LXR qemu/slirp/misc.c

   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#include "qemu/osdep.h"
   9#include "slirp.h"
  10#include "libslirp.h"
  11#include "monitor/monitor.h"
  12#include "qemu/error-report.h"
  13#include "qemu/main-loop.h"
  14
  15#ifdef DEBUG
  16int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
  17#endif
  18
  19inline void
  20insque(void *a, void *b)
  21{
  22        register struct quehead *element = (struct quehead *) a;
  23        register struct quehead *head = (struct quehead *) b;
  24        element->qh_link = head->qh_link;
  25        head->qh_link = (struct quehead *)element;
  26        element->qh_rlink = (struct quehead *)head;
  27        ((struct quehead *)(element->qh_link))->qh_rlink
  28        = (struct quehead *)element;
  29}
  30
  31inline void
  32remque(void *a)
  33{
  34  register struct quehead *element = (struct quehead *) a;
  35  ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
  36  ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
  37  element->qh_rlink = NULL;
  38}
  39
  40int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
  41             struct in_addr addr, int port)
  42{
  43        struct ex_list *tmp_ptr;
  44
  45        /* First, check if the port is "bound" */
  46        for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
  47                if (port == tmp_ptr->ex_fport &&
  48                    addr.s_addr == tmp_ptr->ex_addr.s_addr)
  49                        return -1;
  50        }
  51
  52        tmp_ptr = *ex_ptr;
  53        *ex_ptr = g_new(struct ex_list, 1);
  54        (*ex_ptr)->ex_fport = port;
  55        (*ex_ptr)->ex_addr = addr;
  56        (*ex_ptr)->ex_pty = do_pty;
  57        (*ex_ptr)->ex_exec = (do_pty == 3) ? exec : g_strdup(exec);
  58        (*ex_ptr)->ex_next = tmp_ptr;
  59        return 0;
  60}
  61
  62
  63#ifdef _WIN32
  64
  65int
  66fork_exec(struct socket *so, const char *ex, int do_pty)
  67{
  68    /* not implemented */
  69    return 0;
  70}
  71
  72#else
  73
  74/*
  75 * XXX This is ugly
  76 * We create and bind a socket, then fork off to another
  77 * process, which connects to this socket, after which we
  78 * exec the wanted program.  If something (strange) happens,
  79 * the accept() call could block us forever.
  80 *
  81 * do_pty = 0   Fork/exec inetd style
  82 * do_pty = 1   Fork/exec using slirp.telnetd
  83 * do_ptr = 2   Fork/exec using pty
  84 */
  85int
  86fork_exec(struct socket *so, const char *ex, int do_pty)
  87{
  88        int s;
  89        struct sockaddr_in addr;
  90        socklen_t addrlen = sizeof(addr);
  91        int opt;
  92        const char *argv[256];
  93        /* don't want to clobber the original */
  94        char *bptr;
  95        const char *curarg;
  96        int c, i, ret;
  97        pid_t pid;
  98
  99        DEBUG_CALL("fork_exec");
 100        DEBUG_ARG("so = %p", so);
 101        DEBUG_ARG("ex = %p", ex);
 102        DEBUG_ARG("do_pty = %x", do_pty);
 103
 104        if (do_pty == 2) {
 105                return 0;
 106        } else {
 107                addr.sin_family = AF_INET;
 108                addr.sin_port = 0;
 109                addr.sin_addr.s_addr = INADDR_ANY;
 110
 111                if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
 112                    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
 113                    listen(s, 1) < 0) {
 114                        error_report("Error: inet socket: %s", strerror(errno));
 115                        if (s >= 0) {
 116                            closesocket(s);
 117                        }
 118
 119                        return 0;
 120                }
 121        }
 122
 123        pid = fork();
 124        switch(pid) {
 125         case -1:
 126                error_report("Error: fork failed: %s", strerror(errno));
 127                close(s);
 128                return 0;
 129
 130         case 0:
 131                setsid();
 132
 133                /* Set the DISPLAY */
 134                getsockname(s, (struct sockaddr *)&addr, &addrlen);
 135                close(s);
 136                /*
 137                 * Connect to the socket
 138                 * XXX If any of these fail, we're in trouble!
 139                 */
 140                s = qemu_socket(AF_INET, SOCK_STREAM, 0);
 141                addr.sin_addr = loopback_addr;
 142                do {
 143                    ret = connect(s, (struct sockaddr *)&addr, addrlen);
 144                } while (ret < 0 && errno == EINTR);
 145
 146                dup2(s, 0);
 147                dup2(s, 1);
 148                dup2(s, 2);
 149                for (s = getdtablesize() - 1; s >= 3; s--)
 150                   close(s);
 151
 152                i = 0;
 153                bptr = g_strdup(ex); /* No need to free() this */
 154                if (do_pty == 1) {
 155                        /* Setup "slirp.telnetd -x" */
 156                        argv[i++] = "slirp.telnetd";
 157                        argv[i++] = "-x";
 158                        argv[i++] = bptr;
 159                } else
 160                   do {
 161                        /* Change the string into argv[] */
 162                        curarg = bptr;
 163                        while (*bptr != ' ' && *bptr != (char)0)
 164                           bptr++;
 165                        c = *bptr;
 166                        *bptr++ = (char)0;
 167                        argv[i++] = g_strdup(curarg);
 168                   } while (c);
 169
 170                argv[i] = NULL;
 171                execvp(argv[0], (char **)argv);
 172
 173                /* Ooops, failed, let's tell the user why */
 174        fprintf(stderr, "Error: execvp of %s failed: %s\n",
 175                argv[0], strerror(errno));
 176                close(0); close(1); close(2); /* XXX */
 177                exit(1);
 178
 179         default:
 180                qemu_add_child_watch(pid);
 181                /*
 182                 * XXX this could block us...
 183                 * XXX Should set a timer here, and if accept() doesn't
 184                 * return after X seconds, declare it a failure
 185                 * The only reason this will block forever is if socket()
 186                 * of connect() fail in the child process
 187                 */
 188                do {
 189                    so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 190                } while (so->s < 0 && errno == EINTR);
 191                closesocket(s);
 192                socket_set_fast_reuse(so->s);
 193                opt = 1;
 194                qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
 195                qemu_set_nonblock(so->s);
 196
 197                /* Append the telnet options now */
 198                if (so->so_m != NULL && do_pty == 1)  {
 199                        sbappend(so, so->so_m);
 200                        so->so_m = NULL;
 201                }
 202
 203                return 1;
 204        }
 205}
 206#endif
 207
 208void slirp_connection_info(Slirp *slirp, Monitor *mon)
 209{
 210    const char * const tcpstates[] = {
 211        [TCPS_CLOSED]       = "CLOSED",
 212        [TCPS_LISTEN]       = "LISTEN",
 213        [TCPS_SYN_SENT]     = "SYN_SENT",
 214        [TCPS_SYN_RECEIVED] = "SYN_RCVD",
 215        [TCPS_ESTABLISHED]  = "ESTABLISHED",
 216        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
 217        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
 218        [TCPS_CLOSING]      = "CLOSING",
 219        [TCPS_LAST_ACK]     = "LAST_ACK",
 220        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
 221        [TCPS_TIME_WAIT]    = "TIME_WAIT",
 222    };
 223    struct in_addr dst_addr;
 224    struct sockaddr_in src;
 225    socklen_t src_len;
 226    uint16_t dst_port;
 227    struct socket *so;
 228    const char *state;
 229    char buf[20];
 230
 231    monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
 232                        "Dest. Address  Port RecvQ SendQ\n");
 233
 234    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
 235        if (so->so_state & SS_HOSTFWD) {
 236            state = "HOST_FORWARD";
 237        } else if (so->so_tcpcb) {
 238            state = tcpstates[so->so_tcpcb->t_state];
 239        } else {
 240            state = "NONE";
 241        }
 242        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
 243            src_len = sizeof(src);
 244            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 245            dst_addr = so->so_laddr;
 246            dst_port = so->so_lport;
 247        } else {
 248            src.sin_addr = so->so_laddr;
 249            src.sin_port = so->so_lport;
 250            dst_addr = so->so_faddr;
 251            dst_port = so->so_fport;
 252        }
 253        snprintf(buf, sizeof(buf), "  TCP[%s]", state);
 254        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 255                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 256                       ntohs(src.sin_port));
 257        monitor_printf(mon, "%15s %5d %5d %5d\n",
 258                       inet_ntoa(dst_addr), ntohs(dst_port),
 259                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 260    }
 261
 262    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
 263        if (so->so_state & SS_HOSTFWD) {
 264            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
 265            src_len = sizeof(src);
 266            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 267            dst_addr = so->so_laddr;
 268            dst_port = so->so_lport;
 269        } else {
 270            snprintf(buf, sizeof(buf), "  UDP[%d sec]",
 271                         (so->so_expire - curtime) / 1000);
 272            src.sin_addr = so->so_laddr;
 273            src.sin_port = so->so_lport;
 274            dst_addr = so->so_faddr;
 275            dst_port = so->so_fport;
 276        }
 277        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 278                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 279                       ntohs(src.sin_port));
 280        monitor_printf(mon, "%15s %5d %5d %5d\n",
 281                       inet_ntoa(dst_addr), ntohs(dst_port),
 282                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 283    }
 284
 285    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
 286        snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
 287                     (so->so_expire - curtime) / 1000);
 288        src.sin_addr = so->so_laddr;
 289        dst_addr = so->so_faddr;
 290        monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,
 291                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
 292        monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
 293                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 294    }
 295}
 296