1 /* $Id: client.c,v 1.14 2019/03/23 16:04:28 deraadt Exp $ */ 2 /* 3 * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #include <sys/stat.h> 18 19 #include <assert.h> 20 #include <inttypes.h> 21 #include <stdlib.h> 22 #include <string.h> 23 #include <unistd.h> 24 #include <err.h> 25 26 #include "extern.h" 27 28 /* 29 * The rsync client runs on the operator's local machine. 30 * It can either be in sender or receiver mode. 31 * In the former, it synchronises local files from a remote sink. 32 * In the latter, the remote sink synchronses to the local files. 33 * Returns exit code 0 on success, 1 on failure, 2 on failure with 34 * incompatible protocols. 35 */ 36 int 37 rsync_client(const struct opts *opts, int fd, const struct fargs *f) 38 { 39 struct sess sess; 40 int rc = 1; 41 42 /* Standard rsync preamble, sender side. */ 43 44 if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw unveil", 45 NULL) == -1) 46 err(1, "pledge"); 47 48 memset(&sess, 0, sizeof(struct sess)); 49 sess.opts = opts; 50 sess.lver = RSYNC_PROTOCOL; 51 52 if (!io_write_int(&sess, fd, sess.lver)) { 53 ERRX1(&sess, "io_write_int"); 54 goto out; 55 } else if (!io_read_int(&sess, fd, &sess.rver)) { 56 ERRX1(&sess, "io_read_int"); 57 goto out; 58 } else if (!io_read_int(&sess, fd, &sess.seed)) { 59 ERRX1(&sess, "io_read_int"); 60 goto out; 61 } 62 63 if (sess.rver < sess.lver) { 64 ERRX(&sess, 65 "remote protocol %d is older than our own %d: unsupported", 66 sess.rver, sess.lver); 67 rc = 2; 68 goto out; 69 } 70 71 LOG2(&sess, "client detected client version %d, server version %d, seed %d", 72 sess.lver, sess.rver, sess.seed); 73 74 sess.mplex_reads = 1; 75 76 /* 77 * Now we need to get our list of files. 78 * Senders (and locals) send; receivers receive. 79 */ 80 81 if (f->mode != FARGS_RECEIVER) { 82 LOG2(&sess, "client starting sender: %s", 83 f->host == NULL ? "(local)" : f->host); 84 if (!rsync_sender(&sess, fd, fd, f->sourcesz, 85 f->sources)) { 86 ERRX1(&sess, "rsync_sender"); 87 goto out; 88 } 89 } else { 90 LOG2(&sess, "client starting receiver: %s", 91 f->host == NULL ? "(local)" : f->host); 92 if (!rsync_receiver(&sess, fd, fd, f->sink)) { 93 ERRX1(&sess, "rsync_receiver"); 94 goto out; 95 } 96 } 97 98 #if 0 99 /* Probably the EOF. */ 100 if (io_read_check(&sess, fd)) 101 WARNX(&sess, "data remains in read pipe"); 102 #endif 103 104 rc = 0; 105 out: 106 return rc; 107 } 108