ref: bcbb3563b4341791753a50a6dff3f6cd2aab0620
dir: /kern/devip.c/
#include "u.h"
#include "lib.h"
#include "dat.h"
#include "fns.h"
#include "error.h"
#include "ip.h"
#include "devip.h"
void csclose(Chan*);
long csread(Chan*, void*, long, vlong);
long cswrite(Chan*, void*, long, vlong);
void osipinit(void);
enum
{
Qtopdir = 1, /* top level directory */
Qtopbase,
Qcs = Qtopbase,
Qprotodir, /* directory for a protocol */
Qprotobase,
Qclone = Qprotobase,
Qconvdir, /* directory for a conversation */
Qconvbase,
Qctl = Qconvbase,
Qdata,
Qstatus,
Qremote,
Qlocal,
Qlisten,
MAXPROTO = 4
};
#define TYPE(x) ((int)((x).path & 0xf))
#define CONV(x) ((int)(((x).path >> 4)&0xfff))
#define PROTO(x) ((int)(((x).path >> 16)&0xff))
#define QID(p, c, y) (((p)<<16) | ((c)<<4) | (y))
#define ipzero(x) memset(x, 0, IPaddrlen)
typedef struct Proto Proto;
typedef struct Conv Conv;
struct Conv
{
int x;
Ref r;
int sfd;
int perm;
char owner[KNAMELEN];
char* state;
uchar laddr[IPaddrlen];
ushort lport;
uchar raddr[IPaddrlen];
ushort rport;
int restricted;
char cerr[KNAMELEN];
Proto* p;
};
struct Proto
{
Lock l;
int x;
int stype;
char name[KNAMELEN];
int nc;
int maxconv;
Conv** conv;
Qid qid;
};
static int np;
static Proto proto[MAXPROTO];
static Conv* protoclone(Proto*, char*, int);
static void setladdr(Conv*);
static char network[] = "network";
static int
ip3gen(Chan *c, int i, Dir *dp)
{
Qid q;
Conv *cv;
char *p;
cv = proto[PROTO(c->qid)].conv[CONV(c->qid)];
mkqid(&q, QID(PROTO(c->qid), CONV(c->qid), i), 0, QTFILE);
switch(i) {
default:
return -1;
case Qctl:
devdir(c, q, "ctl", 0, cv->owner, cv->perm, dp);
return 1;
case Qdata:
devdir(c, q, "data", 0, cv->owner, cv->perm, dp);
return 1;
case Qlisten:
devdir(c, q, "listen", 0, cv->owner, cv->perm, dp);
return 1;
case Qlocal:
p = "local";
break;
case Qremote:
p = "remote";
break;
case Qstatus:
p = "status";
break;
}
devdir(c, q, p, 0, cv->owner, 0444, dp);
return 1;
}
static int
ip2gen(Chan *c, int i, Dir *dp)
{
Qid q;
switch(i) {
case Qclone:
mkqid(&q, QID(PROTO(c->qid), 0, Qclone), 0, QTFILE);
devdir(c, q, "clone", 0, network, 0666, dp);
return 1;
}
return -1;
}
static int
ip1gen(Chan *c, int i, Dir *dp)
{
Qid q;
char *p;
int prot;
int len = 0;
prot = 0666;
mkqid(&q, QID(0, 0, i), 0, QTFILE);
switch(i) {
default:
return -1;
case Qcs:
p = "cs";
prot = 0664;
break;
}
devdir(c, q, p, len, network, prot, dp);
return 1;
}
static int
ipgen(Chan *c, char *nname, Dirtab *d, int nd, int s, Dir *dp)
{
Qid q;
Conv *cv;
switch(TYPE(c->qid)) {
case Qtopdir:
if(s == DEVDOTDOT){
mkqid(&q, QID(0, 0, Qtopdir), 0, QTDIR);
snprint(up->genbuf, sizeof up->genbuf, "#I%lud", c->dev);
devdir(c, q, up->genbuf, 0, network, 0555, dp);
return 1;
}
if(s < np) {
mkqid(&q, QID(s, 0, Qprotodir), 0, QTDIR);
devdir(c, q, proto[s].name, 0, network, 0555, dp);
return 1;
}
s -= np;
return ip1gen(c, s+Qtopbase, dp);
case Qcs:
return ip1gen(c, TYPE(c->qid), dp);
case Qprotodir:
if(s == DEVDOTDOT){
mkqid(&q, QID(0, 0, Qtopdir), 0, QTDIR);
snprint(up->genbuf, sizeof up->genbuf, "#I%lud", c->dev);
devdir(c, q, up->genbuf, 0, network, 0555, dp);
return 1;
}
if(s < proto[PROTO(c->qid)].nc) {
cv = proto[PROTO(c->qid)].conv[s];
snprint(up->genbuf, sizeof up->genbuf, "%d", s);
mkqid(&q, QID(PROTO(c->qid), s, Qconvdir), 0, QTDIR);
devdir(c, q, up->genbuf, 0, cv->owner, 0555, dp);
return 1;
}
s -= proto[PROTO(c->qid)].nc;
return ip2gen(c, s+Qprotobase, dp);
case Qclone:
return ip2gen(c, TYPE(c->qid), dp);
case Qconvdir:
if(s == DEVDOTDOT){
s = PROTO(c->qid);
mkqid(&q, QID(s, 0, Qprotodir), 0, QTDIR);
devdir(c, q, proto[s].name, 0, network, 0555, dp);
return 1;
}
return ip3gen(c, s+Qconvbase, dp);
case Qctl:
case Qdata:
case Qlisten:
case Qlocal:
case Qremote:
case Qstatus:
return ip3gen(c, TYPE(c->qid), dp);
}
return -1;
}
static void
newproto(char *name, int type, int maxconv)
{
int l;
Proto *p;
if(np >= MAXPROTO) {
print("no %s: increase MAXPROTO", name);
return;
}
p = &proto[np];
strcpy(p->name, name);
p->stype = type;
p->qid.path = QID(np, 0, Qprotodir);
p->qid.type = QTDIR;
p->x = np++;
p->maxconv = maxconv;
l = sizeof(Conv*)*(p->maxconv+1);
p->conv = mallocz(l, 1);
if(p->conv == 0)
panic("no memory");
}
void
ipinit(void)
{
osipinit();
newproto("udp", S_UDP, 10);
newproto("tcp", S_TCP, 30);
fmtinstall('I', eipfmt);
fmtinstall('E', eipfmt);
}
Chan *
ipattach(char *spec)
{
Chan *c;
c = devattach('I', spec);
c->qid.path = QID(0, 0, Qtopdir);
c->qid.type = QTDIR;
c->qid.vers = 0;
return c;
}
static Walkqid*
ipwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, 0, 0, ipgen);
}
int
ipstat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, 0, 0, ipgen);
}
Chan *
ipopen(Chan *c, int omode)
{
Proto *p;
uchar raddr[IPaddrlen];
ushort rport;
int perm, sfd;
Conv *cv, *lcv;
omode &= 3;
perm = 0;
switch(omode) {
case OREAD:
perm = 4;
break;
case OWRITE:
perm = 2;
break;
case ORDWR:
perm = 6;
break;
}
switch(TYPE(c->qid)) {
default:
break;
case Qtopdir:
case Qprotodir:
case Qconvdir:
case Qstatus:
case Qremote:
case Qlocal:
if(omode != OREAD)
error(Eperm);
break;
case Qclone:
p = &proto[PROTO(c->qid)];
cv = protoclone(p, up->user, -1);
if(cv == 0)
error(Enodev);
c->qid.path = QID(p->x, cv->x, Qctl);
c->qid.vers = 0;
break;
case Qdata:
case Qctl:
p = &proto[PROTO(c->qid)];
lock(&p->l);
cv = p->conv[CONV(c->qid)];
lock(&cv->r.lk);
if((perm & (cv->perm>>6)) != perm) {
if(strcmp(up->user, cv->owner) != 0 ||
(perm & cv->perm) != perm) {
unlock(&cv->r.lk);
unlock(&p->l);
error(Eperm);
}
}
cv->r.ref++;
if(cv->r.ref == 1) {
memmove(cv->owner, up->user, KNAMELEN);
cv->perm = 0660;
}
unlock(&cv->r.lk);
unlock(&p->l);
break;
case Qlisten:
p = &proto[PROTO(c->qid)];
lcv = p->conv[CONV(c->qid)];
sfd = so_accept(lcv->sfd, raddr, &rport);
cv = protoclone(p, up->user, sfd);
if(cv == 0) {
close(sfd);
error(Enodev);
}
ipmove(cv->raddr, raddr);
cv->rport = rport;
setladdr(cv);
cv->state = "Established";
c->qid.path = QID(p->x, cv->x, Qctl);
break;
}
c->mode = openmode(omode);
c->flag |= COPEN;
c->offset = 0;
return c;
}
void
ipclose(Chan *c)
{
Conv *cc;
switch(TYPE(c->qid)) {
case Qcs:
csclose(c);
break;
case Qdata:
case Qctl:
if((c->flag & COPEN) == 0)
break;
cc = proto[PROTO(c->qid)].conv[CONV(c->qid)];
if(decref(&cc->r) != 0)
break;
strcpy(cc->owner, network);
cc->perm = 0666;
cc->state = "Closed";
ipzero(cc->laddr);
ipzero(cc->raddr);
cc->lport = 0;
cc->rport = 0;
close(cc->sfd);
break;
}
}
long
ipread(Chan *ch, void *a, long n, vlong offset)
{
int r;
Conv *c;
Proto *x;
uchar ip[IPaddrlen];
char buf[128], *p;
/*print("ipread %s %lux\n", chanpath(ch), (long)ch->qid.path);*/
p = a;
switch(TYPE(ch->qid)) {
default:
error(Eperm);
case Qcs:
return csread(ch, a, n, offset);
case Qprotodir:
case Qtopdir:
case Qconvdir:
return devdirread(ch, a, n, 0, 0, ipgen);
case Qctl:
sprint(buf, "%d", CONV(ch->qid));
return readstr(offset, p, n, buf);
case Qremote:
c = proto[PROTO(ch->qid)].conv[CONV(ch->qid)];
ipmove(ip, c->raddr);
sprint(buf, "%I!%d\n", ip, c->rport);
return readstr(offset, p, n, buf);
case Qlocal:
c = proto[PROTO(ch->qid)].conv[CONV(ch->qid)];
ipmove(ip, c->laddr);
sprint(buf, "%I!%d\n", ip, c->lport);
return readstr(offset, p, n, buf);
case Qstatus:
x = &proto[PROTO(ch->qid)];
c = x->conv[CONV(ch->qid)];
sprint(buf, "%s/%d %d %s \n",
c->p->name, c->x, c->r.ref, c->state);
return readstr(offset, p, n, buf);
case Qdata:
c = proto[PROTO(ch->qid)].conv[CONV(ch->qid)];
r = so_recv(c->sfd, a, n, 0);
if(r < 0){
oserrstr();
nexterror();
}
return r;
}
}
static void
setladdr(Conv *c)
{
so_getsockname(c->sfd, c->laddr, &c->lport);
}
static void
setlport(Conv *c)
{
if(c->restricted == 0 && c->lport == 0)
return;
if(c->sfd == -1)
c->sfd = so_socket(c->p->stype, c->laddr);
so_bind(c->sfd, c->restricted, c->lport, c->laddr);
}
static void
setladdrport(Conv *c, char *str)
{
char *p;
uchar addr[IPaddrlen];
p = strchr(str, '!');
if(p == 0) {
p = str;
ipzero(c->laddr);
}
else {
*p++ = 0;
parseip(addr, str);
ipmove(c->laddr, addr);
}
if(*p == '*')
c->lport = 0;
else
c->lport = atoi(p);
setlport(c);
}
static char*
setraddrport(Conv *c, char *str)
{
char *p;
uchar addr[IPaddrlen];
p = strchr(str, '!');
if(p == 0)
return "malformed address";
*p++ = 0;
parseip(addr, str);
ipmove(c->raddr, addr);
c->rport = atoi(p);
p = strchr(p, '!');
if(p) {
if(strcmp(p, "!r") == 0)
c->restricted = 1;
}
return 0;
}
long
ipwrite(Chan *ch, void *a, long n, vlong offset)
{
Conv *c;
Proto *x;
int r, nf;
char *p, *fields[3], buf[128];
switch(TYPE(ch->qid)) {
default:
error(Eperm);
case Qcs:
return cswrite(ch, a, n, offset);
case Qctl:
x = &proto[PROTO(ch->qid)];
c = x->conv[CONV(ch->qid)];
if(n > sizeof(buf)-1)
n = sizeof(buf)-1;
memmove(buf, a, n);
buf[n] = '\0';
nf = tokenize(buf, fields, 3);
if(strcmp(fields[0], "connect") == 0){
switch(nf) {
default:
error("bad args to connect");
case 2:
p = setraddrport(c, fields[1]);
if(p != 0)
error(p);
break;
case 3:
p = setraddrport(c, fields[1]);
if(p != 0)
error(p);
c->lport = atoi(fields[2]);
setlport(c);
break;
}
if(c->sfd == -1)
c->sfd = so_socket(c->p->stype, c->raddr);
so_connect(c->sfd, c->raddr, c->rport);
setladdr(c);
c->state = "Established";
return n;
}
if(strcmp(fields[0], "announce") == 0) {
switch(nf){
default:
error("bad args to announce");
case 2:
setladdrport(c, fields[1]);
break;
}
so_listen(c->sfd);
c->state = "Announced";
return n;
}
if(strcmp(fields[0], "bind") == 0){
switch(nf){
default:
error("bad args to bind");
case 2:
c->lport = atoi(fields[1]);
break;
}
setlport(c);
return n;
}
error("bad control message");
case Qdata:
x = &proto[PROTO(ch->qid)];
c = x->conv[CONV(ch->qid)];
r = so_send(c->sfd, a, n, 0);
if(r < 0){
oserrstr();
nexterror();
}
return r;
}
return n;
}
static Conv*
protoclone(Proto *p, char *user, int nfd)
{
Conv *c, **pp, **ep;
c = 0;
lock(&p->l);
if(waserror()) {
unlock(&p->l);
nexterror();
}
ep = &p->conv[p->maxconv];
for(pp = p->conv; pp < ep; pp++) {
c = *pp;
if(c == 0) {
c = mallocz(sizeof(Conv), 1);
if(c == 0)
error(Enomem);
lock(&c->r.lk);
c->r.ref = 1;
c->p = p;
c->x = pp - p->conv;
p->nc++;
*pp = c;
break;
}
lock(&c->r.lk);
if(c->r.ref == 0) {
c->r.ref++;
break;
}
unlock(&c->r.lk);
}
if(pp >= ep) {
unlock(&p->l);
poperror();
return 0;
}
strcpy(c->owner, user);
c->perm = 0660;
c->state = "Closed";
c->restricted = 0;
ipzero(c->laddr);
ipzero(c->raddr);
c->lport = 0;
c->rport = 0;
c->sfd = nfd;
unlock(&c->r.lk);
unlock(&p->l);
poperror();
return c;
}
void
csclose(Chan *c)
{
free(c->aux);
c->aux = nil;
}
long
csread(Chan *c, void *a, long n, vlong offset)
{
char *s, *e, *p;
s = c->aux;
if(s == nil)
return 0;
e = strchr(s, 0);
s += offset;
if(s >= e)
return 0;
p = strchr(s, '\n');
if(p != nil)
p++;
else
p = e;
if(p - s < n)
n = p - s;
memmove(a, s, n);
return n;
}
static struct
{
char *name;
uint num;
} tab[] = {
"cs", 1,
"echo", 7,
"discard", 9,
"systat", 11,
"daytime", 13,
"netstat", 15,
"chargen", 19,
"ftp-data", 20,
"ftp", 21,
"ssh", 22,
"telnet", 23,
"smtp", 25,
"time", 37,
"whois", 43,
"dns", 53,
"domain", 53,
"uucp", 64,
"gopher", 70,
"rje", 77,
"finger", 79,
"http", 80,
"link", 87,
"supdup", 95,
"hostnames", 101,
"iso-tsap", 102,
"x400", 103,
"x400-snd", 104,
"csnet-ns", 105,
"pop-2", 109,
"pop3", 110,
"portmap", 111,
"uucp-path", 117,
"nntp", 119,
"netbios", 139,
"imap4", 143,
"NeWS", 144,
"print-srv", 170,
"z39.50", 210,
"fsb", 400,
"sysmon", 401,
"proxy", 402,
"proxyd", 404,
"https", 443,
"cifs", 445,
"ssmtp", 465,
"rexec", 512,
"login", 513,
"shell", 514,
"printer", 515,
"courier", 530,
"cscan", 531,
"uucp", 540,
"snntp", 563,
"9fs", 564,
"whoami", 565,
"guard", 566,
"ticket", 567,
"dlsftp", 666,
"fmclient", 729,
"imaps", 993,
"pop3s", 995,
"ingreslock", 1524,
"pptp", 1723,
"nfs", 2049,
"webster", 2627,
"weather", 3000,
"secstore", 5356,
"Xdisplay", 6000,
"styx", 6666,
"mpeg", 6667,
"rstyx", 6668,
"infdb", 6669,
"infsigner", 6671,
"infcsigner", 6672,
"inflogin", 6673,
"bandt", 7330,
"face", 32000,
"dhashgate", 11978,
"exportfs", 17007,
"rexexec", 17009,
"ncpu", 17010,
"cpu", 17013,
"rcpu", 17019,
"t9fs", 17020,
"glenglenda2", 17021,
"glenglenda3", 17022,
"glenglenda4", 17023,
"glenglenda5", 17024,
"glenglenda6", 17025,
"glenglenda7", 17026,
"glenglenda8", 17027,
"glenglenda9", 17028,
"glenglenda10", 17029,
"flyboy", 17032,
"dlsftp", 17033,
"venti", 17034,
"wiki", 17035,
"vica", 17036,
0
};
static int
lookupport(char *s)
{
int i;
char buf[10], *p;
i = strtol(s, &p, 0);
if(*s && *p == 0)
return i;
i = so_getservbyname(s, "tcp", buf);
if(i != -1)
return atoi(buf);
for(i=0; tab[i].name; i++)
if(strcmp(s, tab[i].name) == 0)
return tab[i].num;
return 0;
}
long
cswrite(Chan *c, void *a, long n, vlong offset)
{
char *f[4], *ips[8];
char *s, *ns;
uchar ip[IPaddrlen];
int i, nf, port, nips;
s = malloc(n+1);
if(s == nil)
error(Enomem);
if(waserror()){
free(s);
nexterror();
}
memmove(s, a, n);
s[n] = 0;
nf = getfields(s, f, nelem(f), 0, "!");
if(nf != 3)
error("can't translate");
port = lookupport(f[2]);
if(port <= 0)
error("no translation for port found");
if(strcmp(f[1], "*") == 0){
if(strcmp(f[0], "net") == 0)
f[0] = "tcp";
ns = smprint("/net/%s/clone %d", f[0], port);
} else {
if(parseip(ip, f[1]) != -1){
ips[0] = smprint("%I", ip);
nips = 1;
} else {
nips = so_gethostbyname(f[1], ips, nelem(ips));
if(nips <= 0)
error("no translation for host found");
}
ns = smprint("/net/%s/clone %s!%d", f[0], ips[0], port);
free(ips[0]);
for(i=1; i<nips; i++){
ips[0] = smprint("%s\n/net/%s/clone %s!%d", ns, f[0], ips[i], port);
free(ips[i]);
free(ns);
ns = ips[0];
}
}
free(c->aux);
c->aux = ns;
poperror();
free(s);
return n;
}
Dev ipdevtab =
{
'I',
"ip",
devreset,
ipinit,
devshutdown,
ipattach,
ipwalk,
ipstat,
ipopen,
devcreate,
ipclose,
ipread,
devbread,
ipwrite,
devbwrite,
devremove,
devwstat,
};