Attachment 666220 Details for Bug 872634 – sample program to run setns from the command line

sample program to run setns from the command line

setns.c (text/x-csrc), 2.38 KB, created by Neil Horman on 2012-12-19 16:20:35 UTC

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Creator: Neil Horman

Created: 2012-12-19 16:20:35 UTC

Size: 2.38 KB

patch

obsolete

>/*
> * setns(1) - command-line interface for setns(2)
> *
> * Copyright (C) 2012 Neil Horman <nhorman@tuxdriver.com> 
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms of the GNU General Public License as published by the
> * Free Software Foundation; either version 2, or (at your option) any
> * later version.
> *
> * 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, write to the Free Software Foundation, Inc.,
> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> */
>#include <stdlib.h>
>#include <stdio.h>
>#include <limits.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <fcntl.h>
>#include <getopt.h>
>#include <unistd.h>
>
>
>struct option lopts[] = {
>	{"help", 0, NULL, 'h'},
>	{"ipc", 1, NULL, 'i'},
>	{"net", 1, NULL, 'n'},
>	{"uts", 1, NULL, 'u'},
>	{0, 0, 0, 0},
>};
>
>static void usage(char **argv)
>{
>	printf("%s [--ipc|-i=<pid>] [--net|-n=pid] [--uts|-u=pid] <command>\n",
>		argv[0]); 
>}
>
>static int switch_namespace(const char *name, unsigned long pid)
>{
>	int fd;
>	char path[256];
>	
>	sprintf(path, "/proc/%d/ns/%s", pid, name);
>
>	fd = open(path, O_RDONLY);
>	if (fd < 0)
>		return -1;
>
>	if (setns(fd, 0) < 0) {
>		perror("Setns failed: ");
>		return -1;
>	}
>	return 0;
>}
>
>int main(int argc, char **argv)
>{
>	int opt;
>	int longind;
>	int execind = argc+1;
>	unsigned long pid;
>	int rc = 0;
>
>	while ((opt = getopt_long(argc, argv,
>		"hi:n:u:", lopts, &longind)) != -1) { 
>
>		switch (opt) {
>		case '?':
>			usage(argv);
>			exit(0);
>		case 'h':
>			usage(argv);
>			exit(0);
>
>		case 'i':
>		case 'n':
>		case 'u':
>			pid = strtoul(optarg, NULL, 10);
>			if (pid == ULONG_MAX) {
>				rc = 1;
>				printf("%s pid not properly specified\n",
>					lopts[longind].name);
>				goto out;
>			}
>			rc = switch_namespace(lopts[longind].name, pid);
>			if (rc < 0) {
>				printf("setns failed for %s\n",
>					lopts[longind].name);
>				goto out;
>			}
>			break;
>
>		}
>	}
>
>	if (optind == argc) {
>		printf("executable not properly specified\n");
>		rc = 1;
>		goto out;
>	}
>	execind = optind;
>
>execute:
>	rc = execvp(argv[execind], &argv[execind]);
>	if (rc < 0)
>		perror("execv failed: ");
>out:
>	return rc;			
>}
>

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Attachments on bug 872634: 646534 | 646535 | 655182 | 666220