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#include "stdinc.h"
#include "9.h"
typedef struct Srv Srv;
struct Srv {
int fd;
int srvfd;
char* service;
char* mntpnt;
Srv* next;
Srv* prev;
};
static struct {
RWLock lock;
Srv* head;
Srv* tail;
} sbox;
#ifndef PLAN9PORT
static int
srvFd(char* name, int mode, int fd, char** mntpnt)
{
int n, srvfd;
char *p, buf[10];
/*
* Drop a file descriptor with given name and mode into /srv.
* Create with ORCLOSE and don't close srvfd so it will be removed
* automatically on process exit.
*/
p = smprint("/srv/%s", name);
if((srvfd = create(p, ORCLOSE|OWRITE, mode)) < 0){
vtfree(p);
p = smprint("#s/%s", name);
if((srvfd = create(p, ORCLOSE|OWRITE, mode)) < 0){
werrstr("create %s: %r", p);
vtfree(p);
return -1;
}
}
n = snprint(buf, sizeof(buf), "%d", fd);
if(write(srvfd, buf, n) < 0){
close(srvfd);
werrstr("write %s: %r", p);
vtfree(p);
return -1;
}
*mntpnt = p;
return srvfd;
}
#endif
static void
srvFree(Srv* srv)
{
if(srv->prev != nil)
srv->prev->next = srv->next;
else
sbox.head = srv->next;
if(srv->next != nil)
srv->next->prev = srv->prev;
else
sbox.tail = srv->prev;
if(srv->srvfd != -1)
close(srv->srvfd);
vtfree(srv->service);
vtfree(srv->mntpnt);
vtfree(srv);
}
static Srv*
srvAlloc(char* service, int mode, int fd)
{
Dir *dir;
Srv *srv;
int srvfd;
char *mntpnt;
wlock(&sbox.lock);
for(srv = sbox.head; srv != nil; srv = srv->next){
if(strcmp(srv->service, service) != 0)
continue;
/*
* If the service exists, but is stale,
* free it up and let the name be reused.
*/
if((dir = dirfstat(srv->srvfd)) != nil){
free(dir);
werrstr("srv: already serving '%s'", service);
wunlock(&sbox.lock);
return nil;
}
srvFree(srv);
break;
}
#ifdef PLAN9PORT
mntpnt = nil;
if((srvfd = post9pservice(fd, service, mntpnt)) < 0){
#else
if((srvfd = srvFd(service, mode, fd, &mntpnt)) < 0){
#endif
wunlock(&sbox.lock);
return nil;
}
close(fd);
srv = vtmallocz(sizeof(Srv));
srv->srvfd = srvfd;
srv->service = vtstrdup(service);
srv->mntpnt = mntpnt;
if(sbox.tail != nil){
srv->prev = sbox.tail;
sbox.tail->next = srv;
}
else{
sbox.head = srv;
srv->prev = nil;
}
sbox.tail = srv;
wunlock(&sbox.lock);
return srv;
}
static int
cmdSrv(int argc, char* argv[])
{
Con *con;
Srv *srv;
char *usage = "usage: srv [-APWdp] [service]";
int conflags, dflag, fd[2], mode, pflag, r;
dflag = 0;
pflag = 0;
conflags = 0;
mode = 0666;
ARGBEGIN{
default:
return cliError(usage);
case 'A':
conflags |= ConNoAuthCheck;
break;
case 'I':
conflags |= ConIPCheck;
break;
case 'N':
conflags |= ConNoneAllow;
break;
case 'P':
conflags |= ConNoPermCheck;
mode = 0600;
break;
case 'W':
conflags |= ConWstatAllow;
mode = 0600;
break;
case 'd':
dflag = 1;
break;
case 'p':
pflag = 1;
mode = 0600;
break;
}ARGEND
if(pflag && (conflags&ConNoPermCheck)){
werrstr("srv: cannot use -P with -p");
return 0;
}
switch(argc){
default:
return cliError(usage);
case 0:
rlock(&sbox.lock);
for(srv = sbox.head; srv != nil; srv = srv->next)
consPrint("\t%s\t%d\n", srv->service, srv->srvfd);
runlock(&sbox.lock);
return 1;
case 1:
if(!dflag)
break;
wlock(&sbox.lock);
for(srv = sbox.head; srv != nil; srv = srv->next){
if(strcmp(srv->service, argv[0]) != 0)
continue;
srvFree(srv);
break;
}
wunlock(&sbox.lock);
if(srv == nil){
werrstr("srv: '%s' not found", argv[0]);
return 0;
}
return 1;
}
#ifdef PLAN9PORT /* fossilcons unsupported */
if(pflag)
return 1;
#endif
if(pipe(fd) < 0){
werrstr("srv pipe: %r");
return 0;
}
if((srv = srvAlloc(argv[0], mode, fd[0])) == nil){
close(fd[0]); close(fd[1]);
return 0;
}
if(pflag)
r = consOpen(fd[1], srv->srvfd, -1);
else{
con = conAlloc(fd[1], srv->mntpnt, conflags);
if(con == nil)
r = 0;
else
r = 1;
}
if(r == 0){
close(fd[1]);
wlock(&sbox.lock);
srvFree(srv);
wunlock(&sbox.lock);
}
return r;
}
int
srvInit(void)
{
cliAddCmd("srv", cmdSrv);
return 1;
}
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