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/* Copyright (c) 2015 Red Hat, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of version 2 the GNU General Public License as
* published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Written by Matus Marhefka <mmarhefk@redhat.com>
*
***********************************************************************
* Enters the namespace(s) of a process specified by a PID and then executes
* the indicated program inside that namespace(s).
*
*/
#define _GNU_SOURCE
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "test.h"
#include "lapi/syscalls.h"
#include "lapi/sched.h"
#include "ns_common.h"
char *TCID = "ns_exec";
int ns_fd[NS_TOTAL];
int ns_fds;
void print_help(void)
{
int i;
printf("usage: ns_exec <NS_PID> <%s", params[0].name);
for (i = 1; params[i].name; i++)
printf("|,%s", params[i].name);
printf("> <PROGRAM> [ARGS]\nSecond argument indicates the types"
" of a namespaces maintained by NS_PID\nand is specified"
" as a comma separated list.\nExample: ns_exec 1234 net,ipc"
" ip a\n");
}
static int open_ns_fd(const char *pid, const char *ns)
{
int fd;
char file_buf[30];
sprintf(file_buf, "%s/%s/ns/%s", PROC_PATH, pid, ns);
fd = open(file_buf, O_RDONLY);
if (fd > 0) {
ns_fd[ns_fds] = fd;
++ns_fds;
return 0;
} else if (fd == -1 && errno != ENOENT) {
tst_resm(TINFO | TERRNO, "open");
return -1;
}
return 0;
}
static void close_ns_fd(void)
{
int i;
for (i = 0; i < ns_fds; i++)
close(ns_fd[i]);
}
static int child_fn(void *arg)
{
char **args = (char **)arg;
execvp(args[3], args+3);
tst_resm(TINFO | TERRNO, "execvp");
return 1;
}
/*
* ./ns_exec <NS_PID> <ipc,mnt,net,pid,user,uts> <PROGRAM> [ARGS]
*/
int main(int argc, char *argv[])
{
int i, rv, pid;
char *token;
rv = syscall(__NR_setns, -1, 0);
if (rv == -1 && errno == ENOSYS) {
tst_resm(TINFO, "setns is not supported in the kernel");
return 1;
}
if (argc < 4) {
print_help();
return 1;
}
memset(ns_fd, 0, sizeof(ns_fd));
while ((token = strsep(&argv[2], ","))) {
struct param *p = get_param(token);
if (!p) {
tst_resm(TINFO, "Unknown namespace: %s", token);
print_help();
return 1;
}
if (open_ns_fd(argv[1], token) != 0)
return 1;
}
if (ns_fds == 0) {
tst_resm(TINFO, "no namespace entries in /proc/%s/ns/",
argv[1]);
return 1;
}
for (i = 0; i < ns_fds; i++) {
if (syscall(__NR_setns, ns_fd[i], 0) == -1) {
tst_resm(TINFO | TERRNO, "setns");
close_ns_fd();
return 1;
}
}
pid = ltp_clone_quick(SIGCHLD, (void *)child_fn, (void *)argv);
if (pid == -1) {
tst_resm(TINFO | TERRNO, "ltp_clone_quick");
close_ns_fd();
return 1;
}
if (waitpid(pid, &rv, 0) == -1) {
tst_resm(TINFO | TERRNO, "waitpid");
return 1;
}
close_ns_fd();
if (WIFEXITED(rv))
return WEXITSTATUS(rv);
return 0;
}
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