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main.c
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/*
* The startup routines, including main(), for rsync.
*
* Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2020 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, visit the http://fsf.org website.
*/
#include "rsync.h"
#include "inums.h"
#include "io.h"
#if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
#include <locale.h>
#endif
#include <popt.h>
extern int dry_run;
extern int list_only;
extern int io_timeout;
extern int am_root;
extern int am_server;
extern int am_sender;
extern int am_daemon;
extern int inc_recurse;
extern int blocking_io;
extern int always_checksum;
extern int remove_source_files;
extern int output_needs_newline;
extern int called_from_signal_handler;
extern int need_messages_from_generator;
extern int kluge_around_eof;
extern int got_xfer_error;
extern int msgs2stderr;
extern int module_id;
extern int read_only;
extern int copy_links;
extern int copy_dirlinks;
extern int copy_unsafe_links;
extern int keep_dirlinks;
extern int preserve_hard_links;
extern int protocol_version;
extern int file_total;
extern int recurse;
extern int xfer_dirs;
extern int protect_args;
extern int relative_paths;
extern int sanitize_paths;
extern int curr_dir_depth;
extern int curr_dir_len;
extern int module_id;
extern int rsync_port;
extern int whole_file;
extern int read_batch;
extern int write_batch;
extern int batch_fd;
extern int sock_f_in;
extern int sock_f_out;
extern int filesfrom_fd;
extern int connect_timeout;
extern int send_msgs_to_gen;
extern dev_t filesystem_dev;
extern pid_t cleanup_child_pid;
extern size_t bwlimit_writemax;
extern unsigned int module_dirlen;
extern BOOL flist_receiving_enabled;
extern BOOL want_progress_now;
extern BOOL shutting_down;
extern int backup_dir_len;
extern int basis_dir_cnt;
extern struct stats stats;
extern char *stdout_format;
extern char *logfile_format;
extern char *filesfrom_host;
extern char *partial_dir;
extern char *rsync_path;
extern char *shell_cmd;
extern char *password_file;
extern char *backup_dir;
extern char *copy_as;
extern char curr_dir[MAXPATHLEN];
extern char backup_dir_buf[MAXPATHLEN];
extern char *basis_dir[MAX_BASIS_DIRS+1];
extern struct file_list *first_flist;
extern filter_rule_list daemon_filter_list;
uid_t our_uid;
gid_t our_gid;
int am_receiver = 0; /* Only set to 1 after the receiver/generator fork. */
int am_generator = 0; /* Only set to 1 after the receiver/generator fork. */
int local_server = 0;
int daemon_over_rsh = 0;
mode_t orig_umask = 0;
int batch_gen_fd = -1;
int sender_keeps_checksum = 0;
int raw_argc, cooked_argc;
char **raw_argv, **cooked_argv;
/* There's probably never more than at most 2 outstanding child processes,
* but set it higher, just in case. */
#define MAXCHILDPROCS 7
#ifdef HAVE_SIGACTION
# ifdef HAVE_SIGPROCMASK
# define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
# else
# define SIGACTMASK(n,h) SIGACTION(n,h)
# endif
static struct sigaction sigact;
#endif
struct pid_status {
pid_t pid;
int status;
} pid_stat_table[MAXCHILDPROCS];
static time_t starttime, endtime;
static int64 total_read, total_written;
static void show_malloc_stats(void);
/* Works like waitpid(), but if we already harvested the child pid in our
* remember_children(), we succeed instead of returning an error. */
pid_t wait_process(pid_t pid, int *status_ptr, int flags)
{
pid_t waited_pid;
do {
waited_pid = waitpid(pid, status_ptr, flags);
} while (waited_pid == -1 && errno == EINTR);
if (waited_pid == -1 && errno == ECHILD) {
/* Status of requested child no longer available: check to
* see if it was processed by remember_children(). */
int cnt;
for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
if (pid == pid_stat_table[cnt].pid) {
*status_ptr = pid_stat_table[cnt].status;
pid_stat_table[cnt].pid = 0;
return pid;
}
}
}
return waited_pid;
}
int shell_exec(const char *cmd)
{
char *shell = getenv("RSYNC_SHELL");
int status;
pid_t pid;
if (!shell)
return system(cmd);
if ((pid = fork()) < 0)
return -1;
if (pid == 0) {
execlp(shell, shell, "-c", cmd, NULL);
_exit(1);
}
int ret = wait_process(pid, &status, 0);
return ret < 0 ? -1 : status;
}
/* Wait for a process to exit, calling io_flush while waiting. */
static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
{
pid_t waited_pid;
int status;
while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
msleep(20);
io_flush(FULL_FLUSH);
}
/* TODO: If the child exited on a signal, then log an
* appropriate error message. Perhaps we should also accept a
* message describing the purpose of the child. Also indicate
* this to the caller so that they know something went wrong. */
if (waited_pid < 0) {
rsyserr(FERROR, errno, "waitpid");
*exit_code_ptr = RERR_WAITCHILD;
} else if (!WIFEXITED(status)) {
#ifdef WCOREDUMP
if (WCOREDUMP(status))
*exit_code_ptr = RERR_CRASHED;
else
#endif
if (WIFSIGNALED(status))
*exit_code_ptr = RERR_TERMINATED;
else
*exit_code_ptr = RERR_WAITCHILD;
} else
*exit_code_ptr = WEXITSTATUS(status);
}
void write_del_stats(int f)
{
if (read_batch)
write_int(f, NDX_DEL_STATS);
else
write_ndx(f, NDX_DEL_STATS);
write_varint(f, stats.deleted_files - stats.deleted_dirs
- stats.deleted_symlinks - stats.deleted_devices
- stats.deleted_specials);
write_varint(f, stats.deleted_dirs);
write_varint(f, stats.deleted_symlinks);
write_varint(f, stats.deleted_devices);
write_varint(f, stats.deleted_specials);
}
void read_del_stats(int f)
{
stats.deleted_files = read_varint(f);
stats.deleted_files += stats.deleted_dirs = read_varint(f);
stats.deleted_files += stats.deleted_symlinks = read_varint(f);
stats.deleted_files += stats.deleted_devices = read_varint(f);
stats.deleted_files += stats.deleted_specials = read_varint(f);
}
static void become_copy_as_user()
{
char *gname;
uid_t uid;
gid_t gid;
if (!copy_as)
return;
if (DEBUG_GTE(CMD, 2))
rprintf(FINFO, "[%s] copy_as=%s\n", who_am_i(), copy_as);
if ((gname = strchr(copy_as, ':')) != NULL)
*gname++ = '\0';
if (!user_to_uid(copy_as, &uid, True)) {
rprintf(FERROR, "Invalid copy-as user: %s\n", copy_as);
exit_cleanup(RERR_SYNTAX);
}
if (gname) {
if (!group_to_gid(gname, &gid, True)) {
rprintf(FERROR, "Invalid copy-as group: %s\n", gname);
exit_cleanup(RERR_SYNTAX);
}
} else {
struct passwd *pw;
if ((pw = getpwuid(uid)) == NULL) {
rsyserr(FERROR, errno, "getpwuid failed");
exit_cleanup(RERR_SYNTAX);
}
gid = pw->pw_gid;
}
if (setgid(gid) < 0) {
rsyserr(FERROR, errno, "setgid failed");
exit_cleanup(RERR_SYNTAX);
}
#ifdef HAVE_SETGROUPS
if (setgroups(1, &gid)) {
rsyserr(FERROR, errno, "setgroups failed");
exit_cleanup(RERR_SYNTAX);
}
#endif
#ifdef HAVE_INITGROUPS
if (!gname && initgroups(copy_as, gid) < 0) {
rsyserr(FERROR, errno, "initgroups failed");
exit_cleanup(RERR_SYNTAX);
}
#endif
if (setuid(uid) < 0
#ifdef HAVE_SETEUID
|| seteuid(uid) < 0
#endif
) {
rsyserr(FERROR, errno, "setuid failed");
exit_cleanup(RERR_SYNTAX);
}
our_uid = MY_UID();
our_gid = MY_GID();
am_root = (our_uid == 0);
if (gname)
gname[-1] = ':';
}
/* This function gets called from all 3 processes. We want the client side
* to actually output the text, but the sender is the only process that has
* all the stats we need. So, if we're a client sender, we do the report.
* If we're a server sender, we write the stats on the supplied fd. If
* we're the client receiver we read the stats from the supplied fd and do
* the report. All processes might also generate a set of debug stats, if
* the verbose level is high enough (this is the only thing that the
* generator process and the server receiver ever do here). */
static void handle_stats(int f)
{
endtime = time(NULL);
/* Cache two stats because the read/write code can change it. */
total_read = stats.total_read;
total_written = stats.total_written;
if (INFO_GTE(STATS, 3)) {
/* These come out from every process */
show_malloc_stats();
show_flist_stats();
}
if (am_generator)
return;
if (am_daemon) {
if (f == -1 || !am_sender)
return;
}
if (am_server) {
if (am_sender) {
write_varlong30(f, total_read, 3);
write_varlong30(f, total_written, 3);
write_varlong30(f, stats.total_size, 3);
if (protocol_version >= 29) {
write_varlong30(f, stats.flist_buildtime, 3);
write_varlong30(f, stats.flist_xfertime, 3);
}
}
return;
}
/* this is the client */
if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
;
else if (!am_sender) {
/* Read the first two in opposite order because the meaning of
* read/write swaps when switching from sender to receiver. */
total_written = read_varlong30(f, 3);
total_read = read_varlong30(f, 3);
stats.total_size = read_varlong30(f, 3);
if (protocol_version >= 29) {
stats.flist_buildtime = read_varlong30(f, 3);
stats.flist_xfertime = read_varlong30(f, 3);
}
} else if (write_batch) {
/* The --read-batch process is going to be a client
* receiver, so we need to give it the stats. */
write_varlong30(batch_fd, total_read, 3);
write_varlong30(batch_fd, total_written, 3);
write_varlong30(batch_fd, stats.total_size, 3);
if (protocol_version >= 29) {
write_varlong30(batch_fd, stats.flist_buildtime, 3);
write_varlong30(batch_fd, stats.flist_xfertime, 3);
}
}
}
static void output_itemized_counts(const char *prefix, int *counts)
{
static char *labels[] = { "reg", "dir", "link", "dev", "special" };
char buf[1024], *pre = " (";
int j, len = 0;
int total = counts[0];
if (total) {
counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
for (j = 0; j < 5; j++) {
if (counts[j]) {
len += snprintf(buf+len, sizeof buf - len - 2,
"%s%s: %s",
pre, labels[j], comma_num(counts[j]));
pre = ", ";
}
}
buf[len++] = ')';
}
buf[len] = '\0';
rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
}
static const char *bytes_per_sec_human_dnum(void)
{
if (starttime == (time_t)-1 || endtime == (time_t)-1)
return "UNKNOWN";
return human_dnum((total_written + total_read) / (0.5 + (endtime - starttime)), 2);
}
static void output_summary(void)
{
if (INFO_GTE(STATS, 2)) {
rprintf(FCLIENT, "\n");
output_itemized_counts("Number of files", &stats.num_files);
if (protocol_version >= 29)
output_itemized_counts("Number of created files", &stats.created_files);
if (protocol_version >= 31)
output_itemized_counts("Number of deleted files", &stats.deleted_files);
rprintf(FINFO,"Number of regular files transferred: %s\n",
comma_num(stats.xferred_files));
rprintf(FINFO,"Total file size: %s bytes\n",
human_num(stats.total_size));
rprintf(FINFO,"Total transferred file size: %s bytes\n",
human_num(stats.total_transferred_size));
rprintf(FINFO,"Literal data: %s bytes\n",
human_num(stats.literal_data));
rprintf(FINFO,"Matched data: %s bytes\n",
human_num(stats.matched_data));
rprintf(FINFO,"File list size: %s\n",
human_num(stats.flist_size));
if (stats.flist_buildtime) {
rprintf(FINFO,
"File list generation time: %s seconds\n",
comma_dnum((double)stats.flist_buildtime / 1000, 3));
rprintf(FINFO,
"File list transfer time: %s seconds\n",
comma_dnum((double)stats.flist_xfertime / 1000, 3));
}
rprintf(FINFO,"Total bytes sent: %s\n",
human_num(total_written));
rprintf(FINFO,"Total bytes received: %s\n",
human_num(total_read));
}
if (INFO_GTE(STATS, 1)) {
rprintf(FCLIENT, "\n");
rprintf(FINFO,
"sent %s bytes received %s bytes %s bytes/sec\n",
human_num(total_written), human_num(total_read),
bytes_per_sec_human_dnum());
rprintf(FINFO, "total size is %s speedup is %s%s\n",
human_num(stats.total_size),
comma_dnum((double)stats.total_size / (total_written+total_read), 2),
write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
}
fflush(stdout);
fflush(stderr);
}
/**
* If our C library can get malloc statistics, then show them to FINFO
**/
static void show_malloc_stats(void)
{
#ifdef HAVE_MALLINFO
struct mallinfo mi;
mi = mallinfo();
rprintf(FCLIENT, "\n");
rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
(int)getpid(), am_server ? "server " : "",
am_daemon ? "daemon " : "", who_am_i());
rprintf(FINFO, " arena: %10ld (bytes from sbrk)\n",
(long)mi.arena);
rprintf(FINFO, " ordblks: %10ld (chunks not in use)\n",
(long)mi.ordblks);
rprintf(FINFO, " smblks: %10ld\n",
(long)mi.smblks);
rprintf(FINFO, " hblks: %10ld (chunks from mmap)\n",
(long)mi.hblks);
rprintf(FINFO, " hblkhd: %10ld (bytes from mmap)\n",
(long)mi.hblkhd);
rprintf(FINFO, " allmem: %10ld (bytes from sbrk + mmap)\n",
(long)mi.arena + mi.hblkhd);
rprintf(FINFO, " usmblks: %10ld\n",
(long)mi.usmblks);
rprintf(FINFO, " fsmblks: %10ld\n",
(long)mi.fsmblks);
rprintf(FINFO, " uordblks: %10ld (bytes used)\n",
(long)mi.uordblks);
rprintf(FINFO, " fordblks: %10ld (bytes free)\n",
(long)mi.fordblks);
rprintf(FINFO, " keepcost: %10ld (bytes in releasable chunk)\n",
(long)mi.keepcost);
#endif /* HAVE_MALLINFO */
}
/* Start the remote shell. cmd may be NULL to use the default. */
static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
int *f_in_p, int *f_out_p)
{
int i, argc = 0;
char *args[MAX_ARGS], *need_to_free = NULL;
pid_t pid;
int dash_l_set = 0;
if (!read_batch && !local_server) {
char *t, *f, in_quote = '\0';
char *rsh_env = getenv(RSYNC_RSH_ENV);
if (!cmd)
cmd = rsh_env;
if (!cmd)
cmd = RSYNC_RSH;
cmd = need_to_free = strdup(cmd);
if (!cmd)
goto oom;
for (t = f = cmd; *f; f++) {
if (*f == ' ')
continue;
/* Comparison leaves rooms for server_options(). */
if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
goto arg_overflow;
args[argc++] = t;
while (*f != ' ' || in_quote) {
if (!*f) {
if (in_quote) {
rprintf(FERROR,
"Missing trailing-%c in remote-shell command.\n",
in_quote);
exit_cleanup(RERR_SYNTAX);
}
f--;
break;
}
if (*f == '\'' || *f == '"') {
if (!in_quote) {
in_quote = *f++;
continue;
}
if (*f == in_quote && *++f != in_quote) {
in_quote = '\0';
continue;
}
}
*t++ = *f++;
}
*t++ = '\0';
}
/* check to see if we've already been given '-l user' in
* the remote-shell command */
for (i = 0; i < argc-1; i++) {
if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
dash_l_set = 1;
}
#ifdef HAVE_REMSH
/* remsh (on HPUX) takes the arguments the other way around */
args[argc++] = machine;
if (user && !(daemon_over_rsh && dash_l_set)) {
args[argc++] = "-l";
args[argc++] = user;
}
#else
if (user && !(daemon_over_rsh && dash_l_set)) {
args[argc++] = "-l";
args[argc++] = user;
}
args[argc++] = machine;
#endif
args[argc++] = rsync_path;
if (blocking_io < 0) {
char *cp;
if ((cp = strrchr(cmd, '/')) != NULL)
cp++;
else
cp = cmd;
if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
blocking_io = 1;
}
server_options(args,&argc);
if (argc >= MAX_ARGS - 2)
goto arg_overflow;
}
args[argc++] = ".";
if (!daemon_over_rsh) {
while (remote_argc > 0) {
if (argc >= MAX_ARGS - 1) {
arg_overflow:
rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
exit_cleanup(RERR_SYNTAX);
}
if (**remote_argv == '-') {
if (asprintf(args + argc++, "./%s", *remote_argv++) < 0)
out_of_memory("do_cmd");
} else
args[argc++] = *remote_argv++;
remote_argc--;
}
}
args[argc] = NULL;
if (DEBUG_GTE(CMD, 2)) {
for (i = 0; i < argc; i++)
rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
rprintf(FCLIENT, "\n");
}
if (read_batch) {
int from_gen_pipe[2];
set_allow_inc_recurse();
if (fd_pair(from_gen_pipe) < 0) {
rsyserr(FERROR, errno, "pipe");
exit_cleanup(RERR_IPC);
}
batch_gen_fd = from_gen_pipe[0];
*f_out_p = from_gen_pipe[1];
*f_in_p = batch_fd;
pid = (pid_t)-1; /* no child pid */
#ifdef ICONV_CONST
setup_iconv();
#endif
} else if (local_server) {
/* If the user didn't request --[no-]whole-file, force
* it on, but only if we're not batch processing. */
if (whole_file < 0 && !write_batch)
whole_file = 1;
set_allow_inc_recurse();
pid = local_child(argc, args, f_in_p, f_out_p, child_main);
#ifdef ICONV_CONST
setup_iconv();
#endif
} else {
pid = piped_child(args, f_in_p, f_out_p);
#ifdef ICONV_CONST
setup_iconv();
#endif
if (protect_args && !daemon_over_rsh)
send_protected_args(*f_out_p, args);
}
if (need_to_free)
free(need_to_free);
return pid;
oom:
out_of_memory("do_cmd");
return 0; /* not reached */
}
/* The receiving side operates in one of two modes:
*
* 1. it receives any number of files into a destination directory,
* placing them according to their names in the file-list.
*
* 2. it receives a single file and saves it using the name in the
* destination path instead of its file-list name. This requires a
* "local name" for writing out the destination file.
*
* So, our task is to figure out what mode/local-name we need.
* For mode 1, we change into the destination directory and return NULL.
* For mode 2, we change into the directory containing the destination
* file (if we aren't already there) and return the local-name. */
static char *get_local_name(struct file_list *flist, char *dest_path)
{
STRUCT_STAT st;
int statret;
char *cp;
if (DEBUG_GTE(RECV, 1)) {
rprintf(FINFO, "get_local_name count=%d %s\n",
file_total, NS(dest_path));
}
if (!dest_path || list_only)
return NULL;
/* Treat an empty string as a copy into the current directory. */
if (!*dest_path)
dest_path = ".";
if (daemon_filter_list.head) {
char *slash = strrchr(dest_path, '/');
if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
*slash = '\0';
else
slash = NULL;
if ((*dest_path != '.' || dest_path[1] != '\0')
&& (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
|| check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
rprintf(FERROR, "ERROR: daemon has excluded destination \"%s\"\n",
dest_path);
exit_cleanup(RERR_FILESELECT);
}
if (slash)
*slash = '/';
}
/* See what currently exists at the destination. */
if ((statret = do_stat(dest_path, &st)) == 0) {
/* If the destination is a dir, enter it and use mode 1. */
if (S_ISDIR(st.st_mode)) {
if (!change_dir(dest_path, CD_NORMAL)) {
rsyserr(FERROR, errno, "change_dir#1 %s failed",
full_fname(dest_path));
exit_cleanup(RERR_FILESELECT);
}
filesystem_dev = st.st_dev; /* ensures --force works right w/-x */
return NULL;
}
if (file_total > 1) {
rprintf(FERROR,
"ERROR: destination must be a directory when"
" copying more than 1 file\n");
exit_cleanup(RERR_FILESELECT);
}
if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
rprintf(FERROR,
"ERROR: cannot overwrite non-directory"
" with a directory\n");
exit_cleanup(RERR_FILESELECT);
}
} else if (errno != ENOENT) {
/* If we don't know what's at the destination, fail. */
rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
full_fname(dest_path));
exit_cleanup(RERR_FILESELECT);
}
cp = strrchr(dest_path, '/');
/* If we need a destination directory because the transfer is not
* of a single non-directory or the user has requested one via a
* destination path ending in a slash, create one and use mode 1. */
if (file_total > 1 || (cp && !cp[1])) {
/* Lop off the final slash (if any). */
if (cp && !cp[1])
*cp = '\0';
if (statret == 0) {
rprintf(FERROR, "ERROR: destination path is not a directory\n");
exit_cleanup(RERR_SYNTAX);
}
if (do_mkdir(dest_path, ACCESSPERMS) != 0) {
rsyserr(FERROR, errno, "mkdir %s failed",
full_fname(dest_path));
exit_cleanup(RERR_FILEIO);
}
if (flist->high >= flist->low
&& strcmp(flist->files[flist->low]->basename, ".") == 0)
flist->files[0]->flags |= FLAG_DIR_CREATED;
if (INFO_GTE(NAME, 1))
rprintf(FINFO, "created directory %s\n", dest_path);
if (dry_run) {
/* Indicate that dest dir doesn't really exist. */
dry_run++;
}
if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
rsyserr(FERROR, errno, "change_dir#2 %s failed",
full_fname(dest_path));
exit_cleanup(RERR_FILESELECT);
}
return NULL;
}
/* Otherwise, we are writing a single file, possibly on top of an
* existing non-directory. Change to the item's parent directory
* (if it has a path component), return the basename of the
* destination file as the local name, and use mode 2. */
if (!cp)
return dest_path;
if (cp == dest_path)
dest_path = "/";
*cp = '\0';
if (!change_dir(dest_path, CD_NORMAL)) {
rsyserr(FERROR, errno, "change_dir#3 %s failed",
full_fname(dest_path));
exit_cleanup(RERR_FILESELECT);
}
*cp = '/';
return cp + 1;
}
/* This function checks on our alternate-basis directories. If we're in
* dry-run mode and the destination dir does not yet exist, we'll try to
* tweak any dest-relative paths to make them work for a dry-run (the
* destination dir must be in curr_dir[] when this function is called).
* We also warn about any arg that is non-existent or not a directory. */
static void check_alt_basis_dirs(void)
{
STRUCT_STAT st;
char *slash = strrchr(curr_dir, '/');
int j;
for (j = 0; j < basis_dir_cnt; j++) {
char *bdir = basis_dir[j];
int bd_len = strlen(bdir);
if (bd_len > 1 && bdir[bd_len-1] == '/')
bdir[--bd_len] = '\0';
if (dry_run > 1 && *bdir != '/') {
int len = curr_dir_len + 1 + bd_len + 1;
char *new = new_array(char, len);
if (!new)
out_of_memory("check_alt_basis_dirs");
if (slash && strncmp(bdir, "../", 3) == 0) {
/* We want to remove only one leading "../" prefix for
* the directory we couldn't create in dry-run mode:
* this ensures that any other ".." references get
* evaluated the same as they would for a live copy. */
*slash = '\0';
pathjoin(new, len, curr_dir, bdir + 3);
*slash = '/';
} else
pathjoin(new, len, curr_dir, bdir);
basis_dir[j] = bdir = new;
}
if (do_stat(bdir, &st) < 0)
rprintf(FWARNING, "%s arg does not exist: %s\n", alt_dest_opt(0), bdir);
else if (!S_ISDIR(st.st_mode))
rprintf(FWARNING, "%s arg is not a dir: %s\n", alt_dest_opt(0), bdir);
}
}
/* This is only called by the sender. */
static void read_final_goodbye(int f_in, int f_out)
{
int i, iflags, xlen;
uchar fnamecmp_type;
char xname[MAXPATHLEN];
shutting_down = True;
if (protocol_version < 29)
i = read_int(f_in);
else {
i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
if (protocol_version >= 31 && i == NDX_DONE) {
if (am_sender)
write_ndx(f_out, NDX_DONE);
else {
if (batch_gen_fd >= 0) {
while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
read_del_stats(batch_gen_fd);
}
write_int(f_out, NDX_DONE);
}
i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
}
}
if (i != NDX_DONE) {
rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
i, who_am_i());
exit_cleanup(RERR_PROTOCOL);
}
}
static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
{
struct file_list *flist;
char *dir;
if (DEBUG_GTE(SEND, 1))
rprintf(FINFO, "server_sender starting pid=%d\n", (int)getpid());
if (am_daemon && lp_write_only(module_id)) {
rprintf(FERROR, "ERROR: module is write only\n");
exit_cleanup(RERR_SYNTAX);
}
if (am_daemon && read_only && remove_source_files) {
rprintf(FERROR,
"ERROR: --remove-%s-files cannot be used with a read-only module\n",
remove_source_files == 1 ? "source" : "sent");
exit_cleanup(RERR_SYNTAX);
}
if (argc < 1) {
rprintf(FERROR, "ERROR: do_server_sender called without args\n");
exit_cleanup(RERR_SYNTAX);
}
become_copy_as_user();
dir = argv[0];
if (!relative_paths) {
if (!change_dir(dir, CD_NORMAL)) {
rsyserr(FERROR, errno, "change_dir#3 %s failed",
full_fname(dir));
exit_cleanup(RERR_FILESELECT);
}
}
argc--;
argv++;
if (argc == 0 && (recurse || xfer_dirs || list_only)) {
argc = 1;
argv--;
argv[0] = ".";
}
flist = send_file_list(f_out,argc,argv);
if (!flist || flist->used == 0) {
/* Make sure input buffering is off so we can't hang in noop_io_until_death(). */
io_end_buffering_in(0);
/* TODO: we should really exit in a more controlled manner. */
exit_cleanup(0);
}
io_start_buffering_in(f_in);
send_files(f_in, f_out);
io_flush(FULL_FLUSH);
handle_stats(f_out);
if (protocol_version >= 24)
read_final_goodbye(f_in, f_out);
io_flush(FULL_FLUSH);
exit_cleanup(0);
}
static int do_recv(int f_in, int f_out, char *local_name)
{
int pid;
int exit_code = 0;
int error_pipe[2];
/* The receiving side mustn't obey this, or an existing symlink that
* points to an identical file won't be replaced by the referent. */
copy_links = copy_dirlinks = copy_unsafe_links = 0;
#ifdef SUPPORT_HARD_LINKS
if (preserve_hard_links && !inc_recurse)
match_hard_links(first_flist);
#endif
if (fd_pair(error_pipe) < 0) {
rsyserr(FERROR, errno, "pipe failed in do_recv");
exit_cleanup(RERR_IPC);
}
if (backup_dir) {
STRUCT_STAT st;
int ret;
if (backup_dir_len > 1)
backup_dir_buf[backup_dir_len-1] = '\0';
ret = do_stat(backup_dir_buf, &st);
if (ret != 0 || !S_ISDIR(st.st_mode)) {
if (ret == 0) {
rprintf(FERROR, "The backup-dir is not a directory: %s\n", backup_dir_buf);
exit_cleanup(RERR_SYNTAX);
}
if (errno != ENOENT) {
rprintf(FERROR, "Failed to stat %s: %s\n", backup_dir_buf, strerror(errno));
exit_cleanup(RERR_FILEIO);
}
if (INFO_GTE(BACKUP, 1))
rprintf(FINFO, "(new) backup_dir is %s\n", backup_dir_buf);
} else if (INFO_GTE(BACKUP, 1))
rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
if (backup_dir_len > 1)
backup_dir_buf[backup_dir_len-1] = '/';
}
io_flush(FULL_FLUSH);
if ((pid = do_fork()) == -1) {
rsyserr(FERROR, errno, "fork failed in do_recv");
exit_cleanup(RERR_IPC);
}
if (pid == 0) {
am_receiver = 1;
send_msgs_to_gen = am_server;
close(error_pipe[0]);
/* We can't let two processes write to the socket at one time. */
io_end_multiplex_out(MPLX_SWITCHING);
if (f_in != f_out)
close(f_out);
sock_f_out = -1;
f_out = error_pipe[1];
bwlimit_writemax = 0; /* receiver doesn't need to do this */