108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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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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#define _GNU_SOURCE
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include "qrexec.h"
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int connect_unix_socket()
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{
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int s, len;
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struct sockaddr_un remote;
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if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
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perror("socket");
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return -1;
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}
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remote.sun_family = AF_UNIX;
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strncpy(remote.sun_path, QREXEC_AGENT_FDPASS_PATH,
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sizeof(remote.sun_path));
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len = strlen(remote.sun_path) + sizeof(remote.sun_family);
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if (connect(s, (struct sockaddr *) &remote, len) == -1) {
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perror("connect");
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exit(1);
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}
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return s;
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}
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char *get_program_name(char *prog)
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{
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char *basename = rindex(prog, '/');
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if (basename)
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return basename + 1;
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else
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return prog;
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}
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int main(int argc, char **argv)
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{
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int trigger_fd;
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struct trigger_connect_params params;
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int local_fd[3], remote_fd[3];
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int i;
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if (argc < 4) {
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fprintf(stderr,
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"usage: %s target_vmname program_ident local_program [local program arguments]\n",
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argv[0]);
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exit(1);
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}
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trigger_fd = open(QREXEC_AGENT_TRIGGER_PATH, O_WRONLY);
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if (trigger_fd < 0) {
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perror("open QREXEC_AGENT_TRIGGER_PATH");
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exit(1);
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}
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for (i = 0; i < 3; i++) {
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local_fd[i] = connect_unix_socket();
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read(local_fd[i], &remote_fd[i], sizeof(remote_fd[i]));
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if (i != 2 || getenv("PASS_LOCAL_STDERR")) {
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char * env;
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asprintf(&env, "SAVED_FD_%d=%d", i, dup(i));
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putenv(env);
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dup2(local_fd[i], i);
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close(local_fd[i]);
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}
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}
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memset(¶ms, 0, sizeof(params));
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strncpy(params.exec_index, argv[2], sizeof(params.exec_index));
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strncpy(params.target_vmname, argv[1],
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sizeof(params.target_vmname));
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snprintf(params.process_fds.ident,
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sizeof(params.process_fds.ident), "%d %d %d",
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remote_fd[0], remote_fd[1], remote_fd[2]);
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write(trigger_fd, ¶ms, sizeof(params));
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close(trigger_fd);
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argv[3] = get_program_name(argv[3]);
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execv(argv[1], argv + 3);
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perror("execv");
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return 1;
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}
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