4d54ec7898
SLIRP -smb support wants to fork a process and forget about reaping it. To please it, add a generic service to register a process id and let QEMU reap it. In the future it could be enhanced to pass a status, but this would be unused. With this in place, the SIGCHLD signal handler would not stomp on pclose anymore. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
410 lines
9.6 KiB
C
410 lines
9.6 KiB
C
/*
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* Copyright (c) 1995 Danny Gasparovski.
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*
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* Please read the file COPYRIGHT for the
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* terms and conditions of the copyright.
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*/
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#include <slirp.h>
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#include <libslirp.h>
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#include "monitor.h"
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#ifdef DEBUG
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int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
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#endif
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struct quehead {
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struct quehead *qh_link;
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struct quehead *qh_rlink;
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};
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inline void
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insque(void *a, void *b)
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{
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register struct quehead *element = (struct quehead *) a;
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register struct quehead *head = (struct quehead *) b;
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element->qh_link = head->qh_link;
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head->qh_link = (struct quehead *)element;
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element->qh_rlink = (struct quehead *)head;
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((struct quehead *)(element->qh_link))->qh_rlink
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= (struct quehead *)element;
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}
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inline void
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remque(void *a)
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{
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register struct quehead *element = (struct quehead *) a;
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((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
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((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
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element->qh_rlink = NULL;
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}
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int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
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struct in_addr addr, int port)
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{
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struct ex_list *tmp_ptr;
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/* First, check if the port is "bound" */
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for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
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if (port == tmp_ptr->ex_fport &&
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addr.s_addr == tmp_ptr->ex_addr.s_addr)
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return -1;
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}
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tmp_ptr = *ex_ptr;
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*ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
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(*ex_ptr)->ex_fport = port;
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(*ex_ptr)->ex_addr = addr;
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(*ex_ptr)->ex_pty = do_pty;
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(*ex_ptr)->ex_exec = (do_pty == 3) ? exec : strdup(exec);
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(*ex_ptr)->ex_next = tmp_ptr;
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return 0;
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}
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#ifndef HAVE_STRERROR
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/*
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* For systems with no strerror
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*/
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extern int sys_nerr;
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extern char *sys_errlist[];
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char *
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strerror(error)
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int error;
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{
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if (error < sys_nerr)
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return sys_errlist[error];
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else
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return "Unknown error.";
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}
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#endif
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#ifdef _WIN32
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int
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fork_exec(struct socket *so, const char *ex, int do_pty)
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{
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/* not implemented */
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return 0;
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}
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#else
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/*
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* XXX This is ugly
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* We create and bind a socket, then fork off to another
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* process, which connects to this socket, after which we
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* exec the wanted program. If something (strange) happens,
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* the accept() call could block us forever.
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*
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* do_pty = 0 Fork/exec inetd style
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* do_pty = 1 Fork/exec using slirp.telnetd
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* do_ptr = 2 Fork/exec using pty
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*/
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int
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fork_exec(struct socket *so, const char *ex, int do_pty)
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{
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int s;
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(addr);
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int opt;
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int master = -1;
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const char *argv[256];
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/* don't want to clobber the original */
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char *bptr;
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const char *curarg;
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int c, i, ret;
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pid_t pid;
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DEBUG_CALL("fork_exec");
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DEBUG_ARG("so = %lx", (long)so);
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DEBUG_ARG("ex = %lx", (long)ex);
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DEBUG_ARG("do_pty = %lx", (long)do_pty);
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if (do_pty == 2) {
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return 0;
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} else {
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addr.sin_family = AF_INET;
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addr.sin_port = 0;
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addr.sin_addr.s_addr = INADDR_ANY;
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if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
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bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
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listen(s, 1) < 0) {
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lprint("Error: inet socket: %s\n", strerror(errno));
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closesocket(s);
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return 0;
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}
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}
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pid = fork();
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switch(pid) {
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case -1:
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lprint("Error: fork failed: %s\n", strerror(errno));
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close(s);
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if (do_pty == 2)
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close(master);
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return 0;
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case 0:
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/* Set the DISPLAY */
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if (do_pty == 2) {
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(void) close(master);
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#ifdef TIOCSCTTY /* XXXXX */
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(void) setsid();
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ioctl(s, TIOCSCTTY, (char *)NULL);
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#endif
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} else {
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getsockname(s, (struct sockaddr *)&addr, &addrlen);
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close(s);
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/*
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* Connect to the socket
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* XXX If any of these fail, we're in trouble!
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*/
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s = qemu_socket(AF_INET, SOCK_STREAM, 0);
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addr.sin_addr = loopback_addr;
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do {
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ret = connect(s, (struct sockaddr *)&addr, addrlen);
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} while (ret < 0 && errno == EINTR);
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}
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dup2(s, 0);
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dup2(s, 1);
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dup2(s, 2);
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for (s = getdtablesize() - 1; s >= 3; s--)
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close(s);
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i = 0;
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bptr = qemu_strdup(ex); /* No need to free() this */
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if (do_pty == 1) {
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/* Setup "slirp.telnetd -x" */
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argv[i++] = "slirp.telnetd";
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argv[i++] = "-x";
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argv[i++] = bptr;
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} else
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do {
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/* Change the string into argv[] */
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curarg = bptr;
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while (*bptr != ' ' && *bptr != (char)0)
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bptr++;
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c = *bptr;
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*bptr++ = (char)0;
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argv[i++] = strdup(curarg);
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} while (c);
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argv[i] = NULL;
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execvp(argv[0], (char **)argv);
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/* Ooops, failed, let's tell the user why */
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fprintf(stderr, "Error: execvp of %s failed: %s\n",
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argv[0], strerror(errno));
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close(0); close(1); close(2); /* XXX */
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exit(1);
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default:
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qemu_add_child_watch(pid);
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if (do_pty == 2) {
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close(s);
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so->s = master;
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} else {
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/*
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* XXX this could block us...
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* XXX Should set a timer here, and if accept() doesn't
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* return after X seconds, declare it a failure
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* The only reason this will block forever is if socket()
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* of connect() fail in the child process
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*/
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do {
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so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
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} while (so->s < 0 && errno == EINTR);
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closesocket(s);
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opt = 1;
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setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
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opt = 1;
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setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
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}
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fd_nonblock(so->s);
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/* Append the telnet options now */
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if (so->so_m != NULL && do_pty == 1) {
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sbappend(so, so->so_m);
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so->so_m = NULL;
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}
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return 1;
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}
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}
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#endif
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#ifndef HAVE_STRDUP
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char *
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strdup(str)
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const char *str;
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{
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char *bptr;
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bptr = (char *)malloc(strlen(str)+1);
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strcpy(bptr, str);
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return bptr;
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}
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#endif
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#include "monitor.h"
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void lprint(const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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monitor_vprintf(default_mon, format, args);
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va_end(args);
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}
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void
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u_sleep(int usec)
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{
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struct timeval t;
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fd_set fdset;
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FD_ZERO(&fdset);
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t.tv_sec = 0;
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t.tv_usec = usec * 1000;
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select(0, &fdset, &fdset, &fdset, &t);
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}
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/*
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* Set fd blocking and non-blocking
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*/
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void
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fd_nonblock(int fd)
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{
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#ifdef FIONBIO
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#ifdef _WIN32
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unsigned long opt = 1;
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#else
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int opt = 1;
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#endif
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ioctlsocket(fd, FIONBIO, &opt);
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#else
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int opt;
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opt = fcntl(fd, F_GETFL, 0);
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opt |= O_NONBLOCK;
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fcntl(fd, F_SETFL, opt);
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#endif
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}
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void
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fd_block(int fd)
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{
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#ifdef FIONBIO
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#ifdef _WIN32
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unsigned long opt = 0;
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#else
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int opt = 0;
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#endif
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ioctlsocket(fd, FIONBIO, &opt);
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#else
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int opt;
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opt = fcntl(fd, F_GETFL, 0);
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opt &= ~O_NONBLOCK;
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fcntl(fd, F_SETFL, opt);
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#endif
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}
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void slirp_connection_info(Slirp *slirp, Monitor *mon)
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{
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const char * const tcpstates[] = {
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[TCPS_CLOSED] = "CLOSED",
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[TCPS_LISTEN] = "LISTEN",
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[TCPS_SYN_SENT] = "SYN_SENT",
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[TCPS_SYN_RECEIVED] = "SYN_RCVD",
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[TCPS_ESTABLISHED] = "ESTABLISHED",
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[TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
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[TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
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[TCPS_CLOSING] = "CLOSING",
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[TCPS_LAST_ACK] = "LAST_ACK",
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[TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
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[TCPS_TIME_WAIT] = "TIME_WAIT",
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};
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struct in_addr dst_addr;
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struct sockaddr_in src;
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socklen_t src_len;
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uint16_t dst_port;
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struct socket *so;
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const char *state;
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char buf[20];
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int n;
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monitor_printf(mon, " Protocol[State] FD Source Address Port "
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"Dest. Address Port RecvQ SendQ\n");
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for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
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if (so->so_state & SS_HOSTFWD) {
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state = "HOST_FORWARD";
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} else if (so->so_tcpcb) {
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state = tcpstates[so->so_tcpcb->t_state];
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} else {
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state = "NONE";
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}
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if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
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src_len = sizeof(src);
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getsockname(so->s, (struct sockaddr *)&src, &src_len);
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dst_addr = so->so_laddr;
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dst_port = so->so_lport;
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} else {
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src.sin_addr = so->so_laddr;
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src.sin_port = so->so_lport;
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dst_addr = so->so_faddr;
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dst_port = so->so_fport;
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}
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n = snprintf(buf, sizeof(buf), " TCP[%s]", state);
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memset(&buf[n], ' ', 19 - n);
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buf[19] = 0;
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monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
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src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
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ntohs(src.sin_port));
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monitor_printf(mon, "%15s %5d %5d %5d\n",
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inet_ntoa(dst_addr), ntohs(dst_port),
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so->so_rcv.sb_cc, so->so_snd.sb_cc);
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}
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for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
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if (so->so_state & SS_HOSTFWD) {
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n = snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
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src_len = sizeof(src);
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getsockname(so->s, (struct sockaddr *)&src, &src_len);
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dst_addr = so->so_laddr;
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dst_port = so->so_lport;
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} else {
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n = snprintf(buf, sizeof(buf), " UDP[%d sec]",
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(so->so_expire - curtime) / 1000);
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src.sin_addr = so->so_laddr;
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src.sin_port = so->so_lport;
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dst_addr = so->so_faddr;
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dst_port = so->so_fport;
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}
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memset(&buf[n], ' ', 19 - n);
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buf[19] = 0;
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monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
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src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
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ntohs(src.sin_port));
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monitor_printf(mon, "%15s %5d %5d %5d\n",
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inet_ntoa(dst_addr), ntohs(dst_port),
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so->so_rcv.sb_cc, so->so_snd.sb_cc);
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}
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}
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