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109 lines
3.2 KiB
109 lines
3.2 KiB
/*
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* The Qubes OS Project, http://www.qubes-os.org
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*
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* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include "qrexec.h"
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#include "libqrexec-utils.h"
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static do_exec_t *exec_func = NULL;
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void register_exec_func(do_exec_t *func) {
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exec_func = func;
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}
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void exec_qubes_rpc_if_requested(char *prog, char *const envp[]) {
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/* avoid calling qubes-rpc-multiplexer through shell */
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if (strncmp(prog, RPC_REQUEST_COMMAND, RPC_REQUEST_COMMAND_LEN) == 0) {
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char *tok;
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char *argv[16]; // right now 6 are used, but allow future extensions
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size_t i = 0;
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tok=strtok(prog, " ");
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do {
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if (i >= sizeof(argv)/sizeof(argv[0])-1) {
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fprintf(stderr, "To many arguments to %s\n", RPC_REQUEST_COMMAND);
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exit(1);
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}
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argv[i++] = tok;
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} while ((tok=strtok(NULL, " ")));
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argv[i] = NULL;
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argv[0] = QUBES_RPC_MULTIPLEXER_PATH;
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execve(QUBES_RPC_MULTIPLEXER_PATH, argv, envp);
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perror("exec qubes-rpc-multiplexer");
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exit(1);
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}
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}
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void fix_fds(int fdin, int fdout, int fderr)
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{
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int i;
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for (i = 0; i < 256; i++)
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if (i != fdin && i != fdout && i != fderr)
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close(i);
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dup2(fdin, 0);
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dup2(fdout, 1);
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dup2(fderr, 2);
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close(fdin);
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close(fdout);
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if (fderr != 2)
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close(fderr);
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}
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void do_fork_exec(const char *cmdline, int *pid, int *stdin_fd, int *stdout_fd,
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int *stderr_fd)
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{
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int inpipe[2], outpipe[2], errpipe[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, inpipe) ||
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socketpair(AF_UNIX, SOCK_STREAM, 0, outpipe) ||
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(stderr_fd && socketpair(AF_UNIX, SOCK_STREAM, 0, errpipe))) {
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perror("socketpair");
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exit(1);
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}
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switch (*pid = fork()) {
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case -1:
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perror("fork");
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exit(-1);
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case 0:
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if (stderr_fd) {
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fix_fds(inpipe[0], outpipe[1], errpipe[1]);
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} else
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fix_fds(inpipe[0], outpipe[1], 2);
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if (exec_func != NULL)
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exec_func((char*)cmdline);
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exit(-1);
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default:;
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}
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close(inpipe[0]);
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close(outpipe[1]);
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*stdin_fd = inpipe[1];
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*stdout_fd = outpipe[0];
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if (stderr_fd) {
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close(errpipe[1]);
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*stderr_fd = errpipe[0];
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}
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}
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