src/slirp/misc.c

/*
 * 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;
        
        if (gethostname(buff,256) < 0)
           return;
        
        if ((he = gethostbyname(buff)) == NULL)
           return;
        
        our_addr = *(struct in_addr *)he->h_addr;
}

#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;
        socklen_t 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
Revision:	1.2
Committed:	2005-06-30T21:25:26Z (19 years, 4 months ago) by cebix
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+1 -1 lines
Log Message:	minor cleanups
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* Copyright (c) 1995 Danny Gasparovski.
3			*
4			* Please read the file COPYRIGHT for the
5			* terms and conditions of the copyright.
6			*/
7
8			#define WANT_SYS_IOCTL_H
9			#include <slirp.h>
10
11			u_int curtime, time_fasttimo, last_slowtimo, detach_time;
12			u_int detach_wait = 600000; /* 10 minutes */
13
14			#if 0
15			int x_port = -1;
16			int x_display = 0;
17			int x_screen = 0;
18
19			int
20			show_x(buff, inso)
21			char *buff;
22			struct socket *inso;
23			{
24			if (x_port < 0) {
25			lprint("X Redir: X not being redirected.\r\n");
26			} else {
27			lprint("X Redir: In sh/bash/zsh/etc. type: DISPLAY=%s:%d.%d; export DISPLAY\r\n",
28			inet_ntoa(our_addr), x_port, x_screen);
29			lprint("X Redir: In csh/tcsh/etc. type: setenv DISPLAY %s:%d.%d\r\n",
30			inet_ntoa(our_addr), x_port, x_screen);
31			if (x_display)
32			lprint("X Redir: Redirecting to display %d\r\n", x_display);
33			}
34
35			return CFG_OK;
36			}
37
38
39			/*
40			* XXX Allow more than one X redirection?
41			*/
42			void
43			redir_x(inaddr, start_port, display, screen)
44			u_int32_t inaddr;
45			int start_port;
46			int display;
47			int screen;
48			{
49			int i;
50
51			if (x_port >= 0) {
52			lprint("X Redir: X already being redirected.\r\n");
53			show_x(0, 0);
54			} else {
55			for (i = 6001 + (start_port-1); i <= 6100; i++) {
56			if (solisten(htons(i), inaddr, htons(6000 + display), 0)) {
57			/* Success */
58			x_port = i - 6000;
59			x_display = display;
60			x_screen = screen;
61			show_x(0, 0);
62			return;
63			}
64			}
65			lprint("X Redir: Error: Couldn't redirect a port for X. Weird.\r\n");
66			}
67			}
68			#endif
69
70			#ifndef HAVE_INET_ATON
71			int
72			inet_aton(cp, ia)
73			const char *cp;
74			struct in_addr *ia;
75			{
76			u_int32_t addr = inet_addr(cp);
77			if (addr == 0xffffffff)
78			return 0;
79			ia->s_addr = addr;
80			return 1;
81			}
82			#endif
83
84			/*
85			* Get our IP address and put it in our_addr
86			*/
87			void
88			getouraddr()
89			{
90			char buff[256];
91			struct hostent *he;
92
93			if (gethostname(buff,256) < 0)
94			return;
95
96			if ((he = gethostbyname(buff)) == NULL)
97			return;
98
99			our_addr = (struct in_addr )he->h_addr;
100			}
101
102			#if SIZEOF_CHAR_P == 8
103
104			struct quehead_32 {
105			u_int32_t qh_link;
106			u_int32_t qh_rlink;
107			};
108
109			inline void
110			insque_32(a, b)
111			void *a;
112			void *b;
113			{
114			register struct quehead_32 element = (struct quehead_32 ) a;
115			register struct quehead_32 head = (struct quehead_32 ) b;
116			element->qh_link = head->qh_link;
117			head->qh_link = (u_int32_t)element;
118			element->qh_rlink = (u_int32_t)head;
119			((struct quehead_32 *)(element->qh_link))->qh_rlink
120			= (u_int32_t)element;
121			}
122
123			inline void
124			remque_32(a)
125			void *a;
126			{
127			register struct quehead_32 element = (struct quehead_32 ) a;
128			((struct quehead_32 *)(element->qh_link))->qh_rlink = element->qh_rlink;
129			((struct quehead_32 *)(element->qh_rlink))->qh_link = element->qh_link;
130			element->qh_rlink = 0;
131			}
132
133			#endif /* SIZEOF_CHAR_P == 8 */
134
135			struct quehead {
136			struct quehead *qh_link;
137			struct quehead *qh_rlink;
138			};
139
140			inline void
141			insque(a, b)
142			void a, b;
143			{
144			register struct quehead element = (struct quehead ) a;
145			register struct quehead head = (struct quehead ) b;
146			element->qh_link = head->qh_link;
147			head->qh_link = (struct quehead *)element;
148			element->qh_rlink = (struct quehead *)head;
149			((struct quehead *)(element->qh_link))->qh_rlink
150			= (struct quehead *)element;
151			}
152
153			inline void
154			remque(a)
155			void *a;
156			{
157			register struct quehead element = (struct quehead ) a;
158			((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
159			((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
160			element->qh_rlink = NULL;
161			/* element->qh_link = NULL; TCP FIN1 crashes if you do this. Why ? */
162			}
163
164			/* #endif */
165
166
167			int
168			add_exec(ex_ptr, do_pty, exec, addr, port)
169			struct ex_list **ex_ptr;
170			int do_pty;
171			char *exec;
172			int addr;
173			int port;
174			{
175			struct ex_list *tmp_ptr;
176
177			/* First, check if the port is "bound" */
178			for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
179			if (port == tmp_ptr->ex_fport && addr == tmp_ptr->ex_addr)
180			return -1;
181			}
182
183			tmp_ptr = *ex_ptr;
184			ex_ptr = (struct ex_list )malloc(sizeof(struct ex_list));
185			(*ex_ptr)->ex_fport = port;
186			(*ex_ptr)->ex_addr = addr;
187			(*ex_ptr)->ex_pty = do_pty;
188			(*ex_ptr)->ex_exec = strdup(exec);
189			(*ex_ptr)->ex_next = tmp_ptr;
190			return 0;
191			}
192
193			#ifndef HAVE_STRERROR
194
195			/*
196			* For systems with no strerror
197			*/
198
199			extern int sys_nerr;
200			extern char *sys_errlist[];
201
202			char *
203			strerror(error)
204			int error;
205			{
206			if (error < sys_nerr)
207			return sys_errlist[error];
208			else
209			return "Unknown error.";
210			}
211
212			#endif
213
214
215			#ifdef _WIN32
216
217			int
218			fork_exec(so, ex, do_pty)
219			struct socket *so;
220			char *ex;
221			int do_pty;
222			{
223			/* not implemented */
224			return 0;
225			}
226
227			#else
228
229			int
230			slirp_openpty(amaster, aslave)
231			int amaster, aslave;
232			{
233			register int master, slave;
234
235			#ifdef HAVE_GRANTPT
236			char *ptr;
237
238			if ((master = open("/dev/ptmx", O_RDWR)) < 0 \|\|
239			grantpt(master) < 0 \|\|
240			unlockpt(master) < 0 \|\|
241			(ptr = ptsname(master)) == NULL) {
242			close(master);
243			return -1;
244			}
245
246			if ((slave = open(ptr, O_RDWR)) < 0 \|\|
247			ioctl(slave, I_PUSH, "ptem") < 0 \|\|
248			ioctl(slave, I_PUSH, "ldterm") < 0 \|\|
249			ioctl(slave, I_PUSH, "ttcompat") < 0) {
250			close(master);
251			close(slave);
252			return -1;
253			}
254
255			*amaster = master;
256			*aslave = slave;
257			return 0;
258
259			#else
260
261			static char line[] = "/dev/ptyXX";
262			register const char cp1, cp2;
263
264			for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
265			line[8] = *cp1;
266			for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
267			line[9] = *cp2;
268			if ((master = open(line, O_RDWR, 0)) == -1) {
269			if (errno == ENOENT)
270			return (-1); /* out of ptys */
271			} else {
272			line[5] = 't';
273			/* These will fail */
274			(void) chown(line, getuid(), 0);
275			(void) chmod(line, S_IRUSR\|S_IWUSR\|S_IWGRP);
276			#ifdef HAVE_REVOKE
277			(void) revoke(line);
278			#endif
279			if ((slave = open(line, O_RDWR, 0)) != -1) {
280			*amaster = master;
281			*aslave = slave;
282			return 0;
283			}
284			(void) close(master);
285			line[5] = 'p';
286			}
287			}
288			}
289			errno = ENOENT; /* out of ptys */
290			return (-1);
291			#endif
292			}
293
294			/*
295			* XXX This is ugly
296			* We create and bind a socket, then fork off to another
297			* process, which connects to this socket, after which we
298			* exec the wanted program. If something (strange) happens,
299			* the accept() call could block us forever.
300			*
301			* do_pty = 0 Fork/exec inetd style
302			* do_pty = 1 Fork/exec using slirp.telnetd
303			* do_ptr = 2 Fork/exec using pty
304			*/
305			int
306			fork_exec(so, ex, do_pty)
307			struct socket *so;
308			char *ex;
309			int do_pty;
310			{
311			int s;
312			struct sockaddr_in addr;
313	cebix	1.2	socklen_t addrlen = sizeof(addr);
314	gbeauche	1.1	int opt;
315			int master;
316			char *argv[256];
317			#if 0
318			char buff[256];
319			#endif
320			/* don't want to clobber the original */
321			char *bptr;
322			char *curarg;
323			int c, i, ret;
324
325			DEBUG_CALL("fork_exec");
326			DEBUG_ARG("so = %lx", (long)so);
327			DEBUG_ARG("ex = %lx", (long)ex);
328			DEBUG_ARG("do_pty = %lx", (long)do_pty);
329
330			if (do_pty == 2) {
331			if (slirp_openpty(&master, &s) == -1) {
332			lprint("Error: openpty failed: %s\n", strerror(errno));
333			return 0;
334			}
335			} else {
336			addr.sin_family = AF_INET;
337			addr.sin_port = 0;
338			addr.sin_addr.s_addr = INADDR_ANY;
339
340			if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 \|\|
341			bind(s, (struct sockaddr *)&addr, addrlen) < 0 \|\|
342			listen(s, 1) < 0) {
343			lprint("Error: inet socket: %s\n", strerror(errno));
344			closesocket(s);
345
346			return 0;
347			}
348			}
349
350			switch(fork()) {
351			case -1:
352			lprint("Error: fork failed: %s\n", strerror(errno));
353			close(s);
354			if (do_pty == 2)
355			close(master);
356			return 0;
357
358			case 0:
359			/* Set the DISPLAY */
360			if (do_pty == 2) {
361			(void) close(master);
362			#ifdef TIOCSCTTY /* XXXXX */
363			(void) setsid();
364			ioctl(s, TIOCSCTTY, (char *)NULL);
365			#endif
366			} else {
367			getsockname(s, (struct sockaddr *)&addr, &addrlen);
368			close(s);
369			/*
370			* Connect to the socket
371			* XXX If any of these fail, we're in trouble!
372			*/
373			s = socket(AF_INET, SOCK_STREAM, 0);
374			addr.sin_addr = loopback_addr;
375			do {
376			ret = connect(s, (struct sockaddr *)&addr, addrlen);
377			} while (ret < 0 && errno == EINTR);
378			}
379
380			#if 0
381			if (x_port >= 0) {
382			#ifdef HAVE_SETENV
383			sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
384			setenv("DISPLAY", buff, 1);
385			#else
386			sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
387			putenv(buff);
388			#endif
389			}
390			#endif
391			dup2(s, 0);
392			dup2(s, 1);
393			dup2(s, 2);
394			for (s = 3; s <= 255; s++)
395			close(s);
396
397			i = 0;
398			bptr = strdup(ex); /* No need to free() this */
399			if (do_pty == 1) {
400			/* Setup "slirp.telnetd -x" */
401			argv[i++] = "slirp.telnetd";
402			argv[i++] = "-x";
403			argv[i++] = bptr;
404			} else
405			do {
406			/* Change the string into argv[] */
407			curarg = bptr;
408			while (bptr != ' ' && bptr != (char)0)
409			bptr++;
410			c = *bptr;
411			*bptr++ = (char)0;
412			argv[i++] = strdup(curarg);
413			} while (c);
414
415			argv[i] = 0;
416			execvp(argv[0], argv);
417
418			/* Ooops, failed, let's tell the user why */
419			{
420			char buff[256];
421
422			sprintf(buff, "Error: execvp of %s failed: %s\n",
423			argv[0], strerror(errno));
424			write(2, buff, strlen(buff)+1);
425			}
426			close(0); close(1); close(2); /* XXX */
427			exit(1);
428
429			default:
430			if (do_pty == 2) {
431			close(s);
432			so->s = master;
433			} else {
434			/*
435			* XXX this could block us...
436			* XXX Should set a timer here, and if accept() doesn't
437			* return after X seconds, declare it a failure
438			* The only reason this will block forever is if socket()
439			* of connect() fail in the child process
440			*/
441			do {
442			so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
443			} while (so->s < 0 && errno == EINTR);
444			closesocket(s);
445			opt = 1;
446			setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
447			opt = 1;
448			setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
449			}
450			fd_nonblock(so->s);
451
452			/* Append the telnet options now */
453			if (so->so_m != 0 && do_pty == 1) {
454			sbappend(so, so->so_m);
455			so->so_m = 0;
456			}
457
458			return 1;
459			}
460			}
461			#endif
462
463			#ifndef HAVE_STRDUP
464			char *
465			strdup(str)
466			const char *str;
467			{
468			char *bptr;
469
470			bptr = (char *)malloc(strlen(str)+1);
471			strcpy(bptr, str);
472
473			return bptr;
474			}
475			#endif
476
477			#if 0
478			void
479			snooze_hup(num)
480			int num;
481			{
482			int s, ret;
483			#ifndef NO_UNIX_SOCKETS
484			struct sockaddr_un sock_un;
485			#endif
486			struct sockaddr_in sock_in;
487			char buff[256];
488
489			ret = -1;
490			if (slirp_socket_passwd) {
491			s = socket(AF_INET, SOCK_STREAM, 0);
492			if (s < 0)
493			slirp_exit(1);
494			sock_in.sin_family = AF_INET;
495			sock_in.sin_addr.s_addr = slirp_socket_addr;
496			sock_in.sin_port = htons(slirp_socket_port);
497			if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)
498			slirp_exit(1); /* just exit...*/
499			sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);
500			write(s, buff, strlen(buff)+1);
501			}
502			#ifndef NO_UNIX_SOCKETS
503			else {
504			s = socket(AF_UNIX, SOCK_STREAM, 0);
505			if (s < 0)
506			slirp_exit(1);
507			sock_un.sun_family = AF_UNIX;
508			strcpy(sock_un.sun_path, socket_path);
509			if (connect(s, (struct sockaddr *)&sock_un,
510			sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)
511			slirp_exit(1);
512			sprintf(buff, "kill none:%d", slirp_socket_unit);
513			write(s, buff, strlen(buff)+1);
514			}
515			#endif
516			slirp_exit(0);
517			}
518
519
520			void
521			snooze()
522			{
523			sigset_t s;
524			int i;
525
526			/* Don't need our data anymore */
527			/* XXX This makes SunOS barf */
528			/* brk(0); */
529
530			/* Close all fd's */
531			for (i = 255; i >= 0; i--)
532			close(i);
533
534			signal(SIGQUIT, slirp_exit);
535			signal(SIGHUP, snooze_hup);
536			sigemptyset(&s);
537
538			/* Wait for any signal */
539			sigsuspend(&s);
540
541			/* Just in case ... */
542			exit(255);
543			}
544
545			void
546			relay(s)
547			int s;
548			{
549			char buf[8192];
550			int n;
551			fd_set readfds;
552			struct ttys *ttyp;
553
554			/* Don't need our data anymore */
555			/* XXX This makes SunOS barf */
556			/* brk(0); */
557
558			signal(SIGQUIT, slirp_exit);
559			signal(SIGHUP, slirp_exit);
560			signal(SIGINT, slirp_exit);
561			signal(SIGTERM, slirp_exit);
562
563			/* Fudge to get term_raw and term_restore to work */
564			if (NULL == (ttyp = tty_attach (0, slirp_tty))) {
565			lprint ("Error: tty_attach failed in misc.c:relay()\r\n");
566			slirp_exit (1);
567			}
568			ttyp->fd = 0;
569			ttyp->flags \|= TTY_CTTY;
570			term_raw(ttyp);
571
572			while (1) {
573			FD_ZERO(&readfds);
574
575			FD_SET(0, &readfds);
576			FD_SET(s, &readfds);
577
578			n = select(s+1, &readfds, (fd_set )0, (fd_set )0, (struct timeval *)0);
579
580			if (n <= 0)
581			slirp_exit(0);
582
583			if (FD_ISSET(0, &readfds)) {
584			n = read(0, buf, 8192);
585			if (n <= 0)
586			slirp_exit(0);
587			n = writen(s, buf, n);
588			if (n <= 0)
589			slirp_exit(0);
590			}
591
592			if (FD_ISSET(s, &readfds)) {
593			n = read(s, buf, 8192);
594			if (n <= 0)
595			slirp_exit(0);
596			n = writen(0, buf, n);
597			if (n <= 0)
598			slirp_exit(0);
599			}
600			}
601
602			/* Just in case.... */
603			exit(1);
604			}
605			#endif
606
607			int (lprint_print) _P((void , const char *, va_list));
608			char lprint_ptr, lprint_ptr2, **lprint_arg;
609
610			void
611			#ifdef __STDC__
612			lprint(const char *format, ...)
613			#else
614			lprint(va_alist) va_dcl
615			#endif
616			{
617			va_list args;
618
619			#ifdef __STDC__
620			va_start(args, format);
621			#else
622			char *format;
623			va_start(args);
624			format = va_arg(args, char *);
625			#endif
626			#if 0
627			/* If we're printing to an sbuf, make sure there's enough room */
628			/* XXX +100? */
629			if (lprint_sb) {
630			if ((lprint_ptr - lprint_sb->sb_wptr) >=
631			(lprint_sb->sb_datalen - (strlen(format) + 100))) {
632			int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;
633			int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;
634			int deltap = lprint_ptr - lprint_sb->sb_data;
635
636			lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,
637			lprint_sb->sb_datalen + TCP_SNDSPACE);
638
639			/* Adjust all values */
640			lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;
641			lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;
642			lprint_ptr = lprint_sb->sb_data + deltap;
643
644			lprint_sb->sb_datalen += TCP_SNDSPACE;
645			}
646			}
647			#endif
648			if (lprint_print)
649			lprint_ptr += (lprint_print)(lprint_arg, format, args);
650
651			/* Check if they want output to be logged to file as well */
652			if (lfd) {
653			/*
654			* Remove \r's
655			* otherwise you'll get ^M all over the file
656			*/
657			int len = strlen(format);
658			char bptr1, bptr2;
659
660			bptr1 = bptr2 = strdup(format);
661
662			while (len--) {
663			if (*bptr1 == '\r')
664			memcpy(bptr1, bptr1+1, len+1);
665			else
666			bptr1++;
667			}
668			vfprintf(lfd, bptr2, args);
669			free(bptr2);
670			}
671			va_end(args);
672			}
673
674			void
675			add_emu(buff)
676			char *buff;
677			{
678			u_int lport, fport;
679			u_int8_t tos = 0, emu = 0;
680			char buff1[256], buff2[256], buff4[128];
681			char *buff3 = buff4;
682			struct emu_t *emup;
683			struct socket *so;
684
685			if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {
686			lprint("Error: Bad arguments\r\n");
687			return;
688			}
689
690			if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {
691			lport = 0;
692			if (sscanf(buff1, "%d", &fport) != 1) {
693			lprint("Error: Bad first argument\r\n");
694			return;
695			}
696			}
697
698			if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {
699			buff3 = 0;
700			if (sscanf(buff2, "%256s", buff1) != 1) {
701			lprint("Error: Bad second argument\r\n");
702			return;
703			}
704			}
705
706			if (buff3) {
707			if (strcmp(buff3, "lowdelay") == 0)
708			tos = IPTOS_LOWDELAY;
709			else if (strcmp(buff3, "throughput") == 0)
710			tos = IPTOS_THROUGHPUT;
711			else {
712			lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");
713			return;
714			}
715			}
716
717			if (strcmp(buff1, "ftp") == 0)
718			emu = EMU_FTP;
719			else if (strcmp(buff1, "irc") == 0)
720			emu = EMU_IRC;
721			else if (strcmp(buff1, "none") == 0)
722			emu = EMU_NONE; /* ie: no emulation */
723			else {
724			lprint("Error: Unknown service\r\n");
725			return;
726			}
727
728			/* First, check that it isn't already emulated */
729			for (emup = tcpemu; emup; emup = emup->next) {
730			if (emup->lport == lport && emup->fport == fport) {
731			lprint("Error: port already emulated\r\n");
732			return;
733			}
734			}
735
736			/* link it */
737			emup = (struct emu_t *)malloc(sizeof (struct emu_t));
738			emup->lport = (u_int16_t)lport;
739			emup->fport = (u_int16_t)fport;
740			emup->tos = tos;
741			emup->emu = emu;
742			emup->next = tcpemu;
743			tcpemu = emup;
744
745			/* And finally, mark all current sessions, if any, as being emulated */
746			for (so = tcb.so_next; so != &tcb; so = so->so_next) {
747			if ((lport && lport == ntohs(so->so_lport)) \|\|
748			(fport && fport == ntohs(so->so_fport))) {
749			if (emu)
750			so->so_emu = emu;
751			if (tos)
752			so->so_iptos = tos;
753			}
754			}
755
756			lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);
757			}
758
759			#ifdef BAD_SPRINTF
760
761			#undef vsprintf
762			#undef sprintf
763
764			/*
765			* Some BSD-derived systems have a sprintf which returns char *
766			*/
767
768			int
769			vsprintf_len(string, format, args)
770			char *string;
771			const char *format;
772			va_list args;
773			{
774			vsprintf(string, format, args);
775			return strlen(string);
776			}
777
778			int
779			#ifdef __STDC__
780			sprintf_len(char string, const char format, ...)
781			#else
782			sprintf_len(va_alist) va_dcl
783			#endif
784			{
785			va_list args;
786			#ifdef __STDC__
787			va_start(args, format);
788			#else
789			char *string;
790			char *format;
791			va_start(args);
792			string = va_arg(args, char *);
793			format = va_arg(args, char *);
794			#endif
795			vsprintf(string, format, args);
796			return strlen(string);
797			}
798
799			#endif
800
801			void
802			u_sleep(usec)
803			int usec;
804			{
805			struct timeval t;
806			fd_set fdset;
807
808			FD_ZERO(&fdset);
809
810			t.tv_sec = 0;
811			t.tv_usec = usec * 1000;
812
813			select(0, &fdset, &fdset, &fdset, &t);
814			}
815
816			/*
817			* Set fd blocking and non-blocking
818			*/
819
820			void
821			fd_nonblock(fd)
822			int fd;
823			{
824			#ifdef FIONBIO
825			int opt = 1;
826
827			ioctlsocket(fd, FIONBIO, &opt);
828			#else
829			int opt;
830
831			opt = fcntl(fd, F_GETFL, 0);
832			opt \|= O_NONBLOCK;
833			fcntl(fd, F_SETFL, opt);
834			#endif
835			}
836
837			void
838			fd_block(fd)
839			int fd;
840			{
841			#ifdef FIONBIO
842			int opt = 0;
843
844			ioctlsocket(fd, FIONBIO, &opt);
845			#else
846			int opt;
847
848			opt = fcntl(fd, F_GETFL, 0);
849			opt &= ~O_NONBLOCK;
850			fcntl(fd, F_SETFL, opt);
851			#endif
852			}
853
854
855			#if 0
856			/*
857			* invoke RSH
858			*/
859			int
860			rsh_exec(so,ns, user, host, args)
861			struct socket *so;
862			struct socket *ns;
863			char *user;
864			char *host;
865			char *args;
866			{
867			int fd[2];
868			int fd0[2];
869			int s;
870			char buff[256];
871
872			DEBUG_CALL("rsh_exec");
873			DEBUG_ARG("so = %lx", (long)so);
874
875			if (pipe(fd)<0) {
876			lprint("Error: pipe failed: %s\n", strerror(errno));
877			return 0;
878			}
879			/* #ifdef HAVE_SOCKETPAIR */
880			#if 1
881			if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {
882			close(fd[0]);
883			close(fd[1]);
884			lprint("Error: openpty failed: %s\n", strerror(errno));
885			return 0;
886			}
887			#else
888			if (slirp_openpty(&fd0[0], &fd0[1]) == -1) {
889			close(fd[0]);
890			close(fd[1]);
891			lprint("Error: openpty failed: %s\n", strerror(errno));
892			return 0;
893			}
894			#endif
895
896			switch(fork()) {
897			case -1:
898			lprint("Error: fork failed: %s\n", strerror(errno));
899			close(fd[0]);
900			close(fd[1]);
901			close(fd0[0]);
902			close(fd0[1]);
903			return 0;
904
905			case 0:
906			close(fd[0]);
907			close(fd0[0]);
908
909			/* Set the DISPLAY */
910			if (x_port >= 0) {
911			#ifdef HAVE_SETENV
912			sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
913			setenv("DISPLAY", buff, 1);
914			#else
915			sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
916			putenv(buff);
917			#endif
918			}
919
920			dup2(fd0[1], 0);
921			dup2(fd0[1], 1);
922			dup2(fd[1], 2);
923			for (s = 3; s <= 255; s++)
924			close(s);
925
926			execlp("rsh","rsh","-l", user, host, args, NULL);
927
928			/* Ooops, failed, let's tell the user why */
929
930			sprintf(buff, "Error: execlp of %s failed: %s\n",
931			"rsh", strerror(errno));
932			write(2, buff, strlen(buff)+1);
933			close(0); close(1); close(2); /* XXX */
934			exit(1);
935
936			default:
937			close(fd[1]);
938			close(fd0[1]);
939			ns->s=fd[0];
940			so->s=fd0[0];
941
942			return 1;
943			}
944			}
945			#endif