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criu/crtools.c
Andrey Vagin ae70bc0ad6 net: add ability to set names for outside links of veth devices 
When restoring a container crtools create veth pair inside it and then
pushed one end to the namespaces crtools live in (outside). To facilitate
the subsequent management of the otter end of the veth pair this option
is added -- one can specifu a name by which the respective end would be
visible. E.g.: --veth-pair eth0=veth101.0

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-09-02 01:07:32 +04:00

314 lines
7.7 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
#include <getopt.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "types.h"
#include "compiler.h"
#include "crtools.h"
#include "sockets.h"
#include "syscall.h"
#include "files.h"
#include "sk-inet.h"
#include "net.h"
struct cr_options opts;
static int parse_ns_string(const char *ptr)
{
const char *end = ptr + strlen(ptr);
do {
if (ptr[3] != ',' && ptr[3] != '\0')
goto bad_ns;
if (!strncmp(ptr, "uts", 3))
opts.namespaces_flags |= CLONE_NEWUTS;
else if (!strncmp(ptr, "ipc", 3))
opts.namespaces_flags |= CLONE_NEWIPC;
else if (!strncmp(ptr, "mnt", 3))
opts.namespaces_flags |= CLONE_NEWNS;
else if (!strncmp(ptr, "pid", 3))
opts.namespaces_flags |= CLONE_NEWPID;
else if (!strncmp(ptr, "net", 3))
opts.namespaces_flags |= CLONE_NEWNET;
else
goto bad_ns;
ptr += 4;
} while (ptr < end);
return 0;
bad_ns:
pr_err("Unknown namespace '%s'\n", ptr);
return -1;
}
int main(int argc, char *argv[])
{
pid_t pid = 0;
int ret = -1;
int opt, idx;
int log_inited = 0;
int log_level = 0;
static const char short_opts[] = "dsf:t:hcD:o:n:vxVr:";
BUILD_BUG_ON(PAGE_SIZE != PAGE_IMAGE_SIZE);
cr_pb_init();
if (argc < 2)
goto usage;
/* Default options */
opts.final_state = TASK_DEAD;
INIT_LIST_HEAD(&opts.veth_pairs);
while (1) {
static struct option long_opts[] = {
{ "tree", required_argument, 0, 't' },
{ "leave-stopped", no_argument, 0, 's' },
{ "restore-detached", no_argument, 0, 'd' },
{ "contents", no_argument, 0, 'c' },
{ "file", required_argument, 0, 'f' },
{ "images-dir", required_argument, 0, 'D' },
{ "log-file", required_argument, 0, 'o' },
{ "namespaces", required_argument, 0, 'n' },
{ "root", required_argument, 0, 'r' },
{ "ext-unix-sk", no_argument, 0, 'x' },
{ "help", no_argument, 0, 'h' },
{ SK_EST_PARAM, no_argument, 0, 42 },
{ "close", required_argument, 0, 43 },
{ "log-pid", no_argument, 0, 44},
{ "version", no_argument, 0, 'V'},
{ "evasive-devices", no_argument, 0, 45},
{ "pidfile", required_argument, 0, 46},
{ "veth-pair", required_argument, 0, 47},
{ },
};
opt = getopt_long(argc, argv, short_opts, long_opts, &idx);
if (opt == -1)
break;
switch (opt) {
case 's':
opts.final_state = TASK_STOPPED;
break;
case 'x':
opts.ext_unix_sk = true;
break;
case 't':
pid = atoi(optarg);
break;
case 'c':
opts.show_pages_content = true;
break;
case 'f':
opts.show_dump_file = optarg;
break;
case 'r':
opts.root = optarg;
break;
case 'd':
opts.restore_detach = true;
break;
case 'D':
if (chdir(optarg)) {
pr_perror("Can't change directory to %s",
optarg);
return -1;
}
break;
case 'o':
opts.output = strdup(optarg);
if (log_init(optarg))
return -1;
log_inited = 1;
break;
case 'n':
if (parse_ns_string(optarg))
return -1;
break;
case 'v':
if (optind < argc - 1) {
char *opt = argv[optind];
if (isdigit(*opt)) {
log_level = -atoi(opt);
optind++;
} else {
if (log_level >= 0)
log_level++;
}
} else {
if (log_level >= 0)
log_level++;
}
break;
case 42:
pr_info("Will dump TCP connections\n");
opts.tcp_established_ok = true;
break;
case 43: {
int fd;
fd = atoi(optarg);
pr_info("Closing fd %d\n", fd);
close(fd);
break;
}
case 44:
opts.log_file_per_pid = 1;
break;
case 45:
opts.evasive_devices = true;
break;
case 46:
opts.pidfile = optarg;
break;
case 47:
{
struct veth_pair *n;
n = xmalloc(sizeof(*n));
if (n == NULL)
return -1;
n->outside = strchr(optarg, '=');
if (n->outside == NULL) {
xfree(n);
pr_err("Invalid agument for --veth-pair\n");
goto usage;
}
*n->outside++ = '\0';
n->inside = optarg;
list_add(&n->node, &opts.veth_pairs);
}
break;
case 'V':
pr_msg("Version: %d.%d\n", CRIU_VERSION_MAJOR, CRIU_VERSION_MINOR);
return 0;
case 'h':
default:
goto usage;
}
}
if (log_level < 0)
log_level = -log_level;
log_set_loglevel(log_level);
if (!log_inited) {
ret = log_init(NULL);
if (ret)
return ret;
}
ret = open_image_dir();
if (ret < 0) {
pr_perror("can't open currect directory");
return -1;
}
if (optind >= argc)
goto usage;
if (strcmp(argv[optind], "dump") &&
strcmp(argv[optind], "restore") &&
strcmp(argv[optind], "show") &&
strcmp(argv[optind], "check")) {
pr_err("Unknown command %s", argv[optind]);
goto usage;
}
switch (argv[optind][0]) {
case 'd':
if (!pid)
goto opt_pid_missing;
ret = cr_dump_tasks(pid, &opts);
break;
case 'r':
if (!pid)
goto opt_pid_missing;
ret = cr_restore_tasks(pid, &opts);
break;
case 's':
ret = cr_show(&opts);
break;
case 'c':
ret = cr_check();
break;
default:
goto usage;
break;
}
return ret;
usage:
pr_msg("\nUsage:\n");
pr_msg(" %s dump -t pid [<options>]\n", argv[0]);
pr_msg(" %s restore -t pid [<options>]\n", argv[0]);
pr_msg(" %s show (-D dir)|(-f file) [<options>]\n", argv[0]);
pr_msg(" %s check\n", argv[0]);
pr_msg("\nCommands:\n");
pr_msg(" dump checkpoint a process/tree identified by pid\n");
pr_msg(" restore restore a process/tree identified by pid\n");
pr_msg(" show show dump file(s) contents\n");
pr_msg(" check checks whether the kernel support is up-to-date\n");
pr_msg("\nDump/Restore options:\n");
pr_msg("\n* Generic:\n");
pr_msg(" -t|--tree checkpoint/restore the whole process tree identified by pid\n");
pr_msg(" -d|--restore-detached detach after restore\n");
pr_msg(" -s|--leave-stopped leave tasks in stopped state after checkpoint instead of killing them\n");
pr_msg(" -D|--images-dir directory where to put images to\n");
pr_msg(" --pidfile [FILE] write a pid of a root task in this file\n");
pr_msg("\n* Special resources support:\n");
pr_msg(" -n|--namespaces checkpoint/restore namespaces - values must be separated by comma\n");
pr_msg(" supported: uts, ipc, mnt, pid, net\n");
pr_msg(" -x|--ext-unix-sk allow external unix connections\n");
pr_msg(" --%s checkpoint/restore established TCP connections\n", SK_EST_PARAM);
pr_msg(" -r|--root [PATH] change the root filesystem (when run in mount namespace)\n");
pr_msg(" --evasive-devices use any path to a device file if the original one is inaccessible\n");
pr_msg(" --veth-pair [IN=OUT] correspondence between outside and inside names of veth devices\n");
pr_msg("\n* Logging:\n");
pr_msg(" -o|--log-file [NAME] log file name (relative path is relative to --images-dir)\n");
pr_msg(" --log-pid if the -o option is in effect, each restored processes is\n");
pr_msg(" written to the [NAME].pid file\n");
pr_msg(" -v [num] set logging level\n");
pr_msg(" 0 - silent (only error messages)\n");
pr_msg(" 1 - informative (default)\n");
pr_msg(" 2 - debug\n");
pr_msg(" -vv same as -v 1\n");
pr_msg(" -vvv same as -v 2\n");
pr_msg("\nShow options:\n");
pr_msg(" -f|--file show contents of a checkpoint file\n");
pr_msg(" -D|--images-dir directory where to get images from\n");
pr_msg(" -c|--contents show contents of pages dumped in hexdump format\n");
pr_msg("\nOther options:\n");
pr_msg(" -h|--help show this text\n");
pr_msg(" -V|--version show version\n");
return -1;
opt_pid_missing:
pr_msg("No pid specified (-t option missing)\n");
return -1;
}
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