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

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

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

inline void
insque(void *a, void *b)
{
        register struct quehead *element = (struct quehead *) a;
        register struct quehead *head = (struct quehead *) b;
        element->qh_link = head->qh_link;
        head->qh_link = (struct quehead *)element;
        element->qh_rlink = (struct quehead *)head;
        ((struct quehead *)(element->qh_link))->qh_rlink
        = (struct quehead *)element;
}

inline void
remque(void *a)
{
  register struct quehead *element = (struct quehead *) a;
  ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
  ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
  element->qh_rlink = NULL;
}

int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
             struct in_addr addr, int port)
{
        struct ex_list *tmp_ptr;

        /* First, check if the port is "bound" */
        for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
                if (port == tmp_ptr->ex_fport &&
                    addr.s_addr == tmp_ptr->ex_addr.s_addr)
                        return -1;
        }

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


#ifdef _WIN32

int
fork_exec(struct socket *so, const char *ex, int do_pty)
{
    /* not implemented */
    return 0;
}

#else

/*
 * XXX This is ugly
 * We create and bind a socket, then fork off to another
 * process, which connects to this socket, after which we
 * exec the wanted program.  If something (strange) happens,
 * the accept() call could block us forever.
 *
 * do_pty = 0   Fork/exec inetd style
 * do_pty = 1   Fork/exec using slirp.telnetd
 * do_ptr = 2   Fork/exec using pty
 */
int
fork_exec(struct socket *so, const char *ex, int do_pty)
{
        int s;
        struct sockaddr_in addr;
        socklen_t addrlen = sizeof(addr);
        int opt;
        const char *argv[256];
        /* don't want to clobber the original */
        char *bptr;
        const char *curarg;
        int c, i, ret;
        pid_t pid;

        DEBUG_CALL("fork_exec");
        DEBUG_ARG("so = %p", so);
        DEBUG_ARG("ex = %p", ex);
        DEBUG_ARG("do_pty = %x", do_pty);

        if (do_pty == 2) {
                return 0;
        } else {
                addr.sin_family = AF_INET;
                addr.sin_port = 0;
                addr.sin_addr.s_addr = INADDR_ANY;

                if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
                    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
                    listen(s, 1) < 0) {
                        error_report("Error: inet socket: %s", strerror(errno));
                        closesocket(s);

                        return 0;
                }
        }

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

         case 0:
                setsid();

                /* Set the DISPLAY */
                getsockname(s, (struct sockaddr *)&addr, &addrlen);
                close(s);
                /*
                 * Connect to the socket
                 * XXX If any of these fail, we're in trouble!
                 */
                s = qemu_socket(AF_INET, SOCK_STREAM, 0);
                addr.sin_addr = loopback_addr;
                do {
                    ret = connect(s, (struct sockaddr *)&addr, addrlen);
                } while (ret < 0 && errno == EINTR);

                dup2(s, 0);
                dup2(s, 1);
                dup2(s, 2);
                for (s = getdtablesize() - 1; s >= 3; s--)
                   close(s);

                i = 0;
                bptr = g_strdup(ex); /* No need to free() this */
                if (do_pty == 1) {
                        /* Setup "slirp.telnetd -x" */
                        argv[i++] = "slirp.telnetd";
                        argv[i++] = "-x";
                        argv[i++] = bptr;
                } else
                   do {
                        /* Change the string into argv[] */
                        curarg = bptr;
                        while (*bptr != ' ' && *bptr != (char)0)
                           bptr++;
                        c = *bptr;
                        *bptr++ = (char)0;
                        argv[i++] = g_strdup(curarg);
                   } while (c);

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

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

         default:
                qemu_add_child_watch(pid);
                /*
                 * XXX this could block us...
                 * XXX Should set a timer here, and if accept() doesn't
                 * return after X seconds, declare it a failure
                 * The only reason this will block forever is if socket()
                 * of connect() fail in the child process
                 */
                do {
                    so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
                } while (so->s < 0 && errno == EINTR);
                closesocket(s);
                socket_set_fast_reuse(so->s);
                opt = 1;
                qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
                qemu_set_nonblock(so->s);

                /* Append the telnet options now */
                if (so->so_m != NULL && do_pty == 1)  {
                        sbappend(so, so->so_m);
                        so->so_m = NULL;
                }

                return 1;
        }
}
#endif

void slirp_connection_info(Slirp *slirp, Monitor *mon)
{
    const char * const tcpstates[] = {
        [TCPS_CLOSED]       = "CLOSED",
        [TCPS_LISTEN]       = "LISTEN",
        [TCPS_SYN_SENT]     = "SYN_SENT",
        [TCPS_SYN_RECEIVED] = "SYN_RCVD",
        [TCPS_ESTABLISHED]  = "ESTABLISHED",
        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
        [TCPS_CLOSING]      = "CLOSING",
        [TCPS_LAST_ACK]     = "LAST_ACK",
        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
        [TCPS_TIME_WAIT]    = "TIME_WAIT",
    };
    struct in_addr dst_addr;
    struct sockaddr_in src;
    socklen_t src_len;
    uint16_t dst_port;
    struct socket *so;
    const char *state;
    char buf[20];

    monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
                        "Dest. Address  Port RecvQ SendQ\n");

    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
        if (so->so_state & SS_HOSTFWD) {
            state = "HOST_FORWARD";
        } else if (so->so_tcpcb) {
            state = tcpstates[so->so_tcpcb->t_state];
        } else {
            state = "NONE";
        }
        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
            src_len = sizeof(src);
            getsockname(so->s, (struct sockaddr *)&src, &src_len);
            dst_addr = so->so_laddr;
            dst_port = so->so_lport;
        } else {
            src.sin_addr = so->so_laddr;
            src.sin_port = so->so_lport;
            dst_addr = so->so_faddr;
            dst_port = so->so_fport;
        }
        snprintf(buf, sizeof(buf), "  TCP[%s]", state);
        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
                       ntohs(src.sin_port));
        monitor_printf(mon, "%15s %5d %5d %5d\n",
                       inet_ntoa(dst_addr), ntohs(dst_port),
                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
    }

    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
        if (so->so_state & SS_HOSTFWD) {
            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
            src_len = sizeof(src);
            getsockname(so->s, (struct sockaddr *)&src, &src_len);
            dst_addr = so->so_laddr;
            dst_port = so->so_lport;
        } else {
            snprintf(buf, sizeof(buf), "  UDP[%d sec]",
                         (so->so_expire - curtime) / 1000);
            src.sin_addr = so->so_laddr;
            src.sin_port = so->so_lport;
            dst_addr = so->so_faddr;
            dst_port = so->so_fport;
        }
        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
                       ntohs(src.sin_port));
        monitor_printf(mon, "%15s %5d %5d %5d\n",
                       inet_ntoa(dst_addr), ntohs(dst_port),
                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
    }

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