Archipelago » qemu

/*

 * Copyright (c) 1995 Danny Gasparovski.

 *

 * Please read the file COPYRIGHT for the

 * terms and conditions of the copyright.

 */

#include <slirp.h>

#include <libslirp.h>

#include "monitor/monitor.h"

#include "qemu/main-loop.h"

#ifdef DEBUG

int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;

#endif

struct quehead {

        struct quehead *qh_link;

        struct quehead *qh_rlink;

};

inline void

insque(void *a, void *b)

{

        register struct quehead *element = (struct quehead *) a;

        register struct quehead *head = (struct quehead *) b;

        element->qh_link = head->qh_link;

        head->qh_link = (struct quehead *)element;

        element->qh_rlink = (struct quehead *)head;

        ((struct quehead *)(element->qh_link))->qh_rlink

        = (struct quehead *)element;

}

inline void

remque(void *a)

{

  register struct quehead *element = (struct quehead *) a;

  ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;

  ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;

  element->qh_rlink = NULL;

}

int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,

             struct in_addr addr, int port)

{

        struct ex_list *tmp_ptr;

        /* First, check if the port is "bound" */

        for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {

                if (port == tmp_ptr->ex_fport &&

                    addr.s_addr == tmp_ptr->ex_addr.s_addr)

                        return -1;

        }

        tmp_ptr = *ex_ptr;

        *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));

        (*ex_ptr)->ex_fport = port;

        (*ex_ptr)->ex_addr = addr;

        (*ex_ptr)->ex_pty = do_pty;

        (*ex_ptr)->ex_exec = (do_pty == 3) ? exec : strdup(exec);

        (*ex_ptr)->ex_next = tmp_ptr;

        return 0;

}

#ifndef HAVE_STRERROR

/*

 * For systems with no strerror

 */

extern int sys_nerr;

extern char *sys_errlist[];

char *

strerror(error)

        int error;

{

        if (error < sys_nerr)

           return sys_errlist[error];

        else

           return "Unknown error.";

}

#endif

#ifdef _WIN32

int

fork_exec(struct socket *so, const char *ex, int do_pty)

{

    /* not implemented */

    return 0;

}

#else

/*

 * XXX This is ugly

 * We create and bind a socket, then fork off to another

 * process, which connects to this socket, after which we

 * exec the wanted program.  If something (strange) happens,

 * the accept() call could block us forever.

 *

 * do_pty = 0   Fork/exec inetd style

 * do_pty = 1   Fork/exec using slirp.telnetd

 * do_ptr = 2   Fork/exec using pty

 */

int

fork_exec(struct socket *so, const char *ex, int do_pty)

{

        int s;

        struct sockaddr_in addr;

        socklen_t addrlen = sizeof(addr);

        int opt;

        const char *argv[256];

        /* don't want to clobber the original */

        char *bptr;

        const char *curarg;

        int c, i, ret;

        pid_t pid;

        DEBUG_CALL("fork_exec");

        DEBUG_ARG("so = %lx", (long)so);

        DEBUG_ARG("ex = %lx", (long)ex);

        DEBUG_ARG("do_pty = %lx", (long)do_pty);

        if (do_pty == 2) {

                return 0;

        } else {

                addr.sin_family = AF_INET;

                addr.sin_port = 0;

                addr.sin_addr.s_addr = INADDR_ANY;

                if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||

                    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||

                    listen(s, 1) < 0) {

                        lprint("Error: inet socket: %s\n", strerror(errno));

                        closesocket(s);

                        return 0;

                }

        }

        pid = fork();

        switch(pid) {

         case -1:

                lprint("Error: fork failed: %s\n", strerror(errno));

                close(s);

                return 0;

         case 0:

                setsid();

                /* Set the DISPLAY */

                getsockname(s, (struct sockaddr *)&addr, &addrlen);

                close(s);

                /*

                 * Connect to the socket

                 * XXX If any of these fail, we're in trouble!

                 */

                s = qemu_socket(AF_INET, SOCK_STREAM, 0);

                addr.sin_addr = loopback_addr;

                do {

                    ret = connect(s, (struct sockaddr *)&addr, addrlen);

                } while (ret < 0 && errno == EINTR);

                dup2(s, 0);

                dup2(s, 1);

                dup2(s, 2);

                for (s = getdtablesize() - 1; s >= 3; s--)

                   close(s);

                i = 0;

                bptr = g_strdup(ex); /* No need to free() this */

                if (do_pty == 1) {

                        /* Setup "slirp.telnetd -x" */

                        argv[i++] = "slirp.telnetd";

                        argv[i++] = "-x";

                        argv[i++] = bptr;

                } else

                   do {

                        /* Change the string into argv[] */

                        curarg = bptr;

                        while (*bptr != ' ' && *bptr != (char)0)

                           bptr++;

                        c = *bptr;

                        *bptr++ = (char)0;

                        argv[i++] = strdup(curarg);

                   } while (c);

                argv[i] = NULL;

                execvp(argv[0], (char **)argv);

                /* Ooops, failed, let's tell the user why */

        fprintf(stderr, "Error: execvp of %s failed: %s\n",

                argv[0], strerror(errno));

                close(0); close(1); close(2); /* XXX */

                exit(1);

         default:

                qemu_add_child_watch(pid);

                /*

                 * XXX this could block us...

                 * XXX Should set a timer here, and if accept() doesn't

                 * return after X seconds, declare it a failure

                 * The only reason this will block forever is if socket()

                 * of connect() fail in the child process

                 */

                do {

                    so->s = accept(s, (struct sockaddr *)&addr, &addrlen);

                } while (so->s < 0 && errno == EINTR);

                closesocket(s);

                opt = 1;

                qemu_setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(int));

                opt = 1;

                qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));

                qemu_set_nonblock(so->s);

                /* Append the telnet options now */

                if (so->so_m != NULL && do_pty == 1)  {

                        sbappend(so, so->so_m);

                        so->so_m = NULL;

                }

                return 1;

        }

}

#endif

#ifndef HAVE_STRDUP

char *

strdup(str)

        const char *str;

{

        char *bptr;

        bptr = (char *)malloc(strlen(str)+1);

        strcpy(bptr, str);

        return bptr;

}

#endif

void lprint(const char *format, ...)

{

    va_list args;

    va_start(args, format);

    monitor_vprintf(default_mon, format, args);

    va_end(args);

}

void slirp_connection_info(Slirp *slirp, Monitor *mon)

{

    const char * const tcpstates[] = {

        [TCPS_CLOSED]       = "CLOSED",

        [TCPS_LISTEN]       = "LISTEN",

        [TCPS_SYN_SENT]     = "SYN_SENT",

        [TCPS_SYN_RECEIVED] = "SYN_RCVD",

        [TCPS_ESTABLISHED]  = "ESTABLISHED",

        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",

        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",

        [TCPS_CLOSING]      = "CLOSING",

        [TCPS_LAST_ACK]     = "LAST_ACK",

        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",

        [TCPS_TIME_WAIT]    = "TIME_WAIT",

    };

    struct in_addr dst_addr;

    struct sockaddr_in src;

    socklen_t src_len;

    uint16_t dst_port;

    struct socket *so;

    const char *state;

    char buf[20];

    monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "

                        "Dest. Address  Port RecvQ SendQ\n");

    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {

        if (so->so_state & SS_HOSTFWD) {

            state = "HOST_FORWARD";

        } else if (so->so_tcpcb) {

            state = tcpstates[so->so_tcpcb->t_state];

        } else {

            state = "NONE";

        }

        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {

            src_len = sizeof(src);

            getsockname(so->s, (struct sockaddr *)&src, &src_len);

            dst_addr = so->so_laddr;

            dst_port = so->so_lport;

        } else {

            src.sin_addr = so->so_laddr;

            src.sin_port = so->so_lport;

            dst_addr = so->so_faddr;

            dst_port = so->so_fport;

        }

        snprintf(buf, sizeof(buf), "  TCP[%s]", state);

        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,

                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",

                       ntohs(src.sin_port));

        monitor_printf(mon, "%15s %5d %5d %5d\n",

                       inet_ntoa(dst_addr), ntohs(dst_port),

                       so->so_rcv.sb_cc, so->so_snd.sb_cc);

    }

    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {

        if (so->so_state & SS_HOSTFWD) {

            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");

            src_len = sizeof(src);

            getsockname(so->s, (struct sockaddr *)&src, &src_len);

            dst_addr = so->so_laddr;

            dst_port = so->so_lport;

        } else {

            snprintf(buf, sizeof(buf), "  UDP[%d sec]",

                         (so->so_expire - curtime) / 1000);

            src.sin_addr = so->so_laddr;

            src.sin_port = so->so_lport;

            dst_addr = so->so_faddr;

            dst_port = so->so_fport;

        }

        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,

                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",

                       ntohs(src.sin_port));

        monitor_printf(mon, "%15s %5d %5d %5d\n",

                       inet_ntoa(dst_addr), ntohs(dst_port),

                       so->so_rcv.sb_cc, so->so_snd.sb_cc);

    }

    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {

        snprintf(buf, sizeof(buf), "  ICMP[%d sec]",

                     (so->so_expire - curtime) / 1000);

        src.sin_addr = so->so_laddr;

        dst_addr = so->so_faddr;

        monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,

                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");

        monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),

                       so->so_rcv.sb_cc, so->so_snd.sb_cc);

    }

}