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xemu/slirp/misc.c
pbrook f4e15b4b4b Fix slirp redirection on systems without a useful host IP address. 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1837 c046a42c-6fe2-441c-8c8c-71466251a162
2006-04-23 19:41:17 +00:00

947 lines
19 KiB
C
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/*
* Copyright (c) 1995 Danny Gasparovski.
*
* Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#define WANT_SYS_IOCTL_H
#include <slirp.h>
u_int curtime, time_fasttimo, last_slowtimo, detach_time;
u_int detach_wait = 600000; /* 10 minutes */
#if 0
int x_port = -1;
int x_display = 0;
int x_screen = 0;
int
show_x(buff, inso)
char *buff;
struct socket *inso;
{
if (x_port < 0) {
lprint("X Redir: X not being redirected.\r\n");
} else {
lprint("X Redir: In sh/bash/zsh/etc. type: DISPLAY=%s:%d.%d; export DISPLAY\r\n",
inet_ntoa(our_addr), x_port, x_screen);
lprint("X Redir: In csh/tcsh/etc. type: setenv DISPLAY %s:%d.%d\r\n",
inet_ntoa(our_addr), x_port, x_screen);
if (x_display)
lprint("X Redir: Redirecting to display %d\r\n", x_display);
}
return CFG_OK;
}
/*
* XXX Allow more than one X redirection?
*/
void
redir_x(inaddr, start_port, display, screen)
u_int32_t inaddr;
int start_port;
int display;
int screen;
{
int i;
if (x_port >= 0) {
lprint("X Redir: X already being redirected.\r\n");
show_x(0, 0);
} else {
for (i = 6001 + (start_port-1); i <= 6100; i++) {
if (solisten(htons(i), inaddr, htons(6000 + display), 0)) {
/* Success */
x_port = i - 6000;
x_display = display;
x_screen = screen;
show_x(0, 0);
return;
}
}
lprint("X Redir: Error: Couldn't redirect a port for X. Weird.\r\n");
}
}
#endif
#ifndef HAVE_INET_ATON
int
inet_aton(cp, ia)
const char *cp;
struct in_addr *ia;
{
u_int32_t addr = inet_addr(cp);
if (addr == 0xffffffff)
return 0;
ia->s_addr = addr;
return 1;
}
#endif
/*
* Get our IP address and put it in our_addr
*/
void
getouraddr()
{
char buff[256];
struct hostent *he = NULL;
if (gethostname(buff,256) == 0)
he = gethostbyname(buff);
if (he)
our_addr = *(struct in_addr *)he->h_addr;
/* If the host doesn't have a useful IP address then use the
guest side address. */
if (our_addr.s_addr == 0 || our_addr.s_addr == loopback_addr.s_addr)
our_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS);
}
#if SIZEOF_CHAR_P == 8
struct quehead_32 {
u_int32_t qh_link;
u_int32_t qh_rlink;
};
inline void
insque_32(a, b)
void *a;
void *b;
{
register struct quehead_32 *element = (struct quehead_32 *) a;
register struct quehead_32 *head = (struct quehead_32 *) b;
element->qh_link = head->qh_link;
head->qh_link = (u_int32_t)element;
element->qh_rlink = (u_int32_t)head;
((struct quehead_32 *)(element->qh_link))->qh_rlink
= (u_int32_t)element;
}
inline void
remque_32(a)
void *a;
{
register struct quehead_32 *element = (struct quehead_32 *) a;
((struct quehead_32 *)(element->qh_link))->qh_rlink = element->qh_rlink;
((struct quehead_32 *)(element->qh_rlink))->qh_link = element->qh_link;
element->qh_rlink = 0;
}
#endif /* SIZEOF_CHAR_P == 8 */
struct quehead {
struct quehead *qh_link;
struct quehead *qh_rlink;
};
inline void
insque(a, b)
void *a, *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(a)
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;
/* element->qh_link = NULL; TCP FIN1 crashes if you do this. Why ? */
}
/* #endif */
int
add_exec(ex_ptr, do_pty, exec, addr, port)
struct ex_list **ex_ptr;
int do_pty;
char *exec;
int 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 == tmp_ptr->ex_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 = 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(so, ex, do_pty)
struct socket *so;
char *ex;
int do_pty;
{
/* not implemented */
return 0;
}
#else
int
slirp_openpty(amaster, aslave)
int *amaster, *aslave;
{
register int master, slave;
#ifdef HAVE_GRANTPT
char *ptr;
if ((master = open("/dev/ptmx", O_RDWR)) < 0 ||
grantpt(master) < 0 ||
unlockpt(master) < 0 ||
(ptr = ptsname(master)) == NULL) {
close(master);
return -1;
}
if ((slave = open(ptr, O_RDWR)) < 0 ||
ioctl(slave, I_PUSH, "ptem") < 0 ||
ioctl(slave, I_PUSH, "ldterm") < 0 ||
ioctl(slave, I_PUSH, "ttcompat") < 0) {
close(master);
close(slave);
return -1;
}
*amaster = master;
*aslave = slave;
return 0;
#else
static char line[] = "/dev/ptyXX";
register const char *cp1, *cp2;
for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
line[8] = *cp1;
for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
line[9] = *cp2;
if ((master = open(line, O_RDWR, 0)) == -1) {
if (errno == ENOENT)
return (-1); /* out of ptys */
} else {
line[5] = 't';
/* These will fail */
(void) chown(line, getuid(), 0);
(void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
#ifdef HAVE_REVOKE
(void) revoke(line);
#endif
if ((slave = open(line, O_RDWR, 0)) != -1) {
*amaster = master;
*aslave = slave;
return 0;
}
(void) close(master);
line[5] = 'p';
}
}
}
errno = ENOENT; /* out of ptys */
return (-1);
#endif
}
/*
* 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(so, ex, do_pty)
struct socket *so;
char *ex;
int do_pty;
{
int s;
struct sockaddr_in addr;
int addrlen = sizeof(addr);
int opt;
int master;
char *argv[256];
#if 0
char buff[256];
#endif
/* don't want to clobber the original */
char *bptr;
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) {
if (slirp_openpty(&master, &s) == -1) {
lprint("Error: openpty failed: %s\n", strerror(errno));
return 0;
}
} else {
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = INADDR_ANY;
if ((s = 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 = socket(AF_INET, SOCK_STREAM, 0);
addr.sin_addr = loopback_addr;
do {
ret = connect(s, (struct sockaddr *)&addr, addrlen);
} while (ret < 0 && errno == EINTR);
}
#if 0
if (x_port >= 0) {
#ifdef HAVE_SETENV
sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
setenv("DISPLAY", buff, 1);
#else
sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
putenv(buff);
#endif
}
#endif
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);
for (s = 3; s <= 255; 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] = 0;
execvp(argv[0], argv);
/* Ooops, failed, let's tell the user why */
{
char buff[256];
sprintf(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 != 0 && do_pty == 1) {
sbappend(so, so->so_m);
so->so_m = 0;
}
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
#if 0
void
snooze_hup(num)
int num;
{
int s, ret;
#ifndef NO_UNIX_SOCKETS
struct sockaddr_un sock_un;
#endif
struct sockaddr_in sock_in;
char buff[256];
ret = -1;
if (slirp_socket_passwd) {
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
slirp_exit(1);
sock_in.sin_family = AF_INET;
sock_in.sin_addr.s_addr = slirp_socket_addr;
sock_in.sin_port = htons(slirp_socket_port);
if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)
slirp_exit(1); /* just exit...*/
sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);
write(s, buff, strlen(buff)+1);
}
#ifndef NO_UNIX_SOCKETS
else {
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0)
slirp_exit(1);
sock_un.sun_family = AF_UNIX;
strcpy(sock_un.sun_path, socket_path);
if (connect(s, (struct sockaddr *)&sock_un,
sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)
slirp_exit(1);
sprintf(buff, "kill none:%d", slirp_socket_unit);
write(s, buff, strlen(buff)+1);
}
#endif
slirp_exit(0);
}
void
snooze()
{
sigset_t s;
int i;
/* Don't need our data anymore */
/* XXX This makes SunOS barf */
/* brk(0); */
/* Close all fd's */
for (i = 255; i >= 0; i--)
close(i);
signal(SIGQUIT, slirp_exit);
signal(SIGHUP, snooze_hup);
sigemptyset(&s);
/* Wait for any signal */
sigsuspend(&s);
/* Just in case ... */
exit(255);
}
void
relay(s)
int s;
{
char buf[8192];
int n;
fd_set readfds;
struct ttys *ttyp;
/* Don't need our data anymore */
/* XXX This makes SunOS barf */
/* brk(0); */
signal(SIGQUIT, slirp_exit);
signal(SIGHUP, slirp_exit);
signal(SIGINT, slirp_exit);
signal(SIGTERM, slirp_exit);
/* Fudge to get term_raw and term_restore to work */
if (NULL == (ttyp = tty_attach (0, slirp_tty))) {
lprint ("Error: tty_attach failed in misc.c:relay()\r\n");
slirp_exit (1);
}
ttyp->fd = 0;
ttyp->flags |= TTY_CTTY;
term_raw(ttyp);
while (1) {
FD_ZERO(&readfds);
FD_SET(0, &readfds);
FD_SET(s, &readfds);
n = select(s+1, &readfds, (fd_set *)0, (fd_set *)0, (struct timeval *)0);
if (n <= 0)
slirp_exit(0);
if (FD_ISSET(0, &readfds)) {
n = read(0, buf, 8192);
if (n <= 0)
slirp_exit(0);
n = writen(s, buf, n);
if (n <= 0)
slirp_exit(0);
}
if (FD_ISSET(s, &readfds)) {
n = read(s, buf, 8192);
if (n <= 0)
slirp_exit(0);
n = writen(0, buf, n);
if (n <= 0)
slirp_exit(0);
}
}
/* Just in case.... */
exit(1);
}
#endif
int (*lprint_print) _P((void *, const char *, va_list));
char *lprint_ptr, *lprint_ptr2, **lprint_arg;
void
#ifdef __STDC__
lprint(const char *format, ...)
#else
lprint(va_alist) va_dcl
#endif
{
va_list args;
#ifdef __STDC__
va_start(args, format);
#else
char *format;
va_start(args);
format = va_arg(args, char *);
#endif
#if 0
/* If we're printing to an sbuf, make sure there's enough room */
/* XXX +100? */
if (lprint_sb) {
if ((lprint_ptr - lprint_sb->sb_wptr) >=
(lprint_sb->sb_datalen - (strlen(format) + 100))) {
int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;
int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;
int deltap = lprint_ptr - lprint_sb->sb_data;
lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,
lprint_sb->sb_datalen + TCP_SNDSPACE);
/* Adjust all values */
lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;
lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;
lprint_ptr = lprint_sb->sb_data + deltap;
lprint_sb->sb_datalen += TCP_SNDSPACE;
}
}
#endif
if (lprint_print)
lprint_ptr += (*lprint_print)(*lprint_arg, format, args);
/* Check if they want output to be logged to file as well */
if (lfd) {
/*
* Remove \r's
* otherwise you'll get ^M all over the file
*/
int len = strlen(format);
char *bptr1, *bptr2;
bptr1 = bptr2 = strdup(format);
while (len--) {
if (*bptr1 == '\r')
memcpy(bptr1, bptr1+1, len+1);
else
bptr1++;
}
vfprintf(lfd, bptr2, args);
free(bptr2);
}
va_end(args);
}
void
add_emu(buff)
char *buff;
{
u_int lport, fport;
u_int8_t tos = 0, emu = 0;
char buff1[256], buff2[256], buff4[128];
char *buff3 = buff4;
struct emu_t *emup;
struct socket *so;
if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {
lprint("Error: Bad arguments\r\n");
return;
}
if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {
lport = 0;
if (sscanf(buff1, "%d", &fport) != 1) {
lprint("Error: Bad first argument\r\n");
return;
}
}
if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {
buff3 = 0;
if (sscanf(buff2, "%256s", buff1) != 1) {
lprint("Error: Bad second argument\r\n");
return;
}
}
if (buff3) {
if (strcmp(buff3, "lowdelay") == 0)
tos = IPTOS_LOWDELAY;
else if (strcmp(buff3, "throughput") == 0)
tos = IPTOS_THROUGHPUT;
else {
lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");
return;
}
}
if (strcmp(buff1, "ftp") == 0)
emu = EMU_FTP;
else if (strcmp(buff1, "irc") == 0)
emu = EMU_IRC;
else if (strcmp(buff1, "none") == 0)
emu = EMU_NONE; /* ie: no emulation */
else {
lprint("Error: Unknown service\r\n");
return;
}
/* First, check that it isn't already emulated */
for (emup = tcpemu; emup; emup = emup->next) {
if (emup->lport == lport && emup->fport == fport) {
lprint("Error: port already emulated\r\n");
return;
}
}
/* link it */
emup = (struct emu_t *)malloc(sizeof (struct emu_t));
emup->lport = (u_int16_t)lport;
emup->fport = (u_int16_t)fport;
emup->tos = tos;
emup->emu = emu;
emup->next = tcpemu;
tcpemu = emup;
/* And finally, mark all current sessions, if any, as being emulated */
for (so = tcb.so_next; so != &tcb; so = so->so_next) {
if ((lport && lport == ntohs(so->so_lport)) ||
(fport && fport == ntohs(so->so_fport))) {
if (emu)
so->so_emu = emu;
if (tos)
so->so_iptos = tos;
}
}
lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);
}
#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(usec)
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(fd)
int fd;
{
#ifdef FIONBIO
int opt = 1;
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(fd)
int fd;
{
#ifdef FIONBIO
int opt = 0;
ioctlsocket(fd, FIONBIO, &opt);
#else
int opt;
opt = fcntl(fd, F_GETFL, 0);
opt &= ~O_NONBLOCK;
fcntl(fd, F_SETFL, opt);
#endif
}
#if 0
/*
* invoke RSH
*/
int
rsh_exec(so,ns, user, host, args)
struct socket *so;
struct socket *ns;
char *user;
char *host;
char *args;
{
int fd[2];
int fd0[2];
int s;
char buff[256];
DEBUG_CALL("rsh_exec");
DEBUG_ARG("so = %lx", (long)so);
if (pipe(fd)<0) {
lprint("Error: pipe failed: %s\n", strerror(errno));
return 0;
}
/* #ifdef HAVE_SOCKETPAIR */
#if 1
if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {
close(fd[0]);
close(fd[1]);
lprint("Error: openpty failed: %s\n", strerror(errno));
return 0;
}
#else
if (slirp_openpty(&fd0[0], &fd0[1]) == -1) {
close(fd[0]);
close(fd[1]);
lprint("Error: openpty failed: %s\n", strerror(errno));
return 0;
}
#endif
switch(fork()) {
case -1:
lprint("Error: fork failed: %s\n", strerror(errno));
close(fd[0]);
close(fd[1]);
close(fd0[0]);
close(fd0[1]);
return 0;
case 0:
close(fd[0]);
close(fd0[0]);
/* Set the DISPLAY */
if (x_port >= 0) {
#ifdef HAVE_SETENV
sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
setenv("DISPLAY", buff, 1);
#else
sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
putenv(buff);
#endif
}
dup2(fd0[1], 0);
dup2(fd0[1], 1);
dup2(fd[1], 2);
for (s = 3; s <= 255; s++)
close(s);
execlp("rsh","rsh","-l", user, host, args, NULL);
/* Ooops, failed, let's tell the user why */
sprintf(buff, "Error: execlp of %s failed: %s\n",
"rsh", strerror(errno));
write(2, buff, strlen(buff)+1);
close(0); close(1); close(2); /* XXX */
exit(1);
default:
close(fd[1]);
close(fd0[1]);
ns->s=fd[0];
so->s=fd0[0];
return 1;
}
}
#endif
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