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Move file handling protocol stuff all into file.c so it can be reused

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more easily.
This commit is contained in:
nicm
2021-02-11 08:28:45 +00:00
parent 32186950f5
commit e40831a002
4 changed files with 445 additions and 356 deletions
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273
client.c
View File

@@ -477,257 +477,6 @@ client_send_identify(const char *ttynam, const char *cwd, int feat)
proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
}
/* File write error callback. */
static void
client_write_error_callback(__unused struct bufferevent *bev,
__unused short what, void *arg)
{
struct client_file *cf = arg;
log_debug("write error file %d", cf->stream);
bufferevent_free(cf->event);
cf->event = NULL;
close(cf->fd);
cf->fd = -1;
if (client_exitflag)
client_exit();
}
/* File write callback. */
static void
client_write_callback(__unused struct bufferevent *bev, void *arg)
{
struct client_file *cf = arg;
if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
bufferevent_free(cf->event);
close(cf->fd);
RB_REMOVE(client_files, &client_files, cf);
file_free(cf);
}
if (client_exitflag)
client_exit();
}
/* Open write file. */
static void
client_write_open(void *data, size_t datalen)
{
struct msg_write_open *msg = data;
const char *path;
struct msg_write_ready reply;
struct client_file find, *cf;
const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
int error = 0;
if (datalen < sizeof *msg)
fatalx("bad MSG_WRITE_OPEN size");
if (datalen == sizeof *msg)
path = "-";
else
path = (const char *)(msg + 1);
log_debug("open write file %d %s", msg->stream, path);
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
cf = file_create(NULL, msg->stream, NULL, NULL);
RB_INSERT(client_files, &client_files, cf);
} else {
error = EBADF;
goto reply;
}
if (cf->closed) {
error = EBADF;
goto reply;
}
cf->fd = -1;
if (msg->fd == -1)
cf->fd = open(path, msg->flags|flags, 0644);
else {
if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
errno = EBADF;
else {
cf->fd = dup(msg->fd);
if (~client_flags & CLIENT_CONTROL)
close(msg->fd); /* can only be used once */
}
}
if (cf->fd == -1) {
error = errno;
goto reply;
}
cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
client_write_error_callback, cf);
bufferevent_enable(cf->event, EV_WRITE);
goto reply;
reply:
reply.stream = msg->stream;
reply.error = error;
proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
}
/* Write to client file. */
static void
client_write_data(void *data, size_t datalen)
{
struct msg_write_data *msg = data;
struct client_file find, *cf;
size_t size = datalen - sizeof *msg;
if (datalen < sizeof *msg)
fatalx("bad MSG_WRITE size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
fatalx("unknown stream number");
log_debug("write %zu to file %d", size, cf->stream);
if (cf->event != NULL)
bufferevent_write(cf->event, msg + 1, size);
}
/* Close client file. */
static void
client_write_close(void *data, size_t datalen)
{
struct msg_write_close *msg = data;
struct client_file find, *cf;
if (datalen != sizeof *msg)
fatalx("bad MSG_WRITE_CLOSE size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
fatalx("unknown stream number");
log_debug("close file %d", cf->stream);
if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
if (cf->event != NULL)
bufferevent_free(cf->event);
if (cf->fd != -1)
close(cf->fd);
RB_REMOVE(client_files, &client_files, cf);
file_free(cf);
}
}
/* File read callback. */
static void
client_read_callback(__unused struct bufferevent *bev, void *arg)
{
struct client_file *cf = arg;
void *bdata;
size_t bsize;
struct msg_read_data *msg;
size_t msglen;
msg = xmalloc(sizeof *msg);
for (;;) {
bdata = EVBUFFER_DATA(cf->event->input);
bsize = EVBUFFER_LENGTH(cf->event->input);
if (bsize == 0)
break;
if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
log_debug("read %zu from file %d", bsize, cf->stream);
msglen = (sizeof *msg) + bsize;
msg = xrealloc(msg, msglen);
msg->stream = cf->stream;
memcpy(msg + 1, bdata, bsize);
proc_send(client_peer, MSG_READ, -1, msg, msglen);
evbuffer_drain(cf->event->input, bsize);
}
free(msg);
}
/* File read error callback. */
static void
client_read_error_callback(__unused struct bufferevent *bev,
__unused short what, void *arg)
{
struct client_file *cf = arg;
struct msg_read_done msg;
log_debug("read error file %d", cf->stream);
msg.stream = cf->stream;
msg.error = 0;
proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
bufferevent_free(cf->event);
close(cf->fd);
RB_REMOVE(client_files, &client_files, cf);
file_free(cf);
}
/* Open read file. */
static void
client_read_open(void *data, size_t datalen)
{
struct msg_read_open *msg = data;
const char *path;
struct msg_read_done reply;
struct client_file find, *cf;
const int flags = O_NONBLOCK|O_RDONLY;
int error;
if (datalen < sizeof *msg)
fatalx("bad MSG_READ_OPEN size");
if (datalen == sizeof *msg)
path = "-";
else
path = (const char *)(msg + 1);
log_debug("open read file %d %s", msg->stream, path);
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
cf = file_create(NULL, msg->stream, NULL, NULL);
RB_INSERT(client_files, &client_files, cf);
} else {
error = EBADF;
goto reply;
}
if (cf->closed) {
error = EBADF;
goto reply;
}
cf->fd = -1;
if (msg->fd == -1)
cf->fd = open(path, flags);
else {
if (msg->fd != STDIN_FILENO)
errno = EBADF;
else {
cf->fd = dup(msg->fd);
if (~client_flags & CLIENT_CONTROL)
close(msg->fd); /* can only be used once */
}
}
if (cf->fd == -1) {
error = errno;
goto reply;
}
cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
client_read_error_callback, cf);
bufferevent_enable(cf->event, EV_READ);
return;
reply:
reply.stream = msg->stream;
reply.error = error;
proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
}
/* Run command in shell; used for -c. */
static __dead void
client_exec(const char *shell, const char *shellcmd)
@@ -802,6 +551,16 @@ client_signal(int sig)
}
}
/* Callback for file write error or close. */
static void
client_file_check_cb(__unused struct client *c, __unused const char *path,
__unused int error, __unused int closed, __unused struct evbuffer *buffer,
__unused void *data)
{
if (client_exitflag)
client_exit();
}
/* Callback for client read events. */
static void
client_dispatch(struct imsg *imsg, __unused void *arg)
@@ -916,16 +675,20 @@ client_dispatch_wait(struct imsg *imsg)
proc_exit(client_proc);
break;
case MSG_READ_OPEN:
client_read_open(data, datalen);
file_read_open(&client_files, client_peer, imsg, 1,
!(client_flags & CLIENT_CONTROL), client_file_check_cb,
NULL);
break;
case MSG_WRITE_OPEN:
client_write_open(data, datalen);
file_write_open(&client_files, client_peer, imsg, 1,
!(client_flags & CLIENT_CONTROL), client_file_check_cb,
NULL);
break;
case MSG_WRITE:
client_write_data(data, datalen);
file_write_data(&client_files, imsg);
break;
case MSG_WRITE_CLOSE:
client_write_close(data, datalen);
file_write_close(&client_files, imsg);
break;
case MSG_OLDSTDERR:
case MSG_OLDSTDIN:

434
file.c
View File

@@ -30,10 +30,17 @@
#include "tmux.h"
/*
* IPC file handling. Both client and server use the same data structures
* (client_file and client_files) to store list of active files. Most functions
* are for use either in client or server but not both.
*/
static int file_next_stream = 3;
RB_GENERATE(client_files, client_file, entry, file_cmp);
/* Get path for file, either as given or from working directory. */
static char *
file_get_path(struct client *c, const char *file)
{
@@ -46,6 +53,7 @@ file_get_path(struct client *c, const char *file)
return (path);
}
/* Tree comparison function. */
int
file_cmp(struct client_file *cf1, struct client_file *cf2)
{
@@ -56,11 +64,47 @@ file_cmp(struct client_file *cf1, struct client_file *cf2)
return (0);
}
/*
* Create a file object in the client process - the peer is the server to send
* messages to. Check callback is fired when the file is finished with so the
* process can decide if it needs to exit (if it is waiting for files to
* flush).
*/
struct client_file *
file_create(struct client *c, int stream, client_file_cb cb, void *cbdata)
file_create_with_peer(struct tmuxpeer *peer, struct client_files *files,
int stream, client_file_cb cb, void *cbdata)
{
struct client_file *cf;
cf = xcalloc(1, sizeof *cf);
cf->c = NULL;
cf->references = 1;
cf->stream = stream;
cf->buffer = evbuffer_new();
if (cf->buffer == NULL)
fatalx("out of memory");
cf->cb = cb;
cf->data = cbdata;
cf->peer = peer;
cf->tree = files;
RB_INSERT(client_files, files, cf);
return (cf);
}
/* Create a file object in the server, communicating with the given client. */
struct client_file *
file_create_with_client(struct client *c, int stream, client_file_cb cb,
void *cbdata)
{
struct client_file *cf;
if (c != NULL && (c->flags & CLIENT_ATTACHED))
c = NULL;
cf = xcalloc(1, sizeof *cf);
cf->c = c;
cf->references = 1;
@@ -74,6 +118,8 @@ file_create(struct client *c, int stream, client_file_cb cb, void *cbdata)
cf->data = cbdata;
if (cf->c != NULL) {
cf->peer = cf->c->peer;
cf->tree = &cf->c->files;
RB_INSERT(client_files, &cf->c->files, cf);
cf->c->references++;
}
@@ -81,6 +127,7 @@ file_create(struct client *c, int stream, client_file_cb cb, void *cbdata)
return (cf);
}
/* Free a file. */
void
file_free(struct client_file *cf)
{
@@ -90,13 +137,15 @@ file_free(struct client_file *cf)
evbuffer_free(cf->buffer);
free(cf->path);
if (cf->c != NULL) {
RB_REMOVE(client_files, &cf->c->files, cf);
if (cf->tree != NULL)
RB_REMOVE(client_files, cf->tree, cf);
if (cf->c != NULL)
server_client_unref(cf->c);
}
free(cf);
}
/* Event to fire the done callback. */
static void
file_fire_done_cb(__unused int fd, __unused short events, void *arg)
{
@@ -108,21 +157,22 @@ file_fire_done_cb(__unused int fd, __unused short events, void *arg)
file_free(cf);
}
/* Add an event to fire the done callback (used by the server). */
void
file_fire_done(struct client_file *cf)
{
event_once(-1, EV_TIMEOUT, file_fire_done_cb, cf, NULL);
}
/* Fire the read callback. */
void
file_fire_read(struct client_file *cf)
{
struct client *c = cf->c;
if (cf->cb != NULL)
cf->cb(c, cf->path, cf->error, 0, cf->buffer, cf->data);
cf->cb(cf->c, cf->path, cf->error, 0, cf->buffer, cf->data);
}
/* Can this file be printed to? */
int
file_can_print(struct client *c)
{
@@ -133,6 +183,7 @@ file_can_print(struct client *c)
return (1);
}
/* Print a message to a file. */
void
file_print(struct client *c, const char *fmt, ...)
{
@@ -143,6 +194,7 @@ file_print(struct client *c, const char *fmt, ...)
va_end(ap);
}
/* Print a message to a file. */
void
file_vprint(struct client *c, const char *fmt, va_list ap)
{
@@ -154,7 +206,7 @@ file_vprint(struct client *c, const char *fmt, va_list ap)
find.stream = 1;
if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL) {
cf = file_create(c, 1, NULL, NULL);
cf = file_create_with_client(c, 1, NULL, NULL);
cf->path = xstrdup("-");
evbuffer_add_vprintf(cf->buffer, fmt, ap);
@@ -169,6 +221,7 @@ file_vprint(struct client *c, const char *fmt, va_list ap)
}
}
/* Print a buffer to a file. */
void
file_print_buffer(struct client *c, void *data, size_t size)
{
@@ -180,7 +233,7 @@ file_print_buffer(struct client *c, void *data, size_t size)
find.stream = 1;
if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL) {
cf = file_create(c, 1, NULL, NULL);
cf = file_create_with_client(c, 1, NULL, NULL);
cf->path = xstrdup("-");
evbuffer_add(cf->buffer, data, size);
@@ -195,6 +248,7 @@ file_print_buffer(struct client *c, void *data, size_t size)
}
}
/* Report an error to a file. */
void
file_error(struct client *c, const char *fmt, ...)
{
@@ -209,7 +263,7 @@ file_error(struct client *c, const char *fmt, ...)
find.stream = 2;
if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL) {
cf = file_create(c, 2, NULL, NULL);
cf = file_create_with_client(c, 2, NULL, NULL);
cf->path = xstrdup("-");
evbuffer_add_vprintf(cf->buffer, fmt, ap);
@@ -226,19 +280,21 @@ file_error(struct client *c, const char *fmt, ...)
va_end(ap);
}
/* Write data to a file. */
void
file_write(struct client *c, const char *path, int flags, const void *bdata,
size_t bsize, client_file_cb cb, void *cbdata)
{
struct client_file *cf;
FILE *f;
struct msg_write_open *msg;
size_t msglen;
int fd = -1;
u_int stream = file_next_stream++;
FILE *f;
const char *mode;
if (strcmp(path, "-") == 0) {
cf = file_create(c, file_next_stream++, cb, cbdata);
cf = file_create_with_client(c, stream, cb, cbdata);
cf->path = xstrdup("-");
fd = STDOUT_FILENO;
@@ -251,7 +307,7 @@ file_write(struct client *c, const char *path, int flags, const void *bdata,
goto skip;
}
cf = file_create(c, file_next_stream++, cb, cbdata);
cf = file_create_with_client(c, stream, cb, cbdata);
cf->path = file_get_path(c, path);
if (c == NULL || c->flags & CLIENT_ATTACHED) {
@@ -286,7 +342,7 @@ skip:
msg->fd = fd;
msg->flags = flags;
memcpy(msg + 1, cf->path, msglen - sizeof *msg);
if (proc_send(c->peer, MSG_WRITE_OPEN, -1, msg, msglen) != 0) {
if (proc_send(cf->peer, MSG_WRITE_OPEN, -1, msg, msglen) != 0) {
free(msg);
cf->error = EINVAL;
goto done;
@@ -298,18 +354,21 @@ done:
file_fire_done(cf);
}
/* Read a file. */
void
file_read(struct client *c, const char *path, client_file_cb cb, void *cbdata)
{
struct client_file *cf;
FILE *f;
struct msg_read_open *msg;
size_t msglen, size;
size_t msglen;
int fd = -1;
u_int stream = file_next_stream++;
FILE *f;
size_t size;
char buffer[BUFSIZ];
if (strcmp(path, "-") == 0) {
cf = file_create(c, file_next_stream++, cb, cbdata);
cf = file_create_with_client(c, stream, cb, cbdata);
cf->path = xstrdup("-");
fd = STDIN_FILENO;
@@ -322,7 +381,7 @@ file_read(struct client *c, const char *path, client_file_cb cb, void *cbdata)
goto skip;
}
cf = file_create(c, file_next_stream++, cb, cbdata);
cf = file_create_with_client(c, stream, cb, cbdata);
cf->path = file_get_path(c, path);
if (c == NULL || c->flags & CLIENT_ATTACHED) {
@@ -358,7 +417,7 @@ skip:
msg->stream = cf->stream;
msg->fd = fd;
memcpy(msg + 1, cf->path, msglen - sizeof *msg);
if (proc_send(c->peer, MSG_READ_OPEN, -1, msg, msglen) != 0) {
if (proc_send(cf->peer, MSG_READ_OPEN, -1, msg, msglen) != 0) {
free(msg);
cf->error = EINVAL;
goto done;
@@ -370,21 +429,21 @@ done:
file_fire_done(cf);
}
/* Push event, fired if there is more writing to be done. */
static void
file_push_cb(__unused int fd, __unused short events, void *arg)
{
struct client_file *cf = arg;
struct client *c = cf->c;
if (~c->flags & CLIENT_DEAD)
if (cf->c == NULL || ~cf->c->flags & CLIENT_DEAD)
file_push(cf);
file_free(cf);
}
/* Push uwritten data to the client for a file, if it will accept it. */
void
file_push(struct client_file *cf)
{
struct client *c = cf->c;
struct msg_write_data *msg;
size_t msglen, sent, left;
struct msg_write_close close;
@@ -400,21 +459,344 @@ file_push(struct client_file *cf)
msg = xrealloc(msg, msglen);
msg->stream = cf->stream;
memcpy(msg + 1, EVBUFFER_DATA(cf->buffer), sent);
if (proc_send(c->peer, MSG_WRITE, -1, msg, msglen) != 0)
if (proc_send(cf->peer, MSG_WRITE, -1, msg, msglen) != 0)
break;
evbuffer_drain(cf->buffer, sent);
left = EVBUFFER_LENGTH(cf->buffer);
log_debug("%s: file %d sent %zu, left %zu", c->name, cf->stream,
sent, left);
log_debug("file %d sent %zu, left %zu", cf->stream, sent, left);
}
if (left != 0) {
cf->references++;
event_once(-1, EV_TIMEOUT, file_push_cb, cf, NULL);
} else if (cf->stream > 2) {
close.stream = cf->stream;
proc_send(c->peer, MSG_WRITE_CLOSE, -1, &close, sizeof close);
proc_send(cf->peer, MSG_WRITE_CLOSE, -1, &close, sizeof close);
file_fire_done(cf);
}
free(msg);
}
/* Client file write error callback. */
static void
file_write_error_callback(__unused struct bufferevent *bev, __unused short what,
void *arg)
{
struct client_file *cf = arg;
log_debug("write error file %d", cf->stream);
if (cf->cb != NULL)
cf->cb(NULL, NULL, 0, -1, NULL, cf->data);
bufferevent_free(cf->event);
cf->event = NULL;
close(cf->fd);
cf->fd = -1;
}
/* Client file write callback. */
static void
file_write_callback(__unused struct bufferevent *bev, void *arg)
{
struct client_file *cf = arg;
log_debug("write check file %d", cf->stream);
if (cf->cb != NULL)
cf->cb(NULL, NULL, 0, -1, NULL, cf->data);
if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
bufferevent_free(cf->event);
close(cf->fd);
RB_REMOVE(client_files, cf->tree, cf);
file_free(cf);
}
}
/* Handle a file write open message (client). */
void
file_write_open(struct client_files *files, struct tmuxpeer *peer,
struct imsg *imsg, int allow_streams, int close_received,
client_file_cb cb, void *cbdata)
{
struct msg_write_open *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
const char *path;
struct msg_write_ready reply;
struct client_file find, *cf;
const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
int error = 0;
if (msglen < sizeof *msg)
fatalx("bad MSG_WRITE_OPEN size");
if (msglen == sizeof *msg)
path = "-";
else
path = (const char *)(msg + 1);
log_debug("open write file %d %s", msg->stream, path);
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) != NULL) {
error = EBADF;
goto reply;
}
cf = file_create_with_peer(peer, files, msg->stream, cb, cbdata);
if (cf->closed) {
error = EBADF;
goto reply;
}
cf->fd = -1;
if (msg->fd == -1)
cf->fd = open(path, msg->flags|flags, 0644);
else if (allow_streams) {
if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
errno = EBADF;
else {
cf->fd = dup(msg->fd);
if (close_received)
close(msg->fd); /* can only be used once */
}
} else
errno = EBADF;
if (cf->fd == -1) {
error = errno;
goto reply;
}
cf->event = bufferevent_new(cf->fd, NULL, file_write_callback,
file_write_error_callback, cf);
bufferevent_enable(cf->event, EV_WRITE);
goto reply;
reply:
reply.stream = msg->stream;
reply.error = error;
proc_send(peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
}
/* Handle a file write data message (client). */
void
file_write_data(struct client_files *files, struct imsg *imsg)
{
struct msg_write_data *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
size_t size = msglen - sizeof *msg;
if (msglen < sizeof *msg)
fatalx("bad MSG_WRITE size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) == NULL)
fatalx("unknown stream number");
log_debug("write %zu to file %d", size, cf->stream);
if (cf->event != NULL)
bufferevent_write(cf->event, msg + 1, size);
}
/* Handle a file write close message (client). */
void
file_write_close(struct client_files *files, struct imsg *imsg)
{
struct msg_write_close *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
if (msglen != sizeof *msg)
fatalx("bad MSG_WRITE_CLOSE size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) == NULL)
fatalx("unknown stream number");
log_debug("close file %d", cf->stream);
if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
if (cf->event != NULL)
bufferevent_free(cf->event);
if (cf->fd != -1)
close(cf->fd);
RB_REMOVE(client_files, files, cf);
file_free(cf);
}
}
/* Client file read error callback. */
static void
file_read_error_callback(__unused struct bufferevent *bev, __unused short what,
void *arg)
{
struct client_file *cf = arg;
struct msg_read_done msg;
log_debug("read error file %d", cf->stream);
msg.stream = cf->stream;
msg.error = 0;
proc_send(cf->peer, MSG_READ_DONE, -1, &msg, sizeof msg);
bufferevent_free(cf->event);
close(cf->fd);
RB_REMOVE(client_files, cf->tree, cf);
file_free(cf);
}
/* Client file read callback. */
static void
file_read_callback(__unused struct bufferevent *bev, void *arg)
{
struct client_file *cf = arg;
void *bdata;
size_t bsize;
struct msg_read_data *msg;
size_t msglen;
msg = xmalloc(sizeof *msg);
for (;;) {
bdata = EVBUFFER_DATA(cf->event->input);
bsize = EVBUFFER_LENGTH(cf->event->input);
if (bsize == 0)
break;
if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
log_debug("read %zu from file %d", bsize, cf->stream);
msglen = (sizeof *msg) + bsize;
msg = xrealloc(msg, msglen);
msg->stream = cf->stream;
memcpy(msg + 1, bdata, bsize);
proc_send(cf->peer, MSG_READ, -1, msg, msglen);
evbuffer_drain(cf->event->input, bsize);
}
free(msg);
}
/* Handle a file read open message (client). */
void
file_read_open(struct client_files *files, struct tmuxpeer *peer,
struct imsg *imsg, int allow_streams, int close_received, client_file_cb cb,
void *cbdata)
{
struct msg_read_open *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
const char *path;
struct msg_read_done reply;
struct client_file find, *cf;
const int flags = O_NONBLOCK|O_RDONLY;
int error;
if (msglen < sizeof *msg)
fatalx("bad MSG_READ_OPEN size");
if (msglen == sizeof *msg)
path = "-";
else
path = (const char *)(msg + 1);
log_debug("open read file %d %s", msg->stream, path);
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) != NULL) {
error = EBADF;
goto reply;
}
cf = file_create_with_peer(peer, files, msg->stream, cb, cbdata);
if (cf->closed) {
error = EBADF;
goto reply;
}
cf->fd = -1;
if (msg->fd == -1)
cf->fd = open(path, flags);
else if (allow_streams) {
if (msg->fd != STDIN_FILENO)
errno = EBADF;
else {
cf->fd = dup(msg->fd);
if (close_received)
close(msg->fd); /* can only be used once */
}
} else
errno = EBADF;
if (cf->fd == -1) {
error = errno;
goto reply;
}
cf->event = bufferevent_new(cf->fd, file_read_callback, NULL,
file_read_error_callback, cf);
bufferevent_enable(cf->event, EV_READ);
return;
reply:
reply.stream = msg->stream;
reply.error = error;
proc_send(peer, MSG_READ_DONE, -1, &reply, sizeof reply);
}
/* Handle a write ready message (server). */
void
file_write_ready(struct client_files *files, struct imsg *imsg)
{
struct msg_write_ready *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
if (msglen != sizeof *msg)
fatalx("bad MSG_WRITE_READY size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) == NULL)
return;
if (msg->error != 0) {
cf->error = msg->error;
file_fire_done(cf);
} else
file_push(cf);
}
/* Handle read data message (server). */
void
file_read_data(struct client_files *files, struct imsg *imsg)
{
struct msg_read_data *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
void *bdata = msg + 1;
size_t bsize = msglen - sizeof *msg;
if (msglen < sizeof *msg)
fatalx("bad MSG_READ_DATA size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) == NULL)
return;
log_debug("file %d read %zu bytes", cf->stream, bsize);
if (cf->error == 0) {
if (evbuffer_add(cf->buffer, bdata, bsize) != 0) {
cf->error = ENOMEM;
file_fire_done(cf);
} else
file_fire_read(cf);
}
}
/* Handle a read done message (server). */
void
file_read_done(struct client_files *files, struct imsg *imsg)
{
struct msg_read_done *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
if (msglen != sizeof *msg)
fatalx("bad MSG_READ_DONE size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, files, &find)) == NULL)
return;
log_debug("file %d read done", cf->stream);
cf->error = msg->error;
file_fire_done(cf);
}

77
server-client.c
View File

@@ -51,12 +51,6 @@ static void server_client_dispatch(struct imsg *, void *);
static void server_client_dispatch_command(struct client *, struct imsg *);
static void server_client_dispatch_identify(struct client *, struct imsg *);
static void server_client_dispatch_shell(struct client *);
static void server_client_dispatch_write_ready(struct client *,
struct imsg *);
static void server_client_dispatch_read_data(struct client *,
struct imsg *);
static void server_client_dispatch_read_done(struct client *,
struct imsg *);
/* Compare client windows. */
static int
@@ -2070,13 +2064,13 @@ server_client_dispatch(struct imsg *imsg, void *arg)
server_client_dispatch_shell(c);
break;
case MSG_WRITE_READY:
server_client_dispatch_write_ready(c, imsg);
file_write_ready(&c->files, imsg);
break;
case MSG_READ:
server_client_dispatch_read_data(c, imsg);
file_read_data(&c->files, imsg);
break;
case MSG_READ_DONE:
server_client_dispatch_read_done(c, imsg);
file_read_done(&c->files, imsg);
break;
}
}
@@ -2302,71 +2296,6 @@ server_client_dispatch_shell(struct client *c)
proc_kill_peer(c->peer);
}
/* Handle write ready message. */
static void
server_client_dispatch_write_ready(struct client *c, struct imsg *imsg)
{
struct msg_write_ready *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
if (msglen != sizeof *msg)
fatalx("bad MSG_WRITE_READY size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL)
return;
if (msg->error != 0) {
cf->error = msg->error;
file_fire_done(cf);
} else
file_push(cf);
}
/* Handle read data message. */
static void
server_client_dispatch_read_data(struct client *c, struct imsg *imsg)
{
struct msg_read_data *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
void *bdata = msg + 1;
size_t bsize = msglen - sizeof *msg;
if (msglen < sizeof *msg)
fatalx("bad MSG_READ_DATA size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL)
return;
log_debug("%s: file %d read %zu bytes", c->name, cf->stream, bsize);
if (cf->error == 0) {
if (evbuffer_add(cf->buffer, bdata, bsize) != 0) {
cf->error = ENOMEM;
file_fire_done(cf);
} else
file_fire_read(cf);
}
}
/* Handle read done message. */
static void
server_client_dispatch_read_done(struct client *c, struct imsg *imsg)
{
struct msg_read_done *msg = imsg->data;
size_t msglen = imsg->hdr.len - IMSG_HEADER_SIZE;
struct client_file find, *cf;
if (msglen != sizeof *msg)
fatalx("bad MSG_READ_DONE size");
find.stream = msg->stream;
if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL)
return;
log_debug("%s: file %d read done", c->name, cf->stream);
cf->error = msg->error;
file_fire_done(cf);
}
/* Get client working directory. */
const char *
server_client_get_cwd(struct client *c, struct session *s)

17
tmux.h
View File

@@ -1539,6 +1539,8 @@ typedef void (*client_file_cb) (struct client *, const char *, int, int,
struct evbuffer *, void *);
struct client_file {
struct client *c;
struct tmuxpeer *peer;
struct client_files *tree;
int references;
int stream;
@@ -1907,6 +1909,7 @@ int load_cfg(const char *, struct client *, struct cmdq_item *, int,
int load_cfg_from_buffer(const void *, size_t, const char *,
struct client *, struct cmdq_item *, int, struct cmdq_item **);
void set_cfg_file(const char *);
const char *get_cfg_file(void);
void printflike(1, 2) cfg_add_cause(const char *, ...);
void cfg_print_causes(struct cmdq_item *);
void cfg_show_causes(struct session *);
@@ -2370,7 +2373,10 @@ void alerts_check_session(struct session *);
/* file.c */
int file_cmp(struct client_file *, struct client_file *);
RB_PROTOTYPE(client_files, client_file, entry, file_cmp);
struct client_file *file_create(struct client *, int, client_file_cb, void *);
struct client_file *file_create_with_peer(struct tmuxpeer *,
struct client_files *, int, client_file_cb, void *);
struct client_file *file_create_with_client(struct client *, int,
client_file_cb, void *);
void file_free(struct client_file *);
void file_fire_done(struct client_file *);
void file_fire_read(struct client_file *);
@@ -2383,6 +2389,15 @@ void file_write(struct client *, const char *, int, const void *, size_t,
client_file_cb, void *);
void file_read(struct client *, const char *, client_file_cb, void *);
void file_push(struct client_file *);
void file_write_open(struct client_files *, struct tmuxpeer *,
struct imsg *, int, int, client_file_cb, void *);
void file_write_data(struct client_files *, struct imsg *);
void file_write_close(struct client_files *, struct imsg *);
void file_read_open(struct client_files *, struct tmuxpeer *, struct imsg *,
int, int, client_file_cb, void *);
void file_write_ready(struct client_files *, struct imsg *);
void file_read_data(struct client_files *, struct imsg *);
void file_read_done(struct client_files *, struct imsg *);
/* server.c */
extern struct tmuxproc *server_proc;