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terminal: non-functional changes

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-02-28 13:02:05 +01:00
parent d712f9e8f4
commit e9a55b51b8
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GPG Key ID: 8EB056D53EECB12D
2 changed files with 99 additions and 91 deletions
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24
src/lxc/terminal.c
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@ -1162,22 +1162,22 @@ int lxc_terminal_prepare_login(int fd)
return 0; return 0;
} }
void lxc_terminal_info_init(struct lxc_terminal_info *pty) void lxc_terminal_info_init(struct lxc_terminal_info *terminal)
{ {
pty->name[0] = '\0'; terminal->name[0] = '\0';
pty->master = -EBADF; terminal->master = -EBADF;
pty->slave = -EBADF; terminal->slave = -EBADF;
pty->busy = -1; terminal->busy = -1;
} }
void lxc_terminal_init(struct lxc_terminal *pty) void lxc_terminal_init(struct lxc_terminal *terminal)
{ {
memset(pty, 0, sizeof(*pty)); memset(terminal, 0, sizeof(*terminal));
pty->slave = -EBADF; terminal->slave = -EBADF;
pty->master = -EBADF; terminal->master = -EBADF;
pty->peer = -EBADF; terminal->peer = -EBADF;
pty->log_fd = -EBADF; terminal->log_fd = -EBADF;
lxc_terminal_info_init(&pty->proxy); lxc_terminal_info_init(&terminal->proxy);
} }
void lxc_terminal_conf_free(struct lxc_terminal *terminal) void lxc_terminal_conf_free(struct lxc_terminal *terminal)

166
src/lxc/terminal.h
View File

@ -21,8 +21,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#ifndef __LXC_CONSOLE_H #ifndef __LXC_TERMINAL_H
#define __LXC_CONSOLE_H #define __LXC_TERMINAL_H
#include "config.h" #include "config.h"
@ -36,15 +36,17 @@ struct lxc_container;
struct lxc_conf; struct lxc_conf;
struct lxc_epoll_descr; struct lxc_epoll_descr;
/* Defines a structure containing a pty information for virtualizing a tty
* @name : the path name of the slave pty side
* @master : the file descriptor of the master
* @slave : the file descriptor of the slave
*/
struct lxc_terminal_info { struct lxc_terminal_info {
/* the path name of the slave side */
char name[MAXPATHLEN]; char name[MAXPATHLEN];
/* the file descriptor of the master */
int master; int master;
/* the file descriptor of the slave */
int slave; int slave;
/* whether the terminal is currently used */
int busy; int busy;
}; };
@ -53,25 +55,32 @@ struct lxc_terminal_state {
int stdinfd; int stdinfd;
int stdoutfd; int stdoutfd;
int masterfd; int masterfd;
/* Escape sequence to use for exiting the pty. A single char can be
* specified. The pty can then exited by doing: Ctrl + specified_char + /* Escape sequence to use for exiting the terminal. A single char can
* q. This field is checked by lxc_terminal_stdin_cb(). Set to -1 to * be specified. The terminal can then exited by doing: Ctrl +
* disable exiting the pty via a escape sequence. * specified_char + q. This field is checked by
* lxc_terminal_stdin_cb(). Set to -1 to disable exiting the terminal
* via a escape sequence.
*/ */
int escape; int escape;
/* Used internally by lxc_terminal_stdin_cb() to check whether an /* Used internally by lxc_terminal_stdin_cb() to check whether an
* escape sequence has been received. * escape sequence has been received.
*/ */
int saw_escape; int saw_escape;
/* Name of the container to forward the SIGWINCH event to. */ /* Name of the container to forward the SIGWINCH event to. */
const char *winch_proxy; const char *winch_proxy;
/* Path of the container to forward the SIGWINCH event to. */ /* Path of the container to forward the SIGWINCH event to. */
const char *winch_proxy_lxcpath; const char *winch_proxy_lxcpath;
/* File descriptor that accepts signals. If set to -1 no signal handler /* File descriptor that accepts signals. If set to -1 no signal handler
* could be installed. This also means that the sigset_t oldmask member * could be installed. This also means that the sigset_t oldmask member
* is meaningless. * is meaningless.
*/ */
int sigfd; int sigfd;
sigset_t oldmask; sigset_t oldmask;
}; };
@ -86,7 +95,7 @@ struct lxc_terminal {
struct termios *tios; struct termios *tios;
struct lxc_terminal_state *tty_state; struct lxc_terminal_state *tty_state;
struct /* lxc_console_log */ { struct /* lxc_terminal_log */ {
/* size of the log file */ /* size of the log file */
uint64_t log_size; uint64_t log_size;
@ -109,7 +118,7 @@ struct lxc_terminal {
}; };
}; };
/* /**
* lxc_terminal_allocate: allocate the console or a tty * lxc_terminal_allocate: allocate the console or a tty
* *
* @conf : the configuration of the container to allocate from * @conf : the configuration of the container to allocate from
@ -119,61 +128,54 @@ struct lxc_terminal {
*/ */
extern int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttynum); extern int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttynum);
/* /**
* Create a new pty: * Create a new terminal:
* - calls openpty() to allocate a master/slave pty pair * - calls openpty() to allocate a master/slave pair
* - sets the FD_CLOEXEC flag on the master/slave fds * - sets the FD_CLOEXEC flag on the master/slave fds
* - allocates either the current controlling pty (default) or a user specified * - allocates either the current controlling terminal (default) or a user
* pty as peer pty for the newly created master/slave pair * specified terminal as proxy for the newly created master/slave pair
* - sets up SIGWINCH handler, winsz, and new terminal settings * - sets up SIGWINCH handler, winsz, and new terminal settings
* (Handlers for SIGWINCH and I/O are not registered in a mainloop.) * (Handlers for SIGWINCH and I/O are not registered in a mainloop.)
* (For an unprivileged container the created pty on the host is not
* automatically chowned to the uid/gid of the unprivileged user. For this
* ttys_shift_ids() can be called.)
*/ */
extern int lxc_terminal_create(struct lxc_terminal *console); extern int lxc_terminal_create(struct lxc_terminal *console);
/** /**
* lxc_terminal_setup: Create a new pty. * lxc_terminal_setup: Create a new terminal.
* - In addition to lxc_terminal_create() also sets up all pty logs. * - In addition to lxc_terminal_create() also sets up logging.
*/ */
extern int lxc_terminal_setup(struct lxc_conf *); extern int lxc_terminal_setup(struct lxc_conf *);
/* /**
* Delete a pty created via lxc_terminal_setup(): * Delete a terminal created via lxc_terminal_create() or lxc_terminal_setup():
* - set old terminal settings * Note, registered handlers are not automatically deleted.
* - memory allocated via lxc_terminal_setup() is free()ed.
* - close master/slave pty pair and allocated fd for the peer (usually
* /dev/tty)
* Registered handlers in a mainloop are not automatically deleted.
*/ */
extern void lxc_terminal_delete(struct lxc_terminal *); extern void lxc_terminal_delete(struct lxc_terminal *);
/* /**
* lxc_terminal_free: mark the console or a tty as unallocated, free any * lxc_terminal_free: mark the terminal as unallocated and free any resources
* resources allocated by lxc_terminal_allocate(). * allocated by lxc_terminal_allocate().
* *
* @conf : the configuration of the container whose tty was closed * @conf : the configuration of the container whose tty was closed
* @fd : the socket fd whose remote side was closed, which indicated * @fd : the socket fd whose remote side was closed, which indicated
* the console or tty is no longer in use. this is used to match * the terminal is no longer in use. this is used to match
* which console/tty is being freed. * which terminal is being freed.
*/ */
extern void lxc_terminal_free(struct lxc_conf *conf, int fd); extern void lxc_terminal_free(struct lxc_conf *conf, int fd);
/* /**
* Register pty event handlers in an open mainloop * Register terminal event handlers in an open mainloop.
*/ */
extern int lxc_terminal_mainloop_add(struct lxc_epoll_descr *, struct lxc_terminal *); extern int lxc_terminal_mainloop_add(struct lxc_epoll_descr *, struct lxc_terminal *);
/* /**
* Handle SIGWINCH events on the allocated ptys. * Handle SIGWINCH events on the allocated terminals.
*/ */
extern void lxc_terminal_sigwinch(int sig); extern void lxc_terminal_sigwinch(int sig);
/* /**
* Connect to one of the ptys given to the container via lxc.tty.max. * Connect to one of the ttys given to the container via lxc.tty.max.
* - allocates either the current controlling pty (default) or a user specified * - allocates either the current controlling terminal (default) or a user specified
* pty as peer pty for the containers tty * terminal as proxy terminal for the containers tty
* - sets up SIGWINCH handler, winsz, and new terminal settings * - sets up SIGWINCH handler, winsz, and new terminal settings
* - opens mainloop * - opens mainloop
* - registers SIGWINCH, I/O handlers in the mainloop * - registers SIGWINCH, I/O handlers in the mainloop
@ -183,24 +185,24 @@ extern int lxc_console(struct lxc_container *c, int ttynum,
int stdinfd, int stdoutfd, int stderrfd, int stdinfd, int stdoutfd, int stderrfd,
int escape); int escape);
/* /**
* Allocate one of the ptys given to the container via lxc.tty.max. Returns an * Allocate one of the tty given to the container via lxc.tty.max. Returns an
* open fd to the allocated pty. * open fd to the allocated tty.
* Set ttynum to -1 to allocate the first available pty, or to a value within * Set ttynum to -1 to allocate the first available tty, or to a value within
* the range specified by lxc.tty.max to allocate a specific pty. * the range specified by lxc.tty.max to allocate a specific tty.
*/ */
extern int lxc_terminal_getfd(struct lxc_container *c, int *ttynum, extern int lxc_terminal_getfd(struct lxc_container *c, int *ttynum,
int *masterfd); int *masterfd);
/* /**
* Make fd a duplicate of the standard file descriptors: * Make fd a duplicate of the standard file descriptors. The fd is made a
* fd is made a duplicate of a specific standard file descriptor iff the * duplicate of a specific standard file descriptor iff the standard file
* standard file descriptor refers to a pty. * descriptor refers to a terminal.
*/ */
extern int lxc_terminal_set_stdfds(int fd); extern int lxc_terminal_set_stdfds(int fd);
/* /**
* Handler for events on the stdin fd of the pty. To be registered via the * Handler for events on the stdin fd of the terminal. To be registered via the
* corresponding functions declared and defined in mainloop.{c,h} or * corresponding functions declared and defined in mainloop.{c,h} or
* lxc_terminal_mainloop_add(). * lxc_terminal_mainloop_add().
* This function exits the loop cleanly when an EPOLLHUP event is received. * This function exits the loop cleanly when an EPOLLHUP event is received.
@ -208,42 +210,46 @@ extern int lxc_terminal_set_stdfds(int fd);
extern int lxc_terminal_stdin_cb(int fd, uint32_t events, void *cbdata, extern int lxc_terminal_stdin_cb(int fd, uint32_t events, void *cbdata,
struct lxc_epoll_descr *descr); struct lxc_epoll_descr *descr);
/* /**
* Handler for events on the master fd of the pty. To be registered via the * Handler for events on the master fd of the terminal. To be registered via
* corresponding functions declared and defined in mainloop.{c,h} or * the corresponding functions declared and defined in mainloop.{c,h} or
* lxc_terminal_mainloop_add(). * lxc_terminal_mainloop_add().
* This function exits the loop cleanly when an EPOLLHUP event is received. * This function exits the loop cleanly when an EPOLLHUP event is received.
*/ */
extern int lxc_terminal_master_cb(int fd, uint32_t events, void *cbdata, extern int lxc_terminal_master_cb(int fd, uint32_t events, void *cbdata,
struct lxc_epoll_descr *descr); struct lxc_epoll_descr *descr);
/* /**
* Setup new terminal properties. The old terminal settings are stored in * Setup new terminal properties. The old terminal settings are stored in
* oldtios. * oldtios.
*/ */
extern int lxc_setup_tios(int fd, struct termios *oldtios); extern int lxc_setup_tios(int fd, struct termios *oldtios);
/* /**
* lxc_terminal_winsz: propagate winsz from one terminal to another * lxc_terminal_winsz: propagate winsz from one terminal to another
* *
* @srcfd : terminal to get size from (typically a slave pty) * @srcfd
* @dstfd : terminal to set size on (typically a master pty) * - terminal to get size from (typically a slave pty)
* @dstfd
* - terminal to set size on (typically a master pty)
*/ */
extern void lxc_terminal_winsz(int srcfd, int dstfd); extern void lxc_terminal_winsz(int srcfd, int dstfd);
/* /*
* lxc_terminal_signal_init: install signal handler * lxc_terminal_signal_init: install signal handler
* *
* @srcfd : src for winsz in SIGWINCH handler * @srcfd
* @dstfd : dst for winsz in SIGWINCH handler * - src for winsz in SIGWINCH handler
* @dstfd
* - dst for winsz in SIGWINCH handler
* *
* Returns lxc_terminal_state structure on success or NULL on failure. The sigfd * Returns lxc_terminal_state structure on success or NULL on failure. The
* member of the returned lxc_terminal_state can be select()/poll()ed/epoll()ed * sigfd member of the returned lxc_terminal_state can be
* on (ie added to a mainloop) for signals. * select()/poll()ed/epoll()ed on (i.e. added to a mainloop) for signals.
* *
* Must be called with process_lock held to protect the lxc_ttys list, or * Must be called with process_lock held to protect the lxc_ttys list, or from
* from a non-threaded context. * a non-threaded context.
* *
* Note that the signal handler isn't installed as a classic asychronous * Note that the signal handler isn't installed as a classic asychronous
* handler, rather signalfd(2) is used so that we can handle the signal when * handler, rather signalfd(2) is used so that we can handle the signal when
@ -256,17 +262,18 @@ extern void lxc_terminal_winsz(int srcfd, int dstfd);
*/ */
extern struct lxc_terminal_state *lxc_terminal_signal_init(int srcfd, int dstfd); extern struct lxc_terminal_state *lxc_terminal_signal_init(int srcfd, int dstfd);
/* /**
* Handler for signal events. To be registered via the corresponding functions * Handler for signal events. To be registered via the corresponding functions
* declared and defined in mainloop.{c,h} or lxc_terminal_mainloop_add(). * declared and defined in mainloop.{c,h} or lxc_terminal_mainloop_add().
*/ */
extern int lxc_terminal_signalfd_cb(int fd, uint32_t events, void *cbdata, extern int lxc_terminal_signalfd_cb(int fd, uint32_t events, void *cbdata,
struct lxc_epoll_descr *descr); struct lxc_epoll_descr *descr);
/* /**
* lxc_terminal_signal_fini: uninstall signal handler * lxc_terminal_signal_fini: uninstall signal handler
* *
* @ts : the lxc_terminal_state returned by lxc_terminal_signal_init * @ts
* - the lxc_terminal_state returned by lxc_terminal_signal_init
* *
* Restore the saved signal handler that was in effect at the time * Restore the saved signal handler that was in effect at the time
* lxc_terminal_signal_init() was called. * lxc_terminal_signal_init() was called.
@ -276,16 +283,17 @@ extern int lxc_terminal_signalfd_cb(int fd, uint32_t events, void *cbdata,
*/ */
extern void lxc_terminal_signal_fini(struct lxc_terminal_state *ts); extern void lxc_terminal_signal_fini(struct lxc_terminal_state *ts);
extern int lxc_terminal_write_ringbuffer(struct lxc_terminal *console); extern int lxc_terminal_write_ringbuffer(struct lxc_terminal *terminal);
extern int lxc_terminal_create_log_file(struct lxc_terminal *console); extern int lxc_terminal_create_log_file(struct lxc_terminal *terminal);
extern int lxc_terminal_io_cb(int fd, uint32_t events, void *data, extern int lxc_terminal_io_cb(int fd, uint32_t events, void *data,
struct lxc_epoll_descr *descr); struct lxc_epoll_descr *descr);
extern int lxc_make_controlling_terminal(int fd); extern int lxc_make_controlling_terminal(int fd);
extern int lxc_terminal_prepare_login(int fd); extern int lxc_terminal_prepare_login(int fd);
extern void lxc_terminal_conf_free(struct lxc_terminal *console); extern void lxc_terminal_conf_free(struct lxc_terminal *terminal);
extern void lxc_terminal_info_init(struct lxc_terminal_info *pty); extern void lxc_terminal_info_init(struct lxc_terminal_info *terminal);
extern void lxc_terminal_init(struct lxc_terminal *pty); extern void lxc_terminal_init(struct lxc_terminal *terminal);
extern int lxc_terminal_map_ids(struct lxc_conf *c, struct lxc_terminal *pty); extern int lxc_terminal_map_ids(struct lxc_conf *c,
struct lxc_terminal *terminal);
#endif #endif /* __LXC_TERMINAL_H */