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FRET-qemu/slirp/misc.c
Kevin Wolf 40ff6d7e8d Don't leak file descriptors 
We're leaking file descriptors to child processes. Set FD_CLOEXEC on file
descriptors that don't need to be passed to children to stop this misbehaviour.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03 11:45:50 -06:00

455 lines
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C
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/*
* Copyright (c) 1995 Danny Gasparovski.
*
* Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#include <slirp.h>
#include <libslirp.h>
#include "monitor.h"
#ifdef DEBUG
int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
#endif
struct quehead {
struct quehead *qh_link;
struct quehead *qh_rlink;
};
inline void
insque(void *a, void *b)
{
register struct quehead *element = (struct quehead *) a;
register struct quehead *head = (struct quehead *) b;
element->qh_link = head->qh_link;
head->qh_link = (struct quehead *)element;
element->qh_rlink = (struct quehead *)head;
((struct quehead *)(element->qh_link))->qh_rlink
= (struct quehead *)element;
}
inline void
remque(void *a)
{
register struct quehead *element = (struct quehead *) a;
((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
element->qh_rlink = NULL;
}
int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
struct in_addr addr, int port)
{
struct ex_list *tmp_ptr;
/* First, check if the port is "bound" */
for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
if (port == tmp_ptr->ex_fport &&
addr.s_addr == tmp_ptr->ex_addr.s_addr)
return -1;
}
tmp_ptr = *ex_ptr;
*ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
(*ex_ptr)->ex_fport = port;
(*ex_ptr)->ex_addr = addr;
(*ex_ptr)->ex_pty = do_pty;
(*ex_ptr)->ex_exec = (do_pty == 3) ? exec : strdup(exec);
(*ex_ptr)->ex_next = tmp_ptr;
return 0;
}
#ifndef HAVE_STRERROR
/*
* For systems with no strerror
*/
extern int sys_nerr;
extern char *sys_errlist[];
char *
strerror(error)
int error;
{
if (error < sys_nerr)
return sys_errlist[error];
else
return "Unknown error.";
}
#endif
#ifdef _WIN32
int
fork_exec(struct socket *so, const char *ex, int do_pty)
{
/* not implemented */
return 0;
}
#else
/*
* XXX This is ugly
* We create and bind a socket, then fork off to another
* process, which connects to this socket, after which we
* exec the wanted program. If something (strange) happens,
* the accept() call could block us forever.
*
* do_pty = 0 Fork/exec inetd style
* do_pty = 1 Fork/exec using slirp.telnetd
* do_ptr = 2 Fork/exec using pty
*/
int
fork_exec(struct socket *so, const char *ex, int do_pty)
{
int s;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
int opt;
int master = -1;
const char *argv[256];
/* don't want to clobber the original */
char *bptr;
const char *curarg;
int c, i, ret;
DEBUG_CALL("fork_exec");
DEBUG_ARG("so = %lx", (long)so);
DEBUG_ARG("ex = %lx", (long)ex);
DEBUG_ARG("do_pty = %lx", (long)do_pty);
if (do_pty == 2) {
return 0;
} else {
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = INADDR_ANY;
if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
listen(s, 1) < 0) {
lprint("Error: inet socket: %s\n", strerror(errno));
closesocket(s);
return 0;
}
}
switch(fork()) {
case -1:
lprint("Error: fork failed: %s\n", strerror(errno));
close(s);
if (do_pty == 2)
close(master);
return 0;
case 0:
/* Set the DISPLAY */
if (do_pty == 2) {
(void) close(master);
#ifdef TIOCSCTTY /* XXXXX */
(void) setsid();
ioctl(s, TIOCSCTTY, (char *)NULL);
#endif
} else {
getsockname(s, (struct sockaddr *)&addr, &addrlen);
close(s);
/*
* Connect to the socket
* XXX If any of these fail, we're in trouble!
*/
s = qemu_socket(AF_INET, SOCK_STREAM, 0);
addr.sin_addr = loopback_addr;
do {
ret = connect(s, (struct sockaddr *)&addr, addrlen);
} while (ret < 0 && errno == EINTR);
}
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);
for (s = getdtablesize() - 1; s >= 3; s--)
close(s);
i = 0;
bptr = strdup(ex); /* No need to free() this */
if (do_pty == 1) {
/* Setup "slirp.telnetd -x" */
argv[i++] = "slirp.telnetd";
argv[i++] = "-x";
argv[i++] = bptr;
} else
do {
/* Change the string into argv[] */
curarg = bptr;
while (*bptr != ' ' && *bptr != (char)0)
bptr++;
c = *bptr;
*bptr++ = (char)0;
argv[i++] = strdup(curarg);
} while (c);
argv[i] = NULL;
execvp(argv[0], (char **)argv);
/* Ooops, failed, let's tell the user why */
{
char buff[256];
snprintf(buff, sizeof(buff),
"Error: execvp of %s failed: %s\n",
argv[0], strerror(errno));
write(2, buff, strlen(buff)+1);
}
close(0); close(1); close(2); /* XXX */
exit(1);
default:
if (do_pty == 2) {
close(s);
so->s = master;
} else {
/*
* XXX this could block us...
* XXX Should set a timer here, and if accept() doesn't
* return after X seconds, declare it a failure
* The only reason this will block forever is if socket()
* of connect() fail in the child process
*/
do {
so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
} while (so->s < 0 && errno == EINTR);
closesocket(s);
opt = 1;
setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
opt = 1;
setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
}
fd_nonblock(so->s);
/* Append the telnet options now */
if (so->so_m != NULL && do_pty == 1) {
sbappend(so, so->so_m);
so->so_m = NULL;
}
return 1;
}
}
#endif
#ifndef HAVE_STRDUP
char *
strdup(str)
const char *str;
{
char *bptr;
bptr = (char *)malloc(strlen(str)+1);
strcpy(bptr, str);
return bptr;
}
#endif
#include "monitor.h"
void lprint(const char *format, ...)
{
va_list args;
va_start(args, format);
monitor_vprintf(cur_mon, format, args);
va_end(args);
}
#ifdef BAD_SPRINTF
#undef vsprintf
#undef sprintf
/*
* Some BSD-derived systems have a sprintf which returns char *
*/
int
vsprintf_len(string, format, args)
char *string;
const char *format;
va_list args;
{
vsprintf(string, format, args);
return strlen(string);
}
int
#ifdef __STDC__
sprintf_len(char *string, const char *format, ...)
#else
sprintf_len(va_alist) va_dcl
#endif
{
va_list args;
#ifdef __STDC__
va_start(args, format);
#else
char *string;
char *format;
va_start(args);
string = va_arg(args, char *);
format = va_arg(args, char *);
#endif
vsprintf(string, format, args);
return strlen(string);
}
#endif
void
u_sleep(int usec)
{
struct timeval t;
fd_set fdset;
FD_ZERO(&fdset);
t.tv_sec = 0;
t.tv_usec = usec * 1000;
select(0, &fdset, &fdset, &fdset, &t);
}
/*
* Set fd blocking and non-blocking
*/
void
fd_nonblock(int fd)
{
#ifdef FIONBIO
#ifdef _WIN32
unsigned long opt = 1;
#else
int opt = 1;
#endif
ioctlsocket(fd, FIONBIO, &opt);
#else
int opt;
opt = fcntl(fd, F_GETFL, 0);
opt |= O_NONBLOCK;
fcntl(fd, F_SETFL, opt);
#endif
}
void
fd_block(int fd)
{
#ifdef FIONBIO
#ifdef _WIN32
unsigned long opt = 0;
#else
int opt = 0;
#endif
ioctlsocket(fd, FIONBIO, &opt);
#else
int opt;
opt = fcntl(fd, F_GETFL, 0);
opt &= ~O_NONBLOCK;
fcntl(fd, F_SETFL, opt);
#endif
}
void slirp_connection_info(Slirp *slirp, Monitor *mon)
{
const char * const tcpstates[] = {
[TCPS_CLOSED] = "CLOSED",
[TCPS_LISTEN] = "LISTEN",
[TCPS_SYN_SENT] = "SYN_SENT",
[TCPS_SYN_RECEIVED] = "SYN_RCVD",
[TCPS_ESTABLISHED] = "ESTABLISHED",
[TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
[TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
[TCPS_CLOSING] = "CLOSING",
[TCPS_LAST_ACK] = "LAST_ACK",
[TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
[TCPS_TIME_WAIT] = "TIME_WAIT",
};
struct in_addr dst_addr;
struct sockaddr_in src;
socklen_t src_len;
uint16_t dst_port;
struct socket *so;
const char *state;
char buf[20];
int n;
monitor_printf(mon, " Protocol[State] FD Source Address Port "
"Dest. Address Port RecvQ SendQ\n");
for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
if (so->so_state & SS_HOSTFWD) {
state = "HOST_FORWARD";
} else if (so->so_tcpcb) {
state = tcpstates[so->so_tcpcb->t_state];
} else {
state = "NONE";
}
if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
src_len = sizeof(src);
getsockname(so->s, (struct sockaddr *)&src, &src_len);
dst_addr = so->so_laddr;
dst_port = so->so_lport;
} else {
src.sin_addr = so->so_laddr;
src.sin_port = so->so_lport;
dst_addr = so->so_faddr;
dst_port = so->so_fport;
}
n = snprintf(buf, sizeof(buf), " TCP[%s]", state);
memset(&buf[n], ' ', 19 - n);
buf[19] = 0;
monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
ntohs(src.sin_port));
monitor_printf(mon, "%15s %5d %5d %5d\n",
inet_ntoa(dst_addr), ntohs(dst_port),
so->so_rcv.sb_cc, so->so_snd.sb_cc);
}
for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
if (so->so_state & SS_HOSTFWD) {
n = snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
src_len = sizeof(src);
getsockname(so->s, (struct sockaddr *)&src, &src_len);
dst_addr = so->so_laddr;
dst_port = so->so_lport;
} else {
n = snprintf(buf, sizeof(buf), " UDP[%d sec]",
(so->so_expire - curtime) / 1000);
src.sin_addr = so->so_laddr;
src.sin_port = so->so_lport;
dst_addr = so->so_faddr;
dst_port = so->so_fport;
}
memset(&buf[n], ' ', 19 - n);
buf[19] = 0;
monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
ntohs(src.sin_port));
monitor_printf(mon, "%15s %5d %5d %5d\n",
inet_ntoa(dst_addr), ntohs(dst_port),
so->so_rcv.sb_cc, so->so_snd.sb_cc);
}
}
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