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      1 /* Copyright (c) 2015 Red Hat, Inc.
      2  *
      3  * This program is free software: you can redistribute it and/or modify
      4  * it under the terms of version 2 the GNU General Public License as
      5  * published by the Free Software Foundation.
      6  *
      7  * This program is distributed in the hope that it will be useful,
      8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     10  * GNU General Public License for more details.
     11  *
     12  * You should have received a copy of the GNU General Public License
     13  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     14  *
     15  * Written by Matus Marhefka <mmarhefk (at) redhat.com>
     16  *
     17  ***********************************************************************
     18  * Creates a child process in the new specified namespace(s), child is then
     19  * daemonized and is running in the background. PID of the daemonized child
     20  * process is printed on the stdout. As the new namespace(s) is(are) maintained
     21  * by the daemonized child process it(they) can be removed by killing this
     22  * process.
     23  *
     24  */
     25 
     26 #define _GNU_SOURCE
     27 #include <sched.h>
     28 #include <sys/syscall.h>
     29 #include <sys/types.h>
     30 #include <sys/stat.h>
     31 #include <unistd.h>
     32 #include <string.h>
     33 #include <strings.h>
     34 #include <errno.h>
     35 #include "test.h"
     36 #include "lapi/namespaces_constants.h"
     37 #include "ns_common.h"
     38 
     39 char *TCID = "ns_create";
     40 
     41 
     42 void print_help(void)
     43 {
     44 	int i;
     45 
     46 	printf("usage: ns_create <%s", params[0].name);
     47 
     48 	for (i = 1; params[i].name; i++)
     49 		printf("|,%s", params[i].name);
     50 	printf(">\nThe only argument is a comma separated list "
     51 	       "of namespaces to create.\nExample: ns_create net,ipc\n");
     52 }
     53 
     54 static int child_fn(void *arg LTP_ATTRIBUTE_UNUSED)
     55 {
     56 	int i;
     57 
     58 	if (setsid() == -1) {
     59 		tst_resm(TINFO | TERRNO, "setsid");
     60 		exit(1);
     61 	}
     62 
     63 	if (chdir("/") == -1) {
     64 		tst_resm(TINFO | TERRNO, "chdir");
     65 		exit(1);
     66 	}
     67 
     68 	/* close all inherrited file descriptors */
     69 	for (i = 0; i < sysconf(_SC_OPEN_MAX); i++)
     70 		close(i);
     71 
     72 	pause();
     73 	return 0;
     74 }
     75 
     76 /*
     77  * ./ns_create <ipc,mnt,net,pid,user,uts>
     78  */
     79 int main(int argc, char *argv[])
     80 {
     81 	int pid, flags;
     82 	char *token;
     83 
     84 	if (argc < 2) {
     85 		print_help();
     86 		return 1;
     87 	}
     88 
     89 	flags = 0;
     90 	while ((token = strsep(&argv[1], ","))) {
     91 		struct param *p = get_param(token);
     92 
     93 		if (!p) {
     94 			tst_resm(TINFO, "Unknown namespace: %s", token);
     95 			print_help();
     96 			return 1;
     97 		}
     98 
     99 		flags |= p->flag;
    100 	}
    101 
    102 	pid = ltp_clone_quick(flags | SIGCHLD, child_fn, NULL);
    103 	if (pid == -1) {
    104 		tst_resm(TINFO | TERRNO, "ltp_clone_quick");
    105 		return 1;
    106 	}
    107 
    108 	printf("%d", pid);
    109 	return 0;
    110 }
    111