Adding upstream version 3.3a.upstream/3.3aupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 819 insertions, 0 deletions

diff --git a/file.c b/file.c
new file mode 100644
index 0000000..b2f155f
--- /dev/null
+++ b/file.c
@@ -0,0 +1,819 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#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)
+{
+	char	*path;
+
+	if (*file == '/')
+		path = xstrdup(file);
+	else
+		xasprintf(&path, "%s/%s", server_client_get_cwd(c, NULL), file);
+	return (path);
+}
+
+/* Tree comparison function. */
+int
+file_cmp(struct client_file *cf1, struct client_file *cf2)
+{
+	if (cf1->stream < cf2->stream)
+		return (-1);
+	if (cf1->stream > cf2->stream)
+		return (1);
+	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_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;
+	cf->stream = stream;
+
+	cf->buffer = evbuffer_new();
+	if (cf->buffer == NULL)
+		fatalx("out of memory");
+
+	cf->cb = cb;
+	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++;
+	}
+
+	return (cf);
+}
+
+/* Free a file. */
+void
+file_free(struct client_file *cf)
+{
+	if (--cf->references != 0)
+		return;
+
+	evbuffer_free(cf->buffer);
+	free(cf->path);
+
+	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)
+{
+	struct client_file	*cf = arg;
+	struct client		*c = cf->c;
+
+	if (cf->cb != NULL && (c == NULL || (~c->flags & CLIENT_DEAD)))
+		cf->cb(c, cf->path, cf->error, 1, cf->buffer, cf->data);
+	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)
+{
+	if (cf->cb != NULL)
+		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)
+{
+	if (c == NULL)
+		return (0);
+	if (c->session != NULL && (~c->flags & CLIENT_CONTROL))
+		return (0);
+	return (1);
+}
+
+/* Print a message to a file. */
+void
+file_print(struct client *c, const char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	file_vprint(c, fmt, ap);
+	va_end(ap);
+}
+
+/* Print a message to a file. */
+void
+file_vprint(struct client *c, const char *fmt, va_list ap)
+{
+	struct client_file	 find, *cf;
+	struct msg_write_open	 msg;
+
+	if (!file_can_print(c))
+		return;
+
+	find.stream = 1;
+	if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL) {
+		cf = file_create_with_client(c, 1, NULL, NULL);
+		cf->path = xstrdup("-");
+
+		evbuffer_add_vprintf(cf->buffer, fmt, ap);
+
+		msg.stream = 1;
+		msg.fd = STDOUT_FILENO;
+		msg.flags = 0;
+		proc_send(c->peer, MSG_WRITE_OPEN, -1, &msg, sizeof msg);
+	} else {
+		evbuffer_add_vprintf(cf->buffer, fmt, ap);
+		file_push(cf);
+	}
+}
+
+/* Print a buffer to a file. */
+void
+file_print_buffer(struct client *c, void *data, size_t size)
+{
+	struct client_file	 find, *cf;
+	struct msg_write_open	 msg;
+
+	if (!file_can_print(c))
+		return;
+
+	find.stream = 1;
+	if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL) {
+		cf = file_create_with_client(c, 1, NULL, NULL);
+		cf->path = xstrdup("-");
+
+		evbuffer_add(cf->buffer, data, size);
+
+		msg.stream = 1;
+		msg.fd = STDOUT_FILENO;
+		msg.flags = 0;
+		proc_send(c->peer, MSG_WRITE_OPEN, -1, &msg, sizeof msg);
+	} else {
+		evbuffer_add(cf->buffer, data, size);
+		file_push(cf);
+	}
+}
+
+/* Report an error to a file. */
+void
+file_error(struct client *c, const char *fmt, ...)
+{
+	struct client_file	 find, *cf;
+	struct msg_write_open	 msg;
+	va_list			 ap;
+
+	if (!file_can_print(c))
+		return;
+
+	va_start(ap, fmt);
+
+	find.stream = 2;
+	if ((cf = RB_FIND(client_files, &c->files, &find)) == NULL) {
+		cf = file_create_with_client(c, 2, NULL, NULL);
+		cf->path = xstrdup("-");
+
+		evbuffer_add_vprintf(cf->buffer, fmt, ap);
+
+		msg.stream = 2;
+		msg.fd = STDERR_FILENO;
+		msg.flags = 0;
+		proc_send(c->peer, MSG_WRITE_OPEN, -1, &msg, sizeof msg);
+	} else {
+		evbuffer_add_vprintf(cf->buffer, fmt, ap);
+		file_push(cf);
+	}
+
+	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;
+	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_with_client(c, stream, cb, cbdata);
+		cf->path = xstrdup("-");
+
+		fd = STDOUT_FILENO;
+		if (c == NULL ||
+		    (c->flags & CLIENT_ATTACHED) ||
+		    (c->flags & CLIENT_CONTROL)) {
+			cf->error = EBADF;
+			goto done;
+		}
+		goto skip;
+	}
+
+	cf = file_create_with_client(c, stream, cb, cbdata);
+	cf->path = file_get_path(c, path);
+
+	if (c == NULL || c->flags & CLIENT_ATTACHED) {
+		if (flags & O_APPEND)
+			mode = "ab";
+		else
+			mode = "wb";
+		f = fopen(cf->path, mode);
+		if (f == NULL) {
+			cf->error = errno;
+			goto done;
+		}
+		if (fwrite(bdata, 1, bsize, f) != bsize) {
+			fclose(f);
+			cf->error = EIO;
+			goto done;
+		}
+		fclose(f);
+		goto done;
+	}
+
+skip:
+	evbuffer_add(cf->buffer, bdata, bsize);
+
+	msglen = strlen(cf->path) + 1 + sizeof *msg;
+	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
+		cf->error = E2BIG;
+		goto done;
+	}
+	msg = xmalloc(msglen);
+	msg->stream = cf->stream;
+	msg->fd = fd;
+	msg->flags = flags;
+	memcpy(msg + 1, cf->path, msglen - sizeof *msg);
+	if (proc_send(cf->peer, MSG_WRITE_OPEN, -1, msg, msglen) != 0) {
+		free(msg);
+		cf->error = EINVAL;
+		goto done;
+	}
+	free(msg);
+	return;
+
+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;
+	struct msg_read_open	*msg;
+	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_with_client(c, stream, cb, cbdata);
+		cf->path = xstrdup("-");
+
+		fd = STDIN_FILENO;
+		if (c == NULL ||
+		    (c->flags & CLIENT_ATTACHED) ||
+		    (c->flags & CLIENT_CONTROL)) {
+			cf->error = EBADF;
+			goto done;
+		}
+		goto skip;
+	}
+
+	cf = file_create_with_client(c, stream, cb, cbdata);
+	cf->path = file_get_path(c, path);
+
+	if (c == NULL || c->flags & CLIENT_ATTACHED) {
+		f = fopen(cf->path, "rb");
+		if (f == NULL) {
+			cf->error = errno;
+			goto done;
+		}
+		for (;;) {
+			size = fread(buffer, 1, sizeof buffer, f);
+			if (evbuffer_add(cf->buffer, buffer, size) != 0) {
+				cf->error = ENOMEM;
+				goto done;
+			}
+			if (size != sizeof buffer)
+				break;
+		}
+		if (ferror(f)) {
+			cf->error = EIO;
+			goto done;
+		}
+		fclose(f);
+		goto done;
+	}
+
+skip:
+	msglen = strlen(cf->path) + 1 + sizeof *msg;
+	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
+		cf->error = E2BIG;
+		goto done;
+	}
+	msg = xmalloc(msglen);
+	msg->stream = cf->stream;
+	msg->fd = fd;
+	memcpy(msg + 1, cf->path, msglen - sizeof *msg);
+	if (proc_send(cf->peer, MSG_READ_OPEN, -1, msg, msglen) != 0) {
+		free(msg);
+		cf->error = EINVAL;
+		goto done;
+	}
+	free(msg);
+	return;
+
+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;
+
+	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 msg_write_data	*msg;
+	size_t			 msglen, sent, left;
+	struct msg_write_close	 close;
+
+	msg = xmalloc(sizeof *msg);
+	left = EVBUFFER_LENGTH(cf->buffer);
+	while (left != 0) {
+		sent = left;
+		if (sent > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
+			sent = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
+
+		msglen = (sizeof *msg) + sent;
+		msg = xrealloc(msg, msglen);
+		msg->stream = cf->stream;
+		memcpy(msg + 1, EVBUFFER_DATA(cf->buffer), sent);
+		if (proc_send(cf->peer, MSG_WRITE, -1, msg, msglen) != 0)
+			break;
+		evbuffer_drain(cf->buffer, sent);
+
+		left = EVBUFFER_LENGTH(cf->buffer);
+		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(cf->peer, MSG_WRITE_CLOSE, -1, &close, sizeof close);
+		file_fire_done(cf);
+	}
+	free(msg);
+}
+
+/* Check if any files have data left to write. */
+int
+file_write_left(struct client_files *files)
+{
+	struct client_file	*cf;
+	size_t			 left;
+	int			 waiting = 0;
+
+	RB_FOREACH(cf, client_files, files) {
+		if (cf->event == NULL)
+			continue;
+		left = EVBUFFER_LENGTH(cf->event->output);
+		if (left != 0) {
+			waiting++;
+			log_debug("file %u %zu bytes left", cf->stream, left);
+		}
+	}
+	return (waiting != 0);
+}
+
+/* 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);
+
+	bufferevent_free(cf->event);
+	cf->event = NULL;
+
+	close(cf->fd);
+	cf->fd = -1;
+
+	if (cf->cb != NULL)
+		cf->cb(NULL, NULL, 0, -1, NULL, cf->data);
+}
+
+/* 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 (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 (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);
+}