slirp/misc.c - qemu - Git at Google

 /*
  * Copyright (c) 1995 Danny Gasparovski.
  *
  * Please read the file COPYRIGHT for the
  * terms and conditions of the copyright.
  */

 #include "qemu/osdep.h"
 #include "slirp.h"
 #include "libslirp.h"
 #include "monitor/monitor.h"
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"

 #ifdef DEBUG
 int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
 #endif

 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 = g_new(struct ex_list, 1);
 	(*ex_ptr)->ex_fport = port;
 	(*ex_ptr)->ex_addr = addr;
 	(*ex_ptr)->ex_pty = do_pty;
 	(*ex_ptr)->ex_exec = (do_pty == 3) ? exec : g_strdup(exec);
 	(*ex_ptr)->ex_next = tmp_ptr;
 	return 0;
 }


 #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;
 	const char *argv[256];
 	/* don't want to clobber the original */
 	char *bptr;
 	const char *curarg;
 	int c, i, ret;
 	pid_t pid;

 	DEBUG_CALL("fork_exec");
 	DEBUG_ARG("so = %p", so);
 	DEBUG_ARG("ex = %p", ex);
 	DEBUG_ARG("do_pty = %x", 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) {
 			error_report("Error: inet socket: %s", strerror(errno));
 			closesocket(s);

 			return 0;
 		}
 	}

 	pid = fork();
 	switch(pid) {
 	 case -1:
 		error_report("Error: fork failed: %s", strerror(errno));
 		close(s);
 		return 0;

 	 case 0:
                 setsid();

 		/* Set the DISPLAY */
                 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 = g_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++] = g_strdup(curarg);
 		   } while (c);

                 argv[i] = NULL;
 		execvp(argv[0], (char **)argv);

 		/* Ooops, failed, let's tell the user why */
         fprintf(stderr, "Error: execvp of %s failed: %s\n",
                 argv[0], strerror(errno));
 		close(0); close(1); close(2); /* XXX */
 		exit(1);

 	 default:
 		qemu_add_child_watch(pid);
                 /*
                  * 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);
                 socket_set_fast_reuse(so->s);
                 opt = 1;
                 qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
 		qemu_set_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

 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];

     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;
         }
         snprintf(buf, sizeof(buf), "  TCP[%s]", state);
         monitor_printf(mon, "%-19s %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) {
             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 {
             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;
         }
         monitor_printf(mon, "%-19s %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->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
         snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
                      (so->so_expire - curtime) / 1000);
         src.sin_addr = so->so_laddr;
         dst_addr = so->so_faddr;
         monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,
                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
         monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
     }
 }
	/*
	* Copyright (c) 1995 Danny Gasparovski.
	*
	* Please read the file COPYRIGHT for the
	* terms and conditions of the copyright.
	*/

	#include "qemu/osdep.h"
	#include "slirp.h"
	#include "libslirp.h"
	#include "monitor/monitor.h"
	#include "qemu/error-report.h"
	#include "qemu/main-loop.h"

	#ifdef DEBUG
	int slirp_debug = DBG_CALL\|DBG_MISC\|DBG_ERROR;
	#endif

	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 = g_new(struct ex_list, 1);
	(*ex_ptr)->ex_fport = port;
	(*ex_ptr)->ex_addr = addr;
	(*ex_ptr)->ex_pty = do_pty;
	(*ex_ptr)->ex_exec = (do_pty == 3) ? exec : g_strdup(exec);
	(*ex_ptr)->ex_next = tmp_ptr;
	return 0;
	}


	#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;
	const char *argv[256];
	/* don't want to clobber the original */
	char *bptr;
	const char *curarg;
	int c, i, ret;
	pid_t pid;

	DEBUG_CALL("fork_exec");
	DEBUG_ARG("so = %p", so);
	DEBUG_ARG("ex = %p", ex);
	DEBUG_ARG("do_pty = %x", 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) {
	error_report("Error: inet socket: %s", strerror(errno));
	closesocket(s);

	return 0;
	}
	}

	pid = fork();
	switch(pid) {
	case -1:
	error_report("Error: fork failed: %s", strerror(errno));
	close(s);
	return 0;

	case 0:
	setsid();

	/* Set the DISPLAY */
	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 = g_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++] = g_strdup(curarg);
	} while (c);

	argv[i] = NULL;
	execvp(argv[0], (char **)argv);

	/* Ooops, failed, let's tell the user why */
	fprintf(stderr, "Error: execvp of %s failed: %s\n",
	argv[0], strerror(errno));
	close(0); close(1); close(2); /* XXX */
	exit(1);

	default:
	qemu_add_child_watch(pid);
	/*
	* 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);
	socket_set_fast_reuse(so->s);
	opt = 1;
	qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
	qemu_set_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

	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];

	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;
	}
	snprintf(buf, sizeof(buf), " TCP[%s]", state);
	monitor_printf(mon, "%-19s %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) {
	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 {
	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;
	}
	monitor_printf(mon, "%-19s %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->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
	snprintf(buf, sizeof(buf), " ICMP[%d sec]",
	(so->so_expire - curtime) / 1000);
	src.sin_addr = so->so_laddr;
	dst_addr = so->so_faddr;
	monitor_printf(mon, "%-19s %3d %15s - ", buf, so->s,
	src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
	monitor_printf(mon, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
	so->so_rcv.sb_cc, so->so_snd.sb_cc);
	}
	}