#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
+#include <ifaddrs.h>
+#include <stddef.h>
+#include <fcntl.h>
+#include <sys/mount.h>
+#include <utmp.h>
#include "config.h"
#include "pathconfig.h"
return list;
}
+static const struct AF_to_vcNET {
+ int af;
+ vc_net_nx_type vc_net;
+ size_t len;
+ size_t offset;
+} converter[] = {
+ { AF_INET, vcNET_IPV4, sizeof(struct in_addr), offsetof(struct sockaddr_in, sin_addr.s_addr) },
+ { AF_INET6, vcNET_IPV6, sizeof(struct in6_addr), offsetof(struct sockaddr_in6, sin6_addr.s6_addr) },
+ { 0, 0, 0, 0 }
+};
+
static inline int
-convertAddress(const char *str, vc_net_nx_type *type, void *dst)
+convert_address(const char *str, vc_net_nx_type *type, void *dst)
{
- int ret;
- if (type) *type = vcNET_IPV4;
- ret = inet_pton(AF_INET, str, dst);
- if (ret==0) {
- if (type) *type = vcNET_IPV6;
- ret = inet_pton(AF_INET6, str, dst);
+ const struct AF_to_vcNET *i;
+ for (i = converter; i->af; i++) {
+ if (inet_pton(i->af, str, dst)) {
+ *type = i->vc_net;
+ return 0;
+ }
}
- return ret > 0 ? 0 : -1;
+ return -1;
+}
+
+static int
+get_mask(struct vc_net_nx *addr)
+{
+ const struct AF_to_vcNET *i;
+ struct ifaddrs *head, *ifa;
+ int ret = 0;
+
+ for (i = converter; i->af; i++) {
+ if (i->vc_net == addr->type)
+ break;
+ }
+ if (!i) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (getifaddrs(&head) == -1)
+ return -1;
+ for (ifa = head; ifa; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr->sa_family == i->af &&
+ memcmp((char *) ifa->ifa_addr + i->offset, addr->ip, i->len) == 0) {
+ switch (addr->type) {
+ case vcNET_IPV4:
+ memcpy(&addr->mask[0], ifa->ifa_netmask + i->offset, i->len);
+ break;
+ case vcNET_IPV6: {
+ uint32_t *m = ((struct sockaddr_in6 *) ifa->ifa_netmask)->sin6_addr.s6_addr32;
+ /* optimization for the common case */
+ if ((m[1] & 1) == 1 && (m[2] & 0x80000000) == 0)
+ addr->mask[0] = 64;
+ else {
+ addr->mask[0] = 0;
+ while (m[addr->mask[0] / 32] & (addr->mask[0] % 32))
+ addr->mask[0]++;
+ }
+ break;
+ }
+ }
+ ret = 1;
+ break;
+ }
+ }
+ /* no match, use a default */
+ if (!ret) {
+ switch (addr->type) {
+ case vcNET_IPV4: addr->mask[0] = htonl(0xffffff00); break;
+ case vcNET_IPV6: addr->mask[0] = 64; break;
+ default: addr->mask[0] = 0; break;
+ }
+ }
+ freeifaddrs(head);
+ return ret;
}
/* XXX These two functions are really similar */
if (!PyArg_ParseTuple(args, "Is", &nid, &ip))
return NULL;
- if (convertAddress(ip, &addr.type, &addr.ip) == -1)
+ if (convert_address(ip, &addr.type, &addr.ip) == -1)
return PyErr_Format(PyExc_ValueError, "%s is not a valid IP address", ip);
- switch (addr.type) {
- case vcNET_IPV4: addr.mask[0] = htonl(0xffffff00); break;
- case vcNET_IPV6: addr.mask[0] = 64; break;
- default: addr.mask[0] = 0; break;
+ switch (get_mask(&addr)) {
+ case -1:
+ return PyErr_SetFromErrno(PyExc_OSError);
+ case 0:
+ /* XXX error here? */
+ break;
}
addr.count = 1;
else if (strcmp(ip, "all6") == 0)
addr.type = vcNET_IPV6A;
else
- if (convertAddress(ip, &addr.type, &addr.ip) == -1)
+ if (convert_address(ip, &addr.type, &addr.ip) == -1)
return PyErr_Format(PyExc_ValueError, "%s is not a valid IP address", ip);
- switch (addr.type) {
- case vcNET_IPV4: addr.mask[0] = htonl(0xffffff00); break;
- case vcNET_IPV6: addr.mask[0] = 64; break;
- default: addr.mask[0] = 0; break;
+ switch (get_mask(&addr)) {
+ case -1:
+ return PyErr_SetFromErrno(PyExc_OSError);
}
addr.count = 1;
return NONE;
}
+struct secure_dirs {
+ int host_fd;
+ int cwd_fd;
+ int guest_fd;
+ int target_fd;
+};
+
+static inline int
+fchroot(int fd)
+{
+ if (fchdir(fd) == -1 || chroot(".") == -1)
+ return -1;
+ return 0;
+}
+
+static inline int
+restore_dirs(struct secure_dirs *dirs)
+{
+ if (dirs->host_fd != -1) {
+ if (fchroot(dirs->host_fd) == -1)
+ return -1;
+ if (close(dirs->host_fd) == -1)
+ return -1;
+ }
+ if (dirs->guest_fd != -1) {
+ if (close(dirs->guest_fd) == -1)
+ return -1;
+ }
+ if (dirs->target_fd != -1) {
+ if (close(dirs->target_fd) == -1)
+ return -1;
+ }
+ if (dirs->cwd_fd != -1) {
+ if (fchdir(dirs->cwd_fd) == -1)
+ return -1;
+ if (close(dirs->cwd_fd) == -1)
+ return -1;
+ }
+ return 0;
+}
+
+static inline int
+secure_chdir(struct secure_dirs *dirs, const char *guest, const char *target)
+{
+ dirs->host_fd = dirs->cwd_fd = dirs->guest_fd = dirs->target_fd = -1;
+
+ dirs->host_fd = open("/", O_RDONLY|O_DIRECTORY);
+ if (dirs->host_fd == -1)
+ return -1;
+
+ dirs->cwd_fd = open(".", O_RDONLY|O_DIRECTORY);
+ if (dirs->cwd_fd == -1)
+ return -1;
+
+ dirs->guest_fd = open(guest, O_RDONLY|O_DIRECTORY);
+ if (dirs->guest_fd == -1)
+ return -1;
+ if (fchroot(dirs->guest_fd) == -1)
+ return -1;
+
+ dirs->target_fd = open(target, O_RDONLY|O_DIRECTORY);
+ if (dirs->target_fd == -1)
+ return -1;
+
+ if (fchroot(dirs->host_fd) == -1 || close(dirs->host_fd) == -1)
+ return -1;
+ dirs->host_fd = -1;
+ if (close(dirs->guest_fd) == -1)
+ return -1;
+ dirs->guest_fd = -1;
+
+ if (fchdir(dirs->target_fd) == -1 || close(dirs->target_fd) == -1)
+ return -1;
+
+ return 0;
+}
+
+static PyObject *
+vserver_mount(PyObject *self, PyObject *args)
+{
+ const char *guest, *target, *source, *type, *data = NULL;
+ unsigned long flags = 0;
+ struct secure_dirs dirs;
+
+ if (!PyArg_ParseTuple(args, "ssss|ks", &source, &guest, &target, &type,
+ &flags, &data))
+ return NULL;
+
+ if (secure_chdir(&dirs, guest, target) == -1)
+ goto out;
+ if (mount(source, ".", type, flags, data) == -1)
+ goto out;
+ restore_dirs(&dirs);
+
+ return NONE;
+
+out:
+ restore_dirs(&dirs);
+ return PyErr_SetFromErrno(PyExc_OSError);
+}
+
+static PyObject *
+vserver_umount(PyObject *self, PyObject *args)
+{
+ const char *guest, *target;
+ int flags = 0;
+ char *path;
+ PyObject *ret;
+
+ if (!PyArg_ParseTuple(args, "ss|i", &guest, &target, &flags))
+ return NULL;
+
+ path = calloc(strlen(guest) + strlen(target) + 2, sizeof(char));
+ sprintf(path, "%s/%s", guest, target);
+ if (umount2(path, flags) == -1)
+ ret = PyErr_SetFromErrno(PyExc_OSError);
+ else
+ ret = NONE;
+ free(path);
+
+ return ret;
+}
+
+static PyObject *
+vserver_set_runlevel(PyObject *self, PyObject *args)
+{
+ const char *file;
+ int runlevel;
+ struct utmp ut;
+
+ if (!PyArg_ParseTuple(args, "si", &file, &runlevel))
+ return NULL;
+
+ utmpname(file);
+ setutent();
+ memset(&ut, 0, sizeof(ut));
+ ut.ut_type = RUN_LVL;
+ ut.ut_pid = ('#' << 8) + runlevel + '0';
+ pututline(&ut);
+ endutent();
+
+ return NONE;
+}
+
static PyMethodDef methods[] = {
{ "chcontext", vserver_chcontext, METH_VARARGS,
"chcontext to vserver with provided flags" },
"Assign an IP address to a context" },
{ "netremove", vserver_net_remove, METH_VARARGS,
"Remove IP address(es) from a context" },
+ { "mount", vserver_mount, METH_VARARGS,
+ "Perform the mount() system call" },
+ { "umount", vserver_umount, METH_VARARGS,
+ "Perform the umount2() system call" },
+ { "setrunlevel", vserver_set_runlevel, METH_VARARGS,
+ "Set the runlevel in utmp" },
{ NULL, NULL, 0, NULL }
};