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#include <u.h>
#include <libc.h>
#include "dat.h"
#include "fns.h"
#include <bio.h>
enum {
NHASH = 251,
};
typedef struct Ident Ident;
struct Ident
{
Ident *nextid;
Ident *nextname;
int id;
char name[];
};
struct Idmap
{
Ident *tab[NHASH];
};
static Ident**
nametab(Idmap *map, char *name)
{
return &map->tab[(uint)namehash(name) % NHASH];
}
static Ident**
idtab(Idmap *map, int id)
{
return &map->tab[(uint)id % NHASH];
}
static int
name2id(Idmap *map, char *name)
{
Ident *e;
for(e = *nametab(map, name); e != nil; e = e->nextid){
if(strcmp(e->name, name) == 0)
return e->id;
}
return -1;
}
static char*
id2name(Idmap *map, int id)
{
Ident *e;
for(e = *idtab(map, id); e != nil; e = e->nextname){
if(e->id == id)
return e->name;
}
return nil;
}
static void
idmap(Idmap *map, char *name, int id)
{
Ident *e, **h;
int n;
n = strlen(name)+1;
e = malloc(sizeof(Ident)+n);
if(e == nil)
return;
e->id = id;
h = idtab(map, e->id);
e->nextid = *h;
*h = e;
memmove(e->name, name, n);
h = nametab(map, e->name);
e->nextname = *h;
*h = e;
}
static Idmap*
readidmap(char *file, int style)
{
Biobuf *b;
Idmap *m;
char *l, *name;
int id;
if((b = Bopen(file, OREAD)) == nil)
return nil;
if((m = mallocz(sizeof(*m), 1)) == nil)
goto Out;
while((l = Brdline(b, '\n')) != nil){
l[Blinelen(b)-1] = 0;
switch(style){
case '9':
id = 9000000 + strtol(l, &l, 10);
if(*l != ':')
continue;
name = ++l;
l = strchr(l, ':');
if(l == 0)
continue;
*l = 0;
break;
default:
name = l;
l = strchr(l, ':');
if(l == 0)
continue;
*l++ = 0;
/* skip password */
l = strchr(l, ':');
if(l == 0)
continue;
id = strtol(l+1, 0, 10);
break;
}
idmap(m, name, id);
}
Out:
Bterm(b);
return m;
}
void
unixidmap(Share *share)
{
static Idmap emptymap;
char *file;
if(share->stype != STYPE_DISKTREE)
goto Out;
file = smprint("%s/etc/passwd", share->root);
share->users = readidmap(file, 'u');
free(file);
file = smprint("%s/etc/group", share->root);
share->groups = readidmap(file, 'u');
free(file);
if(share->users != nil && share->groups != nil)
return;
file = smprint("%s/adm/users", share->root);
share->users = share->groups = readidmap(file, '9');
free(file);
if(share->users != nil && share->groups != nil)
return;
Out:
share->users = share->groups = &emptymap;
}
char*
unixname(Share *share, int id, int group)
{
return id2name(group? share->groups: share->users, id);
}
int
unixuid(Share *share, char *name)
{
return name2id(share->users, name);
}
int
unixgid(Share *share, char *name)
{
return name2id(share->groups, name);
}
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