/* return 0 as parent, 1 as child */
static int godaemon(void)
{
uid_t nobody, nogrp;
struct passwd *pw;
switch (fork()) {
case -1:
bb_perror_msg_and_die("Could not fork");
case 0:
pw = getpwnam(nobodystr);
if (pw == NULL)
bb_error_msg_and_die("Cannot find uid/gid of user '%s'", nobodystr);
nobody = pw->pw_uid;
nogrp = pw->pw_gid;
writepid(nobody, nogrp);
close(0);
inetbind();
xsetgid(nogrp);
xsetuid(nobody);
close(1);
close(2);
signal(SIGHUP, SIG_IGN);
signal(SIGPIPE, SIG_IGN); /* connection closed when writing (raises ???) */
setsid();
openlog(bb_applet_name, 0, LOG_DAEMON);
return 1;
}
return 0;
}
int main(int argc, char * argv[])
{
uid_t nobody, nogrp;
memset(conns, 0, sizeof conns);
memset(&G, 0, sizeof G);
FD_ZERO(&G.readfds);
FD_SET(0, &G.readfds);
if (argv[1])
{
if (argv[1][0] == '-')
{
if (argv[1][1] == 'V')
{
printversion('.');
return 0;
}
else
{
fdprintf(2, "%s: invalid option -- %c\n", argv[0], argv[1][1]);
fdprintf(2, "Usage: %s [-V] " IU_IN_USAGESTR "\n", argv[0]);
return 1;
}
}
else
{
SET_IU(argv[1], argc - 1);
}
}
else
{
SET_IU(nobodystr, 1);
}
#ifndef DEBUG
close(1); /* not debugging, openlog() hopefully uses fd 1. */
#else
close(3); /* debugging, TRACE uses fd 1, openlog() hopefully fd 3 */
#endif
openlog("identd", LOG_CONS, LOG_DAEMON);
{
struct passwd * pw = getpwnam(nobodystr);
if (pw)
{
nobody = pw->pw_uid;
nogrp = pw->pw_gid;
}
else
{
syslog(LOG_CRIT, "Cannot find user `nobody': %s", strerrno());
return -1;
}
}
if (inetbind(getport()) < 0)
{
return -1;
}
/* */
{
int i;
for (i = FCS; i < MAXCONNS + FCS; i++)
{
close(i);
}
}
#ifdef DEBUG
#ifndef LOG_PERROR
#define LOG_PERROR 0
#endif
openlog("identd", LOG_PERROR, LOG_DAEMON);
#else /* not DEBUG */
godaemon();
openlog("identd", 0, LOG_DAEMON);
close(2);
signal(SIGHUP, SIG_IGN);
#endif /* DEBUG */
signal(SIGPIPE, SIG_IGN); /* connection closed when writing (raises ???) */
writepid(nobody, nogrp);
setegid(nogrp); setgid(nogrp); setuid(nobody); seteuid(nobody);
{
int i;
for (i = 0; i < 4; i++)
{
char * id = (char)NULL;
unsigned int rv = 0;
switch (i)
{
case 0:
rv = (unsigned int)getegid();
id = "egid";
break;
case 1:
rv = (unsigned int)getgid();
id = "gid";
break;
case 2:
rv = (unsigned int)geteuid();
id = "euid";
break;
case 3:
rv = (unsigned int)getuid();
id = "uid";
break;
}
if (rv == 0)
{
syslog(LOG_ERR,
"Can not drop all root privileges (%s) !!! %s !!!",
id, strerrno());
delpidfile();
return -1;
}
}
}
while (2)
{
fd_set rfds = G.readfds;
struct timeval tv = { 15, 0 };
int i;
int tim = time(NULL);
TRACE(("calling select(): n = %d, rfds = 0x%x\n\n",
G.conncnt + FCS, *(int *)&rfds));
select(G.conncnt + FCS, &rfds, NULL, NULL, G.conncnt? &tv: NULL);
for (i = G.conncnt - 1; i >= 0; i--)
{
int s = i + FCS;
if (FD_ISSET(s, &rfds))
{
char * buf = conns[i].buf;
unsigned int len = conns[i].len;
unsigned int l;
TRACE(("data socket fd_isset %d\n", s));
if ((int)(l = read(s, buf + len, sizeof conns[0].buf - len)) > 0)
{
if (checkInput(buf, len, l))
{
reply(s, buf);
goto deleteconn;
}
else if (len + l >= sizeof conns[0].buf)
{
replyError(s, "X-INVALID-REQUEST");
goto deleteconn;
}
else
{
conns[i].len += l;
}
}
else
{
goto deleteconn;
}
conns[i].lasttime = tim;
continue;
deleteconn:
deleteConn(s);
}
else
{
/* implement as time_after() in linux kernel sources ... */
if (conns[i].lasttime + MAXIDLETIME <= tim)
{
replyError(s, "X-TIMEOUT");
deleteConn(s);
}
}
}
if (FD_ISSET(0, &rfds))
{
int s = accept(0, NULL, 0);
TRACE(("server socket fd_isset, %d accepted\n", s));
if (s < 0)
{
if (errno != EINTR) /* EINTR */
{
syslog(LOG_ERR, "accept: %s", strerrno());
}
}
else
{
if (G.conncnt == MAXCONNS)
{
i = closeOldest();
}
else
{
i = G.conncnt++;
}
if (s != i + FCS)
{
movesocket(s, i + FCS);
}
FD_SET(i + FCS, &G.readfds);
conns[i].len = 0;
conns[i].lasttime = time(NULL);
}
}
}
}
