ref: 2c9e3861a54e22498fb2e3226defe4393b20b202
dir: /sys/src/cmd/9nfs/unixnames.c/
#include "all.h"
static void uxfree(Unixid*);
static Unixid * xfree;
Unixidmap *idhead, *idtail;
Unixscmap *scmap;
#define UNUSED 0x7FFFFFFF
/*
* Sadly we have to use the IP address, since some systems (FreeBSD in particular)
* do not believe it to be safe to depend on the hostname and so refuse to send it.
* I dislike making this IP-centric, but so be it.
* We keep a cache of host names in getdom.
*/
Unixidmap *
pair2idmap(char *server, ulong clientip)
{
Resub match;
Unixscmap *m, *mp;
Unixidmap *r;
char dom[256];
for(mp=0,m=scmap; m; mp=m,m=m->next){
if(m->server[0] != server[0])
continue;
if(strcmp(m->server, server))
continue;
if(m->clientip != clientip)
continue;
if(mp){
mp->next = m->next;
m->next = scmap;
scmap = m;
}
r = m->map;
if(r->u.timestamp != 0 && r->g.timestamp != 0)
return r;
scmap = m->next;
free(m);
break;
}
if(rpcdebug)
fprint(2, "looking for %lux\n", clientip);
if(getdom(clientip, dom, sizeof dom)<0){
clog("auth: unknown ip address");
return nil;
}
if(rpcdebug)
fprint(2, "dom is %s\n", dom);
for(r=idhead; r; r=r->next){
if(r->u.timestamp == 0 || r->g.timestamp == 0)
continue;
match.sp = match.ep = 0;
if(regexec(r->sexp, server, &match, 1) == 0)
continue;
if(match.sp != server || match.ep <= match.sp || *match.ep)
continue;
match.sp = match.ep = 0;
if(regexec(r->cexp, dom, &match, 1) == 0)
continue;
if(match.sp != dom || match.ep <= match.sp || *match.ep)
continue;
m = malloc(sizeof(Unixscmap));
m->next = scmap;
scmap = m;
m->server = strstore(server);
m->clientip = clientip;
m->map = r;
break;
}
return r;
}
int
readunixidmaps(char *file)
{
Waitmsg *w;
Biobuf *in;
Unixidmap *m;
int i, arc; char *arv[16], buf[256];
char *l;
// long savalarm;
// savalarm = alarm(0);
in = Bopen(file, OREAD);
if(in == 0){
clog("readunixidmaps can't open %s: %r\n", file);
// alarm(savalarm);
return -1;
}
for(m=idhead; m; m=m->next)
m->flag = 0;
while(l = Brdline(in, '\n')){ /* assign = */
l[Blinelen(in)-1] = 0;
arc = strparse(l, nelem(arv), arv);
if(arc > 0 && arv[0][0] == '!'){
++arv[0];
snprint(buf, sizeof buf, "/bin/%s", arv[0]);
if(chatty){
chat("!");
for(i=0; i<arc; i++)
chat(" %s", arv[i]);
chat("...");
}
w = system(buf, arv);
if(w == nil)
chat("err: %r\n");
else if(w->msg && w->msg[0])
chat("status: %s\n", w->msg);
else
chat("OK\n");
free(w);
continue;
}
if(arc != 4)
continue;
for(m=idhead; m; m=m->next)
if(strcmp(arv[0], m->server) == 0 &&
strcmp(arv[1], m->client) == 0)
break;
if(m == 0){
m = malloc(sizeof(Unixidmap));
if(idtail)
idtail->next = m;
else
idhead = m;
idtail = m;
m->next = 0;
m->server = strstore(arv[0]);
m->client = strstore(arv[1]);
m->sexp = regcomp(m->server);
m->cexp = regcomp(m->client);
m->u.file = strstore(arv[2]);
m->u.style = 'u';
m->u.timestamp = 0;
m->u.ids = 0;
m->g.file = strstore(arv[3]);
m->g.style = 'u';
m->g.timestamp = 0;
m->g.ids = 0;
}else{
if(!m->u.file || strcmp(m->u.file, arv[2]) != 0){
m->u.file = strstore(arv[2]);
m->u.timestamp = 0;
}
if(!m->g.file || strcmp(m->g.file, arv[3]) != 0){
m->g.file = strstore(arv[3]);
m->g.timestamp = 0;
}
}
m->flag = 1;
checkunixmap(&m->u);
checkunixmap(&m->g);
}
Bterm(in);
for(m=idhead; m; m=m->next)
if(m->flag == 0){
m->u.file = 0;
m->u.timestamp = 0;
uxfree(m->u.ids);
m->u.ids = 0;
m->g.file = 0;
m->g.timestamp = 0;
uxfree(m->g.ids);
m->g.ids = 0;
}
// alarm(savalarm);
return 0;
}
static void
uxfree(Unixid *x)
{
Unixid *tail;
int count=0;
if(x){
tail = x;
if(tail->id < 0)
abort();
tail->id = UNUSED;
while(tail->next){
tail = tail->next;
++count;
if(tail->id == UNUSED)
abort();
tail->id = UNUSED;
}
tail->next = xfree;
xfree = x;
}
}
int
checkunixmap(Unixmap *u)
{
Dir *dir;
dir = dirstat(u->file);
if(dir == nil){
clog("checkunixmap can't stat %s: %r\n", u->file);
return -1;
}
if(u->timestamp > dir->mtime){
free(dir);
return 0;
}
uxfree(u->ids);
u->ids = readunixids(u->file, u->style);
u->timestamp = time(0);
free(dir);
return 1;
}
int
name2id(Unixid **list, char *name)
{
Unixid *x, *xp;
for(xp=0,x=*list; x; xp=x,x=x->next){
if(x->name[0] == name[0] && strcmp(x->name, name) == 0){
if(xp){
xp->next = x->next;
x->next = *list;
*list = x;
}
return x->id;
}
}
return -1;
}
char *
id2name(Unixid **list, int id)
{
Unixid *x, *xp;
for(xp=0,x=*list; x; xp=x,x=x->next){
if(x->id == id){
if(xp){
xp->next = x->next;
x->next = *list;
*list = x;
}
return x->name;
}
}
return "none";
}
void
idprint(int fd, Unixid *xp)
{
while(xp){
fprint(fd, "%d\t%s\n", xp->id, xp->name);
xp = xp->next;
}
}
/*
* style '9': 3:tom:tom:
* style 'u': sysadm:*:0:0:System-Administrator:/usr/admin:/bin/sh
*/
Unixid *
readunixids(char *file, int style)
{
Biobuf *in;
char *l, *name = 0;
Unixid *x, *xp = 0;
int id = 0;
in = Bopen(file, OREAD);
if(in == 0){
clog("readunixids can't open %s: %r\n", file);
return 0;
}
while(l = Brdline(in, '\n')){ /* assign = */
l[Blinelen(in)-1] = 0;
switch(style){
case '9':
id = strtol(l, &l, 10);
if(*l != ':')
continue;
name = ++l;
l = strchr(l, ':');
if(l == 0)
continue;
*l = 0;
break;
case 'u':
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;
default:
panic("unknown unixid style %d\n", style);
}
if(id == UNUSED)
id = -1; /* any value will do */
if(!(x = xfree)) /* assign = */
x = listalloc(1024/sizeof(Unixid), sizeof(Unixid));
xfree = x->next;
x->id = id;
x->name = strstore(name);
x->next = xp;
xp = x;
}
Bterm(in);
return xp;
}