File: [local] / src / usr.bin / rsync / main.c (download)
Revision 1.33, Mon Mar 18 08:11:11 2019 UTC (5 years, 2 months ago) by jmc
Branch: MAIN
Changes since 1.32: +6 -3 lines
flesh out SYNOPSIS and usage() somewhat;
ok deraadt benno
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/* $Id: main.c,v 1.33 2019/03/18 08:11:11 jmc 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 <sys/socket.h>
#include <sys/wait.h>
#include <assert.h>
#include <err.h>
#include <getopt.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
/*
* A remote host is has a colon before the first path separator.
* This works for rsh remote hosts (host:/foo/bar), implicit rsync
* remote hosts (host::/foo/bar), and explicit (rsync://host/foo).
* Return zero if local, non-zero if remote.
*/
static int
fargs_is_remote(const char *v)
{
size_t pos;
pos = strcspn(v, ":/");
return v[pos] == ':';
}
/*
* Test whether a remote host is specifically an rsync daemon.
* Return zero if not, non-zero if so.
*/
static int
fargs_is_daemon(const char *v)
{
size_t pos;
if (strncasecmp(v, "rsync://", 8) == 0)
return 1;
pos = strcspn(v, ":/");
return v[pos] == ':' && v[pos + 1] == ':';
}
/*
* Take the command-line filenames (e.g., rsync foo/ bar/ baz/) and
* determine our operating mode.
* For example, if the first argument is a remote file, this means that
* we're going to transfer from the remote to the local.
* We also make sure that the arguments are consistent, that is, if
* we're going to transfer from the local to the remote, that no
* filenames for the local transfer indicate remote hosts.
* Always returns the parsed and sanitised options.
*/
static struct fargs *
fargs_parse(size_t argc, char *argv[], struct opts *opts)
{
struct fargs *f = NULL;
char *cp, *ccp;
size_t i, j, len = 0;
/* Allocations. */
if ((f = calloc(1, sizeof(struct fargs))) == NULL)
err(1, "calloc");
f->sourcesz = argc - 1;
if ((f->sources = calloc(f->sourcesz, sizeof(char *))) == NULL)
err(1, "calloc");
for (i = 0; i < argc - 1; i++)
if ((f->sources[i] = strdup(argv[i])) == NULL)
err(1, "strdup");
if ((f->sink = strdup(argv[i])) == NULL)
err(1, "strdup");
/*
* Test files for its locality.
* If the last is a remote host, then we're sending from the
* local to the remote host ("sender" mode).
* If the first, remote to local ("receiver" mode).
* If neither, a local transfer in sender style.
*/
f->mode = FARGS_SENDER;
if (fargs_is_remote(f->sink)) {
f->mode = FARGS_SENDER;
if ((f->host = strdup(f->sink)) == NULL)
err(1, "strdup");
}
if (fargs_is_remote(f->sources[0])) {
if (f->host != NULL)
errx(1, "both source and "
"destination cannot be remote files");
f->mode = FARGS_RECEIVER;
if ((f->host = strdup(f->sources[0])) == NULL)
err(1, "strdup");
}
if (f->host != NULL) {
if (strncasecmp(f->host, "rsync://", 8) == 0) {
/* rsync://host[:port]/module[/path] */
f->remote = 1;
len = strlen(f->host) - 8 + 1;
memmove(f->host, f->host + 8, len);
if ((cp = strchr(f->host, '/')) == NULL)
errx(1, "rsync protocol requires a module "
"name");
*cp++ = '\0';
f->module = cp;
if ((cp = strchr(f->module, '/')) != NULL)
*cp = '\0';
if ((cp = strchr(f->host, ':'))) {
/* host:port --> extract port */
*cp++ = '\0';
opts->port = cp;
}
} else {
/* host:[/path] */
cp = strchr(f->host, ':');
assert(cp != NULL);
*cp++ = '\0';
if (*cp == ':') {
/* host::module[/path] */
f->remote = 1;
f->module = ++cp;
cp = strchr(f->module, '/');
if (cp != NULL)
*cp = '\0';
}
}
if ((len = strlen(f->host)) == 0)
errx(1, "empty remote host");
if (f->remote && strlen(f->module) == 0)
errx(1, "empty remote module");
}
/* Make sure we have the same "hostspec" for all files. */
if (!f->remote) {
if (f->mode == FARGS_SENDER)
for (i = 0; i < f->sourcesz; i++) {
if (!fargs_is_remote(f->sources[i]))
continue;
errx(1, "remote file in "
"list of local sources: %s",
f->sources[i]);
}
if (f->mode == FARGS_RECEIVER)
for (i = 0; i < f->sourcesz; i++) {
if (fargs_is_remote(f->sources[i]) &&
!fargs_is_daemon(f->sources[i]))
continue;
if (fargs_is_daemon(f->sources[i]))
errx(1, "remote "
"daemon in list of "
"remote sources: %s",
f->sources[i]);
errx(1, "local file in "
"list of remote sources: %s",
f->sources[i]);
}
} else {
if (f->mode != FARGS_RECEIVER)
errx(1, "sender mode for remote "
"daemon receivers not yet supported");
for (i = 0; i < f->sourcesz; i++) {
if (fargs_is_daemon(f->sources[i]))
continue;
errx(1, "non-remote daemon file "
"in list of remote daemon sources: "
"%s", f->sources[i]);
}
}
/*
* If we're not remote and a sender, strip our hostname.
* Then exit if we're a sender or a local connection.
*/
if (!f->remote) {
if (f->host == NULL)
return f;
if (f->mode == FARGS_SENDER) {
assert(f->host != NULL);
assert(len > 0);
j = strlen(f->sink);
memmove(f->sink, f->sink + len + 1, j - len);
return f;
} else if (f->mode != FARGS_RECEIVER)
return f;
}
/*
* Now strip the hostnames from the remote host.
* rsync://host/module/path -> module/path
* host::module/path -> module/path
* host:path -> path
* Also make sure that the remote hosts are the same.
*/
assert(f->host != NULL);
assert(len > 0);
for (i = 0; i < f->sourcesz; i++) {
cp = f->sources[i];
j = strlen(cp);
if (f->remote &&
strncasecmp(cp, "rsync://", 8) == 0) {
/* rsync://path */
cp += 8;
if ((ccp = strchr(cp, ':'))) /* skip :port */
*ccp = '\0';
if (strncmp(cp, f->host, len) ||
(cp[len] != '/' && cp[len] != '\0'))
errx(1, "different remote "
"host: %s", f->sources[i]);
memmove(f->sources[i],
f->sources[i] + len + 8 + 1,
j - len - 8);
} else if (f->remote && strncmp(cp, "::", 2) == 0) {
/* ::path */
memmove(f->sources[i],
f->sources[i] + 2, j - 1);
} else if (f->remote) {
/* host::path */
if (strncmp(cp, f->host, len) ||
(cp[len] != ':' && cp[len] != '\0'))
errx(1, "different remote "
"host: %s", f->sources[i]);
memmove(f->sources[i], f->sources[i] + len + 2,
j - len - 1);
} else if (cp[0] == ':') {
/* :path */
memmove(f->sources[i], f->sources[i] + 1, j);
} else {
/* host:path */
if (strncmp(cp, f->host, len) ||
(cp[len] != ':' && cp[len] != '\0'))
errx(1, "different remote "
"host: %s", f->sources[i]);
memmove(f->sources[i],
f->sources[i] + len + 1, j - len);
}
}
return f;
}
int
main(int argc, char *argv[])
{
struct opts opts;
pid_t child;
int fds[2], rc = 0, c, st, i;
struct sess sess;
struct fargs *fargs;
char **args;
struct option lopts[] = {
{ "port", required_argument, NULL, 3 },
{ "rsh", required_argument, NULL, 'e' },
{ "rsync-path", required_argument, NULL, 1 },
{ "sender", no_argument, &opts.sender, 1 },
{ "server", no_argument, &opts.server, 1 },
{ "dry-run", no_argument, &opts.dry_run, 1 },
{ "version", no_argument, NULL, 2 },
{ "archive", no_argument, NULL, 'a' },
{ "help", no_argument, NULL, 'h' },
{ "delete", no_argument, &opts.del, 1 },
{ "no-delete", no_argument, &opts.del, 0 },
{ "devices", no_argument, &opts.devices, 1 },
{ "no-devices", no_argument, &opts.devices, 0 },
{ "group", no_argument, &opts.preserve_gids, 1 },
{ "no-group", no_argument, &opts.preserve_gids, 0 },
{ "links", no_argument, &opts.preserve_links, 1 },
{ "no-links", no_argument, &opts.preserve_links, 0 },
{ "owner", no_argument, &opts.preserve_uids, 1 },
{ "no-owner", no_argument, &opts.preserve_uids, 0 },
{ "perms", no_argument, &opts.preserve_perms, 1 },
{ "no-perms", no_argument, &opts.preserve_perms, 0 },
{ "numeric-ids", no_argument, &opts.numeric_ids, 1 },
{ "recursive", no_argument, &opts.recursive, 1 },
{ "no-recursive", no_argument, &opts.recursive, 0 },
{ "specials", no_argument, &opts.specials, 1 },
{ "no-specials", no_argument, &opts.specials, 0 },
{ "times", no_argument, &opts.preserve_times, 1 },
{ "no-times", no_argument, &opts.preserve_times, 0 },
{ "verbose", no_argument, &opts.verbose, 1 },
{ "no-verbose", no_argument, &opts.verbose, 0 },
{ NULL, 0, NULL, 0 }};
/* Global pledge. */
if (pledge("stdio unix rpath wpath cpath dpath inet fattr chown dns getpw proc exec unveil",
NULL) == -1)
err(1, "pledge");
memset(&opts, 0, sizeof(struct opts));
while ((c = getopt_long(argc, argv, "Dae:ghlnoprtv", lopts, NULL))
!= -1) {
switch (c) {
case 'D':
opts.devices = 1;
opts.specials = 1;
break;
case 'a':
opts.recursive = 1;
opts.preserve_links = 1;
opts.preserve_perms = 1;
opts.preserve_times = 1;
opts.preserve_gids = 1;
opts.preserve_uids = 1;
opts.devices = 1;
opts.specials = 1;
break;
case 'e':
opts.ssh_prog = optarg;
break;
case 'g':
opts.preserve_gids = 1;
break;
case 'l':
opts.preserve_links = 1;
break;
case 'n':
opts.dry_run = 1;
break;
case 'o':
opts.preserve_uids = 1;
break;
case 'p':
opts.preserve_perms = 1;
break;
case 'r':
opts.recursive = 1;
break;
case 't':
opts.preserve_times = 1;
break;
case 'v':
opts.verbose++;
break;
case 0:
/* Non-NULL flag values (e.g., --sender). */
break;
case 1:
opts.rsync_path = optarg;
break;
case 2:
fprintf(stderr, "openrsync: protocol version %u\n",
RSYNC_PROTOCOL);
exit(0);
case 3:
opts.port = optarg;
break;
case 'h':
default:
goto usage;
}
}
argc -= optind;
argv += optind;
/* FIXME: reference implementation rsync accepts this. */
if (argc < 2)
goto usage;
if (opts.port == NULL)
opts.port = "rsync";
/*
* This is what happens when we're started with the "hidden"
* --server option, which is invoked for the rsync on the remote
* host by the parent.
*/
if (opts.server)
exit(rsync_server(&opts, (size_t)argc, argv));
/*
* Now we know that we're the client on the local machine
* invoking rsync(1).
* At this point, we need to start the client and server
* initiation logic.
* The client is what we continue running on this host; the
* server is what we'll use to connect to the remote and
* invoke rsync with the --server option.
*/
fargs = fargs_parse(argc, argv, &opts);
assert(fargs != NULL);
/*
* If we're contacting an rsync:// daemon, then we don't need to
* fork, because we won't start a server ourselves.
* Route directly into the socket code, in that case.
*/
if (fargs->remote) {
assert(fargs->mode == FARGS_RECEIVER);
exit(rsync_socket(&opts, fargs));
}
/* Drop the dns/inet possibility. */
if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw proc exec unveil",
NULL) == -1)
err(1, "pledge");
/* Create a bidirectional socket and start our child. */
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, fds) == -1)
err(1, "socketpair");
switch ((child = fork())) {
case -1:
err(1, "fork");
case 0:
close(fds[0]);
if (pledge("stdio exec", NULL) == -1)
err(1, "pledge");
memset(&sess, 0, sizeof(struct sess));
sess.opts = &opts;
if ((args = fargs_cmdline(&sess, fargs)) == NULL) {
ERRX1(&sess, "fargs_cmdline");
_exit(1);
}
for (i = 0; args[i] != NULL; i++)
LOG2(&sess, "exec[%d] = %s", i, args[i]);
/* Make sure the child's stdin is from the sender. */
if (dup2(fds[1], STDIN_FILENO) == -1) {
ERR(&sess, "dup2");
_exit(1);
} if (dup2(fds[1], STDOUT_FILENO) == -1) {
ERR(&sess, "dup2");
_exit(1);
}
execvp(args[0], args);
_exit(1);
/* NOTREACHED */
default:
close(fds[1]);
rc = rsync_client(&opts, fds[0], fargs);
break;
}
/*
* If the client has an error and exits, the server may be
* sitting around waiting to get data while we waitpid().
* So close the connection here so that they don't hang.
*/
if (!rc)
close(fds[0]);
if (waitpid(child, &st, 0) == -1)
err(1, "waitpid");
if (!(WIFEXITED(st) && WEXITSTATUS(st) == 0))
rc = 0;
exit(rc);
usage:
fprintf(stderr, "usage: %s [-aDglnoprtv] [-e program] [--archive] [--delete] [--devices]\n"
"\t[--group] [--links] [--dry-run] [--owner] [--perms]\n"
"\t[--port=portnumber] [--recursive] [--rsh=program]\n"
"\t[--rsync-path=program] [--specials] [--times] [--verbose]\n"
"\t[--version] source ... directory\n",
getprogname());
exit(1);
}