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liblxc: Add username and uid lookup/check.

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Add the ability to lookup usernames and check uids. Bails out early if the given
uid/name does not exist and avoids using atoi() (which is bad because we can't
tell if it parsed an int or a pumpkin).

Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
Matt Helsley 2009-03-08 17:09:27 +01:00 committed by Daniel Lezcano
parent 3cf586a20a
commit b7f85ccbb4
1 changed files with 30 additions and 2 deletions
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32
src/lxc/lxc_unshare.c
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@ -30,6 +30,7 @@
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <pwd.h>
#include "lxc_namespace.h"
@ -48,12 +49,37 @@ void usage(char *cmd)
_exit(1);
}
static uid_t lookup_user(const char *optarg)
{
char name[sysconf(_SC_LOGIN_NAME_MAX)];
uid_t uid = -1;
if (!optarg || (optarg[0] == '\0'))
return uid;
if (sscanf(optarg, "%u", &uid) < 1) {
struct passwd pwent; /* not a uid -- perhaps a username */
struct passwd *pent;
if (sscanf(optarg, "%s", name) < 1)
return uid;
if (getpwnam_r(name, &pwent, NULL, 0, &pent) || !pent)
return uid;
uid = pent->pw_uid;
} else {
if (getpwuid_r(uid, NULL, NULL, 0, NULL)) {
uid = -1;
return uid;
}
}
return uid;
}
int main(int argc, char *argv[])
{
int opt, nbargs = 0, status = 1, hastofork = 0;
char **args;
long flags = 0;
uid_t uid = 0;
uid_t uid = -1; /* valid only if (flags & CLONE_NEWUSER) */
pid_t pid;
while ((opt = getopt(argc, argv, "fmphiu:n")) != -1) {
@ -71,8 +97,10 @@ int main(int argc, char *argv[])
flags |= CLONE_NEWIPC;
break;
case 'u':
uid = lookup_user(optarg);
if (uid == -1)
break;
flags |= CLONE_NEWUSER;
uid = atoi(optarg);
break;
case 'n':
flags |= CLONE_NEWNET;