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d8cc8daef9
need...but most of it remains.
181 lines
5.1 KiB
C
181 lines
5.1 KiB
C
/*
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* Routines used to setup various kinds of inter-process pipes.
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*
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* Copyright (C) 1996-2000 Andrew Tridgell
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* Copyright (C) 1996 Paul Mackerras
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* Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
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* Copyright (C) 2004-2014 Wayne Davison
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, visit the http://fsf.org website.
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*/
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#include "rsync.h"
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extern int am_sender;
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extern int am_server;
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extern int blocking_io;
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extern int filesfrom_fd;
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extern int munge_symlinks;
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extern char *logfile_name;
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extern int remote_option_cnt;
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extern const char **remote_options;
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extern struct chmod_mode_struct *chmod_modes;
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/**
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* Create a child connected to us via its stdin/stdout.
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*
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* This is derived from CVS code
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*
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* Note that in the child STDIN is set to blocking and STDOUT
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* is set to non-blocking. This is necessary as rsh relies on stdin being blocking
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* and ssh relies on stdout being non-blocking
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*
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* If blocking_io is set then use blocking io on both fds. That can be
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* used to cope with badly broken rsh implementations like the one on
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* Solaris.
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**/
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pid_t piped_child(char **command, int *f_in, int *f_out)
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{
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pid_t pid;
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int to_child_pipe[2];
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int from_child_pipe[2];
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if (DEBUG_GTE(CMD, 1))
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print_child_argv("opening connection using:", command);
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if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) {
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rsyserr(FERROR, errno, "pipe");
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exit_cleanup(RERR_IPC);
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}
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pid = do_fork();
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if (pid == -1) {
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rsyserr(FERROR, errno, "fork");
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exit_cleanup(RERR_IPC);
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}
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if (pid == 0) {
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if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
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close(to_child_pipe[1]) < 0 ||
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close(from_child_pipe[0]) < 0 ||
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dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
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rsyserr(FERROR, errno, "Failed to dup/close");
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exit_cleanup(RERR_IPC);
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}
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if (to_child_pipe[0] != STDIN_FILENO)
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close(to_child_pipe[0]);
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if (from_child_pipe[1] != STDOUT_FILENO)
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close(from_child_pipe[1]);
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set_blocking(STDIN_FILENO);
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if (blocking_io > 0)
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set_blocking(STDOUT_FILENO);
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execvp(command[0], command);
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rsyserr(FERROR, errno, "Failed to exec %s", command[0]);
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exit_cleanup(RERR_IPC);
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}
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if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) {
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rsyserr(FERROR, errno, "Failed to close");
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exit_cleanup(RERR_IPC);
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}
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*f_in = from_child_pipe[0];
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*f_out = to_child_pipe[1];
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return pid;
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}
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/* This function forks a child which calls child_main(). First,
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* however, it has to establish communication paths to and from the
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* newborn child. It creates two socket pairs -- one for writing to
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* the child (from the parent) and one for reading from the child
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* (writing to the parent). Since that's four socket ends, each
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* process has to close the two ends it doesn't need. The remaining
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* two socket ends are retained for reading and writing. In the
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* child, the STDIN and STDOUT file descriptors refer to these
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* sockets. In the parent, the function arguments f_in and f_out are
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* set to refer to these sockets. */
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pid_t local_child(int argc, char **argv, int *f_in, int *f_out,
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int (*child_main)(int, char*[]))
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{
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pid_t pid;
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int to_child_pipe[2];
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int from_child_pipe[2];
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/* The parent process is always the sender for a local rsync. */
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assert(am_sender);
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if (fd_pair(to_child_pipe) < 0 ||
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fd_pair(from_child_pipe) < 0) {
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rsyserr(FERROR, errno, "pipe");
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exit_cleanup(RERR_IPC);
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}
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pid = do_fork();
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if (pid == -1) {
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rsyserr(FERROR, errno, "fork");
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exit_cleanup(RERR_IPC);
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}
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if (pid == 0) {
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am_sender = 0;
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am_server = 1;
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filesfrom_fd = -1;
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munge_symlinks = 0; /* Each side needs its own option. */
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chmod_modes = NULL; /* Let the sending side handle this. */
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/* Let the client side handle this. */
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if (logfile_name) {
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logfile_name = NULL;
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logfile_close();
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}
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if (remote_option_cnt) {
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int rc = remote_option_cnt + 1;
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const char **rv = remote_options;
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if (!parse_arguments(&rc, &rv)) {
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option_error();
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exit_cleanup(RERR_SYNTAX);
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}
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}
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if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
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close(to_child_pipe[1]) < 0 ||
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close(from_child_pipe[0]) < 0 ||
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dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
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rsyserr(FERROR, errno, "Failed to dup/close");
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exit_cleanup(RERR_IPC);
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}
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if (to_child_pipe[0] != STDIN_FILENO)
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close(to_child_pipe[0]);
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if (from_child_pipe[1] != STDOUT_FILENO)
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close(from_child_pipe[1]);
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#ifdef ICONV_CONST
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setup_iconv();
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#endif
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child_main(argc, argv);
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}
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if (close(from_child_pipe[1]) < 0 ||
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close(to_child_pipe[0]) < 0) {
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rsyserr(FERROR, errno, "Failed to close");
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exit_cleanup(RERR_IPC);
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}
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*f_in = from_child_pipe[0];
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*f_out = to_child_pipe[1];
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return pid;
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}
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