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/* $Id: sender.c,v 1.3 2019/02/10 23:43:31 benno Exp $ */
/*
* Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
*
* 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 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/stat.h>
#include <assert.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
/*
* A client sender manages the read-only source files and sends data to
* the receiver as requested.
* First it sends its list of files, then it waits for the server to
* request updates to individual files.
* Returns zero on failure, non-zero on success.
*
* Pledges: stdio, rpath, unveil.
*/
int
rsync_sender(struct sess *sess, int fdin,
int fdout, size_t argc, char **argv)
{
struct flist *fl = NULL;
size_t flsz = 0, phase = 0, excl;
int rc = 0, c;
int32_t idx;
struct blkset *blks = NULL;
if (-1 == pledge("stdio rpath unveil", NULL)) {
ERR(sess, "pledge");
return 0;
}
/*
* Generate the list of files we want to send from our
* command-line input.
* This will also remove all invalid files.
*/
if ( ! flist_gen(sess, argc, argv, &fl, &flsz)) {
ERRX1(sess, "flist_gen");
goto out;
}
/* Client sends zero-length exclusions if deleting. */
if ( ! sess->opts->server && sess->opts->del &&
! io_write_int(sess, fdout, 0)) {
ERRX1(sess, "io_write_int");
goto out;
}
/*
* Then the file list in any mode.
* Finally, the IO error (always zero for us).
*/
if ( ! flist_send(sess, fdin, fdout, fl, flsz)) {
ERRX1(sess, "flist_send");
goto out;
} else if ( ! io_write_int(sess, fdout, 0)) {
ERRX1(sess, "io_write_int");
goto out;
}
/* Exit if we're the server with zero files. */
if (0 == flsz && sess->opts->server) {
WARNX(sess, "sender has empty file list: exiting");
rc = 1;
goto out;
} else if ( ! sess->opts->server)
LOG1(sess, "Transfer starting: %zu files", flsz);
/*
* If we're the server, read our exclusion list.
* This is always 0 for now.
*/
if (sess->opts->server) {
if ( ! io_read_size(sess, fdin, &excl)) {
ERRX1(sess, "io_read_size");
goto out;
} else if (0 != excl) {
ERRX1(sess, "exclusion list is non-empty");
goto out;
}
}
/*
* We have two phases: the first has a two-byte checksum, the
* second has a full 16-byte checksum.
*/
LOG2(sess, "sender transmitting phase 1 data");
for (;;) {
if ( ! io_read_int(sess, fdin, &idx)) {
ERRX1(sess, "io_read_int");
goto out;
}
/*
* If we receive an invalid index (-1), then we're
* either promoted to the second phase or it's time to
* exit, depending upon which phase we're in.
*/
if (-1 == idx) {
if ( ! io_write_int(sess, fdout, idx)) {
ERRX1(sess, "io_write_int");
goto out;
}
/* FIXME: I don't understand this ack. */
if (sess->opts->server && sess->rver > 27)
if ( ! io_write_int(sess, fdout, idx)) {
ERRX1(sess, "io_write_int");
goto out;
}
if (phase++)
break;
LOG2(sess, "sender transmitting phase 2 data");
continue;
}
/* Validate index and file type. */
if (idx < 0 || (uint32_t)idx >= flsz) {
ERRX(sess, "file index out of bounds: "
"invalid %" PRId32 " out of %zu",
idx, flsz);
goto out;
} else if (S_ISDIR(fl[idx].st.mode)) {
ERRX(sess, "blocks requested for "
"directory: %s", fl[idx].path);
goto out;
} else if (S_ISLNK(fl[idx].st.mode)) {
ERRX(sess, "blocks requested for "
"symlink: %s", fl[idx].path);
goto out;
} else if ( ! S_ISREG(fl[idx].st.mode)) {
ERRX(sess, "blocks requested for "
"special: %s", fl[idx].path);
goto out;
}
if ( ! sess->opts->server)
LOG1(sess, "%s", fl[idx].wpath);
/* Dry-run doesn't do anything. */
if (sess->opts->dry_run) {
if ( ! io_write_int(sess, fdout, idx)) {
ERRX1(sess, "io_write_int");
goto out;
}
continue;
}
/*
* The server will now send us its view of the file.
* It does so by cutting a file into a series of blocks
* and checksumming each block.
* We can then compare the blocks in our file and those
* in theirs, and send them blocks they're missing or
* don't have.
*/
blks = blk_recv(sess, fdin, fl[idx].path);
if (NULL == blks) {
ERRX1(sess, "blk_recv");
goto out;
} else if ( ! blk_recv_ack(sess, fdout, blks, idx)) {
ERRX1(sess, "blk_recv_ack");
goto out;
}
c = blk_match(sess, fdout, blks, fl[idx].path);
blkset_free(blks);
if ( ! c) {
ERRX1(sess, "blk_match");
goto out;
}
}
if ( ! sess_stats_send(sess, fdout)) {
ERRX1(sess, "sess_stats_end");
goto out;
}
/* Final "goodbye" message. */
if ( ! io_read_int(sess, fdin, &idx)) {
ERRX1(sess, "io_read_int");
goto out;
} else if (-1 != idx) {
ERRX(sess, "read incorrect update complete ack");
goto out;
}
LOG2(sess, "sender finished updating");
rc = 1;
out:
flist_free(fl, flsz);
return rc;
}
|
