ref: 853823f435cd30ffb52d90cd49b4cfdba42121d4
dir: /sys/src/cmd/disk/kfs/uid.c/
#include "all.h"
struct
{
RWLock uidlock;
char* uidbuf;
int flen;
int find;
} uidgc;
int
byuid(void *a1, void *a2)
{
Uid *u1, *u2;
u1 = a1;
u2 = a2;
return u2->uid - u1->uid;
}
int
byname(void *a1, void *a2)
{
Uid *u1, *u2;
u1 = a1;
u2 = a2;
return strcmp(uidspace+u2->offset, uidspace+u1->offset);
}
int
fchar(void)
{
if(uidgc.find >= uidgc.flen) {
uidgc.find = 0;
uidgc.flen = con_read(FID2, uidgc.uidbuf, cons.offset, MAXDAT);
if(uidgc.flen <= 0)
return 0;
cons.offset += uidgc.flen;
}
return uidgc.uidbuf[uidgc.find++];
}
int
fname(char *name)
{
int i, c;
memset(name, 0, NAMELEN);
for(i=0;; i++) {
c = fchar();
switch(c) {
case ':':
case '\n':
case ',':
case ' ':
case '#':
case 0:
return c;
}
if(i < NAMELEN-1)
name[i] = c;
}
}
#ifdef sometime
/*
* file format is
* uid:name:lead:member,member,...\n
*/
void
read_user(void)
{
int c;
if((c=fname(ustr))!=':' || (c=fname(name))!=':' || (c=fname(lead))!=':')
goto skipline;
n = atol(ustr);
if(n == 0)
goto skipline;
if(readu){
o -= strlen(name)+1;
if(o < 0) {
cprint("conf.uidspace(%ld) too small\n", conf.uidspace);
return -1;
}
strcpy(uidspace+o, name);
uid[u].uid = n;
uid[u].offset = o;
u++;
if(u >= conf.nuid) {
cprint("conf.nuid(%ld) too small\n", conf.nuid);
goto initu;
}
}else{
o = strtouid1(name);
if(o == 0 && strcmp(name, "") != 0)
o = n;
for(c=0; c<u; c++)
if(uid[c].uid == n) {
uid[c].lead = o;
break;
}
while(((c=fname(name))==',' || c=='\n') && name[0]){
work here
if(c=='\n')
break;
}
}
skipline:
while(c != '\n')
fname(ustr);
}
#endif
/*
-1:adm:adm:
0:none:adm:
1:tor:tor:
10000:sys::
10001:map:map:
10002:doc::
10003:upas:upas:
10004:font::
10005:bootes:bootes:
*/
struct {
int uid;
char *name;
int leader;
}
admusers[] = {
-1, "adm", -1,
0, "none", -1,
1, "tor", 1,
2, "glenda", 2,
10000, "sys", 0,
10001, "upas", 10001,
10002, "bootes", 10002,
0, 0, 0,
};
void
cmd_user(void)
{
int c, n, o, u, g, i;
char name[NAMELEN];
if(con_clone(FID1, FID2))
goto ainitu;
if(con_path(FID2, "/adm/users"))
goto ainitu;
if(con_open(FID2, 0)){
goto ainitu;
}
wlock(&uidgc.uidlock);
uidgc.uidbuf = malloc(MAXDAT);
memset(uid, 0, conf.nuid * sizeof(*uid));
memset(uidspace, 0, conf.uidspace * sizeof(*uidspace));
memset(gidspace, 0, conf.gidspace * sizeof(*gidspace));
uidgc.flen = 0;
uidgc.find = 0;
cons.offset = 0;
u = 0;
o = conf.uidspace;
ul1:
c = fname(name);
if(c != ':')
goto uskip;
n = atol(name);
if(n == 0)
goto uskip;
c = fname(name);
if(c != ':')
goto uskip;
o -= strlen(name)+1;
if(o < 0) {
cprint("conf.uidspace(%ld) too small\n", conf.uidspace);
goto initu;
}
strcpy(uidspace+o, name);
uid[u].uid = n;
uid[u].offset = o;
u++;
if(u >= conf.nuid) {
cprint("conf.nuid(%ld) too small\n", conf.nuid);
goto initu;
}
uskip:
if(c == '\n')
goto ul1;
if(c) {
c = fname(name);
goto uskip;
}
/* cprint("%d uids read\n", u);/**/
qsort(uid, u, sizeof(uid[0]), byuid);
for(c=u-1; c>0; c--)
if(uid[c].uid == uid[c-1].uid) {
cprint("duplicate uids: %d\n", uid[c].uid);
cprint(" %s", uidspace+uid[c].offset);
cprint(" %s\n", uidspace+uid[c-1].offset);
}
qsort(uid, u, sizeof(uid[0]), byname);
for(c=u-1; c>0; c--)
if(!strcmp(uidspace+uid[c].offset,
uidspace+uid[c-1].offset)) {
cprint("kfs: duplicate names: %s\n", uidspace+uid[c].offset);
cprint(" %d", uid[c].uid);
cprint(" %d\n", uid[c-1].uid);
}
if(cons.flags & Fuid)
for(c=0; c<u; c++)
cprint("%6d %s\n", uid[c].uid, uidspace+uid[c].offset);
uidgc.flen = 0;
uidgc.find = 0;
cons.offset = 0;
g = 0;
gl1:
c = fname(name);
if(c != ':')
goto gskip;
n = atol(name); /* number */
if(n == 0)
goto gskip;
c = fname(name); /* name */
if(c != ':')
goto gskip;
c = fname(name); /* leader */
if(c != ':')
goto gskip;
o = strtouid1(name);
if(o == 0 && strcmp(name, "") != 0)
o = n;
for(c=0; c<u; c++)
if(uid[c].uid == n) {
uid[c].lead = o;
break;
}
c = fname(name); /* list of members */
if(c != ',' && c != '\n')
goto gskip;
if(!name[0])
goto gskip;
gidspace[g++] = n;
gl2:
n = strtouid1(name);
if(n)
gidspace[g++] = n;
if(g >= conf.gidspace-2) {
cprint("conf.gidspace(%ld) too small\n", conf.gidspace);
goto initu;
}
if(c == '\n')
goto gl3;
c = fname(name);
if(c == ',' || c == '\n')
goto gl2;
cprint("gid truncated\n");
gl3:
gidspace[g++] = 0;
gskip:
if(c == '\n')
goto gl1;
if(c) {
c = fname(name);
goto gskip;
}
if(cons.flags & Fuid) {
o = 0;
for(c=0; c<g; c++) {
n = gidspace[c];
if(n == 0) {
o = 0;
continue;
}
uidtostr1(name, n);
if(o) {
if(o > 6) {
cprint("\n %s", name);
o = 1;
} else
cprint(" %s", name);
} else
cprint("\n%6s", name);
o++;
}
cprint("\n");
}
goto out;
ainitu:
wlock(&uidgc.uidlock);
uidgc.uidbuf = malloc(MAXDAT);
initu:
cprint("initializing minimal user table\n");
memset(uid, 0, conf.nuid * sizeof(*uid));
memset(uidspace, 0, conf.uidspace * sizeof(*uidspace));
memset(gidspace, 0, conf.gidspace * sizeof(*gidspace));
o = conf.uidspace;
u = 0;
for(i=0; admusers[i].name; i++){
o -= strlen(admusers[i].name)+1;
strcpy(uidspace+o, admusers[i].name);
uid[u].uid = admusers[i].uid;
uid[u].lead = admusers[i].leader;
uid[u].offset = o;
u++;
}
out:
free(uidgc.uidbuf);
writegroup = strtouid1("write");
wunlock(&uidgc.uidlock);
}
void
uidtostr(char *name, int id)
{
rlock(&uidgc.uidlock);
uidtostr1(name, id);
runlock(&uidgc.uidlock);
}
void
uidtostr1(char *name, int id)
{
Uid *u;
int i;
if(id == 0){
strncpy(name, "none", NAMELEN);
return;
}
for(i=0, u=uid; i<conf.nuid; i++,u++) {
if(u->uid == id) {
strncpy(name, uidspace+u->offset, NAMELEN);
return;
}
}
strncpy(name, "none", NAMELEN);
}
int
strtouid(char *s)
{
int i;
rlock(&uidgc.uidlock);
i = strtouid1(s);
runlock(&uidgc.uidlock);
return i;
}
int
strtouid1(char *s)
{
Uid *u;
int i;
for(i=0, u=uid; i<conf.nuid; i++,u++)
if(!strcmp(s, uidspace+u->offset))
return u->uid;
return 0;
}
int
ingroup(int u, int g)
{
short *p;
if(u == g)
return 1;
rlock(&uidgc.uidlock);
for(p=gidspace; *p;) {
if(*p != g) {
for(p++; *p++;)
;
continue;
}
for(p++; *p; p++)
if(*p == u) {
runlock(&uidgc.uidlock);
return 1;
}
}
runlock(&uidgc.uidlock);
return 0;
}
int
leadgroup(int ui, int gi)
{
Uid *u;
int i;
rlock(&uidgc.uidlock);
for(i=0, u=uid; i<conf.nuid; i++,u++) {
if(u->uid == gi) {
i = u->lead;
runlock(&uidgc.uidlock);
if(i == ui)
return 1;
if(i == 0)
return ingroup(ui, gi);
return 0;
}
}
runlock(&uidgc.uidlock);
return 0;
}