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/*
* lookup the user/group names associated with the uid/gid
* Use hashes to speed things up
*/
#include <glib.h>
#include "config.h"
#include <pwd.h>
#include <grp.h>
#include <stdio.h>
/* lookup the uid belonging to username
* if the uid is not found, return uid_given
* otherwise return the uid belonging to the username
* ON THIS SYSTEM
*/
uid_t
lookup_uid(GHashTable *u, gchar *user, uid_t uid_given)
{
uid_t uid, *uid_tmp;
struct passwd *p;
if (uid_given == 0)
return 0;
uid_tmp = (uid_t*)g_hash_table_lookup(u, user);
if (uid_tmp)
return *uid_tmp;
p = getpwnam(user);
if (!p) /* user does not exist on this system */
return uid_given;
uid = p->pw_uid;
uid_tmp = g_malloc(sizeof(uid_t));
*uid_tmp = uid;
g_hash_table_insert(u, g_strdup(user), (gpointer)uid_tmp);
uid_tmp = (uid_t *)g_hash_table_lookup(u, user);
return *uid_tmp;
}
/* see lookup_uid, but now for groups */
gid_t
lookup_gid(GHashTable *g, gchar *group, gid_t gid_given)
{
gid_t gid, *gid_tmp;
struct group *p;
if (gid_given == 0)
return 0;
gid_tmp = (gid_t*)g_hash_table_lookup(g, group);
if (gid_tmp)
return *gid_tmp;
p = getgrnam(group);
if (!p) /* grp does not exist on this system */
return gid_given;
gid = p->gr_gid;
gid_tmp = g_malloc(sizeof(gid_t));
*gid_tmp = gid;
g_hash_table_insert(g, g_strdup(group), (gpointer)gid_tmp);
gid_tmp = (gid_t *)g_hash_table_lookup(g, group);
return *gid_tmp;
}
gchar *
lookup_user(GHashTable *u, uid_t uid)
{
gchar *n;
struct passwd *p;
n = (gchar *)g_hash_table_lookup(u, (gpointer)&uid);
if (n)
return n;
/* if nothing found also add to hash? */
p = getpwuid(uid);
if (!p) /* user only has ID */
return NULL;
/* don't return the string as it might be overwritten in
* subsequent calls to getpwnam. Use the pointer stored
* in the hash. This is also the case for getgrgid()
*/
n = g_strdup(p->pw_name);
uid_t* uid_tmp = g_malloc(sizeof(uid_t));
*uid_tmp = uid;
g_hash_table_insert(u, (gpointer)uid_tmp, n);
return (gchar *)g_hash_table_lookup(u, (gpointer)&uid);
}
gchar *
lookup_group(GHashTable *g, gid_t gid)
{
gchar *n;
struct group *p;
n = (gchar *)g_hash_table_lookup(g, (gpointer)&gid);
if (n)
return n;
p = getgrgid(gid);
if (!p) /* group only has ID */
return NULL;
n = g_strdup(p->gr_name);
gid_t* gid_tmp = g_malloc(sizeof(gid_t));
*gid_tmp = gid;
g_hash_table_insert(g, (gpointer)gid_tmp, n);
return (gchar *)g_hash_table_lookup(g, (gpointer)&gid);
}
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