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/* $Id: context.c,v 1.3 1991/08/26 17:42:02 chip Exp $
*
* User context manager.
* This module exists for efficiency reasons; I could just call getpwnam()
* every time I need context info.
*
* $Log: context.c,v $
* Revision 1.3 1991/08/26 17:42:02 chip
* Don't declare unused pw/gr functions.
*
* Revision 1.2 1991/06/04 18:16:28 chip
* Feature-based configuration.
*
* Revision 1.1 91/05/13 18:36:55 chip
* Initial revision
*
*/
#include "deliver.h"
#include <pwd.h>
#include <grp.h>
extern struct passwd *getpwnam();
extern struct passwd *getpwuid();
extern void setgrent();
extern struct group *getgrent();
extern struct group *getgrnam();
extern struct group *getgrgid();
/*
* Local functions.
*/
static CONTEXT *new_context();
/*
* Local data.
*/
static CONTEXT *ctlist; /* Chain of CONTEXT structures. */
/*----------------------------------------------------------------------
* Look up a context by user name.
*/
CONTEXT *
name_context(name)
char *name;
{
struct passwd *pw;
CONTEXT *ct;
for (ct = ctlist; ct; ct = ct->ct_next)
{
if (strcmp(ct->ct_name, name) == 0)
return ct;
}
if ((pw = getpwnam(name)) == NULL)
return NULL;
return new_context(pw);
}
/*----------------------------------------------------------------------
* Look up a context by user ID.
*/
CONTEXT *
uid_context(uid)
int uid;
{
struct passwd *pw;
CONTEXT *ct;
for (ct = ctlist; ct; ct = ct->ct_next)
{
if (ct->ct_uid == uid)
return ct;
}
if ((pw = getpwuid(uid)) == NULL)
return NULL;
return new_context(pw);
}
/*----------------------------------------------------------------------
* Local function -- create a new context structure and return
* its address.
*/
static CONTEXT *
new_context(pw)
struct passwd *pw;
{
CONTEXT *ct;
#ifdef GROUP_VECTOR
struct group *gr;
#endif
ct = talloc(CONTEXT, 1);
ct->ct_uid = pw->pw_uid;
ct->ct_gid = pw->pw_gid;
ct->ct_name = copystr(pw->pw_name);
ct->ct_home = copystr(pw->pw_dir);
#ifdef GROUP_VECTOR
ct->ct_numgroups = 0;
ct->ct_groups = (maxgroups > 0)
? talloc(GRVEC_T, maxgroups)
: (GRVEC_T *) NULL;
setgrent();
while ((gr = getgrent()) != NULL)
{
int i;
for (i = 0; gr->gr_mem[i]; ++i)
{
if (strcmp(ct->ct_name, gr->gr_mem[i]) == 0
&& ct->ct_numgroups < maxgroups)
{
ct->ct_groups[ct->ct_numgroups++] = gr->gr_gid;
break;
}
}
}
#endif /* GROUP_VECTOR */
ct->ct_next = ctlist;
ctlist = ct;
return ct;
}
/*----------------------------------------------------------------------
* Report whether is is possible or not to go from the given
* effective uid/real uid/real gid to the given context.
*/
int
ok_context(euid, ruid, rgid, ct)
int euid, ruid, rgid;
CONTEXT *ct;
{
if (!ct)
return FALSE;
if (euid == 0
|| ((ruid == ct->ct_uid) && (rgid == ct->ct_gid)))
return TRUE;
else
return FALSE;
}
/*----------------------------------------------------------------------
* Look up a group name by ID.
*/
char *
group_name(id)
int id;
{
struct group *grp;
if ((grp = getgrgid(id)) == NULL)
return NULL;
return grp->gr_name;
}
/*----------------------------------------------------------------------
* Look up a group ID by name.
*/
int
group_id(name)
char *name;
{
struct group *grp;
if ((grp = getgrnam(name)) == NULL)
return -1;
return grp->gr_gid;
}
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