version 1.45, 2010/10/16 08:31:55 |
version 1.46, 2010/10/18 20:00:02 |
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#include <pwd.h> |
#include <pwd.h> |
#include <stdlib.h> |
#include <stdlib.h> |
#include <string.h> |
#include <string.h> |
#include <syslog.h> |
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#include <unistd.h> |
#include <unistd.h> |
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#include "tmux.h" |
#include "tmux.h" |
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struct event client_event; |
struct event client_event; |
const char *client_exitmsg; |
const char *client_exitmsg; |
int client_exitval; |
int client_exitval; |
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int client_attached; |
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int client_connect(char *, int); |
void client_send_identify(int); |
void client_send_identify(int); |
void client_send_environ(void); |
void client_send_environ(void); |
void client_write_server(enum msgtype, void *, size_t); |
void client_write_server(enum msgtype, void *, size_t); |
void client_update_event(void); |
void client_update_event(void); |
void client_signal(int, short, void *); |
void client_signal(int, short, void *); |
void client_callback(int, short, void *); |
void client_callback(int, short, void *); |
int client_dispatch(void); |
int client_dispatch_attached(void); |
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int client_dispatch_wait(void *); |
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struct imsgbuf * |
/* Connect client to server. */ |
client_init(char *path, int cmdflags, int flags) |
int |
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client_connect(char *path, int start_server) |
{ |
{ |
struct sockaddr_un sa; |
struct sockaddr_un sa; |
size_t size; |
size_t size; |
int fd, mode; |
int fd, mode; |
char rpathbuf[MAXPATHLEN]; |
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if (realpath(path, rpathbuf) == NULL) |
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strlcpy(rpathbuf, path, sizeof rpathbuf); |
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setproctitle("client (%s)", rpathbuf); |
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memset(&sa, 0, sizeof sa); |
memset(&sa, 0, sizeof sa); |
sa.sun_family = AF_UNIX; |
sa.sun_family = AF_UNIX; |
size = strlcpy(sa.sun_path, path, sizeof sa.sun_path); |
size = strlcpy(sa.sun_path, path, sizeof sa.sun_path); |
if (size >= sizeof sa.sun_path) { |
if (size >= sizeof sa.sun_path) { |
errno = ENAMETOOLONG; |
errno = ENAMETOOLONG; |
goto not_found; |
return (-1); |
} |
} |
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) |
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) |
fatal("socket failed"); |
fatal("socket failed"); |
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if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) { |
if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) { |
if (!(cmdflags & CMD_STARTSERVER)) |
if (!start_server) |
goto not_found; |
goto failed; |
switch (errno) { |
switch (errno) { |
case ECONNREFUSED: |
case ECONNREFUSED: |
if (unlink(path) != 0) |
if (unlink(path) != 0) |
goto not_found; |
goto failed; |
/* FALLTHROUGH */ |
/* FALLTHROUGH */ |
case ENOENT: |
case ENOENT: |
if ((fd = server_start(path)) == -1) |
if ((fd = server_start()) == -1) |
goto start_failed; |
goto failed; |
goto server_started; |
break; |
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default: |
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goto failed; |
} |
} |
goto not_found; |
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} |
} |
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server_started: |
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if ((mode = fcntl(fd, F_GETFL)) == -1) |
if ((mode = fcntl(fd, F_GETFL)) == -1) |
fatal("fcntl failed"); |
fatal("fcntl failed"); |
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1) |
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1) |
fatal("fcntl failed"); |
fatal("fcntl failed"); |
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return (fd); |
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failed: |
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close(fd); |
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return (-1); |
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} |
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/* Client main loop. */ |
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int |
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client_main(int argc, char **argv, int flags) |
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{ |
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struct cmd *cmd; |
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struct cmd_list *cmdlist; |
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struct msg_command_data cmddata; |
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int cmdflags, fd; |
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enum msgtype msg; |
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char *cause; |
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/* Set up the initial command. */ |
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cmdflags = 0; |
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if (shell_cmd != NULL) { |
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msg = MSG_SHELL; |
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cmdflags = CMD_STARTSERVER; |
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} else if (argc == 0) { |
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msg = MSG_COMMAND; |
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cmdflags = CMD_STARTSERVER|CMD_SENDENVIRON|CMD_CANTNEST; |
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} else { |
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msg = MSG_COMMAND; |
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/* |
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* It sucks parsing the command string twice (in client and |
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* later in server) but it is necessary to get the start server |
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* flag. |
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*/ |
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if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { |
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log_warnx("%s", cause); |
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return (1); |
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} |
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cmdflags &= ~CMD_STARTSERVER; |
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TAILQ_FOREACH(cmd, &cmdlist->list, qentry) { |
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if (cmd->entry->flags & CMD_STARTSERVER) |
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cmdflags |= CMD_STARTSERVER; |
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if (cmd->entry->flags & CMD_SENDENVIRON) |
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cmdflags |= CMD_SENDENVIRON; |
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if (cmd->entry->flags & CMD_CANTNEST) |
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cmdflags |= CMD_CANTNEST; |
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} |
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cmd_list_free(cmdlist); |
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} |
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/* |
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* Check if this could be a nested session, if the command can't nest: |
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* if the socket path matches $TMUX, this is probably the same server. |
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*/ |
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if (shell_cmd == NULL && environ_path != NULL && |
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cmdflags & CMD_CANTNEST && strcmp(socket_path, environ_path) == 0) { |
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log_warnx("sessions should be nested with care. " |
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"unset $TMUX to force."); |
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return (1); |
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} |
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/* Initialise the client socket and start the server. */ |
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fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER); |
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if (fd == -1) { |
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log_warn("failed to connect to server"); |
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return (1); |
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} |
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/* Set process title, log and signals now this is the client. */ |
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setproctitle("client (%s)", socket_path); |
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logfile("client"); |
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/* Create imsg. */ |
imsg_init(&client_ibuf, fd); |
imsg_init(&client_ibuf, fd); |
event_set(&client_event, fd, EV_READ, client_callback, NULL); |
event_set(&client_event, fd, EV_READ, client_callback, shell_cmd); |
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/* Establish signal handlers. */ |
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set_signals(client_signal); |
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/* Send initial environment. */ |
if (cmdflags & CMD_SENDENVIRON) |
if (cmdflags & CMD_SENDENVIRON) |
client_send_environ(); |
client_send_environ(); |
client_send_identify(flags); |
client_send_identify(flags); |
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return (&client_ibuf); |
/* Send first command. */ |
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if (msg == MSG_COMMAND) { |
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/* Fill in command line arguments. */ |
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cmddata.pid = environ_pid; |
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cmddata.idx = environ_idx; |
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start_failed: |
/* Prepare command for server. */ |
log_warnx("server failed to start"); |
cmddata.argc = argc; |
return (NULL); |
if (cmd_pack_argv( |
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argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { |
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log_warnx("command too long"); |
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return (1); |
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} |
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not_found: |
client_write_server(msg, &cmddata, sizeof cmddata); |
log_warn("server not found"); |
} else if (msg == MSG_SHELL) |
return (NULL); |
client_write_server(msg, NULL, 0); |
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/* Set the event and dispatch. */ |
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client_update_event(); |
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event_dispatch(); |
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/* Print the exit message, if any, and exit. */ |
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if (client_attached && client_exitmsg != NULL && !login_shell) |
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printf("[%s]\n", client_exitmsg); |
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return (client_exitval); |
} |
} |
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/* Send identify message to server with the file descriptors. */ |
void |
void |
client_send_identify(int flags) |
client_send_identify(int flags) |
{ |
{ |
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if ((fd = dup(STDOUT_FILENO)) == -1) |
if ((fd = dup(STDOUT_FILENO)) == -1) |
fatal("dup failed"); |
fatal("dup failed"); |
imsg_compose(&client_ibuf, MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0); |
imsg_compose(&client_ibuf, |
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MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0); |
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if ((fd = dup(STDERR_FILENO)) == -1) |
if ((fd = dup(STDERR_FILENO)) == -1) |
fatal("dup failed"); |
fatal("dup failed"); |
imsg_compose(&client_ibuf, MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0); |
imsg_compose(&client_ibuf, |
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MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0); |
} |
} |
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/* Forward entire environment to server. */ |
void |
void |
client_send_environ(void) |
client_send_environ(void) |
{ |
{ |
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} |
} |
} |
} |
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/* Write a message to the server without a file descriptor. */ |
void |
void |
client_write_server(enum msgtype type, void *buf, size_t len) |
client_write_server(enum msgtype type, void *buf, size_t len) |
{ |
{ |
imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len); |
imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len); |
} |
} |
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/* Update client event based on whether it needs to read or read and write. */ |
void |
void |
client_update_event(void) |
client_update_event(void) |
{ |
{ |
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events = EV_READ; |
events = EV_READ; |
if (client_ibuf.w.queued > 0) |
if (client_ibuf.w.queued > 0) |
events |= EV_WRITE; |
events |= EV_WRITE; |
event_set(&client_event, client_ibuf.fd, events, client_callback, NULL); |
event_set( |
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&client_event, client_ibuf.fd, events, client_callback, shell_cmd); |
event_add(&client_event, NULL); |
event_add(&client_event, NULL); |
} |
} |
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__dead void |
/* Callback to handle signals in the client. */ |
client_main(void) |
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{ |
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logfile("client"); |
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/* Note: event_init() has already been called. */ |
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/* Set up signals. */ |
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set_signals(client_signal); |
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/* |
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* Send a resize message immediately in case the terminal size has |
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* changed between the identify message to the server and the MSG_READY |
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* telling us to move into the client code. |
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*/ |
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client_write_server(MSG_RESIZE, NULL, 0); |
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/* |
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* imsg_read in the first client poll loop (before the terminal has |
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* been initialised) may have read messages into the buffer after the |
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* MSG_READY switched to here. Process anything outstanding now to |
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* avoid hanging waiting for messages that have already arrived. |
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*/ |
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if (client_dispatch() != 0) |
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goto out; |
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/* Set the event and dispatch. */ |
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client_update_event(); |
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event_dispatch(); |
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out: |
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/* Print the exit message, if any, and exit. */ |
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if (client_exitmsg != NULL && !login_shell) |
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printf("[%s]\n", client_exitmsg); |
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exit(client_exitval); |
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} |
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/* ARGSUSED */ |
/* ARGSUSED */ |
void |
void |
client_signal(int sig, unused short events, unused void *data) |
client_signal(int sig, unused short events, unused void *data) |
{ |
{ |
struct sigaction sigact; |
struct sigaction sigact; |
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int status; |
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switch (sig) { |
if (!client_attached) { |
case SIGHUP: |
switch (sig) { |
client_exitmsg = "lost tty"; |
case SIGCHLD: |
client_exitval = 1; |
waitpid(WAIT_ANY, &status, WNOHANG); |
client_write_server(MSG_EXITING, NULL, 0); |
break; |
break; |
case SIGTERM: |
case SIGTERM: |
event_loopexit(NULL); |
client_exitmsg = "terminated"; |
break; |
client_exitval = 1; |
} |
client_write_server(MSG_EXITING, NULL, 0); |
} else { |
break; |
switch (sig) { |
case SIGWINCH: |
case SIGHUP: |
client_write_server(MSG_RESIZE, NULL, 0); |
client_exitmsg = "lost tty"; |
break; |
client_exitval = 1; |
case SIGCONT: |
client_write_server(MSG_EXITING, NULL, 0); |
memset(&sigact, 0, sizeof sigact); |
break; |
sigemptyset(&sigact.sa_mask); |
case SIGTERM: |
sigact.sa_flags = SA_RESTART; |
client_exitmsg = "terminated"; |
sigact.sa_handler = SIG_IGN; |
client_exitval = 1; |
if (sigaction(SIGTSTP, &sigact, NULL) != 0) |
client_write_server(MSG_EXITING, NULL, 0); |
fatal("sigaction failed"); |
break; |
client_write_server(MSG_WAKEUP, NULL, 0); |
case SIGWINCH: |
break; |
client_write_server(MSG_RESIZE, NULL, 0); |
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break; |
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case SIGCONT: |
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memset(&sigact, 0, sizeof sigact); |
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sigemptyset(&sigact.sa_mask); |
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sigact.sa_flags = SA_RESTART; |
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sigact.sa_handler = SIG_IGN; |
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if (sigaction(SIGTSTP, &sigact, NULL) != 0) |
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fatal("sigaction failed"); |
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client_write_server(MSG_WAKEUP, NULL, 0); |
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break; |
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} |
} |
} |
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client_update_event(); |
client_update_event(); |
} |
} |
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/* Callback for client imsg read events. */ |
/* ARGSUSED */ |
/* ARGSUSED */ |
void |
void |
client_callback(unused int fd, short events, unused void *data) |
client_callback(unused int fd, short events, void *data) |
{ |
{ |
ssize_t n; |
ssize_t n; |
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int retval; |
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if (events & EV_READ) { |
if (events & EV_READ) { |
if ((n = imsg_read(&client_ibuf)) == -1 || n == 0) |
if ((n = imsg_read(&client_ibuf)) == -1 || n == 0) |
goto lost_server; |
goto lost_server; |
if (client_dispatch() != 0) { |
if (client_attached) |
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retval = client_dispatch_attached(); |
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else |
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retval = client_dispatch_wait(data); |
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if (retval != 0) { |
event_loopexit(NULL); |
event_loopexit(NULL); |
return; |
return; |
} |
} |
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event_loopexit(NULL); |
event_loopexit(NULL); |
} |
} |
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/* Dispatch imsgs when in wait state (before MSG_READY). */ |
int |
int |
client_dispatch(void) |
client_dispatch_wait(void *data) |
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{ |
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struct imsg imsg; |
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ssize_t n, datalen; |
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struct msg_shell_data shelldata; |
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struct msg_exit_data exitdata; |
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const char *shellcmd = data; |
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if ((n = imsg_read(&client_ibuf)) == -1 || n == 0) |
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fatalx("imsg_read failed"); |
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for (;;) { |
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if ((n = imsg_get(&client_ibuf, &imsg)) == -1) |
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fatalx("imsg_get failed"); |
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if (n == 0) |
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return (0); |
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datalen = imsg.hdr.len - IMSG_HEADER_SIZE; |
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switch (imsg.hdr.type) { |
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case MSG_EXIT: |
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case MSG_SHUTDOWN: |
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if (datalen != sizeof exitdata) { |
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if (datalen != 0) |
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fatalx("bad MSG_EXIT size"); |
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} else { |
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memcpy(&exitdata, imsg.data, sizeof exitdata); |
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client_exitval = exitdata.retcode; |
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} |
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imsg_free(&imsg); |
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return (-1); |
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case MSG_READY: |
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if (datalen != 0) |
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fatalx("bad MSG_READY size"); |
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client_attached = 1; |
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break; |
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case MSG_VERSION: |
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if (datalen != 0) |
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fatalx("bad MSG_VERSION size"); |
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log_warnx("protocol version mismatch (client %u, " |
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"server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); |
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client_exitval = 1; |
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imsg_free(&imsg); |
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return (-1); |
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case MSG_SHELL: |
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if (datalen != sizeof shelldata) |
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fatalx("bad MSG_SHELL size"); |
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memcpy(&shelldata, imsg.data, sizeof shelldata); |
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shelldata.shell[(sizeof shelldata.shell) - 1] = '\0'; |
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clear_signals(0); |
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shell_exec(shelldata.shell, shellcmd); |
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/* NOTREACHED */ |
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default: |
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fatalx("unexpected message"); |
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} |
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imsg_free(&imsg); |
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} |
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} |
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/* Dispatch imsgs in attached state (after MSG_READY). */ |
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/* ARGSUSED */ |
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int |
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client_dispatch_attached(void) |
{ |
{ |
struct imsg imsg; |
struct imsg imsg; |
struct msg_lock_data lockdata; |
struct msg_lock_data lockdata; |