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New option chdir (cd)

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This commit is contained in:
Gerhard Rieger 2023-10-02 07:56:51 +02:00
parent e5cbf2feeb
commit 6125ed4e4e
11 changed files with 301 additions and 62 deletions

60
xio-namespaces.c
View file

@ -44,29 +44,61 @@ int xio_set_namespace(
return 0;
}
int xio_apply_namespace(
struct opt *opts)
{
int old_netfd;
char *netns_name;
char old_nspath[PATH_MAX];
int rc;
if (retropt_string(opts, OPT_SET_NETNS, &netns_name) < 0)
return 0;
/* Get path describing current namespace */
snprintf(old_nspath, sizeof(old_nspath)-1, "/proc/"F_pid"/ns/net",
Getpid());
/* Get a file descriptor to current ns for later reset */
old_netfd = Open(old_nspath, O_RDONLY|O_CLOEXEC, 000);
if (old_netfd < 0) {
Error2("open(%s, O_RDONLY|O_CLOEXEC): %s",
old_nspath, strerror(errno));
free(netns_name);
return -1;
}
if (old_netfd == 0) {
/* 0 means not netns option, oops */
Error1("%s(): INTERNAL", __func__);
free(netns_name);
Close(old_netfd);
return -1;
}
rc = xio_set_namespace("netns", netns_name);
free(netns_name);
if (rc < 0) {
Close(old_netfd);
return -1;
}
return old_netfd;
}
/* Sets the given namespace to that of process 1, this is assumed to be the
systems default.
Returns 0 on success, or -1 on error. */
int xio_reset_namespace(
const char *nstype)
int saved_netfd)
{
char nspath[PATH_MAX];
int nsfd;
int rc;
snprintf(nspath, sizeof(nspath)-1, "/proc/1/ns/%s", nstype);
Info("switching back to default namespace");
nsfd = Open(nspath, O_RDONLY|O_CLOEXEC, 000);
if (nsfd < 0) {
Error2("open(%s, O_RDONLY|O_CLOEXEC): %s", nspath, strerror(errno));
return -1;
}
rc = Setns(nsfd, CLONE_NEWNET);
rc = Setns(saved_netfd, CLONE_NEWNET);
if (rc < 0) {
Error2("setns(%d, CLONE_NEWNET): %s", nsfd, strerror(errno));
Close(nsfd);
Error2("xio_reset_namespace(%d): %s", saved_netfd, strerror(errno));
Close(saved_netfd);
return STAT_NORETRY;
}
Close(nsfd);
Close(saved_netfd);
return 0;
}