ref: 5c1feb0ef0b795e5de71e956f9ccddcd5c4b7f21
dir: /sys/src/cmd/cwfs/uidgid.c/
#include "all.h"
struct {
char* name;
Userid uid;
Userid lead;
} minusers[] = {
"adm", -1, -1,
"none", 0, -1,
"tor", 1, 1,
"sys", 10000, 0,
"map", 10001, 10001,
"doc", 10002, 0,
"upas", 10003, 10003,
"font", 10004, 0,
"bootes", 10005, 10005,
0
};
static char buf[4096];
static Rune ichar[] = L"?=+-/:";
Uid* chkuid(char *name, int chk);
void do_newuser(int, char*[]);
char* getword(char*, Rune, char*, int);
void pentry(char*, Uid*);
int readln(char*, int);
void setminusers(void);
Uid* uidtop(int);
void
cmd_users(int argc, char *argv[])
{
Uid *ui;
int u, g, o, line;
char *file, *p, *uname, *ulead, *unext;
file = "/adm/users";
if(argc > 1)
file = argv[1];
if(strcmp(file, "default") == 0) {
setminusers();
return;
}
uidgc.uidbuf = getbuf(devnone, Cuidbuf, 0);
if(walkto(file) || con_open(FID2, 0)) {
print("cmd_users: cannot access %s\n", file);
putbuf(uidgc.uidbuf);
return;
}
uidgc.flen = 0;
uidgc.find = 0;
cons.offset = 0;
cons.nuid = 0;
u = 0;
line = 0;
while(readln(buf, sizeof buf) != 0) {
line++;
p = getword(buf, L':', "no : after number", line);
if(p == nil)
continue;
ulead = getword(p, L':', "no : after name", line);
if(ulead == nil)
continue;
if(strlen(p) > NAMELEN-1) {
print("%s: name too long\n", p);
continue;
}
strcpy(uid[u].name, p);
uid[u].uid = number(buf, 0, 10);
uid[u].lead = 0;
uid[u].ngrp = 0;
u++;
if(u >= conf.nuid) {
print("conf.nuid too small (%ld)\n", conf.nuid);
break;
}
}
/* Sorted by uid for use in uidtostr */
wlock(&uidgc.uidlock);
qsort(uid, u, sizeof(uid[0]), byuid);
cons.nuid = u;
wunlock(&uidgc.uidlock);
/* Parse group table */
uidgc.flen = 0;
uidgc.find = 0;
cons.offset = 0;
cons.ngid = 0;
g = 0;
line = 0;
while(readln(buf, sizeof buf) != 0) {
line++;
uname = getword(buf, L':', 0, 0); /* skip number */
if(uname == nil)
continue;
ulead = getword(uname, L':', 0, 0); /* skip name */
if(ulead == nil)
continue;
p = getword(ulead, L':', "no : after leader", line);
if(p == nil)
continue;
ui = uidpstr(uname);
if(ui == nil)
continue;
/* set to owner if name not known */
ui->lead = 0;
if(ulead[0]) {
o = strtouid(ulead);
if(o >= 0)
ui->lead = o;
else
ui->lead = ui->uid;
}
ui->gtab = &gidspace[g];
ui->ngrp = 0;
while (p != nil) {
unext = getword(p, L',', 0, 0);
o = strtouid(p);
if(o >= 0) {
gidspace[g++] = o;
ui->ngrp++;
}
p = unext;
}
}
cons.ngid = g;
putbuf(uidgc.uidbuf);
print("%d uids read, %d groups used\n", cons.nuid, cons.ngid);
}
void
cmd_newuser(int argc, char *argv[])
{
if(argc <= 1) {
print("usage: newuser args\n");
print("\tname -- create a new user\n");
print("\tname : -- create a new group\n");
print("\tname ? -- show entry for user\n");
print("\tname name -- rename\n");
print("\tname =[name] -- add/alter/remove leader\n");
print("\tname +name -- add member\n");
print("\tname -name -- delete member\n");
return;
}
do_newuser(argc, argv);
}
void
do_newuser(int argc, char *argv[])
{
int i, l, n, nuid;
char *p, *md, *q;
Rune *r;
Userid *s;
Uid *ui, *u2;
nuid = 10000;
md = 0;
if(argc == 2) {
nuid = 1;
argv[2] = ":";
}
for(r = ichar; *r; r++)
if(utfrune(argv[1], *r)) {
print("illegal character in name\n");
return;
}
if(strlen(argv[1]) > NAMELEN-1) {
print("name %s too long\n", argv[1]);
return;
}
p = argv[2];
switch(*p) {
case '?':
ui = chkuid(argv[1], 1);
if(ui == 0)
return;
pentry(buf, ui);
n = strlen(buf);
p = buf;
while(n > PRINTSIZE-5) {
q = p;
p += PRINTSIZE-5;
n -= PRINTSIZE-5;
i = *p;
*p = 0;
print("%s", q);
*p = i;
}
print("%s\n", p);
return;
case ':':
if(chkuid(argv[1], 0))
return;
while(uidtop(nuid) != 0)
nuid++;
if(cons.nuid >= conf.nuid) {
print("conf.nuid too small (%ld)\n", conf.nuid);
return;
}
wlock(&uidgc.uidlock);
ui = &uid[cons.nuid++];
ui->uid = nuid;
ui->lead = 0;
if(nuid < 10000) {
ui->lead = ui->uid;
md = argv[1];
}
strcpy(ui->name, argv[1]);
ui->ngrp = 0;
qsort(uid, cons.nuid, sizeof(uid[0]), byuid);
wunlock(&uidgc.uidlock);
break;
case '=':
ui = chkuid(argv[1], 1);
if(ui == 0)
return;
p++;
if(*p == '\0') {
ui->lead = 0;
break;
}
u2 = chkuid(p, 1);
if(u2 == 0)
return;
ui->lead = u2->uid;
break;
case '+':
ui = chkuid(argv[1], 1);
if(ui == 0)
return;
p++;
u2 = chkuid(p, 1);
if(u2 == 0)
return;
if(u2->uid == ui->uid)
return;
if(cons.ngid+ui->ngrp+1 >= conf.gidspace) {
print("conf.gidspace too small (%ld)\n", conf.gidspace);
return;
}
for(i = 0; i < ui->ngrp; i++) {
if(ui->gtab[i] == u2->uid) {
print("member already in group\n");
return;
}
}
wlock(&uidgc.uidlock);
s = gidspace+cons.ngid;
memmove(s, ui->gtab, ui->ngrp*sizeof(*s));
ui->gtab = s;
s[ui->ngrp++] = u2->uid;
cons.ngid += ui->ngrp+1;
wunlock(&uidgc.uidlock);
break;
case '-':
ui = chkuid(argv[1], 1);
if(ui == 0)
return;
p++;
u2 = chkuid(p, 1);
if(u2 == 0)
return;
for(i = 0; i < ui->ngrp; i++)
if(ui->gtab[i] == u2->uid)
break;
if(i == ui->ngrp) {
print("%s not in group\n", p);
return;
}
wlock(&uidgc.uidlock);
s = ui->gtab+i;
ui->ngrp--;
memmove(s, s+1, (ui->ngrp-i)*sizeof(*s));
wunlock(&uidgc.uidlock);
break;
default:
if(chkuid(argv[2], 0))
return;
for(r = ichar; *r; r++)
if(utfrune(argv[2], *r)) {
print("illegal character in name\n");
return;
}
ui = chkuid(argv[1], 1);
if(ui == 0)
return;
if(strlen(argv[2]) > NAMELEN-1) {
print("name %s too long\n", argv[2]);
return;
}
wlock(&uidgc.uidlock);
strcpy(ui->name, argv[2]);
wunlock(&uidgc.uidlock);
break;
}
if(walkto("/adm/users") || con_open(FID2, OWRITE|OTRUNC)) {
print("can't open /adm/users for write\n");
return;
}
cons.offset = 0;
for(i = 0; i < cons.nuid; i++) {
pentry(buf, &uid[i]);
l = strlen(buf);
n = con_write(FID2, buf, cons.offset, l);
if(l != n)
print("short write on /adm/users\n");
cons.offset += n;
}
if(md != 0) {
sprint(buf, "create /usr/%s %s %s 755 d", md, md, md);
print("%s\n", buf);
cmd_exec(buf);
}
}
Uid*
chkuid(char *name, int chk)
{
Uid *u;
u = uidpstr(name);
if(chk == 1) {
if(u == 0)
print("%s does not exist\n", name);
}
else {
if(u != 0)
print("%s already exists\n", name);
}
return u;
}
void
pentry(char *buf, Uid *u)
{
int i, posn;
Uid *p;
posn = sprint(buf, "%d:%s:", u->uid, u->name);
p = uidtop(u->lead);
if(p && u->lead != 0)
posn += sprint(buf+posn, "%s", p->name);
posn += sprint(buf+posn, ":");
for(i = 0; i < u->ngrp; i++) {
p = uidtop(u->gtab[i]);
if(i != 0)
posn += sprint(buf+posn, ",");
if(p != 0)
posn += sprint(buf+posn, "%s", p->name);
else
posn += sprint(buf+posn, "%d", u->gtab[i]);
}
sprint(buf+posn, "\n");
}
void
setminusers(void)
{
int u;
for(u = 0; minusers[u].name; u++) {
strcpy(uid[u].name, minusers[u].name);
uid[u].uid = minusers[u].uid;
uid[u].lead = minusers[u].lead;
}
cons.nuid = u;
qsort(uid, u, sizeof(uid[0]), byuid);
}
Uid*
uidpstr(char *name)
{
Uid *s, *e;
s = uid;
for(e = s+cons.nuid; s < e; s++) {
if(strcmp(name, s->name) == 0)
return s;
}
return 0;
}
char*
getword(char *buf, Rune delim, char *error, int line)
{
char *p;
p = utfrune(buf, delim);
if(p == 0) {
if(error)
print("cmd_users: %s line %d\n", error, line);
return 0;
}
*p = '\0';
return p+1;
}
int
strtouid(char *name)
{
Uid *u;
int id;
rlock(&uidgc.uidlock);
u = uidpstr(name);
id = -2;
if(u != 0)
id = u->uid;
runlock(&uidgc.uidlock);
return id;
}
Uid*
uidtop(int id)
{
Uid *bot, *top, *new;
bot = uid;
top = bot + cons.nuid-1;
while(bot <= top){
new = bot + (top - bot)/2;
if(new->uid == id)
return new;
if(new->uid < id)
bot = new + 1;
else
top = new - 1;
}
return 0;
}
void
uidtostr(char *name, int id, int dolock)
{
Uid *p;
if(dolock)
rlock(&uidgc.uidlock);
p = uidtop(id);
if(p == 0)
strcpy(name, "none");
else
strcpy(name, p->name);
if(dolock)
runlock(&uidgc.uidlock);
}
int
ingroup(int u, int g)
{
Uid *p;
Userid *s, *e;
if(u == g)
return 1;
rlock(&uidgc.uidlock);
p = uidtop(g);
if(p != 0) {
s = p->gtab;
for(e = s + p->ngrp; s < e; s++) {
if(*s == u) {
runlock(&uidgc.uidlock);
return 1;
}
}
}
runlock(&uidgc.uidlock);
return 0;
}
int
leadgroup(int ui, int gi)
{
int i;
Uid *u;
/* user 'none' cannot be a group leader */
if(ui == 0)
return 0;
rlock(&uidgc.uidlock);
u = uidtop(gi);
if(u == 0) {
runlock(&uidgc.uidlock);
return 0;
}
i = u->lead;
runlock(&uidgc.uidlock);
if(i == ui)
return 1;
if(i == 0)
return ingroup(ui, gi);
return 0;
}
int
byuid(void *a1, void *a2)
{
Uid *u1, *u2;
u1 = a1;
u2 = a2;
return u1->uid - u2->uid;
}
int
fchar(void)
{
int n;
n = BUFSIZE;
if(n > MAXDAT)
n = MAXDAT;
if(uidgc.find >= uidgc.flen) {
uidgc.find = 0;
uidgc.flen = con_read(FID2, uidgc.uidbuf->iobuf, cons.offset, n);
if(uidgc.flen <= 0)
return -1;
cons.offset += uidgc.flen;
}
return (uchar)uidgc.uidbuf->iobuf[uidgc.find++];
}
int
readln(char *p, int len)
{
int n, c;
n = 0;
while(len--) {
c = fchar();
if(c == -1 || c == '\n')
break;
n++;
*p++ = c;
}
*p = '\0';
return n;
}