, so make ** sure we are trying to connect to a socket. */ if (errno == ECONNREFUSED) { struct stat st; if (stat(name, &st) < 0) return -1; else if (!S_ISSOCK(st.st_mode) || S_ISREG(st.st_mode)) errno = ENOTSOCK; } return -1; } return s; } /* Signal */ static RETSIGTYPE die(int sig) { /* Print a nice pretty message for some things. */ if (sig == SIGHUP || sig == SIGINT) printf(EOS "\r\n[detached]\r\n"); else printf(EOS "\r\n[got signal %d - dying]\r\n", sig); exit(1); } /* Window size change. */ static RETSIGTYPE win_change() { signal(SIGWINCH, win_change); win_changed = 1; } /* Handles input from the keyboard. */ static void process_kbd(int s, struct packet *pkt) { /* Suspend? */ if (!no_suspend && (pkt->u.buf[0] == cur_term.c_cc[VSUSP])) { /* Tell the master that we are suspending. */ pkt->type = MSG_DETACH; write(s, pkt, sizeof(struct packet)); /* And suspend... */ tcsetattr(0, TCSADRAIN, &orig_term); printf(EOS "\r\n"); kill(getpid(), SIGTSTP); tcsetattr(0, TCSADRAIN, &cur_term); /* Tell the master that we are returning. */ pkt->type = MSG_ATTACH; write(s, pkt, sizeof(struct packet)); /* We would like a redraw, too. */ pkt->type = MSG_REDRAW; pkt->len = redraw_method; ioctl(0, TIOCGWINSZ, &pkt->u.ws); write(s, pkt, sizeof(struct packet)); return; } /* Detach char? */ else if (pkt->u.buf[0] == detach_char) { printf(EOS "\r\n[detached]\r\n"); exit(0); } /* Just in case something pukes out. */ else if (pkt->u.buf[0] == '\f') win_changed = 1; /* Push it out */ write(s, pkt, sizeof(struct packet)); } int attach_main(int noerror) { struct packet pkt; unsigned char buf[BUFSIZE]; fd_set readfds; int s; /* Attempt to open the socket. Don't display an error if noerror is ** set. */ s = connect_socket(sockname); if (s < 0 && errno == ENAMETOOLONG) { char *slash = strrchr(sockname, '/'); /* Try to shorten the socket's path name by using chdir. */ if (slash) { int dirfd = open(".", O_RDONLY); if (dirfd >= 0) { *slash = '\0'; if (chdir(sockname) >= 0) { s = connect_socket(slash + 1); fchdir(dirfd); } *slash = '/'; close(dirfd); } } } if (s < 0) { if (!noerror) printf("%s: %s: %s\n", progname, sockname, strerror(errno)); return 1; } /* The current terminal settings are equal to the original terminal ** settings at this point. */ cur_term = orig_term; /* Set a trap to restore the terminal when we die. */ atexit(restore_term); /* Set some signals. */ signal(SIGPIPE, SIG_IGN); signal(SIGXFSZ, SIG_IGN); signal(SIGHUP, die); signal(SIGTERM, die); signal(SIGINT, die); signal(SIGQUIT, die); signal(SIGWINCH, win_change); /* Set raw mode. */ cur_term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL); cur_term.c_iflag &= ~(IXON|IXOFF); cur_term.c_oflag &= ~(OPOST); cur_term.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); cur_term.c_cflag &= ~(CSIZE|PARENB); cur_term.c_cflag |= CS8; cur_term.c_cc[VLNEXT] = VDISABLE; cur_term.c_cc[VMIN] = 1; cur_term.c_cc[VTIME] = 0; tcsetattr(0, TCSADRAIN, &cur_term); /* Clear the screen. 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So we exec the FD to /dev/null, # effectively closing config.log, so it can be properly (re)opened and # appended to by config.status. When coming back to configure, we # need to make the FD available again. if test "$no_create" != yes; then ac_cs_success=: ac_config_status_args= test "$silent" = yes && ac_config_status_args="$ac_config_status_args --quiet" exec 5>/dev/null $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false exec 5>>config.log # Use ||, not &&, to avoid exiting from the if with $? = 1, which # would make configure fail if this is the last instruction. $ac_cs_success || as_fn_exit 1 fi if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;} fi dtach-0.9/configure.ac0000644000175000017500000000162712713764452014614 0ustar criglercrigler# Process this file with autoconf to produce a configure script. AC_INIT(dtach, 0.9, crigler@users.sourceforge.net) AC_PREREQ(2.60) AC_CONFIG_SRCDIR(main.c) AC_CONFIG_HEADER(config.h) # Checks for programs. AC_PROG_CC AC_PROG_GCC_TRADITIONAL if test "$GCC" = yes; then CFLAGS="$CFLAGS -W -Wall"; fi # Checks for libraries. AC_CHECK_LIB(util, openpty) AC_CHECK_LIB(socket, socket) # Checks for header files. AC_CHECK_HEADERS(fcntl.h sys/select.h sys/socket.h sys/time.h) AC_CHECK_HEADERS(sys/ioctl.h sys/resource.h pty.h termios.h util.h) AC_CHECK_HEADERS(libutil.h stropts.h) AC_HEADER_TIME # Checks for typedefs, structures, and compiler characteristics. AC_C_CONST AC_TYPE_PID_T AC_TYPE_SSIZE_T # Checks for library functions. AC_TYPE_SIGNAL AC_CHECK_FUNCS(atexit dup2 memset) AC_CHECK_FUNCS(select socket strerror) AC_CHECK_FUNCS(openpty forkpty ptsname grantpt unlockpt) AC_CONFIG_FILES(Makefile) AC_OUTPUT dtach-0.9/dtach.10000644000175000017500000001325412713764452013472 0ustar criglercrigler.TH dtach 1 "May 2016" "dtach 0.9" .SH NAME dtach \- simple program that emulates the detach feature of screen. .SH SYNOPSIS .B dtach \-a .I .br .B dtach \-A .I .br .B dtach \-c .I .br .B dtach \-n .I .br .B dtach \-N .I .br .B dtach \-p .I .SH DESCRIPTION .B dtach is a program that emulates the detach feature of screen. It is designed to be transparent and un-intrusive; it avoids interpreting the input and output between attached terminals and the program under its control. Consequently, it works best with full-screen applications such as emacs. .B dtach is intended for users who want the detach feature of screen without the other overhead of screen. It is tiny, does not use many libraries, and stays out of the way as much as possible. .SS SESSIONS A session in .B dtach is a single instance in which a program is running under the control of .BR dtach . The program is disassociated from the original terminal, and is thus protected from your original terminal being disconnected for some reason. .PP Other instances of .B dtach can attach themselves to a particular session. Input and output is copied between the program running in the .B dtach session, and the attached terminals. .PP .B dtach avoids interpreting the communication stream between the program and the attached terminals; it instead relies on the ability of the attached terminals to manage the screen. .PP Sessions are represented by Unix-domain sockets in the filesystem. No other permission checking other than the filesystem access checks is performed. .B dtach creates a master process that monitors the session socket, the program, and any attached terminals. .PP .SS MODES .B dtach has several modes of operation. It can create a new session in which a program is executed, or it can attach to an existing session. The first argument specifies which mode .B dtach should operate in. .TP .B \-a Attach to an existing session. .B dtach attaches itself to the session specified by .IR . After the attach is completed, the window size of the current terminal is sent to the master process, and a redraw is also requested. .TP .B \-A Attach to an existing session, or create a new one. .B dtach first tries to attach to the session specified by .I if possible. If the attempt to open the socket fails, .B dtach tries to create a new session before attaching to it. .TP .B \-c Creates a new session. A new session is created in which the specified program is executed. .B dtach then tries to attach itself to the newly created session. .TP .B \-n Creates a new session, without attaching to it. A new session is created in which the specified program is executed. .B dtach does not try to attach to the newly created session, however, and exits instead. .TP .B \-N Creates a new session, without attaching to it or daemonizing. A new session is created in which the specified program is executed. .B dtach does not try to attach to the newly created session, however, and will stay in the foreground until the program exits. .TP .B \-p Copies the contents of standard input to a session. .B dtach connects to the session specified by .IR , copies the contents of standard input to the session, and then exits. dtach will not scan the input for a detach character. .PP .SS OPTIONS .B dtach has a few options that allow you to modify its behavior. Each attaching process can have separate settings for these options, which allows for some flexibility. .TP .BI "\-e " "" Sets the detach character to .IR . When the detach character is pressed, .B dtach detaches itself from the current session and exits. The process running in the session is unaffected by the detach. By default, the detach character is set to ^\e (Ctrl-\e). .TP .B \-E Disables the detach character. .B dtach does not try to scan input from the terminal for a detach character. The only way to detach from the session is then by sending the attaching process an appropriate signal. .TP .BI "\-r " "" Sets the redraw method to .IR . The valid methods are .IR none , .IR ctrl_l , or .IR winch . .I none disables redrawing completely, .I ctrl_l sends a Ctrl L character to the program if the terminal is in character-at-a-time and no-echo mode, and .I winch forces a WINCH signal to be sent to the program. When creating a new session, the specified method is used as the default redraw method for the session. If not specified, the .I ctrl_l method is used. .TP .B \-z Disables processing of the suspend key. Normally, .B dtach will suspend itself when the suspend key is pressed. With this option, the suspend character is sent to the session instead of being handled by .BR dtach . .PP .SH EXAMPLES The following example creates a new session that has the detach character and suspend processing disabled. A socket is created in the /tmp directory for the session. .nf $ dtach \-c /tmp/foozle \-Ez bash .fi The following example attaches to the /tmp/foozle session if it exists, and if not, creates a new session using /tmp/foozle as the socket for the session. Processing of the suspend character is also disabled for the attach instance. .nf $ dtach \-A /tmp/foozle \-z bash .fi The following example attaches to the /tmp/foozle session, using the .I winch redraw method to redraw the screen. .nf $ dtach \-a /tmp/foozle \-r winch .fi The following example creates a new session and sets the default redraw method for the session to the .I winch redraw method. .nf $ dtach \-c /tmp/foozle \-r winch bash .fi .PP .SH AUTHOR Ned T. Crigler . .SH "SEE ALSO" .BR screen "(1)" dtach-0.9/dtach.h0000644000175000017500000000552312713764452013561 0ustar criglercrigler/* dtach - A simple program that emulates the detach feature of screen. Copyright (C) 2001, 2004-2016 Ned T. Crigler This program 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 2 of the License, or (at your option) any later version. This program 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef dtach_h #define dtach_h #include #include #include #include #include #include #include #if TIME_WITH_SYS_TIME #include #include #else #if HAVE_SYS_TIME_H #include #else #include #endif #endif #ifdef HAVE_PTY_H #include #endif #ifdef HAVE_UTIL_H #include #endif #ifdef HAVE_LIBUTIL_H #include #endif #ifdef HAVE_STROPTS_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_SYS_IOCTL_H #include #endif #ifdef HAVE_SYS_RESOURCE_H #include #endif #include #include #include #include #include #ifndef S_ISREG #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) #endif #ifndef S_ISSOCK #define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK) #endif extern char *progname, *sockname; extern int detach_char, no_suspend, redraw_method; extern struct termios orig_term; extern int dont_have_tty; enum { MSG_PUSH = 0, MSG_ATTACH = 1, MSG_DETACH = 2, MSG_WINCH = 3, MSG_REDRAW = 4, }; enum { REDRAW_UNSPEC = 0, REDRAW_NONE = 1, REDRAW_CTRL_L = 2, REDRAW_WINCH = 3, }; /* The client to master protocol. */ struct packet { unsigned char type; unsigned char len; union { unsigned char buf[sizeof(struct winsize)]; struct winsize ws; } u; }; /* ** The master sends a simple stream of text to the attaching clients, without ** any protocol. This might change back to the packet based protocol in the ** future. In the meantime, however, we minimize the amount of data sent back ** and forth between the client and the master. BUFSIZE is the size of the ** buffer used for the text stream. */ #define BUFSIZE 4096 /* This hopefully moves to the bottom of the screen */ #define EOS "\033[999H" int attach_main(int noerror); int master_main(char **argv, int waitattach, int dontfork); int push_main(void); #ifdef sun #define BROKEN_MASTER #endif #endif dtach-0.9/dtach.spec0000644000175000017500000000701112713764452014256 0ustar criglercriglerSummary: A simple program that emulates the detach feature of screen. Name: dtach Version: 0.9 Release: 1 License: GPL URL: http://dtach.sourceforge.net Group: Applications/System Source: http://prdownloads.sourceforge.net/dtach/dtach-%{version}.tar.gz Buildroot: %{_tmppath}/%{name}-%{version}-root %description dtach is a program that emulates the detach feature of screen, with less overhead. It is designed to be transparent and un-intrusive; it avoids interpreting the input and output between attached terminals and the program under its control. Consequently, it works best with full-screen applications such as emacs. %prep %setup %build %configure make %install rm -rf $RPM_BUILD_ROOT/* mkdir -p $RPM_BUILD_ROOT/%{_bindir} mkdir -p $RPM_BUILD_ROOT/usr/share/doc/dtach-%{version} mkdir -p $RPM_BUILD_ROOT/%{_mandir}/man1 install -m 755 dtach $RPM_BUILD_ROOT/%{_bindir}/dtach install -m 644 dtach.1 $RPM_BUILD_ROOT/%{_mandir}/man1/dtach.1 %clean make clean rm -rf $RPM_BUILD_ROOT rm -rf $RPM_BUILD_DIR/%{name}-%{version} %files %defattr(-,root,root,-) %doc COPYING README %{_bindir}/dtach %{_mandir}/*/* %changelog * Sun May 8 2016 Ned T. Crigler 0.9 - New release * Wed Jan 30 2008 Ned T. Crigler 0.8 - New release * Sat Jul 3 2004 Ned T. Crigler 0.7 - New release * Fri Nov 30 2001 Ned T. Crigler 0.5 - Fix fd leakage. - Prevent atexit from being called twice on dtach -A. * Fri Nov 30 2001 Trond Eivind Glomsrød 0.4-1 - s/Copyright/License/ - Minor description change - fix use of %%doc - Add full location of source tarball * Sat Nov 03 2001 Ned T. Crigler 0.4 - Portability updates thanks to sourceforge's compile farm. dtach should now work on: FreeBSD, Debian/alpha, Debian/PPC, Debian/sparc, Debian/PPC, and Solaris. * Thu Sep 27 2001 Ned T. Crigler - Modified spec file URL: to point to http://dtach.sourceforge.net * Wed Sep 26 2001 Ned T. Crigler 0.3 - Use getrlimit and dynamically allocate the data structures, if possible. - Added some more autoconf checks. - Initial sourceforge release. * Thu Sep 20 2001 Ned T. Crigler - Changed the master to send a stream of text to attaching clients instead of sending a huge packet all the time. - Decreased the client <-> master packet size. - Changed the attach code so that it tells the master when a suspend occurs. * Tue Sep 18 2001 Ned T. Crigler - Fixed a typo in dtach.1 * Tue Sep 18 2001 Ned T. Crigler 0.2 - Removed silly thinko regarding terminal settings in attach, we always set the terminal to raw mode now. - Moved redraw code into the master, which tries to be smarter when using ^L. - Moved the code that obtains the current terminal settings into main, preventing a race condition between the master and attach processes. - Rewrote argument parsing code. - Changed name to dtach. - Added a man page. * Mon Sep 17 2001 Ned T. Crigler - Changed fchmod to chmod in create_socket. * Mon Sep 17 2001 Isaiah Weiner - Modified spec file to correct detach binary permissions - Modified spec file to correct detach documentation path - Modified spec file URL: to point to http://people.redhat.com/iweiner/detach - Modified spec file %clean to remove buildroot and builddir. * Mon Sep 17 2001 Ned T. Crigler 0.1 - Initial rpm release. dtach-0.9/main.c0000644000175000017500000001622712713764452013420 0ustar criglercrigler/* dtach - A simple program that emulates the detach feature of screen. Copyright (C) 2004-2016 Ned T. Crigler This program 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 2 of the License, or (at your option) any later version. This program 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "dtach.h" /* ** dtach is a quick hack, since I wanted the detach feature of screen without ** all the other crud. It'll work best with full-screen applications, as it ** does not keep track of the screen or anything like that. */ /* Make sure the binary has a copyright. */ const char copyright[] = "dtach - version " PACKAGE_VERSION "(C)Copyright 2004-2016 Ned T. Crigler"; /* argv[0] from the program */ char *progname; /* The name of the passed in socket. */ char *sockname; /* The character used for detaching. Defaults to '^\' */ int detach_char = '\\' - 64; /* 1 if we should not interpret the suspend character. */ int no_suspend; /* The default redraw method. Initially set to unspecified. */ int redraw_method = REDRAW_UNSPEC; /* ** The original terminal settings. Shared between the master and attach ** processes. The master uses it to initialize the pty, and the attacher uses ** it to restore the original settings. */ struct termios orig_term; int dont_have_tty; static void usage() { printf( "dtach - version %s, compiled on %s at %s.\n" "Usage: dtach -a \n" " dtach -A \n" " dtach -c \n" " dtach -n \n" " dtach -N \n" " dtach -p \n" "Modes:\n" " -a\t\tAttach to the specified socket.\n" " -A\t\tAttach to the specified socket, or create it if it\n" "\t\t does not exist, running the specified command.\n" " -c\t\tCreate a new socket and run the specified command.\n" " -n\t\tCreate a new socket and run the specified command " "detached.\n" " -N\t\tCreate a new socket and run the specified command " "detached,\n" "\t\t and have dtach run in the foreground.\n" " -p\t\tCopy the contents of standard input to the specified\n" "\t\t socket.\n" "Options:\n" " -e \tSet the detach character to , defaults " "to ^\\.\n" " -E\t\tDisable the detach character.\n" " -r \tSet the redraw method to . The " "valid methods are:\n" "\t\t none: Don't redraw at all.\n" "\t\t ctrl_l: Send a Ctrl L character to the program.\n" "\t\t winch: Send a WINCH signal to the program.\n" " -z\t\tDisable processing of the suspend key.\n" "\nReport any bugs to <" PACKAGE_BUGREPORT ">.\n", PACKAGE_VERSION, __DATE__, __TIME__); exit(0); } int main(int argc, char **argv) { int mode = 0; /* Save the program name */ progname = argv[0]; ++argv; --argc; /* Parse the arguments */ if (argc >= 1 && **argv == '-') { if (strncmp(*argv, "--help", strlen(*argv)) == 0) usage(); else if (strncmp(*argv, "--version", strlen(*argv)) == 0) { printf("dtach - version %s, compiled on %s at %s.\n", PACKAGE_VERSION, __DATE__, __TIME__); return 0; } mode = argv[0][1]; if (mode == '?') usage(); else if (mode != 'a' && mode != 'c' && mode != 'n' && mode != 'A' && mode != 'N' && mode != 'p') { printf("%s: Invalid mode '-%c'\n", progname, mode); printf("Try '%s --help' for more information.\n", progname); return 1; } } if (!mode) { printf("%s: No mode was specified.\n", progname); printf("Try '%s --help' for more information.\n", progname); return 1; } ++argv; --argc; if (argc < 1) { printf("%s: No socket was specified.\n", progname); printf("Try '%s --help' for more information.\n", progname); return 1; } sockname = *argv; ++argv; --argc; if (mode == 'p') { if (argc > 0) { printf("%s: Invalid number of arguments.\n", progname); printf("Try '%s --help' for more information.\n", progname); return 1; } return push_main(); } while (argc >= 1 && **argv == '-') { char *p; for (p = argv[0] + 1; *p; ++p) { if (*p == 'E') detach_char = -1; else if (*p == 'z') no_suspend = 1; else if (*p == 'e') { ++argv; --argc; if (argc < 1) { printf("%s: No escape character " "specified.\n", progname); printf("Try '%s --help' for more " "information.\n", progname); return 1; } if (argv[0][0] == '^' && argv[0][1]) { if (argv[0][1] == '?') detach_char = '\177'; else detach_char = argv[0][1] & 037; } else detach_char = argv[0][0]; break; } else if (*p == 'r') { ++argv; --argc; if (argc < 1) { printf("%s: No redraw method " "specified.\n", progname); printf("Try '%s --help' for more " "information.\n", progname); return 1; } if (strcmp(argv[0], "none") == 0) redraw_method = REDRAW_NONE; else if (strcmp(argv[0], "ctrl_l") == 0) redraw_method = REDRAW_CTRL_L; else if (strcmp(argv[0], "winch") == 0) redraw_method = REDRAW_WINCH; else { printf("%s: Invalid redraw method " "specified.\n", progname); printf("Try '%s --help' for more " "information.\n", progname); return 1; } break; } else { printf("%s: Invalid option '-%c'\n", progname, *p); printf("Try '%s --help' for more information.\n", progname); return 1; } } ++argv; --argc; } if (mode != 'a' && argc < 1) { printf("%s: No command was specified.\n", progname); printf("Try '%s --help' for more information.\n", progname); return 1; } /* Save the original terminal settings. */ if (tcgetattr(0, &orig_term) < 0) { memset(&orig_term, 0, sizeof(struct termios)); dont_have_tty = 1; } if (dont_have_tty && mode != 'n' && mode != 'N') { printf("%s: Attaching to a session requires a terminal.\n", progname); return 1; } if (mode == 'a') { if (argc > 0) { printf("%s: Invalid number of arguments.\n", progname); printf("Try '%s --help' for more information.\n", progname); return 1; } return attach_main(0); } else if (mode == 'n') return master_main(argv, 0, 0); else if (mode == 'N') return master_main(argv, 0, 1); else if (mode == 'c') { if (master_main(argv, 1, 0) != 0) return 1; return attach_main(0); } else if (mode == 'A') { /* Try to attach first. If that doesn't work, create a new ** socket. */ if (attach_main(1) != 0) { if (errno == ECONNREFUSED || errno == ENOENT) { if (errno == ECONNREFUSED) unlink(sockname); if (master_main(argv, 1, 0) != 0) return 1; } return attach_main(0); } } return 0; } dtach-0.9/master.c0000644000175000017500000003760412713764452013771 0ustar criglercrigler/* dtach - A simple program that emulates the detach feature of screen. Copyright (C) 2004-2016 Ned T. Crigler This program 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 2 of the License, or (at your option) any later version. This program 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "dtach.h" /* The pty struct - The pty information is stored here. */ struct pty { /* File descriptor of the pty */ int fd; #ifdef BROKEN_MASTER /* File descriptor of the slave side of the pty. For broken systems. */ int slave; #endif /* Process id of the child. */ pid_t pid; /* The terminal parameters of the pty. Old and new for comparision ** purposes. */ struct termios term; /* The current window size of the pty. */ struct winsize ws; }; /* A connected client */ struct client { /* The next client in the linked list. */ struct client *next; /* The previous client in the linked list. */ struct client **pprev; /* File descriptor of the client. */ int fd; /* Whether or not the client is attached. */ int attached; }; /* The list of connected clients. */ static struct client *clients; /* The pseudo-terminal created for the child process. */ static struct pty the_pty; #ifndef HAVE_FORKPTY pid_t forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp); #endif /* Unlink the socket */ static void unlink_socket(void) { unlink(sockname); } /* Signal */ static RETSIGTYPE die(int sig) { /* Well, the child died. */ if (sig == SIGCHLD) { #ifdef BROKEN_MASTER /* Damn you Solaris! */ close(the_pty.fd); #endif return; } exit(1); } /* Sets a file descriptor to non-blocking mode. */ static int setnonblocking(int fd) { int flags; #if defined(O_NONBLOCK) flags = fcntl(fd, F_GETFL); if (flags < 0 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) return -1; return 0; #elif defined(FIONBIO) flags = 1; if (ioctl(fd, FIONBIO, &flags) < 0) return -1; return 0; #else #warning Do not know how to set non-blocking mode. return 0; #endif } /* Initialize the pty structure. */ static int init_pty(char **argv, int statusfd) { /* Use the original terminal's settings. We don't have to set the ** window size here, because the attacher will send it in a packet. */ the_pty.term = orig_term; memset(&the_pty.ws, 0, sizeof(struct winsize)); /* Create the pty process */ if (!dont_have_tty) the_pty.pid = forkpty(&the_pty.fd, NULL, &the_pty.term, NULL); else the_pty.pid = forkpty(&the_pty.fd, NULL, NULL, NULL); if (the_pty.pid < 0) return -1; else if (the_pty.pid == 0) { /* Child.. Execute the program. */ execvp(*argv, argv); /* Report the error to statusfd if we can, or stdout if we ** can't. */ if (statusfd != -1) dup2(statusfd, 1); else printf(EOS "\r\n"); printf("%s: could not execute %s: %s\r\n", progname, *argv, strerror(errno)); fflush(stdout); _exit(127); } /* Parent.. Finish up and return */ #ifdef BROKEN_MASTER { char *buf; buf = ptsname(the_pty.fd); the_pty.slave = open(buf, O_RDWR|O_NOCTTY); } #endif return 0; } /* Send a signal to the slave side of a pseudo-terminal. */ static void killpty(struct pty *pty, int sig) { pid_t pgrp = -1; #ifdef TIOCSIGNAL if (ioctl(pty->fd, TIOCSIGNAL, sig) >= 0) return; #endif #ifdef TIOCSIG if (ioctl(pty->fd, TIOCSIG, sig) >= 0) return; #endif #ifdef TIOCGPGRP #ifdef BROKEN_MASTER if (ioctl(pty->slave, TIOCGPGRP, &pgrp) >= 0 && pgrp != -1 && kill(-pgrp, sig) >= 0) return; #endif if (ioctl(pty->fd, TIOCGPGRP, &pgrp) >= 0 && pgrp != -1 && kill(-pgrp, sig) >= 0) return; #endif /* Fallback using the child's pid. */ kill(-pty->pid, sig); } /* Creates a new unix domain socket. */ static int create_socket(char *name) { int s; struct sockaddr_un sockun; if (strlen(name) > sizeof(sockun.sun_path) - 1) { errno = ENAMETOOLONG; return -1; } s = socket(PF_UNIX, SOCK_STREAM, 0); if (s < 0) return -1; sockun.sun_family = AF_UNIX; strcpy(sockun.sun_path, name); if (bind(s, (struct sockaddr*)&sockun, sizeof(sockun)) < 0) { close(s); return -1; } if (listen(s, 128) < 0) { close(s); return -1; } if (setnonblocking(s) < 0) { close(s); return -1; } /* chmod it to prevent any suprises */ if (chmod(name, 0600) < 0) { close(s); return -1; } return s; } /* Update the modes on the socket. */ static void update_socket_modes(int exec) { struct stat st; mode_t newmode; if (stat(sockname, &st) < 0) return; if (exec) newmode = st.st_mode | S_IXUSR; else newmode = st.st_mode & ~S_IXUSR; if (st.st_mode != newmode) chmod(sockname, newmode); } /* Process activity on the pty - Input and terminal changes are sent out to ** the attached clients. If the pty goes away, we die. */ static void pty_activity(int s) { unsigned char buf[BUFSIZE]; ssize_t len; struct client *p; fd_set readfds, writefds; int highest_fd, nclients; /* Read the pty activity */ len = read(the_pty.fd, buf, sizeof(buf)); /* Error -> die */ if (len <= 0) exit(1); #ifdef BROKEN_MASTER /* Get the current terminal settings. */ if (tcgetattr(the_pty.slave, &the_pty.term) < 0) exit(1); #else /* Get the current terminal settings. */ if (tcgetattr(the_pty.fd, &the_pty.term) < 0) exit(1); #endif top: /* ** Wait until at least one client is writable. Also wait on the control ** socket in case a new client tries to connect. */ FD_ZERO(&readfds); FD_ZERO(&writefds); FD_SET(s, &readfds); highest_fd = s; for (p = clients, nclients = 0; p; p = p->next) { if (!p->attached) continue; FD_SET(p->fd, &writefds); if (p->fd > highest_fd) highest_fd = p->fd; nclients++; } if (nclients == 0) return; if (select(highest_fd + 1, &readfds, &writefds, NULL, NULL) < 0) return; /* Send the data out to the clients. */ for (p = clients, nclients = 0; p; p = p->next) { ssize_t written; if (!FD_ISSET(p->fd, &writefds)) continue; written = 0; while (written < len) { ssize_t n = write(p->fd, buf + written, len - written); if (n > 0) { written += n; continue; } else if (n < 0 && errno == EINTR) continue; else if (n < 0 && errno != EAGAIN) nclients = -1; break; } if (nclients != -1 && written == len) nclients++; } /* Try again if nothing happened. */ if (!FD_ISSET(s, &readfds) && nclients == 0) goto top; } /* Process activity on the control socket */ static void control_activity(int s) { int fd; struct client *p; /* Accept the new client and link it in. */ fd = accept(s, NULL, NULL); if (fd < 0) return; else if (setnonblocking(fd) < 0) { close(fd); return; } /* Link it in. */ p = malloc(sizeof(struct client)); p->fd = fd; p->attached = 0; p->pprev = &clients; p->next = *(p->pprev); if (p->next) p->next->pprev = &p->next; *(p->pprev) = p; } /* Process activity from a client. */ static void client_activity(struct client *p) { ssize_t len; struct packet pkt; /* Read the activity. */ len = read(p->fd, &pkt, sizeof(struct packet)); if (len < 0 && (errno == EAGAIN || errno == EINTR)) return; /* Close the client on an error. */ if (len <= 0) { close(p->fd); if (p->next) p->next->pprev = p->pprev; *(p->pprev) = p->next; free(p); return; } /* Push out data to the program. */ if (pkt.type == MSG_PUSH) { if (pkt.len <= sizeof(pkt.u.buf)) write(the_pty.fd, pkt.u.buf, pkt.len); } /* Attach or detach from the program. */ else if (pkt.type == MSG_ATTACH) p->attached = 1; else if (pkt.type == MSG_DETACH) p->attached = 0; /* Window size change request, without a forced redraw. */ else if (pkt.type == MSG_WINCH) { the_pty.ws = pkt.u.ws; ioctl(the_pty.fd, TIOCSWINSZ, &the_pty.ws); } /* Force a redraw using a particular method. */ else if (pkt.type == MSG_REDRAW) { int method = pkt.len; /* If the client didn't specify a particular method, use ** whatever we had on startup. */ if (method == REDRAW_UNSPEC) method = redraw_method; if (method == REDRAW_NONE) return; /* Set the window size. */ the_pty.ws = pkt.u.ws; ioctl(the_pty.fd, TIOCSWINSZ, &the_pty.ws); /* Send a ^L character if the terminal is in no-echo and ** character-at-a-time mode. */ if (method == REDRAW_CTRL_L) { char c = '\f'; if (((the_pty.term.c_lflag & (ECHO|ICANON)) == 0) && (the_pty.term.c_cc[VMIN] == 1)) { write(the_pty.fd, &c, 1); } } /* Send a WINCH signal to the program. */ else if (method == REDRAW_WINCH) { killpty(&the_pty, SIGWINCH); } } } /* The master process - It watches over the pty process and the attached */ /* clients. */ static void master_process(int s, char **argv, int waitattach, int statusfd) { struct client *p, *next; fd_set readfds; int highest_fd; int nullfd; int has_attached_client = 0; /* Okay, disassociate ourselves from the original terminal, as we ** don't care what happens to it. */ setsid(); /* Set a trap to unlink the socket when we die. */ atexit(unlink_socket); /* Create a pty in which the process is running. */ signal(SIGCHLD, die); if (init_pty(argv, statusfd) < 0) { if (statusfd != -1) dup2(statusfd, 1); if (errno == ENOENT) printf("%s: Could not find a pty.\n", progname); else printf("%s: init_pty: %s\n", progname, strerror(errno)); exit(1); } /* Set up some signals. */ signal(SIGPIPE, SIG_IGN); signal(SIGXFSZ, SIG_IGN); signal(SIGHUP, SIG_IGN); signal(SIGTTIN, SIG_IGN); signal(SIGTTOU, SIG_IGN); signal(SIGINT, die); signal(SIGTERM, die); /* Close statusfd, since we don't need it anymore. */ if (statusfd != -1) close(statusfd); /* Make sure stdin/stdout/stderr point to /dev/null. We are now a ** daemon. */ nullfd = open("/dev/null", O_RDWR); dup2(nullfd, 0); dup2(nullfd, 1); dup2(nullfd, 2); if (nullfd > 2) close(nullfd); /* Loop forever. */ while (1) { int new_has_attached_client = 0; /* Re-initialize the file descriptor set for select. */ FD_ZERO(&readfds); FD_SET(s, &readfds); highest_fd = s; /* ** When waitattach is set, wait until the client attaches ** before trying to read from the pty. */ if (waitattach) { if (clients && clients->attached) waitattach = 0; } else { FD_SET(the_pty.fd, &readfds); if (the_pty.fd > highest_fd) highest_fd = the_pty.fd; } for (p = clients; p; p = p->next) { FD_SET(p->fd, &readfds); if (p->fd > highest_fd) highest_fd = p->fd; if (p->attached) new_has_attached_client = 1; } /* chmod the socket if necessary. */ if (has_attached_client != new_has_attached_client) { update_socket_modes(new_has_attached_client); has_attached_client = new_has_attached_client; } /* Wait for something to happen. */ if (select(highest_fd + 1, &readfds, NULL, NULL, NULL) < 0) { if (errno == EINTR || errno == EAGAIN) continue; exit(1); } /* New client? */ if (FD_ISSET(s, &readfds)) control_activity(s); /* Activity on a client? */ for (p = clients; p; p = next) { next = p->next; if (FD_ISSET(p->fd, &readfds)) client_activity(p); } /* pty activity? */ if (FD_ISSET(the_pty.fd, &readfds)) pty_activity(s); } } int master_main(char **argv, int waitattach, int dontfork) { int fd[2] = {-1, -1}; int s; pid_t pid; /* Use a default redraw method if one hasn't been specified yet. */ if (redraw_method == REDRAW_UNSPEC) redraw_method = REDRAW_CTRL_L; /* Create the unix domain socket. */ s = create_socket(sockname); if (s < 0 && errno == ENAMETOOLONG) { char *slash = strrchr(sockname, '/'); /* Try to shorten the socket's path name by using chdir. */ if (slash) { int dirfd = open(".", O_RDONLY); if (dirfd >= 0) { *slash = '\0'; if (chdir(sockname) >= 0) { s = create_socket(slash + 1); fchdir(dirfd); } *slash = '/'; close(dirfd); } } } if (s < 0) { printf("%s: %s: %s\n", progname, sockname, strerror(errno)); return 1; } #if defined(F_SETFD) && defined(FD_CLOEXEC) fcntl(s, F_SETFD, FD_CLOEXEC); /* If FD_CLOEXEC works, create a pipe and use it to report any errors ** that occur while trying to execute the program. */ if (dontfork) { fd[1] = dup(2); if (fcntl(fd[1], F_SETFD, FD_CLOEXEC) < 0) { close(fd[1]); fd[1] = -1; } } else if (pipe(fd) >= 0) { if (fcntl(fd[0], F_SETFD, FD_CLOEXEC) < 0 || fcntl(fd[1], F_SETFD, FD_CLOEXEC) < 0) { close(fd[0]); close(fd[1]); fd[0] = fd[1] = -1; } } #endif if (dontfork) { master_process(s, argv, waitattach, fd[1]); return 0; } /* Fork off so we can daemonize and such */ pid = fork(); if (pid < 0) { printf("%s: fork: %s\n", progname, strerror(errno)); unlink_socket(); return 1; } else if (pid == 0) { /* Child - this becomes the master */ if (fd[0] != -1) close(fd[0]); master_process(s, argv, waitattach, fd[1]); return 0; } /* Parent - just return. */ #if defined(F_SETFD) && defined(FD_CLOEXEC) /* Check if an error occurred while trying to execute the program. */ if (fd[0] != -1) { char buf[1024]; ssize_t len; close(fd[1]); len = read(fd[0], buf, sizeof(buf)); if (len > 0) { write(2, buf, len); kill(pid, SIGTERM); return 1; } close(fd[0]); } #endif close(s); return 0; } /* BSDish functions for systems that don't have them. */ #ifndef HAVE_OPENPTY #define HAVE_OPENPTY /* openpty: Use /dev/ptmx and Unix98 if we have it. */ #if defined(HAVE_PTSNAME) && defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) int openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp) { int master, slave; char *buf; #ifdef _AIX master = open("/dev/ptc", O_RDWR|O_NOCTTY); if (master < 0) return -1; buf = ttyname(master); if (!buf) return -1; slave = open(buf, O_RDWR|O_NOCTTY); if (slave < 0) return -1; #else master = open("/dev/ptmx", O_RDWR); if (master < 0) return -1; if (grantpt(master) < 0) return -1; if (unlockpt(master) < 0) return -1; buf = ptsname(master); if (!buf) return -1; slave = open(buf, O_RDWR|O_NOCTTY); if (slave < 0) return -1; #ifdef I_PUSH if (ioctl(slave, I_PUSH, "ptem") < 0) return -1; if (ioctl(slave, I_PUSH, "ldterm") < 0) return -1; #endif #endif *amaster = master; *aslave = slave; if (name) strcpy(name, buf); if (termp) tcsetattr(slave, TCSAFLUSH, termp); if (winp) ioctl(slave, TIOCSWINSZ, winp); return 0; } #else #error Do not know how to define openpty. #endif #endif #ifndef HAVE_FORKPTY #if defined(HAVE_OPENPTY) pid_t forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp) { pid_t pid; int master, slave; if (openpty(&master, &slave, name, termp, winp) < 0) return -1; *amaster = master; /* Fork off... */ pid = fork(); if (pid < 0) return -1; else if (pid == 0) { char *buf; int fd; setsid(); #ifdef TIOCSCTTY buf = NULL; if (ioctl(slave, TIOCSCTTY, NULL) < 0) _exit(1); #elif defined(_AIX) fd = open("/dev/tty", O_RDWR|O_NOCTTY); if (fd >= 0) { ioctl(fd, TIOCNOTTY, NULL); close(fd); } buf = ttyname(master); fd = open(buf, O_RDWR); close(fd); fd = open("/dev/tty", O_WRONLY); if (fd < 0) _exit(1); close(fd); if (termp && tcsetattr(slave, TCSAFLUSH, termp) == -1) _exit(1); if (ioctl(slave, TIOCSWINSZ, winp) == -1) _exit(1); #else buf = ptsname(master); fd = open(buf, O_RDWR); close(fd); #endif dup2(slave, 0); dup2(slave, 1); dup2(slave, 2); if (slave > 2) close(slave); close(master); return 0; } else { close(slave); return pid; } } #else #error Do not know how to define forkpty. #endif #endif